Liangrui Group-Focus on power supply

Plug-in waterproof power supply

Desktop waterproof power supply

Liang Rui

Aluminum-housed waterproof power supply

PRODUCTS

We offer product services including R&D, manufacturing, and sales of LED power supplies, home appliance power supplies, medical power supplies, communication power supplies, and waterproof wires.

UL-approved 1.5W power adapter

SAA Australian Standard Certified 60W Waterproof Power Adapter

BS UK Standard Certified 60W Waterproof Power Adapter

GS European Standard Certified 60W Waterproof Power Adapter

UL-approved 60W waterproof power adapter

UL-approved 60W waterproof power supply

UL-certified 10W Dual USB

GS/CE-certified 24W waterproof switching power supply

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15 Year

Global supplier of high-quality power products for research, development, production, and sales

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2011

The company was founded in 2011

6000 +

Company factory area

56 +

Certification certificates (items)

90 million+

Annual output of over 9000000

ABOUT US

Dongguan Liangrui Electronics Co., Ltd.

Dongguan Liangrui Electronics Co., Ltd. was established in October 2011. Our factory covers an area of 6,000 square meters and is equipped with a plastic injection molding workshop, a wire harness workshop, an AI component insertion workshop, a surface-mount technology (SMT) workshop, an assembly workshop, a potting workshop, and a finished-product workshop. 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...

SOLUTION

Festival Lighting Fixtures

Provide safe and stable low-voltage power supply for Christmas tree lights and holiday decorative light strings, adapt to different lengths and power requirements, support series/parallel design, and ensure the stability of long-term lighting.

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SOLUTION

Gas Modeling Industry

Pneumatic models usually require inflation through inflation devices such as fans and air pumps. During this process, an adapter may be used to connect the inflation port of the gas mold to the exhaust port of the inflation device, ensuring sealing and compatibility between the two and preventing gas leakage.

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SOLUTION

Household Appliance Industry

The widespread adoption of smart home devices—such as floor robots, air purifiers, smart toilet seats, and kitchen appliances like high-speed blenders—is driving the development of power adapters toward lower power consumption and greater intelligence.

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SOLUTION

Security Surveillance Industry

The large-scale deployment and intelligent evolution of security monitoring devices such as smart access control systems, AI-powered facial recognition turnstiles, and smart sensors are trending toward centralized management and enhanced reliability.

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SOLUTION

Lighting Systems Industry

The widespread adoption of lighting systems such as LED luminaires, smart light bulbs, and intelligent streetlights—and the growing demand for intelligent control—are driving the development of driver power supplies and control systems toward higher luminous efficiency, intelligent dimming capabilities, and IoT integration.

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SOLUTION

Outdoor Lighting Industry

Drive small solar or low-voltage landscape lights, support IP65 and above waterproof rating, resist rain and snow erosion, suitable for gardens, parks and other scenes.

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Festival Lighting Fixtures

Gas Modeling Industry

Household Appliance Industry

Security Surveillance Industry

Lighting Systems Industry

Outdoor Lighting Industry

Why Choose Us?

R&D Team

For many years, we have made it our guiding principle to meet our customers’ needs in all our endeavors. We continuously enhance our internal management, pursue innovative development, ensure superior quality, reduce prices, and guarantee timely delivery. We’ve assembled a team that is experienced, bold in its thinking and action, and united in its drive for progress...

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Quality Control

We have a comprehensive and scientifically sound quality management system. We are committed to continuously improving our product manufacturing processes and quality, and constantly developing new products to maintain our competitiveness in the market. We are moving forward with time, striving toward the vision of a modern enterprise...

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Widely Used

The factory covers an area of 6,000 square meters and is equipped with a plastic injection molding workshop, a wire harness workshop, an AI component insertion workshop, a surface-mount technology (SMT) workshop, an assembly workshop, a potting workshop, and a finished-product workshop. We provide comprehensive services—from R&D and production to sales—of LED power supplies, home appliance power supplies, medical power supplies, communication power supplies, and waterproof wires.

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Attentive Service

The company emphasizes mutual development with its customers, suppliers, and workers. We cherish every opportunity to serve our customers, continuously enhance our service quality, meet their needs, and become a supplier that customers can trust.

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Qualification Certificate

Liangrui Group—We’re wholeheartedly at your service.

For product details or customized solutions, please contact us—our team is always ready to provide fast and professional support.

BLOG

Company News

Industry News

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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?

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04-16

2022

2022-03-17

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.

2022-03-16

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!

2022-01-08

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!!!

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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