Warning Light Control Circuit With Start-Up Flash Prevention
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Solution Overview
Problem
Existing warning light systems suffer from uncoordinated flashing, increased manufacturing costs due to electronic control devices, and potential detection by criminals during police operations due to poor circuit design causing start-up flashing.
Innovation Solution
A warning light control circuit incorporating a signal processor, control circuit, and warning light control IC, with a start-up flash prevention circuit using an active switch, current limiter, and shunt resistors to block the starting pulse wave, allowing coordinated flashing and stealth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electronic control device is added to control multiple warning lights, then the warning lights can be controlled to flash in coordination, but the manufacturing cost and terminal sales price increase
Solution Approach 1:
The patent merges the control functions into the warning light control IC itself, eliminating the need for a separate electronic control device. The IC integrates the flash mode selection, coordination control, and light driving functions in a single component, reducing system complexity while maintaining coordinated flashing capability.
Solution Approach 2:
The warning light control IC performs multiple functions including flash mode selection, coordination control, and light driving control within a single device. This multi-functional approach replaces what would traditionally require separate control devices, reducing overall system complexity.
2Ease of operation
If the warning light control circuit is designed with traditional circuit architecture, then the light device can be turned on normally, but the starting pulse wave causes the warning lights to flash unintentionally
Solution Approach 1:
The patent applies preliminary anti-action by blocking the starting pulse wave before it can cause unintentional flashing. The current limiter and shunt resistors are configured to prevent the harmful effect (unintentional flashing) from occurring in the first place during the start-up phase, rather than correcting it after it occurs.
Solution Approach 2:
The patent introduces intermediary components (current limiter and shunt resistors) between the power supply and the warning light control IC. These intermediary elements modify the starting pulse wave to prevent it from causing unintentional flashing, while allowing normal operation to proceed correctly after initialization.
3Reliability
If the warning lights flash at start-up, then the light device activates normally, but criminals may detect and escape, reducing operational stealth
Solution Approach 1:
The patent prevents the harmful effect (criminal detection) by blocking the starting pulse wave that would cause visible flashing at start-up. The current limiter and shunt resistors ensure that no unintentional flashing occurs during initialization, maintaining operational stealth while still allowing reliable light device activation after the harmful effect is prevented.
Data Source
AI summary
A warning light control circuit capable of preventing start-up flashing, which has a start-up flash prevention circuit including active switch, current limiter, first shunt resistor and second shunt resistor set between warning light control IC and Data Bus. The active switch has the gate coupled between first and second shunt resistors, the source coupled to ground point and the drain coupled to the positive terminal of current limiter. The other end of first shunt resistor is coupled to Input Voltage Source. The other end of second shunt resistor is coupled to ground point. The negative terminal of current limiter is coupled to Data Bus. When the warning light control circuit starts to turn on, the starting pulse wave of Data Bus is blocked by current limiter to prevent warning light control IC from being turned on instantaneously.