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A circuit and method for implementing trickle charging in a switch mode charger

A switching mode and trickle charging technology, which is applied to battery circuit devices, secondary battery charging/discharging, collectors, etc., can solve the problem of limited application scenarios and trickle charging solutions that cannot be accurately controlled and adjusted. Current ICHG and other issues

Active Publication Date: 2022-05-10
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a circuit and method for implementing trickle charging in switch-mode chargers, which mainly solves the problem that the existing switch-mode charger trickle charging scheme cannot accurately control and adjust the size of the trickle charging current ICHG , so that its application scenarios are limited

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  • A circuit and method for implementing trickle charging in a switch mode charger
  • A circuit and method for implementing trickle charging in a switch mode charger
  • A circuit and method for implementing trickle charging in a switch mode charger

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Embodiment

[0029] Such as Figure 4 , 5 As shown, the present invention discloses a circuit for implementing trickle charging in a switch-mode charger, including current sources I1, I2, a capacitor C1 with one end connected to the current source I1 and the other end grounded, and the current source I1 and the capacitor The clamp tube Clamp connected to the connection end of C1, the MOS transistors Q1 and Q2 connected to the connection end of the current source I1 and the capacitor C1 with the drain D connected, one end connected to the source S of the MOS transistor Q2 and the other end grounded The current source I3, The comparator COMP1 whose negative pole is connected to the connection terminal of the current source I1 and the capacitor C1, the capacitor C2 whose one end is connected to the positive pole of the current source I2 and the comparator COMP1 and whose other end is grounded, and the RS trigger whose S port is connected to the output terminal of the comparator COMP1 Among t...

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Abstract

The invention discloses a circuit and method for realizing trickle charging in a switch mode charger, which mainly solves the problem that the trickle charging scheme of the existing switch mode charger cannot accurately control and adjust the size of the trickle charging current ICHG, so that Its application scenarios are limited. Use the time when the inductor current appears for time-sharing timing, introduce a pause time between two consecutive times when the inductor current appears, and use the comparator and RS flip-flop to realize the control of the average value of the charging current in the switch mode charger, so that It can achieve neither adding an additional MOSFET nor causing heat, and can also accurately control the current size of the trickle charging, which not only saves the cost but also effectively prolongs the service life of the charger. Therefore, it has high use value and promotion value.

Description

technical field [0001] The invention relates to a charging circuit, in particular to a circuit and method for trickle charging in a switch mode charger. Background technique [0002] In a traditional switching mode charger, the charging principle is to output a DC-DC to a battery VBAT, and control the charging current to VBAT to be a constant through the DC-DC output current loop. value, reference figure 1 As shown; when the VBAT voltage value is higher than the constant threshold value (usually 3V), the current that can be directly charged is usually a larger value above 1A. When the VBAT voltage is relatively low, lower than a threshold (usually 2V), the charging current at this time must be controlled to a smaller value, and this process is called the trickle charging stage. According to the battery characteristics of different battery manufacturers, the trickle mode charging also has certain differences, usually in the range of 100mA to 500mA. [0003] figure 2 It i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/44Y02E60/10
Inventor 陈鑫
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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