低功率 LED 照明趋势解决方案－第四部分

A19, E14 / 17, E26 / 27 bulb LED Driver Design

LED lighting trend in our blog series, we discussed the MR11 / 16 LED driver design problems. Now, let’s look at A19, E14 / 17, E26 / 27 bulb LED driver designs.

Some bulb type is called “screw caps” and “candle light.” Most with CFL or LED incandescent replacement, has won the majority of application requirements.

A19, E14 / 17, E26 / 27 screw bulb structure

Input voltage directly from the AC power socket type: E14 / 17 (Candle), A19 / E26 / 27 (screw type) (for candle lamp, rated 1~5W; to replace incandescent lamps, rated power 4~17W.) dimensions shown in Figure 1 and Figure 2.

Figure 1. Example candle lamps ((L: 99 毫米, D: 26 毫米, E: 17 mm) of

Figure 2. Example Edison light bulb (L: 105 毫米, D: 55 毫米, B: 26 mm) of

A19, E14 / 17, E26 / 27 screw bulb LED Driver Design Challenge

For candle lights, the LED driver design challenge is a small printed circuit board space. The printed circuit board space is less than the MR lamp space, and works in AC input voltage source. With LED driver designed to replace incandescent lamps, which printed circuit board space than a candle lamp or lamps MR large, rated power is large, and therefore LED driver as well. Printed circuit board space is limited, like candle lamp. For screw bulb design, power factor and total harmonic distortion is almost mandatory requirements, there are additional dimmers operating requirements.

For a lamp holder side parabolic E26 / 27 bulbs, printed circuit board dimensions of lampholders side: 20 mm; LED module side: 35 mm; width: 70 mm (see FIG. 3 ) .

Figure 3. E26 / E27 PCB Dimensions Example

It must be greater than 75% efficiency. Dimmer compatible with a variety of design requirements include holding current, in a wide range of optical amplitu...