CN2031172U - Over-voltage protector - Google Patents
Over-voltage protector Download PDFInfo
- Publication number
- CN2031172U CN2031172U CN 87214396 CN87214396U CN2031172U CN 2031172 U CN2031172 U CN 2031172U CN 87214396 CN87214396 CN 87214396 CN 87214396 U CN87214396 U CN 87214396U CN 2031172 U CN2031172 U CN 2031172U
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- CN
- China
- Prior art keywords
- voltage
- over
- circuit
- overvoltage
- overvoltage protection
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- 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.)
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Abstract
The utility model discloses an overvoltage protection which is used for the output end of an AC voltage stabilizer. The over-voltage protector can distinguish effectively true and false over-voltage signals to avoid the malfunctions of a protection device caused by the secondary moment over voltage generated when the AC voltage stabilizer is switched on via the arrangement of an over-voltage singal distinguish circuit. The utility model has the advantages of high reliability, low cost, small size and low power, and therefore, the over-voltage is suitable for the overvoltage protection of various AC voltage stabilizers.
Description
The utility model is a kind of AC overvoltage protection device, particularly a kind of overvoltage protection that is applicable to the AC voltage regulator output.
Now 220 volts of AC voltage regulator using in a large number all do not have overvoltage protection, in case electric component performance parameter variations or components and parts break down, AC voltage regulator will be exported the overvoltage up to 300 volts, the danger that causes electrical appliance to puncture or burn.In addition, because AC voltage regulator when normal boot-strap, also will produce the secondary transient overvoltage.For the first time be in start moment, another time produces when then connecting high pressure after preheating a few minutes.The generation of this secondary transient overvoltage very easily makes the protective device of present existing band over-voltage protecting function, produces misoperation as electric leakage overvoltage protector etc.Like this, just give and be furnished with the electrical appliance of AC voltage regulator, brought difficulty as the safe operation of high-grade accurate electrical equipment such as computer.Solve this difficult technologies scheme at present and have two kinds: a kind of is to install an interpolation type over-pressure safety device by producer additional in the AC voltage regulator inside of new production, as parts of pressurizer, it can't be applicable to the AC voltage regulator of the no overvoltage protection that has come into operation; Another kind is the method that protector is connected in the output of AC voltage regulator such as employing after stable again, needs artificial twice operation, uses inconvenience.And the major loop of this protector has not only increased production cost but also enlarged volume with the A.C. contactor circuit switching of deciding.
The purpose of this utility model is will provide a kind of can avoid the secondary transient overvoltage that the AC voltage regulator start time is produced, and the AC voltage regulator overvoltage protection device with the overvoltage function of distinguishing true from false.
The utility model mainly is made up of following three parts: A, over-voltage detection circuit; B, overvoltage signal recognition circuit; C, driving mechanism for switch.Realize that task of the present utility model solves by the following technical programs: an overvoltage signal recognition circuit is set behind over-voltage detection circuit, served as the sinusoidal wave continuously above behind some cycles of piezoelectricity pressure, the overvoltage signal recognition circuit is just exported a level and is driven the electromagnetic switch tripping operation.
In order to guarantee that switch motion is reliable and reduce production costs that the utility model has adopted a kind of electromagnetic drive type trip switch on ac main circuit.
Below in conjunction with accompanying drawing its operation principle is described.
Over-voltage detection circuit adopts the bridge sampling circuit with temperature compensation function, to improve the temperature stabilization performance of product.By R
1, R
2, D
1The sampling slip of forming, directly the peak value to per half cycle of input voltage on the electrical network detects.IC
1Be the open collector comparator, IC
1-1Be connected into Schmidt circuit, both improved detection sensitivity, exportable again enough pulse durations are for back level IC
1-2The overvoltage signal of distinguishing true from false is used.The overvoltage signal recognition circuit is with IC
1-2Be the center, add IC
1-1, R
5, R
6, D
2, C
1Form, the overvoltage signal on electrical network, occurs and make voltage U
AoGreater than reference voltage U
BoThe time, comparator IC
1-1Output OC door just become by (open circuit), at this moment R by saturated
5, D
2, C
1IC
1-2The unidirectional integrating circuit of forming begins integration; Work as voltage U
AoLess than reference voltage U
BoThe time, comparator IC
1-1Output OC door just by by become saturated, at this moment, because of D
2The one-way check effect, capacitor C
1Power on and press off the beginning to R
6, IC
1-2Output OC door between discharge.As import on the electrical network overvoltage signal and continue to exist, integral voltage U then
DoAscendant trend has served as the sinusoidal wave continuously above after setting cycle of piezoelectricity pressure, U always greater than (discharge) trend that descends
DoWill be greater than U
Bo, IC at this moment
1-2Will export true overvoltage signal.Otherwise, U
DoIntegral voltage just is difficult to reach U
BoReference voltage, pretend into pseudo-overvoltage signal by IC
1-2Block, true overvoltage signal is through IC
1-3After the shaping, can export a high level and remove to trigger small power single to controllable silicon SCR, conducting.The energy of protector switch motion is provided by coil K, works as SCR, the moment of conducting, K
1-1, K
1-2Promptly disconnect path and pinning simultaneously, except that indicating section, cut off all power supplys.After overvoltage condition disappears, close a floodgate with manual mode, protector can restart work.
μ in is a protector ac main circuit input among the figure one, and μ out is an output.и E is the overvoltage indicator light.
It is big to the utlity model has load bearing capacity, reliable operation, and advantage such as power controlling is little, and adopt the electromagnetic drive type switch, make its cost reduce volume-diminished.The AC voltage regulator that is applicable to different capabilities is used, and social benefit and economic benefit are obvious.
Claims (2)
1, a kind of AC voltage regulator overvoltage protection device comprises by voltage comparator ic
1-1The over-voltage detection circuit that Schmidt circuit and bridge sampling circuit are formed, IC
1-2Overvoltage signal recognition circuit and driving mechanism for switch is characterized in that: at voltage comparator ic
1-1Be connected to by voltage comparator ic behind the circuit
1-2, capacitor C
1, diode D
2, and resistance R
5The unidirectional integral form true and false overvoltage signal recognition circuit of forming.
2, overvoltage protection device as claimed in claim 1 is characterized in that: driving mechanism for switch is the electromagnetic drive type trip switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87214396 CN2031172U (en) | 1987-10-14 | 1987-10-14 | Over-voltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87214396 CN2031172U (en) | 1987-10-14 | 1987-10-14 | Over-voltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2031172U true CN2031172U (en) | 1989-01-18 |
Family
ID=4828727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87214396 Withdrawn CN2031172U (en) | 1987-10-14 | 1987-10-14 | Over-voltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2031172U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354634C (en) * | 2004-08-30 | 2007-12-12 | 联咏科技股份有限公司 | Instantaneous voltage detection circuit to multiple power source supply end |
| CN100449898C (en) * | 2002-09-20 | 2009-01-07 | 西门子公司 | Overvoltage protector for electric network |
| CN102163838A (en) * | 2010-02-22 | 2011-08-24 | 凹凸电子（武汉）有限公司 | Battery protection circuit and method |
| US8618805B2 (en) | 2004-03-25 | 2013-12-31 | 02Micro, Inc. | Battery pack with a battery protection circuit |
-
1987
- 1987-10-14 CN CN 87214396 patent/CN2031172U/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449898C (en) * | 2002-09-20 | 2009-01-07 | 西门子公司 | Overvoltage protector for electric network |
| US8618805B2 (en) | 2004-03-25 | 2013-12-31 | 02Micro, Inc. | Battery pack with a battery protection circuit |
| CN100354634C (en) * | 2004-08-30 | 2007-12-12 | 联咏科技股份有限公司 | Instantaneous voltage detection circuit to multiple power source supply end |
| CN102163838A (en) * | 2010-02-22 | 2011-08-24 | 凹凸电子（武汉）有限公司 | Battery protection circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |