Self-driven AC-DC synchronous rectifier for power applications
First Claim
1. A system, comprising:
- a set of power switches that receive an input power signal and rectify the input power signal to generate a rectified power signal as an output to facilitate synchronous rectification of the input power signal; and
a self-driven gate-drive (SDGD) subsystem that facilitates control of respective switching of respective power switches of the set of power switches, wherein the SDGD subsystem is powered by the rectified power signal or the input power signal, wherein the SDGD subsystem comprises a set of capacitors comprising a first capacitor and a second capacitor, wherein the SDGD subsystem controls respective charging of the first capacitor and the second capacitor to facilitate maintaining a first power switch of the set of power switches in a first switch state during a non-steady state phase of operation of the system until the SDGD subsystem is determined to be operating in steady state,wherein, at least during a portion of the non-steady state phase, to facilitate the maintaining of the first power switch in the first switch state during the non-steady state phase, the first capacitor and the second capacitor are charged, wherein the second capacitor is charged to a defined voltage level faster than the first capacitor until the second capacitor is charged to the defined voltage level, and wherein, after the second capacitor is charged to the defined voltage level, the first capacitor is charged to a voltage level that is higher than the defined voltage level to which the second capacitor has been charged.
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Accused Products
Abstract
Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.
22 Citations
20 Claims
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1. A system, comprising:
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a set of power switches that receive an input power signal and rectify the input power signal to generate a rectified power signal as an output to facilitate synchronous rectification of the input power signal; and a self-driven gate-drive (SDGD) subsystem that facilitates control of respective switching of respective power switches of the set of power switches, wherein the SDGD subsystem is powered by the rectified power signal or the input power signal, wherein the SDGD subsystem comprises a set of capacitors comprising a first capacitor and a second capacitor, wherein the SDGD subsystem controls respective charging of the first capacitor and the second capacitor to facilitate maintaining a first power switch of the set of power switches in a first switch state during a non-steady state phase of operation of the system until the SDGD subsystem is determined to be operating in steady state, wherein, at least during a portion of the non-steady state phase, to facilitate the maintaining of the first power switch in the first switch state during the non-steady state phase, the first capacitor and the second capacitor are charged, wherein the second capacitor is charged to a defined voltage level faster than the first capacitor until the second capacitor is charged to the defined voltage level, and wherein, after the second capacitor is charged to the defined voltage level, the first capacitor is charged to a voltage level that is higher than the defined voltage level to which the second capacitor has been charged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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generating, by an apparatus, a rectified power signal in response to an input power signal received by a set of power switches to facilitate a synchronous rectification of the input power signal, wherein at least a portion of the rectified power signal is supplied to a self-driven gate-drive (SDGD) subsystem associated with the set of power switches to facilitate controlling respective switching of respective power switches of the set of power switches, and wherein the SDGD subsystem comprises a set of capacitors comprising a first capacitor and a second capacitor; and controlling respective charging of the first capacitor and the second capacitor to facilitate maintaining a first power switch of the set of power switches in, or switching the first power switch to, a first switch state during a non-steady state phase of operation of the SDGD subsystem until the SDGD subsystem is determined to be operating in a steady state, wherein, at least during a portion of the non-steady state phase, to facilitate the maintaining of the first power switch in, or switching the first power switch to, the first switch state during the non-steady state phase, the first capacitor and the second capacitor are respectively charged to have the second capacitor charged to a defined voltage faster than the first capacitor until the second capacitor is charged to the defined voltage, and wherein, after the second capacitor is charged to the defined voltage, the first capacitor is charged to a first voltage that is higher than the defined voltage to which the second capacitor has been charged. - View Dependent Claims (14, 15, 16, 17)
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18. A device, comprising:
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a set of power switches configured to receive an input voltage signal and rectify the input voltage signal to generate a rectified voltage signal as an output; and a self-driven gate-drive (SDGD) subsystem configured to control respective switching of respective power switches of the set of power switches, wherein the SDGD subsystem is configured to receive at least a portion of the rectified voltage signal, wherein the SDGD subsystem comprises a set of capacitor components comprising a first capacitor component and a second capacitor component, and wherein the SDGD subsystem is configured to control respective charging of the first capacitor component and the second capacitor component to facilitate maintaining a first power switch of the set of power switches in a first switch state during initiation of operation of the SDGD subsystem until the SDGD subsystem is operating in a steady state, wherein, at least during a portion of the initiation of the operation of the SDGD subsystem prior to the SDGD subsystem operating in the steady state, to facilitate the maintaining of the first power switch in the first switch state during the initiation of the operation of the SDGD subsystem until the SDGD subsystem is operating in the steady state, the first capacitor component and the second capacitor component are respectively charged to have the second capacitor component be charged to a defined voltage level quicker than the first capacitor component until the second capacitor component is charged to the defined voltage level, and wherein, after the second capacitor component is charged to the defined voltage level, the first capacitor component is charged to a voltage level that is higher than the defined voltage level to which the second capacitor component has been charged. - View Dependent Claims (19, 20)
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Specification