Power transmission control device, power transmitting device, electronic instrument, and non-contact power transmission system
First Claim
1. A power transmission control device that controls power transmission of a power transmitting device of a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmitting device to a power receiving device by electromagnetically coupling a primary coil and a secondary coil and supplying the power to a load of the power receiving device, the power transmission control device comprising:
- a driver control circuit that controls a power transmitting driver that drives the primary coil;
a load state detection circuit that detects a power-receiving-side load state; and
a control circuit that controls the driver control circuit,the control circuit performing a foreign object detection process based on load state detection information from the load state detection circuit after receiving ID authentication information from the power receiving device, and starting normal power transmission to the power receiving device after performing the foreign object detection process, andthe control circuit setting a drive frequency at a foreign object detection frequency when performing the foreign object detection process, the foreign object detection frequency being a frequency between the normal power transmission frequency and a coil resonance frequency.
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Accused Products
Abstract
A power transmission control device provided in a power transmitting device of a non-contact power transmission system includes a driver control circuit that controls a power transmitting driver that drives a primary coil, a load state detection circuit that detects a power-receiving-side load state, and a control circuit that controls the driver control circuit. The control circuit performs a foreign object detection process based on load state detection information from the load state detection circuit after receiving ID authentication information from a power receiving device, and starts normal power transmission to the power receiving device after performing the foreign object detection process.
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Citations
18 Claims
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1. A power transmission control device that controls power transmission of a power transmitting device of a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmitting device to a power receiving device by electromagnetically coupling a primary coil and a secondary coil and supplying the power to a load of the power receiving device, the power transmission control device comprising:
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a driver control circuit that controls a power transmitting driver that drives the primary coil; a load state detection circuit that detects a power-receiving-side load state; and a control circuit that controls the driver control circuit, the control circuit performing a foreign object detection process based on load state detection information from the load state detection circuit after receiving ID authentication information from the power receiving device, and starting normal power transmission to the power receiving device after performing the foreign object detection process, and the control circuit setting a drive frequency at a foreign object detection frequency when performing the foreign object detection process, the foreign object detection frequency being a frequency between the normal power transmission frequency and a coil resonance frequency. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14)
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6. A power transmission control device that controls power transmission of a power transmitting device of a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmitting device to a power receiving device by electromagnetically coupling a primary coil and a secondary coil and supplying the power to a load of the power receiving device, the power transmission control device comprising:
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a driver control circuit that controls a power transmitting driver that drives the primary coil; a load state detection circuit that detects a power-receiving-side load state; and a control circuit that controls the driver control circuit, the control circuit performing a foreign object detection process based on load state detection information from the load state detection circuit after receiving ID authentication information from the power receiving device, and starting normal power transmission to the power receiving device after performing the foreign object detection process, the control circuit performing a primary foreign object detection process by comparing the load state detection information from the load state detection circuit with a first threshold value for a load-state-detection, the primary foreign object detection being the foreign object detection before starting the normal power transmission, and the control circuit performing a secondary foreign object detection process by comparing the load state detection information from the load state detection information with a second threshold value for the load-state-detection, the second threshold value being set on a load-connected side value with respect to the first threshold value, the second foreign object detection being the foreign object detection after starting the normal power transmission. - View Dependent Claims (17, 18)
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15. A non-contact power transmission system comprising a power transmitting device and a power receiving device, the non-contact power transmission system transmitting power from the power transmitting device to the power receiving device by electromagnetically coupling a primary coil and a secondary coil, and supplying the power to a load of the power receiving device,
the power receiving device including: -
a power receiving section that converts an induced voltage of the secondary coil into a direct-current voltage; and a load modulation section that variably changes a load corresponding to data transmitted to the power transmitting device from the power receiving device; and the power transmitting device including; a driver control circuit that controls a power transmitting driver that drives the primary coil; a load state detection circuit that detects a power-receiving-side load state; and a control circuit that controls the driver control circuit, the control circuit performing a foreign object detection process based on load state detection information from the load state detection circuit after receiving ID authentication information from the power receiving device, and starting normal power transmission to the power receiving device after performing the foreign object detection process, and the control circuit setting a drive frequency at a foreign object detection frequency when performing the foreign object detection process, the foreign object detection frequency being a frequency between the normal power transmission frequency and a coil resonance frequency.
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16. A non-contact power transmission system comprising a power transmitting device and a power receiving device, the non-contact power transmission system transmitting power from the power transmitting device to the power receiving device by electromagnetically coupling a primary coil and a secondary coil, and supplying the power to a load of the power receiving device,
the power receiving device including: -
a power receiving section that converts an induced voltage of the secondary coil into a direct-current voltage; and a load modulation section that variably changes a load corresponding to data transmitted to the power transmitting device from the power receiving device; and the power transmitting device including; a driver control circuit that controls a power transmitting driver that drives the primary coil; a load state detection circuit that detects a power-receiving-side load state; and a control circuit that controls the driver control circuit, the control circuit performing a foreign object detection process based on load state detection information from the load state detection circuit after receiving ID authentication information from the power receiving device, and starting normal power transmission to the power receiving device after performing the foreign object detection process, and the control circuit performing a primary foreign object detection process by comparing the load state detection information from the load state detection circuit with a first threshold value for a load-state-detection, the primary foreign object detection being the foreign object detection before starting the normal power transmission, and the control circuit performing a secondary foreign object detection process by comparing the load state detection information from the load state detection information with a second threshold value for the load-state-detection, the second threshold value being set on a load-connected side value with respect to the first threshold value, the second foreign object detection being the foreign object detection after starting the normal power transmission.
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Specification