Dc chopper

Dc chopper
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DC/DC transform is variable DC voltage transform to a fixed DC voltage, also known as DC chopper. The chopper sensor means has two, one is the pulse width modulation way Ts unchanged, change ton (general), 2 it is frequency modulation (1) Buck circuit--the chopper Buck, the output voltage U0 less than average input voltage Ui, the same polarity. (2) Boost circuit--the booster chopped, and its output voltage is greater than the average U0 input voltage Ui, the same polarity. (3) Buck-Boost circuit--step-down or Boost the chopper device, the output voltage U0 or greater than the average less than the input voltage Ui, the reverse polarity, inductance transmission. (4) Cuk circuit--or the chopper boost blood pressure, the average electricity output
The greater or less than the pressure U0 input voltage Ui, the reverse polarity, capacitance transmission. And Sepic, Zeta circuit. The above for the isolation type DC-DC converter circuit, the isolation type DC-DC converter is shock circuit, a flyback circuit, half bridge circuit, the whole bridge circuit, mosfet circuits. Today's soft switch technology makes DC/DC happen a qualitative leap, the United States VICOR company designs the manufacture various ECI soft switch DC/DC converter, and its maximum output power 300 W, 600 W, 800 W, etc, the corresponding power density for (6.2, 10, 17) W/cm3, efficiency as the (80 ~ 90) %. Japan TDK-Lambda company launched a new soft switch technology using high frequency switching power supply module RM series, the switch frequency for (200 ~ 300) kHz, power density has reached W/cm3 27, the synchronous rectifier (MOSFET instead of the schottky diodes), make the whole circuit ? efficiency