A microwave warning drive circuit and lamp

Abstract

The present application belongs to the technical field of lamps, and provides a microwave warning drive circuit and a lamp. A zero-crossing detection circuit is used to perform zero-crossing detection on a first direct current output by an alternating current power supply, and a zero-crossing detection signal is generated to a control circuit. The microwave circuit collects microwave sensing signals, and the photosensitive circuit collects ambient light sensing signals. The control circuit generates a main light source drive signal and a warning light source drive signal based on the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal. The chopping time point of the main light source drive signal is consistent with the chopping time point of the zero-crossing detection signal, so that the extinction time point of the main light source is consistent with the chopping time point of the zero-crossing detection signal, thereby preventing the ambient light sensing signal collected by the photosensitive circuit from being affected by the light emission of the lamp itself, and solving the problem that microwave induction lamps with light sensing on the market cannot shield their own light, and can only detect ambient light when their own light is extinguished.

Description

Technical Field

[0001] The present application belongs to the technical field of lamps, and in particular, relates to a microwave warning drive circuit and a lamp. Background Art

[0002] Microwave induction lamps have been widely used in the market due to their excellent performance. Existing microwave induction lamps transmit electromagnetic waves through a planar antenna. When a moving object enters the electromagnetic wave environment, the waveform is reflected back. When the planar antenna receives the feedback waveform, the subsequent circuit detects the trigger signal to control the induction lamp to light up.

[0003] Currently, microwave induction lamps with light sensing on the market cannot shield their own light. They can only detect ambient light when their own light is off. For example, when someone walks over in a dark environment, the light is on. If the environment suddenly becomes brighter at this time, the light is still on and will not go out. Summary of the invention

[0004] The purpose of the present application is to provide a microwave warning driving circuit and a lamp, aiming to solve the problem that microwave induction lamps with light sensing on the market cannot shield their own light and can only detect ambient light when their own light is extinguished.

[0005] A first aspect of an embodiment of the present application provides a microwave warning driving circuit, which is connected to a main light source and a warning light source respectively, and the microwave warning driving circuit includes:

[0006] A rectifier and filter circuit, used for connecting to an AC power source and converting the AC power provided by the AC power source into a plurality of DC powers;

[0007] A zero-crossing detection circuit, connected to the rectifier and filter circuit, for performing zero-crossing detection on the first direct current output by the alternating current power supply and generating a zero-crossing detection signal;

[0008] Microwave circuit, used for collecting microwave sensing signals;

[0009] Light sensing circuit, used to collect ambient light sensing signals;

[0010] a control circuit, connected to the microwave circuit, the light sensing circuit and the zero-crossing detection circuit respectively, for receiving the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, and generating a main light source driving signal and a warning light source driving signal according to the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, wherein a chopping time point of the main light source driving signal is consistent with a chopping time point of the zero-crossing detection signal;

[0011] a main light source driving circuit, connected to the rectifier and filter circuit, the control circuit and the main light source, for driving the main light source to light up according to the main light source driving signal and the second direct current output by the alternating current power supply, and performing chopping processing on the second direct current according to the main light source driving signal, so that the extinguishing time point of the main light source is consistent with the chopping time point of the zero-crossing detection signal;

[0012] a power supply circuit, connected to the rectifying and filtering circuit, the microwave circuit, the photosensitive circuit and the control circuit respectively, for receiving a third direct current output by the alternating current power supply, and generating a direct current power supply signal according to the third direct current to supply power to the microwave circuit, the photosensitive circuit and the control circuit; and

[0013] The warning light source driving circuit is connected to the power supply circuit and the control circuit, and is used to receive the warning light source driving signal and the DC power supply signal, and drive the warning light source to light up according to the warning light source driving signal and the DC power supply signal.

[0014] Optionally, the microwave warning drive circuit further includes:

[0015] A voltage stabilizing circuit is connected to the power supply circuit and is used for stabilizing the DC power supply signal.

[0016] Optionally, the rectification and filtering circuit includes: a fuse, a first capacitor, a first inductor, a first resistor, a first diode, a second diode and a rectifier bridge;

[0017] The first end of the fuse is connected to the live wire of the AC power supply, the second end of the fuse, the first end of the first capacitor and the first input end of the rectifier bridge are connected together, the ground end of the rectifier bridge is grounded, the second end of the first capacitor and the second input end of the rectifier bridge are connected to the neutral line of the AC power supply, the output end of the rectifier bridge, the first end of the first resistor and the first end of the first inductor are connected to the zero-crossing detection circuit, the second end of the first resistor, the second end of the first inductor, the anode of the first diode and the anode of the second diode are connected together, the cathode of the first diode is connected to the main light source driving circuit, and the cathode of the second diode is connected to the power supply circuit.

[0018] Optionally, the main light source driving circuit includes: a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third diode and a chopper dimming chip;

[0019] The first end of the second resistor, the first end of the second capacitor, the first end of the ninth resistor, the cathode of the third diode, the first end of the sixth capacitor and the first end of the tenth resistor are commonly connected to the rectifier and filter circuit and the main light source, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor and the first end of the third capacitor are commonly connected to the power supply end of the chopper dimming chip, the chip selection signal end of the chopper dimming chip, the first end of the seventh resistor and the first end of the eighth resistor are commonly connected, the pulse width modulation signal input end of the chopper dimming chip is connected to the first end of the fifth resistor, the second end of the fifth resistor and the first end of the sixth resistor are commonly connected to the control circuit, the second end of the second capacitor, the second end of the sixth resistor, the second end of the seventh resistor, the second end of the eighth resistor, the second end of the third capacitor, the second end of the fourth resistor and the ground end of the chopper dimming chip are connected to the ground, the second end of the fourth resistor is connected to the first end of the fifth capacitor, the two drain signal ends of the chopper dimming chip, the first end of the fourth capacitor, the anode of the third diode and the first end of the second inductor are connected to each other, the second end of the fourth capacitor is connected to the second end of the ninth resistor, and the second end of the second inductor, the second end of the sixth capacitor, the second end of the tenth resistor and the second end of the fifth capacitor are connected to the main light source.

[0020] Optionally, the power supply circuit includes: a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a twenty-fourth capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fourth diode, a fifth diode, a third inductor and a power supply chip;

[0021] The multiple drain chip terminals of the power supply chip, the first terminal of the seventh capacitor and the first terminal of the eighth capacitor are connected to the rectifier and filter circuit, the chip selection signal terminal of the power supply chip, the first terminal of the eleventh resistor and the first terminal of the twelfth resistor are connected to each other, the feedback signal terminal of the power supply chip, the first terminal of the thirteenth resistor and the first terminal of the fourteenth resistor are connected to each other, the power supply terminal of the power supply chip is connected to the first terminal of the ninth capacitor, the ground terminal of the power supply chip, the second terminal of the twelfth resistor, the second terminal of the eleventh resistor, the second terminal of the thirteenth resistor, the second terminal of the eleventh capacitor, the first terminal of the third inductor, the second terminal of the ninth capacitor, the first terminal of the tenth capacitor and the fifth diode The cathode of the tenth capacitor is connected in common, the second end of the tenth capacitor is connected to the first end of the fifteenth resistor, the second end of the fourteenth resistor, the second end of the eleventh capacitor and the cathode of the fourth diode are connected in common, the second end of the seventh capacitor, the anode of the fourth diode, the first end of the sixteenth resistor, the first end of the twenty-fourth capacitor, the first end of the twelfth capacitor and the second end of the third inductor are connected in common to form the output end of the power supply circuit and connected to the microwave circuit, the photosensitive circuit and the control circuit, the second end of the eighth capacitor, the anode of the fifth diode, the second end of the fifteenth resistor, the second end of the sixteenth resistor, the second end of the twenty-fourth capacitor and the second end of the twelfth capacitor are connected in common to ground.

[0022] Optionally, the microwave circuit includes: an ultrasonic sensor and a seventeenth resistor; the power supply end of the ultrasonic sensor is connected to the power supply circuit, the microwave sensing signal end of the ultrasonic sensor and the first end of the seventeenth resistor are connected to the control circuit, and the ground end of the ultrasonic sensor and the second end of the seventeenth resistor are connected to the ground.

[0023] Optionally, the warning light source driving circuit includes: a driving chip, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a fourth inductor, a sixth diode, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor and a twenty-first capacitor;

[0024] The first end of the fourth inductor and the first end of the eighteenth capacitor are connected to the power supply circuit, the second end of the fourth inductor and the anode of the sixth diode are connected to the power switch signal end of the driver chip, the power supply end of the driver chip and the first end of the nineteenth capacitor, the input end of the driver chip, the second end of the eighteenth capacitor, the first end of the twentieth capacitor and the first end of the twenty-fourth resistor are connected to each other, the chip selection signal end of the driver chip, the first end of the eighteenth resistor and the first end of the nineteenth resistor are connected to the warning light source, the second end of the eighteenth resistor is connected to the cathode of the sixth diode, the second end of the nineteenth resistor is connected to the twentieth resistor The first end of the driving chip is connected to the ground, the ground end of the driving chip is grounded, the overvoltage protection signal end of the driving chip, the second end of the 20th resistor, and the first end of the 21st resistor are commonly connected, the pulse width modulation signal end of the driving chip is connected to the first end of the 23rd resistor, the second end of the 23rd resistor and the first end of the 22nd resistor are commonly connected to the control circuit, the signal compensation end of the driving chip is connected to the first end of the 21st capacitor, the second end of the 21st resistor, the second end of the 22nd resistor, the second end of the 21st capacitor, the second end of the 19th capacitor, the second end of the 20th capacitor and the second end of the 24th resistor are commonly connected to the ground.

[0025] Optionally, the zero-crossing detection circuit includes: a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a voltage regulator tube and a twenty-second capacitor;

[0026] The first end of the twenty-fifth resistor is connected to the rectifier and filter circuit, the second end of the twenty-fifth resistor is connected to the first end of the twenty-sixth resistor, the second end of the twenty-sixth resistor, the first end of the twenty-seventh resistor, the first end of the twenty-second capacitor and the cathode of the Zener diode are connected to the control circuit, and the second end of the twenty-second capacitor, the second end of the twenty-seventh resistor and the anode of the Zener diode are connected to ground.

[0027] Optionally, the light sensing circuit includes: a photosensitive diode, a twenty-eighth resistor, and a twenty-third capacitor;

[0028] The first end of the photosensitive diode is connected to the power supply circuit, the second end of the photosensitive diode, the first end of the twenty-eighth resistor and the first end of the twenty-third capacitor are connected to the control circuit, and the second end of the twenty-eighth resistor and the second end of the twenty-third capacitor are connected to ground.

[0029] The second aspect of the present application further provides a lamp, comprising: a main light source; a warning light source; and a microwave warning driving circuit as described in any one of the above items, wherein the microwave warning driving circuit is connected to the main light source and the warning light source respectively.

[0030] The embodiment of the present application provides a microwave warning drive circuit and a lamp, which performs zero-crossing detection on the first direct current output by the alternating current power supply through a zero-crossing detection circuit, and generates a zero-crossing detection signal to the control circuit, the microwave circuit collects the microwave sensing signal, the photosensitive circuit collects the ambient light sensing signal, and the control circuit generates a main light source drive signal and a warning light source drive signal based on the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, wherein the chopping time point of the main light source drive signal is consistent with the chopping time point of the zero-crossing detection signal, so that the extinction time point of the main light source is consistent with the chopping time point of the zero-crossing detection signal, thereby avoiding the ambient light sensing signal collected by the photosensitive circuit from being affected by the light emission of the lamp itself, and solving the problem that microwave induction lamps with light sensing on the market have no way to shield their own light, and can only detect ambient light when their own light is extinguished. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a microwave warning drive circuit provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of another microwave warning driving circuit provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the structure of another microwave warning drive circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] The present application embodiment provides a microwave warning driving circuit, see Figure 1As shown, the microwave warning drive circuit in this embodiment is respectively connected to the main light source 11 and the warning light source 12, and the microwave warning drive circuit includes: a rectifier and filter circuit 21, a zero-crossing detection circuit 22, a microwave circuit 23, a photosensitive circuit 24, a control circuit 25, a main light source drive circuit 26, a power supply circuit 27 and a warning light source drive circuit 28. Specifically, the rectifier and filter circuit 21 is used to access the AC power supply 10 and convert the AC power provided by the AC power supply 10 into multiple DC powers; the zero-crossing detection circuit 22 is connected to the rectifier and filter circuit 21, and is used to perform zero-crossing detection on the first DC power output by the AC power supply 10 and generate a zero-crossing detection signal; the microwave circuit 23 is used to collect microwave sensing signals; the photosensitive circuit 24 is used to collect ambient light sensing signals; the control circuit 25 is respectively connected to the microwave circuit 23, the photosensitive circuit 24 and the zero-crossing detection circuit 22, and is used to receive the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, and generate a main light source drive signal and a warning light source drive signal according to the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, wherein the chopping time point of the main light source drive signal is consistent with the chopping time point of the zero-crossing detection signal; the main light source drive circuit 26 is connected to the rectifier and filter circuit 21 and the control circuit 25 with The power supply circuit 27 is connected to the rectifier and filter circuit 21, the microwave circuit 23, the photosensitive circuit 24 and the control circuit 25, respectively, for receiving the third direct current output by the AC power supply 10, and generating a direct current power supply signal according to the third direct current to power the microwave circuit 23, the photosensitive circuit 24 and the control circuit 25; the warning light source driving circuit 28 is connected to the power supply circuit 27 and the control circuit 25, for receiving the warning light source driving signal and the direct current power supply signal, and driving the warning light source 12 to light up according to the warning light source driving signal and the direct current power supply signal.

[0039] In this embodiment, since the rectifier and filter circuit 21 converts the AC power provided by the AC power supply 10 into a DC voltage waveform without a negative half-cycle, the zero-crossing detection circuit 22 performs zero-crossing detection on the first DC power output by the rectifier and filter circuit 21 to generate a zero-crossing detection signal TS1. The main light source drive signal output by the control circuit 25 is consistent with the chopping time point of the zero-crossing detection signal TS1, that is, when the zero-crossing detection signal TS1 is 0V, the main light source drive signal chops the output current of the main light source drive circuit 26, thereby ensuring that the chopping point of the main light source drive circuit 26 is consistent in each cycle, that is, the output current waveform of each cycle is consistent, thereby avoiding the flashing phenomenon of the main light source 11.

[0040] Furthermore, in one embodiment, the control circuit 25 also generates a main light source driving signal PWM1 and a warning light source driving signal PWM2 based on the microwave sensing signal TS2 and the ambient light sensing signal TS3 to respectively drive the main light source 11 and the warning light source 12 to light up. For example, when someone passes by, the microwave sensing signal TS2 collected by the microwave circuit 23 is at a high level, and when no one is walking, the microwave sensing signal TS2 collected by the microwave circuit 23 is at a low level, and when the ambient light is bright, the voltage of the ambient light sensing signal TS3 output by the light sensing circuit 24 is greater than 3V, and when the environment is dark, the voltage of the ambient light sensing signal TS3 is less than 0.7V.

[0041] In a specific application scenario, when TS2 outputs a high level and TS3>3V, that is, someone is walking in a bright environment, PWM1 outputs a low level and PWM2 outputs a high level, then the main light source 11 and the warning light source 12 are lit; when TS2 outputs a high level and TS3<0.7V, that is, someone is walking in a dark environment, PWM1 outputs a low level and PWM2 outputs a high level, then the main light source 11 is off, and the warning light source 12 is lit; when TS2 outputs a low level and TS3>3V, that is, no one is walking in a bright environment, PWM1 outputs a low level and PWM2 outputs a low level, then the main light source 11 is off, and the warning light source 12 is also off; when TS2 outputs a low level and TS3<0.7V, that is, no one is walking in a dark environment, PWM1 outputs a level at the same chopping time point as the zero-crossing detection signal TS1, and PWM2 outputs a low level, at which time the main light is on and the warning light is off.

[0042] In one embodiment, the light sensing circuit 24 collects the ambient light sensing signal TS3 only after the main light source 11 is turned off. For example, the main light source driving signal output by the control circuit 25 is at a low level (the time for maintaining the low level is T), and the start time of the low level coincides with the time point when the zero-crossing detection signal TS1 is 0V. At this time, the main light source 11 is turned off, and the light sensing circuit 24 detects the ambient light, thereby avoiding detecting the light of the lamp itself and only detecting the ambient light.

[0043] Furthermore, in one embodiment, the time point when the photosensitive circuit 24 detects ambient light can be time T1 after the main light source driving signal PWM1 is at a low level, wherein T1+T2=T, that is, the control circuit 25 outputs a low level at time T. After the main light is turned off, within time T1, the control circuit 25 does not collect the ambient light sensing signal TS3, but collects the ambient light sensing signal TS3 within time T2, thereby avoiding the output capacitor in the main light source driving circuit 26 from affecting the voltage of the main light source 11. For example, the detection of the ambient light sensing signal TS3 is started when the main light source driving signal output by the control circuit 25 is a low level of 2ms, and the main light source 11 is turned off. The specific detection time period can be 1.7-1.9ms, and no detection is performed during the period of 0-1.7ms. The output capacitor in the main light source driving circuit 26 is usually a small-capacity film capacitor. When the control circuit 25 outputs a low level of 2ms (i.e., the main light source driving signal PWM1), although the output current does not drop to 0mA immediately, it can ensure that the current is reduced to 0mA within 1.7ms. The detection is performed during the period of 1.7-1.9ms, which can avoid detecting the self-light and only detect the ambient light. The above detection time can also be other times, and this time is only for illustration.

[0044] In one embodiment, when TS2 outputs a low level and TS3 is less than 0.7V, that is, no one is walking in a dark environment, the main light source drive signal PWM1 output by the control circuit 25 outputs a level at the same chopping time point as the zero-crossing detection signal TS1, and repeats the ambient light detection process in the above embodiment, and PWM2 outputs a low level. At this time, the main light (main light source 11) is turned on and the warning light (warning light source 12) is turned off.

[0045] In one embodiment, see Figure 2 As shown, the microwave warning driving circuit also includes a voltage stabilizing circuit 29, which is connected to the power supply circuit 27 and is used to stabilize the DC power supply signal.

[0046] In this embodiment, the DC power supply signal output by the power supply circuit 27 is stabilized by the voltage stabilizing circuit 29 to avoid detection errors caused by unstable power supply to the microwave circuit 23 , the photosensitive circuit 24 and the control circuit 25 .

[0047] In one embodiment, see Figure 3As shown, the rectifier and filter circuit 21 includes: a fuse FR1, a first capacitor C1, a first inductor L1, a first resistor R1, a first diode D1, a second diode D2 and a rectifier bridge BD; the first end of the fuse FR1 is connected to the live wire of the AC power supply 10, the second end of the fuse FR1, the first end of the first capacitor C1 and the first input end of the rectifier bridge BD are connected in common, the ground end of the rectifier bridge BD is grounded, the second end of the first capacitor C1 and the second input end of the rectifier bridge BD are connected in common to the zero line of the AC power supply 10, the output end of the rectifier bridge, the first end of the first resistor R1 and the first end of the first inductor L1 are connected in common to the zero-crossing detection circuit 22, the second end of the first resistor R1, the second end of the first inductor L1, the anode of the first diode D1 and the anode of the second diode D2 are connected in common, the cathode of the first diode D1 is connected to the main light source driving circuit 26, and the cathode of the second diode D2 is connected to the power supply circuit 27.

[0048] In one embodiment, the fuse FR1 is used to detect overcurrent of the AC power output by the AC power supply 10 to prevent circuit damage caused by AC overcurrent, and the rectifier bridge BD is used to rectify the AC power, for example, converting the 50 / 60HZ AC sine wave provided by the AC power supply 10 into a 100 / 120HZ DC waveform without a negative half cycle.

[0049] In one embodiment, see Figure 3 As shown, the rectifier bridge BD includes a seventh diode D7, an eighth diode D8, a ninth diode D9 and a tenth diode D10; the anode of the seventh diode D7 and the anode of the ninth diode D9 are connected to the ground, the cathode of the seventh diode D7 and the anode of the eighth diode D8 are connected to the fuse FR1, the cathode of the ninth diode D9 and the anode of the tenth diode D10 are connected to the neutral line N of the AC power supply 10, and the cathode of the tenth diode D10 and the cathode of the eighth diode D8 are connected to the rectifier and filter circuit 21.

[0050] In one embodiment, see Figure 3As shown, the main light source driving circuit 26 includes: a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third diode D3 and a chopper dimming chip U1; the first end of the second resistor R2, the first end of the second capacitor C2, the first end of the ninth resistor R9, the cathode of the third diode D3, the first end of the sixth capacitor C6 and the first end of the tenth resistor R10 are connected to the rectifier and filter circuit 21 and the main light source 11, the second end of the second resistor R2 is connected to the first end of the third resistor R3, the second end of the third resistor R3 and the first end of the third capacitor C3 are connected to the power supply terminal VDD of the chopper dimming chip U1, the chip select signal terminal CS of the chopper dimming chip U1, the first end of the seventh resistor R7 and the first end of the eighth resistor R8 are connected to each other, The pulse width modulation signal input terminal DIM of the chopper dimming chip U1 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 and the first end of the sixth resistor R6 are commonly connected to the control circuit 25, the second end of the second capacitor C2, the second end of the sixth resistor R6, the second end of the seventh resistor R7, the second end of the eighth resistor R8, the second end of the third capacitor C3, the second end of the fourth resistor R4 and the ground terminal GND of the chopper dimming chip U1 are commonly connected to the ground, the second end of the fourth resistor R4 is connected to the first end of the fifth capacitor C5, the two drain signal terminals DRAIN of the chopper dimming chip U1, the first end of the fourth capacitor C4, the anode of the third diode D3 and the first end of the second inductor are commonly connected, the second end of the fourth capacitor C4 is commonly connected to the second end of the ninth resistor R9, the second end of the second inductor, the second end of the sixth capacitor C6, the second end of the tenth resistor R10 and the second end of the fifth capacitor C5 are commonly connected to the main light source 11.

[0051] In this embodiment, the chopping dimming chip U1 chops the output current based on the main light source driving signal. By chopping when the control circuit 25 detects that the zero-crossing detection signal TS1 is 0V, it can ensure that the chopping point of the output current is consistent in each detection cycle, that is, the output current waveform of each cycle is consistent, thereby avoiding the flashing phenomenon of the main light source 11.

[0052] In one embodiment, see Figure 3 As shown, the main light source 11 may be a first light emitting diode LED1.

[0053] In one embodiment, see Figure 3As shown, the power supply circuit 27 includes: a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a twenty-fourth capacitor C24, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fourth diode D4, a fifth diode D5, a third inductor L3 and a power supply chip U2; a plurality of drain chip terminals DR of the power supply chip U2, a first end of the seventh capacitor C7 and the eighth capacitor C12 The first end of the capacitor C8 is commonly connected to the rectifier and filter circuit 21, the chip selection signal terminal CS of the power supply chip U2, the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12 are commonly connected, the feedback signal terminal FB of the power supply chip U2, the first end of the thirteenth resistor R13 and the first end of the fourteenth resistor R14 are commonly connected, the power supply terminal VDD of the power supply chip U2 is connected to the first end of the ninth capacitor C9, the ground terminal GND of the power supply chip U2, the second end of the twelfth resistor R12, the ground terminal GND of the eleventh resistor R11 The second end of the thirteenth resistor R13, the second end of the eleventh capacitor C11, the first end of the third inductor L3, the second end of the ninth capacitor C9, the first end of the tenth capacitor C10 and the cathode of the fifth diode D5 are connected in common, the second end of the tenth capacitor C10 is connected to the first end of the fifteenth resistor R15, the second end of the fourteenth resistor R14, the second end of the eleventh capacitor C11 and the cathode of the fourth diode D4 are connected in common, the second end of the seventh capacitor C7, the anode of the fourth diode D4, The first end of the sixteenth resistor R16, the first end of the twenty-fourth capacitor C24, the first end of the twelfth capacitor C12 and the second end of the third inductor L3 are connected together to form the output end of the power supply circuit 27, which is connected to the microwave circuit 23, the photosensitive circuit 24 and the control circuit 25. The second end of the eighth capacitor, the anode of the fifth diode D5, the second end of the fifteenth resistor R15, the second end of the sixteenth resistor R16, the second end of the twenty-fourth capacitor C24 and the second end of the twelfth capacitor C12 are connected to the ground.

[0054] In this embodiment, the power supply chip U2 and its peripheral circuits perform voltage conversion on the second direct current output by the rectifying and filtering circuit 21 to supply power to the rear-end microwave circuit 23 , the photosensitive circuit 24 , and the control circuit 25 .

[0055] In one embodiment, see Figure 3As shown, the microwave circuit 23 includes: an ultrasonic sensor CON1 and a seventeenth resistor R17; a power supply terminal VCC of the ultrasonic sensor CON1 is connected to the power supply circuit 27, a microwave sensing signal terminal PWM of the ultrasonic sensor CON1 and a first end of the seventeenth resistor R17 are connected to the control circuit 25, and a ground terminal GND of the ultrasonic sensor CON1 and a second end of the seventeenth resistor R17 are connected to the ground.

[0056] In this embodiment, the ultrasonic sensor CON1 detects whether a moving object passes by, thereby generating a microwave induction signal.

[0057] In one embodiment, see Figure 3As shown, the warning light source driving circuit 28 includes: a driving chip U4, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a fourth inductor L4, a sixth diode D6, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20 and a twenty-first capacitor C21; the first end of the fourth inductor L4 and the first end of the eighteenth capacitor C18 are connected to the The power supply circuit 27, the second end of the fourth inductor L4 and the anode of the sixth diode D6 are commonly connected to the power switch signal terminal SW of the driving chip U4, the power supply terminal VDD of the driving chip U4 and the first end of the nineteenth capacitor C19, the input terminal VIN of the driving chip U4, the second end of the eighteenth capacitor C18, the first end of the twentieth capacitor C20 and the first end of the twenty-fourth resistor R24 ​​are commonly connected, the chip select signal terminal CS of the driving chip U4, the first end of the eighteenth resistor R18 and the first end of the twenty-fourth resistor R24 ​​are commonly connected The first end of the nineteenth resistor R19 is connected to the warning light source 12, the second end of the eighteenth resistor R18 is connected to the cathode of the sixth diode D6, the second end of the nineteenth resistor R19 is connected to the first end of the twentieth resistor R20, the ground terminal GND of the driving chip U4 is grounded, the overvoltage protection signal terminal OVP of the driving chip U4, the second end of the twentieth resistor R20, and the first end of the twenty-first resistor R21 are connected in common, the pulse width modulation signal terminal ADI of the driving chip U4 is connected to the first end of the twenty-third resistor R23, the second end of the twenty-third resistor R23 and the first end of the twenty-second resistor R22 are connected in common to the control circuit 25, the signal compensation terminal COMP of the driving chip U4 is connected to the first end of the twenty-first capacitor C21, the second end of the twenty-first resistor R21, the second end of the twenty-second resistor R22, the second end of the twenty-first capacitor C21, the second end of the nineteenth capacitor C19, the second end of the twentieth capacitor C20, and the second end of the twenty-fourth resistor R24 ​​are connected in common to ground.

[0058] In this embodiment, the warning light source driving circuit 28 adjusts the warning light source 12 based on the warning light source driving signal PWM2 provided by the control circuit 25. Specifically, the warning light source driving circuit 28 drives the warning light source 12 to light up. When the microwave sensing signal TS2 is detected to be at a high level, it means that someone is walking. At this time, the control circuit 25 outputs the corresponding warning light source driving signal to drive the warning light source 12 to light up.

[0059] In one embodiment, see Figure 3 As shown, the warning light source 12 may be a second light emitting diode LED2.

[0060] In one embodiment, see Figure 3 As shown, the zero-crossing detection circuit 22 includes: a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a voltage regulator ZD and a twenty-second capacitor C22; the first end of the twenty-fifth resistor R25 is connected to the rectifier and filter circuit 21, the second end of the twenty-fifth resistor R25 is connected to the first end of the twenty-sixth resistor R26, the second end of the twenty-sixth resistor R26, the first end of the twenty-seventh resistor R27, the first end of the twenty-second capacitor C22 and the cathode of the voltage regulator ZD are commonly connected to the control circuit 25, and the second end of the twenty-second capacitor C22, the second end of the twenty-seventh resistor R27 and the anode of the voltage regulator ZD are commonly connected to the ground.

[0061] In one embodiment of the present invention, the twenty-fifth resistor R25, the twenty-sixth resistor R26, the twenty-seventh resistor R27 and the voltage regulator ZD form a voltage divider circuit, thereby performing zero-crossing detection on the first direct current output by the rectifier and filter circuit 21 to ensure that the current waveform of each cycle is kept consistent.

[0062] In one embodiment, see Figure 3 As shown, the light sensing circuit 24 includes: a photosensitive diode CDS1, a twenty-eighth resistor R28, and a twenty-third capacitor C23; the first end of the photosensitive diode CDS1 is connected to the power supply circuit 27, the second end of the photosensitive diode CDS1, the first end of the twenty-eighth resistor R28, and the first end of the twenty-third capacitor C23 are commonly connected to the control circuit 25, and the second end of the twenty-eighth resistor R28 and the second end of the twenty-third capacitor C23 are commonly connected to the ground.

[0063] In one embodiment, see Figure 3 As shown, the voltage stabilizing circuit 29 includes a voltage stabilizing chip U3, a thirteenth capacitor C13 and a fourteenth capacitor C14; the input end of the voltage stabilizing chip U3 is connected to the power supply circuit 27, the output end of the voltage stabilizing chip U3, the first end of the thirteenth capacitor C13 and the first end of the fourteenth capacitor C14 are connected to the microwave circuit 23, and the ground end of the voltage stabilizing chip U3, the second end of the thirteenth capacitor C13 and the second end of the fourteenth capacitor C14 are grounded.

[0064] In one embodiment, see Figure 3As shown, the control circuit 25 is composed of a control chip U5, the zero-crossing detection signal terminal TS1 of the control chip U5 is connected to the zero-crossing detection circuit 22, and is used to receive the zero-crossing detection signal TS1 output by the zero-crossing detection circuit 22, the microwave sensing signal terminal TS2 of the control chip U5 is connected to the microwave circuit 23, and is used to receive the microwave sensing signal TS2 output by the microwave circuit 23, the ambient light sensing signal terminal TS3 of the control chip U5 is connected to the light sensing circuit 24, and is used to receive the ambient light sensing signal TS3 output by the light sensing circuit 24, the main light source driving signal terminal PWM1 of the control chip U5 is connected to the main light source driving circuit 26, and is used to provide the main light source driving signal PWM2 to the main light source driving circuit 26, and the warning light source driving signal terminal PWM2 of the control chip U5 is connected to the warning light source 12 driving circuit, and is used to provide the warning light source driving signal PWM2 to the warning light source 12 driving circuit.

[0065] Specifically, the control chip U5 can be a logic control circuit 25, which can be composed of basic logic circuits such as AND gates, OR gates and NOT gates, so as to generate corresponding main light source driving signals and warning light source driving signals based on the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal. For example, when TS2 is at a high level and TS3>3V, that is, there is someone walking in a bright environment, PWM1 is at a low level and PWM2 is at a high level. At this time, the main light source 11 and the warning light source 12 are lit; when TS2 is at a high level and TS3<0.7V, that is, there is someone walking in a dark environment, PWM1 is at a low level and PWM2 is at a high level. At this time, the main light source 11 is off and the warning light source 12 is lit; when TS2 is at a low level and TS3>3V, that is, there is no one walking in a bright environment, PWM1 is at a low level and PWM2 is at a low level. At this time, the main light source 11 is off and the warning light source 12 is also off; when TS2 is at a low level and TS3<0.7V, that is, there is no one walking in a dark environment, PWM1 outputs a level at the same chopping time point as the zero-crossing detection signal TS1, the light sensing circuit 24 continues to collect the ambient light sensing signal TS3, and PWM2 outputs a low level. At this time, the main light is on and the warning light is off.

[0066] The second aspect of the present application further provides a lamp, comprising: a main light source 11; a warning light source 12; and a microwave warning driving circuit as described in any one of the above items, wherein the microwave warning driving circuit is connected to the main light source 11 and the warning light source 12 respectively.

[0067] The embodiment of the present application provides a microwave warning drive circuit and a lamp, which performs zero-crossing detection on the first direct current output by the alternating current power supply through a zero-crossing detection circuit, and generates a zero-crossing detection signal to the control circuit, the microwave circuit collects the microwave sensing signal, the photosensitive circuit collects the ambient light sensing signal, and the control circuit generates a main light source drive signal and a warning light source drive signal based on the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, wherein the chopping time point of the main light source drive signal is consistent with the chopping time point of the zero-crossing detection signal, so that the extinction time point of the main light source is consistent with the chopping time point of the zero-crossing detection signal, thereby avoiding the ambient light sensing signal collected by the photosensitive circuit from being affected by the light emission of the lamp itself, and solving the problem that microwave induction lamps with light sensing on the market have no way to shield their own light, and can only detect ambient light when their own light is extinguished.

[0068] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0069] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0072] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A microwave warning driving circuit, connected to a main light source and a warning light source respectively, characterized in that: The microwave warning driving circuit comprises: A rectifier and filter circuit, used for connecting to an AC power source and converting the AC power provided by the AC power source into a plurality of DC powers; A zero-crossing detection circuit, connected to the rectifier and filter circuit, for performing zero-crossing detection on the first direct current output by the alternating current power supply and generating a zero-crossing detection signal; Microwave circuit, used for collecting microwave sensing signals; A light sensing circuit, used for collecting an ambient light sensing signal; the light sensing circuit collects the ambient light sensing signal after the main light source is turned off; a control circuit, connected to the microwave circuit, the light sensing circuit and the zero-crossing detection circuit respectively, for receiving the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, and generating a main light source driving signal and a warning light source driving signal according to the zero-crossing detection signal, the microwave sensing signal and the ambient light sensing signal, wherein a chopping time point of the main light source driving signal is consistent with a chopping time point of the zero-crossing detection signal; a main light source driving circuit, connected to the rectifier and filter circuit, the control circuit and the main light source, for driving the main light source to light up according to the main light source driving signal and the second direct current output by the alternating current power supply, and performing chopping processing on the second direct current according to the main light source driving signal, so that the extinguishing time point of the main light source is consistent with the chopping time point of the zero-crossing detection signal; a power supply circuit, connected to the rectifying and filtering circuit, the microwave circuit, the photosensitive circuit and the control circuit respectively, for receiving a third direct current output by the alternating current power supply, and generating a direct current power supply signal according to the third direct current to supply power to the microwave circuit, the photosensitive circuit and the control circuit; and The warning light source driving circuit is connected to the power supply circuit and the control circuit, and is used to receive the warning light source driving signal and the DC power supply signal, and drive the warning light source to light up according to the warning light source driving signal and the DC power supply signal.

2. The microwave warning driving circuit according to claim 1, characterized in that: The microwave warning driving circuit also includes: A voltage stabilizing circuit is connected to the power supply circuit and is used for stabilizing the DC power supply signal.

3. The microwave warning driving circuit according to claim 1, characterized in that: The rectification and filtering circuit comprises: a fuse, a first capacitor, a first inductor, a first resistor, a first diode, a second diode and a rectifier bridge; The first end of the fuse is connected to the live wire of the AC power supply, the second end of the fuse, the first end of the first capacitor and the first input end of the rectifier bridge are connected together, the ground end of the rectifier bridge is grounded, the second end of the first capacitor and the second input end of the rectifier bridge are connected to the neutral line of the AC power supply, the output end of the rectifier bridge, the first end of the first resistor and the first end of the first inductor are connected to the zero-crossing detection circuit, the second end of the first resistor, the second end of the first inductor, the anode of the first diode and the anode of the second diode are connected together, the cathode of the first diode is connected to the main light source driving circuit, and the cathode of the second diode is connected to the power supply circuit.

4. The microwave warning driving circuit according to claim 1, characterized in that: The main light source driving circuit includes: a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third diode, a second inductor and a chopper dimming chip; The first end of the second resistor, the first end of the second capacitor, the first end of the ninth resistor, the cathode of the third diode, the first end of the sixth capacitor and the first end of the tenth resistor are commonly connected to the rectifier and filter circuit and the main light source, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor and the first end of the third capacitor are commonly connected to the power supply end of the chopper dimming chip, the chip selection signal end of the chopper dimming chip, the first end of the seventh resistor and the first end of the eighth resistor are commonly connected, the pulse width modulation signal input end of the chopper dimming chip is connected to the first end of the fifth resistor, the second end of the fifth resistor and the first end of the sixth resistor are commonly connected to the control circuit, the second end of the second capacitor, the second end of the sixth resistor, the second end of the seventh resistor, the second end of the eighth resistor, the second end of the third capacitor, the second end of the fourth resistor and the grounding end of the chopper dimming chip are connected to the ground, the second end of the fourth resistor is connected to the first end of the fifth capacitor, the two drain signal ends of the chopper dimming chip, the first end of the fourth capacitor, the anode of the third diode and the first end of the second inductor are connected to each other, the second end of the fourth capacitor is connected to the second end of the ninth resistor, and the second end of the second inductor, the second end of the sixth capacitor, the second end of the tenth resistor and the second end of the fifth capacitor are connected to the main light source.

5. The microwave warning driving circuit according to claim 1, characterized in that: The power supply circuit includes: a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a twenty-fourth capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fourth diode, a fifth diode, a third inductor and a power supply chip; The multiple drain chip terminals of the power supply chip, the first terminal of the seventh capacitor and the first terminal of the eighth capacitor are connected to the rectifier and filter circuit, the chip selection signal terminal of the power supply chip, the first terminal of the eleventh resistor and the first terminal of the twelfth resistor are connected to each other, the feedback signal terminal of the power supply chip, the first terminal of the thirteenth resistor and the first terminal of the fourteenth resistor are connected to each other, the power supply terminal of the power supply chip is connected to the first terminal of the ninth capacitor, the ground terminal of the power supply chip, the second terminal of the twelfth resistor, the second terminal of the eleventh resistor, the second terminal of the thirteenth resistor, the second terminal of the eleventh capacitor, the first terminal of the third inductor, the second terminal of the ninth capacitor, the first terminal of the tenth capacitor and the fifth diode The cathode of the tenth capacitor is connected in common, the second end of the tenth capacitor is connected to the first end of the fifteenth resistor, the second end of the fourteenth resistor, the second end of the eleventh capacitor and the cathode of the fourth diode are connected in common, the second end of the seventh capacitor, the anode of the fourth diode, the first end of the sixteenth resistor, the first end of the twenty-fourth capacitor, the first end of the twelfth capacitor and the second end of the third inductor are connected in common to form the output end of the power supply circuit and connected to the microwave circuit, the photosensitive circuit and the control circuit, the second end of the eighth capacitor, the anode of the fifth diode, the second end of the fifteenth resistor, the second end of the sixteenth resistor, the second end of the twenty-fourth capacitor and the second end of the twelfth capacitor are connected in common to ground.

6. The microwave warning driving circuit according to claim 1, characterized in that: The microwave circuit includes: an ultrasonic sensor and a seventeenth resistor; the power supply end of the ultrasonic sensor is connected to the power supply circuit, the microwave sensing signal end of the ultrasonic sensor and the first end of the seventeenth resistor are connected to the control circuit, and the ground end of the ultrasonic sensor and the second end of the seventeenth resistor are connected to the ground.

7. The microwave warning driving circuit according to claim 1, characterized in that: The warning light source driving circuit includes: a driving chip, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a fourth inductor, a sixth diode, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor and a twenty-first capacitor; The first end of the fourth inductor and the first end of the eighteenth capacitor are connected to the power supply circuit, the second end of the fourth inductor and the anode of the sixth diode are connected to the power switch signal end of the driver chip, the power supply end of the driver chip and the first end of the nineteenth capacitor, the input end of the driver chip, the second end of the eighteenth capacitor, the first end of the twentieth capacitor and the first end of the twenty-fourth resistor are connected to each other, the chip selection signal end of the driver chip, the first end of the eighteenth resistor and the first end of the nineteenth resistor are connected to the warning light source, the second end of the eighteenth resistor is connected to the cathode of the sixth diode, the second end of the nineteenth resistor is connected to the twentieth resistor The first end of the driving chip is connected to the ground, the ground end of the driving chip is grounded, the overvoltage protection signal end of the driving chip, the second end of the 20th resistor, and the first end of the 21st resistor are commonly connected, the pulse width modulation signal end of the driving chip is connected to the first end of the 23rd resistor, the second end of the 23rd resistor and the first end of the 22nd resistor are commonly connected to the control circuit, the signal compensation end of the driving chip is connected to the first end of the 21st capacitor, the second end of the 21st resistor, the second end of the 22nd resistor, the second end of the 21st capacitor, the second end of the 19th capacitor, the second end of the 20th capacitor and the second end of the 24th resistor are commonly connected to the ground.

8. The microwave warning driving circuit according to any one of claims 1 to 7, characterized in that: The zero-crossing detection circuit comprises: a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a voltage regulator tube and a twenty-second capacitor; The first end of the twenty-fifth resistor is connected to the rectifier and filter circuit, the second end of the twenty-fifth resistor is connected to the first end of the twenty-sixth resistor, the second end of the twenty-sixth resistor, the first end of the twenty-seventh resistor, the first end of the twenty-second capacitor and the cathode of the Zener diode are connected to the control circuit, and the second end of the twenty-second capacitor, the second end of the twenty-seventh resistor and the anode of the Zener diode are connected to ground.

9. The microwave warning driving circuit according to any one of claims 1 to 7, characterized in that: The light sensing circuit comprises: a photosensitive diode, a twenty-eighth resistor, and a twenty-third capacitor; The first end of the photosensitive diode is connected to the power supply circuit, the second end of the photosensitive diode, the first end of the twenty-eighth resistor and the first end of the twenty-third capacitor are connected to the control circuit, and the second end of the twenty-eighth resistor and the second end of the twenty-third capacitor are connected to ground.

10. A lamp, characterized in that: include: Main light source; Warning light source; And the microwave warning drive circuit as described in any one of claims 1 to 9, wherein the microwave warning drive circuit is connected to the main light source and the warning light source respectively.

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