CONTACTLESS ELECTRIC POWER SUPPLY DEVICE

• US 20170201124A1
• Filed: 07/16/2014
• Published: 07/13/2017
• Est. Priority Date: 07/16/2014
• Status: Active Grant

• Current Assignee: Fuji Corporation
• Original Assignee: Fuji Machine Manufacturing Company Limited (Fuji Corporation)
• Inventors: SAITO, Masaru, TAKIKAWA, Shinji
• Granted Patent: US 10,305,326 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A contactless electric power supply device includes: a supply coil provided on a supply side device; a high frequency power source circuit that applies high frequency voltage to the supply coil; a receiver coil provided on a receiver side device that is arranged facing the supply side device, the receiver coil receiving high frequency electric power by contactless electric power supply via electromagnetic coupling with the supply coil; a receiver circuit that converts the high frequency electric power received by the receiver coil and supplies power to an electric load of the supply side device; and a supplementary coil provided on the supply side device, the supplementary coil interlinking with at least a portion of a magnetic circuit that electromagnetically couples the supply coil and the receiver coil.

Claims

1. A contactless electric power supply device comprising:

a supply coil provided on a supply side device;

a high frequency power source circuit that applies high frequency voltage to the supply coil;

a receiver coil provided on a receiver side device that is arranged facing the supply side device, the receiver coil receiving high frequency electric power by contactless electric power supply via electromagnetic coupling with the supply coil;

a receiver circuit that converts the high frequency electric power received by the receiver coil and supplies power to an electric load of the supply side device; and

a supplementary coil provided on the supply side device, the supplementary coil interlinking with at least a portion of a magnetic circuit that electromagnetically couples the supply coil and the receiver coil.

2. The contactless electric power supply device according to claim 1, wherein

the supplementary coil is configured to measure the degree of electromagnetic coupling between the supply coil and the receiver coil.

3. The contactless electric power supply device according to claim 2, further including

a voltage control circuit that decreases the high frequency electric power supplied in a contactless manner by controlling at least one of the frequency, voltage value, and switching between continuous wave form and burst wave form of the high frequency voltage when the supplementary coil is measuring the degree of electromagnetic coupling.

4. The contactless electric power supply device according to claim 3, further including

a resonance capacitor that connects to at least one of the supply coil and the receiver coil to form a resonance circuit,

wherein

the voltage control circuit normally maintains the frequency of the high frequency voltage at a resonance frequency while the supplementary coil is not measuring the degree of electromagnetic coupling, and shifts the frequency of the high frequency voltage from the resonance frequency while the supplementary coil is measuring the degree of electromagnetic coupling.

5. The contactless electric power supply device according to claim 1, wherein

the supplementary coil is configured to measure the size of supply of electric current flow through the supply coil due to the high frequency voltage.

6. The contactless electric power supply device according to claim 5, further including

a current control circuit that restricts the supply of electric current by controlling at least one of the voltage value and the switching between continuous wave form and burst wave form of the high frequency voltage when the size of the supply current measured by the supplementary coil is excessive.

7. The contactless electric power supply device according to claim 1, wherein

the supplementary coil is configured to switch between measuring the degree of electromagnetic coupling between the supply coil and the receiver coil and measuring the size of supply current that flows through the supply coil due to the high frequency voltage, and

the contactless electric power supply device further includes a measurement target control circuit that sets the switching of the supplementary coil between measuring the degree of electromagnetic coupling and measuring the size of the supply current, and variably controls the high frequency voltage to be suitable for the measurement target of the supplementary coil.

8. The contactless electric power supply device according to claim 7, wherein

the measurement target control circuit sets the measurement target of the supplementary coil to the degree of electromagnetic coupling directly after the supply side device is arranged to face the receiver side device, and

switches the setting of the measurement target of the supplementary coil to the size of the supply current after confirming that the degree of electromagnetic coupling is favorable.

9. The contactless electric power supply device according to claim 1, wherein

the supply side device is a main body of a board work machine that performs specified work on a board, and

the receiver side device is a loading device that is loaded on the board work machine.

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

the main body of the board work machine is a main body of a component mounter that mounts electronic components on a board, the loading device is a component supply device that is detachably loaded on the component mounter and that supplies electronic components, the supply coil provided on the main body of the component mounter performs electromagnetic coupling and includes a supply core on which is wound the supplementary coil, the receiver coil provided on the component supply device includes a receiver core that cooperates with the supply core to perform electromagnetic coupling, and, when the component supply device is loaded on the main body of the component mounter, a connection surface of the supply core and a connection surface of the receiver core face each other and either join or approach each other with the size of the gap between the connection surfaces decreasing.