Cable Compensation Circuit for High Current Voltage Drop
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Solution Overview
Problem
High output currents in cables connected between a charger and a battery result in significant voltage drops, reducing the voltage supplied to the battery below the rated level due to increased voltage drops in the cables.
Innovation Solution
A cable compensation circuit is introduced, which includes a diode and resistors to increase the anode voltage and impedance of the shunt regulator, generating a feedback voltage that adjusts the energy transmission to the secondary side of the power supply device, thereby compensating for the voltage drop by increasing the energy transmitted as the output current increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high output current is supplied to the battery, then charging speed is improved, but voltage drop in the cable increases causing the voltage supplied to the battery to decrease below rated level
Solution Approach 1:
The patent implements a feedback mechanism where the voltage drop detected at the cable is fed back to the power supply device. The power supply device measures the actual voltage at the battery端 through voltage detection circuits, compares it with the rated voltage, and automatically adjusts the output voltage to compensate for the cable voltage drop. This closed-loop feedback control ensures the battery receives the correct voltage despite cable losses during high-current charging.
Solution Approach 2:
The patent introduces an intermediary compensation circuit between the power supply device and the battery. This circuit includes voltage detection units, adjustment units, and compensation units that act as intermediaries to measure the actual voltage condition, process the information, and generate compensatory signals. The intermediary circuit translates the voltage drop information into appropriate power supply adjustments without requiring direct modification of the cable or battery.
2Reliability
If cable length or resistance is reduced to minimize voltage drop, then voltage stability is improved, but device complexity or manufacturing cost increases
Solution Approach 1:
The patent dynamically changes the power supply output parameters (voltage and current) based on real-time cable conditions. By detecting the actual voltage drop and adjusting the output parameters accordingly, the system compensates for cable losses without requiring physical changes to the cable. This allows the use of standard cable specifications while maintaining voltage stability through electronic parameter adjustment.
Solution Approach 2:
The patent replaces the mechanical/physical approach of using thicker or shorter cables with an electronic control system. Instead of modifying the physical cable characteristics to reduce resistance, the system uses electronic detection and control circuits to measure and compensate for voltage drops. This substitution of mechanical solution with electronic control reduces device complexity and manufacturing costs associated with specialized cable requirements.
3Reliability
If power supply device output voltage is increased to compensate for voltage drop, then voltage supplied to battery is maintained, but energy loss in the cable increases
Solution Approach 1:
The patent employs dynamic adjustment of the power supply output voltage based on real-time loading conditions and cable characteristics. Rather than continuously over-volting, the system dynamically modulates the output voltage to provide just enough compensation for the actual voltage drop occurring at any given moment. This dynamic control minimizes energy loss by avoiding excessive voltage application when cable losses are naturally lower.
Solution Approach 2:
The patent applies partial compensation rather than excessive voltage increase. The compensation amount is precisely calculated based on the detected voltage drop, applying only the necessary correction to maintain rated voltage at the battery端. This partial action approach avoids the energy waste that would result from continuously applying excessive voltage, optimizing the balance between voltage stability and energy efficiency.
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 circuit effectively maintains the voltage supplied to the battery at the rated level by increasing energy transmission to the secondary side, thereby compensating for the voltage drop in the cables, even at high output currents.
Implementation Method 1
a diode in which an anode voltage is increased according to an increase of an output current of the power supply device
Implementation Method 2
a cathode impedance of the shunt regulator is controlled according to a voltage of the second node
Data Source
AI summary
One cable compensation circuit is connected to a shunt regulator to generate a feedback voltage corresponding to an output voltage of a power supply device. The cable compensation circuit controls cathode impedance of the shunt regulator according to the output current of the power supply device to compensate a voltage drop generated in a cable.