CN204190628U - A kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device - Google Patents
A kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device Download PDFInfo
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- CN204190628U CN204190628U CN201420597113.XU CN201420597113U CN204190628U CN 204190628 U CN204190628 U CN 204190628U CN 201420597113 U CN201420597113 U CN 201420597113U CN 204190628 U CN204190628 U CN 204190628U
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device, comprise electromagnetic interface filter, the uncontrollable rectification circuit of three-phase bridge, bus capacitor unit, single-phase full bridge SPWM inverter circuit, IGBT drive circuit.Input three-phase alternating voltage by electromagnetic interface filter filtering high-frequency interferencing signal, through the uncontrollable rectification circuit of three-phase bridge be connected to have mild set up and stable busbar voltage, adapt to input voltage amplitude fluctuations, bus capacitor unit that the functions such as busbar voltage are released in power-off fast.The IGBT in single-phase full bridge SPWM inverter circuit is controlled, inverter output frequency and the adjustable single-phase AC voltage of amplitude by IGBT drive circuit.
Description
Technical field
The utility model relates to a kind of variable frequency power supply, is specifically related to a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device.
Background technology
In order to prevent high voltage electric power equip ment emerged in operation insulation fault, before it puts into operation, need to carry out strict AC voltage withstand test.The power frequency withstand test device that conventional adopts, HT testing transformer or power transformer is used to provide AC voltage withstand test voltage, the weight of power supply capacity, transformer and volume are all very large, not only high cost, and a whole set of experimental rig is heavy, not easily carries out test operation at power engineering scene.
Utility model content
The purpose of this utility model is exactly to solve the problem, and proposes a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device.This variable-frequency resonance power source output frequency and all continuously adjustable alternating voltage of amplitude, then boosted by external excitation transformer, produce resonance through high pressure compensation reactor and the series connection of test article equivalent capacity, test article obtains the high voltage needed for withstand voltage test.Whole device has following characteristics: with the power supply of low capacity realize test to jumbo test article, output voltage frequency and amplitude continuously adjustabe, volume and weight reduce, be easy to execute-in-place, cost also effectively reduce.
To achieve these goals, the utility model adopts following technical scheme:
Be applied to a variable-frequency resonance power source for alternating-current voltage resistance test device, be made up of electromagnetic interface filter, the uncontrollable rectification circuit of three-phase bridge, bus capacitor unit and single-phase full bridge SPWM inverter circuit;
Input signal is three-phase alternating voltage, carries out low-pass filtering through electromagnetic interface filter; Carry out rectification by the uncontrollable rectification circuit of three-phase bridge again and obtain direct voltage, be connected to bus capacitor unit; Voltage after bus capacitor cell processing inputs to single-phase full bridge SPWM inverter circuit, and inversion obtains single-phase AC voltage and exports test loop to; IGBT control circuit is adopted to control opening and shutoff of IGBT in described single-phase full bridge SPWM inverter circuit.
Frequency and the amplitude of the alternating voltage of described single-phase full bridge SPWM inverter circuit output are all controlled.
Boosted by the external excitation transformer of single-phase full bridge SPWM inverter circuit in described test loop, high pressure compensation reactor and test article form;
Wherein, single-phase full bridge SPWM inverter circuit output voltage is through the boosting of external excitation transformer, and the high pressure compensation reactor sealed in before exporting test article to, described test article is capacitive element.
Described electromagnetic interface filter, comprising:
Three differential mode capacitors Cx1, Cx2, Cx3 are connected respectively to three-phase input line Lc, Lb, La of input three-phase alternating-current supply;
Common mode inductance L1, the absolute coil identical by three numbers of turn forms, after being serially connected with described differential mode capacitor Cx1, Cx2, Cx3 and input three-phase alternating-current supply three-phase input line Lc, Lb, La intersection point in three-phase input line;
Three differential mode capacitors Cx4, Cx5, Cx6, be star-likely connected to three-phase input line Lc after described common mode inductance L1, Lb, La;
Three common mode capacitance Cy1, Cy2, Cy3, be connected to three-phase input line Lc ＇, the Lb ＇ of the uncontrollable rectification circuit of three-phase bridge, between La ＇ and ground respectively.
Described bus capacitor unit, comprising:
Bus capacitor C8;
Seal in one before bus capacitor and softly open resistance Rt1;
Discharge resistance R1 in parallel after bus capacitor.
The described soft resistance Rt1 that opens adopts negative tempperature coefficient thermistor.
The functions such as busbar voltage that the realization of bus capacitor unit is set up gently and stable busbar voltage, the impact weakening input voltage amplitude fluctuations, power-off are released fast.
The beneficial effects of the utility model are:
The test voltage frequency that variable frequency power supply exports and amplitude continuously adjustabe, and voltage waveform is well undistorted, can meet the requirement of different test article; The capacity of power supply is little, efficiency is high, decreases the volume of a whole set of experimental rig, is easier to carry at the scene in test.
Accompanying drawing explanation
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the circuit diagram of the utility model electromagnetic interface filter;
Fig. 3 is the circuit diagram of the utility model bus capacitor unit;
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
Fig. 1 is the utility model structured flowchart.
Be applied to a variable-frequency resonance power source for alternating-current voltage resistance test device, be made up of electromagnetic interface filter, the uncontrollable rectification circuit of three-phase bridge, bus capacitor unit and single-phase full bridge SPWM inverter circuit; Three-phase alternating voltage is connected to the uncontrollable rectification circuit of three-phase bridge by electromagnetic interface filter, carries out rectification and obtains direct voltage.Be connected to single-phase full bridge SPWM inverter circuit through bus capacitor unit, carry out inversion and obtain single-phase AC voltage.Control opening and shutoff of IGBT in single-phase full bridge SPWM inverter circuit by IGBT drive circuit, make output voltage frequency and amplitude adjustable.
Introduce the circuit working process of the utility model variable-frequency resonance power source below in detail.
Input three-phase alternating voltage be 380V, 50Hz, after connect electromagnetic interface filter.Electromagnetic interface filter is made up of inductance and electric capacity, belongs to low pass filter, has larger inhibition to the interference signal of high frequency.The noise that it not only can effectively suppress AC network to input, improves the antijamming capability of variable-frequency resonance power source; Also the interference produced by variable-frequency resonance power source inside can be suppressed by power line to be transferred to the impact that AC network produces simultaneously.
Fig. 2 is the circuit diagram of the utility model electromagnetic interface filter.
EMI signal comprises differential mode interference signal and common mode interference signal, and therefore electromagnetic interface filter reply differential mode, common mode disturbances all play inhibitory action.Meet three differential mode capacitors Cx1, Cx2, Cx3 after input three-phase alternating-current supply, be used for filtering differential mode interference, these three electric capacity are star-like connection, are connected on three-phase input line La respectively, between Lb, Lc.Common mode inductance L1 is serially connected with between input three-phase alternating-current supply and the uncontrollable rectification circuit of three-phase bridge, and it is made up of the absolute coil that three numbers of turn are identical, is wound on same magnet ring.When there being common mode interference signal flowing through coil, magnetic flux superposes mutually, and after overcoupling, the induction reactance of coil increases, and makes coil show as high impedance, hinders passing through of common mode interference signal.Cx4, Cx5, Cx6 are differential mode capacitor, between the star-like three-phase input line be connected to after common mode inductance L1, are used for filtering differential mode interference.Cy1, Cy2, Cy3 are common mode capacitance, are connected to La ＇, Lb ＇, between Lc ＇ and ground, are used for filtering common mode interference.La ＇, Lb ＇, Lc ＇ input as three-phase, are connected to the uncontrollable rectification circuit of three-phase bridge.
Fig. 3 is the circuit diagram of the utility model bus capacitor unit.
Carry out rectification through the uncontrollable rectification circuit of three-phase bridge, produce the direct voltage that mean value is about 513V.The major function of bus capacitor C8 be as Support Capacitor to maintain the stable of DC bus-bar voltage, make it substantially remain within certain number range.The jumbo electrolytic capacitor of general employing realizes.If lack bus capacitor C8, because the switching device in single-phase full bridge SPWM inverter circuit produces violent curent change in rapid operation process, under the impact of circuit parasitic parameter, DC bus there is very high parasitic electromotive force, fluctuating significantly also appears in the voltage on it, and this variable-frequency resonance power source cannot normally be worked.
When this variable-frequency resonance power source circuit is started working, bus capacitor C8 do not have voltage, if without extra measure, very large impulse current can be produced in circuit, there is the possibility damaging device, therefore before bus capacitor, seal in one softly open resistance Rt1, the soft resistance Rt1 that opens adopts negative tempperature coefficient thermistor.When power supply does not close a floodgate, the resistance of negative tempperature coefficient thermistor is very large.After power supply closes a floodgate, the inflow along with electric current makes thermistor generate heat, and resistance reduces, thus sets up direct voltage gently on bus capacitor C8.
A powerful discharge resistance R1 in parallel in bus capacitor C8 rear end.When the voltage magnitude of input power has fluctuation, bus capacitor C8 carries out discharge and recharge thereupon.As not parallel discharge resistance, charging and discharging currents enters into performance loop by bus capacitor C8, produces interference to the stable operation of circuit.After parallel discharge resistance R1, charging and discharging currents flows through from resistance, can avoid above impact.Meanwhile, when variable-frequency resonance power source power-off quits work, discharge resistance R1 can rapidly by the charge discharging resisting on bus capacitor C8, the personal safety of protection operating maintenance person.
Bus capacitor unit rear end is connected to single-phase full bridge SPWM inverter circuit, and switching device selects IGBT.SPWM signal is opened and shutoff through IGBT drive circuit control IGBT's, the single-phase AC voltage that output frequency and amplitude are all controlled, for the test loop of rear end.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection range of the present utility model.
Claims (6)
1. be applied to a variable-frequency resonance power source for alternating-current voltage resistance test device, it is characterized in that: be made up of electromagnetic interface filter, the uncontrollable rectification circuit of three-phase bridge, bus capacitor unit and single-phase full bridge SPWM inverter circuit;
Input signal is three-phase alternating voltage, carries out low-pass filtering through electromagnetic interface filter; Carry out rectification by the uncontrollable rectification circuit of three-phase bridge again and obtain direct voltage, be connected to bus capacitor unit; Voltage after bus capacitor cell processing inputs to single-phase full bridge SPWM inverter circuit, and inversion obtains single-phase AC voltage and exports test loop to; IGBT control circuit is adopted to control opening and shutoff of IGBT in described single-phase full bridge SPWM inverter circuit.
2. according to a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device according to claim 1, it is characterized in that: frequency and the amplitude of the alternating voltage of described single-phase full bridge SPWM inverter circuit output are all controlled.
3. according to a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device according to claim 1, it is characterized in that: boosted by the external excitation transformer of single-phase full bridge SPWM inverter circuit in described test loop, high pressure compensation reactor and test article form;
Wherein, single-phase full bridge SPWM inverter circuit output voltage is through the boosting of external excitation transformer, and the high pressure compensation reactor sealed in before exporting test article to, described test article is capacitive element.
4., according to a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device according to claim 1, it is characterized in that: described electromagnetic interface filter, comprising:
Three differential mode capacitors Cx1, Cx2, Cx3 are connected respectively to three-phase input line Lc, Lb, La of input three-phase alternating-current supply;
Common mode inductance L1, the absolute coil identical by three numbers of turn forms, after being serially connected with described differential mode capacitor Cx1, Cx2, Cx3 and input three-phase alternating-current supply three-phase input line Lc, Lb, La intersection point in three-phase input line;
Three differential mode capacitors Cx4, Cx5, Cx6, be star-likely connected to three-phase input line Lc after described common mode inductance L1, Lb, La;
Three common mode capacitance Cy1, Cy2, Cy3, be connected to three-phase input line Lc ＇, the Lb ＇ of the uncontrollable rectification circuit of three-phase bridge, between La ＇ and ground respectively.
5. according to a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device according to claim 1, it is characterized in that: described bus capacitor unit, comprising:
Bus capacitor C8;
Seal in one before bus capacitor and softly open resistance Rt1;
Discharge resistance R1 in parallel after bus capacitor.
6. according to a kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device according to claim 5, it is characterized in that: the described soft resistance Rt1 that opens adopts negative tempperature coefficient thermistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420597113.XU CN204190628U (en) | 2014-10-15 | 2014-10-15 | A kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420597113.XU CN204190628U (en) | 2014-10-15 | 2014-10-15 | A kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451449A (en) * | 2016-10-26 | 2017-02-22 | 国网上海市电力公司 | Self-adaptive type multi-stage harmonic isolation device |
| CN107132440A (en) * | 2017-05-23 | 2017-09-05 | 江苏现代电力科技股份有限公司 | A kind of power electronics type reactor performance testing device |
| CN108322060A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of digital program controlled AC power based on PWM controller |
| CN113640559A (en) * | 2021-09-01 | 2021-11-12 | 南京普源电气有限公司 | Frequency conversion voltage regulation power supply for partial discharge measurement test of switch type sine waveform output |
-
2014
- 2014-10-15 CN CN201420597113.XU patent/CN204190628U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451449A (en) * | 2016-10-26 | 2017-02-22 | 国网上海市电力公司 | Self-adaptive type multi-stage harmonic isolation device |
| CN107132440A (en) * | 2017-05-23 | 2017-09-05 | 江苏现代电力科技股份有限公司 | A kind of power electronics type reactor performance testing device |
| CN108322060A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of digital program controlled AC power based on PWM controller |
| CN113640559A (en) * | 2021-09-01 | 2021-11-12 | 南京普源电气有限公司 | Frequency conversion voltage regulation power supply for partial discharge measurement test of switch type sine waveform output |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20181015 |
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| CF01 | Termination of patent right due to non-payment of annual fee |