Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1979-07-20
1981-06-09
Shoop, William M.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 34, 363 89, H02M 706
Patent
active
042728070
ABSTRACT:
A DC power supply is disclosed which returns excessive regenerative energy to the AC line. The regenerative power supply generates a DC bus voltage from an AC power line and regulates the maximum DC bus voltage by returning to the AC power line energy supplied through the DC bus from the load. A conventional full wave rectifier bridge is used to rectify the incoming AC power line voltage into a DC bus voltage. A capacitor is connected across the DC bus to dampen high frequency transient voltages which may be present on the DC bus voltage. In anti-parallel with each of the rectifying diode circuits is a power transistor which is controllable to allow current conduction in a direction opposite to its associated rectifying diode. Control circuitry, associated with each of the anti-parallel transistors, senses excessive DC bus voltage and initiates conduction of the transistor when the AC power line phases are at the correct potential for receiving the regenerative energy.
REFERENCES:
patent: 3679959 (1972-07-01), Beesley et al.
patent: 3793578 (1974-02-01), Rettig
patent: 3940682 (1976-02-01), Park et al.
patent: 4189764 (1980-02-01), Snyder
Contraves Goerz Corporation
Cornelius Andrew J.
Shoop William M.
Wong Peter S.
Yeager Robert D.
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