CN105874702B - Power-converting device - Google Patents
Power-converting device Download PDFInfo
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- CN105874702B CN105874702B CN201580003687.7A CN201580003687A CN105874702B CN 105874702 B CN105874702 B CN 105874702B CN 201580003687 A CN201580003687 A CN 201580003687A CN 105874702 B CN105874702 B CN 105874702B
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- voltage
- filter condenser
- relay
- setting value
- inverter
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
Resistor configuration is between transformer and the circuit of filter condenser, and for preventing surge current, the contact point of the resistor and relay is arranged in parallel.Then, when the voltage of filter condenser rises and is more than specified value, control method makes relay do shutoff operation；When the voltage of filter condenser declines and is less than specified value, control method makes relay do opening operation.In order to make the electric current for flowing through the transformer be no more than the maximum allowed current of the transformer, the setting value is higher than the minimum amount of voltage that of the filter condenser.
Description
Technical field
The embodiment of the present invention is related to power-converting device, and the voltage of AC power is changed by the power converter apparatus
Direct current, in the alternating voltage that the DC voltage is changed into assigned frequency.
Background technology
Power-converting device includes rectification circuit, filter condenser and inverter.Rectification circuit is by commercial ac power source
Voltage is changed into direct current；The output voltage of the rectification circuit is filtered by filter condenser；Inverter is by filter capacitor
The voltage of device is changed into the alternating voltage of assigned frequency.PTC heat is configured between commercial ac power source and the power cord of rectification circuit
Quick resistance (a kind of resistor, with temperature rise, resistance also will increase).PTC thermistor is for preventing surge current.PTC
Thermistor is arranged in parallel with relay contacts point.
In the power-converting device, relay contacts point is opened in advance, PTC thermistor is made to participate in power-on circuit.
In this way, being capable of surge current after power supply opening.
Then, as the voltage of filter condenser rises, do not have to worry surge current.Relay contacts point is closed at this time
It closes, keeps PTC thermistor short-circuit, PTC thermistor disconnects.When the voltage of commercial current and power supply temporarily reduces, filter condenser
Voltage when being less than the output voltage of rectification circuit, open relay contacts point, make PTC thermistor participates in being powered again it is electric
Road, you can prevent surge current.
【Prior art document】
【Patent document】
【Patent document 1】Japanese patent application discloses No. 2011-182568.
Invention content
【The problem of invention intends to solve】
In above-mentioned power-converting device, the electric current that power cord flows through is larger, and when semiconductor switch either on or off
The relay for will produce power loss, therefore having put into PTC thermistor and can having detached.However, relay is believed according to electric power
Number mechanical change contact point action has prolonging for several msec times from electric power signal is received to the actually opened closing of contact point
Late.Because of the time delay, it may not be possible to prevent surge current.
The purpose of embodiments of the invention is to provide a kind of power-converting device, the power-converting device can be certainly
Prevent surge current.
【The mode solved the problems, such as】
The power-converting device of claim 1 includes transformer, filter condenser, inverter, resistor, relay and control
Means processed.The voltage transformation of commercial ac power source is direct current by the transformer；The filter condenser and the transformer
Output end connects；The voltage of the filter condenser is changed into alternating voltage by the inverter, and the alternating voltage after transformation is made
It is exported to load for driving power；Electricity of the resistor configuration between the transformer and the power-on circuit of the filter condenser
Road prevents surge current；Relay is connect with the capacitor in parallel, and is contained and had point of contact；The electricity of the filter condenser
When pressure rises to specified value or more, control means make the relay make closing motion, and the voltage of the filter condenser is less than
When setting value, control means make the relay make opening action.In order to make the electric current for flowing through the transformer be no more than transformation
The maximum current limit value of device, the setting value are higher than the minimum amount of voltage that of the filter condenser.
Description of the drawings
Fig. 1 is module map, it is shown that the composition of each embodiment.
Fig. 2 is flow chart, it is shown that the control method of the 1st embodiment.
Fig. 3 is flow chart, it is shown that the change of the voltage change, relay drive signal of filter condenser in the 1st embodiment
Change the variation with normally opened contact point.
Fig. 4 is flow chart, it is shown that the control method of the 2nd embodiment.
Fig. 5 is flow chart, it is shown that the change of the voltage change, relay drive signal of filter condenser in the 2nd embodiment
Change the variation with normally opened contact point.
Fig. 6 is flow chart, it is shown that the control method of the 3rd embodiment.
Fig. 7 is flow chart, it is shown that the change of the voltage change, relay drive signal of filter condenser in the 3rd embodiment
Change the variation with normally opened contact point.
Fig. 8 is flow chart, it is shown that the control method of the 4th embodiment.
【Symbol description】
1 ... three-phase alternating-current supply, 2 ... transformers, 3 ... prevent the resistor (machine of load surface) of surge current, 4 ... filters
Wave capacitor, 10 ... inverters, M ... brushless DC motors (load), 11,12,13 ... current inductors, 20 ... main control units,
21 ... voltage detecting elements, 22 ... NPN transistors, 30 ... relays, 30a ... relay contacts point, 50 ... non-inductive vectors
Control unit.
Specific implementation mode
The embodiment of the present invention 1 is illustrated referring to figure.
As shown in Figure 1, transformer 2 connects commercial three-phase alternating-current supply 1.Transformer 2 contains multiple switch element and multiple
The alternating voltage of commercial three-phase alternating-current supply 1 is converted to DC voltage by diode.The output end of the transformer 2 passes through electricity
The parallel circuit for hindering device 3 and relay contacts point 30a, connect with filter condenser (electrolytic capacitor) 4.Resistor 3 is PTC heat
Quick resistance, for preventing surge current.Relay contacts point 30a is the normally opened contact point of relay 30.
Then, inverter 10 is connect with filter condenser 4, brushless DC motor (also known as permanent magnet synchronous motor) M conducts
Load is connect with the output end of inverter 10.Inverter 10 contains switch element T1, T2, T3, T4, T5 and T6.Two switch members
Part T1, T2 form U-shaped series circuit, and reflux diode is connected in inverse parallel with T1, T2 respectively；Two switch element T3, T4 shapes
Forming V-shape series circuit, reflux diode are connected in inverse parallel with T3, T4 respectively；Two switch elements T5, T6 form the series connection of W rows
Circuit, reflux diode are connected in inverse parallel with T5, T6 respectively；Voltage is changed into the exchange of assigned frequency by filter condenser 4
Voltage, the alternating voltage after transformation are exported to brushless DC motor M, the driving power as brushless DC motor M.Brushless DC
Phase spiral Lu, Lv, Lw of motor M contacts with each other a little with two switch elements in each series circuit of the inverter 10 respectively
Connection.
By the collector emitter of NPN transistor 22, DC voltage Vd is applied to above-mentioned relay 30.NPN type is brilliant
The base portion of body pipe 22 is connect with main control unit 20.When main control unit 20 provides high-level relay drive signal, NPN type driving
Device 22 is opened, and when main control unit 20 provides low-level relay drive signal, NPN type driver 22 is closed.NPN transistor
When 22 opening, the magnetizing coil of relay 30 is powered, and relay contacts point 30a is closed.That is, relay 30 is to close to move
Make.When NPN transistor 22 is closed, the magnetizing coil no power of relay 30, relay contacts point 30a is opened.That is,
Relay 30 is opening action.
The both ends connection voltage detecting element 21 of above-mentioned filter condenser 4.Voltage detecting element 21 detects the filter capacitor
The voltage Vdc that device 4 generates.The voltage detecting element 21 is connect with master controller 20.
Each electrified wire configuration current inductor (electricity between the output end and brushless DC motor M of above-mentioned inverter 10
Convertor transformer) 11,12,13.Current inductor 11,12,13 detects phase spiral Lu, Lv, the Lw for flowing through brushless DC motor M respectively
Electric current (phase current).These current inductors 11,12,13 are connect with main control unit 20.
Main control unit 20 is also connect with ensorless control portion 50.Contain electricity in ensorless control portion 50
Detecting element 51, speed estimating operational part 52, integration part 53, subtraction portion 54, speed controlling portion 55, operational part 56, subtraction portion 57 are flowed,
58, current control unit (the 1st current control unit) 61, current control unit (the 2nd current control unit) 62 and PWM signal generation section.
The detection electric current of current inductor 11,12,13 is 2 phases from 3 phase transition by electric current detecting element 51, calculates nothing respectively
Magnetic field axis (d axis) coordinate on brushless DC motor M examination paper axis and torque axis (q axis) coordinate detect that magnetic field components electric current (is known as
D shaft currents) 1d and torque component electric current (q shaft currents) 1q.Speed estimating operational part 52 is detected based on electric current detecting element 51
Magnetic field components electric current 1d and torque component electric current 1q carries out the rotor speed omega est that brushless DC motor M is inferred in operation.Specifically
For, the magnetic field components voltage Vd and electric current that are acquired using magnetic field components electric current 1d, torque component electric current 1q, current control unit 61
The magnetic field components voltage Vq that control unit 62 acquires carries out operation, infers that magnetic field components speed power generation power is (again in brushless DC motor M
Referred to as d axle speeds electricity) Ed, ratio, integration control (PI controls) operation based on the d axle speeds electricity Ed, deduction
Rotor speed omega est.
Integration part 53 integrates the deduction rotor speed omega est that speed estimating operational part 52 obtains, and obtains deduction and turns
Sub- position θ est.The deduction rotor position est is provided to current detecting part 51 and PWM signal generation section 63.Subtraction portion 54
Target velocity ω ref that main control unit 20 is transmitted and rotor speed omega est subtractions, obtain target velocity ω ref and
Infer the velocity deviation between rotor speed omega ref.The velocity deviation that speed controlling portion 55 obtains subtraction portion 54 carry out ratio,
Integration control (PI controls) operation obtains the desired value Iqref of torque component electric current Iq.Operational part 56 is from torque component electric current Iq
Desired value Iqref calculating magnetic field ingredient electric currents Id desired value Idref.Subtraction portion 57 is by desired value Idref and magnetic field components
Electric current Id subtracts, and obtains the deviation delta Id between desired value Idref and magnetic field components electric current Id.Operational part 58 is by desired value
IqRef subtracts with torque component electric current Iq, obtains the deviation delta Iq between desired value Iqref and torque component electric current Iq.
Ratio of the current control unit 61 according to deviation delta Id, integration control (PI controls) operation, will be in brushless DC motor M
D axial coordinates conversion on armature spindle, obtains magnetic field components voltage Vd.Current control unit 62 is according to the ratio of deviation delta Iq, integral
(PI controls) operation is controlled, the q axial coordinates in brushless DC motor M on armature spindle are converted, magnetic field components voltage Vq is obtained.
PWM signal generation section gives birth to inverter 10 according to magnetic field part voltage Vd, torque component voltage Vq and presumption rotor position est
At pulse-amplitude modulation signal (also known as pwm signal).The pwm signal makes the switch element T1-T6 of inverter 10 play on or off
It closes, driving voltage Vu, Vv, Vw is generated from inverter 10, export to phase spiral Lu, Lv, Lw of brushless DC electronics M.Then, energy
The speed of enough M of control brushless DC motor in a short time reaches target velocity.
Main control unit 20 plays main function by the method for following (1)-(3).
(1) when the voltage of filter condenser 4 (the detection voltage of voltage detecting element 21) Vdc rises and is higher than specified value V2
When, the 1st control means make relay generate closing motion, close relay contacts point 30a.
(2) payload does not arrive designated value (light load), and the voltage Vdc of filter condenser 4, which declines and is less than, to be preset
The 1st setting value V1 ' (s <When V2), the 2nd control means make relay 30 generate opening action, open relay contacts point 30a.
Since the 1st setting value V1 ' is less than specified value V2, in order to make the electric current for flowing through transformer 2 allow maximum electricity no more than transformer 2
Stream, the 1st setting value V1 ' need the minimum amount of voltage that V1 higher than filter condenser 4.The maximum current of allowing of transformer 2 is transformation
The maximum rated current of switch element or diode in device 2.
(3) payload is more than designated value (middle load or heavy load), and the voltage Vdc of filter condenser 4 declines and is less than
2nd setting value (is higher than above-mentioned 1st setting value V1 '), and the 3rd control means make relay 30 generate opening action, opens relay
Contact point 30a.2nd setting value uses specified value V2.The 2nd setting value is set as specified value symbol " V2 " below.
In the following, being illustrated to the control mode of main control unit 20 with reference to the flow chart of Fig. 2 and the time diagram of Fig. 3.
If using commercial three-phase alternating-current supply 1, the voltage of the commercialization three-phase alternating-current supply 1 is changed by transformer 2
For DC voltage Va.The DC voltage Va is applied to filter condenser 4.After filter condenser 4 is applied in voltage, voltage
Vdc rises.
When the power supply input, the difference between transformer 2 output voltage Va and the voltage Vdc of filter condenser 4 is " Va-
Vdc " is Z from commercial three-phase alternating-current supply 1 to the line impedance of filter condenser 4, then show that surge current is Ix=(Va-
Vdc)/Z.Surge current flows to filter condenser 4 from transformer 2.But when between 4 circuit of transformer 2 and filter condenser
Relay contacts point 30a open, when resistor 3 is put into, the electric current actually flowed through changes.Electric current is Iy=at this time
(Va-Vdc)/(Z+R).The electric current Iy values allow maximum current no more than transformer 2.In such manner, it is possible to prevent transformer 2
Switch element and diode be destroyed.
When the voltage Vdc of filter condenser 4 rises (YES of step S1), main control unit 20 is by the voltage of filter condenser 4
Vdc is compared with specified value (the=the 2 setting value) V2 (step S2).Then, when voltage Vdc reaches specified value V2, (step S2 is
YES), main control unit 20 thinks not having to worry surge current.The enabling signal of relay is set as high level by main control unit 20, is beaten
Transistor 22 is opened, then relay 30 is energized state (closing motion) (step S3).Relay contacts when relay 30 is powered
Point 30a is closed, and keeps resistor 3 short-circuit.That is, circuit and the resistor 3 between transformer 2 and filter condenser 4 separate.
In addition, relay tip 30a is that mechanicalness is movable, that is, mechanical contact point.When relay drive signal D is set as high level
When, the shut-in time of 30 contact point 30a of relay has the time delay t2 of msec.
On the other hand, when the power supply of commercial three-phase alternating-current supply 1 is low, along with low, the transformation of the supply voltage
The output voltage of device 2 can also be lower.At this time in order to continue to provide electric power, filter capacitor to the brushless DC motor M as load
The voltage Vdc of device 4 declines.
When the voltage Vdc of filter condenser 4 declines (NO of step S1, the YES of step S4), master controller 20 is based on noninductive
Torque component electric current 1q in vector control unit 50 is answered, judges the size (step S5) of load.Specifically, when torque component electricity
When stream Iq is not up to designated value, master controller 20 judges that the size of load is to be not up to designated value, is light load.Work as torque component
When electric current Iq reaches certain value, master controller 20 judges the size of load more than designated value, is middle load or heavy load.
When the size of load is determined as light load (YES in step S5), master controller 20 is by the voltage of filter condenser 4
Vdc is compared with the 1st setting value V1 ' (step S6).Then, when the voltage V dc of filter condenser 4 are less than the 1st setting value V1 ' (steps
The YES of rapid S56), the drive signal D of relay is set as low-level by master controller 20, and it is the state closed to make diode 22,
Then 30 no power of relay (opening action) (step S7).After 30 no power of relay, relay contacts point 30a is opened, electricity
Hinder the circuit between the input transformer 2 of device 3 and filter condenser 4.
Relay tip 30a is that mechanicalness is movable, i.e. relay tip 30a is mechanical contact point.When relay driving is believed
When number D is set as low-level, relay contacts point 30a has the time t1 delay of msec to before opening.However relay 30
No power selection is the 1st setting value V1 ', and the 1st setting value V1 ' is more than the minimum amount of voltage that V1 for preventing electric current, and voltage Vdc declines
And less than before minimum amount of voltage that V1, relay contacts point 30a is opened, input resists device 3.Therefore, even if voltage Vdc is less than most
Small voltage value V1 not will produce surge current since resistor 3 has been input state at this time.I.e. it is capable to prevent from becoming
The semiconductor switch and diode of depressor 2 are destroyed suddenly.
On the other hand, when the voltage Vdc of filter condenser 4 declines, payload is middle load or heavy load, filter capacitor
The voltage Vdc decrease speeds of device 4 become faster.
The voltage Vdc of filter condenser 4 declines (NO of step S1, the YES of step S4), and the size of load is determined as
Middle load or when heavy load (NO of step S5), master controller 20 is by the voltage Vdc of filter condenser 4 and the 2nd setting value (=rule
Definite value) V2 compares (step S8).Then, when the voltage Vdc of filter condenser 4 is less than the 2nd setting value V2 (YES of step S8)
When, relay drive signal D is set as low-level by master controller 20, closes diode 22, then 30 no power of relay (step
Rapid S7).When 30 no power of relay, relay contacts point 30a is opened, resistor 3 enter transformer 2 and filter condenser 4 it
Between circuit.
At this point, the size of load is middle load or heavy load, voltage Vdc decrease speeds become faster, relay contacts point 30a
The time t1 delay of msec is had before to opening.But what is selected at this time is that the 2nd setting value V2 higher than the 1st setting value V1 ' is used
In 30 no power of relay, voltage Vdc is before dropping to minimum amount of voltage that V1, and relay contacts point 30a is opened, resistor 3
Input.That is, even if voltage Vdc drops to minimum amount of voltage that V1, resistor 3 has been put at this time, not will produce surge
Electric current.Semiconductor switch or diode therefore, it is possible to prevent transformer 2 are destroyed suddenly.
In addition when the voltage Vdc of filter condenser 4 is dropped to than for preventing the minimum amount of voltage that V1 of surge current also low
Setting value V0 when, main control unit 20 make inverter 10 stop conversion.
As described above, the voltage Vdc of filter condenser 4 drop to it is lower than the 1st setting value V1 ' or the 2nd setting value V2, still
When than minimum amount of voltage that V1 high for preventing surge current, 30 no power of relay is made by transistor, even if relay connects
The shut-in time of contact 30a generates delay, also can prevent surge current really.
Moreover, by the 1st setting value V1 ' for making 30 no power of relay when light charge, when middle load or heavy load, uses
2nd setting value (=specified value) V2 higher than the 1st setting value V1 ', in this way will not be by load for making 30 no power of relay
The influence of size can prevent surge current really.
The difference between minimum amount of voltage that V1 about the 1st setting value V1 ' and for preventing surge current, when heavy load
So that voltage Vdc is drastically reduced, between the delay time t2 of the opening and closing of relay contacts point 30a, selects for preventing surge current
Voltage Vdc minimum value.Then, after resistor 3 is put into, the time of surge current generation can be postponed.
After resistor 3 is put into, input electric power (electric current) is limited.When input electric power cannot meet the driving electricity of inverter 10
When power, inverter 10 cannot be driven.However, as described above, resistor 3 can postpone the time of surge current generation, energy
Inverter 10 is enough postponed due to being limited by input current to stop.The result is that the running rate of inverter 10 can improve.In addition,
If resistor 3 is put into, although resistor 3 can consume electric power, when the input of resistor 3 can make the generation of surge current
Between release, be so province's energy.
[2]The explanation of 2nd embodiment
Master controller 20 replaces the 3rd control means of (3) of the 1st embodiment, hair using the 3rd control means of following (3a)
Wave major function.
(3a) payload (middle load or heavy load) more than designated value, and the voltage Vdc of filter condenser 4 declines
And when less than the 2nd setting value (=specified value) V2, level, the 3rd control hand are not up in order to make the size of load become designated value
The output torque of section reduction inverter 10.
Others constitute identical as the 1st embodiment.
The control method of main control unit in operation is illustrated with reference to the flow chart of Fig. 4 and the time diagram of Fig. 5.
For the voltage Vdc of filter condenser 4 when rising (YES of step S1), the processing mode of main control unit 20 is real with the 1st
Apply the step S2 and S3 of example.It is relevant to illustrate to omit.
When the voltage of commercial three-phase alternating-current supply 1 is relatively low, with the reduction of supply voltage, the output voltage Va of transformer 2
Also it can reduce.At this point, in order to the brushless DC motor M sustainable supply electric power as load, the voltage Vdc of filter condenser 4
Decline, is less than the output voltage Va of transformer 2.
When the voltage Vdc of filter condenser 4 declines (NO of step S1, the YES of step S4), main control unit is based on noninductive
The torque component electric current 1q in vector control unit 50 is answered, judges the size (step S5) of load.
When the size of load is determined as the light hours (YES of step S5), main control unit 20 is by the voltage of filter condenser 4
Vdc and the 1st setting value V1 ' compare (step S6).The voltage Vdc of filter condenser 4 less than the 1st setting value V1 ' (step S6's
YES), relay drive signal D is set as low-level by main control unit 20, and closes transistor 22, and then relay 30 is obstructed
Electric (opening action) (step S7).After 30 no power of relay, 30 contact point 30a of relay is opened, and resistor 3 puts into transformer
Circuit between 2 and filter condenser 4.Then, master controller 20 releases (step S10) when aftermentioned output torque is reduced.
On the other hand, when the voltage Vdc of filter condenser 4 declines, when the size of load is middle load or heavy load, filtering
The voltage Vdc decrease speeds of capacitor 4 become faster.
When the voltage Vdc of filter condenser 4 declines (NO of step S1, the YES of step S4), and when the size of load is sentenced
When being set to middle load or heavy load (NO of step S5), main control unit 20 is by the voltage Vdc and the 2nd setting value of filter condenser 4
V2 compares (step S8).Then when the voltage Vdc of filter condenser 4 be less than the 2nd setting value V2 (YES of step S8), in order to make
The size of load becomes the light load of not up to designated value, and main control unit 20 reduces the output torque (step S9) of inverter 20.
Specifically, in order to make payload become the light load of not up to designated value, master controller 20 reduces non-inductive torque control
The torque component electric current 1q in portion 50 processed.The output torque of inverter 10 is reduced in this way, and voltage Vdc is reduced, and makes the decline of light load
Speed is reduced.
After torque component electric current 1q is reduced, the judgement of main control unit 20 becomes step S1 again.If voltage Vdc is persistently reduced
(NO of step S1, the YES of step S4), main control unit 20 judge that the size of load is light load (step S5).
The size of load is reduced to the light hours (YES of step S5), and main control unit 20 is by the voltage of filter condenser 4
Vdc and the 1st setting value V1 ' compare (step S6).Then, when the voltage Vdc of filter condenser 4 is less than the 1st setting value V1 '
The drive signal D of relay is set as low-level by (YES of step 6), main control unit 20, closes transistor 22, make in this way after
30 no power (step S7) of electric appliance.After 30 no power of relay, relay contacts point 30a is opened, and resistor 3 puts into transformer 2
Circuit between filter condenser 4.Then, main control unit 20 releases the torque component electric current in non-inductive vector control unit 50
Iq (output torque reduction) reduces (step S10).
As described above, when the voltage Vdc of filter condenser 4 declines, and payload is to reach the light load of designated value
When, voltage Vdc is less than the 1st setting value V ', and higher than the minimum amount of voltage that V1 for preventing surge current, relay 30, which is mended, at this time leads to
Electricity, even if the opening/closing time of relay contacts point can certainly prevent surge current if postponement.
It is less than in order to make payload become designated value when payload is the middle load or heavy load more than designated value
The output torque of light load, inverter 10 is reduced, and the decrease speed of such voltage Vdc is reduced to the decrease speed of light hours,
The decline of voltage Vdc can certainly be captured.That is, will not be influenced by payload, wave can be certainly prevented
Gush electric current.
Other effects are identical as the 1st embodiment.
[3]The explanation of 3rd embodiment
Main control unit plays major function by the method for following (11)-(13).
(11) when voltage (the detection voltage of voltage detecting element 21) Vdc of filter condenser 4 is more than the 2nd setting value V2, the 1st
Control means make relay 30 do closing motion, and relay contacts point 30a is closed.
(12) when the voltage Vdc of filter condenser 4 is less than the 1st setting value V1 ', the 2nd control means make relay 30 beat
Work is started, relay contacts point 30a is opened.
(13) when the voltage Vdc of filter condenser 4 declines and is less than the 2nd setting value V2, the 3rd control means make inverter 10
Into regeneration mode.When passing through regeneration mode, the output frequency F of inverter 10 is made (such as to allow minimum work less than assigned frequency
Frequency number Fmin).The regeneration mode of inverter 10 terminates at this time, and the 3rd control means control the output torque (torque of inverter 10
Ingredient electric current Iq), so that the output frequency F of inverter 10 is maintained and allows lowest operating frequency Fmin.
Others constitute identical as the 1st embodiment.
The embodiment of main control unit 20 is illustrated with reference to the flow chart of Fig. 6 and the timetable of Fig. 7.
When the voltage Vdc of filter condenser 4 rises (YES of step S1), main control unit 20 is allowed most to remain aftermentioned
Low operating frequency Fmin, is released, and by voltage Vdc compared with the 2nd setting value V2 (step S2).Then, as voltage Vdc
The YES of (step S2) when reaching the 2nd setting value V2), main control unit identification does not have to worry surge current, by relay drive signal
D is set as high level, and transistor 22 is opened, and relay 30 is powered (closing motion) (step S3).With the energization of relay 30,
Relay contacts point 30a is closed, and short circuit is formed to resistor 3, by electricity of the resistor 3 between transformer 2 and filter condenser 4
Road disconnects.In the process flow of the step S1-S3, step S1a is increased only, herein not with the 1st embodiment and the 2nd embodiment
Together.
When the electric current of commercial three-phase alternating-current supply 1 is low, the output voltage Va of transformer 2 can also be lower.At this time in order to right
Brushless DC motor M as load provides lasting electric power, reduces the voltage Vdc of filter condenser 4, makes filter condenser 4
Voltage Vdc be less than transformer 2 output voltage Va.
When the voltage Vdc of filter condenser 4 declines (NO of step S1, the YES of step S4), main control unit 20 compares filtering
The voltage Vdc and the 1st setting value V1 ' (step S1) of capacitor 4.
When the voltage Vdc of filter condenser 4 is not up to the 1st setting value V1 ' (NO of step S11), main control unit 20 compares
The voltage Vdc and the 2nd setting value V2 (step S12) of filter condenser 4.
When the voltage Vdc of filter condenser 4 is less than the 2nd setting value V2 (YES of step S12), main control unit 20 will be noninductive
It answers the torque component electric current Iq in vector control unit 50 to be set as negative value, inverter 10 is made to enter regeneration mode (step S13).
After inverter 10 starts regeneration mode, the voltage Vdc of filter condenser 4 rises, and the output frequency F of inverter 10 is slowly reduced.
The output frequency F of inverter 10 is less than when allowing lowest operating frequency Fmin (YES of step S14), main control unit
20 stop the regeneration mode of inverter 10, and torque component electric current Iq is made to become normal value (step S15) again, control the defeated of inverter 10
Go out torque (torque component electric current Iq), the output frequency F of inverter 10 is made to maintain lowest operating frequency Fmin (step S16).
Then, main control unit 20 controls the output torque on one side, returns to step S1 on one side.
When main control unit 20 persistently controls the output torque of inverter 10, the voltage Vdc of filter condenser 4 declines and is less than
Setting value V1 ' the YES of the YES of step S4, step S11 (NO of step S1).Main control unit makes 30 no power (step of relay
S17 it), and by output frequency F is maintained at and allows lowest operating frequency Fmin (output torque of control inverter 10) (step
S18)。
As described above, the voltage Vdc of filter condenser 4 drops to the 1st setting value V1 ', and higher than for preventing surge
The minimum amount of voltage that V1 of electric current, 30 no power of relay at this time, even if can if the opening/closing time delay of relay contacts point 30a
Perfectly prevent surge current.
Moreover, the voltage Vdc of filter condenser 4 declines and be less than the 2nd specified value V2, but it is higher than the 1st setting value V1 ', it is inverse
Become device 10 and enter regeneration mode, so that the voltage Vdc of filter condenser 4 is increased by the regeneration energy, to the greatest extent based on setting value V1 '
The possible input for postponing resistor 3.Thus, it is possible to reduce the power loss in resistor 3, as far as possible based on setting value V0
Avoid the stopping of inverter 10.
Other effects are the same as the 1st embodiment.
[4]The explanation of 4th embodiment
In the present embodiment, judge that brushless DC motor M's is negative by the variation size of the voltage Vdc of filter condenser 4
Lotus size.
Main control unit 20 is functioned by following (21)-(24) means.
(21) when commercial three-phase alternating-current supply 1 is stablized, the voltage of filter condenser 4 at this time is acquired, normal voltage is denoted as.It will
The normal voltage subtracts voltage (the detection voltage of voltage detecting element 21) Vdc of current filter condenser 4, obtains voltage change
Change amount Δ Vdc.According to above-mentioned standard voltage, the average voltages of the voltage Vdc of filter condenser 4 within a specified time are acquired
Vdcx.Average value Vdcx be voltage Vdc in prolonged integrated value, can be acquired by low-pass filter.
(22) when above-mentioned voltage variety Δ Vdc is not up to formulation amount Δ Vs, it is believed that payload is not up to designated value, is
Light load.When above-mentioned voltage variety Δ Vdc is more than formulation amount Δ Vs, it is believed that payload is more than designated value, is middle load
Or heavy load.
(23) when voltage (the detection voltage of voltage detecting element 21) Vdc of filter condenser 4 is more than the 2nd setting value V2, the 1st
Control means make relay 30 do closing motion, close relay contacts point 30a.
(24) above-mentioned judgement result is light load, and the voltage Vdc of filter condenser 4 declines, and is less than the 1st setting value
V1'(<When V2), the 2nd control means make relay 30 do opening operation, and open relay contacts point 30a.
(25) above-mentioned judging result is middle load or heavy load, and the voltage of filter condenser 4 declines and is less than the 2nd and sets
When the occasion of definite value V2, the 3rd control means make relay 30 do opening action, and open relay contacts point 30a.
Others constitute identical as the 1st embodiment.
The control method of main control unit 20 is illustrated with reference to the flow chart of Fig. 8.
The average value Vdcx of the voltage Vdc of filter condenser 4 is calculated according to the low-pass filter in certain time, meter
The difference between the average value Vdcx and the voltage Vdc of present filter condenser 4 is calculated, voltage variety Δ Vdc (steps are obtained
S0)。
Then, when the voltage Vdc of filter condenser 4 rises (YES of step S1), master controller 20 compares filter condenser
4 voltage Vdc and specified value V2 (step S2).When the voltage Vdc of filter condenser 4 reaches specified value V2 (YES of step S2),
The judgement of master controller 20 needs not worry about surge current, and relay drive signal D is set as high level, opens transistor 22,
So that relay contacts point 30a is closed, short circuit is formed to resistor 3, by resistor 3 between transformer 2 and filter condenser 4
Circuitry cuts.
When the voltage Vdc of filter condenser 4 declines (NO of step S1, the YES of step S4), master controller 20 will be above-mentioned
The voltage variety Δ Vdc acquired is compared with specified amount Δ V (step S5a).
Voltage variety Δ Vdc very littles, and when not up to specified amount Δ Vs (YES of step S5a), main control unit 20 judges
Load is the light load of not up to designated value, and the voltage Vdc of filter condenser 4 and the 1st setting value V1 ' are compared (step S6).
Then, when the high pressure Vdc of filter condenser 4 is less than setting value V1 ' (Yes of step S6), main control unit 20 is by relay driving
Signal D is set as low-level, closes transistor 22, makes relay 30a no powers (step S7).After 30 no power of relay, after
Relay contacts point 30a is opened, and resistor 3 is put into.
When voltage variety Δ Vdc is than specified amount Δ Vs high (NO of step S5a), main control unit 20 judge load for more than
The voltage Vdc of filter condenser 4 and the 2nd setting value V2 are compared (step by the middle load and heavy load of designated value, main control unit 20
S8).Then, when the voltage Vdc of filter condenser 4 is less than the 2nd setting value V2 (YES of step S8), main control unit 20 is by relay
Device drive signal D is set as low-level, transistor 22 is closed, then by 30 attachment removal (step S7) of relay.Relay goes attached
Makes relay contacts point 30a open, and resistor 3 is put into.
As described above, using the average value Vdcx of the voltage Vdc of filter condenser 4 as normal voltage, gradually acquire, calculates
The potential difference variation delta Vdc of the voltage Vdc of the average value Vdcx and present filter condenser 4 becomes according to the voltage
Change amount Δ Vdc judges that the size of load, light hours make 30 no power of relay, middle load or heavy burden using the 1st setting value V1 '
The 2nd setting value V2 higher than the 1st setting value V1 ' is selected to be used for 30 no power of relay when lotus, it in this way will not be by payload
Influence, can be certain prevent surge current.
Other effects are identical as the 1st embodiment, in addition, in the 4th embodiment, by the voltage Vdc's of filter condenser 4
Average value Vdcx reduces the voltage Vdc memories before occurring as normal voltage, by supply voltage, and being then used as normal voltage is also
It is feasible.
[5]Variation
In above-described embodiment, voltage Vdc when decline uses the 2nd setting value, makes relay no power；Voltage when rising
Vdc uses specified value V2, makes relay power.It is also possible that 2nd setting value does not do restriction.That is, the 2nd setting value is only
It is higher than setting value V1 ', and is rationally set according to the either on or off time delay of relay 30 or the consumption amount of power of inverter 10
It is fixed.
In addition, above-described embodiment and variation are merely illustrative, the use scope of not restricted embodiment.These are new
Grain husk embodiment can be used for other embodiments, without departing from the present invention principle, it is convenient to omit, replace and change.This
The variation of a little embodiments and they, the requirement containing invention and purpose, also contain the scope of the claims of the present invention.
Claims (5)
1. a kind of power-converting device, which is characterized in that including rectifier, filter condenser, inverter, resistor, relay
And commercial ac power source is changed into direct current by control method, rectifier；Filter condenser is connect with the output end of the rectifier；
The voltage of the filter condenser is changed into alternating voltage by inverter, and the alternating voltage is exported as driving power to negative
Lotus；Circuit of the resistor configuration between the rectifier and the filter condenser, for preventing surge current；Relay with
The capacitor in parallel arrangement, and contain and have point of contact；
Wherein, the control method is：When the voltage of the filter condenser rises and is more than specified value, control means make institute
It states relay and does shutoff operation, when the voltage of the filter condenser declines and is less than 2 setting value, control means make described
The output frequency of inverter, which is reduced to, allows minimum operating frequency, to make the output frequency of the inverter keep allowing minimum fortune
Turn frequency, control the output torque of the inverter, when the voltage of the filter condenser declines and is less than than the 2nd setting
When being worth 1 also low setting value, control means make the relay do opening operation, while releasing the control to the output torque
System；
Wherein, it is set in order to make the electric current for flowing through the rectifier be no more than the maximum allowed current of the rectifier, the described 1st
Value is higher than the minimum amount of voltage that of the filter condenser.
2. power-converting device according to claim 1, which is characterized in that told control method is：When the filtered electrical
When the voltage of container declines and is less than 2 setting value, start the regeneration mode of the inverter, passes through the regeneration mould of the startup
The output frequency of the inverter is reduced to the minimum operating frequency of permission by formula.
3. a kind of power-converting device, which is characterized in that including：
The voltage of commercial ac power source is changed into direct current by rectifier,
Filter condenser is connected with the output end of the rectifier,
The voltage of the filter condenser is changed into alternating voltage by inverter, and the alternating voltage is exported as driving power
To load, resistor configures the circuit between the rectifier and the filter condenser, for preventing surge current,
Relay is arranged with the capacitor in parallel, and is contained and had point of contact,
And control method, the control method are：
When the voltage of the filter condenser rises and is more than specified value, the control method makes the relay be closing behaviour
Make；
The payload is not up to specified value, and the voltage of the filter condenser declines and be less than the 1st setting value, described
1st setting value is less than the specified value, and the control method makes the relay do opening operation；
The payload is more than specified value, and the voltage of the filter condenser declines and be less than the 2nd setting value, the control
Method processed makes the relay do opening operation；
In order to enable the electric current for flowing through the rectifier is no more than the maximum allowed current of the rectifier, the 1st setting value
Higher than the minimum amount of voltage that of the filter condenser；
Wherein, the 2nd setting value is higher than the 1st setting value, and is less than the specified value.
4. a kind of power-converting device, which is characterized in that including：
The voltage of commercial ac power source is changed into direct current by rectifier,
Filter condenser is connected with the output end of the rectifier,
The voltage of the filter condenser is changed into alternating voltage by inverter, and the alternating voltage is exported as driving power
To load, resistor configures the circuit between the rectifier and the filter condenser, for preventing surge current,
Relay is arranged with the capacitor in parallel, and is contained and had point of contact,
And control method, the control method are：
When the voltage of the filter condenser rises and is more than specified value, it is dynamic that the control method makes the relay do closing
Make；
The payload is not up to specified value, and the voltage of the filter condenser declines and be less than the 1st setting value, and the described 1st
Setting value is less than the specified value, and the control method makes the relay do opening operation；
The payload is more than specified value, and the voltage of the filter condenser declines and is less than higher than the 1st setting value
The output torque of 2nd setting value, the inverter is slack-off.
5. power-converting device according to claim 3, which is characterized in that described in when stablizing the commercial ac power source
The voltage of filter condenser as normal voltage, using the normal voltage and the difference of the voltage of present filter condenser as
Voltage variety；
When the voltage variety is less than specified amount, the control method judges that the payload is not up to designated value；
When the voltage variety is higher than specified amount, the control method judges that the payload is more than designated value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014085396 | 2014-04-17 | ||
| JP2014-085396 | 2014-04-17 | ||
| PCT/JP2015/060852 WO2015159760A1 (en) | 2014-04-17 | 2015-04-07 | Power conversion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105874702A CN105874702A (en) | 2016-08-17 |
| CN105874702B true CN105874702B (en) | 2018-10-26 |
Family
ID=54323971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580003687.7A Active CN105874702B (en) | 2014-04-17 | 2015-04-07 | Power-converting device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6255088B2 (en) |
| CN (1) | CN105874702B (en) |
| WO (1) | WO2015159760A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107925359B (en) * | 2015-11-18 | 2020-07-28 | 株式会社日立产机系统 | Power conversion device |
| JP6721443B2 (en) * | 2016-07-20 | 2020-07-15 | 東芝シュネデール・インバータ株式会社 | Inverter device |
| CN110098722B (en) * | 2019-05-06 | 2021-04-13 | 阳光电源股份有限公司 | Switching method, device and system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62196072A (en) * | 1986-02-21 | 1987-08-29 | Mitsubishi Electric Corp | Rush-current limitting circuit for inverter |
| JPS63124766A (en) * | 1986-11-13 | 1988-05-28 | Matsushita Electric Ind Co Ltd | Rush current limiting circuit |
| JPS63262026A (en) * | 1987-04-16 | 1988-10-28 | 日本電気株式会社 | Ac-dc switching source input voltage monitoring circuit |
| JP2012147548A (en) * | 2011-01-11 | 2012-08-02 | Konica Minolta Business Technologies Inc | Power supply device |
-
2015
- 2015-04-07 WO PCT/JP2015/060852 patent/WO2015159760A1/en active Application Filing
- 2015-04-07 JP JP2016513728A patent/JP6255088B2/en not_active Expired - Fee Related
- 2015-04-07 CN CN201580003687.7A patent/CN105874702B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2015159760A1 (en) | 2017-04-13 |
| JP6255088B2 (en) | 2017-12-27 |
| CN105874702A (en) | 2016-08-17 |
| WO2015159760A1 (en) | 2015-10-22 |
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