Patent ID: 8922177

Claim:
A multiphase converter having an input configured to receive an input voltage and having an output configured to provide an output voltage, the multiphase converter comprising: a plurality of phase circuits, wherein each phase circuit having an input coupled to the input of the multiphase converter and an output coupled to the output of the multiphase converter, wherein each phase circuit comprising a switch having a control terminal, and wherein the control terminal of the switch is configured to receive a drive signal; and a control circuit, configured to provide a plurality of drive signals, the control circuit comprising: a phase control circuit, corresponding to one of the phase circuits, wherein the phase control circuit having a first input terminal and an output terminal, wherein the first input terminal is configured to receive a drive signal of the corresponding phase circuit, and the output terminal is configured to provide a phase control signal, wherein the phase control signal is configured, based on the drive signal of the corresponding phase circuit, to adjust an ON-time period for the corresponding phase circuit or to adjust a reference signal for the corresponding phase circuit; wherein one of the phase circuits is configured as a master phase circuit, and wherein the phase control circuit further comprises: a second input terminal, configured to receive a drive signal of the master phase circuit; an indicating circuit, having a first input, a second input and an output, wherein the first input is configured to receive the drive signal of the master phase circuit, wherein the second input is configured to receive the drive signal of the corresponding phase circuit, and wherein the output is configured to provide an indicating signal, and further wherein the indicating signal turns to a first state when the drive signal of the master phase circuit becomes activated, and turns to a second state when the drive signal of the corresponding phase circuit becomes activated; an averaging circuit, having an input and an output, wherein the input is coupled to the output of the indicating circuit, and wherein the output is configured to provide an average voltage of the indicating signal within a time period; and a comparing circuit, having an inverting terminal, a non-inverting terminal and an output, wherein the inverting terminal is coupled to the output of the averaging circuit to receive the average voltage, and wherein the non-inverting terminal is configured to receive an interleaving reference signal, and based on the average voltage and the interleaving reference signal the output is configured to provide the phase control signal.