CN219164777U

CN219164777U - LED linear circuit

Info

Publication number: CN219164777U
Application number: CN202222490422.4U
Authority: CN
Inventors: 陈松辉; 王强; 吴开盛
Original assignee: Pak Corp Co Ltd
Current assignee: Pak Corp Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-06-09
Anticipated expiration: 2032-09-20

Abstract

The utility model discloses an LED linear circuit which comprises a rectification filter circuit, an LED lamp bead group, a line voltage compensation circuit and a linear constant current circuit, wherein the rectification filter circuit is connected with the LED lamp bead group and is used for converting input alternating current into direct current, the line voltage compensation circuit is connected with the linear constant current circuit in series, the LED lamp bead group comprises two sections of LED lamp bead circuits, the two sections of LED lamp bead circuits are respectively connected with the linear constant current circuit in series, and the linear constant current circuit is used for adjusting the current of the two sections of LED lamp bead circuits. The LED lamp beads are connected in two sections, the linear constant current circuit adjusts the current direction and the current size, only one section of LED lamp bead is connected in low voltage, and two sections of LED lamp beads are connected in high voltage, so that the lamp bead group is free of stroboscopic effect, multiple groups of LED lamp beads are connected in, and the efficiency of an LED linear scheme is improved.

Description

LED linear circuit

Technical Field

The utility model relates to the field of LED linear schemes, in particular to an LED linear circuit.

Background

LED lamps are preferred in many lighting applications because of their relative simplicity and ease of design. In order to stabilize the current of an LED, a common constant current scheme mostly achieves the purpose of controlling the current by controlling the on-off of a power supply to form a wave pattern, but the circuit is complex, electronic elements such as a transformer and the like are more, the production process is complex, the production cost is higher, and the fault probability is higher, so that an LED linear scheme is provided. Referring to fig. 2, the LED linear scheme in the prior art is a single-segment LED lamp D access, and the main disadvantage of the single segment is that: when the input voltage is low, a stroboscopic problem can occur, and the problem can be solved only by reducing the number of lamp strings, so that the efficiency of the single-ended LED lamp access scheme is greatly reduced.

Disclosure of Invention

The utility model aims to at least solve the problems of low efficiency and stroboscopic effect of an LED (light-emitting diode) lamp bead group in the linear scheme of the LED in the prior art.

Therefore, the utility model provides an LED linear circuit, which comprises a rectifying and filtering circuit, an LED lamp bead group, a line voltage compensation circuit and a linear constant current circuit, wherein the rectifying and filtering circuit is connected with the LED lamp bead group, the rectifying and filtering circuit is used for converting input alternating current into direct current, the line voltage compensation circuit is connected with the linear constant current circuit in series, the LED lamp bead group comprises at least two sections of LED lamp bead circuits, the LED lamp bead circuits are respectively connected with the linear constant current circuit in series, and the linear constant current circuit is used for adjusting the current of the LED lamp bead circuit.

Further, the rectifying and filtering circuit comprises a rectifier, a first capacitor and a first resistor, the rectifier is connected with the first capacitor and the first resistor in parallel, and the rectifier is connected with the LED lamp bead group.

Further, the power supply circuit further comprises an input protection circuit, and the input protection circuit is connected with the rectifier.

Further, the LED lamp bead group comprises a first section of LED lamp bead circuit and a second section of LED lamp bead circuit, wherein the first section of LED lamp bead circuit is provided with not less than 2 LED lamps, the second section of LED lamp bead circuit is provided with not less than 1 LED lamp, and the LED lamps are connected in series.

Further, the line voltage compensation circuit comprises a second capacitor, a second resistor and a third resistor, the second resistor is connected with the third resistor in series, the second capacitor is connected with the third resistor in parallel, and the second resistor is connected with the first section of LED lamp bead circuit.

Further, the linear constant current circuit comprises a linear constant current chip, a fourth resistor and a fifth resistor, the fourth resistor and the fifth resistor are connected in parallel, and the linear constant current chip is connected with the fourth resistor and the fifth resistor.

Further, the first capacitor is an electrolytic capacitor, the positive electrode of the electrolytic capacitor is connected with the first output end of the rectifier, and the negative electrode of the electrolytic capacitor is connected with the second output end of the rectifier.

Further, the input protection circuit is a current fuse, the current fuse is connected with the rectifier, and the current fuse is used for cutting off the circuit according to current.

The beneficial effects of the utility model are as follows: the utility model provides an LED linear circuit which comprises a rectification filter circuit, an LED lamp bead group, a line voltage compensation circuit and a linear constant current circuit, wherein the rectification filter circuit is connected with the LED lamp bead group and is used for converting input alternating current into direct current, the line voltage compensation circuit is connected with the linear constant current circuit in series, the LED lamp bead group comprises two sections of LED lamp bead circuits, the two sections of LED lamp bead circuits are respectively connected with the linear constant current circuit in series, and the linear constant current circuit is used for adjusting the current of the two sections of LED lamp bead circuits. The LED lamp beads are connected in two sections, the linear constant current circuit adjusts the current direction and the current size, only one section of LED lamp bead is connected in low voltage, and two sections of LED lamp beads are connected in high voltage, so that the lamp bead group is free of stroboscopic effect, multiple groups of LED lamp beads are connected in, and the efficiency of an LED linear scheme is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a circuit diagram of the present utility model;

fig. 2 is a circuit diagram of the prior art.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described by means of implementation examples with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, the embodiment of the utility model discloses an LED linear circuit, which comprises a rectifying and filtering circuit, an LED lamp bead group, a line voltage compensating circuit and a linear constant current circuit, wherein the rectifying and filtering circuit is connected with the LED lamp bead group, the rectifying and filtering circuit is used for converting input alternating current into direct current, the line voltage compensating circuit is connected with the linear constant current circuit in series, the LED lamp bead group comprises two sections of LED lamp bead circuits, the two sections of LED lamp bead circuits are respectively connected with the linear constant current circuit in series, and the linear constant current circuit is used for adjusting the current of the two sections of LED lamp bead circuits. The LED lamp beads are connected in two sections, the linear constant current circuit adjusts the current direction and the current size, only one section of LED lamp bead is connected in low voltage, and two sections of LED lamp beads are connected in high voltage, so that the lamp bead group is free of stroboscopic effect, multiple groups of LED lamp beads are connected in, and the efficiency of an LED linear scheme is improved.

The rectifying and filtering circuit comprises a rectifying circuit B and a filtering circuit C, the rectifying circuit comprises a rectifier DB1, the rectifier adopts an MB10F bridge rectifier, the filtering circuit comprises a first capacitor EC1 and a first resistor R1, a pin 2 of the rectifier is an output positive electrode, a pin 4 is a negative electrode, a pin 1 and a pin 3 of the rectifier are alternating currents, the pin 1 of the rectifier is connected with the positive electrode of the first capacitor EC1 and the first resistor R1, the first capacitor EC1 is connected with the first resistor R1 in parallel, and a pin 4 of the rectifier is connected with the negative electrode of the first capacitor EC1 and the first resistor R1; the rectification circuit converts the input alternating current into direct current, the filtering circuit filters the alternating current after receiving the direct current, and the first capacitor EC1 is used for storing electric energy to supply power for the LED lamp bead group.

In some embodiments, the present embodiment further includes an input protection circuit a, where the input protection circuit a is connected to the ac input terminal of the rectifier. The input protection circuit is a current fuse FR1, the current fuse is a Z-shaped bent angle, and the model is not limited to any current fuse; when the current passing through the current fuse FR1 increases to a certain value, the current fuse FR1 fuses itself to cut off the circuit, thereby limiting the current and ensuring the safety of the circuit.

In some embodiments, the LED light bead group includes a first section of LED light bead circuit and a second section of LED light bead circuit, the first section of LED light bead circuit is provided with 5 LED lights, the second section of LED light bead circuit is provided with 2 LED lights, the number of LED light beads accessed here is decided according to the light bead specification voltage, and can be adjusted according to specific actual conditions during use. The LED lamps are connected in series, so that the efficiency of the circuit is improved. The LED lamp bead group is connected with the rectifier pin 2.

In some embodiments, the line voltage compensation circuit includes a second capacitor C1, a second resistor R2, and a third resistor R3, where the second resistor R2 is connected in series with the third resistor R3, the third resistor R3 is connected to the linear constant current circuit, the second capacitor C1 is connected in parallel with the third resistor R3, and the second resistor R2 is connected to the first segment LED bead circuit. The line voltage compensation circuit F controls the current amplitude reduced by the LED, so that the input power is basically not changed along with the line voltage, the utilization rate of the LED is improved, and the efficiency of the circuit is improved.

In some embodiments, the linear constant current circuit comprises a linear constant current chip U1, a fourth resistor R4 and a fifth resistor R5, wherein the chip adopts a BP5228DL constant current chip, the fourth resistor R4 and the fifth resistor R5 are connected in parallel and then connected with a chip CS pin, the pins D1 and D2 are connected with an LED lamp bead group, the chip ensures that the circuit current is constant, when low voltage is input, only the first section of LED lamp beads are lighted, and at the moment, the chip accurately sets the LED current through the resistor and keeps the current stable; when high voltage is input, the two sections of LED lamp beads are both lightened, the chip reduces LED current according to the voltage at the end of the pin D2, and meanwhile, the current is kept stable according to the resistor.

In some embodiments, the first capacitor EC1 is an electrolytic capacitor, the positive electrode of which is connected to the pin 2 of the rectifier, and the negative electrode of which is connected to the pin 4 of the rectifier.

The principle of this embodiment is: when the input voltage passes through a, current is limited by the current fuse FR1, and when the current passing through FR1 increases to a certain value, the current fuse fuses itself to cut off the circuit, thereby limiting the current. Rectifying by a rectifying circuit B, filtering by a filtering circuit C for energy storage, and supplying output current to a first section of LED lamp bead circuit D and a second section of LED lamp bead circuit E for use, wherein a linear constant current circuit G ensures constant current, and when low voltage is input, only the first section of LED lamp bead is lightened, and at the moment, the chip accurately sets the LED current through an external resistor to keep the current stable; when high voltage is input, the two sections of LED lamp beads are both lightened, the chip reduces LED current according to the voltage at the end of the pin D2, meanwhile, the current is kept stable according to an external resistor, and the input line voltage compensation circuit F controls the current amplitude reduced by the LED, so that the input power is basically not changed along with line voltage, the utilization rate of the LED is improved, and the efficiency of the circuit is improved.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present utility model in combination with the specific contents of the technical scheme.

In the description of the present utility model, a description of the terms "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples," etc., means that a particular feature or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims

1. An LED linear circuit, comprising: the LED lamp bead group comprises at least two sections of LED lamp bead circuits, the LED lamp bead circuits are respectively connected with the linear constant current circuit in series, and the linear constant current circuit is used for adjusting the current of the LED lamp bead circuits.

2. An LED linear circuit according to claim 1, wherein: the rectification filter circuit comprises a rectifier, a first capacitor and a first resistor, wherein the rectifier is connected with the first capacitor and the first resistor in parallel, and the rectifier is connected with the LED lamp bead group.

3. An LED linear circuit according to claim 2, wherein: the input protection circuit is connected with the rectifier.

4. An LED linear circuit according to claim 1, wherein: the LED lamp bead group comprises a first section of LED lamp bead circuit and a second section of LED lamp bead circuit, wherein the first section of LED lamp bead circuit is provided with at least 2 LED lamps, the second section of LED lamp bead circuit is provided with at least 1 LED lamp, and the LED lamps are connected in series.

5. An LED linear circuit according to claim 4, wherein: the line voltage compensation circuit comprises a second capacitor, a second resistor and a third resistor, wherein the second resistor is connected with the third resistor in series, the second capacitor is connected with the third resistor in parallel, and the second resistor is connected with the first section of LED lamp bead circuit.

6. An LED linear circuit according to claim 5, wherein: the linear constant current circuit comprises a linear constant current chip, a fourth resistor and a fifth resistor, wherein the fourth resistor and the fifth resistor are connected in parallel, and the linear constant current chip is connected with the fourth resistor and the fifth resistor.

7. An LED linear circuit according to claim 2, wherein: the first capacitor is an electrolytic capacitor, the positive electrode of the electrolytic capacitor is connected with the first output end of the rectifier, and the negative electrode of the electrolytic capacitor is connected with the second output end of the rectifier.

8. A LED linear circuit according to claim 3, characterized in that: the input protection circuit is a current fuse, the current fuse is connected with the rectifier, and the current fuse is used for cutting off the circuit according to current.