Combining Dual Half Bridge Outputs

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Combining Dual Half Bridge Outputs

Postby HKS_TRD on Thu Sep 05, 2019 10:13 pm

I need to PWM a fuel pump with a maximum current draw of 19A. Is it possible to connect both of the outputs of the Dual Half Bridge together to meet the current requirement
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Re: Combining Dual Half Bridge Outputs

Postby SDean on Fri Sep 06, 2019 7:59 am

Hi,

I am presuming that you mean the DHB external controller? (P/N 41213)?

If so, then you can do this with these units, I would however recommend that the DHB is used to low side switch the pump, rather than high side.
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Re: Combining Dual Half Bridge Outputs

Postby HKS_TRD on Fri Sep 06, 2019 10:28 am

Hi Stephen
That is the controller I am referring to.
I have two pumps and will be running each off a 20A output on my PDM30. If I use the DHB to low side switch the pump will I be able to use the 1 DHB to independently control each pump?
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Re: Combining Dual Half Bridge Outputs

Postby SDean on Fri Sep 06, 2019 11:17 am

Hi,

For that current draw, you would need to have a separate DHB for each pump.
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Re: Combining Dual Half Bridge Outputs

Postby HKS_TRD on Fri Sep 06, 2019 12:25 pm

Thanks Stephen.
I do have an extra DHB which I hadn't allocated a use to yet, though I do need to PWM 2 MAC valves as well and the factory PPS solenoid in the steering rack
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Re: Combining Dual Half Bridge Outputs

Postby SDean on Fri Sep 06, 2019 2:14 pm

The ECU can drive the MAC Valves, they are low current draws.

The PPS Solenoid will most likely have a quite high current draw (60A+) and usually has a dedicated control circuit built in.
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