This is my first time posting here. This problem has been killing me for a week now. I have looked at several posts relating to the IR2110 driver in a full-bridge setup but still can't figure out the problem. Any help is greatly appreciated.
I'm building a small-scale version of a full bridge, buck-boost that will be later implemented for high voltages. I am using two IR2110 to drive the gates of the MOSFETs. Before implementing the full bridge, I tested each driver in a half bridge configuration successfully (with correct Vgs signals). The problem comes when I link the bridges together with the inductor. The converter is load dependent, but in the full bridge setup no current is being drawn from the power supply. I know these drivers are usually used in a H-bridge setup where Vsupply goes to the drain of both high side MOSFETs and this might have something to do with it. I'm thinking I need to add additional capacitors or resistors to the 'left side' of the bridge.
Specs: fs = 100kHz, DC = 60% (for top-left/bottom-right MOSFET), Coss (MOSFET) = 1.28nF
Attached:
1. Simplified design (H.V. listed)
2. Half-bridge implementation with the IR2110 (when the other side is linked the inductor is connected between both Vs pins and b/w the sources and drains of the MOSFETs on both sides)*
*Mistake on the circuit diagram: Vcc = 13.5V; Vcc should be connected to anode of Schottky diode
I'm building a small-scale version of a full bridge, buck-boost that will be later implemented for high voltages. I am using two IR2110 to drive the gates of the MOSFETs. Before implementing the full bridge, I tested each driver in a half bridge configuration successfully (with correct Vgs signals). The problem comes when I link the bridges together with the inductor. The converter is load dependent, but in the full bridge setup no current is being drawn from the power supply. I know these drivers are usually used in a H-bridge setup where Vsupply goes to the drain of both high side MOSFETs and this might have something to do with it. I'm thinking I need to add additional capacitors or resistors to the 'left side' of the bridge.
Specs: fs = 100kHz, DC = 60% (for top-left/bottom-right MOSFET), Coss (MOSFET) = 1.28nF
Attached:
1. Simplified design (H.V. listed)
2. Half-bridge implementation with the IR2110 (when the other side is linked the inductor is connected between both Vs pins and b/w the sources and drains of the MOSFETs on both sides)*
*Mistake on the circuit diagram: Vcc = 13.5V; Vcc should be connected to anode of Schottky diode
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