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Signal decoding circuit applied to wireless charging or radio frequency identification system

A technology of radio frequency identification system and decoding circuit, which is applied in the field of signal decoding circuit applied to wireless charging or radio frequency identification system, and can solve problems such as screen lighting, screen extinguishing, and coil failing to pass inspection

Active Publication Date: 2017-11-17
GENERALPLUS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, when the load is heavy, the transmission code received by the transmitting end changes too much, exceeding the input and output limits of the analog circuit used by the decoding circuit. Simply using the standard decoding circuit of the Wireless Power Consortium often leads to decoding mistake
[0012] After the applicant implements the standard decoding circuit of the Wireless Power Consortium, it will be submitted to the QI standard for inspection. Among the five standard test coils, three coils will fail to pass the inspection.
In addition, the applicant uses the wireless charging circuit to cooperate with the QI standard circuit to conduct charging experiments on mobile devices. During the experiment, when the load is heavy or the mobile device is placed in a shifted position, the mobile device will be charged and offline. , charging, offline... a phenomenon that occurs cyclically
At the same time, the mobile device will light up the screen and turn off the screen in a cycle

Method used

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  • Signal decoding circuit applied to wireless charging or radio frequency identification system
  • Signal decoding circuit applied to wireless charging or radio frequency identification system
  • Signal decoding circuit applied to wireless charging or radio frequency identification system

Examples

Experimental program
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Effect test

no. 1 example

[0068] figure 2 Shown is a circuit block diagram of a signal decoding circuit applied to a wireless charging or radio frequency identification system according to an embodiment of the present invention. Please refer to figure 2 , the signal decoding circuit applied to wireless charging or radio frequency identification system includes an upper bridge switch 201 , a lower bridge switch 202 , an LC resonant circuit 203 , a voltage decoding circuit 204 , a current decoding circuit 205 , and a control circuit 206 .

[0069] The high-bridge switch 201 includes a first terminal, a second terminal and a control terminal, wherein the first terminal of the high-bridge switch 201 is coupled to a power supply voltage VDD. The lower bridge switch 202 includes a first end, a second end and a control end, wherein the first end of the lower bridge switch 202 is coupled to the second end of the upper bridge switch, and the second end of the lower bridge switch 202 is coupled to a total Co...

no. 2 example

[0083] Figure 4 Shown is a circuit diagram of a voltage decoding circuit applied to a wireless charging or RFID system according to an embodiment of the present invention. Please refer to Figure 4 , the voltage decoding circuit includes a peak detection circuit composed of a diode D6, a resistor R31 and a capacitor C39, an isolation capacitor C33, a DC bias circuit composed of a voltage divider composed of a resistor R43 and R42, and a buffer circuit composed of an amplifier U7A, a signal amplifier made up of resistors R44, R45, R46, capacitors C36, C37 and amplifier U7B, a first filter circuit made up of resistor R48 and capacitor C42, a second filter circuit made up of resistor R19 and capacitor C27, and A Schmitt trigger (comparator) composed of resistors R18, R29 and amplifier U7C.

[0084] Firstly, the voltage at the node V back will pass through the peak detection circuit composed of the diode D6, the resistor R31 and the capacitor C39 to obtain a peak signal. Since...

no. 3 example

[0087] Figure 5 Shown is a circuit diagram of a current decoding circuit applied to a wireless charging or RFID system according to an embodiment of the present invention. Please refer to Figure 5 , the current decoding circuit includes a current sensing resistor R32 coupled to the lower bridge switch 202 , a primary amplifier 501 composed of resistors R54 , R66 , R68 , capacitor C28 and amplifier U7D, and a high current decoding circuit 502 . Wherein, the high current decoding circuit 502 includes a high cut-off frequency filter (resistor R22 and capacitor C40 ), a low cut-off frequency filter (resistor R23 and capacitor C43 ), and a comparator U9A.

[0088] This circuit converts the current originally flowing through the lower bridge switch 202 into a current sensing voltage IDC through the current sensing resistor R32, and then initially amplifies the current sensing voltage IDC through the primary amplifier. Next, the amplified After filtering out noise (resistor R22 a...

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Abstract

The invention relates to a signal decoding circuit applied to a wireless charging or radio frequency identification system. In an embodiment of the present invention, a current sensing resistor is additionally added to the upper bridge switch or the lower bridge switch, and decoding is performed according to the signal on the current sensing resistor. Due to the voltage decoding of general wireless power or radio frequency identification (RFID), the signal changes too much during heavy loads, resulting in decoding errors, resulting in the wireless charging mobile device constantly reciprocating charging and offline... This case adopts the technology of simultaneous decoding of current and voltage, so that it can be successfully decoded regardless of light load or heavy load.

Description

technical field [0001] The present invention is about a radio frequency identification (Radio Frequency Identification, RFID) or wireless power transmission feedback technology. More specifically, the present invention is about a signal decoding (demodulation) circuit and method. Background technique [0002] Wireless charging technology is a technology that uses magnets to charge devices without using wires at all. Wireless charging technology, derived from wireless power transmission technology, uses magnetic resonance to transmit charges in the air between the charger and the device, and coils and capacitors form resonance between the charger and the device to achieve efficient power transmission technology. Wireless charging is safer, and has no exposed connectors, leakage, and runaway characteristics, and thus avoids various problems of wired charging. [0003] Due to the development of this technology, the Wireless Power Consortium (Wireless Power Consortium) was bor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/00
Inventor 庄珰旭
Owner GENERALPLUS TECH INC
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