Question
Download Solution PDFThe efficiency of direct coupled class B Power amplifier is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- In Power amplifiers, the improved output ac power level is the result of a transfer of energy from the applied dc supplies.
- It is the applied dc power that permits an ac power output to be greater than the input ac power. In other words, there is an "exchange" of dc power to the ac domain that results in higher output ac power.
- Conversion efficiency is defined as:
\(\eta = \frac{P_{o(ac)}}{P_i(dc)}\)
Po(ac) is the ac power to the load
Pi(dc) is the dc power supplied.
For a class B power amplifier maximum theoretical maximum efficiency is 78.5 %
|
Power Amplifier |
Conduction Angle |
Maximum Efficiency |
|
Class A |
360 ° |
50 % |
|
Class B |
180 ° |
78.5 % |
|
Class AB |
180 ° - 360 ° |
50-78.5 % |
|
Class C |
< 180° |
≥ 90% |
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