High voltage detecting circuit

Details High voltage detecting circuit High voltage detecting circuit

1987-03-19

1989-03-14

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307354, 307362, H03K 5153, H03K 524

Patent

active

048126802

ABSTRACT:
A high voltage detecting circuit included in a semiconductor device having terminals for generating a control signal in order to start a specific mode of the semiconductor device when a potential of a specific mode signal higher by a predetermined value than a normal input voltage having a predetermined range is applied to at least one of the terminals of the semiconductor device. The high voltage detecting circuit comprises a level shift means having an input end and an output end and connected between a blocking transistor and a discrimination circuit for obtaining a potential of the output end lower by a level shift valve than a potential of the input end. Consequently, the high voltage detecing circuit will not generate an error control signal even if the semiconductor device is switched ON and a power line potential of the device is gradually increased while a normal mode signal of the normal input voltage is continuously applied to the terminal of the semiconductor device.

REFERENCES:
patent: 4024415 (1977-05-01), Matsuura
patent: 4301380 (1981-11-01), Thomas
patent: 4321489 (1982-03-01), Higuchi et al.
patent: 4626704 (1986-12-01), Takata et al.
patent: 4658156 (1987-04-01), Hashimoto
European Search Report, The Hague, 03-25-88.

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