Overheating protection system of switching module
First Claim
1. An overheating protection system of a switching module, comprising:
- temperature detecting means for detecting the temperature of the switching module passing a current through a load;
temperature estimating means for calculating a temperature change rate of a switching device inside the switching module corresponding to a current passed through the load and calculating an estimated value of the internal temperature of the switching module on the basis of the calculated temperature change rate and the detected temperature; and
current limiting means for on the basis of the value estimated by the temperature estimating means correcting a target current value of current controlling means for controlling a current passed by the switching device.
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Accused Products
Abstract
An overheating protection system for a switching module prevents thermal breakdown of switching devices for passing currents through a load, for example an electric motor, while making it possible for the switching module to provide as much required current to the load as possible. The system comprises a temperature detector for detecting the temperature of a switching module, a temperature estimator for calculating a temperature change rate of a switching device inside the switching module corresponding to a current passed through the load and calculating an estimated value of the internal temperature of the switching module on the basis of the calculated temperature change rate and the detected temperature and a current limiter for on the basis of the estimated value correcting a target current value of a current controller controlling a current passed by the switching device.
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Citations
5 Claims
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1. An overheating protection system of a switching module, comprising:
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temperature detecting means for detecting the temperature of the switching module passing a current through a load; temperature estimating means for calculating a temperature change rate of a switching device inside the switching module corresponding to a current passed through the load and calculating an estimated value of the internal temperature of the switching module on the basis of the calculated temperature change rate and the detected temperature; and current limiting means for on the basis of the value estimated by the temperature estimating means correcting a target current value of current controlling means for controlling a current passed by the switching device. - View Dependent Claims (2)
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3. An overheating protection system of a switching module, comprising:
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temperature detecting means for detecting the temperature of the switching module for passing currents through phase coils of an electric motor; temperature estimating means for calculating temperature change rates of switching devices inside the switching module corresponding to currents passed through the phase coils of the electric motor and calculating an estimated value of the internal temperature of a switching device of each phase inside the switching module on the basis of the calculated temperature change rates and the detected temperature; and current limiting means for on the basis of the estimated temperature values calculated by the temperature estimating means correcting target current values of current controlling means for controlling currents passed through the phase coils of the electric motor. - View Dependent Claims (4, 5)
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Specification