CN114543845A - Flexible and expandable shaft angle digital conversion device - Google Patents
Flexible and expandable shaft angle digital conversion device Download PDFInfo
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- CN114543845A CN114543845A CN202210168292.4A CN202210168292A CN114543845A CN 114543845 A CN114543845 A CN 114543845A CN 202210168292 A CN202210168292 A CN 202210168292A CN 114543845 A CN114543845 A CN 114543845A
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Abstract
The invention discloses a flexible and expandable shaft angle digital conversion device, which belongs to the technical field of angle detection and comprises at least two shaft angle conversion modules, a digital signal processing module (CPLD), a microcontroller module (DSP controller), at least one DC/DC module and at least one DC/AC module. The invention can be compatible with single-double channel rotary transformers and various rotary transformer transformation ratios; the analog signal of the rotary transformer CAN be converted into a digital signal, and the digital signal is transmitted out through a synchronous serial port, an asynchronous serial port, a network port and a CAN communication port and is provided for acquisition equipment; the excitation power supply required by different rotary transformers can be output, the problems of input signal compatibility and output interface compatibility are solved, the equipment cost is reduced, the debugging time is shortened, the system reliability is improved, and the excitation power supply is worthy of being popularized and used.
Description
Technical Field
The invention relates to the technical field of angle detection, in particular to a flexible and expandable shaft angle digital conversion device.
Background
The rotary transformer is widely applied to angle detection occasions and widely applied to angle position control systems in the fields of aviation, aerospace, navigation, weaponry and the like. Along with the requirement on the precision of angle detection, the types of the rotary transformers are more and more, a single-channel rotary transformer and a double-channel rotary transformer are provided, the transformation ratio of each rotary transformer is different, independent shaft angle decoding chips and rotary transformer excitation power supplies are purchased in the application occasions of the rotary transformers at present, then redesign production is carried out according to system requirements, different rotary transformers all need shaft angle decoding chips of different models, different types of rotary transformers require different excitation power supplies to supply power for the rotary transformers, angle information converted by the shaft angle decoding chips is transmitted to the outside in a digital parallel port mode, each product is redesigned in use, production and debugging are carried out, and the time cost and the production cost are higher. The above problems are to be solved, and a flexible and expandable digital converter for shaft angle is proposed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to solve the compatibility problem when the angle of multiple rotary transformers is decoded, a flexible and extensible shaft angle digital conversion device is provided, the problems of compatibility of different rotary transformer power supplies, input signals and output interfaces are solved, the equipment cost is reduced, the debugging time is shortened, and the system reliability is improved.
The invention solves the technical problems through the following technical scheme
The device comprises two shaft angle conversion modules, a CPLD, a DSP controller, a DC/DC module and a DC/AC module;
the shaft angle conversion module is used for converting the analog angle signal of the rotary transformer into a parallel digital quantity signal;
the CPLD is used for encoding and outputting the angle digital signal;
the DSP controller is used for receiving external dial signals, converting the corresponding dial signals into signals with different levels to control single and double channels and output digital quantity digits of the shaft angle conversion module, and generating a reference clock signal to control the output coding frequency of the CPLD;
the DC/DC module is used for converting an external input direct-current power supply into a direct-current power supply required by each hardware;
the DC/AC module is used for converting the direct current power supply converted by the DC/DC module into an alternating current power supply used by a rotary transformer;
an external input direct current power supply is respectively input into the two shaft angle conversion modules and the DC/AC module after the conversion of the DC/DC module, analog angle signals of the two rotary transformers are respectively input into the two shaft angle conversion modules, the two shaft angle conversion modules are respectively connected with the CPLD, the CPLD is connected with the DSP controller, the DSP controller is respectively connected with the shaft angle conversion modules, one output end of the DC/AC module is connected with the rotary transformers to output excitation power to the rotary transformers, and the other output end of the DC/AC module is connected with the shaft angle conversion modules.
Further, the range of the external input DC power is +18V to +28V, and in this embodiment, a DC power input of +24VDC is selected, one of the DC/DC modules may convert the external input DC power of +24VDC into +5VDC, +15VDC, -15VDC, and the DC/AC module may convert the DC power of +15VDC, -15VDC into 26VAC (2000Hz, 2600Hz) or 36VAC (2000 Hz).
Furthermore, in the shaft angle conversion module, an analog angle signal of the rotary transformer is converted into a digital quantity signal of 16-19 bits in parallel.
Furthermore, in the CPLD, the digital signals are encoded according to the usage requirements of different external output interfaces, so that the digital signals are transmitted through each output interface of the DSP controller.
Furthermore, a plurality of output interfaces, namely a serial port, a network port and a CAN port, are arranged on the DSP controller, and the serial port is divided into an asynchronous serial port and a synchronous serial port.
Furthermore, the shaft angle digital conversion device also comprises a power input interface, and an external input direct current power supply is input into the DC/DC module through the power input interface.
Furthermore, the shaft angle digital conversion device further comprises a rotary transformer input interface, and an analog angle signal of the rotary transformer is input into the shaft angle conversion module through the rotary transformer input interface.
Furthermore, the angles of the two rotary transformers can be collected and coded at the same time, which is the first working mode, or only one angle value of the rotary transformer can be collected and coded, which is the second working mode.
Furthermore, the DSP controller is also provided with a hardware setting port, and the corresponding hardware bit is set through the hardware setting port, and the level of the hardware bit is raised to +5VDC, so that the working mode selection, the decoding output bit number selection and the communication baud rate selection of the shaft angle conversion module are realized.
Furthermore, the DSP controller and the CPLD are both provided with programming ports, and the DSP controller is connected with the CPLD through a digital interface.
Compared with the prior art, the invention has the following advantages: the flexible extensible shaft angle digital conversion device can be compatible with a single-channel rotary transformer, a double-channel rotary transformer and a plurality of rotary transformer transformation ratios; the analog signal of the rotary transformer CAN be converted into a digital signal, and the digital signal is transmitted out through a synchronous serial port, an asynchronous serial port, a network port and a CAN communication port and is provided for acquisition equipment; the excitation power supply required by different rotary transformers can be output, the problems of input signal compatibility and output interface compatibility are solved, the equipment cost is reduced, the debugging time is shortened, the system reliability is improved, and the excitation power supply is worthy of being popularized and used.
Drawings
FIG. 1 is a top view of the internal layout of a digital converter for central axis angles according to a second embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of a digital conversion device for central axis angles;
FIG. 3 is a side view of a digital converter for central axis angles according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a single-channel digital shaft angle converter according to a second embodiment of the present invention;
fig. 5 is a schematic block diagram of the shaft angle digital conversion device expanded into two paths in the second embodiment of the present invention;
fig. 6 is a block diagram of a software structure of the digital conversion device of axial angle in the second embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example one
The embodiment provides a technical scheme: a flexible and expandable digital conversion device for shaft angles comprises two shaft angle conversion modules, a CPLD, a DSP controller, a DC/DC module and a DC/AC module;
the shaft angle conversion module is used for converting the analog angle signal of the rotary transformer into a parallel digital quantity signal;
the CPLD is used for encoding and outputting the angle digital signal;
the DSP controller is used for receiving external dial signals, converting the corresponding dial signals into signals with different levels to control single and double channels and output digital quantity digits of the shaft angle conversion module, and generating a reference clock signal to control the output coding frequency of the CPLD;
the DC/DC module is used for converting an external input direct-current power supply into a direct-current power supply required by each hardware;
the DC/AC module is used for converting the direct current power supply converted by the DC/DC module into an alternating current power supply used by a rotary transformer;
an external input direct current power supply is respectively input into the two shaft angle conversion modules and the DC/AC module after the conversion of the DC/DC module, analog angle signals of the two rotary transformers are respectively input into the two shaft angle conversion modules, the two shaft angle conversion modules are respectively connected with the CPLD, the CPLD is connected with the DSP controller, the DSP controller is respectively connected with the shaft angle conversion modules, one output end of the DC/AC module is connected with the rotary transformers to output excitation power to the rotary transformers, and the other output end of the DC/AC module is connected with the shaft angle conversion modules.
The range of the external input direct-current power supply is + 18V- +28V, in the embodiment, the direct-current power supply input of +24VDC is selected, one DC/DC module can convert the externally input +24VDC direct-current power supply into +5VDC, +15VDC and-15 VDC, and the DC/AC module can convert the +15VDC and-15 VDC into 26VAC (2000Hz and 2600Hz) or 36VAC (2000 Hz).
In the shaft angle conversion module, an analog angle signal of the rotary transformer is converted into a 16-19 bit parallel digital quantity signal.
In the CPLD, the angle digital signals are encoded according to different use requirements of external output interfaces, so that the digital quantity signals are transmitted through each output interface of the DSP controller.
The DSP controller is provided with a plurality of output interfaces which are respectively a serial port, a network port and a CAN port, and the serial port is divided into an asynchronous serial port and a synchronous serial port.
The shaft angle digital conversion device also comprises a power input interface, and an external input direct current power supply is input into the DC/DC module through the power input interface.
The shaft angle digital conversion device also comprises a rotary transformer input interface, and an analog angle signal of the rotary transformer is input into the shaft angle conversion module through the rotary transformer input interface.
The angles of the two rotary transformers can be collected and coded simultaneously, and the angle value of only one rotary transformer can be collected.
The DSP controller is also provided with a hardware setting port, and the corresponding hardware bit is set through the hardware setting port, and the level of the hardware bit is increased to +5VDC, so that the single-double channel mode selection, the decoding output bit number selection and the communication baud rate selection of the shaft angle conversion module are realized.
The shaft angle digital conversion device also comprises a DSP controller, wherein the DSP controller and the CPLD are both provided with programming ports, and the DSP controller is connected with the CPLD through a digital interface.
Example two
As shown in fig. 1-3, this device adopts the modularization power conversion, the excitation power, shaft angle conversion module, DSP controller + CLPD combination realization function, whole modularization device is installed on printed circuit board, printed circuit board adopts the cold drawing design, directly dispel the heat with the device production heat through the cold drawing, avoid installing equipment such as fan, reduce cost and improvement reliability, printed circuit board installs in the metal seal box, the metal seal box adopts waterproof design, improve the outdoor service environment adaptability of this device, this device adopts the waterproof connector of aviation to the external interface, install outside the casing, directly adopt the connector plug to insert during the use.
The device mainly comprises two shaft angle conversion modules (comprising shaft angle conversion modules 1 and 2), a CPLD (complex programmable logic device), a DSP (digital signal processor) controller, a plurality of power conversion modules (comprising a DC/DC module 1 and DC/AC modules 1 and 2), a power input and programming connector 3, an input interface 4 of a rotary transformer 1, an input interface 5 of the rotary transformer 2, a shaft angle output interface 7 and a hardware setting port 6.
The system block diagram of the device in the single-path mode is shown in fig. 4, the device can also be expanded to two-path rotary transformer decoding, two-path rotary transformer input and output interfaces are reserved in a metal box, a printed circuit board and an external interface of the device, and each module chip can be installed according to the use requirement, so that the cost is saved. The system block diagram of the device in the two-way mode is shown in fig. 5, and two resolver angle values can be acquired simultaneously. The two rotary transformers can have different speed ratios and different excitation voltages, one rotary transformer can be a single-channel rotary transformer, the other rotary transformer can be a double-channel rotary transformer, and both the double-channel rotary transformer and the single-channel rotary transformer can be realized. And the dial control signal selects single/double channel rotary change and rotary speed ratio through the dial control signal, and collects the output angle digit.
As shown in fig. 4 and 5, the shaft angle conversion device is powered by a DC power supply, the DC power supply can range from DC +18V to DC +28V, the DC power supply is input into the device, in this embodiment, a +24VDC DC power supply is selected, and is converted into +5VDC, +15VDC, -15VDC required inside the shaft angle conversion module and AC power supplies 26VAC2000Hz and 36VAC2000Hz externally provided to the resolver through corresponding power conversion modules (DC/DC module 1 and DC/AC modules 1 and 2), the externally output DC/AC modules 1 and 2 provided to the resolver are in a modular design, and can be replaced according to the electrical characteristics of the resolver, so that the output AC power supply is changed into different excitation power supplies such as 26VAC2600Hz or 36VAC2000Hz to match different resolvers;
the DC +5V power supply generated in the DC/DC module 1 is provided for the corresponding shaft angle conversion module, the shaft angle conversion module is used for converting the collected analog angle signals of the rotary transformer into parallel digital quantity signals, and the parallel digital quantity signals can be set so as to be suitable for a single-channel rotary transformer or a double-channel rotary transformer, and the angle analog signals of the rotary transformer can be converted into 16-19-bit digital signals by setting the parallel digital quantity signals, wherein the 19-bit angle signals have the highest precision and can be selected according to the requirements of users;
the parallel digital signals output by the shaft angle conversion module are transmitted to the CPLD, serial data conversion, data stack storage and the like are carried out inside the CPLD, and angle digital signals are encoded through the CPLD, wherein the CPLD is a chip capable of being programmed on line, and different programs are written into the chip through programming software, so that the use requirements of different external output interfaces can be met; the DSP controller in the device can receive external dial signals, corresponding dial signals are converted into signals with different levels through programmed software to be used for controlling single and double channels of the shaft angle conversion module and outputting digital quantity digits, signals of the DSP controller can also generate reference clock signals to control the output coding frequency and other functions of the CPLD, and the DSP controller adopts online programming and can change the software according to use requirements to adapt to different user requirements;
according to the change of the use scene of a user, one shaft angle conversion chip (a shaft angle conversion module) or two shaft angle conversion chips can be arranged in the device, so that one rotary transformer or two rotary transformers can be connected; the device is integrally installed in a metal box, the metal box is designed in a sealing structure, the device is connected with a rotary transformer, is connected with an external power supply, is connected with an external output interface, and is completely provided with a waterproof connector when a programming interface is connected, so that the device has a rain-proof function when being used outdoors;
the device has wide adaptability and external interface characteristics of the rotary transformer, and can be used for raising the level of the rotary transformer to +5VDC according to different dial setting, adjusting single-channel and double-channel selection of a decoding chip of the rotary transformer, selecting the decoding output bit number, selecting the communication baud rate and setting the speed ratio of the rotary transformer, and sending related parameters to a DSP (digital signal processor) controller through a programming port by means of commands according to the electrical characteristics, decoding bit number requirements, communication baud rate requirements and the like of different rotary transformers, and setting the single-channel and double-channel settings of the rotary transformer, wherein the decoding bit number settings, the communication baud rate settings, the speed ratio settings, the single-channel and double-channel settings of the rotary transformer and the hardware settings have priority rights.
As shown in fig. 6, the software design of the device mainly includes two parts, namely a CPLD logic control part and a DSP control part, where the CPLD write software converts the parallel port data of the resolver decoded by the shaft angle conversion chip into serial digital signals, and transmits the serial data signals inside the CPLD through software to the synchronous serial port, asynchronous serial port, network port, CAN port bus programmed by the CPLD, and the clock signals generated by the DSP controller program, where the frequency of the clock signals is set by external hardware or software programming, and the transmission frequency of the CPLD to the external communication port CAN be controlled by setting different clock signal frequencies. The DSP controller is used for controlling the frequency, so that the CPLD generates transmission frequency which is in line with various external communication ports, and the system is convenient and flexible and has strong system expansibility.
The device has the following technical characteristics: the self-contained direct-alternating current conversion power supply provides an alternating current power supply for the rotary transformer, and rotary-transformer alternating current power supply equipment is not required, so that the equipment quantity is reduced, and the equipment reliability is improved; the alternating current power supply module of the device adopts a modular design, different alternating current power supply modules can be selected to adapt to different rotary transformers according to different rotary transformer requirements, and if two rotary transformers are connected, the two rotary transformers can adopt different voltage requirements; the device can set the transformation ratio of the rotary transformer through the dial switch, the dial switch is two 8-bit dial switches, each 8-bit dial switch corresponds to one path of rotary transformer setting function, the switch is switched on to output high voltage +5VDC, the switch is switched off to output low voltage 0VDC, the two 8-bit switches are respectively connected to the DSP digital interface, the speed ratio of the 0-2-bit control rotary transformer 1 is set corresponding to 0-15 bit of the DSP digital interface, the 000-bit control rotary transformer 1 has the speed ratio of 8, the 010-bit control rotary transformer has the speed ratio of 16, the 011-bit control rotary transformer has the speed ratio of 32, the 100-bit control rotary transformer has the speed ratio of 64, the 3-4-bit control rotary transformer 1 has the output bit number of 00, the 00-output angle is 16-bit, the 01-output angle is 17-bit, the 10-output angle is 18-bit, the 11-output angle is 19-bit, the 5-6-bit sets the asynchronous communication transmission baud rate, the 00-corresponding baud rate is 9600Kbs, the 01-corresponding baud rate is 19200Kbs, the 10 corresponding to the baud rate 38400Kbs, the 11 corresponding to the baud rate 115200Kbs, and the 7 th corresponding to the rotating single-channel rotary transformer are also double-channel rotary transformers, wherein 1 is a double-channel rotary transformer, and 0 is a single-channel rotary transformer; the other channel is set in the same way. The transformation ratio is from 1: 8 to 1: 64 can be changed according to the requirements of the rotary transformer, and the device can also select to be connected into a single-channel or double-channel rotary transformer through a dial switch; the device can simultaneously meet the simultaneous access decoding conversion of two rotary transformers through two shaft angle decoding modules, two decoding channels are mutually independent and work respectively, and decoded digital quantity angle signals are output externally through an external synchronous serial port, an asynchronous serial port, a network port and a can port; the external interface of the device adopts a synchronous serial port, an asynchronous serial port, a network port and a can port for external output, and the interfaces for external output are independent and do not influence each other, namely, the device can simultaneously meet the requirement that four upper controllers collect angle signals, meet the one-to-many function and improve the expansibility of product interfaces; furthermore, the Baud rates of the asynchronous communication port and the can port can be modified by writing the command through software programming, and the adaptability of the external interface is improved.
In summary, the flexible and expandable digital converter for axial angle of the two embodiments can be compatible with single-double channel rotary transformers and multiple rotary transformer transformation ratios; the analog signal of the rotary transformer CAN be converted into a digital signal, and the digital signal is transmitted out through a synchronous serial port, an asynchronous serial port, a network port and a CAN communication port and is provided for acquisition equipment; the excitation power supply required by different rotary transformers can be output, the problems of input signal compatibility and output interface compatibility are solved, the equipment cost is reduced, the debugging time is shortened, the system reliability is improved, and the excitation power supply is worthy of being popularized and used.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A flexible and expandable shaft angle digital conversion device is characterized in that: the device comprises at least two shaft angle conversion modules, a signal processing module, a microcontroller module, at least one DC/DC module and at least one DC/AC module;
the shaft angle conversion module is used for converting the analog angle signal of the rotary transformer into a parallel digital quantity signal;
the digital signal processing module is used for encoding and outputting the angle digital signals;
the microcontroller module is used for receiving external dial signals, converting the corresponding dial signals into signals with different levels to control single and double channels and output digital quantity digits of the shaft angle conversion module, and generating reference clock signals to control the output coding frequency of the CPLD;
the DC/DC module is used for converting an external input direct-current power supply into a direct-current power supply required by each hardware;
the DC/AC module is used for converting the direct current power supply converted by the DC/DC module into an alternating current power supply used by a rotary transformer;
the external input direct current power supply is respectively input into the two shaft angle conversion modules and the DC/AC module after the conversion of the DC/DC module, analog angle signals of the two rotary transformers are respectively input into the two shaft angle conversion modules, the two shaft angle conversion modules are respectively connected with the digital signal processing module, the digital signal processing module is connected with the microcontroller module, the DSP controller is respectively connected with the shaft angle conversion modules, one output end of the DC/AC module is connected with the rotary transformers to output excitation power supply to the rotary transformers, and the other output end of the DC/AC module is connected with the shaft angle conversion modules.
2. The flexible and expandable shaft angle digital conversion device according to claim 1, wherein: the digital signal processing module is a CPLD, and the microcontroller module is a DSP controller.
3. The flexible and expandable shaft angle digital conversion device according to claim 1, wherein: the range of the external input direct-current power supply is + 18V- +28V, the DC/DC module converts the external input direct-current power supply into +5VDC, +15VDC, -15VDC, and the DC/AC module converts the +15VDC, -15VDC into an excitation power supply of 26VAC or 36 VAC.
4. The flexible and expandable shaft angle digital conversion device according to claim 1, wherein: the shaft angle conversion module converts the analog angle signal of the rotary transformer into a 16-19 bit parallel digital quantity signal.
5. The flexible and expandable shaft angle digital conversion device according to claim 2, wherein: and the CPLD encodes the angle digital signal according to different use requirements of the external output interface.
6. The flexible and expandable shaft angle digital conversion device according to claim 2, wherein: the DSP controller is provided with a plurality of output interfaces which are respectively a serial port, a network port and a CAN port, and the serial port is divided into an asynchronous serial port and a synchronous serial port.
7. The flexible and expandable shaft angle digital conversion device according to claim 1, wherein: the shaft angle digital conversion device also comprises a power input interface and a rotary transformer input interface, wherein an external input direct current power supply is input into the DC/DC module through the power input interface, and an analog angle signal of each rotary transformer is respectively input into each shaft angle conversion module through the rotary transformer input interface.
8. The flexible and expandable shaft angle digital conversion device according to claim 1, wherein: and the two shaft angle conversion modules respectively and simultaneously acquire and encode the angles of the two rotary transformers.
9. The flexible and expandable shaft angle digital conversion device according to claim 1, wherein: and the two shaft angle conversion modules only acquire and encode the angle value of one rotary transformer.
10. The flexible and expandable shaft angle digital conversion device according to claim 2, wherein: the DSP controller is also provided with a hardware setting port, and the corresponding hardware bit is set through the hardware setting port, so that the level of the hardware bit is increased to +5VDC, and the working mode selection, the decoding output bit number selection and the communication baud rate selection of the shaft angle conversion module are realized.
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