hz-elect

  Application of LM393 in LED drive power supply From:  www.hzleddriver.com   The LM393 comparator is a high-gain, wide-band device that, like most comparators, is prone to oscillations if coupled with parasitic capacitance from the output to the input. This phenomenon occurs only in the gap between the output voltage transitions when the comparator changes state. Power supply and bypass filtering cannot solve this problem, and the design of standard PCB boards helps to reduce input-output parasitic capacitive coupling. Reducing the input resistance to less than 10K will reduce the feedback signal, and increasing even a small amount of positive feedback (hysteresis 1.0~10mV) can lead to rapid conversion, making it impossible to generate oscillations due to stray capacitance. Unless hysteresis is utilized, inserting the IC directly and adding resistance to the pin will cause the input-output to oscillate over a very short transition period. If the input signal is an imp...

  The main factors affecting the life of LED drivers From:  www.hzleddriver.com           Unlike ordinary incandescent bulbs, LED lamp beads can be directly connected to AC mains. Since LEDs are characteristic sensitive semiconductor devices and have negative temperature characteristics, LED devices to have almost harsh requirements for driving power. According to the characteristics of LEDs, the use of places, and environmental requirements, more complex driving power must be designed for different purposes LED lamps and lighting equipment. When choosing the LED power supply, not only should various suitable parameters be selected according to the series and parallel mode of the LED lamp beads, but also a high-quality, long-life power supply should be considered to meet the needs of long-term effective operation of the LED lamp. It can be said that the life of the LED driver determines the life of the LED lamp. What factors affect the life of the...

  How do you wish Merry Christmas? From:  www.hzleddriver.com       Christmas is coming.Are you ready?What's the first image that comes to your mind when talking about Christmas?Like,antlers,Christmas trees,Santa Claus,stockings,reindeer,Christmas hats,Christmas songs,Christmas revelry?Maybe Santa Claus with a white beard,sneaking up the chimney with a bag full of Christmas presents for surprise?Or the dazzing Christmas decorations,Christmas trees decorated with Christmas decorations and lights?          How do you prepare Merry Christmas?       ChriChristmas is the warmth of winter, and the Same as the Chinese New Year, we can use this holiday to get together with family, but also can have a Christmas carnival with friends, at this time only happy without worries. Once a year, How do you prepare Merry Christmas?How do you wish Merry Christmas? I would love to hear your share, because I want to feel your Christmas atm...

  How can led driver  efficiency be improved? Victoria Liang          hzled07@gmail.com         In order to improve the efficiency of LED drivers, we need to know what factors affect the efficiency of LED drivers? Fig1   Huizhou Hi-zealed Electronic Co., Ltd ---Test         The main function of the LED lighting driver  is to convert the input AC voltage into a current whose output voltage can vary with the LED forward voltage Vf conduction voltage drop. The LED driver is a key component for the effective operation of the LED   light . The quality of the LED driver directly affects t he reliability and stability of the overall lamp. Fig2 Led driver for lighting         Based on 1 6  years of experience in the production and development of LED drivers , we have summarized the following main reasons that affect the efficiency of LED   power supply : Fig3  led p...