Voltage multiplication in a wireless receiver
First Claim
1. An apparatus configured as a wireless energy transfer receiver in an electronic device, the wireless energy receiver operable with a wireless energy transmitter for wireless energy transfer from the transmitter to the electronic device, comprising:
- an inductive coil configured to receive alternating current (AC) electric energy magnetically coupled into the inductive coil from the wireless energy transmitter;
an output circuit including an output capacitor;
a resonator circuit including the inductive coil and a resonator capacitor;
a synchronous rectification circuit coupled to the inductive coil and the resonator capacitor, and configured to convert the AC energy received at the inductive coil into DC energy supplied to the output circuit including the output capacitor and the electronic device; and
the synchronous rectification circuit including four diodes D1-D4 arranged as a diode bridge rectifier, and four transistor switches Q1-Q4 respectively connected across the diodes D1-D4, the transistor switches controlled such that the synchronous rectification circuit is operable in two modes;
a resonant multiplication mode in which transistor switches Q2 and Q4 are conducting, short circuiting respective diodes D2 and D4, and transistors Q1 and Q3 are non-conducting, such that (i) the resonator circuit operates as a resonant tank storing transferred wireless energy on the resonator capacitor, and (ii) DC energy is supplied to the electronic device from the output capacitor; and
a rectification mode in which the transistor switches Q1-Q4 are synchronously controlled such that the diode bridge rectifier supplies rectified energy from the resonator circuit to the output circuit.
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Accused Products
Abstract
A wireless energy transfer receiver includes an input configured to receive alternating current (AC) electric energy and an output configured to make available direct current (DC) electric energy. The receiver further includes a rectification component configured to convert the AC energy received at the input into DC energy available at the output, the DC energy made available as DC voltage; and a multiplication component configured to amplify a peak voltage of the AC energy received at the input, the DC voltage made available at the output correspondingly being higher than the peak voltage of the AC energy received at the input.
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Citations
6 Claims
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1. An apparatus configured as a wireless energy transfer receiver in an electronic device, the wireless energy receiver operable with a wireless energy transmitter for wireless energy transfer from the transmitter to the electronic device, comprising:
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an inductive coil configured to receive alternating current (AC) electric energy magnetically coupled into the inductive coil from the wireless energy transmitter; an output circuit including an output capacitor; a resonator circuit including the inductive coil and a resonator capacitor; a synchronous rectification circuit coupled to the inductive coil and the resonator capacitor, and configured to convert the AC energy received at the inductive coil into DC energy supplied to the output circuit including the output capacitor and the electronic device; and the synchronous rectification circuit including four diodes D1-D4 arranged as a diode bridge rectifier, and four transistor switches Q1-Q4 respectively connected across the diodes D1-D4, the transistor switches controlled such that the synchronous rectification circuit is operable in two modes; a resonant multiplication mode in which transistor switches Q2 and Q4 are conducting, short circuiting respective diodes D2 and D4, and transistors Q1 and Q3 are non-conducting, such that (i) the resonator circuit operates as a resonant tank storing transferred wireless energy on the resonator capacitor, and (ii) DC energy is supplied to the electronic device from the output capacitor; and a rectification mode in which the transistor switches Q1-Q4 are synchronously controlled such that the diode bridge rectifier supplies rectified energy from the resonator circuit to the output circuit. - View Dependent Claims (2, 3)
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4. A method employable for wireless energy transfer to an electronic device, using a wireless energy transmitter and a wireless energy receiver included in the electronic device, comprising:
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configuring the wireless energy receiver with a resonator and a synchronous bridge rectifier, the resonator including an inductive coil magnetically coupled to the wireless energy transmitter, and a resonator capacitor, together forming a resonant tank; the synchronous bridge rectifier including four diodes D1-D4 arranged as a diode bridge rectifier, and four transistor switches Q1-Q4 respectively connected across the diodes D1-D4; an output circuit including an output capacitor; and controlling the synchronous bridge rectifier (transistor switches Q1-Q4) to operate in two modes; a resonant multiplication mode in which transistor switches Q2 and Q4 are conducting, short circuiting respective diodes D2 and D4, and transistors Q1 and Q3 are non-conducting, such that (i) the resonator stores transferred wireless energy on the resonator capacitor, and (ii) DC energy is supplied to the electronic device from the output capacitor; and a rectification mode in which the transistor switches Q1-Q4 are controlled such that the diode bridge rectifier supplies rectified energy from the resonator to the output circuit. - View Dependent Claims (5, 6)
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Specification