![]() Read moreĪ single-chip class-E converter was developed for fluorescent lampīallasts. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The same flame sensor enables a thermopile driven main valve actuating circuit. Once the flame is sensed, further sparks are precluded. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. Read moreĪn electronic ignition system for a gas burner is battery operated. The accuracy varied between Â☐.020% and about Â☑%, depending upon the frequency and the standards used. Tests have been made over a wide range of resistance, inductance and capacitance, with frequencies varying between 1000 c/s and 50 Mc/s. Furthermore, by means of measurement with an additional standard in the circuit, the angular frequency can be made to disappear from the balance equations. The circuit therefore has a multiplying ratio, or ratio arms, and thus has a much wider range of measurement for a given set of standards. The balance condition depends, therefore, not only upon the values of the impedances in the circuit, but also upon the values of the components of the voltage divider. In this manner the voltages of the shunt and the T-circuit are made different, although they are. The shunt is connected across the source, whilst the T-circuit is connected across the lower-voltage part of the voltage divider. The paper describes a shunted-T circuit provided with a voltage divider, consisting of two resistors or two capacitors, at the input, connected in series across the source.
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