Passive quick turn-off circuit and turn-off method for airborne bus bar contactor
A technology for shutting off circuits and contactors, applied in circuit devices, emergency protection circuit devices, protection against under-voltage or no-voltage, etc., can solve the problems of increased volume, weight, increased electromagnetic protection, complicated circuits, etc. Achieving the effect of simple circuit and improved reliability
Active Publication Date: 2020-06-05
汉中一零一航空电子设备有限公司
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Problems solved by technology
In this way, it is necessary to increase the power conversion circuit, and the corresponding peak surge protection circuit, energy storage circuit, filter circuit, etc., resulting in complex circuits, reduced reliability, and increased volume and weight;
[0009]2) The electromagnetic environment on board is complex, especially in high-power conventional power distribution equipment, circuits such as comparators and processors are easily disturbed, and electromagnetic protection must be increased;
[0010]Based on the above two reasons, these two methods are basically impossible to implement in the airborne power distribution
Method used
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[0024] The present invention is further described below in conjunction with accompanying drawing:
[0025] see figure 1 and figure 2 , an airborne bus bar contactor passive rapid shutdown circuit, including a threshold switch circuit and a drive circuit; the threshold switch circuit is connected to the drive circuit, and the threshold switch circuit receives a voltage for switching the bus bar under the control of the threshold switch circuit The contactor shuts off quickly.
[0026] The threshold switch circuit includes diode D1, diode D2, current limiting resistor R1, resistor R3, TVS tube D3, voltage regulator tube D4, power resistor R2, capacitor C1, capacitor C2, capacitor C3 and transistor Q1; one end of diode D1 and diode D2 Connect the voltage respectively, the other end is connected to the current limiting resistor R1, the current limiting resistor R1 is connected to the TVS tube, and the TVS tube is grounded; the capacitor C1, the capacitor C2, the capacitor C3 an...
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The invention relates to a passive quick turn-off circuit and turn-off method for an airborne bus bar contactor. The passive quick turn-off circuit comprises a threshold switch circuit and a driving circuit, and the threshold switch circuit is connected with the driving circuit, receives the voltage and is used for quickly switching off the bus bar contactor under the control of the threshold switch circuit. The framework of the threshold switch circuit and the output drive circuit is used for quickly driving the contactor to act, it is guaranteed that the power conversion time is shorter than50 ms, when the circuit breaks down or is damaged, conduction of the contactor is not affected, the bus bar voltage can normally supply power to a rear-stage load, and the reliability of a power supply system is improved.
Description
technical field [0001] The invention belongs to the field of aviation airborne power distribution, and in particular relates to a passive rapid shutdown circuit and a shutdown method of an airborne bus bar contactor. Background technique [0002] Contactors are the main components of modern aviation airborne power distribution. They are widely used in the field of aviation power distribution to realize the power switching and on-off control of the main power supply of the aircraft and high-power electrical equipment. [0003] Most of the current airborne power distribution systems use relay interlocking logic to realize the automatic conversion control of the power supply. In order to ensure the normal operation of the on-board equipment, according to the relevant regulations of GJB181, it is required that when the bus bar is switched, the power supply interruption time shall not exceed 50mS. However, because most of the equipment connected to the bus bar of the carrier con...
Claims
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Login to View More IPC IPC(8): H02H3/24H02H3/02
CPCH02H3/24H02H3/021
Inventor 马立伟严桂荣王大龙井皓李景涛
Owner 汉中一零一航空电子设备有限公司