Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1994-06-29
1996-07-02
Shoop, Jr., William M.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 318138, 318484, 3889072, 363128, 363 54, 363 58, H01R 3946
Patent
active
055325629
ABSTRACT:
A control circuit for an H-bridge circuit comprises a single capacitor, a charge/discharge circuit for charging/discharging the capacitor in response to a control command signal, a voltage detector circuit for detecting a voltage appearing across the capacitor and a hold circuit for holding the control command signal in response to of a predetermined voltage detected by the voltage detection circuit. Charge and discharge of the capacitor is controlled in dependence on changes in the control command signal to thereby prevent occurrence of a through-current flow in the H-bridge circuit while allowing the bridge circuit to be changed over to the operation state indicated by the control command signal after lapse of charge/discharge period. The control circuit for the H-bridge circuit can be implemented in a miniaturized size with high reliability of operation while decreasing the number of elements attached externally even in the case where the control circuit is implemented in the form of an integrated circuit.
REFERENCES:
patent: 3701934 (1972-10-01), Guidicelli
patent: 4051418 (1977-09-01), O'Berto et al.
patent: 4240014 (1980-12-01), Muller
patent: 4325011 (1982-04-01), Peterson
patent: 4443744 (1984-04-01), Konrad
patent: 5068582 (1991-11-01), Scott
Masth Karen
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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