CN202794312U - Alternating current power failure detecting circuit - Google Patents
Alternating current power failure detecting circuit Download PDFInfo
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- CN202794312U CN202794312U CN 201220386846 CN201220386846U CN202794312U CN 202794312 U CN202794312 U CN 202794312U CN 201220386846 CN201220386846 CN 201220386846 CN 201220386846 U CN201220386846 U CN 201220386846U CN 202794312 U CN202794312 U CN 202794312U
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- alternating current
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- power failure
- current power
- detecting circuit
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Abstract
The utility model discloses an alternating current power failure detecting circuit, and relates to the technical field of measure of electrical variable, which comprises an alternating current access circuit, a conversion circuit for converting alternating current into a square wave pulse voltage and a detecting circuit for detecting received pulse quantity, wherein the alternating current access circuit comprises resistors R1 and R2 and a switch diode D1; the resistors R1 and R2 are connected in parallel and are connected with the switch diode D1 in series; both ends of the switch diode D1 are connected with the input end of the conversion circuit; and the output end of the conversion circuit is connected with the input end of the detecting circuit. According to the alternating current power failure detecting circuit, the technical problems of complex detecting method, slow response speed and high manufacturing cost of the power failure detecting circuit of the prior art are solved; and the alternating current power failure detecting circuit has the advantages that: a rectifier bridge and a filter capacitor are not used to rectify and filter, so power consumption of the circuit is reduced, and the alternating current power failure detecting circuit is direct in detecting method, simple and reliable in circuit, few in adopted element, rapid in response speed and lower in manufacturing cost.
Description
Technical field
The utility model relates to a kind of technical field of measuring electric variable, especially relates to a kind of testing circuit of alternating current power failure.
Background technology
One of shuttleless loom that present weaving loom industry is the most frequently used is rapier loom.Along with the development of rapier loom design, manufacturing and application, the control system that is complementary with it is also more and more perfect.Be provided with circuit board, the hardware device of control loom difference in functionality in the used control rack of Rapier Loom Control System, and the control system that corresponding software burning is formed after corresponding circuit board or man-machine dialog interface.The utilization of these opertaing devices has alleviated workman's labour intensity widely, even can accomplish unmanned.And these opertaing devices and control system are by mains powered.The whether normal normal operation that is directly connected to loom of power supply.This means the continuity of power supply is had relatively high expectations, increased the demand of power-supply management system.Namely only have the unusual of timely detection power supply, just can protect accordingly operation.Chinese patent Granted publication CN201828602U, on May 11 2011 Granted publication date, name is called the utility model patent of " power failure detection circuit with low power consumption ", discloses a kind of power-fail detection circuit.It comprises capacitor C 1, resistance R 2, resistance R 3, zener diode Z1 and optocoupler U1.Capacitor C 1 one ends link to each other with resistance R 2.Resistance R 2 links to each other with resistance R 3.Resistance R 3 and zener diode Z1 link to each other with the input end of optocoupler U1 respectively.This power-fail detection circuit carries out step-down, rectification, filtering to voltage first, is converted to square wave pulse voltage through optocoupler again, and then detects.Such detection method more complicated, response speed is slow, and circuit cost is high.
Summary of the invention
In order to solve the technical matters that power-fail detection circuit detection method in the prior art is complicated, response speed is slow and manufacturing cost is high, the utility model provides that a kind of detection method is simple, the alternating current power failure testing circuit of fast response time and low-power consumption.
The technical solution of the utility model is: a kind of alternating current power failure testing circuit, it is characterized in that, it comprises the alternating current place in circuit, alternating current is converted to the change-over circuit of square wave pulse voltage and the testing circuit that detection receives pulse number, the alternating current place in circuit comprises resistance R 1, R2 and switching diode D1, contact mutually with switching diode D1 after resistance R 1, the R2 parallel connection, the two ends of switching diode D1 are connected with the input end of change-over circuit, and the output terminal of change-over circuit is connected with the input end of testing circuit.Do not need rectifier bridge, filter capacitor to carry out rectification, filtering, reduce the power consumption of circuit.Circuit uses components and parts few, fast response time, low cost of manufacture.
As preferably, testing circuit is single-chip microcomputer; Timer counting in the singlechip chip detects the pulse number that receives in sense cycle, then judge whether power down.
As preferably, change-over circuit is photo-coupler Q1, and the input end of photo-coupler Q1 is in parallel with switching diode D1, and the output terminal of photo-coupler Q1 is connected with single-chip microcomputer; Alternating current is converted to square wave pulse voltage.
As preferably, switching diode D1 model is IN4148; Fast response time, cost is low.
Compared with prior art, the beneficial effects of the utility model are: carry out rectification, filtering without rectifier bridge, filter capacitor, reduce the power consumption of circuit.Detection method is direct, circuit is simple and reliable, uses components and parts few, and fast response time, manufacturing cost are lower.
Description of drawings
Accompanying drawing 1 is a kind of electrical connection synoptic diagram of the present utility model.
Among the figure: 1-alternating current place in circuit; The 2-change-over circuit; The 3-testing circuit.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1:
As shown in Figure 1, a kind of alternating current power failure testing circuit, it comprises alternating current place in circuit 1, alternating current is converted to the change-over circuit 2 of square wave pulse voltage and detects the testing circuit 3 that receives pulse number.Alternating current place in circuit 1 comprises resistance R 1, R2 and switching diode D1.Be in series with switching diode D1 after resistance R 1, the R2 parallel connection.Switching diode D1 model is IN4148.Resistance R 1, R2 parallel connection are as bleeder circuit, and an end of bleeder circuit is the incoming end of electric power-fail detection circuit, and the other end of bleeder circuit is connected with the output terminal of switching diode D1 forward conduction.The two ends of switching diode D1 are connected with the input end of change-over circuit 2.Change-over circuit 2 is photo-coupler Q1.The model of photo-coupler Q1 is TLP181.The input end of photo-coupler Q1 is in parallel with switching diode D1.The output terminal of change-over circuit 2 is connected with the input end of testing circuit 3.Testing circuit 3 is single-chip microcomputer.The model of single-chip microcomputer is STM32F103ZDT6.The output terminal of photo-coupler Q1 is connected with single-chip microcomputer.The output terminal of photo-coupler Q1 is connected with the 34th pin of single-chip microcomputer STM32F103ZDT6.
Behind the alternating current access power-fail detection circuit, through parallel resistance R1, R2 shunting, pass through again switching diode D1.Utilize the characteristic of the conducting of switching diode D1 forward voltage, reverse voltage cut-off, the photo-coupler Q1 that had connect after both having protected prevents that reverse voltage from causing damage to photo-coupler Q1, detects again the sine wave of the positive half cycle of alternating current.Photo-coupler Q1 is converted to square wave pulse voltage with the sine wave of the positive half cycle of alternating current, then exports to single-chip microcomputer.Single-chip microcomputer detects the pulse number that receives by the counting of the timer in the chip in sense cycle.If sense cycle can detect same pulse again, then the expression power supply is normal, enters new sense cycle; If do not detect again same pulse in the sense cycle, then be judged to be power down.In order to improve the accuracy of detection, prevent from causing wrong report because sense cycle is too small, sense cycle can be adjusted by the software in the singlechip chip.
Claims (5)
1. alternating current power failure testing circuit, it is characterized in that, it comprises alternating current place in circuit (1), alternating current is converted to the change-over circuit (2) of square wave pulse voltage and detects the testing circuit (3) that receives pulse number, described alternating current place in circuit (1) comprises resistance R 1, R2 and switching diode D1, be in series with switching diode D1 after resistance R 1, the R2 parallel connection, the two ends of switching diode D1 are connected with the input end of change-over circuit (2), and the output terminal of change-over circuit (2) is connected with the input end of testing circuit (3).
2. a kind of alternating current power failure testing circuit according to claim 1, it is characterized in that: described testing circuit (3) is single-chip microcomputer.
3. a kind of alternating current power failure testing circuit according to claim 1 and 2, it is characterized in that: change-over circuit (2) is photo-coupler Q1, and the input end of photo-coupler Q1 is in parallel with switching diode D1, and the output terminal of photo-coupler Q1 is connected with single-chip microcomputer.
4. a kind of alternating current power failure testing circuit according to claim 1, it is characterized in that: described switching diode D1 model is IN4148.
5. a kind of alternating current power failure testing circuit according to claim 3, it is characterized in that: described switching diode D1 model is IN4148.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220386846 CN202794312U (en) | 2012-08-07 | 2012-08-07 | Alternating current power failure detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220386846 CN202794312U (en) | 2012-08-07 | 2012-08-07 | Alternating current power failure detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202794312U true CN202794312U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220386846 Expired - Fee Related CN202794312U (en) | 2012-08-07 | 2012-08-07 | Alternating current power failure detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202794312U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595951A (en) * | 2020-10-29 | 2021-04-02 | 华帝股份有限公司 | Compatible detection circuit and zero-crossing detection, gate detection and power failure memory detection method thereof |
-
2012
- 2012-08-07 CN CN 201220386846 patent/CN202794312U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595951A (en) * | 2020-10-29 | 2021-04-02 | 华帝股份有限公司 | Compatible detection circuit and zero-crossing detection, gate detection and power failure memory detection method thereof |
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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: 20130313 Termination date: 20210807 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |