US 10,374,452 B2Granted

Power saving device

AssigneeDialog Semiconductor GmbH

InventorMarinus Wilhelmus Kruiskamp

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Abstract

A circuit for controlling a power supply is disclosed. The circuit has a storage element for storing energy harvested from energy sources, a backup battery, and a comparator to compare a voltage of the storage element to a reference voltage. The circuit also contains a first switch for selectively connecting the storage element to an output. A second switch connects the backup battery to the output. A switch control circuit controls the first switch to disconnect the storage element from the output and the second switch to connect the backup battery to the output, if the voltage of the storage element is below the reference voltage. The backup battery is disconnected from the output while the voltage of the storage element is below the reference voltage. The control circuit controls the second switch to disconnect the battery from the output while the voltage of the storage element is below the reference.

Claims16

Dependent claims

A circuit for controlling a power supply, comprising

a storage element for storing energy harvested from an energy source;
a backup battery;
a first switch for selectively connecting the storage element to an output;
a second switch for selectively connecting the backup battery to the output;
and
a switch control circuit comprising a voltage monitor;
wherein the voltage monitor is configured to compare a voltage of the storage element to a reference voltage;
and
wherein the switch control circuit is configured to:
control the first switch to disconnect the storage element from the output and the second switch to connect the backup battery to the output, if the voltage of the storage element is below the reference voltage;
decide whether to disconnect the backup battery from the output while the voltage of the storage element is below the reference voltage;
and
control the second switch to disconnect the backup battery from the output while the voltage of the storage element is below the reference voltage, according to the decision, wherein the switch control circuit comprises a timer and is configured to control the second switch to disconnect the backup battery from the output if the backup battery has been connected to the output for more than a reference time duration.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/367,676Filed 2 Dec 2016
Priority: DE 10 2015 226 25021 Dec 2015
Published: US 2017/0179758 A122 Jun 2017
Granted: 6 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H02J 7/345
Parallel operation in networks using both storage and other DC sources, e.g. providing buffering: using capacitors as storage or buffering devices
H02J 7/35
Parallel operation in networks using both storage and other DC sources, e.g. providing buffering: with light sensitive cells
H02J 9/06
In which the distribution system is disconnected from the normal source and connected to a standby source: with automatic change-over , e.g. UPS…
H02J 7/63
Including safety or protection arrangements: against overdischarge

Family

US 2017/0179758 A1Pre-grant publication · published 22 Jun 2017
US 10,374,452 B2This patent

From the US filing history. Foreign family members aren’t listed.

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