CN216437530U - LED drive circuit with photosensitive inductive switch - Google Patents
LED drive circuit with photosensitive inductive switch Download PDFInfo
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- CN216437530U CN216437530U CN202122907389.6U CN202122907389U CN216437530U CN 216437530 U CN216437530 U CN 216437530U CN 202122907389 U CN202122907389 U CN 202122907389U CN 216437530 U CN216437530 U CN 216437530U
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Abstract
The application provides a LED drive circuit with photosensitive inductive switch, the circuit includes: the device comprises a rectification transformation module, a power supply module, a photosensitive induction control module and an LED load module; the photosensitive induction control module comprises a photosensitive induction unit and a controller unit; the controller unit receives the detection signal output by the photosensitive induction unit, judges whether the detection signal meets a preset condition or not, and outputs an enabling signal to the LED load module if the detection signal meets the preset condition, and the LED load module is lightened; and if the preset condition is not met, the enabling signal is not output to the LED load module, and the LED load module is not lightened. The application provides a LED drive circuit with photosensitive inductive switch, the LED drive circuit start in the twinkling of an eye with photosensitive induction unit sensitization in the twinkling of an eye, can not produce the scintillation. Thus, the user experience is improved.
Description
Technical Field
The application relates to the technical field of circuit design, in particular to an LED driving circuit with a photosensitive inductive switch.
Background
The LED with light sensation flickers at the moment of starting and sensing light. The resistance value of the photosensitive resistor changes while sensing light, the circuit current also changes, but the triode is in a critical conduction state when the current rises, and the signal detected by the MCU is a disordered high-low level signal, so that the logic of the LED is controlled to be on and off to flicker.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an LED driving circuit with a photosensitive induction switch without flicker.
To achieve the above object, the present application provides an LED driving circuit having a photosensitive inductive switch, comprising: the device comprises a rectification transformation module, a power supply module, a photosensitive induction control module and an LED load module;
the input end of the rectification transformation module is connected with external alternating current, and the output end of the rectification transformation module is connected with the LED load module, receives external alternating current input, and converts the external alternating current input into first direct current voltage output required by the LED load module;
the input end of the power supply module is connected with the rectification transformation module, the output end of the power supply module is connected with the photosensitive induction control module, and the power supply module receives a first direct current voltage output by the rectification transformation module and outputs a second direct current voltage required by the photosensitive induction control module;
the photosensitive induction control module comprises a photosensitive induction unit and a controller unit; the photosensitive sensing unit receives photosensitive sensing operation and outputs a detection signal; the controller unit is simultaneously connected with the photosensitive sensing unit and the LED load module, receives the detection signal output by the photosensitive sensing unit, judges whether the detection signal meets a preset condition or not, outputs an enabling signal to the LED load module if the detection signal meets the preset condition, and lights the LED load module; and if the preset condition is not met, the enabling signal is not output to the LED load module, and the LED load module is not lightened.
Further, the preset condition is that the time for which the detection signal continues to be at the high level is greater than a preset threshold.
Further, at the instant of starting the LED driving circuit and at the instant of sensing the light by the photosensitive sensing unit, the detection signals are at disordered high and low levels.
Further, the rectification transformation module comprises a rectification bridge, and a first input end of the rectification bridge is connected with a zero line of the external alternating current through a first capacitor and a sixth resistor which are connected in parallel as a first end of an input end of the rectification transformation module; the second input end of the rectifier bridge is used as the second end of the input end of the rectification transformation module through a fuse and a switch which are connected in series, and is connected with the live wire of the external alternating current; the first output end of the rectifier bridge is connected with the second output end of the rectifier bridge through a first electrolytic capacitor, and is used as the first end of the output end of the rectification transformation module through a first resistor and is connected with the LED load module; and the second output end of the rectifier bridge is used as the second end of the output end of the rectification transformation module and is connected with the ground.
Further, the first end of the output end of the rectification transformation module is connected with the second end of the output end of the rectification transformation module through a first voltage stabilizing diode.
Further, the LED load module comprises a plurality of groups of LED strings which are connected in parallel and/or in series, anodes of the LED strings which are connected in parallel are connected together to form a common anode, cathodes of the LED strings which are connected in parallel are connected together to form a common cathode, the common anode is used as a first input end of the LED load module through a second resistor and is connected with a first end of an output end of the rectification transformation module, the common cathode is connected with a collector electrode of a first triode, and an emitter electrode of the first triode is used as a second input end of the LED load module and is connected with a second end of the output end of the rectification transformation module; and the base electrode of the first triode is used as a third input end of the LED load module, is connected with the controller unit of the photosensitive induction control module, and receives the enabling signal output by the controller unit.
Furthermore, the power supply module comprises a power supply chip, and a third end of the power supply chip is used as an input end of the power supply module, is connected with a first end of an output end of the rectification transformation module, and is connected with a first end of the power supply chip through a second capacitor; the second end of the power supply chip is used as the output end of the power supply module and is connected with the first end of the power supply chip through a third capacitor; and the first end of the power supply chip is a grounding end and is connected with the ground.
Further, the controller unit comprises a main control chip, wherein the first end of the main control chip is a power supply end, is connected with the output end of the power supply module and is connected with the ground through a fourth capacitor; the second end of the main control chip is a detection end and is connected with the photosensitive induction unit; the fifth end of the main control chip is an output end and is connected with the third input end of the LED load module; and the eighth end of the main control chip is a grounding end and is connected with the ground.
Further, the photosensitive sensing unit comprises a photosensitive sensing chip, a first end of the photosensitive sensing chip is connected with the output end of the power supply module, a second end of the photosensitive sensing chip is connected with the ground through a thirteenth resistor, and the second end of the photosensitive sensing chip is connected with one end of a fourteenth resistor; the other end of the fourteenth resistor is connected with a base electrode of a second triode, a collector electrode of the second triode is used as an output end of the photosensitive induction unit, is connected with a second end of the main control chip and provides a detection signal for the main control chip, the collector electrode of the second triode is further connected with an output end of the power supply module through a fifteenth resistor, and an emitting electrode of the second triode is connected with the ground.
Further, the model of the main control chip U3 is CS98P154CO, the model of the photosensitive sensing chip U4 is UCS31061R, and the preset threshold value in the preset condition is 500 ms.
This application LED drive circuit with photosensitive inductive switch has following beneficial effect:
the controller unit receives the detection signal output by the photosensitive sensing unit, judges whether the detection signal meets a preset condition or not, and outputs an enabling signal to the LED load module if the detection signal meets the preset condition, and the LED load module is lightened; if the preset condition is not met, the enabling signal is not output to the LED load module, and the LED load module is not lightened; the preset condition is that the time for which the detection signal is continuously at the high level is greater than a preset threshold value; at the moment when the LED driving circuit is started and the moment when the photosensitive sensing unit is sensitive to light, the detection signals are in disorder high and low levels, and the time for the detection signals to continuously be the high level is not greater than a preset threshold value, so that the LED load module cannot be lightened, and the LED load module cannot be immediately turned off, namely, flicker cannot be generated. Thus, the user experience is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed 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 only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an LED driving circuit with a photosensitive inductive switch provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise specified, the use of directional terms such as "upper", "lower", "left" and "right" generally refer to upper, lower, left and right in the actual use or operation of the device, and specifically to the orientation of the drawing figures.
The present application provides an LED driving circuit having a photosensitive inductive switch, which will be described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
Referring to fig. 1, the present application provides an LED driving circuit with a photosensitive inductive switch, including: the device comprises a rectification transformation module, a power supply module, a photosensitive induction control module and an LED load module;
the input end of the rectification transformation module is connected with external alternating current, and the output end of the rectification transformation module is connected with the LED load module, receives external alternating current input, and converts the external alternating current input into first direct current voltage output required by the LED load module;
the input end of the power supply module is connected with the rectification transformation module, the output end of the power supply module is connected with the photosensitive induction control module, and the power supply module receives a first direct current voltage output by the rectification transformation module and outputs a second direct current voltage required by the photosensitive induction control module;
the photosensitive induction control module comprises a photosensitive induction unit and a controller unit; the photosensitive sensing unit receives photosensitive sensing operation and outputs a detection signal; the controller unit is simultaneously connected with the photosensitive sensing unit and the LED load module, receives the detection signal output by the photosensitive sensing unit, judges whether the detection signal meets a preset condition or not, outputs an enabling signal to the LED load module if the detection signal meets the preset condition, and lights the LED load module; and if the preset condition is not met, the enabling signal is not output to the LED load module, and the LED load module is not lightened.
In an embodiment, the preset condition is that a time during which the detection signal continues to be at the high level is greater than a preset threshold. That is, the LED load module is only enabled to light if the detection signal is continuously maintained at a high level for a long enough time, otherwise, the detection signal is regarded as an invalid signal, and the LED load module is not lighted. Of course, according to actual needs, the preset condition may also be that the time for which the detection signal continues to be at the low level is greater than a preset threshold, or other thresholds of other parameters, and those skilled in the art may perform adaptive adjustment setting according to actual application situations. The preset threshold may also be adjusted and selected according to the actual usage, and in a specific embodiment, is 500 ms.
In addition, specifically, the rectification and transformation module comprises a rectifier bridge BD1, a first input end of the rectifier bridge BD1 is connected with a zero line N1 of the external alternating current through a first capacitor C1 and a sixth resistor R6 which are connected in parallel as a first end of the input end of the rectification and transformation module; a second input end of the rectifier bridge BD1 is connected with a live wire L1 of the external alternating current through a fuse F1 and a switch SW1 which are connected in series as a second end of the input end of the rectification transformation module; a first output end of the rectifier bridge BD1 is connected with a second output end of the rectifier bridge through a first electrolytic capacitor EC1, and is connected with the LED load module through a first resistor R1 as a first end of an output end of the rectification transformation module; and a second output end of the rectifier bridge BD1 is used as a second end of the output end of the rectifying and transforming module and is connected with the ground GND. That is, the external alternating current is stepped down by the first capacitor C1 and the sixth resistor R6 connected in parallel, then is converted into direct current by the rectifier bridge BD1, and is filtered by the first resistor R1 and the first electrolytic capacitor EC1, so as to be converted into a first direct current voltage output required by the LED load module, for example, 5V.
Further, the first end of the output end of the rectification transformation module is connected with the second end of the output end of the rectification transformation module through a first voltage stabilizing diode ZD1, so as to stabilize the first direct-current voltage output by the rectification transformation module and prevent the influence on the LED load module due to the change of external alternating current.
The LED load module comprises a plurality of groups of LED strings which are connected in parallel and/or in series, anodes of the LED strings which are connected in parallel are connected together to form a common anode, and cathodes of the LED strings which are connected in parallel are connected together to form a common cathode. It is first explained that the multiple groups of LED strings connected in parallel and/or in series according to the present application need to be understood in an expanded manner, and even the case of only one specific LED may be included according to actual needs. In general practical use, there are often multiple LED strings, and they may be connected in parallel, in series, or in a mixture of parallel and series. For example, in the embodiment shown in fig. 1, there are four LEDs, where the first LED1 is connected in series with the fourth LED4, the second LED2 is connected in series with the third LED3, and then the two are connected in parallel. In parallel LED strings, all anodes are connected together, called common anode, and all cathodes are connected together, called common cathode.
Further, the common anode is used as a first input end of the LED load module through a second resistor R2, and is connected to a first end of the output end of the rectification transformation module, the common cathode is connected to a collector of a first triode Q1, an emitter of the first triode Q1 is used as a second input end of the LED load module, and is connected to a second end of the output end of the rectification transformation module, that is, is connected to ground GND; the base electrode of the first triode Q1 is used as a third input end of the LED load module, is connected with the controller unit of the photosensitive induction control module, and receives the enabling signal output by the controller unit.
The power supply module comprises a power supply chip U1, and converts the first direct current voltage, such as 5V, output by the rectification transformation module into a second direct current voltage, such as 3.3V, required by the photosensitive induction control module. The third end of the power supply chip U1 is used as the input end of the power supply module, is connected with the first end of the output end of the rectification transformation module, and is connected with the first end of the power supply chip U1 through a second capacitor C2; the second end of the power supply chip U1 is used as the output end of the power supply module and is connected with the first end of the power supply chip U1 through a third capacitor C3; the first end of the power supply chip U1 is a ground GND, and is connected to the ground GND. In one embodiment, the power supply chip U1 is model AP2210N-3.3TRE 1.
The controller unit comprises a main control chip U3, wherein a first end of the main control chip U3 is a power supply end VDD, is connected with an output end of the power supply module, and is connected with a ground GND through a fourth capacitor C4; the second end of the main control chip U3 is a detection end OSCI and is connected with the photosensitive sensing unit; a fifth end of the main control chip U3 is an enable end EN, and is connected to a third input end of the LED load module; the eighth end of the main control chip U3 is a ground GND, and is connected to the ground GND. In one embodiment, the main control chip U3 has a model number CS98P154 CO.
The photosensitive sensing unit comprises a photosensitive sensing chip U4, a first end of the photosensitive sensing chip U4 is connected with an output end of the power supply module, a second end of the photosensitive sensing chip U4 is connected with the ground GND through a thirteenth resistor R13, and a second end of the photosensitive sensing chip U4 is connected with one end of a fourteenth resistor R14; the other end of the fourteenth resistor R14 is connected to a base of a second triode Q2, a collector of the second triode Q2 serves as an output end of the photosensitive sensing unit, is connected to a second end of the main control chip U3, and provides a detection signal for the main control chip U3, a collector of the second triode Q2 is further connected to an output end of the power supply module through a fifteenth resistor R15, and an emitter of the second triode Q2 is connected to ground GND. In one embodiment, the photosensitive sensor chip U4 is of the type UCS 31061R.
In one embodiment, when the light-sensitive sensing unit senses light normally and stably and needs to turn on the LED load module, the detection signal output by the collector of the second transistor Q2 is at a high level. However, at the moment of light sensing of the photosensitive sensing unit, the resistance value of the photosensitive sensing chip changes, the circuit current also changes, the second triode Q2 is in a critical conduction state at the stage of rising, and the detection signal output by the collector of the second triode Q2 is a disordered high-low level. If the detection signal output by the collector of the second transistor Q2 is a high level, the enable terminal of the main control chip outputs a high level, the first transistor Q1 is turned on, and the LED load module is turned on; when the detection signal output by the collector of the second triode Q2 is at a low level, the enable terminal of the main control chip outputs a low level, the first triode Q1 is turned off, and the LED load module is not turned on; thus, if the detection signal output by the collector of the second transistor Q2 is a chaotic high/low level, the enable terminal of the main control chip also outputs a chaotic high/low level, and the LED load module is continuously turned on/off, which is called flicker. The same is true at the moment when the LED driving circuit is started by opening the switch; especially, if the current ambient light is supposed to light the LED load module, the switch is turned on, and the flicker is very obvious; even if the current ambient light should not cause the LED load module to light up, the switch is turned on, and the flickering often occurs.
As described above, the main control chip may determine whether the time that the detection signal continues to be at the high level is greater than a preset threshold. If the detection signal is larger than the preset threshold value, the LED load module is enabled to be lightened, otherwise, the detection signal is regarded as an invalid signal, and the LED load module is not lightened. At the moment when the LED driving circuit is started and at the moment when the photosensitive sensing unit is sensitive to light, the detection signal changes between high and low levels, and the duration of the detection signal lasting to the high level generally does not exceed a preset threshold (the preset threshold needs to be set to be proper enough), so that the LED load module cannot be lightened, and cannot be immediately turned off, namely, flicker cannot be generated. Thus, the user experience is improved.
This application LED drive circuit with photosensitive inductive switch has following beneficial effect:
the controller unit receives the detection signal output by the photosensitive sensing unit, judges whether the detection signal meets a preset condition or not, and outputs an enabling signal to the LED load module if the detection signal meets the preset condition, and the LED load module is lightened; if the preset condition is not met, the enabling signal is not output to the LED load module, and the LED load module is not lightened; the preset condition is that the time for which the detection signal is continuously at the high level is greater than a preset threshold value; at the moment when the LED driving circuit is started and the moment when the photosensitive sensing unit is sensitive to light, the detection signals are in disorder high and low levels, and the time for the detection signals to continuously be the high level is not greater than a preset threshold value, so that the LED load module cannot be lightened, and the LED load module cannot be immediately turned off, namely, flicker cannot be generated. Thus, the user experience is improved.
The LED driving circuit with the photosensitive inductive switch provided by the present application is described in detail above, and the principle and the implementation of the present application are explained herein by applying specific examples, and the description of the above examples is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. An LED driving circuit with a photosensitive inductive switch, the LED driving circuit with the photosensitive inductive switch comprising: the device comprises a rectification transformation module, a power supply module, a photosensitive induction control module and an LED load module;
the input end of the rectification transformation module is connected with external alternating current, and the output end of the rectification transformation module is connected with the LED load module, receives external alternating current input, and converts the external alternating current input into first direct current voltage output required by the LED load module;
the input end of the power supply module is connected with the rectification transformation module, the output end of the power supply module is connected with the photosensitive induction control module, and the power supply module receives a first direct current voltage output by the rectification transformation module and outputs a second direct current voltage required by the photosensitive induction control module;
the photosensitive induction control module comprises a photosensitive induction unit and a controller unit; the photosensitive sensing unit receives photosensitive sensing operation and outputs a detection signal; the controller unit is simultaneously connected with the photosensitive sensing unit and the LED load module, receives the detection signal output by the photosensitive sensing unit, judges whether the detection signal meets a preset condition or not, outputs an enabling signal to the LED load module if the detection signal meets the preset condition, and lights the LED load module; and if the preset condition is not met, the enabling signal is not output to the LED load module, and the LED load module is not lightened.
2. The LED driving circuit with the photosensitive inductive switch as claimed in claim 1, wherein the preset condition is that the time for which the detection signal is continuously high is greater than a preset threshold.
3. The LED driving circuit with the photo-sensitive switch as claimed in claim 2, wherein the detection signal is at a random high/low level at the moment when the LED driving circuit is turned on and the photo-sensitive unit is sensed.
4. The LED driving circuit with the photosensitive induction switch according to claim 2, wherein the rectification transformation module comprises a rectifier bridge, and a first input end of the rectifier bridge is connected with a zero line of the external alternating current through a first capacitor and a sixth resistor which are connected in parallel as a first end of an input end of the rectification transformation module; the second input end of the rectifier bridge is used as the second end of the input end of the rectification transformation module through a fuse and a switch which are connected in series, and is connected with the live wire of the external alternating current; the first output end of the rectifier bridge is connected with the second output end of the rectifier bridge through a first electrolytic capacitor, and is used as the first end of the output end of the rectification transformation module through a first resistor and is connected with the LED load module; and the second output end of the rectifier bridge is used as the second end of the output end of the rectification transformation module and is connected with the ground.
5. The LED driving circuit with the photosensitive induction switch as claimed in claim 4, wherein a first end of the output end of the rectification transformation module is connected to a second end of the output end of the rectification transformation module through a first zener diode.
6. The LED driving circuit with the photosensitive inductive switch according to claim 4, wherein the LED load module comprises a plurality of groups of LED strings connected in parallel and/or in series, anodes of the LED strings connected in parallel are connected together to form a common anode, cathodes of the LED strings connected in parallel are connected together to form a common cathode, the common anode is used as a first input end of the LED load module and is connected with a first end of an output end of the rectification transformation module through a second resistor, the common cathode is connected with a collector of a first triode, and an emitter of the first triode is used as a second input end of the LED load module and is connected with a second end of the output end of the rectification transformation module; and the base electrode of the first triode is used as a third input end of the LED load module, is connected with the controller unit of the photosensitive induction control module, and receives the enabling signal output by the controller unit.
7. The LED driving circuit with the photosensitive induction switch according to claim 6, wherein the power supply module comprises a power supply chip, a third end of the power supply chip is used as an input end of the power supply module, is connected with a first end of an output end of the rectification and transformation module, and is connected with the first end of the power supply chip through a second capacitor; the second end of the power supply chip is used as the output end of the power supply module and is connected with the first end of the power supply chip through a third capacitor; and the first end of the power supply chip is a grounding end and is connected with the ground.
8. The LED driving circuit with the photosensitive induction switch as claimed in claim 7, wherein the controller unit comprises a main control chip, a first end of the main control chip is a power supply end, is connected to the output end of the power supply module, and is connected to ground through a fourth capacitor; the second end of the main control chip is a detection end and is connected with the photosensitive induction unit; the fifth end of the main control chip is an output end and is connected with the third input end of the LED load module; and the eighth end of the main control chip is a grounding end and is connected with the ground.
9. The LED driving circuit with the photosensitive induction switch according to claim 8, wherein the photosensitive induction unit comprises a photosensitive induction chip, a first end of the photosensitive induction chip is connected to the output end of the power supply module, a second end of the photosensitive induction chip is connected to ground through a thirteenth resistor, and a second end of the photosensitive induction chip is connected to one end of a fourteenth resistor; the other end of the fourteenth resistor is connected with a base electrode of a second triode, a collector electrode of the second triode is used as an output end of the photosensitive induction unit, is connected with a second end of the main control chip and provides a detection signal for the main control chip, the collector electrode of the second triode is further connected with an output end of the power supply module through a fifteenth resistor, and an emitting electrode of the second triode is connected with the ground.
10. The LED driving circuit with the light-sensitive sensing switch as claimed in claim 9, wherein the model of the main control chip U3 is CS98P154CO, the model of the light-sensitive sensing chip U4 is UCS31061R, and the preset threshold in the preset condition is 500 ms.
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| CN114126137A (en) * | 2021-11-24 | 2022-03-01 | 欧普照明股份有限公司 | LED driving circuit with photosensitive inductive switch and method |
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| CN114126137A (en) * | 2021-11-24 | 2022-03-01 | 欧普照明股份有限公司 | LED driving circuit with photosensitive inductive switch and method |
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