Firing control oscillator for a solid state switch

Details Firing control oscillator for a solid state switch Firing control oscillator for a solid state switch

1975-10-28

1977-11-08

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318139, 318341, 323 18, H02P 700

Patent

active

040577520

ABSTRACT:
An oscillator for use in a silicon controlled rectifier (SCR) control for direct current powered loads and for repeatedly gating on the main SCR of the control at an operator-selected frequency. Operation of the oscillator is delayed on start-up to avoid erratic operation due to contact bounce. The pulse frequency of the oscillator increases and decreases linearly at different settable rates even though the accelerator control is abruptly changed. The oscillator is automatically turned off in the event the load is to be disconnected from the power source so that the disconnection will not break current.

REFERENCES:
patent: 3361921 (1968-01-01), Montross et al.
patent: 3484652 (1969-12-01), Thiele
patent: 3593075 (1971-07-01), Pantelakis

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