Zero-cross detection circuit

A zero-crossing detection circuit and sampling circuit technology, applied in the direction of measuring electrical variables, measuring current/voltage, emergency protection circuit devices, etc., can solve the problems of low discrimination sensitivity and poor stability, and achieve high application value and reduce short life. , improve the effect of gain

Inactive Publication Date: 2016-03-16
WUHU RUIXIN ELECTRONICS TECH CO LTD
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  • Abstract
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Problems solved by technology

At present, the DC / DC zero-crossing detection circuit has the problems of poor stability and low discrimination sensitivity.

Method used

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Embodiment

[0016] A zero-crossing detection circuit, the drive circuit includes a sampling module, a rectification module, a comparison module and a protection module, the sampling module is connected to the rectification module, and the sampling module is a sampling circuit formed between pressure-resistant tubes, through sampling The circuit samples and detects the voltage at the drain end of the synchronous rectifier. The rectification module converts the voltage detected by the sampling module into a current signal. The current comparator detects the rectified current and judges whether the circuit is in a zero-crossing state or a high-voltage state. The comparison module is also connected to the protection module. When the zero-crossing detection circuit detects that the inductor current is zero, the protection module promptly The ground turns off the synchronous rectifier to protect the circuit.

[0017] The pressure-resistant tubes of the sampling circuit are PMOS tubes and NMOS t...

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Abstract

The invention discloses a zero-cross detection circuit. Voltage-withstanding tubes of a sampling circuit are a PMOS (P-channel Metal Oxide Semiconductor) tube and an NMOS (N-channel Metal Oxide Semiconductor) tube, so that the problem of short service life due to high voltage damage can be solved. The zero-cross detection circuit also comprises a current bias module; the phenomenon of great errors caused by the influence of channel length modulation effect on the mirror current can be reduced; a current comparator is set into a two-stage current comparator; a cascade device is inserted in a first stage circuit; the gain can be improved, and meanwhile, great oscillation amplitude can be realized; the lead of the zero-cross detection circuit is 48 to 50mA; the stability and the identification sensitivity of a system can be improved; the work efficiency can be improved; and the application value is very high.

Description

technical field [0001] The invention relates to the field of LED circuits, in particular to a zero-crossing detection circuit. Background technique [0002] Switching power supply management chips are widely used in LED products, and small size, low power consumption, high efficiency, light weight, low cost and high reliability have become the main trend of switching power supply development. The current detection circuit is an important component module of the power management chip. Its main function is to detect the current on some components or lines, and the detected signal [0003] Used to feed back into the system to protect and control the circuit system, current detection technology plays a very important role in power management chips and other electronic applications. At present, the DC / DC zero-crossing detection circuit has the problems of poor stability and low discrimination sensitivity. Contents of the invention [0004] The purpose of the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12G01R19/175
CPCH02H7/1213G01R19/175
Inventor 崔俊国朱成华
Owner WUHU RUIXIN ELECTRONICS TECH CO LTD
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