Power FET gate charge recovery
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Accused Products
Abstract
A circuit for recovering charge at the gate of an output transistor arranged to drive the output of a switching circuit such as a switching regulator or controller. A substantial portion of the charge for each switching cycle is recovered under a wide range of load conditions for the switching circuit, e.g., no load, partial load, or full load. Also, charge recovery operates effectively with a switching circuit that is arranged to switch in a synchronous or asynchronous manner. Additionally, if the output voltage of a switching circuit is 12 or more volts, the amount of charge that can be saved can be relatively substantial.
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Citations
40 Claims
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1-20. -20. (canceled)
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21. An apparatus comprising:
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a first transistor configured to provide an output voltage when the first transistor is turned on; a first switching transistor configured to turn the first transistor on; a second switching transistor configured to turn the first transistor off, wherein the first and second switching transistors are configured to be separately switched; a first charge-storage device; and a first switching device configured to conduct at least a first portion of a charge from the first transistor to the first charge-storage device when the first transistor transitions from on to off. - View Dependent Claims (22, 23, 24, 25)
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26. An apparatus comprising:
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a first transistor configured to provide an output voltage when the first transistor is turned on; a first charge-storage device; and a first switching device configured to conduct at least a first portion of a charge from the first transistor to the first charge-storage device when the first transistor transitions from on to off. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A method comprising:
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transitioning a first transistor from on to off, the first transistor configured to provide an output voltage when the first transistor is turned on; and during the transition of the first transistor from on to off, conducting at least a first portion of a charge from the first transistor to a first charge-storage device for storage. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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Specification