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Electric power transmitting device, non-contact power supply system, and control method

A power transmission, non-contact technology, applied in the direction of electromagnetic wave system, transmission system, near-field transmission system, etc., can solve the problems of transmission characteristic change, resonance frequency deviation of resonant circuit, etc., achieve the effect of suppressing the scale of the circuit and improving the transmission efficiency

Active Publication Date: 2014-12-31
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic resonance type allows transmission in a narrow-band region of the frequency characteristics of the coil; therefore, there arises a problem that the resonance frequency of the resonance circuit deviates and the transmission characteristics change due to, for example, a change in the distance between the power transmission coil and the power reception coil The change of the parasitic capacitance between the windings of the coil, and the influence of the metal part of the casing of the power receiving device

Method used

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  • Electric power transmitting device, non-contact power supply system, and control method
  • Electric power transmitting device, non-contact power supply system, and control method
  • Electric power transmitting device, non-contact power supply system, and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118]

[0119] figure 1 A non-contact power supply system including a power transmission device according to Embodiment 1 is illustrated. A non-contact power supply system 3 illustrated in the figure includes a power transmitting device 1 and a power receiving device 2 . In the non-contact power supply system 3 , it is possible that power supply from the power transmitting device 1 to the power receiving device 2 is in a non-contact manner (wirelessly). Although not particularly limited, in the non-contact power supply system 3 , non-contact power transmission is realized by a magnetic resonance method utilizing resonance coupling of an electromagnetic field. For example, in contactless power transmission, the frequency of a power transmission signal (power transmission frequency) output as power to be transmitted is a frequency in the several MHz region.

[0120]

[0121] For example, the power transmission device 1 is configured with an oscillator 101, a transmission ...

Embodiment 2

[0168] Figure 5 A power transmission device according to Embodiment 2 is illustrated.

[0169] Figure 5 The power transmission device 4 illustrated in is different from the power transmission device according to Embodiment 1 in that a plurality of switchable coils are provided for adjusting the resonance frequency of the resonance circuit 110 . exist Figure 5 In the power transmission device 4 illustrated in , the same reference numerals are attached to the same components as those of the power transmission device 1 , and detailed explanations thereof are omitted.

[0170] The power transmitting device 4 is provided with a plurality of switchable coils. Figure 5 A case is illustrated in which the power transmitting device 4 is provided with four switchable coils 201 - 204 ; however, the number of switchable coils is not particularly limited.

[0171] Each of the switchable coils 201-204 can be individually controlled to connect or disconnect the connection state of bot...

Embodiment 3

[0183] Another example of the configuration of a plurality of switchable coils for adjusting the resonance frequency of the transmitting end is described below.

[0184] Figure 8 A configuration example of a switchable coil according to Embodiment 3 is illustrated.

[0185] As illustrated in the figure, a plurality of switchable coils 108_1 - 108_n (n is an integer equal to or greater than 2) are arranged around the resonant coil 106 .

[0186] Each of the switchable coils 108_1-108_n can be individually controlled to connect or disconnect the connection state of both ends thereof. Specifically, the changeover switch 109_1 is coupled between one end and the other end of the switchable coil 108_1, and by setting the changeover switch 109_1 to "ON" or "OFF", both ends of the switchable coil 108_1 are set in a connected state ( short circuit) or disconnected state (open circuit). Similarly, a changeover switch 109_2 is coupled between one end of the switchable coil 108_2 and ...

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Abstract

A non-contact power supply system is provided employing an electric power transmitting device which can improve the transmission efficiency of electric power, suppressing the circuit scale. The electric power transmitting device is configured with a resonance circuit including a resonance capacity and a resonance coil acting as a transmitting antenna, and a first coil arranged magnetically coupled with the resonance coil. The electric power transmitting device transmits electric power in a non-contact manner using resonant coupling of the resonance circuit. When transmitting the electric power, the electric power transmitting device controls the first coil to connect or disconnect both ends thereof so as to bring a resonance frequency of the resonance circuit close to a frequency of an electric power transmission signal outputted as the electric power to be transmitted.

Description

technical field [0001] The disclosure of Japanese Patent Application No. 2013-132529 filed on Jun. 25, 2013, including specification, drawings and abstract, is hereby incorporated by reference in its entirety. Background technique [0002] The present invention relates to a power transmission device that transmits electric power in a non-contact manner, a non-contact power supply system including the power transmission device, and a control method of the non-contact power supply system, and relates to when applied to, for example, resonance coupling using an electromagnetic field (Magnetic resonance) power transmission equipment is an effective technology. [0003] Practical utilization of systems using non-contact power transmission that supplies electric power to electric machines and devices in a non-contact manner without a power line medium or the like (hereinafter referred to as “contactless power supply system”) is advancing. For example, known contactless power supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00H01F38/14
CPCH02J50/12H02J50/502H04B5/263H04B5/266H04B5/24H04B5/72H04B5/79H02J50/60
Inventor 市川胜英
Owner RENESAS ELECTRONICS CORP
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