Millet 49 yuan patch panel dismantling: Where are the tens of millions of research and development?

Every time you enter a new field, the original product price system is destroyed. This is basically the Xiaomi technology style. This time it is not the intelligent hardware, but the most traditional electrical products - the power strip. Many people have several mobile devices on hand. The charger and the power strip are basically two items that everyone can't live in. They need to plug in a few chargers when charging mobile devices. The board socket is very troublesome to use.

The price of a good quality four-position patch panel in the market is about 20 yuan, and the price of a multi-port 5V / 3A charger is at least 20 yuan. Is the 49 yuan millet patch panel sold at the rice noodle festival worth the money? In principle, the millet patch panel can be seen as a four-position plug-in board plus a 3-port charger. The price of two separate products is almost the same as that of the millet patch panel. It is a production process and quality problem.

The basic parameters of the millet patch panel are as follows:

Appearance details:

Most domestic brands of power strips have been difficult to get rid of the appearance of "stupid big and thick" image for decades, so that in recent years, a friend consulted to buy the patch panel to recommend APC and other foreign brands of the patch panel. The size of the millet patch panel is 225mm (length) x 41mm (width) x 26mm (height). The detail design is quite in place. The appearance is exquisite and simple. If you use Xiaomi, it is "like a work piece like a plug-in board". The patch panel is used. It is made of one-time non-marking injection molding, which fundamentally changes the image of the plug-in board. The pure white appearance can be better integrated into the use environment, the side of the patch panel is mirror polished, and the top surface is treated with a fine sanding process. After a period of use, the matte top surface is more likely to be ash and difficult to clean.

There are 3 new national standard five-hole power sockets and three USB charging sockets on the power strip. The zero and fire wire electrode sockets of the socket are designed with independent safety doors to prevent children from touching the poles with sharp metal objects.

The power strip switch uses the power switch produced by Qiao Ri Electric Industry to have overload protection function. When the power strip is overloaded or short-circuited, it can be powered off in time to ensure safe use of electricity. The white light indicator is built into the power switch, and the light looks softer through the switch housing.

The patch panel power plug is small, the top has a Xiaomi Logo logo, and the pins have zero, fire, and ground mark. The power cable connection plug and the position near the power strip are often bent and easily damaged during use. The millet power strip is equipped with a rubber ring at these two positions to improve the life of the power strip.

The length of the external power cord of the millet patch panel is 1.8 meters. The power cord is a PVC sheathed flexible cable (60227 IEC52). The internal is made of three 0.75mm? 2; The wire is composed, each wire is twisted by multiple strands of thin copper wire, and the flexibility is strong.

A rubber anti-slip foot pad is installed on the screw hole of the back of the millet patch panel, and the non-slip mat is slightly higher than the surface of the patch panel, which can effectively improve the stability of the patch panel on the desktop.

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Charging test:

The millet patch panel has a built-in 5V / 3.1A power module for 3 USB charging ports. Each USB interface has a rated output current of 2.1A. The power module has intelligent charging management function, which can automatically identify the device and support device 2A fast charging. In the actual trial, the millet patch panel can provide 2A fast charging for the glory 6 mobile phone, and the measured maximum output power of the power module can reach 19W. (Note: The standby power consumption of the measured power strip 0.3W is basically consumed by the indicator light. When the USB interface is not connected to the charging device, the actual power consumption of the power module is very small).

Disassembly:

The plastic outer casing of the millet patch panel is quite high. Although the four screws of the rear shell are removed, there are hidden multiple buckles inside. It is not easy to completely disassemble it. It is necessary to ask for tools and take some time. Unlike most brands of power strips, the use of point-by-point soldering inside each electrode is very different. The millet patch panel can be said to be a piece of copper. The three socket electrodes of the patch panel are made of phosphor-copper. Breakpoint connection eliminates the phenomenon of virtual soldering short circuit.

Compared with the plug-in board of a certain brand, the interior of the millet patch panel is more compact and tidy.

The inside of the power strip can be functionally divided into three areas: power switch, socket and power module. The rear case is specially designed with an isolation protection piece in the position of the power module area to isolate the high and low voltage circuits of the power module to ensure the safety of the USB charging interface.

Power switch: Zero and fire wire in the power line of millet power strip are directly soldered to the power switch. The neutral line is the straight line, and the live line is controlled by the switch. The power switch and the integrated electrode are solder-free socket connection technology.

Qiao Ri Electric is specially designed for the millet patch panel with overload protection power switch, switch built-in indicator.

Socket: The millet power strip adopts 0.4mm (thickness) x 4.2mm (width) phosphor bronze material integrated copper strip process to connect three socket electrodes, the socket connection has no solder joints, and the conductive performance is strong, avoiding the occurrence of solder joints or internal short circuits. Security Risk.

Power module: The USB charging interface of the power strip is powered by a switching power supply. The primary and secondary circuits of the power module are designed with a hollow isolation on the PCB, and the isolation plate is used for isolation in the rear case to completely eliminate the risk of leakage or short circuit. The secondary power output line uses PCB piercing technology to enhance the charging output current.

The primary circuit of the power module is designed with filter circuit and fuse to avoid grid noise interference and damage the power module. The primary circuit uses three aluminum electrolytic capacitors produced by Farah, including one 10uF/420v regulator filter capacitor and two 6.8 capacitors. uF/420v high frequency capacitor, the primary circuit is thick.

The secondary circuit of the power module uses two ULR 470uF/10v solid capacitors. The solid capacitors have the advantages of durability and no explosion, which effectively improves the service life of the power module and enhances the stability of the output voltage.

The power module primary switch uses the SIF7N65D from Sisemi, specification 7A / 650V, which is much higher than the switch specifications used in most power adapters.

The power module uses the APR34309 driver chip and the 3776BM PWM chip.

The USB charging interface uses TPS2513 and TPS2514 two-chip identification chip to provide fast charging device identification management for three USB interfaces.

Conclusion:

The appearance design and manufacturing process of the millet patch panel are quite elegant. The internal structure is viewed by disassembling the patch panel. The materials used for the components of the patch panel are quite good and the assembly process is good. Under the condition that many patch panels in the market are shoddy and the price is too high, the millet patch panel provides a benchmark for the domestic electrical industry. These days, many similar plug-in boards can be seen from several e-commerce platforms. There are price cuts, which may help the entire industry improve product quality and set a more reasonable price. The use environment of the millet patch panel is somewhat blurred. As a household, there are only three sockets. As for the travel, the block head is a bit large. I hope that the plug-in board with 6 sockets and 2 sockets will be introduced to the market later.

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More connector technology hot text can be accessed in the special issue page for free download: "Connector Technology Special Issue"