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At least one electronic voltage-dependent coupling element coupling said load to said oscillator that exhibits relatively high impedance at relatively low voltages and relatively low impedance at relatively higher voltages, said voltage-dependent coupling element comprising two Zener diodes connected back-to-back and in series such that for each polarity of voltage of said oscillator said voltage-dependent coupling element prevents current flow at voltages below breakdown voltages of said Zener diodes. BACKGROUND OF THE INVENTION The present invention is directed to oscillators. More particularly, the invention is directed to an oscillator having an electrical load coupled thereto. Oscillators having an electrical load coupled thereto are described in a book by Otto Limann, 'Elektronik ohne Ballast,' Franzis-Verlag GmbH, 1978, at pages 147-151. At pages 162, 163, and 175 of the book, a voltage multiplier circuit in a high-voltage supply for an x-ray image intensifier is described. This multiplier circuit is an example of an electrical load that can be coupled to an oscillator. Often, the starting phase in an oscillator, or resonant circuit, is more critical than the steady state phase, i.e., maintenance of oscillation, once the oscillator has been started.

This is particularly true when circuit loading by the electrical load is greater during the start up phase than during steady state phase. In this situation, the oscillator can start up poorly or not at all. A situation where the oscillator starts up poorly can occur when a voltage multiplier circuit is coupled as an electrical load to the oscillator. The current required for charging capacitors of the high-voltage cascades of the voltage multiplier circuit is drawn away from the oscillator during the start up and stimulation phase. As a result, a reliable and fast stimulation of oscillations is not guaranteed.

SUMMARY OF THE INVENTION The present invention provides an oscillator that easily starts-up and stimulates oscillations even when an electrical load is coupled thereto. To this end, the invention provides that a load is coupled to an oscillator via at least one voltage-dependent coupling element that reduces or precludes current drain from the oscillator to the load until the voltage of an output of the oscillator is sufficiently great. In an embodiment, the invention provides that an electrical load be coupled to an oscillator via at least one voltage-dependent impedance element that exhibits high impedance at low voltages and low impedance at high voltages. As a result, load current cannot flow until the oscillator has started. In an embodiment, the voltage-dependent coupling element used to couple the load to the resonant circuit of the oscillator comprises two Zener diodes connected in series and with the anodes thereof coupled together. For example, given an x-ray image intensifier voltage supply, the Zener diodes can be connected in series between the high voltage cascade of the high voltage multiplier of the supply and the oscillator. Since the anodes of the Zener diodes are coupled together, the cathode of one diode is coupled to the oscillator while the cathode of the other diode is coupled to the voltage multiplier.