You are tasked with designing a defibrillator with the following specifications: a) The defibrillator is modelled...
You are tasked with designing a defibrillator with the following specifications:
a) The defibrillator is modelled as a simple 1st order LTI system. The resistor in the charging circuit is 20k ohm.
b) Charging time (from “empty”) is no more than 4 s from the moment the “charge” button is pressed to be within 2% of full charge value.
c) The system allows the delivery of either 50, 75 or 125 J of energy to the patient.
d) The patient is modelled as a 50 ohm resistor.
Calculate the following:
i) Draw one or two circuit(s) representing the 2 situations: charging the capacitor and discharging (defibrillating the patient’s heart).
ii) What size capacitor is needed to achieve these specifications?
iii) Calculate the voltage supply needed to deliver the different amounts of energy specified above.
iv) How long does it take to deliver 99% of the charge to the patient? Hint: energy is the integration of power.
v) Calculate the current flowing through the patient for each energy level as a result of defibrillation.
Homework Answers
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You are tasked with designing a defibrillator with the following
specifications:
a) The defibrillator is modelled...
1. Calculate amount of charge stored on the capacitor after it has been charging for 1.10s. 2. The fraction of charg...
1. Calculate amount of charge stored on the capacitor
after it has been charging for 1.10s.
2. The fraction of charge remaining on the capacitor 1.00ms after
it begins discharging is 0.300. Calculate the resistance of the
patient.
The defibrillator uses a capacitor to store the charge that will be delivered in the current. The capacitor forms part of an RC-circuit, as shown in the diagram below: The capacitance of the capacitor is 29.4 μF and the resistance of the...
ans, RA = 721.5 kohms, RB = 360.8 kohms, R3 = 3.5kohms as an example solution. Question 7 (6 marks) You have been given...
ans,
RA = 721.5 kohms, RB = 360.8 kohms, R3 = 3.5kohms as an example
solution.
Question 7 (6 marks) You have been given a 555 Timer, an LED with Von 2V, a 9V battery that can comfortably supply 5mA of current without loss of voltage, a 1 μF capacitor and access to any resistor values you want. You are to design a circuit that causes the LED to flash periodically once per second with a duty cycle of 75%....
Hi, Can you please solve these problems. For the information below to answer Questions 1-5. An...
Hi, Can you please solve these problems. For the information below to answer Questions 1-5. An electronic flashgun has a 2500 μF electrolytic capacitor charged to 300 V and a current-limiting 10 kΩ resistor and. If the lamp resistance is 10 Ω: Question 1 Find the peak charging current [2] 1) 30 A 2) 15 mA 3) 30 mA 4) 20 A Question 2 Find the time required for the capacitor to fully charge (Hint: an electronic flash unit is...
14) Which of the following is NOT a typical electrical component? A) Resistor B) Capacitor C)...
14) Which of the following is NOT a typical electrical component? A) Resistor B) Capacitor C) Megatron Inductor E) Transformer D) 23) Convert 6.8 x 10-5 W to the closest standard metric prefix. A) 68 °W B) 0.68 uW C) 680 uW D) 6.8 uw 24) Convert 3.95 x 10-4 A to the closest standard metric prefix. A) 3.95 mA 39.5 mA 0.395 mA D 395 mA Convert the following: 25) 2 x 10-3 Amp = A) 2 microamps 2...
1. Calculate amount of charge stored on the capacitor
after it has been charging for 1.10s.
2. The fraction of charge remaining on the capacitor 1.00ms after
it begins discharging is 0.300. Calculate the resistance of the
patient.
The defibrillator uses a capacitor to store the charge that will be delivered in the current. The capacitor forms part of an RC-circuit, as shown in the diagram below: The capacitance of the capacitor is 29.4 μF and the resistance of the...
ans,
RA = 721.5 kohms, RB = 360.8 kohms, R3 = 3.5kohms as an example
solution.
Question 7 (6 marks) You have been given a 555 Timer, an LED with Von 2V, a 9V battery that can comfortably supply 5mA of current without loss of voltage, a 1 μF capacitor and access to any resistor values you want. You are to design a circuit that causes the LED to flash periodically once per second with a duty cycle of 75%....
14) Which of the following is NOT a typical electrical component? A) Resistor B) Capacitor C) Megatron Inductor E) Transformer D) 23) Convert 6.8 x 10-5 W to the closest standard metric prefix. A) 68 °W B) 0.68 uW C) 680 uW D) 6.8 uw 24) Convert 3.95 x 10-4 A to the closest standard metric prefix. A) 3.95 mA 39.5 mA 0.395 mA D 395 mA Convert the following: 25) 2 x 10-3 Amp = A) 2 microamps 2...
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