CN222424056U

CN222424056U - A power supply circuit for LED lamp

Info

Publication number: CN222424056U
Application number: CN202420903479.9U
Authority: CN
Inventors: 胡运林
Original assignee: Nanjing Lingdong Shuzhi Technology Co ltd
Current assignee: Nanjing Lingdong Shuzhi Technology Co ltd
Priority date: 2024-04-28
Filing date: 2024-04-28
Publication date: 2025-01-28
Anticipated expiration: 2034-04-28

Abstract

The present application discloses a power supply circuit for an LED lamp. The technical solution provided by the present application directly draws power for the LED lamp from the battery end without passing through a diode to reduce voltage drop. A switching element with a relatively small internal resistance is then used as a circuit switch for the LED. When the LED lamp needs to be turned on, the switching element is controlled to be turned on. When power is drawn through the circuit structure provided by the present application, even when the battery is low and the battery voltage is low, there will be no voltage drop like in a traditional power supply circuit, thus avoiding the disadvantage that the LED lamp cannot be lit when the battery power is low, and can effectively extend the service life limit of the LED.

Description

Circuit is got to LED lamp

Technical Field

The application relates to the technical field of intelligent household equipment, in particular to an LED lamp power-taking circuit.

Background

Many wireless products on the market at present often carry a plurality of batteries to supply power, the circuit needs to be provided with diodes to be respectively isolated and then supply power to the system, the LED indicator lamp is generally interacted with a user, the general design method in the industry is to directly power the LED lamp from the cathode end of the diode, the circuit structure is as shown in fig. 1, the consistency of the power supply voltage of a chip and the power supply voltage of an LED can be ensured, the power loss of the LED lamp is avoided under the condition of no lighting, and the low-power consumption requirement is met. However, in the practical application process, the LED adopting the power taking structure increases along with the continuous use of the product, so that the phenomenon of light emitting failure is easy to occur, and the use experience of a user is affected.

Disclosure of utility model

The application discloses an LED lamp power-taking circuit which is used for solving the technical problem that the existing LED lamp power-taking circuit structure is easy to cause the phenomenon of luminous failure.

In order to solve the technical problems, the first aspect of the application provides an LED lamp power-taking circuit, which comprises an LED element, a low-internal-resistance switch element and an MCU module, wherein the MCU module is connected with a control end of the low-internal-resistance switch element and is used for controlling the on-off of the low-internal-resistance switch element;

The LED element is connected with the low-internal-resistance switch element in series to form a light-emitting loop with a serial structure;

One end of the luminous loop is a grounding end, and the other end of the luminous loop is an electricity taking end which is electrically connected with the multi-battery power supply module, wherein the access position of the electricity taking end is positioned between the battery anode and the diode anode of one group of battery loops in the multi-battery power supply module.

Optionally, the series connection sequence of the light-emitting loop is that the power-taking end, the LED element, the low internal resistance switch element and the grounding end.

Optionally, the series connection sequence of the light-emitting loop is that the power-taking end, the low internal resistance switch element, the LED element and the grounding end.

Optionally, the light-emitting circuit further comprises a first current limiting resistor;

The first current limiting resistor is connected in series with the anode of the LED element.

Optionally, the MCU module further comprises a pull-down resistor and a second current limiting resistor, wherein the pull-down resistor and the second current limiting resistor are arranged between the MCU module and the low internal resistance switching element.

Optionally, the low internal resistance switching element comprises a MOS tube or a triode.

Optionally, the light-emitting circuit further comprises a switch protection element for protecting the low internal resistance switch element.

Optionally, the switch protection element comprises an ESD tube.

From the above technical scheme, the application has the following advantages:

According to the technical scheme provided by the application, the power supply of the LED lamp is directly powered from the battery end without passing through a diode, so that the voltage drop is reduced, then the switching element with smaller internal resistance is used as a circuit switch of the LED, and is controlled to be conducted when the LED lamp is required to be started.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic diagram of a conventional LED lamp power circuit;

Fig. 2 is a schematic structural diagram of an LED lamp power-taking circuit according to an embodiment of the present application;

Wherein, the reference numerals include:

R1 and R2 are first current limiting resistors, D3 is an LED element, D5 and D6 are ESD tubes, Q1 and Q2 are NMOS tubes, R4 and R7 are pull-down resistors, and R5 and R6 are second current limiting resistors.

Detailed Description

Through intensive researches on defect phenomena existing in the prior art, the reason for the phenomena is found that as the continuous use time of the product is increased, the battery electric quantity of the product is reduced, the voltage obtained by the LED lamp is lower after the voltage of the battery is reduced through the diode, for example, the LED on voltage is assumed to be 2.2v, but the voltage drop of the diode is at least 0.3v, the battery voltage is required to be more than 2.5v, the LED indicator lamp can be lightened, and once the battery voltage is lower than 2.5v, the LED cannot be lightened any more, so that the product can work normally, but the LED indicator lamp is not lightened and the luminous failure condition seriously affects the user experience.

In view of the above, the embodiment of the application discloses an LED lamp power-taking circuit for solving the technical problem that the existing LED lamp power-taking circuit structure is easy to cause the phenomenon of luminous failure.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intervening medium, or may be in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 2, the circuit for extracting an LED lamp provided in the embodiment of the present application includes an LED element, a low internal resistance switching element, and an MCU module, where the MCU module is connected to a control end of the low internal resistance switching element and is configured to control on/off of the low internal resistance switching element;

It should be noted that, since the multi-battery power module shown in the figure includes two parallel battery circuits, in some embodiments, more battery circuits may be provided, where the multiple batteries may be isolated by the diodes and spatially connected in parallel, so that the corresponding light-emitting circuits are also two, and since the two light-emitting circuits have substantially the same composition, the present embodiment only uses one of them as an example.

Firstly, an LED element is connected in series with a low internal resistance switch element to form a light-emitting loop with a serial structure, one end of the light-emitting loop is grounded, the other end of the light-emitting loop is connected between the battery anode and the diode anode of one group of battery loops, so that a LED lamp power supply directly takes electricity from the battery end without passing through the diode, voltage drop is reduced, then an internal resistance smaller switch element is used as a circuit switch of the LED, such as an NMOS tube or an NPN triode electronic switch or other analog switches, and available models are AH150N03, AH60N04, AH85N03, and the like, and when the LED lamp needs to be started, a MOS tube and the like are turned on, and because the MOS tube internal resistance is very small, the LED current is mA level, and the voltage VDS between the drain electrode and the source electrode is approximately equal to 0V, so that when the battery voltage is lower, the lighting duration of the LED is prolonged with extremely low cost.

Further, the power-taking circuit of the LED lamp further comprises a first current-limiting resistor;

The first current limiting resistor is connected in series with the anode of the LED element to protect the LED element.

Optionally, the light-emitting circuit further comprises a switch protection element for protecting the low-internal-resistance switch element, wherein the switch protection element can be an ESD (electro-static discharge) tube.

Then the GPIO port of MCU connects a pull-down resistor, and then connects to the grid of the switch tube NMOS through a current limiting resistor, used for controlling the on and off of the mos tube, in order to protect the NMOS tube from electrostatic ESD breakdown at the same time, this embodiment also adds the ESD tube on the drain electrode of the mos tube.

The above detailed description of the LED lamp circuit provided by the present application is provided, and those skilled in the art will be able to change the specific implementation and application range according to the ideas of the embodiments of the present application, so the disclosure should not be construed as limiting the present application.

Claims

1. The LED lamp power-taking circuit is characterized by comprising an LED element, a low-internal-resistance switch element and an MCU module, wherein the MCU module is connected with a control end of the low-internal-resistance switch element and used for controlling the on-off of the low-internal-resistance switch element;

2. The LED lamp power extraction circuit of claim 1, wherein said light emitting circuit is connected in series in the order of said power extraction terminal, said LED element, said low internal resistance switching element, and said ground terminal.

3. The LED lamp circuit of claim 1, wherein the series connection of the light emitting circuit is in the order of the power-on terminal, the low internal resistance switching element, the LED element and the ground terminal.

4. The LED lamp extraction circuit of claim 1, wherein the light emitting circuit further comprises a first current limiting resistor;

5. The LED lamp circuit of claim 1, further comprising a pull-down resistor and a second current limiting resistor, wherein the pull-down resistor and the second current limiting resistor are disposed between the MCU module and the low internal resistance switching element.

6. The LED lamp circuit of claim 1, wherein the low internal resistance switching element comprises a MOS tube or a triode.

7. The LED lamp circuit of claim 1, wherein the light emitting circuit further comprises a switch protection element for protecting the low internal resistance switch element.

8. The LED lamp circuit of claim 7, wherein the switch protection element comprises an ESD tube.