CN204287859U - Based on embedded ARM processor oil pipeline cathodic protection protection power source device - Google Patents
Based on embedded ARM processor oil pipeline cathodic protection protection power source device Download PDFInfo
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- CN204287859U CN204287859U CN201420792632.1U CN201420792632U CN204287859U CN 204287859 U CN204287859 U CN 204287859U CN 201420792632 U CN201420792632 U CN 201420792632U CN 204287859 U CN204287859 U CN 204287859U
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Abstract
The utility model relates to a kind of based on embedded ARM processor oil pipeline cathodic protection protection power source device, comprises cabinet, Energy control main circuit, device control module, device detection module; Described Energy control main circuit comprise connect successively air switch, A.C. contactor, do not control three phase full bridge rectifier bridge, filtering high-frequency rectifier device, semibridge system DC/DC inverter; Described device control module comprises arm processor, photoelectrical coupler, driver for isolating, keyboard, display, wireless communication module; Described arm processor produces pwm control signal, described arm processor by serial communication interface and upper machine communication; The collection signal of described photoelectrical coupler input end input after amplification, shaping, its output terminal is connected with arm processor; Described wireless communication module adopts cdma mobile communication network; Described device detection module comprises reference potential testing circuit, output voltage detecting circuit, inspection testing circuit, current detecting and protection circuit.Beneficial effect: the corrosion condition of Timeliness coverage oil pipeline, realizes inspection detection and the remote monitoring of oil pipeline.
Description
Technical field
The utility model relates to a kind of cathodic protection protection power source device, particularly relates to a kind of based on embedded ARM processor oil pipeline cathodic protection protection power source device.
Background technology
In today of modernization of industry development, the demand of people to oil and products thereof is increasing, and the inconsistency of habitat of oil and position, the consumer center, the oil pipeline adopting long distance is usually needed to transport, from remote mining area to the city of prosperity, oil pipeline is crossed over mountain after mountain, wear river span paddy is laid in and changes very in complex environment, and the leaching that suffer from corrosive medium is attacked.Corrosion causes the leakage of device damage, oil, casualties, stop work and production, contaminated environment, and these consequences all can cause huge direct and indirect economic loss.Perforation more than 780 times between a certain oil field in November, 1988 operation in February, 1993 of Zhongyuan Oil Field, Oil spills reaches more than 10,000 tons, is forced to stop well more than 50 time, affects output more than 4000 ton.Visible corrosion loss huge.
The corrosion control of current oil pipeline generally takes overlayer to add the associating measure of cathodic protection; this point obtains the approval of occurrences in human life in the industry substantially; constant pressure source is wherein utilized to carry out impressed current cathodic protection method, along with the development of Power Electronic Technique and switch power technology obtains increasing attention.Therefore development oil pipeline cathodic protection protection power source device that is efficient, stable, that adapt to rugged surroundings is significant for petroleum delivery pipeline anticorrosion.Mainly there are following 3 principal characters in currently used anti-corrosion protection supply unit: one is work alone, and infield disperses, and many in the wild, the management of instrument blindly, delayed, difficult in maintenance; Two is effects that the operation conditions of instrument directly affects anti-corrosion protection, has influence on safety in production and environmental protection; Three is that domestic Cathode protect testing technology is also relatively backward, and substantially or manual measurement current potential, in remote control, remote measurement, domestic enterprise is also probing boldly long distance pipeline, but limit because of route and level, does not all have anything to improve.Therefore, utilize the teletransmission communication of data to carry out remote real-time monitoring to anti-corrosive apparatus, to production, management, scientific research is significant.
Utility model content
In order to solve the problems of the technologies described above, the utility model discloses based on embedded ARM processor oil pipeline cathodic protection protection power source device.
The technical solution adopted in the utility model is: based on embedded ARM processor oil pipeline cathodic protection protection power source device, comprise cabinet, Energy control main circuit, device control module, device detection module; It is characterized by: described Energy control main circuit comprise connect successively air switch, A.C. contactor, do not control three phase full bridge rectifier bridge, filtering high-frequency rectifier device, semibridge system DC/DC inverter; Described semibridge system DC/DC inverter comprises high-frequency isolation transformer, and the two ends of described high-frequency isolation transformer primary side are connected to the mid point of electric capacity C1, the mid point of electric capacity C2 and switching tube VT1, switching tube VT2; Described high-frequency isolation transformer secondary side obtains unipolarity square-wave pulse through high frequency full-wave rectification, then obtains output waveform by LC filtering link; Described device control module comprises arm processor, photoelectrical coupler, driver for isolating, keyboard, display, wireless communication module; Described arm processor produces pwm control signal, described arm processor by serial communication interface and upper machine communication; The collection signal of described photoelectrical coupler input end input after amplification, shaping, its output terminal is connected with arm processor; Described wireless communication module adopts cdma mobile communication network and upper machine communication; Described device detection module comprises reference potential testing circuit, output voltage detecting circuit, inspection testing circuit, current detecting and protection circuit.
Be preferably: described reference potential testing circuit comprises its input stage operational amplifier A 1 and constitutes differential amplifier; The internal resistance of two input signal sources of described differential amplifier is respectively R1, R2 and R3 and is in series; Operational amplifier A 2, photoisolator HCNR200, operational amplifier A 3 form electrical isolation, amplifying circuit.
Be preferably: described output voltage detecting circuit comprises and adopts resistance to carry out the input end of input operational amplifier after dividing potential drop to tested voltage, and the output terminal of described operational amplifier is connected with photoelectrical coupler HCNR200; Described photoelectrical coupler HCNR200 output terminal will be connected with arm processor after operational amplifier.
Be preferably: described inspection testing circuit comprises 2 NOT gate chip; Wherein first not gate input end is connected with collection signal, resistance, electric capacity, and its output terminal is connected with second not gate input end by diode.
Be preferably: described current detecting and protection circuit adopt Hall current sensor; The current signal that described Hall current sensor collects is converted into voltage signal through resistance, and a road is sent to arm processor and is carried out A/D conversion after low-pass filtering, to carry out current monitoring; One tunnel is sent to comparer LM393 and is carried out over current fault judgement.
Be preferably: described ARM is preferably model LP2131.
The present invention has following beneficial effect and progress significantly:
1), utilize ARM to produce pwm control signal, realize the control to semibridge system DC/DC transducer.
2), realize the closed-loop control of negative voltage feedback, the voltage follow set-point of output can be made and keep stable when load and electrical network change.There is output feedack and reference feeds back two kinds of feedback systems, can select as required.
3), to the duty of system and operation conditions monitor, Guarantee control system can process in time when the faults such as overload, overcurrent occur.
4), utilize RS-485 interface that data are uploaded to master system by cdma network transport module, and realize the function of remote monitoring and change control parameter.
5), the corrosion condition of Timeliness coverage oil pipeline, realize inspection detection and the remote monitoring of oil pipeline.
Accompanying drawing explanation
Accompanying drawing illustrates embodiment of the present utility model, it should be noted that, accompanying drawing only for illustrating principle of the present utility model, do not limit its scope, and accompanying drawing is not necessarily drawn in proportion.
Fig. 1 is that the utility model supply unit is applied to cathodic protection protection schematic diagram.
Fig. 2 is the utility model relay―contact control schematic diagram.
Fig. 3 is that the utility model is based on ARM digital processor controls schematic diagram.
Fig. 4 is the utility model semibridge system DC transfer circuit schematic diagram.
Fig. 5 is the utility model reference potential Cleaning Principle figure.
Fig. 6 is the utility model output voltage detecting circuit schematic diagram.
Fig. 7 is the utility model inspection testing circuit schematic diagram.
Fig. 8 is the utility model current detection circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing 1-8, structural principle of the present utility model and principle of work are described in further details.
Cathodic protection protection power source device is the device alternating voltage of input being become required DC voltage.In order to make switch power supply equipment normally work, making each ingredient of power supply can play its maximum usefulness, each ingredient of power supply just must be made mutually to coordinate, mutually cooperate.Three parts can be divided into from large aspect power supply: cabinet, Energy control main circuit and device control module, device detection module three parts by functions.(1), cabinet plays effect that is fixing and shielding; (2), Energy control main circuit is voltage and the power transfer of responsible power supply, can be DC voltage or electric current the convert alternating current of input by control circuit, and disconnection AC power when carrying out the opening, stop and protect of relay―contact control completion system; (3), device controls, detection module is brain and the nerve of whole power-supply system, controls the work of whole device and realize various detection and corresponding defencive function by it.Control circuit is wanted to produce stable PWM gating pulse, and testing circuit is wanted accurately to measure reference potential and output voltage, and can carry out fault detect and protection.
Shown in accompanying drawing 1.This device collects oil pipeline data-signal by data acquisition unit, feeds back in the arm processor of supply unit inside, through arm processor data analysis, process, realizes the quick diagnosis to Corrosion of Oil Pipeline situation.
Shown in accompanying drawing 2.Cathodic protection protection power source system start, shut down and emergency protection time, all need by relay contactor to have controlled.During startup, first close air switch KQ, by power transformer be control, detect, drive circuit board provides power supply, its alternating current 220V exports as Relay-controlled Circuit provides power supply.After starting, rectifying part will first work, and to capacitor charging, then DC/DC transducer is started working.Wherein: KM1 represents coil or the contact of A.C. contactor, contact OC_R is the normally closed contact of the little relay of protecting control on check-out console.Starting control flow is: press start button, first main contactor KM1 coil is energized work.On the one hand, KM1 main contacts closes, three-phase alternating current by the current-limiting resistance in main circuit to capacitor charging; On the other hand, KM1 assists normally opened contact adhesive form self-locking and inform arm processor, and after time delay a period of time, arm processor sends the high-frequency pulse signal of short circuit SCR, and short circuit current limitation resistance enters normal operating conditions; After sending short circuit SCR signal, ARM starts to produce pwm signal and delivers to driver element, and whole system starts to enter duty.Shutdown control flow is: after pressing stop button, and KM1 is dead electricity first, and contact disconnects and informs ARM, and ARM stops generating pwm signal, then system reset after respective handling, and each several part returns to original state.When overcurrent and overload fault protection, KM1 ac contactor contact OC_R disconnects and makes KM1 dead electricity, and ARM adopts stop exporting PWM ripple after signal, and shows corresponding failure message, but now system does not reset, unless just hand-reset can return to normal.
Shown in accompanying drawing 3.ARM control module is the core of whole control system, is responsible for processing in real time the ruuning situation of system.The embedded ARM processor of Acom computing machine company limited production selected by the microprocessor of control system, and its model is preferably: LP2132.This microprocessor mainly realizes function:
1, system completes the reading of parameter before starting, and can carry out keyboard more new settings; To the various diagnosing malfunction of system during startup, judge whether to meet system operation conditions.
2, under diagnosing normal situation, startup optimization.
3, start-up study is after primary side capacitor charging completes, and first sends high-frequency pulse signal to SCR short circuit charging current limiter resistance, produces pwm control signal more afterwards by the waveform generator of ARM.
4, according to working condition and place, given reference potential, given output voltage and station code are set respectively.
5, the output voltage values provided according to testing circuit and reference potential value, change the dutycycle of PWM gauge tap signal in real time, realize closed-loop control.
6, by serial communication interface and upper machine communication, to host computer transmitting system operational factor, receive and perform the steering order that host computer sends, the remote monitoring and the inspection that realize system detect.
7, the operation conditions of surveillance, timely protection system when breaking down.
8, hardware, software double " house dog " function, improves the reliability of system.
Introduce circuit diagram and the principle of work of each building block in device below further.
(1), electric power main circuit adopts power supply semibridge system DC/DC conversion module.
Three phase supply is generally adopted for industrial and mining enterprises such as oil delivery; therefore input side adopts three-phase bridge rectifier; its rectifier output voltage is 2.4U2=2.4 × 220=528V (in formula, U2 refers to phase voltage); and the DC voltage being finally supplied to cathodic protection system is generally tens volts; the amplitude of its step-down is comparatively large, therefore uses decompression transducer.Due to peak power output 10kW and for safety and jamproof consideration, select power supply semibridge system DC/DC conversion module.
In power supply semibridge system DC/DC conversion module, the Main Function of power transformer has two, one is the electrical isolation realized between input and output, two is raise or reduce the alternating voltage amplitude after pulse modulated and carry out power delivery, and energy is transferred to load instantaneously.
Shown in Figure 4.Its principle of work is as follows: in half-bridge circuit, and the mid-point voltage of electric capacity C1, C2 is Ui/2.VT1 and VT2 alternate conduction, making the primary side of power transformer form amplitude is the square wave alternating voltage of Ui/2, power transformer secondary obtains the alternating voltage of same waveform by a certain no-load voltage ratio, obtaining ud through high frequency full-wave rectification is unipolarity square-wave pulse, then obtains approximate straight uo waveform by LC filtering link.Change the dutycycle of switch, also just change output average voltage.Due to electric capacity C1, C2 every straight effect, half-bridge circuit, to switching tube ON time is asymmetric and DC component that the is power transformer primary side voltage caused has self-poise effect due to two, is therefore less likely to occur magnetic bias and the DC magntic saturation of transformer.In order to avoid upper and lower two switching tubes occur in the process of the change of current of short duration while conducting phenomenon, and cause Damage by Short Circuit switching device, each switching tube dutycycle D separately more than 50%, and can not should leave allowance.
In addition, due in semibridge system DC converter, the electric current Symmetrical alternation in high-frequency transformer, the operating magnetic field flux of iron core magnetization curve the 1st, also alternation symmetrically between 3 quadrants, therefore special magnetic-reset circuit need not be set.
(2), reference potential testing circuit:
Reference potential measurement is the Main Means in cathodic protection system monitoring, according to the measurement result of protection potential, can determine the guard mode of pipeline.In order to reduce influencing each other between contrast electrode and metering circuit, native system have employed the isolation that Phototube Coupling method realizes signal.According to the requirement to system accuracy, the linearity and stability, the present invention selects the high linearity analog photoelectricity coupled apparatus HCNR200 of Agilent company.
See Fig. 5.Input stage adopts CA3140 operational amplifier to constitute differential amplifier.In figure, the internal resistance of two input signal sources of differential amplifier is respectively R1, R2 and R3 and is in series, its internal resistance changes the operation relation of differential amplifier, therefore, differential amplifier is generally used for the insignificant voltage source of internal resistance, and uses as the amplifier of difference voltage.And the reference potential one end detected is from contrast electrode herein; the other end is from protected oil pipeline (i.e. the negative terminal of cathodic protection protection power source); its internal resistance is relatively little; measured reference potential is less difference mode signal; needing higher common-mode rejection ratio when carrying out signal condition, adopting this circuit to carry out amplification conditioning.
Operational amplifier A 1 and coupled device constitute differential amplifier circuit, and constitute electrical isolation circuit by operational amplifier A 2, HCNR200, A3 and surrounding components and parts thereof.Wherein LED and the PD1 part of A1, A2 and HCNR200 adopts+15V Power supply, the PD2 part of A3 and HCNR200 then uses+12V Power supply, and+12V and+15V power supply are the output windings of being isolated by power transformer two-way, obtain respectively by respective regulator rectifier circuit, there is electrical isolation characteristic, thus ensure the isolation between input and output.
(3), output voltage detecting circuit
Cathodic protection protection power source output voltage is an important parameter, contributes to understanding anticorrosion state all sidedly to the monitoring of output voltage.In some specific areas, corrosion environment and application scenario, need to carry out output voltage feedback, maintain the constant of output voltage.Therefore, need to carry out output voltage examination and controlling, and the alternative of reference feedback and output voltage feedback is set.
Shown in Figure 6.Because output voltage is relative to very high control circuit, require that itself and control circuit carry out electrical isolation, therefore adopt the isolation detection circuit formed based on precision photoelectric coupler HCNR200.The Cleaning Principle of this and reference potential testing circuit is similar, and difference is that front end does not adopt differential amplifier circuit to carry out signal condition, and just the simple resistance that adopts carries out dividing potential drop to tested voltage.This is that amplitude is higher because output voltage generally changes within the scope of 20 ~ 90V, and cathodic protection power-supply system to have passed through bulky capacitor filtering output voltage at DC output end more stable, except needs carry out dividing potential drop, do not need too much conditioning.
(4), inspection testing circuit
For pipe laying, in some Special zone and remote unmanned area, often need monitoring patrolman whether normally to carry out walkaround inspection on time, carry out scientific and effective management to facilitate.Add inspection soft-touch control for this reason, after patrolman arrives inspection place, available finger touches soft-touch control, after testing circuit detects this touch signal, be converted into level signal and be sent to arm processor, the temporal information having personnel to carry out patrolling and site information are just sent to host computer by wireless communication module by ARM.
Shown in Figure 7.In figure, A is the metal electrode film be arranged on outside cabinet, when not having personnel to touch metal electrode film, resistance R1 makes not gate 1 input end be low level, its output terminal is high level, diode VD reverse bias, electric capacity C2 is charged to supply voltage VCC, and not gate 2 is exported as low level is to the I/O mouth of ARM.When staff touches electrode slice A, the induced signal of 50Hz is transferred to the input end of not gate 1, and its output terminal drops to electronegative potential from noble potential, makes VD positively biased, and electric capacity C2 is discharged by VD, and not gate 2 input end becomes low level output end and becomes high level.Wherein, electric capacity C1 is used for eliminating the frequency interferences of more than 50Hz.Obviously, touch metal electrode film A not gate 2 with hand and just export a positive pulse.The sensitivity of this circuit inductance 50Hz undesired signal is quite high, and the positive pulse rising edge of output is very steep, and pulsewidth is Millisecond, and whole circuit is low in energy consumption.(5), current detecting and current foldback circuit
Shown in accompanying drawing 8.The current signal that Hall current sensor collects is converted into voltage signal through resistance R1, and a road is sent to arm processor and is carried out A/D conversion after low-pass filtering, to carry out current monitoring; One tunnel is sent to comparer LM393 and is carried out over current fault judgement.When the voltage signal collected is greater than the overcurrent threshold voltage preset, namely there is overcurrent (OC) phenomenon, comparer LM393 output pin uprises, triode saturation conduction, relay K 1 coil electricity, and its normally closed contact 3B-3C is connected in the wire loop into the main contactor KM1 of main circuit power supply, at this moment normally closed contact disconnects, contactor KM1 power-off, makes the separated of major loop and electrical network.Meanwhile, arm processor detects over-current signal, sends fault handling instruction protection system in time.Diode D2 in figure, when there is over current fault, maintains LM393 and exports high level, makes K1 coil maintain energising, and its normally closed contact maintains and disconnects, even if now press start button, main contactor KM1 also can not adhesive.Until fix a breakdown, press reset button S1 or arm processor makes it reset by I/O mouth, can make LM393 output low level again, and then make K1 power-off, its normally closed contact recovers closed, and system can start again.
(6), remote data communication:
Oil pipeline cathodic protection power supply is the special power supply carrying out anti-corrosion protection for pipe laying; often be arranged on remote unmanned area with pipe laying; therefore utilize wireless communication technique anticathode anti-corrosion protection power-supply device to carry out remote monitoring and pipeline inspection detection, grasp pipeline corrosion protection protection situation in time, accurately, all sidedly.
Wireless communication module carries the main task of monitoring terminal and upper machine communication as physical medium, adopts the advantage that current cdma mobile communication network has conventional wireless network not compare.Wireless monitor system have employed wireless DTU based on CDMA as communications platform.DTU refers to data terminal equipment, can provide transparent wireless transfer channel for communication data, and the data being passed the subscriber equipment of coming by RS-485 are passed to data center by mobile communications network, and the heart reverts to raw data more in the data.
System work process:
After pressing start button, main contactor KM1 closes, and access three-phase alternating current, three-phase commutation bridge is started working and charged to DC bus capacitor.After DSP detects enabling signal, be in no hurry to export pwm pulse signal, but DC bus capacitor charging is complete to want first time delay a period of time to treat, then short circuit current limitation resistance, and read preserve in data memory last user setting parameters (if carried out functional parameter adjustment, parameter call according to after adjustment), then make waveform generator in arm processor start output pwm signal to driving circuit.The dutycycle of the pwm signal exported, from minimum value 1%, is carried out adjustment by pi regulator and is gradually changed, until reach set-point by the output voltage of A/D sampling acquisition, or the reference potential detected reaches set-point.When system cloud gray model, arm processor constantly judges the various fault-signals (overcurrent etc.) and cyclic in-position measuring signal that detect fender collection and processes.If there is no phenomenon of the failure, the output voltage values that detects or reference potential value (concrete which valve system of display can according to pre-set feedback system automatic discrimination) will be shown.Then can shut down if any fault, block pwm signal, display failure cause.As patrol officer's cyclic in-position measuring, touch Data-logging switch, cyclic in-position measuring information and site information then can be sent to host computer by wireless communication module by arm processor.
Above embedded ARM processor oil pipeline cathodic protection protection power source device provided by the utility model is described in detail, apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for those skilled in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (5)
1., based on an embedded ARM processor oil pipeline cathodic protection protection power source device, comprise cabinet, Energy control main circuit, device control module, device detection module; It is characterized by: described Energy control main circuit comprise connect successively air switch, A.C. contactor, do not control three phase full bridge rectifier bridge, filtering high-frequency rectifier device, semibridge system DC/DC inverter; Described semibridge system DC/DC inverter comprises high-frequency isolation transformer, and the two ends of described high-frequency isolation transformer primary side are connected to the mid point of electric capacity C1, the mid point of electric capacity C2 and switching tube VT1, switching tube VT2; Described high-frequency isolation transformer secondary side obtains unipolarity square-wave pulse through high frequency full-wave rectification, then obtains output waveform by LC filtering link; Described device control module comprises arm processor, photoelectrical coupler, driver for isolating, keyboard, display, wireless communication module; Described arm processor produces pwm control signal, described arm processor by serial communication interface and upper machine communication; The collection signal of described photoelectrical coupler input end input after amplification, shaping, its output terminal is connected with arm processor; Described wireless communication module adopts cdma mobile communication network and upper machine communication; Described device detection module comprises reference potential testing circuit, output voltage detecting circuit, inspection testing circuit, current detecting and protection circuit; Described reference potential testing circuit comprises its input stage operational amplifier A 1 and constitutes differential amplifier; The internal resistance of two input signal sources of described differential amplifier is respectively resistance R1, resistance R2 and resistance R3 and is in series; Operational amplifier A 2, photoisolator HCNR200, operational amplifier A 3 form electrical isolation, amplifying circuit.
2. according to claim 1 based on embedded ARM processor oil pipeline cathodic protection protection power source device, it is characterized by: described arm processor model is LP2131.
3. according to claim 1 based on embedded ARM processor oil pipeline cathodic protection protection power source device, it is characterized by: described output voltage detecting circuit comprises and adopts resistance to carry out the input end of input operational amplifier after dividing potential drop to tested voltage, and the output terminal of described operational amplifier is connected with photoelectrical coupler HCNR200; Described photoelectrical coupler HCNR200 output terminal will be connected with arm processor after operational amplifier.
4. according to claim 1 based on embedded ARM processor oil pipeline cathodic protection protection power source device, it is characterized by: described inspection testing circuit comprises 2 NOT gate chip; Wherein first not gate input end is connected with collection signal, resistance R4, electric capacity, and its output terminal is connected with second not gate input end by diode.
5. according to claim 1 based on embedded ARM processor oil pipeline cathodic protection protection power source device, it is characterized by: described current detecting and protection circuit adopt Hall current sensor; The current signal that described Hall current sensor collects is converted into voltage signal through resistance, and a road is sent to arm processor and is carried out A/D conversion after low-pass filtering, and to carry out current monitoring, a road is sent to comparer LM393 and is carried out over current fault judgement.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141117A (en) * | 2015-10-16 | 2015-12-09 | 珠海格力电器股份有限公司 | Switch power supply control circuit and method |
| CN110442016A (en) * | 2019-08-15 | 2019-11-12 | 四川轻化工大学 | A kind of intelligent Anticorrosive Power device and its control method based on fuzzy neural network |
| CN114325079A (en) * | 2021-12-31 | 2022-04-12 | 国家管网集团北方管道有限责任公司沈阳检测技术分公司 | Intelligent potential acquisition device for solid-state decoupling device and acquisition system thereof |
| CN116262972A (en) * | 2021-12-13 | 2023-06-16 | 中国石油天然气股份有限公司 | Casing cathode protection equipment based on impressed current |
-
2014
- 2014-12-09 CN CN201420792632.1U patent/CN204287859U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141117A (en) * | 2015-10-16 | 2015-12-09 | 珠海格力电器股份有限公司 | Switch power supply control circuit and method |
| CN110442016A (en) * | 2019-08-15 | 2019-11-12 | 四川轻化工大学 | A kind of intelligent Anticorrosive Power device and its control method based on fuzzy neural network |
| CN116262972A (en) * | 2021-12-13 | 2023-06-16 | 中国石油天然气股份有限公司 | Casing cathode protection equipment based on impressed current |
| CN114325079A (en) * | 2021-12-31 | 2022-04-12 | 国家管网集团北方管道有限责任公司沈阳检测技术分公司 | Intelligent potential acquisition device for solid-state decoupling device and acquisition system thereof |
| CN114325079B (en) * | 2021-12-31 | 2024-03-15 | 国家管网集团北方管道有限责任公司沈阳检测技术分公司 | Intelligent potential acquisition device for solid-state decoupler and acquisition system thereof |
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