CN213637685U - Ultrahigh harmonic wave filtering device - Google Patents
Ultrahigh harmonic wave filtering device Download PDFInfo
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- CN213637685U CN213637685U CN202022423803.1U CN202022423803U CN213637685U CN 213637685 U CN213637685 U CN 213637685U CN 202022423803 U CN202022423803 U CN 202022423803U CN 213637685 U CN213637685 U CN 213637685U
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Abstract
The utility model discloses an ultra-high subharmonic filtering device, include: the high-pass filter is used for acquiring a sampling signal and filtering harmonic waves which are contained in the sampling signal and are lower than a preset frequency to obtain an analog signal after high-pass filtering, and the harmonic waves which are lower than the preset frequency are low-frequency harmonic signals including fundamental wave signals; and the program-controlled amplification filter is connected with the high-pass filter and used for setting control parameters according to preset parameters, and sequentially amplifying and low-pass filtering the analog signals subjected to high-pass filtering to obtain analog signals subjected to low-pass filtering, so that the flexibility of the ultrahigh-order harmonic filtering device is enhanced, and the ultrahigh-order harmonic filtering device can adapt to various signal processing working conditions.
Description
Technical Field
The utility model relates to a signal processing field, concretely relates to super high subharmonic filter device.
Background
With the vigorous development of new energy power generation and the more and more novel electric equipment based on the power electronic conversion technology is connected into the power grid, a large amount of ultrahigh harmonics can be injected into the power grid. In practical applications, the electromagnetic compatibility problem caused thereby is also more serious. In practical engineering application, the requirements of the measurement frequency bands of the ultra-high harmonics are different, the harmonic frequencies to be analyzed are different in the ultra-high harmonic measurement device which meets IEC standard IEC 61000-4-30:2015 and has the same ultra-high harmonic definition frequency band, in order to increase the adaptability of the front-end analog signal conditioning circuit to the rear-end ADC and signal processing, a plurality of groups of filters are often designed in practical design, and a certain filter is selected to form the front-end analog signal conditioning circuit through software control in the test process. The disadvantages of implementing a front-end analog signal conditioning circuit by a filter bank are mainly two: firstly, the cost is high, a filter bank is often composed of a plurality of filters, and redundancy is excessive during repeated circuit building and use; secondly, the filter bank is not flexible in use, and more filters forming the filter bank are used more flexibly, but occupy more volume.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the super high order harmonic filter device among the prior art can not be applicable to in a flexible way among the multiple harmonic measuring device to a super high order harmonic filter device is provided.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the embodiment of the utility model provides an ultrahigh subharmonic filtering device, include: the high-pass filter is used for acquiring a sampling signal and filtering harmonic waves which are contained in the sampling signal and are lower than a preset frequency to obtain a high-pass filtered analog signal, and the harmonic waves which are lower than the preset frequency are low-frequency harmonic signals including fundamental wave signals; and the program-controlled amplification filter is connected with the high-pass filter and used for setting control parameters according to preset parameters and sequentially amplifying and low-pass filtering the analog signals subjected to high-pass filtering to obtain analog signals subjected to low-pass filtering.
In one embodiment, the ultra-high order harmonic filtering apparatus further includes: the user input module is respectively connected with the program-controlled amplification filter, and a user inputs preset parameters into the program-controlled amplification filter through the user input module, wherein the preset parameters comprise: the preset amplification gain and the preset cut-off frequency.
In one embodiment, the programmable amplification filter comprises: the programmable gain amplifier is connected with the high-pass filter and is used for setting gain parameters according to preset amplification gain and amplifying the analog signal after high-pass filtering; and the program-controlled low-pass filter is connected with the program-controlled gain amplifier and is used for setting a bandwidth parameter according to a preset cut-off frequency and carrying out low-pass filtering on the amplified signal to obtain a low-pass filtered analog signal.
In one embodiment, the programmable gain amplifier and the programmable low-pass filter are integrated in the same single chip.
In one embodiment, the ultra-high order harmonic filtering apparatus further includes: and the power supply circuit is respectively connected with the high-pass filter and the program-controlled amplification filter and is used for supplying power to the high-pass filter and the program-controlled amplification filter.
In one embodiment, the ultra-high order harmonic filtering apparatus further includes: and the latch circuit is respectively connected with the user input module and the program control amplifying filter and is used for storing preset parameters input by a user.
In one embodiment, the ultra-high order harmonic filtering apparatus further includes: and each bandwidth control IO line and each gain control IO line are respectively connected with the user input module and the single chip or respectively connected with the user input module and the latch circuit.
The utility model discloses technical scheme has following advantage:
1. the utility model provides an ultra-high subharmonic filter device, high pass filter in with the sampling signal low frequency harmonic signal filtering including fundamental wave signal after, programme-controlled amplification filter sets up control parameter according to presetting the parameter to analog signal after the high pass filter enlargies and low pass filtering, thereby has strengthened ultra-high subharmonic filter device's flexibility, makes it can be adapted to in various signal processing and measuring operating mode.
2. The utility model provides an ultra-high subharmonic filtering device, the user passes through user input module real-time independent adjustment program-controlled gain amplifier and program-controlled low pass filter's control parameter, and then realizes the anti-aliasing filter circuit's of signal processing device front end design with lower cost and higher performance.
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 embodiments or the technical solutions in the prior art will be briefly described 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 composition diagram of a specific example of an ultra-high harmonic filtering apparatus according to an embodiment of the present invention;
fig. 2 is a composition diagram of another specific example of an ultra-high harmonic filtering apparatus according to an embodiment of the present invention;
fig. 3 is a composition diagram of another specific example of the ultra-high harmonic filtering apparatus according to the embodiment of the present invention;
fig. 4 is a composition diagram of another specific example of the ultra-high harmonic filtering apparatus according to the embodiment of the present invention;
fig. 5 is a composition diagram of another specific example of the ultra-high harmonic filtering apparatus according to the embodiment of the present invention;
fig. 6(a) is a composition diagram of another specific example of the ultra-high order harmonic filtering apparatus according to the embodiment of the present invention;
fig. 6(b) is a composition diagram of another specific example of the ultra-high order harmonic filtering apparatus according to the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all 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 description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Examples
The embodiment of the utility model provides an ultrahigh subharmonic filter device is applied to the occasion that needs measure multiband harmonic, as shown in figure 1, include: a high-pass filter 1 and a program-controlled amplifying filter 2.
The utility model discloses high pass filter 1 is used for acquireing sampled signal to its harmonic that contains is less than preset frequency of filtering obtains the analog signal after the high pass filter, and the harmonic that is less than preset frequency is the low frequency harmonic signal including containing the fundamental wave signal. The utility model discloses high pass filter 1 of embodiment is fixed bandwidth, and fixed order's simulation high pass filter 1 specifically, and it can comprise electric capacity, inductance, resistance and operational amplifier, and it is more ripe wave filter among the prior art, so no longer give consideration to repeatedly.
The embodiment of the utility model provides a high pass filter keeps super high order harmonic signal with the whole filtering of the low frequency harmonic signal including the fundamental wave in the sampling signal, for example can keep 9kHz ~ 150kHz harmonic, and this point is used for the example only, but does not use this as the restriction.
As shown in fig. 1, the utility model discloses programme-controlled amplification filter 2 is connected with high pass filter 1 for according to presetting parameter setting control parameter, and amplify and low pass filtering in proper order the analog signal after the high pass filtering handles, obtains the analog signal after the low pass filtering.
The utility model discloses super high-order harmonic filter specifically is analog signal adjusting circuit, can be connected with devices such as signal measurement, harmonic detection after that, for example: and then the ultrahigh harmonic filter device can be connected with an analog-to-digital converter, a digital signal processing circuit and the like in sequence, so that the ultrahigh harmonic filter device provided by the embodiment of the utility model is suitable for devices such as multiple signal measurement and harmonic detection which are connected with the ultrahigh harmonic filter device, the embodiment of the utility model integrates the program control amplifying filter 2 into a single chip, and the control parameters (such as gain parameters and cut-off frequency parameters and the like) can be programmed and set according to the actual situation, thereby reducing the volume of the ultrahigh harmonic filter device and improving the use flexibility.
When analyzing super high order harmonic, because the harmonic number that the analysis corresponds at every turn is different, consequently the embodiment of the utility model provides an in programme-controlled amplification filter can carry out low pass filtering to the super high order harmonic of high pass filter output once more through setting up different gain, cut-off frequency, remain the harmonic signal that needs the analysis, in addition, the utility model discloses a programme-controlled amplification filter 2 is continuous amplification filter, and the user can be through its control parameter of real time control to obtain continuous different multiples, the signal of different frequency.
The embodiment of the utility model provides an in provide an ultra high subharmonic filter, high pass filter remain ultra high subharmonic after with the low frequency harmonic signal filtering including the fundamental wave signal in the sampled signal, programme-controlled amplification filter sets up control parameter according to presetting the parameter to analog signal after the high pass filter enlargies and low pass filtering, thereby has strengthened ultra high subharmonic filter's flexibility, makes it can be adapted to in various signal processing and the measuring operating mode.
In one embodiment, as shown in fig. 2, the ultra-high harmonic filtering apparatus further includes: the user input module 3 is respectively connected with the program control amplification filter 2, and a user inputs preset parameters into the program control amplification filter 2 through the user input module 3, wherein the preset parameters comprise: the preset amplification gain and the preset cut-off frequency.
The utility model discloses user input module 3 can be for display screen, key input etc. and the user can be according to actual conditions, will predetermine the parameter input to programme-controlled amplification filter 2 in through this module to control programme-controlled amplification filter 2 and enlarge corresponding multiple to the signal after the high pass filter, and the harmonic of its corresponding frequency of filtering.
In one embodiment, as shown in fig. 3, the programmable amplification filter 2 comprises: a programmable gain amplifier 21 and a programmable low pass filter 22.
As shown in fig. 3 and fig. 4, a programmable gain amplifier 21(PGA) according to an embodiment of the present invention is connected to the high pass filter 1(HPF) for setting a gain parameter according to a preset amplification gain and amplifying the analog signal after high pass filtering;
and the program-controlled low-pass filter 22(PLPF) is connected to the program-controlled gain amplifier 21(PGA) and configured to set a bandwidth parameter according to a preset cut-off frequency and perform low-pass filtering on the amplified signal to obtain a low-pass filtered analog signal.
The utility model discloses programme-controlled gain amplifier 21 and programme-controlled low pass filter 22 integrate in same single-chip, and the input signal of this single-chip is the analog quantity, and its output signal is the analog quantity equally, and in order to make programme-controlled amplification filter 2's control parameter controllable, consequently the embodiment of the utility model discloses adopt the LTC1564 chip to construct control parameter (can be bandwidth and gain) real-time controllable programme-controlled amplification filter 2, control parameter is for being able to programme.
The LTC1564 chip is a new class of continuous time filters suitable for anti-aliasing, reconstruction, and other band-limiting applications, and does not require other analog components or filter expertise to use the device. The LTC1564 chip has an analog input pin connected to the high-pass filter 1 and an analog output pin outputting a low-pass filtered analog signal.
It should be noted that the utility model discloses control method etc. that relate among the programme-controlled amplification filter based on single-chip are the mature control method of prior art, no longer describe here, and the utility model discloses the single-chip is not only limited to LTC1564 chip, still can be for other chips that have the same function.
In one embodiment, as shown in fig. 5, the ultra-high harmonic filtering apparatus further includes:
and the power supply circuit 4 is respectively connected with the high-pass filter 1 and the program-controlled amplification filter 2 and is used for supplying power to the high-pass filter 1 and the program-controlled amplification filter 2.
In a specific embodiment, as shown in fig. 6, the ultra-high harmonic filtering apparatus further includes:
and the latch circuit 5 is respectively connected with the user input module 3 and the program-controlled amplification filter 2 and is used for storing the preset amplification gain and the preset cut-off frequency input by the user.
In one embodiment, as shown by the thick lines in fig. 6(a) and 6(b), the ultra-high order harmonic filtering apparatus further includes: a plurality of bandwidth control IO lines and a plurality of gain control IO lines.
As shown by the thick line in fig. 6(b), each bandwidth control IO line and each gain control IO line of the embodiment of the present invention are respectively connected to the user input module 3 and directly connected to the single chip (program control amplification filter 2); or, as shown by the thick line in fig. 6(a), each bandwidth control IO line and each gain control IO line are respectively connected to the user input module 3, and are connected to the single chip (program-controlled amplification filter 2) through the latch circuit 5.
In FIG. 6(a) and FIG. 6(b), the number of the gain control IO lines is 4 (G3: 0), which can realize 16 gain control states (as shown in Table 1), and which supports LTTL and CMOS level standards, G3 is the highest control bit, and G0 is the lowest control bit. The bandwidth control IO lines are 4 (F3: 0), which can achieve 16 bandwidth control states (as shown in Table 2), and which support LTTL and CMOS level standards, F3 being the highest control bit and F0 being the lowest control bit. However, the number of the gain control IO lines and the bandwidth control IO lines in fig. 6 is not limited to 4, and the specific number is configured according to the actual situation and the single-chip data parameters.
TABLE 1
TABLE 2
The embodiment of the utility model provides an ultra-high harmonic filter device, high pass filter in with the sampling signal low frequency harmonic signal filtering including fundamental wave signal after, programme-controlled amplification filter sets up control parameter according to preset parameter to analog signal after the high pass filter amplifies and low pass filter, thereby has strengthened ultra-high harmonic filter device's flexibility, makes it can adapt to in various signal processing and measuring operating modes; a user independently adjusts the control parameters of the program-controlled gain amplifier and the program-controlled low-pass filter in real time through the user input module, and then the design of the anti-aliasing filter circuit at the front end of the signal processing device is realized with lower cost and higher performance.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (6)
1. An ultra-high order harmonic filtering device, comprising: a high-pass filter, a programmable amplification filter, wherein,
the high-pass filter is used for acquiring a sampling signal, filtering out harmonic waves which are contained in the sampling signal and are lower than a preset frequency to obtain a high-pass filtered analog signal, wherein the harmonic waves which are lower than the preset frequency are low-frequency harmonic signals including fundamental wave signals;
the program-controlled amplification filter is connected with the high-pass filter and used for setting control parameters according to preset parameters and sequentially amplifying and low-pass filtering the analog signals subjected to high-pass filtering to obtain analog signals subjected to low-pass filtering;
the programmable amplification filter comprises: a programmable gain amplifier and a programmable low-pass filter;
the programmable gain amplifier and the programmable low-pass filter are integrated in the same single chip.
2. The ultra-high order harmonic filtering device according to claim 1, further comprising:
the user input module is respectively connected with the program-controlled amplification filter, and a user inputs preset parameters into the program-controlled amplification filter through the user input module, wherein the preset parameters comprise: the preset amplification gain and the preset cut-off frequency.
3. The ultra-high order harmonic filtering device according to claim 2,
the program control gain amplifier is connected with the high-pass filter and used for setting gain parameters according to preset amplification gain and amplifying the analog signals subjected to high-pass filtering;
and the program-controlled low-pass filter is connected with the program-controlled gain amplifier and is used for setting a bandwidth parameter according to a preset cut-off frequency and carrying out low-pass filtering on the amplified signal to obtain a low-pass filtered analog signal.
4. The ultra-high order harmonic filtering device according to claim 1, further comprising:
and the power supply circuit is respectively connected with the high-pass filter and the program-controlled amplification filter and is used for supplying power to the high-pass filter and the program-controlled amplification filter.
5. The ultra-high order harmonic filtering device according to claim 2, further comprising:
and the latch circuit is respectively connected with the user input module and the program control amplifying filter and is used for storing preset parameters input by a user.
6. The ultra-high order harmonic filtering device according to claim 1, further comprising: a plurality of bandwidth control IO lines and a plurality of gain control IO lines, wherein,
each bandwidth control IO line and each gain control IO line are respectively connected with the user input module and the single chip, or respectively connected with the user input module and the latch circuit.
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| CN202022423803.1U CN213637685U (en) | 2020-10-27 | 2020-10-27 | Ultrahigh harmonic wave filtering device |
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| CN202022423803.1U CN213637685U (en) | 2020-10-27 | 2020-10-27 | Ultrahigh harmonic wave filtering device |
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