ELECTRONIC VAPOR PROVISION DEVICE WITH VARIABLE POWER SUPPLY

1 . An electronic vapor provision system comprising:

a vaporizer for generating vapor for inhalation by a user of the electronic vapor provision system;

an electrical power supply for supplying power to the vaporizer;

a user input unit for detecting a manual user actuation; and

a control unit configured to control, from an available power level range, a level of power supplied from the electrical power supply to the vaporizer in proportion to a level of manual user actuation detected by the user input unit during vapor generation, such that an increase in the level of manual user actuation gives an increased level of power and a decrease in the level of manual user actuation gives a decreased level of power and such that the level of power is delivered according to the level of manual user actuation at a time of actuation.

2 . The electronic vapor provision system according to claim 1 , wherein the manual user actuation comprises pressing, and the user input unit comprises a mechanical button or a pressure-sensitive button.

3 . The electronic vapor provision system according to claim 1 , wherein the manual user actuation comprises touching, and the user input unit comprises a touch sensitive interface.

4 . The electronic vapor provision system according to claim 3 , wherein the touch sensitive interface is formatted as a linear strip, a curved strip, a substantially flat ring, or a strip extending partly or substantially around a perimeter of the electronic vapor provision system.

5 . The electronic vapor provision system according to claim 3 , wherein the level of power is selected from the available power level range according to a location of the manual user actuation on the touch sensitive interface.

6 . The electronic vapor provision system according to claim 3 , wherein the user input unit is configured to:

detect a first instance of manual user actuation at a first location on the touch sensitive interface to cause supply of power at a first level of power; and

subsequently detect a deviation of the manual user actuation from the first location to cause supply of power at a level proportional to a displacement of a location of the latter manual user actuation from the first location.

7 . The electronic vapor provision system according to claim 1 , wherein the manual user actuation comprises sliding, and the user input unit comprises a sliding switch.

8 . The electronic vapor provision system according to claim 7 , wherein the sliding switch comprises a biasing element configured to bias a position of the sliding switch towards a position corresponding to a zero level of power supply.

9 . The electronic vapor provision system according to claim 2 , wherein the electronic vapor provision system further comprises a display configured to present to the user an indication of the level of power supplied in proportion to a current level of manual user actuation of the user input unit.

10 . The electronic vapor provision system according to claim 1 , wherein the level of power is supplied in proportion to the level of manual user actuation according to a monotonically increasing function.

11 . The electronic vapor provision system according to claim 10 , wherein the monotonically increasing function comprises one of a linear function, a quadratic function, a polynomial function, a logarithmic function, or an exponential function.

12 . The electronic vapor provision system according to claim 1 , wherein the available power level range has a minimum value and a maximum value which are adjustable by the user.

13 . The electronic vapor provision system according to claim 1 , wherein the control unit is further configured to prevent power being supplied from the electrical power supply to the vaporizer when the level of manual user actuation detected by the user input unit is below a threshold value.

14 . The electronic vapor provision system according to claim 1 , wherein the available power level range comprises a continuous range from within which any level can be supplied in response to a corresponding manual user actuation.

15 . The electronic vapor provision system according to claim 1 , wherein the available power level ranges comprises a plurality of discrete stepped levels, each of which can be supplied in response to a corresponding manual user actuation.

16 . The electronic vapor provision system according to claim 1 , further comprising an activation unit configured to detect an input and in response initiate the supply of power to the vaporizer prior to control of the level of power by the control unit.

17 . The electronic vapor provision system according to claim 16 , wherein the activation unit is configured to detect a manual input.

18 . The electronic vapor provision system according to claim 16 , wherein the activation unit is configured to detect a user inhalation.

19 . The electronic vapor provision system according to claim 1 , wherein the vaporizer is configured to generate vapor from a liquid.