The main differences between LED switching power supplies and ordinary switching power supplies are as follows:
Voltage Output Characteristics:
LED Switching Power Supplies: Their voltage output is typically a multiple of 3.2V, such as 3.2V, 6.4V, 9.6V, etc., and generally does not exceed 25.6V. This is to avoid instantaneous burnout of the LED due to excessive voltage when turning it on. Furthermore, this voltage varies with the load to achieve constant current output.
Ordinary Switching Power Supplies: Their voltage output range is wider and usually remains constant, not adjusting with load changes.
Output Current Characteristics:
LED Switching Power Supplies: The output current is constant to maintain stable LED illumination and avoid current fluctuations caused by changes in the LED characteristic curve. Although there may be slight current variations due to component precision limitations, this variation is an important parameter for evaluating the quality of the driver circuit.
Ordinary Switching Power Supplies: The output current may vary with the load and is not necessarily constant.
Startup Method:
LED Switching Power Supplies: Typically use a soft-start method to avoid defects caused by poor LED consistency and instantaneous changes in the activity of the internal PN junction when conducting.
General switching power supplies: Startup methods may vary depending on the application and soft-start is not always necessary.
Circuit complexity:
LED switching power supplies: Circuits should be as simple as possible to accommodate the space constraints of LED lighting products and reduce costs and energy consumption.
General switching power supplies: Circuit complexity may vary depending on application requirements and a minimalist design is not always necessary.
Isolation requirements:
LED switching power supplies: Isolation is generally not required because many LED lighting products have structures similar to general lighting fixtures, and safety considerations can be similar. However, this is not absolute; some LED drivers still require isolation.
General switching power supplies: Isolation requirements may vary depending on the application, depending on safety standards and design specifications.
In summary, LED switching power supplies differ significantly from general switching power supplies in terms of voltage output, output current, startup methods, circuit complexity, and isolation requirements. These differences make LED switching power supplies more suitable for driving LED lighting products.
