Battery pack control circuit for handheld battery operated device
First Claim
1. A battery pack control circuit operable with interchangeable first or second battery packs, each having a different battery chemistry and first and second terminals for connecting to said control circuit, comprising:
- first and second drive circuits respectively coupled to first and second operative loads;
first and second user-operable control switches in said battery pack control circuit for controlling operating modes of said first and second operative loads;
a control processor coupled at outputs thereof to inputs of said first and second drive circuits and having first and second signal terminals respectively coupled-to and responsive to the operating state of said first and second switches, said control processor further having a sense terminal responsive to a terminal voltage of said interchangeable first and second battery packs; and
a program operative in said control processor to select the level of a drive current to each of said first and second drive circuits responsive to said terminal voltage, said operating state of said first and second switches, and an operating state of said first and second operative loads.
2 Assignments
0 Petitions
Accused Products
Abstract
A heat sink for a handheld device is formed as a one piece chassis for supporting heat-producing circuits inside the device while having heat radiating surfaces outside the device. In another embodiment a battery pack control circuit under microprocessor control allows battery packs having different battery chemistries and characteristics to be interchanged in the same device without switches or adapters. Control of operating modes of the device despite changes in the battery pack including battery chemistry, state of charge, available voltage, or desired operating mode are automatic. The microprocessor measures the battery pack characteristics, using look up tables in a suitable program to adjust the circuit operating modes. The microprocessor also responds to sequential switch contact closures in setting operating modes.
-
Citations
17 Claims
-
1. A battery pack control circuit operable with interchangeable first or second battery packs, each having a different battery chemistry and first and second terminals for connecting to said control circuit, comprising:
-
first and second drive circuits respectively coupled to first and second operative loads; first and second user-operable control switches in said battery pack control circuit for controlling operating modes of said first and second operative loads; a control processor coupled at outputs thereof to inputs of said first and second drive circuits and having first and second signal terminals respectively coupled-to and responsive to the operating state of said first and second switches, said control processor further having a sense terminal responsive to a terminal voltage of said interchangeable first and second battery packs; and a program operative in said control processor to select the level of a drive current to each of said first and second drive circuits responsive to said terminal voltage, said operating state of said first and second switches, and an operating state of said first and second operative loads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification