Capacitor Discharge Circuit with Voltage-Threshold Control

The patent applies dynamics by making the discharge circuit state-variable rather than static. The discharge path is dynamically activated or deactivated based on the capacitor voltage level detected by the control circuit. When the capacitor is connected to the high-voltage source, the control circuit keeps the discharge transistor blocked, preventing continuous current consumption. When the capacitor is disconnected and voltage drops below the threshold, the discharge transistor activates to discharge the capacitor. This dynamic control resolves the contradiction between maintaining safety and avoiding continuous energy waste.

The control circuit is designed to be supplied with electrical power exclusively via the capacitor terminals, meaning it is self-activating based on the capacitor's voltage state. The control circuit automatically detects when the capacitor voltage drops below the threshold and activates the discharge circuit without requiring external mechanical elements or continuous power supply. This self-service mechanism ensures the discharge function is reliably activated only when needed, eliminating continuous current consumption while maintaining safety.

The patent replaces the mechanical conductor element with an electronic control circuit that detects capacitor voltage levels and controls the discharge transistor accordingly. Instead of using a mechanical switch or conductor that physically connects or disconnects based on power module status, the control circuit electronically monitors the capacitor terminals and activates the discharge path when voltage drops below the threshold. This substitution eliminates mechanical components from the high-voltage side, reducing complexity while maintaining reliable activation of the discharge circuit.

The control circuit is designed to be self-activating by monitoring the capacitor voltage directly at the terminals. When the capacitor is disconnected from the power supply and voltage drops below the predefined threshold, the control circuit automatically activates the discharge transistor without requiring external mechanical elements. This self-service mechanism simplifies the system by eliminating the need for mechanical conductors or switches while ensuring reliable discharge circuit activation based on the capacitor's actual voltage state.