Zero-cross detection system

A zero-crossing detection and zero-crossing signal technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of large loss, poor sampling consistency, sampling circuit delay, etc., to reduce ripple and avoid harmonics Interference, avoid delay effect

Pending Publication Date: 2019-06-28
深圳市闿思科技有限公司
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Problems solved by technology

[0004] For this reason, the purpose of the present invention is to propose a zero-crossing detectio

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[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or a central element may also exist. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal"...

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Abstract

The invention discloses a zero-cross detection system. The system comprises a zero-cross signal sampling module, a power module and a direct current filtration module, wherein the zero-cross signal sampling module comprises a thunder-proof surge interference circuit and an inductor, the thunder-proof surge interference circuit is connected with an alternating current fire line input end, an alternating current zero line input end and a primary winding of the inductor and at least comprises a safety capacitor, the primary winding of the inductor and the safety capacitor constitute a first filtration circuit, and the primary winding of the inductor is connected to an alternating current grid in series; the power module comprises a bridge rectifier, a clamping circuit, a booster transformer and a primary side feedback system, the clamping circuit is connected with a second auxiliary winding of the booster transformer, a first auxiliary winding of the booster transformer is connected withthe primary side feedback system, and a buffer circuit is arranged on a secondary side winding of the booster transformer and a direct current voltage output end. The problems of delay of the samplingcircuit, poor sampling consistency and high loss can be solved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a zero-crossing detection system. Background technique [0002] With the development of power line carrier communication, people have higher and higher requirements for the synchronization of carrier data, so the requirements for the accuracy of zero-point detection of AC grid voltage are also continuously improved. At present, the commonly used zero-crossing detection circuit uses a current-limiting resistor at the input end to limit the current flowing through the photocoupler. Zero-crossing detection is used in many electronic devices. [0003] The existing zero-crossing detection circuit is simple in principle, and usually adopts resistance voltage division to obtain high-voltage signals, or adopts resistance-capacitance step-down and resistance division to sample AC input signals. In addition, there are some LC oscillation circuits, non-isolated Sampling circuit...

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Application Information

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IPC IPC(8): G01R19/175G01R1/30
Inventor 桑红丽
Owner 深圳市闿思科技有限公司
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