DC - DC (DC / DC) converter.

DC - DC (DC / DC) converter.

 

DC / DC converter to a fixed DC voltage is transformed into a variable DC voltage, this technique is widely used in electric trolley buses, subway trains, electric cars, variable speed and control, while allowing access to these controls to accelerate a smooth, quick response performance, and also received the effect of saving energy.

 

Replace the rheostat with a DC chopper can save energy (20 ~ 30)%. DC chopper can not only play the role of regulator (switching power supply), but can also effectively suppress the grid side harmonic current noise.

 

Communication power of the secondary power supply DC / DC converter has been commercialized, the module uses high-frequency PWM technology, the switching frequency is about 500kHz, the power density is 5W ~ 20W/in3. With the development of large scale integrated circuits, power supply module requires small, so we must constantly improve the switching frequency and a new circuit topology, there are some companies develop and produce a zero-current switching and zero voltage switching technology, the second  power module, power density have a more substantial increase.