POWER TRANSMISSION CONTROL DEVICE, POWER TRANSMISSION DEVICE, ELECTRONIC INSTRUMENT, AND NON-CONTACT POWER TRANSMISSION SYSTEM
First Claim
1. A power transmission control device provided in a power transmission device included in a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmission device to a power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device, the power transmission control device comprising:
- a drive clock signal generation circuit that generates a drive clock signal that specifies a drive frequency of the primary coil;
a driver control circuit that generates and outputs a driver control signal based on the drive clock signal, and outputs the driver control signal to a transmission driver that drives the primary coil;
a waveform detection circuit that detects a change in waveform of an induced voltage signal of the primary coil; and
a control circuit that performs foreign object detection based on a detection result of the waveform detection circuit,the drive clock signal generation circuit outputting the drive clock signal set at a foreign object detection frequency during foreign object detection, the foreign object detection frequency being a frequency differing from a normal power transmission frequency.
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Accused Products
Abstract
A power transmission control device provided in a power transmission device of a non-contact power transmission system includes a drive clock signal generation circuit that generates a drive clock signal specifying a drive frequency of a primary coil, a driver control circuit that generates a driver control signal based on the drive clock signal, and outputs the driver control signal to a transmission driver, a waveform detection circuit that detects a change in waveform of an induced voltage signal of the primary coil, and a control circuit that performs foreign object detection based on a detection result of the waveform detection circuit. The drive clock signal generation circuit outputs the drive clock signal set at a foreign object detection frequency during foreign object detection, the foreign object detection frequency being a frequency differing from a normal power transmission frequency.
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Citations
16 Claims
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1. A power transmission control device provided in a power transmission device included in a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmission device to a power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device, the power transmission control device comprising:
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a drive clock signal generation circuit that generates a drive clock signal that specifies a drive frequency of the primary coil; a driver control circuit that generates and outputs a driver control signal based on the drive clock signal, and outputs the driver control signal to a transmission driver that drives the primary coil; a waveform detection circuit that detects a change in waveform of an induced voltage signal of the primary coil; and a control circuit that performs foreign object detection based on a detection result of the waveform detection circuit, the drive clock signal generation circuit outputting the drive clock signal set at a foreign object detection frequency during foreign object detection, the foreign object detection frequency being a frequency differing from a normal power transmission frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A non-contact power transmission system comprising a power transmission device and a power reception device, the non-contact power transmission system transmitting power from the power transmission device to the power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit the power to a load of the power reception device,
the power reception device including a power reception section that converts an induced voltage in the secondary coil into a direct-current voltage; - and
the power transmission device including; a drive clock signal generation circuit that generates a drive clock signal that specifies a drive frequency of the primary coil; a driver control circuit that generates a driver control signal based on the drive clock signal, and outputs the driver control signal to a transmission driver that drives the primary coil; a waveform detection circuit that detects a change in waveform of an induced voltage signal of the primary coil; and a control circuit that performs foreign object detection based on a detection result of the waveform detection circuit, the drive clock signal generation circuit outputting the drive clock signal set at a foreign object detection frequency during foreign object detection, the foreign object detection frequency being a frequency differing from a normal power transmission frequency.
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Specification