CN212992302U - Digital source excitation device and rotary transformer device with excitation source - Google Patents
Digital source excitation device and rotary transformer device with excitation source Download PDFInfo
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- CN212992302U CN212992302U CN202021898715.0U CN202021898715U CN212992302U CN 212992302 U CN212992302 U CN 212992302U CN 202021898715 U CN202021898715 U CN 202021898715U CN 212992302 U CN212992302 U CN 212992302U
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Abstract
The utility model discloses a digital source excitation device and take rotatory potential device of excitation source, the device relate to the motor control field, and it includes: the digital control unit is used for generating a square wave control signal; the single band-pass filter is connected behind the digital control unit and is used for filtering the square wave control signal so as to reserve a sine wave signal or a cosine wave signal of a fundamental frequency component of the square wave control signal; and the post-stage power amplifier is connected behind the band-pass filter and used for amplifying the sine wave signal or the cosine wave signal output by the band-pass filter to obtain an excitation signal and outputting the excitation signal to the rotary transformer. The utility model discloses realize sine wave or sine wave excitation signal's production with simple mode, this digital source excitation device simple structure and low cost easily use on a large scale.
Description
Technical Field
The utility model relates to a motor control field specifically relates to a digital source excitation device and take rotatory potential device of excitation source.
Background
Resolvers are widely used in motor control applications and are the most common sensors used for motor position detection. The rotary transformer is used as a passive device, and needs to be added with an excitation power supply in use, wherein the excitation power supply is generally sine wave voltage with certain frequency and amplitude.
The existing soft decoding technology has the disadvantages of complex circuit and high cost in the way of obtaining the excitation power supply. For example, the prior art approach is typically implemented by converting a digital sine wave into an analog signal by a digital-to-analog converter (DAC). In patent CN 111193453 a, an implementation manner for generating an excitation signal by using the capability of a Programmable gate array module (FPGA) to process data in parallel is proposed, which requires the FPGA to have complex functions, inevitably increases the resource requirements of the FPGA, and has high cost and complex technical implementation; in patent CN104406515B, a technique of digital square wave is proposed, in which a processor sends out a square wave signal, and a post-stage filter circuit performs multi-stage filtering, so as to achieve the effect of digital excitation. However, the back-end multistage filter circuit adopts active filtering composed of a plurality of operational amplifiers, and has complex structure and low cost.
In view of the above, it is desirable to provide a digital source driver and a rotating transformer with a driver to solve the above-mentioned drawbacks.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above object, the utility model provides a digital source excitation device and take rotatory potential device of excitation source aims at solving the current rotatory potential device structure of taking the excitation source complicated and the cost subalternation problem.
In order to solve the above technical problem, the utility model provides a digital source excitation device, it includes, digital source excitation device includes: the digital control unit is used for generating a square wave control signal; the single band-pass filter is connected behind the digital control unit and used for filtering the square wave control signal so as to reserve a sine wave signal or a cosine wave signal of a fundamental frequency component of the square wave control signal; and the post-stage power amplifier is connected behind the band-pass filter and used for amplifying the sine wave signal or the cosine wave signal output by the band-pass filter to obtain an excitation signal and outputting the excitation signal to the rotary transformer.
In a further technical solution, the band pass filter is an active band pass filter.
In a further technical scheme, the active band-pass filter includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and an operational amplification unit, one end of the first resistor is connected to the output end of the digital control unit, the other end of the first resistor is connected to one end of the first capacitor, the other end of the first capacitor is connected to the output end of the operational amplification unit, one end of the second capacitor is connected between the first resistor and the first capacitor, the other end of the second capacitor is connected to one end of the third resistor, the other end of the third resistor is connected to the output end of the operational amplification unit, a signal input end of the operational amplification unit is connected between the second capacitor and the third resistor, the other signal input end is grounded, and a signal output end of the operational amplification unit is connected to the rear-stage power amplifier, one end of the second resistor is connected between the first resistor and the first capacitor, and the other end of the second resistor is grounded.
In a further technical solution, the operational amplification unit is an operational amplifier.
In a further technical solution, the capacitance values of the first capacitor and the second capacitor are the same.
In a further technical solution, the digital control unit is an oscillation circuit composed of a plurality of discrete devices.
In a further technical scheme, the digital control unit is a single chip microcomputer or a digital signal processor.
In a further technical scheme, the digital control unit is a programmable gate array module or a complex programmable logic device.
In a further technical scheme, the digital control unit comprises a timer and a digital quantity I/O template circuit or a universal pulse width modulation peripheral module, and the square wave control signal with preset frequency and preset amplitude is generated through the cooperation of the timer and the digital quantity I/O template circuit or through the pulse width modulation peripheral module.
In order to achieve the above object, the present invention further provides a rotary transformer device with an excitation source, which includes a rotary transformer and the above digital source excitation device, wherein the digital source excitation device is used as the excitation source of the rotary transformer.
Compared with the prior art, the utility model provides a digital source excitation device filters through single band pass filter to the produced control signal of digital control unit in order to reacing sine wave signal or cosine wave signal, and will sine wave signal or cosine wave signal amplify and export required excitation signal to rotary transformer through back level power amplifier, have simplified the realization that utilizes the ability of FPGA parallel processing data to produce the excitation signal among the prior art to and adopt the realization that contains the multistage active filter circuit that a plurality of operational amplifier constitute, this digital source excitation device simple structure and low cost, easily extensive use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are 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 any creative effort.
Fig. 1 is a block schematic diagram of a rotating transformer with an excitation source according to the present invention;
FIG. 2 is a block diagram of the digital source driver of the present invention;
fig. 3 is a schematic circuit diagram of an active band-pass filter in the digital source driver according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc. refer to directions of the attached drawings only. Accordingly, the directional terms used are used for describing and understanding the present invention, and are not used for limiting the present invention. Further, in the drawings, structures that are similar or identical are denoted by the same reference numerals.
Referring to fig. 1, an embodiment of a resolver 100 with an excitation source according to the present invention is shown, including a resolver 20 and a digital source excitation device 10, where the digital source excitation device 10 is used as the excitation source of the resolver 20. The digital source excitation device 10 of the present embodiment generates an excitation signal 16 to be output to the resolver 20 to obtain the rotor position. The specific structure and function of the digital source driver 10 will be described in detail below with reference to fig. 1 to 3.
Referring to fig. 1 to 2, the digital source driver 10 in the present embodiment includes: a digital control unit 11 for generating a square wave control signal 12; a single band-pass filter 13 connected to the back of the digital control unit 11 for filtering the square wave control signal 12 to retain a sine wave signal or a cosine wave signal 14 of the fundamental frequency component of the square wave control signal 12; and a post-stage power amplifier 15 connected to the band-pass filter 13 and amplifying the sine wave signal or the cosine wave signal 14 output from the band-pass filter to obtain an excitation signal 16, and outputting the excitation signal 16 to the resolver 20. In some embodiments, such as the present embodiment, referring to fig. 3, the band pass filter 13 is an active band pass filter 131 to automatically compensate for the changing harmonics, with high controllability and fast response.
Specifically, as can be known from the fourier series expansion of the square wave control signal 12, the time domain expression of the square wave control signal 12 generated by the digital control unit 11 is:
as can be seen from the fourier-decomposed time domain representation of the square-wave control signal 12, the square-wave control signal 12 is composed of odd-order harmonic components and dc components. Where the square wave fundamental frequency component is the desired signal for the excitation signal 16. With the above design, the square wave control signal 12 generated by the digital control unit 11 is filtered by the single band pass filter 13 to retain the sine wave signal or cosine wave signal 14 of the fundamental frequency component of the square wave control signal 12.
The sine wave signal or cosine wave signal 14 generated after being filtered by the active band pass filter 131 is amplified by the post-stage power amplifier 15, and an excitation signal 16 for the rotary transformer 20 is output. The utility model provides an among the technical scheme owing to need not to adopt the multistage active filter circuit that contains a plurality of operational amplifier and constitute to realize effectual filtering function, and it is not high to the device hardware requirement, this digital source excitation device 10 simple structure and low cost, easily extensive use.
In some embodiments, for example, in the present embodiment, as shown in fig. 3, the active band-pass filter 131 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, and an operational amplifier 132. In some embodiments, the operational amplifier unit 132 is an operational amplifier OP in the present embodiment. One end of the first resistor R1 is connected to the output end of the digital control unit 11, the other end of the first resistor R1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to the output end of the operational amplifier OP, one end of the second capacitor C2 is connected between the first resistor R1 and the first capacitor C1, the other end of the second capacitor C2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the output end of the operational amplifier OP, one signal input end of the operational amplifier OP is connected between the second capacitor C2 and the third resistor R3, the other signal input end is grounded, the signal output end of the operational amplifier OP is connected to the subsequent power amplifier 15, one end of the second resistor R2 is connected between the first resistor R1 and the first capacitor C1, and the other end of the second resistor R2 is grounded. The power supply of the operational amplifier OP may be a unipolar power supply or a bipolar power supply, and may be selected according to actual needs, and the selection of the positive input signal of the operational amplifier OP may be performed according to the power amplification needs of the subsequent driver circuit. If the power reference point can be selected as the positive input signal of the operational amplifier OP, the bias voltage can also be selected as the positive input signal of the operational amplifier OP, and based on the structural design, the use mode of the operational amplifier OP is more flexible.
Specifically, the transfer function of the circuit of the active band-pass filter 131 is:
to simplify the parameter setting, the capacitance values of the first capacitor C1 and the second capacitor C2 are taken to be the same, that is:
C1＝C2＝C
the bandwidth B of the band-pass filter, the center frequency point omega0And a gain KpThe expression of (a) is as follows:
according to the above formula, the bandwidth B is determined by the third resistor R3 and the capacitance C, and the value of the third resistor R3 and the capacitance C is adjusted to adjust the size of the bandwidth B, the center frequency point ω0The center frequency point ω is adjusted by adjusting the values of the first resistor R1, the second resistor R2, the third resistor R3, and the common capacitance C of the first capacitor C1 and the second capacitor C2, which are determined by the first resistor R1, the second resistor R2, the third resistor R3, and the capacitance C0Magnitude of (1), gain KpThe bandwidth B, the first resistor R1 and the capacitance C are determined together, i.e. K is adjusted by adjusting the values of the first resistor R1, the third resistor R3 and the capacitance CpThe size of (2). That is, the bandwidth B and the center frequency ω of the bandpass filter can be set by configuring the parameters of the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1 and the second capacitor C2 in the circuit0And gain KpAccording to the gain K of the band-pass filter setpBandwidth B and center frequency point omega0To filter out harmonics of undesired frequency bands to obtain a desired sine wave signal or cosine wave signal. Based on the design of the structure, based on the dispersion of the frequency spectrum components of the time domain expression of the square wave control signal 12 after Fourier expansion, the sine wave signal or the cosine wave signal 14 of the fundamental frequency component is screened out through the band-pass filter with specific center frequency and bandwidth, and the execution efficiency is improved.
In some embodiments, such as the present embodiment, the digital control unit 11 is an oscillating circuit composed of a plurality of discrete devices. Specifically, the digital control unit 11 is constituted by an oscillation circuit composed of a plurality of discrete devices such as a resistor, a capacitor, an operational amplifier, and the like, which generates the square wave control signal 12. Based on the design of the structure, the digital control unit 11 for generating the square wave control signal 12 has a simple structure and reduces the production cost.
In some embodiments, for example, in this embodiment, the Digital control unit 11 is an integrated circuit having an integrated control function, such as a single chip or a Digital Signal Processor (DSP). In another embodiment, the digital control unit 11 is an integrated circuit with integrated control function, such as a Programmable Gate Array (FPGA) or a Complex Programmable Logic Device (CPLD), which can change hardware parameters by modifying a software program. Different types of digital control units 11 can be selected according to different use requirements, and application scenes are wider. Specifically, the digital control unit 11 such as the single chip microcomputer, the digital signal processor, the programmable gate array module or the complex programmable logic device includes a timer and a digital I/O template circuit or a Pulse Width Modulation (PWM) peripheral module, and generates a square wave control signal 12 with a preset frequency and a preset amplitude through the cooperation of the timer and the digital I/O template circuit or through the PWM peripheral module. Based on the above-mentioned design, the preset frequency and the preset amplitude of the square wave control signal 12 generated by the digital control unit 11 can be selected according to the parameters of the resolver 20 to be excited at the rear end of the excitation signal 16, wherein the preset frequency depends on the excitation frequency required by the resolver 20.
Compared with the prior art, the utility model provides a digital source excitation device 10, through single band pass filter 13 to the produced square wave control signal 12 of digital control unit 11 filter in order to reacing sine wave signal or cosine wave signal 14, and amplify sine wave signal or cosine wave signal 14 through back level power amplifier 15 and export required excitation signal 16 to rotary transformer 20, the realization that utilizes the ability of FPGA parallel processing data to produce excitation signal among the prior art has been simplified, and the realization that adopts the multistage active filter circuit that contains a plurality of operational amplifier constitution, this digital source excitation device 10 simple structure and low cost, easily extensive use.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A digital source driver for use as a driving source of a resolver, the digital source driver comprising:
the digital control unit is used for generating a square wave control signal;
the single band-pass filter is connected behind the digital control unit and used for filtering the square wave control signal so as to reserve a sine wave signal or a cosine wave signal of a fundamental frequency component of the square wave control signal; and
and the rear-stage power amplifier is connected behind the band-pass filter and used for amplifying the sine wave signal or the cosine wave signal output by the band-pass filter to obtain an excitation signal and outputting the excitation signal to the rotary transformer.
2. The digital source driver of claim 1, wherein: the band-pass filter is an active band-pass filter.
3. The digital source driver of claim 2, wherein: the active band-pass filter comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and an operational amplification unit, wherein one end of the first resistor is connected with the output end of the digital control unit, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is connected to the output end of the operational amplification unit, one end of the second capacitor is connected between the first resistor and the first capacitor, the other end of the second capacitor is connected with one end of the third resistor, the other end of the third resistor is connected to the output end of the operational amplification unit, a signal input end of the operational amplification unit is connected between the second capacitor and the third resistor, the other signal input end of the operational amplification unit is grounded, and the signal output end of the operational amplification unit is connected to the rear-stage power amplifier, one end of the second resistor is connected between the first resistor and the first capacitor, and the other end of the second resistor is grounded.
4. The digital source driver of claim 3, wherein: the operational amplification unit is an operational amplifier.
5. The digital source driver of claim 3, wherein: the capacitance value of the first capacitor is the same as that of the second capacitor.
6. The digital source driver of claim 2, wherein: the digital control unit is an oscillating circuit composed of a plurality of discrete devices.
7. The digital source driver of claim 2, wherein: the digital control unit is a singlechip or a digital signal processor.
8. The digital source driver of claim 2, wherein: the digital control unit is a programmable gate array module or a complex programmable logic device.
9. The digital source driver apparatus of claim 7 or 8, wherein: the digital control unit comprises a timer and a digital quantity I/O template circuit or a pulse width modulation peripheral module, and the square wave control signal with preset frequency and preset amplitude is generated through the cooperation of the timer and the digital quantity I/O template circuit or through the pulse width modulation peripheral module.
10. A rotary transformer with an excitation source is characterized in that: comprising a resolver and a digital source excitation device according to any of claims 1-9, for acting as an excitation source for the resolver.
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| CN202021898715.0U CN212992302U (en) | 2020-09-02 | 2020-09-02 | Digital source excitation device and rotary transformer device with excitation source |
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| CN202021898715.0U CN212992302U (en) | 2020-09-02 | 2020-09-02 | Digital source excitation device and rotary transformer device with excitation source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113467312A (en) * | 2021-07-08 | 2021-10-01 | 中车株洲电机有限公司 | Device for generating excitation signal of rotary transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113467312A (en) * | 2021-07-08 | 2021-10-01 | 中车株洲电机有限公司 | Device for generating excitation signal of rotary transformer |
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