Vaporizer device heater control
A system includes a current source circuit; a system power input; and load switching circuitry coupling the current source circuit and the system power input to an output configured to couple to a vaporizer heating element. The current source circuit, the system power input, and the load switching circuitry form part of an integrated circuit. Related apparatus, systems, techniques, and articles are also described.
1. A system comprising:
an integrated circuit comprising:
a current source circuit;
a system power input;
load switching circuitry configured to electrically couple each of the current source circuit and the system power input to a first output to power a vaporizer heating element;
a boost converter configured to provide, to the load switching circuitry, an output voltage that is higher than an input voltage corresponding to the system power input; and
control logic configured to vary a duty cycle of a signal at the first output.
2. The system of claim 1 , wherein the integrated circuit further comprises:
a protection circuitry configured to compare an operational parameter of a vaporizer device to a predetermined condition and, in response to determining that the operational parameter satisfies the condition, output an alarm signal.
3. The system of claim 2 , wherein the operational parameter includes at least one of a voltage, a current, a temperature, a current limit, and an electrical short.
4. The system of claim 2 , wherein the predetermined condition includes a predetermined threshold, the system further including at least one register storing the predetermined threshold.
5. The system of claim 4 , wherein the protection circuitry includes a comparator circuit configured to compare the operational parameter of the vaporizer device and the predetermined threshold, the comparator circuit configured to output a signal indicative of the comparison.
6. The system of claim 2 , wherein the protection circuitry is configured to detect for heater timeout, temperature of subsystems within the vaporizer device, over voltage (OVP) protection, over current protection (OCP), under-voltage-lockout (UVLO), electrical shorts, current exceeding a limit, multi-level throttling, brown-out, and/or a heater-stop inhibit signal.
7. The system of claim 2 , wherein the protection circuitry includes a watchdog timer circuit, and/or a redundant clock source.
8. The system of claim 2 , wherein the control logic is coupled to the protection circuitry, wherein the control logic is further configured to receive the alarm signal and respond to the alarm signal by at least modifying an operation of the vaporizer device, and wherein the modifying includes disconnecting at least one circuit within the vaporizer device from a power supply, modifying a clock speed of the at least one circuit, and/or modifying a power rail voltage of the at least one circuit.
9. The system of claim 1 , further comprising:
a current monitor coupled to the first output and to the control logic, the current monitor configured to sense the current at the first output; and
a voltage monitor coupled to the control logic and to a second output to the vaporizer heating element, the voltage monitor configured to sense the voltage across the vaporizer heating element,
wherein the control logic is coupled to the current monitor and the voltage monitor, wherein the control logic is configured to receive data characterizing the sensed current at the first output and the sensed voltage across the vaporizer heating element, and wherein the control logic is further configured to adjust, based on the received data, an operation of the load switching circuitry to adjust a temperature of the vaporizer heating element.
10. The system of claim 1 , wherein the load switching circuitry is configured to electrically couple the system power input to the first output via the boost converter, and wherein the load switching circuitry is configured to electrically couple the current source circuit to the first output.
11. The system of claim 1 , further comprising:
power management unit circuitry including at least one of a low dropout regulator, a direct current rectifier, and a down-converter;
an analog to digital converter;
a light emitting diode driver; and
an input-output circuitry.
12. The system of claim 1 , further comprising:
a vaporizer device body comprising:
the integrated circuit;
a power source coupled to the integrated circuit;
a controller coupled to the integrated circuit;
memory; and
a pressure sensor.
13. The system of claim 1 , wherein the duty cycle of the signal at the output is varied based on a draw profile and/or a vapor profile, wherein the draw profile characterizes a duty cycle and a draw strength, and wherein the vapor profile characterizes the duty cycle and a vapor production.
14. The system of claim 1 , further comprising:
a multiplexer including at least one switch, the multiplexer configured to switch the vaporizer heating between a first coupling with the load switching circuitry and a second coupling with a voltage monitor.
15. The system of claim 1 , further comprising:
a multiplexer including a first input connected to the load switching circuitry, a second input connected to a voltage monitor, a third input connected to the voltage monitor, a fourth input connected to a reference node, and four outputs, at least one of the four outputs connected to the first output to the vaporizer heating element.
16. A method comprising:
powering, via a first output, a vaporizer heating element to generate an inhalable aerosol;
switching, via a load switching circuitry, between powering the vaporizer heating element via a current source circuit and a system power input, wherein the switching comprises:
electrically coupling the current source circuit to the first output; or
electrically coupling the system power input to the first output via a boost converter, wherein the boost converter is configured to provide an output voltage that is higher than an input voltage corresponding to the system power input; and
varying, via a control logic, a duty cycle of a signal at the first output,
wherein the current source circuit, the system power input, the load switching circuitry, and the control logic form at least a portion of an integrated circuit.
17. The method of claim 16 , further comprising:
comparing, by a protection circuitry, an operational parameter of a vaporizer device to a predetermined condition, the integrated circuit further comprising the protection circuitry; and
outputting an alarm signal in response to determining that the operational parameter satisfies the condition.
18. The method of claim 17 , further comprising:
receiving, by the control logic, and the alarm signal; and
in response to receiving the alarm signal, modifying an operation of the vaporizer device, the modifying including disconnecting at least one circuit within the vaporizer device from a power supply, modifying a clock speed of the at least one circuit, and/or modifying a power rail voltage of the at least one circuit.
19. The method of claim 16 , further comprising:
sensing, by a current monitor coupled to the first output and to the control logic, the current at the first output;
sensing, by a voltage monitor coupled to the control logic and to a second output to the vaporizer heating element, the voltage across the vaporizer heating element; and
adjusting, by the control logic, an operation of the load switching circuitry to adjust a temperature of the vaporizer heating element, the control logic coupled to the current monitor and the voltage monitor, the control logic configured to receive data characterizing the sensed current at the first output and the sensed voltage across the vaporizer heating element, and the control logic adjusting the operation of the load switching circuitry based on the received data.
20. The method of claim 16 , wherein the duty cycle of the signal at the output is varied based on a draw profile and/or a vapor profile, wherein the draw profile characterizes a duty cycle and a draw strength, and wherein the vapor profile characterizes the duty cycle and a vapor production.
21. A vaporizer device comprising:
a cartridge comprising:
a vaporizable material comprising nicotine; and
a heating element configured to vaporize the vaporizable material to generate an inhalable aerosol; and
a vaporizer device body comprising:
a power source; and
an integrated circuit comprising:
a current source circuit;
a system power input;
load switching circuitry configured to electrically couple each of the current source circuit and the system power input to a first output to the heating element;
a boost converter configured to provide, to the load switching circuitry, an output voltage that is higher than an input voltage corresponding to the system power input; and
control logic configured to vary a duty cycle of a signal at the first output.