Charging Device Series Voltage Drooping Control
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Solution Overview
Problem
Existing charging devices that connect multiple DC power supply devices in series are limited to a narrow voltage range to enhance power supply efficiency, preventing the charging of batteries with voltages outside this range.
Innovation Solution
A charging device configuration that includes a power supply device with constant current voltage drooping overcurrent protection and a DC-DC converter, allowing the device to shift operation states to charge batteries with low or high voltages by adjusting the charging current and voltage, ensuring efficient charging across a broader voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple DC power supply devices are connected in series with limited voltage range to enhance power supply efficiency, then power supply efficiency is improved, but the charging capability for batteries with voltages outside the limited range is lost
Solution Approach 1:
The patent implements dynamic operation state management where power supply devices are sequentially shifted between operation and stop states based on real-time battery voltage conditions. The control unit activates additional power supply devices only when the battery voltage exceeds the cumulative voltage capacity of currently active devices, ensuring each device operates within its efficient voltage range while adapting to varying battery voltage requirements.
Solution Approach 2:
The system changes operational parameters by adjusting which power supply devices are active based on battery voltage thresholds. When battery voltage reaches the sum of maximum output voltages of currently operating devices, the control unit activates the next device in series, thereby expanding the total voltage range while maintaining efficient operation of individual devices throughout the charging process.
2Power
If all DC power supply devices operate simultaneously to charge low voltage batteries, then charging current is sufficient, but power supply efficiency deteriorates
Solution Approach 1:
The control system dynamically adjusts the number of active power supply devices based on battery voltage. During low-voltage charging phases, only the necessary number of devices operate to provide sufficient current while avoiding the efficiency loss that would occur if all devices operated simultaneously at suboptimal voltage levels.
Solution Approach 2:
The system applies partial action by activating only the minimum number of power supply devices needed for the current charging stage. Rather than all devices operating simultaneously, the control unit selectively engages devices based on whether the battery voltage exceeds the cumulative output of active devices, thereby avoiding excessive action that would waste energy.
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
Enables the charging of batteries with low or high voltages while maintaining high power supply efficiency by sequentially shifting power supply devices into operation states and adjusting charging currents, minimizing the number of devices used and avoiding simultaneous operation at low efficiency.
Implementation Method 1
a DC-DC converter that is connected to the power supply device in series... and that output a second direct current voltage between the second positive output terminal and the second negative output terminal. The DC-DC converter outputs the second direct current voltage by receiving the first direct current voltage as an operation voltage
Data Source
AI summary
A charging device is configured with a power supply device and a DC-DC converter that have constant current voltage drooping type overcurrent protection characteristics and that are connected in series. A constant current value in a voltage drooping state of the DC-DC converter is lower than a constant current value in a voltage drooping state of the power supply device. The DC-DC converter is shifted to an operation state to supply a charging current of the constant current value to a charging target when a voltage value of a direct current voltage that is output from the power supply device reaches a maximum output voltage value or an approximate value thereof. Therefore, the charging target can be charged to a higher voltage even though a charging voltage of the charging target is low.