Power transmission control device, power transmission device, non-contact power transmission system, and electronic instrument

A non-contact power transmission system comprising a power transmission device and a power reception device, when a switch provided in a power-transmission-side instrument has been turned ON, the non-contact power transmission system performing non-contact power transmission from the power transmission device to the power reception device through a primary coil and a secondary coil that are electromagnetically coupled,

• the power transmission device including a power-transmission-side control circuit that controls power transmission to the power reception device based on an induced voltage in the primary coil;
• the power reception device including:
• a power supply control section that controls power supply to a power-supply-target load;
• and
• a power reception control device that includes a power-reception-side control circuit that controls the power reception device;
• and
• the power-transmission-side control circuit of the power transmission device causing the power transmission device to perform temporary power transmission to the power reception device to enable ID authentication on the power reception device when the switch provided in the power-transmission-side instrument has been turned ON, performing ID authentication based on ID authentication information transmitted from the power reception device that has received the temporary power transmission, causing the power transmission device to perform normal power transmission to the power reception device after the conformity of the power reception device has been authenticated by the ID authentication, and causing the power transmission device to stop the temporary power transmission and return to an initial state that waits for the switch to be turned ON when the ID authentication information from the power reception device has not been received within a given period of time after the temporary power transmission has started, or the ID authentication has failed.

A non-contact power transmission system comprising a power transmission device and a power reception device, when a switch provided in a power-transmission-side instrument has been turned ON, the non-contact power transmission system performing non-contact power transmission from the power transmission device to the power reception device through a primary coil and a secondary coil that are electromagnetically coupled,

• the power transmission device including a power-transmission-side control circuit that controls power transmission to the power reception device based on an induced voltage in the primary coil;
• the power reception device including:
• a load modulation section that modulates a load of the power reception device;
• a power supply control section that controls power supply to a power-supply-target load;
• and
• a power reception control device that includes a full-charge detection section that detects whether or not the power-supply-target load has been fully charged, and a power-reception-side control circuit that controls the power reception device;
• the power-reception-side control circuit causing the power reception device to transmit ID authentication information to the power transmission device due to load modulation by the load modulation section when the power reception device has received the temporary power transmission from the power transmission device, causing the power supply control section to supply power to the power-supply-target load when the power reception device has received the normal power transmission from the power transmission device, causing the load modulation section to operate to intermittently change the load of the power reception device in order to detect a takeover state when power is supplied to the power-supply-target load, and transmitting a full-charge notification to the power transmission device due to load modulation by the load modulation section when the full-charge detection section has detected that the power-supply-target load has been fully charged;
• and
• the power-transmission-side control circuit causing the power transmission device to perform the temporary power transmission to the power reception device to enable ID authentication on the power reception device when the switch has been turned ON, performing ID authentication based on the ID authentication information transmitted from the power reception device that has received the temporary power transmission, causing the power transmission device to stop the temporary power transmission and return to an initial state that waits for the switch to be turned ON when the ID authentication information from the power reception device has not been received within a given period of time after the temporary power transmission has started, causing the power transmission device to stop the temporary power transmission and return to the initial state when the ID authentication has failed, causing the power transmission device to perform the normal power transmission to the power reception device after the conformity of the power reception device has been authenticated by the ID authentication, detecting the presence or absence of a foreign object during the normal power transmission based on a change in waveform of an induced voltage signal of the primary coil, detecting whether or not the takeover state has occurred by determining whether or not a signal based on the intermittent load modulation by the power reception device can be detected, and causing the power transmission device to stop the normal power transmission and return to the initial state when a foreign object or the takeover state has been detected or it has been detected that the power-supply-target load of the power reception device has been fully charged.