CN112394218A - Signal measurement circuit and optical module suitable for same - Google Patents
Signal measurement circuit and optical module suitable for same Download PDFInfo
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- CN112394218A CN112394218A CN201910757323.8A CN201910757323A CN112394218A CN 112394218 A CN112394218 A CN 112394218A CN 201910757323 A CN201910757323 A CN 201910757323A CN 112394218 A CN112394218 A CN 112394218A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 title claims description 13
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 11
- 230000003321 amplification Effects 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
The invention discloses a signal measuring circuit and an optical module suitable for the same, wherein the signal measuring circuit comprises a direct current filter and an alternating current filter, a first direct current signal and a first alternating current signal in a flashing signal are independently output and are independently amplified by a first signal amplifier and a second signal amplifier respectively, so that an error is not generated when a microprocessor calculates the amplitude of the flashing module, and the first analog/digital converter and the second analog/digital converter respectively convert a second alternating current signal and a second direct current signal by the aid of the first analog/digital converter and the second analog/digital converter, so that the first analog/digital converter and the second analog/digital converter can respectively use analog/digital converters with lower resolution and lower sampling frequency, and the cost of the signal measuring circuit is lower.
Description
Technical Field
The present disclosure relates to signal measurement circuits, and more particularly to a signal measurement circuit with low error and low cost and an optical module using the same.
Background
Optical products in the market, such as LEDs, change with the fluctuation of a sine wave of a power supply during operation, so that the intensity of a light source emitted by each LED changes rapidly and repeatedly with time, that is, a flicker signal, which affects human eyes during use, and in order to determine how to improve the flicker signal, the flicker signal must be measured to determine the amplitudes of a dc signal and an ac signal in the flicker signal.
Because the amplitude of the ac signal in the flicker signal is smaller than that of the dc signal, and the flicker signal cannot be directly measured to obtain the ac signal, the conventional circuit structure for measuring the flicker signal amplifies the flicker signal by using an amplifier, so that both the ac signal and the dc signal are amplified, the amplified ac signal and the amplified dc signal are converted from an analog form to a digital form by using an analog/digital converter, and finally, the microprocessor performs calculation to obtain the information of the flicker signal. Although the ac signal can be measured by amplification, the dc signal is amplified by the amplifier synchronously, so that the ac signal is affected by the amplification of the dc signal and easily exceeds the upper limit of the signal that can be output by the amplifier, and the amplifier can only output the upper limit of the signal. In addition, in the conventional circuit structure for measuring the glitch signal, since the analog/digital converter needs to simultaneously convert the dc signal and the ac signal from the analog form to the digital form, the analog/digital converter needs a higher resolution, such as 16 to 18 bits, and a higher sampling frequency, such as 500kHz, which results in a higher cost of the conventional circuit structure for measuring the glitch signal.
Therefore, how to develop a signal measuring circuit and an optical module suitable for the same, which overcome the above disadvantages, is a very urgent need.
Disclosure of Invention
The present disclosure provides a signal measurement circuit and an optical module using the same, which can reduce measurement errors and reduce costs.
To achieve the above object, a broad embodiment of the present disclosure provides a signal measuring circuit comprising: the device comprises a detection unit, a direct current filter, a first signal amplifier, a first analog/digital converter, an alternating current filter, a second signal amplifier, a second analog/digital converter and a microprocessor. The detection unit is used for detecting a flickering signal in an analog form, wherein the flickering signal comprises a first direct current signal and a first alternating current signal. The direct current filter is electrically connected with the detection unit and used for filtering a first direct current signal in the flickering signal so as to output a first alternating current signal. The first signal amplifier is electrically connected with the direct current filter and is used for amplifying the first alternating current signal into a second alternating current signal. The first analog/digital converter is electrically connected with the first signal amplifier and is used for converting the second alternating current signal into a first digital signal in a digital form. The alternating current filter is electrically connected with the detection unit and used for filtering a first alternating current signal in the flickering signal so as to output a first direct current signal. The second signal amplifier is electrically connected with the alternating current filter and used for amplifying the first direct current signal into a second direct current signal. The second analog/digital converter is electrically connected with the second signal amplifier and used for converting the second direct current signal into a second digital signal in a digital form. The microprocessor is electrically connected with the first analog/digital converter and the second analog/digital converter and is used for receiving the first digital signal and the second digital signal.
To achieve the above object, another broad embodiment of the present disclosure provides an optical module including an optical product and a signal measuring circuit, wherein the optical product outputs a flash signal, and the signal measuring circuit includes: the device comprises a detection unit, a direct current filter, a first signal amplifier, a first analog/digital converter, an alternating current filter, a second signal amplifier, a second analog/digital converter and a microprocessor. The detection unit is used for detecting a flickering signal in an analog form, wherein the flickering signal comprises a first direct current signal and a first alternating current signal. The direct current filter is electrically connected with the detection unit and used for filtering a first direct current signal in the flickering signal so as to output a first alternating current signal. The first signal amplifier is electrically connected with the direct current filter and is used for amplifying the first alternating current signal into a second alternating current signal. The first analog/digital converter is electrically connected with the first signal amplifier and is used for converting the second alternating current signal into a first digital signal in a digital form. The alternating current filter is electrically connected with the detection unit and used for filtering a first alternating current signal in the flickering signal so as to output a first direct current signal. The second signal amplifier is electrically connected with the alternating current filter and used for amplifying the first direct current signal into a second direct current signal. The second analog/digital converter is electrically connected with the second signal amplifier and used for converting the second direct current signal into a second digital signal in a digital form. The microprocessor is electrically connected with the first analog/digital converter and the second analog/digital converter and is used for receiving the first digital signal and the second digital signal.
Drawings
Fig. 1 is a circuit configuration diagram of a signal measuring circuit according to a preferred embodiment of the present disclosure.
FIG. 2 is a waveform diagram of the voltage versus time of the glitch signal detected by the signal measurement circuit shown in FIG. 1.
Fig. 3 is a waveform diagram of voltage versus time of a first ac signal of the signal measuring circuit shown in fig. 1.
Fig. 4 is a waveform diagram of voltage versus time of the first dc signal of the signal measuring circuit shown in fig. 1.
Wherein the reference numerals are as follows:
1: signal measuring circuit
2: optical product
3: optical module
F: flicker signal
11: detection unit
12: DC filter
13: first signal amplifier
14: first analog/digital converter
15: AC filter
16: second signal amplifier
17: second analog/digital converter
18: microprocessor
Detailed Description
Some exemplary embodiments that incorporate the features and advantages of the present disclosure will be described in detail in the specification which follows. It is to be understood that the disclosure is capable of various modifications in various embodiments without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.
Referring to fig. 1 to 4, fig. 1 is a circuit structure diagram of a signal measuring circuit according to a preferred embodiment of the present disclosure, fig. 2 is a waveform diagram of a voltage and time of a flicker signal detected by the signal measuring circuit shown in fig. 1, fig. 3 is a waveform diagram of a voltage and time of a first ac signal of the signal measuring circuit shown in fig. 1, and fig. 4 is a waveform diagram of a voltage and time of a first dc signal of the signal measuring circuit shown in fig. 1. As shown in the figure, the signal measuring circuit 1 of the present disclosure is applied to an optical module 3, such as an LED module, and is used to measure a flicker signal f (flicker) generated by an optical product 2, such as an LED, in the optical module 3, as shown in the waveform diagram of fig. 2. The signal measuring circuit 1 includes a detecting unit 11, a dc filter 12, a first signal amplifier 13, a first analog/digital converter 14, an ac filter 15, a second signal amplifier 16, a second analog/digital converter 17, and a microprocessor 18.
The detecting unit 11 is electrically connected to the optical product 2 for detecting a flashing signal F generated by the optical product 2 in an analog form, wherein the flashing signal F includes a first ac signal S1 and a first dc signal S2. The dc filter 12 is electrically connected to the detecting unit 11 for filtering the first dc signal S2 in the flicker signal F to output a first ac signal S1, as shown in the waveform diagram of fig. 3. The first signal amplifier 13 is electrically connected to the dc filter 12 for amplifying the first ac signal S1 into a second ac signal, wherein the amplification factor of the first signal amplifier 13 can be, but is not limited to, 5 to 10 times. The first analog/digital converter 14 is electrically connected to the first signal amplifier 13 for converting the second ac signal into a digital first digital signal, wherein the sampling frequency of the first analog/digital converter 14 can be, but is not limited to, less than 100kHz, and the resolution of the first analog/digital converter 14 can be, but is not limited to, 8 bit.
The ac filter 15 is electrically connected to the detecting unit 11 for filtering the first ac signal S1 in the flicker signal F to output a first dc signal S2, as shown in the waveform diagram of fig. 4. The second signal amplifier 16 is electrically connected to the ac filter 15 for amplifying the first dc signal S2 into a second dc signal, wherein the amplification factor of the second signal amplifier 16 can be, but is not limited to, 10 to 20 times. The second analog/digital converter 17 is electrically connected to the second signal amplifier 16 for converting the second direct current signal into a second digital signal in a digital form, wherein the sampling frequency of the second analog/digital converter 17 can be, but is not limited to, less than 100kHz, and the resolution of the second analog/digital converter 17 can be, but is not limited to, 8 bit. The microprocessor 18 is electrically connected to the first analog/digital converter 14 and the second analog/digital converter 17 for receiving the first digital signal and the second digital signal. In some embodiments, the microprocessor 18 further calculates a Flicker Modulation Amplitude (FMA) according to the first digital signal and the second digital signal, wherein the Flicker module Amplitude is obtained by dividing the Amplitude of the first ac signal S1 by two times the first dc signal S2, and the Amplitude of the first ac signal S1 is obtained by subtracting the minimum value of the first ac signal S1 from the maximum value of the first ac signal S1, and the larger the value of the Flicker module Amplitude, the larger the Amplitude of the first ac signal S1 is, the more obvious the Flicker Amplitude of the Flicker signal F is, the larger the influence on the human eye is, and the smaller the value of the Flicker module Amplitude, the smaller the Amplitude of the first ac signal S1 is, the less obvious the Flicker Amplitude of the Flicker signal F is, and the smaller the influence on the human eye is.
In summary, the signal measuring circuit of the present disclosure includes a dc filter and an ac filter to independently output the first dc signal and the first ac signal in the flash signal, and then independently amplify the first ac signal by using the first signal amplifier and the second signal amplifier, respectively, so that the first ac signal of the present disclosure is not affected by the amplification of the first dc signal when amplified, and therefore the first ac signal of the present disclosure does not exceed the upper limit of the signal that can be output by the second signal amplifier and can be faithfully amplified, so that the microprocessor of the present disclosure does not generate an error when calculating the amplitude of the flash module. In addition, since the signal measuring circuit of the present disclosure converts the second ac signal and the second dc signal by using the first analog/digital converter and the second analog/digital converter, respectively, instead of converting the second ac signal and the second dc signal by using a single analog/digital converter, the first analog/digital converter and the second analog/digital converter of the present disclosure may use analog/digital converters with lower resolution and lower sampling frequency, respectively, so that the cost of the signal measuring circuit of the present disclosure is lower.
Claims (8)
1. A signal measurement circuit, comprising:
the device comprises a detection unit, a control unit and a processing unit, wherein the detection unit is used for detecting a flash signal in an analog form, and the flash signal comprises a first direct current signal and a first alternating current signal;
the direct current filter is electrically connected with the detection unit and used for filtering the first direct current signal in the flickering signal so as to output the first alternating current signal;
a first signal amplifier electrically connected to the DC filter for amplifying the first AC signal to a second AC signal;
a first analog/digital converter electrically connected to the first signal amplifier for converting the second AC signal into a first digital signal in digital form;
the alternating current filter is electrically connected with the detection unit and used for filtering the first alternating current signal in the flickering signal so as to output the first direct current signal;
the second signal amplifier is electrically connected with the alternating current filter and used for amplifying the first direct current signal into a second direct current signal;
a second analog/digital converter electrically connected to the second signal amplifier for converting the second DC signal into a digital second digital signal; and
and the microprocessor is electrically connected with the first analog/digital converter and the second analog/digital converter and used for receiving the first digital signal and the second digital signal.
2. The signal measuring circuit of claim 1, wherein the microprocessor further calculates a flash module amplitude from the first digital signal and the second digital signal, wherein the flash module amplitude is the amplitude of the first ac signal divided by twice the first dc signal.
3. The signal measurement circuit of claim 1 in which the glitch signal is a signal generated by an optical product.
4. The signal measurement circuit of claim 1 wherein the first signal amplifier has a magnification of 5 to 10 times.
5. The signal measurement circuit of claim 1 wherein the second signal amplifier has a magnification of 10 to 20 times.
6. The signal measurement circuit of claim 1, wherein the sampling frequencies of the first and second analog/digital converters are less than 100kHz, respectively.
7. The signal measuring circuit of claim 1, wherein the first and second analog/digital converters each have a resolution of 8 bits.
8. An optical module, comprising:
an optical product for generating a flashing signal; and
a signal measurement circuit, comprising:
the device comprises a detection unit, a control unit and a processing unit, wherein the detection unit is used for detecting a flash signal in an analog form, and the flash signal comprises a first direct current signal and a first alternating current signal;
the direct current filter is electrically connected with the detection unit and used for filtering the first direct current signal in the flickering signal so as to output the first alternating current signal;
a first signal amplifier electrically connected to the DC filter for amplifying the first AC signal to a second AC signal;
a first analog/digital converter electrically connected to the first signal amplifier for converting the second AC signal into a first digital signal in digital form;
the alternating current filter is electrically connected with the detection unit and used for filtering the first alternating current signal in the flickering signal so as to output the first direct current signal;
the second signal amplifier is electrically connected with the alternating current filter and used for amplifying the first direct current signal into a second direct current signal;
a second analog/digital converter electrically connected to the second signal amplifier for converting the second DC signal into a digital second digital signal; and
and the microprocessor is electrically connected with the first analog/digital converter and the second analog/digital converter and used for receiving the first digital signal and the second digital signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910757323.8A CN112394218A (en) | 2019-08-16 | 2019-08-16 | Signal measurement circuit and optical module suitable for same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910757323.8A CN112394218A (en) | 2019-08-16 | 2019-08-16 | Signal measurement circuit and optical module suitable for same |
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| CN112394218A true CN112394218A (en) | 2021-02-23 |
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