BZCN Bozhong Electric Co., Ltd. is a manufacturer focusing on tact switches. Its main business: tact switches, patch tact switches, waterproof tact switches, toggle switches, side push tact switches, ultra-thin tact switches, silicone Touch switch, key switch, if you need to switch, please contact us
The lower the output voltage of the touch switch, the greater the influence of the rectifier voltage drop. If the output voltage is below 5V, synchronous rectification must be used to achieve efficiency above 80%. However, synchronous rectification makes the circuit complicated, and at the same time, the driving loss will increase significantly at high frequencies, which limits the improvement of efficiency. When the output voltage increases, the diode reverse recovery loss and snubber circuit loss will increase significantly. The conduction voltage drop of the low output voltage power supply rectifier is the main factor affecting the efficiency of the whole machine. The conduction loss can be estimated by multiplying the forward voltage drop of the diode by the output current.
The filter loss Pf of the touch switch includes filter inductance loss and capacitance loss. If it is a continuous mode inductor, the main loss is the coil loss, and the core loss can be ignored. The capacitor has a loss on the series equivalent resistance Resr. In the inductance continuous mode, the capacitor ripple current is small, the capacitor loss is also small, and the entire filter loss is about less than 1% of the output power. If it is a flyback transformer, the Resr loss of the capacitor is greatly increased, and the filter loss is the capacitor loss. The rectifier circuit loss Pr includes the conduction loss caused by the forward voltage drop of the rectifier, the turn-off loss caused by the reverse recovery, and the snubber circuit loss to avoid the oscillating diode.
Because of its small size, long life, and light touch feeling, it has been widely used in many fields such as household appliances. With the continuous improvement of people's living standards, these household appliances are being updated faster and faster, and the number of their needs will become larger and larger. This is also the direction of the greatest potential for us to be optimistic about its development prospects.