Electric power conversion systems – Current conversion – With starting arrangement
Reexamination Certificate
2009-04-09
2011-10-25
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
With starting arrangement
C363S018000, C363S020000, C363S021120, C363S056090
Reexamination Certificate
active
08045348
ABSTRACT:
A controller for a switching mode power supply includes two semiconductor chips. The first semiconductor chip has a high-voltage startup transistor coupled to a high voltage supply input terminal and configured to provide a charging current in a startup phase or protection mode of a switching mode power supply (SMPS) and to provide substantially no current in a normal operation phase of the SMPS. The second semiconductor chip has a control circuit for controlling the switching mode power supply. The second semiconductor chip also has first and second on-chip high-voltage resistors coupled to the high-voltage supply input terminal and the high-voltage startup transistor in the first semiconductor chip. The first and the second on-chip high-voltage resistors are configured to provide a voltage and a current related to a voltage at the high-voltage supply input terminal.
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Liu Xianfeng
Wang Yanping
Ying Zheng
Zhu Yajiang
BCD Semiconductor Manufacturing Limited
Berhane Adolf
Kilpatrick Townsend & Stockton LLP
Tran Nguyen
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