POWER SUPPLY DEVICE

• US 20140372780A1
• Filed: 06/10/2014
• Published: 12/18/2014
• Est. Priority Date: 06/12/2013
• Status: Active Grant

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Central Japan Railway Company, Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: TAMATE, Michio, MARUYAMA, Koji, NISHIJIMA, Tomotaka, MURAI, Toshiaki, HAGIWARA, Yoshiyasu, SAWADA, Tadashi, TOBIKAWA, Masayuki, SAGA, Ayako
• Granted Patent: US 9,632,564 B2
• Time in Patent Office: Days
• US Class Current: 713/323
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 7/219 in a bridge configuration
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

In a power supply device, the bridge circuit is configured by connecting, in parallel, a plurality of series circuits of an inverse-parallel connection circuit of a semiconductor switch and a diode. A control unit controls switching of a semiconductor switch so that a voltage v between AC terminals becomes zero voltage in equal periods α before and after a center point shifted from one zero crossing point in one cycle of the input current by a compensation period (angle) β calculated from a voltage applied to a resonance circuit constituted by the power receiving coil and a resonance capacitor C_r and an induced voltage of the power receiving coil, and becomes a positive-negative voltage whose peak value is the voltage V_o between DC terminals in other periods.

Claims

1. 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 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.