Buck-boost regulated D.C. to D.C. power supply

Details Buck-boost regulated D.C. to D.C. power supply Buck-boost regulated D.C. to D.C. power supply

1983-02-03

1985-10-22

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363101, 323222, 323224, 323259, H02P 1322

Patent

active

045492549

ABSTRACT:
A regulated power supply for supplying DC output voltage and current to an electronic control system of an internal combustion engine, designed especially for automotive applications and cold cranking conditions encountered therein, is disclosed. The power supply has a series switching regulator section having a transformer provided with two windings, and a shunt switching regulator section that shares the transformer with the series regulator section. When normal battery voltages are available, the power supply through its series regulator section operates in a voltage dropping mode, intermittently passing current through the primary winding of the transformer to maintain the desired output voltage. When low battery voltages are encountered, such as during cold cranking conditions, the shunt regulator section of the power supply operates in a voltage boosting mode to maintain the desired output voltage. The voltage boosting function is accomplished by intermittently shunting current from the primary winding towards ground, and utilizing the resultant magnetic energy stored in the core of the transformer to boost the voltage available to the load. Mutual inductance between the primary and secondary windings allows energy stored in the core of the transformer as a result of current flowing through the primary winding to be beneficially delivered through the secondary winding to the output of the power supply during both modes of power supply operation, thereby improving overall power supply efficiency and reducing power supply cost and complexity.

REFERENCES:
patent: 4055740 (1977-10-01), Nakamura et al.
patent: 4084219 (1978-04-01), Furukawa et al.
patent: 4168477 (1979-09-01), Burchall
patent: 4245286 (1981-01-01), Paulkovich et al.
IBM Disclosure Bulletin; vol. 22, #7, Dec. 1979.
Johnson; High-Voltage Power Supply . . . ; Apr. 1, 1975; Electronic Design.

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