Dynamic light emitting diode voltage control for wearable devices
Methods, systems, and devices for voltage control for wireless devices are described. The described techniques may enable a wearable device to dynamically select and adjust the starting input voltage (e.g., VLED) for one or more light emitting diodes (LEDs). In particular, a wearable device may dynamically determine the starting input voltage of the LEDs based on an LED configuration to be used by the LEDs, and a threshold anode line voltage to power the LEDs. The LED configuration may include parameters or characteristics of the LEDs to perform physiological measurements. The wearable device may determine an LED configuration that may be used to collect physiological data, and may perform simulations to model the voltage of the anode line throughout a measurement interval based on the LED configuration. The wearable device may determine a VLED that may maintain a voltage of the anode line above the threshold anode line voltage.
1 . A wearable device, comprising:
one or more sensors configured to acquire physiological data associated with one or more measurement types from a user, the one or more sensors comprising one or more light-emitting components and one or more light-receiving components;
a power supply configured to provide power to the one or more sensors;
electronic circuitry configured to electrically couple the power supply with the one or more light-emitting components, the electronic circuitry comprising a power input line and an anode line, wherein the one or more light-emitting components are coupled with the anode line, and wherein an anode voltage of the anode line is based at least in part on an input voltage of the power input line; and
one or more processors communicatively coupled with the power supply and the one or more sensors, wherein the one or more processors are configured to:
identify a light-emitting configuration from a plurality of light-emitting configurations usable by the one or more light-emitting components to acquire physiological data from the user throughout a measurement interval, wherein the light-emitting configuration is based at least in part on the one or more measurement types associated with the physiological data, and wherein the light-emitting configuration comprises a drive current associated with the one or more light-emitting components, a current provided to the one or more light-emitting components during the measurement interval, a measurement pattern throughout the measurement interval, or any combination thereof;
determine a minimum anode voltage of the anode line that enables the one or more light-emitting components to acquire the physiological data throughout the measurement interval based at least in part on the light-emitting configuration;
calculate, for the light-emitting configuration, a starting input voltage of the power input line based at least in part on the minimum anode voltage;
cause the power supply to charge the anode line to at least the starting input voltage prior to the measurement interval; and
acquire the physiological data associated with the one or more measurement types from the user during the measurement interval using the one or more light-emitting components based at least in part on charging the anode line to at least the starting input voltage.
2 . The wearable device of claim 1 , wherein the one or more processors are further configured to:
identify an additional light-emitting configuration from the plurality of light-emitting configurations usable by the one or more light-emitting components to acquire physiological data from the user throughout an additional measurement interval;
determine an additional minimum anode voltage of the anode line that enables the one or more light-emitting components to acquire the physiological data throughout the additional measurement interval based at least in part on the additional light-emitting configuration;
calculate, for the additional light-emitting configuration, an additional starting input voltage of the power input line based at least in part on the additional minimum anode voltage;
cause the power supply to charge the anode line to at least the additional starting input voltage prior to the additional measurement interval; and
acquire additional physiological data from the user during the additional measurement interval using the one or more light-emitting components based at least in part on charging the anode line to at least the additional starting input voltage.
3 . The wearable device of claim 2 ,
wherein the measurement interval is associated with a first charging duration prior to the measurement interval that the anode line is charged to at least the starting input voltage, and
wherein the additional measurement interval is associated with an additional charging duration prior to the additional measurement interval that the anode line is charged to at least the additional starting input voltage, wherein the first charging duration and the additional charging duration are different based at least in part on the starting input voltage and the additional starting input voltage being different.
4 . The wearable device of claim 1 , wherein the one or more processors are further configured to:
perform one or more simulations to model the anode voltage of the anode line throughout the measurement interval based at least in part on the measurement pattern of the light-emitting configuration, wherein determining the minimum anode voltage of the anode line, calculating the starting input voltage, or both, is based at least in part on the one or more simulations.
5 . The wearable device of claim 4 , wherein the measurement pattern of the light-emitting configuration comprises one or more pulsing instances that the one or more light-emitting components emit light, and one or more settling periods that the one or more light-emitting components are inactive, wherein, to perform the one or more simulations, the one or more processors are configured to:
simulate one or more voltage decreases in the anode voltage of the anode line during the one or more pulsing instances of the measurement pattern; and
simulate one or more voltage increases in the anode voltage of the anode line during the one or more settling periods of the measurement pattern, wherein determining the minimum anode voltage of the anode line, calculating the starting input voltage, or both, is based at least in part on simulating the one or more voltage decreases, the one or more voltage increases, or both.
6 . The wearable device of claim 1 , wherein the light-emitting configuration further comprises a settling period of the one or more light-emitting components between one or more pulsing instances, a burn time of the one or more pulsing instances, one or more wavelengths of light used by the one or more light-emitting components during the measurement interval, or any combination thereof.
7 . The wearable device of claim 1 , wherein the one or more processors are further configured to:
determine a charging duration between the measurement interval and a previous measurement interval based at least in part on the starting input voltage, wherein the power supply is configured to charge the anode line to at least the starting input voltage during the charging duration.
8 . The wearable device of claim 1 , wherein the one or more light-emitting components are connected to the anode line in parallel.
9 . The wearable device of claim 1 , wherein the electronic circuitry further comprises:
one or more resistors that electrically couple the power input line and the anode line, wherein the anode voltage of the anode line is based at least in part on the input voltage of the power input line and a resistance of the one or more resistors.
10 . The wearable device of claim 1 , wherein the electronic circuitry further comprises:
one or more capacitors electrically coupled with the anode line, wherein the anode voltage of the anode line is based at least in part on the input voltage of the power input line and a capacitance of the one or more capacitors, wherein the physiological data is collected by powering the one or more light-emitting components using power stored in the one or more capacitors.
11 . The wearable device of claim 1 , wherein the one or more processors are configured to:
perform one or more physiological measurements using the one or more light-emitting components and the one or more light-receiving components; and
determine one or more parameters of the light-emitting configuration based at least in part on a signal received by the one or more light-receiving components during the one or more physiological measurements.
12 . The wearable device of claim 1 , wherein the wearable device comprises a wearable ring device.
13 . The wearable device of claim 1 , wherein the wearable device comprises a wrist-worn wearable device.
14 . A method for operating a wearable device, comprising:
identifying a light-emitting configuration from a plurality of light-emitting configurations usable by one or more light-emitting components of the wearable device to acquire physiological data from a user throughout a measurement interval, wherein the light-emitting configuration is based at least in part on one or more measurement types associated with the physiological data, and wherein the light-emitting configuration comprises a drive current associated with the one or more light-emitting components, a current provided to the one or more light-emitting components during the measurement interval, a measurement pattern throughout the measurement interval, or any combination thereof;
determining a minimum anode voltage of an anode line coupled with the one or more light-emitting components that enables the one or more light-emitting components to acquire the physiological data throughout the measurement interval based at least in part on the light-emitting configuration, wherein an anode voltage of the anode line is based at least in part on an input voltage of a power input line coupled with a power supply of the wearable device;
calculating, for the light-emitting configuration, a starting input voltage of the power input line based at least in part on the minimum anode voltage;
causing the power supply to charge the anode line to at least the minimum anode voltage prior to the measurement interval based at least in part on the starting input voltage; and
acquiring the physiological data associated with the one or more measurement types from the user during the measurement interval using the one or more light-emitting components based at least in part on charging the anode line to at least the minimum anode voltage.
15 . The method of claim 14 , further comprising:
identifying an additional light-emitting configuration from a plurality of light-emitting configurations usable by the one or more light-emitting components to acquire physiological data from the user throughout an additional measurement interval;
determining an additional minimum anode voltage of the anode line that enables the one or more light-emitting components to acquire the physiological data throughout the additional measurement interval based at least in part on the additional light-emitting configuration;
calculating, for the additional light-emitting configuration, an additional starting input voltage of the power input line based at least in part on the additional minimum anode voltage;
causing the power supply to charge the anode line to at least the additional starting input voltage prior to the additional measurement interval; and
acquiring additional physiological data from the user during the additional measurement interval using the one or more light-emitting components based at least in part on charging the anode line to at least the additional starting input voltage.
16 . The method of claim 15 ,
wherein the measurement interval is associated with a first charging duration prior to the measurement interval that the anode line is charged to at least the starting input voltage, and
wherein the additional measurement interval is associated with an additional charging duration prior to the additional measurement interval that the anode line is charged to at least the additional starting input voltage, wherein the first charging duration and the additional charging duration are different based at least in part on the starting input voltage and the additional starting input voltage being different.
17 . The method of claim 14 , further comprising:
performing one or more simulations to model the anode voltage of the anode line throughout the measurement interval based at least in part on the measurement pattern of the light-emitting configuration, wherein determining the minimum anode voltage of the anode line, calculating the starting input voltage, or both, is based at least in part on the one or more simulations.
18 . The method of claim 14 , wherein the measurement pattern of the light-emitting configuration comprises one or more pulsing instances that the one or more light-emitting components emit light, and one or more settling periods that the one or more light-emitting components are inactive, the method further comprising:
simulating one or more voltage decreases in the anode voltage of the anode line during the one or more pulsing instances of the measurement pattern; and
simulating one or more voltage increases in the anode voltage of the anode line during the one or more settling periods of the measurement pattern, wherein determining the minimum anode voltage of the anode line, calculating the starting input voltage, or both, is based at least in part on simulating the one or more voltage decreases, the one or more voltage increases, or both.
19 . The method of claim 14 , wherein the light-emitting configuration further comprises a settling period of the one or more light-emitting components between one or more pulsing instances, a burn time of the one or more pulsing instances, one or more wavelengths of light used by the one or more light-emitting components during the measurement interval, or any combination thereof.
20 . The method of claim 14 , further comprising:
determining a charging duration between the measurement interval and a previous measurement interval based at least in part on the starting input voltage, wherein the power supply is configured to charge the anode line to at least the starting input voltage during the charging duration.