CN2567847Y - Instantaneous overvoltage protector - Google Patents
Instantaneous overvoltage protector Download PDFInfo
- Publication number
- CN2567847Y CN2567847Y CN 02240019 CN02240019U CN2567847Y CN 2567847 Y CN2567847 Y CN 2567847Y CN 02240019 CN02240019 CN 02240019 CN 02240019 U CN02240019 U CN 02240019U CN 2567847 Y CN2567847 Y CN 2567847Y
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- CN
- China
- Prior art keywords
- control chip
- foot
- pin
- triode
- resistance
- 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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an instantaneous overvoltage protector which comprises a control chip, voltage comparators, transistors, a diode, a resistor, and a capacitor, wherein, three voltage comparators form wires and circuits, and an output end emitter follower circuit; a DOUT pin of the control chip is connected with the inversion end of another voltage comparator, and then is connected with an S foot of the control chip; the S foot of the control chip is connected with a collector of the transistor in the emitter follower circuit, a foot R is connected with a collector of another transistor, an INI foot is connected with the resistor, and the INI foot is connected with an OUT1 foot and an OUT2 foot respectively through the capacitor and the resistor. A dead area and the time delay of the protector are adjustable, the dead area can be used for avoiding some momentary interference signals and can be maintained for some time after overvoltage signals are detected, and thus electronic equipment has a restoration process to high voltage sensitive devices such as voltage-sensitive resistors, and the utility model is especially suitable for areas with poor electrical network power supply quality.
Description
Technical field
The utility model relates to a kind of instantaneous overvoltage protector, and particularly a kind of dead band, the adjustable instantaneous overvoltage protector of time-delay belong to electronic technology field.
Background technology
At present, there is some high order harmonic component in the electrical network of remote districts at home.Because influence of harmonic, the crest voltage of line voltage can reach 200% of normal value.This lasting peak voltage causes that very easily the semiconductor device overvoltage damages.Need a kind of instantaneous overvoltage crowbar for this reason; can reflect sensitive and accurately that the sustained overvoltage signal has one section adjustable dead band again; to escape the interference signal of a little utmost point short time; can also keep a period of time after detecting the overvoltage signal, device such as the piezo-resistance to the high pressure sensitivity has a recovery process in the electronic equipment so that make.And this time-delay also should be adjustable.
Summary of the invention
The purpose of this utility model is at above-mentioned demand; a kind of dead band, the adjustable instantaneous overvoltage protector of time-delay are provided; can reflect sensitive and accurately that the sustained overvoltage signal has one section adjustable dead band again, can also keep a period of time after detecting the overvoltage signal.
For realizing above-mentioned goal of the invention, the utility model adopts following technical scheme:
Plant instantaneous overvoltage protector, comprise control chip, voltage comparator, triode, diode, resistance, electric capacity, it is characterized in that:
The homophase termination threshold level of three voltage comparators is formed line and circuit, and the output termination is by penetrating with circuit that diode, triode, resistance are formed; The DOUT pin of control chip joins through the end of oppisite phase of resistance and triode and another voltage comparator, and the S pin through resistance and triode and control chip joins again; The S pin of control chip connects the collector electrode of penetrating with triode in the circuit, and the R pin connects the collector electrode of another triode, and the base stage of described triode connects the output of the voltage comparator of forming line and circuit through resistance and diode; The INI pin connecting resistance of control chip, and join with OUT1 pin and OUT2 pin through electric capacity and resistance respectively.
The dead band of instantaneous overvoltage protector described in the utility model, time-delay can be regulated; both can utilize the dead band to escape the interference signal of some utmost point short time; can after detecting the overvoltage signal, keep a period of time again; device such as the piezo-resistance to the high pressure sensitivity has a recovery process in the electronic equipment so that make, therefore at the bad regional particularly suitable of grid supply quality.
Description of drawings
Fig. 1 is the circuit theory diagrams of instantaneous overvoltage protector described in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further described.
As shown in Figure 1, RP11 provides the threshold level of instantaneous overvoltage, is connected on the in-phase end of three LM339 comparators.Three LM339 comparators are formed line and circuit, therefore need only any one overvoltage in three input voltages, and a point is low-voltage.R281, V28, V27 constitute and penetrate with circuit, have both isolated a, b 2 points, make when not having subsequent conditioning circuit to influence the two current potential close again.R282, R283, C58 are connected on 3,5,4 pin of MC14536 respectively, constitute the clock circuit of MC14536, regulate the running clock cycle that R282 or C58 can change MC14536, the potential state of 9,10,11,12 pin by MC14536 is set can obtain different delay times.When line voltage just often, a point, b point all are high level, the 13 pin DOUT of MC14536 are output as high level, the collector electrode C point of the V30 that is attached thereto is low level, end of oppisite phase is output as high-impedance state with 14 pin of the comparator LM339 that the C point is connected.When peak value appearred in line voltage, a point, b point current potential reduced rapidly.Have only the low duration of ordering as b to surpass the half of the cycle of oscillation of MC14536, the output of 13 pin DOUT is just by high step-down.Just because of there being this time half period, circuit has just had the Dead Time of half period, and this one-period can be set adjusting by R282, C58.When b point current potential by high step-down, and under the inside counting circuit of the MC14536 situation about also starting, if there is not the influence of other control end, 13 pin DOUT will by after the time delays that presets by high level step-down level.This preset time can be set by the high-low level of 9,10,11,12 pin of control MC14536, and just this preset time makes that the device to the high pressure sensitivity has had one period recovery time in the electronic equipment.
After 13 pin DOUT became low level, the C point was high level.This high level makes 14 pin of LM339 become low level, the output protection signal on the one hand; By R287, V31 the current potential of 1 pin S end is forced to drag down on the other hand, guaranteed that circuit has enough delay times (because 1 pin occurs after the high level, the internal oscillator of MC14536 will be ended at once).In the time-delay process of circuit, if continuous overvoltage appears in electrical network once more, lasting low level appears in the current potential that a is ordered, and at this moment, the high potential that c is ordered will be forced the current potential of 2 pin R end to lift to be high level by V29, R286, V32, R285.After R brought out existing high level, the MC14536 internal oscillator stopped, and DOUT keeps low level simultaneously, and circuit continues the output protection signal.Have only after the disappearance of electrical network sustained overvoltage, high level appears in a point, and the R terminal potential just can reduce to 0, and the internal oscillator of MC14536 could start.Only so just guaranteed that after overvoltage disappearance certain hour, guard signal could be removed.
Instantaneous overvoltage protector described in the utility model also can be used for other protection testing circuit.Because the overvoltage signal is a kind of of fault-signal, as long as have dead band, the adjustable requirement of time-delay to realize with this circuit topological structure to the instantaneous signal of input.
Need to prove; particular of the present utility model is described in detail the utility model; for a person skilled in the art, in the various conspicuous change of under the situation that does not deviate from spirit and scope of the present utility model it being carried out all within protection range of the present utility model.
Claims (3)
1. an instantaneous overvoltage protector comprises control chip, voltage comparator, triode, diode, resistance, electric capacity, it is characterized in that:
The homophase termination threshold level of three voltage comparators is formed line and circuit, and the output termination is by penetrating with circuit that diode, triode, resistance are formed; The D of control chip
OUTPin joins through the end of oppisite phase of resistance and triode and another voltage comparator, and the S pin through resistance and triode and control chip joins again; The S pin of control chip connects the collector electrode of penetrating with triode in the circuit, and the R pin connects the collector electrode of another triode, and the base stage of described triode connects the output of the voltage comparator of forming line and circuit through resistance and diode; The INI pin connecting resistance of control chip, and join with OUT1 pin and OUT2 pin through electric capacity and resistance respectively.
2. in moment as claimed in claim 1 overvoltage protector, control chip is UC3524A.
3. in moment as claimed in claim 1 overvoltage protector, voltage comparator is LM339.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02240019 CN2567847Y (en) | 2002-07-05 | 2002-07-05 | Instantaneous overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02240019 CN2567847Y (en) | 2002-07-05 | 2002-07-05 | Instantaneous overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2567847Y true CN2567847Y (en) | 2003-08-20 |
Family
ID=33713249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02240019 Expired - Fee Related CN2567847Y (en) | 2002-07-05 | 2002-07-05 | Instantaneous overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2567847Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100356650C (en) * | 2005-08-26 | 2007-12-19 | 清华大学 | Intelligent data collecting and overvoltage protective system for high and medium voltage power device |
| CN106211530A (en) * | 2016-09-07 | 2016-12-07 | 中国科学院近代物理研究所 | A kind of overvoltage control circuit for X-radiation instrument and high tension generator |
| US10263416B2 (en) | 2012-12-03 | 2019-04-16 | Huawei Technologies Co., Ltd. | Overvoltage protection apparatus and method |
-
2002
- 2002-07-05 CN CN 02240019 patent/CN2567847Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100356650C (en) * | 2005-08-26 | 2007-12-19 | 清华大学 | Intelligent data collecting and overvoltage protective system for high and medium voltage power device |
| US10263416B2 (en) | 2012-12-03 | 2019-04-16 | Huawei Technologies Co., Ltd. | Overvoltage protection apparatus and method |
| US11404867B2 (en) | 2012-12-03 | 2022-08-02 | Huawei Techologies Co., Ltd. | Overvoltage protection apparatus and method |
| CN106211530A (en) * | 2016-09-07 | 2016-12-07 | 中国科学院近代物理研究所 | A kind of overvoltage control circuit for X-radiation instrument and high tension generator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |