Half-bridge with negative HV rail instead of ground?

[skywalker898]

Hi, I am not sure why I am unable to find this, but my searches can't seem to find an answer to this question. Does anyone know of a half-bridge chip that allows a negative high voltage rail instead of ground?

I am interested in creating a bi-polar pulser to switch between a positive high voltage rail and a negative high voltage rail. The half-bridge topology looks perfect except I have never seen a diagram, circuit, or part number or webpage that discusses how to do the half-bridge between a positive and negative voltage rail. Any guidance would be much appreciated.

I am hoping to buy a half bridge chip to make this pulser.

Thanks,
Brandon

 

[KlausST]

Hi,

GND is just a name.
Set GND to the negative rail and you are done.

Klaus

 

[FvM]

You'll probably need additional level shifting and a driver supply referred to DC-. In case of doubt use opto isolators.

To drive bipolar current into a load, your HV supply must be bipolar too, exposing a grounded center node.

 

[skywalker898]

Hi,

GND is just a name.
Set GND to the negative rail and you are done.

Klaus

Hi Klaus, do you think the Adum4223 could be used with a negative and positive high voltage rail?
https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM3223_4223.pdf

 

[KlausST]

Hi,

ADAUMxxxx is about the opposite of my idea.
I recommended to connect the GND, but it seems you want to isolate the GND.
Therefore I'm confused about what you really want to achieve.

Give more informations.

Klaus

 

[skywalker898]

Hi,

ADAUMxxxx is about the opposite of my idea.
I recommended to connect the GND, but it seems you want to isolate the GND.
Therefore I'm confused about what you really want to achieve.

Give more informations.

Klaus

I attached a picture of what I thought you meant. I am trying to create a square wave pulser between a positive and negative voltage rail, so would like to use an off the shelf half bridge gate driver to switch between the two voltage supplies (with a slight delay between to prevent a short). This diagram doesn't include any gate resistors, current limiting resistors, diodes, or flybacks but is basically the setup I'm wondering about. Is this what you meant and would something like this work for creating a bipolar pulser? Thanks.