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A zero-crossing detection module for dc/dc

A zero-crossing detection and judgment module technology, which is applied in the direction of measuring devices, measuring electrical variables, control/regulation systems, etc., can solve problems such as inductive current backflow, and achieve the effect of preventing backflow phenomena

Inactive Publication Date: 2017-07-14
ZUNYI NORMAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a DC / DC zero-crossing detection module, which controls the inductor current by controlling the switching off and on of the switching tube, and solves the problem of Solve the problem of inductive current reverse flow

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  • A zero-crossing detection module for dc/dc
  • A zero-crossing detection module for dc/dc
  • A zero-crossing detection module for dc/dc

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Embodiment Construction

[0019] The technical solution of the present invention is further described below, but the scope of protection is not limited to the description.

[0020] Such as Figure 1 ~ Figure 3 A zero-crossing detection module for DC / DC is shown, including a zero-crossing comparator module 1, a working mode judgment module 2, a false shutdown prevention module 3, a backflow prevention module 4 and a compromise calculation module 5; The signal input terminal of the zero-crossing comparator module 1 is connected with the LX terminal and the analog ground terminal VSSS respectively, and the signal output terminal of the zero-crossing comparator module 1 is connected with the signal of the working mode judgment module 2 and the false shutdown prevention module 3 respectively. The input terminal is connected, the signal input terminal of the anti-backflow module 4 is connected with the signal output terminal of the wrong shutdown prevention module 3, the signal output terminal of the wrong s...

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Abstract

The invention provides a zero-cross detection module for DC / DC (Direct Current / Direct Current). The module comprises a zero-cross comparator module, a working mode judgment module, an incorrect turn-off prevention module, a reverse current prevention module and a compromise operation module. Inductive current is controlled by controlling turn-off and the turn-on of a switch tube; detection is performed when the inductive current is zero, including detecting the voltage of an LX node and judging whether the working mode of a Buck circuit is a non-continuous conduction mode or a continuous conduction mode, so that incorrect turn-off which is probably caused by over-slow LX voltage discharge due to over-large capacitance of the LX node is prevented, and a reverse current phenomenon produced by the inductive current can be prevented by the peripheral logic of the zero-cross detection.

Description

technical field [0001] The invention relates to the technical field of circuit structures, in particular to a DC / DC zero-crossing detection module. Background technique [0002] In the increasingly updated portable electronic products, with the rapid development and continuous innovation of integrated circuit technology, electronic technology and communication technology, a huge number of portable devices have penetrated into our lives, such as smart phones, mobile players (MP3), digital Cameras, digital video cameras, portable notebooks, and more. Advanced and portable equipment has greatly improved our quality of life and facilitated my current life. Most of them are powered by batteries. The limited battery capacity and the rapid expansion of product functions put forward higher and higher requirements for the efficiency of power management, and the integrated synchronous BUCK DC-DC converter can maintain a wide range of input voltages. High efficiency makes it the pref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00
CPCG01R19/175
Inventor 杨洁
Owner ZUNYI NORMAL COLLEGE
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