CN100362727C - Self-activating power device gaining energy from power line magnetic field - Google Patents
Self-activating power device gaining energy from power line magnetic field Download PDFInfo
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- CN100362727C CN100362727C CNB2005100430602A CN200510043060A CN100362727C CN 100362727 C CN100362727 C CN 100362727C CN B2005100430602 A CNB2005100430602 A CN B2005100430602A CN 200510043060 A CN200510043060 A CN 200510043060A CN 100362727 C CN100362727 C CN 100362727C
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Abstract
The invention relates to a self-activate power source which obtains energy from high-energy electric magnetic field, which comprises an energy obtainer and a power source, wherein the energy obtainer is formed by an energy obtaining coil, a peak adsorption capacitor and a choke coil; the power source is formed by rectify circuit, accumulation capacitor or battery, stabilize module, and charge control circuit; the invention can obtain enough energy, without high-voltage sharp impulse to damage the rectify stabilize circuit, to support stable working power source for the separated electric inducer and other high-voltage circuit. The invention has low activate current, wider application and long service life, etc.
Description
Technical field
The invention belongs to the power measurement technical field, relate to a kind of energy feeding device that can be used for providing the steady operation power supply for light insulating electron formula current transformer and other electrical isolation type instrument.
Background technology
In recent years, along with improving constantly of net capacity and electric pressure, adopt the research and development of the electronic current mutual inductor that Optical Fiber Transmission isolates as first and second insulation to be paid much attention at home and abroad, wherein " active formula " current transformer structure especially since the superior function that it had be easy to realize that the characteristics of industrialization obtain the generally approval of industry.But how to obtain the primary side power supply but is to hinder the biggest problem that this technology further develops at present, what domestic and international in the past developer generally adopted is by the method for optical cable to high-pressure side transmission laser energy by low-pressure side, for example external ABB AB and the domestic product that has occurred have all adopted sharp light delivery scheme, the shortcoming that exists in this type of scheme implementation is: 1., the life cycle of lasing light emitter is short, and only 8000～10000 hours; 2., lasing light emitter costs an arm and a leg, half that accounts for the complete machine cost is many; 3., on-site maintenance difficulty is big.Many developers are both at home and abroad arranged for this reason then wish to seek directly to obtain the scheme of energy as the high-pressure side power supply from high voltage bus to be measured magnetic field by electromagnetic induction, for example: " High-Voltage Electrical Appliances " 2004 2 phase paper " energy supply method of active electronic current transformer mesohigh lateral circuit " and " power electronic technology " 2004 7 phase paper " research of electronic current transducer high-pressure side power source design " is the argumentation to this scheme.But because the power line current dynamic range is very big, such scheme still has two technological difficulties when operation, and the first is when primary current during less than 3A, and the power supply of encouraging oneself can not obtain enough energy; It two is to increase to thousands of peaces when above at primary current, the self-excitation power supply is difficult for solving harmful temperature rise and high-pressure sharp pulse device is caused the problem of damage, has therefore hindered the degree that self-excitation source power supply technique enters complete practicality.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, a kind of self-excitation supply unit that obtains energy from power line magnetic field is provided, adopt this device can obtain more energy under the little current field condition, the conversion of volitional check energy under big current condition, and then realize that safety and stability provides the effect of electric energy.
Be used to realize that the technical solution of foregoing invention purpose is such: the self-excitation supply unit that is provided comprises energy taking device and supply unit two parts, wherein: energy taking device can coil by getting, spike absorbs electric capacity, choking-winding is formed, get the energy line snare on power line, its output spike in parallel absorbs electric capacity, and choking-winding is connected on to be got between energy coil output and the supply unit input; Supply unit is made up of rectification circuit, energy storage capacitor or battery, Voltage stabilizing module and charging control circuit, the direct current output of rectification circuit is connected to Voltage stabilizing module and charging control circuit, and energy storage capacitor or battery are connected between charging control circuit output and the Voltage stabilizing module input.In the real work, tightly be enclosed within getting on the high-voltage power line and can directly obtain energy by coil from power line magnetic field, by to get can coil the selection of magnetic core ring framework material, make it to form high as far as possible low-intensity magnetic field induction sensitivity, so that device obtains bigger energy under the little current condition of power line, and can under big current condition, limit the more conversion of multipotency, avoid making circuit overheated; When get can coil magnetic core when being in the magnetic saturation state, high-pressure sharp pulse appears in its output waveform, be parallel to the spike of getting energy coil output and absorb the effect that electric capacity has fast Absorption spike and buffered hf energy, can effectively absorb too high voltages and store the energy of peaked wave, in the spike gap by the choking-winding transmission energy of depositing.Choking-winding selects for use initial permeability less, magnetic material with remarkable hysteresis effect is done skeleton, its inductance value is slightly larger than the inductance value of getting the energy coil, so that it becomes the special inductance with electric current funneling effect, promptly when getting can coil little electric current output, the magnetic core of choking-winding is in the magnetic hysteresis district, so present zero impedance, electric current can be sent into rectification circuit smoothly, when the output current of getting the energy coil increased, the magnetic core of choking-winding entered the dynamic magnetization district, and magnetic permeability increases, thereby induction reactance enlarges markedly, limit big electric current and pass through, impel to get to enter the saturation region by the coil magnetic core, the further conversion of restriction energy; The follow-up connection bridge rectifier of choking-winding, the direct current output of rectification circuit is connected to Voltage stabilizing module; Judge and according to the output voltage remaining of rectification circuit, to energy storage capacitor or battery charge by charging control circuit.
Compared with prior art, the functional structure of self-excitation supply unit of the present invention is reasonable, easy to use, it is little to have excitation current, accommodation is wide, automatically energy storage, safe and reliable, price is low, long service life, avoid characteristics such as maintenance, get less than enough energy during little electric current that this device overcomes effectively that existing self-excitation power supply exists, can't limit excess energy during big electric current and get the high-pressure sharp pulse that produces when can coil saturated, for the high-pressure side circuit of light insulating electron formula current transformer and other electrical isolation type instrument provides stable working power problems such as regulator rectifier circuit damage.The present invention can replace complicated and expensive low-pressure side laser energy feeding device with the high pressure side-draw, has simplified the architecture of active electronic current transformer, increases reliability and useful life, compares with sharp light delivery formula structure, and it is over half to reduce the complete machine cost.
Description of drawings
Fig. 1 is the circuit theory diagrams of a specific embodiment structure of the present invention.
Fig. 2 is a magnetization curve comparison diagram of getting energy coil and choking-winding magnetic core.
Embodiment
Referring to Fig. 1, the self-excitation supply unit that obtains energy from power line magnetic field of the present invention comprises energy taking device and supply unit two parts, wherein energy taking device is formed by getting energy coil 1, spike absorption electric capacity 2 and choking-winding 3, and supply unit is made up of rectification circuit 4, energy storage capacitor or battery 5, Voltage stabilizing module 6 and charging control circuit 7.
Get and can coil 1 be enclosed within on the power line P, select high as far as possible initial permeability for use and have low saturation flux amount soft magnetic core ring do skeleton (for example can select for use initial permeability greater than 80000Gs/0e and saturation flux amount less than 2.5 * 10
-1The soft magnetic material of weber is made) get energy sensitivity and less saturation energy conversion so that form high as far as possible magnetic field.In embodiment illustrated in fig. 1, get the iron-based crystallite magnetic core ring that energy coil 1 skeleton adopts internal diameter 60mm, external diameter 80mm, thick 20mm, get the energy coil with Φ 0.5mm enamelled wire even promptly becoming on the magnetic core ring around 75 circles, power line P passes from the ring heart during installation, if multiturn back and forth passes, then get and effect to be directly proportional with the punching number of turn.
Get the output serial connection choking-winding 3 of energy coil 1, choking-winding 3 selects for use initial permeability magnetic material less and that have a remarkable hysteresis effect to do skeleton (for example can select for use initial permeability to make greater than the magnetic material of 30A/m less than the coercive force of 1000Gs/Oe), its inductance value is slightly larger than the inductance value of getting energy coil 1, so that it becomes the special inductance with electric current funneling effect.In technical solution of the present invention, get that can coil 1 cooperate the electric current funneling effect of formation with choking-winding 3 be the new ideas that the present invention forms, below with reference to accompanying drawing 2 it is further specified: among Fig. 2 label 8 be get can coil 1 magnetization curve, be characterized in that magnetic induction density B is little with fast, the saturated magnetic strength of variation rising of magnetic field intensity H; And that the magnetization curve 9 of choking-winding 3 rises is slow, obvious hysteresis is arranged, saturated magnetic strength is big, this has just formed following electric characteristic: 1., when power line current is very little (I district among the figure, be the leakage current district), because it is higher to get the initial permeability of energy coil 1, can obtain more energy, and choking-winding 3 is in the magnetic hysteresis district, and its induction reactance is almost nil, and this low discharge that is equivalent to funnel does not hinder the characteristics of passing through; 2., when power line current is big (II district, i.e. restricted zone among the figure), get can coil 1 output current also increase thereupon, choking-winding 3 enters high magnetic conductance district, the induction reactance increase is equivalent to the metering function of funnel to big flow; 3., (III district among the figure when power line current further increases, be the saturation region), get and can enter the magnetic saturation attitude prior to choking-winding 3 by coil 1, getting will no longer increase, and because the inductance value of choking-winding 3 can coil 1 greater than getting, so can stop effectively that the high pressure spike enters subsequent conditioning circuit.
In the embodiment shown in fig. 1, choking-winding 3 iron cores adopt the common cold-reduced silicon sheet circle the ribbon of internal diameter 32mm, external diameter 55mm, thick 20mm to make, with Φ 0.5mm enamelled wire two-wire and promptly become two symmetric coil on the magnetic core ring around 50～75 circles, arbitrary group of different name end of two coils can coil 1 be connected with getting as input, and another group different name end is that output links to each other with rectification circuit 4.
Following table has been enumerated iron based nano crystal and cold-reduced silicon sheet one group typical case's magnetic parameter, can adjust selected parameter as required in the use so that the funnel circuit obtain different get can and current limitation effect.
| Core material | Initial permeability Gs/Oe | Maximum permeability Gs/Oe | Saturated magnetic strength (T) | Coercive force A/m |
| Iron based nano crystal | 80000 | ?600000 | ?1.25 | ＜2 |
| Cold-reduced silicon sheet | 1000 | ?40000 | ?2.3 | ＞30 |
Spike absorption electric capacity 2 is connected in parallel on gets energy coil 1 output, adopting capacitance is 0.1～0.47 μ F, the withstand voltage high speed electric capacity (the perhaps noninductive electric capacity of magnetic dielectric) greater than 400V, so that have fast Absorption spike and buffered hf energy, when the magnetic core of getting energy coil 1 is in the magnetic saturation attitude, high-pressure sharp pulse appears in its output waveform, spike in parallel absorbs the energy that electric capacity 2 can effectively absorb too high voltages and store peaked wave, transmits the energy of depositing in the spike gap by choking-winding 3.
Rectification circuit 4 adopts general four end rectifying bridge type circuit to get final product.
Energy storage capacitor or battery 5 can be selected for use with the length of time according to continuous.
After above canonical parameter installation connection, its self-excitation power supply is got and can effect be roughly: when power line current greater than 0.8A, the output of Voltage stabilizing module 6 is greater than 20mW, power line current increases to 5000A even when higher, the self-excitation power limitations is got and can be not more than 150mW, no heater element, continous-stable work all the year round.
Claims (2)
1. self-excitation supply unit that obtains energy from power line magnetic field, comprise energy taking device and supply unit two parts, it is characterized in that: energy taking device can coil (1) by getting, spike absorbs electric capacity (2), choking-winding (3) is formed, get and to be enclosed within on the power line (P) by coil (1), its output spike in parallel absorbs electric capacity (2), and choking-winding (3) is connected on to be got between energy coil (1) output and the supply unit input; Supply unit is made up of rectification circuit (4), energy storage capacitor or battery (5), Voltage stabilizing module (6) and charging control circuit (7), the direct current output of rectification circuit (4) is connected to Voltage stabilizing module (6) and charging control circuit (7), and energy storage capacitor or battery (5) are connected between charging control circuit (7) output and Voltage stabilizing module (6) input.
2. self-excitation supply unit according to claim 1, it is characterized in that: charging control circuit (7) is made up of divider resistance (R1, R2), switch triode (T) and fly-wheel diode (D), divider resistance (R1, R2) is connected the dc output end of rectification circuit (4), the setting voltage end of the sampling input termination divider resistance of switch triode (T), the output control terminal of switch triode (T) connects energy storage capacitor or battery (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100430602A CN100362727C (en) | 2005-08-05 | 2005-08-05 | Self-activating power device gaining energy from power line magnetic field |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100430602A CN100362727C (en) | 2005-08-05 | 2005-08-05 | Self-activating power device gaining energy from power line magnetic field |
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| CN1909327A CN1909327A (en) | 2007-02-07 |
| CN100362727C true CN100362727C (en) | 2008-01-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011085517A1 (en) * | 2010-01-13 | 2011-07-21 | 西安华伟光电技术有限公司 | Electronic current transformer based on complete self-excitation power supply |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860084B (en) * | 2010-05-31 | 2012-09-05 | 北京交通大学 | Power supply source of high-voltage side measuring system |
| CN101888121B (en) * | 2010-06-09 | 2012-07-04 | 重庆大学 | Energy acquisition and power supply management device of current transformer of overhead line |
| CN102005933A (en) * | 2010-11-23 | 2011-04-06 | 中国科学院电工研究所 | On-line energy acquisition device of automatic transformation winding based on current transformer (CT) |
| CN102780273A (en) * | 2012-07-11 | 2012-11-14 | 华北电力大学 | High-voltage wire magnetic field induction energy taking device for high-voltage transmission line online monitoring |
| CN103730947A (en) * | 2013-12-04 | 2014-04-16 | 国家电网公司 | Hybrid type high voltage terminal energy supply system |
| CN104319910B (en) * | 2014-11-06 | 2017-07-14 | 国家电网公司 | A kind of power supply based on ultra-high-tension power transmission line takes can circuit |
| CN110266064A (en) * | 2019-06-28 | 2019-09-20 | 厦门四信通信科技有限公司 | A kind of low current takes can circuit and electrical equipment |
| CN113933630A (en) * | 2021-10-12 | 2022-01-14 | 全球能源互联网欧洲研究院 | Measuring method and device for embedded sensor of converter valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2556835Y (en) * | 2002-06-10 | 2003-06-18 | 西安佳源技术贸易发展有限责任公司 | Low-voltage power supply capabel of obtaining energy from high-voltage line |
| JP2003257686A (en) * | 2002-02-28 | 2003-09-12 | Taguma Kogyo Kk | High pressure discharge lamp lighting device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003257686A (en) * | 2002-02-28 | 2003-09-12 | Taguma Kogyo Kk | High pressure discharge lamp lighting device |
| CN2556835Y (en) * | 2002-06-10 | 2003-06-18 | 西安佳源技术贸易发展有限责任公司 | Low-voltage power supply capabel of obtaining energy from high-voltage line |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011085517A1 (en) * | 2010-01-13 | 2011-07-21 | 西安华伟光电技术有限公司 | Electronic current transformer based on complete self-excitation power supply |
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