CN216390815U

CN216390815U - Power supply circuit and power supply device

Info

Publication number: CN216390815U
Application number: CN202122676954.2U
Authority: CN
Inventors: 陈熙; 刘文强
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-04-26
Anticipated expiration: 2031-11-03

Abstract

The application provides a power supply circuit and power supply unit, this power supply circuit includes wake-up circuit, the BMS circuit, switching circuit and voltage conversion circuit, alternating current power supply is connected to wake-up circuit's input, wake-up circuit's output is connected with the input of BMS circuit, the output of BMS circuit is connected with switching circuit's control end, direct current power supply is connected to switching circuit's first end, switching circuit's second end is connected with voltage conversion circuit, switching circuit is used for when receiving the turn-on signal, switch on the connection between direct current power supply and the voltage conversion circuit, so that direct current power supply exports direct current voltage to voltage conversion circuit, voltage conversion circuit is used for carrying out voltage conversion to direct current voltage and obtains target direct current voltage. The power supply circuit aims to reduce the hardware cost of the power supply circuit and improve the working efficiency of the power supply circuit.

Description

Power supply circuit and power supply device

Technical Field

The application relates to the technical field of power supplies, in particular to a power supply circuit and power supply equipment.

Background

At present, a power supply circuit of a power supply device often needs to provide different power supply voltages for different loads so as to drive other circuits of the power supply device or external devices to work. The power supply voltage can be obtained by inputting direct current from a direct current power supply and performing voltage conversion on the input direct current by a power supply circuit, or can be obtained by inputting alternating current from an alternating current power supply and performing alternating current-direct current conversion and voltage conversion on the input alternating current by the power supply circuit.

However, the power supply circuit supporting ac input and dc input usually needs at least two transformers to implement voltage conversion of the whole circuit, or adopts a dual-input manner of integrated transformer, and the circuit structure designed by these manners is complex, so that the cost of the power supply circuit is higher, and the working efficiency is lower.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a power supply circuit, which aims to reduce the cost of the power supply circuit and improve the working efficiency of the power supply circuit.

In a first aspect, the present application provides a power supply circuit comprising a wake-up circuit, a BMS circuit, a switching circuit, and a voltage conversion circuit;

the input end of the wake-up circuit is connected with an alternating current power supply, the output end of the wake-up circuit is connected with the input end of the BMS circuit, and the wake-up circuit is used for outputting a wake-up signal to the BMS circuit after receiving alternating current voltage input by the alternating current power supply;

the output end of the BMS circuit is connected with the control end of the switch circuit, and the BMS circuit is used for outputting a conducting signal to the switch circuit after receiving the wake-up signal;

the first end of the switch circuit is connected with a direct current power supply, the second end of the switch circuit is connected with the voltage conversion circuit, and the switch circuit is used for conducting the connection between the direct current power supply and the voltage conversion circuit when receiving the conducting signal so that the direct current power supply outputs direct current voltage to the voltage conversion circuit;

the voltage conversion circuit is used for performing voltage conversion on the direct-current voltage to obtain a target direct-current voltage.

In one embodiment, the voltage conversion circuit comprises a flyback transformer, a direct current input unit and at least one rectifying and voltage stabilizing unit;

the flyback transformer comprises a primary winding and at least one secondary winding;

the input end of the direct current input unit is connected with the second end of the switch circuit, the output end of the direct current input unit is connected with the primary winding, and the direct current input unit is used for converting the direct current voltage into alternating voltage applied to the primary winding;

the rectification voltage-stabilizing unit is connected with the corresponding secondary winding and is used for converting the induced voltage obtained by coupling the secondary winding from the primary winding into target direct-current voltage.

In one embodiment, the direct current input unit comprises an anti-reverse module, a switch module and a switch control module;

the input end of the anti-reverse module is connected with the second end of the switch circuit, the output end of the anti-reverse module is connected with the first end of the primary winding, and the anti-reverse module is used for outputting the direct-current voltage to the first end of the primary winding and preventing current from flowing backwards to the switch circuit;

the first end of the switch module is connected with the second end of the primary winding, the second end of the switch module is grounded, and the control end of the switch module is connected with the switch control module;

the switch control module is used for controlling the duty ratio of the switch module so that the switch module outputs alternating voltage to the primary winding.

In one embodiment, the anti-reverse module comprises a first diode, a second diode and a third diode;

the anode of the first diode is connected with the first input end of the anti-reverse module, and the cathode of the first diode is connected with the anode of the third diode;

the anode of the second diode is connected with the second input end of the anti-reverse module, and the cathode of the second diode is connected with the anode of the third diode;

the cathode of the third diode is connected with the first end of the primary winding;

the second end of the switch circuit is connected with the first input end of the anti-reverse module and the second input end of the anti-reverse module, and the switch circuit is further used for conducting the connection between the first direct-current power supply and the first input end of the anti-reverse module or conducting the connection between the second direct-current power supply and the second input end of the anti-reverse module according to the conducting signal.

In one embodiment, the rectifying and voltage-stabilizing unit includes a fourth diode, a first capacitor, a voltage stabilizer and a second capacitor;

the anode of the fourth diode is connected with the first end of the secondary winding, and the cathode of the fourth diode is connected with the first end of the voltage stabilizer;

a first end of the first capacitor is connected with a cathode of the fourth diode, a second end of the first capacitor is connected with a second end of the secondary winding, and the second end of the secondary winding is connected with a first output end of the rectifying and voltage-stabilizing unit;

the second end of the voltage stabilizer is connected with the second output end of the rectification voltage-stabilizing unit;

the second capacitor is connected between the first output end and the second output end of the rectifying and voltage-stabilizing unit.

In an embodiment, the rectifying and voltage-stabilizing unit includes a fifth diode, a third capacitor, a BUCK chip, a first inductor and a fourth capacitor;

the anode of the fifth diode is connected with the first end of the secondary winding, and the cathode of the fifth diode is connected with the first end of the BUCK chip;

a first end of the third capacitor is connected with a cathode of the fifth diode, and a second end of the third capacitor is connected with a second end of the secondary winding;

the second end of the BUCK chip is connected with the second end of the secondary winding, the third end of the BUCK chip is connected with the first end of the first inductor, and the fourth end of the BUCK chip is connected with the first output end of the rectifying and voltage-stabilizing unit;

the second end of the first inductor is connected with the second output end of the rectifying and voltage-stabilizing unit;

the fourth capacitor is connected between the first output end and the second output end of the rectifying and voltage-stabilizing unit;

and a third output end of the rectifying and voltage stabilizing unit is connected with a cathode of the fifth diode.

In one embodiment, the power supply circuit further comprises an inverter circuit, and the voltage conversion circuit comprises a first BUCK unit, a second BUCK unit and a third BUCK unit;

the first end of the first BUCK unit is connected with the second end of the switch circuit, and the second end of the first BUCK unit is connected with the first output interface of the voltage conversion circuit;

the first end of the second BUCK unit is connected with the second end of the first BUCK unit, and the second end of the second BUCK unit is connected with the second output interface of the voltage conversion circuit;

the first BUCK unit is used for performing voltage conversion on the direct-current voltage to obtain a first target direct-current voltage, and the second BUCK unit is used for performing voltage conversion on the first target direct-current voltage to obtain a second target direct-current voltage;

the first end of the third BUCK unit is used for being connected with the inverter circuit, and the second end of the third BUCK unit is used for being connected with a third output interface of the voltage conversion circuit;

the inverter circuit is connected with the alternating current power supply and used for converting alternating current output by the alternating current power supply into direct current and transmitting the direct current to the third BUCK unit;

the third BUCK unit is configured to convert a voltage of the direct current to a third target direct current voltage.

In an embodiment, the first BUCK unit includes a first BUCK chip, a sixth diode, a second inductor and a fifth capacitor; the second BUCK unit comprises a second BUCK chip, a third inductor and a sixth capacitor;

the first end of the first BUCK chip is connected with the second end of the switch circuit, the second end of the first BUCK chip is grounded, the third end of the first BUCK chip is connected with the anode of the first output interface through the second inductor, and the fourth end of the first BUCK chip is connected with the cathode of the first output interface;

the cathode of the sixth diode is connected with the third end of the first BUCK chip, and the anode of the sixth diode is connected with the fourth end of the first BUCK chip;

the fifth capacitor is connected between the anode and the cathode of the first output interface;

the first end of the second BUCK chip is connected with the positive electrode of the first output interface, the second end of the second BUCK chip is connected with the negative electrode of the first output interface, the third end of the second BUCK chip is connected with the positive electrode of the second output interface through the third inductor, and the fourth end of the second BUCK chip is connected with the negative electrode of the second output interface;

and the sixth capacitor is connected between the anode and the cathode of the second output interface.

In one embodiment, the wake-up circuit comprises a seventh diode, a first resistor, a second resistor, a seventh capacitor, a photoelectric coupler and a third resistor;

the anode of the seventh diode is connected with the alternating current power supply, the cathode of the seventh diode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the first end of the photoelectric coupler;

the first end of the second resistor is connected with the second end of the first resistor, the second end of the second resistor is grounded, and the seventh capacitor is connected with the second resistor in parallel;

the second end of the photoelectric coupler is grounded, the third end of the photoelectric coupler is connected with the direct-current power supply through the third resistor, and the fourth end of the photoelectric coupler is connected with the first end of the BMS circuit.

In a second aspect, an embodiment of the present application further provides a power supply device, including the power supply circuit according to any one of the embodiments and at least one dc output interface, where the dc output interface is connected to the power supply circuit, and the dc output interface is configured to output a target dc voltage converted by the power supply circuit.

The application provides a power supply circuit and power supply equipment, the power supply circuit comprises a wake-up circuit, a BMS circuit, a switch circuit and a voltage conversion circuit, the input end of the wake-up circuit is connected with an alternating current power supply, the output end of the wake-up circuit is connected with the input end of the BMS circuit, the wake-up circuit is used for receiving the alternating current voltage input by the alternating current power supply, the output end of the BMS circuit is connected with the control end of the switch circuit, the BMS circuit is used for outputting a wake-up signal to the BMS circuit, outputting a conducting signal to a switch circuit, wherein the first end of the switch circuit is connected with the direct current power supply, the second end of the switch circuit is connected with the voltage conversion circuit, the switch circuit is used for conducting the connection between the direct current power supply and the voltage conversion circuit when receiving the conducting signal, so that the direct current power supply outputs direct current voltage to the voltage conversion circuit, and the voltage conversion circuit is used for performing voltage conversion on the direct current voltage to obtain target direct current voltage. Through wake-up circuit, BMS circuit and switch circuit, control DC power supply output DC voltage after receiving the AC voltage of AC power supply input to need not to supply power through AC power supply circuit, circuit structure is simple, can effectively reduce the hardware cost, has also improved supply circuit's work efficiency simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a circuit schematic diagram of an implementation manner of a power supply circuit provided in an embodiment of the present application;

fig. 2 is a circuit diagram of an embodiment of a wake-up circuit according to the present disclosure;

fig. 3 is a circuit diagram of an embodiment of a voltage converting circuit according to an embodiment of the present disclosure;

fig. 4 is a circuit schematic diagram of another implementation of a voltage converting circuit provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of the voltage converting circuit of FIG. 3 according to an embodiment of the present disclosure;

FIG. 6 is a circuit diagram of the voltage converting circuit of FIG. 4 according to an embodiment of the present disclosure;

fig. 7 is a circuit schematic diagram of another implementation of a power supply circuit provided in an embodiment of the present application;

fig. 8 is a schematic diagram of a power supply circuit of a voltage conversion circuit according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of the voltage converting circuit of FIG. 8 according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a power supply apparatus according to an embodiment of the present application.

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, fig. 1 is a circuit schematic diagram of an implementation manner of a power supply circuit provided in an embodiment of the present application. The power supply circuit 100 may be used for a power supply apparatus. The power supply device may or may not include an energy storage device, such as a rechargeable battery or a non-rechargeable battery, for example, the power supply device may obtain electric energy from the outside, such as from a power grid, a generator, an energy storage device connected to the power supply device, a solar battery, and the like.

As shown in fig. 1, the power supply circuit 100 includes a wake-up circuit 110, a BMS circuit 120, a switching circuit 130, and a voltage conversion circuit 140.

The input end of the wake-up circuit 110 is connected to the ac power supply 201, the output end of the wake-up circuit 110 is connected to the input end of the BMS circuit 120, and the wake-up circuit 110 is configured to output a wake-up signal to the BMS circuit 120 after receiving an ac voltage input by the ac power supply 201. The ac power supply 201 is used to supply ac power, such as commercial power.

Illustratively, as shown in fig. 2, the wake-up circuit 110 includes a filter circuit 111 and an isolation circuit 112. The input end of the filter circuit 111 is used for connecting the alternating current power supply 201, and the output end of the filter circuit 111 is connected with the input end of the isolation circuit 112; the output terminal of the isolation circuit 112 is connected to the input terminal of the BMS circuit 120, and the isolation circuit 112 is configured to isolate the ac voltage GRID _ L output by the ac power supply 201 to generate the wake-BMS wake signal and output the wake-BMS wake signal to the BMS circuit 120.

In one embodiment, as shown in fig. 2, the wake-up circuit 110 includes a seventh diode D7, a first resistor R1, a second resistor R2, a seventh capacitor C7, a photo coupler U1, and a third resistor R3.

An anode of the seventh diode D7 is connected to the ac power supply 201, a cathode of the seventh diode D7 is connected to a first end of the first resistor R1, and a second end of the first resistor R1 is connected to a first end of the photocoupler U1; a first end of the second resistor R2 is connected with a second end of the first resistor R1, a second end of the second resistor R2 is grounded GRID _ N, and the seventh capacitor C7 is connected in parallel with the second resistor R2; a second terminal of the photocoupler U1 is grounded GRID _ N, a third terminal of the photocoupler U1 is connected to the dc power supply 202 through a third resistor R3, and a fourth terminal of the photocoupler U1 is connected to an input terminal of the BMS circuit 120.

Illustratively, the seventh diode D7 and the first resistor R1 are used for receiving the ac voltage GRID _ L input by the ac power supply 201, and the seventh capacitor C7 and the second resistor R2 are used for filtering the ac voltage GRID _ L. The dc power supply 202 supplies a preset voltage BAT + to a third terminal of the photocoupler U1, and the photocoupler U1 serves to photoelectrically isolate the ac voltage GRID _ L and transmits a wake-BMS signal for activating the BMS circuit 120 to the BMS circuit 120.

In one embodiment, as shown in fig. 1 and 2, the output terminal of the BMS circuit 120 is connected to the control terminal of the switch circuit 130, and the BMS circuit 120 is configured to generate a turn-on signal upon receiving the wake-up signal output by the wake-up circuit 110 and output the turn-on signal to the switch circuit 130.

The BMS circuit 120 is a related circuit of a Battery Management System (BMS), and the switching circuit 130 can be controlled to be turned on or off by the BMS circuit 120. The BMS circuit 120 starts operating according to the received wake-up signal, and controls the dc power supply 202 to input the dc voltage to the switching circuit 130 after the BMS circuit 120 starts operating.

In an embodiment, as shown in fig. 1, a first terminal of the switch circuit 130 is connected to the dc power source 202, a second terminal of the switch circuit 130 is connected to the voltage conversion circuit 140, and the switch circuit 130 is configured to turn on the connection between the dc power source 202 and the voltage conversion circuit 140 when receiving the turn-on signal, so that the dc power source 202 outputs the dc voltage to the voltage conversion circuit 140.

The switch circuit 130 includes, for example, a triode switch circuit, a field effect transistor switch circuit, a mechanical switch circuit, or the like, which is not limited in this embodiment. The dc power source 202 is used for providing dc voltage, and the dc power source 202 includes, for example, a battery module including one or more electric energy storage units, such as one or more batteries. A plurality of batteries can be connected in series and parallel to form the battery module.

In an embodiment, the voltage conversion circuit 140 is configured to perform voltage conversion on the dc voltage output by the dc power supply 202 to obtain a target dc voltage, where the target dc voltage may be one or more, and the target dc voltages may be equal to or unequal to each other.

Illustratively, the wake-up circuit 110 sends a wake-up signal to the BMS circuit 120 to activate the BMS circuit 120 after receiving the ac voltage input by the ac power supply 201, and the BMS circuit 120 outputs a turn-on signal to the control terminal of the switching circuit 130 after activation to control the first terminal and the second terminal of the switching circuit 130 to be connected, so that the dc power supply 202 outputs a dc voltage to the voltage conversion circuit 140, so that the voltage conversion circuit 140 performs voltage conversion on the dc voltage output by the dc power supply 202 to obtain one or more target dc voltages, and the target dc voltage is output to other circuits or loads by the voltage conversion circuit 140. The power supply circuit 100 provided by the embodiment of the application does not need to supply power through a traditional AC power supply circuit, has a simple circuit structure, can rapidly output a target direct current voltage, and improves the working efficiency of the power supply circuit 100.

In one embodiment, as shown in fig. 3 and 4, the voltage conversion circuit 140 includes a flyback transformer 141, a dc input unit 142, and a rectifying and voltage stabilizing unit 143. It is understood that the number of the rectifying and voltage stabilizing units 143 may be one or more.

Wherein the flyback transformer 141 includes a primary winding 1411 and at least one secondary winding 1412; an input end of the dc input unit 142 is connected to the second end of the switching circuit 130, an output end of the dc input unit 142 is connected to the primary winding 1411, and the dc input unit 142 is configured to convert a dc voltage into an alternating voltage applied to the primary winding 1411; the rectifying and voltage-stabilizing unit 143 is connected to the corresponding secondary winding 1412, and the rectifying and voltage-stabilizing unit 143 is configured to convert the induced voltage, which is obtained by coupling the secondary winding 1412 with the primary winding 1411, into a target dc voltage.

When the switching circuit 130 is connected, the dc power supply 202 inputs a dc voltage to the input terminal of the dc input unit 142 through the switching circuit 130, so that the dc input unit 142 converts the dc voltage into an alternating voltage applied to the primary winding 1411, and the rectifying and voltage stabilizing unit 143 is coupled through the corresponding secondary winding 1412, converts the coupled induced voltage into a target dc voltage, and outputs the target dc voltage.

In some embodiments, the number of turns of the at least one secondary winding 1412 may be equal or unequal, and accordingly, the target dc voltage output by the at least one rectifying and voltage stabilizing unit 143 may be equal or unequal. For example, the target dc voltages include 5V, 12V, and 15V.

In some embodiments, the rectifying and voltage-stabilizing unit 143 may rectify and stabilize the alternating voltage coupled from the secondary winding 1412 into a direct current, or may rectify and stabilize the alternating voltage coupled from the secondary winding 1412 into an alternating current having a constant waveform.

In some embodiments, the installation location of the wake-up circuit 110 is determined according to the installation location of the flyback transformer 141. As shown in fig. 3 and 4, the dashed line portion in the flyback transformer 141 is a isolation band, the left side of the isolation band is a primary side, and the right side of the isolation band is a secondary side. The input end of the wake-up circuit 110 is located on the primary side, the input end of the wake-up circuit 110 includes a positive electrode L and a negative electrode N, the output end of the wake-up circuit 110 is located on the secondary side, and the output end of the wake-up circuit 110 is connected to the BMS circuit 120 for outputting a wake-BMS wake-up signal. The output end of the wake-up circuit 110 is arranged on the secondary side with lower voltage, so that the voltage-resistant requirements on the wake-up circuit 110 and the BMS circuit 120 are reduced, and reasonable control hardware cost is facilitated.

In one embodiment, as shown in fig. 5 and 6, the dc input unit 142 includes a reverse prevention module 1421, a switch module 1422, and a switch control module 1423.

The input end of the anti-reverse module 1421 is connected to the second end of the switch circuit 130, the output end of the anti-reverse module 1421 is connected to the first end of the primary winding 1411, and the anti-reverse module 1421 is configured to output a dc voltage to the first end of the primary winding 1411, and further configured to prevent a current from flowing backward to the switch circuit 130; a first end of the switch module 1422 is connected to the second end of the primary winding 1411, a second end of the switch module 1422 is grounded, and a control end of the switch module 1422 is connected to the switch control module 1423; the switching control module 1423 is used to control the duty cycle of the switching module 1422 such that the switching module 1422 outputs an alternating voltage to the primary winding 1411.

The switch module 1422 includes a switch element such as a switch tube, a relay, and the like, the switch tube is, for example, an MOS tube, and the switch control module 1423 includes a turn-off chip and a peripheral circuit thereof, which is certainly not limited thereto. In some embodiments, the switch control module 1423 may also be another processor for providing calculation and control capability, such as a micro control unit MCU, which is not specifically limited in this embodiment.

Illustratively, the switch control module 1423 outputs a PWM signal to control the switch of the switch module 1422, the flyback transformer 141 stores and discharges energy, and the rectifying and voltage-stabilizing unit 143 is configured to convert the coupled induced voltage into a 15V/12V/5V voltage to supply power to other circuits, so as to meet the power consumption requirement of the other circuits for the 15V/12V/5V voltage.

In one embodiment, as shown in fig. 5 and 6, the anti-reverse module 1421 includes a first diode D1, a second diode D2, and a third diode D3. The anode of the first diode D1 is connected to the first input terminal of the anti-reverse module 1421, and the cathode of the first diode D1 is connected to the anode of the third diode D3; the anode of the second diode D2 is connected to the second input terminal of the anti-reverse module 1421, and the cathode of the second diode D2 is connected to the anode of the third diode D3; the cathode of the third diode D3 is connected to the first end of the primary winding 1411; the second end of the switch circuit 130 is connected to the first input end of the anti-reverse module 1421 and the second input end of the anti-reverse module 1421, and the switch circuit 130 is further configured to conduct, according to the conduction signal, the connection between the first dc power supply and the first input end of the anti-reverse module 1421, or conduct the connection between the second dc power supply and the second input end of the anti-reverse module 1421.

Illustratively, the first dc power supply is, for example, a battery, and a dc voltage BAT + is input to the first input terminal of the battery reverse prevention module 1421; the second dc power source is, for example, a solar panel, and a dc voltage PV + is input to the second input terminal of the anti-reverse module 1421 through the solar panel. The first direct-current power supply or the second direct-current power supply can be selectively connected, the direct-current power supplies of different types can be supplied, and the reverse flow of current is prevented through the reverse prevention module 1421, so that the direct-current power supplies are protected.

In some embodiments, the anti-reverse module 1421 further includes a capacitor C8, one end of the capacitor C8 is connected to the cathode of the third diode D3, and the other end is grounded, so that the dc voltage input to the anti-reverse module 1421 is filtered through the capacitor C8, and the voltage stabilizing effect and the quality of the output dc power can be improved.

In one embodiment, as shown in fig. 5 and 6, the rectifying and voltage stabilizing unit 143 includes a fourth diode D4, a first capacitor C1, a voltage regulator, and a second capacitor C2; the anode of the fourth diode D4 is connected with the first end of the secondary winding 1412, and the cathode of the fourth diode D4 is connected with the first end of the voltage stabilizer; a first end of the first capacitor C1 is connected with the cathode of the fourth diode D4, a second end of the first capacitor C1 is connected with a second end of the secondary winding 1412, and a second end of the secondary winding 1412 is connected with a first output end of the rectifying and voltage-stabilizing unit 143; the second end of the voltage stabilizer is connected with the second output end of the rectifying and voltage stabilizing unit 143; the second capacitor C2 is connected between the first output terminal and the second output terminal of the rectifying and voltage-stabilizing unit 143.

The first output terminal of the rectifying and voltage-stabilizing unit 143 is configured to output a target dc voltage V1, the second output terminal of the rectifying and voltage-stabilizing unit 143 is grounded, and the target dc voltage V1 is, for example, 15V.

In an embodiment, as shown in fig. 5, the rectifying and voltage stabilizing unit 143 includes a fifth diode D5, a third capacitor C3, a BUCK chip, a first inductor L1, and a fourth capacitor C4; the anode of the fifth diode D5 is connected with the first end of the secondary winding 1412, and the cathode of the fifth diode D5 is connected with the first end of the BUCK chip; a first end of the third capacitor C3 is connected with the cathode of the fifth diode D5, and a second end of the third capacitor C3 is connected with a second end of the secondary winding 1412; a second end of the BUCK chip is connected with a second end of the secondary winding 1412, a third end of the BUCK chip is connected with a first end of the first inductor L1, and a fourth end of the BUCK chip is connected with a first output end of the rectifying and voltage-stabilizing unit 143; a second end of the first inductor L1 is connected to a second output end of the rectifying and voltage-stabilizing unit 143; the fourth capacitor C4 is connected between the first output terminal and the second output terminal of the rectifying and voltage-stabilizing unit 143; a third output terminal of the rectifying and voltage stabilizing unit 143 is connected to a cathode of the fifth diode D5.

The first output terminal of the rectifying and voltage-stabilizing unit 143 is configured to output a target dc voltage V3, the target dc voltage V3 is, for example, 5V, the second output terminal of the rectifying and voltage-stabilizing unit 143 is grounded, the third output terminal of the rectifying and voltage-stabilizing unit 143 is configured to output a target dc voltage V2, and the target dc voltage V2 is, for example, 12V.

In one embodiment, as shown in fig. 6, the rectifying and voltage stabilizing unit 143 includes a diode D8 and a capacitor C9. The anode of the diode D8 is connected to the first end of the secondary winding 1412, and the cathode of the diode D8 is connected to the first output end of the rectifying and voltage-stabilizing unit 143; a first terminal of the capacitor C9 is connected to the cathode of the diode D8, and a second terminal of the capacitor C9 is connected to the second output terminal of the rectifying and voltage-stabilizing unit 143.

The first output terminal of the rectifying and voltage-stabilizing unit 143 is configured to output a target dc voltage V2, the target dc voltage V2 is, for example, 12V, and the second output terminal of the rectifying and voltage-stabilizing unit 143 is grounded.

It should be noted that, compared with fig. 5, the flyback transformer 141 in fig. 6 has a set of secondary windings 1412 and corresponding rectifying and voltage stabilizing units 143 in addition to the BUCK chip in fig. 5, so that the hardware cost can be reduced.

In one embodiment, as shown in fig. 6, the rectifying and voltage stabilizing unit 143 includes a diode D9, a capacitor C10, and a capacitor C11. The anode of the diode D9 is connected to the first end of the secondary winding 1412, and the cathode of the diode D9 is connected to the first end of the regulator; the second end of the voltage stabilizer is connected with the first output end of the rectifying and voltage stabilizing unit 143; a first end of the capacitor C10 is connected with the cathode of the diode D9, and a second end of the capacitor C10 is connected with a second output end of the rectifying and voltage-stabilizing unit 143; the capacitor C11 is connected between the first output terminal and the second output terminal of the rectifying and voltage-stabilizing unit 143. The first output terminal of the rectifying and voltage-stabilizing unit 143 is configured to output a target dc voltage V3, the target dc voltage V3 is, for example, 5V, and the second output terminal of the rectifying and voltage-stabilizing unit 143 is grounded.

It should be noted that, in the voltage conversion circuit 140 provided in fig. 5 and fig. 6, the flyback transformer 141 used can realize multi-power supply by using fewer windings, the process is simple, the size is small, and compared with the flyback transformer used in the prior art, 2 windings are omitted, and the hardware cost is reduced.

Please refer to fig. 7 and 8. As shown in fig. 7, the power supply circuit 100 further includes an inverter circuit 150, and the inverter circuit 150 is connected to the input terminal of the voltage conversion circuit 140. As shown in fig. 8, the voltage conversion circuit 140 includes a first BUCK unit 141, a second BUCK unit 142, and a third BUCK unit 143.

A first end of the first BUCK unit 141 is connected to a second end of the switch circuit 130, and a second end of the first BUCK unit 141 is connected to the first output interface of the voltage conversion circuit 140; a first end of the second BUCK unit 142 is connected with a second end of the first BUCK unit 141, and a second end of the second BUCK unit 142 is connected with the second output interface of the voltage conversion circuit 140; the first BUCK unit 141 is configured to perform voltage conversion on the dc voltage to obtain a first target dc voltage, and the second BUCK unit 142 is configured to perform voltage conversion on the first target dc voltage to obtain a second target dc voltage; a first end of the third BUCK unit 143 is used for connecting the inverter circuit 150, and a second end of the third BUCK unit 143 is used for connecting the third output interface of the voltage conversion circuit 140; the inverter circuit 150 is connected to the ac power supply 201, and is configured to convert ac power output by the ac power supply 201 into dc power and transmit the dc power to the third BUCK unit 143; the third BUCK unit 143 is configured to convert a voltage of the direct current into a third target direct current voltage.

It should be noted that the first output interface is configured to output a first target dc voltage V1, the second output interface is configured to output a second target dc voltage V2, and the third output interface is configured to output a third target dc voltage V3. The first target dc voltage V1, the second target dc voltage V2, and the third target dc voltage V3 may be set according to actual conditions, for example, the first target dc voltage V1 is set to 12V, the second target dc voltage V2 is set to 5V, and the third target dc voltage V3 is set to 15V.

Illustratively, when the wake-up circuit 110 outputs the wake-up signal to activate the BMS circuit 120, the BMS circuit 120 controls the switching circuit 130 to be turned on, thereby allowing the dc power supply 202 to provide input sources for the first BUCK unit 141 and the second BUCK unit 142. The first BUCK unit 141 and the second BUCK unit 142 can supply power to other circuits when they are normally operated. Compared with the voltage conversion circuit 140 shown in fig. 5 and 6, the flyback transformer 141 is reduced, and the circuit adopts an integrated chip, so that the circuit has a great advantage in volume, and meanwhile, the circuit has a simple structure and also has a great advantage in hardware cost.

In an embodiment, as shown in fig. 9, the first BUCK unit 141 includes a first BUCK chip, a sixth diode D6, a second inductor L2, and a fifth capacitor C5; the second BUCK unit 142 includes a second BUCK chip, a third inductor L3, and a sixth capacitor C6. The second inductor L2 and the fifth capacitor C5 are used for stabilizing and filtering the first target dc voltage V1, and the third inductor L3 and the sixth capacitor C6 are used for stabilizing and filtering the second target dc voltage V2.

A first end of the first BUCK chip is connected to the second end of the switch circuit 130, the second end of the first BUCK chip is grounded, a third end of the first BUCK chip is connected to the anode of the first output interface of the voltage conversion circuit 140 through the second inductor L2, and a fourth end of the first BUCK chip is connected to the cathode of the first output interface of the voltage conversion circuit 140; the cathode of the sixth diode D6 is connected with the third end of the first BUCK chip, and the anode of the sixth diode D6 is connected with the fourth end of the first BUCK chip; the fifth capacitor C5 is connected between the positive electrode and the negative electrode of the first output interface; the first end of the second BUCK chip is connected with the positive electrode of the first output interface, the second end of the second BUCK chip is connected with the negative electrode of the first output interface, the third end of the second BUCK chip is connected with the positive electrode of the second output interface through a third inductor L3, and the fourth end of the second BUCK chip is connected with the negative electrode of the second output interface; the sixth capacitor C6 is connected between the positive and negative poles of the second output interface.

In some embodiments, the first terminal of the first BUCK chip is connected to the second terminal of the switching circuit 130 through the diode D11 or the diode D12. The switch circuit 130 is configured to switch on a connection between the first dc power source and the first terminal of the first BUCK chip, or switch on a connection between the second dc power source and the first terminal of the first BUCK chip according to the switch-on signal.

Illustratively, the first dc power supply is, for example, a storage battery, and the dc voltage BAT + is input to the first end of the first BUCK chip through the storage battery; the second dc power source is, for example, a solar panel, and the dc voltage PV + is input to the first end of the first BUCK chip through the solar panel. The first direct-current power supply or the second direct-current power supply can be selectively connected, different types of direct-current power supplies can be supplied, and meanwhile, the current is prevented from flowing backwards through the diode D11 or the diode D12, so that the direct-current power supply is protected.

In an embodiment, as shown in fig. 9, the third BUCK unit 143 includes a third BUCK chip, a diode D10, an inductor L4, and a capacitor C12. The first end of the third BUCK chip is connected with the positive electrode BUS + of the output end of the inverter circuit 150, the second end of the third BUCK chip is connected with the negative electrode BUS-of the output end of the inverter circuit 150, the third end of the third BUCK chip is connected with the positive electrode of the third output interface of the voltage conversion circuit 140 through an inductor L4, and the fourth end of the third BUCK chip is connected with the negative electrode of the third output interface of the voltage conversion circuit 140; the cathode of the diode D10 is connected with the third end of the third BUCK chip, and the anode of the diode D10 is connected with the fourth end of the third BUCK chip; the capacitor C12 is connected between the positive and negative electrodes of the third output interface. The third output interface is configured to output a third target dc voltage V3, where the third target dc voltage V3 is, for example, 15V.

Illustratively, the main power board includes an inverter circuit 150, the main power board is connected to an ac power source 201, and when the ac power source 201 outputs an ac voltage to the main power board, the ac power source 201 activates the main power board and the inverter circuit 150 converts the ac voltage into a dc voltage BUS +/BUS-to output the dc voltage BUS +/BUS-to the third BUCK unit 143. The third BUCK unit 143 converts the BUS +/BUS-to output a 15V working voltage, which serves as a system power supply of the high-voltage part of the main power board, so as to ensure the normal operation of the high-voltage part of the main power board.

The BUS +/BUS is a voltage output by the ac power supply 201 after the ac power supply 201 inputs the main power board, that is, when the ac power supply 201 inputs an ac voltage to the main power board, a voltage is output, and the voltage is not an operating voltage of the main power board. In fig. 9, the voltage BUS +/BUS-output by the main power board is converted by the third BUCK chip to obtain a voltage of 15V, and the voltage of 15V is used as the working voltage of the main power board.

In some embodiments, the installation location of the wake-up circuit 110 is determined according to the installation location of the voltage conversion circuit 140. The dotted line portion shown in fig. 9 is a barrier, the left side of the barrier is a primary side, and the right side of the barrier is a secondary side. The third BUCK unit 143 in the voltage conversion circuit 140 is located at the primary side, and the first BUCK unit 141 and the second BUCK unit 142 are located at the secondary side. The input end of the wake-up circuit 110 is connected to the ac power supply 201, the input end of the wake-up circuit 110 includes an anode L and a cathode N, and the output end of the wake-up circuit 110 is connected to the BMS circuit 120 for outputting a wake-BMS wake signal. Settle in the lower secondary side of voltage through the output with awakening circuit 110, reduced the withstand voltage requirement to awakening circuit 110 and BMS circuit 120, reduced awakening circuit 110 and BMS circuit 120's material requirement, enlarged awakening circuit 110 and BMS circuit 120's material selection space, be favorable to reasonable control hardware cost.

The power supply circuit 100 according to the above embodiment includes a wake-up circuit 110, a BMS circuit 120, a switching circuit 130, and a voltage conversion circuit 140, wherein an input terminal of the wake-up circuit 110 is connected to an ac power supply 201, an output terminal of the wake-up circuit 110 is connected to an input terminal of the BMS circuit 120, the wake-up circuit 110 is configured to output a wake-up signal to the BMS circuit 120 upon receiving an ac voltage input from the ac power supply 201, an output terminal of the BMS circuit 120 is connected to a control terminal of the switching circuit 130, the BMS circuit 120 is configured to output a turn-on signal to the switching circuit 130 upon receiving the wake-up signal, a first terminal of the switching circuit 130 is connected to the dc power supply 202, a second terminal of the switching circuit 130 is connected to the voltage conversion circuit 140, the switching circuit 130 is configured to turn on the connection between the dc power supply 202 and the voltage conversion circuit 140 upon receiving the turn-on signal, so that the dc power supply 202 outputs a dc voltage to the voltage conversion circuit 140, the voltage conversion circuit 140 is configured to perform voltage conversion on the dc voltage to obtain a target dc voltage. Through wake-up circuit 110, BMS circuit 120 and switching circuit 130, control DC power supply 202 output DC voltage after receiving the AC voltage of AC power supply 201 input to need not to supply power through AC power supply circuit, circuit structure is simple, can effectively reduce the hardware cost, has also improved supply circuit 100's work efficiency simultaneously.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a power supply apparatus according to an embodiment of the present disclosure.

As shown in fig. 10, the power supply device 300 includes:

the power supply circuit 100 described in the above embodiment;

at least one dc output interface 200 connected to the power supply circuit 100, where the dc output interface 200 is configured to output a target dc voltage converted by the power supply circuit 100.

The power supply apparatus 300 according to the above embodiment includes a power supply circuit 100 and at least one dc output interface 200, wherein the power supply circuit 100 includes a wake-up circuit 110, a BMS circuit 120, a switching circuit 130, and a voltage conversion circuit 140. Through wake-up circuit 110, BMS circuit 120 and switch circuit 130, control DC power supply 202 output DC voltage after receiving the AC voltage of AC power supply 201 input to need not to supply power through AC power supply circuit, circuit structure is simple, can effectively reduce the hardware cost, and the target DC voltage that obtains through DC output interface 200 output power supply circuit 100 conversion has improved power supply unit 300's work efficiency simultaneously.

Those skilled in the art will appreciate that the configuration shown in fig. 10 is a block diagram of only a portion of the configuration associated with the embodiments of the present application, and does not constitute a limitation on the power supply circuit to which the embodiments of the present application are applied, and a particular power supply circuit may include more or less components than those shown in the drawings, or may combine some components, or have a different arrangement of components.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The above disclosure provides many different embodiments or examples for implementing different structures of the application. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such 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 addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present application are intended to be covered by the present application.

Claims

1. A power supply circuit is characterized by comprising a wake-up circuit, a BMS circuit, a switching circuit and a voltage conversion circuit;

2. The power supply circuit of claim 1, wherein the voltage conversion circuit comprises a flyback transformer, a dc input unit, and at least one rectifying and voltage stabilizing unit;

3. The power supply circuit according to claim 2, wherein the direct current input unit comprises a reverse prevention module, a switch module and a switch control module;

4. The power supply circuit of claim 3, wherein the anti-reverse module comprises a first diode, a second diode, and a third diode;

5. The power supply circuit according to claim 2, wherein the rectifying and voltage-stabilizing unit comprises a fourth diode, a first capacitor, a voltage regulator and a second capacitor;

6. The power supply circuit according to claim 2, wherein the rectifying and voltage-stabilizing unit comprises a fifth diode, a third capacitor, a BUCK chip, a first inductor and a fourth capacitor;

7. The power supply circuit according to claim 1, wherein the power supply circuit further comprises an inverter circuit, and the voltage conversion circuit includes a first BUCK unit, a second BUCK unit, and a third BUCK unit;

8. The power supply circuit of claim 7 wherein the first BUCK unit includes a first BUCK chip, a sixth diode, a second inductor, and a fifth capacitor; the second BUCK unit comprises a second BUCK chip, a third inductor and a sixth capacitor;

9. The power supply circuit according to any one of claims 1-8, wherein the wake-up circuit comprises a seventh diode, a first resistor, a second resistor, a seventh capacitor, a photocoupler, and a third resistor;

10. A power supply apparatus, characterized by comprising:

the power supply circuit of any one of claims 1-9;

and the direct current output interface is connected with the power supply circuit and used for outputting the target direct current voltage converted by the power supply circuit.