Auxiliary Power Supply Charge Control for Internal Resistance Sensing
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Solution Overview
Problem
Existing power supply devices face challenges in ensuring accurate calculation of the internal resistance of auxiliary power supplies during charging, which is crucial for reliable deterioration diagnosis.
Innovation Solution
The power supply device includes a control circuit that connects the auxiliary power supply to the main power supply during charging, calculates the internal resistance based on the charging current, and disconnects the auxiliary power supply from the boost circuit when its voltage falls below a threshold, ensuring accurate resistance calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary power supply voltage is maintained at a high level during normal operation, then the power supply can continuously support the load, but the charging current becomes insufficient for accurate internal resistance calculation
Solution Approach 1:
The control circuit preliminarily discharges the auxiliary power supply to a voltage below the threshold before charging begins, ensuring that sufficient charging current flows during the subsequent charging phase. This preliminary action creates optimal conditions for accurate internal resistance calculation by guaranteeing a measurable voltage change during charging.
Solution Approach 2:
The system implements periodic discharge-charge cycles of the auxiliary power supply. During each cycle, the supply is discharged below the threshold voltage, then charged while measurements are taken. This periodic resetting ensures that sufficient charging current consistently flows during each charging phase, maintaining measurement accuracy across multiple operation cycles.
2Measurement precision
If the auxiliary power supply is disconnected from the boost circuit during low voltage, then internal resistance calculation accuracy improves, but the control circuit loses power supply continuity
Solution Approach 1:
The control circuit is preliminarily powered by the main power supply before the auxiliary power supply is disconnected. This allows the control circuit to maintain operation and execute the disconnection logic seamlessly, ensuring continuous operation without interruption when switching between power sources.
Solution Approach 2:
The main power supply acts as an intermediary power source that temporarily supports the control circuit during the transition when the auxiliary power supply is disconnected from the boost circuit. This intermediary power supply ensures the control circuit remains operational throughout the disconnection period.
3Measurement precision
If the auxiliary power supply voltage is allowed to drop below threshold, then sufficient charging current flows for accurate measurement, but the power supply capacity decreases
Solution Approach 1:
The system employs periodic discharge-charge cycles where the auxiliary power supply is deliberately discharged below the threshold voltage, then recharged to full capacity. This periodic replenishment restores the power supply capacity after each measurement cycle, ensuring the supply maintains sufficient energy reserves for continuous operation while enabling accurate periodic measurements.
Solution Approach 2:
The charging process continuously replenishes the auxiliary power supply capacity after discharge. By maintaining continuous charging action following the discharge below threshold, the system ensures that the power supply capacity is restored and maintained, preventing permanent loss of capacity while enabling repeated accurate measurements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures accurate calculation of the internal resistance of the auxiliary power supply, enhancing the reliability of deterioration diagnosis and maintaining system efficiency.
Implementation Method 1
a charge circuit disposed in a charge path between the main power supply and the auxiliary power supply, the charge circuit being configured to charge the auxiliary power supply by using the electric power from the main power supply
Implementation Method 2
a boost circuit disposed in a discharge path between the auxiliary power supply and the power feeding target, the boost circuit being configured to boost an output voltage of the auxiliary power supply
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A control circuit (24) of a power supply device (10) forms a state in which an auxiliary power supply (22) is connected via a charge circuit (21) to a main power supply (11) when a power switch (13) provided on a power feeding path is turned on. The control circuit (24) calculates an internal resistance of the auxiliary power supply (22) based on a charging current (I). The control circuit (24) forms a state in which the power supply device (10) is disconnected from the main power supply (11) and a power feeding target (12), and only the auxiliary power supply (22) and a boost circuit (23) are connected to each other when the power switch (13) is turned off. The control circuit (24) disconnects the auxiliary power supply (22) from the boost circuit (23) when a terminal voltage (V2) of the auxiliary power supply (22) is less than a stop determination threshold value.