Electricity: power supply or regulation systems – Input level responsive
Patent
1990-10-02
1992-02-11
Stephan, Steven L.
Electricity: power supply or regulation systems
Input level responsive
323303, 323908, 361 18, 361 90, 361 91, H02H 902
Patent
active
050878719
ABSTRACT:
A power supply circuit which includes a current limit circuit for limiting the inrush current when the power supply is switched on. The current limit circuit is coupled between a supply voltage at the input end of the power supply and a storage capacitor at the output end of the power supply. The current limit circuit includes a first semiconductor switch having a resistor in parallel with its switching path. In parallel with the control path of the first semiconductor switch is a parallel circuit that includes a first capacitor, a first resistor and the switching path of a second semiconductor switch. The control electrode of the second semiconductor switch is connected to a tap on a first voltage divider to which a second capacitor is connected in parallel. The switching path of a third semiconductor switch is connected parallel to the control path of the second semiconductor switch. The third semiconductor switch is cut off in response to a control current supplied by a threshold value circuit when the supply voltage is below a threshold value.
REFERENCES:
patent: 3935511 (1976-01-01), Boulanger et al.
patent: 4396882 (1983-08-01), Kellenbenz
patent: 4744369 (1988-05-01), Kroll
Franzblau Bernard
Stephan Steven L.
Todd Voeltz Emanuel
U.S. Philips Corporation
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