Power supply circuit, control circuit thereof, and electronic apparatus
First Claim
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1. A power supply circuit comprising:
- a DC/DC converter comprising at least two switching elements and configured to receive an input voltage in an input line and generate an output voltage in an output line; and
a linear regulator configured to receive the output voltage of the output line of the DC/DC converter, stabilize the received output voltage to a target level, and supply the stabilized voltage to a corresponding load,wherein the DC/DC converter is configured to switch between a switching mode to switch the switching elements such that the output voltage approaches the target level and a bypass mode to put a switching element existing on a path from the input line to the output line, of the switching elements, in a full-on state and stop switching of the other switching element,wherein the switching mode includes a PWM (pulse width modulation) mode and a PFM (pulse frequency modulation) mode, andwherein, when switching from the bypass mode to the switching mode, a target value of the output voltage in the switching mode starts to smoothly decrease from a value that is larger than a normal value to the normal value, allowing the output voltage to decrease to the normal value while following the target value.
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Abstract
A power supply circuit including a DC/DC converter having switching elements and configured to receive an input voltage in an input line and generate an output voltage in an output line; and a linear regulator configured to receive the output voltage and supply a stabilized voltage to a load. The DC/DC converter switches between a switching mode to switch the switching elements and a bypass mode to put a switching element existing on a path from the input line to the output line, of the switching elements, in a full-on state and stop switching of the other switching element.
13 Citations
20 Claims
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1. A power supply circuit comprising:
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a DC/DC converter comprising at least two switching elements and configured to receive an input voltage in an input line and generate an output voltage in an output line; and a linear regulator configured to receive the output voltage of the output line of the DC/DC converter, stabilize the received output voltage to a target level, and supply the stabilized voltage to a corresponding load, wherein the DC/DC converter is configured to switch between a switching mode to switch the switching elements such that the output voltage approaches the target level and a bypass mode to put a switching element existing on a path from the input line to the output line, of the switching elements, in a full-on state and stop switching of the other switching element, wherein the switching mode includes a PWM (pulse width modulation) mode and a PFM (pulse frequency modulation) mode, and wherein, when switching from the bypass mode to the switching mode, a target value of the output voltage in the switching mode starts to smoothly decrease from a value that is larger than a normal value to the normal value, allowing the output voltage to decrease to the normal value while following the target value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 20)
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9. An electronic apparatus comprising:
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a battery; an application processor; a baseband processor; and a power supply circuit configured to supply power to the application processor and the baseband processor, wherein the power supply circuit comprises; a DC/DC converter comprising at least two switching elements and configured to receive an input voltage of the battery in an input line and generate an output voltage in an output line; a first linear regulator configured to receive the output voltage of the output line of the DC/DC converter, stabilize the received output voltage to a first target level, and supply the stabilized voltage to the application processor; and a second linear regulator configured to receive the output voltage of the output line of the DC/DC converter, stabilize the received output line voltage to a second target level, and supply the stabilized voltage to the baseband processor, wherein the DC/DC converter is configured to switch between a switching mode to switch the switching elements such that the output voltage approaches the first and second target levels and a bypass mode to put a switching element existing on a path from the input line to the output line, of the switching elements, in a full-on state and stop switching of the other switching element, wherein the switching mode includes a PWM mode and a PFM mode, and wherein, when switching from the bypass mode to the switching mode, a target value of the output voltage in the switching mode starts to smoothly decrease from a value that is larger than a normal value to the normal value, allowing the output voltage to decrease to the normal value while following the target value. - View Dependent Claims (10)
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11. A control circuit of a power supply circuit configured to supply power to one or more loads,
wherein the power supply circuit comprises: -
a DC/DC converter comprising at least two switching elements and configured to receive an input voltage in an input line and generate an output voltage in an output line; and a linear regulator configured to receive the output voltage of the output line of the DC/DC converter, stabilize the received output voltage to a target level, and supply the stabilized voltage to a corresponding load, the control circuit comprising; a controller configured to control an on/off state of the switching elements and switch between a switching mode to switch the switching elements such that the output voltage approaches the target level and a bypass mode to put a switching element existing on a path from the input line to the output line, of the switching elements, in a full-on state and stop switching of the other switching element, wherein the switching mode includes a PWM mode and a PFM mode, wherein, when switching from the bypass mode to the switching mode, a reference voltage indicating a target value of the DC/DC converter in the switching mode starts to smoothly decrease from a value that is larger than a normal value to the normal value, allowing the output voltage to decrease to the normal value while following the reference voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification