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Boost converters boost the input voltage higher

Circuit Diagram Edit

TydPicture 1

Analysis Edit

V_dDT_s = V_0T_S(1-D) \frac{V_o}{V_D} = \frac{D}{1-D}

Boundary between dis and cts ConductionEdit

Discontinuous conduction mode is the preferred method of operation for a buck-boost converter. I_{LB} = \frac{V_dT_sD}{2L}

note V_d = \frac{V_o(1-D)}{D} & I_o = I_L - I_d average current through inductor equates to the current through the inductor minus that which flows back to the source. The capacitor has zero average current.

\therefore I{oB} = \frac{V_o(1-D)^2T_s}{2LD}

Output Voltage Ripple Edit

The diode current i_D carries both the ripple current from capacitor and the average current through the load. Hence \Delta V_o = \frac{\Delta Q}{C} = \frac{I_o D T_s}{C} = \frac{V_oDT_S}{RC}

Practical Considerations and Ratings Edit

Transformer Considerations Edit

Switch Ratings Edit

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