Multi-output DCACDC converter

Abstract

The utility model provides a multi-output DCACDC converter, and belongs to the technical field of unmanned aerial vehicles. Comprising a Boost circuit, a full-bridge inverter circuit and a full-bridge controllable rectifier circuit, the input end of the Boost circuit is connected with the output end of the hydrogen fuel cell, and the Boost circuit is used for boosting unstable direct-current low voltage output by the hydrogen fuel cell to a stable voltage level. According to the utility model, the output voltage of the hydrogen fuel cell is processed through the Boost circuit, unstable direct-current low voltage is boosted to a stable voltage level, and then a stable and adaptive power supply is provided for the unmanned aerial vehicle through the cooperation of the full-bridge inverter circuit and the full-bridge controllable rectifier circuit. And the full-bridge controllable rectifying circuit is provided with a plurality of transformers SW1, a plurality of switches, a capacitor C2, a resistor R5 and other elements, so that output of different voltage levels and power is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to unmanned plane technical field, especially a kind of multi-output DC\AC\DC converter. BACKGROUND

[0002] With the rapid development of civil aviation industry, unmanned plane field as a branch of civil aviation field, also more and more people favour, and widely used in various fields, expand unmanned plane market.Hydrogen fuel cell unmanned plane can effectively improve the endurance time of unmanned plane and reduce the volume of unmanned plane.

[0003] But due to the output voltage fluctuation of hydrogen fuel cell is big, extremely unstable, and unmanned plane electrical application environment is complex, DC (Direct Current) direct current of fuel cell output cannot be directly used to unmanned plane. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem that the output voltage of hydrogen fuel cell is unstable and cannot be directly used to unmanned plane, and the technical problem that DC\AC\DC converter cannot realize multi-output.

[0005] Technical scheme: in order to realize above object, the utility model is realized by the following technical scheme: a kind of multi-output DC\AC\DC converter, comprising: Boost circuit, full-bridge inverter circuit and full-bridge controllable rectifier circuit, Boost circuit, its input end connects the output end of hydrogen fuel cell, for the unstable direct current low voltage output by hydrogen fuel cell is raised to stable voltage level;Boost circuit includes inductance, capacitor C1, diode D1 and switch Q1, one end of inductance is connected with the anode of diode D1 with the positive pole of direct current power supply, the other end is connected with the anode of diode D1, the cathode of diode D1 is connected with the positive pole of capacitor C1, the negative pole of capacitor C1 is connected with the negative pole of direct current power supply, the drain of switch Q1 is connected in the other end of inductance, and the source is connected in the negative pole of direct current power supply;Full-bridge inverter circuit, its input end connects the output end of Boost circuit, for converting the direct current voltage after voltage rise into alternating voltage;Full-bridge controllable rectifier circuit, its input end connects the output end of full-bridge inverter circuit, rectifies, filters and electrically isolates to alternating voltage, and changes duty cycle control output stable direct current voltage, to provide the power supply of adaptation unmanned plane.

[0006] In a further embodiment, two Q3, Q4 and Q5, the source of first Q3 is connected with the negative pole of capacitor C1, the drain is connected with the source of second Q3, the drain of second Q3 is connected with the positive pole of capacitor C1, the drain of Q4 is connected with the positive pole of capacitor C1, the source is connected with the drain of Q5, the source of Q5 is connected with the negative pole of capacitor C1.

[0007] In a further embodiment, the plurality of transformers SW1, the plurality of switches Q3, the switch Q2, the switch Q4 and the switch Q5, the pin 1 of the first transformer SW1 is connected between two switches Q3 in the full-bridge inverter circuit, the pin 2 is connected with the pin 1 of the second transformer SW1, the pin 2 of the second transformer SW1 is connected with the pin 1 of the third transformer SW1, and so on, the pin 2 of the last transformer SW1 is connected between two switches Q4 and Q5 in the full-bridge inverter circuit, the pin 3 of each transformer is connected with the source of the switch Q2 and the switch Q4 in the full-bridge controlled rectifier circuit, and the pin 4 is connected with the drain of the switch Q3 and the switch Q5 in the full-bridge controlled rectifier circuit, so as to realize the output of different voltage levels and power.

[0008] In a further embodiment, the capacitor C2 and the resistor R5, the two ends of the capacitor C2 are respectively connected with the two ends of the resistor R5, one end of the resistor R5 is connected between the switch Q3 and the switch Q2 in the full-bridge controlled rectifier circuit, and the other end is connected between the switch Q4 and the switch Q5 in the full-bridge controlled rectifier circuit, so as to realize the output of different voltage levels and power.

[0009] In a further embodiment, the power supply circuit, the power supply circuit includes the chip U2, the capacitors C5, C6, C7, C8, the inductor L2 and the diode D8, the VIN pin of the chip U2 is connected with DC1, and the VIN pin is connected with a +12V direct current power supply, the OUTPUT pin is connected with the VIN pin, the GND pin is connected with the ON / OFF pin, the FB pin is connected with the anode of the diode D8, the cathode of the diode D8 is connected with the VIN pin, the positive electrode of the capacitor C5 is connected with the VIN pin, and the negative electrode is connected with the ON / OFF pin, one end of the capacitor C7 is connected with the VIN pin, and the other end is connected with the ON / OFF pin, and the ON / OFF pin is grounded, one end of the inductor L2 is connected with the cathode of D8, and the other end is connected with the FB pin, the positive electrode of the capacitor C6 is connected with the other end of the inductor L1, and the negative electrode is connected with the FB pin, one end of the capacitor C8 is connected with the other end of the inductor L1, and the other end is connected with the FB pin, so as to realize the power supply for the Boost circuit, the full-bridge inverter circuit and the full-bridge controlled rectifier circuit.

[0010] In a further embodiment, a DC sampling circuit is included, comprising a chip U1, resistors R12, R13, R15, R61, a diode D7, and capacitors C3 and C4. Resistor R12 is connected between the OUT1 and -IN1 pins of chip U1. The OUT1 pin is connected to the +IN2 pin. The -IN1 pin is connected to the same node as resistors R13 and R12, with the other end of resistor R13 grounded. The +IN1 pin is connected to the same node as resistors R15 and R61, with the other end of resistor R15 grounded and connected to the VEE pin. The other end of resistor R61 is connected to the output voltage VOUT. The VCC pin is connected to a +5V power supply. The OUT2 pin is connected to the negative terminal of diode D7, and the anode of diode D7 is connected to the VEE pin. Capacitors C3 and C4 are connected in parallel, with one end of capacitors C3 and C4 connected to the VCC pin and the other end connected to the VEE pin.

[0011] In a further embodiment, the driving circuit includes a chip U1, multiple resistors R16, and multiple optocoupler driving circuits. The multiple resistors R16 are respectively connected to pins 1A, 2A...11A in the chip U1, and the other end of the resistors R16 is grounded. The multiple optocoupler driving circuits are respectively connected to pins 1Y, 2Y...11Y in the chip U1 to achieve precise control of the full-bridge inverter circuit and the full-bridge controllable rectifier circuit.

[0012] In a further embodiment, the power supply circuit is further provided with two light-emitting diodes LED1 and LED2. Resistors R19 and R20 are respectively connected to the anodes of the two light-emitting diodes LED1 and LED2. The other end of resistor R19 is connected to a +12V power supply, and the other end of resistor R20 is connected to a +5V power supply. The cathodes of light-emitting diodes LED1 and LED2 are grounded.

[0013] In a further embodiment, the optocoupler driving circuit includes a chip, a capacitor, and a resistor. The AN pin of the chip is connected to one end of the resistor, and the other end of the resistor is connected to a +5V power supply. The capacitor is connected in series between the VCC pin and the GND pin, and the VCC pin is connected to a +12V power supply. The CAT pin of the chip is connected to the 1Y pin of the chip U1 in the driving circuit. A transformer is connected between the two VO pins of the chip.

[0014] Beneficial effects: 1. The Boost circuit processes the output voltage of the hydrogen fuel cell, raising the unstable low DC voltage to a stable voltage level, providing a reliable input for subsequent circuits; the full-bridge inverter circuit converts the boosted DC voltage into AC voltage, further adjusting the voltage form; while the full-bridge controllable rectifier circuit rectifies, filters, and electrically isolates the AC voltage, and changes the duty cycle to control the output stable DC voltage, ensuring that the final power supplied to the drone is highly stable and compatible; enabling the drone to obtain power stably.

[0015] 2、Its full-bridge controllable rectifier circuit through the setting of multiple transformer SW1, multiple switches and capacitor C2 and resistor R5 and other elements, realizes the output of different voltage levels and power; Its multi-output capability can meet the diversified demand of different components in the complex electrical system of unmanned aerial vehicle for power supply, without individually equipping each component with a converter. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 It is a DC\AC\DC converter main framework diagram.

[0018] Figure 2 It is a converter main circuit diagram.

[0019] Figure 3 It is a power supply circuit diagram.

[0020] Figure 4 It is a direct current sampling circuit diagram.

[0021] Figure 5 It is a driving circuit diagram.

[0022] Figure 6 It is a multi-output DC\AC\DC converter design parameter diagram.

[0023] Figure 7 It is a multi-output DC\AC\DC converter test result diagram

[0024] The reference numerals in the drawings are: 1, Boost circuit; 2, full-bridge inverter circuit; 3, full-bridge controllable rectifier circuit. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the present application is described clearly and completely. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0026] The embodiment of the application provides a multi-output DC\AC\DC converter, solves the problem that the output voltage of a hydrogen fuel cell is unstable and cannot be directly used for a UAV, and solves the problem that a DC\AC\DC converter cannot realize multi-output. In actual use, the output voltage of the hydrogen fuel cell is stabilized, so that the hydrogen fuel cell can be applied to the UAV, and the purpose of realizing multi-output of the DC\AC\DC converter is achieved.

[0027] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings of the specification and specific embodiments.

[0028] With reference to Figures 1-7 A multi-output DC\AC\DC converter, comprising: a Boost circuit 1, a full-bridge inverter circuit 2 and a full-bridge controllable rectifier circuit 3; the Boost circuit 1 is connected to the output end of the hydrogen fuel cell at the input end, and is used to raise the unstable direct current low voltage output by the hydrogen fuel cell to a stable voltage level; the Boost circuit 1 comprises an inductor, a capacitor C1, a diode D1 and a switch Q1, one end of the inductor is connected to the positive pole of the direct current power supply, the other end is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the positive pole of the capacitor C1, the negative pole of the capacitor C1 is connected to the negative pole of the direct current power supply, the drain of the switch Q1 is connected to the other end of the inductor, and the source is connected to the negative pole of the direct current power supply; the input end of the full-bridge inverter circuit 2 is connected to the output end of the Boost circuit 1, and is used to convert the boosted direct current voltage into alternating current voltage; the input end of the full-bridge controllable rectifier circuit 3 is connected to the output end of the full-bridge inverter circuit 2, the alternating current voltage is rectified, filtered and electrically isolated, the duty cycle is changed to control the output stable direct current voltage, and the power supply suitable for the UAV is provided.

[0029] The unstable low voltage of the hydrogen fuel cell is boosted, inverted, rectified and stabilized, so that the stable direct current power supply suitable for the UAV is converted, and the basic framework and voltage conversion process of the entire multi-output DC / AC / DC converter are constructed.

[0030] Two Q3, Q4 and Q5, the source of the first Q3 is connected to the negative pole of the capacitor C1, the drain is connected to the source of the second Q3, the drain of the second Q3 is connected to the positive pole of the capacitor C1, the drain of Q4 is connected to the positive pole of the capacitor C1, the source is connected to the drain of Q5, and the source of Q5 is connected to the negative pole of the capacitor C1.

[0031] Through the specific connection mode of the switches Q3, Q4 and Q5, the direct current to alternating current conversion function is realized in the full-bridge inverter circuit 2, and alternating current input is provided for the subsequent controllable rectifier link.

[0032] The plurality of transformers SW1, the plurality of switches Q3, the switch Q2, the switch Q4 and the switch Q5, the pin 1 of the first transformer SW1 is connected between two switches Q3 in the full-bridge inverter circuit 2, the pin 2 is connected with the pin 1 of the second transformer SW1, the pin 2 of the second transformer SW1 is connected with the pin 1 of the third transformer SW1, and so on, the pin 2 of the last transformer SW1 is connected between two switches Q4 and Q5 in the full-bridge inverter circuit 2, the pin 3 of each transformer is connected with the source of the switch Q2 and the switch Q4 in the full-bridge controllable rectifier circuit 3, and the pin 4 is connected with the drain of the switch Q3 and the switch Q5 in the full-bridge controllable rectifier circuit 3, so as to realize the output of different voltage levels and power.

[0033] The combination connection of the plurality of transformers SW1 and the plurality of switches realizes the multi-voltage level and power output function of the full-bridge controllable rectifier circuit 3, and meets the diversified power supply requirements of different components of the unmanned aerial vehicle.

[0034] The capacitor C2 and the resistor R5, the two ends of the capacitor C2 are respectively connected with the two ends of the resistor R5, one end of the resistor R5 is connected between the switch Q3 and the switch Q2 in the full-bridge controllable rectifier circuit 3, and the other end is connected between the switch Q4 and the switch Q5 in the full-bridge controllable rectifier circuit 3, so as to realize the output of different voltage levels and power.

[0035] With the connection of the capacitor C2 and the resistor R5, the full-bridge controllable rectifier circuit 3 is further assisted to realize the output adjustment of different voltage levels and power, and the output characteristics are optimized.

[0036] The power supply circuit includes a chip U2, capacitors C5, C6, C7, C8, an inductor L2 and a diode D8, the VIN pin of the chip U2 is connected with DC1, and the VIN pin is connected with a +12V direct current power supply, the OUTPUT pin is connected with the VIN pin, the GND pin is connected with the ON / OFF pin, the FB pin is connected with the anode of the diode D8, the cathode of the diode D8 is connected with the VIN pin, the positive electrode of the capacitor C5 is connected with the VIN pin, the negative electrode is connected with the ON / OFF pin, one end of the capacitor C7 is connected with the VIN pin, the other end is connected with the ON / OFF pin, and the ON / OFF pin is grounded, one end of the inductor L2 is connected with the cathode of D8, the other end is connected with the FB pin, the positive electrode of the capacitor C6 is connected with the other end of the inductor L1, the negative electrode is connected with the FB pin, one end of the capacitor C8 is connected with the other end of the inductor L1, the other end is connected with the FB pin, so as to realize the power supply for the Boost circuit 1, the full-bridge inverter circuit 2 and the full-bridge controllable rectifier circuit 3.

[0037] The power supply circuit is successfully constructed, and the chip U2 and related capacitors, inductors and diodes are used to provide stable operating power supply for the Boost circuit, full-bridge inverter circuit 2 and full-bridge controllable rectifier circuit 3, thereby ensuring the normal operation of the entire converter system.

[0038] The direct current sampling circuit comprises the chip U1, resistors R12, R13, R15 and R61, diode D7 and capacitors C3 and C4, the resistor R12 is connected between the OUT1 pin and the -IN1 pin of the chip U1, the OUT1 pin is connected with the +IN2 pin, the -IN1 pin is connected with the resistors R13 and R12 at the same node, the other end of the resistor R13 is grounded, the +IN1 pin is connected with the resistors R15 and R61 at the same node, the other end of the resistor R15 is grounded and connected with the VEE pin, the other end of the resistor R61 is connected with the output voltage VOUT, the VCC pin is connected with the +5V power supply, the OUT2 pin is connected with the negative electrode of the diode D7, the positive electrode of the diode D7 is connected with the VEE pin, the capacitors C3 and C4 are connected in parallel, one end of the capacitors C3 and C4 is connected with the VCC pin, and the other end is connected with the VEE pin.

[0039] The chip U1 and related resistors, diodes and capacitors are used to realize the sampling monitoring of the output voltage, thereby providing data basis for the subsequent voltage control and adjustment.

[0040] The driving circuit comprises the chip U1, a plurality of resistors R16 and a plurality of optocoupler driving circuits, the plurality of resistors R16 are respectively connected to the 1A, 2A...11A pins in the chip U1, the other end of the resistor R16 is grounded, and the plurality of optocoupler driving circuits are respectively connected to the 1Y, 2Y...11Y pins in the chip U1, so as to realize the accurate control of the full-bridge inverter circuit 2 and the full-bridge controllable rectifier circuit 3.

[0041] The chip U1, the resistor R16 and the optocoupler driving circuit are used to realize the accurate control of the switching elements in the full-bridge inverter circuit 2 and the full-bridge controllable rectifier circuit 3, thereby ensuring that the circuit works according to the predetermined logic.

[0042] Two light emitting diodes LED1 and LED2 are arranged in the power supply circuit, the anodes of the two light emitting diodes LED1 and LED2 are respectively connected with the resistors R19 and R20, the other end of the resistor R19 is connected with the +12V power supply, the other end of the resistor R20 is connected with the +5V power supply, and the cathodes of the light emitting diodes LED1 and LED2 are grounded.

[0043] The light emitting diodes LED1 and LED2 are arranged in the power supply circuit and connected through corresponding resistors, thereby realizing the indication function of the +12V and +5V power supply states, and facilitating the intuitive understanding of the power supply condition.

[0044] The light coupling driving circuit comprises a chip, a capacitor and a resistor, the AN pin of the chip is connected with one end of the resistor, the other end of the resistor is connected with a +5V power supply, the capacitor is connected in series between the VCC pin and the GND pin, the VCC pin is connected with a +12V power supply, the CAT pin in the chip is connected with the 1Y pin of the chip U1 in the driving circuit, and the two VO pins in the chip are connected with the transformer.

[0045] Through the connection of the chip, the capacitor, the resistor and the transformer, electrical isolation and signal conversion are realized, the control signal is converted into a signal suitable for driving a power switch device, and the reliability of the driving is ensured.

[0046] The turns ratio of the transformers in the plurality of light coupling driving circuits is respectively 2:1, 2:2, 3:1...

[0047] By setting the transformers with different turns ratios, the adaptation of the light coupling driving circuit to different driving requirements is met, and the driving effect and flexibility are further enhanced.

[0048] In use, the unstable direct current low voltage output by the hydrogen fuel cell enters the Boost circuit, the current passes through elements such as the inductor, the diode D1 and the switch Q1, the inductor stores and discharges energy, the capacitor C1 is charged to realize voltage boosting and stabilizing, the stable voltage enters the full-bridge inverter circuit 2, the current flows in the loop formed by Q3, Q4 and Q5, and the direct current to alternating current conversion is completed through the on-off control of Q3, Q4 and Q5; the alternating voltage enters the full-bridge controllable rectifier circuit 3, a plurality of transformers SW1 and related switches work cooperatively, the current forms a loop between the pins and the switches, and through the capacitor C2 and the resistor R5, different transformer turns ratios and switch combinations are used to realize multiple voltage levels and power output, solve the problem of multiple output of the converter, and provide an adaptive power supply for the unmanned aerial vehicle; in the power supply circuit, the chip U2 is connected with the +12V power supply to supply power to the internal and related capacitor and inductor, and ensure the stable operation of each circuit; the direct current sampling circuit collects the output voltage through the chip U1 and related resistors, analyzes the current change and monitors the voltage, so as to adjust the converter. After the driving circuit receives the control signal through the chip U1, the current is limited through the resistor R16, and the light coupling driving circuit is output from the 1Y pin and the like, the light coupling circuit chip inputs the current through the AN pin, processes internally and outputs from the CAT pin, and through the transformer isolation conversion, the switching elements of the inverter and the rectifier circuit are accurately controlled; the light emitting diodes LED1 and LED2 of the power supply circuit are connected with the +12V and +5V power supplies through the resistors R19 and R20 respectively, and emit light to indicate the power supply state when normally powered.

[0049] The utility model covers any alternative, modification, equivalent method and scheme which are made on the essence and range of the utility model. In order to make the public have the thorough understanding of the utility model, the specific details are explained in the above preferred embodiment of the utility model, and the utility model can also be completely understood without the description of these details for the person skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the utility model, the well-known method, process, flow, element and circuit etc. are not explained in detail.

[0050] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled person in the art, under the premise of not departing from the principle of the utility model, a plurality of improvements and refinements can also be made, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. A multi-output DC\AC\DC converter comprising a boost circuit, a full-bridge inverter circuit and a full-bridge controllable rectifier circuit, characterized in that: The Boost circuit, the input end is connected with the output end of the hydrogen fuel cell, is used for raising the unstable direct current low voltage output by the hydrogen fuel cell to the stable voltage level; The Boost circuit includes an inductor, a capacitor C1, a diode D1 and a switch Q1, one end of the inductor is connected with the positive pole of the direct current power supply, the other end is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the positive pole of the capacitor C1, the negative pole of the capacitor C1 is connected with the negative pole of the direct current power supply, the drain of the switch Q1 is connected at the other end of the inductor, and the source is connected at the negative pole of the direct current power supply; The full-bridge inverter circuit, the input end is connected with the output end of the Boost circuit, is used for converting the boosted direct current voltage into alternating current voltage; The full-bridge controllable rectifier circuit, the input end is connected with the output end of the full-bridge inverter circuit, rectifies, filters and electrically isolates the alternating current voltage, changes the duty cycle to control the output stable direct current voltage, and provides the power supply suitable for the unmanned aerial vehicle.

2. The multi-output DC\AC\DC converter according to claim 1, wherein, The full-bridge inverter circuit includes two Q3, Q4 and Q5, the source of the first Q3 is connected with the negative pole of the capacitor C1, the drain is connected with the source of the second Q3, the drain of the second Q3 is connected with the positive pole of the capacitor C1, the drain of the Q4 is connected with the positive pole of the capacitor C1, the source is connected with the drain of Q5, and the source of Q5 is connected with the negative pole of the capacitor C1.

3. The multi-output DC\AC\DC converter according to claim 1, wherein, The full-bridge controllable rectifier circuit includes a plurality of transformers SW1, a plurality of switches Q3, a switch Q2, a switch Q4 and a switch Q5, the pin 1 of the first transformer SW1 is connected between two switches Q3 in the full-bridge inverter circuit, the pin 2 is connected with the pin 1 of the second transformer SW1, the pin 2 of the second transformer SW1 is connected with the pin 1 of the third transformer SW1, and so on, the pin 2 of the last transformer SW1 is connected between two switches Q4 and Q5 in the full-bridge inverter circuit, the pin 3 of each transformer is connected with the source of the switch Q2 and the switch Q4 in the full-bridge controllable rectifier circuit, and the pin 4 is connected with the drain of the switch Q3 and the switch Q5 in the full-bridge controllable rectifier circuit, so as to realize the output of different voltage levels and power.

4. The multiple output DC\AC\DC converter according to claim 1, wherein, The full-bridge controllable rectifier circuit further includes a capacitor C2 and a resistor R5, the two ends of the capacitor C2 are connected with the two ends of the resistor R5 respectively, one end of the resistor R5 is connected between the switch Q3 and the switch Q2 in the full-bridge controllable rectifier circuit, and the other end is connected between the switch Q4 and the switch Q5 in the full-bridge controllable rectifier circuit, so as to realize the output of different voltage levels and power.

5. The multiple output DC\AC\DC converter according to claim 1, wherein, Further comprising: The power supply circuit comprises a chip U2, capacitors C5, C6, C7, C8, an inductor L2 and a diode D8, a VIN pin of the chip U2 is connected with DC1, and a +12V direct current power supply is connected with the VIN pin, an OUTPUT pin of the chip U2 is connected with the VIN pin, a GND pin is connected with an ON / OFF pin, an FB pin is connected with an anode of the diode D8, a cathode of the diode D8 is connected with the VIN pin, a positive pole of the capacitor C5 is connected with the VIN pin, a negative pole is connected with the ON / OFF pin, one end of the capacitor C7 is connected with the VIN pin, the other end is connected with the ON / OFF pin, and the ON / OFF pin is grounded, one end of the inductor L2 is connected with the cathode of D8, the other end is connected with the FB pin, a positive pole of the capacitor C6 is connected with the other end of the inductor L1, a negative pole is connected with the FB pin, one end of the capacitor C8 is connected with the other end of the inductor L1, the other end is connected with the FB pin, so as to realize power supply for the Boost circuit, the full-bridge inverter circuit and the full-bridge controllable rectifier circuit.

6. The multiple output DC\AC\DC converter according to claim 1, wherein, Further comprising: The direct current sampling circuit comprises a chip U1, resistors R12, R13, R15, R61, a diode D7 and capacitors C3, C4, the chip U1 is connected with the resistors R12 between an OUT1 pin and an -IN1 pin, the OUT1 pin is connected with a +IN2 pin, the -IN1 pin is connected with the resistors R13, R12 on the same node, and the other end of the resistor R13 is grounded, and the +IN1 pin is connected with the resistors R15, R61 on the same node, the other end of the resistor R15 is grounded and connected with a VEE pin, the other end of the resistor R61 is connected with an output voltage VOUT, a VCC pin of the chip U1 is connected with a +5V power supply, the OUT2 pin is connected with a negative pole of the diode D7, and the positive pole of the diode D7 is connected with the VEE pin, the capacitors C3 and C4 are connected in parallel, one end of the capacitors C3 and C4 is connected with the VCC pin, and the other end is connected with the VEE pin.

7. The multiple output DC\AC\DC converter according to claim 1, wherein, Further comprising: The driving circuit comprises a chip U1, a plurality of resistors R16 and a plurality of optocoupler driving circuits, the plurality of resistors R16 are respectively connected on 1A, 2A...11A pins in the chip U1, the other end of the resistor R16 is grounded, and the plurality of optocoupler driving circuits are respectively connected on 1Y, 2Y...11Y pins in the chip U1, so as to realize accurate control of the full-bridge inverter circuit and the full-bridge controllable rectifier circuit.

8. The multiple output DC\AC\DC converter according to claim 5, characterized in that: Two light emitting diodes LED1 and LED2 are further arranged in the power supply circuit, resistors R19 and R20 are respectively connected on the positive poles of the two light emitting diodes LED1 and LED2, the other end of the resistor R19 is connected with a +12V power supply, the other end of the resistor R20 is connected with a +5V power supply, and the cathodes of the light emitting diodes LED1 and LED2 are grounded.

9. The multiple output DC\AC\DC converter according to claim 7, characterized in that: The light coupling driving circuit comprises a chip, a capacitor and a resistor, an AN pin of the chip is connected with one end of the resistor, the other end of the resistor is connected with a +5V power supply, the capacitor is connected in series between a VCC pin and a GND pin, the VCC pin is connected with a +12V power supply, a CAT pin in the chip is connected with a 1Y pin of a chip U1 in the driving circuit, and two VO pins in the chip are connected with a transformer.

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