CN105874702A - Power conversion device - Google Patents
Power conversion device Download PDFInfo
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- CN105874702A CN105874702A CN201580003687.7A CN201580003687A CN105874702A CN 105874702 A CN105874702 A CN 105874702A CN 201580003687 A CN201580003687 A CN 201580003687A CN 105874702 A CN105874702 A CN 105874702A
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- Prior art keywords
- voltage
- filter capacitor
- relay
- setting value
- setting
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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
An inrush current prevention resistor is disposed on the current path between a converter and a smoothing capacitor, and the contact of a relay is connected in parallel with the resistor. When the voltage of the smoothing capacitor rises to a specified value or more, the relay is allowed to perform a close operation, and when the voltage of the smoothing capacitor falls to less than a set value, the relay is allowed to perform an open operation. The set value is higher than the minimum voltage value of the smoothing capacitor, which is necessary for the current flowing through the converter not to exceed the allowable maximum current of the converter.
Description
Technical field
Embodiments of the invention relate to power-converting device, and the voltage of alternating current power supply is changed into direct current by described power converter apparatus,
At the alternating voltage that described DC voltage is changed into assigned frequency.
Background technology
Power-converting device includes rectification circuit, filter capacitor and inverter.The voltage of commercial ac power source is turned by rectification circuit
Become direct current；The output voltage of described rectification circuit is made Filtering Processing by filter capacitor；Inverter is by the voltage of filter capacitor
It is changed into the alternating voltage of assigned frequency.PTC thermistor (one is configured between commercial ac power source and the power line of rectification circuit
Planting resistor, along with temperature rises, resistance also can increase).PTC thermistor is used for preventing surge current.PTC temperature-sensitive electricity
Resistance is arranged in parallel with relay contacts point.
In described power-converting device, in advance relay contacts point is opened, make PTC thermistor participate in power-on circuit.So,
Can surge current after power supply opening.
Then, along with the voltage of filter capacitor rises, surge current is not worried.Now relay contacts point is closed, make
PTC thermistor short circuit, PTC thermistor disconnects.When the voltage of commercial current and power supply temporarily reduces, the electricity of filter capacitor
Force down when the output voltage of rectification circuit, open relay contacts point, make PTC thermistor again participate in power-on circuit, i.e.
Surge current can be prevented.
[prior art document]
[patent documentation]
[patent documentation 1] Japanese patent application discloses No. 2011-182568.
Summary of the invention
[problem that invention intends to solve]
In above-mentioned power-converting device, the electric current that power line flows through is relatively big, and also can produce during semiconductor switch either on or off
Power loss, has therefore put into PTC thermistor and the relay that can separate.But, relay is according to electric power signal machinery
Property change contact point action, from the delay receiving electric power signal and having to the actually opened closedown of contact point several msec time.Because
Described 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, and described power-converting device can positively prevent wave
Gush electric current.
[solving the mode of problem]
The power-converting device of claim 1 includes transformator, filter capacitor, inverter, resistor, relay and control
Means.The voltage transformation of commercial ac power source is direct current by described transformator；Described filter capacitor and the output of described transformator
End connects；The voltage of described filter capacitor is changed into alternating voltage by described inverter, and the alternating voltage after transformation is as driving
Electric power exports to load；Resistor configuration circuit between the power-on circuit of described transformator and described filter capacitor, prevents
Surge current；Relay is connected with described capacitor in parallel, and containing having point of contact；The voltage of described filter capacitor rises to
Time more than setting, control device makes described relay make closing motion, when the voltage of described filter capacitor is less than setting value,
Control device makes described relay make opening action.In order to make the electric current the flowing through described transformator maximum restriction less than transformator
Current value, described setting value is higher than the minimum amount of voltage that of described filter capacitor.
Accompanying drawing explanation
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 in voltage of filter capacitor in the 1st embodiment, the change of relay drive signal and
The change of 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 in voltage of filter capacitor in the 2nd embodiment, the change of relay drive signal and
The change of 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 in voltage of filter capacitor in the 3rd embodiment, the change of relay drive signal and
The change of normally opened contact point.
Fig. 8 is flow chart, it is shown that the control method of the 4th embodiment.
Detailed description of the invention
Referring to figure, embodiments of the invention 1 are illustrated.
As it is shown in figure 1, transformator 2 connects commercial three-phase alternating-current supply 1.Transformator 2 is containing multiple switch elements and multiple two
Pole is managed, and the alternating voltage of commercial three-phase alternating-current supply 1 is converted to DC voltage.The outfan of described transformator 2 passes through resistance
Device 3 and the parallel circuit of relay contacts point 30a, be connected with filter capacitor (electrolysis condenser) 4.Resistor 3 is PTC
Critesistor, is used for preventing surge current.Relay contacts point 30a is the normally opened contact point of relay 30.
Then, inverter 10 is connected with filter capacitor 4, brushless DC motor (being also called permagnetic synchronous motor) M conduct
Load is connected with the outfan of inverter 10.Inverter 10 is containing switch element T1, T2, T3, T4, T5 and T6.Two
Switch element T1, T2 form U-shaped series circuit, and backflow diode is connected in antiparallel with T1, T2 respectively；Two switches
Element T3, T4 form V-arrangement series circuit, and backflow diode is connected in antiparallel with T3, T4 respectively；Two switch elements
T5, T6 form W row series circuit, and backflow diode is connected in antiparallel with T5, T6 respectively；Filter capacitor 4 is by voltage
Being changed into the alternating voltage of assigned frequency, the alternating voltage after transformation exports to brushless DC motor M, as brushless DC
The driving electric of motor M.Phase spiral Lu, Lv, Lw of brushless DC motor M goes here and there with each of described inverter 10 respectively
A connection that contacts with each other for two switch elements in connection circuit.
By the colelctor electrode emitter of NPN transistor 22, above-mentioned relay 30 is applied DC voltage Vd.NPN type is brilliant
The base portion of body pipe 22 is connected with master control part 20.When master control part 20 provides high level relay drive signal, NPN type
Driver 22 is opened, and when master control part 20 provides low-level relay drive signal, NPN type driver 22 is closed.NPN
When transistor npn npn 22 is opened, the magnetizing coil energising of relay 30, relay contacts point 30a closes.It is to say, relay
Device 30 is closing motion.When NPN transistor 22 is closed, the magnetizing coil no power of relay 30, relay contacts point
30a opens.It is to say, relay 30 is opening action.
The two ends of above-mentioned filter capacitor 4 connect voltage detecting element 21.Voltage detecting element 21 detects described filter capacitor 4
The voltage Vdc produced.Described voltage detecting element 21 is connected with master controller 20.
Each electrified wire configuration current inductor (electric current between outfan and the brushless DC motor M of above-mentioned inverter 10
Transformator) 11,12,13.Current inductor 11,12,13 detect respectively flow through brushless DC motor M phase spiral Lu,
The electric current (phase current) of Lv, Lw.These current inductors 11,12,13 are connected with master control part 20.
Master control part 20 is also connected with ensorless control portion 50.Ensorless control portion 50 examines containing electric current
Go out portion 51, speed estimating operational part 52, integration part 53, subtraction portion 54, speed controlling portion 55, operational part 56, subtraction portion
57,58, current control division (the 1st current control division) 61, current control division (the 2nd current control division) 62 and PWM letter
Number generating unit.
The detection electric current of current inductor 11,12,13 is 2 phases from 3 phase in version by electric current detecting element 51, calculates nothing respectively
Magnetic field axis (d axle) coordinate on brushless DC motor M steamed roll axle and torque axis (q axle) coordinate, detect magnetic field components electricity
Stream (referred to as d shaft current) 1d and torque component electric current (q shaft current) 1q.Speed estimating operational part 52 is based on electric current detecting element
Magnetic field components electric current 1d that 51 detect and torque component electric current 1q, carries out computing and infers the rotor speed of brushless DC motor M
Degree ω est.Specifically, the magnetic field using magnetic field components electric current 1d, torque component electric current 1q, current control division 61 to try to achieve becomes
The magnetic field components voltage Vq that component voltage Vd and current control division 62 are tried to achieve carries out computing, infers magnetic in brushless DC motor M
Composition speed power generation power (being also called d axle speed power generation power) Ed, ratio based on described d axle speed power generation power Ed, long-pending
Sub-control system (PI control) computing, infers rotor speed omega est.
Deduction rotor speed omega est that speed estimating operational part 52 is obtained by integration part 53 is integrated, and obtains inferring rotor-position
θest.Described deduction rotor position est is provided to current detecting part 51 and PWM signal generation section 63.Subtraction portion 54
Target velocity ω ref master control part 20 transmitted and rotor speed omega est subtraction, obtain target velocity ω ref and deduction
Velocity deviation between rotor speed omega ref.The velocity deviation that subtraction portion 54 is obtained by speed controlling portion 55 carries out ratio, integration
Control (PI control) computing, it is thus achieved that desired value Iqref of torque component electric current Iq.Operational part 56 is from torque component electric current Iq
Desired value Idref of desired value Iqref calculating magnetic field composition electric current Id.Desired value Idref is become by subtraction portion 57 with magnetic field
Electric current Id is divided to subtract, it is thus achieved that deviation delta Id between desired value Idref and magnetic field components electric current Id.Operational part 58 is by mesh
Scale value IqRef subtracts with torque component electric current Iq, it is thus achieved that the deviation delta between desired value Iqref and torque component electric current Iq
Iq。
Current control division 61 is according to the ratio of deviation delta Id, integration control (PI control) computing, by brushless DC motor
D axial coordinate conversion on M rotor axle, obtains magnetic field components voltage Vd.Current control division 62 is according to the ratio of deviation delta Iq
Example, integration control (PI control) computing, convert the q axial coordinate on brushless DC motor M rotor axle, obtain magnetic
Field becomes component voltage Vq.PWM signal generation section is according to magnetic field part voltage Vd, torque component voltage Vq and presumption rotor-position
θ est, generates pulse-amplitude modulation signal (being also called pwm signal) to inverter 10.Described pwm signal makes inverter 10
Switch element T1-T6 open or close, produce driving voltage Vu, Vv, Vw from inverter 10, output is to brushless DC
Phase spiral Lu, Lv, Lw of electronics M.Thus, it is possible to the speed controlling brushless DC motor M at short notice reaches mesh
Mark speed.
Master control part 20 plays main function by the method for following (1)-(3).
(1) rise as voltage (the detection voltage of the voltage detecting element 21) Vdc of filter capacitor 4 and be higher than setting V2
Time, the 1st control device makes relay produce closing motion, closes relay contacts point 30a.
(2) payload does not arrives designated value (light load), and the voltage Vdc of filter capacitor 4 declines and is less than and presets
The 1st setting value V1 ' (< V2) time, the 2nd control device makes relay 30 produce opening action, opens relay contacts point
30a.Due to the 1st setting value V1 ' less than setting V2, in order to make the electric current flowing through transformator 2 appearance less than transformator 2
Permitted maximum current, the 1st setting value V1 ' need minimum amount of voltage that V1 higher than filter capacitor 4.Transformator 2 allow maximum
Electric current is switch element or the maximum rated current of diode in transformator 2.
(3) payload exceedes designated value (middle load or heavy load), and the voltage Vdc of filter capacitor 4 declines and is less than
2nd setting value (higher than above-mentioned 1st setting value V1 '), the 3rd control device makes relay 30 produce opening action, opens and continues
Relay contacts point 30a.2nd setting value uses setting V2.Below the 2nd setting value is set as setting symbol " V2 ".
Below, with reference to the flow chart of Fig. 2 and the time diagram of Fig. 3, the control mode of master control part 20 is illustrated.
If using commercial three-phase alternating-current supply 1, the voltage of described commercial three-phase alternating-current supply 1 is changed into directly by transformator 2
Stream voltage Va.Described DC voltage Va applies to filter capacitor 4.After filter capacitor 4 is applied in voltage, its voltage Vdc
Rise.
When described power supply puts into, the difference between transformator 2 output voltage Va and the voltage Vdc of filter capacitor 4 is " Va-Vdc ",
It is Z from the line impedance of commercial three-phase alternating-current supply 1 to filter capacitor 4, then show that surge current is Ix=(Va-Vd
c)/Z.Surge current flows to filter capacitor 4 from transformator 2., when transformator 2 and filter capacitor 4 circuit it
Between relay contacts point 30a open, when resistor 3 puts into, the actual electric current flow through changes.Now electric current is Iy=
(Va-Vdc)/(Z+R).Described electric current Iy value allows maximum current less than transformator 2.In such manner, it is possible to prevent
The switch element of transformator 2 and diode are destroyed.
When the voltage Vdc of filter capacitor 4 rises (YES of step S1), master control part 20 is by the electricity of filter capacitor 4
Pressure Vdc compares (step S2) with setting (the=the 2 setting value) V2.Then, setting V2 is reached as voltage Vdc
Time (step S2 is YES), master control part 20 is thought and is not worried surge current.Master control part 20 is by the startup of relay
Signal is set to high level, opens transistor 22, and then relay 30 is "on" position (closing motion) (step S3).Continue
When electrical equipment 30 is energized, relay contacts point 30a closes, and makes resistor 3 short circuit.It is to say, transformator 2 and filter capacitor
Circuit between 4 separates with resistor 3.It addition, relay tip 30a to be mechanicalness movable, namely Mechanical Contact point.
When relay drive signal D is set as high level, the shut-in time of relay 30 contact point 30a has the time of msec and prolongs
T2 late.
On the other hand, when the power supply of commercial three-phase alternating-current supply 1 is low, low along with described supply voltage, transformator 2
Output voltage also can step-down.Now in order to continue to provide electric power, filter capacitor to the brushless DC motor M as load
The voltage Vdc of 4 declines.
When the voltage Vdc of filter capacitor 4 declines (NO of step S1, the YES of step S4), master controller 20 based on
Torque component electric current 1q in non-inductive vector control unit 50, it is determined that the size (step S5) of load.Specifically, torsion is worked as
When square composition electric current Iq is not up to designated value, master controller 20 judge the size of load as not up to designated value, for light load.
When torque component electric current Iq reaches certain value, master controller 20 judge the size of load more than designated value, for middle load or
Heavy load.
When the size of load is judged to light load (YES in step S5), and master controller 20 is by the voltage of filter capacitor 4
Vdc and the 1st setting value V1 ' compare (step S6).Then, when the voltage Vdc of filter capacitor 4 is less than the 1st setting
Value V1 ' (YES of step S56), the driving signal D of relay is set as low-level, makes diode by master controller 20
22 is the state closed, then relay 30 no power (opening action) (step S7).After relay 30 no power, continue
Relay contacts point 30a opens, and resistor 3 puts into the circuit between transformator 2 and filter capacitor 4.
Relay tip 30a is that mechanicalness is movable, i.e. relay tip 30a is Mechanical Contact point.When relay drive signal D
When being set as low-level, relay contacts point 30a to the time t1 having msec before opening postpones.But relay 30 is not
What energising selected is the 1st setting value V1 ', the 1st setting value V1 ' it is more than minimum amount of voltage that V1 preventing electric current, voltage Vdc
Before declining and being less than minimum amount of voltage that V1, relay contacts point 30a opens, and puts into opposing device 3.Therefore, though voltage
Vdc is less than minimum amount of voltage that V1, owing to now resistor 3 has been input state, will not produce surge current.It is to say,
The semiconductor switch and the diode that are prevented from transformator 2 are destroyed suddenly.
On the other hand, when the voltage Vdc of filter capacitor 4 declines, payload is middle load or heavy load, filter capacitor
The voltage Vdc decrease speed of 4 accelerates.
The voltage Vdc of filter capacitor 4 declines (NO of step S1, the YES of step S4), and the size of load is sentenced
When being set to middle load or heavy load (NO of step S5), master controller 20 is by the voltage Vdc and the 2nd of filter capacitor 4
Setting value (=setting) V2 compares (step S8).Then, when the voltage Vdc of filter capacitor 4 is less than the 2nd setting
During value V2 (YES of step S8), relay drive signal D is set as low-level by master controller 20, closes diode
22, then relay 30 no power (step S7).During relay 30 no power, relay contacts point 30a opens, resistance
Device 3 enters the circuit between transformator 2 and filter capacitor 4.
Now, the size of load is middle load or heavy load, and voltage Vdc decrease speed accelerates, and relay contacts point 30a arrives
The time t1 having msec before opening postpones.But now select is than the 1st setting value V1 ' high the 2nd setting value V2
For relay 30 no power, voltage Vdc is before dropping to minimum amount of voltage that V1, and relay contacts point 30a opens, electricity
Resistance device 3 puts into.It is to say, even if voltage Vdc drops to minimum amount of voltage that V1, now resistor 3 has been put into, will not
Produce surge current.Therefore, it is possible to prevent the semiconductor switch of transformator 2 or diode from being destroyed suddenly.
In addition ratio is dropped to for preventing the lowest the setting of minimum amount of voltage that V1 of surge current as the voltage Vdc of filter capacitor 4
During definite value V0, master control part 20 makes inverter 10 stop conversion.
As it has been described above, the voltage Vdc of filter capacitor 4 drops to than the 1st setting value V1 ' or the 2nd setting value V2 low, but
When being higher than minimum amount of voltage that V1 for preventing surge current, make relay 30 no power by transistor, though relay
The shut-in time of contact point 30a produces and postpones, it is also possible to certain prevents surge current.
And, by the 1st setting value V1 during light electric charge ' it is used for making relay 30 no power, use ratio when middle load or heavy load
1st setting value V1 ' the 2nd high setting value (=setting) V2 is used for making relay 30 no power, and so will not be by negative
The impact of lotus size, it is possible to certain prevents surge current.
About the 1st setting value V1 ' and it is used for the difference prevented between minimum amount of voltage that V1 of surge current, even if during heavy load
Voltage Vdc drastically reduces, and the time delay of the opening and closing of relay contacts point 30a between t2, selects for preventing surge current
The minima of voltage Vdc.Then, after resistor 3 puts into, it is possible to postpone the time that surge current occurs.
After resistor 3 puts into, limit input electric power (electric current).When input electric power can not meet the driving electric of inverter 10
Time, inverter 10 can not be driven.But, as described above, resistor 3 can postpone the time that surge current occurs, energy
Enough postpone inverter 10 to be stopped owing to limiting by input current.Result is that the running rate of inverter 10 can improve.Additionally,
If putting into resistor 3, although resistor 3 can consume electric power, but the input of resistor 3 can make the generation of surge current
Time is released, and is so province's energy.
The explanation of [2] the 2nd embodiments
Master controller 20 uses the 3rd control device of (3) of the 3rd control device replacement the 1st embodiment of following (3a),
Play major function.
(3a) the voltage Vdc of payload (middle load or heavy load) more than designated value, and filter capacitor 4 declines
And during less than the 2nd setting value (=setting) V2, it is not up to level to make the size of load become designated value, the 3rd controls
Means reduce the output moment of torsion of inverter 10.
Other composition is identical with the 1st embodiment.
With reference to the flow chart of Fig. 4 and the time diagram of Fig. 5, the master control part control method when operation is illustrated.
The voltage Vdc of filter capacitor 4 is when rising (YES of step S1), and the processing mode of master control part 20 is with the 1st
Step S2 of embodiment and S3.Relevant explanation is omitted.
When the voltage of commercial three-phase alternating-current supply 1 is relatively low, along with the reduction of supply voltage, the output voltage Va of transformator 2 also can
Reduce.Now, in order to give the brushless DC motor M sustainable supply electric power as load, the voltage Vdc of filter capacitor 4
Decline, less than the output voltage Va of transformator 2.
When the voltage Vdc of filter capacitor 4 declines (NO of step S1, the YES of step S4), master control part is based on nothing
Torque component electric current 1q in induction vector control portion 50, it is determined that the size (step S5) of load.
When the size of load is judged to the light hours (YES of step S5), and master control part 20 is by the voltage of filter capacitor 4
Vdc and the 1st setting value V1 ' compare (step S6).The voltage Vdc of filter capacitor 4 is less than the 1st setting value V1 ' (step
The YES of rapid S6), relay drive signal D is set as low-level by master control part 20, and closes transistor 22, then
Relay 30 no power (opening action) (step S7).After relay 30 no power, relay 30 contact point 30a beats
Opening, resistor 3 puts into the circuit between transformator 2 and filter capacitor 4.Then, master controller 20 is at aftermentioned output moment of torsion
(step S10) is released during minimizing.
On the other hand, when the voltage Vdc of filter capacitor 4 declines, when the size of load is middle load or heavy load, filtered electrical
The voltage Vdc decrease speed of container 4 accelerates.
When the voltage Vdc of filter capacitor 4 declines (NO of step S1, the YES of step S4), and work as the big of load
Little be judged to when middle load or heavy load (NO of step S5), master control part 20 by the voltage Vdc of filter capacitor 4 and
2nd setting value V2 compares (step S8).Then when the voltage Vdc of filter capacitor 4 is less than the 2nd setting value V2 (step
The YES of rapid S8), in order to make the size of load become the light load of not up to designated value, master control part 20 reduces inverter 20
Output moment of torsion (step S9).Specifically, in order to make payload become the light load of not up to designated value, master controller
The 20 torque component electric current 1q reducing non-inductive moment of torsion control portion 50.So output moment of torsion of inverter 10 reduces, voltage
Vdc reduces, and makes the decrease speed of light load reduce.
After torque component electric current 1q reduces, the judgement of master control part 20 becomes step S1 again.If voltage Vdc persistently reduces (step
The rapid NO of S1, the YES of step S4), master control part 20 judges that the size of load is as light load (step S5).
The size of load is reduced to the light hours (YES of step S5), and master control part 20 is by the voltage of filter capacitor 4
Vdc and the 1st setting value V1 ' compare (step S6).Then, when the voltage Vdc of filter capacitor 4 is less than the 1st setting
During value V1 ' (YES of step 6), the driving signal D of relay is set as low-level by master control part 20, closes crystal
Pipe 22, so makes relay 30 no power (step S7).After relay 30 no power, relay contacts point 30a opens,
Resistor 3 puts into the circuit between transformator 2 and filter capacitor 4.Then, master control part 20 releases non-inductive vector controlled
Torque component electric current I q (output moment of torsion reduces) in portion 50 reduces (step S10).
During as it has been described above, the voltage Vdc of filter capacitor 4 declines, and payload is to reach the light hours of designated value,
Voltage Vdc is less than the 1st setting value V ', it is higher than minimum amount of voltage that V1 preventing surge current, now relay 30 is mended logical
Electricity, even if the opening/closing time of relay contacts point is postponed, also can positively prevent surge current.
When payload is more than the middle load of designated value or heavy load, in order to make payload become designated value less than light load,
The output moment of torsion of inverter 10 reduces, and the decrease speed of such voltage Vdc is reduced to the decrease speed of light hours, it is possible to really
Capture the decline of voltage Vdc on the spot.It is to say, will not be affected by payload, it is possible to positively prevent surge current.
Other effect is identical with the 1st embodiment.
The explanation of [3] the 3rd embodiments
Master control part plays major function by the method for following (11)-(13).
(11) when voltage (the detection voltage of the voltage detecting element 21) Vdc of filter capacitor 4 is more than 2 setting value V2,
1st control device makes relay 30 do closing motion, and relay contacts point 30a closes.
(12) the voltage Vdc of filter capacitor 4 is less than the 1st setting value V1 ' time, the 2nd control device makes relay 30 do
Opening action, relay contacts point 30a opens.
(13), when the voltage Vdc of filter capacitor 4 declines and is less than 2 setting value V2, the 3rd control device makes inverter
10 enter regeneration mode.During by regeneration mode, the output frequency F of inverter 10 is made (such as to allow minimum less than assigned frequency
Operating frequency number Fmin).Now the regeneration mode of inverter 10 terminates, and the 3rd control device controls the output of inverter 10 and turns round
Square (torque component electric current Iq), makes the output frequency F of inverter 10 maintain and allows lowest operating frequency Fmin.
Other composition is identical with the 1st embodiment.
With reference to the flow chart of Fig. 6 and the timetable of Fig. 7, the embodiment of master control part 20 is illustrated.
When the voltage Vdc of filter capacitor 4 rises (YES of step S1), master control part 20 is allowed to remain aftermentioned
Low operating frequency Fmin, is released, and voltage Vdc and the 2nd setting value V2 are compared (step S2).Then,
The YES of (step S2) when voltage Vdc arrives 2 setting value V2), surge current is not worried in master control part identification,
Relay drive signal D being set as, high level, transistor 22 are opened, and relay 30 is energized (closing motion) (step S3).
Along with the energising of relay 30, relay contacts point 30a closes, resistor 3 is formed short circuit, by resistor 3 from transformator
Circuit between 2 and filter capacitor 4 disconnects.In the handling process of described step S1-S3, increase only step S1a, herein
Different from the 1st embodiment and the 2nd embodiment.
When the electric current of commercial three-phase alternating-current supply 1 is low, the output voltage Va of transformator 2 also can step-down.Now in order to conduct
The brushless DC motor M of load provides lasting electric power, reduces the voltage Vdc of filter capacitor 4, makes filter capacitor 4
Voltage Vdc less than the output voltage Va of transformator 2.
When the voltage Vdc of filter capacitor 4 declines (NO of step S1, the YES of step S4), master control part 20 compares
The voltage Vdc of filter capacitor 4 and the 1st setting value V1 ' (step S1).
The voltage Vdc of filter capacitor 4 is not up to the 1st setting value V1 ' time (NO of step S11), master control part 20
Compare voltage Vdc and the 2nd setting value V2 (step S12) of filter capacitor 4.
The voltage Vdc of filter capacitor 4 is less than (YES of step S12) during 2 setting value V2, and master control part 20 is by nothing
Torque component electric current Iq in induction vector control portion 50 is set as negative value, makes inverter 10 enter regeneration mode (step
S13).After inverter 10 starts regeneration mode, the voltage Vdc of filter capacitor 4 rises, the output frequency F of inverter 10
Slowly reduce.
The output frequency F of inverter 10 is less than when allowing lowest operating frequency Fmin (YES of step S14), master control part
20 regeneration modes stopping inverter 10, make torque component electric current Iq become normal value (step S15) again, control inverter 10
Output moment of torsion (torque component electric current Iq), make the output frequency F of inverter 10 maintain lowest operating frequency Fmin (step
Rapid S16).Then, master control part 20 controls described output moment of torsion, while returning to step S1.
During the output moment of torsion of master control part 20 Sustainable Control inverter 10, the voltage Vdc of filter capacitor 4 declines and is less than and sets
Definite value V1 ' (NO of step S1, the YES of step S4, the YES of step S11).Master control part makes relay 30 obstructed
Electricity (step S17), and output frequency F is maintained at allow lowest operating frequency Fmin (control inverter 10 output
Moment of torsion) (step S18).
As it has been described above, the voltage Vdc of filter capacitor 4 drops to the 1st setting value V1 ', and higher than being used for preventing surge electricity
Minimum amount of voltage that V1 of stream, now relay 30 no power, even if the opening/closing time of relay contacts point 30a postpones, also can
Perfectly prevent surge current.
And, the voltage Vdc of filter capacitor 4 declines and is less than the 2nd setting V2, but higher than the 1st setting value V1 ',
Inverter 10 enters regeneration mode, is made the voltage Vdc of filter capacitor 4 increase, based on setting value by described regenerated energy
V1 ' postpones the input of resistor 3 as far as possible.Thus, it is possible to the power loss reduced in resistor 3, based on setting value
V0 avoids the stopping of inverter 10 as far as possible.
Other effect is with the 1st embodiment.
The explanation of [4] the 4th embodiments
In the present embodiment, judged the load of brushless DC motor M by the change size of the voltage Vdc of filter capacitor 4
Size.
Master control part 20 is by following (21)-(24) means function.
(21), when commercial three-phase alternating-current supply 1 is stablized, try to achieve the voltage of now filter capacitor 4, be designated as normal voltage.Will
Described normal voltage deducts voltage (the detection voltage of the voltage detecting element 21) Vdc of current filter capacitor 4, obtains voltage
Variation delta Vdc.According to above-mentioned normal voltage, try to achieve the voltage Vdc of filter capacitor 4 average electricity within a specified time
Pressure Vdcx.Meansigma methods Vdcx be voltage Vdc in long integrated value, can be tried to achieve 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, for
Light load.Above-mentioned voltage variety Δ Vdc more than formulation amount Δ Vs time, it is believed that payload for exceeding designated value, in bear
Lotus or heavy load.
(23) when voltage (the detection voltage of the voltage detecting element 21) Vdc of filter capacitor 4 is more than 2 setting value V2,
1st control device makes relay 30 do closing motion, closes relay contacts point 30a.
(24) above-mentioned result of determination is light load, and the voltage Vdc of filter capacitor 4 declines, less than the 1st setting value V1 '
(< V2) time, the 2nd control device makes relay 30 do opening operation, and opens relay contacts point 30a.
(25) above-mentioned judged result is middle load or heavy load, and the voltage of filter capacitor 4 declines and is less than the 2nd setting
When being worth the occasion of V2, the 3rd control device makes relay 30 do opening action, and opens relay contacts point 30a.
Other composition is identical with the 1st embodiment.
The control method of master control part 20 is illustrated by the flow chart with reference to Fig. 8.
Meansigma methods Vdcx of the voltage Vdc of filter capacitor 4 is calculated according to the low pass filter in certain time, calculates
Difference between the voltage Vdc of described meansigma methods Vdcx and now filter capacitor 4, obtains voltage variety Δ Vdc (step
Rapid S0).
Then, when the voltage Vdc of filter capacitor 4 rises (YES of step S1), master controller 20 compares filter capacitor
The voltage Vdc and setting V2 (step S2) of device 4.The voltage Vdc of filter capacitor 4 reaches (step during setting V2
The YES of rapid S2), master controller 20 judges to need not worry about surge current, and relay drive signal D is set as high level,
Open transistor 22, make relay contacts point 30a close, resistor 3 is formed short circuit, by resistor 3 from transformator 2 He
Circuitry cuts between filter capacitor 4.
When the voltage Vdc of filter capacitor 4 declines (NO of step S1, the YES of step S4), master controller 20
The above-mentioned voltage variety Δ Vdc tried to achieve is compared (step S5a) with specified amount Δ V.
Δ Vdc is the least for voltage variety, and during not up to specified amount Δ Vs (YES of step S5a), master control part 20
Judge the light load that load is not up to designated value, by voltage Vdc and the 1st setting value V1 of filter capacitor 4 ' compare (step
Rapid S6).Then, the high pressure Vdc of filter capacitor 4 be less than setting value V1 ' time (Yes of step S6), master control part
Relay drive signal D is set as low-level by 20, closes transistor 22, makes relay 30a no power (step S7).
After relay 30 no power, relay contacts point 30a opens, and resistor 3 puts into.
When voltage variety Δ Vdc is higher than specified amount Δ Vs (NO of step S5a), master control part 20 judges that load is
More than middle load and the heavy load of designated value, master control part 20 is by the voltage Vdc of filter capacitor 4 and the 2nd setting value V2 ratio
Relatively (step S8).Then, when the voltage Vdc of filter capacitor 4 is less than 2 setting value V2 (YES of step S8),
Relay drive signal D is set as low-level by master control part 20, closes transistor 22, then by relay 30 attachment removal (step
Rapid S7).Relay attachment removal makes relay contacts point 30a open, and resistor 3 puts into.
As it has been described above, using meansigma methods Vdcx of the voltage Vdc of filter capacitor 4 as normal voltage, gradually try to achieve, calculate
Potential difference variation delta Vdc of the voltage Vdc of described meansigma methods Vdcx and present filter capacitor 4, according to described electricity
Pressure variation delta Vdc judges the size of load, and the light hours use the 1st setting value V1 ' make relay 30 no power, in bear
Ratio the 1st setting value V1 is selected when lotus or heavy load ' high the 2nd setting value V2 is used for relay 30 no power, so will not be subject to
Impact to payload, it is possible to certain prevents surge current.
Other effect is identical with the 1st embodiment, additionally, in described 4th embodiment, by the voltage Vdc's of filter capacitor 4
Supply voltage, as normal voltage, is reduced the voltage Vdc memory before occurring, is then used as normal voltage also by meansigma methods Vdcx
It is feasible.
[5] variation
In above-described embodiment, voltage Vdc during decline uses the 2nd setting value, makes relay no power；Voltage Vdc during rising
Use setting V2, make relay power.It is also possible that 2nd setting value does not do restriction.It is to say, the 2nd setting value is only
It is higher than setting value V1 ', and rationally set according to the either on or off time delay of relay 30 or the consumption amount of power of inverter 10
Fixed.
Additionally, above-described embodiment and variation are merely illustrative, do not limit the range of embodiment.These novelties
Embodiment may be used for other embodiment, without departing from the principle of the present invention, it is convenient to omit, replace and change.These are real
Execute example and their variation, the requirement containing invention and purpose, also contains the scope of the claim of the present invention.
[symbol description]
1 ... three-phase alternating-current supply, 2 ... transformator, 3 ... prevent the resistor (machine of load surface) of surge current, 4 ... filtering
Capacitor, 10 ... inverter, M ... brushless DC motor (load), 11,12,13 ... current inductor, 20 ... master control
Portion processed, 21 ... voltage detecting element, 22 ... NPN transistor, 30 ... relay, 30a ... relay contacts point, 50 ... noninductive
Answer vector control unit.
Claims (6)
1. a power-converting device, it is characterised in that include transformator, filter capacitor, inverter, resistor, relay and
Control method, commercial ac power source is changed into direct current by transformator；Filter capacitor is connected with the outfan of described transformator；Inverse
Becoming device and the voltage of described filter capacitor is changed into alternating voltage, described alternating voltage exports to load as driving electric；Electricity
Resistance device is arranged in the circuit between described transformator and described filter capacitor, is used for preventing surge current；Relay and described electricity
Resistance device is arranged in parallel, and containing having point of contact；When the voltage of described filter capacitor rises and exceedes setting, control device makes institute
Stating relay and do shutoff operation, when the voltage of described filter capacitor declines and is less than setting value, control device makes described relay
Do opening operation；
In order to make the electric current the flowing through described transformator maximum allowed current less than described transformator, described setting value is than described filtered electrical
The minimum amount of voltage that of container is high.
Power-converting device the most according to claim 1, it is characterised in that described setting value is less than described setting, in order to make
Flowing through the electric current of the described transformator maximum allowed current less than described transformator, described setting value contains the 1st setting value and the
2 setting values, described 1st setting value is higher than the described 1st higher than the minimum amount of voltage that of described filter capacitor, described 2nd setting value
Setting value.
Power-converting device the most according to claim 2, it is characterised in that the voltage of described filter capacitor rises and exceedes institute
When stating setting, described control method makes described relay do shutoff operation；
Described payload is not up to setting, and the voltage of described filter capacitor declines and be less than the 1st setting value, described control
Method makes described relay do opening operation；
Described payload exceedes setting, and the voltage of described filter capacitor declines and be less than the 2nd setting value, described controlling party
Method makes described relay do opening operation.
Power-converting device the most according to claim 2, it is characterised in that the voltage of described filter capacitor rises and exceedes institute
When stating setting, described control method makes described relay do closing motion；
Described payload is not up to setting, and the voltage of described filter capacitor declines and be less than the 1st setting value, described control method
Described relay is made to do opening operation；
Described payload exceedes setting, and the voltage of described filter capacitor declines and be less than the 2nd setting value, described inverter defeated
Go out moment of torsion slack-off.
Power-converting device the most according to claim 2, it is characterised in that the voltage of described filter capacitor rises and exceedes institute
When stating setting, described control method makes described relay do shutoff operation；
Described payload exceedes setting, and when the voltage of described filter capacitor declines and is less than 2 setting value, told control
Method starts the regeneration mode of described inverter, when the regeneration mode started makes the output frequency of described inverter less than assigned frequency
Time, described regeneration mode decommissions, and the most described control method controls the output moment of torsion of described inverter, makes described inverter
Output frequency identical with described assigned frequency.
When the voltage of described filter capacitor declines and is less than 1 setting value, described control method makes described relay do opening operation,
And release the control to described output moment of torsion.
6. according to the power-converting device described in claim 3 and 4, it is characterised in that described in when described commercial ac power source is stablized
The voltage of filter capacitor is as normal voltage, using the difference of described normal voltage and the voltage of present filter capacitor as electricity
Pressure variable quantity；
When described voltage variety is less than specified amount, described control method judges that described payload is not up to designated value；
When described voltage variety is higher than specified amount, described control method judges that described payload exceedes designated value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-085396 | 2014-04-17 | ||
| JP2014085396 | 2014-04-17 | ||
| PCT/JP2015/060852 WO2015159760A1 (en) | 2014-04-17 | 2015-04-07 | Power conversion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105874702A true CN105874702A (en) | 2016-08-17 |
| CN105874702B CN105874702B (en) | 2018-10-26 |
Family
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| 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098722A (en) * | 2019-05-06 | 2019-08-06 | 阳光电源股份有限公司 | A kind of switching method, apparatus and system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3379712B1 (en) * | 2015-11-18 | 2020-07-29 | Hitachi Industrial Equipment Systems Co., Ltd. | 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 |
Citations (2)
| 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 |
| JPS63262026A (en) * | 1987-04-16 | 1988-10-28 | 日本電気株式会社 | Ac-dc switching source input voltage monitoring circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63124766A (en) * | 1986-11-13 | 1988-05-28 | Matsushita Electric Ind Co Ltd | Rush current limiting 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 CN CN201580003687.7A patent/CN105874702B/en active Active
- 2015-04-07 JP JP2016513728A patent/JP6255088B2/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
| JPS63262026A (en) * | 1987-04-16 | 1988-10-28 | 日本電気株式会社 | Ac-dc switching source input voltage monitoring circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098722A (en) * | 2019-05-06 | 2019-08-06 | 阳光电源股份有限公司 | A kind of switching method, apparatus and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105874702B (en) | 2018-10-26 |
| WO2015159760A1 (en) | 2015-10-22 |
| JPWO2015159760A1 (en) | 2017-04-13 |
| JP6255088B2 (en) | 2017-12-27 |
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