Preface
Charging head network got the original 100W gallium nitride power adapter of Lenovo's new laptop, this adapter is designed with its own cable, and the length of the output cable is about 1.8 meters. The charger supports 100-240Vac wide voltage input, supports 20V5A PD fast charging, and also supports 5-21V3A PPS fast charging, which also has good compatibility for mobile phone charging.
This power adapter is manufactured by Delta and has three-pin national standard pins, which not only has a grounding function, but also makes the metal shell of the computer more secure and not easy to fall. The following brings a dismantling of Lenovo's original 100W gallium nitride power adapter, and let's take a look at the internal scheme and materials.
Lenovo original 100W gallium nitride power adapter appearance
Lenovo's original 100W GaN power adapter is a classic black color scheme, as the standard power adapter of Lenovo's notebook, thanks to the use of gallium nitride technology, the overall design of the fuselage is very small.
The adapter is made of PC flame retardant plastic shell, the main body is frosted and anti-fingerprint, the height and width of the machine are the same, and the front view is square.
The front of the fuselage is designed with the Lenovo brand.
The 100W inscription is designed on the opposite corner, so users can intuitively understand the maximum output power of this power adapter.
The power adapter is equipped with three-pin pins and can be grounded, which effectively prevents users from being electrocuted and improves the charging experience.
The input housing is printed with the power adapter parameter information.
Close-up of the nameplate parameters of the power adapter
型号:ADL100UDGC3A
Internal model: GX21M04624
零售型号:5A11M04632
输入：100-240V~1.6A 50/60Hz
输出:5v3a、9v3a、15v3a、20v5a 100v
Manufacturer: Delta Electronics Industry Co., Ltd
The adapters are CCC certified, as well as certified for energy efficiency level VI.
The connection between the output cable and the fuselage is designed with groove protection.
The USB-C terminal shell is matte, and the front and back and sides are designed with classic small concave surfaces and raised teeth respectively for easy plugging and unplugging.
The width and height of the measured power adapter are about 62.4mm.
The body thickness is 32.27mm.
USB-C线长度约为178.3mm。
Feel the size of the power adapter in your hand.
In addition, the weight of the product was measured to be about 234g.
The USB-C output of the power adapter measured with the ChargerLAB POWER-Z KM003C supports PD3.0, PPS, QC5, and DCP charging protocols.
PDO packets show that it also has four sets of fixed voltage ranges of 5V3A, 9V3A, 15V3A, and 20V5A, and two sets of PPS voltage ranges of 5-11V3A and 5-21V3A.
Lenovo original 100W GaN power adapter disassembled
After reading the appearance and test of Lenovo's gallium nitride power adapter, let's disassemble it and take a look at the internal scheme and materials.
First, disassemble the adapter input and output side housings.
The power input cable is connected by wire welding.
The output is also connected by wire welding.
Cut the connecting wire and take out the PCBA module, and the PCBA module is wrapped with aluminum sheet for heat dissipation.
The length of the PCBA module measured by vernier calipers is about 57.7mm.
The width of the PCBA module is about 58mm.
The thickness of the PCBA module is about 27.8mm.
The side of the PCBA module is fixed by a snap.
The heat sink is riveted and soldered to the PCBA module.
Close-up of heat sink solder joints.
Remove the heat sink wrapped by the PCBA module, glue the front and back of the PCBA module to strengthen heat dissipation, and provide Mylar sheet insulation between the heat sink and the PCBA module.
The front of the PCBA module is at a glance, with a fuse on the left side, a safety X2 capacitor, and a common mode inductance. A small board is soldered on top for the rectifier bridge and PFC circuit. The lower side is a PFC boost inductor, and the right side is equipped with an output filter capacitor. The lower right corner is welded transformer, and the left side is a high-voltage filter capacitor.
The back of the PCBA module is welded with a hybrid flyback controller and two switch tubes, and the lower right corner is welded with a feedback optocoupler, a synchronous rectifier controller, a synchronous rectifier tube and a protocol chip.
Through the observation of the PCBA module, it is found that the Lenovo 100W GaN power adapter adopts the PFC+HFB hybrid flyback switching power supply architecture, and the output voltage is fed back by the protocol chip through the optocoupler to achieve wide voltage output, and the GaN switch is used in the PFC stage. Let's take a look at the design and materials of the entire adapter from the input.
Input welded fuse, safety X2 capacitor and common mode inductor.
The input fuse is from CONQUER, MST series ultra-small time delay fuse, specification is 3.15A 250V, and is used for input overcurrent protection.
The safety X2 capacitor is from SCC Real Electronics, and the specification is 0.33μF.
The common mode inductor is wound with enameled wire and insulated wire, and the bottom is welded with an insulating bracket and insulated with tape.
The other common-mode inductor is wound with enameled wire and an insulating bracket welded to the bottom.
Side small plate welded rectifier bridge, PFC controller, PFC switch tube and PFC rectifier tube. The corresponding switch tube and rectifier tube position is equipped with copper sheet and thermal pad to strengthen heat dissipation.
Solder and remove the side plates and heat dissipation copper sheets.
The PFC controller is welded on the left side of the small plate, the PFC switch tube is welded on the upper middle, the rectifier tube is on the bottom, and there are two rectifier bridges on the right side.
There are no soldering elements on the back of the small plate.
The two rectifier bridges are modeled MB30KH, with a specification of 3A1000V, and the half-bridge connection is evenly divided with heat.
The size of a thin film filter capacitor is 0.68μF.
The other thin-film filter capacitor is 1μF.
The filter inductor is made of magnetic surrounding, and the bottom is welded with an insulating bracket.
The PFC controller is from onsemi, model NCP1623, and is based on the innovative Valley Synchronous Frequency Foldback (VSFF) method. The VSFF maximizes efficiency at both nominal and light loads, operates in critical mode at heavy loads, operates in intermittent conduction mode at light loads, and supports valley turn-on for increased efficiency.
NCP1623 supports critical-mode, intermittent-on-mode operation, valley synchronous frequency foldback improves efficiency at nominal and light loads, and provides good power factor at low switching frequencies.
The PFC switch adopts gallium future G1N65R150PB-H, which is a gallium nitride power device with a withstand voltage of 650V, a transient withstand voltage of 800V, a nominal conduction resistance of 150mΩ, and a gate withstand voltage of ± 20V.
The Gallium Future G1N65R150PB-H is available in a PQFN8x8 package with a thermal pad as the source to reduce the high-frequency trace area and help optimize EMI performance.
Gallium Future G1N65R150PB-H Fact Sheet.
Through the dismantling of the charging head network, it was learned that the GaN future GaN power device has previously been replaced by DJI 100W dual USB-C port GaN desktop charger, Bull 240W 3C1A GaN desktop charger, Anker PowerHouse 767 - 2048Wh | 2300W GaN outdoor power station, Lenovo Legion 140W PD3.1 GaN fast charger and other products.
The PFC step-up inductor core is shielded with copper foil and insulated with adhesive tape.
The PFC rectifier is a STTH10LCD06 ultra-fast recovery diode from STMicroelectronics in a 10A 600V package in a DPAK package.
The side of the PCBA module is welded with high-voltage filter capacitors and transformers.
The high-voltage filter capacitor is from Chemi-Con and is specified at 450 V 82 μF.
The HFB controller from Infineon, model XPDS2201, is a digital hybrid flyback controller with integrated 600V high-voltage start-up circuitry and high- and low-side MOS drives. Peak-current mode control for fast load response. It automatically switches to burst mode operation based on output current level, supports primary-side overvoltage protection, < 75mW standby power consumption, and can be configured through a single-pin UART interface, and is available in a PG-DSO-14 package with reduced peripheral components.
The filter capacitor that supplies power to the main control chip comes from Aihua, and the specification is 35V47μF.
The switch is from Infineon, model IPL60R185C7, NMOS, withstand voltage 650V, conduction resistance 185mΩ, and is available in a ThinPAK8*8 package.
The HFB top tube from STMicroelectronics, model number STD13N60M2, NMOS, withstand voltage 650V, conduction resistance 380mΩ, is available in a DPAK package.
Side-welded switching transformer and output filter capacitor.
The switch transformer core is tightly wound with tape insulation.
Close-up of blue Y capacitor.
LITE-ON LTV1004 optocouplers are used for output voltage feedback regulation.
The synchronous rectifier controller comes from MPS Xinyuan Semiconductor, silkscreen IBUJR, the actual model is MP6951, supports DCM, CCM, QR, ZVS working modes, and also supports ACF active clamp flyback and HFB hybrid flyback, the working frequency can reach 1MHz, supports driving gallium nitride synchronous rectifier tubes, supports high-side and low-side applications, and adopts TSOT23-6 package.
The synchronous rectifier is from Infineon, model BSC040N10NS5, NMOS, withstand voltage 100V, conduction resistance 4mΩ, and is available in a PG-TDSON-8 package.
One TVS diode is from Lit, model SMAJ70A, which is used to absorb surge overvoltages.
The output filtered solid-state capacitor specification is 680μF 25V.
The specifications of the filter electrolytic capacitors are the same.
The protocol IC uses the WT6636F of Weiquan, which is a protocol chip that has passed the USB PD3.0 (PPS) certification of the USB-IF Association and has passed the Qualcomm QC4+ certification. WT6636F supports USB PD3.0 and PPS, supports line loss compensation, and supports multiple protection functions. Integrated 10-bit ADC for voltage and current detection, built-in 8051 core microcontroller, built-in discharge MOS tube.
The VBUS switch is from Fuding Advanced, model AP3NA4R2YT, NMOS, withstand voltage 30V, conduction resistance 4.2mΩ, and adopts PMPAK3*3 package.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
Lenovo's 100W gallium nitride power adapter uses national standard three-pin pins, which on the one hand has a grounding function to prevent the laptop with a metal shell from being numb, and it is also more stable to use on the wall plug and is not easy to fall. The adapter comes with a 1.8 meter long output cable, which can meet most use occasions. The tested adapter supports 100W PD fast charging and also supports 21V3A PPS fast charging.
Through the dismantling of the charging head network, it was learned that Lenovo's power adapter uses PFC+HFB architecture, and the PFC controller uses onsemi NCP1623, with gallium future G1N65R150PB-H gallium nitride switch tube. The HFB circuit consists of an Infineon XDPS2201 controller with two MOS transistors.
GaN future depletion-depleted GaN switches support the use of traditional silicon MOS controllers, which have good versatility and compatibility. Transformers and power devices are glued and filled to strengthen thermal conductivity. The adapter PCBA module is wrapped with aluminum sheets to enhance heat dissipation, optimize the heat dissipation performance for notebook charging and high-power continuous output scenarios, and reduce the temperature rise in use.