Abstract
Coupled inductor is one appealing technology to improve transient response and reduce output decoupling significantly in interleaved multi-phase voltage regulators (VRs). One known problem is that there is no mature solution yet to sense the individual phase current accurately in a lossless way for couple inductor based VRs design. This will impact VR some normal function in one phase mode. This paper proposes a new solution to this problem and simulation is conducted to verify effectiveness of the proposal.
Highlights
According to the microprocessor’s roadmap, there are several stringent challenges for the future microprocessor voltage regulators (VRs): high output current, low output voltage, high current slew rate and low droop resistance
The sensed voltage Vc1 and Vc2 does not exactly conform to individual phase current i1 and i2 [5]. This deviates from the perception that Vc1 and Vc2 should be strictly proportional to i1 and i2. This method can ensure a normal function of VR which depends on total current of multiphase, knowing individual
This paper proposes one new method to sense individual phase current of couple inductor based VRs in a lossless way
Summary
According to the microprocessor’s roadmap, there are several stringent challenges for the future microprocessor voltage regulators (VRs): high output current, low output voltage, high current slew rate and low droop resistance. As shown, the sensed voltage Vc1 and Vc2 does not exactly conform to individual phase current i1 and i2 [5] This deviates from the perception that Vc1 and Vc2 should be strictly proportional to i1 and i2. This paper proposes one new method to sense individual phase current of couple inductor based VRs in a lossless way. Detailed working principle is analyzed and simulation is conducted to verify the theoretical analysis Even this method is initially proposed for couple inductor application, it’s proved that it’s a universal method which could be applied to both couple inductor and non-couple inductor multiphase buck voltage regulators. The function block could be implemented in either analog or digital way and could appear in other form/combination so long as it can achieve same mathematic result
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