CN1786277A - Method of controlling high frequency switch power source by applying digital technology on constan potential instrument - Google Patents
Method of controlling high frequency switch power source by applying digital technology on constan potential instrument Download PDFInfo
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- CN1786277A CN1786277A CN 200410075502 CN200410075502A CN1786277A CN 1786277 A CN1786277 A CN 1786277A CN 200410075502 CN200410075502 CN 200410075502 CN 200410075502 A CN200410075502 A CN 200410075502A CN 1786277 A CN1786277 A CN 1786277A
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Abstract
The invention relates to a method for digital control high frequency switching power supply technique in constant potential apparatus. It belongs to cathode protection technique field. The invention is made up of ac power supply rectification filter circuit, inverter circuit, high frequency rectification filter circuit, synthesis operation display control circuit, feedback signal isolation A/D conversion circuit, isolation predrive circuit, power semiconductor drive circuit, power semiconductor overflow protection circuit, and high speed digital control pulse modulation unit. The constant potential apparatus has the effects of large power, high efficiency, small volume, light weight, and so on. The invention can improve control accuracy and efficiency, reduce volume-weight and heating, improve complete machine reliability of the constant potential apparatus.
Description
Technical field
The present invention relates to a kind ofly, belong to the impressed current cathodic protection technical field in the method that is applied to the control of Applied Digital on the potentiostat of impressed current cathodic protection system high frequency switch power technology.
Background technology
Usually the potentiostat that is applied to play in the engineerings such as oil, petrochemical industry, electric power, harbour, boats and ships, ocean platform and municipal administration the galvanic protection effect generally is silicon controlled rectifier perseverance and magneticsaturation potentiostat.Find in use that such existing potentiostat efficient is low, volume is big, weight is big, industrial frequency noise arranged during work, during the little electric current of pilot circuit poor reliability, output, electric current in the load makes the potentiostat of this type can not satisfy the actual needs that engineering is used in the use gradually hardly continuously and problem such as poor electrical performance.
The domestic report that application simulation control switching technology on potentiostat is also arranged at present, but still rest on the test level, and employing is analog control mode.Such potentiostat main power circuit is made of AC power current rectifying and wave filtering circuit, inverter circuit, rectifier filter circuit, power semiconductor driving circuit, its pilot circuit is an analog control mode, be about to simulating signal through after the simple transformation, directly deliver to pulsed modulation control special chip with analog system, by analyzing the simulating signal of feedback, output pulsed modulation control signal is controlled the work of inverter circuit by this chip.Reduce though in use find this type of potentiostat volume and weight, poor reliability, control accuracy is low, can not satisfy actual field needs.
Summary of the invention
Purpose of the present invention with regard to be to avoid and overcome the shortcoming and defect of prior art and provide a kind of on potentiostat the method for Applied Digital control high frequency switch power technology.
Potentiostat is a kind of rectifier with special purpose, and the present invention compares with the magneticsaturation technology with silicon controlled rectifier, in the inverter circuit of main power circuit part and control section bigger gap is arranged.Compare with domestic correlation technique report, the present invention has adopted unique high-speed figure pulsed modulation control unit and feedback signal isolation mode/number conversion circuit to replace analog pulse modulation control unit and feedback signal analog conversion circuit.
The present invention uses the digital control technology control switching, promptly with high power semi-conductor as the inverter circuit core devices, be the pilot circuit core component with high-speed figure setting pulse modulating unit.Adopt the potentiostat of the method for the invention have that power is big, efficient is high, volume is little, in light weight, reliable and stable, noise is little, effect such as easy to operate; The present invention can improve control accuracy, the efficient of instrument, reduce volume weight and heating, improve the reliability of complete machine, can also well improve control accuracy and response speed, thereby potentiostat is greatly improved in reliability, control accuracy and aspect such as easy and simple to handle.
The present invention adopts following technical measures to realize its goal of the invention.
A kind of on potentiostat the method for Applied Digital control high frequency switch power technology; it is by the AC power current rectifying and wave filtering circuit is arranged; inverter circuit; rectifier filter circuit; the synthetic operation display control circuit (shows; operation; blower fan control; temperature control; data storage; real-time clock; RS-232; the RS-485 communication; report to the police); feedback signal (reference potential; output voltage; outward current) isolation mode/number conversion circuit; isolate predrive circuit; the power semiconductor driving circuit; the power semiconductor current foldback circuit constitutes; it is characterized in that it also has high-speed figure setting pulse modulation control method; digital control pulse modulation method can be width modulation (PWM), also can be pulse-frequency modulation (PFM).It is by presetting potential and reference potential are compared by the digital pulse modulation control method; determine the pulse width that inverter circuit is opened; after isolating the predrive circuit amplification; the driving power semiconductor drive circuit is controlled inverter circuit; make its outward current satisfy the needs of galvanic protection; this electric current makes protected body polarization to protection potential through supporting electrode and dielectric medium.Power semiconductor is meant the power semiconductor as the high frequency conversion switch, as insulated gate bipolar field-effect transistor (IGBT), field-effect transistor (MOSFET) etc.
Digital control pulsed modulation control method of the present invention is by suitable hardware and software by high-speed figure setting pulse modulating unit; according to filtering algorithm; feedback signal is carried out digital filtering to be handled; again composite feedback signal with by synthetic operation display control circuit ready-formed working parameter; calculate pulse modulated result according to control algolithm, comprehensive again overcurrent protection signal production burst modulator control signal.Pulse control signal is after isolating the predrive circuit amplification, and the driving power semiconductor drive circuit is controlled inverter circuit, makes its outward current satisfy the needs of galvanic protection, realizes the control to potentiostat output.Of particular note, the high frequency switch power operating frequency be it is generally acknowledged greater than 20kHz, guarantee it is controlled and satisfies the requirement of control accuracy, must level and smooth as far as possible control open the width of pulse, for example the fruit switching frequency adopts 25KHZ, be 40us golden wave period, half wave cycles is 20us, the control accuracy of pulse width is the prerequisite that guarantees the outward current control accuracy, guarantee millesimal pulse width control accuracy as need, then minimum pulse control width should be 20ns, need select high-speed dsp for use, FPGA, CPLD etc. are as the hardware of high-speed figure setting pulse modulating unit, if device can not get guaranteeing, for example adopt 80C51, low speed devices such as 89C52, then need earlier calculation result to be carried out D/A switch, simulating signal after the conversion is finished pulsed modulation work through the device of pulsed modulation special use again, be that pulsed modulation still needs analog system to realize, this is to need very high speed because of the generation for HF switch pulse calculating and waveform, and the arithmetic speed of low speed micro-chip can not satisfy the control requirement of HF switch; Secondly, consider the fluctuation of load and the requirement of control accuracy, must carry out the sampling of feedback signal (reference potential, output voltage, outward current) by continuous high speed, and sampled signal must guarantee enough precision, have only control accuracy and sample rate to be guaranteed, the control result could stablize and be accurate.
Description of drawings
Fig. 1 is a kind of potentiostat circuit structured flowchart of using the inventive method.
Fig. 2 is a high-speed figure setting pulse modulating unit structured flowchart.
As shown in Figure 1,1 be the AC power current rectifying and wave filtering circuit wherein; 2 is feedback signal isolation mode/number conversion circuit; 3 is high-speed figure setting pulse modulating unit; 4 for isolating predrive circuit; 5 is the power semiconductor driving circuit; 6 is inverter circuit; 7 are constituted by the power semiconductor current foldback circuit; 8 is rectifier filter circuit; 9 is the synthetic operation display control circuit; P is an AC power; O is the zero-bit input; E is the reference potential input; V is an output voltage signal; A is an output current signal; D is direct current output.
As shown in Figure 2; wherein 10 is DSP; model is TMS320VC5402 PGE100; operating frequency 100MHz, 11 is CPLD, model is ATF1508SQC100; 12 is program store SST39VF040; 13 is RAM, and model is IS61LV12816, and 14 is house dog DS1832; 15 is the 20M crystal oscillator; 16 is the 100M crystal oscillator, and I is through the voltage feedback signal after the A/D conversion for the current feedback signal after changing through A/D, B; C is the reference potential feedback signal after changing through A/D; S is an IGBT overcurrent protection signal, and Z is for being provided with parameter, and F is the PWM waveform.
Embodiment
Below in conjunction with content shown in the accompanying drawing the present invention and application thereof are further elaborated.
Use potentiostat circuit of the present invention by AC power current rectifying and wave filtering circuit 1; inverter circuit 6; rectifier filter circuit 8; synthetic operation display control circuit 9; feedback signal isolation mode/number conversion circuit 2; isolate predrive circuit 4; power semiconductor driving circuit 5; power semiconductor current foldback circuit 7 constitutes; by the digital pulse modulation control method by reference potential E and presetting potential are compared; determine the pulse width that inverter circuit is opened; after isolating predrive circuit 4 amplifications; driving power semiconductor drive circuit 5 is controlled inverter circuit 6, makes its output satisfy the electric current of protection negative electrode needs.Described digital pulse modulation control method is according to filtering algorithm by high-speed figure setting pulse modulating unit 3; feedback signal is carried out digital filtering to be handled; again composite feedback signal with by synthetic operation display control circuit 9 ready-formed working parameters; calculate pulse modulated result according to control algolithm; comprehensive again overcurrent protection signal production burst modulator control signal; pulse control signal is after isolating predrive circuit 4 amplifications; driving power semiconductor drive circuit 5 is controlled inverter circuit 6, makes its output satisfy the electric current of protection negative electrode needs.Should use in the example, the specific implementation measure of high-speed figure setting pulse modulating unit 3 is to have adopted the digital PWM pilot circuit, and the signal that the digital PWM pilot circuit is accepted has with the lower section: reference potential signal E, outward current voltage signal V are by numerary signal that the feedback signal isolation mode/number conversion circuit 2 converts to; Prefabricated potential parameters by 9 settings of synthetic operation display control circuit; By power semiconductor driving circuit 5 feedback current overload signals (high level is represented overcurrent), power semiconductor driving circuit 5 is realized by the IGBT current foldback circuit.When carrying out pulsewidth calculating, reference potential signal E, outward current voltage signal V at first carries out digital filtering to be handled, then compare according to prefabricated potential parameters and reference potential E, according to comparative result, the pulse width that calculating should be exported and the variable quantity of pulse width, judge again whether output voltage and electric current transfinite, if transfinite, then pulse width can only reduce and can not increase, and judges at last whether the electric current of power semiconductor IGBT transships, if nonoverload, then pulse width is calculated and is finished, its calculation result directly is sent to isolates predrive circuit 4, if overload is then closed pulse output.Pulse modulated hardware is to be core with the high-speed figure process chip, and the special-purpose sequence of control of establishment, that present embodiment is selected for use is DSP, model is TMS320VC5402 PGE100, operating frequency 100MHz, the program store of DSP is SST39VF040, and RAM is IS61LV12816, and uses the house dog of DS1832 as DSP.Isolate predrive circuit 4 after receiving pulse width calculation result, pwm control signal is isolated amplification, drive the switch of the IGBT driving circuit control inverter circuit power semiconductor IGBT of back level.After alternating-current process AC power current rectifying and wave filtering circuit 1 rectification of civil power input; form direct current and be input to inversion module; inversion module is under the control of driving circuit; the direct current of input is converted to the alternating-current of high frequency; after rectifier filter circuit 8 was handled, output galvanic current D used for protected body again.
That present embodiment is selected for use as shown in Figure 2 is DSP, model is TMS320VC5402 PGE100, operating frequency 100MHz, the program store of DSP is SST39VF040, RAM is IS61LV12816, and use the house dog of DS1832 as DSP, and the 20M crystal oscillator is as frequency reference, and DSP adopts 5 overtones bands to move during work.Total line traffic control adopts extensive gate array CPLD, and model is ATF1508SQC100, and CPLD also is responsible for the generation of PWM waveform and the sequential control of high-speed AD sampling in addition, and the 100M crystal oscillator provides frequency reference to CPLD.
The feedback signal of the electric current I of High-Speed High-Accuracy AD collection, voltage B, reference potential C is delivered CPLD, delivers DSP by CPLD and carries out delivering PWM waveform computation program module behind the digital filtering.
Monopulse guard signal S delivers CPLD, and is delivered the PWM waveform computation program module of DSP by CPLD.
Parameter Z is set delivers DSP, comprise other operating parameters such as operational mode, prefabricated parameter by the synthetic operation display control circuit.
The generation of PWM drive waveforms: PWM waveform computation program module synthesis be provided with feedback signal such as parameter and electric current, voltage, reference potential, monopulse protection and restriction electric current, deboost, etc. the width and the frequency of calculation of parameter pwm signal; deliver CPLD, form the PWM actuate signal by CPLD in conjunction with the monopulse guard signal again.
The calculating of pwm signal pulse width, the method for calculation under the different operational modes are basic identical.DSP calculates the difference of prefabricated value and actual value, and mathematical formula calculations incorporated FUZZY ALGORITHMS FOR CONTROL such as use high order curve are calculated required pwm signal width, in conjunction with parameter or the required pwm signals of signal generation such as threshold currents, ration the power supply pressure, monopulses.
Adopt the potentiostat of the method for the invention have that power is big, efficient is high, volume is little, in light weight, reliable and stable, noise is little, effect such as easy to operate; The present invention can improve control accuracy, the efficient of instrument, reduce volume weight and heating, improve the reliability of complete machine, can also well improve control accuracy and response speed, thereby potentiostat is greatly improved in reliability, control accuracy and aspect such as easy and simple to handle.
Claims (2)
1; a kind of method of the Applied Digital control high frequency switch power technology on potentiostat; it is by the AC power current rectifying and wave filtering circuit; inverter circuit; rectifier filter circuit; the synthetic operation display control circuit; feedback signal isolation mode/number conversion circuit; isolate predrive circuit; the power semiconductor driving circuit; the power semiconductor current foldback circuit constitutes; it is characterized in that it is by reference potential and presetting potential are compared by the digital pulse modulation control method; determine the pulse that inverter circuit is opened; after isolating the predrive circuit amplification; the driving power semiconductor drive circuit is controlled inverter circuit, makes its output satisfy the electric current of protection negative electrode needs.
2; according to claim 1 a kind of on potentiostat the method for Applied Digital control high frequency switch power technology; it is characterized in that described digital pulse modulation control method is according to filtering algorithm by high-speed figure setting pulse modulating unit; feedback signal is carried out digital filtering to be handled; again composite feedback signal with by synthetic operation display control circuit ready-formed working parameter; calculate pulse modulated result according to control algolithm; comprehensive again overcurrent protection signal production burst modulator control signal; pulse control signal is after isolating the predrive circuit amplification; the driving power semiconductor drive circuit is controlled inverter circuit, makes its output satisfy the electric current of protection negative electrode needs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410075502 CN1786277A (en) | 2004-12-11 | 2004-12-11 | Method of controlling high frequency switch power source by applying digital technology on constan potential instrument |
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| CN 200410075502 CN1786277A (en) | 2004-12-11 | 2004-12-11 | Method of controlling high frequency switch power source by applying digital technology on constan potential instrument |
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| CN1786277A true CN1786277A (en) | 2006-06-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397674B (en) * | 2008-10-19 | 2010-09-08 | 青岛双瑞防腐防污工程有限公司 | Intelligent full-bridge soft-switching potentiostat |
| CN102281012A (en) * | 2011-08-03 | 2011-12-14 | 苏州热工研究院有限公司 | Double-closed-loop fuzzy controlled intelligent power module (IPM) type intelligent potentiostat with phase-shift full-bridge soft switch |
| CN103147082A (en) * | 2013-03-25 | 2013-06-12 | 青岛雅合阴保工程技术有限公司 | Cathode protection device for controlling multiplexed output by utilizing polarization potential and operating method thereof |
| CN113957445A (en) * | 2021-10-12 | 2022-01-21 | 天津哈德韦尔智慧物联科技有限公司 | Bidirectional output quick response potentiostat |
| RU2818849C1 (en) * | 2023-04-06 | 2024-05-06 | Общество с ограниченной ответственностью Научно-производственная компания "ПромТехМастер" | Polyphase voltage converter for cathodic protection station |
-
2004
- 2004-12-11 CN CN 200410075502 patent/CN1786277A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397674B (en) * | 2008-10-19 | 2010-09-08 | 青岛双瑞防腐防污工程有限公司 | Intelligent full-bridge soft-switching potentiostat |
| CN102281012A (en) * | 2011-08-03 | 2011-12-14 | 苏州热工研究院有限公司 | Double-closed-loop fuzzy controlled intelligent power module (IPM) type intelligent potentiostat with phase-shift full-bridge soft switch |
| CN103147082A (en) * | 2013-03-25 | 2013-06-12 | 青岛雅合阴保工程技术有限公司 | Cathode protection device for controlling multiplexed output by utilizing polarization potential and operating method thereof |
| CN113957445A (en) * | 2021-10-12 | 2022-01-21 | 天津哈德韦尔智慧物联科技有限公司 | Bidirectional output quick response potentiostat |
| RU2818849C1 (en) * | 2023-04-06 | 2024-05-06 | Общество с ограниченной ответственностью Научно-производственная компания "ПромТехМастер" | Polyphase voltage converter for cathodic protection station |
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Open date: 20060614 |