Shindengen industrial listed for bidirectional thyristor LED lighting tube failure Countermeasures

The Japanese Shindengen industry developed a bidirectional thyristor in LED can prevent the open circuit fault of all lighting tube out of the "K1VZL09/K1VZL20", from the beginning of April 2010 production. The utility model is mainly used for the street lamp, the emergency indicator lamp, the light projector and the signal lamp which can not be completely extinguished. Product name "SAIDAC".

In a series of LED lighting appliances, when 1 LED open circuit failure, all the LED connected with it will be extinguished. Moreover, due to the impact of the failure of the LED, the voltage is likely to rise and destroy other LED. Therefore, the original has been used with LED and even zener diode (Zener Diode) method to solve. However, there is a problem in this method, because of the need to use higher than the LED drive voltage reverse voltage regulator diode, so the voltage regulator for the bypass state of the heat is very large.

In order to solve the above problems and the development of the product is the two-way thyristor. A bidirectional thyristor is a semiconductor device with a voltage that is more than the breakdown voltage. Moreover, the smaller loss of positive bidirectional thyristor, only zener diode 1/5 "(Shindengen industry). Therefore, it can greatly reduce the amount of heat in the bypass state.

The difference between K1VZL09 and K1VZL20 is the breakdown voltage. Use K1VZL09 series for 1 ~ 2 standard 10V voltage LED. Use K2VZL20 series for 3 ~ 5 standard 20V voltage LED. The maximum of the on state current is 1A, and the maximum current is 5 A. The maximum current is 20mA. The temperature range junction for 40 ~ 125 C. The overall dimensions are 5mm * 2.5mm * 2mm. Sample supply is now available. Sample price is 80 yen. (Editor: maysoong)

Bidirectional thyristor capable of being used for LED lighting failure countermeasure

Current and voltage characteristics of bidirectional thyristor. Measurement using diode characteristic curve tracer (Curve Tracer)

Scenarios for the actual use of bidirectional thyristors. Even if the 1 LED open circuit failure, the use of two-way thyristor power can be converted to bypass, so the series of other LED will normally be lit