Question

You are to design a simple power supply made up of recycled electrical parts to drive a motor. To simplify the design, you can model the running motor as a load resistor. The motor is rated for 20V and draws 10mA when running. 120Vrms 60Hz Resistor 3.75 1250pF Zener Motor If you were to model the running motor as a resistor, what would the resistor value be? The transformer has a turns ratio of 3.75. What are the RMS and peak values of the secondary voltage? What is the peak voltage after the diode rectifier bridge (without C1, Zener, resistor, or load)? Draw the waveform. Determine the ripple voltage (Vripple) without the Zener diode in the circuit. Assume the resistor above is 100Ω. Determine the part number of a suitable Zener diode to provide an output voltage of approximately 20V. (i.e. IN4)

          You are to design a simple power supply made up of recycled electrical parts to drive a motor. To simplify the design, you can model the running motor as a load resistor. The motor is rated for 20V and draws 10mA when running.

120Vrms 60Hz
Resistor
3.75
1250pF
Zener
Motor

If you were to model the running motor as a resistor, what would the resistor value be? The transformer has a turns ratio of 3.75. What are the RMS and peak values of the secondary voltage? What is the peak voltage after the diode rectifier bridge (without C1, Zener, resistor, or load)? Draw the waveform. Determine the ripple voltage (Vripple) without the Zener diode in the circuit. Assume the resistor above is 100Ω. Determine the part number of a suitable Zener diode to provide an output voltage of approximately 20V. (i.e. IN4)

Added by Brandy C.

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