Can any one help me to find the, advantages and disadvantages of bidirectional Switch(series connection of two unidirectional switch) over Unidirectional switch
Bi-directional switches are used when the circuit can develop a voltage polarity in both directions and the switch must be able to block current flow in either direction until switched on for the specific (any one at a time) direction.
Unidirectional switches are used when the circuit can develop a voltage polarity in one direction only and the switch must be able to block current flow in that direction until switched on.
Some circuits can develop a voltage polarity in both the directions and the switch must be able to block current in both directions. However, when switched on, the switch must be able to conduct current in one specific direction only and shall never conduct in the reverse direction. Sometimes, a series connected diode is needed with the semiconductor switch to be able to meet this requirement.
Please clarify your need with diagram of the switches you have implied and circuit application, for specific comments.
Thanks for your valuable answer and i will provide the circuitconfiguration...
I just add one comment: bilateral switches, which block but also conduct current with both polarities are very common in MOSFET digital (e.g. to make very space-efficient XOR gates or MUXes in VLSI chips) or switched capacitor (SC) circuits (those mentioned bilateral switches are the "switches" in SC technology), for instance. This switch is called the "CMOS bilateral switch" or the "CMOS transmission gate".
A popular digital CMOS IC with four of them inside is the 4066; see for instance http://www.ti.com/lit/ds/symlink/cd74hct4066-q1.pdf.
http://www.ti.com/lit/ds/symlink/cd74hct4066-q1.pdf
i think
To calculation of blocking voltage (or cost)
This is advantage of Bi-directional switches with anti-parallel diode are used,compare to two IGBT with two diode.
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