CN109560535A - A kind of AC overvoltage fast protection circuit - Google Patents
A kind of AC overvoltage fast protection circuit Download PDFInfo
- Publication number
- CN109560535A CN109560535A CN201811329128.7A CN201811329128A CN109560535A CN 109560535 A CN109560535 A CN 109560535A CN 201811329128 A CN201811329128 A CN 201811329128A CN 109560535 A CN109560535 A CN 109560535A
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- circuit
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- signal
- conditioning
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention relates to a kind of AC overvoltage fast protection circuits; it is made of level-one conditioning circuit and second level conditioning circuit; AC signal is converted to the direct current signal of 0-5V by level-one conditioning circuit, and second level conditioning circuit is by direct current signal conditioning at can be by the received pulse signal of subsequent processor.The present invention utilizes high speed ac-dc converter circuit and comparator circuit; AC overvoltage is realized quickly to protect; and the design of this circuit avoids the influence of traditional longer conversion time of RMS-DC converter chip; compare the stagnant ring design of device circuit; can AC overvoltage quickly protect; by the cooperation of CPU software, protection act can be reliably executed in 50ms when AC overvoltage is more than 175V.
Description
Technical field
The present invention relates to alternating voltage overvoltage quickly to protect, and belongs to primary distribution system field.More particularly to a kind of friendship
Flow through voltage fast protection circuit.
Background technique
Common overvoltage protection is mostly used AC voltage sampling circuit and CPU software is cooperated to realize.This aspect requires simulation
It is high to measure Acquisition Circuit real-time, on the other hand requires the processing real-times such as to sample analog quantity, filter in CPU software and want
It is high.Usual AC voltage sampling circuit realizes that this just determines hardware electricity using the common conditioning such as AC/DC converter combination amplifier
The delay time on road is 30ms or so, and the processing such as there is still a need for execution to be sampled in software, filters, and load disconnect when
Between, it not can guarantee and implement protection in 50ms.
It is especially in flight sequencing in primary power distribution, needs in AC system over-voltage pair in flight sequencing
Load executes protection, (is greater than 175V) when overtension and needs to be implemented quick protection, and load connection is disconnected in 50ms.This is just
It is required that over-voltage fast protection circuit speed is fast, high reliablity, at present still without a kind of circuit for realizing such function.
Summary of the invention
The purpose of the present invention:
The purpose of the invention is to overcome over-voltage in distribution system quickly to protect the defect that speed is slow, reliability is low.Electricity
It needs that AC system is implemented to protect in gas distribution system, when exchange ground supply voltage is more than 175V, needs in 50ms
The connection for disconnecting contactor, so the real-time of over-voltage fast protection circuit, reliability are particularly important.The exchange that the present invention designs
Overvoltage fast protection circuit fundamentally solves the above problem.
The technical scheme adopted by the invention is as follows:
A kind of AC overvoltage fast protection circuit, is made of level-one conditioning circuit and second level conditioning circuit, level-one conditioning
AC signal is converted to the direct current signal of 0-5V by circuit, and second level conditioning circuit is by direct current signal conditioning at can be by subsequent processing
The received pulse signal of device.
It is characterized in that, level-one conditioning circuit by divider resistance, follow circuit, ac-dc converter circuit to form, wherein R1,
R2 is divider resistance, and R1, R2 connect, and common end is connect with 3 feet of amplifier U1, another termination alternating voltage input of R1, and R2 is another
Alternating voltage is transformed within 0-5V by end ground connection, front end divider resistance, realizes that signal follows by amplifier U1, and the 1 of amplifier U1
Foot is connected with 2 feet, signal will be followed to export to 2 feet of the amplifier U2 of ac-dc converter circuit, between 2 feet and 1 foot of amplifier U2
Matching connection resistance R5, and d. c. voltage signal is exported by 1 foot.
It is characterized in that, second level conditioning circuit is made of comparison circuit and isolation circuit, comparison circuit by resistance R7, R8,
R9, R10, R11, R12 and comparator U3 composition, the output of level-one conditioning circuit are connected to 2 feet of comparator U3 by resistance R7,
2 feet of comparator U3 are connected to 7 feet of comparator U3 by resistance R12, and R8 connects with R10, and common end is connected to ratio by R9
3 feet compared with device U3,3 feet of comparator U3 generate threshold voltage, another termination+15V power supply of R8, R10 other end ground connection, comparator
8 feet of U3 connect+15V power supply, and 4 feet connect -15V power supply, 1 foot ground connection, and R11 connects with R12, and common end connects the 7 of comparator U3
Foot, R11 another termination+15V power supply, by comparing input value and threshold voltage, the 7 feet output low and high level of comparator U3 to every
From circuit, after current-limiting resistance R13 and optocoupler U4, conditioning is at can be by the received pulse signal of subsequent processor.
It is characterized in that, the chip delay time that the ac-dc converter circuit of level-one conditioning circuit uses is short, make signal
Timing_delay estimation is at ms grades.
It is characterized in that, alternating voltage is inputted in proportion by divider resistance R1, R2Be converted to the friendship of small magnitude
Flow voltage signal.
It is characterized in that, it is that 3.3V can be adopted by CPU that the pulse signal that amplitude is 15V is converted to amplitude by the isolation circuit
The signal of collection realizes being electrically isolated completely to for signal.
Beneficial effects of the present invention:
A kind of AC overvoltage fast protection circuit through the invention is, it can be achieved that real-time, quick when Line over-voltage
Protection, while over-voltage protecting function reliability with higher.
Detailed description of the invention
Fig. 1 is level-one conditioning circuit of the present invention
Fig. 2 is second level conditioning circuit of the present invention
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings of the specification.
Fig. 1 is level-one conditioning circuit of the invention.Level-one conditioning circuit by divider resistance, follow circuit, AC-DC conversion
Circuit composition.Wherein R1, R2 are divider resistance, and voltage transformation is within 0-5V, by amplifier and periphery by front end bleeder circuit
AC signal is converted to the effective value signal of direct current by the conditioning of circuit, and the 1st foot of U2 exports direct current signal.
Ac-dc converter circuit consists of two parts, if input signal is V1, the 3 foot voltages of U2 are V2.As V1 > 0,
Amplifier U2-2 reverse input end is positive, and amplifier U2-2 output voltage U2-7 is negative, diode D1 cut-off.V2=V1.As V1 <
When 0, amplifier U2-2 reverse input end is negative, and amplifier output voltage is positive, diode V1 conducting, V2=0.This part electricity can be obtained
Road expression formula are as follows:
Amplifier U2-1 peripheral circuit is analyzed it is found that as V2=V1, two input terminal voltage of amplifier is identical, output end voltage
V3=V1；As V2=0,Due to R5=R4, V3=-V1.V3=can to sum up be obtained | V1 |.
Fig. 2 is second level acquisition and conditioning circuit of the invention.Second level conditioning circuit is made of comparison circuit and isolation circuit.Than
Compared with circuit by comparing input value and threshold voltage, low and high level is exported, is improved later by the isolation of optocoupler into 3.3V/0.
The threshold value of comparison circuit isWhen input signal is exchange 175V, second level input letter
Number maximum value isComparison circuit can effectively export rising edge signal, when input is believed
Number for exchange 165V when, second level input signal maximum value isLess than threshold value is compared, compare
Circuit exports low level always.
When second level input voltage rises, when noninverting input voltage is greater than the threshold value of comparison circuit, comparison circuit, that is, defeated
High level out.When second level input voltage is greater than the threshold value of comparison circuit, during dropping under voltage,
Work as V+When for comparator threshold voltage 5.844V, input voltage 5.01V, this just be ensure that when input voltage has ripple, fortune
The stability for putting output signal ensure that the reliability of circuit.
Claims (4)
1. a kind of AC overvoltage fast protection circuit, is made of level-one conditioning circuit and second level conditioning circuit, level-one conditioning electricity
AC signal is converted to the direct current signal of 0-5V by road, and second level conditioning circuit is by direct current signal conditioning at can be connect by subsequent processor
The pulse signal of receipts；
Wherein, level-one conditioning circuit by divider resistance, follow circuit, ac-dc converter circuit to form, wherein R1, R2 be partial pressure electricity
Resistance, R1, R2 series connection, common end are connect with 3 feet of amplifier U1, another termination alternating voltage input of R1, R2 other end ground connection, front end
Alternating voltage is transformed within 0-5V by divider resistance, realizes that signal follows by amplifier U1, and 1 foot of amplifier U1 is connected with 2 feet,
Signal will be followed to export to 2 feet of the amplifier U2 of ac-dc converter circuit, matching connection resistance between 2 feet and 1 foot of amplifier U2
R5, and d. c. voltage signal is exported by 1 foot.
Second level conditioning circuit is made of comparison circuit and isolation circuit, comparison circuit by resistance R7, R8, R9, R10, R11, R12 and
Comparator U3 composition, the output of level-one conditioning circuit are connected to 2 feet of comparator U3 by resistance R7, and 2 feet of comparator U3 are logical
7 feet that resistance R12 is connected to comparator U3 are crossed, R8 connects with R10, and common end is connected to 3 feet of comparator U3 by R9, compares
3 feet of device U3 generate threshold voltage, another termination+15V power supply of R8, and the R10 other end is grounded, and 8 feet of comparator U3 connect+15V confession
Electricity, 4 feet connect -15V power supply, 1 foot ground connection, and R11 connects with R12, and common end connects 7 feet of comparator U3, another termination+15V of R11
Power supply, by comparing input value and threshold voltage, 7 feet of comparator U3 export low and high level to isolation circuit, by current limliting electricity
After hindering R13 and optocoupler U4, conditioning is at can be by the received pulse signal of subsequent processor.
2. a kind of AC overvoltage fast protection circuit as described in claim 1, which is characterized in that the friendship of level-one conditioning circuit
The chip delay time that DC converting circuit uses is short, makes the timing_delay estimation of signal at ms grades.
3. a kind of AC overvoltage fast protection circuit as described in claim 1, which is characterized in that by divider resistance R1,
R2 inputs alternating voltage in proportionBe converted to the ac voltage signal of small magnitude.
4. a kind of AC overvoltage fast protection circuit as described in claim 1, which is characterized in that the isolation circuit is by width
It is the signal that 3.3V can be acquired by CPU that the pulse signal that value is 15V, which is converted to amplitude, realizes being electrically isolated completely to for signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329128.7A CN109560535A (en) | 2018-11-09 | 2018-11-09 | A kind of AC overvoltage fast protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329128.7A CN109560535A (en) | 2018-11-09 | 2018-11-09 | A kind of AC overvoltage fast protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109560535A true CN109560535A (en) | 2019-04-02 |
Family
ID=65866160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811329128.7A Pending CN109560535A (en) | 2018-11-09 | 2018-11-09 | A kind of AC overvoltage fast protection circuit |
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| Country | Link |
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| CN (1) | CN109560535A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260499A (en) * | 2019-06-13 | 2019-09-20 | 珠海格力电器股份有限公司 | A kind of ac signal acquisition device, air-conditioning and its Sampling Method of AC Signal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257334A (en) * | 1999-12-16 | 2000-06-21 | 常熟开关厂 | Intelligent controller for communicable plastics casing circuit breaker |
| CN102013660A (en) * | 2010-09-30 | 2011-04-13 | 上海良信电器股份有限公司 | Quadrupole overvoltage-undervoltage protection circuit and method |
| CN102128972A (en) * | 2011-01-12 | 2011-07-20 | 重庆市电力公司城区供电局 | Sensor device for monitoring transient voltage of broadband integral type power grid |
| CN204333903U (en) * | 2014-12-02 | 2015-05-13 | 天津航空机电有限公司 | A kind of overvoltage crowbar |
| CN205992725U (en) * | 2016-06-24 | 2017-03-01 | 中航太克（厦门）电力技术股份有限公司 | A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA |
-
2018
- 2018-11-09 CN CN201811329128.7A patent/CN109560535A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257334A (en) * | 1999-12-16 | 2000-06-21 | 常熟开关厂 | Intelligent controller for communicable plastics casing circuit breaker |
| CN102013660A (en) * | 2010-09-30 | 2011-04-13 | 上海良信电器股份有限公司 | Quadrupole overvoltage-undervoltage protection circuit and method |
| CN102128972A (en) * | 2011-01-12 | 2011-07-20 | 重庆市电力公司城区供电局 | Sensor device for monitoring transient voltage of broadband integral type power grid |
| CN204333903U (en) * | 2014-12-02 | 2015-05-13 | 天津航空机电有限公司 | A kind of overvoltage crowbar |
| CN205992725U (en) * | 2016-06-24 | 2017-03-01 | 中航太克（厦门）电力技术股份有限公司 | A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260499A (en) * | 2019-06-13 | 2019-09-20 | 珠海格力电器股份有限公司 | A kind of ac signal acquisition device, air-conditioning and its Sampling Method of AC Signal |
| CN110260499B (en) * | 2019-06-13 | 2020-12-25 | 珠海格力电器股份有限公司 | Alternating current signal acquisition device, air conditioner and alternating current signal acquisition method of air conditioner |
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Application publication date: 20190402 |