CN201662604U - Variable-frequency resonance power supply - Google Patents
Variable-frequency resonance power supply Download PDFInfo
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- CN201662604U CN201662604U CN2010201525428U CN201020152542U CN201662604U CN 201662604 U CN201662604 U CN 201662604U CN 2010201525428 U CN2010201525428 U CN 2010201525428U CN 201020152542 U CN201020152542 U CN 201020152542U CN 201662604 U CN201662604 U CN 201662604U
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Abstract
The utility model discloses a variable-frequency resonance power supply comprising a rectifying circuit, a filter circuit, a single-phase full-bridge inverting circuit and an inverting bridge control circuit, wherein three-phase alternating-current input voltage enters the rectifying circuit which controls the three-phase alternating-current input voltage to slowly increase; output voltage of the rectifying circuit is stabilized by the filter circuit, and then input to the single-phase full-bridge inverting circuit; and the inverting bridge control circuit controls the single-phase full-bridge inverting circuit to output square-wave voltage which can be used for conducting on withstand voltage test and discharging test of a test circuit. The variable-frequency resonance power supply has less self local discharging, improves the efficiency and reliability, reduces the weight and volume, has simple and convenient operation and is especially suitable for being used for site tests in the power industry.
Description
Technical field
The utility model relates to electric power withstand voltage test field, relates in particular to a kind of frequency conversion resonance vibration power supply.
Background technology
The test of electric system frequency conversion resonance vibration pressure-proof is a kind of new method and the trend of current high-voltage test, at home and abroad is widely used.Frequency conversion resonance vibration is a resonant mode current filtering circuit, and it can improve the power supply wave shape distortion, to obtain sinusoidal voltage waveform preferably, prevents that effectively the harmonic wave peak value from puncturing the mistake of test specimen.The frequency conversion resonance vibration equipment work is in resonant condition, and its available power supply than low capacity produces the voltage that is equivalent to 30～150 times of power supplies, to carry out the withstand voltage and partial discharge test of test specimen.When the insulating point of test specimen was breakdown, electric current took off humorous immediately, and loop current drops to tens of/one of normal test current rapidly.When flashover breakdown took place, because lose condition of resonance, except that short-circuit current descended immediately, high voltage also disappeared immediately, and electric arc can extinguish.The process of setting up again of the recovery voltage of resonant circuit is very long, is easy to deenergization before reaching flashover voltage once more, so frequency conversion resonance vibration is applicable to the dielectric voltage withstand test of high voltage, jumbo power equipment.
The control mode of the frequency conversion resonance vibration power supply that uses in the frequency conversion resonance experiment device all is based on the variable-frequency power sources sine wave output in the market, in the frequency conversion resonance vibration power supply, one class adopts low-frequency power transistor to form the scheme that linear matrix amplifies network, transistor is operated in the linear amplification district in this scheme, thereby obtain the standard sine wave consistent with signal source, shelf depreciation is very little; Another kind of employing insulated gate polar form power tube (IGBT) is realized power inverter, and by the control mode realization sine wave output of closed loop sinusoid pulse width modulation modulation (SPWM), this class power supply can suppress to export low-order harmonic effectively.
In above-mentioned two schemes, the disadvantage of last scheme has been to use several thousand transistors, and this will make reliability of products and efficient reduce, and be difficult to make the cost height; Back one scheme is because IGBT is operated in the high frequency state, and its shortcoming is to solve the problem that power supply output contains a large amount of higher hamonic waves all the time well, and the power supply shelf depreciation is disturbed very big.
The utility model content
(1) technical matters that will solve
The technical matters that the utility model solved is: how to make frequency conversion resonance vibration power supply self shelf depreciation little, and the cost of this frequency conversion resonance vibration power supply is reduced, efficient improves.
(2) technical scheme
In order to achieve the above object, the utility model proposes a kind of frequency conversion resonance vibration power supply, comprise rectification circuit, filtering circuit, single-phase full bridge inverter circuit and inverter bridge control circuit, the three-phase alternating current input voltage is imported described rectification circuit, described rectification circuit is controlled described three-phase alternating current input voltage and is slowly risen, the output voltage of described rectification circuit is input to described single-phase full bridge inverter circuit after described filtering circuit voltage stabilizing, described inverter bridge control circuit is controlled described single-phase full bridge inverter circuit output square-wave voltage, and described square-wave voltage is used for the withstand voltage test and the partial discharge test of test loop.
Wherein, described frequency conversion resonance vibration power supply also comprises high-end opertaing device, operation display device and voltage measuring apparatus, described voltage measuring apparatus is imported described inverter bridge control circuit with the voltage of described test loop feedback, thereby form closed-loop control to described single-phase full bridge inverter circuit, described high-end opertaing device comprises programmable logic controller (PLC), and described high-end opertaing device carries out exchanges data with the transmission system running state parameter with described inverter bridge control circuit and described operation display device respectively.
Wherein, described frequency conversion resonance vibration power supply also comprises holding circuit, and it comprised current circuit, overvoltage circuit, voltage breakdown circuit, over-temperature circuit.
Wherein, in described single-phase full bridge inverter circuit, described single-phase full bridge comprises two groups of two unit IGBT modules, and described single-phase full bridge inverter circuit is output as the described square-wave voltage of zero symmetry.
Wherein, described inverter bridge control circuit adopts DSP to realize that in conjunction with the form of FPGA described inverter bridge control circuit produces the described IGBT module of PWM Waveform Control and exports described square-wave voltage.
(3) beneficial effect
Technique scheme of the present utility model has following advantage: by inverter bridge control circuit control single-phase full bridge inverter circuit, make the single-phase full bridge inverter circuit be output as square-wave voltage, thereby make frequency conversion resonance vibration power supply self shelf depreciation very little, and make the efficient of this frequency conversion resonance vibration power supply and reliability improve, weight and volume reduces, and easy and simple to handle, be particularly suitable for the power industry site test and use.
Description of drawings
Fig. 1 is the structural representation of frequency conversion resonance vibration power supply of the present utility model;
Fig. 2 is the structural representation of core of the present utility model.
Embodiment
In order to be illustrated more clearly in the technical solution of the utility model, be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model comprises three-phase controllable silicon rectification circuit 2, filtering circuit 3, single-phase full bridge inverter circuit 4, voltage measuring apparatus 8, inverter bridge control circuit 9, high-end opertaing device 10, parts such as operation display device 11, feed circuit 12 and holding circuit (not shown).The alternating current of directly taking from three-phase 380V enters into three-phase controllable silicon rectification circuit 2 through main breaker, these three-phase controllable silicon rectification circuit 2 control three-phase alternating voltages slowly rise, output voltage is connected to single-phase full bridge inverter circuit 4 after filtering circuit 3 voltage stabilizings, by inverter bridge control circuit 9 control single-phase full bridge inverter circuits 4 output square-wave voltages, this square-wave voltage is input to the test loop (by exciting transformer 5, resonance reactor 6, dividing potential drop electric capacity 7 and product to be tested 13 are formed), this output square-wave voltage is input to resonance reactor 6 after exciting transformer 5 boosts, when the natural mode shape of the RLC series loop of forming when the frequency of voltage and resonance reactor 6 and product to be tested 13 is identical, the RLC series loop produces resonance, on electric capacity, produce irregularity of wave form less than 1% sinusoidal voltage, this sinusoidal voltage is used for testing product to be tested 13 (because present embodiment, single-phase full bridge inverter circuit 4 is operated in lower switching frequency (under 20～300Hz), when carrying out partial discharge test, the inevitable interference that produces during switch, can avoid disturbing by producing shelf depreciation (PD) gate-control signal, the time interval of gate-control signal can be provided with according to the actual tests situation).The part of above-mentioned sinusoidal voltage is delivered to inverter bridge control circuit 9 through dividing potential drop electric capacity 7 and tension measuring circuit 8, thereby forms the closed-loop control to single-phase full bridge inverter circuit 4.In the course of work of frequency conversion resonance vibration power supply, holding circuit realizes the overcurrent, overvoltage, discharge breakdown to whole power-supply system, overheated etc. protection (this will describe in detail below).With programmable logic controller (PLC) (PLC) is that the high-end opertaing device 10 of core is interactive bridge, it not only can carry out exchanges data with inverter bridge control circuit 9, and can also communicate by letter the parameter that is provided with in transmission system running state parameter and the operation display device 11 with operation display device 11.Operation display device 11 is the man-machine interfaces between frequency conversion resonance vibration power supply and the operator, the operator can be provided with experiment work pattern, test parameters by operation display device 11, operates display device 11 simultaneously and can show correlation test parameter, various failure message and operation indicating.Feed circuit 12 mainly provide AC380V, AC220V, DC24V, DC15V, ± DC15V and six kinds of power supplys of DC5V use for main circuit (mainly comprising rectification circuit 2, filtering circuit 3, single-phase full bridge inverter circuit 4 and holding circuit), inverter bridge control circuit 9, high-end opertaing device 10, operation display device 11, all kinds of electric signal sensor and driver module.
To describe the course of work of the main circuit and the inverter bridge control circuit 9 of frequency conversion resonance vibration power supply of the present utility model below in detail.
As mentioned above, the main circuit of frequency conversion resonance vibration power supply of the present utility model mainly comprises three-phase controllable silicon rectification circuit 2, filtering circuit 3, single-phase full bridge inverter circuit 4 and holding circuit.The input power supply is directly taken from three-phase 380V AC power; enter three-phase controllable silicon rectification circuit 2 through main breaker with overcurrent and fast tripping protection; become pulsating direct current, pulsating direct current is become level and smooth direct-current power supply single-phase full bridge inverter circuit 4 through filtering circuit 3.Because the condenser capacity of filtering circuit 3 reaches tens thousand of microfarads, directly charging, charging current is very big, may cause the main breaker tripping operation.Therefore open phase angle by the control silicon controlled when just beginning to charge and control suitable charging current, if charging reaches the voltage of regulation, the control phase angle becomes 180 degree, and controllable silicon is worked as normal commutation diode from this time.Controllable silicon is controlled by special-purpose controllable silicon trigger module.Single-phase full bridge inverter circuit 4 is formed single-phase full bridge by two unit IGBT module that two groups of EUPEC produce, and is output as the square-wave voltage of zero symmetry, and its driving is to realize by special IGBT driver module.Holding circuit by cross current circuit, overvoltage circuit, discharge breakdown circuit, circuit such as overheated is formed.Overcurrent protection realizes by the output current of current sensor measurement single-phase full bridge inverter circuit 4; Overvoltage protection is by setting and measuring the output voltage of single-phase full bridge inverter circuit 4 and the trial voltage of product to be tested 13 is realized; The discharge breakdown protection realizes by the trial voltage of measuring product to be tested 13; Overheating protection realizes by the temperature of temperature sensor measurement critical component (mainly being IGBT module and controllable silicon).
Fig. 2 is the structural representation of the core of frequency conversion resonance vibration power supply.Inverter bridge control circuit 9 receives test mission and other various control commands that operation display device 11 sends by communication interface; this inverter bridge control circuit 9 is by hardware structure and control generation pulse-length modulation (PWM) signal (comprise frequency and dutycycle) of DSP in conjunction with FPGA; realization is to the output square-wave voltage amplitude of single-phase full bridge inverter circuit 4 and the control of frequency; and the voltage feedback signal and the various fault-signal of the collection of inversion full-bridge control circuit comprise over-current signal; the overvoltage signal; the discharge breakdown signal; heat alarms etc. are to realize control and the protection to the frequency conversion resonance vibration power-supply system.Inverter bridge control circuit 9 sends to high-end opertaing device 10 with virtual voltage, frequency, output current and voltage modulated than parameters such as (dutycycles) and failure message by communication interface simultaneously.Inverter bridge control circuit 9 is a core with DSP, has built the system of DSP in conjunction with FPGA, comprises power supply, resets, crystal oscillator, JTAG, RS-485 communication interface, external memory storage expansion etc.Inverter bridge control circuit 9 also comprises the collection and the modulation treatment circuit of signals such as trial voltage peak value, variable-frequency power sources output current, three-phase supply, DC bus-bar voltage.The signal that modulation treatment is crossed is delivered to DSP after the A/D conversion, make 9 pairs of single-phase full bridge inverter circuits 4 of inverter bridge control circuit control.
The above only is an embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (5)
1. frequency conversion resonance vibration power supply, it is characterized in that, comprise rectification circuit, filtering circuit, single-phase full bridge inverter circuit and inverter bridge control circuit, the three-phase alternating current input voltage is imported described rectification circuit, described rectification circuit is controlled described three-phase alternating current input voltage and is slowly risen, the output voltage of described rectification circuit is input to described single-phase full bridge inverter circuit after described filtering circuit voltage stabilizing, described inverter bridge control circuit is controlled described single-phase full bridge inverter circuit output square-wave voltage, and described square-wave voltage is used for the withstand voltage test and the partial discharge test of test loop.
2. frequency conversion resonance vibration power supply as claimed in claim 1, it is characterized in that, described frequency conversion resonance vibration power supply also comprises high-end opertaing device, operation display device and voltage measuring apparatus, described voltage measuring apparatus is imported described inverter bridge control circuit with the voltage of described test loop feedback, thereby form closed-loop control to described single-phase full bridge inverter circuit, described high-end opertaing device comprises programmable logic controller (PLC), and described high-end opertaing device carries out exchanges data with the transmission system running state parameter with described inverter bridge control circuit and described operation display device respectively.
3. frequency conversion resonance vibration power supply as claimed in claim 2 is characterized in that, described frequency conversion resonance vibration power supply also comprises holding circuit, and it comprised current circuit, overvoltage circuit, voltage breakdown circuit, over-temperature circuit.
4. frequency conversion resonance vibration power supply as claimed in claim 3 is characterized in that, in described single-phase full bridge inverter circuit, described single-phase full bridge comprises two groups of two unit IGBT modules, and described single-phase full bridge inverter circuit is output as the described square-wave voltage of zero symmetry.
5. frequency conversion resonance vibration power supply as claimed in claim 4 is characterized in that, described inverter bridge control circuit adopts DSP to realize that in conjunction with the form of FPGA described inverter bridge control circuit produces the described IGBT module of PWM Waveform Control and exports described square-wave voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201525428U CN201662604U (en) | 2010-04-02 | 2010-04-02 | Variable-frequency resonance power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201525428U CN201662604U (en) | 2010-04-02 | 2010-04-02 | Variable-frequency resonance power supply |
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| CN201662604U true CN201662604U (en) | 2010-12-01 |
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| CN2010201525428U Expired - Fee Related CN201662604U (en) | 2010-04-02 | 2010-04-02 | Variable-frequency resonance power supply |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065278A (en) * | 2013-03-22 | 2014-09-24 | 佛山市顺德区尚研电子科技有限公司 | Variable frequency power supply |
| CN105190333A (en) * | 2013-03-15 | 2015-12-23 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN106443378A (en) * | 2016-09-21 | 2017-02-22 | 深圳供电局有限公司 | Distribution network equipment AC/DC voltage withstand device |
| CN107607821A (en) * | 2017-10-25 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of controllable middle pressure XLPE cable ageing test apparatus of harmonic content |
| CN107783019A (en) * | 2017-11-21 | 2018-03-09 | 广东电网有限责任公司电力科学研究院 | Induced voltage test device when a kind of three-phase transformer is long |
| CN108427062A (en) * | 2017-02-14 | 2018-08-21 | 丁晓东 | Using the frequency conversion resonance vibration pressure-proof local discharge test device and method of intermittent drive |
| CN109901034A (en) * | 2019-04-02 | 2019-06-18 | 国网陕西省电力公司电力科学研究院 | Power cable local discharge detection device and appraisal procedure based on multi-stag power supply and series resonance |
-
2010
- 2010-04-02 CN CN2010201525428U patent/CN201662604U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105190333A (en) * | 2013-03-15 | 2015-12-23 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN105190333B (en) * | 2013-03-15 | 2020-02-28 | 豪倍公司 | DC high potential insulation breakdown test system and method |
| CN104065278A (en) * | 2013-03-22 | 2014-09-24 | 佛山市顺德区尚研电子科技有限公司 | Variable frequency power supply |
| CN104065278B (en) * | 2013-03-22 | 2017-09-19 | 广东尚研电子科技有限公司 | Variable-frequency power sources |
| CN106443378A (en) * | 2016-09-21 | 2017-02-22 | 深圳供电局有限公司 | Distribution network equipment AC/DC voltage withstand device |
| CN106443378B (en) * | 2016-09-21 | 2023-04-07 | 深圳供电局有限公司 | AC/DC voltage withstand device of distribution network equipment |
| CN108427062A (en) * | 2017-02-14 | 2018-08-21 | 丁晓东 | Using the frequency conversion resonance vibration pressure-proof local discharge test device and method of intermittent drive |
| CN107607821A (en) * | 2017-10-25 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of controllable middle pressure XLPE cable ageing test apparatus of harmonic content |
| CN107783019A (en) * | 2017-11-21 | 2018-03-09 | 广东电网有限责任公司电力科学研究院 | Induced voltage test device when a kind of three-phase transformer is long |
| CN109901034A (en) * | 2019-04-02 | 2019-06-18 | 国网陕西省电力公司电力科学研究院 | Power cable local discharge detection device and appraisal procedure based on multi-stag power supply and series resonance |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20140402 |