전기전자기초실험 Chapter 5 Battery Tester and Charging Circuit Analysis Pre-report
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- 2011.12.18
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- 2011.10
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2011년 2학기 전기전자기초실험 보고서입니다. 전부 다 영어로 작성되어 있으며, 예비보고서의 경우 주석 충분히 달려 있습니다. 베끼지 않고 작성하여, 이 자료를 쓰셔도 Cheating의 염려가 없습니다.
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본문내용
① Explain the mechanism of Economical battery tester
Economical battery tester is used when confirming the remaining voltage of battery. When LED in the tester lights up in a moment, the battery used in circuit has larger voltage value than specific voltage value. In Fig 5-1, when the switch S1 opens, C1 is charged by UB. And then switch S1 closes, C1 discharges the saved energy through R3 and D1. It makes the light on LED. If voltage is enough to acting transistor, LED is on, and it is not enough to acting transistor, LED goes off.
② Analyze the elements of Economical battery tester and its circuit system.
1) Explain the quality difference in accordance with capacitor.
If capacitor goes larger, there will be take more time to charging the voltage with UB, and take more time to discharging the voltage and LED will keep more time to light on. If capacitor goes smaller, In contrary, less time will be needed to charge and less light-on in LED.
2) Applying the characteristics of transistor, explain the mechanism of circuit system.
A transistor is a device made up of semiconductor, with the form of pnp of npn. Each terminal is called emitter, collector, and base. Current of emitter is the sum of the current of collector and base. Of course base and emitter is a kind of diode, more than 0.7V is needed VBE(voltage between B, E) to flow current. The ratio of R1 and R2 determines VBE and it can decide the lighting state of LED.∙Reference
Transistor [Online]. Available: http://en.wikipedia.org/wiki/Transistor
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