CN204694767U - A kind of Width funtion low-power consumption two-way zero-crossing testing circuit - Google Patents
A kind of Width funtion low-power consumption two-way zero-crossing testing circuit Download PDFInfo
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- CN204694767U CN204694767U CN201520404216.4U CN201520404216U CN204694767U CN 204694767 U CN204694767 U CN 204694767U CN 201520404216 U CN201520404216 U CN 201520404216U CN 204694767 U CN204694767 U CN 204694767U
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Abstract
The utility model discloses a kind of Width funtion low-power consumption two-way zero-crossing testing circuit, comprise the controlled side that current-limiting resistance, two-way isolation photoelectric coupled circuit, light isolation triode ac switch driver and microprocessor, the input side of described current-limiting resistance and two-way isolation photoelectric coupled circuit and light isolates triode ac switch driver to connect successively, the outgoing side of two-way isolation photoelectric coupled circuit connects the reverse input end of comparer, and the outgoing side of light isolation triode ac switch driver connects microprocessor; The output signal of two-way isolation photoelectric coupled circuit is converted to digital signal triggers microprocessor and interrupts by described comparer, the conducting of timing microprocessor periodic triggers light isolation triode ac switch driver.Zero cross detection circuit of the present utility model, can ensure the accuracy of detection of its zero crossing, the circuit power consumption worked under can being greatly reduced in wide-voltage range again.
Description
Technical field
The utility model relates to Single-chip Controlling and power line communication technology field, particularly relates to a kind of Width funtion low-power consumption two-way zero-crossing testing circuit.
Background technology
At present, many technical fields often can detect the zero crossing of alternating current, as electric control system.For realizing the control to high power load, precisely control silicon controlled particularly important, how to realize Trig control signal accurately, the zero-crossing examination of electrical network is the gordian technique of this control.
Existing zero passage detection major part adopts rectifier bridge that AC signal is rectified into half-wave voltage signal, and through the current-limiting resistance that and optocoupler connect, the secondary connecting triode of optocoupler converts simulating signal to digital signal to controller.Wherein the value of current-limiting resistance is the key of zero passage detection precision, and when value is larger, detect zero migration comparatively large for true zero point, error is comparatively large, when voltage ripple of power network, detects zero point also along with fluctuation, causes detecting mistake.And value less time, detect zero migration less for true zero point, error is less, when voltage ripple of power network, detects fluctuation at zero point less, but circuit power consumption becomes large.Therefore it is not suitable in wide-voltage range work, by the phenomenon that generation zero passage detection precision and circuit power consumption can not get both.
Therefore, prior art needs further to be improved.
Utility model content
Problem to be solved in the utility model is, provides a kind of Width funtion low-power consumption two-way zero-crossing testing circuit.Solve the high precision that cannot simultaneously ensure to detect under wide-voltage range work and the technical matters reducing circuit power consumption.
The technical scheme that the utility model adopts is:
A kind of Width funtion low-power consumption two-way zero-crossing testing circuit, comprise the controlled side that current-limiting resistance, two-way isolation photoelectric coupled circuit, light isolation triode ac switch driver and microprocessor, the input side of described current-limiting resistance and two-way isolation photoelectric coupled circuit and light isolates triode ac switch driver to connect successively, the outgoing side of two-way isolation photoelectric coupled circuit connects the reverse input end of comparer, and the control side of light isolation triode ac switch driver connects microprocessor; The output signal of two-way isolation photoelectric coupled circuit is converted to digital signal triggers microprocessor and interrupts by described comparer, the conducting of timing microprocessor periodic triggers light isolation triode ac switch driver.
Described Width funtion low-power consumption two-way zero-crossing testing circuit, wherein, the two-way isolation photo-coupler that described two-way isolation photoelectric coupled circuit comprises single interchange photo-coupler or is made up of 2 unidirectional isolation optocouplers.
Described Width funtion low-power consumption two-way zero-crossing testing circuit, wherein, also comprise the first divider resistance, the second divider resistance and the 3rd divider resistance, described first divider resistance connects the reverse input end of input voltage and comparer respectively, described second divider resistance connects the positive input of input voltage and comparer respectively, described 3rd divider resistance ground connection and the positive input being connected comparer respectively.
Described Width funtion low-power consumption two-way zero-crossing testing circuit, wherein, the second divider resistance and the 3rd divider resistance are adjustable resistance.
Described Width funtion low-power consumption two-way zero-crossing testing circuit, wherein, the cycle that described microprocessor triggers the conducting of light isolation triode ac switch driver is 7-9ms.
Described Width funtion low-power consumption two-way zero-crossing testing circuit, wherein, described interchange photo-coupler is that PS2506-1 exchanges photo-coupler.
Described Width funtion low-power consumption two-way zero-crossing testing circuit, wherein, the resistance value of described current-limiting resistance is 100K ohm.
Compared with prior art, zero cross detection circuit of the present utility model can be taken into account testing circuit and to work under wide-voltage range and circuit power consumption is very little while ensureing accuracy of detection.
Accompanying drawing explanation
The Width funtion low-power consumption two-way zero-crossing testing circuit that Fig. 1 provides for the utility model realize schematic diagram.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As described in Figure 1, the Width funtion low-power consumption two-way zero-crossing testing circuit that the utility model provides, comprise current-limiting resistance R1, two-way isolation photoelectric coupled circuit U1, light isolation triode ac switch driver U2 and microprocessor (not shown), wherein, in high-pressure side, connect successively in the controlled side that the input side of described current-limiting resistance R1 and two-way isolation photoelectric coupled circuit U1 and light isolate triode ac switch driver U2; In low-pressure side, the outgoing side plus earth of two-way isolation photoelectric coupled circuit U1, anode meets reverse input end and the first divider resistance R2 of comparer, the control side negative electrode of light isolation triode ac switch driver connects the I/O interface of microprocessor, anode connects current-limiting resistance R6, another termination input voltage VCC of R6; The positive input of comparer is also connected with the other end connection input voltage VCC of the second divider resistance R3 and the 3rd divider resistance R4, R3, the other end ground connection of R4.The I/O interface of the output termination microprocessor of comparer and another termination input voltage VCC of pull-up resistor R5, R5.
The output signal of two-way isolation photoelectric coupled circuit U1 is converted to digital signal triggers microprocessor and interrupts by comparer, the conducting of timing microprocessor periodic triggers light isolation triode ac switch driver U2.Wherein specific implementation is: input side alternating current is at voltage signal crest place, and the electric current flowing through the input side of U1 is comparatively large, and outgoing side and R2 dividing potential drop obtain being worth the value Vref being less than R3 and R4 dividing potential drop and obtaining, and comparer exports high level; Input AC piezoelectric voltage signal is near zero-crossing point, and voltage is less, and the electric current flowing through the outgoing side of U1 reduces, and outgoing side partial pressure value is greater than Vref, and comparer is converted to low level by high level, level signal input microprocessor, triggered interrupts.After microprocessor triggered interrupts, judge to process several cycle length, during rear triggered interrupts, microprocessor exports high level, closes U2, then presses the conducting of certain hour clocked flip U2.
The two-way isolation photoelectric coupled circuit of the present embodiment can be single interchange photo-coupler, and also can be the two-way isolation photo-coupler be made up of 2 unidirectional isolation optocouplers, U1 preferably adopts NEC high-transmission to exchange photo-coupler than PS2506-1.
Further, second divider resistance R3 and the 3rd divider resistance R4 is adjustable resistance, the ratio of two divider resistance R3 and R4 can be adjusted to regulate comparer threshold voltage Vref, and then adjust trigger pip and the mistiming at zero point, to ensure the precision of zero passage detection.
Composition graphs 1, is described further for 220 volts, China, 50Hz electric main.Electrical network powers on, and Microprocessor S3C44B0X I/O2 exports high level, and testing circuit does not work.Treat that circuit powers on completely, voltage stabilization, microprocessor exports a low level makes light isolate the conducting of triode ac switch driver, zero cross detection circuit work to I/O2.U1 primary current is flow through large at electrical network crest place, comparer exports high level, zero point place and comparer be converted to low level by high level, triggers microprocessor interrupts, after microprocessor judges several interrupt cycle, processor exports a high level and makes light isolate triode ac switch driver to I/O2 to cut out before near zero-crossing point.Due to 50Hz mains frequency, half wave cycles is 10ms, again triggers the conducting before closing on zero point of light isolation triode ac switch driver, restoring circuit work after utilizing timing microprocessor 7-9ms.When zero point being detected, triggers microprocessor interrupts, and closes black out isolation triode ac switch driver, goes round and begins again.
Current-limiting resistance R1 value adopts 100K in the present embodiment, and flow through electric current at 220V peak value place like this and be about 3mA, during long-term work, the power consumption of current-limiting resistance R1 is about 0.5W.And detection is closed in electrical network peak region, cutoff circuit, will make R1 power consumption be down to 25mW, substantially reduce the power consumption of testing circuit like this.In addition the value due to current-limiting resistance R1 is less, and its accuracy of detection is higher.
In a word, by zero cross detection circuit of the present utility model, the accuracy of detection of its zero crossing can be ensured, the circuit power consumption worked under can being greatly reduced in wide-voltage range again.
Should be understood that, application of the present utility model is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (7)
1. a Width funtion low-power consumption two-way zero-crossing testing circuit, it is characterized in that, comprise the controlled side that current-limiting resistance, two-way isolation photoelectric coupled circuit, light isolation triode ac switch driver and microprocessor, the input side of described current-limiting resistance and two-way isolation photoelectric coupled circuit and light isolates triode ac switch driver to connect successively, the outgoing side of two-way isolation photoelectric coupled circuit connects the reverse input end of comparer, and the control side of light isolation triode ac switch driver connects microprocessor; The output signal of two-way isolation photoelectric coupled circuit is converted to digital signal triggers microprocessor and interrupts by described comparer, the conducting of timing microprocessor periodic triggers light isolation triode ac switch driver.
2. Width funtion low-power consumption two-way zero-crossing testing circuit according to claim 1, is characterized in that, the two-way isolation photo-coupler that described two-way isolation photoelectric coupled circuit comprises single interchange photo-coupler or is made up of 2 unidirectional isolation optocouplers.
3. Width funtion low-power consumption two-way zero-crossing testing circuit according to claim 1, it is characterized in that, also comprise the first divider resistance, the second divider resistance and the 3rd divider resistance, described first divider resistance connects the reverse input end of input voltage and comparer respectively, described second divider resistance connects the positive input of input voltage and comparer respectively, described 3rd divider resistance ground connection and the positive input being connected comparer respectively.
4. Width funtion low-power consumption two-way zero-crossing testing circuit according to claim 3, is characterized in that, the second divider resistance and the 3rd divider resistance are adjustable resistance.
5. Width funtion low-power consumption two-way zero-crossing testing circuit according to claim 1, is characterized in that, the cycle that described microprocessor triggers the conducting of light isolation triode ac switch driver is 7-9ms.
6. Width funtion low-power consumption two-way zero-crossing testing circuit according to claim 2, is characterized in that, described interchange photo-coupler is that PS2506-1 exchanges photo-coupler.
7. Width funtion low-power consumption two-way zero-crossing testing circuit according to claim 1, is characterized in that, the resistance value of described current-limiting resistance is 100K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520404216.4U CN204694767U (en) | 2015-06-12 | 2015-06-12 | A kind of Width funtion low-power consumption two-way zero-crossing testing circuit |
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| CN201520404216.4U CN204694767U (en) | 2015-06-12 | 2015-06-12 | A kind of Width funtion low-power consumption two-way zero-crossing testing circuit |
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| CN204694767U true CN204694767U (en) | 2015-10-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490720A (en) * | 2017-09-21 | 2017-12-19 | 源初（广州）科技有限公司 | The Digital Detecting device and detection method of a kind of voltage zero-crossing point of power grid |
| CN115407118A (en) * | 2022-09-03 | 2022-11-29 | 迈思普电子股份有限公司 | AC zero-crossing detection circuit for isolated output square wave |
| CN117054729A (en) * | 2023-10-10 | 2023-11-14 | 钰泰半导体股份有限公司 | Alternating current power line bidirectional zero-crossing detection chip, circuit and method |
-
2015
- 2015-06-12 CN CN201520404216.4U patent/CN204694767U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490720A (en) * | 2017-09-21 | 2017-12-19 | 源初（广州）科技有限公司 | The Digital Detecting device and detection method of a kind of voltage zero-crossing point of power grid |
| CN115407118A (en) * | 2022-09-03 | 2022-11-29 | 迈思普电子股份有限公司 | AC zero-crossing detection circuit for isolated output square wave |
| CN117054729A (en) * | 2023-10-10 | 2023-11-14 | 钰泰半导体股份有限公司 | Alternating current power line bidirectional zero-crossing detection chip, circuit and method |
| CN117054729B (en) * | 2023-10-10 | 2023-12-22 | 钰泰半导体股份有限公司 | Alternating current power line bidirectional zero-crossing detection chip, circuit and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20210612 |
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| CF01 | Termination of patent right due to non-payment of annual fee |