preface
For friends of DC-ATX and external graphics docks, 12V external power supply must be no stranger. Because the accessories in the computer are basically the highest, that is, 12V is used, and 12V is also the highest output voltage of the ATX power supply. Shenzhen Xinfei Technology Co., Ltd. and Dongguan Lingke MicroElectronics Co., Ltd. launched a 360W gallium nitride power supply, built-in dual 6Pin output interface, can simultaneously power the graphics card and motherboard, to meet the power supply needs of the computer.
It is reported that this power supply uses gallium nitride switch tube with LLC architecture, full load conversion efficiency of more than 95%, which is very important for fanless power supplies, can significantly reduce the heat generation of passive cooling power supply, reduce temperature rise. The power supply has a built-in Energy-depleted gallium nitride switch tube, which simplifies the drive and reduces the loss, effectively improves the conversion efficiency of the power supply, and can use passive heat dissipation.
Lingke micro 360W Gallium nitride server power supply appearance
Because this power supply is an industrial application, the interface belongs to the 6Pin interface inside the chassis and is not sold to consumers, so there is no need to tangle with the appearance.
The power supply comes with two 6Pin interfaces, calculated according to the safe load flow of 16AWG wire 12A, a single 6P terminal can carry the full power of the power supply.
The four corners of the power supply are fixed with four screws, and there is an information sticker in the middle of the bottom shell, marking the input as a wide voltage input of 100-265Vac, the output is 12V DC voltage, and the output current is 30A. The power supply is CE, UKCA, IC and FCC certified.
The power supply manufacturer is Dongguan Lingke Microelectronics Co., Ltd., made in China.
The power input is a common character interface on the computer power supply.
The power output is two sets of output lines, each set of output lines is 6 16AWG cores, corresponding to 6P terminals, 3 positive and 3 negative.
Close-up of the power output cable, 16AWG core.
Output 6Pin terminal close-up, 3 positive and 3 negative.
The output cable length is 40CM.
Compared to traditional desktop power supplies, this power supply is much flatter and more space-saving. Passive heat dissipation design, no fan noise, no dust, can be said to be maintenance-free, will not be because the fan running dust accumulation overheating caused by performance degradation.
The length of the power supply measured using a vernier caliper is approximately 190mm.
The width is about 110mm.
The power supply thickness is 40.6mm.
The measured diameter of the power output line is 8.63mm.
The measured weight was 905g.
Lingke micro 360W Gallium nitride server power supply disassembly
After a preliminary understanding of the appearance, size and weight of this 360W Gallium Nitride server, the following continues to disassemble it to see how the internal workmanship materials are.
Unscrew the four screws that secure the housing and easily detach the power supply. Inside the power supply housing is a stamped aluminum plate that fits into the power supply housing. The front transformer is attached with a thermal pad to conduct heat onto the housing. The back of the circuit board has an insulating plate attached to the inner shell, and the thermal pad corresponds to the heat dissipation of the gallium nitride switch tube and the synchronous rectifier tube.
Close-up of the heat dissipation aluminum plate inside the power supply housing.
The PCB module is covered with a large area heat sink for heat dissipation of the rectifier bridge, PFC switch tube and PFC rectifier tube.
On the output side are LLC transformers and resonant inductors, output filter capacitors and connecting wires.
After connecting the wire cold pressed terminals, it is welded and is not easy to break.
The length of the internal PCB board measured using a vernier caliper is approximately 181mm.
The width is about 100mm.
The thickness is approximately 31.7mm.
First remove the heatsink on the board, which holds the input rectifier bridge, PFC switch tube, and PFC rectifier tube fixed on it. The opening holes in the heat sink correspond to the corresponding PFC boost inductors.
A glance at the removed heat sinks.
At a glance on the front of the PCB, the inputs are EMI filter circuits, PFC boost inductors, filter capacitors, resonant capacitors, LLC transformers, and output filtered solid capacitors from right to left.
On the back of the PCB are the PFC controller, LLC controller, two gallium nitride switch tubes and output synchronous rectifier circuitry.
The following is a description of this power supply starting from the input side of the power supply.
The power supply adopts the pinzi socket input and is soldered directly to the PCB.
The two sides of the socket are blue Y capacitors for fire wire and zero wire to ground.
A close-up of another Y capacitor.
Slow melt fuse at the input, 10A 250V.
The input NTC thermistor, specification 8D-15, cold state resistance 8Ω, diameter 15mm, in series in the input circuit, used to suppress the inrush current when the power supply is connected to the power supply, reduce the spark when plugged in.
Relay from Dongguan Yongneng, YX201H-S-112DM, general power relay, contact using silver alloy, contact rated current 10A, coil voltage of 12V. It is used to bypass the NTC thermistor after the normal operation of the power supply, eliminate the loss of the thermistor in series in the circuit, and improve the efficiency of the power supply. The thermistor is bypassed and does not flow through the current, and the temperature drop resistance rises to prepare for the next power-up of the power supply.
The first stage of the power supply common mode inductance, wound using thick copper tape, the bottom welded insulating skeleton.
X capacitor close-up, from TOPCAP Tairong Electronic Technology.
Close-up of the second-stage common-mode inductor, the same as the first-stage common-mode inductor.
A close-up of the second X capacitor, the common-mode inductor and the Y capacitor are used to suppress interference.
The rectifier bridge is fixed to the heat sink by screws, the model is GBU10K, the rated current is 10A, and the withstand voltage is 1000V.
Rectifier output filter film capacitor, the same brand as X capacitor, TOPCAP, 1μF 630V withstand voltage, for output filtering, power supply to the PFC stage.
PFC circuits are used to improve the power factor, reduce the inrush current when charging the large-capacity electrolytic capacitor in the high-power charger, and avoid the impact of the inrush current on the power grid waveform. At the same time, PFC can also reduce the capacity of the primary electrolytic capacitor and reduce the volume of the charger by boosting.
The PFC controller is from ON Semiconductor, silk screen printed 54B65, the actual model is NCP1654, is a continuous conduction mode PFC boost controller, using fixed frequency mode, by the instantaneous coil current control on time. The chip peripherals are streamlined and feature programmable overcurrent protection to support perfect protection functions.
PFC boost switch tube from Dongwei Semiconductor, model OSG60R099HT3, NMOS, withstand voltage 600V, conductivity 99mΩ, using TO247 package, using screws through the insulating thermal pad fixed to the heat sink. It has extremely low switching losses, excellent stability and consistency.
PFC rectifier diode from China Resources Micro, CRXI04D065G1, is a 650V resistant silicon carbide diode, 158 °C working current 4A, using China Resources Micro's autonomous 6-inch silicon carbide production line manufacturing. The device features a low on-voltage drop that reduces on-losses and has very low switching losses. Available in a TO220 package, screws are used to secure the heat sink via an insulated thermal pad.
Sampling resistor for sensing PFC switch transistor current, 75mΩ 2512 alloy resistor, using two in parallel.
PFC bypass diode, model S5M, 5A 1000V.
The main filter capacitor is from Fongbin, 220μF 400V. The pen-shaped slender design reduces the overall height horizontally.
An external MOS tube for high-pressure start-up.
The power supply has a close-up of the built-in power supply regulator circuit, which consists of a triode and a voltage regulator.
Close-up of the supply capacitor, from OKCAP, with a specification of 25V 100μF.
The LLC controller from STMicroelectronics, model L6699D, is a symmetrical duty cycle inverter resonant half-bridge controller that supports LLC and LCC applications. Built-in 600V high-voltage isolated driver, support adaptive adjustment of the dead time setting, light load support burst mode, support safe start to avoid hard switching at startup.
Gallium nitride power device adopts Nenghua CE65D150DNBI, which is a depletion-type gallium nitride power device in DFN8*8 package, with a withstand voltage of 650V, a transient withstand voltage of 900V, a conductive resistance of 150mΩ, and a gate supporting -35V drive voltage and -55~150°C operating temperature.
Jiangsu Nenghua was established in 2010, the company mastered both enhanced and depleted gallium nitride technology, and has achieved mass production of products, the technical level is leading in China. The company masters a variety of GaN core technologies, the company's products have now formed a scale of sales, is expected to exceed 100 million yuan in 2022 sales.
In series with the Nenghua Gallium Nitride power tube is a low-voltage NMOS from Hengtaike, HGM090NE6A, with a withstand voltage of 65V and a conductivity of 7.8mΩ, which is packaged in a DFN3.3*3.3 package and is directly driven by the L6699D LLC controller.
The other Gallium nitride power device and the series NMOS are the same model, and the two make up the LLC half-bridge switching circuit.
Close-up of the resonant inductor, wound in a Leeds wire.
Two LLC transformers are connected in series at the primary level, with the T1 transformer primary winding the power supply winding and the secondary using Leeds wire winding.
Two blue resonant capacitors are from TOPCAP Androne with a specification of 333J 630V.
Close-up of the power supply filter capacitor from OKCAP with a specification of 35V 220μF.
At a glance on the output side, each transformer output has two solid capacitor filters, and the total output uses one solid capacitor filter for five capacitors.
817C optocoupler for output voltage feedback.
Secondary regulator circuits at a glance.
The synchronous rectifier controller adopts the SRK2001 synchronous rectification controller of ST Yifa, which is an adaptive synchronous rectification controller for LLC resonant converters, with built-in dual NMOS drive outputs, support for 32V supply voltage, with a total shutdown delay of 35ns, and synchronous rectifier tubes that support standard drive voltages.
Synchronous rectifier wire-printed PAS40N009C in DFN5*6 package. There are two identical synchronous rectifier circuits corresponding to the outputs of the two transformers, and the two outputs are connected in parallel.
Close-up of the third Y capacitor.
The output filter capacitors are from Yangzhou Shengyang, and the two filtered solid capacitors are 470μF 16V, which are low impedance series and high temperature resistance of 105°C.
The other filter capacitor has the same specifications, with two 470μF 16V in parallel.
The output filter capacitor is the Sunrise SS Series, 1200μF 16V.
Disassemble them all and take a family portrait.
The figure shows the efficiency test efficiency provided by the factory, and the input voltage of 115Vac and 230Vac is tested respectively. Corresponding to the input voltage of 230Vac, 25%, 50%, 75% and full load efficiency are 92.38%, 94.75%, 95.18%, 95.16%, respectively, which has exceeded the efficiency standard of 80PLUS platinum, and the full load efficiency exceeds the 80PLUS titanium standard.
Charging head net disassembly summary
This 360W server power supply realizes the server design of high-power passive heat dissipation by using gallium nitride technology and large-area heat sink. Because of the passive heat dissipation design, the power supply does not need a cooling fan, no noise, and does not need to be disassembled to clean the dust, becoming a maintenance-free power supply.
Through disassembly, the charging head network found that this 360W Gallium nitride server power supply adopts passive heat dissipation, and the fixed aluminum plate inside the power supply shell is used to increase the heat dissipation area. There are thermal pads on the front and back of the circuit board to dissipate heat from the transformer and switch tubes, reducing the temperature rise of long-term high-power operation.
The power supply adopts PFC+LLC architecture, fixed 12V output, and the input uses ON Semiconductor NCP1654 CCM PFC boost controller with East Micro MOS tube and Cr Micro Silicon Carbide diode. THE LLC uses an ITALIAN L6699 controller with two Nenghua gallium nitride switch tubes and Hengtaike NMOS. Two transformers are used, the inputs are connected in series, and the outputs are connected in parallel to meet the high-current output capability of 30A.
The output synchronous rectifier controller adopts the ITALIAN SRK2001, and the output is filtered by a solid solar capacitor. The power output is dual 6Pin terminals for dedicated use. This power supply is designed with passive heat dissipation in mind, and a large-area heat sink is used internally to dissipate heat from the heat-generating device on the PCB, effectively reducing the temperature rise of long-term operation. There is no passive heat dissipation of the fan, which effectively avoids the interference of long-term operation and fan noise on people, and also eliminates the problem of dust accumulation in the operation of the fan and affecting the heat dissipation performance.