Why is a switching type power supply less expensive and lighter than an equivalent linear power supply?
The correct answer is C: The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output. Why is a switching type power supply less expensive and lighter than an equivalent linear power supply is that the high frequency inverter design uses much smaller transformers and filter components for an equivalent power output. High-frequency operation allows smaller components. For amateur radio operators, this is important for power supply design. Understanding this helps when selecting power supplies.
Exam Tip
Switching supply less expensive/lighter = high frequency uses smaller transformers and filter components. Think 'S'witching 'S'upply = 'S'maller 'S'ize (high frequency). High-frequency operation allows smaller components. Not no output filter, not less current, not power recovery - just smaller components due to high frequency.
Memory Aid
"Switching supply less expensive/lighter = high frequency uses smaller transformers and filter components. Think 'S'witching = 'S'maller components. High-frequency operation allows smaller components. Important for power supply design."
Real-World Application
A switching type power supply is less expensive and lighter: It's because the high frequency inverter design uses much smaller transformers and filter components for an equivalent power output. High-frequency operation allows smaller magnetic components. This is the reason - smaller components due to high frequency.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Inverter design not requiring output filter isn't the reason - high frequency allows smaller components. No output filter isn't the reason.
Option B: Incorrect. Control circuitry using less current isn't the reason - high frequency allows smaller components. Less current isn't the reason.
Option D: Incorrect. Recovering power from unused AC cycle portion isn't the reason - high frequency allows smaller components. Power recovery isn't the reason.
题目解析
The correct answer is C: The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output. Why is a switching type power supply less expensive and lighter than an equivalent linear power supply is that the high frequency inverter design uses much smaller transformers and filter components for an equivalent power output. High-frequency operation allows smaller components. For amateur radio operators, this is important for power supply design. Understanding this helps when selecting power supplies.
考试技巧
Switching supply less expensive/lighter = high frequency uses smaller transformers and filter components. Think 'S'witching 'S'upply = 'S'maller 'S'ize (high frequency). High-frequency operation allows smaller components. Not no output filter, not less current, not power recovery - just smaller components due to high frequency.
记忆口诀
Switching supply less expensive/lighter = high frequency uses smaller transformers and filter components. Think 'S'witching = 'S'maller components. High-frequency operation allows smaller components. Important for power supply design.
实际应用示例
A switching type power supply is less expensive and lighter: It's because the high frequency inverter design uses much smaller transformers and filter components for an equivalent power output. High-frequency operation allows smaller magnetic components. This is the reason - smaller components due to high frequency.
错误选项分析
Option A: Incorrect. Inverter design not requiring output filter isn't the reason - high frequency allows smaller components. No output filter isn't the reason. Option B: Incorrect. Control circuitry using less current isn't the reason - high frequency allows smaller components. Less current isn't the reason. Option D: Incorrect. Recovering power from unused AC cycle portion isn't the reason - high frequency allows smaller components. Power recovery isn't the reason.
知识点
Switching type power supply, Less expensive and lighter, Equivalent linear power supply, High frequency inverter design, Much smaller transformers and filter components
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.