A starting load capacity enhancing auxiliary circuit and power supply

Abstract

The embodiment of the present invention discloses a startup load capacity enhancement auxiliary circuit and a power supply. When the startup load capacity enhancement auxiliary circuit is started, the first switch and the second switch are in the off state, the energy storage unit is charged through the current limiting resistor, the voltage acquisition circuit acquires the voltage at the output end of the energy storage unit and sends the acquired voltage to the controller, and the controller compares the acquired voltage with the voltage output by a preset power supply after receiving the acquired voltage. When the acquired voltage value reaches a preset percentage of the voltage output by the preset power supply, such as more than 95%, the controller controls the first switch and the second switch to be turned on through the switch control circuit, so that the output end of the startup load capacity enhancement auxiliary circuit outputs the voltage. At this time, the actual output driving capacity is equivalent to the energy storage unit and the AC‑DC power supply being connected in parallel, which is equivalent to enhancing the instantaneous current load capacity of the AC‑DC power supply, thereby achieving the effect of assisting in enhancing the startup load capacity.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of lighting drive power supply control, and in particular to a startup load capacity enhancement auxiliary circuit and power supply. Background Art

[0002] In real lighting applications, in order to save equipment costs, centralized power supply is often used to provide DC constant voltage power supply for multiple LED loads. For example, in lighting applications, a few hundred watts or even thousands of watts of AC-DC constant voltage power supply is usually used to centrally power multiple groups of lights including DC-DC constant current sources.

[0003] However, when powered on, each constant current source will have a relatively large starting current demand in a short period of time, especially when some constant current sources do not have a soft start circuit. When multiple DC-DC constant current sources are superimposed on each other, a large starting current demand is generated, which can usually reach 160% or even higher of the rated value of the power supply. As a result, a situation such as a constant voltage power supply rated at 1000W cannot drive 10 100W constant current loads occurs. Summary of the invention

[0004] The present invention provides a startup load capacity enhancement auxiliary circuit and a power supply to achieve the effect of auxiliary enhancement of the startup load capacity.

[0005] In a first aspect, an embodiment of the present invention provides a startup load capacity enhancement auxiliary circuit, the circuit comprising: a current limiting resistor, an energy storage unit, a first switch, a second switch, a switch control circuit, a voltage acquisition circuit and a controller; wherein a first end of the current limiting resistor is connected to an input end of the startup load capacity enhancement auxiliary circuit, and a second end of the current limiting resistor is connected to the energy storage unit;

[0006] The energy storage unit is connected to the output end of the startup load capacity enhancement auxiliary circuit through the first switch and the second switch in sequence, and the common connection end of the first switch and the second switch is connected to the input end of the startup load capacity enhancement auxiliary circuit;

[0007] The voltage collection end of the voltage collection circuit is connected to the voltage output end of the energy storage unit, and the voltage output end of the voltage collection circuit is connected to the sampling signal end of the controller;

[0008] The switch control circuit is connected to the control signal output terminal of the controller, the first switch and the second switch. The controller controls the on or off of the first switch and the second switch through the switch control circuit.

[0009] In a second aspect, an embodiment of the present invention further provides a power supply, which includes a starting load capacity enhancement auxiliary circuit as described in the first aspect, wherein the voltage output end of the DC voltage output module is connected to the input end of the starting load capacity enhancement auxiliary circuit, and the output end of the starting load capacity enhancement auxiliary circuit serves as the output end of the power supply.

[0010] The present invention provides a startup load capacity enhancement auxiliary circuit, which includes: a current limiting resistor, an energy storage unit, a first switch, a second switch, a switch control circuit, a voltage acquisition circuit and a controller; wherein the first end of the current limiting resistor is connected to the input end of the startup load capacity enhancement auxiliary circuit, and the second end of the current limiting resistor is connected to the energy storage unit; the energy storage unit is connected to the output end of the startup load capacity enhancement auxiliary circuit through the first switch and the second switch in sequence, and the common connection end of the first switch and the second switch is connected to the input end of the startup load capacity enhancement auxiliary circuit; the voltage acquisition end of the voltage acquisition circuit is connected to the voltage output end of the energy storage unit, and the voltage output end of the voltage acquisition circuit is connected to the sampling signal end of the controller; the switch control circuit is connected to the control signal output end of the controller, the first switch and the second switch, and the controller controls the conduction or disconnection of the first switch and the second switch through the switch control circuit. The problem that the constant voltage power supply cannot drive multiple loads when multiple loads are started is solved, and the effect of auxiliary enhancement of the startup load capacity is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural block diagram of a startup load capacity enhancement auxiliary circuit in Embodiment 1 of the present invention;

[0012] Figure 2 A schematic diagram of a startup load capacity enhancement auxiliary circuit in Embodiment 1 of the present invention;

[0013] Figure 3 is a circuit diagram of a startup load capacity enhancement auxiliary circuit in Embodiment 2 of the present invention;

[0014] Figure 4 is a circuit diagram of another startup load capacity enhancement auxiliary circuit in the second embodiment of the present invention;

[0015] Figure 5 This is a working principle diagram of a power supply in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0017] Embodiment 1

[0018] Figure 1 This is a structural block diagram of a startup load capacity enhancement auxiliary circuit provided in the first embodiment of the present invention, referring to Figure 1 , the circuit includes: a current limiting resistor 110, an energy storage unit 120, a first switch 130, a second switch 140, a switch control circuit 150, a voltage acquisition circuit 160 and a controller 170; wherein the first end of the current limiting resistor 110 is connected to the input end A1 of the startup load capacity enhancement auxiliary circuit, and the second end of the current limiting resistor 110 is connected to the energy storage unit 120;

[0019] The energy storage unit 120 is connected to the output terminal A2 of the startup load capacity enhancement auxiliary circuit through the first switch 130 and the second switch 140 in sequence, and the common connection terminal of the first switch 130 and the second switch 140 is connected to the input terminal A1 of the startup load capacity enhancement auxiliary circuit;

[0020] The voltage collection terminal of the voltage collection circuit 160 is connected to the voltage output terminal of the energy storage unit 120 , and the voltage output terminal of the voltage collection circuit 160 is connected to the sampling signal terminal B1 of the controller 170 ;

[0021] The switch control circuit 150 is connected to the control signal output terminal B2 of the controller 170 , the first switch 130 , and the second switch 140 . The controller 170 controls the on or off of the first switch 130 and the second switch 140 through the switch control circuit 150 .

[0022] In the technical solution of this embodiment, the implementation process of the startup load capacity enhancement auxiliary circuit is as follows: exemplarily, refer to Figure 1 and Figure 2 The startup load capacity enhancement auxiliary circuit is suitable for the situation where DC loads such as LEDs cannot meet the peak starting current required for load startup in some specific applications. Figure 2 The startup load capability enhancement auxiliary circuit shown is used to drive at least one constant current load. Figure 2 The input terminal A1 of the startup load capacity enhancement auxiliary circuit 20 is connected to the output terminal of the AC-DC power supply 10, and the output terminal A2 of the startup load capacity enhancement auxiliary circuit 20 is connected to multiple loads such as load 1 31, load 2 32, load 33, and load 4 34. By adding the startup load capacity enhancement auxiliary circuit, the purpose of improving the load capacity of the power supply when the loads such as load 1 31, load 2 32, load 33, and load 4 34 are started can be achieved without increasing the rated power of the power supply design. Figure 1When the auxiliary circuit for starting the load capacity enhancement is started, the first switch 130 and the second switch 140 are in the off state by default, and the voltage output by the power supply is input from the input terminal A1 of the auxiliary circuit for starting the load capacity enhancement to the current limiting resistor 110, and the energy storage unit 120 is charged with current limiting through the current limiting resistor 110. The voltage output terminal of the energy storage unit 120 is connected to the voltage collection terminal of the voltage collection circuit 160. The voltage collection terminal of the voltage collection circuit 160 collects the voltage outputted from the voltage output terminal of the energy storage unit 120 at a certain frequency and transmits the collected voltage to the sampling signal terminal B1 of the controller 170. After receiving the voltage, the controller 170 compares it with the voltage outputted by the preset power supply. When the detected voltage value reaches a preset percentage of the voltage outputted by the preset power supply, such as 95% or more of the voltage outputted by the power supply, the control signal output terminal B2 of the controller 170 outputs a control signal to the switch control circuit 150 to control the first switch 130 and the second switch 140 to be turned on. When the first switch 130 and the second switch 140 are turned on, the output terminal A2 of the start-up load capacity enhancement auxiliary circuit outputs a voltage. At this time, the actual output driving capacity is equivalent to the energy storage unit and the AC-DC power supply being connected in parallel. This is equivalent to enhancing the instantaneous current load capacity of the AC-DC power supply. By adding the startup load capacity enhancement auxiliary circuit, the startup load capacity of the AC-DC power supply can be enhanced, indirectly reducing the risk of damage to the AC-DC power supply due to large load startup current, and avoiding the need to use an AC-DC power supply with a larger power margin when designing the drive system, thereby reducing the design cost of the drive system.

[0023] The technical solution of this embodiment provides a startup load capacity enhancement auxiliary circuit, which includes: a current limiting resistor, an energy storage unit, a first switch, a second switch, a switch control circuit, a voltage acquisition circuit and a controller. When the startup load capacity enhancement auxiliary circuit is started, the first switch and the second switch are in an off state, and at this time, there is no voltage output at the output end of the startup load capacity enhancement auxiliary circuit, and the input end of the startup load capacity enhancement auxiliary circuit is connected to the current limiting resistor, and the energy storage unit is charged through the current limiting resistor. The voltage acquisition circuit acquires the voltage at the output end of the energy storage unit and sends the acquired voltage to the controller. After receiving the acquired voltage, the controller compares the acquired voltage with the voltage output by a preset power supply. When the acquired voltage value reaches a preset percentage of the voltage output by the preset power supply, such as more than 95%, the controller controls the first switch and the second switch to be turned on through the switch control circuit, so that the output end of the startup load capacity enhancement auxiliary circuit outputs a voltage, and at this time, the actual output driving capacity is equivalent to the energy storage unit and the AC-DC power supply in parallel. It is equivalent to enhancing the instantaneous current load capacity of the AC-DC power supply. It solves the problem that the constant voltage power supply cannot drive multiple loads when multiple loads are started, and achieves the effect of auxiliary enhancement of the startup load capacity.

[0024] Embodiment 2

[0025] Figure 3 is a circuit diagram of a startup load capacity enhancement auxiliary circuit provided in the second embodiment of the present invention. Based on the above technical solution, this embodiment describes the working principles of the energy storage unit, the switch control circuit, the first switch, the second switch, etc. Optionally, the first switch and the second switch can both use switch devices such as MOS tubes or relays, such as Figure 3 As shown, the first switch uses an electronic switch 330, the second switch uses an output relay 360, and the energy storage unit uses an energy storage capacitor 320. When the startup load capacity enhancement auxiliary circuit is started, the output relay 360 is in a normally open state; the energy storage capacitor 320 is first charged with a current limit through a PTC (positive temperature coefficient thermistor) thermistor 310, and then the voltage of the energy storage capacitor is sent to the analog-to-digital converter port of the single-chip microcomputer 350 through a voltage acquisition circuit 340 to measure the voltage of the energy storage capacitor 320; when it is detected that the voltage of the energy storage capacitor 320 reaches more than 95% of the preset AC-DC power supply output voltage, the electronic switch 330 such as PMOS (P-channel MOS tube) is turned on through the single-chip microcomputer 350 to make the energy storage capacitor 320 in a low-resistance output state, and the output relay 360 is turned on at the same time to start the startup load capacity enhancement auxiliary circuit output. At this time, the actual output driving capacity is equivalent to the energy storage capacitor and the AC-DC power supply in parallel. It is equivalent to enhancing the instantaneous current load capacity of the AC-DC power supply.

[0026] For example, Figure 4 is a circuit diagram of another startup load capacity enhancement auxiliary circuit provided in the second embodiment of the present invention, referring to Figure 4 The energy storage unit 120 includes at least two first capacitors 121 connected in parallel, a first end of the first capacitor 121 is connected to a second end of the current limiting resistor 110, and a second end of the first capacitor 121 is grounded.

[0027] The first capacitor 121 is used to charge through the current limiting resistor 110. It should be noted that the first capacitor is not limited to Figure 4 In the embodiment of the present invention, a plurality of first capacitors connected in parallel may be provided as required, and the specific number thereof is not specifically limited here.

[0028] Optionally, the voltage acquisition circuit 160 includes a first resistor 161, a second resistor 162, a third resistor 163 and a second capacitor 164, the first end of the first resistor 161 is connected to the energy storage unit 120, the second end of the first resistor 161 is connected to the first end of the second resistor 162, the second end of the second resistor 162 is grounded, the first end of the third resistor 163 is connected to the second end of the first resistor 161, the second end of the third resistor 163 is connected to the voltage acquisition end of the voltage acquisition circuit 160, the first end of the second capacitor 164 is connected to the voltage acquisition end of the voltage acquisition circuit 160, and the second end of the second capacitor 164 is grounded.

[0029] The first resistor 161 and the second resistor 162 are used for voltage division, and the third resistor 163 and the second capacitor 164 are used for filtering.

[0030] refer to Figure 4 , the first switch 130 adopts a MOS tube, the second switch 140 adopts a relay, the relay 140 includes a pair of normally open contacts consisting of a first contact 141 and a second contact 142; the first pole of the MOS tube 130 is connected to the energy storage unit 120, the second pole of the MOS tube 130 is connected to the first contact 141, and the second contact 142 is connected to the output terminal A2 of the startup load capacity enhancement auxiliary circuit; the first end of the coil 143 of the relay 140 and the first contact 141 are connected to the input terminal A1 of the startup load capacity enhancement auxiliary circuit;

[0031] The switch control circuit is connected to the gate of the MOS tube 130 and the second end of the coil 143 respectively.

[0032] Among them, when the auxiliary circuit for starting the load capacity enhancement is started, the relay 140 is in a normally open state by default.

[0033] Optionally, the switch control circuit 150 includes a first transistor 151, a second transistor 152, a fourth resistor 153, a fifth resistor 154 and a sixth resistor 155, the base of the first transistor 151 is connected to the control signal output terminal B2 of the controller 170, the first electrode of the first transistor 151 is grounded, the fourth resistor 153 is connected between the gate and the first electrode of the first transistor 151, the second electrode of the first transistor 151 is connected to the gate of the MOS tube 130, the fifth resistor 154 is connected between the gate and the second electrode of the MOS tube 130, the base of the second transistor 152 is connected to the control signal output terminal B1 of the controller 170, the first electrode of the second transistor 152 is grounded, the second electrode of the second transistor 152 is connected to the second input terminal of the relay coil 143, and the sixth resistor 155 is connected between the base and the first electrode of the second transistor 152.

[0034] The first transistor 151 and the second transistor 152 may be NPN transistors, which are used to turn on the MOS transistor 130 and the relay 140 when the controller 170 outputs a control signal such as a high level signal.

[0035] Optionally, the MOS tube is a PNP power MOS tube.

[0036] Among them, the MOS tube is a low-resistance output electronic switch of the energy storage unit.

[0037] Optionally, the switch control circuit also includes a seventh resistor 156, an eighth resistor 157, a ninth resistor 158, a first diode 210 and a second diode 220, the seventh resistor 156 and the eighth resistor 157 are connected in series in sequence on a line connecting the base of the first transistor 151 and the base of the second transistor 152, the first end of the ninth resistor 158 is connected to the second electrode of the first transistor 151, the second end of the ninth resistor 158 is connected to the gate of the MOS tube 130, the anode of the first diode 210 is connected to the gate of the MOS tube 130, the cathode of the first diode 210 is connected to the second electrode of the MOS tube 130, the anode of the second diode 220 is connected to the second electrode of the second transistor 152, and the cathode of the second diode 220 is connected to the first contact 141 of the relay 140.

[0038] In the technical solution of this embodiment, the implementation process of starting the load capacity enhancement auxiliary circuit is as follows: exemplarily, refer to Figure 2 and Figure 4When the auxiliary circuit for starting the load capacity enhancement is started, the MOS tube 130 is disconnected by default, the relay 140 is in the normally open state by default, and there is no voltage output at the output terminal A2 of the auxiliary circuit for starting the load capacity enhancement. The voltage output by the power supply is input to the current limiting resistor 110 from the input terminal A1 of the auxiliary circuit for starting the load capacity enhancement, and the first capacitor 121 of the energy storage unit 120 is charged with current limiting through the current limiting resistor 110. The voltage acquisition circuit 160 divides the voltage output by the energy storage unit 120 through the first resistor 161 and the second resistor 162, and then inputs the voltage to the controller 170 through the filtering effect of the third resistor 163 and the second capacitor 164 after the voltage division. After receiving the voltage output by the energy storage unit, the controller 170 compares it with the preset voltage output by the power supply. When the detection voltage value reaches a preset percentage of the preset voltage output by the power supply, such as above 95%, the controller 170 outputs a control signal to the switch control circuit 150, and the control signal turns on the first transistor 151 and the second transistor 152, and the first After the transistor 151 is turned on, its second electrode outputs a low voltage to pull down the gate voltage of the MOS tube to turn on the MOS tube. After the MOS tube is turned on, the voltage input by the energy storage unit is output; after the second transistor 152 is turned on, the relay coil 143 is energized. After the relay coil 143 is energized, the first contact 141 and the second contact 142 are closed, so that the voltage output by the energy storage unit 120 and the voltage input by the power supply through the input terminal A1 of the starting load capacity enhancement auxiliary circuit are output through the output terminal A2 of the starting load capacity enhancement auxiliary circuit, which is used to provide the large current required for starting to the load that needs to be started.

[0039] Optionally, a tenth resistor 230 and a third capacitor 240 are included. The tenth resistor 230 and the third capacitor 240 are connected in series and then connected in parallel between the first contact 141 and the second contact 142 of the relay 140 .

[0040] Optionally, the current limiting resistor 110 is a positive temperature coefficient PTC thermistor.

[0041] Among them, the energy storage unit in the circuit is charged with current limiting through PTC (positive temperature coefficient thermistor), which will not cause other adverse effects on the original driving power supply.

[0042] The startup load capacity enhancement auxiliary circuit of the technical solution of this embodiment, when the startup load capacity enhancement auxiliary circuit is started, the first switch and the second switch are in the off state, at this time, there is no voltage output at the output end of the startup load capacity enhancement auxiliary circuit, the input end of the startup load capacity enhancement auxiliary circuit is connected to the current limiting resistor, the energy storage unit is charged through the current limiting resistor, the voltage acquisition circuit acquires the voltage at the output end of the energy storage unit and sends the acquired voltage to the controller, the controller compares the acquired voltage with the preset power output voltage after receiving the acquired voltage, when the acquired voltage value reaches a preset percentage of the preset power output voltage, such as more than 95%, the controller controls the first switch and the second switch to conduct through the switch control circuit, so that the output end of the startup load capacity enhancement auxiliary circuit outputs the voltage, at this time, the actual output driving capacity is equivalent to the energy storage unit and the AC-DC power supply in parallel, which is equivalent to enhancing the instantaneous current load capacity of the AC-DC power supply. The problem that a constant voltage power supply cannot drive multiple loads when multiple loads are started is solved, and the following advantages can be achieved: the circuit principle is simple and flexible, and different starting load capacities can be provided for the product by changing the capacitance of the first capacitor of the energy storage unit; the energy storage unit in the circuit is charged by current limiting through a PTC thermistor, and no other adverse effects are caused on the original drive power supply; it can be conveniently made into an independent product and installed at the output end of other DC loads such as LEDs, so as to enhance the starting load capacity of an LED drive power supply with weak starting load capacity; a controller (such as a single-chip microcomputer) is used in the circuit, and the output start-up voltage can be flexibly set through software programming.

[0043] Embodiment 3

[0044] An embodiment of the present invention provides a power supply, referring to Figure 5 The power supply 1 includes a DC voltage output module 410 and a starting load capacity enhancement auxiliary circuit 420 as described in any embodiment of the present invention. The voltage output end of the DC voltage output module 410 is connected to the input end A1 of the starting load capacity enhancement auxiliary circuit 420, and the output end A2 of the starting load capacity enhancement auxiliary circuit 420 serves as the output end of the power supply.

[0045] The power source may be an AC-DC constant voltage power source, a DC constant voltage power source, a lithium battery, etc. When in use, the output end of the power source, i.e., the output end A2 of the startup load capacity enhancement auxiliary circuit 420, is connected to the load to be connected, and can provide the large current required for the load startup, thereby avoiding the situation where the constant voltage source cannot provide the startup voltage for the large load.

[0046] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A startup load capacity enhancement auxiliary circuit, characterized in that: include: A current limiting resistor, an energy storage unit, a first switch, a second switch, a switch control circuit, a voltage acquisition circuit and a controller; wherein the first end of the current limiting resistor is connected to the input end of the startup load capacity enhancement auxiliary circuit, and the second end of the current limiting resistor is connected to the energy storage unit; The energy storage unit is connected to the output end of the startup load capacity enhancement auxiliary circuit through the first switch and the second switch in sequence, and the common connection end of the first switch and the second switch is connected to the input end of the startup load capacity enhancement auxiliary circuit; The voltage collection terminal of the voltage collection circuit is connected to the voltage output terminal of the energy storage unit, and the voltage output terminal of the voltage collection circuit is connected to the sampling signal terminal of the controller; The switch control circuit is connected to the control signal output terminal of the controller, the first switch and the second switch, and the controller controls the on or off of the first switch and the second switch through the switch control circuit.

2. The startup load capacity enhancement auxiliary circuit according to claim 1, characterized in that: The energy storage unit includes at least two first capacitors connected in parallel, a first end of the first capacitor is connected to a second end of the current limiting resistor, and a second end of the first capacitor is grounded.

3. The startup load capacity enhancement auxiliary circuit according to claim 1, characterized in that: The voltage acquisition circuit includes a first resistor, a second resistor, a third resistor and a second capacitor, the first end of the first resistor is connected to the energy storage unit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, the first end of the third resistor is connected to the second end of the first resistor, the second end of the third resistor is connected to the voltage acquisition end of the voltage acquisition circuit, the first end of the second capacitor is connected to the voltage acquisition end of the voltage acquisition circuit, and the second end of the second capacitor is grounded.

4. The startup load capacity enhancement auxiliary circuit according to claim 1, characterized in that: The first switch adopts a MOS tube, and the second switch adopts a relay, and the relay includes a pair of normally open contacts consisting of a first contact and a second contact; the first pole of the MOS tube is connected to the energy storage unit, the second pole of the MOS tube is connected to the first contact, and the second contact is connected to the output end of the startup load capacity enhancement auxiliary circuit; the first end of the coil of the relay and the first contact are connected to the input end of the startup load capacity enhancement auxiliary circuit; The switch control circuit is connected to the gate of the MOS tube and the second end of the coil respectively.

5. The startup load capacity enhancement auxiliary circuit according to claim 4, characterized in that: The switch control circuit includes a first transistor, a second transistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein the base of the first transistor is connected to the control signal output end of the controller, the first electrode of the first transistor is grounded, the fourth resistor is connected between the gate and the first electrode of the first transistor, the second electrode of the first transistor is connected to the gate of the MOS tube, the fifth resistor is connected between the gate and the second electrode of the MOS tube, the base of the second transistor is connected to the control signal output end of the controller, the first electrode of the second transistor is grounded, the second electrode of the second transistor is connected to the second input end of the relay coil, and the sixth resistor is connected between the base and the first electrode of the second transistor.

6. The startup load capacity enhancement auxiliary circuit according to claim 4, characterized in that: The MOS tube is a PNP type power MOS tube.

7. The startup load capacity enhancement auxiliary circuit according to claim 5, characterized in that: The switch control circuit also includes a seventh resistor, an eighth resistor, a ninth resistor, a first diode and a second diode. The seventh resistor and the eighth resistor are connected in series in sequence on a line connecting the base of the first transistor and the base of the second transistor. The first end of the ninth resistor is connected to the second electrode of the first transistor, the second end of the ninth resistor is connected to the gate of the MOS transistor, the anode of the first diode is connected to the gate of the MOS transistor, the cathode of the first diode is connected to the second electrode of the MOS transistor, the anode of the second diode is connected to the second electrode of the second transistor, and the cathode of the second diode is connected to the first contact of the relay.

8. The startup load capacity enhancement auxiliary circuit according to claim 4, characterized in that: It includes a tenth resistor and a third capacitor, which are connected in series and then in parallel between the first contact and the second contact of the relay.

9. The startup load capacity enhancement auxiliary circuit according to claim 1, characterized in that: The current limiting resistor is a positive temperature coefficient PTC thermistor.

10. A power supply, characterized in that: It comprises a DC voltage output module and the starting load capacity enhancement auxiliary circuit as described in any one of claims 1 to 9, wherein the voltage output end of the DC voltage output module is connected to the input end of the starting load capacity enhancement auxiliary circuit, and the output end of the starting load capacity enhancement auxiliary circuit serves as the output end of the power supply.

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