Microcontroller with integral switch mode power supply controller

• US 6,456,044 B1
• Filed: 01/31/2001
• Issued: 09/24/2002
• Est. Priority Date: 02/16/1999
• Status: Expired due to Term

• Current Assignee: Microchip Technology Incorporated
• Original Assignee: Microchip Technology Incorporated
• Inventors: Darmawaskita, Hartono
• Primary Examiner(s): Toatley, Jr., Gregory J.
• Assistant Examiner(s): LUK, LAWRENCE W
• Application Number:
  US09/773,439
• Time in Patent Office: 601 Days
• Field of Search: 320/139, 320/137, 320/141, 320/127, 320/129
• US Class Current: 320/139
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters

Abstract

A single integrated circuit package for controlling the charging circuits of a battery charger. The single integrated circuit package comprises a microcontroller, switch mode power supply controller(s), analog to digital converter and analog input multiplexer which may be fabricated on a single integrated circuit die, or the microcontroller may be on one integrated circuit die, and the remaining aforementioned circuits may be on a second integrated circuit die. The switch mode power supply controller is adapted for connection to a power converter which is used to control the voltage and/or current to a battery being charged. The power converter may also be on the same integrated circuit die as the switch mode power supply controller, or may be on a separate semiconductor die but included in the single integrated circuit package. Single or multiple batteries may be charged using charging algorithms specifically tailored to each battery. Batteries being charged may have a different capacity, voltage, or chemistry type. State of charge and time to reach a fully charged condition for each battery may also be different.

Claims

1. An apparatus for battery charger logic and control, said apparatus comprising:

a microcontroller;

a switch mode power supply controller;

an analog to digital converter connected to said microcontroller, and

an analog input multiplexer connected to said analog to digital converter, said analog input multiplexer having a plurality of analog inputs which are adapted to receive a plurality of condition values from a battery,

wherein said microcontroller, said switch mode power supply controller, said analog to digital converter, and said analog input multiplexer are fabricated on a single integrated circuit die;

said switch mode power supply controller having at least one analog input, at least one setpoint input, and an output adapted for controlling a power converter which charges the battery;

said at least one setpoint input of said switch mode power supply controller receiving at least one setpoint from said microcontroller, and

said at least one analog input of said switch mode power supply controller adapted to receive at least one parameter signal from the power converter.

2. The apparatus of claim 1, wherein the at least one parameter signal from the power converter is a signal proportional to the amount of current being drawn by the battery.

3. The apparatus of claim 1, wherein the at least one parameter signal from the power converter is a signal proportional to the amount of voltage being applied to the battery.

4. The apparatus of claim 1, wherein the at least one parameter signal from the power converter is a signal proportional to the amount of voltage being applied to the battery and another signal proportional to the amount of current being drawn by the battery.

5. The apparatus of claim 1, wherein the output of said switch mode power supply controller is a switched signal.

6. The apparatus of claim 5, wherein the switched signal from the output of said switch mode power supply controller comprises pulse-width modulation.

7. The apparatus of claim 5, wherein the switched signal from the output of said switch mode power supply controller comprises pulse-position modulation.

8. The apparatus of claim 5, wherein the switched signal from the output of said switch mode power supply controller comprises pulse-skipping modulation.

9. The apparatus of claim 1, wherein said switch mode power supply controller uses a constant voltage mode to maintain a constant voltage on the battery.

10. The apparatus of claim 1, wherein said switch mode power supply controller uses a constant current mode to maintain a constant current to the battery.

11. The apparatus of claim 1, wherein said switch mode power supply controller uses a constant voltage with current compliance mode to maintain a constant voltage on the battery unless a current parameter signal from the power converter exceeds a current setpoint from said microcontroller, then a constant current to the battery is maintained so as not to exceed the current setpoint.

12. The apparatus of claim 1, further comprising an output adapted for controlling a power transfer switch connected between the power converter, the battery and at least one other battery.

13. The apparatus of claim 1, further comprising an integrated circuit package enclosing said integrated circuit die.

14. The apparatus of claim 13, wherein the integrated circuit package is selected from a group consisting of plastic dual in-line package (PDIP), small outline (SO), shrink small outline package (SSOP), thin shrink small outline package (TSSOP), windowed ceramic dual in-line package (CERDIP), leadless chip carrier (LCC), plastic leaded chip carrier (PLCC), plastic quad flatpack package (PQFP), thin quad flatpack package (TQFP), pin grid array (PGA), ball grid array (BGA), TO-220, T0-247 and T0-263.

15. The apparatus of claim 1, wherein the power converter is fabricated on said single integrated circuit die.

16. The apparatus of claim 1, wherein said switch mode power supply controller is a plurality of switch mode power supply controllers.

17. The apparatus of claim 13, wherein the power converter is enclosed in said integrated circuit package.

18. An apparatus for battery charger logic and control, said apparatus comprising:

a microcontroller;

at least one switch mode power supply controller;

an analog to digital converter connected to said microcontroller; and

an analog input multiplexer connected to said analog to digital converter, said analog input multiplexer having a plurality of analog inputs which are adapted to receive a plurality of condition values from at least one battery,

wherein said microcontroller, said at least one switch mode power supply controller, said analog to digital converter, and said analog input multiplexer are fabricated on a single integrated circuit die;

said at least one switch mode power supply controller having at least one analog input, at least one setpoint input, and at least one output adapted for controlling at least one power converter which charges the at least one battery;

said at least one setpoint input of said at least one switch mode power supply controller receiving at least one setpoint from said microcontroller, and

said at least one analog input of said at least one switch mode power supply controller adapted to receive at least one parameter signal from the at least one power converter.

19. The apparatus of claim 18, wherein the at least one power converter is fabricated on said single integrated circuit die.

20. An apparatus for battery charger logic and control, said apparatus comprising:

a microcontroller;

a plurality of switch mode power supply controllers;

an analog to digital converter connected to said microcontroller; and

an analog input multiplexer connected to said analog to digital converter, said analog input multiplexer having a plurality of analog inputs which are adapted to receive a plurality of condition values from a plurality of batteries,

wherein said microcontroller is fabricated on a first integrated circuit die, and said plurality of switch mode power supply controllers, said analog to digital converter, and said analog input multiplexer are fabricated on a second integrated circuit die;

said plurality of switch mode power supply controllers having a plurality of analog inputs, a plurality of setpoint inputs, and a plurality of outputs adapted for controlling a plurality of power converters which charge the plurality of batteries;

said plurality of setpoint inputs of said plurality of switch mode power supply controllers receiving a plurality of setpoints from said microcontroller;

said plurality of analog inputs of said plurality of switch mode power supply controllers adapted to receive a plurality of parameter signals from the plurality of power converters; and

said first and second integrated circuit dice having connections therebetween and being encapsulated in an integrated circuit package.

21. The apparatus of claim 20, wherein the plurality of power converters are fabricated on said second integrated circuit die.

22. A system for charging at least one battery, said system comprising:

a microcontroller;

at least one switch mode power supply controller;

an analog to digital converter connected to said microcontroller;

an analog input multiplexer connected to said analog to digital converter, said analog input multiplexer having a plurality of analog inputs which are adapted to receive a plurality of condition values from at least one battery, and

at least one power converter adapted for connection to the at least one battery;

wherein said microcontroller, said at least one switch mode power supply controller, said analog to digital converter, and said analog input multiplexer are fabricated on a single integrated circuit die;

said at least one switch mode power supply controller having at least one analog input, at least one setpoint input, and at least one output for controlling said at least one power converter which charges the at least one battery;

said at least one setpoint input of said at least one switch mode power supply controller receiving at least one setpoint from said microcontroller; and

said at least one analog input of said at least one switch mode power supply controller receives at least one parameter signal from the at least one power converter.

23. The system of claim 22, wherein the at least one power converter is fabricated on said single integrated circuit die.

24. The system of claim 22, further comprising an integrated circuit package enclosing said single integrated circuit die.

25. The system of claim 22, further comprising an integrated circuit package enclosing said single integrated circuit die and the at least one power converter.

26. The system of claim 23, further comprising an integrated circuit package enclosing said single integrated circuit die.

27. A system for charging a plurality of batteries, said system comprising:

a microcontroller;

a plurality of switch mode power supply controllers;

an analog to digital converter connected to said microcontroller; and

an analog input multiplexer connected to said analog to digital converter, said analog input multiplexer having a plurality of analog inputs which are adapted to receive a plurality of condition values from a plurality of batteries; and

a plurality of power converters adapted for connection to the plurality of batteries;

wherein said microcontroller is fabricated on a first integrated circuit die, and said plurality of switch mode power supply controllers, said analog to digital converter, and said analog input multiplexer are fabricated on a second integrated circuit die;

said plurality of switch mode power supply controllers having a plurality of analog inputs, a plurality of setpoint inputs, and a plurality of outputs for controlling the plurality of power converters which charge the plurality of batteries;

said plurality of setpoint inputs of said plurality of switch mode power supply controllers receiving a plurality of setpoints from said microcontroller;

said plurality of analog inputs of said plurality of switch mode power supply controllers receiving a plurality of parameter signals from the plurality of power converters; and

said first and second integrated circuit dice having connections therebetween and being encapsulated in an integrated circuit package.

28. The system of claim 27, wherein the plurality of power converters are fabricated on said second integrated circuit die.

29. The system of claim 27, further comprising the plurality of power converters being encapsulated in said integrated circuit package.