CN221408463U

CN221408463U - Charging circuit and system with shared interface

Info

Publication number: CN221408463U
Application number: CN202322727773.7U
Authority: CN
Inventors: 杨志成
Original assignee: Zhejiang Xindong Energy Technology Co ltd
Current assignee: Zhejiang Xindong Energy Technology Co ltd
Priority date: 2023-10-10
Filing date: 2023-10-10
Publication date: 2024-07-23
Anticipated expiration: 2033-10-10

Abstract

The embodiment of the application relates to a charging circuit and a charging system of a shared interface, wherein the charging circuit comprises the shared interface, a logic control module and a transformation module; the shared interface is used for accessing various target power supplies; the logic control module is used for generating PWM signals according to the power of the target power supply; the voltage transformation module is used for adjusting the voltage of the charging circuit to a constant voltage according to the PWM signal and charging the battery module by the constant voltage.

Description

Charging circuit and system with shared interface

Technical Field

The present application relates to the field of electronic technologies, and in particular, to a charging circuit and a charging system for a common interface.

Background

Along with the gradual popularization of new energy sources, the photovoltaic energy storage charging technology becomes an important form in the new energy source technology, and the sustainable development of the new energy source technology can be effectively promoted by converting solar energy into electric energy and storing the electric energy by utilizing the energy storage technology. In the prior art, the direct current charging can provide stable and reliable power supply for equipment, has various purposes and convenient connection, and is also a common charging mode in daily life of people.

In the related art, patent document with application number 201420379796.1 and application name of solar charger discloses a solar charger, a PV component is arranged on a charger body, a DC/DC conversion module is arranged in the charger body, and a switch selection module and a first USB interface are also arranged on the charger body; the solar charger further comprises at least one battery, a second USB interface, a charging circuit for charging the battery, and a boosting circuit for boosting the voltage output by the battery to 5V to supply power to electric equipment, wherein the boosting circuit mainly depends on the energy for collecting sunlight to supply power required by daily normal power consumption of the user smart phone, and the switching selection module is used for switching to mains supply for charging when the solar energy is insufficient.

However, the solar charger in the related art uses two sets of respective charging circuits for direct current charging and photovoltaic charging, so that the charging cost is high, and the charging process is complex.

Disclosure of utility model

The application provides a charging circuit and a charging system with a shared interface, which are used for solving the technical problems of high charging cost and complex charging process caused by the fact that independent charging control systems are required to be used for charging different power supplies in the prior art.

In a first aspect, the application provides a charging circuit with a shared interface, wherein the charging circuit comprises the shared interface, a logic control module and a transformation module;

the shared interface is used for accessing a target power supply;

The logic control module is connected with the common interface and the transformation module, and is used for generating a PWM signal according to the power of the target power supply and outputting the PWM signal to the transformation module;

The voltage transformation module is connected with the common interface and is used for adjusting the voltage of the charging circuit to a constant voltage according to the PWM signal and charging the battery module with the constant voltage.

Further, the target power source comprises a direct current power source or a photovoltaic power source.

Further, the charging circuit further comprises a voltage detection module and a current detection module;

The voltage detection module is connected with the logic control module and is used for detecting the voltage value of the charging circuit and sending the voltage value to the logic control module;

The current detection module is connected with the logic control module and is used for detecting the current value of the charging circuit and sending the current value to the logic control module;

The logic control module is used for calculating the power of the target power supply according to the voltage value and the current value.

Further, the transformation module comprises a DC-DC control unit and a switch unit;

The DC-DC control unit is respectively connected with the logic control module and the switch unit and is used for outputting a control signal for driving the switch unit to the switch unit according to the PWM signal.

Further, the transformation module further comprises an energy storage unit, and the switch unit comprises a first switch assembly and a second switch assembly;

The first switch assembly is connected with the DC-DC control unit, the output end of the first switch assembly is connected with the energy storage unit, and the first switch assembly and the energy storage unit are matched to reduce the voltage when the voltage value is larger than the constant voltage;

The second switch assembly is connected with the DC-DC control unit, the input end of the second switch assembly is connected with the energy storage unit, and the second switch assembly and the energy storage unit are matched to boost when the voltage value is smaller than the constant voltage.

Further, the energy storage unit comprises an inductor.

Further, the first switch assembly comprises a first switch and a second switch, and the second switch assembly comprises a third switch and a fourth switch;

The first switch is connected with a first enabling pin of the DC-DC control unit and is used for being switched on or off according to a first PWM signal in the control signal;

The second switch is connected with a second enabling pin of the DC-DC control unit and is used for being switched on or off according to a second PWM signal in the control signal;

the third switch is connected with a third enabling pin of the DC-DC control unit and is used for being switched on or off according to a third PWM signal in the control signal;

The fourth switch is connected with a fourth enabling pin of the DC-DC control unit and is used for being conducted or cut off according to a fourth PWM signal in the control signals.

Further, the first switch, the second switch, the third switch and the fourth switch are N-MOS transistors.

Further, the charging circuit further comprises a circuit protection module;

The circuit protection module is respectively connected with the common interface and the transformation module and is used for disconnecting the charging circuit when the voltage value falls into a preset abnormal threshold value.

Further, the charging circuit further comprises a power supply module;

The power supply module is respectively connected with the shared interface and the logic control module and is used for supplying power to the logic control module.

In a second aspect, the present application provides a charging system of a common interface, the charging system comprising a charging circuit of the common interface as described in the first aspect and a battery module charged using the charging circuit.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: the embodiment of the application realizes the unified access of different types of charging power supplies by setting the common interfaces of multiple target power supplies, calculates the required current according to the power of the charging power supplies and the constant voltage of the battery module by the logic control module, generates PWM signals according to the required current and the current, realizes the dynamic management of the charging process of different power supplies, and the voltage transformation module adjusts the current of the charging circuit according to the PWM signals so as to adjust the voltage of the charging circuit to the constant voltage, thereby realizing the constant voltage charging of the target power supplies for the battery.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

Fig. 1 is a schematic structural diagram of a charging circuit according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a preferred charging circuit according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

In order to solve the technical problems of high charging cost and complex redundancy of a charging control system caused by the fact that independent charging control systems are required to be used for charging various power supplies in the prior art, the application provides a charging circuit 101, and fig. 1 shows a charging circuit with a shared interface provided by the embodiment of the application, wherein the charging circuit 101 comprises a shared interface 102, a logic control module 103 and a transformation module 104;

The common interface 102 is used to access a variety of target power sources.

The common interface 102 may be comprised of, among other things, a DC5521 (5525) interface or a XT60 interface.

The universal interface is arranged in the embodiment of the application, so that unified management of charging of various power supplies is realized, the circuit cost is saved, and the convenience of charging is improved.

The logic control module 103 is connected with the common interface 102 and the transformation module 104, and is configured to generate a PWM signal according to the power of the target power supply, and output the PWM signal to the transformation module 104;

The logic control module 103 may be composed of an MCU and peripheral devices, the PWM signal is a pulse width modulation signal, i.e. a duty cycle signal, and the logic control module 103 may be grounded.

Specifically, the logic control module 103 obtains the input power of the target power supply, calculates a required current value according to the input power and a constant voltage of the battery module 105 to be charged, the constant voltage can be input into the logic control module 103 in advance by a related person, the logic control module 103 further obtains a current value of the charging circuit 101, calculates a duty ratio according to the required current value and the current value, and further generates a duty ratio signal capable of adjusting the current value to the required current value, and the logic control module 103 sends the duty ratio signal to the voltage transformation module 104 through the enable pin EN.

The voltage transformation module 104 is connected to the common interface 102, and is configured to adjust the voltage of the charging circuit 101 to a constant voltage according to the PWM signal, and charge the battery module 105 with the constant voltage.

The constant voltage is an inherent property of the battery module 105, and the constant voltage used when charging batteries of different specifications is generally different.

Specifically, after the voltage transformation module 104 receives the PWM signal sent by the logic control module 103, the voltage transformation module 104 adjusts the current according to the PWM signal, so as to stabilize the output voltage at a constant voltage, thereby realizing charging the battery module 105 with the constant voltage of the battery module 105.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: according to the embodiment of the application, unified access of different types of charging power supplies is realized by setting the common interface 102 of the target power supply, the logic control module 103 calculates the required current according to the power of the charging power supply and the constant voltage of the battery module 105, PWM signals are generated according to the required current and the current, dynamic management of the charging process of different power supplies is realized, the voltage transformation module 104 adjusts the current of the charging circuit 101 according to the PWM signals, and then the voltage of the charging circuit 101 is adjusted to be the constant voltage, constant voltage charging of the target power supply for the battery module 105 is realized, and the charging circuit 101 has a simple structure, strong universality and low control cost.

On the basis of the above embodiment, the present application further provides a preferred embodiment, and fig. 2 is a schematic structural diagram of a preferred charging circuit according to the embodiment of the present application, as shown in fig. 2:

Optionally, the target power source includes a direct current power source or a photovoltaic power source.

It should be noted that, the current dc charging and the photovoltaic charging generally use two independent charging control systems, and each uses an interface in the control system to access a power supply, and in actual situations, an input voltage of the photovoltaic power supply is generally in an unstable state, so that the dc charging and the photovoltaic charging cannot be performed by using the same charging system.

The circuit arrangement of the embodiment of the application realizes unified management of charging of the direct-current power supply and the photovoltaic power supply, saves circuit cost and increases charging convenience.

Optionally, the charging circuit 101 further includes a voltage detection module 206 and a current detection module 207;

The voltage detection module 206 is connected to the logic control module 103, and is configured to detect a voltage value of the charging circuit 101 and send the voltage value to the logic control module 103;

The current detection module 207 is connected to the logic control module 103, and is configured to detect a current value of the charging circuit 101 and send the current value to the logic control module 103;

The logic control module 103 is configured to calculate the power of the target power supply according to the voltage value and the current value.

The voltage value detected by the voltage detection module 206 may be a voltage value between the charging power supply and the battery module 105, which may be a voltage dividing resistor, the current value detected by the current detection module 207 may be a current value at the output end of the common interface 102, which may be a current detecting resistor, an operational amplifier and a peripheral device, and the current detection module 207 may be grounded.

Specifically, the voltage value and the current value detected by the voltage detection module 206 and the current detection module 207 are real-time voltage values and current values, which may be sent to the logic control module 103 at preset intervals, where the preset intervals may be set on the logic control module 103 by a related person.

It can be obtained that the voltage value and the current value can be used for the logic control module 103 to calculate the power value of the charging power supply, and the embodiment of the application calculates the real-time power according to the voltage value and the current value measured in real time, thereby realizing real-time dynamic adjustment of the state of the charging circuit 101 according to the actual conditions of the load and the battery module 105, and ensuring the universality of the charging circuit 101.

Optionally, the voltage transformation module 104 includes a DC-DC control unit and a switching unit;

The DC-DC control unit is connected to the logic control module 103 and the switching unit, respectively, and is configured to output a control signal for driving the switching unit to the switching unit according to the PWM signal.

The DC-DC control unit consists of a DC control chip.

Specifically, the logic control module 103 sends the PWM signal to the DC-DC control unit in the voltage transformation module 104, and the DC-DC control unit analyzes the PWM signal and generates a control signal for driving the switching unit according to the analysis result, where the control signal acts on the switching unit to implement adjustment of the current of the charging circuit 101.

Optionally, the voltage transformation module 104 further includes an energy storage unit 209, and the switch unit includes a first switch component 210 and a second switch component 211;

The first switch assembly 210 is connected with the DC-DC control unit, an output end of the first switch assembly 210 is connected with the energy storage unit 209, and the first switch assembly 210 and the energy storage unit 209 are matched to reduce the voltage when the voltage value is greater than the constant voltage;

The second switch assembly 211 is connected with the DC-DC control unit, an input end of the second switch assembly 211 is connected with the energy storage unit 209, and the second switch assembly 211 and the energy storage unit 209 are matched to boost when the voltage value is smaller than the constant voltage.

Wherein the first and second switch assemblies 210 and 211 may be grounded.

Specifically, when the voltage value detected by the voltage detection unit is greater than the constant voltage of the battery module 105, the output end of the first switch component 210 is connected with the energy storage unit 209 to realize voltage reduction, the first switch component 210 is turned on and off according to the control signal output by the DC-DC control unit to realize current regulation, then the energy storage unit 209 realizes voltage regulation, and the second switch component 211 is kept in a turned-on state, so that the regulated current flows from the voltage transformation module 104 to the battery module 105 at the constant voltage; when the voltage value detected by the voltage detecting unit is smaller than the constant voltage of the battery module 105, the input end of the second switch assembly 211 is connected with the energy storage unit 209 to achieve boosting, the second switch assembly 211 is kept in a conducting state, the energy storage unit 209 is subjected to voltage regulation, and then the second switch assembly 211 is conducted and cut off according to the control signal output by the DC-DC control unit to achieve current regulation, so that the regulated current flows from the voltage transformation module 104 to the battery module 105 at the constant voltage.

It can be obtained that the embodiment of the application realizes the dynamic adjustment of the current and the voltage in the charging circuit 101 through a simple circuit structure, thereby ensuring the stability and the usability of the circuit.

Optionally, the first switch assembly 210 includes a first switch 212 and a second switch 213, and the second switch assembly 211 includes a third switch 214 and a fourth switch 215;

the first switch 212 is connected to a first enable pin of the DC-DC control unit, and is configured to be turned on or off according to a first PWM signal in the control signal;

The second switch 213 is connected to a second enable pin of the DC-DC control unit, and is configured to be turned on or off according to a second PWM signal in the control signal;

The third switch 214 is connected to a third enable pin of the DC-DC control unit, and is configured to be turned on or off according to a third PWM signal in the control signal;

The fourth switch 215 is connected to a fourth enable pin of the DC-DC control unit, and is configured to be turned on or off according to a fourth PWM signal in the control signal.

It should be noted that, in the embodiment of the present application, the first switch component 210 and the second switch component 211 are both formed by connecting two switches in parallel, and when current is adjusted, the two switches connected in parallel alternately oscillate, so that the on and off speeds of the switches can be increased.

Specifically, the DC-DC control unit generates the first PWM signal, the second PWM signal, the third PWM signal, and the fourth PWM signal, that is, PWM1, PWM2, PWM3, and PWM4, according to the PWM signals, and the DC-DC control unit is connected to the first switch 212, the second switch 213, the third switch 214, and the fourth switch 215 through the first enable pin EN1, the second enable pin EN2, the third enable pin EN3, and the fourth enable pin EN4, respectively, so as to control the on and off of the first switch 212, the second switch 213, the third switch 214, and the fourth switch 215, respectively, thereby realizing efficient real-time adjustment of the current in the charging circuit 101.

Optionally, the first switch 212, the second switch 213, the third switch 214, and the fourth switch 215 are N-MOS transistors, and the energy storage unit 209 includes an inductor.

Optionally, the charging circuit 101 further includes a circuit protection module 216;

The circuit protection module 216 is respectively connected to the common interface 102 and the transformation module 104, and is configured to disconnect the charging circuit 101 when the voltage value falls into a preset abnormal threshold.

The circuit protection module 216 is used for protecting the voltage transformation module 104, and may include an overvoltage protection unit, an undervoltage protection unit, a back voltage protection unit, and the like, where the overvoltage protection unit, the undervoltage protection unit, and the back voltage protection unit may be composed of a control MOS and peripheral devices.

Specifically, the overvoltage protection unit is configured to disconnect the charging circuit 101 when the voltage of the charging circuit 101 is greater than a first preset threshold, the undervoltage protection unit is configured to disconnect the charging circuit 101 when the voltage of the charging circuit 101 is less than a second preset threshold, and the back-voltage protection unit is configured to disconnect the charging circuit 101 when the voltage of the charging circuit 101 is negative, where the first preset threshold and the second preset threshold may be set by a related person according to the parameters of the charging circuit 101 and the parameters of the battery module 105.

Optionally, the charging circuit 101 further includes a power supply module 217;

The power supply module 217 is respectively connected with the common interface 102 and the logic control module 103, and is used for supplying power to the logic control module 103.

The power supply module 217 may be composed of LDO and peripheral devices, and its output voltage may be 3.3V.

It can be obtained that the power supply module 217 is connected to the common interface 102, and the charging circuit 101 is simple in structure and convenient to use without obtaining power supply from an external circuit.

Based on the above embodiments, the present application also provides an optional embodiment, which is used for further describing the technical solution of the embodiment of the present application, including:

in the dc charging mode, the dc power is plugged into the common interface 102, the circuit protection module 216 determines the input voltage, and if the input voltage is too high, too low or back-pressure, the circuit protection module 216 operates to prevent the input voltage from flowing to the next stage module, and if the input voltage is normal, the input voltage supplies power to the power supply module 217. The power supply module 217 outputs a 3.3V voltage to the logic control module 103 to supply power to enable the logic control module 103 to work normally, the voltage detection module 206 provides a current input voltage range to the logic control module 103, and the logic control module 103 outputs a high level to the DC-DC control unit to control the DC-DC control unit to perform a voltage conversion state. When the DC input voltage is higher than the constant voltage of the battery module 105, the DC-DC control unit outputs a PWM waveform, the first switch 212 and the second switch 213 are in an alternate oscillation state, the energy storage unit 209 performs energy conversion, and the third switch 214 is turned on to output the constant voltage to charge the battery module 105. When the DC input voltage is lower than the constant voltage of the battery module 105, the DC-DC control unit outputs a PWM waveform, the first switch 212 is turned on, the third switch 214 and the fourth switch 215 are alternately oscillated, the input voltage is converted by the energy storage unit 209, the third switch 214 and the fourth switch 215, and the constant voltage is output to charge the battery module 105.

In the photovoltaic charging mode, the photovoltaic power is plugged into the common interface 102, the circuit protection module 216 determines the input voltage, if the input voltage is too high, too low or back pressure, the circuit protection module 216 acts to prevent the input voltage from flowing to the next stage module, and if the input voltage is normal, the input voltage supplies power to the power supply module 217. The power supply module 217 outputs a 3.3V voltage to the logic control module 103 to supply power to enable the logic control module 103 to work normally, the voltage detection module 206 provides a current input voltage range to the logic control module 103, and the logic control module 103 outputs a high level to the DC-DC control unit to control the DC-DC control unit to perform a voltage conversion state. When the photovoltaic input voltage is higher than the constant voltage of the battery module 105, the DC-DC control unit outputs a PWM waveform, the first switch 212 and the second switch 213 are in an alternate oscillation state, the energy storage unit 209 performs energy conversion, and the third switch 214 is turned on to output the constant voltage to charge the battery module 105. When the input voltage of the photovoltaic is lower than the constant voltage of the battery module 105, the DC-DC control unit outputs a PWM waveform, the first switch 212 is turned on, the third switch 214 and the fourth switch 215 are alternately oscillated, the input voltage is converted by the energy storage unit 209, the third switch 214 and the fourth switch 215, and the constant voltage is output to charge the battery module 105.

The present application provides a charging system of a common interface, comprising a charging circuit 101 of the common interface 102 as described in the first aspect, and a battery module 105 to be charged using the charging circuit 101.

The battery module 105 may be composed of a single battery or a plurality of strings of batteries.

The system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The charging circuit steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The charging circuit of the shared interface is characterized by comprising the shared interface, a logic control module and a transformation module;

the shared interface is used for accessing various target power supplies;

2. The charging circuit of claim 1, wherein the target power source comprises a direct current power source or a photovoltaic power source.

3. The charging circuit of claim 2, further comprising a voltage detection module and a current detection module;

4. A charging circuit according to claim 3, wherein the transformation module comprises a DC-DC control unit and a switching unit;

5. The charging circuit of claim 4, wherein the transformation module further comprises an energy storage unit, the switching unit comprising a first switching assembly and a second switching assembly;

6. The charging circuit of claim 5, wherein the energy storage unit comprises an inductor.

7. The charging circuit of claim 5, wherein the first switch assembly comprises a first switch and a second switch, and the second switch assembly comprises a third switch and a fourth switch;

8. The charging circuit of claim 7, wherein the first switch, the second switch, the third switch, and the fourth switch employ N-MOS transistors.

9. The charging circuit of any one of claims 3-7, further comprising a circuit protection module;

10. The charging circuit of any one of claims 1-7, further comprising a power supply module;

11. A charging system of a common interface, characterized in that the charging system comprises a charging circuit of the common interface according to any one of claims 1-9 and a battery module that is charged using the charging circuit.