Power Management Circuit for a Portable Electronic Device Including USB Functionality and Method for Doing the Same

• US 20130154550A1
• Filed: 08/25/2011
• Published: 06/20/2013
• Est. Priority Date: 08/26/2010
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: ST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
• Inventors: Balmefrezol, Alexandre, Milazzo, Patrizia, Platania, Giuseppe, Polisi, Vicenzo
• Granted Patent: US 9,203,254 B2
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2207/40 adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence

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).

Claims

1-13. -13. (canceled)

14. A power management circuit for a portable electronic device comprising an internal battery chargable either through a first interface or through an AC-DC conversion circuit, said 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 controller being associated with a first external coil for embodying a battery charging circuit where a battery is chargable through a first interface (USB),

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 controller being associated with a second external coil for embodying a second battery charging circuit where said battery is chargable through an AC/DC interface;

by-pass circuit for performing a by-pass of either the voltage of said battery or of the voltage generated by said buck/boost controllers when in boost mode to a second interface (SIM/MMC), controlled by a control signal; and

control circuit for controlling the Switched Mode Power Supply (SMPS) mode of said first and second buck/boost controller and for controlling said by-pass means so as to generate a converted voltage to said second interface.

15. The power management circuit according to claim 14 characterized in that said first interface is a Universal Bus Interface.

16. The power management circuit according to claim 14 characterized in that said second interface is a SIM interface.

17. The power management circuit according to claim 14 characterized in that said second interface is a MMC interface.

18. The power management circuit according to claim 15 characterized in that said battery is a li-Ion battery.

20. A telecommunication network device characterized in that it includes a power management circuit as in claim 14.

21. A telecommunication network device according to claim 20 characterized in that it is a Portable Assistant Document.

19. 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:

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 controller being associated with a first external coil for embodying a battery charging circuit where a battery is chargeable through a first interface (USB),

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 controller being associated with a second external coil for embodying a second battery charging circuit where said battery is chargeable through an AC/DC interface;

by-pass circuit for performing a by-pass of either the voltage of said battery or the voltage generated by said buck/boost controllers when in boost mode to a second interface (SIM/MMC), controlled by a control signal; and

controlling circuit for controlling the Switched Mode Power Supply (SMPS) mode of said first and second buck/boost controller and also for controlling said by-pass means so as to generate a converted voltage to said second interface.

22. 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:

arranging a first buck/boost converter associated with a first external coil for embodying a battery charging circuit where a battery is chargeable through an USB interface, said buck/boost converter also achieves a DC/DC up voltage conversion for converting the voltage from the battery to said USB interface so as to supply current to a peripheral unit connected to said USB interface;

arranging a second buck converter associated with a second external coil for embodying a second battery charging circuit where said battery is chargeable through an AC/DC interface;

arranging said second buck converter so as to perform boost conversion of the voltage of the battery to generate a higher voltage;

by-passing the voltage of the battery, or the voltage generated by one of the two buck/boost converters controlled by a control signal;

sensing the voltage of the 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 step to bypass the higher voltage to said second interface.

23. The method according to claim 22 characterized in that said battery is a li-Ion battery.

24. The method according to claim 22 characterized in that said second interface is a 3V SIM interface.

25. The method according to claim 22 characterized in that said second interface is a 3V MMC interface.

26. A mobile telephone including circuits for performing the method of claim 22, further including a transceiver for transmitting and receiving wireless signals and a processing circuit for processing the wireless signals.