Sapphire substrates used in the production Sapphire Dan Changjing furnaces power three-phase full-controlled bridge rectifier circuit the AC to DC rectifier , smoothing through the reactor after a constant DC current source , and then the single-phase inverter bridge , the DC current is inverted into a single phase of about 7KHz frequency current. Load from the induction coil and the compensation capacitor , which connects to the parallel resonant circuit is inductive furnace .

In the production process of crystal growth furnace to produce large harmonic current , harmonic mainly 2,4,5,7,8 , wherein about 70% of the second harmonic . Adjusting the power system current RMS and harmonic content will be a corresponding change: when working in a small load , depending on the current of 60A, current harmonic distortion rate of 110% ; in the large work load , depending on the current of 150A and current harmonic distortion rate of 76%. In the course of crystal growth furnace will produce about 60A ~ 120A current harmonics .


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Although Asian countries have actively amplified Sapphire Dan Changjing production capacity , but countries industry trends and current situation varies greatly, and some vendors to support key government forces sent exhibition , some leading polysilicon manufacturers , electronic or branched into , or by the LED related to the upstream vendor integration , showing a variety of industrial style , but also show Sapphire Dan Changjing industry has entered the fast-growing , highly competing industrial phase. Select the most positive development of the following South Korea , mainland China and Taiwan industry status and trends analysis.

Korea Sapphire Dan Changjing Industry : The South Korean government has given the sapphire single crystal materials domestic supply capacity is low, and the key equipment and technology for the control of the US-Russian manufacturers , so in 2010 the ten key materials to promote the development plan (World Premier Materials development program) in selected LED sapphire single crystal material as the main R & D projects , total capital investment in 2018 will be up to 13,743 won. Fostered by the government to enhance its own vendor-specific technology and capacity advantages , the South Korean manufacturer Blaupunkt Dan Changjing production capacity in early 2011 that is promoted as the world's first . The South Korean government to help manufacturers in the near future US-Russian giant breakthrough technology patents , fast substantially increase its capacity , not only to guide their domestic manufacturers cut high growth and high profits in the emerging field , more South Korean development of LED industry reserves a solid material supply capacity.

Crystal growth furnace harmonic currents produced by a large number of crystal growth furnace and the surrounding equipment had a serious impact, as follows:

1, The harmonic current serious impact on crystal growth furnace power supply output power quality, resulting in low yield sapphire crystal;

2, The harmonic current occupancy capacity of the power supply line, resulting in a high temperature heat supply cable, power cable temperature rise over 40 degrees;

3, The harmonic currents produced by equipment on the surrounding severely affected in the un-harmonic control, the entire workshop equipment can only be turned on simultaneously 60%, or cause power grid tripping;

4, The harmonic currents cause for isolating transformer burned out.


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Sapphire Dan Changjing past technology and production capacity , begin with the United States and Russia, among the few leading manufacturers , forming oligopoly market structure . However, Asian manufacturers resource betting with the government in Dachang focus support industrial investment to enhance heat production capacity substantially within a short expansion , industry outlook also appears dramatic changes . Sapphire Dan Changjing long before 2009 by the American Rubicon industry suppliers Monocrystal the oligopoly with Russia , both of which more than 50% market share . With the expansion of the LED industry and the production center of gravity toward the Asian region significantly , Asian manufacturers began to actively entered the LED is mainly upstream material Sapphire Dan Changjing fields.

Sapphire Dan Changjing Korean giant Sapphire Technology Company (STC) in Korea focusing policy support, the most actively expand the plant operation , at the end of 2010 can produce up to 760,000 mm, has overtaken the American past, a leading provider Monocrystal Rubicon with Russia and achieved the world's first location, and in 2011 continued to lead the expansion plan , can produce up to 1.3 million mm. Preceding three manufacturers will become the world's first breakthrough 1,000,000 mm production scale manufacturers , the total market share will reach 60%. While Taiwan's ACME ( USI photovoltaic ) , Xin crystal diamond , aquamarine Yunnan in China , Korea, Astek, were higher than the magnitude of its plant expansion relatively conservative Japanese factory Kyocera, Namiki and French materials giant Saint-Gobain, Asian manufacturers are expected capacity in 2011 will be significantly improved ranking . By country breakdown capacity ratio , can be more clearly observed Sapphire Dan Changjing global industrial chain is rapidly moving towards the trend of the Asian region .


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