发明名称 |
Power supply device with a resonant bridge circuit control unit |
摘要 |
In a power supply device, the bridge circuit including a plurality of switching arms which is an inverse-parallel circuit of a semiconductor switch and a diode. The power supply device includes a control unit. The control unit switches the semiconductor switch such that a voltage v between AC terminals becomes a positive-negative voltage whose peak value is the voltage Vo between the DC terminals only during prescribed time periods before and after a point that has deviated from each zero crossing point ZCP of a current i by a prescribed compensation period φ and such that the voltage v between the AC terminals becomes a zero voltage during the other time periods, and sets the compensation period φ such that a time period during which the voltage v between the AC terminals becomes a zero voltage is the shortest. |
申请公布号 |
US9231494(B2) |
申请公布日期 |
2016.01.05 |
申请号 |
US201414322188 |
申请日期 |
2014.07.02 |
申请人 |
CENTRAL JAPAN RAILWAY COMPANY;FUJI ELECTRIC CO., LTD. |
发明人 |
Sawada Tadashi;Murai Toshiaki;Hagiwara Yoshiyasu;Tobikawa Masayuki;Saga Ayako;Nishijima Tomotaka;Kaneko Toshiya |
分类号 |
H02M7/5388;H02M7/219;H02J5/00;H02M1/42 |
主分类号 |
H02M7/5388 |
代理机构 |
Rabin & Berdo, P.C. |
代理人 |
Rabin & Berdo, P.C. |
主权项 |
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 forming a resonance circuit with the power receiving coil, and another end of the power receiving coil is connected to another AC terminal; a smoothing capacitor configured to be connected between direct-current (DC) terminals of the bridge circuit, and to be connected to both ends of a load; a current detection unit configured to detect an input current that flows through the power receiving coil; a voltage detection unit configured to detect a voltage between the DC terminals of the bridge circuit; and a control unit configured to switch a semiconductor switch in the bridge circuit, the bridge circuit including a plurality of switching arms each of which comprises an inverse-parallel connection of the semiconductor switch and a diode, wherein the control unit switches the semiconductor switch such that a voltage between the AC terminals of the bridge circuit becomes a positive-negative voltage whose peak value is the voltage between the DC terminals only during prescribed equal time periods before and after a point that has deviated from each zero crossing point in one cycle of the input current by a prescribed compensation period and such that the voltage between the AC terminals becomes a zero voltage during time periods other than said prescribed equal time periods, and sets the compensation period such that a time period during which the voltage between the AC terminals becomes a zero voltage is minimized to maximize an input power factor. |
地址 |
Nagoya-Shi JP |