As the charging interface of notebook computers is gradually unified to usb-c, the market demand for medium power USB PD fast charging chargers has increased significantly, especially in the power range of 65W, which is used by most light and thin notebook computers.Recently, Lenovo, an old computer manufacturer, launched a yoga 65W USB PD fast charging charger with two colors of red and white. As a laptop accessory, this product focuses on small, portable, multi device compatible selling points, which is very suitable for travelers.
The charging head network has disassembled this charger in detail in the near future. Here is to share its internal structure and material workmanship.
1、 Lenovo Yoga 65W charger appearance
The design of the packing box is simple, and the appearance of the charger is printed in the center.
The packing box adopts the design of heaven and earth cover, and the parameter information of the product is printed on the bottom.
Open the box and place the charger in the groove for fixed protection.
The package includes charger, 100W CC fast charging data line and operation manual.
The data line shall be bundled with white magic ties, and the surface of the line body shall be smooth without burr.
The plastic shell of the data line head adopts the bright surface baking paint processing technology, and the junction of the line body and the line head adopts the bending resistance processing.
The use of chargerlab power-z km001c shows that the cable is equipped with e-marker chip, with power transmission capacity of 20V / 5A and data transmission capacity of USB 2.0.
Lenovo's 65W fast charging charger is simple in overall white design. The surface of the body shell is made of bright baking paint. It is smooth and white, and the logo of Yoga brand is printed on the body.
Each side of the charger body is a smooth arc transition, which feels very mellow.
The input terminal is equipped with foldable national standard pins, which are easy to put in and out, easy to carry, and will not scratch other electronic products.
Product parameter information is marked on the input end shell, model: yg65; input: 100-240V ~ 50 / 60Hz 1.8A; output: 5V / 3a, 9V / 3a, 12V / 3a, 15V / 3a, 20v3.25a; manufacturer: Dongguan Jiner Electronic Technology Co., Ltd.; product charger has passed 3C certification and VI energy efficiency certification.
The output top surface is equipped with a usb-c output interface, and the white rubber core does not expose copper.
The volume of this chargerApple30W charger (middle) is equivalent, much smaller than apple 61W charger, and its volume advantage is still obvious.
The charger is a little thicker than the diameter of a dollar coin.
Use chargerlab power-z kt001 to detect the output protocol of usb-c port, which shows that it supports apple 2.4a, Samsung 5V / 2a, usb-dcp protocol, qc2.0 / 3.0 and huawei-fcp fast charging protocol.
In addition, its PDO message shows that the usb-c interface also supports the USB pd3.0 fast charging standard, with five groups of fixed voltage gears: 5V / 3a, 9V / 3a, 12V / 3a, 15V / 3a and 20V / 3a.
2、 Disassembly of Lenovo Yoga 65W charger
The input end shell is disassembled by force, and the main body shell is connected by ultrasonic welding process, and the pins are sealed and fixed by screws and white plastic plates.
Fold the internal view of the pin, and the pin contacts the PCB board through two metal shrapnels.
Take out the internal board, the PCB side is surrounded by a circle of metal fins, and glue is injected between the transformer and the metal fins to fix and help heat conduction.
A black plastic sheet is arranged between the bottom metal heat sink and the PCB board for insulation and isolation.
Remove all the metal heat sink, the transformer, solid-state capacitor, electrolytic capacitor and other components have been glued and reinforced, and there is a black insulating board between the electrolytic capacitor and the common mode inductance for isolation.
PCB front-end list, with safety x capacitor, safety resistor and PWM main control chip power supply capacitor.
Close up of safety gauge x capacitance, capacity 0.47 μ F.
PWM main control chip power supply capacitor, specification is 50V 3.3 μ F, Danyang farad FZE series.
Next to it is a safety resistor with a heat shrinkable tube.
At the side of PCB, the electrolytic capacitor is pasted with yellow tape, and the common mode inductor is glued and fixed.
The volume of primary filter electrolytic capacitor is very large, the specification is 400V 100 μ F, Danyang farad FZE series, 105 ℃ high temperature, rated life 2000h.
Introduction of Danyang farad FZE series electrolytic capacitors.
Close up of common mode inductance, used to Filter EMI interference.
Another close-up of small electrolytic capacitor, specification 100V 10 μ F, Danyang farad FPH series, 105 ℃ high temperature, rated life 2000h.
Introduction of Danyang farad FPH series electrolytic capacitors.
The other side of the board is welded with a transformer.
The transformer is wrapped with insulating tape and the information is printed on the top.
Output terminal list, welded with solid-state capacitor and filter inductor; usb-c interface is vertically welded on the main control PCB with protocol small board.
Anbo ob2613 provides a wide range of VDD working voltage range, which enables customers to use traditional transformer design and avoid using LDO voltage stabilizing circuit to supply power to PWM chip. At the same time, its unique loop adaptive technology can fully meet the requirements of wide range changes in the output of USB PD applications. With strong technical strength and brand advantages, the ob2613 program has beenDELL, Lenovo and other first-line large-scale plants achieve mass production.
Output VBUS tube of usb-c interface, model zm075p03m, PMOS, withstand voltage 30V, from Shenzhen zhenmaojia Semiconductor Co., Ltd.
Details of zhenmaojia semiconductor zm075p03m.
Close up of usb-c interface base, through hole welding.
Close up of output filter solid state capacitance, 25V 680 μ F, Wanyu ULR series.
Filter inductor close-up, glue to fix.
Close up of two Y capacitors, one of which is covered with insulated plastic pipe.
At the back of PCB.
Input tmbf310 rectifier bridge.
The primary master switch MOS is from Dongwei semiconductor, model osg65r125jf. It adopts advanced green MOS technology, 125m Ω ultra-low resistance, low gate charge, fast switch and excellent avalanche characteristics. Pdfn8x8 package, lower thermal resistance, in addition to the chip location through the hole exposed copper and tin, strengthen heat dissipation.
Detailed specifications of osg65r125jf of Dongwei.
The PWM main control chip adopts Anbo ob2638, which is a highly integrated quasi resonant (QR) controller with adaptive multi-mode regulation function. It is optimized for the usb-pd adapter solution with high performance, low standby power consumption and wide output voltage range, and is used together with the usb-pd secondary controller (such as ob2613). The controller integrates a 105v low differential voltage regulator (LDO), which is compatible with off-line flyback converter applications and covers a wide range of output.
Ob2638 detailed specifications.
1008 optocoupler, across the primary and secondary, is used for primary secondary communication, regulating the feedback output voltage.
MPs core semiconductor mp6908 is used for secondary synchronous rectification control.
Mp6908 detailed specification parameters.
The secondary synchronous rectifier MOS uses Infineon's bsc077n12ns3 g, NMOS, with a withstand voltage of 120V.
Infineon bsc077n12ns3 g data information.
All disassembled, a family photo.
Disassembly summary of charging head network
According to the disassembly of the charging head network, the AC-DC step-down part of the charger is composed of the primary PWM chip Ombo ob2638 with Dongwei high performance MOS, and the synchronous rectifier controller mp6908 with Infineon MOS; the Ombo fast charging protocol chip ob2613 and the true maojia semiconductor VBUS switch tube are used; the built-in Danyang farad electrolytic capacitor and Wanyu solid-state capacitor filter are used for the industry World famous brand.
In addition to the materials, the charger is also in place, the layout of components is compact and orderly. PCBA module uses glue injection and a large area of metal heat sink for heat dissipation to ensure the heat dissipation performance under high power density.