CN102707127A - Simplified type alternating-current zero-crossing detecting and amplitude value sampling unit - Google Patents

Simplified type alternating-current zero-crossing detecting and amplitude value sampling unit Download PDF

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Publication number
CN102707127A
CN102707127A CN2012101705195A CN201210170519A CN102707127A CN 102707127 A CN102707127 A CN 102707127A CN 2012101705195 A CN2012101705195 A CN 2012101705195A CN 201210170519 A CN201210170519 A CN 201210170519A CN 102707127 A CN102707127 A CN 102707127A
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CN
China
Prior art keywords
current
microprocessor
sampling
current zero
voltage
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CN2012101705195A
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Chinese (zh)
Inventor
邓建飞
邓丽
刘宝华
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长沙奥托自动化技术有限公司
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Priority to CN2012101705195A priority Critical patent/CN102707127A/en
Publication of CN102707127A publication Critical patent/CN102707127A/en

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Abstract

The invention relates to a simplified alternating-current zero-crossing detecting and amplitude value sampling unit which comprises a microprocessor, a current transformer, and a voltage amplitude value sampling component and a current zero-crossing detecting component which are connected with the current transformer, wherein the voltage amplitude value sampling component comprises a rectifying bridge, a voltage-stabilizing tube D18 and a first filter circuit which are sequentially connected, and the current value obtained by sampling of the current transformer sequentially flows the rectifying bridge, the voltage-stabilizing tube D18 and the first filter circuit, and a direct-current voltage signal is output to the AD (analog/digital) conversion port of the microprocessor for processing by the microprocessor; and the current zero crossing detecting component comprises a second filter circuit, a differential comparator, and a schmitt trigger which are sequentially connected, and the current value obtained by sampling of the current transformer flows through the second filter circuit, the differential comparator and the schmitt trigger and then is transmitted to the microprocessor for generating interrupt. The simplified alternating-current zero-crossing detecting and amplitude value sampling unit has the advantages of simple and compact structure, low cost, wide application range, capability of greatly improving the working stability and reliability and the like.

Description

Simple type alternating current zero crossing detects and the amplitude sampling apparatus

Technical field

The present invention is mainly concerned with that motor drags, thyristor control field, refers in particular to a kind of alternating current zero crossing and detects and the amplitude sampling apparatus.

Background technology

In the prior art, current sampling circuit is too complicated mostly, and it has adopted too much components and parts, thereby has increased hardware cost greatly.Common current sample is handled needs High Performance DSP and hypervelocity AD conversion chip mostly, less demanding for real-time performance, and the strict occasion of cost control does not still have the unique circuit structure.In general custom circuit, detect if realize current amplitude sampling and current zero-crossing point simultaneously, will make circuit abnormality lengthy and jumbled, complex design, cost improves more.

At present, conventional current sampling circuit is as shown in Figure 1, all is to adopt high precision current transformer, the mode of passing through operational amplifier making alive follower then.In said structure, voltage follower mainly plays the effect of isolation, in order to realize impedance matching; Adopt diode clamp at the A/D inlet, prevent that the A/D input voltage from crossing the border.The foregoing circuit structure can realize the instantaneous collection of electric current, has higher real-time acquisition performance; This circuit needs high performance DSP that the data of gathering are handled in real time, adopts the high-speed a/d conversion chip, handles through dsp software again, and current phase can be through calculating.But the hardware cost and the intractability of this circuit structure are higher, and the continuous real time high-speed of A/D conversion chip and DSP is handled, and consumed a large amount of software and hardware resources, and this circuit will have special positive-negative power supply.Converting the alternating current that collects into voltage signal through operational amplifier, need be 0~3.3V unipolarity voltage signal with the ac voltage signal translation through superpotential translation circuit also, sends into the A/D passage pin of DSP then.For voltage translation circuit, realize comparatively accurate voltage translation, convert bipolarity into unipolarity, need expend more debug time.

Summary of the invention

The technical matters that the present invention will solve just is: to the technical matters that prior art exists, the present invention provides a kind of simple type alternating current zero crossing simple and compact for structure, with low cost, applied widely, that can improve job stability and reliability greatly to detect and the amplitude sampling apparatus.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

A kind of simple type alternating current zero crossing detects and the amplitude sampling apparatus; Comprise microprocessor, current transformer and voltage magnitude sampling component that links to each other with current transformer and current zero-crossing point detection components; Said voltage magnitude sampling component comprises successively rectifier bridge, stabilivolt D18 that links to each other and first filtering circuit of being made up of resistance R 38 and capacitor C 13, by the current transformer current value that the obtains AD EOC confession microprocessor processes of output dc voltage signal to microprocessor behind rectifier bridge, stabilivolt D18, first filtering circuit successively of sampling; Said current zero-crossing point detection components comprise successively link to each other forms second filtering circuit and differential comparator, Schmidt trigger by resistance R 30, resistance R 42 and capacitor C 11, the said current value that is obtained by the current transformer sampling transmits through second filtering circuit, differential comparator, Schmidt trigger after as for microprocessor and is used for the generation interruption.

As further improvement of the present invention:

Further be provided with behind the said Schmidt trigger and be used for the resistance R 31 of threshold currents protection to prevent microprocessor from interrupting making a slip of the tongue stream damages.

Compared with prior art, the invention has the advantages that:

1, simple type alternating current zero crossing of the present invention detects and the amplitude sampling apparatus; Structural refinement is compact, superior performance, adopts minimum components and parts can accomplish the sampling function, has reached the highest effectiveness; Total is skillfully constructed; Saved hardware cost, improved the stability and the reliability of circuit, especially be fit to for the strict occasion of cost control.

2, simple type alternating current zero crossing of the present invention detects and the amplitude sampling apparatus, is applicable to the occasion that real-time is less demanding.The AD conversion chip that speed is lower also can be suitable for (comprising the serial AD conversion chip) in this circuit, the low speed single-chip microcomputer also can be used for the processing of sampled value, and the present invention has filled up the blank of current sampling circuit when real-time is less demanding.

3, simple type alternating current zero crossing of the present invention detects and the amplitude sampling apparatus, is the single power supply circuit.Converting voltage signal after the use of high-performance rectifier bridge makes alternating current handle to can be directly and AD conversion port interface, has exempted the voltage translation processing and the loaded down with trivial details debugging of special-purpose positive and negative power supply and complicacy.

Description of drawings

Fig. 1 is the circuit theory synoptic diagram of prior art.

Fig. 2 is a circuit theory synoptic diagram of the present invention.

Marginal data

1, voltage magnitude sampling component; 2, current zero-crossing point detection components; 3, current transformer; 4, AD conversion port; 5, differential comparator; 6, Schmidt trigger; 7, rectifier bridge; 8, microprocessor.

Embodiment

Below will combine Figure of description and specific embodiment that the present invention is explained further details.

As shown in Figure 2; Simple type alternating current zero crossing of the present invention detects and the amplitude sampling apparatus; Comprise microprocessor 8, current transformer 3 and voltage magnitude sampling component 1 that links to each other with current transformer 3 and current zero-crossing point detection components 2; Voltage magnitude sampling component 1 comprises successively rectifier bridge 7, stabilivolt D18 that links to each other and first filtering circuit of being made up of resistance R 38 and capacitor C 13, by current transformer 3 current value that the obtains AD conversion port 4 of output dc voltage signal to microprocessor 8 behind rectifier bridge 7, stabilivolt D18, first filtering circuit successively of sampling; Current zero-crossing point detection components 2 comprises successively second filtering circuit of being made up of resistance R 30, resistance R 42 and capacitor C 11 that links to each other and differential comparator 5, Schmidt trigger 6, and the current value that is obtained by current transformer 3 samplings transmits through second filtering circuit, differential comparator 5, Schmidt trigger 6 after as for microprocessor 8 and is used for the generation interruption.

In the present embodiment, current signal gets into rectifier bridge 7 MB6S through Iin, is come out by Iout again.In voltage magnitude sampling component 1, rectifier bridge 7 is the MB6S rectifier bridge, and the current value that is obtained by current transformer 3 samplings is the unipolarity electric current through these rectifier bridge 7 back rectifications.Stabilivolt D18 plays the voltage clamp protective effect, guarantees that the voltage of the AD conversion port 4 of microprocessor 8 can not cross the border.The voltage stabilizing value of stabilivolt D18 can be confirmed according to the maximal value of the input voltage of the AD conversion port 4 of microprocessor 8.Resistance R 38 is responsible for converting the one pole alternating current into voltage signal, and first filtering circuit is converted into d. c. voltage signal with ac voltage signal.The value of resistance R 38 can be passed through debugging and confirmed.D. c. voltage signal amplitude and grid alternating current stream amplitude are proportional, and therefore, this d. c. voltage signal just can be used for representing the amplitude of grid alternating current stream.This d. c. voltage signal is connected to the port of the AD conversion port 4 of microprocessor 8 (single-chip microcomputer or dsp chip), after 4 conversions of the AD of microprocessor 8 conversion port, sends microprocessor 8 to and handles, thereby accomplished the current amplitude sampling.The present invention can be applied to the less demanding occasion of real-time current property.

In the present embodiment, in current zero-crossing point detection components 2, the current value that is obtained by current transformer 3 sampling is through second filtering circuit, and second filtering circuit is used for filtering out pulse spike.Alternating current produces square-wave signal behind high performance differential comparator 5 LM239, after Schmidt trigger 6 74HC14 shaping pulses, send microprocessor 8 to and be used for producing interruption again.During work; Current signal is through the metering function of R30; Arrive the inverting input of differential comparator 5 LM239; Convert alternating current to square wave voltage signal, R28 becomes certain relation with the R30 resistance, guarantees that input current signal becomes 74HC14 port acceptable signal (0~5v) after treatment; Pass through Schmidt trigger 6 74HC14 again, with the square-wave signal shaping, the edge is more precipitous; Send signal to microprocessor 8 capturing units then, produce and interrupt, obtain the current zero-crossing point signal.

In the present embodiment, resistance R 31 is set further behind Schmidt trigger 6, this resistance 31 is used for threshold currents protection, prevents that microprocessor 8 stream that interrupts making a slip of the tongue from damaging.

Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art some improvement and retouching not breaking away under the principle of the invention prerequisite should be regarded as protection scope of the present invention.

Claims (2)

1. a simple type alternating current zero crossing detects and the amplitude sampling apparatus; It is characterized in that: comprise microprocessor (8), current transformer (3) and voltage magnitude sampling component (1) that links to each other with current transformer (3) and current zero-crossing point detection components (2); Said voltage magnitude sampling component (1) comprises successively rectifier bridge (7), stabilivolt D18 that links to each other and first filtering circuit of being made up of resistance R 38 and capacitor C 13, and the current value that is obtained by current transformer (3) sampling is the AD conversion port (4) of output dc voltage signal to microprocessor confession microprocessor processes behind rectifier bridge (7), stabilivolt D18, first filtering circuit successively; Said current zero-crossing point detection components (2) comprises successively second filtering circuit of being made up of resistance R 30, resistance R 42 and capacitor C 11 that links to each other and differential comparator (5), Schmidt trigger (6), and the said current value that is obtained by current transformer (3) sampling transmits through second filtering circuit, differential comparator (5), Schmidt trigger (6) after as for microprocessor (8) and is used for the generation interruption.
2. simple type alternating current zero crossing according to claim 1 detects and the amplitude sampling apparatus, it is characterized in that: said Schmidt trigger (6) back further is provided with and is used for the resistance R 31 of threshold currents protection to prevent microprocessor (8) from interrupting making a slip of the tongue stream damages.
CN2012101705195A 2012-05-29 2012-05-29 Simplified type alternating-current zero-crossing detecting and amplitude value sampling unit CN102707127A (en)

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CN103107812A (en) * 2013-01-16 2013-05-15 航天科工深圳(集团)有限公司 Alternating signal sampling device and implementation method thereof
CN103217572A (en) * 2013-04-07 2013-07-24 深圳和而泰智能控制股份有限公司 Device and method for detecting voltage and zero crossing point of alternating current
WO2014096922A1 (en) * 2012-12-20 2014-06-26 Marvell World Trade Ltd. Zero crossing detector using current mode approach
CN104734331A (en) * 2015-04-04 2015-06-24 佛山蓝途科技有限公司 Voltage sampling circuit for double-power-source change-over switch electric appliance
CN107957514A (en) * 2016-10-14 2018-04-24 佛山市顺德区美的电热电器制造有限公司 A kind of zero crossing detection device, method and electric appliance

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WO2014096922A1 (en) * 2012-12-20 2014-06-26 Marvell World Trade Ltd. Zero crossing detector using current mode approach
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CN103107812A (en) * 2013-01-16 2013-05-15 航天科工深圳(集团)有限公司 Alternating signal sampling device and implementation method thereof
CN103217572A (en) * 2013-04-07 2013-07-24 深圳和而泰智能控制股份有限公司 Device and method for detecting voltage and zero crossing point of alternating current
CN103217572B (en) * 2013-04-07 2015-09-23 深圳和而泰智能控制股份有限公司 Alternating current voltage and zero-crossing examination device and method thereof
CN104734331A (en) * 2015-04-04 2015-06-24 佛山蓝途科技有限公司 Voltage sampling circuit for double-power-source change-over switch electric appliance
CN107957514A (en) * 2016-10-14 2018-04-24 佛山市顺德区美的电热电器制造有限公司 A kind of zero crossing detection device, method and electric appliance
CN107957514B (en) * 2016-10-14 2020-12-04 佛山市顺德区美的电热电器制造有限公司 Zero-crossing detection device and method and electric appliance

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