Help needed with complimentary pair.

Top_Gun007 · 24th May 2011, 05:52 PM

Can anybody help with this design. I have a P-channel Mosfet connected with N-channel in a complimentary configuration. It is across a split supply, where P-channel source is connected +30V and the N-channel source is connected to -30V. The drains are connected together and are linked to one end of an inductor.

I want to connect a load from the inductor/capacitor output to ground. I need an output of 15V and upto 15A out. At the moment I am getting my output voltage of 15V, but when i load the output, my +30V starts to increase and my output starts to drop.

Hope you can help....Thank You.

Elvee · 25th May 2011, 07:50 AM

Looks like your lower transistor is acting as a boost converter, with the the body diode of the upper transistor functionning as a rectifier.
What's the purpose of your circuit?

Top_Gun007 · 25th May 2011, 09:10 AM

The circuit is going to be used to give 15V output which will be switched every ten minutes to give +15V then -15V and so on...with variable currents upto 15A.

Thanks

Elvee · 25th May 2011, 11:34 AM

I think the control strategy of your transistors is wrong.

The common point to the inductor should never be left high-impedance.
You must operate your half-bridge like a class D amplifier.

24th May 2011, 05:52 PM	#1
Top_Gun007 diyAudio Member Join Date: Nov 2006	Help needed with complimentary pair. Can anybody help with this design. I have a P-channel Mosfet connected with N-channel in a complimentary configuration. It is across a split supply, where P-channel source is connected +30V and the N-channel source is connected to -30V. The drains are connected together and are linked to one end of an inductor. I want to connect a load from the inductor/capacitor output to ground. I need an output of 15V and upto 15A out. At the moment I am getting my output voltage of 15V, but when i load the output, my +30V starts to increase and my output starts to drop. Hope you can help....Thank You.

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25th May 2011, 07:50 AM	#2
Elvee diyAudio Member Join Date: Sep 2006	Looks like your lower transistor is acting as a boost converter, with the the body diode of the upper transistor functionning as a rectifier. What's the purpose of your circuit?

25th May 2011, 09:10 AM	#3
Top_Gun007 diyAudio Member Join Date: Nov 2006	The circuit is going to be used to give 15V output which will be switched every ten minutes to give +15V then -15V and so on...with variable currents upto 15A. Thanks

25th May 2011, 11:34 AM	#4
Elvee diyAudio Member Join Date: Sep 2006	I think the control strategy of your transistors is wrong. The common point to the inductor should never be left high-impedance. You must operate your half-bridge like a class D amplifier.

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