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The power adapter of the mobile phone needs to be recognized for the voltage volt

The power adapter of the mobile phone needs to be recognized for the voltage volt

1. Types and specifications of mobile phone chargers Mobile phone chargers can be divided into two categories based on their output current and voltage: direct charging and seat charging. Direct charging, also known as fast charging, can be directly plugged into a power outlet to charge a mobile phone; On the other hand, a charging dock requires placing the phone on the charging dock for charging. In addition, according to the different output currents, mobile phone chargers are divided into different specifications such as 1A and 2A. The requirements for chargers vary among different brands and models of mobile phones. 2. Compatibility of different brands of mobile phone chargers Many users often mix different brands or models of phone chargers for convenience. However, due to differences in chip and circuit design used by different brands of mobile phone chargers, their output current, voltage and other parameters are also different. Therefore, mixing them may cause damage to the chargers and even lead to safety accidents. Therefore, it is not recommended to mix different brands of mobile phone chargers.

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The driving method of LED lighting power supply

The driving method of LED lighting power supply

LEDs cannot directly use conventional mains voltage. Due to the characteristics of LED light sources, in order to meet the special voltage and current requirements of LED, it is necessary to use specially designed voltage conversion equipment to ensure the normal operation of LED. So LED lighting fixtures have a different power drive method from traditional lighting fixtures. The driving methods of LED lighting power supply include two types: Firstly, a constant current driving power supply. 1. The output current of a constant current drive circuit is constant, while the output DC voltage varies within a certain range with the size of the load resistance. When the load resistance is small, the output voltage is low, and the larger the load resistance, the higher the output voltage; 2. A constant current circuit is not afraid of load short circuits, but it is strictly prohibited to completely open the load; 3. The constant current drive circuit is ideal for driving LEDs, but relatively expensive; 4. Attention should be paid to the maximum withstand current and voltage values used, which limit the number of LEDs used. Secondly, a regulated driving power supply. 1. After the various parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, while the output current changes with the increase or decrease of the load; 2. The voltage stabilizing circuit is not afraid of open circuit of the load, but it is strictly prohibited to have a complete short circuit of the load; 3. Drive the LED with a voltage stabilizing driving circuit, and add appropriate resistors to each string in order to make the brightness of each LED display average;

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The Development Status of LED Driver Power Supply

The Development Status of LED Driver Power Supply

While LED is shining brightly, LED driver power is of utmost importance in the development of the LED industry chain. The lifespan and reliability of LED driver power directly affect the longevity of LED light sources. So, as the LED industry chain continues to integrate and develop, the maturity of LED driver power technology plays a decisive factor. Due to the rapid development of the LED industry, it has gradually shifted from government lighting to civilian lighting. Thanks to a series of policies recently introduced by the country to encourage the development of the LED industry

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How many classifications are there for LED driver power supplies

How many classifications are there for LED driver power supplies

By drive mode (1) Constant current type a. The output current of a constant current drive circuit is constant, while the output DC voltage varies within a certain range with the size of the load resistance. When the load resistance is small, the output voltage is low, and the larger the load resistance, the higher the output voltage;

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Characteristics of LED driver power supply

Characteristics of LED driver power supply

According to the electricity consumption rules of the power grid and the characteristic requirements of LED drive power supplies, the following points should be considered when selecting and designing LED drive power supplies: 1. High reliability, especially like the driving power supply for LED street lights, installed at high altitude, with a waterproof aluminum shell driving power supply. If the quality is good, it is not easy to break and reduces the number of repairs. 2. High efficiency LEDs are energy-saving products, and the efficiency of the driving power supply should be high. For the structure where the power supply is installed inside the lamp, it is particularly important. Because the luminous efficiency of LED decreases with the increase of LED temperature, the heat dissipation of LED is very important. The power supply has high efficiency, low power consumption, and generates less heat inside the lamp, which reduces the temperature rise of the lamp. It is beneficial for delaying the light decay of LEDs. 3. High power factor is a requirement of the power grid for loads. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of individual appliances with low power has little impact on the power grid, lighting up at night and concentrating similar loads can cause serious pollution to the power grid. For LED driver power supplies ranging from 30 watts to 40 watts, it is said that there may be certain requirements for power factor in the near future. There are two driving modes available: one is a constant voltage source that supplies multiple constant current sources, with each constant current source supplying separate power to each LED. This method is flexible in combination, and if one LED fails, it will not affect the operation of other LEDs, but the cost will be slightly higher. Another method is direct constant current power supply, with LED series or parallel operation. Its advantage is that it has a lower cost, but poor flexibility, and it also needs to solve the problem of one LED malfunction, which will affect the operation of other LEDs. These two forms coexist for a period of time. The multi-channel constant current output power supply method will have better cost and performance. Perhaps it is the mainstream direction in the future. 5. The ability of LED surge protection to withstand surges is relatively poor, especially in terms of resistance to reverse voltage. Strengthening protection in this area is also important. Some LED lights are installed outdoors, such as LED street lights. Due to the load shedding of the power grid and the induction of lightning strikes, various surges may invade the power grid system, some of which can cause damage to the LED. Therefore, the LED driver power supply should have the ability to suppress surge intrusion and protect the LED from damage. 6. Protection function: In addition to conventional protection functions, it is best to add LED temperature negative feedback in the constant current output of the power supply to prevent excessive LED temperature. 7. In terms of protection, the external installation type of the lamp should be waterproof and moisture-proof, and the outer shell should be sun resistant. 8. The lifespan of the driver power supply should match the lifespan of the LED. 9. It must comply with safety regulations and electromagnetic compatibility requirements. With the increasing application of LED, the performance of LED driver power supply will become more and more suitable for the needs of LED

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What is LED power supply

What is LED power supply

LED driver power supply is a power converter that converts the power supply into a specific voltage and current to drive LED lighting. Generally, the input of LED driver power supply includes high-voltage AC (i.e. mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers), etc. The output of LED driver power supply is mostly a constant current source that can change the voltage with the change of LED forward voltage drop value.

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Power adapter usage guide

Power adapter usage guide

Connect the power adapter correctly: 1. Check if the plug and socket of the power adapter match, ensuring that the input voltage range of the power adapter matches the local power grid voltage. 2. Insert the adapter plug into the power interface on the device, ensuring that the plug is tightly connected to the interface. 3. Insert the other end of the power adapter into a power outlet to ensure a secure connection. 03 Important precautions: 1. Avoid overload: When using a power adapter, make sure that the power of the device does not exceed the rated power of the adapter to avoid overheating or damage to the device. 2. Avoid overvoltage and overcurrent: Regularly check the working status of the power adapter to ensure that the voltage and current are within a reasonable range to ensure the normal operation of the equipment. 3. Avoid prolonged use: Prolonged use of the power adapter may cause overheating and even safety issues. Therefore, it is recommended to take appropriate breaks and regularly unplug the power adapter.

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Correct usage of power adapters

Correct usage of power adapters

A power adapter is an electronic device that can convert AC power from the power grid into the DC power required by the device. When using a power adapter, it is important to pay attention to the following points: 1. Confirm the parameters of the power adapter: Before using the power adapter, it is necessary to confirm whether the voltage, current, and power parameters of the power adapter match the device. If not matched, it may lead to equipment damage or safety accidents. 2. Connect the power adapter: Insert the plug of the power adapter into the power socket, and insert the plug of the output end of the adapter into the power interface of the device. 3. Start using: After confirming that the connection is correct, turn on the power switch of the device to start using. 4. Pay attention to safety: When using a power adapter, it is necessary to pay attention to safety. Avoid prolonged overuse or overcharging to prevent safety accidents such as fires. 5. Storage of power adapter: When not in use, it should be stored in a dry and ventilated place to avoid moisture or heat. In short, the correct use of power adapters helps to extend the lifespan of equipment, improve usage efficiency, and ensure personal and property safety.

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