Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se
Reexamination Certificate
2011-04-19
2011-04-19
Dole, Timothy J (Department: 2858)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
C323S265000, C323S271000, C323S282000, C323S319000
Reexamination Certificate
active
07928719
ABSTRACT:
A zero current detector for a DC-DC converter includes a first transistor having a drain, a gate, and a source for sensing the voltage of a first terminal of a power transistor; a second transistor having a drain, a gate, and a source for sensing the voltage of a second terminal of a power transistor; and a third transistor having a coupled gate and drain for receiving a reference current that is coupled to the gates of the first and second transistors and a source coupled to the source of the first transistor, wherein an output signal is provided by the drains of the first and second transistors. A load is coupled to the drains of the first and second transistors. The zero current detector also includes a fourth transistor having a current path coupled between the source of the second transistor and the second terminal of the power transistor and a gate for receiving a control signal.
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Jia Ligang
Zhang Haibo
Baldridge Benjamin M
Dole Timothy J
Jorgenson Lisa K.
Kubida William J.
Shenzhen STS Microelectronics Co. Ltd.
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