Lamp Control Circuit for Leakage Current Suppression
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Solution Overview
Problem
Existing lamp control devices for motorcycles fail to accurately suppress unintended lighting due to leakage currents and do not effectively reduce power loss associated with such currents.
Innovation Solution
A lamp control device with a controller that alternates between control modes based on voltage thresholds, utilizing a constant current circuit and voltage monitor to manage the internal switch and minimize power consumption, while a comparator and setter circuit adjust voltages to accurately detect and prevent leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resistor is connected in parallel with a lamp to reduce measurement error, then measurement precision is improved, but power loss due to leakage current increases
Solution Approach 1:
The patent applies periodic action by alternately switching between a first control mode (where the internal switch is off and the constant current circuit operates) and a second control mode (where the internal switch is on and the constant current circuit is stopped). This periodic switching allows the system to measure resistance accurately during the first mode while minimizing power loss during the second mode, thereby resolving the contradiction between measurement precision and energy loss.
2Device complexity
If the threshold voltage of the digital transistor and Zener voltage of the Zener diode are used for leakage current detection, then device complexity is reduced, but measurement precision deteriorates due to voltage variation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reference voltage level used for leakage current detection. Instead of using fixed threshold voltage or Zener voltage, the system varies the reference voltage adaptively to compensate for component variations, thereby maintaining high measurement precision without significantly increasing device complexity.
3Measurement precision
If the constant current circuit operates continuously to ensure accurate current monitoring, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by stopping the constant current circuit during the second control mode when the internal switch is on, and only operating it during the first control mode when measurement is required. This periodic operation ensures accurate current monitoring is performed only when necessary, significantly reducing overall power consumption while maintaining measurement precision.
Data Source
AI summary
A lamp control device comprises a first input terminal, a second input terminal, an output terminal that is configured to be connectable to a lamp via an external switch and outputs a drive current for the lamp, an internal switch provided on a first path connecting the first input terminal and the output terminal, a constant current section provided on a second path connecting the second input terminal and the output terminal, a voltage monitoring section that monitors a voltage applied to the output terminal, and a control section that controls the internal switch on the basis of a monitoring result from the voltage monitoring section.