Single-phase AC zero-crossing detection method

A single-phase alternating current, zero-crossing detection technology, applied in the field of detection, can solve the problems of large voltage error, single circuit and unsatisfactory effect of detecting pulsating signal, and achieve the effect of high synchronization reliability and small voltage error.

Active Publication Date: 2020-04-14
SHENZHEN LYTRAN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Using a single-phase AC zero-crossing detection circuit to realize the method of dividing the voltage from the two-phase line (L or N) through resistance, the circuit is single, the voltage error of the detection pulse signal is large, the synchronization reliability is poor, and there is a poor end where the zero-crossing point is ahead. The effect is also very unsatisfactory, and the motor speed and frequency of the electric control system and frequency conversion control system cannot be guaranteed

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  • Single-phase AC zero-crossing detection method

Examples

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Embodiment 1

[0033] like figure 1 As shown, the zero-crossing detection sampling method is used to detect 100HZ and 50HZ pulsating waveforms, sinusoidal alternating current, after full-wave rectification, the output full-wave rectification waveform is connected to the AD sampling port of the single-chip microcomputer through resistor division, and the full-wave rectification waveform is connected to the AD sampling port at the same time. to the zero-crossing detection circuit. The zero-crossing waveform output by the zero-crossing detection circuit is connected to the IO port of the microcontroller, and the software sets the IO port to the pulse width capture mode to capture the pulse width and length of the zero-crossing waveform, such as figure 1 shown. After zero crossing, the AC voltage is sampled at the 1 / 2t position of the pulse width, and the AD value collected at this time is the AD value of the peak voltage. After multiple sampling, take the average to get the peak voltage.

[...

Embodiment 2

[0050] like image 3 As shown, the 100HZ and 50HZ pulsating waveforms are detected by using the method of taking the peak value by multiple sampling. After the 50HZ sinusoidal AC voltage is rectified by half-wave, the output half-wave rectified waveform is connected to the AD sampling port through a high-precision voltage divider resistor. AC voltage sampling is performed at a sampling rate greater than 100HZ, that is, sampling is greater than 200 times, and the largest value (the value is the peak value) is compared and stored. A total of 6 maximum values ​​are stored, and then the average value is obtained.

[0051] like Figure 3 to Figure 4 As shown, the steps of using multiple sampling to get the peak value method are as follows:

[0052] 201. Microcontroller chip (single chip microcomputer) initialization:

[0053]Including: microcontroller system clock initialization, AD sampling initialization, timer initialization, interrupt initialization, data buffer initializatio...

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Abstract

The invention provides a single-phase AC zero crossing detection method. When a waveform is converted from a positive half cycle and when a zero position is passed, 100HZ and 50HZ pulsating waveformsare detected through a zero crossing detection sampling method or a peak value taking method by multiple times of sampling, and through micro control chip judgment, a voltage zero point is detected. The single-phase AC zero crossing detection method has the beneficial effects that the 100HZ and 50HZ pulsating waveforms are detected through the zero crossing detection sampling method or the peak value taking method by multiple times of sampling through micro control chip judgment, the purposes that the voltage zero point time is detected, zero crossing pulse signals are provided for the micro control chip, the zero crossing voltage of the pulsating DC signals can be accurately and effectively detected and calculated, and the control system adjusts the power, the rotation speed or the frequency of the motor can be achieved, the voltage errors are small, the synchronous reliability is high, and accuracy and safety are achieved.

Description

technical field [0001] The invention relates to a detection method, in particular to a single-phase alternating current zero-crossing detection method. Background technique [0002] At present, most of the single-phase AC zero-crossing detection circuits divide the voltage from the two-phase line (L or N) through resistors. When the waveform is converted from the positive half cycle to the negative half cycle, a pulsating signal voltage is taken out when it passes through the zero position. [0003] Using a single-phase AC zero-crossing detection circuit to realize the method of dividing the voltage from the two-phase line (L or N) through resistance, the circuit is single, the voltage error of the detection pulse signal is large, the synchronization reliability is poor, and there is a poor end where the zero-crossing point is ahead. The effect is also very unsatisfactory, and the motor speed and frequency of the electric control system and the frequency conversion control s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/175
CPCG01R19/175
Inventor 徐继林
Owner SHENZHEN LYTRAN TECH
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