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Experiment # 7

Input. Filter. Regulation. Load. Experiment # 7. EE 312 Basic Electronics Instrumentation Laboratory Wednesday, October 25, 2000. Objective:.

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Experiment # 7

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  1. Input Filter Regulation Load Experiment # 7 EE 312 Basic Electronics Instrumentation Laboratory Wednesday, October 25, 2000

  2. Objective: • Design, construct, and test a dc power supply. The power supply includes a transformer, diodes, and a filter. All were investigated in previous experiments. This the major design project in the course.

  3. Input: 120 VAC RMS, 60 Hz Steps the input voltage up and down as needed Convert the ac to a pulsing dc Low-pass type for removing voltage variation Keeps voltage constant regardless of load change DC-VOLTAGE POWER SUPPLY OPERATION Alternator or Power Company Load Transformer Rectifier Filter Regulator v t

  4. Power Company v 167 118 Vrms 16.7 ms or 60Hz t Load Transformer Rectifier Filter Regulator

  5. Alternator or Power Company v 25.5 18 Vrms 16.7 ms or 60Hz t Load Transformer Rectifier Filter Regulator v 118 Vrms 167 16.7 ms or 60Hz t

  6. Alternator or Power Company v RLoad t half-wave rectifier Load Transformer Rectifier Filter Regulator 60Hz 120Hz v t RLoad full-wave rectifier

  7. Alternator or Power Company v 18 Vrms 25.5 16.7 ms or 60Hz t Load Transformer Rectifier Filter Regulator v 60 Hz ~ 0.6V 24.9 12.45 Vrms t t half-wave rectifier

  8. Input Filter Regulation Load stage 1 stage 2 Alternator or Power Company Load Transformer Rectifier Filter Regulator

  9. v v ripple Vmax t t t t Input Filter Regulation Load C stage 1 without C with C

  10. ? v Vmax ? ripple VDC 0 t t

  11. Input Filter Regulation Load R C Vinput stage 2 One or more filter sections are usually used to reduce the amplitude of the ripple. The filter used in this experiment is a single-section low-pass RC filter.

  12. Alternator or Power Company Load Transformer Rectifier Filter Regulator We design and built a 12 V dc regulated power supply. In this experiment you use a Zener diode that breaks down at 12 V.

  13. Forward Characteristics 12Volts breakdown voltage ID VD Reverse Characteristics ~ ~ IMax IDC ILoad Iz Iz

  14. Rs IDC ILoad RLoad Rz Iz ID VD ~ ~ IMax Voltage Divider IDC Rs ILoad = Vinput Rz RLoad Iz

  15. Summary Alternator or Power Company Load Transformer Rectifier Filter Regulator v t

  16. Procedures: I- Design, construct, and test a dc power supply. Week 1 II- Simulate dc power supply. Week 2

  17. Components: • 18 Volts Transformer • Variac • Bridge rectifier (use 1 diode) • Zener diode (Vbd=12Vdc, 1N4742) • 12 Watt, 1000 Ohm, variable resistor • 2 Resistor Substitution Boxes • 50, 100, and 200 F Fixed Capacitors

  18. R? R? ILoad = ? VLoad =12 V dc R? C? C? Peak to peak ripple voltage from the input stage = ? Peak to peak ripple voltage at the load = ? 1- Design, construct, test a dc power supply

  19. Vmax = 24.9 v ripple VDC=22.4 V Vmin=19.92 0 t t 20% ripple

  20. 2- Simulation of Part I Simulate the dc power supply! Show output wave form at points 1, 2, and 3. Comnpare these waveforms with your experiment. 1 2 3

  21. Transformer ? RF=100 Rs=100 VLoad =12 V dc CI=250uF CF=100uF Iz=10.5mA 18.0 V 118.4 V variable Variac

  22. Report is required Electronic & Paper Before 1 PM Tuesday Nov. 21

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