Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system
A technology of control devices and power receiving devices, which is applied in the direction of circuit devices, electromagnetic wave systems, battery circuit devices, etc., and can solve problems such as difficult to accurately detect load status, distance and position relationship deviation, threshold voltage deviation, etc.
Active Publication Date: 2009-05-27
SEIKO EPSON CORP
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Problems solved by technology
However, the threshold voltage for judging the detection voltage also varies due to fluctuations in the power supply voltage, fluctuations in the distance and positional relationship between coils, and deviations in element constants such as coil inductance.
Therefore, there arises a problem that it is difficult to accurately detect the load state on the power receiving side
Method used
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Embodiment Construction
[0077] Preferred embodiments of the present invention will be described in detail below. In addition, the present embodiment described below does not unduly limit the content of the present invention described in the claims, and all the configurations described in the present embodiment are not necessarily essential to the solution of the present invention.
[0078] 1. Electronic equipment
[0079] figure 1 (A) shows an example of electronic equipment to which the contactless power transmission method of this embodiment is applied. A charger 500 (cradle), which is one of electronic devices, has a power transmission device 10 . Furthermore, a mobile phone 510 as one of electronic devices has a power receiving device 40 . Mobile phone 510 further includes a display unit 512 such as an LCD, an operation unit 514 including buttons and the like, a microphone 516 (voice input unit), a speaker 518 (voice output unit), and an antenna 520 .
[0080] Electric power is supplied to th...
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The invention provides a power transmission control device which can exactly detect a power-receiving-side load state, a power transmitting device, electronic equipment and a non-contact power transmission system. The power transmission control device which is arranged in the power transmitting device of the non-contact power transmission system comprises: a driver control circuit which controls a power transmitting driver for driving a primary coil; a load state detection circuit used for detecting the power-receiving-side load state; and a control circuit used for controlling the power transmission control device. The control circuit acquires a reference value used to determine the power-receiving-side load state after starting normal power transmission in a reference value acquisition period, wherein the reference value acquisition period is a period after receiving ID authentication information from a power receiving device, but before starting the normal power transmission.
Description
technical field [0001] The invention relates to a power transmission control device, a power transmission device, electronic equipment, a non-contact power transmission system and the like. Background technique [0002] In recent years, a contactless power transmission (non-contact power transmission) that utilizes electromagnetic induction and enables power transmission even without a contact of a metal part has attracted attention. As an application example of this non-contact power transmission, charging of a cellular phone or a household appliance (such as a handset of a telephone) and the like have been proposed. [0003] There is Patent Document 1 as a prior art of contactless power transmission. In this patent document 1, data transmission from a power receiving device (secondary side) to a power transmitting device (primary side) is realized by so-called load modulation. Then, the power transmission device detects the induced voltage of the primary coil with a comp...
Claims
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IPC IPC(8): H02J17/00H04B5/48
CPCH02J7/025H02J7/00045H02J7/00304H02J50/80H02J50/60H02J50/10H02J50/90H02J50/12
Inventor 饭坂健上条贵宏大西幸太神山正之盐崎伸敬
Owner SEIKO EPSON CORP