Delay control circuit of radar induction lamp

Abstract

The utility model provides a delay control circuit of a radar induction lamp, and belongs to the technical field of lamps. The problems that an existing time-delay lamp cannot meet the requirements of people and is not high in humanization are solved. The delay control circuit of the radar induction lamp comprises a power supply input module used for obtaining power supply energy, a positive electrode interface used for being connected with a positive electrode of a lamp bead, and a negative electrode interface used for being connected with a negative electrode of the lamp bead. The radar module is used for sensing a human body signal and sequentially outputting PWM duty ratio signals with different ratios, and the driving module is used for controlling the lamp beads to be in a full-bright state within a preset time, to be in a half-bright state and to be in an off state within the preset time according to the PWM duty ratio signals output by the radar module. The power input module, the radar module and the cathode interface are connected with the driving module. According to the utility model, the light time-delay turn-off is more humanized.

Description

Technical Field

[0001] The utility model belongs to the technical field of lamps and relates to a delay control circuit of a radar induction lamp. Background Art

[0002] Most of the existing lighting in corridors of public places and stairs of residences are turned on or off by buttons. Sometimes you may need to grope in the dark to find the switch, which is very inconvenient to control. In addition, you may forget to turn off the lights, leaving the lamps on all the time, resulting in unnecessary waste of electricity.

[0003] With the advancement of science and technology and the improvement of the quality of life, people have higher and higher requirements for the control level of LED lighting. At present, lamps with induction delayed extinguishing function are beginning to appear, that is, the light turns on when a human body is detected, and the light turns off after the person leaves for a period of time. For example, a corridor LED lighting lamp based on radar sensing with Chinese patent application number 201811348334.2 can work when someone enters the radar sensing area in a dark place; the light emitting diode will continue to work if the person does not leave the radar sensing area, and the light emitting diode will automatically turn off after the person leaves, so that the light can be turned on when people come, and the light can be turned off after the delay, creating a truly comfortable, high-end, intelligent and energy-saving living environment for people. However, the light turns on and off at the same brightness and the delayed shutdown is relatively simple. When the light suddenly turns off before the person walks far away, it may cause dizziness to the eyes and easily cause accidents. Therefore, the existing delayed lamps are still insufficient and cannot meet people's needs, and are not highly humanized. Summary of the invention

[0004] The purpose of the utility model is to solve the above problems in the prior art and propose a delay control circuit for a radar sensing lamp. The actual technical problem to be solved is: how to make the delayed closing of the light more humane.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a delay control circuit of a radar sensing lamp, comprising a power input module for obtaining power supply energy, a positive electrode interface for connecting the positive electrode of a lamp bead, and a negative electrode interface for connecting the negative electrode of the lamp bead, the power input module is connected to the positive electrode interface, the delay control circuit also includes a radar module for sensing human body signals and sequentially outputting PWM duty cycle signals of different ratios, and 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 to an extinguished state according to the PWM duty cycle signal output by the radar module, the power input module, the radar module and the negative electrode interface are all connected to the driving module.

[0006] When the delay control circuit of the radar sensing lamp is in use, the mains 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, the voltage is output to the radar module. The radar module starts to work after being powered on. When the radar module senses the human body signal, it outputs a high level to the drive module. At this time, it outputs a 100% PWM duty cycle signal to the drive module, so that the drive module controls the lamp beads to light up. In order to improve the delay light-off effect, the delay light-off control instruction is preset in the radar module in advance. For example, it is set to output a 100% PWM duty cycle signal within the preset time, and output within the preset time. The PWM duty cycle signal of 50% is output, and then the delayed light-off control instruction of the PWM signal is stopped. The driving module controls the lamp beads to be fully lit for a preset time according to the PWM duty cycle signal of different ratios output by the radar module, and then turn to half bright, and then keep the half bright for a preset time and then turn off the light. In the half-bright state, if someone is sensed, the light is controlled to be fully bright again, and the light is turned off again according to the preset delayed light-off control instruction, ensuring that sufficient lighting can be provided when someone is walking, and the light is turned off after the person leaves, which saves energy and improves the humanization of delayed light shutdown, and can better meet people's requirements for the use of lamps.

[0007] In the above-mentioned delay control circuit of the radar sensing lamp, the driving module includes a driving chip U1, a driving chip U3 and a capacitor C2, the 8th pin of the driving chip U1 is connected to the power input module and the positive electrode interface respectively through a resistor R5, the 4th pin of the driving chip U1 is connected to the ground through a resistor R4, the 1st pin of the driving chip U1 is connected to the radar module and one end of the capacitor C2 respectively, the other end of the capacitor C2 is grounded, the 8th pin of the driving chip U3 is connected to the power input module through a resistor R5B, the 4th pin of the driving chip U3 is connected to the ground through a resistor R4B, the 2nd pin of the driving chip U1 is connected to the 2nd pin of the driving chip U3 and then connected to the radar module, and the 6th pin of the driving chip U1 is connected to the 6th pin of the driving chip U3 and then connected to the negative electrode interface. The number of driving chips in the driving module can be increased or decreased according to the power of the lamp beads to ensure the normal operation of the lamp beads. When working, the positive electrode interface is connected to the power input module to provide voltage. The driver chips U1 and U3 receive the PWM duty cycle signal transmitted by the radar module through their respective pins 2, and then output a low voltage through their respective pins 6, so that the negative electrode interface is in a low voltage state, and the power supply circuit of the lamp bead is connected and lit, so that the lamp is lit when people pass by, and is extinguished according to the preset delay method when people leave, thereby improving the use effect of the lamp.

[0008] In the above-mentioned delay control circuit of the radar sensing lamp, the power input module includes a rectifier bridge DB1 and a capacitor C1, and the 1st pin of the rectifier bridge DB1 is respectively connected to the driving module and the positive electrode interface, and the 1st pin of the rectifier bridge DB1 is also connected to the positive electrode of the capacitor C1, and the 2nd pin of the rectifier bridge DB1 is connected to the live wire interface L, and the 3rd pin of the rectifier bridge DB1 is connected to the neutral wire interface N through the resistor wire FR1, and the 4th pin 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 the capacitor C1 transmits the voltage to the driving module after filtering, providing working power for the delay control circuit, so that the lamp is lit when people come, and delayed closing is realized according to the full light or half light mode when people leave, thereby improving the effect of delayed closing of the lamp.

[0009] In the above-mentioned delay control circuit of the radar sensing lamp, the radar module includes a radar for sensing human body signals and a single-chip microcomputer for outputting PWM duty cycle signals of different ratios according to a preset delay light-off control instruction, the radar is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the driving module. Radar sensing has the characteristics of long sensing distance, large angle, high sensitivity, and the ability to penetrate non-metallic materials. During sensing, human body signals can be detected more accurately, which improves the use effect of automatic lighting and delayed light-off of lamps.

[0010] In the delay control circuit of the above radar sensing lamp, the delay control circuit also includes an ambient light sensor for sensing ambient light intensity signals, and the ambient light sensor is connected to the single-chip microcomputer in the radar module. The setting of the ambient light sensor can further optimize the use effect of the lamp, so that the lamp can automatically turn on the light when someone comes in the dark, and automatically delay the light off when the person leaves.

[0011] Compared with the prior art, the delay control circuit of the radar sensing lamp can control the lamp to light up when a person passes by according to the signal received by the radar module, and control the lamp to turn to half-brightness after a preset time of full brightness, and turn off after a preset time of half brightness to achieve automatic delayed shutdown when a person leaves. This saves energy and ensures that there is sufficient lighting when people leave. The process of turning off the lamp is transitional, which ensures that the environment will not suddenly change from a bright state to a dark state. People are more comfortable using the lamp, and the humanization of delayed light shutdown is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the circuit structure of the first embodiment of the utility model.

[0013] Figure 2 It is a schematic diagram of the circuit structure of the second embodiment of the utility model.

[0014] In the figure, 1. power input module; 2. positive electrode interface; 3. negative electrode interface; 4. drive module; 5. radar module; 51. radar; 52. single chip microcomputer; 6. ambient light sensor. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the implementation mode of the utility model will be further described in detail below in conjunction with the accompanying drawings. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the utility model and its application or use. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Embodiment 1:

[0017] like Figure 1 As shown, the delay control circuit of the radar sensing lamp includes a power input module 1 for obtaining power supply energy, a positive electrode interface 2 for connecting the positive electrode of the lamp bead, a negative electrode interface 3 for connecting the negative electrode of the lamp bead, a radar module 5 for sensing human body signals and sequentially outputting PWM duty cycle signals of different ratios, and a driving module 4 for controlling the lamp bead to maintain full brightness within a preset time, maintain half brightness within a preset time, and then to an extinguishing state according to the PWM duty cycle signal output by the radar module 5. The power input module 1 is connected to the positive electrode interface 2, and the power input module 1, the radar module 5 and the negative electrode interface 3 are all connected to the driving module 4.

[0018] Among them, the radar module 5 is integrated with a control chip for presetting the delayed light-off control instruction; the driving module 4 includes a driving chip U1, a driving chip U3 and a capacitor C2, the 4th pin of the driving chip U1 is connected to the ground through a resistor R4, the 9th pin of the driving chip U1 is grounded, the 1st pin of the driving chip U1 is connected to the 1st pin of the power supply terminal of the radar module 5, the 1st pin of the driving chip U1 is also connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, the 4th pin of the driving chip U3 is connected to the ground through a resistor R4B, the 3rd pin of the driving chip U1 and the 3rd pin of the driving chip U3 are both grounded, the 2nd pin of the driving chip U1 and the 2nd pin of the driving chip U3 are connected to the 2nd pin of the control terminal of the radar module 5, and the 6th pin of the driving chip U1 and the 6th pin of the driving chip U3 are connected to the negative electrode interface 33. The driving chip U1 and the driving chip U3 can choose the chip model MT7653.

[0019] The power input module 1 includes a capacitor C1 and a rectifier bridge DB1 composed of four diodes. Pin 1 of the rectifier bridge DB1 is connected to the positive electrode interface 2, and pin 1 of the rectifier bridge DB1 is also connected to the positive electrode of the capacitor C1. Pin 1 of the rectifier bridge DB1 is also connected to pin 8 of the driver chip U1 in the driver module 4 through a resistor R5, and is connected to pin 8 of the driver chip U3 in the driver module 4 through a resistor R5B, which is used to start the driver chip U1 and the driver chip U3. Pin 2 of the rectifier bridge DB1 is connected to the live wire interface L, and pin 3 of the rectifier bridge DB1 is connected to the neutral wire interface N through a resistor FR1. Pin 4 of the rectifier bridge DB1 and the negative electrode of the capacitor C1 are both grounded.

[0020] When the delay control circuit of the radar sensing lamp is applied to the lamp, the AC power is connected to the live wire interface L and the neutral wire interface N in the power input module 1. After the AC power is rectified and filtered by the power input module 1, it is transmitted to the 8th pin of the driver chip U1 and the driver chip U3 after current limiting by the resistor R5 and the resistor R5B. After the 8th pin of the driver chip U1 and the driver chip U3 reaches 30V, the driver chip U1 and the driver chip U3 are started. Pin 1 of driver chip U1 outputs 5V voltage to pin 1 of radar module 5, providing power supply for radar module 5. After power is supplied, radar module 5 starts to sense the personnel information in the area. When sensing the personnel information, pin 2 of radar module 5 outputs PWM duty cycle signal to pin 2 of driver chip U1 and pin 2 of driver chip U3. After driver chip U1 and driver chip U3 receive the signal, pin 6 of driver chip U1 and pin 6 of driver chip U3 output low voltage, and the lamp bead lights up. In order to improve the delayed light-off effect, the radar module 5 has preset delayed light-off control instructions, such as setting it to be on at the preset time. The radar module 5 outputs a 100% PWM duty cycle signal, outputs a 50% PWM duty cycle signal within a preset time, and then stops outputting the delayed light-off control instruction of the PWM signal. The radar module 5 outputs PWM duty cycle signals of different ratios according to the preset delayed light-off control instruction. The driver chip U1 and the driver chip U3 control the lamp beads to be fully lit for a preset time, then turn to half-brightness, and then keep the half-brightness for a preset time before the lamp is turned off. The preset time can be set to 5 minutes, or other times, such as 3 minutes, 6 minutes, etc. In the half-bright state, if someone is sensed, the light is controlled to be fully lit again, and the light is turned off again according to the preset delayed light-off control instruction, ensuring that sufficient lighting can be provided when someone is walking, and when the person leaves, the light is turned off after the light is reduced, rather than suddenly dimming, causing discomfort, which saves energy and meets people's requirements for delayed light-off of lamps, with a higher degree of humanization.

[0021] Embodiment 2:

[0022] like Figure 2As shown, the technical solution in this embodiment is basically the same as the technical solution in embodiment one, except that the radar module 5 includes a radar 51 for sensing human body signals and a single-chip microcomputer 52 for outputting PWM duty cycle signals of different ratios according to a preset delayed light-off control instruction, the radar 51 is connected to the input end of the single-chip microcomputer 52, and the output end of the single-chip microcomputer 52 is connected to the driving module 4.

[0023] The delay control circuit also includes an ambient light sensor 6 for sensing an ambient light intensity signal, and the ambient light sensor 6 is connected to the single chip microcomputer 52 in the radar module 5. The setting of the ambient light sensor 6 can further optimize the use effect of the lamp, so that the lamp can automatically turn on the light when someone comes in the dark, and automatically delay the light off when the person leaves.

[0024] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A delay control circuit for a radar sensing lamp, comprising 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, wherein the power input module (1) is connected to the positive electrode interface (2), and is characterized in that: The delay control circuit further comprises a radar module (5) for sensing human body signals and sequentially outputting PWM duty cycle signals of different ratios, and a drive module (4) 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 signals output by the radar module (5); the power input module (1), the radar module (5), and the cathode interface (3) are all connected to the drive module (4).

2. The delay control circuit of the radar sensing lamp according to claim 1, characterized in that: The driving module (4) 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 radar module (5) 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 radar module (5). 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).

3. The delay control circuit of the radar sensing lamp according to claim 1, 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 (4) 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.

4. The delay control circuit of the radar sensing lamp according to claim 1, 2 or 3, characterized in that: The radar module (5) comprises a radar (51) for sensing human body signals and a single-chip computer (52) for outputting PWM duty cycle signals of different ratios according to a preset delayed light-off control instruction, the radar (51) being connected to an input end of the single-chip computer (52), and an output end of the single-chip computer (52) being connected to a driving module (4).

5. The delay control circuit of the radar sensing lamp according to claim 4, characterized in that: The delay control circuit also includes an ambient light sensor (6) for sensing an ambient light intensity signal, and the ambient light sensor (6) is connected to a single-chip microcomputer (52) in the radar module (5).

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