Digital-to-synchro/resolver converter
阅读：804发布：2022-01-02
专利汇可以提供Digital-to-synchro/resolver converter专利检索，专利查询，专利分析的服务。并且A digital-data to shaft-angle converter that compensates for the non-linear relationship between a 12-bit data word theta 12, representing the desired shaft angle, and its corresponding trigonometric sine and cosine functions as represented by analog voltages. Basically the invention constructs, by empirical means and using linear voltage signals, first and second voltage segments whose amplitudes closely approximate sine and cosine functions, respectively, over the 0* - 45* range. The invention is also capable of constructing by empirical means, third and fourth signals which are mirror images of the first and second signals described above. By proper selection of two of the four possible signals described above and assigning a proper polarity thereto, all in accordance with a truth table, sine and cosine analog voltage signals are generated which can be employed to drive the synchro shaft to any desired angle angular position from 0* to 360*. Both the generation of the 0 - 45 sine and cosine voltage segments (and their mirror images) and the selecting of the proper ones of such generated voltage segments are effected by logic which is directly under the control of the data word theta 12.，下面是Digital-to-synchro/resolver converter专利的具体信息内容。
1. A digital-to-analog converter for converting a digital word theta 12, which digitally represents an angular displacement over an angular range of from 0* to 360*, to first and sEcond analog voltages e1 and e2, whose amplitudes are substantially proportional to the functions of sine theta 12 and cosine theta 12 respectively, and comprising: storage means responsive to theta 12 as the count thereof progresses through each 45* octant from 0* to 360*, to store a binary word count theta 9, the count of which begins at zero at the beginning of each odd 45* octant and increases linearly to a maximum count at the end of each odd 45* octant, and the count of which begins at a maximum count at the beginning of each even 45* octant and decreases linearly to zero at the end of each even 45* octant; a multi-stage attenuation network having an input terminal and an output terminal and constructed to have any stage or combination of stages thereof connected between said input and output terminals, in response to the contents of the binary word theta 9 supplied thereto, to produce a transconductance between said input and output terminals which varies linearly with the value of the binary word theta 9; means for supplying an input voltage VSF to said input terminal of said multi-stage attenuation network; a second attenuation means connected in series with said multistage attenuation means and constructed to modify said input voltage VSF by an attenuation factor A; said second attenuation means being responsive to theta 9 over a plurality of discrete and contiguous angular segments of each of said 45* octants to vary the value of factor A in accordance with the said specific angular segments indicated by theta 9, and with said values of A being selected to modify the output of said multi-stage attenuation means to produce a first signal E1 which alternately and contiguously approximates portions of a sine function over the 0* to 45* range and the mirror image thereof which occurs over the 135* to 180* range; a third attenuation means connected in series arrangement with said multi-stage attenuation means and said second attenuation means, and constructed to modify the signal E1 by an attenuation factor B; said third attenuation means being responsive to theta 9 over said plurality of discrete and contiguous angular segments of each 45* octant to vary the value of factor B in accordance with the specific angular segments indicated by theta 9, and with said values of B being selected to modify E1 to produce a signal E2, which, when subtracted from VSF, alternately and contiguously approximates a cosine function over the 0* to 45* range and the mirror image thereof, which occurs over the 135* to 180* range; and selecting means, including inverting means, responsive to theta 12 to select the proper forms and polarity of E1 and E2 during each octant to construct e1 and e2 for any value of theta 12.
2. A digital-to-analog converter in accordance with claim 1 comprising; reference voltage source means for providing a reference voltage Vref; fourth attenuating means constructed and connected to attenuate said reference voltage Vref by an attenuation factor SF to produce said voltage VSF; said fourth attenuation means being responsive to theta 9 over said plurality of discrete and angular segments of each of said octants to vary the value of factor SF in accordance with the specific angular segments represented by theta 9, and with the values of SF selected to modify Vref to satisfy the expression; (E1)2 + (E2)2 Congruent K for any given value of theta 9 and wheRe K is a constant.
3. A digital-to-analog converter for converting a digital word theta 12, whose value is linearly proportional to angular displacement from 0* to 360*, into sine and cosine function analog voltages e1 and e2, respectively, and comprising; first logic means responsive to theta 12 to linearly modulate an applied voltage VSF from a modulation index of 100 percent to a modulation index of 0 percent over every odd octant of 45* which is represented by theta 12, to produce an output voltage VL; first attenuation means responsive to theta 12 to attenuate predetermined and contiguous segments of each octant of VL by a factor A, where said segments for each octant are measured from the nearest quadrant markers of said 0* to 360* angular displacement, and where A varies in accordance with the particular segment being attenuated to produce an output voltage E1, which output voltage alternately approximates a sine function over a 0* - 45* range during each even octant of theta 12 and a sine function over a 135* - 180* range during each even octant of theta 12; second attenuation means responsive to theta 12 to attenuate predetermined and contiguous segments of each octant of E1 by a factor B, where said segments for each octant are measured from the nearest quadrant markers of said 0* to 360* angular displacement, and where B varies in accordance with the particular segment being attenuated to produce an output voltage BE1 which satisfies the following expression; E2 Vref - BE1 where E2 is a voltage which alternately approximates a cosine function over a 0* - 45* range during each odd octant of theta 12, and which approximates a cosine function over a 135* -180* range during each even octant of theta 12; and second logic means comprising selecting and inverting means for inverting E1 and E2 and constructed to respond to theta 12 to select the inverted or non-inverted form of E1 and E2 to construct e1 and e2 for the particular angular displacement represented by theta 12.
4. A digital-to-analog converter in accordance with claim 3 comprising; reference voltage source means for providing a reference voltage Vref; fourth attenuating means constructed and connected to attenuate said reference voltage Vref by an attenuation factor SF to produce said applied voltage VSF; said fourth attenuation means being responsive to theta 12 over said predetermined and contiguous segments of each octant to vary the value of factor SF in accordance with the specific angular segments represented by theta 12, with the values of SF selected to modify Vref to satisfy the expression; (E1)2 + (E2)2 K for any value of theta 12 and where K is a constant.
5. A digital-to-analog converter for converting a digital word theta 12, whose value is linearly proportional to angular displacement from 0* to 360* into sine and cosine function analog voltages e1 and e2, respectively and comprising; a reference voltage source Vref of constant amplitude; first logic means comprising first attenuation means and responsive to theta 12 to identify each of the eight octants of said 0* to 360* range and to linearly attenuate Vref by different and predetermined attenuation factors over predetermined and contiguous segments of each even octant to aPproximate a sine function analog voltage E43 over the 135* to 180* range; second logic means responsive to the identification of each octant by theta 12 and to E40 and E43 to linearly attenuate Vref by different and predetermined attenuation factors over predetermined and contiguous segments of each odd octant to approximate a cosine function analog voltage E41 over the 0* to 45* range, and to linearly attenuate Vref by different and predetermined attenuation factors over predetermined and contiguous segments of each even octant to approximate a cosine function analog voltage E42 over the 135* to 180* range; and third logic means comprising inverting means and constructed to respond to theta 12 to select a pair of the voltages of voltages E40, E41, E42 and E43, in accordance with the octant defined by theta 12, to approximate the sine and cosine function voltages e1 and e2 corresponding to the angular displacement represented by theta 12.
6. The method of converting a digital word theta 12, whose value is linearly proportional to angular displacement from 0* to 360*, into sine and cosine function analog voltages e1 and e2, respectively, and comprising the steps of; linearly modulating a reference voltage Vref from a modulation index of 100 percent to a modulation index of 0 percent over every odd octant of 45* represented by theta 12 and from a modulation index of 0 percent to a modulation index of 100 percent over every even octant represented by theta 12, to produce an output voltage VL; attenuating predetermined and contiguous segments of each octant of VL by a factor A, where said segments for each octant are measured from the quadrant markers of the 0* to 360* angular displacement, and where A varies in accordance with the particular segment being attenuated to produce an output voltage E1, which output voltage alternately approximates a sine function over a 0*-45* range during each even octant and which approximates a sine function over the 135* - 180* range during each odd octant; attenuating predetermined and contiguous segments of each octant of E1 by a factor B, where said segments for each octant are always measured from the quadrant markers of said 0* to 360* angular displacement, and where B varies in accordance with the particular segment being attenuated to produce an output voltage BE1 which satisfies the following expression; E2 V - BE1 where E2 is a voltage which alternately approximates a cosine function over a 0* - 45* range during each even octant, and which approximates a cosine function over the 135* - 180* range over each odd octant; forming inversions of each of said voltages E1 and E2; and selecting the proper forms of E1 and E2 during each octant of said 0* - 360* range to construct e1 and e2 for the particular angular displacement represented by theta 12.
7. The method of claim 6 comprising the further step of attenuating the applied voltage Vref to produce the following relationship between E1 and E2; (E1)2 + (E2)2 Congruent K for any angle represented by theta 12 and where K is a constant.
8. The method of converting a digital word theta 12, whose value is linearly proportional to angular displacement from 0* to 360*, into sine and cosine function analog voltages e1 and e2, respectively, and comprising the steps of; modulating an applied voltage VSF linearly from 100 percent modulation to 0 percent modulating during each odd quadrant of theta 12 over its 0* -360* range to produce an output voltage E40, and from 0 percent modulation to 100 percent modulation during each even octant of theta 12 over its 0* - 360* range to produce an output voltage E43; attenuating said linear signals E40 and E43 to approximate respectively, a sine function in the angular range of from 0* to 45* in each odd octant of theta 12, and a sine function in the angular range of from 135* to 180* in each even octant of theta 12 ; attenuating E40 to approximate the function ( 1-cosine theta 9 ) in each odd octant, where theta 9 has an angular range of from 0* to 45*, to produce a voltage E41; attenuating E43 to approximate the function (1 - cosine theta 9) in each even quadrant, where theta 9 has an angular range of from 135* to 180* to produce a voltage E42; producing an inverted form of each of voltages E40, E41, E42 and E43; and selecting and assembling the inverted and non-inverted signals E40, E41, E42 and E43 in accordance with the angular displacement represented by theta 12 to produce the sine and cosine function analog voltages e1 and e2.
9. The method of claim 8 comprising the further step of attenuating the applied voltage VSF to produce the following relationships; (E40)2 + (E41)2 Congruent K (E1)2 + (E2)2 Congruent K (E43)2 + (E42)2 Congruent K for any angle represented by theta 12 and where K is a constant.
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