Device for obtaining electric energy and energy generator comprising such a device
AssigneeWürth Elektronik eiSos GmbH & Co. KG
InventorsMahmoud Shousha, Martin Haug
Life of this patent
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Abstract
A device for harvesting electrical energy includes a rectifier and a control device. The rectifier includes a first charging circuit for harvesting energy from a positive voltage of an energy harvester, and a second charging circuit for harvesting energy from a negative voltage of the energy harvester. The charging circuits include a common coil and a common electronic switch. Furthermore, each of the charging circuits includes a capacitor and a blocking element. Because the charging circuits use the coil jointly, the device is designed in a simple and compact manner. In addition, the energy harvesting is efficient, due to the one-stage AC-DC conversion and due to a maximum power point tracking function of the control device.
Claims24
A device for harvesting electrical energy, comprising
- a rectifier comprising
- a first input terminal and a second input terminal for connecting to an energy harvester,
- a first output terminal and a second output terminal for providing an output voltage,
- a first charging circuit for harvesting energy from a positive voltage of the energy harvester which is applied to the input terminals, comprising
- an electronic switch, wherein the electronic switch comprises a series circuit which is made up of a first electronic switching element and a second electronic switching element,
- a coil,
- a first capacitor, and
- a first blocking element,
- a second charging circuit for harvesting energy from a negative voltage of the energy harvester which is applied to the input terminals, comprising
- the electronic switch,
- the coil,
- a second capacitor, and
- a second blocking element,
- a control device for actuating the electronic switch, wherein the control device comprises at least one charge pump,
- wherein one of the at least one charge pump is connected to one of the output terminals and a node between the first and second series-connected electronic switching elements of the electronic switch.
An energy generator comprising
- a device for harvesting electrical energy, comprising
- a rectifier comprising
- a first input terminal and a second input terminal for connecting to an energy harvester,
- a first output terminal and a second output terminal for providing an output voltage,
- a first charging circuit for harvesting energy from a positive voltage of the energy harvester which is applied to the input terminals, comprising
- an electronic switch, wherein the electronic switch comprises a series circuit which is made up of a first electronic switching element and a second electronic switching element,
- a coil,
- a first capacitor, and
- a first blocking element,
- a second charging circuit for harvesting energy from a negative voltage of the energy harvester which is applied to the input terminals, comprising
- the electronic switch,
- the coil,
- a second capacitor, and
- a second blocking element,
- a control device for actuating the electronic switch, wherein the control device comprises at least one charge pump and wherein one of the at least one charge pump is connected to one of the output terminals and a node between the two series-connected electronic switching elements of the electronic switch, and
- an energy harvester which is connected to the input terminals for providing an AC voltage.
A device for harvesting electrical energy, the device comprising:
- a rectifier comprising
- a first input terminal and a second input terminal for connecting to an energy harvester,
- a first output terminal and a second output terminal for providing an output voltage,
- a first charging circuit for harvesting energy from a positive voltage of the energy harvester which is applied to the input terminals, comprising
- an electronic switch, wherein the electronic switch comprises a series circuit which is made up of a first electronic switching element and a second electronic switching element,
- a coil,
- a first capacitor, and
- a first blocking element,
- a second charging circuit for harvesting energy from a negative voltage of the energy harvester which is applied to the input terminals, comprising
- the electronic switch,
- the coil,
- a second capacitor, and
- a second blocking element,
- a control device for actuating the electronic switch, the control device comprising a control circuit for generating control signals, and a supply circuit for providing a supply voltage for the control circuit, the supply circuit comprising an ohmic resistor connected in parallel with the first capacitor.
Dependencies are inferred from the claim text.