CN1779470A - Electric current tester - Google Patents
Electric current tester Download PDFInfo
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- CN1779470A CN1779470A CN 200410095677 CN200410095677A CN1779470A CN 1779470 A CN1779470 A CN 1779470A CN 200410095677 CN200410095677 CN 200410095677 CN 200410095677 A CN200410095677 A CN 200410095677A CN 1779470 A CN1779470 A CN 1779470A
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Abstract
A current detecting device is prepared as setting current path as form of set part on circuit base board and setting magnetic detecting element at this set part for converting magnetic flow generated as per rate of current to be voltage to achieve purpose of detecting current accurately.
Description
Technical field
The present invention is relevant to utilize magnetic detecting element such as Hall element to detect the current sensing means of electric current, the current sensing means that related detection is for example waited for bus at driven steering device and used when the such needs of motor circuit such as electrical installation detect the sensed current that flows in the circuit of electric current.
Background technology
Utilize in the current sensing means that magnetic detecting element such as Hall element detects electric current existing, have and adopt poly-magnetic magnetic core pattern and need not gather two kinds of patterns such as magnetic magnetic core pattern.
The current sensing means of the described poly-magnetic magnetic core pattern of existing employing for example the spy to open 2002-257867 communique, particularly its Fig. 7 and descriptive item and other parts thereof described, by the current bar (bar) in the path that becomes sensed current, assemble the magnetic flux that produces by the sensed current that flows through this current bar the poly-magnetic magnetic core of C type, and input by the magnetic flux of the poly-magnetic of this poly-magnetic magnetic core and will import magnetic flux and be transformed into Hall element that voltage exports etc. and constitute.Utilize this formation, can obtain current detecting output from the output voltage of described Hall element.I.e. output by described Hall element obtains and the proportional magnitude of voltage of described sensed current.
Existing current sensing means that need not described poly-magnetic core pattern is for example opened as described in 2001-174486 communique, especially its Fig. 1, Fig. 5 and descriptive item thereof and other as the spy, it is described that and for example the spy opens 2003-4771 communique, especially its Fig. 7 and descriptive item and other thereof, as the conductor metal plate in detected circuit path use himself curve U-shaped or] the conductor metal plate of shape, again at the central configuration Hall element of the described bend of this conductor metal plate, thereby output and the proportional voltage of described sensed current.
A kind of current sensing means is arranged again, open as described in flat 9-80081 communique, particularly its Fig. 2 and descriptive item thereof and other as the spy, it is formed on spiral wiring figure on the printed circuit distributing board, the proportional voltage of load current that flows in output of magnetic field detection element and the described spirality wiring graph.
Existing current sensing means since its structure as previously mentioned, so there is problem as follows.
1. the existing problem that adopts the current sensing means of the poly-magnetic magnetic core of C shape.
Owing to the poly-magnetic magnetic core self of described C shape weighs greatly, also weigh greatly so have the current sensing means of the poly-magnetic magnetic core of this C shape.Therefore this massive current sensing means is contained in require on small and light control device, the particularly control apparatus of vehicle not too suitable.In addition, also open as described in the 2002-257867 communique as the spy, the number of spare parts of this pattern is many, and the assembly work amount is big, so the cost height.In addition the hysteresis characteristic that has of magnetic core to current detection accuracy, detect stability harmful effect all arranged.
2. the existing problem that does not adopt the current sensing means of the poly-magnetic magnetic core of C shape.
In order to obtain the practical detection sensitivity of energy, strengthen near the density of the described sensed current of described magnetic detection element, therefore must be near described magnetic detection element the width of the conductor in described sensed current path be done it thinly to a certain degree, to reduce the sectional area of current path.But as the motor of the driven steering device of vehicle more than several abamperes during bigger electric current, described sensed current path conductor also has bigger electric current to flow through near described magnetic detection element in test example.Therefore, as previously mentioned, as described near the magnetic detection element with as described in the sensed current path as described in the width of conductor do it thinly to a certain degree, to reduce the sectional area of current path, worry that then heat is concentrated near the described magnetic detection element.
In addition, when described current sensing means is the current sensing means that is contained on vehicle etc., usually owing to will described sensed current path conductor and described magnetic detection element being fixed and encapsulate, so the problem that exists the problem of dispelling the heat, the problem of volume increase or the problem that cost increases etc. can not be ignored with methods such as resin-casts.
Again because of the control circuit of on described current sensing means and the substrate circuit that will detect electric current being controlled structurally is separately an absolute construction body, thus also have the installation of current sensing means or need current sensing means and the control circuit substrate be connected problem such as distribution.
Summary of the invention
When the present invention's purpose is to cut down parts expense and millwright, simultaneously also try hard to reduce volume, and can stablize to reach and detect electric current accurately.
The current sensing means that the application relates to comprise with flow through the sensed current that becomes detected object and utilize the circuit (100) of fin (11) heat radiation be electrically connected and flow through described sensed current current path (14) and will be according to the size of the described sensed current that flows through on this current path (14) and the magnetic flux of corresponding generation is transformed into the magnetic detection element (17) of voltage; In the current sensing means of this described magnetic detection element (17) the output voltage corresponding with described sensed current
Described current path (14) is gone up at the good substrate (12) of the thermal conductivity that constitutes described circuit (100) across thermal conductivity good insulation performance layer (13) and is formed lamelliform,
The part (141) of described filmated current path (14) has discontinuously many slits (151) of extending, and relies on this many slits to make the circular arc current path (152) of the shape at this regulation position (16) of encirclement in order to make the regulation position (16) of flux concentrating on described substrate (12)
Described substrate (12) and described heat radiator (11) joint that carries out described circuit (100) heat radiation, by this joint, the heat radiation of the part (141) of described current path (14) is just through described insulation course (13) and described substrate (12), dispel the heat by the described heat radiator (11) that carries out described circuit (100) heat radiation
Described magnetic detection element (17) is configured in a side opposite with described heat radiator (11) of described substrate (12), makes the described regulation position (16) of itself and described flux concentrating relative.
The circuit that need detecting the power such as motor drive circuit, power circuit of electric current or power control circuit and so on needs to detect electric current originally just is equipped with diffusing pad under most situation, be used for efficiently distributing the heat that the power control by forming circuit produces with semiconductor element.
The present invention is by the public heat radiator that will detect the circuit of described electric current, and distributes the heat that produces when sensed current such as motor current flows on the current path figure effectively, can stably detect electric current with smaller volume.Especially when adopting described power control with described circuit to be configured in formation on the electric wiring substrates such as metal substrate (aluminium base) or ceramic substrate with semiconductor element, be a kind of quite effectively means.
Other purpose, feature and advantage of the present invention will fully understand following detailed description of the present invention through the reference accompanying drawing.
Description of drawings
Fig. 1 is the simplified diagram of the formation of expression the invention process form 1, and its (A) is vertical view, (B) is side view.
Fig. 2 is the side view of the formation of expression the invention process form 2.
Fig. 3 is the side view of the formation of expression the invention process form 3.
Embodiment
Example 1
Below, with reference to description of drawings the invention process form 1.Fig. 1 represents the pie graph of example 1 for summary, (A) is that planimetric map, (B) are side view.
As shown in the drawing, the sensed current such as output current of circuit (100) such as the motor drive circuit of the current sensing means of example 1 (1) detection needs detection electric current, for example inverter.The size of the output of this current sensing means (1) is owing to being and the corresponding size of detected size of current, so the output of this current sensing means (1) is used in the occasion of for example controlling the described sensed current such as output current of described circuit (100) by controller (200).
Described circuit (100) is to go up across serving as a contrast the insulation courses such as epoxy film (13) about 70 μ m and constituting at the aluminium base (12) that the heat radiator (11) that can distribute the heat that oneself produces is arranged.In addition, the output current of circuit (100) such as described inverter is supplied with motor even load M by current path (14).
Form sensed current graphics path (14) going up, as the current path (14) of the sensed current of described circuit (100) with the public aluminium base (12) of described circuit (100).This sensed current graphics path (14) is for example made with the Copper Foil about thick 80 μ m.On the Copper Foil of the part (141) of this sensed current graphics path (14), shown in shape among the figure, many slits (151) about wide 0.2mm are set discontinuously.Utilize these discontinuous slits (151), shown in Fig. 1 (A), forming with regulation position (16) be circular arc current path (152), and the heat dissipation region (153) of this circular arc current path (152) of encirclement at center.Described circular arc current path (152) and described heat dissipation region (153) continuously, are utilized this continuous part between described discontinuous slit (151), both connections of dispelling the heat.Also have, run through the through hole (154) of described Copper Foil in central authorities' formation of described circular arc current path (152).
As shown by arrows, flow through described sensed current on the described current path (14) by described circular-arc current path (152).
The result, owing to produce the magnetic flux that numerical value and sensed current are in proportion at the position (16) of described regulation, so by at regulation position (16) or the magnetic detection element Hall element (17) for example that magnetic flux density is transformed into voltage is set near it, thereby can obtain and the proportional voltage of sensed current is exported.Also have, the example of representing among Fig. 1 is, the inspection center of described magnetic detection element (17) is consistent with described regulation position (16), and described magnetic detection element (17) covers described through hole (154) on a side opposite with described heat radiator (11).
(18) for operation voltage being added in voltage source on the described magnetic detection element (17), (19) are the lead-in wire of the voltage output of taking out magnetic detection element (17), connect to be used for the pad (20) that joins with aluminium base (12).The voltage output of magnetic detection element (17) utilizes amplifying circuit (21) to be amplified to required degree, as being taken out to the outside, input to detection current input terminal (not shown) of described controller (200) with the big or small corresponding voltage output (22) of sensed current.Described controller (200) utilizes the size of described sensed current and other control signal, controls the described sensed current of described circuit (100).
Also have, magnetic flux density hypothesis that the electric current that utilization is flowed around the regulation position (16) of sensed current graphics path (14) produces at the position (16) of regulation and electric current big or small identical, then the radius of circular arc current path (152) is more little, and magnetic flux density is just big more.Therefore, diameter around the described circular arc current path (152) of described sensed current graphics path (14) is done little, or the width of described circular arc current path (152) run business into particular one, can increase detection sensitivity like this.But, as with as described in current path (14) as described in circular arc current path (152) around diameter do little, the path width of described circular arc current path (152) is run business into particular one, and then when big electric current flow through this circular arc current path (152), this position will excessive heating.Therefore, form described slit (151) by going up at described sensed current graphics path (14) discontinuously at suitable position, thereby the path that detected circuit flows is concentrated on the inner circumferential side of circular arc current path (152), simultaneously, in heat conduction because and the conductor fig in the outside be that heat dissipation region (153) maintenance contacts fully, so can guarantee its heat dispersion.Finally, can increase near the current density of the sensed current of described magnetic flux detecting element (17) check point, improve detection sensitivity fully.
Be that the current sensing means of the invention process form 1 comprises and flowing the sensed current that becomes detected object and utilizing the circuit (100) of heat radiator (11) heat radiation to be electrically connected and to flow through the current path (14) of described sensed current, and will be according to the size of the described sensed current that flows through on this current path (14) and the corresponding magnetic flux that produces is transformed to the magnetic detection element (17) of voltage, in the current sensing means of described magnetic detection element (17) the output voltage corresponding with described sensed current, described current path (14) is gone up at the good substrate (12) of the thermal conductivity that constitutes described circuit (100) across thermal conductivity good insulation performance layer (13) and is formed lamelliform, the part (141) of described filmated current path (14) has many slits (151) of extending discontinuously, with rely on this many slits (151) and give the circular arc current path (152) that the shape at this regulation position (16) of encirclement is made at regulation position (16) on the described substrate (12) in order to make flux concentrating, described substrate (12) and described heat radiator (11) joint that carries out described circuit (100) heat radiation, utilize this joint, the heat radiation of the part (141) of described current path (14) can be through described insulation course (13) and described substrate (12), described heat radiator (11) by the heat radiation of carrying out described circuit (100) carries out, described magnetic detection element (17) is configured in a side opposite with the described heat radiator (11) of described substrate (12), makes its described regulation position (16) with described flux concentrating relative.In addition, the part (141) of described lamelliform current path (14) has the heat dissipation region (153) of utilizing described many slits (151) of extending discontinuously to form continuously together with described circular arc current path (152) at described circular arc current path (152) on every side, the heat that is produced by the sensed current that flows through in the described circular arc current path (152) dispels the heat from described heat radiator (11) through described heat dissipation region (153), described insulation course (13) and described substrate (12).In addition, the part (141) of described lamelliform current path (14) has the through hole (154) coaxial with described regulation position (16), form described circular arc current path (152) around described through hole (154), described magnetic detection element (17) is configured to cover described through hole (154).
Utilize described formation,, thereby can distribute the heat that produces when sensed current such as motor current flows through the current path figure effectively, stably detect electric current with smaller volume by the public heat radiator that need to detect the circuit of described electric current.
In other words, example 1 of the present invention has following characteristics.Go up formation circuit (100) and the current path that is connected this circuit (100) (14) at substrate (12).The described current path (14) of this formation is configured to surround the shape at the regulation position (16) on the described substrate (12).Near described regulation position (16) or its, configuration will be transformed into the magnetic detection element (17) of voltage according to the magnetic flux of the corresponding generation of size institute of electric current.The heat radiation of the heat radiation of described circuit (100) and described current path (14) is dispelled the heat by public heat radiator (11) by described substrate (12).Adopt such formation, in the time of cutting down parts cost and millwright as far as possible, and with the volume obtained performance of minimum is stable, precision is high non-contact type current pick-up unit.
Example 2
Following with reference to description of drawings example 2 of the present invention.Fig. 2 is the side view of the formation of expression example 2.Vertical view owing to identical omission of Fig. 1 (A).
In addition, among Fig. 2, the identical label of mark on the part identical or suitable with Fig. 1, it illustrates omission.Be that with the difference of Fig. 1 it constitutes, replace aluminium base (12) with multilayer ceramic substrate 30 (Fig. 2 represents 4 layers example), the current detection circuit that Fig. 1 (A) illustrates is configured on the ground floor 30a of this multilayer ceramic substrate 30, also form identical shaped current path figure (14) on each layer of second layer 30b～4th layer 30d, simultaneously, path as much as possible (interlayer bonding conductor) (31) is set, to be electrically connected and the heat conduction connection between the last sensed current graphics path (14) that forms of each layer, reduce the resistance and the thermal resistance of sensed current graphics path (14).Also has (32) thermal conductivity good insulation performance adhesive linkage for multilayer ceramic substrate (30) and heat radiator (11) are combined.
Be that the current sensing means of example 2 of the present invention comprises and flows through the sensed current that becomes detected object and utilize the circuit (100) of heat radiator (11) heat radiation to be electrically connected and to flow through the current path (14) of described sensed current, with will be according to the size of the described sensed current that flows through at this current path (14) and the magnetic flux of corresponding generation is transformed into the magnetic detection element (17) of voltage, in the current sensing means of described magnetic detection element (17) the output voltage corresponding with described sensed current, described current path (14) has the multilager base plate (30a) that is arranged on the described heat radiator (11), (30b) ... each layer on circular arc current path (152a), (152b), described each circular arc current path (152a) of described each substrate, (152b) ... utilize interlayer bonding conductor (31) to be electrically connected, make by the described circular arc current path (152a) that flows through each layer, (152b) ... the magnetic flux addition that sensed current produced, the corresponding action of magnetic flux after described magnetic detection element (17) and the described addition.
Adopt above-mentioned formation, can increase the measured current value of allowing.
Example 3
Following with reference to description of drawings example 3 of the present invention.Fig. 3 is for the synoptic diagram of the formation of expression example 3, and is the same with example 2, adopts multilayer ceramic substrate (30) (Fig. 3 represents 5 layers example).Among Fig. 3, mark same label with Fig. 1 (A) and the identical or suitable part of Fig. 2, it illustrates omission.With Fig. 2 difference be, its structure is made can be with high precision, low-cost less (following about the 10 amperes) electric current that detects, form respectively on each layer (30a)～(30e) of multilayer ceramic substrate (30) among the circular arc current path (152a)～(152e) at the regulation position (16) of sensed current graphics path, the bs of top portion that connects the circular arc current path (152b) of the terminal part ae of circular arc current path (152a) of ground floor and the second layer with path (interlayer bonding conductor) (31), use path (interlayer bonding conductor) to connect the cs of top portion of the circular arc current path (152c) of the terminal part be of circular arc current path (152b) of the second layer and the 3rd layer again, below similarly use path (interlayer bonding conductor) to connect the top portion of the circular arc current path of the terminal part of circular arc current path on upper strata and its lower floor, thereby the current path of each layer is connected in series, the whole shape that forms the multi-turn coil.
When electric current flow through the sensed current path of such formation, the size of the magnetic flux density of coiled type current path center and the number of turns of coil were proportional.Promptly as shown in Figure 3, by the sensed current graphics path (152a)～(152e) of sandwich construction is made the multi-turn coil shape, thereby can be without magnetic core etc., improve current detecting sensitivity with lower cost, improve the accuracy of detection of little galvanic areas.
Also have, the shape of the sensed current graphics path (14) shown in Fig. 1～Fig. 3 and slit (151) is an example, the sensitivity of physical property, thickness or the Hall element of the metal of characteristics such as the current value that certain basis will be handled, the thermal resistance of substrate, formation sensed current graphics path etc., emulation by magnetic and heat can determine best shape.
In addition, in the above explanation, with the Hall element be example as magnetic detection element (17), but also can expect to obtain same effect with other magnetic detection element.In addition, adopt that amplifying circuit is packed in the resin-cast body of Hall element is that so-called Hall IC also can similarly constitute.
The detailed description of preferred embodiment of the present invention and object lesson only are used for explanation, as long as within the spirit and scope of the present invention, those skilled in the art certainly carries out many variations and modification to above-mentioned specific descriptions.
Claims (8)
1. a current sensing means is characterized in that
Comprise with flow through the sensed current that becomes detected object and utilize the circuit 100 of heat radiator 11 heat radiation to be electrically connected and flow through described sensed current current path 14 and will be according to the size of the described sensed current that flows through on this current path 14 and the magnetic flux of corresponding generation is transformed into the magnetic detection element 17 of voltage, in the current sensing means of this described magnetic detection element 17 outputs voltage corresponding with described sensed current
Described current path 14 forms lamelliform across thermal conductivity good insulation performance layer 13 on the good substrate 12 of the thermal conductivity of the described circuit 100 of formation,
The part 141 of described filmated current path 14 has discontinuously many slits 151 of extending, and relies on these many slits to make the circular arc current path 152 of the shape of surrounding this regulation position 16 in order to make the regulation position 16 of flux concentrating on described substrate 12
Described substrate 12 and described heat radiator 11 joints that carry out described circuit 100 heat radiations, by this joint, the heat radiation of the part 141 of described current path 14 is dispelled the heat by the described heat radiator 11 that carries out described circuit 100 heat radiations just through described insulation course 13 and described substrate 12
The side opposite with described heat radiator 11 that described magnetic detection element 17 is configured in described substrate 12 makes the described regulation position 16 of itself and described flux concentrating relative.
2. current sensing means as claimed in claim 1 is characterized in that,
The part 141 of described filmated current path 14 has the heat dissipation region 153 of utilizing described many slits 151 of extending discontinuously to form continuously together with described circular arc current path 152 around described circular arc current path 152,
The heat that produces by the sensed current that flows through on the described circular arc current path 152 through described heat dissipation region 153, described insulation course 13, and described substrate 12 from described heat radiator 11 heat radiations.
3. current sensing means as claimed in claim 2 is characterized in that,
The part 141 of described filmated current path 14 has the through hole 154 coaxial with described regulation position 16,
Around described through hole 154, form described circular arc current path 152,
Described magnetic detection element 17 is configured to cover described through hole 154.
4. current sensing means as claimed in claim 3 is characterized in that,
The inspection center of described regulation position 16 and described magnetic detection element 17 is coaxial.
5. a current sensing means is characterized in that,
Comprise with flow through the sensed current that becomes detected object and utilize the circuit 100 of heat radiator 11 heat radiation to be electrically connected and flow through described sensed current current path 14 and will be according to the size of the sensed current that flows through on this current path 14 and the magnetic flux of corresponding generation is transformed into the magnetic detection element 17 of voltage, in the current sensing means of this described magnetic detection element 17 outputs voltage corresponding with described sensed current
Described current path 14 have the multilager base plate that is arranged on the described heat radiator 11 (30a, 30b ...) the circular arc current path that go up to be provided with of each layer (152a, 152b ...),
The described circular arc current path of described each substrate (152a, 152b ...) utilize interlayer bonding conductor 31 to be electrically connected, make by the described circular arc current path that flows through each layer (152a, 152b ...) the magnetic flux addition that produces of sensed current,
The corresponding action of magnetic flux after described magnetic detection element 17 and the described addition.
6. current sensing means as claimed in claim 5 is characterized in that,
Described interlayer bonding conductor 31 has good thermal conductivity,
Described a plurality of circular arc current path (152a, 152b ...) among, the described circular arc current path 152d that is positioned at its certain one deck end dispels the heat with described heat radiator 11 by insulation course 32 and is connected,
Remaining described circular arc current path (152a～152c) dispels the heat with described heat radiator 11 by described interlayer bonding conductor 31 and is connected,
Described a plurality of circular arc current path (152a, 152b ...) among, on a side opposite of the described circular arc current path (152a) that is positioned at its another layer end, described magnetic detection element 17 is set with described heat radiator 11.
7. current sensing means as claimed in claim 5 is characterized in that,
The described circular arc current path 152 of each layer is connected in series by described interlayer bonding conductor 31.
8. current sensing means as claimed in claim 5 is characterized in that,
The terminal of adjacent described circular arc current path (152) (ae, be ...) and top (bs, cs ...) connect by described interlayer bonding conductor 31, connect by this, the described circular arc current path 152 of each layer is made as a whole formation coil shape.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100956774A CN100489542C (en) | 2004-11-19 | 2004-11-19 | Electric current tester |
| HK06111698.6A HK1091265A1 (en) | 2004-11-19 | 2006-10-24 | Vehicle current detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100956774A CN100489542C (en) | 2004-11-19 | 2004-11-19 | Electric current tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1779470A true CN1779470A (en) | 2006-05-31 |
| CN100489542C CN100489542C (en) | 2009-05-20 |
Family
ID=36769869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100956774A Expired - Fee Related CN100489542C (en) | 2004-11-19 | 2004-11-19 | Electric current tester |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100489542C (en) |
| HK (1) | HK1091265A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872759A (en) * | 2017-02-24 | 2017-06-20 | 广东顺德工业设计研究院(广东顺德创新设计研究院) | Current path detection means and current path detection method |
| CN107209218A (en) * | 2015-02-11 | 2017-09-26 | 脉冲电子股份有限公司 | Electric Arc fault current sensor and system |
-
2004
- 2004-11-19 CN CNB2004100956774A patent/CN100489542C/en not_active Expired - Fee Related
-
2006
- 2006-10-24 HK HK06111698.6A patent/HK1091265A1/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107209218A (en) * | 2015-02-11 | 2017-09-26 | 脉冲电子股份有限公司 | Electric Arc fault current sensor and system |
| CN106872759A (en) * | 2017-02-24 | 2017-06-20 | 广东顺德工业设计研究院(广东顺德创新设计研究院) | Current path detection means and current path detection method |
| CN106872759B (en) * | 2017-02-24 | 2019-04-05 | 广东顺德工业设计研究院(广东顺德创新设计研究院) | Current path detection device and current path detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1091265A1 (en) | 2007-01-12 |
| CN100489542C (en) | 2009-05-20 |
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