Common general purpose inverter drive circuit form and analysis - HC net electrical industry

Mainly through General Inverter driving circuit analysis, to understand some of the common forms and driver circuit trends to meet the needs of practical problems to solve on-site.

  1 Introduction AC Variable Speed is an important development of modern electric drive technology direction, with the power electronics technology, microelectronic technology and modern control theory in the application of AC drive system, variable frequency AC speed has been gradually replaced Over the past slip speed, variable speed pole, DC Speed Control System, etc., more and more widely used in industrial production and daily life in many areas.

With the extensive application of frequency converter, and many engineers have a considerable understanding of it is also generally less common inverter Package Includes the following sections: 1 circuit, 2 DC intermediate circuit, inverter circuit 3, 4 control circuit. Resulting adjustable voltage and adjustable frequency inverter circuit, it should be the core components of inverter technology.

2 Driver Inverter circuit includes: inverter module and drive circuit. Due to processing, packaging technology, high-power transistor components such factor effects, mainly from Japan inverter module ( Toshiba , Mitsubishi The three societies, Fuji, 3 Ken) and Europe ( Siemens , Simon Kang, Motorola , IR) and a few other manufacturers can produce.

Inverter circuit drive circuit as part of the three-phase output of the inverter has a huge impact. Driving circuit design of such general ways (1) composed of discrete components of pin drive circuit; (2) optocoupler drive circuit; (3) thick film drive circuit; (4) Several specific block and drive circuits.

(1) discrete component driver circuit of pin Composed of discrete components of pin driver circuit in the 80's in Japan and Taiwan inverter is widely used, including Japan (Fuji: G2, G5, 3 Ken: SVS, SVF, MF, Spring, Mitsubishi Z Series K Series, etc.) Taiwan (Olin, general biography, Taian) series inverter. With the large-scale IC SMD technology development and the emergence of such complex circuit design, integrated low-level driver circuit is gradually phased out.

(2) optocoupler drive circuit Optocoupler drive circuit design in modern inverter is widely used a driver circuit, due to simple circuit, high reliability, switching performance, is more than Europe and Japan inverter manufacturers to use. As the drive optocoupler models, so it is also a great selection of room. Driven primarily by greater use optocoupler Toshiba TLP series, Sharp PC Series, Hewlett-Packard The HCPL series. Toshiba TLP series coupler as an example. Drive IGBT modules are used mainly TLP250, TLP251 optocoupler drive the two models. For low current (15A) about the general use of the module TLP251. Then his assistant, to drive external power supply and current limiting resistor, etc. constitute the most simple drive circuit. For medium current (50A) about the general use of the module optocoupler TLP250 models. As for the larger currents of modules in the design of driving circuit generally taken in the back to add an optocoupler driver amplifier to achieve the purpose of safe driving IGBT modules.

(3) thick film drive circuit Thick film drive circuit components and in the RC Semiconductor Technology developed on the basis of a hybrid integrated circuit. It is the use of thick Membrane Technology In Ceramics Substrate Make Model components and wiring, will drive the various components integrated circuit on a ceramic substrate, making it a whole part. Use the driver for the design of thick-film Wiring Is a big convenience, improve machine reliability and consistency of mass production, but also to strengthen the confidentiality of the technology. Are often integrated drive a lot of thick film circuit protection, detection circuit. Should be said that the technical content of thick film driven more and more.

(4) Special Manifold Driver There is also a dedicated block and driver circuits, mainly by IR's IR2111, IR2112, IR2113, etc., other are Mitsubishi EXB Series driver thick. Mitsubishi M57956, M57959 and other drive thick.

In addition, some European and American frequency converter is designed using high-frequency isolation Transformer Joined the drive circuit (such as the Danfoss VLT frequency converter series). It should be said by a number of high-frequency power transformer on the drive circuit and signal isolation, and enhance the reliability of the drive circuit, but also effectively prevent some of the strong electric circuit failure of the weak current circuit damage. In the actual maintenance, we also feel that this drive circuit failure rate is very low, very few problems with power modules.

In our usual daily production use, the power module damage is a common fault phenomena. 3 Fault Phenomenon Damage may be due to many and varied. Motor short circuit, poor insulation on the ground, Motor Blocking switch, external power supply voltage high power inverter module are likely to cause damage, we replace the actual maintenance of the power module must determine the drive circuit to work properly. Whether the replacement power module is easy to cause damage again. In addition, we also understand the GTR IGBT module drive circuit module and the difference between the two power modules for the current drive the former, the latter voltage drive.

Of electronic components, the development of large scale integrated circuit, driver circuit are also constantly develop in the direction towards the high level of integration and the expanding functionality, performance is improving. Also for those of us engaged in the maintenance trades and frequency a higher demand, more than just himself in the frequency of some maintenance experience, but also hope that lots of people in this industry communication. Comment Large   In   Small

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