Knowledge

LED Driver Power Factor and Load

Hello everyone, Today we will talk about the relation between power factor and load. As we know that power factor is a very critical parameter when we are designing the lights, and a key value which evaluates the pollution caused by the electrical device to the electricity grid.Normally it has to be over 0.9 according to the standards like energy start and ErP. What is Power Factor? Power factor is an expression of energy efficiency. It is usually expressed as a...

Why use high efficiency LED drivers

There are a number of reasons why it is advisable to use LED drivers with high efficiencies.Benefits of high efficiency LED driversThe first, of course, is the cost benefits of high efficiency drivers. The less energy that is required to provide the desired luminous output, the less it costs to power the fixture. Since one of the main reasons for switching to LED lighting is the accompanying cost saving, it makes sense to use a driver with...

What Type of LED Driver or Power Supply Do I Need?

Conventional AC-DC power supplies and DC-DC converters provide an output that is regulated toprovide a "constant-voltage." However, LEDs work most efficiently and safest with a "constant-current" drive. As a result, many new devices have been developed to provide this type of LED drive. LED power sources that provide a "constant-current" output have typically been referred to as LED drivers. In the past, AC-DC power supplies that provided a regulated "constant-voltage" to LEDs were referred to as LED power supplies....

What does IP means in LED drivers

The waterproof level of LED drivers is specified by two numbers known as Ingress Protection (IP) ratings, which are a measure of the environmental protection that the driver provides.The first number of the IP rating specifies the driver’s protection against solid materials, whereas the second figure specifies protection from liquids. A description of the levels of each of these two numbers is shown in the table below.IP First number – Protection against solid objects0No special protection1Protected against solid objects...

What is the difference between Constant Voltage and Constant Current LED Driver?

There are numerous types of drivers within the market to choose from for LED light fixtures.  However, while LEDs are considered constant current driven devices, why do manufacturers offer both constant voltage and constant-current drivers for LEDs and what is the difference?Constant Current LED Driver vs. Constant Voltage LED DriverFirst, let us discuss what exactly a constant current driver is versus a constant voltage driver. A constant current power supply varies the voltage across an electronic circuit allowing the...

lightning protection levels of LED drivers

The IEC 61000-4-5 standard and test-method establishes a common reference for evaluating the immunity of electrical and electronic equipment when subjected to surges such as lightning.Surge test standards for lightning protection as below, IEC61000-4-5 ranks:Level  Open-circuit test voltage1   0.5kV2   1.0kV3   2.0kV4   4.0kVX   SpecialNOTE X can be any level, above, below or in between the other levels. This level can be specified in the product standard.The lightning protection level of uPowerTek's LED driver products is 4K/6K in common mode, and 10K in difference mode.

8 Steps to Choose the Right LED Driver

We will talk about the selection of LED drivers. It seems that it is not difficult to select a driver, but it is indeed difficult to find a proper or suitable driver for an optimized light fixture product.Actually there are multi-steps during the selection of drivers and please check those steps listed carefully if you would like to find the right one. Step 1: Choose Application. The first step is that we have to understand whether you are looking for an...

Ripple Current and Flickering of LED

Hello, today we are going to talk about the flicker, or strobe flicker. Difference of flicker and strobe flicker First let's try to make the difference of flicker and strobe flicker clear. flicker normally indicates the instability of the light system, which can be obviously noticed by human eyes. And the flicker frequency is unstable but normally below 100Hz. And strobe flicker always refers to the ones with higher and stable frequency which is the twice of line voltage frequency. In...