Topic
Relaxation oscillator
About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.
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Patent•
02 Aug 1977
TL;DR: In this paper, a relaxation oscillator circuit is used to charge a capacitor of a thyristor by a s source voltage of a reference voltage and a variable voltage, providing the variable voltage source in parts which are affected by a load current, and suppress the load current variation.
Abstract: PURPOSE:To charge a capacitor of a relaxation oscillator circuit controlling a thyristor by a s source voltage of a reference voltage and a variable voltage, provide the variable voltage source in parts which are affected by a load current, and suppress the load current variation.
1 citations
07 Jun 2000
TL;DR: In this paper, a technique based on the gyrator transformation is presented to set up the nonlinear equation network in a form suitable to be solved with analytical methods, and a symbolic program based on this technique is applied to compute the exact expression of the steady state frequency and amplitude of the Van der Pol oscillator and the Colpitts oscillator.
Abstract: The calculation of the oscillation condition is one of the main points of oscillator analysis. Its determination in finite terms allows one to calculate the steady state amplitude and frequency of the oscillator. Symbolic solutions provide an additional insight into the behavior of the circuit. As an example the sensitivity of the oscillator to parameter change can be expressed in an exact form. Numerical solutions are not as helpful as symbolic solutions in the design stage. We present a technique, based on the gyrator transformation, to set up the nonlinear equation network in a form suitable to be solved with analytical methods. We develop a symbolic program based on this technique. As an example, the symbolic program is applied to compute the exact expression of the steady state frequency and amplitude of the Van der Pol oscillator and the Colpitts oscillator.
1 citations
TL;DR: In this article, performance data for unijunction transistor devices and their applications as oscillator circuits operate at normal and elevated temperature levels (up to 140°C) as well as in nuclear radiation environments ( up to 1000 Mrad) are presented either experimentally or theoretically.
1 citations
Patent•
18 Mar 1976
TL;DR: In this article, a relaxation oscillator is used for illuminated letters, where a constant intensity is required, and a current discriminator detects when a particular current in the transistor has been attained and then forces it into the cut off condition.
Abstract: The current supply is used for illuminated letters, where a constant intensity is required. The circuit consists of a relaxation oscillator, containing a transistor (1), a transformer (4, 5, 10) a timing circuit and a current discriminator. The transistor in the oscillator switches repeatedly from fully conducting to fully cut off and vice versa, with the lengths of time in either state defined by the discriminator and timing circuit respectively. The discriminator detects when a particular current in the transistor has been attained and then forces it into the cut off condition. This defines the current in the transformer secondary circuit (10) which in turn feeds the gas discharge lamp (11) or lamps.
1 citations
Patent•
17 Dec 1970
TL;DR: In this paper, a negative resistance circuit such as a pulse-forming or relaxation oscillator circuit employing a unijunction transistor as the negative resistance element was adapted for firing an SCR or the like.
Abstract: A negative resistance circuit such as a pulse-forming or relaxation oscillator circuit employing a unijunction transistor as the negative resistance element and adapted for firing an SCR or the like. The tendency of the negative resistance element to fail to recover to non-conducting condition after it has been triggered into conduction, due to a low valley current characteristic, is overcome by an improved recovery circuit that uses the interbase current to reduce the input current.
1 citations