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3. A step-up chopper is to provide a 48V across a 12Y-load from a 12V d.c. supply. The chopper inductance is 10tzH and the chopper frequency is 100kHz. Determine the duty cycle required and the variation of battery current during switching, and the maximum and minimum battery currents

3. A step-up chopper is to provide a 48V across a 12Y-load from a 12V d.c. supply. The chopper inductance is 10tzH and the chopper frequency is 100kHz. Determine the duty cycle required and the variation of battery current during switching, and the maximum and minimum battery currents

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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H.W. for third Students 1. A d.c. series motor is controlled by a chopper. Drive parameters are as follows: (Ra + Rf) = 0.12 kv = 10 mV/A-rad/s Vb = 96V f= 125HZ (a) With an armature torque of 5Nm, the speed is 1500rev/min. What are the values of armature current and turn-on time? (b) The shaft torque is increased to 20NM and the chopper on-time increased to hold the armature speed at 1500rev/min. What is the new armature current and on-time? 2. A 60V chopper drives a resistive load of 121L The chopper frequency is set to 1 kHz. Calculate the values of average and rms load currents and load power for a turn-on time of (a) 0.2ms, (b) 0.6ms. 3. A step-up chopper is to provide a 48V across a 12Y- load from a 12V d.c. supply. The chopper inductance is 10tzH and the chopper frequency is 100kHz. Determine the duty cycle required and the variation of battery current during switching, and the maximum and minimum battery currents
Transcribed Image Text:H.W. for third Students 1. A d.c. series motor is controlled by a chopper. Drive parameters are as follows: (Ra + Rf) = 0.12 kv = 10 mV/A-rad/s Vb = 96V f= 125HZ (a) With an armature torque of 5Nm, the speed is 1500rev/min. What are the values of armature current and turn-on time? (b) The shaft torque is increased to 20NM and the chopper on-time increased to hold the armature speed at 1500rev/min. What is the new armature current and on-time? 2. A 60V chopper drives a resistive load of 121L The chopper frequency is set to 1 kHz. Calculate the values of average and rms load currents and load power for a turn-on time of (a) 0.2ms, (b) 0.6ms. 3. A step-up chopper is to provide a 48V across a 12Y- load from a 12V d.c. supply. The chopper inductance is 10tzH and the chopper frequency is 100kHz. Determine the duty cycle required and the variation of battery current during switching, and the maximum and minimum battery currents
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