TRIAC Power Control Device with Relay Bypass

The patent applies preliminary action by disconnecting the TRIAC from the mains voltage before activating the mechanical switch for full power operation. The control circuit detects when full power is required and opens the TRIAC circuit first, then closes the mechanical switch. This sequence ensures the TRIAC is not present in the circuit when the mechanical switch bounces, preventing the bouncing-induced high current density from destroying the TRIAC while still achieving low power loss through the mechanical switch bypass

The patent applies dynamics by dynamically switching between two operational modes: phase control mode where the TRIAC regulates power to the motor, and full power mode where a mechanical switch bypasses the TRIAC. The control circuit monitors the power control setting and automatically transitions between modes, keeping the TRIAC out of the circuit when full power is required. This dynamic switching eliminates continuous power dissipation in the TRIAC while maintaining full power control functionality when needed

The patent applies preliminary action by implementing a controlled switching sequence where the TRIAC is disconnected from the mains voltage before the mechanical switch is activated. The control circuit generates control signals that first open the TRIAC circuit, wait for a brief period to ensure complete disconnection, then close the mechanical switch. This preliminary disconnection action protects the TRIAC from the harmful effects of mechanical switch bouncing while maintaining relatively simple circuit architecture through the use of a control circuit that coordinates the switching sequence