CN102857119A - Wideband transform-up detection power supply for current transformers - Google Patents
Wideband transform-up detection power supply for current transformers Download PDFInfo
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- CN102857119A CN102857119A CN 201110184267 CN201110184267A CN102857119A CN 102857119 A CN102857119 A CN 102857119A CN 201110184267 CN201110184267 CN 201110184267 CN 201110184267 A CN201110184267 A CN 201110184267A CN 102857119 A CN102857119 A CN 102857119A
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Abstract
The invention discloses a wideband transform-up detection power supply for current transformers. The wideband transform-up detection power supply comprises a power supply filter, a soft start circuit, a rectifier filter circuit, a power bridge inverter, a double-LC filter circuit and a wideband transform-up transformer. The power supply filter, the soft start circuit, the rectifier filter circuit, the power bridge inverter, the double-LC filter circuit and the wideband transform-up transformer are connected in sequence. During operation, inputted mains supply is connected with the soft start circuit through the power supply filter, and is converted into direct-current power by the rectifier filter circuit which is connected with an output end of the soft start circuit, the input direct-current power is converted into alternating-current modulating wave by the power bridge inverter which is electrically connected with an output end of the rectifier filter circuit, the alternating-current modulating wave is connected with the rectifier filter circuit and is inputted to be converted into alternating-current sine wave voltage by the rectifier filter circuit, the alternating-current sine wave voltage is filtered by the double-LC filter circuit which can control harmonic quantity of output voltage, and the double-LC filter circuit is connected with the wideband transform-up transformer so that input voltage is converted into heavy current to be output. Heavy current is output for single-chip microcomputer digital detection, and output drift is avoided.
Description
Technical field
The present invention relates to a kind of current transformer up-flow and detect power supply, particularly a kind of output high stability sinusoidal wave broadband up-flow detects power supply, be applicable to the instrument transformer laboratory electromagnetic current transducer and high precision electro magnetic-type current transformer device are simulated each harmonic to its harmfulness, the current transformer broadband up-flow of required current source detects power supply when also can be used as current transformer frequency conversion verification, belongs to the power-supply device technical field.
Background technology
In the laboratory, detect individual harmonic current to the harmfulness of electromagnetic current transducer equipment, electromagnetic current transducer equipment is applied individual harmonic current, analyze the parameters such as irregularity of wave form of the generation of electromagnetic current transducer equipment under each harmonic, the highest exportable 51 simulation harmonic currents, detect the frequency conversion strong current generator of the low harmonic content of the necessary proportion wide ranges low distortion of this project, and verification electromagnetic current transducer equipment and error under different frequency, if there is not the generator of large electric current high stability, the current fluctuation that ac current source produces causes that number is beated on tested electromagnetic current transducer equipment and the high accuracy master meter, can not attend school accurately numerical value, for guaranteeing the reading accuracy of detected electromagnetic current transducer equipment and high accuracy standard instrumentation, verification electromagnetic current transducer equipment must adopt the frequency conversion strong current generator of high stability, the applicant's current transformer broadband up-flow detects power supply, the frequency output area is from 30Hz to 2550Hz, electric current exportable 400A also under high-frequency, current stability, can reach in 0.05%, both can satisfy the current source that detects the Harmfulness Caused by Harmonics of electromagnetic current transducer equipment, and also can satisfy the current source as verification electromagnetic current transducer equipment precision.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of output high stability sinusoidal wave broadband up-flow and detects power supply, be applicable to the instrument transformer laboratory electromagnetic current transducer and high precision electro magnetic-type current transformer device are simulated each harmonic to its harmfulness, the current transformer broadband up-flow of required current source detects power supply when also can be used as current transformer frequency conversion verification.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of current transformer broadband up-flow detects power supply, comprises power-supply filter, slow-start circuit, current rectifying and wave filtering circuit, power bridge-type inverter, two LC filter circuit, broadband up-flow transformer; Described power-supply filter, slow-start circuit, current rectifying and wave filtering circuit, power bridge-type inverter, two LC filter circuit, broadband up-flow transformer link to each other successively; During work, with the input electric main through power-supply filter, the power bridge-type inverter that link to each other with the slow-start circuit, be converted to direct current with current rectifying and wave filtering circuit that the output of described slow-start circuit joins, is electrically connected with the output of described current rectifying and wave filtering circuit with the direct current of input convert the ac modulation ripple to, the modulating wave that will input that links to each other with current rectifying and wave filtering circuit converts the AC sine wave voltage to, two LC filter circuits are adopted in filtering, can control the harmonic content of output voltage, linking with the broadband up-flow transformer transfers input voltage to High-current output.
Preferably; Described current transformer broadband up-flow detects power supply, also comprises the single-chip microcomputer treatment circuit, and large electric current is exported in the digital detection of described single-chip microcomputer treatment circuit, prevents output shift.
Technique scheme has following beneficial effect: current transformer broadband up-flow of the present invention detects power supply, the voltage stabilizing sampling point has adopted the feedback of 2 monitorings and different feedback times, adopted the dc bus feedback, the High-current output feedback, High-current output has adopted instantaneous feedback and effective value feedback, the dc bus feedback is improved unstable that power-supply fluctuation brings, unstable when current break eliminated in instantaneous feedback, the effective value feedback is improved current fluctuation under normal circumstances, large electric current is exported in the digital detection of single-chip microcomputer, prevent output shift, as prevent that drift from can compensate automatically, adopt different antihunt means greatly to improve the stability of exporting large electric current.
Description of drawings
Accompanying drawing 1 detects the schematic block circuit diagram of power supply for current transformer up-flow of the present invention;
Accompanying drawing 2 detects the two LC filter circuit figure of power supply for current transformer up-flow of the present invention;
Embodiment
The present invention will be described in detail below in conjunction with accompanying drawing.
Accompanying drawing 1 is that current transformer up-flow of the present invention detects power supply, comprises power-supply filter, slow-start circuit, current rectifying and wave filtering circuit, power bridge-type inverter, two LC filter circuit, broadband up-flow transformer; Described power-supply filter, slow-start circuit, current rectifying and wave filtering circuit, power bridge-type inverter, two LC filter circuit, broadband up-flow transformer are communicated with successively; Power-supply filter establishment power supply input harmonics, the slow-start circuit reduces the filtering charging to the percussion of input power, the alternating current that current rectifying and wave filtering circuit is sent slow-start here is converted to galvanic, the power bridge-type inverter converts the direct current of input to the ac modulation ripple, two filter circuits of falling L convert modulating wave to sinusoidal voltage, the broadband up-flow transformer converts voltage source to large current source, and it is not invention main points of the present invention, at this its operation principle is repeated no more.
This voltage stabilization and current stabilization output-controlling device also comprises DC feedback, described DC feedback be connected to rectifying and wave-filtering and the input of comparison circuit between, with described benchmark control ratio after, adjust the output variable size with the Sine Wave Pulse Width Modulation control connection according to DC bus-bar voltage, its objective is the output pulsation that brings for improving power-supply fluctuation; Described instantaneous feedback be connected to the broadband up-flow transformer and the input of comparison circuit between, with described benchmark control ratio after, adjust the output variable size when suddenly changing when having solved electric current with the Sine Wave Pulse Width Modulation control connection, have the fast advantage of response speed; Described effective value feedback link the broadband up-flow device and the input of comparison circuit between, with described benchmark control ratio after, with the Sine Wave Pulse Width Modulation control connection as a comparison level and smooth feedback adjust the output variable size, have the wide advantage of response range, but for the speed express train neglect to become and the drift of speed super snail is its dead band; Described drift auto-compensation is to be connected between the input of broadband up-flow device and single-chip microcomputer treatment circuit by measuring circuit, described single-chip microcomputer treatment circuit and benchmark control ratio after, with the Sine Wave Pulse Width Modulation control connection as a comparison level and smooth feedback adjust the output variable size; This circuit benchmark is for the last rest point of control benchmark is benchmark, detects the percentage be higher than benchmark or be lower than benchmark and adjusts, and efficiently solves the drift phenomenon of output.
Present embodiment adopts the multi-channel sampling feedback with the voltage stabilization and current stabilization unit, adopts the feedback of different response speeds, and it is unstable to finish the output that forms under the different conditions.Output current will be exceeded about ten times than single feedback regulation unit.
This current transformer up-flow detects power supply, and to have an output harmonic wave little, and described pair of LC filter circuit seen accompanying drawing 2, effectively filtering harmonic wave, utilize K1, the K2 switching changes capacitance, utilizes K1 and K2 to close when low frequency, increases filter capacitor and improves wave distortion; When high frequency, utilize K1 and K2 to disconnect, thereby reduce the no-load loss that filter capacitor reduces power supply, series resonance occurs in the L1 that can effectively stagger again and C1 or L2 and C2, two LC filtering equal secondary filtering, and the different filter capacitor of the different employings of frequency filtering, composition can not frequency filter, can improve waveform and can reduce no-load current again, can reduce again the harmonic content of output current.
Present embodiment adopts the LC filtering of the different frequency of two-way, effectively reduces the output harmonic wave amount, and waveform occurs to adopt the DDS chip, and this mode has the characteristics such as the distortion of sine wave output shape is little, regulating frequency is thin.
Technique scheme has following beneficial effect: current transformer broadband up-flow of the present invention detects power supply, the voltage stabilizing sampling point has adopted the feedback of 2 monitorings and different feedback times, adopted the dc bus feedback, the High-current output feedback, High-current output has adopted instantaneous feedback and effective value feedback, the dc bus feedback is improved unstable that power-supply fluctuation brings, unstable when current break eliminated in instantaneous feedback, the effective value feedback is improved current fluctuation under normal circumstances, large electric current is exported in the digital detection of single-chip microcomputer, prevent output shift, as prevent that drift from can compensate automatically, adopt different antihunt means greatly to improve the stability of exporting large electric current.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics; its purpose is to allow the personage that is familiar with technique can understand content of the present invention and is implemented; can not limit protection scope of the present invention with this; all equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (2)
1. a current transformer broadband up-flow detects power supply, it is characterized in that: comprise power-supply filter, slow-start circuit, current rectifying and wave filtering circuit, power bridge-type inverter, two LC filter circuit, broadband up-flow transformer; Described power-supply filter, slow-start circuit, current rectifying and wave filtering circuit, power bridge-type inverter, two LC filter circuit, broadband up-flow transformer link to each other successively; During work, with the input electric main through power-supply filter, the power bridge-type inverter that link to each other with the slow-start circuit, be converted to direct current with current rectifying and wave filtering circuit that the output of described slow-start circuit joins, is electrically connected with the output of described current rectifying and wave filtering circuit with the direct current of input convert the ac modulation ripple to, the modulating wave that will input that links to each other with current rectifying and wave filtering circuit converts the AC sine wave voltage to, two LC filter circuits are adopted in filtering, can control the harmonic content of output voltage, linking with the broadband up-flow transformer transfers input voltage to High-current output.
2. current transformer broadband up-flow according to claim 1 detects power supply, it is characterized in that: described current transformer broadband up-flow detects power supply, also comprise the single-chip microcomputer treatment circuit, large electric current is exported in the digital detection of described single-chip microcomputer treatment circuit, prevents output shift.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110184267 CN102857119A (en) | 2011-07-01 | 2011-07-01 | Wideband transform-up detection power supply for current transformers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110184267 CN102857119A (en) | 2011-07-01 | 2011-07-01 | Wideband transform-up detection power supply for current transformers |
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| CN102857119A true CN102857119A (en) | 2013-01-02 |
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| CN 201110184267 Pending CN102857119A (en) | 2011-07-01 | 2011-07-01 | Wideband transform-up detection power supply for current transformers |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683999A (en) * | 2013-12-30 | 2014-03-26 | 四川英杰电气股份有限公司 | Grid connected inverter and output filtering method thereof |
| CN103812354A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Broadband strong current generator power supply |
| CN105261202A (en) * | 2015-11-05 | 2016-01-20 | 江苏省电力公司电力科学研究院 | Transmission delay measurement method based on B spline interpolation wavelet singularity detection |
| CN111337744A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer operation energy efficiency and/or loss monitoring device |
| CN113985096A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Mutual inductor wiring recognition device |
-
2011
- 2011-07-01 CN CN 201110184267 patent/CN102857119A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683999A (en) * | 2013-12-30 | 2014-03-26 | 四川英杰电气股份有限公司 | Grid connected inverter and output filtering method thereof |
| CN103683999B (en) * | 2013-12-30 | 2016-04-13 | 四川英杰电气股份有限公司 | Combining inverter and output filter method thereof |
| CN103812354A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Broadband strong current generator power supply |
| CN105261202A (en) * | 2015-11-05 | 2016-01-20 | 江苏省电力公司电力科学研究院 | Transmission delay measurement method based on B spline interpolation wavelet singularity detection |
| CN105261202B (en) * | 2015-11-05 | 2019-03-19 | 江苏省电力公司电力科学研究院 | Transmission delay measurement method based on B-spline interpolating wavelet Singularity detection |
| CN111337744A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer operation energy efficiency and/or loss monitoring device |
| CN113985096A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Mutual inductor wiring recognition device |
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Application publication date: 20130102 |