CN204422636U - Alternating current signal detection circuit - Google Patents
Alternating current signal detection circuit Download PDFInfo
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- CN204422636U CN204422636U CN201520134059.XU CN201520134059U CN204422636U CN 204422636 U CN204422636 U CN 204422636U CN 201520134059 U CN201520134059 U CN 201520134059U CN 204422636 U CN204422636 U CN 204422636U
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- coupler
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- voltage circuit
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Abstract
The utility model provides a kind of alternating current signal detection circuit, comprises reduction voltage circuit and photo-coupler U; Reduction voltage circuit comprises the first diode D1 and the second diode D2 that are arranged in series, the anode of the first diode D1 is configured to as the first end of reduction voltage circuit the first end connecting AC power, the negative electrode of the first diode D1 connects the anode of the second diode D2, and the negative electrode of the second diode D2 is configured to as the second end of reduction voltage circuit the second end connecting AC power; The first input end of photo-coupler U connects the first end of reduction voltage circuit, second input end of photo-coupler U connects the second end of reduction voltage circuit, first output head grounding of photo-coupler U, second output terminal of photo-coupler U is configured to connect direct supply, and second output terminal of photo-coupler U is as detection signal end.Alternating current signal detection circuit of the present utility model, reduces the cost of this alternating current signal detection circuit, and structure is simple, and the signal of output is digital signal, is convenient to monitoring.
Description
Technical field
The utility model relates to testing circuit technical field, particularly relates to a kind of alternating current signal detection circuit.
Background technology
General many employing D.C mutual-inductors realize the detection to AC signal, but the cost of D.C mutual-inductor is high, equipment weight, is unfavorable for extensively promoting the use of.
Utility model content
In view of the present situation of prior art, the purpose of this utility model is to provide a kind of alternating current signal detection circuit, and structure is simple, reduces the cost of alternating current signal detection, is convenient to widely use.
For achieving the above object, the utility model adopts following technical scheme:
A kind of alternating current signal detection circuit, comprises reduction voltage circuit and photo-coupler U;
Described reduction voltage circuit comprises the first diode D1 and the second diode D2 that are arranged in series, the anode of described first diode D1 is configured to as the first end of described reduction voltage circuit the first end connecting AC power, the negative electrode of described first diode D1 connects the anode of described second diode D2, and the negative electrode of described second diode D2 is configured to as the second end of described reduction voltage circuit the second end connecting AC power;
The first input end of described photo-coupler U connects the first end of described reduction voltage circuit, second input end of described photo-coupler U connects the second end of described reduction voltage circuit, first output head grounding of described photo-coupler U, second output terminal of described photo-coupler U is configured to connect direct supply, and second output terminal of described photo-coupler U is as detection signal end.
Wherein in an embodiment, also comprise mu balanced circuit, described mu balanced circuit and described reduction voltage circuit are arranged in parallel.
Wherein in an embodiment, described mu balanced circuit comprises the 3rd diode D3, and the anode of described 3rd diode D3 connects the first end of described reduction voltage circuit, and the negative electrode of described 3rd diode D3 connects the second end of described reduction voltage circuit.
Wherein in an embodiment, also comprise current-limiting resistance R1, described current-limiting resistance R1 is connected between the first end of described reduction voltage circuit and the first input end of described photo-coupler U.
Wherein in an embodiment, the Standard resistance range of described current-limiting resistance R1 is 1000 ohm ± 100 ohm.
Wherein in an embodiment, also comprise pull-up resistor R2; Between the second output terminal that described pull-up resistor R2 is connected on described photo-coupler U and described direct supply.
The beneficial effects of the utility model are:
Alternating current signal detection circuit of the present utility model, the reduction voltage circuit formed by the first diode of being arranged in series and the second diode and photo-coupler U are detected alternating current, when there being AC signal to pass through, photo-coupler U conducting, input end output low level, when passing through without AC signal, photo-coupler U ends, input end exports high level, realizes the detection to AC signal.Due to, this alternating current signal detection circuit does not use D.C mutual-inductor, therefore, reduces the cost of this alternating current signal detection circuit, is convenient to widely use.And the structure of this alternating current signal detection circuit is simple, and the signal of output is digital signal, is convenient to monitoring.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of alternating current signal detection circuit one embodiment of the present utility model;
Fig. 2 is the output waveform figure of alternating current signal detection circuit in Fig. 1.
Embodiment
In order to make the technical solution of the utility model clearly, below in conjunction with accompanying drawing, alternating current signal detection circuit of the present utility model is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the utility model and to be not used in restriction the utility model.
As shown in Figure 1, alternating current signal detection circuit of the present utility model comprises reduction voltage circuit, mu balanced circuit, photo-coupler U, current-limiting resistance R1 and pull-up resistor R2.Wherein, reduction voltage circuit comprises the first diode D1 and the second diode D2 that are arranged in series.Particularly, the anode of the first diode D1 is configured to as the first end of reduction voltage circuit the first end OT1 connecting AC power, the negative electrode of the first diode D1 connects the anode of the second diode D2, and the negative electrode of the second diode D2 is configured to as the second end of reduction voltage circuit the second end OT2 connecting AC power.
Photo-coupler U in the present embodiment has two input ends and two output terminals, and two input ends are respectively first input end 1 and the second input end 2, two output terminals are respectively the first output terminal 3 and the second output terminal 4.Wherein, the first input end 1 of photo-coupler U connects the first end of reduction voltage circuit, second input end 2 of photo-coupler U connects the second end of reduction voltage circuit, first output terminal 3 ground connection of photo-coupler U, second output terminal 4 of photo-coupler U is configured to connect direct supply VCC, and second output terminal 4 of photo-coupler U is as detection signal end.Photo-coupler U serves the effect of isolation signals conduction, achieves the electrical isolation of output terminal and input end, makes the antijamming capability of this alternating current signal detection circuit strong, stable work in work.
More preferably, mu balanced circuit and reduction voltage circuit are arranged in parallel, and in the present embodiment, mu balanced circuit comprises the 3rd diode D3 for voltage stabilizing.Particularly, the anode of the 3rd diode D3 connects the first end of reduction voltage circuit, and the negative electrode of the 3rd diode D3 connects the second end of reduction voltage circuit.
More preferably, current-limiting resistance R1 is connected between the first end of reduction voltage circuit and the first input end 1 of photo-coupler U, and the electric current of current-limiting resistance R1 restricted passage photo-coupler U, avoids burning of photo-coupler U.In the present embodiment, the Standard resistance range of current-limiting resistance R1 is preferably 1000 ohm ± 100 ohm.Pull-up resistor R2 is connected between second output terminal 4 of photo-coupler U and direct supply VCC, makes second output terminal 4 of photo-coupler U can the high level of stable output, the stability of intensifier circuit.
The specific works principle of alternating current signal detection circuit of the present utility model is as follows:
When have AC signal by time, clamper, now the magnitude of voltage U at the light emitting diode two ends of photo-coupler U after the first diode D1 and the second diode D2 conducting
aKequal the pressure drop of the first diode and the pressure drop sum U of the second diode
ab, make the LEDs ON of photo-coupler U and luminous, the phototriode of photo-coupler U is subject to conducting after illumination, and such AC signal conducts to detection signal end OP2 by photo-coupler U.After photo-coupler U conducting, the output terminal of photo-coupler U is equivalent to pull-up resistor R2 and is connected between direct supply VCC and ground wire GND, and therefore, the output voltage of detection signal end OP2 approximates 0V, i.e. detection signal end OP2 output low level.
When passing through without AC signal, the first diode D1 and the second diode D2 ends, and now the light emitting diode cut-off of photo-coupler U, not luminous, and then the phototriode of photo-coupler U is ended, photo-coupler U not conducting.Now, the output terminal of photo-coupler U is equivalent to detection signal end OP2 and connects after pull-up resistor R2 and be connected directly to direct supply VCC, and therefore, the output voltage of detection signal end OP2 approximates the voltage VCC of direct supply, and namely detection signal end exports high level.
As shown in Figure 2, when the output voltage of detection signal end OP2 is low level, illustrated that AC signal is passed through.When the output voltage of detection signal end OP2 is high level, illustrates and to pass through without AC signal, realize the detection to AC signal.What deserves to be explained is, the signal that the detection signal end OP2 of this alternating current signal detection circuit exports is digital signal, is convenient to monitoring.
Alternating current signal detection circuit of the present utility model, the reduction voltage circuit formed by the first diode of being arranged in series and the second diode and photo-coupler are detected alternating current, when there being AC signal to pass through, photo-coupler conducting, input end output low level, when passing through without AC signal, photo-coupler ends, input end exports high level, realizes the detection to AC signal.Due to, this alternating current signal detection circuit does not use D.C mutual-inductor, therefore, reduces the cost of this alternating current signal detection circuit, is convenient to widely use.And the structure of this alternating current signal detection circuit is simple, and the signal of output is digital signal, is convenient to monitoring.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (6)
1. an alternating current signal detection circuit, is characterized in that, comprises reduction voltage circuit and photo-coupler U;
Described reduction voltage circuit comprises the first diode D1 and the second diode D2 that are arranged in series, the anode of described first diode D1 is configured to as the first end of described reduction voltage circuit the first end connecting AC power, the negative electrode of described first diode D1 connects the anode of described second diode D2, and the negative electrode of described second diode D2 is configured to as the second end of described reduction voltage circuit the second end connecting AC power;
The first input end of described photo-coupler U connects the first end of described reduction voltage circuit, second input end of described photo-coupler U connects the second end of described reduction voltage circuit, first output head grounding of described photo-coupler U, second output terminal of described photo-coupler U is configured to connect direct supply, and second output terminal of described photo-coupler U is as detection signal end.
2. alternating current signal detection circuit according to claim 1, is characterized in that, also comprise mu balanced circuit, and described mu balanced circuit and described reduction voltage circuit are arranged in parallel.
3. alternating current signal detection circuit according to claim 2, it is characterized in that, described mu balanced circuit comprises the 3rd diode D3, and the anode of described 3rd diode D3 connects the first end of described reduction voltage circuit, and the negative electrode of described 3rd diode D3 connects the second end of described reduction voltage circuit.
4. alternating current signal detection circuit according to claim 3, is characterized in that, also comprises current-limiting resistance R1, and described current-limiting resistance R1 is connected between the first end of described reduction voltage circuit and the first input end of described photo-coupler U.
5. alternating current signal detection circuit according to claim 4, is characterized in that, the Standard resistance range of described current-limiting resistance R1 is 1000 ohm ± 100 ohm.
6. the alternating current signal detection circuit according to any one of claim 1-5, is characterized in that, also comprises pull-up resistor R2; Between the second output terminal that described pull-up resistor R2 is connected on described photo-coupler U and described direct supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520134059.XU CN204422636U (en) | 2015-03-10 | 2015-03-10 | Alternating current signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520134059.XU CN204422636U (en) | 2015-03-10 | 2015-03-10 | Alternating current signal detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204422636U true CN204422636U (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520134059.XU Expired - Fee Related CN204422636U (en) | 2015-03-10 | 2015-03-10 | Alternating current signal detection circuit |
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| CN (1) | CN204422636U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828140A (en) * | 2019-02-15 | 2019-05-31 | 杭州老板电器股份有限公司 | Electric current value calculating method, device and electronic equipment |
-
2015
- 2015-03-10 CN CN201520134059.XU patent/CN204422636U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828140A (en) * | 2019-02-15 | 2019-05-31 | 杭州老板电器股份有限公司 | Electric current value calculating method, device and electronic equipment |
| CN109828140B (en) * | 2019-02-15 | 2021-09-24 | 杭州老板电器股份有限公司 | Current value calculation method and device and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170522 Address after: 276500 No. 99 middle Weifang Road, Juxian Economic Development Zone, Shandong, Rizhao City Patentee after: Shandong living things networking technology Co., Ltd. Address before: 276826 Fuyang Road, Donggang District, Shandong, north section of No. 96, No. Patentee before: Huodian Information Technology Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20180310 |
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| CF01 | Termination of patent right due to non-payment of annual fee |