理想开关介绍

sw1_l4 sw1_l4 (Digitally-Controlled Ideal Switch)

Associated Symbols:sw1_l4

License Requirements:OPT_TEMPLATE_LIB

Part Category:Electrical Templates -- Switches (Ideal) Related Topics:Switch Selection Guide

bjt_l4 — Idealized BJT with logic input

Functional Description

The sw1_l4 template models an ideal switch that is controlled by a logic_4 input. The model provides quasi-realistic switching behavior for power semiconductor devices. You can specify values for on and off resistance, along with turn-on and turn-off times. For information about logic_4, refer to the Usage Notes. Template Description Sections

Connection Points

Symbol Properties

Post-Processing Information

Usage Notes

Netlist Examples

sw1_l4 Connection Points

Name

Type

Description

p electrical plus connection m electrical minus connection c

state logic_4

switch position control

Digitally-controlled ideal switch

c

m

p (sw1_l4)

sw1_l4

sw1_l4 Symbol Properties

Property

primitive Description:This symbol calls the template

sw1_l4, which models an ideal switch.

ref Description:Suffix appended to a template name

that uniquely identifies a part in a

schematic.

Default:If not specified, will be assigned by

the schematic capture tool

Example

Input:

Can be any alpha-numeric string

ron Description:Resistance of switch when it is on

(ron > 0) (see Usage Notes).

Default (units):1m (Ω)

Example

Input:

1

roff Description:Resistance of switch when it is off

(roff > 0) (see Usage Notes).

Default (units):1meg (Ω)

Example

Input:

10meg

sw1_l4 Post Processing Information

ton

Description:Turn-on time (ton >= 0) (see Usage

Notes)Default (units):1u (s) Example Input:

10n

toff

Description:Turn-off time (toff >= 0) (see Usage

Notes)Default (units):1u (s) Example Input:

10n

Name

Type

Units

Description

i var i A switch current v val v V switch voltage r val r Ωswitch resistance g

val g

S

switch conductance

Property

sw1_l4

sw1_l4 Usage Notes

The electrical resistance between connections p and m is determined by the logic_4 state at connection c, as shown here: l4_0switch is open (off) and the conducting path between p and m has a resistance of roff.

l4_1switch is closed (on) and the conducting path

between p and m has a resistance of ron.

l4_x switch behaves according to the previous l4_0 or

l4_1 that appeared at c.

l4_z switch behaves according to the previous l4_0 or

l4_1 that appeared at c.

The mathematical functions that describe the resistance transitions from ron to roff and from roff to ron provide a switching behavior that matches that of a semiconductor device. This model also has better convergence than sw_l4 in power applications such as single switch and half-bridge configurations with resistive and inductive loads. The parameters ton and toff control the switching speed at turn-on and turn-off. They correspond to the sum of delay and transition times. For high power semiconductors (V>120V, I>400A), typical switching times range between 1u and 10u seconds. The model imposes that ron, roff, ton, and toff will be greater than zero. Roff may be less than ron.