Battery Equalizer Noise Prevention Circuit
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Solution Overview
Problem
Conventional battery equalizers for cars suffer from unstable internal ground due to wire impedance, leading to erroneous operations and failure to meet electrical characteristic test standards due to internal and external noise.
Innovation Solution
A battery equalizer with a power converting unit to maintain equal charge voltages in batteries and a noise preventing unit connected between the power converting unit and external case to remove conductive and surge noise, using capacitors and resistors to form internal and external grounds and filter noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground of the battery equalizer is connected to the battery ground through a long wire, then the connection is established, but the internal ground becomes unstable due to wire impedance and noise
Solution Approach 1:
The patent extracts the ground connection from the external wire-based system and relocates it to an internal ground terminal within the equalizer housing. This eliminates the long wire connection that caused impedance and noise issues, while maintaining the necessary ground connection functionality through a direct internal connection between the ground terminal and the negative terminal of the battery.
Solution Approach 2:
The patent introduces a ground terminal as an intermediary component that serves as the connection point between the equalizer circuit and the battery ground. This ground terminal acts as a mediator that eliminates the need for long external wiring while maintaining proper grounding, thereby resolving the impedance and noise problems associated with long wire connections.
2Ease of manufacture
If conventional wire-based grounding is used, then the structure is simple, but electrical characteristic test standards are not satisfied due to noise
Solution Approach 1:
The patent creates an equipotential ground connection by directly connecting the ground terminal to the negative terminal of the battery through the equalizer housing. This eliminates potential differences and voltage drops that occur in long wire connections, ensuring stable ground potential that meets electrical characteristic test standards while maintaining manufacturing simplicity.
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
Improves electrical characteristics by preventing noise-generated errors and ensuring stable voltage balance between batteries, thus preventing over-discharge and over-charge issues.
Implementation Method 1
at least one capacitor is connected between the ground terminal and the power source terminal to remove conductive noise generated in the power source circuit
Implementation Method 2
an RC filter including at least one resistor and at least one capacitor is connected between the ground terminal and the battery terminal to remove surge noise generated in the battery
Data Source
AI summary
There is provided a battery equalizer for cars. The battery equalizer for cars includes a battery module including first and second batteries and a battery equalizer mounted in the battery module to sustain charge voltages of the first and second batteries to be the same. The battery equalizer includes a power converting unit for converting power so that the charge voltages are equally charged in the first and second batteries and a noise preventing unit connected between the power converting unit and an external case to remove conductive noise of the power converting unit and surge noise of the external case.