SYSTEMS AND METHODS FOR MEASURING ISOLATION RESISTANCE
First Claim
1. An energy storage system configured to output at least two voltages, comprising:
- one or more battery packs, wherein one terminal of the one or more battery packs is electrically coupled to a resistor representative of an isolation resistance of the battery system;
a semiconductor relay switch;
a plurality of resistors configured to electrically couple to the one or more battery packs via the semiconductor relay switch;
a gain field-effect transistor (FET) configured to electrically short at least one resistor of the plurality of resistors; and
a control system configured to;
send a first command to the semiconductor switch to close;
acquire a first voltage waveform;
send a second command to the semiconductor switch to open;
send a third command to the gain FET to close;
send a fourth command to the semiconductor switch to close;
acquire a second voltage waveform; and
determine the isolation resistance based on the first voltage waveform and the second voltage waveform.
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Accused Products
Abstract
An energy storage system may include battery packs, such that one terminal of the battery packs is electrically coupled to a resistor representative of an isolation resistance of the battery system. The system may include a semiconductor relay switch, a plurality of resistors configured to electrically couple to the battery packs via the semiconductor relay switch, a gain field-effect transistor (FET) configured to electrically short at least one resistor of the plurality of resistors, and a control system. The control system may send a first command to the semiconductor switch to close, acquire a first voltage waveform, send a second command to the semiconductor switch to open, send a third command to the gain FET to close, send a fourth command to the semiconductor switch to close, acquire a second voltage waveform, and determine the isolation resistance based on the first voltage waveform and the second voltage waveform.
14 Citations
22 Claims
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1. An energy storage system configured to output at least two voltages, comprising:
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one or more battery packs, wherein one terminal of the one or more battery packs is electrically coupled to a resistor representative of an isolation resistance of the battery system; a semiconductor relay switch; a plurality of resistors configured to electrically couple to the one or more battery packs via the semiconductor relay switch; a gain field-effect transistor (FET) configured to electrically short at least one resistor of the plurality of resistors; and a control system configured to; send a first command to the semiconductor switch to close; acquire a first voltage waveform; send a second command to the semiconductor switch to open; send a third command to the gain FET to close; send a fourth command to the semiconductor switch to close; acquire a second voltage waveform; and determine the isolation resistance based on the first voltage waveform and the second voltage waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory computer-readable medium comprising computer-executable instructions configured to cause a processor to:
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acquire a first voltage waveform when a plurality of resistors is electrically coupled to one or more battery packs via a semiconductor relay switch; acquire a second voltage waveform when at least one resistor of the plurality of resistors is electrically shorted via a gain field-effect transistor (FET); and determine an isolation resistance between a battery system and a chassis based on the first voltage waveform and the second voltage waveform. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An isolation measurement circuit for measuring isolation resistance, comprising:
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a semiconductor relay switch; a plurality of resistors configured to electrically couple to one or more battery packs via the semiconductor relay switch, wherein one terminal of the one or more battery packs is electrically coupled to a resistor representative of an isolation resistance between a battery system and a chassis; a gain field-effect transistor (FET) configured to electrically short at least one resistor of the plurality of resistors; one or more capacitors electrically couples to a system ground of a vehicle and the one or more battery packs; and a control system configured to; acquire a first voltage waveform when the plurality of resistors is electrically coupled to the one or more battery packs via the semiconductor relay switch; acquire a second voltage waveform when the at least one resistor of the plurality of resistors is electrically shorted via the gain field-effect transistor (FET); and determine the isolation resistance between the battery system and the chassis based on the first voltage waveform and the second voltage waveform. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification