Drive circuit for a latching relay

Details Drive circuit for a latching relay Drive circuit for a latching relay

H - Electricity

01

H

348/39

H01H 47/32 (2006.01) H01H 47/22 (2006.01)

Patent

CA 1169953

ABSTRACT OF THE DISCLOSURE A drive circuit for a latching relay wherein a flip-flop responds to a first input signal and to a second input signal entered into the drive circuit and provides alternately a first control signal and an inverse control signal as an output corresponding to a change in the flip-flop's stable condition. A timer is connected to the output of the flip-flop for receiving the first control signal and the inverse control signal and a semiconductor switching circuit is connected to the timer with the timer controlling the semiconductor switching circuit for a constant time period, which produces a control signal in response to a first input signal and an inverse control signal to said control signal in response to a second input signal. The semiconductor switching circuit is adapted for connection to the latching relay with the latching relay receiving from the semiconductor switching circuit a time limit output such that even if said first and second input signals are given to the drive circuit in an extremely short time after said timer responds to said control signal coming from the flip-flop, a sufficient time period is provided for said time limit output in order to energize and keep on said semiconductor switching circuit during the time period of current sufficient for said latching relay and where even when the output of said control signal is cut off between the first input signal and the second input signal, the latching relay keeps its existing relay working condition. The circuit of the invention is fully compatible with computers and integrated circuits which cannot use the large capacity condensers generally required by prior art circuits for driving latching relays.

387539

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