CN201063543Y - Full frequency AC-AC frequency converter - Google Patents
Full frequency AC-AC frequency converter Download PDFInfo
- Publication number
- CN201063543Y CN201063543Y CNU2007200848764U CN200720084876U CN201063543Y CN 201063543 Y CN201063543 Y CN 201063543Y CN U2007200848764 U CNU2007200848764 U CN U2007200848764U CN 200720084876 U CN200720084876 U CN 200720084876U CN 201063543 Y CN201063543 Y CN 201063543Y
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Abstract
The utility model discloses a full-frequency cycloconverter and is characterized in that: the cycloconverter consists of a frequency conversion controller and a main circuit, the main circuit is formed by elements such as a full-control insulation gate bipolar transistor IGBT element, a contactor, a quick fuse, a current mutual inductor, a current/voltage meter, a heat relay and a filtering reactor and so on. Compared with all kinds of frequency converters, the utility model has lower switch frequency, so the switch has smaller loss and low temperature rise, which contributes to the safe and reliable work of the elements of the main circuit. The utility model is expected to be widely used in AC transmission in shorter time, and to play an important role in energy conservation, energy consumption decrease, production and labor efficiency improvement and so on.
Description
Technical field
The utility model relates to the motor frequency converter.
Background technology
Since the eighties in 20th century, ac speed control technology and application development thereof are very fast, and alternating current motor is simpler, cheap, easy to maintenance than dc motor structure.Alternating Current Governor System is in energy-conservation speed governing such as blower fan, water pumps; High dynamic performance speed governing such as rolling mill, lathe, electric locomotive; The synchronous variable-speed of petrochemical industry, weaving, light industry and machinery etc.; The high speed bistrique, high rotating speed speed governing such as centrifuge; The speed governing of high-capacity such as mine hoisting winch, heavy plate mill.Aspects has obtained application more and more widely.
The frequency converter of producing is to hand over the orthogonal voltage frequency converter basically at present, this type of frequency converter price comparison is expensive, technical in addition existence two big problems, the one, rectifying and wave-filtering link in the middle of existing, so efficient is lower, the 2nd, when being in the generating state energy, motor returns the electrical network difficulty, normally connecting resistance loop falls energy consumption, increase the volume of equipment so on the one hand, energy does not obtain utilizing on the other hand, is great waste, can obtain utilizing in order to make energy, can increase active-inverter, but this increases the complexity of cost and circuit again.
Its operation principle of AC-AC frequency converter is that three phase worker power is directly produced required variable voltage variable frequency power supply through several groups of phased switch controls at present, its advantage is the efficient height, energy can conveniently return electrical network, the highest frequency of its maximum shortcoming output must be less than input supply frequency 1/3 or 1/2, otherwise output waveform is too poor, motor produces shake, can not work.Old friend's ac frequency converter limits to slow-speed of revolution speed governing occasion so far, thereby has limited its scope of application greatly.
Summary of the invention
The purpose of this utility model provides a kind of full rate AC-AC frequency converter of simple in structure, dependable performance.
The purpose of this utility model realizes by following technical scheme,
The utility model full rate AC-AC frequency converter is made up of frequency-variable controller and main circuit two parts.Main circuit is made up of elements such as full control insulated door polar form bipolar transistor IGBT element, contactor, fast acting fuse, current transformer, current voltmeter, thermal relay, filter reactors.
The joint of the two-way full control 1#...9# element GS1...GS9 of the joint of frequency-variable controller output signal VGS1...VGS9 and main circuit links, over-current detection LH1, LH2 and main circuit instrument transformer LH1, LH2 links, J2 overcurrent normally closed contact and main circuit control circuit J2 links, three-phase A, B, c-power supply and main circuit contact device C link.Every group of full control elements 1 piezo-resistance YR in parallel is with doing the element overvoltage protection.Full control elements adopts forced air cooling.
The utility model also can be provided with the brake application stoping controller.
When the utility model uses, when pressing starting button QA, contactor C adhesive, full control elements input and frequency-variable controller get.Setpoint frequency and raising speed time, press play button, frequency-variable controller is started working, output control signal VGS carries out in real time suitably control to two-way full control 1#...9# element, can obtain the alternating voltage of frequency and all regulatable three-phase mutual deviation 120 of voltage at load end, motor stops raising speed by setting the speed starting when being raised to setpoint frequency.If will change rotating speed, as long as change setpoint frequency.The full rate AC-AC frequency converter output frequency upper limit can reach more than the supply frequency, if supply frequency is 50HZ, then output frequency can surpass 50HZ.
When main circuit generation overcurrent, detect by LH1, LH2, make frequency-variable controller not have the output of control control VGS signal immediately, two-way full control elements quits work, and the J2 normally closed contact disconnects simultaneously, and the C power failure tripping is protected two-way full control elements and motor.
Frequency-variable controller is provided with and rises or the anti-tripping operation of reduction of speed defencive function, and too fast when liter (falling) speed, occurring failing to be convened for lack of a quorum stops liter (a falling) speed immediately, treats that electric current drops to permissible value and begins liter (a falling) speed again.
Frequency-variable controller also is provided with the automatic enhanced feature of low speed voltage, and booster tension is with compensation stator magneto resistance pressure drop affects automatically according to the load current size, and it is constant substantially to keep the motor windings magnetic flux, realizes the following speed regulation by constant torque of rated speed.
The utility model adopts new frequency conversion principle, through several switching and correspondent control circuits output frequency is brought up to more than the input supply frequency three phase worker power to full control electronic switch, to realize the following speed regulation by constant torque of rated speed, the above constant-power speed regulation of rated speed, AC-AC frequency converter is obtained and the same scope of application of ac-dc-ac inverter device, its method is simple in structure, and volume is little, relatively has bigger advantage with present frequency converter.
The utility model adopts 18 full control switch elements to carry out in real time suitably control, the present AC-AC frequency converter output frequency upper limit is brought up to more than the supply frequency by the 1/3-1/2 supply frequency, thereby expanded its scope of application greatly, realizes the full rate frequency control.The utility model only uses the one-level conversion with regard to the Direct Conversion transformation, no intermediate dc link, and energy conversion efficiency height not only, and saved the required wattless component of intermediate dc link.Ac-dc-ac inverter output transform secondary, and have wattless component, conversion efficiency is low.
The utility model can make power carry to either direction between power supply and load, realizes the four quadrant running of alternating current motor, and the ac-dc-ac inverter device, energy just is difficult to return AC network during the alternating current motor braking, is difficult to four quadrant running.
The utility model is compared with all kinds of frequency converters, and switching frequency is lower, thereby switching loss is smaller, and temperature rise is low, helps the safe and reliable work of main circuit component.Be expected in the short period of time, be widely used in the interchange transmission, play a significant role at aspects such as energy savings, reduction consumption, raising productive labor efficient.
Description of drawings
Accompanying drawing 1 is the utility model circuit diagram
Specific embodiment
The utility model full rate AC-AC frequency converter embodiment is made up of frequency-variable controller 1 and main circuit two parts as shown in drawings.Main circuit is made up of elements such as 18 full control insulated door polar form bipolar transistor IGBT elements, contactor, fast acting fuse, current transformer, current voltmeter, thermal relay, filter reactors.
Frequency-variable controller is provided with frequency display unit and frequency setting and raising speed and sets button, after linking, the joint of the two-way full control 1#...9# element GS1...GS9 of the joint of output signal VGS1...VGS9 on the frequency-variable controller and main circuit meets the over-current detection end LH1 on asynchronous machine 4, the frequency-variable controller, LH2 and main circuit instrument transformer LH1, LH2 links, overcurrent normally closed contact J2 and main circuit control circuit J2 links, three-phase A, B, c-power supply and main circuit contact device C link.Also be provided with three-phase switching device shifter 3 on the main circuit.Every group of full control elements IGBT 1 piezo-resistance YR in parallel is with doing the element overvoltage protection.Full control elements adopts forced air cooling.
Claims (2)
1. full rate AC-AC frequency converter, it is characterized in that: form by frequency-variable controller and main circuit two parts, main circuit is formed frequency-variable controller output signal V by elements such as full control insulated door polar form bipolar transistor IGBT element, contactor, fast acting fuse, current transformer, current voltmeter, thermal relay, filter reactors
GA1... V
GS9Joint and the joint of the two-way full control 1#...9# of main circuit element GS1...GS9 link, the instrument transformer LH1 of frequency-variable controller, LH2 and main circuit instrument transformer LH1, LH2 links, the overcurrent normally closed contact J2 of frequency-variable controller and main circuit control circuit J2 links, three-phase A, B, c-power supply and main circuit contact device C link; Every group of full control elements 1 piezo-resistance YR in parallel is with doing the element overvoltage protection.
2. full rate AC-AC frequency converter as claimed in claim 1 is characterized in that: main circuit has used 18 full control insulated door polar form bipolar transistor IGBT elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200848764U CN201063543Y (en) | 2007-05-21 | 2007-05-21 | Full frequency AC-AC frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200848764U CN201063543Y (en) | 2007-05-21 | 2007-05-21 | Full frequency AC-AC frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201063543Y true CN201063543Y (en) | 2008-05-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200848764U Expired - Fee Related CN201063543Y (en) | 2007-05-21 | 2007-05-21 | Full frequency AC-AC frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201063543Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565447A (en) * | 2011-12-29 | 2012-07-11 | 雷奇节能科技股份有限公司 | Method for searching motor rotor frequency in process of starting flying car with high voltage inverter |
-
2007
- 2007-05-21 CN CNU2007200848764U patent/CN201063543Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565447A (en) * | 2011-12-29 | 2012-07-11 | 雷奇节能科技股份有限公司 | Method for searching motor rotor frequency in process of starting flying car with high voltage inverter |
| CN102565447B (en) * | 2011-12-29 | 2014-06-04 | 雷奇节能科技股份有限公司 | Method for searching motor rotor frequency in process of starting flying car with high voltage inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080521 |