Performance Parameters of Rectifiers (Output dc side)

The output of rectifier has both dc and ac components. The performance of rectifiers are evaluated using the followingparameters:

The average value of output (load) voltage given as V_dc

The average value of output (load) current given by I_dc

The output dc power given by P_dc = V_dcI_dc

The rms value of output voltage given as V_rms

The rms value of output current given as I_rms

The output ac power given by Pac = V_rmsI_rms

The efficiency or rectification ratio of a rectifier given by

$\eta = \frac{{{P_{dc}}}}{{{P_{ac}}}}$

The output voltage consists of two components an ac component and a dc component. The effective or (rms) value of the ac component of output voltage is given by

${V_{ac}} = \sqrt {V_{rms}^2 - V_{dc}^2}$

The form factor which is a measure of the shape of the output voltage is given by

$FF = \frac{{{V_{rms}}}}{{{V_{dc}}}}$

The ripple factor which is a measure of the ripple content is given by

$RF = \frac{{{V_{ac}}}}{{{V_{dc}}}}$

By substituting the equation for the effective value of the qac component of the output voltage into the ripple factor equation, we can express the ripple factor as

$RF = \frac{{{V_{ac}}}}{{{V_{dc}}}} = \sqrt {{{\left( {\frac{{{V_{rms}}}}{{{V_{dc}}}}} \right)}^2} - 1} = \sqrt {F{F^2} - 1}$

The transformer utilization factor is defined as

$TUF = \frac{{{P_{dc}}}}{{{V_S}{I_S}}}$

where Vs and Is are the rms voltage and current of the transformer secondary

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Performance Parameters of Rectifiers (Output dc side)

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