A Bleeder Module removes excess energy from the bus and dissipates it as heat. When an inverter is in regenerative mode, the bus voltage rises. If the bus voltage rises to its threshold voltage, the chopper engages to bleed excess energy to ensure the bus voltage does not exceed the threshold voltage.

A Bleeder Module consists of a chopper and resistor as shown in the graphic below.

Power flow to the resistor is reduced proportionally by the chopper efficiency.  Clicking on the bleeder on the main form displays the bleeder ratings, application requirements and operating margins as shown below.

 

Bleeder Calculations

 

Symbol	Description	Units
Pcont	Bleeder continuous/average power	W
Ppeak	Bleeder peak power	W
W	Bleeder energy dissipation	Ws
Pb(t)	Bleeder power over time	W
T	Cycle time	s
t	Time	s

 

Related topics

  Sample Power Flow Configuration