CN202195824U - Position detection circuit for non-isolation type sine and cosine rotating transformer - Google Patents
Position detection circuit for non-isolation type sine and cosine rotating transformer Download PDFInfo
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- CN202195824U CN202195824U CN201120314394XU CN201120314394U CN202195824U CN 202195824 U CN202195824 U CN 202195824U CN 201120314394X U CN201120314394X U CN 201120314394XU CN 201120314394 U CN201120314394 U CN 201120314394U CN 202195824 U CN202195824 U CN 202195824U
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Abstract
The utility model discloses a position detection circuit for a non-isolation type sine and cosine rotating transformer. The position detection circuit comprises the non-isolation type sine and cosine rotating transformer, wherein input ends and output ends of the non-isolation type sine and cosine rotating transformer commonly utilize a land; all the four output ends of the non-isolation type sine and cosine rotating transformer have direct-current component voltage. Two direct-current component voltage removal amplifying circuits are respectively connected with the two pairs of output ends of the non-isolation type sine and cosine rotating transformer and are used for reducing or removing the direct-current component voltage of the two pairs of output ends. According to the position detection circuit, after being processed, a signal output by the non-isolation type sine and cosine rotating transformer is input to a processing chip, thereby lowering the cost of the position detection circuit.
Description
Technical field
The utility model relates to a kind of rotary transformer, particularly relates to a kind of non-isolated sine and cosine resolver.
Background technology
Rotary transformer (rotary transformer) is called resolver (resolver) again, is used for measuring the anglec of rotation.Rotary transformer has reliability, stability is high, to insensitive advantages of environment such as mechanical vibration, temperature, humidity, is being applied such as the field.For example, in the new-energy automobile field, rotary transformer progressively becomes a kind of position of rotation detecting sensor of main flow.
A kind of typical application of rotary transformer is a sine and cosine resolver.If regard the driving voltage (sinusoidal voltage) of input as a vector, sine and cosine resolver is its two components that are decomposed into quadrature, the literal sense of the English name resolver (resolver) of Here it is rotary transformer.Sine and cosine resolver also can be seen a multiplier as, the driving voltage of input multiply by the sine and the cosine of the anglec of rotation between stator and rotor respectively.Modal a kind of sine and cosine resolver is a magnetoresistance transformer at present, and its schematic diagram is as shown in Figure 1.
Fig. 1 and Fig. 2 have represented two kinds of dissimilar sine and cosine resolvers.Wherein, The alternating voltage of alternating-current voltage source 91 output for
wherein Voffset be DC component voltage; Am, ω,
are respectively maximum amplitude, angular frequency, the initial phase of AC compounent voltage; T is the time, and K1 is an amplification coefficient.AC voltage source 92 output AC voltage is
the cosine resolver is a pair of inputs a, B between the AC voltage
as the excitation voltage.Pair of output sin+, the alternating voltage between the sin-of this sine and cosine resolver is
wherein θ be the stator of this sine and cosine resolver and the anglec of rotation between the rotor, K2 is the amplification coefficient of sine and cosine resolver.Another is
to the alternating voltage between output terminal cos+, the cos-
Sine and cosine resolver shown in Figure 1 has such characteristics: electrical isolation between input end and the output terminal.That is: two input end A, B respectively with alternating- current voltage source 91,92 shared ground; All it doesn't matter between the ground of four output terminal sin+, sin-, cos+, cos-and alternating-current voltage sources 91,92.We are referred to as isolated sine and cosine resolver, are characterized in that position detecting circuit is simple, reliable, uses ripe.
Sine and cosine resolver shown in Figure 2 has such characteristics: a shared ground between input end and the output terminal, electricly do not isolate.That is: two input end A, B respectively with alternating- current voltage source 91,92 shared ground; Four output terminal sin+, sin-, cos+, cos-also with alternating- current voltage source 91,92 shared ground.We are referred to as non-isolated sine and cosine resolver, are characterized in that cost is very low.But its four output terminal sin+, sin-, cos+, cos-have DC component Voffset, and therefore this DC component Voffset can not directly link to each other with process chip generally greater than the maximum operating voltage of subsequent treatment chip.
The utility model content
The utility model technical matters to be solved provides a kind of position detecting circuit of non-isolated sine and cosine resolver, and this circuit can solve the connectivity problem between non-isolated sine and cosine resolver and the process chip.
For solving the problems of the technologies described above, the position detecting circuit of the non-isolated sine and cosine resolver of the utility model comprises:
A non-isolated sine and cosine resolver, a shared ground between its input end and the output terminal; Four output terminals of said non-isolated sine and cosine resolver all have DC component voltage;
Remove the DC component differential amplifier circuit for two, connect two pairs of output terminals of said non-isolated sine and cosine resolver respectively.
In one embodiment; Said removal DC component differential amplifier circuit comprises the operational amplifier of a both-end input, single-ended output at least; The pair of output of said non-isolated sine and cosine resolver connects the positive and negative input end of this operational amplifier respectively; The positive input terminal of this operational amplifier has a DC input voitage; This DC input voitage is less than the DC component voltage of the output terminal of said non-isolated sine and cosine resolver, and the DC component of the output terminal of this operational amplifier is the DC input voitage of the positive input terminal of said operational amplifier.
More specifically; Said removal DC component differential amplifier circuit 3 comprises the operational amplifier 31 of a both-end input, single-ended output, and the pair of output sin+ of non-isolated sine and cosine resolver 2, sin-or cos+, cos-are connected respectively to the positive and negative input end of operational amplifier 31; DC voltage Vdc is connected to the positive input terminal of operational amplifier 31; Has feedback between the negative input end of operational amplifier 31 and the output terminal; The output terminal of operational amplifier 31 and DC voltage Vdc are respectively as the output terminal M, the N that remove DC component differential amplifier circuit 3; The DC component of two output terminal M, N output is provided by the DC voltage Vdc of new introducing.
In another embodiment; Said removal DC component differential amplifier circuit comprises the operational amplifier of two both-end inputs, single-ended output at least; The pair of output of said non-isolated sine and cosine resolver connects the positive input terminal of these two operational amplifiers respectively, and the negative input end of these two operational amplifiers all has a DC input voitage.
More specifically; Said removal DC component differential amplifier circuit 3 comprises the operational amplifier 31,32 of two both-end inputs, single-ended output, and the pair of output sin+ of non-isolated sine and cosine resolver 2, sin-or cos+, cos-are connected respectively to the positive input terminal of two operational amplifiers 31,32; DC voltage Vdc is connected to the negative input end of two operational amplifiers 31,32; All has feedback between the negative input end of two operational amplifiers 31,32 and the output terminal; The output terminal of two operational amplifiers 31,32 is respectively as the output terminal M, the N that remove DC component differential amplifier circuit 3; This is removed in the DC component differential amplifier circuit 3, and two operational amplifiers 31,32 are as two subtracters.
The signal demand of rotary transformer output just can be used for other equipment after changing through process chip.And the output terminal of non-isolated sine and cosine resolver all has bigger DC component voltage; This DC component voltage has exceeded the MWV of subsequent treatment chip usually, thereby the utility model has increased removal DC component differential amplifier circuit especially between non-isolated sine and cosine resolver and process chip.The effect of this removal DC component differential amplifier circuit has two: one, reduces or eliminate the DC component voltage of the output terminal of said non-isolated sine and cosine resolver, makes the maximum amplitude sum of DC component and AC compounent after the processing be less than or equal to the MWV of subsequent treatment chip; The 2nd, the amplitude of the AC compounent voltage of the output terminal of the said non-isolated sine and cosine resolver of amplification.And behind the position detecting circuit that has adopted non-isolated sine and cosine resolver, even it is increased " removing the DC component differential amplifier circuit " module, still lower than the cost that adopts isolated sine and cosine resolver.
Description of drawings
Fig. 1 is the synoptic diagram of isolated sine and cosine resolver;
Fig. 2 is the synoptic diagram of non-isolated sine and cosine resolver;
Fig. 3 is the synoptic diagram of the position detecting circuit of the non-isolated sine and cosine resolver of the utility model;
Fig. 4～Fig. 9 is the different embodiment that remove the DC component differential amplifier circuit in the utility model.
Description of reference numerals among the figure:
1 is the buffer amplifying circuit; 2 is non-isolated sine and cosine resolver; A, B are a pair of input end of sine and cosine resolver; Sin+, sin-are the pair of output of sine and cosine resolver; Cos+, cos-are that another of sine and cosine resolver is to output terminal; 3 for removing the DC component differential amplifier circuit; M, N are for removing the pair of output of DC component differential amplifier circuit; 31,32,33 is operational amplifier; 4 is process chip; 91,92 is alternating-current voltage source.
Embodiment
See also Fig. 3, the position detecting circuit of the non-isolated sine and cosine resolver of the utility model comprises:
A non-isolated sine and cosine resolver 2, its input end A, B and output terminal sin+, sin-, cos+, the shared ground of cos-; Four output terminal sin+ of said non-isolated sine and cosine resolver 2, sin-, cos+, cos-have DC component voltage Voffset;
Remove DC component differential amplifier circuit 3 for two, connect two pairs of output terminals (sin+, sin-) and (cos+, the cos-) of said non-isolated sine and cosine resolver 2 respectively, with the DC component voltage Voffset reduction of these two pairs of output terminals.
Also comprised some auxiliary circuit structures among Fig. 3, introduced as follows:
Non-isolated sine and cosine resolver 2 has two input ends and four output terminals; The differential signal
of input multiply by sine and the cosine of anglec of rotation θ, form the differential signal of two pairs of outputs.A pair of output terminal sin +, sin-differential signal between the output of
the other end on the output cos +, cos-differential signal between the output of
where K2 is not isolated cosine resolver two amplification factor.Four output terminal sin+, sin-, cos+, cos-that it should be noted that non-isolated sine and cosine resolver 2 have DC component Voffset.This is characteristics of non-isolated sine and cosine resolver, and four output terminals of isolated rotary transformer just do not have DC component.
Each is removed DC component differential amplifier circuit 3 and has two input ends and two output terminals.Under a kind of situation; After removing the differential signal amplification of DC component differential amplifier circuit 3 with input; Export the AC signal that has DC component with an output terminal, the maximum amplitude sum of this DC component and AC compounent is less than or equal to the MWV of subsequent treatment chip 4; Another output terminal is exported pure direct current signal, and size is equal to the DC component of previous output terminal.And the differential signal between two output terminals is pure AC signal.Under the another kind of situation; Still with the form output of differential signal, and the maximum amplitude sum of controlling DC component and the AC compounent of two output terminals is less than or equal to the MWV of subsequent treatment chip 4 after removing DC component differential amplifier circuit 3 differential signal of input being amplified.
In the utility model; Remove DC component differential amplifier circuit 3 and can have multiple implementation; Its general thought is divided into two kinds: a kind of is the DC component Voffset that removes these removal DC component differential amplifier circuit 3 input ends, with a new less DC component Vdc output of introducing.Another kind is to use subtraction circuit, exports after reducing the DC component of these removal DC component differential amplifier circuit 3 input ends.
See also Fig. 4, this is a specific embodiment removing DC component differential amplifier circuit 3.Comprise the operational amplifier 31 of a both-end input, single-ended output, the pair of output sin+ of non-isolated sine and cosine resolver 2, sin-(also can be cos+, cos-) respectively are connected to the positive and negative input end of operational amplifier 31 through resistance R 2.DC voltage Vdc is connected to the positive input terminal of operational amplifier 31 through resistance R 1.Connect through resistance R 1 between the negative input end of operational amplifier 31 and the output terminal.The output terminal of operational amplifier 31 is also through capacitor C ground connection.The output terminal of operational amplifier 31 and DC voltage Vdc are respectively as the output terminal M, the N that remove DC component differential amplifier circuit 3.Among this embodiment, the DC component Voffset of two input ends is removed, and the DC component of two output terminal M, N output is provided by the DC voltage Vdc of new introducing.The ac voltage signal
that one of output terminal M output has a DC component wherein K3 is the amplification coefficient of operational amplifier 31.Output terminal N exports a DC voltage Vdc.
Fig. 5 has shown another specific embodiment of removing DC component differential amplifier circuit 3.Compare with Fig. 4, just simply a resistance is split as the series, parallel form of a plurality of resistance, function does not have change.
Fig. 6 has shown another specific embodiment of removing DC component differential amplifier circuit 3.Compare with Fig. 4, just will increase the series, parallel of resistance, electric capacity simply, function does not have change.
Fig. 7 has shown another specific embodiment of removing DC component differential amplifier circuit 3.Compare with Fig. 4, just used two-stage calculation amplifier simply, its objective is the amplification coefficient of raising to the AC signal of input end, function does not have change.
Fig. 8 has shown another specific embodiment of removing DC component differential amplifier circuit 3.Comprise the operational amplifier 31,32 of two both-end inputs, single-ended output, the pair of output sin+ of non-isolated sine and cosine resolver 2, sin-(also can be cos+, cos-) respectively are connected respectively to the positive input terminal of operational amplifier 31, the positive input terminal of operational amplifier 32 through resistance R 11, R21.DC voltage Vdc1 is connected to the negative input end of operational amplifier 31, the negative input end of operational amplifier 32 through resistance R 21, R22 respectively.Connect through resistance R 13 between the negative input end of operational amplifier 31 and the output terminal.Connect through resistance R 23 between the negative input end of operational amplifier 32 and the output terminal.The output terminal of operational amplifier 31 is also through capacitor C 1 ground connection.The output terminal of operational amplifier 32 is also through capacitor C 2 ground connection.The output terminal of the output terminal of operational amplifier 31 and operational amplifier 32 is respectively as the output terminal M, the N that remove DC component differential amplifier circuit 3.Among this embodiment, two operational amplifiers 31,32 are as two subtracters, the DC component Voffset of two input ends is deducted the DC voltage Vdc1 that adds and the product of a coefficient, thereby make the DC component of output terminal M, N reduce.
Fig. 9 has shown another specific embodiment of removing DC component differential amplifier circuit 3.It can be regarded as combining of two embodiment of Fig. 8 and Fig. 4, and the DC component of two input ends reduces through subtracter earlier, is removed again, and the DC component of two output terminal M, N is provided by less impressed DC voltage Vdc.Output terminal M exports the ac voltage signal with DC component, and DC component wherein is Vdc.Output terminal N exports a DC voltage Vdc.
Among each embodiment of Fig. 4～Fig. 9; The maximum amplitude sum of two output terminal M of removal DC component differential amplifier circuit 3, the DC component of N and AC compounent all is less than or equal to the MWV of process chip 4; Thereby can be input to process chip 4, as shown in Figure 3.
More than be merely the preferred embodiment of the utility model, and be not used in qualification the utility model.For a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (5)
1. the position detecting circuit of a non-isolated sine and cosine resolver is characterized in that, comprising:
A non-isolated sine and cosine resolver, a shared ground between its input end and the output terminal; Four output terminals of said non-isolated sine and cosine resolver all have DC component voltage;
Remove the DC component differential amplifier circuit for two, connect two pairs of output terminals of said non-isolated sine and cosine resolver respectively.
2. the position detecting circuit of non-isolated sine and cosine resolver according to claim 1; It is characterized in that; Said removal DC component differential amplifier circuit comprises the operational amplifier of a both-end input, single-ended output at least; The pair of output of said non-isolated sine and cosine resolver connects the positive and negative input end of this operational amplifier respectively; The positive input terminal of this operational amplifier has a DC input voitage, and this DC input voitage is less than the DC component voltage of the output terminal of said non-isolated sine and cosine resolver, and the DC component of the output terminal of this operational amplifier is the DC input voitage of the positive input terminal of said operational amplifier.
3. the position detecting circuit of non-isolated sine and cosine resolver according to claim 2; It is characterized in that; Said removal DC component differential amplifier circuit (3) comprises the operational amplifier (31) of a both-end input, single-ended output, and the pair of output of non-isolated sine and cosine resolver (2) (sin+, sin-) or (cos+, cos-) are connected respectively to the positive and negative input end of operational amplifier (31); DC voltage (Vdc) is connected to the positive input terminal of operational amplifier (31); Has feedback between the negative input end of operational amplifier (31) and the output terminal; The output terminal of operational amplifier (31) and DC voltage (Vdc) are respectively as the output terminal (M, N) of removing DC component differential amplifier circuit (3); The DC component of two output terminals (M, N) output is provided by the DC voltage (Vdc) of new introducing.
4. the position detecting circuit of non-isolated sine and cosine resolver according to claim 1; It is characterized in that; Said removal DC component differential amplifier circuit comprises the operational amplifier of two both-end inputs, single-ended output at least; The pair of output of said non-isolated sine and cosine resolver connects the positive input terminal of these two operational amplifiers respectively, and the negative input end of these two operational amplifiers all has a DC input voitage.
5. the position detecting circuit of non-isolated sine and cosine resolver according to claim 4; It is characterized in that; Said removal DC component differential amplifier circuit (3) comprises the operational amplifier (31,32) of two both-end inputs, single-ended output, and the pair of output of non-isolated sine and cosine resolver (2) (sin+, sin-) or (cos+, cos-) are connected respectively to the positive input terminal of two operational amplifiers (31,32); DC voltage (Vdc) is connected to the negative input end of two operational amplifiers (31,32); All has feedback between the negative input end of two operational amplifiers (31,32) and the output terminal; The output terminal of two operational amplifiers (31,32) is respectively as the output terminal (M, N) of removing DC component differential amplifier circuit (3); This is removed in the DC component differential amplifier circuit (3), and two operational amplifiers (31,32) are as two subtracters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120314394XU CN202195824U (en) | 2011-08-25 | 2011-08-25 | Position detection circuit for non-isolation type sine and cosine rotating transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120314394XU CN202195824U (en) | 2011-08-25 | 2011-08-25 | Position detection circuit for non-isolation type sine and cosine rotating transformer |
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| Publication Number | Publication Date |
|---|---|
| CN202195824U true CN202195824U (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120314394XU Withdrawn - After Issue CN202195824U (en) | 2011-08-25 | 2011-08-25 | Position detection circuit for non-isolation type sine and cosine rotating transformer |
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| CN (1) | CN202195824U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393215A (en) * | 2011-08-25 | 2012-03-28 | 联合汽车电子有限公司 | Position detection circuit of non-isolation sine and cosine resolver |
| CN103018656A (en) * | 2012-12-04 | 2013-04-03 | 联合汽车电子有限公司 | Function test system for angle detection circuit of rotary transformer |
-
2011
- 2011-08-25 CN CN201120314394XU patent/CN202195824U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393215A (en) * | 2011-08-25 | 2012-03-28 | 联合汽车电子有限公司 | Position detection circuit of non-isolation sine and cosine resolver |
| CN103018656A (en) * | 2012-12-04 | 2013-04-03 | 联合汽车电子有限公司 | Function test system for angle detection circuit of rotary transformer |
| CN103018656B (en) * | 2012-12-04 | 2016-03-02 | 联合汽车电子有限公司 | Function test system for angle detection circuit of rotary transformer |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120418 Effective date of abandoning: 20140326 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120418 Effective date of abandoning: 20140326 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |