Power supply acceleration starting circuit and power supply circuit

Abstract

The utility model relates to the technical field of vehicle-mounted power supplies, and discloses a power supply acceleration starting circuit and a power supply circuit, the power supply acceleration starting circuit comprises a switch circuit, a switch control circuit and an auxiliary circuit, after the switch circuit is conducted, the switch circuit is used for rapidly establishing power supply voltage of equipment to be powered; in the initial stage of the power supply output voltage, the switch control circuit is used for controlling the conduction time of the switch circuit; the first end of the auxiliary circuit is connected with the output end of the power supply; the second end of the auxiliary circuit is connected with to-be-powered equipment; and after the switching circuit is switched off, the power supply supplies power to the to-be-powered equipment through the auxiliary circuit. According to the utility model, the switch control circuit controls the conduction time of the switch circuit, the conduction time is the starting time of the power supply, so that the starting time of the power supply is accelerated, the loss is reduced, and the conduction time is controllable, so that the circuit is suitable for power supplies of different models.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of vehicle-mounted power supply, and particularly relates to a power supply acceleration starting circuit and power supply circuit. BACKGROUND

[0002] At present, the power supply inside the inverter of a new energy vehicle is usually obtained from two ways, the first of which is derived from a low-voltage battery of the vehicle, and the other is derived from a high-voltage battery. Usually, the two power supplies can be mutually supplied with power to the low-voltage side and the high-voltage side through electromagnetic isolation to ensure reliable operation of the inverter. Usually, the high-voltage power supply also serves as a backup power supply to supply power to low-voltage components such as MCUs, logic judgment circuits, and communication circuits.

[0003] At present, a wide range of step-down DCDC power supplies are used to convert high-voltage power into low-voltage power on the high-voltage side, as shown in the figure. Such power supplies usually have a set of auxiliary windings to supply power to the power supply chip to meet the continuous operation of the high-voltage power supply. Figure 1

[0004] According to the requirements of related vehicle safety and the response processing capabilities of many OEMs to emergencies, the response capabilities of the inverter to safety must be further improved. The high-voltage power supply must be able to start and provide power to the safety execution unit and the control unit inside the inverter within us level time when the low-voltage power of the vehicle is cut off, so that the vehicle can enter a safe state. The current commonly used starting method usually takes hundreds of milliseconds, which cannot meet the requirement of fast starting, CONTENT OF THE UTILITY MODEL

[0005] Therefore, the utility model provides a power supply acceleration starting circuit and power supply circuit to solve the problem of how to accelerate the starting of the power supply.

[0006] In the first aspect, the utility model provides a power supply acceleration starting circuit, including: switching circuit, switch control circuit and auxiliary circuit, wherein, the first end of switching circuit is connected with the output end of power supply, the second end of switching circuit is grounded, the third end of switching circuit is connected with the device to be powered, after switching circuit is turned on, switching circuit is used for quickly establishing the power supply voltage of the device to be powered, the first end of switch control circuit is connected with the output end of power supply, the second end of switch control circuit is grounded, the third end of switch control circuit is connected with the control end of switching circuit, in the initial stage of power supply output voltage, switch control circuit is used for controlling the on time of switching circuit, the first end of auxiliary circuit is connected with the output end of power supply, the second end of auxiliary circuit is connected with the device to be powered, after switching circuit is turned off, power supply supplies power to the device to be powered through auxiliary circuit.

[0007] ​The utility model discloses, switch control circuit controls the switch circuit's conduction time, and this conduction time is power start -up time, thereby in accelerating power start -up time, and reduce the loss, and because the conduction time is controllable, can be applicable to the power of different models.

[0008] In an alternative embodiment, the switch circuit comprises: a first current limiting circuit, a power switch tube, a first capacitor and a second capacitor, wherein the first end of the first current limiting circuit is connected with the output end of the power supply, and the second end of the first current limiting circuit is connected with the first end of the power switch tube; the second end of the power switch tube is connected with the first end of the first capacitor, the second end of the second capacitor and the to-be-powered device, and the control end of the power switch tube is connected with the third end of the switch circuit; the second end of the first capacitor and the second end of the second capacitor are both grounded.

[0009] In an alternative embodiment, the first current limiting circuit comprises: at least one first resistor.

[0010] In an alternative embodiment, the switch control circuit comprises: a second current limiting circuit, a voltage stabilizing power supply and a voltage dividing circuit, wherein the first end of the second current limiting circuit is connected with the output end of the power supply, the second end of the second current limiting circuit is connected with the output end of the voltage stabilizing power supply and the first end of the voltage dividing circuit; the second end of the voltage dividing circuit is connected with the control end of the voltage stabilizing power supply, and the second end of the voltage dividing circuit is connected with the input end of the voltage stabilizing power supply and then grounded.

[0011] In an alternative embodiment, the second current limiting circuit comprises: at least one second resistor.

[0012] In an alternative embodiment, the voltage dividing circuit comprises: a third resistor, a fourth resistor, a fifth resistor and a third capacitor, wherein the first end of the third resistor is connected with the second end of the second current limiting circuit and the output end of the voltage stabilizing power supply, the second end of the third resistor is connected with the first end of the fourth resistor and the control end of the voltage stabilizing power supply; the second end of the fourth resistor is connected with the first end of the fifth resistor and the first end of the third capacitor; the second end of the fifth resistor and the second end of the third capacitor are connected with the second end of the voltage stabilizing power supply and then grounded.

[0013] In an alternative embodiment, the auxiliary circuit comprises: a first winding, a second winding and a controllable switch, and the first winding and the second winding constitute a transformer, wherein the opposite name end of the first winding is connected with the output end of the power supply, and the same name end of the first winding is connected with the first end of the controllable switch; the same name end of the second winding is connected with the to-be-powered device, and the opposite name end of the second winding is grounded; the second end of the controllable switch is grounded.

[0014] In an alternative embodiment, the power supply acceleration starting circuit further comprises a decoupling circuit, wherein a first end of the decoupling circuit is connected to the second end of the auxiliary circuit, a second end of the decoupling circuit is connected to the third end of the switching circuit, and a third end of the decoupling circuit is connected to the device to be powered; the decoupling circuit is used to prevent the output voltage of the auxiliary circuit from being applied to the switching circuit, and to prevent the output voltage of the switching circuit from being applied to the auxiliary circuit.

[0015] In an alternative embodiment, the decoupling circuit comprises a first diode and a second diode, wherein an anode of the first diode is connected to the third end of the switching circuit, and a cathode of the first diode is connected to the device to be powered; an anode of the second diode is connected to the second end of the auxiliary circuit, and a cathode of the second diode is connected to the device to be powered.

[0016] In a second aspect, the utility model provides a power supply circuit, comprising: the power supply acceleration starting circuit, high voltage power supply, low voltage power supply and voltage conversion circuit of first aspect and any alternative embodiment thereof, wherein the output end of high voltage power supply is connected with the first end of switching circuit and the first end of auxiliary circuit; low voltage power supply is connected with voltage conversion circuit; when low voltage power supply is powered off, the power supply acceleration starting circuit is used to accelerate high voltage power supply starting to power voltage conversion circuit. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0018] Figure 1 It is the structural schematic diagram of the power supply circuit of related art;

[0019] Figure 2 It is the component diagram of the power supply acceleration starting circuit according to the embodiment of the utility model;

[0020] Figure 3 It is the component diagram of another power supply acceleration starting circuit according to the embodiment of the utility model;

[0021] Figure 4 It is the component diagram of another power supply acceleration starting circuit according to the embodiment of the utility model;

[0022] Figure 5 It is the specific circuit structure diagram of the power supply acceleration starting circuit according to the embodiment of the utility model;

[0023] Figure 6is another power supply acceleration starting circuit according to the embodiment of the utility model.

[0024] Reference signs:

[0025] 1-switching circuit;2-switching control circuit;3-assistant circuit;4-decoupling circuit;

[0026] 11-first current limiting circuit;21-second current limiting circuit;22-stabilized power supply;23-voltage dividing circuit;

[0027] Q1-power switch tube;Q2-controllable switch;

[0028] C1-first capacitor;C2-second capacitor;C3-third capacitor;

[0029] R1-first resistance;R2-second resistance;R3-third resistance;R4-fourth resistance;R5-fifth resistance;

[0030] L1-first winding;L2-second winding;

[0031] D1-first diode;D2-second diode. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantage of the embodiment of the utility model more clear, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0033] In the description of the utility model, it needs to be explained that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through intermediate medium, can also be the communication inside two elements, can be wireless connection, can also be wired connection. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0036] In the embodiment, a power supply acceleration starting circuit is provided, as shown in the drawing, comprising: a switch circuit 1, a switch control circuit 2 and an auxiliary circuit 3. Figure 2

[0037] As shown in the drawing, the first end of the switch circuit 1 is connected with the output end of the power supply, the second end of the switch circuit 1 is grounded, and the third end of the switch circuit 1 is connected with the device to be powered. Figure 2

[0038] As shown in the drawing, the first end of the switch control circuit 2 is connected with the output end of the power supply, the second end of the switch control circuit 2 is grounded, and the third end of the switch circuit 1 is connected with the control end of the switch circuit 1; in the initial stage of the output voltage of the power supply, the switch control circuit 2 is used for controlling the conduction time of the switch circuit 1. Figure 2

[0039] As shown in the drawing, the first end of the auxiliary circuit 3 is connected with the output end of the power supply, and the second end of the auxiliary circuit 3 is connected with the device to be powered; after the switch circuit 1 is turned off, the power supply supplies power to the device to be powered through the auxiliary circuit 3. Figure 2

[0040] Specifically, the acceleration power supply starting process is divided into the following steps:

[0041] (1) before the power supply outputs voltage, the switch circuit 1 is in the off state.

[0042] (2) in the initial stage of the output voltage of the power supply, the output voltage of the auxiliary circuit 3 is insufficient to supply power to the device to be powered, the power supply charges the internal devices of the switch control circuit 2, and the switch circuit 1 is turned on when the output voltage of the switch control circuit 2 is sufficient to make the switch circuit 1 conduct.

[0043] (3) after the switch circuit 1 is turned on, the power supply charges the internal devices of the switch circuit 1, so that the voltage is quickly established to supply power to the device to be powered.

[0044] (4) by controlling the parameters of the internal devices of the switch control circuit 2, the conduction time of the switch circuit 1 is controlled, and after the conduction time, the switch circuit 1 is turned off, and at this time the power supply directly supplies power to the device to be powered through the auxiliary circuit 3.

[0045] Optionally, the device to be powered can be a DC-DC circuit, and the DC-DC voltage can convert the output voltage of the power supply into a voltage of a corresponding voltage level to supply power to the subsequent device.

[0046] ​​​​In some optional embodiments, as shown in Figure 3 The switch circuit 1 comprises a first current limiting circuit 11, a power switch tube Q1, a first capacitor C1 and a second capacitor C2.

[0047] As shown in Figure 3 The first end of the first current limiting circuit 11 is connected with the output end of the power supply, and the second end of the first current limiting circuit 11 is connected with the first end of the power switch tube Q1; the second end of the power switch tube Q1 is connected with the first end of the first capacitor C1, the second end of the second capacitor C2 and the device to be powered, and the control end of the power switch tube Q1 is connected with the third end of the switch circuit 1; the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded.

[0048] Specifically, when the output voltage of the switch control circuit 2 reaches the turn-on voltage of the power switch tube Q1, the power switch tube Q1 is turned on, and then the power supply charges the first capacitor C1 and the second capacitor C2 through the first current limiting circuit 11 and the power switch tube Q1 in turn, and the first current limiting circuit 11 can limit the size of the charging current. Due to the turn-on of the power switch tube Q1, the input voltage level of the device to be powered is quickly established to ensure rapid start-up.

[0049] Specifically, by setting the internal component parameters of the switch control circuit 2 to set the turn-on time of the switch circuit 1, after the turn-on time, the power switch tube Q1 is turned off, and the power supply directly supplies power to the device to be powered through the auxiliary circuit 3.

[0050] Optionally, the first current limiting circuit 11 comprises at least one first resistor R1. Specifically, the number of first resistors R1 can be set to limit the current size according to the actual power supply situation, and when the first current limiting circuit 11 comprises a plurality of first resistors R1, the plurality of first resistors R1 are connected in series, or in parallel, or in series-parallel, without limitation.

[0051] Optionally, Figure 3 The power switch tube Q1 is a field effect transistor, i.e. a MOS tube, but can also be other transistors, without limitation.

[0052] In some optional embodiments, as shown in Figure 4 The switch control circuit 2 comprises a second current limiting circuit 21, a voltage stabilizing power supply 22 and a voltage dividing circuit 23.

[0053] As shown in Figure 4 The first end of the second current limiting circuit 21 is connected with the output end of the power supply, the second end of the second current limiting circuit 21 is connected with the output end of the voltage stabilizing power supply 22 and the first end of the voltage dividing circuit 23; the second end of the voltage dividing circuit 23 is connected with the control end of the voltage stabilizing power supply 22, and the second end of the voltage dividing circuit 23 is connected with the input end of the voltage stabilizing power supply 22 and then grounded.

[0054] Specifically, in the initial stage of the power supply output voltage, the switch circuit 1 is off, the power supply output current flows to the voltage stabilizer 22, and the voltage stabilizer output reference voltage is output to the control end of the switch circuit 1, i.e. the control end of the power switch Q1, and the power switch Q1 is transiently turned on.

[0055] Specifically, by setting the internal component parameters of the voltage dividing circuit 23 and the output reference voltage of the voltage stabilizer 22, the on time of the switch circuit 1 can be limited.

[0056] Optionally, the second current limiting circuit 21 comprises at least one second resistor R2. Specifically, the number of second resistors R2 can be set to limit the current size according to the actual power supply situation, and the plurality of second resistors R2 are connected in series, or in parallel, or in series-parallel, without limitation.

[0057] In some optional embodiments, as shown in Figure 5 The voltage dividing circuit 23 comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a third capacitor C3, wherein, Figure 5 In the above description, the first current limiting circuit 11 takes one first resistor R1 as an example, and the second current limiting circuit 21 takes one second resistor R2 as an example, but it is only for example and is not limited thereto.

[0058] As shown in Figure 5 The first end of the third resistor R3 is connected with the second end of the second current limiting circuit 21 (i.e. the second resistor R2) and the output end of the voltage stabilizer 22 (i.e. TL431), the second end of the third resistor R3 is connected with the first end of the fourth resistor R4 and the control end of the voltage stabilizer 22; the second end of the fourth resistor R4 is connected with the first end of the fifth resistor R5 and the first end of the third capacitor C3; the second end of the fifth resistor R5 and the second end of the third capacitor C3 are connected with the second end of the voltage stabilizer 22 and then grounded.

[0059] In some optional embodiments, as shown in Figure 5 The auxiliary circuit 3 comprises a first winding L1, a second winding L2 and a controllable switch Q2, and the first winding L1 and the second winding L2 constitute a transformer, wherein the opposite end of the first winding L1 is connected with the output end of the power supply, the same end of the first winding L1 is connected with the first end of the controllable switch Q2; the same end of the second winding L2 is connected with the to-be-powered device, and the opposite end of the second winding L2 is grounded; the second end of the controllable switch Q2 is grounded.

[0060] Specifically, Figure 5When the power supply output voltage, HV BUS passes through the first resistor R1 to the drain of the power switch tube Q1, at this time the power switch tube Q1 is off, HV BUS passes through the second resistor R2 to the cathode of TL431, wherein the second resistor R2 is used to set the output current capacity of TL431.

[0061] Specifically, Figure 5 When the power supply is powered on, during the HV BUS power transient process, the current of HV BUS passes through the second resistor R2 to TL431, and the current of HV BUS passes through the third resistor R3 and the fourth resistor R4 to start TL431, so that TL431 outputs a reference voltage V ref At this time, the voltage transient passes through the fourth resistor R4 and the third capacitor C3 to form a current I ref , which satisfies the following relationship:

[0062] I ref =V ref / R4 (1)

[0063] At the same time, the cathode output end of TL341 generates a voltage to the gate of the power switch tube Q1, and the power switch tube Q1 is transiently turned on. HV BUS passes through the second resistor R2 to the power switch tube Q1 to supply power to the device to be powered, that is, to supply power to the Power IC. HVBUS passes through the auxiliary circuit 3 and outputs to the Power IC to supply power to the Power IC. When the source voltage of the power switch tube Q1 is equal to the output voltage V AUX of the output circuit, the current I(TL431) flowing through the third resistor R3 and the fourth resistor R4 satisfies the following relationship:

[0064] I(TL431)=(V REF -V AUX ) / (R3+R4) (2)

[0065] The above I(TL431) = I ref , then the third resistor R3 and the fourth resistor R4 satisfy the following relationship:

[0066]

[0067] In the formula, V REF is the reference voltage source inside TL431; V AUX is the output voltage value of the auxiliary circuit 3.

[0068] When the power switch tube Q1 is turned on, HV BUS charges the first capacitor C1 and the second capacitor C2 through the first resistor R1. The first resistor R1 limits the charging current. Since the power switch tube Q1 is turned on, the input voltage VCC of the Power IC is quickly raised, thereby ensuring fast startup.

[0069] After the HV BUS transient output, the reference voltage V REF will be charged through the fourth resistor R4 to the charging circuit composed of the fifth resistor R5 and the third capacitor C3, and the charging time is T start_up , as follows:

[0070] T start_up = 1 / 2 * R5 * C3 (4)

[0071] When the third capacitor C3 is charged more than half, the cathode output terminal of the TL431 generates a voltage which will pass through the third resistor R3, the fourth resistor R4 and the fifth resistor R5, and at this time there is the following relationship:

[0072] I ref ' = V REF / (R4+R5) (5)

[0073] I(TL431)' = V AUX / (R3+R4+R5) (6)

[0074] The above I(TL431)' = I ref ' can be obtained:

[0075]

[0076] In the formula, V REF is the reference voltage source inside the TL431; V AUX is the output voltage value of the auxiliary circuit 3, T start_up is the conduction time of the power switch tube Q1.

[0077] After T start_up , the power switch tube Q1 is turned off, and the input voltage VCC level of the Power IC is continuously provided by the auxiliary circuit 3 (i.e. the second winding L2), and by setting the time Tstart_up, the increase of loss caused by excessive conduction of the power switch tube Q1 can be avoided.

[0078] In some optional embodiments, as Figure 6 shown, the power supply acceleration starting circuit further comprises: a decoupling circuit 4, wherein the first end of the decoupling circuit 4 is connected with the second end of the auxiliary circuit 3, the second end of the decoupling circuit 4 is connected with the third end of the switching circuit 1, and the third end of the decoupling circuit 4 is connected with the to-be-powered device; the decoupling circuit 4 is used for preventing the output voltage of the auxiliary circuit 3 from being applied to the switching circuit 1, and preventing the output voltage of the switching circuit 1 from being applied to the auxiliary circuit 3.

[0079] Optionally, as Figure 5As shown, the decoupling circuit 4 comprises a first diode D1 and a second diode D2, wherein the anode of the first diode D1 is connected with the third end of the switching circuit 1, and the cathode of the first diode D1 is connected with the device to be powered; the anode of the second diode D2 is connected with the second end of the auxiliary circuit 3, and the cathode of the second diode D2 is connected with the device to be powered.

[0080] Specifically, Figure 5 In the embodiment, the first diode D1 can block the influence of the second winding L2 on the power switch tube Q1, and the second diode D2 can block the influence of the power switch tube Q1 on the second winding L2, that is, only one voltage is used to supply power to the device to be powered during the entire power supply process, so as to achieve the purpose of decoupling.

[0081] In the embodiment, a power supply circuit is provided, comprising the power supply acceleration starting circuit, the high-voltage power supply, the low-voltage power supply and the voltage conversion circuit in the above embodiment and any optional implementation manner thereof, wherein the output end of the high-voltage power supply is connected with the first end of the switching circuit 1 and the first end of the auxiliary circuit 3; the low-voltage power supply is connected with the voltage conversion circuit.

[0082] Specifically, when the low-voltage power supply is powered off, the power supply acceleration starting circuit is used to accelerate the starting of the high-voltage power supply to supply power to the voltage conversion circuit. The acceleration starting process has been described in detail in the above embodiment, and will not be described here.

[0083] Specifically, the device to be powered can be a DC-DC circuit, which converts the high-voltage power supply into a power supply voltage for the safety execution unit and the control unit in the inverter, so that the embodiment can start and provide the power supply for the safety execution unit and the control unit in the inverter within a time of us, so as to make the vehicle enter a safe state; the starting time is controllable, the loss is reduced, and the circuit can be reused in different models under different bus voltages by slightly adjusting the parameter values; the circuit is built by using discrete devices, and the cost is low.

[0084] Although the embodiments of the utility model have been described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A power supply start-up acceleration circuit, characterized by comprising: The application relates to a power supply device, which comprises a switch circuit, a switch control circuit and an auxiliary circuit, wherein the first end of the switch circuit is connected with the output end of the power supply, the second end of the switch circuit is grounded, and the third end of the switch circuit is connected with a device to be powered; after the switch circuit is turned on, the switch circuit is used for quickly establishing the power supply voltage of the device to be powered. The first end of the switch control circuit is connected with the output end of the power supply, the second end of the switch control circuit is grounded, and the third end of the switch circuit is connected with the control end of the switch circuit; in the initial stage of the output voltage of the power supply, the switch control circuit is used for controlling the on time of the switch circuit. The first end of the auxiliary circuit is connected with the output end of the power supply, and the second end of the auxiliary circuit is connected with the device to be powered; after the switch circuit is turned off, the power supply supplies power to the device to be powered through the auxiliary circuit. The switch circuit comprises a first current limiting circuit, a power switch tube, a first capacitor and a second capacitor, wherein the first end of the first current limiting circuit is connected with the output end of the power supply, and the second end of the first current limiting circuit is connected with the first end of the power switch tube. The second end of the power switch tube is connected with the first end of the first capacitor, the second end of the second capacitor and the device to be powered, and the control end of the power switch tube is connected with the third end of the switch circuit.

2. The power supply start-up acceleration circuit according to claim 1, wherein The second end of the first capacitor and the second end of the second capacitor are grounded. The first current limiting circuit comprises at least one first resistor. The switch control circuit comprises a second current limiting circuit, a voltage stabilizing power supply and a voltage dividing circuit, wherein the first end of the second current limiting circuit is connected with the output end of the power supply, the second end of the second current limiting circuit is connected with the output end of the voltage stabilizing power supply and the first end of the voltage dividing circuit. The second end of the voltage dividing circuit is connected with the control end of the voltage stabilizing power supply, and the second end of the voltage dividing circuit is connected with the input end of the voltage stabilizing power supply and grounded.

3. The power supply start-up acceleration circuit of claim 2, wherein The second current limiting circuit comprises at least one second resistor.

4. The power supply start-up acceleration circuit of claim 1, wherein The voltage dividing circuit comprises a third resistor, a fourth resistor, a fifth resistor and a third capacitor, wherein the first end of the third resistor is connected with the second end of the second current limiting circuit and the output end of the voltage stabilizing power supply, and the second end of the third resistor is connected with the first end of the fourth resistor and the control end of the voltage stabilizing power supply. The second end of the fourth resistor is connected with the first end of the fifth resistor and the first end of the third capacitor. The second end of the fifth resistor and the second end of the third capacitor are connected with the second end of the voltage stabilizing power supply and grounded.

5. The power supply start-up acceleration circuit of claim 4, wherein, The auxiliary circuit comprises a first winding, a second winding and a controllable switch, wherein the first winding and the second winding constitute a transformer.

6. The power supply start-up acceleration circuit of claim 4, wherein, The opposite end of the first winding is connected with the output end of the power supply, and the same end of the first winding is connected with the first end of the controllable switch. The same end of the second winding is connected with the device to be powered, and the opposite end of the second winding is grounded. The second end of the controllable switch is grounded. The application further relates to a decoupling circuit, wherein the first end of the decoupling circuit is connected with the output end of the power supply, the second end of the decoupling circuit is connected with the device to be powered, and the third end of the decoupling circuit is connected with the second end of the auxiliary circuit.

7. The power supply start-up acceleration circuit of claim 1, wherein ​ ​ ​ ​ 8. The power supply start-up acceleration circuit of claim 1, wherein, ​ ​ The first end of the decoupling circuit is connected with the second end of the auxiliary circuit, the second end of the decoupling circuit is connected with the third end of the switching circuit, and the third end of the decoupling circuit is connected with the device to be powered; the decoupling circuit is used to prevent the auxiliary circuit output voltage from being applied to the switching circuit, and to prevent the output voltage of the switching circuit from being applied to the auxiliary circuit.

9. The power supply start-up acceleration circuit of claim 8, wherein, The decoupling circuit comprises a first diode and a second diode, wherein, The anode of the first diode is connected with the third end of the switching circuit, and the cathode of the first diode is connected with the device to be powered; The anode of the second diode is connected with the second end of the auxiliary circuit, and the cathode of the second diode is connected with the device to be powered.

10. A power supply circuit, characterized by comprising: The power supply acceleration starting circuit, the high-voltage power supply, the low-voltage power supply and the voltage conversion circuit according to any one of claims 1-9, wherein, The output end of the high-voltage power supply is connected with the first end of the switching circuit and the first end of the auxiliary circuit; The low-voltage power supply is connected with the voltage conversion circuit; When the low-voltage power supply is powered off, the power supply acceleration starting circuit is used to accelerate the starting of the high-voltage power supply to supply power to the voltage conversion circuit. ​

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