CN1165941A - Air conditioner - Google Patents
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- CN1165941A CN1165941A CN 97110599 CN97110599A CN1165941A CN 1165941 A CN1165941 A CN 1165941A CN 97110599 CN97110599 CN 97110599 CN 97110599 A CN97110599 A CN 97110599A CN 1165941 A CN1165941 A CN 1165941A
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Abstract
PROBLEM TO BE SOLVED: To effectively protect a compressor and reduce time required to restore operation of an air conditioner when supply power source voltage is low. SOLUTION: An air conditioner, comprising a compressor 1, a heat source side heat exchanger 2, a pressure reducing mechanism 3 and an application side heat exchanger 4, a voltage detecting means 14 for detecting a supply power source voltage to the compressor 1 and a control means 17 for stopping an operation of the compressor 1 when a detected voltage detected by the mans 14 is lowered to a preset operation stopping set vale or less are added to protect the compressor 1 at the time when the power source voltage is lowered and to restore the operation in a short time.
Description
The present invention relates to a kind of air conditioner, in more detail, relate to a kind of air conditioner that use in power supply spread of voltage zone that is suitable for.
Well-known up to now air conditioner is by compressor, heat source side heat exchanger, the mechanism of decompressor and utilize the side heat exchanger and constitute; when the pressure of circulating cooling agent becomes abnormality, normally give the compressor protection function that what is called makes the pressure switch action and stops the running of compressor.
Although it is stable in the supply of electric power as Japan, the place that power supply voltage less changes is unchallenged, yet, supply of electric power is abominable at the scene, when air conditioner is used in the zone that power supply voltage changes significantly, usually because the variation in voltage of compressor guarantee scope be set in rated voltage ± 10% in, so this unfavorable condition below taking place.
That is, descend as power supply voltage, then the torque of compressor reduces.Then, as become below the load torque, compressor will shut down because of being subjected to load limit.So; because the inner heat that the restriction of loading with drive motor for compressor brings; so built-in thermel protection device action; in case thermel protection device action; just need long-time (for example, 30 minutes～1 hour) up to resetting, because running of air conditioner is in halted state during this; become and can not keep room temperature, the result brings uncomfortable to the user.
Method as eliminating above-mentioned this unfavorable condition can have: (1) with other power supply do standby, (2) add that automatic tension regulator boosts to power supply voltage and (3) can with the voltage corresponding compressor etc. that designs again that descends.
, even with above-mentioned any method, also increase cost unavoidably, therefore, with cheaply and with the simple method of insurance again, and not need the measure corresponding with low-voltage of resetting time be desirable.
The present invention carries out in view of the above problems, its objective is can protect compressor reliably when power supply voltage descends, and is simultaneously not time-consuming aspect the recovery running of air conditioner.
In the 1st basic structure of the present invention, be equipped with compressor, heat source side heat exchanger, the mechanism of decompressor and utilizing in the air conditioner of side heat exchanger,
Be provided with: the voltage check device that detects the power supply voltage of supplying with above-mentioned compressor; And stop the control device that the running of above-mentioned compressor stopped with setting value when be reduced to predefined running by the detection voltage that this voltage check device detected; when power supply voltage descends, compressor is protected, accomplished to recover at short notice running simultaneously.
In the 2nd basic structure of the present invention, being equipped with compressor, heat source side heat exchanger, the mechanism of decompressor, utilizing the side heat exchanger and the load of the load reduction of above-mentioned compressor being reduced in the air conditioner of device, be equipped with: the voltage check device that detects the power supply voltage of supplying with above-mentioned compressor; And reduce with setting value the control device that makes above-mentioned load reduction device action when following when be reduced to predefined load by the detection voltage that this voltage check device detected, even when power supply voltage descends, also can accomplish compressor is remained in operation.
In the 3rd basic structure of the present invention, be equipped with compressor, heat source side heat exchanger, the mechanism of decompressor, utilizing the side heat exchanger and the load of the load reduction of above-mentioned compressor is reduced in the air conditioner of device,
Be equipped with: the voltage check device that detects the power supply voltage of supplying with above-mentioned compressor; And reduce with setting value and make when following above-mentioned load reduce device action and stop with setting value the control device that the running that makes above-mentioned compressor when following stops with setting value low running when above-mentioned detection voltage is reduced to than above-mentioned load reduction when be reduced to predefined load by the detection voltage that this voltage check device detected; thereby will be when the power supply voltage in the 1st stage is low continue the running of compressor with load reduction state, when the power supply voltage in the 2nd stage is low to the compressor recovery of protecting and turn round at short notice.
In the of the present invention the 2nd and the 3rd basic structure, with the magnetic valve that is provided with in the shunting circuit of emitting side and suction side that connects above-mentioned compressor is that above-mentioned load reduces under the occasion of device, additional shunting circuit and magnetic valve get final product in basic cryogen circuit, and as long as the open and close controlling magnetic valve, structure become simple and control also to become aspect easy be comparatively desirable.
In the 4th basic structure of the present invention, reduce in the air conditioner of device at the load that is equipped with compressor, heat source side heat exchanger, the mechanism of decompressor, utilize side heat exchanger and management above-mentioned compressor load to reduce,
Also be equipped with: stop with setting value when following when power supply voltage is reduced to predefined running, above-mentioned control circuit output is used to stop to reset of signal that above-mentioned compressor turns round uses integrated circuit; And the information of using integrated circuit resetting from this is as the optical signal communication apparatus 23 and 24 of optical signal transmission to above-mentioned control circuit; monitor power supply voltage by general resetting with integrated circuit, when power supply voltage reduces, compressor protected and recover at short notice and turn round.
Fig. 1 is the air conditioner cryogen circuit figure of relevant the present invention the 1st embodiment.
Fig. 2 is the control system for air conditioner block diagram of relevant the present invention the 1st embodiment of expression.
Fig. 3 is the flow chart of the control system for air conditioner operation principle of relevant the present invention the 1st embodiment of explanation.
Fig. 4 is the sequential chart of the control system for air conditioner operation principle of relevant the present invention the 1st embodiment of explanation.
Fig. 5 is the control system for air conditioner block diagram of relevant the present invention the 2nd embodiment of expression.
Fig. 6 is the flow chart of the control system for air conditioner operation principle of relevant the present invention the 2nd embodiment of explanation.
Below, with reference to accompanying drawing, do detailed description with regard to several preferred embodiments of the present invention.
(first embodiment)
In Fig. 1 and Fig. 2, the air conditioner of relevant the present invention the 1st embodiment is shown.
As shown in Figure 1, this air conditioner is the cold air special machine, is equipped with: compressor 1, the heat source side heat exchanger 2 that works as condenser, the capillary 3 that works as the mechanism of decompressor, utilize side heat exchanger 4 and connect storage heater 5 successively and the cryogen circuit A that constitutes with refrigerant pipeline 6 as what evaporimeter worked.Label the 7, the 8th, current divider, label the 9, the 10th, locking-valve.Above-mentioned compressor 1, heat source side heat exchanger 2, capillary 3, storage heater 5, current divider 7 and locking- valve 9 and 10 are arranged on the outside, and above-mentioned side heat exchanger 4 and the current divider 8 of utilizing then is located at the indoor.
And, emitting between side pipe road 6a and the suction side pipeline 6b of above-mentioned compressor 1, the shunting circuit 12 with the magnetic valve 11 that works as the load reduction device that compressor 1 load is reduced is set.Also have, all emit the gas refrigerants shunting for what prevent when magnetic valve 11 breakdown actions compressor 1, so be necessary to make these shunting circuit 12 diameters to diminish.
In this air conditioner, 2 li of the heat source side heat exchangers that works as condenser, the high temperature and high pressure gas refrigerant of emitting from compressor 1 cools off by outside atmosphere etc., become the liquid refrigerant of HTHP, after by decompression in the process of capillary 3, utilize 4 li of side heat exchangers because room air is captured heat and evaporation gasification what work as evaporimeter, so become low-pressure refrigerant, after this, be inhaled into compressor 1 again through storage heater 5, in by the process of utilizing side heat exchanger 4 since with the heat exchange of refrigerant, by the room air that has been cooled room temperature is descended.
And, in this air conditioner, shown in Fig. 2 and 4, set up: the running switch 13 that begins this air-conditioner operation; The voltage check device 14 that works as the voltage check device that detects the power supply voltage V that supplies with above-mentioned compressor 1; When being reduced to predefined running, the detection voltage V that is detected with this voltage check device 14 stops the low-voltage to give the alarm when following with setting value VS1 with alarm 15; The detection voltage V that detects with above-mentioned voltage check device 14 is elevated to predefined overvoltage and (for example obtains information with setting value the high voltage that VS2 gives the alarm when above with alarm 16 and from above-mentioned running switch 13 and voltage check device 14, Continuity signal and detection voltage V) carry out various calculation process, according to the control module 17 of its result to above-mentioned compressor 1, magnetic valve 11 and alarm 15 and 16 output control signals.
Above-mentioned control module 17 is the unit that constitute control device, for example, is made of microcomputer.This control module 17 has following function: the detection voltage V that is detected when above-mentioned voltage check device 14 is reduced to predefined running to be stopped with setting value VS1 when following, and output stops the control signal of above-mentioned compressor 1 running and makes the control signal of above-mentioned low-voltage with alarm 15 actions; The detection voltage V that is detected when above-mentioned voltage check device 14 rises to predefined overvoltage with setting value VS2 when above, and output makes the control signal of above-mentioned high voltage with alarm 16 actions; The detection voltage V that is detected when above-mentioned voltage check device 14 is reduced to load to be reduced with setting value VS3 (stopping with setting value VS1 taller than above-mentioned running) when following, exports to make above-mentioned magnetic valve 11 carry out the control signal of breakdown action; And the detection voltage V that is detected when above-mentioned voltage check device 14 rises to and recovers with setting value VS4 (reducing the height with setting value VS2 than above-mentioned load) when above, exports to make above-mentioned magnetic valve 11 carry out the control signal etc. of closing motion.For example, running stops with setting value VS1 to have reduced by 15% magnitude of voltage (promptly from rated voltage (220V), 187V), overvoltage is with setting value VS2 for to have risen 15% magnitude of voltage (promptly from rated voltage (220V), 253V), load reduces with setting value VS3 to having reduced by 12.5% magnitude of voltage from rated voltage (220V) (that is, 192.5V) and recover with setting value VS4 for to have reduced by 7.5% magnitude of voltage (that is, 203.5V) from rated voltage (220V).
Below, with regard to the running control of this air conditioner, do detailed description with reference to the sequential chart shown in the flow chart shown in Fig. 3 and Fig. 4.
In step S1, establish running switch 13 and be ON, then in step S2, detect voltage V, stop to compare to detecting voltage V and running with setting value VS1 at step S3 from voltage check device 14 inputs.Therein, and when judging V≤VS1 (, power supply voltage is judged as when being reduced to the running stop area), then enter step S4, as forbid compressor 1 running, give the alarm with alarm 15 with low-voltage simultaneously.
On the other hand, when being judged as V＞VS1, just enter step S5, compare with setting value VS2 with overvoltage detecting voltage V at step S3.Therein, and when being judged as V 〉=VS2 (, when power supply voltage is judged as overvoltage condition), then enter step S6, and give the alarm with alarm 16 with high voltage.At this moment, why not carrying out shutting down, is because under superpotential situation, does not protect compressor 1 also not have fault, thereby can rely on the ability of air conditioner and turn round.
Step S5 (, power supply voltage is judged as when running well the zone) when being judged as V＜VS2, then enter step S7, the alarm of alarm 15 and 16 is just removed in the running of compressor 1 at the beginning simultaneously.
As mentioned above, after compressor 1 entry into service, monitor the change that detects voltage V, compare detecting voltage V and loading to reduce at step S8, therein with setting value VS3, as be judged as V≤VS3, then judge that at step S9 whether its state continues stipulated time t1 (for example, 1 minute), when being judged as when being, then enter step S10, make magnetic valve 11 carry out breakdown action.So, the part of the gases at high pressure refrigerant of emitting from compressor 1 just becomes the suction side that is diverted to compressor 1 through shunting circuit 12, and compressor 1 is to reduce the unloading manner running of load as a result.Thereby even power supply voltage is low, the torque of compressor 1 can not become below load torque yet, does not just have the thermal protector action of working as safety device.Just, can continue the running of air conditioner, still can be keeping room temperature to a certain degree, and that the user can not feel is uncomfortable.Also having, why reduce with the state continuance stipulated time t1 below the setting value VS3 as judgment standard becoming load detecting voltage V, is the vibration for fear of the instantaneous change occasion of power supply voltage.
Even in above-mentioned unloading running, also monitor the change that detects voltage V, compare with setting value VS4 with recovery detecting voltage V at step S11, wherein, when being judged as V 〉=VS4 (, power supply voltage is judged as the occasion that rises to recovery voltage), then enter step S12, make magnetic valve 11 carry out closing motion, and make compressor 1 recover to run well.Like this, why between the magnitude of voltage of magnitude of voltage that moves the unloading running and recovery difference being set, is in order to prevent vibration.
In step S11 when judging V＜VS4, magnetic valve 11 continues as opening, yet, in a single day be judged as V≤VS1 at step S13, just judge at step S14 whether its state continues stipulated time t2 (for example, 1 minute), when being judged as when being, then enter step S15, as stop compressor 1 running, low-voltage is moved with alarm 15.Here, why also detection voltage V being become the load reduction and use the state continuance stipulated time t2 that sets value below the VS1 as judgment standard, is the vibration for fear of power supply short time voltage change conditions.Also have, t1 and t2 need not to be same time value, can suitably set big activation and prevent time of vibrating.
After this, pass through the stipulated time (for example, 3 minutes) as being judged as at step S16, then return step S3, and proceed the control under the conducting state of running switch 13.
Relation between the action of the power supply variation in voltage that is caused by above-mentioned control and running switch 13, compressor 1 magnetic valve 11 and alarm 15 is shown in the sequential of Fig. 4.
According to the above; when power supply voltage drops to the running prohibited area in the unloading running; because before thermal protector action, stop the running of compressor 1,, just can begin the running of compressor 1 more at once so power supply voltage one is got back to the normal region as safety device.Thereby the time that air conditioner is shut down shortens, and reduces because of room temperature rises allowing the user feel uncomfortable.
Also have, reduce device, except that the magnetic valve of present embodiment, also can adopt at the built-in feel trim actuator of compressor etc. as the load that reduces compressor load.
(second embodiment)
Fig. 5 expresses the structure of the control system for air conditioner of relevant the present invention the 2nd embodiment.
At this moment, as shown in Figure 5, carry out dividing potential drop and step-down from power supply (that is, AC power) 18 by divider 19 after, through rectifier 20 to resetting with integrated circuit 21 power supplies.The microcomputer 22 that control circuit as management compressor 1 running control is worked stops with setting value VS when following when power supply voltage is reduced to predefined running, and output is used to stop the signal of above-mentioned compressor running.For example, when the output signal of using integrated circuit 21 from resetting continues 10 minutes, just stop the running of compressor 1.
And, reset with the information of integrated circuit 21 above-mentioned, be transferred to above-mentioned microcomputer 22 1 sides by the optical signal communication apparatus 23,24 that works as optical signal communication apparatus, other structure is owing to omitting explanation equally with the 1st embodiment.
Below, with regard to the air-conditioner operation control of relevant present embodiment, do detailed description with reference to the flow process shown in Fig. 6.
At step S1, monitor according to the power supply voltage V that resets with integrated circuit 21; At step S2, power supply voltage V and setting voltage VS are compared, therein when being judged as V＞VS, then at step S3 signal " height " input microcomputer 22, then, return step S1 power supply voltage proceeded to monitor.
At step S2, when being judged as V≤VS, then enter step S4, signal " low " input micro computer 22,, just stop its running in order to protect compressor 1 at step S5 in case this signal continues 10 minutes.Then, at step S6, to monitoring by the power supply voltage V that causes with integrated circuit 21 that resets, at step S7, above-mentioned supply voltage is proceeded to monitor before recovering normal voltage in that power supply voltage V is judged as, judge in a single day that at step S7 power supply voltage got back to normal voltage, just enter step S8, recover the routine running control of microcomputer 22, and return step S1.
As mentioned above; in the present embodiment; monitor power supply voltage V by resetting with integrated circuit 21; when power supply voltage V is reduced to setting voltage VS when following; execution stops the running of compressor 1; thereby just can stop the running of compressor 1 before as the action of the thermal protector of safety device, and power supply voltage V one gets back to the normal region, and horse back just can begin the running of compressor 1 again.Thereby, shortened the time that air conditioner shuts down, and minimizing allows the user feel uncomfortable because of room temperature rises.And, under the situation of present embodiment, general and cheap integrated circuit is used as the power supply monitoring voltage, so do not need transformer, also help to reduce cost.
The air conditioner of present embodiment is the cooling special machine, yet the present invention also may be applicable to the heat pump type air conditioner that can cool off and warm oneself.
According to the 1st basic structure of the present invention, by detecting the power supply voltage of supplying with compressor Voltage check device, when the detection lower voltage that detects stops with establishing to predefined running When definite value is following, just stop the running of above-mentioned compressor, thereby, can be reliably low to supply voltage Compressor when lower is protected, the recovery of can turning round at short notice simultaneously, and having can be significantly The change that degree reduces because of power supply voltage causes the uncomfortable excellent results of user.
According to the 2nd basic structure of the present invention, when the supply voltage by detect supplying with compressor The detection lower voltage that voltage check device detects is to predefined load reduction setting value When following, just make above-mentioned load reduction device action, thereby, even low at power supply voltage The time, also can proceed the running of compressor, and might eliminate the change because of power supply voltage Moving and cause the uncomfortable excellent results of user.
According to the 3rd basic structure of the present invention, when the supply voltage by detect supplying with compressor The detection lower voltage that voltage check device detects is to predefined load reduction setting value When following, just make the reduction device action of the load load that reduces compressor, and when above-mentioned detection Lower voltage is to stopping with setting value when following than above-mentioned load reduction with the low running of setting value Above-mentioned compressor is quit work, thereby, when the power supply voltage drop in the 1st stage with negative The lotus down state is proceeded the running of compressor, and at the power supply voltage drop in the 2nd stage The protection of Shi Jinhang compressor and the recovery of turning round at short notice can be eliminated with the power supply electricity The change of pressing and cause that the user is uncomfortable, having simultaneously can be reliably low to the power supply electric voltage exception This excellent results that compressor when falling is protected.
According to the 4th basic structure of the present invention, monitor the power supply electricity by resetting with integrated circuit Press V, when power supply voltage V is reduced to the fortune that setting voltage VS stops compressor when following Turn to, thereby, can before the thermal protector action as safety device, stop the running of compressor, Power supply voltage V one gets back to the normal region, just can begin the running of compressor at once again. From And, have to shorten the time that air conditioner shuts down and reduce because room temperature rises and allow the user feel not Comfortable excellent results. And, since general and cheap integrated circuit as the power supply electricity The supervision of pressing is used, so do not need transformer, also helps to reduce cost.
Claims (5)
1, a kind of air conditioner is equipped with: compressor (1), heat source side heat exchanger (2), the mechanism of decompressor (3) and utilize side heat exchanger (4), it is characterized in that,
Also be equipped with: detect the voltage check device (14) of the power supply voltage of supplying with above-mentioned compressor (1) and stop the control device (17) that to make above-mentioned compressor (1) turn round and stop when following with setting value when the detection voltage that is detected by this voltage check device (14) is reduced to predefined running.
2, a kind of air conditioner is equipped with: compressor (1), heat source side heat exchanger (2), the mechanism of decompressor (3), the load reduction device (11) that utilizes side heat exchanger (4) and reduce above-mentioned compressor (1) load, it is characterized in that,
Also be equipped with: detect the voltage check device (14) of the power supply voltage of supplying with above-mentioned compressor (1) and reduce with setting value the control device (17) that above-mentioned load reduction device (11) is moved when following when the detection voltage that is detected by this voltage check device (14) is reduced to predefined load.
3, a kind of air conditioner is equipped with: compressor (1), heat source side heat exchanger (2), the mechanism of decompressor (3), the load reduction device (11) that utilizes side heat exchanger (4) and reduce above-mentioned compressor (1) load, it is characterized in that,
Also be equipped with: detect the voltage check device (14) of the power supply voltage of supplying with above-mentioned compressor (1) and reduce with setting value and make when following above-mentioned load reduce device (11) action and stop to make the out-of-work control device of above-mentioned compressor (1) (17) when following with setting value low running with setting value when above-mentioned detection voltage is reduced to than above-mentioned load reduction when the detection voltage that is detected by this voltage check device (14) is reduced to predefined load.
According to claim 2 or 3 any one described air conditioner, it is characterized in that 4, above-mentioned load reduces the magnetic valve of device (11) for being provided with in the shunting circuit of emitting side and suction side (12) that connects above-mentioned compressor (1).
5, a kind of air conditioner, this air conditioner is equipped with: compressor (1), heat source side heat exchanger (2), the mechanism of decompressor (3), the control circuit (22) that utilizes side heat exchanger (4) and management above-mentioned compressor (1) running to control, it is characterized in that,
Also be equipped with: stop with setting value being used for when following the resetting of signal that to above-mentioned control circuit (22) output stops above-mentioned compressor (1) running with integrated circuit (21) with use the next information of integrated circuit (21) from resetting as the optical signal communication apparatus (23,24) of optical signal transmission to above-mentioned control circuit (22) when power supply voltage is reduced to predefined running.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10259396 | 1996-04-24 | ||
| JP102593/96 | 1996-04-24 | ||
| JP350328/96 | 1996-12-27 | ||
| JP8350328A JPH109686A (en) | 1996-04-24 | 1996-12-27 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1165941A true CN1165941A (en) | 1997-11-26 |
Family
ID=26443280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97110599 Pending CN1165941A (en) | 1996-04-24 | 1997-04-24 | Air conditioner |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH109686A (en) |
| CN (1) | CN1165941A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440991B (en) * | 2007-06-06 | 2010-06-02 | 中国扬子集团滁州扬子空调器有限公司 | Control method of low voltage operating fixed speed air conditioner |
| CN102563995A (en) * | 2010-12-28 | 2012-07-11 | 三洋电机株式会社 | Control apparatus and refrigerating apparatus |
| CN106152432A (en) * | 2016-08-22 | 2016-11-23 | 青岛海尔空调器有限总公司 | Air-conditioner with fixed frequency subnormal voltage operation control method and control circuit |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3608111C1 (en) * | 1986-03-12 | 1987-10-01 | Bielomatik Leuze & Co | Sheeter for web materials |
| JP3596498B2 (en) * | 2001-09-05 | 2004-12-02 | ダイキン工業株式会社 | Air conditioner and air conditioner with humidification function |
| KR100544706B1 (en) * | 2003-11-07 | 2006-01-24 | 삼성전자주식회사 | Air conditioner and control method thereof |
| WO2006009141A1 (en) * | 2004-07-16 | 2006-01-26 | Daikin Industries, Ltd. | Air-conditioning apparatus |
| JP4628157B2 (en) * | 2005-03-30 | 2011-02-09 | 三菱電機株式会社 | Refrigeration cycle equipment |
| KR101232529B1 (en) * | 2010-11-25 | 2013-02-12 | 엘지전자 주식회사 | Air conditioning apparatus and control method thereof |
| WO2021038735A1 (en) * | 2019-08-28 | 2021-03-04 | 三菱電機株式会社 | Air-conditioning apparatus |
-
1996
- 1996-12-27 JP JP8350328A patent/JPH109686A/en active Pending
-
1997
- 1997-04-24 CN CN 97110599 patent/CN1165941A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440991B (en) * | 2007-06-06 | 2010-06-02 | 中国扬子集团滁州扬子空调器有限公司 | Control method of low voltage operating fixed speed air conditioner |
| CN102563995A (en) * | 2010-12-28 | 2012-07-11 | 三洋电机株式会社 | Control apparatus and refrigerating apparatus |
| CN102563995B (en) * | 2010-12-28 | 2015-09-02 | 松下健康医疗控股株式会社 | Control device, refrigerating plant |
| CN106152432A (en) * | 2016-08-22 | 2016-11-23 | 青岛海尔空调器有限总公司 | Air-conditioner with fixed frequency subnormal voltage operation control method and control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH109686A (en) | 1998-01-16 |
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