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Contact side |(controlled) circuit Relay Arduino 6V digital pin RB in 10 P2N222A 5V Arduino GND pin

Contact side |(controlled) circuit Relay Arduino 6V digital pin RB in 10 P2N222A 5V Arduino GND pin

Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.4P
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Problem 2: Consider controlling the Omron G5LE-1 5VDC power relay, shown below, using an Arduino in the following circuit. A relay has windings that when energized cause a magnetic field, which mechanically closes the contact side of the relay, so it acts as an electronically controlled switch. One benefit of a relay is that the switch on the contact side is electrically isolated from the coil on the control side of the relay. This advantage of electrical isolation comes at a cost. Relays do not switch states quickly like transistors. Based on its data sheet, the Omron G5LE-1 5VDC has a coil resistance of 63N (at DC, consider the coil side of the relay as a resistor). Select the base resistance to ensure the P2N222A BJT is deep into saturation when the relay is energized (meaning current is flowing through its windings). o Note: It is safe to operate the Omron G5LE-1 at up to 130% of its rated voltage of 5VDC in its entire operating temperature range. Assume VcE sat = 0.2V for the BJT. o Note: The diode across the relay serves a similar purpose as the ones in the H-Bridge circuit. In this case when the relay coil is de-energizing, the current circulates through the diode and back through the relay coil in a loop as it dissipates. It does not affect the analysis though in this problem. o Hint: Attain the minimum DC current gain from the hfe figure in Example L??-1, and apply a design factor of 2 on the base current to ensure the BJT is deep into saturation. omRon cakec Contact ASOVAC side Relay (controlled) circuit 6V Arduino digital pin RB iR 10 P2N222A 5V Arduino GND pin • Answer: Rg = 12002
Transcribed Image Text:Problem 2: Consider controlling the Omron G5LE-1 5VDC power relay, shown below, using an Arduino in the following circuit. A relay has windings that when energized cause a magnetic field, which mechanically closes the contact side of the relay, so it acts as an electronically controlled switch. One benefit of a relay is that the switch on the contact side is electrically isolated from the coil on the control side of the relay. This advantage of electrical isolation comes at a cost. Relays do not switch states quickly like transistors. Based on its data sheet, the Omron G5LE-1 5VDC has a coil resistance of 63N (at DC, consider the coil side of the relay as a resistor). Select the base resistance to ensure the P2N222A BJT is deep into saturation when the relay is energized (meaning current is flowing through its windings). o Note: It is safe to operate the Omron G5LE-1 at up to 130% of its rated voltage of 5VDC in its entire operating temperature range. Assume VcE sat = 0.2V for the BJT. o Note: The diode across the relay serves a similar purpose as the ones in the H-Bridge circuit. In this case when the relay coil is de-energizing, the current circulates through the diode and back through the relay coil in a loop as it dissipates. It does not affect the analysis though in this problem. o Hint: Attain the minimum DC current gain from the hfe figure in Example L??-1, and apply a design factor of 2 on the base current to ensure the BJT is deep into saturation. omRon cakec Contact ASOVAC side Relay (controlled) circuit 6V Arduino digital pin RB iR 10 P2N222A 5V Arduino GND pin • Answer: Rg = 12002
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