APPARATUS AND SYSTEMS FOR COMMON MODE VOLTAGE-BASED AC FAULT DETECTION, VERIFICATION AND/OR IDENTIFICATION
First Claim
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1. A circuit for detecting an AC fault (ACF) caused by a module coupled to a bus of a hybrid/electric power train system, comprising:
- a common mode voltage detector circuit designed to receive a high-voltage DC input signal, and to generate a common mode AC voltage signal (VCM) biased at approximately zero volts by removing a differential mode voltage component from the high-voltage DC input signal; and
a magnitude detector coupled to the common mode voltage detector circuit and designed to measure a magnitude of the common mode AC voltage signal (VCM), determine whether a measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to a fault detection threshold voltage (VTH) and to generate an ACF detection signal when the measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to the fault detection threshold voltage (VTH).
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Abstract
Apparatus for AC fault (ACF) detection are provided. In addition, apparatus for AC fault (ACF) detection and verification are provided. In addition, apparatus for identification of a module which is the cause of an AC fault (ACF) are provided. In one implementation, one or more of these apparatus can be combined to provide a fast, simple, low cost and reliable ACF detection, verification and/or identification circuit.
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Citations
20 Claims
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1. A circuit for detecting an AC fault (ACF) caused by a module coupled to a bus of a hybrid/electric power train system, comprising:
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a common mode voltage detector circuit designed to receive a high-voltage DC input signal, and to generate a common mode AC voltage signal (VCM) biased at approximately zero volts by removing a differential mode voltage component from the high-voltage DC input signal; and a magnitude detector coupled to the common mode voltage detector circuit and designed to measure a magnitude of the common mode AC voltage signal (VCM), determine whether a measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to a fault detection threshold voltage (VTH) and to generate an ACF detection signal when the measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to the fault detection threshold voltage (VTH). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hybrid/electric power train system, comprising:
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a bus; one or more modules coupled to the bus, wherein each module has a fundamental operating frequency (fCM) associated therewith, wherein one of the modules causes an AC fault (ACF); and a circuit designed to detect an AC fault (ACF) caused by one of the modules, the circuit comprising; a common mode voltage detector circuit designed to generate a common mode AC voltage signal (VCM) by removing a differential mode voltage component from a DC input signal from the bus; a magnitude detector coupled to the common mode voltage detector circuit and designed to determine whether a measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to a threshold voltage (VTH), and to generate an AC fault (ACF) detection signal when the measured magnitude of the common mode AC voltage signal (VCM) is greater than or equal to the threshold voltage (VTH). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification