Wide-range input direct-current rectification filter circuit

Abstract

A wide-range input direct-current rectification filter circuit comprises an over-current protection circuit, an overvoltage protection circuit, a filter circuit, a voltage reducing circuit, a voltage boosting circuit and an output circuit, wherein an output end of the over-current protection circuit is connected with an input end of the overvoltage protection circuit, an output end of the overvoltage protection circuit is connected with an input end of the filter circuit, an output end of the filter circuit is connected with an input end of the voltage reducing circuit, an output end of the voltage reducing circuit is connected with an input end of the voltage boosting circuit, an input end of the output circuit and a feedback input end of the voltage reducing circuit are connected with an output end of the voltage boosting circuit. The voltage reducing circuit and the voltage boosting circuit are automatically started according to the size of the input voltage, the variance range of the input power source is wide, the self power consumption of the power device is small, the work efficiency is high, the circuit work mode is simple, the perimeter device is less and the reliability is high.

Description

technical field [0001] The invention relates to a DC rectification filter circuit with wide-range input, specifically a wide-range input, high reliability, and low loss DC buck-boost circuit specially used for 24V storage batteries, and belongs to the technical field of rectification in electrotechnical technology. Background technique [0002] Diesel engines are usually equipped with a 24V rechargeable battery. When the engine is running, its alternator needs to charge the battery for use by other equipment. Due to the diversity and importance of DC loads and the power consumption process The instability of the load current makes the adaptability of the DC power supply very important. For example, in a car powered by a diesel engine, the electronic control devices on the car need a stable and reliable power supply, otherwise it will be detrimental to the safety of the vehicle. Smooth operation, and even greatly shorten the service life of related equipment in the system, so...

AI Technical Summary

Problems solved by technology

[0002] Diesel engines are usually equipped with a 24V rechargeable battery. When the engine is running, its alternator needs to charge the battery for use by other equipment. Due to the diversity and importance of DC loads and the power consumption process The instability of the load current makes the adaptability of the DC power supply very important. For example, in a car powered by a diesel engine, the electronic control devices on the car need a stable and reliable power supply, otherwise it will be detrimental to the safety of the vehicle. Smooth operation, and even greatly shorten the service life of related equipment in the system, so a switching power supply circuit with simple structure, high efficiency and easy implementation becomes a necessary device

Chinese invention patent "A self-excited switching power supply" (application number: 200720188553.X application date: 2007-12-19), using a voltage comparison circuit and an energy storage filter circuit, so that the input and output voltage fluctuations are relatively small Large, even when the battery is disconnected, the output voltage can be kept stable, suitable for motorcycles and cars of various displacements. The disadvantage is that this circuit is actually only suitable for use on motorcycles. There is no integrated module, and more independent components are used. When mass-produced, the consistency of the product is poor, and its yield is bound to be low.

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