Patent attributes
A rechargeable handheld electrically operated smoking device is provided, including a rechargeable power source; a first charging contact connected to the power source by a MOSFET voltage-controlled switch having a source, drain, and gate terminals; an operational amplifier including a non-inverting input connected to the source terminal, an inverting input connected to the drain terminal, and an output connected to the gate terminal; and a second charging contact connected to the power source, the switch being configured to prevent current flow between the first charging contact and the power source through the switch when a voltage difference therebetween is lower than a first threshold voltage, the device being configured to amplify a voltage difference between the source and drain terminals and apply it to the gate terminal, closed loop feedback is applied to the inverting input, and a biasing resistor is connected between the inverting input and electrical ground.
