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Wide-range alternating current signal zero-cross detection method and device

An AC signal, zero-crossing detection technology, applied in the field of electronics, to achieve the effect of wide practical value and high precision

Active Publication Date: 2015-10-21
重庆恒锐金鼎感应科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of circuit can often only be used in applications that do not require high precision.

Method used

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  • Wide-range alternating current signal zero-cross detection method and device
  • Wide-range alternating current signal zero-cross detection method and device
  • Wide-range alternating current signal zero-cross detection method and device

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Embodiment Construction

[0047] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] A method for identifying the zero-crossing point of a rectangular wave signal provided by the present invention specifically includes the following steps:

[0049] Step 1) Rectify the input AC detection signal, and convert the AC signal into a DC signal, which is convenient for detection.

[0050] Step 2) The output signal of the transformation unit is processed by the transformation unit. When the input signal of the transformation unit is less than the set value, the output signal of the transformation unit follows the input signal. When the input signal of the transformation unit is greater than the set value, the output signal of the transformation unit is equal to Set value; during current type detection, the conversion unit is used to ensure that the actual output current value I≤I out , when the voltage type is detected, the ...

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Abstract

The invention relates to a wide-range alternating current signal zero-cross detection method and device and belongs to the technical field of electronics. The wide-range alternating current signal zero-cross detection device comprises a rectification unit, a conversion unit, an amplification unit, a comparison unit and an output unit. For current type detection and voltage type detection, different conversion units and amplification units are designed. The conversion unit designed by the invention is used for achieving wide-range voltage zero-cross detection. According to the invention, no step-down circuit or voltage stabilization amplitude limiting circuit is adopted, direct processing of high voltage signals is conducted, influences of background noise or voltage thresholds on detection precision are reduced, zero-cross detection of large signals and small signals can be achieved at the same time, the precision is high, and wide practical value is achieved.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a method and a device for detecting zero-crossing of a large-range AC signal. Background technique [0002] The zero-crossing detection refers to the detection of the positive and negative half-cycle conversion time of the AC signal. In practical applications, the amplitude range of the input signal processed in the detection circuit is within a relatively small range, such as 1 to 5V, while the amplitude variation range of the actual input signal is large. Signals with small amplitudes need to be amplified first, and signals with large amplitudes need to be down-converted first. [0003] In practical applications, such as when the system is started, the amplitude of the signal is relatively small (often at the microvolt level), while during normal operation, the amplitude of the signal is relatively large (up to several hundred volts). Such as the start of brushless DC motor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/175
Inventor 程森林何强志王川靳双杨发如
Owner 重庆恒锐金鼎感应科技有限公司
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