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DPDT Switch

Model double-pole double-throw switch

Library

Passive Devices/Switches

Description

The DPDT Switch block models a double-pole double-throw switch:

  • When the switch is closed, ports c1 and c2 are connected to ports s12 and s22, respectively.

  • When the switch is open, ports c1 and c2 are connected to ports s11 and s21, respectively.

Closed connections are modeled by a resistor with value equal to the Closed resistance parameter value. Open connections are modeled by a resistor with value equal to the reciprocal of the Open conductance parameter value.

The switch is closed if the voltage presented at the vT control port exceeds the value of the Threshold parameter.

Optionally, you can add a delay between the point at which the voltage at vT passes the threshold and the switch opening or closing. To enable the delay, on the Dynamics tab, set the Model dynamics parameter to Model turn-on and turn-off times.

Dialog Box and Parameters

Main Tab

Closed resistance

Resistance between the c and s electrical ports when the switch is closed. The value must be greater than zero. The default value is 0.01 Ω.

Open conductance

Conductance between the c and s electrical ports when the switch is open. The value must be greater than zero. The default value is 1e-6 S.

Threshold

The threshold voltage for the control physical signal input vT above which the switch will turn on. The default value is 0 V.

Dynamics Tab

Model dynamics

Select whether the block models a switching delay:

  • No dynamics — Do not model the delay. This is the default option.

  • Model turn-on and turn-off times — Use additional parameters to model a delay between the point at which the voltage at vT passes the threshold and the switch opening or closing.

Turn-on delay

Time between the input voltage exceeding the threshold voltage and the switch closing. This parameter is only visible when you select Model turn-on and turn-off times for the Model dynamics parameter. The value must be greater than zero. The default value is 1e-3 seconds.

Turn-off delay

Time between the input voltage falling below the threshold voltage and the switch opening. This parameter is only visible when you select Model turn-on and turn-off times for the Model dynamics parameter. The value must be greater than zero. The default value is 1e-3 seconds.

Initial input value, vT

The value of the physical signal input vT at time zero. This value is used to initialize the delayed control voltage parameter internally. This parameter is only visible when you select Model turn-on and turn-off times for the Model dynamics parameter. The default value is 0 V.

Ports

This block has the following ports:

vT

Physical signal that opens and closes the switch

c1, c2, s11, s12, s21, s22

Electrical conserving ports

See Also

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