Trigger device and piezo-ignition coupler with galvanic decoupling

US4392074A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Peter Kleinschmidt · Munich, DE
• Valentin Magori · Gernsheim, DE

Key dates

• Filing date: Apr 9, 1981
• Grant date: Jul 5, 1983
• Expiry date: Apr 9, 2001

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/40
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A trigger device for electronic switches operating according to piezo-electric principles and having galvanic decoupling between the input control electronics and the controlled electronics switch has a piezo-ignition coupler which is a lamina of piezo-ceramic material having at least two spaced electrodes on one surface thereof and at least two counter electrodes in registry therewith on an opposite side thereof. The respective electrodes in registry form electrode pairs and one pair of electrodes is connected to the control electronics and another pair of electrodes is connected to the trigger electrode of the electronic switch. The lamina has a shape displaying an axis with more than two-fold rotational symmetry and the dimensions of the lamina are selected such that the frequency of an alternating signal supplied to the lamina is matched to the resonant frequency of the lamina at a value between 20 kHz and 500 kHz for inducing a mode of vibration according to the principle of radial oscillation.