Electrical isolation monitoring
AssigneeRivian IP Holdings, LLC
InventorsAdam John Emes, Lixiang Wei
Life of this patent
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Abstract
Systems, methods, and electric vehicle chargers are provided for isolation monitoring. A system includes a high voltage bus, an adjustable gain amplifier having an input coupled to the high voltage bus and having an output, where the adjustable gain amplifier is configured to generate an amplified signal, control circuitry configured to select a gain of the adjustable gain amplifier based on a voltage of the high voltage bus, and isolation detection circuitry coupled to the output of the adjustable gain amplifier and configured to determine, based on the amplified signal, whether the high voltage bus is electrically isolated.
Claims20
A system comprising:
- a high voltage bus;
- an adjustable gain amplifier having an input coupled to the high voltage bus and having an output, wherein the adjustable gain amplifier is configured to generate an amplified signal;
- control circuitry configured to select a gain of the adjustable gain amplifier based on a voltage of the high voltage bus;
- and
- isolation detection circuitry coupled to the output of the adjustable gain amplifier and configured to determine, based on the amplified signal, whether the high voltage bus is electrically isolated.
A method comprising:
- coupling an input of an adjustable gain amplifier to a high voltage bus, wherein the adjustable gain amplifier has an output and is configured to generate an amplified signal;
- selecting, using control circuitry, a gain of the adjustable gain amplifier based on a voltage of the high voltage bus;
- and
- coupling the output of the adjustable gain amplifier to isolation detection circuitry, and determining, using the isolation detection circuitry, based on the amplified signal, whether the high voltage bus is electrically isolated.
An electric vehicle charger comprising:
- a housing comprising:
- a high voltage bus,
- an adjustable gain amplifier having an input coupled to the high voltage bus and an output, wherein the adjustable gain amplifier is configured to generate an amplified signal,
- control circuitry configured to select a gain of the adjustable gain amplifier based on a voltage of the high voltage bus, and
- isolation detection circuitry coupled to the output of the adjustable gain amplifier and configured to determine, based on the amplified signal, whether the high voltage bus is electrically isolated;
- and
- a charging cable extending from the housing, wherein the charging cable is configured to be coupled to an electric vehicle and to charge the electric vehicle in response to a determination that the high voltage bus is electrically isolated.
Dependencies are inferred from the claim text.