Common-mode and differential-mode integrated filter circuit capable of eliminating noise of LED lamp

Abstract

The utility model discloses a common-mode and differential-mode integrated filter circuit capable of eliminating noise of an LED lamp, which comprises a common-mode and differential-mode inductor LF1, the input end of the common-mode and differential-mode inductor LF1 is respectively connected with a zero line N and a live line L, the input end of the common-mode and differential-mode inductor LF1 is connected in parallel with a capacitor CX1, the output end of the common-mode and differential-mode inductor LF1 is connected in parallel with a capacitor CB1, and the output end of the common-mode and differential-mode inductor LF1 is connected in parallel with a capacitor CB1. One output end of the common-differential mode inductor LF1 is a VBUS + signal end, the other output end of the common-differential mode inductor LF1 is a VBUS-signal end, and the rectifier bridge is connected to the input end or the output end of the common-differential mode inductor LF1. The filter circuit is composed of the capacitor CX1, the common-mode and differential-mode inductor LF1, the capacitor CB1 and the rectifier bridge, common-mode interference and differential-mode interference can be suppressed at the same time, and the filter circuit has the advantages of being low in circuit cost and good in noise elimination effect. According to the utility model, through the arrangement of the rectifier bridge, the voltage is smoother and more stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of filter circuits, and in particular relates to a common-differential mode integrated filter circuit capable of eliminating noise of LED lamps. Background Art

[0002] With the development of the LED lighting industry, the requirements for lamp driver performance are becoming increasingly higher, especially in indoor lighting applications, such as underground parking lots, indoor storage rooms, personal bedrooms or hospitals, which have special requirements for lamp noise. The lamp drivers in these occasions are driven by ordinary filtering circuits, especially when used in structures with metal casings. The filter inductor in the driver often resonates with the metal casing, resulting in a poor customer experience. The noise also affects the mood over time, greatly reducing the user experience.

[0003] However, in the existing filtering circuit, the front stage requires common-mode inductor filtering, and the rear stage requires differential-mode inductor filtering. Moreover, a single differential-mode inductor in the rear stage is prone to generate noise. Therefore, there are problems of high cost of the filtering circuit and poor noise elimination effect. Utility Model Content

[0004] The purpose of this utility model is to provide a common-differential mode integrated filter circuit that can eliminate noise from LED lamps, so as to solve the problems raised in the above background technology. The utility model provides a common-differential mode integrated filter circuit that can eliminate noise from LED lamps, which has the characteristics of low cost and good noise elimination effect.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a common-differential mode integrated filter circuit capable of eliminating noise from LED lamps, comprising a common-differential mode inductor LF1, the input end of the common-differential mode inductor LF1 being connected to the neutral line N and the live line L respectively, and a capacitor CX1 being connected in parallel to the input end of the common-differential mode inductor LF1, a capacitor CB1 being connected in parallel to the output end of the common-differential mode inductor LF1, and one output end of the common-differential mode inductor LF1 being a VBUS+ signal end, and the other output end of the common-differential mode inductor LF1 being a VBUS- signal end, and also comprising a rectifier bridge connected to the input end or the output end of the common-differential mode inductor LF1.

[0006] In order to make the voltage smoother and more stable, the rectifier bridge further includes a diode BD1, a diode BD2, a diode BD3 and a diode BD4 connected in sequence end to end.

[0007] In order to prevent the circuit from being overloaded and short-circuited, a fuse F1 is further connected in series between the input end of the common-differential mode inductor LF1 and the live wire L.

[0008] To ensure that the common-mode inductor LF1 not only suppresses common-mode interference but also differential-mode interference, the common-mode inductor LF1 further comprises a frame, a magnetic core disposed within the frame, a coil wound around the frame, and a slot disposed at the top of the frame, within which a magnetic conductive block is disposed. There are two slots, with the magnetic conductive block disposed in the slot closest to the magnetic core. The magnetic conductive block is composed of a plurality of stacked magnetic conductive sheets. The magnetic core is a U-shaped structure, with two cores provided, forming a U-shaped structure. Elastic clips are provided on the exterior of the two cores.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] 1. The utility model is composed of a capacitor CX1, a common-differential mode inductor LF1, a capacitor CB1 and a rectifier bridge to form a filter circuit, which can suppress common-mode interference while also suppressing differential-mode interference, and has the characteristics of low circuit cost and good noise elimination effect;

[0011] 2. The utility model makes the voltage smoother and more stable through the setting of the rectifier bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the circuit diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the common-differential mode inductor of the utility model;

[0014] Figure 3 A circuit diagram of another embodiment of the present invention;

[0015] In the figure: 1. Skeleton; 2. Slot; 3. Coil; 4. Elastic clip; 5. Magnetic block; 6. Magnetic core. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] Example 1

[0018] See also Figure 1-2The utility model provides the following technical solutions: a common-differential mode integrated filter circuit capable of eliminating noise from LED lamps, comprising a common-differential mode inductor LF1, wherein the input end of the common-differential mode inductor LF1 is respectively connected to the neutral line N and the live line L, and a safety capacitor CX1 is connected in parallel to the input end of the common-differential mode inductor LF1, and further comprising a rectifier bridge, wherein the rectifier bridge comprises a diode BD1, a diode BD2, a diode BD3 and a diode BD4 connected end to end in sequence, and the rectifier bridge is connected to the output end of the common-differential mode inductor LF1, pin 2 of the output end of the common-differential mode inductor LF1 is connected to the positive end of the diode BD1, and pin 4 of the output end of the common-differential mode inductor LF1 is connected to the positive end of the diode BD2, and a film capacitor CB1 is connected in parallel between the negative end of the diode BD2 and the positive end of the diode BD4, the negative end of the diode BD2 is the VBUS+ signal end, and the positive end of the diode BD4 is the VBUS- signal end.

[0019] By adopting the above technical solution, the utility model is composed of a capacitor CX1, a common-differential mode inductor LF1, a capacitor CB1 and a rectifier bridge to form a filter circuit, which can suppress common-mode interference while also suppressing differential-mode interference, and has the characteristics of low circuit cost and good noise elimination effect; the utility model makes the voltage smoother and more stable through the setting of the rectifier bridge.

[0020] Specifically, a fuse F1 is connected in series between the input end of the common-differential mode inductor LF1 and the live wire L.

[0021] By adopting the above technical solution, overload and short circuit of the circuit can be prevented.

[0022] Specifically, the common-differential mode inductor LF1 includes a skeleton 1, a magnetic core 6 is provided inside the skeleton 1, a coil 3 is wound on the skeleton 1, a slot 2 is provided on the top of the skeleton 1, and a magnetic conductive block 5 is provided inside the slot 2. There are two slots 2, and the magnetic conductive block 5 is arranged in the slot 2 close to the side of the magnetic core 6. The magnetic conductive block 5 is composed of several magnetic conductive sheets stacked together. The magnetic core 6 is a U-shaped structure, and there are two magnetic cores 6, and the two magnetic cores 6 form a U-shaped structure. An elastic clip 4 is provided on the outside of the two magnetic cores 6.

[0023] By adopting the above technical solution, the common-differential mode inductor LF1 has the function of suppressing common-mode interference while also suppressing differential-mode interference.

[0024] Example 2

[0025] See also Figure 3, this embodiment differs from Embodiment 1 in that: specifically, the rectifier bridge is connected to the input end of the common differential mode inductor LF1, one input end of the common differential mode inductor LF1 is connected to the negative end of the diode BD2, the other input end of the common differential mode inductor LF1 is connected to the positive end of the diode BD4, the capacitor CX1 is connected in parallel to the positive end of the diode BD1 and the positive end of the diode BD2, the positive end of the diode BD1 is connected to the neutral line N, the positive end of the diode BD2 is connected to the live line L, the capacitor CB1 is connected in parallel to the output end of the common differential mode inductor LF1, and one output end of the common differential mode inductor LF1 is the VBUS+ signal end, and the other output end of the common differential mode inductor LF1 is the VBUS- signal end.

[0026] To sum up, the utility model is composed of a capacitor CX1, a common-differential mode inductor LF1, a capacitor CB1 and a rectifier bridge to form a filter circuit, which can suppress common-mode interference while also suppressing differential-mode interference, and has the characteristics of low circuit cost and good noise elimination effect; the utility model makes the voltage smoother and more stable through the setting of the rectifier bridge.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A common-mode and differential-mode integrated filter circuit capable of eliminating noise from LED lamps, characterized by: It includes a common-differential mode inductor LF1, the input end of the common-differential mode inductor LF1 is connected to the neutral line N and the live line L respectively, and the input end of the common-differential mode inductor LF1 is connected in parallel with a capacitor CX1, the output end of the common-differential mode inductor LF1 is connected in parallel with a capacitor CB1, and one output end of the common-differential mode inductor LF1 is a VBUS+ signal end, and the other output end of the common-differential mode inductor LF1 is a VBUS- signal end. It also includes a rectifier bridge, which is connected to the input end or the output end of the common-differential mode inductor LF1.

2. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 1, characterized in that: The rectifier bridge includes a diode BD1, a diode BD2, a diode BD3 and a diode BD4 connected in sequence end to end.

3. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 1, characterized in that: A fuse F1 is connected in series between the input end of the common-differential mode inductor LF1 and the live wire L.

4. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 1, characterized in that: The common differential mode inductor LF1 includes a skeleton, a magnetic core is provided inside the skeleton, a coil is wound on the skeleton, a slot is provided on the top of the skeleton, and a magnetic conductive block is provided inside the slot.

5. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 4, characterized in that: There are two slots in total, and the magnetic conductive block is arranged in the slot close to one side of the magnetic core.

6. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 4, characterized in that: The magnetic conductive block is formed by stacking a number of magnetic conductive sheets.

7. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 4, characterized in that: The magnetic core is a U-shaped structure, and two magnetic cores are provided, and the two magnetic cores form a U-shaped structure.

8. The common-differential mode integrated filter circuit capable of eliminating noise from LED lamps according to claim 7, characterized in that: Elastic clips are provided on the outside of the two magnetic cores.

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