Protective device for LC filter
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorsFumihiro Kagawa, Hiroshi Fukasaku, Kazuki Najima, Yoshiki Nagata
Life of this patent
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Abstract
A protective device protects an LC filter in a vehicle. The vehicle includes a first vehicle-mounted electric device and a second vehicle-mounted electric device. The first vehicle-mounted electric device includes a first power converter. The second vehicle-mounted electric device includes a second power converter and shares a power supply with the first vehicle-mounted electric device. The LC filter is arranged between the first power converter and the power supply. The LC filter is configured such that the resonance frequency band of the LC filter can be changed. The resonance frequency band of the LC filter is changed based on a ripple amount in a current flowing in the LC filter.
Claims8
A protective device configured to protect an LC filter in a vehicle, wherein
- the vehicle includes a first vehicle-mounted electric device and a second vehicle-mounted electric device,
- the first vehicle-mounted electric device includes a first power converter,
- the second vehicle-mounted electric device includes a second power converter and shares a power supply with the first vehicle-mounted electric device,
- the LC filter is arranged between the first power converter and the power supply,
- the protective device comprising:
- a central processing unit (CPU) configured with executable program logic, to perform:
- obtaining a ripple amount in current flowing in the LC filter;
- determining whether or not the ripple amount in the current flowing in the LC filter is more than a predetermined threshold, the predetermined threshold being based on a withstand current of a capacitor element of the LC filter;
- based upon the ripple amount being more than the predetermined threshold, changing a resonance frequency band of the LC filter,
- wherein the resonance frequency band of the LC filter is changed so that a difference between the resonance frequency band of the LC filter and a carrier frequency of the second power converter becomes greater than before the resonance frequency band of the LC filter is changed.
A vehicle-mounted electric device as a first vehicle-mounted electric device mounted on a vehicle, the first vehicle-mounted electric device comprising:
- a first power converter;
- an LC filter arranged between a power supply and the first power converter;
- and
- a protective device that protects the LC filter, wherein
- the vehicle includes a second vehicle-mounted electric device in which a second power converter is provided,
- the first vehicle-mounted electric device shares the power supply with the second vehicle-mounted electric device, and
- the protective device comprising a central processing unit (CPU) configured with executable program logic, to obtain a ripple amount in current flowing in the LC filter, to determine whether or not the ripple amount in the current flowing in the LC filter is more than a predetermined threshold, the predetermined threshold being based on a withstand current of a capacitor element of the LC filter, and, based upon the ripple amount being more than the predetermined threshold, to change a resonance frequency band of the LC filter
- wherein the resonance frequency band of the LC filter is changed so that a difference between the resonance frequency band of the LC filter and a carrier frequency of the second power converter becomes greater than before the resonance frequency band of the LC filter is changed.
Dependencies are inferred from the claim text.