Non-isolated drive LED bulbs reduce volume and cost

The price of LED bulbs is falling. A year ago, it cost about $50 to buy a Philips 60W dimming LED bulb that would replace a vintage light bulb. Today, at Best Buy, you can buy 8W, 800 lumens Insignia for your home brand for just $17. The bulb can replace the 60W incandescent bulb. What changes in the design of LED bulbs have led to this cost reduction? The disassembly of the LED bulb allows us to see some of the design trends in LED lighting, such as how to place the LED in the bulb, and what drive architecture is used.
1. The shape of the Insignia bulb is similar to the traditional incandescent lamp we are familiar with, except that it has three metal fins and a plastic (not glass) base.
2. A Dremel tool can be used to remove the outer casing of the plastic bulb, revealing six CREE white LEDs that illuminate the light source mixing chamber of the bulb to produce a uniform illumination. The LEDs are mounted on metal fins that are used to support both the LED chip and the heat sink. At the bottom of the mixing chamber is an extremely thin aluminum reflector that assists in the reflection of light within the bulb. All of the bulb's circuitry is in the bulb holder under the reflector, in a separate enclosed compartment.
3. Disassemble the infused rubber compound, showing two PCBs next to each other, and the circuit is on top. In the figure, the two PCBs are separated, next to the bulb base.
4. For the sake of comparison, a drive circuit for an LED lamp disassembled about one year ago is shown. In addition to the great differences in packaging, there are many more electronic devices. For example, the earlier design had three electrolytic capacitors and a very large transformer.
5. Two generations of drives are shown side by side in the left: Insignia drives have only two relatively small electrolytic capacitors. This structure poses a problem: Which LED driver IC is used for the bulb, how does such a small driver do it?
6. Q&A: The word "SULB" on the small IC is the mark of the Texas Instruments LM3445. It does not use a transformer, indicating that the LED driver is a non-isolated design. The design of incandescent lamps is itself non-isolated. If you break the glass of an incandescent light bulb and the light bulb is plugged in, you can directly access the AC power source. Obviously, non-isolated designs can be fully compliant with UL specifications. Note: Although a non-isolated AC/DC LED driver is designed to be both safe and UL compliant, developing and testing a non-isolated offline LED driver in the lab still requires rigorous laboratory safety procedures.
Dimming of light bulbs is an important feature of the US market. I have used the Lutron Maestro dimmer switch, which has programmable dimming control, and I compared it to the incandescent lamp item by item. Insignia dimming is stable and smooth, and the dimming curve is similar to incandescent lamps.

1.0mm (.039″) Pitch Pin Headers

Overview

Antenk offers a variety of high quality and competitively priced 1.0mm pitch single, dual, three, quad row pin (male) headers used in many board-to-board PCB connections, fitting small-sized, densely-packed devices.


This low-profile component is made from high-temperature thermoplastic and is offered with several means of connections and mounting styles such as through-hole (THM) or surface mount (SMT) and can be in vertical (straight), elevated or at a right angle configuration/orientation dissipating current of about 1.0 A or less.


The pin (male) header is generally mated with receptacle or stackable header connectors (female sockets). This types of pin headers are suitable for PCB board to board connection or for signal transmission application.


Applications of 1.0mm Pitch Pin Headers

Its small size is most suitable for PCB connections of small equipment and devices such as WiFi equipment, gaming consoles, measurement instruments, and other equipment in need of a special interface to become interconnected


Mount Type: Through-hole vs Surface Mount

At one side of this Pin Header is a series of pins which can either be mounted and soldered directly onto the surface of the PCB (SMT) or placed into drilled holes on the PCB (THM).


Through-Hole (Poke-In)

Best used for high-reliability products that require stronger connections between layers.

Aerospace and military products are most likely to require this type of mounting as these products experience extreme accelerations, collisions, or high temperatures.

Useful in test and prototyping applications that sometimes require manual adjustments and replacements.

1.0mm vertical single row header, 1.0mm vertical dual row header, 1.0mm Elevated single row pin header, 1.0mm Elevated dual row pin Header, 1.0mm Right-angle single row header and 1.0mm Right-angle dual row header are some examples of Antenk products with through-hole mount type.


Surface-Mount

The most common electronic hardware requirements are SMT.

Essential in PCB design and manufacturing, having improved the quality and performance of PCBs overall.

Cost of processing and handling is reduced.

SMT components can be mounted on both side of the board.

Ability to fit a high number of small components on a PCB has allowed for much denser, higher performing, and smaller PCBs.

1.0mm Right-angle Dual Row pin header, 1.0mm SMT Single row pin header, 1.0mm SMT Dual row pin header and 1.0mm Elevated Dual Row Pin Header are Antenk`s SMT pin headers.

Soldering Temperature for 1.0mm Pitch Pin Headers

Soldering SMT pin header can be done at a maximum peak temperature of 260°C for maximum 60 seconds.


Pin-Type: Vertical (Straight) and Right-Angle

1.0mm pitch headers may be further classified into pin orientation as well, such as vertical or straight Male Header or right-angle male header.


Vertical or Straight Pin (Male) Header Orientation

One side of the series of pins is connected to PCB board in which the pins can be at a right-angle to the PCB surface (usually called "straight" or [vertical") or.

Right-Angle Pin (Male) Header Orientation

Parallel to the board's surface (referred to as "right-angle" pins).

Each of these pin-types have different applications that fit with their specific configuration.


Pcb Connector Stacking

Elevated Pin Header Orientation

Elevated pins aka Stacked Pins or Mezzanine are simply stacked pin headers providing an exact distance requirement between PCBs that optimizes electrical reliability and performance between PCB boards.


Profile Above PCB

This type of configuration is the most common way of connecting board-to-board by a connector. First, the stacking height is calculated from one board to another and measured from the printed circuit board face to its highest insulator point above the PCB.


Single, Dual or Multiple Number of Rows

For a 1.0mm straight or vertical Male Pin Header, the standard number of rows that Antenk offers ranges from 1 to 2 rows. However, customization can be available if 3 ,4 or n number of rows is needed by the customer. Also, the number of contacts for the single row is about 2-50 pins while for dual row, the number contacts may vary from 4-100 pins.


Pin Material

The pins of the connector have been designed with copper alloy. With customer`s demand the pins can be made gold plated.


Breakaway design

The pin headers are also equipped with a breakaway design making them fully compatible with their female receptacles.


Custom 1.0mm Pitch Pin Headers

Customizable 1.0 mm pitch pin headers are also available, making your manufacturing process way faster as the pins are already inserted in the headers, insulator height is made at the right size and the accurate pin length you require is followed.


Parts are made using semi-automated manufacturing processes that ensure both precision and delicacy in handling the headers before packaging on tape and reel.


The tape and reel carrier strip ensures that the headers are packaged within accurately sized cavities for its height, width and depth, securing the headers from the environment and maintaining consistent position during transportation.


Antenk also offer a range of custom Tape and reel carrier strip packaging cavities.



1.0mm Male Header

Male Header Pins,1.0Mm Male Header,1.0Mm Pin Header,1.0Mm Male Header Pins, 1.0mm THM Male Header, 1.0mm SMT Male Header

ShenZhen Antenk Electronics Co,Ltd , https://www.antenk.com

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