Load control system

Details Load control system Load control system

1987-06-19

1988-11-22

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

363 17, 318681, H01H 4700, H02M 3337

Patent

active

047868228

ABSTRACT:
A load control system (10) generates a periodic failsafe signal (CO) and two control signals. The failsafe signal (CO) is used to drive a charge (20) pump which acts as a voltage multiplier to generate an enable signal. A DC bridge circuit (30) includes four n-channel MOSFETs (Q1-Q4), and the load control signals are used to close respective diagonally opposed pairs of the MOSFETs to apply voltage to a load. The load control signals also isolate selected switch drivers (K1-K4) from a power supply in order to prevent shorting of the bridge (30). The enable signal generated by the charge pump (20) is applied to two of the MOSFETs, and voltages are selected such that the MOSFETs will not close unless the enable signal is at a sufficiently high level to indicate proper oscillation of the failsafe signal (CO).

REFERENCES:
patent: 4586118 (1986-04-01), Mihalka

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