Wireless charging system
First Claim
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1. A wireless charging system comprising:
- a DC/AC converting unit providing an AC power, wherein the DC/AC converting unit comprises a DC power supply, a first inductor, a first field effect transistor (FET), a first capacitor, and a controller, a cathode of the DC power supply is grounded, an anode of the DC power supply is electrically coupled to a drain of the first FET through the first inductor, a gate of the first FET is grounded through the controller, a source of the first FET is grounded, a first terminal of the first capacitor is electrically coupled to a node between the first inductor and the first FET, and a second terminal of the first capacitor is grounded;
a transformer having a primary and secondary coil, the transformer obtaining the AC power from the DC/AC converting unit, and enlarging the AC power provided by the DC/AC converting unit according to a ratio of turns between the primary coil and the secondary coil;
a charging antenna obtaining the enlarged AC power from the transformer; and
a receiving antenna receiving power transmission wirelessly from the charging antenna.
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Abstract
A wireless charging system uses a transformer to adjust output voltage of the charging antenna to reduce the voltage in the resonant capacitor for a wireless charging coupling.
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Citations
9 Claims
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1. A wireless charging system comprising:
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a DC/AC converting unit providing an AC power, wherein the DC/AC converting unit comprises a DC power supply, a first inductor, a first field effect transistor (FET), a first capacitor, and a controller, a cathode of the DC power supply is grounded, an anode of the DC power supply is electrically coupled to a drain of the first FET through the first inductor, a gate of the first FET is grounded through the controller, a source of the first FET is grounded, a first terminal of the first capacitor is electrically coupled to a node between the first inductor and the first FET, and a second terminal of the first capacitor is grounded; a transformer having a primary and secondary coil, the transformer obtaining the AC power from the DC/AC converting unit, and enlarging the AC power provided by the DC/AC converting unit according to a ratio of turns between the primary coil and the secondary coil; a charging antenna obtaining the enlarged AC power from the transformer; and a receiving antenna receiving power transmission wirelessly from the charging antenna. - View Dependent Claims (2, 3, 4, 5)
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6. An electronic device, comprising:
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a DC/AC converting unit providing an AC power, wherein the DC/AC converting unit comprises a DC power supply, a first inductor, a first field effect transistor (FET), a first capacitor, and a controller, a cathode of the DC power supply is grounded, an anode of the DC power supply is electrically coupled to a drain of the first FET through the first inductor, a gate of the first FET is grounded through the controller, a source of the first FET is grounded, a first terminal of the first capacitor is electrically coupled to a node between the first inductor and the first FET, a second terminal of the first capacitor is grounded; a transformer having a primary and secondary coil, the transformer obtaining the AC power from the DC/AC converting unit, and enlarging the AC power provided by the DC/AC converting unit according to a ratio of turns between the primary coil and the secondary coil; a charging antenna obtaining the enlarged AC power from the transformer; a receiving antenna receiving power transmission wirelessly from the charging antenna, and a matching unit coupling to the charging antenna through the transformer to match impedance with the receiving antenna and adjust resonance frequencies for resonant coupling. - View Dependent Claims (7, 8, 9)
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Specification