SignalPWM

Generates a pulse width modulated (PWM) boolean fire signal

Diagram

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
	limiter	Type: Limiter
	greaterEqual	Type: Less
	zeroOrderHold	Type: ZeroOrderHold
	sawtooth	Type: SawTooth
	inverse	Type: Not

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)

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	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