CN104092386A - Inverter circuit of drive module of power supply system of buried sewage treatment equipment ventilator room - Google Patents
Inverter circuit of drive module of power supply system of buried sewage treatment equipment ventilator room Download PDFInfo
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- CN104092386A CN104092386A CN201410352994.3A CN201410352994A CN104092386A CN 104092386 A CN104092386 A CN 104092386A CN 201410352994 A CN201410352994 A CN 201410352994A CN 104092386 A CN104092386 A CN 104092386A
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Abstract
The invention discloses an inverter circuit of a drive module of a power supply system of a buried sewage treatment equipment ventilator room. The power supply system of the buried sewage treatment equipment ventilator room comprises a power supply device arranged outside a ventilator room body and a loading device arranged in the ventilator room body. The drive module is arranged between the power supply device and the loading device. A first lightning protection circuit is arranged between the input end and the ground end of the drive module. A second lightning protection circuit is arranged between the output end and the ground end of the drive module. The drive module comprises a rectifying circuit, a filtering circuit and the inverter circuit. The inverter circuit comprises a power tube drive chip. The power tube drive chip is connected to the power output end of a microprocessor circuit so as to drive corresponding power tubes to be switched on and switched off alternately according to a pulse width modulation signal output by a microprocessor of the microprocessor circuit. The performance of the power supply system can be improved at least in one certain aspect of safety or interference resistance or controllability or the like.
Description
Technical field
The present invention relates to sewage disposal technology, relate in particular to electric power system and the affiliated facility thereof of buried sewage treatment equipment Ventilator Room.
Background technology
Buried sewage treatment equipment is a kind of sewage biological treatment system of biomembrane as purification main body of take, given full play to that the biological density that the biofilm reactors such as anaerobic biofilter, catalytic oxidation bed have is large, durability against pollution is strong, power consumption is low, operate feature stable, easy to maintenance, thereby there is very wide application prospect and promotional value.
Typical buried sewage treatment equipment comprises grille well, regulating reservoir, preliminary sedimentation tank, power oxidation contact chamber, the depositing reservoir connecting successively and the Ventilator Room being connected with power oxidation contact chamber; Power oxidation contact chamber wherein comprises reactor body, reactor inner casing, rotary-cutting type blender; Reactor inner casing is arranged on reactor body inside, and its bottom opening is communicated with reactor body; Described rotary-cutting type blender runs through reactor body and the setting of reactor inner casing; The inner aeration zone that forms of reactor inner casing, the top, space between reactor inner casing outer wall and reactor body inwall forms catchment, and below forms sludge settling district; Reactor body bottom is provided with aeration tube.Wherein, filling nanoparticle suspension bio-carrier in aeration zone, microbial film on nanoparticle suspension bio-carrier and activated sludge can utilize C, N, the P growth and breeding in sewage, pollutant in water body and water eutrophication substance digestion are absorbed, the rotary-cutting type blender simultaneously arranging can effectively assist aeration tube to carry out aeration work, the most at last pollutant removal in sewage; After muddy water in sewage enters sludge settling district mud-water separation, mud can be got back to aeration zone automatically, and the water after purification is further removed suspended matter after entering depositing reservoir by catchment, enters afterwards sterilization pool, after up to standard, be discharged into receiving water body or make advanced treating.
In buried sewage treatment equipment, the blower fan in Ventilator Room is the power resources of whole sewage disposal device, must keep it to move normally.In the electric power system of Ventilator Room, as the blower fan of load equipment, connect the module of overdriving and be connected to the output as power supply unit (as civil power, solar generator, wind-driven generator), alternating current power supply unit being provided by this driver module is converted to the required alternating current of load equipment or direct current, reaches thus the control to load equipment.
The upper Shortcomings of above-mentioned Ventilator Room electric power system design: the one, Lighting Protection Measures is good not, when lightning current is too powerful, may there is fraction lightning current to enter into load equipment, cause thus load equipment to damage under thunder-strike current residual voltage is impacted, this makes security of system poor, has shortened widely its useful life; The 2nd, interference protection measure is not ideal enough, and load equipment easily suffers the interference of the factors such as power supply and external environment condition, and this stable operation on load equipment causes larger impact; The 3rd, it is convenient not to control, and the adjustment underaction that it controls parameter can not meet user's demand well.In view of this, be necessary to relate to electric power system and the subsystem thereof of new buried sewage treatment equipment, to its performance is improved.
Summary of the invention
The defect existing for prior art, the object of the present invention is to provide buried sewage treatment equipment Ventilator Room electric power system and affiliated facility thereof, so as at least can fail safe, anti-interference or can be handling etc. some aspect the performance of electric power system is improved.
For solving above technical problem, the invention provides a kind of inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module, this buried sewage treatment equipment Ventilator Room electric power system comprises and is arranged at this external power supply unit of machine room and is arranged at the intrinsic load equipment of machine room, between described power supply unit and described load equipment, driver module is set, between the input of described driver module and earth terminal, be provided with the first lightning protection circuit, between the output of described driver module and earth terminal, be provided with the second lightning protection circuit, described driver module comprises for alternating current being converted to galvanic rectification circuit, for realizing the filter circuit of galvanic filtering and energy storage effect and realizing the inverter circuit of frequency modulation and voltage modulation to alternating current conversion for completing direct current, described inverter circuit comprises power pipe driving chip, described power pipe driving chip is connected to the power take-off of microcontroller circuit, so that the pulse width modulating signal according to the microprocessor output of described microcontroller circuit, drives corresponding power tube alternate conduction and shutoff.
Compared with prior art, the present invention can improve the performance of electric power system effectively, and it at least can obtain the advantage of following some aspects:
1, fail safe improves.Be provided with secondary lightning protection, most of thunder-strike current is wherein released by the first order earth element of driver module input; And driver module output arranges second level earth element, the residual voltage that makes to enter load is less, is conducive to prevent that load is struck by lightning, and improves its safety in utilization, extends its useful life.
2, strong interference immunity.Be mainly manifested in several aspects:
(1) shielded type cable passes through earth element ground connection by one end cable shield of power supply unit, shielded type cable is by the direct ground connection of other end cable shield of load equipment, it has kept the good anti-jamming effectiveness of 2 ground connection of tradition, also limited the size of earth-current or interference simultaneously, can avoid earth-current or disturb the danger of burning shield layer of shielded cable when excessive.
(2) heart yearn of shielded type cable has all designed heart yearn screen, is conducive to the electromagnetic radiation, electrostatic coupling and the electromagnetic induction that suppress to produce between heart yearn; Also designed cable shield, be conducive to the electromagnetic interference that suppresses outside simultaneously; This two aspects factor, has eliminated the interference that electric power system shielded type cable produces preferably, is conducive to guarantee the accuracy of data.
(3) input stage of driver module is provided with filtering decoupling circuit, it is as the preposition simulation low-pass filter of AC signal input channel, have jamproof effect concurrently, can suppress to come the differential mode interference of Self Powered Device, the accuracy of proof load device data transmission.
3, can be handling better.By microcontroller circuit, control the output mode of driver module, be conducive to neatly by pre-provisioning request output voltage, thereby meet the demand of different user.For electric machinery load equipment, can, according to the setting signal of man-machine interface circuit, to motor, carry out stepless frequency conversion control.
Accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, by identical reference symbol, represent identical parts.In the accompanying drawings:
Fig. 1 is the schematic diagram of embodiment of the present invention buried sewage treatment equipment Ventilator Room;
Fig. 2 is the electric power system composition frame chart of buried sewage disposal device Ventilator Room as shown in Figure 1;
Fig. 3 is the earthing mode of shielded type cable in Fig. 2;
Fig. 4 is the structure chart of shielded type cable in Fig. 2;
Fig. 5 is the composition frame chart of driver module in Fig. 2;
Fig. 6 is the example of partial circuit in driver module shown in Fig. 5.
Embodiment
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement to be much different from alternate manner described here, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that, so the present invention is not subject to the restriction of following public specific embodiment.
Referring to Fig. 1, it is the schematic diagram of buried sewage treatment equipment Ventilator Room.This buried sewage treatment equipment Ventilator Room comprises machine room body 101: machine room body 101 is spliced by chromatic steel sandwich plate, simple in structure, and easy disassembly, production cost are low; Stress frame is made by shaped steel, and structural strength is high; On machine room body 101, establish shutter, ventilate, heat dispersion is good; Roofing sloping face, prevents that rainwater from flowing in machine room.
As shown in Figure 1, interior sewage power distribution cabinet 102 and the blower fan system of arranging of machine room body 101, this blower fan system connects steam line (being generally rigid polyvinyl chloride material makes) 106; Blower fan system setting can alternate run two above blower fans 103 for aeration, the driver module of this blower fan system is connected to solar generator 104, wind-driven generator 105 and civil power, can according to circumstances by different supply terminals equipment, be powered, help avoid power breakdown.
Above-mentioned buried sewage treatment equipment Ventilator Room is provided with good lightning protection and interference protection measure, and handling very good, is described as follows.
Referring to Fig. 2, represent the preferred embodiment of electric power system of the present invention.This electric power system comprises load equipment (as power distribution cabinet 102, blower fan 103 etc.) 3, between it and power supply unit (comprise solar generator 104, wind-driven generator 105,, civil power and power switching device etc.) 1, be provided with driver module 2, wherein between power supply unit 1 and driver module 2, all by stube cable, be connected between driver module 2 and load equipment 3.
In the present embodiment, power supply unit 1 is AC power supply device, as common civil power 220V or 380V; Driver module 2 is AD-CD (AC-DC) driver module, also can be AC-AC driver module; Stube cable is shielded type cable 4, and it is connected to lightning protection circuit, to lightning current is introduced to the earth, improves thus the fail safe of system.Especially, in the present embodiment.In order to make lightning current secure flows mistake, between each circuit element, all by shielded type cable 4, connect, its terminals are screwed.
The lightning protection circuit of the present embodiment comprises secondary lightning protection circuit, specifically two-stage earth element 5, preferably: first order earth element 5 is closed spark gap, be connected between the input and earth terminal of driver module 2, the lightning current of can releasing can reach 20KA; Second level earth element 5 discharge tubes, are connected between the output and earth terminal of driver module 2, and the fraction thunder-strike current of the driver module 2 of flowing through is further discharged, and to entering the residual voltage of load equipment 3, remake current limliting one time, make it lower than specified safe range.This just can make most of thunder-strike current release by the first order earth element 5 of driver module 2 inputs, the residual voltage that the second level earth element 5 of driver module 2 output settings can make to enter load is less, thereby be conducive to prevent that load is struck by lightning, improve its safety in utilization, extend its useful life.
Above-mentioned first order earth element 5, second level earth element 5 all can select the earth resistance of Zinc-oxide piezoresistor or other type to replace, and have equally good lightning protection effect.When lightning current is larger, Zinc-oxide piezoresistor is breakdown, and lightning current flows into earth terminal through Zinc-oxide piezoresistor rapidly, and the residual voltage that enters load equipment 3 is clamped in preset range.
Owing to being provided with secondary lightning protection, come most of thunder-strike current of Self Powered Device 1 circuit transmission line to release by first order earth element 5, and that second level earth element 5 make to enter the residual voltage of load equipment 3 is less.This is conducive to prevent that load is struck by lightning, and improves safety in utilization, extends its useful life.
As mentioned above, between power supply unit 1 and driver module 2, be all connected by shielded type cable 4 between driver module 2 and load equipment 3, the screen of shielded type cable 4 wherein is all connected to ground, below further illustrates.
Referring to Fig. 3, represent the earthing mode of shielded type cable 4.Load equipment 3 is connected with power supply unit 1 by shielded type cable 4, this shielded type cable 4 consists of cable core and cable shield, this cable shield wraps cable core to reduce electromagnetic interference, wherein: shielded type cable 4 passes through earth element 5 ground connection near one end cable shield of power supply unit 1, and shielded type cable 4 is near the direct ground connection of other end cable shield of load equipment.
In practical power systems, the length of shielded type cable 4 is generally greater than 20m, therefore can make earth element 5 be connected to apart from the position of power supply unit 4m～6m.This earth element 5 can be earth resistance, and particular type can be (certainly also can be other element) such as Zinc-oxide piezoresistors.The resistance of this earth resistance equates with the equivalent resistance of the cable shield of shielded type cable 4, also can choose separately according to actual conditions.
Shielded type cable 4 between this embodiment load equipment 3 and power supply unit 1 has adopted 2 grounding schemes, thereby has still kept the good anti-jamming effectiveness of 2 grounding schemes of tradition; Due to shielded type cable 4 near one end cable shield of power supply unit 1 by earth element ground connection, be conducive to earth current or disturb current limliting, avoid thus earth-current or disturbed the danger of burning screen when excessive, also can reach electromagnetic compatibility effect preferably, and can not cause negative antenna effect simultaneously.
Referring to Fig. 4, represent the concrete structure of shielded type cable.In the external protection 41 of this shielded type cable 4, be provided with many heart yearns 45, wherein every heart yearn is enclosed with inner protective layer 43; Especially, in external protection, 41 layers are provided with cable shield 42, and the inner side of inner protective layer 43 is provided with heart yearn screen 44.
Because heart yearn and the cable self of shielded type cable 4 all arranges screen, can suppress interference and extraneous interference between heart yearn, particularly: the heart yearn of shielded type cable has all designed heart yearn screen, be conducive to the electromagnetic radiation, electrostatic coupling and the electromagnetic induction that suppress to produce between heart yearn; Self arranges cable shield cable, is conducive to the electromagnetic interference that suppresses outside; This two aspects factor, has eliminated the interference that electric power system shielded type cable produces preferably, is conducive to guarantee the accuracy of data.
Preferably, the two ends of cable shield 42 and heart yearn screen 44 are ground connection respectively, to effectively reduce interference source.More preferably, be make cable shield 42 and heart yearn screen 44 near one end of power supply unit 1 by earth element 5 ground connection, cable shield 42 and or heart yearn screen 44 near the direct ground connection in one end of load equipment 3.
The electric power system of the embodiment of the present invention has filtering decoupling formula anti-interference function, below describes.
Referring to Fig. 5, it is the preferred embodiment of driver module.This electric power system comprises load equipment 3, and it is connected to the output of power supply unit 1 by driver module 2, in order to the alternating current that power supply unit 1 is provided, is converted to the required alternating current of load equipment 3 or direct current; Especially, the input stage of this driver module 2 is provided with filtering decoupling circuit 20, it is preferably RC filtering decoupling circuit, by the current-limiting resistance R being connected in series and filter capacitor C, formed, make thus the output plus terminal of power supply unit and current-limiting resistance R and the filter capacitor C that output ground termination enters serial connection, can suppress to come the differential mode interference of Self Powered Device 1, the accuracy of proof load equipment 3 transfer of data.
Filtering decoupling circuit 20 in the present embodiment is RC filtering decoupling circuit, and it,, as the preposition simulation low-pass filter of AC signal input channel, has jamproof effect concurrently; Between two terminals of alternating current-direct current signal input channel, access decoupling capacitance, can be high frequency differential mode interference signal bypass is provided.Be in passing with pointing out, from anti-interference angle, consider, RC filter is better than LC filter: RC filter is dissipation type filter, noise energy can be become to thermal energy consumption and dissipate; LC filter can produce additional magnetic interference, thereby inductance will add radome.
Driver module 2 in above-described embodiment can be optimized, the driver module 2 of this example comprises the parts such as rectification circuit 21, power factor (PF) Circuit tuning 22, filter circuit 23, inverter circuit 24 and microcontroller circuit 25, man-machine interface circuit 26 successively, wherein: rectification circuit 21 forms (being preferably full bridge rectifier) by rectifier diode or bridge heap, comprise necessary interference filtering circuit, its major function is that alternating current is converted to direct current; Circuit of power factor correction 22 is selectable unit (SU), power semiconductor and control chip, consist of, it is also connected to the Active PFC end of microcontroller circuit 25, and effect is to make input current approach sine wave, reduce mains by harmonics content, realize the object that improves power factor; Filter circuit 23 (being preferably RC filter circuit) is mainly comprised of elements such as electrochemical capacitors, completes galvanic filtering and energy storage effect; Inverter circuit 24 is comprised of power model and drive circuit, and power model can be Intelligent Power Module, and it is also connected to the driving signal end of described microcontroller circuit, and its major function is, completes direct current to the conversion of three-phase alternating current, realizes frequency modulation and voltage modulation object; Microcontroller circuit 25 is comprised of microprocessor (DSP) and peripheral circuit; the order that it is sent according to man-machine interface circuit 26; send corresponding command signal; power ratio control factor correcting circuit 22 and inverter circuit 24 work; and according to circuit feedback information, carry out necessary circuit protection and troubleshooting.Like this, this embodiment controls the output mode of driver module by microcontroller circuit, is conducive to neatly by pre-provisioning request output voltage, thereby meets the demand of different user.
Referring to Fig. 6, be the embodiment of part circuit structure in driver module.Specifically for the inverter circuit of motor 31 and the example of microcontroller circuit of blower fan, its working method is: civil power becomes direct current through rectification circuit 21, after electrochemical capacitor filtering, the two ends of the DC power supply 241 of access inverter circuit 24, access filter capacitor between the two ends of this DC power supply 241.And the microprocessor of microcontroller circuit 25 (MCU/DSP) 251 is according to the setting signal of man-machine interface circuit 26, the motor 31 of load equipment 3 is controlled.
In the present embodiment, inverter circuit 24 comprises power pipe driving chip 242, this power pipe driving chip 242 is connected to the microprocessor (MCU/DSP) 251 of microcontroller circuit 25, so that the pulse width modulating signal according to microprocessor 251 outputs, drives corresponding power tube alternate conduction and shutoff.Concrete, described inverter circuit 24 comprises six power tube S1～S6, and these six power tubes are divided into three groups, and every group power is controlled a phase winding of three phase electric machine 31.
The concrete connected mode of each power tube is: the source electrode of power tube S1, S2, S3 connects one end of DC power supply 241 jointly, the drain electrode of power tube S4, S5, S6 connects the other end of DC power supply 241 jointly, the tie point of the source electrode of the drain electrode of power tube S1 and power tube S4 connects the U phase terminal of motor, the tie point of the source electrode of the drain electrode of power tube S2 and power tube S5 connects the V phase terminal of motor, and the source electrode tie point of the drain electrode of power tube S3 and power tube S6 connects the W phase terminal of motor; Power tube, the grid of power tube S1, S2, S3, S4, S5, S6 connects respectively an output of power pipe driving chip 242, and each input of this power pipe driving chip 242 is controlled by output pulse width conditioning signal PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 Zhong mono-tunnel of microprocessor 251 respectively.
During start, microprocessor 251 produces corresponding 6 road pulse width modulating signals according to the motor speed of setting, and drives signal PWM1～PWM6; By power pipe driving chip 242, drive 6 power tubes (MOSFET or IGBT) S1～S6; The alternate conduction of these power tubes and shutoff, produce three-phase modulations waveform, and output voltage is adjustable, the three-phase alternating current of changeable frequency, outputs to U, V, the W terminals of motor 31, thereby realizes the stepless frequency control of motor 31.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the inverter circuit of a buried sewage treatment equipment Ventilator Room electric power system driver module, this buried sewage treatment equipment Ventilator Room electric power system comprises and is arranged at this external power supply unit of machine room and is arranged at the intrinsic load equipment of machine room, between described power supply unit and described load equipment, driver module is set, between the input of described driver module and earth terminal, be provided with the first lightning protection circuit, between the output of described driver module and earth terminal, be provided with the second lightning protection circuit, described driver module comprises for alternating current being converted to galvanic rectification circuit, for realizing the filter circuit of galvanic filtering and energy storage effect and realizing the inverter circuit of frequency modulation and voltage modulation to alternating current conversion for completing direct current, it is characterized in that, described inverter circuit comprises power pipe driving chip, described power pipe driving chip is connected to the power take-off of microcontroller circuit, so that according to the pulse width modulating signal of the microprocessor output of described microcontroller circuit, drive corresponding power tube alternate conduction and shutoff.
2. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 1, it is characterized in that, described inverter circuit comprises six power tubes, and described six power tubes are divided into three groups, and wherein every group power is controlled a phase winding of three phase electric machine.
3. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 2, is characterized in that, described six power tubes are MOSFET power tube or IGBT power tube.
4. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 1, it is characterized in that, described driver module comprises power factor (PF) Circuit tuning man-machine interface circuit, described power factor (PF) Circuit tuning is arranged between described rectification circuit and described filter circuit, described power factor (PF) Circuit tuning is connected to the Active PFC end of described microcontroller circuit, and described man-machine interface circuit is connected to the input of described microcontroller circuit.
5. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 1, is characterized in that, the input stage of described driver module is provided for suppressing the filtering decoupling circuit from the differential mode interference of described power supply unit.
6. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 5, it is characterized in that, described filtering decoupling circuit is RC filtering decoupling circuit, and described RC filtering decoupling circuit forms by being serially connected with the output plus terminal of described power supply unit and exporting current-limiting resistance and the filter capacitor held.
7. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 1; it is characterized in that; described the first lightning protection circuit comprises closed spark gap or earth resistance, and described the second lightning protection circuit comprises discharge tube or earth resistance.
8. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 1; it is characterized in that; between described power supply unit and described driver module, be all connected by shielded type cable between described driver module and described load equipment; many heart yearns are set in the external protection of described shielded type cable cable, and described heart yearn is enclosed with inner protective layer.
9. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 8; it is characterized in that; the inner side of the external protection of described shielded type cable is provided with cable shield, and the inner side of the inner protective layer of described shielded type cable is provided with heart yearn screen.
10. the inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module as claimed in claim 9, it is characterized in that, described shielded type cable passes through earth element ground connection near cable shield described in one end of described power supply unit and described heart yearn screen, and described shielded type cable is near cable shield described in the other end of described load equipment and the direct ground connection of described heart yearn screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410352994.3A CN104092386A (en) | 2014-07-22 | 2014-07-22 | Inverter circuit of drive module of power supply system of buried sewage treatment equipment ventilator room |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410352994.3A CN104092386A (en) | 2014-07-22 | 2014-07-22 | Inverter circuit of drive module of power supply system of buried sewage treatment equipment ventilator room |
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| CN104092386A true CN104092386A (en) | 2014-10-08 |
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| CN201410352994.3A Pending CN104092386A (en) | 2014-07-22 | 2014-07-22 | Inverter circuit of drive module of power supply system of buried sewage treatment equipment ventilator room |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852460A (en) * | 2015-05-20 | 2015-08-19 | 徐伯琴 | Inversion circuit of sewage processing equipment power system |
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| CN202633928U (en) * | 2012-04-06 | 2012-12-26 | 四川省送变电建设有限责任公司 | Lightning protection power secondary system |
| CN202772882U (en) * | 2012-04-06 | 2013-03-06 | 四川省送变电建设有限责任公司 | Shielding-type anti-interference electric power secondary system |
| CN202872648U (en) * | 2012-04-06 | 2013-04-10 | 四川省送变电建设有限责任公司 | Filter decoupling anti-interference electric power secondary system |
| CN203984254U (en) * | 2014-07-22 | 2014-12-03 | 诸暨市沃思环保技术有限公司 | The inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module |
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- 2014-07-22 CN CN201410352994.3A patent/CN104092386A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202633928U (en) * | 2012-04-06 | 2012-12-26 | 四川省送变电建设有限责任公司 | Lightning protection power secondary system |
| CN202772882U (en) * | 2012-04-06 | 2013-03-06 | 四川省送变电建设有限责任公司 | Shielding-type anti-interference electric power secondary system |
| CN202872648U (en) * | 2012-04-06 | 2013-04-10 | 四川省送变电建设有限责任公司 | Filter decoupling anti-interference electric power secondary system |
| CN203984254U (en) * | 2014-07-22 | 2014-12-03 | 诸暨市沃思环保技术有限公司 | The inverter circuit of buried sewage treatment equipment Ventilator Room electric power system driver module |
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| CN104852460A (en) * | 2015-05-20 | 2015-08-19 | 徐伯琴 | Inversion circuit of sewage processing equipment power system |
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Application publication date: 20141008 |