Isolation high-voltage switching control circuit for single-chip microcomputer

Abstract

The invention discloses an isolation high-voltage switching control circuit for a single-chip microcomputer, and the circuit comprises an MCU, wherein one pin is electrically connected with a control end of a switch S2, and one contact of the switch S2 is electrically connected with a transformer T2. The other contact of the switch S2 is grounded. One pin of the MCU is electrically connected with the control end of a switch S1, and one contact of the switch S1 is electrically connected with a transformer T1. The other contact of the switch S1 is grounded. The transformer T2 is electrically connected with the positive electrode of a diode D2, and the negative electrode of the diode D2 is connected with a resistor R3. The resistor R3 is electrically connected with a capacitor C2 and the G level of a field-effect tube Q2. A transformer T1 is electrically connected with the positive electrode of a diode D1, and the negative electrode of the diode D1 is electrically connected with a resistor R1. The resistor R1 is electrically connected with a capacitor C1 and the G level of a field-effect tube Q1. The circuit increases the withstand voltages of a transformer and a switch, and solves a problem of switching control of a kilovolt-level insulating monitor.

Description

technical field [0001] The invention relates to the technical field of switch negative pressure, in particular to an isolated high-voltage switch control circuit for a single-chip microcomputer. Background technique [0002] Insulation monitor: a device specially used to measure insulation; photoMOS (optical MOS): it is a device that uses light as a medium to transmit electrical signals. ) are packaged in the same package. At present, the traditional technology is to use the negative voltage of optical MOS switch. If the negative voltage reaches more than 800V, there is and only Panasonic's AQV258 can be used as a switch. [0003] Off, and this switch is subject to many restrictions such as foreign imports, and the cost is relatively high. [0004] At present, the traditional technology is to use the negative voltage of optical MOS switch. If the negative voltage reaches more than 800V, there is and only Panasonic's AQV258 can be used as a switch. The customer's use, and ...

AI Technical Summary

Problems solved by technology

[0003] Off, and this switch is subject to many restrictions such as foreign imports, and the cost is relatively high

[0004] At present, the traditional technology is to use the negative voltage of optical MOS switch. If the negative voltage reaches more than 800V, there is and only Panasonic's AQV258 can be used as a switch. Customer's use, and the highest voltage can only be 1500V

[0005] Another solution is to use relays, and the cost of high-voltage relays is more than twice that of optical MOS switches, and it is extremely difficult to purchase. Domestic ordinary relays can only achieve 500V withstand voltage at present, and the volume is large, which is not conducive to the miniaturization of insulation monitors.

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