Patent ID: 6992467
Filing Date: 2006-01-31
Classification: H02H,Y10S

Abstract:
1. Safety device for limiting of current and voltage of an electrical consumer connected downstream to the safety device with at least one input connector and one output connector as well as input connector and output connector of a common line wherein the safety device includes at least one voltage and current limiting device and comprising at least one protective device, a voltage limiter device referenced to the common line, a current limiter device connected to the output of the voltage limiter device as well as a protective circuit, which protective circuit is disposed upstream at the voltage and current limiting device, wherein the protective circuit includes a field effect transistor as a switching and regulating transistor, wherein the source drain leg of the field effect transistor is disposed between the input connector and the voltage and current limiting device and wherein a gate of the switching and regulating transistor is connected to the common line through a control voltage feeding resistor for feeding in a control voltage of the field effect transistor, wherein a second transistor is connected to the input connector and to the gate of the switching and regulating transistor, wherein the collector of the second transistor is connected to the gate of the switching and regulating transistor for influencing the control voltage of the switching and regulating transistor, and wherein a feedback voltage is fed back to the base of the second transistor over a feedback resistor from an output of the protective circuit, wherein a voltage sensor circuit is disposed between the base of the second transistor and the common line for voltage detection.