Electronic switching device operating without contact

Abstract

Abstract An electronic switching device (1) operating without contact is represented and described, which comprises an oscillator (10) which can be influenced from the outside, a switched-mode amplifier (11), an electronic switch (12) which can be controlled by the oscillator (10) via the switched-mode amplifier (11), and a feed circuit (13) for generating the feed voltage for the oscillator (10) and for the switched-mode amplifier (11). In such switching devices (1), the oscillator (10) must start again after each damping action and the subsequent removal of the damping. The time needed by the oscillator (10) for coming from the non-oscillating state into the oscillating state, the starting time, is a criterion of the maximum switching frequency permitted by such a switching device (1). To reduce the starting time of the oscillator (10) in switching devices (1) of the type being discussed, a starting generator (14) is provided which generates a starting voltage containing the oscillating frequency, which voltage is coupled into the oscillator (10). According to the invention, a starting aid is thus provided to the oscillator (10) for the starting, which is immediately available in the form of the starting voltage immediately after each removal of the damping of the oscillator (10). <IMAGE>

Inventors

• 👤 Michael Burkhard Friedrich
• 👤 Ingo Sigurd Czech

Bibliographic Details