Which H-Bridge driver can I use for power supply amplification?

AI Thread Summary
The discussion centers on designing a DC to AC inverter using a PIC24H microcontroller to generate PWM waveforms for controlling an H-bridge driver. The user initially tried the LMD18200 but found it unsuitable for AC applications. Suggestions include using an isolated transformer or a switch-mode generated negative rail to achieve the desired output. The conversation highlights the need for a level shifter or clamper circuit to create both positive and negative voltage outputs from the H-bridge. Ultimately, the goal is to simulate a solar panel tied to the grid and observe the resulting AC waveform on an oscilloscope.
alexarthur
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I have been tying to design and build a dc to ac inverter. I want to convert 10v dc to 25v ac @ 50hz. I want to use a pic24h microcontroller to generate pwm waveforms to control a H bride driver. I have programmed the pic24h to produce pwm waveforms. I used the LMD18200 as the h bridge driver only to find out it is only to be used for dc motor applications. I want a pwm waveform that goes postive and negative at the output of the h-bridge so that i can filter it(to get a 50 hz sine wave). Can anyone please suggest a H- bridge driver for me or refer me to its datasheet?

Thank you in advance.

Alex Arthur
 
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i don't know, but i think your idea is missing a step. i doubt your going to get a driver which will drive below the power rails. you could use an isolated transformer on the output, or a switch-mode generated negative rail, then any H-bridge arrangement should work.

is it for powering something? what is the goal here? how about using an audio class-D power amp IC.
 
The driver is not going to get its power supply from the micro controller, its only getting its input logic from the micro controller. Its not powering anything, I just want to see the 25v ac on an oscilloscope. So I''ll just put a resistor as the load. It is supposed to simulate a solar panel being tied to the grid. However I can't work at high voltages
 
Sorry! the H-bridge will drive a transformer which will be tied to the grid.
 
Hi ...
I have not seen any H-bridge producing a pwm output switching between positive and negative voltages ... But u can feed that pwm signal to a LEVEL SHIFTER or CLAMPER circuit to shift its DC LEVEL appropriately to get both positive as well negative-going pulses , right ?
Then , u can filter that waveform to get sine wave , right ?
 
That H bridge has two outputs that are tied alternately to Vsupply and common

So, will voltage between output 1 and output 2 not alternate between + Vsupply and -Vsupply ?
Would a voltmeter connected there not report that?
A transformer winding connected there would see AC voltage.

Remember voltage is potential difference
 

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