Adopt DC/DC converter of PWM technical control


Posted on Feb 6, 2014

The on-off-type DC/ DC converter has two kinds of operating modes: One kind keeps the switch duty cycle worker constant, the controlled switch turns on time sha. Pulse length modulation PWM of n Way; Ton is constant that another kind keeps turning on time, change the pulse frequency modulation PFM of several of duty cycle of switch Way. Pulse leng


Adopt DC/DC converter of PWM technical control
Click here to download the full size of the above Circuit.

th modulation PWM DC/ DC converter is through controlling the gas switching tube to repeat a kind of direct-current volts electric current once of operating mode of the ON/OFF Transform high-frequency the intersection of rectangular wave and voltage to Electric current, And then turn into another direct-current volts after commutating Fructus Mali pumilae Electric current Output. PWM DC/ DC converter made up of power gas switching tube, kenotron, smoothing circuit and PWM controlling circuit, etc. Its input, exporting one while needing to carry on the electrical isolation, can adopt the voltage transformer to isolate and rise, step down. The operating principle of PWM DC/ DC converter is shown as in Fig. 1. Because of the improvement of the operating frequency of the switch, magnetic elements such as filtering inductor L, voltage transformer T, etc. and Filtering capacitance C, etc. can be by miniaturization. PWM DC/ DC invariable generally in switching frequency of converter, control sample of signal as follows, output voltage, input voltage, output current, outputting inductance voltage, switching element crest current. Can form monocyclic ring, double ring or multiloop feedback system by these signals, in order to realize the purposes of voltage regulation, current regulator and invariable power, can realize the function of some subsidiary overcurrent protection, resisting magnetic biasing, flowing etc. at the same time....




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    audio white noise generator
    Touch Switch with MPF102 JFET
    Ir-Controlled Soldering Station
    Block Diagram of the CT Scanner
    Electronic Thermostat and Relay Circuit
    FM receivers with PLL
    Table circuit voltage electric lines
    One-way operation of a dynamic braking circuit



    Top