Ignition Semiconductor Circuit With Pulsed Self-Shutdown Current Control
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Solution Overview
Problem
Conventional semiconductor devices for internal combustion engine ignition systems experience oscillations in collector current during current control and self-shutdown operations, leading to erroneous ignition of the ignition plug.
Innovation Solution
A semiconductor device with a self-shutdown circuit that gradually decreases the main current using a capacitor in a pulsed mode, driven by a pulse generating circuit and timer circuit, to prevent oscillations and ensure accurate shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional current control circuit is used to shut down the main current, then the shutdown function is achieved, but oscillations occur in the collector current causing erroneous ignition
Solution Approach 1:
The patent applies periodic action by using a pulse generating circuit to create pulsed discharge signals that periodically charge and discharge a capacitor. This pulsed operation mode prevents continuous oscillations in the collector current during shutdown, thereby eliminating erroneous ignition while maintaining reliable current control functionality.
Solution Approach 2:
The patent introduces a capacitor as an intermediary element between the pulse generating circuit and the self shutdown circuit. This capacitor acts as a mediator that smooths out current transitions during shutdown by storing and releasing energy in controlled pulses, thereby suppressing harmful oscillations without affecting the overall shutdown function.
2Volume of moving object
If the device size is reduced, then integration is improved, but circuit functionality may be compromised
Solution Approach 1:
The patent merges multiple circuit functions into a single integrated device. The pulse generating circuit, capacitor, and self shutdown circuit are combined into one unified structure that performs both current control and oscillation suppression functions simultaneously. This integration achieves compact device size while maintaining complete functionality through functional consolidation.
Solution Approach 2:
The patent implements multi-functionality by designing a circuit where the pulse generating circuit serves dual purposes: it generates timing signals for control operations and simultaneously drives the capacitor to suppress oscillations during shutdown. This universal approach allows a single circuit element to perform multiple functions, reducing overall device complexity while maintaining shrinkability.
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 effectively suppresses oscillations in the collector current, preventing erroneous ignition and allowing for a smaller device size while maintaining accurate current control and self-shutdown functionality.
Implementation Method 1
a capacitor for setting a time to gradually decrease the main current through the output stage element, the capacitor being discharged in a pulsed mode
Data Source
AI summary
A semiconductor device for ignition performing a current control function and a self shut down function can include a pulse generating circuit, a switching circuit, and a current source circuit, the three circuits together generating a pulse current that discharges a capacitor in the self shut down process. This construction can serve to suppress oscillation of a collector current Ic of the output stage IGBT in the operating processes of the current control circuit and the self shut down circuit, thus preventing or minimizing the likelihood of the ignition plug from erroneous ignition. In addition, the discharge of the capacitor in a pulsed mode can allow for down-sizing of the capacitor, which can contribute to minimization of the semiconductor device.