CN212163298U - Isolated square wave frequency reduction circuit - Google Patents
Isolated square wave frequency reduction circuit Download PDFInfo
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- CN212163298U CN212163298U CN202021089582.2U CN202021089582U CN212163298U CN 212163298 U CN212163298 U CN 212163298U CN 202021089582 U CN202021089582 U CN 202021089582U CN 212163298 U CN212163298 U CN 212163298U
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Abstract
The utility model discloses an isolated square wave frequency reduction circuit, which comprises an isolation chip, wherein the isolation chip comprises an input end, an output end and an isolation power supply end, and is provided with a high level threshold value; the square wave signals are connected into an isolation chip through the input end, and the isolation chip filters effective square wave signals by using the high level threshold value; the isolation power end is connected with an isolation power supply, the isolation chip isolates the amplitude of the filtered square wave signal by using the voltage value of the isolation power supply, and the isolated square wave signal is output through the output end; and the frequency reduction chip is connected with the output end of the isolation chip and converts the isolated square wave signals into low-frequency square wave signals with the frequency lower than that of the square wave signals according to the number of counting pulses. The utility model discloses isolated form square wave frequency reduction circuit, conversion square wave signal are low frequency square wave signal, and circuit structure is simple, and the operation low power dissipation.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to isolated form square wave frequency reduction circuit.
Background
In the measurement field, a plurality of sensors (a torque sensor, a pressure sensor, a temperature sensor, a concentration sensor and the like) or equipment output square wave signals, the change of physical quantity is reflected through the change of frequency, and a measuring instrument is used for measuring the square wave frequency and analyzing the actual physical quantity. At present, most low-end measuring instruments (such as multimeters, collectors, frequency meters and the like) have low sampling speed and cannot accurately measure high-frequency square wave signals, therefore, a square wave frequency-reducing circuit is needed to reduce the frequency of the high-frequency square wave signals, for example, 100Hz square wave signals are output, 10Hz signals are obtained after frequency reduction, and after frequency reduction conversion, the low-speed measuring instrument can also be used for measuring high-speed signals without purchasing high-speed measuring instruments at high cost.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide an isolated form square wave frequency reduction circuit, conversion square wave signal are low frequency square wave signal, circuit structure is simple, and the operation low power dissipation.
In order to solve the above technical problem, the present invention provides an isolated square wave down converter circuit, which comprises,
the isolation chip comprises an input end, an output end and an isolation power supply end, and is provided with a high level threshold value; the square wave signals are connected into an isolation chip through the input end, and the isolation chip filters effective square wave signals by using the high level threshold value; the isolation power end is connected with an isolation power supply, the isolation chip isolates the amplitude of the filtered square wave signal by using the voltage value of the isolation power supply, and the isolated square wave signal is output through the output end;
and the frequency reduction chip is connected with the output end of the isolation chip and converts the isolated square wave signals into low-frequency square wave signals with the frequency lower than that of the square wave signals according to the number of counting pulses.
In a preferred embodiment of the present invention, the isolation chip further comprises a high level threshold of 2 VDC.
In a preferred embodiment of the present invention, the isolation power supply is a 3.3V dc power supply.
The present invention provides a preferred embodiment, further comprising the isolation chip further comprises a primary power source end, the primary power source end is connected to a primary power source, and the primary power source is a 5V dc power source.
In a preferred embodiment of the present invention, the primary power source is generated by a primary power chip, and the model of the primary power chip is LM 7805.
In a preferred embodiment of the present invention, the isolation chip further includes one of the types of admm 1400, admm 1401, and admm 1402.
In a preferred embodiment of the present invention, the down-conversion chip is EP4CE6E22C 8N.
The present invention further comprises a memory, wherein the memory is used for storing the frequency reduction multiple of the square wave signal and the frequency reduction chip running program.
The utility model has the advantages that:
the isolated square wave frequency reduction circuit of the utility model converts the input square wave signal into the low-frequency square wave signal, and solves the problem that the current low-speed measuring instrument can not measure the frequency of the high-speed square wave signal; meanwhile, noise interference of the square wave signal is filtered before down conversion, so that the frequency calculation accuracy of frequency conversion can be effectively improved; on the other hand, the input signal and the output signal of the isolation chip are completely isolated, the quality of the low-frequency square wave signal is effectively improved, the circuit structure is simple, and the operation power consumption is low.
Drawings
Fig. 1 is a structural diagram of an isolated square wave down converter circuit according to a preferred embodiment of the present invention.
The reference numbers in the figures illustrate:
u1: isolating the chip;
u2: a frequency reduction chip;
u3: a primary power supply chip;
u4: a memory.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Examples
The embodiment discloses an isolated square wave frequency reducing circuit, which comprises an isolation chip U1 and a frequency reducing chip U2, wherein a square wave signal to be subjected to frequency reduction is connected to the isolation chip U1, the isolation chip U1 isolates an input signal from an output signal, the input square wave signal is subjected to filtering and noise reduction, and the square wave signal subjected to the isolation and noise reduction is connected to a frequency reducing chip U2, as shown in fig. 1.
Specifically, the isolation chip U1 includes an input terminal VI, an output terminal VO, a primary power terminal VDD1, and an isolation power terminal VDD 2. The primary power source terminal VDD1 is connected to a primary power source generated by the primary power source chip U3. In the technical scheme of this embodiment, the primary power supply is a 5V dc power supply, and can be compatible with a 5V or 3.3V square wave signal output by a sensor or a device. Specifically, the primary power chip U3 may be a power chip of the type LM 7805.
The isolation chip U1 is provided with a high level threshold value; the square wave signal is connected to the isolation chip U1 through the input terminal VI, and the isolation chip U1 filters out a valid square wave signal by using the high level threshold. As a preferred technical solution of this embodiment, the high level threshold of the isolation chip U1 is 2VDC, and when the square wave signal connected to the input terminal VI is lower than 2V, the signal is identified as a low level signal, and conversely, when the square wave signal is equal to or higher than 2V, the signal is identified as a high level signal. The high level signal is passed to the subsequent stage, while the low level signal is filtered and not passed to the subsequent stage. The isolation chip U1 filters the noise interference of the square wave signal by setting a high level threshold value, plays a role in filtering and reducing noise, and improves the frequency calculation precision of the frequency reduction chip.
The isolation power supply terminal VDD2 is connected to an isolation power supply, the isolation chip U1 isolates the amplitude of the filtered square wave signal using the voltage value of the isolation power supply, and the isolated square wave signal is output through the output terminal VO.
The isolation chip U1 plays three roles:
in a first aspect: filtering and noise reduction are carried out, pure square waves are output, the misjudgment rate is reduced, and the implementation process is the same as that described above.
In a second aspect: the voltage amplitude of the square wave signal after filtering processing is adjusted: the voltage amplitude of the signal output by the isolation chip U1 only depends on the voltage value of the power supply accessed by the isolation power supply terminal VDD2, for example, when the isolation power supply terminal is accessed with 5V voltage, the isolation chip outputs a square wave signal with amplitude of 5V; when the isolation power supply is connected with 3.3V voltage, the isolation chip outputs a square wave signal with the amplitude of 3.3V. Thereby playing the role of adjusting the amplitude of the square wave signal after filtering.
In a third aspect: the functions of input and output isolation and smoothing of the square wave signals are achieved, and the quality of the square wave signals connected to the frequency reduction chip U2 is improved. Through input and output complete isolation, the amplitude of the square wave signal output by the isolation chip U1 completely depends on the power supply voltage accessed by the isolation power supply end, and the problem that the rear-end equipment is affected due to oscillation in the output process of the front-end equipment is avoided.
In a preferred technical solution of this embodiment, the isolation power supply is a 3.3V dc power supply, and can be directly matched with the down-conversion chip U2.
In the technical solution of this embodiment, the type of the above-mentioned isolation chip is one of admm 1400, admm 1401, and admm 1402.
The high-quality high-frequency square wave signal output by the isolation chip U1 is connected to the down chip U2, and the down chip U2 converts the isolated square wave signal into a low-frequency square wave signal with the frequency lower than that of the square wave signal according to the number of counting pulses. Here, the down chip U2 has a counter integrated therein, and the down factor is determined according to the number of pulses counted by the counter. For example, one count pulse, down-doubled; two counting pulses, down four times. Corresponding to the input square wave signal of 100Hz, the frequency is respectively reduced to 50Hz and 25 Hz. In one implementation of this embodiment, the down-conversion chip U2 may be an EP4CE6E22C8N chip.
The frequency conversion device also comprises a memory U4, wherein the memory is used for storing the frequency conversion multiple of the square wave signal and a basic program operated by the frequency conversion chip U2, and the frequency conversion multiple can be loaded in the operating program. The memory U4 may be an EPCS16 chip, and the down chip U2 loads logic data from the memory U4 each time the square wave down circuit is powered on.
The present embodiment needs to be supplemented with: the square wave frequency reducing circuit comprises a specific hardware structure such as an isolation chip, a frequency reducing chip, a power supply chip and the like, wherein part of hardware participates in the operation process of a software program, and the software programs assisting the operation of the square wave frequency reducing circuit are all existing reproducible software programs, so that the innovation point of the application is not formed.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (8)
1. An isolated square wave frequency reducing circuit is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the isolation chip comprises an input end, an output end and an isolation power supply end, and is provided with a high level threshold value; the square wave signals are connected into an isolation chip through the input end, and the isolation chip filters effective square wave signals by using the high level threshold value; the isolation power end is connected with an isolation power supply, the isolation chip isolates the amplitude of the filtered square wave signal by using the voltage value of the isolation power supply, and the isolated square wave signal is output through the output end;
and the frequency reduction chip is connected with the output end of the isolation chip and converts the isolated square wave signals into low-frequency square wave signals with the frequency lower than that of the square wave signals according to the number of counting pulses.
2. The isolated square wave down conversion circuit of claim 1, wherein: the high level threshold of the isolation chip is 2 VDC.
3. The isolated square wave down conversion circuit of claim 1, wherein: the isolation power supply is a 3.3V direct current power supply.
4. The isolated square wave down conversion circuit of claim 1, wherein: the isolation chip further comprises a primary power end, the primary power end is connected with a primary power supply, and the primary power supply is a 5V direct current power supply.
5. The isolated square wave down conversion circuit of claim 4, wherein: the primary power supply is generated by a primary power supply chip, and the model of the primary power supply chip is LM 7805.
6. The isolated square wave down conversion circuit of claim 1, wherein: the type of the isolation chip is one of ADUM1400, ADUM1401 and ADUM 1402.
7. The isolated square wave down conversion circuit of claim 1, wherein: the model of the frequency reduction chip is EP4CE6E22C 8N.
8. The isolated square wave frequency reducing circuit according to any one of claims 1 to 7, wherein: the frequency reduction chip further comprises a memory, wherein the memory is used for storing the frequency reduction multiple of the square wave signal and the frequency reduction chip operation program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021089582.2U CN212163298U (en) | 2020-06-12 | 2020-06-12 | Isolated square wave frequency reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021089582.2U CN212163298U (en) | 2020-06-12 | 2020-06-12 | Isolated square wave frequency reduction circuit |
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| Publication Number | Publication Date |
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| CN212163298U true CN212163298U (en) | 2020-12-15 |
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| CN202021089582.2U Active CN212163298U (en) | 2020-06-12 | 2020-06-12 | Isolated square wave frequency reduction circuit |
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