CN102538832A - Digital-shaft angle signal converting method - Google Patents
Digital-shaft angle signal converting method Download PDFInfo
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- CN102538832A CN102538832A CN2011104380059A CN201110438005A CN102538832A CN 102538832 A CN102538832 A CN 102538832A CN 2011104380059 A CN2011104380059 A CN 2011104380059A CN 201110438005 A CN201110438005 A CN 201110438005A CN 102538832 A CN102538832 A CN 102538832A
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Abstract
The invention provides a digital-shaft angle signal converting method. The method is characterized in that: a circuit realizing the method comprises a digital-sine and cosine signal converting circuit, an electronic wide-frequency and wide-voltage SCOTT transformer and a digital signal processor (DSP), wherein the digital-sine and cosine signal converting circuit consists of a subdivision circuit and a rough division circuit; the subdivision circuit is a resistance network digital/analogue (D/A) conversion circuit which is less than 16 bits; the rough division circuit consists of a precise resistance network, a precise operational amplifier and an analogue switch; and the electronic wide-frequency and wide-voltage SCOTT transformer consists of a mode operational circuit, a voltage amplitude value operational circuit and a power driving circuit. Full electronic technology is adopted by the digital-shaft angle signal converting method; a wide-frequency and wide-voltage differential synchro signal or rotary transformer signal can be output; the conversion precision is high; and the expandability is high.
Description
Technical field
The present invention belongs to signal imitation and technical field of measurement and test, particularly a kind of numeral-shaft angle signal conversion method.
Background technology
Common shaft angle signal has selsyn signal and signals of rotating transformer; Numeral-resolver-to-angle converter becomes selsyn signal or signals of rotating transformer with the digital angle conversion of signals exactly; Be the core devices in the modern shaft angle electronics converter technique, be widely used in space flight, aviation, radar, fire control and industrial automation field.Existing numeral-resolver-to-angle converter can only be realized the conversion of a kind of signal type, a kind of signal voltage and a kind of signal frequency, function singleness; Though the shaft angle simulator can realize that frequency, voltage and signal type are able to programme, can only reach 16 bit resolutions and 14 precision, the product price ratio is low, and bad adaptability is unfavorable for applying of measurement of angle and control field.
Summary of the invention
Technical matters to be solved by this invention is the deficiency to prior art; Propose a kind of numeral-shaft angle signal conversion method, this method adopts the full-electronic technology, can realize the selsyn signal or the signals of rotating transformer output of the wide pressure of wideband; And conversion accuracy is high, and extensibility is strong.
Technical matters to be solved by this invention is to realize through following technical scheme.The present invention is a kind of numeral-shaft angle signal conversion method, is characterized in, realizes that the circuit of this method comprises numeral-cosine and sine signal change-over circuit, the wide pressure of electronic type wideband SCOTT transformer and DSP digital signal processor;
Numeral-cosine and sine signal change-over circuit is made up of sub-circuit and rough segmentation circuit; Sub-circuit is low 16 weighted resistance network D/A change-over circuits, and the rough segmentation circuit is made up of precision resistance network, accurate amplifier and analog switch; The wide pressure of electronic type wideband SCOTT transformer is made up of pattern computing circuit, voltage magnitude computing circuit and power driving circuit;
Numeral-cosine and sine signal change-over circuit receives the 20 bit digital angle θ that outside excited signal and the DSP digital signal processor of importing through the current mode transformer isolation sends; Produce cosine and sine signal; Send to the pattern computing circuit through the current mode isolating transformer; The pattern computing circuit carries out signal type and selects according to the control command control front end input relay through electromagnetic isolation that the DSP digital signal processor sends, and exports four line signals of rotating transformer or three-way selsyn signal and gives the voltage magnitude computing circuit; The amplitude control command that the voltage magnitude computing circuit sends according to the DSP digital signal processor through electromagnetic isolation; The shaft angle signal of output respective magnitudes, power driving circuit is exported shaft angle signal according to the control command through electromagnetic isolation that the DSP digital signal processor sends, and selects the power amplification circuit of relevant voltage section to carry out power, amplitude amplification; The output shaft angle signal is realized numeral-shaft angle conversion.
In above-described numeral-shaft angle signal conversion method technical scheme: described numeral-cosine and sine signal conversion accuracy is realized by hardware precision resistance network; Numeral-cosine and sine signal change-over circuit is realized by high 4 rough segmentation weighted resistance networks and low 16 segmentation weighted resistance networks; Weighted resistance network all adopts the low temperature drift precision resistance network architecture, high 4 rough segmentation angles and low 16 segmentation angles according to trigonometric function just, two jiaos of cosine and synthesize 20 full angles with difference word expression formula; Realize the 2V low pressure cosine and sine signal output of 0.001 ° of precision.
In above-described numeral-shaft angle signal conversion method technical scheme: described pattern computing circuit preferably is made up of precision resistance, precision operational-amplifier and front end input relay; Receive fixing two-way cosine and sine signal:
; Different according to output mode signal, switch corresponding circuits; Export to the voltage magnitude computing circuit after when four line signals of rotating transformer are exported, SGND, cos θ, sin θ and CGND signal being amplified; When the output of three-way selsyn signal, with SGND ,-export to the voltage magnitude computing circuit after sin (θ+240 °) and the amplification of sin θ signal.
In above-described numeral-shaft angle signal conversion method technical scheme: described voltage magnitude computing circuit preferably is made up of linear DAC of high precision and precision operational-amplifier; Receive four line signals of rotating transformer SGND, cos θ, sin θ and CGND or three-way selsyn signal SGND ,-sin (θ+240 °) and sin θ; Different according to the output signal voltage amplitude, four line signals of rotating transformer or the three-way selsyn signal of output 0.388V-7V.
In the conversion method of the present invention: numeral-cosine and sine signal change-over circuit is accepted the excited signal through the current mode transformer isolation of 20 bit digital angles and outside input, converts the cosine and sine signal of 2V into; Realize 0.0003 ° resolution and 0.001 ° precision.Mathematical model does
Sin(α＋β)=
Cos(α＋β)=
(α is high 4 rough segmentations numeral angle, and β is low 16 digital angles of segmentation).
For realizing precision index, during circuit design simulating signal and digital signal electric power system are separated, wherein be-4V to simulation system that positive supply is+5V that negative supply is-13V; Be to digital display circuit outside input ground, power supply is+5V.
In the conversion method of the present invention: the pattern computing circuit can be realized output of four line signals of rotating transformer or the output of three-way selsyn signal by DSP DSP CONTROL transfer relay; The pattern computing circuit receives the cosine and sine signal that two-way is isolated:
,, four line signals of rotating transformer only need when exporting exporting to the voltage magnitude computing circuit after the signal amplification.When the output of three-way selsyn signal, the cosine and sine signal that two-way is isolated altogether, through produce after the arithmetical operation SGND ,-export to the voltage magnitude computing circuit after sin (θ+240 °) and sin θ and the amplification.
In the conversion method of the present invention: the DSP digital signal processor is according to required shaft angle signal voltage magnitude; Send the amplitude control word of isolating and give 16 bit linear DAC; According to voltage magnitude place segment; Send the control word of isolating and switch low-voltage, high-current power driving circuit or high-voltage power driving circuit, realize the output of 5V to 90V signal voltage to relay.Current mode transformer secondary output loop amplifier has inhibiting effect to low-frequency interference signal.And low frequency signal is produced big phase shift.When the frequency of carrier signal when 400Hz-5000Hz changes, total system can produce maximum error and adds up with the increase of frequency at 45 ° or symmetric points.The dsp software algorithm compensation is primarily aimed at sine and cosine gain that the current mode transformer sends and does not match and carry out frequency-accuracy compensation; Penalty function is
; Through above measure, realize the shaft angle signal output of the wide pressure of wideband.
Compared with prior art, numeral of the present invention-shaft angle signal conversion method adopts the full-electronic technology, can realize the selsyn signal or the signals of rotating transformer output of the wide pressure of wideband, and conversion accuracy is high, and extensibility is strong.
Description of drawings
Fig. 1 is the theory diagram of the present invention's technology;
Fig. 2 is low 16 sub-circuit block diagrams of numeral-cosine and sine signal change-over circuit;
Fig. 3 is high 4 rough segmentation circuit diagrams of numeral-cosine and sine signal change-over circuit;
Fig. 4 is pattern computing circuit figure;
Fig. 5 is voltage magnitude computing circuit figure.
Embodiment
Following with reference to accompanying drawing, further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not constitute restriction to its right.
Case study on implementation 1, with reference to Fig. 1-4, a kind of numeral-shaft angle signal conversion method realizes that the circuit of this method comprises numeral-cosine and sine signal change-over circuit, the wide pressure of electronic type wideband SCOTT transformer and DSP digital signal processor;
Numeral-cosine and sine signal change-over circuit is made up of sub-circuit and rough segmentation circuit; Sub-circuit is low 16 weighted resistance network D/A change-over circuits, and the rough segmentation circuit is made up of precision resistance network, accurate amplifier and analog switch; The wide pressure of electronic type wideband SCOTT transformer is made up of pattern computing circuit, voltage magnitude computing circuit and power driving circuit;
Numeral-cosine and sine signal change-over circuit receives the 20 bit digital angle θ that outside excited signal and the DSP digital signal processor of importing through the current mode transformer isolation sends; Produce cosine and sine signal; Send to the pattern computing circuit through the current mode isolating transformer; The pattern computing circuit carries out signal type and selects according to the control command control front end input relay through electromagnetic isolation that the DSP digital signal processor sends, and exports four line signals of rotating transformer or three-way selsyn signal and gives the voltage magnitude computing circuit; The amplitude control command that the voltage magnitude computing circuit sends according to the DSP digital signal processor through electromagnetic isolation; The shaft angle signal of output respective magnitudes, power driving circuit is exported shaft angle signal according to the control command through electromagnetic isolation that the DSP digital signal processor sends, and selects the power amplification circuit of relevant voltage section to carry out power, amplitude amplification; The output shaft angle signal is realized the conversion of numeral to shaft angle.
Embodiment 2; In embodiment 1 described numeral-shaft angle signal conversion method: numeral-cosine and sine signal change-over circuit is realized by high 4 rough segmentation weighted resistance networks and low 16 segmentation weighted resistance networks; Weighted resistance network all adopts the low temperature drift precision resistance network architecture, high 4 rough segmentation angles and low 16 segmentation angles according to trigonometric function just, two jiaos of cosine and synthesize 20 full angles with difference word expression formula; Realize the 2V low pressure cosine and sine signal output of 0.001 ° of precision.
Embodiment 3; In embodiment 1 described numeral-shaft angle signal conversion method: described pattern computing circuit is made up of precision resistance, precision operational-amplifier and front end input relay; Receive fixing two-way cosine and sine signal:
; Different according to output mode signal, switch corresponding circuits; Export to the voltage magnitude computing circuit after when four line signals of rotating transformer are exported, SGND, cos θ, sin θ and CGND signal being amplified; When the output of three-way selsyn signal, with SGND ,-export to the voltage magnitude computing circuit after sin (θ+240 °) and the amplification of sin θ signal.
Embodiment 4; In embodiment 1 described numeral-shaft angle signal conversion method: described voltage magnitude computing circuit is made up of linear DAC of high precision and precision operational-amplifier; Receive four line signals of rotating transformer SGND, cos θ, sin θ and CGND or three-way selsyn signal SGND ,-sin (θ+240 °) and sin θ; Different according to the output signal voltage amplitude, four line signals of rotating transformer or the three-way selsyn signal of output 0.388V-7V.
Embodiment 5; With reference to Fig. 1-4; A kind of numeral-shaft angle signal conversion method, 20 bit digital-sine and cosine change-over circuit receive the 20 bit digital angles that outside excited signal and the DSP through the current mode transformer isolation that imports sends, and produce the cosine and sine signal of 2V normal voltage; After the current mode transformer isolation, send to the pattern computing circuit; The controlled quentity controlled variable that the pattern computing circuit sends according to DSP through electromagnetic isolation; Produce the four line signals of rotating transformer or the three-way selsyn signal of 7V normal voltage, this signal produces the standard axle angle signal with certain power behind voltage magnitude computing circuit and power driving circuit.
Exportable four line signals of rotating transformer of pattern computing circuit or three-way selsyn signal; When the rotary transformer pattern is exported,
; Sin θ that directly will isolate each other and SGND, cos θ and CGND export to the voltage magnitude computing circuit; When the selsyn pattern is exported,
; Sin θ and-sin (θ+240 °) are exported to the voltage magnitude computing circuit, and, export to the voltage magnitude computing circuit two SGND and CGND short circuits isolator.
The voltage magnitude computing circuit is made up of high precision 16 bit linear DAC and precision operational-amplifier; The 7V shaft angle signal of receiving mode computing circuit output; The control command decision that output voltage is sent by DSP through electromagnetic isolation; Corresponding output-the 7V of 90V, 5V corresponding output-0.388V give power driving circuit, and power driving circuit is amplified to this signal the shaft angle signal of final required amplitude and power again.
Reach the protection to DSP and signaling conversion circuit based on shaft angle signal self character (sine and cosine is isolated each other during rotary transformer), the shaft angle signal of output needs to isolate.Among the present invention, digital signal is isolated employing magnetic isolating chip IL715-3 and is realized that isolate with the light idol and compare, this chip need not peripheral circuit, slewing rate fast (be 2ns time delay, and light is 2 μ s by chance).Simulating signal adopts the current mode transformer isolation, and precision is by the precision resistance matching decision of two-way transformer.The transformer secondary output loop amplifier produces big phase shift to low frequency signal, and low frequency signal is had inhibiting effect.
Claims (4)
1. numeral-shaft angle signal conversion method is characterized in that, realizes that the circuit of this method comprises numeral-cosine and sine signal change-over circuit, the wide pressure of electronic type wideband SCOTT transformer and DSP digital signal processor;
Numeral-cosine and sine signal change-over circuit is made up of sub-circuit and rough segmentation circuit; Sub-circuit is low 16 weighted resistance network D/A change-over circuits, and the rough segmentation circuit is made up of precision resistance network, accurate amplifier and analog switch; The wide pressure of electronic type wideband SCOTT transformer is made up of pattern computing circuit, voltage magnitude computing circuit and power driving circuit;
Numeral-cosine and sine signal change-over circuit receives the 20 bit digital angle θ that outside excited signal and the DSP digital signal processor of importing through the current mode transformer isolation sends; Produce cosine and sine signal; Send to the pattern computing circuit through the current mode isolating transformer; The pattern computing circuit carries out signal type and selects according to the control command control front end input relay through electromagnetic isolation that the DSP digital signal processor sends, and exports four line signals of rotating transformer or three-way selsyn signal and gives the voltage magnitude computing circuit; The amplitude control command that the voltage magnitude computing circuit sends according to the DSP digital signal processor through electromagnetic isolation; The shaft angle signal of output respective magnitudes, power driving circuit is exported shaft angle signal according to the control command through electromagnetic isolation that the DSP digital signal processor sends, and selects the power amplification circuit of relevant voltage section to carry out power, amplitude amplification; The output shaft angle signal is realized the conversion of numeral to shaft angle.
2. numeral according to claim 1-shaft angle signal conversion method; It is characterized in that: numeral-cosine and sine signal change-over circuit is realized by high 4 rough segmentation weighted resistance networks and low 16 segmentation weighted resistance networks; Weighted resistance network all adopts the low temperature drift precision resistance network architecture, high 4 rough segmentation angles and low 16 segmentation angles according to trigonometric function just, two jiaos of cosine and synthesize 20 full angles with difference word expression formula; Realize the 2V low pressure cosine and sine signal output of 0.001 ° of precision.
3. numeral according to claim 1-shaft angle signal conversion method; It is characterized in that; Described pattern computing circuit is made up of precision resistance, precision operational-amplifier and front end input relay; Receive fixing two-way cosine and sine signal:
; Different according to output mode signal, switch corresponding circuits; Export to the voltage magnitude computing circuit after when four line signals of rotating transformer are exported, SGND, cos θ, sin θ and CGND signal being amplified; When the output of three-way selsyn signal, with SGND ,-export to the voltage magnitude computing circuit after sin (θ+240 °) and the amplification of sin θ signal.
4. numeral according to claim 1-shaft angle signal conversion method; It is characterized in that; Described voltage magnitude computing circuit is made up of linear DAC of high precision and precision operational-amplifier; Receive four line signals of rotating transformer SGND, cos θ, sin θ and CGND or three-way selsyn signal SGND ,-sin (θ+240 °) and sin θ, different according to the output signal voltage amplitude, four line signals of rotating transformer or the three-way selsyn signal of output 0.388V-7V.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102879021A (en) * | 2012-09-24 | 2013-01-16 | 重庆华渝电气仪表总厂 | Rotary transformer angle code converting method and converter |
| CN103336459A (en) * | 2013-05-08 | 2013-10-02 | 安徽师范大学 | Digital converter conversion program of synchro / rotary transformer |
| CN103795416A (en) * | 2014-02-27 | 2014-05-14 | 连云港杰瑞电子有限公司 | High-precision digital to resolving convertor |
| CN105180973A (en) * | 2015-10-15 | 2015-12-23 | 连云港杰瑞电子有限公司 | Single-chip digital-rotary transformer signal conversion method |
| CN107666321A (en) * | 2017-10-17 | 2018-02-06 | 中国电子科技集团公司第四十三研究所 | D/R converter parallel binary angle code two-way orthogonal signalling conversion equipments |
| CN110849258A (en) * | 2019-11-28 | 2020-02-28 | 武汉华之洋科技有限公司 | Angle encoder based on induction synchronizer |
| CN112284427A (en) * | 2020-10-29 | 2021-01-29 | 中国航空工业集团公司洛阳电光设备研究所 | Method for high-speed conversion of angle signals of rotary transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879021A (en) * | 2012-09-24 | 2013-01-16 | 重庆华渝电气仪表总厂 | Rotary transformer angle code converting method and converter |
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| CN103795416A (en) * | 2014-02-27 | 2014-05-14 | 连云港杰瑞电子有限公司 | High-precision digital to resolving convertor |
| CN103795416B (en) * | 2014-02-27 | 2017-01-11 | 连云港杰瑞电子有限公司 | High-precision digital to resolving convertor |
| CN105180973A (en) * | 2015-10-15 | 2015-12-23 | 连云港杰瑞电子有限公司 | Single-chip digital-rotary transformer signal conversion method |
| CN107666321A (en) * | 2017-10-17 | 2018-02-06 | 中国电子科技集团公司第四十三研究所 | D/R converter parallel binary angle code two-way orthogonal signalling conversion equipments |
| CN107666321B (en) * | 2017-10-17 | 2023-10-24 | 中国电子科技集团公司第四十三研究所 | Parallel binary angle code-two-path orthogonal signal conversion device of D/R converter |
| CN110849258A (en) * | 2019-11-28 | 2020-02-28 | 武汉华之洋科技有限公司 | Angle encoder based on induction synchronizer |
| CN110849258B (en) * | 2019-11-28 | 2021-04-06 | 武汉华之洋科技有限公司 | Angle encoder based on induction synchronizer |
| CN112284427A (en) * | 2020-10-29 | 2021-01-29 | 中国航空工业集团公司洛阳电光设备研究所 | Method for high-speed conversion of angle signals of rotary transformer |
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