Teardown report: Lenovo 140W USB-C power adapter ADL140YAC3A
前言
Charging Head Network 购买了联想 140W 电源适配器。本电源适配器采用梅花接口输入，可更换不同长度的电源线。适配器自带一根 1.8 米长的输出线，是一个 USB-C 接口。该适配器支持联想专有的20V7A 140W快充，可以满足联想笔记本电脑的供电需求，也可以为其他品牌的电脑和手机充电。
该电源适配器由康数制造，与笔记本电脑一起使用。电源适配器体积较大，更适合在家中或公司固定场所使用。下面，充电头网络就来拆解一下这个电源，看看内部的材料和做工。
联想140W USB-C电源适配器外观
联想的 140W USB -C 电源适配器在外观上与旧款笔记本适配器没有什么不同。它方形纤细，具有集成的延长充电线，输入端具有单独的线缆设计。
机身由PC阻燃材料制成，具有磨砂表面和圆润边缘。联想品牌和 140W 字样设计在顶角 .
There is a sticker with inscriptions on the product specifications in the concave area on the back.
Close-up of adapter parameters
Model: ADL140YAC3A
Input: 100-240V~50/60Hz 2.3A
Output: 5V3A, 9V3A, 15V3A, 20V7A
Manufacturer: Kangshu Technology Co., Ltd.
Judging from the nameplate, the adapter has passed Level VI energy efficiency certification.
The input interface is a national standard 3-hole plum blossom port. The nickel-plated copper material has stronger conductivity, wear resistance and no deformation.
The output port has a recessed design and is stored parallel to the side, allowing it to stand upright on the desktop. The wire and body are made using in-mold injection molding and are inseparable for greater stability.
The terminal of the integrated extension cable is a USB Type-C physical port, which is compatible with mainstream charging ports on the market. The housing of the terminal is printed with a concave design to make it easier to bear force.
The Type-C port rubber core is yellow and has a special PIN pin design inside.
The adapter body length is approximately 122.02mm.
The adapter body width is approximately 62.08mm.
The thickness of the adapter body is approximately 27.02mm.
The length of the integrated output cable is approximately 180cm.
The overall weight is approximately 323g.
Compared with Apple’s 140W charger, it is more slender.
Using the POWER-Z KM003C tester, it was measured that the Type-C port of the integrated output cable supports charging protocols such as PD3.0, PPS, QC5 and DCP.
In terms of measured PDO messages, the Type-C port has four fixed voltage levels of 5V3A, 9V3A, 15V3A and 20V7A, and two PPS voltage levels of 5-11V3A and 5-21V3A.
Lenovo 140W USB-C power adapter disassembly
After reading the size, weight, and output test of Lenovo’s power adapter, let’s dismantle this power supply to see the internal design and materials.
First disassemble the casing along the seam of the power input end.
Welding of cold-pressed terminals for power input lines.
The power output wires are red, black and blue.
Take out the internal PCBA module and wrap it with aluminum sheets for heat dissipation.
The heat dissipation aluminum sheet is fixed to the back of the PCBA module by welding.
The length of the PCBA module measured using a vernier caliper is approximately 112.5mm.
PCBA module width is approximately 55.75mm.
PCBA module thickness is approximately 21.55mm.
The heat sink is fixed with buckles.
Remove the heat sink covered by the PCBA module. The PFC boost inductor and transformer are pasted with glue for heat conduction. Glue is applied between the components for reinforcement. Mylar sheets are used for insulation between the PCBA module and the heat sink.
An overview of the front of the PCBA module. The upper left corner is the input terminal, soldered fuse, common mode inductor, and safety X2 capacitor. A heat sink is fixed on the lower left side to dissipate heat for the rectifier bridge. Weld the PFC boost inductor on the top, weld the high-voltage filter capacitor, resonant capacitor and transformer on the right, and weld the filter capacitor and output line on the right.
At a glance on the back of the PCBA module, weld the PFC controller, PFC switch tube, and rectifier tube, and on the right side weld the HFB hybrid flyback controller and switch tube. On the right side is the secondary, where the synchronous rectification controller, synchronous rectifier tube and protocol chip are welded. Two feedback optocouplers are welded between the primary and secondary.
Through observation of the PCBA module, we found that Lenovo’s 140W power adapter adopts a PFC+HFB half-bridge architecture design. The PFC circuit boosts the input voltage to power the HFB half-bridge circuit, and outputs it through synchronous rectification. The output voltage is controlled and adjusted by the protocol chip to perform wide-range output. At the same time, the protocol chip also performs PFC control. Let’s start with the input end to understand the design and materials of the entire adapter.
Overview of the input terminals, soldering fuses, common mode inductors and safety X2 capacitors.
The input fuse is from CONQUER, MST series ultra-small time delay fuse, specification is 3.15A 250V, used for input overcurrent protection.
The common mode inductor is wound with enameled wire and insulated wire, and the bottom is insulated with bakelite board.
A close-up of another common mode inductor.
The safety X2 capacitor comes from Yimanfeng Technology, and the specification is 0.33μF.
The common mode inductor is wound with flat copper wire, and the insulating bracket is welded to the bottom.
The heat sink is welded and fixed on one side of the PCBA module.
The two rectifier bridges are from PY Pingwei, model GBP410, and the specification is 4A 1000V. The rectifier bridge is a half-bridge connection, which distributes heat evenly, and is fixed on the heat sink with thermal conductive glue.
Two film capacitors are used for output filtering, with a specification of 1μF 450V.
The filter inductor is made of magnetic surround, and the bottom is insulated with bakelite board.
PFC controller silk screen 3CCRSO, from ON Semiconductor, model NCP1622, uses innovative frequency foldback control to improve energy efficiency at nominal load and low load. The chip is packaged in TSOP6 and has comprehensive protection functions.
The PFC switch tube is from Infineon, model IPD60R180P7S, which is CoolMOS P7 series, with a voltage resistance of 650V and a conductance resistance of 145mΩ. It is packaged in PG-TO252-3 and connected in parallel.
At a glance from the side of the PCBA module, the PFC boost inductor, high voltage filter capacitor, resonant capacitor and output filter capacitor are welded from right to left. The ground wire is insulated with heat shrink tubing and connected to the secondary.
The PFC boost inductor is tightly wrapped with tape for insulation.
Silk screen ES5J fast recovery diodes are used for PFC rectification.
Silk screen GS5M diodes are used for PFC bypass.
A close-up of a chip inductor.
The high voltage filter capacitors are from Aihua.
Specifications are 450V 120μF.
The HFB controller comes from Infineon, model XPDS2201. It is a digital hybrid flyback controller that integrates a 600V high-voltage startup circuit and high- and low-side MOS drivers. Peak current mode control is used for fast load response. Automatically switches to burst mode operation based on the output current level, supports primary side overvoltage protection, standby power consumption is <75mW, parameters can be configured through a single-pin UART interface, and is packaged in PG-DSO-14, with streamlined peripheral components.
The half-bridge switch tube is Silan Micro SVSP11N70DD2TR, NMOS, with a voltage resistance of 700V, a conductance resistance of 370mΩ, and a TO252 package.
The other switch tube has the same model.
The resonant capacitor in series with the transformer has a specification of 0.68μF.
The filter capacitor that supplies power to the main control chip comes from Aihua, with a specification of 100V10μF.
The other specification is 35V47μF.
Switching transformer close-up.
The blue Y capacitor is from SEC Success Industries.
Two 1008 optocouplers are used for output voltage feedback and LLC control.
The synchronous rectification controller comes from MPS, silk screen IBUJN, the actual model is MP6951, which is the latest synchronous rectification controller launched by MPS. It supports DCM, CCM, QR, ZVS working modes, and also supports ACF active clamp flyback and HFB hybrid flyback. Excitation, the operating frequency can reach 1MHz, supports driving GaN synchronous rectifiers, supports high-side and low-side applications, and is packaged in TSOT23-6.
The synchronous rectifier is from Toshiba, model TPH4R50ANH, NMOS, withstand voltage 100V and conduction resistance 3.7mΩ.
Four solid capacitors are soldered to the output end.
The solid capacitors are from ELITE Jinshan and are UPD series ultra-low ESR polymer solid capacitors with a specification of 470μF 25V.
An electrolytic capacitor comes from ELITE Jinshan, with a specification of 680μF 25V.
The protocol chip is from Angbao, model OB2623, supports PD3.1 fast charging, supports 28V output voltage and 140W output power. The chip has a built-in MCU and supports protocol customization. The chip integrates VBUS control and Vconn power supply. The chip integrates the CV/CC loop and voltage and current DAC. It supports 10mV and 10mA precision voltage and current adjustment. The chip integrates complete protection functions and is packaged in QFN16.
The VBUS switch tube is from Infineon, model BSZ0902NS. It is an NMOS with a voltage resistance of 30V, a conduction resistance of 2.6mΩ, and a TSDSON-8 FL package.
A square rubber pad is also pasted on the back of the PCBA module to provide support.
Take a look at all the disassembly and take a family photo.
Summary of disassembly of charging head network
Lenovo’s 140W power adapter is designed with a replaceable power cord. The power cord can be replaced with different lengths according to different use occasions, making it convenient to use. The adapter comes with a 1.8-meter-long USB-C output cable and supports Lenovo’s proprietary 20V7A fast charging protocol, which can meet the power supply needs of Lenovo laptops and can also charge laptops of other brands. According to the actual test, this adapter also supports PPS fast charging and has good compatibility with Android mobile phone fast charging.
Charging Head Network learned through disassembly that Lenovo’s power adapter uses PFC+HFB topology, the PFC controller uses ON Semiconductor NCP1622, paired with Infineon IPD60R180P7S, and the HFB half bridge uses Infineon XDPS2201 paired with Silan Micro SVSP11N70DD2TR. The synchronous rectification controller uses MPS MP6951 with Toshiba TPH4R50ANH, and the protocol chip uses Angbao OB2623.
The adapter uses Aihua high-voltage capacitors and Jinshan solid-state capacitors inside. The PCBA module is covered with aluminum heat sinks and insulated with Mylar sheets. The rectifier bridge is equipped with heat sinks, and the heating elements are filled with glue to enhance heat conduction. The internal heat dissipation performance of the adapter is optimized for laptop charging and high-power scenarios to reduce the temperature rise of long-term output at full load.
