Double-isolation power amplifier circuit

Abstract

The invention discloses a double-isolation power amplifier circuit which comprises an optocoupler isolation circuit, a logic control circuit, an H-bridge drive circuit, an H-bridge circuit, a power circuit and an overvoltage and overcurrent protection circuit. The optocoupler isolation circuit is connected with the input end of the H-bridge drive circuit through the logic control circuit. The output end of the H-bridge drive circuit is connected with the H-bridge circuit; the power supply circuit is connected with the H-bridge drive circuit and the H-bridge circuit. And the output end of the H-bridge circuit is connected with the overvoltage and overcurrent protection circuit. The motor positive end and the motor negative end of the H-bridge circuit adopt two freewheeling modes of diode upward freewheeling and diode downward freewheeling at the same time, so that the motor voltage can be prevented from exceeding the power supply voltage; in the H-bridge circuit, a capacitor and a resistor are connected in series for follow current voltage stabilization, the influence of power supply fluctuation and an external magnetic field on motor operation indexes can be prevented, and the circuit reliability and the circuit stability are improved.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to a double-isolated power amplifier circuit. Background technique [0002] At present, the motor drive circuit used in the missile tractor control system generally adopts the input optocoupler isolation, and the pulse width modulation signal is converted into two complementary pulse width modulation signals through a resistor and a NOT gate circuit, and the two complementary pulse signals are regenerated. To control the H bridge, the disadvantages of this circuit are: [0003] (1) The working voltage range is narrow; [0004] (2) The protection against surge voltage is very small; [0005] (3) Low anti-interference ability; [0006] (4) Low ability to resist power supply voltage interference; [0007] (5) Low adaptability to electromagnetic compatibility; [0008] Can not meet the technical requirements of modern military electronic control system. Contents of the invention...

AI Technical Summary

Problems solved by technology

[0003] (1) The working voltage range is narrow;

[0004] (2) The protection against surge voltage is very small;

[0005] (3) Low anti-interference ability;

[0006] (4) Low ability to resist power supply voltage interference;

[0007] (5) Low adaptability to electromagnetic compatibility;

[0008] Can not meet the technical requirements of modern military electronic control system

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