CN101789757B - Digital conversion method of differential synchro/rotary transformer signal of singlechip - Google Patents
Digital conversion method of differential synchro/rotary transformer signal of singlechip Download PDFInfo
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Abstract
The invention discloses a digital conversion method of a differential synchro/rotary transformer signal of a singlechip. The digital conversion method is characterized in that a signal of the differential synchro/rotary transformer is digitally processed and converted into a binary digital angle; a circuit of the differential synchro/rotary transformer consists of a trimming solid state control transformer circuit, an alternating current error amplifying circuit, a high pass filter path, a phase-sensibility demodulation circuit, a two-order integral circuit, a voltage-controlled oscillating circuit, a counting circuit and a level shift circuit; the circuits are integrated on the single chip by adopting a high-pressure BiMOS (Bipolar Metal Oxide Semiconductor) process; and a power supply of the whole circuit is -12V-+12V. A laser trimming method of a film resistor is used in the trimming solid state control transformer circuit, so that the resistance matching precision is improved and therebythe conversion precision is improved; and a signal filter method is used in a rear stage of the alternating current error amplifying circuit, so that low-frequency noise and the direct current error can be filtered and the conversion precision can be improved. The circuit has favorable performance and the input-output amplitude of the signal is increased.
Description
The method field
The invention belongs to integrated circuit fields, particularly relate to a kind of digital conversion method of autosyn/rotary transformer signal of single-chip.
Background method
In autosyn/rotary transformer-digital translation integrated circuit fields, usually use the low-voltage ic based on CMOS technique, being single power supply CMOS integrated circuit autosyn/rotary transformer-digital integrated circuit switch technology, is 200810013440.3 Chinese patent application such as application number.Its voltage only has ± 5V, and the amplitude of input signal is less, and solid-state control transformer uses switching capacity, and not overriding, conversion accuracy is generally 4LSB～7LSB, and circuit structure is comparatively complicated, less stable, and the output data function is single.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, and a kind of high accuracy, high voltage, multi-functional autosyn/rotary transformer-digital integrated circuit conversion method are provided.
Technical problem to be solved by this invention is to realize by following technical scheme.The present invention is a kind of digital conversion method of autosyn/rotary transformer signal of single-chip, be characterized in: it carries out digitized processing to selsyn signal/signals of rotating transformer, and selsyn signal/signals of rotating transformer is converted to the binary digit angle; Its circuit is comprised of overriding solid-state control transformer circuit, interchange error amplifying circuit, high-pass filtering circuit, phase-sensitive demodulating circuits, Second Order Integral circuit, Voltage-Controlled oscillation circuit, counting circuit and level shifting circuit; And adopt high pressure BiMOS technique that foregoing circuit is integrated on the one single chip; The power supply of whole circuit is-12V～+ 12V;
Overriding solid-state control transformer circuit is comprised of R-2RDAC and 6 set of segmentation ratio circuits (being respectively 180 °, 90 °, 45 °, 22.5 °, 11.25 °, 5.625 ° segmentation scales circuit), and every set of segmentation ratio circuit forms by operational amplifier and dividing potential drop film resistor; Arrange by the segmentation scales circuit of the several circuit of putting of level shifting circuit to overriding solid-state control transformer circuit, the switch of control segmentation scales circuit, make the simulation angle θ of autosyn/rotary transformer only through selected segmentation scales circuit output, and output error signal Ksin after being changed by R-2RDAC again (θ-φ); Overriding solid-state control transformer circuit adopts film resistor laser trimming method, dividing potential drop film resistor in the overriding solid-state control transformer circuit is trimmed, make dividing potential drop film resistor relative accuracy reach ten thousand/, (θ-φ) is 0 to make output error signal Ksin, make conversion accuracy reach 1LSB～2LSB, namely 0.0055 °～0.011 °;
Described level shifting circuit is produced circuit, step-down latch, step-up transformer and is put several the electric circuit constitutes by Voltage Reference; The step-down latch is comprised of high-low level selector, voltage-selected switch and latch, and step-up transformer is comprised of high-low level selector and voltage-selected switch; The high level of counting circuit output be+and 12V, low level select signal for the digital angle of-12V by the high-low level selector output voltage of step-down latch, and export at the digital angle that be converted to high level by voltage-selected switch, latch again to be+5V, low level is 0V; Counting circuit is when putting number state, outside high level is that signal is selected by the high-low level selector output voltage of step-up transformer in the digital angle of 0V for+5V, low level, is converted to high level by voltage-selected switch again and is+12V, the low level digital angle input counting circuit for-12V; Voltage Reference produces circuit provides 5V, 5.4V and 10.8V for step-down latch and step-up transformer reference voltage; Put several circuit overriding solid-state control transformer circuit is put number;
Simulation angle θ in overriding solid-state control transformer circuit after exchanging error amplifying circuit output error signal Ksin (θ-φ), producing digital angle φ through high-pass filtering circuit filtering, phase-sensitive demodulating circuits, Second Order Integral circuit, Voltage-Controlled oscillation circuit and counting circuit successively, last digital angle φ in overriding solid-state control transformer circuit with a closed loop relatively forming of simulation angle θ, seek the sin (zero point of θ-φ); When this process was finished, digital angle φ equaled to simulate angle θ; Export digital angle φ finally by level shifting circuit; Wherein: K is no-load voltage ratio.
Technical problem to be solved by this invention can also further realize by following technical scheme.The digital conversion method of the autosyn/rotary transformer signal of above-described single-chip is characterized in: described high-pass filtering circuit adopts the passive high-pass filtering circuit of Order RC.To carrying out filtering by the error signal of overriding solid-state control transformer output, direct current and low-frequency noise signal that filtering circuit produces further improve conversion accuracy by the passive high-pass filtering circuit of Order RC.
Technical problem to be solved by this invention can also further realize by following technical scheme.The digital conversion method of the autosyn/rotary transformer signal of above-described single-chip is characterized in: described level shifting circuit also is provided with output byte selection and complement code control; Output byte is selected that the output data are carried out byte and is selected, and complement code control is carried out supplement to the input data.
Below the inventive method is further detailed.
1.1 dividing potential drop film resistor laser trimming method in the overriding solid-state control transformer circuit
Overriding solid-state control transformer circuit adopts high 6 segment circuits and low 10 sub-circuits, high 6 segment circuits decompose 0 °-5.625 ° with 0 °-360 ° of angle variable quantities, low 10 sub-circuits adopt the D/A converter of R-2R resistance, consist of an analog multiplier, realize that the interior simulation angle of 0 ° of-5.625 ° of scope is to the conversion at digital angle.
Adopt overriding dividing potential drop film resistor network method alternative switch capacitance network method in the overriding solid-state control transformer circuit, realize high-precision simulation angle to the conversion at digital angle in BiMOS technique, the conversion accuracy of the inventive method can reach at 1～2LSB.
The digital angle φ identical by the reference signal source input enters the change-over circuit of the inventive method with simulation angle θ.Simulation angle θ carries out the dividing potential drop conversion by rough segmentation circuit and the sub-circuit of overriding solid-state control transformer circuit.Numeral angle φ enters segmentation and puts several circuit, controls respectively rough segmentation control signal and segmentation control signal.180 °, 90 °, 45 °, 22.5 °, 11.25 °, 5.625 ° rough segmentation control signal is controlled 180 °, 90 °, 45 °, 22.5 °, 11.25 °, 5.625 ° totally 6 set of segmentation ratio circuits in overriding solid-state control transformer circuit, it is opened by putting several circuit datas, angle θ be will simulate and sin (level signal of θ-n*5.625) and sin (θ-(n-1) * 5.625) (wherein n=[θ/5.625] ([] is for rounding symbol)), input segmentation R-2RDAC circuit will be converted to.The error voltage of output is digital angle φ and the output error signal sin of simulation angle θ (θ-φ) at last.
When trimming, trim successively 6 set of segmentation ratio circuits (being respectively 5.625 °, 11.25 °, 22.5 °, 45 °, 90 °, 180 ° segmentation scales circuit), first 5.625 ° of segmentation scales circuit are trimmed, arrange by the segmentation scales circuit of the several circuit of putting of level shifting circuit to overriding solid-state control transformer circuit, make signal sin θ, 5.625 ° of segmentation scales circuit of access between the cos θ, trim procedural test error voltage value, when when signal is the 2V effective voltage, error signal sin (value of θ-φ) less than
When (error voltage of 1LSB), finish a set of segmentation ratio circuit and trim.Then next group is trimmed, and by that analogy.Its structure as shown in Figure 2.Wherein the ratio of each resistance is:
R1∶R2＝1；
R3∶R4＝1/COS45°-1＝0.41421；
R5∶R6＝1/COS22.5°-1＝0.08239；
R7∶R8＝1/COS11.25°-1＝0.01959；
R9∶R10＝1/COS5.625°-1＝0.00483。
In the shaft angle conversion, 45 ° precision is for the most not good enough, so we are take 45 ° as the example computational accuracy.As scheme institute 3 and show that wherein R1, R2, R3, R4 are dividing potential drop film resistor to be trimmed.Its error is X%, and the final error of signal is:
To 16 precision, its error is 7 codes (namely 0.11 °), namely is accurate at least 13, and its value is 0.043, to the precision of its calculated resistance is:
(SIN (45 °+0.011 °)-SIN45 °)/SIN45 °=0.075% namely has
So, X=0.047%
To 16 precision, its error is 1 code, namely is accurate at least 16 (namely 0.0055 °), and the precision of its calculated resistance will reach 0.006%.
Therefore, to 16 precision, matching precision was 0.047% when the dividing potential drop film resistor of coupling was 5/10000ths, 7LSB required precision resistance, and is substantially satisfied, and the dividing potential drop film resistor after trimming is 0.006%, the 1LSB that precision can reach.
1.2 the passive high-pass filtering method of Order RC
Use the passive high-pass filtering circuit of Order RC that the error signal of overriding solid-state control transformer circuit output is carried out filtering, its turn-on frequency is
Can eliminate the effects of the act inner dc error and low-frequency noise, thereby the conversion accuracy of providing.
1.3 high voltage autosyn/rotary transformer-digital conversion circuit method
The present invention uses the BiMOS technique of high pressure, and the structure of BiMOS circuit is more simple and reliable, so that the stability of the circuit of the inventive method and precision are better than CMOS technique circuit far away.High tension voltage has a better applicability so that applied signal voltage scope output speed voltage range is larger.
1.4 level shifting circuit
It is 0～5V for the normal voltage of general signal, and the power supply of the circuit of the inventive method is-and 12V～+ 12V.As shown in Figure 4, realize by level shifting circuit inner-12V～+ the 12V data-signal realizes mutually conversion with outside normal voltage 0～5V.
Compared with prior art, the inventive method adopts high pressure BiMOS technique to realize autosyn/rotary transformer-digital conversion method.The device performance of high pressure BiMOS is better than cmos device, and in the situation that realizes same performance, the structure of BiMOS circuit is more simple, reliable, so that the temperature applicable range of change-over circuit, stability and precision are better than CMOS technique circuit far away.And high voltage is so that applied signal voltage scope, output speed voltage range are larger.
Description of drawings
Fig. 1 is the circuit block diagram of the inventive method.
Fig. 2 is the structure chart that trims solid-state control transformer circuit.
Fig. 3 is 45 ° of segmentation scales circuit diagrams.
Fig. 4 is the level shifting circuit block diagram.
Embodiment
Below further describe concrete grammar scheme of the present invention, so that the method personnel of this area understand the present invention further, and do not consist of its Copyright law.
Embodiment 1.With reference to Fig. 1-4.A kind of digital conversion method of autosyn/rotary transformer signal of single-chip, it carries out digitized processing to selsyn signal/signals of rotating transformer, and selsyn signal/signals of rotating transformer is converted to the binary digit angle; Its circuit is comprised of overriding solid-state control transformer circuit, interchange error amplifying circuit, high-pass filtering circuit, phase-sensitive demodulating circuits, Second Order Integral circuit, Voltage-Controlled oscillation circuit, counting circuit and level shifting circuit; And adopt high pressure BiMOS technique that foregoing circuit is integrated on the one single chip; The power supply of whole circuit is-12V～+ 12V;
Overriding solid-state control transformer circuit is comprised of R-2RDAC and 6 set of segmentation ratio circuits, and every set of segmentation ratio circuit forms by operational amplifier and dividing potential drop film resistor; Arrange by the segmentation scales circuit of the several circuit of putting of level shifting circuit to overriding solid-state control transformer circuit, the switch of control segmentation scales circuit, make the simulation angle θ of autosyn/rotary transformer only through selected segmentation scales circuit output, and output error signal Ksin after being changed by R-2RDAC again (θ-φ); Overriding solid-state control transformer circuit adopts film resistor laser trimming method, dividing potential drop film resistor in the overriding solid-state control transformer circuit is trimmed, make dividing potential drop film resistor relative accuracy reach ten thousand/, (θ-φ) is 0 to make output error signal Ksin, make conversion accuracy reach 1LSB～2LSB, namely 0.0055 °～0.011 °;
Described level shifting circuit is produced circuit, step-down latch, step-up transformer and is put several the electric circuit constitutes by Voltage Reference; The step-down latch is comprised of high-low level selector, voltage-selected switch and latch, and step-up transformer is comprised of high-low level selector and voltage-selected switch; The high level of counting circuit output be+and 12V, low level select signal for the digital angle of-12V by the high-low level selector output voltage of step-down latch, and export at the digital angle that be converted to high level by voltage-selected switch, latch again to be+5V, low level is 0V; Counting circuit is when putting number state, outside high level is that signal is selected by the high-low level selector output voltage of step-up transformer in the digital angle of 0V for+5V, low level, is converted to high level by voltage-selected switch again and is+12V, the low level digital angle input counting circuit for-12V; Voltage Reference produces circuit provides 5V, 5.4V and 10.8V for step-down latch and step-up transformer reference voltage; Put several circuit overriding solid-state control transformer circuit is put number;
Simulation angle θ in overriding solid-state control transformer circuit after exchanging error amplifying circuit output error signal Ksin (θ-φ), producing digital angle φ through high-pass filtering circuit filtering, phase-sensitive demodulating circuits, Second Order Integral circuit, Voltage-Controlled oscillation circuit and counting circuit successively, last digital angle φ in overriding solid-state control transformer circuit with a closed loop relatively forming of simulation angle θ, seek the sin (zero point of θ-φ); When this process was finished, digital angle φ equaled to simulate angle θ; Export digital angle φ finally by level shifting circuit; Wherein: K is no-load voltage ratio.
Embodiment 2.In the digital conversion method of the autosyn/rotary transformer signal of embodiment 1 described single-chip: described high-pass filtering circuit adopts the passive high-pass filtering circuit of Order RC.
Embodiment 3.In the digital conversion method of the autosyn/rotary transformer signal of embodiment 1 or 2 described single-chips: described level shifting circuit also is provided with output byte selection and complement code control; Output byte is selected that the output data are carried out byte and is selected, and complement code control is carried out supplement to the input data.Numeral angle φ is the level signal that is output as 0～5V by level shifting circuit, and can control its output byte and complement form.So chip can be selected the data of output, the most-significant byte that can export simultaneously and least-significant byte data also can be selected to export respectively to most-significant byte and least-significant byte.Show complement code, for example 10 former output data are 0,100 0,010 0011, and becoming after the complement code is 1,011 1,110 1100.Can directly add and subtract processing to signal easily.
Claims (3)
1. the digital conversion method of the autosyn/rotary transformer signal of a single-chip, it is characterized in that: it carries out digitized processing to selsyn signal/signals of rotating transformer, and selsyn signal/signals of rotating transformer is converted to the binary digit angle; Its circuit is comprised of overriding solid-state control transformer circuit, interchange error amplifying circuit, high-pass filtering circuit, phase-sensitive demodulating circuits, Second Order Integral circuit, Voltage-Controlled oscillation circuit, counting circuit and level shifting circuit; And adopt high pressure BiMOS technique that foregoing circuit is integrated on the one single chip; The power supply of whole circuit is-12V～+ 12V;
Overriding solid-state control transformer circuit is comprised of R-2RDAC and 6 set of segmentation ratio circuits, and every set of segmentation ratio circuit forms by operational amplifier and dividing potential drop film resistor; Arrange by the segmentation scales circuit of the several circuit of putting of level shifting circuit to overriding solid-state control transformer circuit, the switch of control segmentation scales circuit, make the simulation angle θ of autosyn/rotary transformer only through selected segmentation scales circuit output, and output error signal Ksin after being changed by R-2RDAC again (θ-φ); Overriding solid-state control transformer circuit adopts film resistor laser trimming method, dividing potential drop film resistor in the overriding solid-state control transformer circuit is trimmed, make dividing potential drop film resistor relative accuracy reach ten thousand/, (θ-φ) is 0 to make output error signal Ksin, make conversion accuracy reach 1LSB～2LSB, namely 0.0055 °～0.011 °;
Described level shifting circuit is produced circuit, step-down latch, step-up transformer and is put several the electric circuit constitutes by Voltage Reference; The step-down latch is comprised of high-low level selector, voltage-selected switch and latch, and step-up transformer is comprised of high-low level selector and voltage-selected switch; The high level of counting circuit output be+and 12V, low level select signal for the digital angle of-12V by the high-low level selector output voltage of step-down latch, and export at the digital angle that be converted to high level by voltage-selected switch, latch again to be+5V, low level is 0V; Counting circuit is when putting number state, outside high level is that signal is selected by the high-low level selector output voltage of step-up transformer in the digital angle of 0V for+5V, low level, is converted to high level by voltage-selected switch again and is+12V, the low level digital angle input counting circuit for-12V; Voltage Reference produces circuit provides 5V, 5.4V and 10.8V for step-down latch and step-up transformer reference voltage; Put several circuit overriding solid-state control transformer circuit is put number;
Simulation angle θ in overriding solid-state control transformer circuit after exchanging error amplifying circuit output error signal Ksin (θ-φ), producing digital angle φ through high-pass filtering circuit filtering, phase-sensitive demodulating circuits, Second Order Integral circuit, Voltage-Controlled oscillation circuit and counting circuit successively, last digital angle φ in overriding solid-state control transformer circuit with a closed loop relatively forming of simulation angle θ, seek the sin (zero point of θ-φ); When this process was finished, digital angle φ equaled to simulate angle θ; Export digital angle φ finally by level shifting circuit; Wherein: K is no-load voltage ratio.
2. the digital conversion method of the autosyn/rotary transformer signal of single-chip according to claim 1 is characterized in that: the passive high-pass filtering circuit of described high-pass filtering circuit employing Order RC.
3. the digital conversion method of the autosyn/rotary transformer signal of single-chip according to claim 1 is characterized in that: described level shifting circuit is provided with also that output byte is selected and complement code is controlled; Output byte is selected that the output data are carried out byte and is selected, and complement code control is carried out supplement to the input data.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102589584B (en) * | 2012-02-15 | 2014-09-10 | 连云港杰瑞电子有限公司 | Method for converting high-precision single-chip digital signal into shaft angle signal |
| CN102611452B (en) * | 2012-03-16 | 2015-06-17 | 中国人民解放军92854部队军械修理厂 | Digital-selsyn signal conversion method adopting alpha-beta heterodyne value algorithm |
| CN103532556B (en) * | 2013-10-28 | 2016-09-07 | 连云港杰瑞电子有限公司 | A kind of single-chip shaft angle signal is to serial digital signal change-over circuit |
| CN105180973B (en) * | 2015-10-15 | 2018-02-02 | 连云港杰瑞电子有限公司 | A kind of single-chip numeral signals of rotating transformer conversion method |
| CN106385259B (en) * | 2016-10-26 | 2019-08-09 | 连云港杰瑞电子有限公司 | A kind of single-chip internal reference axes-angle conversion circuit and method |
| CN107356268B (en) * | 2017-07-11 | 2020-07-14 | 连云港杰瑞电子有限公司 | Differential conversion method from rotary transformer to digit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000052486A1 (en) * | 1999-03-03 | 2000-09-08 | Invensys Sensor Systems Division Of Robertshaw Controls Company | Synchro/resolver bridge and automatic test system |
| CN101281041A (en) * | 2008-04-14 | 2008-10-08 | 连云港杰瑞电子有限公司 | Single power supply CMOS integrated circuit autosyn / rotary transformer - digital conversion technique |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0879082A (en) * | 1994-09-09 | 1996-03-22 | Mitsubishi Electric Corp | Synchronized digital converter |
-
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000052486A1 (en) * | 1999-03-03 | 2000-09-08 | Invensys Sensor Systems Division Of Robertshaw Controls Company | Synchro/resolver bridge and automatic test system |
| CN101281041A (en) * | 2008-04-14 | 2008-10-08 | 连云港杰瑞电子有限公司 | Single power supply CMOS integrated circuit autosyn / rotary transformer - digital conversion technique |
Non-Patent Citations (2)
| Title |
|---|
| 徐大林等.自整角机/旋转变压器―数字变换技术及发展.《测控技术》.2005,第24卷(第10期), * |
| 徐大林等.高精度自整角机/旋转变压器模拟直流转换器的设计.《微电机》.2006,第39卷(第06期), * |
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