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Dynamic Power Path Management (DPPM) of Chargers
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Previous article: ① Understanding Battery Management IC (Charger)?
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Previous article: ② Charger Part Two: Input Voltage Dynamic Power Principle (VIN-DPM)
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DPPM stands for Dynamic Power Path Management, a concept in battery management ICs used to balance the voltage output from the Charger to the downstream system load and the charging voltage. With DPPM, regardless of whether the battery is depleted, as long as the Charger is connected to an adapter, the system load will immediately receive power. Additionally, under the regulation of DPPM, it ensures the fastest charging while preventing the system from shutting down due to insufficient adapter power.
When the adapter’s output capability is sufficient, the Charger powers the system while charging the battery.
When the system load increases beyond the maximum output capability of the adapter, the VSYS voltage will drop, falling to the DPPM threshold, DPPM will reduce the battery charging current to ensure the power supply capability of VSYS.
3. Continued Increase in System Load
When reducing the charging current to 0 is still insufficient to meet the system’s power requirements, the VSYS voltage will continue to drop until it falls below the battery voltage, at which point the battery begins to supply power to the system to meet its power demands.
4. System Load Returns to Normal Value
Once the system load returns to normal, the Charger resumes normal charging of the battery.
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The previous article also introduced the concept of VIN-DPM, Charger Part Two: Input Voltage Dynamic Power Principle (VIN-DPM) Many people easily confuse the two; some online explanations are not clear. In fact, the two concepts are different, although both are adjustments caused by insufficient adapter output capability, VIN-DPM adjusts when the Charger’s input voltage VIN is insufficient, while DPPM adjusts when the Charger’s output VSYS is insufficient.
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