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Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system

A technology of a control device and a power receiving device, applied in electromagnetic wave systems and other directions, can solve problems such as the inability to further improve the detection accuracy of foreign objects, and achieve the effects of stable foreign object detection, less pulse width detection, and realization of deviations

Active Publication Date: 2008-12-31
CHAMIRAUX MANAGEMENT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the accuracy of foreign object detection cannot be further improved.

Method used

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  • Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system
  • Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system
  • Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system

Examples

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Embodiment Construction

[0054] Preferred embodiments of the present invention will be described in detail below. In addition, the embodiments described below do not unreasonably limit the content of the present invention described in the claims, and not all the configurations described in the embodiments are essential technical features of the present invention.

[0055] 1. Electronic equipment

[0056] 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, cradle) as 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 . Furthermore, mobile phone 510 has display unit 512 such as LCD, operation unit 514 including buttons and the like, microphone 516 (voice input unit), speaker 518 (voice output unit), and antenna 520 .

[0057] In charger 500 , electric power is supplied through AC converter 5...

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Abstract

The present invention provides a power transmission control device, a power transmission device, and the like which can improve the precision for the foreign object detection. A power transmission control device provided in a power transmission device of a non-contact power transmission system comprises a drive clock signal generation circuit (25) that generates a drive clock signal DRCK specifying a drive frequency of a primary coil, a driver control circuit (26) that generates a driver control signal based on the drive clock signal DRCK and outputs the driver control signal to a transmission driver, a waveform detection circuit (30) that detects a change in waveform of an induced voltage signal PHIN of the primary coil L1, and a control circuit (20) that performs foreign object detection based on a detection result of the waveform detection circuit (30). Wherein, the drive clock signal generation circuit (25) outputs the drive clock signal DRCK set at a foreign object detection frequency F2 during foreign object detection, the foreign object detection frequency being a frequency differing from a normal power transmission frequency.

Description

technical field [0001] The invention relates to a power transmission control device, a power transmission device, electronic equipment and a non-contact power transmission system. Background technique [0002] In recent years, non-contact power transmission (non-contact power transmission), which can transmit power by electromagnetic induction even if there is no contact between metal parts, has attracted attention. As application examples of this non-contact power transmission, charging of mobile phones and home electric appliances (for example, handsets of telephones), etc. have been proposed. [0003] Patent Document 1 is a prior art of contactless power transmission. In this patent document 1, the power transmission device (primary side) monitors the peak value of the induced voltage signal of the primary coil and compares it with a predetermined threshold voltage to detect the load state of the power receiving side and realize metal foreign object detection. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00
Inventor 饭坂健神干基
Owner CHAMIRAUX MANAGEMENT LLC
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