CN216016507U

CN216016507U - Power supply circuit and charging device

Info

Publication number: CN216016507U
Application number: CN202121580265.5U
Authority: CN
Inventors: 林建良; 杨小兵
Original assignee: Foshan Shunde Guangyuda Power Supply Co
Current assignee: Foshan Shunde Guangyuda Power Supply Co
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-03-11
Anticipated expiration: 2031-07-12

Abstract

The application discloses power supply circuit and charging device generates direct current's mains voltage according to AC input voltage through power module, and drive module carries out the step-up of rated voltage numerical value in order to generate driving voltage to mains voltage for driving voltage is unchangeable with mains voltage's voltage difference, and the driving voltage who is used in switch module changes along with mains voltage changes, so that switching-on of switch module can not be influenced in mains voltage's change. Therefore, floating connection of the switch module is not needed, non-common ground processing of the driving voltage and the power supply voltage is not needed, the driving voltage and the power supply voltage are not needed to be isolated from each other, the number of the power supply modules needed by the power supply circuit is effectively reduced, and the size of the power supply circuit is reduced while the cost of the power supply circuit is reduced.

Description

Power supply circuit and charging device

Technical Field

The application belongs to the technical field of electronic circuits, and particularly relates to a power supply circuit and a charging device.

Background

In a conventional power supply circuit, when a switching unit of the power supply circuit is connected in series to a positive terminal of an electric load, a source of the switching unit changes with a change in a power supply voltage. In the conventional scheme, the switch unit is turned on by a rated driving voltage, so the driving voltage needs to be connected to the source of the switch unit in a floating manner, and the driving power supply which is not grounded to the source of the switch unit increases the number of voltage transformation devices required by the power supply circuit, thereby increasing the volume and cost of the power supply circuit.

SUMMERY OF THE UTILITY MODEL

The present application aims to provide a power supply circuit, which aims to solve the problems of large volume and high cost of the conventional power supply circuit due to the requirement of two different power supply places.

A first aspect of an embodiment of the present application provides a power supply circuit, including:

a power supply module configured to generate a direct-current power supply voltage from an alternating-current input voltage;

the driving module is connected with the power supply module and is configured to boost the power supply voltage and generate a driving voltage; wherein a voltage difference between the driving voltage and the power voltage is unchanged; and

and the switch module is respectively connected with the power supply module and the driving module and is configured to transfer the power supply voltage to an electric load when the driving voltage is greater than the starting voltage.

In one embodiment, the driving module includes a voltage stabilizing component, an oscillating component and a clamping boosting component;

the voltage stabilizing component is configured to step down the power supply voltage to generate a stabilized voltage;

the oscillating assembly is connected with the voltage stabilizing assembly and is configured to generate a second alternating voltage according to the voltage stabilizing voltage;

the clamping boosting component is connected with the oscillating component and configured to superpose the second alternating-current voltage and the power supply voltage to generate the driving voltage.

In one embodiment, the switch module comprises a switch component and a control component;

the control component is configured to receive a control signal and output a cut-off signal according to the control signal;

the switch component is connected with the control component and is configured to switch the power supply voltage to the electric load when the input of the cut-off signal is stopped and the driving voltage is greater than the starting voltage.

In one embodiment, the power module includes a transformer, a first diode, and a first capacitor;

the first end of the primary winding of the transformer is connected to the first input end of the alternating-current input voltage of the power supply module, the second end of the primary winding of the transformer is connected to the second input end of the alternating-current input voltage of the power supply module, the first end of the secondary winding of the transformer is connected with the anode of the first diode, the cathode of the first diode is connected with the first end of the first capacitor and connected to the power supply voltage output end of the power supply module, and the second end of the secondary winding of the transformer and the second end of the first capacitor are both connected with a power supply ground.

In one embodiment, the voltage regulator assembly includes a first field effect transistor, a first resistor, a first voltage regulator diode, a second voltage regulator diode, and a second capacitor;

the negative electrode of the first voltage stabilizing diode, the collector of the first field effect transistor and the first end of the first resistor are connected in common and connected to the power supply voltage input end of the voltage stabilizing component, the positive electrode of the first voltage stabilizing diode, the emitter of the first field effect transistor and the first end of the second capacitor are connected in common and connected to the voltage stabilizing voltage output end of the voltage stabilizing component, the second end of the first resistor, the base of the first field effect transistor and the negative electrode of the second voltage stabilizing diode are connected in common, and the positive electrode of the second voltage stabilizing diode and the second end of the second capacitor are connected with the power supply ground.

In one embodiment, the oscillation component includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second field effect transistor, a third capacitor, and a fourth capacitor;

the first end of the second resistor, the first end of the third resistor, the first end of the fourth resistor and the first end of the fifth resistor are connected in common and connected to a voltage-stabilizing input end of the oscillating assembly, the second end of the second resistor, the first end of the third capacitor and the collector of the second field effect transistor are connected in common, the second end of the third resistor, the base of the second field effect transistor and the first end of the fourth capacitor are connected in common, the second end of the fourth resistor, the second end of the third capacitor and the base of the third field effect transistor are connected in common, the second end of the fifth resistor, the second end of the fourth capacitor and the collector of the third field effect transistor are connected in common and connected to the second alternating voltage output end of the oscillating component, and the emitter of the second field effect transistor and the emitter of the third field effect transistor are both connected with a power ground.

In one embodiment, the clamping boosting component includes a second diode, a third diode, a fifth capacitor and a sixth capacitor;

the first end of the fifth capacitor is connected to the second alternating voltage input end of the clamping boosting assembly, the second end of the fifth capacitor, the cathode of the second diode and the anode of the third diode are connected in common, the cathode of the third diode is connected with the first end of the sixth capacitor and connected to the driving voltage output end of the clamping boosting assembly, and the anode of the second diode is connected with the second end of the sixth capacitor and connected to the power supply voltage input end of the clamping boosting assembly.

In one embodiment, the switch assembly includes a sixth resistor, a seventh resistor, an eighth resistor, a fourth field effect transistor, a fifth field effect transistor, and a third zener diode;

the first end of the sixth resistor is connected to the driving voltage input end of the switch component, the drain electrode of the fourth field effect transistor is connected to the power supply voltage input end of the switch component, the source electrode of the fourth field effect transistor, the first end of the seventh resistor, the first end of the eighth resistor, the anode of the third voltage stabilizing diode and the source electrode of the fifth field effect transistor are connected in common, the second end of the sixth resistor, the grid electrode of the fourth field effect transistor, the second end of the seventh resistor, the cathode of the third voltage stabilizing diode and the grid electrode of the fifth field effect transistor are connected in common and connected to the cut-off signal input end of the switch component, the second end of the eighth resistor is connected with a power ground, and the drain electrode of the fifth field effect transistor is connected to the power supply voltage output end of the switch component.

In one embodiment, the control component includes a ninth resistor, a tenth resistor and a sixth fet;

the first end of the ninth resistor is connected to the cut-off signal output end of the control assembly, the second end of the ninth resistor is connected with the collector of the sixth field-effect tube, the base of the sixth field-effect tube is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected to the control signal input end of the control assembly, and the emitter of the sixth field-effect tube is connected with the power ground.

A second aspect of embodiments of the present application also provides a charging apparatus, including the power supply circuit according to any one of the first aspect.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects: the driving module boosts the rated voltage value of the power supply voltage to generate the driving voltage, so that the voltage difference between the driving voltage and the power supply voltage is unchanged, the driving voltage acting on the switch module changes along with the change of the power supply voltage, and the conduction of the switch module is not influenced by the change of the power supply voltage. Therefore, the switch module does not need to be connected in a floating mode, the driving voltage and the power supply voltage do not need to be processed in a non-common mode, the driving voltage and the power supply voltage do not need to be isolated from each other, the number of power supply modules needed by the power supply circuit is reduced, and the size of the power supply circuit is reduced and the cost of the power supply circuit is reduced.

Drawings

Fig. 1 is a first exemplary functional block diagram of a power circuit provided in an embodiment of the present application;

fig. 2 is a second exemplary functional block diagram of a power circuit provided by an embodiment of the present application;

fig. 3 is an exemplary circuit schematic diagram of a power circuit provided in an embodiment of the present application.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, an embodiment of the present application provides a power circuit, which includes a power module 100, a driving module 200, and a switch module 300.

The power supply module 100 is configured to generate a dc power supply voltage according to an ac input voltage.

The driving module 200 is connected to the power module 100, and configured to boost a power voltage and generate a driving voltage. Wherein, the voltage difference between the driving voltage and the power voltage is unchanged.

The switch module 300 is connected to the power module 100 and the driving module 200, respectively, and configured to switch the power voltage to the electrical load 400 when the driving voltage is greater than the starting voltage.

In a specific application, the power supply module 100 may perform isolation step-down, rectification and other processes on the ac input voltage to generate the power supply voltage.

In the present embodiment, the power module 100 generates a dc power voltage from an ac input voltage of an external power source and outputs the dc power voltage to the driving module 200. The driving module 200 boosts the power voltage by a rated voltage value to generate a driving voltage and outputs the driving voltage to the switching module 300. When the driving voltage is greater than the starting voltage, the switch module 300 is turned on and transfers the power voltage to the electrical load 400 to supply power to the electrical load 400.

The driving module 200 generates the driving voltage by boosting the power voltage by the rated voltage value, so that the voltage difference between the driving voltage and the power voltage is not changed, and the driving voltage applied to the switch module 300 is changed along with the change of the power voltage, so that the change of the power voltage does not affect the conduction of the switch module 300. Therefore, the switch module 300 does not need to be connected in a floating manner, the driving voltage and the power voltage do not need to be processed in a non-common manner, the driving voltage and the power voltage do not need to be isolated from each other, and the driving voltage can be directly provided by the power voltage. Further, since the driving voltage can be obtained by the power supply voltage, the withstand voltage level of the electronic components used in the driving module 200 is reduced, the stability of the driving module 200 is improved, and the cost of the power supply circuit is further reduced.

The starting voltage is designed by a person skilled in the art according to actual needs, and is not limited herein; the electric load 400 may be a battery, and when the electric load 400 is a battery, the power supply circuit serves as a charging circuit for the battery.

Referring to fig. 2, in an embodiment, the driving module 200 includes a voltage stabilizing component 210, an oscillating component 220, and a clamp boosting component 230.

A voltage stabilizing component 210 configured to step down the power supply voltage to generate a stabilized voltage.

And an oscillating component 220 connected to the voltage stabilizing component 210 and configured to generate a second ac voltage according to the stabilized voltage.

And a clamping boosting component 230 connected to the oscillating component 220 and configured to superimpose the second alternating voltage on the power supply voltage to generate a driving voltage.

In the embodiment, the voltage stabilizing component 210 steps down the power voltage to generate a stabilized voltage and outputs the stabilized voltage to the oscillating component 220. The oscillating component 220 inverts the regulated voltage to generate a second ac voltage and outputs the second ac voltage to the clamping voltage boosting component 230. The clamp boosting component 230 superimposes the second ac voltage on the power supply voltage to generate the driving voltage, so that the difference between the driving voltage and the power supply current is equal to the voltage value of the second ac voltage and remains unchanged. Meanwhile, the voltage stabilizing component 210 generates a stabilized voltage by stepping down the power voltage output by the power module 100, the second ac voltage is generated by the stabilized voltage, and the driving voltage is formed by superimposing the power voltage and the second ac voltage, so that the voltage stabilizing component 210, the oscillating component 220, and the clamp boosting component 230 are isolated from the ac input voltage.

The second alternating voltage is a square wave voltage.

Referring to fig. 2, in one embodiment, the switch module 300 includes a switch element 310 and a control element 320.

The control component 320 is configured to receive the control signal and output a cutoff signal according to the control signal.

The switching component 310 is connected to the control component 320 and configured to switch the power voltage to the electrical load 400 when the input of the off signal is stopped and the driving voltage is greater than the starting voltage.

In the present embodiment, when the control component 320 does not receive the control signal output by the external control signal output module 500, the control component 320 does not output the off signal to the switch component 310. On the premise that the off signal is not input, and the input driving voltage is greater than the starting voltage, the switching element 310 is turned on and transfers the power voltage to the electrical load 400. When it is required to stop supplying power to the electrical load 400, a control signal is input to the control component 320, so that the control component 320 outputs a cut-off signal to the switch component 310. The switching element 310 changes from the on state to the off state when the off signal is input, and stops the transfer of the power supply voltage to the electric load 400.

Referring to fig. 3, in an embodiment, the power module 100 includes a transformer T1, a first diode D1, and a first capacitor C1.

A first terminal of a primary winding of the transformer T1 is connected to a first input terminal of the ac input voltage of the power module 100, a second terminal of the primary winding of the transformer T1 is connected to a second input terminal of the ac input voltage of the power module 100, a first terminal of a secondary winding of the transformer T1 is connected to an anode of a first diode D1, a cathode of the first diode D1 is connected to a first terminal of a first capacitor C1 and to a supply voltage output terminal of the power module 100, and a second terminal of the secondary winding of the transformer T1 and a second terminal of the first capacitor C1 are both connected to ground.

Referring to fig. 3, in an embodiment, the voltage regulator 210 includes a first fet Q1, a first resistor R1, a first zener diode ZD1, a second zener diode ZD2, and a second capacitor C2.

The cathode of the first zener diode ZD1, the collector of the first field-effect transistor Q1, and the first end of the first resistor R1 are commonly connected and connected to the power supply voltage input end of the voltage regulation component 210, the anode of the first zener diode ZD1, the emitter of the first field-effect transistor Q1, and the first end of the second capacitor C2 are commonly connected and connected to the voltage regulation voltage output end of the voltage regulation component 210, the second end of the first resistor R1, the base of the first field-effect transistor Q1, and the cathode of the second zener diode ZD2 are commonly connected, and the anode of the second zener diode ZD2 and the second end of the second capacitor C2 are both connected to the power supply ground.

Referring to fig. 3, in an embodiment, the oscillating device 220 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second fet Q2, a third fet Q3, a third capacitor C3, and a fourth capacitor C4.

A first end of the second resistor R2, a first end of the third resistor R3, a first end of the fourth resistor R4, and a first end of the fifth resistor R5 are commonly connected to a regulated voltage input terminal of the oscillating assembly 220, a second end of the second resistor R2, a first end of the third capacitor C3, and a collector of the second fet Q2 are commonly connected, a second end of the third resistor R3, a base of the second fet Q2, and a first end of the fourth capacitor C4 are commonly connected, a second end of the fourth resistor R4, a second end of the third capacitor C3, and a base of the third fet Q3 are commonly connected, a second end of the fifth resistor R5, a second end of the fourth capacitor C4, and a collector of the third fet Q3 are commonly connected to a second ac voltage output terminal of the oscillating assembly 220, and an emitter of the second fet Q2 and an emitter of the third fet Q3 are all connected to a power ground.

Referring to fig. 3, in an embodiment, the clamping boosting device 230 includes a second diode D2, a third diode D3, a fifth capacitor C5 and a sixth capacitor C6.

A first end of the fifth capacitor C5 is connected to the second ac voltage input end of the clamp boosting device 230, a second end of the fifth capacitor C5, a cathode of the second diode D2, and an anode of the third diode D3 are commonly connected, a cathode of the third diode D3 is connected to the first end of the sixth capacitor C6 and to the driving voltage output end of the clamp boosting device 230, and an anode of the second diode D2 is connected to the second end of the sixth capacitor C6 and to the power supply voltage input end of the clamp boosting device 230.

Referring to fig. 3, in an embodiment, the switch device 310 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourth fet Q4, a fifth fet Q5, and a third zener diode ZD 3.

A first end of the sixth resistor R6 is connected to the driving voltage input end of the switch device 310, a drain of the fourth fet Q4 is connected to the power voltage input end of the switch device 310, a source of the fourth fet Q4, a first end of the seventh resistor R7, a first end of the eighth resistor R8, an anode of the third zener diode ZD3, and a source of the fifth fet Q5 are commonly connected, a second end of the sixth resistor R6, a gate of the fourth fet Q4, a second end of the seventh resistor R7, a cathode of the third zener diode ZD3, and a gate of the fifth fet Q5 are commonly connected to the cutoff signal input end of the switch device 310, a second end of the eighth resistor R8 is connected to the power ground, and a drain of the fifth fet Q5 is connected to the power voltage output end of the switch device 310.

Referring to fig. 3, in an embodiment, the control device 320 includes a ninth resistor R9, a tenth resistor R10, and a sixth fet Q6.

A first end of the ninth resistor R9 is connected to the off signal output end of the control component 320, a second end of the ninth resistor R9 is connected to the collector of the sixth fet Q6, the base of the sixth fet Q6 is connected to a first end of the tenth resistor R10, a second end of the tenth resistor R10 is connected to the control signal input end of the control component 320, and the emitter of the sixth fet Q6 is connected to the power ground.

The power supply circuit shown in fig. 3 will be explained with reference to the working principle:

the primary winding of the transformer T1 is used for connecting with an external power supply, the transformer T1 steps down the ac input voltage to generate a third ac voltage, and the first diode D1 rectifies the third ac voltage to generate a dc power supply voltage. The first zener diode ZD1, the second zener diode ZD2 and the first resistor R1 jointly limit the regulated voltage of the emitter of the first field-effect transistor Q1, so that the regulated voltage of the emitter of the first field-effect transistor Q1 is equal to the breakdown voltage of the second zener diode ZD2, and the regulated voltage of the emitter of the first field-effect transistor Q1 is equal to the power supply voltage minus the breakdown voltage of the first zener diode ZD1, so that the regulated voltage of the emitter of the first field-effect transistor Q1 is at a stable value. For example, the power supply voltage is 48V, the breakdown voltage of the first zener diode ZD1 is 18V, the breakdown voltage of the second zener diode ZD2 is 30V, and the breakdown voltage of the emitter of the first fet Q1 is 18V. The regulated voltage passes through the oscillating module 220 composed of the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the second field effect transistor Q2, the third field effect transistor Q3, the third capacitor C3 and the fourth capacitor C4, and then becomes a square wave voltage (second alternating voltage). When the voltage value of the square wave voltage is at the valley, the third fet Q3 is turned on, and the power supply voltage charges the fifth capacitor C5, so that the voltage at the second terminal of the fifth capacitor C5 becomes the power supply voltage. When the voltage value of the square wave voltage is at the peak, the third fet Q3 is turned off, and the square wave voltage acts on the first terminal of the fifth capacitor C5, because the voltage of the capacitor cannot change abruptly, the voltage at the second terminal of the fifth capacitor C5 is equal to the square wave voltage plus the power supply voltage, and the voltage (driving voltage) at the first terminal of the sixth capacitor C6 is also equal to the square wave voltage plus the power supply voltage. At this time, the voltage of the first end of the sixth capacitor C6 acts on the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8, and the divided voltage of the seventh resistor R7 is greater than the turn-on voltage of the fourth fet Q4 and the turn-on voltage of the fifth fet Q5, so that the fourth fet Q4 and the fifth fet Q5 are turned on. The divided voltage of the seventh resistor R7 is positively correlated with the driving voltage, so the divided voltage of the seventh resistor R7 varies with the variation of the power supply voltage. After the divided voltage of the seventh resistor R7 is greater than the turn-on voltage of the fourth fet Q4 and the turn-on voltage of the fifth fet Q5, the divided voltage of the seventh resistor R7 increases as the power supply voltage increases, so that the fourth fet Q4 and the fifth fet are both kept on. The third zener diode ZD3 ensures that the divided voltage of the seventh resistor R7 does not exceed the breakdown voltage of the third zener diode ZD3, so that the gate-source voltage of the fourth field-effect transistor Q4 and the gate-source voltage of the fifth field-effect transistor Q5 do not exceed the breakdown voltage of the third zener diode ZD3, and the fourth field-effect transistor Q4 and the fifth field-effect transistor Q5 are protected. At this time, the power supply voltage OUT output from the first diode D1 is output to the electric load through the fourth fet Q4 and the fifth fet Q5. Wherein the negative pole of the consumer is connected to the power ground.

When the output of the power voltage OUT to the electric load needs to be stopped, a high level signal is input to the base of the sixth field effect transistor Q6 to turn on the sixth field effect transistor Q6, at this time, the gate of the fourth field effect transistor Q4 and the gate of the fifth field effect transistor Q5 are both connected with the power ground through the fourth field effect transistor Q4, and the fourth field effect transistor Q5 and the fifth field effect transistor Q5 are both turned off to stop the output of the power voltage to the electric load.

The driving voltage and the power supply voltage of the power supply circuit of the embodiment share a power ground, and the driving voltage and the power supply voltage do not need to be isolated, so that one transformer T1 can be shared to obtain electric energy from the alternating-current input voltage, and compared with the power supply circuit which needs to isolate the driving voltage and the power supply voltage, the power supply circuit has the advantages of reduced size, reduced cost and reduced power consumption. Meanwhile, the power circuit of the embodiment is not controlled by the optocoupler fourth field effect transistor Q4 and fifth field effect transistor Q5, and the cost is further reduced.

The present invention further provides a charging device including the power circuit according to any of the above embodiments, wherein the charging device includes the power circuit according to any of the above embodiments, so that the charging device of the present embodiment at least includes the corresponding advantages of the power circuit according to any of the above embodiments.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A power supply circuit, comprising:

2. The power supply circuit of claim 1, wherein the driving module comprises a voltage stabilizing component, an oscillating component, and a clamp boosting component;

3. The power supply circuit of claim 1, wherein the switch module comprises a switch component and a control component;

4. The power supply circuit of claim 1, wherein the power supply module comprises a transformer, a first diode, and a first capacitor;

5. The power supply circuit of claim 2, wherein the voltage regulation component comprises a first field effect transistor, a first resistor, a first zener diode, a second zener diode, and a second capacitor;

6. The power supply circuit according to claim 2, wherein the oscillating component includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second field effect transistor, a third capacitor, and a fourth capacitor;

7. The power supply circuit of claim 2, wherein the clamping boost component comprises a second diode, a third diode, a fifth capacitor, and a sixth capacitor;

8. The power supply circuit of claim 3 wherein the switching assembly includes a sixth resistor, a seventh resistor, an eighth resistor, a fourth field effect transistor, a fifth field effect transistor, and a third zener diode;

9. The power supply circuit of claim 3 wherein the control component comprises a ninth resistor, a tenth resistor, and a sixth field effect transistor;

10. A charging device comprising a power supply circuit according to any one of claims 1 to 9.