CN214256690U

CN214256690U - Multichannel led drive circuit

Info

Publication number: CN214256690U
Application number: CN202021755096.XU
Authority: CN
Inventors: 罗丹; 石佳怡; 李振盛; 莫胜胜; 徐群人
Original assignee: Lijiang College Of Guangxi Normal University; Guangxi Normal University
Current assignee: Lijiang College Of Guangxi Normal University; Guangxi Normal University
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-09-21
Anticipated expiration: 2030-08-19

Abstract

The utility model discloses a multi-channel LED driving circuit, belonging to the technical field of electronic circuits, comprising a switch circuit, a plurality of LED array circuits, the plurality of LED array circuits being connected in parallel with the switch circuit, and the LED array circuit comprising a resonance circuit and a rectifier circuit I and a rectifier circuit II, the rectifier circuit I and the rectifier circuit II are both connected to the resonant circuit, and the rectifier circuit I and the rectifier circuit II are both connected to the LED lamp beads in series. The utility model reduces the traditional circuit converters and other devices, greatly simplifies the circuit structure, and makes the cost lower. When the SRC is used as an operation switch, the frequency of the variable frequency constant current source is lower than half of the resonance frequency, so as to ensure reliability. and an adjustable constant current power supply capable of operating in an open loop configuration.

Description

Multichannel led drive circuit

Technical Field

The utility model relates to an electronic circuit technical field especially relates to a multichannel led drive circuit.

Background

Due to the advantages of environmental protection, long service life, high photoelectric efficiency and the like, the led is rapidly developed in various industries in recent years. With the continuous improvement of led luminous efficiency and the gradual reduction of price, the development and research of high-power ultrahigh-brightness white light led has become the main direction. The simultaneous illumination of multiple paths of LEDs is being applied to occasions such as streets, tunnels, subways and the like, and is receiving wide attention in the world. Therefore, the design of the driving circuit with high power led also becomes a hot spot.

led driving circuits can be classified into linear structures, capacitive switch structures, and inductive switch structures. The linear regulator in the linear structure mainly comprises a circuit structure of a low-voltage regulator, and the circuit can only realize step-down driving and has low efficiency under certain application conditions. The charge pump in the capacitive switch structure is also called a switch capacitive DC/DC converter, and the charge pump circuit operates by means of charge transfer. However, the power conversion efficiency is reduced as the input voltage is increased, because the driving output voltage of the charge pump structure is generally low, when the load is a plurality of led, the led can only adopt a series-parallel connection mode, and the traditional circuit cannot respectively regulate the current of each led branch. Also, since the led is sensitive to temperature, even leds from the same package often show different parameters due to the unstable parameters during production. Therefore, led usually requires a reliable driving circuit to provide a constant value for the current to ensure the led's light emission level.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multichannel led drive circuit, it is complicated to solve current led drive circuit structure, and the current that provides is unstable technical problem.

The utility model provides a multichannel led drive circuit, includes switch circuit, a plurality of led array circuit, and a plurality of led array circuit is parallelly connected and switch circuit is connected, and led array circuit includes resonant circuit, rectifier circuit I and rectifier circuit II all are connected with resonant circuit, rectifier circuit I and rectifier circuit II all are connected with the led lamp pearl of establishing ties.

Further, the switch circuit comprises mos transistors Q1 and Q2, diodes D1 and D2 and capacitors C1 and C2, wherein an input end of the diode D1 is connected with a source electrode of the mos transistor Q1, an output end of the diode D1 is connected with a drain electrode of the mos transistor Q1, an input end of the diode D2 is connected with a source electrode of the mos transistor Q2, an output end of the diode D2 is connected with a drain electrode of the mos transistor Q2, a source electrode of the mos transistor Q1 is connected with a drain electrode of the mos transistor Q2, the capacitors C1 and C2 are connected in series, an anode of the capacitor C1 is connected with a drain electrode of the mos transistor Q1 and an anode of a power supply, and a cathode of the capacitor C2 is connected with a source electrode of the mos transistor Q2 and a cathode of the power supply.

Further, the resonant circuit comprises an inductor Lr and a capacitor Cr, wherein the anode of the capacitor Cr is connected with one end of the inductor Lr, and the other end of the inductor Lr is connected with the source electrode of the mos transistor Q1.

Further, the rectifying circuit I comprises a diode D₁₊And a capacitor C₁₊Said diode D₁₊Is connected with the cathode of a capacitor Cr, a diode D₁₊Output terminal and capacitor C₁₊The anode of the LED lamp bead is connected with the anode input end of the LED lamp bead in series connection, and the capacitor C₁₊The negative pole of the LED lamp bead is connected with the negative pole input end of the LED lamp bead connected in series and the positive pole of the capacitor C2.

Further, the rectification circuit II comprises a diode D_1-And a capacitor C_1-Said diode D_1-Is connected with the cathode of the capacitor Cr, and a diode D₁₊Input terminal and capacitor C₁₊The negative electrode of the LED lamp bead is connected with the negative electrode input end of the LED lamp bead in series connection, and the capacitor C₁₊The anode of the LED lamp bead is connected with the anode input end of the LED lamp bead connected in series and the anode of the capacitor C2.

Furthermore, the number of the LED array circuits is 6, and 10-30 LED lamp beads are connected in series on each of the rectifying circuit I and the rectifying circuit II.

The utility model adopts the above technical scheme, the utility model discloses following technological effect has:

the utility model discloses reduced devices such as the converter of traditional circuit, great simplification the structure of circuit for the cost is lower, adopts frequency conversion constant current source frequency to be less than half of resonant frequency when utilizing SRC as an operating switch, ensures reliably can be in the power of open loop configuration under operation with adjustable constant current power supply.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, preferred embodiments are described in detail. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

As shown in FIG. 1, the utility model relates to a multichannel led drive circuit, including switching circuit, a plurality of led array circuit is parallelly connected to be connected with switching circuit, and led array circuit includes resonant circuit, rectifier circuit I and rectifier circuit II all are connected with resonant circuit, rectifier circuit I and rectifier circuit II all are connected with the led lamp pearl of establishing ties. The switch circuit plays a role in switch control, the equivalent impedance of the resonance circuit is small, and the impedance is pure resistance. The magnitude of the series resistance does not affect the natural frequency of the series resonant circuit, but has the effect of controlling and adjusting the current and voltage amplitudes at resonance. As shown in fig. 1, the led array circuits are all connected to the switch circuit, and are driven by the switch circuit in a unified manner.

The switch circuit comprises mos tubes Q1 and Q2, diodes D1 and D2, capacitors C1 and C2, the input end of the diode D1 is connected with the source electrode of the mos tube Q1, the output end of the diode D1 is connected with the drain electrode of the mos tube Q1, the input end of the diode D2 is connected with the source electrode of the mos tube Q2, the output end of the diode D2 is connected with the drain electrode of the mos tube Q2, the source electrode of the mos tube Q1 is connected with the drain electrode of the mos tube Q2, the capacitors C1 and C2 are connected in series, the positive electrode of the capacitor C1 is connected with the drain electrode of the mos tube Q1 and the positive electrode of a power supply, and the negative electrode of the capacitor C2 is connected with the source electrode of the mos tube Q2 and the negative electrode of the power supply. The mos tubes Q1 and Q2 are used as switching tubes for switching control.

The resonant circuit comprises an inductor Lr and a capacitor Cr, wherein the anode of the capacitor Cr is connected with one end of the inductor Lr, and the other end of the inductor Lr is connected with the source electrode of a mos tube Q1.

The rectifying circuit I comprises a diode D₁₊And a capacitor C₁₊Said diode D₁₊Is connected with the cathode of a capacitor Cr, a diode D₁₊Output terminal and capacitor C₁₊The anode of the LED lamp bead is connected with the anode input end of the LED lamp bead in series connection, and the capacitor C₁₊The negative pole of the LED lamp bead is connected with the negative pole input end of the LED lamp bead connected in series and the positive pole of the capacitor C2. The rectification circuit II comprises a diode D_1-And a capacitor C_1-Said diode D_1-Is connected with the cathode of the capacitor Cr, and a diode D₁₊Input terminal and capacitor C₁₊The negative electrode of the LED lamp bead is connected with the negative electrode input end of the LED lamp bead in series connection, and the capacitor C₁₊The anode of the LED lamp bead is connected with the anode input end of the LED lamp bead connected in series and the anode of the capacitor C2.

The number of the LED array circuits is 6, and each of the rectifying circuit I and the rectifying circuit II is connected with 10 LED lamp beads in series. The connection part of the rectifying circuit I and the rectifying circuit II with the LED lamp beads directly uses a wiring section assembly, and when the LED lamp beads are installed, the LED lamp beads are directly and fixedly connected in series.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A multichannel led drive circuit, characterized in that: including switch circuit, a plurality of led array circuit is parallelly connected and is connected with switch circuit, and led array circuit includes resonant circuit, rectifier circuit I and rectifier circuit II all are connected with resonant circuit, rectifier circuit I and rectifier circuit II all are connected with the led lamp pearl of establishing ties.

2. A multi-channel led driver circuit as claimed in claim 1, wherein: the switch circuit comprises mos tubes Q1 and Q2, diodes D1 and D2, capacitors C1 and C2, the input end of the diode D1 is connected with the source electrode of the mos tube Q1, the output end of the diode D1 is connected with the drain electrode of the mos tube Q1, the input end of the diode D2 is connected with the source electrode of the mos tube Q2, the output end of the diode D2 is connected with the drain electrode of the mos tube Q2, the source electrode of the mos tube Q1 is connected with the drain electrode of the mos tube Q2, the capacitors C1 and C2 are connected in series, the positive electrode of the capacitor C1 is connected with the drain electrode of the mos tube Q1 and the positive electrode of a power supply, and the negative electrode of the capacitor C2 is connected with the source electrode of the mos tube Q2 and the negative electrode of the power supply.

3. A multi-channel led driver circuit as claimed in claim 2, wherein: the resonant circuit comprises an inductor Lr and a capacitor Cr, wherein the anode of the capacitor Cr is connected with one end of the inductor Lr, and the other end of the inductor Lr is connected with the source electrode of a mos tube Q1.

4. A multi-channel led driver circuit as claimed in claim 3, wherein: the rectifying circuit I comprises a diode D₁₊And a capacitor C₁₊Said diode D₁₊Is connected with the cathode of a capacitor Cr, a diode D₁₊Output terminal and capacitor C₁₊The anode of the LED lamp bead is connected with the anode input end of the LED lamp bead in series connection, and the capacitor C₁₊The negative pole of the LED lamp bead is connected with the negative pole input end of the LED lamp bead connected in series and the positive pole of the capacitor C2.

5. A multi-channel led driver circuit as claimed in claim 4, wherein: the rectification circuit II comprises twoPolar tube D_1-And a capacitor C_1-Said diode D_1-Is connected with the cathode of the capacitor Cr, and a diode D₁₊Input terminal and capacitor C₁₊The negative electrode of the LED lamp bead is connected with the negative electrode input end of the LED lamp bead in series connection, and the capacitor C₁₊The anode of the LED lamp bead is connected with the anode input end of the LED lamp bead connected in series and the anode of the capacitor C2.

6. A multi-channel led driver circuit as claimed in claim 1, wherein: the number of the LED array circuits is 6, and 10-30 LED lamp beads are connected in series on each rectifying circuit I and each rectifying circuit II.