CN104633861B - A kind of convertible frequency air-conditioner and its power-supplying circuit - Google Patents
A kind of convertible frequency air-conditioner and its power-supplying circuit Download PDFInfo
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- CN104633861B CN104633861B CN201510050734.5A CN201510050734A CN104633861B CN 104633861 B CN104633861 B CN 104633861B CN 201510050734 A CN201510050734 A CN 201510050734A CN 104633861 B CN104633861 B CN 104633861B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
Abstract
The invention belongs to air-conditioning power supply control technical field, there is provided a kind of convertible frequency air-conditioner and its power-supplying circuit.For the power-supplying circuit, on convertible frequency air-conditioner during electricity, by controller driving, low-tension supply control module is by low-voltage direct electricity output to circuit of power factor correction and uses electric loading, and control pre-charge module connects rectification circuit and AC power simultaneously；When the voltage of bus capacitor rises to operating voltage, controller control high voltage power supply control module substitutes pre-charge module and continues to turn on rectification circuit and AC power；And when convertible frequency air-conditioner enters holding state, controller control high voltage power supply control module disconnects the connection between rectification circuit and AC power, when the voltage of bus capacitor drops to safe voltage, controller control low-tension supply control module stops low-voltage direct electricity output to circuit of power factor correction and uses electric loading, so that power consumption of the convertible frequency air-conditioner in standby is reduced.
Description
Technical field
The invention belongs to air-conditioning power supply control technical field, more particularly to a kind of convertible frequency air-conditioner and its power-supplying circuit.
Background technology
At present, during routine use, the working time of convertible frequency air-conditioner is typically smaller than its stand-by time, and prior art exists
It is convertible frequency air-conditioner is in power-up state when convertible frequency air-conditioner is standby, so that frequency conversion can be made when user needs to use convertible frequency air-conditioner
Air-conditioning quickly opens work, but so may result in convertible frequency air-conditioner expends more electric energy in standby, in turn results in and treats
Machine power consumption is too high.
The content of the invention
It is an object of the invention to provide a kind of power-supplying circuit of convertible frequency air-conditioner, it is intended to which solving prior art makes frequency conversion
There is the too high problem of power consumption standby in air-conditioning.
The present invention is achieved in that a kind of power-supplying circuit of convertible frequency air-conditioner, and it includes rectification circuit, power factor
Alternating current is converted to high voltage direct current and passed through by correcting circuit, bus capacitor, Switching Power Supply and controller, the rectification circuit
The circuit of power factor correction exports the use electric loading into the convertible frequency air-conditioner, and the Switching Power Supply turns the alternating current
Be changed to low-voltage DC, the bus capacitor be connected to the circuit of power factor correction positive output end and negative output terminal it
Between, the controller connects the positive output end of the circuit of power factor correction by sampling resistor；
The power-supplying circuit also includes：
Pre-charge module, high voltage power supply control module and low-tension supply control module；
The input of the pre-charge module is connected to AC power altogether with the input of the high voltage power supply control module
Second end, the first end of the AC power connects the first input end of the rectification circuit, the output of the pre-charge module
End is connected to the second input of the rectification circuit, the low-tension supply control with the output end of the high voltage power supply control module altogether
The input of molding block connects the output end of the Switching Power Supply, and the output end of the low-tension supply control module connects the work(
The low tension source of the power end of rate factor correcting circuit and the use electric loading, it is the controlled end of the pre-charge module, described
The controlled end of the controlled end of high voltage power supply control module and the low-tension supply control module is connected with the controller；
On convertible frequency air-conditioner during electricity, the controller controls the low-tension supply control module that the low-voltage DC is defeated
Go out to the circuit of power factor correction and the use electric loading, and control the pre-charge module to connect the rectified current simultaneously
Road and the AC power；When the controller rises to work by the voltage that the sampling resistor detects the bus capacitor
When making voltage, the controller controls the high voltage power supply control module to substitute the pre-charge module and continues to turn on the rectification
Circuit and the AC power；
When convertible frequency air-conditioner enters holding state from the state of working on power, the controller controls the high voltage power supply control
Module disconnects the connection between the rectification circuit and the AC power, when the controller is detected by the sampling resistor
When dropping to safe voltage to the voltage of the bus capacitor, the controller controls the low-tension supply control module to stop will
The low-voltage direct electricity output is to the circuit of power factor correction and described uses electric loading；The operating voltage is more than the peace
Full voltage.
Present invention also offers a kind of convertible frequency air-conditioner including above-mentioned power-supplying circuit.
The present invention includes pre-charge module, high voltage power supply control module and low-tension supply control by being used in convertible frequency air-conditioner
The power-supplying circuit of molding block, on convertible frequency air-conditioner during electricity, low-tension supply control module is driven by low-voltage direct by controller
Electricity output is to circuit of power factor correction and uses electric loading, and control pre-charge module connects rectification circuit and alternating current simultaneously
Source；When the voltage of bus capacitor rises to operating voltage, controller control high voltage power supply control module substitutes pre-charge module
Continue to turn on rectification circuit and AC power；And when convertible frequency air-conditioner enters holding state, controller control high voltage power supply control
Module disconnects the connection between rectification circuit and AC power, when the voltage of bus capacitor drops to safe voltage, controller
Control low-tension supply control module stops low-voltage direct electricity output to circuit of power factor correction and uses electric loading, so that becoming
Power consumption of the frequency air-conditioning in standby is reduced, and solving prior art makes convertible frequency air-conditioner power consumption occur too high standby
Problem.
Brief description of the drawings
Fig. 1 is the function structure chart of the power-supplying circuit of convertible frequency air-conditioner provided in an embodiment of the present invention；
Fig. 2 is the exemplary circuit structure chart of the power-supplying circuit of convertible frequency air-conditioner provided in an embodiment of the present invention；
Fig. 3 is the waveform timing chart involved by the operation principle of the power-supplying circuit shown in Fig. 2.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present embodiments relate to convertible frequency air-conditioner and its power-supplying circuit, convertible frequency air-conditioner includes being controlled with electric loading and power supply
Circuit processed, Fig. 1 shows the modular structure of the power-supplying circuit, for convenience of description, illustrate only and the embodiment of the present invention
Related part, details are as follows：
In embodiments of the present invention, the power-supplying circuit 100 of convertible frequency air-conditioner includes rectification circuit 101, power factor school
Positive circuit 102, bus capacitor E1, Switching Power Supply 103 and controller 104.The positive output end V+ and negative output terminal of rectification circuit 101
V- connects the positive input terminal Pin and negative input end Nin of circuit of power factor correction 102 respectively, and rectification circuit 101 turns alternating current
It is changed to high voltage direct current and exports the use electric loading 200 into convertible frequency air-conditioner, power factor by circuit of power factor correction 102
The positive output end Pout and negative output terminal Nout of correcting circuit 102 are connected with the positive input terminal P and negative input of electric loading 200 respectively
End N.The first input end AC1 of Switching Power Supply 103 and the second input AC2 connect the first end and second of AC power AC respectively
Alternating current is converted to low-voltage DC by end, Switching Power Supply 103.Bus capacitor E1 is connected to circuit of power factor correction 102
Between positive output end Pout and negative output terminal Nout.Controller 104 connects circuit of power factor correction by a sampling resistor Rs
102 positive output end Pout.Discharge resistance RLAlso the positive output end Pout and negative output of circuit of power factor correction 102 are connected to
Between the Nout of end, when bus capacitor E1 is in discharge condition, can be by discharge resistance RLDischarged.Wherein, rectification circuit
101st, circuit of power factor correction 102 and Switching Power Supply 103 are common circuit, therefore repeat no more.Bus capacitor E1 is specific
Electrochemical capacitor, controller 104 also can be specifically conventional single-chip microcomputer, arm processor or other possess at mathematical logic
The Programmable Logic Controller of reason ability.With electric loading 200 be specifically convertible frequency air-conditioner include SPM (i.e. IPM modules) with
And other power circuits are in interior load circuit.
Power-supplying circuit 100 also includes：
Pre-charge module 105, high voltage power supply control module 106 and low-tension supply control module 107；
The input of pre-charge module 105 is connected to AC power AC's altogether with the input of high voltage power supply control module 106
Second end, the first end of AC power AC connects the first input end AC1 of rectification circuit 101, the output end of pre-charge module 105
With the second input that the output end of high voltage power supply control module 106 is connected to rectification circuit 101 altogether, low-tension supply control module
The output end vo ut of 107 input connecting valve power supply 103, low-tension supply control module 107 output end connection power because
The power end VCC and the low tension source VCC with electric loading of number correcting circuit 102, the controlled end of pre-charge module 105, high pressure
The controlled end of energy supply control module 106 and the controlled end of low-tension supply control module 107 are connected with controller 104.
When convertible frequency air-conditioner works on power, controller 104 controls low-tension supply control module 107 by above-mentioned low-voltage DC
Output to circuit of power factor correction 102 and use electric loading 200, and simultaneously control pre-charge module 105 connection rectification circuit 101
With AC power AC；When controller 104 rises to operating voltage by the voltage that sampling resistor Rs detects bus capacitor E1,
The control high voltage power supply of controller 104 control module 106 substitutes pre-charge module 105 and continues to turn on rectification circuit 101 and alternating current
Source AC.
Wherein, when electricity on convertible frequency air-conditioner, pre-charge module 105 connects rectification circuit 101 and AC power AC, then whole
Current circuit 101 just can convert alternating current to high voltage direct current by circuit of power factor correction 102 export to dc bus with
Bus capacitor E1 is charged.When the voltage of bus capacitor E1 rises to operating voltage, show convertible frequency air-conditioner possessed into
Enter the condition of power supply of normal operating conditions, then controller 104 can control pre-charge module 105 to disconnect rectification circuit 101 and exchange
Connection between power supply AC, switchs to control high voltage power supply control module 106 and continues to turn on rectification circuit 101 and AC power AC,
It is achieved thereby that the supply access switching from power-up state to normal operating conditions.
When convertible frequency air-conditioner enters holding state from the state of working on power, the control high voltage power supply control module of controller 104
106 disconnect the connection between rectification circuit 101 and AC power AC, when controller 104 detects bus by sampling resistor Rs
When the voltage of electric capacity E1 drops to safe voltage, the control low-tension supply of controller 104 control module 107 stops above-mentioned low-pressure direct
Stream electricity output is to circuit of power factor correction 102 and with electric loading 200.Wherein, above-mentioned operating voltage is more than safe voltage, work
Voltage and safe voltage are all pre-set and are embedded in the control program of controller 104 that operating voltage is for weighing
Whether convertible frequency air-conditioner can enter the reference voltage of normal operating conditions, and safe voltage is then for judging whether dc bus falls
The reference voltage of electricity.Because convertible frequency air-conditioner enters holding state, it is possible to stop exporting HVDC to electric loading 200
Electricity, then controller 104 just can be by controlling between the cut-out AC power AC of high voltage power supply control module 106 and rectification circuit 101
Power path, reach the purpose that cutoff high is powered, when then the voltage in bus capacitor E1 drops to safe voltage, show
Dc bus power down, just can now make low-tension supply control module 107 stop the above-mentioned low-voltage DC of output to power factor
Correcting circuit 102 and with electric loading 200, and then reach the purpose that cutoff low is powered such that it is able to effectively reduce convertible frequency air-conditioner
Power consumption in the standby state.
Specifically, as shown in Fig. 2 pre-charge module 105 includes the first circuit breaker RY1 and PTC thermistor PTC1；First
The first control contact 1 of circuit breaker RY1 is grounded, second control contact 2 the receiving for pre-charge module 105 of the first circuit breaker RY1
Control end, the switch contact 3 of the first circuit breaker RY1 is the input of pre-charge module 105, the normally opened contact 4 of the first circuit breaker RY1
The first end of connection PTC thermistor PTC1, second end of PTC thermistor PTC1 is the output end of pre-charge module 105.
High voltage power supply control module 106 is grounded for the first control contact 1 of the second circuit breaker RY2, the second circuit breaker RY2,
The second of second circuit breaker RY2 controls contact 2, switch contact 3 and normally opened contact 4 to be respectively high voltage power supply control module 106
Controlled end, input and output end.
Low-tension supply control module 107 includes：
First resistor R1, PNP type triode Q1, second resistance R2 and NPN type triode Q2；
The first end of first resistor R1 is low-tension supply control module with the common contact of the emitter stage of PNP type triode Q1
107 input, second end of first resistor R1 is connected to the first end of second resistance R2 with the base stage of PNP type triode Q1 altogether,
The output end of the current collection of PNP type triode Q1 extremely low-tension supply control module 107, the second end connection NPN of second resistance R2
The colelctor electrode of type triode Q2, the base stage of NPN type triode Q2 is the controlled end of low-tension supply control module 107, the pole of NPN type three
The grounded emitter of pipe Q2.
Specifically, controller 104 can be controlled by its preliminary filling electrical control port Y, high voltage power supply control port H, low-tension supply
Port L processed and AD sampling ports CS connect the second control contact 2, the second of the second circuit breaker RY2 of the first circuit breaker RY1 respectively
Control contact 2, the base stage of NPN type triode Q2 and sampling resistor Rs.
Below in conjunction with the waveform timing chart shown in concrete operating principle and Fig. 3 the power-supplying circuit shown in Fig. 2 is made into
One step explanation：
When convertible frequency air-conditioner works on power, the low-tension supply energy control port L of controller 104 is in power up (shown in Fig. 3
The T1 stages) in output high level control NPN type triode Q2 conducting, then NPN type triode Q2 passes through its current collection because of conducting
The base potential of PNP type triode Q1 is pulled low to ground by pole and second resistance R2, and then turns on PNP type triode Q1, then
The low-voltage direct electricity output that PNP type triode Q1 exports Switching Power Supply 103 is to circuit of power factor correction 102 and uses electric loading
200, so that circuit of power factor correction 102 and being obtained in that low-tension supply with electric loading 200.At the same time, controller 104
Preliminary filling electrical control port Y outputs the first circuit breaker RY1 adhesive coupling cocks contact 3 of high level control and normally opened contact 4, thus
Just rectification circuit 101 and AC power AC can be connected, then rectification circuit 101 carries out rectification to the alternating current that AC power AC is exported
High voltage direct current to dc bus is exported after treatment by circuit of power factor correction 102 to be charged with to bus capacitor E1,
The voltage of bus capacitor E1 characterizes DC bus-bar voltage.When controller 104 detects bus capacitor E1's by sampling resistor Rs
Voltage (the V shown in Fig. 3E1) when rising to operating voltage (V1 shown in Fig. 3), show possessed into normal with electric loading 200
The condition of working condition, is then in course of normal operation (the T2 stages shown in Fig. 3), controller 104 with electric loading 200
Preliminary filling electrical control port Y can export the connection that the first circuit breaker of low level control RY1 disconnects switch contact 3 and normally opened contact 4,
Its high voltage power supply control port H outputs simultaneously high level control the second circuit breaker RY2 adhesive coupling cocks contact 3 and normally opened contact
4, so as to rectification circuit 101 and AC power AC can be continued to turn on, it is ensured that be obtained in that required for normal work with electric loading 200
High voltage power supply.
When convertible frequency air-conditioner enters holding state from the state of working on power, in the process into holding state (shown in Fig. 3
The T3 stages) in, high voltage power supply control port H output the second circuit breakers of low level control RY2 of controller 104 disconnects switch contact
3 are disconnected with the connection of normally opened contact 4, the then connection between rectification circuit 101 and AC power AC, stop to electric loading
200 provide high voltage power supply, and the electricity of bus capacitor E1 is detected by sampling resistor Rs in the AD sampling ports CS of controller 104
Pressure (the V shown in Fig. 3E1) when dropping to safe voltage (V2 shown in Fig. 3), the low-tension supply energy control port L of controller 104 is defeated
Go out low level control NPN type triode Q2 cut-off, then PNP type triode Q1 also ends therewith, thus roof-cut resistence power supply 103 with
Circuit of power factor correction 102 and with the low-tension supply path between electric loading 200, stops to circuit of power factor correction 102
Low-tension supply is provided with electric loading 200, therefore just can be stopped to electricity consumption by under holding state (the T4 stages shown in Fig. 3)
Load 200 provides high voltage power supply and low-tension supply, and the purpose of stand-by power consumption is reduced to reach.
In sum, the embodiment of the present invention includes pre-charge module 105, high voltage power supply control by being used in convertible frequency air-conditioner
The power-supplying circuit 100 of molding block 106 and low-tension supply control module 107, on convertible frequency air-conditioner during electricity, by controller 104
Control low-tension supply control module 107 is by low-voltage direct electricity output to circuit of power factor correction and uses electric loading, and same time control
Pre-charge module processed 105 connects rectification circuit 101 and AC power AC；When the voltage of bus capacitor E1 rises to operating voltage
When, the control high voltage power supply of controller 104 controls 106 modules replacement pre-charge module 105 to continue to turn on rectification circuit 101 and exchange
Power supply AC；And when convertible frequency air-conditioner enters holding state, the control high voltage power supply of controller 104 control module 106 disconnects rectified current
Connection between road 101 and AC power AC, when the voltage of bus capacitor E1 drops to safe voltage, controller 104 is controlled
Low-tension supply control module 107 stops by low-voltage direct electricity output to circuit of power factor correction 102 and with electric loading 200, from
And power consumption of the convertible frequency air-conditioner in standby is reduced, solving prior art makes convertible frequency air-conditioner power consumption occur standby
Too high problem.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of power-supplying circuit of convertible frequency air-conditioner, it includes rectification circuit, circuit of power factor correction, bus capacitor, opens
Alternating current is converted to high voltage direct current and by the circuit of power factor correction by powered-down source and controller, the rectification circuit
Output is to the use electric loading in the convertible frequency air-conditioner, and the alternating current is converted to low-voltage DC by the Switching Power Supply, described
Bus capacitor is connected between the positive output end of the circuit of power factor correction and negative output terminal, and the controller is by sampling
Resistance connects the positive output end of the circuit of power factor correction；Characterized in that, the power-supplying circuit also includes：
Pre-charge module, high voltage power supply control module and low-tension supply control module；
The input of the pre-charge module is connected to the second of AC power altogether with the input of the high voltage power supply control module
End, the first end of the AC power connects the first input end of the rectification circuit, the output end of the pre-charge module with
The output end of the high voltage power supply control module is connected to the second input of the rectification circuit altogether, and the low-tension supply controls mould
The input of block connects the output end of the Switching Power Supply, the output end of the low-tension supply control module connect the power because
The power end of number correcting circuit and the low tension source of the use electric loading, the controlled end of the pre-charge module, the high pressure
The controlled end of the controlled end of energy supply control module and the low-tension supply control module is connected with the controller；
On convertible frequency air-conditioner during electricity, the controller control the low-tension supply control module by the low-voltage direct electricity output extremely
The circuit of power factor correction and the use electric loading, and control simultaneously the pre-charge module connect the rectification circuit with
The AC power；When the controller rises to work electricity by the voltage that the sampling resistor detects the bus capacitor
During pressure, the controller controls the pre-charge module to disconnect the connection between the rectification circuit and the AC power, institute
Stating controller controls the high voltage power supply control module to connect the rectification circuit and the AC power；
When convertible frequency air-conditioner enters holding state from the state of working on power, the controller controls the high voltage power supply control module
The connection between the rectification circuit and the AC power is disconnected, when the controller detects institute by the sampling resistor
When the voltage for stating bus capacitor drops to safe voltage, the controller controls the low-tension supply control module to stop will be described
Low-voltage direct electricity output is to the circuit of power factor correction and described uses electric loading；The operating voltage is more than the safety electricity
Pressure.
2. power-supplying circuit as claimed in claim 1, it is characterised in that the pre-charge module include the first circuit breaker and
PTC thermistor；First control contact ground of first circuit breaker, the second of first circuit breaker to control contact be institute
The controlled end of pre-charge module is stated, the switch contact of first circuit breaker is the input of the pre-charge module, described
The normally opened contact of one circuit breaker connects the first end of the PTC thermistor, and the second end of the PTC thermistor is described pre-
The output end of charging module.
3. power-supplying circuit as claimed in claim 1, it is characterised in that the high voltage power supply control module is the second power-off
Device, second circuit breaker first control contact ground, second circuit breaker second control contact, switch contact and often
Open controlled end, input and output end that contact is respectively the high voltage power supply control module.
4. power-supplying circuit as claimed in claim 1, it is characterised in that the low-tension supply control module includes：
First resistor, PNP type triode, second resistance and NPN type triode；
The first end of the first resistor is low-tension supply control mould with the common contact of the emitter stage of the PNP type triode
The input of block, the second end of the first resistor is connected to the of the second resistance altogether with the base stage of the PNP type triode
One end, the output end of the extremely described low-tension supply control module of current collection of the PNP type triode, the second of the second resistance
The colelctor electrode of the end connection NPN type triode, the base stage of the NPN type triode is receiving for the low-tension supply control module
Control end, the grounded emitter of the NPN type triode.
5. a kind of convertible frequency air-conditioner, it is characterised in that the convertible frequency air-conditioner includes the power supply as described in any one of Claims 1-4
Control circuit.
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| CN201510050734.5A CN104633861B (en) | 2015-01-31 | 2015-01-31 | A kind of convertible frequency air-conditioner and its power-supplying circuit |
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| CN201510050734.5A CN104633861B (en) | 2015-01-31 | 2015-01-31 | A kind of convertible frequency air-conditioner and its power-supplying circuit |
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| CN104633861B true CN104633861B (en) | 2017-06-30 |
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| CN106329890B (en) * | 2016-11-28 | 2019-02-12 | 安徽美芝制冷设备有限公司 | Frequency conversion refrigeration equipment and low power consumpting controling circuit for frequency conversion refrigeration equipment |
| CN111490689B (en) * | 2019-01-25 | 2021-07-27 | 广东美的白色家电技术创新中心有限公司 | Control method for reducing standby power consumption, switching power supply, equipment and storage medium |
| CN110562006B (en) * | 2019-08-30 | 2023-04-28 | 广东开利暖通空调股份有限公司 | Low voltage protection method, apparatus, computer device and storage medium |
| CN111928427A (en) * | 2020-07-30 | 2020-11-13 | 海信（山东）空调有限公司 | Air conditioner control system, air conditioner and control method thereof |
| CN112821350B (en) * | 2020-12-31 | 2023-09-19 | Tcl空调器(中山)有限公司 | Voltage abnormality protection circuit, control method and air conditioner |
| CN112984739B (en) * | 2021-04-08 | 2022-03-18 | 珠海格力电器股份有限公司 | Air conditioner control method, air conditioner control device, air conditioner and storage medium |
| CN114001439B (en) * | 2021-11-30 | 2023-04-25 | 海信（广东）空调有限公司 | Air conditioner and control device and method thereof |
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| CN202019227U (en) * | 2010-11-30 | 2011-10-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Air conditioner and power supply system thereof |
| CN203586455U (en) * | 2013-12-11 | 2014-05-07 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system |
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| CN104633861A (en) | 2015-05-20 |
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