Same as notebook maintenance, mobile phone maintenance is also inseparable from DC adjustable power supply. DC power supply can be used to test voltage and current, charge the battery, and determine short-circuit fault points. It should be said that it is an essential tool for mobile phone maintenance. But how to choose DC power supply in mobile phone maintenance? We will briefly talk about.
In terms of form, DC power supply can be divided into two types, pointer type and digital display type. Previous mobile phone repair masters prefer pointer type power supply. They think that the pointer to display the current change is very intuitive. It is the same reason as some masters like to use pointer multimeters, but with the development of maintenance technology, it is an unstoppable trend for digital display power to replace pointer power. The result is more accurate. Many power supplies can display 3 digits after the decimal point, while the pointer power supply can only display 1 digit. Now, the current of many leakage motherboards is within 10MA, so only the digital display power supply can be used to judge more accurately. Moreover, due to the old design of the power supply of the pointer, the maximum current is generally within 2A, but now many high-end smart phones and tablets need 3A current to work. Based on the above two points, it is only a matter of time before the pointer power supply exits the maintenance market. In order to better maintain new models, it is necessary to quickly get started with the use of digital display power supplies.
Digital display power supply can be divided into two types: programming and non-programming. To put it simply, programming can preset N sets of voltage and current setting data. Different products can choose different voltage and current data, and switch directly by pressing the button. Yes, but this is of little significance to repairing mobile phones, because repairing mobile phone generally only needs a set of fixed setting data, and the most important thing is that the voltage of program control is basically very expensive, so choose a non-programmable power supply is enough .
The parameters of the power supply are also various, how to choose? In fact, the most important thing is the choice of voltage and current. There are two common voltage parameters of 0-15V and 0-30V on the market. This parameter refers to the maximum output voltage. Because repairing a mobile phone only uses a maximum of 5V voltage, so these two are sufficient, but In order to repair mobile phones using fast charging technology and other electronic products in the future, it is recommended to choose a voltage of 0-30V.
The choice of current is more important. Within the acceptable price, the higher the current, the better, because the performance of smart large-screen machines is getting stronger and stronger, and the power consumption is also increasing. The CPU performance of some machines even exceeds the performance of computer CPU a few years ago. It is foreseeable that the development trend of mobile phones in the future will continue like this. For example, the boot current of Huawei new mobile phones has reached 2.5A, so when purchasing tools, be sure to purchase a power supply that supports a large enough current. 3A is recommended. Probably 5A is better.
If you are tired of choosing, you can directly choose P2408S intelligent regulated DC power supply. This product is an indispensable and powerful tool in mobile phone repair.
P2408S intelligent regulated DC power supply features:
• Support battery charge and discharge round cycle test and calibration for 11-13 full series, built-in APP for battery calibration
• Precise control of output voltage, the detected value can be precised into 1mA
• Adjustable 24V/8A DC power supply, support burn-in detection and repair
• Pointer, curve and digital display, three types help monitor comprehensively
• Support iOS 6-13 series battery PD fast charging protocols, the current can reach to 3A+
The following is the reference list of purchase parameters for mobile phone repair power supply
1. Voltage output requirements: DC 0~15V adjustable, a larger voltage adjustment range is optional;
2. Current output capability: up to 3A;
3. Power supply ripple: peak-to-peak value less than 50mV (20Hz~20MHz);
4. Abnormal switching voltage: the output voltage glitch in the power switch, the overshoot (voltage higher than the set output value) is less than 0.5V, and the undershoot is less than -0.5V;
5. Voltage overshoot: When the phone or motherboard is powered on and off, the voltage overshoot on the phone must not exceed 0.5V;
6. Requirements for power wires: the impedance of the single wire from the output end of the power supply to the load is less than 0.2 ohms;
7. Power supply stability: When no voltage adjustment is made, there must be no voltage jump or automatic offset. This problem is prone to occur after the knob-type power supply is aging;
8. Power supply grounding requirements: The power supply body needs to be connected to the real ground (connected to the nearby zero-potential ground through wires, such as connected to underground metal water pipe heating pipes, etc.), connected to other electrically suspended objects (such as work on the iron shelf of the table) is pointless.
The above is the content about how to choose DC power supply in mobile phone maintenance, I hope it will be helpful. If you have any questions, feel free to contact AiXun.
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