초록 ▼

An A.C. solid state power controller for controlling the current through a load from an alternating current source, including a diode bridge rectifier with its direct current output connected to a solid state switch, such as a MOSFET or a bipolar transistor, that is gate controlled by gate signals s

An A.C. solid state power controller for controlling the current through a load from an alternating current source, including a diode bridge rectifier with its direct current output connected to a solid state switch, such as a MOSFET or a bipolar transistor, that is gate controlled by gate signals synchronized to the A.C. source. The gate signals are provided from an optocoupler to control the solid state switch and the load current. Overload, short circuit, and low A.C. line voltage conditions are sensed by protection circuits which signal the optocoupler to turn off the solid state switch and, thus, the load current. A fast turn off time, in the range of a few microseconds, is achieved which, together with the rectifier and solid state switch configuration, provides a power controller which is resistant to short circuit and overload destruction present in conventional A.C. solid state circuit breakers and power control devices.

대표청구항 ▼

An A.C. solid state power controller for controlling current through a load from an alternating current source connected to said load, comprising: a rectifier bridge having alternating current input terminals connected to said load and said alternating current source such that said rectifier bridge,

An A.C. solid state power controller for controlling current through a load from an alternating current source connected to said load, comprising: a rectifier bridge having alternating current input terminals connected to said load and said alternating current source such that said rectifier bridge, said load and said alternating current source are connected to provide a load current path therethrough, said rectifier bridge including direct current output terminals; solid state switch means connected between said direct current output terminals of said rectifier bridge including a D.C turn on and turn off control gate for turning on and turning off said solid state switch means and permitting current flow therethrough and thereby permitting said current from said alternating current source to flow in said load current path through said load, said solid state switch means being directly turned off by said control gate to thereby prevent said load current path through said rectifier bridge and said load; gate signal generating means, synchronized to said alternating current source, for providing a gate signal to said control gate for operating said solid state switch means for turn on or turn off thereof; and circuit protection means, responsive to said current through said load, for providing, independent of the value of line voltage of said alternating current source, a turn off signal to said gate signal generating means whereby said solid state switch means is opened to thereby prevent said load current path through said rectifier bridge and said load and turn off said load current.