Power supply control method, current-to-voltage conversion circuit and electronic apparatus
AssigneeFujitsu Limited
InventorsShigeo Tanaka, Hidekiyo Ozawa
Life of this patent
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Abstract
A power supply control method is adapted to a current-to-voltage conversion circuit which has a transformer for converting and outputting an input power. The power supply control method stops a power supply to the transformer when an output side of the current-to-voltage conversion circuit is in a no-load state, and starts a power supply to the transformer when an external voltage is applied to the output side of the current-to-voltage conversion circuit.
Claims15
A power supply control method adapted to a current-to-voltage conversion circuit which has a transformer for converting and outputting an input power, comprising:
- stopping a power supply to the transformer when an output side of the current-to-voltage conversion circuit is in a no-load state;
- and
- starting a power supply to the transformer when an external voltage is applied to the output side of the current-to-voltage conversion circuit.
A current-to-voltage conversion circuit having an active state and a deactivated state, comprising:
- an input section to input an input power;
- a transformer to convert the input power into an output power;
- an output section to output the output power;
- a first circuit to stop a power supply to the transformer and put the current-to-voltage conversion circuit into a deactivated state when the output section is in a no-load state;
- and
- a second circuit to start a power supply to the transformer and put the current-to-voltage conversion circuit into an active state when an external voltage is applied to the output section.
An electronic apparatus connectable to a current-to-voltage conversion circuit having an output side,
- said current-to-voltage conversion circuit assuming a deactivated state when the output side is in a no-load state and assuming an active state when an external voltage is applied to the output side,
- said electronic apparatus comprising:
- a switching circuit to apply the external voltage to the output side of the current-to-voltage conversion circuit in the deactivated state.
An electronic apparatus comprising:
- a current-to-voltage conversion circuit comprising an input section to receive an input power, a transformer to convert the input power into an output power, an output section to output the output power, a first circuit to stop a power supply to the transformer and put the current-to-voltage conversion circuit into a deactivated state when the output section is in a no-load state, and a second circuit to start a power supply to the transformer and put the current-to-voltage conversion circuit into an active state when an external voltage is applied to the output section;
- and
- a control section to apply the external voltage to the output section of the current-to-voltage conversion circuit in the deactivated state.
A power supply control method adapted to a current-to-voltage conversion circuit which has a transformer for converting and outputting an input power, comprising:
- detecting a no-load state of an output side of the current-to-voltage conversion circuit;
- and
- stopping a power supply to the transformer when the output side of the current-to-voltage conversion circuit is in the no-load state.
A current-to-voltage conversion circuit having an active state and a deactivated state, comprising:
- an input section to input an input power;
- a transformer to convert the input power into an output power;
- an output section to output the output power;
- a detecting section to detect a no-load state of the output section;
- and
- a circuit to stop a power supply to the transformer and put the current-to-voltage conversion circuit into a deactivated state when the output section is in the no-load state.
Dependencies are inferred from the claim text.