Diode Bridge Rectifiers

Question 1

What does a diode bridge rectifier do?

Answer 1

> It converts AC to DC

> It is uncontrolled so the output voltage is uncontrolled

Question 2

What is the circuit for a diode bridge rectifier?

Answer 2

[Picture12]

Question 3

Draw the graphs for V_S, V_O, I_O, I_S for a diode bridge rectifier with a resistive load

Answer 3

[Picture13]

Question 4

For this circuit, what happens when V_S is:

Top: +

Bottom: -

[Picture12]

Answer 4

> D₁ and D₄ are conducting

> Voltage flows through the load in a clockwise direction.

Question 5

For this circuit, what happens when VS is:

Top: -

Bottom: +

[Picture12]

Answer 5

> D₂ and D₃ are conducting

> Voltage flows through the load in a clockwise direction.

Question 6

What is the issue with a diode bridge rectifier?

Answer 6

The power cannot be regulated

Question 7

What is the equation for power for a diode bridge rectifier?

Answer 7

P = V_O × I_O

Question 8

What is the equation for the average output voltage?

Answer 8

V_Oavg = 1/π ∫₀^π v_S dt

Question 9

What does a highly inductive load do to the output waveform?

Answer 9

> An inductor is normally used to improve the output current waveform

> If the inductor the inductor is sufficiently large (≈ ∞)then the output current constant.

Question 10

Draw the graphs for V_S, V_O, I_O, I_S for a diode bridge rectifier with an inductive load

Answer 10

[Picture14]