Silicon controlled rectifier dimming power supply circuit and lamp

Abstract

The utility model discloses a silicon controlled rectifier dimming power supply circuit and a lamp, which relate to the technical field of illumination and comprise a rectification filter circuit, a secondary filter circuit, a compatible circuit, a voltage stabilizing circuit, a drive control circuit and an output circuit. The rectifying and filtering circuit is used for filtering and rectifying the alternating current so as to convert the alternating current into direct current; the secondary filter circuit is used for filtering the direct current and adaptively supplying power to the compatible circuit, the voltage stabilizing circuit, the driving control circuit and the output circuit; the compatible circuit is used for adjusting the working state of an external silicon controlled dimmer; the voltage stabilizing circuit is used for providing holding current for an external silicon controlled dimmer; and the driving control circuit is connected with the output circuit and is used for adjusting the state of the output circuit according to a control signal of an external silicon controlled dimmer, so that the output circuit supplies power to a load. According to the utility model, the light modulation compatibility of the silicon controlled rectifier light modulator can be effectively improved through the compatible circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting, in particular to a thyristor dimming power supply circuit and a lamp. Background Art

[0002] Thyristor dimming is a commonly used dimming technology in the lighting industry, which can improve the flexibility and comfort of lighting equipment. Its principle is to change the size of the thyristor conduction angle to adjust the output voltage of the dimmer, thereby changing the brightness of the LED.

[0003] At present, there are generally problems with dimming compatibility in thyristor products on the market. Especially when the product power is larger, it is more difficult to achieve good dimming compatibility while also being compatible with power supply temperature rise, efficiency, etc. Therefore, dimming compatibility has always troubled the application of thyristor dimming products. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a thyristor dimming power supply circuit and a lamp, which can effectively improve the dimming compatibility of the thyristor dimmer.

[0005] To solve the above technical problem, the utility model provides a thyristor dimming power supply circuit, including a rectifier filter circuit, a secondary filter circuit, a compatibility circuit, a voltage stabilizing circuit, a drive control circuit and an output circuit; the rectifier filter circuit is used for filtering and rectifying alternating current to convert it into direct current; the secondary filter circuit is respectively connected to the rectifier filter circuit, the compatibility circuit, the voltage stabilizing circuit, the drive control circuit and the output circuit, and is used for filtering the direct current and respectively supplying power to the compatibility circuit, the voltage stabilizing circuit, the drive control circuit and the output circuit; the compatibility circuit is used for adjusting the working state of an externally connected thyristor dimmer; the voltage stabilizing circuit is used for providing a holding current for the externally connected thyristor dimmer; the drive control circuit is connected to the output circuit and is used for adjusting the state of the output circuit according to the control signal of the externally connected thyristor dimmer so that the output circuit supplies power to the load.

[0006] As an improvement of the above solution, the compatibility circuit includes an RC module, a first resistor group, a second resistor group, a zener diode and a second MOS transistor; the source electrode of the second MOS transistor is connected to the rectifier filter circuit and the positive electrode of the zener diode, the gate electrode of the second MOS transistor is connected to the negative electrode of the zener diode, and the drain electrode of the second MOS transistor is grounded; the RC module is connected in parallel with the zener diode, one end of the first resistor group is connected to the negative electrode of the zener diode, the other end of the first resistor group is connected to the output end of the secondary filter circuit, one end of the second resistor group is connected to the rectifier filter circuit, and the other end of the second resistor group is grounded.

[0007] As an improvement to the above solution, the first resistor group includes at least two resistors connected in series, and / or the second resistor group includes at least two resistors connected in series.

[0008] As an improvement to the above solution, the drive control circuit includes a drive chip, a first MOS transistor, a MOS transistor drive control module, a current sampling module, a setting module, and a voltage regulation module; the drive chip is provided with a drive output terminal, a current sampling terminal, a conduction time setting terminal, and a high-voltage power supply input terminal; the drive output terminal is connected to the first MOS transistor through the MOS transistor drive control module and is connected to the output circuit through the first MOS transistor, the current sampling terminal is connected to the MOS transistor drive control module and is grounded through the current sampling module, the conduction time setting terminal is grounded through the setting module, and the high-voltage power supply input terminal is connected to the output circuit through the voltage regulation module.

[0009] As an improvement to the above solution, the MOS transistor drive control module includes a first diode, a fourth resistor, a fifth resistor, and a sixth resistor; the positive electrode of the first diode is respectively connected to one end of the fourth resistor, the fifth resistor, and the sixth resistor, the negative electrode of the first diode is connected to the drive output terminal and the other end of the fourth resistor, the other end of the fifth resistor is connected to the gate of the first MOS transistor, the other end of the sixth resistor is respectively connected to the current sampling terminal and the source of the first MOS transistor, and the drain of the first MOS transistor is connected to the output circuit.

[0010] As an improvement to the above solution, the drive control circuit further includes a first protection module and a second protection module, and the drive chip is further provided with a differential sampling positive terminal and a differential sampling negative terminal; the differential sampling positive terminal is connected to the output circuit through the first protection module, and the differential sampling negative terminal is connected to the output terminal of the secondary filtering circuit through the second protection module.

[0011] As an improvement to the above solution, the output circuit includes a storage inductor, a first electrolytic capacitor, a second electrolytic capacitor, a fifteenth resistor, and a second diode; one end of the storage inductor, the negative electrode of the first electrolytic capacitor, the negative electrode of the second electrolytic capacitor, and one end of the fifteenth resistor are connected to the output terminal of the secondary filtering circuit, the other end of the storage inductor is respectively connected to the positive electrode of the second diode and the drive control circuit, and the positive electrode of the first electrolytic capacitor, the positive electrode of the second electrolytic capacitor, and the other end of the fifteenth resistor are respectively connected to the negative electrode of the second diode and the drive control circuit.

[0012] As an improvement of the above solution, the secondary filtering circuit includes an inductor, a third resistor, a first capacitor and a second capacitor. One end of the inductor is connected to the output end of the rectifying and filtering circuit and grounded through the first capacitor. The other end of the inductor is connected to the compatibility circuit, the voltage stabilizing circuit, the drive control circuit and the output circuit and grounded through the second capacitor. The third resistor is connected in parallel with the inductor.

[0013] Correspondingly, the present invention also provides a lamp, which includes a lamp body, a load, a PCB board and the above thyristor dimming power supply circuit. The load is connected to the output circuit of the thyristor dimming power supply circuit. The load and the thyristor dimming power supply circuit are encapsulated in the lamp body through the PCB board.

[0014] As an improvement of the above solution, the components of the load and the thyristor dimming power supply circuit are arranged on the PCB board by means of surface mounting and / or plugging.

[0015] The beneficial effects of implementing the present invention are as follows:

[0016] By setting a compatibility circuit and adjusting the parameters of the electrical components in the compatibility circuit, the present invention can effectively improve the dimming compatibility of the thyristor dimmer, and at the same time ensure good temperature rise and product energy efficiency.

[0017] By setting a rectifying and filtering circuit and a secondary filtering circuit to implement multi-stage filtering processing of the current, the present invention can effectively solve the problems of EMC interference, noise interference and surge.

[0018] By setting a voltage stabilizing circuit to provide a holding current for the externally connected thyristor dimmer, the present invention enables the thyristor dimmer to maintain a normal working state.

[0019] By setting a drive control circuit, the present invention enables the drive control circuit to control the energy storage and discharge of the output circuit according to the control signal of the externally connected thyristor dimmer, so as to adjust the constant current of the light source module to provide energy for the load and achieve the dimming effect. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the thyristor dimming power supply circuit of the present invention;

[0021] Figure 2 It is a circuit diagram of the thyristor dimming power supply circuit of the present invention. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the orientation terms such as above, below, left, right, front, back, inside, and outside that appear or will appear in the text of the present utility model are only based on the drawings of the present utility model and do not specifically limit the present utility model.

[0023] See Figure 1 , Figure 1 which shows the specific structure of the thyristor dimming power supply circuit of the present utility model, including a rectifier filter circuit 1, a secondary filter circuit 2, a compatibility circuit 3, a voltage stabilizing circuit 4, a drive control circuit 5, and an output circuit 6. Specifically:

[0024] The rectifier filter circuit 1 is connected to the external alternating current and is used to filter and rectify the alternating current to convert it into direct current to supply power to the entire circuit.

[0025] The input end of the secondary filter circuit 2 is connected to the output end of the rectifier filter circuit 1, and the output end of the secondary filter circuit 2 is respectively connected to the compatibility circuit 3, the voltage stabilizing circuit 4, the drive control circuit 5, and the output circuit 6; the secondary filter circuit 2 is used to filter the direct current and adaptively supply power to the compatibility circuit 3, the voltage stabilizing circuit 4, the drive control circuit 5, and the output circuit 6 respectively.

[0026] The compatibility circuit 3 is used to adjust the working state of the externally connected thyristor dimmer.

[0027] The voltage stabilizing circuit 4 is used to provide a holding current for the externally connected thyristor dimmer to maintain the normal working state of the thyristor dimmer.

[0028] The drive control circuit 5 is connected to the output circuit 6 and is used to adjust the state of the output circuit 6 according to the control signal of the externally connected thyristor dimmer so that the output circuit 6 supplies power to the load; when the user realizes dimming through the externally connected thyristor dimmer, the drive control circuit 5 can adjust the magnitude of the current output by the output circuit 6 to the load according to the control signal (such as a voltage signal) of the thyristor dimmer, thereby achieving the dimming effect.

[0029] Therefore, the present utility model effectively improves the dimming compatibility of the thyristor dimmer by introducing the compatibility circuit 3 and adjusting the parameters of the electrical components in the compatibility circuit 3, and can ensure good temperature rise and product energy efficiency at the same time. Moreover, the overall circuit structure is simple, the cost is low, and it can meet the actual needs of users.

[0030] Preferably, the load includes at least one group of LED modules, and each group of LED modules includes a plurality of light-emitting diodes connected in series.

[0031] Next, in combination with Figure 2, the rectifier filter circuit 1, the secondary filter circuit 2, the compatibility circuit 3, the voltage regulator circuit 4, the drive control circuit 5, and the output circuit 6 will be described in detail as follows:

[0032] I. Rectifier Filter Circuit 1

[0033] The rectifier filter circuit 1 includes a common mode inductor LF1, a fuse resistor F1, a varistor RV1, a rectifier bridge DB1, a first resistor R1, a second resistor R2, and a safety capacitor CX1.

[0034] The common mode inductor LF1 includes a first winding and a second winding. The first end of the first winding is connected to the power line terminal L of the power supply through the fuse resistor F1 and is connected to one end of the varistor RV1. The second end of the first winding is sequentially connected to the second end of the second winding through the second resistor R1 and the first resistor R1. The second end of the first winding is respectively connected to one end of the safety capacitor CX1 and the first AC input terminal of the rectifier bridge DB1. The first end of the second winding is respectively connected to the other end of the varistor RV1 and the power neutral line terminal N.

[0035] The second AC input terminal of the rectifier bridge DB1 is respectively connected to the other end of the safety capacitor CX1 and the second end of the second winding. The grounding terminal of the rectifier bridge DB1 is connected to the compatibility circuit 3, and the DC output terminal of the rectifier bridge DB1 is connected to the secondary filter circuit 2.

[0036] Alternating current is input from the power line terminal L and the power neutral line terminal N of the power supply. After being filtered by the common mode inductor LF1 and the safety capacitor CX1, it is rectified by the rectifier bridge BD1 to provide direct current for the subsequent circuit, realizing the conversion of alternating current to direct current. At the same time, the first resistor R1 and the second resistor R2 discharge the safety capacitor CX1.

[0037] Preferably, in the case of a relatively high actual circuit power, the fuse resistor F1 can be replaced with a fuse tube to meet the actual needs of users.

[0038] Correspondingly, in other embodiments, other devices with circuit protection functions can be selected to replace the varistor RV1 according to the actual needs of users, such as gas discharge tubes or TVS tubes, etc.

[0039] II. Secondary Filter Circuit 2

[0040] The secondary filter circuit 2 includes an inductor L1, a third resistor R3, a first capacitor C1, and a second capacitor C2. One end of the inductor L1 is connected to the output terminal of the rectifier filter circuit 1 and is grounded through the first capacitor C1. The other end of the inductor L1 is connected to the compatibility circuit 3, the voltage regulator circuit 4, the drive control circuit 5, and the output circuit 6 and is grounded through the second capacitor C2. The third resistor R3 is connected in parallel with the inductor L1.

[0041] Therefore, the rectified direct current can be processed by the secondary filtering circuit 2 to filter out circuit interference.

[0042] III. Compatibility Circuit 3

[0043] The compatibility circuit 3 includes an RC module, a first resistor group, a second resistor group, a voltage stabilizing diode ZD2, and a second MOS transistor Q2; the source electrode of the second MOS transistor Q2 is connected to the rectifying and filtering circuit 1 and the positive electrode of the voltage stabilizing diode ZD2, the gate electrode of the second MOS transistor Q2 is connected to the negative electrode of the voltage stabilizing diode ZD2, and the drain electrode of the second MOS transistor Q2 is grounded; the RC module is connected in parallel with the voltage stabilizing diode ZD2, one end of the first resistor group is connected to the negative electrode of the voltage stabilizing diode ZD2, the other end of the first resistor group is connected to the output end of the secondary filtering circuit 2, one end of the second resistor group is connected to the rectifying and filtering circuit 1, and the other end of the second resistor group is grounded.

[0044] It should be noted that the second resistor group can effectively suppress factors such as the oscillation current and impact current when the thyristor is conducting, which are not conducive to the operation of the thyristor dimmer; at the same time, by adjusting the parameters of the RC module, the first resistor group, the second resistor group, and the voltage stabilizing diode ZD2, the conduction condition of the second MOS transistor Q2 can be adjusted, reducing the loss of the second resistor group in the circuit, while achieving the desired dimming effect. Therefore, the compatibility circuit 3 can effectively improve the dimming compatibility of the thyristor dimmer, and at the same time ensure better temperature rise and product energy efficiency.

[0045] Correspondingly, the first resistor group includes one resistor or at least two resistors connected in series, and / or the second resistor group includes at least two resistors connected in series. Preferably, the RC module includes an eighteenth resistor R18 and a fourth capacitor C4 connected in parallel with each other, the first resistor group includes a sixteenth resistor R16 and a seventeenth resistor R17 connected in series, and the second resistor group includes a nineteenth resistor R19 and a twentieth resistor R20 connected in series.

[0046] For example, for a 32W ceiling lamp product, the following parameters can be adopted: the sixteenth resistor R16 is 510K, the seventeenth resistor R17 is 510K, the eleventh resistor R11 is 100K, the fourth capacitor C4 is 10nf / 50V, the voltage stabilizing diode ZD2 is 15V, the nineteenth resistor R19 is 68Ω, the eighteenth resistor R18 is 68Ω, and the second MOS transistor Q2 is 4A / 650V. After overall matching, good dimming compatibility and power efficiency can be achieved.

[0047] IV. Voltage Stabilizing Circuit 4

[0048] The voltage stabilizing circuit 4 includes a third capacitor C3 and a third resistor group. One end of the third capacitor C3 is respectively connected to the output end of the secondary filtering circuit 2 and the input end of the output circuit 6, and the other end of the third capacitor C3 is grounded through the third resistor group.

[0049] Preferably, in this embodiment, the third resistor group includes four parallel resistors (such as R11, R12, R13, and R14). Different sustain currents can be set by adjusting the number and resistance value of the third resistor group.

[0050] V. Drive control circuit 5

[0051] The drive control circuit 5 includes a drive chip U1, a first MOS transistor Q1, a MOS transistor drive control module 51, a current sampling module 52, a setting module 53, and a voltage regulation module 54;

[0052] The drive chip U1 is provided with a drive output terminal GATE, a current sampling terminal CS, a conduction time setting terminal Tonmax, and a high-voltage power supply input terminal HV; among them, the drive output terminal GATE is connected to the first MOS transistor Q1 through the MOS transistor drive control module 51 and is connected to the output circuit 6 through the first MOS transistor Q1, the current sampling terminal CS is connected to the MOS transistor drive control module 51 and is grounded through the current sampling module 52, the conduction time setting terminal Tonmax is grounded through the setting module 53, and the high-voltage power supply input terminal HV is connected to the output circuit 6 through the voltage regulation module 54.

[0053] During operation, the drive chip U1 drives the conduction and turn-off of the first MOS transistor Q1, and the MOS transistor drive control module 51 stores energy and discharges the output circuit 6, thereby providing energy to the load; at the same time, the current sampling terminal CS in the drive chip U1 realizes a constant current output through the current feedback detected by the current sampling module 52, with strong flexibility.

[0054] In this embodiment, the current sampling module 52 includes three parallel resistors (RS1, RS2, RS3), the setting module 53 includes a seventh resistor R7, the voltage regulation module 54 includes an eighth resistor R8, and the drive chip U1 is preferably a BP3288 chip, but is not limited thereto and can be selected according to actual situations.

[0055] Correspondingly, the MOS transistor drive control module 51 includes a first diode D1, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; among them, the positive electrode of the first diode D1 is respectively connected to one end of the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6, the negative electrode of the first diode D1 is connected to the drive output terminal GATE and the other end of the fourth resistor R4, the other end of the fifth resistor R5 is connected to the gate of the first MOS transistor Q1, the other end of the sixth resistor R6 is connected to the current sampling terminal CS and the source of the first MOS transistor Q1, and the drain of the first MOS transistor Q1 is connected to the output circuit 6.

[0056] Further, the drive control circuit 5 further includes a first protection module 55 and a second protection module 56. The drive chip U1 is also provided with a differential sampling positive terminal OVP and a differential sampling negative terminal VS. The differential sampling positive terminal OVP is connected to the output circuit 6 through the first protection module 55, and the differential sampling negative terminal VS is connected to the output terminal of the secondary filter circuit 2 through the second protection module 56.

[0057] It should be noted that the first protection module 55 and the second protection module 56 can form an open-circuit OVP protection setting network, and the open-circuit voltage can be set by changing the resistance values of the first protection module 55 and the second protection module 56. Among them, the first protection module 55 is preferably the ninth resistor, and the second protection module 56 is preferably the tenth resistor.

[0058] VI. Output Circuit 6

[0059] The output circuit 6 includes a storage inductor T1, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, a fifteenth resistor R15, and a second diode D2. One end of the storage inductor T1, the negative electrode of the first electrolytic capacitor EC1, the negative electrode of the second electrolytic capacitor EC2, and one end of the fifteenth resistor R15 are connected to the output terminal of the secondary filter circuit 2. The other end of the storage inductor T1 is respectively connected to the positive electrode of the second diode D2 and the drive control circuit 5. The positive electrodes of the first electrolytic capacitor EC1, the second electrolytic capacitor EC2, and the other end of the fifteenth resistor R15 are respectively connected to the negative electrode of the second diode D2 and the drive control circuit 5.

[0060] It should be noted that the drive chip U1 drives the conduction and turn-off of the first MOS transistor Q1. The MOS transistor drive control module 51 can store and discharge the storage inductor T1, so that a stable direct current can be provided to the load through the output circuit 6, improving the stability of the lighting operation.

[0061] For example, when the first MOS transistor Q1 is turned on, the current flowing through the storage inductor T1 rises from zero to store energy. When the first MOS transistor Q1 is turned off, the current flowing through the storage inductor T1 decreases to achieve the discharge operation.

[0062] As can be seen from the above, the present invention adopts a non-isolated buck-boost topology to implement the drive design for use by the load. At the same time, the user can adjust the parameters of the components (such as the fourth capacitor C4, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, and the zener diode ZD2 in the compatibility circuit 3) according to the actual situation to solve the problem of improving the dimming compatibility of the thyristor dimming product.

[0063] Accordingly, the present utility model also discloses a lighting fixture, which comprises a lamp body, a load, a PCB board and the above-mentioned thyristor dimming power supply circuit. The load is connected to the output circuit 6 of the thyristor dimming power supply circuit, and the load and the thyristor dimming power supply circuit are encapsulated in the lamp body through the PCB board.

[0064] Furthermore, the components of the load and the thyristor dimming power supply circuit are arranged on the PCB board by means of surface mounting and / or plugging.

[0065] Therefore, the present utility model is convenient to install. The components can be directly surface-mounted or plugged onto the PCB board, and it does not affect the energy efficiency, safety regulations, etc. of driving the entire system.

[0066] The above is the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present utility model.

Claims

1. A thyristor dimming power supply circuit, characterized in that, It includes a rectifying and filtering circuit, a secondary filtering circuit, a compatibility circuit, a voltage stabilizing circuit, a drive control circuit and an output circuit; The rectifying and filtering circuit is used to filter and rectify alternating current to convert it into direct current; The secondary filtering circuit is respectively connected to the rectifying and filtering circuit, the compatibility circuit, the voltage stabilizing circuit, the drive control circuit and the output circuit, and is used to filter the direct current and adaptively supply power to the compatibility circuit, the voltage stabilizing circuit, the drive control circuit and the output circuit respectively; The compatibility circuit is used to adjust the working state of an externally connected thyristor dimmer; The voltage stabilizing circuit is used to provide a holding current for an externally connected thyristor dimmer; The drive control circuit is connected to the output circuit and is used to adjust the state of the output circuit according to the control signal of an externally connected thyristor dimmer so that the output circuit supplies power to a load.

2. The thyristor dimming power supply circuit according to claim 1, characterized in that, The compatibility circuit includes an RC module, a first resistor group, a second resistor group, a zener diode and a second MOS transistor; The source of the second MOS transistor is connected to the rectifying and filtering circuit and the positive electrode of the zener diode, the gate of the second MOS transistor is connected to the negative electrode of the zener diode, and the drain of the second MOS transistor is grounded; The RC module is connected in parallel with the zener diode, one end of the first resistor group is connected to the negative electrode of the zener diode, the other end of the first resistor group is connected to the output end of the secondary filtering circuit, one end of the second resistor group is connected to the rectifying and filtering circuit, and the other end of the second resistor group is grounded.

3. The thyristor dimming power supply circuit according to claim 2, characterized in that, The first resistor group includes at least two resistors connected in series, and / or the second resistor group includes at least two resistors connected in series.

4. The thyristor dimming power supply circuit according to claim 1, characterized in that, The drive control circuit includes a drive chip, a first MOS transistor, a MOS transistor drive control module, a current sampling module, a setting module and a voltage regulating module; The drive chip is provided with a drive output terminal, a current sampling terminal, a conduction time setting terminal and a high-voltage power supply input terminal; The drive output terminal is connected to the first MOS transistor through the MOS transistor drive control module and is connected to the output circuit through the first MOS transistor, the current sampling terminal is connected to the MOS transistor drive control module and is grounded through the current sampling module, the conduction time setting terminal is grounded through the setting module, and the high-voltage power supply input terminal is connected to the output circuit through the voltage regulating module.

5. The thyristor dimming power supply circuit according to claim 4, characterized in that, The MOS transistor drive control module includes a first diode, a fourth resistor, a fifth resistor and a sixth resistor; The positive electrode of the first diode is respectively connected to one ends of the fourth resistor, the fifth resistor and the sixth resistor, the negative electrode of the first diode is connected to the drive output terminal and the other end of the fourth resistor, the other end of the fifth resistor is connected to the gate of the first MOS transistor, the other end of the sixth resistor is respectively connected to the current sampling terminal and the source of the first MOS transistor, and the drain of the first MOS transistor is connected to the output circuit.

6. The thyristor dimming power supply circuit according to claim 4, characterized in that, The drive control circuit further includes a first protection module and a second protection module, and the drive chip is further provided with a differential sampling positive terminal and a differential sampling negative terminal; The positive terminal of the differential sampling is connected to the output circuit through the first protection module, and the negative terminal of the differential sampling is connected to the output terminal of the secondary filtering circuit through the second protection module.

7. The thyristor dimming power supply circuit according to claim 1, characterized in that, The output circuit includes a storage inductor, a first electrolytic capacitor, a second electrolytic capacitor, a fifteenth resistor, and a second diode; One end of the storage inductor, the negative electrode of the first electrolytic capacitor, the negative electrode of the second electrolytic capacitor, and one end of the fifteenth resistor are connected to the output terminal of the secondary filtering circuit. The other end of the storage inductor is respectively connected to the positive electrode of the second diode and the drive control circuit. The positive electrodes of the first electrolytic capacitor, the second electrolytic capacitor, and the other end of the fifteenth resistor are respectively connected to the negative electrode of the second diode and the drive control circuit.

8. The thyristor dimming power supply circuit according to claim 1, characterized in that, The secondary filtering circuit includes an inductor, a third resistor, a first capacitor, and a second capacitor. One end of the inductor is connected to the output terminal of the rectifying and filtering circuit and grounded through the first capacitor. The other end of the inductor is connected to the compatibility circuit, the voltage stabilizing circuit, the drive control circuit, and the output circuit and grounded through the second capacitor. The third resistor is connected in parallel with the inductor.

9. A lighting fixture, characterized in that, It includes a lamp body, a load, a PCB board, and the thyristor dimming power supply circuit according to any one of claims 1 to 8. The load is connected to the output circuit of the thyristor dimming power supply circuit. The load and the thyristor dimming power supply circuit are encapsulated in the lamp body through the PCB board.

10. The luminaire according to claim 9, characterized in that, The components of the load and the thyristor dimming power supply circuit are arranged on the PCB board by means of surface mounting and / or plugging.

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