The charging head network has found the Huawei CloudEngine 16800 series switch power module PAH-3000WA, which adopts a long strip shape and a metal shell, and is designed as a redundant power supply. There is a cooling fan and a handle at the front end of the power module, and a connector at the output end. This module has no external power cable, and the input, output, and communication pins are all connected through the gold finger on the tail, which is clean and tidy.
The power module has 3000W output power and supports both AC and DC inputs. The power output specification is 535v 56.1a, the calculated output power is 3000W, and the output power is reduced according to the decrease of the input voltage, and the output power is derated to 1500W under 110VAC input. Let's bring the disassembly of the PAH-3000WA power module, and take a look at the internal materials and design.
Huawei's 3000W switching power supply PAH-3000WA adopts a metal shell, which is packaged and fixed with screws in the classic splicing method, and positioning slides are provided on both sides. The first impression of a power supply is very long, and at the same time very weighty.
The front end shell of the switching power supply is sprayed with black paint, which is actually also made of metal, and there is a PAH-3000WA model in the lower left corner.
The front housing grille is designed for air circulation.
In the upper left corner, there are inputs, outputs, and warning indicators.
There is also a plastic handle on the front with a yellow-green release button on the inside.
There is a lock on the side of the fuselage, which can be realized by pressing the yellow-green trip button, and the Huawei 3000W switching power supply PAH-3000WA can be taken out.
There is a switching power supply nameplate on the top of the fuselage, and the manufacturer information on the nameplate has been deliberately damaged.
Close-up of the nameplate of the switching power supply.
Model: PAH-3000WA
AC Input: 200-240V; 50/60hz；16a or
DC input: 240-380V; 14a
DC Output: 535v；56.1a max
Total DC output power: 3000W Max
AC Input: 100-130V; 50/60hz；16a
DC Output: 535v；28.1a max
Total DC output power: 1500W Max
The switching power supply has passed CCP, CE, TUV certification.
There are also positioning slides on both sides of the bottom of the fuselage.
The input and output receptacles of the switching power supply are located at the same end, the left side is the DC output socket and the power control socket, and the right side is the power input terminal, and the upper and lower hierarchical structure.
The measured length of Huawei's 3000W switching power supply PAH-3000WA is about 44cm.
The width of the fuselage is about 103cm。
The thickness is about 4cm.
In addition, the weight of the power module is measured to be about 2788g.
After reading the appearance display of Huawei's power module, let's disassemble it and take a look at the internal materials and design.
First, unscrew all the fixing screws on the metal housing and remove the power module panel and cover.
The inside of the cover plate is insulated with black Mylar sheets.
Mylar sheets are also pasted on the sides of the cover plates.
Close-up of the structure of the handle on the front of the power module, and the grille is used for air circulation.
Close-up of the light guide structure of the working indicator.
Close-up of the locking mechanism of the power module with built-in spring return.
The PCBA module is fixed inside the housing by screws.
Take out the PCBA module and insulate it with Mylar sheets inside the housing.
The cooling fan is connected via a connector.
The cooling fan is from Delta, model FFB0412EN-00, and the specification is 12V 21a, made in China.
The front of the PCBA module is at a glance, and the lower left corner is the power input terminal, soldering fuse, varistor, relay, common mode inductor, and safety X2 capacitor. The high-voltage filter capacitor is welded in the lower right corner. The heat sink above the high-voltage filter capacitor is provided with a switch tube and two rectifier bridges. Weld PFC boost inductor, resonant inductor, resonant capacitor small plate, top welded switch tube, PFC switch tube and PFC rectifier tube above the heat sink.
The upper left side is provided with a power main control board, the lower auxiliary power supply board is insulated by a plastic cover, and two auxiliary power supply boards are welded on the right side. The small heat sink in the middle is the synchronous rectifier tube for heat dissipation, and the output filter capacitor and transformer are below. The top of the transformer core is equipped with a thermal pad to strengthen heat dissipation and reduce the temperature rise through the module cover.
The back of the PCBA module is equipped with components such as MCU and VBUS switch tubes, and the primary stage is distinguished by dotted lines.
The input and output terminals of the power module are listed at a glance, the vertical terminals on the left are the positive and negative outputs of the power supply, and the power input terminals are on the right.
Close-up of the power input terminal, which is designed for the upper and lower layers.
Close-up of the fuse at the input end, insulated by a heat-shrinkable tube, and fixed with glue.
Below the fuse is a safety x2 capacitor, from Xiamen Farah Electronics, with a specification of 22μf。
The blue safety Y capacitor is from Huaxinke.
Close-up of three blue Y capacitors at the other end.
Six yellow varistors are used for surge absorption and are insulated with heat shrink tubing.
Varistor model TVR20751R.
Two gas discharge tubes are insulated with heat shrink tubes.
The relay comes from Hongfa, which is HF180F series magnetic latching relay, coil voltage 12V, built-in two sets of normally open + normally closed contacts, and the contact capacity is 25A 290VAC.
The common mode inductor is magnetically surrounded, and the PCB is insulated by a bakelite board.
Close-up of gray safety capacitors.
Close-up of blue Y capacitor.
The other common-mode inductor is also made of magnetic surrounding, and the bottom is insulated with a bakelite board.
Two thermistors are used to suppress inrush currents when the power supply is powered on.
The relay used to switch the thermistor is from Omron, model G2RL-14-E-CF, coil voltage 12V, contact capacity 16A 250V.
The two rectifier bridges are from Leshan Radio, model D25SB80, with a specification of 25A 800V, and two half-bridges are connected to share the heat.
In addition, there is also a rectifier bridge, from Leshan Radio, model GBU15K, specification 15A 800V
The front end of the rectifier bridge is equipped with an NTC thermistor.
The thin film filter capacitor is from Xiamen Farah Electronics, which is the CL21X series and has a specification of 15μf450v。
The power main control MCU chip comes from ST ST, model STM32F334C8T7, the chip has a built-in 32-bit CPU and FPU, the main frequency is up to 72MHz, built-in 64K Flash and 12K SRAM, and supports parity. It also integrates two fast 12-bit ADCs, ultra-fast comparators, etc., and supports 6-channel PWM signal output.
The chip crystal oscillator frequency is 12000mhz。
On the side of the PFC boost inductor, there is a PFC switch and a rectifier tube.
PFC switch is from Toshiba, model TK31N60W, NMOS, withstand voltage 600V, conduction resistance 73M, TO247 package.
The two PFC boost inductors are wound with litz wire.
The PFC rectifier is a 600V30A rectifier from Kyocera and is available in a TO-247-2PIN package.
Close-up of the transformer used to detect PFC-level current, glued and reinforced.
The high-voltage filter capacitors are from EPCOS and are specified at 1000 F450V.
The other high-voltage filter capacitor is from Chemi-Con and is specified at 450V470 F.
An MCU from STMicroelectronics, model STM32F334R8T7, is a mixed-signal MCU with built-in DSP and FPU, with a built-in Cortex-M4 CPU clocked at 72MHz, 64KB Flash, and 16KB SRAM.
Two switches are provided on the heat sink of the PFC switch tube.
The switch is from Toshiba, model TK28N65W5, NMOS, withstand voltage 650V, conduction resistance 110M, and comes in a TO-247 package.
There are also two switch tubes fixed on the heat sink of the rectifier bridge.
The model of the switch tube is also TK28N65W5, and the four models are the same.
Chip current transformers are used for current sensing.
Close-up of resonant inductance, core coding and annotation information. The resonant capacitor board is soldered on the right.
The resonant capacitor adopts MLCC, which is welded to a small vertical board to save space.
The transformer is wound with litz wire, and a thermal pad is pasted on the core and connected to the module cover plate to enhance heat dissipation.
Six synchronous rectifier tubes at the output end are fixed on the heat sink.
The synchronous rectifier tube is from Infineon, model IPP075N15N3, NMOS, withstand voltage 150V, conduction resistance 72M in a PG-TO220-3 package.
The five filter capacitors at the output end are fixed with glue.
The output filter capacitor specification is 63V680 F, for a total of 3400 F.
A 2220 package MLCC is used for output filtering.
The output filter inductor is magnetically surrounded, and the middle and bottom are insulated with bakelite boards.
The output filter capacitor is from Nichicon and is specified at 470 F63V.
Three 1m sampling resistors are used to sense the output current.
The output VBUS switch is from onsemi, model FDMS86150A, NMOS, withstand voltage 100V, conduction resistance 485m in a Power 56 package.
The front of the PCBA module is welded with three Vbus switches of the same model.
1.The 5SMC75CA TVS is used for output surge protection.
Close-up of the DC output socket of the power module.
On the right side of the output socket is the power control socket, a total of 30 pins.
There are a number of small boards on the input and output sides of the PCBA module.
One of the small plates is insulated with a black plastic cover.
Remove the insulating plastic cover, and the inside is an auxiliary power supply board.
Disassemble and remove the three small boards, and use the power main control board on the outside of the PCBA module.
The three small boards are the auxiliary power supply board, the rectifier filter board, and the isolation drive board below.
The front of the rectifier filter board is welded with a common mode inductor, a film capacitor, two resistor jackets for heat shrinkable tubes below, and two electrolytic capacitors on the right side are also jacketed with heat shrinkable tubes.
Eight chip diodes are soldered on the back, and the position corresponding to the electrolytic capacitor is hollowed out to reduce the thickness.
Two SMD common mode inductors silk screen printing LF9H516P.
The capacitance of the film is 00047 f, a total of four.
Two electrolytic capacitors are insulated with heat shrinkable tubes and glued.
The two filter capacitors are from Chemi-Con and are specified at 450V68 F.
The auxiliary power supply board is at a glance, with the high-voltage side on the right side of the dotted line and the low-voltage side on the left, which is designed for two independent power supplies.
The rectifier diode and filter capacitor are welded on the back of the auxiliary power supply board, and a feedback optocoupler is also welded.
The auxiliary power chip from Infineon, model ICE2QR2280G, is a power supply chip with integrated switch tube, built-in 800V CoolMOS tube, and supports 30W output power under 85-265VAC input. The chip has built-in cycle-by-cycle current limit and foldback correction, and supports digital soft-start and active burst mode.
Two 1 resistors are connected in parallel to detect the primary current.
The power transformer is wound with multi-layer insulated wire, and the core is also insulated with tape.
Everlight EL1018 optocoupler is used for output voltage feedback.
The rectifier diode is from STMicroelectronics, silkscreen printed R4S.
Close-up of six MLCC filter capacitors connected in parallel.
One filter capacitor is 47 F80V.
The main control chip of the power supply is STMicroelectronics' UC2843B, which is an industrial-grade chip.
The switch tube adopts onsemi FDMS86200, NMOS, withstand voltage 150V, conduction resistance 18m, and Power56 package.
Transformer jacket with metal shielding shell.
Two auxiliary power supply boards are also provided on the right side of the auxiliary power supply board.
The auxiliary power chip is from Infineon, model ICE2QR2280G.
Close-up of planar transformer core.
The EL3H7 optocoupler is used for output voltage feedback.
Close-up of the isolated drive board with the front side soldering the drive transformer and isolation amplifier.
Two driver chips are soldered on the back.
The PM8834M, a dual low-side driver with 4A output, is available in an MSOP 8L-EP package.
The other drive is of the same model.
Two isolation transformers are used for switch drives.
A power chip silk screen printing 04 = 7a.
Close-up of the buck inductor used together.
The optically isolated amplifier is from Toshiba, model TLP7820, which is suitable for motor current harvesting and inverter voltage and current harvesting.
The other opto-isolating amplifier is of the same model.
SGM8270 dual op amps are used for signal amplification.
The Isolated Driver IC from Infineon, model 2EDS8265H, is a fast dual-channel isolated MOS tube driver IC with enhanced I/O isolation.
Five EL1018 optocouplers are used for communication between primary stages.
Two high-speed CAN transceivers, from NXP, model TJA1051, are soldered to a small vertical board on the side for the power module to communicate with the host.
Two NOVOSENSE NSI8121 dual-channel digital isolators are used for communication isolation.
Two EL1018 optocouplers are used for isolated communication.
The secondary control chip is from HiSilicon Semiconductor, silkscreen SD5000.
Chip external 25000MHz clock crystal oscillator.
Close-up of SMD LED indicator.
A 1 chip resistor is soldered on the left side of the chip.
The external memory is from STMicroelectronics, model 24C64WP
The electrolytic capacitors on the motherboard are from Lelon.
The specification is 470 F100V.
Electrolytic capacitors are also from Lelon.
The specification is 100 F100V.
Close-up of the socket used to connect the cooling fan.
Close-up of the three working indicators.
A list of all dismantling and a family photo.
Huawei's PAH-3000WA power module is modular in design, with a cooling fan and indicator light at the front end, input and output sockets and communication connectors at the end of the module, which is easy to replace. The output specification of the module is 535v 56.1a, the calculated output power is 3000W.
Through the dismantling of the charging head network, it was learned that Huawei's power module is equipped with a fuse at the AC input for overcurrent protection, and a varistor and gas discharge tube for surge protection. The module is controlled by ST MCU, with the PFC switch and main switch from Toshiba, the PFC rectifier from Kyocera, and the synchronous rectifier and auxiliary power IC from Infineon.
There are multiple small boards inside the power module for auxiliary power supply and function control, saving space and occupancy. The internal main capacitors are from EPCOS and Chemi-Con, and the output filter capacitors are from Nichcon, and the internal components are glued and reinforced. The overall materials are well-known brands, and the internal workmanship is solid and reliable.