CN109581244A - High-power portable noninductive load case - Google Patents
High-power portable noninductive load case Download PDFInfo
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- CN109581244A CN109581244A CN201811249221.7A CN201811249221A CN109581244A CN 109581244 A CN109581244 A CN 109581244A CN 201811249221 A CN201811249221 A CN 201811249221A CN 109581244 A CN109581244 A CN 109581244A
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- Prior art keywords
- noninductive
- power
- thermally conductive
- load
- power resistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The present invention relates to a kind of high-power portable noninductive load casees, belong to power supply test technical field.Including front panel and radiator, pcb component and noninductive power resistor unit are equipped between front panel and radiator, noninductive power resistor unit two sides are equipped with left and right handle, noninductive power resistor unit side is fixedly connected with radiator back, the pin of noninductive power resistor and pcb component are electrically connected in noninductive power resistor unit, jack is opened up on front panel, load output wiring terminal and branch resistance reference point binding post are plugged in jack, it loads output wiring terminal and pcb component is electrically connected, upper and lower cover plates is equipped between the handle of left and right, upper and lower cover plates is fixedly connected with noninductive power resistor unit.A kind of high-power portable noninductive load case, have the characteristics that it is passive, noninductive, nonpolarity, high-power and portable, can trouble free service in Unisolated switch power supply band carry Characteristics Detection, can be widely applied to various power supplys conducted noise test etc. occasions.
Description
Technical field
The present invention relates to a kind of high-power portable noninductive load case, the works such as index test when carrying for low frequency source band
Make, belongs to technology power supply test technical field.
Background technique
With test power source performance, load is one of essential instrument.Either source effect, load effect, power supply
The test of working efficiency etc. all be unable to do without power source loads.Type that there are many loads that can be used in testing, the most commonly used is
Electronic load class.Electronic load has several working ways, and load value output size is continuously adjustable, light-weight easy to carry,
Advantage is very more.But disadvantage it is also obvious that first load should be it is passive, but electronic load be it is active, need external electrical
Net power voltage supply could work；It is non-polar for loading, but electronic load polarized；The impedance of load is in certain frequency
It is determining in range, but electronic load is uncertain.
Electronic load is the conduction amount by control internal power or transistor, consumes electricity by the dissipated power of power tube
The equipment of energy.Simultaneously can be with fictitious load short circuit, and can be perception, capacitive and resistive with fictitious load.
The load for meeting voltage delay current characteristics is generally called capacitive load, voltage cannot be mutated when charge and discharge.Its
Corresponding power factor is negative value.Refer to that load imaginary part is the load of negative value in high frequency field.The power factor of inductive load is
Positive value.Theoretically, pure resistor element circuit, purely capacitive circuit and pure inductive circuit are not present within the scope of full frequency-domain.
Another more commonly used load is slide-wire rheostat, because its it is passive it is nonpolarity can be applied to more occasions, lack
Point is that its inductance is larger and, it is apparent that influencing measurement result.
Summary of the invention
It is noninductive negative the technical problem to be solved by the present invention is to provide a kind of high-power portable for the above-mentioned prior art
Carry case, have the characteristics that it is passive, noninductive, nonpolarity, high-power and portable, can trouble free service in Unisolated switch power supply band load
Characteristics Detection can be widely applied to the occasions such as the conducted noise test of various power supplys, and the purely resistive that also can be used as low-frequency power is negative
It carries and uses.
The present invention solves the above problems used technical solution are as follows: a kind of high-power portable noninductive load case, including
Front panel, radiator, noninductive power resistor unit and pcb component, form between the front panel and radiator rear panel
Internal chamber is equipped with pcb component and noninductive power resistor unit, the noninductive power in the chamber from front to back
Resistance unit two sides are fixed with left and right handle, and the noninductive power resistor unit side is fixedly connected with radiator rear panel, institute
It states the pin of noninductive power resistor and pcb component in noninductive power resistor unit to be electrically connected, be opened on the front panel
If the jack of spaced set, is corresponded in the jack and plug load output wiring terminal and branch resistance reference point wiring
Column, the load output wiring terminal and pcb component are electrically connected, and upper and lower cover plates, institute are equipped between the left and right handle
Upper and lower cover plates is stated to be fixedly connected with noninductive power resistor unit.
The noninductive power resistor unit includes noninductive power resistor and a plurality of thermally conductive item, and a plurality of thermally conductive item is equidistant
It is uniformly distributed and both ends is aligned setting respectively, the thermally conductive item is arranged vertically with load output wiring terminal, a plurality of thermally conductive item
Both ends are fixed with positioning strip respectively, and the thermally conductive upper and lower surface uniformly fixes noninductive power resistor respectively, close to the print
The thermally conductive side setting insulation support bar of brush circuit board module side, the thermally conductive item are fixedly connected with radiator.
The pcb component includes the second printed wiring board of the first printed wiring board and muti-piece, first printing
It is not attached among wiring board conductor, realizes multiple noninductive power resistor series connection, pass through among the second printed wiring board conductor
High current connecting wire is connected, and realizes and connects after multiple noninductive power resistors are first in parallel, first printed wiring board and second
The hole for wearing load output wiring terminal is opened up in printed wiring board respectively, the pcb component, which is equipped with, covers copper,
For loading the electric connection of output wiring terminal and pcb component.
Multiple first support bars are equipped between the front panel and pcb component, first support bar opens up more
A card slot, and pocket numbers are corresponding with the load output wiring terminal quantity of vertical arrangement, the card slot is fastened on load output
Wiring column bottom.
The thermally conductive quantity is set as 12, and insulation support bar is fixed on thermally conductive item described in a portion,
It plays a supporting role, is easily installed in structure installation process.
Heat release hole is opened up respectively on the left and right handle.
Jack on the front panel opens up 91, and 13 rows, the branch resistance reference is laterally arranged in longitudinally disposed 7 column
The corresponding jack of point binding post is located at the bottom of front panel, and quantity is 6, remaining is the corresponding jack of load output wiring terminal.
Heat-conducting silicone grease is respectively coated between the noninductive power resistor and thermally conductive item and on the contact surface of thermally conductive item and radiator,
Improve heat transfer effect.
Part is made using aluminium material in the radiator, and part is made using red copper material in the thermally conductive item.
The pin of the noninductive power resistor sets the bending there are two opposite direction, and single bending angle is 135 °.
Compared with the prior art, the advantages of the present invention are as follows: a kind of high-power portable noninductive load case, the load each
The impedance magnitude on road is fixed, and impedance depends primarily on the frequency characteristic of the power component of selection, rationally selects noninductive power
Component production, can be made into the noninductive load case of different characteristics；Not only there is passive, nonpolarity, high-power, box house to be electrically connected
It connects and introduces the features such as inductance is small, and energy trouble free service carries Characteristics Detection in the band of Unisolated switch power supply, can be widely applied
In occasions such as the conducted noise tests of various power supplys, the purely resistive load that also can be used as low-frequency power is used, and effectively avoids small letter
The interference components problem of introducing is loaded in number test process.
Detailed description of the invention
Fig. 1 is a kind of integral outer structural schematic diagram of high-power portable noninductive load case of the embodiment of the present invention；
Fig. 2 is a kind of side view of high-power portable noninductive load case of the embodiment of the present invention；
Fig. 3 is a kind of explosive view of each component of high-power portable noninductive load case of the embodiment of the present invention；
Fig. 4 is a kind of schematic diagram of the pcb component of high-power portable noninductive load case of the embodiment of the present invention；
Fig. 5 is pcb component and noninductive power in a kind of high-power portable noninductive load case of the embodiment of the present invention
Resistance, thermally conductive item and the connection figure for loading output wiring terminal；
Fig. 6 is to remove the connection figure after thermally conductive item in Fig. 5；
Fig. 7 is noninductive power resistor, thermally conductive item, positioning in a kind of high-power portable noninductive load case of the embodiment of the present invention
The structure chart of item and insulating supporting item；
Fig. 8 is the three-dimensional figure of Fig. 7；
Fig. 9 is to remove the side view after a side grip in a kind of high-power portable noninductive load case of the embodiment of the present invention；
Figure 10 is noninductive power resistor, insulating supporting in a kind of high-power portable noninductive load case of the embodiment of the present invention
Item, the top view for loading output wiring terminal and pcb component；
Figure 11 is noninductive power resistor in a kind of high-power portable noninductive load case of the embodiment of the present invention, thermally conductive item and determines
The structure three-dimensional figure of position item；
Figure 12 is the part three removed after radiator in a kind of high-power portable noninductive load case of the embodiment of the present invention
Dimension figure；
A curve in Figure 13 is that noninductive power electricity is selected in a kind of high-power portable noninductive load case of the embodiment of the present invention
The derating curve of resistance；
1 front panel, 2 handles, 3 radiators, 4 load output wiring terminals, 5 branch resistance reference point binding posts, 6 lids in figure
Plate, 7 pcb components, 8 noninductive power resistor units, 9 first support bars, 10 second printed wiring board, 11 noninductive power
Resistance, 12 thermally conductive items, 13 positioning strips, 14 insulation support bars, 15 first printed wiring board, 16 cover copper, 17 heat release holes, 18 pins,
19 high current connecting wires.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As shown in Figure 1, one of the present embodiment high-power portable noninductive load case, including front panel 1, radiator 3,
Noninductive power resistor unit 8 and pcb component 7 form internal chamber, chamber between 3 backboard of front panel 1 and radiator
It is inside equipped with pcb component 7 and noninductive power resistor unit 8 from front to back, noninductive 8 two sides of power resistor unit pass through spiral shell
Nail is fixedly connected with left and right handle 2, and noninductive 8 side of power resistor unit is fixed by screws with 3 backboard of radiator, noninductive function
The pin 18 and pcb component 7 of the noninductive power resistor 11 of rate resistance unit 8 are electrically connected, and are opened up on front panel 1
The jack of spacing setting, longitudinally disposed 7 column, is laterally arranged 13 rows, is inserted into 6 branch resistances in the jack of 1 bottom of plate in front
Reference point binding post 5, the interior insertion load output wiring terminal 4 of remaining jack, all load output wiring terminals 4 and printed wire
Board group part 7 is electrically connected, and the upper and lower ends between left and right handle 2 are equipped with upper and lower cover plates 6, upper and lower cover plates 6 by screw with it is noninductive
Power resistor unit 8 is fixedly connected, and forms cabinet.
Above-mentioned noninductive power resistor unit 8 includes horizontal positioned thermally conductive item 12,12 of noninductive power resistor 11 and 12
Thermally conductive item 12 is equidistantly uniformly distributed from top to bottom, and thermally conductive item 12 is arranged vertically with load output wiring terminal 4,12 thermally conductive items 12
Both ends are aligned and both ends are by positioning screw difference stationary positioned item 13, and it is complete that thermally conductive 12 upper and lower surface of item passes through fastening screw respectively
At the physical connection of noninductive power resistor 11 and thermally conductive item 12,12 side of thermally conductive item close to 7 side of pcb component is pressed
Suitable position setting insulation support bar 14, plays a supporting role in structure installation process, is easily installed.Thermally conductive item 12 passes through spiral shell
Silk is fixedly connected with radiator 3, has the thermally conductive item 12 of insulation support bar 14 to install screw than the thermally conductive item peace without insulation support bar
Fill the long 10mm of screw.
Above-mentioned pcb component 7 includes first the second printed wiring board of printed wiring board 15 and 11 piece 10, the first print
It is not attached among 15 conductor of brush wiring board, realizes that multiple noninductive power resistors 11 are connected, among 10 conductor of the second printed wiring board
It is connected by high current connecting wire 17, realizes and connect after multiple noninductive power resistors 11 are first in parallel, the first printed wiring board 15
With the hole for wearing load output wiring terminal 4 is opened up in the second printed wiring board 10 respectively, pcb component 7 is equipped with
Copper 16 is covered, load output wiring terminal 4 is directly connect with the copper 16 that covers on pcb component 7 using stud and nut, completed
The output function of load resistor value.High current connecting wire between the pin 18 and connection printed wiring board of noninductive power resistor 11
17, which are welded on printed wiring board by scolding tin, covers on the pad of 17 bronze medals, has maximally reduced noninductive power resistor 11 to load
Lead-in inductance between output wiring terminal 4.
7 the first support bars 9,9 Vertical Square of the first support bar are equipped between above-mentioned front panel 1 and pcb component 7
13 card slots are opened up upwards, card slot is fastened on load 4 bottom of output wiring terminal and are secured with nuts.
Heat release hole 17 is opened up on left and right handle 2 respectively, good heat dissipation can reduce the variation of noninductive power resistor resistance value, mention
For stable load impedance.
Thermal conductive silicon is respectively coated between noninductive power resistor 11 and thermally conductive item 12 and on thermally conductive item 12 and the contact surface of radiator 3
Rouge improves heat transfer effect.
Part is made using aluminium material in radiator 3, and thermally conductive item 12 is made part using red copper material, utilizes aluminium and copper material specific heat
Hold different features, by red copper material is thermally conductive and aluminium high surface area radiates connected applications, obtains noninductive power resistor 11 most
Good heat conduction and heat radiation effect, the stability and reliability of enhancing load box work.
The pin 18 of noninductive power resistor 11 sets the bending there are two opposite direction, and single bending angle is 135 °, is used
The stress of copper 16 is covered to wiring board when reducing noninductive power resistor 11 overheat.
The invention utilizes 1 ohm of high-power non-inductive power resistor 11 of TO-220 encapsulating structure, has 85 to bear on front panel 1
Carry output wiring terminal 4 and 6 branch resistance reference point binding post 5, vertical distribution composition 7 mutually independent load resistance series connection
Branch, indicates number 0 beside branch resistance reference point binding post 5, in branch relative to the load output wiring terminal 4 of reference point by
The number on side is the resistance value loaded between output wiring terminal 4 and branch resistance reference point binding post 5, the line of adjacent wiring intercolumniation
For the connection type of branch resistance.Each branch bottom marks number as the branch maximum operating currenbt nominal value of design.See
Table 1:
The design of 1 noninductive load case branch operating current of table
For the heat dissipation effect for ensuring noninductive load case, the operating current of branch is strictly limited, keeps load box reliable and stable
Work.Such as in branch 6, adjacent load output connection intercolumniation has 6 50 watts 1 ohm of resistor coupled in parallel, the resistance after parallel connection are as follows:
In formula: R1=R2=R3=R4=R5=R6=1 Ω
Then all-in resistance are as follows:
The general power of 6 50 watts of resistance are as follows: P=6 × 50W=300W
Rated current are as follows:
Found out by limit curve: when noninductive load box temperature degree is no more than 75 DEG C, the power of noninductive power resistor 11 can only
It is applied to the 60% of general power.The 60% of 300 watts is 180 watts, then electric current are as follows:
The capacity that output wiring terminal 4 itself is loaded when in view of working long hours, takes the maximum operating currenbt of the branch to be
20A.The maximum operating currenbt of other each branches is respectively as follows: 17A, 14A, 10A, 7A and 5A, as shown in table 1.Wherein 5A branch is set
Meter two, this two branch short leads can be such that the maximum resistance value of 5A branch is increased by 12 Ω after 12 Ω binding posts short circuit
To 24 Ω, lighter load is provided for measured source.
Wherein, two 5A branch route the first printed wiring board 15 and constitute；7A branch routes one piece of second 10 structure of printed wiring board
At；10A branch routes two piece of second printed wiring board 10 and constitutes, and is carried out between printed wiring board using row's high current connecting wire 19
It is electrically connected, only welding one arranges noninductive power resistor 11 in one piece of second printed wiring board 10 therein；14A branch routing two pieces the
Two printed wiring board 10 are constituted, and are electrically connected between the second printed wiring board 10 using high current connecting wire 19, noninductive function
Rate resistance 11 is covered in the second printed wiring board；17A branch routes three piece of second printed wiring board 10 and constitutes, the second printed wire
It is electrically connected between plate 10 using two row's high current connecting wires 19, only welding one in one piece of second printed wiring board 10 therein
Arrange noninductive power resistor 11；20A branch routes three piece of second printed wiring board 10 and constitutes, and two are utilized between the second printed wiring board 10
Row's high current connecting wire 19 is electrically connected, and noninductive power resistor 11 is covered on a printed-wiring board.
The load that 7 different capacity branches are constituted by combining in series and parallel, the maximum of each branch is provided by its derating curve
Rated operational current.Principle is introduced in line with the operation is stable and low inductance, plans the electrical connection between heat sink conception and each resistance repeatedly
Method, using the aluminium feature different with copper material specific heat capacity, by red copper material is thermally conductive and aluminium high surface area radiates connected applications,
Power resistor is set to obtain optimal heat conduction and heat radiation effect, the stability and reliability of enhancing load box work.It is drawn in resistance value
In method, it is forbidden to use long conducting wire, using printed wiring board directly by two pins 18 and load box of noninductive power resistor 11
Output terminal be combined together, be integrally formed similar U-typed electric connection structure, maximally reduced external circuit introducing
Inductance.The design thermally conductive item 12 of red copper is vertical with each output branch is loaded to be used, and the noninductive power electricity of each list in branch is made
Resistance 11 uniquely occupies the thermally conductive item 12 of a red copper, and proof load has the thermally conductive item 12 of red copper as much as possible to participate in during working
In the thermally conductive application of branch resistance, the heat conduction and heat radiation effect of noninductive load case is provided.Power designs are according to using middle load resistance
De-rating values when temperature rise is no more than 80 DEG C provide, and see derating curve, thereby guarantee that load box safety and precise under rated current
Work.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (10)
1. a kind of high-power portable noninductive load case, it is characterised in that: including front panel (1) and radiator (3), the front
Internal chamber is formed between plate (1) and radiator (3) backboard, is equipped with pcb component (7) from front to back in the chamber
With noninductive power resistor unit (8), noninductive power resistor unit (7) two sides are fixed with left and right handle (2), described noninductive
Power resistor unit (8) side is fixedly connected with radiator (3) backboard, noninductive power in the noninductive power resistor unit (8)
The pin (18) of resistance (11) and pcb component (7) are electrically connected, and open up spaced set on the front panel (1)
Jack, interior correspond of the jack plugs load output wiring terminal (4) and branch resistance reference point binding post (5), described negative
It carries output wiring terminal (4) and pcb component (7) to be electrically connected, upper and lower cover plates is equipped between the left and right handle (2)
(6), the upper and lower cover plates (6) is fixedly connected with noninductive power resistor unit (8).
2. a kind of high-power portable noninductive load case according to claim 1, it is characterised in that: the noninductive power electricity
Resistance unit (8) includes noninductive power resistor (11) and a plurality of thermally conductive item (12), and a plurality of thermally conductive item (12) is equidistant uniformly to divide
Cloth and both ends are aligned setting respectively, and the thermally conductive item (12) is arranged vertically with load output wiring terminal (4), a plurality of thermally conductive item
(12) both ends are fixed with positioning strip (13) respectively, and thermally conductive item (12) upper and lower surface uniformly fixes noninductive power resistor respectively
(11), described thermally conductive close to thermally conductive item (12) side setting insulation support bar (14) of the pcb component (7) side
Item (12) is fixedly connected with radiator (3).
3. a kind of high-power portable noninductive load case according to claim 1, it is characterised in that: the printed wiring board
Component (7) includes the first printed wiring board (15) and the second printed wiring board of muti-piece (10), first printed wiring board (15)
It is not attached among conductor, realizes multiple noninductive power resistor (11) series connection, lead among the second printed wiring board (10) conductor
Super-high-current connecting wire (19) is connected, and realizes and connects after multiple noninductive power resistors (11) are first in parallel, first track
The hole for wearing load output wiring terminal (4), the printing are opened up on road plate (15) and the second printed wiring board (10) respectively
Circuit board module (7), which is equipped with, covers copper (16), and the electrical property for loading output wiring terminal (4) and pcb component (7) connects
It connects.
4. a kind of high-power portable noninductive load case according to claim 1, it is characterised in that: the front panel (1)
Multiple first support bars (9) are equipped between pcb component (7), first support bar (9) opens up multiple card slots, and
Pocket numbers are corresponding with load output wiring terminal (4) quantity of vertical arrangement, and the card slot is fastened on load output wiring terminal
(4) bottom.
5. a kind of high-power portable noninductive load case according to claim 2, it is characterised in that: the thermally conductive item (12)
Quantity is set as 12, and insulation support bar (14) is fixed on thermally conductive item (12) described in a portion, was installed in structure
It plays a supporting role, is easily installed in journey.
6. a kind of high-power portable noninductive load case according to claim 1, it is characterised in that: the left and right handle
(6) heat release hole (17) are opened up on respectively.
7. a kind of high-power portable noninductive load case according to claim 1, it is characterised in that: the front panel (11)
On jack open up 91, the corresponding jack of the branch resistance reference point binding post (11) is located at the bottom of front panel (11),
Quantity is 6, remaining is the corresponding jack of load output wiring terminal (4).
8. a kind of high-power portable noninductive load case according to claim 2, it is characterised in that: the noninductive power electricity
Heat-conducting silicone grease is respectively coated between resistance (11) and thermally conductive item (12) and on thermally conductive item (12) and the contact surface of radiator (3), improves heat
Transmission effect.
9. a kind of according to claim 1, high-power portable noninductive load case described in 2,5,8, it is characterised in that: the heat dissipation
Part is made using aluminium material in device (3), and part is made using red copper material in the thermally conductive item (12).
10. a kind of high-power portable noninductive load case according to claim 2,3,8, it is characterised in that: described noninductive
The pin (18) of power resistor (11) sets the bending there are two opposite direction, and single bending angle is 135 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811249221.7A CN109581244B (en) | 2018-10-25 | 2018-10-25 | High-power portable noninductive load box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811249221.7A CN109581244B (en) | 2018-10-25 | 2018-10-25 | High-power portable noninductive load box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109581244A true CN109581244A (en) | 2019-04-05 |
| CN109581244B CN109581244B (en) | 2021-03-30 |
Family
ID=65920610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811249221.7A Expired - Fee Related CN109581244B (en) | 2018-10-25 | 2018-10-25 | High-power portable noninductive load box |
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