A device for controlling alternating current and direct current conversion

Abstract

An embodiment of the present invention provides a device for controlling AC / DC conversion, including a rectification circuit, a detection circuit, and a logic circuit, wherein: the detection circuit includes a voltage divider module, a first comparator module, and a second comparator module; the voltage divider module The first input terminal, the second input terminal and the third input terminal are respectively connected to the first AC input terminal, the second AC input terminal and the DC output terminal of the rectifier circuit; the input terminal of the first comparator module is connected to the output of the voltage divider module The output terminal of the first comparator module is connected with the first input terminal of the logic circuit; the input terminal of the second comparator module is connected with the output terminal of the voltage divider module, and the output terminal of the second comparator module is connected with the output terminal of the logic circuit The second input end is connected; the output end of the logic circuit is connected with the control end of the rectification circuit. By adopting the invention, the rectification of the rectification circuit can be accurately controlled by accurately controlling the cut-off of the MOS tube, and it is not easy to cause the error of controlling the AC and DC conversion under the condition of the comparator being out of adjustment.

Description

technical field [0001] The present invention relates to the field of electronic technology, and in particular, to a device for controlling AC / DC power conversion. Background technique [0002] In the commonly used rectifier equipment, a bridge rectifier composed of four Schottky diodes is usually used to realize the conversion of AC and DC power. However, with the increase of power efficiency requirements and the increasing restrictions on external space, Schottky diodes are gradually replaced by N-type MOS transistors and placed inside the chip to reduce the space occupied. [0003] In the prior art, the switch that controls the MOS tube is composed of a comparator module, which includes three comparators, which respectively compare any two of the first AC input end, the second AC input end and the DC output end of the rectifier circuit. The voltage between them is used to control the switches of the four MOS tubes. However, since only one MOS transistor is set between th...

AI Technical Summary

Problems solved by technology

However, since only one MOS transistor is arranged between the first AC input terminal, the second AC input terminal and the DC output terminal, the voltage value of the DC output terminal is only one difference from the voltage value of the first AC input terminal and the second AC input terminal. The voltage drop of the MOS tube, so their voltage values ​​are relatively close, and the accuracy requirements for the comparator are relatively high, and when the comparator is out of adjustment, it is easy to cause misjudgment, affect the normal function of controlling the MOS tube switch, and it is easy to It causes leakage from the DC output terminal to the first AC input terminal and the second AC input terminal, which eventually leads to poor chip consistency and affects the yield rate of chip mass production

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