CN106208885B - The control method of the control system and pfc circuit of air conditioner and micro-compressor - Google Patents

The control method of the control system and pfc circuit of air conditioner and micro-compressor Download PDF

Info

Publication number
CN106208885B
CN106208885B CN201610512298.3A CN201610512298A CN106208885B CN 106208885 B CN106208885 B CN 106208885B CN 201610512298 A CN201610512298 A CN 201610512298A CN 106208885 B CN106208885 B CN 106208885B
Authority
CN
China
Prior art keywords
voltage
compressor
micro
pfc circuit
bus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610512298.3A
Other languages
Chinese (zh)
Other versions
CN106208885A (en
Inventor
段鸣航
宋万杰
杜鑫龙
任新杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Meizhi Compressor Co Ltd
Anhui Meizhi Precision Manufacturing Co Ltd
Original Assignee
Guangdong Meizhi Compressor Co Ltd
Anhui Meizhi Precision Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Meizhi Compressor Co Ltd, Anhui Meizhi Precision Manufacturing Co Ltd filed Critical Guangdong Meizhi Compressor Co Ltd
Priority to CN201610512298.3A priority Critical patent/CN106208885B/en
Publication of CN106208885A publication Critical patent/CN106208885A/en
Application granted granted Critical
Publication of CN106208885B publication Critical patent/CN106208885B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/024Compressor control by controlling the electric parameters, e.g. current or voltage

Abstract

The invention discloses the control method of the control system and pfc circuit of a kind of air conditioner and micro-compressor, the control system includes: controllable switch, and the first end of controllable switch is connected with one end of DC power supply;Pfc circuit, the first input end of pfc circuit are connected with the second end of controllable switch;The third end of inverter circuit, the first input end of inverter circuit and the first output end of pfc circuit and controllable switch is respectively connected with;The DC bus-bar voltage of voltage detection unit detection micro-compressor;Control unit first end and second end of control controllable switch when DC bus-bar voltage is less than predetermined voltage threshold is connected, and first voltage is converted to three-phase voltage the voltage of DC power supply is increased to first voltage by pfc circuit, and by control inverter circuit to power to micro-compressor by the switching tube of output pwm signal to pfc circuit.Input side power factor not only can be improved in the system, but also can be improved system resists under-voltage ability and input voltage range.

Description

The control method of the control system and pfc circuit of air conditioner and micro-compressor
Technical field
The present invention relates to Compressor Technology field, in particular to a kind of control system of micro-compressor, a kind of miniature pressure The control method of PFC (Power Factor Correction, PFC) circuit of contracting machine and a kind of air conditioner.
Background technique
Micro-compressor have it is small in size, light-weight, work it is quiet, almost it is without friction, low energy consumption, can be by battery, the sun The advantages of power supply such as energy and vehicle power supply, it is widely used in the occasions such as air conditioner, water cooling plant and mini refrigerating system, has There is preferable development prospect.
Due to the limitation of application and condition, the controller of micro-compressor generally uses the confession of low-voltage DC at present Electric mode eliminates the volume and weight that controller is substantially reduced by the conversion links of industrial-frequency alternating current to direct current, simultaneously Also reduce cost.But the power factor of input side is not high, and the range of acceptable input voltage is smaller, vulnerable to electricity Source influence of fluctuations is easy to appear the fault conditions such as under-voltage.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, the first purpose of this invention is to propose a kind of control system of micro-compressor, the system is under-voltage In the case of control pfc circuit work, input side power factor not only can be improved, but also significantly enhance micro-compressor low pressure Resist under-voltage ability when operation, and expands the range of input voltage.
Second object of the present invention is to propose a kind of air conditioner.
Third object of the present invention is to propose a kind of control method of the pfc circuit of micro-compressor.
To achieve the above object, first aspect present invention embodiment proposes a kind of control system of micro-compressor, packet Include: controllable switch, the first end of the controllable switch are connected with one end of DC power supply;Pfc circuit, the pfc circuit include Inductance, diode and switching tube, the first input end of the pfc circuit are connected with the second end of the controllable switch, the PFC Second input terminal of circuit is connected with the other end of the DC power supply;Inverter circuit, the first input end of the inverter circuit It is respectively connected with the first output end of the pfc circuit and the third end of the controllable switch, the second of the inverter circuit is defeated Enter end to be connected with the second output terminal of the pfc circuit;Voltage detection unit, the direct current for detecting the micro-compressor are female Line voltage;Control unit, described control unit are connected with the controllable switch, the switching tube and the inverter circuit respectively, For controlling the first end of the controllable switch when the DC bus-bar voltage is less than predetermined voltage threshold and described controllably opening The second end of pass is connected, and exports PWM (Pulse Width Modulation, pulse width modulation) signal to the switch Pipe is to be increased to first voltage for the voltage of the DC power supply by the pfc circuit, and passes through the control inversion electricity The first voltage is converted to three-phase voltage by road, to power to the micro-compressor.
The control system of micro-compressor according to an embodiment of the present invention is less than predetermined voltage threshold in DC bus-bar voltage When, the first end of control unit control controllable switch is connected with the second end of controllable switch, and output pwm signal is to switching tube The voltage of DC power supply is increased to first voltage by pfc circuit, and by controlling inverter circuit for first voltage turn It is changed to three-phase voltage, to power to micro-compressor.The system controls pfc circuit work under undervoltage condition, can not only mention High input side power factor, and resist under-voltage ability when significantly enhancing micro-compressor low pressure operation, and expanded input The range of voltage.
According to one embodiment of present invention, described control unit is also used to be more than or equal to institute in the DC bus-bar voltage The first end that the controllable switch is controlled when stating predetermined voltage threshold is connected with the third end of the controllable switch, and stops defeated The pwm signal directly turns the voltage of the DC power supply to the switching tube, and by controlling the inverter circuit out It is changed to the three-phase voltage.
According to one embodiment of present invention, the control system of above-mentioned micro-compressor, further includes: filter circuit, institute Stating filter circuit is electrolytic capacitor, and the electrolytic capacitor is connected in parallel between the input terminal of the inverter circuit.
According to one embodiment of present invention, the voltage of the DC power supply is 12V, 24V or 48V.
To achieve the above object, second aspect of the present invention embodiment proposes a kind of air conditioner comprising above-mentioned is miniature The control system of compressor.
The air conditioner of the embodiment of the present invention is controlled under undervoltage condition by the control system of above-mentioned micro-compressor Pfc circuit work, it is anti-when input side power factor not only can be improved, but also significantly enhancing micro-compressor low pressure operation Under-voltage ability, and the range of input voltage has been expanded, micro-compressor reliability of operation is improved, and then improve air conditioner Reliability.
To achieve the above object, third aspect present invention embodiment proposes a kind of control of the pfc circuit of micro-compressor Method processed, the pfc circuit include inductance, diode and switching tube, and the input terminal of the pfc circuit is by controllable switch and directly Galvanic electricity source is connected, and the output end of the pfc circuit is connected with the input terminal of inverter circuit, the output end of the inverter circuit and institute It states micro-compressor to be connected, the described method comprises the following steps: detecting the DC bus-bar voltage of the micro-compressor, and judge Whether the DC bus-bar voltage is less than predetermined voltage threshold;If the DC bus-bar voltage is less than the predeterminated voltage threshold Value, then by controlling the controllable switch so that the pfc circuit is connected with the DC power supply, and output pwm signal is extremely The switching tube is to be increased to first voltage for the voltage of the DC power supply by the pfc circuit, and passes through control institute It states inverter circuit and the first voltage is converted into three-phase voltage, to power to the micro-compressor.
The control method of the pfc circuit of micro-compressor according to an embodiment of the present invention, when DC bus-bar voltage is less than in advance If when voltage threshold, by control controllable switch so that pfc circuit is connected with DC power supply, and output pwm signal is extremely switched Pipe is to be increased to first voltage for the voltage of DC power supply by pfc circuit, and passes through control inverter circuit for first voltage Three-phase voltage is converted to, to power to micro-compressor.This method controls pfc circuit work under undervoltage condition, not only can be with Resist under-voltage ability when improving input side power factor, and significantly enhancing micro-compressor low pressure operation, and has expanded defeated Enter the range of voltage.
According to one embodiment of present invention, if the DC bus-bar voltage is more than or equal to the predetermined voltage threshold, Then by controlling the controllable switch so that the pfc circuit is short-circuit, and stop exporting the pwm signal to the switching tube, It and by controlling the inverter circuit is directly the three-phase voltage by the voltage inversion of the DC power supply.
According to one embodiment of present invention, the control method of the pfc circuit of above-mentioned micro-compressor, further includes: sentence Whether the micro-compressor that breaks is in the operation phase;If the micro-compressor is in the operation phase, judging It when the DC bus-bar voltage is less than the predetermined voltage threshold, first controls the micro-compressor and shuts down, then pass through control institute Controllable switch is stated so that the pfc circuit is connected with the DC power supply.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the control system of micro-compressor according to an embodiment of the invention;
Fig. 2 is the flow chart of the control method of the pfc circuit of micro-compressor according to an embodiment of the invention;
Fig. 3 is the control method of pfc circuit in micro-compressor start-up course according to an embodiment of the invention;And
Fig. 4 is the control method of pfc circuit when micro-compressor according to an embodiment of the invention is in the operation phase.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the control system of micro-compressor of the embodiment of the present invention, the PFC of micro-compressor described The control method and air conditioner of circuit.
Fig. 1 is the structural schematic diagram of the control system of micro-compressor according to an embodiment of the invention.Such as Fig. 1 institute Show, the control system of the micro-compressor includes: controllable switch 10, pfc circuit 20, inverter circuit 30, voltage detection unit (figure In it is not specifically illustrated) and control unit 40.
Wherein, the first end of controllable switch 10 is connected with one end of DC power supply VCC.Pfc circuit 20 includes inductance L, two The first input end of pole pipe D and switching tube Q, pfc circuit 20 are connected with the second end of controllable switch 10, and the second of pfc circuit 20 Input terminal is connected with the other end of DC power supply VCC.The first input end of inverter circuit 30 and the first output end of pfc circuit 20 It is respectively connected with the third end of controllable switch 10, the second output terminal phase of the second input terminal and pfc circuit 20 of inverter circuit 30 Even.
In an embodiment of the present invention, the voltage of DC power supply VCC can be 12V, 24V or 48V, DC power supply VCC It may not need setting rectification link.
Voltage detection unit is used to detect the DC bus-bar voltage of micro-compressor.For example, electric resistance partial pressure method can be used Detect DC bus-bar voltage.Control unit 40 is connected with controllable switch 10, switching tube Q and inverter circuit 30 respectively, for straight The first end of control controllable switch 10 is connected with the second end of controllable switch 10 when stream busbar voltage is less than predetermined voltage threshold, And output pwm signal to switching tube Q the voltage of DC power supply VCC is increased to first voltage, Yi Jitong by pfc circuit 20 It crosses control inverter circuit 30 and first voltage is converted into three-phase voltage, to power to micro-compressor.Wherein, predetermined voltage threshold It can be demarcated according to the actual situation.
Specifically, when the switching tube Q conducting in pfc circuit 20, DC power supply VCC carries out charging energy-storing to inductance L, inverse The input voltage on power transformation road 30 will be maintained at DC bus-bar voltage;When switching tube Q shutdown, it is total to by DC power supply VCC and inductance L Be all inverter circuit 30 power, then realize the promotion to input voltage, specifically boost number, by being applied on switching tube Q Trigger pulse duty ratio determine.Therefore, when the DC bus-bar voltage of detection is less than predetermined voltage threshold (for example, can be The 80% of standard input) when, the first end that control unit 40 controls controllable switch 10 is connected with the second end of controllable switch 10, So that pfc circuit 20 is connected with DC power supply VCC, while 40 output pwm signal of control unit is to the switching tube of pfc circuit 20 DC bus-bar voltage is promoted to predetermined voltage threshold or more by the reasonable on-off of switch tube Q, at this time control unit 40 by Q The controllable normal work of inverter circuit 30 is powered with exporting three-phase voltage to micro-compressor, so that micro-compressor can be with Continue to work normally.
Therefore, the control system of the micro-compressor of the embodiment of the present invention is lower than predeterminated voltage threshold in DC bus-bar voltage When value, the tangential pfc circuit of controllable switch is controlled, and starts pfc circuit work, input side power factor not only can be improved, and And DC bus-bar voltage can be promoted to by normal range (NR) by the reasonable on-off to switching tube in pfc circuit, it significantly enhances Resist under-voltage ability when micro-compressor low pressure operation, and expanded the range of input voltage, to effectively prevent under-voltage In the case of, directly avoid micro-compressor caused by micro-compressor and component damage that can not continue by cutting off the power The case where normal work.
According to one embodiment of present invention, control unit 40 is also used to be more than or equal to predeterminated voltage in DC bus-bar voltage The first end that controllable switch 10 is controlled when threshold value is connected with the third end of controllable switch 10, and stops output pwm signal to opening Pipe Q is closed, and the voltage of DC power supply VCC is directly converted into three-phase voltage by controlling inverter circuit 30.
Specifically, DC power supply VCC is without warp when the DC bus-bar voltage of detection is more than or equal to predetermined voltage threshold It crosses pfc circuit to boost, but is directly inputted into inverter circuit 30, it, at this time can be by pfc circuit 20 into normal operating conditions Short circuit is carried out, i.e., the first end that control unit 40 controls controllable switch 10 is connected with the third end of controllable switch 10, prohibits simultaneously Only output pwm signal is to switching tube Q.
According to one embodiment of present invention, as shown in Figure 1, the control system of above-mentioned micro-compressor further include: filter Wave circuit, filter circuit are electrolytic capacitor EC, and electrolytic capacitor EC is connected in parallel between the input terminal of inverter circuit 30.
Specifically, when DC bus-bar voltage is lower than predetermined voltage threshold, it is tangential that control unit 40 controls controllable switch 10 Pfc circuit 20, and start the start-up operation of pfc circuit 20, after DC power supply VCC first passes through pfc circuit boosting, then pass through electrolysis electricity Hold EC and filter out higher hamonic wave to obtain stable DC, be then input to inverter circuit 30 again, entire circuit enters under-voltage guarantor Protect working condition;When DC bus-bar voltage is higher than predetermined voltage threshold, control unit 40 controls controllable switch 10 for pfc circuit 20 short circuits, while forbidding output pwm signal to switching tube Q, DC power supply needs not move through pfc circuit and boosts, but directly It is input to inverter circuit 30.
In addition, in an embodiment of the present invention, control unit 40 controls micro-compressor using vector control mode System.In control process, the phase current of micro-compressor is sampled by single resistor current, and micro- according to the phase current reconstruction of sampling The three-phase current of type compressor, then control unit 40 is coordinately transformed three-phase current and PI (Proportional Integral, proportional integration) adjust etc., to obtain reference voltage vector amplitude and phase, finally it is based on SVPWM (Space Vector Pulse Width Modulation, space vector pulse width modulation) basic principle obtains vector and falls in different fans When in area in inverter circuit 30 6 switching tubes conducting dutycycle, then realize the control to micro-compressor.Since control is single Member simultaneously controls the switching tube of inverter circuit and pfc circuit, significantly reduces PCB (Printed Circuit Board, printed circuit board) space, thus can effectively reduce PCB size and reduce cost.Moreover, because using single electricity Resistance current sample mode reconstructs the three-phase current of micro-compressor, has not only abandoned traditional sensor current sampling, but also save At least one sampling resistor has been removed, the cost of component is effectively saved, has increased the market competitiveness of control unit.
In conclusion the control system of micro-compressor according to an embodiment of the present invention, is less than pre- in DC bus-bar voltage If when voltage threshold, the first end of control unit control controllable switch is connected with the second end of controllable switch, and exports PWM letter Number to switching tube the voltage of DC power supply is increased to first voltage by pfc circuit, and will by control inverter circuit First voltage is converted to three-phase voltage, to power to micro-compressor.The system controls pfc circuit work under undervoltage condition, Resist under-voltage ability when input side power factor not only can be improved, but also significantly enhancing micro-compressor low pressure operation, and The range of input voltage is expanded.And it is controlled using single-chip, and Mini compressed is reconstructed using single resistor current sample mode The three-phase current of machine effectively reduces the usage quantity of component, reduces the size of PCB, reduces costs, increases price Advantage.
Fig. 2 is the flow chart of the control method of the pfc circuit of micro-compressor according to an embodiment of the invention.
In an embodiment of the present invention, pfc circuit includes inductance, diode and switching tube, and the input terminal of pfc circuit passes through Controllable switch is connected with DC power supply, and the output end of pfc circuit is connected with the input terminal of inverter circuit, the output end of inverter circuit It is connected with micro-compressor.Physical circuit can be refering to what is shown in Fig. 1, I will not elaborate.
As shown in Fig. 2, the control method of the pfc circuit of the micro-compressor the following steps are included:
S1, detects the DC bus-bar voltage of micro-compressor, and judges whether DC bus-bar voltage is less than predeterminated voltage threshold Value.
Specifically, DC bus-bar voltage can be detected using resistance sampling method.
S2, if DC bus-bar voltage is less than predetermined voltage threshold, by control controllable switch so that pfc circuit and straight Galvanic electricity source is connected, and output pwm signal to switching tube with by pfc circuit by the voltage of DC power supply be increased to first electricity Pressure, and first voltage is converted to by three-phase voltage by control inverter circuit, to power to micro-compressor.
Specifically, as shown in Figure 1, DC power supply carries out charging storage to inductance when the switching tube conducting in pfc circuit Can, the input voltage of inverter circuit will be maintained at DC bus-bar voltage;It is common by DC power supply and inductance when switching tube shutdown For inverter circuit power supply, then realize the promotion to input voltage, specifically boost number, by the triggering being applied on switching tube The duty ratio of pulse determines.Therefore, when the DC bus-bar voltage of detection is less than predetermined voltage threshold (for example, can be defeated for standard 80% entered) when, by control controllable switch so that pfc circuit is connected with DC power supply, while output pwm signal is to PFC DC bus-bar voltage is promoted to predetermined voltage threshold or more by the reasonable on-off of switch tube, at this time by the switching tube of circuit Controllable inverter circuit normal work is powered with exporting three-phase voltage to micro-compressor, allow micro-compressor after It is continuous to work normally.
Therefore, the control method of the pfc circuit of the micro-compressor of the embodiment of the present invention, in DC bus-bar voltage lower than pre- If when voltage threshold, controlling the tangential pfc circuit of controllable switch, and start pfc circuit work, input side power not only can be improved Factor, and DC bus-bar voltage can be promoted to by normal range (NR) by the reasonable on-off to switching tube in pfc circuit, significantly Resist under-voltage ability when enhancing micro-compressor low pressure operation, and expanded the range of input voltage, to effectively prevent Under undervoltage condition, directly avoided by cutting off the power caused by micro-compressor and component damage micro-compressor without Method continues the case where working normally.
According to one embodiment of present invention, if DC bus-bar voltage is more than or equal to predetermined voltage threshold, pass through control Controllable switch processed stops output pwm signal to switching tube, and direct by control inverter circuit so that pfc circuit is short-circuit It is three-phase voltage by the voltage inversion of DC power supply.
Specifically, DC power supply needs not move through when the DC bus-bar voltage of detection is more than or equal to predetermined voltage threshold Pfc circuit boosts, but is directly inputted into inverter circuit, into normal operating conditions, at this time can carry out pfc circuit short Road, while forbidding output pwm signal to switching tube.
Fig. 3 is the control method of pfc circuit in micro-compressor start-up course according to an embodiment of the invention.Such as figure Shown in 3, the control method the following steps are included:
S301, user power on, and pfc circuit is forbidden.
S302 judges DC bus-bar voltage VDC< predetermined voltage threshold VLIt is whether true.If so, executing step S303; If not, executing step S306.
S303, tangential pfc circuit, and control pfc circuit work.
S304 judges whether there is other failures.If so, executing step S305;If not, executing step S306.
S305, fault diagnosis are simultaneously handled.
S306, while meeting DC bus-bar voltage VDC>=predetermined voltage threshold VLAnd when without other failures, step is executed S307。
S307, micro-compressor starting.
S308, micro-compressor run well.
Specifically, by taking micro-compressor is applied in air conditioner as an example.User first powers on air conditioner, then root According to self-demand, the operating parameter of air conditioner is set by man-machine interface, external key or remote controler etc..Air conditioner is receiving To after operating parameter set by user, the target frequency of micro-compressor is given, and Mini compressed is detected by resistance sampling method Then the DC bus-bar voltage of machine is input to the mould of master controller by the DC bus-bar voltage that signal conditioning circuit etc. will test Number conversion module, converts analog signals into digital signal by analog-to-digital conversion module, to carry out data processing.
Master controller judges whether the DC bus-bar voltage of detection is less than predetermined voltage threshold, in the condition without other failures Under, if DC bus-bar voltage is less than predetermined voltage threshold, control the tangential pfc circuit of controllable switch, and opening to pfc circuit Close pipe and apply trigger pulse, wherein the duty ratio of trigger pulse according to the DC bus-bar voltage of detection and predetermined voltage threshold it Between difference and DC power supply voltage swing calculate obtain;Otherwise, without starting pfc circuit.
After starting pfc circuit, DC bus-bar voltage will be detected again and it will be judged.If DC bus-bar voltage More than or equal to predetermined voltage threshold, then reach the starting requirement of micro-compressor, control inverter circuit starting can be passed through at this time Micro-compressor, micro-compressor will enter normal operating phase after the links such as experience positioning, open loop and closed loop, and stablize At target frequency.Otherwise, illustrate that micro-compressor is not achieved starting and requires, need suitably to increase triggering according to the actual situation at this time The duty ratio of pulse, DC bus-bar voltage will further be promoted on the basis of before, be sentenced again to DC bus-bar voltage It is disconnected, it circuits sequentially, until DC bus-bar voltage is higher than predetermined voltage threshold, and until starting micro-compressor.
From DC bus-bar voltage utilization rate is improved, from the point of view of reducing harmonic content, in practical control process, use Vector control method controls micro-compressor, by sector where judging reference voltage vector, can be differed with the sector 60 ° of two basic vectors and zero vector carry out equivalent synthesized reference vector, and export the complementation of 6 tunnels using symmetrical seven segmentations SVPWM Pwm signal as trigger pulse, to control the turn-on and turn-off of 6 switching tubes in inverter circuit, so that micro-compressor obtains Obtain circular rotating magnetic linkage.
According to one embodiment of present invention, the control method of the pfc circuit of above-mentioned micro-compressor further include: judgement Whether micro-compressor is in the operation phase;If micro-compressor is in the operation phase, judging that DC bus-bar voltage is small When predetermined voltage threshold, first controls micro-compressor and shut down, then by control controllable switch so that pfc circuit and DC power supply It is connected.
Specifically, as shown in figure 4, the control method of pfc circuit includes following step when micro-compressor is in the operation phase It is rapid:
S401, micro-compressor are in the operation phase.
S402 judges DC bus-bar voltage VDC< predetermined voltage threshold VLIt is whether true.If so, executing step S403; If not, executing step S407.
S403, micro-compressor temporary stoppage.
S404, tangential pfc circuit, and control pfc circuit work.
S405 judges whether there is other failures.If so, executing step S406;If not, executing step S407.
S406, fault diagnosis are simultaneously handled.
S407, while meeting DC bus-bar voltage VDC>=predetermined voltage threshold VLAnd when without other failures, step is executed S408。
S408, micro-compressor restarting.
That is, the under-voltage operation of micro-compressor and under-voltage starting are similar, unlike, it is transported in micro-compressor During row, if DC bus-bar voltage is less than predetermined voltage threshold, need first to control micro-compressor shutdown, balance micro The air-breathing and pressure at expulsion of compressor are poor, and tangential pfc circuit, starting pfc circuit work, treatment process and Fig. 3 institute later Show that process is identical, in the case where there are not other failures, after short time interval, restarts micro-compressor, successively realize Micro-compressor is normally started and run.
The control method of the pfc circuit of micro-compressor according to an embodiment of the present invention, when DC bus-bar voltage is less than in advance If when voltage threshold, by control controllable switch so that pfc circuit is connected with DC power supply, and output pwm signal is extremely switched Pipe is to be increased to first voltage for the voltage of DC power supply by pfc circuit, and passes through control inverter circuit for first voltage Three-phase voltage is converted to, to power to micro-compressor.This method controls pfc circuit work under undervoltage condition, not only can be with Resist under-voltage ability when improving input side power factor, and significantly enhancing micro-compressor low pressure operation, and has expanded defeated Enter the range of voltage.
In addition, the embodiment of the present invention also proposed a kind of air conditioner comprising the control system of above-mentioned micro-compressor System.
The air conditioner of the embodiment of the present invention is controlled under undervoltage condition by the control system of above-mentioned micro-compressor Pfc circuit work, it is anti-when input side power factor not only can be improved, but also significantly enhancing micro-compressor low pressure operation Under-voltage ability, and the range of input voltage has been expanded, micro-compressor reliability of operation is improved, and then improve air conditioner Reliability.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral;It can be mechanical connect It connects, is also possible to be electrically connected;It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims (8)

1. a kind of control system of micro-compressor characterized by comprising
Controllable switch, the first end of the controllable switch are connected with one end of DC power supply;
Pfc circuit, the pfc circuit include inductance, diode and switching tube, the first input end of the pfc circuit with it is described The second end of controllable switch is connected, and the second input terminal of the pfc circuit is connected with the other end of the DC power supply;
Inverter circuit, the first output end and the controllable switch of the first input end of the inverter circuit and the pfc circuit Third end be respectively connected with, the second input terminal of the inverter circuit is connected with the second output terminal of the pfc circuit;
Voltage detection unit, for detecting the DC bus-bar voltage of the micro-compressor;
Control unit, described control unit are connected with the controllable switch, the switching tube and the inverter circuit respectively, are used for Controlled when the DC bus-bar voltage is less than predetermined voltage threshold the controllable switch first end and the controllable switch Second end is connected, and output pwm signal to the switching tube with by the pfc circuit by the voltage liter of the DC power supply Up to first voltage, and the first voltage is converted into three-phase voltage by controlling the inverter circuit, to described micro- The power supply of type compressor, wherein the duty ratio of the pwm signal according to the DC bus-bar voltage and the predetermined voltage threshold it Between difference and the voltage swing of the DC power supply calculate and obtain, the controllable switch first end and described controllably open The second end of pass is connected, and after the output pwm signal to the switching tube, judges again DC bus-bar voltage, And when DC bus-bar voltage is less than the predetermined voltage threshold, increase output on the basis of before to the switching tube The duty ratio of pwm signal, again judges DC bus-bar voltage, circuits sequentially, until DC bus-bar voltage is higher than described Predetermined voltage threshold, and until starting the micro-compressor.
2. the control system of micro-compressor according to claim 1, which is characterized in that described control unit is also used to The DC bus-bar voltage controls the first end of the controllable switch and described controllable when being more than or equal to the predetermined voltage threshold The third end of switch is connected, and stops exporting the pwm signal to the switching tube, and by controlling the inverter circuit The voltage of the DC power supply is directly converted into the three-phase voltage.
3. the control system of micro-compressor according to claim 1 or 2, which is characterized in that further include: filter circuit, The filter circuit is electrolytic capacitor, and the electrolytic capacitor is connected in parallel between the input terminal of the inverter circuit.
4. the control system of micro-compressor according to claim 3, which is characterized in that the voltage of the DC power supply is 12V, 24V or 48V.
5. a kind of air conditioner, which is characterized in that the control including micro-compressor described according to claim 1 any one of -4 System.
6. a kind of control method of the pfc circuit of micro-compressor, which is characterized in that the pfc circuit includes inductance, diode And switching tube, the input terminal of the pfc circuit are connected by controllable switch with DC power supply, the output end of the pfc circuit and The input terminal of inverter circuit is connected, and the output end of the inverter circuit is connected with the micro-compressor, the method includes with Lower step:
The DC bus-bar voltage of the micro-compressor is detected, and judges whether the DC bus-bar voltage is less than predeterminated voltage threshold Value;
If the DC bus-bar voltage is less than the predetermined voltage threshold, by controlling the controllable switch so that described Pfc circuit is connected with the DC power supply, and output pwm signal to the switching tube with will be described by the pfc circuit The voltage of DC power supply is increased to first voltage, and the first voltage is converted to three-phase by controlling the inverter circuit Voltage, to power to the micro-compressor, wherein the duty ratio of the pwm signal is according to the DC bus-bar voltage and institute The voltage swing for stating the difference and the DC power supply between predetermined voltage threshold, which calculates, to be obtained, the of the controllable switch One end is connected with the second end of the controllable switch, and after the output pwm signal to the switching tube, again to direct current mother Line voltage judged, and when DC bus-bar voltage is less than the predetermined voltage threshold, increase on the basis of before described in The duty ratio of pwm signal, again judges DC bus-bar voltage, circuits sequentially, until DC bus-bar voltage is higher than described Predetermined voltage threshold, and until starting the micro-compressor.
7. the control method of the pfc circuit of micro-compressor according to claim 6, which is characterized in that if described straight It flows busbar voltage and is more than or equal to the predetermined voltage threshold, then by controlling the controllable switch so that the pfc circuit is short-circuit, And stop exporting the pwm signal to the switching tube, and by controlling the inverter circuit directly by the DC power supply Voltage inversion be the three-phase voltage.
8. the control method of the pfc circuit of micro-compressor according to claim 6 or 7, which is characterized in that further include:
Judge whether the micro-compressor is in the operation phase;
If the micro-compressor is in the operation phase, judging the DC bus-bar voltage less than the default electricity When pressing threshold value, first control the micro-compressor and shut down, then by control the controllable switch so that the pfc circuit with it is described DC power supply is connected.
CN201610512298.3A 2016-06-30 2016-06-30 The control method of the control system and pfc circuit of air conditioner and micro-compressor Active CN106208885B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610512298.3A CN106208885B (en) 2016-06-30 2016-06-30 The control method of the control system and pfc circuit of air conditioner and micro-compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610512298.3A CN106208885B (en) 2016-06-30 2016-06-30 The control method of the control system and pfc circuit of air conditioner and micro-compressor

Publications (2)

Publication Number Publication Date
CN106208885A CN106208885A (en) 2016-12-07
CN106208885B true CN106208885B (en) 2019-04-05

Family

ID=57463066

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610512298.3A Active CN106208885B (en) 2016-06-30 2016-06-30 The control method of the control system and pfc circuit of air conditioner and micro-compressor

Country Status (1)

Country Link
CN (1) CN106208885B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110244143A (en) * 2019-05-23 2019-09-17 格力电器(武汉)有限公司 Electric expansion valve detection system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109004883B (en) * 2018-09-04 2020-12-18 深圳市锐钜科技有限公司 Bus voltage low-voltage region control method of small-capacitance motor driving system
CN112019030A (en) * 2019-05-31 2020-12-01 广东美的制冷设备有限公司 Operation control method, device, circuit, household appliance and computer storage medium

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101714829A (en) * 2008-10-01 2010-05-26 弗莱克斯电子有限责任公司 Power factor correction circuit
JP2012090476A (en) * 2010-10-21 2012-05-10 Fujitsu Telecom Networks Ltd Power supply unit
CN104184126A (en) * 2014-09-03 2014-12-03 阳光电源股份有限公司 Rapid protection method and device for Boost circuit with by-pass switch
CN105337520A (en) * 2015-12-11 2016-02-17 珠海格力电器股份有限公司 Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance
CN105515354A (en) * 2016-01-22 2016-04-20 珠海格力节能环保制冷技术研究中心有限公司 Method, device and system for controlling compressor
CN205195587U (en) * 2015-12-11 2016-04-27 珠海格力电器股份有限公司 Grid -connected PV converter, photovoltaic power supply system and electrical apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101714829A (en) * 2008-10-01 2010-05-26 弗莱克斯电子有限责任公司 Power factor correction circuit
JP2012090476A (en) * 2010-10-21 2012-05-10 Fujitsu Telecom Networks Ltd Power supply unit
CN104184126A (en) * 2014-09-03 2014-12-03 阳光电源股份有限公司 Rapid protection method and device for Boost circuit with by-pass switch
CN105337520A (en) * 2015-12-11 2016-02-17 珠海格力电器股份有限公司 Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance
CN205195587U (en) * 2015-12-11 2016-04-27 珠海格力电器股份有限公司 Grid -connected PV converter, photovoltaic power supply system and electrical apparatus
CN105515354A (en) * 2016-01-22 2016-04-20 珠海格力节能环保制冷技术研究中心有限公司 Method, device and system for controlling compressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110244143A (en) * 2019-05-23 2019-09-17 格力电器(武汉)有限公司 Electric expansion valve detection system

Also Published As

Publication number Publication date
CN106208885A (en) 2016-12-07

Similar Documents

Publication Publication Date Title
CN106208885B (en) The control method of the control system and pfc circuit of air conditioner and micro-compressor
CN105337262A (en) Variable frequency air conditioner and over-current protective circuit of power factor correction (PFC) circuit
KR20120138787A (en) All-weather energy-saving method and device for refrigerator and all-weather energy-saving refrigerator
CN105024539B (en) The short time voltage of single phase alternating current power supply interrupts countermeasure and device
CN104073838B (en) A kind of portable water electrolysis hydrogen production circuit control system based on TL494
CN106385231A (en) MPPT control circuit based on improved H-bridge DC-DC topology
CN102916205A (en) Energy-controllable output device for fuel cell and control method
CN103414204B (en) Adopt the control method of dynamic voltage compensation wind generator system output reactive power
CN109450340A (en) Electric excitation biconvex electrode electric machine loss of excitation failure tolerant electricity generation system and its control method
CN106788038B (en) A kind of overvoltage protective system and over-voltage protection method of no electrolytic capacitor Dual-motors Driving device
CN103701191A (en) UPS (Uninterruptible Power Supply) and power supply method thereof
CN110112899A (en) Drive control circuit and air conditioner
CN105071648A (en) Coping method and device for voltage swell of power grid of air-conditioning system
CN104779694B (en) The uninterrupted high frequency switch power of high energy efficiency in ATM
CN202268710U (en) Energy-controllable output device for fuel battery
CN205691700U (en) Photovoltaic DC-to-AC converter aging testing system
CN107959458A (en) Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment
CN205563347U (en) Polarization power supply unit based on single chip microcomputer control
CN204513902U (en) A kind of frequency converter utilizing the break-make of temperature controller to control compressor operating
CN106787664A (en) Soft starting circuit
CN104734512A (en) Fuel battery DC/DC conversion device and control method thereof
CN106066435A (en) Photovoltaic DC-to-AC converter aging testing system
CN207518501U (en) Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment
CN109980770A (en) A kind of data center&#39;s air-conditioning emergency power system and control method
CN206623645U (en) A kind of on-board air conditioner integrated control system

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
GR01 Patent grant