CN203204062U - Comparator-based voltage signal detection circuit - Google Patents
Comparator-based voltage signal detection circuit Download PDFInfo
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- CN203204062U CN203204062U CN 201320082651 CN201320082651U CN203204062U CN 203204062 U CN203204062 U CN 203204062U CN 201320082651 CN201320082651 CN 201320082651 CN 201320082651 U CN201320082651 U CN 201320082651U CN 203204062 U CN203204062 U CN 203204062U
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Abstract
The utility model discloses a comparator-based voltage signal detection circuit, belongs to the technical fields of strong and light current isolation and detection, and solves problems that convention voltage signal detection circuits is large in power consumption, inaccurate in detection and complicated in structure. The voltage signal detection circuit is based on integrated voltage comparators; a voltage zero-crossing point detection circuit and a voltage isolation detection circuit are designed in a simulation circuit manner, and the alternating-current live wire input end and the alternating-current zero line input end are converted through different circuits and are connected to the integrated voltage comparators, so that outputting of a voltage isolation detection signal and a zero-crossing point detection signal is realized at the same time; and the voltage signal detection circuit is safe and accurate in detection, simple in structure and relatively low in power consumption.
Description
Technical field
The utility model relates to strong and weak electricity isolation and detection technique field, refers to that specifically a kind of voltage over zero of based on the comparison device detects and isolation detection circuit.
Background technology
In intelligent household appliances, use safety and power consumption efficiency for guaranteeing household electrical appliances, strong and weak electricity isolation and voltage over zero testing circuit are absolutely necessary.Voltage isolation circuit can convert High Level AC Voltage (for example civil power) to pulse signal and detect for the light current end system, in the existing voltage isolation circuit, have and adopt isolation voltage to follow chip, but price is higher, and power consumption is also larger; Also have and adopt analog conversion circuit, in circuit, by a sampling capacitor load voltage signal of High Level AC Voltage is changed into the current signal of electric capacity, again this current signal is transferred to the current signal isolation by isolated transmission module the signal processing module of low pressure, and therefrom detect high-voltage AC signal, but only transform current signal with capacitive load, detect very inaccurate.
The voltage zero-crossing detection circuit of existing based on the comparison device compares and exports square-wave signal to detection system by voltage comparator to voltage signal, in circuit, there is not the strong and weak electricity isolator, so need to carry out current limliting to voltage signal processes, cause circuit comparatively complicated, this circuit and voltage isolation detection circuit are separate simultaneously, when needs and voltage isolation detection circuit use simultaneously, then the two to be merged redesign.
The utility model content
The utility model provides a kind of voltage signal testing circuit of based on the comparison device, and its circuit structure is simple, and power consumption is lower, and output voltage isolation detection signal and zero crossing detection signal detect safety and precise simultaneously.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of voltage signal testing circuit of based on the comparison device, comprise the alternating current fire wire input end, alternating current zero line input end, DC power supply circuit and voltage over zero testing circuit, described alternating current fire wire input end is connected the voltage over zero testing circuit with alternating current zero line input end, described voltage over zero testing circuit comprises an integrated voltage comparator, described integrated voltage comparator comprises the first comparer, described alternating current fire wire input end and alternating current zero line input end connect respectively two input ends that are connected to the first comparer behind the rectification reduction voltage circuit, described the first comparator output terminal connects the input end of the first photoisolator, the first photoisolator output terminal output voltage crossover point signal; Described DC power supply circuit connects the power input of described the first photoisolator.The alternating current fire wire input end obtains half-wave voltage signal after the overcommutation reduction voltage circuit, compare with the no-voltage of alternating current zero line input end, can safety and precise under the effect of the first comparer and the first photoisolator obtain the voltage over zero square-wave signal, further detect for weak electricity system.
As preferably, described integrated voltage comparator comprises the second comparer, the input end of the second comparer connects respectively alternating current fire wire input end and a waveform generator, connect the level and smooth reduction voltage circuit of rectification between the input end of described alternating current fire wire input end and the second comparer, the output terminal of described the second comparer connects the input end of the second photoisolator, the second photoisolator output terminal output voltage signal.Above-mentioned each device has formed the voltage isolation detection circuit, wherein the second comparer and the first comparer are integrated can simplify circuit, alternating current can be converted to level and smooth direct current through rectifier smoothing circuit, the waveform signal of being convenient to itself and described waveform generator compares.
As preferably, described waveform generator is triangular signal generator based.
As preferably, described integrated voltage comparator comprises the 3rd comparer and the 4th comparer, described triangular signal generator based be that the single supply that forms of the 3rd comparer and the 4th comparer is triangular signal generator based, its output signal frequency is identical with the signal frequency of alternating current fire wire input end, and described DC power supply circuit connects triangular signal generator based power input.Described the first comparer, the second comparer, the 3rd comparer and the 4th comparer all are integrated in the integrated voltage comparator, can further simplify circuit.
As preferably, the level and smooth reduction voltage circuit of described rectification comprises the first diode, the first resistance and the RC rectification circuit that is comprised of the second resistance the first Capacitance parallel connection, described alternating current fire wire input end connects the positive pole of the first diode, the negative pole of described the first diode connects the first resistance one end, and the first resistance other end connects the RC rectification circuit.
As preferably, described the second photoisolator is photoelectrical coupler, and its output terminal has connected the first pull-up resistor and filtering circuit, and described DC power supply circuit connects the first pull-up resistor.Pull-up resistor and filtering circuit guarantee that signal stabilization is reliable.
As preferably, described rectification reduction voltage circuit is composed in series by diode and two resistance, and the tie point of two resistance connects the input end of described the first comparer.
As preferably, described the first photoisolator is photoelectrical coupler, and its output terminal has connected the second pull-up resistor, and described DC power supply circuit connects the second pull-up resistor.
As preferably, described DC power supply circuit comprises a three-terminal voltage-stabilizing pipe.The three-terminal voltage-stabilizing pipe guarantees the output voltage stabilization of DC power supply circuit.
After adopting technique scheme, the utlity model has following advantage: adopt mimic channel to realize that the isolation detection of ac signal and zero crossing detect, comparing isolation voltage, to follow chip cost lower, power consumption is less, take comparer as the basic guarantee detection signal accurately and reliably simultaneously, photoisolator guarantees circuit safety; The 3rd comparer and the 4th comparer are integrated in the integrated voltage comparator in the second comparer that the first comparer in the voltage signal isolation detection circuit and voltage over zero detect and the waveform signal signal generator circuit, have simplified whole circuit structure.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the physical circuit connection layout of waveform generator in the utility model;
Fig. 3 is the concrete connection layout of voltage isolation detection circuit in the utility model;
Fig. 4 is the concrete connection layout of voltage over zero testing circuit in the utility model;
Fig. 5 is the concrete connection layout of DC power supply circuit in the utility model;
Fig. 6 is the signal waveforms of the first comparer input and output side in the utility model;
Fig. 7 is the signal waveforms of the second comparer input and output side in the utility model.
Embodiment
Referring to Fig. 1-5, wherein Fig. 1 is the voltage signal testing circuit structured flowchart of a kind of based on the comparison device of the utility model, its signal input part comprises alternating current fire wire input end ACL and alternating current zero line input end ACN, be respectively the voltage over zero testing circuit and the voltage isolation detection circuit provides signal source, described voltage over zero testing circuit has comprised the first comparer U1, alternating current fire wire input end ACL and alternating current zero line input end CAN are connected to the input end of the first comparer U1 behind a rectification reduction voltage circuit, after the overcommutation step-down, the sinusoidal ac signal of input end is converted to half-wave voltage signal, described the first comparer U1 output terminal connects the input end of the first photoisolator U2, the first photoisolator U2 output terminal output voltage crossover point signal.
Described voltage isolation detection circuit comprises the second comparer U3, the input end of the second comparer U3 connects respectively alternating current fire wire input end ACL and a waveform generator, connect the level and smooth reduction voltage circuit of rectification between the input end of described alternating current fire wire input end ACL and the second comparer U3, by the level and smooth reduction voltage circuit of rectification AC signal is converted to level and smooth direct current signal.The output terminal of described the second comparer U3 connects the input end of the second photoisolator U4, the second photoisolator U4 output terminal output voltage signal.Described the first and second photoisolators provide power supply by DC power supply circuit, and the two can guarantee between the strong and weak electricity transmission of signal safely and fast; Described the first comparer and the second comparer are integrated in the integrated voltage comparator, can simplify whole circuit, reduce power consumption.
In the present embodiment, described waveform generator preferably is convenient to the triangular signal generator based of comparer work, can certainly select the waveform generator of other types also to realize the as a comparison contrast potential signal generator of device, as shown in Figure 2, described triangular signal generator based the 3rd comparer U5 and the 4th comparer U6 that comprises in the integrated voltage comparator, the 3rd comparer U5 and the 4th comparer U6 form the comparatively simple single supply triangular-wave generator of structure, the signal frequency of its output signal frequency and alternating current fire wire input end ACL is identical accurate to guarantee institute's detection signal that obtained, the triangular signal generator based power input of described DC power supply circuit connection.Described the first comparer, the second comparer, the 3rd comparer and the 4th comparer all are integrated in the integrated voltage comparator, can further simplify circuit.
Referring to Fig. 3, in the present embodiment, the preferred level and smooth reduction voltage circuit of rectification comprises the first diode D1, the first resistance R 1 and the RC rectification circuit that is composed in parallel by the second resistance R 2 first capacitor C 1, described alternating current fire wire input end ACL connects the positive pole of the one or two utmost point D1 pipe, the negative pole of described the first diode D1 connects the first resistance R 1 one ends, and the first resistance R 1 other end connects the RC rectification circuit.Rectification is converted to half-wave voltage signal to the ac signal of alternating current fire wire input end ACL through diode D1, and 1 pair of half-wave voltage signal of the first resistance R is carried out the step-down processing, and the RC rectification circuit then becomes level and smooth dc signal with the half-wave voltage signal rectification.Can convert the ac signal of alternating current fire wire input end ACL to level and smooth dc signal through rectifier smoothing circuit, the triangular waveform signal of being convenient to itself and described waveform generator compares.Described the second photoisolator U4 is preferably photoelectrical coupler, is the burning voltage signal, the filtering circuit that its output terminal has connected the first pull-up resistor R3 and formed by two Capacitance parallel connections, and described DC power supply circuit connects the first pull-up resistor R3.
Referring to Fig. 4, in the present embodiment, preferred rectification reduction voltage circuit is composed in series by diode and two resistance, and the tie point of two resistance connects the input end of described the first comparer U1.Alternating current fire wire input end ACL obtains half-wave voltage signal after the overcommutation reduction voltage circuit, compare with the no-voltage of alternating current zero line input end ACN, can safety and precise under the effect of the first comparer U1 and the first photoisolator U2 obtain the voltage over zero square-wave signal, further detect for weak electricity system.Described the first photoisolator U2 is preferably photoelectrical coupler, and for guaranteeing stable output signal, its output terminal has connected the second pull-up resistor R4, and described DC power supply circuit connects the second pull-up resistor R4.
Referring to Fig. 5, described DC power supply circuit comprises that a three-terminal voltage-stabilizing pipe U7 is to guarantee the DC voltage of DC power supply circuit stable output.
Referring to Fig. 6 and Fig. 4, the first comparer U3 input end in the voltage over zero testing circuit is respectively half-wave voltage signal and the zero voltage signal after the overcommutation step-down, output terminal S4 is square-wave pulse signal, through the first photoisolator U2, the S4 signal is delivered to the weak electricity measuring system further detect.
Referring to Fig. 7 and Fig. 3, the second comparer U4 input end in the voltage isolation detection circuit is respectively the triangular signal S1 of triangular waveform signal generator and level and smooth direct current signal S2, output terminal is square-wave pulse signal S3, through the second viewpoint isolator U4 the S3 signal is delivered to the weak electricity measuring system and further detects.
Claims (9)
1. voltage signal testing circuit of device based on the comparison, comprise alternating current fire wire input end (ACL), alternating current zero line input end (ACN), DC power supply circuit and voltage over zero testing circuit, described alternating current fire wire input end (ACL) is connected ACN with alternating current zero line input end) connect the voltage over zero testing circuit, it is characterized in that: described voltage over zero testing circuit comprises an integrated voltage comparator, described integrated voltage comparator comprises the first comparer (U1), described alternating current fire wire input end (ACL) is connected ACN with alternating current zero line input end) connect respectively two input ends that are connected to the first comparer (U1) behind the rectification reduction voltage circuit, described the first comparer (U1) output terminal connects the input end of the first photoisolator (U2), the first photoisolator (U2) output terminal output voltage crossover point signal; Described DC power supply circuit connects the power input of described the first photoisolator (U2).
2. the voltage signal testing circuit of based on the comparison device according to claim 1, it is characterized in that: described integrated voltage comparator comprises the second comparer (U3), the input end of the second comparer (U3) connects respectively alternating current fire wire input end (ACL) and a waveform generator, connect the level and smooth reduction voltage circuit of rectification between the input end of described alternating current fire wire input end (ACL) and the second comparer (U3), the output terminal of described the second comparer (U3) connects the input end of the second photoisolator (U4), the second photoisolator (U4) output terminal output voltage signal.
3. the voltage signal testing circuit of based on the comparison device according to claim 2, it is characterized in that: described waveform generator is triangular signal generator based.
4. the voltage signal testing circuit of based on the comparison device according to claim 3, it is characterized in that: described integrated voltage comparator comprises the 3rd comparer (U5) and the 4th comparer (U6), described triangular signal generator based be that the single supply that forms of the 3rd comparer (U5) and the 4th comparer (U6) is triangular signal generator based, its output signal frequency is identical with the signal frequency of alternating current fire wire input end (ACL), and described DC power supply circuit connects triangular signal generator based power input.
5. according to claim 2 or the voltage signal testing circuit of 4 described based on the comparison devices, it is characterized in that: the level and smooth reduction voltage circuit of described rectification comprises the first diode (D1), the first resistance (R1) and the RC rectification circuit that is composed in parallel by the second resistance (R2) the first electric capacity (C1), described alternating current fire wire input end (ACL) connects the positive pole of the one or two utmost point (D1) pipe, the negative pole of described the first diode (D1) connects the first resistance (R1) end, and the first resistance (R1) other end connects the RC rectification circuit.
6. the voltage signal testing circuit of based on the comparison device according to claim 5, it is characterized in that: described the second photoisolator (U4) is photoelectrical coupler, its output terminal has connected the first pull-up resistor (R3) and filtering circuit, and described DC power supply circuit connects the first pull-up resistor (R3).
7. according to claim 1 or the voltage signal testing circuit of 6 described based on the comparison devices, it is characterized in that: described rectification reduction voltage circuit is composed in series by a diode and two resistance, and the tie point of two resistance connects the input end of described the first comparer (U1).
8. the voltage signal testing circuit of based on the comparison device according to claim 7, it is characterized in that: described the first photoisolator (U2) is photoelectrical coupler, its output terminal has connected the second pull-up resistor (R4), and described DC power supply circuit connects the second pull-up resistor (R4).
9. according to claim 1 or the voltage signal testing circuit of 8 described based on the comparison devices, it is characterized in that: described DC power supply circuit comprises a three-terminal voltage-stabilizing pipe (U7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082651 CN203204062U (en) | 2013-02-22 | 2013-02-22 | Comparator-based voltage signal detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082651 CN203204062U (en) | 2013-02-22 | 2013-02-22 | Comparator-based voltage signal detection circuit |
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| CN203204062U true CN203204062U (en) | 2013-09-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049143A (en) * | 2014-06-19 | 2014-09-17 | 合肥荣事达三洋电器股份有限公司 | Device and method for commercial power detection |
| CN104090152A (en) * | 2014-06-16 | 2014-10-08 | 福建睿能科技股份有限公司 | Power failure detection circuit of flat knitting machine and power failure detection method thereof |
| CN105510691A (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Network voltage synchronous circuit |
| CN105842527A (en) * | 2016-06-08 | 2016-08-10 | 江苏现代电力科技股份有限公司 | Anti-interference high-precision zero-crossing detection device |
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
-
2013
- 2013-02-22 CN CN 201320082651 patent/CN203204062U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090152A (en) * | 2014-06-16 | 2014-10-08 | 福建睿能科技股份有限公司 | Power failure detection circuit of flat knitting machine and power failure detection method thereof |
| CN104090152B (en) * | 2014-06-16 | 2017-05-17 | 福建睿能科技股份有限公司 | Power failure detection circuit of flat knitting machine and power failure detection method thereof |
| CN104049143A (en) * | 2014-06-19 | 2014-09-17 | 合肥荣事达三洋电器股份有限公司 | Device and method for commercial power detection |
| CN104049143B (en) * | 2014-06-19 | 2017-10-31 | 惠而浦（中国）股份有限公司 | A kind of city's electric detection means and detection method |
| CN105510691A (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Network voltage synchronous circuit |
| CN105842527A (en) * | 2016-06-08 | 2016-08-10 | 江苏现代电力科技股份有限公司 | Anti-interference high-precision zero-crossing detection device |
| CN105842527B (en) * | 2016-06-08 | 2018-10-16 | 江苏现代电力科技股份有限公司 | Anti-interference high-precision zero crossing detection device |
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
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Legal Events
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| C14 | Grant of patent or utility model | ||
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Address after: 250118 999 Mei Li Road, Huaiyin District, Ji'nan, Shandong Patentee after: JOYOUNG Co.,Ltd. Address before: Xinsha Road, Huaiyin District of Ji'nan city of Shandong Province, No. 12 250118 Patentee before: JOYOUNG Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20130918 |