100 watts fast charging is the future popular trend, with the popularity of notebooks and mobile phones and other high-power devices, there have been a number of support 100W and higher power chargers launched to meet the needs of consumers for fast charging. The previous 100W or higher power fast charging mostly used LLC architecture with synchronous pressure reduction, which was higher in cost, resulting in higher product prices and suppressing market demand.
Biyiwei has launched a cost-effective 120W Gallium Nitride fast charging source scheme, which adopts a critical mode boost PFC + quasi-resonant flyback + synchronous rectification topology architecture, supports a wide range of voltage output, and does not require the use of a secondary buck circuit. Compared with the LLC architecture, it saves the cost of isolated drivers and a gallium nitride switch, and supports wide voltage output, saving the cost of secondary buck circuitry, and is a high-performance and cost-effective high-power fast charging solution.
And with the display support PD fast charge output in recent years, for the notebook to achieve a wire pass, Biyi micro cost-effective solution can also provide higher power fast charge for the display. 100W PD output meets the charging and use needs of high-power notebooks, releases performance shackles, and improves product selling points.
First, Biyi micro 120W gallium nitride fast charging source reference design appearance
Biyiwei 120W Gallium Nitride fast charging scheme adopts PFC+ flyback architecture, supports wide voltage output, and the circuit is significantly simplified compared with the LLC scheme, which has obvious cost advantages.
The Biyiwei 120W Gallium Nitride Power Supply Reference Design adopts two small boards to solder the input EMI filter circuit and usb-C output boards to improve the overall space utilization.
The reference designs are input filter circuits, PFC boost inductors, high voltage filter capacitors, flyback transformers, and output filter capacitors from left to right, with a clear layout.
On the back from left to right are synchronous rectifier, flyback controller and gallium nitride power chip, silicon carbide diode, PFC switch tube and PFC controller. On the far right is the fairing bridge, and there is another one on the front, using two to spread the heat equally.
The length of the power supply reference design measured using a vernier caliper is 65.38mm.
The width is 48.54mm.
The height is 25mm, and the power density is 1.51W/cm according to the measured size.
Compared with Apple's 140W Gallium Nitride power supply, it is about 1/2 volume of Apple.
The measured weight is about 113.6g.
Second, Biyi micro 120W gallium nitride fast charging source reference design analysis
Through the above size measurement and size comparison, we have a general understanding of this 120W power supply scheme. The use of flyback in the 120W power band can effectively simplify charger design and reduce overall cost, and further accelerate the ecological construction of high-power chargers and power devices.
The input board is welded with fuses, X capacitors, common mode inductors and other devices to make full use of space. The left side also reserves the position of the folding pin for portable charger design.
PFC boost inductor, left side is the filter film capacitor, right side is the PFC output filter capacitor, from Yongming, KCX series, withstand voltage 400V, capacity 27μF, four in parallel.
Flyback transformer close-up, using insulating tape winding, transformer secondary uses Leeds wire, reduce high frequency losses.
The output filter capacitor adopts two Yongming NPX series solid capacitors, with a withstand voltage of 25V, 820μF capacity, and two in parallel.
The input end adopts two rectifier bridges to divide the heat equally, the rectifier bridge is from Wold, model WRLSB80M, rated current 8A, withstand voltage 1000V.
The PFC boost controller is from B&We, model KP2801, operates in critical mode, supports single-winding inductors, and does not require auxiliary windings. The chip has a built-in high-voltage start circuit, and the start-up time is less than 0.2 seconds.
The KP2801 has integrated degaussing signal detection technology, eliminating the need for auxiliary windings for degaussing detection, reducing system costs. Comprehensive protection features are integrated internally to ensure stable uptime, and the SOP-8 package reduces footprint for small, compact power applications.
The PFC rectifier tube adopts Chuangneng Power ACD06PS065N, which is a 650V, 6A silicon carbide diode with a DFN5*6 package.
The PFC switch tubes are Infineon IPL60R185P7, CoolMOS P7 series, withstand voltage 650V, conductivity resistance 185mΩ.
Flyback controller from Biyiwei, model KP2202, is a highly integrated flyback controller, integrated high voltage start and X capacitor discharge function, operating frequency up to 500kHz, support 10-112V power supply range.
The KP2202 has 500kHz, 300kHz and 140kHz three-stop operating frequency adjustable, integrated input overvoltage protection and undervoltage protection, integrated jitter function to optimize EMI performance, the chip supports green power saving mode and hiccup mode operation, reduce standby power consumption.
The KP2202 also integrates comprehensive protection functions, including overvoltage/undervoltage protection, output overvoltage protection, input overvoltage/undervoltage protection, on-chip and external overtemperature protection, cycle-by-cycle current limiting, and other protection functions.
Gallium nitride power chip adopts nano-micro NV6125, which is a gallium nitride power chip with integrated gallium nitride driver and gallium nitride switch tube, using a 6*8mm heat dissipation enhanced QFN package, built-in 650V withstand voltage, 175mΩ conductive resistance gallium nitride switch tube, transient withstand voltage up to 800V.
Two SMD Y capacitors are from Terry.
The synchronous rectifier controller is KP4060 and is available in SOT23-6 packages to save space. The KP4060 supports a 600kHz switching frequency for KP2202 500kHz high frequency switching applications.
KP4060 supports DCM, BCM, CCM, QR operating mode and active clamp Flyback topology, supports 600kHz operating frequency, integrated high voltage detection circuit and high voltage power supply circuit, integrated intelligent dual LDO, no auxiliary winding power supply, support output short circuit SR operation.
The KP4060 supports a wide range of output voltage applications (0 to 20V), especially suitable for fast charging applications that support QC, PD and other protocols. And supports high-side or low-side configurations.
Synchronous rectifier tube from Jiejiewei, model JMSH1207AG, withstand voltage 120V, conductivity 5.6mΩ, using DFN5*6 package.
The USB-C protocol chip adopts Huinengtai HUSB350, which is CERTIFIED by USB PD3.0 and PPS for output voltage control.
The PC817 optocoupler is used for output voltage feedback.
Biyiwei has launched a variety of complete gallium nitride fast charging solutions, including KP2801 PFC controller for high-power applications, KP2206/2202 for direct drive gallium nitride switch tubes, KP22064/22066 for gallium nitride chips and KP4060 high-frequency synchronous rectifier controllers.
Charging head net summary
The 120W Gallium Nitride fast charging scheme of Biyiwei uses KP2801 PFC controller, KP2202 QR flyback controller and KP4060 synchronous rectifier controller. The flyback topology allows for wide voltage outputs, making it more flexible than LLC solutions, eliminating the need for secondary buck circuitry, reducing costs and improving price/performance.
The controller of this fast charging solution is all provided by Biyi Micro, which has achieved the success of the full localization of high-power gallium nitride fast charging by domestic manufacturers. Compared with the LLC+ secondary buck scheme, the flyback topology is not only close in performance, but also has significant cost advantages, and is a strong competitor for efficient gallium nitride power supply.
Related Reading:
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2. Introduction of Biyi gallium micronitride fast filling and sealing scheme KP22066 and KP22064
3. Biyi micro launched a variety of gallium nitride fast charging solutions
4. Biyi Micro launched KP2801 quasi-resonant boost PFC controller
5. Biyi micro 45-65W fast charging scheme application case summary