Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1993-05-27
1994-08-23
Stephan, Steven L.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
G05F 110, G05F 1652, G05F 1656
Patent
active
053410858
ABSTRACT:
A power supply circuit having a standby mode includes an input terminal, an output terminal and a reference terminal. A direct voltage source is connected to the input terminal and the reference terminal and a load is connected to the output terminal and the reference terminal. A series arrangement of an inductive element and a diode are connected to one another at a first node. The inductive element is connected between the input terminal and the first node and the diode is connected between the first node and the output terminal. A first electronic switch has a main current path connected between the first node and the reference terminal. A drive circuit periodically makes the main current path of the first electronic switch conductive and non-conductive. The drive circuit comprises a first switching device for making the main current path of the first electronic switch permanently non-conductive in response to a standby signal (SBS). A second electronic switch has a control electrode and a first and a second main electrode which constitute a main current path connected in parallel with the diode. A second switching device makes the main current path of the second electronic switch permanently conductive in response to the standby signal. In the standby mode the second electronic switch short-circuits the diode whereby more voltage is available at the output terminal.
REFERENCES:
patent: 4311954 (1982-09-01), Capel
patent: 4672303 (1987-06-01), Newton
patent: 4970451 (1990-11-01), Suomalainen
Franzblau Bernard
Stephan Steven L.
To E.
U.S. Philips Corporation
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