An interleaved boost converter (100, 200), comprising: a first converter operating as a master converter to receive an input power and generate a first converted output power. a second converter operating as a slave converter to receive the input power and generate a second converted output power, wherein the first converted output power and the second converted output power are interleaved; a cycle controller (140, 240) to generate a first drive signal (142, 242) to control switching of the first converter and a second drive signal (144, 244) to control switching of the second converter, to receive a first cycle signal (114, 214) from the first converter and a second cycle signal (118, 218) from the second converter, wherein the first cycle signal (114, 214) and the second cycle signal (118, 218) have a power phase time corresponding to a power phase of the respective converter and a ringing phase time corresponding to a ringing phase of the respective converter, the cycle controller (140, 240) to determine a master ringing phase time of the first cycle signal (114, 214) and to apply the master ringing phase time to the second cycle signal (118, 218) to determine a slave ringing phase time, the cycle controller (140, 240) generating the second drive signal in accordance with the slave ringing phase time; characterized in that the master ringing phase time comprises a master time duration corresponding to a number of valleys of the ringing phase of the first cycle signal (114, 214), wherein the cycle controller (140, 240) applies the master time duration to the ringing phase of the second cycle signal (118, 218) and determines the slave ringing phase time as ending at a valley of the ringing phase of the second cycle signal (118, 218) that is closest to an end of the master time duration. a first converter operating as a master converter to receive an input power and generate a first converted output power. a second converter operating as a slave converter to receive the input power and generate a second converted output power, wherein the first converted output power and the second converted output power are interleaved; a cycle controller (140, 240) to generate a first drive signal (142, 242) to control switching of the first converter and a second drive signal (144, 244) to control switching of the second converter, to receive a first cycle signal (114, 214) from the first converter and a second cycle signal (118, 218) from the second converter, wherein the first cycle signal (114, 214) and the second cycle signal (118, 218) have a power phase time corresponding to a power phase of the respective converter and a ringing phase time corresponding to a ringing phase of the respective converter, the cycle controller (140, 240) to determine a master ringing phase time of the first cycle signal (114, 214) and to apply the master ringing phase time to the second cycle signal (118, 218) to determine a slave ringing phase time, the cycle controller (140, 240) generating the second drive signal in accordance with the slave ringing phase time; characterized in that the master ringing phase time comprises a master time duration corresponding to a number of valleys of the ringing phase of the first cycle signal (114, 214), wherein the cycle controller (140, 240) applies the master time duration to the ringing phase of the second cycle signal (118, 218) and determines the slave ringing phase time as ending at a valley of the ringing phase of the second cycle signal (118, 218) that is closest to an end of the master time duration.