CN212381440U

CN212381440U - Novel low-cost LED current-limiting circuit

Info

Publication number: CN212381440U
Application number: CN202021456507.5U
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 novel low-cost LED current-limiting circuit, include: the LED lamp comprises a power supply, a plurality of diodes (LEDs) and constant current diodes, and is characterized in that the power supply is connected with the diodes (LEDs), the diodes (LEDs) are connected with the constant current diodes in series, the power supply provides high-voltage direct current, the diodes (LEDs) are visual LEDs or/and ultraviolet LEDs, and the number of the constant current diodes is 1-2.

Description

Novel low-cost LED current-limiting circuit

Technical Field

The utility model relates to an electricity field, more specifically involves a novel 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 novel low-cost LED current-limiting circuit can reduce LED current-limiting circuit's cost when inputing high voltage to guarantee the high performance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel 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 novel low cost LED current limiting circuit comprising: the LED lamp comprises a power supply, a plurality of diodes (LEDs) and constant current diodes, and is characterized in that the power supply is connected with the diodes (LEDs), the diodes (LEDs) are connected with the constant current diodes in series, the power supply provides high-voltage direct current, the diodes (LEDs) are visual LEDs or/and ultraviolet LEDs, and the number of the constant current diodes is 1-2.

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.

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.

Further, the diode LED is preferably an ultraviolet LED, and has higher performance.

Furthermore, the voltage of the ultraviolet LED is 7-9V, and the current requirement is 100 mA.

Further, when the diode LED is a visible LED or an ultraviolet LED, the number of the constant current diodes is 1, and when the diode LED is a visible LED or an ultraviolet LED, the number of the constant current diodes is 2.

Furthermore, the constant current of the constant current diode is 38-42mA, and the power is 475-525 mW.

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 visible LED or/and the ultraviolet LED can be well met by adopting a mode of 1-2 constant current diodes in order to reduce the cost; especially, for the ultraviolet LED, the voltage saving is high, the requirement on the current is high, the current limiting precision of the constant current diode is higher than that of a resistor, the cost is a little higher, but the cost is much lower than that of a chip, so the current limiting requirement of the ultraviolet LED on high precision, high performance and low cost can be better met.

Further, as shown in fig. 1, the power supply provides 12V dc power to the LED5, the LED5 is an ultraviolet LED, pin 1 of the LED5 is an anode, pin 2 is a cathode, pin 3 is grounded, pin 2 of the LED5 is connected to pin 2 of the constant current diode D1, pin 1 and pin 3 of the constant current diode D1 are grounded, and the constant current diode D1 plays a role in high-precision current limiting.

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 pin 2 of the constant current diode D2, so as to perform a high-precision current limiting function, and the

pins

1 and 3 of the constant current diode D2 are grounded; the pin 1 of the LED5 is the positive electrode, the pin 2 is the negative electrode, the pin 3 is grounded, the pin 2 of the LED5 is connected with the pin 2 of the constant current diode D1, the pin 1 and the pin 3 of the constant current diode D1 are grounded, and the constant current diode D1 plays a role in high-precision current limiting.

Drawings

Fig. 1 is the utility model discloses a novel low-cost LED current-limiting circuit.

Fig. 2 is another novel low-cost LED current limiting circuit of 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 novel low-cost LED current limiting circuit, as shown in fig. 1, includes: the LED lamp comprises a power supply, a plurality of diodes (LEDs) and constant current diodes, and is characterized in that the power supply is connected with the diodes (LEDs), the diodes (LEDs) are connected with the constant current diodes in series, the power supply provides high-voltage direct current, the diodes (LEDs) are visual LEDs or/and ultraviolet LEDs, and the number of the constant current diodes is 1-2.

The power supply provides a 12V direct current power supply, the number of the ultraviolet LEDs is 1, the number of the constant current diodes is 1, the voltage of the ultraviolet LEDs is 8V, the current requirement is 100mA, the constant current of the constant current diodes is 40mA, and the power is 500 mW.

The power supply supplies 12V direct current to the LED5, the LED5 is an ultraviolet LED, a pin 1 of the LED5 is an anode, a pin 2 of the LED5 is a cathode, and a pin 3 of the LED is grounded, the pin 2 of the LED5 is connected with a pin 2 of the constant current diode D1, the pin 1 and the pin 3 of the constant current diode D1 are grounded, and the constant current diode D1 plays a role in high-precision current limiting.

Example 2:

a novel low-cost LED current limiting circuit, as shown in fig. 2, includes: the LED lamp comprises a power supply, a plurality of diodes (LEDs) and constant current diodes, and is characterized in that the power supply is connected with the diodes (LEDs), the diodes (LEDs) are connected with the constant current diodes in series, the power supply provides high-voltage direct current, the diodes (LEDs) are visual LEDs or/and ultraviolet LEDs, and the number of the constant current diodes is 1-2.

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

The number of the visible LEDs is 2, the number of the ultraviolet LEDs is 1, the voltage of the ultraviolet LEDs is 8V, and the current requirement is 100 mA.

The number of the constant current diodes is 2, the constant current of the constant current diodes is 40mA, and the power of the constant current diodes is 5005 mW.

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 a pin 2 of the constant current diode D2, the high-precision current limiting effect is achieved, and a pin 1 and a pin 3 of the constant current diode D2 are grounded; the pin 1 of the LED5 is the positive electrode, the pin 2 is the negative electrode, the pin 3 is grounded, the pin 2 of the LED5 is connected with the pin 2 of the constant current diode D1, the pin 1 and the pin 3 of the constant current diode D1 are grounded, and the constant current diode D1 plays a role in high-precision current limiting.

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 novel low cost LED current limiting circuit comprising: the LED lamp comprises a power supply, a plurality of diodes (LEDs) and constant current diodes, and is characterized in that the power supply is connected with the diodes (LEDs), the diodes (LEDs) are connected with the constant current diodes in series, the power supply provides high-voltage direct current, the diodes (LEDs) are visual LEDs or/and ultraviolet LEDs, and the number of the constant current diodes is 1-2.

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

3. The novel low-cost LED current-limiting circuit according to claim 1, wherein the connection between the visible LEDs is in series.

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

6. The novel low-cost LED current-limiting circuit according to claim 5, wherein the number of visible LEDs is 1-3 and the number of ultraviolet LEDs is 1.

7. The novel low-cost LED current-limiting circuit of claim 1, wherein the diode LED is an ultraviolet LED.

8. The novel low-cost LED current-limiting circuit as claimed in claim 7, wherein the UV LED has a voltage regulation of 7-9V and a current requirement of 100 mA.

9. The novel low-cost LED current-limiting circuit according to claim 1, wherein the number of the diodes LED is 1 if the diodes LED are visible LED or ultraviolet LED, and the number of the diodes LED is 2 if the diodes LED are visible LED or ultraviolet LED.

10. The novel low-cost LED current-limiting circuit as claimed in claim 1, wherein the constant current of the constant current diode is 38-42mA, and the power is 475-525 mW.