Patent ID: 9006992
Filing Date: 2015-04-14
Classification: H02M,H03K,H05B,Y02B

Abstract:
1. An apparatus for controlling power to a load, the apparatus comprising: a thyristor; a secondary load switchably connected to an output of the thyristor; and a sensor connected to the secondary load, wherein the sensor is adapted to connect the secondary load to the thyristor when the output of the thyristor falls below a predetermined level, wherein the secondary load is switchably connected to the thyristor output by a transistor, wherein the sensor comprises: a resistor connected between the thyristor output and a control input of the transistor, and a second resistor connected between the control input of the transistor and a low voltage reference node; a Zener diode connected to the control input of the transistor; a second transistor having an input connected to the control input of the transistor; a third resistor connected between the thyristor output and a control input of the second transistor, and a fourth resistor connected between the control input of the second transistor and the low voltage reference node; and a second Zener diode connected to the control input of the second transistor.