Anti-interference driving device and lighting lamp

Abstract

The utility model discloses an anti-interference driving device and a lighting lamp. The device comprises a rectification circuit, an anti-interference circuit, an RC circuit and a constant current driving circuit. The rectifying circuit is connected with an external alternating current power supply and is used for converting alternating current mains supply into direct current; the anti-interference circuit is respectively connected with the rectifying circuit, the RC circuit and the constant-current driving circuit, and is used for carrying out anti-interference processing on the direct current and respectively adaptively supplying power to the RC circuit and the constant-current driving circuit; the RC circuit is connected with the constant current driving circuit and is used for providing holding current for an external silicon controlled rectifier dimmer; the constant current driving circuit is connected with the light source module and used for driving the light source module to work in a constant current mode and adjusting the constant current of the light source module according to the voltage signal output by the silicon controlled rectifier dimmer. According to the utility model, the problems of EMC interference, noise interference and surge can be solved, the whole circuit structure is simple, the cost is low, and the actual requirements of users can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting, and in particular to an anti-interference driving device and a lighting fixture. Background Art

[0002] At present, switching power supplies are widely used in the lighting industry, but they face interference problems, which may cause serious EMC and noise problems. The current industry solution to the anti-interference problem is to add a π-type filter circuit after the rectifier bridge in the drive circuit. However, this can only solve the interference of EMC conduction and radiation, but cannot solve the noise interference. Therefore, in order to solve the noise interference, the industry will make more complicated design processing, such as material improvement and glue filling treatment, etc. These solutions will incur high costs, resulting in a lower cost performance of lighting products, forming sales resistance, and failing to meet the actual needs of users. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an anti-interference driving device and a lighting fixture, which can solve EMC interference, noise interference and surge problems, and the overall circuit structure is simple and low in cost, and can meet the actual needs of users.

[0004] In order to solve the above technical problems, the utility model provides an anti-interference driving device, including a rectifier circuit, an anti-interference circuit, an RC circuit and a constant current driving circuit; the rectifier circuit is connected to an external AC power supply, and is used to convert AC mains power into DC power; the anti-interference circuit is respectively connected to the rectifier circuit, the RC circuit and the constant current driving circuit, and is used to perform anti-interference processing on the DC power and adapt power supply to the RC circuit and the constant current driving circuit respectively; the RC circuit is connected to the constant current driving circuit, and is used to provide a maintaining current for an external thyristor dimmer; the constant current driving circuit is connected to a light source module, and is used to drive the light source module to operate at a constant current and adjust the constant current of the light source module according to the voltage signal output by the thyristor dimmer.

[0005] As an improvement of the above scheme, the anti-interference circuit includes a π-type filter circuit and a sound filter circuit; the π-type filter circuit includes a first capacitor, a second capacitor, a third capacitor and a first inductor, one end of the first inductor is respectively connected to the DC output end of the rectifier circuit, one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is respectively connected to the other end of the second capacitor, one end of the third capacitor and the RC circuit, the other ends of the first capacitor and the third capacitor are both grounded; the sound filter circuit is connected in parallel with the first inductor.

[0006] As an improvement of the above solution, the sound filtering circuit includes a first resistor and a TVS tube, and the first resistor and the TVS tube are both connected in parallel with the first inductor.

[0007] As an improvement of the above scheme, the RC circuit includes a fourth capacitor and a resistance module, one end of the fourth capacitor is respectively connected to the output end of the anti-interference circuit and the input end of the constant current drive circuit, and the other end of the fourth capacitor is grounded via the resistance module.

[0008] As an improvement of the above solution, the resistor module includes at least one resistor.

[0009] As an improvement of the above scheme, the constant current drive circuit includes an output circuit, a constant current drive chip, a switch control circuit, a sampling module, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, an energy storage inductor and a fifth capacitor; the constant current drive chip includes a first differential sampling pin, a second differential sampling pin, a conduction time setting pin, a sampling pin, a drive pin, a power supply pin and a ground pin; the control end of the switch control circuit is connected to the drive pin, the first end of the switch control circuit is grounded through the sampling module, and the second end of the switch control circuit is connected to the RC through the energy storage inductor. The output end of the circuit is connected and connected to the output circuit via the first diode, the first diode is connected in parallel with the second resistor and the fifth capacitor connected in series, and the switch control circuit is used to control the working state of the energy storage inductor; the output circuit is connected in parallel with the energy storage inductor and the light source module respectively, the output circuit is connected to the power supply pin via the third resistor and connected to the first differential sampling pin via the fourth resistor; the sampling pin is grounded via the sampling module, the conduction time setting pin is grounded via the fifth resistor, and the second differential sampling pin is connected to the output end of the anti-interference circuit via the sixth resistor.

[0010] As an improvement of the above scheme, the switch control circuit includes a seventh resistor, an eighth resistor, a second diode and a switch tube; the first end of the switch tube is connected to the drive pin via the seventh resistor and the eighth resistor in sequence, the first end of the switch tube is grounded via a sampling module, the second end of the switch tube is connected to the output end of the RC circuit via the energy storage inductor and connected to the output circuit via the first diode, the control end of the switch tube is respectively connected to the connection end between the seventh resistor and the eighth resistor and the positive end of the second diode, and the negative end of the second diode is connected to the drive pin.

[0011] As an improvement of the above scheme, the output circuit includes a first electrolytic capacitor and a ninth resistor, and the first electrolytic capacitor is respectively connected in parallel with the ninth resistor and the light source module; the positive terminal of the first electrolytic capacitor is respectively connected to one end of the energy storage inductor and the second end of the switch control circuit via the first diode, and the negative terminal of the first electrolytic capacitor is respectively connected to the other end of the energy storage inductor and the output end of the RC circuit.

[0012] As an improvement of the above scheme, the rectifier circuit includes a common-mode inductor, a fuse resistor, a varistor, a rectifier bridge, a tenth resistor, an eleventh resistor and a safety capacitor; the common-mode inductor includes a first winding and a second winding, the first end of the first winding is connected to the live wire end of the power supply via the fuse resistor and is connected to one end of the varistor, the second end of the first winding is connected to the second end of the second winding via the tenth resistor and the eleventh resistor in sequence, the second end of the first winding is respectively connected to one end of the safety capacitor and the first AC input end of the rectifier bridge, the first end of the second winding is respectively connected to the other end of the varistor and the neutral wire end of the power supply; the second AC input end of the rectifier bridge is respectively connected to the other end of the safety capacitor and the second end of the second winding, the ground end of the rectifier bridge is grounded, and the DC output end of the rectifier bridge is connected to the anti-interference circuit.

[0013] The utility model also provides a lighting fixture, comprising a lamp body and the above-mentioned anti-interference driving device, wherein the anti-interference driving device is packaged in the lamp body.

[0014] The beneficial effects of implementing the utility model are:

[0015] The utility model can provide a maintaining current to an externally connected thyristor dimmer through the provided RC circuit, so that the thyristor dimmer maintains a normal working state; the provided anti-interference circuit can play an anti-interference role on the rectified direct current, and solve the EMC interference, noise interference and surge problems; the provided constant current driving circuit can drive the light source module to work at a constant current, and can adjust the constant current of the light source module according to the voltage signal output by the thyristor dimmer to achieve a dimming effect; and the overall circuit structure is simple, the cost is low, and can meet the actual needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the anti-interference driving device of the utility model;

[0017] Figure 2 It is a circuit structure diagram of the anti-interference driving device of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, a specific embodiment of the utility model provides an anti-interference driving device, including a rectifier circuit 1, an anti-interference circuit 2, an RC circuit 3 and a constant current driving circuit 4; the rectifier circuit 1 is connected to an external AC power supply to convert AC mains power into DC power to power the entire circuit.

[0020] The input end of the anti-interference circuit 2 is connected to the DC output end of the rectifier circuit 1, and is used to perform anti-interference processing on the DC power to solve EMC interference, noise interference and surge problems. The output end of the anti-interference circuit 2 is respectively connected to the RC circuit 3 and the constant current drive circuit 4, and is used to adapt the DC power after anti-interference processing to the RC circuit 3 and the constant current drive circuit 4 for power supply. The RC circuit 3 is connected to the constant current drive circuit 4, and is used to provide a maintenance current for the externally connected thyristor dimmer so that the thyristor dimmer maintains a normal working state. The constant current drive circuit 4 is connected to the light source module, and is used to drive the light source module to work at a constant current and adjust the constant current of the light source module according to the voltage signal output by the thyristor dimmer. When the user realizes dimming through an external thyristor dimmer, the constant current drive circuit 4 can adjust the size of the constant current of the light source module according to the different voltage signals of the thyristor dimmer, thereby achieving a dimming effect.

[0021] Therefore, the utility model can provide a maintaining current to the externally connected thyristor dimmer through the RC circuit 3 so that the thyristor dimmer maintains a normal working state; the anti-interference circuit 2 can play an anti-interference role on the rectified DC power to solve EMC interference, noise interference and surge problems; the constant current drive circuit 4 can drive the light source module to operate at a constant current, and can adjust the constant current of the light source module according to the voltage signal output by the thyristor dimmer to achieve a dimming effect; and the overall circuit structure is simple, low cost, and can meet the actual needs of users.

[0022] Preferably, the light source module comprises at least one group of LED modules, and each group of LED modules comprises a plurality of light emitting diodes connected in series.

[0023] The following is a detailed description of the present invention in conjunction with a specific circuit diagram:

[0024] like Figure 2 As shown, Figure 2 The circuit structure diagram of the anti-interference driving device of the utility model is shown, and the rectifier circuit 1, the anti-interference circuit 2, the RC circuit 3 and the constant current driving circuit 4 are described below respectively:

[0025] 1. Rectifier circuit 1

[0026] The rectifier circuit 1 includes a common mode inductor LF1, a fuse resistor FR1, a varistor RV1, a rectifier bridge DB1, a tenth resistor R1, an eleventh resistor R2 and a safety capacitor CX1. The common mode inductor LF1 includes a first winding and a second winding, the first end of the first winding is connected to the live wire terminal L of the power supply via the fuse resistor FR1 and is connected to one end of the varistor RV1, the second end of the first winding is connected to the second end of the second winding via the tenth resistor R1 and the eleventh resistor R2 in sequence, the second end of the first winding is respectively connected to one end of the safety capacitor CX1 and the first AC input end of the rectifier bridge DB1, and the first end of the second winding is respectively connected to the other end of the varistor RV1 and the neutral wire terminal N of the power supply;

[0027] The second AC input end of the rectifier bridge DB1 is connected to the other end of the safety capacitor CX1 and the second end of the second winding respectively, the ground end of the rectifier bridge DB1 is grounded, and the DC output end of the rectifier bridge DB1 is connected to the anti-interference circuit 2. The input AC power is filtered by the common mode inductor LF1 and the safety capacitor CX1, and then rectified by the rectifier bridge DB1 to provide the DC power required for the subsequent circuit to work.

[0028] Preferably, in the case where the actual circuit power is relatively high, the fuse resistor FR1 can be replaced with a fuse tube to meet the actual needs of users.

[0029] Preferably, in other embodiments, other devices with circuit protection functions may be selected to replace the varistor RV1 according to actual needs of users, such as a gas discharge tube or a TVS tube.

[0030] 2. Anti-interference circuit 2

[0031] The anti-interference circuit 2 includes a π-type filter circuit 21 and a sound filter circuit 22; the π-type filter circuit 21 includes a first capacitor C1, a second capacitor C5, a third capacitor C2 and a first inductor L1, one end of the first inductor L1 is respectively connected to the DC output end of the rectifier circuit 1, one end of the first capacitor C1 and one end of the second capacitor C5, the other end of the first inductor L1 is respectively connected to the other end of the second capacitor C5, one end of the third capacitor C2 and the RC circuit 3, the other ends of the first capacitor C1 and the third capacitor C2 are both grounded; the sound filter circuit 22 is connected in parallel with the first inductor L1.

[0032] Furthermore, the sound filtering circuit 22 includes a first resistor R3 and a TVS tube, and the first resistor R3 and the TVS tube are both connected in parallel with the first inductor L1.

[0033] It should be noted that the π-type filter circuit 21 can provide anti-interference to the rectified DC power and solve the EMC interference problem. The sound filter circuit 22 can solve the noise interference problem and surge problem; for example, when the noise peak voltage generated by the first inductor L1 reaches the TVS tube clamping voltage, the TVS tube can absorb the noise signal to achieve the purpose of noise reduction.

[0034] 3. RC circuit 3

[0035] The RC circuit 3 includes a fourth capacitor C3 and a resistor module 31 , one end of the fourth capacitor C3 is respectively connected to the output end of the anti-interference circuit 2 and the input end of the constant current drive circuit 4 , and the other end of the fourth capacitor C3 is grounded via the resistor module 31 .

[0036] Preferably, in this embodiment, the resistor module 31 includes four resistors (such as R11, R12, R13 and R14). The current signal in the DC power is adjusted by the resistor module 31 to increase the holding current. By adjusting the number and resistance of the resistor modules 31, different holding currents can be set to output to ensure the dimming effect of the light source module and improve the dimming compatibility.

[0037] 4. Constant current drive circuit 4

[0038] The constant current drive circuit 4 includes an output circuit 41, a constant current drive chip U1, a switch control circuit 42, a sampling module 43, a second resistor R15, a third resistor R8, a fourth resistor R9, a fifth resistor R7, a sixth resistor R10, a first diode D2, an energy storage inductor T1 and a fifth capacitor C4; the constant current drive chip U1 includes a first differential sampling pin, a second differential sampling pin, a conduction time setting pin, a sampling pin, a drive pin, a power supply pin and a ground pin.

[0039] The control end of the switch control circuit 42 is connected to the driving pin, the first end of the switch control circuit 42 is grounded via the sampling module 43, the second end of the switch control circuit 42 is connected to the output end of the RC circuit 3 via the energy storage inductor T1 and is connected to the output circuit 41 via the first diode D2, the first diode D2 is connected in parallel with the second resistor R15 and the fifth capacitor C4 connected in series, and the switch control circuit 42 is used to control the working state of the energy storage inductor T1; the output circuit 41 is connected in parallel with the energy storage inductor T1 and the light source module respectively, the output circuit 41 is connected to the power supply pin via the third resistor R8 and is connected to the first differential sampling pin via the fourth resistor R9; the sampling pin is grounded via the sampling module 43, the conduction time setting pin is grounded via the fifth resistor, and the second differential sampling pin is connected to the output end of the anti-interference circuit 2 via the sixth resistor R10.

[0040] Among them, the sampling module 43 includes a first sampling resistor RS1 and a second sampling resistor RS1. The constant current driver chip U1 can set the output constant current value by connecting the sampling module 43 to the sampling pin, which is highly flexible. At the same time, the constant current driver chip U1 can control the on or off of the switch control circuit 42 to control the working state of the energy storage inductor T1, such as controlling the energy storage inductor T1 to store energy or discharge energy to provide energy to the light source module.

[0041] Preferably, the constant current driving chip U1 is preferably BP3288, but is not limited thereto and can be adjusted according to actual needs.

[0042] Specifically, the output circuit 41 includes a first electrolytic capacitor EC1 and a ninth resistor R16, and the first electrolytic capacitor EC1 is connected in parallel with the ninth resistor R16 and the light source module. The positive terminal of the first electrolytic capacitor EC1 is connected to one end of the energy storage inductor T1 and the second end of the switch control circuit 42 via the first diode D2, and the negative terminal of the first electrolytic capacitor EC1 is connected to the other end of the energy storage inductor T1 and the output end of the RC circuit 3. The output circuit 41 is provided to provide stable direct current to the light source module, thereby improving the stability of lighting work.

[0043] Secondly, the switch control circuit 42 includes a seventh resistor R6, an eighth resistor R4, a second diode D1 and a switch tube Q1; the first end of the switch tube Q1 is connected to the drive pin via the seventh resistor R6 and the eighth resistor R4 in sequence, the first end of the switch tube Q1 is grounded via the sampling module 43, the second end of the switch tube Q1 is connected to the output end of the RC circuit 3 via the energy storage inductor T1 and is connected to the output circuit 41 via the first diode D2, the control end of the switch tube Q1 is respectively connected to the connection end between the seventh resistor R6 and the eighth resistor R4 and the positive end of the second diode D1, and the negative end of the second diode D1 is connected to the drive pin.

[0044] It should be noted that the constant current driver chip U1 drives the switch tube Q1 to turn on and off through the drive pin, so as to control the energy storage inductor T1 to store and discharge energy to provide energy to the light source module. For example, when the switch tube Q1 is turned on, the current flowing through the energy storage inductor T1 starts to rise from zero to store energy; when the switch tube Q1 is turned off, the current flowing through the energy storage inductor T1 decreases to achieve discharge.

[0045] Preferably, the switch tube Q1 is an NMOS tube.

[0046] Preferably, the utility model further provides a lighting fixture, comprising a lamp body and the above-mentioned anti-interference driving device, wherein the anti-interference driving device is encapsulated in the lamp body. Since the above-mentioned anti-interference driving device has the above-mentioned technical effects, the lighting fixture comprising the above-mentioned anti-interference driving device should also have the above-mentioned technical effects, which will not be described in detail here.

[0047] The above is a preferred embodiment of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present utility model.

Claims

1. An anti-interference driving device, characterized in that: Including rectification circuit, anti-interference circuit, RC circuit and constant current drive circuit; The rectifier circuit is connected to an external AC power source and is used to convert AC mains power into DC power; The anti-interference circuit is connected to the rectifier circuit, the RC circuit and the constant current drive circuit respectively, and is used to perform anti-interference processing on the direct current and adapt power supply to the RC circuit and the constant current drive circuit respectively; The RC circuit is connected to the constant current driving circuit and is used to provide a holding current for an external thyristor dimmer; The constant current driving circuit is connected to the light source module, and is used to drive the light source module to operate at a constant current and adjust the constant current of the light source module according to the voltage signal output by the thyristor dimmer.

2. The anti-interference driving device according to claim 1, characterized in that: The anti-interference circuit includes a π-type filter circuit and a sound filter circuit; The π-type filter circuit comprises a first capacitor, a second capacitor, a third capacitor and a first inductor, one end of the first inductor is respectively connected to the DC output end of the rectifier circuit, one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is respectively connected to the other end of the second capacitor, one end of the third capacitor and an RC circuit, and the other ends of the first capacitor and the third capacitor are both grounded; The sound filtering circuit is connected in parallel with the first inductor.

3. The anti-interference driving device according to claim 2, characterized in that: The sound filtering circuit includes a first resistor and a TVS tube, and the first resistor and the TVS tube are both connected in parallel with the first inductor.

4. The anti-interference driving device according to claim 1, characterized in that: The RC circuit includes a fourth capacitor and a resistance module, one end of the fourth capacitor is respectively connected to the output end of the anti-interference circuit and the input end of the constant current drive circuit, and the other end of the fourth capacitor is grounded via the resistance module.

5. The anti-interference driving device according to claim 4, characterized in that: The resistor module includes at least one resistor.

6. The anti-interference driving device according to claim 1, characterized in that: The constant current drive circuit includes an output circuit, a constant current drive chip, a switch control circuit, a sampling module, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, an energy storage inductor and a fifth capacitor; The constant current drive chip includes a first differential sampling pin, a second differential sampling pin, a conduction time setting pin, a sampling pin, a drive pin, a power supply pin and a ground pin; The control end of the switch control circuit is connected to the driving pin, the first end of the switch control circuit is grounded via the sampling module, the second end of the switch control circuit is connected to the output end of the RC circuit via the energy storage inductor and connected to the output circuit via the first diode, the first diode is connected in parallel with the second resistor and the fifth capacitor connected in series, and the switch control circuit is used to control the working state of the energy storage inductor; The output circuit is connected in parallel with the energy storage inductor and the light source module respectively, and the output circuit is connected to the power supply pin via the third resistor and is connected to the first differential sampling pin via the fourth resistor; The sampling pin is grounded via the sampling module, the on-time setting pin is grounded via the fifth resistor, and the second differential sampling pin is connected to the output end of the anti-interference circuit via the sixth resistor.

7. The anti-interference driving device according to claim 6, characterized in that: The switch control circuit includes a seventh resistor, an eighth resistor, a second diode and a switch tube; The first end of the switch tube is connected to the drive pin via the seventh resistor and the eighth resistor in sequence, the first end of the switch tube is grounded via the sampling module, the second end of the switch tube is connected to the output end of the RC circuit via the energy storage inductor and is connected to the output circuit via the first diode, the control end of the switch tube is respectively connected to the connection end between the seventh resistor and the eighth resistor and the positive end of the second diode, and the negative end of the second diode is connected to the drive pin.

8. The anti-interference driving device according to claim 6, characterized in that: The output circuit comprises a first electrolytic capacitor and a ninth resistor, wherein the first electrolytic capacitor is connected in parallel with the ninth resistor and the light source module respectively; The positive terminal of the first electrolytic capacitor is connected to one end of the energy storage inductor and the second end of the switch control circuit respectively through the first diode, and the negative terminal of the first electrolytic capacitor is connected to the other end of the energy storage inductor and the output end of the RC circuit respectively.

9. The anti-interference driving device according to claim 1, characterized in that: The rectifier circuit includes a common mode inductor, a fuse resistor, a varistor, a rectifier bridge, a tenth resistor, an eleventh resistor and a safety capacitor; The common-mode inductor comprises a first winding and a second winding, wherein the first end of the first winding is connected to the live wire end of the power supply via the insurance resistor and is connected to one end of the varistor, the second end of the first winding is connected to the second end of the second winding via the tenth resistor and the eleventh resistor in sequence, the second end of the first winding is respectively connected to one end of the safety capacitor and the first AC input end of the rectifier bridge, and the first end of the second winding is respectively connected to the other end of the varistor and the neutral wire end of the power supply; The second AC input end of the rectifier bridge is respectively connected to the other end of the safety capacitor and the second end of the second winding, the grounding end of the rectifier bridge is grounded, and the DC output end of the rectifier bridge is connected to the anti-interference circuit.

10. A lighting fixture, characterized in that: The invention comprises a lamp body and an anti-interference driving device according to any one of claims 1 to 9, wherein the anti-interference driving device is packaged in the lamp body.

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