The appropriate switching frequency for your LED
Which switching frequency we should choose?
The led switching frequency bears directly on led. As such, requirements must be considered from this two-fold vantage point,
- Viewed from the noise point，Keep your lowest switching frequency as far from these 20K as possible.
switching frequency of low-intensity noise can be resolved .when the lowest switching frequency has been below 25-30K.
- From a EMI perspective, The highest switching frequency should not be setup to the 150K .the point are stand at the threshold of EMI drop
A high quality of DC regulator can be obtained by adjusting the switching frequency in a modest variety.
Dimmer technology
We can through PWM dimmer technology, to adjust the led ‘light and shade degree. compared with analog electronic light-controlled technology, it has many virtues, such as strong robustness and convenient storage of signals. this article presents a brief discussion about the related technologies of Dimming LED.
The PWM Frequency must be more than 100HZ . this value should be greater or equal to 100 Hz can be easily accepted by human eyes. in here Have a purpose and success criteria for this PWM technology .The light bright of LED is proportional to the duty cycle of pulse .the current of PWM can not be adjusted too low. otherwise, the led color will lead to discolour .
We’ve made a sale a large number of 5730smd led today. there are a number of distinguishing characteristics by which you can identify a 5730smd led (warm white).
●Low power, less heat, saving heat costs, and cost savings.
High thermal conductivity of composites.
High current（60-150mA）
●Excellent resistant capacity
●Light source uniformly , display with wide visual angle;
Main parameters
The power of led strip
No deliver for such power supply when buy led strip. so learn more about these Knowledge point and make it full use in your light system. The most frequent of these is 0603LED strip ,1210LED strip,3528LED strip,5050LED strip. Then we made a list of some other parameters for you information, see below please:
series connection and parallel of led
The series connection have an advantage over the parallel connection on circuit design . Why is this?
We are making further investigations and will take the parallel connection of led from there . The VF(Forward Voltage)have been varied. Differences also exist between different VF of the same batch of LED. the forward Voltage changes Along with the rise of temperature and work current, so the parallel connection of LED is not recommended.
UV LED device is not working correctly for quiet analysis
ⅠThe trouble cause by supply power problem
This poles are the key components in a supply power. so the battle line is not allowed to access anti-Line. If the multimeter is used to measure DC voltage or DC carnet, we must be careful that the polarity is not reversed.
please exchange poles at once if not the direction might be wrong;
ⅡSomething is wrong with the uv led module
The uv led module need by strengthening the final inspection and testing to ensure(yet that is exactly what our QC often does. good quality of uv led strip need professional manufacturer).
if didn’t stick product religiously will get into trouble. These are common problems:
1：Iron bracket make heat conduction poor cause the temperature of plate higher, in here we suggests using a copper bracket. In experimenting we find out that the efficiency of white LED using copper brackets is higher than iron brackets, moreover, the light decay is lower about 10%.
2: Epoxy resin etiolated
3: Not compact or dense in led core and led bracket
4: when led core quality is poor, the more the loss of optical power will be
First we have to know exactly that LED is diode because belongs to transistors. so it can not be measured in register . the LED would cause a voltage drop As the white LED lights . whatever the current are . other words: the diodes conduct could bring fixed voltage drop, Unlikely to change over current.
Another method :looking at the internal resistances of LED of change with LED of current-voltage curves.
LED of knowledge points(color acronyms)We has been a LED for years,we’re going to have to do some conclusions and explore.
New some discussion and summation of the led color acronyms. as shown in the list below.
Electrical energy is so useful because it is readily converted into other useful energy.the electrical energy is so amazing . led drive power supply ‘s exactly what he’s counting on.The input power are translated into particular way(LED voltage and LED electrical current) by led power supply to drive LED . Usually, When it is used in the AC 220 V circuit (Suppose we have a input resource) . It consists of AC 、low voltage DC、high power voltage DC、low voltage high frequency . the market provide most of the constant current source . Constant current source can avoid the fluctuations of output current due to the fluctuations of input voltage, and maintain the brightness of LED. the Core components of led power supply include: Switching Controller 、MOSfet 、Feedback resistor、input filter device elect (Phase Locked Tracking filter).
