CN109494966A - Integral type screw compressor and its method, apparatus of frequency converter power consumption reduction - Google Patents
Integral type screw compressor and its method, apparatus of frequency converter power consumption reduction Download PDFInfo
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- CN109494966A CN109494966A CN201811419442.4A CN201811419442A CN109494966A CN 109494966 A CN109494966 A CN 109494966A CN 201811419442 A CN201811419442 A CN 201811419442A CN 109494966 A CN109494966 A CN 109494966A
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- power tube
- bridge power
- frequency converter
- circuit board
- synchronous rectification
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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
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1422—Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames
- H05K7/1427—Housings
- H05K7/1432—Housings specially adapted for power drive units or power converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
-
- 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
-
- 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
- H02M1/0054—Transistor switching losses
-
- 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)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of integral type screw compressor and its method, apparatus of frequency converter power consumption reduction, the compressor includes shell, frequency converter and motor, the frequency converter and motor are arranged in shell, the frequency converter includes circuit board, three phase full bridge power tube and three torsion spring terminals, the three phase full bridge power tube is encapsulated in the front of circuit board, front insertion of three torsion spring terminals from circuit board, and stretched out from the back side of circuit board, three torsion spring terminals are directed at connection with the three-phase binding post of motor.The present invention can make the frequency converter of integral type screw compressor play good heat dissipation effect, and by way of duty ratio control and offline self study synchronous rectification control, reduce the frequency converter own power loss of integral type screw compressor, even if guarantee increases the refrigeration work consumption of compressor, the power tube temperature of frequency converter is still in safe range.
Description
Technical field
The present invention relates to a kind of integral type screw compressor and its method, apparatus of frequency converter power consumption reduction, belong to automobile-used
The frequency converter of air-conditioning screw compressor radiates and power consumption reduces field.
Background technique
Integrated car air-conditioning electric scroll compressor refer to scroll compressor, drive compressor permanent magnet synchronous motor,
The frequency converter of control motor is all mounted in a compact aluminium casing.24V frequency converter refers to be supplied using 24V battery DC
The frequency converter of electricity.The refrigeration work consumption of car air-conditioner is bigger than general domestic air conditioning, but the small an order of magnitude of supply voltage, leads
Cause its driving current more order of magnitude greater than normal domestic use air-conditioning.It is a kind of low with the matched frequency converter of 24V scroll compressor
Press high-current circuit.
When using the power supply of 24V battery, the driving motor of screw compressor is generally used DC brushless motor (BLDC), right
The driving circuit answered use three phase full bridge, and using power field effect pipe (MOSFET) be used as power switch component, power tube by
Single-chip microcontroller is controlled using pulse width modulation (Pulse Width Modulation, abbreviation PWM) mode.It is limited to compressor
The board area of shelling machine, corresponding integrated variable frequency device is less than 12cm*12cm, this is a kind of high power density structure.
When air-conditioning work normally when, frequency converter itself also to consume part input electric energy, this power loss mainly by
Power tube causes, and the power loss of power tube itself is eventually converted into the form of heat, and driving circuit is caused to generate heat.Power tube it is total
Power loss WTIt is represented by WT=WC+WS+WD, wherein WCIt is conduction loss, i.e., electric current flows through its internal electricity when power tube is opened
The caused power loss of resistance；WSIt is switching loss, i.e., power tube becomes open procedure by opening change pass or by closing, since electric current can not dash forward
Become caused loss；WDIt is afterflow loss, i.e., when the upper bridge power tube or lower bridge power of a bridge arm in three phase full bridge circuit
When pipe turns off, the freewheeling diode in antithesis power tube in an off state is caused to be connected, electric current passes through produced by diode
Loss.This three parts loss changes with the working condition of drive motor for compressor, with pulse width modulation duty ratio at
Positive correlation, i.e., as compressor work power increases, pulse width modulated duty cycle is also increased with it, three kinds of power losses
All increase, but its changing rule is complicated non-linear relation.Driving power needed for obvious motor becomes larger, the function of driving circuit
Rate loss also increases with it.
Vehicular electric scroll compressor have pursue the maximized trend of refrigeration work consumption, i.e., holding compressor housing it is constant,
Compressor scroll plate mechanical structure is constant, only improves refrigerating capacity by improving driving motor rated power.Obvious refrigerating capacity is got over
Greatly, the power loss of frequency converter also increases, so reducing power driving circuit power loss, suitably radiates to power circuit,
It is the key that improve air conditioner power, and guarantee the key of frequency converter reliability, power field effect pipe works in superheat state
It is easy to damage.
Reducing driving circuit fever can be from reduction conduction loss (WC), switching loss (WS), afterflow be lost (WD) three aspects
Hand.WCRelated with operating current and power tube internal resistance, after power tube model determines, this partition losses has just determined substantially, difficult
To reduce again；WSIt is related with the switching speed of PWM carrier frequency and power tube, after the preamplifying circuit of power tube determines,
Its switching speed is just fixed, is only left by reducing this approach for reducing WS of carrier frequency, but carrier frequency influences motor control
Performance processed can not arbitrarily reduce；WDIt is related with the diode forward pressure drop that freewheel current is flowed through, if afterflow road can be changed
Diameter is possible to reduce afterflow loss.
It is inevitable by the caused fever of frequency converter own power loss, so frequency converter must have suitable dissipate
Hot approach guarantees that under various extreme operating conditions, the temperature of power tube is in safe range.
Summary of the invention
The first purpose of this invention is to provide a kind of integral type screw compressor, which can be such that frequency converter rises
To good heat dissipation effect.
Second object of the present invention is to provide a kind of method of the frequency converter power consumption reduction of integral type screw compressor,
This method reduces the change of integral type screw compressor in such a way that duty ratio controls and offline self study synchronous rectification controls
The loss of frequency device own power, even if guaranteeing to increase the refrigeration work consumption of compressor, the power tube temperature of frequency converter is still in safe model
In enclosing.
Third object of the present invention is to provide a kind of device of the frequency converter power consumption reduction of integral type screw compressor.
The first purpose of this invention can be reached by adopting the following technical scheme that:
Integral type screw compressor, including shell, frequency converter and motor, the frequency converter and motor are arranged in shell,
The frequency converter includes circuit board, three phase full bridge power tube and three torsion spring terminals, and the three phase full bridge power tube is encapsulated in electricity
The front of road plate, three torsion spring terminals are inserted into from the front of circuit board, and are stretched out from the back side of circuit board, three torsional spring ends
Son is directed at connection with the three-phase binding post of motor.
Further, the shell includes box cover and pedestal, and the motor is arranged in pedestal, the back side of the circuit board
Intermediate region is equipped with silicagel pad, and circuit board is pressed and is detachably connected in silicagel pad, and with pedestal by the box cover, box cover and bottom
The accommodating chamber for placing frequency converter is formed between seat.
Further, the pedestal has boss terrace, and the circuit board and silicagel pad are placed on together on boss terrace；
The three phase full bridge power tube includes bridge power tube under bridge power tube on three groups and three groups, bridge power on described three groups
The drain solder of pipe is densely covered with multiple metals on the positive DC bus of circuit board on the positive DC bus of circuit board
Change via hole, is sprayed with one layer of exposed tin on the DC bus of the back of circuit board；Bridge power tube is welded on electricity under described three groups
Road plate front, and it is located at the side of three torsion spring terminals, the drain electrode of bridge power tube is through the positive copper foil conducting wire of circuit board under three groups
It connects one to one with three torsion spring terminals.
Further, bridge power tube is made of two power tube parallel connections on every group, and bridge power tube is by two power under every group
Pipe parallel connection is constituted.
Second object of the present invention can be reached by adopting the following technical scheme that:
The method of the frequency converter power consumption reduction of integral type screw compressor, which comprises
The duty ratio of pulse width modulation is controlled, the switching loss of upper bridge power tube in three phase full bridge power tube is reduced；
Offline self study synchronous rectification control reduces the afterflow loss of all power tubes in three phase full bridge power tube；
By reducing in the switching loss of upper bridge power tube in three phase full bridge power tube, and reduction three phase full bridge power tube
The afterflow of all power tubes is lost, to reduce transducer power loss.
Further, the duty ratio of the control pulse width modulation reduces upper bridge power tube in three phase full bridge power tube
Switching loss, specifically:
When air-conditioning is in heavy load condition, if pulse width modulation duty ratio in the section of (98%, 100%),
Duty ratio is then increased to 100%, the upper bridge power tube that would operate in pulse switch state becomes forcing to continue opening state, simultaneously
Speed feedback control is exited, is changed to force time phase change control, keeps motor speed constant, opening for bridge power tube is greatly decreased
Number is closed, that is, reduces switching loss caused by upper bridge power tube.
Further, the offline self study synchronous rectification control, reduces all power tubes in three phase full bridge power tube
Afterflow loss, specifically:
Learnt respectively under the conditions of the operating current of different motors and operating voltage according to the back emf waveform of motor
Record only by upper bridge power tube internal diode afterflow when the first time of afterflow and only pass through two poles of lower bridge power tube inside
The second time of afterflow when pipe afterflow；Using the first time of afterflow and the second time of afterflow as synchronous rectification pulse it is lasting when
Between, synchronous rectification control is divided into upper bridge power tube synchronous rectification control and lower bridge power tube synchronous rectification controls two kinds of operating conditions.
Further, the upper bridge power tube synchronous rectification control, specifically:
Instantly when bridge power tube becomes closed state from opening state, postpone a dead time, open the upper bridge of antithesis
Power tube, freewheel current are changed to flow out from the source electrode of upper bridge power tube through drain electrode, open the duration, i.e. the synchronous rectification time.
Further, the lower bridge power tube synchronous rectification control, specifically:
After the upper bridge power tube pulse-off that the last one pulse width is modulated in pulse width modulation period, delay
One dead time opens the lower bridge power tube of antithesis, and freewheel current is changed to by flowing in the drain electrode of lower bridge power tube and source electrode
It crosses, opens the duration, is i.e. the synchronous rectification time.
Third object of the present invention can be reached by adopting the following technical scheme that:
The device of the frequency converter power consumption reduction of integral type screw compressor, described device include:
Duty cycle control module reduces upper bridge in three phase full bridge power tube for controlling the duty ratio of pulse width modulation
The switching loss of power tube；
Synchronous rectification control module is controlled for offline self study synchronous rectification, reduces in three phase full bridge power tube and owns
The afterflow of power tube is lost；
Transducer power loss reduces module, for the switch damage by reducing upper bridge power tube in three phase full bridge power tube
Consumption, and reduce the afterflow loss of all power tubes in three phase full bridge power tube, to reduce transducer power loss.
The present invention have compared with the existing technology it is following the utility model has the advantages that
1, three torsion spring terminals are inserted by integral type screw compressor of the invention from the front of circuit board, and from circuit board
The back side stretch out, three torsion spring terminals are directed at connection with the three-phase binding post of motor, can be by the heat on three torsion spring terminals
On conduction to the three-phase binding post of motor, heat dissipation effect is played.
2, the back of circuit board intermediate region of frequency converter is equipped with silicagel pad in integral type screw compressor of the invention, passes through
Box cover is pressed the circuit board of frequency converter in silicagel pad, it is possible to reduce vibration caused by motor operating is to first on circuit board
The vibratory impulse of device, to improve the freedom from vibration of frequency converter.
3, in integral type screw compressor of the invention on three groups of frequency converter the drain solder of bridge power tube in circuit board
On positive DC bus, multiple metallization VIAs are densely covered on the positive DC bus of circuit board, when upper bridge power tube works,
Heat caused by the power loss of its own is conducted by the metallization VIA on the DC bus of circuit board front to circuit board
One layer of exposed tin is sprayed on the DC bus at the back side, and on the DC bus of back of circuit board, since DC bus is copper
Material, exposed copper-tin alloy face are contacted with silicagel pad, to conducting the heat that upper bridge power tube generates through silicagel pad to low
On the boss terrace of temperature, radiated with this to upper bridge power tube.
4, in integral type screw compressor of the invention under three groups of frequency converter the drain electrode of bridge power tube by circuit board just
Copper foil conducting wire and the torsion spring terminal in face connect one to one, and in the work of lower bridge power tube, copper foil conducting wire can be by lower bridge power
It manages heat caused by the power loss of itself to be transmitted on the torsion spring terminal of low temperature, be radiated with this to lower bridge power tube.
5, the present invention can reduce integral type by way of duty ratio control and offline self study synchronous rectification control
The frequency converter own power of screw compressor is lost, even if guaranteeing to increase the refrigeration work consumption of compressor, the power tube of frequency converter
Temperature is still in safe range.
6, the present invention, if not applying control, flows through the electric current of the power tube in the shutdown of some power tube of lower bridge originally, by
With the diode continuousing flow in the upper bridge power tube of its antithesis, and zero is gradually decayed to, during this afterflow, opens the upper of antithesis
Bridge power tube, freewheel current is changed to flow through the source electrode and drain electrode of bridge power tube, since power tube internal resistance is small, to significantly subtract
Small afterflow loss；Upper bridge group power shutdown when, if not applying control, flow through the electric current of the group power originally, by with
Diode continuousing flow in the lower bridge power tube of its antithesis, gradually decays to zero, during this afterflow, opens the lower bridge function of antithesis
Rate pipe, freewheel current are changed to flow through in the source electrode and drain electrode by lower bridge power tube, the internal resistance very little of power tube, to be greatly reduced
Afterflow loss；Both control modes are referred to as synchronous rectification, by the back emf waveform of motor during measurement afterflow, strictly
Control three phase full bridge power tube opens moment and duration, in order to avoid motor normal control is caused to disturb.It is whole by synchronizing
Flow control reduces the afterflow loss of three phase full bridge power tube.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in embodiment will be made below
Simply introduce, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the plane structure chart of the integral type screw compressor of the embodiment of the present invention 1.
Fig. 2 is the A-A cross-sectional view of Fig. 1.
Fig. 3 is the decomposition chart of the integral type screw compressor of the embodiment of the present invention 1.
Fig. 4 is the top view of the circuit board component layout of the frequency converter of the embodiment of the present invention 1.
Fig. 5 is the side view of the circuit board component layout of the frequency converter of the embodiment of the present invention 1.
Fig. 6 is the three phase full bridge power transistor circuits schematic diagram of the embodiment of the present invention 1.
Fig. 7 is the three phase full bridge power tube heat dissipation design figure of the embodiment of the present invention 1.
Fig. 8 is the method flow diagram of the frequency converter power consumption reduction of the integral type screw compressor of the embodiment of the present invention 2.
Fig. 9 is the duty ratio control flow chart that the pulse width of the embodiment of the present invention 2 is modulated.
Figure 10 is the freewheel current and back emf waveform relational graph of the embodiment of the present invention 2.
Figure 11 is the synchronous rectification control sequential figure of the embodiment of the present invention 2.
Figure 12 is the apparatus structure block diagram of the frequency converter power consumption reduction of the integral type screw compressor of the embodiment of the present invention 3.
In FIG. 1 to FIG. 5,1- shell, 101- box cover, 102- pedestal, 1021- boss terrace, 103- accommodating chamber, 2- frequency conversion
Device, 201- circuit board, 2011- copper bar, 202- torsion spring terminal, 203- silicagel pad, the upper bridge power tube of 204-, bridge power under 205-
Pipe, 3- three-phase binding post.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1:
As shown in FIG. 1 to 3, present embodiments provide a kind of integral type screw compressor, the compressor include shell 1,
Frequency converter 2 and motor, frequency converter 2 and motor are arranged in shell 1, and motor has three-phase binding post 3, and three-phase refers to U phase, V phase
With W phase, explanation is not repeated below.
The shell 1 includes box cover 101 and pedestal 102, and motor is arranged in pedestal 102, and box cover 101 and pedestal 101 can
Dismantling connection, and form the accommodating chamber 103 for placing frequency converter 2, the space size of accommodating chamber 103 with box cover 101 size
And change.
As shown in fig. 1~fig. 5, the frequency converter 2 is 24V frequency converter comprising circuit board 201, three phase full bridge power tube
With three torsion spring terminals 202, single-chip microcontroller and copper bar 2011 are integrated on circuit board 201, which has a diversion function, and three
Phase full bridge power pipe is encapsulated in the front of circuit board 201, and three torsion spring terminals 202 are from the front insertion of circuit board 201, and from electricity
The back side of road plate 201 is stretched out, and three torsion spring terminals 202 are directed at connection with the three-phase binding post 3 of motor, and specifically, three are turned round
Three torsion spring terminals 202 are directly pressed into motor by pressing mode to the three-phase binding post 3 of alignment motor by spring terminal 202
On three-phase binding post 3, specifically, the three-phase binding post 3 of motor is most of to be immersed in the air-conditioning refrigerant of low temperature, outside fraction
Dew, exposed parts are inserted into inside torsion spring terminal 202, contact, make inside torsion spring terminal 202 with the inner tight of torsion spring terminal 202
Torsional spring automatically with the three-phase binding post 3 of motor lock, be also able to maintain Maximum Contact area under vibration, it is ensured that Ke Yiliu
Super-high-current, to realize that the high current of frequency converter 2 and motor is electrically connected, while can be by the heat on three torsion spring terminals 202
In amount conduction to the three-phase binding post 3 of motor, heat dissipation effect is played；Wherein, torsion spring terminal 202 and three-phase binding post 3 are gold
Belong to material.
In order to reduce the vibratory impulse vibrated caused by motor operating to component on circuit board 201, the present embodiment
101 back side intermediate region of circuit board is equipped with silicagel pad 203, which has thermally conductive function, and has elasticity, passes through
Circuit board 201 is pressed in silicagel pad 203 by box cover 101, the freedom from vibration of frequency converter 2 can be improved, due to circuit board 201
On the metal heat sink that does not add additionally, so that frequency converter 2 is mounted in accommodating chamber 103, therefore need to only use lesser
Box cover 101 is mountable frequency converter 2；In addition, pedestal 102 has boss terrace 1021, circuit board 201 and silicagel pad 203 are together
It is placed on boss terrace 1021.
The three phase full bridge power tube includes bridge under bridge power tube on three groups (upper half-bridge power field effect pipe) 204 and three groups
Power tube (lower half-bridge power field effect pipe) 205, as shown in FIG. 1 to FIG. 7, on three groups bridge power tube 204 be respectively S1, S3 and
S5 in order to improve rated current capacity, and reduces conducting internal resistance, and S1, S3, S5 are really by MOSFET power tube structure in parallel two-by-two
At bridge power tube is respectively S2, S4 and S6 under three groups, in order to improve rated current capacity, and reduces conducting internal resistance, S2, S4, S6
Really by MOSFET power tube, parallel connection is constituted two-by-two, and MOSFET power tube uses the packing forms of TO-263-7, in conjunction with Fig. 4,
The bottom surface of MOSFET power tube is metal block, while being also the drain electrode of MOSFET power tube, bridge power tube 204 on three groups
MOSFET power tube drain solder is densely covered on the DC bus on 201 positive DC bus (positive wire) of circuit board
Multiple metallization VIAs, on three groups when the MOSFET power tube work of bridge power tube 204, caused by the power loss of its own
Heat is conducted by the metallization VIA on 201 front DC bus of circuit board to the DC bus at 201 back side of circuit board, electricity
The DC bus at 201 back side of road plate does not spray welding resistance paint, but sprayed on the DC bus at 201 back side of circuit board one layer it is exposed
Tin, due to DC bus be copper material, exposed copper-tin alloy face is contacted with silicagel pad 203, thus by upper bridge power tube 204
The heat of generation is conducted through silicagel pad 203 to the boss terrace 1021 of low temperature, is radiated with this to upper bridge power tube 204.
The back side of 205 place circuit board 201 of bridge power tube does not have corresponding silicagel pad 202, therefore lower bridge power under three groups
Pipe 205 drain electrode reality is exactly the three-phase output end of frequency converter, as shown in FIG. 1 to FIG. 7, bridge power tube is welded on circuit under three groups
201 front of plate, and it is located at the side of three torsion spring terminals 202, the drain electrode of bridge power tube 205 is passing through circuit board 201 just under three groups
The short and thick copper foil conducting wire in face connects one to one with torsion spring terminal 202, which is to be shorted, these copper foils short and wide
On the one hand conducting wire can flow through high current, can be by lower bridge power tube 205 certainly on the other hand when lower bridge power tube 205 works
Heat caused by the power loss of body is transmitted on the torsion spring terminal 202 of low temperature, is carried out with this to lower bridge power tube 204 scattered
Heat, since the torsional spring inside torsion spring terminal 202 is locked with the three-phase binding post 3 of motor automatically, torsion spring terminal 202 and motor
Three-phase binding post 3 also function as the radiator of lower bridge power tube 205 simultaneously.
Embodiment 2:
As shown in figure 8, the method for present embodiments providing a kind of frequency converter power consumption reduction of integral type screw compressor, it should
Method mainly passes through the chip microcontroller of frequency converter, comprising the following steps:
The duty ratio that S801, control pulse width are modulated reduces the switch damage of upper bridge power tube in three phase full bridge power tube
Consumption.
For the motor of integral type screw compressor, using 120 degree of PWM-ON control modes, i.e., upper bridge power tube work exists
The pulse width modulation of quick on-off, to adjust the size of current of motor, the single-chip microcontroller of frequency converter passes through measuring and calculating motor
Actual speed adjusts the duty ratio size of pulse width modulation using the revolving speed of motor as feedback signal, by indirectly controlling motor
Electric current control the revolving speed of motor, as air conditioner load aggravates, the pulse of the single-chip microcontroller control output in frequency-variable controller is wide
The duty ratio (DC) of degree modulation increases with it, and maximum can be to 100%；As shown in figure 9, when air-conditioning is in heavy load condition, if
When the duty ratio of pulse width modulation is less than 98%, using speed feedback control mode, if the duty ratio of pulse width modulation exists
In the section of (98%, 100%), indicate that motor is in heavy duty state, operating current is larger, and pulse width modulation is become
For ON-OFF mode, the duty ratio request artificially increased at this time to single-chip microcontroller input, single-chip microcontroller responds the request, increases duty ratio
To 100%, the upper bridge power tube that would operate in pulse switch state becomes forcing to continue opening state, while exiting speed feedback
Control is changed to force time phase change control by scm software, keeps motor speed constant, bridge power tube is greatly decreased
On-off times reduce switching loss caused by upper bridge power tube, in forcing time phase change control process, monitoring motor is anti-
Electromotive force zero passage phase angle, judge motor whether ovennodulation (duty ratio is too big), phase angle in safe range, just maintain duty
Than it is constant be 100%, when phase angle, reflection is ovennodulation, then exits and force time phase change control mode, and duty ratio is arranged
It is 97.8%, and returns to normal speed feedback control.
S802, offline self study synchronous rectification control reduce the afterflow loss of all power tubes in three phase full bridge power tube.
It as shown in Figure 10, is the electric current of motor U phase and back emf waveform figure, 1. place finds out Cong Tuzhong, when upper bridge power
Pipe shutdown, when diode continuousing flow in the lower bridge power tube of antithesis, U phase back-emf is close to zero, and the state duration is as 3.
It is shown；Find out from figure 2., bridge power tube turns off under bridge instantly, and when diode continuousing flow on antithesis in bridge power tube, U is opposite
3. EMF voltage is meant that synchronous close to DC bus-bar voltage, the state duration as shown in 4. with the width of 4. pulse
The pulse width of rectification, synchronous rectification herein refer to when the diode in power tube has freewheel current to flow through, while giving the power
Pulse is opened in the gate pole application of pipe, makes power tube by Guan Biankai, and freewheel current is changed to the source electrode flow direction drain electrode by power tube, electric current
It is more much smaller than the loss that electric current flows through diode to flow through power loss caused by power tube internal resistance, so that afterflow damage be greatly reduced
Consumption.Afterflow pulse width changes with motor working current and cell voltage.In order to accurately implement synchronous rectification control, pass through experiment
Observation, first when upper bridge power tube internal diode afterflow when first recording different motor working currents, operating voltage are continuous
Stream timetable MAP1 (I, BATT), the second time of afterflow table MAP2 (I, BATT) when lower bridge power tube internal diode afterflow,
With reference table application.
As shown in figure 11, it is synchronous rectification control sequential figure, is divided into bridge synchronous rectification and lower two kinds of works of bridge synchronous rectification
Condition.Specific synchronous rectification control is by real to enhanced pulse width modulation (ePWM) the control module programming inside single-chip microcontroller
Existing, upper bridge synchronous rectification control is indicated by tri- events of A, B, C of Figure 11.Indicate that pulse width modulator counter reaches arteries and veins at A
Width modulation period (120 degree of periods) event is rushed, which triggers scm software interrupt task A_TASK, interrupts in A_TASK
Afterflow pulse width data is updated according to MAP1 (I, BATT) in service routine；The value of pulse width modulator counter is indicated at B
With the value similar events of pwm comparator, which turns off upper bridge power tube；
After postponing a dead time, since at C, the power tube for controlling lower bridge synchronous rectification is open-minded, realizes synchronous rectification；Lower bridge
Synchronous rectification control is indicated by tri- events of D, E, F in Figure 11, indicates that pulse width modulator counter is decremented to zero at D, should
Event triggers scm software interrupt task D_TASK, interrupts in service in D_TASK and updates afterflow arteries and veins according to MAP2 (I, BATT)
Rush width；Indicate that the value similar events of pulse width modulator counter and pwm comparator, the event trigger arteries and veins at E
It rushes width modulation controller and turns off lower bridge power tube；After postponing a dead time, since at F, bridge synchronizes whole in control
The power tube of stream is open-minded, realizes synchronous rectification；By the way that synchronous rectification is opened moment and service time control in optimum range
It is interior, avoid the normal control of synchronous rectification interference motor.
S803, the switching loss by reducing upper bridge power tube in three phase full bridge power tube, and reduce three phase full bridge function
The afterflow loss of all power tubes in rate pipe, to reduce transducer power loss.
It will be understood by those skilled in the art that journey can be passed through by implementing the method for the above embodiments
Sequence is completed to instruct relevant hardware, and corresponding program can store in computer readable storage medium, storage medium can
To be disk, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory
The media such as (RAM, Random Access Memory), USB flash disk, mobile hard disk.
Embodiment 3:
As shown in figure 12, a kind of device of the frequency converter power consumption reduction of integral type screw compressor is present embodiments provided,
The device includes that duty cycle control module 1201, synchronous rectification control module 1202 and transducer power loss reduce module
1203, the concrete function of modules is as follows:
The duty cycle control module 1201 reduces three phase full bridge power for controlling the duty ratio of pulse width modulation
The switching loss of upper bridge power tube in pipe.
The synchronous rectification control module 1202 is controlled for offline self study synchronous rectification, reduces three phase full bridge power
The afterflow loss of all power tubes in pipe.
The transducer power loss reduces module 1203, for by reducing upper bridge power tube in three phase full bridge power tube
Switching loss, and reduce three phase full bridge power tube in all power tubes afterflow loss, thus reduce transducer power damage
Consumption.
The specific implementation of above-mentioned module is referring to above-described embodiment 2, and this is no longer going to repeat them；It should be noted that above-mentioned
The device that embodiment provides only the example of the division of the above functional modules, in practical applications, can be according to need
It wants and is completed by different functional modules above-mentioned function distribution, i.e., internal structure is divided into different functional modules, with complete
At all or part of function described above.
In conclusion the present invention can make the frequency converter of integral type screw compressor play good heat dissipation effect, and
By way of duty ratio control and offline self study synchronous rectification control, reduce the frequency converter of integral type screw compressor certainly
Body power loss, even if guaranteeing to increase the refrigeration work consumption of compressor, the power tube temperature of frequency converter is still in safe range.
The above, only the invention patent preferred embodiment, but the scope of protection of the patent of the present invention is not limited to
This, anyone skilled in the art is in the range disclosed in the invention patent, according to the present invention the skill of patent
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the scope of protection of the patent of the present invention.
Claims (10)
1. integral type screw compressor, including shell, frequency converter and motor, the frequency converter and motor are arranged in shell,
It is characterized in that, the frequency converter includes circuit board, three phase full bridge power tube and three torsion spring terminals, the three phase full bridge power tube
It is encapsulated in the front of circuit board, three torsion spring terminals are inserted into from the front of circuit board, and are stretched out from the back side of circuit board, three
A torsion spring terminal is directed at connection with the three-phase binding post of motor.
2. integral type screw compressor according to claim 1, which is characterized in that the shell includes box cover and pedestal,
The motor is arranged in pedestal, and the back side intermediate region of the circuit board is equipped with silicagel pad, and the box cover presses circuit board
It is detachably connected in silicagel pad, and with pedestal, forms the accommodating chamber for placing frequency converter between box cover and pedestal.
3. integral type screw compressor according to claim 2, which is characterized in that the pedestal has boss terrace, institute
Circuit board and silicagel pad is stated to be placed on together on boss terrace；
The three phase full bridge power tube includes bridge power tube under bridge power tube on three groups and three groups, bridge power tube on described three groups
Drain solder is densely covered with multiple metallized on the positive DC bus of circuit board on the positive DC bus of circuit board
Hole is sprayed with one layer of exposed tin on the DC bus of the back of circuit board；Bridge power tube is welded on circuit board under described three groups
Front, and it is located at the side of three torsion spring terminals, the drain electrode of bridge power tube is through the positive copper foil conducting wire of circuit board and three under three groups
A torsion spring terminal connects one to one.
4. integral type screw compressor according to claim 3, which is characterized in that bridge power tube is by two power on every group
Pipe parallel connection is constituted, and bridge power tube is made of two power tube parallel connections under every group.
5. the method for the frequency converter power consumption reduction of integral type screw compressor, which is characterized in that the described method includes:
The duty ratio of pulse width modulation is controlled, the switching loss of upper bridge power tube in three phase full bridge power tube is reduced；
Offline self study synchronous rectification control reduces the afterflow loss of all power tubes in three phase full bridge power tube；
Own by reducing in the switching loss of upper bridge power tube in three phase full bridge power tube, and reduction three phase full bridge power tube
The afterflow of power tube is lost, to reduce transducer power loss.
6. according to the method described in claim 5, it is characterized in that, the duty ratio of the control pulse width modulation, reduces three
The switching loss of upper bridge power tube in phase full bridge power pipe, specifically:
When air-conditioning is in heavy load condition, if pulse width modulation duty ratio in the section of (98%, 100%), then plus
To 100%, the upper bridge power tube that would operate in pulse switch state becomes forcing to continue opening state big space rate, exits simultaneously
Speed feedback control is changed to force time phase change control, keeps motor speed constant, the switch of bridge power tube is greatly decreased
Number reduces switching loss caused by upper bridge power tube.
7. according to the method described in claim 5, it is characterized in that, the offline self study synchronous rectification control, reduces three-phase
The afterflow loss of all power tubes in full bridge power pipe, specifically:
According to the back emf waveform of motor, under the conditions of the operating current of different motors and operating voltage, difference learning records
The first time of afterflow when only by upper bridge power tube internal diode afterflow and only continuous by lower bridge power tube internal diode
The second time of afterflow when stream；It, will using the first time of afterflow and the second time of afterflow as the duration of synchronous rectification pulse
Synchronous rectification control is divided into bridge power tube synchronous rectification control and lower bridge power tube synchronous rectification controls two kinds of operating conditions.
8. the method according to the description of claim 7 is characterized in that upper bridge power tube synchronous rectification control, specifically:
Instantly when bridge power tube becomes closed state from opening state, postpone a dead time, open the upper bridge power of antithesis
Pipe, freewheel current are changed to flow out from the source electrode of upper bridge power tube through drain electrode, open the duration, i.e. the synchronous rectification time.
9. the method according to the description of claim 7 is characterized in that lower bridge power tube synchronous rectification control, specifically:
After the upper bridge power tube pulse-off that the last one pulse width is modulated in pulse width modulation period, postpone one
Dead time opens the lower bridge power tube of antithesis, and freewheel current is changed to be opened by flowing through in the drain electrode of lower bridge power tube and source electrode
Logical duration, i.e. synchronous rectification time.
10. the device of the frequency converter power consumption reduction of integral type screw compressor, which is characterized in that described device includes:
Duty cycle control module reduces upper bridge power in three phase full bridge power tube for controlling the duty ratio of pulse width modulation
The switching loss of pipe；
Synchronous rectification control module is controlled for offline self study synchronous rectification, reduces all power in three phase full bridge power tube
The afterflow of pipe is lost；
Transducer power loss reduces module, for passing through the switching loss for reducing upper bridge power tube in three phase full bridge power tube,
And reduce the afterflow loss of all power tubes in three phase full bridge power tube, to reduce transducer power loss.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910793948.XA CN110445352B (en) | 2018-11-26 | 2018-11-26 | Method and device for reducing power consumption of frequency converter of integrated scroll compressor |
| CN201811419442.4A CN109494966B (en) | 2018-11-26 | 2018-11-26 | Integrated scroll compressor and method and device for reducing power consumption of frequency converter of integrated scroll compressor |
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| CN201811419442.4A CN109494966B (en) | 2018-11-26 | 2018-11-26 | Integrated scroll compressor and method and device for reducing power consumption of frequency converter of integrated scroll compressor |
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| CN203272094U (en) * | 2012-12-14 | 2013-11-06 | 上海三电贝洱汽车空调有限公司 | Controller of motor compressor |
| JP2017073445A (en) * | 2015-10-06 | 2017-04-13 | 株式会社豊田自動織機 | Power conversion device |
| CN107842501A (en) * | 2016-09-21 | 2018-03-27 | 比亚迪股份有限公司 | Compressor |
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| US6597157B1 (en) * | 2001-07-25 | 2003-07-22 | 3Dlabs, Inc., Ltd | Parallel phased switch control |
| TWI313102B (en) * | 2005-02-21 | 2009-08-01 | Delta Electronics Inc | Llc series resonant converter and the driving method of the synchronous rectifier power switches thereof |
| CN102588273B (en) * | 2011-01-13 | 2015-04-01 | 上海日立电器有限公司 | Integrated electric compressor assembly used for automotive air conditioner |
| CN103095193B (en) * | 2013-01-16 | 2015-07-29 | 南京航空航天大学 | A kind of drive system being applied to brshless DC motor |
| CN105703546A (en) * | 2014-11-28 | 2016-06-22 | 上海狮虎能源科技股份有限公司 | Variable-frequency fuel generator |
| CN106817012B (en) * | 2015-11-30 | 2018-12-07 | 强弦科技股份有限公司 | Power control and power control method |
| CN107666243B (en) * | 2017-11-13 | 2023-08-15 | 重庆中科芯亿达电子有限公司 | Self-excitation synchronous rectification power supply circuit |
| CN108448898B (en) * | 2018-03-29 | 2019-10-11 | 合肥工业大学 | LLC based on phase shifting angle feedforward is without sensor synchronous rectification control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203272094U (en) * | 2012-12-14 | 2013-11-06 | 上海三电贝洱汽车空调有限公司 | Controller of motor compressor |
| JP2017073445A (en) * | 2015-10-06 | 2017-04-13 | 株式会社豊田自動織機 | Power conversion device |
| CN107842501A (en) * | 2016-09-21 | 2018-03-27 | 比亚迪股份有限公司 | Compressor |
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| CN110445352A (en) | 2019-11-12 |
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