Power source coupling and decoupling in medical device
First Claim
Patent Images
1. A medical device comprising:
- a switch circuit comprising a source terminal, a drain terminal, and a gate terminal, wherein the source terminal is coupled to a power source;
a switch circuit controller coupled directly to the drain terminal and the gate terminal of the switch circuit and configured to;
monitor a voltage at the drain terminal of the switch circuit, andoutput a voltage to the gate terminal of the switch circuit to transition the switch circuit from a closed state to an open state when the voltage at the drain terminal of the switch circuit is less than a predetermined voltage threshold; and
a switch state selector comprising;
a sense resistor coupled to the power source and the source terminal of the switch circuit; and
a current comparator configured to monitor a voltage across the sense resistor to monitor a current delivered by the power source, and transmit a command to the switch circuit controller instructing the switch circuit controller to output the voltage to the gate terminal of the switch circuit to transition the switch circuit from the closed state to the open state when the voltage across the sense resistor is greater than an offset.
1 Assignment
0 Petitions
Accused Products
Abstract
Aspects of this disclosure relate to coupling and decoupling a power source of a device with circuitry within the device. For example, in aspects of this disclosure, when a short develops within the device, a switch circuit may decouple the power source from the some of the circuitry within the device. Decoupling the power source when a short develops may extent the operational time of the power source, and may reduce thermal excursion.
26 Citations
25 Claims
-
1. A medical device comprising:
-
a switch circuit comprising a source terminal, a drain terminal, and a gate terminal, wherein the source terminal is coupled to a power source; a switch circuit controller coupled directly to the drain terminal and the gate terminal of the switch circuit and configured to; monitor a voltage at the drain terminal of the switch circuit, and output a voltage to the gate terminal of the switch circuit to transition the switch circuit from a closed state to an open state when the voltage at the drain terminal of the switch circuit is less than a predetermined voltage threshold; and a switch state selector comprising; a sense resistor coupled to the power source and the source terminal of the switch circuit; and a current comparator configured to monitor a voltage across the sense resistor to monitor a current delivered by the power source, and transmit a command to the switch circuit controller instructing the switch circuit controller to output the voltage to the gate terminal of the switch circuit to transition the switch circuit from the closed state to the open state when the voltage across the sense resistor is greater than an offset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method comprising:
-
monitoring a voltage at a drain terminal of a switch circuit, within a medical device, wherein the switch circuit comprises a source terminal coupled to a power source, a gate terminal, and the drain terminal; directly outputting a voltage to the gate terminal of the switch circuit to transition the switch circuit from a closed state to an open state when the voltage at the drain terminal of the switch circuit is less than a predetermined voltage threshold; monitoring a voltage across a sense resistor coupled to the power source and the source terminal of the switch circuit to monitor a current delivered by the power source; and causing the switch circuit to transition from the closed state to the open state when the voltage across the sense resistor is greater than an offset. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A medical device comprising:
-
means for monitoring a voltage at a drain terminal of a switch circuit, wherein the switch circuit comprises a source terminal coupled to a power source, a gate terminal, and the drain terminal; means for directly outputting a voltage to the gate terminal of the switch circuit to transition the switch circuit from a closed state to an open state when the voltage at the drain terminal of the switch circuit is less than a predetermined voltage threshold; means for monitoring a voltage across a sense resistor coupled to the power source and the source terminal of the switch circuit to monitor a current delivered by the power source; and means for causing the switch circuit to transition from the closed state to the open state when the voltage across the sense resistor is greater than an offset. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
-
25. A computer-readable storage medium comprising instructions that cause one or processors, in a medical device, to:
-
monitor a voltage at a drain terminal of a switch circuit, wherein the switch circuit comprises a source terminal coupled to a power source, a gate terminal, and the drain terminal; directly output a voltage to the gate terminal of the switch circuit to transition the switch circuit from a closed state to an open state when the voltage at the drain terminal of the switch circuit is less than a predetermined voltage threshold; monitor a voltage across a sense resistor coupled to the power source and the source terminal of the switch circuit to monitor a current delivered by the power source; and cause the switch circuit to transition from the closed state to the open state when the voltage across the sense resistor is greater than an offset.
-
Specification