Ultra (ultra front front man Gao Pinlu) development

14 years ago,?a chance?to join the?high?industry,?14 years?be conscientious and do one’s best,?I?did not dare laches,?in order to?high-frequency?cause takeoff,?super?Feng who?have been working hard,development of?super?Feng electrical?as?you witness the?high frequency?in recent 20 years!!!

Overview of the development of?high frequencyinduction heating equipment,?there are four periods: the development of?period?-?mature application?-Application?-?improve the performance?period,?the following?four?stages were?described.?In 120th Century 70?many?units involved in the?research and development?stage?in our country?with thedevelopment history of?intermediate frequencyinduction heating?power supply,?we can put?its development?summarized as?70′s?research and development?period,?eighty’s,?ninety’s?mature?periodof?extended?period,?the late twentieth Century?to improve?performance.?Application of power semiconductor?devices?developed in China?with?high frequency power supply?of induction heating?inhistory can be traced back to the?nineteen seventies,?accompanied by the 1963?China’s firstthyristor?advent,?in 1970?our country develop?fast thyristor,?around 1972?many of our?units havestarted to research the?thyristor medium frequency power supply?can?say,?the domestic firstintermediate frequency heat?off the?stage of development?of?the many?units involved in thenineteen seventies.?Intermediate frequency?furnace heat?of this period?mainly?engaged in?research and development?in the field?of units,?the?period of the application?of?the core device?for?fast thyristor,the control circuit is a?plug-in?box structure?is composed of a plurality of?control board?manydiscrete components,?at the same time as thethyristor?production?technology constraints,?thestructure of main circuit?for?thyristor?blockingvoltage?is not high enough,?but two?thyristor?or three?thyristor?inverter?bridge arm,?the?number of applications?of the thyristor?is 8?or 12,?thusinevitably?accompanied by?pressure are?network fastthyristor,?at the same time?we should see?this period?because of?the thyristor?turn off?time is not too short,?so?determines the output?frequency?is notthe medium frequency power supply?high;?secondly,because of the dynamic?parameters dv/dt and?di/dt?of the thyristor?is not very high,?cause the system tolimit?dv/dt?and di/dt?networks are large and complex;?third,?at this stage?because?of the thyristor?reliability?is not very ideal?(at that time,?dubbed the “terrible?silicon”),?which is determined by the?stage?of intermediate frequency power supply?is?laboratory products,?is rarely?used in the industry.

2,?nineteen eighties?mature application?period

After 1980,?with the considerable progress?made inthe manufacturing process?of thyristor,?theintroduction of technology?reform and opening-up of our country,?the thyristor?reliability?obtainedgreat progress,?thus gradually?High frequency furnace ?high frequencyinduction heating?medium frequency power supply?has bid farewell to?the laboratory?to?use?in industrial production,?during this period the?thyristor medium frequency?power?inverter?has?gradually from the?fastthyristor series?transition to the?single thyristor,but the output?frequency?is not?very high,?muchbelow 2.5kHz,?the output frequency?to be?4kHz?or 8kHz?still?had to use?multiplication?of complex control?technology.?And?should see the?startingprogram of this?period?of Thyristor Medium frequency power supply?for?charging?links?with ramming?specialstarting scheme,?the plug-in?box type structure?and the control?plate?into a plurality of?small controlboard.?In general?the whole control system?is composed of twelve blocks of?control?board?(six rectifier?trigger board,?two?inverter?pulse?plate,?apower board,?a negative power supply?board,?a guard plate,?an?adjusting plate),?and?during this period the?fast thyristor?domestic?level?off?the fastest time?is 35 μ?about s,?and the?blocking voltage?does not exceed the maximum?1600V,?average on state current?up to 500A,?which determines the?induction heating?power?capacity of more than 350kW?by?medium frequency power supply?to?the?fast thyristorparallel?scheme.