US 12,403,783 B2Granted

Charging system and method of using same

AssigneeHillcrest Energy Technologies Ltd.

InventorsAri Berger, Harald Hengstenberger, Jalal Amini

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Abstract

A charging system and a method of operating the same are provided. The charging system includes an electric machine which may be a wound or un-wound rotor type or a doubly fed induction motor (DFIM). A control system is coupled to the electric machine and a battery system. In the case of a wound rotor, the control system is coupled to stator windings and a rotor winding for controlling excitation of the stator windings and the rotor winding. The charging system is AC and DC compatible. In the case of an AC power source, the control system injects excitation into a rotor winding to induce a desired voltage in the stator, if the power supply voltage of the power supply is greater or smaller than the voltage of the battery system. Other modes of operation allowing for safe charging and discharging of a battery system are also described herein.

Claims26

Dependent claims

A method of operating a charging system, the charging system comprising:

(i) an electric machine comprising at least three stator windings and at least one rotor winding;
and (ii) a control system comprising a converter coupled to the at least three stator windings and the at least one rotor winding for controlling excitation of each of the at least three stator windings and the at least one rotor winding;
the method comprising:
(a) Operating in at least one of a charging mode or a discharging mode;
and
(b) determining if a type of a power source is DC or AC;
and
(i) upon determining that the type of the power source is DC, then performing one of the following steps:
(A) bypassing the electric machine to charge a battery system from the power source, upon finding the power supply voltage Vs of the power supply is within a voltage operating range of the battery system;
(B) using the stator windings as inductors wherein the converter acts as DC/DC in buck or boost mode, in said discharging or charging mode, respectively;
(C) protecting the battery system upon finding that Vs is greater than an upper limit of the voltage operating range;
and
(ii) upon determining that the type of the power source is AC, then performing one of the following steps:
(A) injecting excitation into the at least one rotor winding to induce a voltage into the at least one of the stator windings with 180 degree phase shift to the voltage of the power source, upon finding the power supply voltage Vs of the power supply is greater than the voltage of the battery system;
(B) terminating the excitation into one of the at least one rotor winding, upon finding the power supply voltage Vs of the power supply is not significantly lower than the voltage of the battery system;
(C) injecting excitation into the at least one rotor winding to induce a voltage into the at least one of the stator windings in-phase with the voltage of the power source, upon finding the power supply voltage Vs of the power supply is smaller than an acceptable voltage of the battery system.

13 more elements

A charging system comprising:

(a) an electric machine having at least three stator windings and at least one rotor winding;
and (b) a control system coupled to the at least three stator windings and the at least one rotor winding for controlling excitation of each of the at least three stator windings and the at least one rotor winding;
wherein:
(a) the charging system is configured to operate in at least one of a charging mode or a discharging mode;
and
(b) the control system is configured to determine whether a type of a power source is AC or DC;
and
(c) the charging system is configured to perform any one of the following steps:
(i) if the power source is DC, then (A) charge a battery system from the power source, upon finding the power supply voltage Vs of the power supply is within a voltage operating range of the battery system, or (B) use the electric machine's windings as inductors and the converter acts as DC/DC in buck or boost mode, in discharging or charging mode, respectively (C) protect the battery system upon finding that Vs is greater than an upper limit of the voltage operating range;
and
(ii) if the power source is AC, then:
(A) inject excitation into the at least one rotor winding to induce a voltage in the at least one of the stator windings with 180 degree phase shift to the voltage of the power source, upon finding the power supply voltage Vs of the power supply is greater than the voltage of the battery system;
(B) terminate the excitation into one of the at least one rotor winding, upon finding the power supply voltage Vs of the power supply is not significantly lower than the voltage of the battery system;
or (C) inject excitation into the at least one rotor winding to induce a voltage into the at least one of the stator windings in-phase with the voltage of the power source, upon finding the power supply voltage Vs of the power supply is smaller than an acceptable voltage of the battery system.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/564,040Filed 26 May 2022 · us provisional application
Priority: 26 May 2021
Published: US 2024/0253490 A11 Aug 2024
Granted: 2 Sep 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

B60L 53/20
Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of…:…
H02M 7/5395
With automatic control of output wave form or frequency: by pulse-width modulation
B60L 3/0046
Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train: relating to electric energy…
B60L 53/11
Characterised by the energy transfer between the charging station and the vehicle: dC charging controlled by the charging station, e.g. mode 4