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LED Driving Mode
|The input of LED driving power includes high voltage power frequency AC (i.e. city power), low voltage DC, high voltage DC, low voltage high frequency AC (e.g. output of electronic transformer), etc.
1. Classified by driving mode: (1) Constant current type (2) Voltage stabilization type
2. Classification by circuit structure
(1) Resistance and capacitance step-down mode (2) Resistance step-down mode (3) Conventional transformer step-down mode (4) Electronic transformer step-down mode (5) RCC step-down mode switching power supply (6) PWM control mode switching power supply
LED is generally static current and dynamic, but as far as I am concerned, constant current accounts for the majority.
When choosing and designing the LED driving power supply, we should take into account: 1. High reliability 2. High efficiency 3. High power factor 4. There are two kinds of driving modes: one is a constant voltage source for multiple constant current sources, and each constant current source provides power to each LED separately. The other is direct constant current power supply, LED series or parallel operation. It has the advantage of low cost, but poor flexibility, but also to solve a certain LED fault, do not affect the operation of other LED problems. These two forms coexist for a period of time. Multi-channel constant current output power supply mode will be better in cost and performance. Maybe it will be the mainstream direction in the future. 5. Surge protection 6. Protection function 7. External installation of protective lighting, power structure to be waterproof, moisture-proof, the shell to be sun-resistant. 8. The life of driving power supply should be matched with that of LED. 9. To meet the requirements of safety regulations and electromagnetic compatibility.