CN106338641A - Novel AC voltage detection circuit - Google Patents
Novel AC voltage detection circuit Download PDFInfo
- Publication number
- CN106338641A CN106338641A CN201610730321.6A CN201610730321A CN106338641A CN 106338641 A CN106338641 A CN 106338641A CN 201610730321 A CN201610730321 A CN 201610730321A CN 106338641 A CN106338641 A CN 106338641A
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- CN
- China
- Prior art keywords
- voltage
- circuit
- detection
- input
- output
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to the field of a detection circuit, and especially relates to a novel AC voltage detection circuit, which comprises a current-limiting portion circuit, an AC/DC conversion portion circuit, a reference voltage generation circuit, a voltage comparison portion circuit and a signal detection portion circuit, where the current-limiting portion circuit, the AC/DC conversion portion circuit, the reference voltage generation circuit, the voltage comparison portion circuit and the signal detection portion circuit are connected in series. The novel AC voltage detection circuit is simple to use and low in cost; and the detection circuit can realize judgment of the input of the AC voltage and detection of the AC voltage.
Description
Technical field
The present invention relates to testing circuit field, especially a kind of new ac voltage detection circuit.
Background technology
In the industrial production, the detection for input power becomes more and more important, and wherein relates generally to two aspects, one is whether
AC power is had to input, two are whether the magnitude of voltage that exchange inputs meets demand；For whether having the detection exchanging input, the most often
The way seen is using exchange optocoupler, is judged by the output level of detection exchange optocoupler, but this method can only be right
The input of the presence or absence of AC power is judged, the magnitude of voltage of input ac power can not be detected, for ac voltage
Detection, typically by the way of voltage transformer, by using current mode voltage transformer, the voltage that exchange is surveyed switchs to direct current
Voltage is detected thus being obtained the alternating voltage inputting, but this method needs to use voltage transformer and ad chip simultaneously
Just enable, high cost and circuit are complicated.
Content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of new ac voltage detection circuit, using simple, becomes
This is low, and circuit is capable of the judgement that alternating voltage input is had or not, and the detection of alternating voltage.
The technical solution adopted for the present invention to solve the technical problems is: a kind of new ac voltage detection circuit, including
Restricted portion circuit, AC-DC conversion partial circuit, reference voltage generating circuit, voltage ratio are compared with partial circuit and signal detecting part
Parallel circuit, restricted portion circuit, AC-DC conversion partial circuit, reference voltage generating circuit, voltage ratio are compared with partial circuit and letter
Number detection part circuit is sequentially connected in series.
Described reference voltage generating circuit adopts the tl431 chip of ON company.
Described voltage ratio adopts the lm2903 chip of st company compared with partial circuit.
The input current that described restricted portion circuit passes through to seal in resistance limiting AC electricity on AC input lines is allowing
In the range of；The alternating current of input is converted to by optical signal by described AC-DC conversion partial circuit by using exchange optocoupler
Direct current signal；Described reference voltage generating circuit produce for voltage ratio compared with threshold voltage；Described voltage ratio is compared with partial circuit
Comparison to optocoupler output voltage and predeterminated voltage is realized by voltage comparator, when the output voltage of exchange optocoupler is higher than benchmark
During voltage, comparator is output as high level, is output as low level less than comparator during reference voltage；Described signal detection is partly electric
Road is judged to the input of alternating voltage to the detection of comparator output level by mcu.
The invention has the beneficial effects as follows, a kind of new ac voltage detection circuit, using simple, low cost, circuit can
Realize the judgement that alternating voltage input is had or not, and the detection of alternating voltage.
Brief description
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is voltage detecting circuit schematic diagram of the present invention.
Fig. 2 is the waveform diagram of each circuit part of the present invention.
Specific embodiment
With reference to Fig. 1, a kind of new ac voltage detection circuit, including restricted portion circuit, AC-DC conversion partial circuit,
Reference voltage generating circuit, voltage ratio are compared with partial circuit and signal detection partial circuit, restricted portion circuit, AC-DC conversion portion
Parallel circuit, reference voltage generating circuit, voltage ratio are sequentially connected in series compared with partial circuit and signal detection partial circuit.
Restricted portion circuit is used for carrying out current limliting process to the AC signal of input, is ensureing input signal driving force
On the basis of limit input current in certain scope；AC-DC conversion partial circuit passes through two in tlp626 D.C mutual-inductor
AC signal rectification is DC signal output by individual reverse light emitting diode, and the emitter current due to exchanging optocoupler tlp626 is
/ 2nd of input current, corresponding VD when therefore can be calculated input exchange signal, will hand over simultaneously
The output end of streamer coupling is connected into the positive input terminal of voltage comparator；Reference voltage generating circuit uses tl431 high-precision programmable
Voltage-stabilized power supply obtains, and its magnitude of voltage is set to minimum alternating voltage the to be monitored DC voltage value after optocoupler conversion,
Reference voltage is input to the negative input end of voltage comparator simultaneously；It is right that voltage ratio is realized by voltage comparator compared with partial circuit
Optocoupler output voltage and the comparison of predeterminated voltage, when the output voltage exchanging optocoupler is higher than reference voltage, comparator is output as height
Level, is output as low level less than comparator during reference voltage.
With reference to Fig. 2, because exchange input is a kind of sinusoidal quantity, the light emitting diode in the exchange optocoupler when its voltage is zero
It is not turned on, then the output voltage values of optocoupler are maximum, comparator is output as high level.With the rising of alternating voltage, flow through exchange
In optocoupler, the electric current of light emitting diode is also increasing, and the DC voltage of optocoupler output is gradually lowered, when output valve is less than benchmark
During voltage, the output level of comparator can be redirected as low level output by high level.When ac voltage inversely increases, make exchange
When the output valve of optocoupler is more than reference voltage again, comparator can be redirected as high level by low level.Within each cycle, low electricity
Flat dutycycle is bigger, illustrates that the magnitude of voltage exchanging input is higher.This pulse that comparator is exported is transferred to mcu, and mcu leads to
Cross and low level dutycycle in voltage comparator output pulse is calculated, you can obtain the ac voltage inputting.Simultaneously
If what mcu detected comparator output is high level always, illustrating that the maximum of the alternating voltage inputting not yet reaches is
The minimum input voltage that system sets.
The detection that the present invention achieves by the way to the minimum input voltage of exchange judges, and can pass through comparator arteries and veins
Punching calculates the size of input voltage value.
Claims (3)
1. a kind of new ac voltage detection circuit is it is characterised in that inclusion restricted portion circuit, AC-DC conversion are partly electric
, compared with partial circuit and signal detection partial circuit, restricted portion circuit, alternating current-direct current turn for road, reference voltage generating circuit, voltage ratio
Change partial circuit, reference voltage generating circuit, voltage ratio relatively partial circuit and signal detection partial circuit to be sequentially connected in series.
2. new ac voltage detection circuit according to claim 1 is it is characterised in that there is electricity in described reference voltage
Road adopts the tl431 chip of ON company.
3. new ac voltage detection circuit according to claim 1 is it is characterised in that described voltage rating unit is electric
Road adopts the lm2903 chip of st company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610730321.6A CN106338641A (en) | 2016-08-26 | 2016-08-26 | Novel AC voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610730321.6A CN106338641A (en) | 2016-08-26 | 2016-08-26 | Novel AC voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106338641A true CN106338641A (en) | 2017-01-18 |
Family
ID=57822208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610730321.6A Pending CN106338641A (en) | 2016-08-26 | 2016-08-26 | Novel AC voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106338641A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581027A (en) * | 2017-09-29 | 2019-04-05 | 兄弟工业株式会社 | Alternating voltage detection device, image forming apparatus and industrial machine |
| CN111817584A (en) * | 2020-07-20 | 2020-10-23 | 深圳市普德新星电源技术有限公司 | Alternating current-direct current detection circuit, power supply protection circuit, switching power supply and protection method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0333660A (en) * | 1989-06-29 | 1991-02-13 | Fuji Elelctrochem Co Ltd | Eddy current detecting circuit |
| CN201945629U (en) * | 2010-11-25 | 2011-08-24 | 江苏中澳光伏能源科技有限公司 | Alternating voltage sampling circuit of photovoltaic inverter |
| CN102608410A (en) * | 2011-12-12 | 2012-07-25 | 中国电力科学研究院 | Pulse generation circuit, voltage measuring circuit and voltage measuring method |
| CN102788895A (en) * | 2011-05-18 | 2012-11-21 | 富泰华工业（深圳）有限公司 | Alternating voltage detection circuit |
| CN203883454U (en) * | 2014-06-04 | 2014-10-15 | 北京千驷驭电气有限公司 | A three-phase alternating current voltage fault detection apparatus |
| CN105445536A (en) * | 2015-12-29 | 2016-03-30 | 上海贝电实业（集团）股份有限公司 | Alternating current voltage acquisition device and working method thereof |
-
2016
- 2016-08-26 CN CN201610730321.6A patent/CN106338641A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0333660A (en) * | 1989-06-29 | 1991-02-13 | Fuji Elelctrochem Co Ltd | Eddy current detecting circuit |
| CN201945629U (en) * | 2010-11-25 | 2011-08-24 | 江苏中澳光伏能源科技有限公司 | Alternating voltage sampling circuit of photovoltaic inverter |
| CN102788895A (en) * | 2011-05-18 | 2012-11-21 | 富泰华工业（深圳）有限公司 | Alternating voltage detection circuit |
| CN102608410A (en) * | 2011-12-12 | 2012-07-25 | 中国电力科学研究院 | Pulse generation circuit, voltage measuring circuit and voltage measuring method |
| CN203883454U (en) * | 2014-06-04 | 2014-10-15 | 北京千驷驭电气有限公司 | A three-phase alternating current voltage fault detection apparatus |
| CN105445536A (en) * | 2015-12-29 | 2016-03-30 | 上海贝电实业（集团）股份有限公司 | Alternating current voltage acquisition device and working method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581027A (en) * | 2017-09-29 | 2019-04-05 | 兄弟工业株式会社 | Alternating voltage detection device, image forming apparatus and industrial machine |
| CN111817584A (en) * | 2020-07-20 | 2020-10-23 | 深圳市普德新星电源技术有限公司 | Alternating current-direct current detection circuit, power supply protection circuit, switching power supply and protection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170118 |
|
| RJ01 | Rejection of invention patent application after publication |