CN104734546A - Air conditioning unit and control method of same - Google Patents
Air conditioning unit and control method of same Download PDFInfo
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- CN104734546A CN104734546A CN201310723934.3A CN201310723934A CN104734546A CN 104734546 A CN104734546 A CN 104734546A CN 201310723934 A CN201310723934 A CN 201310723934A CN 104734546 A CN104734546 A CN 104734546A
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- China
- Prior art keywords
- direct current
- drive circuit
- current network
- consuming parts
- air
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/07—DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning unit and a control method of the air conditioning unit. The air conditioning unit comprises an electricity utilization component and a drive circuit. The drive circuit comprises a direct-current side and an alternating-current side. The direct-current side of the drive circuit is connected with a direct-current power grid, the alternating-current side of the drive circuit is connected with the electricity utilization component and used for converting the direct current of the direct-current power grid on the direct-current side into the alternating current required by working of the electricity utilization component. By means of the air conditioning unit and the control method of the air conditioning unit, the effect that the electricity loss of the air conditioning unit is lowered is achieved.
Description
Technical field
The present invention relates to field of air conditioning, in particular to the control method of a kind of air-conditioner set and air-conditioner set.
Background technology
Fig. 1 is the topological diagram of the air-conditioner set according to prior art.As shown in Figure 1, that air-conditioner set access is the alternating current AC of utility network single-phase alternating current (Alternation Current, be called for short AC) or three-phase four-wire system.Frequency-changeable compressor drives and frequency conversion fan drives entering the alternating current of air-conditioner set through AC/DC(Direct Current, direct current) after rectification, alternating current is become direct current, direct current after rectification is reverse into the alternating current of voltage and changeable frequency again through DC/AC, operate for driving frequency-changeable compressor M1 ' and frequency conversion fan M2 '.Meanwhile, the direct current through AC/DC rectification is also transformed into the direct current of low pressure through Switching Power Supply, for the control unit that frequency-changeable compressor drives and frequency conversion fan drives provides working power.Alternating current, by Switching Power Supply (AC conversion is direct current AC/DC), provides the working power of DC low-voltage to main control unit.The power supply of DC load (as transducers such as valve class, pressure sensor, temperature sensor such as equal fuel tap, cross valves) is supplied by the alternating current (as 220V alternating current) of high pressure.
The alternating current of access air-conditioning needs to become direct current after over commutation, then is transformed into alternating current for driving frequency-changeable compressor and frequency conversion fan by direct current, and the conversion links of electric energy process is more, and electric energy loss is large, and utilance is low.
For the problem that the electric energy loss of air-conditioner set in prior art is large, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is the control method providing a kind of air-conditioner set and air-conditioner set, with the large problem of the electric energy loss solving air-conditioner set.
To achieve these goals, according to an aspect of the present invention, a kind of air-conditioner set is provided.Air-conditioner set according to the present invention comprises: consuming parts; And drive circuit, drive circuit comprises DC side and AC, the DC side of drive circuit is connected with direct current network, and the AC of drive circuit is connected with consuming parts, for the alternating current of DC conversion needed for consuming parts work of the direct current network by DC side.
Further, consuming parts comprises compressor and blower fan, drive circuit comprises: compressor drive circuit, the DC side of compressor drive circuit is connected with direct current network, the AC of compressor drive circuit is connected with compressor, for by the alternating current of the DC conversion of direct current network needed for compressor operating; And fan drive circuit, the DC side of fan drive circuit is connected with direct current network, and the AC of fan drive circuit is connected with blower fan, for by the alternating current of the DC conversion of direct current network needed for blower fan work.
Further, air-conditioner set also comprises: DC load; Main control unit, is connected with DC load respectively with drive circuit, for controlling drive circuit and DC load; And Switching Power Supply, be connected respectively with main control unit with drive circuit, DC load, for by first direct current of the DC conversion of direct current network needed for drive circuit works, by second direct current of the DC conversion of direct current network needed for DC load work, by three direct current of the DC conversion of direct current network needed for main control unit work, wherein, the first direct current, the second direct current and the 3rd galvanic voltage are less than the galvanic voltage of direct current network.
Further, Switching Power Supply is inverse-excitation type switch power-supply, inverse-excitation type switch power-supply comprises: switch transformer, switch transformer comprises primary side and primary side, the primary side of switch transformer is connected with direct current network, and the primary side of switch transformer is connected with main control unit respectively with drive circuit, DC load; And switching tube, be connected between direct current network and the primary side of switch transformer.
Further, switch transformer comprises: armature winding, is connected with direct current network, for storing the direct current of direct current network; And secondary winding, comprise the first sub-secondary winding, the second sub-secondary winding, the 3rd sub-secondary winding and the 4th sub-secondary winding, first sub-secondary winding is connected with compressor drive circuit, second sub-secondary winding is connected with fan drive circuit, 3rd sub-secondary winding is connected with main control unit, and the 4th sub-secondary winding is connected with DC load.
Further, drive circuit comprises: rectification circuit, and rectification circuit comprises DC side and AC, and the DC side of rectification circuit is connected with direct current network, and the AC of rectification circuit is connected with consuming parts; Storage capacitor, is connected to two terminals of direct current network; Grading resistor, in parallel with storage capacitor, and be connected to two terminals of direct current network; And sample circuit, one end is connected with the AC of rectification circuit, and the other end is connected with main control unit, and the alternating current for the AC to rectification circuit is sampled.
Further, storage capacitor comprises the first electric capacity and the second electric capacity, the first end of the first electric capacity is connected with one end of direct current network, second end of the first electric capacity is connected with the first end of the second electric capacity, second end of the second electric capacity is connected with the other end of direct current network, grading resistor comprises the first resistance and the second resistance, the first end of the first resistance is connected with the first end of the first electric capacity, second end of the first resistance is connected with the second end of the first electric capacity, the first end of the second resistance is connected with the first end of the first resistance respectively with the first end of the second electric capacity, second end of the second resistance is connected with the second end of the second electric capacity.
Further, rectification circuit is Intelligent Power Module.
To achieve these goals, according to a further aspect in the invention, a kind of control method of air-conditioner set is provided.Air-conditioner set comprises: consuming parts; And drive circuit, drive circuit comprises DC side and AC, and the DC side of drive circuit is connected with direct current network, and the AC of drive circuit is connected with consuming parts, for the alternating current of DC conversion needed for consuming parts work of the direct current network by DC side
The control method of air-conditioner set is for controlling drive circuit, and this control method comprises: the voltage reference value obtaining the alternating current needed for consuming parts work; The voltage reference value of the alternating current needed for consuming parts work is modulated, obtains pulse width modulating signal; And control drive circuit by the alternating current of the DC conversion of the direct current network of DC side needed for consuming parts work by pulse width modulating signal.
Further, drive circuit comprises: rectification circuit, and rectification circuit comprises DC side and AC, and the DC side of rectification circuit is connected with direct current network, and the AC of rectification circuit is connected with consuming parts; Storage capacitor, is connected to two terminals of direct current network; Grading resistor, in parallel with storage capacitor, and be connected to two terminals of direct current network; And sample circuit, one end is connected with the AC of rectification circuit, and the other end is connected with main control unit, for the alternating current of the AC of rectification circuit of sampling, wherein, the voltage reference value of the alternating current obtained needed for consuming parts work comprises: the current reference value obtaining consuming parts; Obtain the electric current of the alternating current of the AC of rectification circuit; The electric current of the alternating current of the current reference value of consuming parts and the AC of rectification circuit is made comparisons; And comparative result is converted into the voltage reference value of the alternating current needed for consuming parts work.
Pass through the present invention, adopt the air-conditioner set comprising consuming parts and drive circuit, the alternating current needed for the work of DC conversion consuming parts direct current network inputted by drive circuit, only need the direct current of input to be resupplied after once changing consuming parts to use, the conversion links of electric energy in air-conditioner set is decreased relative to the air-conditioner set of prior art, solve the problem that the electric energy loss of air-conditioner set is large, reach the effect of the electric energy loss reducing air-conditioner set, and then improve the efficiency of air-conditioner set.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the topological diagram of the air-conditioner set according to prior art;
Fig. 2 is the topological diagram of air-conditioner set according to a first embodiment of the present invention;
Fig. 3 is the topological diagram of air-conditioner set according to a second embodiment of the present invention;
Fig. 4 is the communication topology figure of main control unit according to the embodiment of the present invention and drive circuit;
Fig. 5 is the topological diagram of the Switching Power Supply according to the embodiment of the present invention;
Fig. 6 is the circuit diagram of the drive circuit according to the embodiment of the present invention;
Fig. 7 is the flow chart of the control method of air-conditioner set according to a first embodiment of the present invention;
Fig. 8 is the flow chart of the control method of air-conditioner set according to a second embodiment of the present invention; And
Fig. 9 is the control block diagram of the control method of air-conditioner set according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiments provide a kind of air-conditioner set.
Fig. 2 is the topological diagram of air-conditioner set according to a first embodiment of the present invention.As shown in Figure 2, this air-conditioner set comprises consuming parts 1 and drive circuit 2.Consuming parts 1 can be that compressor or blower fan etc. exchange consuming parts, and wherein, compressor can be frequency-changeable compressor, and blower fan can be frequency conversion fan, and blower fan can be indoor fan or outdoor fan.Drive circuit 2 comprises DC side and AC, and the DC side of drive circuit 2 is connected with direct current network, and the DC side of drive circuit 2 can be connected with tributary electrical network by DC bus, and direct current network is for providing the direct current needed for air-conditioner set work.The AC of drive circuit 2 is connected with consuming parts 1, and drive circuit can be compressor drive circuit, also can be fan drive circuit.When consuming parts is compressor, the AC of compressor drive circuit is connected with compressor; When consuming parts is blower fan, the AC of fan drive circuit is connected with blower fan.Drive circuit 2 is that consuming parts 1 works required alternating current for the DC conversion of the direct current network by DC side, can be three-phase alternating current supply consuming parts 1 by the DC conversion of direct current network.Drive circuit 2 can by providing alternating current to consuming parts 1, and to drive consuming parts 1 to operate, wherein, compressor drive circuit may be used for driving frequency-changeable compressor running, and fan drive circuit operates for driving frequency conversion fan.
It should be noted that, the direct current network of the embodiment of the present invention can be the direct current network that such as photovoltaic generation produces, also can be that other export galvanic direct current network or DC power supply, " direct current network " in the present embodiment have improper restriction to the present invention.
Pass through the embodiment of the present invention, the DC conversion consuming parts 1 that direct current network inputs to be worked required alternating current by drive circuit 2, only need that the direct current of input is resupplied consuming parts 1 after once changing to use, the conversion links of electric energy in air-conditioner set is decreased relative to the air-conditioner set of prior art, solve the problem that the electric energy loss of air-conditioner set is large, reach the effect of the electric energy loss reducing air-conditioner set, and then improve the efficiency of air-conditioner set.
Fig. 3 is the topological diagram of air-conditioner set according to a second embodiment of the present invention.The air-conditioner set of this embodiment can as a kind of preferred implementation of the air-conditioner set of above-described embodiment.As shown in Figure 3, consuming parts 1 comprises compressor and blower fan, and drive circuit 2 comprises compressor drive circuit and fan drive circuit.
Compressor drive circuit comprises DC side and AC, the DC side of compressor drive circuit is connected with direct current network, can be by DC bus, the DC side of compressor drive circuit and direct current network are coupled together, the AC of compressor drive circuit is connected with compressor M1, and this compressor drive circuit is used for the alternating current of the DC conversion of direct current network needed for compressor M1 work.Wherein, the alternating current needed for compressor M1 work can be the alternating current of voltage and changeable frequency.The alternating current by compressor drive circuit the direct current of direct current network being reverse into voltage and changeable frequency through DC/AC is operated to drive compressor M1.
Fan drive circuit comprises DC side and AC, the DC side of fan drive circuit is connected with direct current network, can be by DC bus, the DC side of fan drive circuit and direct current network are coupled together, the AC of fan drive circuit is connected with blower fan M2, for by the alternating current of the DC conversion of direct current network needed for blower fan work.Wherein, the alternating current needed for blower fan M2 work can be the alternating current of voltage and changeable frequency.The alternating current by fan drive circuit the direct current of direct current network being reverse into voltage and changeable frequency through DC/AC is operated to drive blower fan M2.
Performance parameter is relevant with power separately for the voltage of the alternating current after compressor drive circuit inversion and the alternating current after fan drive circuit inversion and frequency and compressor M1 and blower fan M2, can be identical, also can be different.
Pass through the embodiment of the present invention, by compressor drive circuit and fan drive circuit the direct current of direct current network will be separately converted to the alternating current needed for compressor and blower fan work, reduce electric energy conversion links, create a further reduction the electric energy loss of air-conditioner set.
Preferably, air-conditioner set also comprises DC load, main control unit and Switching Power Supply.Wherein, DC load can be valve in air-conditioner set and transducer, and such as cross valve, all fuel tap, oil return valve, balanced valve, system high-low pressure measure valve and system high-low pressure sensor.
Main control unit is connected with DC load respectively with drive circuit 2, and this main control unit is for controlling drive circuit 2 and DC load.Main control unit can comprise multiple control unit, such as, for controlling the control unit of compressor and the control unit for controlling blower fan.Main control unit can be control chip, main control unit and drive circuit 2 can be connected by communication bus, as shown in Figure 4, when drive circuit 2 comprises compressor drive circuit and fan drive circuit, compressor drive circuit is connected by communication bus with main control unit with fan drive circuit, main control unit sends control signal by communication bus to compressor drive circuit and fan drive circuit, for controlling compressor drive circuit and fan drive circuit work.
Control unit is the mster-control centre of whole air-conditioner set, plays a part to detect, monitor and control.By detecting DC load, such as system high-low pressure, line temperature etc., monitor the data mode returned from slave computers such as driven compressor simultaneously, carry out next step control.
Control unit and the exchanges data between compressor drive circuit and fan drive circuit pass through communication mode, its carrier comprises 485 buses, UART(Universal Asynchronous Receiver/Transmitter, universal asynchronous receiving-transmitting transmitter) bus, a SPI(high speed, full duplex, synchronous communication bus) bus and CAN(ControllerArea Network, controller local area network) bus etc., adopt semiduplex master/slave communication pattern, control unit is host computer, compressor drive circuit and fan drive circuit, host computer is called the roll to slave computer, slave computer replys host computer after receiving point data, host computer can only put a slave computer at synchronization, and leave time slot and lose to prevent bus data conflict between each slave computer of roll-call.
Main control unit can also comprise the control unit for controlling DC load, controls DC load work for sending control signal to DC load.
Switching Power Supply is connected with main control unit respectively with drive circuit 2, DC load, for being that drive circuit 2 works the first required direct current by the DC conversion of direct current network.Switching Power Supply can be direct-current switch power supply, for the high voltage direct current of direct current network being converted into the low-voltage DC (DC/DC) in air-conditioner set needed for corresponding component work.When drive circuit 2 comprises compressor drive circuit and fan drive circuit, as shown in Figure 3, Switching Power Supply is connected with fan drive circuit respectively with compressor drive circuit (in Fig. 3 shown in dotted line), and the direct current of direct current network is connected with Switching Power Supply by DC bus.First direct current comprises the direct current needed for compressor drive circuit work and the direct current needed for electric fan drive circuit works, the direct current of direct current network is after the conversion of Switching Power Supply, and unification provides the direct current needed for compressor drive circuit work and the direct current needed for electric fan drive circuit works to compressor drive circuit and electric fan drive circuit.Direct current needed for compressor drive circuit work can be identical with the direct current needed for electric fan drive circuit works, also can be different.Further, the first galvanic voltage is 15V, that is to say that the direct current of direct current network is converted into through Switching Power Supply the direct current supply compressor drive circuit and electric fan drive circuit that voltage is 15V.
Switching Power Supply is also for by second direct current of the DC conversion of direct current network needed for DC load work.Second direct current can be the low-voltage DC of 36V and below 36V, be the low-voltage DC of the voltage request of load human-body safety by the DC conversion of direct current network by Switching Power Supply, supply DC load, then air-conditioner set controller part is all safe voltage everywhere, thus improve the security reliability of unit, avoid the potential safety hazard because air-conditioner set accessory electrical leakage problems brings, improve fail safe when maintenance, use.
In addition, Switching Power Supply also for by three direct current of the DC conversion of direct current network needed for main control unit work, the direct current of the 3rd direct current can be voltage be 24V.First direct current, the second direct current and the 3rd galvanic voltage are less than the galvanic voltage of direct current network.Such as, the first direct current can be 15V direct current, and the second direct current can be that 36V(contains) following direct current, the 3rd direct current can be 24V direct current.
It should be noted that, " first ", " second ", " the 3rd " of the embodiment of the present invention, being only the operating current in order to distinguish each period, not representing sequencing, do not have improper restriction to the present invention.
According to the embodiment of the present invention, by Switching Power Supply, be drive circuit 2 by the DC conversion of direct current network, main control unit and the low-voltage DC needed for DC load work, enhance the safety and reliability of air-conditioner set.In addition, due to except the inner compressor except exit of the electric cabinet of air-conditioner set and fan power, other are direct voltage, thus reduce the problem of the interlaced electromagnetic interference brought between dissimilar power supply.
Preferably, Switching Power Supply is inverse-excitation type switch power-supply, and inverse-excitation type switch power-supply comprises switch transformer T and switching tube Q1.
As shown in Figure 5, switch transformer T comprises primary side and primary side, and the primary side of switch transformer T is connected with direct current network, and the primary side of switch transformer T is connected with main control unit respectively with drive circuit 2, DC load.Switching tube, is connected between direct current network and the primary side of switch transformer.Isolated by switch transformer between the primary and secondary of Switching Power Supply, in switching tube Q1 conduction period, elementary at switch transformer of energy storage, at switching tube Q1 blocking interval, energy is delivered to primary side from the primary side of switch transformer T.
Wherein, as shown in Figure 5, switch transformer T comprises armature winding and secondary winding, and this armature winding is connected with direct current network, for storing the direct current of direct current network.Secondary winding comprises the first sub-secondary winding, the second sub-secondary winding, the 3rd sub-secondary winding and the 4th sub-secondary winding, first sub-secondary winding is connected with compressor drive circuit, second sub-secondary winding is connected with fan drive circuit, 3rd sub-secondary winding is connected with main control unit, and the 4th sub-secondary winding is connected with DC load.First secondary winding is used for the direct current providing 15V to compressor drive circuit, second sub-secondary winding is used for the direct current providing 15V to fan drive circuit, 3rd sub-secondary winding is used for the direct current providing 24V to main control unit, and the 4th sub-secondary winding is used for the direct current providing 36V or below 36V to DC load.
Preferably, drive circuit comprises rectification circuit, storage capacitor, grading resistor and sample circuit.
As shown in Figure 6, rectification circuit comprises DC side and AC, and the DC side of rectification circuit is connected with direct current network, and the AC of rectification circuit is connected with consuming parts.This rectification circuit can be three-phase PWM (pulse width modulation) rectification circuit, preferably, this rectification circuit is Intelligent Power Module (Intelligent Power Module, referred to as IPM), this rectification circuit comprises insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, referred to as IGBT) Q1, Q2, Q3, Q4, Q5 and Q6 and sustained diode 1, D2, D3, D4, D5 and D6.In power model, Q1, Q2, Q3, Q4, Q5 are connected with PWM6 with PWM1, PWM2, PWM3, PWM4, PWM5 of processor respectively successively with the grid of Q6, the collector electrode of IGBT pipe Q1 is connected with sustained diode 1 negative electrode, the emitter of IGBT pipe Q1 is connected with sustained diode 1 anode, the annexation of IGBT pipe Q2, Q3, Q4, Q5 and Q6 and sustained diode 2, D3, D4, D5 and D6 is similar with the annexation of IGBT pipe Q1 and sustained diode 1, does not repeat here.The emitter of IGBT pipe Q1 is connected with IGBT pipe Q2 collector electrode, and the emitter of IGBT pipe Q3 is connected with IGBT pipe Q4 collector electrode, and the emitter of IGBT pipe Q5 is connected with IGBT pipe Q6 collector electrode.The U line of consuming parts 1 is connected with the emitter of IGBT pipe Q1, and its voltage is designated as Ua, and the V line of consuming parts 1 is connected with the emitter of IGBT pipe Q3, and its voltage is designated as Ub, and the W line of consuming parts 1 is connected with the emitter of IGBT pipe Q5, and its voltage is designated as Uc.
Storage capacitor is connected to two terminals of direct current network.As shown in phantom in Figure 6, storage capacitor can be storage capacitor array, and wherein, the capacity of electric capacity, by the power decision of consuming parts 1, may be used for the direct current storing direct current network.Further, storage capacitor comprises the first electric capacity C1 and the second electric capacity C2, the first end of the first electric capacity C1 is connected with one end of direct current network, and second end of the first electric capacity C1 is connected with the first end of the second electric capacity C2, and second end of the second electric capacity C2 is connected with the other end of direct current network.
Grading resistor is in parallel with storage capacitor, and is connected to two terminals of direct current network.Further, grading resistor comprises the first resistance R1 and the second resistance R2.As shown in Figure 6, the first end of the first resistance R1 is connected with the first end of the first electric capacity C1, second end of the first resistance R1 is connected with second end of the first electric capacity C1, the first end of the second resistance R2 is connected with the first end of the first resistance R1 respectively with the first end of the second electric capacity C2, and second end of the second resistance R2 is connected with second end of the second electric capacity C2.
One end of sample circuit is connected with the AC of rectification circuit, and the other end is connected with main control unit Ctrol, for the alternating current of the AC of rectification circuit of sampling.As shown in Figure 6, the U line and V line of the AC of rectification circuit are respectively arranged with current sensor 21, line current Iu on U line of sampling and the line current Iv on V line, and the line current Iv on the line current Iu on U line and V line is exported to main control unit Ctrol.
The VDC1 that in Fig. 6, the first resistance R1 holds represents the input of the working power of drive circuit 2, and the VDC2 that main control unit Ctrol connects represents the input of the working power of main control unit Ctrol.
The Intelligent Power Module (IPM) of the embodiment of the present invention is a three phase full bridge power device, and be divided into six unit, each unit is combined by IGBT and diodes in parallel.Its operation principle is: the alternating current becoming frequency and voltage variable DC inverter by Intelligent Power Module (IPM), for driving compressor and blower fan.Control unit Ctrol samples consuming parts 1(compressor or blower fan) input current, export PWM1-PWM6 control signal and control Intelligent Power Module (IPM).
The embodiment of the present invention additionally provides a kind of control method of air-conditioner set.The method operates on air-conditioning.It should be noted that, the control method of the air-conditioner set of the embodiment of the present invention may be used for controlling the air-conditioner set that the embodiment of the present invention provides, and the air-conditioner set of the embodiment of the present invention also may be used for the control method performing the air-conditioner set that the embodiment of the present invention provides.
Fig. 7 is the flow chart of the control method of air-conditioner set according to a first embodiment of the present invention.The air-conditioner set of this embodiment comprises consuming parts and drive circuit, wherein, drive circuit comprises DC side and AC, the DC side of drive circuit is connected with direct current network, the AC of drive circuit is connected with consuming parts, for the alternating current of DC conversion needed for consuming parts work of the direct current network by DC side.The control method of the air-conditioner set of the present embodiment may be used for the drive circuit controlling air-conditioner set, and as shown in Figure 7, it is as follows that the control method of this air-conditioner set comprises step:
Step S101, obtains the voltage reference value of the alternating current needed for consuming parts work.
This consuming parts can be the consuming parts 1 shown in Fig. 1, and this consuming parts 1 can be compressor or blower fan.The work voltage reference value of required alternating current of consuming parts 1 can be the reference value preset, also the voltage reference value of electric current after PI controller regulates of sampling can be through, three-phase voltage U x(x=a such as in the drive circuit of the embodiment of the present invention, b, reference value c), that is to say and drive consuming parts 1(compressor or blower fan) the variable alternating voltage of frequency and voltage.
Step S102, modulates the voltage reference value of the alternating current needed for consuming parts work, obtains pulse width modulating signal.
Get consuming parts 1 work required alternating current voltage reference value after, SPWM(sinusoidal pulse width modulation can be adopted) modulator approach, by three-phase voltage U x(x=a, b, c) and triangular carrier make comparisons, thus produce and be used for pulse width modulation (PWM) signal of drive circuit 2.Wherein, pwm signal can comprise PWM1, PWM2, PWM3, PWM4, PWM5 and PWM6 six tunnel control signal.
Step S103, controls drive circuit by the alternating current of the DC conversion of the direct current network of DC side needed for consuming parts work by pulse width modulating signal.
Carry out after modulation obtains pulse width modulating signal at the voltage reference value of the required alternating current that works to consuming parts 1, drive circuit 2 is controlled by pwm signal, in order to drive consuming parts 1, pwm signal can comprise PWM1, PWM2, PWM3, PWM4, PWM5 and PWM6 six tunnel control signal, be respectively used to control IGBT pipe Q1, Q2, Q3, Q4, Q5 and Q6, thus control drive circuit 2 by the alternating current of the DC conversion of the direct current network of DC side needed for consuming parts work.
According to the embodiment of the present invention, modulated by the voltage reference value of the required alternating current that works to consuming parts 1, obtain pwm signal, in order to control drive circuit 2 by the alternating current of the DC conversion of the direct current network of DC side needed for consuming parts work, in order to drive consuming parts 1 to operate, thus realize regulating the consuming parts 1 required alternating current that works.
Fig. 8 is the flow chart of the control method of air-conditioner set according to a second embodiment of the present invention.The control method of the air-conditioner set of this embodiment can be a kind of preferred implementation of the control method of the air-conditioner set of above-described embodiment.
Wherein, the drive circuit 2 of the embodiment of the present invention comprises: rectification circuit, storage capacitor, grading resistor and sample circuit.Rectification circuit comprises DC side and AC, and the DC side of rectification circuit is connected with direct current network, and the AC of rectification circuit is connected with consuming parts.Storage capacitor is connected to two terminals of direct current network.Grading resistor is in parallel with storage capacitor, and is connected to two terminals of direct current network.One end of sample circuit is connected with the AC of rectification circuit, and the other end is connected with main control unit, for the alternating current of the AC of rectification circuit of sampling.As shown in Figure 8, to comprise step as follows for the control method of this air-conditioner set:
Step S201, obtains the current reference value of consuming parts.
Before the current reference value obtaining consuming parts, can be first the speed reference of consuming parts 1 and the actual rotating speed detected are made mathematic interpolation, wherein, the reference value of rotating speed can be the tach signal of the main control unit obtained in advance, and the actual rotating speed detected can be the consuming parts 1(compressor or blower fan that are detected in advance by transducer) rotating speed.The speed reference of consuming parts 1 and the actual rotating speed detected are made mathematic interpolation, by PI(proportional integral) controller obtains the reference value of electric current after regulating, and this current reference value is the current reference value of consuming parts 1.Obtain this current reference value for controlling drive circuit 2.
Step S202, obtains the electric current of the alternating current of the AC of rectification circuit.
The alternating current of the AC of rectification circuit is that consuming parts 1 works required alternating current, and the electric current of this alternating current can be sampled in advance by current sensor 21 and be obtained, and main control unit obtains the electric current that this sampling obtains.
Step S203, makes comparisons the electric current of the alternating current of the current reference value of consuming parts and the AC of rectification circuit.
After the electric current of the alternating current of the AC of the current reference value and rectification circuit that get consuming parts 1, the electric current of the alternating current of the AC of the current reference value of consuming parts 1 and rectification circuit can be compared by comparator, namely, current reference value and the actual electric current detected are made comparisons, as, current reference value and the actual electric current detected are done the process such as difference.
Step S204, is converted into the voltage reference value of the alternating current needed for consuming parts work by comparative result.
After the electric current of the alternating current by the current reference value of consuming parts and the AC of rectification circuit is made comparisons, comparative result can be converted into the voltage reference value of the alternating current needed for consuming parts work.Such as, current reference value and the actual electric current detected are done difference, the difference obtained is regulated by PI controller, after PI controller regulates, obtain three-phase voltage U x(x=a, b, c) reference value of consuming parts 1.
Step S205, modulates the voltage reference value of the alternating current needed for consuming parts work, obtains pulse width modulating signal.
Get consuming parts 1 work required alternating current voltage reference value after, SPWM(sinusoidal pulse width modulation can be adopted) modulator approach, by three-phase voltage U x(x=a, b, c) and triangular carrier make comparisons, thus produce and be used for pulse width modulation (PWM) signal of drive circuit 2.Wherein, pwm signal can comprise PWM1, PWM2, PWM3, PWM4, PWM5 and PWM6 six tunnel control signal.
Step S206, controls drive circuit by the alternating current of the DC conversion of the direct current network of DC side needed for consuming parts work by pulse width modulating signal.
Carry out after modulation obtains pulse width modulating signal at the voltage reference value of the required alternating current that works to consuming parts 1, drive circuit 2 is controlled by pwm signal, in order to drive consuming parts 1, pwm signal can comprise PWM1, PWM2, PWM3, PWM4, PWM5 and PWM6 six tunnel control signal, be respectively used to control IGBT pipe Q1, Q2, Q3, Q4, Q5 and Q6, thus control drive circuit 2 by the alternating current of the DC conversion of the direct current network of DC side needed for consuming parts work.
As shown in Figure 9, the drive circuit 2 of the embodiment of the present invention adopts double-closed-loop control, and its outer-loop is speed ring, and speed reference Wn* is the tach signal of reception control unit, speed reference Wn* does difference with the actual rotating speed Wr detected, and this difference obtains the reference value I* of inner ring through PI controller; Inner ring is electric current loop, its reference value I* is that outer shroud speed ring is given, reference value I* does difference with the actual electric current I detected, this difference obtains compressor/blower fan three-phase phase voltage value Ux(x=a, b, c) reference value after PI controller, the alternating voltage also namely for driving the frequency and voltage of compressor/blower fan variable.Then adopt SPWM modulator approach, by Ux(x=a, b, c) make comparisons with triangular carrier, the pwm signal of generation control IGBT.For each phase, the pwm signal of upper and lower bridge arm IGBT is complementary, namely can not conducting simultaneously.Wherein, upper brachium pontis IGBT comprises IGBT pipe Q1, Q3 and Q5, and lower brachium pontis IGBT comprises IGBT pipe Q2, Q4 and Q6.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an air-conditioner set, is characterized in that, comprising:
Consuming parts; And
Drive circuit, described drive circuit comprises DC side and AC, the DC side of described drive circuit is connected with direct current network, the AC of described drive circuit is connected with described consuming parts, for the alternating current of DC conversion needed for described consuming parts work of the direct current network by described DC side.
2. air-conditioner set according to claim 1, is characterized in that, described consuming parts comprises compressor and blower fan, and described drive circuit comprises:
Compressor drive circuit, the DC side of described compressor drive circuit is connected with direct current network, the AC of described compressor drive circuit is connected with described compressor, for by the alternating current of the DC conversion of described direct current network needed for described compressor operating; And
Fan drive circuit, the DC side of described fan drive circuit is connected with described direct current network, and the AC of described fan drive circuit is connected with described blower fan, for by the alternating current of the DC conversion of described direct current network needed for described blower fan work.
3. air-conditioner set according to claim 1 and 2, is characterized in that, described air-conditioner set also comprises:
DC load;
Main control unit, is connected with described DC load respectively with described drive circuit, for controlling described drive circuit and described DC load; And
Switching Power Supply, be connected respectively with described main control unit with described drive circuit, described DC load, for by first direct current of the DC conversion of described direct current network needed for described drive circuit works, by second direct current of the DC conversion of described direct current network needed for described DC load work, by three direct current of the DC conversion of described direct current network needed for described main control unit work, wherein, described first direct current, described second direct current and described 3rd galvanic voltage are less than the galvanic voltage of described direct current network.
4. air-conditioner set according to claim 3, is characterized in that, described Switching Power Supply is inverse-excitation type switch power-supply, and described inverse-excitation type switch power-supply comprises:
Switch transformer, described switch transformer comprises primary side and primary side, the primary side of described switch transformer is connected with described direct current network, and the primary side of described switch transformer is connected with described main control unit respectively with described drive circuit, described DC load; And
Switching tube, between the primary side being connected to described direct current network and described switch transformer.
5. air-conditioner set according to claim 4, is characterized in that, described switch transformer comprises:
Armature winding, is connected with described direct current network, for storing the direct current of described direct current network; And
Secondary winding, comprise the first sub-secondary winding, the second sub-secondary winding, the 3rd sub-secondary winding and the 4th sub-secondary winding, described first sub-secondary winding is connected with described compressor drive circuit, described second sub-secondary winding is connected with described fan drive circuit, described 3rd sub-secondary winding is connected with described main control unit, and described 4th sub-secondary winding is connected with described DC load.
6. air-conditioner set according to claim 1, is characterized in that, described drive circuit comprises:
Rectification circuit, described rectification circuit comprises DC side and AC, and the DC side of described rectification circuit is connected with described direct current network, and the AC of described rectification circuit is connected with described consuming parts;
Storage capacitor, is connected to two terminals of described direct current network;
Grading resistor, in parallel with described storage capacitor, and be connected to two terminals of described direct current network; And
Sample circuit, one end is connected with the AC of described rectification circuit, and the other end is connected with main control unit, and the alternating current for the AC to described rectification circuit is sampled.
7. air-conditioner set according to claim 6, is characterized in that,
Described storage capacitor comprises the first electric capacity and the second electric capacity, the first end of described first electric capacity is connected with one end of described direct current network, second end of described first electric capacity is connected with the first end of described second electric capacity, second end of described second electric capacity is connected with the other end of described direct current network
Described grading resistor comprises the first resistance and the second resistance, the first end of described first resistance is connected with the first end of described first electric capacity, second end of described first resistance is connected with the second end of described first electric capacity, the first end of described second resistance is connected with the first end of described first resistance respectively with the first end of described second electric capacity, and the second end of described second resistance is connected with the second end of described second electric capacity.
8. air-conditioner set according to claim 6, is characterized in that, described rectification circuit is Intelligent Power Module.
9. a control method for air-conditioner set, is characterized in that, described air-conditioner set comprises:
Consuming parts; And
Drive circuit, described drive circuit comprises DC side and AC, the DC side of described drive circuit is connected with direct current network, the AC of described drive circuit is connected with described consuming parts, for the alternating current of DC conversion needed for described consuming parts work of the direct current network by DC side
Described control method, for controlling described drive circuit, comprising:
Obtain the voltage reference value of the alternating current needed for described consuming parts work;
The voltage reference value of the alternating current needed for described consuming parts work is modulated, obtains pulse width modulating signal; And
Described drive circuit is controlled by the alternating current of the DC conversion of the direct current network of DC side needed for described consuming parts work by described pulse width modulating signal.
10. the control method of air-conditioner set according to claim 9, is characterized in that, described drive circuit comprises:
Rectification circuit, described rectification circuit comprises DC side and AC, and the DC side of described rectification circuit is connected with described direct current network, and the AC of described rectification circuit is connected with described consuming parts;
Storage capacitor, is connected to two terminals of described direct current network;
Grading resistor, in parallel with described storage capacitor, and be connected to two terminals of described direct current network; And
Sample circuit, one end is connected with the AC of described rectification circuit, and the other end is connected with main control unit, for the alternating current of the AC of described rectification circuit of sampling,
Wherein, the voltage reference value of the alternating current obtained needed for described consuming parts work comprises:
Obtain the current reference value of described consuming parts;
Obtain the electric current of the alternating current of the AC of described rectification circuit;
The electric current of the alternating current of the AC of the current reference value of described consuming parts and described rectification circuit is made comparisons; And
Comparative result is converted into the voltage reference value of the alternating current needed for described consuming parts work.
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| CN201310723934.3A CN104734546A (en) | 2013-12-24 | 2013-12-24 | Air conditioning unit and control method of same |
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