CN103050946A - High-voltage frequency converter with over-current protection function and over-current protection method of frequency converter - Google Patents
High-voltage frequency converter with over-current protection function and over-current protection method of frequency converter Download PDFInfo
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- CN103050946A CN103050946A CN2013100204786A CN201310020478A CN103050946A CN 103050946 A CN103050946 A CN 103050946A CN 2013100204786 A CN2013100204786 A CN 2013100204786A CN 201310020478 A CN201310020478 A CN 201310020478A CN 103050946 A CN103050946 A CN 103050946A
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Abstract
The invention discloses a high-voltage frequency converter with an over-current protection function and an over-current protection method of the frequency converter. The high-voltage frequency converter comprises two current signal sampling modules, an analog/digital conversion module, a signal comparison module and a master control module, wherein the current signal sampling modules are respectively arranged at any two phase windings of the high-voltage frequency converter and are used for acquiring and outputting phase current signals; the analog/digital conversion module receives the current signals and converts the current signals to digital signals for output; the signal comparison module receives the digital signals, compares the digital signals with a reference current signal, and outputs an over-current signal; and the master control module receives the over-current signal, and controls power output of the high-voltage frequency converter. According to the invention, the current signal sampling module can automatically detect an over-current fault of the frequency converter, and when the over-current fault occurs, the master control module interrupts the power output of the frequency converter, and an alarm signal is emitted simultaneously, so that the high-voltage frequency converter and external devices are automatically protected, and production accidents are avoided.
Description
Technical field
The present invention relates to a kind of high voltage converter, be specifically related to a kind of high voltage converter and overcurrent protection method thereof with excess current protective function.
Background technology
Realize that by the mode that changes ac frequency the technology of alternating current control just is converter technique, its core is frequency converter, it realizes the automatic adjusting of motor operation speed by the conversion to frequency of supply, the fixedly mains frequency of 50Hz is changed into the frequency of variation.Simultaneously, also make supply voltage adjust to certain accommodation.
High voltage converter can realize that because it has stepless time adjustment, change conventional motors are intelligent electric machine, significant energy-saving benefit, starting current can be controlled at rated current with interior, non-impact current, impact little to electrical network, reduce the advantages such as mechanical wear, saving maintenance cost, be widely used in the industries such as metallurgy, petrochemical industry, electric power, mining, urban construction and transportation industries.
High voltage converter comprises transformer case, power cabinet and the control cubicle of successively adjacent setting, and described transformer case is mainly high pressure isolation phase shifting transformer, perfect grid side voltage, the current harmonics eliminated; Power cabinet is the core of transducer power main circuit, is comprised of a plurality of identical power cells, forms the three-phase voltage that outputs to motor after the output voltage overlapped in series of each power cell; Control cubicle is the core of whole high-voltage variable-frequency and variable-speed system, it is according to operation and the setting of user at Local or Remote, and voltage, current analog amount and each switching value in the acquisition system, after carrying out logical process and calculating, determine and control the action of each power cell, further drive motors satisfies the output requirement.
In the high voltage converter running, often can because of input voltage is unusual, load is undergone mutation or unusually, transducer power is less than normal etc., and the frequency converter overcurrent fault appears in reason.When overcurrent fault appears in high voltage converter, if can not find the very first time and process, will damage frequency converter and external equipment, the production development accident.For protection high voltage converter and external equipment, avoid the generation of production accident, a kind of high voltage converter with excess current protective function need be provided.
Summary of the invention
The object of the invention provides a kind of high voltage converter and overcurrent protection method thereof with excess current protective function; automatically detect the frequency converter overcurrent fault, interrupt the output of frequency converter, send simultaneously alarm signal; automatically protection frequency converter and external equipment are avoided the generation of production accident.
For achieving the above object, the technical solution used in the present invention is: a kind of high voltage converter with excess current protective function comprises:
Be located at respectively two current signal sampling modules of wantonly two phase winding places, collection and the output current phase signal of described high voltage converter;
Receive described current signal and convert described current signal to the mould of digital signal output/number conversion module;
Receive described digital signal, and this digital signal and reference current signal are compared, exported the signal fusing module of overcurrent signal;
Receive the main control module of described overcurrent signal, the described high voltage frequency converter power output of control;
Two described current signal sampling modules are connected with mould/number conversion module respectively, and described mould/number conversion module, signal fusing module and main control module are electrically connected successively.
In the technique scheme, described high voltage converter comprises transformer case and power cabinet, be provided with high pressure isolation phase shifting transformer in the described transformer case, be provided with in the described power cabinet a plurality of, by the power cell of described high pressure isolation phase shifting transformer secondary side power supply, the secondary side of described high pressure isolation phase shifting transformer and the input side of described power cell all are equipped with fuse.
Preferably, described current signal sampling module is the current Hall transducer.
In the technique scheme, this high voltage converter also comprises control cubicle, and described control cubicle is provided with LCDs, and the function code of described overcurrent signal and content are shown on this LCDs.
In the technique scheme, this high voltage converter also comprises the warning device of the alarm signal of sending with main control module electrical connection, the described main control module of reception.
The present invention also provides a kind of overcurrent protection method of high voltage converter, comprises the steps:
(1) utilize the current signal sampling module respectively the phase current signal of wantonly two phase windings of high voltage converter to be sampled;
(2) utilize mould/number conversion module respectively the biphase current signal that collects in the step (1) to be carried out mould/number conversion;
(3) utilize the signal fusing module that the digital signal and the reference current signal that obtain in the step (2) are compared, when described digital signal greater than the reference current signal time output overcurrent signal;
(4) overcurrent signal of the main control module receiving step (3) of high voltage converter, the power stage of interruption high voltage converter, high voltage converter quits work;
(5) alarm module receives the alarm signal that main control module sends, caution staff high voltage converter generation overcurrent fault.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. the present invention is provided with the current signal sampling module that can automatically detect the frequency converter overcurrent fault; and when occuring, overcurrent fault utilize main control module to interrupt the power stage of frequency converter; send simultaneously alarm signal; automatically protection high voltage converter and external equipment are avoided the generation of production accident.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one;
Fig. 2 is the operation principle block diagram of embodiment one;
Wherein: 1, power cabinet; 2, transformer case; 3, control cubicle; 30, LCDs.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Embodiment one: shown in Figure 1; a kind of high voltage converter with over-voltage protection function; its line voltage is 6kV; adopt the IGBT of 1700V; comprise power cabinet 1, transformer case 2 and control cubicle 3; be provided with high pressure isolation phase shifting transformer in the described transformer case 2, be provided with 15 in the described power cabinet, by the power cell of described high pressure isolation phase shifting transformer secondary side power supply, wherein whenever comprise mutually 5 power cells.The secondary side of described high pressure isolation phase shifting transformer and the input side of described power cell all are equipped with fuse.
Described control cubicle 3 is provided with LCDs 30, and the function code of described overcurrent signal and content are shown on this LCDs 30.
Described high voltage converter also comprises:
Be located at respectively two current signal sampling modules of wantonly two phase winding places, collection and the output current phase signal of described high voltage converter, preferred, described current signal sampling module is the current Hall transducer;
Receive described current signal and convert described current signal to the mould of digital signal output/number conversion module;
Receive described digital signal, and this digital signal and reference current signal are compared, exported the signal fusing module of overcurrent signal;
Receive the main control module of described overcurrent signal, the described high voltage frequency converter power output of control;
The warning device of the alarm signal of be electrically connected with main control module, the described main control module of reception sending;
Two described current signal sampling modules are connected with mould/number conversion module respectively, and described mould/number conversion module, signal fusing module and main control module are electrically connected successively.
Be illustrated in figure 2 as the overcurrent protection schematic diagram of present embodiment, it comprises the steps:
(1) utilize the current signal sampling module respectively the phase current signal of wantonly two phase windings of high voltage converter to be sampled;
(2) utilize mould/number conversion module respectively the biphase current signal that collects in the step (1) to be carried out mould/number conversion;
(3) utilize the signal fusing module that the digital signal and the reference current signal that obtain in the step (2) are compared, when described digital signal greater than the reference current signal time output overcurrent signal;
(4) overcurrent signal of the main control module receiving step (3) of high voltage converter, the power stage of interruption high voltage converter, high voltage converter quits work;
(5) alarm module receives the alarm signal that main control module sends, caution staff high voltage converter generation overcurrent fault.
Because the present invention is provided with the current signal sampling module that can automatically detect the frequency converter overcurrent fault; and when occuring, overcurrent fault utilize main control module to interrupt the power stage of frequency converter; send simultaneously alarm signal; automatically protection high voltage converter and external equipment are avoided the generation of production accident.
The above is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the high voltage converter with excess current protective function is characterized in that, comprising:
Be located at respectively two current signal sampling modules of wantonly two phase winding places, collection and the output current phase signal of described high voltage converter;
Receive described current signal and convert described current signal to the mould of digital signal output/number conversion module;
Receive described digital signal, and this digital signal and reference current signal are compared, exported the signal fusing module of overcurrent signal;
Receive the main control module of described overcurrent signal, the described high voltage frequency converter power output of control;
Two described current signal sampling modules are connected with mould/number conversion module respectively, and described mould/number conversion module, signal fusing module and main control module are electrically connected successively.
2. the high voltage converter with excess current protective function according to claim 1; it is characterized in that; described high voltage converter comprises transformer case and power cabinet; be provided with high pressure isolation phase shifting transformer in the described transformer case; be provided with in the described power cabinet a plurality of, by the power cell of described high pressure isolation phase shifting transformer secondary side power supply, the secondary side of described high pressure isolation phase shifting transformer and the input side of described power cell all are equipped with fuse.
3. the high voltage converter with excess current protective function according to claim 1 is characterized in that, described current signal sampling module is the current Hall transducer.
4. the high voltage converter with excess current protective function according to claim 1; it is characterized in that; this high voltage converter also comprises control cubicle, and described control cubicle is provided with LCDs, and the function code of described overcurrent signal and content are shown on this LCDs.
5. the high voltage converter with excess current protective function according to claim 1 is characterized in that, this high voltage converter also comprises the warning device of the alarm signal of sending with main control module electrical connection, the described main control module of reception.
6. the overcurrent protection method of a high voltage converter claimed in claim 1 is characterized in that, comprises the steps:
(1) utilize the current signal sampling module respectively the phase current signal of wantonly two phase windings of high voltage converter to be sampled;
(2) utilize mould/number conversion module respectively the biphase current signal that collects in the step (1) to be carried out mould/number conversion;
(3) utilize the signal fusing module that the digital signal and the reference current signal that obtain in the step (2) are compared, when described digital signal greater than the reference current signal time output overcurrent signal;
(4) overcurrent signal of the main control module receiving step (3) of high voltage converter, the power stage of interruption high voltage converter, high voltage converter quits work;
(5) alarm module receives the alarm signal that main control module sends, caution staff high voltage converter generation overcurrent fault.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100204786A CN103050946A (en) | 2013-01-21 | 2013-01-21 | High-voltage frequency converter with over-current protection function and over-current protection method of frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100204786A CN103050946A (en) | 2013-01-21 | 2013-01-21 | High-voltage frequency converter with over-current protection function and over-current protection method of frequency converter |
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| CN103050946A true CN103050946A (en) | 2013-04-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490675A (en) * | 2018-12-27 | 2019-03-19 | 上海辛格林纳新时达电机有限公司 | Method for early warning, electronic equipment and test macro |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007166815A (en) * | 2005-12-15 | 2007-06-28 | Toshiba Mitsubishi-Electric Industrial System Corp | Inverter device and method of protecting overvoltage thereof |
| CN201656443U (en) * | 2010-03-29 | 2010-11-24 | 卧龙电气集团股份有限公司 | Vibrating motor set frequency control lack-phase overload protection device |
| CN202085077U (en) * | 2011-05-26 | 2011-12-21 | 江苏力普电子科技有限公司 | High-voltage frequency converter |
| CN203166480U (en) * | 2013-01-21 | 2013-08-28 | 江苏力普电子科技有限公司 | High-voltage frequency converter having over-current protection function |
-
2013
- 2013-01-21 CN CN2013100204786A patent/CN103050946A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166815A (en) * | 2005-12-15 | 2007-06-28 | Toshiba Mitsubishi-Electric Industrial System Corp | Inverter device and method of protecting overvoltage thereof |
| CN201656443U (en) * | 2010-03-29 | 2010-11-24 | 卧龙电气集团股份有限公司 | Vibrating motor set frequency control lack-phase overload protection device |
| CN202085077U (en) * | 2011-05-26 | 2011-12-21 | 江苏力普电子科技有限公司 | High-voltage frequency converter |
| CN203166480U (en) * | 2013-01-21 | 2013-08-28 | 江苏力普电子科技有限公司 | High-voltage frequency converter having over-current protection function |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490675A (en) * | 2018-12-27 | 2019-03-19 | 上海辛格林纳新时达电机有限公司 | Method for early warning, electronic equipment and test macro |
| CN109490675B (en) * | 2018-12-27 | 2022-06-28 | 上海辛格林纳新时达电机有限公司 | Early warning method, electronic device and test system |
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Application publication date: 20130417 |