Power transmission device, electronic instrument, and waveform monitoring circuit
A power receiving device and waveform technology, applied in the fields of electronic equipment, waveform monitoring circuits, and power transmission devices, can solve problems such as waveform reduction and load state detection accuracy cannot be further improved, and achieve the effects of simple structure, strong performance and less deviation
Active Publication Date: 2011-12-07
SAMSUNG ELECTRONICS CO LTD
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- Description
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Problems solved by technology
Therefore, there is a problem that the waveform is reduced due to the voltage division, and the detection accuracy of the load state cannot be further improved.
Method used
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Embodiment Construction
[0093] Preferred embodiments of the present invention will be described in detail below. Furthermore, 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 essential to the solution of the present invention.
[0094] 1. Electronic equipment
[0095] 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 a type of electronic equipment includes a power transmission device 10 . Furthermore, a mobile phone 510 which is one type of electronic equipment 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 .
[0096] Electric power is supplied to the char...
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The invention relates to a power transmission device, an electrical device and a waveform monitoring circuit. The power transmission device of a non-contact power transmission system includes a waveform monitoring circuit that generates and outputs a waveform-monitoring induced voltage signal based on a coil end signal of a primary coil, and a power transmission control device that controls a power transmission driver that drives the primary coil, the power transmission control device receiving the waveform-monitoring induced voltage signal and detecting a change in waveform of the induced voltage signal to detect a power-reception-side load state. The waveform monitoring circuit includes a first rectifier circuit having a limiter function, the first rectifier circuit including a current-limiting resistor provided between a coil end node where the coil end signal of the primary coil is generated and a monitoring node where the waveform-monitoring induced voltage signal is generated, performing a limiter operation that clamps the induced voltage signal at a high-potential-side power supply voltage, and subjecting the induced voltage signal to half-wave rectification.
Description
technical field [0001] The invention relates to a power transmission device, electronic equipment and a waveform monitoring circuit. Background technique [0002] In recent years, attention has been paid to non-contact power transmission (non-contact power transmission) that utilizes electromagnetic induction and enables power transmission without a metal contact. As application examples of this non-contact power transmission, charging of mobile phones and household devices (for example, handsets of telephones) has been proposed. [0003] As a prior art of contactless power transmission, there is Patent Document 1. 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. The power transmission device detects the induced voltage of the primary coil by a comparator or the like, thereby detecting a change in the load state on the power receiving side (sec...
Claims
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IPC IPC(8): H02J17/00
Inventor 神干基上条贵宏依田健太郎曾我部治彦大西幸太饭坂健
Owner SAMSUNG ELECTRONICS CO LTD