发明名称 |
DC/DC converter, switching power supply device, and electronic apparatus,configured to include a phase detector and a phase holder |
摘要 |
Provided is a DC/DC converter for a multi-phase switching power supply device which include a plurality of DC/DC converters including a master DC/DC converter and a plurality of slave DC/DC converters that are connected in parallel to each other and operate in different phases. The DC/DC converter includes: first and second terminals to cascade the plurality of DC/DC converters in a line; a phase detector that detects the number of operating converters in the switching power supply device and the phases of the plurality of DC/DC converters, on the basis of a current input to the first terminal and a current output from the second terminal; a phase holder that holds the detected phases and outputs a phase holding signal; and a clock generator that selects a clock corresponding to the phase of a host converter from multi-phase clocks, on the basis of the phase holding signal, and outputs the selected clock. The DC/DC converter performs a switching operation on the basis of the selected clock. |
申请公布号 |
US9520765(B2) |
申请公布日期 |
2016.12.13 |
申请号 |
US201414574579 |
申请日期 |
2014.12.18 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
Nishi Ryohsuke;Yorozu Yasuaki |
分类号 |
G05F5/04;H02M1/084;H02M3/156;H02M3/158;H02M1/00 |
主分类号 |
G05F5/04 |
代理机构 |
Cooper & Dunham LLP |
代理人 |
Cooper & Dunham LLP |
主权项 |
1. A DC/DC converter for a multi-phase switching power supply device which includes a plurality of DC/DC converters including a master DC/DC converter and a plurality of slave DC/DC converters that are connected in parallel to each other and operate in different phases, the DC/DC converter comprising:
first and second terminals that cascade the plurality of DC/DC converters in a line; a phase detector that detects the number of operating converters amongst the converters connected in parallel and the phases of the DC/DC converters, on the basis of a current which flows to the first terminal and a current which flows from the second terminal; a phase holder that holds the detected phases and outputs a phase holding signal indicating the detected phases; and a clock generator that selects a clock corresponding to the phase of a host converter from multi-phase clocks which are generated from a reference clock, on the basis of the phase holding signal, and outputs the selected clock to the DC/DC converter, wherein the DC/DC converter performs a switching operation on the basis of the selected clock output from the clock generator. |
地址 |
Tokyo JP |