Non-contact ignition control device surge protection
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Solution Overview
Problem
Existing non-contact ignition control devices for internal combustion engines face issues with static electricity causing surge currents that can lead to breakdown or malfunction of electronic components, particularly due to the need for high-voltage surge absorbing elements that increase device size and prevent cost reduction.
Innovation Solution
A configuration where the generation coil, trigger coil, and ignition control circuit are housed in a casing with the stop switch outside, using a low-voltage trigger coil to induce a voltage that allows a low-voltage, small-sized surge absorbing element to earth static electricity-derived surge currents, preventing them from reaching sensitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-voltage surge absorbing element is connected to the stop switch in parallel to protect against static electricity surge currents, then the reliability of electronic components is improved, but the device size increases and cost reduction becomes difficult
Solution Approach 1:
The patent changes the voltage parameter of the surge absorbing element from high-voltage to low-voltage by using a low-voltage trigger coil instead of the high-voltage generation coil. This parameter change allows the use of smaller, more compact surge absorbing elements while still effectively protecting against static electricity surge currents, thus resolving the contradiction between reliability improvement and device size reduction
Solution Approach 2:
The patent introduces a low-voltage trigger coil as an intermediary component between the stop switch and the surge absorbing element. This intermediary converts the high-voltage environment into a low-voltage environment, enabling the use of low-voltage surge absorbing elements that are smaller in size while still providing effective protection against surge currents
2Ease of operation
If the stop switch and wiring are installed outside the casing for manual operation, then the ease of operation is improved, but the risk of static electricity causing surge current intrusion into the ignition control circuit increases
Solution Approach 1:
The patent uses a low-voltage trigger coil as an intermediary component that isolates the external stop switch from the internal high-voltage ignition control circuit. The trigger coil converts external low-voltage operation signals into internal high-voltage ignition signals, while the surge absorbing element connected to the stop switch protects against static electricity intrusion, thus resolving the contradiction between ease of operation and protection against harmful factors
Solution Approach 2:
The patent replaces the direct electrical connection between the mechanical stop switch and the ignition control circuit with an electromagnetic induction system using the trigger coil. This substitution allows the stop switch to be operated manually outside the casing while preventing direct electrical intrusion of static electricity into the sensitive electronic components
3Volume of stationary object
If the generation coil, ignition control circuit and other components are molded into a resin casing for size reduction, then the volume of the device is reduced, but static electricity accumulated on the casing surface can jump to exposed terminals and cause breakdown
Solution Approach 1:
The patent applies prior cushioning by connecting a surge absorbing element in parallel with the stop switch before static electricity can cause damage. This protective measure is built into the circuit design beforehand, so when static electricity jumps to the exposed terminal, the surge absorbing element already in place absorbs the surge current and prevents breakdown of the ignition control circuit, thus resolving the contradiction between volume reduction and reliability maintenance
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
This solution effectively prevents surge current intrusion into the ignition control circuit, ensuring component reliability while using smaller, less expensive surge absorbing elements, thus reducing device size and maintaining operational safety.
Implementation Method 1
a trigger coil 2, and an ignition control circuit 52; wherein the trigger coil 2 induces a voltage
Implementation Method 2
the surge absorbing element absorbs the surge current derived from the static electricity
Data Source
Figure 1~2
Figure 3(a)~3(d)
Figure 4~5
AI summary
A non-contact ignition control device is configured to include a stop switch (20) that maintains a second switching element (18) in an OFF state so that a first switching element (12) is triggered by an induced voltage of a trigger coil (2) and short-circuits a generation coil (1), in which a surge absorbing element (21) is connected in parallel with the stop switch (20). Intrusion of a surge current into said ignition control circuit and the like based on static electricity accumulated on a casing surface covering electronic components and the like of the ignition control circuit is blocked, and breakdown of the electronic components and malfunction of the circuit caused by the surge current can be assuredly avoided.