Wide-input-voltage power supply converter

Abstract

The invention discloses a wide-input-voltage power supply converter, which has the advantages of ultra-wide voltage input range, high product reliability and high response speed. The wide-input-voltage power supply converter comprises a BOOST circuit (1), a DC (Direct-Current) / DC converter circuit (2), a BOOST control circuit (6), an IC (Integrated Circuit) power supply circuit (5) for supplying power to the BOOST control circuit (6), a voltage detecting circuit (3) with a power supply switching-off reference voltage, and a power supply switching-off circuit (4) for executing an operation of switching off the power supply circuit (5), wherein the voltage detecting circuit (3) is used for detecting a direct-current input voltage and outputs a logic level by comparing a detecting result with the power supply switching-off reference voltage, so that the power supply switching-off circuit (4) is driven to switch the power supply circuit (5) off or do not act.

Description

technical field [0001] The invention relates to a power converter, in particular to a power converter with an ultra-wide input voltage range. Background technique [0002] The technology of switching power supply has become increasingly mature and has been widely used. However, with the rapid development of new technologies, the development of switching power supplies still needs to keep up with the pace of new technologies. Today's new technologies require switching power supplies to have higher efficiency, smaller size, and wider input voltage range. What is counterproductive is that there is a contradiction between many new requirements in the face of old technologies in the past, such as wider input Voltage can bring problems such as efficiency and stability degradation to switching power supplies. The commonly used method in wide input voltage range technology is to use the frequency foldback method. This method is mostly used in single-stage circuit topology. In the f...

AI Technical Summary

Problems solved by technology

In the actual design, there will be such a problem: the loss of the power supply circuit is small at high voltage input, and the startup time at low voltage input is very long

The common method is to convert the driving signal in the first or second stage circuit into a level signal or auxiliary power supply to turn off the power supply circuit, so as to solve the problem of response speed, but it also introduces the problem of reliability : When the output of the converter is abnormal, such as the first stage is turned off or the second stage is short-circuited, the output is overvoltage and other abnormalities, the auxiliary winding and the driving signal will no longer have enough voltage to drive the IC shutdown circuit to operate, and the power supply The circuit will fail, which is extremely dangerous for the power supply circuit, especially when the converter is input with high voltage, it is very easy to burn the power supply circuit

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