POWER SUPPLY CIRCUIT

摘要

A power supply circuit for electronic equipment that might be affected by overheating or by a fire, the power supply circuit including a bistable switch switchable between a first state in which the input terminal is connected to the output terminal, and a second state in which the input terminal is not connected to the output terminal, a first coil, and a second coil, the bistable switch being configured to switch to the first state when the magnetic field induced by the second coil is greater than the magnetic field induced by the first coil, and to switch to the second state when the magnetic field induced by the first coil is greater than the magnetic field induced by the second coil.

主权项

1. A power supply circuit for electronic equipment that might be affected by overheating or by a fire, the power supply circuit comprising:
an input terminal for receiving a power supply voltage (Va); and an output terminal for delivering the power supply voltage to the electronic equipment; the power supply circuit comprising: a bistable switch switchable between a first state in which the input terminal is connected to the output terminal, and a second state in which the input terminal is not connected to the output terminal; a first switch controlled by a cutoff signal that is connected between the input terminal and a series circuit comprising a thermal resistor and a first coil, said series circuit lying between said first switch and a ground terminal; and a second switch controlled by a reinitialization signal and a second coil in series with between the input terminal and the ground terminal; wherein, in the second state, the bistable switch connects the input terminal to the series circuit on its side remote from the ground terminal, and in the first state, the bistable switch does not connect the input terminal to the series circuit on its side remote from the ground terminal; the bistable switch being configured to switch to the first state when the magnetic field induced by the second coil is greater than the magnetic field induced by the first coil, and to switch to the second state when the magnetic field induced by the first coil is greater than the magnetic field induced by the second coil.