Comparison of Step Up and Step Down Choppers

Sr.
No.

Parameter

Step
down Chopper

Step
up Chopper

1.

Range of output voltage.

0 to V Volts

V volts and above

2.

Position of chopper switch

In series with load.

In parallel with load.

3.

Configuration

Refer Figure A.

Refer Figure B.

4.

Expression for output voltage.

V_{L dc} = D x V

Volts

V_O = V / (1-D) Volts

5.

External inductance

Not required

Required for boosting the output voltage.

6.

Use

For motoring operation, for motor load.

For regenerative braking for motor load.

7.

Type of Chopper

Single Quadrant

Single Quadrant

8.

Quadrant of operation

I^st Quadrant

II^nd Quadrant

9.

Application

Motor speed control

Battery charging/voltage boosters.

10.

Waveforms

Refer Figure C.

Refer Figure D.