Method and device for predicting electrolytic capacitor defects, converter and uninterruptible power supply equipped with such a device
First Claim
1. A method for predicting defects in at least one electrolytic capacitor, the method comprising:
- measuring a ripple voltage between contact terminals of a capacitor,measuring a temperature of said capacitor,determining a value of a current flowing in the capacitor,determining by a digital filter a value of an equivalent series resistance of the capacitor, and the capacitance value of the capacitor,determining at least one item of information representative of the state of aging of the capacitor using a model for determining a theoretical equivalent series resistance of said capacitor according to the temperature of the capacitor, anddisplaying information representative of a state of aging of the capacitor by displaying information representative of the capacitance of the capacitor, and/or of information representative of at least one cause associated with the state of aging of said capacitor, according to the value of the capacitance and/or of the equivalent series resistance of the capacitor.
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Accused Products
Abstract
A method and device for predicting defects of a capacitor, the method including determining the ripple voltage (Udc), the temperature (TP), and the current (Ic) of the capacitor, determining the value of an equivalent series resistance (ESR) of the capacitor, and the capacitance value (C) of the capacitor using a digital filter, determining information representative of the state of aging of the capacitor according to the temperature of the capacitor, and displaying that information and information representative of the value of the capacitance (C) and/or information representative of a cause associated with the state of aging according to the capacitance value. The device may include a converter and an uninterruptible power supply.
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Citations
14 Claims
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1. A method for predicting defects in at least one electrolytic capacitor, the method comprising:
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measuring a ripple voltage between contact terminals of a capacitor, measuring a temperature of said capacitor, determining a value of a current flowing in the capacitor, determining by a digital filter a value of an equivalent series resistance of the capacitor, and the capacitance value of the capacitor, determining at least one item of information representative of the state of aging of the capacitor using a model for determining a theoretical equivalent series resistance of said capacitor according to the temperature of the capacitor, and displaying information representative of a state of aging of the capacitor by displaying information representative of the capacitance of the capacitor, and/or of information representative of at least one cause associated with the state of aging of said capacitor, according to the value of the capacitance and/or of the equivalent series resistance of the capacitor. - View Dependent Claims (2, 3, 4)
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5. A device for predicting defects in at least one electrolytic capacitor comprising:
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means for measuring a ripple voltage between contact terminals of a capacitor, means for measuring the temperature of a capacitor, means for determining a value of a current flowing in a capacitor, a processing unit comprising first processing means for determining a value of an equivalent series resistance of a capacitor, and second processing means for determining at least one item of information representative of a state of aging of a capacitor from a model for determining a theoretical equivalent series resistance of said capacitor according to the capacitor temperature, an output interface, connected to the processing unit, for enabling the information representative of the state of aging of a capacitor to be displayed, wherein the first processing means comprises a digital filter for determining the capacitance value of a capacitor, and the output interface is for enabling information representative of the capacitance of the capacitor and/or information representative of at least one cause associated with the state of aging of said capacitor according to the value of the capacitance and/or the equivalent series resistance value of the capacitor to be displayed. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification