2/27/2023 0 Comments Max power transee![]() ![]() This verifies the Thévenin theorem.įigure 6: Thévenin equivalent construction. Using the meter-source tool, connect channel CA for the VTH source and set the value to what you measured for VTH in Step c.į) With RL set to the 1.5 kΩ used in Step b, measure the VL for the equivalent circuit and compare it to the VL obtained in Step b. Create the value of RTH using a series and or parallel combination of resistors from your parts kit. Make sure there is no power applied to the circuit before measuring with the ohmmeter and that the ground connection has been moved as shown.įigure 5: Measuring the Thévenin Resistance, RTH.Į) Obtaining VTH and RTH, construct the circuit of Figure 2. Use the ALM1000 ohmmeter tool to measure the resistance looking into the opening where RL was. See Figure 4.įigure 4: Measuring the Thévenin Voltage.ĭ) Find RTH: Remove the source voltage VS and construct the circuit as shown in Figure 5. VOC will be the difference between CA volts and CB volts. Use the voltmeter tool by connecting channel CA to the positive node of VOC and connect channel CB to the negative node. This value will later be compared to the one you will find using the Thévenin equivalent.Ĭ) Find VTH: Remove the load resistance, RL, and measure the open circuit voltage, VOC, across the terminals. VL will be the difference between CA volts and CB volts. Use the voltmeter tool by connecting channel CA to the positive node of VL and connect channel CB to the negative node. The Procedure for Verifying Thévenin's TheoremĬonstruct the circuit of Figure 2 using the following component values:ī) Accurately measure the voltage VL across the load resistance using the ALM1000 voltmeter tool. In terms of a Thévenin equivalent circuit, maximum power is delivered to the load resistance RL when RL is equal to the Thévenin equivalent resistance, RTH, of the circuit. ![]() The maximum power transfer theorem states that an independent voltage source in series with a resistance, RS, or an independent current source in parallel with a resistance RS delivers a maximum power to the load resistance, RL, when RL = RS. Figure 2: Thévenin Equivalent Circuit of Figure 1. ![]() The theorem also helps to choose the optimal value of the load (resistance) for maximum power transfer.įigure 1: A schematic of the ADALM1000. The new simpler circuit enables rapid calculations of the voltage, current, and power than the more complicated original circuit is able to deliver to a load. One of the principal uses of Thévenin’s theorem is to replace a large portion of a circuit, often a more complicated and uninteresting part, with a simple equivalent. After creating the Thévenin equivalent circuit, the load voltage VL or the load current IL may be easily determined. Thévenin’s theorem is a process by which a complex circuit is reduced to an equivalent circuit consisting of a single voltage source (VTH) in series with a single resistance (RTH) and a load resistance (RL). The above discussion has proved that the load impedance Z L should be the conjugate of the source internal Impedance Z i to have maximum power delivered to the load.The objective of this article is to verify Thévenin’s theorem by obtaining the Thévenin equivalent voltage (VTH) and Thévenin equivalent resistance (RTH) for the given circuit, and then to verify the maximum power transfer theorem. Power dissipated in the load resistor R, is P$_$ should be: Where Rth and Vth are fixed and we want to change the load resistor R such that the load gets maximum power dissipation. Suppose the following complex circuit is reduced to Thevenin’s resistor and Thevenin’s voltage source. Maximum Power Transfer Theorem Explanation with Example
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