A high-power mixed DC contactor and its control method

Abstract

The invention provides a high power mixed direct current contactor and a method thereof, the invention is composed of a direct current contactor main body and an arc extinguishing system. The direct current contactor comprises a movement contact, a main body bracket, an electromagnetic coil and other parts, completing switching effect. The arc extinguishing system comprises a contactor closed electric arc eliminating part and a contactor disconnection arc extinguishing part. The closed electric arc part of the mixed direct current contactor is composed of a electric source switching circuit, a signal separating and collecting circuit, a control circuit and a MOSFET drive circuit; electric power electric switch is switched on and the jumping electric arc is removed by detecting the contact closed signal; the disconnection process contact electric arc eliminating part is composed of a maintaining circuit, a judging circuit, a control switch circuit and an energy absorbing circuit, utilizing the absorption property of the electric power capacitance energy to eliminate the electric arc generated when the contactor contact breaks the high power load; design of a PCB plate distribution is optimized to reduce the influence of parasitical parameters to a maximum extent, enabling the high power mixed direct current contactor to completely eliminate the influence of the electric arc in the process of breaking operation.

Description

(1) Technical field [0001] The invention relates to a high-power hybrid DC contactor based on power electronics technology and capacitor parallel connection technology. (2) Background technology [0002] Railway is an important national infrastructure, national economic artery and popular means of transportation. Accelerating the development of railways plays an important role in promoting economic and social development and realizing the grand goal of building a well-off society in an all-round way. DC electromagnetic contactor is an electrical component widely used in the power supply system of railway locomotives and vehicles, and its reliability and life directly affect the reliability and safety of the entire system. When the DC contactor is connected or disconnected with a high-power load, there will be vibration, vibration, arcing, ablation and other phenomena of the contact, which will cause abnormal contact resistance of the contact, contact bonding and other fault...

AI Technical Summary

Problems solved by technology

In this way, as the power increases, the development cost of this method is higher, and it is easy to cause the electrical breakdown failure of the MOSFET, which has an insurmountable impact on the entire system.

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