Safe control of a brake using low power control devices
作者： Juergen Gewinner , Marvin Dehmlow
DOI:
关键词: Solid-state relay 、 Elevator 、 Engineering 、 Pulse-width modulation 、 Safety relay 、 Control theory 、 Power control 、 Secondary circuit 、 Transformer 、 Brake
摘要: A control circuit selectively energizes a load, such as an elevator or escalator brake (28). The includes transformer (12) with primary- winding connected to series semiconductor switch (40) that is driven by pulse width modulation (PWM) controller. Power the PWM controller supplied through safety relay contacts (52A, 52B). When load be energized, are closed and drives supply energy secondary circuit. command signal circuitry (64) causes power in applied (12). If open, turns off no longer delivered load.
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