Reduced standby current in a multi-battery wearable device
AssigneeSnap Inc.
InventorZhibin Zhang
Life of this patent
Estimating the term…
Abstract
Disclosed are embodiments to provide a multi-battery energy storage device. One embodiment comprises a first battery and a second battery, with a first circuit branch coupling a positive side of the first battery to a positive side of the second battery, a second circuit branch coupling a positive side of the first battery to a negative side of the second battery, a third circuit branch coupling the negative side of the first battery to the negative side of the second battery, and multiple switchable devices configured to control flow of current through corresponding branches. Other embodiments comprise other configurations and operations.
Claims18
A battery device, comprising:
- a first battery;
- a second battery;
- a first circuit branch coupling a positive side of the first battery to a positive side of the second battery;
- a second circuit branch coupling a positive side of the first battery to a negative side of the second battery;
- a third circuit branch coupling the negative side of the first battery to the negative side of the second battery;
- a first switchable device connected to the first circuit branch and configured to control flow of current through the first circuit branch;
- a second switchable device connected to the second circuit branch and configured to control flow of current through the second circuit branch;
- and
- a third switchable device connected to the third circuit branch and configured to control flow of current through the third circuit branch
- a power controller, the power controller configured to:
- in response to the battery device entering a first operable state, open the first switchable device, open the third switchable device, and close the second switchable device;
- determine a charge state of the first and second batteries;
- in response to the battery device entering a standby state, open the second switchable device, and in response to the charge state of the second battery exceeding the charge state of the first battery, close the third switchable device.
A method, comprising:
- performing a first transitioning operation to transition a device from an operate state to a standby state;
- in response to the first transitioning operation:
- determining a charge state of a first battery and a second battery of the device;
- opening a first circuit connecting a positive side of the first battery to a negative side of the second battery;
- determining that a charge state of the first battery is greater than a charge state of the second battery;
- in response to the charge state of the first battery being greater than the charge state of the second battery:
- closing a second circuit connecting the positive side of the first battery to a positive side of the second battery;
- and
- opening a third circuit connecting a negative side of the first battery to a negative side of the second battery.
A non-transitory computer readable medium comprising instructions that, when executed by one or more processors of a device, cause the device to perform operations comprising:
- performing a first transitioning operation to transition the device from an operate state to a standby state;
- in response to the first transitioning operation:
- determining a charge state of a first battery and a second battery of the device;
- opening a first circuit connecting a positive side of the first battery to a negative side of the second battery;
- determining that a charge state of the first battery is greater than a charge state of the second battery;
- in response to the charge state of the first battery being greater than the charge state of the second battery:
- closing a second circuit connecting the positive side of the first battery to a positive side of the second battery;
- and
- opening a third circuit connecting a negative side of the first battery to a negative side of the second battery.
Dependencies are inferred from the claim text.