Method and system for battery charging employing a semiconductor switch
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-010/46
H01M-010/42
출원번호
US-0322534
(2005-12-30)
등록번호
US-7321219
(2008-01-22)
발명자
/ 주소
Meyer,Gary D.
Rosenbecker,Jay J.
Glasgow,Kevin L.
Johnson,Todd W.
Scheucher,Karl F.
출원인 / 주소
Milwaukee Electric Tool Corporation
대리인 / 주소
Michael Best & Friedrich LLP
인용정보
피인용 횟수 :
12인용 특허 :
62
초록▼
A method and system for battery charging. In some aspects, an electrical combination including a battery charger operable to supply a charging current to a battery to charge the battery and a battery including a switch having an interrupt condition, in which the switch is operable to interrupt a dis
A method and system for battery charging. In some aspects, an electrical combination including a battery charger operable to supply a charging current to a battery to charge the battery and a battery including a switch having an interrupt condition, in which the switch is operable to interrupt a discharge current from the battery. The battery is electrically connectable to the battery charger and the supply of the charging current from the battery charger to the battery is enabled when the switch is in the interrupt condition.
대표청구항▼
The invention claimed is: 1. An electrical combination comprising: a battery charger operable to supply a charging current to a battery pack to charge the battery pack; and a battery pack including a switch having an interrupt condition, in which the switch is operable to interrupt a discharge curr
The invention claimed is: 1. An electrical combination comprising: a battery charger operable to supply a charging current to a battery pack to charge the battery pack; and a battery pack including a switch having an interrupt condition, in which the switch is operable to interrupt a discharge current from the battery pack and enable the supply of the charging current to the battery pack from the battery charger, the battery pack being electrically connectable to the battery charger, the battery pack further including a battery cell and a microcontroller operable to control the switch, the microcontroller having an operating voltage threshold and configured to receive an input voltage, the microcontroller being operable when the received input voltage is one of equal to and greater than the operating voltage threshold, and wherein, when the received input voltage is below the operating voltage threshold, the switch is configured to enable a supply of charging current from the battery charger to the battery cell. 2. The electrical combination as set forth in claim 1 wherein the switch includes a FET, the FET having an interrupt condition, in which the FET is operable to interrupt a discharge current from the battery pack, the FET including a body diode, the supply of the charging current from the battery charger to the battery pack being enabled through the body diode when the FET is in the interrupt condition. 3. The electrical combination as set forth in claim 2 wherein the microcontroller is operable to control the switch between the interrupt condition and a second condition, in which a current is suppliable through the switch. 4. The electrical combination as set forth in claim 3 wherein the battery cell is operable to supply the input voltage to the microcontroller. 5. The electrical combination as set forth in claim 4 wherein the microcontroller is operable to change the switch from the interrupt condition to the second condition when the battery pack is electrically connected to the battery charger and when an input voltage one of equal to and greater than the operating voltage threshold is supplied to the microcontroller. 6. The electrical combination as set forth in claim 5 wherein, in the second condition, charging current is suppliable through the switch to the battery cell to charge the battery cell. 7. The electrical combination as set forth in claim 5 wherein, when the battery pack is electrically connected to the battery charger and when an input voltage less than the operating voltage threshold is supplied to the microcontroller, the microcontroller is not operable to change the switch from the interrupt condition to the second condition. 8. The electrical combination as set forth in claim 7 wherein the supply of the charging current from the battery charger to the battery pack when the switch is in the interrupt condition increases the input voltage supplied to the microcontroller to one of equal to and greater than the operating voltage threshold. 9. The electrical combination as set forth in claim 8 wherein, thereafter, the microcontroller is operable to change the switch from the interrupt condition to the second condition. 10. The electrical combination as set forth in claim 9 wherein, thereafter, in the second condition, charging current is suppliable through the switch to the battery cell to charge the battery cell. 11. A method of operating an electrical combination, the electrical combination including a battery charger operable to supply a charging current to a battery pack, and a battery pack including a switch having an interrupt condition, in which the switch is operable to interrupt a discharge current from the battery pack, the battery pack being electrically connectable to the battery charger, the battery pack further including a battery cell and a microcontroller operable to control the switch, the microcontroller having an operating voltage threshold and configured to receive an input voltage, said method comprising the acts of: enabling the supply of the charging current from the battery charger to the battery pack when the switch is in the interrupt condition; operating the microcontroller when the received input voltage is one of equal to and greater than the operating voltage threshold; and when the received input voltage is below the operating voltage threshold, enabling, by the switch, a supply of charging current from the battery charger to the battery cell. 12. The method as set forth in claim 11 wherein the switch includes a FET, the FET having an interrupt condition, in which the FET is operable to interrupt a discharge current from the battery pack, the FET including a body diode, and wherein said method further comprises the act of enabling the supply of the charging current from the battery charger to the battery pack through the body diode when the FET is in the interrupt condition. 13. The method as set forth in claim 11 and further comprising the act of controlling the switch between the interrupt condition and a second condition, in which a current is suppliable through the switch. 14. The method as set forth in claim 11 wherein the battery cell is operable to supply the input voltage to the microcontroller. 15. The method as set forth in claim 14 and further comprising the act of, with the microcontroller, changing the switch from the interrupt condition to a second condition, in which a current is suppliable through the switch, when the battery pack is electrically connected to the battery charger and when an input voltage one of equal to and greater than the operating voltage threshold is supplied to the microcontroller. 16. The method as set forth in claim 15 and further comprising, when the switch is in the second condition, the act of supplying charging current through the switch to the battery cell to charge the battery cell. 17. The method as set forth in claim 14 wherein, when the battery pack is electrically connected to the battery charger and when an input voltage less than the operating voltage threshold is supplied to the microcontroller, the microcontroller is not operable to change the switch from the interrupt condition to the second condition, and wherein said method further comprises the act of increasing the input voltage supplied by the battery cell to the microcontroller to one of equal to and greater than the operating voltage threshold. 18. The method as set forth in claim 17 and further comprising, after the increasing act, the act of, with the microcontroller, changing the switch from the interrupt condition to the second condition. 19. The method as set forth in claim 18 and further comprising, after the changing act, the act of supplying charging current through the switch to the battery cell to charge the battery cell. 20. A battery pack comprising: a battery cell operable to supply a discharge current; a switch having an interrupt condition, in which the switch is operable to interrupt the discharge current from the battery cell, and a second condition; and a microcontroller operable to control the switch, the microcontroller having an operating voltage threshold and configured to receive an input voltage, the microcontroller being operable when the received input voltage is one of equal to and greater than the operating voltage threshold, wherein the battery rack is electrically connectable to a battery charger, the supply of charging current from the battery charger to the battery cell being enabled when the switch is in the interrupt condition, charging current being suppliable through the switch when the switch is in the second condition, and wherein, when the received input voltage is below the operating voltage threshold, the switch is configured to enable a supply of charging current from the battery charger to the battery cell. 21. The battery pack as set forth in claim 20 wherein the switch includes a FET, the FET having an interrupt condition, in which the FET is operable to interrupt a discharge current from the battery pack, and a second condition, in which current is suppliable through the FET, the FET including a body diode, the supply of the charging current from the battery charger to the battery cell being enabled through the body diode when the FET is in the interrupt condition, charging current being suppliable through the FET when the FET is in the second condition. 22. An electrical combination comprising: a battery charger operable to supply a first charging current to a battery pack and operable to supply a second charging current to the battery pack to charge the battery pack, the second charging current being less than the first charging current; and a battery pack being electrically connectable to the battery charger, the battery pack including a microcontroller and a switch having an interrupt condition, in which the switch is operable to interrupt a supply of discharge current from the battery pack and operable to prevent a supply of the first charging current from the battery charger to the battery pack, the switch being operable to enable a supply of the second charging current from the battery charger to the battery pack when the switch is in the interrupt condition. 23. The electrical combination as set forth in claim 22 wherein the switch includes a FET, the FET having an interrupt condition, in which the FET is operable to interrupt a discharge current from the battery pack, the FET including a body diode, the supply of the second charging current from the battery charger to the battery pack being enabled through the body diode when the FET is in the interrupt condition. 24. The electrical combination as set forth in claim 22 wherein the battery pack includes a microcontroller operable to control the switch. 25. The electrical combination as set forth in claim 24 wherein the microcontroller is operable to control the switch between the interrupt condition and a second condition, in which a current is suppliable through the switch. 26. The electrical combination as set forth in claim 25 wherein the battery pack includes a battery cell operable to supply a voltage to the microcontroller, and wherein the microcontroller has an operating voltage threshold, the microcontroller being operable when the battery cell supplies a voltage to the microcontroller one of equal to and greater than the operating voltage threshold. 27. The electrical combination as set forth in claim 26 wherein the microcontroller is operable to change the switch from the interrupt condition to the second condition when the battery pack is electrically connected to the battery charger and when a voltage one of equal to and greater than the operating voltage threshold is supplied to the microcontroller. 28. The electrical combination as set forth in claim 27 wherein, in the second condition, the first charging current is suppliable through the switch to the battery cell to charge the battery cell. 29. The electrical combination as set forth in claim 27 wherein, when the battery pack is electrically connected to the battery charger and when a voltage less than the operating voltage threshold is supplied to the microcontroller, the microcontroller is not operable to change the switch from the interrupt condition to the second condition. 30. A method of charging a battery pack, the battery pack including a microcontroller, at least one battery cell, and a switch, the microcontroller having an operating voltage threshold, the method comprising the acts of: preventing a supply of a first charging current from a battery charger to the battery pack when the switch is in an interrupt condition; enabling a supply of a second charging current from the battery charger to the battery pack when the switch is in the interrupt condition, the second charging current being less than the first charging current; and charging the at least one battery cell with the second charging current to a state of charge at least one of equal to and greater than the operating voltage threshold of the microcontroller. 31. The method of charging a battery pack as set forth in claim 30 and further comprising the act of enabling a supply of the first charging current from a battery charger to the battery pack when the switch is in a second condition. 32. The method of charging a battery pack as set forth in claim 30 and further comprising the act of controlling the switch to change from the interrupt condition to the second condition when the state of charge of the at least one battery cell is at least one of equal to and greater than the operating state of charge threshold. 33. The method of charging a battery pack as set forth in claim 32 wherein the act of controlling the switch is performed by the microcontroller. 34. The method of charging a battery pack as set forth in claim 32 and further comprising the act of enabling the supply of the first charging current from a battery charger to the battery pack when the switch is in the second condition. 35. The method of charging a battery pack as set forth in claim 34 and further comprising the act of charging the at least one battery cell with the first charging current to a state of charge equaling a full state of charge threshold. 36. The method of charging a battery pack as set forth in claim 30 and further comprising the act of enabling the supply of the first charging current from a battery charger to the battery pack when the state of charge of the at least one battery cell is at least one of equal to and greater than the operating state of charge threshold of the microcontroller. 37. The method of charging a battery pack as set forth in claim 30 wherein the switch includes a FET, the FET having an interrupt condition, in which the FET is operable to interrupt a discharge current from the battery pack, the FET including a body diode, and wherein the method further comprises the act of enabling the supply of the second charging current from the battery charger to the battery pack through the body diode when the FET is in the interrupt condition.
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