Understanding PWM (Pulse Width Modulation)

Understanding PWM (Pulse Width Modulation)

Pulse Width Modulation (PWM) is a widely used technique in electronics and digital systems to control the power supplied to electrical devices such as motors, LEDs, heaters, and more.

It operates by varying the width of pulses in a digital signal to adjust the average power delivered to the load.

Within zappi 1% increment of PWM, the EVSE (Zappi) is telling the EV that it can charge by an increment of 0.6 Amps per phase.


Where to find PWM

Access the Menu: Press the Menu button on the zappi (3-line button).

Navigate to Readings: Once in the menu, use the arrow buttons or touch screen to navigate to the "Readings" menu. 

Readings - Page 1: Towards the bottom of the screen you will see Pilot (PWM). 


PWM Range

zappi will operate a PWM range of 10%-53% (6A to 32 Amps per phase). 


PWM To kW / AMP Chart

 

PWM %Current/APower/W @230V PWM %Current/APower/W @230V
1061380 3219.24416
116.61518 3319.81554
127.21656 3420.41692
137.81794 35214830
148.41932 3621.64968
1592070 3722.25106
169.62208 3822.85244
1710.22346 3923.45382
1810.82484 40245520
1911.42622 4124.65658
20122760 4225.25796
2112.62898 4325.85934
2213.23036 4426.46072
2313.83174 45276210
2414.43312 4627.66348
25153450 4728.26486
2615.63588 4828.86624
2716.23726 4929.46762
2816.83864 50306900
2917.44002 5130.67038
30184140 5231.27176
3118.64278    

 


 

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