A circuit and method for controlling output voltage

Abstract

The invention provides a circuit and a method for controlling an output voltage. The circuit comprises one or more resonant capacitors, one or more switch tubes and a receiving resonance coil, wherein the one or more resonant capacitors form an equivalent resonant capacitor; the plurality of resonant capacitors are connected in a parallel manner; each resonant capacitor is connected with one switch tube in series; when one resonant capacitor is provided, the resonant capacitor is connected with the switch tube in series and then connected with the receiving resonance coil in parallel; and when the plurality of plurality of resonant capacitors are provided, each resonant capacitor is connected with the corresponding switch tube in series and then connected with the receiving resonance coil in parallel, or one side, which is not connected with the corresponding switch tube, of each resonant capacitor is connected with the receiving resonance coil in series. Through controlling on or off of the switch tubes, the resonance degree of the receiving resonance coil and the one or more resonant capacitors is changed; a voltage value of the output voltage can be controlled; and the problem that a serious heating phenomenon is generated or even a terminal electrical appliance is burnt out since the output voltage exceeds a withstand voltage range of the terminal electrical appliance is solved.

Description

technical field [0001] The present invention relates to the field of wireless power supply, and more specifically, relates to a circuit and method for controlling output voltage. Background technique [0002] Magnetic resonance wireless power supply is realized by coupling a transformer without a magnetic core in the same magnetic field. The transmitting coil is equivalent to the primary of the transformer, and the receiving coil is equivalent to the secondary of the transformer. There is a certain distance between the primary and the secondary. The medium is air or vacuum. The receiving resonant ring is the receiver of wireless power supply, and its performance affects various parameters of the receiving circuit, such as voltage, current, ripple, thermal stability, etc. [0003] In a traditional transformer, the coupled voltage is proportional to the number of turns of the coil, and the coupled current is inversely proportional to the number of turns of the coil. However,...

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Problems solved by technology

[0004] In view of this, the present invention provides a circuit and method for controlling the output voltage, so as to solve the problem that the output voltage exceeds the withstand voltage range of the terminal appliance, the heating phenomenon is serious, and even the terminal appliance will be burned.

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