Protection device and protection method
AssigneeMitsubishi Electric Corporation
InventorsTakuya MUKAI, Yoshiaki KOIZUMI
Life of this patent
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Abstract
A current path of a first transistor is connected in series to a communication line. When the electric current through the current path of the first transistor becomes equal to or greater than a set electric current, a current-limiting controller limits the electric current through the current path by controlling the first transistor to increase the resistance of the current path. When the end-to-end voltage of the current path of the first transistor becomes equal to or greater than a set voltage, a load limiter switches the first transistor off.
Claims14
A protection device for an air conditioning system, the air conditioning system including air conditioning units connected to each other by connection lines including a communication line, a power source line and a common line, the protection device comprising:
- a first transistor including a first current path connected in series with the communication line;
- and
- a current-limiting controller configured to limit an electric current flowing in the first current path by controlling the first transistor so that a resistance value of the first current path increases, when the electric current flowing in the first current path is equal to or greater than a set electric current, wherein
- the protection device is configured to prevent an excess electric current from flowing in the communication line.
2-8. (canceled)
A protection method for a protection device for an air conditioning system, the air conditioning system including air conditioning units connected to each other by connection lines including a communication line, a power source line and a common line, the protection method comprising:
- limiting an electric current flowing in a current path of a first transistor, the current path being connected in series with the communication line, by controlling the first transistor so that a resistance value of the current path increases, when the electric current flowing in the current path is equal to or greater than a set electric current, wherein
- the protection method prevents an excess electric current from flowing in the communication line.
A protection device for an air conditioning system, the air conditioning system including air conditioning units connected to each other by connection lines comprising a communication line, a power source line and a common line, the protection device comprising:
- a first transistor including a first current path connected in series with the communication line;
- and
- a current interrupt controller configured to turn off the first transistor when an end-to-end voltage of the first current path is equal to or greater than a set voltage, wherein
- the protection device is configured to prevent an excess electric current from flowing in the communication line.
A protection method for a protection device for an air conditioning system, the air conditioning system including air conditioning units connected to each other by connection lines including a communication line, a power source line and a common line, the protection method comprising:
- interrupting an electric current flowing in a current path of a first transistor by causing the first transistor to turn off, when an end-to-end voltage of the current path is equal to or greater than a set voltage, wherein
- the protection method prevents an excess electric current from flowing in the communication line.
Dependencies are inferred from the claim text.