CN101397674B - Intelligent full-bridge soft-switching potentiostat - Google Patents
Intelligent full-bridge soft-switching potentiostat Download PDFInfo
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- CN101397674B CN101397674B CN2008101579800A CN200810157980A CN101397674B CN 101397674 B CN101397674 B CN 101397674B CN 2008101579800 A CN2008101579800 A CN 2008101579800A CN 200810157980 A CN200810157980 A CN 200810157980A CN 101397674 B CN101397674 B CN 101397674B
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Abstract
The invention relates to an intellectual full bridge soft switching potentiostat, pertaining to the technical field of corrosion and protection. The input end of an AC rectification circuit is connected with an AC input power and the output end thereof is communicated with an AC filter circuit; the output end of the AC filter circuit, a soft switching circuit, a pulse phase shifting control drive circuit and the input port of a high frequency transformer are respectively electrically communicated with a full bridge converter schematically; the output end of the high frequency transformer is in butt-joint with the input end of a high frequency rectification filter circuit, and the output end of the high frequency rectification filter circuit outputs DC power; the pulse phase shifting control drive circuit is composed of a reference electrode separation amplification circuit, a phase shift controller, a switch valve drive circuit, a signal comparison control circuit, a liquid-crystal display and a keying circuit as well as a monolithic system which are communicated electrically. The whole machine is characterized by novel structure and principle, simple principle, small product volume and light weight, low preparation cost and convenient application and operation and energy saving.
Description
Technical field:
The invention belongs to the corrosion and protection technical field, relate to a kind of impressed current catholic protection device, particularly a kind of intelligent full-bridge soft-switching potentiostat.
Background technology:
The potentiostat equipment that is applied to impressed current cathodic protection systems such as boats and ships, harbor work's facility, oceanographic engineering and buried pipeline at present generally is based on silicon controlled rectifier and magneticsaturation Flow varying power supply.In the middle low power scope, there are shortcomings such as know-why is backward, volume and weight is big, efficient is low, cost height in existing potentiostat equipment; Existing minority manufacturer is releasing the switched attenuator switched-mode potentiostat equipment or the product of own development and design, and this series products generally adopts conventional switch power supply topologies and control mode, and the power loss of switch device is bigger.Because switch power supply control theory, technology and power device develop rapidly in recent years, some electron device manufacturers have newly released device for power switching of new generation and highly integrated control chip again, these devices are more suitable for the realization of some comparatively ideal control theories and method, have improved the switch power supply overall performance; These technology and device or are promoted gradually in field of switch power, but the potentiostat device adopts the widespread use advance ratio of above-mentioned technology and device to lag behind, and its effect device obvious or application success yet there are no open report.Particularly adopt such control device and power device, realize the soft switching process of power device, reduce switching loss, the potentiostat device that reaches predetermined control precision and effect does not see that the commercially available prod is arranged.
Summary of the invention:
The objective of the invention is to overcome deficiency and the shortcoming that traditional potentiostat exists; the present invention adopts the leading technology of field of switch power; a kind of intelligent switch potentiostat product that is applicable to the impressed current cathodic protection field of design and manufacture is with the effect that realizes reducing the products production cost, raising the efficiency, cut down the consumption of energy, reduce small product size and weight.
To achieve these goals; loop of power circuit of the present invention adopts the full-bridge soft-switching structure; control method is the control of pulse phase-shifting full-bridge; power device is selected igbt (IGBT) for use; control chip adopts extensive integrated manipulator; realize that effectively the switch power supply state-of-the-art technology is in impressed current cathodic protection field expanded application problem; the advantage that had both possessed the switch power supply state-of-the-art technology; take into account impressed current cathodic protection again to the requirement of potentiostat parameter control, effectively raise the stability of protection potential control accuracy and protection potential.
Main body circuit of the present invention is constituted by AC power current rectifying and wave filtering circuit, full-bridge converter, soft switch circuit, high-frequency transformer, high frequency output rectifier and filter, pulse phase shifting control driving circuit electric connection; Its ac rectifier input terminus connects alternating current input power supplying, output terminal is communicated with ac filter circuit, the input port of ac filter circuit output terminal, soft switch circuit, pulse phase shift control driving circuit and high-frequency transformer respectively with full-bridge converter principle electric connection, the high-frequency transformer output terminal docks rectifier filter circuit output terminal output DC source with rectifier filter circuit input terminus electricity; Pulse phase shifting control driving circuit is made of reference electrode isolating amplifier circuit, phase-shift controller, switching tube driving circuit, signal comparison control circuit, liquid-crystal display and key circuit and SCM system electric connection; SCM system comprises data presentation, communication, mould/number conversion, D/A switch, warning, parameter is given and controlled function; realize mould/number, D/A switch; and anticathode protection parameter is monitored, reports to the police, is protected; its serial line interface; carry out communication with upper computer; upper computer carries out Long-distance Control and monitoring by upper computer software to potentiostat.
Full-bridge converter of the present invention is the control of pulse phase-shifting full-bridge, and the phase shifting angle size is relatively obtained by feedback signal and given signal; The soft switch circuit parameter calculates according to the main power circuit correlation parameter, and adjusts according to concrete experimental result, by waveform testing, realizes soft switch effect, effectively reduces switching loss; Liquid-crystal display and key circuit show the impressed current cathodic protection parameters on liquid crystal display, adjust parameters by button;
When the present invention worked: the industrial frequency AC civil power produced galvanic current behind current rectifying and wave filtering circuit; Galvanic current enters full-bridge converter and produces high-frequency square-wave signal; Simultaneously, by the soft switch circuit that full-bridge converter shunt capacitance, polyphone inductance constitute, the soft switching process of control full-bridge converter; The actuate signal of full-bridge converter is produced by IGBT pulse phase shifting control driving circuit; The high-frequency square-wave signal that full-bridge converter produces is transformed to suitable high frequency low voltage signal through high-frequency transformer, and this signal produces the galvanic current that needs through the high frequency output rectifier and filter.IGBT pulse phase shifting control driving circuit produces the full-bridge converter actuate signal according to following process: behind the reference electrode signal process reference electrode isolating amplifier circuit; after mould/number conversion, enter computer system; and with the cathodic protection potential of setting relatively; according to comparative result; IGBT pulse phase shifting control driving circuit produces respective drive signal; thereby adjust the average anode current size, the cathodic protection potential of setting is adjusted and is produced by liquid-crystal display and button operation circuit.
The present invention measures the native state potential of protected body automatically when start, adjustment is initially given automatically according to native state potential, adapts to dissimilar reference electrodes automatically, does not need artificial selection, has avoided the unsuitable initial given rush of current that causes; The reference electrode signal is effectively isolated amplification, suppressed the interference of common-mode signal; Simultaneously the reference electrode signal is carried out reliable filtering and amplify, improve the stability of potentiostat electric potential signal control;
Significant parameter of the present invention is as follows: given potential range is-and 2V～+ 3V is adjustable continuously; The control of Electric potentials error≤± 10mV; Current control error≤1%; Power-efficient 〉=90%; Semi-load ripple factor≤10%.
The potentiostat product that the present invention relates to is that power supply product is in impressed current cathodic protection field expanded application; on technological approaches, take into account the control of switch power technology and impressed current cathodic protection parameter; with traditional thyristor potentiostat; the technology that magneticsaturation potentiostat or analogous products are relevant is compared; the present invention adopts unique loop of power circuit topological framework and reference electrode signals collecting; isolate amplifying technique; dissimilar reference electrode adaptive techniques; adopt the integrated control chip of function height simultaneously; reduce design difficulty; improved equipment dependability; its complete machine structure principle novelty; principle is simple; small product size and weight are little; preparation cost is low, uses easy to operately, saves the energy.
Description of drawings:
Fig. 1 is a main circuit structure schematic block diagram of the present invention, comprising ac rectifier 1, ac filter circuit 2, full-bridge converter 3, high-frequency transformer 4, high frequency output rectifier and filter 5, pulse phase shift control driving circuit 6, soft switch circuit 7, A are alternating current input power supplying, B is a drive control signal, and C is a dc output end.
Fig. 2 controls the driving circuit structure schematic block diagram for pulse phase shift of the present invention, comprising reference electrode isolating amplifier circuit 8, and phase-shift controller 9, switching tube driving circuit 10, SCM system 11, liquid-crystal display and key circuit 12, signal comparison control circuit 13, D is the reference electrode signal, E is the reference electrode signal after the isolation processing, and F is a current feedback signal, and G is a voltage feedback signal, H is the switch circuit actuate signal, and I is the data remote signal.
Embodiment:
Be described further below in conjunction with accompanying drawing and by embodiment.
Embodiment:
The main body circuit of present embodiment is constituted by AC power rectification and filtering circuit 1 and 2, full-bridge converter 3, soft switch circuit 7, high-frequency transformer 4, high frequency output rectifier and filter 5, pulse phase shifting control driving circuit 6 electric connections; Its ac rectifier 1 input terminus connects alternating current input power supplying, output terminal is communicated with ac filter circuit 2, the input port of ac filter circuit 2 output terminals, soft switch circuit 7, pulse phase shift control driving circuit 6 and high-frequency transformer 4 respectively with full-bridge converter 3 principle electric connections, high-frequency transformer 4 output terminals dock high frequency output rectifier and filter 5 output terminal output DC sources with high frequency output rectifier and filter 5 input terminuss electricity; Pulse phase shifting control driving circuit 6 is made of reference electrode isolating amplifier circuit 8, phase-shift controller 9, switching tube driving circuit 10, signal comparison control circuit 13, liquid-crystal display and key circuit 12 and SCM system 11 electric connections; The input termination reference electrode signal of reference electrode isolating amplifier circuit 8, output terminal respectively with signal comparison control circuit 13 and computer system 11 information communications, signal comparison control circuit 13, liquid-crystal display and key circuit 12, phase-shift controller 9 and electric current, voltage feedback signal F and G respectively with computer system 11 information or electric connection, signal comparison control circuit 13 output terminals connect the input terminus of phase-shift controller 9, its output terminal and switching tube driving circuit 10 electric connections; SCM system 11 comprises data presentation, communication, mould/number conversion, D/A switch, warning, parameter is given and controlled function; realize mould/number, D/A switch; and anticathode protection parameter is monitored, reports to the police, is protected; its serial line interface and upper computer carry out communication, and upper computer carries out Long-distance Control and monitoring by upper computer software to potentiostat.
The signal processing of present embodiment is: outside reference electrode signal D at first is treated as the E signal through reference electrode isolating amplifier circuit 8, reference electrode isolating amplifier circuit 8 has taken into full account the characteristics of actual reference electrode signal, select suitable filter amplification circuit structure and isolation amplifier spare for use, effectively suppressed the interference of reference electrode common-mode signal; Phase-shift controller 9 is selected the controller of international popular for use, has reduced the design production cost, forms series product; SCM system 11 can be measured the native state potential of protected body automatically when start, and adjust initially given automatically according to native state potential, can adapt to dissimilar reference electrodes automatically, not need artificial selection, avoid the unsuitable initial given rush of current that causes simultaneously; Simultaneously, SCM system 11 contains remote communicating function, and upper computer can conveniently read the potentiostat parameters by supporting bitcom, and realizes the control to potentiostat.
The switch circuit actuate signal H of present embodiment drives the switch device of soft switch circuit 7, the power circuit topological framework adopts the phase-shifting full-bridge structure that extensively adopts in middle high power switching power supply field, the parameters of soft switch circuit 7 calculates according to concrete power circuit correlation parameter, and adjusts according to practical operation situation.
Behind the present embodiment potentiostat electrifying startup, the power frequency civil power through ac filter circuit 1 with exchange whole wave circuit 2 filter rectifications after, enter full-bridge converter 3, the size of the actuate signal B control phase shifting angle that pulsion phase shifter control circuit 6 produces, thereby the size of control direct current output C, simultaneously, the switching process of 7 pairs of full-bridge converters 3 of soft switch circuit is adjusted, and realizes the soft switching process of switching tube.Its specific operation process is: after energising starts, on the liquid crystal operation panel, select the constant potential state, press key up and down, regulate constant potential current potential size, equipment is regulated output automatically, and the reference electrode current potential is stabilized near the set(ting)value; Reference potential signal E outside reference electrode signal D becomes processing after reference potential isolating amplifier circuit 8 is handled after, the given signal of signal E and reference potential relatively, comparative result is given phase-shift controller 9, phase-shift controller 9 produces switch circuit actuate signal H, this H signal is through switching tube driving circuit 10 driving switch pipe switches, thus outward current.SCM system 11 is gathered reference electrode signal E, current feedback signal F, voltage feedback signal G in this process; export to definite value; and simultaneously other operation conditions such as device temperature are gathered, instant produce report to the police, guard signal, make the equipment can safe and stable operation.SCM system 11 comprises serial communication interface simultaneously, can make things convenient for communication with upper computer.
The practical operation situation of present embodiment and detailed performance test shows; the potentiostat equipment that it relates to is reliable stable; the efficient height; easy and simple to handle, the potentiostat current potential is stabilized in the more accurate scope, simultaneously the limited volume weight that reduced; reduce production costs; overall performance reaches or is higher than corresponding GB and industry standard, can be in the impressed current cathodic protection field, well substitutes traditional product.
Claims (3)
1. an intelligent full-bridge soft-switching potentiostat is characterized in that the main body circuit is constituted by AC power current rectifying and wave filtering circuit, full-bridge converter, soft switch circuit, high-frequency transformer, high frequency output rectifier and filter, pulse phase shifting control driving circuit electric connection; Its ac rectifier input terminus connects alternating current input power supplying, output terminal is communicated with ac filter circuit, the input port of ac filter circuit output terminal, soft switch circuit, pulse phase shifting control driving circuit and high-frequency transformer respectively with the full-bridge converter electric connection, the high-frequency transformer output terminal docks rectifier filter circuit output terminal output DC source with rectifier filter circuit input terminus electricity; Pulse phase shifting control driving circuit is made of reference electrode isolating amplifier circuit, phase-shift controller, switching tube driving circuit, signal comparison control circuit, liquid-crystal display and key circuit and SCM system electric connection; SCM system comprises data presentation, communication, mould/number conversion, D/A switch, warning, parameter is given and controlled function; realize mould/number, D/A switch; and anticathode protection parameter is monitored, reports to the police, is protected; its serial line interface; carry out communication with upper computer; upper computer carries out Long-distance Control and monitoring by upper computer software to potentiostat.
2. intelligent full-bridge soft-switching potentiostat according to claim 1 is characterized in that full-bridge converter is the control of pulse phase-shifting full-bridge, and the phase shifting angle size is relatively obtained by feedback signal and given signal; The soft switch circuit parameter calculates according to the main power circuit correlation parameter, and adjusts according to concrete experimental result, by waveform testing, realizes soft switch effect; Liquid-crystal display and key circuit show the impressed current cathodic protection parameter and pass through the button ordering parameter on liquid crystal display.
3. intelligent full-bridge soft-switching potentiostat according to claim 1 is characterized in that significant parameter is as follows: given potential range for-2V～+ 3V is adjustable continuously; The control of Electric potentials error≤± 10mV; Current control error≤1%; Power-efficient 〉=90%; Semi-load ripple factor≤10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101579800A CN101397674B (en) | 2008-10-19 | 2008-10-19 | Intelligent full-bridge soft-switching potentiostat |
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| CN2008101579800A CN101397674B (en) | 2008-10-19 | 2008-10-19 | Intelligent full-bridge soft-switching potentiostat |
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| CN101397674A CN101397674A (en) | 2009-04-01 |
| CN101397674B true CN101397674B (en) | 2010-09-08 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540945B (en) * | 2012-02-03 | 2014-01-01 | 上海雷磁·创益仪器仪表有限公司 | Control method of potentiostat |
| CN104087947B (en) * | 2014-07-24 | 2016-08-24 | 苏州热工研究院有限公司 | The reference electrode system with self-calibration function in cathodic protection system |
| CN105375771B (en) * | 2014-09-02 | 2017-12-15 | 康舒科技股份有限公司 | The phase-shift type full-bridge converters control circuit of DC-DC supply unit |
| CN104901543B (en) * | 2015-06-02 | 2018-01-19 | 青岛双瑞海洋环境工程股份有限公司 | Electrolysis Ballast Management system electrolysis power and its control method |
| CN111101137B (en) * | 2019-12-31 | 2021-11-12 | 南京工业大学 | Constant potential rectifier for protecting anode of concentrated sulfuric acid stainless steel acid cooler |
| CN114016037A (en) * | 2021-11-10 | 2022-02-08 | 国家石油天然气管网集团有限公司 | Cathode protection system for intelligent operation of pipeline |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2225479Y (en) * | 1994-10-24 | 1996-04-24 | 上海三思科技发展公司 | High Freqency metal anti-corrosion instrument |
| CN2725311Y (en) * | 2004-08-25 | 2005-09-14 | 大庆鑫禹昂防腐工程技术有限责任公司 | Variable frequency constant potentiometer |
| CN1786277A (en) * | 2004-12-11 | 2006-06-14 | 青岛雅合科技发展有限公司 | Method of controlling high frequency switch power source by applying digital technology on constan potential instrument |
| CN1794553A (en) * | 2005-11-28 | 2006-06-28 | 广州电器科学研究院 | Digitalization high frequency soft switch electroplating power supply |
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2008
- 2008-10-19 CN CN2008101579800A patent/CN101397674B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2225479Y (en) * | 1994-10-24 | 1996-04-24 | 上海三思科技发展公司 | High Freqency metal anti-corrosion instrument |
| CN2725311Y (en) * | 2004-08-25 | 2005-09-14 | 大庆鑫禹昂防腐工程技术有限责任公司 | Variable frequency constant potentiometer |
| CN1786277A (en) * | 2004-12-11 | 2006-06-14 | 青岛雅合科技发展有限公司 | Method of controlling high frequency switch power source by applying digital technology on constan potential instrument |
| CN1794553A (en) * | 2005-11-28 | 2006-06-28 | 广州电器科学研究院 | Digitalization high frequency soft switch electroplating power supply |
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Owner name: QINGDAO SUNRUI MARINE ENVIRONMENT ENGINEERING COMP Free format text: FORMER NAME: QINGDAO SUNRUI CORROSION AND FOULING CONTROL COMPANY |
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Address after: 266071 No. 149-1, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Sunrui Marine Environment Engineering Company Address before: 266071 No. 149-1, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: Qingdao Sunrui Corrosion and Fouling Control Company |
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Address after: 266100 No. 149-1, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Qingdao Sunrui Marine Environment Engineering Co., Ltd. Address before: 266071 No. 149-1, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: Sunrui Marine Environment Engineering Company |