A power supply establishment method suitable for multi-cell battery pack application system
By using a pre-charge circuit to charge the V1X capacitor in the current limit mode after the charge pump is slowed down, the reliability risks and repeated start problems caused by the charge pump short circuit state in the traditional battery management system are solved, and the normal establishment and stable operation of the system power supply are achieved.
Patent Information
- Application Number
- CN202210863040.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2021-10-18
- Filing Date
- 2022-07-21
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2042-07-21
AI Technical Summary
In traditional battery management systems, charge pumps may have short circuits in the system power supply establishment timing relationship, resulting in chip reliability risks, and repeated start-ups will cause the system power supply to be unable to be established normally.
The pre-charge system power implementation method is adopted. By pre-charge/discharge the V1X capacitor by using the switch source/sink current source after the charge pump is slowed down, the half-voltage relationship between V1X and V2X is maintained, the short-circuit state when the BATFET is turned on, and after the system power supply is established, the charge pump exits the pre-charge mode and enters the main power switch mode.
It solves the problem of repeatedly starting the system power supply during power-on, ensures that the system power supply can be established normally, and improves the reliability and system stability of the charge pump.