Heating engine control circuits and non-nicotine electronic vaping devices including the same
The heating engine control circuit includes a rail converter circuit and a gate driver circuit. The rail converter circuit is configured to convert a power supply voltage into a power signal based on a vaping enable signal, the vaping enable signal being a pulse width modulated signal. The gate driver circuit includes an integrated gate driver. The integrated gate driver is configured to control application of power to a heater of the non-nicotine electronic vaping device based on the power signal, a first enable signal and a second enable signal.
1. A heating engine control circuit to control operation of a heater of a non-nicotine electronic vaping device, the heating engine control circuit comprising:
a charge pump configured to control a supply of power to a heating engine drive circuit based on a vaping shutdown signal; and
a controller configured to generate the vaping shutdown signal and a heater activation signal to control the supply of power to the heater from the heating engine drive circuit, wherein the charge pump is configured to be activated in response to the controller disabling the vaping shutdown signal, and the charge pump is configured to be deactivated in response to the controller enabling the vaping shutdown signal.
2. The heating engine control circuit of claim 1 , wherein:
enabling the vaping shutdown signal disables the supply of power to the heater; and
disabling the vaping shutdown signal enables the supply of power to the heater.
3. The heating engine control circuit of claim 1 , wherein:
the controller is configured to enable the heater activation signal in response to expiration of a time interval after disabling the vaping shutdown signal.
4. The heating engine control circuit of claim 1 , wherein:
the controller is configured to enable the heater activation signal in response to detecting vaping conditions at the non-nicotine electronic vaping device.
5. The heating engine control circuit of claim 1 , wherein:
the controller is configured to enable the vaping shutdown signal in response to a fault of the heater activation signal.
6. The heating engine control circuit of claim 1 , further comprising:
a filter configured to filter an output from the charge pump.
7. The heating engine control circuit of claim 1 , further comprising:
a first capacitor connected to the charge pump; and
a second capacitor having a first terminal connected to ground and a second terminal connected to a first node between a power source and the charge pump, the power source coupled to an input voltage pin of the charge pump via the first node.
8. The heating engine control circuit of claim 7 , wherein the second capacitor is configured to filter an input voltage to the charge pump.
9. The heating engine control circuit of claim 7 , further comprising:
a pull-up resistor connected between a positive voltage source and a shutdown pin of the charge pump, the pull-up resistor configured to prevent output of the charge pump when the vaping shutdown signal has an indeterminate state.
10. The heating engine control circuit of claim 7 , further comprising:
a first pull-down resistor connected between ground and a gate of a first transistor, the first pull-down resistor configured to cut power to the heater when the heater activation signal is in an indeterminate state.
11. The heating engine control circuit of claim 10 , further comprising:
a third capacitor having a first terminal connected to ground and a second terminal connected to a second node; and
a second pull-down resistor connected between the second node and a third node, the third node between a terminal of the first transistor and a gate of a second transistor.
12. The heating engine control circuit of claim 11 , wherein:
the first transistor is configured to control operation of the second transistor based on the heater activation signal.
13. The heating engine control circuit of claim 12 , wherein:
the first transistor is configured to transition the second transistor to an on state to enable the supply of power to the heater in response to the heater activation signal being enabled; and
the first transistor is configured to transition the second transistor to an off state to disable the supply of power to the heater in response to the heater activation signal being disabled.
14. A non-nicotine electronic vaping device, comprising:
a heater configured to heat non-nicotine pre-vapor formulation drawn from a non-nicotine reservoir; and
a heating engine control circuit to control operation of the heater, the heating engine control circuit including,
a charge pump configured to control a supply of power to a heating engine drive circuit based on a vaping shutdown signal, and
a controller configured to generate the vaping shutdown signal and a heater activation signal to control the supply of power to the heater from the heating engine drive circuit, wherein the charge pump is configured to be activated in response to the controller disabling the vaping shutdown signal, and the charge pump is configured to be deactivated in response to the controller enabling the vaping shutdown signal.
15. The non-nicotine electronic vaping device of claim 14 , wherein:
enabling the vaping shutdown signal disables the supply of power to the heater; and
disabling the vaping shutdown signal enables the supply of power to the heater.
16. The non-nicotine electronic vaping device of claim 14 , wherein the heating engine control circuit further comprises:
a first capacitor connected to the charge pump; and
a second capacitor having a first terminal connected to ground and a second terminal connected to a first node between a power source and the charge pump, the power source coupled to an input voltage pin of the charge pump via the first node.
17. A heating engine control circuit to control operation of a heater of a non-nicotine electronic vaping device, the heating engine control circuit comprising:
a charge pump configured to selectively enable and disable a vaping operation based on a vaping shutdown signal; and
a controller configured to generate the vaping shutdown signal and a heater activation signal, the heater activation signal configured to control supply of power to the heater when the vaping operation is enabled, wherein the vaping operation is enabled in response to the controller disabling the vaping shutdown signal, and the vaping operation is disabled in response to the controller enabling the vaping shutdown signal.