Shunting method wireless charging circuit

A wireless charging and shunt circuit technology, applied in battery circuit devices, circuit devices, different battery charging, etc., can solve the problems of high battery quality and safety management requirements, fast charging time, etc., to improve charging efficiency and reasonable design structure , the effect of protecting the battery

Pending Publication Date: 2020-04-17
HAINING BERNSTEIN BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the charging time, some wireless charging schemes provide 1C (1000mAh battery is charged with 1000mA current is called 1C charging) or higher charging cu

Method used

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  • Shunting method wireless charging circuit
  • Shunting method wireless charging circuit
  • Shunting method wireless charging circuit

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] The wireless charging receiving chip adopts the SGD5141 chip, VCHG pin: external wireless charging coil, electromagnetic coupling energy is input to this port; CHS2 pin: external LED or MCU IO, charging status indication; VDD pin: chip power is positive, connected Positive terminal of rechargeable battery; CM pin: load GND, built-in lithium battery over-discharge, over-current, and short-circuit protection switch; GND pin: chip power ground, connected to the negative terminal of the rechargeable battery. The maximum constant current charging current is 120mA, and the minimum trickle current is 30mA; CM is the load GND, built-in lithium battery over-discharge, over-current, and short-circuit protection switches. CHS2 can also provide charging status indication after an external LED, 6Hz rapid flashing: abnormal state, discharge overcurrent or short circuit; 1Hz slow flashing, normal charging; steady on: the battery is fully charged, on the charging stand...

Example Embodiment

[0028] Example 2:

[0029] The SGD5141 chip is set to output a constant current; when the main controller monitors the battery voltage to be less than the lower voltage threshold Vbl or greater than the upper voltage threshold Vbh, when trickle charging is required, the control switches K1 and K2 are closed, and the resistors Rc1 and Rc2 are turned on and shunted , The system charges the battery with a small current;

[0030] When the main controller detects that the battery voltage is greater than Vbl and less than Vbh, it turns off the control switch K1 or K2, the resistor Rc1 or Rc2 does not conduct and shunt, and the system charges the battery with a larger current.

Example Embodiment

[0031] Example 3:

[0032] This embodiment charges a customized 10mAh miniature lithium battery. The minimum working current of the SGD5141 chip is 30mA. The output current of the SGD5141 chip is designed to be 35mA by adjusting the size and distance of the coil; resistance Rc=90Ω; resistance R1=48Ω; resistance R2= 400Ω. When it is detected that the battery voltage is less than 2.7V, the control switch K1 is closed, 2.7V / 90Ω=30mA, and the battery charging current is 5mA.

[0033] When the battery voltage rises> When 2.7V, open the control switch K1, close the control switch K2, 3.3V / (90Ω+48Ω / / 400Ω)=25mA, the battery charging current is 10mA.

[0034] When the battery voltage rises to 4.14V, turn off the control switch K1, K2, 4.15V / (90Ω+48Ω)=30mA, and the battery charging current is 5mA.

[0035] Stop charging when it detects that charging is complete.

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Abstract

The invention discloses a shunting method wireless charging circuit. The energy input end of a wireless charging receiving chip is connected with a receiving coil, the signal output end of the wireless charging receiving chip is grounded after being connected with a resistor Rs, and the front end of the resistor Rs is connected with the signal input end of the controller and used for detecting theworking state of the wireless charging receiving chip; a battery is connected between the energy output end of the wireless charging receiving chip and the grounding end of the wireless charging receiving chip and used for charging the battery to charge the battery; a shunt circuit is further connected between the energy output end and the grounding end in parallel, and a control switch on the shunt circuit is connected with the signal output end of the controller; and a battery voltage monitoring circuit in the controller is connected between the energy output end of the wireless charging receiving chip and the load grounding end. The structure is reasonable, the battery can be effectively protected, and the charging efficiency is improved.

Description

technical field [0001] The invention relates to a shunt method wireless charging circuit, which belongs to the technical field of battery charging management circuits. Background technique [0002] Wireless charging technology is derived from wireless power transmission technology. Because the charger and the power-consuming device transmit energy through a magnetic field, the two are not connected by wires, so both the charger and the power-consuming device can have no exposed conductive contacts. Wireless charging technology can be divided into low-power wireless charging and high-power wireless charging. [0003] Low-power wireless charging often adopts electromagnetic induction. At present, wireless charging solutions on the market are widely used in Bluetooth headsets, wireless electric toothbrushes, mobile phones, etc. In order to reduce the charging time, some wireless charging schemes provide 1C (1000mAh battery is charged with 1000mA current is called 1C charging) ...

Claims

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Application Information

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IPC IPC(8): H02J7/04H02J50/10H02J7/00
CPCH02J7/0047H02J50/10
Inventor 郭维董树荣董婉莹刘郢
Owner HAINING BERNSTEIN BIOTECH CO LTD
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