Operating characteristics of the RCC line - Power Circuit - Circuit Diagram

The starting power of the RCC circuit is related to the switching frequency of the starting state, and the switching frequency is related to the gate capacitance of the main switching tube, that is, the time constant of the gate capacitance and the starting resistance determines the starting frequency. Therefore, the supervisor uses different Mosfets to have different starting performance.

The RCC circuit operates in DCMBoundary mode, so the switching frequency is inversely proportional to the output power and proportional to the input voltage. If the burning phenomenon occurs at low input and high output power, it should be that the switching frequency is too low and the transformer is saturated due to excessive opening time. Therefore, the design of the RCC circuit is designed according to the conditions of the minimum input voltage and the maximum output power. As long as the transformer is not saturated under this working condition, the circuit generally does not have a problem.