Patent ID: 7952385
Filing Date: 2011-05-31
Classification: H02H,H02M

Abstract:
1. An apparatus comprising: a metal-oxide semiconductor field-effect transistor (MOSFET) having an input terminal directly or indirectly electrically coupled to a direct current input voltage; a transistor electrically coupled to the MOSFET and configured to cause an impedance of the MOSFET to increase in response to a sensed voltage exceeding a threshold voltage, the sensed voltage to increase in response to a rapid increase in input current, wherein the threshold voltage is a low voltage relative to the direct current input voltage; a component electrically coupled to the transistor, and configured to have a voltage drop that varies as a function of temperature; wherein the sensed voltage comprises the voltage drop of the component and a voltage drop over a resistive element, the voltage drop of the resistive element to be a function of a current of the direct current input voltage.