CN202405788U - System energy saver - Google Patents
System energy saver Download PDFInfo
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- CN202405788U CN202405788U CN2011205741539U CN201120574153U CN202405788U CN 202405788 U CN202405788 U CN 202405788U CN 2011205741539 U CN2011205741539 U CN 2011205741539U CN 201120574153 U CN201120574153 U CN 201120574153U CN 202405788 U CN202405788 U CN 202405788U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a system energy saver comprising a transformer of which the primary side winding Rm is connected in series on a major loop between a load and a power network power supply; the output of a non-complementary power AC IGBT (Insulated Gate Bipolar Transistor) chopping module is connected with two ends of the secondary side winding Rb of the transformer, the input of the non-complementary power AC IGBT chopping module is connected with an IGBT driver module; the output of a CPLD (Complex Programmable Logic Device) chip is connected with the IGBT driver module, a precise Hall current sensor and a voltage sensor controlled by the CPLD chip, the primary side of the CPLD chip is connected with the major loop, and the secondary side of the CPLD chip is connected respectively with the first input loop and the second input loop of the CPLD chip through operational amplifiers; the output of a PWM (pulse-width modulation) power switch component is connected with the fourth input loop of the CPLD chip; and the input of a DSP (Digital Signal Processor) single-chip is connected with the precise Hall current sensor, and the output of the DSP singlechip is connected with the third input loop of the CPLD chip, and the DSP single-chip is connected with the PWM power switch component controlled by the DSP singlechip through a control signal. Due to the adoption of the technical scheme of the utility model, better energy saving rates can be achieved in most power utilization places.
Description
Technical field
The utility model relates to electric power system power-saving technique field, relates in particular to a kind of system power saver.
Background technology
In the prior art, centrally connected power supply places such as factory and enterprise, market, office block, station terminal, street lamp are owing to have a large amount of non-linear electrical equipments in circuit; Cause the content of harmonic wave in general supply line higher, harmonic wave not only causes the power waveform distortion, also can make power consumption equipment produce vibrating noise simultaneously; Current in middle wire increases; If exceeded the safe current of center line, will cause center line overheated even blow, cause accident of power supply.Higher Harmonics in Electric Power Network simultaneously also can interference communications, causes the digital device in transducer or the circuit to make a mistake, so harmonic wave is the very big a kind of phenomenon of harm in the circuit.Must suppress or eliminate.
Existing economize on electricity product generally adopts merely from lotus root pressure regulation decompression principle, diverter switch is arranged, diverter switch when load is arranged in main line.Such method is brought impact to electric power system easily, causes the electric power system fault rate high.And this method is merely able to simply have the adjustment voltage on rank, does not have the closed-loop control function, does not have defencive function basically, and the Based Intelligent Control function is poor.Do not have single-phase controlled function yet, harmonic filtration weak effect simultaneously, compensation power factor automatically, own loss is bigger, and power savings is undesirable.
The utility model content
The purpose of the utility model is to propose a kind of system power saver, in order to improve operation of power networks instability, high loss that existing battery saving arrangement brings, the harmonic filtration effect is bad and the problem of compensation network power factor (PF) automatically.
For reaching this purpose, the utility model adopts following technical scheme:
A kind of system power saver comprises:
Transformer, its former limit winding Rm are serially connected between load and the electrical network input power supply on the major loop;
Incomplementarity AC Electric Power IGBT copped wave module, its output are connected the secondary winding Rb two ends of said transformer, and input connects the IGBT driver module;
The CPLD chip, its output connects the IGBT driver module that receives its control;
Accurate Hall current sensor and voltage sensor, former limit is connected with major loop respectively, and secondary connects first, second input circuit of said CPLD chip respectively through operational amplifier;
The pwm power switch element, output connects the 4th input circuit of said CPLD chip;
The DSP single-chip microcomputer, its input connects accurate Hall current sensor, and output connects the 3rd input circuit of said CPLD chip, and connects the pwm power switch element that receives its control through control signal.
The three-phase secondary winding Rb of said transformer major loop is serially connected with auxiliary winding Rf respectively;
Three-phase is assisted winding Rf syndeton triangular in shape, and every auxiliary mutually winding Rf also is connected to power capacitor Cf formation parallel resonance ring.
The said normally opened contact that exchanges IGBT copped wave module and be connected to control switch K, the control utmost point of said control switch K connects the DSP single-chip microcomputer and controlled by it.
Said transformer is positioned at input power supply one end through passive harmonic filter ground connection.
Said transformer is positioned at load one end through passive multistage harmonic filter ground connection.
The technical scheme of the utility model is applicable to most of power utilization environments, all can obtain good electricity-saving effect in most electricity consumptions place.Can effectively improve operation of power networks instability, high loss that existing battery saving arrangement brings, the harmonic filtration effect is bad and the problem of compensation network power factor (PF) automatically.This programme adopts incomplementarity electric power IGBT AC wave chopping technology, and the inductance value of adjusting secondary compensation winding Rb continuously reaches the voltage of adjustment major loop, realizes adjustable magnet controlled voltage regulating technology.The pressure regulation precision is high, and reaction speed is fast, can step-less adjustment.Adding to have with major loop in the tri-phase iron core does not have the auxiliary winding Rf that is electrically connected, and auxiliary winding Rf is parallel with power capacitor Cf, forms resonance loop; Major function is filtering three quintuple harmonicss; The magnetic flux that affords redress simultaneously improves power waveform, suitably improves power factor.In main line, be parallel with passive harmonic filtration circuit simultaneously, can the filtering high order harmonic component, improve power factor.Nonserviceable down, can offer main winding and offset magnetic flux, avoid the main winding heating and the iron core power frequency noise that cause owing to compensation winding open circuit automatically with compensation winding Rb short circuit.
Description of drawings
Fig. 1 is a system power saver system pie graph in the utility model embodiment.
Fig. 2 is the main line structure chart of system power saver in the utility model embodiment.
Fig. 3 is the connection layout of the single-phase main line of system power saver in the utility model embodiment.
Fig. 4 is the electricity-saving appliance main line figure under the system power saver malfunction in the utility model embodiment.
Fig. 5 is a system power saver AC chopping part main circuit schematic diagram in the utility model embodiment.
Fig. 6 is a system power saver AC chopping control section system diagram in the utility model embodiment.
Fig. 7 is the signal graph of each device of system power saver in the utility model embodiment and through the voltage oscillogram behind the AC chopping.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with accompanying drawing and through embodiment.
As shown in Figure 1, be system power saver system pie graph.Be serially connected in the transformer on the major loop between load and the electrical network input power supply comprising former limit winding Rm; The output of incomplementarity AC Electric Power IGBT copped wave module is connected the secondary winding Rb two ends of said transformer, and input connects the IGBT driver module; The output connection of CPLD chip receives the IGBT driver module of its control, accurate Hall current sensor and voltage sensor, and former limit is connected with major loop respectively, and secondary connects first, second input circuit of said CPLD chip respectively through operational amplifier; The output of pwm power switch element connects the 4th input circuit of CPLD chip; The input of DSP single-chip microcomputer connects accurate Hall current sensor, and output connects the 3rd input circuit of said CPLD chip, and connects the pwm power switch element that receives its control through control signal.
The DSP single-chip microcomputer is according to sensor signal control pwm power switch element; Simultaneously through the synthetic sensor signal that collects of CPLD chip; Output control exchanges IGBT copped wave driver module; Realization is accomplished the magnetic control inductance compensation pressure regulation of transformer secondary winding to exchanging the control of IGBT copped wave module output voltage.
Further, exchange IGBT copped wave module and be connected to the normally opened contact of control switch K, the control utmost point of control switch K connects the DSP single-chip microcomputer and controlled by it.
As shown in Figure 2, be the main line structure chart of system power saver.Wherein, the three-phase secondary winding Rb of transformer major loop is serially connected with auxiliary winding Rf respectively, and three-phase is assisted winding Rf syndeton triangular in shape, and every auxiliary mutually winding Rf also is connected to power capacitor Cf formation parallel resonance ring.The electricity-saving appliance Energy-saving coil is wound on the three pillar type volume iron core, the auxiliary winding Rf main line that has adopted the next continuous regulation voltage of the magnetic control coil Rb that can regulate continuously and had filtering three, quintuple harmonics.
As shown in Figure 3, be the connection layout of the single-phase main line of system power saver.Here with single-phase expression, other are identical therewith mutually.Wherein, transformer is positioned at input power supply one end through passive harmonic filter ground connection, is positioned at load one end through passive multistage harmonic filter ground connection.
In like manner, as shown in Figure 4, be the electricity-saving appliance main line figure under the system power saver malfunction.Aspect the protection of electricity-saving appliance self; Except the automatic protection of IGBT driver module, when IGBT breaks down protection, because the compensation winding just is in open-circuit condition at this moment; Therefore the magnetic flux of main winding generation can't be offset in the line, can cause following two phenomenons:
(1) because the existence of main winding self inductance can cause voltage loss, thereby causes oneself power consumption to strengthen, can cause the main winding temperature to raise consumed power.
(2) magnetic flux that main winding produces under the state of compensation winding open circuit can't be offset, so this magnetic flux can form the loop through air and iron core, thereby makes iron core produce vibration, sends the power frequency noise.
For fear of above state, when IGBT broke down, the DSP processing center can be cut off the power supply of AC chopping circuit; The winding of Drive Protecting Circuit short circuit compensation simultaneously; The compensation winding is produced offset magnetic flux, thereby the voltage drop of avoiding main winding to produce can not produce the power frequency noise simultaneously; This moment, the energy-saving device oneself power consumption was very low, and what be merely main winding has load-loss (loss of a self-resistance) output alarm signal simultaneously.
As shown in Figure 5, be system power saver AC chopping part main circuit schematic diagram.The incomplementarity control mode control IGBT copped wave module pressure regulation that the electricity-saving appliance that the utility model provides adopts has voltage, current phase detects; Through high-speed microprocessor to electric current and voltage and operating state continuous monitoring; And have the various control function, can regulate the inductance value that compensates winding Rb by continuous stepless.Thereby regulate the inductance value of main winding Rm continuously, reach the purpose of continuous regulation voltage.Lf, Cf are filter inductance and capacitor.Current controling signal Ik, voltage control signal Uk, pwm signal Ug and switching tube Sl, S2, S3, the operating state of S4 is following.
S1=Uk+Uk*lk*Ug
S2=Uk+Uk*lk*Ug
S3=UK+Uk*Ik*Ug
S4=Uk+Uk*lk*Ug
As shown in Figure 6, be system power saver AC chopping control section system diagram.Adopt even numbers word processing chip TMS320 series DSP to constitute the control core; Has single-phase independent controlled function; Has perfect defencive function; Can set correlation function arbitrarily through LCDs, through 2 32 on the control board or 485 interfaces or carry the GSM communication module and can constitute wired or wireless remote monitering (the platform support need develop software), be applicable to the intelligent energy-saving control system of street lamp.Be parallel with multistage harmonic filtering circuit at output; Because harmonic filtering circuit is at the end of voltage stabilizing output; So its operating state is very stable, the resonance condition change (resonance point of off resonance or offset setting) that changes and make filtering circuit owing to power supply quality can not take place.Because the signal maximum duty cycle of SG3525PWM signal generator is 50%, thus after the model addition that the two-way of SG3525 is opposite as one road PWM model, maximum duty cycle can reach more than 99%.The voltage-regulation scope of compensation on the winding can that is to say from linear adjusting in 0 99% scope, the voltage on the main winding can be U-(0 △ U) scope in smooth adjustment, have the employing dsp chip to control automatically again, so voltage accuracy can reach in 0. 5%.Response time is in 2ms.It is thus clear that owing to adopted the inductance on the linear adjusting compensation of the AC chopping mode winding.Thereby the power supply output quality is significantly improved.Not only can practice thrift a large amount of energy, and supply power voltage stablized, the protection rear end equipment does not receive voltge surge, prolongs service life of equipment.
As shown in Figure 7, for the signal graph of each device of system power saver and through the voltage oscillogram behind the AC chopping.Can find out by output voltage waveform.The envelope of output waveform is perfect sine wave shape figure.It only comprises the high order harmonic component of very small amount.This shows.Voltage waveform through behind the AC chopping is the sine wave of standard, does not have distortion, so power supply quality is able to guarantee.
The system power saver that the utility model provides adopts the pressure regulation of tandem magnetic control inductance compensation, and every have three windings mutually, is respectively main winding Rm, compensation winding Rb and auxiliary winding Rf.Through DSP (TMS320) full-digital circuit power controlling electronic devices and components IGBT (EXB840); The incomplementarity control mode chopper control that employing has voltage, current phase to detect; Guarantee that adjustment voltage does not have jump continuously, can not bring impact to power consumption equipment, to threephase load autobalance three-phase voltage.Owing to adopt compensation voltage control mode, so power controlling only needs ten of actual power/a voltage adjusting range that can satisfy lO%.Phase-detection to electric current and voltage; Adopt the accurate Hall element of band compensation; The rear end as zero-detection circuit, guarantees that AC chopping partly is operated in ZVF (ZVT transition status) through high speed operation amplifier (like UPC series of high speed voltage comparator).The synthetic employing piece of CPLD (like xc9752) of chopping signal obtains required signal.The design of adopting accurate adjustment of numerically controlled voltage and passive filtering winding to close; Front end chopper-control compensation voltage-regulating system partly provides stable operating voltage for passive filtering; Therefore effective simplification circuit, through to supply line's voltage, electric current, the isoparametric detection of harmonic wave, through the real-time calculating of DSP; The power controlling components and parts are offset most of high orders and are called on ripple in adjustment voltage, and simultaneously can the compensation power factor.In three-phase system,, in same iron core, set up the auxiliary winding Rf of triangular closed in order to improve waveform; While The parallel power condenser Cf, this auxiliary winding and main line do not have getting in touch of electricity, and the magnetic contact is only arranged; Should constitute a parallel resonance ring with capacitor by auxiliary winding, and can circulation passage be provided, subdue three quintuple harmonicss common three times and quintuple harmonics in the supply line; Simultaneously can effectively improve voltage current waveform, compensate user's power factor automatically.When electricity-saving appliance breaks down at self, can cut off the power supply of active part automatically, the winding of short circuit compensation simultaneously, assurance supply power voltage can not cause the overexcitation of falling of voltage and iron core because of the open circuit of compensation winding and generate heat.
The utility model adopts digital control mode control electric power components and parts, regulates the current/voltage of control winding through the incomplementarity copped wave that detects electric current and voltage system simultaneously, thereby reaches the inductance value of continuous adjusting main winding.And then regulate output voltage (magnet controlled voltage regulating) continuously, and the utilization voltage of electrical appliance is stabilized in the suitable scope, practice thrift because the power consumption that high voltage brings.Take three-phase independent regulation mode, can accomplish automatic three-phase equilibrium.Reduce current in middle wire, thus the conservation of power loss.Adopt the DSP full-digital control mode; Can accomplish that single-phase control, multi-period switching on and shutting down are controlled automatically, the automatic control of multi-period economize on electricity grade; Functions such as networking control easily; Can combine with background manage software and generalized information system simultaneously (needing the exploitation corresponding software), also have a good application prospect aspect the road lamp energy-saving control.Have passive filtering and parallel-current type active power filtering system simultaneously, can the filtering electric power system in most high order harmonic component, and compensation power factor automatically simultaneously also can be practiced thrift the electric power of consume.
In the utility model, the electricity-saving appliance Energy-saving coil is wound on the three pillar type volume iron core, the auxiliary winding Rf that has adopted the next continuous regulation voltage of the magnetic control coil Rb that can regulate continuously and had filtering three, quintuple harmonics.The incomplementarity control mode control IGBT copped wave module pressure regulation that employing has voltage, current phase to detect; Through high-speed microprocessor to electric current and voltage and operating state continuous monitoring; And have the various control function, can regulate the inductance value that compensates winding Rb by continuous stepless.Regulate the inductance value of main winding Rm continuously, reach the purpose of continuous regulation voltage.
Adopt even numbers word processing chip TMS320 series DSP to constitute the control core; Has single-phase independent controlled function; Has perfect defencive function; Can set correlation function arbitrarily through LCDs, through 2 32 on the control board or 485 interfaces or carry the GSM communication module and can constitute wired or wireless remote monitering (the platform support need develop software), be applicable to the intelligent energy-saving control system of street lamp.Be parallel with multistage harmonic filtering circuit at output; Because harmonic filtering circuit is at the end of voltage stabilizing output; So its operating state is very stable, the resonance condition change (resonance point of off resonance or offset setting) that changes and make filtering circuit owing to power supply quality can not take place.
Because the signal maximum duty cycle of SG3525PWM signal generator is 50%, thus after the model addition that the two-way of SG3525 is opposite as one road PWM model, maximum duty cycle can reach more than 99%.The voltage-regulation scope of compensation on the winding can that is to say from linear adjusting in 0 99% scope, the voltage on the main winding can be U-(0 △ U) scope in smooth adjustment, have the employing dsp chip to control automatically again, so voltage accuracy can reach in 0. 5%.Response time is in 2ms.It is thus clear that owing to adopted the inductance on the linear adjusting compensation of the AC chopping mode winding.Thereby the power supply output quality is significantly improved.Not only can practice thrift a large amount of energy, and supply power voltage stablized, the protection rear end equipment does not receive voltge surge, prolongs service life of equipment.
Since on main circuit coiling the auxiliary winding Rf of the 3rd solution of a triangle.While also is connected to power capacitor, and this major function of putting on the spot provides three times and the path of quintuple harmonics in the iron core, suppresses the overexcitation of iron core, avoids the flat-top distortion of waveform.Through additional should auxiliary winding, can make in the circuit three times, quintuple harmonics reduce more than 50%.Improve wave distortion simultaneously.Except adopting auxiliary winding team three quintuple harmonicss suppress, additional simultaneously have a passive multi-stage filter of LC in electricity-saving appliance.Can the most harmonic wave of filtering.Guarantee the safety of power consumption equipment.Also conservation of power consumption simultaneously.
When IGBT broke down, the DSP processing center can be cut off the power supply of AC chopping circuit, the winding of Drive Protecting Circuit short circuit compensation simultaneously; The compensation winding is produced offset magnetic flux; Thereby the voltage drop of avoiding main winding to produce can not produce the power frequency noise simultaneously, and this moment, the energy-saving device oneself power consumption was very low; What be merely main winding has a load-loss (loss of self-resistance), simultaneously output alarm signal.
Therefore the electricity-saving appliance of this practical proposition combines power electronics control technology, digital control technology, passive filtering technology, improves multiple technologies such as power factor automatically, is applicable to that its main suitable environment of synthesis energy saving (inapplicable high energy consumption enterprise, as smelting industry etc.) of most of power utilization environments is:
1), enterprises such as Ferrous Metallurgy, mine, machining, electronics chemical industry, cement building material;
A. the using electricity system motor load is not high, under the nominal situation less than 70%;
B. the distribution transformer load factor is more than 50%;
C. motor quantity is many, and power is relatively little;
D. supply power voltage three-phase imbalance, the using electricity system electric current changes greatly, and change frequency is fast, three-phase electricity
Stream is uneven;
E. high order harmonic component allocation of distortion severe overweight in the supply network.
The enterprise of above type, comprehensive average power saving rate generally can reach about 8-12%.
2), light industry, labor-intensive enterprises, like cotton spinning, printing and dyeing, clothing, shoemaking, electronics, object for appreciation
Tool etc.;
3), each large, medium and small type market, shopping center, supermarket, hotel, hotel etc.;
4), institutes such as station, harbour, tunnel, parking lot and square, airport, harbour be useful collection
Middle current supply circuit.
5), government bodies, office block, public square, stadiums, bank, hospital, school,
Holiday village, recreation ground and biotope etc.
To 2), 3), 4), 5) etc. the user of type, the electricity-saving appliance that the utility model provides more can be obtained the power savings about 15%.
And the electricity saving of road lamp system that develops to municipal road lamp specially more can obtain the power saving rate more than 25%, can practice thrift a large amount of financial expenses for country.
To sum up; Based on the design concept of the utility model, the model of its digital control module DSP, IBGT, CPLD is not openly limited by the utility model can, can change to some extent with watt level; Use digital control chip power controlling element; Regulate output voltage, the design of control magnetic control inductance pressure regulation should be within the protection range of the utility model.
The above; Be merely the preferable embodiment of the utility model; But the protection range of the utility model is not limited thereto; Anyly be familiar with this technological people in the technical scope that the utility model disclosed, the variation that can expect easily or replacement all should be encompassed within the protection range of the utility model.Therefore, the protection range of the utility model should be as the criterion with the protection range of claim.
Claims (5)
1. a system power saver is characterized in that, comprising:
Transformer, its former limit winding Rm are serially connected between load and the electrical network input power supply on the major loop;
Incomplementarity AC Electric Power IGBT copped wave module, its output are connected the secondary winding Rb two ends of said transformer, and input connects the IGBT driver module;
The CPLD chip, its output connects the IGBT driver module that receives its control;
Accurate Hall current sensor and voltage sensor, former limit is connected with major loop respectively, and secondary connects first, second input circuit of said CPLD chip respectively through operational amplifier;
The pwm power switch element, output connects the 4th input circuit of said CPLD chip;
The DSP single-chip microcomputer, its input connects accurate Hall current sensor, and output connects the 3rd input circuit of said CPLD chip, and connects the pwm power switch element that receives its control through control signal.
2. like the described system power saver of claim l, it is characterized in that the three-phase secondary winding Rb of said transformer major loop is serially connected with auxiliary winding Rf respectively;
Three-phase is assisted winding Rf syndeton triangular in shape, and every auxiliary mutually winding Rf also is connected to power capacitor Cf formation parallel resonance ring.
3. like claim l or 2 described system power savers, it is characterized in that, the said normally opened contact that exchanges IGBT copped wave module and be connected to control switch K, the control utmost point of said control switch K connects the DSP single-chip microcomputer and controlled by it.
4. the system of claim 1 electricity-saving appliance is characterized in that, said transformer is positioned at input power supply one end through passive harmonic filter ground connection.
5. system power saver as claimed in claim 4 is characterized in that, said transformer is positioned at load one end through passive multistage harmonic filter ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205741539U CN202405788U (en) | 2011-12-31 | 2011-12-31 | System energy saver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205741539U CN202405788U (en) | 2011-12-31 | 2011-12-31 | System energy saver |
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| Publication Number | Publication Date |
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| CN202405788U true CN202405788U (en) | 2012-08-29 |
Family
ID=46703405
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205741539U Expired - Fee Related CN202405788U (en) | 2011-12-31 | 2011-12-31 | System energy saver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868170A (en) * | 2012-09-11 | 2013-01-09 | 吴加林 | Single-phase static reactive power compensator based on IGBT (Insulated Gate Bipolar Translator) |
| CN103968984A (en) * | 2014-05-13 | 2014-08-06 | 嘉兴学院 | Self-compensating brushless differential type torque sensor |
| CN104777868A (en) * | 2014-01-09 | 2015-07-15 | 三科电器集团有限公司 | Contactless chopper type voltage regulating circuit |
| CN115602430A (en) * | 2022-12-15 | 2023-01-13 | 清华四川能源互联网研究院（Cn） | Harmonic suppression device and method based on iron core magnetization compensation |
-
2011
- 2011-12-31 CN CN2011205741539U patent/CN202405788U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868170A (en) * | 2012-09-11 | 2013-01-09 | 吴加林 | Single-phase static reactive power compensator based on IGBT (Insulated Gate Bipolar Translator) |
| CN104777868A (en) * | 2014-01-09 | 2015-07-15 | 三科电器集团有限公司 | Contactless chopper type voltage regulating circuit |
| CN103968984A (en) * | 2014-05-13 | 2014-08-06 | 嘉兴学院 | Self-compensating brushless differential type torque sensor |
| CN103968984B (en) * | 2014-05-13 | 2017-01-11 | 嘉兴学院 | Self-compensating brushless differential type torque sensor |
| CN115602430A (en) * | 2022-12-15 | 2023-01-13 | 清华四川能源互联网研究院（Cn） | Harmonic suppression device and method based on iron core magnetization compensation |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20141231 |
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| EXPY | Termination of patent right or utility model |