Zero voltage switching
First Claim
1. A method comprising:
- charging, through a first switch, a capacitor during a first switching cycle when the first switch is closed at a first time;
discharging the capacitor to an output terminal through an inductor connected between a first node and the output terminal when the first switch is open; and
charging, through a second switch, the capacitor during a second switching cycle when the second switch is closed at a second time.
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Abstract
A method for providing non-resonant zero-voltage switching in a switching power converter. The switching power converter converts power from input power to output power during multiple periodic switching cycles. The switching power converter includes a main switch and an auxiliary capacitor adapted for connecting to the main switch, and an inductor connectible to the auxiliary capacitor. When the main switch is on, a previously charged (or previously discharged) auxiliary capacitor is connected to the main switch with auxiliary switches. The main switch is switched off with zero voltage while discharging non-resonantly (charging) the auxiliary capacitor by providing a current path to the inductor. The auxiliary capacitor is disconnected from the main switch. The voltage of the auxiliary capacitor is charged and discharged alternatively during subsequent switching cycles. The voltage of the auxiliary capacitor stays substantially the same until the subsequent turn off of the main switch during the next switching cycle with substantially no energy loss in the auxiliary capacitor.
1150 Citations
20 Claims
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1. A method comprising:
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charging, through a first switch, a capacitor during a first switching cycle when the first switch is closed at a first time; discharging the capacitor to an output terminal through an inductor connected between a first node and the output terminal when the first switch is open; and charging, through a second switch, the capacitor during a second switching cycle when the second switch is closed at a second time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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charging a capacitor through a first switch of a plurality of main switches; diverting current from an inductor to the capacitor through at least one bidirectional switch of a plurality of bidirectional switches while the first switch is off; inverting a charge on the capacitor; and charging the capacitor across through a second switch of the plurality of main switches. - View Dependent Claims (12, 13, 14, 15)
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16. A method comprising:
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connecting a first terminal of a capacitor to a first voltage source via a first main switch of a plurality of main switches and a first bidirectional switch of a plurality of bidirectional switches; connecting a second terminal of a capacitor to a second voltage source via a second main switch of the plurality of main switches and a second bidirectional switch of the plurality of bidirectional switches; disconnecting the first and second terminals from the first and second voltage sources by turning the first and second main switches off; diverting current from a first inductor to the first terminal via the first bidirectional switch; and diverting current from a second inductor to the second terminal via the second bidirectional switch. - View Dependent Claims (17, 18, 19, 20)
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Specification