CN202634316U - Energy taking device based on capacitive voltage divider - Google Patents
Energy taking device based on capacitive voltage divider Download PDFInfo
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- CN202634316U CN202634316U CN2012202596025U CN201220259602U CN202634316U CN 202634316 U CN202634316 U CN 202634316U CN 2012202596025 U CN2012202596025 U CN 2012202596025U CN 201220259602 U CN201220259602 U CN 201220259602U CN 202634316 U CN202634316 U CN 202634316U
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Abstract
The utility model provides an energy taking device based on a capacitive voltage divider. The device comprises the capacitive voltage divider, a transformer rectifier unit and a power supply conversion unit, wherein the input end of the transformer rectifier unit is connected with the output end of the capacitive voltage divider, the output end of the transformer rectifier unit is connected with the input end of the power supply conversion unit, the capacitive voltage divider outputs alternating current electricity subjected to the voltage division to the transformer rectifier unit to be converted into direct current electricity, and then, the electricity is output after being subjected to the voltage stabilizing and filtering treatment through the power supply conversion unit. Compared with the prior art, the energy taking device has the advantages that the structure is simple, the realization is easy, the cost is lower, the reliability is high, the maintenance is little, the application range is wide, and the like. In addition, many insulation matching problems do not need to be considered, and the energy taking can be realized only through regulating the energy taking capacitance and the voltage division capacitance.
Description
Technical field
The utility model belongs to electric field and gets the ability field, is specifically related to a kind of energy taking device based on capacitor voltage divider.
Background technology
In the prior art, adopt following three kinds of schemes to get ability usually:
1. bus current is got ability
Utilize bus current get can operation principle as shown in Figure 1.N among the figure
2The secondary side winding number of turn for current transformer on the high voltage bus; R
SBe the coil internal resistance; B is a rectifier bridge; U
0Be the voltage behind the rectifying and wave-filtering; R
LBe balanced load resistance.This energy of can circuit obtaining of getting comes from the high voltage bus electric current, is to accomplish through the magnetic induction coil T in the current transformer that is through on the high voltage bus.Owing to around magnetic field, in this magnetic field, obtain energy through magnetic induction coil T so around the bus, handle then, be high-tension line (being high voltage bus) power supply.
Though this get can scheme energy taking device have that volume is little, compact conformation, insulation-encapsulated is simple, safe in utilization, cost is low, reliability is relatively than advantages such as height; But because the high voltage bus electric current is not a stationary value; And excursion is very big; Two kinds of maximum conditions when therefore requiring magnetic induction coil to take into account to flow through minimum, maximum current in the high voltage bus, and subsequent process circuit should have defencive function, stable to guarantee power supply.Seeing that still there is the dead band of minimum value in prior art, so when bus current was too small, this energy taking device is cisco unity malfunction just.
2. capacitance current is got ability
Utilize capacitance current get can operation principle as shown in Figure 2.U is a high voltage bus voltage among the figure, and C is a capacitor voltage divider, and I is flow through capacitor voltage divider and the electric current of getting the former limit of ability transformer T, N
1And N
2Be that get can the transformer primary side and the umber of turn of secondary side, this kind energy taking device be utilize capacitor voltage divider around the high voltage bus around electric field get can, it is similar that the bus current in this supply power mode and the mode 1 is got ability.
Because the relative electric current of primary side voltage is more stable; Therefore the output of the power supply of this scheme is also more stable; But in design, be faced with bigger difficulty: at first; Be how to guarantee to get the electrical isolation between ability circuit and the follow-up work circuit, this requirement has strict overvoltage protection and EMC Design; Secondly, be that this method has more source of error, multiple factors such as temperature, stray capacitance all will influence the performance of this method; Once more, be that the power that adopts this method to obtain is limited, though can adjust power output through the size that changes capacitor voltage divider C, excessive electric capacity will bring more problem.
3. light is got ability
Light get can basic principle as shown in Figure 3, it mainly adopts laser or other light source through optical fiber light energy to be sent to the high-pressure side from low-pressure side, converts light energy into electric flux by electrooptical device (photocell) again, and stable power-supplying is provided after treatment.
This is a kind of brand-new power supply plan, and its outstanding advantage is that energy passes through Optical Fiber Transmission to the high-pressure side with the form of light from low-pressure side, realizes the electrical isolation between high and low pressure fully, does not receive the influence of electromagnetic interference, and is reliable and stable.But still there is following difficult point in design: the 1. emission wavelength of laser and power output temperature influence all, something must be done to controls temperature automatically.2. the influence of the restriction of Stimulated Light power output, particularly photoelectric conversion efficiency, the finite energy that it provides, manufacturing cost is high.
In sum, the design of three kinds of power supply plans is complicated more than, cost is higher.Therefore, need those skilled in the art to develop a novel energy taking device that can solve problems such as fail safe, reliability and cost.
The utility model content
In order to overcome the above-mentioned defective of prior art, the purpose of the utility model is to propose a kind of simple in structure, cost is lower, reliability is high energy taking device based on capacitor voltage divider, and this energy taking device is realized through following technical scheme:
A kind of energy taking device based on capacitor voltage divider; It comprises capacitor voltage divider, transformation rectification unit and power conversion unit, and the input of said transformation rectification unit links to each other with the output of capacitor voltage divider, its output links to each other with the input of power conversion unit; The alternating current that said capacitor voltage divider will pass through dividing potential drop exports the transformation rectification unit to, is converted into direct current, carries out exporting after voltage stabilizing, the Filtering Processing through power conversion unit again.
Further; Said capacitor voltage divider comprises each electric capacity that is series between high voltage bus and the earth: one of them electric capacity can electric capacity for getting, all the other electric capacity are dividing potential drop electric capacity; From alternating current that high voltage bus obtained after dividing potential drop electric capacity carries out dividing potential drop, from get can electric capacity the two ends output AC.
Further, the concrete syndeton of each electric capacity is:
One end of first electric capacity in said each electric capacity links to each other with high voltage bus, an end ground connection of last electric capacity, series connection each other between each electric capacity.
Further, said get can electric capacity and dividing potential drop electric capacity all can adopt cylindric planar high voltage capacitor, promptly form by two circular parallel plate electrodes and the dielectric that is filled between two-plate.
Further, said get can electric capacity and dividing potential drop electric capacity can be installed in the post insulator that has full skirt.
Further, can be provided with the piezo-resistance that is used to eliminate resonance between the input of the output of said capacitor voltage divider and transformation rectification unit.
Further, said transformation rectification unit can comprise power frequency reducing transformer and rectifier bridge, and the primary side of said power frequency reducing transformer links to each other with the output of capacitor voltage divider, its secondary side links to each other with the input of rectifier bridge.
Further, said transformation rectification unit can also comprise dc capacitor and the voltage-stabiliser tube that is connected with the output of rectifier bridge.
Further, said power conversion unit can comprise direct-flow voltage regulation unit and capacitor, and said direct-flow voltage regulation unit converts the direct current of transformation rectification unit output into be suitable for power consumption equipment direct current, and exports power consumption equipment to through behind the capacitor filtering.
Further, said direct-flow voltage regulation unit can comprise DC-DC module or the low pressure differential voltage stabilizing chip with wide voltage input, and the variation that is used to eliminate because of load impedance causes getting the ability influence that voltage fluctuation brought.
Compared with prior art, the beneficial effect of the utility model is:
This energy taking device not only has simple in structure, is easy to realize that cost is lower; Reliability is high, safeguards lessly, and advantage such as have wide range of applications; And need not to consider too much insulation coordination problem, just can realize getting ability as long as get ability electric capacity and dividing potential drop electric capacity through adjustment.
Description of drawings
Fig. 1 utilizes bus current to get the fundamental diagram of ability in the prior art;
Fig. 2 utilizes capacitance current to get the fundamental diagram of ability in the prior art;
Fig. 3 utilizes light to get the basic principle figure of ability in the prior art;
Fig. 4 is the structure principle chart of the utility model energy taking device embodiment;
Fig. 5 is the fundamental diagram of capacitor voltage divider embodiment in the utility model;
Fig. 6 is the fundamental diagram of transformation rectification unit in the utility model;
Fig. 7 is the fundamental diagram of power conversion unit in the utility model.
Embodiment
Below in conjunction with accompanying drawing the energy taking device of the utility model is done further detailed description.
The said energy taking device based on capacitor voltage divider of this example makes to get not receive environmental limitations, as long as promptly under any enclosed environment or open-air atmosphere, stable high voltage is arranged, and just can the stable energy of sustainable supply.Its operation principle is: since no matter in the high voltage bus electric current how to change; Its voltage all be stablize constant; So after setting up a plurality of series capacitances between high voltage bus and the earth, the high voltage electric field between high voltage bus and the earth will make the enough energy of the interior generation of wherein a certain electric capacity supply power.
Fig. 4 shows the theory diagram based on the energy taking device of capacitor voltage divider.As shown in Figure 4, this routine energy taking device comprises capacitor voltage divider, transformation rectification unit and power conversion unit three parts.
Wherein, getting can capacitor C
1With the dividing potential drop capacitor C
2~ C
NClose and be called capacitor voltage divider, as the input of whole electric field energy taking device, be responsible for obtaining energy from high voltage bus through the mode of series connection dividing potential drop, the energy that back level power consumption equipment uses all can capacitor C from getting
1Obtain; The transformation rectification unit is responsible for can capacitor C getting
1The alternating current of obtaining is converted into the direct current of required voltage grade, and direct current relatively stably is provided after the filtering, is convenient to back level power consumption equipment and uses; Power conversion unit is responsible for converting the direct current relatively stably that the transformation rectification unit was handled the direct current that is suitable for the requirement of power consumption equipment electric pressure into and outputing to power consumption equipment.This capacitor voltage divider energy taking device can guarantee that the supply voltage that obtains is steady and lasting.Three part-structures and operation principle in the face of this energy taking device is elaborated down.
1. capacitor voltage divider
Capacitor voltage divider comprises each electric capacity that is series between high voltage bus and the earth: one of them electric capacity can electric capacity for getting, all the other electric capacity are dividing potential drop electric capacity; From alternating current that high voltage bus obtained after dividing potential drop electric capacity carries out dividing potential drop, from get can electric capacity the two ends output AC.In this example, can capacitor C with first electric capacity as getting
1, all the other electric capacity are as the dividing potential drop capacitor C
2~ C
N
Fig. 5 shows the operation principle sketch map of capacitor voltage divider.As shown in Figure 5, getting can capacitor C
1With the dividing potential drop capacitor C
2~ C
NBe connected between high voltage bus and the earth, getting can capacitor C
1An end link to each other the dividing potential drop capacitor C with high voltage bus
NAn end link to each other with the earth, getting can capacitor C
1With the dividing potential drop capacitor C
NThe other end between be in series with remaining dividing potential drop capacitor C
2~ C
N-1Busbar voltage is being got the ability capacitor C after dividing potential drop
1Two ends produce the required voltage of transformation rectification unit, promptly can capacitor C from getting
1Two ends have been drawn and have been got and can export by power supply, and link to each other with the input of transformation rectification unit.Getting can capacitor C
1, the dividing potential drop capacitor C
2~ C
NBe cylindric planar high voltage capacitor, promptly form that dielectric should be selected withstand voltage height, office lowers, dielectric constant is moderate material for use by two circular parallel plate electrodes and the dielectric that is filled between two-plate.Getting can capacitor C
1With the dividing potential drop capacitor C
2~ C
NBe installed in the post insulator with full skirt design, post insulator can be processed by epoxy resin, silicon rubber or pottery.
Because electric capacity has capacitive reactance through alternating current the time, according to the capacitance partial pressure principle, getting can capacitor C
1On can get certain voltage U
C1, this voltage can pass through formula
Try to achieve U in the formula
LPhase voltage for high-tension line; Z
C1Can capacitor C for getting
1Capacitive reactance; Z
C2Be the dividing potential drop capacitor C
2Capacitive reactance; Z
CNBe the dividing potential drop capacitor C
NCapacitive reactance.
Foregoing description can power supply output be in unloaded state to getting.If getting and can power supply output place connect load, load will be participated in dividing potential drop so, can influence and get ability electric power output voltage Uac.Different loads or same load different working state all can cause the variation of load impedance, thereby cause voltage U ac fluctuation.The compensating unit of generally being made up of passive components such as resistance, electric capacity, inductance through adding suppresses the fluctuation of Uac; But if add the compensating unit of confirming inner parameter in advance; This energy taking device must design to certain loads so, thereby makes its range of application dwindle; If add automatic or reaction type compensating unit, then because the complexity of this compensating unit itself makes energy taking device complicated more undoubtedly, cost is higher, even may cause reliability to reduce.And because the capacitor voltage divider in this example is to get the ability capacitor C through serial connection between high voltage bus and the earth
1With the dividing potential drop capacitor C
2~ C
N, and will get the ability capacitor C
1On ac energy convert to behind the dc energy again for a back level power consumption equipment provides power supply, so only need suitably adjustment get the ability capacitor C
1With the dividing potential drop capacitor C
2~ C
NThe appearance value, and the DC voltage-stabilizing link that in follow-up unit, adds energy storage filtering link and wide range input voltage gets final product.
2. transformation rectification unit
Fig. 6 shows the operation principle of transformation rectification unit.As shown in Figure 6, the effect of transformation rectification unit is can capacitor C with getting in the capacitor voltage divider
1The alternating current of output is converted into the direct current of required voltage grade, and direct current relatively stably is provided after the filtering, is convenient to back level power consumption equipment and uses.It mainly is made up of power frequency reducing transformer T1 and rectifier bridge D1, but is not limited to this.
Because power frequency reducing transformer T1 and load thereof are mainly emotional resistance, are connected and get output place of ability power supply.Therefore harmonic frequency in the electrical network possibly cause resonance between capacitor voltage divider and Industrial Frequency Transformer primary side like this, between the primary side of getting output and Industrial Frequency Transformer that can electric capacity, is parallel with a piezo-resistance RV1 as shown in Figure 6.When normal operation, resistance R V1 leakage current is minimum, is high-impedance state; When unusual overvoltage appearred in the Industrial Frequency Transformer first side winding, the overvoltage of generation was moved with the short circuit of Industrial Frequency Transformer first side winding resistance R V1 rapidly, thereby made the device outage be protected.After resonance phenomena disappeared, resistance R V1 reverted to high-impedance state, device can be automatically normal operation input again.
Also can be connected with dc capacitor C1 as shown in Figure 6 and voltage-stabiliser tube VD1 at the output of rectifier bridge D1, dc capacitor C1 should select big capacity, thereby strengthens its energy storage filter capacity, and the variation that alleviates because of load impedance causes voltage U
AcThe influence that fluctuation is brought.
3. power conversion unit
The operation principle of power conversion unit is as shown in Figure 7.U among Fig. 7
DcIt is the input of power conversion unit.U
DcThrough converting the direct current of the electric pressure that electricity supply and use equipment uses behind the DC voltage-stabilizing to, pass through capacitor C again
2After the filtering, export power consumption equipment to and power supply is provided for it.
The circuit that DC voltage-stabilizing among Fig. 7 part can be core by the DC-DC module or the low pressure differential voltage stabilizing chip of wide voltage input is formed, and this structure has advantages such as output voltage stabilization, good reliability, cost are lower.
Energy taking device in this example is in the busbar voltage amplitude is 380V to 1000kV scope the time, and getting through suitable adjustment can capacitor C
1With the dividing potential drop capacitor C
2~ C
N, all can realize getting ability.
Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although the utility model has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can make amendment or be equal to replacement the embodiment of the utility model; And do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of the claim scope of the utility model.
Claims (10)
1. energy taking device based on capacitor voltage divider; It is characterized in that: this device comprises capacitor voltage divider, transformation rectification unit and power conversion unit, and the input of said transformation rectification unit links to each other with the output of capacitor voltage divider, its output links to each other with the input of power conversion unit; The alternating current that said capacitor voltage divider will pass through dividing potential drop exports the transformation rectification unit to, is converted into direct current, carries out exporting after voltage stabilizing, the Filtering Processing through power conversion unit again.
2. energy taking device as claimed in claim 1; It is characterized in that: said capacitor voltage divider comprises each electric capacity that is series between high voltage bus and the earth: one of them electric capacity can electric capacity for getting, all the other electric capacity are dividing potential drop electric capacity; From alternating current that high voltage bus obtained after dividing potential drop electric capacity carries out dividing potential drop, from get can electric capacity the two ends output AC.
3. energy taking device as claimed in claim 2 is characterized in that: an end of first electric capacity in said each electric capacity links to each other with high voltage bus, an end ground connection of last electric capacity, series connection each other between each electric capacity.
4. like claim 2 or 3 described energy taking devices, it is characterized in that: said get can electric capacity and dividing potential drop electric capacity all adopt cylindric planar high voltage capacitor, promptly form by two circular parallel plate electrodes and the dielectric that is filled between two-plate.
5. like claim 2 or 3 described energy taking devices, it is characterized in that: said get can electric capacity and dividing potential drop electric capacity be installed in the post insulator that has full skirt.
6. energy taking device as claimed in claim 1 is characterized in that: be provided with the piezo-resistance that is used to eliminate resonance between the input of the output of said capacitor voltage divider and transformation rectification unit.
7. like claim 1 or 6 described energy taking devices; It is characterized in that: said transformation rectification unit comprises power frequency reducing transformer and rectifier bridge, and the primary side of said power frequency reducing transformer links to each other with the output of capacitor voltage divider, its secondary side links to each other with the input of rectifier bridge.
8. energy taking device as claimed in claim 7 is characterized in that: said transformation rectification unit comprises dc capacitor and the voltage-stabiliser tube that is connected with the output of rectifier bridge.
9. energy taking device as claimed in claim 1; It is characterized in that: said power conversion unit comprises direct-flow voltage regulation unit and capacitor; Said direct-flow voltage regulation unit converts the direct current of transformation rectification unit output into be suitable for power consumption equipment direct current, and exports power consumption equipment to through behind the capacitor filtering.
10. energy taking device as claimed in claim 9 is characterized in that: said direct-flow voltage regulation unit comprises DC-DC module or the low pressure differential voltage stabilizing chip with wide voltage input.
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