Multiple battery, multiple rate battery charger

• US 5,028,859 A
• Filed: 06/05/1989
• Issued: 07/02/1991
• Est. Priority Date: 06/05/1989
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Johnson, Robert M., Kiem, Joshua P.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): Peckman, Kristine
• Application Number:
  US07/361,534
• Time in Patent Office: 757 Days
• Field of Search: 320/2, 320/6, 320/15, 320/19, 320/20, 320/21, 320/22, 320/35, 320/39
• US Class Current: 320/125
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: Y10S 320/19 Charger status, e.g. voltmeter

Abstract

A multiple battery, multiple rate automatic switching battery charger is disclosed. Two or more batteries are charged sequentially in a multiple pocket battery chargers in order to maintain a low peak power consumption level. One battery pocket is assigned a priority so that a battery placed therein will be charged first at a fast rate of charge. Upon completion of the fast charge cycle, the priority battery can be trickle charged during the fast charge of the non-priority pocket battery.

Claims

1. A battery charger for charging at least two rechargeable batteries, comprising:

first means for receiving a first battery and second means for receiving a second battery;

interruptible means for supplying a first charging current to said first battery when said first battery is disposed in said first means for receiving;

means for detecting the presence of said second battery in said second means for receiving; and

means, responsive to said means for detecting the presence of said second battery, for supplying a second charging current to said second battery and for interrupting said first charging current while said second charging current is being supplied.

2. A battery charger in accordance with claim 1 further comprising means for supplying to said first battery a third charging current having a smaller magnitude than said first charging current.

3. A battery charger in accordance with claim 2 wherein said means for interrupting said first charging current further comprises means for simultaneously charging said first battery with said third charging current and said second battery with said second charging current until said second battery has completed charging with said second charging current and means for reconnecting said means for supplying said first charging current to said first battery when said second battery has completed charging with said second charging current.

4. A battery charger in accordance with claim 3 further comprising means for simultaneously supplying to said second battery a fourth charging current having a smaller magnitude than said second charging current and supplying said first charging current to said first battery after said second battery has completed charging with said second charging current.

5. A battery charger in accordance with claim 3 further comprising means for providing a user perceptible indication of which battery is being charged and whether said first battery is being charged with said first charging current or said third charging current.

6. A battery charger in accordance with claim 1 further comprising means for supplying to said second battery a fourth charging current having a smaller magnitude than said second charging current.

7. A battery charger in accordance with claim 6 wherein said means for interrupting said first charging current further comprises means for reconnecting said means for supplying said first charging current to said first battery when said second battery has completed charging with said second charging current and means for supplying said second battery with said fourth charging current simultaneous with said supplying said first charging current.

8. A battery charger in accordance with claim 7 further comprising means for providing a user perceptible indication of which battery is being charged and whether said second battery is being charged with said second charging current or said fourth charging current.

9. A battery charger in accordance with claim 1 wherein said means for interrupting said first charging current further comprises means for placing said interruptible means in a waiting state until said second battery has completed charging with said second charging current and means for reconnecting said means for supplying said first charging current to said first battery when said second battery has completed charging with said second charging current.

10. A battery charger in accordance with claim 9 further comprising means for providing a user perceptible indication of which battery is being charged and whether said first battery is being charged with said first charging current or is in a waiting state.

11. A battery charger in accordance with claim 1 further comprising means for providing a user perceptible indication of which battery is being charged.

12. A method of charging at least two batteries, comprising the steps of:

receiving a first battery in a first charging pocket;

interruptibly supplying a first charging current to said first battery;

receiving a second battery in a second charging pocket;

detecting the presence of said second battery in said second charging pocket; and

supplying a second charging current to said second battery and interrupting said first charging current while said second charging current is being supplied in response to said detection of the presence of said second battery.

13. A method in accordance with the method of claim 12 further comprising the step of supplying to said first battery a third charging current having a smaller magnitude than said first charging current.

14. A method in accordance with the method of claim 13 wherein said step of interrupting said first charging current further comprises the steps of simultaneously charging said first battery with said third charging current and said second battery with said second charging current until said second battery has completed charging with said second charging current and reconnecting said means for supplying said first charging current to said first battery when said second battery has completed charging with said second charging current.

15. A method in accordance with the method of claim 14 further comprising the step of simultaneously supplying to said second battery a fourth charging current having a smaller magnitude than said second charging current and supplying said first charging current to said first battery after said second battery has completed charging with said second charging current.

16. A method in accordance with the method of claim 14 further comprising the step of providing a user perceptible indication of which battery is being charged and whether said first battery is being charged with said first charging current or said third charging current.

17. A method in accordance with the method of claim 12 further comprising the step of supplying to said second battery a fourth charging current having a smaller magnitude than said second charging current.

18. A method in accordance with the method of claim 17 wherein said step of interrupting said first charging current further comprises the steps of reconnecting said first charging current to said first battery when said second battery has completed charging with said second charging current and supplying said second battery with said fourth charging current simultaneously with said supplying said first charging current.

19. A method in accordance with the method of claim 18 further comprising the step of providing a user perceptible indication of which battery is being charged and whether said second battery is being charged with said second charging current or said fourth charging current.

20. A method in accordance with the method of claim 12 wherein said step of interrupting said first charging current further comprises the steps of placing said interruptible means in a waiting state until said second battery has completed charging with said second charging current and reconnecting said means for supplying said first charging current to said first battery when said second battery has completed charging with said second charging current.

21. A method in accordance with the method of claim of 20 further comprising the step of providing a user perceptible indication of which battery is being charged and whether said first battery is being charged with said first charging current or is in a waiting state.

22. A method in accordance with the method of claim 12 further comprising the step of providing a user perceptible indication of which battery is being charged.