Method for determining withstand voltage value of boost capacitor of aero-engine ignition circuit

Abstract

The invention belongs to the technical field of aero-engine starting ignition, and relates to a method for determining the withstand voltage value of a boost capacitor of an aero-engine ignition circuit. The method comprises the following steps of S1, acquiring an inductance value L of a primary winding N1 in a first discharge circuit, a resistance value R of a current limiting resistor R1 and a capacitance value C of a capacitor C2; S2, enabling the first discharge circuit to be equivalent to a zero-input RLC damping oscillation circuit, determining a differential equation of the circuit, and determining a voltage UC0 of the capacitor C2 before breakdown and conduction of a discharge tube V; S3, solving the differential equation, and determining the voltage Uc on the capacitor C; and S4, determining the withstand voltage value of the capacitor C2 according to the derating coefficient. According to the method for determining the withstand voltage value of the boost capacitor of the aero-engine ignition circuit, the corresponding circuit can work reliably, the function and the performance meet the requirements, and the working state is safe and stable.

Description

technical field [0001] The present application belongs to the technical field of aero-engine starting and ignition, and in particular relates to a method for determining a pressure-resistant value of a boost capacitor of an aero-engine ignition circuit. Background technique [0002] The aero-engine starting ignition system consists of an ignition device, an ignition cable and an ignition nozzle, such as figure 1 shown. The working principle of the aero-engine starting ignition system: the ignition device converts the low-voltage electric energy provided by the engine power supply into high-voltage pulse electric energy, transmits it to the ignition nozzle through the ignition cable, and releases it instantly at the discharge end of the ignition nozzle to generate high-power discharge sparks. It is used to ignite the fuel and air mixture in the combustion chamber of the engine, and then start the engine. [0003] figure 2 The high-voltage discharge circuit with secondary ...

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Problems solved by technology

like figure 2 The rated working voltage of the capacitor C2 (hereinafter referred to as withstand voltage) is not marked, and it is selected by test or comparison method, not based on theoretical calculations. It is often selected relatively high, usually 8kV, and aviation products have constant requirements for weight and volume. This method is not conducive to the precise design of the product

[0009] There is no such calculation method for the withstand voltage of the capacitor in the secondary boost circuit

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