Zero voltage switching
First Claim
1. A method comprising:
- transferring energy from an input through a first switch to an inductor thereby storing the energy on the inductor during first phases of respective periodic switching cycles of a power converter;
transferring the energy stored on the inductor through a second switch to an output during second phases of the respective periodic switching cycles;
zero volt switching off the first switch at a beginning of a transition from the first shale to the second phase of each respective periodic switching cycle;
zero volt switching on the second switch at an end of the transition from the first phase to the second phase of each respective periodic switching cycle; and
discharging or charging an auxiliary capacitor via a current path through the inductor while the first and second switches are off during the transition from the first phase to the second phase of each respective periodic switching cycle.
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Accused Products
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.
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Citations
19 Claims
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1. A method comprising:
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transferring energy from an input through a first switch to an inductor thereby storing the energy on the inductor during first phases of respective periodic switching cycles of a power converter; transferring the energy stored on the inductor through a second switch to an output during second phases of the respective periodic switching cycles; zero volt switching off the first switch at a beginning of a transition from the first shale to the second phase of each respective periodic switching cycle; zero volt switching on the second switch at an end of the transition from the first phase to the second phase of each respective periodic switching cycle; and discharging or charging an auxiliary capacitor via a current path through the inductor while the first and second switches are off during the transition from the first phase to the second phase of each respective periodic switching cycle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A switching converter comprising:
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first and second switches, an auxiliary capacitor circuit, an inductor, an input, and an output;
wherein;the first and second switches are connected to a first node of the inductor; said first switch is configured to transfer energy to the inductor from the input during first phases of respective periodic switching cycles; the second switch is configured to transfer the energy from the inductor to the output during second phases of the respective periodic switching cycles; the auxiliary capacitor circuit includes a capacitor and at least one auxiliary switch that closes a current path through the capacitor and the inductor; and the auxiliary capacitor circuit is configured to change a voltage at the first node such that the first and second switches are zero voltage switched at different times during transitions between the first and second phases. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A switching converter comprising:
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an input;
an output;
an inductor;
first and second switches connected to a node of the inductor; and
an auxiliary capacitor;
wherein the switching converter is configured to;during first phases of respective periodic switching cycles, transfer energy from the input through the first switch in an on state to the inductor thereby storing the energy on the inductor, and isolate the inductor from the output through the second switch in an off state; during respective second phases of the respective periodic switching cycles, transferring the stored energy from the inductor through the second switch in an on state to the output, and isolate the inductor from the input through the first switch in an off state; zero volt switch off the first switch at a beginning of a transition from the first phase to the second phase of each respective periodic switching cycle; zero volt switch on the second switch at an end of the transition from the first phase to the second phase of each respective periodic switching cycle; and discharge or charge the auxiliary capacitor via a current path through the inductor while the first and second switches are off during the transition from the first phase to the second phase of each respective periodic switching cycle. - View Dependent Claims (17, 18, 19)
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Specification