초록 ▼

Electronic sensor on/off switch for a load connected to an a-c supply network, including a controlled semiconductor switch connected in a series circuit with the load, a sensor for switching the load on and off, a control circuit connected from the sensor to the switch, the switch being addressable

Electronic sensor on/off switch for a load connected to an a-c supply network, including a controlled semiconductor switch connected in a series circuit with the load, a sensor for switching the load on and off, a control circuit connected from the sensor to the switch, the switch being addressable by the control circuit in a conducting state with the load switched on by a signal holding the switch in the conducting state at the zero crossing of a current passing through the load, and in a non-conducting state with the load disconnected by signal switching the switch into the conducting state for switching on the load at the zero crossing of an output a-c voltage at the switch, a power supply circuit connected to the control circuit, a current transformer having a primary and a secondary winding and being operable in saturation, the current transformer being connected in series with the switch, the control circuit including a first rectifier being coupled to the secondary winding and having an output producing a supply voltage with the switch in the conducting state relative to a reference potential equal to a reference potential point of the output a-c voltage, and a branch of the series circuit including the primary winding, the switch, a storage capacitor chargeable by the output a-c voltage and a second rectifier producing the supply voltage in the non-conducting state.

대표청구항 ▼

Electronic sensor on/off switch for a load connected to an a-c supply network, comprising a controlled semiconductor switch connected in a series circuit with the load, a sensor for switching the load on and off, a control circuit connected from said sensor to said switch, said switch being addressa

Electronic sensor on/off switch for a load connected to an a-c supply network, comprising a controlled semiconductor switch connected in a series circuit with the load, a sensor for switching the load on and off, a control circuit connected from said sensor to said switch, said switch being addressable by said control circuit in a conducting state with the load switched on by a signal holding said switch in the conducting state at the zero crossing of a current passing through the load, and in a non-conducting state with the load disconnected by a signal switching said switch into the conducting state for switching on the load at the zero crossing of an output a-c voltage at said switch, a power supply circuit connected to said control circuit, a current transformer having a primary and a secondary winding and being operable in saturation, said current transformer being connected in series with said switch, said control circuit including a first rectifier being coupled to said secondary winding and having an output producing a supply voltage with said switch in the conducting state relative to a reference potential equal to a reference potential point of the output a-c voltage, and a branch of said series circuit including said primary winding, said switch, a storage capacitor chargeable by the output a-c voltage and a second rectifier producing the supply voltage in the non-conducting state.