Switched regulator circuit having an extended duty cycle range

Details Switched regulator circuit having an extended duty cycle range Switched regulator circuit having an extended duty cycle range

1986-01-06

1987-03-24

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

363 21, 363 56, G05F 146

Patent

active

046528091

ABSTRACT:
In a DC switching regulator circuit, a circuit to demagnetize the transformer during OFF periods to extend the duty cycle range of the regulator. The regulator uses a transformer in series with an FET switch device to cause the primary transformer current to be switched ON and OFF in response to the power needs of an electrical load connected to the secondary circuit. A first diode, connected to the junction of the primary winding and a series switch, conducts the demagnetizing energy out of the primary circuit into a shunt connected storage capacitor. A second FET switch, operating out of phase with the first switch, allows the storage capacitor to discharge through an inductor back to the unregulated input source. A shunt diode between the inductor and the second FET switch provides a path for the inductor to discharge through when the second switch opens the path between the storage capacitor and the inductor.

REFERENCES:
patent: 4268898 (1981-05-01), Brown
patent: 4337404 (1982-06-01), Kindell
patent: 4370701 (1983-01-01), Western
patent: 4389702 (1983-06-01), Clemente et al.
M. M. Sathe, "Coupled Inductor Lossless Snubber Circuit for a Transistor Switching Converter", IBM Technical Disclosure Bulletin, vol. 26, No. 10A, Mar. 1984, pp. 5210-5213.

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