SQP CR-L Ceramic Cement Resistor 20W 1000 Ohm 5% For Charger Aging

SQP CR-L Ceramic Cased Cement Resistor 20W 1000 Ohm 5% For Charger Aging

What is cement resistor ?

In fact, cement resistor does not have cement itself, but why is it called cement resistance? (Wirewound or metal oxide film) core, package filler, soldering lead and ceramic shell, etc., and some have metal brackets outside. Cement resistor packages generally have two types: horizontal and vertical.
Cement resistors are resistors that are potted with cement, that is, the resistance wire is wound on a non-alkali heat-resistant ceramic part, and the outside is protected by heat-resistant, moisture-resistant and corrosion-resistant materials, and the wire-wound resistor body is placed in a square shape. Porcelain frame, with special non-flammable heat resistance. Its function is the same as that of general resistance, but it can be used in occasions with large current, such as being connected in series with the motor to limit the starting current of the motor, and the resistance value is generally not large. Cement resistors have the characteristics of large size, shock resistance, humidity resistance, heat resistance, good heat dissipation, and low price. They are widely used in power adapters, audio equipment, audio frequency dividers, instruments, meters, televisions, automobiles and other equipment.

Dimension Of The Cement Resistor 20W

Structure diagram Of The Cement Resistor 20W

The construction of resistor Cement Type Resistors shall be as follow:

Features Of The Cement Resistor 20W

1, shock resistance, moisture resistance, heat resistance and good heat dissipation, low price and other characteristics.
2. Complete insulation, suitable for printed circuit boards.
3. Winding the wire on the porcelain rod and then welding the joint to produce accurate resistance value and prolong life.
4. The high resistance value is made of metal oxide film body (MO) instead of winding.
5. Excellent heat resistance, small temperature coefficient of resistance, and linear change.
6. It is resistant to short-time overload, low noise, and the resistance value has not changed over the years.
7. Good explosion-proof performance and protection.

Shortcoming Of The Cement Resistor 20W

The disadvantage of cement resistance is that it is large in size, has high heat generation during use, is easy to dissipate, and often cannot meet the requirements of precision and stability. For high-power, small-volume resistors, or high precision and fast heat dissipation, cement resistors can be replaced with JEPSUN power resistors, 3W, 20W, 30W, 50W, 100W, and even more power can be achieved, using TO-220 , TO-247 package, high accuracy, strong stability, fast heat dissipation. Cement resistor housings are generally made of ceramics, and their main components are: alumina Al2O3, commonly known as corundum porcelain, which has the characteristics of fast heat dissipation and high strength.

Function Of The Cement Resistor 20W

1: The function of the power supply current limiting, usually connected to the main voltage +300V and the E and C poles of the power switch tube, the function is that the power supply will not damage its components when it is turned on.
2: The starting resistance of the power supply, the resistance between the power tube and the starting circuit is connected to +300V, the voltage drop and current are large, so the cement resistance with high power is also used.
3: The peak pulse absorption circuit between the power switch tubes B, C, and E also uses a high-power cement resistor, which also protects its power switch tube.
4: The current protection circuit is generally connected between the E pole of the power switch tube and the ground. When it is working normally, its resistance can be ignored, because the resistance of the resistance is very small and there is no current, only when the circuit itself and the load are short-circuited. , in order to increase the current of the E pole of the power switch tube, so that the protection voltage is generated at both ends of the resistance to start the related circuit.

Application Of The Cement Resistor 20W

Widely used in power adapters, audio equipment, audio frequency dividers, instruments, meters, televisions, automobiles and other equipment
Cement resistors are usually used in occasions with high power and high current, including 2W, 3W, 5W, 10W or even more power, such as air conditioners, TV sets, and other electrical appliances with power above 100 watts, basically all use cement resistance.

Dongguan Ampfort Electronics Co., Ltd. is a high-tech enterprise specializing in R&D, manufacturing and sales, committed to becoming a comprehensive supplier of circuit protection components.

We introduced advanced quality system,management systems and high-precision automation equipment from Germany, set up multiple production bases and continue to increase product lines. Our team consist of experienced engineers, passionate business elites, and regularly trained skilled workers, which provides a solid foundation for quality assurance and productivity performance. Moreover, our products have passed safety certifications of many countries and are favored by many consumers by years’ unremitting efforts.

We cooperated with universities and colleges, and will continue to research and develop new products , committed to high-quality circuit protection solutions, and provide global customers with efficient technology, products, and testing support to meet their requirements for rapid development of new products. We are gradually updating from "Made In China" to "Created In China" and to "Intelligent Manufacturing In China", from circuit design to product testing, we will provide you with one-stop service in the field of circuit protection.After years of intensive cultivation, we have maintained a good relationship with our peers and have become distributor of many famous electronic component brands to meet the diverse needs of customers.

The main products include: Thermistors, Varistors, Temperature Sensors, Fuses and corresponding Hardware and Plastic accessories, Inductors, Thermal Protector, Overload/Composite Protectors, Discharge Tubes, Photoresistors and Wiring Harnesses etc. Through the combination of different process devices,Ampfort Electronics can meet customers' individual circuit protection requirements. Our products are widely used in: power adapters, switching power supplies, chargers, transformers, computers, telephones, household appliances, communication products, lighting products, toy products, various instruments and various electronic cables, electrical products, IT, Consumer electronics, automobiles, batteries and other fields.

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