A control method and device for a DC contactor for rail transit
A DC contactor, rail transit technology, applied in relays, electrical components, circuits, etc., can solve the problems of increased contact resistance, increased material cost, loose contactor structure, etc., and achieves improved voltage adaptability and temperature adaptability, The effect of prolonging the service life and simple structure
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] Such as Figure 1 to Figure 3 As shown, the control method of the DC contactor for rail transit in this embodiment, the specific process is: in the DC contactor pull-in control stage, output a wide pulse voltage to the DC contactor coil so that the coil current reaches the pull-in current; In the closing and holding phase of the DC contactor, a narrow pulse voltage is output to the coil to reduce the coil current from the pull-in current to the hold current. Since the electromagnetic force of the coil is proportional to the square of the coil current, it has no direct relationship with the voltage; therefore, the present invention takes the coil current as the control target and adopts the voltage source pulse width modulation (PWM) control method; when the power supply voltage is low / high When the pulse width is increased / decreased acc...
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