CN212381441U

CN212381441U - Novel constant current circuit of LED lamp

Info

Publication number: CN212381441U
Application number: CN202021456556.9U
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 constant current circuit of LED lamp, include: the LED lamp comprises a power supply, a filter circuit, a constant-current integrated chip, a voltage dividing circuit and a reference current setting circuit, wherein the filter circuit is composed of a first filter circuit and a second filter circuit, the power supply is connected with the first filter circuit, the first filter circuit is connected with the constant-current integrated chip, the constant-current integrated chip is connected with the second filter circuit, the reference current setting circuit and the voltage dividing circuit, the second filter circuit is connected with an anode interface, the anode interface is connected with the anode of the LED lamp, the reference current setting circuit is connected with a cathode interface, and the cathode interface is connected with the cathode of the LED lamp.

Description

Novel constant current circuit of LED lamp

Technical Field

The utility model relates to an electricity field, more specifically relates to a novel constant current circuit of LED lamp.

Background

The LED lamp is a solid semiconductor component, which uses current to flow to a semiconductor p-n junction coupling point in a forward direction, and then combines two carriers, namely negatively charged electrons and positively charged holes, separated from the semiconductor to generate photon emission, and different types of LEDs can emit Light with different wavelengths from infrared to blue, and from violet to ultraviolet. 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.

However, due to the limitation and influence of the process capability of manufacturing LED lamps, the voltage of LED lamps produced by different batches or different manufacturers fluctuates, for example, the voltage of LED lamps produced by the previous batch is 7V, the voltage of LED lamps produced by the next batch may be 9V, and in an application product, such as a router or a mobile phone, LED lamps produced by different batches or different manufacturers may be used simultaneously, which may cause the LED lamps to emit light with different brightness, affect the appearance, and affect the quality and the service life of the LED lamps.

However, in the prior art (for example, CN203202765U, CN203349034U), the constant current circuit of the LED lamp is concerned with the problem that the luminances of the LED lamp strip or strip, such as the first lamp and the tail lamp, are inconsistent, and the brightness inconsistency of the lamp strip or strip is caused by the resistance of the copper foil wire, which is increased along with the length of the lamp strip, the larger the resistance, and the lower the voltage at the tail end of the lamp strip or strip, and has the characteristic that the lamp strip or strip is very long. Nobody pay more attention to the problem that the number of LED lamps is small in one product, but the brightness of the LED lamps is inconsistent, and the technical problem needs to be further improved for high-tech or fine products.

Therefore, the utility model provides a novel constant current circuit of LED lamp can solve above-mentioned technical problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel constant current circuit of LED lamp can guarantee the luminance unanimity of the LED lamp of different batches or different producer production to improve the quality and the life of LED lamp.

A constant current circuit of a novel LED lamp comprises: the LED lamp comprises a power supply, a filter circuit, a constant-current integrated chip, a voltage dividing circuit and a reference current setting circuit, wherein the filter circuit is composed of a first filter circuit and a second filter circuit, the power supply is connected with the first filter circuit, the first filter circuit is connected with the constant-current integrated chip, the constant-current integrated chip is connected with the second filter circuit, the reference current setting circuit and the voltage dividing circuit, the second filter circuit is connected with an anode interface, the anode interface is connected with the anode of the LED lamp, the reference current setting circuit is connected with a cathode interface, and the cathode interface is connected with the cathode of the LED lamp.

Further, the number of the LED lamps is 1-10, and preferably, the number of the LED lamps is 1-5.

Further, the power supply comprises a first power supply and a second power supply, and the first power supply and the second power supply both provide 12V direct current power supplies.

Furthermore, a first power supply provides a 12V direct current power supply to a first filter circuit, the first filter circuit consists of two capacitors connected in parallel, has the functions of filtering, energy storage and voltage stabilization, and is then connected with a constant current integrated chip, the constant current integrated chip has the functions of constant current and short circuit protection, and outputs pulse waveforms and adjusts duty ratio to be suitable for the voltage without load, and then is connected with an anode interface after the filtering, energy storage and voltage stabilization of a second filter circuit to be suitable for the LED lamps with different voltages.

Furthermore, when the constant current integrated chip outputs a pulse waveform, the constant current integrated chip is also connected with a capacitor, and the capacitor has the functions of positive potential, starting and isolating the empty alternating current from the direct current.

Further, the reference current setting circuit comprises a pull-down resistor which has the function of setting the reference current.

Furthermore, the voltage division circuit has the function of protecting the constant-current integrated chip, the voltage division circuit comprises a second power supply and two resistors, and the voltage division circuit can reduce the potential, so that the function of protecting the constant-current integrated chip is achieved.

Further, as shown in fig. 1, the power supply provides 12V dc power to the first filter circuit composed of capacitors C4 and C5, and after filtering, energy storage and voltage stabilization, the first filter circuit is connected to the 5 pin of the constant current integrated chip U1, the 2 pin is grounded, the 6 pin outputs pulse waveform and adjusts duty ratio, and is connected to the capacitor C1, the capacitor C1 has positive potential, starting function and functions of isolating ac and dc, the 6 pin is also connected to the inductor L3, the inductor L3 has an energy storage function, and the inductor L539l 3 is connected to the second filter circuit composed of capacitors C6 and C7 and is connected to the positive terminal TP 3; the pin 3 of the constant current integrated chip U1 is connected with a pull-down resistor R19, the pull-down resistor R19 is grounded at the same time, plays a role in setting reference current and is connected with a negative electrode interface TP 4; the 4 feet of the constant current integrated chip U1 are connected with a voltage division circuit, the voltage division circuit consists of a 12V direct current power supply, a resistor R20 and a resistor R1, the other end of the resistor R1 is grounded, and the voltage division circuit can reduce the potential, so that the constant current integrated chip is protected.

Drawings

Fig. 1 is a circuit diagram of the constant current circuit of the LED lamp 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 constant current circuit of a novel LED lamp is shown in figure 1 and comprises: the LED lamp comprises a power supply, a filter circuit, a constant-current integrated chip, a voltage dividing circuit and a reference current setting circuit, wherein the filter circuit is composed of a first filter circuit and a second filter circuit, the power supply is connected with the first filter circuit, the first filter circuit is connected with the constant-current integrated chip, the constant-current integrated chip is connected with the second filter circuit, the reference current setting circuit and the voltage dividing circuit, the second filter circuit is connected with an anode interface, the anode interface is connected with the anode of the LED lamp, the reference current setting circuit is connected with a cathode interface, the cathode interface is connected with the cathode of the LED lamp, and the number of the LED lamps is 3.

The power supply provides 12V direct current power to a first filter circuit consisting of capacitors C4 and C5, after filtering, energy storage and voltage stabilization are carried out, the filter circuit is connected with a pin 5 of a constant current integrated chip U1, a pin 2 is grounded, a pin 6 outputs pulse waveforms and adjusts duty ratio, the filter circuit is connected with a capacitor C1, the capacitor C1 has positive potential, a starting function and a function of isolating direct current from alternating current, the pin 6 is also connected with an inductor L3, the inductor L3 has an energy storage function, and the inductor L3 is connected with a second filter circuit consisting of capacitors C6 and C7 and is connected with a positive electrode interface TP 3; the pin 3 of the constant current integrated chip U1 is connected with a pull-down resistor R19, the pull-down resistor R19 is grounded at the same time, plays a role in setting reference current and is connected with a negative electrode interface TP 4; the 4 feet of the constant current integrated chip U1 are connected with a voltage division circuit, the voltage division circuit consists of a 12V direct current power supply, a resistor R20 and a resistor R1, the other end of the resistor R1 is grounded, and the voltage division circuit can reduce the potential, so that the constant current integrated chip is protected.

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 constant current circuit of a novel LED lamp is characterized by comprising: the LED lamp comprises a power supply, a filter circuit, a constant-current integrated chip, a voltage dividing circuit and a reference current setting circuit, wherein the filter circuit is composed of a first filter circuit and a second filter circuit, the power supply is connected with the first filter circuit, the first filter circuit is connected with the constant-current integrated chip, the constant-current integrated chip is connected with the second filter circuit, the reference current setting circuit and the voltage dividing circuit, the second filter circuit is connected with an anode interface, the anode interface is connected with the anode of the LED lamp, the reference current setting circuit is connected with a cathode interface, and the cathode interface is connected with the cathode of the LED lamp.

2. The constant current circuit of an LED lamp according to claim 1, wherein the number of the LED lamps is 1 to 10.

3. The constant current circuit of an LED lamp according to claim 2, wherein the number of the LED lamps is 1 to 5.

4. The constant current circuit of an LED lamp according to claim 1, wherein the power supply includes a first power supply and a second power supply, each of the first power supply and the second power supply providing a 12V dc power.

5. The constant current circuit of the LED lamp according to claim 1, wherein the first power supply supplies a 12V dc power to the first filter circuit, the first filter circuit is composed of two capacitors connected in parallel, the first filter circuit performs filtering, energy storage, and voltage stabilization, and then is connected to the constant current ic, which has a function of constant current and short circuit protection, and outputs a pulse waveform, adjusts a duty ratio to be suitable for an unnecessary load voltage, and then is connected to the positive interface after filtering, energy storage, and voltage stabilization by the second filter circuit.

6. The constant current circuit of the LED lamp according to claim 1, wherein the constant current ic chip is further connected to a capacitor having a positive potential, a start-up function, and a null ac dc blocking function when outputting the pulse waveform.

7. The constant current circuit of an LED lamp according to claim 1, wherein the reference current setting circuit includes a pull-down resistor having a function of setting the reference current.

8. The constant current circuit of an LED lamp according to claim 1, wherein the voltage divider circuit includes a second power supply and two resistors, and the voltage divider circuit can lower the potential and has a function of protecting the constant current ic chip.