CN220874758U - LED drive circuit and LED straight tube lamp - Google Patents

Abstract

The application discloses an LED driving circuit and an LED straight tube lamp, wherein the LED driving circuit comprises a rectifying unit for supplying power to a light-emitting element, the rectifying unit is used for converting alternating current into direct current, a plurality of inductance units which are connected in parallel and have different inductance values are arranged between the rectifying unit and the light-emitting element, and a change-over switch for communicating one of the inductance units is arranged between the rectifying unit and the light-emitting element. The application changes the luminous flux of the luminous element by using the blocking change of the inductive reactance unit to the pulsating direct current, avoids the local temperature rise caused by heating due to the adoption of a resistor current limiting scheme, and improves the circuit safety.

Description

LED drive circuit and LED straight tube lamp

Technical Field

The application relates to the technical field of illumination, in particular to an LED driving circuit and an LED straight tube lamp.

Background

Fluorescent lamps are the most commonly used lighting tools in offices and residences, and traditional fluorescent lamps generally adopt fluorescent lamps, so that the fluorescent lamps are gradually replaced by LED lamps along with the continuous maturation of LED technology due to the advantages of energy conservation, environmental protection and the like.

Patent publication No. CN104595762A discloses an LED lamp that can be used to replace an electronic fluorescent lamp.

When the luminous state of the LED lamp beads is adjusted, the conventional thinking is that resistors with different sizes are connected in series when the LED lamp beads are powered on, the luminous state of the LED lamp beads is changed through the switching change of the resistance values of the resistors connected in series, the resistance can continuously heat due to the adjustment mode, the temperature is increased, the safety is reduced, and the service life of the whole lamp is influenced.

Disclosure of utility model

In view of the above, it is necessary to provide an LED driving circuit and an LED straight tube lamp.

The LED driving circuit comprises a rectifying unit for supplying power to a light-emitting element, wherein the rectifying unit is used for converting alternating current into direct current, a plurality of inductive reactance units which are connected in parallel and have different inductive reactance values are arranged between the rectifying unit and the light-emitting element, and a change-over switch for communicating one of the inductive reactance units is arranged between the rectifying unit and the light-emitting element.

The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.

Optionally, the inductance unit is an inductance.

Optionally, the light emitting element includes a first lamp bead and a second lamp bead connected in parallel and having different color temperatures.

Optionally, the method comprises the following steps: and a non-return diode arranged between the rectifying unit and the light-emitting element.

The application also provides an LED straight tube lamp, which comprises a tube body, a light-emitting element arranged in the tube body and an LED driving power supply arranged at the end part of the tube body, wherein the LED driving circuit is arranged in the driving power supply;

The rectifying unit comprises a first rectifying unit and a second rectifying unit, four input ends are integrally formed, and the LED straight tube lamp is provided with four lamp pins which are respectively connected to the four input ends.

Optionally, the LED driving circuit includes: and a high-voltage trigger element connected in series with the change-over switch, wherein the trigger voltage of the high-voltage trigger element is configured to trigger conduction only when the first rectifying unit and the second rectifying unit are simultaneously powered on.

Optionally, the trigger voltage of the high-voltage trigger element is greater than or equal to 500V.

Optionally, a first analog filament circuit is connected in parallel between the two input ends of the first rectifying unit;

And a second analog filament circuit is connected in parallel between the two input ends of the second rectifying unit.

Optionally, the first analog filament circuit is a first RC parallel circuit, and the second analog filament circuit is a second RC parallel circuit.

The LED driving circuit and the LED straight tube lamp have at least the following technical effects:

the application changes the luminous flux of the luminous element by using the blocking change of the inductive reactance unit to the pulsating direct current, avoids the heating caused by the heating due to the adoption of the resistance current limiting, and improves the circuit safety.

Drawings

FIG. 1 is a schematic diagram of a model structure of an LED driving circuit according to an embodiment of the application;

FIG. 2 is a schematic diagram of a model structure of an LED driving circuit according to an embodiment of the application;

FIG. 3 is a schematic diagram of an LED straight tube lamp according to an embodiment of the present application;

FIG. 4 is a schematic circuit diagram of an LED driving circuit according to an embodiment of the present application;

Reference numerals in the drawings are described as follows:

100. A rectifying unit; 110. a first rectifying unit; 120. a second rectifying unit; 130. a first analog filament circuit; 140. a second analog filament circuit;

200. A change-over switch; 300. an inductive reactance unit; 400. a light emitting element; 500. a high voltage trigger element; 600. LED straight tube lamp.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It will be understood that when an element is referred to as being "coupled" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implicitly indicating the number, order of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present disclosure, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such article or apparatus.

Referring to fig. 1, an LED driving circuit according to an embodiment of the present application includes a rectifying unit 100, a switch 200, an inductive reactance unit 300, and a light emitting element 400. The rectifying unit 100 converts alternating current into direct current for supplying power to the light emitting element 400. The rectifying unit 100 outputs pulsating direct current to energize the light emitting element 400, for example, using a full wave rectifying bridge.

A plurality of inductance units 300 which are connected in parallel and have different inductance values, and a switch 200 for connecting one of the inductance units 300 are provided between the rectifying unit 100 and the light emitting element 400. The inductance unit 300 is specifically an inductance with different inductance values, such as the inductance L1 and the inductance L2 in fig. 4.

It can be appreciated that if the above-mentioned inductive reactance units 300 with different inductive reactance values are resistors with different resistance values, the power consumption of the circuit is concentrated on the resistors during switching, which causes a high temperature at the place, which is not beneficial to the safety of the circuit and affects the service life of the whole lamp.

In this embodiment, the blocking change of the inductive reactance unit 300 to the pulsating direct current is utilized, so as to change the luminous flux of the light emitting element 400, and avoid heating caused by adopting a series resistance current limiting scheme, thereby improving the circuit safety. It is understood that the light of the light emitting element 400 will be more stable with the use of the reactance unit having a larger reactance value.

Referring to fig. 2 to 4, the rectifying unit 100 includes a first rectifying unit 110 (BD 1) and a second rectifying unit 120 (BD 2), and four input terminals, that is, an input terminal X1 and an input terminal X2 belonging to the first rectifying unit 110, and an input terminal X3 and an input terminal X4 belonging to the second rectifying unit 120, are integrally formed. A first analog filament circuit 130 is connected in parallel between the input terminal X1 and the input terminal X2 of the first rectifying unit 110. A second analog filament circuit 140 is connected in parallel between the input terminal X3 and the input terminal X4 of the second rectifying unit 120. The first analog filament circuit 130 is a first RC parallel circuit, and the second analog filament circuit 140 is a second RC parallel circuit. Specifically, the first RC parallel circuit is composed of a resistor R3, a resistor R4, a capacitor C3, and a capacitor C4, and the second RC parallel circuit is composed of a resistor R1, a resistor R2, a capacitor C1, and a capacitor C2.

Referring to fig. 3, in an embodiment of the present application, an LED straight tube lamp 600 is provided, which can be used to replace a fluorescent tube under an electronic ballast, and the LED straight tube lamp includes a tube body, a light emitting element disposed in the tube body, and an LED driving power supply disposed at an end of the tube body. The driving power supply is internally provided with the LED driving circuit provided by the embodiments of the application. The LED straight tube lamp 600 has four lamp pins connected to four input terminals, respectively. The lamp pins P1 and P2 are arranged at one end of the tube body, and the lamp pins P3 and P4 are arranged at the other end of the tube body.

The LED driving circuit includes a high voltage trigger element 500 (DY) connected in series with the switch 200, for example, a high voltage trigger diode is selected, and the trigger voltage of the high voltage trigger element 500 is configured to trigger conduction only when the first rectifying unit 110 and the second rectifying unit 120 are simultaneously powered on. Specifically, the trigger voltage of the high voltage trigger element 500 is 500V or more, for example, 500 to 700V.

It is understood that when the LED driving circuit is disposed in the LED straight tube lamp, the lamp strip is disposed in the middle of the LED straight tube lamp, and the LED driving power sources are disposed at two opposite ends. For example, the LED driving power source may be a component having one end or both ends. When the high-voltage trigger element is installed, the high-voltage trigger element is conducted only under the condition that both ends are simultaneously electrified, namely, after a circuit on one side is connected, the light-emitting element cannot be electrified, and the safety of operators can be ensured when the high-voltage trigger element is touched by mistake.

Referring to fig. 4, the light emitting element 400 includes a first lamp bead LEDA and a second lamp bead LEDB connected in parallel and having different color temperatures, and a capacitor C6 and a capacitor C5 are connected in parallel to the first lamp bead LEDA and the second lamp bead LEDB, respectively. The LED driving circuit is also provided with a switch K2 for switching and lighting the first lamp bead LEDA and/or the second lamp bead LEDB, so as to realize the color temperature adjustment of the light emitting element. Between the rectifying unit 100 and the light emitting element 400, non-return diodes DX1, DX2, DX3 and DX4 are further provided. The non-return diodes are arranged at the direct current output ends of the rectifying units, and the positive poles of the non-return diodes are correspondingly connected with the high-voltage direct current output ends, and the negative poles of the non-return diodes are correspondingly connected with the low-voltage direct current output ends. The embodiments of the application provide an LED straight tube lamp capable of adjusting the lighting state of a lighting element and changing the color temperature of the LED straight tube lamp.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.

Claims (9)

1. The LED driving circuit is characterized by comprising a rectifying unit for supplying power to a light-emitting element, wherein the rectifying unit is used for converting alternating current into direct current, a plurality of inductive reactance units which are connected in parallel and have different inductive reactance values and a change-over switch for communicating one of the inductive reactance units are arranged between the rectifying unit and the light-emitting element.
2. 2. The LED driving circuit of claim 1, wherein the inductive reactance unit is an inductance.
3. 3. The LED driving circuit according to claim 1, wherein the light emitting element includes a first lamp bead and a second lamp bead which are connected in parallel and have different color temperatures.
4. 4. The LED driving circuit according to claim 1, comprising: and a non-return diode arranged between the rectifying unit and the light-emitting element.
5. An LED straight tube lamp comprising a tube body, a light emitting element provided in the tube body, and an LED driving power supply provided at an end of the tube body, wherein the LED driving circuit according to any one of claims 1 to 4 is provided in the driving power supply;

   The rectifying unit comprises a first rectifying unit and a second rectifying unit, four input ends are integrally formed, and the LED straight tube lamp is provided with four lamp pins which are respectively connected to the four input ends.
6. 6. The LED straight tube lamp of claim 5, wherein the LED driving circuit comprises: and a high-voltage trigger element connected in series with the change-over switch, wherein the trigger voltage of the high-voltage trigger element is configured to trigger conduction only when the first rectifying unit and the second rectifying unit are simultaneously powered on.
7. 7. The LED straight tube lamp according to claim 6, wherein the trigger voltage of the high voltage trigger element is 500V or more.
8. 8. The LED straight tube lamp of claim 5, wherein a first analog filament circuit is connected in parallel between the two input ends of the first rectifying unit;

   And a second analog filament circuit is connected in parallel between the two input ends of the second rectifying unit.
9. 9. The LED straight tube lamp of claim 8, wherein the first analog filament circuit is a first RC parallel circuit and the second analog filament circuit is a second RC parallel circuit.