CN106208885A - Air-conditioner and the control system of micro-compressor and the control method of pfc circuit - Google Patents
Air-conditioner and the control system of micro-compressor and the control method of pfc circuit Download PDFInfo
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- CN106208885A CN106208885A CN201610512298.3A CN201610512298A CN106208885A CN 106208885 A CN106208885 A CN 106208885A CN 201610512298 A CN201610512298 A CN 201610512298A CN 106208885 A CN106208885 A CN 106208885A
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- Prior art keywords
- voltage
- compressor
- micro
- pfc circuit
- gate
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a kind of air-conditioner and the control system of micro-compressor and the control method of pfc circuit, described control system includes: gate-controlled switch, and the first end of gate-controlled switch is connected with one end of DC source；Pfc circuit, the first input end of pfc circuit is connected with the second end of gate-controlled switch；Inverter circuit, the first input end of inverter circuit is respectively connected with the first outfan of pfc circuit and the 3rd end of gate-controlled switch；The DC bus-bar voltage of voltage detection unit detection micro-compressor；Control unit the first end and second end of control gate-controlled switch when DC bus-bar voltage is less than predetermined voltage threshold is connected, and output pwm signal to the switching tube of pfc circuit the voltage of DC source is increased to the first voltage by pfc circuit, and by controlling inverter circuit, the first voltage is converted to three-phase voltage to power to micro-compressor.This system is possible not only to improve input side power factor, and can improve anti-under-voltage ability and the input voltage range of system.
Description
Technical field
The present invention relates to Compressor Technology field, particularly to control system, a kind of miniature pressure of a kind of micro-compressor
The control method of PFC (Power Factor Correction, the PFC) circuit of contracting machine and a kind of air-conditioner.
Background technology
Micro-compressor has that volume is little, lightweight, work is quiet, low almost without vibration, energy consumption, can be by battery, the sun
The advantage can powered with vehicle power etc., is widely used in the occasions such as air-conditioner, water cooling plant and mini refrigerating system, tool
There is preferable development prospect.
Due to application scenario and the restriction of condition, the controller of current micro-compressor typically uses the confession of low-voltage DC
Electrically, eliminate by industrial-frequency alternating current to galvanic conversion links, substantially reduce the volume and weight of controller, simultaneously
Also reduce cost.But the power factor of input side is the highest, and the scope of acceptable input voltage is less, Yi Shou electricity
, easily there is under-voltage grade for failure condition in source influence of fluctuations.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.
To this end, the first of the present invention purpose is to propose the control system of a kind of micro-compressor, this system is under-voltage
In the case of control pfc circuit work, be possible not only to improve input side power factor, and significantly enhance micro-compressor low pressure
Anti-under-voltage ability during operation, and expanded the scope 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 the control method of the pfc circuit of a kind of micro-compressor.
For achieving the above object, first aspect present invention embodiment proposes the control system of a kind of micro-compressor, bag
Including: gate-controlled switch, the first end of described gate-controlled switch is connected with one end of DC source；Pfc circuit, described pfc circuit includes
Inductance, diode and switching tube, the first input end of described pfc circuit is connected with the second end of described gate-controlled switch, described PFC
Second input of circuit is connected with the other end of described DC source；Inverter circuit, the first input end of described inverter circuit
Being respectively connected with the first outfan of described pfc circuit and the 3rd end of described gate-controlled switch, the second of described inverter circuit is defeated
Enter end to be connected with the second outfan of described pfc circuit；Voltage detection unit, female for detecting the direct current of described micro-compressor
Line voltage；Control unit, described control unit is connected with described gate-controlled switch, described switching tube and described inverter circuit respectively,
For controlling the first end of described gate-controlled switch when described DC bus-bar voltage is less than predetermined voltage threshold and described controlled opening
The second end closed is connected, and exports PWM (Pulse Width Modulation, pulse width modulation) signal to described switch
Pipe to be increased to the first voltage by described pfc circuit by the voltage of described DC source, and by controlling described inversion electricity
Described first voltage is converted to three-phase voltage by road, to power to described micro-compressor.
The control system of micro-compressor according to embodiments of the present invention, at DC bus-bar voltage less than predetermined voltage threshold
Time, control unit controls the first end of gate-controlled switch and is connected with the second end of gate-controlled switch, and output pwm signal is to switching tube
The voltage of DC source is increased to the first voltage by pfc circuit, and by controlling inverter circuit, the first voltage is turned
It is changed to three-phase voltage, to power to micro-compressor.This system controls pfc circuit work under undervoltage condition, is possible not only to carry
High input side power factor, and anti-under-voltage ability when significantly enhancing micro-compressor low pressure operation, and expanded input
The scope of voltage.
According to one embodiment of present invention, described control unit is additionally operable at described DC bus-bar voltage more than or equal to institute
3rd end of the first end and described gate-controlled switch that control described gate-controlled switch when stating predetermined voltage threshold is connected, and stops defeated
Go out described pwm signal extremely described switching tube, and directly the voltage of described DC source is turned by controlling described inverter circuit
It is changed to described three-phase voltage.
According to one embodiment of present invention, the control system of above-mentioned micro-compressor, also include: filter circuit, institute
Stating filter circuit is electrochemical capacitor, and described electrochemical capacitor is connected in parallel between the input of described inverter circuit.
According to one embodiment of present invention, the voltage of described DC source is 12V, 24V or 48V.
For achieving the above object, second aspect present invention embodiment proposes a kind of air-conditioner, and it includes above-mentioned miniature
The control system of compressor.
The air-conditioner of the embodiment of the present invention, by the control system of above-mentioned micro-compressor, controls under undervoltage condition
Pfc circuit works, and is possible not only to improve input side power factor, and anti-when significantly enhancing micro-compressor low pressure operation
Under-voltage ability, and expanded the scope of input voltage, improve micro-compressor reliability of operation, and then improve air-conditioner
Reliability.
For achieving the above object, third aspect present invention embodiment proposes the control of pfc circuit of a kind of micro-compressor
Method processed, described pfc circuit includes inductance, diode and switching tube, and the input of described pfc circuit passes through gate-controlled switch with straight
Stream power supply is connected, and the outfan of described pfc circuit is connected with the input of inverter circuit, the outfan of described inverter circuit and institute
State micro-compressor to be connected, said method comprising the steps of: detect the DC bus-bar voltage of described micro-compressor, and judge
Whether described DC bus-bar voltage is less than predetermined voltage threshold；If described DC bus-bar voltage is less than described predeterminated voltage threshold
Value, then by the described gate-controlled switch of control so that described pfc circuit is connected with described DC source, and output pwm signal is extremely
Described switching tube to be increased to the first voltage by described pfc circuit by the voltage of described DC source, and by controlling institute
State inverter circuit and described first voltage is converted to three-phase voltage, to power to described micro-compressor.
The control method of the pfc circuit of micro-compressor according to embodiments of the present invention, when DC bus-bar voltage is less than pre-
If during voltage threshold, by control gate-controlled switch so that pfc circuit is connected with DC source, and output pwm signal is to switch
Pipe to be increased to the first voltage by pfc circuit by the voltage of DC source, and by controlling inverter circuit by the first voltage
Be converted to three-phase voltage, to power to micro-compressor.The method controls pfc circuit work under undervoltage condition, is possible not only to
Raising input side power factor, and anti-under-voltage ability when significantly enhancing micro-compressor low pressure operation, and expanded defeated
Enter the scope of voltage.
According to one embodiment of present invention, if described DC bus-bar voltage is more than or equal to described predetermined voltage threshold,
Then by the described gate-controlled switch of control so that described pfc circuit is short-circuit, and stop exporting described pwm signal extremely described switching tube,
And be directly described three-phase voltage by the voltage inversion of described DC source by controlling described inverter circuit.
According to one embodiment of present invention, the control method of the pfc circuit of above-mentioned micro-compressor, also include: sentence
Whether disconnected described micro-compressor is in the operation phase；If described micro-compressor is in the described operation phase, then judging
When described DC bus-bar voltage is less than described predetermined voltage threshold, first controls described micro-compressor and shut down, then by controlling institute
State gate-controlled switch so that described pfc circuit is connected with described DC source.
Accompanying drawing explanation
Fig. 1 is the structural representation 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
The control method of pfc circuit when Fig. 4 is that micro-compressor is in the operation phase according to an embodiment of the invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the PFC of the control system of the micro-compressor of the embodiment of the present invention, micro-compressor is described
The control method of circuit and air-conditioner.
Fig. 1 is the structural representation of the control system of micro-compressor according to an embodiment of the invention.Such as Fig. 1 institute
Showing, the control system of this micro-compressor includes: gate-controlled switch 10, pfc circuit 20, inverter circuit 30, voltage detection unit (figure
In not specifically illustrated) and control unit 40.
Wherein, the first end of gate-controlled switch 10 is connected with one end of DC source VCC.Pfc circuit 20 include inductance L, two
Pole pipe D and switching tube Q, the first input end of pfc circuit 20 is connected with the second end of gate-controlled switch 10, the second of pfc circuit 20
Input is connected with the other end of DC source VCC.The first input end of inverter circuit 30 and the first outfan of pfc circuit 20
It is respectively connected with the 3rd end of gate-controlled switch 10, the second outfan phase of the second input of inverter circuit 30 and pfc circuit 20
Even.
In an embodiment of the present invention, the voltage of DC source VCC can be 12V, 24V or 48V, DC source VCC
Can be without arranging rectification link.
Voltage detection unit is for detecting the DC bus-bar voltage of micro-compressor.It is for instance possible to use electric resistance partial pressure method
Detection DC bus-bar voltage.Control unit 40 is connected with gate-controlled switch 10, switching tube Q and inverter circuit 30 respectively, for directly
Stream busbar voltage is connected with the second end of gate-controlled switch 10 less than the first end controlling gate-controlled switch 10 during predetermined voltage threshold,
And output pwm signal to switching tube Q the voltage of DC source VCC is increased to the first voltage, Yi Jitong by pfc circuit 20
Cross control inverter circuit 30 and first voltage is converted to three-phase voltage, to power to micro-compressor.Wherein, predetermined voltage threshold
Can demarcate according to practical situation.
Specifically, when the switching tube Q in pfc circuit 20 turns on, DC source VCC is charged energy storage to inductance L, inverse
The input voltage on power transformation road 30 will be maintained at DC bus-bar voltage；When switching tube Q turns off, by DC source VCC and inductance L altogether
Be all inverter circuit 30 to power, then realize the lifting to input voltage, concrete boosting number, by being applied on switching tube Q
Trigger pulse dutycycle determine.Therefore, it is less than predetermined voltage threshold (for example, it is possible to be when the DC bus-bar voltage of detection
The 80% of standard input) time, the second end of the first end and gate-controlled switch 10 that control unit 40 controls gate-controlled switch 10 is connected,
So that pfc circuit 20 is connected with DC source VCC, control unit 40 output pwm signal is to the switching tube of pfc circuit 20 simultaneously
Q, is promoted to more than predetermined voltage threshold by the reasonable break-make of switch tube Q by DC bus-bar voltage, now control unit 40
Inverter circuit 30 can be controlled normally work to export three-phase voltage and be powered to micro-compressor so that micro-compressor is permissible
Continue normal work.
Therefore, the control system of the micro-compressor of the embodiment of the present invention, at DC bus-bar voltage less than predeterminated voltage threshold
During value, control the tangential pfc circuit of gate-controlled switch, and start pfc circuit work, be possible not only to improve input side power factor, and
And by DC bus-bar voltage can be promoted to normal range by the reasonable break-make of pfc circuit breaker in middle pipe, significantly enhance
Anti-under-voltage ability during micro-compressor low pressure operation, and expanded the scope of input voltage, thus effectively prevent under-voltage
In the case of, directly avoid micro-compressor and component damage by cutting off the electricity supply and the micro-compressor that causes cannot continue
The situation of normal work.
According to one embodiment of present invention, control unit 40 is additionally operable at DC bus-bar voltage more than or equal to predeterminated voltage
The first end controlling gate-controlled switch 10 during threshold value is connected with the 3rd end of gate-controlled switch 10, and stops output pwm signal to opening
Close pipe Q, and directly the voltage of DC source VCC is converted to three-phase voltage by controlling inverter circuit 30.
Specifically, when the DC bus-bar voltage of detection is more than or equal to predetermined voltage threshold, DC source VCC is without warp
Cross pfc circuit to boost, but be directly inputted into inverter circuit 30, enter normal operating conditions, now can be by pfc circuit 20
The 3rd end carrying out the first end and gate-controlled switch 10 that short circuit, i.e. control unit 40 control gate-controlled switch 10 is connected, and prohibits simultaneously
Only output pwm signal is to switching tube Q.
According to one embodiment of present invention, as it is shown in figure 1, the control system of above-mentioned micro-compressor also includes: filter
Wave circuit, filter circuit is electrochemical capacitor EC, and electrochemical capacitor EC is connected in parallel between the input of inverter circuit 30.
Specifically, when DC bus-bar voltage is less than predetermined voltage threshold, it is tangential that control unit 40 controls gate-controlled switch 10
Pfc circuit 20, and start pfc circuit 20 and start working, after DC source VCC first passes through pfc circuit boosting, then by electrolysis electricity
Holding EC and filter higher hamonic wave to obtain galvanic current, input to inverter circuit 30 the most again, whole circuit enters under-voltage guarantor
Protect duty；When DC bus-bar voltage is higher than predetermined voltage threshold, control unit 40 controls gate-controlled switch 10 by pfc circuit
20 short circuits, forbid that output pwm signal needs not move through pfc circuit boost to switching tube Q, DC source simultaneously, but directly
Input is to inverter circuit 30.
It addition, in an embodiment of the present invention, control unit 40 uses vector control mode to control micro-compressor
System.During controlling, by the phase current of single resistor current sampling micro-compressor, and the phase current reconstruction according to sampling is micro-
The three-phase current of type compressor, then control unit 40 carries out coordinate transform and PI (Proportional to three-phase current
Integral, proportional integral) regulation etc., to obtain reference voltage vector amplitude and phase place, it is finally based on SVPWM (Space
Vector Pulse Width Modulation, space vector pulse width modulation) ultimate principle obtains vector and falls and fan in difference
Time in district, the conducting dutycycle of 6 switching tubes in inverter circuit 30, realizes the control to micro-compressor then.Single owing to controlling
The switching tube of inverter circuit and pfc circuit is controlled by unit simultaneously, significantly reduces PCB (Printed Circuit
Board, printed circuit board) space, thus the size of PCB can be effectively reduced and reduce cost.It is additionally, since the single electricity of employing
Resistance current sample mode reconstructs the three-phase current of micro-compressor, has not only abandoned traditional sensor current sampling, and has saved
Remove at least one sampling resistor, effectively saved the cost of components and parts, add the market competitiveness of control unit.
In sum, the control system of micro-compressor according to embodiments of the present invention, at DC bus-bar voltage less than pre-
If during voltage threshold, control unit controls the first end of gate-controlled switch and is connected with the second end of gate-controlled switch, and exports PWM letter
Number to switching tube the voltage of DC source is increased to the first voltage by pfc circuit, and will by controlling inverter circuit
First voltage is converted to three-phase voltage, to power to micro-compressor.This system controls pfc circuit work under undervoltage condition,
It is possible not only to improve input side power factor, and anti-under-voltage ability when significantly enhancing micro-compressor low pressure operation, and
Expand the scope of input voltage.And use single-chip control, and use single resistor current sample mode reconstruct Mini compressed
The three-phase current of machine, effectively reduces the usage quantity of components and parts, reduces the size of PCB, reduces cost, adds 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 of pfc circuit passes through
Gate-controlled switch is connected with DC source, and the outfan of pfc circuit is connected with the input of inverter circuit, the outfan of inverter circuit
It is connected with micro-compressor.Physical circuit is referred to shown in Fig. 1, and I will not elaborate.
As in figure 2 it is shown, the control method of the pfc circuit of this micro-compressor comprises the following steps:
S1, the DC bus-bar voltage of detection micro-compressor, and judge that whether DC bus-bar voltage is less than predeterminated voltage threshold
Value.
Specifically, resistance sampling method can be used to detect DC bus-bar voltage.
S2, if DC bus-bar voltage is less than predetermined voltage threshold, then by controlling gate-controlled switch so that pfc circuit is with straight
Stream power supply is connected, and output pwm signal to switching tube the voltage of DC source is increased to the first electricity by pfc circuit
Pressure, and the first voltage is converted to three-phase voltage, to power to micro-compressor by controlling inverter circuit.
Specifically, as it is shown in figure 1, when the switching tube in pfc circuit turns on, DC source is charged storage to inductance
Can, the input voltage of inverter circuit will be maintained at DC bus-bar voltage；When switching tube turns off, common by DC source and inductance
Power for inverter circuit, then realize the lifting to input voltage, concrete boosting number, by the triggering being applied on switching tube
The dutycycle of pulse determines.Therefore, it is less than predetermined voltage threshold (for example, it is possible to be that standard is defeated when the DC bus-bar voltage of detection
80% entered) time, by controlling gate-controlled switch so that pfc circuit is connected with DC source, output pwm signal is to PFC simultaneously
The switching tube of circuit, is promoted to more than predetermined voltage threshold by DC bus-bar voltage, now by the reasonable break-make of switch tube
Inverter circuit can be controlled normally work to export three-phase voltage and be powered to micro-compressor so that micro-compressor can continue
Continuous normal work.
Therefore, the control method of the pfc circuit of the micro-compressor of the embodiment of the present invention, at DC bus-bar voltage less than pre-
If during voltage threshold, control the tangential pfc circuit of gate-controlled switch, and start pfc circuit work, be possible not only to improve input side power
Factor, and by DC bus-bar voltage can be promoted to normal range, significantly by the reasonable break-make of pfc circuit breaker in middle pipe
Enhance anti-under-voltage ability during micro-compressor low pressure operation, and expanded the scope of input voltage, thus effectively prevent
Under undervoltage condition, directly avoid micro-compressor and component damage by cutting off the electricity supply and the micro-compressor that causes without
Method continues the situation of normal work.
According to one embodiment of present invention, if DC bus-bar voltage is more than or equal to predetermined voltage threshold, then by control
Gate-controlled switch processed is so that pfc circuit is short-circuit, and it is to switching tube and direct by controlling inverter circuit to stop output pwm signal
It is three-phase voltage by the voltage inversion of DC source.
Specifically, when the DC bus-bar voltage of detection is more than or equal to predetermined voltage threshold, DC source needs not move through
Pfc circuit boosts, but is directly inputted into inverter circuit, enters normal operating conditions, now can carry out short by pfc circuit
Road, forbids that output pwm signal is to switching tube simultaneously.
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, this control method comprises the following steps:
S301, user powers on, and pfc circuit is forbidden.
S302, it is judged that DC bus-bar voltage VDC＜ predetermined voltage threshold VLWhether set up.If it is, perform step S303；
If it does not, perform step S306.
S303, tangential pfc circuit, and control pfc circuit work.
S304, it may be judged whether have other faults.If it is, perform step S305；If it does not, perform step S306.
S305, fault diagnosis also processes.
S306, meets DC bus-bar voltage V simultaneouslyDC>=predetermined voltage threshold VLAnd during without other faults, perform step
S307。
S307, micro-compressor starts.
S308, micro-compressor runs well.
Specifically, as a example by micro-compressor is applied in air-conditioner.Air-conditioner is first powered on by user, then root
According to self-demand, set the operational factor of air-conditioner by man machine interface, external button or remote controller etc..Air-conditioner is receiving
After the operational factor that user sets, the target frequency of given micro-compressor, and detect Mini compressed by resistance sampling method
The DC bus-bar voltage of machine, then inputs the mould to master controller by signal conditioning circuit etc. by the DC bus-bar voltage of detection
Number conversion module, converts analog signals into digital signal by analog-to-digital conversion module, in order to carry out data process.
Master controller judges whether the DC bus-bar voltage of detection is less than predetermined voltage threshold, in the condition without other faults
Under, if DC bus-bar voltage is less than predetermined voltage threshold, then controls the tangential pfc circuit of gate-controlled switch, and give opening of pfc circuit
Close pipe and apply to trigger pulse, wherein, trigger the dutycycle of pulse according to DC bus-bar voltage and the predetermined voltage threshold of detection it
Between difference and DC source voltage swing calculate obtain；Otherwise, it is not necessary to start pfc circuit.
After starting pfc circuit, will again detect DC bus-bar voltage and it will be judged.If DC bus-bar voltage
More than or equal to predetermined voltage threshold, then reach the startup requirement of micro-compressor, now can start by controlling inverter circuit
Micro-compressor, experience is positioned, enters normal operating phase after the link such as open loop and closed loop by micro-compressor, and stable exists
At target frequency.Otherwise, illustrate that micro-compressor does not reaches startup requirement, now need suitably to increase according to practical situation triggering
The dutycycle of pulse, DC bus-bar voltage will promote further on the basis of before, again sentence DC bus-bar voltage
Disconnected, circulate successively, until DC bus-bar voltage is higher than predetermined voltage threshold, and till starting micro-compressor.
From improving DC bus-bar voltage utilization rate, from the point of view of reducing harmonic content, during actual control, use
Micro-compressor is controlled by vector control method, by judging sector, reference voltage vector place, and this sector available difference
Two basic vectors of 60 ° and zero vector carry out equivalent synthesized reference vector, and it is complementary to use symmetrical seven segmentation SVPWM to export 6 tunnels
Pwm signal as trigger pulse, 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 also includes: judge
Whether micro-compressor is in the operation phase；If micro-compressor is in the operation phase, then judging that DC bus-bar voltage is little
When predetermined voltage threshold, first control micro-compressor and shut down, then by controlling gate-controlled switch so that pfc circuit and DC source
It is connected.
Specifically, as shown in Figure 4, when micro-compressor is in the operation phase, the control method of pfc circuit includes following step
Rapid:
S401, micro-compressor is in the operation phase.
S402, it is judged that DC bus-bar voltage VDC＜ predetermined voltage threshold VLWhether set up.If it is, perform step S403；
If it does not, perform step S407.
S403, micro-compressor temporary stoppage.
S404, tangential pfc circuit, and control pfc circuit work.
S405, it may be judged whether have other faults.If it is, perform step S406；If it does not, perform step S407.
S406, fault diagnosis also processes.
S407, meets DC bus-bar voltage V simultaneouslyDC>=predetermined voltage threshold VLAnd during without other faults, perform step
S408。
S408, micro-compressor restarts.
It is to say, the under-voltage operation of micro-compressor and under-voltage startup are similar, except for the difference that, transport at micro-compressor
During row, if DC bus-bar voltage is less than predetermined voltage threshold, then needs first to control micro-compressor and shut down, balance micro
Air-breathing and the pressure at expulsion of compressor are poor, and tangential pfc circuit, start pfc circuit work, processing procedure afterwards and Fig. 3 institute
Show that flow process is identical, in the case of occurring without other faults, after short time interval, restart micro-compressor, realize successively
The normal of micro-compressor starts and runs.
The control method of the pfc circuit of micro-compressor according to embodiments of the present invention, when DC bus-bar voltage is less than pre-
If during voltage threshold, by control gate-controlled switch so that pfc circuit is connected with DC source, and output pwm signal is to switch
Pipe to be increased to the first voltage by pfc circuit by the voltage of DC source, and by controlling inverter circuit by the first voltage
Be converted to three-phase voltage, to power to micro-compressor.The method controls pfc circuit work under undervoltage condition, is possible not only to
Raising input side power factor, and anti-under-voltage ability when significantly enhancing micro-compressor low pressure operation, and expanded defeated
Enter the scope of voltage.
Additionally, embodiments of the invention also proposed a kind of air-conditioner, it includes the control system of above-mentioned micro-compressor
System.
The air-conditioner of the embodiment of the present invention, by the control system of above-mentioned micro-compressor, controls under undervoltage condition
Pfc circuit works, and is possible not only to improve input side power factor, and anti-when significantly enhancing micro-compressor low pressure operation
Under-voltage ability, and expanded the scope of input voltage, improve micro-compressor reliability of operation, and then improve air-conditioner
Reliability.
In describing the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include at least one this feature.In describing the invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
One or more embodiments or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification.
Claims (8)
1. the control system of a micro-compressor, it is characterised in that including:
Gate-controlled switch, the first end of described gate-controlled switch is connected with one end of DC source；
Pfc circuit, described pfc circuit includes inductance, diode and switching tube, and the first input end of described pfc circuit is with described
Second end of gate-controlled switch is connected, and the second input of described pfc circuit is connected with the other end of described DC source；
First outfan of inverter circuit, the first input end of described inverter circuit and described pfc circuit and described gate-controlled switch
The 3rd end be respectively connected with, the second input of described inverter circuit is connected with the second outfan of described pfc circuit；
Voltage detection unit, for detecting the DC bus-bar voltage of described micro-compressor；
Control unit, described control unit is connected with described gate-controlled switch, described switching tube and described inverter circuit respectively, is used for
The first end of described gate-controlled switch and described gate-controlled switch is controlled when described DC bus-bar voltage is less than predetermined voltage threshold
Second end is connected, and output pwm signal to described switching tube with by described pfc circuit by the voltage liter of described DC source
Up to first voltage, and described first voltage is converted to three-phase voltage, with to described micro-by controlling described inverter circuit
Type compressor is powered.
The control system of micro-compressor the most according to claim 1, it is characterised in that described control unit is additionally operable to
The first end of described gate-controlled switch and described controlled is controlled when described DC bus-bar voltage is more than or equal to described predetermined voltage threshold
3rd end of switch is connected, and stops exporting described pwm signal extremely described switching tube, and by controlling described inverter circuit
Directly the voltage of described DC source is converted to described three-phase voltage.
The control system of micro-compressor the most according to claim 1 and 2, it is characterised in that also include: filter circuit,
Described filter circuit is electrochemical capacitor, and described electrochemical capacitor is connected in parallel between the input of described inverter circuit.
The control system of micro-compressor the most according to claim 3, it is characterised in that the voltage of described DC source is
12V, 24V or 48V.
5. an air-conditioner, it is characterised in that include the control according to the micro-compressor according to any one of claim 1-4
System.
6. the control method of the pfc circuit of a micro-compressor, it is characterised in that described pfc circuit includes inductance, diode
And switching tube, the input of described pfc circuit is connected with DC source by gate-controlled switch, the outfan of described pfc circuit and
The input of inverter circuit be connected, the outfan of described inverter circuit is connected with described micro-compressor, described method include with
Lower step:
Detect the DC bus-bar voltage of described micro-compressor, and judge that whether described DC bus-bar voltage is less than predeterminated voltage threshold
Value；
If described DC bus-bar voltage is less than described predetermined voltage threshold, then by controlling described gate-controlled switch so that described
Pfc circuit is connected with described DC source, and output pwm signal to described switching tube with by described pfc circuit by described
The voltage of DC source is increased to the first voltage, and by controlling described inverter circuit, described first voltage is converted to three-phase
Voltage, to power to described micro-compressor.
The control method of the pfc circuit of micro-compressor the most according to claim 6, it is characterised in that if described directly
Stream busbar voltage is more than or equal to described predetermined voltage threshold, then by the described gate-controlled switch of control so that described pfc circuit is short-circuit,
And stop exporting described pwm signal extremely described switching tube, and by controlling described inverter circuit directly by described DC source
Voltage inversion be described three-phase voltage.
8. according to the control method of the pfc circuit of the micro-compressor described in claim 6 or 7, it is characterised in that also include:
Judge whether described micro-compressor is in the operation phase；
If described micro-compressor is in the described operation phase, then judging that described DC bus-bar voltage is less than described default electricity
During pressure threshold value, first control described micro-compressor and shut down, then by controlling described gate-controlled switch so that described pfc circuit is with described
DC source is connected.
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| 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 |
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| CN112524854A (en) * | 2020-12-09 | 2021-03-19 | 青岛海尔空调器有限总公司 | Control method of compressor in variable frequency air conditioner and variable frequency air conditioner |
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| CN112803748A (en) * | 2021-01-29 | 2021-05-14 | 上海瞻芯电子科技有限公司 | Fixed feedforward control method for power factor correction circuit |
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