The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 1982
Filed:
May. 21, 1980
Alfred Hauenstein, Munich, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
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.