Power supply device

• US 9,608,539 B2
• Filed: 03/07/2014
• Issued: 03/28/2017
• Est. Priority Date: 03/29/2013
• 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: Ichinose, Ayako, Tamate, Michio, Maruyama, Koji, Nishijima, Tomotaka
• Primary Examiner(s): Gannon, Levi
• Application Number:
  US14/200,790
• Publication Number:
  US 20140292092A1
• Time in Patent Office: 1,117 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 such that a plurality of series circuits of two inverse parallel connection circuits of a semiconductor switch and a diode are connected in parallel. The power supply device includes a control unit configured to control the semiconductor switch such that a voltage between AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a positive-negative voltage in which the output voltage is a peak current value during other time periods. Consequently, a power factor of the power receiving circuit is improved and a loss of an entire device is inhibited, and a size and a cost of the entire device may be reduced.

Claims

1. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of switching arm series circuits in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods.

2. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of switching arm series circuits in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a positive voltage or a negative voltage in which the output voltage is a peak value only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a zero voltage during a time period other than the prescribed time periods.

3. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of switching arm series circuits in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods.

14. The power supply device according to claim 3, wherein

the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, makes an on-period of each semiconductor switch partially overlap so as to include the one zero crossing point, and switches each semiconductor switch.

16. The power supply device according to claim 3, wherein

the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, switches each semiconductor switch so as to turn on each semiconductor switch simultaneously during a prescribed time period so as to include the one zero crossing point.

4. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a switching arm series circuit in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series and a diode series circuit in which two diodes are connected in series are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods.

5. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a switching arm series circuit in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series and a diode series circuit in which two diodes are connected in series are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a positive voltage or a negative voltage in which the output voltage is a peak value only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a zero voltage during a time period other than the prescribed time periods.

6. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a switching arm series circuit in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series and a diode series circuit in which two diodes are connected in series are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods.

7. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of DC circuits in which an inverse parallel connection circuit of a semiconductor switch and a diode is connected in series with a diode are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods.

8. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of DC circuits in which an inverse parallel connection circuit of a semiconductor switch and a diode is connected in series with a diode are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a positive voltage or a negative voltage in which the output voltage is a peak value only during a prescribed time period before and after two zero crossing points in one cycle of the input current and such that the voltage becomes a zero voltage during a time period other than the prescribed time periods.

9. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of DC circuits in which an inverse parallel connection circuit of a semiconductor switch and a diode is connected in series with and a diode are connected in parallel, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods.

10. The power supply device according to claim 9, wherein

the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, makes an on-period of each semiconductor switch partially overlap so as to include the one zero crossing point, and switches each semiconductor switch.

12. The power supply device according to claim 9, wherein

the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, switches each semiconductor switch so as to turn on each semiconductor switch simultaneously during a prescribed time period which includes the one zero crossing point.

11. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a switching arm series circuit in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series and a diode series circuit in which two diodes are connected in series are connected in parallel, and such that another diode is connected between one DC terminal of the bridge circuit and one end of the smoothing capacitor, the another diode having the same polarity as that of the diode series circuit, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods, the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, making an on-period of each semiconductor switch partially overlap so as to include the one zero crossing point, and switching each semiconductor switch.

13. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a switching arm series circuit in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series and a diode series circuit in which two diodes are connected in series are connected in parallel, and such that another diode is connected between one DC terminal of the bridge circuit and one end of the smoothing capacitor, the another diode having the same polarity as that of the diode series circuit, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods, the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, switching each semiconductor switch so as to turn on each semiconductor switch simultaneously during a prescribed time period which includes the one zero crossing point.

15. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of switching arm series circuits in which two inverse parallel connection circuits of a semiconductor switch and diode are connected in series are connected in parallel and such that another diode is connected between one DC terminal of the bridge circuit and one end of the smoothing capacitor, the another diode having the same polarity as that of the diode series circuit in the switching arm series circuit, wherein the power supply device includes;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods, the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, making an on-period of each semiconductor switch partially overlap so as to include the one zero crossing point, and switching each semiconductor switch.

17. A power supply device comprising:

a coil configured to exchange power by an external magnetic coupling;

a bridge circuit in which one end of the coil is connected to one alternate current (AC) terminal through a resonance capacitor and another end of the coil is connected to another AC terminal; and

a smoothing capacitor configured to be connected between direct current (DC) terminals of the bridge circuit, a load being connected at both ends of the smoothing capacitor, and the bridge circuit being configured such that a plurality of switching arm series circuits in which two inverse parallel connection circuits of a semiconductor switch and a diode are connected in series are connected in parallel and such that another diode is connected between one DC terminal of the bridge circuit and one end of the smoothing capacitor, the another diode having the same polarity as that of the diode series circuit in the switching arm series circuit, wherein the power supply device comprises;

a current detection unit configured to detect a current which flows through the coil as an input current;

a voltage detection unit configured to detect a voltage between the DC terminals as an output voltage; and

a control unit configured to switch the semiconductor switch at a constant cycle such that a voltage between the AC terminals of the bridge circuit becomes a zero voltage only during a prescribed time period before and after one of two zero crossing points in one cycle of the input current and such that the voltage becomes a positive voltage or a negative voltage in which the output voltage is a peak value during a time period other than the prescribed time periods, the control unit, when a detection error exists between the one zero crossing point and an original zero crossing point, switching each semiconductor switch so as to turn on each semiconductor switch simultaneously during a prescribed time period which includes the one zero crossing point.