(nate Daives 1. What is the function of PPUs? 2. What are the sub-blocks of PPUs
ID: 1766111 • Letter: #
Question
(nate Daives 1. What is the function of PPUs? 2. What are the sub-blocks of PPUs? 3. What are the roles of the rectifier and the filter-capacitor sub-blocks? 4 Qualitatively, how does a switch-mode amplifier differ from a linear amplifier? 5. Why does operating transistors as switches result in much smaller losses compared to operating them in their linear region? 6. How is a bi-positional switch realized in a converter pole 7. What is the gain of each converter pole? 8. How does a switch-mode converter pole approach the output of a linear amplifier? 9, What is the meaning of T(r)? 10. How is the pole output voltage made linearly proportional to the input control signal? 11. What is the physical significance of the duty-ratio, for example d,()? 12. How is pulse-width-modulation (PWM) achieved and what is its function? 13. Instantaneous quantities on the two sides of the converter pole, for example pole-A, are related by the switching signal 90). What relates the average 14. What is the equivalent model of a switch-mode pole in terms of its average 15. How is a switch-mode de-de converter which can achieve an output voltage of 16. What is the frequency content of the output voltage waveform in de-ds quantities on the two sides? quantities? either polarity and an output current flowing in either direction realized? converters? 4-26Explanation / Answer
FIRST QUESTION ANSWERED
1. PPU - Power Processing Unit
These are devices which convert electric input from utility line to a specified voltage and current of the operational device. Its function is similar to linear devices however more efficient since powerloss does not happen due to lack of resistors. This is achieved by using switches to rapidly turn signal on and off which in turn changes the average current and voltage.Because of this it can be used to convert dc and ac voltage and current signals. The practical applications include in spacecraft where it provides electrical power to other parts of space craft which has to cope with various power demands in efficient manner.
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