CN204287287U - Alternating current signal detection circuit - Google Patents

Alternating current signal detection circuit Download PDF

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Publication number
CN204287287U
CN204287287U CN201420293298.5U CN201420293298U CN204287287U CN 204287287 U CN204287287 U CN 204287287U CN 201420293298 U CN201420293298 U CN 201420293298U CN 204287287 U CN204287287 U CN 204287287U
Authority
CN
China
Prior art keywords
alternating current
detection circuit
signal detection
current signal
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420293298.5U
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Chinese (zh)
Inventor
高宝
张燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI I-TEC INFORMATION TECHNOLOGY Co Ltd
Original Assignee
SHANGHAI I-TEC INFORMATION TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to CN201420293298.5U priority Critical patent/CN204287287U/en
Application granted granted Critical
Publication of CN204287287U publication Critical patent/CN204287287U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of highly versatile, structure simple, account for the alternating current signal detection circuit that PCB surface amasss little, low-power consumption, low cost, be suitable for mechanical temperature controller start-stop input, door switch input, defrosting settling signal detect.For exist in existing alternating current signal detection circuit can only select that one detects to live wire end and zero line side, circuit power consumption is large, account for the shortcoming that PCB surface is amassed greatly, cost is high, the utility model carries out dividing potential drop current limliting and voltage clamp to the most frequently used civil power thus reaches the object detected AC signal.The components and parts used in circuit are all conventional components and parts, can not be designed person easily and grasp and apply in actual design.

Description

Alternating current signal detection circuit
Art
The utility model relates to a kind of new alternating current signal detection circuit, is suitable in the application of mechanical temperature controller start-stop input, door switch input, the detection of defrosting settling signal.
Background technology
At present, the main components of known alternating current signal detection circuit is combined by diode, optocoupler, current-limiting resistance, pull-up resistor, filter capacitor.Mains 220V is accessed the input end of this circuit, can produce a dutycycle at the output terminal of circuit is 50%, and frequency is that the square-wave signal of 50Hz sends single-chip microcomputer to and finally completes detection.General alternating current signal detection circuit can only be selected one to live wire and zero line and detect, have circuit power consumption large, account for the shortcoming that PCB surface is amassed extensively, cost is high.
Summary of the invention
In order to overcome the above-mentioned shortcoming of existing alternating current signal detection circuit, the utility model provides a kind of alternating current signal detection circuit.Compare with available circuit, the utility model function is more comprehensive: live wire and zero line can simple as input source, structure, account for PCB surface amass little, power consumption is little, device cost is low, processing cost is low.
The utility model solves the technical scheme that its technical matters adopts: the live wire end of power input or zero line side are connected with current-limiting resistor voltage divider, detection signal clamped down in the safe range of bearing in monolithic function by diode, send single-chip microcomputer to and finally form detection to AC signal.Described alternating current signal detection circuit comprise current-limiting resistor voltage divider, voltage source, diode, filter capacitor, pull-up resistor, the power wherein for current-limiting resistor voltage divider is 2 1/4W resistance and 1 1/10W resistance respectively; Need adopt schottky diode for the diode of Clamping voltages in circuit, the model used in existing circuit is BAT54, and the schottky diode of other models can be used to substitute.At described circuit in cases of a disturbance, need to add filter capacitor between the output terminal and GND of detection signal.
The beneficial effects of the utility model be amass with the simplest structure, minimum PCB surface, minimum power consumption, minimum device cost detect this task of AC signal more comprehensively with being processed into originally to complete, structure is simple.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 power supply the principle figure of the present utility model, supply voltage must be same supply network with live wire/zero line.
Fig. 3 the utility model PCB layout figure.
Pcb board in Fig. 4 practice
The components and parts irised out are the utility model alternating current signal detection circuit in practice.
In Fig. 1: 1. mains electricity input end live wire or zero line.2. current-limiting resistor voltage divider R1, parameter is: 510K/1/4W.3. current-limiting resistor voltage divider R2, parameter is: 510K/1/4W.4. schottky diode D1, parameter is: BAT54.5. current-limiting resistor voltage divider R3, parameter is: 30K/1/10W.6. pull-up resistor R4, parameter is: 330K/1/10W.7. filter capacitor C1, parameter is: 1000P/50V.8. voltage source, parameter is :+5V.9. GND.10.RXD holds, single-chip microcomputer receiving end.
Embodiment
In Fig. 1: mains electricity input end live wire end or zero line side are connected with resistance R1, resistance R2, formation dividing potential drop is connected to the ground through resistance R3, be connected with voltage source through schottky diode D1 subsequently, in parallel with pull-up resistor R4 again, connect a filter capacitor C1 between detection signal with GND, and final output waveform is connected with the input end of single-chip microcomputer.
Remarks:
Voltage source please accesses the supply voltage of other single-chip microcomputers according to actual conditions, common microcontroller power supply voltage has+3.3V ,+5V, is all applicable to the utility model, but must ensure that the live wire of voltage source and this circuit and zero line are same supply network.
Ground GND and single-chip microcomputer are altogether.
Diode D1 needs to use schottky diode, utilizes its forward conduction voltage this characteristic little.
In reality debugging, find that the waveform detecting AC signal exists burr, need the filter capacitor C1 that connects between detection signal with GND.
Creepage distance is please noted during wiring.
Current-limiting resistor voltage divider please select the resistance that can work under operating voltage 220V.

Claims (4)

1. alternating current signal detection circuit, is characterized in that: described alternating current signal detection circuit comprise current-limiting resistor voltage divider, voltage source, diode, filter capacitor, pull-up resistor; The live wire end of power input or zero line side are connected with current-limiting resistor voltage divider, to be clamped down on by detection signal in the safe range of bearing in monolithic function by diode, send single-chip microcomputer to and finally form detection to AC signal.
2. alternating current signal detection circuit according to claim 1, is characterized in that: be 2 1/4W resistance and 1 1/10W resistance respectively for the power of current-limiting resistor voltage divider in described circuit.
3. alternating current signal detection circuit according to claim 1, it is characterized in that: in described circuit, need schottky diode be adopted for the diode of Clamping voltages, the model used in existing circuit is BAT54, and the schottky diode of other models can be used to substitute.
4. alternating current signal detection circuit according to claim 1, is characterized in that: described circuit in cases of a disturbance, needs to add filter capacitor between the output terminal and GND of detection signal.
CN201420293298.5U 2014-06-04 2014-06-04 Alternating current signal detection circuit Expired - Fee Related CN204287287U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420293298.5U CN204287287U (en) 2014-06-04 2014-06-04 Alternating current signal detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420293298.5U CN204287287U (en) 2014-06-04 2014-06-04 Alternating current signal detection circuit

Publications (1)

Publication Number Publication Date
CN204287287U true CN204287287U (en) 2015-04-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420293298.5U Expired - Fee Related CN204287287U (en) 2014-06-04 2014-06-04 Alternating current signal detection circuit

Country Status (1)

Country Link
CN (1) CN204287287U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414824A (en) * 2018-01-31 2018-08-17 浙江南都电源动力股份有限公司 A kind of electric current detecting method and device
CN109298323A (en) * 2018-08-15 2019-02-01 安徽宏远仪表有限公司 A kind of low power consumption switch detection circuit
CN112202350A (en) * 2020-09-04 2021-01-08 武汉宝久创美科技有限公司 Power supply voltage switching device and voltage switching method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414824A (en) * 2018-01-31 2018-08-17 浙江南都电源动力股份有限公司 A kind of electric current detecting method and device
CN108414824B (en) * 2018-01-31 2020-06-23 浙江南都电源动力股份有限公司 Current detection method and device
CN109298323A (en) * 2018-08-15 2019-02-01 安徽宏远仪表有限公司 A kind of low power consumption switch detection circuit
CN112202350A (en) * 2020-09-04 2021-01-08 武汉宝久创美科技有限公司 Power supply voltage switching device and voltage switching method thereof

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150422

Termination date: 20160604

CF01 Termination of patent right due to non-payment of annual fee