Precise voltage positioning using dc-dc converter
AssigneeAnalog Devices, Inc.
InventorJun Zhao
Life of this patent
Estimating the term…
Abstract
Techniques to control the start point of an output voltage of a power supply for a short period after receive a “stop switching” signal, which will switch a DC-DC switching regulator from a pulse width modulation (PWM) mode to a linear mode to precisely position the output voltage at a certain level. In this way, the power supply can remove any output ripple caused by the PWM mode and can minimize or remove the sampling error to a low-power system in every cycle. In addition, the power supply can intelligently communicate a “power ready” signal back to the system, resulting in a synchronized system.
Claims21
A method of controlling operation of a power supply, the method comprising:
- generating an output voltage using a switched-mode power conversion of the power supply;
- upon receipt of a first level of a first signal, stopping the generating using the switched-mode power conversion;
- after stopping the generating using the switched-mode power conversion, generating the output voltage using a linear regulation of the power supply;
- and
- adjusting the linear regulation based on a second signal to generate a specified output voltage, wherein the second signal includes a voltage feedback signal.
A power supply comprising:
- a switching regulator;
- a linear regulator;
- and
- a controller configured to:
- generate an output voltage using a switched-mode power conversion of the switching regulator;
- upon receipt of a first level of a first signal, stop generating the output voltage using the switched-mode power conversion;
- after stopping the generating using the switched-mode power conversion, generate the output voltage using a linear regulation of the linear regulator;
- and
- adjust the linear regulation based on a second signal to generate a specified output voltage, wherein the second signal includes a voltage feedback signal.
A power supply circuit comprising:
- means for generating an output voltage using a switched-mode power conversion of the power supply;
- upon receipt of a first level of a first signal, means for stopping the generating using the switched-mode power conversion;
- after stopping the generating using the switched-mode power conversion, means for generating the output voltage using a linear regulation of the power supply;
- and
- means for adjusting the linear regulation based on a second signal to generate a specified output voltage, wherein the second signal includes a voltage feedback signal.
Dependencies are inferred from the claim text.