CN202512159U - Peak value momentary detecting circuit for alternating-current voltage - Google Patents
Peak value momentary detecting circuit for alternating-current voltage Download PDFInfo
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- CN202512159U CN202512159U CN2012201807743U CN201220180774U CN202512159U CN 202512159 U CN202512159 U CN 202512159U CN 2012201807743 U CN2012201807743 U CN 2012201807743U CN 201220180774 U CN201220180774 U CN 201220180774U CN 202512159 U CN202512159 U CN 202512159U
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Abstract
The utility model discloses a peak value momentary detecting circuit for an alternating-current voltage. The peak value momentary detecting circuit comprises a voltage dropping circuit, a rectification circuit, an adder circuit and a comparer circuit; the voltage dropping circuit comprises a resistor R1 and a resistor R2; the rectification circuit comprises a diode D1 and a capacitor C1; the adder circuit comprises resistors R3-R8 and an operational amplifier U1B; the comparer circuit comprises an operational amplifier U1A; an out-phase input end of the operational amplifier U1A is connected onto an output end of the operational amplifier U1B; and an in-phase input end of the operational amplifier U1A is connected onto a common end between the resistor R1 and the resistor R2. The peak value momentary detecting circuit for the alternating-current voltage, which is provided by the utility model, has the advantages that the structure of the circuit can be simplified, the cost of the circuit can be reduced, further, the matching of software is not needed, and the like.
Description
Technical field
The utility model relates to a kind of alternating voltage peak testing circuit constantly.
Background technology
For the peak value detection constantly of alternating voltage, conventional method is, is industry or civilian AC voltage conversion small voltage through voltage transformer (VT) at present; The low-pass filter circuit of forming through operational amplifier then after the filtering high frequency noise signal, is delivered to the analog digital sample circuit; Digital signal after obtaining to sample; By MCU digital signal being compared computing then, when obtaining maximum sampled value this moment, is exactly the needed alternating voltage peak moment.The alternating voltage peak of this routine weakness of detection method constantly is: complicated circuit, cost is high, needs software and hardware to cooperate.
The utility model content
The utility model is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of alternating voltage peak testing circuit constantly is provided, to simplify circuit structure, to reduce circuit cost.
The utility model adopts following technical scheme for the technical solution problem.
Alternating voltage peak is testing circuit constantly, and its design feature is to comprise reduction voltage circuit, rectification circuit, adder circuit and comparator circuit;
Said reduction voltage circuit comprises resistance R 1 and resistance R 2; Said resistance R 1 is in series afterwards with resistance R 2, and two ends are connected with the two ends of socket;
Said rectification circuit comprises diode D1 and capacitor C 1; The end of said diode D1 is connected on the common port between said resistance R 1 and the resistance R 2, and the other end of said diode D1 is connected on the link of resistance R 2 and socket through capacitor C 1;
Adder circuit comprises resistance R 3～R8, operational amplifier U1B; The end of said R3 is connected between diode D1 and the capacitor C 1, and the other end of said R3 is connected on the in-phase input end of operational amplifier U1B; One end of said resistance R 4 is connected on the operational amplifier U1B in-phase input end, and said resistance R 4 other ends are connected on the power supply VCC through resistance R 6; One end of said resistance R 5 is connected between resistance R 4 and the resistance R 6, and the other end of said resistance R 5 is connected on the earth point; One end of said resistance R 7 is connected on the inverting input of operational amplifier U1B, and the other end of resistance R 7 is connected on the output terminal of operational amplifier U1B; One end of said resistance R 8 is connected on the inverting input of operational amplifier U1B, and the other end of resistance R 8 is connected on the earth point;
Said comparator circuit comprises operational amplifier U1A, and on the output terminal of the inverting input of said operational amplifier U1A and said operational amplifier U1B, the in-phase input end of said operational amplifier U1A is connected on the common port between resistance R 1 and the resistance R 2.
The alternating voltage peak of the utility model design feature of testing circuit constantly also is:
Said resistance R 5 is a variohm.
Compared with present technology, the utility model beneficial effect is embodied in:
The testing circuit of the utility model comprises reduction voltage circuit, rectification circuit, adder circuit and comparator circuit, and its circuit form is simple, is the ingenious combination of custom circuit form; Circuit cost is low, and element all is that the most conventional Resistor-Capacitor Unit and universal element calculated amplifier; Circuit is a pure hardware circuit, need not software and cooperates, and saves the development time; Adopt adder circuit that Output Voltage in Rectified Circuits is carried out voltage compensation and can obtain more magnitude of voltage, thereby obtain accurate more alternating voltage peak pulse constantly output near alternating voltage peak.
The alternating voltage peak of the utility model is testing circuit constantly, has can simplify circuit structure, reduce circuit cost and need not advantage such as software cooperation.
Description of drawings
Fig. 1 is the circuit structure diagram of the alternating voltage peak moment testing circuit of the utility model.
Below pass through embodiment, and combine accompanying drawing that the utility model is described further.
Embodiment
Referring to Fig. 1, alternating voltage peak is testing circuit constantly, comprises reduction voltage circuit, rectification circuit, adder circuit and comparator circuit;
Said reduction voltage circuit comprises resistance R 1 and resistance R 2; Said resistance R 1 is in series afterwards with resistance R 2, and two ends are connected with the two ends of socket; One end of said resistance R 1 is connected with a last terminal of AC outlet, and the other end of resistance R 1 is connected with an end of resistance R 2, and the other end of resistance R 2 is connected with the next terminal of AC outlet, and the second terminal ground connection of AC outlet is connected;
Said rectification circuit comprises diode D1 and capacitor C 1; The end of said diode D1 is connected on the common port between said resistance R 1 and the resistance R 2, and the other end of said diode D1 is connected on the link of resistance R 2 and socket through capacitor C 1; After diode D1 and capacitor C 1 series connection, two ends are connected on the two ends of resistance R 2; Because resistance R 1 plays the dividing potential drop effect with R2, the voltage that is added on the rectification circuit is consistent with the voltage at R2 two ends;
Adder circuit comprises resistance R 3～R8, operational amplifier U1B; The end of said R3 is connected between diode D1 and the capacitor C 1, and the other end of said R3 is connected on the in-phase input end of operational amplifier U1B; One end of said resistance R 4 is connected on the operational amplifier U1B in-phase input end, and said resistance R 4 other ends are connected on the power supply VCC through resistance R 6; One end of said resistance R 5 is connected between resistance R 4 and the resistance R 6, and the other end of said resistance R 5 is connected on the earth point; One end of said resistance R 7 is connected on the inverting input of operational amplifier U1B, and the other end of resistance R 7 is connected on the output terminal of operational amplifier U1B; One end of said resistance R 8 is connected on the inverting input of operational amplifier U1B, and the other end of resistance R 8 is connected on the earth point;
Said comparator circuit comprises operational amplifier U1A, and on the output terminal of the inverting input of said operational amplifier U1A and said operational amplifier U1B, the in-phase input end of said operational amplifier U1A is connected on the common port between resistance R 1 and the resistance R 2.
AC power one termination circuit ground level is received on the alternating voltage to be detected in the R1 of reduction voltage circuit, upper end, R2 series connection back through ac voltage socket J1.The upper end alternating voltage V0 of ac voltage socket J1, lower end ground connection.The effect of reduction voltage circuit is that step-down becomes a small voltage signal industry or civilian alternating voltage.
Terminate on the points of common connection between resistance R 1 and the R2 C1 lower end ground connection on the diode D1 of rectification circuit.The effect of rectification circuit is the maximal value that from AC signal, obtains AC signal voltage through rectification.The voltage of exporting on the points of common connection between resistance R 1 and the R2 is V1, and the output voltage of the common point between diode D1 and the C1 is V2.
Adder circuit is made up of R3, R4, R5, R6, R7, R8 and operational amplifier U1B.R5 and R6 carry out dividing potential drop to direct supply voltage VCC, obtain voltage V3.The output V2 process resistance R 3 of voltage V3 process resistance R 4, rectification circuit is added to the in-phase input end of operational amplifier, and R7 and R8 are the amplifier feedback resistance.The effect of adder circuit is Output Voltage in Rectified Circuits and a fixedly DC voltage addition, rectification output that the pressure drop of diode causes in the compensation rectification circuit and the pressure reduction between the alternating voltage maximal value.
Comparator circuit is made up of general-purpose operation amplifier U1A.The operational amplifier U1B output V4 of adder circuit is connected to the in-phase input end of general-purpose operation amplifier, and the output V1 of bleeder circuit is connected to the inverting input of operational amplifier U1A.The effect of comparator circuit is that the instantaneous value of alternating voltage and alternating voltage peak-peak are made comparisons, and when alternating voltage is in the peak value moment, obtains a pulse energizing signal, thereby obtains peak values of ac signal constantly.
Said resistance R 5 is a variohm.
Referring to Fig. 1, alternating voltage V0 in the utility model through R1 and the step-down of R2 resistance, obtains a less alternating voltage V1, and R1 and R2 value need be guaranteed the V1 peak value less than the amplifier U1A in the circuit, the direct-current working volts VCC of U1B.D1, C1 carries out rectification to alternating voltage V1, obtains a DC voltage V2, V2=V1_max-0.6V, wherein V1_max is the peak value of alternating voltage V1,0.6V is the tube voltage drop of diode.R3, R4, R5, R6, R7, R8 and operational amplifier U1B form adder circuit, and the output V2 of rectification circuit is carried out voltage compensation.Wherein R5 and R6 obtain DC voltage V3 to WV VCC dividing potential drop, carry out additive operation and obtain output voltage V 4 through operational amplifier U1B and the R3～totalizer of R8 composition.V4＝V3+V2＝V3+V1_max-0.6V。Adjustment resistance R 5 can make V3 less than and as far as possible near 0.6V, like this, can make V4 less than and very near alternating voltage peak V1_max.Resistance R 3=R4 wherein, R7=R8.
Amplifier U1A forms comparer, compares to the instantaneous value of alternating voltage V1 with through the alternating voltage maximal value V4 of over-compensation, as alternating voltage instantaneous value V1; In the time of less than alternating voltage maximal value V4; The comparer output low level, when alternating voltage instantaneous value V1 is in peak value constantly the time, comparator toggles is a high level; Obtain the moment high level pulse of a time point, thereby detect alternating voltage peak constantly corresponding to alternating voltage peak.
Because adjustment resistance R 5 can make the instantaneous value of alternating voltage maximal value V4 and alternating voltage V1 very approaching, so this circuit can obtain point-device alternating current peak value pulse constantly output.
Claims (2)
1. alternating voltage peak moment testing circuit is characterized in that, comprises reduction voltage circuit, rectification circuit, adder circuit and comparator circuit;
Said reduction voltage circuit comprises resistance R 1 and resistance R 2; Said resistance R 1 is in series afterwards with resistance R 2, and two ends are connected with the two ends of socket;
Said rectification circuit comprises diode D1 and capacitor C 1; The end of said diode D1 is connected on the common port between said resistance R 1 and the resistance R 2, and the other end of said diode D1 is connected on the link of resistance R 2 and socket through capacitor C 1;
Adder circuit comprises resistance R 3～R8, operational amplifier U1B; The end of said R3 is connected between diode D1 and the capacitor C 1, and the other end of said R3 is connected on the in-phase input end of operational amplifier U1B; One end of said resistance R 4 is connected on the operational amplifier U1B in-phase input end, and said resistance R 4 other ends are connected on the power supply VCC through resistance R 6; One end of said resistance R 5 is connected between resistance R 4 and the resistance R 6, and the other end of said resistance R 5 is connected on the earth point; One end of said resistance R 7 is connected on the inverting input of operational amplifier U1B, and the other end of resistance R 7 is connected on the output terminal of operational amplifier U1B; One end of said resistance R 8 is connected on the inverting input of operational amplifier U1B, and the other end of resistance R 8 is connected on the earth point;
Said comparator circuit comprises operational amplifier U1A, and on the output terminal of the inverting input of said operational amplifier U1A and said operational amplifier U1B, the in-phase input end of said operational amplifier U1A is connected on the common port between resistance R 1 and the resistance R 2.
2. alternating voltage peak according to claim 1 is testing circuit constantly, it is characterized in that said resistance R 5 is a variohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201807743U CN202512159U (en) | 2012-04-25 | 2012-04-25 | Peak value momentary detecting circuit for alternating-current voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201807743U CN202512159U (en) | 2012-04-25 | 2012-04-25 | Peak value momentary detecting circuit for alternating-current voltage |
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| Publication Number | Publication Date |
|---|---|
| CN202512159U true CN202512159U (en) | 2012-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201807743U Expired - Fee Related CN202512159U (en) | 2012-04-25 | 2012-04-25 | Peak value momentary detecting circuit for alternating-current voltage |
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| CN (1) | CN202512159U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395165A (en) * | 2016-05-16 | 2017-11-24 | 上海亨骏自动化设备有限公司 | A kind of liquid level gauge echo time collection peak detection circuit |
-
2012
- 2012-04-25 CN CN2012201807743U patent/CN202512159U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395165A (en) * | 2016-05-16 | 2017-11-24 | 上海亨骏自动化设备有限公司 | A kind of liquid level gauge echo time collection peak detection circuit |
| CN107395165B (en) * | 2016-05-16 | 2022-09-09 | 上海亨骏自动化设备有限公司 | Peak detection circuit for acquiring echo time of liquid level meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20121031 Termination date: 20150425 |
|
| EXPY | Termination of patent right or utility model |