Power supply establishing method suitable for multi-battery pack application system
A technology of an application system and an establishment method, which is applied in the field of power supply establishment of a multi-cell battery pack application system, can solve the problem that the system power supply cannot be established normally, and achieves the effect of solving the repeated start-up.
Inactive Publication Date: 2021-12-17
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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Problems solved by technology
Usually, in mobile phone PMIC applications, a capacitor of the order of 100uF or more is attached to the rear stage of the system power supply, that is, the capacitance of the system power supply is much larger than the effective capacitance of the V1X power supply. Therefore, a short-circuit state will appear on the V1X terminal when the BATFET is turned on. Charge the capacitor where the system power supply is located. If the system chooses to power on to shield the overvoltage / overcurrent protection of the charge pump, the reliability risk of the chip will occur. If the system chooses to keep all the protection mechanisms of the charge pump, the charge pump will instantly trigger the overcurrent protection. After stopping operation, the sequential power supply establishes relationship as image 3 As shown, after the charge pump is turned off, it will start automatically after a delay for a period of time. After the BATFET is turned on again, it will trigger the protection of the charge pump and then turn off again. This repeated state will make the system power cannot be established normally.
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[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] The system power supply proposed by the present invention mainly has four stages: Stage 1, BATFET is turned on, V1X capacitance charge and system power supply capacitance charge carry out charge sharing, system power supply VSYS rises, V1X drops; Stage 2, when V1X voltage is lower than BATFET detection After the undervoltage protection, the BATFET is turned off again, and the VSYS voltage is in the HOLD state; in the third stage, the V1X voltage is precharged to around half of the V2X, and the BATFET is turned on for the second time after the V1X undervoltage protection debounce time expires, and the VSYS is charged to After being equal to the V1X level, the hysteresis voltage mode state is maintained, and the hysteresis voltage frequency and ripple can be adjusted and changed by the pre-charging circuit; in the fourth stage, the AP responds and judges that the...
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The invention belongs to the technical field of battery management and charging, and relates to a power supply establishing method suitable for a multi-battery pack application system. According to the power supply establishing method suitable for the multi-battery pack application system of the invention, after the slow start of a charge pump is finished, the half-voltage relationship between the V1X and the V2X is maintained by adopting a method of pre-charging / discharging a capacitor where the V1X is located by a switching current source. Because the pre-charging mode is a current limiting state, a BATFET does not need to trigger a protection mechanism to be restarted after being turned on. Compared with a traditional technical scheme, the pre-charging system power supply implementation method provided by the invention can solve the problem of repeated starting in the power-on process of a system power supply.
Description
technical field [0001] The invention belongs to the technical field of battery management and charging, and in particular relates to a method for establishing a power source suitable for a multi-section battery pack application system. Background technique [0002] The charging and discharging topology based on 2S battery combination is as follows: figure 1 As shown, the adapter output power supply VADP supplies power to the system power supply VSYS through a step-down inductive DC-DC BUCK, and at the same time charges the battery pack through the BATFET switch and the reverse 1:2 charge pump CP (Charge Pump, charge pump), and the BATFET switch It can play the role of regulating the charging current, and the CP connects the BATFET output V1X to the battery after a 1:2 boost. When the adapter is not in place, the battery pack enters the discharge mode, BATFET will choose to configure the direct mode, and the battery voltage is reduced by 2:1CP to supply power to the system p...
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IPC IPC(8): H02J7/00H02M3/07
CPCH02J7/0024H02M3/07
Inventor 胡佳俊何思雨梁星
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD