Circuit for preventing repeated triggering caused by light interference when PIR lamp is turned off

Abstract

The utility model discloses a circuit for preventing repeated triggering caused by light interference when a PIR lamp is turned off, the circuit comprises a data processing module, a PIR probe module and an LED driving module, the LED driving module is connected with a light source module, and the PIR probe module and the LED driving module are respectively connected with the data processing module. The signal of the PIR probe module is identified through the data processing module, and when the light source module is turned off, the sensitivity of the PIR probe module is reduced to the minimum and kept for 2 seconds, so that the PIR probe module is not interfered by lamplight within 2 seconds after the lamp is turned off, the PIR probe module is not turned on again, meanwhile, the PIR probe module can be triggered again after 2 seconds, and the use experience is improved; the data processing module 1 comprises a chip U3, the model of the chip U3 is PL51T020, PWM dimming signals are output through the chip U3, the light source module is turned off from bright in a gradual change mode, and infrared signal changes caused by light changes are reduced to the maximum extent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PIR control technical field, concretely relates to a circuit that prevents PIR lamp light interference from causing repeated triggering when the light is off. BACKGROUND

[0002] The PIR control circuit in the current industry detects the heat radiation of human bodies or other objects and triggers a signal when detecting the change of the radiation. When a person or object moves into the sensing range of the sensor, it will cause the change of the surrounding infrared radiation level. The change of the radiation level is detected to determine whether to trigger. This method has the following disadvantages:

[0003] 1. The change of the infrared radiation signal also occurs during the process of the light changing from bright to off, and the signal is similar to the human body radiation level, so the light will be turned on again after being off;

[0004] 2. Some circuits filter the light interference by increasing the latch time of the PIR sensor, that is, the light cannot be triggered again for a period of time after being off, even more than 5 seconds. The long latch time will cause the poor use effect of the customer and the abnormal function. INVENTION CONTENT

[0005] The utility model aims at providing a circuit that prevents PIR lamp light interference from causing repeated triggering when the light is off to solve the problems in the background technology. The utility model provides a circuit that prevents PIR lamp light interference from causing repeated triggering when the light is off, which can prevent the light from turning on immediately after being off and can be triggered again after two seconds of being off.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a circuit that prevents PIR lamp light interference from causing repeated triggering when the light is off, comprising a data processing module, a PIR probe module and an LED driving module, wherein the LED driving module is connected with a light source module, and the PIR probe module and the LED driving module are connected with the data processing module respectively.

[0007] To convert the 5V voltage into a 3.3V voltage to supply power to the data processing module 1 and the PIR probe module 2, further, it further comprises a linear voltage stabilizing module, the input end of the linear voltage stabilizing module is connected with the LED driving module, and the output end of the linear voltage stabilizing module is connected with the data processing module and the PIR probe module respectively. The linear voltage stabilizing module comprises a chip U2, and the model of the chip U2 is SOT23-3.

[0008] In order to output the PWM dimming signal, the light source module 3 is changed from bright to dark in a gradual manner, the infrared signal change caused by light change is reduced to the maximum extent, further, the data processing module comprises a chip U3, and the model of the chip U3 is PL51T020.

[0009] In the utility model further, the LED drive module comprises an AC-DC drive circuit.

[0010] In order to provide illumination, further, the light source module comprises a plurality of LED lamp beads connected in series or / and in parallel.

[0011] In the utility model further, the PIR probe module comprises a PIR probe, the model of the PIR probe is D220AX, the VDD pin of the PIR probe is connected with the linear voltage stabilizing module, the SIGN pin of the PIR probe is connected with the data processing module, and the VSS pin of the PIR probe module is connected with the GND end.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1, the utility model discloses a data processing module to the signal of PIR probe module is identified, when the light source module is extinguished, the sensitivity of PIR probe module is reduced to the minimum, and keeps 2 seconds, makes PIR probe module in 2 seconds in extinguishing the light and will not be interfered with the light, causes to light up again, can be triggered again after 2 seconds, improves the use experience;

[0014] 2, the utility model discloses data processing module 1 including chip U3, and the model of chip U3 is PL51T020, and the PWM dimming signal is output through chip U3, and the light source module is changed from bright to dark in a gradual manner, and the infrared signal change caused by light change is reduced to the maximum extent. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is the circuit diagram of the utility model;

[0016] Fig. 2 It is the circuit diagram of the utility model.

[0017] In the drawing, 1, data processing module;2, PIR probe module;3, light source module;4, LED drive module;5, linear voltage stabilizing module. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present utility model.

[0019] Embodiment 1

[0020] Please refer to Figs. 1-2 The utility model provides the following technical scheme: a circuit for preventing light interference from causing repeated triggering when a PIR lamp is turned off, comprising a data processing module 1, a PIR probe module 2 and an LED driving module 4, wherein the LED driving module 4 is connected with a light source module 3, the PIR probe module 2 and the LED driving module 4 are respectively connected with the data processing module 1, and the LED driving module 4 comprises an AC-DC driving circuit.

[0021] By adopting the above technical scheme, the utility model discloses that the data processing module 1 identifies the signal of the PIR probe module 2, and when the light source module 3 is turned off, the sensitivity of the PIR probe module 2 is reduced to the minimum and maintained for 2 seconds, so that the PIR probe module 2 will not be interfered by light within 2 seconds after the lamp is turned off, causing the lamp to light up again, and meanwhile the PIR probe module 2 can be triggered again after 2 seconds, thereby improving the use experience.

[0022] Specifically, it further comprises a linear voltage stabilizing module 5, the input end of the linear voltage stabilizing module 5 is connected with the LED driving module 4, and the output end of the linear voltage stabilizing module 5 is respectively connected with the data processing module 1 and the PIR probe module 2. The linear voltage stabilizing module 5 comprises a chip U2, and the model of the chip U2 is SOT23-3.

[0023] By adopting the above technical scheme, the 5V voltage is converted into a 3.3V voltage to supply power to the data processing module 1 and the PIR probe module 2.

[0024] Specifically, the light source module 3 comprises a plurality of LED lamp beads connected in series or / and parallel.

[0025] By adopting the above technical scheme, the light source module 3 is used to provide illumination.

[0026] Specifically, the PIR probe module 2 comprises a PIR probe, the model of the PIR probe is D220AX, the VDD pin of the PIR probe is connected with the linear voltage stabilizing module 5, the SIGN pin of the PIR probe is connected with the data processing module 1, and the VSS pin of the PIR probe module 2 is connected with the GND end.

[0027] Embodiment 2

[0028] The embodiment differs from the embodiment 1 in that specifically, the data processing module 1 comprises a chip U3, and the model of the chip U3 is PL51T020.

[0029] By adopting the technical scheme, the PWM dimming signal is output by the chip U3, the light source module 3 is changed from bright to off in a gradual manner, and the infrared signal change caused by the light change is reduced to the maximum extent.

[0030] Embodiment 3

[0031] The embodiment differs from the embodiment 1 in that specifically, the light source module 3 comprises a plurality of LED lamp beads connected in parallel.

[0032] By adopting the technical scheme, the PWM dimming signal is output by the chip U3, the light source module 3 is changed from bright to off in a gradual manner, and the infrared signal change caused by the light change is reduced to the maximum extent.

[0033] By adopting the technical scheme, the PWM dimming signal is output by the chip U3, the light source module 3 is changed from bright to off in a gradual manner, and the infrared signal change caused by the light change is reduced to the maximum extent.

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A circuit for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: It includes a data processing module, a PIR probe module, and an LED driver module. The LED driver module is connected to the light source module, and the PIR probe module and the LED driver module are respectively connected to the data processing module.

2. The circuit according to claim 1 for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: It also includes a linear voltage regulator module, whose input is connected to the LED driver module, and whose output is connected to the data processing module and the PIR probe module, respectively.

3. The circuit according to claim 2 for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: The linear voltage regulator module includes chip U2, which is model SOT23-3.

4. The circuit according to claim 1 for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: The data processing module includes a chip U3, model number PL51T020.

5. The circuit according to claim 1 for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: The LED driver module includes an AC-DC driver circuit.

6. The circuit according to claim 1 for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: The light source module includes several LED beads connected in series and / or in parallel.

7. The circuit according to claim 1 for preventing repeated triggering due to light interference when a PIR lamp is turned off, characterized in that: The PIR probe module includes a PIR probe, model D220AX. The VDD pin of the PIR probe is connected to the linear voltage regulator module, the SIGN pin of the PIR probe is connected to the data processing module, and the VSS pin of the PIR probe module is connected to the GND terminal.

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