Non-contact alternating current lamp dimming circuit and lamp

Abstract

The utility model discloses a non-contact alternating current lamp dimming circuit and a lamp. The non-contact alternating current lamp dimming circuit comprises a rectifying circuit, a voltage stabilizing circuit, an MCU circuit, a photoelectric detection circuit and a power switch driving circuit, the photoelectric detection circuit comprises an infrared transmitting unit, a first infrared receiving unit and a second infrared receiving unit; when the obstacle is located at the first position, the infrared emitting unit emits infrared rays to irradiate the obstacle, and the infrared rays are reflected back and received by the first infrared receiving unit to change signals of the first infrared receiving unit. When the obstacle is located at the second position, the infrared emitting unit emits infrared rays to irradiate the obstacle, and the infrared rays are reflected back and received by the second infrared receiving unit to change signals; the MCU circuit defines the increase and decrease of the brightness of the lamp according to the sequence of signal changes of the first infrared receiving unit and the second infrared receiving unit, and defines the dimming quantity value according to the time difference of the signal changes of the first infrared receiving unit and the second infrared receiving unit, thereby controlling the power switch driving circuit, and achieving the dimming of the lamp.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a non-contact AC lighting dimming circuit and lighting fixture. Background Technology

[0002] Current lighting fixtures generally use contact dimming, for example, the dimming circuit of a typical AC light uses a potentiometer for manual dimming, which has several major drawbacks:

[0003] 1. Unsatisfactory stability: As a mechanical component, the contact resistance of a potentiometer may change with time and frequency of use, leading to unstable dimming effects. Furthermore, the relationship between the potentiometer's rotation position and the output voltage or current may not be linear, which affects the accuracy of dimming.

[0004] 2. Limited adjustment range: The adjustment range of potentiometers is usually limited by their physical size and manufacturing process, which may prevent them from providing very fine brightness adjustment. This limitation is particularly pronounced in applications that require precise control.

[0005] 3. Safety and hygiene are not ideal: Since manual operation is required, hygiene problems are likely to arise. In addition, although the circuit board is insulated, water from the operator's hands may still get onto the circuit board, causing a safety accident.

[0006] In recent years, some non-contact dimming lamps have appeared on the market. For example, they use infrared light reflection to adjust the brightness of the lamps. An infrared emitting diode emits an infrared signal to an obstacle. The infrared signal is reflected back after encountering the obstacle and received by an infrared receiving diode in the infrared receiving circuit unit. The infrared receiving diode then transmits the signal to the signal amplification circuit unit. The signal amplification circuit unit amplifies the received infrared signal and transmits it to the modulation unit. The modulation unit demodulates the received infrared signal. If the infrared signal matches the modulation frequency, the infrared modulation and demodulation circuit unit controls the logic output unit to output a logic signal to the logic processing circuit unit. The logic processing circuit unit judges and processes the logic signal. The time the obstacle is stationary (i.e., the time it reflects the infrared signal) determines the duration of the logic signal. The programmable chip in the logic processing circuit unit defines three gestures to control the LED lamp group based on the duration of the logic signal. The three gestures correspond to brightness adjustment, on / off operation, and delay operation, respectively, with the duration increasing. The brightness adjustment operation is achieved by using a PWM square wave output from a programmable chip in conjunction with the voltage control of the field-effect transistor in the voltage control circuit unit. The PWM square wave is output to the control terminal of the field-effect transistor, and the logic processing unit adjusts the brightness of the LED group by controlling the conduction time of the field-effect transistor.

[0007] Although non-contact dimming can be achieved using gestures, its dimming logic is complex, requiring users to remember multiple gestures. Moreover, it only offers brightness adjustment, on / off operation, and delay operation, and cannot reduce the brightness of the light fixture, thus affecting the user experience.

[0008] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0009] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide a non-contact AC lamp dimming circuit and lamp. Through the setting of an infrared emitting unit, a first infrared receiving unit, and a second infrared receiving unit, the MCU circuit defines the increase or decrease of the lamp brightness according to the order of the signal changes of the first infrared receiving unit and the second infrared receiving unit, and defines the dimming value by the time difference between the two signal changes, thereby controlling the power switch drive circuit to realize non-contact dimming of the lamp. It is convenient, safe, hygienic, and fun to operate.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A non-contact AC lamp dimming circuit includes a rectifier circuit, a voltage regulator circuit, an MCU circuit, a photoelectric detection circuit, and a power switch drive circuit; the output terminal of the rectifier circuit is connected to the voltage regulator circuit, the voltage regulator circuit is connected to the MCU circuit and the photoelectric detection circuit respectively; the MCU circuit is connected to the photoelectric detection circuit and the power switch drive circuit respectively.

[0012] The photoelectric detection circuit includes an infrared emitting unit, a first infrared receiving unit, and a second infrared receiving unit. When the obstruction is in the first position, the infrared emitting unit emits infrared rays that illuminate the obstruction. At least a portion of the infrared rays are reflected back by the obstruction and received by the first infrared receiving unit, causing a change in its signal. When the obstruction is in the second position, the infrared emitting unit emits infrared rays that illuminate the obstruction. At least a portion of the infrared rays are reflected back by the obstruction and received by the second infrared receiving unit, causing a change in its signal.

[0013] The MCU circuit defines the increase or decrease of the lamp brightness according to the order of the signal changes of the first infrared receiving unit and the second infrared receiving unit, and defines the dimming value according to the time difference of the signal changes of the first infrared receiving unit and the second infrared receiving unit, thereby controlling the power switch drive circuit.

[0014] As a preferred embodiment, the time difference between the signal changes of the first infrared receiving unit and the second infrared receiving unit is inversely proportional to the dimming value.

[0015] As a preferred embodiment, the output of the rectifier circuit is also connected to a zero-crossing detection circuit; the MCU circuit is connected to the zero-crossing detection circuit, and the MCU circuit starts detecting the signal changes of the first infrared receiving unit and the second infrared receiving unit based on the AC zero-crossing signal fed back by the zero-crossing detection circuit.

[0016] As a preferred embodiment, the zero-crossing detection circuit includes a transistor Q2. When the AC current crosses the zero point, the base B of the transistor Q2 is at a low level, and the collector C of the transistor Q2 is at a high level. Then, the MCU circuit starts detecting the signal changes of the first infrared receiving unit and the second infrared receiving unit based on the high-level signal.

[0017] As a preferred embodiment, the MCU circuit includes an MCU chip, which has an AC test pin, a test1 pin, a test2 pin, a PWM0 pin, and a PWM1 pin. The AC test pin is connected to the collector C of the transistor Q2, the test1 pin is connected to the first infrared receiving unit, the test2 pin is connected to the second infrared receiving unit, and the PWM0 pin is connected to the power switch drive circuit.

[0018] Furthermore, the photoelectric detection circuit also includes a transistor Q4, the PWM1 pin of the MCU chip is connected to the base B of the transistor Q4, and the collector C of the transistor Q4 is connected to the infrared emitting unit.

[0019] As a preferred embodiment, the power switch drive circuit includes a MOSFET Q3, and the PWM0 pin of the MCU chip is connected to the gate G of the MOSFET Q3.

[0020] As a preferred embodiment, the voltage regulator circuit includes a Zener diode and an NMOS transistor Q1. The source S of the NMOS transistor Q1 is connected to the VIN pin of the Zener diode, the gate G of the NMOS transistor Q1 is connected to the VOUT pin of the Zener diode, and the output terminal of the rectifier circuit is connected to the drain D of the NMOS transistor Q1.

[0021] As a preferred embodiment, the rectifier circuit, the voltage regulator circuit, the MCU circuit, the photoelectric detection circuit, and the power switch drive circuit are all mounted on the same circuit board;

[0022] or,

[0023] The rectifier circuit, the voltage regulator circuit, the MCU circuit, and the power switch drive circuit are all located on the same circuit board, while the photoelectric detection circuit is located on another circuit board.

[0024] As a preferred embodiment, the infrared emitting unit is located between the first infrared receiving unit and the second infrared receiving unit.

[0025] A lighting fixture includes a light source and a dimming circuit connected to the light source, wherein the dimming circuit is a non-contact AC lighting fixture dimming circuit as described in any of the preceding claims; and the power switch drive circuit is connected to the light source.

[0026] Compared with the prior art, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly involves the setting of a rectifier circuit, a voltage regulator circuit, an MCU circuit, a photoelectric detection circuit, and a power switch drive circuit. The photoelectric detection circuit includes an infrared emitting unit, a first infrared receiving unit, and a second infrared receiving unit. When the obstruction is in the first position, the infrared emitting unit emits infrared rays that illuminate the obstruction. The infrared rays are reflected back and received by the first infrared receiving unit, causing a signal change. When the obstruction is in the second position, the infrared emitting unit emits infrared rays that illuminate the obstruction. The infrared rays are reflected back and received by the second infrared receiving unit, causing a signal change. The MCU circuit defines the increase or decrease of the lamp's brightness based on the order of signal changes from the first and second infrared receiving units, and defines the dimming value based on the time difference between the two signal changes. This controls the power switch drive circuit, achieving non-contact dimming of the lamp. It is convenient, safe, hygienic, and also fun to operate.

[0027] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0028] Figure 1 This is a detailed schematic diagram of the non-contact AC lamp dimming circuit according to Embodiment 1 of this utility model;

[0029] Figure 2 This is a schematic diagram of the arrangement of the infrared emitting unit LED1, the first infrared receiving unit D1, and the second infrared receiving unit D2 on the circuit board according to Embodiment 1 of this utility model.

[0030] Figure 3 This is a schematic diagram of the main circuit connection of the lamp according to Embodiment 1 of this utility model;

[0031] Figure 4 This is a detailed schematic diagram of the non-contact AC lamp dimming circuit according to Embodiment 2 of this utility model. Detailed Implementation

[0032] Please refer to Figures 1 to 3 As shown, it illustrates the specific structure of Embodiment 1 of this utility model.

[0033] A non-contact AC lamp dimming circuit includes a rectifier circuit (different rectification methods can be used; in this embodiment, a bridge rectifier circuit is specifically used, which is a common rectification method that is simple to manufacture and highly efficient. However, it is not a limitation in actual design.), a voltage regulator circuit, an MCU circuit, a photoelectric detection circuit, and a power switch drive circuit. The output terminal of the rectifier circuit is connected to the voltage regulator circuit, which is connected to both the MCU circuit and the photoelectric detection circuit to provide operating voltages to them respectively. The MCU circuit is connected to both the photoelectric detection circuit and the power switch drive circuit.

[0034] The photoelectric detection circuit includes an infrared emitting unit (including an infrared emitting tube), a first infrared receiving unit (including an infrared receiving tube), and a second infrared receiving unit (including an infrared receiving tube). When an obstruction (such as a hand or other object) is in a first position, the infrared emitting unit emits infrared rays that illuminate the obstruction. At least a portion of the infrared rays are reflected back by the obstruction and received by the first infrared receiving unit, causing a change in its signal. When the obstruction is in a second position, the infrared emitting unit emits infrared rays that illuminate the obstruction. At least a portion of the infrared rays are reflected back by the obstruction and received by the second infrared receiving unit, causing a change in its signal. Preferably, the infrared emitting unit is located between the first infrared receiving unit and the second infrared receiving unit, and is preferably centrally located. When actually installing the infrared emitting unit, a light-blocking sleeve can be added to the light-emitting cap of its infrared emitting tube to make the emitted infrared light diverge forward and reduce the influence of side light on the main recognition. If the lamp head structure causes the orientation of the infrared emitting tube to be mismatched with the first infrared receiving unit and the second infrared receiving unit, a right-angle light guide can be used to guide the emitted light and the received emitted light to adapt to the installation of various dimming lamps.

[0035] The MCU circuit defines the increase or decrease of lamp brightness based on the sequence of signal changes from the first and second infrared receiving units (e.g., if the first infrared receiving unit signal changes first, followed by the second, it's defined as an increase in brightness; conversely, if the second infrared receiving unit signal changes first, followed by the first, it's defined as a decrease in brightness). Furthermore, it defines the dimming value for a single operation based on the time difference between the signal changes from the first and second infrared receiving units. Thus, based on two parameters (1. form of brightness change: increase or decrease; 2. magnitude of brightness change: dimming value), the power switch drive circuit is controlled to adjust the lamp brightness. It is evident that only when both the first and second infrared receiving units show signal changes with a time difference is it considered that the user is performing a dimming operation, and the MCU circuit controls the power switch drive circuit accordingly. Otherwise, it is considered that no dimming operation has occurred, and the power switch drive circuit remains in its original state. Specifically, in this embodiment, the time difference between the signal changes of the first infrared receiving unit and the second infrared receiving unit is inversely proportional to the single dimming value; that is, the smaller the time difference, the larger the dimming value. In use, when a hand or other object is waved in front of the detection window, a faster wave results in a larger dimming value, potentially reaching the state of turning off the light or maximum brightness; a slower wave results in a smaller dimming value, with less change in the light's brightness, which is considered fine-tuning.

[0036] Furthermore, the output of the rectifier circuit is also connected to a zero-crossing detection circuit; the MCU circuit is connected to the zero-crossing detection circuit. There are two zero-crossing detection signals within one AC cycle. Based on the AC zero-crossing signal fed back by the zero-crossing detection circuit, the MCU circuit initiates the detection of signal changes in the first infrared receiving unit and the second infrared receiving unit. This ensures that the MCU circuit executes only two infrared emission and reflection detection procedures in each AC cycle (detecting signal changes in the first and second infrared receiving units each time), guaranteeing system optimization. In this embodiment, the zero-crossing detection circuit includes a transistor Q2. The signal is input from the base B, output from the collector C, and the emitter E is grounded. When the AC current crosses zero (or approaches zero), the base B of transistor Q2 is at a low level, and the collector C of transistor Q2 is at a high level (conversely, it is at a low level). The MCU circuit then initiates the detection of signal changes in the first and second infrared receiving units based on this high-level signal. In other embodiments, the zero-crossing detection circuit may also employ a zero-crossing detection chip, such as the GS1102, which is a chip specifically designed for zero-crossing detection circuits. Based on the AC zero-crossing signal, the MCU circuit calculates whether the AC frequency is 50 Hz or 60 Hz, and calculates the time interval between two AC zero-crossing signals (a time interval of 20 ms corresponds to 50 Hz; a time interval of 16.67 ms corresponds to 60 Hz).

[0037] The MCU circuit includes an MCU chip with an AC test pin (serving as an I / O port, which has an input pull-up attribute, typically configured via a register; alternatively, a physical resistor can be added, for example, to the collector C of transistor Q2), a test1 pin, a test2 pin, a PWM0 pin, a PWM1 pin, a VDD pin, and a GND pin. The AC test pin is connected to the collector C of transistor Q2 in the zero-crossing detection circuit. The test1 pin is connected to the first infrared receiving unit, the test2 pin is connected to the second infrared receiving unit, and the PWM0 pin is connected to the power switch drive circuit. If the lamp power supply voltage is increased, the duty cycle of the output power MOSFET Q3 is increased. PWM (Pulse Width Modulation) technology is used to achieve a more efficient, precise, and stable dimming effect. Considering over-temperature protection for the circuit board, an NTC resistor is also connected to the MCU chip in this embodiment.

[0038] The photoelectric detection circuit also includes a transistor Q4. The PWM1 pin of the MCU chip is connected to the base B of the transistor Q4, and the collector C of the transistor Q4 is connected to the infrared emitting unit. In actual use, for example, after the AC zero-crossing signal arrives, the MCU chip drives the transistor Q4 to run for 1ms and simultaneously detects the signal changes of the first infrared receiving unit and the second infrared receiving unit.

[0039] The power switch drive circuit includes a MOSFET Q3. The three main electrodes of MOSFET Q3 are: source (S), drain (D), and gate (G). The PWM0 pin of the MCU chip is connected to the gate (G) of MOSFET Q3 in the power switch drive circuit, and the drain (D) of MOSFET Q3 is connected to the lamp interface JP1. MOSFET Q3 is driven after the AC power crosses zero (assuming light output is required; otherwise, MOSFET Q3 is not driven). Based on the need to increase or decrease light intensity, the driving time of the mains sine wave after rectification and voltage change is shortened to achieve dimming.

[0040] The voltage regulator circuit includes a three-terminal Zener diode (e.g., HT50) and an NMOS transistor Q1. The Zener diode has a VIN pin, a VOUT pin, and a ground pin. The source (S) of the NMOS transistor Q1 is connected to the VIN pin of the Zener diode, and the gate (G) of the NMOS transistor Q1 is connected to the VOUT pin of the Zener diode. The output of the rectifier circuit is connected to the drain (D) of the NMOS transistor Q1. Using the NMOS transistor Q1, infrared emission detection is performed before the AC voltage rises to a certain level (e.g., between 10V and 30V). The infrared emission time is approximately 1ms, during which the current consumption is around 20mA. At this time, the NMOS transistor Q1 can regulate a large current with a low voltage drop, effectively reducing power consumption on Q1 and ensuring reliability. This high-voltage buck regulator circuit provides a relatively stable power supply to the MCU circuit. To overcome the problem of the NMOS transistor Q1 easily overheating when the AC amplitude is high, the infrared light emission time can be controlled by the MCU circuit. In this embodiment, the voltage regulator circuit is provided with multiple power supply terminals, such as a +5V power supply terminal and a VDD power supply terminal. The +5V power supply terminal is connected to the MCU circuit, the first infrared receiving unit and the second infrared receiving unit of the photoelectric detection circuit, respectively. The first infrared receiving unit and the second infrared receiving unit are connected in parallel and each is connected in series with a resistor. The VDD power supply terminal is connected to the infrared emitting unit LED1 to power its circuit.

[0041] Typically, this type of non-contact AC lamp dimming circuit is installed on the lamp post of a table lamp or wall lamp, which is convenient, safe and hygienic to use. The rectifier circuit, the voltage regulator circuit, the MCU circuit, the photoelectric detection circuit and the power switch drive circuit are all set on the same circuit board.

[0042] or,

[0043] The rectifier circuit, the voltage regulator circuit, the MCU circuit, and the power switch drive circuit are all mounted on the same circuit board, while the photoelectric detection circuit is mounted on another circuit board. This design allows for better adaptation to various structural shapes of dimming lamps.

[0044] like Figure 1 As shown, in this embodiment, the entire circuit can be divided into multiple circuit modules: the rectifier circuit and the zero-crossing detection circuit are combined into one circuit module, namely the AC rectification and zero-crossing detection circuit 101; the voltage regulator circuit is designed as a high-voltage step-down voltage regulator circuit 102; the photoelectric detection circuit 103 is combined into one circuit module; the MCU circuit 104 is combined into one circuit module; and the power switch drive circuit 105 is combined into one circuit module. The connection relationship between each circuit module can be reflected by the corresponding labels.

[0045] like Figure 4 As shown, it displays a detailed schematic diagram of the contactless AC lamp dimming circuit of Embodiment 2; the main difference between it and the circuit of Embodiment 1 is:

[0046] The circuit containing the infrared emitting unit LED1 draws power from the V+ power supply terminal after the bridge rectifier circuit. Meanwhile, the resistance value of the resistor R10 connected in series with the infrared emitting unit LED1, and the resistance values ​​of the resistors R9 and R11 connected in series with the first infrared receiving unit D1 and the second infrared receiving unit D2 are different (of course, in the actual circuit design, the resistance values ​​can be flexibly set and are not limited to the values ​​shown on the circuit schematic).

[0047] Of course, if the power supply or other details of the circuit are adjusted or changed, without changing the main components of the circuit, namely the rectifier circuit, voltage regulator circuit, MCU circuit, photoelectric detection circuit, and power switch drive circuit, the photoelectric detection circuit can include an infrared emitting unit, a first infrared receiving unit, and a second infrared receiving unit. The MCU circuit can define the increase or decrease of the lamp brightness according to the order of the signal changes of the first infrared receiving unit and the second infrared receiving unit, and define the dimming value according to the time difference of the signal changes of the first infrared receiving unit and the second infrared receiving unit, thereby controlling the power switch drive circuit to achieve dimming of the lamp. All of these should fall within the scope of the present utility model.

[0048] Next, a lamp is provided, including a light source and a dimming circuit connected to the light source, wherein the dimming circuit is a non-contact AC lamp dimming circuit as described in any of the preceding claims; the power switch drive circuit is connected to the light source.

[0049] It should be noted that the type and shape of the lamps are not limited, and can refer to table lamps, wall lamps, pendant lamps, ceiling lamps, floor lamps, etc. As mentioned above, the dimming circuit of this non-contact AC lamp is installed on the lamp post of a table lamp or wall lamp, etc. However, the installation position of the photoelectric detection circuit can be flexibly arranged according to the specific shape of the lamp to facilitate user operation.

[0050] The key design feature of this invention lies in its integration of a rectifier circuit, a voltage regulator circuit, an MCU circuit, a photoelectric detection circuit, and a power switch drive circuit. The photoelectric detection circuit includes an infrared emitting unit, a first infrared receiving unit, and a second infrared receiving unit. When an obstacle is in a first position, the infrared emitting unit emits infrared light that illuminates the obstacle. The reflected infrared light is then received by the first infrared receiving unit, causing a signal change. When the obstacle is in a second position, the infrared emitting unit emits infrared light that illuminates the obstacle. The reflected infrared light is then received by the second infrared receiving unit, causing a signal change. The MCU circuit defines the increase or decrease in lamp brightness based on the order of signal changes from the first and second infrared receiving units, and defines the dimming value based on the time difference between the two signal changes. This controls the power switch drive circuit, enabling non-contact dimming of the lamp. This method is convenient, safe, hygienic, and also adds a fun element.

[0051] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A non-contact AC lamp dimming circuit, characterized by: The rectifier circuit, the voltage stabilizing circuit, the MCU circuit, the photoelectric detection circuit and the power switch driving circuit are connected with each other. The photoelectric detection circuit comprises an infrared emitting unit, a first infrared receiving unit and a second infrared receiving unit. When the barrier is located at the first position, the infrared emitting unit emits infrared rays onto the barrier, at least part of the infrared rays is reflected by the barrier and received by the first infrared receiving unit, causing the signal change of the first infrared receiving unit.

2. A non-contact AC lamp dimming circuit according to claim 1, characterized in that: The MCU circuit defines the increase and decrease of the luminance of the lamp according to the sequence of the signal changes of the first infrared receiving unit and the second infrared receiving unit, and defines the dimming value according to the time difference of the signal changes of the first infrared receiving unit and the second infrared receiving unit, thereby controlling the power switch driving circuit.

3. A non-contact AC lamp dimming circuit according to claim 1 or 2, characterized in that: The time difference of the signal changes of the first infrared receiving unit and the second infrared receiving unit is inversely proportional to the dimming value.

4. A non-contact AC lamp dimming circuit according to claim 3, wherein: The output end of the rectifier circuit is further connected with a zero-crossing detection circuit.

5. A non-contact AC lamp dimming circuit according to claim 4, wherein: The MCU circuit is connected with the zero-crossing detection circuit, and the MCU circuit starts to detect the signal changes of the first infrared receiving unit and the second infrared receiving unit according to the alternating current zero-crossing signal fed back by the zero-crossing detection circuit. The zero-crossing detection circuit comprises a transistor Q2.

6. A non-contact AC lamp dimming circuit according to claim 5, wherein: The MCU circuit comprises an MCU chip, the MCU chip has an AC test pin, a test1 pin, a test2 pin, a PWM0 pin and a PWM1 pin, the AC test pin is connected with the collector C of the transistor Q2, the test1 pin is connected with the first infrared receiving unit, the test2 pin is connected with the second infrared receiving unit, and the PWM0 pin is connected with the power switch driving circuit. The photoelectric detection circuit further comprises a transistor Q4, the PWM1 pin of the MCU chip is connected with the base B of the transistor Q4, and the collector C of the transistor Q4 is connected with the infrared emitting unit. The power switch driving circuit comprises a MOS transistor Q3, and the PWM0 pin of the MCU chip is connected with the gate G of the MOS transistor Q3.

7. A non-contact AC lamp dimmer circuit according to claim 1, wherein: The voltage stabilizing circuit comprises a three-terminal voltage stabilizing tube and an NMOS tube Q1, a source S of the NMOS tube Q1 is connected to a VIN pin of the three-terminal voltage stabilizing tube, a gate G of the NMOS tube Q1 is connected to a VOUT pin of the three-terminal voltage stabilizing tube, and an output end of the rectifying circuit is connected to a drain D of the NMOS tube Q1.

8. A non-contact AC lamp dimmer circuit according to claim 1, wherein: The rectifying circuit, the voltage stabilizing circuit, the MCU circuit, the photoelectric detection circuit and the power switch driving circuit are arranged on the same circuit board. Alternatively, The rectifying circuit, the voltage stabilizing circuit, the MCU circuit and the power switch driving circuit are arranged on the same circuit board, and the photoelectric detection circuit is arranged on another circuit board.

9. A non-contact AC lamp dimmer circuit according to claim 1, wherein: The infrared emitting unit is located between the first infrared receiving unit and the second infrared receiving unit.

10. A luminaire characterized by: The power switch driving circuit is connected to the light source. The power switch driving circuit is connected to the light source.

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