POWER TRANSMISSION APPARATUS, AND POWER TRANSMITTING DEVICE AND POWER RECEIVING DEVICE FOR THE POWER TRANSMISSION APPARATUS

• US 20150015081A1
• Filed: 07/11/2014
• Published: 01/15/2015
• Est. Priority Date: 07/12/2013
• Status: Active Grant

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Usami, Yutaka
• Granted Patent: US 10,128,687 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• 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

There is provided a non-contact power transmission apparatus which can supply stable power from a power transmitting side to a power receiving side even if a load is changed. The power transmission apparatus transmits power from a power transmitting device to a power receiving device in a non-contact manner. The power transmitting device includes a series circuit which is connected to a direct-current power source, and includes a parallel resonance circuit including a first capacitor and a first inductor, and a switch element, a drive source to drive on or off the switch element, and a first series resonance circuit connected to a connection point between the parallel resonance circuit and the switch element and including a second inductor, a second capacitor and a power transmission coil. The power receiving device includes a second series resonance circuit including a power receiving coil paired with the power transmission coil and a third capacitor connected in series to the power receiving coil, and a rectifying circuit to rectify a voltage generated in the second series resonance circuit and to supply the voltage to a load circuit.

Claims

1. A power transmission apparatus for transmitting power from a power transmitting device to a power receiving device in a non-contact manner, wherein

the power transmitting device comprises:

a series circuit which is connected between a direct-current power source and a reference potential point, and includes a parallel resonance circuit including a first capacitor and a first inductor, and a switch element including a parasitic diode in parallel to a main current path;

a drive source to drive on or off the switch element; and

a first series resonance circuit which is connected to a connection point between the parallel resonance circuit and the switch element and includes a second inductor, a second capacitor and a power transmission coil, and

the power receiving device comprises;

a second series resonance circuit including a power receiving coil paired with the power transmission coil, and a third capacitor connected in series to the power receiving coil; and

a rectifying circuit to rectify a voltage generated in the second series resonance circuit and to supply the voltage to a load circuit.

2. The apparatus according to claim 1, wherein a resonance frequency f1 of the parallel resonance circuit is set to be 1.1 to 1.2 times a drive frequency f0 of the switch element, and a resonance frequency f2 of the first series resonance circuit is set to be 0.8 to 0.9 times f0.

3. The apparatus according to claim 1, wherein a resonance frequency f3 of the second series resonance circuit is set in a range of 0.9 to 1.0 (f3≠

f0) of a drive frequency f0 of the switch element.

4. A power transmitting device for transmitting power to a power receiving device in a non-contact manner, comprising:

a series circuit which is connected between a direct-current power source and a reference potential point, and includes a parallel resonance circuit including a first capacitor and a first inductor, and a switch element including a parasitic diode in parallel to a main current path;

a drive source to drive on or off the switch element; and

a first series resonance circuit which is connected to a connection point between the parallel resonance circuit and the switch element and includes a second inductor, a second capacitor and a power transmission coil.

5. A power receiving device for receiving power from a power transmitting device in a non-contact manner, comprising:

a second series resonance circuit including a power receiving coil paired with a power transmission coil of the power transmitting device, and a third capacitor connected in series to the power receiving coil; and

a rectifying circuit to rectify a voltage generated in the second series resonance circuit and to supply the voltage to a load circuit.