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How much do you know about waterproof power supplies?

Quick Tips on Waterproof Power Supplies — How do you step down the voltage in an LED waterproof power supply? Let’s learn together! 1. Voltage Reduction Using Resistors in LED Waterproof Power Supplies: This method relies on resistors to reduce voltage. However, it is highly susceptible to fluctuations in grid voltage and is not easy to design as a stable power supply. The voltage-reducing resistor consumes a significant amount of power, which greatly increases the overall cost of the LED waterproof power supply. As a result, this type of power supply has very low power output and relatively poor system reliability. 2. Voltage Reduction Using Resistors and Capacitors in LED Waterproof Power Supplies: While this method improves the overall performance of the LED waterproof power supply, it still suffers from issues. During flashing, the charging and discharging of the capacitor cause extremely high instantaneous currents through the LED, easily damaging the chip. Additionally, this method is sensitive to fluctuations in grid voltage, resulting in low power efficiency and poor reliability. 3. Voltage Reduction Using Electronic Transformers in LED Waterproof Power Supplies: This method offers lower power output, but significantly improves the physical characteristics of the LED waterproof power supply. The voltage range is also relatively narrow, typically between 90V and 260V, and the ripple interference is considerable. Have you all learned these little tips?

2022

What are the different types of LED power supplies?

LED power supplies come in many varieties, and there are significant differences in quality and price among them. This is one of the key factors influencing both product quality and pricing. LED power supplies can be categorized into two main types based on their driving methods: 1. Constant-Current Type ① Constant-current driver circuits are ideal for driving LEDs. ② Although constant-current circuits are not afraid of short circuits in the load, they must never be allowed to have a completely open circuit. ③ The output current of a constant-current driver circuit remains constant, while the output DC voltage varies within a certain range depending on the magnitude of the load resistance. ④ The number of LEDs that can be used must be limited, as each LED has maximum allowable current and voltage ratings. 2. Voltage-Stabilized Type ① After the parameters of the voltage-stabilized circuit have been set, it outputs a fixed voltage; however, the output current will change according to the increase or decrease in the load. ② Although voltage-stabilized circuits are not afraid of open-circuit loads, they must never be allowed to have a complete short circuit. ③ Voltage fluctuations after rectification can affect the brightness of the LEDs. ④ To ensure uniform brightness when driving LEDs with a voltage-stabilized circuit, appropriate resistors must be added. Dongguan Liangrui Electronics Co., Ltd. provides you with solutions, quotations, technical support, and purchasing consultation services for power supplies, including LED power supplies. Our company specializes in the R&D, manufacturing, sales, and service of power supplies, LED power supplies, power adapters, and other power-related products. We welcome your inquiries! Our products have passed safety certifications from major developed countries such as the U.S., Europe, and Australia, including UL, CUL, TUV/GS, CE, SAA, and PSE. We have also obtained ISO:9001:2015 quality management system certification and were honored in 2018 with the title of "Guangdong High-Tech Enterprise" and the "Premium Supplier" award by Global Sources.

2022

Which power adapter brand is the best?

When selecting a power adapter that’s right for your product, you need to consider factors such as price, quality, service, reputation, and whether it’s a good fit for your specific needs—all these aspects should be taken into account together. For over a decade, Dongguan Liangrui Electronics has been a technology manufacturer specializing in power adapters, offering a comprehensive service from R&D through production and delivery. We boast high efficiency, reliable quality, and short production cycles. Our company is certified under the ISO:9001:2015 quality management system and was honored in 2018 with the title of “Guangdong High-Tech Enterprise” and the “Premium Supplier” award from Global Sources. Internally, we have an EMI laboratory, an incoming material inspection lab, a finished-product testing lab, and multiple automated production lines. Our products have successfully passed safety certification standards from leading European and American countries, including UL, CUL, TUV/GS, CE, SAA, and PSE. In response to global energy-saving requirements, all our products comply with energy-efficiency standards such as ERP, NRCAN, DOE, CEC, and MEPS VI. We place great emphasis on environmental protection, and all our products meet stringent environmental regulations like RoHS, REACH, and California Proposition 65. We’re your top choice! We warmly welcome both new and existing customers to call us for inquiries!

2022

Types of Power Adapters

Power adapters are mainly divided into two types: switching power supplies and linear power supplies. 1. A switching power supply is a type of power supply that uses modern electronic technology to control the on-time and off-time ratio of switching transistors, thereby maintaining a stable output voltage. Typically, the switching power supply in a power adapter consists of a pulse-width modulation (PWM) control IC and MOSFETs. Its advantages include high efficiency, small size, and the ability to operate over a wide voltage range. Its disadvantages are significant electromagnetic interference to the power circuit and relatively difficult troubleshooting when failures occur. 2. A linear power supply converts AC power into an unregulated DC voltage through a transformer and a rectifier-filter circuit. To achieve high-precision DC voltage output, the power adapter must employ a voltage feedback circuit to adjust the output voltage. Advantages: This power supply technology is mature, the circuit is simple, and it does not suffer from the interference and noise inherent in switching power supplies. Disadvantages: The voltage feedback circuit operates in a linear mode, resulting in high power consumption by the adjustment transistor and low conversion efficiency. Additionally, due to the use of inductive transformers, the equipment tends to be heavier. For many years, Dongguan Liangrui Electronics Co., Ltd. has taken meeting customer needs as the guiding principle for all our work. We continuously improve our internal management, pursue innovative development, ensure product quality, reduce prices, and guarantee timely delivery. We have built a team that is experienced, daring to think and act, and united in its pursuit of progress. Our company has obtained ISO:9001:2015 quality management system certification, was awarded the title of “Guangdong High-Tech Enterprise” in 2018, and received the “Premium Supplier” award from Global Sources. Internally, we have established an EMI laboratory, an incoming material inspection laboratory, a finished-power-supply inspection laboratory, and multiple automated production lines. We warmly welcome new and existing customers to leave messages and inquiries!!!

2022

How to Choose the Right LED Driver Power Supply

First, you need to provide the LED lamp’s specifications, such as power rating, number of LEDs connected in series and parallel, current, voltage, and so forth. Otherwise, there’s no way to select a suitable power supply—after all, you wouldn’t choose the power supply first and then match it with the LED lamps, would you? After all, the LED lamp’s power requirement should be determined based on factors like room size and desired brightness. Selecting an LED Power Supply: 1. Current: The ideal output current of an LED power supply should be around 90% of the LED lamp’s rated current—not exceeding the rated current, or the LED lamp’s lifespan will drop dramatically; nor should it fall below 70% of the rated current, as this would significantly reduce the LED lamp’s brightness. Ideally, the accuracy of the LED power supply’s output current should be within ±5%; the higher the accuracy, the better. If the current accuracy exceeds ±10%, absolutely avoid using that power supply—it not only causes unstable brightness but also drastically shortens the LED lamp’s lifespan. 2. Voltage: The output voltage range of an LED power supply should ideally cover 80% to 120% of the LED lamp’s rated voltage; at this range, both efficiency and power factor are relatively high. The minimum output voltage of the LED power supply must be less than 90% of the LED lamp’s rated voltage, while the maximum output voltage must exceed 110%. Otherwise, differences and inconsistencies in the LED bead parameters could prevent the LED lamp from lighting up altogether. Although a wider output voltage range may lead to lower efficiency and power factor, it won’t affect normal operation. Dongguan Liangrui Electronics Co., Ltd. was established in October 2011 and is located in Hengli Town, Dongguan—a region with convenient transportation links. It takes less than one hour to drive north to Guangzhou, south to Shenzhen, east to Huizhou, and west to Zhongshan. The company’s factory covers an area of 5,200 square meters and includes injection molding workshops, wire harness workshops, AI component insertion workshops, surface-mount technology (SMT) workshops, assembly workshops, potting workshops, and finished-product workshops. We offer comprehensive services—from R&D and production to sales—covering LED power supplies, home appliance power supplies, medical power supplies, communication power supplies, and waterproof wires. All of our products have passed safety certification standards set by major developed countries such as the U.S., Europe, and Australia, including UL, CUL, TUV/GS, CE, SAA, and PSE certifications.

2022

What is the principle behind a power adapter?

What is the principle behind a power adapter? An AC-to-DC power converter transforms alternating current into direct current, which then powers the computer. However, this type of converter itself cannot protect the computer. That’s because the computer contains an internal storage device—also known as a charger—that can safeguard the computer during power outages. Both switching power supplies and adapters are types of switching power supplies, both consisting of high-frequency switching transistors and their associated control circuits. An adapter power supply is a regulated switching power supply, while a switching-power-supply charger features a float-charging function: its voltage increases as the current decreases, eventually reaching a state where only voltage remains with no current flowing at all.

2022

Common Faults and Troubleshooting Methods for Power Adapters

1. Line Faults Line faults include issues such as damaged power cords, electrical mismatches, and poor contact due to oxidation at connection points. It is crucial to carefully check whether the input and output lines are receiving power. If a line fault is detected, it can be resolved by replacing the power cord or taking other appropriate corrective measures. 2. Low Output Voltage The following are the primary causes of low output voltage: 1) Short-circuit failure in the switching power supply’s load (especially in DC/DC converters, where short circuits or poor performance may occur). In such cases, first disconnect all loads from the switching power supply and determine whether the issue lies with the power supply circuit itself or with the load circuit. If the output voltage returns to normal after disconnecting the load circuit, the problem is likely due to an overloaded load. If the voltage remains abnormal even after disconnecting the load, the switching power supply circuit itself is defective. 2) Failure of filter capacitors or rectifier diodes at the output voltage terminals. This can be diagnosed by replacing these components. 3) Deterioration of the switching transistor’s performance, causing it to fail to conduct properly, increasing the internal resistance of the power supply and reducing its load capacity. 4) Poor condition of the switching transformer, which not only leads to a drop in output voltage but also results in insufficient excitation of the switching transistor, potentially damaging the transistor itself. 5) Defective 300V filter capacitor, which reduces the power supply’s ability to handle loads—once a load is connected, the output voltage will immediately drop. 3. High Output Voltage High output voltage typically originates from the sampling and voltage regulation control circuits. 4. Blown or Exploded Fuse The main areas to inspect include the rectifier bridge, individual diodes, switching transistors, and the large filter capacitor on the 300V bus. A blown or blackened fuse could also indicate a problem with the anti-interference circuit. Particularly noteworthy: when a fuse blows due to a switching transistor breakdown, the power supply’s control chip and current-sensing resistor often get damaged as well. The thermistor is also prone to being burned out along with the fuse. Liangrui Electronics’ products have passed safety certification standards from developed countries in Europe and the U.S., including UL, CUL, TUV/GS, CE, SAA, and PSE. In response to global energy-saving requirements, all our products comply with ERP, NRCAN, DOE, CEC, and MEPS VI energy efficiency standards. We place great emphasis on environmental protection, and all our products meet RoHS, REACH, California Proposition 65, and other environmental regulations. Our company guarantees that every product leaving our facility undergoes ICT testing, PCBA electrical testing, assembly electrical testing, high-voltage testing, aging tests, and pre-packaging inspections, ensuring that we provide customers with safe, energy-efficient, environmentally friendly, and reliable power supply products. We welcome new and existing customers to call or leave a message for inquiries!

2022

What are the differences between waterproof transformers and rainproof transformers?

Many people, when they’re not familiar with waterproof transformers and rainproof transformers, might mistakenly think these two types are identical. In fact, whether from the perspective of waterproof rating or from the standpoint of performance and application scenarios, there are significant differences between the two. 1. Differences in Protection Ratings: Waterproof transformers have high waterproof ratings ranging from IP67 to IP68, which can completely prevent dust from entering and allow them to be submerged in water for extended periods. Rainproof transformers, on the other hand, have a waterproof rating of IP44, which only prevents solid objects larger than 1mm from entering (dust protection) and ensures that liquids splashed onto the enclosure from any direction won’t cause damage or affect its performance (rain protection). 2. Different Application Scenarios: Waterproof transformers are typically used more frequently in lighting applications, such as underwater lights, buried lights, fountain lights, and large-scale outdoor illumination projects. Rainproof transformers, by contrast, are generally suitable for building illumination, nighttime landscape lighting, guardrail tubes, digital displays, and other similar lighting projects, making them the preferred power supply choice for outdoor products. Dongguan Liangrui Electronics Co., Ltd. was established in October 2011 and is located in Hengli Town, Dongguan—a region with convenient transportation links. It takes less than an hour to drive north to Guangzhou, south to Shenzhen, east to Huizhou, and west to Zhongshan. The company’s factory covers an area of 5,200 square meters and includes injection molding workshops, wire harness workshops, AI component insertion workshops, surface-mount technology (SMT) workshops, assembly workshops, potting workshops, and finished-product workshops. We provide comprehensive services—from R&D and production to sales—offering LED power supplies, home appliance power supplies, medical power supplies, communication power supplies, and waterproof wires. Our products have been certified to meet safety standards in major developed countries such as the U.S. and Europe, including UL, CUL, TUV/GS, CE, SAA, and PSE. In response to global energy-saving requirements, all our products comply with energy-efficiency standards like ERP, NRCAN, DOE, CEC, and MEPS VI. We also place great emphasis on environmental protection, ensuring that all our products meet RoHS, REACH, California Proposition 65, and other relevant environmental regulations. We promise that every product leaving our factory undergoes rigorous testing—including ICT testing, PCBA electrical testing, assembled-unit electrical testing, high-voltage testing, aging tests, and pre-packaging inspections—to deliver safe, energy-efficient, environmentally friendly, and reliable power solutions to our customers. We warmly welcome new and existing customers to call or leave us a message for inquiries!

2021

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sales@rico-electronic.net

Dongguan Liangrui Group

Tel: +86-18038246588
Tel: +86-13537305053
Fax: +86-769-83795789
Website: www.rico-electronic.net
Email: sales@rico-electronic.net
Address: Room 1101, Building 1, Unit 6, Shidai Zhihui, Luwu Village, Changping Town, Dongguan City, Guangdong Province

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