Light sensitive zero voltage switch专利检索-零电压开关软开关变压器和转换设备专利检索查询-专利查询网

Light sensitive zero voltage switch

阅读：866发布：2021-06-09

专利汇可以提供Light sensitive zero voltage switch专利检索，专利查询，专利分析的服务。并且A system for heating and/or cooling utilizing a new two-wire thermostat and/or a zero voltage switch. Plural stages of heating and/or cooling may be provided with a single two-wire thermostat. That is, the sensor may be a dual automatic changeover thermostat. The heat control signal may be positive. The cool control signal may then be negative. Diodes are employed to pick the control signals by their polarities. The zero voltage switch inhibits firing of a triac unless the A.C. input voltage is near crossover. Three embodiments of zero voltage switches are disclosed. One provides pulsed current to limit the heat output of an electric heating element. Another provides, e.g., a two minute inhibit signal to prevent a cooling system compressor from being turned on immediately after it has been turned off. This is desirable to protect the cooling system from damage.，下面是Light sensitive zero voltage switch专利的具体信息内容。

权利要求

1. A light sensitive zero voltage switch comprising: a photosensitive silicon-controlled rectifier (SCR) having an anode, a cathode and a gate; a transistor having collector, emitter and base electrodes; a full wave bridge rectifier; and a triac having first and second sides; first and second output leads connected from said first and second triac sides, respectively, said bridge rectifier including first, second, third and fourth junctions and first, second, third and fourth diodes, said triac having a gate connected from said second side thereof to said first junction, said third junction being connected to said first output lead, said first diode being connected between said first and second junctions and poled to be conductive toward said second junction, said second diode being connected between said second and third junctions and poled to be conductive toward said second junction, said third diode being connected between said third and fourth junctions and poled to be conductive toward said third junction, said fourth diode being connected between said first and fourth junctions and poled to be conductive toward said first junction, said transistor collector and emitter electrodes being connected to said SCR gate and cathode, respectively, said SCR cathode being connected to said fourth junction, a fifth junction, said SCR anode being connected from said fifth junction, said second and fifth junctions being connected together; resistor means connected from said transistor base electrode to said fifth junction; capacitor means connected from said fourth junction to one of said transistor electrodes to inhibit firing of said SCR; sixth, seventh, eighth, ninth, tenth, eleventh and twelth junctions, said resistor means including a first resistor connected between said fifth and sixth junctions, a second resistor connected from said sixth junction to said transistor base electrode a thirteenth junction, a first capacitor connected between said eighth and thirteenth junctions, both of said twelth and thirteenth junctions being connected to said fourth junction, a third resistor connected between said sixth and eighth junctions a unijunction transistor having first and second bases and an emitter, said first and second bases being connected from said eighth and tenth junctions, respectively, a fourth resistor connected from said emitter to said fourth junction, a fifth resistor connected between said seventh and elevEnth junctions, said seventh junction being connected to said transistor base electrode, said tenth and eleventh junctions being connected together, a sixth resistor connected between said ninth and tenth junctions, said ninth junction being connected to said second junction, said capacitor means including a second capacitor connected between said eleventh and twelth junctions, said twelth and fourth junctions being connected together.

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Light sensitive zero voltage switch

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