Technical iteration of downlights
First generation: low-voltage LED lamp beads (total voltage less than 48V) + switching power supply.
Features: Large size, high cost, good light source effect, slow attenuation, highest safety factor, easy to pass safety regulations
Application: high-end markets such as track lights and security lights
Second generation: high-voltage lamp beads + linear power supply or ACDC non-isolated power supply, everything is arranged on an aluminum substrate
Features: It is relatively simple, has the lowest cost, and can be very powerful, but it is difficult to pass safety regulations.
Application: mid-to-low-end markets such as bulbs, downlights, spotlights, ceiling lights, etc.
Third generation: DOB (high-voltage lamp beads + linear power supply or ACDC non-isolated power supply, everything is arranged on an aluminum substrate )
Features: The thing is very simple, has the lowest cost, has poor heat dissipation, is difficult to increase the power, and is not easy to pass safety regulations, but is easy to mass-produce.
Application: low-end markets such as bulbs, downlights, spotlights, etc.
Fourth generation: COB (highly integrated lamp beads + linear power supply)
Features: small size, good fan thermal performance, high designability, good light efficiency, and can also be mass-produced
Application: mid-to-low-end markets such as spotlights
Latest: IC LED
Features: Integrated chip and LED are in the same package. There is no need for a separate driving power supply, higher integration, lower overall cost, easy assembly, and retains the excellent light quality of COB.
Quality advantages: Typical luminous efficiency can reach more than 90lm/W; PF>0.9; Typical color rendering index can reach more than 85. Since the thermal conductivity of ceramic substrates is much better than that of aluminum substrates, and bare crystal packaging solves the problem of heat dissipation well, IC LEDs make lamps have less light decay, better performance, and longer life.
Certification advantages: Ceramic sheets have a voltage resistance of 6000V without breakdown during certification, no EMI electromagnetic interference, and pass the surge test under EMC 600V, so they can pass all certifications such as UL, CE, RCM, 3C, etc., and comply with global safety regulations. .
Application: Markets with very high light quality requirements.
Targeting the downlight market;
The requirements are relatively simple, mainly two-color + segmented dimming + slow start and slow off functions. Dimming should be as soft as possible.
Downlight power is 5W, 9W, 12W
Spotlight power is 5W, 10W, 15W
Temperature parameters marked on the shell: -40~50℃ or -20~55℃.
The temperature on DOB lamp panels is generally controlled at around 50°C.
Antenna processing method:
- The RF chip antenna and the power drive board are placed separately outside the downlight structure and are connected to the LED light board through wires.
- The RF chip antenna is made together with the power board and placed at the tail of the downlight, and the downlight is formed into a whole through structural parts.
- Through the DOB method, the chip antenna is integrated on the LED light panel. The light panel is made of non-metallic material and the downlight is made of plastic structure.
- Through the DOB method, the chip antenna is led out through flying wires, the light panel is made of aluminum alloy, and the downlight may be made of aluminum or plastic.
Power driver instructions:
In the market, there are generally divided into non-isolated power supplies and isolated power supplies.
But from a technical perspective, it can also be subdivided into: linear power supply, ACDC non-isolated power supply, and isolated power supply. Performance and reliability increase in sequence, while complexity and price decrease in sequence. See table below.
| Classification |
Schematic diagram |
Component features |
Performance characteristics |
Features |
cost |
Chip model |
| linear power supply |
 |
There are no inductors, electrolytic capacitors, or transformers, and the components are minimal. |
It has high power factor, high power efficiency, and long life. It only supports a single input voltage, has poor light efficiency, and has stroboscopic effects. |
Does not support PWM dimming or analog dimming. Some chips come with segmented dimming |
lowest |
Jingfeng: BP5136HC |
 |
There are no inductors, no transformers, and the components are very simple . |
Poor reliability, poor light source effect, poor safety, difficult to obtain certification, and can be mass-produced |
Some chips support PWM dimming (requires an external auxiliary power supply), analog dimming, and segmented dimming. |
very low |
Yachengwei: RM9006 |
|
| ACDC non-isolated |  |
There is no transformer |
The reliability is high, the light source effect is good, the safety is poor, and it is not easy to pass the certification. |
Most chips support PWM dimming (requires external auxiliary power supply), analog dimming, and segmented dimming. |
Price is low |
Jingfeng: BP2867 |
| Isolated Power |
 |
There is no inductor, |
High reliability, good light source effect, high safety, and can be certified. |
Some chips support PWM dimming (can use auxiliary power supply or only secondary output power supply), analog dimming, and segmented dimming. |
high price |
Jingfeng: BP3336 |