CN210579334U

CN210579334U - LED luminous flux and color temperature regulating circuit and down lamp with same

Info

Publication number: CN210579334U
Application number: CN201921174145.8U
Authority: CN
Inventors: 王芳; 章杰
Original assignee: Ningbo Dongxing Electric Co ltd
Current assignee: Ningbo Dongxing Electric Co ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-05-19
Anticipated expiration: 2029-07-24

Abstract

The utility model relates to a LED luminous flux and colour temperature regulating circuit, including supply circuit, colour temperature regulating circuit and luminous flux regulating circuit, luminous flux regulating circuit and colour temperature regulating circuit all are connected with supply circuit, including second switching element, its characterized in that among the colour temperature regulating circuit: the LED dimming circuit is characterized by further comprising a dimming circuit and a PWM conversion circuit, wherein the PWM conversion circuit is connected with the power supply circuit, a light emitting source of a photoelectric coupler is arranged in the dimming circuit, and a light receiver of the photoelectric coupler is arranged in the PWM conversion circuit and used for changing the PWM duty ratio in the PWM conversion circuit through the voltage change of the dimming circuit so as to realize LED dimming; the luminous flux adjusting circuit comprises a first switching device used for switching the luminous flux of the LED. A down lamp is also disclosed. Has the advantages that: the operation is convenient, the requirements of different users can be met, and the switching device in the down lamp is arranged externally, so that the adjustment is convenient.

Description

LED luminous flux and color temperature regulating circuit and down lamp with same

Technical Field

The utility model relates to the field of lighting, in particular to LED luminous flux and colour temperature regulating circuit and have this regulating circuit's down lamp.

Background

In the field of LED lighting, LED lamps have been widely applied to daily life of people, people select LED lamps with different color temperatures according to different needs of places, and dimming flux and color temperature of LED lighting lamps are always the focus of attention of people, so-called luminous flux is the radiation power that human eyes can feel, luminous flux emitted by a light source in a unit solid angle in a specified direction is the luminous intensity, and is generally regarded as the intensity of light emitted by the light source; the term "color temperature" is generally used to refer to the adjustment of the color of a light source, and refers to the temperature of a black body at which the color of light emitted from the light source coincides with the hue of light emitted from the black body at a certain temperature. Therefore, the LED lighting fixture needs to be adjusted to output different luminous fluxes and color temperatures from the LEDs.

A chinese utility model patent with application number CN201621347014.1 (publication number CN206323600U) discloses an LED driving circuit for simultaneously changing luminous flux and light color temperature, which comprises a luminous flux adjusting circuit, a color temperature adjusting circuit, and an output LED load; the output LED load comprises at least two groups of LED light sources with different light emitting color temperatures, the color temperature adjusting circuit comprises a comparator and a switch device, one output end of the comparator is provided with a reference voltage, and the voltage of the other input end of the comparator is increased along with the increase of the current output by the luminous flux adjusting circuit; the output end of the comparator is connected with the grid of the switch device, and the switch controls the conduction and the closing of one group of LED light sources so as to change the color temperature of the emergent light. The circuit can change the luminous flux and the light color temperature simultaneously, but the current in the circuit can only be gradually increased through the luminous flux adjusting circuit, so that the current input to the LED light source is controlled to be increased, the color temperature of the LED light source is changed, and therefore the circuit is inconvenient to operate and cannot change the color temperature and the luminous flux of the LED light source independently.

With the development of society, down lamps have become the main lighting products, but only have a luminous flux and the colour temperature gear is less when the down lamp in the existing market is designed, and monotony inflexible can't satisfy customer's demand. Further improvements are therefore also needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is the current situation to prior art, thereby provides one kind and conveniently operates and enables LED and present different colour temperature and luminous flux and satisfy the LED luminous flux and the colour temperature regulating circuit of different user demands.

The utility model discloses the second technical problem that will solve is to prior art's current situation, provides a down lamp that has above-mentioned LED luminous flux and colour temperature regulating circuit.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a LED luminous flux and colour temperature regulating circuit, includes supply circuit, colour temperature regulating circuit and luminous flux regulating circuit, luminous flux regulating circuit and colour temperature regulating circuit all are connected with supply circuit, including the second switching device in the colour temperature regulating circuit for switch LED's colour temperature through the second switching device, its characterized in that: the LED dimming circuit is characterized by further comprising a dimming circuit and a PWM conversion circuit, wherein the PWM conversion circuit is connected with the power supply circuit, a light emitting source of a photoelectric coupler is arranged in the dimming circuit, and a light receiver of the photoelectric coupler is arranged in the PWM conversion circuit and used for changing the PWM duty ratio in the PWM conversion circuit through the voltage change of the dimming circuit so as to realize LED dimming; the luminous flux adjusting circuit comprises a first switching device and is used for switching the luminous flux of the LED through the first switching device.

As an improvement, the dimming circuit further comprises a dimmer, a fourth transformer, a PWM generating chip, a sixth resistor and a second capacitor, wherein the dimmer is used for generating a voltage of 0-10V, two ends of the dimmer are respectively connected to a 1 st end of a primary winding and a 2 nd end of a secondary winding of the fourth transformer, a 3 rd end of the primary winding of the fourth transformer is connected to a 5 th pin of the PWM generating chip, a 5 th pin of the PWM generating chip is connected to one end of the fourth capacitor, the other end of the fourth capacitor is connected to a 4 th end of the secondary winding of the fourth transformer and is grounded, a 4 th pin of the PWM generating chip is connected to the positive electrode of a light emitting source of the photoelectric coupler through the sixth resistor, and the negative electrode of the light emitting source of the photoelectric coupler is grounded.

Further, the PWM conversion circuit includes a control chip, the luminous flux adjusting circuit is connected to the 1 st pin of the control chip, and the light receiver of the photoelectric coupler is connected to the control chip.

The PWM conversion circuit further comprises a fourteenth capacitor, a thirty-first resistor, a thirty-second resistor and a forty-first resistor, wherein a pin 8 of the control chip is connected with one end of the fourteenth capacitor and one end of the thirty-first resistor respectively, the other end of the fourteenth capacitor is grounded, the thirty-second resistor, a light receiver of the photoelectric coupler and the forty-first resistor are sequentially connected in series, the other end of the thirty-second resistor is connected with a third power supply, the other end of the forty-first resistor is grounded, and the other end of the thirty-first resistor is connected between a node connecting wire connected with the light receiver of the photoelectric coupler and the forty-first resistor.

In this scheme, the luminous flux adjusting circuit further includes a seventh resistor, an eighth resistor, a ninth resistor, and a sixth capacitor, where one end of the sixth capacitor and the seventh resistor connected in parallel is connected to pin 1 of the control chip, the other end of the sixth capacitor is connected to the eighth resistor, the connection end of the eighth resistor is also connected to the fourth power supply, the eighth resistor and the ninth resistor are connected in parallel, the other end of the eighth resistor is connected to the first active end of the first switch device, the second active end of the first switch device is unloaded, and the fixed end of the first switch device is grounded.

Furthermore, the color temperature adjusting circuit further comprises a first diode, a second diode, a third diode, a fourth diode, a tenth resistor, an eleventh resistor and a twelfth resistor, wherein a second active end of the second switch device is connected with one end of the tenth resistor, the eleventh resistor and the twelfth resistor are connected in parallel in sequence, the other end of the tenth resistor is connected with a cathode of the third diode, a third active end of the second switch device is connected with a cathode of the fourth diode, an anode of the fourth diode is connected with an anode of the third diode and connected with a first power supply, a fourth active end of the second switch device is connected between node connecting wires connected with the third diode and the first power supply, a first active end of the second switch device is respectively connected with an anode of the first diode and an anode of the second diode, and the positive pole of the second diode is also connected with a second power supply, the negative pole of the first diode is connected between the node connecting wires connected with the third movable end and the fourth diode, the negative pole of the second diode is connected between the node connecting wires connected with the second movable end and the tenth resistor, and the fixed end of the second switch device is connected with the output end of the power supply circuit.

In this scheme, including EMI suppression circuit, main transformer and rectification filter circuit in the power supply circuit, EMI suppression circuit's input is connected with the commercial power, EMI suppression circuit's output is connected with rectification filter circuit's input, main transformer includes primary winding and secondary winding, rectification filter circuit's input is connected with PWM transform circuit, just PWM transform circuit's output is connected on main transformer's primary winding, colour temperature regulating circuit connects on main transformer's secondary winding.

As an improvement, the EMI suppression circuit includes a first transformer, a second transformer, a voltage dependent resistor, a fuse, and a first capacitor, the 1 st end of the primary winding and the 2 nd end of the secondary winding of the first transformer are respectively connected with the zero line and the live line of the utility power, and the fuse is further connected between the 1 st end of the primary winding and the live line, the 3 rd end of the primary winding and the 4 th end of the secondary winding of the first transformer are respectively connected with the 1 st end of the primary winding and the 2 nd end of the secondary winding of the second transformer, and both ends of the voltage dependent resistor and the first capacitor are respectively connected between the node connection lines connected between the 3 rd end of the primary winding of the first transformer and the 1 st end of the primary winding of the second transformer and between the node connection lines connected between the 4 th end of the secondary winding of the first transformer and the 2 nd end of the secondary winding of the second transformer, and the 3 rd end of the primary winding and the 4 th end of the secondary winding of the second transformer are output ends of.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: the utility model provides a down lamp, includes lamp shade, LED lamp, circuit board and power cover, the top of lamp shade is located to the power cover, the LED lamp is located in the lamp shade, the circuit board is located in the power cover, its characterized in that: the circuit board is provided with the LED luminous flux and color temperature adjusting circuit, the LED lamp is electrically connected with the LED luminous flux and color temperature adjusting circuit on the circuit board, and the first switch device and the second switch device are arranged outside the power supply cover and are connected with the circuit board in the power supply cover through leads.

Specifically, the lateral wall of power cover sets up the first through-hole that supplies the wire to pass, the periphery cover of wire is equipped with the hose, the one end of hose insert join in marriage connect in the first through-hole.

Compared with the prior art, the utility model has the advantages of: the light flux and the color temperature of the LED are adjusted through the switching of the first switch device and the second switch device, the dimming circuit is associated with the PWM conversion circuit through a photoelectric coupler in the isolated dimming circuit, and therefore the dimming of the LED is achieved, and the brightness of the LED can be further adjusted on the basis of the switched light flux. Therefore, the circuit can be more flexible and convenient to operate, the LED can present different luminous fluxes, color temperatures and brightness only by the aid of the first switch device, the second switch device and the light modulator, the requirements of different users can be met, the switch devices in the down lamp are external, adjustment is convenient, and the down lamp has good practicability.

Drawings

Fig. 1 is a circuit diagram of a luminous flux and color temperature adjusting circuit according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a down lamp in an embodiment of the present invention;

fig. 3 is a partially exploded view of fig. 2.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1, an LED luminous flux and color temperature adjusting circuit includes a power supply circuit, a color temperature adjusting circuit 2, a luminous flux adjusting circuit 3, a dimming circuit 4 and a PWM converting circuit 5, wherein the power supply circuit includes an EMI suppression circuit 11, a main transformer T3 and a rectification filter circuit 12, an input terminal of the EMI suppression circuit 11 is connected to a mains supply, an output terminal of the EMI suppression circuit 11 is connected to an input terminal of the rectification filter circuit 12, an output terminal of the rectification filter circuit 12 is connected to a primary winding of the main transformer T3 through the PWM converting circuit 5, the luminous flux adjusting circuit 3 is connected to the PWM converting circuit 5, and the color temperature adjusting circuit 2 is connected to a secondary winding of the main transformer T3; the light flux adjusting circuit 3 includes a first switching device S1, and the color temperature adjusting circuit 2 includes a second switching device S2, and the light flux and the color temperature of the LED are switched by the first switching device S1 and the second switching device S2.

The light-emitting source PC1A of the photocoupler PC1 is provided in the light-adjusting circuit 4, and the light-receiving device PC1B of the photocoupler PC1 is provided in the PWM conversion circuit 5, and changes the PWM duty ratio in the PWM conversion circuit 5 by changing the voltage of the light-adjusting circuit 4, thereby adjusting the light of the LED.

The EMI suppression circuit 11 includes a first transformer T1, a second transformer T2, a voltage dependent resistor RV1, a fuse F1, and a first capacitor C1, wherein the 1 st end of the primary winding and the 2 nd end of the secondary winding of the first transformer T1 are respectively connected to the mains, a fuse F1 is connected between the 1 st end of the primary winding and the commercial power, the 3 rd end of the primary winding and the 4 th end of the secondary winding of the first transformer T1 are respectively connected with the 1 st end of the primary winding and the 2 nd end of the secondary winding of the second transformer T2, and both ends of the voltage dependent resistor RV1 and the first capacitor C1 are respectively connected between the node connection lines connected between the 3 rd end of the primary winding of the first transformer T1 and the 1 st end of the primary winding of the second transformer T2 and between the 4 th end of the secondary winding of the first transformer T1 and the 2 nd end of the secondary winding of the second transformer T2, and the 3 rd end of the primary winding and the 4 th end of the secondary winding of the second transformer T2 are output ends of the EMI suppression circuit. The power supply in the existing lamp is input by 120V narrow voltage, and the use of 120-347V ultra-wide and ultra-high input voltage can be met by the EMI suppression circuit in the circuit.

The dimming circuit 4 further comprises a dimmer for generating a voltage of 0-10V, a fourth transformer T4, a PWM generation chip U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and a voltage regulator tube ZD1, wherein the PWM generation chip U2 is provided with 8 pins, and in the embodiment, the model number of the PWM generation chip U2 is iw 350; two ends DIM + and DIM of the dimmer are respectively connected with the 1 st end of a primary winding and the 2 nd end of a secondary winding of a fourth transformer T4, the 3 rd end of a primary winding of the fourth transformer T4 is connected with the 5 th pin of a PWM generating chip U2, the 5 th pin of the PWM generating chip U2 is connected with one end of a fourth capacitor C4, the other end of the fourth capacitor C4 is connected with the 4 th end of the secondary winding of the fourth transformer T4 and is grounded, one end of a voltage stabilizing tube ZD1 is connected between the 5 th pin of the PWM generating chip U2 and a node connecting line connected with the 3 rd end of the primary winding of the fourth transformer T4, the 6 th pin of the PWM generating chip U2 is respectively connected with one ends of a first resistor R1 and a second resistor R2, the 7 th pin of the PWM generating chip U2 is connected with one end of a second capacitor C2, the voltage stabilizing tube ZD1, the first resistor R1, the second resistor R37R 2 and the other end of the second capacitor C68642 are connected with the second node connecting line of the secondary winding of the fourth capacitor T464, the 8 th pin of the PWM generating chip U2 is connected to one end of a fourth resistor R4, the other end of the fourth resistor R4 is respectively connected to one ends of a third resistor R3 and a fifth resistor R5, the other end of the fifth resistor R5 is connected between a fourth capacitor C4 and a node connection line connected to the 4 th end of the secondary winding of the fourth transformer T4, the other end of the third resistor R3 is connected to the 1 st pin of the PWM generating chip U2 and a fifth capacitor C5, the other end of the fifth capacitor C5 is connected to the 2 nd pin of the PWM generating chip U2 and grounded, the 3 rd pin of the PWM generating chip U2 is connected to one end of a third capacitor C3, the 4 th pin of the PWM generating chip U2 is connected to the positive pole of a light emitting source PC1A of the photocoupler PC1 through a sixth resistor R6, and the negative pole of the light emitting source PC1A of the photocoupler PC1 is connected to the other end of the third capacitor C3 and grounded.

The PWM converting circuit 5 comprises a control chip U1 and a peripheral circuit connected with the control chip U1, the luminous flux adjusting circuit 3 is connected with the 1 st pin of the control chip U1, the light receiver PC1B of the photoelectric coupler PC1 is connected with the 8 th pin of the control chip U1 through the peripheral circuit, wherein, the PWM conversion circuit 5 further includes a fourteenth capacitor C14, a thirty-first resistor R31, a thirty-second resistor R32 and a forty-first resistor R41, the 8 th pin of the control chip U1 is respectively connected to one end of the fourteenth capacitor C14 and one end of the thirty-first resistor R31, the other end of the fourteenth capacitor C14 is grounded, the thirty-second resistor R32, the photo-receiver PC1B of the photo-coupler PC1 and the forty-first resistor R41 are sequentially connected in series, the other end of the thirty-second resistor R32 is connected to the third power supply VCCP, the other end of the forty-first resistor R41 is grounded, and the other end of the thirty-first resistor R31 is connected between the node connection lines connecting the photo-receiver PC1B and the forty-first resistor R41 of the photo-coupler PC 1.

The dimmer controls two ends of a DIM + and a DIM-of the dimming circuit 4 to generate different voltages between 0 and 10V, a 5 th pin of the PWM generating chip U2 receives different voltages, then, the interior of the PWM generating chip U2 will operate by itself, and generate PWM waveforms with different duty ratios through the 4 th pin of the PWM generating chip U2, this PWM waveform is transmitted to the light receiver PC1B of the photocoupler PC1 of the PWM conversion circuit 5 through the light emitting source PC1A of the photocoupler PC1, the photo-receiver PC1B of the photo-coupler PC1 feeds back the result to the 8 th pin of the control chip U1 of the PWM conversion circuit 5, the PWM waveforms of different duty ratios have different corresponding levels in the 8 th pin of the control chip U1, therefore, the level of the 8 th pin of the control chip U1 can be changed through the dimmer, and the output current can be changed by changing the level of the 8 th pin, so that the dimming of the LED is realized.

The luminous flux adjusting circuit 3 comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a sixth capacitor C6, wherein one end of the sixth capacitor C6 and one end of the seventh resistor R7 which are connected in parallel are connected to a pin 1 of a control chip U1, the other end of the sixth capacitor C6 and the seventh resistor R7 which are connected in parallel are connected to an eighth resistor R8, a connection end of the eighth resistor R8 is also connected to a fourth power supply VA, the eighth resistor R8 is connected in parallel to a ninth resistor R9, the other end of the eighth resistor R8 is connected to a first active end 1 of a first switching device S1, a second active end 2 of the first switching device S1 is unloaded, and a fixed end 3 of the first switching device S1 is.

The color temperature adjusting circuit 2 further comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, the second active terminal 2 of the second switching device S2 is connected to one end of the tenth resistor R10, and the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 are connected in parallel in sequence, the other end of the tenth resistor R10 is connected to the cathode of the third diode D3, the third active terminal 3 of the second switching device S2 is connected to the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected to the anode of the third diode D3 and is connected to the first power source V1, the fourth active terminal 4 of the second switching device S2 is connected between the connection line of the third diode D3 and the node of the first power source V1, the first active terminal S8741 of the second switching device S2 is connected to the anode of the first diode D1 and the second diode D2, and the anode of the second diode D2 is further connected with a second power supply V2, the cathode of the first diode D1 is connected between the node connection lines connecting the third active end 1 and the fourth diode D4, the cathode of the second diode D2 is connected between the second active end 2 and the node connection line connecting the tenth resistor R10, and the fixed end 1 of the second switching device S2 is connected to the peripheral circuit of the secondary winding of the main transformer T3.

The working principle of the circuit is as follows: the LED is enabled to switch two different powers, i.e. correspondingly to different luminous fluxes, by a first switching device S1 in the luminous flux regulating circuit 3; the solid end 5 of the second switching device S2 can be switched to be connected with different movable ends, so that the switching of different color temperatures of the LED can be realized; in addition, the dimmer controls the PWM generating chip U2 to generate PWM waveforms with different duty ratios, and the PWM waveforms are transmitted to the control chip U1 of the PWM conversion circuit 5 through the photocoupler PC1 to change the output current of the main transformer T3, thereby realizing dimming of the LED. Therefore, the circuit realizes the adjustment of the luminous flux and the color temperature of the LED through the first switching device S1 and the second switching device S2, and realizes the association of the dimming circuit 4 and the PWM conversion circuit 5 in the main circuit through the relationship between the luminous source PC1A and the light receiver PC1B of the photoelectric coupler PC1, and also can perform dimming, so that the brightness of the LED is further adjusted on the basis of the selected luminous flux, the LED can present different luminous flux, color temperature and brightness, and the requirements of different users can be met.

As shown in fig. 2, a downlight comprises a lampshade 6, an LED lamp (not shown in the figure), a circuit board 7 and a power supply cover 8, wherein the lampshade 6 is internally provided with an LED lighting assembly which is the same as the prior downlight, the power supply cover 8 is arranged at the top of the lampshade 6, the LED lamp is arranged in the lampshade 6, the circuit board 7 is arranged in the power supply cover 8, the circuit board 7 is a circuit board with the above-mentioned LED luminous flux and color temperature adjusting circuit, the LED lamp is electrically connected with the LED luminous flux and color temperature adjusting circuit on the circuit board 7, as shown in fig. 3, the first switch device S1 and the second switch device S2 are both disposed outside the power supply cover 8, a through hole 81 for the lead 9 to pass through is formed in a side wall of the power supply cover 8, a hose 10 is sleeved on an outer circumference of the lead 9, a connector 11 is disposed at one end of the hose 10, the hose 10 is inserted into the through hole 81 through a joint, and the first switching device and the second switching device are connected with the circuit board 7 in the power supply cover 8 through the lead 9. In this embodiment, as shown in fig. 3, the first switch device and the second switch device are both sliding buttons, and the sliding buttons are used to switch the LED lamp to different luminous fluxes and color temperatures; the first switching element of the light flux of adjusting is connected with LED luminous flux and colour temperature regulating circuit in the power supply cover 8 through two 18AWG electronic wires, the second switching element of the colour temperature of adjusting is connected with LED luminous flux and colour temperature regulating circuit in the power supply cover 8 through four 24AWG silica gel wires, and two 18AWG electronic wires and four 24AWG silica gel wires are all sleeved in a hose 10.

Present down lamp has only a luminous flux and less colour temperature gear, and is dull inflexible, can't satisfy different customers ' demand, the utility model provides a down lamp compares with current down lamp, through arranging first switching device and second switching device in the power cover outside, has a plurality of gears, conveniently adjusts the luminous flux and the colour temperature of LED lamp, makes this down lamp can satisfy different customers ' demand.

Claims

1. An LED luminous flux and color temperature adjusting circuit, includes supply circuit, color temperature adjusting circuit (2) and luminous flux adjusting circuit (3), luminous flux adjusting circuit (3) and color temperature adjusting circuit (2) all are connected with supply circuit, include second switching device (S2) in the color temperature adjusting circuit (2) for switch the color temperature of LED through second switching device (S2), its characterized in that: the LED dimming circuit is characterized by further comprising a dimming circuit (4) and a PWM conversion circuit (5), wherein the PWM conversion circuit (5) is connected with the power supply circuit (1), a light emitting source (PC1A) of a photoelectric coupler (PC1) is arranged in the dimming circuit (4), and a light receiver (PC1B) of the photoelectric coupler (PC1) is arranged in the PWM conversion circuit (5) and used for changing the PWM duty ratio in the PWM conversion circuit (5) through the voltage change of the dimming circuit (4) so as to realize LED dimming; the luminous flux adjusting circuit (3) includes therein a first switching device (S1) for switching the luminous flux of the LED through the first switching device (S1).

2. The LED luminous flux and color temperature adjustment circuit of claim 1, wherein: the dimming circuit (4) further comprises a dimmer for generating a voltage of 0-10V, a fourth transformer (T4), a PWM generating chip (U2), a sixth resistor (R6) and a second capacitor (C2), the two ends (DIM +, DIM-) of the dimmer are respectively connected with the 1 st end of the primary winding and the 2 nd end of the secondary winding of a fourth transformer (T4), the 3 rd end of the primary winding of the fourth transformer (T4) is connected with the 5 th pin of a PWM generating chip (U2), and the 5 th pin of the PWM generating chip (U2) is connected with one end of a fourth capacitor (C4), the other end of the fourth capacitor (C4) is connected with the 4 th end of the secondary winding of the fourth transformer (T4) and is grounded, the 4 th pin of the PWM generating chip (U2) is connected with the anode of a luminous source (PC1A) of a photoelectric coupler (PC1) through a sixth resistor (R6), and the cathode of the luminous source (PC1A) of the photoelectric coupler (PC1) is grounded.

3. The LED luminous flux and color temperature adjustment circuit of claim 2, wherein: the PWM conversion circuit (5) comprises a control chip (U1), the luminous flux adjusting circuit (3) is connected with the 1 st pin of the control chip (U1), and a light receiver (PC1B) of the photoelectric coupler (PC1) is connected with the control chip (U1).

4. The LED luminous flux and color temperature adjustment circuit of claim 3, wherein: the PWM conversion circuit (5) further comprises a fourteenth capacitor (C14), a thirty-first resistor (R31), a thirty-second resistor (R32) and a forty-first resistor (R41), wherein a pin 8 of the control chip (U1) is respectively connected with one ends of the fourteenth capacitor (C14) and the forty-first resistor (R31), the other end of the fourteenth capacitor (C14) is grounded, the thirty-second resistor (R32), a light receiver (PC1B) and the forty-first resistor (R41) of the photoelectric coupler (PC1) are sequentially connected in series, the other end of the thirty-second resistor (R32) is connected with a third power supply (VCCP), the other end of the forty-first resistor (R41) is grounded, and the other end of the thirty-first resistor (R31) is connected between a node connecting wire where the light receiver (PC1B) and the forty-first resistor (R41) of the photoelectric coupler (PC1) are connected.

5. The LED luminous flux and color temperature adjustment circuit of claim 3, wherein: the luminous flux adjusting circuit (3) further comprises a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9) and a sixth capacitor (C6), one end of the sixth capacitor (C6) and one end of the seventh resistor (R7) which are connected in parallel are connected to a pin 1 of a control chip (U1), the other end of the sixth capacitor is connected with the eighth resistor (R8), a connecting end of the sixth capacitor is also connected with a fourth power supply (VA), the eighth resistor (R8) is connected in parallel with a ninth resistor (R9), the other end of the eighth resistor (R8) is connected with a first movable end of a first switch device (S1), a second movable end of the first switch device (S1) is idle, and a fixed end of the first switch device is grounded.

6. The LED luminous flux and color temperature adjustment circuit of claim 1, wherein: the color temperature adjusting circuit (2) further comprises a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), a tenth resistor (R10), an eleventh resistor (R11) and a twelfth resistor (R12), a second active end of the second switching device (S2) is connected with one end of the tenth resistor (R10), the tenth resistor (R10), the eleventh resistor (R11) and the twelfth resistor (R12) are connected in parallel in sequence, the other end of the tenth resistor (R10) is connected with a negative electrode of the third diode (D3), a third active end of the second switching device (S2) is connected with a negative electrode of the fourth diode (D4), a positive electrode of the fourth diode (D4) is connected with a positive electrode of the third diode (D3) and connected with the first power supply (V1), and a first active end of the second switching device (S375) is connected between a first power supply node (D5857324) and a first power supply node (D3), the positive pole of first diode (D1) and the positive pole of second diode (D2) are connected respectively to the first active terminal of second switching device (S2), just the positive pole of second diode (D2) still is connected with second power (V2), the negative pole of first diode (D1) is connected between the node connecting wire that third active terminal and fourth diode (D4) are connected, the negative pole of second diode (D2) is connected between the node connecting wire that second active terminal and tenth resistance (R10) are connected, the output of power supply circuit is connected to the stiff end of second switching device (S2).

7. The LED luminous flux and color temperature adjusting circuit according to any one of claims 1 to 6, wherein: the power supply circuit comprises an EMI suppression circuit (11), a main transformer (T3) and a rectification filter circuit (12), wherein the input end of the EMI suppression circuit (11) is connected with a mains supply, the output end of the EMI suppression circuit (11) is connected with the input end of the rectification filter circuit (12), the main transformer (T3) comprises a primary winding and a secondary winding, the input end of the rectification filter circuit (12) is connected with a PWM (pulse-width modulation) conversion circuit (5), the output end of the PWM conversion circuit (5) is connected to the primary winding of the main transformer (T3), and the color temperature adjusting circuit (2) is connected to the secondary winding of the main transformer (T3).

8. The LED luminous flux and color temperature adjustment circuit of claim 7, wherein: the EMI suppression circuit (11) comprises a first transformer (T1), a second transformer (T2), a piezoresistor (RV1), a fuse (F1) and a first capacitor (C1), the 1 st end of a primary winding and the 2 nd end of a secondary winding of the first transformer (T1) are respectively connected with a zero line and a live line of a mains supply, a fuse (F1) is further connected between the 1 st end of the primary winding and the live line, the 3 rd end and the 4 th end of the primary winding of the first transformer (T1) are respectively connected with the 1 st end of the primary winding and the 2 nd end of the secondary winding of the second transformer (T2), and the two ends of the piezoresistor (RV1) and the first capacitor (C1) are respectively connected between the node connection line connecting the 3 rd end of the primary winding of the first transformer (T1) and the 1 st end of the primary winding of the second transformer (T5393) and the secondary node connection line connecting the 4 th end of the secondary winding of the first transformer (T1) and the second node connecting node connection of the second transformer (T462) 84) The 3 rd end of the primary winding and the 4 th end of the secondary winding of the second transformer (T2) are output ends of the EMI suppression circuit (11).

9. The utility model provides a down lamp, includes lamp shade (6), LED lamp, circuit board (7) and power cover (8), the top of lamp shade (6) is located in power cover (8), the LED lamp is located in lamp shade (6), in power cover (8), its characterized in that is located in circuit board (7): the circuit board (7) is provided with the LED luminous flux and color temperature adjusting circuit of claim 1, the LED lamp is electrically connected with the LED luminous flux and color temperature adjusting circuit on the circuit board (7), and the first switch device (S1) and the second switch device (S2) are both arranged outside the power supply cover (8) and are both connected with the circuit board (7) in the power supply cover (8) through leads (9).

10. A downlight according to claim 9, wherein: through-hole (81) that supply wire (9) to pass are seted up to the lateral wall of power cover (8), the periphery cover of wire (9) is equipped with hose (10), the one end of hose (10) insert join in marriage connect in through-hole (81).