Method of optimizing the efficiency of a high frequency zero voltage switching resonant power inverter for extended line and load range
First Claim
1. A method of optimizing efficiency of a high frequency zero voltage switching resonant converter having a power switching device operating into an effective load comprising an inductive reactive component;
- comprising the steps of;
utilizing a non-linear capacitance shunting the power switching device to reduce overall power dissipation by;
determining a switching loss characteristic of the power switch;
determining a conduction loss characteristic of the high frequency converter circuit including conduction loss in the power switch;
determining a set of component values defining an operating point for the high frequency converter that minimizes a sum of combined losses related to switching loss conduction loss and switching the power switching device at a frequency to achieve a high overall operating efficiency for the converter.
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Abstract
A power inverter efficiency is optimized at high frequency in a fully resonant inverter operating with a range of load impedance that takes into consideration switching loss and conducting loss as a combined overall effect. Within this range of load impedance the inverter is constrained to operate with switching loss which is generally considered unacceptable in a conventional high frequency high efficiency power inverter, but the overall combined high efficiency of the disclosed power inverter has a wider range of load impedances than has been previously achieved in such a resonant power inverter. Non-linear capacitance across switching the device is positively utilized in achieving this goal.
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Citations
5 Claims
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1. A method of optimizing efficiency of a high frequency zero voltage switching resonant converter having a power switching device operating into an effective load comprising an inductive reactive component;
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comprising the steps of; utilizing a non-linear capacitance shunting the power switching device to reduce overall power dissipation by; determining a switching loss characteristic of the power switch; determining a conduction loss characteristic of the high frequency converter circuit including conduction loss in the power switch; determining a set of component values defining an operating point for the high frequency converter that minimizes a sum of combined losses related to switching loss conduction loss and switching the power switching device at a frequency to achieve a high overall operating efficiency for the converter. - View Dependent Claims (2, 3)
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4. A method of enhancing overall efficiency of a high frequency fully resonant power converter in which a power switching device is operated into a series reactive load having an inductive impedance;
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comprising the steps of; utilizing a non linear capacitance with a capacitance characteristic in which capacitance increases as voltage decreases and which is connected in shunt with the power switch and is operative for shaping a voltage waveform across the power switch with a sharply defined peak region bounded by a gradual ascent and gradual descent in shape of the waveform and thereby broadening an impedance range into which the power switch can operate without incurring excessive switching losses; determining an overall loss profile curve for the power converter by combining switching loss and conduction loss characteristics for the power converter; and determining component values for the power converter that define an operating point of the power converter on the overall loss profile curve to minimize a sum of losses due to switching loss and conduction loss. - View Dependent Claims (5)
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Specification