Peak voltage detection in a differentially driven wireless resonant transmitter
First Claim
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1. A wireless power circuit comprising:
- (a) a series resonant circuit including a primary capacitor and an inductor coupled in series, the primary capacitor having first and second terminals and the inductor having first and second terminals, a first terminal of the inductor being coupled to a second terminal of the primary capacitor;
(b) a first half-bridge circuit having a terminal coupled to the first terminal of the capacitor;
(c) a second half-bridge circuit having a terminal coupled to the second terminal of the inductor;
(d) a summing circuit having a first summing terminal coupled to the first terminal of the inductor, a second summing terminal coupled to the second terminal of the inductor, and a center node terminal; and
(e) a peek-to-peek voltage detector having an input coupled to the center node terminal of the summing circuit and having a voltage detector output.
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Abstract
A wireless resonant power transmitter includes a first half-bridge and a second half-bridge adapted to be class D driven that are coupled to drive a series resonant circuit including a primary inductor (L) having a high side terminal and a low side terminal, and primary capacitor (C). A peak voltage sensor that includes a summing block is coupled across the high side terminal and the low side terminal of the primary L, and a peak-to-peak voltage detector is coupled to an output of the summing block to generate a DC voltage signal that is proportional to a peak-to-peak voltage across the primary C.
2 Citations
18 Claims
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1. A wireless power circuit comprising:
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(a) a series resonant circuit including a primary capacitor and an inductor coupled in series, the primary capacitor having first and second terminals and the inductor having first and second terminals, a first terminal of the inductor being coupled to a second terminal of the primary capacitor; (b) a first half-bridge circuit having a terminal coupled to the first terminal of the capacitor; (c) a second half-bridge circuit having a terminal coupled to the second terminal of the inductor; (d) a summing circuit having a first summing terminal coupled to the first terminal of the inductor, a second summing terminal coupled to the second terminal of the inductor, and a center node terminal; and (e) a peek-to-peek voltage detector having an input coupled to the center node terminal of the summing circuit and having a voltage detector output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process of peak-to-peak detection comprising:
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(a) applying voltage pulses to a serial coupled primary capacitor and inductor; (b) summing voltages from across the inductor to provide a summing output signal at a center node; and (c) processing the summing output signal to generate a DC voltage signal that is proportional to a peak-to-peak voltage across the primary capacitor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification