System and method for automated detection of battery insert
First Claim
1. A battery connection detection circuit disposed within a battery having connectors for connecting the battery to an equipment to be powered by the battery, for isolating the battery from the battery connectors to prevent a voltage across the connectors when the battery is not connected to the equipment, comprising:
- a first reference voltage source and a second reference voltage source;
a detection line driven high by the first reference voltage source;
a comparison circuit for battery connection detection for comparing a signal from the second voltage source to a signal on the detection line, wherein an output for the comparison circuit goes low when the signal on the detection line goes low;
a polarity independent voltage limiting circuit connected between the detection line and the comparison circuit; and
a switch controlled by the comparison circuit for isolating the battery from the battery connectors to prevent a voltage across the connectors when the battery is not connected to the equipment, the switch has a low internal resistance.
1 Assignment
0 Petitions
Accused Products
Abstract
A rechargeable power cell having no voltage across its positive and negative power terminals unless the power cell is inserted into a device configured to accept the power cell is described. The power cell includes a battery management processor and battery insertion detection circuitry that cooperate to determine when the power cell is inserted into the device and then drive an electronic switch to provide for conduction of current from the power cell to the positive terminal of the cell.
-
Citations
21 Claims
-
1. A battery connection detection circuit disposed within a battery having connectors for connecting the battery to an equipment to be powered by the battery, for isolating the battery from the battery connectors to prevent a voltage across the connectors when the battery is not connected to the equipment, comprising:
-
a first reference voltage source and a second reference voltage source; a detection line driven high by the first reference voltage source; a comparison circuit for battery connection detection for comparing a signal from the second voltage source to a signal on the detection line, wherein an output for the comparison circuit goes low when the signal on the detection line goes low; a polarity independent voltage limiting circuit connected between the detection line and the comparison circuit; and a switch controlled by the comparison circuit for isolating the battery from the battery connectors to prevent a voltage across the connectors when the battery is not connected to the equipment, the switch has a low internal resistance. - View Dependent Claims (2)
-
-
3. A rechargeable battery for use in a medical device, comprising:
-
a battery pack having at least one battery cell; a connector disposed on the battery pack, the connector having a positive terminal and a negative terminal in electrical communication with a positive side and a negative side of the at least one battery cell respectively, the connector also have a detection terminal configured to engage a corresponding terminal in a device to be powered by the battery pack; a switch disposed between the positive side of the at least one battery cell and the positive terminal of the connector; a battery management processor disposed in the battery pack in electrical communication with the battery cell and the switch, the battery management processor programmed to open the switch to isolate the at least one battery cell from the positive terminal to prevent a voltage across the positive and negative terminals when the battery is not inserted into a device configured to accept the battery pack; a polarity independent voltage limiting circuit in electrical communication with the detection terminal; a battery detection circuit disposed in the battery pack in electrical communication with the polarity independent voltage limiting circuit, the battery detection circuit configured to provide a battery detection signal to the battery management processor when the battery pack is inserted into a device configured to accept the battery pack, the battery detection circuit including a first reference voltage source and a second reference voltage source, a detection line driven high by the first reference voltage source, and a comparison circuit for comparing a signal from the second reference voltage source to a signal on the detection line; and wherein the battery management processor provides a signal to the switch to control the switch in response to the battery detection signal to allow current to flow through the switch from the positive side of the at least one battery cell to the positive terminal of the connector. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification