Patent ID: 9739823
Date: 2017-08-22
CPC Classifications: G01R

Claim:
1. A diagnostic circuit for detecting an interruption in a connection between a circuit configuration having at least one first controllable switching element, forming a load path between a first and a second load terminal, and a load connected to the first controllable switching element, said load being connected by the first controllable switching element to a supply voltage source with a first terminal for a high supply potential and a second terminal for a lower supply potential, the diagnostic circuit comprising: at least one further controllable switching element forming a further load path between a first load terminal and a second load terminal of said further controllable switching element, the further load path connected in parallel to the load path of the first controllable switching element; a control unit for controlling control inputs of the first controllable switching element and of said at least one further controllable switching element, whereby said control unit is configured for controlling the first controllable switching element and said at least one further switching element in accordance with a time-adjustable operating sequence; a reference voltage source outputting a reference voltage; and an analysis unit having a first input, a second input and an output, whereby said first input is connected, via said reference voltage source, to the first terminal of the supply voltage source to which the first controllable switching element is connected, and said second input is connected to said load terminals of the first controllable switching element and of said at least one further switching elements which are connected to the load, whereby said analysis unit is configured to indicate, at said output, whether a voltage in the load path of the first controllable switching element and/or the further load path of said at least one further controllable switching element is higher or lower than the reference voltage.