Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2010-05-01
2011-12-13
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S018000, C363S021070, C363S021090, C363S021120
Reexamination Certificate
active
08077487
ABSTRACT:
In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly sampled after each pulse. The samples are used to regulate the power supply output voltage (VOUT). Other primary current pulses, however, are of a smaller peak amplitude. These pulses are not used for VOUT regulation, but rather are used to determine whether the VOUT has dropped. In a second aspect, a transient current detector circuit within the PSR controller integrated circuit detects whether an optocoupler current has dropped in a predetermined way. If the TRS current detector detects that the optocoupler current has dropped, then the power supply stops operating in a sleep mode and is made to operate in another higher power operating mode in which the power supply switches.
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Active-Semi, Inc.
Berhane Adolf
Imperium Patent Works
Tran Nguyen
Wallace Darien K.
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