CN202696460U - Voltage temporary sag protection device used for direct current load - Google Patents
Voltage temporary sag protection device used for direct current load Download PDFInfo
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- CN202696460U CN202696460U CN 201220379845 CN201220379845U CN202696460U CN 202696460 U CN202696460 U CN 202696460U CN 201220379845 CN201220379845 CN 201220379845 CN 201220379845 U CN201220379845 U CN 201220379845U CN 202696460 U CN202696460 U CN 202696460U
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- frequency converter
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Abstract
The utility model discloses a voltage temporary sag protection device used for a direct current load. An output terminal of the protection device is connected with a direct current bus terminal of a frequency converter. The voltage temporary sag protection device used for the direct current load comprises a Boost DC/DC converter, a single chip microcomputer control circuit, a direct current differential voltage control electronic switch and an output thyristor. An output terminal of the single chip microcomputer control circuit is connected with the Boost DC/DC converter. The Boost DC/DC converter is connected with the direct current bus terminal of the frequency converter sequentially through a digital differential voltage control switching module and the output thyristor. The voltage temporary sag protection device can effectively guarantee the normal and stable operation of the frequency converter, has a simple structure, and is convenient to operate.
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 voltage dip protection equipment of anti-shake electricity.
Background technology
At present, it is poor that the greatest problem that the frequency converter control system of most industry spot faces is exactly anti-shake power, main manifestations in the following areas: 1) the anti-shake power of control circuit is poor, when the rolling electricity appears in industry spot, the control circuit dead electricity, frequency converter will be protected.2) the anti-shake power of frequency converter itself is poor, and when industry spot alternating voltage moment was fallen, frequency converter can under-voltage protection, and when voltage recovered, frequency converter can restart.This is the inherent characteristic of frequency converter itself, and all there is this problem in frequency converter basically.
Summary of the invention
The purpose of this utility model is the defective that exists in the prior art in order to solve, and a kind of protection equipment of anti-shake electricity is provided.
In order to achieve the above object, the utility model provides a kind of voltage dip protection equipment for DC load, and the output of this protection equipment links to each other with the dc bus end of frequency converter; Protection equipment comprises Boost DC/DC converter, single chip machine controlling circuit, electronic switch for controlling direct-current pressure difference and output thyristor; The output of single chip machine controlling circuit links to each other with Boost DC/DC converter; Boost DC/DC converter links to each other with the dc bus end of frequency converter with the output thyristor by electronic switch for controlling direct-current pressure difference successively.
Further improvement of the utility model is: above-mentioned protection equipment also comprises RS-485 communication interface and human-computer interaction interface; Human-computer interaction interface links to each other with single chip machine controlling circuit by the RS-485 interface.Protection equipment is a plurality of, and rear output in parallel links to each other with the dc bus end of frequency converter.Single chip machine controlling circuit adopts single-chip microcomputer PIC16F72.The power tube of Boost DC/DC converter is selected the IGBT of Infineon module.
Voltage dip protection equipment has the following advantages compared to existing technology: the utility model is realized boosting by Boost DC/DC converter; adopt digital control technology; can under two kinds of powering modes of AC and DC, work; the high voltage direct current of stable output; for frequency converter provides stable operating voltage, guarantee the system safety smooth working.When AC network the rolling electricity occurs or has a power failure, can automatically devote oneself to work simultaneously, after power system restoration is normal, can automatically withdraw from support, be inverter supply by electrical network.In bearing power hour, can be worked alone by single protection equipment; When bearing power is larger, can adopts a plurality of protection equipment parallel operations, and circulation can not occur.And can carry out long-distance intelligent control by human-computer interaction interface and RS-485 communication interface.This real invention voltage dip protection equipment can guarantee effectively that frequency converter is normal, steady operation, and is simple in structure, easy to operate.
Description of drawings
Fig. 1 is the structural representation of the utility model voltage dip protection equipment;
Fig. 2 is the circuit diagram of Boost DC/DC converter among Fig. 1;
Fig. 3 is single-chip microcomputer main control process flow figure;
Embodiment
Below in conjunction with accompanying drawing the voltage dip protection equipment that the utility model is used for DC load is elaborated.
Referring to Fig. 1, the input energy source of the utility model voltage dip protection equipment (VSP) can be divided into: two kinds of three-phase alternating current (380V) and DC power supply (batteries), output links to each other with the dc bus end of frequency converter.When adopting the three-phase alternating current input as energy source, the VSP module can be fallen temporarily voltage transformation with the interchange of the different brackets of input and be become stable high voltage direct current, offers frequency converter.This protection equipment comprises Boost DC/DC converter, single chip machine controlling circuit, electronic switch for controlling direct-current pressure difference, output thyristor, RS-485 communication interface and human-computer interaction interface.Single chip machine controlling circuit adopts single-chip microcomputer PIC16F72.Adopt digital control technology, realize the work of Boost DC/DC converter is set by single chip machine controlling circuit, the support works time of VSP can be set according to different conditions of work.Boost DC/DC converter passes through successively electronic switch for controlling direct-current pressure difference (analog circuit) and exports the stable high voltage direct current of SCR-output to frequency converter.Human-computer interaction interface links to each other with single chip machine controlling circuit by the RS-485 interface, realizes the long-distance intelligent regulation and control.
In conjunction with Fig. 2, Boost DC/DC converter using single chip machine controlling circuit is as controller, U
InBe input voltage, U
oBe output voltage, L
1Be inductance, C
1, C
2Be electric capacity, power tube Q1 selects the IGBT module; Diode D1 selects fast recovery diode.In conjunction with the main control process flow figure of Fig. 3 system, as can be known:
1) if when VSP adopts the three-phase alternating current power supply, single chip machine controlling circuit comes Gather and input voltage by the AD unit of self, when alternating voltage is normal, single chip machine controlling circuit is forbidden the driving signal (pwm signal) of power output pipe, this moment, the VSP module was not worked, the power tube that is Boost DC/DC converter is in cut-off state, not conducting of electronic switch for controlling direct-current pressure difference, the output thyristor just can conducting, the dc bus that is equivalent to the output of VSP module and frequency converter disconnects, and this moment frequency converter by three-phase alternating current electrical network normal power supply;
When the rolling electricity appears in AC network; alternating voltage can descend; single chip machine controlling circuit obtains voltage signal by voltage sensor; utilize the AD unit of single-chip microcomputer to gather voltage signal; then the single-chip microcomputer in the VSP module begins executive program; the logic of being correlated with and data operation; exported the driving signal of the power tube of Boost converter by single chip machine controlling circuit; the Boost converter is started working; the high voltage direct current of stable output; and this moment is because alternating voltage decline; the DC bus-bar voltage of frequency converter will descend thereupon; electronic switch for controlling direct-current pressure difference will conducting, can trigger the conducting of output thyristor, so the high voltage direct current of Boost converter output will be delivered to the dc bus end of frequency converter; for it provides voltage support; guaranteed that frequency converter can not shut down because of the decline of alternating voltage, the VSP module played when alternating voltage falls temporarily to frequency converter supporting role, this moment, single-chip microcomputer began timing.
After ac grid voltage recovers normally, single chip machine controlling circuit sampling input voltage, carry out related data and logical operation, the driving inhibit signal of the power tube of single chip machine controlling circuit output Boost converter, the Boost converter quits work, it is normal that the DC bus-bar voltage of frequency converter is recovered, the DC differential pressure electronic switch disconnects, the cut-off of output thyristor, VSP withdraws from support automatically, and timing finishes, supporting time is greater than the rolling electricity time, VSP is in holding state, and ready for next time occurring electrical network rolling electricity, frequency converter reverts to three-phase alternating-current powered.
2) if when adopting DC power supply (batteries) power supply, batteries is as the input energy source of Boost converter in the VSP module, and the size of the input voltage of VSP is determined by the number of batteries of series connection.Under the DC power supply pattern, usually 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 the power tube of Boost converter by sequential operation, the Boost converter is started working, realize boosting, it is output as stable high voltage direct current.When the AC-input voltage of frequency converter was normal, electronic switch for controlling direct-current pressure difference was failure to actuate, the cut-off of output thyristor, and VSP is in holding state.
When AC network rolling electricity or short time occur when having a power failure, the DC bus-bar voltage of frequency converter will descend, this moment, electronic switch for controlling direct-current pressure difference was open-minded, trigger the conducting of output thyristor, therefore the high voltage direct current of Boost converter output will be delivered to the dc bus end of frequency converter, for it provides voltage support, guaranteed that frequency converter can not shut down because of the decline of alternating voltage, the VSP module played to frequency converter supporting role; Utilize simultaneously current sensor to detect output current, gather electric current by single chip machine controlling circuit and deliver to single-chip microcomputer inside and process, the VSP equipment Inspection is to there being output current, and single-chip microcomputer begins to support timing.
After ac grid voltage recovers normally, electronic switch for controlling direct-current pressure difference disconnects, the cut-off of output thyristor, output current is zero, single-chip microcomputer stops timing, and VSP withdraws from support automatically, and supporting time is greater than the rolling electricity time, VSP is in stand-by operation, for next time occurring electrical network rolling electricity or having a power failure ready.
Claims (5)
1. the voltage dip with DC load is protected equipment, and it is characterized in that: the output of described protection equipment links to each other with the dc bus end of described frequency converter; Described protection equipment comprises Boost DC/DC converter, single chip machine controlling circuit, electronic switch for controlling direct-current pressure difference and output thyristor; The output of described single chip machine controlling circuit links to each other with described Boost DC/DC converter; Described Boost DC/DC converter links to each other with the dc bus end of frequency converter with the output thyristor by electronic switch for controlling direct-current pressure difference successively.
2. voltage dip according to claim 1 is protected equipment, and it is characterized in that: described protection equipment also comprises RS-485 communication interface and human-computer interaction interface; Described human-computer interaction interface links to each other with described single chip machine controlling circuit by the RS-485 interface.
3. voltage dip according to claim 1 and 2 is protected equipment, and it is characterized in that: described protection equipment is a plurality of, and rear output in parallel links to each other with the dc bus end of described frequency converter.
4. voltage dip protection equipment according to claim 1 and 2 is characterized in that: described single chip machine controlling circuit employing single-chip microcomputer PIC16F72.
5. voltage dip according to claim 1 and 2 is protected equipment, and it is characterized in that: the power tube of described Boost DC/DC converter is selected the IGBT of Infineon module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220379845 CN202696460U (en) | 2012-08-02 | 2012-08-02 | Voltage temporary sag protection device used for direct current load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220379845 CN202696460U (en) | 2012-08-02 | 2012-08-02 | Voltage temporary sag protection device used for direct current load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696460U true CN202696460U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220379845 Expired - Lifetime CN202696460U (en) | 2012-08-02 | 2012-08-02 | Voltage temporary sag protection device used for direct current load |
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| Country | Link |
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| CN (1) | CN202696460U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006884A (en) * | 2014-12-25 | 2015-10-28 | 南京国臣信息自动化技术有限公司 | Intrinsically-safe direct current system |
-
2012
- 2012-08-02 CN CN 201220379845 patent/CN202696460U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006884A (en) * | 2014-12-25 | 2015-10-28 | 南京国臣信息自动化技术有限公司 | Intrinsically-safe direct current system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171109 Address after: No. 9 Fuying road Jiangning District of Nanjing city in Jiangsu province 211100 No. 1001 East U Valley Nanjing international port Patentee after: NANJING GUOCHEN DIRECT CURRENT DISTRIBUTION TECHNOLOGY CO.,LTD. Address before: Yudaojie Baixia District of Nanjing City, Jiangsu province 210002 No. 33 Taisho investment building four floor B block Patentee before: GOLDEN COOPERATE INFORMATION & AUTOMATION TECHNOLOGY (NANJING) CO.,LTD. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130123 |