Regulation of a DC to DC converter
AssigneeFreescale Semiconductor, Inc.
InventorMarcus May
Life of this patent
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Abstract
A method for regulating a DC to DC converter of a portable device begins by sensing deactivation of a non-battery power source of the portable device, wherein an internal supply voltage is derived from the non-battery power source. The method continues by obtaining an initial regulation value for the DC to DC converter, wherein the initial regulation value is based on a battery voltage and the internal supply voltage. The method continues by enabling the DC to DC converter based on the initial regulation value, wherein the DC to DC converter converts the battery voltage into the internal supply voltage such that transitioning from the non-battery power source to a battery power source provides the substantially constant internal supply voltage.
Claims24
A method for regulating a DC to DC converter of a portable device to provide a substantially constant internal supply voltage, the method comprises:
- sensing deactivation of a non-battery power source of the portable device, wherein an internal supply voltage is derived from the non-battery power source;
- obtaining an initial regulation value for the DC to DC converter, wherein the initial regulation value is based on a battery voltage and the internal supply voltage;
- and
- enabling the DC to DC converter based on the initial regulation value, wherein the DC to DC converter converts the battery voltage into the internal supply voltage such that transitioning from the non-battery power source to a battery power source provides the substantially constant internal supply voltage.
A DC to DC converter for use by a portable device comprises:
- energy transfer module;
- switching transistors operably coupled to enable the energy transfer module to produce a internal supply voltage from a battery voltage, wherein the switching transistors are enabled in accordance with regulation control signals;
- feedback module operably coupled to produce a feedback signal based on the internal supply voltage;
- and
- regulation module operably coupled to, in a steady state mode, generate the regulation control signals based on the feedback signal, wherein the regulation module is further operably coupled to, in a initialization mode:
- sense deactivation of a non-battery power source of the portable device, wherein an internal supply voltage is derived from the non-battery power source;
- obtain an initial regulation value for the DC to DC converter, wherein the initial regulation value is based on a battery voltage and the internal supply voltage;
- and
- enable the DC to DC converter based on the initial regulation value, wherein the DC to DC converter converts the battery voltage into the internal supply voltage such that transitioning from the non-battery power source to a battery power source provides the substantially constant internal supply voltage.
A power source circuit for a portable device, wherein the power source circuit comprises:
- a first DC to DC converter, when enabled, operable to convert a non-battery voltage into an internal supply voltage;
- and
- a second DC to DC converter, when enabled, operable to convert a battery voltage into the internal supply voltage, wherein the second DC to DC converter includes:
- energy transfer module;
- switching transistors operably coupled to enable the energy transfer module to produce the internal supply voltage from the battery voltage, wherein the switching transistors are enabled in accordance with regulation control signals;
- feedback module operably coupled to produce a feedback signal based on the internal supply voltage;
- and
- regulation module operably coupled to, in a steady state mode, generate the regulation control signals based on the feedback signal, wherein the regulation module is further operably coupled to, in a initialization mode:
- sense deactivation of the first DC to DC converter;
- obtain an initial regulation value for the DC to DC converter, wherein the initial regulation value is based on a battery voltage and the internal supply voltage;
- and
- enable the DC to DC converter based on the initial regulation value, wherein the DC to DC converter converts the battery voltage into the internal supply voltage such that transitioning from the non-battery power source to a battery power source provides the substantially constant internal supply voltage.
- to DC converter in a force regulation mode based on the initial regulation value.
Dependencies are inferred from the claim text.