CN114337311A

CN114337311A - Power supply circuit, output method of starting power supply and starting power supply

Info

Publication number: CN114337311A
Application number: CN202111674208.8A
Authority: CN
Inventors: 雷云; 张智锋; 欧阳明星
Original assignee: Shenzhen Carku Technology Co Ltd
Current assignee: Shenzhen Carku Technology Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-12

Abstract

The application provides a power supply circuit, an output method of a starting power supply and the starting power supply, wherein the power supply circuit comprises: the device comprises a switch circuit, an interface circuit, a type identification circuit and a main control circuit; the interface circuit is used for externally connecting a load and is connected with the energy storage assembly through the switch circuit; the energy storage assembly can supply power to an external load through the switch circuit and the interface circuit; the type identification circuit is used for identifying the type of a load externally connected with the interface circuit; the main control circuit is used for determining a pulse width modulation signal according to the type of the load; the switch circuit is used for controlling the state of the energy storage component for supplying power to the load based on the pulse width modulation signal. This application can carry out the power supply of different modes to different loads, promotes the suitability of starting power supply.

Description

Power supply circuit, output method of starting power supply and starting power supply

Technical Field

The present disclosure relates to power supply technologies, and in particular, to a power supply circuit, a method for outputting a start power supply, and a start power supply.

Background

When an engine of a motor vehicle (such as an automobile) is started, a starting current is required to be supplied by a storage battery for ignition starting, but when the storage battery cannot supply the starting current for the vehicle for some reasons, a starting power supply is required for emergency ignition. However, the starting power supply is only used for igniting the vehicle, has single function and cannot adapt to the diversity requirements of users.

Disclosure of Invention

The present disclosure is directed to a power supply circuit, a method for outputting a start-up power supply, and aims to improve applicability of the power supply circuit.

In a first aspect, the present application provides a power supply circuit, comprising:

a switching circuit;

the interface circuit is used for externally connecting a load and is connected with the energy storage assembly through the switch circuit; the energy storage assembly can supply power to an external load through the switch circuit and the interface circuit;

the type identification circuit is used for identifying the type of a load externally connected with the interface circuit;

the main control circuit is used for determining a pulse width modulation signal according to the type of the load;

the switching circuit is used for controlling the state of the energy storage component for supplying power to the load based on the pulse width modulation signal.

In one embodiment, the power supply circuit further comprises: the current detection circuit is used for detecting the output current of the energy storage assembly for supplying power to the load, and the main control circuit is used for adjusting the duty ratio of the pulse width modulation signal according to the output current so as to enable the output current to be constant.

In one embodiment, under the condition that the type of the load comprises a first type needing direct power supply, the main control circuit determines a first pulse width modulation signal according to the first type; the switching circuit is used for controlling the energy storage component to directly supply power to the load based on the first pulse width modulation signal.

In one embodiment, the duty cycle of the first level in the first pwm signal is one hundred percent, and the first level causes the switching circuit to be continuously turned on.

In one embodiment, the first type of load to be directly powered comprises a load of an electrical component.

In an embodiment, under the condition that the type of the load includes a second type requiring constant-current power supply, the main control circuit is further configured to obtain an output current of the energy storage component for supplying power to the load, and determine a second pulse width modulation signal according to the second type and the output current; the switching circuit is used for controlling the energy storage assembly to supply power to the load at a constant current based on the second pulse width modulation signal.

In one embodiment, the second type of load requiring constant current supply includes a load of a chargeable component.

In one embodiment, the type identification circuit includes: the first load detection circuit is connected with the interface circuit and the main control circuit and is used for detecting the voltage of the interface circuit when the interface circuit is externally connected with a load to obtain a detection result; the main control circuit is also used for determining the type of the load according to the detection result.

In an embodiment, when the voltage of the interface circuit externally connected to the load is less than or equal to the first preset voltage threshold, the main control circuit is further configured to determine, according to the detection result, that the type of the load includes a first type that needs to be directly powered.

In an embodiment, when the voltage of the interface circuit externally connected to the load is greater than the first preset voltage threshold, the main control circuit is further configured to determine, according to the detection result, that the type of the load includes a second type requiring constant-current power supply.

In one embodiment, the power supply circuit further comprises: the second load detection circuit is connected with the interface circuit and is used for detecting the condition of an external load of the interface circuit; and under the condition that the second load detection circuit detects that the interface circuit is not externally connected with a load, the switch circuit is in a turn-off state so as to prevent the energy storage assembly from outputting power supply.

In one embodiment, a switching circuit includes: a push-pull circuit; the grid electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor through a push-pull circuit, the source electrode of the first field effect transistor is connected with the energy storage assembly, and the drain electrode of the first field effect transistor is connected with the interface circuit; the source electrode of the second field effect transistor is grounded, and the grid electrode of the second field effect transistor is used for receiving the pulse width modulation signal output by the main control circuit, so that the second field effect transistor is switched on or switched off, and the first field effect transistor is controlled to be switched on or switched off.

In one embodiment, the second fet is configured to turn on when receiving a high level pwm signal and to turn off when receiving a low level pwm signal; the push-pull circuit is used for setting the grid electrode of the first field effect transistor to be at a low level when the second field effect transistor is switched on and setting the grid electrode of the first field effect transistor to be at a high level when the second field effect transistor is switched off; the first field effect transistor is used for being switched on when the grid electrode of the first field effect transistor is at a low level and is also used for being switched off when the grid electrode of the first field effect transistor is at a high level.

In one embodiment, the power supply circuit is applied to a vehicle emergency starting power supply, the interface circuit can be used for connecting a vehicle storage battery, and the energy storage assembly supplies current to the vehicle through the switching circuit and the interface circuit so as to realize vehicle starting.

In a second aspect, the present application further provides an output method of a start-up power supply, where the output method of the start-up power supply includes:

determining a type of a load connected to a starting power supply;

determining a pulse width modulation signal according to the type of the load;

and controlling the conduction state of a switching circuit of the starting power supply according to the pulse width modulation signal so as to control the state of the starting power supply supplying power to the load.

In one embodiment, the types of the load include a first type requiring direct power supply and a second type requiring constant current power supply.

In one embodiment, the pulse width modulation signal is determined according to the type of the load; the method for controlling the on state of the switch circuit of the starting power supply according to the pulse width modulation signal so as to control the power supply state of the starting power supply to the load comprises the following steps:

if the type of the load comprises a first type needing direct power supply, determining a first pulse width modulation signal;

and controlling the conducting state of the switch circuit according to the first pulse width modulation signal so as to control the starting power supply to directly supply power to the load.

In one embodiment, the duty cycle of the first level in the first pwm signal is one hundred percent, and the first level controls the switching circuit to be continuously turned on.

In one embodiment, determining the pwm signal according to the type of the load and controlling the on-state of the switching circuit of the start-up power supply according to the pwm signal to control the power supply state of the start-up power supply to the load includes:

if the type of the load comprises a second type requiring constant current power supply, acquiring the output current of a starting power supply, and determining a second pulse width modulation signal;

and controlling the conduction state of the switch circuit according to the output current and the second pulse width modulation signal so as to control the starting power supply to supply power to the load at a constant current.

In one embodiment, determining the type of load connected to the startup power supply includes:

if the interface of the starting power supply is connected with the load, detecting a first voltage of the interface of the starting power supply to obtain a detection result;

and determining the type of the load according to the detection result.

In one embodiment, determining the type of the load according to the detection result includes:

if the first voltage is less than or equal to a first preset voltage threshold value, determining that the type of the load comprises a first type needing direct power supply.

and if the first voltage is larger than a first preset voltage threshold value, determining that the type of the load comprises a second type requiring constant-current power supply.

In one embodiment, the output method further includes:

detecting whether an interface of a starting power supply is externally connected with a load or not;

and if the interface of the starting power supply is not externally connected with a load, controlling the switch circuit to be in a turn-off state.

In one embodiment, detecting whether an interface for starting a power supply is externally connected to a load includes:

acquiring a second voltage of an interface for starting a power supply;

and if the second voltage is greater than or equal to a second preset voltage threshold value, determining to start the external load of the interface of the power supply.

acquiring a second voltage of an interface for starting a power supply;

and if the second voltage is smaller than a second preset voltage threshold value, determining that the interface of the starting power supply is not externally connected with a load.

In an embodiment, the method further comprises:

acquiring output current of a starting power supply;

and adjusting the duty ratio of the pulse width modulation signal according to the magnitude of the output current so as to make the output current constant.

In a third aspect, the present application further provides a starting power supply, which includes a casing and a power supply circuit as described in any one of the above, wherein at least a part of the power supply circuit is disposed in the casing.

The application provides a power supply circuit, an output method of a starting power supply and the starting power supply, wherein the power supply circuit comprises: a switching circuit; the interface circuit is used for externally connecting a load and is connected with the energy storage assembly through the switch circuit; the energy storage assembly can supply power to an external load through the switch circuit and the interface circuit; the type identification circuit is used for identifying the type of a load externally connected with the interface circuit; the main control circuit is used for determining a pulse width modulation signal according to the type of the load; the switching circuit is used for controlling the state of the energy storage component for supplying power to the load based on the pulse width modulation signal. The method and the device can adjust the state of power supply to the load by identifying the type of the external load, so as to improve the applicability of the power supply circuit to different loads.

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 embodiment of a power supply circuit provided in an embodiment of the present application;

fig. 2 is a circuit schematic diagram of another implementation of a power supply circuit provided by an embodiment of the present application;

FIG. 3 is a circuit schematic diagram of yet another implementation of a power supply circuit provided by an embodiment of the present application;

FIG. 4 is a circuit schematic diagram of yet another implementation of a power supply circuit provided by an embodiment of the present application;

FIG. 5 is a circuit diagram illustrating yet another embodiment of a power supply circuit according to an embodiment of the present disclosure;

FIG. 6 is a circuit diagram illustrating yet another implementation of a power supply circuit according to an embodiment of the present disclosure;

FIG. 7 is a circuit schematic diagram of yet another implementation of a power supply circuit provided by an embodiment of the present application;

FIG. 8 is a circuit schematic of yet another implementation of a power supply circuit provided by an embodiment of the present application;

FIG. 9 is a circuit diagram illustrating yet another embodiment of a power supply circuit according to an embodiment of the present application;

FIG. 10 is a circuit schematic diagram of yet another implementation of a power supply circuit provided by an embodiment of the present application;

fig. 11 is a schematic flowchart illustrating an output method of a start-up power supply according to an embodiment of the present disclosure;

description of reference numerals:

10. a switching circuit; 20. an interface circuit; 30. a type identification circuit;

31. a first load detection circuit; 40. a master control circuit; 50. an energy storage assembly;

60. a voltage stabilizing circuit; 70. a current detection circuit; 80. a second load detection circuit;

11. a push-pull circuit.

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.

The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

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 schematic block diagram of a power supply circuit according to an embodiment of the present disclosure.

The power supply circuit includes a switch circuit 10, an interface circuit 20, a type identification circuit 30, and a main control circuit 40.

The interface circuit 20 is used for externally connecting a load and is connected with the energy storage assembly 50 through the switch circuit 10, and the energy storage assembly 50 can supply power to the load externally connected with the interface circuit 20 through the switch circuit 10 and the interface circuit 20; the type identification circuit 30 can identify the type of the load externally connected to the interface circuit 20, so that the main control circuit 40 can determine the pwm signal according to the type of the load and transmit the pwm signal to the switch circuit 10, and the switch circuit 10 is configured to control the state of the energy storage component 50 supplying power to the load based on the pwm signal.

For example, as shown in fig. 1, the type identification circuit 30 is connected to the main control circuit 40 and the interface circuit 20, and the type identification circuit 30 can identify the type of the load when the interface circuit 20 is externally connected to the load, so that the main control circuit 40 outputs a corresponding pulse width modulation signal to the switch circuit 10 according to the identified load type; the switch circuit 10 is respectively connected with the interface circuit 20 and the energy storage component 50, and is also connected with the main control circuit 40, the switch circuit 10 controls the on or off state of the switch circuit 10 by receiving the pulse width modulation signal output by the main control circuit 40, so as to control the state of the energy storage component 50 for supplying power to the load externally connected with the interface circuit 20, thereby realizing power supply of different modes for different loads, and improving the applicability of the power supply circuit.

For example, the main control circuit 40 may be connected to a control terminal of the switch circuit 10 to control the switch circuit 10 to be turned on or off by a pulse width modulation signal output from the main control circuit 40; or the master control circuit 40 may also be connected to an enable terminal of the switch circuit 10 to enable the master control circuit 40 to control the switch circuit 10. It should be noted that, the present application can achieve the purpose of controlling the switch circuit 10 through the main control circuit 40 to control the power supply state of the energy storage component 50 to the load, and the specific connection manner between the main control circuit 40 and the switch circuit 10 is not limited.

Illustratively, the master control circuit 40 may include a programmable Microcontroller (MCU) to enable the determination of the pulse width modulation signal based on the type of load.

In some embodiments, as shown in fig. 2, the power supply circuit further includes a regulation circuit 60, wherein the regulation circuit 60 is connected between the energy storage component 50 and the master control circuit 40 to enable the energy storage component 50 to provide an operating voltage to the master control circuit 40. For example, the voltage regulator circuit 60 may include an ldo (low dropout regulator) circuit.

In some embodiments, the power supply circuit further includes a current detection circuit 70. The current detection circuit 70 is configured to detect an output current of the energy storage component 50 for supplying power to the load, so that the main control circuit 40 can adjust the duty ratio of the pulse width modulation signal according to the magnitude of the output detected by the current detection circuit 70, so as to make the output current for supplying power to the load constant.

Illustratively, the current detection circuit 70 is capable of detecting an output current supplied to the load, which may be a current at any point in the power circuit loop, or a current in the interface circuit 20.

In some embodiments, as shown in fig. 3, the current detection circuit 70 is connected between the interface circuit 20 and the main control circuit 40, so that the main control circuit 40 can adjust the duty ratio of the pulse width modulation signal according to the magnitude of the output current detected by the current detection circuit 70.

In some embodiments, the current detection circuit 70 may include a detection resistor and an operational amplifier, the detection resistor is connected between the interface circuit 20 and the energy storage component 50, and the operational amplifier is used to measure the voltage difference between two sides of the detection resistor, so as to obtain the output current.

Illustratively, as shown in fig. 4, the current detection circuit 70 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and an operational amplifier a. The first resistor R1 is a sense resistor.

The first end of the first resistor R1 is connected to the interface circuit 20, and the first end of the first resistor R1 is further connected to the positive input end of the operational amplifier a through the second resistor R2; a second end of the first resistor R1 is connected with the negative input end of the operational amplifier A through a third resistor R3, and a second end of the first resistor R1 is also used for grounding; the positive input terminal of the operational amplifier a is further grounded through a fourth resistor R4, the negative input terminal of the operational amplifier a is further connected to the output terminal of the operational amplifier a through a fifth resistor R5, and the output terminal of the operational amplifier a is connected to the main control circuit 40, so that the main control circuit 40 can adjust the duty ratio of the pwm signal according to the magnitude of the output detected by the current detection circuit 70.

Illustratively, the second resistor R2 and the third resistor R3 have the same resistance, the fourth resistor R4 and the fifth resistor R5 have the same resistance, the output current passes through the first resistor R1, a voltage difference V1 is generated at one end of the fourth resistor R4 connected to the positive input terminal of the operational amplifier a and at one end of the fifth resistor R5 connected to the negative input terminal of the operational amplifier a, and the positive input terminal and the negative input terminal of the operational amplifier a have approximately the same potential. Therefore, there is a current difference between the currents flowing through the first resistor R1 and the second resistor R2, and the current difference acts on the fourth resistor R4 and the fifth resistor R5, and since the potentials of the one ends of the fourth resistor R4 and the fifth resistor R5 are the same, a voltage difference is generated at the other end, and since the other end of the fourth resistor R4 is grounded, the voltage is 0V, the magnitude of the voltage output by the other end of the fifth resistor R5 can reflect the magnitude of the current flowing through the detection resistor R1 in a stable state, so as to achieve the purpose of detecting the output current.

Illustratively, the current detection circuit 70 further includes a sixth resistor R6 and a first capacitor C1. The output end of the operational amplifier a is connected to the main control circuit 40 and one end of the first capacitor C1 through the sixth resistor R6, and the other end of the first capacitor C1 is grounded, it can be understood that the sixth resistor R6 and the first capacitor C1 can play a role in protecting the circuit and increasing the stability of the circuit.

In some embodiments, the power supply circuit further comprises: and the second load detection circuit 80, the second load detection circuit 80 being connected to the interface circuit 20, wherein the second load detection circuit 80 is configured to detect a condition of an external load of the interface circuit 20. When the second load detection circuit 80 detects that the interface circuit 20 is not externally connected with a load, the switch circuit 10 is in an off state to prevent the energy storage component 50 from outputting power.

Specifically, the second load detection circuit 80 is configured to detect whether the interface circuit 20 has an external load, and when the second load detection circuit 80 detects that the interface circuit 20 has no external load, the switch circuit 10 is in an off state to prevent the energy storage component 50 from outputting power.

For example, in the case that the second load detection circuit 80 detects that the interface circuit 20 is not externally connected with a load, the second load detection circuit 80 may directly control the switch circuit 10 to be in the off state.

Illustratively, the switching circuit 10 may also be controlled by the second load detection circuit 80 in conjunction with other circuits in the power supply circuit based on the signal output by the second load detection circuit 80.

For example, as shown in fig. 5, the second load detection circuit 80 is connected between the interface circuit 20 and the main control circuit 40 to control the switch circuit 10 through the second load detection circuit 80 and the main control circuit 40. Specifically, when the main control circuit 40 receives the detection result of the second load detection circuit 80 indicating that the load is not externally connected, the control signal output by the main control circuit 40 controls the switch circuit 10 to be in the off state.

Specifically, as shown in fig. 6, the second load detection circuit 80 includes a seventh resistor R7 and an eighth resistor R8, a first end of the seventh resistor R7 is connected to the preset power voltage VCC, and a second end of the seventh resistor R7 is connected to the main control circuit 40; the second terminal of the seventh resistor R7 is also used to connect the interface circuit 20 through the eighth resistor R8.

Specifically, when the interface circuit 20 is not connected to a load, it may be regarded as an open circuit, and thus the voltage at the second end of the seventh resistor R7 is 0V, so that the second load detection circuit 80 outputs a low-level voltage signal to the main control circuit 40, and when the main control circuit 40 receives the low-level voltage signal, it is determined that the interface circuit 20 is not connected to the load, and the switch circuit 10 is controlled to be in an off state.

When the interface circuit 20 is connected to a load, the voltage at the second end of the seventh resistor R7 is not 0, so that the second load detection circuit 80 outputs a high-level voltage signal to the main control circuit 40, and when the main control circuit 40 receives the high-level voltage signal, it is determined that the interface circuit 20 is connected to the load, and the on-state of the switch circuit 10 is controlled, so as to control the state of the energy storage component 50 supplying power to the load.

It is understood that, the determination that the interface circuit 20 is connected to the external load when the main control circuit 40 receives the high-level voltage signal and the determination that the interface circuit 20 is not connected to the load when the main control circuit 40 receives the low-level voltage signal are illustrated by way of example, the result that the high-level voltage signal corresponds to the external load is not limited, and in other embodiments, the determination that the interface circuit 20 is connected to the load may be performed when the main control circuit 40 receives the low-level voltage signal.

For example, what has been written above is that the second load detection circuit 80 detects the voltage of the interface circuit 20 to enable the main control circuit 40 to determine whether a load is connected, and also detects the current or a signal generated when the load is connected to determine whether the load is connected. It is understood that the second load detection circuit 80 is capable of determining whether the interface circuit 20 is connected to a load by detecting a signal, such as a voltage signal, a current signal or a corresponding access signal when the load is accessed, and the signal detected by the second load detection circuit 80 is not limited herein.

In some embodiments, as shown in fig. 7, the type identifying circuit 30 includes: the first load detection circuit 31. The first load detection circuit 31 is connected to the interface circuit 20 and the main control circuit 40, and the first load detection circuit 31 is configured to detect a voltage when the interface circuit 20 is externally connected to a load, so as to obtain a detection result, and enable the main control circuit 40 to determine the type of the load according to the detection result.

For example, after the second load detection circuit 80 determines that the interface circuit 20 is connected with the load, the voltage of the interface circuit 20 may be detected by the first load detection circuit 31 to obtain a detection result, and the detection result is transmitted to the main control circuit 40, so that the main control circuit 40 can determine the type of the load according to the detection result.

In some embodiments, as shown in fig. 8, the first load detection circuit 31 includes a ninth resistor R9, a tenth resistor R10 and a second capacitor C2. A first end of the ninth resistor R9 is connected to the interface circuit 20, and a second end of the ninth resistor R9 is connected to the main control circuit 40; the second end of the ninth resistor R9 is also used for connecting the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is grounded; the first end of the second capacitor C2 is connected to the second end of the ninth resistor R9, and the second end of the second capacitor C2 is grounded. It is understood that the first load detection circuit 31 may detect the voltage of the interface circuit 20 through the ninth resistor R9 and the tenth resistor R10, and may transmit the detection result to the main control circuit 40, so that the main control circuit 40 determines the type of the load according to the detection result.

It is understood that the detection result may be a voltage signal, or may be another signal converted according to the detected voltage signal, such as a current signal, and the application does not limit the specific implementation of the detection result.

For convenience of description, the following embodiments take the detection result as a voltage signal as an example.

In some embodiments, in the case that the voltage when the interface circuit 20 is externally connected to a load is less than or equal to the first preset voltage threshold, the main control circuit 40 is further configured to determine, according to the detection result, that the type of the load includes a first type that needs to be directly powered.

For example, a first preset voltage threshold may be preset in the main control circuit 40, when the main control circuit 40 obtains the detection result of the first load detection circuit 31, the detection result is compared with the first preset voltage threshold, and if the voltage indicated by the detection result is less than or equal to the first preset voltage threshold, the main control circuit 40 determines that the type of the currently-accessed load is the first type that needs to be directly powered.

Illustratively, after the main control circuit 40 determines that the type of the load is the first type requiring direct power supply, the pulse width modulation signal is modulated to control the conducting state of the switching circuit 10, so as to control the state of the energy storage component 50 supplying power to the load.

In some embodiments, in the case that the identified load type is a first type that needs to be directly supplied with power, the main control circuit 40 determines a first pwm signal according to the first type, and outputs the first pwm signal to the switch circuit 10 to control the on-state of the switch circuit 10, so as to control the energy storage component 50 to directly supply power to the load.

Illustratively, according to the detection result of the type identification circuit 30, the main control circuit 40 determines that the type of the external load is the first type, generates a corresponding first pulse width modulation signal, and outputs the corresponding first pulse width modulation signal to the switch circuit 10 to control the on-state of the switch circuit 10, so as to control the state of the energy storage component 50 supplying power to the load. It will be appreciated that the detection process of the type identifying circuit 30 is as described above and will not be repeated here.

In some embodiments, the duty cycle of the first level in the first pwm signal is one hundred percent, and the first level causes the switching circuit 10 to be continuously on.

For example, the direct power supply may be a continuous power supply to the load, and the first pwm signal output by the main control circuit 40 can make the switching circuit 10 continuously conduct, so that the energy storage component 50 continuously supplies power to the load.

For example, the switch circuit 10 may be turned on or off by the received first pulse width signal, and specifically, the switch circuit 10 is turned on when the received first pulse width signal is at the first level, so that the switch circuit 10 is continuously turned on when the duty ratio of the first level is one hundred percent.

The first level may be a high level or a low level, and the first level is a high level or a low level depending on the design of the switch circuit 10. The first level and the specific embodiment of the switch circuit 10 are not limited, and the switch circuit 10 may be in the on state when receiving the first pwm signal of the first level.

In some embodiments, the first type of load to be directly powered comprises a load of an electrical component.

Illustratively, the switching circuit 10 is controlled to be continuously turned on, so that the energy storage component 50 continuously supplies power to the load including the electric component to drive the load including the electric component.

Specifically, the load including the power consuming component may include an electric tool such as an air pump, a vacuum cleaner, a car washer, an electric wrench, or other power consuming appliances, and the load including the power consuming component is not limited herein.

In some embodiments, as shown in fig. 9, the switching circuit 10 includes a push-pull circuit 11, a first field effect transistor Q1, and a second field effect transistor Q2.

The gate of the first field effect transistor Q1 is connected to the drain of the second field effect transistor Q2 through the push-pull circuit 11, the source of the first field effect transistor Q1 is connected to the energy storage component 50, the drain of the first field effect transistor Q1 is connected to the interface circuit 20, the source of the second field effect transistor Q2 is grounded, and the gate of the second field effect transistor Q2 is configured to receive the pulse width modulation signal output by the main control circuit 40, so that the second field effect transistor Q2 is turned on or off, and the first field effect transistor Q1 is controlled to be turned on or off.

Illustratively, the second fet Q2 is turned on or off according to the pwm signal output by the main control circuit 40, and the second fet Q2 is turned on or off to control the first fet Q1 to be turned on or off, thereby turning on or off the switching circuit 10.

For convenience of description, the following embodiments will be described by taking the case where the switching circuit 10 is turned on when the first level is the high level as an example.

In some embodiments, the second fet Q2 is configured to turn on when receiving a high level pwm signal and to turn off when receiving a low level pwm signal; the push-pull circuit 11 is configured to set the gate of the first fet Q1 to a low level when the second fet Q2 is turned on, and is further configured to set the gate of the first fet Q1 to a high level when the second fet Q2 is turned off; the first fet Q1 is configured to be turned on when the gate of the first fet Q1 is at a low level, and is further configured to be turned off when the gate of the first fet Q1 is at a high level.

Illustratively, the second fet Q2 is turned on when receiving the pwm signal as a high level signal, and when the second fet Q2 is turned on, the gate of the first fet Q1 is set to a low level by the action of the push-pull circuit 11, so as to turn on the first fet Q1, thereby implementing the on-state of the switching circuit 10.

It is to be understood that in other embodiments, the second fet Q2 is turned off when receiving the pwm signal low, and when the second fet Q2 is turned off, the gate of the first fet Q1 is set high by the action of the push-pull circuit 11, so that the first fet Q1 is turned off, thereby turning off the switch circuit 10.

Specifically, when the main control circuit 40 outputs the signal, the second fet Q2 is turned on, and at this time, since the second fet Q2 is turned on, the first fet Q1 is also turned on by the action of the push-pull circuit 11, so that the switch circuit 10 is in a conducting state.

In some embodiments, the first fet Q1 may be a PMOS transistor and the second fet may be an NMOS transistor, as shown in fig. 10, the push-pull circuit 11 includes a first transistor Q3 and a second transistor Q4, and it is understood that the first transistor Q3 and the second transistor Q4 have opposite polarities.

The first transistor Q3 may be an N-type transistor, and the second transistor Q4 may be a P-type transistor.

Specifically, in the switching circuit 10, the gate of the second fet Q2 is connected to the main control circuit 40 for receiving the pwm signal, and the source of the second fet Q2 is grounded; the drain electrode of the second field effect transistor Q2 is connected with the base electrode of the second triode Q4, the base electrode of the first triode Q3 and the source electrode of the first field effect transistor Q1; the collector of the first triode Q3 is connected with the source of the first field effect transistor Q1, the emitter of the first triode Q3 is connected with the grid of the first field effect transistor Q1, the emitter of the first triode Q3 is also connected with the emitter of the second triode Q4, and the collector of the second triode Q4 is grounded.

It can be understood that the gate of the second fet Q2 is turned off when receiving the low level pwm signal, in this state, the base of the first transistor Q3 and the base of the second transistor Q4 are both in the high level state, the first transistor Q3 is turned on, the second transistor Q4 is turned off, the gate of the first fet Q1 is in the high level state, and the first fet Q1 is turned off, so that the switching circuit 10 is turned off.

When the gate of the second fet Q2 receives the pwm signal and changes from low level to high level, the second fet Q2 is turned on, and the base of the first transistor Q3 and the base of the second transistor Q4 are set to low level, the first transistor Q3 is turned off, the second transistor Q4 is turned on, so that the gate of the first fet Q1 is set to low level, and the first fet Q1 is turned on, thereby achieving the effect of turning on the switching circuit 10.

It can be understood that, by pulse modulation signals, the conducting states of the first fet Q1 and the second fet Q2 in the switch circuit 10 can be controlled, so as to implement different ways of supplying power to the load.

Illustratively, for the protection circuit, the switch circuit 10 further includes an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13. The eleventh resistor R11 is connected between the base of the first triode Q3 and the source of the first field effect transistor Q1; the twelfth resistor R12 is connected between the main control circuit 40 and the grid of the second field effect transistor Q2; one end of the thirteenth resistor R13 is connected to the gate of the second fet Q2, and the other end is grounded.

In other embodiments, when the voltage of the interface circuit 20 externally connected to the load is greater than the first preset voltage threshold, the main control circuit 40 is further configured to determine, according to the detection result, that the type of the load includes a second type that needs constant-current power supply.

Similarly, when the main control circuit 40 obtains the detection result of the first load detection circuit 31, the detection result is compared with the first preset voltage threshold, and if the voltage indicated by the detection result is greater than the first preset voltage threshold, the main control circuit 40 determines that the type of the currently accessed load is the second type requiring constant-current power supply.

Illustratively, after the main control circuit 40 determines that the type of the load is the second type requiring constant-current power supply, the pulse width modulation signal is modulated to control the switching circuit 10 to be turned on or off, so as to control the state of the energy storage component 50 supplying power to the load. It is understood that the control of the switch circuit 10 to be turned on or off by the pwm signal outputted from the main control circuit 40 can refer to the above embodiments, and the description is not repeated again.

It can be understood that the first load detection circuit 31 detects the voltage of the interface circuit 20, and transmits the detection result to the main control circuit 40, so that the main control circuit 40 controls the switch circuit 10, thereby achieving the purpose of controlling the energy storage component 50 to supply power to the load, so as to supply power to different loads in different manners.

In some embodiments, in the case that the type of the load includes a second type that requires constant-current power supply, the main control circuit 40 is further configured to obtain an output current of the energy storage component 50 for supplying power to the load, and determine the second pulse width modulation signal according to the second type and the output current; the switching circuit 10 is configured to control the energy storage component 50 to supply a constant current to the load based on the second pwm signal.

For example, the second pwm signal can control the on or off state of the switch circuit 10, that is, in one signal period of the second pwm signal, the switch circuit 10 has both the on time and the off time, so as to achieve the purpose of constant current power supply.

In some embodiments, the second type of load requiring constant current supply comprises a load of a chargeable component.

For example, the load including the chargeable component may be a battery, and it is understood that when the battery is charged, if the same power supply manner as that for the load including the electric component is used, a large current protection of the load including the chargeable component may be triggered, so that the load including the chargeable component cannot be charged.

Illustratively, when the main control circuit 40 identifies that the type of the connected load is the second type, the current detection circuit 70 obtains the output current, and outputs a second pulse width modulation signal according to the output current and the identification result, it can be understood that the duty ratio of the first level in the second pulse width is not one hundred percent, so that the switching circuit 10 has both the on time and the off time in one cycle, thereby realizing that the energy storage component 50 supplies the constant current to the load.

For example, the duty ratio of the first level in the second pwm signal may be adjusted by the obtained output current to adjust the magnitude of the output current.

For convenience of description, the following embodiments will be described by taking the first level as a high level and the first level turns on the switch circuit 10 as an example. It will be appreciated that the manner in which the first level turns on the switch circuit 10 may refer to the foregoing embodiments and will not be repeated here.

For example, when the second pwm signal is at the first level, the switching circuit 10 is turned on, and the energy storage component 50 supplies power to the load; and when the second pwm signal is at the second level, the switching circuit 10 is turned off, the energy storage component 50 cannot supply power to the load, and the output current for supplying power to the load can be adjusted according to the duty ratio of the first level and the second level in the second pwm signal.

Specifically, if the obtained output current is small and the output current needs to be increased, the duty ratio of the first level in the second pulse width modulation signal is increased to increase the output current. And if the acquired output current is larger, reducing the duty ratio of the first level in the second pulse width modulation signal so as to reduce the output current. Therefore, the main control circuit 40 can adjust the magnitude of the output current according to the acquired output current.

In some embodiments, the power supply circuit is applied to a vehicle emergency starting power supply, the interface circuit 20 can be used for connecting a storage battery on the vehicle, and the energy storage assembly 50 can provide current to the vehicle through the switching circuit 10 and the interface circuit 20, so that the vehicle is started.

For example, the battery may be used as a load connected to the power supply circuit, and the battery may be supplied with current in the manner described with reference to the foregoing embodiments to implement vehicle starting.

The power supply circuit provided by the above embodiment includes a switch circuit 10, an interface circuit 20, a type identification circuit 30, and a main control circuit 40. The interface circuit 20 is used for externally connecting a load and is connected with the energy storage assembly 50 through the switch circuit 10, and the energy storage assembly 50 can supply power to the load externally connected with the interface circuit 20 through the switch circuit 10 and the interface circuit 20; the type identification circuit 30 can identify the type of the load externally connected to the interface circuit 20, so that the main control circuit 40 can determine the pwm signal according to the type of the load and transmit the pwm signal to the switch circuit 10, so as to control the state of the energy storage component 50 supplying power to the load through the switch circuit 10. The type identification circuit 30 can identify the type of the load connected to the power supply circuit, and the main control circuit 40 can control the switch circuit 10 to be switched on or switched off according to the identification result, so that different types of loads can be supplied with power in different modes, and the applicability of the power supply circuit is improved.

The application also provides an output method of the starting power supply, which is used for starting the power supply, wherein the starting power supply can be a portable power supply, such as an emergency starting power supply of a vehicle; as shown in fig. 11, the method includes steps S101 to S103.

It should be noted that the output method of the start-up power supply can be specifically applied to the main control circuit 40 of the power supply circuit provided in the above embodiment, and the output method of the start-up power supply will be described below with reference to the power supply circuit, but it should be understood that the output method of the start-up power supply is not limited to the power supply circuit provided in the above embodiment.

And step S101, determining the type of a load connected with the starting power supply.

For example, when a load is connected to the starting power supply, the type of the load is determined so as to provide different power supply modes for different loads.

In some embodiments, the types of loads include a first type requiring direct power and a second type requiring constant current power.

For example, the first type of load to be directly powered may be a load comprising an electrical component, such as a pump, a vacuum cleaner. The second type of load requiring constant current supply may be a load comprising a chargeable component, such as a battery.

For example, if a load including a rechargeable component is powered by a power supply method of the load including the power consumption component, a large-current protection of the load of the rechargeable component is triggered, so that the load of the rechargeable component cannot be powered, and thus different power supply methods are required to supply power to different types of loads.

Exemplarily, the starting power supply can supply power to different loads through the same interface, and the applicability of the starting power supply can be improved.

In some embodiments, the determining the type of load connected to the start-up power supply comprises: if the interface of the starting power supply is connected with a load, detecting a first voltage of the interface of the starting power supply to obtain a detection result; and determining the type of the load according to the detection result.

For example, the detection result may be generated by detecting a first voltage of an interface connected to the load to determine the type of the load according to the detection result.

Specifically, the method for determining the type of the load may be applied to the power supply circuit of the foregoing embodiment, for example, the first load detection circuit 31 may detect the first voltage of the interface for starting the power supply, and obtain the detection result. And transmitting the detection result to the main control circuit 40 so that the main control circuit 40 can determine the type of the load according to the detection result. Please refer to the foregoing embodiments for specific steps, which will not be repeated herein.

It is understood that the detection result may be the first voltage, or may be a current signal, a level signal, an optical signal or other signals obtained by the first voltage.

For example, the detection result is a first voltage, a first voltage threshold may be preset, and the first voltage is compared with the first voltage threshold to determine the type of the load according to the comparison result.

In some embodiments, if the first voltage is less than or equal to the first preset voltage threshold, it may be determined that the type of the load includes a first type requiring direct power supply.

For example, the first type of load may be an electrical appliance, when the first type of load is connected to the starting power supply, since there is no power supply inside the electrical appliance, the voltage of the interface may not change, the detected first voltage may be 0V, and the first preset voltage threshold may be set to 0, so that when the detected first voltage is less than or equal to the first preset voltage threshold, it is determined that the type of load is the first type that needs to be directly powered.

In other embodiments, if the first voltage is greater than the first preset voltage threshold, it may be determined that the type of the load includes a second type requiring constant current power supply.

For example, the second type of load may be a battery, when the battery is connected to the starting power supply, the potential of the interface may change due to the power supply inside the battery, so that the detected first voltage is not 0V, and the first preset voltage threshold may be set to 0, so that when the detected first voltage is greater than the first preset voltage threshold, the load type is determined to be the second type requiring constant current power supply.

For example, the corresponding pulse width modulation signal may be generated according to the determined load type, so that the start power supply supplies power to the load in different manners.

And step S102, determining a pulse width modulation signal according to the type of the load.

For example, the power supply mode of the starting power source to the load may be controlled by the pwm signal, and thus the corresponding pwm signal needs to be determined according to the type of the load.

Illustratively, the first pwm signal is determined if the type of load is a first type requiring direct power.

Illustratively, the second pwm signal is determined if the type of the load is a second type requiring constant current supply. It will be appreciated that the duty cycle of the first level in the first pulse width modulated signal is not equal to the duty cycle of the first level in the second pulse width modulated signal. Specifically, the duty ratio of the first level in the first pulse width modulation signal may be greater than the duty ratio of the first level in the second pulse width modulation signal, so as to implement that the start power supply supplies power to the load through different power supply modes.

And step S103, controlling the conduction state of a switch circuit of the starting power supply according to the pulse width modulation signal so as to control the state that the starting power supply supplies power to the load.

Illustratively, the conducting state of a switch circuit in the starting power supply is controlled by a pulse width modulation signal, so as to control the state of the starting power supply supplying power to the load. It will be appreciated that, with reference to the foregoing embodiment, the switch circuit is connected between the energy storage component and the interface in the starting power supply, so as to control the state of the starting power supply supplying power to the load through the conducting state of the switch circuit.

In some embodiments, the determining a pulse width modulation signal is based on a type of the load; controlling the conducting state of a switch circuit of the starting power supply according to the pulse width modulation signal so as to control the state that the starting power supply supplies power to the load, and the method comprises the following steps: if the type of the load comprises a first type needing direct power supply, determining a first pulse width modulation signal; and controlling the conducting state of the switch circuit according to the first pulse width modulation signal so as to control the starting power supply to directly supply power to the load.

Illustratively, if the type of the load includes a first type requiring direct power supply, for example, the load is an air pump, the first pwm signal is determined to control the on-state of a switching circuit in the starting power supply, so that the starting power supply directly supplies power to the load.

Specifically, the pulse width modulation signal is determined according to the type of the load; and the method for controlling the conducting state of the switch circuit of the start power supply according to the pulse width modulation signal may be applied to the power supply circuit of the foregoing embodiment, for example, the main control circuit 40 in the start power supply determines the first pulse width signal and outputs the first pulse width signal to the switch circuit 10, so as to control the switch circuit 10 to be continuously conducting, thereby achieving the purpose of direct power supply. For the specific process, please refer to the foregoing embodiments, which will not be repeated herein.

In some embodiments, the duty cycle of the first level in the first pwm signal is one hundred percent, and the first level controls the switching circuit to be continuously on.

For example, the first level may be a high level or a low level, and it should be noted that when the switching circuit receives the first pwm signal as the first level, the switching circuit is turned on.

It can be understood that, in the present application, it is only necessary to implement the conduction when the first pwm signal received by the switch circuit is at the first level, and the type of the first level and the specific structure of the switch circuit are not limited.

In some embodiments, the switch circuit 10 provided in the foregoing embodiments may be referred to, so as to turn on when receiving the first pwm signal at the first level.

In other embodiments, the determining a pwm signal according to the type of the load and controlling a conducting state of a switching circuit of the start power supply according to the pwm signal to control a state in which the start power supply supplies power to the load includes: if the type of the load comprises a second type requiring constant current power supply, acquiring the output current of the starting power supply, and determining a second pulse width modulation signal; and controlling the conduction state of the switch circuit according to the output current and the second pulse width modulation signal so as to control the starting power supply to supply power to the load at a constant current.

Illustratively, if the type of the load is a second type requiring constant-current power supply, the output current of the starting power supply is acquired, and the second pulse width modulation signal is determined, so that the constant-current power supply of the starting power supply to the load is realized through the on or off of the output current and the second pulse width modulation signal switching circuit.

For example, the output current of the start-up power supply may be the output current at any of the internal circuits of the start-up power supply.

Illustratively, the duty ratio of the first level in the second pulse width modulation signal is not one hundred percent, so that the switching circuit has both on time and off time in one signal period, thereby realizing constant-current power supply.

For example, the conducting state of the switch circuit can be controlled according to the magnitude of the output current so as to adjust the magnitude of the output current of the starting power supply. For example, if the output current is too large, the ratio of the off duration of the switch circuit to the time of one signal period can be increased to achieve the purpose of reducing the output current.

Specifically, the off duration of the switching circuit can be increased by the pulse modulation signal according to the time ratio of one signal period, and reference may be made to the switching circuit 10 provided in the foregoing embodiment, and description thereof will not be repeated here.

The switch circuit is controlled to be continuously switched on or switched on and off in a signal period, so that direct power supply or constant-current power supply to the load is realized, and the applicability of the starting power supply is improved.

In some embodiments, before determining the type of load connected to the start-up power supply, further comprising: and detecting whether the interface of the starting power supply is externally connected with a load, and controlling the switch circuit to be in a turn-off state if the interface of the starting power supply is not externally connected with the load.

For example, if it is determined that the interface of the start-up power supply is not externally connected with a load, the switch circuit is controlled to be in an off state, so that the energy storage assembly in the start-up power supply cannot output current to the interface, thereby avoiding the occurrence of electric leakage and saving energy.

Illustratively, the switching circuit may be controlled to be in an off state by a pulse width modulation signal.

It can be understood that, if the interface of the start power supply is not externally connected with a load, the control switch circuit is in the off state through other manners, which is not limited in the present application.

In some embodiments, the detecting whether the interface of the start power supply is externally connected with a load includes: acquiring a second voltage of an interface of the starting power supply; and if the second voltage is greater than or equal to a second preset voltage threshold value, determining an external load of an interface of the starting power supply.

Illustratively, whether an external load exists on the interface of the starting power supply is determined by obtaining a second voltage of the interface of the starting power supply and comparing the second voltage with a second preset voltage threshold.

It is understood that if the second voltage is greater than or equal to the second preset voltage threshold, it may be determined that the load is connected to the interface for starting the power supply.

Specifically, the method for detecting whether the interface of the power supply is externally connected to the load may be applied to the embodiment provided by the power supply circuit, for example, the second load detection circuit 80 may obtain the second voltage of the interface of the power supply to be started, compare the second voltage with the second preset voltage threshold value through the main control circuit 40, and determine the pulse width modulation signal according to the comparison result to control the switch circuit 10, so as to realize no current output when the power supply is not externally connected to the load. The specific steps can be referred to the previous embodiments and are not repeated here.

In some embodiments, the detecting whether the interface of the start power supply is externally connected with a load includes: acquiring a second voltage of an interface of the starting power supply; and if the second voltage is smaller than a second preset voltage threshold value, determining that the interface of the starting power supply is not externally connected with a load.

It can be understood that if the second voltage is less than the second preset voltage threshold, it is determined that the interface for starting the power supply is not externally connected with the load.

In some embodiments, the method further comprises: acquiring the output current of the starting power supply; and adjusting the duty ratio of the pulse width modulation signal according to the magnitude of the output current so as to make the output current constant.

For example, for various reasons, there may be some loss of current in the circuit, so that there is fluctuation in the current of the output of the start-up power supply, and the duty ratio of the pulse width modulation signal may be adjusted to make the output current of the start-up power supply constant.

Specifically, when the load is supplied with the constant current, the constant current supply to the second type load can be realized and the output current is constant by obtaining the output current and adjusting the duty ratio of the pulse width modulation signal according to the output current. The method for obtaining the output current and adjusting the pwm signal according to the output current can be applied to the current detection circuit 70 provided in the foregoing embodiments, and specific steps can refer to the foregoing embodiments, which are not repeated herein.

The output method of the starting power supply provided by the above embodiment includes determining the type of a load connected to the starting power supply; determining a pulse width modulation signal according to the type of the load; and controlling the conduction state of a switch circuit of the starting power supply according to the pulse width modulation signal so as to control the state of the starting power supply supplying power to the load. The corresponding pulse width modulation signals are generated through the determined load types, so that the purpose that the starting power supply supplies power to different types of loads in different modes is achieved, and the applicability of the starting power supply is improved.

The present application further provides a starting power supply, which includes a housing and the power supply circuit provided in any one of the above embodiments, wherein at least a part of the power supply circuit is disposed in the housing.

For example, the energy storage component 50 of the power supply circuit may be disposed in the housing, and the switch circuit 10 may be disposed in the housing, and may be disposed according to actual conditions, which is not limited herein.

It is to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments. While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A power supply circuit, comprising:

a switching circuit;

the master control circuit is used for determining a pulse width modulation signal according to the type of the load;

the switch circuit is used for controlling the state of the energy storage component for supplying power to the load based on the pulse width modulation signal.

2. The power supply circuit of claim 1, further comprising:

the current detection circuit is used for detecting the output current of the energy storage assembly for supplying power to the load, and the main control circuit is used for adjusting the duty ratio of the pulse width modulation signal according to the output current so as to enable the output current to be constant.

3. The power supply circuit according to claim 1, wherein, in a case that the type of the load includes a first type requiring direct power supply, the main control circuit determines a first pulse width modulation signal according to the first type; the switching circuit is used for controlling the energy storage component to directly supply power to the load based on the first pulse width modulation signal.

4. The power supply circuit of claim 3, wherein the first level of the first PWM signal is one hundred percent duty cycle, and wherein the first level causes the switching circuit to be continuously turned on.

5. The power supply circuit of claim 3, wherein the first type of load to be directly powered comprises a load of a powered component.

6. The power supply circuit according to claim 1, wherein in a case that the type of the load includes a second type requiring constant current power supply, the main control circuit is further configured to obtain an output current of the energy storage component for supplying power to the load, and determine the second pulse width modulation signal according to the second type and the output current; the switch circuit is used for controlling the energy storage assembly to supply power to the load in a constant current mode based on the second pulse width modulation signal.

7. The power supply circuit according to claim 6, wherein the second type of load requiring constant current power supply comprises a load of a chargeable component.

8. The power supply circuit of claim 1, wherein the type identification circuit comprises:

the first load detection circuit is connected with the interface circuit and the main control circuit and is used for detecting the voltage of the interface circuit when the interface circuit is externally connected with a load to obtain a detection result;

wherein the main control circuit is further configured to determine the type of the load according to the detection result.

9. The power supply circuit of claim 8, wherein when the voltage of the interface circuit externally connected to the load is less than or equal to a first preset voltage threshold, the main control circuit is further configured to determine, according to the detection result, that the type of the load includes a first type that needs to be directly powered.

10. The power supply circuit according to claim 8, wherein when the voltage of the interface circuit externally connected to the load is greater than a first preset voltage threshold, the main control circuit is further configured to determine, according to the detection result, that the type of the load includes a second type that requires constant-current power supply.

11. The power supply circuit of claim 1, further comprising:

the second load detection circuit is connected with the interface circuit and is used for detecting the condition of an external load of the interface circuit;

and under the condition that the second load detection circuit detects that the interface circuit is not externally connected with a load, the switch circuit is in an off state so as to prevent the energy storage assembly from outputting power supply.

12. The power supply circuit of claim 1, wherein the switching circuit comprises:

a push-pull circuit;

the grid electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor through the push-pull circuit, the source electrode of the first field effect transistor is connected with the energy storage component, and the drain electrode of the first field effect transistor is connected with the interface circuit; the source electrode of the second field effect transistor is grounded, and the grid electrode of the second field effect transistor is used for receiving the pulse width modulation signal output by the main control circuit, so that the second field effect transistor is switched on or switched off, and the first field effect transistor is controlled to be switched on or switched off.

13. The power supply circuit according to claim 12, wherein the second fet is configured to turn on when receiving a high level pwm signal and to turn off when receiving a low level pwm signal;

the push-pull circuit is used for setting the grid electrode of the first field effect transistor to be at a low level when the second field effect transistor is switched on, and is also used for setting the grid electrode of the first field effect transistor to be at a high level when the second field effect transistor is switched off;

the first field effect transistor is used for being switched on when the grid electrode of the first field effect transistor is at a low level and is also used for being switched off when the grid electrode of the first field effect transistor is at a high level.

14. The power supply circuit of claim 1, wherein the power supply circuit is applied to a vehicle emergency starting power supply, the interface circuit is capable of being used for connecting a vehicle storage battery, and the energy storage assembly supplies current to a vehicle through the switch circuit and the interface circuit so as to realize vehicle starting.

15. An output method of a start-up power supply, the method comprising:

determining a type of a load connected to the starting power supply;

determining a pulse width modulation signal according to the type of the load;

and controlling the conduction state of a switch circuit of the starting power supply according to the pulse width modulation signal so as to control the state of the starting power supply supplying power to the load.

16. The output method of claim 15, wherein the types of the load include a first type requiring direct power supply and a second type requiring constant current power supply.

17. The output method of claim 16, wherein the determining a pulse width modulated signal is based on a type of the load; controlling the conducting state of a switch circuit of the starting power supply according to the pulse width modulation signal so as to control the state that the starting power supply supplies power to the load, and the method comprises the following steps:

18. The output method of claim 17, wherein the duty cycle of the first level in the first pwm signal is one hundred percent, and wherein the first level controls the switching circuit to be continuously on.

19. The output method of claim 16, wherein the determining a pwm signal according to the type of the load and controlling the on-state of the switch circuit of the start-up power supply according to the pwm signal to control the power supply of the start-up power supply to the load comprises:

if the type of the load comprises a second type requiring constant current power supply, acquiring the output current of the starting power supply, and determining a second pulse width modulation signal;

20. The output method of any of claims 15-19, wherein the determining the type of load connected to the startup power supply comprises:

if the interface of the starting power supply is connected with a load, detecting a first voltage of the interface of the starting power supply to obtain a detection result;

and determining the type of the load according to the detection result.

21. The output method of claim 20, wherein the determining the type of the load according to the detection result comprises:

and if the first voltage is less than or equal to a first preset voltage threshold, determining that the type of the load comprises a first type needing direct power supply.

22. The output method of claim 20, wherein the determining the type of the load according to the detection result comprises:

and if the first voltage is greater than the first preset voltage threshold, determining that the type of the load comprises a second type requiring constant-current power supply.

23. The output method according to claim 15, characterized in that the output method further comprises:

detecting whether an interface of the starting power supply is externally connected with a load or not;

24. The output method of claim 23, wherein the detecting whether the interface of the start-up power supply is externally connected with a load comprises:

acquiring a second voltage of an interface of the starting power supply;

and if the second voltage is greater than or equal to a second preset voltage threshold value, determining an external load of an interface of the starting power supply.

25. The output method of claim 23, wherein the detecting whether the interface of the start-up power supply is externally connected with a load comprises:

acquiring a second voltage of an interface of the starting power supply;

26. The output method of claim 15, further comprising:

acquiring the output current of the starting power supply;

27. A starting power supply, characterized in that it comprises a housing and a supply circuit according to any one of claims 1-14, which supply circuit is at least partly structurally arranged in the housing.