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Zero-crossing detection circuit

A zero-crossing detection circuit and strong current technology, which is applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve problems such as high power consumption, affecting accuracy, and large detection delay, so as to reduce delay , improve accuracy, and reduce circuit power consumption

Pending Publication Date: 2020-08-28
NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zero-crossing detection circuit in the prior art has high power consumption and large detection delay, which affects the accuracy of detection

Method used

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  • Zero-crossing detection circuit
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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0025] figure 1 It is a schematic diagram of a zero-crossing detection circuit in the prior art. The power consumption of this circuit mainly comes from the current limiting resistors R28, R29, and R32 on the strong current side. The reference formula for calculating its power consumption is:

[0026]

[0027] Among them, Un is the LN line voltage, Vd is the forward voltage drop of the rectifier diode, Vop is the forward voltage drop of the optocoupler diode, and R is the sum of the series resistance.

[0028] According to this formu...

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PUM

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Abstract

The invention relates to a zero-crossing detection circuit, which comprises a strong current side part, a weak current side part and an optocoupler module arranged between the strong current side partand the weak current side part. The circuit is characterized in that the strong current side part comprises a current limiting module which is arranged in an alternating current loop to reduce the power consumption of the circuit, and an optocoupler control module which is electrically connected with the current limiting module and the optocoupler module to control the on-off of the optocoupler module and can reduce the conduction delay of the optocoupler module; the weak current side part comprises a direct-current power supply connected with the optocoupler module and an output module connected with the direct-current power supply and the optocoupler module respectively; and the output module can output an output signal for synchronous positive and negative switching along with the on-off of the optocoupler module so as to carry out zero-crossing detection. The detection circuit is low in power consumption and short in time delay.

Description

technical field [0001] The invention relates to the technical field of electric power products, in particular to a zero-crossing detection circuit. Background technique [0002] The power line carrier communication product is based on the power line for signal propagation, and its management unit can judge the phase of the terminal product through the zero-crossing information attached to the terminal product, so as to manage the power line load, noise, and user distribution. The detection of zero-crossing information in the prior art is mostly performed by sampling the zero-crossing signal of the power line voltage and then converting it into a weak current signal that can be processed by a low-voltage chip. However, the zero-crossing detection circuit in the prior art has high power consumption and large detection delay, which affects the accuracy of detection. Contents of the invention [0003] In view of the above problems, the object of the present invention is to pr...

Claims

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Application Information

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IPC IPC(8): G01R19/175G01R15/22
CPCG01R15/22G01R19/175
Inventor 程遥
Owner NINGBO SANXING MEDICAL & ELECTRIC CO LTD