Discharge Control Device Ignition Switch Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional discharge control systems fail to immediately stop the discharge operation when the ignition switch is turned back on after being turned off, leading to prolonged standby times for restarting a vehicle system.
Innovation Solution
A discharge control device with a switch and resistor in the discharge circuit, utilizing a flip-flop circuit, reset circuit, and differentiation circuit to control the discharge state based on ignition switch changes, allowing for immediate cancellation of discharge when the switch is turned back on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge circuit uses a contactor as a switch and maintains it in the ON state for a predetermined period to discharge the smoothing capacitor, then the discharge operation continues to consume accumulated charge, but the discharge operation cannot be immediately stopped when the ignition switch is turned back on during the discharge period, leading to prolonged system restart time
Solution Approach 1:
The patent applies the dynamics principle by making the discharge circuit's switch state changeable based on ignition switch status. The control circuit dynamically adjusts the discharge circuit from a fixed predetermined-time discharge mode to a flexible mode where the switch can be immediately turned off when the ignition switch is activated during the discharge period, resolving the contradiction between completing discharge operation and enabling quick system restart
Solution Approach 2:
The patent implements feedback by having the control circuit continuously monitor the ignition switch state during the discharge period. When the ignition switch is detected to be in the ON state, the control circuit provides feedback signal to immediately turn off the discharge circuit switch, allowing the system to respond to changing conditions and prioritize quick restart when needed
Data Source
AI summary
A discharge control device includes a discharge circuit configured to include a switch and a resistor to discharge charges of a smoothing capacitor and a power converter which are connected to a high-voltage power supply. The discharge circuit sets the switch to an ON state to start the discharging for a fixed period when an ignition switch is changed from the ON state to an OFF state. The discharge circuit sets the switch to the OFF state to stop the discharging when the ignition switch is changed from the OFF state to the ON state during a period in which the discharge circuit performs the discharging.