Power circuit comprising: a power switching device having a first and a second device conduction terminal, a device control terminal and an auxiliary emitter terminal the power switching device being adapted to, when in an ON state, conduct current from said first device conduction terminal of the device to said second device conduction terminal of the device; a drive input line coupled to said device control terminal of the power switching device to control switching of the power switching device, wherein the power circuit comprises: sense circuitry coupled to said auxiliary emitter terminal and comprising at least one temperature sensitive current source coupled to at least one of said first or second device conduction terminals and to said device control terminal, the sense circuitry to provide at least one sense signal from said at least one temperature sensitive current source to the drive input line, the sense signal to indicate at least one temperature, wherein said at least one temperature sensitive current source is thermally coupled to the power switching device, said at least one temperature indicated by said at least one sense signal is of the power switching device, and wherein the sense circuitry is for sensing a temperature and an overcurrent, said sense circuitry additionally comprising: an impedance connected to said auxiliary emitter terminal and to said at least one of said first or second device conduction terminals of the power switching device; and a blocking diode coupled to block current flow from the temperature sensitive current source to the impedance, and configured to allow current flow from the auxiliary emitter terminal to the at least one temperature sensitive current source, wherein the sense signal is to indicate a temperature and current through the temperature sensitive current source, the blocking diode configured to allow current flow from the auxiliary emitter terminal to increase output current of the current source when a voltage on the impedance exceeds a threshold voltage dependent on a threshold voltage of said blocking diode. a power switching device having a first and a second device conduction terminal, a device control terminal and an auxiliary emitter terminal the power switching device being adapted to, when in an ON state, conduct current from said first device conduction terminal of the device to said second device conduction terminal of the device; a drive input line coupled to said device control terminal of the power switching device to control switching of the power switching device, sense circuitry coupled to said auxiliary emitter terminal and comprising at least one temperature sensitive current source coupled to at least one of said first or second device conduction terminals and to said device control terminal, the sense circuitry to provide at least one sense signal from said at least one temperature sensitive current source to the drive input line, the sense signal to indicate at least one temperature, wherein said at least one temperature sensitive current source is thermally coupled to the power switching device, said at least one temperature indicated by said at least one sense signal is of the power switching device, and wherein the sense circuitry is for sensing a temperature and an overcurrent, said sense circuitry additionally comprising: an impedance connected to said auxiliary emitter terminal and to said at least one of said first or second device conduction terminals of the power switching device; and a blocking diode coupled to block current flow from the temperature sensitive current source to the impedance, and configured to allow current flow from the auxiliary emitter terminal to the at least one temperature sensitive current source, wherein the sense signal is to indicate a temperature and current through the temperature sensitive current source, the blocking diode configured to allow current flow from the auxiliary emitter terminal to increase output current of the current source when a voltage on the impedance exceeds a threshold voltage dependent on a threshold voltage of said blocking diode. an impedance connected to said auxiliary emitter terminal and to said at least one of said first or second device conduction terminals of the power switching device; and a blocking diode coupled to block current flow from the temperature sensitive current source to the impedance, and configured to allow current flow from the auxiliary emitter terminal to the at least one temperature sensitive current source, wherein the sense signal is to indicate a temperature and current through the temperature sensitive current source, the blocking diode configured to allow current flow from the auxiliary emitter terminal to increase output current of the current source when a voltage on the impedance exceeds a threshold voltage dependent on a threshold voltage of said blocking diode.