Round RWP series silicon controlled rectifier dimming LED driving constant-voltage power supply

Abstract

The utility model relates to the technical field of LEDs, and discloses a circular RWP series silicon controlled rectifier dimming LED driving constant-voltage power supply, which comprises an electromagnetic interference circuit, a first passive damping circuit, a rectification circuit, a second passive damping circuit, a filter circuit, a power factor correction circuit, a flyback circuit, a dimming circuit, an output LED, a single chip microcomputer control circuit, a detection circuit and a constant current source circuit. Wherein the electromagnetic interference circuit, the first passive damping circuit, the rectifying circuit, the second passive damping circuit, the filter circuit, the power factor correction circuit, the flyback circuit, the dimming circuit and the output LED are connected in sequence; the rectifying circuit is further connected with the detection circuit and the constant current source circuit, and the detection circuit, the constant current source circuit and the dimming circuit are all connected with the single-chip microcomputer control circuit. According to the utility model, the compatibility of the circular silicon controlled rectifier dimming power supply is better, the dimming effect is better, and the application scene is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of LED, and specifically to a circular RWP series thyristor dimming LED drive constant voltage power supply. Background Technique

[0002] The LED lighting industry has experienced rapid development in recent years, followed by the continuous improvement of the technical requirements for lighting products in the market. Especially in the field of thyristor power supplies, its compatibility, installation portability, dimming effect, and diverse application scenarios have become the focus of greater concern for users and the market. At present, many thyristor dimming power supplies on the market have some obvious problems, such as unsatisfactory dimming effects and poor compatibility, which directly affect the user experience and the market performance of products.

[0003] In addition, with the progress of technology and the diversification of consumer demands, the personalized demands of customers for the lighting environment are also increasing continuously. They not only require power supply products to work stably in different lighting systems but also hope to have more flexible installation options and more precise light control functions. Therefore, manufacturers and designers in the lighting industry need to develop more advanced thyristor power supply solutions to provide a better dimming experience and wider system compatibility, while also considering ease of use and economy to meet the broad needs of the market. Content of the Utility Model

[0004] In view of the problems in the related art, the utility model provides a circular RWP series thyristor dimming LED drive constant voltage power supply to overcome the above-mentioned technical problems existing in the existing related art.

[0005] For this purpose, the specific technical solution adopted by the utility model is as follows:

[0006] A circular RWP series thyristor dimming LED drive constant voltage power supply includes an electromagnetic interference circuit, a first passive damping circuit, a rectification circuit, a second passive damping circuit, a filtering circuit, a power factor correction circuit, a flyback circuit, a dimming circuit, an output LED, a single-chip microcomputer control circuit, a detection circuit, and a constant current source circuit; wherein, the electromagnetic interference circuit, the first passive damping circuit, the rectification circuit, the second passive damping circuit, the filtering circuit, the power factor correction circuit, the flyback circuit, the dimming circuit, and the output LED are connected in sequence; the output end of the rectification circuit is also respectively connected to the input end of the detection circuit and the input end of the constant current source circuit, and the output end of the detection circuit, the output end of the constant current source circuit, and the output end of the dimming circuit are all connected to the single-chip microcomputer control circuit.

[0007] Further, the first passive damping circuit includes a capacitor CX1, a resistor R28, and a resistor R32. One end of the capacitor CX1 is respectively connected to the output end of the electromagnetic interference circuit and the input end of the rectifier circuit. The other end of the capacitor CX1 is connected to one end of the resistor R28. The other end of the resistor R28 is connected to one end of the resistor R32. The other end of the resistor R32 is respectively connected to the output end of the electromagnetic interference circuit and the input end of the rectifier circuit.

[0008] Further, the second passive damping circuit includes a capacitor C2, a resistor R35, and a resistor R45. One end of the capacitor C2 is respectively connected to the output end of the rectifier circuit and the input end of the filter circuit. The other end of the capacitor C2 is connected to one end of the resistor R35. The other end of the resistor R35 is connected to one end of the resistor R45. The other end of the resistor R45 is respectively connected to the output end of the rectifier circuit and the input end of the filter circuit.

[0009] Further, the power factor correction circuit includes chip U4, inductor T1, MOS transistor Q3, diode D3, diode D4, capacitor CE1, capacitor CE6, capacitor C3, capacitor C6, capacitor C7, capacitor C20, capacitor C32, resistor R2, resistor R4, resistor R5, resistor R6, resistor R10, resistor R14, resistor R16, resistor R18B, resistor R21, resistor R22, resistor 23A, resistor R46, resistor R50, and resistor R71. Among them, the third pin of chip U4 is connected to one end of resistor R2, one end of resistor R6, one end of capacitor C3, one end of capacitor C6, and the sixth pin of chip U4 and is grounded. The other end of resistor R2, the other end of resistor R6, and the other end of capacitor C3 are all connected to one end of resistor R22. The other end of resistor R22 is connected to one end of resistor R71. The other end of resistor R71 is connected to one end of resistor R23A. The other end of capacitor C6 is connected to one end of resistor R4 and the fourth pin of chip U4. The fifth pin of chip U4 is connected to one end of inductor T1, the positive pole of diode D4, one end of resistor R46, one end of capacitor C32, and the drain of MOS transistor Q3. The other end of inductor T1 is connected to the output end of the filter circuit and one end of resistor R10. The other end of resistor R10 is connected to one end of resistor R21. The other end of resistor R21 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C7, one end of capacitor CE6, and the eighth pin of chip U4. The other end of capacitor C7 and the other end of capacitor CE6 are both grounded. The seventh pin of chip U4 is connected to one end of resistor R50. The other end of resistor R50 is connected to the negative pole of diode D3 and one end of resistor R14. The other end of resistor R14 is connected to the positive pole of diode D3, one end of resistor R16, and the gate of MOS transistor Q3. The source of MOS transistor Q3 is connected to the other end of capacitor C32, the other end of resistor R16, the other end of resistor R4, and one end of resistor R18B. The other end of resistor R18B is grounded.

[0010] Further, the detection circuit includes optocoupler U9, triode Q6, resistor R60, resistor R67, resistor R68, resistor R69, resistor R70, and resistor R72. Among them, the first pin of the primary side of optocoupler U9 is connected to the emitter of triode Q6. The collector of triode Q6 is connected to one end of resistor R70. The base of triode Q6 is connected to one end of resistor R68 and one end of resistor R69. The other end of resistor R68 is connected to one end of resistor R67. The other end of resistor R67 is connected to one end of resistor R60. The second pin of the primary side of optocoupler U9 is connected to the other end of resistor R69 and is grounded. The third pin of the secondary side of optocoupler U9 is connected to analog ground. The fourth pin of the secondary side of optocoupler U9 is connected to one end of resistor R72.

[0011] Further, the constant current source circuit includes optocoupler U7, three-terminal voltage regulator U8, rectifier bridge BD2, MOS transistor Q1, capacitor C5, capacitor C8, capacitor C10, resistor R8, resistor R17, resistor R20, resistor R33, resistor R49, resistor R51, resistor R52, resistor R53, resistor R54, resistor R55, resistor R56, resistor R57, resistor R58, resistor R59, and resistor RJ1. Among them, the gate of MOS transistor Q1 is connected to one end of resistor R51, and the other end of resistor R51 is respectively connected to one end of capacitor C5, one end of resistor R49, and the cathode of three-terminal voltage regulator U8. The other end of capacitor C5 is respectively connected to one end of resistor R55, one end of resistor R20, one end of resistor R54, one end of capacitor C8, the reference pole of three-terminal voltage regulator U8, and one end of resistor R20. The other end of capacitor C8 is respectively connected to the other end of resistor R54 and the other end of resistor R54, the anode of three-terminal voltage regulator U8, the negative output terminal of rectifier bridge BD2, one end of resistor R53, one end of resistor R52, one end of capacitor C10, and the second pin of the primary side of optocoupler U7. The source of MOS transistor Q1 is respectively connected to the other end of resistor R52, the other end of resistor R53, and the other end of resistor R55. The drain of MOS transistor Q1 is respectively connected to one end of resistor R56 and one end of resistor R57. The other end of resistor R56 is respectively connected to the other end of resistor R57, one end of resistor R58, one end of resistor R33, one end of resistor R8, and the positive output terminal of rectifier bridge BD2. The other end of resistor R33 is connected to the other end of resistor R49. The other end of resistor R8 is connected to one end of resistor R17. The other end of resistor R17 is connected to the other end of resistor R20. The other end of resistor R58 is connected to one end of resistor R59. The other end of resistor R59 is connected to one end of resistor RJ1. The other end of resistor RJ1 is respectively connected to the other end of capacitor C10 and the first pin of the primary side of optocoupler U7.

[0012] The beneficial effects of the present utility model are as follows: The present utility model can make the compatibility of the circular thyristor dimming power supply better, the dimming effect better, and the application scenarios more extensive. By adding RC circuits both before and after the bridge, and at the same time adding a constant current source circuit and a dummy load circuit, the power supply maintains a large current, thus being compatible with most knob control circuits in the market. By adding a detection voltage circuit, a little delay is added to the dimming signal, so that the jitter problem during dimming is solved and the dimming effect is greatly improved. In addition, at present, most of the circular thyristor dimming power supplies on the market output constant current, while this power supply outputs a constant voltage of 24V and can be connected to a light strip, which changes the application scenarios and is no longer limited to the form of indoor downlights and spotlights, meeting the diverse needs of people for the use of thyristor power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a principle block diagram of a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention;

[0015] Figure 2 It is a connection circuit diagram of an EMI circuit, a passive damping circuit, a rectification circuit and a filtering circuit in a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention;

[0016] Figure 3 It is a circuit diagram of a power factor correction circuit and a single-chip microcomputer control circuit in a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention;

[0017] Figure 4 It is a circuit diagram of a flyback circuit in a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention;

[0018] Figure 5 It is a circuit diagram of a dimming circuit and an output LED in a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention;

[0019] Figure 6 It is a circuit diagram of a detection circuit in a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention;

[0020] Figure 7 It is a circuit diagram of a constant current source circuit in a circular RWP series thyristor dimming LED driver constant voltage power supply according to an embodiment of the present invention.

[0021] In the figure:

[0022] 1. Electromagnetic interference circuit; 2. First passive damping circuit; 3. Rectification circuit; 4. Second passive damping circuit; 5. Filtering circuit; 6. Power factor correction circuit; 7. Flyback circuit; 8. Dimming circuit; 9. Output LED; 10. Single-chip microcomputer control circuit; 11. Detection circuit; 12. Constant current source circuit. Detailed implementation manners

[0023] To further illustrate the embodiments, the present utility model provides attached drawings, which are a part of the disclosure of the present utility model. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0024] According to an embodiment of the present utility model, a circular RWP series thyristor dimming LED driving constant voltage power supply is provided.

[0025] Now, the present utility model will be further described in conjunction with the attached drawings and specific implementation manners. As Figures 1 - 7 shown, the circular RWP series thyristor dimming LED driving constant voltage power supply according to an embodiment of the present utility model includes an electromagnetic interference circuit 1, a first passive damping circuit 2, a rectifier circuit 3, a second passive damping circuit 4, a filter circuit 5, a power factor correction circuit 6, a flyback circuit 7, a dimming circuit 8, an output LED 9, a single-chip microcomputer control circuit 10, a detection circuit 11, and a constant current source circuit 12. Among them, the electromagnetic interference circuit 1, the first passive damping circuit 2, the rectifier circuit 3, the second passive damping circuit 4, the filter circuit 5, the power factor correction circuit 6, the flyback circuit 7, the dimming circuit 8, and the output LED 9 are connected in sequence. The output end of the rectifier circuit 3 is also respectively connected to the input end of the detection circuit 11 and the input end of the constant current source circuit 12. The output end of the detection circuit 11, the output end of the constant current source circuit 12, and the output end of the dimming circuit 8 are all connected to the single-chip microcomputer control circuit 10.

[0026] In one embodiment, the first passive damping circuit 2 includes a capacitor CX1, a resistor R28, and a resistor R32. Among them, one end of the capacitor CX1 is respectively connected to the output end of the electromagnetic interference circuit 1 and the input end of the rectifier circuit 3. The other end of the capacitor CX1 is connected to one end of the resistor R28. The other end of the resistor R28 is connected to one end of the resistor R32. The other end of the resistor R32 is respectively connected to the output end of the electromagnetic interference circuit 1 and the input end of the rectifier circuit 3.

[0027] In one embodiment, the second passive damping circuit 4 includes a capacitor C2, a resistor R35, and a resistor R45. Among them, one end of the capacitor C2 is respectively connected to the output end of the rectifier circuit 3 and the input end of the filter circuit 5. The other end of the capacitor C2 is connected to one end of the resistor R35. The other end of the resistor R35 is connected to one end of the resistor R45. The other end of the resistor R45 is respectively connected to the output end of the rectifier circuit 3 and the input end of the filter circuit 5.

[0028] In one embodiment, the power factor correction circuit 6 includes a chip U4, an inductor T1, a MOS transistor Q3, a diode D3, a diode D4, a capacitor CE1, a capacitor CE6, a capacitor C3, a capacitor C6, a capacitor C7, a capacitor C20, a capacitor C32, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R10, a resistor R14, a resistor R16, a resistor R18B, a resistor R21, a resistor R22, a resistor 23A, a resistor R46, a resistor R50, and a resistor R71. Among them, the third pin of the chip U4 is respectively connected to one end of the resistor R2, one end of the resistor R6, one end of the capacitor C3, one end of the capacitor C6, and the sixth pin of the chip U4 and is grounded. The other end of the resistor R2, the other end of the resistor R6, and the other end of the capacitor C3 are all connected to one end of the resistor R22. The other end of the resistor R22 is connected to one end of the resistor R71. The other end of the resistor R71 is connected to one end of the resistor R23A. The other end of the capacitor C6 is respectively connected to one end of the resistor R4 and the fourth pin of the chip U4. The fifth pin of the chip U4 is respectively connected to one end of the inductor T1, the positive electrode of the diode D4, one end of the resistor R46, one end of the capacitor C32, and the drain of the MOS transistor Q3. The other end of the inductor T1 is respectively connected to the output end of the filter circuit 5 and one end of the resistor R10. The other end of the resistor R10 is connected to one end of the resistor R21. The other end of the resistor R21 is connected to one end of the resistor R5. The other end of the resistor R5 is respectively connected to one end of the capacitor C7, one end of the capacitor CE6, and the eighth pin of the chip U4. The other end of the capacitor C7 and the other end of the capacitor CE6 are both grounded. The seventh pin of the chip U4 is connected to one end of the resistor R50. The other end of the resistor R50 is respectively connected to the negative electrode of the diode D3 and one end of the resistor R14. The other end of the resistor R14 is respectively connected to the positive electrode of the diode D3, one end of the resistor R16, and the gate of the MOS transistor Q3. The source of the MOS transistor Q3 is respectively connected to the other end of the capacitor C32, the other end of the resistor R16, the other end of the resistor R4, and one end of the resistor R18B. The other end of the resistor R18B is grounded.

[0029] In one embodiment, the detection circuit 11 includes an optocoupler U9, a triode Q6, a resistor R60, a resistor R67, a resistor R68, a resistor R69, a resistor R70, and a resistor R72. Among them, the first pin of the primary side of the optocoupler U9 is connected to the emitter of the triode Q6. The collector of the triode Q6 is connected to one end of the resistor R70. The base of the triode Q6 is respectively connected to one end of the resistor R68 and one end of the resistor R69. The other end of the resistor R68 is connected to one end of the resistor R67. The other end of the resistor R67 is connected to one end of the resistor R60. The second pin of the primary side of the optocoupler U9 is connected to the other end of the resistor R69 and is grounded. The third pin of the secondary side of the optocoupler U9 is connected to the analog ground. The fourth pin of the secondary side of the optocoupler U9 is connected to one end of the resistor R72.

[0030] In one embodiment, the constant current source circuit 12 includes an optocoupler U7, a three-terminal voltage regulator U8, a rectifier bridge BD2, a MOS transistor Q1, a capacitor C5, a capacitor C8, a capacitor C10, a resistor R8, a resistor R17, a resistor R20, a resistor R33, a resistor R49, a resistor R51, a resistor R52, a resistor R53, a resistor R54, a resistor R55, a resistor R56, a resistor R57, a resistor R58, a resistor R59, and a resistor RJ1. Among them, the gate of the MOS transistor Q1 is connected to one end of the resistor R51, and the other end of the resistor R51 is respectively connected to one end of the capacitor C5, one end of the resistor R49, and the cathode of the three-terminal voltage regulator U8. The other end of the capacitor C5 is respectively connected to one end of the resistor R55, one end of the resistor R20, one end of the resistor R54, one end of the capacitor C8, the reference electrode of the three-terminal voltage regulator U8, and one end of the resistor R20. The other end of the capacitor C8 is respectively connected to the other end of the resistor R54 and the other end of the resistor R54, the anode of the three-terminal voltage regulator U8, the negative output terminal of the rectifier bridge BD2, one end of the resistor R53, one end of the resistor R52, one end of the capacitor C10, and the second pin of the primary side of the optocoupler U7. The source of the MOS transistor Q1 is respectively connected to the other end of the resistor R52, the other end of the resistor R53, and the other end of the resistor R55. The drain of the MOS transistor Q1 is respectively connected to one end of the resistor R56 and one end of the resistor R57. The other end of the resistor R56 is respectively connected to the other end of the resistor R57, one end of the resistor R58, one end of the resistor R33, one end of the resistor R8, and the positive output terminal of the rectifier bridge BD2. The other end of the resistor R33 is connected to the other end of the resistor R49. The other end of the resistor R8 is connected to one end of the resistor R17. The other end of the resistor R17 is connected to the other end of the resistor R20. The other end of the resistor R58 is connected to one end of the resistor R59. The other end of the resistor R59 is connected to one end of the resistor RJ1. The other end of the resistor RJ1 is respectively connected to the other end of the capacitor C10 and the first pin of the primary side of the optocoupler U7.

[0031] To facilitate the understanding of the above technical solution of the present invention, the working principle of the present invention is described in detail as follows:

[0032] As Figure 2 shown, after the power supply is connected to AC220V, it passes through an EMI circuit composed of F101, RT1, LF2, CX2, L1, RX3, L2, RX4, RX1, RX2, and LF3, and then is connected to a passive RC damping circuit composed of CX1, R28, and R32, and then is divided into two paths, LIN and NIN. One path is connected to the rectifier bridge BD1, and the full-wave rectification converts the input alternating current into direct current, and then is connected to a second group of passive RC damping circuits composed of C2, R35, and R45, and then is connected to a π-type filter circuit composed of C101, L101, RJ101, and C102 to output a pulsating direct current BUCK220VIN. As Figure 3 shown (Figure 3 in and Figure 2 in connection), and then connect the PFC (Power Factor Correction) circuit. Through the on - off of Q3, the inductance characteristic of inductor T1, the one - way conduction characteristic of D4, and the internal comparator detection of U4, and through the voltage - dividing circuit of R23A, R71, R22, R2, R6, the FB voltage is detected, and the PWM driving Q3 is adjusted to make the output VBUS become a relatively stable high - voltage DC voltage with less ripple. As Figure 4 shown ( Figure 4 in and Figure 5 in connection), then VBUS is connected to the flyback circuit. When the PWM signal sent by U2 is at a high level, Q9 conducts, VBUS passes through the primary side of T2, then through Q9 and the sampling resistor RS6 to ground, and the energy is stored in T2; then when the PWM signal sent by U2 is at a low level, Q9 turns off, the energy stored in the transformer T2 is transferred to the secondary side, D9 conducts, charging the output electrolytic capacitors CE3 and CE2, and at the same time the electrolytic capacitors output a low DC voltage. The DC low voltage rises to about 24V, passes through the three - terminal voltage - regulating circuit of U1 and the optocoupler U3 and is fed back to the primary VF. When U2 detects the VF signal, it changes the PWM signal to control the conduction of Q9, making the primary side conduct, the secondary D9 reverse - cut - off, and the electrolytic capacitors CE3 and CE2 stop charging, and the voltage stops rising and stabilizes at about 24V DC voltage. As Figure 5 shown, the DC 24V is then connected to the dimming circuit. The dimming signal of the daughter board controls Q2, which is used as a dimming MOS, to achieve the change of the output LED and reach the dimming purpose.

[0033] As Figure 7 shown, the other path of LIN, NIN is rectified into direct current VD by the rectifier bridge BD2 and is also output at both ends. One end of VD is connected to the 431 constant - current source circuit around U8 as a dummy load, so that the holding current of the front - end thyristor can maintain a large value, ensuring that when dimming is at a low level, there will be no breathing phenomenon in the output LED;

[0034] As Figure 6As shown, the other end VD is connected to the detection circuit. Through the voltage division circuit of R66, R67, R68, and R69, when the voltage at the detection input terminal reaches the set value, the voltage at the connection point between R69 and the base of Q6 reaches the conduction value of Q6. After Q6 conducts, the VCC voltage passes through R70 and then the primary side U9-A of the optocoupler U9 conducts and has current. The secondary side U9-B of the optocoupler also has current flowing through it due to the transmission ratio. The 5V of the single-chip microcomputer circuit passes through R72 and the secondary side U9-B of the optocoupler, then the signal is detected by DE1 and then connected to the single-chip microcomputer control circuit. According to the different signals detected by DE1, the PWM1 signal output by the single-chip microcomputer is given different degrees of delay, making the dimming process smoother.

[0035] In summary, with the above technical solutions of the present invention, the present invention can make the compatibility of the circular thyristor dimming power supply better, the dimming effect better, and the application scenarios more extensive. By adding RC circuits before and after the bridge, and at the same time adding a constant current source circuit and a dummy load circuit, the power supply maintains a large current, thus being compatible with most knob control circuits on the market. By adding a detection voltage circuit and adding a little delay to the dimming signal, the jitter problem during the dimming process is solved and the dimming effect is greatly improved. In addition, at present, most of the circular thyristor dimming power supplies on the market output constant current, while this power supply outputs a constant voltage of 24V and can be connected to the light strip, changing the application scenario and no longer being limited to the form of indoor downlights and spotlights, meeting the diverse needs of people for the use of thyristor power supplies.

[0036] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circular RWP series thyristor dimming LED driver constant voltage power supply, characterized in that, It includes an electromagnetic interference circuit (1), a first passive damping circuit (2), a rectifier circuit (3), a second passive damping circuit (4), a filter circuit (5), a power factor correction circuit (6), a flyback circuit (7), a dimming circuit (8), an output LED (9), a single-chip microcomputer control circuit (10), a detection circuit (11) and a constant current source circuit (12); Among them, the electromagnetic interference circuit (1), the first passive damping circuit (2), the rectifier circuit (3), the second passive damping circuit (4), the filter circuit (5), the power factor correction circuit (6), the flyback circuit (7), the dimming circuit (8) and the output LED (9) are connected in sequence; The output end of the rectifier circuit (3) is also respectively connected to the input end of the detection circuit (11) and the input end of the constant current source circuit (12), and the output end of the detection circuit (11), the output end of the constant current source circuit (12) and the output end of the dimming circuit (8) are all connected to the single-chip microcomputer control circuit (10).

2. The circular RWP series thyristor dimming LED drive constant voltage power supply according to claim 1, wherein The first passive damping circuit (2) includes a capacitor CX1, a resistor R28 and a resistor R32; Among them, one end of the capacitor CX1 is respectively connected to the output end of the electromagnetic interference circuit (1) and the input end of the rectifier circuit (3), the other end of the capacitor CX1 is connected to one end of the resistor R28, the other end of the resistor R28 is connected to one end of the resistor R32, and the other end of the resistor R32 is respectively connected to the output end of the electromagnetic interference circuit (1) and the input end of the rectifier circuit (3).

3. A circular RWP series thyristor dimming LED driver constant voltage power supply according to claim 1, characterized in that, The second passive damping circuit (4) includes a capacitor C2, a resistor R35 and a resistor R45; Among them, one end of the capacitor C2 is respectively connected to the output end of the rectifier circuit (3) and the input end of the filter circuit (5), the other end of the capacitor C2 is connected to one end of the resistor R35, the other end of the resistor R35 is connected to one end of the resistor R45, and the other end of the resistor R45 is respectively connected to the output end of the rectifier circuit (3) and the input end of the filter circuit (5).

4. A circular RWP series thyristor dimming LED driver constant voltage power supply according to claim 1, characterized in that, The power factor correction circuit (6) includes a chip U4, an inductor T1, a MOS transistor Q3, a diode D3, a diode D4, a capacitor CE1, a capacitor CE6, a capacitor C3, a capacitor C6, a capacitor C7, a capacitor C20, a capacitor C32, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R10, a resistor R14, a resistor R16, a resistor R18B, a resistor R21, a resistor R22, a resistor 23A, a resistor R46, a resistor R50 and a resistor R71; Among them, the third pin of the chip U4 is respectively connected to one end of the resistor R2, one end of the resistor R6, one end of the capacitor C3, one end of the capacitor C6 and the sixth pin of the chip U4 and grounded. The other end of the resistor R2, the other end of the resistor R6 and the other end of the capacitor C3 are all connected to one end of the resistor R22. The other end of the resistor R22 is connected to one end of the resistor R71. The other end of the resistor R71 is connected to one end of the resistor R23A. The other end of the capacitor C6 is respectively connected to one end of the resistor R4 and the fourth pin of the chip U4; The fifth pin of the chip U4 is respectively connected to one end of the inductor T1, the positive electrode of the diode D4, one end of the resistor R46, one end of the capacitor C32 and the drain of the MOS transistor Q3. The other end of the inductor T1 is respectively connected to the output end of the filter circuit (5) and one end of the resistor R10. The other end of the resistor R10 is connected to one end of the resistor R21. The other end of the resistor R21 is connected to one end of the resistor R5. The other end of the resistor R5 is respectively connected to one end of the capacitor C7, one end of the capacitor CE6 and the eighth pin of the chip U4. The other end of the capacitor C7 and the other end of the capacitor CE6 are both grounded; The seventh pin of the chip U4 is connected to one end of the resistor R50. The other end of the resistor R50 is respectively connected to the negative electrode of the diode D3 and one end of the resistor R14. The other end of the resistor R14 is respectively connected to the positive electrode of the diode D3, one end of the resistor R16 and the gate of the MOS transistor Q3. The source of the MOS transistor Q3 is respectively connected to the other end of the capacitor C32, the other end of the resistor R16, the other end of the resistor R4 and one end of the resistor R18B. The other end of the resistor R18B is grounded.

5. A circular RWP series thyristor dimming LED drive constant voltage power supply according to claim 1, characterized in that, The detection circuit (11) includes an optocoupler U9, a triode Q6, resistors R60, R67, R68, R69, R70 and R72; Among them, the first pin of the primary side of the optocoupler U9 is connected to the emitter of the triode Q6. The collector of the triode Q6 is connected to one end of the resistor R70. The base of the triode Q6 is respectively connected to one end of the resistor R68 and one end of the resistor R69. The other end of the resistor R68 is connected to one end of the resistor R67. The other end of the resistor R67 is connected to one end of the resistor R60; The second pin of the primary side of the optocoupler U9 is connected to the other end of the resistor R69 and grounded. The third pin of the secondary side of the optocoupler U9 is connected to the analog ground. The fourth pin of the secondary side of the optocoupler U9 is connected to one end of the resistor R72.

6. The circular RWP series thyristor dimming LED drive constant voltage power supply according to claim 1, wherein, The constant current source circuit (12) includes an optocoupler U7, a three-terminal voltage regulator U8, a rectifier bridge BD2, an MOS transistor Q1, a capacitor C5, a capacitor C8, a capacitor C10, resistors R8, R17, R20, R33, R49, R51, R52, R53, R54, R55, R56, R57, R58, R59, and a resistor RJ1; Among them, the gate of the MOS transistor Q1 is connected to one end of the resistor R51. The other end of the resistor R51 is respectively connected to one end of the capacitor C5, one end of the resistor R49, and the cathode of the three-terminal voltage regulator U8. The other end of the capacitor C5 is respectively connected to one end of the resistor R55, one end of the resistor R20, one end of the resistor R54, one end of the capacitor C8, the reference pole of the three-terminal voltage regulator U8, and one end of the resistor R20. The other end of the capacitor C8 is respectively connected to the other end of the resistor R54 and the other end of the resistor R54, the anode of the three-terminal voltage regulator U8, the negative output terminal of the rectifier bridge BD2, one end of the resistor R53, one end of the resistor R52, one end of the capacitor C10, and the second pin of the primary side of the optocoupler U7; The source of the MOS transistor Q1 is respectively connected to the other end of the resistor R52, the other end of the resistor R53, and the other end of the resistor R55. The drain of the MOS transistor Q1 is respectively connected to one end of the resistor R56 and one end of the resistor R57. The other end of the resistor R56 is respectively connected to the other end of the resistor R57, one end of the resistor R58, one end of the resistor R33, one end of the resistor R8, and the positive output terminal of the rectifier bridge BD2; The other end of the resistor R33 is connected to the other end of the resistor R49. The other end of the resistor R8 is connected to one end of the resistor R17. The other end of the resistor R17 is connected to the other end of the resistor R20. The other end of the resistor R58 is connected to one end of the resistor R59. The other end of the resistor R59 is connected to one end of the resistor RJ1. The other end of the resistor RJ1 is respectively connected to the other end of the capacitor C10 and the first pin of the primary side of the optocoupler U7.

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