Power supply device

A power supply device comprising:

• a power receiving coil configured to exchange power by an external magnetic coupling;
• a bridge circuit in which one end of the power receiving coil is connected to one alternating-current (AC) terminal through a resonance capacitor configuring a resonance circuit with the power receiving coil, and another end of the power receiving coil is connected to another AC terminal;
• and
• a smoothing capacitor connected between direct-current (DC) terminals of the bridge circuit,
• wherein
• a load is connected to both ends of the smoothing capacitor;
• and
• the bridge circuit is comprised by connecting, in parallel, a plurality of series circuits of, a diode and an inverse-parallel connection circuit of a semiconductor switch and a diode,
• wherein the power supply device comprises:
• a current detecting unit configured to detect an input current flowing in the power receiving coil;
• a voltage detecting unit configured to detect a voltage between DC terminals of the bridge circuit;
• and
• a control unit configured to perform switching of the semiconductor switch,
• wherein
• the control unit performs switching of the semiconductor switch so that
• a voltage between AC terminals of the bridge circuit becomes
• zero voltage in equal periods before and after a center point shifted from one zero crossing point in one cycle of the input current by a compensation period calculated from a voltage applied to the resonance circuit and an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage between DC terminals in other periods.

A power supply device comprising:

• a power receiving coil configured to exchange power by an external magnetic coupling;
• a bridge circuit in which one end of the power receiving coil is connected to one alternating-current (AC) terminal through a resonance capacitor configuring a resonance circuit with the power receiving coil, and another end of the power receiving coil is connected to another AC terminal;
• and
• a smoothing capacitor connected between direct-current (DC) terminals of the bridge circuit,
• wherein
• a load is connected to both ends of the smoothing capacitor;
• and
• the bridge circuit comprises, at least for one phase, a switching arm series circuit in which two inverse-parallel connection circuits of a semiconductor switch and a diode are connected in series,
• wherein the power supply device comprises:
• a current detecting unit configured to detect an input current flowing in the power receiving coil;
• a voltage detecting unit configured to detect a voltage between DC terminals of the bridge circuit;
• and
• a control unit configured to perform switching of the semiconductor switch,
• wherein
• the control unit performs switching of the semiconductor switch so that
• a voltage between AC terminals of the bridge circuit becomes
• zero voltage in equal periods before and after a center point shifted from respective zero crossing points in one cycle of the input current by a compensation period calculated from a voltage applied to the resonance circuit and an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage between DC terminals in other periods.

A power supply device comprising:

• a power receiving coil configured to exchange power by an external magnetic coupling;
• a bridge circuit in which one end of the power receiving coil is connected to one alternating-current (AC) terminal through a resonance capacitor configuring a resonance circuit with the power receiving coil, and another end of the power receiving coil is connected to another AC terminal;
• and
• a smoothing capacitor connected between direct-current (DC) terminals of the bridge circuit,
• wherein
• a load is connected to both ends of the smoothing capacitor;
• and
• the bridge circuit is comprised by connecting, in parallel, a plurality of series circuits of, a diode and an inverse-parallel connection circuit of a semiconductor switch and a diode,
• wherein the power supply device comprises:
• a current detecting unit configured to detect an input current flowing in the power receiving coil;
• a voltage detecting unit configured to detect a voltage between DC terminals of the bridge circuit;
• and
• a control unit configured to perform switching of the semiconductor switch,
• wherein
• the control unit performs switching of the semiconductor switch so that
• a voltage between AC terminals of the bridge circuit becomes
• zero voltage in equal periods before and after a center point shifted from respective zero crossing points in one cycle of the input current by a compensation period calculated from a voltage applied to the resonance circuit and an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage between DC terminals in other periods.

A power supply device comprising:

• a power receiving coil configured to exchange power by an external magnetic coupling;
• a bridge circuit in which one end of the power receiving coil is connected to one alternating-current (AC) terminal through a resonance capacitor configuring a resonance circuit with the power receiving coil, and another end of the power receiving coil is connected to another AC terminal;
• and
• a smoothing capacitor connected between direct-current (DC) terminals of the bridge circuit,
• wherein
• a load is connected to both ends of the smoothing capacitor;
• and
• the bridge circuit includes, at least for one phase, a switching arm series circuit in which two inverse-parallel connection circuits of a semiconductor switch and a diode are connected in series,
• wherein the power supply device comprises:
• a current detecting unit configured to detect an input current flowing in the power receiving coil;
• a voltage detecting unit configured to detect a voltage between DC terminals of the bridge circuit;
• and
• a control unit configured to perform switching of the semiconductor switch,
• wherein
• the control unit performs switching of the semiconductor switch so that
• a voltage between AC terminals of the bridge circuit becomes
• a positive-negative voltage whose peak value is the voltage between DC terminals in equal periods before and after a center point shifted from respective zero crossing points in one cycle of the input current by a compensation period calculated from a voltage applied to the resonance circuit and an induced voltage of the power receiving coil, and becomes zero voltage in other periods.

A power supply device comprising:

• a power receiving coil configured to exchange power by an external magnetic coupling;
• a bridge circuit in which one end of the power receiving coil is connected to one alternating-current (AC) terminal through a resonance capacitor configuring a resonance circuit with the power receiving coil, and another end of the power receiving coil is connected to another AC terminal;
• and
• a smoothing capacitor connected between direct-current (DC) terminals of the bridge circuit,
• wherein
• a load is connected to both ends of the smoothing capacitor;
• and
• the bridge circuit is comprised by connecting, in parallel, a plurality of series circuits of, a diode and an inverse-parallel connection circuit of a semiconductor switch and a diode,
• wherein the power supply device comprises:
• a current detecting unit configured to detect an input current flowing in the power receiving coil;
• a voltage detecting unit configured to detect a voltage between DC terminals of the bridge circuit;
• and
• a control unit configured to perform switching of the semiconductor switch,
• wherein
• the control unit performs switching of the semiconductor switch so that
• a voltage between AC terminals of the bridge circuit becomes
• a positive-negative voltage whose peak value is the voltage between DC terminals in equal periods before and after a center point shifted from respective zero crossing points in one cycle of the input current by a compensation period calculated from a voltage applied to the resonance circuit and an induced voltage of the power receiving coil, and becomes zero voltage in other periods.