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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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  • Abstract
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  • Claims
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Problems solved by technology

[0004] For this reason, the purpose of the present invention is to propose a zero-crossing detection system to solve the problems of sampling circuit delay, poor sampling consistency, and large loss

Method used

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Embodiment Construction

[0025] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. Several embodiments of the invention are shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0026] It should be noted that when an element is referred to as being “fixed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "left", "right", "upper", "lower" an...

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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...

Claims

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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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