CN105162338A - Phase conversion overvoltage absorption device of thyristor rectification bridge and thyristor rectification circuit - Google Patents
Phase conversion overvoltage absorption device of thyristor rectification bridge and thyristor rectification circuit Download PDFInfo
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- CN105162338A CN105162338A CN201510522095.8A CN201510522095A CN105162338A CN 105162338 A CN105162338 A CN 105162338A CN 201510522095 A CN201510522095 A CN 201510522095A CN 105162338 A CN105162338 A CN 105162338A
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Abstract
The invention discloses a phase conversion overvoltage absorption device of a thyristor rectification bridge and a thyristor rectification circuit, relating to the technical field of thyristor rectification and aiming at providing a phase conversion peak overvoltage absorption device which can be used for effectively and rapidly absorbing peak overvoltage and also can be used for effectively reducing resistor loss, and a thyristor rectification circuit containing the same. According to the technical keys, the phase conversion overvoltage absorption device comprises a diode rectification bridge, a first resistor-capacitor module and a second resistor-capacitor module, wherein the diode rectification bridge is provided with a three-phase alternating-current input end used for connecting three-phase alternating current; the first resistor-capacitor module and the second resistor-capacitor module are connected in series and then connected between a positive output end and a negative output end of the diode rectification bridge; the first resistor-capacitor module comprises a first resistor and a first capacitor, and the first resistor and the first capacitor are connected in parallel; the second resistor-capacitor module comprises a second resistor and a second capacitor, and the second resistor and the second capacitor are connected in parallel; and the resistance value of the first resistor is at least 10 times of the resistance value of the second resistor, and the capacitance value of the first capacitor is at least 10 times of the capacitance value of the second capacitor.
Description
Technical field
The present invention relates to thyristor rectifier technical field, especially a kind of high-power thyristor rectifier bridge commutation overvoltage absorption plant.
Background technology
Thyristor rectifier bridge is the reversing arrangement that conventional interchange is converted into direct current.Generally help control rectifier bridge by six thyristor groups, see Fig. 1.This rectifier bridge in the application, due to the device property of thyristor, when thyristor turns off, can produce larger spike, be referred to as phase conversion overvoltage.This overvoltage needs to be undertaken suppressing and reducing by absorption circuit.
Existing absorption circuit is resistance-capacitance absorption loop.A resistance in parallel and an electric capacity on each thyristor in thyristor rectifier bridge, as the resistance R in Fig. 2, electric capacity C form absorption circuit, reduce the peak overvoltage on thyristor V1.Due to when thyristor V1 turns off, electric capacity C will be charged to the equal voltage of V1, and when V1 opens, electric capacity C sparks again, and for high voltage circuit, long-term charging, electric discharge can have a strong impact on the life-span of electric capacity C, also can increase loss.
If Fig. 3 is another kind of absorbing circuit, what the difference of itself and such scheme was that the resistance in resistance-capacitance absorption loop adopts is nonlinear resistance, but this kind of circuit in high voltage occasion because assimilation effect is poor, poor reliability, and seldom applying.
Another absorbing circuit is called concentrated resistance capaciting absorpting circuit, as Fig. 4.This circuit is to provide a diode rectifier bridge 5 and capacitance-resistance module 6 in parallel.The three-phase alternating current that transformer 1 exports is linked into the input of thyristor rectifier bridge 2, also be connected to the input of diode rectifier bridge 5 simultaneously, the positive output end of thyristor rectifier bridge 2 is connected to one end of load 4 by switch 3, the other end of load 4 is connected to the negative output terminal of thyristor rectifier bridge 2.Resistance R '
1with electric capacity C '
1between the positive and negative output being linked into diode rectifier bridge 5 after parallel connection.
Absorbing circuit no longer in parallel on thyristor in thyristor rectifier bridge 2 in Fig. 4, thyristor can produce commutation peak overvoltage when turning off and reflect on its input terminals, because rectifier bridge 5 is identical with the input terminal voltage of rectifier bridge 2, voltage on input and superposition spike phase conversion overvoltage in the above after rectifier bridge 5 rectification at the direct voltage of its output generating strap burr, with commutation peak voltage on direct voltage, after capacitance-resistance module 6 filtering, inhibit this peak voltage, thus inhibit the commutation peak voltage on thyristor rectifier bridge input.
This absorption plant Problems existing is, the timeconstantτ=R ' of capacitance-resistance module
1c '
1must certain value be less than, as a few tens of milliseconds, if time constant is comparatively large, then cannot absorb peak overvoltage.So, resistance R '
1value just can not be too large, electric capacity C '
1value can not be too little, otherwise assimilation effect is deteriorated.But as resistance R '
1on voltage higher, as several kilovolts, time, resistance R '
1loss very large, this can cause resistance R '
1heating is even burnt.
Summary of the invention
Technical problem to be solved by this invention is: for above-mentioned Problems existing, provides one can absorb peak overvoltage effectively fast, effectively can reduce again the commutation peak overvoltage absorption plant of resistance loss.
Thyristor rectifier bridge commutation overvoltage absorption plant in the present invention, comprises diode rectifier bridge, the first capacitance-resistance module and the second capacitance-resistance module;
Diode rectifier bridge has three-phase alternating current electrical input, for accessing three-phase alternating current;
Be connected between the positive output end of diode rectifier bridge and negative output terminal after first capacitance-resistance module and the second capacitance-resistance block coupled in series;
First capacitance-resistance module comprises the first resistance and the first electric capacity, the first resistance and the first Capacitance parallel connection; Second capacitance-resistance module comprises the second resistance and the second electric capacity, the second resistance and the second Capacitance parallel connection;
The resistance of the first resistance is at least 10 times of the resistance of the second resistance, and the capacitance of the first electric capacity is at least 10 times of the capacitance of the second electric capacity.
Preferably, described diode rectifier bridge comprises 6 fast diodes.
Preferably, the span of the first resistance is 10 kilohms ~ 100 kilohms, the capacitance span of the first electric capacity is 10 microfarad ~ 100 microfarads, and the resistance span of the second resistance is 1 kilohm ~ 10 kilohms, and the capacitance span of the second electric capacity is 1 microfarad ~ 10 microfarad.
Preferably, the time constant of the first capacitance-resistance module is 100 milliseconds ~ 10 seconds; The time constant of the second capacitance-resistance module is 1 millisecond ~ 100 milliseconds.
Scr rectification circuit in the present invention, comprises thyristor rectifier bridge, diode rectifier bridge, the first capacitance-resistance module and the second capacitance-resistance module;
Thyristor rectifier bridge has three-phase alternating current electrical input, for accessing three-phase alternating current; The output of thyristor rectifier bridge is used for powering to the load;
Diode rectifier bridge has three-phase alternating current electrical input, and the three-phase alternating current electrical input of diode rectifier bridge is connected with the three-phase alternating current electrical input of thyristor rectifier bridge;
Be connected between the positive output end of diode rectifier bridge and negative output terminal after first capacitance-resistance module and the second capacitance-resistance block coupled in series;
First capacitance-resistance module comprises the first resistance and the first electric capacity, the first resistance and the first Capacitance parallel connection; Second capacitance-resistance module comprises the second resistance and the second electric capacity, the second resistance and the second Capacitance parallel connection;
The resistance of the first resistance is at least 10 times of the resistance of the second resistance, and the capacitance of the first electric capacity is at least 10 times of the capacitance of the second electric capacity.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
The invention provides one group of capacitance-resistance module and bear most commutating DC voltage, because resistance is comparatively large, loss obviously reduces; There is provided another group capacitance-resistance module to absorb commutation peak overvoltage, because time constant is little, thus effectively suppress high-power thyristor rectifier bridge commutation spike, whole structure reduces the loss of absorbing circuit simultaneously.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the circuit structure of thyristor rectifier bridge.
Fig. 2 is resistance capaciting absorpting circuit of the prior art.
Fig. 3 is another group resistance capaciting absorpting circuit in prior art.
Fig. 4 is concentrated resistance capaciting absorpting circuit of the prior art.
Fig. 5 is circuit theory diagrams of the present invention.
Fig. 6 is the circuit structure of diode rectifier bridge in the present invention.
Mark in figure:
1 is transformer; 2 is thyristor rectifier bridge; 3 is switch; 4 is load; 5 is diode rectifier bridge; 6 is capacitance-resistance module of the prior art; 7 is the first capacitance-resistance module; 8 is the second capacitance-resistance module.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
As Fig. 5, circuit structure of the present invention comprises diode rectifier bridge 5, first capacitance-resistance module 7 and the second capacitance-resistance module 8.
Wherein diode rectifier bridge 5 comprises 6 diodes, is preferably fast diode.These 6 diodes form three branch roads in parallel, often branch road is in series with two diodes, and the anode of diode wherein under the negative electrode of upper diode is connected to, to connect at the anode of upper diode in three branch roads again and form the negative output terminal of diode rectifier bridge 5, by three branch roads under the negative electrode of diode be joined together to form the positive output end of diode rectifier bridge 5.In each branch road, the points of common connection of two diodes is an input of diode rectifier bridge 5, and the phase in the three-phase voltage that access transformer 1 exports, as Fig. 6.
After first capacitance-resistance module 7 is connected with the second capacitance-resistance module 8 between the positive and negative output being connected to diode rectifier bridge 5.
Wherein the first capacitance-resistance module 7 comprises resistance R1 in parallel and electric capacity C1, and the second capacitance-resistance module 8 comprises resistance R2 in parallel and electric capacity C2.The resistance of resistance R1 is at least 10 times of the resistance of resistance R2, and the capacitance of electric capacity C1 is at least 10 times of the capacitance of electric capacity C2.
In a preferred embodiment, the span of resistance R1 is 10 kilohms ~ 100 kilohms (K Ω), the span of electric capacity C1 is 10 microfarad ~ 100 microfarads (μ F), the span of resistance R2 is the span of 1K Ω ~ 10K Ω, electric capacity C2 is 1 μ F ~ 10 μ F.
Continue see Fig. 5, during use, the three-phase electricity that transformer 1 exports is linked into the three-phase alternating current electrical input of thyristor rectifier bridge 2, also be connected to the three-phase alternating current electrical input of diode rectifier bridge 5 simultaneously, the positive output end of thyristor rectifier bridge 2 is connected to one end of load 4 by switch 3, the other end of load 4 is connected to the negative output terminal of thyristor rectifier bridge 2.
Can peak overvoltage be produced when thyristor rectifier bridge 2 turns off and be superimposed upon on its input voltage, the voltage of the input of diode rectifier bridge 5 is identical with the voltage of the input of thyristor rectifier bridge 2, therefore the overvoltage of commutation spike is also embodied on the input of diode rectifier bridge 5, the output of diode rectifier bridge 5 is made to contain DC component and alternating current component, DC component numerical value is generally 1.35 times of rectifier bridge three-phase alternating current input voltage effective value, alternating current component is generally the narrow spike amount of peak value, its numerical value is generally the 0.5-1 of rectifier bridge three-phase alternating current input voltage amplitude doubly, alternating current component contains peak voltage, must be suppressed.In order to reach this object, the time constant in capacitance-resistance module 7 and resistance value are all enough large, and in capacitance-resistance module 7, time constant and resistance value are all enough little.
Concrete, when the capacitance of electric capacity C1 is the decades of times of the capacitance of electric capacity C2, the peak voltage of more than 90% will be added in capacitance-resistance module 8, the resistance of adjusting resistance R2 and the capacitance of electric capacity C2 can make the time constant of capacitance-resistance module 8 be several milliseconds, thus sponge peak overvoltage fast and effectively.
When the resistance of resistance R1 is the decades of times of resistance R2, diode rectifier bridge 5 export more than 90% direct voltage will be applied in capacitance-resistance module 7.Again due to the resistance R ' in the resistance R1 resistance hinge structure in capacitance-resistance module 7
1improve decades of times, therefore loss is reduced to 1/tens of original loss.The resistance of adjusting resistance R1 and the resistance of electric capacity C1 can make the time constant of capacitance-resistance module 7 reach hundreds of millisecond.
Visible, in the present invention, the power consumption of capacitance-resistance module is little, and it is strong to absorb spike ability, and cost is low, has wide market prospects.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (8)
1. a thyristor rectifier bridge commutation overvoltage absorption plant, is characterized in that, comprise diode rectifier bridge, the first capacitance-resistance module and the second capacitance-resistance module;
Diode rectifier bridge has three-phase alternating current electrical input, for accessing three-phase alternating current;
Be connected between the positive output end of diode rectifier bridge and negative output terminal after first capacitance-resistance module and the second capacitance-resistance block coupled in series;
First capacitance-resistance module comprises the first resistance and the first electric capacity, the first resistance and the first Capacitance parallel connection; Second capacitance-resistance module comprises the second resistance and the second electric capacity, the second resistance and the second Capacitance parallel connection;
The resistance of the first resistance is at least 10 times of the resistance of the second resistance, and the capacitance of the first electric capacity is at least 10 times of the capacitance of the second electric capacity.
2. a kind of thyristor rectifier bridge commutation overvoltage absorption plant according to claim 1, it is characterized in that, described diode rectifier bridge comprises 6 fast diodes.
3. a kind of thyristor rectifier bridge commutation overvoltage absorption plant according to claim 1 and 2, it is characterized in that, the span of the first resistance is 10 kilohms ~ 100 kilohms, the capacitance span of the first electric capacity is 10 microfarad ~ 100 microfarads, the resistance span of the second resistance is 1 kilohm ~ 10 kilohms, and the capacitance span of the second electric capacity is 1 microfarad ~ 10 microfarad.
4. a kind of thyristor rectifier bridge commutation overvoltage absorption plant according to claim 3, is characterized in that, the time constant of the first capacitance-resistance module is 100 milliseconds ~ 10 seconds; The time constant of the second capacitance-resistance module is 1 millisecond ~ 100 milliseconds.
5. a scr rectification circuit, is characterized in that, comprises thyristor rectifier bridge, diode rectifier bridge, the first capacitance-resistance module and the second capacitance-resistance module;
Thyristor rectifier bridge has three-phase alternating current electrical input, for accessing three-phase alternating current; The output of thyristor rectifier bridge is used for powering to the load;
Diode rectifier bridge has three-phase alternating current electrical input, is connected with the three-phase alternating current electrical input of thyristor rectifier bridge;
Be connected between the positive output end of diode rectifier bridge and negative output terminal after first capacitance-resistance module and the second capacitance-resistance block coupled in series;
First capacitance-resistance module comprises the first resistance and the first electric capacity, the first resistance and the first Capacitance parallel connection; Second capacitance-resistance module comprises the second resistance and the second electric capacity, the second resistance and the second Capacitance parallel connection;
The resistance of the first resistance is at least 10 times of the resistance of the second resistance, and the capacitance of the first electric capacity is at least 10 times of the capacitance of the second electric capacity.
6. a kind of scr rectification circuit according to claim 5, is characterized in that, described diode rectifier bridge comprises 6 fast diodes.
7. a kind of scr rectification circuit according to claim 5 or 6, it is characterized in that, the span of the first resistance is 10 kilohms ~ 100 kilohms, the capacitance span of the first electric capacity is 10 microfarad ~ 100 microfarads, the resistance span of the second resistance is 1 kilohm ~ 10 kilohms, and the capacitance span of the second electric capacity is 1 microfarad ~ 10 microfarad.
8. a kind of scr rectification circuit according to claim 7, is characterized in that, the time constant of the first capacitance-resistance module is 100 milliseconds ~ 10 seconds; The time constant of the second capacitance-resistance module is 1 millisecond ~ 100 milliseconds.
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|---|---|---|---|
| CN201510522095.8A CN105162338B (en) | 2015-08-24 | 2015-08-24 | Thyristor rectifier bridge commutation overvoltage absorption plant and scr rectification circuit |
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|---|---|---|---|
| CN201510522095.8A CN105162338B (en) | 2015-08-24 | 2015-08-24 | Thyristor rectifier bridge commutation overvoltage absorption plant and scr rectification circuit |
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| CN105162338A true CN105162338A (en) | 2015-12-16 |
| CN105162338B CN105162338B (en) | 2018-09-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62293930A (en) * | 1986-06-11 | 1987-12-21 | 株式会社 エスピ−プランニング | Power controller |
| JPH1064658A (en) * | 1996-08-22 | 1998-03-06 | Mitsubishi Electric Corp | Leakage current detector for lightning arrester of thyristor valve |
| CN201167286Y (en) * | 2007-07-26 | 2008-12-17 | 黄大可 | Combined resistance-capacitance absorber of linearity and non-linearity |
| CN203312791U (en) * | 2013-06-04 | 2013-11-27 | 安徽一天电气技术有限公司 | Rectification type capacitance-resistance absorbing device |
| CN204103754U (en) * | 2014-08-04 | 2015-01-14 | 镇江大全赛雪龙牵引电气有限公司 | Orbit traffic direct current traction rectifier device overvoltage protection |
| CN204947915U (en) * | 2015-08-24 | 2016-01-06 | 东方电机控制设备有限公司 | Thyristor rectifier bridge commutation overvoltage absorption plant and scr rectification circuit |
-
2015
- 2015-08-24 CN CN201510522095.8A patent/CN105162338B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62293930A (en) * | 1986-06-11 | 1987-12-21 | 株式会社 エスピ−プランニング | Power controller |
| JPH1064658A (en) * | 1996-08-22 | 1998-03-06 | Mitsubishi Electric Corp | Leakage current detector for lightning arrester of thyristor valve |
| CN201167286Y (en) * | 2007-07-26 | 2008-12-17 | 黄大可 | Combined resistance-capacitance absorber of linearity and non-linearity |
| CN203312791U (en) * | 2013-06-04 | 2013-11-27 | 安徽一天电气技术有限公司 | Rectification type capacitance-resistance absorbing device |
| CN204103754U (en) * | 2014-08-04 | 2015-01-14 | 镇江大全赛雪龙牵引电气有限公司 | Orbit traffic direct current traction rectifier device overvoltage protection |
| CN204947915U (en) * | 2015-08-24 | 2016-01-06 | 东方电机控制设备有限公司 | Thyristor rectifier bridge commutation overvoltage absorption plant and scr rectification circuit |
Non-Patent Citations (1)
| Title |
|---|
| 姚永红: "《浅析晶闸管整流装置的保护》", 《四川水泥》 * |
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| CN105162338B (en) | 2018-09-18 |
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Effective date of registration: 20181126 Address after: 618000 No. 18, Third Section of Lushan South Road, Deyang City, Sichuan Province Co-patentee after: Dongfang Electric Group Dongfang Motor Co., Ltd. Patentee after: Dongfang Electric Automatic Control Engineering Co., Ltd. Address before: 618000 No. 138 Jialing Jiangxi Road, Deyang City, Sichuan Province Co-patentee before: Dongfang Electric Group Dongfang Motor Co., Ltd. Patentee before: DFEM Control Equipment Co., Ltd. |