Low cost non-isolated 12V LED driver design

First, the design features

1. Accurate primary side constant voltage/constant current controller (CV/CC) eliminates optocoupler and all

2. Secondary side CV/CC control circuit

3, the highest efficiency can be achieved without current detection resistor

4. Use less component and low cost solution (16 components)

5, automatic restart for output short circuit and open loop protection

6, very high energy efficiency

7. Full load efficiency is greater than 80% over the entire input voltage range

8. No-load power consumption <200 mW at 265 VAC input

9. Easily meet EN55015 and CISPR-22 Class B EMI standards

10. Meet ENERGY STAR requirements for solid state lighting (SSL) products

11, green packaging: halogen-free and RoHS compliant

Second, the circuit schematic

Figure 1. 4.2 W LED Driver Designed with LNK605DG


 Circuit Breaker is an electrical device used in an electrical panel that monitors and controls the amount of amperes (amps) being sent through the electrical wiring. Circuit breakers come in a variety of sizes. For instance, 10, 15 and 20 amp breakers are used for most power and lighting needs in the typical home. Some appliances and specialty items (washers, dryers, freezers, whirlpools, etc.) will require a larger circuit breaker to handle the electrical load required to run that appliance.

Circuit Breaker is composed of 4 parts, Ie. , the insulating case, operating mechanism, contact system and tripping device, featuring quick make and break and free trip. The types of common circuit breaker are: Miniature Circuit Breaker /MCB,Residual Current Circuit Breaker /RCCB,Leakage Circuit Breaker,RCBO, Moulded Case Circuit Breaker /MCCB. As a largest Circuit Breaker manufacturers in china, Korlen electrical produces Circuit Breaker more than 3 million monthly.



Circuit Breaker

Mini Circuit Breaker:

rame class

63A

Rated working voltage

240V/415V

Rated frequency

50/60Hz

Rated working current

1, 3, 6, 10, 16, 20, 25, 32, 40, 50, 63A

Making and breaking capacity

6000A(6~40A), 4500A(50, 63A)

Release type

B, C, D

Poles

1, 2, 3, 4P

Mechanical life

20000

Electric life

4000


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Circuit Breaker

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Wenzhou Korlen Electric Appliances Co., Ltd. , http://www.korlenelectric.com