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# SwitchV (Voltage Controlled Switch)

## SwitchV (Voltage Controlled Switch)

##### Parameters

Name

Description

Units

Default

Model

Model instance name

None

SWITCHVM1

R1

Resistance at voltage 1

Ohm

1.0

V1

Voltage 1

V

0.0

R2

Resistance at voltage 2

MOhm

1.0

V2

Voltage 2

V

1.0

R1, R2 > 0
V1 ≠ V2

##### Notes/Equations
1. This component implements a voltage controlled switch. The switch resistance between nodes 1 and 2 varies as a function of the applied control voltage (V CON is the voltage between nodes 3 and 4):

where

For these equations, it is assumed that V1 < V2. If V2 < V1, swap R1 and V1 with R2 and V2 in the equation above.
VCON is defined so that f(V1) = R1 and f(V2) = R2 and provides a smooth transition between states. This is a plot of the switch resistance as a function of the control voltage for V1=1, R1=10, V2=3, R2=10000.
2. The Model name is optional. If the model name is not specified, then R1, V1, R2 and V2 must all be specified on the SwitchV instance; if the model name is specified, then R1, V1, R2 and V2 on the SwitchV instance are optional and override the values specified in the SwitchV_Model.
3. R1 and R2 are model parameters, not the resistance at nodes. Convergence problems may occur if the difference between R1 and R2 is too large.
4. V1 and V2 are model parameters, not node voltages. Convergence problems may occur if the difference between V1 and V2 is too small.
5. This component works in all analyses, including transient and circuit envelope simulation. If a SwitchV_Model item is not present, the SwitchV Model parameter should be blank.
6. DC Operating Point Information lists the DC operating point parameters that can be sent to the dataset.

Name

Description

Units

Is

Current

A

Power

DC power dissipated

W

Vs

Voltage

V

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