Lamp power supply circuit and lamp

Abstract

The embodiment of the utility model provides a lamp power supply circuit and a lamp. The lamp power supply circuit is characterized in that the input end of an input circuit is coupled with an external power supply; according to the power supply chip, an output end of an input circuit is coupled to a power supply input end through a rectifier bridge and a first resistor in sequence; the output end of the power supply chip is coupled with the cathode of the light-emitting unit; the anode of the light-emitting unit is coupled with the output end of the rectifier bridge; according to the feedback chip, a power supply chip power supply end is coupled with a feedback chip power supply end through a power supply circuit, and the power supply chip power supply end is grounded through a first capacitor; the sensing input end is coupled with the sensing chip; the light detection input end is coupled with the light detection circuit; the feedback output end is coupled with the feedback input end; the feedback chip generates a feedback signal according to the trigger signal input by the sensing input end and the optical signal intensity input by the optical detection input end; the power supply chip adjusts the light intensity of the light-emitting unit according to the feedback signal.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply circuits, and in particular to a lamp power supply circuit and a lamp. Background Art

[0002] Although the current lamp power circuit design on the market has been widely used in various lighting systems, it still faces several technical limitations and challenges, especially in terms of intelligent control, energy efficiency optimization and environmental adaptability. Most of the lamp power circuits in related technologies focus on basic power conversion and supply, while the intelligent adjustment capability of light source brightness and the response sensitivity to external conditions are still insufficient.

[0003] In the power circuit design of many related technologies, the feedback adjustment mechanism is relatively simple, mainly relying on a preset voltage or current threshold to control the brightness of the light-emitting unit, and lacks the ability to dynamically adapt to changes in the actual lighting environment. This static adjustment method cannot effectively utilize ambient light information, resulting in high energy consumption in an environment with sufficient light, thereby increasing unnecessary energy consumption. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the related art, the purpose of the present disclosure is to provide a lamp power supply circuit and a lamp to solve the problems in the related art.

[0005] A first aspect of the present disclosure provides a lamp power supply circuit, which is applied to a lamp; comprising a main control circuit and a feedback circuit;

[0006] The main control circuit comprises:

[0007] An input circuit, an input terminal of the input circuit being coupled to an external power source;

[0008] A power chip, comprising: a power input terminal, a power chip output terminal, a power chip power supply terminal and a feedback input terminal;

[0009] The output end of the input circuit is coupled to the power input end via a rectifier bridge and a first resistor in sequence;

[0010] The output end of the power chip is coupled to the cathode of the light emitting unit, and the anode of the light emitting unit is coupled to the output end of the rectifier bridge;

[0011] The feedback circuit comprises:

[0012] A feedback chip, the feedback chip comprising a feedback chip power supply terminal, a sensing input terminal, a light detection input terminal and a feedback output terminal;

[0013] The power supply end of the power chip is coupled to the power supply end of the feedback chip through a power supply circuit, and the power supply end of the power chip is grounded through a first capacitor;

[0014] The sensing input terminal is coupled to the sensing chip; the light detection input terminal is coupled to the light detection circuit; the feedback output terminal is coupled to the feedback input terminal;

[0015] The feedback chip generates a feedback signal according to the trigger signal input from the sensing input terminal or the intensity of the light signal input from the light detection input terminal; and the power chip adjusts the light intensity of the light emitting unit according to the feedback signal.

[0016] Optionally, the input circuit includes:

[0017] A neutral line input terminal, the neutral line input terminal is coupled to external alternating current, and is coupled to the input terminal of the rectifier bridge through a fuse;

[0018] A live wire input terminal, the live wire input terminal is coupled to an input terminal of the rectifier bridge;

[0019] An adjustable resistor is coupled between the live line input terminal and the neutral line input terminal, and is coupled to the input terminal of the rectifier bridge.

[0020] Optionally, the power supply circuit includes:

[0021] A conversion chip, the conversion chip comprising a chip input terminal, a first chip ground terminal and a chip output terminal; the chip input terminal is coupled to the power supply terminal of the power chip through a second resistor, the first chip ground terminal is grounded, and the chip output terminal is coupled to the feedback chip power supply terminal to supply power to the feedback chip;

[0022] A second capacitor, one end of the second capacitor is coupled to the chip input terminal, and the other end of the second capacitor is grounded;

[0023] A fourth capacitor, one end of which is coupled to the chip output end, and the other end of which is grounded.

[0024] Optionally, the sensing chip includes: a chip power supply terminal, a chip feedback terminal and a second chip ground terminal, the chip power supply terminal is coupled to the output terminal of the power supply circuit and is grounded through a sixth capacitor; the chip feedback terminal is coupled to the sensing input terminal through a third resistor.

[0025] Optionally, the feedback chip also includes an operating end, which is coupled to an operating unit through a fourth resistor; the feedback chip generates an adjustment signal according to an operation signal fed back by the operating unit, and adjusts the light intensity of the light-emitting unit according to the adjustment signal through the power supply chip.

[0026] Optionally, the feedback chip further includes a sensitivity adjustment terminal, which is grounded via a seventh capacitor, and the sensitivity adjustment terminal is used to adjust the sensitivity of the operating unit.

[0027] Optionally, the feedback chip further includes: a light detection power supply terminal, the light detection power supply terminal being coupled to the light detection circuit;

[0028] The light detection circuit comprises: a light intensity sensor, an input end of the light intensity sensor is coupled to the light detection power supply end, an output end of the light intensity sensor is coupled to the light detection input end and / or is grounded through a fifth resistor;

[0029] The light intensity sensor generates the light signal intensity according to the ambient light intensity and the light intensity of the light emitting unit.

[0030] Optionally, the power chip further includes an overvoltage detection terminal;

[0031] The main control circuit also includes:

[0032] a sixth resistor, one end of the sixth resistor being coupled to the output end of the rectifier bridge through a seventh resistor, and the other end of the sixth resistor being grounded through an eighth resistor;

[0033] A connection point between the sixth resistor and the eighth resistor is coupled to the overvoltage detection terminal;

[0034] An eighth capacitor is connected in parallel with the eighth resistor.

[0035] Optionally, the power supply circuit further includes an overcurrent detection terminal;

[0036] The main control circuit also includes:

[0037] a ninth resistor, one end of which is coupled to the overcurrent detection terminal, and the other end of which is grounded;

[0038] A tenth resistor is connected in parallel with the ninth resistor.

[0039] A second aspect of the present disclosure provides a lamp, comprising a lamp power supply circuit as described in any one of the above.

[0040] The beneficial effects of the present disclosure are as follows: the feedback chip can monitor the changes in external ambient light in real time through the light detection circuit and receive a specific trigger signal through the sensing input terminal to generate a feedback signal. The power chip dynamically adjusts the output of the power chip according to the feedback signal, thereby adjusting the light intensity of the light-emitting unit, which not only saves energy but also provides the most suitable lighting effect according to environmental requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram showing the circuit principle of a main control circuit in a lamp power circuit in an embodiment of the present disclosure is shown.

[0042] Figure 2A schematic diagram showing the circuit principle of a feedback circuit in a lamp power circuit in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0044] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0045] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0046] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0047] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0048] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0049] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0050] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0051] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0052] In the related art, the brightness adjustment feedback adjustment mechanism of lamps is relatively simple, mainly relying on preset voltage or current thresholds to control the brightness of the light-emitting unit, and lacks the ability to dynamically adapt to changes in the actual lighting environment. This static adjustment method cannot effectively utilize ambient light information, resulting in high energy consumption in an environment with sufficient light, thereby increasing unnecessary energy consumption.

[0053] In view of this, an embodiment of the present disclosure provides a lamp power supply circuit, which can realize dynamic dimming of the lamp.

[0054] The lamp power supply circuit includes a main control circuit and a feedback circuit.

[0055] exist Figure 1In the example, the main control circuit includes: an input circuit and a power chip.

[0056] An input terminal of the input circuit is coupled to an external power source.

[0057] The power chip includes: a power input terminal VIN, a power chip output terminal OUT, a power chip power supply terminal DVCC1 and a feedback input terminal PWM1.

[0058] The output end of the input circuit is coupled to the power input end VIN via a rectifier bridge and a first resistor R1 in sequence.

[0059] The output terminal OUT of the power chip is coupled to the cathode LED- of the light emitting unit, and the anode LED+ of the light emitting unit is coupled to the output terminal of the rectifier bridge.

[0060] exist Figure 2 In the example, the feedback circuit includes: a power supply circuit and a feedback chip.

[0061] The feedback chip includes a feedback chip power supply terminal DVCC2, a sensing input terminal PIR, a light detection input terminal AD and a feedback output terminal PWM2.

[0062] The power chip power supply terminal DVCC1 is coupled to the feedback chip power supply terminal DVCC2 through the power supply circuit, and the power chip power supply terminal DVCC1 is grounded through the first capacitor C1.

[0063] The sensing input terminal PIR is coupled to a sensing chip, the light detection input terminal AD is coupled to a light detection circuit, and the feedback output terminal PWM2 is coupled to the feedback input terminal PWM1.

[0064] The feedback chip generates a feedback signal according to the trigger signal input by the sensing input terminal PIR or the light signal strength input by the light detection input terminal AD. The power chip adjusts the light intensity of the light emitting unit according to the feedback signal.

[0065] Specifically, in some embodiments, the input circuit is used to provide the power input required by the circuit; the power chip converts the power provided by the input circuit into a voltage and current suitable for the operation of the light-emitting unit, and the power chip is used to power the feedback chip.

[0066] Since the rectifier bridge converts the AC power inputted by the input circuit into DC power, the first resistor R1 is used for current limiting and / or voltage adjustment to ensure stable input to the power chip. The light-emitting unit can be LED lamp beads; other light-emitting devices can also be selected according to actual needs.

[0067] The feedback chip takes power from the power chip through the power supply circuit to provide working power for the feedback circuit. The feedback chip includes a first mode and a second mode. When the feedback chip is in the first mode, the feedback chip adjusts the light intensity of the light-emitting unit according to the trigger signal. As an example, the sensing chip can be an infrared human body sensing chip. The sensing chip is based on an internally set photoresistor. When the sensed light intensity is higher than a preset threshold (such as during the day), it does not work, and when the sensed light intensity is lower than the preset threshold (such as at night), it works; when the sensing chip is working, when it detects that someone passes by, a trigger signal is generated, and the feedback chip turns on the light-emitting unit according to the trigger signal, and adjusts the brightness of the light-emitting unit to a first preset value that is a preset percentage of the maximum brightness and the lighting time is, for example, tens of seconds (or set according to actual conditions). When the sensing chip is not working, the light-emitting unit will not work even if someone passes by.

[0068] When the feedback chip is started to the second mode, the light detection circuit starts to work. The light detection circuit detects the light signal intensity (the sum of the ambient light intensity and the light intensity of the light-emitting unit) in real time and feeds back to the feedback chip. The power chip adjusts the light intensity of the light-emitting unit according to the feedback signal to make the light signal intensity a constant value. The size of the constant value can be set according to actual conditions.

[0069] In some embodiments, the power chip model may be MT7653 and related series chips with similar functions, or power chips from other manufacturers with similar principles.

[0070] In some embodiments, the feedback chip model may be FIS5761 and related series chips with similar functions, or feedback chips from other manufacturers with similar principles.

[0071] Optional, in Figure 1 In the example, the input circuit includes: a neutral line input terminal N, a live line input terminal L, and an adjustable resistor RV1.

[0072] The neutral line input terminal N is coupled to external AC power, and is coupled to the input terminal of the rectifier bridge through a fuse F1.

[0073] The live wire input terminal L is coupled to the input terminal of the rectifier bridge.

[0074] The adjustable resistor RV1 is coupled between the live line input terminal L and the neutral line input terminal N, and is coupled to the input terminal of the rectifier bridge.

[0075] Specifically, in some embodiments, the fuse F1 ensures that the power supply can be quickly cut off in the case of abnormal current to prevent circuit damage or fire risk. By adjusting the resistance value of the adjustable resistor RV1, the current flowing into the rectifier bridge can be fine-tuned. Increasing the resistance value will reduce the current passing through the live wire, and vice versa, reducing the resistance value will increase the current, thereby achieving the purpose of adjusting the overall input power of the circuit, thereby affecting the working state and efficiency of the subsequent circuit, which is particularly suitable for scenarios with specific requirements for input current or requiring on-site calibration.

[0076] Optionally, a first energy storage filter capacitor is also provided, the positive electrode of the first energy storage filter capacitor is coupled to the output end of the rectifier bridge, and the negative electrode of the first energy storage filter capacitor is grounded. When working, the first energy storage filter capacitor acts as a filter, and its large capacitance value can absorb the remaining high-frequency clutter in the output of the rectifier bridge, that is, the ripple component, reduce the output ripple, and ensure the purity of the direct current. When the load or the power input terminal VIN (neutral input terminal N and / or live input terminal L) changes, the capacitor can quickly release the stored energy.

[0077] Optional, in Figure 2 In the example, the power supply circuit includes: a conversion chip, a second capacitor C2 and a fourth capacitor C4.

[0078] The conversion chip includes a chip input terminal I, a first chip ground terminal G1, and a chip output terminal O. The chip input terminal I is coupled to the power supply terminal DVCC1 of the power chip through a second resistor R2, the first chip ground terminal G1 is grounded, and the chip output terminal O is coupled to the feedback chip power supply terminal DVCC2 to supply power to the feedback chip.

[0079] One end of the second capacitor C2 is coupled to the chip input terminal I, and the other end of the second capacitor C2 is grounded.

[0080] One end of the fourth capacitor C4 is coupled to the chip output terminal O, and the other end of the fourth capacitor C4 is grounded.

[0081] Specifically, in some embodiments, the conversion chip is used to convert the voltage provided by the power supply terminal DVCC1 of the power chip into an ideal voltage level suitable for the operation of the feedback chip, thereby improving energy utilization and reducing power consumption. A second resistor R2 is provided between the chip input terminal I of the conversion chip and the power supply terminal DVCC1 of the power chip for current limiting protection to prevent damage to the conversion chip caused by excessive transient current. It can also play a certain filtering role and stabilize the input voltage. The second capacitor C2 is a decoupling capacitor, which helps to filter out power ripple, stabilize the voltage input to the conversion chip, ensure a smoother conversion process, and improve the stability and response speed of the overall circuit. The fourth capacitor C4 is an output filter capacitor, which further smoothes the converted voltage, reduces ripple, and ensures that the feedback chip is supplied with a clean and stable power supply.

[0082] exist Figure 2 In the example, a third capacitor C3 and a fifth capacitor C5 are also provided. The third capacitor C3 is connected in parallel with the second capacitor C2, which enhances the filtering capability of the chip input terminal I, helps absorb more high-frequency noise and ripple, and reduces the impact of power supply noise on other parts of the circuit. The fifth capacitor C5 is connected in parallel with the fourth capacitor C4 to perform secondary filtering on the output voltage.

[0083] Optional, in Figure 2 In the example, the sensing chip includes: a chip power supply terminal D, a chip feedback terminal S and a second chip ground terminal G2, the chip power supply terminal D is coupled to the output terminal of the power supply circuit and is grounded through a sixth capacitor C6; the chip feedback terminal S is coupled to the sensing input terminal PIR through a third resistor R3.

[0084] Specifically, in the above embodiment, the chip power supply terminal D provides the working power to the sensing chip through the power supply circuit; the sixth capacitor C6 is used to filter power supply noise and protect the sensing chip from unnecessary voltage fluctuations. The third resistor R3 is used for current limiting and protection.

[0085] As an example, when the sensing chip is working, when there is human movement within the detection range of the sensing chip, the sensing chip can quickly capture the slight changes caused by human movement, such as changes in reflected waves or pyroelectric effects, by using its internal integrated microwave radar, infrared or ultrasonic sensing technology. Once human activity is sensed, the chip feedback terminal S of the sensing chip responds and sends a trigger signal to the sensing input terminal PIR of the feedback chip through the third resistor R3, which represents the information of human presence or movement, and is the key basis for controlling the brightness adjustment or switch state of the lamp. As an example, the sensing chip has a memory function and can memorize the light intensity of the last light-emitting unit. When receiving the trigger signal, the power chip controls the light intensity of the light-emitting unit to be the last light intensity.

[0086] Optional, in Figure 2 In the example, a ninth capacitor C9 is further arranged between the chip ground terminal and the chip power supply terminal D for filtering.

[0087] In some embodiments, the model of the sensing chip may be AS312 and its related series chips with similar functions, or sensing chips from other manufacturers with similar principles.

[0088] Optional, in Figure 2 In the example, the feedback chip further includes an operation terminal TP coupled to an operation unit through a fourth resistor R4. The feedback chip generates an adjustment signal according to an operation signal fed back by the operation unit, and adjusts the light intensity of the light emitting unit according to the adjustment signal through the power chip.

[0089] Specifically, in some embodiments, the feedback chip can be switched between the first mode and the second mode through the operating unit. As an example, the operating unit can be a physical switch, a touch panel, a remote control, or any other form of human-machine interface device, allowing the user to manually select the light intensity level of the light-emitting unit according to personal preference or actual needs, and the light intensity of the light-emitting unit can be set to at least one level according to actual use requirements. When the feedback chip is in the first mode, when the sensing chip works normally and detects that someone is passing by, the power chip sets the light-emitting unit to the light intensity level memorized last time, or the initial level, according to the feedback signal, and the user can adjust the light intensity level of the light-emitting unit through the operating unit according to their own needs.

[0090] The operating unit can also switch the feedback chip to the second mode by adjusting to another gear. When the feedback chip is in the second mode, the light-emitting unit works according to the second mode working method described above, which will not be described in detail here.

[0091] Optional, in Figure 2 In the example, the feedback chip further includes a sensitivity adjustment terminal, which is grounded via a seventh capacitor C7, and the sensitivity adjustment terminal is used to adjust the sensitivity of the operating unit.

[0092] Specifically, in the above embodiment, the sensitivity adjustment end changes the sensitivity of the operating unit to the input signal through external adjustment, thereby achieving a wider range of applicable scenarios and a more personalized user experience. The seventh capacitor C7 is used for filtering.

[0093] Optional, in Figure 2 In the example, the feedback chip further includes: a light detection power supply terminal VDD, and the light detection power supply terminal VDD is coupled to the light detection circuit.

[0094] The light detection circuit includes: a light intensity sensor D1, an input end of the light intensity sensor D1 is coupled to the light detection power supply end VDD, and an output end of the light intensity sensor D1 is coupled to the light detection input end AD and / or is grounded through a fifth resistor R5.

[0095] The light intensity sensor D1 generates the light signal intensity according to the ambient light intensity and the light intensity of the light emitting unit.

[0096] Specifically, in the above embodiment, the light detection power supply terminal VDD supplies power to the light detection circuit. In the light detection circuit, the light intensity sensor D1 detects the light signal intensity (the light intensity sensor D1 generates an electrical signal of the total light intensity, i.e., a light intensity signal, based on the sum of the ambient light (natural light or indoor lighting) and the light intensity emitted by the built-in light-emitting unit (assuming it is an LED) of the feedback chip). The fifth resistor R5 is used to eliminate noise interference.

[0097] As an example, the light intensity sensor D1 can be a photodiode, and the light intensity is obtained by the current size being proportional to the intensity of the incident light. Alternatively, the light intensity sensor D1 can also be implemented as a photoresistor instead, which has a simple structure and low cost, and is suitable for low-cost and low-precision applications; the resistance value of the photoresistor decreases as the light intensity increases.

[0098] The selection of the light intensity sensor D1 can be made according to actual use requirements and use environment.

[0099] Optionally, the power chip further includes an overvoltage detection terminal RD.

[0100] exist Figure 1 In the example, the main control circuit further includes:

[0101] A sixth resistor R6, one end of the sixth resistor R6 is coupled to the output end of the rectifier bridge through a seventh resistor R7, and the other end of the sixth resistor R6 is grounded through an eighth resistor R8.

[0102] A connection point between the sixth resistor R6 and the eighth resistor R8 is coupled to the overvoltage detection terminal RD.

[0103] The eighth capacitor C8 is connected in parallel with the eighth resistor R8.

[0104] Specifically, in the above embodiment, the overvoltage detection terminal RD is used to detect whether the voltage exceeds the safe operating range to prevent excessive voltage from damaging the system or load (light-emitting unit). Among them, one end of the sixth resistor R6 is connected to the output end of the rectifier bridge through the seventh resistor R7, which is used for voltage sampling on the input side, and the other end is grounded through the eighth resistor R8 to form a voltage divider circuit. The overvoltage detection terminal RD obtains the sampling voltage through the connection point between the sixth resistor R6 and the eighth resistor R8; the eighth capacitor C8 is connected in parallel to the eighth resistor R8 to form an RC filter network, which has high impedance to high-frequency noise signals and low impedance to low-frequency signals, effectively suppressing transient voltage spikes and stabilizing the overvoltage detection signal.

[0105] When the voltage output by the rectifier bridge rises above the preset limit for any reason, the voltage at the voltage dividing point between the sixth resistor R6 and the eighth resistor R8 rises through the voltage division of the seventh resistor R7, and the overvoltage signal is transmitted to the overvoltage detection terminal RD of the power chip. After receiving the overvoltage signal, the power chip starts the built-in protection mechanism, such as reducing the output voltage, disconnecting / turning off or activating a warning, to avoid damage to the load (light-emitting unit) or system.

[0106] Optionally, the power supply circuit also includes an overcurrent detection terminal CS.

[0107] exist Figure 1 In the example, the main control circuit further includes:

[0108] A ninth resistor R9, one end of the ninth resistor R9 is coupled to the over-current detection terminal CS, and the other end of the ninth resistor R9 is grounded.

[0109] The tenth resistor R10 is connected in parallel with the ninth resistor R9.

[0110] Specifically, in the above embodiment, the overcurrent detection terminal CS is used to detect the current on the input side to ensure that the current does not exceed a predetermined threshold, prevent overload, and protect circuit components from damage. The ninth resistor R9 is used to sample the current overcurrent signal. The tenth resistor R10 is connected in parallel with the ninth resistor R9 to form a voltage divider circuit.

[0111] When the current in the circuit is too large, a corresponding voltage drop is generated on the ninth resistor R9 through the feedback of the overcurrent detection terminal CS. The proportional relationship formed by the voltage drop and the tenth resistor R10 accurately reflects the overcurrent situation. After the signal is processed, a protection mechanism can be triggered, such as reducing the output current, disconnecting / shutting down or alarming, to effectively prevent overcurrent hazards.

[0112] A lamp is provided in yet another embodiment of the present disclosure, comprising any one of the lamp power supply circuits described above.

[0113] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A lamp power supply circuit, characterized in that: Applied to lamps; Including main control circuit and feedback circuit; The main control circuit comprises: An input circuit, an input terminal of the input circuit being coupled to an external power source; A power chip, comprising: a power input terminal, a power chip output terminal, a power chip power supply terminal and a feedback input terminal; The output end of the input circuit is coupled to the power input end via a rectifier bridge and a first resistor in sequence; The output end of the power chip is coupled to the cathode of the light emitting unit, and the anode of the light emitting unit is coupled to the output end of the rectifier bridge; The feedback circuit comprises: A feedback chip, the feedback chip comprising a feedback chip power supply terminal, a sensing input terminal, a light detection input terminal and a feedback output terminal; The power supply end of the power chip is coupled to the power supply end of the feedback chip through a power supply circuit, and the power supply end of the power chip is grounded through a first capacitor; The sensing input terminal is coupled to the sensing chip; the light detection input terminal is coupled to the light detection circuit; the feedback output terminal is coupled to the feedback input terminal; The feedback chip generates a feedback signal according to the trigger signal input from the sensing input terminal or the intensity of the light signal input from the light detection input terminal; and the power chip adjusts the light intensity of the light emitting unit according to the feedback signal.

2. The lamp power supply circuit according to claim 1, characterized in that: The input circuit comprises: A neutral line input terminal, the neutral line input terminal is coupled to external alternating current, and is coupled to the input terminal of the rectifier bridge through a fuse; A live wire input terminal, the live wire input terminal being coupled to an input terminal of the rectifier bridge; An adjustable resistor is coupled between the live line input terminal and the neutral line input terminal, and is coupled to the input terminal of the rectifier bridge.

3. The lamp power supply circuit according to claim 1, characterized in that: The power supply circuit comprises: A conversion chip, the conversion chip comprising a chip input terminal, a first chip ground terminal and a chip output terminal; the chip input terminal is coupled to the power supply terminal of the power chip through a second resistor, the first chip ground terminal is grounded, and the chip output terminal is coupled to the feedback chip power supply terminal to supply power to the feedback chip; A second capacitor, one end of the second capacitor is coupled to the chip input terminal, and the other end of the second capacitor is grounded; A fourth capacitor, one end of which is coupled to the chip output end, and the other end of which is grounded.

4. The lamp power supply circuit according to claim 1, characterized in that: The sensing chip includes: a chip power supply terminal, a chip feedback terminal and a second chip ground terminal. The chip power supply terminal is coupled to the output terminal of the power supply circuit and is grounded through a sixth capacitor; the chip feedback terminal is coupled to the sensing input terminal through a third resistor.

5. The lamp power supply circuit according to claim 1, characterized in that: The feedback chip also includes an operating end, which is coupled to an operating unit through a fourth resistor; the feedback chip generates an adjustment signal according to an operation signal fed back by the operating unit, and adjusts the light intensity of the light-emitting unit according to the adjustment signal through the power chip.

6. The lamp power supply circuit according to claim 5, characterized in that: The feedback chip further includes a sensitivity adjustment terminal connected to ground via a seventh capacitor, and the sensitivity adjustment terminal is used to adjust the sensitivity of the operating unit.

7. The lamp power supply circuit according to claim 1, characterized in that: The feedback chip further includes: a light detection power supply terminal, the light detection power supply terminal being coupled to the light detection circuit; The light detection circuit comprises: a light intensity sensor, an input end of the light intensity sensor is coupled to the light detection power supply end, an output end of the light intensity sensor is coupled to the light detection input end and / or is grounded through a fifth resistor; The light intensity sensor generates the light signal intensity according to the ambient light intensity and the light intensity of the light emitting unit.

8. The lamp power supply circuit according to claim 1, characterized in that: The power chip also includes an overvoltage detection terminal; The main control circuit also includes: a sixth resistor, one end of the sixth resistor being coupled to the output end of the rectifier bridge through a seventh resistor, and the other end of the sixth resistor being grounded through an eighth resistor; A connection point between the sixth resistor and the eighth resistor is coupled to the overvoltage detection terminal; An eighth capacitor is connected in parallel with the eighth resistor.

9. The lamp power supply circuit according to claim 1, characterized in that: The power supply circuit also includes an overcurrent detection terminal; The main control circuit also includes: a ninth resistor, one end of which is coupled to the overcurrent detection terminal, and the other end of which is grounded; A tenth resistor is connected in parallel with the ninth resistor.

10. A lamp, characterized in that: The invention comprises a lamp power supply circuit as described in any one of claims 1 to 9.

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