CN104410264A - Frequency changer inverter bridge start controlling method - Google Patents
Frequency changer inverter bridge start controlling method Download PDFInfo
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- CN104410264A CN104410264A CN201410687701.7A CN201410687701A CN104410264A CN 104410264 A CN104410264 A CN 104410264A CN 201410687701 A CN201410687701 A CN 201410687701A CN 104410264 A CN104410264 A CN 104410264A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 20
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 239000007858 starting material Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/30—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive increase of frequency of supply to primary circuit of motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to frequency changers, aims at the problem that a bootstrap diode and a current-limiting resistance are prone to being damaged due to high instant current peak value during cold start in the prior art and provides a frequency changer inverter bridge start controlling method. The method includes detecting whether voltage of an auxiliary power source is normal or not by a system; if not, continuing waiting, and if yes, detecting whether system working state is normal or not by the system; if not, continuing waiting, and if yes, controlling a switch tube of an inverter half bridge by the system, and enabling a lower bridge arm switch tube to be turned on and an upper bridge arm switch tube to be turned off; charging a bootstrap capacitor by the system, detecting charging state of the bootstrap capacitor, if the bootstrap capacitor is not fully charged, continuing charging, and if not, starting a motor by the system. Pre-charging of the bootstrap capacitor of the frequency changer triphase inverter half bridge is realized, so that impact on a bootstrap circuit when the motor is started is reduced; the circumstance that driving of an upper tube of the inverter half bridge is insufficient when the motor is started is avoided, and reliability of the frequency changer is improved. The frequency changer inverter bridge start controlling method is suitable for frequency changer inverter bridges.
Description
Technical field
The present invention relates to frequency converter, particularly inversion bridge.
Background technology
Usual inversion bridge operating frequency is about ten KHz, when cold starts, operating state is not set up completely, bootstrap capacitor voltage is not set up, and now manage to open on inversion half-bridge, immediate current peak value is higher, easy damage bootstrap diode and current-limiting resistance, simultaneously because bootstrap capacitor voltage is not set up completely, easily cause, at the upper pipe operation irregularity of a period of time inversion half-bridge just started, the damage of bootstrap diode, current-limiting resistance and switching tube when situation is serious, being caused.Because the startup operating state of inversion half-bridge is relevant with the initial angle of motor, therefore randomness is stronger, current way strengthens the surplus of element in boostrap circuit, adopt bootstrap diode and current-limiting resistance that impact resistance is stronger, the method does not fundamentally solve the excessive problem of impulse current.
Summary of the invention
Technical problem to be solved by this invention, provides a kind of inversion bridge to start control method, with solve frequency converter start time, boostrap circuit impulse current is large, pipe operation irregularity on inversion half-bridge, problem that reliability is low.
The present invention solve the technical problem, and the technical scheme of employing is, inversion bridge starts control method, comprises following step:
Step 1: whether each voltage of systems axiol-ogy accessory power supply is normal, if abnormal, continue to wait for, normally then performs step 2;
Step 2: whether systems axiol-ogy working state of system is normal, if abnormal, continue to wait for, normally then performs step 3;
Step 3: the switching tube of Systematical control inversion half-bridge, makes the conducting of lower brachium pontis switching tube, and upper brachium pontis switching tube is closed, and performs step 4;
Step 4: system is charged to bootstrap capacitor, and its charged state is detected, if underfill, continue charging, otherwise system starter motor.
Concrete, in described step 1, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detection driving chip supply power voltage and whether meet power reguirements.
Further, in described step 1, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detection calculations amplifier supply power voltage and whether meet power reguirements.
Further, in described step 1, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detection bias voltage and whether meet power reguirements.
Concrete, in described step 2, whether systems axiol-ogy working state of system is normal, comprises the whether overvoltage of detection system AC-input voltage.
Further, in described step 2, whether systems axiol-ogy working state of system is normal, whether under-voltagely comprises detection system AC-input voltage.
Further, in described step 2, whether systems axiol-ogy working state of system is normal, comprises detection system rotating speed of target and/or frequency whether in Electric Machine Control prescribed limit.
The invention has the beneficial effects as follows, by achieving the precharge of frequency converter three-phase inversion half-bridge bootstrap capacitor, the impact to boostrap circuit when reducing electric motor starting;
Meanwhile, to avoid when electric motor starting powers on pipe on inversion half-bridge and drive not enough, enhance the reliability of frequency converter;
And the present invention only relates to algorithm improvement, cost is low, easily realizes.
Accompanying drawing explanation
Fig. 1 is the structure chart that inversion bridge of the present invention starts the system of control method embodiment;
Fig. 2 is the circuit diagram that inversion bridge of the present invention starts the system of control method embodiment;
Fig. 3 is the algorithm sketch that inversion bridge of the present invention starts the system of control method embodiment;
Fig. 4 is the working-flow figure that inversion bridge of the present invention starts control method embodiment;
Fig. 5 is the driver' s timing logic diagram that inversion bridge of the present invention starts the switching tube of control method embodiment;
Wherein, current-limiting resistance 1, current-limiting resistance 22, current-limiting resistance 33, bootstrap diode 1, bootstrap diode 25, bootstrap diode 6, bootstrap capacitor 1, bootstrap capacitor 28, bootstrap capacitor 39, switching tube 1, switching tube 2 11, switching tube 3 12, switching tube 4 13, switching tube 5 14, switching tube 6 15, current sampling resistor 16, amplifier 17.
Embodiment
Technical scheme of the present invention is described in detail below in conjunction with drawings and Examples:
The present invention is directed to usual inversion bridge operating frequency in prior art is about ten KHz, when cold starts, operating state is not set up completely, bootstrap capacitor voltage is not set up, now manage to open on inversion half-bridge, immediate current peak value is higher, easy damage bootstrap diode and current-limiting resistance, simultaneously because bootstrap capacitor voltage is not set up completely, easily cause the upper pipe operation irregularity at a period of time inversion half-bridge just started, bootstrap diode can be caused when situation is serious, the problem of the damage of current-limiting resistance and switching tube, a kind of inversion bridge is provided to start control method, first, whether each voltage of systems axiol-ogy accessory power supply is normal, if abnormal, continue to wait for, normal then whether systems axiol-ogy working state of system is normal, if abnormal, continue to wait for, normal then the switching tube of Systematical control inversion half-bridge, make the conducting of lower brachium pontis switching tube, upper brachium pontis switching tube is closed, and, system is charged to bootstrap capacitor, and its charged state is detected, if underfill, continue charging, otherwise system starter motor.By achieving the precharge of frequency converter three-phase inversion half-bridge bootstrap capacitor, the impact to boostrap circuit when reducing electric motor starting; Meanwhile, to avoid when electric motor starting powers on pipe on inversion half-bridge and drive not enough, enhance the reliability of frequency converter; And the present invention only relates to algorithm improvement, cost is low, easily realizes.
Embodiment
As shown in Figure 1, friendship usually-straight-ac frequency converter comprises: speed reference input, digitial controller, digital SVPWM control, inverter bridge, controlled motor, testing circuit, A/D conversion and output eight parts.Described reference input provides rotating speed of target; Described testing circuit detects controlled electric machine phase current, and linking number word processor A/D; Described digitial controller connects digital SVPWM control switch pipe and exports; Described digital SVPWM connects controlled motor and exports rotating speed of target.
Described frequency converter particular circuit configurations, as shown in Figure 2, alternating current connects inverter bridge and accessory power supply after rectifying and wave-filtering; Described inverter bridge is made up of switching tube 1, switching tube 2 11, switching tube 3 12, switching tube 4 13, switching tube 5 14 and switching tube 6 15; Described testing circuit is made up of current sampling resistor 16 and amplifier 17; Described A/D conversion, digital SVPWM control algolithm are undertaken by MCU; Described MCU connects drive circuit and drives inverter bridge; Described drive circuit is made up of driving chip and boostrap circuit; Described boostrap circuit is made up of bootstrap diode 1, bootstrap diode 25, bootstrap diode 6, bootstrap capacitor 1, bootstrap capacitor 28, bootstrap capacitor 39, current-limiting resistance 1, current-limiting resistance 22 and current-limiting resistance 33.
Inversion bridge of the present invention starts control method program circuit schematic diagram, as shown in Figure 4.
In step S01, in system, whether the voltage first detecting accessory power supply each several part after single-chip microcomputer powers on is normal, if abnormal, continue to wait for, normally then perform step S02;
Wherein, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detecting driving chip supply power voltage and whether meeting power reguirements; Comprise detection calculations amplifier supply power voltage and whether meet power reguirements; Comprise detection bias voltage and whether meet power reguirements.
In step S02, whether detection system state is normal, if abnormal, continue to wait for, normally then performs step S03;
Wherein, whether detection system state is normal, comprises detection system rotating speed of target and/or frequency whether in Electric Machine Control prescribed limit; The whether overvoltage of detection system AC-input voltage; And whether detection system AC-input voltage is under-voltage; If abnormal, continue to wait for, normally then perform step.
In step S03, then, control the switching tube of inversion half-bridge, make the switching tube 4 13 of lower brachium pontis, switching tube 5 14 and switching tube 6 15 conducting, the switching tube 1 of upper brachium pontis, switching tube 2 11, switching tube 3 12 are closed, and perform step S04;
In step S04, bootstrap capacitor 1, bootstrap capacitor 28 and bootstrap capacitor 39 lower end conducting are to ground, accessory power supply VDD charges through current-limiting resistance 1, current-limiting resistance 22 and current-limiting resistance 33 and bootstrap diode 1, bootstrap diode 25 and bootstrap diode 6 pairs of bootstrap capacitors 1, bootstrap capacitor 28 and bootstrap capacitor 39, if underfill, continue charging, be full of and then performed step S05;
In step S05, start normal starter motor.
The driver' s timing logic of inversion bridge switch pipe as shown in Figure 5.
Concrete single-chip microcomputer implementation algorithm, as shown in Figure 3.Current detection circuit gathers controlled electric machine phase current and changes through A/D, is connected to digital low-pass filtering unit LPF, current signal is fed back to input and produces error signal E (z); Described error signal is connected to delay link through transfer function D (z), SVPWM control unit control switch tubulose state exports motor to; Described A/D conversion, digital low-pass filtering, performance element D (z), delay link, SVPWM control unit state are completed by MCU process; Described performance element D (z) is motor control algorithms, comprising: vector control method, Direct torque method for making; Described delay link has been used for bootstrap capacitor precharge, and motor normally starts rear delay link and is closed.
Claims (7)
1. inversion bridge starts control method, it is characterized in that, comprises following step:
Step 1: whether each voltage of systems axiol-ogy accessory power supply is normal, if abnormal, continue to wait for, normally then performs step 2;
Step 2: whether systems axiol-ogy working state of system is normal, if abnormal, continue to wait for, normally then performs step 3;
Step 3: the switching tube of Systematical control inversion half-bridge, makes the conducting of lower brachium pontis switching tube, and upper brachium pontis switching tube is closed, and performs step 4;
Step 4: system is charged to bootstrap capacitor, and its charged state is detected, if underfill, continue charging, otherwise system starter motor.
2. inversion bridge according to claim 1 starts control method, it is characterized in that, in described step 1, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detection driving chip supply power voltage and whether meets power reguirements.
3. inversion bridge according to claim 2 starts control method, it is characterized in that, in described step 1, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detection calculations amplifier supply power voltage and whether meet power reguirements.
4. the inversion bridge according to Claims 2 or 3 starts control method, it is characterized in that, in described step 1, whether each voltage of systems axiol-ogy accessory power supply is normal, comprises detection bias voltage and whether meet power reguirements.
5. inversion bridge according to claim 1 starts control method, it is characterized in that, in described step 2, whether systems axiol-ogy working state of system is normal, comprises the whether overvoltage of detection system AC-input voltage.
6. inversion bridge according to claim 5 starts control method, it is characterized in that, in described step 2, whether systems axiol-ogy working state of system is normal, whether under-voltagely comprises detection system AC-input voltage.
7. inversion bridge according to claim 5 or 6 starts control method, it is characterized in that, in described step 2, whether systems axiol-ogy working state of system is normal, comprises detection system rotating speed of target and/or frequency whether in Electric Machine Control prescribed limit.
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105391349A (en) * | 2015-10-29 | 2016-03-09 | 四川长虹电器股份有限公司 | Variable frequency controller precharging control method |
CN106788113A (en) * | 2016-12-29 | 2017-05-31 | 深圳市英威腾电气股份有限公司 | A kind of frequency converter and its current-limiting method, system |
CN108667332A (en) * | 2018-05-18 | 2018-10-16 | 海信(山东)空调有限公司 | A kind of variable frequency inverter and its precharge control method and device |
CN109194117A (en) * | 2018-08-27 | 2019-01-11 | 矽力杰半导体技术(杭州)有限公司 | Multiple-channel output power inverter and its control method |
CN110224580A (en) * | 2019-05-09 | 2019-09-10 | 深圳欧陆通电子股份有限公司 | A kind of starting-up method of digital power, boot-strap circuit and digital power |
CN111917284A (en) * | 2019-05-09 | 2020-11-10 | 施密徳豪泽股份公司 | Frequency converter |
CN111987970A (en) * | 2020-09-22 | 2020-11-24 | 福州耀天芯电子有限公司 | Three-phase motor drive circuit |
CN113271013A (en) * | 2021-05-13 | 2021-08-17 | 浪潮商用机器有限公司 | Buck chip drive circuit and Buck chip drive system |
CN113964797A (en) * | 2020-12-04 | 2022-01-21 | 嘉兴丹那赫电子科技有限公司 | Hardware current limiting method and device of frequency converter and storage medium |
EP4290751A4 (en) * | 2021-02-04 | 2024-04-10 | Meidensha Corporation | Control device and control method for power conversion device |
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CN201805353U (en) * | 2010-08-30 | 2011-04-20 | 天津市松正电动科技有限公司 | Pre-charged control circuit |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105391349A (en) * | 2015-10-29 | 2016-03-09 | 四川长虹电器股份有限公司 | Variable frequency controller precharging control method |
CN106788113A (en) * | 2016-12-29 | 2017-05-31 | 深圳市英威腾电气股份有限公司 | A kind of frequency converter and its current-limiting method, system |
CN108667332A (en) * | 2018-05-18 | 2018-10-16 | 海信(山东)空调有限公司 | A kind of variable frequency inverter and its precharge control method and device |
CN109194117A (en) * | 2018-08-27 | 2019-01-11 | 矽力杰半导体技术(杭州)有限公司 | Multiple-channel output power inverter and its control method |
CN110224580A (en) * | 2019-05-09 | 2019-09-10 | 深圳欧陆通电子股份有限公司 | A kind of starting-up method of digital power, boot-strap circuit and digital power |
CN111917284A (en) * | 2019-05-09 | 2020-11-10 | 施密徳豪泽股份公司 | Frequency converter |
CN111987970A (en) * | 2020-09-22 | 2020-11-24 | 福州耀天芯电子有限公司 | Three-phase motor drive circuit |
CN113964797A (en) * | 2020-12-04 | 2022-01-21 | 嘉兴丹那赫电子科技有限公司 | Hardware current limiting method and device of frequency converter and storage medium |
CN113964797B (en) * | 2020-12-04 | 2023-10-03 | 嘉兴丹那赫电子科技有限公司 | Hardware current limiting method and device of frequency converter and storage medium |
EP4290751A4 (en) * | 2021-02-04 | 2024-04-10 | Meidensha Corporation | Control device and control method for power conversion device |
US11973439B2 (en) | 2021-02-04 | 2024-04-30 | Meidensha Corporation | Control device and control method for power conversion device |
CN113271013A (en) * | 2021-05-13 | 2021-08-17 | 浪潮商用机器有限公司 | Buck chip drive circuit and Buck chip drive system |
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Application publication date: 20150311 |