Air-conditioning apparatus including an indoor unit and an outdoor unit having its compressor driven by a three-phase AC power supply
First Claim
1. An air-conditioning apparatus, including an indoor unit and an outdoor unit having its compressor driven by a three-phase alternating-current power supply, comprising:
- means, provided at at least one of the units, for preparing a serial signal corresponding to to-be-transmitted information in synchronism with a first line voltage of the three-phase alternating-current power supply and for transmitting the serial signal to the other unit;
means, provided at at least one of the units, for receiving the serial signal sent from the corresponding unit and determining the contents of the serial signal;
means for detecting one of a second and a third line voltages of the three-phase alternating-current power supply;
means for detecting a difference between a phase angle of the detected line voltage and that of the serial signal;
means for comparing the detected difference with set values;
means for determining, in accordance with the result of comparison, whether the three-phase alternating-current power supply is in a positive-phase sequence or in a negative-phase sequence; and
means for inhibiting an operation of the compressor when the negative-phase sequence is determined by the determining means.
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Accused Products
Abstract
An air-conditioning apparatus includes a control circuit adapted to detect, from among first to third line voltages of a three-phase AC power supply, the second or third line voltage not synchronizing with a serial signal. The control circuit detects a difference between a phase angle of the detected line voltage and that of the serial signal, compares the difference with set values and determines, by that comparison, whether the three-phase AC power supply is in a positive-phase sequence or in a negative-phase sequence. The operation of a compressor is inhibited when the negative-phase sequence is determined by the control circuit.
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Citations
8 Claims
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1. An air-conditioning apparatus, including an indoor unit and an outdoor unit having its compressor driven by a three-phase alternating-current power supply, comprising:
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means, provided at at least one of the units, for preparing a serial signal corresponding to to-be-transmitted information in synchronism with a first line voltage of the three-phase alternating-current power supply and for transmitting the serial signal to the other unit; means, provided at at least one of the units, for receiving the serial signal sent from the corresponding unit and determining the contents of the serial signal; means for detecting one of a second and a third line voltages of the three-phase alternating-current power supply; means for detecting a difference between a phase angle of the detected line voltage and that of the serial signal; means for comparing the detected difference with set values; means for determining, in accordance with the result of comparison, whether the three-phase alternating-current power supply is in a positive-phase sequence or in a negative-phase sequence; and means for inhibiting an operation of the compressor when the negative-phase sequence is determined by the determining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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- Resources
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Current AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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InventorsSugiyama, Akiyoshi
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Primary Examiner(s)Tanner, Harry B.
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Application NumberUS07/636,429Time in Patent Office309 DaysField of Search62/230, 62/126, 62/129, 324/83 R, 324/107, 324/108, 324/521, 340/532, 340/658, 361/22, 361/23, 361/30, 361/31, 361/33, 361/85US Class Current62/230CPC Class CodesH02H 11/004 in case of incorrect phase ...H02H 7/09 against over-voltage; again...
