Direct-current boosting circuit and integrated circuit thereof

Abstract

The invention discloses a direct-current boosting circuit. The direct-current boosting circuit comprises a zero-cross detection circuit, an over-current detection circuit, a triggering logical circuit and a power switch, wherein the zero-cross detection circuit is used for detecting whether the voltage of the secondary side of the transformer crosses zero or not, and outputting a result to the triggering logical circuit; the over-current detection circuit is used for detecting whether the current of the primary side of the transformer surpasses a set value or not, and outputting a result to the logical triggering circuit; the logical triggering circuit is used for performing logical operation on the output results of the zero-cross detection circuit and the over-current detection circuit to determine the state of a power switch and drive the power switch, so that the aims of safety, reliability and high interference resistance are fulfilled.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a DC boost circuit and an integrated circuit thereof. Background technique [0002] At present, the function of the capacitive energy storage type electronic igniter is to generate an electric spark to ignite the mixed gas in the cylinder to make the engine work. Capacitive energy storage electronic igniters are widely used in motorcycles, gasoline generators and other equipment. The capacitor energy storage type electronic igniter is composed of a DC booster, an energy storage capacitor, a thyristor and a thyristor trigger circuit. The existing DC booster consists of three parts: oscillator, transformer and rectifier. [0003] The operating frequency of the existing DC booster is determined by the oscillator. In order to reduce the size of the transformer and improve reliability, it is usually necessary to ensure that it works in a discontinuous mode. Since the time from th...

AI Technical Summary

Problems solved by technology

However, at high voltage, after the transformer energy output is completed, it still needs to wait for the off-time to pass before entering the next cycle, resulting in a slow charging speed. To compensate for the charging speed, only the primary current can be increased, and the size of the transformer will also increase accordingly. , leading to a large volume of the igniter

At the same time, LC resonance will appear after the transformer output is completed, resulting in energy waste and electromagnetic interference

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