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 of 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 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 adjusting circuit that adjusts a waveform of an induced voltage signal of the primary coil and outputs a waveform adjusting signal;
a pulse width detection circuit that receives the waveform adjusting signal and the drive clock signal and detects pulse width information relating to the waveform adjusting signal; and
a control circuit that detects a change of secondary-side load based on the pulse width information that has been detected.
1 Assignment
0 Petitions
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 that specifies 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 adjusting circuit that outputs a waveform adjusting signal of an induced voltage signal of the primary coil, a pulse width detection circuit that receives the waveform adjusting signal and the drive clock signal and detects pulse width information relating to the waveform adjusting signal, and a control circuit that detects a change in secondary-side load based on the detected pulse width information.
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Citations
17 Claims
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1. A power transmission control device provided in a power transmission device of 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 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 adjusting circuit that adjusts a waveform of an induced voltage signal of the primary coil and outputs a waveform adjusting signal; a pulse width detection circuit that receives the waveform adjusting signal and the drive clock signal and detects pulse width information relating to the waveform adjusting signal; and a control circuit that detects a change of secondary-side load based on the pulse width information that has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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:
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a power reception section that converts an induced voltage in the secondary coil into a direct voltage; and a load modulation section that variably changes a load depending on transmission data when the power reception device transmits data to the power transmission device; 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 adjusting circuit that adjusts a waveform of an induced voltage signal of the primary coil and outputs a waveform adjusting signal; a pulse width detection circuit that receives the waveform adjusting signal and the drive clock signal and detects pulse width information relating to the waveform adjusting signal; and a control circuit that detects a change in secondary-side load based on the pulse width information that has been detected.
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14. A power transmission control device provided in a power transmission device of 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 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 adjusting circuit that adjusts a waveform of an induced voltage signal of the primary coil and outputs a waveform adjusting signal; a pulse width detection circuit that receives the waveform adjusting signal and the drive clock signal and detects pulse width information of the waveform adjusting signal; and a control circuit that controls the power transmission control device based on the pulse width information that has been detected. - View Dependent Claims (15, 16, 17)
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Specification