Power recovery circuit

Details Power recovery circuit Power recovery circuit

1988-05-17

1989-05-30

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including means for using, or compensating for, the induced...

361156, 4001572, H01H 4700, H01H 4732, B41J 900

Patent

active

048356557

ABSTRACT:
Power recovery circuit for printer haivng printing elements actuated by electromagnets energized by a voltage VS available at a terminal. The circuit includes a voltage booster for generating a voltage HV higher than voltage VS at a node and a buffer capacitor charged by the voltage HV and connected between the terminal and the node, a connection between the electromagnets and the node for transferring the magnetic energy imparted to the electromagnets by the buffer capacitor for storing therein as capacitive energy, an inductor and a control switch, series connected between the node and the terminal, a recirculation diode connected between ground and the node common to the switch and the inductor, a voltage detector providing an enabling signal when voltage HV exceeds a predetermined level and a controlled oscillator, enabled by the enabling signal to generate a control signal which periodically switches the control switch on and off.

REFERENCES:
patent: 4336587 (1982-06-01), Boettcher et al.
patent: 4637742 (1987-01-01), Sakai
patent: 4661882 (1987-04-01), Presley

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