WO2024174958A1

WO2024174958A1 - Charge pump circuit and electronic device

Info

Publication number: WO2024174958A1
Application number: PCT/CN2024/077538
Authority: WO
Inventors: 王建
Original assignee: 维沃移动通信有限公司
Priority date: 2023-02-24
Filing date: 2024-02-19
Publication date: 2024-08-29
Also published as: CN116191870A

Abstract

Disclosed in the present application are a charge pump circuit and an electronic device. The charge pump circuit comprises an energy storage unit, a control unit, and a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch, all of which are controlled by the control unit. The first switch, the second switch and the third switch are successively connected in series. A common end of the first switch and the second switch serves as a voltage output end of the charge pump circuit for first-stage voltage regulation. The fourth switch, the sixth switch and the fifth switch are connected in series between a voltage input end of the charge pump circuit and a voltage output end of the charge pump circuit for second-stage voltage regulation. A first end of the energy storage unit is connected between the first switch and the second switch, and a second end of the energy storage unit is connected to a common end of the third switch, the fourth switch and the sixth switch. A first end of the seventh switch is connected between the first switch and the second switch, and a second end of the seventh switch is connected between the fifth switch and the sixth switch.

Description

Charge Pump Circuits and Electronics

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese patent application 202310174792.3, filed on February 24, 2023, entitled “Charge Pump Circuit and Electronic Device,” the entire contents of which are incorporated herein by reference.

Technical Field

The present application belongs to the field of power electronics technology, and specifically relates to a charge pump circuit and an electronic device.

Background Art

With the development of science and technology, mobile phones and other electronic devices have been used more and more widely. At present, mobile phones and other electronic devices generally use charge pump circuits to achieve DC-DC voltage conversion.

When using a charge pump circuit to achieve DC-DC voltage conversion, it is usually only possible to achieve buck-boost once, that is, to adjust the DC voltage to half or twice the input voltage. For example, a charge pump circuit can be used to convert a 16V DC voltage to an 8V DC voltage, or to convert an 8V DC voltage to a 16V DC voltage.

If two voltage steps are required, two charge pump circuits are required to perform voltage regulation in sequence. Specifically, charge pump circuit A is required to perform the first voltage regulation first, and then charge pump circuit B is required to perform the second voltage regulation. Since two charge pump circuits are required to achieve two voltage steps, the cost is relatively high.

Summary of the invention

The present application aims to provide a charge pump circuit and an electronic device, thereby providing a charge pump circuit supporting two-stage voltage regulation.

In a first aspect, an embodiment of the present application provides a charge pump circuit, including a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an energy storage unit element and control unit;

The first switch, the second switch and the third switch are connected in series in sequence, and the common end of the second switch and the third switch serves as the voltage output end of the primary voltage regulation of the charge pump circuit;

The fourth switch, the sixth switch and the fifth switch are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulation of the charge pump circuit;

The first end of the energy storage unit is connected between the first switch and the second switch, and the second end of the energy storage unit is connected to the common end of the third switch, the fourth switch and the sixth switch;

A first end of the seventh switch is connected between the first switch and the second switch, and a second end of the seventh switch is connected between the fifth switch and the sixth switch;

The control end of the first switch, the control end of the second switch, the control end of the third switch, the control end of the fourth switch, the control end of the fifth switch, the control end of the sixth switch and the control end of the seventh switch are connected to the control unit.

In a second aspect, an embodiment of the present application provides a charge pump circuit, including a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch and an energy storage unit;

A first end of the first switch is connected to the first ground terminal and the negative electrode of the battery, and a second end of the first switch is connected to a first end of the second switch;

The second end of the second switch is electrically connected to the first end of the third switch, and the node where the second end of the second switch and the first end of the third switch are connected serves as a voltage output end of a primary voltage regulator of the charge pump circuit, and the voltage output end of the primary voltage regulator of the charge pump circuit is connected to the positive electrode of the battery;

The second end of the third switch is connected to the first end of the fourth switch and the second end of the sixth switch, and the first end of the sixth switch is connected to the second end of the fifth switch;

A first end of the seventh switch is connected to the second end of the first switch and the first end of the second switch, and a second end of the seventh switch is connected to the second end of the fifth switch and the first end of the sixth switch;

The first end of the energy storage unit is connected to the second end of the first switch and the first end of the second switch, and the second end of the energy storage unit is connected to the second end of the third switch, the first end of the fourth switch and the second end of the sixth switch;

a control end of the first switch, a control end of the second switch, a control end of the third switch, a control end of the fourth switch, a control end of the fifth switch, a control end of the sixth switch, and a control end of the seventh switch Access control signals respectively;

When the charge pump circuit is in the step-down mode, the second end of the fourth switch is the voltage input end of the charge pump circuit, and the first end of the fifth switch is the voltage output end of the secondary voltage regulation of the charge pump circuit;

When the charge pump circuit is in the boost mode, the second end of the fourth switch is the voltage output end of the secondary voltage regulation of the charge pump circuit, and the first end of the fifth switch is the voltage input end of the charge pump circuit.

In a third aspect, an embodiment of the present application provides an electronic device, which includes a charge pump circuit as described in the first aspect or the second aspect above.

In an embodiment of the present application, a charge pump circuit includes an energy storage unit, a control unit, and a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch, all of which are controlled by the control unit; wherein the first switch, the second switch, and the third switch are connected in series in sequence, and the common end of the second switch and the third switch serves as the voltage output end of the primary voltage regulation of the charge pump circuit; the fourth switch, the sixth switch, and the fifth switch are connected in series between the voltage input end of the charge pump circuit and the voltage output end of the secondary voltage regulation of the charge pump circuit; the first end of the energy storage unit is connected between the first switch and the second switch, and the second end of the energy storage unit is connected to the common end of the third switch, the fourth switch, and the sixth switch; the first end of the seventh switch is connected between the first switch and the second switch, and the second end of the seventh switch is connected between the fifth switch and the sixth switch. Therefore, by multiplexing the first switch, the third switch, the energy storage unit and the voltage output end of the primary voltage regulation, the voltage output end of the primary voltage regulation can be used as the voltage input end of the secondary voltage regulation, and with the flexible control of the first switch to the seventh switch, the energy storage unit can flexibly participate in the primary and secondary voltage regulation, and realize the step-up and step-down voltage regulation control under different conditions, so that the voltage signal input to the voltage input end of the charge pump circuit can be transformed and finally output as four times or one-quarter of the original input voltage signal, realizing the secondary voltage regulation output. Therefore, the secondary voltage regulation control and output are realized with the help of a single charge pump circuit, reducing the cost of circuit components.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present application are described in conjunction with the following drawings. will become obvious and easy to understand, among which:

FIG1 is a schematic diagram of a circuit structure of a related technology related to a charge pump circuit according to an embodiment of the present application;

2 is a schematic diagram of a circuit module structure when performing secondary voltage regulation according to the relevant technology involved in the charge pump circuit of an embodiment of the present application;

FIG3 is a schematic diagram of an optional circuit structure of a charge pump circuit according to an embodiment of the present application;

4 is a schematic diagram of a circuit structure when the charge pump circuit according to an embodiment of the present application is in a buck mode;

5 is a schematic diagram of a circuit structure when the charge pump circuit according to an embodiment of the present application is in a boost mode;

6 is a schematic diagram of the circuit operation of the charge pump circuit in the first period when performing a first-stage voltage reduction according to an embodiment of the present application;

7 is a schematic diagram of the circuit operation of the charge pump circuit in the second period when performing a first-stage voltage reduction according to an embodiment of the present application;

8 is a schematic diagram of the circuit operation of the charge pump circuit in the third period when performing secondary voltage reduction according to an embodiment of the present application;

9 is a schematic diagram of the circuit operation of the charge pump circuit in the fourth period when performing secondary voltage reduction according to an embodiment of the present application;

10 is a schematic diagram of the circuit operation of the charge pump circuit in the fifth period when performing a first-stage boost according to an embodiment of the present application;

11 is a schematic diagram of the circuit operation of the charge pump circuit in the sixth period when performing a first-stage boost according to an embodiment of the present application;

12 is a schematic diagram of the circuit operation of the charge pump circuit in the seventh period when performing secondary boosting according to an embodiment of the present application;

FIG. 13 is a schematic diagram of the circuit operation of the charge pump circuit in the eighth period when performing a two-stage boost according to an embodiment of the present application.

Reference numerals:
A control unit 10;
A first switch S1; a second switch S2; a third switch S3; a fourth switch S4; and a fifth switch S5;
Sixth switch S6; seventh switch S7; energy storage unit Cfly; battery B.

DETAILED DESCRIPTION

The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the objects connected before and after are in an "or" relationship.

In the description of the present application, it should be understood that the terms "center", "depth", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

Please refer to FIG. 1, which shows a schematic diagram of an optional circuit structure of a charge pump circuit in the related art, which uses the coordination between the energy storage capacitor and four switch tubes to achieve voltage adjustment, and has the advantages of high efficiency, low ripple, low noise and low cost. As a result, the charge pump converter is widely used in electronic devices such as mobile phones and tablet computers.

The current charge pump circuit can only achieve one-stage conversion, that is, after adjustment by the charge pump circuit, the voltage is adjusted to twice or half the input voltage. However, in some implementation scenarios, it is necessary to achieve two-stage voltage conversion, that is, to adjust the voltage to one-quarter or four times the input voltage. In this case, you can refer to Figure 2 for settings, that is, use two charge pump circuits for voltage conversion. Therefore, when implementing two-stage voltage conversion, 8 switching tubes and 2 energy storage capacitors are used. There are many devices and the circuit is The circuit components cost is high.

In order to solve the above technical problems, an embodiment of the present application provides a charge pump circuit and an electronic device. The charge pump circuit provided by the embodiment of the present application is first described below.

Please refer to Fig. 3, which shows an optional structural schematic diagram of a charge pump circuit of an embodiment of the present application. The charge pump circuit may include a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, an energy storage unit Cfly and a control unit 10.

The first switch S1 to the seventh switch S7 may be a metal-oxide-semiconductor field-effect transistor (MOSFET). For example, the first switch S1 to the seventh switch S7 may be an N-type MOSFET. In other examples, the first switch S1 to the seventh switch S7 may also be other types of switch tubes, such as a P-type MOSFET.

The energy storage unit Cfly can be used to store and release electric energy. For example, the energy storage unit Cfly can be an energy storage capacitor. The control unit 10 can be a drive chip or a drive circuit composed of discrete components.

The first switch S1, the second switch S2 and the third switch S3 are connected in series in sequence, and the common end of the second switch S2 and the third switch S3 serves as the voltage output end of the primary voltage regulation of the charge pump circuit.

Exemplarily, the first end of the first switch S1 can be connected to the first ground terminal, the second end of the first switch S1 can be connected to the first end of the second switch S2, and the second end of the second switch S2 is connected to the first end of the third switch S3. The node where the second end of the second switch S2 is connected to the first end of the third switch S3 can be used as the voltage output end of the first-stage voltage regulation of the charge pump circuit. The voltage output end of the first-stage voltage regulation can also be connected to the battery B of the electronic device.

The fourth switch S4, the sixth switch S6 and the fifth switch S5 are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

Exemplarily, the fourth switch S4, the sixth switch S6 and the fifth switch S5 may be connected in series in sequence.

In an embodiment, the charge pump circuit as a DC-DC converter may have a high voltage side and a low voltage side. It should be noted that when a voltage signal is connected to the high voltage side, the charge pump circuit can realize a step-down conversion; when a voltage signal is connected to the low voltage side, the charge pump circuit can realize a step-up conversion.

Please refer to Figure 3 and Figure 4 together. When the step-down conversion is performed, that is, the charge pump circuit is in the step-down mode, the second end of the fourth switch S4 is the voltage input end of the charge pump circuit, and the first end of the fifth switch S5 is the voltage output end of the secondary voltage regulation of the charge pump circuit.

Please refer to Figure 3 and Figure 5 together. When performing a boost conversion, that is, the charge pump circuit is in the boost mode, the first end of the fifth switch S5 is the voltage input end of the charge pump circuit, and the second end of the fourth switch S4 is the voltage output end of the secondary voltage regulation of the charge pump circuit.

Exemplarily, the first end of the fifth switch S5 can be used as the low-voltage side of the charge pump circuit, the second end of the fifth switch S5 can be connected to the first end of the sixth switch S6, the second end of the sixth switch S6 can be connected to the first end of the fourth switch S4, and the second end of the fourth switch S4 can be used as the high-voltage side of the charge pump circuit.

Please continue to refer to FIG. 3 , a first end of the energy storage unit Cfly may be connected between the first switch S1 and the second switch S2 , and a second end of the energy storage unit Cfly may be electrically connected to a common end of the third switch S3 , the fourth switch S4 , and the sixth switch S6 .

A first end of the seventh switch S7 may be connected between the first switch S1 and the second switch S2 , and a second end of the seventh switch S7 may be connected between the fifth switch S5 and the sixth switch S6 .

Control ends of the first switch S1 , the second switch S2 , the third switch S3 , the fourth switch S4 , the fifth switch S5 , the sixth switch S6 and the seventh switch S7 are connected to the control unit 10 .

The control ends of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6 and the seventh switch S7 may be controlled by control signals respectively.

It should also be noted that, taking the first switch S1 to the seventh switch S7 as an N-type MOSFET for example, the first ends of the first switch S1 to the seventh switch S7 can all be sources, the first switches S1 to the seventh switch S7 can all be drains, and the control ends of the first switches S1 to the seventh switch S7 can be gates.

The embodiment of the present application is based on the charge pump circuit in the related art, and adds a fifth switch S5, a sixth switch S6 and a seventh switch S7 and a charge and discharge branch related to the fifth switch S5 to the seventh switch S7 in a charge pump circuit, so that the first switch S1, the third switch S3, the energy storage unit Cfly and the voltage output end of the first voltage regulation can be reused when implementing the voltage regulation control. S1, the second switch S2, the third switch S3, the fourth switch S4, the energy storage unit Cfly and the voltage output end of the first voltage regulation constitute the first voltage regulation module, and the first switch S1, the third switch S3, the fifth switch S5, the sixth switch S6, the seventh switch S7, the energy storage unit Cfly and the voltage output end of the first voltage regulation constitute the second voltage regulation module, so that when performing voltage regulation transformation, the voltage output end of the first voltage regulation can be used as the voltage input end of the second voltage regulation, and cooperate with the flexible control of the first switch S1 to the seventh switch S7, so that the energy storage unit Cfly can flexibly participate in the first and second voltage regulation, and realize the step-up and step-down voltage regulation control under different circumstances. Finally, the voltage signal input to the voltage input end of the charge pump circuit can be transformed and output as four times or one-quarter of the original input voltage signal, realizing the second voltage regulation output. Therefore, the second voltage regulation control and output are realized in a single charge pump circuit, and compared with the solution of using two charge pump circuits in the related art, one switch and one capacitor are reduced, and the cost of circuit components is reduced.

Please continue to refer to Figures 3 and 4. In some optional examples, the charge pump circuit may further include a battery B, and the voltage output terminal of the primary voltage regulator of the charge pump circuit may be connected to the positive electrode of the battery B. The first terminal of the first switch S1 is connected to the negative electrode of the battery B, and the second terminal of the first switch S1 is connected to the second switch S2.

When the charge pump circuit is in the buck mode, the fourth switch S4 is connected to the voltage input terminal of the charge pump circuit, the fifth switch S5 is connected to the voltage output terminal of the secondary voltage regulation of the charge pump circuit, and the sixth switch S6 is connected in series between the fourth switch S4 and the fifth switch S5.

In this example, by setting a battery B in the charge pump circuit and connecting the voltage output terminal of the first-stage voltage regulation to the battery B, the DC voltage input to the voltage input terminal of the charge pump circuit connected to the fourth switch S4 can be stepped down by one stage when the charge pump circuit is in the step-down mode. The DC power after the first-stage step-down is output to the battery B via the voltage output terminal of the first-stage voltage regulation of the charge pump circuit. At this time, the DC voltage received by the battery B is half of the input voltage.

Subsequently, the voltage of battery B is reused to reuse battery B in the secondary voltage regulation circuit, and the voltage output end of the primary voltage regulation of the charge pump circuit is used as the voltage input end of the secondary voltage reduction. After the secondary voltage reduction, the voltage output end of the secondary voltage regulation of the charge pump circuit connected to the fifth switch S5 finally outputs a voltage that is one quarter of the original input DC voltage.

3 and 5, when the charge pump circuit is in the boost mode, the fourth switch S4 is connected to the voltage output terminal of the secondary voltage regulator of the charge pump circuit, and the fifth switch S5 is connected to the charge pump circuit. The voltage input end of the circuit is connected, and the sixth switch S6 is connected in series between the fourth switch S4 and the fifth switch S5.

In this example, by setting a battery B in the charge pump circuit and connecting the voltage output terminal of the first-stage voltage regulation to the battery B, the DC voltage connected to the voltage input terminal of the charge pump circuit connected to the fifth switch S5 can be boosted by the first stage when the charge pump circuit is in the boost mode. The voltage output terminal of the first-stage voltage regulation of the charge pump circuit can output DC power after the first-stage boost to the battery B. At this time, the voltage of the battery B is twice the input voltage.

Subsequently, the voltage of battery B is reused to reuse battery B in the secondary voltage regulation circuit, and the voltage output end of the primary voltage regulation of the charge pump circuit is used as the voltage input end of the secondary voltage boost. After the secondary voltage boost, the voltage output end of the secondary voltage regulation of the charge pump circuit finally connected to the fourth switch S4 outputs a voltage that is four times the DC voltage.

In these examples, the voltage output terminal of the first-stage voltage regulation and the battery B connected thereto can be flexibly reused when the charge pump circuit is in different voltage regulation modes, thereby realizing the second-stage voltage regulation control and output in a single charge pump circuit.

Please refer to FIG. 3 to FIG. 4 , as well as FIG. 6 and FIG. 7 . In some optional examples, when the charge pump circuit is in the first buck mode, the control unit 10 may control the fifth switch S5 , the sixth switch S6 and the seventh switch S7 to be turned off.

The control unit 10 may also control the second switch S2 and the fourth switch S4 to be turned on and the first switch S1 and the third switch S3 to be turned off in the first period, and control the first switch S1 and the third switch S3 to be turned on and the second switch S2 and the fourth switch S4 to be turned off in the second period.

It should be noted that the first step-down mode may refer to a mode in which the charge pump circuit inputs a voltage from the high-voltage side and outputs a stepped-down voltage to the battery B through the voltage output terminal of the first-stage voltage regulation of the charge pump circuit. The duration of the first time period and the duration of the second time period may be the same or similar.

In this example, the fifth switch S5, the sixth switch S6 and the seventh switch S7 can be controlled to be in a normally off state in the first buck mode. When the charge pump circuit works in this mode, it can be divided into two processing periods, in which the first switch S1, the third switch S3, the second switch S2 and the fourth switch S4 are alternately turned on.

For example, the first switch S1 and the third switch S3 are activated by the enable signal of the control unit 10 in a switch control cycle when the control unit 10 controls the charge pump circuit to perform a first-stage voltage reduction. The duration is consistent with or similar to the duration of the enable signal of the control unit 10 for the second switch S2 and the fourth switch S4.

Please refer to FIG6. In the first time period, which is the first half of a switch control cycle of the first-stage voltage reduction, the second switch S2 and the fourth switch S4 are turned on, and the first switch S1, the third switch S3, the fifth switch S5, the sixth switch S6 and the seventh switch S7 are turned off. At this time, the input source is connected to the side of the charge pump circuit close to the fourth switch S4, and the input source supplies power to the battery B connected to the voltage output end of the first-stage voltage regulation of the energy storage unit Cfly and the charge pump circuit. In this stage, there is a voltage relationship of the following formula (1).
V _in =V _c +V _bat (1)

Wherein, _Vin is the input source voltage, _Vc is the voltage across the energy storage unit Cfly, and _Vbat is the voltage across the battery B.

Please refer to Figure 7. In the second period, which is the second half of a switch control cycle of the first-stage voltage reduction, the second switch S2 and the fourth switch S4 are turned off, the first switch S1 and the third switch S3 are turned on, and the fifth switch S5, the sixth switch S6 and the seventh switch S7 are still turned off. At this time, the energy storage unit Cfly supplies power to the load; at this stage, the voltage relationship of the following formula (2) exists.
V _c =V _bat (2)

According to the above equations (1) and (2), when the charge pump circuit performs a step-down process, the relationship between the input voltage and the output voltage of the voltage output terminal of the first-stage voltage regulation is shown in the following equation (3). Thus, the first-stage step-down conversion is realized.
V _bat =V _in /2 (3)

In these embodiments, the battery B connected to the voltage output terminal of the first-stage voltage regulation is charged by the first-stage voltage reduction of the charge pump circuit, thereby realizing a first-stage voltage reduction conversion.

In some optional examples, please continue to refer to Figure 3, the charge pump circuit may be in the first step-down mode when the voltage input end is the high voltage side of the charge pump circuit and the high voltage side switches from a state where there is no voltage signal to a state where there is a voltage signal.

Take the charge pump circuit applied to a mobile phone as an example. When the charging port of the mobile phone is connected to a charger, the charger rectifies the AC power into DC. The DC signal can be used as an input source. If the input source is connected to the high-voltage side of the charge pump circuit, the high-voltage side switches from a state where there is no voltage to a state where there is a voltage signal. At this time, the charge pump circuit is in the first step-down mode. If the input voltage is 16V, the voltage of battery B is 8V.

In some other optional examples, when the control unit 10 receives a first-level voltage reduction control instruction issued by a user, the charge pump circuit is in the first voltage reduction mode.

Please refer to Figures 6 to 9, and please refer to Figures 3 to 4 together. In other optional examples, when the charge pump circuit is in the second buck mode, the control unit 10 can control the second switch S2 and the fourth switch S4 to be turned off, and control the fifth switch S5 to be turned on.

The control unit 10 can also control the third switch S3 and the seventh switch S7 to be turned on in the third period, and control the first switch S1 and the sixth switch S6 to be turned off in the fourth period.

It should be noted that the second voltage reduction mode may refer to a mode in which the battery B is reused in the secondary voltage regulation circuit, the voltage output end of the primary voltage regulation of the charge pump circuit is used as the voltage input end of the secondary voltage regulation of the charge pump circuit, and the voltage output end of the secondary voltage regulation of the charge pump circuit outputs the secondary voltage reduced voltage. The duration of the third period may be the same as or similar to the duration of the fourth period.

In this example, when the secondary voltage reduction is performed on the basis of the primary voltage reduction, the second switch S2 and the fourth switch S4 are in the normally-off state, and the fifth switch S5 is in the normally-closed state. At this time, the voltage output end of the primary voltage regulation of the charge pump circuit serves as the voltage input end of the secondary voltage regulation.

In this working mode, it can be divided into two processing periods, in which the third switch S3, the seventh switch S7, the first switch S1 and the sixth switch S6 are alternately turned on.

For example, within a switch control cycle in which the control unit 10 controls the charge pump circuit to perform secondary voltage reduction, the duration of the enable signal of the control unit 10 on the third switch S3 and the seventh switch S7 is consistent with or similar to the duration of the enable signal of the control unit 10 on the first switch S1 and the sixth switch S6.

Please refer to Figure 8. In the third period, which is the first half of a switch control cycle of the secondary voltage reduction, the third switch S3, the fifth switch S5 and the seventh switch S7 are turned on, and the first switch S1, the second switch S2, the fourth switch S4 and the sixth switch S6 are turned off. At this time, the input source stops being connected, and the voltage output end of the primary voltage regulation of the charge pump circuit is used as the voltage output end of the secondary voltage regulation, so that the battery B can supply power to the energy storage unit Cfly and the voltage output end of the secondary voltage regulation of the charge pump circuit. In this stage, there is a voltage relationship of the following formula (4).
V _bat = V _c + V _PH (4)

Wherein, V _bat is the voltage when the voltage output end of the first-stage voltage regulation of the charge pump circuit is connected to the battery B, V _c is the voltage across the energy storage unit Cfly, and V _PH is the load voltage when the voltage output end of the second-stage voltage regulation of the charge pump circuit is connected to the load.

Please refer to FIG9 , in the fourth period, which is the second half of a switch control cycle of the secondary buck, the first switch S1, the fifth switch S5 and the sixth switch S6 are turned on, the second switch S2, the third switch S3, the fourth switch S4 and the seventh switch S7 are turned off, and the energy storage unit Cfly can supply power to the load. In this stage, there is a voltage relationship of the following formula (5).
V _c ＝V _PH (5)

According to the above equations (4) and (5), when the charge pump circuit performs two-stage step-down processing, the relationship between the output voltage of the voltage output end of the second-stage voltage regulation and the voltage output end of the first-stage voltage regulation is shown in the following equation (6), thereby realizing a two-stage step-down conversion.
V _PH ＝V _bat /2 (6)

In these embodiments, after the step-down process of the charge pump circuit, the load voltage is made half of the voltage of the battery B connected to the voltage output end of the primary voltage regulation. Therefore, in combination with the primary step-down process, the first switch S1, the third switch S3, the energy storage unit Cfly and the voltage output end of the primary voltage regulation are reused in the case of two step-down processes, which reduces the number of electronic components and saves the cost of circuit components. Compared with the voltage of the input source, the voltage output end voltage of the secondary voltage regulation is reduced to one-fourth of the input source voltage, realizing the secondary step-down conversion.

In some optional examples, please continue to refer to Figure 3, the charge pump circuit can be in the second step-down mode when the voltage input end is the high voltage side of the charge pump circuit and the high voltage side switches from a state with a voltage signal to a state without a voltage signal.

Continuing to use the charge pump circuit applied to a mobile phone as an example, when the charging port of the mobile phone is connected to a charger, the charger rectifies the connected AC power into DC as the input source. If the input source is connected to the high-voltage side of the charge pump circuit, when the user unplugs the charger, the high-voltage side switches from a voltage state to a voltage signal state, and the charge pump circuit is in the second step-down mode. For example, when the voltage of battery B is 8V, a 4V voltage can be output by stepping down to power various circuits in the mobile phone system.

Alternatively, the control unit 10 may also place the charge pump circuit in the second voltage reduction mode when receiving a secondary voltage reduction control instruction issued by the user.

In some further optional examples, please refer to FIG. 10 and FIG. 11 , and also refer to FIG. 3 and FIG. 5 . When the charge pump circuit is in the first boost mode, the control unit 10 may control the second switch S2 and the fourth switch S4 to be turned off, and control the fifth switch S5 to be turned on.

The control unit 10 can also be used to control the first switch S1 and the sixth switch S6 to be turned on and the third switch S3 and the seventh switch S7 to be turned off in the fifth period, and to control the third switch S3 and the seventh switch S7 to be turned on and the first switch S1 and the sixth switch S6 to be turned off in the sixth period.

It should be noted that the first boost mode may refer to a mode in which the charge pump circuit inputs a voltage from the low voltage side and outputs a boosted voltage to the battery B through the voltage output terminal of the first voltage regulator of the charge pump circuit. The duration of the fifth time period may be the same as or similar to the duration of the sixth time period.

In this example, when implementing the first-stage boost, the second switch S2 and the fourth switch S4 are controlled to be in a normally-off state, and the fifth switch S5 is in a normally-closed state. When the charge pump circuit operates in this mode, it can be divided into two processing periods, in which the first switch S1, the sixth switch S6 and the third switch S3, the seventh switch S7 are alternately turned on.

For example, within a switch control cycle corresponding to the control unit 10 controlling the charge pump circuit to perform a first-stage boost, the duration of the enable signal of the control unit 10 for the first switch S1 and the sixth switch S6 is consistent with or similar to the duration of the enable signal of the control unit 10 for the sixth switch S6 and the third switch S3.

Please refer to Figure 10. In the fifth period, which is the first half of the switch control period corresponding to the first-stage boost, the first switch S1, the fifth switch S5 and the sixth switch S6 are turned on, and the second switch S2, the third switch S3, the fourth switch S4 and the seventh switch S7 are turned off. At this time, the side of the charge pump circuit close to the fifth switch S5 is connected to the input source, and the input source charges the energy storage unit Cfly. At this stage, there is a voltage relationship of the following formula (7).
V _in =V _c (7)

Wherein, _Vin is the input source voltage, and _Vc is the voltage across the energy storage unit Cfly.

Please refer to Figure 11. In the sixth period, which is the second half of the switch control cycle corresponding to the first-stage boost, the first switch S1 and the sixth switch S6 are turned off, the third switch S3 and the seventh switch S7 are turned on, the second switch S2 and the fourth switch S4 are still turned off, and the fifth switch S5 is still turned on. The input source and the energy storage unit Cfly together output electrical energy to the voltage output terminal of the first-stage voltage regulation of the charge pump circuit, that is, to charge the battery B connected to the first-stage voltage regulation. In this stage The voltage relationship between the two segments is as follows:
V _bat =V _in +V _c (8)

According to the above equations (7) and (8), when the charge pump circuit performs a voltage boost process, the relationship between the input voltage and the output voltage of the voltage output terminal of the first-stage voltage regulation is shown in the following equation (9). Thus, the first-stage voltage boost conversion is realized.
V _bat = 2*V _in (9)

In these embodiments, the energy storage unit Cfly is charged in advance, and then the energy storage unit Cfly and the input source provide electrical energy to the voltage output end of the first-stage voltage regulation, so that the voltage output of the first-stage voltage regulation is twice the input voltage, realizing a first-stage boost conversion.

It should be noted that the charge pump circuit may be in the first boost mode when the voltage input terminal is the low voltage side of the charge pump circuit and the low voltage side switches from a state where no voltage signal exists to a state where a voltage signal exists.

Take the charge pump circuit applied to a mobile phone as an example. When the charging port of the mobile phone is connected to a charger, the charger rectifies the mains power into DC. The DC signal can be used as an input source. If the input source is connected to the low-voltage side of the charge pump circuit, the low-voltage side switches from a state where there is no voltage to a state where there is a voltage signal, and the charge pump circuit is in the first boost mode. For example, if the voltage of the input source is 4V, the voltage of battery B is 8V.

In some other optional examples, upon receiving a first-level boost instruction issued by a user, the charge pump circuit is in the first boost mode.

Please refer to FIG. 10 to FIG. 13 , and also refer to FIG. 3 and FIG. 5 . When the charge pump circuit is in the second boost mode, the control unit 10 may control the fifth switch S5 , the sixth switch S6 , and the seventh switch S7 to be turned off.

The control unit 10 can control the first switch S1 and the third switch S3 to be turned on and the second switch S2 and the fourth switch S4 to be turned off in the seventh period, and control the second switch S2 and the fourth switch S4 to be turned on and the first switch S1 and the third switch S3 to be turned off in the eighth period.

It should be noted that the second boost mode may refer to a mode in which the battery B is reused in the secondary voltage regulation circuit, and the voltage output end of the primary voltage regulation of the charge pump circuit is used as the voltage input end of the secondary voltage regulation of the charge pump circuit, so that the voltage output end of the secondary voltage regulation of the charge pump circuit outputs the secondary boosted voltage. The duration of the seventh period is consistent with or similar to the duration of the eighth period.

In this example, when the secondary voltage boost is performed on the basis of the primary voltage boost, the fifth switch S5, the sixth switch S6 and the seventh switch S7 are in the normally off state, and the primary voltage regulation voltage output terminal of the charge pump circuit serves as the secondary voltage regulation voltage input terminal.

In this working mode, it can be divided into two processing periods, in which the first switch S1, the third switch S3, the second switch S2 and the fourth switch S4 are alternately turned on.

For example, within a switch control cycle in which the control unit 10 controls the charge pump circuit to perform secondary boost, the duration of the enable signal of the control unit 10 on the first switch S1 and the third switch S3 is consistent with or similar to the duration of the enable signal of the control unit 10 on the second switch S2 and the fourth switch S4.

Please refer to Figure 12. In the seventh period, which is the first half of a switch control cycle of the secondary boost, the first switch S1 and the third switch S3 are turned on, and the second switch S2, the fourth switch S4, the fifth switch S5, the sixth switch S6 and the seventh switch S7 are turned off. At this time, the input source stops being connected, and the voltage output end of the primary voltage regulation of the charge pump circuit serves as the voltage output end of the secondary voltage regulation, so that the battery B can supply power to the energy storage unit Cfly. At this stage, there is a voltage relationship of the following formula (10).
V _bat =V _c (10)

Wherein, V _bat is the voltage when the voltage output end of the first-stage voltage regulation of the charge pump circuit is connected to the battery B, and V _c is the voltage across the energy storage unit Cfly.

Please refer to Figure 13. In the eighth period, which is the second half of a switch control cycle of the second-stage boost, the second switch S2 and the fourth switch S4 are turned on, and the first switch S1, the third switch S3, the fifth switch S5, the sixth switch S6 and the seventh switch S7 are turned off. At this time, the charged energy storage unit Cfly and the voltage output end of the first-stage voltage regulation supply power to the load together. In this stage, the voltage relationship of the following formula (11) exists.
V _PH ＝V _bat +V _c (11)

According to the above formulas (10) and (11), when the charge pump circuit performs two-stage boost processing, the energy storage unit Cfly is charged in advance, and then the energy storage unit Cfly is combined with the voltage output end of the first-stage voltage regulation to provide electrical energy to the load. At this time, the relationship between the output voltage of the voltage output end of the second-stage voltage regulation and the voltage output end of the first-stage voltage regulation is shown in the following formula (12). Thus, the two-stage boost conversion is realized.
V _PH ＝2*V _bat (12)

In these embodiments, after the boosting process of the charge pump circuit, the load voltage is twice the voltage of the battery B connected to the voltage output end of the primary voltage regulation. Therefore, in combination with the primary boosting process, the first switch S1, the third switch S3, the energy storage unit Cfly and the voltage output end of the primary voltage regulation are reused in the case of boosting twice, which reduces the number of electronic components and saves the cost of circuit components. Compared with the voltage of the input source, the voltage output end of the secondary voltage regulation is increased to four times the voltage of the input source, realizing the secondary boost conversion.

It should also be noted that when the voltage input end is the low voltage side of the charge pump circuit and the low voltage side switches from a state where a voltage signal exists to a state where no voltage signal exists, the charge pump circuit is in the second boost mode.

Continuing with the example of the charge pump circuit applied to a mobile phone, when the charging port of the mobile phone is connected to a charger, the charger rectifies the connected AC power into DC as the input source. If the input source is connected to the low-voltage side of the charge pump circuit, and the user unplugs the charger at this time, the low-voltage side switches from a voltage state to a voltage signal state, and the charge pump circuit is in the second boost mode. For example, when the voltage of battery B is 8V, a 16V voltage can be output by boosting to power various circuits in the mobile phone system.

Alternatively, in some optional examples, when the control unit 10 receives a secondary boost control instruction from the user, the charge pump circuit is in the second boost mode.

Please continue to refer to Figures 3 to 13. The present application also provides a charge pump circuit, which includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, an energy storage unit Cfly and a control unit 10.

The first switch S1 , the second switch S2 and the third switch S3 are connected in series in sequence, and a common end of the second switch S2 and the third switch S3 serves as a voltage output end of a primary voltage regulation of the charge pump circuit.

A first end of the energy storage unit is connected between the first switch S1 and the second switch S2 , and a second end of the energy storage unit is connected to a common end of the third switch S3 , the fourth switch S4 , and the sixth switch S6 .

A first end of the seventh switch is connected between the first switch S1 and the second switch S2 , and a second end of the seventh switch is connected between the fifth switch S5 and the sixth switch S6 .

The control end of the first switch S1, the control end of the second switch S2, and the control end of the third switch S3 The control end of the fourth switch S4, the control end of the fifth switch S5, the control end of the sixth switch S6 and the control end of the seventh switch are connected to the control unit 10.

When the charge pump circuit is in the buck mode, the second end of the fourth switch S4 is the voltage input end of the charge pump circuit, and the first end of the fifth switch S5 is the voltage output end of the secondary voltage regulation of the charge pump circuit.

When the charge pump circuit is in the boost mode, the second end of the fourth switch S4 is the voltage output end of the secondary voltage regulation of the charge pump circuit, and the first end of the fifth switch S5 is the voltage input end of the charge pump circuit.

The specific implementation method and beneficial effects of the charge pump circuit in this example can be referred to the charge pump circuit in the previous example, and will not be elaborated here.

The charge pump circuit of the embodiment of the present application is described in detail above in conjunction with Figures 1 to 13. On this basis, the embodiment of the present application also protects an electronic device, which can be at least one of a wearable device, a camera, a mobile phone, a tablet computer, a television, and a display.

The electronic device may include a housing and a charge pump circuit disposed in the housing, and the charge pump circuit may be configured as the charge pump circuit of the above embodiment. The electronic device includes the charge pump circuit provided by the above embodiment, so the electronic device has all the beneficial effects of the above charge pump circuit.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

A charge pump circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an energy storage unit and a control unit;

Wherein, the first switch, the second switch and the third switch are connected in series in sequence, and the common end of the second switch and the third switch serves as the voltage output end of the first-stage voltage regulation of the charge pump circuit;

The fourth switch, the sixth switch and the fifth switch are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulation of the charge pump circuit;

The first end of the energy storage unit is connected between the first switch and the second switch, and the second end of the energy storage unit is connected to the common end of the third switch, the fourth switch and the sixth switch;

A first end of the seventh switch is connected between the first switch and the second switch, and a second end of the seventh switch is connected between the fifth switch and the sixth switch;

The control end of the first switch, the control end of the second switch, the control end of the third switch, the control end of the fourth switch, the control end of the fifth switch, the control end of the sixth switch and the control end of the seventh switch are connected to the control unit.
The charge pump circuit according to claim 1, further comprising a battery, wherein the voltage output terminal of the primary voltage regulator of the charge pump circuit is connected to the positive electrode of the battery;

A first end of the first switch is connected to the negative electrode of the battery, and a second end of the first switch is connected to the second switch;

When the charge pump circuit is in a step-down mode, the fourth switch is connected to a voltage input terminal of the charge pump circuit, the fifth switch is connected to a voltage output terminal of a secondary voltage regulator of the charge pump circuit, and the sixth switch is connected in series between the fourth switch and the fifth switch;

When the charge pump circuit is in boost mode, the fourth switch is connected to the voltage output terminal of the secondary voltage regulation of the charge pump circuit, the fifth switch is connected to the voltage input terminal of the charge pump circuit, and the sixth switch is connected in series between the fourth switch and the fifth switch.
The charge pump circuit according to claim 1, wherein when the charge pump circuit is in the first step-down mode, the fifth switch, the sixth switch and the seventh switch are controlled to be turned off;

Controlling the second switch and the fourth switch to be turned on, and controlling the first switch and the third switch to be turned off during a first time period;

Controlling the first switch and the third switch to be turned on, and controlling the second switch and the fourth switch to be turned off in a second time period;

The voltage output end of the first-stage voltage regulation of the charge pump circuit is the voltage output end when the charge pump circuit is in the first step-down mode.
The charge pump circuit according to any one of claims 1 to 3, wherein when the charge pump circuit is in the second step-down mode, the second switch and the fourth switch are controlled to be turned off;

Controlling the fifth switch to be turned on;

Controlling the third switch and the seventh switch to be turned on, and controlling the first switch and the sixth switch to be turned off in a third time period;

In a fourth time period, the first switch and the sixth switch are controlled to be turned on, and the third switch and the seventh switch are controlled to be turned off;

The first end of the fifth switch is a voltage output end when the charge pump circuit is in the second buck mode, and the second end of the fifth switch is connected to the sixth switch.
The charge pump circuit according to claim 4, wherein the duration of the third time period is consistent with the duration of the fourth time period.
The charge pump circuit according to claim 1, wherein when the charge pump circuit is in the first boost mode, the second switch and the fourth switch are controlled to be turned off;

Controlling the fifth switch to be turned on;

In a fifth time period, the first switch and the sixth switch are controlled to be turned on, and the third switch and the seventh switch are controlled to be turned off;

Controlling the third switch and the seventh switch to be turned on, and controlling the first switch and the sixth switch to be turned off in a sixth time period;

The voltage output end of the first-stage voltage regulation of the charge pump circuit is the voltage output end when the charge pump circuit is in the first boost mode.
The charge pump circuit according to claim 1, 2 or 6, wherein, when the charge pump circuit is in the second boost mode, the fifth switch, the sixth switch and the The seventh switch is turned off;

In a seventh time period, the first switch and the third switch are controlled to be turned on, and the second switch and the fourth switch are controlled to be turned off;

In an eighth time period, the second switch and the fourth switch are controlled to be turned on, and the first switch and the third switch are controlled to be turned off;

A first end of the fourth switch is connected to the sixth switch and the third switch, and a second end of the fourth switch is a voltage output end when the charge pump circuit is in the second boost mode.
The charge pump circuit according to claim 7, wherein the duration of the seventh time period is consistent with the duration of the eighth time period.
A charge pump circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch and an energy storage unit;

A first end of the first switch is connected to a first ground terminal and a negative electrode of a battery, and a second end of the first switch is connected to a first end of the second switch;

The second end of the second switch is electrically connected to the first end of the third switch, and a node where the second end of the second switch and the first end of the third switch are connected serves as a voltage output end of a primary voltage regulator of the charge pump circuit, and the voltage output end of the primary voltage regulator of the charge pump circuit is connected to the positive electrode of the battery;

The second end of the third switch is connected to the first end of the fourth switch and the second end of the sixth switch, and the first end of the sixth switch is connected to the second end of the fifth switch;

The first end of the seventh switch is connected to the second end of the first switch and the first end of the second switch, and the second end of the seventh switch is connected to the second end of the fifth switch and the first end of the sixth switch;

The first end of the energy storage unit is connected to the second end of the first switch and the first end of the second switch, and the second end of the energy storage unit is connected to the second end of the third switch, the first end of the fourth switch and the second end of the sixth switch;

The control end of the first switch, the control end of the second switch, the control end of the third switch, the control end of the fourth switch, the control end of the fifth switch, the control end of the sixth switch and the control end of the seventh switch are respectively connected to the control signal;

When the charge pump circuit is in the buck mode, the second end of the fourth switch is The voltage input end of the charge pump circuit, the first end of the fifth switch is the voltage output end of the secondary voltage regulation of the charge pump circuit;

When the charge pump circuit is in the boost mode, the second end of the fourth switch is the voltage output end of the secondary voltage regulation of the charge pump circuit, and the first end of the fifth switch is the voltage input end of the charge pump circuit.
An electronic device, comprising the charge pump circuit according to any one of claims 1 to 9.