| 摘要 |
According to one embodiment, a power circuit includes an input terminal 1 to which a DC input voltage is applied, an output terminal 2, a first DC/DC converter which receives the DC input voltage and supplies a first phase output current to the output terminal 2, a second DC/DC converter which supplies an output current lower than the first phase output current to the output terminal in a second phase which is different from the first phase, and a controller which controls operations of the first and second DC/DC converters. |
| 主权项 |
1. A power circuit, comprising:
an input terminal which receives a DC input voltage; an output terminal which outputs an output voltage; an error calculating circuit which outputs an error signal based on a comparison of the output voltage with a reference voltage; a compensating circuit which outputs a control signal based on the error signal; a first DC/DC converter which receives the DC input voltage and supplies a first output current of a first phase to the output terminal, wherein the first output current is controlled with a first control signal which is obtained by a calculation using the control signal of the compensating circuit; a second DC/DC converter which receives the DC input voltage and supplies a second output current lower than the first output current to the output terminal in a second phase which is different from the first phase, wherein the second output current is controlled with a second control signal which is obtained by the calculation using the control signal of the compensating circuit; a first current sensor which senses the first output current and outputs a first output current information corresponding to the first output current; and a second current sensor which senses the second output current and outputs a second output current information corresponding to the second output current, wherein a load current value is obtained by summing the first output current information and the second output current information, a control circuit which compares a predetermined mode threshold value associated with a driving mode of the first and second DC/DC converters with the load current value obtained by summing the first and second output current information and stops one of the first and second DC/DC converters in accordance with a comparison result, and wherein when the driving mode is switched into a mode which stops one of the first and second DC/DC converters, the control circuit performs to forcibly rewrite a value of the control signal of the compensating circuit to change values of the first and the second control signals such that a value of the output current of the first or second DC/DC converter after the driving mode is switched is equal to a value obtained by summing the output currents of the first and second DC/DC converters before the driving mode is switched, and wherein a ratio between average values of the first output current and the second output current is set to a predetermined value. |
