Semiconductor power converter and its applied apparatus
First Claim
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1. A semiconductor power converter for power conversion between an input power system and an output power system by controlling current with a power semiconductor device, comprising:
- a cooling liquid path for flow of a cooling liquid to cool a power semiconductor device which generates heat;
liquid delivery means for delivering the cooling liquid through the cooling liquid path;
electricity detecting means for detecting operating voltage and operating current of the semiconductor power converter to determine heat loss of the semiconductor power converter; and
flow control means for controlling flow rate of the cooling liquid via the liquid delivery means and providing continuous and variable control of the flow rate of the cooling liquid in response to the heat loss determined by the electricity detecting means.
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Abstract
In order to keep constant an outlet temperature of a refrigerant for cooling a semiconductor power device, continuous and variable control of flow rate of the refrigerant is performed. At the same time, a variable speed fan is continuously and variably controlled in response to a temperature control so that an inlet temperature of the refrigerant is kept constant.
45 Citations
8 Claims
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1. A semiconductor power converter for power conversion between an input power system and an output power system by controlling current with a power semiconductor device, comprising:
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a cooling liquid path for flow of a cooling liquid to cool a power semiconductor device which generates heat;
liquid delivery means for delivering the cooling liquid through the cooling liquid path;
electricity detecting means for detecting operating voltage and operating current of the semiconductor power converter to determine heat loss of the semiconductor power converter; and
flow control means for controlling flow rate of the cooling liquid via the liquid delivery means and providing continuous and variable control of the flow rate of the cooling liquid in response to the heat loss determined by the electricity detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
a cooling apparatus for cooling the emergency cooling liquid to a temperature lower than a temperature of the cooling liquid prior to cooling of the power semiconductor device.
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7. The semiconductor power converter according to claim 5, wherein the flow rate of the cooling liquid is increased by the flow control means in response to the signal of the signal generating means.
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8. An apparatus including the power semiconductor converter of claim 5, and including a DC power transmission system for connecting a plurality of AC power systems by DC lines, wherein, upon detection of a ground fault on one of the DC lines, conversion of the semiconductor power converter at a first pole side close to the ground fault is stopped and an output of the semiconductor power converter at a second pole side is increased and the emergency cooling liquid is delivered by controlling the valve means of the semiconductor power converter at the second pole side.
Specification