WIRELESS CHARGING CIRCUIT AND ABNORMAL STATE PROTECTION CIRCUIT THEREOF
First Claim
1. A wireless charging circuit, comprising:
- a power converter, receiving an input voltage, for outputting a pulse width modulation signal;
a resonant circuit, comprising an input terminal, a resonant terminal and a common voltage terminal, wherein the input terminal of the resonant circuit receives the pulse width modulation signal, and the common voltage terminal of the resonant circuit is coupled to a common voltage;
an abnormal state protection circuit, comprising;
a DC sampling circuit, coupled to the resonant terminal of the resonant circuit, for sampling a DC component of a voltage of the resonant terminal of the resonant circuit to obtain a DC voltage; and
a control circuit, coupled to the power converter and the DC sampling circuit, receiving the DC voltage,wherein the control circuit controls the power converter to reduce a current inputted to the resonant circuit when the DC voltage is greater than a threshold voltage.
1 Assignment
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Accused Products
Abstract
A wireless charging circuit and an abnormal state protection circuit thereof is provided in the present invention. The wireless charging circuit includes a power converter, a resonant circuit and an abnormal state protection circuit. The power converter receives an input voltage for outputting a PWM (pulse width modulation) signal. The input terminal of the resonant circuit receives the PWM signal. The common voltage terminal of the resonant circuit is coupled to a common voltage. The abnormal state protection circuit includes a DC sampling circuit and a control circuit. The DC sampling circuit is coupled to the resonant terminal of the resonant circuit for sampling the DC component of the voltage of the resonant terminal to obtain a DC voltage. The control circuit is coupled to the power converter and the DC sampling circuit for receiving the DC voltage. When the DC voltage is greater than a threshold voltage, the control circuit controls the power converter to reduce the current flowing through the resonant circuit.
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Citations
18 Claims
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1. A wireless charging circuit, comprising:
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a power converter, receiving an input voltage, for outputting a pulse width modulation signal; a resonant circuit, comprising an input terminal, a resonant terminal and a common voltage terminal, wherein the input terminal of the resonant circuit receives the pulse width modulation signal, and the common voltage terminal of the resonant circuit is coupled to a common voltage; an abnormal state protection circuit, comprising; a DC sampling circuit, coupled to the resonant terminal of the resonant circuit, for sampling a DC component of a voltage of the resonant terminal of the resonant circuit to obtain a DC voltage; and a control circuit, coupled to the power converter and the DC sampling circuit, receiving the DC voltage, wherein the control circuit controls the power converter to reduce a current inputted to the resonant circuit when the DC voltage is greater than a threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A abnormal state protection circuit, adapted for a wireless charging circuit, wherein the wireless charging circuit comprises a power converter and a resonant circuit, wherein the power converter receives an input voltage for output a pulse width modulation signal, wherein the resonant circuit comprises an input terminal, a resonant terminal and a common voltage terminal, wherein the input terminal receives the pulse width modulation signal, the common voltage terminal is coupled to a common voltage, wherein the abnormal state protection circuit comprises:
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a DC sampling circuit, coupled to the resonant terminal of the resonant circuit for sampling a DC component of a voltage of the resonant terminal of the resonant circuit to obtain a DC voltage; and a control circuit, coupled to the power converter and the DC sampling circuit, receiving the DC voltage, wherein the control circuit control the power converter to reduce a current inputted to the resonant circuit when the DC voltage is greater than a threshold voltage. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification