Discharge trigger and hold circuit of aero-engine variable frequency variable energy ignition device

Abstract

The invention provides a discharge triggering retaining circuit for a frequency variable and energy variable ignition device of an aero-engine. The circuit comprises a capacitor C7, silicon controlledQ4 and a triode Q3. When a voltage arriving detection signal is in a high level, the capacitor C7 generates a sharp pulse signal to trigger the silicon controlled Q4 to be conducted so as to furtherconduct the Q3 and generates one control signal to control a previous stage input circuit to be in a disconnected state while generates another control signal to trigger a post circuit to discharge ifbeing delayed for 2 ms; the silicon controlled Q4 is in a conducted state if being conducted till the post circuit discharges over, a frequency control signal turns to a low level, and the controlledsilicon Q4 is cut off and the Q3 is cut off then; a signal of the previous input circuit is turned to a low level, the previous circuit is conducted, a boosted circuit starts to work till the voltages at two ends of an energy storage capacitor arrive a set value, the pressure arriving detection signal is in the high level, and circulation is carried out to achieve output of the discharge triggering retaining circuit for the frequency variable and energy variable ignition device of the aero-engine according to a set frequency. The circuit solves the interference problem effectively and guarantees the corrective logic sequence of the circuit, so that the circuit can work normally.

Description

technical field [0001] The invention belongs to the field of aviation and aerospace engine ignition, and relates to a discharge trigger holding circuit of an aeroengine variable frequency variable energy ignition device. Background technique [0002] In the traditional aero-engine ignition device, neither the energy storage energy nor the discharge frequency can be adjusted, or the discharge frequency can be adjusted and controlled when the energy storage energy remains unchanged. [0003] For this reason, the applicant proposed a high-voltage discharge trigger circuit (CN201711096852.5) ​​for an aircraft engine ignition device in 2017, which can realize adjustable control of energy storage and discharge frequency. The block diagram of the circuit is shown in figure 1 , including an AC boost circuit, a rectifier energy storage circuit, a voltage detection control circuit, a discharge trigger circuit, a discharge control circuit, a secondary boost circuit, and an arc ignition...

AI Technical Summary

Problems solved by technology

However, the integrated circuit has poor tolerance to electromagnetic interference. When the output power of the ignition device circuit reaches more than 130W, that is, when the energy storage reaches more than 10J, and the discharge frequency reaches more than 10Hz, there will be relatively large electromagnetic interference in the charging and discharging process of the main energy storage circuit. , so that the logic operation performance of the integrated circuit is affected, and the output logic relationship is wrong and chaotic, resulting in the output control signal not being output correctly, resulting in product work compensation and even overloading of power supply and other equipment.

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