Linear drive power chip changes the future

The linear scheme refers to the use of a linear regulator to achieve control of the LED current. The linear regulator, as its name implies, is based on the use of a balanced section of the switching tube to balance the input voltage to effect the constant current regulator controller (conventional switching control is the switching control state), somewhat similar to LDO.

LED linear drive technology is a new generation of power technology, no high-frequency switching action, so there is no hidden worry of EMC; can also save the magnetic components such as transformers, some applications can also save electrolytic capacitors, achieve high PF, low THD. Considering power consumption, the main difficulty of IC now is how to achieve a wider input voltage and achieve high efficiency. In the region where the grid is relatively stable, single-stage control has its advantages of low cost and high performance, and it has gained a large application. Applications include flat bulbs, filament lamps, thyristor dimming, etc.

1, (planar) bulb lamp application


Figure 1 LED bulbs with plastic aluminum structure

Bulbs, as the name implies, are bulb-shaped lamps. Since Edison invented the tungsten bulb, its shape has been deeply rooted in people's hearts. There is not much development in appearance, but the content is changing with each passing day. Energy-saving lamps (scientific name CFL compact fluorescent lamps) have been leading the way for years, energy-saving and high efficiency is synonymous with it; now, the LED era has come, LED is far superior to traditional CFL lighting products in terms of lighting principle, energy saving and environmental protection. In the case of the same light effect, the energy consumption has dropped to 1/8 of the incandescent lamp and 1/2 of the energy-saving lamp, and it is naturally suitable for dimming.

The biggest market for LED bulb lighting is the civilian market. To prevent glare problems, the outer casing is usually made of frosted glass or acrylic. It can be driven directly by the mains. The following picture shows the LED bulbs of the commonly used plastic aluminum structure.

The traditional meaning bulb bulb is SMT type, so we refer to the plane bulb lamp for short. Now, how a typical LED bulb is driven to illuminate.

Figure 2 shows an 800lm bulb lamp solution made with PT4515. As can be seen from Figure 2, the line is extremely simple, REXT sets the LED output current, and OUT is the regulator output, which is used to adjust the fluctuation caused by the input voltage. The PowTech PT4515 has only 3 pins. In addition to the traditional current regulation, the constant power output characteristics can greatly expand the application range, making the system more stable and reliable.

Figure 2 An 800lm bulb lamp solution made by PT4515

The linear drive of the bulb has the obvious advantage that it does not require the use of electrolytic capacitors and magnetic components. The entire lamp electronic component is composed entirely of patch components, which can realize automatic production, improve reliability and improve production efficiency and reduce the efficiency. cost. Figure 3 is a photo of a photovoltaic engine consisting of this scheme, the entire system being all patch components. Very simple. Figure 4 is a thermal imaging diagram of this photovoltaic engine when it is illuminated, showing that the heat distribution is uniform. Figure 5 is an LED bulb consisting of this photovoltaic engine.



Figure 5 LED bulb consisting of photoelectric engine

2, filament lamp application

The filament lamp is another form of the bulb lamp, and the LED lamp bead is a wire shape similar to a matchstick type. The filament lamp was first introduced in 2008. The traditional incandescent lamp made of LED lamp beads made by the Japanese oxtail light source has attracted great attention in the industry and mass production. Then the candle lights and bulbs with LED filaments as the light source began to appear in large numbers and were accepted by more and more consumers. At that time, the applicable occasions were mainly in indoor lighting places such as five-star business hotels and high-end luxury houses. In people's psychology, it is a high-end synonym. Because it has two spirits, retro and innovation, but it has not been widely used. With the advancement of technology, the price of LED filaments has been reduced, and the filament lamps have gradually become civilians and have begun to fly into the homes of ordinary people.

The shape of the filament lamp is very similar to that of the tungsten filament lamp. Several filaments are cleverly connected to form a variety of classic shapes, and the full-circumference design makes it safe and dead. The basic structure of the filament lamp is shown in Figure 6. The LED lamp bead is bound to the transparent substrate, and then the phosphor is coated. The upper electrode is used as the upper electrode, and the power is applied to emit light.

Figure 6 LED filament light

The filament lamp generally considers the self-heating condition, and the design is high-voltage and small-current. The LED driver needs precise constant current control. The filament lamp is limited by the volume in many cases, and the linear solution has special requirements. Usually for the two commonly used lamp holders, E26/E27 and E12/14 models, PT4515 has a corresponding solution.

E26/E27 lamp head solution

For the linear constant current driving power supply of E26/E27 lamp head, especially the high voltage, the filament is required to be connected in series to improve the efficiency. Figure 7 is the filament lamp (3 string 2) application circuit and power supply picture made by linear drive chip (PT4515). Because the E27 lamp head is relatively large in volume, heat treatment is relatively easy, and in order to save costs, the electrolytic capacitor may not be needed here.


Figure 7 Application circuit and power picture

Of course, some filaments can also be made into 4 series applications, plus electrolysis, at which time the efficiency can be more than 90%.

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Grow Lights are a great choice for growers who are dealing with hot HPS lights and want to change to something that's going to run cooler. Although LED Grow Lights do produce heat,the smaller models might not bring up the temperature of your grow space.Even the more powerful models of Led Grow Lights that produce a lot of heat still have built-in cooling systems to help prevent the heat from beaming directly down onto your plants.


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WHAT MAKE UP AN EXCELLENT LED GROW LIGHT ?

1.PPFD Value : PPFD is Photosynthetic Photon Flux Density. When you choose a plant light, you should compare the PPFD values of different plant lights. The larger the value, the better the growth of the plant.

2.Actual Power: Because the actual power of the plant light always varies with different conditions, all Amazon sellers use the rated power to describe the power of the product because the rated power is constant. When you pick a LED grow light, the rated power of the plant light is a reference, and more importantly is the actual power.

3.Core Coverage: In addition to the above two, when you choose a plant light, you also need to compare the cover area of different plant lights, of course, the size of the core coverage area. In general, in germination stage, you can hang the plant light higher and the cover area is larger. In flowering stage you can hang the plant light lower and the cover area is smaller because the plant needs more light at this stage. You have to compare different coverage areas to choose the plant light that suits you.


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Detailed images of 2000w cob led grow light

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Applications

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Packaging and Shipping

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1. UPS/DHL/FEDEX/TNT /EMS for samples, Door-to-Door;

2. By Air or by Sea for batch goods, for FCL; Airport/ Port receiving;


3. Customers specifying freight forwarders or negotiable shipping methods!


4. Delivery Time: stock avaiable sample will be delivered immediately ; 3-7 days for trial order; 7- 25 days for batch goods


Suggestions:

1.Clean the dust inside every 6 months to ensure the good heat dissipation and long life time.

2.Don`t keep too short distance to the plant canopy to avert leaves bleaching.

3. Highly hang the lamp will weaken the energy and affect the growth cycle of the plants, so the lamp should not be hang  too high.

4. While taking care of the plants, please spray the leaves and branches 2-3 times everyday, to ensure the plants do not wrinkle a wither, and have no phenomenon of few fruit, and hard pericarp


Trade Terms 

Payment: T/T, L/C, Paypal, 30% deposits before production, 70% balance to be paid before deliverying(Western Union are welcome)

Sample will be delivered within 7 working days.

Discounts are offered based on order quanlityes.

MOQ:sample order are acceptable

Delivery ways:DHL,UPS,FedEx,TNT, door to door,by sea,by air,etc.

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