Delay control circuit of infrared induction lamp

Abstract

The utility model provides a delay control circuit of an infrared induction lamp, and belongs to the technical field of lamps. The problem that the existing lamp is relatively single in light delay turn-off time and cannot meet the requirements of people is solved. The delay control circuit of the infrared induction lamp comprises an infrared sensor PIR, a power supply input module, a positive electrode interface, a negative electrode interface and a control module used for sequentially outputting PWM duty ratio signals with different ratios according to signals detected by the infrared sensor PIR. The control module is connected with a driving module which is used for controlling the lamp beads to be in a full-bright state within a preset time according to a PWM duty ratio signal output by the control module and to be in a half-bright state within the preset time, the power supply input module is connected with the positive electrode interface and the driving module, and the negative electrode interface is connected with the driving module. The driving module is connected with a voltage reduction module used for providing electric energy for the infrared sensor PIR and the control module. According to the utility model, the light time-delay illumination effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lamps, and relates to a delay control circuit for an infrared induction lamp. Background Technique

[0002] A pyroelectric infrared sensor (PIR sensor) receives infrared rays with a specific wavelength radiated by a moving human body and converts them into low-frequency electrical signals related to the moving speed, distance, and direction of the human body. Due to its low device power consumption, low cost, and strong concealment, it is widely used in various fields, especially in the field of lamps, and is used in public places such as corridors, roadsides, and parks that require automatic lighting to achieve automatic lighting when people come and automatic extinguishing when people leave.

[0003] Currently, most infrared induction lamps have a delay extinguishing function, that is, the lamp lights up when a human body is detected and extinguishes after a period of time when the person leaves. For example, a landscape area infrared detection delay full-brightness and half-brightness energy-saving street lamp with a Chinese patent application number of 201610127394.6 realizes signal delay through a switching diode D1, a resistor R3, an electrolytic capacitor C3, and an enhanced N-channel MOSFET VT2. However, users have different requirements for the lamp light delay-off time in various environments. Although the above solution can effectively save resources, the lamp light delay-off time is relatively single and cannot meet people's requirements for lamp use. Summary of the Invention

[0004] The purpose of the utility model is to address the above problems existing in the prior art and propose a delay control circuit for an infrared induction lamp. The actual technical problem to be solved is: how to improve the effect of lamp delay lighting.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A delay control circuit for an infrared induction lamp includes an infrared sensor PIR, a power input module for obtaining a power supply, a positive electrode interface for connecting to the positive electrode of the lamp bead, and a negative electrode interface for connecting to the negative electrode of the lamp bead. The delay control circuit further includes a control module for sequentially outputting PWM duty cycle signals with different ratios according to the signals detected by the infrared sensor PIR. The control module is connected to a driving module for controlling the lamp bead to maintain full brightness within a preset time, maintain half brightness within a preset time, and then turn off according to the PWM duty cycle signal output by the control module. The power input module is respectively connected to the positive electrode interface and the driving module, the negative electrode interface is connected to the driving module, and the driving module is connected to a buck module for supplying power to the infrared sensor PIR and the control module.

[0006] When the delay control circuit of this infrared induction lamp is in use, the mains power is connected to the power input module, and the converted voltage is transmitted to the drive module through the power input module. After the drive module is started, it outputs voltage to the buck module. After being stepped down by the buck module, it supplies power to the infrared sensor PIR and the control module. After being powered on, the infrared sensor PIR and the control module start to work. When the control module receives the human body signal sensed by the infrared sensor PIR, it outputs a high level to the drive module. At this time, a PWM duty cycle signal with 100% duty cycle is output to the drive module, so that the drive module controls the lamp beads to light up. In order to improve the effect of delayed lamp extinguishing, the delayed lamp extinguishing method can be preset in the control module in advance, such as setting to output a PWM duty cycle signal with 100% duty cycle within a preset time, output a PWM duty cycle signal with 50% duty cycle within a preset time, and then stop outputting the PWM signal. The drive module controls the lamp beads to be fully lit for a preset time according to the PWM duty cycle signals with different ratios output by the control module, then turns to half-bright, and then maintains the half-bright state for a preset time and then the lamp goes out. In the half-bright state, if a person is sensed, the lamp is controlled to become fully bright again, and the lamp is extinguished again according to the preset delayed lamp extinguishing method, ensuring that sufficient lighting can be provided when someone is walking, and the light is reduced and then extinguished when the person leaves, which not only saves energy but also improves the effect of delayed lighting of the lamp and improves the usage effect of the lamp by people.

[0007] In the above-mentioned delay control circuit of the infrared induction lamp, the control module is also connected with a photosensitive diode D1 for sensing the ambient light condition. The positive pole of the photosensitive diode D1 is connected to the buck module, and the negative pole of the photosensitive diode D1 is connected to the control module. The photosensitive diode D1 can change the current in the circuit according to the intensity of light. Through the setting of the photosensitive diode D1, the usage effect of the lamp can be further optimized to ensure that the lamp is only turned on when the ambient light is relatively dim.

[0008] In the above-mentioned delay control circuit of the infrared induction lamp, the control module includes a control chip U2, a resistor R2A, a resistor R3A, a resistor R4A, a resistor R5A, and a resistor R6A. One end of the resistor R2A and one end of the resistor R3A are both connected to the buck module. The other end of the resistor R2A is respectively connected to one end of the resistor R6A and the 4th pin of the control chip U2. The 5th pin of the control chip U2 is respectively connected to the other end of the resistor R3A and one end of the resistor R5A. The other end of the resistor R5A is grounded. The 2nd pin of the control chip U2 is connected to the drive module through the resistor R1A. The infrared sensor PIR is connected to the 7th pin of the control chip U2. The negative electrode of the photosensitive diode D1 is connected to the 6th pin of the control chip U2. The 6th pin of the control chip U2 is grounded through the resistor R4A. The control chip U2 receives the signal transmitted by the infrared sensor PIR through the 7th pin, and outputs a PWM signal to the drive module through the 2nd pin, so that the drive module drives the lamp beads to light up or go out, realizing that the lamp lights up when a person comes, and goes out according to the preset delay mode when a person leaves.

[0009] In the above-mentioned delay control circuit of the infrared induction lamp, the drive module includes a drive chip U1, a drive chip U3, and a capacitor C2. The 8th pin of the drive chip U1 is respectively connected to the power input module and the positive electrode interface through the resistor R5. The 4th pin of the drive chip U1 is connected to the ground through the resistor R4. The 1st pin of the drive chip U1 is respectively connected to the buck module and one end of the capacitor C2. The other end of the capacitor C2 is grounded. The 8th pin of the drive chip U3 is connected to the power input module through the resistor R5B. The 4th pin of the drive chip U3 is connected to the ground through the resistor R4B. The 2nd pin of the drive chip U1 and the 2nd pin of the drive chip U3 are connected and then connected to the control module. The 6th pin of the drive chip U1 and the 6th pin of the drive chip U3 are connected and then connected to the negative electrode interface. The number of drive chips in the drive module can be increased or decreased according to the power of the lamp beads to ensure the normal operation of the lamp beads. During operation, the positive electrode interface is connected to the power input module to provide voltage. The drive chips U1 and U3 receive the PWM duty cycle signal transmitted by the control module through their respective 2nd pins, and then output a low voltage through their respective 6th pins, so that the negative electrode interface is in a low voltage state, and the power supply circuit of the lamp beads is turned on to light up, realizing that when a person passes by, the lamp lights up, and when a person leaves, it goes out according to the preset delay mode, improving the use effect of the lamp.

[0010] In the above-mentioned delay control circuit of the infrared induction lamp, the buck module includes a buck chip LDO, a capacitor C1A, a capacitor C2A and a capacitor C3. The pin 3 of the buck chip LDO is connected to the driving module, and the pin 3 of the buck chip LDO is also grounded through the capacitor C1A. The pin 2 of the buck chip LDO outputs a voltage VCC for supplying power to the infrared sensor PIR and the control module. The pin 2 of the buck chip LDO is also grounded after being connected in parallel with the capacitor C2A and the capacitor C3. The voltage output by the driving module is stepped down by the buck chip LDO and used to supply working power to the infrared sensor PIR and the control module.

[0011] In the above-mentioned delay control circuit of the infrared induction lamp, the power input module includes a rectifier bridge DB1 and a capacitor C1. The pin 1 of the rectifier bridge DB1 is respectively connected to the driving module and the positive electrode interface. The pin 1 of the rectifier bridge DB1 is also connected to the positive electrode of the capacitor C1. The pin 2 of the rectifier bridge DB1 is connected to a live wire interface L. The pin 3 of the rectifier bridge DB1 is connected to a neutral wire interface N through a resistance wire FR1. The pin 4 of the rectifier bridge DB1 and the negative electrode of the capacitor C1 are both grounded. The alternating current is rectified by the rectifier bridge and filtered by the capacitor C1, and then the voltage is supplied to the driving module to provide working power for this delay control circuit, realizing that the lamp lights up when people come and is turned off with a delay according to the full-brightness or half-brightness mode when people leave, improving the effect of the lamp's delayed turn-off.

[0012] Compared with the prior art, the delay control circuit of this infrared induction lamp can control the lamp to light up when a person passes by according to the signal received by the infrared sensor, and control the lamp to turn from full brightness to half brightness after a preset full-brightness time, and turn off after a preset half-brightness time, so as to realize automatic delayed turn-off when a person leaves. This not only saves energy but also ensures that there is enough lighting when a person leaves, effectively improving the effect of the lamp's delayed lighting. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the circuit structure of the present invention.

[0014] In the figure, 1. Power input module; 2. Positive electrode interface; 3. Negative electrode interface; 4. Control module; 5. Driving module; 6. Buck module. Detailed Embodiment

[0015] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0016] As Figure 1 shown, the delay control circuit of this infrared induction lamp includes an infrared sensor PIR, a power input module 1 for obtaining power supply, a photosensitive diode D1 for sensing the ambient light condition, a buck module 6 for supplying power to the infrared sensor PIR and the control module 4, a positive electrode interface 2 for connecting to the positive electrode of the lamp bead, a negative electrode interface 3 for connecting to the negative electrode of the lamp bead, a control module 4 for sequentially outputting PWM duty cycle signals with different ratios according to the signals detected by the infrared sensor PIR, and a driving module 5 for controlling the lamp bead to maintain full brightness within a preset time, maintain half brightness within a preset time, and then turn off according to the PWM duty cycle signal output by the control module 4.

[0017] Among them, the power input module 1 includes a capacitor C1 and a rectifier bridge DB1 composed of four diodes. The pin 1 of the rectifier bridge DB1 is connected to the positive electrode interface 2, the pin 1 of the rectifier bridge DB1 is also connected to the positive electrode of the capacitor C1, the pin 1 of the rectifier bridge DB1 is also connected to the pin 8 of the driving chip U1 in the driving module 5 through a resistor R5, and is connected to the pin 8 of the driving chip U3 in the driving module 5 through a resistor R5B, for starting the driving chip U1 and the driving chip U3. The pin 2 of the rectifier bridge DB1 is connected to a live wire interface L, the pin 3 of the rectifier bridge DB1 is connected to a neutral wire interface N through a resistance wire FR1, and the pin 4 of the rectifier bridge DB1 and the negative electrode of the capacitor C1 are both grounded.

[0018] The driving module 5 includes a driving chip U1, a driving chip U3 and a capacitor C2. The pin 4 of the driving chip U1 is connected to the ground through a resistor R4, the pin 9 of the driving chip U1 is grounded, the pin 1 of the driving chip U1 is connected to the pin 3 of the buck chip LDO in the buck module 6, the pin 1 of the driving chip U1 is also connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded. The pin 4 of the driving chip U3 is connected to the ground through a resistor R4B, the pins 3 of the driving chip U1 and the driving chip U3 are both grounded, the pins 2 of the driving chip U1 and the driving chip U3 are connected and then connected to the control module 4, and the pins 6 of the driving chip U1 and the driving chip U3 are connected and then connected to the negative electrode interface 3. The driving chips U1 and U3 can be chips of model MT7653.

[0019] The buck module 6 includes a buck chip LDO, capacitors C1A, C2A and C3. The pin 3 of the buck chip LDO is grounded through the capacitor C1A, the pin 2 of the buck chip LDO outputs a voltage VCC for supplying power to the infrared sensor PIR and the control module 4, and the pin 2 of the buck chip LDO is also grounded through the capacitors C2A and C3 connected in parallel.

[0020] The control module 4 includes a control chip U2, a resistor R2A, a resistor R3A, a resistor R4A, a resistor R5A, and a resistor R6A. One end of the resistor R2A, one end of the resistor R3A, and the pin 1 of the control chip U2 are all connected to the pin 2 of the step-down chip LDO. The other end of the resistor R2A is respectively connected to one end of the resistor R6A and the pin 4 of the control chip U2. The other end of the resistor R6A is grounded. The pin 5 of the control chip U2 is respectively connected to the other end of the resistor R3A and one end of the resistor R5A. The other end of the resistor R5A is grounded. The pin 2 of the control chip U2 is respectively connected to the pin 2 of the drive chip U1 and the pin 2 of the drive chip U3 through the resistor R1A. The S pin of the infrared sensor PIR is connected to the pin 7 of the control chip U2. The negative electrode of the photosensitive diode D1 is connected to the pin 6 of the control chip U2. The positive electrode of the photosensitive diode D1 is connected to the pin 2 of the step-down chip LDO. The pin 6 of the control chip U2 is also grounded through the resistor R4A. The D pin of the infrared sensor PIR is connected to the pin 2 of the step-down chip LDO. The D pin of the infrared sensor PIR is also connected to the G pin of the infrared sensor PIR through the capacitor C4A. The G pin of the infrared sensor PIR is also grounded. In this embodiment, the control chip U2 can be a chip of model AS050H.

[0021] When the delay control circuit of this infrared induction lamp is applied to a lamp, the alternating current is connected to the live wire interface L and the neutral wire interface N in the power input module 1. After the alternating current is rectified and filtered by the power input module 1, it is input to the 8th pins of the driving chips U1 and U3 after being limited in current by the resistor R5 and the resistor R5B. When the 8th pins of the driving chips U1 and U3 reach 30V, the driving chips U1 and U3 are started. The 1st pin of the driving chip U1 outputs a 5V voltage to the buck module 6. The buck module 6 steps down the 5V voltage to a 2.5V voltage VCC to provide power for the infrared sensor PIR and the control module 4. After each component is powered on, it starts to work. The infrared sensor PIR detects the personnel information and transmits it to the 7th pin of the control chip U2. The photosensitive diode D1 transmits the ambient light condition to the 6th pin of the control chip U2. When the control chip U2 receives that the ambient light is relatively dim and the 7th pin of the control chip U2 receives the human body signal sensed by the infrared sensor PIR, it outputs a high level to the driving module 5. At this time, a PWM duty cycle signal of 100% is output to the 2nd pins of the driving chips U1 and U3. The 6th pins of the driving chips U1 and U3 output a low voltage, and the lamp beads are lit. In order to improve the effect of delayed lamp extinguishing, a delayed lamp extinguishing method is preset in the control chip U2 in advance, such as setting to output a PWM duty cycle signal of 100% within a preset time, output a PWM duty cycle signal of 50% within a preset time, and then stop outputting the PWM signal for the delayed lamp extinguishing method. The control chip U1 outputs PWM duty cycle signals with different ratios according to the preset delayed lamp extinguishing method. The driving chips U1 and U3 control the lamp beads to be fully lit for a preset time according to the PWM duty cycle signals with different ratios output by the control chip U2, then turn to be half lit, and then maintain the half lit state for a preset time and then the lamp goes out. The preset time can be set to 5min, or it can be set to other times, such as 3min, 6min, etc. In the half lit state, if a person is sensed, the lamp is controlled to become fully lit again, and the lamp is extinguished again according to the preset delayed lamp extinguishing method, ensuring that sufficient lighting can be provided when someone is walking, and the light is reduced and extinguished when a person leaves, which not only saves energy but also improves the effect of the lamp's delayed lighting and the effect of people using the lamp.

[0022] The specific embodiments described in this article are only examples to illustrate the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A time delay control circuit for an infrared sensing lamp, comprising an infrared sensor PIR, a power input module (1) for obtaining power supply energy, a positive electrode interface (2) for connecting the positive electrode of a lamp bead, and a negative electrode interface (3) for connecting the negative electrode of the lamp bead, characterized in that: The delay control circuit further comprises a control module (4) for sequentially outputting PWM duty cycle signals of different ratios according to a signal detected by the infrared sensor PIR; the control module (4) is connected to a drive module (5) for controlling the lamp beads to maintain full brightness within a preset time, maintain half brightness within a preset time, and then turn off according to the PWM duty cycle signal output by the control module (4); the power input module (1) is respectively connected to the positive electrode interface (2) and the drive module (5); the negative electrode interface (3) is connected to the drive module (5); and the drive module (5) is connected to a step-down module (6) for providing electric energy to the infrared sensor PIR and the control module (4).

2. The delay control circuit of the infrared induction lamp according to claim 1, characterized in that: The control module (4) is also connected to a photosensitive diode D1 for sensing ambient light conditions, the positive electrode of the photosensitive diode D1 is connected to the voltage reduction module (6), and the negative electrode of the photosensitive diode D1 is connected to the control module (4).

3. The delay control circuit of the infrared induction lamp according to claim 2, characterized in that: The control module (4) comprises a control chip U2, a resistor R2A, a resistor R3A, a resistor R4A, a resistor R5A and a resistor R6A, one end of the resistor R2A and one end of the resistor R3A are both connected to the step-down module (6), the other end of the resistor R2A is respectively connected to one end of the resistor R6A and pin 4 of the control chip U2, pin 5 of the control chip U2 is respectively connected to the other end of the resistor R3A and one end of the resistor R5A, the other end of the resistor R5A is grounded, pin 2 of the control chip U2 is connected to the drive module (5) via a resistor R1A, the infrared sensor PIR is connected to pin 7 of the control chip U2, the cathode of the photosensitive diode D1 is connected to pin 6 of the control chip U2, and pin 6 of the control chip U2 is grounded via a resistor R4A.

4. The delay control circuit of the infrared induction lamp according to claim 1, 2 or 3, characterized in that: The driving module (5) comprises a driving chip U1, a driving chip U3 and a capacitor C2. Pin 8 of the driving chip U1 is respectively connected to the power input module (1) and the positive electrode interface (2) via a resistor R5. Pin 4 of the driving chip U1 is connected to the ground via a resistor R4. Pin 1 of the driving chip U1 is respectively connected to the step-down module (6) and one end of the capacitor C2. The other end of the capacitor C2 is grounded. Pin 8 of the driving chip U3 is connected to the power input module (1) via a resistor R5B. Pin 4 of the driving chip U3 is connected to the ground via a resistor R4B. Pin 2 of the driving chip U1 is connected to pin 2 of the driving chip U3 and then connected to the control module (4). Pin 6 of the driving chip U1 is connected to pin 6 of the driving chip U3 and then connected to the negative electrode interface (3).

5. The delay control circuit of the infrared induction lamp according to claim 1, 2 or 3, characterized in that: The step-down module (6) comprises a step-down chip LDO, a capacitor C1A, a capacitor C2A and a capacitor C3. Pin 3 of the step-down chip LDO is connected to the driving module (5). Pin 3 of the step-down chip LDO is also grounded via the capacitor C1A. Pin 2 of the step-down chip LDO outputs a voltage VCC for providing electric energy to the infrared sensor PIR and the control module (4). Pin 2 of the step-down chip LDO is also grounded via the capacitors C2A and C3 connected in parallel.

6. The delay control circuit of the infrared induction lamp according to claim 1, 2 or 3, characterized in that: The power input module (1) comprises a rectifier bridge DB1 and a capacitor C1, wherein pin 1 of the rectifier bridge DB1 is respectively connected to the drive module (5) and the positive electrode interface (2), pin 1 of the rectifier bridge DB1 is also connected to the positive electrode of the capacitor C1, pin 2 of the rectifier bridge DB1 is connected to a live wire interface L, pin 3 of the rectifier bridge DB1 is connected to a neutral wire interface N via a resistor wire FR1, and pin 4 of the rectifier bridge DB1 and the negative electrode of the capacitor C1 are both grounded.

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