Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-03-27
1982-01-05
Anagnos, Larry N.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307297, 340636, 368 66, H03K 524, H03K 1730, G08B 2100
Patent
active
043096271
ABSTRACT:
A detecting circuit for a power source voltage comprises a reference voltage generating circuit for generating a reference voltage, a voltage dividing circuit for dividing the power source voltage, and a voltage comparing circuit having one input terminal connected to receive the reference voltage from the reference voltage generating circuit and another input terminal connected to receive the divided voltage from the voltage dividing circuit. In one embodiment, the reference voltage generating circuit comprises at least two MOS-transistors having different threshold voltages and having the same polarity, one of the MOS-transistors having its gate and drain connected together with the drain being connected to the gate of the other MOS-transistor, the drain and source of the other MOS-transistor each being connected to a resistor, and the drain of the other MOS-transistor being connected to one input terminal of the voltage comparing circuit. In another embodiment, the reference voltage generating circuit comprises a P-channel MOS-transistor having its drain connected to the drain of the N-channel MOS-transistor and the gates of the P-channel and N-channel MOS-transistors being connected to the drains thereof respectively, one of the MOS-transistors being connected to one terminal of the power source, and the other of the MOS-transistors being connected to one input terminal of the voltage comparing circuit.
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Adams Bruce L.
Anagnos Larry N.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
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