Simple high-voltage constant-current constant-power intelligent light induction lamp circuit

Abstract

The utility model discloses a simple high-voltage constant-current constant-power intelligent photoinduction lamp circuit, and relates to the technical field of LED lamps. 220V alternating current is connected with the rectifying circuit through the input protection circuit, the output end of the rectifying circuit is connected with the filter circuit, one path of voltage output by the rectifying circuit is connected with the light sensation circuit and the voltage division circuit through the current-limiting step-down circuit and the voltage stabilizing circuit, and the light sensation circuit and the voltage division circuit are connected with the conduction amplitude control circuit. The other path is connected to the conduction amplitude control circuit through the current limiting circuit and the LED lamp bead string circuit, the conduction amplitude control circuit is connected with the linear constant power module, and the linear constant power module is connected with the output current adjusting circuit and the constant power circuit. The high-voltage DC / DC converter is simple and convenient to debug, not easy to damage, integrated, short in response time between circuits, high in conversion efficiency, strong in element replaceability, low in cost, high in reliability and wide in application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lamps, and particularly relates to a simple high-voltage constant-current and constant-power intelligent light-sensing lamp circuit. Background Technique

[0002] As a new type of lighting fixture, LED lamps have the advantages of energy saving, long life, earthquake resistance, rich colors, small size, high luminous flux utilization rate, high luminous efficiency, easy installation design, safety and reliability compared with traditional lamps. With the increasing popularity of LED lamps, there are more and more requirements for various application scenarios. Therefore, in order to save production costs and application costs more, there are various ways to intelligently control the operation of LEDs on the market. Among them, the driving circuit that uses a power supply to control LED light induction is a commonly used solution, but this solution has the following disadvantages:

[0003] (1) The power supply has a large volume and cannot be integrated: Since the switching power supply requires a large number of safety components to suppress electromagnetic interference and a large transformer to achieve the step-down function, the volume of the product made will be relatively large, and it is impossible to integrate the power supply and the lamp into one.

[0004] (2) The circuit structure components are complex: The light-sensitive resistor needs to be externally connected to accurately perform environmental induction control, and output wires need to be connected from the power supply to the lamp end, and the input mains power needs to be connected to the power supply again, so the circuit connection is complex.

[0005] (3) The product components are easily damaged: Since a large amount of spike voltage and current will be generated when the switching power supply is working, this voltage can be as small as a hundred volts or as large as thousands of volts. This spike voltage is extremely easy to damage the main control circuit in the circuit, resulting in electrical failure.

[0006] (4) The conversion efficiency is reduced: Since spikes will be generated when using a switching power supply, a series of components need to be added to absorb this spike, and this absorption power supply will reduce the power supply efficiency.

[0007] (5) It is not convenient to replace: When a power supply dimming and light-sensing power supply fails, it is necessary to replace three parts: the power supply, the lamp, and the induction head, which causes certain difficulties in replacement.

[0008] (6) The standby power consumption is large and the noise is relatively high: Because a switching power supply is used, certain noise and power consumption will be generated when the power supply is working.

[0009] (7) The response time between circuits is long: As the length of the circuit between components increases, the line transmission time and the component response time will also increase.

[0010] (8) High cost: Since the existing circuit structure is a switching power supply structure, a large amount of electromagnetic interference will be generated in the power grid when the power supply is switched. To filter out the electromagnetic interference generated during switching, a large number of safety components need to be added to suppress this interference during switching, increasing the product cost.

[0011] To solve the above problems, it is particularly necessary to design a new type of simple high-voltage constant-current and constant-power intelligent light induction lamp circuit. Utility Model Content

[0012] Aiming at the deficiencies in the existing technology, the purpose of the present utility model is to provide a simple high-voltage constant-current and constant-power intelligent light induction lamp circuit, which has a simple structure, reasonable design, easy debugging, integrated integration, high conversion efficiency, strong replaceability, low cost, strong practicability, and is easy to promote and use.

[0013] To achieve the above purpose, the present utility model is realized through the following technical solutions: A simple high-voltage constant-current and constant-power intelligent light induction lamp circuit includes an input protection circuit, a rectification circuit, a linear constant-power module, an output current adjustment circuit, a constant-power circuit, a filtering circuit, a current-limiting and step-down circuit, a voltage stabilization circuit, a light sensing circuit, a voltage division circuit, a current-limiting circuit, a conduction amplitude control circuit, and an LED lamp string circuit. The 220V alternating current is connected to the rectification circuit through the input protection circuit. The output end of the rectification circuit is connected to the filtering circuit. One path of the voltage output by the rectification circuit is connected to the light sensing circuit and the voltage division circuit through the current-limiting and step-down circuit and the voltage stabilization circuit. The light sensing circuit and the voltage division circuit are connected to the conduction amplitude control circuit. The other path is connected to the conduction amplitude control circuit through the current-limiting circuit and the LED lamp string circuit. The conduction amplitude control circuit is connected to the linear constant-power module, and the linear constant-power module is respectively connected to the output current adjustment circuit and the constant-power circuit.

[0014] Preferably, the input protection circuit includes a fuse tube, and the rectification circuit includes a rectifier bridge and a first capacitor. The 220V alternating current is connected to the AC input end of the rectifier bridge through the fuse tube, and the first capacitor is connected in parallel at both ends of the DC output end of the rectifier bridge.

[0015] Preferably, the output current adjustment circuit includes a first resistor, and the constant-power circuit includes a second resistor and a second capacitor. Both ends of the first resistor are respectively connected to the GND terminal and the CS terminal of the linear constant-power module. Both ends of the second resistor are respectively connected to the VT terminal and the OUT terminal of the linear constant-power module. A second capacitor for feedback compensation is connected to the linear constant-power module. The GND terminal of the linear constant-power module is connected to the DC output negative pin of the rectifier bridge, and the OUT terminal of the linear constant-power module is grounded.

[0016] Preferably, the filtering circuit includes a third capacitor. One end of the third capacitor is connected to the positive DC output pin of the rectifier bridge, and the other end of the third capacitor is grounded.

[0017] Preferably, the current-limiting and step-down circuit includes a third resistor. The voltage-regulating circuit includes a fourth resistor, a voltage-regulating diode, and a fourth capacitor. The light-sensing circuit includes a light-dependent resistor. The voltage-dividing circuit includes a fifth resistor and a sixth resistor. One end of the third resistor is connected to the positive DC output pin of the rectifier bridge, and the other end of the third resistor is connected to a parallel circuit of the fourth resistor, the voltage-regulating diode, and the fourth capacitor to the ground terminal. The other end of the third resistor is also connected to one end of the light-dependent resistor, and the other end of the light-dependent resistor is connected to the conduction amplitude control circuit through the fifth resistor and the sixth resistor respectively.

[0018] Preferably, the conduction amplitude control circuit includes a first triode and a second triode. The current-limiting circuit includes a seventh resistor. One end of the seventh resistor is connected to the positive DC output pin of the rectifier bridge, and the other end of the seventh resistor is connected to the collector of the first triode. The base and emitter of the first triode are connected to the sixth resistor and the fifth resistor respectively to the other end of the light-dependent resistor. The emitters of the first triode and the second triode are both grounded. The collector of the first triode is connected to the base of the second triode, and the collector of the second triode is connected to the LED lamp string circuit.

[0019] Preferably, the LED lamp string circuit includes a first LED lamp bead to an nth LED lamp bead. The positive end of the circuit formed by the series connection of the above lamp beads in sequence is connected to the positive DC output pin of the rectifier bridge, and the negative end is connected to the collector of the second triode.

[0020] The beneficial effects of the present invention are as follows: The circuit design is reasonable, the debugging is simple, it is not easy to be damaged, it is integrated, the response time between circuits is short, the conversion efficiency is high, the component replaceability is strong, the cost is low, the reliability is high, and the application prospect is broad. Description of the Drawings

[0021] The present invention will be described in detail below with reference to the drawings and specific embodiments;

[0022] Figure 1 is the structural block diagram of the present invention;

[0023] Figure 2 is the circuit diagram of the present invention. Specific Embodiments

[0024] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0025] Refer toFigure 1-2 , this specific embodiment adopts the following technical solution: A simple high-voltage constant-current and constant-power intelligent light-sensing lamp circuit, including an input protection circuit 1, a rectifier circuit 2, a linear constant-power module U1, an output current regulation circuit 3, a constant-power circuit 4, a filter circuit 5, a current-limiting and voltage-dropping circuit 6, a voltage regulation circuit 7, a light-sensing circuit 8, a voltage-dividing circuit 9, a current-limiting circuit 10, a conduction amplitude control circuit 11, and an LED lamp string circuit 12. The 220V alternating current is connected to the rectifier circuit 2 through the input protection circuit 1. The output end of the rectifier circuit 2 is connected to the filter circuit 5. One path of the voltage output by the rectifier circuit 2 is connected to the light-sensing circuit 8 and the voltage-dividing circuit 9 through the current-limiting and voltage-dropping circuit 6 and the voltage regulation circuit 7. The light-sensing circuit 8 and the voltage-dividing circuit 9 are connected to the conduction amplitude control circuit 11. The other path is connected to the conduction amplitude control circuit 11 through the current-limiting circuit 10 and the LED lamp string circuit 12. The conduction amplitude control circuit 11 is connected to the linear constant-power module U1. The linear constant-power module U1 is respectively connected to the output current regulation circuit 3 and the constant-power circuit 4. Specifically, the structures and connection relationships of each circuit are as follows:

[0026] The input protection circuit 1 includes a fuse F1. The fuse F1 is used to automatically disconnect when a fault occurs in the entire circuit to protect the safety of the entire circuit. The rectifier circuit 2 includes a rectifier bridge BD1 and a first capacitor C1. The 220V alternating current is connected to the AC input terminal of the rectifier bridge BD1 through the fuse F1. The first capacitor C1 is connected in parallel at both ends of the DC output terminal of the rectifier bridge BD1. The rectifier bridge BD1 is used to rectify the AC alternating current into pulsating direct current. The first capacitor C1 is used as a filter capacitor to filter out high-frequency noise in the circuit, making the product non-flickering.

[0027] The output current regulation circuit 3 includes a first resistor RS. The constant-power circuit 4 includes a second resistor RT and a second capacitor C2. Both ends of the first resistor RS are respectively connected to the GND terminal and the CS terminal of the linear constant-power module U1. Both ends of the second resistor RT are respectively connected to the VT terminal and the OUT terminal of the linear constant-power module U1. A second capacitor C2 for feedback compensation is connected to the linear constant-power module U1. The GND terminal of the linear constant-power module U1 is connected to the DC output negative pin of the rectifier bridge BD1. The OUT terminal of the linear constant-power module U1 is grounded. The first resistor RS serves as a constant-current reference resistor. Adjusting the size of the first resistor RS can adjust the output current of the entire circuit. The second resistor RT serves as a constant-power reference resistor. Adjusting the size of the second resistor RT can adjust the constant-power accuracy. The second capacitor C2 compensates the signal fed back by the second resistor RT to obtain accurate constant power.

[0028] The filtering circuit 5 includes a third capacitor C3. One end of the third capacitor C3 is connected to the DC output positive pin of the rectifier bridge BD1, and the other end of the third capacitor C3 is grounded. The third capacitor C3 is used to filter out the AC ripple in the circuit.

[0029] The current-limiting and step-down circuit 6 includes a third resistor R1. The voltage-regulating circuit 7 includes a fourth resistor RW, a zener diode W1, and a fourth capacitor C4. The light-sensing circuit 8 includes a light-dependent resistor RL1. The voltage-dividing circuit 9 includes a fifth resistor R2 and a sixth resistor R3. The conduction amplitude control circuit 11 includes a first triode Q1 and a second triode Q2. The current-limiting circuit 10 includes a seventh resistor R4. One end of the third resistor R1 is connected to the DC output positive pin of the rectifier bridge BD1. The other end of the third resistor R1 is connected to the parallel circuit of the fourth resistor RW, the zener diode W1, and the fourth capacitor C4 to the ground terminal. The other end of the third resistor R1 is also connected to one end of the light-dependent resistor RL1. The other end of the light-dependent resistor RL1 is respectively connected to one end of the fifth resistor R2 and one end of the sixth resistor R3. The other ends of the fifth resistor R2 and the sixth resistor R3 are respectively connected to the emitter and the base of the first triode Q1. The collector of the first triode Q1 is connected to one end of the seventh resistor R4. The other end of the seventh resistor R4 is connected to the DC output positive pin of the rectifier bridge BD1. The emitters of the first triode Q1 and the second triode Q2 are both grounded. The collector of the first triode Q1 is connected to the base of the second triode Q2. The collector of the second triode Q2 is connected to the LED lamp string circuit 12.

[0030] The direct current of the rectifier bridge BD1 is stepped down and current-limited by the third resistor R1, and after being supplied to the fourth resistor RW for voltage division and the zener diode W1 for voltage regulation, it provides a stable voltage for the light-dependent resistor RL1. The fourth capacitor C4 is used as a decoupling and filtering capacitor, which can suppress the noise generated due to load changes. The fifth resistor R2 is used to stabilize the base potential of the first triode Q1. The sixth resistor R3 is a current-limiting resistor for the base power supply, which provides current for the first triode Q1. The light-dependent resistor RL1 senses the ambient brightness, adjusts the voltage of the fifth resistor R2, and after stepping down and current-limiting through the sixth resistor R3, provides the base voltage of the first triode Q1, thereby controlling the turn-off of the first triode Q1. After sensing the environment, it passes through the first triode Q1, thereby controlling the turn-off of the second triode Q2. The seventh resistor R4 is used as the collector biasing resistor of the first triode Q1, which provides the collector potential for the first triode Q1 and also provides current and potential for the base of the second triode Q2. The above circuit adjusts the voltage division between the light-dependent resistor RL1 and the fifth resistor R2 through the light sensing of the light-dependent resistor RL1, adjusts the base voltage of the first triode Q1, controls the turn-on and turn-off of the first triode Q1, and further controls the conduction amplitude of the second triode Q2, thereby changing the brightness atmosphere of the light strip with the change of ambient light.

[0031] The LED lamp bead string circuit 12 includes the first LED lamp bead L1 to the nth LED lamp bead Ln. The first LED lamp bead L1 to the nth LED lamp bead Ln are light-emitting diodes, and the series connection quantity can be changed according to design requirements. The positive electrode of the circuit formed by the above lamp beads connected in series in sequence is connected to the positive electrode pin of the DC output of the rectifier bridge BD1, and the negative electrode is connected to the collector of the second triode Q2.

[0032] The working principle of this specific embodiment is as follows: When AC-L / AC-N are respectively connected to the commercial power AC220V or other AC voltages, the rectifier bridge BD1 supplies pulsating direct current after being rectified by the fuse F1. After the high-frequency ripple is filtered by the first capacitor C1, stable direct current is output. This direct current is divided into two paths. One path passes through the third resistor R1 for voltage reduction and current limiting, the fourth resistor RW for voltage division, the zener diode W1 for voltage stabilization, and the fourth capacitor C4 for filtering, and then supplies voltage and current to the photosensitive resistor RL1, provides the base potential for the fifth resistor R2, and after passing through the sixth resistor R3 for voltage division and current limiting, provides a base voltage for the first triode Q1; at the same time, while the seventh resistor R4 provides the collector current for the first triode Q1, it also provides the base voltage and current for the second triode Q2. The emitter of the first triode Q1 is connected to the OUT pin of the linear constant power module U1; the other path of the direct current passes through the series connection of the first LED lamp bead L1 to the nth LED lamp bead Ln, and then provides the collector voltage for the second triode Q2. The emitter of the second triode Q2 is connected to the OUT pin. The OUT pin is sampled through the second resistor RT and compared by the comparator of the linear constant power module, so as to adjust the power. At the same time, the CS pin samples to return a constant current to the negative electrode of the rectifier bridge. The photosensitive resistor RL1 senses the ambient brightness, and there are the following two working modes:

[0033] (1) When the surrounding environment is relatively dark: The resistance value of the photosensitive resistor RL1 continuously increases as the light intensity gradually becomes darker. The current passing through the photosensitive resistor RL1 decreases, the node voltage and current of the sixth resistor R3 continuously decrease, the base voltage and current of the first triode Q1 continuously decrease, the conduction amplitude of the first triode Q1 becomes smaller and smaller, and the base voltage and current obtained by the second triode Q2 become larger and larger. Then the voltage and current provided by the seventh resistor R4 will become larger and larger. At this time, the base voltage and current of the second triode Q2 will become larger and larger, the conduction amplitude of the second triode Q2 becomes larger and larger, and it is in the linear amplification state. The LED lamp belt composed of the first LED lamp bead L1 to the nth LED lamp bead Ln is gradually lit. When the first triode Q1 is completely turned off, at this time the second triode Q2 is completely turned on, and the LED lamp belt is the brightest.

[0034] (2) When the surrounding environment is brighter: The resistance value of the photosensitive resistor RL1 continuously decreases as the light intensity gradually increases. The current passing through the photosensitive resistor RL1 increases, and the node voltage of the sixth resistor R3 continuously rises. The base voltage of the first triode Q1 continuously increases. When the base voltage of the first triode Q1 reaches its turn-on voltage, the first triode Q1 is in the conducting and amplifying state. As the potential of the first triode Q1 becomes higher and higher, the conduction amplification degree of the first triode Q1 becomes larger and larger. The amplitude of the inverted voltage obtained by the base of the second triode Q2 becomes smaller and smaller, so the conduction degree of the second triode Q2 becomes smaller and smaller. At this time, the LED strip becomes darker and darker. When the first triode Q1 is fully conducting, the second triode Q2 obtains the maximum inverted voltage, and at this time, the second triode Q2 is in the off and cut-off state, and the LED strip is turned off.

[0035] The circuit of this specific embodiment is simple. Multiple LED circuits can be set up and a multi-stage photosensitive triode control circuit can be added to separately control the brightness and darkness of each LED. The circuit debugging is convenient. The material of the LED strip circuit board, the number of LED lamp beads, the shape and size, the power supply voltage, etc. in the circuit can all be designed differently according to actual needs, which is flexible and changeable. Its technical advantages are as follows:

[0036] ① Simple circuit: Use a simple constant-current and constant-power photosensitive resistor, a two-way triode circuit, and the photosensitive resistance value of the photosensitive resistor to determine the conduction and cut-off of the first triode, and then adjust the conduction and cut-off of the second triode and the magnitude of the conduction current, so as to adjust the brightness of the LED strip. The circuit uses all general components, and the PCB board design and wiring are simple.

[0037] ② Strong replaceability of electronic components: All the circuits in this design use general electronic components on the market. As long as the parameters and performance are the same, they can be used interchangeably, and the selection is more diverse.

[0038] ③ Integrated integration: Because there are few circuit components and the height is low, all components are integrated on the lamp light source board, which is convenient for installation and no longer requires a separate power supply to be installed separately.

[0039] ④ Constant power and constant current of the lamp power supply: The linear constant-power module controls the current of the entire lamp and performs linear compensation on the VT pin, so that the input linear regulation rate can always maintain high precision and does not change with the change of the input voltage, and the input voltage can be very wide.

[0040] ⑤ High product conversion efficiency. Using a photosensitive resistor to control the current, there is no need to connect a current-limiting resistor in series in the lamp, thereby improving the conversion efficiency of the entire product.

[0041] ⑥ High degree of intelligence. Through photosensitive resistor control, it can be used in some occasions with light requirements for intelligent light control.

[0042] ⑦ It has a high degree of brightness matching with the ambient light. The light strip can be dimmed naturally, and each group of light strips can be independently photosensitive without any flickering during the process, filling the market gap of photosensitive dimming for light strips.

[0043] ⑧ It is easy to pass the certification. The circuit uses linear constant power and the reference voltage of the triode to switch, eliminating the problem of switching frequency. There is no interference generated when the triode conducts and turns off, and no conducted interference and radiation interference will be produced. No additional safety components are required, saving costs.

[0044] ⑨ It is easier to debug. There is no need for a specific power switch and dimmer to turn on / off the lamp and adjust the brightness, eliminating the trouble of manually turning on / off the power supply and the debugging procedure, and shortening the development cycle of the entire product.

[0045] ⑩ It has low power consumption. The light becomes dimmer as the ambient light gets brighter, thus achieving the purpose of energy conservation without any waste, making the product more competitive. This circuit is applicable to some occasions such as ceiling lights, downlights, strip lights, panel lights, etc. that need to be lit for a long time but also require energy conservation, meeting the market and customer demands, and having broad market application prospects.

[0046] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit, characterized in that: The invention comprises an input protection circuit (1), a rectifier circuit (2), a linear constant power module (U1), an output current regulation circuit (3), a constant power circuit (4), a filter circuit (5), a current limiting and voltage reducing circuit (6), a voltage stabilizing circuit (7), a light sensing circuit (8), a voltage dividing circuit (9), a current limiting circuit (10), a conduction amplitude control circuit (11) and an LED lamp bead string circuit (12). 220V AC power is connected to the rectifier circuit (2) via the input protection circuit (1), the output end of the rectifier circuit (2) is connected to the filter circuit (5), and the rectifier circuit (11) is connected to the output end of the rectifier circuit (2). The voltage outputted by the circuit (2) is connected to a light sensing circuit (8) and a voltage dividing circuit (9) via a current limiting and voltage reducing circuit (6) and a voltage stabilizing circuit (7), and the light sensing circuit (8) and the voltage dividing circuit (9) are connected to a conduction amplitude control circuit (11), and the other circuit is connected to a conduction amplitude control circuit (11) via a current limiting circuit (10) and an LED lamp bead string circuit (12), and the conduction amplitude control circuit (11) is connected to a linear constant power module (U1), and the linear constant power module (U1) is respectively connected to an output current regulating circuit (3) and a constant power circuit (4).

2. According to claim 1, a simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit is characterized in that: The input protection circuit (1) comprises a fuse (F1), and the rectifier circuit (2) comprises a rectifier bridge (BD1) and a first capacitor (C1). 220V AC power is connected to the AC input end of the rectifier bridge (BD1) via the fuse (F1), and both ends of the DC output end of the rectifier bridge (BD1) are connected in parallel to the first capacitor (C1).

3. According to claim 1, a simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit is characterized in that: The output current regulating circuit (3) comprises a first resistor (RS), and the constant power circuit (4) comprises a second resistor (RT) and a second capacitor (C2), the two ends of the first resistor (RS) are respectively connected to the GND terminal and the CS terminal of the linear constant power module (U1), the two ends of the second resistor (RT) are respectively connected to the VT terminal and the OUT terminal of the linear constant power module (U1), the linear constant power module (U1) is connected to the second capacitor (C2) for feedback compensation, the GND terminal of the linear constant power module (U1) is connected to the DC output negative electrode pin of the rectifier bridge (BD1), and the OUT terminal of the linear constant power module (U1) is grounded.

4. According to claim 1, a simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit is characterized in that: The filter circuit (5) comprises a third capacitor (C3), one end of the third capacitor (C3) is connected to the DC output positive pin of the rectifier bridge (BD1), and the other end of the third capacitor (C3) is grounded.

5. According to claim 1, a simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit is characterized in that: The current limiting and voltage reducing circuit (6) comprises a third resistor (R1), the voltage stabilizing circuit (7) comprises a fourth resistor (RW), a voltage stabilizing diode (W1) and a fourth capacitor (C4), the light sensing circuit (8) comprises a photosensitive resistor (RL1), the voltage dividing circuit (9) comprises a fifth resistor (R2) and a sixth resistor (R3), one end of the third resistor (R1) is connected to the DC output positive pin of the rectifier bridge (BD1), the other end of the third resistor (R1) is connected to the parallel circuit of the fourth resistor (RW), the voltage stabilizing diode (W1) and the fourth capacitor (C4) to the ground, the other end of the third resistor (R1) is also connected to one end of the photosensitive resistor (RL1), and the other end of the photosensitive resistor (RL1) is connected to the conduction amplitude control circuit (11) through the fifth resistor (R2) and the sixth resistor (R3) respectively.

6. The simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit according to claim 1, characterized in that: The current limiting circuit (10) comprises a seventh resistor (R4), one end of the seventh resistor (R4) is connected to the DC output positive pin of the rectifier bridge (BD1), and the other end of the seventh resistor (R4) is connected to the conduction amplitude control circuit (11).

7. The simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit according to claim 1 is characterized in that: The conduction amplitude control circuit (11) comprises a first triode (Q1) and a second triode (Q2); the base and emitter of the first triode (Q1) are respectively connected to the sixth resistor (R3) and the fifth resistor (R2) to the other end of the photosensitive resistor (RL1); the emitters of the first triode (Q1) and the second triode (Q2) are both grounded; the collector of the first triode (Q1) is connected to the other end of the seventh resistor (R4); the collector of the first triode (Q1) is connected to the base of the second triode (Q2); and the collector of the second triode (Q2) is connected to the LED lamp bead string circuit (12).

8. The simple high-voltage constant-current constant-power intelligent light-sensing lamp circuit according to claim 1, characterized in that: The LED lamp bead string circuit (12) comprises a first LED lamp bead (L1) to an nth LED lamp bead (Ln), wherein the positive terminal of the circuit formed by sequentially connecting the above-mentioned lamp beads in series is connected to the DC output positive electrode pin of the rectifier bridge (BD1), and the negative terminal is connected to the collector of the second transistor (Q2).

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