CN202663374U - Medium and high voltage series connection electronic switch - Google Patents
Medium and high voltage series connection electronic switch Download PDFInfo
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- CN202663374U CN202663374U CN 201220220977 CN201220220977U CN202663374U CN 202663374 U CN202663374 U CN 202663374U CN 201220220977 CN201220220977 CN 201220220977 CN 201220220977 U CN201220220977 U CN 201220220977U CN 202663374 U CN202663374 U CN 202663374U
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- resistance
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- branch road
- voltage balancing
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Abstract
The utility model discloses a medium and high voltage series connection electronic switch, which comprises a main power electronic switch module, a basic dynamic voltage-sharing resistance-capacitance branch consisting of a nonpolarity capacitor (C1) and a resistor (R1) which are connected in series, an H-bridge diode rectification module, an affiliated dynamic voltage-sharing resistance-capacitance branch, a discharge resistor and a surge absorption module, wherein the input end of the H-bridge diode rectification module is connected with the basic dynamic voltage-sharing resistance-capacitance branch, and the output end of the H-bridge diode rectification module is connected with the affiliated dynamic voltage-sharing resistance-capacitance branch; two ends of the affiliated dynamic voltage-sharing resistance-capacitance branch are connected in parallel with the surge absorption module (MOV); the affiliated dynamic voltage-sharing resistance-capacitance branch consists of a capacitor (C2) and a current limiting resistor (R2); and two ends of the capacitor (C2) are connected in parallel with the discharge resistor (Rp). By the medium and high voltage series connection electronic switch, under the condition that the power consumption of the resistance-capacitance branches is not increased, the general dynamic voltage-sharing requirement can be met, and a requirement on short-time voltage impact absorption can be met; and the medium and high voltage series connection electronic switch is long in service life and high in self-adaptation level.
Description
Technical field
The utility model relates to a kind of electronic switch, especially relates to a kind of novel electron switch that is applied to the high voltage appearance electric power system.
Background technology
Along with the development of fine chemistry industry and new high-tech industry, the user has presented different levels to the demand of the quality of power supply, and power quality problem is huge on the impact of sensitive load.Voltage, frequency, waveform are the standards of weighing the quality of power supply, exceed the frequency of certain limit or the distortion of voltage deviation or waveform, all can bring bad impact to the safety of power consumer and electrical network, economical operation etc.Voltage falls and the short time voltage outage accounts for about 90% of all power quality problems.When voltage be lower than rated value 90% the time, the operation of sensitive loads brings huge potential safety hazard and economic loss with influenced.Therefore, improvement voltage falls and short time voltage is interrupted, and improves the quality of power supply and has extremely important effect and long-range meaning.
Switching device all is the important topic of electric device research as the pith of switching circuit for a long time.Traditional mechanical switch is used very extensive from the low-voltage-grade to the voltage levels through for a long time research application.The mechanical switch conducting is stable, and carrying load ability is strong.The shortcoming of mechanical switch is very obvious, at first needs very large arc-control device, makes the volume of switch generally all larger, and next speed of cut-offfing is subjected to the restriction of mechanical action partial velocity, and the mechanical switch electrical endurance is subject to the restriction of open and close times in addition.Therefore be difficult to satisfy some power consumers to the requirement of the quality of power supply.Along with the development of power electronic device technology, the switch speed of controlled power electronic device is more and more faster, and withstand voltage level is more and more higher, and electric current is increasing.Replace mechanical switch with this, as the switch of electric power system, can reach the switch speed of Millisecond, be suitable for some sensitive users strict to the quality of power supply.This technology is used widely in the low pressure occasion at present.But the mesohigh occasion for example during 10KV Related product less.
For example during 10KV, because single device withstand voltage grade can't reach requirement, therefore must adopt the structure of series connection or cascade for the mesohigh application scenario.Because static characteristic and the dynamic parameter of power electronic device are incomplete same, when therefore series connection is used, may occur that device misleads or the problem such as anti-phase puncture.
Take thyristor as example, under blocking, the leakage current characteristic of thyristor is different, and the voltage that bears after the series connection is also different; In the thyristor turn off process, the difference of QRR also may cause valve builtin voltage skewness.Therefore when Thyristors in series, even send simultaneously the thyristor control signal, each thyristor action also may be inconsistent.The thyristor of rear closure can bear more system voltage, causes the overvoltage damage.Therefore need to select suitable capacitance-resistance loop parameter, the dynamic voltage balancing function when realizing the change of current of mesohigh series thyristor valve.Various studies show that, it is larger that the electric capacity in the dynamic voltage-balancing is chosen, and it is less that resistance is chosen, and it is stronger to the surge voltage absorbability, and response is faster.Otherwise but electric capacity is larger, and the power consumption of capacitance-resistance branch road is also larger, and resistance is less, and the rush of current during capacitor discharge is also just larger, is difficult in design satisfactory to both parties.
The utility model content
Technical problem to be solved in the utility model just is to provide the mesohigh series connection that the strong response of a kind of Absorption Current surge capacity is rapid and rush of current is less electronic switch.
Solve the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
A kind of mesohigh series connection electronic switch, comprise main electronic power switch module and basic dynamic voltage balancing capacitance-resistance branch road, described basic dynamic voltage balancing capacitance-resistance props up route polarity free capacitor (C1) and resistance (R1) is composed in series, it is characterized in that: also be provided with H bridge diode rectification module, attached dynamic voltage balancing capacitance-resistance branch road, discharge resistance and surge absoption module, described H bridge diode rectification module is by four diode (VT1, VT2, VT3, VT4) form, the input of described H bridge diode rectification module links to each other with basic dynamic voltage balancing capacitance-resistance branch road, output links to each other with attached dynamic voltage balancing capacitance-resistance branch road, attached dynamic voltage balancing capacitance-resistance branch road two ends also are parallel with surge absoption module (MOV), described attached dynamic voltage balancing capacitance-resistance props up route electric capacity (C2) and current-limiting resistance (R2) is composed in series, the capacitor C 2 of described attached dynamic voltage balancing capacitance-resistance branch road) two ends also in parallel discharge resistance (Rp).
Described electric capacity (C2) is for having electrochemical capacitor or the non-polar electric capacity of polarity.
Also be in series with controllable electronic switch (K) on discharge resistance (Rp) branch road of described attached dynamic voltage balancing capacitance-resistance branch road.
The controlled electronic power switch T1 of described main electronic power switch module is triode thyristor or gate level turn-off thyristor GTO, power transistor GTR, field of electric force effect transistor, igbt.
The utility model can be applicable in solid state switch or other electric equipments based on series connection electronic power switch topology, the solid-state switch principle is as follows: main power supply and available power supply are received respectively in the load by the solid-state electronic change over switch, system moves in the main power supply side at ordinary times, when it voltage occurs and falls, system automatically by the solid-state electronic change over switch the load switching to stand-by power supply.When the master power supply is normal, the master power supply that automaticallyes switch back again, thus the realization quality of power supply is effectively controlled.
The switching branches of solid-state switch is by main electronic power switch module and dynamic voltage balancing module composition.On topological structure, this device adopts cascaded structure, and the number of series unit is determined by the electric pressure of power supply.Each series unit comprises a main electronic power switch module and a dynamic voltage balancing module, and the dynamic voltage balancing module of this device is comprised of basic dynamic voltage balancing capacitance-resistance branch road, H bridge diode rectification module, attached dynamic voltage balancing capacitance-resistance branch road, discharge resistance and surge absoption module.Wherein, basic dynamic voltage balancing capacitance-resistance is propped up the less polarity free capacitor C1 of route capacity and resistance R 1 is composed in series.H bridge diode rectification module is comprised of four diode VT1, VT2, VT3, VT4.H bridge diode rectification module input links to each other with basic dynamic voltage balancing capacitance-resistance branch road, and the output of H bridge diode rectification module links to each other with attached dynamic voltage balancing capacitance-resistance branch road, simultaneously surge absoption module MOV in parallel.Surge absoption module MOV can absorb the voltge surge that thunder and lightning or inductive load impact etc. cause.Attached dynamic voltage balancing capacitance-resistance props up route capacity larger capacitor C 2 and less current-limiting resistance R2 is composed in series.Wherein capacitor C 2 two ends parallel connections discharge resistance Rp.Capacitor C 2 can be the electrochemical capacitor that polarity is arranged, and also can be non-polar electric capacity.
As shown in Figure 3, when switch T1 two ends produce surge voltage U1 since the parallel connection of T1 two ends basic dynamic voltage-balancing R1/C1, will absorb a part of surge voltage.When surge voltage U1 surpasses capacitor C 2 both end voltage Uc2, the conducting of H bridge diode rectification module.For example, if U1 as shown direction for just, then diode VT1, VT2 conducting.C2 absorbs electric charge by VT1, VT2, R2 branch road, plays the burning voltage effect.If U1 is for bearing then diode VT3, VT4 conducting.C2 absorbs electronic switch two ends surge voltage by VT3, VT4, the charging of R2 branch road.
Because additional dynamic voltage balancing RC branch road is by diode rectification module access electronic switch two ends.Therefore, the C2 stored energy can not inversion be returned main electronic switch side.So the C2 discharge can not impacted main electronic power switch generation current.The C2 stored energy discharges by resistance R p.This discharge resistance resistance is very large, and therefore discharge slowly for example can be arranged to tens seconds.Although therefore capacitor C 2 is larger, this branch road population mean power consumption is very little.Adopt air-cooled design to get final product.
Mesohigh series connection electronic switch most of the time dynamic voltage balancing branch road only need to satisfy the dynamic voltage balancing demand in the thyristor converter process.Dynamic voltage balancing demand at this moment is relevant with thyristor parameters at different levels, system's voltage withstand class, the series connection progression of series connection, generally can rule of thumb choose by tabling look-up.Consider power consumption, the appearance value is generally less than 1uf, so the absorbing surge voltge surge is limited in one's ability.When system is subject at unpredictable external disturbance, may produce larger voltge surge, exceed the absorbability of basic dynamic voltage balancing capacitance-resistance branch road.Need extra absorption module this moment.This extra absorption module requires: only just automatically put into operation when larger voltge surge produces, speed is fast, and is low in energy consumption, and the life-span is long.Conventional surge absoption module MOV can't satisfy system requirements.
The utility model adopts the attached dynamic voltage balancing module based on H bridge diode rectification module.According to parameter designing, its absorbing surge ability substantially exceeds the absorbability of common capacitance-resistance branch road, and just can access when only in system larger voltge surge occuring because the general design of discharge constant is very large, so the most of the time do not work, loss is very little.
The utility model has adopted a kind of novel dynamic voltage balancing topology.Attached dynamic voltage balancing module based on H bridge diode rectification module in parallel on traditional capacitance-resistance equalizer circuit.Adopt the solid-state switch of this structure when conventional operation, basic dynamic voltage balancing capacitance-resistance branch road puts into operation, and its power consumption is little, and attached dynamic voltage balancing module does not put into operation, and power consumption is almost 0.When some unpredictable short time voltages impacts appear in system, basic dynamic voltage balancing group is held branch road can't absorb the voltge surge that exceeds the quata, this moment, attached dynamic voltage balancing module put into operation, because its electric capacity is larger, current-limiting resistance is less, therefore the absorbing surge ability substantially exceeds the absorbability of common capacitance-resistance branch road, and the energy of attached dynamic voltage balancing capacitor memory storage is by the absorption resistance slow release afterwards, discharge complete after absorbing surge voltage again.
Beneficial effect: the dynamic voltage balancing topology that the utility model proposes a kind of novel mesohigh series connection electronic switch, it can overcome the defective of traditional dynamic voltage balancing capacitance-resistance branch road parameter designing, so that system is under the condition that does not increase capacitance-resistance branch road power consumption, both can satisfy general dynamic voltage balancing requirement, can satisfy again the requirement to the short time voltage impact absorption.Its life-span is long, the self adaptation degree is high.Following advantage is specifically arranged:
1. system can realize the absorbability of larger dynamic impulsion voltage under the condition that does not increase the dynamic voltage-balancing power consumption.
2. owing to adopt rectifier bridge module, attached dynamic voltage balancing branch road is direct current, thus its electric capacity can adopt with volume little, the electrochemical capacitor that capacitance is large.The type selecting scope is large, and cost is low.
3. can optimize the parameter designing of basic dynamic voltage balancing capacitance-resistance branch road.Can choose less electric capacity and larger resistance.Thereby power consumption is lower, and is less to the impact of switching device.
4. the Surge suppression module MOV that compares commonly used, its input speed is faster, and the life-span is longer.
5. because additional dynamic voltage balancing RC branch road accesses the electronic switch two ends by the diode rectification module.Therefore, the energy on the electric capacity can not flow back to the electronic switch branch road by resistance R 2, has therefore avoided the circuit impact of capacitor discharge to electronic switch.
Description of drawings
Fig. 1 is the application of solid state switch in electric power system;
Fig. 2 is basic dynamic voltage-balancing topology;
Fig. 3 is composition and the connection diagram of mesohigh series connection electronic switch embodiment one of the present utility model;
Fig. 4 is in real time adjustable composition and connection diagrams of mesohigh series connection electronic switch embodiment two discharge parameters of the present utility model.
Embodiment
Be illustrated in figure 1 as the application of solid state switch in electric power system, main power supply and available power supply are received respectively in the load by the solid-state electronic change over switch, under normal circumstances, system moves in the main power supply side, when it voltage occurs and falls, system automatically by the solid-state electronic change over switch the load switching to stand-by power supply.When the master power up is normal, the master power supply that automaticallyes switch back again, thus the realization quality of power supply is effectively controlled.
As shown in Figure 2, be the circuit topology of existing series connection electronic switch dynamic voltage-balancing, its dynamic voltage balancing function is made of capacitor C 1, resistance R 1.In cascaded structure, the service time of main electronic switch is difference to some extent.Thereby cause the voltage skewness, cause device loss.By the equalizer circuit that RC forms, can make opening process balanced, thereby avoid voltage entirely to be added on the thyristor of first conducting.When system was impacted by inductive load, main electronic switch two ends can produce the super large overvoltage, exceed capacitor C 1 absorbability, device is produced damage easily.The method that reduces voltage overshoot is the capacity that increases equalizing capacitance.But capacitor's capacity increases, and can increase the branch road heat power consumption, causes the thermal design difficulty, and cost raises, and device volume increases.And if capacitor C 1 is larger, when the thyristor conducting, the energy of capacitive absorption will discharge by main electronic switch within very short time in the dynamic voltage balancing process, thereby electronic switch is caused rush of current.If increase R1, but the impulse current when limit switch is opened.But dynamically the response speed of branch road can slow down.In sum, traditional dynamic voltage balancing resistance-capacitance circuit topological parameter difficult design is difficult to satisfactory to both parties.
Mesohigh of the present utility model series connection electronic switch embodiment one comprises the unit that is made of main electronic power switch module and basic dynamic voltage balancing capacitance-resistance branch road of 3 series connection as shown in Figure 3.
In each unit: the controlled electronic power switch T1 of main electronic power switch module is triode thyristor or gate level turn-off thyristor GTO, power transistor GTR, the field of electric force effect transistor, igbt, basic dynamic voltage balancing capacitance-resistance props up route polarity free capacitor C1 and resistance R 1 is composed in series, in addition, also be provided with H bridge diode rectification module, attached dynamic voltage balancing capacitance-resistance branch road, discharge resistance and surge absoption module, H bridge diode rectification module is by four diode VT1, VT2, VT3, VT4 forms, the input of H bridge diode rectification module links to each other with basic dynamic voltage balancing capacitance-resistance branch road, output links to each other with attached dynamic voltage balancing capacitance-resistance branch road, attached dynamic voltage balancing capacitance-resistance branch road two ends also are parallel with surge absoption module MOV, attached dynamic voltage balancing capacitance-resistance props up route capacitor C 2 and current-limiting resistance R2 is composed in series, capacitor C 2 two ends of attached dynamic voltage balancing capacitance-resistance branch road are also in parallel discharge resistance Rp, capacitor C 2 is for having electrochemical capacitor or the non-polar electric capacity of polarity.
This improved topological circuit has added H bridge diode rectification module and attached dynamic voltage balancing capacitance-resistance branch road on the original basic basis of the RC series average-voltage of topology of all pressing.The R2 of attached dynamic voltage balancing capacitance-resistance branch road, the C2 circuit, wherein the discharge resistance of C2 is Rp.
Owing to added H bridge diode rectification module, the C2 two ends are direct voltages, and shown in figure three, system is when steady operation, and the magnitude of voltage Uc2 at C2 two ends is stabilized near the maximum of the surge voltage that R1/C1 bears.Therefore stable in power factor, system is during without additional impact, and R2/C2 does not come into operation.For example large inductive load impacts when there is larger voltge surge in system, during thunderbolt).Exceeded the absorption region of R1/C1 by surge voltage, the Ud absolute value will be greater than Uc2, and the conducting of diode rectification module to the C2 charging, is played the effect of absorbing surge voltage.Wherein when Ud as shown direction be timing, diode VT1, VT2 conducting.Ud as shown direction when negative, diode VT3, VT4 conducting.After C2 absorbed charging, its stored energy can't be returned main circuit by the inversion of diode rectification module, therefore can not impact main electronic switch generation current.The energy of C2 only discharges by resistance R p.Along with energy discharge, the C2 both end voltage descends, and again possesses absorbability.By rational parameter designing, can be so that the frequency of utilization of attached dynamic voltage-balancing be compared R1, C1 is much smaller, even therefore the appearance value strengthens, average power consumption is still less.
Because the R2/C2 branch road does not impact main electronic switch generation current, so the comparable R1 of R2 is little a lot, and the response speed of R2/C2 branch road will be faster.Because the C2 two ends are direct voltage, therefore can select the cheap electrochemical capacitor of large capacity simultaneously.
The shortcoming of attached dynamic voltage balancing capacitance-resistance branch road is because Rp is very large, and the discharge constant of C2 is generally larger, causes voltge surge to last long or frequency when higher, can't play a role.
Solution mesohigh series connection electronic switch embodiment two of the present utility model as shown in Figure 4 just is to reduce the Rp resistance with embodiment one difference, and is connected in parallel on the C2 two ends behind the series connection controllable electronic switch K again.By control electronic switch K, can dynamically change the discharge constant of C2 according to the demand of system's surge absoption, thereby reach balance aspect switching frequency and the power consumption.
Claims (4)
1. mesohigh series connection electronic switch, comprise main electronic power switch module and basic dynamic voltage balancing capacitance-resistance branch road, described basic dynamic voltage balancing capacitance-resistance props up route polarity free capacitor (C1) and resistance (R1) is composed in series, it is characterized in that: also be provided with H bridge diode rectification module, attached dynamic voltage balancing capacitance-resistance branch road, discharge resistance and surge absoption module, described H bridge diode rectification module is by four diode (VT1, VT2, VT3, VT4) form, the input of described H bridge diode rectification module links to each other with basic dynamic voltage balancing capacitance-resistance branch road, output links to each other with attached dynamic voltage balancing capacitance-resistance branch road, attached dynamic voltage balancing capacitance-resistance branch road two ends also are parallel with surge absoption module (MOV), described attached dynamic voltage balancing capacitance-resistance props up route electric capacity (C2) and current-limiting resistance (R2) is composed in series, and electric capacity (C2) two ends of described attached dynamic voltage balancing capacitance-resistance branch road are also in parallel discharge resistance (Rp).
2. mesohigh according to claim 1 series connection electronic switch, it is characterized in that: described electric capacity (C2) is for having electrochemical capacitor or the non-polar electric capacity of polarity.
3. mesohigh series connection electronic switch according to claim 2 is characterized in that: also be in series with controllable electronic switch (K) on discharge resistance (Rp) branch road of described attached dynamic voltage balancing capacitance-resistance branch road.
4. mesohigh according to claim 3 series connection electronic switch, it is characterized in that: the controlled electronic power switch T1 of described main electronic power switch module is triode thyristor or gate level turn-off thyristor GTO, power transistor GTR, field of electric force effect transistor, igbt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220977 CN202663374U (en) | 2012-05-17 | 2012-05-17 | Medium and high voltage series connection electronic switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220977 CN202663374U (en) | 2012-05-17 | 2012-05-17 | Medium and high voltage series connection electronic switch |
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| CN202663374U true CN202663374U (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220220977 Withdrawn - After Issue CN202663374U (en) | 2012-05-17 | 2012-05-17 | Medium and high voltage series connection electronic switch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710244A (en) * | 2012-05-17 | 2012-10-03 | 广东电网公司电力科学研究院 | Middle-high voltage series-connection electronic switch |
| CN103986147A (en) * | 2014-05-27 | 2014-08-13 | 深圳市中兴移动通信有限公司 | Power supply and switching tube protection circuit thereof |
-
2012
- 2012-05-17 CN CN 201220220977 patent/CN202663374U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710244A (en) * | 2012-05-17 | 2012-10-03 | 广东电网公司电力科学研究院 | Middle-high voltage series-connection electronic switch |
| CN103986147A (en) * | 2014-05-27 | 2014-08-13 | 深圳市中兴移动通信有限公司 | Power supply and switching tube protection circuit thereof |
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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: 20130109 Effective date of abandoning: 20160511 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |