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Method and apparatus for compensating voltage zero-cross detection

A technology of voltage detection and compensation method, applied in the direction of measurement device, measurement of current/voltage, measurement of electrical variables, etc., can solve problems such as small problems and inapplicability

Inactive Publication Date: 2008-11-12
SHENZHEN H&T INTELLIGENT CONTROL
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Problems solved by technology

In the case of low requirements, such as general timing, thyristor driving resistive load, etc., the problem is not big, but it cannot be used in occasions that require very accurate zero-crossing signals

Method used

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  • Method and apparatus for compensating voltage zero-cross detection
  • Method and apparatus for compensating voltage zero-cross detection
  • Method and apparatus for compensating voltage zero-cross detection

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Embodiment Construction

[0023] Such as image 3 As shown, usually the mains voltage standard used by electrical equipment is 220V 50Hz. Due to the conduction characteristics of diodes and triodes, the conduction voltage of general diodes and triodes is about 0.3-0.7V, so when the real voltage crosses zero, figure 1 and figure 2 There will be no rising and falling edges in the shown circuit, which will cause a little offset of the zero-crossing signal. Refer to Figure 4 , in the figure, each waveform is not the standard 10ms, but may be shifted a little, such as 9.5ms, 10.5ms, etc., but the frequency of the waveform still remains unchanged, it is still 50Hz.

[0024] According to the above, in the single-chip microcomputer system, the internal timer of the single-chip microcomputer itself and the external interrupt can be used to cooperate with each other, and the external zero-crossing interrupt signal can be compensated and corrected to obtain a more accurate zero-crossing interrupt signal. In ...

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Abstract

The invention discloses a zero passage voltage detection and compensation method which is characterized by including the steps that: a timer is started up after zero passage voltage interrupt signals are received and the timing time of the timer is the offset time of a zero crossing point of voltage; the interrupt point of the timer is determined as the zero crossing point of the voltage after the interrupt signals of the timer are received. The invention also discloses a corresponding zero passage voltage detection and compensation device. The method and the device of the invention can accurately detect an absolute zero crossing point of the voltage without adding hardware cost and can be applied to occasions demanding very accurate zero passage signals.

Description

technical field [0001] The invention relates to voltage zero-crossing detection technology, in particular to a voltage zero-crossing detection and compensation method and device. Background technique [0002] In electronic technology, zero-crossing refers to the point at which the voltage changes to zero during the voltage change process of the AC voltage. This zero-crossing point is usually used as a reference point in circuit design. It is generally used for timing and switching. SCR control. As a result, many zero-crossing detection methods and circuits have emerged. figure 1 and figure 2 It is two kinds of zero-crossing detection circuits that are commonly used in the prior art by using diodes and triodes respectively. In the above circuits, when the zero-crossing point arrives, a zero-crossing interrupt signal is generated. The I / O port of the microcontroller is sent to the microcontroller. [0003] The problem of the above-mentioned prior art is that the zero-cros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/175
Inventor 邓宝宁刘建伟蒋洪波
Owner SHENZHEN H&T INTELLIGENT CONTROL
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