Wireless power transfer device and wireless power transfer system
DC CAFCFirst Claim
1. A transmitter for generating a wireless power transmitted to a receiver, the transmitter comprising:
- a control part for generating first to fourth AC power control signals; and
a power conversion part for generating an AC power including a positive polarity output voltage and a negative polarity output voltage in response to the first to fourth AC power control signals, wherein the power conversion part includes;
a first switching element connected between a first node and a second node and controlled in response to the first AC power control signal;
a second switching element connected between the second node and a ground and controlled in response to the second AC power control signal;
a third switching element connected between the first node and a third node and controlled in response to the third AC power control signal; and
a fourth switching element connected between the third node and the ground and controlled in response to the fourth AC power control signal,wherein when the first and fourth switching elements are turned on in response to the first and fourth AC power control signals, the positive polarity output voltage is generated, and when the second and third switching elements are turned on in response to the second and third AC power control signals, the negative polarity output voltage is generated,wherein a duty ratio of the positive polarity output voltage is determined by a falling time of the fourth AC power control signal, andwherein a duty ratio of the negative polarity output voltage is determined by a falling time of the third AC power control signal.
3 Assignments
Litigations
4 Petitions
Accused Products
Abstract
A wireless power transfer system according to an embodiment of the present invention is a wireless power transfer system having a receiving part for receiving power from a transmitting part, wherein the transmitting part comprises: a power conversion part comprising a full bridge inverter; and a control part for controlling the power conversion part using a pulse width modulation (PWM) control signal, the duty ratio of the PWM control signal being determined by a duty ratio in which the ratio of the magnitude of harmonics to the magnitude of a fundamental frequency among frequency components of the output signal of the power conversion part is a minimum.
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Citations
8 Claims
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1. A transmitter for generating a wireless power transmitted to a receiver, the transmitter comprising:
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a control part for generating first to fourth AC power control signals; and a power conversion part for generating an AC power including a positive polarity output voltage and a negative polarity output voltage in response to the first to fourth AC power control signals, wherein the power conversion part includes; a first switching element connected between a first node and a second node and controlled in response to the first AC power control signal; a second switching element connected between the second node and a ground and controlled in response to the second AC power control signal; a third switching element connected between the first node and a third node and controlled in response to the third AC power control signal; and a fourth switching element connected between the third node and the ground and controlled in response to the fourth AC power control signal, wherein when the first and fourth switching elements are turned on in response to the first and fourth AC power control signals, the positive polarity output voltage is generated, and when the second and third switching elements are turned on in response to the second and third AC power control signals, the negative polarity output voltage is generated, wherein a duty ratio of the positive polarity output voltage is determined by a falling time of the fourth AC power control signal, and wherein a duty ratio of the negative polarity output voltage is determined by a falling time of the third AC power control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification