CN212381435U

CN212381435U - Low-cost LED current-limiting circuit

Info

Publication number: CN212381435U
Application number: CN202021456548.4U
Authority: CN
Inventors: 江冠华; 周礼培
Original assignee: Jiangsu Jwt Electronics Shares Co ltd
Current assignee: Jiangsu Jwt Electronics Shares Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-01-19
Anticipated expiration: 2030-07-22

Abstract

The utility model provides a low-cost LED current-limiting circuit, include: the LED lamp comprises a power supply, a plurality of diodes and resistors, wherein the power supply is connected with the diodes, the diodes are connected in series with the resistors, the power supply provides high-voltage direct current, the diodes are visual LEDs or/and ultraviolet LEDs, the number of the resistors is more than 1, and the resistors are connected in parallel.

Description

Low-cost LED current-limiting circuit

Technical Field

The utility model relates to an electricity field, more specifically relates to a low-cost LED current-limiting circuit.

Background

The LED lamp has the characteristics of energy conservation, long service life, environmental protection, eyesight protection, high luminous efficiency and the like, and is widely applied. The LED lamps are of various types, and different types of LEDs can emit light with different wavelengths from infrared rays to blue light, purple light to ultraviolet rays and the like, so that visible light or ultraviolet sterilization is provided.

At present, because the voltage withstand requirement on each element is higher, or in order to improve the quality and the service life of the LED lamp, a chip is mostly adopted for current limiting, but the cost is higher, while in the prior art, the low-cost LED current limiting circuit is easy to burn out a resistor when high voltage is input, and the service life of the LED lamp is greatly reduced.

Therefore, the utility model provides a low-cost LED current-limiting circuit can reduce LED current-limiting circuit's cost when inputing the high voltage to guarantee the high performance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low-cost LED current-limiting circuit is applicable to visual LED lamp, reaches ultraviolet LED lamp, can reduce LED current-limiting circuit's cost when inputing the high voltage to guarantee the high performance.

A low cost LED current limiting circuit comprising: the LED lamp comprises a power supply, a plurality of diodes and resistors and is characterized in that the power supply is connected with the diodes, the diodes are connected with the resistors in series, the power supply provides high-voltage direct current, the diodes are visible LEDs or/and ultraviolet LEDs, the number of the resistors is more than 1, and the resistors are connected in parallel.

Further, the power supply provides 12V DC power.

Further, the connection mode among the visible LEDs is series connection.

Further, when the diode LED is a visible LED and an ultraviolet LED, the visible LED is connected in parallel with the ultraviolet LED.

Further, the diode LED is preferably a visible LED, and the performance is higher.

Furthermore, the number of the diodes LED is 1-4.

Furthermore, the number of the visible LEDs is 1-3, and the number of the ultraviolet LEDs is 1.

Furthermore, the number of the resistors is 2-3, and the resistance value of the resistor is 330 ohms or 500 ohms.

Further, the resistance value of the resistor is preferably 500 ohms.

Further, the principle of the present invention lies in that, in the prior art, a low-cost LED current limiting circuit uses a resistor in series with an LED lamp, when inputting high voltage, such as 12V dc current commonly used, the resistance of a resistor is 330 ohms or 500 ohms, the voltage of the visible LED lamp is 3V, and more importantly, the applicant notices that, due to the limitation of the production process, the LED lamp inevitably has the problem that a resistor cannot reach the current limiting function easily, which easily causes the resistor to burn out, and the service life of the LED lamp is greatly reduced. The chip current limiting is high in accuracy, but high in cost. The applicant finds that the fundamental reason is the phenomenon of large fluctuation of the LED lamp voltage caused by the LED lamp production process, and finds that the low-cost current limiting requirement of a visible LED or/and an ultraviolet LED, particularly the visible LED, and the performance requirement can be met by adopting a mode of connecting 2-3 resistors in parallel in order to reduce the cost.

Further, as shown in fig. 1, the power supply provides 12V dc power to the LED1, the LED1 is connected in series with the LED2, both the LED1 and the LED2 are visible LEDs, the pin 1 of the LED1 is an anode, the pin 2 of the LED1 is a cathode, the pin 1 of the LED2 is an anode, the pin 2 of the LED2 is a cathode, the pin 2 of the LED2 is connected to the resistors R1 and R2, the resistors R1 and R2 are connected in parallel to limit current, and the other ends of the resistors R1 and R2 are grounded.

Further, as shown in fig. 2, the power supply provides 12V dc power to the LED1 and the LED5, the LED1 and the LED2 are both visible LEDs, the LED5 is an ultraviolet LED, the LED1 is connected in series with the LED2, the LED5 is connected in parallel with the LED1 and the LED2, the pin 1 of the LED1 is an anode, the pin 2 is a cathode, the pin 1 of the LED2 is an anode, the pin 2 is a cathode, the pin 2 of the LED2 is connected with the resistors R1 and R2, the resistors R1 and R2 are connected in parallel to limit current, and the other ends of the resistors R1 and R2 are grounded; pin 1 of the LED5 is a positive electrode, pin 2 is a negative electrode, pin 3 is grounded, pin 2 of the LED5 is connected to the resistor R3, and the other end of the resistor R3 is grounded.

Drawings

Fig. 1 is a low-cost LED current limiting circuit of the present invention.

Fig. 2 is another low-cost LED current limiting circuit according to the present invention.

The drawings are described in detail below with reference to specific embodiments.

Detailed Description

The following examples are described to aid in the understanding of the present invention and are not, and should not be construed to limit the scope of the invention in any way.

In the following description, those skilled in the art will recognize that components may be described throughout this discussion as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including being integrated within a single system or component).

Furthermore, connections between components or systems within the figures are not intended to be limited to direct connections. Rather, data between these components may be modified, reformatted, or otherwise changed by the intermediate components. Additionally, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections.

Example 1:

a low cost LED current limiting circuit, as shown in fig. 1, comprising: the LED lamp comprises a power supply, a plurality of diodes and resistors, wherein the power supply is connected with the diodes, the diodes are connected in series with the resistors, the power supply provides high-voltage direct current, the diodes are visible LEDs, the number of the resistors is greater than 1, and the resistors are connected in parallel.

The power supply provides 12V direct current power supply, the number of diode LEDs is 2, the number of resistors is 2, and the resistance value of the resistor is 500 ohms.

The power supply supplies 12V direct current power to the LED1, the LED1 is connected with the LED2 in series, the LED1 and the LED2 are both visual LEDs, a pin 1 of the LED1 is an anode, a pin 2 of the LED1 is a cathode, a pin 1 of the LED2 is an anode, a pin 2 of the LED2 is a cathode, a pin 2 of the LED2 is connected with the resistors R1 and R2, the resistors R1 and R2 are connected in parallel to play a role in limiting current, and the other ends of the resistors R1 and R2 are grounded.

Example 2:

a low cost LED current limiting circuit, as shown in fig. 2, comprising: the LED lamp comprises a power supply, a plurality of diodes and resistors, wherein the power supply is connected with the diodes, the diodes are connected in series with the resistors, the power supply provides high-voltage direct current, the diodes are visible LEDs and ultraviolet LEDs, the number of the resistors is more than 1, and the resistors are connected in parallel.

The power supply provides 12V direct current power. The visible LEDs are connected in series, and the ultraviolet LEDs are connected in series. The visible LED is connected with the ultraviolet LED in parallel.

The number of the diode LEDs is 3, the number of the visible LEDs is 2, the number of the ultraviolet LEDs is 1, the number of the resistors is 3, and the resistance value of the resistors is 500 ohms.

The power supply provides 12V direct current power to the LED1 and the LED5, the LED1 and the LED2 are all visible LEDs, the LED5 is an ultraviolet LED, the LED1 is connected with the LED2 in series, the LED5 is connected with the LED1 and the LED2 in parallel, a pin 1 of the LED1 is an anode, a pin 2 of the LED2 is a cathode, a pin 1 of the LED2 is an anode, a pin 2 of the LED2 is connected with the resistors R1 and R2, the resistors R1 and R2 are connected in parallel to play a role in limiting current, and the other ends of the resistors R1 and R2 are grounded; pin 1 of the LED5 is a positive electrode, pin 2 is a negative electrode, pin 3 is grounded, pin 2 of the LED5 is connected to the resistor R3, and the other end of the resistor R3 is grounded.

While various aspects and embodiments have been disclosed herein, it will be apparent to those skilled in the art that other aspects and embodiments can be made without departing from the spirit of the disclosure, and that several modifications and improvements can be made without departing from the spirit of the disclosure. The various aspects and embodiments disclosed herein are presented by way of example only and are not intended to limit the present disclosure, which is to be controlled in the spirit and scope of the appended claims.

Claims

1. A low cost LED current limiting circuit comprising: the LED lamp comprises a power supply, a plurality of diodes and resistors and is characterized in that the power supply is connected with the diodes, the diodes are connected with the resistors in series, the power supply provides high-voltage direct current, the diodes are visible LEDs or/and ultraviolet LEDs, the number of the resistors is more than 1, and the resistors are connected in parallel.

2. The low-cost LED current-limiting circuit according to claim 1, wherein the power supply provides 12V dc power.

3. The low-cost LED current-limiting circuit according to claim 1, wherein the visible LEDs are connected in series.

4. The low-cost LED current-limiting circuit according to claim 1, wherein the diodes LEDs are a visible LED and an ultraviolet LED, and the visible LED is connected in parallel with the ultraviolet LED.

5. The low cost LED current limiting circuit of claim 1 wherein the diode LEDs are visible LEDs.

6. The low-cost LED current-limiting circuit according to claim 1, wherein the number of diodes LEDs is 1-4.

7. The low-cost LED current-limiting circuit according to claim 6, wherein the number of visible LEDs is 1-3 and the number of ultraviolet LEDs is 1.

8. The low-cost LED current-limiting circuit according to claim 1, wherein the number of the resistors is 2-3, and the resistance of the resistor is 330 ohms or 500 ohms.

9. The low cost LED current limiting circuit of claim 7 wherein the resistor is preferably 500 ohms.