| 摘要 |
<p>A condition responsive circuit, disclosed as including a temperature responsive element, is adapted to be connected by a pair of terminals to an alternating current load and to a source of alternating current voltage. The condition responsive circuit contains two different input impedances connected through a transistor to a differential amplifier to control a solid state switch, shown as a Triac. One of the input impedances is connected by a four-layer diode across the input of the condition responsive circuit and shorts the circuit out if the differential amplifier has not been energized to in turn operate the solid state power switching means, or Triac, prior to the voltage across the four-layer diode reaching its breakover potential. This arrangement allows for switching to a relatively high impedance within the condition responsive circuit to limit the dissipation except during the initial energizing portion of the applied waveform.</p> |
