CN102287891B - Direct current convertible frequency air conditioner and control method thereof - Google Patents
Direct current convertible frequency air conditioner and control method thereof Download PDFInfo
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- CN102287891B CN102287891B CN 201110162844 CN201110162844A CN102287891B CN 102287891 B CN102287891 B CN 102287891B CN 201110162844 CN201110162844 CN 201110162844 CN 201110162844 A CN201110162844 A CN 201110162844A CN 102287891 B CN102287891 B CN 102287891B
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Abstract
The invention relates to a direct current convertible frequency air conditioner and a control method thereof. The direct current convertible frequency air conditioner comprises a power supply inverter module (IPM), and is characterized in that: the pulse width modulation (PWM) control signal of the power supply inverter module comprises more than two types of carrier frequencies, and the carrier frequencies correspond to the working mode of the direct current convertible frequency air conditioner. During operation, the method for operating the direct current convertible frequency air conditioner comprises the following steps of: 1, determining a corresponding carrier frequency in advance according to different working modes for running the direct current convertible frequency air conditioner; 2, calculating corresponding control parameters of a compressor according to the carrier frequency which is determined after selecting the working mode; 3, storing the control parameters of the compressor in corresponding positions of an outdoor storage; and 4, starting the air conditioner by a user to determine the different working modes for running the direct current convertible frequency air conditioner. The invention not only can solve the problem of heating of the power supply inverter module which runs at a high frequency in a high-temperature environment, but also solves the problem of instability of the frequency conversion compressor which runs at an ultrahigh frequency in a heating mode, so the comfort of the convertible frequency air conditioner is greatly improved.
Description
Technical field
The present invention relates to a kind of DC frequency converting air-conditioner, particularly a kind of DC frequency converting air-conditioner and control method thereof.
Background technology
Existing DC frequency-changing cold-warm type air-conditioning, can not take into account the high refrigerating capacity demand of high temperature under the refrigeration mode and the low temperature high heating capacity demand under the heating mode simultaneously, wherein very one of important reasons is that the high temperature refrigerating capacity of convertible frequency air-conditioner is subject to the core devices-power inverter module in the control assembly of convertible frequency air-conditioner, the IPM module is called for short in the back, heating is serious and can not the high frequency running, and low-temperature heating capacity is subject to control assembly and can not allows the running of compressor hyperfrequency under the heating mode.
Heating problem when solution IPM module is worked under the hot environment of refrigeration mode, normally adopt to strengthen radiator area, adjust the position of radiator in the blower fan air channel etc., but because be subjected to the restriction of cost and off-premises station sheet metal structural, sacrifice the processing of compromising of high temperature refrigerating capacity to reduce frequency mostly at last.
Solve the little problem of low-temperature heating capacity under the convertible frequency air-conditioner heating mode, normally adopt indoor and power up measure such as auxilliary thermic devices, but problem such as there is potential safety hazard in these measures, the power supply service efficiency is low and cost of manufacture is higher.
The controller of present DC frequency converting air-conditioner mainly consists of the following components: remote controller+indoor controller+outdoor controller.Wherein, remote controller mainly is made up of the single-chip microprocessor MCU+device that transmits, and indoor controller mainly is made up of peripheral circuits such as power circuit+single-chip microprocessor MCU+parameter storage+communication, signal samplings; Outdoor controller mainly is made up of peripheral circuits such as power circuit+main control chip DSP+ parameter storage+power inverter module+communication, signal samplings.
At present, the compressor control technology of DC frequency converting air-conditioner mainly contains based on the vector control technology of field orientation control FOC (Field Orient Control) principle and directly changes the technology apart from control DTC (Direct Torque Control), wherein again to take as the leading factor based on the vector control technology of FOC algorithm.
The maximum characteristics of DC frequency converting air-conditioner are exactly that the running frequency of compressor can change, its basic functional principle is that outdoor controller is rectified into DC voltage with AC-input voltage, then by outdoor main control chip DSP to power inverter module input space vector PWM (be called for short SVPWM) control signal, the full name of SVPWM is space vector pulse width modulation, the three-phase alternating current that DC voltage is reverse into changeable frequency drives the permagnetic synchronous motor of compressor, thereby the motor running frequency that realizes the compressor the inside is variable.
A very important parameters is arranged in the SVPWM, be i.e. in the cycle of pwm signal, also claim carrier frequency.At present the reference carrier frequency that uses of the controller in the industry is generally between 4KHz～10KHz, but a kind of carrier frequency has all only been used in each controller the inside.
Actual loading situation of change during in conjunction with the compressor operating of convertible frequency air-conditioner, the carrier frequency of SVPWM generally equal 10～20 times the maximum electric frequency of compressor electric motor, and we get 16 times usually.Giving an example, is the compressor of 3 pairs of utmost points if adopt motor, maximum requires running frequency 160HZ, and the carrier frequency of IPM module should be 16 * 3 * 160=7680HZ so.The carrier frequency of IPM module is more high, and the switching loss of IGBT is more big, and the heating of IPM module is more serious.
Summary of the invention
Purpose of the present invention aim to provide a kind of simple and reasonable, flexible operation, cost of manufacture low, satisfy high temperature high refrigerating capacity demand and the low temperature high heating capacity demand under heating mode, applied widely DC frequency converting air-conditioner and control method thereof of cold-warm type DC frequency converting air-conditioner under refrigeration or dehumidifier pattern simultaneously, to overcome weak point of the prior art.
A kind of DC frequency converting air-conditioner by this purpose design comprises power inverter module I PM, and the carrier frequency that it is characterized in that the pwm control signal of power inverter module is more than two kinds, and carrier frequency is corresponding with the mode of operation of DC frequency converting air-conditioner.
A kind of control method of DC frequency converting air-conditioner is characterized in that may further comprise the steps:
The mode of operation of described DC frequency converting air-conditioner comprises refrigeration mode, dehumidifier pattern and heating mode, wherein, and the corresponding first carrier frequency of refrigeration mode and dehumidifier pattern, corresponding second carrier frequency of heating mode.
The scope of described first carrier frequency is at 2KHz～6KHz, and the scope of second carrier frequency is at 6KHz～10KHz.
The mode of operation of described DC frequency converting air-conditioner also comprises the ultralow frequency operational mode, corresponding the 3rd carrier frequency of ultralow frequency operational mode.
For satisfy simultaneously the cold-warm type DC frequency converting air-conditioner the refrigeration or the dehumidifier pattern under the high refrigerating capacity demand of high temperature and the low temperature high heating capacity demand under heating mode, the present invention passes through at the operation modes of inverter air conditioner difference, and implement different carrier frequencies for the power inverter module, both can solve the power inverter module heating problem in high-frequency when running under hot environment, can solve frequency-changeable compressor under the heating mode again in the problem of ultra-high frequency fluctuation of service, improve the convertible frequency air-conditioner comfortableness greatly.
That the present invention has is simple and reasonable, flexible operation, cost of manufacture are low, satisfy simultaneously the cold-warm type DC frequency converting air-conditioner under refrigeration or dehumidifier pattern the high refrigerating capacity demand of high temperature and low temperature high heating capacity demand, the advantage of wide range of application under heating mode.
Description of drawings
Fig. 1 is the control block diagram of one embodiment of the invention.
Fig. 2 is the circuit connection diagram of outdoor controller.
Fig. 3 is the schematic diagram of the inside main devices of IPM module.
Among the figure: 1 is remote controller or control panel, and 2 is indoor controller, and 3 is outdoor controller, 4 is compressor, and 5 are the input of civil power alternating current, and 6 is rectifying device, 7 is power factor corrector, 8 is electrochemical capacitor, and 9 is the main control chip of outdoor controller, and 10 is the power inverter module, 11 is current sampling resistor, 12 is outdoor memory, and 13 is the driving of IGBT device for power switching, and 14 is the IGBT device for power switching.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Referring to Fig. 1, the remote controller 1 of DC frequency converting air-conditioner or the control panel on the indoor set, information such as main operational mode with user's setting, design temperature, wind speed setting are by the infrared ray media or be directly passed to indoor controller 2.
The indoor controller 2 of DC frequency converting air-conditioner, mainly act as and receive the control information that comes from the control panel on remote controller 1 or the indoor set, control room inner blower, stepper motor even load, and and outdoor controller 3 carry out the both-way communication exchange message, computing compressor target frequency etc.
The outdoor controller 3 of DC frequency converting air-conditioner, main effect is to carry out two way communication exchange information with indoor controller 2, control compressor operating frequency.
The compressor 4 of DC frequency converting air-conditioner is the power resources of air conditioner coolant circulation.
Referring to Fig. 2, the input 5 of civil power alternating current is the power resources of DC frequency converting air-conditioner operation.
Rectifying device 6 is direct current in conjunction with electrochemical capacitor 8 with AC rectification.
Power factor corrector 7 improves DC frequency converting air-conditioner to the service efficiency of civil power.
The main control chip 9 of outdoor controller is called for short DSP, and main being responsible for carried out communications exchange information with indoor controller, and the computing of space vector algorithm is to power inverter module 10 outputs six road pwm control signals.
Current sampling resistor 11 during the operation of the motor of compressor, purpose are that the current signal during with compressor operating is input to DSP, realize the closed-loop control of the motor running frequency of compressor.
Referring to Fig. 3, be the schematic diagram of the inside main devices of IPM module.
IGBT device for power switching 14 always has 6; Driving element 13 is the driving of IGBT device for power switching.Driving element 13 and IGBT device for power switching 14 join together to carry out six tunnel control signals of main control chip 9 outputs of outdoor controller, i.e. U
H, U
L, V
H, V
L, W
HAnd W
L
The control method of DC frequency converting air-conditioner is characterized in that may further comprise the steps:
Concrete, demand according to the cold-warm type DC frequency converting air-conditioner, outdoor controller 3 uses the first carrier frequency when refrigeration mode or dehumidifier pattern, the scope of this first carrier frequency is at 2KHz～6KHz, calculate the control parameter of the compressor of one group of DC frequency converting air-conditioner according to this first carrier frequency meter, and will control the primary importance that parameter is stored in outdoor memory 12.
Certainly, also can set the 3rd carrier frequency as required, the ultralow frequency operational mode of the corresponding DC frequency converting air-conditioner of the 3rd carrier frequency.
When the user utilizes control panel on remote controller 1 or the indoor set to set refrigeration or the start of dehumidifier pattern, after indoor controller 2 receives the refrigeration or dehumidifier pattern starting-up signal that the control panel on remote controller 1 or the indoor set sends, this signal is sent to outdoor controller 3, and outdoor controller 3 calls the control parameter of the primary importance of outdoor memory 12 and controls compressor.
When the user utilizes control panel on remote controller 1 or the indoor set to set the heating mode start, after indoor controller 2 receives the heating mode starting-up signal that the control panel on remote controller 1 or the indoor set sends, this signal is sent to outdoor controller 3, and outdoor controller 3 calls the control parameter of the second place of outdoor memory 12 and controls compressor.
For example, be the compressor of 3 pairs of utmost points for adopting motor, if in order to satisfy the demand that heats maximum running frequency 160Hz, can meet the demands just carrier frequency need be set to 8KHz.According to experiment repeatedly, when running refrigerating or dehumidifier pattern, frequency operates in about 80HZ the carrier frequency of 8KHZ under outdoor 36 ℃ of environment temperatures, and the heating of IPM module is very serious, reaches 90～100 ℃, surpasses the safe operation scope of IPM module.But if carrier frequency adopts 6K, then the heating of IPM module has improvement greatly under the similarity condition, can reduce about 20 ℃, and 70～80 ℃ of scopes, security improves a lot.
Claims (4)
1. the control method of a DC frequency converting air-conditioner, DC frequency converting air-conditioner comprises power inverter module I PM, the carrier frequency that it is characterized in that the pwm control signal of power inverter module is more than two kinds, and carrier frequency is corresponding with the mode of operation of DC frequency converting air-conditioner, may further comprise the steps during control:
Step 1 for the different working modes of DC frequency converting air-conditioner operation, pre-determines corresponding carrier frequency,
Step 2 according to the carrier frequency of determining after the selected mode of operation, is calculated the control parameter of corresponding compressor,
Step 3 is stored in the correspondence position of outdoor memory (12) with the control parameter of compressor,
Step 4, the user starts shooting when determining the different working modes of DC frequency converting air-conditioner operation, the starting-up signal that comprises mode of operation that indoor controller (2) will receive sends to outdoor controller (3), and outdoor controller (3) calls the control parameter of the compressor of the last relevant position of outdoor memory (12) and controls compressor.
2. the control method of DC frequency converting air-conditioner according to claim 1, the mode of operation that it is characterized in that described DC frequency converting air-conditioner comprises refrigeration mode, dehumidifier pattern and heating mode, wherein, the corresponding first carrier frequency of refrigeration mode and dehumidifier pattern, corresponding second carrier frequency of heating mode.
3. the control method of DC frequency converting air-conditioner according to claim 2 is characterized in that the scope of described first carrier frequency at 2KHz～6KHz, and the scope of second carrier frequency is at 6KHz～10KHz.
4. the control method of DC frequency converting air-conditioner according to claim 2 is characterized in that the mode of operation of described DC frequency converting air-conditioner also comprises the ultralow frequency operational mode, corresponding the 3rd carrier frequency of ultralow frequency operational mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103363629B (en) * | 2012-04-10 | 2016-04-13 | 珠海格力电器股份有限公司 | Controller and control method of air conditioner and air conditioner |
| JP5616413B2 (en) | 2012-10-04 | 2014-10-29 | ファナック株式会社 | Motor control device used by switching the PWM frequency |
| CN103968498B (en) * | 2013-01-31 | 2016-09-14 | 珠海格力电器股份有限公司 | Method for determining carrier frequency of variable frequency air conditioner and variable frequency air conditioner |
| CN104359184B (en) * | 2014-09-30 | 2017-02-15 | 海信科龙电器股份有限公司 | Carrier frequency conversion control method and controller |
| CN106225186B (en) * | 2016-09-28 | 2019-07-30 | 广东美的制冷设备有限公司 | Frequency-conversion air-conditioning system and its heat generation control method of power module, device |
| CN107166642B (en) * | 2017-05-16 | 2019-10-01 | 四川长虹电器股份有限公司 | DC fan control method outside a kind of convertible frequency air-conditioner room |
| CN109386999A (en) * | 2017-08-07 | 2019-02-26 | 大连新明华电子科技有限公司 | The control method of Efficient intelligent carbon-dioxide gas compressor controller |
| CN107919795B (en) * | 2017-12-14 | 2019-08-30 | 广东美的制冷设备有限公司 | Transducer air conditioning and its control method, device |
| CN109059207B (en) * | 2018-06-14 | 2020-11-27 | 珠海格力电器股份有限公司 | Carrier frequency control method and device of air conditioning unit and variable frequency air conditioner |
| CN111416565B (en) * | 2020-03-27 | 2023-07-04 | 四川长虹精密电子科技有限公司 | Variable carrier frequency motor control device and method |
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Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER OWNER: MEIDI ELECTRIC APPLIANCES CO., LTD., GUANGDONG Effective date: 20131211 |
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Effective date of registration: 20131211 Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: Midea Group Co., Ltd. Address before: 528311 Beijiao, Foshan, Shunde District, the town of Guangdong, the United States Avenue, No. 6 Patentee before: Meidi Electric Appliances Co., Ltd., Guangdong |