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You should have seen a lot of GaN chargers.
But have you ever seen a GaN power supply of LED?
That’s right.
The power supplies of LED also began to use GaN technology.
It’s very likely to replace the silicon power supply
and become the standard of high-end LED products soon.
Today, we will share this LED power supply with you, whose power is 200W.
Yes, just because of GaN components, it can reach 200W using this flat and ultra-thin PCB.
The length is about 196mm (7.72 inches). The width is about 35mm (1.38 inches).
The thickness is only 12mm (0.47 inches).
Almost the same thickness as the iPhone 12 with a case.
We found the power density of this power module has reached 2.5W/cm3
Which is equivalent to 1.6 times of OPPO 50W mini SuperVOOC charger
and two times of Xiaomi 65W GaN fast charger.
Compared with Huawei 200W power adapter.
You can see how small of this GaN power supply of LED is.
The front of the PCB will be some plug-in components.
Including inductors, capacitors, transformers, etc.
The control circuit is on the back and composed of SMD components.
To reduce the thickness, two inductors and transformer adopt through-hole technology.
This LED power supply adopts the architecture of PFC+LLC.
The output is fixed DC voltage.
On the front, Here is the filtering, boost, and rectifier circuit.
The middle part is the filtering circuit after PFC boost.
And the LLC power supply part is on the right side.
On the back, here is the control circuit of PFC boost.
The control circuit of LLC is in the middle.
The synchronous rectifier circuit is on the right.
The input side is equipped with a fuse of 2A 250V, two common mode chocks, three red film capacitors
and a yellow safety X capacitor.
And there are two SMD Y capacitors in here, from TRX.
Four rectifier bridges are on the small board.
This is the PFC boost inductor.
And this PFC controller from ON Semiconductor can control this Innoscience’s GaN component and finally drive the inductor.
This GaN switching transistor has 650V withstand voltage and 130mΩ conductance.
In the PFC circuit, it can reduce the switching loss and the conduction loss.
By the way, Innoscience is an integrated device manufacturer.
Its GaN switching transistor adopts industry-leading 8-inches processing technology.
which is also the first mass-produced advanced GaN components on the market currently.
The PFC boost rectifier tube is next to the boost inductor, which adopts the diodes from WeEn.
Withstand voltage is 600V. Rated current is 5A.
Here are five electrolytic capacitors for high voltage, which come from Yongming KCX series.
The specification is 420V, 22μF.
This inductor is the resonant inductor in the LLC architecture.
The big one is the main transformer.
Then, let’s see the control circuit on the back.
The master control chip of LLC power supply adopts ON Semiconductor’s NCP13992.
Which is also a high-performance current-mode controller of
half-bridge resonant converter.
It implements 600V gate drivers.
This is a half bridge composed of two Innoscience’s GaN components,
responsible for LLC resonant switching.
Model is INN650D02.
Withstand voltage is 650V. Resistance is 200mΩ.
The GaN components here can further reduce the switching loss of LLC topology.
Here are three LLC resonant capacitors.
The output side has a synchronous rectifier chip
and two synchronous rectifier MOSFETs
The chip comes from ON Semiconductor.
Model is NCP4306. Two MOSFETs come from Infineon.
Here are two Y capacitors and an optocoupler on the front side.
There are five electrolytic capacitors from Yongming and an inductor at the output
to compose the filtering circuit,
which makes the output voltage purer.
A synchronous rectifier chip is under the output filter capacitor.
With high-performance requirements, the traditional power supply will have disadvantages,
like large size and heat generation.
It becomes less and less adaptable to the needs of high-end lighting design.
As the third-generation semiconductor material,
GaN components is a new and very forward-looking attempt in the field of LED power supply.
Ok, that would be all for today's video.
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