Circuit for solving flicker of LED lamp caused by power grid interference

Abstract

The utility model discloses a circuit for solving flicker of an LED lamp caused by power grid interference, which comprises a duplex winding inductor L1 and a chip U1, a pin 1 of the duplex winding inductor L1 is connected with a live wire L, a pin 4 of the duplex winding inductor L1 is connected with a null line N, a pin 2 of the duplex winding inductor L1 is connected with a pin 1 of a bridge rectifier DB1, a pin 3 of the duplex winding inductor L1 is connected with a pin 2 of the bridge rectifier DB1, and a pin 3 of the duplex winding inductor L1 is connected with a pin 3 of the bridge rectifier DB1. A capacitor CX1 is further connected to the second pin and the third pin of the double-winding inductor L1 in parallel, the third pin of the bridge rectifier DB1 is connected with the positive electrode end of a lamp bead LED1, the negative electrode end of the lamp bead LED1 is connected with the eighth pin of the chip U1 and the positive electrode end of a lamp bead LED2, and the negative electrode end of the lamp bead LED2 is connected with the seventh pin of the chip U2 and the positive electrode end of a lamp bead LED3. According to the utility model, the dual-winding inductor L1 is arranged in the circuit, and the dual-winding inductor L1 plays a role in suppressing common-mode interference, so that the problem that the DOB linear lamp flickers due to the interference of a power grid is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of DOB linear circuits, and in particular relates to a circuit for solving the problem that LED lamps flicker due to interference from power grids. Background Art

[0002] Due to the rapid development of LED lamps, full-chip DOB linear solution lamps are rapidly applied. It does not have the huge transformer of the switching power supply, so the DOB linear solution lamps can be made very light and thin, which has a great advantage in the overall cost of the product.

[0003] Since different types of household appliances connected to the same power grid nearby will have a certain interference effect on the power grid, such as refrigerators, air conditioner compressors or electric fan motors, etc., the brightness of DOB linear lamps is easily changed or flickering due to power grid interference.

[0004] Therefore, there is an urgent need for a circuit to solve the problem of flickering of DOB linear lamps caused by power grid interference. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a circuit for solving the problem that LED lamps flicker due to power grid interference, which has the characteristic of solving the problem that DOB linear lamps flicker due to power grid interference.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a circuit for solving the problem of flickering of LED lamps caused by power grid interference, comprising a dual-winding inductor L1 and a chip U1, wherein pin 1 of the dual-winding inductor L1 is connected to the live wire L, pin 4 of the dual-winding inductor L1 is connected to the neutral wire N, pin 2 of the dual-winding inductor L1 is connected to pin 1 of the rectifier bridge DB1, pin 3 of the dual-winding inductor L1 is connected to pin 2 of the rectifier bridge DB1, and pins 2 and 3 of the dual-winding inductor L1 are ... and pin 2 and pin 3 of the dual-winding inductor L1 are connected to the live wire L, pin 4 of the dual-winding inductor L1 is connected to the neutral wire N, pin 2 of the dual-winding inductor L1 is connected to pin 1 of the rectifier bridge DB1, and pin 3 of the dual-winding inductor L1 is connected to the live wire L, pin 4 of the dual-winding inductor L1 is connected to the neutral wire N, pin 2 of the dual-winding inductor L1 is connected to pin 1 of the rectifier bridge DB1, pin 3 of the dual-winding inductor L1 is connected to pin A capacitor CX1 is also connected in parallel, and the capacitor CX1 is an X capacitor. Pin 3 of the rectifier bridge stack DB1 is connected to the positive terminal of the lamp bead LED1, the negative terminal of the lamp bead LED1 is connected to pin 8 of the chip U1 and the positive terminal of the lamp bead LED2, the negative terminal of the lamp bead LED2 is connected to pin 7 of the chip U2 and the positive terminal of the lamp bead LED3, the negative terminal of the lamp bead LED3 is connected to pin 5 of the chip U1, and pin 4 of the rectifier bridge stack DB1 is connected to pin 9 of the chip U1.

[0007] In order to suppress common-mode interference on the live wire L and the neutral wire N, further, capacitor CY1 and capacitor CY2 are included. Capacitor CY1 is connected in parallel between the live wire L and the ground wire G, and capacitor CY2 is connected in parallel between the neutral wire N and the ground wire G. Both capacitor CY1 and capacitor CY2 are Y capacitors.

[0008] In order to fuse and break the circuit to provide protection when a surge occurs or other large current is generated, a fuse resistor RF1 is connected in series between the live wire L and pin 1 of the dual-winding inductor L1, and a fuse resistor RF2 is connected in series between the neutral wire N and pin 4 of the dual-winding inductor L1.

[0009] In order to adjust the current flowing through the lamp beads LED1, LED2 and LED3, a resistor R1 is further connected between the pin 2 of the chip U1 and the pin 9 of the chip U1.

[0010] In order to compensate and adjust the current, a capacitor C1 is further connected between the 4th pin of the chip U1 and the 9th pin of the chip U1.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model sets a double-winding inductor L1 in the circuit, and the double-winding inductor L1 plays a role in suppressing common-mode interference, thereby solving the problem of flickering caused by power grid interference in DOB linear lamps;

[0013] 2. The utility model sets a capacitor CX1 in the circuit. The capacitor CX1 adopts an X capacitor to suppress the differential mode interference on the live wire L and the neutral wire N;

[0014] 3. The utility model further includes a capacitor CY1 and a capacitor CY2. The capacitor CY1 is connected in parallel between the live wire L and the neutral wire N, and the capacitor CY2 is connected in parallel between the neutral wire N and the ground wire G. The capacitor CY1 and the capacitor CY2 are both Y capacitors. The capacitor CY1 and the capacitor CY2 play an effect of suppressing common-mode interference on the live wire L and the neutral wire N.

[0015] 4. In the utility model, a fuse resistor RF1 is connected in series between the live wire L and the 1st foot of the double-winding inductor L1, and a fuse resistor RF2 is connected in series between the neutral wire N and the 4th foot of the double-winding inductor L1. Through the setting of the fuse resistor RF1 and the fuse resistor RF2, when a surge occurs or other large current is generated, the circuit is disconnected by fusing, thereby generating a protective effect;

[0016] 5. A resistor R1 is connected between pin 2 of the chip U1 of the utility model and pin 9 of the chip U1, and the current flowing through the lamp beads LED1, LED2 and LED3 is adjusted by the resistor R1;

[0017] 6. A capacitor C1 is connected between pin 4 of the chip U1 of the utility model and pin 9 of the chip U1, and the current is compensated and adjusted through the capacitor C1. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is the circuit diagram of the utility model; DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example 1

[0022] See also Figure 1 The utility model provides the following technical solutions: a circuit for solving the problem of flickering of LED lamps caused by power grid interference, including a double-winding inductor L1 and a chip U1, wherein pin 1 of the double-winding inductor L1 is connected to the live wire L, pin 4 of the double-winding inductor L1 is connected to the neutral wire N, pin 2 of the double-winding inductor L1 is connected to pin 1 of the rectifier bridge DB1, pin 3 of the double-winding inductor L1 is connected to pin 2 of the rectifier bridge DB1, and a capacitor CX1 is connected in parallel to pins 2 and 3 of the double-winding inductor L1, the capacitor CX1 is an X capacitor, pin 3 of the rectifier bridge DB1 is connected to the positive terminal of the lamp bead LED1, and the negative terminal of the lamp bead LED1 is connected to the chip U1 respectively. The 8th pin of chip U1 is connected to the positive terminal of lamp bead LED2, the negative terminal of lamp bead LED2 is respectively connected to the 7th pin of chip U2 and the positive terminal of lamp bead LED3, the negative terminal of lamp bead LED3 is connected to the 5th pin of chip U1, the 4th pin of rectifier bridge stack DB1 is connected to the 9th pin of chip U1, chip U1 is used to control the normal operation of lamp beads LED1, lamp beads LED2 and lamp beads LED3, the rectifier bridge stack DB1 plays the role of rectification, the dual-winding inductor L1 is preferably the SQ1212 type of Kunshan Zhenhuawei, the chip U1 is preferably the JW19856 type of Jewatt, and the rectifier bridge stack DB1 is preferably the DB107 type of Quanta.

[0023] By adopting the above technical scheme, the utility model sets a dual-winding inductor L1 in the circuit, and the dual-winding inductor L1 plays a role in suppressing common-mode interference, thereby solving the problem of flickering of DOB linear lamps caused by power grid interference; the utility model sets a capacitor CX1 in the circuit, and the capacitor CX1 adopts an X capacitor, which plays an effect of suppressing differential-mode interference on the live wire L and the neutral wire N.

[0024] Specifically, it also includes a capacitor CY1 and a capacitor CY2. The capacitor CY1 is connected in parallel between the live wire L and the ground wire G. The capacitor CY2 is connected in parallel between the neutral wire N and the ground wire G. Both the capacitor CY1 and the capacitor CY2 are Y capacitors.

[0025] By adopting the above technical solution, the capacitor CY1 and the capacitor CY2 can suppress the common mode interference on the live line L and the neutral line N.

[0026] Example 2

[0027] The present embodiment is different from the first embodiment in that: specifically, a fuse resistor RF1 is connected in series between the live wire L and the pin 1 of the dual-winding inductor L1, and a fuse resistor RF2 is connected in series between the neutral wire N and the pin 4 of the dual-winding inductor L1.

[0028] By adopting the above technical solution and setting the fuse resistor RF1 and the fuse resistor RF2, when a surge occurs or other large current is generated, the circuit is disconnected by fusing, thereby producing a protective effect.

[0029] Example 3

[0030] The difference between this embodiment and the first embodiment is that: specifically, a resistor R1 is connected between the pin 2 of the chip U1 and the pin 9 of the chip U1.

[0031] By adopting the above technical solution, the current flowing through the lamp beads LED1, LED2 and LED3 is adjusted through the resistor R1 to adjust the power and brightness of the product.

[0032] Example 4

[0033] The difference between this embodiment and the first embodiment is that: specifically, a capacitor C1 is connected between the 4th pin of the chip U1 and the 9th pin of the chip U1.

[0034] By adopting the above technical solution, the current is compensated and adjusted through capacitor C1 to ensure the stability of product power and brightness.

[0035] In summary, the utility model sets a dual-winding inductor L1 in the circuit, and the dual-winding inductor L1 plays a role in suppressing common-mode interference, thereby solving the problem of flickering of DOB linear lamps caused by power grid interference; the utility model sets a capacitor CX1 in the circuit, and the capacitor CX1 adopts an X capacitor, which plays an effect of suppressing differential-mode interference on the live wire L and the neutral wire N; the utility model also includes a capacitor CY1 and a capacitor CY2, the capacitor CY1 is connected in parallel between the live wire L and the ground wire G, the capacitor CY2 is connected in parallel between the neutral wire N and the ground wire G, the capacitor CY1 and the capacitor CY2 are both Y capacitors, and the capacitor CY1 and the capacitor CY2 play an effect of suppressing common-mode interference on the live wire L and the neutral wire N; In the utility model, a fuse resistor RF1 is connected in series between the live wire L and the pin 1 of the dual-winding inductor L1, and a fuse resistor RF2 is connected in series between the neutral wire N and the pin 4 of the dual-winding inductor L1. Through the setting of the fuse resistor RF1 and the fuse resistor RF2, when a surge occurs or other large current is generated, the circuit is broken by melting to produce a protective effect; a resistor R1 is connected between the pin 2 of the chip U1 of the utility model and the pin 9 of the chip U1, and the current flowing through the lamp beads LED1, LED2 and LED3 is adjusted by the resistor R1; a capacitor C1 is connected between the pin 4 of the chip U1 of the utility model and the pin 9 of the chip U1, and the current is compensated and adjusted by the capacitor C1.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circuit to solve the problem of LED lamps flickering due to power grid interference, characterized by: It includes a dual-winding inductor L1 and a chip U1, wherein pin 1 of the dual-winding inductor L1 is connected to the live wire L, pin 4 of the dual-winding inductor L1 is connected to the neutral wire N, pin 2 of the dual-winding inductor L1 is connected to pin 1 of the rectifier bridge DB1, pin 3 of the dual-winding inductor L1 is connected to pin 2 of the rectifier bridge DB1, capacitor CX1 is also connected in parallel to pins 2 and 3 of the dual-winding inductor L1, pin 3 of the rectifier bridge DB1 is connected to the positive terminal of the lamp bead LED1, the negative terminal of the lamp bead LED1 is respectively connected to pin 8 of the chip U1 and the positive terminal of the lamp bead LED2, the negative terminal of the lamp bead LED2 is respectively connected to pin 7 of the chip U2 and the positive terminal of the lamp bead LED3, the negative terminal of the lamp bead LED3 is connected to pin 5 of the chip U1, and pin 4 of the rectifier bridge DB1 is connected to pin 9 of the chip U1.

2. A circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 1, characterized in that: The capacitor CX1 is an X capacitor.

3. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 1, characterized in that: It also includes a capacitor CY1, which is connected in parallel between the live wire L and the ground wire G.

4. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 3, characterized in that: The capacitor CY1 is a Y capacitor.

5. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 1, characterized in that: It also includes a capacitor CY2, which is connected in parallel between the neutral line N and the ground line G.

6. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 5, characterized in that: The capacitor CY2 is a Y capacitor.

7. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 1, characterized in that: A fuse resistor RF1 is connected in series between the live wire L and the pin 1 of the dual-winding inductor L1 , and a fuse resistor RF2 is connected in series between the neutral wire N and the pin 4 of the dual-winding inductor L1 .

8. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 1, characterized in that: A resistor R1 is connected between the pin 2 of the chip U1 and the pin 9 of the chip U1.

9. The circuit for solving the problem of flickering of LED lamps caused by power grid interference according to claim 1, characterized in that: A capacitor C1 is connected between the 4th pin of the chip U1 and the 9th pin of the chip U1.

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