Protective device for protection of an electrical circuit against reversal of polarity, method, circuit arrangement and vehicle system

摘要

The present invention relates to a protective device for protection of an electrical circuit equipped with a smoothing capacitor against reversal of polarity of the input voltage, with an input via which the protective device can be connected to a voltage supply for coupling in an input voltage, with an output via which the protective device an be connected to the electrical circuit to be protected, with a controllable switch which is arranged between an input terminal of the input and an output terminal of the output having the same polarity and which is designed to interrupt a current flow between the input terminal and the output terminal which are connected to one another, and with a control unit which is designed to control the controllable switch, when an applied input voltage with reverse polarity is detected, in such a way that the interruption of the current flow takes place with a time lag relative to a time of the application of the input voltage with reverse polarity. The present invention further relates to a corresponding method, a circuit arrangement with a protective device according to the invention and a vehicle system.

主权项

1. A protective device for protection of an electrical circuit equipped with a smoothing capacitor against reversal of polarity of the input voltage, comprising:
an input via which the protective device is connectable to a voltage supply for coupling in an input voltage; an output via which the protective device is connectable to the electrical circuit to be protected; a controllable switch which is arranged between an input terminal of the input and an output terminal of the output having the same polarity and which is designed to interrupt a current flow between the input terminal and the output terminal which are connected to one another; and a control unit which is designed to control the controllable switch, when an applied input voltage with reverse polarity is detected, in such a way that the interruption of the current flow takes place with a time lag relative to a time of the application of the input voltage with reverse polarity such that the current from the smoothing capacitor decays before the controllable switch interrupts the current flow, wherein a positive input of the smoothing capacitor is directly connected to a positive input terminal of the electrical circuit and a negative input of the smoothing capacitor is directly connected to a negative input terminal of the electrical circuit.