CN103780234A - In-phase synchronous pulse detection circuit - Google Patents
In-phase synchronous pulse detection circuit Download PDFInfo
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- CN103780234A CN103780234A CN201410024446.8A CN201410024446A CN103780234A CN 103780234 A CN103780234 A CN 103780234A CN 201410024446 A CN201410024446 A CN 201410024446A CN 103780234 A CN103780234 A CN 103780234A
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- hysteresis comparator
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Abstract
The invention discloses an in-phase synchronous pulse detection circuit which is composed of an amplification circuit and a hysteresis comparison circuit, wherein the amplification circuit comprises an operational amplifier U1. A detected signal enters a Microsoft user 1 input end of the operational amplifier U1 through a series resistor R1, a Microsoft user 2 input end is connected with the output end of the operational amplifier U1 through a resistor R2, and a Microsoft user 3 input end of the operational amplifier U1 is connected with the ground. The hysteresis comparison circuit comprises a hysteresis comparer U2, wherein the output end of the operational amplifier U1 is connected with a Microsoft user 4 input end of the hysteresis comparer U2 through a resistor 4, and finally, the detected signal is detected through the hysteresis comparer U2 and output through the output end. The in-phase synchronous pulse detection circuit can effectively reduce influence of ripple waves, interference and the like on zero-crossing signal detection, has the advantages of being small in phase shifting deviation and strong in anti-interference capability, and can be widely applied to zero-crossing detection on voltage and current signals with ripple waves.
Description
Technical field
The present invention relates to a kind of zero passage signal detection circuit, relate in particular to a kind of in-phase synchronization pulse-detecting circuit.
Background technology
In voltage and current signal zero passage detection, the detection principle of current signal is identical with voltage detecting, only current signal need be converted to the voltage signal of respective magnitudes.Voltage zero-crossing signal detects extensive use in PWM rectifier, PFC circuit of power factor correction, active power filter etc., but in such application, in the voltage signal that sampling obtains, contain high order harmonic component, voltage zero-crossing signal has repeatedly zero crossing near zero-crossing point.In modern power network, because increasing, nonlinear load also there will be this phenomenon.If this signal is directly detected, will obtain multiple zero crossings, cannot reach the effective detection to electrical network zero cross signal.Conventional way is to use hysteresis comparator, eliminates the humorous wave interference of zero crossing with a threshold voltage, and the method can cause phase shift in various degree along with detected varying in size of voltage, affects the precision of rear class control.
Summary of the invention
The object of the present invention is to provide the zero passage signal detection circuit that a kind of phase shift variations is little, antijamming capability is strong.
The present invention realizes like this, a kind of in-phase synchronization pulse-detecting circuit, formed by amplifying circuit and hysteresis comparator circuit, it is characterized in that: described amplifying circuit comprises operational amplifier U1, detected signal enters [user of Microsoft 1] input of described operational amplifier U1 by series resistance R1, should be connected with the output of described operational amplifier U1 by resistance R 2 by [user of Microsoft 2] input, [user of Microsoft 3] input end grounding of described operational amplifier U1; Described hysteresis comparator circuit comprises hysteresis comparator U2, and the output of described operational amplifier U1 is connected with [user of Microsoft 4] input of hysteresis comparator U2 by resistance R 4, and finally detected signal detects by hysteresis comparator U2 and exports from output.
Described operational amplifier U1 is saturation arithmetic amplifier.
In described operational amplification circuit, the resistance of R2 is much larger than the resistance of R1.
The output of described hysteresis comparator U2 connects earth terminal by resistance R 6 simultaneously, can further reduce the phase shift variations of detected signal.
The invention has the beneficial effects as follows: by introduce a regulex between hysteresis comparator and detected signal, utilize the device property of operational amplifier own, the directly harmonic signal impact of elimination zero crossing annex, can significantly reduce different detected signal amplitudes differences simultaneously and differing of causing.Can effectively reduce the impact that ripple, interference etc. detect zero cross signal, have advantages of that phase shift variations is little, antijamming capability is strong, can be widely used in the voltage and current signal zero passage detection with ripple.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
U1 in the drawings-operational amplifier U2-hysteresis comparator R1, R2, R3, R4, R5, R6-resistance VCC-power supply.
Embodiment
For content of the present invention is more easily expressly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation.
As shown in the figure, a kind of in-phase synchronization pulse-detecting circuit, formed by signal amplification circuit and hysteresis comparator circuit, wherein, described signal amplification circuit comprises operational amplifier U1, detected signal enters [user of Microsoft 5] input of described operational amplifier U1 by series resistance R1, should be connected with the output of described operational amplifier U1 by resistance R 2 by [user of Microsoft 6] input, and [user of Microsoft 7] input end grounding of described operational amplifier U1; Described hysteresis comparator circuit comprises hysteresis comparator U2, and the output of described operational amplifier U1 is connected with [user of Microsoft 8] input of hysteresis comparator U2 by resistance R 4, and finally detected signal detects by hysteresis comparator U2 and exports from output.Described operational amplifier U1 is saturation arithmetic amplifier.In described operational amplification circuit, the resistance of R2 is much larger than the resistance of R1.The output of described hysteresis comparator U2 connects earth terminal by resistance R 6 simultaneously, can further reduce the phase shift variations of detected signal.
Operational amplifier U1 and the hysteresis comparator U2 work that all switches on power, input signal first carries out saturation amplification through a saturation arithmetic amplifier U1, then it is again anti-phase to pass through hysteresis comparator U2, obtains and the synchronous synchronization zero-cross pulse signal of input signal.The detected signal of input has been processed into approximate square wave, wherein by selecting the slew rate V of saturation arithmetic amplifier U1
sRparameter, high-frequency interferencing signal is in the link through saturation amplification circuit, and multiplication factor, much smaller than the multiplication factor of low frequency useful signal, can, in this saturation amplification link, just realize without phase shift ground and will be detected the filtering of signal high order harmonic component in this way.Approach square wave through saturation amplification circuit waveform out, pass through again hysteresis comparator U2, the phase shift variations of detected signal reduces greatly, and does not substantially change with the amplitude of detected signal, and the high accuracy that has realized detected signal zero crossing detects.
Claims (4)
1. an in-phase synchronization pulse-detecting circuit, formed by amplifying circuit and hysteresis comparator circuit, it is characterized in that: described amplifying circuit comprises operational amplifier U1, detected signal enters [user of Microsoft 1] input of described operational amplifier U1 by series resistance R1, should be connected with the output of described operational amplifier U1 by resistance R 2 by [user of Microsoft 2] input, [user of Microsoft 3] input end grounding of described operational amplifier U1; Described hysteresis comparator circuit comprises hysteresis comparator U2, and the output of described operational amplifier U1 is connected with [user of Microsoft 4] input of hysteresis comparator U2 by resistance R 4, and finally detected signal detects by hysteresis comparator U2 and exports from output.
2. a kind of in-phase synchronization pulse-detecting circuit according to claim 1, is characterized in that: described operational amplifier U1 is saturation arithmetic amplifier.
3. a kind of in-phase synchronization pulse-detecting circuit according to claim 1, is characterized in that: in described operational amplification circuit, the resistance of R2 is much larger than the resistance of R1.
4. a kind of in-phase synchronization pulse-detecting circuit according to claim 1, is characterized in that: the output of described hysteresis comparator U2 connects earth terminal by resistance R 6 simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024446.8A CN103780234A (en) | 2014-01-20 | 2014-01-20 | In-phase synchronous pulse detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024446.8A CN103780234A (en) | 2014-01-20 | 2014-01-20 | In-phase synchronous pulse detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103780234A true CN103780234A (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410024446.8A Pending CN103780234A (en) | 2014-01-20 | 2014-01-20 | In-phase synchronous pulse detection circuit |
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| CN (1) | CN103780234A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048839A (en) * | 2015-08-27 | 2015-11-11 | 无锡伊佩克科技有限公司 | Vehicle-mounted power supply driving circuit |
| CN106645881A (en) * | 2016-11-25 | 2017-05-10 | 佛山科学技术学院 | Detection circuit capable of tracking peak value |
| CN109100564A (en) * | 2017-06-21 | 2018-12-28 | 浙江大华技术股份有限公司 | A kind of signal fluctuation detection circuit |
| US11196408B2 (en) | 2017-06-21 | 2021-12-07 | Zhejiang Dahua Technology Co., Ltd. | System and method for mixed transmission of signals and power supply through a single cable |
Citations (3)
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| CN1048773A (en) * | 1989-07-10 | 1991-01-23 | 南京航空学院 | Permanent-magnet brush-free dc generator with electronic voltage stabilizer |
| CN102891644A (en) * | 2012-10-08 | 2013-01-23 | 宁波大学 | Two-phase stepping motor driving circuit and motor fault detection method |
| CN204068901U (en) * | 2014-01-20 | 2014-12-31 | 江西清华泰豪三波电机有限公司 | A kind of in-phase synchronization pulse-detecting circuit |
-
2014
- 2014-01-20 CN CN201410024446.8A patent/CN103780234A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048773A (en) * | 1989-07-10 | 1991-01-23 | 南京航空学院 | Permanent-magnet brush-free dc generator with electronic voltage stabilizer |
| CN102891644A (en) * | 2012-10-08 | 2013-01-23 | 宁波大学 | Two-phase stepping motor driving circuit and motor fault detection method |
| CN204068901U (en) * | 2014-01-20 | 2014-12-31 | 江西清华泰豪三波电机有限公司 | A kind of in-phase synchronization pulse-detecting circuit |
Non-Patent Citations (3)
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| 刘俊俊等: "提高过零检测精度的方法研究", 《工业控制计算机》 * |
| 孙民等: "一种基于 dsPIC30F4011 的空调压缩机用无刷直流电动机控制器设计", 《微电机》 * |
| 杨薇等: "集成运算放大器非线性应用的一点研究", 《商情 财经研究》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048839A (en) * | 2015-08-27 | 2015-11-11 | 无锡伊佩克科技有限公司 | Vehicle-mounted power supply driving circuit |
| CN106645881A (en) * | 2016-11-25 | 2017-05-10 | 佛山科学技术学院 | Detection circuit capable of tracking peak value |
| CN109100564A (en) * | 2017-06-21 | 2018-12-28 | 浙江大华技术股份有限公司 | A kind of signal fluctuation detection circuit |
| US11196408B2 (en) | 2017-06-21 | 2021-12-07 | Zhejiang Dahua Technology Co., Ltd. | System and method for mixed transmission of signals and power supply through a single cable |
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Application publication date: 20140507 |