Device and method for switching an electrical system into standby mode

An electronic device configured to switch a system, supplied by an electrical power supply source, into standby mode, comprising:

• a charging input configured to be coupled to a charge voltage obtained from a voltage delivered by the power supply source;
• a first input configured to be coupled to the power supply source;
• a power supply output configured to be coupled to the system;
• a storage capacitive element coupled to the charging input and configured to be charged by the charge voltage;
• a switching circuit coupled between the first input and the power supply output and configured to decouple the power supply output from the first input in response to a value of the voltage across the terminals of the storage capacitive element rising to a level that is higher than a threshold which is lower than the charge voltage;
• and
• a discharge circuit configured to discharge the storage capacitive element for a discharge period in such a manner that the value of the voltage across the terminals of the storage capacitive element falls to become lower than the threshold;
• wherein the switching circuit is further configured to re-couple the first input to the power supply output at the end of the discharge period.

An electronic circuit, comprising:

• a power supply source;
• a system configured to be supplied by the power supply source;
• and
• an electronic device configured to switch the system into standby mode, comprising:
• a charging input configured to be coupled to a charge voltage obtained from a voltage delivered by the power supply source;
• a first input configured to be coupled to the power supply source;
• a power supply output configured to be coupled to the system;
• a storage capacitive element coupled to the charging input and configured to be charged by the charge voltage;
• a switching circuit coupled between the first input and the power supply output and configured to decouple the power supply output from the first input in response to a value of the voltage across the terminals of the storage capacitive element rising to a level that is higher than a threshold which is lower than the charge voltage;
• and
• a discharge circuit configured to discharge the storage capacitive element for a discharge period in such a manner that the value of the voltage across the terminals of the storage capacitive element falls to become lower than the threshold;
• wherein the switching circuit is further configured to re-couple the first input to the power supply output at the end of the discharge period.