Ignition device having power compensation function

Abstract

The invention relates to an ignition device having a power compensation function. The ignition device having the power compensation function comprises an energy conversion circuit, a transformer and an energy storage discharge circuit. The power compensation function is achieved through the energy conversion circuit which specifically comprises a pulse width modulator, an MOS transistor, a sampling resistor, a frequency adjusting capacitor and a frequency adjusting resistor. A pin 7 of the pulse width modulator is connected with the positive electrode of a power source and one end of a primary coil of the transformer. The other end of the primary coil of the transformer is connected with the drain electrode of the MOS transistor. The grid electrode of the MOS transistor is connected with a pin 6 of the pulse width modulator. A pin 3 of the pulse width modulator is connected between the source electrode of the MOS transistor and the sampling resistor. A pin 5 of the pulse width modulator is connected with the negative electrode of the power source. The frequency adjusting resistor is connected between a pin 4 and a pin 8 of the pulse width modulator in series. The frequency adjusting capacitor is connected between the pin 4 of the pulse width modulator and the ground. By the adoption of the ignition device, when the power supply voltage of the power source is reduced, power-on time is prolonged through a field effect transistor till the current reaches a set value so as to compensate for the power lost due to the voltage drop, and the spark frequency output by the ignition device is constant.

Description

technical field [0001] The invention relates to an ignition device for starting an aeroengine, in particular to an ignition device with power compensation function. Background technique [0002] Ignition devices are widely used in various fields such as engines, starters, and gas turbines to ignite the oil-gas mixture in the combustion chamber. Its ignition device is to pass low-voltage direct current into the primary coil of the transformer. When the current is cut off instantly, the electric energy will be coupled to the secondary coil of the transformer and boosted. Therefore, by periodically turning on and off the primary coil current, the required high-voltage pulse can be obtained in the secondary, which breaks down the air, forms an electric spark, and realizes the ignition function. [0003] The current ignition device is mainly divided into two types: contact type and self-excited oscillation circuit type. The contact mode is to use the magnetic force generated by...

AI Technical Summary

Problems solved by technology

However, when the power supply voltage of the ignition device decreases, the power of electric energy conversion will decrease accordingly, which directly leads to a decrease in the spark frequency output by the ignition device, which is not conducive to the ignition function. In severe cases, it may not be possible to ignite the fuel-air mixture.

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