Silicon controlled rectifier dimming and infrared induction disc lamp

Abstract

The utility model relates to the field of lamps, in particular to a silicon controlled dimming and infrared induction disc lamp. Comprising an EMC circuit, a dimming circuit, an infrared induction control circuit, an infrared induction device, a protection circuit and an LED light source array. The dimming circuit is used for determining whether the lamp is connected to the silicon controlled rectifier dimmer or not and adjusting a corresponding working mode according to the connection condition; the infrared induction device is used for reflecting an infrared signal to the infrared induction control circuit, and the infrared induction control circuit is used for detecting the infrared signal and controlling the on / off of the LED light source array according to the infrared signal; the EMC circuit is used for protecting equipment from being interfered by other equipment and also preventing the equipment from interfering with other equipment; the protection circuit comprises an output open circuit and short circuit protection circuit, an over-temperature protection circuit, an over-current protection circuit and a surge protection circuit. The method is used for preventing possible circuit faults. According to the invention, silicon controlled rectifier dimming and infrared induction can be realized at the same time.

Description

Technical Field

[0001] This application relates to lighting fixtures, and more particularly to a silicon controlled rectifier (SCR) dimming and infrared sensing disc lamp. Background Technology

[0002] In related technologies, disk lights, also known as disc lights, are surface-mounted luminaires with power mainly ranging from 8 to 20W. These luminaires are widely used in lighting in warehouses, parking lots, commercial office buildings, and residential buildings, and are an important part of modern civil and commercial lighting. They are compatible with traditional SCR dimmers and also have infrared sensing functions. Currently, there are no such products on the market. Summary of the Invention

[0003] In view of this, this application provides a SCR dimming and infrared sensing disc lamp, which can realize SCR dimming and infrared sensing.

[0004] To achieve the above objectives, this application employs the following technical solution:

[0005] A triac-controlled dimming and infrared sensing disc lamp, characterized in that it includes an EMC circuit, a dimming circuit, an infrared sensing control circuit, an infrared sensing device, a protection circuit, and an LED light source array; the dimming circuit is used to determine whether the lamp is connected to the triac dimmer and adjust the corresponding working mode according to the connection status; the infrared sensing device is used to reflect infrared signals to the infrared sensing control circuit, which is used to detect infrared signals and control the on / off state of the LED light source array according to the infrared signals; the EMC circuit is used to protect the device from interference by other devices, and also to prevent the device from interfering with other devices; the protection circuit includes output open circuit and short circuit protection circuits, over-temperature protection circuits, over-current protection circuits, and surge protection circuits; used to prevent possible circuit failures.

[0006] In some embodiments, the dimming circuit includes integrated circuit U1, resistor Fu, resistor R1, resistor R2, capacitor C2, transformer T1, capacitor C6, and capacitor C7; the EMC circuit includes capacitor CX1, inductor L1, inductor L2, capacitor C1, capacitor C2, and capacitor C8; the surge protection circuit includes resistor Fu, resistor R1, resistor RV1, capacitor CX1, rectifier bridge D1, transformer T1, and integrated circuit U1; the over-temperature protection circuit includes integrated circuit U1, resistor R10, and resistor R11.

[0007] AC interface AC1 is connected to one end of resistor Fu. The other end of resistor Fu is connected to one end of resistor RV1 and pin 3 of inductor L1. AC interface AC2 is connected to one end of resistor R1. The other end of resistor R1 is connected to the other end of resistor RV1 and pin 1 of inductor L1. Pin 4 of inductor L1 is connected to one end of capacitor CX1 and pin 4 of rectifier bridge D1. Pin 2 of inductor L1 is connected to the other end of capacitor CX1 and pin 3 of rectifier bridge D1. Pin 1 of rectifier bridge D1 is connected to one end of inductor L2 and one end of capacitor C1. The other end of inductor L2 is connected to one end of resistor R2, one end of capacitor C3, and pin 4 of transformer T1. Pin 2 of rectifier bridge D1 is connected to the other ends of capacitors C1, C2, and C3 and grounded. The other end of capacitor C2 is connected to the other end of resistor R2. Pin 3 of transformer T1 is connected to... The circuit is connected to pin 8 of integrated circuit U1 and the anode of diode D2. Pin 6 of integrated circuit U1 is connected to one end of resistors R10 and R11 respectively, and the other ends of resistors R10 and R11 are grounded. Pin 4 of integrated circuit U1 is grounded. Pin 3 of integrated circuit U1 is connected to one end of capacitor C5, and the other end of capacitor C5 is grounded. Pin 2 of integrated circuit U1 is connected to one end of resistor R6, and the other end of resistor R6 is grounded. Pin 1 of integrated circuit U1 is connected to one end of capacitor C4, one end of resistor R3, and one end of resistor R4 respectively, and the other end of capacitor C4 is grounded. The other end of resistor R3 is connected to pin 4 of transformer T1 and one end of capacitor C8 respectively. The other end of capacitor C8 is connected to one end of resistor R5 and the cathode of diode D2 respectively. The other end of resistor R5 is connected to the other end of resistor R4. The cathode of diode D2 is connected to the positive terminal of the LED light source array.

[0008] In some embodiments, the infrared sensing circuit comprises a transformer T1, a diode D3, a Zener diode ZD1, resistors R21, R22, R23, R25, and R28, an adjustable potentiometer R24, a transistor Q1, capacitors C9 and C10, an infrared sensing integrated circuit U2, a MOSFET Q2, and a Zener diode ZD1.

[0009] Pin 5 of transformer T1 is connected to the anode of diode D3. The cathode of diode D3 is connected to one end of resistor R21. The other end of resistor R21 is connected to one end of resistor R22 and the collector of transistor Q1. The other end of resistor R22 is connected to the base of transistor Q1. The base of transistor Q1 is also connected to the cathode of Zener diode ZD1. The anode of Zener diode ZD1 is grounded and connected to one end of capacitor C9. The emitter of transistor Q1 is connected to the other end of capacitor C9 and one end of capacitor C10. The other end of capacitor C10 is connected to the movable terminal of adjustable potentiometer R24 ​​and the GND terminal of infrared sensor integrated circuit U2. The GND terminal of integrated circuit U2 is grounded; one fixed terminal of resistor R24 ​​is connected to one end of resistor R23 and the TON terminal of infrared sensing integrated circuit U2, and the other end of resistor R23 is connected to the VDD terminal of integrated circuit U2 and the emitter of transistor Q1; the REL terminal of infrared sensing integrated circuit U2 is connected to one end of resistor R25, and the other end of resistor R25 is connected to one end of resistor R28, one end of capacitor C11 and the gate of MOSFET Q2, and the other end of resistor R28 is connected to the other end of capacitor C11 and the source of MOSFET Q2 and grounded; the drain of MOSFET Q2 is connected to the negative terminal of LED light source array.

[0010] In some embodiments, the infrared sensing device includes a Fresnel lens that can reflect pyroelectric infrared signals onto the infrared sensing integrated circuit U2.

[0011] In some embodiments, the luminaire also includes a sensing time control knob connected to an adjustable potentiometer R24.

[0012] In some implementations, the output open-circuit and short-circuit protection circuit consists of integrated circuit U1, resistors R7, R8 and R9. One end of resistor R7 is connected to the cathode of diode D2, the other end of resistor R7 is connected to one end of resistor R8, the other end of resistor R8 is connected to one end of resistor R9, and the other end of resistor R9 is grounded.

[0013] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0014] 1. The aforementioned dual-function disk light with SCR dimming and infrared sensing meets the Energy Star 2.1 standard, meaning it is compatible with the existing SCR dimmer circuit in the building, enabling physical continuous dimming; and it can also achieve automatic control of the light's on / off state through the infrared sensing module.

[0015] 2. The aforementioned dual-function disk light with thyristor dimming and infrared sensing has an infrared detection angle of 120 degrees and a detection distance of 8m. The sensing time of the light can be selected and controlled from 2 seconds to 1 hour via a knob, which is suitable for different user scenarios.

[0016] 3. The aforementioned dual-function disk light with thyristor dimming and infrared sensing features an EMC circuit to prevent mutual interference between devices, resulting in high product stability.

[0017] 4. The surge protection circuit used in the aforementioned dual-function disk light with thyristor dimming and infrared sensing can meet the 2.5kV ringing wave index, which can prevent damage to the lamp caused by abnormal peak pulses of the power grid. Attached Figure Description

[0018] Figure 1 Structure of embodiments of this application

[0019] Figure 2 This is a schematic diagram of the Fresnel lens structure in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the detection range of the Fresnel lens in an embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of an embodiment of this application.

[0022] Labeling explanation: 1. Fresnel lens; 2. Sensing time control knob. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings. The terminology used in the embodiments section of this application is only for explaining specific embodiments and is not intended to limit the application.

[0024] See Figures 1 to 4 This application provides a SCR-controlled dimming and infrared sensing disc lamp, including an EMC circuit, a dimming circuit, an infrared sensing control circuit, an infrared sensing device, a protection circuit, and an LED light source array. The dimming circuit is used to determine whether the lamp is connected to the SCR dimmer and adjust the corresponding working mode according to the connection status. The infrared sensing device is used to reflect infrared signals to the infrared sensing control circuit, which is used to detect infrared signals and control the on / off state of the LED light source array according to the infrared signals. The EMC circuit is used to protect the device from interference by other devices and also to prevent the device from interfering with other devices. The protection circuit includes an output open circuit and short circuit protection circuit, an over-temperature protection circuit, an over-current protection circuit, and a surge protection circuit to prevent possible circuit failures.

[0025] The dimming circuit includes integrated circuit U1, resistors Fu, R1, R2, capacitor C2, transformer T1, capacitor C6, and capacitor C7; the EMC circuit includes capacitor CX1, inductor L1, inductor L2, capacitor C1, capacitor C2, and capacitor C8; the surge protection circuit includes resistors Fu, R1, RV1, capacitor CX1, rectifier bridge D1, transformer T1, and integrated circuit U1; the over-temperature protection circuit includes integrated circuit U1, resistors R10 and R11; the specific model of integrated circuit U1 is AL1692.

[0026] AC interface AC1 is connected to one end of resistor Fu. The other end of resistor Fu is connected to one end of resistor RV1 and pin 3 of inductor L1. AC interface AC2 is connected to one end of resistor R1. The other end of resistor R1 is connected to the other end of resistor RV1 and pin 1 of inductor L1. Pin 4 of inductor L1 is connected to one end of capacitor CX1 and pin 4 of rectifier bridge D1. Pin 2 of inductor L1 is connected to the other end of capacitor CX1 and pin 3 of rectifier bridge D1. Pin 1 of rectifier bridge D1 is connected to one end of inductor L2 and one end of capacitor C1. The other end of inductor L2 is connected to one end of resistor R2, one end of capacitor C3, and pin 4 of transformer T1. Pin 2 of rectifier bridge D1 is connected to the other ends of capacitors C1, C2, and C3 and grounded. The other end of capacitor C2 is connected to the other end of resistor R2. Pin 3 of transformer T1 is connected to... Do not connect to pin 8 of integrated circuit U1 and the anode of diode D2. Connect pin 6 of integrated circuit U1 to one end of resistor R10 and resistor R11 respectively. The other ends of resistor R10 and resistor R11 are grounded. Connect pin 4 of integrated circuit U1 to ground. Connect pin 3 of integrated circuit U1 to one end of capacitor C5. The other end of capacitor C5 is grounded. Connect pin 2 of integrated circuit U1 to one end of resistor R6. The other end of resistor R6 is grounded. Connect pin 1 of integrated circuit U1 to one end of capacitor C4, one end of resistor R3, and one end of resistor R4 respectively. The other end of capacitor C4 is grounded. Connect the other end of resistor R3 to pin 4 of transformer T1 and one end of capacitor C8 respectively. Connect the other end of capacitor C8 to one end of resistor R5 and the cathode of diode D2 respectively. Connect the other end of resistor R5 to the other end of resistor R4. Connect the cathode of diode D2 to the positive terminal of the LED light source array.

[0027] C5 and R6 are used to adjust the dimming depth and linearity adjustment rate; C4, R3, R4, and R5 are used to power U1; D2 is the component that enables the circuit to implement the boost topology function.

[0028] When the lamp is connected to the mains power, the integrated circuit U1 of the dimming circuit will determine whether the lamp is connected to a SCR dimmer based on the current, voltage, and time waveforms flowing through R10 and R11. Accordingly, the working mode of the entire circuit will be adjusted accordingly; that is, when a SCR dimmer is detected, it will switch to the compatible dimming mode; if there is no SCR dimmer, it will output directly according to the mains power waveform.

[0029] The EMC circuit mainly consists of a multi-stage filter circuit composed of capacitor CX1, inductor L1, inductor L2, capacitor C1, capacitor C2, and capacitor C8. The circuit composed of inductor L1 and capacitor C8 is mainly used to suppress radiated interference, while the circuit composed of capacitor CX1, capacitor C1, inductor L2, and capacitor C3 is mainly used to suppress conducted interference.

[0030] The surge protection circuit consists of resistors Fu, R1, RV1, capacitor CX1, rectifier bridge D1, transformer T1, and integrated circuit U1. It meets the 2.5kV ringing wave index and can prevent damage to the lamps caused by abnormal spike pulses from the power grid. When a spike pulse arrives, it will be suppressed in terms of amplitude by resistors Fu, R1, RV1, and capacitor CX1. The residual energy after suppression will be shared by rectifier bridge D1, transformer T1, and integrated circuit U1.

[0031] The temperature protection circuit consists of integrated circuit U1, resistors R10 and R11. When the combined junction temperature of U1, formed by the temperature information of the lamp and the power consumption of integrated circuit U1 itself, exceeds the rated 145 degrees Celsius, the primary temperature protection mode of U1 will be triggered. In this mode, the brightness of the lamp will gradually decrease. The protection mode can only be exited after the fault is cleared. When the combined junction temperature of U1 exceeds the rated 160 degrees Celsius, the advanced temperature protection mode of U1 will be triggered. In this mode, the lamp will be forcibly turned off. The lamp needs to be turned on again after the fault is cleared to exit the protection mode.

[0032] The infrared sensing circuit consists of transformer T1, diode D3, Zener diode ZD1, resistors R21, R22, R23, R25, and R28, adjustable potentiometer R24, transistor Q1, capacitors C9 and C10, infrared sensing integrated circuit U2, MOSFET Q2, and Zener diode ZD1; the specific model of integrated circuit U2 is NS412.

[0033] Pin 5 of transformer T1 is connected to the anode of diode D3. The cathode of diode D3 is connected to one end of resistor R21. The other end of resistor R21 is connected to one end of resistor R22 and the collector of transistor Q1. The other end of resistor R22 is connected to the base of transistor Q1. The base of transistor Q1 is also connected to the cathode of Zener diode ZD1. The anode of Zener diode ZD1 is grounded and connected to one end of capacitor C9. The emitter of transistor Q1 is connected to the other end of capacitor C9 and one end of capacitor C10. The other end of capacitor C10 is connected to the movable terminal of adjustable potentiometer R24 ​​and the GND terminal of infrared sensor integrated circuit U2. The GND terminal of the integrated circuit U2 is grounded; one fixed terminal of resistor R24 ​​is connected to one end of resistor R23 and the TON terminal of infrared sensing integrated circuit U2, and the other end of resistor R23 is connected to the VDD terminal of integrated circuit U2 and the emitter of transistor Q1; the REL terminal of infrared sensing integrated circuit U2 is connected to one end of resistor R25, and the other end of resistor R25 is connected to one end of resistor R28, one end of capacitor C11 and the gate of MOSFET Q2, and the other end of resistor R28 is connected to the other end of capacitor C11 and the source of MOSFET Q2 and grounded, and the drain of MOSFET Q2 is connected to the negative terminal of LED light source array.

[0034] The infrared sensing circuit consists of a transformer T1, a diode D3, a Zener diode ZD1, a resistor R21, a resistor R22, a transistor Q1, and a capacitor C9, forming a rectifier, filter, and step-down circuit to provide a constant voltage source for the infrared control circuit.

[0035] By selecting the adjustable potentiometer R24, the resistance value of R24 can be adjusted, thereby adjusting the infrared sensing time.

[0036] Resistors R25 and R28, along with MOSFET Q2, form a control switch circuit. When the lamp senses a changing infrared signal from the outside world through the Fresnel lens and infrared sensing integrated circuit U2, U2 will send a high-level signal, causing MOSFET Q2 to be in a conducting state. This conducting state will be maintained for a period of time, which is set by the resistance value of the selectable adjustable potentiometer R24.

[0037] The infrared sensing device includes a Fresnel lens, which reflects pyroelectric infrared signals onto the infrared sensing integrated circuit U2.

[0038] The Fresnel lens has two functions: first, it focuses the infrared signal, refracting (reflecting) it onto the infrared sensing integrated circuit U2; second, it divides the detection area into several bright and dark areas, so that moving objects entering the detection area can generate changes in the infrared sensing integrated circuit U2 in the form of temperature changes, thereby enhancing the infrared signal and making it easier to identify, which is to say, enhancing the signal.

[0039] The infrared sensor integrated circuit U2 is responsible for detecting infrared signals. After detecting the signal, it outputs a high-level control signal. The duration of this control signal is set according to the ratio of the mutual resistance values ​​of the external resistor R23 and the adjustable potentiometer R24. It is preferable that the resistance value of R23 is fixed, so the lighting time of 2 seconds to 1 hour can be obtained by simply adjusting the resistance value of R24.

[0040] The Fresnel lens is made of HDPE (high-density polyethylene) SH3000. One side of the lens surface is smooth, while the other side is engraved with concentric circles of varying sizes. Its texture is designed based on light interference and scattering, as well as relative sensitivity and receiving angle requirements. In this embodiment, the lens detection angle is 120 degrees and the detection distance is 8m.

[0041] The luminaire also includes a sensing time control knob connected to an adjustable potentiometer R24.

[0042] The output open-circuit and short-circuit protection circuit consists of integrated circuit U1, resistors R7, R8 and R9. One end of resistor R7 is connected to the cathode of diode D2, the other end of resistor R7 is connected to one end of resistor R8, the other end of resistor R8 is connected to one end of resistor R9, and the other end of resistor R9 is grounded.

[0043] When the system is in an open-circuit or short-circuit condition, the corresponding signal is transmitted to the integrated circuit U1 through resistors R7, R8, and R9. The integrated circuit U1 will control the circuit output according to different states, and it can only work again after the fault is cleared.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A silicon controlled rectifier (SCR) dimming and infrared sensing disc lamp, characterized in that: The application relates to a LED lamp, which comprises an EMC circuit, a dimming circuit, an infrared induction control circuit, an infrared induction device, a protection circuit and an LED light source array; the dimming circuit is used for determining whether the lamp is connected with a silicon-controlled dimmer, and adjusting corresponding working modes according to the connection state; the infrared induction device is used for reflecting infrared signals to the infrared induction control circuit; the infrared induction control circuit is used for detecting the infrared signals and controlling the on-off of the LED light source array according to the infrared signals; the EMC circuit is used for preventing the equipment from being interfered by other equipment and preventing the equipment from interfering other equipment; the protection circuit comprises an open circuit and short circuit protection circuit, an over-temperature protection circuit, an over-current protection circuit and a surge protection circuit, and is used for preventing possible circuit faults.

2. The triac dimmable and infrared induction disc lamp according to claim 1, characterized in that: The dimming circuit comprises an integrated circuit U1, a resistor Fu, a resistor R1, a resistor R2, a capacitor C2, a transformer T1, a capacitor C6 and a capacitor C7; the EMC circuit comprises a capacitor CX1, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2 and a capacitor C8; the surge protection circuit comprises the resistor Fu, the resistor R1, a resistor RV1, the capacitor CX1, a rectifier bridge D1, the transformer T1 and the integrated circuit U1; the over-temperature protection circuit comprises the integrated circuit U1, a resistor R10 and a resistor R11. The AC interface AC1 is connected with one end of the resistor Fu, the other end of the resistor Fu is connected with one end of the resistor RV1 and the No. 3 pin of the inductor L1, the AC interface AC2 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the other end of the resistor RV1 and the No. 1 pin of the inductor L1, the No. 4 pin of the inductor L1 is connected with one end of the capacitor CX1 and the No. 4 pin of the rectifier bridge D1, the No. 2 pin of the inductor L1 is connected with the other end of the capacitor CX1 and the No. 3 pin of the rectifier bridge D1, the No. 1 pin of the rectifier bridge D1 is connected with one end of the inductor L2 and one end of the capacitor C1, the other end of the inductor L2 is connected with one end of the resistor R2, one end of the capacitor C3 and the No. 4 pin of the transformer T1, the No. 2 pin of the rectifier bridge D1 is connected with the other end of the capacitor C1, one end of the capacitor C2 and the other end of the capacitor C3 and grounded, the other end of the capacitor C2 is connected with the other end of the resistor R2; the No. 3 pin of the transformer T1 is connected with the No. 8 pin of the integrated circuit U1 and the anode of the diode D2, the No. 6 pin of the integrated circuit U1 is connected with one end of the resistor R10 and one end of the resistor R11, the other end of the resistor R10 and the other end of the resistor R11 are grounded, the No. 4 pin of the integrated circuit U1 is grounded, the No. 3 pin of the integrated circuit U1 is connected with one end of the capacitor C5, the other end of the capacitor C5 is grounded, the No. 2 pin of the integrated circuit U1 is connected with one end of the resistor R6, the other end of the resistor R6 is grounded, the No. 1 pin of the integrated circuit U1 is connected with one end of the capacitor C4, one end of the resistor R3 and one end of the resistor R4, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is connected with the No. 4 pin of the transformer T1 and one end of the capacitor C8, the other end of the capacitor C8 is connected with one end of the resistor R5 and the cathode of the diode D2, the other end of the resistor R5 is connected with the other end of the resistor R4, the cathode of the diode D2 is connected with the positive electrode of the LED light source array.

3. The triac dimmable and infrared sensing disc lamp according to claim 2, wherein: The infrared induction circuit comprises a transformer T1, a diode D3, a voltage stabilizing tube ZD1, a resistor R21, a resistor R22, a resistor R23, a resistor R25, a resistor R28, an adjustable potentiometer R24, a triode Q1, a capacitor C9, a capacitor C10, an infrared induction integrated circuit U2, a MOS tube Q2 and a voltage stabilizing diode ZD1. The No. 5 pin of the transformer T1 is connected to the anode of the diode D3, one end of the resistor R21 is connected to the cathode of the diode D3 and the collector of the triode Q1, the other end of the resistor R21 is connected to the other end of the resistor R22 and the base of the triode Q1, the base of the triode Q1 is also connected to the cathode of the voltage stabilizing diode ZD1, the anode of the voltage stabilizing diode ZD1 is grounded and connected to one end of the capacitor C9, the emitter of the triode Q1 is connected to the other end of the capacitor C9 and one end of the capacitor C10, the other end of the capacitor C10 is connected to the movable terminal of the adjustable potentiometer R24 and the GND terminal of the infrared sensing integrated circuit U2, and the GND terminal of the integrated circuit U2 is grounded; one fixed terminal of the resistor R24 is connected to one end of the resistor R23 and the TON terminal of the infrared sensing integrated circuit U2, the other end of the resistor R23 is connected to the VDD terminal of the integrated circuit U2 and the emitter of the triode Q1; the REL terminal of the infrared sensing integrated circuit U2 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to one end of the resistor R28, one end of the capacitor C11 and the gate of the MOS tube Q2, the other end of the resistor R28 is connected to the other end of the capacitor C11 and the source of the MOS tube Q2 and grounded, and the drain of the MOS tube Q2 is connected to the negative electrode of the LED light source array.

4. The triac dimmable and infrared sensing disc lamp according to claim 2, wherein: The infrared sensing device comprises a Fresnel lens (1) which can reflect the heat release infrared signal to the infrared sensing integrated circuit U2.

5. The triac dimmable and infrared sensing disc lamp according to claim 2, wherein: The lamp also comprises an induction time control knob (2) connected to the adjustable potentiometer R24.

6. The triac dimmable and infrared sensing disc lamp according to claim 2, wherein: The output open circuit and short circuit protection circuit is composed of the integrated circuit U1, the resistor R7, the resistor R8 and the resistor R9, one end of the resistor R7 is connected to the cathode of the diode D2, the other end of the resistor R7 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to one end of the resistor R9, and the other end of the resistor R9 is grounded.

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