Circuit for protecting a load control device from high and low v

Details Circuit for protecting a load control device from high and low v Circuit for protecting a load control device from high and low v

1994-01-27

1996-01-09

Beausoliel, Jr., Robert W.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 64, G11C 700, H03K 1700

Patent

active

054836352

ABSTRACT:
A protective device for a load-control device which provides preservation of the load-control function of a CPU and prevents misoperation, even if an abnormality occurs, and which comprises a CPU, controlling load in response to sensor signals; a DC voltage-regulation circuit, supplying voltage to the CPU; a current-adjustment means operating so that the power supply line voltage and the DC voltage-regulation circuit output voltage are equal; a voltage-responding means which switches off the current-adjustment means when the power supply line voltage exceeds a prescribed upper limit level; a switching means switching the current-adjustment means off; and a voltage comparison means switching off the current-adjustment means when the power supply line voltage falls below a lower limit level, and wherein the CPU intermittently operates the switching means when the current-adjustment means is switched off.

REFERENCES:
patent: 4010381 (1977-03-01), Fickenscher et al.
patent: 4336593 (1982-06-01), Takase
patent: 5019717 (1991-05-01), McCurry et al.
patent: 5281955 (1994-01-01), Reich et al.
patent: 5381554 (1995-01-01), Langer et al.
Lee et al., Uninterruptable Power Supply for a Computerised On-Line System, 1989 Annual Meeting of the Industry Application Society, at 1813.
Herman, UPS Trends: What's New with the Mother of All Power Protection?, Teleconnect, Nov. 1991, at 77.
Warren, Increasing UPS and Computer Reliability in Large Installations, 1992 Annual Meeting of the Industry Application Society, at 1991.

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