Multiple output DC power system

Abstract

This invention provides a multi-output DC power system, comprising: an input terminal of a switch detection circuit connected to 220V DC power; an output terminal of a switch control circuit connected to the load and the input terminal of a multi-output voltage regulator module; an input terminal of a battery management circuit connected to the output terminal of the switch control circuit; an output terminal of the battery management circuit connected to the positive terminal of a battery; the positive terminal of the battery connected to the input terminal of a detection switching circuit; an output terminal of the detection switching circuit connected to the input terminal of a boost circuit; an output terminal of the boost circuit energizing the load and the input terminal of the multi-output voltage regulator module; and a detection input terminal of the detection switching circuit connected to the output terminal of the switch control circuit. This system can provide DC power of various voltage levels to DC loads in a power system without requiring an additional DC power supply. Furthermore, it can perform overvoltage, undervoltage, and power outage detection during power supply.

Description

Technical Field

[0001] The present invention relates to a direct current system, and in particular to a multi-output power direct current system. Background Art

[0002] In the power system, a DC system is required for power supply, such as DC panels and various monitoring equipment. In the prior art, although there are various DC systems, the existing DC systems have poor stability during operation. If the stability of the DC system is improved, the control of the entire DC system will be complicated, resulting in high costs.

[0003] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a multi-output DC power system, which can provide DC power of multiple different voltage levels to DC loads in the power system without the need for an additional DC power supply. Moreover, during the power supply process, the DC can be over-voltage, under-voltage and power-off detected, and the DC system can be almost uninterrupted in power supply. The entire system has high stability and simple structure.

[0005] A multi-output DC power system provided by the present invention comprises a switch control circuit, a multi-channel output voltage stabilizing module, a storage battery, a battery management circuit, a boost circuit and a detection switching circuit;

[0006] The input terminal of the switch detection circuit is connected to 220V DC, the output terminal of the switch control circuit is connected to the input terminal of the load and the multi-channel output voltage stabilizing module, the input terminal of the battery management circuit is connected to the output terminal of the switch control circuit, the output terminal of the battery management circuit is connected to the positive electrode of the battery, the positive electrode of the battery is connected to the input terminal of the detection switching circuit, the output terminal of the detection switching circuit is connected to the input terminal of the boost circuit, the output terminal of the boost circuit is energized to the input terminal of the load and the multi-channel output voltage stabilizing module, and the detection input terminal of the detection switching circuit is connected to the output terminal of the switch control circuit.

[0007] Further, the multi-channel output voltage stabilizing module includes a first voltage stabilizing module DC-DCⅠ, a second voltage stabilizing module DC-DCⅡ, a third voltage stabilizing module DC-DCⅢ, a fourth voltage stabilizing module DC-DCⅣ, a resistor R5, a diode D2, a resistor R5, a resistor R6 and a capacitor C2;

[0008] One end of the resistor R5 is connected to the output end of the switch control circuit as the input end of the multi-channel output voltage regulator module, the other end of the resistor R5 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is grounded through the capacitor C2, the negative electrode of the diode D2 is connected to the input end of the first voltage regulator module DC-DCⅠ through the resistor R6, and the output end of the first voltage regulator module DC-DCⅠ outputs 48V DC;

[0009] The input end of the second voltage stabilizing module DC-DCⅡ is connected to the output end of the first voltage stabilizing module DC-DCⅠ, and the second voltage stabilizing module DC-DCⅡ outputs 24V direct current;

[0010] The input end of the third voltage stabilizing module DC-DCⅢ is connected to the output end of the second voltage stabilizing module DC-DCⅡ, and the third voltage stabilizing module DC-DCⅢ outputs 12V direct current;

[0011] The input end of the fourth voltage stabilizing module DC-DCⅣ is connected to the output end of the third voltage stabilizing module DC-DCⅢ, and the fourth voltage stabilizing module DC-DCⅣ outputs 5V direct current.

[0012] Further, the switch control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a voltage regulator DW1, a voltage regulator DW2, a capacitor C1, a PMOS transistor Q1, a transistor Q2 and a silicon chain D1;

[0013] The source of the PMOS tube Q1 is used as the input end of the switch control circuit, the drain of the PMOS tube Q1 is connected to the positive electrode of the silicon chain D1, and the negative electrode of the silicon chain D1 is used as the output end of the switch control circuit;

[0014] The source of the PMOS tube Q1 is connected to the negative electrode of the voltage regulator tube DW1 through the resistor R1, the positive electrode of the voltage regulator tube DW1 is connected to the negative electrode of the voltage regulator tube DW2, the positive electrode of the voltage regulator tube DW2 is grounded, the source of the PMOS tube Q1 is connected to the gate of the PMOS tube Q1 through the resistor R2, the gate of the PMOS tube Q1 is connected to the collector of the transistor Q2 through the resistor R3, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is grounded through the capacitor C1, and the base of the transistor Q2 is connected to the negative electrode of the voltage regulator tube DW2 through the resistor R4.

[0015] Further, the detection switching circuit includes a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R1, a resistor R12, a resistor R13, a resistor R16, a PMOS tube Q3, a transistor Q4, a transistor Q5, a capacitor C4, a capacitor C3, and a voltage regulator tube DW3;

[0016] The source of the PMOS tube Q3 is connected to the positive electrode of the battery as the input end of the detection switching circuit, the drain of the PMOS tube Q3 is connected to the gate of the PMOS tube Q3 through the resistor R9, the gate of the PMOS tube Q3 is connected to the collector of the transistor Q5 through the resistor R12, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 is grounded through the capacitor C4, the base of the transistor Q5 is connected to the collector of the transistor Q4 through the resistor R11, and the emitter of the transistor Q4 is connected to the source of the PMOS tube Q3 through the resistor R8;

[0017] One end of the resistor R6 is connected to the drain of the PMOS tube Q1 as the detection input end of the detection control circuit, and the other end of the resistor R6 is grounded through the resistor R10. The common connection point of the resistor R6 and the resistor R10 is connected to the negative electrode of the voltage regulator tube DW3, and the positive electrode of the voltage regulator tube DW3 is grounded. The common connection point of the resistor R6 and the resistor R10 is connected to the base of the transistor Q4 through the resistor R7, and the base of the transistor Q4 is connected to the ground after being connected in series through the resistor R16 and the capacitor C3.

[0018] Further, the boost circuit includes an inverter circuit, an inverter controller, a transformer, a sixth voltage stabilizing module DC-DCVI and a controller power supply circuit;

[0019] The input end of the inverter circuit is connected to the output end of the detection switching circuit, the output end of the inverter circuit is connected to the primary winding of the transformer, the secondary winding of the transformer is connected to the input end of the sixth voltage stabilizing module DC-DCVI, the output end of the sixth voltage stabilizing module DC-DCVI supplies power to the load and the input end of the multi-output voltage stabilizing module, the control output end of the inverter controller is connected to the control end of the inverter, the input end of the controller power supply circuit is connected to the positive electrode of the battery, the output end of the controller power supply circuit supplies power to the inverter controller, and the control end of the controller power supply circuit is connected to the collector of the transistor Q4.

[0020] Further, the controller power supply circuit includes an NMOS tube Q6, a resistor R13, a resistor R14, a resistor R15, a capacitor C5, a capacitor C6, and a fifth voltage stabilizing circuit V;

[0021] The drain of the NMOS tube Q6 serves as the input end of the controller power supply circuit, the source of the NMOS tube Q6 is connected to ground after being connected in series with the resistor R14 and the resistor R15, the common connection point of the resistor R15 and the resistor R14 is grounded through the capacitor C5, the common connection point of the resistor R15 and the resistor R14 is connected to the input end of the fifth voltage stabilizing circuit V, the output end of the fifth voltage stabilizing circuit V is grounded through the capacitor C6, the output end of the fifth voltage stabilizing circuit V supplies power to the inverter controller, the gate of the NMOS tube Q6 is connected to one end of the resistor R13, and the other end of the resistor R13 serves as the control input end of the controller power supply circuit.

[0022] The beneficial effects of the present invention are as follows: Through the present invention, DC power of various voltage levels can be provided to DC loads in the power system without the need for an additional DC power supply. Moreover, during the power supply process, the DC power can be subjected to overvoltage, undervoltage and power-off detection, and almost uninterrupted power supply to the DC system can be achieved. In addition, the entire system has high stability and a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 The schematic diagram is a circuit diagram for a specific implementation of the present invention. DETAILED DESCRIPTION

[0026] The invention is further described in detail below in conjunction with the accompanying drawings:

[0027] A multi-output DC power system provided by the present invention comprises a switch control circuit, a multi-channel output voltage stabilizing module, a storage battery, a battery management circuit, a boost circuit and a detection switching circuit;

[0028] The input of the switch detection circuit is connected to 220V DC, the output of the switch control circuit is connected to the input of the load and the multi-channel output voltage stabilizing module, the input of the battery management circuit is connected to the output of the switch control circuit, the output of the battery management circuit is connected to the positive electrode of the battery, the positive electrode of the battery is connected to the input of the detection switching circuit, the output of the detection switching circuit is connected to the input of the boost circuit, the output of the boost circuit is powered on to the load and the input of the multi-channel output voltage stabilizing module, and the detection input of the detection switching circuit is connected to the output of the switch control circuit; through the above structure, a variety of DC loads in the power system can be provided. Direct current of different voltage levels does not require an additional DC power supply. Moreover, during the power supply process, the DC can be detected for overvoltage, undervoltage and power failure, and the DC system can be almost uninterrupted (almost uninterrupted means that the 220V main circuit has a power failure, including overvoltage, undervoltage and fault power failure. The backup circuit composed of the battery can be cut into the power supply in time. Although there is a certain time gap (millisecond level), the gap does not affect the power consumption of the DC system). The whole system has high stability and simple structure. In addition, no external controller is required for control in the switching between the main power supply circuit and the battery power supply. The battery management circuit adopts the existing lithium battery management circuit.

[0029] In this embodiment, the multi-channel output voltage stabilizing module includes a first voltage stabilizing module DC-DCⅠ, a second voltage stabilizing module DC-DCⅡ, a third voltage stabilizing module DC-DCⅢ, a fourth voltage stabilizing module DC-DCⅣ, a resistor R5, a diode D2, a resistor R5, a resistor R6 and a capacitor C2;

[0030] One end of the resistor R5 is connected to the output end of the switch control circuit as the input end of the multi-channel output voltage regulator module, the other end of the resistor R5 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is grounded through the capacitor C2, the negative electrode of the diode D2 is connected to the input end of the first voltage regulator module DC-DCⅠ through the resistor R6, and the output end of the first voltage regulator module DC-DCⅠ outputs 48V DC;

[0031] The input end of the second voltage stabilizing module DC-DCⅡ is connected to the output end of the first voltage stabilizing module DC-DCⅠ, and the second voltage stabilizing module DC-DCⅡ outputs 24V direct current;

[0032] The input end of the third voltage stabilizing module DC-DCⅢ is connected to the output end of the second voltage stabilizing module DC-DCⅡ, and the third voltage stabilizing module DC-DCⅢ outputs 12V direct current;

[0033] The input end of the fourth voltage stabilizing module DC-DCⅣ is connected to the output end of the third voltage stabilizing module DC-DCⅢ, and the fourth voltage stabilizing module DC-DCⅣ outputs 5V DC. Through the above structure, it can provide stable working power for low-voltage electrical equipment (such as various sensors and monitoring controllers, etc.) to meet the needs of different application scenarios. Among them, the first voltage stabilizing module DC-DCⅠ, the second voltage stabilizing module DC-DCⅡ, the third voltage stabilizing module DC-DCⅢ, and the fourth voltage stabilizing module DC-DCⅣ can use existing voltage stabilizing chips and peripheral circuits. Users can select according to actual needs, and their principles and structures will not be elaborated here.

[0034] In this embodiment, the switch control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a voltage regulator DW1, a voltage regulator DW2, a capacitor C1, a PMOS transistor Q1, a transistor Q2 and a silicon chain D1;

[0035] The source of the PMOS tube Q1 is used as the input end of the switch control circuit, the drain of the PMOS tube Q1 is connected to the positive electrode of the silicon chain D1, and the negative electrode of the silicon chain D1 is used as the output end of the switch control circuit;

[0036] The source of the PMOS tube Q1 is connected to the negative electrode of the voltage regulator tube DW1 through the resistor R1, the positive electrode of the voltage regulator tube DW1 is connected to the negative electrode of the voltage regulator tube DW2, the positive electrode of the voltage regulator tube DW2 is grounded, the source of the PMOS tube Q1 is connected to the gate of the PMOS tube Q1 through the resistor R2, the gate of the PMOS tube Q1 is connected to the collector of the transistor Q2 through the resistor R3, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is grounded through the capacitor C1, and the base of the transistor Q2 is connected to the negative electrode of the voltage regulator tube DW2 through the resistor R4. Through the above structure, the voltage regulator tubes DW1 and DW2 are connected in series to form a relatively simple undervoltage and overvoltage detection, that is, when the voltage of the 220V DC power is too low due to fluctuations, undervoltage occurs. Then the voltage regulator DW1 is turned off, and the PMOS tube Q1 is turned off, thereby disconnecting the main circuit power supply. When the voltage is too high, the voltage regulator DW1 and the voltage regulator DW2 are turned on at the same time, so that the triode Q2 is turned off, and the PMOS tube Q1 is turned off, and neither of them will supply power to the subsequent load. Through the above structure, overvoltage and undervoltage detection and protection can be achieved. Among them, the PMOS tube selects a PMOS tube with a higher withstand voltage, such as the IRFP254 series PMOS tube, whose withstand voltage can reach 250V, and the IRF350 series PMOS tube, whose withstand voltage can reach 500V. These are all existing technologies and will not be elaborated here. Among them, the silicon chain D1 is used to prevent the detection control circuit from malfunctioning when the battery is powered.

[0037] In this embodiment, the detection switching circuit includes resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R1, resistor R12, resistor R13, resistor R16, PMOS tube Q3, transistor Q4, transistor Q5, capacitor C4, capacitor C3, and voltage regulator tube DW3;

[0038] The source of the PMOS tube Q3 is connected to the positive electrode of the battery as the input end of the detection switching circuit, the drain of the PMOS tube Q3 is connected to the gate of the PMOS tube Q3 through the resistor R9, the gate of the PMOS tube Q3 is connected to the collector of the transistor Q5 through the resistor R12, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 is grounded through the capacitor C4, the base of the transistor Q5 is connected to the collector of the transistor Q4 through the resistor R11, and the emitter of the transistor Q4 is connected to the source of the PMOS tube Q3 through the resistor R8;

[0039] One end of the resistor R6 is connected to the drain of the PMOS tube Q1 as the detection input end of the detection control circuit, the other end of the resistor R6 is grounded through the resistor R10, the common connection point of the resistor R6 and the resistor R10 is connected to the negative electrode of the voltage regulator tube DW3, the positive electrode of the voltage regulator tube DW3 is grounded, the common connection point of the resistor R6 and the resistor R10 is connected to the base of the transistor Q4 through the resistor R7, the base of the transistor Q4 is connected in series with the resistor R16 and the capacitor C3 and then grounded, wherein the PMOS tube Q3 is the same as the PMOS tube Q1, and the existing PMOS tube with higher withstand voltage. When PMOS tube Q1 is turned on, resistors R6 and R10 form a voltage divider circuit, and provide it to the base of transistor Q4 after voltage limiting through resistor R7. At this time, the base voltage of transistor Q4 is higher than the emitter voltage (transistor Q4 is a P-type transistor), transistor Q4 is cut off, transistor Q5 is cut off, PMOS tube Q3 is cut off, and the battery does not supply power. When the PMOS tube has no output, including overvoltage, undervoltage or 220V DC power failure, at this time, there is no voltage between resistor R6 and resistor R10. Output, however, due to the effect of capacitor C3, when the drain of the PMOS tube is powered off, capacitor C3 will maintain a voltage state for a short time, and a discharge loop will be formed through the positive electrode of capacitor C3, resistor R16, resistor R7, resistor R10 and the negative electrode of capacitor C3. At this time, the base of transistor Q4 will maintain a certain voltage and keep transistor Q4 turned on for a certain time when the PMOS tube Q1 is turned off. This time is used for buffering to prevent malfunction. When the voltage of capacitor C3 drops, transistor Q4 is turned on. When the capacitor C4 is charged, before the voltage of the capacitor C4 reaches the base-emitter conduction voltage of the transistor Q5, the controller power supply circuit is turned on, so that the inverter controller starts and enters initialization. When the transistor Q5 is turned on and the PMOS tube Q3 is turned on, the inverter in the boost circuit enters the working state, and then the voltage is boosted by the transformer and processed by the sixth voltage stabilizing module DC-DCVI to output 220V direct current. Through the above structure, the 220V main circuit can be quickly switched to the backup circuit composed of the battery, and the switching is stable and reliable.

[0040] In this embodiment, the boost circuit includes an inverter circuit, an inverter controller, a transformer, a sixth voltage stabilizing module DC-DCVI, and a controller power supply circuit;

[0041] The input end of the inverter circuit is connected to the output end of the detection switching circuit, the output end of the inverter circuit is connected to the primary winding of the transformer, the secondary winding of the transformer is connected to the input end of the sixth voltage stabilizing module DC-DCVI, the output end of the sixth voltage stabilizing module DC-DCVI supplies power to the load and the input end of the multi-channel output voltage stabilizing module, the control output end of the inverter controller is connected to the control end of the inverter, the input end of the controller power supply circuit is connected to the positive electrode of the battery, the output end of the controller power supply circuit supplies power to the inverter controller, and the control end of the controller power supply circuit is connected to the collector of the transistor Q4, wherein the inverter is an existing structure, using an inverter composed of IGBT, the inverter controller uses an existing control chip, and the sixth voltage stabilizing module DC-DCVI uses an existing DC-DC conversion circuit. Through the above structure, the direct current output of the battery can be converted into a stable 220V direct current and provided to the load and the multi-channel output voltage stabilizing module.

[0042] In this embodiment, the controller power supply circuit includes an NMOS tube Q6, a resistor R13, a resistor R14, a resistor R15, a capacitor C5, a capacitor C6, and a fifth voltage stabilizing circuit V;

[0043] The drain of the NMOS tube Q6 serves as the input end of the controller power supply circuit, the source of the NMOS tube Q6 is connected to ground after being connected in series through the resistor R14 and the resistor R15, the common connection point of the resistor R15 and the resistor R14 is grounded through the capacitor C5, the common connection point of the resistor R15 and the resistor R14 is connected to the input end of the fifth voltage stabilizing circuit V, the output end of the fifth voltage stabilizing circuit V is grounded through the capacitor C6, the output end of the fifth voltage stabilizing circuit V supplies power to the inverter controller, the gate of the NMOS tube Q6 is connected to one end of the resistor R13, and the other end of the resistor R13 serves as the control input end of the controller power supply circuit. Through the above structure, the startup time of the inverter controller can be accurately controlled to ensure that the inverter controller is stably powered and independent of the multi-channel output voltage stabilizing module. The fifth voltage stabilizing circuit V adopts an existing DC-DC voltage stabilizing circuit, which is selected according to the working voltage of the inverter controller, such as LM2596, LM7809, etc.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A multi-output DC power system, characterized in that: It includes a switch control circuit, a multi-channel output voltage stabilization module, a battery, a battery management circuit, a boost circuit and a detection switching circuit; The input end of the switch control circuit is connected to a 220V direct current, the output end of the switch control circuit is connected to the input end of the load and the multi-channel output voltage stabilizing module, the input end of the battery management circuit is connected to the output end of the switch control circuit, the output end of the battery management circuit is connected to the positive electrode of the battery, the positive electrode of the battery is connected to the input end of the detection switching circuit, the output end of the detection switching circuit is connected to the input end of the boost circuit, the output end of the boost circuit is energized to the load and the input end of the multi-channel output voltage stabilizing module, and the detection input end of the detection switching circuit is connected to the output end of the switch control circuit; The switch control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a voltage regulator DW1, a voltage regulator DW2, a capacitor C1, a PMOS transistor Q1, a transistor Q2 and a silicon chain D1; The source of the PMOS tube Q1 is used as the input end of the switch control circuit, the drain of the PMOS tube Q1 is connected to the positive electrode of the silicon chain D1, and the negative electrode of the silicon chain D1 is used as the output end of the switch control circuit; The source of the PMOS tube Q1 is connected to the negative electrode of the voltage regulator tube DW1 through the resistor R1, the positive electrode of the voltage regulator tube DW1 is connected to the negative electrode of the voltage regulator tube DW2, the positive electrode of the voltage regulator tube DW2 is grounded, the source of the PMOS tube Q1 is connected to the gate of the PMOS tube Q1 through the resistor R2, the gate of the PMOS tube Q1 is connected to the collector of the transistor Q2 through the resistor R3, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is grounded through the capacitor C1, and the base of the transistor Q2 is connected to the negative electrode of the voltage regulator tube DW2 through the resistor R4; The detection switching circuit includes a resistor R17, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R16, a PMOS tube Q3, a transistor Q4, a transistor Q5, a capacitor C4, a capacitor C3, and a voltage regulator tube DW3; The source of the PMOS tube Q3 is connected to the positive electrode of the battery as the input end of the detection switching circuit, the drain of the PMOS tube Q3 is connected to the gate of the PMOS tube Q3 through the resistor R9, the gate of the PMOS tube Q3 is connected to the collector of the transistor Q5 through the resistor R12, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 is grounded through the capacitor C4, the base of the transistor Q5 is connected to the collector of the transistor Q4 through the resistor R11, and the emitter of the transistor Q4 is connected to the source of the PMOS tube Q3 through the resistor R8; One end of the resistor R17 is connected to the drain of the PMOS tube Q1 as the detection input end of the detection control circuit, and the other end of the resistor R17 is grounded through the resistor R10. The common connection point of the resistor R17 and the resistor R10 is connected to the negative electrode of the voltage regulator tube DW3, and the positive electrode of the voltage regulator tube DW3 is grounded. The common connection point of the resistor R17 and the resistor R10 is connected to the base of the transistor Q4 through the resistor R7, and the base of the transistor Q4 is connected to the ground after being connected in series through the resistor R16 and the capacitor C3.

2. The multi-output DC power system according to claim 1, characterized in that: The multi-channel output voltage stabilizing module includes a first voltage stabilizing module DC-DCⅠ, a second voltage stabilizing module DC-DCⅡ, a third voltage stabilizing module DC-DCⅢ, a fourth voltage stabilizing module DC-DCⅣ, a resistor R5, a diode D2, a resistor R6 and a capacitor C2; One end of the resistor R5 is connected to the output end of the switch control circuit as the input end of the multi-channel output voltage regulator module, the other end of the resistor R5 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is grounded through the capacitor C2, the negative electrode of the diode D2 is connected to the input end of the first voltage regulator module DC-DCⅠ through the resistor R6, and the output end of the first voltage regulator module DC-DCⅠ outputs 48V DC; The input end of the second voltage stabilizing module DC-DCⅡ is connected to the output end of the first voltage stabilizing module DC-DCⅠ, and the second voltage stabilizing module DC-DCⅡ outputs 24V direct current; The input end of the third voltage stabilizing module DC-DCⅢ is connected to the output end of the second voltage stabilizing module DC-DCⅡ, and the third voltage stabilizing module DC-DCⅢ outputs 12V direct current; The input end of the fourth voltage stabilizing module DC-DCⅣ is connected to the output end of the third voltage stabilizing module DC-DCⅢ, and the fourth voltage stabilizing module DC-DCⅣ outputs 5V direct current.

3. The multi-output DC power system according to claim 1, characterized in that: The boost circuit includes an inverter circuit, an inverter controller, a transformer, a sixth voltage stabilizing module DC-DCVI and a controller power supply circuit; The input end of the inverter circuit is connected to the output end of the detection switching circuit, the output end of the inverter circuit is connected to the primary winding of the transformer, the secondary winding of the transformer is connected to the input end of the sixth voltage stabilizing module DC-DCVI, the output end of the sixth voltage stabilizing module DC-DCVI supplies power to the load and the input end of the multi-output voltage stabilizing module, the control output end of the inverter controller is connected to the control end of the inverter, the input end of the controller power supply circuit is connected to the positive electrode of the battery, the output end of the controller power supply circuit supplies power to the inverter controller, and the control end of the controller power supply circuit is connected to the collector of the transistor Q4.

4. The multi-output DC power system according to claim 3, characterized in that: The controller power supply circuit includes an NMOS tube Q6, a resistor R13, a resistor R14, a resistor R15, a capacitor C5, a capacitor C6, and a fifth voltage stabilizing circuit V; The drain of the NMOS tube Q6 serves as the input end of the controller power supply circuit, the source of the NMOS tube Q6 is connected to ground after being connected in series with the resistor R14 and the resistor R15, the common connection point of the resistor R15 and the resistor R14 is grounded through the capacitor C5, the common connection point of the resistor R15 and the resistor R14 is connected to the input end of the fifth voltage stabilizing circuit V, the output end of the fifth voltage stabilizing circuit V is grounded through the capacitor C6, the output end of the fifth voltage stabilizing circuit V supplies power to the inverter controller, the gate of the NMOS tube Q6 is connected to one end of the resistor R13, and the other end of the resistor R13 serves as the control input end of the controller power supply circuit.

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