CN205945043U - Peak overvoltage protection circuit - Google Patents
Peak overvoltage protection circuit Download PDFInfo
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- CN205945043U CN205945043U CN201620888247.6U CN201620888247U CN205945043U CN 205945043 U CN205945043 U CN 205945043U CN 201620888247 U CN201620888247 U CN 201620888247U CN 205945043 U CN205945043 U CN 205945043U
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Abstract
The utility model discloses a peak overvoltage protection circuit comprises with the direct current side high energy nonlinear damping resistance and the electric capacity that are connected to it three phase bridge. Three phase bridge draws forth A, B, C looks binding post by first to the 6th diode cluster one -tenth, with a series resistance behind electric capacity, second resistance, the 3rd resistor parallel with, then whole and three phase bridge is parallelly connected, behind fourth resistance and the 5th series resistance with three phase bridge is parallelly connected, the common port of fourth resistance and the 5th resistance is connected to the one end of the 6th resistance, and the other end is drawn forth as ground terminal. The utility model discloses collection peak surge, to trade arc, operation, lightning stroke overvoltage as an organic whole, can effectively protect the winding insulation against ground.
Description
Technical field
This utility model is related to power system device, specifically related to a kind of peak overvoltage protection circuit.
Background technology
Developing rapidly of modernization industry, employs many jumbo power electronic equipments, for example in electrical network：One existing
Often accounted for using the capacity of thyristor converter devices in the enterprises such as generationization heavy steel rolling mill, smeltery, chemical plant and all use electric capacity
More than half of amount, large-capacity power electronic equipment bring conveniently, efficient and huge economic interests while, by
In the use electrical characteristics of its non-linear, impact and unbalanced frequent switching, also pollute to utility network, and inject big
Amount harmonic wave and reactive power, especially because the moment that controllable silicon commutation produces changes very high, the serious arteries and veins of arc tip peak Overvoltage Amplitude
Punching is disturbed and is persistently disturbed and brings serious threat to the insulation such as rectifier transformer, anode cable, thyristor and motor, weight
Then cause to puncture or burn.
The main impact that thyristor converter devices run has following three kinds：
1. harmonic wave interference：Thyristor converter devices are the nonlinear loads of power supply, and it makes to contain many height in source current
Subharmonic, each cross streams electric current of the three-phase bridge-type rectifier of inductive load is the very steep trapezoidal wave in forward position, containing 6K ± 1 time
Harmonic wave (K is positive integer), when harmonic current flows through power supply, can produce higher hamonic wave pressure drop in its internal impedance, make the end of power supply
Voltage is distorted, especially when electrical network resonance is in certain subfrequency, (as between the leakage reactance of rectifier transformer and distribution wire
Distribution capacity occur resonance), can make power supply terminal voltage occur Severe distortion.Harmonic current in supply voltage makes various changes
The loss of the equipment such as depressor, motor, electromagnetic valve increases, and temperature rise is increased, and largely effects on normal work and service life.
2. voltage drop and voltage pulsation：Carrying out pressure regulation with IGCT phase controlling can increase the idle component of source current,
Reduce supply voltage, carry out phase-adjusted voltage waveform distortion fluctuation abnormal severe.
3. transition interference peak overvoltage：IGCT belongs to high-power electric and electronic switching device, particularly related one
The moment of disconnected and another phase triggering and conducting, because the long-pending cave effect of carrier makes the controllable silicon of conducting can not immediately turn off, in electricity
Source is alternate to cause very big transient short-circuit current, according to changing road law：The electric current of inductance coil can not be mutated, in anode loop
In moment of turning off of short circuit current, because drastically changing of electric current will produce amplitude is very high, hazardness is very big transition spike mistake
Voltage, additionally can cause frequency to be up to the higher-order of oscillation of 15MHZ by L, C link.In addition, the power supply causing during IGCT commutation
Breach can produce certain impact to the work of instrument and equipment.
Utility model content
For case above, the measure of domestic employing at present：Mainly single resistance-capacitance absorption protection, DeGrain and
It is impossible to the problem of effective protection controllable silicon and rectifier transformer, this utility model offer is a kind of to collect point to the problem of " bulge "
Peak surge, change arc, peak overvoltage protection circuit that operation, Lightning Over-voltage are integrated, can effectively solve above-mentioned technology
A difficult problem.
For reaching above-mentioned purpose, embodiment of the present utility model adopts the following technical scheme that：
A kind of peak overvoltage protection circuit, including three-phase commutation bridge, wherein, the first diode and the second Diode series
The tie point of formation three-phase commutation bridge, the 3rd diode and the 4th Diode series form the second branch road of three-phase commutation bridge,
5th diode and the 3rd branch road of the 6th Diode series formation three-phase commutation bridge, the tie point of described three-phase commutation bridge,
Second branch road and the 3rd branch circuit parallel connection；Electric capacity, second resistance, connect with first resistor after 3rd resistor parallel connection, then overall and
Described three-phase commutation bridge is in parallel；4th resistance is in parallel with described three-phase commutation bridge with after the 5th resistant series, the 4th resistance and
The common port of five resistance connects the 6th resistance.
According to one side of the present utility model, the common port of described first diode and the second diode is drawn as A
Connect line terminals.
According to one side of the present utility model, the common port of described 3rd diode and the 4th diode is drawn as B
Connect line terminals.
According to one side of the present utility model, the common port of described 5th diode and the 6th diode is drawn as C
Connect line terminals.
According to one side of the present utility model, one end of described 6th resistance connects the public affairs of the 4th resistance and the 5th resistance
Hold altogether, the other end is drawn as ground terminal.
The advantage that this utility model is implemented：
This utility model is a kind of anodic overvoltage synthesis suppression circuit, and when normally running, three-phase commutation bridge is to electric capacity two
End is charged, and produces high frequency spikes surge and when changing arc overvoltage between line voltage, due to electric capacity two ends voltage not
Can be mutated, electric capacity continues charging energy-storing, after overvoltage disappears, electric capacity discharges to 3rd resistor, wait next cycle to continue suction
Receive, second resistance plays clamper, the effect of protection electric capacity.Three-phase is through diode → the 4th resistance and the 5th resistance → the 6th resistance
To earth-return, can be with effective protection winding insulation against ground.
Brief description
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, will make to required in embodiment below
Accompanying drawing be briefly described it should be apparent that, drawings in the following description be only some embodiments of the present utility model,
For those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Other accompanying drawings.
Fig. 1 is circuit theory diagrams of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work
The every other embodiment being obtained, broadly falls into the scope of this utility model protection.
Refer to Fig. 1, peak overvoltage protection circuit of the present utility model, it is made up of six diodes including one
Three-phase commutation bridge.Wherein, diode D1, D2 series connection forms the tie point of three-phase commutation bridge, and both common ports are drawn as A
Connect line terminals；Diode D3, D4 series connection forms the second branch road of three-phase commutation bridge, and both common ports are drawn and connected as B
Line terminals；Diode D5, D6 series connection forms the 3rd branch road of three-phase commutation bridge, and both common port is drawn and connected line end as C
Son.Form three-phase commutation bridge after above-mentioned tie point, the second branch road and the 3rd branch circuit parallel connection.Electric capacity C, resistance R2, resistance R3
After joining with resistance R1 after parallel connection, then overall in parallel with three-phase commutation bridge, wherein, electric capacity C, resistance R2, resistance R3 connect two poles
The input of pipe D1, D3, D5.In parallel with three-phase commutation bridge after resistance R-, R+ series connection, both common ports connect the one of resistance SD
End, the other end of resistance SD is drawn as ground terminal.
Operation principle of the present utility model is as follows：This circuit by three-phase diode full-wave rectifying circuit and is connected to the straight of it
Stream side high-energy non-linear damping resistance and electric capacity composition.During normal operation, three-phase commutation bridge is charged to electric capacity C two ends,
When producing high frequency spikes surge between line voltage and change arc overvoltage, the voltage due to electric capacity C two ends can not be mutated, electric capacity
C continues charging energy-storing, and after overvoltage disappears, electric capacity C discharges to resistance R3, waits next cycle to continue to absorb, resistance R2 rises
To clamper, protect the effect of electric capacity C.Three-phase through diode → R+ (R-) → SD to earth-return, can with effective protection winding over the ground
Insulation.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model does not limit to
In this, in any those skilled in the art technical scope disclosed in this utility model, the change that can readily occur in
Change or replace, all should cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with described
Scope of the claims is defined.
Claims (5)
1. a kind of peak overvoltage protection circuit it is characterised in that：Including three-phase commutation bridge, wherein, the first diode (D1) and
Second diode (D2) series connection forms the tie point of three-phase commutation bridge, the 3rd diode (D3) and the series connection of the 4th diode (D4)
Form the second branch road of three-phase commutation bridge, the of the 5th diode (D5) and the 6th diode (D6) series connection formation three-phase commutation bridge
Three branch roads, the tie point of described three-phase commutation bridge, the second branch road and the 3rd branch circuit parallel connection；Electric capacity (C), second resistance (R2),
Connect with first resistor (R1) after 3rd resistor (R3) parallel connection, then overall in parallel with described three-phase commutation bridge；4th resistance
(R-) in parallel with described three-phase commutation bridge after connecting with the 5th resistance (R+), the 4th resistance (R-) and the 5th resistance (R+) public
End connects the 6th resistance (SD).
2. peak overvoltage protection circuit according to claim 1 it is characterised in that：Described first diode (D1) and
The common port of two diodes (D2) is drawn and is connected line terminals as A.
3. peak overvoltage protection circuit according to claim 1 it is characterised in that：Described 3rd diode (D3) and
The common port of four diodes (D4) is drawn and is connected line terminals as B.
4. peak overvoltage protection circuit according to claim 1 it is characterised in that：Described 5th diode (D5) and
The common port of six diodes (D6) is drawn and is connected line terminals as C.
5. peak overvoltage protection circuit according to claim 1 it is characterised in that：One end of described 6th resistance (SD)
Connect the common port of the 4th resistance (R-) and the 5th resistance (R+), the other end is drawn as ground terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620888247.6U CN205945043U (en) | 2016-08-16 | 2016-08-16 | Peak overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620888247.6U CN205945043U (en) | 2016-08-16 | 2016-08-16 | Peak overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205945043U true CN205945043U (en) | 2017-02-08 |
Family
ID=57917797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620888247.6U Withdrawn - After Issue CN205945043U (en) | 2016-08-16 | 2016-08-16 | Peak overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205945043U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181240A (en) * | 2017-06-26 | 2017-09-19 | 中领世能（天津）科技有限公司 | Rectifier bridge protection circuit, over-pressure safety device and electric power system |
-
2016
- 2016-08-16 CN CN201620888247.6U patent/CN205945043U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181240A (en) * | 2017-06-26 | 2017-09-19 | 中领世能（天津）科技有限公司 | Rectifier bridge protection circuit, over-pressure safety device and electric power system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170208 Effective date of abandoning: 20180620 |
|
| AV01 | Patent right actively abandoned |