Electrical circuit for transmitting state information, in particular concerning rail rolling stock, and an electrical system incorporating such a circuit

摘要

The invention relates to an electrical circuit for transmitting the state of a parameter or of an item of equipment, said electrical circuit being designed to be connected to the terminals of a power supply storage battery and comprising: an isolated link between said electrical circuit and an output (S) for transmitting an item of state information; and a switch whose open position or whose closed position is representative of the state information and which determines whether current flows through said electrical circuit, the electrical circuit transmitting the state information from the switch to the output via the isolated link. To regulate the magnitude of the current in the switch, the electrical circuit further comprises variable voltage generator means co-operating with switching means to power component elements of the electrical circuit selectively as a function of the output voltage of said variable voltage generator means, and wherein the electrical circuit further comprises inductive filter means in series with the switch, and capacitive storage means, each of which, under steady state conditions, forming energy-storage means and energy-yielding means for storing or yielding a portion of the energy of said electrical circuit, depending on the output voltage of the variable voltage generator.