CN102801383B - Alternating current motor driving device with charging function and charging method thereof - Google Patents
Alternating current motor driving device with charging function and charging method thereof Download PDFInfo
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- CN102801383B CN102801383B CN201210327381.5A CN201210327381A CN102801383B CN 102801383 B CN102801383 B CN 102801383B CN 201210327381 A CN201210327381 A CN 201210327381A CN 102801383 B CN102801383 B CN 102801383B
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- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 230000001105 regulatory Effects 0.000 claims abstract 3
- 230000003750 conditioning Effects 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000005755 formation reaction Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000002035 prolonged Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 102100001188 RAD1 Human genes 0.000 description 2
- 108060006872 RAD1 Proteins 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000051 modifying Effects 0.000 description 1
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Abstract
The invention discloses an alternating current motor driving device and a method for charging a capacitor unit. The alternating current motor driving device consists of an alternating current motor, a frequency converter and a master switch, wherein the frequency converter comprises a rectifier, an inverter, an intermediate direct current circuit with a capacitor unit, a control unit for controlling the frequency converter to operate, and a charging device for charging the capacitor unit; the charging device comprises a regulated power supply which is electrically connected with the intermediate direct current circuit and provides constant charging current for the capacitor unit; and the master switch controls the operation of the regulated power supply. The alternating current motor driving device has the beneficial effects that a power supply with adjustable or program control constant current is provided for charging the capacitor unit, the energy consumption is reduced, the high-current sharp pulse in the prior art is eliminated, and the stress of the master switch is reduced, so that the service life of the master switch is prolonged.
Description
Technical field
The present invention relates to a kind of AC motor driving apparatus with charge function, and a kind of method to the capacitor unit charging in the frequency converter of AC motor driving apparatus.
Background technology
For the adjustment of alternating current motor rotating speed or torque, nowadays the most frequently used is exactly the squirrel-cage alternating current motor of Frequency Converter Control, hereinafter referred to as AC motor driving apparatus.
Current modal frequency converter type is voltage-controlled PWM(pulse width modulation), first this frequency converter regulates AC supply voltage, then the capacitor by having high capacitance in intermediate loop filters, to produce constant direct voltage, be reverse into adjustable ac output voltage finally by inverter bridge, the amplitude of pulse contained by this voltage reaches constant intermediate loop direct voltage.
In some applications, such as elevator, AC motor driving apparatus worked without the need to the moment, but must be ready at all times ready, after receiving starting command, can run immediately.The requirement of quick startup is, during device is in holding state, frequency converter must be charged, namely when running status, is connected all the time by control logic unit with alternating-current voltage source.
On the other hand, generally there is requirement to low energy consumption loss, that is in the application of this type of AC motor driving apparatus (may idle state be in time most of), should the stand-by power consumption of driver element is down to minimum.Usually, when holding state, the power of PWM frequency converter consumption provides primarily of the balancing resistor in accessory power supply and intermediate dc loop.The high voltage in intermediate dc loop (this voltage may reach hundreds of volt at normal conveying voltage levvl) is reverse into lower isolation voltage by accessory power supply, such as control logic loop, measuring circuit, 5V and 15V needed for gate driver loop.Such as, in the modern drive unit of 100 kW, the power consumption figure magnitude in this loop of run duration may be 50W.In the standby state, this power consumption may be down to 25W, mainly because cooling fan and gate driver out of service.If still require to keep lower stand-by power consumption, then by closed unnecessary loops such as relays, this scheme increases number of components, thus cost is high.Balancing resistor is used for the series capacitor voltage in balance converter intermediate dc loop.When using modal capacitor type-electrolytic condenser, capacitor must be connected usually.Such as, in the modern drive unit of 100 kW, the balancing resistor power loss order of magnitude may be about 30W.Power loss and drive unit running status have nothing to do.
Summary of the invention
The invention provides a kind of AC motor driving apparatus with charge function, power consumption (particularly the power consumption of balancing resistor) can be reduced, thus overcome existing method Problems existing.
The technical solution adopted for the present invention to solve the technical problems is: a kind of AC motor driving apparatus with charge function, by an alternating current motor, one frequency converter, and one between Alternating Current Power Supply net and frequency converter master switch composition, described frequency converter comprises a rectifier, the inverter of one band gate-controlled switch, the intermediate dc loop of one charged container unit, the control unit that the described frequency converter of one control runs, and one carries out for giving the capacitor unit in described intermediate dc loop the charging device charged, described charging device comprises and being electrically connected with described intermediate dc loop, and provide the adjustment power supply of constant charge current for described capacitor unit, described master switch controls the operation of described adjustment power supply.
Preferably, described adjustment power supply is for providing the power supply of adjustable or program-controlled constant current.
Preferably, described adjustment power supply comprises can provide the direct voltage source of direct voltage for constant current source and Bark type inverter, and a mains switch, the being connected to described direct voltage source fly-wheel diode, that is connected to the positive and negative electrode of described direct current intermediate circuit is connected to the reactor in described intermediate dc loop.
Preferably, described direct voltage source comprises the rectifier circuit be connected with at least two supply voltages.
Preferably, described mains switch with together with the conditioning controller and of the control action ammeter that carries out current measurement be electrically connected.
Present invention further teaches a kind of charging method of AC motor driving apparatus, described AC motor driving apparatus is by an alternating current motor, one frequency converter, and one between Alternating Current Power Supply net and frequency converter master switch composition, described frequency converter comprises a rectifier, the inverter of one band gate-controlled switch, the intermediate dc loop of one charged container unit, the control unit that the described frequency converter of one control runs, and one carries out for giving the capacitor unit in described intermediate dc loop the charging device charged, described charging device comprises and to be electrically connected with described intermediate dc loop and to provide the adjustment power supply of constant charge current for described capacitor unit, the voltage of described capacitor unit is to increase DC charging current level, and electric current is not when reaching the maximum of power supply capacity, and master switch is when being in open position, regulate power supply to run and continue charging, until the voltage in intermediate current loop reaches normal operating voltage value.
Preferably, described frequency converter is when holding state stops, master switch disconnects, the voltage in described intermediate dc loop declines from normal operation voltage level, when the voltage of middle DC loop is reduced to predetermined value, control power source active and constant charge current is provided, making intermediate dc loop voltage remain on predetermined constant voltage level.
Preferably, described adjustment power supply comprises can provide the direct voltage source of direct voltage for constant current source and Bark type inverter, and a mains switch, the being connected to described direct voltage source fly-wheel diode, that is connected to the positive and negative electrode of described direct current intermediate circuit is connected to the reactor in described intermediate dc loop; Described direct voltage source comprises the rectifier circuit be connected with at least two supply voltages; Described mains switch is controlled by conditioning controller, its electric current is measured by ammeter.
Preferably, described conditioning controller measures electric current generation fed-back current signals to filter, and is compared by the reference current signal in fed-back current signals and amplifier, with the signal of the mains switch described in formation control.
Preferably, described conditioning controller forms electric current or power feedback signal for generating described reference current signal.
The invention has the beneficial effects as follows: the reduction of intermediate dc loop voltage increases the change-over time of AC motor driving apparatus from holding state to running status; Rise in the process of normal operating voltage in intermediate dc loop voltage, namely when frequency converter is connected with power supply network or recovers from holding state, regulate power supply to provide the most high charge current in its range of capacity, thus solve the problem of prior art; Can shorten and the accurately predicting charging interval, thus estimate the start-up time of AC motor driving apparatus; Because intermediate dc loop can be charged to full voltage before closed master switch, so constant programmable current source can also provide another voltage, this voltage to be charged the common high input current spike caused by incomplete resistance in charge circuit before can eliminate closed master switch, eliminate big current spike, reduce master switch stress, thus extend the useful life of master switch.
Accompanying drawing explanation
Fig. 1 is the main circuit diagram of prior art AC motor driving apparatus;
Fig. 2 be prior art AC motor driving apparatus startup stage characteristic schematic diagram;
Fig. 3 is the schematic diagram of the preferred embodiment of the present invention;
Fig. 4 is the circuit diagram that the present invention regulates power supply preferred embodiment;
Fig. 5 be AC motor driving apparatus of the present invention startup stage characteristic schematic diagram;
Fig. 6 is the characteristic schematic diagram of AC motor driving apparatus of the present invention at holding state.
Embodiment
Fig. 1 has enumerated the main circuit diagram by the AC motor driving apparatus of Frequency Converter Control.Described AC motor driving apparatus comprises a three-phase alternating current electric wire splicing ear L
1, L
2, L
3; A master switch K
1, charging resistor R
c1, R
c2be parallel between power supply two-phase contact; The rectifier REC be made up of 6 diodes; An intermediate dc loop, the voltage between DC+, DC-pole in this intermediate dc loop is u
dC, this intermediate dc loop by two with balancing resistor R
1, R
2capacitor unit C
1, C
2composition; The inverter INU be made up of 6 gate-controlled switches, such as, with the IGBTs V of parallel connected in reverse phase fly-wheel diode
1v
6, IGBT connects U, V, W generated frequency and the adjustable three-phase alternating current output voltage of amplitude exporting; An alternating current motor M.
Frequency converter also comprises an accessory power supply PS, and as shown in this example, the input power of accessory power supply PS is generally produced by described intermediate dc loop, and accessory power supply PS regeneration boost voltage, just as the U of control unit CU
cU, the U of gate driver GD
gD.In frequency converter, the AC of rectifier REC or DC side also comprise a main current limiting reactor usually.Because this reactor in apparatus of the present invention not necessarily, so Fig. 1 omits reactor.
Fig. 2 shows in Fig. 1 the typical waveform of the intermediate dc loop primary charging of the frequency converter adopting prior art.This figure supposes at time point t
21, alternating-current voltage source and three-phase alternating current electric wire splicing ear L
1, L
2, L
3be connected.Then, line current i
lrise to peak current I fast
lP1, due to capacitor unit C
1, C
2initial and uncharged, therefore, I
lP1by charging resistor R
c1, R
c2restriction.As middle DC loop voltage u
dCduring rising, line current reduces gradually.Because charging process meets indicial response, thus, reaching full direct voltage needs long time, and this is also reach certain voltage levvl U
dC1time, master switch K
1logical normally closed reason.This situation appears at time point t
22, because K
1after closed, there is no main current limiting element in loop, just there will be of short duration high line current pulse I
lP2, make direct voltage quickly charge to terminal level U
dC2, line current remains on full voltage stand-by level I afterwards
sD2, until drive unit is at time point t
23till startup.Since then, line current i
l1determine primarily of motor load.
In order to clearly illustrate apparatus of the present invention principle in Fig. 3, omit parts unnecessary in Fig. 1 main circuit.Intermediate dc loop primarily of comprise a rectifier REC1, one provide constant current I to intermediate dc loop
cadjustment power ps 1 form loop charge.Rectifier REC1 is constituted by a diode, and can be connected to all power supply phases, such as, two-phase power supply shown in figure.In the present invention, as the normal charge resistor R in Fig. 1
c1and R
c2)not necessarily.
Fig. 4 simplification form shows adjustment power ps 1 embodiment of Fig. 3.This adjustment power ps 1 comprises by a mains switch (preferred power field effect pipe V
s), sustained diode
swith a reactor L
sthe Bark type inverter of composition.Mains switch V
sby controller A
1control, adopt resistor R
smeasure source current.The electric current recorded is at controller A
1inner filtration, to produce fed-back current signals I
aCT, this signal and current reference signal I
rEFat amplifier A
2after inside comparing, formation control mains switch V
spWM
rEFcontrol signal.Current reference signal I
rEFformed by the control unit CU of frequency converter.In order to generating reference signal I
rEF, controller A must be provided to the control unit CU of frequency converter
1the electric current of middle formation or power feedback signal FB(, in order to keep digital signal clearly, omit the signal that person skilled in the art knows, the feedback signal as direct voltage in figure).
Fig. 5 shows charge circuit carries out initial charge typical waveform to frequency converter of the present invention.Charging is from time point t
41start, now, power supply (the adjustment power ps 1 in Fig. 3) starts to the intermediate dc tank capacitors unit (C of Fig. 1
1, C
2) constant big current (line current i is provided
lin I
cH), cause voltage summation linearly to increase.At time point t
42, voltage reaches full voltage U
dC2, now, the master switch (K of Fig. 1
1) closed.Before closed, reach full direct voltage, thus eliminate the prior art (I of Fig. 1
lP2) the middle big current spike occurred, and then reduce the stress of master switch contact, its useful life can be extended.At time point t
42afterwards, loop characteristic is similar to Fig. 2.After standby end, the master switch (K in Fig. 3
1) closed, frequency converter will at time point t
43start.
Fig. 6 shows apparatus of the present invention loop characteristic in the standby state.At first, AC motor driving apparatus loads, thus the line current i of drive unit
lreach high load capacity I
l2.Drive unit is at time point t
51stop, the master switch (K of Fig. 1
1) open, the main circuit being that is connected to Alternating Current Power Supply net interrupts.Due to the power consumption of accessory power supply and balancing resistor etc., intermediate dc loop voltage u
dCstart from the horizontal U of initial full voltage
dC2decline.When direct voltage is at time point t
52reach predetermined value U
dC1time, the adjustment power supply (SP1 of Fig. 3) of apparatus of the present invention is activated, and provides low-voltage standby current I to intermediate dc loop
sD1, and make voltage remain on constant U
dC1level.Standby current is directly proportional to direct voltage, that is low-voltage current I
sD1well below full voltage electric current I
sD2.When frequency converter is at time point t
53when restarting, source current increases to another program control level, preferably reaches highest level (I
cHtime line current i
l), fast intermediate dc loop is charged to ceiling voltage level (time point t
54the value reached).Then, master switch closes, and after possible time delay, drive unit is at time point t
55start.
It is emphasized that above is better implementation column of the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (8)
1. there is an AC motor driving apparatus for charge function, by an alternating current motor (M), a frequency converter, and a master switch (K between Alternating Current Power Supply net and frequency converter
1) composition, described frequency converter comprises a rectifier (REC), a band gate-controlled switch (V
1, V
2, V
3, V
4, V
5, V
6, D
1, D
2, D
3, D
4, D
5, D
6) inverter, a charged container unit (C
1, C
2) intermediate dc loop, control the control unit (CU, GD) that described frequency converter runs, and one for giving the capacitor unit (C in described intermediate dc loop
1, C
2) carry out the charging device that charges, it is characterized in that: described charging device comprises and to be electrically connected with described intermediate dc loop and to be described capacitor unit (C
1, C
2) the adjustment power supply (PS1) of constant charge current, described master switch (K are provided
1) control the operation of described adjustment power supply (PS1); Described adjustment power supply (PS1) comprises can provide the direct voltage source of direct voltage for constant current source and Bark type inverter, and the mains switch (V that is connected to described direct voltage source
s), a fly-wheel diode, being connected to the positive and negative electrode of described direct current intermediate circuit is connected to the reactor (L in described intermediate dc loop
s); Described mains switch (V
s) with together with the conditioning controller (A of control action
1) and an ammeter (R carrying out current measurement
s) be electrically connected, described conditioning controller and an amplifier (A
2) be electrically connected.
2. the AC motor driving apparatus with charge function according to claim 1, is characterized in that: described adjustment power supply (PS1) is for providing the power supply of adjustable or program-controlled constant current.
3. the AC motor driving apparatus with charge function according to claim 1, is characterized in that: described direct voltage source comprises the rectifier circuit (REC1) be connected with at least two supply voltages.
4. a charging method for AC motor driving apparatus, described AC motor driving apparatus is by an alternating current motor (M), a frequency converter, and a master switch (K between Alternating Current Power Supply net and frequency converter
1) composition, described frequency converter comprises a rectifier (REC), a band gate-controlled switch (V
1, V
2, V
3, V
4, V
5, V
6, D
1, D
2, D
3, D
4, D
5, D
6) inverter, a charged container unit (C
1, C
2) intermediate dc loop, control the control unit (CU, GD) that described frequency converter runs, and one for giving the capacitor unit (C in described intermediate dc loop
1, C
2) carry out the charging device that charges, it is characterized in that: described charging device comprises and to be electrically connected with described intermediate dc loop and to be described capacitor unit (C
1, C
2) the adjustment power supply (PS1) of constant charge current is provided, the voltage of described capacitor unit (C1, C2) is to increase DC charging current level and electric current does not reach power supply (I
cH) maximum of capacity time, and master switch (K
1) when being in open position, regulating power supply (PS1) to run and continue to charge, until the voltage in intermediate current loop reaches normal operating voltage value (U
dC2).
5. the charging method of AC motor driving apparatus according to claim 4, is characterized in that: described frequency converter when holding state stops, master switch (K
1) disconnect, the voltage (u in described intermediate dc loop
dC) from normal operation voltage level (U
dC2) decline, when the voltage of middle DC loop is reduced to predetermined value (U
dC1) time, control power supply (PS1) and activate and constant charge current (I is provided
sD1), make intermediate dc loop voltage remain on predetermined constant voltage level (U
dC1).
6. the charging method of AC motor driving apparatus according to claim 5, it is characterized in that: described adjustment power supply (PS1) comprises can provide the direct voltage source of direct voltage for constant current source and Bark type inverter, and the mains switch (V that is connected to described direct voltage source
s), a fly-wheel diode, being connected to the positive and negative electrode of described direct current intermediate circuit is connected to the reactor (L in described intermediate dc loop
s); Described direct voltage source comprises the rectifier circuit (REC1) be connected with at least two supply voltages; Described mains switch (V
s) by conditioning controller (A
1) control, its electric current is by ammeter (R
s) measure.
7. the charging method of AC motor driving apparatus according to claim 6, is characterized in that: described conditioning controller (A
1) measure electric current generation fed-back current signals (I to filter
aCT), and by fed-back current signals (I
aCT) and amplifier (A
2) in reference current signal (I
rEF) compare, with the mains switch (V described in formation control
s) signal (PWM
rEF).
8. the charging method of AC motor driving apparatus according to claim 7, is characterized in that: described conditioning controller (A
1) formed for generating described reference current signal (I
rEF) electric current or power feedback signal (FB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327381.5A CN102801383B (en) | 2012-09-07 | 2012-09-07 | Alternating current motor driving device with charging function and charging method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327381.5A CN102801383B (en) | 2012-09-07 | 2012-09-07 | Alternating current motor driving device with charging function and charging method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102801383A CN102801383A (en) | 2012-11-28 |
| CN102801383B true CN102801383B (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210327381.5A Active CN102801383B (en) | 2012-09-07 | 2012-09-07 | Alternating current motor driving device with charging function and charging method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN102801383B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682821A (en) * | 2013-11-29 | 2015-06-03 | 永济新时速电机电器有限责任公司 | Electric driving system for tunnel boring machine and tunnel boring machine |
| CN107015060B (en) * | 2017-03-20 | 2019-04-23 | 西安交通大学 | The AC resistance measurement method and system of transmission pressure |
| CN110710090B (en) * | 2017-07-14 | 2022-01-14 | 丹佛斯电力电子有限公司 | DC link capacitor protection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581565A (en) * | 2004-05-20 | 2005-02-16 | 南京航空航天大学 | Cell management device |
| CN201504218U (en) * | 2009-09-11 | 2010-06-09 | 刘培 | Power-saving frequency converter for elevators |
| CN102431858A (en) * | 2010-09-29 | 2012-05-02 | 株式会社日立制作所 | Elevator system |
| CN202586862U (en) * | 2012-09-07 | 2012-12-05 | 伟肯(苏州)电气传动有限公司 | Alternating current motor drive device with charging function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005162441A (en) * | 2003-12-04 | 2005-06-23 | Mitsubishi Electric Corp | Control device of elevator |
-
2012
- 2012-09-07 CN CN201210327381.5A patent/CN102801383B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581565A (en) * | 2004-05-20 | 2005-02-16 | 南京航空航天大学 | Cell management device |
| CN201504218U (en) * | 2009-09-11 | 2010-06-09 | 刘培 | Power-saving frequency converter for elevators |
| CN102431858A (en) * | 2010-09-29 | 2012-05-02 | 株式会社日立制作所 | Elevator system |
| CN202586862U (en) * | 2012-09-07 | 2012-12-05 | 伟肯(苏州)电气传动有限公司 | Alternating current motor drive device with charging function |
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|---|---|
| CN102801383A (en) | 2012-11-28 |
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| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 215123, 71 Qing Qing Road, Suzhou Park, Jiangsu, China Applicant after: Wai Ken (China) electric drive Co., Ltd. Address before: 215123, 71 Qing Qing Road, Suzhou Park, Jiangsu, China Applicant before: Vacon (suzhou) Drives Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: VACON (SUZHOU) DRIVES CO., LTD. TO: VACON (CHINA) ELECTRIC DRIVE CO., LTD. |
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