After years of development, gallium nitride fast charging has developed from 65W single port to 100W multiple output ports, the output power continues to increase at the same time, the interface is also more and more, can be charged for mobile phones and notebooks at the same time. However, the 100W charger, the output power is really limited, can only be a single notebook fast charge, restricting the use experience.
Kenji Electronics has launched a gallium nitride fast charging source solution with an output power of 200W and three USB-C output ports. By using MPS's HR1211 controller solution, with four GaN Systems gallium nitride switch tubes, and Tyco Tianrun silicon carbide diodes, a high-power LLC switching power supply is formed, and the MPS synchronous buck controller is used with the cultivation source CY2332 protocol chip for independent interface output control.
The 200W gallium nitride fast charging scheme launched by Yanji Electronics can output 100W from any single port, and the power is intelligently distributed when the multi-port output is not required, and there is no need for an external microcontroller for power distribution, and the circuit is more concise. Thanks to the use of high-performance PFC+LLC power supply schemes and the use of gallium nitride switch tubes, the size of the power supply scheme is only 95*22*55mm, the solution weight is 150 grams, and the board-side power density reaches 1.74W/cm.
First, the appearance of Yanji Electronics 200W Gallium Nitride Fast Charging Scheme
Yanji Electronics 200W Gallium Nitride Fast Charging Scheme adopts PFC+LLC architecture, outputs fixed DC power, and is equipped with three independent synchronous rectifiers and protocol chips to achieve any interface 100W output.
The power supply scheme adopts the welding method of five small boards and a combination of one large board, the input side of the small board is welded with EMI filter circuit, the right side of the board is HR1211 two-in-one controller, and the lower left board is an independent buck output.
On the back are the PFC boost circuit, the secondary synchronous rectifier circuit, and two input rectifier bridges.
On the side of the power supply are electrolytic capacitors, PFC boost inductors, filter inductors, and input EMI filtering boards.
On the output side are three identical buck protocol boards, filtering solid capacitors, and transformers.
Side small board welded MPS HR1211 PFC+LLC controller.
Output on the board soldered MPS MP9928 synchronous rectifier buck controller and cultivator CY2332 protocol chip.
The length of the power supply measured using a vernier caliper is approximately 95mm.
The width is about 55mm.
The thickness is about 22mm.
The measured weight was 150.7g.
The layout of the front components of the power supply is reasonable and compact, and the power supply path is clearly organized. Slots are slotted between primary circuits for placing isolation plates.
Compared with Apple's 140W gallium nitride power supply volume, Kenji's 200W power supply scheme is more slender.
Second, the analysis of Yanji Electronics 200W Gallium Nitride fast charging scheme
Kenji Electronics 200W Gallium Nitride Fast Charging Scheme uses MPS HR1211 for PFC and LLC control, of which the PFC built into HR1211 supports CCM mode, using silicon carbide diodes to reduce the loss caused by reverse recovery. GaN Systems' Gallium Nitride switch tubes are used at both the PFC and LLC levels, significantly increasing the switching frequency of the power supply and thus reducing the size.
Two rectifier bridges are used at the input of the power supply, and the half-bridging method distributes the heat and reduces the local temperature rise.
The switching power supply primary uses the MPS HR1211 controller, which integrates a multi-mode PFC controller and an LLC controller. The PFC controller supports CCM operation mode under heavy load and DCM mode under light load, and the LLC stage adopts current mode control to achieve high stability and fast response of the power supply.
The HR1211 adopts digital loop control, flexible configuration of chip parameters, and supports password-protected encryption, which has broad applicability and enhanced security.
The PFC boost switch tube adopts GaN Systems GS-065-011-1-L, screen printed GS6511-1L. This is a 650V withstand voltage Gallium Nitride device with a conductivity of 150mΩ in a DFN5*6 package. Two capsules are used in parallel here to distribute the heat and reduce the temperature rise.
PFC boost silicon carbide diode adopts Tyco Tianrun G5S06506QT silicon carbide diode, withstand voltage 650V, adopt DFN8*8 package, the maximum operating temperature is 150 °C.
Diodes for PFC bypass that charge electrolytic capacitors at power-up.
The LLC switch is the same model as the PFC switch, both GaN Systems GS-065-011-1-L.
The secondary synchronous rectification controller adopts MPS MP6925, supports dual LLC synchronous rectification, has stronger anti-interference ability and fast shutdown function, and supports CCM and DCM working modes.
The synchronous rectifier tube adopts Hengtaike GN053N06SL NMOS, withstand voltage 60V, conductivity 5.3mΩ, and adopts DFN5*6 package. Use two for LLC synchronous rectification.
Optocouplers are from CT Micro, CT1019, for output voltage feedback.
The output filter capacitor uses two 820μF 25V solid capacitors in parallel.
The output adopts the MPS MP9928 synchronous rectifier controller, and the USB PD wide voltage output is controlled by the protocol chip.
The protocol chip adopts the cultivation source CY2332, which is a controller for USB-C interface, with GPIO pins, which can be configured for multi-chip communication, and can realize multi-port output automatic power reduction without external microcontroller.
Output VBUS switch, Infineon BSC0703LS, withstand voltage 60V, conductivity 6.5mΩ, available in DFN5*6 package.
The USB-C female seat is soldered through holes and is very reliable.
Charging head net summary
The 200W Gallium Nitride fast charging solution launched by Kenji Electronics uses a highly integrated MPS power supply master control with GaN Systems Gallium nitride switch tube. Through high-performance power architectures and the application of third-generation semiconductor devices, the power supply volume is greatly reduced. At the same time, the protocol scheme with high integration does not require the collaborative use of single-chip microcomputer to avoid the problem of long and short materials.
Yanji Electronics is customer-centric, providing professional power supply solutions and one-stop material supply. Yanji Electronics has strong R&D capabilities, which can greatly shorten the research and development cycle of power supply products and seize the opportunity.