- #1
rama1001
- 132
- 1
It is very basic and makes me angry because i did not understand exactly what does switching frequency means and why is the duty if this in SMPS?
Cany one explaine me clearly?
Cany one explaine me clearly?
What does switching frequency means and I saw some products which display in their manual like switching frequency is 500kHZ etc..what exactly it specifies. Please I am new this topics.Averagesupernova said:I don't fully understand your question but I will reply. Generally the higher the frequency the physically smaller a transformer can be built. A tranformer operates most efficiently at 50% duty cycle. Of course the SMPS in question may not even use a transformer. Please elaborate.
Switch Frequency in SMPS (Switched-Mode Power Supply) refers to the rate at which the power switch in the SMPS circuit turns on and off. It is measured in Hertz (Hz) and typically ranges from a few hundred Hz to several hundred kHz.
Switch Frequency is important in SMPS because it affects the overall performance and efficiency of the power supply. A higher switch frequency allows for smaller and lighter components, but also increases switching losses and electromagnetic interference (EMI). A lower switch frequency reduces these losses but can result in larger and heavier components.
The output voltage of an SMPS is inversely proportional to the switch frequency. This means that as the switch frequency increases, the output voltage decreases. This is because a higher switch frequency results in shorter on and off times for the power switch, reducing the amount of energy transferred to the output.
Duty Cycle in SMPS refers to the ratio of the on time to the total period of the power switch. It is expressed as a percentage and determines the average output voltage of the SMPS. A higher duty cycle results in a higher average output voltage and vice versa.
Duty Cycle and Switch Frequency are inversely related in SMPS. As the switch frequency increases, the duty cycle decreases, resulting in a lower average output voltage. Similarly, a lower switch frequency results in a higher duty cycle and higher average output voltage.