PWM - Revision history

Tero K at 14:20, 14 October 2017

2017-10-14T14:20:31Z

Tero K at 21:22, 24 June 2013

2013-06-24T21:22:33Z

Tero K at 16:13, 24 March 2013

2013-03-24T16:13:05Z

WikiAdmin at 20:04, 18 April 2012

2012-04-18T20:04:01Z

Tero K at 17:34, 18 April 2012

2012-04-18T17:34:42Z

Tero K at 17:31, 18 April 2012

2012-04-18T17:31:46Z

WikiAdmin at 11:16, 18 April 2012

2012-04-18T11:16:34Z

WikiAdmin at 11:49, 13 April 2012

2012-04-13T11:49:52Z

Tero K: /* Cons */

2012-04-12T22:57:41Z

‎Cons

WikiAdmin at 15:42, 11 April 2012

2012-04-11T15:42:39Z

@@ Line 1: / Line 1: @@
-[[File:pwm_wiki.png|thumb|PWM signal as setpoint|400px]]
+[[File:pwm_wiki.png|thumb|PWM signal as setpoint|400px]][[File:pwm_vs_analog.jpg|thumb|Another illustration of PWM nature. On the left side there is a simple circuit for converting analog voltage into PWM signal. Image credit analog.com.|400px]]
 PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[setpoint signal]].
@@ Line 37: / Line 37: @@
 ==Links==
 [http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article]
-[[Category:Signals]]
 [[Category:Glossary]]

@@ Line 1: / Line 1: @@
-[[File:pwm_wiki.png|thumb|PWM signal as reference|400px]]
+[[File:pwm_wiki.png|thumb|PWM signal as setpoint|400px]]
-PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[Reference signal|referece signal]].
+PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[setpoint signal]].
 The main idea in PWM is to switch voltage either fully ''on'' or ''off'' so rapidly that receiving device "feels" only the average voltage caused by pulsed voltage.
@@ Line 27: / Line 27: @@
 * Increased [[Electromagnetic interference|EMI noise]] compared to linear voltage
 * [[Dead-time distortion]]
-===As reference signal===
+===As setpoint signal===
-In some drive models, PWM signal can be used also as [[reference signal]] to replace analog signal (the +/- 10V control). In this case PWM voltage is typically 3-5V and the duty cycle of signal determines the amplitude.
+In some drive models, PWM signal can be used also as [[setpoint signal]] to replace analog signal (the +/- 10V control). In this case PWM voltage is typically 3-5V and the duty cycle of signal determines the amplitude.
-Compared to analog input in VSD products 0% PWM duty cycle equals -10V, 50% equals 0V and 100% equals +10V. Benefits of using PWM instead of analog reference:
+Compared to analog input in VSD products 0% PWM duty cycle equals -10V, 50% equals 0V and 100% equals +10V. Benefits of using PWM instead of analog setpoint:
 * [[Electromagnetic interference|EMI noise]] tolerant
 * Easy to galvanically isolate

← Older revision		Revision as of 16:13, 24 March 2013
Line 38:		Line 38:
	[http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article]		[http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article]
	[[Category:Signals]]		[[Category:Signals]]
		+	[[Category:Glossary]]

@@ Line 13: / Line 13: @@
 In motor & power control it is typical to use at least 15 kHz PWM frequency to avoid audible high pitched noise that coils produce when driven by PWM.
-==Pros and cons in power applications==
+==Usage in GD products==
-===Pros===
+===As motor output===
 * Very high efficiency due to low losses in electronics
 * Usually very little heat sinking needed
 * Easy to produce in digital circuits
 * Robust
-===Cons===
+;Cons
 * Increased [[Electromagnetic interference|EMI noise]] compared to linear voltage
 * [[Dead-time distortion]]
 ===As reference signal===
 In some drive models, PWM signal can be used also as [[reference signal]] to replace analog signal (the +/- 10V control). In this case PWM voltage is typically 3-5V and the duty cycle of signal determines the amplitude.

← Older revision		Revision as of 17:34, 18 April 2012
Line 1:		Line 1:
−	[[File:pwm_wiki.png\|thumb\|PWM signal as reference]]	+	[[File:pwm_wiki.png\|thumb\|PWM signal as reference\|400px]]
	PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[Reference signal\|referece signal]].		PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[Reference signal\|referece signal]].

← Older revision		Revision as of 17:31, 18 April 2012
Line 1:		Line 1:
		+	[[File:pwm_wiki.png\|thumb\|PWM signal as reference]]
	PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[Reference signal\|referece signal]].		PWM a.k.a. pulse-width modulation is a voltage waveform usually seen in power electronics such as motor drives and power supplies. It has been also used as [[Reference signal\|referece signal]].

← Older revision		Revision as of 15:42, 11 April 2012
Line 37:		Line 37:
	==Links==		==Links==
	[http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article]		[http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article]
		+	[[Category:Signal]]