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Problem 2: Consider controlling the Omron G5LE-1 5VDC power relay, shown below, using 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 632 (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). onerate the Omron G5LE-1 at up to 130% of its rated voltage of 5VDC in its

Problem 2: Consider controlling the Omron G5LE-1 5VDC power relay, shown below, using 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 632 (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). onerate the Omron G5LE-1 at up to 130% of its rated voltage of 5VDC in its

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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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 63Ω (at DC, consider the coil side of the relay as a resistor). Select the base resistance to ensure the P2N2222A BJT is deep into saturation when the relay is energized (meaning current is flowing through its windings). - **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 \(V_{CE_{sat}} \approx 0.2V\) for the BJT. - **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. - **Hint:** Attain the minimum DC current gain from the \(h_{FE}\) figure in Example L??-1, and apply a design factor of 2 on the base current to ensure the BJT is deep into saturation. **Diagram Explanation:** The diagram shows a circuit with an Arduino connected to a relay through a resistor (\(R_B\)) and a transistor (P2N222A). The relay coil is connected to the Arduino digital pin 10 and the Arduino ground pin. A diode is placed across the relay coil for back EMF protection. The controlled circuit is powered by a 6V source. **Answer:** \(R_B \approx 1200\Omega\)
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 63Ω (at DC, consider the coil side of the relay as a resistor). Select the base resistance to ensure the P2N2222A BJT is deep into saturation when the relay is energized (meaning current is flowing through its windings). - **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 \(V_{CE_{sat}} \approx 0.2V\) for the BJT. - **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. - **Hint:** Attain the minimum DC current gain from the \(h_{FE}\) figure in Example L??-1, and apply a design factor of 2 on the base current to ensure the BJT is deep into saturation. **Diagram Explanation:** The diagram shows a circuit with an Arduino connected to a relay through a resistor (\(R_B\)) and a transistor (P2N222A). The relay coil is connected to the Arduino digital pin 10 and the Arduino ground pin. A diode is placed across the relay coil for back EMF protection. The controlled circuit is powered by a 6V source. **Answer:** \(R_B \approx 1200\Omega\)
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