DCR current sensing for coupled inductor VR (2005)
To solve this issue, the DCR current sensing method for coupled inductor VR is proposed. After derivation, it is found that when the time constant of the current sensing network matches the time constant of the leakage inductance and DCR of the coupled inductor, the DCR current sensing network can sense the total inductor current instantaneously.
Therefore, we can use this DCR current sensing method to do the total current protection. Further analysis also shows that the AVP function and the current sharing function can be achieved with this DCR current sensing method.
The following figure shows the coupled inductor VR DCR current sensing method diagram.