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
CN110601309BActive Publication Date: 2022-05-10SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
Publication Date
2022-05-10

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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.
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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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