CN203984236U - A kind of protection of the voltage dip for mesohigh DC load equipment - Google Patents
A kind of protection of the voltage dip for mesohigh DC load equipment Download PDFInfo
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- CN203984236U CN203984236U CN201420276631.1U CN201420276631U CN203984236U CN 203984236 U CN203984236 U CN 203984236U CN 201420276631 U CN201420276631 U CN 201420276631U CN 203984236 U CN203984236 U CN 203984236U
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Abstract
The utility model discloses a kind of protection of the voltage dip for mesohigh DC load equipment; comprise BoostDC/DC converter, single chip machine controlling circuit and the output diode of two-way crisscross parallel; the output of single chip machine controlling circuit is connected with the BoostDC/DC converter of two-way crisscross parallel, and the output of the BoostDC/DC converter of two-way crisscross parallel connects output diode.The utility model can be used for medium-high voltage frequency converter, the not only current stress of cpable of lowering power pipe of the Boost topological structure of two-way crisscross parallel, be conducive to circuit and select little electric current, high performance power tube (type selecting of power tube is more extensive), can also reduce to export the ripple of total current, extend the life-span of output capacitance, also improved the power grade of converter.
Description
Technical field
The utility model relates to a kind of frequency converter control system of industry spot, be specifically related to a kind of mesohigh voltage dip protection equipment of anti-shake electricity.
Background technology
At present, the greatest problem that the frequency converter control system of most industry spot faces is exactly that anti-shake power is poor, main manifestations in the following areas: 1) the anti-shake power of control circuit is poor, in the time that electricity appears shaking in industry spot, control circuit dead electricity, frequency converter just quits work.2) the anti-shake power of frequency converter itself is poor, in the time that industry spot alternating voltage moment is fallen, and frequency converter meeting under-voltage protection, thus cause the motor that frequency converter drags to quit work; In the time that voltage recovers, frequency converter can restart.This is the inherent characteristic of frequency converter itself, and frequency converter all exists this problem substantially.
The anti-shake electric protection equipment of frequency converter in the market all can only be for the protection of low voltage frequency converter; and existing increasing medium-high voltage frequency converter is being worked in industry spot; cannot protect medium-high voltage frequency converter to avoid shaking electric impact for current existing voltage dip protection equipment, therefore a kind of exploitation of the protection of the voltage dip for mesohigh DC load equipment is necessary.
Utility model content
Utility model object: technical problem to be solved in the utility model is to provide a kind of voltage dip protection equipment of mesohigh DC load, and this protection equipment can solve the poor problem of the anti-shake power of medium-high voltage frequency converter.
Utility model content: for solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of protection of the voltage dip for mesohigh DC load equipment; comprise Boost DC/DC converter, single chip machine controlling circuit and the output diode of two-way crisscross parallel; the output of described single chip machine controlling circuit is connected with the Boost DC/DC converter of described two-way crisscross parallel, and the output of the Boost DC/DC converter of described two-way crisscross parallel connects described output diode.
Further preferably, also comprise RS-485 communication interface and human-computer interaction interface; Described human-computer interaction interface is connected with described single chip machine controlling circuit by RS-485 interface.
Further preferably, described single chip machine controlling circuit adopts single-chip microcomputer PIC16F72.
Further preferably, the power tube of the Boost DC/DC converter of described two-way crisscross parallel is all selected the IGBT of Infineon module.
Beneficial effect: than prior art, mesohigh voltage dip protection equipment of the present utility model is realized and being boosted by the Boost DC/DC converter of two-way crisscross parallel, can be used for medium-high voltage frequency converter, the not only current stress of cpable of lowering power pipe of the Boost topological structure of two-way crisscross parallel, be conducive to circuit and select little electric current, high performance power tube (type selecting of power tube is more extensive), also reduced the ripple of output total current simultaneously, extend the life-span of output capacitance, also improved the power grade of converter; Secondly, the utility model adopts digital control technology, can under direct current supply pattern, work, and the mesohigh direct current of stable output, for medium-high voltage frequency converter provides stable operating voltage, guarantees the safety and steady of system works; The utility model mesohigh voltage dip protection equipment can effectively ensure that frequency converter is normal, steady operation, and it is simple in structure, easy to operate.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model protection equipment;
Fig. 2 is the work schematic diagram of the utility model protection equipment;
Fig. 3 is the circuit diagram of the Boost DC/DC converter of two-way crisscross parallel in the utility model;
Fig. 4 is the main control process flow figure of single chip machine controlling circuit.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, the utility model is for the voltage dip protection equipment of mesohigh DC load, comprise Boost DC/DC converter, single chip machine controlling circuit and the output diode of two-way crisscross parallel, the output of single chip machine controlling circuit is connected with the Boost DC/DC converter of two-way crisscross parallel, the output of the Boost DC/DC converter of two-way crisscross parallel connects output diode, the utility model also comprises RS-485 communication interface and human-computer interaction interface, and human-computer interaction interface is connected with single chip machine controlling circuit by RS-485 interface; Wherein, single chip machine controlling circuit adopts single-chip microcomputer PIC16F72, and the power tube of the Boost DC/DC converter of two-way crisscross parallel is all selected the IGBT of Infineon module.The utility model also can carry out long-distance intelligent control to it by human-computer interaction interface and RS-485 communication interface.
As shown in Figure 2; the utility model mesohigh voltage dip protection equipment (HVSP) adopts DC power supply (batteries) power supply; batteries is as the input energy source of two-way crisscross parallel Boost converter in HVSP module; the size of HVSP input voltage is determined by the number of batteries of connecting; Boost DC/DC converter by two-way crisscross parallel boosts to battery voltage, and the Boost DC/DC converter of two-way crisscross parallel is connected with the DC bus end of frequency converter by output diode.
As shown in Figure 3, the Boost DC/DC converter using single chip machine controlling circuit of two-way crisscross parallel is as controller, two power tube Q1, the conducting duty ratio of Q2 is equal, and 1/2nd switch periods conductings of Q2 hysteresis Q1, compared with single Boost DC/DC, the current stress of the Boost topological structure cpable of lowering power pipe of crisscross parallel, be conducive to circuit and select little electric current, high performance power tube, also can improve the power grade of converter, reduce to export the ripple of total current; Wherein, U
infor input voltage, U
ofor output voltage, first via Boost DC/DC circuit is made up of L1, C1, C2, Q1, D1, and L1 is inductance, and C1, C2 are electric capacity, and power tube Q1 selects IGBT module, and diode D1 selects fast recovery diode; Be made up of L2, C3, C4, Q2, D2 with the second road Boost DC/DC circuit of first via Boost DC/DC circuit crisscross parallel, L2 is inductance, and C3, C4 are electric capacity, and power tube Q2 selects IGBT module, and diode D2 selects fast recovery diode.
As shown in Figure 4, under DC power supply pattern, conventionally require the input voltage of DC power supply will be lower than the output voltage of Boost DC/DC converter, by the single chip machine controlling circuit input voltage signal of sampling, then single-chip microcomputer provides the driving signal of crisscross parallel Boost inverter power pipe by sequential operation, the Boost converter of crisscross parallel (the wherein two power tube Q1 that start working, the conducting duty ratio of Q2 equates, / 2nd switch periods conductings of Q2 hysteresis Q1), realize boosting, it is output as stable mesohigh direct current.In the time that the AC-input voltage of frequency converter is normal, frequency converter busbar voltage is greater than the output voltage of HVSP, and output diode oppositely ends, and HVSP is in holding state; In the time there is shaking electricity in AC network, the DC bus-bar voltage of frequency converter will decline, now output diode forward conduction, therefore the mesohigh direct current of the Boost converter of crisscross parallel output will be delivered to the DC bus end of frequency converter, for it provides voltage support, ensured that frequency converter can not shut down because of the decline of alternating voltage, HVSP module has played the voltage support effect to frequency converter; Utilize current sensor to detect output current simultaneously, gathered electric current and delivered to single-chip microcomputer inside and process by single chip machine controlling circuit, HVSP equipment Inspection is to there being output current, and single-chip microcomputer starts to support timing; After ac grid voltage recovers normally, output diode oppositely ends, and output current is zero, and single-chip microcomputer stops timing, and HVSP exits support automatically, for occurring that electrical network shakes electric or has a power failure ready next time.
Mesohigh voltage dip protection equipment of the present utility model, in the time that electricity appears shaking in AC network, can be devoted oneself to work automatically, after power system restoration is normal, can automatically exit support, is inverter supply again by AC network.In addition, in required bearing power hour, can be worked alone by single protection equipment; In the time that required bearing power is larger, can adopt multiple protection equipment parallel operations, the output after now multiple protection equipment parallel connection connects the DC bus end of frequency converter, and there will not be circulation.
Above-mentioned execution mode is preferably execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other are any does not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (4)
1. the protection of the voltage dip for a mesohigh DC load equipment; it is characterized in that: the Boost DC/DC converter, single chip machine controlling circuit and the output diode that comprise two-way crisscross parallel; the output of described single chip machine controlling circuit is connected with the Boost DC/DC converter of described two-way crisscross parallel, and the output of the Boost DC/DC converter of described two-way crisscross parallel connects described output diode.
2. the protection of the voltage dip for mesohigh DC load equipment according to claim 1, is characterized in that: also comprise RS-485 communication interface and human-computer interaction interface; Described human-computer interaction interface is connected with described single chip machine controlling circuit by RS-485 interface.
3. the protection of the voltage dip for mesohigh DC load equipment according to claim 2, is characterized in that: described single chip machine controlling circuit adopts single-chip microcomputer PIC16F72.
4. the protection of the voltage dip for mesohigh DC load equipment according to claim 3, is characterized in that: the power tube of the Boost DC/DC converter of described two-way crisscross parallel is all selected the IGBT of Infineon module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420276631.1U CN203984236U (en) | 2014-05-28 | 2014-05-28 | A kind of protection of the voltage dip for mesohigh DC load equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420276631.1U CN203984236U (en) | 2014-05-28 | 2014-05-28 | A kind of protection of the voltage dip for mesohigh DC load equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203984236U true CN203984236U (en) | 2014-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420276631.1U Expired - Lifetime CN203984236U (en) | 2014-05-28 | 2014-05-28 | A kind of protection of the voltage dip for mesohigh DC load equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327023A (en) * | 2017-07-31 | 2019-02-12 | 许继集团有限公司 | A kind of DC/DC parallel running output adjusting method and its system |
| CN112019071A (en) * | 2015-07-29 | 2020-12-01 | 雅达电子国际有限公司 | Power converter |
-
2014
- 2014-05-28 CN CN201420276631.1U patent/CN203984236U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019071A (en) * | 2015-07-29 | 2020-12-01 | 雅达电子国际有限公司 | Power converter |
| CN109327023A (en) * | 2017-07-31 | 2019-02-12 | 许继集团有限公司 | A kind of DC/DC parallel running output adjusting method and its system |
| CN109327023B (en) * | 2017-07-31 | 2021-06-08 | 许继集团有限公司 | DC/DC parallel operation output adjusting method and system thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141203 |