Polyphase source detecting circuit

Details Polyphase source detecting circuit Polyphase source detecting circuit

2007-12-28

2010-10-26

Bugg, George A (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S635000, C340S529000, C340S658000, C324S509000, C361S093100

Reexamination Certificate

active

07821414

ABSTRACT:
A polyphase source detecting circuit configured for detecting a polyphase source having three sources includes three sampling circuits and an alarm circuit. Each sampling circuit has a control switch. A control terminal of the control switch of each sampling circuit is connected to one of the phase sources of the polyphase source respectively. The alarm circuit has a first transistor, a first LED, and a buzzer. The anode of the first LED is connected to a power supply. The cathode of the first LED is connected to the base of the first transistor and connected to ground via the control switches of the sampling circuits in turn. The collector of the first transistor is connected to the power supply via the buzzer. The emitter of the first transistor grounded.

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