CN213986767U - Circuit for detecting light flicker - Google Patents
Circuit for detecting light flicker Download PDFInfo
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- CN213986767U CN213986767U CN202022529616.1U CN202022529616U CN213986767U CN 213986767 U CN213986767 U CN 213986767U CN 202022529616 U CN202022529616 U CN 202022529616U CN 213986767 U CN213986767 U CN 213986767U
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Abstract
The utility model relates to a circuit for detecting light scintillation, include: a detection circuit, an amplification circuit, and a comparison circuit; the detection circuit is used for detecting the brightness change of the lamp and outputting a detection signal; the amplifying circuit is connected with the detection circuit, receives the detection signal and amplifies the detection signal; the comparison circuit is connected with the amplifying circuit, receives the detection signal amplified by the amplifying circuit, compares the detection signal amplified by the amplifying circuit with the reference signal, and outputs a comparison signal. The utility model discloses whether the light that can automated inspection lamps and lanterns glimmers, do not rely on measurement personnel's eyes discernment, detect the accuracy, can avoid measurement personnel to directly face light observation simultaneously, reduce the injury of light to eyes.
Description
Technical Field
The utility model relates to a technical field that light detected, more specifically say, relate to a circuit for detecting light scintillation.
Background
Whether a lamp matched with a driving power supply flickers or not is tested in the traditional sense, the flicker is identified by eyes of a detector, and the final judgment result is different because the eyes of the detector react differently to light, so that no specific quantization standard exists; meanwhile, the strong light is easy to cause damage to the eyes of the human body and is not easy to identify.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a circuit for detecting light scintillation is provided.
The utility model provides a technical scheme that its technical problem adopted is: a circuit for detecting light flicker is constructed, comprising: a detection circuit, an amplification circuit, and a comparison circuit;
the detection circuit is used for detecting the brightness change of the lamp and outputting a detection signal;
the amplifying circuit is connected with the detection circuit, receives the detection signal and amplifies the detection signal;
the comparison circuit is connected with the amplifying circuit, receives the detection signal amplified by the amplifying circuit, compares the detection signal amplified by the amplifying circuit with a reference signal, and outputs a comparison signal.
Preferably, the detection circuit comprises: a detection signal generating circuit and a detection signal output circuit;
the detection signal generating circuit is used for detecting the brightness change of the lamp and generating a detection signal according to the brightness change of the lamp;
the detection signal output circuit is connected with the detection signal generating circuit, receives the detection signal and outputs the detection signal to the amplifying circuit.
Preferably, the detection signal generation circuit includes: the circuit comprises a photosensitive element, a first resistor and a second resistor;
one end of the photosensitive element is connected with the positive electrode of a power supply, the other end of the photosensitive element is connected with the first end of the first resistor and connected to the detection signal output circuit, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
and the connection end of the photosensitive element and the first resistor outputs the detection signal to the detection signal output circuit.
Preferably, the photosensitive element includes: a photodiode.
Preferably, the second resistor is a photo-resistor.
Preferably, the detection signal output circuit includes: a first capacitor and a third resistor;
the first end of the first capacitor is connected with the connecting end of the photosensitive element and the first resistor, the second end of the first capacitor is connected with the first end of the third resistor, and the second end of the third resistor is grounded;
the first end of the first capacitor is connected to the detection signal generated by the detection signal generating circuit, and the connection end between the second end of the first capacitor and the first end of the third resistor outputs the detection signal to the amplifying circuit.
Preferably, the amplifying circuit includes: a fourth resistor, a fifth resistor, a sixth resistor and an operational amplifier;
the first end of the fourth resistor is connected with the connecting end of the first capacitor and the third resistor, the second end of the fourth resistor is connected with the negative input end of the operational amplifier, the first end of the sixth resistor is connected with the negative input end of the operational amplifier, the second end of the sixth resistor is connected with the output end of the operational amplifier, the positive input end of the operational amplifier is grounded through the fifth resistor, and the output end of the operational amplifier is connected to the comparison circuit.
Preferably, the comparison circuit includes: a comparator;
the positive input end of the comparator is connected with the output end of the operational amplifier, the negative input end of the comparator is connected with the reference voltage, and the output end of the comparator outputs a comparison signal.
Preferably, the method further comprises the following steps: and the signal acquisition circuit is connected with the comparison circuit to receive and display the comparison signal output by the comparison circuit.
Preferably, the signal acquisition circuit comprises an oscilloscope.
Implement the utility model discloses a circuit for detecting light scintillation has following beneficial effect: the method comprises the following steps: a detection circuit, an amplification circuit, and a comparison circuit; the detection circuit is used for detecting the brightness change of the lamp and outputting a detection signal; the amplifying circuit is connected with the detection circuit, receives the detection signal and amplifies the detection signal; the comparison circuit is connected with the amplifying circuit, receives the detection signal amplified by the amplifying circuit, compares the detection signal amplified by the amplifying circuit with the reference signal, and outputs a comparison signal. The utility model discloses whether the light that can automated inspection lamps and lanterns glimmers, do not rely on measurement personnel's eyes discernment, detect the accuracy, can avoid measurement personnel to directly face light observation simultaneously, reduce the injury of light to eyes.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a circuit for detecting light flicker provided by an embodiment of the present invention;
fig. 2 is a circuit diagram of the circuit for detecting light flicker of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of an alternative embodiment of various embodiments of a circuit for detecting light flicker provided by the present invention. The circuit can be applied to the dimming function test of the LED driving power supply and can also be applied to the detection of an automatic test system.
Specifically, as shown in fig. 1, the circuit for detecting the flicker of the lamp light includes: a detection circuit 11, an amplification circuit 12, and a comparison circuit 13.
The detection circuit 11 is configured to detect a brightness change of the lamp and output a detection signal; the amplifying circuit 12 is connected with the detecting circuit 11, receives the detection signal and amplifies the detection signal; the comparison circuit 13 is connected to the amplification circuit 12, receives the detection signal amplified by the amplification circuit 12, compares the detection signal amplified by the amplification circuit 12 with a reference signal, and outputs a comparison signal.
Whether can realize twinkling lamp light through this circuit and carry out automated inspection, can solve when LED drive power supply test dimming function because of the naked eye just to light observation cause eyes uncomfortable, to the damage of eyes or because the light is little when the dimming glimmer and the problem of not finding the product defect. The product dimming circuit can replace human eyes to observe the condition of light when the product is dimmed, and when the product is dimmed, and the product is flickered, and the brightness is unstable, the circuit can output signals to prompt.
Optionally, in some embodiments, the detection circuit 11 includes: a detection signal generating circuit and a detection signal output circuit.
The detection signal generating circuit is used for detecting the brightness change of the lamp and generating a detection signal according to the brightness change of the lamp; the detection signal output circuit is connected to the detection signal generating circuit, receives the detection signal, and outputs the detection signal to the amplifying circuit 12. Specifically, when the brightness of the lamp is different, the detection signal generation circuit can output different detection signals, and then the detection signals indicate whether the lamp light of the lamp flickers. The detection signal output circuit is used for transmitting the detection signal, and the detection signal output circuit is only related to the brightness variation of the lamp and is not related to the brightness, so that the condition of misjudgment can be avoided.
Alternatively, in some embodiments, the detection signal generating circuit may perform light detection through a photosensitive element, wherein the photosensitive element includes, but is not limited to, a photodiode, a photocoupler, and the like.
The amplifier circuit 12 amplifies the detection signal. Because the detection signal output by the detection circuit 11 is small and is not beneficial to the identification processing of the post-stage circuit, the detection signal can be correspondingly amplified and transmitted to the post-stage circuit through the amplification processing of the amplification circuit 12, so that the signal processing is more stable and reliable.
The comparison circuit 13 is configured to compare the detection signal with a reference voltage and output a corresponding comparison signal, where the comparison signal is used to determine whether the light flickers. Alternatively, the comparison circuit 13 may be implemented by a comparator.
Specifically, referring to fig. 2, fig. 2 is a circuit diagram of an optional embodiment of each embodiment of the circuit for detecting light flicker provided by the present invention.
As shown in fig. 2, in this embodiment, the detection signal generation circuit includes: the photosensitive element, a first resistor R1 and a second resistor VR 2.
One end of the photosensitive element is connected with the anode of a power supply, the other end of the photosensitive element is connected with the first end of the first resistor R1 and connected to the detection signal output circuit, the second end of the first resistor R1 is connected with the first end of the second resistor VR2, and the second end of the second resistor VR2 is grounded; the connection end of the photosensitive element and the first resistor R1 outputs a detection signal to a detection signal output circuit.
Optionally, the photosensitive element may be: a photodiode. The second resistor VR2 may be a photo-resistor.
As shown in fig. 2, the detection signal output circuit includes: a first capacitor C1 and a third resistor R3.
The first end of the first capacitor C1 is connected with the connection end of the photosensitive element and the first resistor R1, the second end of the first capacitor C1 is connected with the first end of the third resistor R3, and the second end of the third resistor R3 is grounded; the first end of the first capacitor C1 is connected to the detection signal generated by the detection signal generating circuit, and the connection end between the second end of the first capacitor C1 and the first end of the third resistor R3 outputs the detection signal to the amplifying circuit 12.
As shown in fig. 2, the amplifier circuit 12 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and an operational amplifier U1.
The first end of the fourth resistor R4 is connected with the connection end of the first capacitor C1 and the third resistor R3, the second end of the fourth resistor R4 is connected with the negative input end of the operational amplifier U1, the first end of the sixth resistor R6 is connected with the negative input end of the operational amplifier U1, the second end of the sixth resistor R6 is connected with the output end of the operational amplifier U1, the positive input end of the operational amplifier U1 is grounded through the fifth resistor R5, and the output end of the operational amplifier U1 is connected to the comparison circuit 13.
Further, as shown in fig. 2, in this embodiment, the comparison circuit 13 includes: comparator U2. The positive input end of the comparator U2 is connected with the output end of the operational amplifier U1, the negative input end of the comparator U2 is connected with the reference voltage, and the output end of the comparator U2 outputs a comparison signal.
Further, in some other embodiments, the circuit for detecting the light flicker may further include: and a signal acquisition circuit 14 connected with the comparison circuit 13 for receiving and displaying the comparison signal output by the comparison circuit 13. Optionally, the signal acquisition circuit 14 comprises an oscilloscope. Of course, it is understood that in other embodiments, the signal acquisition circuit 14 may be implemented by other devices or circuits as long as the comparison signal can be output for the inspection personnel to view.
As shown in fig. 2, the photodiode D1 is illuminated to generate a current, so that voltages (i.e., voltages at points a and c) are generated across the first resistor R1 and the second resistor VR2 (photo resistor). The voltage generated is larger when the illuminance is larger, and the voltages at the points a and c are almost stable and unchanged when the illuminance is stable and unchanged. The second resistor VR2 is mainly used to compensate the circuit detection sensitivity, when the lamp brightness is small, the resistance of the second resistor VR2 becomes large to increase the ac point voltage, and when the lamp brightness is large, the resistance of the second resistor VR2 becomes small to make the ac voltage smaller than Vcc.
The third resistor R3 and the first capacitor C1 make the potential at the point b related to the brightness change of the lamp only and not to the brightness. That is, the potential at the point b is pulled down to zero by the third resistor R3 when the lamp brightness is not changed, and the first capacitor C1 and the third resistor R3 are repeatedly charged and discharged while the brightness is changing, so that the potential at the point b is constantly changed. The fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the operational amplifier U1 form an amplifying circuit 12 for amplifying the voltage at the point b and then comparing the amplified voltage with a reference voltage Vf through a comparator U2. When the light flickers, the output end of the comparator U2 outputs a square wave with the frequency same as the light flickering frequency; if the lamp is not flashing, the output of comparator U2 outputs a smooth, straight-line waveform.
The detection sensitivity of the circuit can be adjusted by adjusting the reference voltage Vf, and an oscilloscope is connected to the output end of the comparator U2 to output and display the comparison signal.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention. It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A circuit for detecting light flashes, comprising: a detection circuit, an amplification circuit, and a comparison circuit;
the detection circuit is used for detecting the brightness change of the lamp and outputting a detection signal;
the amplifying circuit is connected with the detection circuit, receives the detection signal and amplifies the detection signal;
the comparison circuit is connected with the amplifying circuit, receives the detection signal amplified by the amplifying circuit, compares the detection signal amplified by the amplifying circuit with a reference signal, and outputs a comparison signal.
2. A circuit for detecting light flashes as claimed in claim 1, characterized in that the detection circuit comprises: a detection signal generating circuit and a detection signal output circuit;
the detection signal generating circuit is used for detecting the brightness change of the lamp and generating a detection signal according to the brightness change of the lamp;
the detection signal output circuit is connected with the detection signal generating circuit, receives the detection signal and outputs the detection signal to the amplifying circuit.
3. A circuit for detecting lamp light flicker according to claim 2, wherein the detection signal generating circuit comprises: the circuit comprises a photosensitive element, a first resistor and a second resistor;
one end of the photosensitive element is connected with the positive electrode of a power supply, the other end of the photosensitive element is connected with the first end of the first resistor and connected to the detection signal output circuit, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
and the connection end of the photosensitive element and the first resistor outputs the detection signal to the detection signal output circuit.
4. A circuit for detecting light flicker according to claim 3, wherein said light sensing element comprises: a photodiode.
5. A circuit for detecting flicker of a light as defined in claim 3, wherein the second resistor is a photo-resistor.
6. A circuit for detecting lamp light flicker according to claim 3, wherein the detection signal output circuit comprises: a first capacitor and a third resistor;
the first end of the first capacitor is connected with the connecting end of the photosensitive element and the first resistor, the second end of the first capacitor is connected with the first end of the third resistor, and the second end of the third resistor is grounded;
the first end of the first capacitor is connected to the detection signal generated by the detection signal generating circuit, and the connection end between the second end of the first capacitor and the first end of the third resistor outputs the detection signal to the amplifying circuit.
7. The circuit for detecting lamp light flicker of claim 6, wherein the amplification circuit comprises: a fourth resistor, a fifth resistor, a sixth resistor and an operational amplifier;
the first end of the fourth resistor is connected with the connecting end of the first capacitor and the third resistor, the second end of the fourth resistor is connected with the negative input end of the operational amplifier, the first end of the sixth resistor is connected with the negative input end of the operational amplifier, the second end of the sixth resistor is connected with the output end of the operational amplifier, the positive input end of the operational amplifier is grounded through the fifth resistor, and the output end of the operational amplifier is connected to the comparison circuit.
8. The circuit for detecting light flicker according to claim 7, wherein the comparison circuit comprises: a comparator;
the positive input end of the comparator is connected with the output end of the operational amplifier, the negative input end of the comparator is connected with the reference voltage, and the output end of the comparator outputs a comparison signal.
9. A circuit for detecting flicker of light as defined in any one of claims 1 to 8, further comprising: and the signal acquisition circuit is connected with the comparison circuit to receive and display the comparison signal output by the comparison circuit.
10. A circuit for detecting lamp light flicker as defined in claim 9, wherein the signal acquisition circuit comprises an oscilloscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022529616.1U CN213986767U (en) | 2020-11-04 | 2020-11-04 | Circuit for detecting light flicker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022529616.1U CN213986767U (en) | 2020-11-04 | 2020-11-04 | Circuit for detecting light flicker |
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| Publication Number | Publication Date |
|---|---|
| CN213986767U true CN213986767U (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022529616.1U Active CN213986767U (en) | 2020-11-04 | 2020-11-04 | Circuit for detecting light flicker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114637366A (en) * | 2022-05-18 | 2022-06-17 | 成都本原聚能科技有限公司 | Detection circuit and chip independent of process and temperature and application of lumen detection |
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2020
- 2020-11-04 CN CN202022529616.1U patent/CN213986767U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114637366A (en) * | 2022-05-18 | 2022-06-17 | 成都本原聚能科技有限公司 | Detection circuit and chip independent of process and temperature and application of lumen detection |
| CN114637366B (en) * | 2022-05-18 | 2022-08-23 | 成都本原聚能科技有限公司 | Detection circuit and chip independent of process and temperature and application of lumen detection |
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