The characteristics of RCC circuit are simple, few components, no need for auxiliary power supply and self-driving. This kind of circuit is often used in flyback circuit, but it has more advantages when used in Buck circuit, regardless of leakage inductance and transformer design.

LED can be regarded as a constant load (with small variation range), which is easy to control with RCC circuit, and RCC is also good at realizing constant current output (no power frequency ripple after constant current).

Buck circuit needs to use inductance, and the inductance is inversely proportional to the frequency when the power is constant. Choosing the right frequency can give consideration to both performance and cost. These characteristics show that RCC+Buck is an ideal LED driving circuit.

Extended data:

Test whether the LED driving power supply can rotate the black-and-white gyroscope in the sun without stroboscopic light, and the pattern will form a stable annular color ring, which will not change with the rotation speed and direction. Under the test light, turn the black-and-white gyroscope and observe the phenomenon:

If the color or ring structure of the pattern changes, it means that the illumination has stroboscopic changes, and the more obvious and intense the stroboscopic changes are. However, it is impossible to make an accurate evaluation of the gating depth.

Human eyes are insensitive to flicker above 60Hz, and the power frequency of the output end of LED constant current power supply is generally 100Hz and above. When you take a picture of the lamp with a camera or mobile phone, you can see wavy black stripes. The test method of LED lighting is not necessarily accurate, but it is a relatively simple and commonly used test method.

There is really no stroboscopic, which can be verified by relevant test equipment. You can look at the equipment test data.

References:

Baidu encyclopedia dominates