Who is more advantageous than the car inverter meter and Zhimi?

March 08, 2023

With the improvement of living standards, people are increasingly pursuing the quality of life, and some Westerners' lifestyles are gradually becoming popular in China. For example, self-driving barbecue, camping, etc., and these outdoor activities need to solve the problem of electricity use.
Foreigners are generally more inclined to use large-capacity energy storage power sources; and considering the cost of use, domestic users may choose more car inverters.
Recently, the Xiaomi Eco-chain has launched two car inverters, namely CZNBQ-1QM from Mijia and CZNBQ01ZM from Zhimi. In addition to the appearance of the product is not the same, the internal materials are also very different.
First, the appearance of the product
The Mijia CZNBQ-1QM car inverter looks like a drinking cup at the first glance. It is round and comfortable, and it is off the square, big and heavy impression of the general car inverter. The "cup" uses a gray magnetic metal and is coated with a Macbook-like metallic paint.
The car head is connected by a nylon-woven orange thick wire, so that the product is not monotonous. Configuration, a national standard five-hole AC output interface and two 5V USB DC charging interface.
The Chimi CZNBQ01ZM car inverter uses a square design and looks similar to a common USB multi-port charger. The input end is a gray cable with a car charger connector, and the output interface uses a 5-hole GB socket, which is consistent with the home plug. There is also a USB interface that supports QC3.0 fast charging, which can supply power for most mobile devices or driving recorders and car navigation.
Second, the internal structure
Due to the design relationship, the MZ CQNBQ-1QM car inverter has a whole internal glue filling. After disassembling, the most conspicuous are two metal heat sinks, and a large amount of thermal conductive glue (already removed) on the periphery of the heat sink to enhance heat dissipation, the main part It consists of two PCB boards.
Zhimi CZNBQ01ZM uses a small fan because it uses active cooling. So after disassembling, the interior looks cleaner. It also uses two aluminum alloy heat sinks and two PCB boards. The small board is responsible for USB fast charge output.
Third, the capacitor
The high voltage part, the Danyang Farah (FOAI) capacitor used by the Mijia CZNBQ-1QM.
USB interface part, the input filter is an electrolytic capacitor, and the output filter is a Wanyu solid capacitor.
The high-voltage capacitor used by Zhimi CZNBQ01ZM comes from Taiwan Lilong.
The USB interface of Zhimi CZNBQ01ZM uses two capacitors for filtering, and the brand is unknown.
Fourth, MOS tube
Mijia CZNBQ-1QM primary boost MOS comes from the deep love semiconductor SIF110N060, a total of two.
KODENSHI (photoelectron) SMK1060G, performance similar to 10N060.
Zhimi CZNBQ01ZM car inverter uses 2 AOTF260 as the boost switch tube.
Zhimi CZNBQ01ZM car inverter uses 4 AOTF12N50 outputs.
Five, the chip
The Mijia CZNBQ-1QM uses the KA7500 to control the alternate operation of two tubes, which are used to modulate the input 12V boost supply stage.
The KA7500 on the output side is responsible for driving four MOSs to modulate the DC power into 50 Hz AC.
The USB output section uses the ACT4533 and a two-way automatic identification chip.
Chimi CZNBQ01ZM on the back of a TL494, a 2902 4 op amp.
The output rectification section rectifies the alternating current of the inverter boost output.
The LM2902DG is produced by Ansonmei. The 4 op amps are used to detect input current limit and temperature controlled fans.
TI TL494, which is common to the KA7500 in the above-mentioned Zhongmi inverter, is used here to output the modulation of the AC.
The USB output part adopts ON Semiconductor's NCP4371 QC3.0 identification IC, and the step-down IC of the NCP3170 built-in switch tube on the right side of the board recognizes + step-down to form a USB fast charge output.
Summary Dismantling found that although these two car inverters do not use anything to black technology, but the products are very careful from design to materials. The Mijia CZNBQ-1QM car inverter greatly increases the reliability of the inverter by filling the interior with thermal conductivity. At the same time, the inverter provides two USB outputs to increase the practicability of the product. Zhimi CZNBQ01ZM car inverter is to achieve temperature control of the product by adding an active cooling fan.
And equipped with a USB interface that supports QC3.0 fast charge, it can be connected to high-power appliances or directly to the phone to achieve fast charge.

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