Air conditioner
First Claim
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1. An air conditioner, comprising:
- a power application device connected in series to a direct-current (DC) power source;
a switch device connected in parallel with said power application device;
a capacitor charged by said DC power source via said power application device;
a voltage detector for detecting a voltage of said capacitor;
an output unit for driving a motor-driven compressor for air conditioning, said output unit receiving a power from said DC power source via said switch device;
a control unit for controlling said output unit;
a power supply connected in parallel with said capacitor, for supplying a power to said control unit, said power supply receiving a power from said DC power source; and
a voltage lowering device for, when said motor-driven compressor does not operate, setting the voltage of said capacitor to a voltage which is lower than a voltage of said DC power source and which allows said control unit to operate, said voltage lowering device being controlled by said controller.
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Abstract
In an air conditioner having a control unit receiving a power from a switching power supply, a supplied voltage for the control unit is reduced to a possible lowest voltage for the unit to operate. This arrangement provides the air conditioner with less electromagnetic wave noise of the switching power supply, with a quick check and repair, and with having a motor-driven compressor quick start.
24 Citations
3 Claims
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1. An air conditioner, comprising:
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a power application device connected in series to a direct-current (DC) power source;
a switch device connected in parallel with said power application device;
a capacitor charged by said DC power source via said power application device;
a voltage detector for detecting a voltage of said capacitor;
an output unit for driving a motor-driven compressor for air conditioning, said output unit receiving a power from said DC power source via said switch device;
a control unit for controlling said output unit;
a power supply connected in parallel with said capacitor, for supplying a power to said control unit, said power supply receiving a power from said DC power source; and
a voltage lowering device for, when said motor-driven compressor does not operate, setting the voltage of said capacitor to a voltage which is lower than a voltage of said DC power source and which allows said control unit to operate, said voltage lowering device being controlled by said controller. - View Dependent Claims (2, 3)
wherein said controller allows said power application device to function as a stabilized DC power supply and decreases the voltage of said capacitor. -
3. The air conditioner of claim 1, wherein said voltage lowering device turns on and off said power application device alternatively.
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Specification