Vehicle Direction Indicator Circuit Capacitor Timing
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Solution Overview
Problem
Existing direction indicator circuits in vehicles face challenges with robustness and reliability due to exposure to harsh environmental conditions such as temperature, humidity, soiling, and electromagnetic emissions, and they often generate additional stress that increases operational costs.
Innovation Solution
A simple semiconductor direction indicator circuit with three terminals, one for supply voltage, one for a lighting means and a direction indicator switch, and one for a capacitor, which acts as a boot strap and oscillator, allowing for controlled charging and discharging to determine the frequency of the indicator, reducing electromagnetic emissions and maintaining operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an electronic direction indicator circuit is used to replace electromechanical solutions, then cost is reduced, but robustness and reliability under harsh environmental conditions deteriorate
Solution Approach 1:
The patent changes the operating parameters of the electronic circuit by using a capacitor to control the flash duration and frequency, ensuring the circuit operates within optimal ranges that balance cost-effectiveness with reliability under harsh conditions including temperature extremes and humidity
Solution Approach 2:
The circuit incorporates feedback mechanisms where the capacitor's charging and discharging states provide feedback control for the switching elements, enabling stable and reliable operation of the direction indicator across varying environmental conditions while maintaining cost efficiency
2Speed
If the direction indicator circuit generates high electromagnetic emissions, then switching speed and response time improve, but additional stress is generated requiring expensive filters and increasing operational costs
Solution Approach 1:
The patent employs periodic charging and discharging of the capacitor to create controlled periodic switching actions that achieve the required flash frequency while limiting electromagnetic emissions to acceptable levels, avoiding the need for expensive filtering components
Solution Approach 2:
The capacitor acts as an intermediary element that mediates between the power supply and the lighting means, smoothing current transitions and reducing electromagnetic emissions while maintaining adequate switching speed for reliable direction indication
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 provides a cost-effective and robust direction indicator circuit with low electromagnetic emissions, ensuring reliable operation across varying conditions and reducing the need for additional stress-minimizing designs, thereby lowering user costs.
Implementation Method 1
a third terminal for connecting to a capacitor; wherein the direction indicator circuit is configured to provide the direction indicator with a current during an on state and with no current during an off state, wherein the duration of the on state and the duration of the off state are determined by the size of the capacitor; wherein the capacitor is discharged essentially constantly during the on state, and wherein the capacitor is charged essentially constantly during the off state
Data Source
AI summary
A direction indicator circuit for controlling a direction indicator in a vehicle is provided. The direction indicator circuit may include a first terminal for connecting to a supply voltage terminal; a second terminal for connecting to a lighting means of a direction indicator and to a direction indicator switch; and a third terminal for connecting to a capacitor; wherein the direction indicator circuit is configured to provide the direction indicator with a current during an on state and with no current during an off state, wherein the duration of the on state and the duration of the off state are determined by the size of the capacitor; wherein the capacitor is discharged essentially constantly during the on state, and wherein the capacitor is charged essentially constantly during the off state.