Multipath output power supply system with power-off holding function

Abstract

The invention discloses a multi-path output power supply system with a power-off maintaining function, and the system carries out the filtering, reverse connection prevention, surge protection and voltage conversion processing of an input power supply through a first power supply processing branch, a second power supply processing branch and a power supply output branch when the input power supply normally supplies power. When the input power supply is interrupted or the voltage value of the input power supply is lower than a preset threshold value, the first power supply processing branch circuit outputs multiple paths of output power supplies with different voltages and powers to supply power to a load, and energy storage is carried out through the boost energy storage circuit of the second power supply processing branch circuit. If the input power supply is cut off, the stored energy is output as an energy storage power supply through a boost energy storage circuit of the second power supply processing branch, and finally the energy storage power supply is subjected to voltage conversion processing through the power supply output branch so as to output an output power supply, so that when the input power supply is cut off, the multi-path output power supply system can still work normally with load; and interruption or voltage fluctuation does not occur.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a multi-channel output power supply system with a power-off retention function. Background Art

[0002] With the development of science and technology, power supply systems not only need to meet basic output power requirements, but also need to continuously improve efficiency, stability, safety and intelligence, and have a variety of power circuit protection functions to adapt to the ever-changing application scenarios and user needs. In addition, with the advent of the information and intelligent era, many electronic devices have been widely used in people's daily lives and many fields of production activities, and the normal operation of electronic devices depends on the continuous and stable power supply of the power supply system.

[0003] However, when the input voltage is disconnected, the output voltage of the existing power supply system will also be turned off, which may cause the loss of transmitted data or even equipment failure, thus affecting people's work and life. Therefore, there is an urgent need for a power supply system that can maintain power supply after the input power is disconnected without interruption or voltage fluctuation of the output voltage. Summary of the invention

[0004] The present invention provides a multi-channel output power supply system with a power-off holding function to solve the above technical problems. When the input power is disconnected, the multi-channel output power supply system can still work normally with load without interruption or voltage fluctuation.

[0005] In order to solve the above technical problems, the present invention provides a multi-output power supply system with a power-off retention function, comprising: a first power processing branch, a second power processing branch and a power output branch;

[0006] The first power processing branch includes a first input filter circuit and a first surge protection circuit;

[0007] The second power processing branch includes a second input filter circuit, a second surge protection circuit, and a boost energy storage circuit;

[0008] The input end of the first input filter circuit serves as the input end of the first power supply processing branch; the first input filter circuit is used to filter and absorb peaks of the input power supply to output a first filtered power supply;

[0009] The first surge protection circuit serves as the output end of the first power processing branch; the first surge protection circuit is used to protect the first filtered power supply from reverse connection, voltage surge and current surge, so as to output the first power supply;

[0010] The input end of the second input filter circuit serves as the input end of the second power supply processing branch; the second input filter circuit is used to filter and absorb peaks of the input power supply to output a second filtered power supply;

[0011] The output end of the second surge protection circuit serves as the first output end of the second power processing branch; the second surge protection circuit is used to perform reverse connection protection, voltage surge protection and current surge protection on the second filtered power supply to output a second power supply;

[0012] The output end of the boost energy storage circuit serves as the second output end of the second power processing branch; the boost energy storage circuit is used to perform a boost process on the second power supply to output a boosted power supply; the boost energy storage circuit is also used to store energy based on the boosted power supply to obtain stored energy, and when the input power supply is interrupted or the input power supply voltage value is lower than a preset threshold, output the energy storage power supply based on the stored energy;

[0013] The power output branch is used to perform voltage conversion processing on the first power supply, the second power supply or the energy storage power supply to output multiple output power supplies with different voltages and powers.

[0014] The beneficial effects of the present invention are:

[0015] The multi-channel output power supply system of the present invention filters, prevents reverse connection, performs surge protection and voltage conversion processing on the input power supply through the first power supply processing branch, the second power supply processing branch and the power supply output branch when the input power supply is normally supplied, outputs multiple output power supplies with different voltages and powers to supply power to the load, and stores energy through the boost energy storage circuit of the second power supply processing branch. When the input power supply is interrupted or the input power supply voltage value is lower than a preset threshold, the stored energy is output as energy storage power through the boost energy storage circuit of the second power supply processing branch, and finally the energy storage power is subjected to voltage conversion processing through the power supply output branch to output the output power. Therefore, the present invention realizes the technical purpose that when the input power supply is disconnected, the multi-channel output power supply system can still work normally with load without interruption or voltage fluctuation.

[0016] The present invention performs filtering processing, peak absorption processing, reverse connection protection, voltage surge protection and current surge protection on the input power supply through an input filtering circuit and a surge protection circuit, and can eliminate various interference signals in the input power supply to reduce the interference between the input power supply and the multi-channel output power supply system. When the input power supply is reversely connected, the components of the power supply system can be protected from damage, and the high voltage and high current interference of the input power supply can be suppressed, so as to stabilize the voltage of the output power supply, reduce voltage fluctuations, ensure a more reliable working state of the output power supply, improve the quality and stability of the output power supply, and thus improve the working efficiency, overall performance and reliability of the electrical equipment.

[0017] As a preferred solution, the circuit composition and circuit structure of the first input filter circuit and the second input filter circuit are the same, and the second input filter circuit includes: a TVS tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first inductor, a second inductor and a common mode inductor;

[0018] The first end of the TVS tube, the first end of the first capacitor and the first end of the common mode inductor serve as the input end of the second input filter circuit;

[0019] The second end of the second inductor, the first end of the seventh capacitor, the first end of the eighth capacitor and the first end of the ninth capacitor serve as the output end of the second input filter circuit;

[0020] The third end of the common mode inductor is electrically connected to the first end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor and the first end of the first inductor;

[0021] The fourth end of the common mode inductor is electrically connected to the second end of the third capacitor, the first end of the fifth capacitor, the first end of the sixth capacitor and the first end of the second inductor;

[0022] A first end of the first capacitor, a second end of the second capacitor, a first end of the third capacitor, and a second end of the fourth capacitor are connected to a ground line;

[0023] The first end of the second capacitor, the second end of the TVS tube, the second end of the common mode inductor, the second end of the first inductor, the second end of the seventh capacitor, the second end of the eighth capacitor and the second end of the ninth capacitor are grounded.

[0024] As a preferred solution, the first surge protection circuit and the second surge protection circuit have the same circuit composition and circuit structure, and the second surge protection circuit includes: an anti-reverse connection sub-circuit, a voltage surge protection sub-circuit and a current surge protection sub-circuit;

[0025] The input end of the anti-reverse connection sub-circuit serves as the input end of the second surge protection circuit;

[0026] The first output end of the anti-reverse connection sub-circuit is electrically connected to the first input end of the voltage surge protection sub-circuit, and the second output end of the anti-reverse connection sub-circuit is electrically connected to the second input end of the voltage surge protection sub-circuit;

[0027] The output end of the voltage surge protection subcircuit is electrically connected to the input end of the current surge protection subcircuit;

[0028] The output end of the current surge protection subcircuit serves as the output end of the second surge protection circuit to output the second power supply;

[0029] The anti-reverse connection sub-circuit is used to disconnect the input power supply when the positive and negative poles of the input power supply are connected in reverse;

[0030] The voltage surge protection subcircuit is used to perform voltage surge protection on the second filter power supply;

[0031] The current surge protection subcircuit is used to perform current surge protection on the second filter power supply.

[0032] As a preferred solution, the anti-reverse connection sub-circuit includes: an auxiliary source generation module, a first MOS transistor, a second MOS transistor, a first triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode;

[0033] The anode of the first diode, the source of the first MOS tube, the source of the second MOS tube and the emitter of the first transistor serve as the input end of the anti-reverse connection sub-circuit;

[0034] The drain of the first MOS tube, the drain of the second MOS tube and the input end of the auxiliary source generating module serve as the first output end of the anti-reverse connection sub-circuit; the second end of the fourth resistor and the output end of the auxiliary source generating module serve as the second output end of the anti-reverse connection sub-circuit;

[0035] The cathode of the first diode is electrically connected to the first end of the first resistor and the base of the first transistor;

[0036] The collector of the first triode is electrically connected to the cathode of the second diode;

[0037] The anode of the second diode is electrically connected to the second end of the second resistor, the second end of the third resistor and the first end of the fourth resistor;

[0038] A first end of the second resistor is electrically connected to the gate of the first MOS tube;

[0039] A first end of the third resistor is electrically connected to the gate of the second MOS tube;

[0040] A second terminal of the first resistor is grounded.

[0041] As a preferred solution, the auxiliary source generation module includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a first voltage-stabilizing diode, a second voltage-stabilizing diode, a third diode, a fourth diode, a second triode, a third triode, a fourth triode, a fifth triode and an auxiliary source generation chip;

[0042] The first end of the fifth resistor, the cathode of the second voltage-stabilizing diode, the first end of the eighth resistor, the first end of the eleventh capacitor, the first end of the ninth resistor, the first end of the tenth resistor, the anode of the third diode, the first end of the thirteenth capacitor, the first end of the thirteenth resistor and the eighth pin of the auxiliary source generating chip serve as the input end of the auxiliary source generating module;

[0043] The collector of the fifth triode serves as the output end of the auxiliary source generation module;

[0044] The second end of the fifth resistor is electrically connected to the first end of the tenth capacitor, the cathode of the first voltage-stabilizing diode and the base of the second transistor;

[0045] The anode of the second voltage stabilizing stage is electrically connected to the collector of the second triode and the base of the fourth triode;

[0046] The emitter of the second triode is electrically connected to the first end of the sixth resistor;

[0047] The second end of the sixth resistor is electrically connected to the first end of the seventh resistor and the base of the third transistor;

[0048] The second end of the eighth resistor is electrically connected to the collector of the third triode;

[0049] The second end of the eleventh capacitor is electrically connected to the second end of the ninth resistor, the emitter of the fourth transistor, the second end of the eleventh resistor, the fifth pin of the auxiliary source generating chip, the third pin of the auxiliary source generating chip and the second end of the fourteenth capacitor;

[0050] A first end of the fourteenth capacitor is electrically connected to the seventh pin of the auxiliary source generating chip;

[0051] The second end of the tenth resistor is electrically connected to the sixth pin of the auxiliary source generating chip and the first end of the eleventh resistor;

[0052] The cathode of the third diode is electrically connected to the second end of the twelfth capacitor and the anode of the fourth diode;

[0053] A first end of the twelfth capacitor is electrically connected to a second pin of the auxiliary source generating chip;

[0054] The second end of the thirteenth capacitor is electrically connected to the cathode of the fourth diode, the first end of the twelfth resistor and the emitter of the fifth transistor;

[0055] The second end of the thirteenth resistor is electrically connected to the second end of the twelfth resistor and the base of the fifth transistor;

[0056] The first pin, the fourth pin and the ninth pin of the auxiliary source generating chip are left floating;

[0057] The second end of the tenth capacitor, the anode of the first voltage-stabilizing diode, the second end of the seventh resistor, the emitter of the third transistor and the collector of the fourth transistor are grounded.

[0058] As a preferred solution, the voltage surge protection subcircuit includes: a third voltage zener diode, a fourth voltage zener diode, a fifth voltage zener diode, a sixth voltage zener diode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a third MOS tube, a fourth MOS tube, a sixth triode and a seventh triode;

[0059] The drain of the third MOS tube and the drain of the fourth MOS tube serve as the first input terminal of the voltage surge protection sub-circuit;

[0060] The cathode of the third voltage stabilizing diode and the first end of the fourteenth resistor serve as the second input end of the voltage surge protection subcircuit;

[0061] The source of the third MOS tube, the source of the fourth MOS tube, the first end of the twentieth resistor, the first end of the twenty-third resistor, the cathode of the sixth voltage zener diode, the first end of the nineteenth capacitor, the first end of the twenty-fifth resistor and the first end of the twenty-sixth resistor serve as the output end of the voltage surge protection sub-circuit;

[0062] The second end of the fourteenth resistor is electrically connected to the first end of the fifteenth resistor;

[0063] The gate of the third MOS tube is electrically connected to the first end of the sixteenth resistor and the first end of the fifteenth capacitor;

[0064] The gate of the fourth MOS tube is electrically connected to the first end of the seventeenth resistor and the first end of the sixteenth capacitor;

[0065] The second end of the sixteenth resistor is electrically connected to the second end of the fifteenth resistor, the second end of the fifteenth capacitor, the second end of the seventeenth resistor, the second end of the sixteenth capacitor, the first end of the eighteenth resistor and the cathode of the fourth zener diode;

[0066] The second end of the eighteenth resistor is electrically connected to the anode of the fourth voltage stabilizing diode, the first end of the seventeenth capacitor, the first end of the nineteenth resistor and the collector of the sixth transistor;

[0067] The second end of the twentieth resistor is electrically connected to the base of the sixth transistor, the first end of the twenty-first resistor and the first end of the twenty-second resistor;

[0068] The emitter of the sixth transistor is electrically connected to the first end of the eighteenth capacitor, the cathode of the fifth voltage stabilizing diode 5 and the collector of the seventh transistor;

[0069] A second end of the twenty-third resistor is electrically connected to the emitter of the seventh transistor;

[0070] An anode of the sixth voltage stabilizing diode is electrically connected to a base of the seventh transistor and a first end of the twenty-fourth resistor;

[0071] The second end of the seventeenth capacitor, the second end of the nineteenth resistor, the second end of the eighteenth capacitor, the anode of the fifth Zener diode, the second end of the twenty-fourth resistor, the second end of the nineteenth capacitor, the second end of the twenty-fifth resistor, the second end of the twenty-sixth resistor, the second end of the twenty-first resistor and the second end of the twenty-second resistor are grounded.

[0072] As a preferred embodiment, the multi-output power supply system with a power-off holding function further includes: a power supply system monitoring circuit; the power supply system monitoring circuit includes an MCU control module and an auxiliary power supply circuit; the input end of the auxiliary power supply circuit is electrically connected to the output end of the voltage surge protection subcircuit, and the auxiliary power supply circuit is used to output a low-voltage power supply to power the MCU control module; the MCU control module is used to receive operating data of the multi-output power supply system and output a control signal according to the operating data; the operating data includes output power status data, output power current data, temperature data and input voltage data.

[0073] As a preferred solution, the current surge protection sub-circuit includes: a first coupler, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a twentieth capacitor, a twenty-first capacitor, a seventh voltage zener diode, an eighth transistor, a fifth MOS transistor, a sixth MOS transistor and a seventh MOS transistor;

[0074] The first end of the twenty-seventh resistor, the first end of the twenty-eighth resistor, and the first end of the twentieth capacitor serve as an input end and an output end of the current surge protection sub-circuit;

[0075] The second end of the twenty-seventh resistor is electrically connected to the second end of the twenty-eighth resistor and the first end of the first coupler;

[0076] The second end of the first coupler is electrically connected to the cathode of the seventh zener diode, the first end of the twenty-ninth resistor, the first end of the twenty-first capacitor, the first end of the thirtieth resistor, the first end of the thirty-first resistor and the first end of the thirty-second resistor;

[0077] A second end of the 30th resistor is electrically connected to the gate of the fifth MOS tube;

[0078] A second end of the thirty-first resistor is electrically connected to the gate of the sixth MOS tube;

[0079] A second end of the thirty-second resistor is electrically connected to the gate of the seventh MOS tube;

[0080] The third end of the first coupler is electrically connected to the first end of the thirty-seventh resistor;

[0081] A second end of the thirty-seventh resistor is electrically connected to the low voltage power supply;

[0082] The fourth end of the first coupler is electrically connected to the collector of the eighth transistor;

[0083] The base of the eighth transistor is electrically connected to the first end of the thirty-fifth resistor and the first end of the thirty-sixth resistor;

[0084] A second end of the thirty-sixth resistor is electrically connected to the MCU control module;

[0085] The second end of the twentieth capacitor, the anode of the seventh zener diode, the second end of the twenty-ninth resistor, the second end of the twenty-first capacitor, the source of the fifth MOS tube, the source of the sixth MOS tube, the source of the seventh MOS tube, the drain of the fifth MOS tube, the drain of the sixth MOS tube, the drain of the seventh MOS tube, the first end of the thirty-third resistor, the first end of the thirty-fourth resistor, the second end of the thirty-third resistor, the second end of the thirty-fourth resistor, the emitter of the eighth transistor and the second end of the thirty-fifth resistor are grounded.

[0086] As a preferred solution, the boost energy storage circuit comprises: a boost energy storage subcircuit, an input voltage detection subcircuit and an energy storage discharge control subcircuit;

[0087] The input end of the boost energy storage subcircuit serves as the input end of the boost energy storage circuit;

[0088] The output end of the energy storage discharge control subcircuit serves as the output end of the boost energy storage circuit;

[0089] The output end of the boost energy storage subcircuit is electrically connected to the input end of the energy storage discharge control subcircuit;

[0090] The input end of the input voltage detection subcircuit is electrically connected to the output end of the voltage surge protection subcircuit; the output end of the input voltage detection subcircuit is electrically connected to the control end of the energy storage discharge control subcircuit;

[0091] The boost energy storage subcircuit is used to boost the second power supply to output a boosted power supply; the boost energy storage subcircuit is also used to store energy based on the boosted power supply to obtain stored energy;

[0092] The input voltage detection subcircuit is used to determine whether the input power supply is interrupted or whether the input power supply voltage value is lower than a preset threshold;

[0093] The energy storage discharge control subcircuit is used to output energy storage power based on stored energy when the boost energy storage subcircuit determines that the input power is interrupted or the input power voltage value is lower than a preset threshold.

[0094] As a preferred solution, the boost energy storage subcircuit includes: a flyback chip, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a third inductor, a fifth diode, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor and a thirtieth capacitor; the fortieth resistor is a power resistor, the twenty-ninth capacitor and the thirtieth capacitor are large capacitors; the twenty-ninth capacitor and the thirtieth capacitor are used to store energy based on the boost power supply to obtain stored energy;

[0095] The first end of the third inductor and the first end of the twenty-second capacitor serve as input ends of the boost energy storage sub-circuit;

[0096] The second end of the 40th resistor, the positive electrode of the 29th capacitor and the positive electrode of the 30th capacitor serve as output ends of the boost energy storage sub-circuit;

[0097] The second end of the third inductor is electrically connected to the first end of the twenty-third capacitor, the first end of the twenty-fourth capacitor, the second end of the twenty-fifth capacitor and the first pin of the flyback chip;

[0098] The fifth pin of the flyback chip is electrically connected to the second end of the thirty-eighth resistor and the first end of the thirty-ninth resistor;

[0099] The sixth pin of the flyback chip is electrically connected to the first end of the thirty-eighth resistor, the first end of the twenty-seventh capacitor, the first end of the twenty-eighth capacitor and the anode of the fifth diode;

[0100] A cathode of the fifth diode is electrically connected to the first end of the fortieth resistor;

[0101] The third pin of the flyback chip is left floating;

[0102] A first end of the twenty-fifth capacitor and a second end of the twenty-sixth capacitor are connected to the ground line;

[0103] The second end of the twenty-second capacitor, the second end of the twenty-third capacitor, the second end of the twenty-fourth capacitor, the first end of the twenty-sixth capacitor, the second pin of the flyback chip, the fourth pin of the flyback chip, the second end of the thirty-ninth resistor, the second end of the twenty-seventh capacitor, the second end of the twenty-eighth capacitor, the negative electrode of the twenty-ninth capacitor and the negative electrode of the thirtieth capacitor are grounded.

[0104] As a preferred solution, the energy storage discharge control subcircuit includes: a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a forty-fifth resistor, a second coupler, an eighth MOS transistor, a ninth MOS transistor, a tenth MOS transistor, an eighth voltage regulator diode, a thirty-first capacitor and an ideal diode controller chip;

[0105] The source of the eighth MOS tube, the source of the ninth MOS tube and the fourth pin of the ideal diode controller chip serve as input terminals of the energy storage discharge control subcircuit;

[0106] The drain of the tenth MOS tube serves as the output end of the energy storage discharge control subcircuit;

[0107] The second end of the second coupler serves as a control end of the energy storage discharge control subcircuit;

[0108] The gate of the eighth MOS tube is electrically connected to the first end of the forty-first resistor;

[0109] The gate of the ninth MOS tube is electrically connected to the first end of the forty-second resistor;

[0110] The fifth pin of the ideal diode controller chip is electrically connected to the second end of the forty-first resistor and the second end of the forty-second resistor;

[0111] The drain of the eighth MOS tube is electrically connected to the drain of the ninth MOS tube, the sixth pin of the ideal diode controller chip, the first end of the forty-fourth resistor, the cathode of the eighth voltage stabilizing diode, the first end of the thirty-first capacitor and the source of the tenth MOS tube;

[0112] The first end of the forty-fifth resistor is electrically connected to the second end of the forty-fourth resistor, the anode of the eighth voltage-stabilizing diode, the second end of the thirty-first capacitor, and the gate of the tenth MOS tube;

[0113] The second end of the forty-fifth resistor is electrically connected to the third end of the second coupler;

[0114] The first end of the second coupler is electrically connected to the second end of the forty-third resistor;

[0115] A first end of the forty-third resistor is electrically connected to a low voltage power supply;

[0116] The first and third pins of the ideal diode controller chip are left floating;

[0117] The second pin of the ideal diode controller chip and the fourth end of the second coupler are grounded.

[0118] As a preferred solution, the input voltage detection subcircuit includes: a forty-sixth resistor, a forty-seventh resistor, a forty-eighth resistor, a forty-ninth resistor, a fiftieth resistor, a fifty-first resistor, a fifty-second resistor, a fifty-third resistor, a fifty-fourth resistor, a fifty-fifth resistor, a fifty-sixth resistor, a thirty-second capacitor, a ninth transistor, a third coupler, a fourth coupler and a voltage reference chip;

[0119] a first end of the forty-sixth resistor, a first end of the forty-seventh resistor, a first end of the fiftieth resistor, a first end of the fifty-first resistor, and a first end of the fifty-second resistor as an input end of the input voltage detection sub-circuit;

[0120] The collector of the ninth transistor serves as the output terminal of the input voltage detection subcircuit;

[0121] The second end of the forty-sixth resistor is electrically connected to the second end of the forty-seventh resistor, the first end of the forty-eighth resistor, the first end of the forty-ninth resistor, the first end of the thirty-second capacitor, and the first pin of the voltage reference chip;

[0122] The second end of the fiftieth resistor is electrically connected to the second pin of the voltage reference chip and the second end of the fourth coupler;

[0123] The second end of the fifty-first resistor is electrically connected to the second end of the fifty-second resistor and the first end of the third coupler;

[0124] The second end of the third coupler is electrically connected to the first end of the fourth coupler;

[0125] The third end of the third coupler is electrically connected to the second end of the fifty-third resistor and the first end of the fifty-fourth resistor;

[0126] The second end of the fifty-fourth resistor is electrically connected to the first end of the fifty-sixth resistor and the base of the ninth transistor;

[0127] A first end of the fifty-third resistor and a second end of the fifty-fifth resistor are connected to a low voltage power supply;

[0128] The third end of the fourth coupler is electrically connected to the MCU control module and the first end of the fifty-fifth resistor;

[0129] The second end of the forty-eighth resistor, the second end of the forty-ninth resistor, the second end of the thirty-second capacitor, the third pin of the voltage reference chip, the fourth end of the third coupler, the fourth end of the fourth coupler, the second end of the fifty-sixth resistor and the emitter of the ninth transistor are grounded.

[0130] As a preferred solution, the power system monitoring circuit further includes a current acquisition module; the current acquisition module is used to collect output power current data of the output power supply and output the output power current data; the current acquisition module includes: a current acquisition chip, a multi-capacitor parallel module, an RC parallel module, a thirty-third capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a fifty-seventh resistor and a fifty-eighth resistor;

[0131] The first pin of the current acquisition chip, the second pin of the current acquisition chip and the first end of the multi-capacitor parallel module are electrically connected to the first output power supply;

[0132] The third pin of the current collection chip, the fourth pin of the current collection chip and the first end of the RC parallel module are electrically connected to the second output power supply;

[0133] The second end of the thirty-fifth capacitor, the first end of the fifty-seventh resistor, and the first end of the fifty-eighth resistor serve as the output end of the current acquisition module;

[0134] The eighth pin of the current acquisition chip and the first end of the thirty-third capacitor are connected to a low-voltage power supply;

[0135] The seventh pin of the current collection chip is electrically connected to the first end of the fifty-seventh resistor;

[0136] The sixth pin of the current collection chip is electrically connected to the first end of the thirty-fourth capacitor;

[0137] The second end of the multi-capacitor parallel module, the second end of the RC parallel module, the second end of the thirty-third capacitor, the second end of the thirty-fourth capacitor, the second end of the thirty-fifth capacitor, the second end of the fifty-eighth resistor and the fifth pin of the current acquisition chip are grounded.

[0138] As a preferred solution, the power system monitoring circuit further includes a temperature acquisition module; the temperature acquisition module is used to collect the temperatures of multiple output power supplies with different voltages and powers, and output temperature data, so that the MCU control module outputs a conversion control signal based on the temperature data, and controls the power output branch based on the conversion control signal;

[0139] The temperature acquisition module includes: a thermistor, a current limiting resistor and a filter capacitor;

[0140] The first end of the thermistor, the second end of the current limiting resistor and the first end of the filter capacitor serve as the output end of the temperature acquisition module;

[0141] A first end of the current limiting resistor is connected to a low voltage power supply;

[0142] A second terminal of the thermistor and a second terminal of the filter capacitor are grounded.

[0143] As a preferred solution, the multi-channel output power supply system with power-off holding function further includes an output filter circuit, the output filter circuit is used to filter out the high-frequency component of the output power supply; the output filter circuit includes: a thirty-sixth capacitor, a thirty-seventh capacitor and a fourth inductor;

[0144] The first end of the fourth inductor and the first end of the thirty-sixth capacitor serve as input ends of the output filter circuit;

[0145] The second end of the fourth inductor and the first end of the thirty-seventh capacitor serve as an output end of the output filter circuit;

[0146] A second end of the thirty-sixth capacitor and a second end of the thirty-seventh capacitor are grounded.

[0147] As a preferred solution, the power output branch includes a plurality of power conversion modules;

[0148] The first power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply to output a first output power supply with a first preset voltage and a first preset power;

[0149] The second power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply to output a second output power supply with a second preset voltage and a second preset power;

[0150] The third power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply, and output a third output power supply with a third preset voltage and a third preset power;

[0151] The fourth power conversion module is used to perform voltage conversion processing on the first power supply to output a fourth output power supply with a fourth preset voltage and a fourth preset power. BRIEF DESCRIPTION OF THE DRAWINGS

[0152] Figure 1 : A structural schematic diagram of an embodiment of a multi-channel output power supply system with a power-off retention function provided by the present invention;

[0153] Figure 2 : A circuit diagram of an embodiment of a second input filter circuit provided by the present invention;

[0154] Figure 3 : A circuit diagram of an embodiment of the anti-reverse connection sub-circuit and the voltage surge protection sub-circuit provided by the present invention;

[0155] Figure 4 : A circuit diagram of an embodiment of the auxiliary source generating module provided by the present invention;

[0156] Figure 5 : A circuit diagram of an embodiment of a current surge protection subcircuit provided by the present invention;

[0157] Figure 6 : A circuit diagram of an embodiment of a boost energy storage subcircuit provided by the present invention;

[0158] Figure 7 : A circuit diagram of an embodiment of the energy storage and discharge control subcircuit provided by the present invention;

[0159] Figure 8 : A circuit diagram of an embodiment of an input voltage detection subcircuit provided by the present invention;

[0160] Fig. 9 : A circuit diagram of an embodiment of a current acquisition module provided by the present invention;

[0161] Fig.10 : A circuit diagram of an embodiment of a temperature acquisition module provided by the present invention;

[0162] Fig.11 : A circuit diagram of an embodiment of an output filter circuit provided by the present invention;

[0163] Fig.12 : A structural schematic diagram of another embodiment of a multi-output power supply system with a power-off retention function provided by the present invention. DETAILED DESCRIPTION

[0164] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0165] Embodiment 1

[0166] Please refer to Figure 1 , which is a structural schematic diagram of an embodiment of a multi-output power supply system with a power-off retention function provided by the present invention.

[0167] like Figure 1 As shown, the multi-output power supply system with power-off retention function comprises: a first power processing branch, a second power processing branch and a power output branch;

[0168] The first power processing branch includes a first input filter circuit and a first surge protection circuit;

[0169] The second power processing branch includes a second input filter circuit, a second surge protection circuit, and a boost energy storage circuit;

[0170] The input end of the first input filter circuit serves as the input end of the first power supply processing branch; the first input filter circuit is used to filter and absorb peaks of the input power supply to output a first filtered power supply;

[0171] The first surge protection circuit serves as the output end of the first power processing branch; the first surge protection circuit is used to protect the first filtered power supply from reverse connection, voltage surge and current surge, so as to output the first power supply;

[0172] The input end of the second input filter circuit serves as the input end of the second power supply processing branch; the second input filter circuit is used to filter and absorb peaks of the input power supply to output a second filtered power supply;

[0173] The output end of the second surge protection circuit serves as the first output end of the second power processing branch; the second surge protection circuit is used to perform reverse connection protection, voltage surge protection and current surge protection on the second filtered power supply to output a second power supply;

[0174] The output end of the boost energy storage circuit serves as the second output end of the second power processing branch; the boost energy storage circuit is used to perform a boost process on the second power supply to output a boosted power supply; the boost energy storage circuit is also used to store energy based on the boosted power supply to obtain stored energy, and when the input power supply is interrupted or the input power supply voltage value is lower than a preset threshold, output the energy storage power supply based on the stored energy;

[0175] The power output branch is used to perform voltage conversion processing on the first power supply, the second power supply or the energy storage power supply to output multiple output power supplies with different voltages and powers.

[0176] In this embodiment, the voltage range of the input power supply is not limited to 18V to 36V.

[0177] Please refer to the following Figure 2 , Figure 2 A circuit diagram of an embodiment of a second input filter circuit provided by the present invention.

[0178] Furthermore, the first input filter circuit and the second input filter circuit have the same circuit composition and circuit structure;

[0179] like Figure 2 As shown, the second input filter circuit includes: a TVS tube D31, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2 and a common mode inductor L0;

[0180] The first end of the TVS tube D31, the first end of the first capacitor C1 and the first end of the common mode inductor serve as the input end of the second input filter circuit;

[0181] The second end of the second inductor L2, the first end of the seventh capacitor C7, the first end of the eighth capacitor C8 and the first end of the ninth capacitor C9 serve as the output end of the second input filter circuit;

[0182] The third end of the common mode inductor L0 is electrically connected to the first end of the fourth capacitor C4, the second end of the fifth capacitor C5, the second end of the sixth capacitor C6 and the first end of the first inductor L1;

[0183] The fourth end of the common mode inductor L0 is electrically connected to the second end of the third capacitor C3, the first end of the fifth capacitor C5, the first end of the sixth capacitor C6 and the first end of the second inductor L2;

[0184] A first end of the first capacitor C1, a second end of the second capacitor C2, a first end of the third capacitor C3 and a second end of the fourth capacitor C4 are connected to a ground line;

[0185] A first end of the second capacitor C2, a second end of the TVS tube D31, a second end of the common mode inductor L0, a second end of the first inductor L1, a second end of the seventh capacitor C7, a second end of the eighth capacitor C8 and a second end of the ninth capacitor C9 are grounded.

[0186] exist Figure 2 In the embodiment, the output end of the input power supply is electrically connected to the pin 28V FJ; the first end and the second end of the common mode inductor L0 are the same-named ends.

[0187] In the present invention, the input end of the multi-channel output power supply system of the present invention is provided with a first input filter circuit and a second input filter circuit, the first input filter circuit and the second input filter circuit include components such as a common-mode inductor, a TVS tube and an LC filter composed of a capacitor and an inductor; the TVS tube, the common-mode inductor and the X capacitor together form a peak absorption circuit for absorbing a voltage spike of the uS level, and the LC filter can filter out ripples and noise in the input power supply to ensure the stability and reliability of the multi-channel output power supply system. The present invention can minimize the influence of the input source on the power supply through the first input filter circuit and the second input filter circuit, and at the same time reduce the interference of the power supply on the input source, thereby preventing the input power supply and the multi-channel output power supply system from interfering with each other.

[0188] Further, the first surge protection circuit and the second surge protection circuit have the same circuit composition and circuit structure, and the second surge protection circuit includes: an anti-reverse connection subcircuit, a voltage surge protection subcircuit and a current surge protection subcircuit;

[0189] The input end of the anti-reverse connection sub-circuit serves as the input end of the second surge protection circuit;

[0190] The first output end of the anti-reverse connection sub-circuit is electrically connected to the first input end of the voltage surge protection sub-circuit, and the second output end of the anti-reverse connection sub-circuit is electrically connected to the second input end of the voltage surge protection sub-circuit;

[0191] The output end of the voltage surge protection subcircuit is electrically connected to the input end of the current surge protection subcircuit;

[0192] The output end of the current surge protection subcircuit serves as the output end of the second surge protection circuit to output the second power supply;

[0193] The anti-reverse connection sub-circuit is used to disconnect the input power supply when the positive and negative poles of the input power supply are connected in reverse;

[0194] The voltage surge protection subcircuit is used to perform voltage surge protection on the second filter power supply;

[0195] The current surge protection subcircuit is used to perform current surge protection on the second filter power supply.

[0196] Please refer to the following Figure 3 , Figure 3 A circuit diagram of an embodiment of the anti-reverse connection sub-circuit and the voltage surge protection sub-circuit provided by the present invention.

[0197] Furthermore, if Figure 3 As shown, the anti-reverse connection sub-circuit includes: an auxiliary source generation module, a first MOS tube Q1, a second MOS tube Q2, a first triode Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode V1 and a second diode V2; the output end of the auxiliary source generation module outputs a DC auxiliary source;

[0198] The anode of the first diode V1, the source of the first MOS transistor Q1, the source of the second MOS transistor Q2 and the emitter of the first transistor Q3 serve as the input end of the anti-reverse connection sub-circuit;

[0199] The drain of the first MOS transistor Q1, the drain of the second MOS transistor Q2 and the input end of the auxiliary source generation module serve as the first output end of the anti-reverse connection sub-circuit; the second end of the fourth resistor R4 and the output end of the auxiliary source generation module serve as the second output end of the anti-reverse connection sub-circuit;

[0200] The cathode of the first diode V1 is electrically connected to the first end of the first resistor R1 and the base of the first transistor Q3;

[0201] The collector of the first transistor Q3 is electrically connected to the cathode of the second diode V2;

[0202] The anode of the second diode V2 is electrically connected to the second end of the second resistor R2, the second end of the third resistor R3 and the first end of the fourth resistor R4;

[0203] A first end of the second resistor R2 is electrically connected to the gate of the first MOS transistor Q1;

[0204] A first end of the third resistor R3 is electrically connected to the gate of the second MOS transistor Q2;

[0205] A second end of the first resistor R1 is grounded.

[0206] Please refer to the following Figure 4 , Figure 4 A circuit diagram of an embodiment of the auxiliary source generating module provided by the present invention.

[0207] Furthermore, if Figure 4 As shown, the auxiliary source generating module includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a first voltage-stabilizing diode D1, a second voltage-stabilizing diode D2, a third diode V3, a fourth diode V4, a second triode Q4, a third triode Q5, a fourth triode Q6, a fifth triode Q7 and an auxiliary source generating chip U22;

[0208] The first end of the fifth resistor R5, the cathode of the second voltage-stabilizing diode D2, the first end of the eighth resistor R8, the first end of the eleventh capacitor C11, the first end of the ninth resistor R9, the first end of the tenth resistor R10, the anode of the third diode V3, the first end of the thirteenth capacitor C13, the first end of the thirteenth resistor R13 and the eighth pin of the auxiliary source generating chip U22 serve as the input end of the auxiliary source generating module;

[0209] The collector of the fifth transistor Q7 serves as the output end of the auxiliary source generation module;

[0210] The second end of the fifth resistor R5 is electrically connected to the first end of the tenth capacitor C10, the cathode of the first voltage-stabilizing diode D1 and the base of the second transistor Q4;

[0211] The anode of the second voltage-stabilizing diode D2 is electrically connected to the collector of the second transistor Q4 and the base of the fourth transistor Q6;

[0212] The emitter of the second transistor Q4 is electrically connected to the first end of the sixth resistor R6;

[0213] The second end of the sixth resistor R6 is electrically connected to the first end of the seventh resistor R7 and the base of the third transistor Q5;

[0214] The second end of the eighth resistor R8 is electrically connected to the collector of the third transistor Q5;

[0215] The second end of the eleventh capacitor C11 is electrically connected to the second end of the ninth resistor R9, the emitter of the fourth transistor Q6, the second end of the eleventh resistor R11, the fifth pin of the auxiliary source generating chip U22, the third pin of the auxiliary source generating chip U22 and the second end of the fourteenth capacitor C14;

[0216] A first end of the fourteenth capacitor C14 is electrically connected to the seventh pin of the auxiliary source generating chip U22;

[0217] The second end of the tenth resistor R10 is electrically connected to the sixth pin of the auxiliary source generating chip U22 and the first end of the eleventh resistor R11;

[0218] The cathode of the third diode V3 is electrically connected to the second end of the twelfth capacitor C12 and the anode of the fourth diode V4;

[0219] A first end of the twelfth capacitor C12 is electrically connected to a second pin of the auxiliary source generating chip U22;

[0220] A second end of the thirteenth capacitor C13 is electrically connected to the cathode of the fourth diode V4, the first end of the twelfth resistor R12 and the emitter of the fifth transistor Q7;

[0221] A second end of the thirteenth resistor R13 is electrically connected to the second end of the twelfth resistor R12 and the base of the fifth transistor Q7;

[0222] The first pin, the fourth pin and the ninth pin of the auxiliary source generating chip U22 are left floating;

[0223] The second end of the tenth capacitor C10, the anode of the first voltage-stabilizing diode D1, the second end of the seventh resistor R7, the emitter of the third transistor Q5 and the collector of the fourth transistor Q6 are grounded.

[0224] In this embodiment, the model of the auxiliary source generating chip U22 is SGM3209YTDE8G / TR.

[0225] In this embodiment, the first MOS transistor Q1 and the second MOS transistor Q2 are NMS transistors.

[0226] In this embodiment, if Figure 3 and Figure 4 As shown, pin +VB is the input end of the auxiliary source generation module, pin DRV is the output end of the auxiliary source generation module, and pin 28V2 is the output end of the voltage surge protection sub-circuit.

[0227] In the present invention, the anti-reverse connection sub-circuit realizes the anti-reverse connection protection function mainly through the auxiliary source generation module, the first MOS transistor Q1, the second MOS transistor Q2 and the first triode Q3.

[0228] Specifically, the implementation principle of the anti-reverse connection sub-circuit is as follows: when the voltage of the input power supply is normally input, the pin +VB is powered on through the body diodes of the first MOS tube Q1 and the second MOS tube Q2, so that the auxiliary source generating chip U22 can work normally, and the second pin of the auxiliary source generating chip U22 outputs a 120kHZ square wave, which is passed through a rectifier circuit composed of a twelfth capacitor C12, a thirteenth capacitor C13, a third diode V3 and a fourth diode V4 to obtain a DC auxiliary source, wherein the auxiliary source voltage of the DC auxiliary source is 11 higher than the pin +VB voltage. V (the normal voltage range of the pin +VB is 18V to 36V), the DC auxiliary source passes through the fifth triode Q7, and then passes through the second resistor R2, the third resistor R3 and the fourth resistor R4 to reach the gates of the first MOS tube Q1 and the second MOS tube Q2. Because the DC auxiliary source is 11V higher than the pin +VB, it is equivalent to the VGS voltage of the first MOS tube Q1 and the second MOS tube Q2 being 10.3V, which is greater than the turn-on voltage, so that the first MOS tube Q1 and the second MOS tube Q2 are saturated and turned on, so that the multi-channel output power supply system works normally;

[0229] When the input power is reversely connected, that is, pin 28V1 is at the ground level, and pin 28V1GND is at a high level. At this time, the high level passes through the first resistor R1 and then through the first transistor Q3. Since the base voltage of the first transistor Q3 is higher than the emitter voltage by more than 0.6V, the first transistor Q3 is saturated and turned on, so that the cathode of the second diode V2 is grounded, and the anode voltage of the second diode V2 is clamped to 0.7V, so that the VGS voltage of the first MOS tube Q1 and the second MOS tube Q2 is 0.7V, which is less than the turn-on voltage, so that the first MOS tube Q1 and the second MOS tube Q2 are turned off, protecting the subsequent devices of the multi-channel output power system from damage, and realizing the anti-reverse connection protection function.

[0230] Based on the anti-reverse connection sub-circuit, when the input power is connected in the forward direction, the anti-reverse connection circuit is directly connected, so that the multi-channel output power supply system works normally; when the input power is connected in the reverse direction, the anti-reverse connection circuit is activated, thereby ensuring that the multi-channel output power supply system will not be damaged due to misoperation.

[0231] Furthermore, if Figure 3As shown, the voltage surge protection sub-circuit includes: a third zener diode D3, a fourth zener diode D4, a fifth zener diode D5, a sixth zener diode D6, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a third MOS tube Q8, a fourth MOS tube Q9, a sixth transistor Q10 and a seventh transistor Q11;

[0232] The drain of the third MOS transistor Q8 and the drain of the fourth MOS transistor Q9 serve as the first input terminal of the voltage surge protection sub-circuit;

[0233] The cathode of the third voltage stabilizing diode D3 and the first end of the fourteenth resistor R14 serve as the second input end of the voltage surge protection sub-circuit;

[0234] The source of the third MOS transistor Q8, the source of the fourth MOS transistor Q9, the first end of the twentieth resistor R20, the first end of the twenty-third resistor R23, the cathode of the sixth voltage zener diode D6, the first end of the nineteenth capacitor C19, the first end of the twenty-fifth resistor R25 and the first end of the twenty-sixth resistor R26 serve as the output end of the voltage surge protection sub-circuit;

[0235] The second end of the fourteenth resistor R14 is electrically connected to the first end of the fifteenth resistor R15;

[0236] The gate of the third MOS transistor Q8 is electrically connected to the first end of the sixteenth resistor R16 and the first end of the fifteenth capacitor C15;

[0237] The gate of the fourth MOS transistor Q9 is electrically connected to the first end of the seventeenth resistor R17 and the first end of the sixteenth capacitor C16;

[0238] A second end of the sixteenth resistor R16 is electrically connected to the second end of the fifteenth resistor R15, the second end of the fifteenth capacitor C15, the second end of the seventeenth resistor R17, the second end of the sixteenth capacitor C16, the first end of the eighteenth resistor R18 and the cathode of the fourth zener diode D4;

[0239] A second end of the eighteenth resistor R18 is electrically connected to the anode of the fourth voltage stabilizing diode D4, a first end of the seventeenth capacitor C17, a first end of the nineteenth resistor R19 and a collector of the sixth transistor Q10;

[0240] A second end of the twentieth resistor R20 is electrically connected to the base of the sixth transistor Q10, a first end of the twenty-first resistor R21, and a first end of the twenty-second resistor R22;

[0241] The emitter of the sixth transistor Q10 is electrically connected to the first end of the eighteenth capacitor C18, the cathode of the fifth voltage stabilizing diode D5 and the collector of the seventh transistor Q11;

[0242] A second end of the twenty-third resistor R23 is electrically connected to the emitter of the seventh transistor Q11;

[0243] An anode of the sixth voltage stabilizing diode D6 is electrically connected to a base of the seventh transistor Q11 and a first end of the twenty-fourth resistor R24;

[0244] The second end of the seventeenth capacitor C17, the second end of the nineteenth resistor R19, the second end of the eighteenth capacitor C18, the anode of the fifth Zener diode D5, the second end of the twenty-fourth resistor R24, the second end of the nineteenth capacitor C19, the second end of the twenty-fifth resistor R25, the second end of the twenty-sixth resistor R26, the second end of the twenty-first resistor R21 and the second end of the twenty-second resistor R22 are grounded.

[0245] In this embodiment, the fifth voltage stabilizing diode D5 is a 12V voltage stabilizing diode, and the base-emitter voltage drop of the sixth transistor Q10 is 0.7V.

[0246] In this embodiment, the third MOS transistor Q8 and the fourth MOS transistor Q9 are NMOS transistors.

[0247] In the present invention, the fifth voltage stabilizing diode D5, the eighteenth capacitor C18, the sixth transistor Q10, the twentieth resistor R20, the twenty-first resistor R21 and the twenty-second resistor R22 constitute a pre-stabilizing module; in the pre-stabilizing module, the pre-stabilizing voltage is obtained by dividing the voltage through the twentieth resistor R20, the twenty-first resistor R21 and the twenty-second resistor R22, and the pre-stabilizing voltage value is determined by the various device parameters of the pre-stabilizing module, and the pre-stabilizing voltage value is expressed by the following formula:

[0248] V=(12+0.7)*R20 / (R21 / / R22);

[0249] In the above formula, R20 is the resistance value of the twentieth resistor R20; R21 is the resistance value of the twenty-first resistor R21; and R22 is the resistance value of the twenty-second resistor R22.

[0250] To facilitate the explanation of the working principle of the voltage surge protection subcircuit, the present embodiment sets the pre-regulated voltage value to 36V, the resistance values ​​of the fourteenth resistor R14, the fifteenth resistor R15 and the eighteenth resistor R18 to R14=R15=R18=20K (ohms), and the resistance value of the nineteenth resistor R19 to R19=1M (ohms). The working principle of the voltage surge protection subcircuit is:

[0251] When the voltage of the input power supply is in the normal range of DC18V-36V, the voltage of the DC auxiliary source is 29V-47V, and the voltage of the DC auxiliary source always follows the voltage of the input power supply; the DC auxiliary source is divided by the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the eighteenth resistor R18 and the nineteenth resistor R19, and since R14=R15=R18=20K, R19=1M, the gate voltage of the third MOS tube Q8 and the fourth MOS tube Q9 is always about 10V higher than the source voltage after the resistor voltage division, so that the third MOS tube Q8 and the fourth MOS tube Q9 are turned on, and the multi-channel output power supply system works normally, and since the divided voltage of the twentieth resistor R20, the twenty-first resistor R21 and the twenty-second resistor R22 is less than 12.7V, the sixth transistor Q10 is turned off, and the work is not affected;

[0252] When the voltage of the input power supply is higher than 36V, for example, 80V / 50ms, the voltage of the twentieth resistor R20, the twenty-first resistor R21 and the twenty-second resistor R22 is greater than 12.7V, so that the sixth transistor Q10 is turned on, and the voltage at the collector of the sixth transistor Q10 is pulled to be consistent with the emitter voltage, which is 12V, so that the gate voltage of the third MOS transistor Q8 and the fourth MOS transistor Q9 is lower than the source voltage, and the third MOS transistor Q8 and the fourth MOS transistor Q9 are turned off. After being turned off, the output voltage of the pin 28V2 is reduced again, so that the sixth transistor Q10 is turned off, and the third MOS transistor Q8 and the fourth MOS transistor Q9 are turned on normally again. Such a reciprocating cycle finally reaches a stable state, so that the third MOS transistor Q8 and the fourth MOS transistor Q9 work in the amplification state, and the output voltage of the pin 28V2 is stabilized to the pre-regulated voltage value, completing the voltage surge protection.

[0253] Compared with the normal operation of the traditional power supply (18V-36V), the sudden increase of input voltage (40V-80V) will cause the fluctuation of output voltage and even damage the power supply. The present invention detects the input voltage in real time through the voltage surge protection subcircuit. When the input voltage exceeds the preset pre-regulated voltage value, the feedback circuit quickly controls the high-power MOS tube to work in the amplification state to withstand the high voltage, thereby clamping the input voltage at the pre-regulated voltage value to avoid fluctuation of power supply output and even damage.

[0254] The present invention can also suppress high-voltage interference of 80V high-voltage input through the voltage surge protection sub-circuit, ensuring that the multi-channel output power supply system works more reliably.

[0255] Furthermore, the multi-output power supply system with a power-off retention function also includes: a power supply system monitoring circuit; the power supply system monitoring circuit includes an MCU control module and an auxiliary power supply circuit; the input end of the auxiliary power supply circuit is electrically connected to the output end of the voltage surge protection subcircuit, and the auxiliary power supply circuit is used to output a low-voltage power supply to power the MCU control module; the MCU control module is used to receive operating data of the multi-output power supply system and output a control signal according to the operating data; the operating data includes output power status data, output power current data, temperature data and input voltage data.

[0256] In this embodiment, the auxiliary power supply circuit is used to output a +5V low-voltage power supply.

[0257] In this embodiment, the MCU control module has one RS422 asynchronous bidirectional serial port and an RS422 communication function, which can realize real-time reporting of temperature, output current and output status; based on the RS422 communication function of the MCU control module, the multi-channel output power supply system of the present invention can realize remote control function, and has the monitoring and real-time reporting function of power supply temperature, power supply output current and power supply status, thereby realizing health management of the power supply system.

[0258] Please refer to the following Figure 5 , Figure 5 A circuit diagram of an embodiment of a current surge protection subcircuit provided by the present invention.

[0259] Furthermore, if Figure 5 As shown, the current surge protection sub-circuit includes: a first coupler U1, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a twentieth capacitor C20, a twenty-first capacitor C21, a seventh voltage zener diode D7, an eighth transistor Q12, a fifth MOS transistor Q13, a sixth MOS transistor Q14 and a seventh MOS transistor Q15;

[0260] The first end of the twenty-seventh resistor R27, the first end of the twenty-eighth resistor R28, and the first end of the twentieth capacitor C20 serve as an input end and an output end of the current surge protection sub-circuit;

[0261] A second end of the twenty-seventh resistor R27 is electrically connected to a second end of the twenty-eighth resistor R28 and a first end of the first coupler U1;

[0262] The second end of the first coupler U1 is electrically connected to the cathode of the seventh zener diode D7, the first end of the twenty-ninth resistor R29, the first end of the twenty-first capacitor C21, the first end of the thirtieth resistor R30, the first end of the thirty-first resistor R31 and the first end of the thirty-second resistor R32;

[0263] A second end of the 30th resistor R30 is electrically connected to the gate of the fifth MOS transistor Q13;

[0264] A second end of the thirty-first resistor R31 is electrically connected to the gate of the sixth MOS transistor Q14;

[0265] A second end of the thirty-second resistor R32 is electrically connected to the gate of the seventh MOS transistor Q15;

[0266] The third end of the first coupler U1 is electrically connected to the first end of the thirty-seventh resistor R37;

[0267] A second end of the thirty-seventh resistor R37 is electrically connected to the low voltage power supply;

[0268] The fourth end of the first coupler U1 is electrically connected to the collector of the eighth transistor Q12;

[0269] A base of the eighth transistor Q12 is electrically connected to a first end of a thirty-fifth resistor R35 and a first end of a thirty-sixth resistor R36;

[0270] A second end of the thirty-sixth resistor R36 is electrically connected to the MCU control module;

[0271] The second end of the twentieth capacitor C20, the anode of the seventh zener diode D7, the second end of the twenty-ninth resistor R29, the second end of the twenty-first capacitor C21, the source of the fifth MOS tube Q13, the source of the sixth MOS tube Q14, the source of the seventh MOS tube Q15, the drain of the fifth MOS tube Q13, the drain of the sixth MOS tube Q14, the drain of the seventh MOS tube Q15, the first end of the thirty-third resistor R33, the first end of the thirty-fourth resistor R34, the second end of the thirty-third resistor R33, the second end of the thirty-fourth resistor R34, the emitter of the eighth transistor Q12 and the second end of the thirty-fifth resistor R35 are grounded.

[0272] In this embodiment, pin 28V4 serves as the input and output of the current surge protection sub-circuit.

[0273] In this embodiment, the first coupler U1 is a photoelectric coupler; the thirty-third resistor R33 and the thirty-fourth resistor R34 are power resistors.

[0274] In the present invention, the second end of the thirty-sixth resistor R36 is electrically connected to the MCU control module, and is used to receive the current surge control signal LY2 of the MCU control module.

[0275] After power-on, since the fifth MOS tube Q13, the sixth MOS tube Q14 and the seventh MOS tube Q15 are cut off, the power supply charges the rear-end large capacitor through the thirty-third resistor R33 and the thirty-fourth resistor R34; due to the power-on moment, the rear-end large capacitor is equivalent to a short circuit, and if there is no resistor to limit the current, the instantaneous current of power-on will be very large; after power-on, the auxiliary power supply and the MCU control module work, and after a fixed delay, LY2 gives a high-level signal to control the eighth triode Q12 to be turned on, thereby turning on the first coupler U1, and the gate voltages of the fifth MOS tube Q13, the sixth MOS tube Q14 and the seventh MOS tube Q15 exceed the turn-on voltage, so that the fifth MOS tube Q13, the sixth MOS tube Q14 and the seventh MOS tube Q15 are saturated and turned on, thereby short-circuiting the thirty-third resistor R33 and the thirty-fourth resistor R34, and the load starts to work normally without causing the thirty-third resistor R33 and the thirty-fourth resistor R34 to heat up and be damaged.

[0276] Further, the boost energy storage circuit comprises: a boost energy storage subcircuit, an input voltage detection subcircuit and an energy storage discharge control subcircuit;

[0277] The input end of the boost energy storage subcircuit serves as the input end of the boost energy storage circuit;

[0278] The output end of the energy storage discharge control subcircuit serves as the output end of the boost energy storage circuit;

[0279] The output end of the boost energy storage subcircuit is electrically connected to the input end of the energy storage discharge control subcircuit;

[0280] The input end of the input voltage detection subcircuit is electrically connected to the output end of the voltage surge protection subcircuit; the output end of the input voltage detection subcircuit is electrically connected to the control end of the energy storage discharge control subcircuit;

[0281] The boost energy storage subcircuit is used to boost the second power supply to output a boosted power supply; the boost energy storage subcircuit is also used to store energy based on the boosted power supply to obtain stored energy;

[0282] The input voltage detection subcircuit is used to determine whether the input power supply is interrupted or whether the input power supply voltage value is lower than a preset threshold;

[0283] The energy storage discharge control subcircuit is used to output energy storage power based on stored energy when the boost energy storage subcircuit determines that the input power is interrupted or the input power voltage value is lower than a preset threshold.

[0284] Please refer to the following Figure 6 , Figure 6 A circuit diagram of an embodiment of a boost energy storage subcircuit provided by the present invention.

[0285] Furthermore, if Figure 6 As shown, the boost energy storage sub-circuit includes: a flyback chip MK6, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, a third inductor L3, a fifth diode V5, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29 and a thirtieth capacitor C30; the fortieth resistor R40 is a power resistor, the twenty-ninth capacitor C29 and the thirtieth capacitor C30 are large capacitors; the twenty-ninth capacitor C29 and the thirtieth capacitor C30 are used to store energy based on the boost power supply to obtain stored energy;

[0286] The first end of the third inductor L3 and the first end of the twenty-second capacitor C22 serve as input ends of the boost energy storage sub-circuit;

[0287] The second end of the 40th resistor R40, the positive electrode of the 29th capacitor C29 and the positive electrode of the 30th capacitor C30 serve as the output end of the boost energy storage sub-circuit;

[0288] The second end of the third inductor L3 is electrically connected to the first end of the twenty-third capacitor C23, the first end of the twenty-fourth capacitor C24, the second end of the twenty-fifth capacitor C25, and the first pin of the flyback chip MK6;

[0289] The fifth pin of the flyback chip MK6 is electrically connected to the second end of the thirty-eighth resistor R38 and the first end of the thirty-ninth resistor R39;

[0290] The sixth pin of the flyback chip MK6 is electrically connected to the first end of the thirty-eighth resistor R38, the first end of the twenty-seventh capacitor C27, the first end of the twenty-eighth capacitor C28 and the anode of the fifth diode V5;

[0291] A cathode of the fifth diode V5 is electrically connected to a first end of the fortieth resistor R40;

[0292] The third pin of the flyback chip MK6 is left floating;

[0293] A first end of the twenty-fifth capacitor C25 and a second end of the twenty-sixth capacitor C26 are connected to the ground line;

[0294] The second end of the twenty-second capacitor C22, the second end of the twenty-third capacitor C23, the second end of the twenty-fourth capacitor C24, the first end of the twenty-sixth capacitor C26, the second pin of the flyback chip MK6, the fourth pin of the flyback chip MK6, the second end of the thirty-ninth resistor R39, the second end of the twenty-seventh capacitor C27, the second end of the twenty-eighth capacitor C28, the negative electrode of the twenty-ninth capacitor C29 and the negative electrode of the thirtieth capacitor C30 are grounded.

[0295] In the present invention, the boost energy storage sub-circuit is a flyback circuit; the twenty-eighth capacitor C28 and the twenty-ninth capacitor C29 serve as energy storage power sources to achieve energy storage.

[0296] The formula for capacitor energy storage is Q=1 / 2CU2. Under the condition of the same capacitor capacity, the higher the voltage, the more energy is stored. The energy stored in the capacitor directly determines the length of time the output load is maintained after the input power is interrupted. The present invention adopts a boost energy storage sub-circuit to increase the 18V~36V voltage of the input power supply to 40V, and then charges the 29th capacitor C29 and the 30th capacitor C30 through the 40th resistor R40 to store energy.

[0297] In this embodiment, the model of the 40th resistor R40 is 6W / 75R, which is used to limit the charging current to prevent the flyback chip MK6 from being burned due to overcurrent, and prevent the energy of the 29th capacitor C29 and the 30th capacitor C30 from returning to the previous circuit through the fifth diode V5, resulting in the loss of stored energy.

[0298] Please refer to the following Figure 7 , Figure 7 A circuit diagram of an embodiment of the energy storage and discharge control subcircuit provided by the present invention.

[0299] Furthermore, if Figure 7 As shown, the energy storage discharge control subcircuit includes: a forty-first resistor R41, a forty-second resistor R42, a forty-third resistor R43, a forty-fourth resistor R44, a forty-fifth resistor R45, a second coupler U26, an eighth MOS transistor Q16, a ninth MOS transistor Q17, a tenth MOS transistor Q18, an eighth voltage regulator diode D8, a thirty-first capacitor C31 and an ideal diode controller chip U27;

[0300] The source of the eighth MOS tube Q16, the source of the ninth MOS tube Q17 and the fourth pin of the ideal diode controller chip U27 serve as the input end of the energy storage discharge control sub-circuit;

[0301] The drain of the tenth MOS tube Q18 serves as the output end of the energy storage discharge control subcircuit;

[0302] The second end of the second coupler U26 serves as the control end of the energy storage discharge control subcircuit;

[0303] The gate of the eighth MOS transistor Q16 is electrically connected to the first end of the forty-first resistor R41;

[0304] The gate of the ninth MOS transistor Q17 is electrically connected to the first end of the forty-second resistor R42;

[0305] The fifth pin of the ideal diode controller chip U27 is electrically connected to the second end of the forty-first resistor R41 and the second end of the forty-second resistor R42;

[0306] The drain of the eighth MOS tube Q16 is electrically connected to the drain of the ninth MOS tube Q17, the sixth pin of the ideal diode controller chip U27, the first end of the forty-fourth resistor R44, the cathode of the eighth voltage stabilizing diode D8, the first end of the thirty-first capacitor C31 and the source of the tenth MOS tube Q18;

[0307] A first end of the forty-fifth resistor R45 is electrically connected to the second end of the forty-fourth resistor R44, the anode of the eighth voltage zener diode D8, the second end of the thirty-first capacitor C31 and the gate of the tenth MOS transistor Q18;

[0308] The second end of the forty-fifth resistor R45 is electrically connected to the third end of the second coupler U26;

[0309] A first end of the second coupler U26 is electrically connected to a second end of the forty-third resistor R43;

[0310] A first end of the forty-third resistor R43 is electrically connected to the low voltage power supply;

[0311] The first pin and the third pin of the ideal diode controller chip U27 are left floating;

[0312] The second pin of the ideal diode controller chip U27 and the fourth end of the second coupler U26 are grounded.

[0313] In the present invention, the ideal diode controller chip U27 and the eighth MOS tube Q16 and the ninth MOS tube Q17 together constitute an ideal diode to realize the unidirectional conduction function of the diode; when the power is just turned on, due to the large capacity of the twenty-ninth capacitor C29 and the thirtieth capacitor C30, the voltage rises slowly, and the rear stage circuit works normally, and the voltage is higher than the voltage of the twenty-ninth capacitor C29 and the thirtieth capacitor C30, which prevents the normal working voltage of the rear stage from entering the twenty-ninth capacitor C29 and the thirtieth capacitor C30 through the body diode of the tenth MOS tube Q18 and lowering the normal working voltage of the rear stage.

[0314] When the input voltage is undervoltage, the twenty-ninth capacitor C29 and the thirtieth capacitor C30 can supply power to the subsequent stage through the fully-conducted eighth MOS tube Q16 and ninth MOS tube Q17, and then through the tenth MOS tube Q18, thereby reducing the energy loss caused by the voltage drop of ordinary diodes.

[0315] Please refer to the following Figure 8 , Figure 8 A circuit diagram of an embodiment of an input voltage detection subcircuit provided by the present invention.

[0316] Furthermore, if Figure 8 As shown, the input voltage detection subcircuit includes: a forty-sixth resistor R46, a forty-seventh resistor R47, a forty-eighth resistor R48, a forty-ninth resistor R49, a fiftieth resistor R50, a fifty-first resistor R51, a fifty-second resistor R52, a fifty-third resistor R53, a fifty-fourth resistor R54, a fifty-fifth resistor R55, a fifty-sixth resistor R56, a thirty-second capacitor C32, a ninth transistor Q19, a third coupler U29, a fourth coupler U30 and a voltage reference chip V6;

[0317] a first end of the forty-sixth resistor R46, a first end of the forty-seventh resistor R47, a first end of the fiftieth resistor R50, a first end of the fifty-first resistor R51, and a first end of the fifty-second resistor R52 as input ends of the input voltage detection sub-circuit;

[0318] The collector of the ninth transistor Q19 serves as the output terminal of the input voltage detection subcircuit;

[0319] The second end of the forty-sixth resistor R46 is electrically connected to the second end of the forty-seventh resistor R47, the first end of the forty-eighth resistor R48, the first end of the forty-ninth resistor R49, the first end of the thirty-second capacitor C32 and the first pin of the voltage reference chip V6;

[0320] A second end of the fiftieth resistor R50 is electrically connected to the second pin of the voltage reference chip V6 and the second end of the fourth coupler U30;

[0321] A second end of the fifty-first resistor R51 is electrically connected to a second end of the fifty-second resistor R52 and a first end of the third coupler U29;

[0322] The second end of the third coupler U29 is electrically connected to the first end of the fourth coupler U30;

[0323] A third end of the third coupler U29 is electrically connected to the second end of the fifty-third resistor R53 and the first end of the fifty-fourth resistor R54;

[0324] A second end of the fifty-fourth resistor R54 is electrically connected to a first end of the fifty-sixth resistor R56 and a base of the ninth transistor Q19;

[0325] A first end of a fifty-third resistor R53 and a second end of a fifty-fifth resistor R55 are connected to a low voltage power supply;

[0326] A third end of the fourth coupler U30 is electrically connected to the MCU control module and a first end of the fifty-fifth resistor R55;

[0327] The second end of the forty-eighth resistor R48, the second end of the forty-ninth resistor R49, the second end of the thirty-second capacitor C32, the third pin of the voltage reference chip V6, the fourth end of the third coupler U29, the fourth end of the fourth coupler U30, the second end of the fifty-sixth resistor R56 and the emitter of the ninth transistor Q19 are grounded.

[0328] In this embodiment, the tenth MOS transistor Q18 is an NMOS transistor.

[0329] In this embodiment, the pin 28V2 is the input terminal of the input voltage detection sub-circuit.

[0330] In this embodiment, the voltage reference chip V6 is the voltage reference chip 431, and its reference voltage is 2.5V.

[0331] To facilitate understanding of the working principle of the input voltage detection subcircuit, the input undervoltage value (preset threshold) is set to 16V in this embodiment.

[0332] When the input voltage of the input power supply is higher than 16V, the input voltage at the pin 28V2 is divided by the forty-sixth resistor R46, the forty-seventh resistor R47, the forty-eighth resistor R48 and the forty-ninth resistor R49, so that the voltage obtained by the voltage division is higher than 2.5V, so that the voltage reference chip V6 is turned on, and the second pin of the voltage reference chip V6 is grounded, thereby turning on the third coupler U29 and the fourth coupler U30. At this time, the MCU control module collects a low level through the fifty-fifth resistor R55, thereby determining that the voltage of the input power supply is normal;

[0333] When the input voltage of the input power supply is lower than 16V, the input voltage at pin 28V2 is divided by the forty-sixth resistor R46, the forty-seventh resistor R47, the forty-eighth resistor R48 and the forty-ninth resistor R49, so that the divided voltage is less than 2.5V, the voltage reference chip V6 is not conducting, and then the third coupler U29 and the fourth coupler U30 are not conducting, and the MCU control module performs input under-voltage detection through the fifty-fifth resistor R55, collects a high level, and thus determines that the voltage of the input power supply is under-voltage.

[0334] Based on the input voltage detection subcircuit, when the voltage of the input power supply is normal, the third coupler U29 and the fourth coupler U30 are turned on, causing the ninth transistor Q19 to be turned off, and then causing the second coupler U26 to be turned off, and further causing the tenth MOS transistor Q18 to be turned off, thereby ensuring that the energy of the twenty-ninth capacitor C29 and the thirtieth capacitor C30 is not discharged to the outside;

[0335] When the voltage of the input power supply is undervoltage, the third coupler U29 and the fourth coupler U30 are not turned on, causing the ninth transistor Q19 to be turned on, thereby causing the second coupler U26 to be turned on, and further causing the tenth MOS tube Q18 to be turned on, thereby ensuring that the energy of the twenty-ninth capacitor C29 and the thirtieth capacitor C30 is discharged to the subsequent circuit through the eighth MOS tube Q16, the ninth MOS tube Q17 and the tenth MOS tube Q18, ensuring normal output at the moment (50ms) of input power failure.

[0336] Furthermore, the power supply system monitoring circuit also includes a current acquisition module; the current acquisition module is used to collect output power current data of the output power supply and output the output power current data.

[0337] Please refer to the following Fig. 9 , Fig. 9 A circuit diagram of an embodiment of a current acquisition module provided by the present invention.

[0338] like Fig. 9 As shown, the current acquisition module includes: a current acquisition chip U4, a multi-capacitor parallel module, an RC parallel module, a thirty-third capacitor C33, a thirty-fourth capacitor C34, a thirty-fifth capacitor C35, a fifty-seventh resistor R57 and a fifty-eighth resistor R58;

[0339] The first pin of the current acquisition chip U4, the second pin of the current acquisition chip U4 and the first end of the multi-capacitor parallel module are electrically connected to the first output power supply;

[0340] The third pin of the current collection chip U4, the fourth pin of the current collection chip U4 and the first end of the RC parallel module are electrically connected to the second output power supply;

[0341] The second end of the thirty-fifth capacitor C35, the first end of the fifty-seventh resistor R57 and the first end of the fifty-eighth resistor R58 serve as the output end of the current acquisition module;

[0342] The eighth pin of the current acquisition chip U4 and the first end of the thirty-third capacitor C33 are connected to a low-voltage power supply;

[0343] The seventh pin of the current acquisition chip U4 is electrically connected to the first end of the fifty-seventh resistor R57;

[0344] The sixth pin of the current acquisition chip U4 is electrically connected to the first end of the thirty-fourth capacitor C34;

[0345] The second end of the multi-capacitor parallel module, the second end of the RC parallel module, the second end of the thirty-third capacitor C33, the second end of the thirty-fourth capacitor C34, the second end of the thirty-fifth capacitor C35, the second end of the fifty-eighth resistor R58 and the fifth pin of the current acquisition chip U4 are grounded.

[0346] In this embodiment, the current acquisition chip U4 is a Hall sensor.

[0347] In this embodiment, the multi-capacitor parallel module is composed of capacitors C47 to C54 connected in parallel, and the RC parallel module is composed of capacitors C55, C56 and resistor R45 connected in parallel.

[0348] The present invention is based on a current acquisition module. The present invention converts the current value of the output power supply into an analog voltage signal through a fixed ratio and transmits it to the IO port (ADC) of the MCU control module. Specifically, the current of one output power supply is collected through the first pin and the second pin of the current acquisition chip U4, and the current of another output power supply is collected through the third pin and the fourth pin of the current acquisition chip U4. By setting a plurality of current acquisition modules, the collection of the output power supply current is realized.

[0349] Furthermore, the power supply system monitoring circuit also includes a temperature acquisition module; the temperature acquisition module is used to collect the temperatures of multiple output power supplies with different voltages and powers, and output temperature data, so that the MCU control module outputs a conversion control signal based on the temperature data, and controls the power supply output branch based on the conversion control signal.

[0350] Please refer to the following Fig.10 , Fig.10 A circuit diagram of an embodiment of a temperature acquisition module provided by the present invention.

[0351] like Fig.10 As shown, the temperature acquisition module includes: a thermistor U17, a current limiting resistor R78 and a filter capacitor C65;

[0352] The first end of the thermistor U17, the second end of the current limiting resistor R78 and the first end of the filter capacitor C65 serve as the output end of the temperature acquisition module;

[0353] A first end of the current limiting resistor R78 is connected to a low voltage power supply;

[0354] A second end of the thermistor U17 and a second end of the filter capacitor C65 are grounded.

[0355] In this embodiment, pin WD4 is the output end of the temperature acquisition module, which outputs temperature data to the MCU control module.

[0356] In this embodiment, the thermistor U17 is an NTC thermistor. When the temperature is higher, the resistance of the thermistor U17 is smaller.

[0357] The present invention realizes temperature acquisition of multiple output power supplies by adopting multiple identical temperature acquisition modules. Specifically, when the temperature exceeds a set value, the thermistor U17 divides the voltage with the current limiting resistor R78, and then outputs a real-time signal to the IO port (ADC) of the MCU control module through the pin WD4, so that the MCU control module can judge the temperature of the multiple output power supplies by the size of the AD value, thereby realizing temperature acquisition and monitoring of the output power supplies.

[0358] The present invention obtains output power supply current data and temperature data based on a current acquisition module and a temperature acquisition module, so that an MCU control module in a power system monitoring circuit outputs a control signal according to the operating data.

[0359] Furthermore, the multi-channel output power supply system with a power-off retention function further includes an output filter circuit, and the output filter circuit is used to filter out high-frequency components of the output power.

[0360] Please refer to the following Fig.11 , Fig.11 A circuit diagram of an embodiment of an output filter circuit provided by the present invention.

[0361] Furthermore, if Fig.11 As shown, the output filter circuit includes: a thirty-sixth capacitor C36, a thirty-seventh capacitor C37 and a fourth inductor L4;

[0362] The first end of the fourth inductor L4 and the first end of the thirty-sixth capacitor C36 serve as input ends of the output filter circuit;

[0363] The second end of the fourth inductor L4 and the first end of the thirty-seventh capacitor C37 serve as an output end of the output filter circuit;

[0364] A second end of the thirty-sixth capacitor C36 and a second end of the thirty-seventh capacitor C37 are grounded.

[0365] In one embodiment, the present invention sets an output filter circuit at each output end of the multi-output power supply, and forms a CLC low-pass filter through the thirty-sixth capacitor C36, the thirty-seventh capacitor C37 and the fourth inductor L4, so that both the input and the output have low impedance, which can filter out the high-frequency components on the output power supply and reduce the power supply output ripple.

[0366] Furthermore, the power output branch includes a plurality of power conversion modules;

[0367] The first power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply to output a first output power supply with a first preset voltage and a first preset power;

[0368] The second power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply to output a second output power supply with a second preset voltage and a second preset power;

[0369] The third power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply, and output a third output power supply with a third preset voltage and a third preset power;

[0370] The fourth power conversion module is used to perform voltage conversion processing on the first power supply to output a fourth output power supply with a fourth preset voltage and a fourth preset power.

[0371] Furthermore, each power conversion module performs temperature acquisition through a temperature acquisition module, and each power conversion module has an enable control port. When the MCU control module determines through the temperature acquisition module that the temperature of a power conversion module exceeds a preset temperature threshold, it outputs a shutdown control signal to the enable control port of the power conversion module to shut down the power conversion module.

[0372] In the present invention, the power output branch also has output overcurrent and short circuit protection functions.

[0373] Based on the above-mentioned multi-channel output power supply system, the present invention provides another embodiment of a multi-channel output power supply system with a power-off retention function.

[0374] Please refer to the following Fig.12 , Fig.12 A schematic structural diagram of another embodiment of a multi-output power supply system with a power-off retention function provided by the present invention.

[0375] Further, Fig.12The multi-channel output power supply system in the invention has the system structure of the multi-channel output power supply system, including a first power supply processing branch, a second power supply processing branch and a power supply output branch, wherein the circuit structure of its two-stage common mode component is the same as the second input filter circuit, the circuit structure of its anti-reverse connection and voltage surge component is the same as the anti-reverse connection sub-circuit and voltage surge protection sub-circuit, the circuit structure of its current surge component is the same as the current surge protection sub-circuit, the circuit structure of its boost circuit, current limiting resistor and energy storage power supply is the same as the boost energy storage sub-circuit; the function of its MCU component is the same as the MCU control module, and it has RS422 communication function. Based on the RS422 communication function, the MCU component The component can provide real-time current data monitoring for the external host computer through the I2C interface; based on the anti-reverse and voltage surge components and the above-mentioned temperature acquisition module, the multi-channel output power supply system has overvoltage status acquisition function and 4-channel output power temperature acquisition function; the multi-channel output power supply system has four DC / DC isolation converters, which are used to output 12V / 150W, 28V / 150W, 28V / 300W and 28V / 600W output power respectively; the multi-channel output power supply system realizes current acquisition of multi-channel output power through four Hall sensors, and realizes status acquisition of output power through four output indicator lights; the multi-channel output power supply system outputs 5V5W low-voltage power through an auxiliary source to power the MCU component.

[0376] In one embodiment, by optimizing the design of the current acquisition module and parameters, replacing the current acquisition chip with a lower cost, and optimizing the software program of the communication circuit, feedback is made more accurate and rapid, thereby achieving a higher accuracy and lower cost sampling feedback circuit to improve the monitoring accuracy and cost of the multi-output power supply system.

[0377] Based on the system structure and the above components, the multi-output power supply system can receive input power with an input voltage range of DC+28V (18V~36V), and has filtering, anti-spike, anti-reverse connection, anti-surge, pre-voltage regulation, and 50ms power-off retention functions. When the load is above 300W, the input power voltage is interrupted for 50ms, and the multi-output power supply system can still work normally under load without interruption or voltage fluctuation, ensuring a more reliable working state of the power supply.

[0378] When the voltage is input normally, the load is powered through the DC / DC isolation converter, and the input voltage is increased to a predetermined value through the boost circuit. The energy storage capacitor is then charged through the current limiting circuit until it is fully charged. At the same time, the output channel of the energy storage capacitor is closed through the energy storage discharge control subcircuit to prevent energy loss of the energy storage capacitor. When the input voltage detection circuit detects that the voltage of the input power supply drops below 16V or is interrupted, the energy storage discharge control subcircuit quickly opens the output channel of the energy storage capacitor to ensure the normal operation of the DC / DC isolation converter and continue to supply power to the load.

[0379] By implementing the present invention, a multi-channel output power supply system with a power-off retention function can be obtained, which has 1 airborne DC28V direct current power input interface; 1 controllable isolated DC12V direct current output interface; 3 controllable isolated DC12V direct current output interfaces; 1 RS422 asynchronous bidirectional serial port; 1 input power supply and 4 output power supply working indicator lights on the shell; Filtering, surge protection, spike protection, pre-voltage regulation, 50ms power-off functions; input power supply overvoltage reverse connection function; each output power supply has output overcurrent and short-circuit protection functions; when the power supply component input is normal steady-state voltage and abnormal steady-state voltage, the power conversion efficiency of the multi-channel output power supply system is not less than 85% (full load); it complies with the relevant provisions of the direct current power supply in GJB181-1986 "Aircraft Power Supply Characteristics"; and can be used as a 28V electrical device. When the rated voltage is suddenly applied, the peak value of the impact current generated should not be greater than 5 times the rated current, and return to the rated current within 100ms; its power output characteristics are shown in Table 1:

[0380] Table 1 Power supply output characteristics

[0381]

[0382]

[0383] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0384] The multi-channel output power supply system of the present invention filters, prevents reverse connection, performs surge protection and voltage conversion processing on the input power supply through the first power supply processing branch, the second power supply processing branch and the power supply output branch when the input power supply is normally supplied, outputs multiple output power supplies with different voltages and powers to supply power to the load, and stores energy through the boost energy storage circuit of the second power supply processing branch. When the input power supply is interrupted or the input power supply voltage value is lower than a preset threshold, the stored energy is output as energy storage power through the boost energy storage circuit of the second power supply processing branch, and finally the energy storage power is subjected to voltage conversion processing through the power supply output branch to output the output power. Therefore, the present invention realizes the technical purpose that when the input power supply is disconnected, the multi-channel output power supply system can still work normally with load without interruption or voltage fluctuation.

[0385] The present invention performs filtering processing, peak absorption processing, reverse connection protection, voltage surge protection and current surge protection on the input power supply through an input filtering circuit and a surge protection circuit, and can eliminate various interference signals in the input power supply to reduce the interference between the input power supply and the multi-channel output power supply system. When the input power supply is reversely connected, the components of the power supply system can be protected from damage, and the high voltage and high current interference of the input power supply can be suppressed, so as to stabilize the voltage of the output power supply, reduce voltage fluctuations, ensure a more reliable working state of the output power supply, improve the quality and stability of the output power supply, and thus improve the working efficiency, overall performance and reliability of the electrical equipment.

[0386] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-output power supply system with power-off retention function, characterized in that: include: A first power processing branch, a second power processing branch and a power output branch; The first power processing branch includes a first input filter circuit and a first surge protection circuit; The second power processing branch includes a second input filter circuit, a second surge protection circuit, and a boost energy storage circuit; The input end of the first input filter circuit serves as the input end of the first power supply processing branch; the first input filter circuit is used to filter and absorb peaks of the input power supply to output a first filtered power supply; The first surge protection circuit serves as an output end of the first power processing branch; The first surge protection circuit is used to protect the first filtered power supply from reverse connection, voltage surge and current surge, so as to output a first power supply; The input end of the second input filter circuit serves as the input end of the second power supply processing branch; the second input filter circuit is used to filter and absorb peaks of the input power supply to output a second filtered power supply; The output end of the second surge protection circuit serves as the first output end of the second power processing branch; The second surge protection circuit is used to protect the second filtered power supply from reverse connection, voltage surge and current surge, so as to output a second power supply; The output end of the boost energy storage circuit serves as the second output end of the second power processing branch; the boost energy storage circuit is used to perform a boost process on the second power supply to output a boosted power supply; The boost energy storage circuit is also used to store energy based on the boost power supply to obtain stored energy, and output the energy storage power supply based on the stored energy when the input power supply is interrupted or the input power supply voltage value is lower than a preset threshold; The power output branch is used to perform voltage conversion processing on the first power supply, the second power supply or the energy storage power supply to output multiple output power supplies with different voltages and powers.

2. A multi-output power supply system with power-off retention function as claimed in claim 1, characterized in that: The first input filter circuit and the second input filter circuit have the same circuit composition and circuit structure, and the second input filter circuit includes: a TVS tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first inductor, a second inductor and a common mode inductor; The first end of the TVS tube, the first end of the first capacitor and the first end of the common mode inductor serve as the input end of the second input filter circuit; The second end of the second inductor, the first end of the seventh capacitor, the first end of the eighth capacitor and the first end of the ninth capacitor serve as the output end of the second input filter circuit; The third end of the common mode inductor is electrically connected to the first end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor and the first end of the first inductor; The fourth end of the common mode inductor is electrically connected to the second end of the third capacitor, the first end of the fifth capacitor, the first end of the sixth capacitor and the first end of the second inductor; A first end of the first capacitor, a second end of the second capacitor, a first end of the third capacitor, and a second end of the fourth capacitor are connected to a ground line; The first end of the second capacitor, the second end of the TVS tube, the second end of the common mode inductor, the second end of the first inductor, the second end of the seventh capacitor, the second end of the eighth capacitor and the second end of the ninth capacitor are grounded.

3. A multi-output power supply system with power-off retention function as claimed in claim 1, characterized in that: The first surge protection circuit and the second surge protection circuit have the same circuit composition and circuit structure, and the second surge protection circuit includes: an anti-reverse connection subcircuit, a voltage surge protection subcircuit and a current surge protection subcircuit; The input end of the anti-reverse connection sub-circuit serves as the input end of the second surge protection circuit; The first output end of the anti-reverse connection sub-circuit is electrically connected to the first input end of the voltage surge protection sub-circuit, and the second output end of the anti-reverse connection sub-circuit is electrically connected to the second input end of the voltage surge protection sub-circuit; The output end of the voltage surge protection subcircuit is electrically connected to the input end of the current surge protection subcircuit; The output end of the current surge protection subcircuit serves as the output end of the second surge protection circuit to output the second power supply; The anti-reverse connection sub-circuit is used to disconnect the input power supply when the positive and negative poles of the input power supply are connected in reverse; The voltage surge protection subcircuit is used to perform voltage surge protection on the second filter power supply; The current surge protection subcircuit is used to perform current surge protection on the second filter power supply.

4. A multi-output power supply system with power-off retention function as claimed in claim 3, characterized in that: The anti-reverse connection sub-circuit comprises: an auxiliary source generation module, a first MOS tube, a second MOS tube, a first triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode; The anode of the first diode, the source of the first MOS tube, the source of the second MOS tube and the emitter of the first transistor serve as the input end of the anti-reverse connection sub-circuit; The drain of the first MOS tube, the drain of the second MOS tube and the input end of the auxiliary source generating module serve as the first output end of the anti-reverse connection sub-circuit; the second end of the fourth resistor and the output end of the auxiliary source generating module serve as the second output end of the anti-reverse connection sub-circuit; The cathode of the first diode is electrically connected to the first end of the first resistor and the base of the first transistor; The collector of the first triode is electrically connected to the cathode of the second diode; The anode of the second diode is electrically connected to the second end of the second resistor, the second end of the third resistor and the first end of the fourth resistor; A first end of the second resistor is electrically connected to the gate of the first MOS tube; A first end of the third resistor is electrically connected to the gate of the second MOS tube; A second terminal of the first resistor is grounded.

5. A multi-output power supply system with power-off retention function as claimed in claim 4, characterized in that: The auxiliary source generation module includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a first voltage-stabilizing diode, a second voltage-stabilizing diode, a third diode, a fourth diode, a second triode, a third triode, a fourth triode, a fifth triode and an auxiliary source generation chip; The first end of the fifth resistor, the cathode of the second voltage-stabilizing diode, the first end of the eighth resistor, the first end of the eleventh capacitor, the first end of the ninth resistor, the first end of the tenth resistor, the anode of the third diode, the first end of the thirteenth capacitor, the first end of the thirteenth resistor and the eighth pin of the auxiliary source generating chip serve as the input end of the auxiliary source generating module; The collector of the fifth triode serves as the output end of the auxiliary source generation module; The second end of the fifth resistor is electrically connected to the first end of the tenth capacitor, the cathode of the first voltage-stabilizing diode and the base of the second transistor; The anode of the second voltage stabilizing stage is electrically connected to the collector of the second triode and the base of the fourth triode; The emitter of the second triode is electrically connected to the first end of the sixth resistor; The second end of the sixth resistor is electrically connected to the first end of the seventh resistor and the base of the third transistor; The second end of the eighth resistor is electrically connected to the collector of the third triode; The second end of the eleventh capacitor is electrically connected to the second end of the ninth resistor, the emitter of the fourth transistor, the second end of the eleventh resistor, the fifth pin of the auxiliary source generating chip, the third pin of the auxiliary source generating chip and the second end of the fourteenth capacitor; A first end of the fourteenth capacitor is electrically connected to the seventh pin of the auxiliary source generating chip; The second end of the tenth resistor is electrically connected to the sixth pin of the auxiliary source generating chip and the first end of the eleventh resistor; The cathode of the third diode is electrically connected to the second end of the twelfth capacitor and the anode of the fourth diode; A first end of the twelfth capacitor is electrically connected to a second pin of the auxiliary source generating chip; The second end of the thirteenth capacitor is electrically connected to the cathode of the fourth diode, the first end of the twelfth resistor and the emitter of the fifth transistor; The second end of the thirteenth resistor is electrically connected to the second end of the twelfth resistor and the base of the fifth transistor; The first pin, the fourth pin and the ninth pin of the auxiliary source generating chip are left floating; The second end of the tenth capacitor, the anode of the first voltage-stabilizing diode, the second end of the seventh resistor, the emitter of the third transistor and the collector of the fourth transistor are grounded.

6. A multi-output power supply system with power-off retention function as claimed in claim 3, characterized in that: The voltage surge protection subcircuit includes: a third voltage zener diode, a fourth voltage zener diode, a fifth voltage zener diode, a sixth voltage zener diode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a third MOS tube, a fourth MOS tube, a sixth transistor and a seventh transistor; The drain of the third MOS tube and the drain of the fourth MOS tube serve as the first input terminal of the voltage surge protection sub-circuit; The cathode of the third voltage stabilizing diode and the first end of the fourteenth resistor serve as the second input end of the voltage surge protection subcircuit; The source of the third MOS tube, the source of the fourth MOS tube, the first end of the twentieth resistor, the first end of the twenty-third resistor, the cathode of the sixth voltage zener diode, the first end of the nineteenth capacitor, the first end of the twenty-fifth resistor and the first end of the twenty-sixth resistor serve as the output end of the voltage surge protection sub-circuit; The second end of the fourteenth resistor is electrically connected to the first end of the fifteenth resistor; The gate of the third MOS tube is electrically connected to the first end of the sixteenth resistor and the first end of the fifteenth capacitor; The gate of the fourth MOS tube is electrically connected to the first end of the seventeenth resistor and the first end of the sixteenth capacitor; The second end of the sixteenth resistor is electrically connected to the second end of the fifteenth resistor, the second end of the fifteenth capacitor, the second end of the seventeenth resistor, the second end of the sixteenth capacitor, the first end of the eighteenth resistor and the cathode of the fourth zener diode; The second end of the eighteenth resistor is electrically connected to the anode of the fourth voltage stabilizing diode, the first end of the seventeenth capacitor, the first end of the nineteenth resistor and the collector of the sixth transistor; The second end of the twentieth resistor is electrically connected to the base of the sixth transistor, the first end of the twenty-first resistor and the first end of the twenty-second resistor; The emitter of the sixth transistor is electrically connected to the first end of the eighteenth capacitor, the cathode of the fifth voltage stabilizing diode 5 and the collector of the seventh transistor; A second end of the twenty-third resistor is electrically connected to the emitter of the seventh transistor; An anode of the sixth voltage stabilizing diode is electrically connected to a base of the seventh transistor and a first end of the twenty-fourth resistor; The second end of the seventeenth capacitor, the second end of the nineteenth resistor, the second end of the eighteenth capacitor, the anode of the fifth Zener diode, the second end of the twenty-fourth resistor, the second end of the nineteenth capacitor, the second end of the twenty-fifth resistor, the second end of the twenty-sixth resistor, the second end of the twenty-first resistor and the second end of the twenty-second resistor are grounded.

7. A multi-output power supply system with power-off retention function as claimed in claim 3, characterized in that: Also includes: A power supply system monitoring circuit; the power supply system monitoring circuit includes an MCU control module and an auxiliary power supply circuit; the input end of the auxiliary power supply circuit is electrically connected to the output end of the voltage surge protection subcircuit, and the auxiliary power supply circuit is used to output a low-voltage power supply to power the MCU control module; the MCU control module is used to receive operating data of a multi-channel output power supply system and output a control signal according to the operating data; the operating data includes output power supply status data, output power supply current data, temperature data and input voltage data.

8. A multi-output power supply system with power-off retention function as claimed in claim 7, characterized in that: The current surge protection subcircuit includes: a first coupler, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a twentieth capacitor, a twenty-first capacitor, a seventh voltage stabilizing diode, an eighth transistor, a fifth MOS transistor, a sixth MOS transistor and a seventh MOS transistor; The first end of the twenty-seventh resistor, the first end of the twenty-eighth resistor, and the first end of the twentieth capacitor serve as an input end and an output end of the current surge protection sub-circuit; The second end of the twenty-seventh resistor is electrically connected to the second end of the twenty-eighth resistor and the first end of the first coupler; The second end of the first coupler is electrically connected to the cathode of the seventh zener diode, the first end of the twenty-ninth resistor, the first end of the twenty-first capacitor, the first end of the thirtieth resistor, the first end of the thirty-first resistor and the first end of the thirty-second resistor; A second end of the 30th resistor is electrically connected to the gate of the fifth MOS tube; A second end of the thirty-first resistor is electrically connected to the gate of the sixth MOS tube; A second end of the thirty-second resistor is electrically connected to the gate of the seventh MOS tube; The third end of the first coupler is electrically connected to the first end of the thirty-seventh resistor; A second end of the thirty-seventh resistor is electrically connected to the low voltage power supply; The fourth end of the first coupler is electrically connected to the collector of the eighth transistor; The base of the eighth transistor is electrically connected to the first end of the thirty-fifth resistor and the first end of the thirty-sixth resistor; A second end of the thirty-sixth resistor is electrically connected to the MCU control module; The second end of the twentieth capacitor, the anode of the seventh zener diode, the second end of the twenty-ninth resistor, the second end of the twenty-first capacitor, the source of the fifth MOS tube, the source of the sixth MOS tube, the source of the seventh MOS tube, the drain of the fifth MOS tube, the drain of the sixth MOS tube, the drain of the seventh MOS tube, the first end of the thirty-third resistor, the first end of the thirty-fourth resistor, the second end of the thirty-third resistor, the second end of the thirty-fourth resistor, the emitter of the eighth transistor and the second end of the thirty-fifth resistor are grounded.

9. A multi-output power supply system with power-off retention function as claimed in claim 7, characterized in that: The boost energy storage circuit comprises: a boost energy storage subcircuit, an input voltage detection subcircuit and an energy storage discharge control subcircuit; The input end of the boost energy storage subcircuit serves as the input end of the boost energy storage circuit; The output end of the energy storage discharge control subcircuit serves as the output end of the boost energy storage circuit; The output end of the boost energy storage subcircuit is electrically connected to the input end of the energy storage discharge control subcircuit; The input end of the input voltage detection subcircuit is electrically connected to the output end of the voltage surge protection subcircuit; the output end of the input voltage detection subcircuit is electrically connected to the control end of the energy storage discharge control subcircuit; The boost energy storage subcircuit is used to boost the second power supply to output a boosted power supply; the boost energy storage subcircuit is also used to store energy based on the boosted power supply to obtain stored energy; The input voltage detection subcircuit is used to determine whether the input power supply is interrupted or whether the input power supply voltage value is lower than a preset threshold; The energy storage discharge control subcircuit is used to output energy storage power based on stored energy when the boost energy storage subcircuit determines that the input power is interrupted or the input power voltage value is lower than a preset threshold.

10. A multi-output power supply system with power-off retention function as claimed in claim 9, characterized in that: The boost energy storage subcircuit includes: a flyback chip, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a third inductor, a fifth diode, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor and a thirtieth capacitor; the fortieth resistor is a power resistor, the twenty-ninth capacitor and the thirtieth capacitor are large capacitors; the twenty-ninth capacitor and the thirtieth capacitor are used to store energy based on the boost power supply to obtain stored energy; The first end of the third inductor and the first end of the twenty-second capacitor serve as input ends of the boost energy storage sub-circuit; The second end of the 40th resistor, the positive electrode of the 29th capacitor and the positive electrode of the 30th capacitor serve as output ends of the boost energy storage sub-circuit; The second end of the third inductor is electrically connected to the first end of the twenty-third capacitor, the first end of the twenty-fourth capacitor, the second end of the twenty-fifth capacitor, and the first pin of the flyback chip; The fifth pin of the flyback chip is electrically connected to the second end of the thirty-eighth resistor and the first end of the thirty-ninth resistor; The sixth pin of the flyback chip is electrically connected to the first end of the thirty-eighth resistor, the first end of the twenty-seventh capacitor, the first end of the twenty-eighth capacitor and the anode of the fifth diode; A cathode of the fifth diode is electrically connected to a first end of the fortieth resistor; The third pin of the flyback chip is left floating; A first end of the twenty-fifth capacitor and a second end of the twenty-sixth capacitor are connected to the ground line; The second end of the twenty-second capacitor, the second end of the twenty-third capacitor, the second end of the twenty-fourth capacitor, the first end of the twenty-sixth capacitor, the second pin of the flyback chip, the fourth pin of the flyback chip, the second end of the thirty-ninth resistor, the second end of the twenty-seventh capacitor, the second end of the twenty-eighth capacitor, the negative electrode of the twenty-ninth capacitor and the negative electrode of the thirtieth capacitor are grounded.

11. A multi-output power supply system with power-off retention function as claimed in claim 9, characterized in that: The energy storage discharge control subcircuit includes: a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a forty-fifth resistor, a second coupler, an eighth MOS transistor, a ninth MOS transistor, a tenth MOS transistor, an eighth voltage regulator diode, a thirty-first capacitor and an ideal diode controller chip; The source of the eighth MOS tube, the source of the ninth MOS tube and the fourth pin of the ideal diode controller chip serve as input terminals of the energy storage discharge control subcircuit; The drain of the tenth MOS tube serves as the output end of the energy storage discharge control subcircuit; The second end of the second coupler serves as a control end of the energy storage discharge control subcircuit; The gate of the eighth MOS tube is electrically connected to the first end of the forty-first resistor; The gate of the ninth MOS tube is electrically connected to the first end of the forty-second resistor; The fifth pin of the ideal diode controller chip is electrically connected to the second end of the forty-first resistor and the second end of the forty-second resistor; The drain of the eighth MOS tube is electrically connected to the drain of the ninth MOS tube, the sixth pin of the ideal diode controller chip, the first end of the forty-fourth resistor, the cathode of the eighth voltage stabilizing diode, the first end of the thirty-first capacitor and the source of the tenth MOS tube; The first end of the forty-fifth resistor is electrically connected to the second end of the forty-fourth resistor, the anode of the eighth voltage-stabilizing diode, the second end of the thirty-first capacitor, and the gate of the tenth MOS tube; The second end of the forty-fifth resistor is electrically connected to the third end of the second coupler; The first end of the second coupler is electrically connected to the second end of the forty-third resistor; A first end of the forty-third resistor is electrically connected to a low voltage power supply; The first and third pins of the ideal diode controller chip are left floating; The second pin of the ideal diode controller chip and the fourth end of the second coupler are grounded.

12. A multi-output power supply system with power-off retention function as claimed in claim 9, characterized in that: The input voltage detection subcircuit includes: a forty-sixth resistor, a forty-seventh resistor, a forty-eighth resistor, a forty-ninth resistor, a fiftieth resistor, a fifty-first resistor, a fifty-second resistor, a fifty-third resistor, a fifty-fourth resistor, a fifty-fifth resistor, a fifty-sixth resistor, a thirty-second capacitor, a ninth transistor, a third coupler, a fourth coupler and a voltage reference chip; a first end of the forty-sixth resistor, a first end of the forty-seventh resistor, a first end of the fiftieth resistor, a first end of the fifty-first resistor, and a first end of the fifty-second resistor as an input end of the input voltage detection sub-circuit; The collector of the ninth transistor serves as the output terminal of the input voltage detection subcircuit; The second end of the forty-sixth resistor is electrically connected to the second end of the forty-seventh resistor, the first end of the forty-eighth resistor, the first end of the forty-ninth resistor, the first end of the thirty-second capacitor, and the first pin of the voltage reference chip; The second end of the fiftieth resistor is electrically connected to the second pin of the voltage reference chip and the second end of the fourth coupler; The second end of the fifty-first resistor is electrically connected to the second end of the fifty-second resistor and the first end of the third coupler; The second end of the third coupler is electrically connected to the first end of the fourth coupler; The third end of the third coupler is electrically connected to the second end of the fifty-third resistor and the first end of the fifty-fourth resistor; The second end of the fifty-fourth resistor is electrically connected to the first end of the fifty-sixth resistor and the base of the ninth transistor; A first end of the fifty-third resistor and a second end of the fifty-fifth resistor are connected to a low voltage power supply; The third end of the fourth coupler is electrically connected to the MCU control module and the first end of the fifty-fifth resistor; The second end of the forty-eighth resistor, the second end of the forty-ninth resistor, the second end of the thirty-second capacitor, the third pin of the voltage reference chip, the fourth end of the third coupler, the fourth end of the fourth coupler, the second end of the fifty-sixth resistor and the emitter of the ninth transistor are grounded.

13. A multi-output power supply system with power-off retention function as claimed in claim 7, characterized in that: The power system monitoring circuit further includes a current acquisition module; the current acquisition module is used to collect output power current data of the output power supply and output the output power current data; The current acquisition module includes: a current acquisition chip, a multi-capacitor parallel module, an RC parallel module, a thirty-third capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a fifty-seventh resistor and a fifty-eighth resistor; The first pin of the current acquisition chip, the second pin of the current acquisition chip and the first end of the multi-capacitor parallel module are electrically connected to the first output power supply; The third pin of the current collection chip, the fourth pin of the current collection chip and the first end of the RC parallel module are electrically connected to the second output power supply; The second end of the thirty-fifth capacitor, the first end of the fifty-seventh resistor, and the first end of the fifty-eighth resistor serve as the output end of the current acquisition module; The eighth pin of the current acquisition chip and the first end of the thirty-third capacitor are connected to a low-voltage power supply; The seventh pin of the current collection chip is electrically connected to the first end of the fifty-seventh resistor; The sixth pin of the current collection chip is electrically connected to the first end of the thirty-fourth capacitor; The second end of the multi-capacitor parallel module, the second end of the RC parallel module, the second end of the thirty-third capacitor, the second end of the thirty-fourth capacitor, the second end of the thirty-fifth capacitor, the second end of the fifty-eighth resistor and the fifth pin of the current acquisition chip are grounded.

14. A multi-output power supply system with power-off retention function as claimed in claim 7, characterized in that: The power system monitoring circuit also includes a temperature acquisition module; the temperature acquisition module is used to collect the temperature of multiple output power supplies with different voltages and powers, and output temperature data, so that the MCU control module outputs a conversion control signal based on the temperature data, and controls the power output branch based on the conversion control signal; The temperature acquisition module includes: a thermistor, a current limiting resistor and a filter capacitor; The first end of the thermistor, the second end of the current limiting resistor and the first end of the filter capacitor serve as the output end of the temperature acquisition module; A first end of the current limiting resistor is connected to a low voltage power supply; A second terminal of the thermistor and a second terminal of the filter capacitor are grounded.

15. A multi-output power supply system with power-off retention function as claimed in claim 1, characterized in that: It also includes an output filter circuit, which is used to filter out high-frequency components of the output power supply; The output filter circuit comprises: a thirty-sixth capacitor, a thirty-seventh capacitor and a fourth inductor; The first end of the fourth inductor and the first end of the thirty-sixth capacitor serve as input ends of the output filter circuit; The second end of the fourth inductor and the first end of the thirty-seventh capacitor serve as an output end of the output filter circuit; A second end of the thirty-sixth capacitor and a second end of the thirty-seventh capacitor are grounded.

16. A multi-output power supply system with power-off retention function as claimed in claim 1, characterized in that: The power output branch includes a plurality of power conversion modules; The first power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply to output a first output power supply with a first preset voltage and a first preset power; The second power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply to output a second output power supply with a second preset voltage and a second preset power; The third power conversion module is used to perform voltage conversion processing on the second power supply or the energy storage power supply, and output a third output power supply with a third preset voltage and a third preset power; The fourth power conversion module is used to perform voltage conversion processing on the first power supply to output a fourth output power supply with a fourth preset voltage and a fourth preset power.

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