CN111752310A - High-precision shaft angle signal conversion module - Google Patents
High-precision shaft angle signal conversion module Download PDFInfo
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Abstract
The embodiment of the invention provides a high-precision shaft angle signal conversion module which comprises an excitation conditioning circuit, a digital latch, an FPGA (field programmable gate array), a DA (digital-to-analog) converter, a power amplification protection circuit and an output transformer, wherein the excitation conditioning circuit is connected with the digital latch; the output end of the DA digital-to-analog converter is connected with the output transformer through the power amplifier and the overcurrent and overvoltage protection circuit in sequence. The high-precision shaft angle signal conversion module provided by the embodiment of the invention has a simple structure and a small volume, adopts the FPGA to directly control the DA digital-to-analog converter to generate a three-wire/four-wire shaft angle signal, and the three-wire/four-wire shaft angle signal is output through the power amplification protection circuit and the output transformer, has the maximum 5VA load capacity and 16-bit conversion precision, and has overcurrent and overheat protection functions. The problem that the existing digital-synchro/rotary transformer converter is large in size, single in function, free of overcurrent and overheat protection and capable of influencing use and installation of the converter is solved.
Description
Technical Field
The embodiment of the invention relates to the field of embedded signal processing, in particular to a high-precision shaft angle signal conversion module.
Background
In an angle position control system, along with the development of an axis angle conversion technology, higher requirements are put on the accuracy, the function, the volume, the process requirements, the heat dissipation and the like of an axis angle converter.
The high-precision digital-axial angle signal conversion module has the advantages of 16-bit precision, small volume, data storage, overcurrent and overheat protection and the like on the basis of meeting the signal conversion function from a digital to a synchro/rotary transformer. The method has a larger application space in high-precision detection equipment such as laboratories and the like for a single-channel application scene with higher precision.
The digital-selsyn/resolver converters in large use today are mainly composed of the following parts: a reference transformer, a quadrant selection switch, a sine and cosine multiplier, a power amplifier, an output transformer and the like. The working principle is as follows: after the reference signal is isolated and reduced by a transformer, the reference signal is used as a voltage reference of an angle analog signal, a digital full-angle quantity (14-bit natural binary code) is introduced, the reference signal is converted into a sine and cosine signal representing an angle through a sine multiplier and a cosine multiplier, the sine and cosine signal has the load capacity of 1.3VA after being amplified by a power amplifier, and the reference signal is isolated and increased by an output transformer and then is converted into a three-wire/four-wire analog signal in a self-angle machine/rotary transformer form to be output.
The existing digital-synchro/rotary transformer converter mainly adopts a multiplier to generate sine and cosine signals, then carries out signal conversion through a Scott transformer, and converts the signals into three-wire/four-wire signals, wherein the resolution is generally 12 bits and 14 bits, the precision is generally 10 bits and 12 bits, the size is large, the function is single, and no overcurrent and overheat protection exists, so that the use and the installation of the converter are influenced.
Disclosure of Invention
The embodiment of the invention provides a high-precision shaft angle signal conversion module which is used for solving the problems that the existing digital-selsyn/rotary transformer converter is large in size, single in function and free of overcurrent and overheat protection, and the use and installation of the converter are affected.
The embodiment of the invention provides a high-precision shaft angle signal conversion module which comprises an excitation conditioning circuit, a digital latch, an FPGA (field programmable gate array), a DA (digital-to-analog) converter, a power amplification protection circuit and an output transformer, wherein the excitation conditioning circuit is connected with the digital latch;
the excitation conditioning circuit is connected with a first input end of the DA digital-to-analog converter, and outputs a reference signal to the DA digital-to-analog converter as a reference input of the DA digital-to-analog converter;
the digital latch is connected with a second input end of the DA digital-to-analog converter through the FPGA, and an output end of the DA digital-to-analog converter is connected with an output transformer through a power amplifier and an overcurrent and overvoltage protection circuit in sequence;
the external input 16-bit binary angle code enters the FPGA through the digital latch, the FPGA analyzes the input binary angle code and controls the DA digital-to-analog converter to generate a three-wire/four-wire axial angle signal, and the three-wire/four-wire axial angle signal outputs a three-wire auto-angle machine signal or a four-wire two-phase rotary transformer signal through the power amplification protection circuit and the output transformer.
Further, the excitation conditioning circuit comprises a first transformer and an operational amplifier; the first transformer is connected with the first input end of the DA digital-to-analog converter through an operational amplifier.
Further, the operational amplifier is AD8512 BRZ.
Further, the digital latch is SN74AHC 373.
Further, the FPGA adopts XC3S50AN chips.
Further, the DA digital-to-analog converter is AD5543 BRM.
Further, the power amplification protection circuit comprises a power amplification circuit and a protection circuit, the power amplification circuit comprises a power amplifier connected with the output end of the DA digital-to-analog converter, and the protection circuit comprises a thermistor connected with the power amplifier.
Further, the power amplifier is of the type OPA 548.
Further, the output transformer comprises a second transformer, a third transformer and a fourth transformer which are connected in a star shape.
The high-precision shaft angle signal conversion module provided by the embodiment of the invention has a simple structure and a small volume, adopts the FPGA to directly control the DA digital-to-analog converter to generate a three-wire/four-wire shaft angle signal, and the three-wire/four-wire shaft angle signal is output through the power amplification protection circuit and the output transformer, has the maximum 5VA load capacity and 16-bit conversion precision, and has overcurrent and overheat protection functions. The problem that the existing digital-synchro/rotary transformer converter is large in size, single in function, free of overcurrent and overheat protection and capable of influencing use and installation of the converter is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-precision shaft-angle signal conversion module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a high-precision shaft-angle signal conversion module according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of an excitation conditioning circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a digital latch according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an FPGA provided in an embodiment of the present invention;
fig. 6 is a circuit diagram of a DA digital-to-analog converter according to an embodiment of the present invention;
fig. 7 is a circuit diagram of a power amplification protection circuit according to an embodiment of the present invention;
fig. 8(a) is a schematic structural diagram of an output transformer according to an embodiment of the present invention;
fig. 8(b) is another schematic structural diagram of an output transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Fig. 1 is a schematic structural diagram of a high-precision shaft angle signal conversion module according to an embodiment of the present invention, and referring to fig. 1, the high-precision shaft angle signal conversion module includes an excitation conditioning circuit, a digital latch, an FPGA, a DA digital-to-analog converter, a power amplification protection circuit, and an output transformer;
the excitation conditioning circuit is connected with a first input end of the DA digital-to-analog converter, and outputs a reference signal to the DA digital-to-analog converter as a reference input of the DA digital-to-analog converter;
the digital latch is connected with a second input end of the DA digital-to-analog converter through the FPGA, and an output end of the DA digital-to-analog converter is connected with an output transformer through a power amplifier and an overcurrent and overvoltage protection circuit in sequence;
the external input 16-bit binary angle code enters the FPGA through the digital latch, the FPGA analyzes the input binary angle code and controls the DA digital-to-analog converter to generate a three-wire/four-wire axial angle signal, and the three-wire/four-wire axial angle signal outputs a three-wire auto-angle machine signal or a four-wire two-phase rotary transformer signal through the power amplification protection circuit and the output transformer.
Fig. 2 is a schematic diagram of a high-precision shaft-angle signal conversion module according to an embodiment of the present invention, and referring to fig. 1 and fig. 2, in this embodiment, the excitation conditioning circuit includes a first transformer and an operational amplifier, and the first transformer is connected to the first input terminal of the DA digital-to-analog converter through the operational amplifier. The first transformer performs transformation ratio adjustment according to externally input excitation voltage, an AD8512BRZ of ADI company is selected as a chip of the operational amplifier, and the operational amplifier outputs a reference signal as the reference input of the DA converter.
The external input 16-bit binary angle code enters the FPGA through the digital latch, the FPGA analyzes the input binary angle code, synchronously calculates digital quantity required by three paths of DA and inputs the digital quantity into the DA digital-to-analog converter, the DA digital-to-analog converter generates a three-wire/four-wire axial angle signal according to the digital quantity required by the three paths of DA, and the three-wire/four-wire axial angle signal outputs a three-wire self-leveling machine signal or a four-wire two-phase rotary transformer signal through the power amplification protection circuit and the output transformer.
The high-precision shaft angle signal conversion module also comprises a power supply module, and the power supply module is connected with each part of the high-precision shaft angle signal conversion module in the figure 1 and supplies power for each part in the high-precision shaft angle signal conversion module.
The high-precision shaft angle signal conversion module provided by the embodiment of the invention has a simple structure and a small volume, adopts the FPGA to directly control the DA digital-to-analog converter to generate a three-wire/four-wire shaft angle signal, and the three-wire/four-wire shaft angle signal is output through the power amplification protection circuit and the output transformer, has the maximum 5VA load capacity and 16-bit conversion precision, and has overcurrent and overheat protection functions. The problem that the existing digital-synchro/rotary transformer converter is large in size, single in function, free of overcurrent and overheat protection and capable of influencing use and installation of the converter is solved.
Fig. 3 is a circuit diagram of an excitation conditioning circuit according to an embodiment of the present invention, as shown in fig. 3, RH and RL in fig. 3 are external excitation voltage signal inputs, and REF0 is an excitation conditioning circuit output. After the RH and RL are isolated and transformed into lower voltage by a transformer, an excitation voltage signal is amplified and output by a forward proportional amplifying circuit consisting of an operational amplifier AD8512BRZ and a peripheral resistor thereof, and a reference signal is output to a DA digital-to-analog converter by a rear stage of the forward proportional amplifying circuit through an RC filter circuit.
Fig. 4 is a schematic diagram of a digital latch according to an embodiment of the present invention, in which the digital latch is an SN74AHC 373.
Specifically, referring to fig. 1 and 4, the digital latch employs two SN74AHC373 of TI corporation, and each SN74AHC373 latches and controls 8-bit data input. The 16-bit binary angle code digital quantity enters the FPGA through a digital latch SN74AHC373 to mainly realize level conversion and isolation protection, and the FPGA realizes a bus latching function by controlling an enabling end of a driver.
Fig. 5 is a schematic diagram of an FPGA according to an embodiment of the present invention. As shown in FIG. 5, XC3S50AN of Xilinx company is selected for 3 FPGA, 25MHz clock is used as a system clock, and 16-bit digital input, 2-bit control input and 3 groups of SPI interfaces are connected.
The 25MHz clock oscillator provides a clock to be directly supplied to the FPGA, and the FPGA buffers and divides the frequency through an internal clock IP core and the clock BUF to be used as a main clock and a control DA clock. The FPGA controls the DA converter through 3 groups of SPI interfaces, and pins of the 3 groups of SPI interfaces comprise DA _ CLK _0, DA _ SDI _0 and DA _ CS _0 in the graph of FIG. 5; DA _ CLK _1, DA _ SDI _1, DA _ CS _ 1; DA _ CLK _2, DA _ SDI _2, and DA _ CS _ 2. The FPGA control needs to meet DA output time sequence, and a DA conversion chip manual can be referred.
The FPGA has 16-bit digital input, such as OD1-OD16, and the input data required by the DA conversion chip is calculated by performing table lookup according to the input digital quantity. Two control pins accessed by the FPGA, ENL and ENM control the input enable of the low 8 bits and the high 8 bits of 16-bit digital quantity, and are suitable for the 16-bit data format and the 8-bit data format of the system.
Fig. 6 is a circuit diagram of a DA digital-to-analog converter according to an embodiment of the present invention. The DA digital-to-analog converter is AD5543 BRM. Specifically, an AD5543BRM chip of 3 ADI companies is selected as a DA digital-to-analog converter, and the FPGA simultaneously performs data control through interfaces of 3 DA chips and outputs analog waveforms in real time. And 3 DA chips adopt the reference signal output by the excitation conditioning circuit as a reference standard. The DA chip is referred to as AD5543BRM chip.
The AD5543 is a current type digital-to-analog conversion chip, as shown in figure 6, an input current is converted into a voltage signal through a 33pF capacitor and an operational amplifier AD8512, an addition circuit consisting of a precision resistor and the operational amplifier adds the voltage signal converted by the output of the AD5543 and a reference signal, and the DA output voltage range is adjusted to be-REF to + REF; the REF is a reference standard of the output of the excitation conditioning circuit, and the DA output is calculated and controlled by combining the FPGA, so that the output range required by the conversion module can be met. In the figure, REF0 is a reference, and DA _ OUT [0], DA _ OUT [1], DA _ OUT [2] are DA conversion chip outputs.
The 3 paths of DA circuits are kept consistent, the FPGA processes three paths of data in parallel, and the data and the FPGA interconnection pins are DA _ CLK _0, DA _ SDI _0 and DA _ CS _0 in the figure; DA _ CLK _1, DA _ SDI _1, DA _ CS _ 1; DA _ CLK _2, DA _ SDI _2, DA _ CS _ 2; and synchronously outputting by the three SPI interfaces.
Fig. 7 is a circuit diagram of a power amplification protection circuit according to an embodiment of the present invention, where the power amplification protection circuit includes a power amplification circuit and a protection circuit, the power amplification circuit includes a power amplifier connected to an output terminal of a DA digital-to-analog converter, and the protection circuit includes a thermistor connected to the power amplifier. The power amplifier is of the type OPA 548.
Specifically, as shown in fig. 7, DA _ OUT [0], DA _ OUT [1], and DA _ OUT [2] are input to the power amplifier circuit, and power amplification is performed through an OPA548 amplifier, the amplifier and precision resistors such as RJ35 and RJ36 form a forward proportional amplifier circuit, and gain amplification is performed on an output signal, where 10K resistances are selected, and the output voltage Vout is 2 Vin. The output voltage is ensured to meet the requirements of the converter, and the output voltage is ensured to be 10Vrms in the invention.
In the figure, RT1, RT2 and RT3 are thermistors, and the resistance at normal temperature is 240K ohm; the power amplifier OPA548 has a current limiting function, and can limit the output current of the power amplifier by adjusting the resistance value of the RT resistor, and the current limiting formula is as follows:
RT＝15000*(4.75V)/Ilim-13750Ω
selecting a thermistor attached heat dissipation substrate as an overheating protection device, controlling a power amplifier to perform circuit protection, and when the temperature of a thermal interface of the power amplifier reaches 120 ℃, starting an overheating protection circuit and turning off the output of a power driver; when the temperature of the thermal interface of the power amplifier is reduced to below 120 ℃, the overheat protection circuit is closed, and the power drive automatically recovers the amplification function. When the driving current is too large due to short circuit and rotation blockage of an angle sensor such as an external synchro or a rotary transformer connected with the output transformer, the power amplification circuit is automatically closed to protect the converter from damage. The heat generated by the power amplifying circuit is dissipated through the ceramic substrate.
Fig. 8(a) is a schematic structural diagram of an output transformer according to an embodiment of the present invention, and as shown in fig. 8(a), the output transformer includes a second transformer, a third transformer, and a fourth transformer that are connected in a star shape. And outputting a three-wire synchro signal in a star connection mode by three identical transformers.
Fig. 8(b) is another schematic structural diagram of an output transformer according to an embodiment of the present invention, and as shown in fig. 8(b), in the embodiment, the output transformer includes a fifth transformer and a sixth transformer. At this time, the output transformer outputs a rotary transformer signal of four lines and two phases.
In an optional embodiment, the FPGA parses an input binary angle code to control the DA dac to generate a three-wire/four-wire axis angle signal, which specifically includes: and the FPGA synchronously calculates the digital quantity required by the three paths of DA through analyzing the input binary angle code and a three-path axis angle signal algorithm. The three-path shaft angle signal algorithm is as follows:
1) when a three-wire selsyn signal needs to be output through the high-precision shaft angle signal conversion module, the output transformer adopts a structure as shown in fig. 8(a), and the input reference voltage is assumed as follows: eRL-RH＝EoSin ωt；
Wherein Eo is the reference voltage amplitude, the output signal of the synchro is:
Es1-s3＝KEo Sinωt Sinθ
Es3-s2＝KEo Sinωt Sin(θ+120°)
Es2-s1＝KEo Sinωt Sin(θ-120°)
where K is a scaling factor, ω is a reference angular rate, and the reference signal frequency may be 400 Hz; and theta is the input binary angle code. The reference voltage, the reference voltage amplitude and the reference angular rate are obtained according to a reference signal output by the excitation conditioning circuit.
For the synchro, the signal requirement mode is line-line voltage, and the output of the DA conversion is a single-end signal to ground, and algorithm conversion is needed here:
taking Es1-S3 as the output S1 of DA1, Es3-S2 as the output S2 of DA2, and Es2-S1 as the output S3 of DA3, then:
Vs1-s3＝ERL-RH*Sinωt*Sinθ-ERL-RH*Sinωt*Sin(θ-120°)
Vs3-s2＝ERL-RH*Sinωt*Sin(θ-120°)-ERL-RH*Sinωt*Sin(θ+120°)
Vs2-s1＝ERL-RH*Sinωt*Sin(θ+120°)-ERL-RH*Sinωt*Sinθ
solving and calculating:
according to the formula, in order to meet the requirement that the phase difference of theta 1 in the three signal line voltages is 120 degrees;
output S1 is connected: es2-s1 ═ ERL-RH*Sinωt*Sin(θ-120°)；
Output S2 is connected: es3-s2 ═ ERL-RH*Sinωt*Sin(θ+120°)；
Output S3 is connected: es1-s3 ═ ERL-RH*Sinωt*Sinθ；
After the interchange there are:
comparing the signal of the synchro with the output excitation signal of the D/A board, the amplitude is different
The number of times of the total number of the parts,
angle theta1＝θ+210°。
2) When the resolver signal needs to be output through the high-precision shaft angle signal conversion module, the output transformer adopts the structure shown in fig. 8(b) at this time, and it is assumed that the input reference voltage is: eRL-RH＝EoSin ωt；
Wherein Eo is the reference voltage amplitude, the output resolver signal is:
Es3-s1＝KEo Sinωt Sinθ
Es2-s4＝KEo Sinωt Cosθ
where K is a scaling factor, ω is a reference angular rate, and the reference signal frequency may be 400 Hz; and theta is the input binary angle code. The reference voltage, the reference voltage amplitude and the reference angular rate are obtained according to a reference signal output by the excitation conditioning circuit.
For the rotary transformer, the control output of Es3-s1 ═ KEo Sin ω t Sin θ and Es2-s4 ═ KEoSin ω t Cos θ can be realized by a lookup table and a cordic algorithm respectively through 2-path DA, and the lookup table is only used for storing 1/4 period data corresponding to 16-bit digital input quantity by adopting a lookup table mode in the invention.
The high-precision shaft angle signal conversion module provided by the embodiment of the invention has a simple structure and a small volume, adopts the FPGA to directly control the DA digital-to-analog converter to generate a three-wire/four-wire shaft angle signal, and the three-wire/four-wire shaft angle signal is output through the power amplification protection circuit and the output transformer, has the maximum 5VA load capacity and 16-bit conversion precision, and has overcurrent and overheat protection functions. The problem that the existing digital-synchro/rotary transformer converter is large in size, single in function, free of overcurrent and overheat protection and capable of influencing use and installation of the converter is solved.
It should be noted that, in the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A high-precision shaft angle signal conversion module is characterized by comprising an excitation conditioning circuit, a digital latch, an FPGA, a DA digital-to-analog converter, a power amplification protection circuit and an output transformer;
the excitation conditioning circuit is connected with a first input end of the DA digital-to-analog converter, and outputs a reference signal to the DA digital-to-analog converter as a reference input of the DA digital-to-analog converter;
the digital latch is connected with a second input end of the DA digital-to-analog converter through the FPGA, and an output end of the DA digital-to-analog converter is connected with an output transformer through a power amplifier and an overcurrent and overvoltage protection circuit in sequence;
the external input 16-bit binary angle code enters the FPGA through the digital latch, the FPGA analyzes the input binary angle code and controls the DA digital-to-analog converter to generate a three-wire/four-wire axial angle signal, and the three-wire/four-wire axial angle signal outputs a three-wire auto-angle machine signal or a four-wire two-phase rotary transformer signal through the power amplification protection circuit and the output transformer.
2. The high-precision shaft-angle signal conversion module according to claim 1, wherein the excitation conditioning circuit comprises a first transformer and an operational amplifier; the first transformer is connected with the first input end of the DA digital-to-analog converter through an operational amplifier.
3. The high-precision shaft-angle signal conversion module according to claim 1, wherein the operational amplifier is AD8512 BRZ.
4. The high precision shaft angle signal conversion module of claim 1, wherein the digital latch is SN74AHC 373.
5. The high-precision shaft angle signal conversion module according to claim 1, wherein the FPGA is an XC3S50AN chip.
6. The high precision shaft angle signal conversion module of claim 1, wherein the DA digital-to-analog converter is AD5543 BRM.
7. The high-precision shaft-angle signal conversion module of claim 1, wherein the power amplification protection circuit comprises a power amplification circuit and a protection circuit, the power amplification circuit comprises a power amplifier connected with an output end of the DA digital-to-analog converter, and the protection circuit comprises a thermistor connected with the power amplifier.
8. The high precision shaft angle signal conversion module of claim 1, wherein the power amplifier is of type OPA 548.
9. The high accuracy shaft angle signal conversion module of claim 1, wherein the output transformer comprises a star connected second transformer, third transformer and fourth transformer.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2727705Y (en) * | 2004-08-31 | 2005-09-21 | 江苏自动化研究所 | A digital/axial angle converter |
| CN203224620U (en) * | 2013-04-16 | 2013-10-02 | 成都远望科技有限责任公司 | Radar data acquisition device based on ultrahigh speed USB |
| CN103776364A (en) * | 2014-01-24 | 2014-05-07 | 北京航天控制仪器研究所 | Angle measurement and fault diagnose system with spinning warning function |
| CN104238398A (en) * | 2013-06-24 | 2014-12-24 | 成都旋极历通信息技术有限公司 | Multi-channel synchronous data acquisition card based on PC104 bus |
| CN105699957A (en) * | 2016-03-17 | 2016-06-22 | 天津超智海洋科技有限公司 | Multi-array element sonar signal acquisition circuit |
| CN107643090A (en) * | 2017-09-04 | 2018-01-30 | 南京理工大学 | The digital angle conversion method of autosyn/rotary transformer |
-
2020
- 2020-05-20 CN CN202010432257.XA patent/CN111752310A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2727705Y (en) * | 2004-08-31 | 2005-09-21 | 江苏自动化研究所 | A digital/axial angle converter |
| CN203224620U (en) * | 2013-04-16 | 2013-10-02 | 成都远望科技有限责任公司 | Radar data acquisition device based on ultrahigh speed USB |
| CN104238398A (en) * | 2013-06-24 | 2014-12-24 | 成都旋极历通信息技术有限公司 | Multi-channel synchronous data acquisition card based on PC104 bus |
| CN103776364A (en) * | 2014-01-24 | 2014-05-07 | 北京航天控制仪器研究所 | Angle measurement and fault diagnose system with spinning warning function |
| CN105699957A (en) * | 2016-03-17 | 2016-06-22 | 天津超智海洋科技有限公司 | Multi-array element sonar signal acquisition circuit |
| CN107643090A (en) * | 2017-09-04 | 2018-01-30 | 南京理工大学 | The digital angle conversion method of autosyn/rotary transformer |
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