Abstract: The present invention is a solid state relay having improved high speed turn on and lower heat dissipation of the power transistor. It uses a voltage level converter and AC-DC converter to provide a control input to an isolation transformer primary. The secondary of the isolation transformer is rectified and charges capacitors having capacitance much higher than that of control input of the power transistor. Transistors are coupled to a controller and the capacitors. The transistors are controlled by the controller to provide for the charging of the capacitors and later transferring of voltage from the capacitors into the capacitance of the control input of the power transistor so that it is charged quickly and turns on quickly. Similar operation occurs for quickly turning off the power transistor.

Abstract: The present invention is a solid state relay having improved high speed turn on and lower heat dissipation of the power transistor. It uses a voltage level converter and AC-DC converter to provide a control input to an isolation transformer primary. The secondary of the isolation transformer is rectified and charges capacitors having capacitance much higher than that of control input of the power transistor. Transistors are coupled to a controller and the capacitors. The transistors are controlled by the controller to provide for the charging of the capacitors and later transferring of voltage from the capacitors into the capacitance of the control input of the power transistor so that it is charged quickly and turns on quickly. Similar operation occurs for quickly turning off the power transistor.