CN100462686C - A Synthesizer/Resolver-Analog DC Voltage Conversion Method - Google Patents

Abstract

The analog dc voltage conversion method with synchro/resolver comprises: converting the axial angle of synchro/resolver into parallel natural binary O for output; amplifying the digital angle O with FPGA PLC to increase or decrease its output step for signal amplification or minification and output to a digital-analog dc voltage converter with a DAC, a reference power and a operational amplifier to complete the conversion. This invention has high reliability while low consumption.

Description

A kind of autosyn/rotary transformer-analog DC voltage transforming method

Technical field

The present invention relates to a kind of selsyn signal/signals of rotating transformer be carried out the voltage processing, and selsyn signal/signals of rotating transformer is directly changed into the method that instrument is controlled needed analog DC voltage signal.

Background technology

Selsyn is a kind of induction type electromechanical compo, is mainly used in automatic control, transmits and calculate in the answer system synchronously.It can be transformed to the corner of rotating shaft electric signal or electric signal is transformed to the corner of rotating shaft, realizes remote transmission, reception and the conversion of angle-data, reaches the purpose of automatic indication angle, position, distance and instruction.

Rotary transformer is the signal element that a kind of output voltage changes with angle of rotor.When field copper during with the alternating voltage excitation of certain frequency, the voltage of output winding is tied to form sine with the functional relationships of angle of rotor, cosine function concerns.It is mainly used in coordinate transform, triangulo operation and angle-data transmission.

Autosyn/rotary transformer is as shaft angle displacement measurement element, has measuring accuracy height, simple in structure, reliable, be mainly used in all very high environment of precision prescribed, reliability, compare with other angle measurement method, autosyn/rotary transformer is used for measurement of angle and has remarkable advantages.Autosyn/rotary transformer is as the axis angle measurement element, for automatic control system provides low-cost, high-precision position transducer.And in industrial detection control field, often need that selsyn signal/signals of rotating transformer is converted to analog DC voltage and directly carry out the instrument Detection ﹠ Controling.

At present, autosyn/rotary transformer-data-converting block is adopted in autosyn/rotary transformer-DC voltage conversion, D/A converter, reference power supply and amplifier are realized, by autosyn/rotary transformer-data-converting block shaft angle signal is transformed into the digital angle amount, pass through D/A converter, reference power supply and amplifier, it is the d. c. voltage signal of mould that digital angle signal is transformed into the reference power supply, the d. c. voltage signal that this mode realizes, system adopts split-type structural, need to use a large amount of resolution elements inevitably, often have following three defectives:

1, precision is low, during the D/A conversion, by analogue amplifier signal and error is together amplified, and output voltage error is bigger, simultaneously, adopts resolution element, and it is big disturbed by outer signals, the outside reference poor stability, and the output voltage precision is not high.

2, volume is big, and element distributes and relatively disperses, and can not realize the system element high-density installation, and volume ratio is bigger.

3, poor reliability has been used a large amount of resolution elements, and integrated level is low, has reduced the reliability of system.

Summary of the invention

Technical matters to be solved by this invention is at the deficiencies in the prior art, and a kind of autosyn/rotary transformer-analog DC voltage transforming method is provided, and it can overcome above-mentioned defective, and the analog DC voltage of output is directly proportional with the angle of input.

Technical matters to be solved by this invention is to realize by following technical scheme.The present invention is a kind of autosyn/rotary transformer-analog DC voltage transforming method, is characterized in, selsyn signal/signals of rotating transformer carries out the Signal Spacing conversion through miniature isolating transformer, produces one group of cosine and sine signal V ₁And V ₂, the digital angle φ that produces with up-down counter multiplies each other in the sine and cosine multiplier, obtains signal V ₃, V ₄Error signal kEoSin of output behind error amplifier (θ-φ), the closed loop that this error signal is formed through phase-sensitive demodulator, integrator, voltage controlled oscillator and up-down counter, seek the Sin (zero point of θ-φ), when this process is finished, VSin (θ-φ)＜1LSB, autosyn/rotary transformer shaft angle θ converts the up-down counter numeral angle φ output of parallel natural binary code form to; Export digital angle φ and digital angle φ is carried out digital processing and amplifying through the FPGA Programmable Logic Controller, make the digital angle of output step-length increase or reduce, reach the amplification of signal or dwindle, the digital angle σ of FPGA Programmable Logic Controller output is transported to the digital-analogue dc voltage changer of being made up of D/A converter, reference power supply and operational amplifier, become analog DC voltage signal Vo, finish shaft angle-DC voltage translation function, the digital-analogue dc voltage changer is provided with voltage gain and total null voltage adjustment; (among the θ-φ), k is a no-load voltage ratio, and Eo is the amplitude of reference voltage, and θ is the autosyn/rotary transformer shaft angle, and φ is the up-down counter numeral angle of parallel natural binary code form at kEoSin.

Technical matters to be solved by this invention can also further realize by following technical scheme.Above-described a kind of autosyn/rotary transformer-analog DC voltage transforming method, be characterized in, in the FPGA Programmable Logic Controller, the digital angle φ signal of input is selected control through mode, the digital angle φ ' of output is increased and linear increasing or linear the minimizing with input angle φ, after the design of arithmetic circuity realization pipelining, the output voltage of setting and the digital angle φ ' of input carry out multiplier computing and signal Processing, increase or reduce to export the step-length of digital angle signal, realize the amplification of digital signal or dwindle; Described multiplier is provided with reference clock and controls.

Technical matters to be solved by this invention can also further realize by following technical scheme.Above-described a kind of autosyn/rotary transformer-analog DC voltage transforming method, be characterized in, for the system that needs zero shift, the deviation angle tolerance ρ of input is by the FPGA Programmable Logic Controller, make deviation angle tolerance ρ and superpose through full adder by the digital angle after the signal Processing, realize finishing the skew of zero signal between the null position biasing scope-180 °-+180 °, described full adder is realized the pipelining design by arithmetic circuity; Enable control signal control output latch, make the angle output of skew numeral or the shutoff of full adder output; Described full adder is provided with reference clock and controls.

Be specifically addressed below.

1.1 autosyn/rotary transformer-digital conversion technique

Circuit is made up of seven parts such as miniature isolating transformer, sine and cosine multiplier, error amplifier, phase-sensitive demodulator, integrator, voltage controlled oscillator, up-down counters, has adopted 2 rank servo loops, the digital angle signal Continuous Tracking input shaft angle of output.If selsyn signal input, selsyn 3 line signals through miniature isolating transformer just converting to, the voltage signal V of cosine form ₁And V ₂

V ₁＝kEoSin?ω?t?Sinθ

V ₂＝kEoSin　ω?t?Cosθ

θ is the shaft angle of selsyn;

K is a no-load voltage ratio;

E0 is the amplitude of reference voltage;

ω is a carrier frequency, both the angular frequency of excitation voltage.

If the signals of rotating transformer input, rotary transformer 4 line signals only rise and isolate and hypotensive effect behind isolating transformer.

Suppose that the current digital angle of up-down counter is φ.So, V ₁, V ₂The digital angle φ of signal and up-down counter multiplies each other V in the sine and cosine multiplier ₁Multiply by cos φ, V2 multiply by sin φ and obtains voltage signal V ₃And V ₄:

V ₃＝kEoSin?ω?t?SinθCosφ

V ₄＝kEoSin?ω?t?CosθSinφ

These signals subtract each other through error amplifier and obtain:

V ₃-V ₄＝kEoSin?ω?t(sinθCosφ-CosθSinφ)＝kEoSin?ω?tSin(θ-φ)

(zero point of θ-φ) such as a closed loop system looks Sin who forms through phase-sensitive demodulator, integrator, voltage controlled oscillator and up-down counter etc.In the accuracy rating of converter regulation, up-down counter digital angle φ at this moment equals the shaft angle θ of autosyn/rotary transformer, with parallel natural binary code form output.

1.2 FPGA PLC technique

Adopt FPGA field-programmable controller technology design digital amplifier, its principle as shown in Figure 2.The signal of input is selected control through mode, and described mode selects control to have 2 kinds, and a kind of is that the zero-bit digital voltage is zero, and exporting digital angle φ ' increases and linear increasing with input angle φ; Another kind is that the zero-bit digital voltage is a maximal value, exporting digital angle φ ' increases and linear the minimizing with input angle φ, carry out multiplier computing and signal Processing by the output voltage of setting and the digital angle φ ' of input, increase or reduce to export the step-length of digital angle signal, realize the amplification of digital signal or dwindle.Digital amplifier is compared with analogue amplifier, and the voltage signal linearity of amplification is good, and the zero-point voltage error does not change with amplifier.For the system that needs zero shift, input deviation angle tolerance, the digital angle stack by full adder and conversion realizes the skew of null position.

In order significantly to improve the speed of system.Multiplier and full adder are realized the pipelining design by arithmetic circuity, and the logical operation that will finish in a clock is divided into the less operation of several steps, and insert the data throughput that several clock period improve system.

1.3 digital-analogue dc voltage conversion technology

The digital angle σ of FPGA Programmable Logic Controller output binary code, after buffering, be connected to the digital-analogue dc voltage changer, converter inside has the high precision reference power supply and the operational amplifier of D/A converter, band temperature compensation, has finished the conversion of parallel natural binary code to the analog DC voltage signal.The gain of output signal voltage and zero point can be regulated by potentiometer.Output dc voltage is directly proportional with the digital angle of the autosyn/rotary transformer of input, and the cycle changes.

1.4 technical performance index

Autosyn/rotary transformer-DC voltage conversion performance index is as shown in table 1.

Table 1:

Compared with prior art, the present invention is based on autosyn/rotary transformer-digital conversion technique, utilize that its tracing property is strong, speed is fast, the conversion accuracy advantages of higher, the digital-analogue dc voltage conversion technology of combined high precision and FPGA control technology able to programme realize that selsyn signal/signals of rotating transformer converts the analog DC voltage signal to.The present invention adopts hybrid integration technology, has the integrated level height, and is low in energy consumption, characteristics such as reliability height.The present invention adopts FPGA Controlled by Programmable Controller output analog DC voltage size, and the analog DC voltage of output is directly proportional with the angle of input.

Description of drawings

Fig. 1 is autosyn/rotary transformer-analog DC voltage transfer principle block diagram.

Fig. 2 is a FPGA field-programmable technical design digital amplifier schematic diagram.

Fig. 3 is that output voltage is not more than ± relation of input shaft angle-output dc voltage of 10V.

Fig. 4 is the relation of the input shaft angle-output dc voltage of the leading ρ angle of Fig. 3.

Fig. 5 is the lag behind relation of input shaft angle-output dc voltage of ρ angle of Fig. 3.

Fig. 6 is the pass that Fig. 3 exchanges the input shaft angle-output dc voltage behind input signal S1 and the S3

System.

Fig. 7 is the relation of angle input shaft angle-output dc voltage of the leading ρ of Fig. 6.

Fig. 8 is the lag behind relation of input shaft angle-output dc voltage of ρ angle of Fig. 6.

Fig. 9 is an output voltage greater than the relation of input shaft angle-output dc voltage of ± 10V.

Figure 10 is the pass that Fig. 9 exchanges the input shaft angle-output dc voltage behind input signal S1 and the S3

System.

Figure 11 is that output voltage is not more than+relation of input shaft angle-output dc voltage of 10V.

Figure 12 is the relation of the input shaft angle-output dc voltage of the leading ρ angle of Figure 11.

Figure 13 is the lag behind relation of input shaft angle-output dc voltage of ρ angle of Figure 11.

Figure 14 is the input shaft angle-output dc voltage after Figure 11 exchanges input signal S1 and S3

Relation.

Figure 15 is the relation of the input shaft angle-output dc voltage of the leading ρ angle of Figure 14.

Figure 16 is the lag behind relation of input shaft angle-output dc voltage of ρ angle of Figure 14.

Embodiment

Embodiment 1.With reference to Fig. 1.A kind of autosyn/rotary transformer-analog DC voltage transforming method is characterized in that, selsyn signal/signals of rotating transformer carries out the Signal Spacing conversion through miniature isolating transformer, produces one group of cosine and sine signal V ₁And V ₂, the digital angle φ that produces with up-down counter multiplies each other in the sine and cosine multiplier, obtains signal V ₃, V ₄Error signal KEoSin of output behind error amplifier (θ-φ), the closed loop that this error signal is formed through phase-sensitive demodulator, integrator, voltage controlled oscillator and up-down counter etc., seek the Sin (zero point of θ-φ), when this process is finished, VSin (θ-φ)＜1LSB, autosyn/rotary transformer shaft angle θ converts the digital angle φ output of parallel natural binary code form to; Export digital angle φ and digital angle φ is carried out digital processing and amplifying through the FPGA Programmable Logic Controller, make the digital angle of output step-length increase or reduce, reach the amplification of signal or dwindle, the digital angle σ of FPGA Programmable Logic Controller output is transported to the digital-analogue dc voltage changer of being made up of D/A converter, reference power supply and operational amplifier, become analog DC voltage signal Vo, finish shaft angle-DC voltage translation function, the digital-analogue dc voltage changer is provided with voltage gain and total null voltage adjustment.

Embodiment 2.With reference to Fig. 1, Fig. 2, in embodiment 1, in the FPGA Programmable Logic Controller, the digital angle φ signal of input is selected control through mode, linear increase or linearity reduce with input angle φ increase to make the digital angle φ ' of output, and after the design of arithmetic circuity realization pipelining, the digital angle φ ' of the output voltage of setting and input carries out multiplier computing and signal Processing, increase or reduce to export the step-length of digital angle signal, realize the amplification of digital signal or dwindle; Described multiplier is provided with reference clock and controls.

Embodiment 3.With reference to Fig. 1, Fig. 2, in embodiment 2, for the system that needs zero shift, the deviation angle tolerance ρ of input is by the FPGA Programmable Logic Controller, make deviation angle tolerance ρ and superpose through full adder by the digital angle after the signal Processing, realize finishing the skew of zero signal between the null position biasing scope-180 °-+180 °, described full adder is realized the pipelining design by arithmetic circuity; Enable control signal control output latch, make the angle output of skew numeral or the shutoff of full adder output; Described full adder is provided with reference clock and controls.

Embodiment 4.

For the selsyn input signal:

_VS1-S3＝kEoSin?ω?tSinθ

V _S3-S2＝kEoSin?ω?tSin(θ+120)

V _S2-S1＝kEoSin?ω?tSin(θ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSinθ

V _S2-S4＝kEoSin?ω?tCosθ

Output dc voltage | Vo|≤+ 10V, Vm≤+ 10V.Output voltage is proportional with the input shaft angle, when θ=179.99 °, and output voltage V o=Vm, when θ=180 °, output voltage V o=-Vm, its output waveform is as shown in Figure 3.

Embodiment 5.

For the selsyn input signal:

V _S1-S3＝kEoSin?ω?tSin(θ+ρ)

V _S3-S2＝kEoSin?ω?tSin(θ+ρ+120)

V _S2-S1＝kEoSin?ω?tSin(θ+ρ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSin(θ+ρ)

V _S2-S4＝kEoSin?ω?tCos(θ+ρ)

Output dc voltage | Vo|≤+ 10V, Vm≤+ 10V, ρ is a leading angle, 0 °＜ρ＜180 °.Output voltage is proportional with the input shaft angle, when θ+ρ=179.99 °, and output voltage V o=Vm, when θ+ρ=180 °, output voltage V o=-Vm, its output waveform is as shown in Figure 4.

Embodiment 6.

For the selsyn input signal:

V _S1-S3＝kEoSin?ω?tSin(θ-ρ)

V _S3-S2＝kEoSin?ω?tSin(θ-ρ+120)

V _S2-S1＝kEoSin?ω?tSin(θ-ρ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSin(θ-ρ)

V _S2-S4＝kEoSin?ω?tCos(θ-ρ)

Output dc voltage | Vo|≤+ 10V, Vm≤+ 10V, ρ is the hysteresis angle, 0 °＜ρ＜180 °.Output voltage is proportional with the input shaft angle, when θ-ρ=179.99 °, and output voltage V o=Vm, when θ-ρ=180 °, output voltage V o=-Vm, its output waveform is as shown in Figure 5.

Embodiment 7.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSinθ

V _S3-S2＝-kEoSinωtSin(θ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ+240)

For the rotary transformer input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSinθ

V _S2-S4＝kEoSin?ω?tCosθ

Output dc voltage | Vo|≤+ 10V, Vm≤+ 10V.Output voltage is proportional with the input shaft angle, when θ=179.99 °, and output voltage V o=-Vm, when θ=180 °, output voltage V o=Vm, its output waveform is as shown in Figure 6.

Embodiment 8.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ+ρ)

V _S3-S2＝-kEoSin?ω?tSin(θ+ρ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ+ρ+240)

For the rotary transformer input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ+ρ)

V _S2-S4＝kEoSin?ω?tCos(θ+ρ)

Output dc voltage | Vo|≤+ 10V, Vm≤+ 10V, ρ is a leading angle, 0 °＜ρ＜180 °.Output voltage is proportional with the input shaft angle, when θ+ρ=179.99 °, and output voltage V o=-Vm, when θ+ρ=180 °, output voltage V o=Vm, its output waveform is as shown in Figure 7.

Embodiment 9.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ-ρ)

V _S3-S2＝-kEoSin?ω?tSin(θ-ρ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ-ρ+240)

For the rotary transformer input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ-ρ)

V _S2-S4＝kEoSin?ω?tCos(θ-ρ)

Output dc voltage | Vo|≤+ 10V, Vm≤+ 10V, ρ is the hysteresis angle, 0 °＜ρ＜180 °.Output voltage is proportional with the input shaft angle, when θ-ρ=179.99 °, and output voltage V o=-Vm, when θ-ρ=180 °, output voltage V o=Vm, its output waveform is as shown in Figure 8.

Embodiment 10.

For the selsyn input signal:

V _S1-S3＝kEoSin?ω?tSinθ

V _S3-S2＝kEoSin?ω?tSin(θ+120)

V _S2-S1＝kEoSin?ω?tSin(θ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSinθ

V _S2-S4=kEoSin ω tCos θ output dc voltage | Vo| 〉+10V,

$\mathrm{\θm}=\frac{10}{\mathrm{Vo}}x180$

Output voltage is proportional with the input shaft angle, when 180 °〉θ 〉=θ _mThe time, output voltage V o=+10V is as 180 °+θ _mDuring θ 〉=180 °, and output voltage V o=-10V, its output waveform is as shown in Figure 9.

Embodiment 11.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSinθ

V _S3-S2＝-kEoSin?ω?tSin(θ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ+240)

For the rotary transformer input signal:

V _S1-S3＝-kEoSin?ω?tSinθ

V _S2-S4＝kEoSin?ω?tCosθ

Output dc voltage | Vo| 〉+10V,

$\mathrm{\θm}=\frac{10}{\mathrm{Vo}}x180$

Output voltage is proportional with the input shaft angle, when 180 °〉θ 〉=θ _mThe time, output voltage V o=-10V is as 180 °+θ _mDuring θ 〉=180 °, and output voltage V o=+10V, its output waveform is as shown in figure 10.

Embodiment 12.

For the selsyn input signal:

V _S1-S3＝kEoSin?ω?tSinθ

V _S3-S2＝kEoSin?ω?tSin(θ+120)

V _S2-S1＝kEoSin?ω?tSin(θ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSinθ

V _S2-S4＝kEoSin?ω?tCosθ

Output dc voltage 0V＜Vo≤+ 10V, Vm≤+ 10V.Output voltage is proportional with the input shaft angle, when θ=0 °, and output voltage V o=Vm, when θ=179.99 °, output voltage V o=0V, its output waveform is as shown in figure 11.

Embodiment 13.

For the selsyn input signal:

V _S1-S3＝kEoSin?ω?tSin(θ+ρ)

V _S3-S2＝kEoSin?ω?tSin(θ+ρ+120)

V _S2-S1＝kEoSin?ω?tSin(θ+ρ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSin(θ+ρ)

V _S2-S4＝kEoSin?ω?tCos(θ+ρ)

Output dc voltage 0V＜Vo≤+ 10V, ρ is a leading angle, Vm≤+ 10V, 0 °＜ρ＜90 °.Output voltage is proportional with the input shaft angle, when θ+ρ=0 °, and output voltage V o=Vm, when θ+ρ=179.99 °, output voltage V o=0V, its output waveform is as shown in figure 12.

Embodiment 14.

For the selsyn input signal:

V _S1-S3＝kEoSin?ωtSin(θ-ρ)

V _S3-S2＝kEoSin?ω?tSin(θ-ρ+120)

V _S2-S1＝kEoSin?ω?tSin(θ-ρ+240)

For the rotary transformer input signal:

V _S1-S3＝kEoSin?ω?tSin(θ-ρ)

V _S2-S4＝kEoSin?ω?tCos(θ-ρ)

Output dc voltage 0V＜Vo≤+ 10V, ρ is the hysteresis angle, Vm≤+ 10V.Output voltage is proportional with the input shaft angle, and 0 °＜ρ＜180 °, when θ-ρ=0 °, output voltage V o=Vm, when θ-ρ=179.99 °, output voltage V o=0V, its output waveform is as shown in figure 13.

Embodiment 15.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSinθ

V _S3-S2＝-kEoSin?ω?tSin(θ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ+240)

For the rotary transformer input signal:

V _S1-S3＝-kEoSin?ω?tSinθ

V _S2-S4＝kEoSin?ω?tCosθ

Output dc voltage 0V＜Vo≤+ 10V, Vm≤+ 10V.Output voltage is proportional with the input shaft angle, when θ=0 °, and output voltage V o=OV, when θ=179.99 °, output voltage V o=Vm, its output waveform is as shown in figure 14.

Embodiment 16.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ+ρ)

V _S3-S2＝-kEoSin?ω?tSin(θ+ρ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ+ρ+240)

For the rotary transformer input signal:

V _S1-S3＝-kEoSin?ω?tSin(θ+ρ)

V _S2-S4＝kEoSin?ω?tCos(θ+ρ)

Output dc voltage 0V＜Vo≤+ 10V, ρ is a leading angle, Vm≤+ 10V.Output voltage is proportional with the input shaft angle, and 0 °＜ρ＜90 °, when θ+ρ=0 °, output voltage V o=0V, when θ+ρ=179.99 °, output voltage V o=Vm, its output waveform is as shown in figure 15.

Embodiment 17.

For the selsyn input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ-ρ)

V _S3-S2＝-kEoSin?ω?tSin(θ-ρ+120)

V _S2-S1＝-kEoSin?ω?tSin(θ-ρ+240)

For the rotary transformer input signal, S1 and S3 exchange back:

V _S1-S3＝-kEoSin?ω?tSin(θ-ρ)

V _S2-S4＝kEoSin?ω?tCos(θ-ρ)

Output dc voltage 0＜Vo≤+ 10V, ρ is the hysteresis angle, Vm≤+ 10V, 0 °＜ρ＜90 °.Output voltage is proportional with the input shaft angle, when θ-ρ=0 °, and output voltage V o=0V, when θ-ρ=179.99 °, output voltage V o=Vm, its output waveform is as shown in figure 16.

Claims (3)

1. a kind of synchro/resolver-analog DC voltage conversion method, it is characterized in that, synchro signal/resolver signal carries out signal isolation transformation through miniature isolation transformer, produces one group of sine-cosine signals V ₁ and V _2. Multiply the digital angle φ generated by the reversible counter in the sine-cosine multiplier to obtain signals V ₃ and V ₄ , and output an error signal kEoSin(θ-φ) after passing through the error amplifier. This error signal is demodulated by phase sensitivity A closed-loop loop composed of an integrator, an integrator, a voltage-controlled oscillator and a reversible counter is used to find the zero point of Sin(θ-φ), when this process is completed, VSin(θ-φ)<1LSB, the self-aligning machine/rotation The transformer shaft angle θ is converted into a reversible counter digital angle φ output in the form of parallel natural binary code; the output digital angle φ is digitally amplified by the FPGA programmable controller to increase or decrease the step size of the output digital angle to reach the signal The digital angle σ output by the FPGA programmable controller is sent to the digital-analog DC voltage converter composed of D/A converter, reference power supply and operational amplifier, and becomes an analog DC voltage signal Vo to complete the shaft angle — DC voltage conversion function, digital-to-analog DC voltage converter sets the voltage gain and zero voltage adjustment; in kEoSin(θ-φ), k is the transformation ratio, Eo is the amplitude of the reference voltage, and θ is the self-adjustment angle Machine/resolver shaft angle, φ is the digital angle of the reversible counter in the form of parallel natural binary code. 2. a kind of self-aligning machine/revolving transformer according to claim 1-analog DC voltage conversion method, it is characterized in that, in FPGA programmable controller, the digital angle φ signal of input is controlled through mode selection, makes output The digital angle φ' increases or decreases linearly with the increase of the input angle φ. After the pipeline technology design is realized through the arithmetic operation circuit, the set output voltage and the input digital angle φ' perform multiplier operation and signal processing to increase or decrease The step length of the digital angular signal is output to realize the amplification or reduction of the digital signal; the multiplier is controlled by a reference clock. 3. A kind of autosynchronizer/resolver according to claim 2-analog DC voltage conversion method, it is characterized in that, for the system that needs zero offset, the offset angle amount p of input is controlled by FPGA programmable device, so that the offset angle ρ and the digital angle after signal processing are superimposed by the full adder to realize the offset range of the zero point position between -180°—+180°, and complete the offset of the zero position signal. The full adder The adder realizes the design of pipeline technology through the arithmetic operation circuit; the enable control signal controls the output latch, so that the offset digital angle output by the full adder is output or turned off; the full adder is provided with a reference clock for control.

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