电路分析英文 Lecture 10-课件（PPT-精）.ppt

16.3 – Ladder Networks Here we will calculate the total resistance and resulting source current, and then work back through the ladder until the desired current, I6 , (or voltage) is obtained. * Ladder Networks Impedance ZT , ZT and ZT and the currents I1 and I3 are defined: * * Series-Parallel Circuits Boylestad, p 719 Fig 16.14 Compute I Find I1, I2 and I3 Verify Kirchhoff’s current law by showing that I=I1+ I2 +I3 * Solution to 16.14 * Solution continued * A word about nodal and mesh analysis Same as DC, but need to do it will all the phases in AC, otherwise the same Lets do a Nodal analysis example * * Solution continued * Solution continued * 16.5 – Applications GFCI (Ground Fault Circuit Interrupter) GFCI outlets are to be used in areas where water and dampness could result in serious injury, such as bathrooms, kitchens, pools, outdoor receptacles. A protection circuit separates the power source from the outlet. The protection circuit must be connected to the central ground. * Applications The network senses both current entering ( Ii ) and current leaving ( Io), and provides a direct connection to the outlet when they are equal. If a fault develops, the protection circuit will sense the difference, between feed and return currents, and cut off power to the outlet. * Applications The test button will place a large-value resistor between the line and ground to “unbalance” the line and cause a fault condition. When the test button is released, it will remove the resistor from the line, removing the fault condition. The reset button is used to reconnect the outlet to the supply after a fault (from an external device or the “test button”) has been removed . * * * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * * 12 * 13 * 14 ECTE170 – Lecture 10/11 * Chapter 16 – Boylestad Series- Parallel AC Networks Analysis Series- Parallel AC Networks * 16.1 – Introduction In general, when working with series-parallel AC networks, consider the following approach