Non-contact power feeding device including power transmitter device with phase control circuit

A non-contact power feeding device comprising:

• a power transmitter device;
• and
• a power receiver device to which the power transmitter device transmits power in a non-contact manner, wherein
• the power transmitter device comprises
• a transmitter coil configured to supply power to the power receiver device,
• a power supply circuit comprising a plurality of switching elements connected between a DC power supply and the transmitter coil in a full-bridge configuration or a half-bridge configuration, the power supply circuit being configured to switch the plurality of switching elements to an on or off state at a switching frequency to convert DC power supplied from the DC power supply into AC power having the switching frequency and supply the AC power to the transmitter coil, and
• a phase control circuit comprising at least one LC series circuit connected to both ends of the transmitter coil, wherein a resonance frequency of each of the at least one LC series circuit is higher than the switching frequency and less than twice the switching frequency, and wherein
• each of the at least one LC series circuit of the phase control circuit comprises a coil, a first capacitor and a second capacitor connected in series with the coil and connected in parallel with each other, and a switching element connected in series with the second capacitor, the switching element being configured to connect the second capacitor to the coil in response to being switched to the on state and to separate the second capacitor from the coil in response to being switched to the off state, and
• the power transmitter device further comprises a control circuit configured to control the switching frequency at which the plurality of switching elements of the power supply circuit are switched to the on or off state and to switch the switching element of each of the at least one LC series circuit to the on or off state in accordance with the switching frequency of the AC power supplied from the power supply circuit to the transmitter coil while the non-contact power feeding device is in constant voltage output action.

A non-contact power feeding device comprising:

• a power transmitter device;
• and
• a power receiver device to which the power transmitter device transmits power in a non-contact manner, wherein
• the power transmitter device comprises
• a transmitter coil configured to supply power to the power receiver device,
• a power supply circuit comprising a plurality of switching elements connected between a DC power supply and the transmitter coil in a full-bridge configuration or a half-bridge configuration, the power supply circuit being configured to switch the plurality of switching elements to an on or off state at a switching frequency to convert DC power supplied from the DC power supply into AC power having the switching frequency and supply the AC power to the transmitter coil, and
• a phase control circuit comprising at least one LC series circuit connected to both ends of the transmitter coil, wherein a resonance frequency of each of the at least one LC series circuit is higher than the switching frequency and less than twice the switching frequency, and wherein
• each of the at least one LC series circuit of the phase control circuit comprises a switching element configured to connect the LC series circuit to the transmitter coil in response to being switched to the on state and to separate the LC series circuit from the transmitter coil in response to being switched to the off state, and
• the power transmitter device further comprises
• a control circuit configured to control the switching frequency at which the plurality of switching elements of the power supply circuit are switched to the on or off state and to switch the switching element of each of the at least one LC series circuit to the on or off state in accordance with the switching frequency of the AC power supplied from the power supply circuit to the transmitter coil or a voltage of the AC power while the non-contact power feeding device is in constant voltage output action.

A non-contact power feeding device comprising:

• a power transmitter device;
• and
• a power receiver device to which the power transmitter device transmits power in a non-contact manner, wherein
• the power transmitter device comprises
• a transmitter coil configured to supply power to the power receiver device,
• a power supply circuit comprising a plurality of switching elements connected between a DC power supply and the transmitter coil in a full-bridge configuration or a half-bridge configuration, the power supply circuit being configured to switch the plurality of switching elements to an on or off state at a switching frequency to convert DC power supplied from the DC power supply into AC power having the switching frequency and supply the AC power to the transmitter coil, and
• a phase control circuit comprising at least one LC series circuit connected to both ends of the transmitter coil, wherein a resonance frequency of each of the at least one LC series circuit is higher than the switching frequency and less than twice the switching frequency, and wherein the at least one LC series circuit comprises a first LC series circuit having a first end connected to a first end of the transmitter coil and having a second end grounded, and a second LC series circuit having a first end connected to a second end of the transmitter coil and having a second end grounded, and the first and second ends of the transmitter coil are not grounded.