CN104362865A - Digital generator frequency converter - Google Patents
Digital generator frequency converter Download PDFInfo
- Publication number
- CN104362865A CN104362865A CN201410741957.1A CN201410741957A CN104362865A CN 104362865 A CN104362865 A CN 104362865A CN 201410741957 A CN201410741957 A CN 201410741957A CN 104362865 A CN104362865 A CN 104362865A
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency converter
- voltage
- generator frequency
- digital generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a digital generator frequency converter. The digital generator frequency converter comprises a three-phase rectifier bridge and a PWM full-bridge inverter; the keys pints are as follows: an energy absorber is connected between the three-phase rectifier bridge and the PWM full-bridge inverter; an inductor L1 and a capacitor C1 are connected in series into a first circuit, and the first circuit is connected in parallel with a capacitor C2 to form the energy absorber. The digital generator frequency converter has no energy loss so that the efficiency of the whole converter cannot be affected; the cost of the energy absorber circuit is extremely low, and therefore, the digital generator frequency converter still has the advantage of very low cost after a bus filter capacitor is omitted; meanwhile, the energy absorber circuit is capable of ensuring that S1-S4 work within a safe voltage range.
Description
Technical field
The present invention relates to a kind of frequency converter of generator.
Background technology
General frequency conversion digital generator, this generator is an explosive motor, a magneto, a frequency converter and generator casing and other auxiliary elements composition. this digital electricity generating is the substitute products of traditional excitation generator, there is power quality high, small in volume, the advantages such as efficiency is high, and noise is low.Wherein the price of frequency converter is higher, and the price that directly results in whole generator is higher.The AC-DC-AC topology of prior art Plays is shown in Fig. 1, electric capacity C2 filtering is had in existing standard circuit, the voltage General Requirements ripple voltage at electric capacity C2 two ends is less than 5%, and this just requires the electric capacity C2 using larger capacity, usually needs multiple Capacitance parallel connection just can meet the demands.Because the voltage on electric capacity is higher, jumbo electric capacity is expensive, and during several Capacitance parallel connection work, temperature is unbalanced, not only uneconomical, and reliability is also poor.
Summary of the invention
The object of this invention is to provide the digital electricity generating frequency converter that a kind of cost is low, the life-span is long.
To achieve these goals, by the following technical solutions:
A kind of digital electricity generating frequency converter, comprise three-phase commutation bridge and PWM full-bridge inverter, it is characterized in that: between three-phase commutation bridge and PWM full-bridge inverter, be connected with acceptor of energy, inductance L 1 and the electric capacity C1 of series connection form the first circuit, and the first circuit and electric capacity C2 in parallel form acceptor of energy.
The inductance L 1 of described first circuit and the resonance frequency of electric capacity C1 are between 0.5 ~ 5 times of input voltage frequency.
Tool of the present invention has the following advantages:
Similar with original Standard Inverter AC-DC-AC circuit, difference is that DC DC bus does not have large electrochemical capacitor filtering, and on DC bus, add an energy absorption circuit, this energy absorption circuit is made up of inductance L 1 and electric capacity C1, electric capacity C2, be used for absorbent insulation grid bipolar transistor switches time the due to voltage spikes that produces, and due to sine wave commutation or the power-factor of load be not 1 time, the peak voltage produced to bus feedback current by the backward diode of igbt.Energy absorption circuit is used for ensureing that busbar voltage is no more than the safe operating voltage of igbt.
The present invention does not have energy loss, does not affect the efficiency of whole product, and the cost of energy absorption circuit is very low, still possesses the advantage of low cost after eliminating bus filter capacitor, can guarantee that S1 ~ S4 is operated within the scope of safe voltage simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of prior art;
Fig. 2 is the physical circuit figure of prior art;
Fig. 3 is the circuit theory diagrams of the embodiment of the present invention 1;
Fig. 4 is the physical circuit figure of the embodiment of the present invention 1;
Fig. 5 be three-phase high-voltage power supply through D1 ~ D6 rectification, obtain the oscillogram of direct voltage of pulsing;
Fig. 6 is after the effect of energy absorption circuit, the oscillogram of busbar voltage;
Fig. 7 is the oscillogram obtained after the voltage after full-bridge inverting;
Fig. 8 is the oscillogram obtaining the sine voltage of low frequency through low pass filter;
Fig. 9 is the electrical schematic diagram of embody rule of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment: as shown in Fig. 3 to Fig. 9, a kind of digital electricity generating frequency converter, comprise three-phase commutation bridge and PWM full-bridge inverter, acceptor of energy is connected with between three-phase commutation bridge and PWM full-bridge inverter, inductance L 1 and the electric capacity C1 of series connection form the first circuit, and the first circuit and electric capacity C2 in parallel form acceptor of energy.The inductance L 1 of the first circuit, the resonance frequency of electric capacity C1 is between 0.5 ~ 5 times of input voltage frequency.
With the Standard Inverter difference shown in Fig. 1 and Fig. 2, the present invention is that DC DC bus does not have large electrochemical capacitor filtering, and on DC bus, add an energy absorption circuit, this energy absorption circuit is made up of inductance L 1 and electric capacity C1, electric capacity C2, be used for absorbent insulation grid bipolar transistor switches time the due to voltage spikes that produces, and due to sine wave commutation or the power-factor of load be not 1 time, the peak voltage produced to bus feedback current by the backward diode of igbt.Energy absorption circuit is used for ensureing that busbar voltage is no more than the safe operating voltage of igbt.
Concrete, petrol engine or Diesel engine drive permanent magnet generator to rotate, and the output three-phase high-voltage power supply of permanent magnet generator and low-tension supply are connected to frequency converter.Its high voltage source is that hundreds of volt and hundreds of hertz are indefinite.Low-tension supply is some tens of volts and hundreds of hertz.High voltage source obtains the busbar voltage of pulsing after rectified three-phase circuit, obtains sinusoidal envelope voltage after PWM full bridge inverter, obtains low-frequency power export through LC low pass filter.The energy absorption circuit that busbar voltage connects is used for absorbing load and LC low pass filter and feeds back to peak voltage on bus, guarantees that busbar voltage is no more than the safe voltage of the switch element in PWM full bridge inverter.Whole circuit is undertaken coordinating and controlling by MCU control unit, the voltage and current size that it is responsible for according to exporting sampling generates suitable pwm signal, go to drive the switch element in PWM full bridge inverter by IGBT drive circuit, make output obtain sine voltage.
Simultaneously low-tension supply voltage stabilizing circuit provides the low-voltage supply of needs for MCU control unit and other circuit, in the product needing to adjust engine speed, also have tacho-pulse shaping circuit to provide tacho-pulse for MCU control unit, and in MCU, generate step motor control pulse, go to drive throttle stepping motor to rotate by stepper motor driving circuit, and then change the rotating speed of engine.
The resonance frequency of the L1 of the first circuit, C1 is between 0.5 ~ 5 times of input voltage frequency.Main the energy absorbed because being fed back to bus when the power-factor of load is not 1 by the backward diode of S1 ~ S4, when resonance frequency is lower than 0.5 times of input voltage frequency, the cost of L1, C1 is higher and lose ground; When higher than 5 times of input voltage frequencies, there will be lasting energy impact when specific loads and cause busbar voltage increase above the withstand voltage limit of S1 ~ S4 and damage.
Claims (2)
1. a digital electricity generating frequency converter, comprise three-phase commutation bridge and PWM full-bridge inverter, it is characterized in that: between three-phase commutation bridge and PWM full-bridge inverter, be connected with acceptor of energy, inductance L 1 and the electric capacity C1 of series connection form the first circuit, and the first circuit and electric capacity C2 in parallel form acceptor of energy.
2. digital electricity generating frequency converter as claimed in claim 1, is characterized in that: the inductance L 1 of described first circuit and the resonance frequency of electric capacity C1 are between 0.5 ~ 5 times of input voltage frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410741957.1A CN104362865A (en) | 2014-12-08 | 2014-12-08 | Digital generator frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410741957.1A CN104362865A (en) | 2014-12-08 | 2014-12-08 | Digital generator frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104362865A true CN104362865A (en) | 2015-02-18 |
Family
ID=52530100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410741957.1A Pending CN104362865A (en) | 2014-12-08 | 2014-12-08 | Digital generator frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104362865A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071623A (en) * | 2019-01-16 | 2019-07-30 | 广东美的制冷设备有限公司 | Drive control circuit, air-conditioner controller and air conditioner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534091B (en) * | 2008-11-19 | 2012-02-08 | 范鑫焱 | Mine flameproof and intrinsic safety type variable frequency speed control device |
| CN102801336A (en) * | 2012-08-28 | 2012-11-28 | 泉州市永裕机械科技有限公司 | Novel inversion type three-phase corona machine |
| US20120307531A1 (en) * | 2011-06-03 | 2012-12-06 | Texas A&M University System | DC Capacitor-less Power Converters |
| CN204244094U (en) * | 2014-12-08 | 2015-04-01 | 重庆瑜欣平瑞电子有限公司 | A kind of digital electricity generating frequency converter |
-
2014
- 2014-12-08 CN CN201410741957.1A patent/CN104362865A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534091B (en) * | 2008-11-19 | 2012-02-08 | 范鑫焱 | Mine flameproof and intrinsic safety type variable frequency speed control device |
| US20120307531A1 (en) * | 2011-06-03 | 2012-12-06 | Texas A&M University System | DC Capacitor-less Power Converters |
| CN102801336A (en) * | 2012-08-28 | 2012-11-28 | 泉州市永裕机械科技有限公司 | Novel inversion type three-phase corona machine |
| CN204244094U (en) * | 2014-12-08 | 2015-04-01 | 重庆瑜欣平瑞电子有限公司 | A kind of digital electricity generating frequency converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071623A (en) * | 2019-01-16 | 2019-07-30 | 广东美的制冷设备有限公司 | Drive control circuit, air-conditioner controller and air conditioner |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150218 |
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| WD01 | Invention patent application deemed withdrawn after publication |