Shorting period control in inductive power transfer systems
First Claim
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1. A power supply for an inductive power transfer (IPT) system, the power supply comprising:
- a. a current-fed push-pull resonant converter comprising a parallel-tuned resonant tank and a pair of switches enabling selective shorting of the resonant tank; and
b. a controller adapted to control a shorting period of the resonant converter by selectively operating the switches,wherein the controller is adapted to control the shorting period based solely upon slow feedback.
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Abstract
The present invention provides a power supply for an inductive power transfer (IPT) system, comprising a current-fed push-pull resonant converter comprising a parallel-tuned resonant tank and a pair of switches enabling selective shorting of the resonant tank; and a controller adapted to control a shorting period of the resonant converter by selectively operating the switches. Methods for controlling an IPT power supply are also disclosed. The power supply may be controlled to regulate the output of an IPT pick-up inductively coupled with the power supply in use, or to operate at a zero voltage switching (ZVS) frequency.
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Citations
19 Claims
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1. A power supply for an inductive power transfer (IPT) system, the power supply comprising:
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a. a current-fed push-pull resonant converter comprising a parallel-tuned resonant tank and a pair of switches enabling selective shorting of the resonant tank; and b. a controller adapted to control a shorting period of the resonant converter by selectively operating the switches, wherein the controller is adapted to control the shorting period based solely upon slow feedback. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling operation of an inductive power transfer (IPT) power supply in an IPT system, the power supply comprising a push-pull resonant converter and the method comprising the steps of:
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a. varying a switching frequency of the resonant converter to control a shorting period of the resonant converter; and b. limiting the switching frequency to a predetermined regulation range selected to maintain a non-negative impedance phase angle in the resonant converter, wherein the step of varying the switching frequency is based solely on slow feedback. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification