CN220402008U

CN220402008U - LED driving circuit

Info

Publication number: CN220402008U
Application number: CN202320509469.2U
Authority: CN
Inventors: 陈海生
Original assignee: Ningbo Haishu Yongruiyuan Electronics Co ltd
Current assignee: Ningbo Haishu Yongruiyuan Electronics Co ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2024-01-26
Anticipated expiration: 2033-03-16

Abstract

The application discloses LED drive circuit includes: a power supply; the boosting module is connected with the power supply and outputs working voltage for supplying power to the LEDs; the working voltage supplies power to the oscillator, and the oscillator works to output square wave signals; the square wave signal is output to the second inductor through the MOS tube, and the second inductor generates alternating current; and the rectification filter module filters the alternating current to output working current through the rectification filter module, and the working current supplies power to the LED. The voltage and the current of the power supply are improved, and the power supply has good driving capability.

Description

LED driving circuit

Technical Field

The application relates to the field of power supply circuits, in particular to an LED driving circuit.

Background

The existing LED driving circuit can adopt a power supply matched with the LEDs to drive, namely, a low-voltage power supply is used for driving the low-power LEDs to work, and a high-voltage power supply is used for driving the high-power LEDs to work. Related prior art such as "a single live wire power supply circuit" in chinese patent application, application (patent) No.: CN201510777810.2; the power supply for the control system under the single live wire operation is disclosed, and the power supply technology and the standby current reflect the performances of stability, reliability and the like. The single-live wire power supply circuit comprises a circuit A1, a circuit A2 and a circuit A3; the circuit A1 comprises a piezoresistor TVR1 and a polypropylene capacitor CBB capacitor CF1, and the piezoresistor TVR1 and the polypropylene capacitor CBB capacitor CF1 are connected in parallel; the circuit A2 comprises a switching power supply driving chip U1 and a capacitor C15; the circuit A3 comprises a transformer TR1, a rectifying output circuit, a quick power taking branch circuit and a power load. Through the scheme, the power supply requirement of an intelligent control system of an LED product with more than 3W, a fluorescent lamp with any power and an incandescent lamp in the current market can be met, and the phenomena of explosion flash, micro-brightness, misoperation and the like under the condition that a polypropylene capacitor CBB capacitor is not connected in parallel on a load terminal fire zero line can be overcome.

Related prior art is also "LED street lamp constant current driving circuit", application (patent) No.: CN200920254832.0 discloses that the power input end is connected in series with a current limiting resistor Rs and then connected with an LED light source, the negative electrode of the LED light source is connected in series with an inductor L1 and then connected with the Lx end of a constant current control chip IC 1; leads at two ends of the current limiting resistor Rs are connected to a Vn end and an Lm end of the constant current control chip IC1 in a tapping way; a voltage stabilizing diode D1 is connected in series between an Lx end and a Vn end of the constant current control chip IC1, and a sampling resistor Rh is connected in series between an RTM end of the constant current control chip IC1 and a ground wire; the RNTC end of the constant current control chip IC1 is connected with a capacitor C2 in series and then grounded; one path of GND end of the constant current control chip IC1 is connected with a ground wire, and the other path is connected with a capacitor C1 in series and then is connected with a power input end A; a thermistor Rt is connected in parallel with the capacitor C2; a conducting chip Dt is connected in parallel with each light emitting diode in the LED light source. The utility model can be used for driving a 3W LED light source.

In the prior art scheme disclosed above, the 220V commercial power is used for driving the LED products with more than 3 to work, or the 10-60V direct current working voltage is used for driving the output current of the driving circuit to 700mA, and the driving circuit is used for driving the LED light source with 3W to work. The power supply of the driving circuit has higher requirements, and the driving capability of the driving circuit is limited by adopting a low power supply; the 3W LED works to be connected with a market point or is matched with a plurality of dry batteries, and the use cost is high.

Disclosure of Invention

The technical problem to be solved by the application is to provide an LED driving circuit which is used for improving the voltage and the current of a power supply and has good driving capability.

The technical scheme that this application adopted is: an LED driving circuit comprising:

a power supply source is used for supplying power,

the boosting module is connected with the power supply and outputs working voltage for supplying power to the LEDs;

the working voltage supplies power to the oscillator, and the oscillator works to output square wave signals;

the square wave signal is output to the second inductor through the MOS tube, and the second inductor generates alternating current;

and the rectification filter module filters the alternating current to output working current through the rectification filter module, and the working current supplies power to the LED.

Compared with the prior art, the power supply boosting device has the advantages that the boosting module is adopted to boost the power supply, but simple boosting cannot be used for driving the LEDs with larger power. Therefore, after the voltage is increased by adopting the voltage boosting module, the current of the circuit is further increased by adopting the oscillator, the MOS tube and the second inductor. Specifically, an oscillator is adopted to generate square wave signals, the square wave signals are matched with an MOS tube to enable two ends of a second inductor to generate alternating currents, and then the alternating currents are filtered through a rectifying and filtering module to obtain working currents required by a high-power LED. The power supply is boosted and flows up, the power supply can be used for driving the LED with larger power, and the driving capability of the circuit is improved. And the dry battery is used for supplying power, so that the use cost of the LED is reduced.

In some embodiments of the present application, the power supply is a 1.2V battery. The two ends of the battery are connected with a first capacitor in parallel.

The battery is connected with the boost module, and the boost module outputs the working voltage of 3.3V.

Specifically, boost module include that the model is ME 2188's boost chip and first inductance, power supply's positive pole end is connected with boost chip's second pin through first inductance, power supply's negative pole end is connected with boost chip's first pin, boost chip's third pin output operating voltage. The third pin of the boost chip is grounded after passing through the third capacitor.

After the voltage of 1.2V is increased to 3.3V, a common circuit can only drive LEDs with power of 0.3W below 0.1A, and the current is further increased, so that the whole circuit can drive LEDs with power above 1W.

In some embodiments of the present application, the oscillator employs a chip with a model LTC1799, an operating voltage output by the boost chip is connected to a first pin of the oscillator, the operating voltage output by the boost chip is connected to a third pin of the oscillator through a second resistor, and a fifth pin of the oscillator outputs a square wave signal. The second pin of the oscillator is grounded.

The working voltage of 3.3V supplies power to the oscillator at the same time, the oscillator works to generate a square wave signal with a certain frequency, and the square wave signal drives the MOS tube to be alternately conducted and closed to cooperatively realize that two ends of the second inductor generate alternating current.

In some embodiments of the present application, the source of the MOS transistor is grounded, the drain of the MOS transistor is connected to one end of the second inductor, the other end of the second inductor is connected to the positive electrode of the battery, and the gate of the MOS transistor is connected to the oscillator. Specifically, the grid electrode of the MOS tube is connected with the fifth pin of the oscillator, and the grid electrode of the MOS tube is connected with the source electrode of the MOS tube through the first resistor.

In some embodiments of the present application, the rectifying and filtering module includes a second diode and a second capacitor, one end of the second inductor is connected to the positive electrode of the second diode, the second capacitor is connected to two ends of the LED in parallel, the negative electrode of the second diode is connected to the positive electrode of the LED, and the negative electrode of the LED is grounded.

The rectification filter module filters the alternating current generated by the second inductor to generate large current voltage required by the high-power LED, and the current of the voltage can reach more than 0.7A, so that the LED with the power of 1-3W can be completely driven, and the driving power is increased by 3-10 times.

The above embodiments may be arbitrarily combined on the basis of common knowledge in the art.

Drawings

The present application will be described in further detail below in conjunction with the drawings and preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the present application. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.

FIG. 1 is a schematic structural diagram of the present application;

fig. 2 is a schematic diagram of an LED driving circuit of the present application.

Wherein, the reference numerals specifically explain as follows: r1, a first resistor; r2, a second resistor; l1, a first inductor; l2, a second inductor; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; d2, a second diode; q2, MOS tube; u1, a boosting chip; u2, oscillator.

Detailed Description

The present application will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

An LED driving circuit is shown in fig. 1 and 2: comprising the following steps: a power supply; the boosting module is connected with the power supply and outputs working voltage for supplying power to the LEDs; the oscillator U2 supplies power to the working voltage, and the oscillator U2 works to output square wave signals; the square wave signal is output to the second inductor L2 through the MOS tube Q2, and the second inductor L2 generates alternating current; and the rectification filter module filters the alternating current to output working current through the rectification filter module, and the working current supplies power to the LED.

Boosting the power supply with a boost module is common practice, but simple boosting cannot be used to drive LEDs with higher power. Therefore, after the voltage is increased by adopting the voltage increasing module, the current of the circuit is further increased by adopting the oscillator U2, the MOS tube Q2 and the second inductor L2. Specifically, an oscillator U2 is adopted to generate a square wave signal, the square wave signal is matched with an MOS tube Q2 to enable two ends of a second inductor L2 to generate alternating current, and then the alternating current is filtered through a rectifying and filtering module to obtain working current required by a high-power LED. The power supply is boosted and flows up, the power supply can be used for driving the LED with larger power, and the driving capability of the circuit is improved. And the dry battery is used for supplying power, so that the use cost of the LED is reduced.

The power supply is a 1.2V battery. The two ends of the battery are connected in parallel with a first capacitor C1. The battery is connected with the boost module, and the boost module outputs the working voltage of 3.3V. Specifically, boost module include that model ME 2188's boost chip U1 and first inductance L1, power supply's positive pole end is connected with boost chip U1's second pin through first inductance L1, power supply's negative pole end is connected with boost chip U1's first pin, boost chip U1's third pin output operating voltage. The third pin of the boost chip U1 is grounded after passing through the third capacitor C3.

The oscillator U2 adopts a chip with the model LTC1799, the working voltage output by the boosting chip U1 is connected to a first pin of the oscillator U2, the working voltage output by the boosting chip U1 is connected to a third pin of the oscillator U2 through a second resistor R2, and a fifth pin of the oscillator U2 outputs square wave signals. A second pin of the oscillator U2 is grounded. The working voltage of 3.3V supplies power to the oscillator U2 at the same time, the oscillator U2 works to generate a square wave signal with a certain frequency, and the square wave signal drives the MOS tube Q2 to be alternately conducted and closed to cooperatively realize that two ends of the second inductor L2 generate alternating current.

The source electrode of the MOS tube Q2 is grounded, the drain electrode of the MOS tube Q2 is connected with one end of the second inductor L2, the other end of the second inductor L2 is connected with the positive electrode of the battery, and the grid electrode of the MOS tube Q2 is connected with the oscillator U2. Specifically, the gate of the MOS transistor Q2 is connected to the fifth pin of the oscillator U2, and the gate of the MOS transistor Q2 is connected to the source of the MOS transistor Q2 through the first resistor R1.

The rectification filter module comprises a second diode D2 and a second capacitor C2, one end of the second inductor L2 is connected with the positive electrode of the second diode D2, the second capacitor C2 is connected with the two ends of the LED in parallel, the negative electrode of the second diode D2 is connected with the positive electrode of the LED, and the negative electrode of the LED is grounded. The rectification filter module filters the alternating current generated by the second inductor L2 to generate large current voltage required by the high-power LED, the current of the voltage can reach more than 0.7A, and the LED with the power of 1-3W can be completely driven, so that the driving power is increased by 3-10 times.

The foregoing has outlined rather broadly the principles and embodiments of the present application in order that the detailed description of the utility model may be better understood, and in order that the present application may be better understood. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.

Claims

1. An LED driving circuit characterized by comprising:

a power supply;

2. An LED driving circuit according to claim 1, characterized by a battery with a power supply of 1.2V; the two ends of the battery are connected with a first capacitor in parallel.

3. The LED driving circuit of claim 1, wherein the boost module comprises a boost chip of type ME2188 and a first inductor.

4. The LED driving circuit according to claim 3, wherein the positive terminal of the power supply is connected to the second pin of the boost chip through the first inductor, the negative terminal of the power supply is connected to the first pin of the boost chip, the third pin of the boost chip outputs the operating voltage, and the third pin of the boost chip is grounded after passing through the third capacitor.

5. An LED driving circuit according to claim 1, wherein said oscillator is a chip of type LTC 1799.

6. The LED driving circuit of claim 5, wherein the operating voltage output from the boost chip is connected to a first pin of the oscillator, the operating voltage output from the boost chip is connected to a third pin of the oscillator through a second resistor, a fifth pin of the oscillator outputs a square wave signal, and the second pin of the oscillator is grounded.

7. The LED driving circuit according to claim 1, wherein a source electrode of the MOS tube is grounded, a drain electrode of the MOS tube is connected with one end of the second inductor, the other end of the second inductor is connected with an anode of the battery, and a grid electrode of the MOS tube is connected with the oscillator.

8. The LED driving circuit according to claim 1 or 7, wherein a gate of the MOS transistor is connected to a fifth pin of the oscillator, and the gate of the MOS transistor is connected to a source of the MOS transistor through the first resistor.

9. The LED driving circuit of claim 1, wherein the rectifying and filtering module comprises a second diode and a second capacitor, wherein one end of the second inductor is connected with the positive electrode of the second diode, the second capacitor is connected in parallel with two ends of the LED, the negative electrode of the second diode is connected with the positive electrode of the LED, and the negative electrode of the LED is grounded.