Direct-current load driving protection circuit

Abstract

The invention discloses a direct-current load driving protection circuit, which comprises a power control circuit, a current signal acquisition and conditioning circuit, a comparison circuit and a logic judgment circuit; the power control circuit controls on and off of an MOSFET power tube through a photoelectric coupler and a divider resistor, and the power loop adopts a structure that the MOSFET power tube and a power relay are connected in series; the current signal acquisition and conditioning circuit converts a current signal into a voltage signal through an isolated current sensor, and the voltage signal enters a comparison circuit after being processed by a differential amplification circuit; the comparison circuit compares the over-current signal voltage value with an over-current threshold value and outputs an over-current protection signal; and the logic judgment circuit receives the overcurrent protection signal, performs OR operation on the overcurrent protection signal and a control signal output by the CPU circuit, and outputs an MOSFET power tube control signal to the power control circuit to control turn-off protection of the MOSFET power tube. The protection circuit is high in real-time performance, simple in circuit design and high in reliability.

Description

Technical field [0001] The present invention belongs to the field of electrical technology, it relates to a direct-current load driving circuit protection. Background technique [0002] With the upgrading of airborne products, traditional mechanical transmission mechanism has been replaced by electric drive, power transmission to transmit electrical energy is accomplished by way of electrical conductors, electric drive not only reduces airborne product weight, and reduced ground maintenance equipment, plus on its strong fault-tolerant, making the aircraft's reliability, maintainability, economy improved greatly, at present, electric drive actuator main actuators, electric valves, valves and other intelligence, to ensure the reliability and actuators life, the protection circuit to drive a higher requirement, at present, the actuator forward intelligent, integrated development drive components, namely the implementing agencies not only integrated power circuit further includes a c...

AI Technical Summary

Problems solved by technology

[0002] With the upgrading of airborne products, the traditional mechanical mechanism transmission has been replaced by electric transmission, and the power transmission is completed through electric wires in the form of electric energy transmission. Electric transmission not only reduces the weight of airborne products, but also reduces ground maintenance equipment and increases In addition, its fault tolerance is strong, which greatly improves the reliability, maintainability and economy of the aircraft. At present, the actuators of electric transmission mainly include actuators, electric valves, intelligent valves, etc. In order to ensure the reliability and Life expectancy puts forward higher requirements for the drive protection circuit. At present, the actuator is developing towards intelligent and integrated drive components, that is, the actuator not only integrates the power circuit, but also includes the control circuit and the processing circuit. Due to the limitation of the structural space of the actuator, It is impossible to use a large number of acquisition circuits and processing circuits. Therefore, in order to meet the design requirements of new actuators, it is necessary to design a simple, reliable and fast protection drive protection circuit.

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