CN115113669A - Power supply circuit and power supply method - Google Patents
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Abstract
The invention discloses a power supply circuit and a power supply method. The power supply circuit comprises a control circuit and a power circuit, the control circuit compares a first power supply voltage, a second power supply voltage and a preset reference voltage, the power supply voltage of the power supply circuit is determined according to a comparison result, under the condition that the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are larger than the preset reference voltage, the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are selected to supply power to the chip, and under the condition that the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are smaller than the preset reference voltage, the higher potential of the first power supply voltage and the higher potential of the second power supply voltage are selected to supply power to the chip, so that the normal work of a rear-stage circuit can be guaranteed, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
Description
Technical Field
The present invention relates to the field of electronic circuit technologies, and in particular, to a power supply circuit and a power supply method.
Background
The conventional portable electronic products and wearable electronic equipment, such as smart phones, tablet computers, smart watches and the like, adopt rechargeable batteries to provide power for the system, so that the system can still work normally when no external power supply is connected; when the battery is not powered, the battery is charged by an external power supply, and the system is powered by the external power supply. Therefore, battery Management chips (Power Management Integrated Circuits) are very important for these portable electronic products.
A Low Dropout Regulator (LDO) has the characteristics of simple structure, Low static power consumption, and small output voltage ripple, and therefore, a voltage conversion unit of an existing power management chip is generally implemented by the LDO. The power management chip often needs to select the voltage at the BUS terminal or the SYS terminal as the supply voltage of the internal LDO, so that the LDO converts the supply voltage at the supply terminal into the operating voltage of the subsequent circuit. The traditional method is to compare the voltage of the BUS end with the voltage of the SYS end, and take the end with higher voltage as the power supply end of the LDO. Taking the lowest working voltage of the later stage circuit as 5V as an example, when Vbus is more than 5V and Vsys is less than 5V, the power management chip selects the voltage at the BUS end to supply power for the LDO, and the output voltage of the LDO can reach 5V; when Vbus is less than Vsys and less than 5V, the power management chip selects the voltage at the SYS end to supply power to the LDO, the LDO is in an overdrive state, and the output voltage can still be the maximum voltage which can be reached under the current condition; when Vbus > Vsys >5V, the voltage of the BUS end or the voltage of the SYS end can be selected to enable the output voltage of the LDO to reach 5V, and the end with higher voltage is selected to serve as the power supply end of the LDO in the traditional method, so that the power consumption of the circuit is higher, and the light load efficiency of the circuit is seriously reduced.
Disclosure of Invention
In view of this, the present invention provides a power supply circuit and a power supply method, which can reduce power consumption of a circuit and improve light load efficiency of the circuit on the basis of ensuring the lowest working voltage of a subsequent circuit.
According to an aspect of the embodiments of the present invention, there is provided a power supply circuit for supplying an output voltage to a post-stage circuit, including: the control circuit is used for comparing a first power supply voltage with a second power supply voltage to obtain a first comparison signal, comparing the lower potential of the first power supply voltage with the second power supply voltage with a preset reference voltage to obtain a second comparison signal, and generating a control signal according to the first comparison signal and the second comparison signal; and a power circuit controlled by the control signal to convert the first supply voltage or the second supply voltage into the output voltage, wherein the power circuit is configured to generate the output voltage according to a lower potential of the first supply voltage and the second supply voltage when a lower potential of the first supply voltage and the second supply voltage is greater than the preset reference voltage; and generating the output voltage according to a higher one of the first supply voltage and the second supply voltage when a lower one of the first supply voltage and the second supply voltage is less than the preset reference voltage.
Optionally, the control circuit includes: the voltage division module is used for obtaining a first voltage division signal and a second voltage division signal according to the first power supply voltage and the second power supply voltage respectively; a comparison selection module, configured to compare the first divided-voltage signal with the second divided-voltage signal to generate a first comparison signal and a first voltage signal, where the first voltage signal is used to characterize a lower potential of the first power supply voltage and the second power supply voltage; the non-inverting input end of the first comparator receives the first voltage signal, the inverting input end of the first comparator receives a reference voltage signal representing the preset reference voltage for comparison, and the output end of the first comparator outputs a second comparison signal; and the first input end of the output module receives the first comparison signal, the second input end of the output module receives the second comparison signal, and the output end of the output module outputs the control signal.
Optionally, the comparison selection module includes: a second comparator, wherein the non-inverting input end receives the second divided voltage signal, the inverting input end receives the first divided voltage signal, and the output end outputs the first comparison signal; a first switch connected between the first divided voltage signal and an output terminal of the first voltage signal; and a second switch connected between the output ends of the second voltage division signal and the first voltage signal, wherein the first switch and the second switch are controlled by the first comparison signal, and the first switch and the second switch are not turned on at the same time.
Optionally, the output module is configured to output the control signal as a logic low level when one and only one of the first comparison signal and the second comparison signal is a logic low level; and outputting the control signal as a logic high level when the levels of the first comparison signal and the second comparison signal are the same.
Optionally, the output module is implemented by an exclusive nor gate.
Optionally, the power circuit is configured to generate the output voltage according to the first power supply voltage when the control signal is at a logic high level, and generate the output voltage according to the second power supply voltage when the control signal is at a logic low level.
Optionally, the power circuit includes: the first conversion module is used for converting the first power supply voltage into a first conversion voltage; the second conversion module is used for converting the second power supply voltage into a second conversion voltage; and a third switch, a first input end of which is connected to an output end of the first conversion module, and a second input end of which is connected to an output end of the second conversion module, and configured to obtain the output voltage according to the first conversion voltage when the control signal is at a logic high level, and obtain the output voltage according to the second conversion voltage when the control signal is at a logic low level.
Optionally, the first conversion module and the second conversion module are implemented by a low dropout regulator.
Optionally, the third switch is an alternative switch formed by MOS transistors.
According to another aspect of the embodiments of the present invention, there is provided a power supply method for supplying an output voltage to a subsequent stage circuit, including: comparing the first supply voltage with the second supply voltage to obtain a first comparison signal; comparing the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain a second comparison signal; the first comparison signal and the second comparison signal generate a control signal; and converting the first supply voltage or the second supply voltage into the output voltage according to the control signal, wherein the converting the first supply voltage or the second supply voltage into the output voltage according to the control signal comprises: generating the output voltage according to the lower potential of the first supply voltage and the second supply voltage when the control signal indicates that the lower potential of the first supply voltage and the second supply voltage is greater than the preset reference voltage; and under the condition that the control signal indicates that the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage, controlling the power circuit to generate the output voltage according to the higher potential of the first power supply voltage and the second power supply voltage.
In the power supply circuit and the power supply method of the embodiment of the invention, the power supply circuit comprises a control circuit and a power circuit, the control circuit is used for comparing a first power supply voltage with a second power supply voltage, determining the lower potential of the first power supply voltage and the second power supply voltage according to a first comparison result, comparing the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain a second comparison result, and controlling the switching of the power supply end of the power circuit according to the first comparison result and the second comparison result. The lower potential of the first power supply voltage and the lower potential of the second power supply voltage are selected to supply power to the chip under the condition that the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are greater than the preset reference voltage, and the higher potential of the first power supply voltage and the lower potential of the second power supply voltage are selected to supply power to the chip under the condition that the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are less than the preset reference voltage, so that the normal work of a rear-stage circuit can be guaranteed, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 shows a schematic block diagram of a power supply circuit according to an embodiment of the invention;
FIG. 2 shows a schematic circuit diagram of a control circuit in a power supply circuit according to an embodiment of the invention;
fig. 3 shows a schematic circuit diagram of a power circuit in a supply circuit according to an embodiment of the invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through an electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Fig. 1 shows a schematic configuration diagram of a power supply circuit according to an embodiment of the present invention. As shown in fig. 1, the power supply circuit 100 includes a control circuit 110 and a power circuit 120. The control circuit 110 is connected to the BUS terminal and the SYS terminal to receive the first power supply voltage Vbus and the second power supply voltage Vsys, respectively, and the control circuit 110 is configured to compare the first power supply voltage Vbus and the second power supply voltage Vsys to obtain a first comparison signal, determine a lower potential of the first power supply voltage Vbus and the second power supply voltage Vsys according to the first comparison signal, compare the lower potential of the first power supply voltage Vbus and the second power supply voltage Vsys with a preset reference voltage to obtain a second comparison signal, and finally generate a control signal Vctrl according to the first comparison signal and the second comparison signal. The power circuit 120 is controlled by the control signal Vctrl to convert the first power supply voltage Vbus or the second power supply voltage Vsys into an output voltage Vregn, which is an operating voltage of a subsequent circuit.
The power circuit 120 is configured to generate an output voltage Vregn according to a lower one of the first supply voltage Vbus and the second supply voltage Vsys when the lower one of the first supply voltage Vbus and the second supply voltage Vsys is greater than a preset reference voltage; when the lower potential of the first power supply voltage Vbus and the second power supply voltage Vsys is lower than a preset reference voltage, an output voltage Vregn is generated according to the higher potential of the first power supply voltage Vbus and the second power supply voltage Vsys. The preset reference voltage is set according to the lowest operating voltage of the rear-stage circuit, for example, so that the output voltage can be generated according to the higher voltage of the first power supply voltage Vbus and the second power supply voltage Vsys when the lowest voltage of the first power supply voltage Vbus and the second power supply voltage Vsys is less than the reference voltage, and the normal operation of the rear-stage circuit can be ensured.
Fig. 2 shows that in the power supply circuit according to the embodiment of the present invention, as shown in fig. 2, the control circuit 110 includes a voltage division module 101, a comparison selection module 102, a comparator CMP1, and an output module 103. The voltage dividing module 101 obtains a first voltage dividing signal V1 and a second voltage dividing signal V2 according to the first power supply voltage Vbus and the second power supply voltage Vsys, respectively. The comparison selection module 102 is configured to compare the first voltage-dividing signal V1 with the second voltage-dividing signal V2 to generate a first comparison signal Va and a first voltage signal Vx, where the first voltage signal Vx is used to represent the lower potential of the first power supply voltage Vbus and the second power supply voltage Vsys. The non-inverting input terminal of the comparator CMP1 receives a first voltage signal Vx, the inverting input terminal receives a reference voltage signal Vref representing a preset reference voltage, and the comparator CMP1 is configured to compare the first voltage signal Vx with the reference voltage signal Vref to generate a second comparison signal Vb. The output module 103 has a first input end receiving the first comparison signal Va, a second input end receiving the second comparison signal Vb, and an output end for outputting the control signal Vctrl.
Further, the comparison selection module 102 includes a comparator CMP2, a switch S1, and a switch S2. The inverting input terminal of the comparator CMP2 receives the first divided voltage signal V1, the non-inverting input terminal thereof receives the second divided voltage signal V2, and the output terminal thereof outputs the first comparison signal Va. The switch S1 is connected between the first divided signal V1 and the output of the first voltage signal Vx, and the switch S2 is connected between the second divided signal V2 and the output of the first voltage signal Vx. The switch S1 and the switch S2 are controlled by the first comparison signal Va, and the switch S1 and the switch S2 are not turned on simultaneously. Illustratively, when the first comparison signal Va is at a logic high level, the switch S1 is turned on, the switch S2 is turned off, the first voltage signal Vx is equal to the first voltage-dividing signal V1, and when the first comparison signal Va is at a logic low level, the switch S1 is turned off, the switch S2 is turned on, and the first voltage signal Vx is equal to the second voltage-dividing signal V2.
Further, the output module 103 is implemented by an exclusive nor gate XNOR, for example, and when one and only one of the first comparison signal Va and the second comparison signal Vb is at a logic low level, the output control signal Vctrl is at a logic low level, and when the levels of the first comparison signal Va and the second comparison signal Vb are the same, the output control signal Vctrl is at a logic high level.
Fig. 3 shows a schematic circuit diagram of a power circuit of a supply circuit according to an embodiment of the invention. As shown in fig. 3, the power circuit 120 includes a first conversion module 121, a second conversion module 122, and a switch S3. The first conversion module 121 and the second conversion module 122 are implemented by LDOs, for example, the first conversion module 121 is used for converting the first supply voltage Vbus into the first conversion voltage Vo1, and the second conversion module 122 is used for converting the second supply voltage Vsys into the second conversion voltage Vo 2. A first input of the switch S3 is connected to the output of the first conversion module 121, and a second input is connected to the output of the second conversion module 122. The switch S3 is, for example, an alternative switch, and when the control signal Vctrl is at a logic high level, the switch S3 turns on the first input terminal to obtain the output voltage Vregn according to the first conversion voltage Vo1, and when the control signal Vctrl is at a logic low level, the switch S3 turns on the second input terminal to obtain the output voltage Vregn according to the second conversion voltage Vo 2.
It should be noted that the implementation manner of the switch S3 is not limited by the embodiment, and those skilled in the art may implement the switch S3 by using a bipolar type alternative switch or a MOS type alternative switch, or may implement the switch S3 by using a pair of complementary conducting transistors.
Table 1 shows a schematic diagram of the control logic of the power supply circuit of the present invention. In table 1, a logic high level is represented by "1" and a logic low level is represented by "0", and when the switch S3 is "ON", the switch S3 turns ON the first input terminal and the output terminal, and when the switch S3 is "OFF", the switch S3 turns ON the second input terminal and the output terminal.
TABLE 1
In the power supply circuit of the present invention, the voltage division block outputs the divided signals of the first power supply voltage Vbus and the second power supply voltage Vsys to the comparator CMP2 for comparison, the lower of the two is supplied to the non-inverting input terminal of the comparator CMP1 through the switch S1 and the switch S2 according to the comparison result, i.e., the first voltage signal Vx Min (V1, V2), the comparator CMP1 compares the first voltage signal Vx with the reference voltage signal Vref, by setting an appropriate reference voltage, it is determined whether the lower one of the first supply voltage Vbus and the second supply voltage Vsys can make the output voltage Vregn reach a preset reference value (e.g., 5V), the lower of the first supply voltage Vbus and the second supply voltage Vsys is selected, if possible, to supply the power circuit, and if not, the higher of the first supply voltage Vbus and the second supply voltage Vsys is selected to power the power circuit.
The power supply circuit of the embodiment preferentially ensures that the output voltage Vregn can reach the highest voltage value under the current condition, and optimizes the power consumption of the power supply circuit on the premise. That is, when at least one of the first supply voltage Vbus and the second supply voltage Vsys cannot make the output voltage Vregn reach the preset reference value, the LDO with the higher voltage end is selected to supply power to the chip, so that the output voltage Vregn can reach the highest voltage under the current condition; when the first power supply voltage Vbus and the second power supply voltage Vsys enable the output voltage Vregn to reach a preset reference value, the LDO with the lower voltage end of the first power supply voltage Vbus and the second power supply voltage Vsys is selected to supply power to the chip, so that power consumption of the circuit is reduced, and light load efficiency of the circuit is improved.
In summary, in the power supply circuit and the power supply method of the embodiment of the invention, the power supply circuit includes a control circuit and a power circuit, the control circuit is configured to compare the first power supply voltage and the second power supply voltage, determine a lower potential of the first power supply voltage and the second power supply voltage according to the first comparison result, compare the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain a second comparison result, and control switching of the power supply terminal of the power circuit according to the first comparison result and the second comparison result. The lower potential of the first power supply voltage and the lower potential of the second power supply voltage are selected to supply power to the chip under the condition that the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are greater than the preset reference voltage, and the higher potential of the first power supply voltage and the lower potential of the second power supply voltage are selected to supply power to the chip under the condition that the lower potential of the first power supply voltage and the lower potential of the second power supply voltage are less than the preset reference voltage, so that the normal work of a rear-stage circuit can be guaranteed, the power consumption of the circuit can be reduced, and the light load efficiency of the circuit is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A power supply circuit for providing an output voltage to a post-stage circuit, comprising:
the control circuit is used for comparing a first power supply voltage with a second power supply voltage to obtain a first comparison signal, comparing the lower potential of the first power supply voltage with the second power supply voltage with a preset reference voltage to obtain a second comparison signal, and generating a control signal according to the first comparison signal and the second comparison signal; and
a power circuit controlled by the control signal to convert the first supply voltage or the second supply voltage into the output voltage,
the power circuit is used for generating the output voltage according to the lower potential of the first power supply voltage and the second power supply voltage when the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage; and
and generating the output voltage according to the higher potential of the first power supply voltage and the second power supply voltage when the lower potential of the first power supply voltage and the second power supply voltage is smaller than the preset reference voltage.
2. The power supply circuit of claim 1, wherein the control circuit comprises:
the voltage division module is used for obtaining a first voltage division signal and a second voltage division signal according to the first power supply voltage and the second power supply voltage respectively;
a comparison selection module, configured to compare the first divided-voltage signal with the second divided-voltage signal to generate a first comparison signal and a first voltage signal, where the first voltage signal is used to represent a lower potential one of the first supply voltage and the second supply voltage;
the non-inverting input end of the first comparator receives the first voltage signal, the inverting input end of the first comparator receives a reference voltage signal representing the preset reference voltage for comparison, and the output end of the first comparator outputs a second comparison signal; and
and the first input end of the output module receives the first comparison signal, the second input end of the output module receives the second comparison signal, and the output end of the output module outputs the control signal.
3. The power supply circuit of claim 2, wherein the comparison selection module comprises:
a second comparator, wherein a non-inverting input end receives the second divided voltage signal, an inverting input end receives the first divided voltage signal, and an output end outputs the first comparison signal;
a first switch connected between the first divided voltage signal and an output terminal of the first voltage signal; and
a second switch connected between the second divided voltage signal and an output terminal of the first voltage signal,
wherein the first switch and the second switch are controlled by the first comparison signal, and the first switch and the second switch are not turned on simultaneously.
4. The power supply circuit of claim 2, wherein the output module is configured to output the control signal as a logic low level when one and only one of the first comparison signal and the second comparison signal are at a logic low level; and
and outputting the control signal as a logic high level when the levels of the first comparison signal and the second comparison signal are the same.
5. A supply circuit as claimed in claim 4, wherein the output module is implemented by an XOR gate.
6. The power supply circuit of claim 4, wherein the power circuit is configured to generate the output voltage from the first supply voltage when the control signal is at a logic high level and from the second supply voltage when the control signal is at a logic low level.
7. The power supply circuit of claim 6, wherein the power circuit comprises:
the first conversion module is used for converting the first power supply voltage into a first conversion voltage;
the second conversion module is used for converting the second power supply voltage into a second conversion voltage; and
and the first input end of the third switch is connected with the output end of the first conversion module, the second input end of the third switch is connected with the output end of the second conversion module, and the third switch is used for obtaining the output voltage according to the first conversion voltage when the control signal is at a logic high level and obtaining the output voltage according to the second conversion voltage when the control signal is at a logic low level.
8. The power supply circuit of claim 7, wherein the first and second conversion modules are implemented by a low dropout linear regulator.
9. The power supply circuit according to claim 7, wherein the third switch is an alternative switch composed of MOS transistors.
10. A power supply method for providing an output voltage to a subsequent stage circuit, comprising:
comparing the first supply voltage with the second supply voltage to obtain a first comparison signal;
comparing the lower potential of the first power supply voltage and the second power supply voltage with a preset reference voltage to obtain a second comparison signal;
the first comparison signal and the second comparison signal generate a control signal; and
converting the first supply voltage or the second supply voltage into the output voltage according to the control signal,
wherein the converting the first supply voltage or the second supply voltage to the output voltage according to the control signal comprises:
under the condition that the control signal indicates that the lower potential of the first power supply voltage and the second power supply voltage is larger than the preset reference voltage, generating the output voltage according to the lower potential of the first power supply voltage and the second power supply voltage; and
and under the condition that the control signal represents that the lower potential of the first supply voltage and the second supply voltage is smaller than the preset reference voltage, controlling the power circuit to generate the output voltage according to the higher potential of the first supply voltage and the second supply voltage.
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| CN1960152A (en) * | 2005-11-02 | 2007-05-09 | 鸿富锦精密工业（深圳）有限公司 | Source transfer circuit, and power supply system of using the circuit |
| CN101557122A (en) * | 2009-02-24 | 2009-10-14 | 深圳市民展科技开发有限公司 | Duplicate supply selection circuit |
| CN202363968U (en) * | 2011-12-14 | 2012-08-01 | 陕西千山航空电子有限责任公司 | Dual-power input selection and power reverse connection prevention circuit |
| TWM465721U (en) * | 2013-06-19 | 2013-11-11 | Richtek Technology Corp | Bi-directional switching regulator and control circuit thereof |
| CN203812136U (en) * | 2013-11-28 | 2014-09-03 | 苏州贝克微电子有限公司 | Low-power real-time clock circuit with system and battery electric quantity arbitration function |
| US20150333568A1 (en) * | 2014-05-18 | 2015-11-19 | Freescale Semiconductor, Inc. | Supply-switching system |
| CN203950230U (en) * | 2014-07-14 | 2014-11-19 | 衢州市沃思电子技术有限公司 | The electrical source exchange module of reference source |
| CN105988498A (en) * | 2015-03-06 | 2016-10-05 | 展讯通信（上海）有限公司 | Low voltage self-adapting power source system |
| CN212033826U (en) * | 2020-03-11 | 2020-11-27 | 深圳绿米联创科技有限公司 | Power supply circuit and electronic device |
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