18W passive PFC LED lighting driver design - Power Circuit - Circuit Diagram

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First, the design features

1, very high efficiency: 82%

2, the number of components is small: only 40 components

3. It does not require common mode inductance to meet the requirements of EN55022B for conducted EMI.

4, the valley filling circuit makes the power supply meet the IEC61000-3-2 THD limit

5, ON / OFF control to suppress the higher power frequency ripple voltage caused by the valley filling (THD correction) circuit

Figure 3. Input voltage (100 V/div) and current (100 mA/div) showing the effect of the valley fill circuit