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WOLFRAM SYSTEM MODELER

SignalPWM

Generates a pulse width modulated (PWM) boolean fire signal

Diagram

Wolfram Language

In[1]:=

SystemModel["Modelica.Electrical.PowerConverters.DCDC.Control.SignalPWM"]

Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This controller can be used both for DC/DC and AC/DC converters. The signal input of the PWM controller is the duty cycle; the duty cycle is the ratio of the on time to the switching period. The output firing signal is strictly determined by the actual duty cycle, indicated as d in Fig. 1.

**Fig. 1:** Firing (`fire`) and inverse firing (`notFire`) signal of PWM control; `d` = duty cycle; `f` = switching frequency

The firing signal is generated by comparing the sampled duty cycle input with a periodic saw tooth signal [Williams2006].

Parameters (4)

useConstantDutyCycle	Value: true Type: Boolean Description: Enables constant duty cycle
constantDutyCycle	Value: 0 Type: Real Description: Constant duty cycle
f	Value: 1000 Type: Frequency (Hz) Description: Switching frequency
startTime	Value: 0 Type: Time (s) Description: Start time

Connectors (3)

	dutyCycle	Type: RealInput Description: Duty cycle
	fire	Type: BooleanOutput Description: Firing PWM signal
	notFire	Type: BooleanOutput Description: Firing PWM signal

dutyCycle

Type: RealInput

Description: Duty cycle

fire

Type: BooleanOutput

Description: Firing PWM signal

notFire

Type: BooleanOutput

Description: Firing PWM signal

Components (6)

	const	Type: Constant Description: Generate constant signal of type Real
	limiter	Type: Limiter Description: Limit the range of a signal
	greaterEqual	Type: Less Description: Output y is true, if input u1 is less than input u2
	zeroOrderHold	Type: ZeroOrderHold Description: Zero order hold of a sampled-data system
	sawtooth	Type: SawTooth Description: Generate saw tooth signal
	inverse	Type: Not Description: Logical 'not': y = not u

Used in Examples (2)

PolyphaseTwoLevel_R

Modelica.Electrical.PowerConverters.Examples.DCAC.PolyphaseTwoLevel

Polyphase DC to AC converter with R load

PolyphaseTwoLevel_RL

Modelica.Electrical.PowerConverters.Examples.DCAC.PolyphaseTwoLevel

Polyphase DC to AC converter with R-L load

Used in Components (5)

	SwitchingDcDc Modelica.Electrical.Machines.Examples.ControlledDCDrives.Utilities Switching DC-DC inverter
	SinglePhaseTwoLevel Modelica.Electrical.PowerConverters.Examples.DCAC.ExampleTemplates Single-phase two level inverter including control
	ChopperStepDown Modelica.Electrical.PowerConverters.Examples.DCDC.ExampleTemplates Step down chopper including control
	ChopperStepUp Modelica.Electrical.PowerConverters.Examples.DCDC.ExampleTemplates Step up chopper including control
	HBridge Modelica.Electrical.PowerConverters.Examples.DCDC.ExampleTemplates H bridge DC/DC converter