CN204068901U - A kind of in-phase synchronization pulse-detecting circuit - Google Patents
A kind of in-phase synchronization pulse-detecting circuit Download PDFInfo
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- CN204068901U CN204068901U CN201420033364.5U CN201420033364U CN204068901U CN 204068901 U CN204068901 U CN 204068901U CN 201420033364 U CN201420033364 U CN 201420033364U CN 204068901 U CN204068901 U CN 204068901U
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- operational amplifier
- hysteresis comparator
- resistance
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- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 230000010363 phase shift Effects 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- IXORZMNAPKEEDV-OBDJNFEBSA-N gibberellin A3 Chemical compound C([C@@]1(O)C(=C)C[C@@]2(C1)[C@H]1C(O)=O)C[C@H]2[C@]2(C=C[C@@H]3O)[C@H]1[C@]3(C)C(=O)O2 IXORZMNAPKEEDV-OBDJNFEBSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of in-phase synchronization pulse-detecting circuit, be made up of amplifying circuit and hysteresis comparator circuit, wherein, described amplifying circuit comprises operational amplifier U1, detected signal enters the input of described operational amplifier U1 by series resistance R1, this input is connected with the output of described operational amplifier U1 by resistance R2, the 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 the input of hysteresis comparator U2 by resistance R4, and finally detected signal is detected by hysteresis comparator U2 and exports from output.Testing circuit of the present utility model effectively can reduce the impact that ripple, interference etc. detect zero cross signal, has the advantage that phase shift variations is little, antijamming capability is strong, can be widely used in being with in the voltage and current signal zero passage detection of ripple.
Description
Technical field
The utility model relates to a kind of zero passage signal detection circuit, particularly relates to a kind of in-phase synchronization pulse-detecting circuit.
Background technology
In voltage and current signal zero passage detection, the Cleaning 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, containing high order harmonic component in the voltage signal that sampling obtains, voltage zero-crossing signal has repeatedly zero crossing near zero-crossing point.Also this phenomenon is there will be because nonlinear load increases in modern power network.If directly detected this signal, multiple zero crossing will be obtained, the effective detection to electrical network zero cross signal cannot be reached.Conventional way uses hysteresis comparator, and use a threshold voltage to eliminate the humorous wave interference of zero crossing, the method can cause phase shift in various degree along with detected varying in size of voltage, affects the precision that rear class controls.
Utility model content
The purpose of this utility model is to provide the zero passage signal detection circuit that a kind of phase shift variations is little, antijamming capability is strong.
The utility model realizes like this, a kind of in-phase synchronization pulse-detecting circuit, be made up of amplifying circuit and hysteresis comparator circuit, it is characterized in that: described amplifying circuit comprises operational amplifier U1, detected signal enters the input of described operational amplifier U1 by series resistance R1, this input is connected with the output of described operational amplifier U1 by resistance R2, the 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 the input of hysteresis comparator U2 by resistance R4, and finally detected signal is detected 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 R6 simultaneously, can reduce the phase shift variations of detected signal further.
The beneficial effects of the utility model are: by introducing a regulex between hysteresis comparator and detected signal, utilize the device property of operational amplifier own, the harmonic signal impact of direct elimination zero crossing annex, significantly can reduce the different and difference that causes of different detected signal amplitude simultaneously.Effectively can reduce the impact that ripple, interference etc. detect zero cross signal, there is the advantage that phase shift variations is little, antijamming capability is strong, can be widely used in being with in the voltage and current signal zero passage detection of ripple.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
U1 in the drawings-operational amplifier U2-hysteresis comparator R1, R2, R3, R4, R5, R6-resistance VCC-power supply.
Embodiment
In order to make content of the present utility model more easily be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in the figure, a kind of in-phase synchronization pulse-detecting circuit, be made up of signal amplification circuit and hysteresis comparator circuit, wherein, described signal amplification circuit comprises operational amplifier U1, detected signal enters the input of described operational amplifier U1 by series resistance R1, this input is connected with the output of described operational amplifier U1 by resistance R2, the 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 the input of hysteresis comparator U2 by resistance R4, and finally detected signal is detected 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 R6 simultaneously, can reduce the phase shift variations of detected signal further.
Operational amplifier U1 and hysteresis comparator U2 all switches on power work, and input signal first carries out saturation amplification through a saturation arithmetic amplifier U1, more again anti-phase through hysteresis comparator U2, obtains the synchronous synchronization zero-cross pulse signal with input signal.Namely 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, then 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 being detected the filtering of signal high order harmonic component without phase shift ground in this way.Through saturation amplification circuit waveform out close to square wave, again through hysteresis comparator U2, then the phase shift variations of detected signal reduces greatly, and does not substantially change with the amplitude of detected signal, achieves the high precision test of detected signal zero crossing.
Claims (4)
1. an in-phase synchronization pulse-detecting circuit, be made up of amplifying circuit and hysteresis comparator circuit, it is characterized in that: described amplifying circuit comprises operational amplifier U1, detected signal enters the input of described operational amplifier U1 by series resistance R1, this input is connected with the output of described operational amplifier U1 by resistance R2, the 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 the input of hysteresis comparator U2 by resistance R4, and finally detected signal is detected 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 R6 simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420033364.5U CN204068901U (en) | 2014-01-20 | 2014-01-20 | A kind of in-phase synchronization pulse-detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420033364.5U CN204068901U (en) | 2014-01-20 | 2014-01-20 | A kind of in-phase synchronization pulse-detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068901U true CN204068901U (en) | 2014-12-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420033364.5U Expired - Lifetime CN204068901U (en) | 2014-01-20 | 2014-01-20 | A kind of in-phase synchronization pulse-detecting circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204068901U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780234A (en) * | 2014-01-20 | 2014-05-07 | 江西清华泰豪三波电机有限公司 | In-phase synchronous pulse detection circuit |
-
2014
- 2014-01-20 CN CN201420033364.5U patent/CN204068901U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780234A (en) * | 2014-01-20 | 2014-05-07 | 江西清华泰豪三波电机有限公司 | In-phase synchronous pulse detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141231 |