Editing PWM
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Duty cycle describes the ratio of pulse on/off timing. Duty cycle is varied to produce different effective voltages. | Duty cycle describes the ratio of pulse on/off timing. Duty cycle is varied to produce different effective voltages. | ||
− | I.e. if duty cycle is 10%, then the PWM signal is "on" for 10% of time and "off" for 90% of time. I.e. if "on" equals voltage of 48VDC and "off" 0VDC, then 10% duty cycle equals effective voltage of 4.8VDC | + | I.e. if duty cycle is 10%, then the PWM signal is "on" for 10% of time and "off" for 90% of time. I.e. if "on" equals voltage of 48VDC and "off" 0VDC, then 10% duty cycle equals effective voltage of 4.8VDC. |
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==Frequency== | ==Frequency== | ||
Frequency describes how often on/off states appear in PWM signal. I.e. if PWM frequency is 20 kHz then there will be 20000 "on" and "off" periods per second. Frequency is typically kept constant over time. | Frequency describes how often on/off states appear in PWM signal. I.e. if PWM frequency is 20 kHz then there will be 20000 "on" and "off" periods per second. Frequency is typically kept constant over time. | ||
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==Links== | ==Links== | ||
[http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article] | [http://en.wikipedia.org/wiki/Pulse-width_modulation Wikipedia PWM article] | ||
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