A spotlight mirror

Abstract

The utility model discloses a spotlight mirror belongs to the technical field of lamp mirror, solve the LED lamp string in the lamp mirror among adoption full series connection design, and the current path is interrupted after one lamp pearl open circuit, and the remaining lamp pearl is compensated by drive circuit, and the whole is slightly bright, and therefore lead to single lamp pearl damage to cause the whole lamp band to be dark or not bright. Including mirror frame, the front inner ring of mirror frame is equipped with light guide slope, is equipped with the groove on the light guide slope, the inlayed LED lamp string has in the groove, the LED lamp string electric connection has the lamp string protection circuit, the lamp string protection circuit is through the formation current bypass channel when the open circuit of any LED lamp pearl in LED lamp string, and the current of constant current drive output maintains the original path and continues to flow through the rest normal LED lamp pearl. The utility model works, and the lamp string protection circuit is conducted by bypass resistance when any LED open circuit, and the constant current current freewheeling the rest lamp pearl, and the light is gathered for the user spotlight by light guide slope.

Description

Technical Field

[0001] This utility model relates to the field of lamp mirror technology, and in particular to a spotlight mirror. Background Technology

[0002] A light-up mirror is a bathroom fixture that combines mirror and lighting functions, typically installed on a bathroom wall. Its mirror surface is made of high-quality material, providing a clear image. The accompanying lighting system offers even and soft light, convenient for washing, applying makeup, etc., and comes in various styles to match different bathroom designs, combining practicality and aesthetics.

[0003] However, the LED string in the light mirror adopts a fully series design. When one of the LED beads is open-circuited, the current path is interrupted. The remaining LED beads are compensated by the driver circuit, which results in a dim overall brightness. Therefore, the failure of a single LED bead causes the entire light strip to dim or not light up.

[0004] Therefore, a spotlight lens is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a spotlight lens.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A spotlight lens includes a frame, with a light-guiding bevel on the inner circle of the front side of the frame. A groove is formed on the light-guiding bevel, and an LED string is embedded in the groove. The LED string is electrically connected to a string protection circuit. When any LED in the LED string is open-circuited, the string protection circuit forms a current bypass channel to ensure that the current output by the constant current drive maintains its original path and continues to flow through the remaining normal LEDs.

[0007] Preferably, the LED string protection circuit includes a power conversion module and a constant current drive module. The positive DC output of the power conversion module is connected to the voltage input of the constant current drive module, the negative DC output of the power conversion module is grounded, the current output of the constant current drive module is connected to the input of the LED string, and the grounding terminal of the LED string is grounded.

[0008] Preferably, the power conversion module includes a fuse, an AC / DC converter, and a filter capacitor. The first end of the fuse is connected to the live wire of the mains power supply, and the second end of the fuse is connected to the AC input terminal of the AC / DC converter. The AC neutral terminal of the AC / DC converter is connected to the neutral wire of the mains power supply. The positive terminal of the DC output of the AC / DC converter is connected to both the positive terminal of the filter capacitor and the input terminal of the constant current drive module. The negative terminal of the DC output of the AC / DC converter is grounded, and the negative terminal of the filter capacitor is grounded.

[0009] Preferably, the constant current drive module includes a PT4115 constant current drive chip, a power inductor, a current sampling resistor, a freewheeling diode, and a total current limiting resistor. The power terminal of the PT4115 constant current drive chip is connected to the output terminal of the power conversion module. The power switching terminal of the PT4115 constant current drive chip is connected to the first terminal of the power inductor and the anode of the freewheeling diode. The current sampling terminal of the PT4115 constant current drive chip is connected to the first terminal of the current sampling resistor. The ground terminal of the PT4115 constant current drive chip is grounded. The cathode of the freewheeling diode is energized. The second terminal of the power inductor is connected to the first terminal of the total current limiting resistor. The second terminal of the total current limiting resistor is connected to the input terminal of the LED string. The second terminal of the current sampling resistor is grounded.

[0010] Preferably, the LED string includes a plurality of LED beads connected in series and a plurality of bypass resistors. The positive terminal of the first LED bead is connected to the second terminal of the total current limiting resistor in the constant current drive module. The first terminal of the bypass resistor is connected to the positive terminal of the LED bead, and the second terminal of the bypass resistor is connected to the negative terminal of the LED bead. The negative terminals of all LED beads except the last one are connected to the input terminal of the next LED bead, and the negative terminal of the last LED bead is grounded.

[0011] Preferably, the bypass resistor is a metal film resistor.

[0012] This utility model has the following beneficial effects: When this invention is in operation, the LED string protection circuit automatically conducts through its parallel bypass resistor to form a current bypass channel when any LED bead is open-circuited. This allows the current output by the constant current drive to maintain its original path and continue to flow through the remaining normal LED beads, thereby enabling the light emitted by the LED string to be focused in conjunction with the light guide slope, so as to provide focused lighting for the user. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural block diagram of the LED string protection circuit in this utility model.

[0015] 1. Frame; 101. Mirror; 102. Groove; 2. Groove body; 201. Toothbrush groove; 202. Cup groove; 3. Connecting piece; 301. Through hole; 4. LED light string; 5. Power conversion module; 6. Constant current drive module. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] A type of spotlight lens, such as Figure 1 As shown, the device includes a frame 1. A light guide bevel is formed on the inner circle of the front of the frame 1. A groove 102 is formed on the light guide bevel. An LED string 4 is embedded in the groove 102. The LED string 4 is electrically connected to a string protection circuit. When any LED in the LED string 4 is open-circuited, the string protection circuit forms a current bypass channel to ensure that the current output by the constant current drive continues to flow through the remaining normal LEDs.

[0023] The bottom of the frame 1 is integrally formed with a groove 2. The top surface of the groove 2 is recessed downward to form a toothbrush grass 201 and a cup groove 202. The top of the frame 1 is integrally formed with a connecting piece 3. The connecting piece 3 has a through hole 301 through which it passes.

[0024] like Figure 2 As shown, the LED string protection circuit includes a light source conversion module and a constant current drive module 6. The positive DC output of the power conversion module 5 is connected to the voltage input terminal of the constant current drive module 6, the negative DC output of the power conversion module 5 is grounded, the current output terminal of the constant current drive module 6 is connected to the input terminal of the LED string 4, and the ground terminal of the LED string 4 is grounded.

[0025] The light source conversion module includes a fuse, an AC / DC converter, and a filter capacitor. The first end of the fuse is used to connect to the mains live wire, and the second end of the fuse is connected to the AC input terminal of the AC / DC converter. The AC neutral terminal of the AC / DC converter is used to connect to the mains neutral wire. The positive terminal of the DC output of the AC / DC converter is connected to both the positive terminal of the filter capacitor and the input terminal of the constant current drive module 6. The negative terminal of the DC output of the AC / DC converter is grounded, and the negative terminal of the filter capacitor is grounded.

[0026] The constant current drive module 6 includes a PT4115 constant current drive chip, a power inductor, a current sampling resistor, a freewheeling diode, and a total current limiting resistor. The power terminal of the PT4115 constant current drive chip is connected to the output terminal of the power conversion module 5. The power switching terminal of the PT4115 constant current drive chip is connected to the first terminal of the power inductor and the anode of the freewheeling diode. The current sampling terminal of the PT4115 constant current drive chip is connected to the first terminal of the current sampling resistor. The ground terminal of the PT4115 constant current drive chip is grounded. The cathode of the freewheeling diode is energized. The second terminal of the power inductor is connected to the first terminal of the total current limiting resistor. The second terminal of the total current limiting resistor is connected to the input terminal of the LED string 4. The second terminal of the current sampling resistor is grounded.

[0027] The LED string 4 includes several LED beads arranged in series and several bypass resistors. The bypass resistors are metal film resistors. The positive terminal of the first LED bead is connected to the second terminal of the total current limiting resistor in the constant current drive module 6. The first terminal of the bypass resistor is connected to the positive terminal of the LED bead, and the second terminal of the bypass resistor is connected to the negative terminal of the LED bead. The negative terminals of all LED beads except the last one are connected to the input terminal of the next LED bead. The negative terminal of the last LED bead is grounded.

[0028] When this utility model is in operation, the light string protection circuit automatically conducts through the parallel bypass resistor to form a current bypass channel when any LED bead is open, so that the current output by the constant current drive continues to flow through the other normal LED beads along the original path. This allows the light emitted by the LED string 4 to be focused in conjunction with the light guide slope, so as to provide focused lighting for the user.

[0029] When the string light protection circuit is working, the power conversion module 5 converts the external AC input into a stable DC voltage output. Its positive terminal is connected to the PT4115 constant current driver chip, and its negative terminal is grounded.

[0030] In constant current drive module 6, the PT4115 constant current drive chip controls the current path through the high-frequency switching of the internal switching transistor. When the power switch is turned on, the current is stored in the power inductor and flows to the total current limiting resistor.

[0031] When the power switch is turned off, the power inductor releases energy and forms a freewheeling circuit through the freewheeling diode.

[0032] The current sampling resistor detects the load current. Its first end is connected to the current sampling terminal of the PT4115 constant current driver chip, and its second end is grounded. It converts the current signal into voltage feedback, which enables the PT4115 constant current driver chip to dynamically adjust the switching duty cycle and finally lock the output current within a certain range. The constant current output is buffered by the total current limiting resistor and then sent to the positive input terminal of the first LED bead in the LED string 4.

[0033] In LED string 4, multiple LED beads form the main lighting link. The positive terminal of each LED bead is directly connected to the output terminal of the preamp. Each LED bead is independently connected in parallel with a bypass resistor. The first end of the bypass resistor is soldered to the positive terminal of the bypass resistor at the same node, and the second end is soldered to the negative terminal of the bypass resistor at the same node.

[0034] During normal operation, the on-state voltage drop of the LED beads is only 3.0V, which is far below the on-state threshold of the bypass resistor. Therefore, the bypass resistor is in a high-resistance state, and the current flows completely through the LED string 4.

[0035] When any LED bead experiences an open circuit fault, the voltage behavior at the fault point changes drastically. The positive voltage of the LED bead rises rapidly due to the continuous injection of charge from the constant current source. When the voltage between its positive and negative terminals exceeds the action threshold of the bypass resistor, the main current path is forcibly switched.

[0036] During this process, the PT4115 constant current driver chip continuously monitors the current. When it detects a sudden change in load impedance, it immediately increases the output voltage to maintain a constant current.

[0037] At this time, except for the damaged LED beads which do not light up due to open circuit, the other LED beads still maintain voltage drop and rated brightness, while the bypass resistor generates heat dissipation because it bears the full current.

[0038] The fault bypass process is completed in a short time without any brightness fluctuations, avoiding the defect of a single bead being open in a traditional series design, which causes the entire lamp to be dimly lit.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A spotlight lens, characterized in that, The frame includes a mirror frame (1), on which a light guide bevel is formed on the inner circle of the front side. A groove (102) is formed on the light guide bevel. An LED string (4) is embedded in the groove (102). The LED string (4) is electrically connected to a protection circuit. When any LED bead in the LED string (4) is open-circuited, the protection circuit forms a current bypass channel to ensure that the current output by the constant current drive maintains its original path and continues to flow through the remaining normal LED beads.

2. A spotlight lens according to claim 1, characterized in that, The protection circuit of the LED string (4) includes a power conversion module (5) and a constant current drive module (6). The positive DC output of the power conversion module (5) is connected to the voltage input terminal of the constant current drive module (6), the negative DC output of the power conversion module (5) is grounded, the current output terminal of the constant current drive module (6) is connected to the input terminal of the LED string (4), and the ground terminal of the LED string (4) is grounded.

3. A spotlight lens according to claim 2, characterized in that, The power conversion module (5) includes a fuse, an AC / DC converter, and a filter capacitor. The first end of the fuse is used to connect to the mains live wire, and the second end of the fuse is connected to the AC input terminal of the AC / DC converter. The AC neutral terminal of the AC / DC converter is used to connect to the mains neutral wire. The positive DC output of the AC / DC converter is connected to both the positive terminal of the filter capacitor and the input terminal of the constant current drive module (6). The negative DC output of the AC / DC converter is grounded, and the negative terminal of the filter capacitor is grounded.

4. A spotlight lens according to claim 2, characterized in that, The constant current drive module (6) includes a PT4115 constant current drive chip, a power inductor, a current sampling resistor, a freewheeling diode, and a total current limiting resistor. The power terminal of the PT4115 constant current drive chip is connected to the output terminal of the power conversion module (5). The power switching terminal of the PT4115 constant current drive chip is connected to the first terminal of the power inductor and the anode of the freewheeling diode. The current sampling terminal of the PT4115 constant current drive chip is connected to the first terminal of the current sampling resistor. The ground terminal of the PT4115 constant current drive chip is grounded. The cathode of the freewheeling diode is powered. The second terminal of the power inductor is connected to the first terminal of the total current limiting resistor. The second terminal of the total current limiting resistor is connected to the input terminal of the LED string (4). The second terminal of the current sampling resistor is grounded.

5. A spotlight lens according to claim 2, characterized in that, The LED string (4) includes several LED beads arranged in series and several bypass resistors. The positive terminal of the first LED bead is connected to the second end of the total current limiting resistor in the constant current drive module (6). The first end of the bypass resistor is connected to the positive terminal of the LED bead, and the second end of the bypass resistor is connected to the negative terminal of the LED bead. The negative terminals of the remaining LED beads, except for the last one, are connected to the input terminal of the next LED bead. The negative terminal of the last LED bead is grounded.

6. A spotlight lens according to claim 5, characterized in that, The bypass resistor is a metal film resistor.

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