CN218958790U - Load starting circuit and power supply circuit - Google Patents

Abstract

The application provides a load starting circuit and power supply circuit, load starting circuit includes switch sub-circuit, charge-discharge sub-circuit and steady voltage sub-circuit, wherein: the power-taking end of the switch sub-circuit is connected with the direct electric energy output end, the power transmission end of the switch sub-circuit is connected with the charge-discharge sub-circuit, the controlled end of the switch sub-circuit is connected with the signal output end, and the switch sub-circuit is used for switching on or switching off the connection between the direct electric energy output end and the charge-discharge sub-circuit according to the signal output by the signal output end; the charge-discharge sub-circuit is connected with one or more loads through the voltage stabilizing sub-circuit, and is used for supplying power to the loads through the voltage stabilizing sub-circuit when the connection between the direct electric energy output end and the charge-discharge sub-circuit is conducted so as to start the loads; the voltage stabilizing sub-circuit is used for limiting the voltage provided by the charge-discharge sub-circuit to the load. The technical scheme has simple circuit and saves cost.

Description

Load starting circuit and power supply circuit

Technical Field

The present application relates to the field of circuits, and in particular to a load starting circuit and a power supply circuit.

Background

In current power supply designs, the power supply circuit is generally composed of a plurality of functional module circuits, and the power supply circuit may specifically include a flyback module circuit, a power factor correction (power factor correction, PFC) module circuit, a resonant conversion (LLC) module circuit, and a backlight module circuit. Different functional module circuits have different corresponding starting voltages, i.e. the voltages required for starting the functional module circuits are different. For example, the start-up voltage of the LLC module circuit is 12V, and the start-up voltage of the flyback module circuit is 16V.

Since the starting voltages of the different functional module circuits are different, in order for the power supply circuit to operate normally, different starting voltages need to be supplied to the different functional module circuits to start each of the functional module circuits in the power supply circuit. In order to be able to start each functional module circuit, an auxiliary power supply needs to be designed in the power supply circuit for each load for providing different starting voltages to different loads. Additional power chips are required for designing the auxiliary power supply, and the power chips generate additional power consumption and increase the cost of the power circuit.

Disclosure of Invention

The application provides a load starting circuit and a power supply circuit to solve the technical problems of extra power consumption and high cost caused by designing an auxiliary power supply in the power supply circuit.

In a first aspect, the present application provides a load starting circuit comprising a switch sub-circuit, a charge-discharge sub-circuit and a voltage stabilizing sub-circuit, wherein:

the power-taking end of the switch sub-circuit is connected with the direct electric energy output end, the power transmission end of the switch sub-circuit is connected with the charge-discharge sub-circuit, the controlled end of the switch sub-circuit is connected with the signal output end, and the switch sub-circuit is used for switching on or switching off the connection between the direct electric energy output end and the charge-discharge sub-circuit according to the signal output by the signal output end;

the charge-discharge sub-circuit is connected with one or more loads through the voltage stabilizing sub-circuit, and is used for supplying power to the loads through the voltage stabilizing sub-circuit when the connection between the direct electric energy output end and the charge-discharge sub-circuit is conducted so as to start the loads;

the voltage stabilizing sub-circuit is used for limiting the voltage provided by the charge-discharge sub-circuit to the load.

In one possible design, the switch sub-circuit includes a first transistor unit and a second transistor unit, each including a transistor; the first end of the first transistor unit is connected with the signal output end, the second end of the first transistor unit is connected with the first end of the second transistor unit, and the first transistor unit is used for controlling the on-off of transistors in the second transistor unit according to signals output by the signal output end; the second end of the second transistor unit is connected with the direct electric energy output end, the third end of the second transistor unit is connected with the charge-discharge electronic circuit, and the second transistor unit is used for controlling connection and disconnection between the direct electric energy output end and the charge-discharge electronic circuit.

In one possible design, the first transistor cell includes a first resistor, a second resistor, and a first transistor; one end of the first resistor is connected with the signal output end, the other end of the first resistor is connected with the controlled end of the first transistor and one end of the second resistor, the other end of the second resistor is connected with the power end of the first transistor and grounded, and the controlled response end of the first transistor is connected with the first end of the second transistor unit.

In one possible design, the first transistor unit further includes a filter capacitor connected in parallel with the second resistor.

In one possible design, the second transistor unit includes a third resistor, a fourth resistor, and a second transistor; one end of the third resistor is connected with the second end of the first transistor unit, the other end of the third resistor is connected with one end of the fourth resistor and the controlled end of the second transistor, the other end of the fourth resistor is connected with the power end of the second transistor and the direct electric energy output end, and the controlled response end of the second transistor is connected with one end of the charge-discharge electronic circuit.

In one possible design, the voltage stabilizing sub-circuit includes a fifth resistor and a voltage stabilizing tube; one end of the fifth resistor is connected with the charge-discharge electronic circuit and the output end of the voltage stabilizing tube, and the other end of the fifth resistor is connected with the input end of the voltage stabilizing tube and the grounding end of the voltage stabilizing tube and is grounded.

In one possible design, the charge-discharge electronic circuit includes an electrolytic capacitor, an anode of the electrolytic capacitor is connected with a power transmission end of the switch sub-circuit and the voltage stabilizing sub-circuit, and a cathode of the electrolytic capacitor is grounded.

In one possible design, the load starting circuit further includes a protection subcircuit; wherein: the power transmission end of the switch sub-circuit is connected with the charge and discharge sub-circuit through the protection sub-circuit, and the protection sub-circuit is used for protecting the switch sub-circuit.

In one possible design, the protection subcircuit includes a first diode; the anode of the first diode is connected with the power transmission end of the switch sub-circuit, and the cathode of the first diode is connected with one end of the charge-discharge sub-circuit.

In a second aspect, a power supply circuit is provided, including a power supply, a control module, at least one load, and at least one load starting circuit according to the first aspect; wherein:

the load starting circuit is connected among the direct electric energy output end of the power supply, the signal output end of the control module and the load, and is used for taking electricity from the direct electric energy output end of the power supply and supplying the electricity to the load under the control of the control module so as to start the load.

The application can realize the following technical effects: the load starting circuit in this application, including switch sub-circuit, charge-discharge sub-circuit and steady voltage sub-circuit, wherein: the power-taking end of the switch sub-circuit is connected with the direct electric energy output end, the power transmission end of the switch sub-circuit is connected with the charge-discharge sub-circuit, the controlled end of the switch sub-circuit is connected with the signal output end, and the switch sub-circuit is used for switching on or switching off the connection between the direct electric energy output end and the charge-discharge sub-circuit according to the signal output by the signal output end; the charge-discharge sub-circuit is connected with one or more loads through the voltage stabilizing sub-circuit, and is used for supplying power to the loads through the voltage stabilizing sub-circuit when the connection between the direct electric energy output end and the charge-discharge sub-circuit is conducted so as to start the loads, and the voltage stabilizing sub-circuit is used for limiting the voltage provided by the charge-discharge sub-circuit to the loads. The load starting circuit is arranged between the direct electric energy output end and the load, and can directly take electricity from the power supply end and supply the electricity to the load; when the load is not required to be started, the connection between the direct electric energy output end and the charge-discharge electronic circuit can be controlled through the signal output by the signal output end, so that the load starting circuit can not generate extra consumption, and the energy consumption can be saved.

Drawings

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

fig. 2A and fig. 2B are schematic diagrams illustrating positions of direct electrical energy output ends according to embodiments of the present application;

fig. 3 is a block diagram of a load starting circuit according to an embodiment of the present application;

fig. 4 is a block diagram of a switch sub-circuit according to an embodiment of the present application;

fig. 5 is a schematic circuit diagram of a load starting circuit according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The load starting circuit of the present application may be applied to a device power supply including a plurality of functional module circuits with different starting voltages, where the device power supply includes, but is not limited to, an automobile power supply, a mobile phone power supply, a computer power supply, and the like, and is not limited to the examples herein.

Referring first to fig. 1, fig. 1 is a schematic structural connection diagram of a power supply circuit according to an embodiment of the present application, where the power supply circuit may be a circuit in any device that operates based on a power supply. As shown in fig. 1, the power supply circuit 1 may include a power supply 10, a control module 20, at least one load 30, and at least one load activation circuit 40. Wherein: the load starting circuit 40 is connected between the direct power output terminal V0 of the power supply 10, the signal output terminal S0 of the control module 20, and the load 30, and the load starting circuit 40 is configured to take power from the direct power output terminal of the power supply 10 and provide the power to the load 30 under the control of the control module 20 to start the load 30.

The power supply 10 is a direct source of electric energy in the power supply circuit 1, and the electric energy provided by the power supply 10 can be provided for the load 30 after being rectified, filtered, current-limited and the like. The power supply 10 may be an ac power supply or a dc power supply. The direct power output end refers to a position point where the power supply 10 outputs total power, and the total power output by the power supply is equal to the sum of power required by each load; the voltage and current at the direct power output may directly reflect the voltage and current output by the power supply 10. Specifically, the current at the direct output end of the electric energy can be the current after rectifying the alternating current power supply; the position of the direct power output end can be shown in fig. 2A, and the point p1 in fig. 2A is the direct power output end V0. Alternatively, the current at the direct output end of the electric energy can also be a bridge-type rectified current; the position of the direct power output end can be shown in fig. 2B, and the point p2 in fig. 2B is the direct power output end V0. Not limited to these two cases, the position of the direct power output end may be more positions.

The control module 20 is a circuit unit for realizing various controls in the power supply circuit 1, and is used for controlling various circuit modules in the power supply circuit 1. For example, the control module 20 may control various loads 30 in the power supply circuit 1, control these loads to operate or stop operating; the control module 20 may also control the load starting circuit 40. The signal output end of the control module 20 refers to a port for outputting a control signal; the control module 20 may have a plurality of signal outputs through which the control module 20 may control different circuit modules. Specifically, the control module 20 includes, but is not limited to, a central processing unit (central processing unit, CPU), a micro control unit (microcontroller unit, MCU), a system on chip, and the like.

The load 30 refers to a power module in the power supply circuit 1, including but not limited to a flyback module, a PFC module, an LLC module, and the like. The starting voltage required by the different loads may be different, with starting voltage being the voltage required to drive the load to operate. The load 30 may also be connected to an auxiliary winding for powering the load 30 after the load is started.

The load starting circuit 40 is a circuit specially configured for starting a load, and the load starting circuit 40 may be composed of simple circuit components. The number of the load starting circuits 40 is related to the number of starting voltages required for each load in the power supply circuit 1, and one load starting circuit 40 corresponds to one starting voltage. Specifically, one load starting circuit 40 may be connected to a plurality of loads 30 having the same starting voltage for providing the plurality of loads 30 with the starting voltage. In the case where the start-up voltages required for the loads 30 in the power supply circuit 1 are different from each other, one load start-up circuit 40 is connected to one load 40. It should be appreciated that the specifications of the circuit components in one load starting circuit 40 are matched to the starting voltage required by the load to which the load starting circuit 40 is connected, so that the voltage provided to the load after the power provided by the power direct output end of the power supply passes through the load starting circuit is the starting voltage required by the load.

Specifically, the load starting circuit 40 may conduct the connection between the power direct output terminal V0 of the power supply 10 and the load under the control of the control module to draw power from the power direct output terminal V0 of the power supply 10 and provide the power to the load 30, so that the load 30 is started; alternatively, the load starting circuit 40 may disconnect the direct power output V0 of the power supply 10 from the load 30 under the control of the control module 20.

The load starting circuit formed by circuit components is arranged between the power supply and the load, and the load starting circuit takes power from the direct power output end of the power supply and supplies the power to the load, so that the voltage supplied to the load can meet the starting voltage required by the load, and the load is started; the load starting circuit is composed of basic circuit components, and the required cost is low; the load starting circuit can disconnect the direct power supply end of the power supply from the load under the control of the control module, so that the extra circuit consumption can be avoided, and the energy consumption of the power supply circuit can be saved.

Referring next to fig. 3, fig. 3 is a block diagram of a load starting circuit according to an embodiment of the present application, and as shown in fig. 3, the load starting circuit 40 includes a switch sub-circuit 401, a charge/discharge sub-circuit 402, and a voltage stabilizing circuit sub-circuit 403, where:

the power-taking end of the switch sub-circuit 401 is connected with the direct electric energy output end V0, the power transmission end of the switch sub-circuit 401 is connected with the charge-discharge sub-circuit 402, the controlled end of the switch sub-circuit 402 is connected with the signal output end S0, and the switch sub-circuit 401 is used for switching on or switching off the connection between the direct electric energy output end V0 and the charge-discharge sub-circuit 402 according to the signal output by the signal output end S0;

the charge-discharge sub-circuit 402 is connected with one or more loads 30 through the voltage stabilizing sub-circuit 403, and the charge-discharge sub-circuit 403 is used for supplying power to the loads 30 through the voltage stabilizing sub-circuit 403 when the connection between the direct power output terminal V0 and the charge-discharge sub-circuit is conducted, so as to start the loads 30;

the voltage regulator sub-circuit 403 is configured to limit the voltage provided by the charge and discharge sub-circuit 402 to the load 30.

The switch sub-circuit 401 may be any circuit with on-off function realized by circuit components; the charge and discharge electronic circuit 402 may be any circuit having a charge and discharge function realized by circuit components; the voltage stabilizing sub-circuit 403 may be any sub-circuit capable of realizing a voltage stabilizing function through circuit components.

The general principle of operation of the load starting circuit 40 is as follows: when the signal output by the signal output end S0 is used for indicating the switch sub-circuit 401 to be turned on, the switch sub-circuit 402 is turned on, so that the connection between the direct electric energy output end V0 and the charge and discharge sub-circuit 402 is turned on, the electric energy output by the direct electric energy output end V0 is provided to the load after being stabilized by the voltage stabilizing sub-circuit through the charge and discharge sub-circuit, and the voltage provided by the voltage stabilizing sub-circuit 402 to the load 30 is limited to the starting voltage, so that the load 30 can be started and the damage to the load 30 is avoided; when the signal output by the signal output terminal S0 is used to instruct the switch sub-circuit 401 to turn off, the switch sub-circuit 401 turns off, so that the connection between the power direct output terminal V0 and the charge/discharge sub-circuit 402 is disconnected, and the power supply to the load 30 is stopped.

In the technical scheme of fig. 3, the load circuit comprises a switch sub-circuit, a charge-discharge sub-circuit and a voltage stabilizing sub-circuit, and the starting of the load is realized through a simple circuit design, so that the complexity and the cost of the circuit can be reduced; the voltage stabilizing sub-circuit limits the voltage provided by the direct electric energy output end to the load to the starting voltage of the load, so that the damage of the load can be prevented; the switch sub-circuit can disconnect the connection between the direct electric energy output end and the charge and discharge sub-circuit under the control of the signal output by the signal output end when the load is not required to be started, so that extra consumption can be avoided, and energy consumption is saved.

Some implementations of the load start-up circuit are described in detail below. See fig. 4-5.

In some possible designs, the on-off control may be implemented by transistors, and the switching sub-circuit may be composed of two-stage transistor cells. Specifically, as shown in fig. 4, the switching sub-circuit 401 includes a first transistor unit 4011 and a second transistor unit 4012, each of the first transistor unit 4011 and the second transistor unit 4012 including a transistor; a first end of the first transistor unit 4011 is connected to the signal output end S0, a second end of the first transistor unit 4011 is connected to a first end of the second transistor unit 4012, and the first transistor unit 4011 is configured to control on/off of transistors in the second transistor unit 4012 according to a signal output by the signal output end S0; a second end of the second transistor unit 4012 is connected to the direct power output end V0, a third end of the second transistor unit 4012 is connected to one end of the charge-discharge sub-circuit 402, and the second transistor unit 4012 is used for controlling connection and disconnection between the direct power output end V0 and the charge-discharge sub-circuit 402. The switching sub-circuit is realized through the two-stage transistor unit, so that the switching sub-circuit is ensured to be simple enough, and meanwhile, misleading caused by the occurrence of faults of the transistor can be prevented, and the direct output end of electric energy can be prevented from always supplying power to the load charging and discharging sub-circuit.

The transistors in the transistor units (i.e., the first transistor unit or the second transistor unit) may be transistors, or may be MOS transistors. When the transistor is a triode, the base electrode of the triode is the controlled end of the transistor, the emitter electrode of the triode is the power supply end of the transistor, and the collector electrode of the triode is the controlled response end of the transistor. When the transistor is a MOS transistor, the grid electrode of the MOS transistor is the controlled end of the transistor, the source electrode of the MOS transistor is the power supply end of the transistor, and the drain electrode of the MOS transistor is the controlled response end of the transistor. The controlled terminal refers to a port for receiving a control signal, the power terminal refers to a port for connecting with a power source, the power source can comprise a power source port and a grounding port, and the controlled response terminal refers to a port for enabling a transistor to be turned on or off in response to the control signal received by the controlled terminal.

Specifically, as shown in fig. 5, the first transistor unit 4011 includes a first resistor R9, a second resistor R10, and a first transistor Q2; one end of the first resistor R9 is connected to the signal output end S0, the other end of the first resistor R9 is connected to the controlled end of the first transistor Q2 and one end of the second resistor R10, the other end of the second resistor R10 is connected to the power supply end of the first transistor Q2 and grounded, and the controlled response end of the first transistor Q2 is connected to the first end of the second transistor unit 4012.

Optionally, as shown in fig. 5, the first transistor unit further includes a filter capacitor C1, where the filter capacitor C1 is connected in parallel with the second resistor R10. Through setting up filter capacitor, can carry out the wave filtering to the signal of signal output part output, avoid signal interference to lead to the transistor misleading in the first transistor unit, realize the break-make accurate control to the switch sub-circuit.

Specifically, as shown in fig. 5, the second transistor unit includes a third resistor R8, a fourth resistor R5, and a second transistor Q1; one end of the third resistor R8 is connected to the second end of the first transistor unit 4011, the other end of the third resistor R8 is connected to one end of the fourth resistor R5 and the controlled end of the second transistor Q1, the other end of the fourth resistor R5 is connected to the power supply end of the second transistor Q1 and the direct power output end, and the controlled response end of the second transistor Q1 is connected to one end of the charge/discharge sub-circuit 402.

In some possible designs, the voltage regulator sub-circuit may implement a limitation of the voltage provided by the charge and discharge sub-circuit to the load based on the voltage regulator tube. Specifically, as shown in fig. 5, the voltage stabilizing sub-circuit includes a fifth resistor R7 and a voltage stabilizing tube ZD1; one end of the fifth resistor R7 is connected with the charge-discharge electronic circuit 402 and the output end of the voltage stabilizing tube ZD1, and the other end of the fifth resistor R7 is connected with the input end of the voltage stabilizing tube ZD1 and the ground end of the voltage stabilizing tube and is grounded. The voltage regulation of the charge and discharge electronic circuit to the load is realized through the voltage regulator tube, the circuit is simple, and the cost is low.

In some possible designs, the charge-discharge subcircuit may be charged or discharged based on capacitance. Specifically, as shown in fig. 5, the charge-discharge electronic circuit 402 includes an electrolytic capacitor E1, where an anode of the electrolytic capacitor E1 is connected to a power transmission end of the switch sub-circuit 401 and the voltage stabilizing sub-circuit 403, and a cathode of the electrolytic capacitor is grounded. The charge and discharge electronic circuit is realized through the capacitor, and the circuit is simple and low in cost.

In some possible cases, as shown in fig. 5, the load starting circuit further includes a protection subcircuit 404; wherein: the power transmission end of the switch sub-circuit 401 is connected with the charge and discharge sub-circuit 402 through the protection sub-circuit 404, and the protection sub-circuit 404 is used for protecting the switch sub-circuit 401. The protection sub-circuit is arranged between the charge and discharge sub-circuit and the output end of the switch sub-circuit, so that the damage to the switch sub-circuit during the discharge of the charge and discharge sub-circuit can be prevented, and the function of protecting the switch sub-circuit is realized.

In some possible designs, the load starting circuit may implement protection for the switch sub-circuit based on a diode. Specifically, as shown in fig. 5, the protection sub-circuit 404 includes a first diode D4; an anode of the first diode D4 is connected to a power transmission end of the switch sub-circuit 401, and a cathode of the first diode D4 is connected to one end of the charge/discharge sub-circuit 402.

Optionally, as shown in fig. 5, the load starting circuit may further include a sixth resistor R6, where an anode D4 of the first diode is connected to the power transmission terminal of the switching sub-circuit through the sixth resistor R6. The current limiting resistor is arranged between the switch sub-circuit and the protection sub-circuit, so that the flow flowing to the charge and discharge sub-circuit can be limited, and the safety of the circuit is ensured.

It should be understood that the specific circuit structures of the switch sub-circuit, the charge-discharge sub-circuit and the voltage stabilizing sub-circuit are different, and the specific operation principle of the load starting circuit is different. The following describes the specific operation principle of the load starting circuit with the specific circuit structure of the load starting circuit as shown in fig. 5:

when the signal output terminal S0 outputs a high level signal, the first transistor Q2 is turned on, and the base voltage of the second transistor Q1 is pulled down to a low level, so that the second transistor Q1 is turned on. The current output by the direct electric energy output end V0 flows to the electrolytic capacitor E1 through the second transistor Q1 to electrolytically charge the electrolytic capacitor E1, the voltage stabilizing tube ZD1 and the resistor R9 limit the charging voltage at two ends of the electrolytic capacitor E1, and the voltage provided for the load RL1 is controlled at the starting voltage of the load RL1, so that the load RL1 is started. After the load RL1 is started, the load RL1 is supplied with power from the auxiliary winding L1 connected to the load RL 1.

When the signal output terminal S0 outputs a low level signal, the first transistor Q2 is turned off, the base of the second transistor Q1 is at a high level, and the second transistor Q1 is also turned off. The current output by the direct electric energy output end V0 stops the electrolytic charging of the electrolytic capacitor E1, so that the power supply to the load is stopped, and the electric energy consumption is reduced.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims (10)

1. A load starting circuit, comprising a switch sub-circuit, a charge-discharge sub-circuit and a voltage stabilizing sub-circuit, wherein:

the power-taking end of the switch sub-circuit is connected with the direct electric energy output end, the power transmission end of the switch sub-circuit is connected with the charge-discharge sub-circuit, the controlled end of the switch sub-circuit is connected with the signal output end, and the switch sub-circuit is used for switching on or switching off the connection between the direct electric energy output end and the charge-discharge sub-circuit according to the signal output by the signal output end;

the charge-discharge sub-circuit is connected with one or more loads through the voltage stabilizing sub-circuit, and is used for supplying power to the loads through the voltage stabilizing sub-circuit when the connection between the direct electric energy output end and the charge-discharge sub-circuit is conducted so as to start the loads;

the voltage stabilizing sub-circuit is used for limiting the voltage provided by the charge-discharge sub-circuit to the load.

2. The load starting circuit of claim 1 wherein the switch sub-circuit comprises a first transistor unit and a second transistor unit, the first transistor unit and the second transistor unit each comprising a transistor;

the first end of the first transistor unit is connected with the signal output end, the second end of the first transistor unit is connected with the first end of the second transistor unit, and the first transistor unit is used for controlling the on-off of transistors in the second transistor unit according to signals output by the signal output end;

the second end of the second transistor unit is connected with the direct electric energy output end, the third end of the second transistor unit is connected with the charge-discharge electronic circuit, and the second transistor unit is used for controlling connection and disconnection between the direct electric energy output end and the charge-discharge electronic circuit.

3. The load starting circuit of claim 2 wherein the first transistor unit comprises a first resistor, a second resistor, and a first transistor;

one end of the first resistor is connected with the signal output end, the other end of the first resistor is connected with the controlled end of the first transistor and one end of the second resistor, the other end of the second resistor is connected with the power end of the first transistor and grounded, and the controlled response end of the first transistor is connected with the first end of the second transistor unit.

4. The load starting circuit of claim 3 wherein the first transistor cell further comprises a filter capacitor, the filter capacitor being in parallel with the second resistor.

5. The load starting circuit of claim 2 wherein the second transistor unit comprises a third resistor, a fourth resistor, and a second transistor;

one end of the third resistor is connected with the second end of the first transistor unit, the other end of the third resistor is connected with one end of the fourth resistor and the controlled end of the second transistor, the other end of the fourth resistor is connected with the power end of the second transistor and the direct electric energy output end, and the controlled response end of the second transistor is connected with the charge-discharge electronic circuit.

6. The load starting circuit of any one of claims 1-5 wherein the voltage regulator sub-circuit comprises a fifth resistor and a voltage regulator tube;

one end of the fifth resistor is connected with the charge-discharge electronic circuit and the output end of the voltage stabilizing tube, and the other end of the fifth resistor is connected with the input end of the voltage stabilizing tube and the grounding end of the voltage stabilizing tube and is grounded.

7. The load starting circuit according to any one of claims 1 to 5, wherein the charge-discharge electronic circuit comprises an electrolytic capacitor, the positive electrode of the electrolytic capacitor is connected with the power transmission end of the switch sub-circuit and the voltage stabilizing sub-circuit, and the negative electrode of the electrolytic capacitor is grounded.

8. The load starting circuit of any one of claims 1-5 further comprising a protection sub-circuit; wherein:

the power transmission end of the switch sub-circuit is connected with the charge and discharge sub-circuit through the protection sub-circuit, and the protection sub-circuit is used for protecting the switch sub-circuit.

9. The load starting circuit of claim 8 wherein the protection subcircuit comprises a first diode;

the anode of the first diode is connected with the power transmission end of the switch sub-circuit, and the cathode of the first diode is connected with the charge-discharge sub-circuit.

10. A power supply circuit comprising a power supply, a control module, at least one load and at least one load starting circuit according to any one of claims 1-9; wherein:

the load starting circuit is connected among the direct electric energy output end of the power supply, the signal output end of the control module and the load, and is used for taking electricity from the direct electric energy output end of the power supply and supplying the electricity to the load under the control of the control module so as to start the load.

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