Constant-Current Control Circuit for Series Battery Blocks
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Solution Overview
Problem
Existing power supply devices with series-connected battery blocks in parallel suffer from rush current issues, leading to potential damage, significant power loss, and capacity imbalance, which affects discharge time and safety.
Innovation Solution
Incorporating a constant-current control circuit for each series-connected battery block, utilizing FETs as current control elements to manage and regulate current flow, preventing excessive current and maintaining capacity balance among blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If series-connected battery blocks are connected in parallel without current control, then the power supply capacity is increased, but rush current flows from high potential blocks to low potential blocks causing potential damage
Solution Approach 1:
A diode is introduced as an intermediary component between battery blocks to prevent reverse current flow. The diode allows current to flow in only one direction, blocking the harmful rush current from high potential blocks to low potential blocks while maintaining the parallel connection structure for increased power supply capacity
Solution Approach 2:
The potential difference parameter is managed by controlling the direction of current flow through diodes. By changing the electrical parameter control method from passive parallel connection to active diode-controlled connection, the system prevents rush current while maintaining capacity benefits
2Reliability
If diodes are used to prevent reverse current in parallel-connected battery blocks, then rush current is prevented, but significant power loss occurs due to the diode voltage threshold
Solution Approach 1:
The diode component is extracted and replaced with a transistor-based constant current control circuit. This removes the fixed voltage threshold loss characteristic of diodes and replaces it with an adjustable electronic control mechanism that can maintain reverse current prevention with minimal power loss
Solution Approach 2:
The passive mechanical/electrical diode component is replaced with an active electronic transistor control system. The transistor, controlled by a constant current circuit, substitutes the diode's one-way current blocking function while enabling precise current management with significantly reduced power loss
3Quantity of substance
If multiple series-connected battery blocks are connected in parallel, then the power supply capacity is increased, but capacity imbalance among blocks occurs affecting discharge time
Solution Approach 1:
A constant current control circuit provides feedback control for each battery block's current output. By continuously monitoring and adjusting the current based on each block's state, the system maintains capacity balance among parallel-connected blocks, ensuring all blocks discharge at consistent rates and maximizing overall discharge time
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
The solution effectively reduces power loss, extends discharge time, and enhances safety by maintaining capacity balance among battery blocks, preventing damage from rush currents and optimizing discharge performance.
Implementation Method 1
utilizing FETs as current control elements to manage and regulate current flow
Data Source
AI summary
A power supply device having a plurality of series-connected-battery blocks which are connected in parallel and in which two or more secondary cells capable of charging and discharging are connected in series, includes a constant-current control circuit provided for each of the series-connected-battery blocks.