Preface
Optodecoupling isolation is the most widely used in switching power supplies. Optocoupler isolation can transmit signals in one direction, and complete the primary isolation in the form of photoelectric conversion to avoid interference with the sensitive components on the secondary side. However, optocoupler isolation drive has the shortcomings of poor common-mode interference suppression ability, insufficient isolation performance and reliability, long transmission delay, and high driver loss, which is difficult to meet the needs of today's switching power supply applications with increasing power.
The digital isolation chip also achieves primary level isolation, effectively avoiding signal interference in the circuit, and is very suitable for high-power power supply scenarios that require high precision and high reliability. Digital isolators are also higher in transmission performance than optocoupler isolation, with smaller transmission delay and offset, and the signal can maintain higher integrity and accuracy during transmission. In addition, compared with the traditional optocoupler isolation technology, due to its internal advanced digital signal processing technology, it can remain stable in the face of changes in the external environment, and is not easy to be interfered by these factors, and its long-term stability is higher.
Application of digital isolation chip in server power supply
Through the dismantling of the charging head network, it was learned that several server power supplies of Dell and Huawei replaced optodephone isolation through built-in digital isolation chips. The chip parameters in the article are shown in the figure, and the details will be introduced to you in detail below.
The cases in the article are listed in no particular order, in alphabetical order by brand.
Dell 495W Platinum Server Power Supply
Dell's server power supply was produced after about 2014, with a 12V output, an output current of 41.25A, and a maximum output power of 495W. In addition, this power supply provides 12V standby power with an output current of 3A. The power supply is brick-shaped, with PCB gold finger connectors.
Related Reading:
Teardown Report: Dell 495W Platinum Server Power Supply
Built-in digital isolation chip case
Sijiaxun Si8641BD
The Si8641BD is a low-power four-channel digital isolator that has certain advantages over traditional opto-decoupled isolation technologies in terms of data transmission rate, propagation delay, power consumption, size, reliability and external BOM. It supports 150Mbps transmission rate, operates at 2.5V~5.5V, and is available in SOIC-16 package.
Huawei 3000W titanium gold gallium nitride power supply
Huawei's PAC3000S12-T1 server power supply adopts the common brick shape and supports the quick-release design. The power supply input is equipped with a cooling fan and handle, and the output is equipped with a gold finger. The power supply is a single 12V output, the output specification is 12.3V 243.9A, and the calculated output power is 3000W.
Related Reading:
Teardown report: Huawei 3000W titanium gold gallium nitride power supply
Built-in digital isolation chip case
NOVOSENSE NSi8120N0
NOVOSENSE NSi8120N0 is a high-reliability dual-channel digital isolator for drive isolation, the chip supports 150Mbps transmission rate, supports 2.5-5.5V working voltage, has the characteristics of low power consumption, high electromagnetic immunity, and is available in SOIC-8 and SOIC-16 packages.
NOVOSENSE NSi8141W0
NOVOSENSE NSi8141W0 is a high-reliability four-channel digital isolator, the chip supports 150Mbps transmission rate, supports 2.5-5.5V working voltage, has high electromagnetic immunity and low power consumption, and is available in SOP16 and SOW16 packages.
Huawei 3000W GaN server power supply
Huawei's TMN1APSU power module has a short metal shell and is fixed by screws. The front end of the power supply is equipped with a C20 connector for AC power input, and there are two cooling fans and handles. The power output side is a gold finger, which is connected to power through the connector inside the device. The power output specification is 53.5V 56.1A, and the total output power is 3000W.
Related Reading:
Teardown report: Huawei 3000W GaN server power supply
Built-in digital isolation chip case
NOVOSENSE NSi8100N
NOVOSENSE NSi8100N is a high-reliability dual-channel digital isolation chip with high electromagnetic immunity and low power consumption, with a data transmission rate of up to 150Mbps, and is available in SOIC-8 and SOIC-16 packages.
NOVOSENSE NSi8141W0
The relevant information of NOVOSENSE NSi8141W0 has been mentioned above, so I will not repeat it here.
Summary of the charging head network
The application of digital isolation chips in server power supply marks a new stage of more reliable and efficient power supply industry. Compared with traditional optocoupler isolation, digital isolation chips show significant advantages in transmission performance, stability and reliability. Digital isolators provide higher transmission rates and lower transmission delays, ensuring high signal integrity and accuracy. Dissolution can remain stable when the external environment changes, and the long-term stability is higher. In addition, the digital isolator also has the characteristics of low power consumption and high electromagnetic immunity, which can adapt to the working needs of various complex electromagnetic environments.
It is believed that with the continuous development and progress of technology, digital isolation chips will play an increasingly important role in the future power supply design and provide more reliable support for the performance and reliability of the power supply system.
Some of the information in the article comes from the Internet, and is affected by the timeliness of the case, please forgive me if there are any omissions.