Analysis of the reasons for the popularity of non-isolated LED tube
Analysis of the reasons for the popularity of non-isolated LED tube Wiring and transformation have many advantages, which are described below for your reference
Although there are many types and classification methods of LED tube, it is a bit dizzying, but there is a type of LED tube that are distinguished according to the type of power supply. Today we talk about non-isolated led fluorescent tubes.
Although there are many types of power supplies used by our LED tube, such as ordinary, dimming, emergency, induction, waterproof, etc., in simple terms, it is the difference between isolation and non-isolation. That's it.
To put it simply, the isolated power supply isolates the high voltage at the input end from the low voltage at the output end to prevent electric shock and reduce the risk.
To put it simply, non-isolated power supply means that the input terminal and output terminal are not isolated by a transformer, and the voltage is reduced, but there is a certain amount of voltage to drive the LED fluorescent lamp to work. What is the purpose of this? What are the benefits?
The purpose of the non-isolated LED fluorescent lamp is: First, the power supply becomes simple and the structure is not complicated. In the early days of the isolated power supply, there were more components. In order to achieve coupling, a transformer was added in the middle, and the transformer loss was large. Non-isolation came simple, the power supply volume Greatly reduced. Only need to change the string and parallel problem of the LED lamp bead, can promote the LED lamp bead to emit light.
What are the benefits of non-isolated LED tube?
Advantages 1. Low cost: As mentioned earlier, due to the simple structure, the use of fewer electronic components, the overall cost is reduced, and the price can be very cheap. For example, the price of an isolated power supply is as high as ten yuan, and a non-isolated power supply only costs a few yuan. The difference is several times, accounting for the cost of LED fluorescent lamp cost, and the impact is still relatively large.
Benefit 2.It is efficiency; the efficiency of the isolated power supply is affected by the isolation transformer, and the conversion efficiency is reduced. Non-isolation does not have this shortcoming, and the efficiency is high, as high as 92%, which is of great significance for the most demanding high light efficiency.
Benefit 3 production cycle; due to simplicity, easy production and processing, fast organization of production, fewer raw materials, low prices, and fast delivery, you can even stock up raw materials, do not reduce costs, and have many factors such as low supplier pressure.
A transformer is a device that transforms AC voltage, current, and impedance. When an AC current is passed through the primary coil, an AC magnetic flux is generated in the iron core, causing a voltage to be induced in the secondary coil. The transformer is composed of an iron core and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called the secondary winding. In a generator, whether the coil moves through the magnetic field or the magnetic field moves through the fixed coil, it can induce an electric potential in the coil. In both cases, the value of the magnetic flux remains unchanged, but the amount of magnetic flux intersecting with the coil is different. Change, this is the principle of mutual induction. Transformer is a device that uses electromagnetic mutual inductance to transform voltage, current and impedance. Transformer uses the principle of electromagnetic induction to transfer electrical energy or signals from one circuit to another.
Therefore, the transformer is a kind of conversion device, which can convert energy, and there will be conversion efficiency problems. Isolated power supplies have isolation transformers, and the conversion efficiency is of course lower than that of non-isolated power supplies without transformers.
The conversion efficiency is the ratio of the output power of the power supply to the input power: that is, the power conversion efficiency = the instant output power provided by the power supply to the host/the instant power of the input power × 100%.
Generally speaking, PC power supply specifications have certain requirements for conversion efficiency. Initially, the power conversion efficiency was only about 60%. In Intel’s ATX12V 1.3 power supply specification, the conversion efficiency of the power supply should not be less than 68% when fully loaded. In ATX 12V 2.01, higher requirements are put forward for the conversion efficiency of the power supply─ ─Not less than 80%. Therefore, when purchasing a power supply, everyone can roughly understand the power conversion efficiency from the power supply specifications it follows.
Power efficiency=output power/input power*100% PF is power factor=COSΦ=active power P/apparent power S Now most of the LED power supplies are switching power supplies, the efficiency can reach up to 96%; but that cost is very high. Generally about 90%, lower than this value, indicating that the technology, components, tooling, and quality are average. Follow-up: How to measure output and input power, what is COS? Does active power refer to the power consumed by the light source? Apparent power s? Where is it? Answer: Generally speaking, the input power of a switching power supply includes apparent power, active power and reactive power. The power factor is often used in alternating current. The output power is the output power of the switching power supply. Apparent power is defined as the effective value of the input voltage multiplied by the effective value of the input current. Active power is the effective value of the input voltage multiplied by the effective value of the input current and then multiplied by the power factor. It does work, but it is indispensable in the power supply. Active power divided by apparent power is the power factor. The output power is easy to measure. The output DC voltage multiplied by the output DC current is the output power. The output power divided by the input active power is the efficiency of the power supply! Single-phase watt-hour meters measure active power, and there are also meters that can test reactive power.
