High-voltage constant-voltage digital power supply for oil smoke purification

Abstract

The invention discloses a high-voltage constant-voltage digital power supply for lampblack purification, which belongs to the technical field of air purification, and comprises a rectification filter circuit, an auxiliary power supply circuit for providing weak current, an MOS (Metal Oxide Semiconductor) tube isolation driving circuit for controlling power conversion, and a single chip microcomputer processing circuit for generating signals and controlling an algorithm, the high-voltage sampling circuit is used for converting a detection voltage; the communication and output interface circuit is used for transmitting a communication signal; the output indicating circuit is used for representing a power supply state; the relay state circuit is used for representing a system operation condition; the nixie tube display circuit is used for displaying the voltage in real time; and the key input circuit is used for adjusting the voltage. Through the mode, the high-voltage voltage of the lampblack electric field charge area is used as a control target to stabilize the high-voltage voltage, so that stable and efficient lampblack purification is ensured, meanwhile, nixie tube voltage display and fault code display functions are achieved, and the working state of the working voltage of the electric field is visually and conveniently checked.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, and in particular to a high-voltage constant-voltage digital power supply for oil fume purification. Background Art

[0002] In the prior art, the electrostatic fume purifier is a fume purification device that uses the principle of static electricity. It is mainly used for the purification and treatment of kitchen fume in hotels, restaurants, bars, schools, institutions, factories and other places; food frying, cooking and processing industries; oil splash heat treatment workshops, oil mist lubrication workshops, workpiece welding workshops, and industrial occasions such as olefin oil boiler emissions. The electrostatic fume purifier is one of the most widely used environmentally friendly fume purification equipment on the market.

[0003] The oil fume purification power supply is mainly divided into high-frequency purification high-voltage power supply and low-frequency oil fume purification high-voltage power supply. According to the structure, it is divided into inductive type and electronic type, among which the low-frequency inductive oil fume purification power supply has the most stable quality. In addition, the technical types of oil fume purification power supply also include constant voltage double voltage power supply, constant voltage power supply and constant power supply. The constant voltage double voltage power supply not only meets the safety protection function of the constant voltage power supply, but also prevents the risk of fire of the power supply itself; the constant voltage power supply has high safety and will not cause fire due to short circuit and no load; the constant power power supply may cause fire risk in the case of short circuit. In conventional constant voltage power supplies, analog circuits are mostly used to build high-voltage power supply circuits. The lack of participation of digital circuits cannot meet the market demand for digitalization and intelligence of oil fume purification products. In addition, the control method of traditional analog constant voltage power supply is not flexible, and the abnormal response speed is affected by the actual device differences and distributed parameters, and the consistency and reliability of the product are greatly reduced.

[0004] Based on this, the present invention designs a high-voltage constant-voltage digital power supply for oil fume purification to solve the above problems. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a high-voltage constant-voltage digital power supply for oil fume purification.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A high-voltage constant-voltage digital power supply for oil fume purification includes a rectifier filter circuit, characterized in that it also includes an auxiliary power supply circuit for providing weak current, a MOS tube isolation drive circuit for controlling power conversion, a single-chip processing circuit for generating signals and control algorithms, a high-voltage voltage doubling circuit for boosting, a high-voltage sampling circuit for converting and detecting voltage, a communication and output interface circuit for communication signal transmission, an output indication circuit for characterizing power supply status, a relay status circuit for characterizing system operation status, a digital tube display circuit for real-time display of voltage, and a key input circuit for adjusting voltage;

[0008] The rectifier and filter circuit is connected to the auxiliary power supply circuit, the MOS tube isolation drive circuit and the high-voltage voltage doubler circuit, the MOS tube isolation drive circuit is connected to the high-voltage voltage doubler circuit, the high-voltage voltage doubler circuit is connected to the high-voltage sampling circuit, the communication and output interface circuit is connected to the output indication circuit, and the single-chip microcomputer processing circuit is connected to the auxiliary power supply circuit, the high-voltage sampling circuit, the communication and output interface circuit, the relay state circuit, the digital tube display circuit and the key input circuit.

[0009] Furthermore, the rectifier filter circuit and the auxiliary power supply circuit include an interface terminal six CN6, a common mode inductor Z1, an X capacitor one C1, an X capacitor two C2, a rectifier bridge one BR1, an energy storage capacitor eight EC8, an industrial frequency step-down transformer one T1, a rectifier bridge two DB1, a filter capacitor one EC1, a three-terminal voltage regulator chip one V1 and a three-terminal voltage regulator chip two V2;

[0010] The interface terminal six CN6 is electrically connected to the external power supply 220VAC interface as a power input terminal, interface No. 1 of the interface terminal six CN6 is grounded, interface No. 2 of the interface terminal six CN6 is electrically connected to one end of a varistor six RV6, interface No. 3 of the interface terminal six CN6 is electrically connected to one end of a fuse one F1, the other end of the varistor six RV6 is electrically connected to the other end of the fuse one F1, the varistor six RV6 is connected in parallel with an X capacitor one C1, one end of the X capacitor one C1 is electrically connected to interface No. 1 of a common mode inductor Z1, the other end of the X capacitor one C1 is electrically connected to interface No. 4 of a common mode inductor one Z1, interface No. 2 of the common mode inductor one Z1 is electrically connected to interface No. 3 of a rectifier bridge one BR1, and interface No. 3 of the common mode inductor one Z1 is electrically connected to interface No. 4 of a common mode inductor one Z1. The No. 2 interface of the bridge BR1 is electrically connected, the connection circuit between the No. 2 interface of the common-mode inductor Z1 and the No. 3 interface of the rectifier bridge BR1 is electrically connected to one end of the X capacitor C2, the connection circuit between the No. 3 interface of the common-mode inductor Z1 and the No. 2 interface of the rectifier bridge BR1 is electrically connected to the other end of the X capacitor C2, the No. 4 interface of the rectifier bridge BR1 is connected to the MOS tube isolation drive circuit, the No. 1 interface of the rectifier bridge BR1 is electrically connected to one end of the +310V output interface, the other end of the +310V output interface is connected to the MOS tube isolation drive circuit, the connection circuit between the No. 1 interface of the rectifier bridge BR1 and the +310V output interface is connected to one end of the energy storage capacitor EC8, one end of the discharge resistor R7 and one end of the capacitor C5 The end is electrically connected, the other end of the energy storage capacitor EC8 is connected to the MOS tube isolation drive circuit, the other end of the discharge resistor R7 is electrically connected to one end of the discharge resistor R15, the other end of the discharge resistor R15 is connected to the MOS tube isolation drive circuit, the other end of the capacitor C5 is electrically connected to one end of the capacitor C10, the other end of the capacitor C10 is connected to the MOS tube isolation drive circuit, the connection circuit between the discharge resistor R7 and the discharge resistor R15 and the connection circuit between the capacitor C5 and the capacitor C10 is electrically connected, the connection circuit between the capacitor C5 and the capacitor C10 is electrically connected to one end of the capacitor C8, the other end of the capacitor C8 is electrically connected to the GY-1 port, and the GY-1 port is electrically connected to the high-voltage voltage doubling circuit The connection circuit between the varistor RV6 and the X capacitor C1 is electrically connected to the No. 1 interface of the power frequency step-down transformer T1, the connection circuit between the X capacitor C1 and the common mode inductor Z11 port is electrically connected to the No. 4 interface of the power frequency step-down transformer T1, the No. 8 interface of the power frequency step-down transformer T1 is electrically connected to the No. 1 interface of the rectifier bridge DB1, the No. 6 interface of the power frequency step-down transformer T1 is electrically connected to the No. 2 interface of the rectifier bridge DB1, the No. 3 interface of the rectifier bridge DB1 is electrically connected to the No. 1 interface of the three-terminal voltage regulator chip V1, the No. 4 port of the rectifier bridge DB1 is grounded, and the connection circuit between the No. 3 interface of the rectifier bridge DB1 and the No. 1 interface of the three-terminal voltage regulator chip V1 is electrically connected to one end of the energy storage capacitor EC1.The other end of the energy storage capacitor EC1 is grounded, the No. 2 interface of the three-terminal voltage regulator chip V1 is grounded, the No. 3 interface of the three-terminal voltage regulator chip V1 is electrically connected to the No. 3 interface of the three-terminal voltage regulator chip V2, the connection circuit between the No. 3 interface of the three-terminal voltage regulator chip V1 and the No. 3 interface of the three-terminal voltage regulator chip V2 is electrically connected to one end of the capacitor C3 and one end of the energy storage capacitor EC3, the other end of the capacitor C3 and the energy storage capacitor EC3 is grounded, the connection circuit between the capacitor C3 and the energy storage capacitor EC3 is electrically connected to one end of the +15V output interface, and the other end of the +15V output interface is connected to the MOS tube The isolation drive circuit, the communication and output interface circuit and the output indication circuit are connected, the No. 2 interface of the three-terminal voltage regulator chip V2 is grounded, the No. 1 interface of the three-terminal voltage regulator chip V2 is electrically connected to one end of the energy storage capacitor EC2, the other end of the energy storage capacitor EC2 is grounded, the connection circuit between the No. 1 interface of the three-terminal voltage regulator chip V2 and the energy storage capacitor EC2 is electrically connected to one end of the +5V output interface and one end of the capacitor C4, the other end of the +5V output interface is connected to the single-chip processing circuit, the high-voltage sampling circuit, the communication and output interface circuit, and the digital tube display circuit, and the other end of the capacitor C4 is grounded.

[0011] Furthermore, the MOS tube isolation driving circuit includes a driving chip 2 U2, an isolation transformer 3 T3, a DC blocking capacitor 7 C7, a current limiting damping resistor 54 R54, a current limiting damping resistor 57 R57, a MOS tube 4 V4 and a MOS tube 5 V5;

[0012] Interface No. 1 and interface No. 3 of the driving chip U2 are grounded, interface No. 2 of the driving chip U2 is electrically connected to one end of the resistor R13, the other end of the resistor R13 is electrically connected to the P1_0 port, interface No. 4 of the driving chip U2 is electrically connected to one end of the resistor R14, the other end of the resistor R14 is electrically connected to the P3_7 port, the P1_0 port and the P3_7 port are connected to the single-chip microcomputer processing circuit, interface No. 5 of the driving chip U2 is electrically connected to interface No. 5 of the isolation transformer T3, interface No. 6 of the driving chip U2 is electrically connected to one end of the capacitor C11, and the connection circuit between interface No. 6 of the driving chip U2 and the capacitor C11 is connected to one end of the energy storage capacitor EC6 and +1 The 5V output interface is electrically connected, the other end of the capacitor C11 and the other end of the energy storage capacitor EC6 are grounded, the No. 7 interface of the driving chip U2 is electrically connected to one end of the DC-isolating capacitor C7, the other end of the DC-isolating capacitor C7 is electrically connected to the No. 2 interface of the isolation transformer T3, the No. 8 interface of the driving chip U2 is grounded, the connection circuit between the DC-isolating capacitor C7 and the No. 2 interface of the isolation transformer T3 is electrically connected to one end of the resistor R12, the other end of the resistor R12 is electrically connected to one end of the capacitor C9, the connection circuit between the No. 5 interface of the driving chip U2 and the No. 5 interface of the isolation transformer T3 is electrically connected to the other end of the capacitor C9, and the No. 6 interface of the isolation transformer T3 is connected to the rectifier bridge BR 1, interface No. 4 of isolation transformer T3 is electrically connected, interface No. 7 of isolation transformer T3 is electrically connected to one end of current limiting damping resistor Fifty-Seven R57, the other end of current limiting damping resistor Fifty-Seven R57 is electrically connected to the gate of MOS tube V5, the connection circuit between interface No. 7 of isolation transformer T3 and current limiting damping resistor Fifty-Seven R57 is electrically connected to the negative electrode of diode Nine D9, the connection circuit between current limiting damping resistor Fifty-Seven R57 and the gate of MOS tube V5 is electrically connected to the positive electrode of diode Nine D9, the positive electrode of voltage stabilizing diode D10 and one end of resistor Eighteen R18, the positive electrode of voltage stabilizing diode D10 is electrically connected to the negative electrode of voltage stabilizing diode eleven D11, the positive electrode of voltage stabilizing diode eleven D11 is electrically connected to the positive electrode of energy storage capacitor Eight EC8 The other end is electrically connected, the other end of the resistor R18 is electrically connected to the other end of the discharge resistor R15, the source of the MOS tube V5 is electrically connected to the other end of the capacitor C10, the No. 9 interface of the isolation transformer T3 is electrically connected to the GY-2 port, the GY-2 port is electrically connected to the high-voltage voltage doubling circuit, the connection circuit between the No. 9 interface of the isolation transformer T3 and the GY-2 port is electrically connected to the positive electrode of the voltage-stabilizing diode D8, one end of the resistor R10, the drain of the MOS tube V5 and the source of the MOS tube V4, the No. 10 interface of the isolation transformer T3 is electrically connected to one end of the current limiting damping resistor R54, the other end of the current limiting damping resistor R54 is electrically connected to the gate of the MOS tube V4,The connection circuit between the No. 10 interface of the isolation transformer three T3 and the current limiting damping resistor fifty-four R54 is electrically connected to the cathode of the diode six D6, the connection circuit between the current limiting damping resistor fifty-four R54 and the gate of the MOS tube four V4 is electrically connected to the anode of the diode six D6, the anode of the voltage stabilizing diode seven D7 and the other end of the resistor ten R10, the cathode of the voltage stabilizing diode seven D7 is electrically connected to the cathode of the voltage stabilizing diode eight D8, and the drain of the MOS tube four V4 is electrically connected to the +310V output interface.

[0013] Furthermore, the single-chip processing circuit includes a single-chip microcomputer U3, a program burning port CN5, a capacitor C6 and a thermistor RT1;

[0014] Pin No. 19 of the single-chip microcomputer U3 is electrically connected to the P1_0 port, Pin No. 18 of the single-chip microcomputer U3 is electrically connected to the P3_7 port, Pin No. 8 of the single-chip microcomputer U3 is electrically connected to the +5V output interface, the connection circuit between Pin No. 8 of the single-chip microcomputer U3 and the +5V output interface is electrically connected to one end of capacitor C27, one end of capacitor C13 and one end of varistor RV2, the other end of capacitor C27, the other end of capacitor C13 and the other end of varistor RV2 are grounded, Pin No. 10 of the single-chip microcomputer U3 is grounded, Pin No. 11 of the single-chip microcomputer U3 is electrically connected to one end of resistor R24, the other end of resistor R24 ​​is electrically connected to the RXD port, the RXD port is electrically connected to port 3 of the program burning port CN5, Pin No. 12 of the single-chip microcomputer U3 is electrically connected to resistor R21 One end of resistor R21 is electrically connected, the other end of resistor R21 is electrically connected to the TXD port, the TXD port is electrically connected to port No. 4 of the program burning port CN5, pin No. 20 of the single-chip computer U3 is electrically connected to one end of resistor R11, the other end of resistor R11 is electrically connected to one end of thermistor RT1, the other end of thermistor RT1 is grounded, the connection circuit between resistor R11 and thermistor RT1 is electrically connected to one end of resistor R9 and one end of capacitor C6, the other end of resistor R9 is electrically connected to the +5V output interface, the other end of capacitor C6 is grounded, port No. 1 of the program burning port CN5 is electrically connected to the +5V output interface, port No. 2 of the program burning port CN5 is grounded, and the single-chip computer U3 is connected to the high-voltage sampling circuit, the communication and output interface circuit, the output indication circuit and the digital tube display circuit.

[0015] Furthermore, the high voltage voltage doubling circuit includes a voltage doubling transformer T4, an interface terminal four CN4, a high voltage rectifier bridge three BR3, a ceramic resistor R50 and a three-terminal voltage stabilizing chip three V3;

[0016] Interface No. 1 of the voltage doubler transformer T4 is electrically connected to the CN4-6 port of the interface terminal CN4, the CN4-6 port is electrically connected to the GY-1 port, interface No. 2 of the voltage doubler transformer T4 is electrically connected to the CN4-5 port of the interface terminal CN4, the CN4-5 port is electrically connected to the GY-2 port, interface No. 3 of the voltage doubler transformer T4 is electrically connected to the CN4-1 port of the interface terminal CN4, the CN4-1 port of the interface terminal CN4 is electrically connected to the negative pole of the diode D3, interface No. 4 of the voltage doubler transformer T4 is electrically connected to the CN4-2 port of the interface terminal CN4, the CN4-2 port is electrically connected to the negative pole of the diode D2, interface No. 5 of the voltage doubler transformer T4 is electrically connected to the CN4-2 port of the interface terminal CN4, the CN4-2 port is electrically connected to the negative pole of the diode D2, interface No. 6 of the voltage doubler transformer T4 is electrically connected to the CN4-3 port of the high-voltage rectifier bridge BR3, and the CN4-4 port is electrically connected to the CN4-5 port of the interface terminal CN4. The port is electrically connected, the No. 6 interface and the No. 7 interface of the voltage doubling transformer T4 are electrically connected to the negative electrode of the diode thirteen D13, the positive electrode of the diode thirteen D13 is electrically connected to the LV port, the No. 8 interface of the voltage doubling transformer T4 is electrically connected to the No. 3 interface of the high-voltage rectifier bridge three BR3, the No. 1 interface of the high-voltage rectifier bridge three BR3 is electrically connected to the HV port, the connection circuit between the No. 1 interface of the high-voltage rectifier bridge three BR3 and the HV port is electrically connected to one end of the ceramic resistor R50, the other end of the ceramic resistor R50 is electrically connected to the CN4-3 port of the interface terminal four CN4, the No. 4 interface of the high-voltage rectifier bridge three BR3 is electrically connected to the CN4-4 port of the interface terminal four CN4, the CN4-3 port of the interface terminal four CN4 is connected to the BY-3 port, and the BY- -3 port is connected to the high-voltage sampling circuit, the CN4-4 port of the interface terminal four CN4 is connected to the BY-2 port, the anode of the diode two D2 and the anode of the diode three D3 are electrically connected to the No. 2 port of the interface terminal three CN3, the connection circuit between the anode of the diode three D3 and the No. 2 port of the interface terminal three CN3 is electrically connected to one end of the energy storage capacitor four EC4, the No. 2 port of the three-terminal voltage regulator chip three V3 and one end of the energy storage capacitor five EC5, the connection circuit between the CN4-1 port of the interface terminal four CN4 and the diode three D3 is electrically connected to the anode of the diode four D4, the connection circuit between the CN4-2 port of the interface terminal four CN4 and the diode two D2 is electrically connected to the anode of the diode five D5, and the cathode of the diode four D4 The cathode of diode five D5 is electrically connected to interface No. 1 of three-terminal voltage regulator chip three V3, the connection circuit between the cathode of diode five D5 and interface No. 1 of three-terminal voltage regulator chip three V3 is electrically connected to the other end of energy storage capacitor four EC4, interface No. 3 of three-terminal voltage regulator chip three V3 is electrically connected to port No. 1 of interface terminal two CN2, the connection circuit between interface No. 3 of three-terminal voltage regulator chip three V3 and port No. 1 of interface terminal two CN2 is electrically connected to the other end of energy storage capacitor five EC5 and port No. 1 of interface terminal three CN3, port No. 2 of interface terminal two CN2 is electrically connected to port No. 2 of interface terminal three CN3, and ports No. 1 and No. 2 of interface terminal two CN2 and interface terminal three CN3 are electrically connected to the +12V output interface respectively.

[0017] Furthermore, the high voltage sampling circuit includes an inductor L1, a capacitor C19, a variable resistor VR1, a varistor RV3, an operational amplifier U4-A and a resistor R25;

[0018] One end of the inductor L1 is electrically connected to the BY-3 port, the other end of the inductor L1 is electrically connected to one end of the resistor R30, the connection circuit between the inductor L1 and the resistor R30 is electrically connected to one end of the capacitor C19 and one end of the fixed end of the variable resistor VR1, the other end of the capacitor C19 and the other end of the fixed end of the variable resistor VR1 are grounded, the other end of the resistor R30 is electrically connected to one end of the resistor R29, the connection circuit between the resistor R30 and the resistor R29 is electrically connected to the variable resistor The sliding end of resistor VR1 is electrically connected to one end of capacitor C18, the other end of capacitor C18 is grounded, the other end of resistor R29 is electrically connected to one end of varistor RV3, the other end of varistor RV3 is grounded, the connection circuit between resistor R29 and varistor RV3 is electrically connected to port No. 2 of operational amplifier U4-A, port No. 2 of operational amplifier U4-A is electrically connected to one end of resistor R28, port No. 2 of operational amplifier U4-A is electrically connected to resistor R28 The connection circuit between is electrically connected to one end of capacitor 20 C20, the other end of capacitor 20 C20 is electrically connected to interface No. 1 of operational amplifier 4 U4-A, the connection circuit between capacitor 20 R20 and interface No. 1 of operational amplifier 4 U4-A is electrically connected to the other end of resistor 28 R28 and one end of resistor 27 R27, the other end of resistor 27 R27 is electrically connected to port P1_7, port P1_7 is electrically connected to pin No. 6 of microcontroller 3 U3, the connection circuit between resistor 28 R28 and resistor 27 R27 ... The circuit is electrically connected to one end of capacitor C17, the other end of capacitor C17 is grounded, interface No. 3 of operational amplifier U4-A is electrically connected to one end of resistor R25, the other end of resistor R25 is grounded, interface No. 4 of operational amplifier U4-A is grounded, interface No. 8 of operational amplifier U4-A is electrically connected to one end of capacitor C15, the other end of capacitor C15 is grounded, and the connecting circuit between interface No. 8 of operational amplifier U4-A and capacitor C15 is electrically connected to the +5V output interface.

[0019] Furthermore, the communication and output interface circuit includes a resistor R2, a driver chip U7, a transistor Q1, a voltage regulator diode TVS3, a voltage regulator diode TVS4 and an interface terminal CN1;

[0020] One end of the resistor R2 is electrically connected to the TXD port, the other end of the resistor R2 is electrically connected to the base of the transistor Q1, the emitter of the transistor Q1 is electrically connected to the +5V output interface, the collector of the transistor Q1 is electrically connected to pin 2 of the driver chip U7, the connection circuit between the collector of the transistor Q1 and pin 2 of the driver chip U7 is electrically connected to one end of the resistor R43, pin 1 of the driver chip U7 is electrically connected to the RXD port, the connection circuit between pin 2 of the driver chip U7 and the resistor R43 is electrically connected to the driver chip Pin 3 of U7 is electrically connected, pin 4 of driver chip U7 is electrically connected to the TXD port, the other end of resistor R43 is grounded, pin 5 of driver chip U7 is grounded, pin 6 of driver chip U7 is electrically connected to port 485A, the connection circuit between pin 6 of driver chip U7 and port 485A is electrically connected to the negative electrode of voltage regulator diode TVS4, pin 7 of driver chip U7 is electrically connected to port 485B, the connection circuit between pin 7 of driver chip U7 and port 485B is electrically connected to one end of resistor R46 and voltage regulator diode TVS4. The cathode of the diode three TVS3 is electrically connected, the other end of the resistor forty-six R46, the anode of the voltage zener diode four TVS4 and the anode of the voltage zener diode three TVS3 are grounded, the connection circuit between the 485A port and the voltage zener diode four TVS4 is electrically connected to one end of the resistor forty-five R45 and one end of the resistor forty-four R44, the connection circuit between the 485B port and the voltage zener diode three TVS3 is electrically connected to the other end of the resistor forty-five R45, the No. 8 pin of the driver chip seven U7 is electrically connected to the other end of the resistor forty-four R44, the No. 8 pin of the driver chip seven U7 is electrically connected to the resistor four The connection circuit between fourteen R44 is electrically connected to the +5V output interface and one end of capacitor sixteen C16, the other end of capacitor sixteen C16 is grounded, port No. 1 of interface terminal CN1 is electrically connected to port 485B, port No. 2 of interface terminal CN1 is electrically connected to port 485A, port No. 7 of interface terminal CN1 is electrically connected to the WASH port, port No. 8 of interface terminal CN1 is electrically connected to the ERR port, port No. 9 of interface terminal CN1 is electrically connected to the WORK port, and port No. 10 of interface terminal CN1 is electrically connected to the +15V output interface.

[0021] Furthermore, the output indication circuit includes a driving chip U1, an indicator light LED2 and a resistor R1;

[0022] Pin No. 1 of the driver chip U1 is electrically connected to the P5_5_R port, the P5_5_R port is electrically connected to pin No. 9 of the single-chip microcomputer U3, pin No. 2 of the driver chip U1 is electrically connected to the P1_6 port, the P1_6 port is electrically connected to pin No. 5 of the single-chip microcomputer U3, pin No. 3 of the driver chip U1 is electrically connected to the P1_4 port, the P1_4 port is electrically connected to pin No. 3 of the single-chip microcomputer U3, pin No. 4 of the driver chip U1 is electrically connected to the P1_3_G port, the P1_3_G port is electrically connected to pin No. 2 of the single-chip microcomputer U3, pin No. 4 of the driver chip U1 is electrically connected to the P1_3_G port, the P1_3_G port is electrically connected to pin No. 2 of the single-chip microcomputer U3, and pin No. 4 of the driver chip U1 is electrically connected to the P1_4 port. The connection circuit between the pin and the P1_3_G port is electrically connected to the No. 6 pin of the driver chip U1, the No. 5 pin of the driver chip U1 is electrically connected to the P1_2_Y port, the P1_2_Y port is electrically connected to the No. 1 pin of the single-chip computer U3, the connection circuit between the No. 5 pin of the driver chip U1 and the P1_2_Y port is electrically connected to the No. 7 pin of the driver chip U1, the No. 8 pin of the driver chip U1 is grounded, the No. 9 pin of the driver chip U1 is electrically connected to the +15V output interface, the No. 10 pin of the driver chip U1 is electrically connected to one end of the resistor R5, the other end of the resistor R5 One end is electrically connected to the WASH port, the 11th pin of the driver chip U1 is electrically connected to one end of the resistor R6, the other end of the resistor R6 is electrically connected to the WORK port, the 12th pin of the driver chip U1 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the positive electrode of the indicator light LED3, the negative electrode of the indicator light LED3 is electrically connected to the +15V output interface, the 13th pin of the driver chip U1 is electrically connected to one end of the resistor R4, the other end of the resistor R4 is electrically connected to the positive electrode of the indicator light LED2, the negative electrode of the indicator light LED2 is electrically connected to the +15V The output interface is electrically connected, pin 16 of the driving chip U1 is electrically connected to one end of the resistor R1, the other end of the resistor R1 is connected to the ERR port, the P5_5_R port is electrically connected to one end of the resistor R23, the other end of the resistor R23 is electrically connected to the positive pole of the indicator light LED4, the negative pole of the indicator light LED4 is grounded, the P5_4 port is electrically connected to one end of the resistor R20, the P5_4 port is electrically connected to pin 7 of the microcontroller U3, the other end of the resistor R20 is electrically connected to the positive pole of the indicator light LED5, and the negative pole of the indicator light LED5 is grounded.

[0023] Furthermore, the relay state circuit includes two groups of relays, the output ports of the two groups of relays are respectively electrically connected to the ports of the single-chip computer U3, and the connectors of the two groups of relays are respectively electrically connected to the power input terminals of the external devices.

[0024] Furthermore, the digital tube display circuit includes a driving chip U5, a digital tube LED6, an energy storage capacitor EC7 and a capacitor C22;

[0025] Interface No. 1 of the driver chip U5 is electrically connected to the DIG1 port, interface No. 2 of the driver chip U5 is electrically connected to one end of resistor R38, the other end of resistor R38 is electrically connected to the P3_4 port, the P3_4 port is electrically connected to pin No. 15 of the single-chip microcomputer U3, interface No. 3 of the driver chip U5 is electrically connected to one end of resistor R36, the other end of resistor R36 is electrically connected to the P3_5 port, the P3_5 port is electrically connected to pin No. 16 of the single-chip microcomputer U3, interface No. 4 of the driver chip U5 is grounded, interface No. 5 of the driver chip U5 is electrically connected to the DIG2 port, and the DIG1 port is electrically connected to the P3_5 port. The interface No. 6 of the driving chip U5 is electrically connected to the DIG3 port, the interface No. 7 of the driving chip U5 is electrically connected to the DIG4 port, the interface No. 8 of the driving chip U5 is electrically connected to the DIG2 port, the interface No. 9 of the driving chip U5 is electrically connected to the B port, the interface No. 10 of the driving chip U5 is electrically connected to the +5V output interface, the connection circuit between the interface No. 10 of the driving chip U5 and the +5V output interface is electrically connected to one end of the energy storage capacitor EC7, the connection circuit between the interface No. 10 of the driving chip U5 and the energy storage capacitor EC7 is electrically connected to one end of the capacitor C22, and the energy storage capacitor The other end of EC7 and the other end of capacitor C22 are grounded, interface No. 11 of driver chip U5 is electrically connected to C port, interface No. 12 of driver chip U5 is electrically connected to D port, interface No. 13 of driver chip U5 is electrically connected to E port, interface No. 14 of driver chip U5 is electrically connected to F port, interface No. 15 of driver chip U5 is electrically connected to G port, interface No. 16 of driver chip U5 is electrically connected to DP port, interface No. 1 of digital tube LED6 is electrically connected to E port, interface No. 2 of digital tube LED6 is electrically connected to D port, and interface No. 3 of digital tube LED6 is electrically connected to DP port. The port is electrically connected, interface No. 4 of the six digital tube LED6 is electrically connected to the C port, interface No. 5 of the six digital tube LED6 is electrically connected to the G port, interface No. 6 of the six digital tube LED6 is electrically connected to the DIG4 port, interface No. 7 of the six digital tube LED6 is electrically connected to the B port, interface No. 8 of the six digital tube LED6 is electrically connected to the DIG3 port, interface No. 9 of the six digital tube LED6 is electrically connected to the DIG2 port, interface No. 10 of the six digital tube LED6 is electrically connected to the F port, interface No. 11 of the six digital tube LED6 is electrically connected to the A port, and interface No. 12 of the six digital tube LED6 is electrically connected to the DIG1 port.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the rectifier filter circuit converts 220V AC power into DC power for use in the high-voltage digital power supply, the auxiliary power supply circuit supplies power to the weak current part of the digital power supply, the MOS tube isolation drive circuit cooperates with the rectifier filter circuit and the high-voltage voltage doubler circuit to form a half-bridge resonant circuit, the half-bridge resonant circuit converts the rectified DC power into controlled AC power and sends it to the high-voltage voltage doubler circuit to complete the power conversion from low voltage to high voltage, the single-chip microcomputer processing circuit is responsible for the pwm signal generation, high-voltage output voltage sampling and display, key, and status output processing of the half-bridge circuit, and also includes the control algorithm implementation and ignition and short circuit abnormal processing during the operation of the high-voltage power supply, the communication and output interface circuit cooperates with the output indication circuit to use different colors of the indicator light to represent the power supply operation status and fault reminder, the relay status circuit externally represents the system operation status and fault information, the digital tube display circuit displays the high-voltage output voltage in real time, and displays the fault code when a fault occurs, the key input circuit switches the digital tube display content, and adjusts the set voltage;

[0027] 2. When the present invention is used, after 220V AC power is input, the common-mode inductor Z1 suppresses the common-mode interference signal, the X-capacitor C1 and the X-capacitor C2 filter the differential-mode interference signal on the power line, the rectifier bridge BR1 converts the AC power into DC power, and the energy storage capacitor EC8 smoothes the DC power by charging and discharging to reduce voltage fluctuations; the power frequency step-down transformer T1 reduces the higher power frequency AC voltage to a voltage value suitable for subsequent circuits. In order to maintain the stability of the auxiliary power supply, a three-terminal voltage regulator chip V1 and a three-terminal voltage regulator chip V2 are selected to output 15V and 5V voltages for use by the single-chip microcomputer and the weak current circuit respectively;

[0028] 3. When the present invention is used, MOS tube four V4 and MOS tube five V5 are power transmission control bridge arms, and cooperate with their connection ends and the high-voltage voltage doubling circuit to form a half-bridge resonant circuit for power transmission, thereby reducing the switching loss in the circuit and improving the power density; the single-chip microcomputer three U3 collects high-voltage voltage information through the internal ADC module, and processes the key information, the digital tube content display, and the generation of upper and lower bridge arm drive signals of MOS tube four V4 and MOS tube five V5 at the same time;

[0029] 4. When the present invention is used, the voltage of the half-bridge resonant circuit is increased to a higher voltage in this part, and the ceramic resistor R50 divides the high voltage to complete the low voltage to high voltage conversion; the inductor L1 and the capacitor C19 are used as LC filter circuits for filtering, and the variable resistor VR1 can adjust its resistance to calibrate the sampled high voltage value, and the operational amplifier U4-A, the resistor R25, the resistor R28, the capacitor C17 and the capacitor C20 form an active filter circuit to make the collected high voltage signal cleaner and have a strong anti-interference ability. At the same time, this part converts the 10-20kV high voltage into a 0-5V signal that can be detected by the single-chip microcomputer U3;

[0030] 5. When the present invention is in use, the power supply operation status is represented by red, green and yellow light indications. The working status is green, the cleaning status is yellow, and the fault status is red, so real-time monitoring is achieved. The two groups of relays can automatically connect and disconnect the circuit according to the change of input voltage, realize automatic control of circuit cleaning and faults, and represent the system operation status and fault information externally. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a module block diagram of a high-voltage constant-voltage digital power supply for oil fume purification of the present invention;

[0033] Figure 2 It is the electrical connection diagram of the high voltage power supply and the electric field load;

[0034] Figure 3 It is the system block diagram of the rectifier filter circuit and the auxiliary power supply circuit;

[0035] Figure 4 This is the system block diagram of the MOS tube isolation drive circuit;

[0036] Figure 5 It is the system block diagram of the single chip microcomputer processing circuit;

[0037] Figure 6 A local system frame for a high voltage doubler circuit Figure 1 ;

[0038] Figure 7 A local system frame for a high voltage doubler circuit Figure 2 ;

[0039] Figure 8It is the system block diagram of the high voltage sampling circuit;

[0040] Fig. 9 It is the system block diagram of the communication and output interface circuit;

[0041] Fig.10 It is the system block diagram of the output indication circuit;

[0042] Fig.11 This is the system block diagram of the digital tube display circuit;

[0043] Fig.12 This is the system block diagram of the key input circuit. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0045] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1-Figure 10 , a high-voltage constant-voltage digital power supply for oil fume purification, including a rectifier filter circuit, an auxiliary power supply circuit for providing weak current, a MOS tube isolation drive circuit for controlling power conversion, a single-chip microcomputer processing circuit for generating signals and control algorithms, a high-voltage voltage multiplier circuit for boosting, a high-voltage sampling circuit for converting and detecting voltage, a communication and output interface circuit for communication signal transmission, an output indication circuit for representing the power supply state, a relay state circuit for representing the system operation status, a digital tube display circuit for real-time display of voltage, and a key input circuit for adjusting voltage;

[0046] The rectifier and filter circuit is connected to the auxiliary power supply circuit, the MOS tube isolation drive circuit and the high-voltage voltage doubler circuit, the MOS tube isolation drive circuit is connected to the high-voltage voltage doubler circuit, the high-voltage voltage doubler circuit is connected to the high-voltage sampling circuit, the communication and output interface circuit is connected to the output indication circuit, and the single-chip microcomputer processing circuit is connected to the auxiliary power supply circuit, the high-voltage sampling circuit, the communication and output interface circuit, the relay state circuit, the digital tube display circuit and the key input circuit.

[0047] When the present invention is used, the rectifier and filter circuit converts 220V AC power into DC power for use in the high-voltage digital power supply, the auxiliary power supply circuit supplies power to the weak current part of the digital power supply, the MOS tube isolation drive circuit cooperates with the rectifier and filter circuit and the high-voltage voltage doubler circuit to form a half-bridge resonant circuit, the half-bridge resonant circuit converts the rectified DC power into controlled AC power and sends it to the high-voltage voltage doubler circuit to complete the power conversion from low voltage to high voltage, the single-chip microcomputer processing circuit is responsible for the PWM signal generation, high-voltage output voltage sampling and display, key, and status output processing of the half-bridge circuit, and also includes the control algorithm implementation and ignition and short circuit abnormal processing during the operation of the high-voltage power supply, the communication and output interface circuit cooperates with the output indication circuit to use different colors of the indicator light to represent the power supply operation status and fault reminder, the relay status circuit externally represents the system operation status and fault information, the digital tube display circuit displays the high-voltage output voltage in real time, and displays the fault code when a fault occurs, and the key input circuit switches the digital tube display content and adjusts the set voltage.

[0048] The rectifier filter circuit and the auxiliary power supply circuit include an interface terminal six CN6, a common mode inductor Z1, an X capacitor one C1, an X capacitor two C2, a rectifier bridge one BR1, an energy storage capacitor eight EC8, an industrial frequency step-down transformer one T1, a rectifier bridge two DB1, a filter capacitor one EC1, a three-terminal voltage regulator chip one V1 and a three-terminal voltage regulator chip two V2;

[0049] The interface terminal six CN6 is electrically connected to the external power supply 220VAC interface as a power input terminal, interface No. 1 of the interface terminal six CN6 is grounded, interface No. 2 of the interface terminal six CN6 is electrically connected to one end of a varistor six RV6, interface No. 3 of the interface terminal six CN6 is electrically connected to one end of a fuse one F1, the other end of the varistor six RV6 is electrically connected to the other end of the fuse one F1, the varistor six RV6 is connected in parallel with an X capacitor one C1, one end of the X capacitor one C1 is electrically connected to interface No. 1 of a common mode inductor Z1, the other end of the X capacitor one C1 is electrically connected to interface No. 4 of a common mode inductor one Z1, interface No. 2 of the common mode inductor one Z1 is electrically connected to interface No. 3 of a rectifier bridge one BR1, and interface No. 3 of the common mode inductor one Z1 is electrically connected to interface No. 4 of a common mode inductor one Z1. The No. 2 interface of the bridge BR1 is electrically connected, the connection circuit between the No. 2 interface of the common-mode inductor Z1 and the No. 3 interface of the rectifier bridge BR1 is electrically connected to one end of the X capacitor C2, the connection circuit between the No. 3 interface of the common-mode inductor Z1 and the No. 2 interface of the rectifier bridge BR1 is electrically connected to the other end of the X capacitor C2, the No. 4 interface of the rectifier bridge BR1 is connected to the MOS tube isolation drive circuit, the No. 1 interface of the rectifier bridge BR1 is electrically connected to one end of the +310V output interface, the other end of the +310V output interface is connected to the MOS tube isolation drive circuit, the connection circuit between the No. 1 interface of the rectifier bridge BR1 and the +310V output interface is connected to one end of the energy storage capacitor EC8, one end of the discharge resistor R7 and one end of the capacitor C5 The end is electrically connected, the other end of the energy storage capacitor EC8 is connected to the MOS tube isolation drive circuit, the other end of the discharge resistor R7 is electrically connected to one end of the discharge resistor R15, the other end of the discharge resistor R15 is connected to the MOS tube isolation drive circuit, the other end of the capacitor C5 is electrically connected to one end of the capacitor C10, the other end of the capacitor C10 is connected to the MOS tube isolation drive circuit, the connection circuit between the discharge resistor R7 and the discharge resistor R15 and the connection circuit between the capacitor C5 and the capacitor C10 is electrically connected, the connection circuit between the capacitor C5 and the capacitor C10 is electrically connected to one end of the capacitor C8, the other end of the capacitor C8 is electrically connected to the GY-1 port, and the GY-1 port is electrically connected to the high-voltage voltage doubling circuit The connection circuit between the varistor RV6 and the X capacitor C1 is electrically connected to the No. 1 interface of the power frequency step-down transformer T1, the connection circuit between the X capacitor C1 and the common mode inductor Z11 port is electrically connected to the No. 4 interface of the power frequency step-down transformer T1, the No. 8 interface of the power frequency step-down transformer T1 is electrically connected to the No. 1 interface of the rectifier bridge DB1, the No. 6 interface of the power frequency step-down transformer T1 is electrically connected to the No. 2 interface of the rectifier bridge DB1, the No. 3 interface of the rectifier bridge DB1 is electrically connected to the No. 1 interface of the three-terminal voltage regulator chip V1, the No. 4 port of the rectifier bridge DB1 is grounded, and the connection circuit between the No. 3 interface of the rectifier bridge DB1 and the No. 1 interface of the three-terminal voltage regulator chip V1 is electrically connected to one end of the energy storage capacitor EC1.The other end of the energy storage capacitor EC1 is grounded, the No. 2 interface of the three-terminal voltage regulator chip V1 is grounded, the No. 3 interface of the three-terminal voltage regulator chip V1 is electrically connected to the No. 3 interface of the three-terminal voltage regulator chip V2, the connection circuit between the No. 3 interface of the three-terminal voltage regulator chip V1 and the No. 3 interface of the three-terminal voltage regulator chip V2 is electrically connected to one end of the capacitor C3 and one end of the energy storage capacitor EC3, the other end of the capacitor C3 and the energy storage capacitor EC3 is grounded, the connection circuit between the capacitor C3 and the energy storage capacitor EC3 is electrically connected to one end of the +15V output interface, the other end of the +15V output interface is connected to the MOS tube isolation drive circuit, the communication and output interface circuit and the output indication circuit, the No. 2 interface of the three-terminal voltage regulator chip V2 is grounded, the No. 1 interface of the three-terminal voltage regulator chip V2 is connected to the energy storage capacitor EC2 One end of the three-terminal voltage regulator chip V2 is electrically connected, the other end of the energy storage capacitor EC2 is grounded, the connection circuit between the No. 1 interface of the three-terminal voltage regulator chip V2 and the energy storage capacitor EC2 is electrically connected to one end of the +5V output interface and one end of the capacitor C4, the other end of the +5V output interface is connected to the single-chip processing circuit, the high-voltage sampling circuit, the communication and output interface circuit, and the digital tube display circuit, the other end of the capacitor C4 is grounded, the model of the interface terminal CN6 is set to JCWV-5.08-3P, the model of the varistor RV6 is set to 10D471, the model of the rectifier bridge BR1 is set to KBU810, the model of the rectifier bridge DB1 is set to MB10SK, the model of the three-terminal voltage regulator chip V1 is set to L7815CV, and the model of the three-terminal voltage regulator chip V2 is set to L78L05. ,

[0050] When the present invention is used, after 220V alternating current is input, the common mode inductor Z1 suppresses the common mode interference signal, the X capacitor C1 and the X capacitor C2 filter the differential mode interference signal on the power line, the rectifier bridge BR1 converts the alternating current into direct current, and the energy storage capacitor EC8 smoothes the direct current through charging and discharging to reduce voltage fluctuations; the industrial frequency step-down transformer T1 reduces the higher industrial frequency alternating voltage to a voltage value suitable for subsequent circuits. In order to maintain the stability of the auxiliary power supply, a three-terminal voltage stabilizing chip V1 and a three-terminal voltage stabilizing chip V2 are selected to output 15V and 5V voltages for use by the single-chip microcomputer and the weak current circuit respectively.

[0051] The MOS tube isolation driving circuit includes a driving chip U2, an isolation transformer T3, a DC blocking capacitor C7, a current limiting damping resistor R54, a current limiting damping resistor R57, a MOS tube V4 and a MOS tube V5.

[0052] Interface No. 1 and interface No. 3 of the driving chip U2 are grounded, interface No. 2 of the driving chip U2 is electrically connected to one end of the resistor R13, the other end of the resistor R13 is electrically connected to the P1_0 port, interface No. 4 of the driving chip U2 is electrically connected to one end of the resistor R14, the other end of the resistor R14 is electrically connected to the P3_7 port, the P1_0 port and the P3_7 port are connected to the single-chip microcomputer processing circuit, interface No. 5 of the driving chip U2 is electrically connected to interface No. 5 of the isolation transformer T3, interface No. 6 of the driving chip U2 is electrically connected to one end of the capacitor C11, and the connection circuit between interface No. 6 of the driving chip U2 and the capacitor C11 is connected to one end of the energy storage capacitor EC6 and +1 The 5V output interface is electrically connected, the other end of the capacitor C11 and the other end of the energy storage capacitor EC6 are grounded, the No. 7 interface of the driving chip U2 is electrically connected to one end of the DC-isolating capacitor C7, the other end of the DC-isolating capacitor C7 is electrically connected to the No. 2 interface of the isolation transformer T3, the No. 8 interface of the driving chip U2 is grounded, the connection circuit between the DC-isolating capacitor C7 and the No. 2 interface of the isolation transformer T3 is electrically connected to one end of the resistor R12, the other end of the resistor R12 is electrically connected to one end of the capacitor C9, the connection circuit between the No. 5 interface of the driving chip U2 and the No. 5 interface of the isolation transformer T3 is electrically connected to the other end of the capacitor C9, and the No. 6 interface of the isolation transformer T3 is connected to the rectifier bridge BR 1, interface No. 4 of isolation transformer T3 is electrically connected, interface No. 7 of isolation transformer T3 is electrically connected to one end of current limiting damping resistor Fifty-Seven R57, the other end of current limiting damping resistor Fifty-Seven R57 is electrically connected to the gate of MOS tube V5, the connection circuit between interface No. 7 of isolation transformer T3 and current limiting damping resistor Fifty-Seven R57 is electrically connected to the negative electrode of diode Nine D9, the connection circuit between current limiting damping resistor Fifty-Seven R57 and the gate of MOS tube V5 is electrically connected to the positive electrode of diode Nine D9, the positive electrode of voltage stabilizing diode D10 and one end of resistor Eighteen R18, the positive electrode of voltage stabilizing diode D10 is electrically connected to the negative electrode of voltage stabilizing diode eleven D11, the positive electrode of voltage stabilizing diode eleven D11 is electrically connected to the positive electrode of energy storage capacitor Eight EC8 The other end is electrically connected, the other end of the resistor R18 is electrically connected to the other end of the discharge resistor R15, the source of the MOS tube V5 is electrically connected to the other end of the capacitor C10, the No. 9 interface of the isolation transformer T3 is electrically connected to the GY-2 port, the GY-2 port is electrically connected to the high-voltage voltage doubling circuit, the connection circuit between the No. 9 interface of the isolation transformer T3 and the GY-2 port is electrically connected to the positive electrode of the voltage-stabilizing diode D8, one end of the resistor R10, the drain of the MOS tube V5 and the source of the MOS tube V4, the No. 10 interface of the isolation transformer T3 is electrically connected to one end of the current limiting damping resistor R54, the other end of the current limiting damping resistor R54 is electrically connected to the gate of the MOS tube V4,The connection circuit between the No. 10 interface of the isolation transformer three T3 and the current limiting damping resistor fifty-four R54 is electrically connected to the negative electrode of the diode six D6, the connection circuit between the current limiting damping resistor fifty-four R54 and the gate of the MOS tube four V4 is electrically connected to the positive electrode of the diode six D6, the positive electrode of the voltage stabilizing diode seven D7 and the other end of the resistor ten R10, the negative electrode of the voltage stabilizing diode seven D7 is electrically connected to the negative electrode of the voltage stabilizing diode eight D8, the drain of the MOS tube four V4 is electrically connected to the +310V output interface, the model of the driver chip two U2 is set to UCC27324, the model of the diode six D6 and the diode nine D9 is set to RS1M, and the model of the MOS tube four V4 and the MOS tube five V5 is set to G31N50C.

[0053] When the present invention is used, MOS tube four V4 and MOS tube five V5 are power transmission control bridge arms, and cooperate with their connection ends and the high-voltage voltage doubling circuit to form a half-bridge resonant circuit for power transmission, thereby reducing switching losses in the circuit and improving power density.

[0054] The single-chip processing circuit includes a single-chip microcomputer U3, a program burning port CN5, a capacitor C6 and a thermistor RT1;

[0055] Pin No. 19 of the single-chip microcomputer U3 is electrically connected to the P1_0 port, Pin No. 18 of the single-chip microcomputer U3 is electrically connected to the P3_7 port, Pin No. 8 of the single-chip microcomputer U3 is electrically connected to the +5V output interface, the connection circuit between Pin No. 8 of the single-chip microcomputer U3 and the +5V output interface is electrically connected to one end of capacitor C27, one end of capacitor C13 and one end of varistor RV2, the other end of capacitor C27, the other end of capacitor C13 and the other end of varistor RV2 are grounded, Pin No. 10 of the single-chip microcomputer U3 is grounded, Pin No. 11 of the single-chip microcomputer U3 is electrically connected to one end of resistor R24, the other end of resistor R24 ​​is electrically connected to the RXD port, the RXD port is electrically connected to port No. 3 of the program burning port CN5, Pin No. 12 of the single-chip microcomputer U3 is electrically connected to one end of resistor R21, the other end of resistor R21 is electrically connected to the TXD port The TXD port is electrically connected to the No. 4 port of the program burning port CN5, the No. 20 pin of the single-chip computer U3 is electrically connected to one end of the resistor R11, the other end of the resistor R11 is electrically connected to one end of the thermistor RT1, the other end of the thermistor RT1 is grounded, the connection circuit between the resistor R11 and the thermistor RT1 is electrically connected to one end of the resistor R9 and one end of the capacitor C6, the other end of the resistor R9 is electrically connected to the +5V output interface, the other end of the capacitor C6 is grounded, the No. 1 port of the program burning port CN5 is electrically connected to the +5V output interface, the No. 2 port of the program burning port CN5 is grounded, the single-chip computer U3 is connected to the high-voltage sampling circuit, the communication and output interface circuit, the output indication circuit and the digital tube display circuit, the model of the single-chip computer U3 is set to STC15W408AS-TSSOP20, and the model of the thermistor RT1 is set to 10K3950.

[0056] When the present invention is used, the single chip microcomputer U3 collects high voltage information through the internal ADC module, and processes key information, digital tube content display, and the generation of upper and lower bridge arm drive signals of MOS tube V4 and MOS tube V5.

[0057] The high voltage doubler circuit includes a voltage doubler transformer T4, an interface terminal four CN4, a high voltage rectifier bridge three BR3, a ceramic resistor R50 and a three-terminal voltage regulator chip three V3;

[0058] Interface No. 1 of the voltage doubler transformer T4 is electrically connected to the CN4-6 port of the interface terminal CN4, the CN4-6 port is electrically connected to the GY-1 port, interface No. 2 of the voltage doubler transformer T4 is electrically connected to the CN4-5 port of the interface terminal CN4, the CN4-5 port is electrically connected to the GY-2 port, interface No. 3 of the voltage doubler transformer T4 is electrically connected to the CN4-1 port of the interface terminal CN4, the CN4-1 port of the interface terminal CN4 is electrically connected to the negative pole of the diode D3, interface No. 4 of the voltage doubler transformer T4 is electrically connected to the CN4-2 port of the interface terminal CN4, the CN4-2 port is electrically connected to the negative pole of the diode D2, interface No. 5 of the voltage doubler transformer T4 is electrically connected to the CN4-2 port of the interface terminal CN4, the CN4-2 port is electrically connected to the negative pole of the diode D2, interface No. 6 of the voltage doubler transformer T4 is electrically connected to the CN4-3 port of the high-voltage rectifier bridge BR3, and the CN4-4 port is electrically connected to the CN4-5 port of the interface terminal CN4. The port is electrically connected, the No. 6 interface and the No. 7 interface of the voltage doubling transformer T4 are electrically connected to the negative electrode of the diode thirteen D13, the positive electrode of the diode thirteen D13 is electrically connected to the LV port, the No. 8 interface of the voltage doubling transformer T4 is electrically connected to the No. 3 interface of the high-voltage rectifier bridge three BR3, the No. 1 interface of the high-voltage rectifier bridge three BR3 is electrically connected to the HV port, the connection circuit between the No. 1 interface of the high-voltage rectifier bridge three BR3 and the HV port is electrically connected to one end of the ceramic resistor R50, the other end of the ceramic resistor R50 is electrically connected to the CN4-3 port of the interface terminal four CN4, the No. 4 interface of the high-voltage rectifier bridge three BR3 is electrically connected to the CN4-4 port of the interface terminal four CN4, the CN4-3 port of the interface terminal four CN4 is connected to the BY-3 port, and the BY- -3 port is connected to the high-voltage sampling circuit, the CN4-4 port of the interface terminal four CN4 is connected to the BY-2 port, the anode of the diode two D2 and the anode of the diode three D3 are electrically connected to the No. 2 port of the interface terminal three CN3, the connection circuit between the anode of the diode three D3 and the No. 2 port of the interface terminal three CN3 is electrically connected to one end of the energy storage capacitor four EC4, the No. 2 port of the three-terminal voltage regulator chip three V3 and one end of the energy storage capacitor five EC5, the connection circuit between the CN4-1 port of the interface terminal four CN4 and the diode three D3 is electrically connected to the anode of the diode four D4, the connection circuit between the CN4-2 port of the interface terminal four CN4 and the diode two D2 is electrically connected to the anode of the diode five D5, and the cathode of the diode four D4 The cathode of diode five D5 is electrically connected to interface No. 1 of three-terminal voltage regulator chip three V3, the connection circuit between the cathode of diode five D5 and interface No. 1 of three-terminal voltage regulator chip three V3 is electrically connected to the other end of energy storage capacitor four EC4, interface No. 3 of three-terminal voltage regulator chip three V3 is electrically connected to port No. 1 of interface terminal two CN2, the connection circuit between interface No. 3 of three-terminal voltage regulator chip three V3 and port No. 1 of interface terminal two CN2 is electrically connected to the other end of energy storage capacitor five EC5 and port No. 1 of interface terminal three CN3, port No. 2 of interface terminal two CN2 is electrically connected to port No. 2 of interface terminal three CN3, and ports No. 1 and No. 2 of interface terminal two CN2 and interface terminal three CN3 are electrically connected to the +12V output interface respectively.The model of interface terminal four CN4 is set to DB128-5.08-6P, the resistance value of ceramic resistor R50 is set to 165MΩ, the model of high-voltage rectifier bridge three BR3 is set to 2CL85X8, the model of interface terminal two CN2 is set to XH2-2.5, the model of three-terminal voltage regulator chip three V3 is set to L7812CV, and the models of diode two D2, diode three D3, diode four D4 and diode five D5 are set to RS1M.

[0059] When the present invention is used, the voltage of the half-bridge resonant circuit is increased to a higher voltage in this part, and the ceramic resistor R50 divides the high voltage to complete the conversion from low voltage to high voltage.

[0060] When the present invention is used, the high-voltage power supply outputs high-voltage HV connected to the charging area of ​​the electric field to form a charged electric field, ionize the oil fume gas to charge the particles, and the high-voltage power supply outputs a secondary high-voltage LV connected to the dust collection area of ​​the electric field to form a dust collection electric field to adsorb charged particles. In actual application, the HV output power accounts for more than 80% of the overall output power. Adjusting the HV voltage can adjust the power supply output power and the electric field ionization ability, thereby playing a role in adjusting the electric field purification efficiency.

[0061] The high voltage sampling circuit includes an inductor L1, a capacitor C19, a variable resistor VR1, a varistor RV3, an operational amplifier U4-A and a resistor R25;

[0062] One end of the inductor L1 is electrically connected to the BY-3 port, the other end of the inductor L1 is electrically connected to one end of the resistor R30, the connection circuit between the inductor L1 and the resistor R30 is electrically connected to one end of the capacitor C19 and one end of the fixed end of the variable resistor VR1, the other end of the capacitor C19 and the other end of the fixed end of the variable resistor VR1 are grounded, the other end of the resistor R30 is electrically connected to one end of the resistor R29, the connection circuit between the resistor R30 and the resistor R29 is connected to the sliding end of the variable resistor VR1 and the One end of capacitor C18 is electrically connected, the other end of capacitor C18 is grounded, the other end of resistor R29 is electrically connected to one end of varistor RV3, the other end of varistor RV3 is grounded, the connection circuit between resistor R29 and varistor RV3 is electrically connected to port No. 2 of operational amplifier U4-A, port No. 2 of operational amplifier U4-A is electrically connected to one end of resistor R28, the connection circuit between port No. 2 of operational amplifier U4-A and resistor R28 is electrically connected to one end of capacitor C20, The other end of capacitor C20 is electrically connected to interface No. 1 of operational amplifier U4-A, the connection circuit between capacitor R20 and interface No. 1 of operational amplifier U4-A is electrically connected to the other end of resistor R28 and one end of resistor R27, the other end of resistor R27 is electrically connected to port P1_7, the P1_7 port is electrically connected to pin No. 6 of microcontroller U3, the connection circuit between resistor R28 and resistor R27 is electrically connected to one end of capacitor C17, the other end of capacitor C17 is grounded, and the operational amplifier U4-A is connected to the other end of resistor R28 and one end of resistor R27. Interface No. 3 of amplifier four U4-A is electrically connected to one end of resistor twenty-five R25, the other end of resistor twenty-five R25 is grounded, interface No. 4 of operational amplifier four U4-A is grounded, interface No. 8 of operational amplifier four U4-A is electrically connected to one end of capacitor fifteen C15, the other end of capacitor fifteen C15 is grounded, the connection circuit between interface No. 8 of operational amplifier four U4-A and capacitor fifteen C15 is electrically connected to the +5V output interface, the maximum resistance value of variable resistor one VR1 is set to 10kΩ, and the model of operational amplifier four U4-A is set to LM258.

[0063] When the present invention is used, the inductor L1 and the capacitor C19 are used as the LC filter circuit for filtering, the variable resistor VR1 can calibrate the sampled high voltage value by adjusting its resistance value, the operational amplifier U4-A, the resistor R25, the resistor R28, the capacitor C17 and the capacitor C20 form an active filtering circuit to make the collected high voltage signal cleaner and have a strong anti-interference ability. At the same time, this part converts the high voltage voltage of 10-20kV into a 0-5V signal that can be detected by the single-chip microcomputer U3.

[0064] The communication and output interface circuit includes a resistor R2, a driver chip U7, a transistor Q1, a voltage stabilizing diode TVS3, a voltage stabilizing diode TVS4 and an interface terminal CN1;

[0065] One end of the resistor R2 is electrically connected to the TXD port, the other end of the resistor R2 is electrically connected to the base of the transistor Q1, the emitter of the transistor Q1 is electrically connected to the +5V output interface, the collector of the transistor Q1 is electrically connected to pin 2 of the driver chip U7, the connection circuit between the collector of the transistor Q1 and pin 2 of the driver chip U7 is electrically connected to one end of the resistor R43, pin 1 of the driver chip U7 is electrically connected to the RXD port, the connection circuit between pin 2 of the driver chip U7 and the resistor R43 is electrically connected to pin 3 of the driver chip U7, and pin 4 of the driver chip U7 is electrically connected to the RXD port. Pin No. 1 is electrically connected to the TXD port, the other end of resistor R43 is grounded, pin No. 5 of driver chip U7 is grounded, pin No. 6 of driver chip U7 is electrically connected to port 485A, the connection circuit between pin No. 6 of driver chip U7 and port 485A is electrically connected to the negative electrode of voltage stabilizing diode TVS4, pin No. 7 of driver chip U7 is electrically connected to port 485B, the connection circuit between pin No. 7 of driver chip U7 and port 485B is electrically connected to one end of resistor R46 and the negative electrode of voltage stabilizing diode TVS3, the other end of resistor R46 and the positive electrode of voltage stabilizing diode TVS4 are electrically connected. The positive pole of the Zener diode TVS3 is grounded, the connection circuit between the 485A port and the Zener diode TVS4 is electrically connected to one end of the resistor R45 and one end of the resistor R44, the connection circuit between the 485B port and the Zener diode TVS3 is electrically connected to the other end of the resistor R45, the No. 8 pin of the driver chip U7 is electrically connected to the other end of the resistor R44, the connection circuit between the No. 8 pin of the driver chip U7 and the resistor R44 is electrically connected to the +5V output interface and one end of the capacitor C16, the other end of the capacitor C16 is grounded, and the No. 1 pin of the interface terminal CN1 is electrically connected to the other end of the resistor R44. The port is electrically connected to the 485B port, port 2 of the interface terminal CN1 is electrically connected to the 485A port, port 7 of the interface terminal CN1 is electrically connected to the WASH port, port 8 of the interface terminal CN1 is electrically connected to the ERR port, port 9 of the interface terminal CN1 is electrically connected to the WORK port, port 10 of the interface terminal CN1 is electrically connected to the +15V output interface, the model of the driver chip U7 is set to MX487EISA, the model of the transistor Q1 is set to S8550Y2, and the model of the Zener diode TVS3 and the Zener diode TVS4 are set to SMBJ6.5CA.

[0066] The output indication circuit includes a driving chip U1, an indicator light LED2 and a resistor R1;

[0067] Pin 1 of the driver chip U1 is electrically connected to the P5_5_R port, which is electrically connected to pin 9 of the single-chip microcomputer U3. Pin 2 of the driver chip U1 is electrically connected to the P1_6 port, which is electrically connected to pin 5 of the single-chip microcomputer U3. Pin 3 of the driver chip U1 is electrically connected to the P1_4 port, which is electrically connected to pin 3 of the single-chip microcomputer U3. Pin 4 of the driver chip U1 is electrically connected to the P1_3_G port, which is electrically connected to pin 2 of the single-chip microcomputer U3. Pin 4 of the driver chip U1 is electrically connected to the P1_3_G port, which is electrically connected to pin 2 of the single-chip microcomputer U3. The connection circuit between the 3_G port is electrically connected to the No. 6 pin of the driver chip U1, the No. 5 pin of the driver chip U1 is electrically connected to the P1_2_Y port, the P1_2_Y port is electrically connected to the No. 1 pin of the single-chip computer U3, the connection circuit between the No. 5 pin of the driver chip U1 and the P1_2_Y port is electrically connected to the No. 7 pin of the driver chip U1, the No. 8 pin of the driver chip U1 is grounded, the No. 9 pin of the driver chip U1 is electrically connected to the +15V output interface, the No. 10 pin of the driver chip U1 is electrically connected to one end of the resistor R5, and the other end of the resistor R5 is electrically connected to the WASH port The pin 11 of the driver chip U1 is electrically connected to one end of the resistor R6, and the other end of the resistor R6 is electrically connected to the WORK port. The pin 12 of the driver chip U1 is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to the positive electrode of the indicator light LED3, and the negative electrode of the indicator light LED3 is electrically connected to the +15V output interface. The pin 13 of the driver chip U1 is electrically connected to one end of the resistor R4, and the other end of the resistor R4 is electrically connected to the positive electrode of the indicator light LED2, and the negative electrode of the indicator light LED2 is electrically connected to the +15V output interface. Pin 16 is electrically connected to one end of resistor R1, the other end of resistor R1 is connected to ERR port, P5_5_R port is electrically connected to one end of resistor R23, the other end of resistor R23 is electrically connected to the positive pole of indicator light LED4, the negative pole of indicator light LED4 is grounded, P5_4 port is electrically connected to one end of resistor R20, P5_4 port is electrically connected to pin 7 of microcontroller U3, the other end of resistor R20 is electrically connected to the positive pole of indicator light LED5, the negative pole of indicator light LED5 is grounded, and the model of driver chip U1 is set to ULN2003.

[0068] When the present invention is used, the red, green and yellow lights indicate the operating status of the power supply, the working status is green, the cleaning status is yellow, and the fault status is red, so that real-time monitoring is achieved.

[0069] The relay state circuit includes two groups of relays, the output ports of the two groups of relays are respectively electrically connected to the ports of the single chip computer U3, and the connectors of the two groups of relays are respectively electrically connected to the power input terminals of the external devices.

[0070] When the present invention is used, the two groups of relays can automatically connect and disconnect the circuit according to the change of the input voltage, realize the automatic control of circuit cleaning and faults, and externally represent the state of system operation and fault information.

[0071] Embodiment 2: In some embodiments, Fig.11 As shown, as a preferred embodiment of the present invention, the digital tube display circuit includes a driving chip U5, a digital tube LED6, an energy storage capacitor EC7 and a capacitor C22;

[0072] Interface No. 1 of the driver chip U5 is electrically connected to the DIG1 port, interface No. 2 of the driver chip U5 is electrically connected to one end of resistor R38, the other end of resistor R38 is electrically connected to the P3_4 port, the P3_4 port is electrically connected to pin No. 15 of the single-chip computer U3, interface No. 3 of the driver chip U5 is electrically connected to one end of resistor R36, the other end of resistor R36 is electrically connected to the P3_5 port, the P3_5 port is electrically connected to pin No. 16 of the single-chip computer U3, interface No. 4 of the driver chip U5 is grounded, interface No. 5 of the driver chip U5 is electrically connected to the DIG2 port, interface No. 6 of the driver chip U5 is electrically connected to the DIG1 port, and interface No. 7 of the driver chip U5 is electrically connected to the DIG2 port. Interface No. 1 is electrically connected to the DIG3 port, interface No. 7 of the driver chip U5 is electrically connected to the DIG4 port, interface No. 8 of the driver chip U5 is electrically connected to the DIG2 port, interface No. 9 of the driver chip U5 is electrically connected to the B port, interface No. 10 of the driver chip U5 is electrically connected to the +5V output interface, a connection circuit between interface No. 10 of the driver chip U5 and the +5V output interface is electrically connected to one end of the energy storage capacitor EC7, a connection circuit between interface No. 10 of the driver chip U5 and the energy storage capacitor EC7 is electrically connected to one end of capacitor C22, and the other end of the energy storage capacitor EC7 is connected to the other end of capacitor C22. The No. 11 interface of the driving chip U5 is electrically connected to the C port, the No. 12 interface of the driving chip U5 is electrically connected to the D port, the No. 13 interface of the driving chip U5 is electrically connected to the E port, the No. 14 interface of the driving chip U5 is electrically connected to the F port, the No. 15 interface of the driving chip U5 is electrically connected to the G port, the No. 16 interface of the driving chip U5 is electrically connected to the DP port, the No. 1 interface of the digital tube LED6 is electrically connected to the E port, the No. 2 interface of the digital tube LED6 is electrically connected to the D port, the No. 3 interface of the digital tube LED6 is electrically connected to the DP port, the No. 4 interface of the digital tube LED6 is electrically connected to the C port, and the No. 6 LE Interface No. 5 of D6 is electrically connected to port G, interface No. 6 of digital tube LED6 is electrically connected to port DIG4, interface No. 7 of digital tube LED6 is electrically connected to port B, interface No. 8 of digital tube LED6 is electrically connected to port DIG3, interface No. 9 of digital tube LED6 is electrically connected to port DIG2, interface No. 10 of digital tube LED6 is electrically connected to port F, interface No. 11 of digital tube LED6 is electrically connected to port A, interface No. 12 of digital tube LED6 is electrically connected to port DIG1, ​​the model of driver chip five U5 is set to TM1650, and the model of digital tube six LED6 is set to CS3641AH.

[0073] When the present invention is used, the high-voltage output voltage can be displayed in real time through a four-digit digital tube display, and a fault code can be displayed when a circuit fault occurs.

[0074] Embodiment 3: In some embodiments, Fig.12As shown, as a preferred embodiment of the present invention, the key input circuit includes a switch SW1, a key KEY1, a resistor 40 R40, and a resistor 41 R41;

[0075] Interface No. 3 at one end of the switch SW1 is electrically connected to port P3_3, port P3_3 is electrically connected to pin No. 14 of single-chip computer U3, interface No. 4 at one end of the switch SW1 is electrically connected to one end of resistor R41, the other end of resistor R41 is electrically connected to port P3_4, port P3_4 is electrically connected to pin No. 15 of single-chip computer U3, the other end of the switch SW1 is grounded, one end of resistor R40 is electrically connected to port DIG4, the other end of resistor R40 is electrically connected to one end of key 1 KEY1, key 2 KEY2, key 3 KEY3 and key 4 KEY4, and the other ends of key 1 KEY1, key 2 KEY2, key 3 KEY3 and key 4 KEY4 are electrically connected to port E, port D, port G and port A respectively.

[0076] When the present invention is used, button KEY1 is an increase button, and each time it is pressed, the output voltage increases by 100V. Button KEY2 is a switch button, and the display of current and voltage is switched after being pressed. Button KEY3 is a decrease button, and the output voltage decreases by 100V each time it is pressed. Button KEY4 is a reset button, and long pressing for 3S resets the built-in parameters of the single-chip microcomputer.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage constant-voltage digital power supply for oil fume purification, including a rectifier and filter circuit, characterized in that: It also includes an auxiliary power supply circuit for providing weak electricity, a MOS tube isolation drive circuit for controlling power conversion, a single-chip processing circuit for generating signals and control algorithms, a high-voltage voltage doubling circuit for boosting, a high-voltage sampling circuit for converting and detecting voltage, a communication and output interface circuit for communication signal transmission, an output indication circuit for representing the power supply status, a relay status circuit for representing the system operation status, a digital tube display circuit for real-time display of voltage, and a key input circuit for adjusting voltage; The rectifier and filter circuit is connected to the auxiliary power supply circuit, the MOS tube isolation drive circuit and the high-voltage voltage doubler circuit, the MOS tube isolation drive circuit is connected to the high-voltage voltage doubler circuit, the high-voltage voltage doubler circuit is connected to the high-voltage sampling circuit, the communication and output interface circuit is connected to the output indication circuit, and the single-chip microcomputer processing circuit is connected to the auxiliary power supply circuit, the high-voltage sampling circuit, the communication and output interface circuit, the relay state circuit, the digital tube display circuit and the key input circuit.

2. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 1 is characterized in that: The rectifier filter circuit and the auxiliary power supply circuit include an interface terminal six (CN6), a common mode inductor (Z1), an X capacitor one (C1), an X capacitor two (C2), a rectifier bridge one (BR1), an energy storage capacitor eight (EC8), an industrial frequency step-down transformer one (T1), a rectifier bridge two (DB1), a filter capacitor one (EC1), a three-terminal voltage regulator chip one (V1) and a three-terminal voltage regulator chip two (V2); The interface terminal six (CN6) is electrically connected to the external power supply 220VAC interface as a power input terminal, interface No. 1 of the interface terminal six (CN6) is grounded, interface No. 2 of the interface terminal six (CN6) is electrically connected to one end of the varistor six (RV6), interface No. 3 of the interface terminal six (CN6) is electrically connected to one end of the fuse one (F1), the other end of the varistor six (RV6) is electrically connected to the other end of the fuse one (F1), the varistor six (RV6) is connected in parallel with the X capacitor one (C1), one end of the X capacitor one (C1) is electrically connected to the interface No. 1 of the common mode inductor (Z1), the other end of the X capacitor one (C1) is electrically connected to the interface No. 4 of the common mode inductor one (Z1), and the 2 of the common mode inductor one (Z1) is electrically connected to the interface No. 5 of the common mode inductor one (Z1). Interface No. 1 is electrically connected to interface No. 3 of rectifier bridge 1 (BR1), interface No. 3 of common-mode inductor 1 (Z1) is electrically connected to interface No. 2 of rectifier bridge 1 (BR1), a connection circuit between interface No. 2 of common-mode inductor 1 (Z1) and interface No. 3 of rectifier bridge 1 (BR1) is electrically connected to one end of X capacitor 2 (C2), a connection circuit between interface No. 3 of common-mode inductor 1 (Z1) and interface No. 2 of rectifier bridge 1 (BR1) is electrically connected to the other end of X capacitor 2 (C2), interface No. 4 of rectifier bridge 1 (BR1) is connected to the MOS tube isolation drive circuit, interface No. 1 of rectifier bridge 1 (BR1) is electrically connected to one end of the +310V output interface, and the other end of the +310V output interface is connected to the MOS tube isolation drive circuit. The connection circuit between the No. 1 interface of the rectifier bridge 1 (BR1) and the +310V output interface is electrically connected to one end of the energy storage capacitor 8 (EC8), one end of the discharge resistor 7 (R7) and one end of the capacitor 5 (C5), the other end of the energy storage capacitor 8 (EC8) is connected to the MOS tube isolation drive circuit, the other end of the discharge resistor 7 (R7) is electrically connected to one end of the discharge resistor 15 (R15), the other end of the discharge resistor 15 (R15) is connected to the MOS tube isolation drive circuit, the other end of the capacitor 5 (C5) is electrically connected to one end of the capacitor 10 (C10), the other end of the capacitor 10 (C10) is connected to the MOS tube isolation drive circuit, and the connection between the discharge resistor 7 (R7) and the discharge resistor 15 (R15) is electrically connected to one end of the capacitor 10 (C10). The connecting circuit is electrically connected to the connecting circuit between capacitor five (C5) and capacitor ten (C10), the connecting circuit between capacitor five (C5) and capacitor ten (C10) is electrically connected to one end of capacitor eight (C8), the other end of capacitor eight (C8) is electrically connected to GY-1 port, GY-1 port is electrically connected to the high voltage voltage doubling circuit, the connecting circuit between varistor six (RV6) and X capacitor one (C1) is electrically connected to interface No. 1 of power frequency step-down transformer one (T1), the connecting circuit between X capacitor one (C1) and port No. 1 of common mode inductor one (Z1) is electrically connected to interface No. 4 of power frequency step-down transformer one (T1), interface No. 8 of power frequency step-down transformer one (T1) is electrically connected to interface No. 1 of rectifier bridge two (DB1),Interface No. 6 of the power frequency step-down transformer 1 (T1) is electrically connected to interface No. 2 of the rectifier bridge 2 (DB1), interface No. 3 of the rectifier bridge 2 (DB1) is electrically connected to interface No. 1 of the three-terminal voltage regulator chip 1 (V1), port No. 4 of the rectifier bridge 2 (DB1) is grounded, the connection circuit between interface No. 3 of the rectifier bridge 2 (DB1) and interface No. 1 of the three-terminal voltage regulator chip 1 (V1) is electrically connected to one end of the energy storage capacitor 1 (EC1), the other end of the energy storage capacitor 1 (EC1) is grounded, interface No. 2 of the three-terminal voltage regulator chip 1 (V1) is grounded, interface No. 3 of the three-terminal voltage regulator chip 1 (V1) is electrically connected to interface No. 3 of the three-terminal voltage regulator chip 2 (V2), the connection circuit between interface No. 3 of the three-terminal voltage regulator chip 1 (V1) and interface No. 3 of the three-terminal voltage regulator chip 2 (V2) is electrically connected to one end of capacitor 3 (C3) and one end of energy storage capacitor 3 (EC3), capacitor 3 (C3) The other end of the energy storage capacitor 3 (EC3) is grounded, the connection circuit between capacitor 3 (C3) and energy storage capacitor 3 (EC3) is electrically connected to one end of the +15V output interface, the other end of the +15V output interface is connected to the MOS tube isolation drive circuit, the communication and output interface circuit and the output indication circuit, the No. 2 interface of the three-terminal voltage regulator chip 2 (V2) is grounded, the No. 1 interface of the three-terminal voltage regulator chip 2 (V2) is electrically connected to one end of the energy storage capacitor 2 (EC2), the other end of the energy storage capacitor 2 (EC2) is grounded, the connection circuit between the No. 1 interface of the three-terminal voltage regulator chip 2 (V2) and energy storage capacitor 2 (EC2) is electrically connected to one end of the +5V output interface and one end of capacitor 4 (C4), the other end of the +5V output interface is connected to the single-chip processing circuit, the high-voltage sampling circuit, the communication and output interface circuit, and the digital tube display circuit, and the other end of capacitor 4 (C4) is grounded. , 3. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 2 is characterized in that: The MOS tube isolation driving circuit comprises a driving chip 2 (U2), an isolation transformer 3 (T3), a DC blocking capacitor 7 (C7), a current limiting damping resistor 54 (R54), a current limiting damping resistor 57 (R57), a MOS tube 4 (V4) and a MOS tube 5 (V5); Interface No. 1 and interface No. 3 of the driving chip 2 (U2) are grounded, interface No. 2 of the driving chip 2 (U2) is electrically connected to one end of the resistor (R13), the other end of the resistor 13 (R13) is electrically connected to the P1_0 port, interface No. 4 of the driving chip 2 (U2) is electrically connected to one end of the resistor 14 (R14), the other end of the resistor 14 (R14) is electrically connected to the P3_7 port, the P1_0 port and the P3_7 port are connected to the single-chip microcomputer processing circuit, interface No. 5 of the driving chip 2 (U2) is electrically connected to interface No. 5 of the isolation transformer 3 (T3), interface No. 6 of the driving chip 2 (U2) is electrically connected to one end of the capacitor 11 (C11), and interface No. 6 of the driving chip 2 (U2) is electrically connected to one end of the capacitor 11 (C11). The connection circuit between the No. 7 interface and the capacitor eleven (C11) is electrically connected to one end of the energy storage capacitor six (EC6) and the +15V output interface, the other end of the capacitor eleven (C11) and the other end of the energy storage capacitor six (EC6) are grounded, the No. 7 interface of the driver chip two (U2) is electrically connected to one end of the DC isolation capacitor seven (C7), the other end of the DC isolation capacitor seven (C7) is electrically connected to the No. 2 interface of the isolation transformer three (T3), the No. 8 interface of the driver chip two (U2) is grounded, the connection circuit between the DC isolation capacitor seven (C7) and the No. 2 interface of the isolation transformer three (T3) is electrically connected to one end of the resistor twelve (R12), the other end of the resistor twelve (R12) is electrically connected to one end of the capacitor nine (C9). The connection circuit between the interface No. 5 of the driver chip 2 (U2) and the interface No. 5 of the isolation transformer 3 (T3) is electrically connected to the other end of the capacitor 9 (C9), the interface No. 6 of the isolation transformer 3 (T3) is electrically connected to the interface No. 4 of the rectifier bridge 1 (BR1), the interface No. 7 of the isolation transformer 3 (T3) is electrically connected to one end of the current limiting damping resistor 57 (R57), the other end of the current limiting damping resistor 57 (R57) is electrically connected to the gate of the MOS tube 5 (V5), the connection circuit between the interface No. 7 of the isolation transformer 3 (T3) and the current limiting damping resistor 57 (R57) is electrically connected to the negative electrode of the diode 9 (D9), the current limiting damping resistor 57 (R57) is electrically connected to the MOS tube 5 (V5), and the current limiting damping resistor 57 (R57) is electrically connected to the negative electrode of the diode 9 (D9). The connection circuit between the gate of the tube five (V5) is electrically connected to the positive electrode of the diode nine (D9), the positive electrode of the voltage-stabilizing diode ten (D10) and one end of the resistor eighteen (R18), the positive electrode of the voltage-stabilizing diode ten (D10) is electrically connected to the negative electrode of the voltage-stabilizing diode eleven (D11), the positive electrode of the voltage-stabilizing diode eleven (D11) is electrically connected to the other end of the energy storage capacitor eight (EC8), the other end of the resistor eighteen (R18) is electrically connected to the other end of the discharge resistor fifteen (R15), the source of the MOS tube five (V5) is electrically connected to the other end of the capacitor ten (C10), the No. 9 interface of the isolation transformer three (T3) is electrically connected to the GY-2 port, and the GY-2 port is electrically connected to the high-voltage voltage doubling circuit,The connection circuit between the No. 9 interface of the isolation transformer three (T3) and the GY-2 port is electrically connected to the positive electrode of the voltage-stabilizing diode eight (D8), one end of the resistor ten (R10), the drain of the MOS tube five (V5) and the source of the MOS tube four (V4), the No. 10 interface of the isolation transformer three (T3) is electrically connected to one end of the current-limiting damping resistor fifty-four (R54), the other end of the current-limiting damping resistor fifty-four (R54) is electrically connected to the gate of the MOS tube four (V4), and the No. 10 interface of the isolation transformer three (T3) is electrically connected to one end of the current-limiting damping resistor fifty-four (R54). The connection circuit between the port and the current limiting damping resistor fifty-four (R54) is electrically connected to the cathode of the diode six (D6), the connection circuit between the current limiting damping resistor fifty-four (R54) and the gate of the MOS tube four (V4) is electrically connected to the anode of the diode six (D6), the anode of the voltage stabilizing diode seven (D7) and the other end of the resistor ten (R10), the cathode of the voltage stabilizing diode seven (D7) is electrically connected to the cathode of the voltage stabilizing diode eight (D8), and the drain of the MOS tube four (V4) is electrically connected to the +310V output interface.

4. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 3 is characterized in that: The single-chip processing circuit includes single-chip three (U3), a program burning port (CN5), a capacitor six (C6) and a thermistor one (RT1); Pin No. 19 of the single-chip computer 3 (U3) is electrically connected to the P1_0 port, Pin No. 18 of the single-chip computer 3 (U3) is electrically connected to the P3_7 port, Pin No. 8 of the single-chip computer 3 (U3) is electrically connected to the +5V output interface, and the connection circuit between Pin No. 8 of the single-chip computer 3 (U3) and the +5V output interface is electrically connected to one end of capacitor 27 (C27), one end of capacitor 13 (C13) and one end of varistor 2 (RV2), capacitor 27 (C2 7), the other end of capacitor 13 (C13) and the other end of varistor 2 (RV2) are grounded, pin 10 of single-chip computer 3 (U3) is grounded, pin 11 of single-chip computer 3 (U3) is electrically connected to one end of resistor 24 (R24), the other end of resistor 24 (R24) is electrically connected to RXD port, RXD port is electrically connected to port 3 of program burning port (CN5), pin 12 of single-chip computer 3 (U3) is electrically connected to resistor 21 (R 21), the other end of resistor twenty-one (R21) is electrically connected to the TXD port, the TXD port is electrically connected to port No. 4 of the program burning port (CN5), pin No. 20 of the single-chip computer three (U3) is electrically connected to one end of resistor eleven (R11), the other end of resistor eleven (R11) is electrically connected to one end of thermistor one (RT1), the other end of thermistor one (RT1) is grounded, the connection circuit between resistor eleven (R11) and thermistor one (RT1) is electrically connected to one end of resistor nine (R9) and one end of capacitor six (C6), the other end of resistor nine (R9) is electrically connected to the +5V output interface, the other end of capacitor six (C6) is grounded, port No. 1 of the program burning port (CN5) is electrically connected to the +5V output interface, port No. 2 of the program burning port (CN5) is grounded, and the single-chip computer three (U3) is connected to the high-voltage sampling circuit, the communication and output interface circuit, the output indication circuit and the digital tube display circuit.

5. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 4 is characterized in that: The high-voltage voltage doubling circuit comprises a voltage doubling transformer (T4), an interface terminal four (CN4), a high-voltage rectifier bridge three (BR3), a ceramic resistor (R50) and a three-terminal voltage stabilizing chip three (V3); Interface No. 1 of the voltage doubler transformer (T4) is electrically connected to the CN4-6 port of the interface terminal four (CN4), the CN4-6 port is electrically connected to the GY-1 port, interface No. 2 of the voltage doubler transformer (T4) is electrically connected to the CN4-5 port of the interface terminal four (CN4), the CN4-5 port is electrically connected to the GY-2 port, interface No. 3 of the voltage doubler transformer (T4) is electrically connected to the CN4-1 port of the interface terminal four (CN4), the CN4-1 port of the interface terminal four (CN4) is electrically connected to the negative pole of the diode three (D3), interface No. 4 of the voltage doubler transformer (T4) is electrically connected to the CN4-2 port of the interface terminal four (CN4), the CN4-2 port is electrically connected to the positive pole of the diode two (D2), and the CN4-3 port is electrically connected to the negative pole of the diode three (D3). The negative pole is electrically connected, the No. 5 interface of the voltage doubler transformer (T4) is electrically connected to the No. 2 interface of the high-voltage rectifier bridge three (BR3), the No. 6 interface and the No. 7 interface of the voltage doubler transformer (T4) are electrically connected to the negative pole of the diode thirteen (D13), the positive pole of the diode thirteen (D13) is electrically connected to the LV port, the No. 8 interface of the voltage doubler transformer (T4) is electrically connected to the No. 3 interface of the high-voltage rectifier bridge three (BR3), the No. 1 interface of the high-voltage rectifier bridge three (BR3) is electrically connected to the HV port, the connection circuit between the No. 1 interface of the high-voltage rectifier bridge three (BR3) and the HV port is electrically connected to one end of the ceramic resistor (R50), and the other end of the ceramic resistor (R50) is connected to the CN4-3 port of the interface terminal four (CN4). Electrical connection, interface No. 4 of high-voltage rectifier bridge three (BR3) is electrically connected to CN4-4 port of interface terminal four (CN4), CN4-3 port of interface terminal four (CN4) is connected to BY-3 port, BY-3 port is connected to high-voltage sampling circuit, CN4-4 port of interface terminal four (CN4) is connected to BY-2 port, positive electrode of diode two (D2) and positive electrode of diode three (D3) are electrically connected to port No. 2 of interface terminal three (CN3), the connection circuit between positive electrode of diode three (D3) and port No. 2 of interface terminal three (CN3) is connected to one end of energy storage capacitor four (EC4), interface No. 2 of three-terminal voltage regulator chip three (V3) and one end of energy storage capacitor five (EC5) The connection circuit between the CN4-1 port of the interface terminal four (CN4) and the diode three (D3) is electrically connected to the positive electrode of the diode four (D4), the connection circuit between the CN4-2 port of the interface terminal four (CN4) and the diode two (D2) is electrically connected to the positive electrode of the diode five (D5), the negative electrode of the diode four (D4) and the negative electrode of the diode five (D5) are electrically connected to the No. 1 interface of the three-terminal voltage regulator chip three (V3), the connection circuit between the negative electrode of the diode five (D5) and the No. 1 interface of the three-terminal voltage regulator chip three (V3) is electrically connected to the other end of the energy storage capacitor four (EC4), and the No. 3 interface of the three-terminal voltage regulator chip three (V3) is electrically connected to the No. 1 port of the interface terminal two (CN2),The connection circuit between the No. 3 interface of the three-terminal voltage regulator chip three (V3) and the No. 1 port of the interface terminal two (CN2) is electrically connected to the other end of the energy storage capacitor five (EC5) and the No. 1 port of the interface terminal three (CN3), the No. 2 port of the interface terminal two (CN2) is electrically connected to the No. 2 port of the interface terminal three (CN3), and the No. 1 port and the No. 2 port of the interface terminal two (CN2) and the interface terminal three (CN3) are electrically connected to the +12V output interface respectively.

6. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 5 is characterized in that: The high voltage sampling circuit includes an inductor 1 (L1), a capacitor 19 (C19), a variable resistor 1 (VR1), a varistor 3 (RV3), an operational amplifier 4 (U4-A) and a resistor 25 (R25); One end of the inductor 1 (L1) is electrically connected to the BY-3 port, the other end of the inductor 1 (L1) is electrically connected to one end of the resistor 30 (R30), the connection circuit between the inductor 1 (L1) and the resistor 30 (R30) is electrically connected to one end of the capacitor 19 (C19) and one end of the fixed end of the variable resistor 1 (VR1), the other end of the capacitor 19 (C19) and the other end of the fixed end of the variable resistor 1 (VR1) are grounded, the other end of the resistor 30 (R30) is electrically connected to one end of the resistor 29 (R29), the connection circuit between the resistor 30 (R30) and the resistor 29 (R29) is electrically connected to the variable resistor 19 (VR1). The sliding end of variable resistor 1 (VR1) is electrically connected to one end of capacitor 18 (C18), the other end of capacitor 18 (C18) is grounded, the other end of resistor 29 (R29) is electrically connected to one end of varistor 3 (RV3), the other end of varistor 3 (RV3) is grounded, the connection circuit between resistor 29 (R29) and varistor 3 (RV3) is electrically connected to port No. 2 of operational amplifier 4 (U4-A), port No. 2 of operational amplifier 4 (U4-A) is electrically connected to one end of resistor 28 (R28), port No. 2 of operational amplifier 4 (U4-A) is electrically connected to one end of resistor 28 (R28), and port No. 2 of operational amplifier 4 (U4-A) is electrically connected to resistor 28 ( The connection circuit between the resistor 28 (R28) and the resistor 27 (R27) is electrically connected to the P1_7 port, the P1_7 port is electrically connected to the pin 6 of the microcontroller three (U3), the connection circuit between the resistor 28 (R28) and the resistor 27 (R27) ... The connecting circuit is electrically connected to one end of capacitor seventeen (C17), the other end of capacitor seventeen (C17) is grounded, interface No. 3 of operational amplifier four (U4-A) is electrically connected to one end of resistor twenty-five (R25), the other end of resistor twenty-five (R25) is grounded, interface No. 4 of operational amplifier four (U4-A) is grounded, interface No. 8 of operational amplifier four (U4-A) is electrically connected to one end of capacitor fifteen (C15), the other end of capacitor fifteen (C15) is grounded, and the connecting circuit between interface No. 8 of operational amplifier four (U4-A) and capacitor fifteen (C15) is electrically connected to the +5V output interface.

7. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 6 is characterized in that: The communication and output interface circuit includes a resistor 2 (R2), a driver chip 7 (U7), a transistor 1 (Q1), a voltage stabilizing diode 3 (TVS3), a voltage stabilizing diode 4 (TVS4) and an interface terminal 1 (CN1); One end of the resistor 2 (R2) is electrically connected to the TXD port, the other end of the resistor 2 (R2) is electrically connected to the base of the transistor 1 (Q1), the emitter of the transistor 1 (Q1) is electrically connected to the +5V output interface, the collector of the transistor 1 (Q1) is electrically connected to the No. 2 pin of the driver chip 7 (U7), the connection circuit between the collector of the transistor 1 (Q1) and the No. 2 pin of the driver chip 7 (U7) is electrically connected to one end of the resistor 43 (R43), the No. 1 pin of the driver chip 7 (U7) is electrically connected to the RXD port, the connection circuit between the No. 2 pin of the driver chip 7 (U7) and the resistor 43 (R43) is electrically connected to the driver chip Pin 3 of chip 7 (U7) is electrically connected, pin 4 of driver chip 7 (U7) is electrically connected to the TXD port, the other end of resistor 43 (R43) is grounded, pin 5 of driver chip 7 (U7) is grounded, pin 6 of driver chip 7 (U7) is electrically connected to 485A port, the connection circuit between pin 6 of driver chip 7 (U7) and 485A port is electrically connected to the negative electrode of voltage regulator diode 4 (TVS4), pin 7 of driver chip 7 (U7) is electrically connected to 485B port, the connection circuit between pin 7 of driver chip 7 (U7) and 485B port is electrically connected to one end of resistor 46 (R46) and voltage regulator The cathode of diode three (TVS3) is electrically connected, the other end of resistor forty-six (R46), the anode of Zener diode four (TVS4) and the anode of Zener diode three (TVS3) are grounded, the connection circuit between port 485A and Zener diode four (TVS4) is electrically connected to one end of resistor forty-five (R45) and one end of resistor forty-four (R44), the connection circuit between port 485B and Zener diode three (TVS3) is electrically connected to the other end of resistor forty-five (R45), pin 8 of driver chip seven (U7) is electrically connected to the other end of resistor forty-four (R44), and pin 8 of driver chip seven (U7) is electrically connected to the other end of resistor forty-four (R44). The connection circuit between resistor forty-four (R44) is electrically connected to the +5V output interface and one end of capacitor sixteen (C16), the other end of capacitor sixteen (C16) is grounded, port No. 1 of interface terminal one (CN1) is electrically connected to port 485B, port No. 2 of interface terminal one (CN1) is electrically connected to port 485A, port No. 7 of interface terminal one (CN1) is electrically connected to the WASH port, port No. 8 of interface terminal one (CN1) is electrically connected to the ERR port, port No. 9 of interface terminal one (CN1) is electrically connected to the WORK port, and port No. 10 of interface terminal one (CN1) is electrically connected to the +15V output interface.

8. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 7 is characterized in that: The output indication circuit comprises a driving chip 1 (U1), an indicator light 2 (LED2) and a resistor 1 (R1); Pin 1 of the driver chip 1 (U1) is electrically connected to the P5_5_R port, the P5_5_R port is electrically connected to pin 9 of the single-chip computer 3 (U3), pin 2 of the driver chip 1 (U1) is electrically connected to the P1_6 port, the P1_6 port is electrically connected to pin 5 of the single-chip computer 3 (U3), pin 3 of the driver chip 1 (U1) is electrically connected to the P1_4 port, the P1_4 port is electrically connected to pin 3 of the single-chip computer 3 (U3), pin 4 of the driver chip 1 (U1) is electrically connected to the P1_3_G port, the P1_3_G port is electrically connected to pin 2 of the single-chip computer 3 (U3), pin 4 of the driver chip 1 (U1) is electrically connected to the P1_4 port, the P1_4 port is electrically connected to pin 3 of the single-chip computer 3 (U3), The connection circuit between the _3_G ports is electrically connected to pin 6 of the driver chip one (U1), pin 5 of the driver chip one (U1) is electrically connected to the P1_2_Y port, the P1_2_Y port is electrically connected to pin 1 of the single-chip computer three (U3), the connection circuit between pin 5 of the driver chip one (U1) and the P1_2_Y port is electrically connected to pin 7 of the driver chip one (U1), pin 8 of the driver chip one (U1) is grounded, pin 9 of the driver chip one (U1) is electrically connected to the +15V output interface, pin 10 of the driver chip one (U1) is electrically connected to one end of the resistor five (R5), and the other end of the resistor five (R5) is connected to the WAS The H port is electrically connected, the No. 11 pin of the driver chip 1 (U1) is electrically connected to one end of the resistor 6 (R6), the other end of the resistor 6 (R6) is electrically connected to the WORK port, the No. 12 pin of the driver chip 1 (U1) is electrically connected to one end of the resistor 3 (R3), the other end of the resistor 3 (R3) is electrically connected to the positive pole of the indicator light 3 (LED3), the negative pole of the indicator light 3 (LED3) is electrically connected to the +15V output interface, the No. 13 pin of the driver chip 1 (U1) is electrically connected to one end of the resistor 4 (R4), the other end of the resistor 4 (R4) is electrically connected to the positive pole of the indicator light 2 (LED2), the negative pole of the indicator light 2 (LED2) is electrically connected to the +15V output interface. The interface is electrically connected, pin 16 of driver chip one (U1) is electrically connected to one end of resistor one (R1), the other end of resistor one (R1) is connected to the ERR port, the P5_5_R port is electrically connected to one end of resistor twenty-three (R23), the other end of resistor twenty-three (R23) is electrically connected to the positive pole of indicator light four (LED4), the negative pole of indicator light four (LED4) is grounded, the P5_4 port is electrically connected to one end of resistor twenty (R20), the P5_4 port is electrically connected to pin 7 of microcontroller three (U3), the other end of resistor twenty (R20) is electrically connected to the positive pole of indicator light five (LED5), and the negative pole of indicator light five (LED5) is grounded.

9. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 8 is characterized in that: The relay state circuit comprises two groups of relays, the output ports of the two groups of relays are respectively electrically connected to the ports of the single chip computer three (U3), and the connectors of the two groups of relays are respectively electrically connected to the power input terminals of the external devices.

10. The high-voltage constant-voltage digital power supply for oil fume purification according to claim 9, characterized in that: The digital tube display circuit includes a driving chip five (U5), a digital tube six (LED6), an energy storage capacitor seven (EC7) and a capacitor twenty-two (C22); Interface No. 1 of the driver chip 5 (U5) is electrically connected to the DIG1 port, interface No. 2 of the driver chip 5 (U5) is electrically connected to one end of resistor 38 (R38), the other end of resistor 38 (R38) is electrically connected to the P3_4 port, the P3_4 port is electrically connected to pin No. 15 of the single-chip computer 3 (U3), interface No. 3 of the driver chip 5 (U5) is electrically connected to one end of resistor 36 (R36), the other end of resistor 36 (R36) is electrically connected to the P3_5 port, the P3_5 port is electrically connected to pin No. 16 of the single-chip computer 3 (U3), interface No. 4 of the driver chip 5 (U5) is grounded, interface No. 5 of the driver chip 5 (U5) is connected to the DIG2 port The interface No. 6 of the driving chip five (U5) is electrically connected to the DIG3 port, the interface No. 7 of the driving chip five (U5) is electrically connected to the DIG4 port, the interface No. 8 of the driving chip five (U5) is electrically connected to the DIG2 port, the interface No. 9 of the driving chip five (U5) is electrically connected to the B port, the interface No. 10 of the driving chip five (U5) is electrically connected to the +5V output interface, the connection circuit between the interface No. 10 of the driving chip five (U5) and the +5V output interface is electrically connected to one end of the energy storage capacitor seven (EC7), the connection circuit between the interface No. 10 of the driving chip five (U5) and the energy storage capacitor seven (EC7) is electrically connected to one end of the capacitor twenty-two (C22), and the energy storage capacitor The other end of capacitor seven (EC7) and the other end of capacitor twenty-two (C22) are grounded, interface No. 11 of driver chip five (U5) is electrically connected to C port, interface No. 12 of driver chip five (U5) is electrically connected to D port, interface No. 13 of driver chip five (U5) is electrically connected to E port, interface No. 14 of driver chip five (U5) is electrically connected to F port, interface No. 15 of driver chip five (U5) is electrically connected to G port, interface No. 16 of driver chip five (U5) is electrically connected to DP port, interface No. 1 of digital tube six (LED6) is electrically connected to E port, interface No. 2 of digital tube six (LED6) is electrically connected to D port, interface No. 3 of digital tube six (LED6) is electrically connected to The DP port is electrically connected, interface No. 4 of the digital tube six (LED6) is electrically connected to the C port, interface No. 5 of the digital tube six (LED6) is electrically connected to the G port, interface No. 6 of the digital tube six (LED6) is electrically connected to the DIG4 port, interface No. 7 of the digital tube six (LED6) is electrically connected to the B port, interface No. 8 of the digital tube six (LED6) is electrically connected to the DIG3 port, interface No. 9 of the digital tube six (LED6) is electrically connected to the DIG2 port, interface No. 10 of the digital tube six (LED6) is electrically connected to the F port, interface No. 11 of the digital tube six (LED6) is electrically connected to the A port, and interface No. 12 of the digital tube six (LED6) is electrically connected to the DIG1 port. The key input circuit includes a switch one (SW1), a key one (KEY1), a resistor forty (R40), and a resistor forty-one (R41); Interface No. 3 at one end of the switch 1 (SW1) is electrically connected to port P3_3, port P3_3 is electrically connected to pin No. 14 of single-chip computer 3 (U3), interface No. 4 at one end of the switch 1 (SW1) is electrically connected to one end of resistor 41 (R41), the other end of resistor 41 (R41) is electrically connected to port P3_4, port P3_4 is electrically connected to pin No. 15 of single-chip computer 3 (U3), the other end of the switch 1 (SW1) is grounded, one end of resistor 40 (R40) is electrically connected to port DIG4, the other end of resistor 40 (R40) is electrically connected to one end of key 1 (KEY1), key 2 (KEY2), key 3 (KEY3) and key 4 (KEY4), and the other ends of key 1 (KEY1), key 2 (KEY2), key 3 (KEY3) and key 4 (KEY4) are electrically connected to port E, port D, port G and port A respectively.

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