The primary feedback AC/DC control technology is a new AC/DC control technology developed in the past 10 years. Compared with the traditional secondary feedback optocoupler plus 431 structure, the biggest advantage is that the two chips are omitted. A set of components that work with it, which saves space on the system board, reduces costs, and increases system reliability. It has broad application prospects in markets with high cost pressures such as mobile phone chargers and LED drives and other markets with high volume requirements.
After eliminating this set of components, in order to achieve high-precision constant current / constant voltage (CC / CV) characteristics, it is necessary to adopt new technology to monitor real-time changes in load, power supply and temperature, and the same batch of components. Sub-tolerance, which involves primary (primary) regulation technology, transformer tolerance compensation, cable compensation and EMI optimization techniques.
The principle of primary regulation is to detect information about load changes by accurately sampling the voltage change of the auxiliary winding (NAUX). When the controller turns on the MOS transistor, the transformer primary winding current ip rises linearly from 0 to ipeak, the formula is
Indicates that VCS is the voltage on the CS pin. The meaning of other parameters is shown in Figure 1. This is how the constant voltage (CV) mode works.
Where C1 is a constant less than 0.5 and VCSLMT is the CS pin voltage limit.
After the ratio of the demagnetization time to the switching period is kept constant, the output voltage and current are independent of the inductance value of the transformer, thus reducing the requirement of the application scheme for the consistency of the inductance of the same batch on the practical level. , thereby reducing the cost of large-scale production processing.
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