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Bipolar Pwm Control On 3 Phase Bridge


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Hi everybody. I am having a little bit problem here. I am using Microchip dsPIC30F2010 to control BLDC motor.

I am now trying to do regenarative breaking. I know the theory how it works but in practical my controller has

some limitations. With the sample code it only works unipolar, so you only can speed up and go backwards.

My problem is on breaking. On the 3 phase bridge(H1, H2, H3, L1, L2, L3) unipolar let you flow thru H1 to L2 or

H2 to L1. What I am trying is to have it bipolar, so whenever H1 and L2 switches are off H2 and L1 on. That is

the idea. But the controller assigns H levels 1 at the same time, you can get complementary of H1 only to L1,

whenever you are assigned on for H1 you are assigned on for H2 as well. I am trying to get the complementary

of H1 to H2. If anybody has any idea how to imlement it, please le

t me know. Thanks a lot

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