Power management circuit for a portable electronic device including USB functionality and method for doing the same
First Claim
1. A power management circuit for a portable electronic device comprising an internal battery chargeable either through a first interface or through an AC-DC conversion circuit, said power management circuit comprising:
- a first buck/boost converter having a Switched Mode Power Supply (SMPS) mode which is configured to be controlled either in a buck or a boost mode, said first buck/boost converter being associated with a first external coil for embodying a battery charging circuit where the internal battery is chargeable through the first interface;
a second buck/boost converter having a Switched Mode Power Supply (SMPS) mode configured to be controlled either in a buck or a boost mode, said second buck/boost converter being associated with a second external coil for embodying a second battery charging circuit where said internal battery is chargeable through the AC/DC conversion circuit;
a by-pass circuit for performing a by-pass of either the voltage of said internal battery or of the voltage generated by said buck/boost controllers converters when in the boost mode to a second interface, controlled by a control signal; and
a control circuit for controlling the Switched Mode Power Supply (SMPS) mode of said first and second buck/boost converters and for controlling said by-pass circuit so as to generate a converted voltage to said second interface.
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Accused Products
Abstract
A Power Management Circuit for a portable electronic device comprising an internal battery to be charged either through a first interface or through an AC_DC conversion circuit. The circuit comprises a first buck/boost converter having a Switched Mode Power Supply (SMPS) mode which can be controlled either in a buck or a boost mode, said first buck/boost controller being associated with a first external coil for the purpose of embodying a battery charging circuit through a first interface (USB). The circuit further comprises a second buck/boost converter which can also be controlled either in a buck or a boost mode. Bypass circuits are used for performing, under control of a control circuit, the bypass of either the voltage of the battery or the voltage generated by said buck/boost controllers when in boost mode to a second interface (SIM/MMC).
22 Citations
12 Claims
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1. A power management circuit for a portable electronic device comprising an internal battery chargeable either through a first interface or through an AC-DC conversion circuit, said power management circuit comprising:
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a first buck/boost converter having a Switched Mode Power Supply (SMPS) mode which is configured to be controlled either in a buck or a boost mode, said first buck/boost converter being associated with a first external coil for embodying a battery charging circuit where the internal battery is chargeable through the first interface; a second buck/boost converter having a Switched Mode Power Supply (SMPS) mode configured to be controlled either in a buck or a boost mode, said second buck/boost converter being associated with a second external coil for embodying a second battery charging circuit where said internal battery is chargeable through the AC/DC conversion circuit; a by-pass circuit for performing a by-pass of either the voltage of said internal battery or of the voltage generated by said buck/boost controllers converters when in the boost mode to a second interface, controlled by a control signal; and a control circuit for controlling the Switched Mode Power Supply (SMPS) mode of said first and second buck/boost converters and for controlling said by-pass circuit so as to generate a converted voltage to said second interface. - View Dependent Claims (2, 3, 4, 5, 7)
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6. A portable terminal equipment comprising a power management circuit including an internal battery which can be charged either through a USB interface or an AC/DC interface, said power management circuit comprising:
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a first buck/boost converter having a Switched Mode Power Supply (SMPS) mode configured to be controlled either in a buck or a boost mode, said first buck/boost converter being associated with a first external coil for embodying a battery charging circuit where the internal battery is chargeable through the first interface; a second buck/boost converter having a Switched Mode Power Supply (SMPS) mode configured to be controlled either in a buck or a boost mode, said second buck/boost converter being associated with a second external coil for embodying a second battery charging circuit where said internal battery is chargeable through the AC/DC interface; a by-pass circuit for performing a by-pass of either the voltage of said internal battery or the voltage generated by said buck/boost converters when in the boost mode to a second interface, controlled by a control signal; and a controlling circuit for controlling the Switched Mode Power Supply (SMPS) mode of said first and second buck/boost converters and also for controlling said by-pass circuit so as to generate a converted voltage to said second interface.
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8. A method for generating the power management of a portable electronic device comprising an internal battery chargeable either through a USB interface or through an AC/DC interface, said method comprising the steps of:
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arranging a first buck/boost converter associated with a first external coil for embodying a battery charging circuit where the internal battery is chargeable through the USB interface, wherein said buck/boost converter also achieves a DC/DC up voltage conversion for converting the voltage from the internal battery to said USB interface so as to supply current to a peripheral unit connected to said USB interface; arranging a second buck/boost converter associated with a second external coil for embodying a second battery charging circuit where said internal battery is chargeable through the AC/DC interface; arranging said second buck/boost converter so as to perform boost conversion of the voltage of the internal battery to generate a higher voltage; by-passing the voltage of the internal battery, or the voltage generated by one of the two buck/boost converters responsive to a control signal; sensing the voltage of the internal battery as well as the voltage appearing from said USB interface and said AC/DC interface; and generating said control signal in response to said sensing of the voltage of the internal battery to provide the higher voltage to another interface. - View Dependent Claims (9, 10, 11, 12)
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Specification