Ignition Device Drive Circuit Mode Transition
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Solution Overview
Problem
Existing internal combustion engine ignition devices face challenges in transitioning from normal operation to protection modes like soft-off or current limiting without sharp changes in output signal levels, leading to increased costs due to the need for dedicated capacitive elements and load dependency.
Innovation Solution
The use of first and second differential circuits, each including a transistor, allows for a common drive current flow between modes, enabling a smooth transition by amplifying the difference between input signals and feeding back output signals to maintain consistent drive signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitive element is used to generate a soft-off waveform, then the switching element can be gradually transitioned from conductive to cut-off state, but the cost increases due to dedicated parts and load dependency
Solution Approach 1:
The patent combines the soft-off function with the existing drive circuit by using the same transistor for both normal ignition operation and soft-off operation. The drive circuit integrates both modes, eliminating the need for separate capacitive elements and reducing device complexity while maintaining the gradual transition capability that prevents unintended ignition.
Solution Approach 2:
The transistor in the drive circuit serves multiple functions: it acts as the switching element for normal ignition operation and simultaneously provides the gradual current reduction for soft-off operation. This multi-functional design eliminates the need for dedicated capacitive elements and reduces load dependency, resolving the contradiction between reliability and device complexity.
2Stability of the object's composition
If a capacitive element is used to generate a soft-off waveform, then the gate voltage can be stabilized, but load dependency increases and adjustment costs are required
Solution Approach 1:
The drive circuit uses feedback control to maintain stable gate voltage during mode transitions. The circuit monitors the switching element state and adjusts the drive signal accordingly, providing load-independent voltage stability without requiring capacitive elements or manual adjustments, thus resolving the contradiction between stability and adaptability.
Solution Approach 2:
The patent implements dynamic control of the gate voltage through the transistor's gradual transition capability. The drive circuit dynamically adjusts the current flow based on the operational mode, providing adaptive stability that is independent of load conditions, thereby eliminating the need for capacitive elements and reducing adjustment costs.
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 approach reduces the likelihood of unintended ignition and minimizes cost by avoiding sharp changes in output signal levels during mode transitions, optimizing the drive circuit's load capability and reducing the need for costly capacitive elements.
Implementation Method 1
each including a transistor and are configured such that a drive current for supplying the drive signal flows through the transistor which is common between the first mode and the second mode
Data Source
AI summary
Provided is an internal combustion engine ignition device capable of preventing an output signal level of a drive circuit from changing sharply when shifting from a normal ignition operation mode to a protection operation mode while reducing the cost of dedicated components and the like. An internal combustion engine ignition device of the present invention includes a first differential circuit for outputting a drive signal in a first mode and a second differential circuit for outputting a drive signal in a second mode, where the first differential circuit and the second differential circuit each include a transistor and are configured such that a drive current for supplying the drive signal flows through the transistor which is common between the first mode and the second mode.