Speaker Connection Test Using Battery Voltage Reference
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Solution Overview
Problem
Conventional methods for testing connections between a power amplifier and speakers in car audio systems often incorrectly determine short-circuiting, particularly when using a booster power source, as they compare the midpoint potential of the power amplifier with the voltage of the speaker connection terminal, leading to incorrect identification of short-circuiting on the ground side when the voltage is lower.
Innovation Solution
The method involves switching the power amplifier's voltage from a booster power source to a battery voltage during the connection test, using the midpoint potential of the battery voltage as the reference for determining short-circuiting, and employing a speaker connection test processing unit to differentiate between battery and ground side short-circuiting by comparing the terminal voltage with the midpoint potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the midpoint potential of the power amplifier operating voltage is used as the reference for determining short-circuiting, then the determination is based on the current operating voltage, but incorrect identification of short-circuiting occurs when using a booster power source
Solution Approach 1:
The patent changes the reference voltage parameter from the power amplifier's operating midpoint potential to the battery voltage's midpoint potential during connection tests. This parameter change ensures that the reference remains stable and independent of the booster power source's operation, thereby preventing incorrect short-circuiting determinations while maintaining measurement precision.
2Power
If the power amplifier operates with a booster power source, then the output power is increased, but the connection test incorrectly determines short-circuiting on the ground side
Solution Approach 1:
The patent performs the connection test before activating the booster power source, or switches the power amplifier to battery voltage operation during the test. This preliminary action ensures that the reference voltage is stable and not affected by the booster's high-voltage operation, thereby maintaining both power capability and test accuracy.
3Device complexity
If the midpoint potential is used as the reference for short-circuiting determination, then the method is simple, but incorrect determination occurs when voltage levels change due to booster operation
Solution Approach 1:
The patent changes the reference parameter from the power amplifier's dynamic midpoint potential to the battery's stable midpoint potential. This maintains the simplicity of using a midpoint reference while eliminating the accuracy problems caused by voltage level changes during booster operation.
Data Source
AI summary
The present disclosure provides methods and devices for testing a connection between speakers and a power amplifier. The disclosed methods and devices solve a problem that, upon a connection test for a power amplifier which has a booster power source, when a midpoint potential of the power amplifier and the voltage of the speaker connection terminal are compared, and it is determined that short-circuiting occurs on a ground side when the potential of the speaker connection terminal is lower than the midpoint potential, a wrong test is conducted if a midpoint potential is higher than a battery voltage.