CN218772496U

CN218772496U - LED drive circuit

Info

Publication number: CN218772496U
Application number: CN202222602055.2U
Authority: CN
Inventors: 刁显江
Original assignee: Opple Road Lighting Co ltd
Current assignee: Opple Road Lighting Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-03-28
Anticipated expiration: 2032-09-29

Abstract

An LED drive circuit comprises a constant voltage drive module, a current regulation signal generation module and a constant current module; the constant voltage driving module is connected with the external alternating current, receives the input of the external alternating current and converts the input of the external alternating current into a first direct current for output; the current adjusting signal generating module is connected with the constant voltage driving module and the constant current module, receives current adjusting setting information from the outside and outputs a current adjusting signal to the constant current module according to the current adjusting setting information; the constant current module is connected with the constant voltage driving module and the current adjusting signal generating module, and converts the first direct current into a second direct current with voltage lower than that of the first direct current according to the current adjusting signal output by the current adjusting signal generating module to supply the second direct current to the LED load. This application can export different electric currents according to the current regulation signal and give different LED loads, can satisfy the demand of different lamps and lanterns in a flexible way.

Description

LED drive circuit

Technical Field

The application relates to the technical field of circuit design, in particular to an LED driving circuit.

Background

With the development of society, LED lamps are widely used by people due to their characteristics of high brightness, low power consumption, long life, and the like. However, different LED lamps have different voltage, current, and luminous flux specifications, and the LED lamps have different specifications and different circuit connections in different projects, so the voltage and current required by the LED driving circuit are often not the same. The output voltage of the constant-current LED driving circuit has a certain adaptation range, but the output current is fixed, so that the requirements of different lamps cannot be flexibly met. Therefore, in order to meet the requirements of different LED lamps, various driving circuits need to be arranged, the material types are many, the production cost is high, the production flow is very complex and tedious, no method is used for large-scale production, and the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

The application aims to provide an LED drive circuit suitable for various LED lamps.

To achieve the above object, the present application provides an LED driving circuit, comprising: the constant-voltage driving module, the current adjusting signal generating module and the constant-current module are connected with the constant-current module;

the constant voltage driving module is connected with the external alternating current, receives the input of the external alternating current and converts the input of the external alternating current into a first direct current output;

the current adjusting signal generating module is connected with the constant voltage driving module and the constant current module, receives current adjusting setting information from the outside and outputs a current adjusting signal to the constant current module according to the current adjusting setting information;

the constant current module is connected with the constant voltage driving module and the current adjusting signal generating module, and converts the first direct current into a second direct current with voltage lower than that of the first direct current according to the current adjusting signal output by the current adjusting signal generating module to supply the second direct current to the LED load.

Further, the constant voltage driving module includes an input rectifying unit, a constant voltage unit, and a first voltage dropping unit, and the input rectifying unit includes: the rectifier bridge, the second capacitor, the first input end and the second input end; the first input end is connected with the second end of the rectifier bridge, the second input end is connected with the third end of the rectifier bridge, the fourth end of the rectifier bridge is grounded, the first end of the rectifier bridge is connected with the first end of the second capacitor and the constant voltage unit, and the second end of the second capacitor is grounded.

Further, the constant voltage unit comprises a first control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, an eighth resistor, a first capacitor, a sixth capacitor, a seventh capacitor, a first MOS transistor, a second diode, a third diode and a third electrolytic capacitor; a first pin of the first control chip is connected with a gate of the first MOS transistor, a drain of the first MOS transistor is connected with a first end of the second diode and the first voltage-dropping unit, a second end of the second diode is connected with a first end of the first capacitor and a first end of the first resistor, a second end of the first capacitor is connected with a second end of the second resistor and the first voltage-dropping unit, a source of the first MOS transistor is connected with a first end of the eighth resistor and a second end of the fifth resistor, and a second end of the eighth resistor is grounded; a second pin of the first control chip is grounded; a third pin of the first control chip is connected with a first end of the seventh capacitor and a first end of the fifth resistor, a second end of the seventh capacitor is grounded, and a second end of the fifth resistor is connected with a first end of the eighth resistor; a fourth pin of the first control chip is connected with a first end of the second resistor and a first end of the sixth capacitor, a second end of the second resistor is connected with the input rectifying unit, and a second end of the sixth capacitor is grounded; the fifth pin of the first control chip is connected with the first end of the fourth resistor and the first end of the seventh resistor, the second end of the seventh resistor is grounded, the second end of the fourth resistor is connected with the first end of the third diode and the first voltage reduction unit, the second end of the third diode is connected with the first end of the third electrolytic capacitor, the first end of the third resistor and the sixth pin of the first control chip, the second end of the third electrolytic capacitor is grounded, and the second end of the third resistor is connected with the second end of the second resistor, the second end of the first capacitor and the first voltage reduction unit.

Further, the first voltage reduction unit comprises a first transformer, a first electrolytic capacitor and a first diode; a first pin, a fourth pin and a sixth pin of the first transformer are connected with the constant voltage unit, and a fifth pin of the first transformer is grounded; a ninth pin of the first transformer is connected with a first end of the first diode, and a second end of the first diode is connected with a first end of the first electrolytic capacitor and the constant current module; the second end of the first electrolytic capacitor is grounded.

Further, the current regulation signal generation module comprises a fourth control chip, a fourth capacitor, a fifth capacitor, an eighth capacitor, a ninth resistor and a near field communication antenna; a first pin of the fourth control chip is connected with a first end of the ninth resistor, a second end of the ninth resistor is connected with the second constant current module, and a second pin of the fourth control chip is connected with a first end of the fourth capacitor, a first end of the fifth capacitor and a first end of the near field communication antenna; a third pin of the fourth control chip is connected with a second end of the fourth capacitor, a second end of the fifth capacitor and a second end of the near field communication antenna; a fourth pin of the fourth control chip is grounded; a fifth pin of the fourth control chip is connected with the constant current module; a sixth pin of the fourth control chip is connected with the constant current module; and an eighth pin of the fourth control chip is connected with a first end of the eighth capacitor, and a second end of the eighth capacitor is grounded.

Further, the constant current module comprises a third control chip, a ninth capacitor, a tenth resistor, a fifth diode, a third inductor and a fourth electrolytic capacitor; a first pin of the third control chip is connected with the current regulation signal generation module, a second pin of the third control chip is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with a fourth pin of the third control chip and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin of the third control chip is connected to the first end of the fifth diode and the first end of the third inductor, the second end of the fifth diode is connected to the first end of the fourth electrolytic capacitor, and the second end of the fourth electrolytic capacitor is connected to the second end of the third inductor.

Further, the constant current module comprises a first constant current module and a second constant current module, the first constant current module is connected with the warm color LED load, and the second constant current module is connected with the cold color LED load.

Further, the first constant current module includes: the second control chip, a sixth resistor, a third capacitor, a fourth diode, a second inductor and a second electrolytic capacitor; the first pin of the second control chip is connected with the current regulation signal generation module, the second pin of the second control chip is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with the fourth pin of the second control chip and grounded; a fifth pin of the second control chip is connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded; a seventh pin of the second control chip is connected to a first end of the fourth diode and a first end of the second inductor, a second end of the fourth diode is connected to a first end of the second electrolytic capacitor, and a second end of the second electrolytic capacitor is connected to a second end of the second inductor;

the second constant current module comprises: the third control chip, the ninth capacitor, the tenth resistor, the fifth diode, the third inductor and the fourth electrolytic capacitor; a first pin of the third control chip is connected with the current regulation signal generation module, a second pin of the third control chip is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with a fourth pin of the third control chip and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin of the third control chip is connected to the first end of the fifth diode and the first end of the third inductor, the second end of the fifth diode is connected to the first end of the fourth electrolytic capacitor, and the second end of the fourth electrolytic capacitor is connected to the second end of the third inductor.

Further, the constant current module may further include a first constant current module, a second constant current module, and a third constant current module, the first constant current module is connected to the red LED load, the second constant current module is connected to the green LED load, and the third constant current module is connected to the blue LED load.

Further, the first constant current module includes: the second control chip, a sixth resistor, a third capacitor, a fourth diode, a second inductor and a second electrolytic capacitor; a first pin of the second control chip is connected with the current regulation signal generation module, a second pin of the second control chip is connected with a first end of the third capacitor, and a second end of the third capacitor is connected with a fourth pin of the second control chip and grounded; a fifth pin of the second control chip is connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded; a seventh pin of the second control chip is connected to a first end of the fourth diode and a first end of the second inductor, a second end of the fourth diode is connected to a first end of the second electrolytic capacitor, and a second end of the second electrolytic capacitor is connected to a second end of the second inductor;

the second constant current module includes: the third control chip, a ninth capacitor, a tenth resistor, a fifth diode, a third inductor and a fourth electrolytic capacitor; the first pin of the third control chip is connected with the current regulation signal generation module, the second pin of the third control chip is connected with the first end of the ninth capacitor, and the second end of the ninth capacitor is connected with the fourth pin of the third control chip and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin of the third control chip is connected to the first end of the fifth diode and the first end of the third inductor, the second end of the fifth diode is connected to the first end of the fourth electrolytic capacitor, and the second end of the fourth electrolytic capacitor is connected to the second end of the third inductor.

The third constant current module includes: the third control chip, the tenth capacitor, the eleventh resistor, the sixth diode, the fourth inductor and the fifth electrolytic capacitor are connected in series; a first pin of the fifth control chip is connected with the current regulation signal generation module, a second pin of the fifth control chip is connected with a first end of the tenth capacitor, and a second end of the tenth capacitor is connected with a fourth pin of the fifth control chip and grounded; a fifth pin of the fifth control chip is connected with a first end of the eleventh resistor, and a second end of the eleventh resistor is grounded; a seventh pin of the fifth control chip is connected to the first end of the sixth diode and the first end of the fourth inductor, the second end of the sixth diode is connected to the first end of the fifth electrolytic capacitor, and the second end of the fifth electrolytic capacitor is connected to the second end of the fourth inductor.

Has the beneficial effects that: the application provides an LED driving circuit, which comprises a constant voltage driving module, a current regulating signal generating module and a constant current module; the constant voltage driving module is connected with the external alternating current, receives the input of the external alternating current and converts the input of the external alternating current into a first direct current output; the current adjusting signal generating module is connected with the constant voltage driving module and the constant current module, receives current adjusting setting information from the outside and outputs a current adjusting signal to the constant current module according to the current adjusting setting information; the constant current module is connected with the constant voltage driving module and the current adjusting signal generating module, and converts the first direct current into a second direct current with voltage lower than that of the first direct current according to the current adjusting signal output by the current adjusting signal generating module to supply the second direct current to the LED load. This application can export different electric currents for different LED loads according to current regulation signal, need not be equipped with multiple drive circuit just can satisfy the demand of different lamps and lanterns in a flexible way, therefore required material kind is few, has reduced the cost of production, has simplified production flow, is favorable to carrying out the scale production, has improved production efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a block diagram of an LED driving circuit provided in the present application;

fig. 2 is a circuit diagram of an LED driving circuit provided in an embodiment of the present application;

fig. 3 is a circuit diagram of an LED driving circuit provided in an embodiment of the present application;

FIG. 4 is a circuit diagram of an LED driver circuit provided in one embodiment of the present application;

fig. 5 is a circuit diagram of an LED driving circuit according to an embodiment of the present application.

Detailed Description

In order to make the purpose, technical scheme and effect of the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the embodiments and claims, the articles "a", "an", "the" and "the" may include plural forms as well, unless the context specifically dictates otherwise. If in the embodiments of the present application there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

The present application provides an LED driving circuit, which is described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described in detail in a certain embodiment.

At present, because the LED lamps have different voltage, current and luminous flux specifications, in practical application, the LED specifications are different and the series-parallel relationship is also different in different projects, so the required voltage and current of the LED driving circuit are often inconsistent. Although the output voltage of the constant-current LED driving circuit has a certain adaptation range, the output current is fixed, and different lamp requirements cannot be flexibly met. Meanwhile, different LEDs have different color temperatures or colors, in order to meet the requirements of different scene applications, the actual color temperatures or colors of the lamps are different, various driving power supplies are required to be equipped, the material types are many, the production cost is high, the production flow is very complex and tedious, large-scale production cannot be performed, and the production efficiency is low. If in order to meet the requirements of different lamps, a plurality of driving circuits are required to be prepared, so that the types of materials are more, the material cost cannot be reduced through large-batch collection, the production complexity is also caused, and the large-scale production cannot be carried out. Therefore, the utility model provides a different LED lamps and lanterns demand is satisfied in design that a commonality LED drive circuit is provided in this application, only need set up a LED drive circuit just can satisfy multiple LED's demand, and in practical application, driven article type quantity reduces, and the purchase volume of general material increases, and the purchase cost of material has just reduced, can effectively promote production efficiency and practice thrift the cost.

As shown in fig. 1, the present application provides an LED driving circuit including: the constant-voltage driving circuit comprises a constant-voltage driving module 100, a current regulating signal generating module 200 and a constant-current module 300; the constant voltage driving module 100 is connected with external alternating current, receives input of the external alternating current, and converts the input of the external alternating current into first direct current output; the current adjusting signal generating module 200 is connected to both the constant voltage driving module 100 and the constant current module 300, and the current adjusting signal generating module 200 receives current adjusting setting information from the outside and outputs a current adjusting signal to the constant current module 300 according to the current adjusting setting information; the constant current module 300 is connected to the constant voltage driving module 100 and the current adjusting signal generating module 200, and converts the first direct current into a second direct current with a voltage lower than the first direct current according to the current adjusting signal output by the current adjusting signal generating module 200, and supplies the second direct current to the LED load.

Referring to fig. 2, in an LED driving circuit provided in an embodiment of the present application, the constant voltage driving module includes an input rectifying unit 110, a constant voltage unit 120, and a first voltage dropping unit 130, where the input rectifying unit 110 includes: the rectifier bridge DB1, the second capacitor C2, the first input end L1 and the second input end N1; first input end L1 connects rectifier bridge DB 1's second end, second input end N1 connects rectifier bridge DB 1's third end, rectifier bridge DB 1's fourth end ground connection, rectifier bridge DB 1's first end is connected second electric capacity C2's first end and constant voltage unit 120, second electric capacity C2's second end ground connection. The input rectifying unit 100 converts the external alternating current input from the first input terminal L1 and the second input terminal N1 into a first direct current through the rectifying bridge DB1 and the first electrolytic capacitor EC 1. The rectifier bridge DB1 is used for converting alternating current into direct current, the second capacitor C2 is connected with the output end of the rectifier bridge DB1 in parallel, and the second capacitor C2 plays a role in preventing voltage mutation and absorbing overvoltage in a peak state.

Further, the constant voltage unit 120 includes a first control chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a sixth capacitor C6, a seventh capacitor C7, a first MOS transistor Q1, a second diode D2, a third diode D3, and a third electrolytic capacitor EC3; a first pin Out of the first control chip U1 is connected to a gate of the first MOS transistor Q1, a drain of the first MOS transistor Q1 is connected to a first end of the second diode D2 and the first voltage-dropping unit, a second end of the second diode D2 is connected to a first end of the first capacitor C1 and a first end of the first resistor R1, a second end of the first capacitor C1 is connected to a second end of the second resistor R2 and the first voltage-dropping unit, a source of the first MOS transistor Q1 is connected to a first end of the eighth resistor R8 and a second end of the fifth resistor R5, and a second end of the eighth resistor R8 is grounded; a second pin GND of the first control chip U1 is grounded; a third pin CS of the first control chip U1 is connected to a first end of the seventh capacitor C7 and a first end of the fifth resistor R5, a second end of the seventh capacitor C7 is grounded, and a second end of the fifth resistor R5 is connected to a first end of the eighth resistor R8; a fourth pin Vin of the first control chip U1 is connected to a first end of the second resistor R2 and a first end of the sixth capacitor C6, a second end of the second resistor R2 is connected to the input rectifying unit 110, and a second end of the sixth capacitor C6 is grounded; the fifth pin FB of the first control chip U1 is connected to the first end of the fourth resistor R4 and the first end of the seventh resistor R7, the second end of the seventh resistor R7 is grounded, the second end of the fourth resistor R4 is connected to the first end of the third diode D3 and the first voltage-dropping unit 130, the second end of the third diode D3 is connected to the first end of the third electrolytic capacitor EC3, the first end of the third resistor R3 and the sixth pin Vcc of the first control chip U1, the second end of the third electrolytic capacitor EC3 is grounded, and the second end of the third resistor R3 is connected to the second end of the second resistor R2, the second end of the first resistor R1, the second end of the first capacitor C1 and the first voltage-dropping unit 130. In one embodiment, the first control chip U1 is an IW3627 chip manufactured by dialog semiconductor corporation, and the IW3627 chip is a single-stage AC/DC constant voltage controller with high power factor correction function, supporting isolated and non-isolated topologies including flyback, buck-boost, and buck, and can achieve extremely low load and line voltage regulation rates. However, it should be noted that the above chip is not used to limit the present application, and any equivalent replacement of the present application by a control chip with the same function is included in the protection scope of the present application by way of example only. The constant voltage unit 120 plays a role of generating a constant voltage by providing the first control chip U1.

The first voltage reduction unit 130 includes a first transformer T1, a first electrolytic capacitor EC1, and a first diode D1; a first pin, a fourth pin and a sixth pin of the first transformer T1 are connected to the constant voltage unit 120, and a fifth pin of the first transformer T1 is grounded; a ninth pin of the first transformer T1 is connected to a first end of the first diode D1, and a second end of the first diode D1 is connected to a first end of the first electrolytic capacitor EC1 and the constant current module 300; the second end of the first electrolytic capacitor EC1 is connected to the tenth pin of the first transformer T1 and grounded. The first voltage reduction unit 130 functions to reduce the voltage, and in one embodiment, a direct current voltage of 50V is generated across the first electrolytic capacitor EC 1. It is to be noted that in practice the voltage across the first electrolytic capacitor EC1 may be designed according to specific requirements.

Further, the current adjusting signal generating module 200 includes a fourth control chip U4, a fourth capacitor C4, a fifth capacitor C5, an eighth capacitor C8, a ninth resistor C9, and a near field communication antenna; a first pin Vo of the fourth control chip U4 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is connected to the constant current module 300, and a second pin IN1 of the fourth control chip U4 is connected to a first end of the fourth capacitor C4, a first end of the fifth capacitor C5, and a first end of the near field communication antenna; a third pin IN2 of the fourth control chip U4 is connected to the second end of the fourth capacitor C4, the second end of the fifth capacitor C5 and the second end of the near field communication antenna; a fourth pin GND of the fourth control chip U4 is grounded; a fifth pin PWM0 of the fourth control chip U4 is connected with the constant current module 300; a sixth pin PWM2 of the fourth control chip U4 is connected with the constant current module 300; a seventh pin of the fourth control chip U4 is suspended; an eighth pin VCC of the fourth control chip U4 is connected to the first end of the eighth capacitor C8, and the second end of the eighth capacitor C8 is grounded. In an embodiment of the present application, the current adjusting signal is a PWM signal, the fourth control chip U4 is an NFC chip, and the PWM signal can be generated according to a configuration, and the output current of the constant current module 300 can be adjusted by adjusting a duty ratio of the PWM signal. In practical application, an external NFC read-write device may establish near field communication with the fourth control chip U4 in the current adjustment signal generation module 200, that is, the external NFC read-write device may configure parameters such as a working frequency and a duty ratio of a PWM signal output by the fourth control chip U4, and the fourth control chip U4 transmits the configured working frequency and the configured duty ratio of the PWM signal to the constant current module 300. Moreover, in practical applications, the fourth control chip U4 may further store the operating frequency, duty ratio, and the like of the configured PWM signal into an internal storage space of the fourth control chip U4, after subsequent power-on, the fourth control chip U4 may read the configuration in the internal storage space and output the PWM signal to the constant current module 300 according to the configuration, and when the configuration is not subsequently modified, the configured PWM signal in the current storage space of the fourth control chip U4 is always output subsequently.

In an embodiment of the present application, the fourth control chip U4 inside the current adjusting signal generating module 200 is an NFC chip manufactured by shanghai compound denier microelectronics group ltd, model number FM11 NP04. The chip is an NFC double-interface intelligent tag chip which accords with an ISO/IEC14443-A protocol, a high-efficiency MCU is arranged in the chip, at most three paths of dynamic PWM signals can be output, the frequency and the duty ratio of the PWM signals can be flexibly controlled through an NFC interface, and the chip is used for configuring the working current of an LED and adjusting the brightness of the LED. It should be noted that the above chip is not used to limit the present application, but only by way of example, as long as the communication protocol is satisfied: ISO/IEC14443-A, working frequency 13.56MHz, equivalent replacement of the application by the same type of control chip with PWM output function is included in the protection scope of the application. Specifically, after the external NFC read-write device establishes communication with the fourth control chip U4, parameters such as the frequency and the duty ratio of the output PWM of the fourth control chip U4 may be configured. Further, the configured data is stored in the internal EEPROM storage space by the fourth control chip U4, the data is not lost even if the power is down, and the configured PWM signal is output by the fourth control chip U4 when the PWM signal is subsequently powered on before the PWM signal is reconfigured again by the external NFC read-write device. Therefore, the LED drive circuit can be configured through external NFC read-write equipment in the production stage of a factory and can be supplied to the market according to the obtained predicted output current, so that the output current, the color temperature, the color and the like of the LED drive can be flexibly modified, the types of the LED drive which needs to be purchased are reduced, and the purpose of saving the production cost is achieved.

Further, the constant current module 300 includes a third control chip U3, a ninth capacitor C9, a tenth resistor C10, a fifth diode D5, a third inductor L3, and a fourth electrolytic capacitor EC4; a first pin DIM of the third control chip is connected to a sixth pin PWM2 of the fourth control chip U4 of the current regulation signal generation module 200, a second pin VDD of the third control chip U3 is connected to a first end of the ninth capacitor C9, and a second end of the ninth capacitor C9 is connected to a fourth pin GND of the third control chip U3 and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin Drain of the third control chip U3 is connected to the first end of the fifth diode D5 and the first end of the third inductor L3, the second end of the fifth diode D5 is connected to the first end of the fourth electrolytic capacitor EC4 and the first output end LED +, and the second end of the fourth electrolytic capacitor EC4 is connected to the second end of the third inductor L3 and the third output end LED-. And a third pin NC and a sixth pin NC of the third control chip U3 are suspended. And the first output end LED + and the third output end LED-are connected with an LED load in a connecting mode. The constant current module 300 receives the current adjusting signal output by the current adjusting signal generating module 200, and converts the first direct current into a second direct current with a voltage lower than the first direct current, and supplies the second direct current to the LED load.

In practical applications, the constant current module 300 converts the first direct current into a second direct current for the LED to work, and the constant current module 300 includes a PWM dimming signal port, and can adjust the output current of the constant current module 300 according to the current adjustment signal, that is, the PWM signal. The constant current module 300 has a PWM dimming function, and can adjust an output LED operating current according to an input PWM signal. In this embodiment, the third control chip U3 is a control chip of minmicroelectronics ltd, and is in a model of SM32108E. The chip is a voltage reduction type LED driving chip applied to DC-DC constant output current, and various functional modules such as LED constant current control, PWM dimming, over-temperature protection and the like are integrated in the chip. However, it should be noted that the above chip is not used to limit the present application, and any equivalent replacement of the present application by a control chip with the same function is included in the protection scope of the present application by way of example only. That is, the chip is not limited to the present application as long as the chip has the PWM dimming port, and the output current can be adjusted according to the PWM, and any equivalent replacement of the control chip, the topology, and the like with the same function is included in the protection scope of the present application. In this embodiment, the current adjusting signal is a square wave signal of thousands of HZ, and the first pin DIM of the third control chip U3 enters the third control chip U3 determines the magnitude of the output current according to the PWM signal, so as to control the magnitude of the current value of the output current, and adjust the magnitude of the second direct current by receiving the adjusting signal, and different lamp requirements can be flexibly met without providing multiple types of driving circuits, so that the types of required materials are few, the production cost is reduced, the production flow is simplified, the large-scale production is facilitated, and the production efficiency is improved.

Further, referring to fig. 3, in a specific embodiment, the color temperature of the LED load may be adjusted, and the constant current module 300 includes a first constant current module 310 and a second constant current module 320. Specifically, the first constant current module 310 is connected to a warm LED load, and the second constant current module 320 is connected to a cold LED load. The first constant current module 310 includes: the control circuit comprises a second control chip U2, a sixth resistor R6, a third capacitor C3, a fourth diode D4, a second inductor L2 and a second electrolytic capacitor EC2; a first pin DIM of the second control chip is connected to a fifth pin PWM0 of the fourth control chip U4 of the current regulation signal generation module 200, a second pin VDD of the second control chip is connected to a first end of the third capacitor C3, and a second end of the third capacitor C3 is connected to a fourth pin GND of the second control chip U2 and grounded; a fifth pin CS of the second control chip U2 is connected to a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is grounded; a seventh pin Drain of the second control chip U2 is connected to the first end of the fourth diode D4 and the first end of the second inductor L2, the second end of the fourth diode D4 is connected to the first end of the second electrolytic capacitor EC2 and the first output end LED +, and the second end of the second electrolytic capacitor EC2 is connected to the second end of the second inductor and the second output end LEDW-. And a third pin NC and a sixth pin NC of the second control chip U2 are suspended. And a warm-color LED load is connected between the first output end LED + and the second output end LEDW-.

The second constant current module 320 includes: a third control chip U3, a ninth capacitor C9, a tenth resistor C10, a fifth diode D5, a third inductor L3, and a fourth electrolytic capacitor EC4; a first pin DIM of the third control chip is connected to a sixth pin PWM2 of the fourth control chip U4 of the current regulation signal generation module 200, a second pin VDD of the third control chip U3 is connected to a first end of the ninth capacitor C9, and a second end of the ninth capacitor C9 is connected to a fourth pin GND of the third control chip U3 and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin Drain of the third control chip U3 is connected to the first end of the fifth diode D5 and the first end of the third inductor L3, the second end of the fifth diode D5 is connected to the first end of the fourth electrolytic capacitor EC4 and the first output end LED +, and the second end of the fourth electrolytic capacitor EC4 is connected to the second end of the third inductor L3 and the third output end LEDC-. And a third pin NC and a sixth pin NC of the third control chip U3 are suspended. And a cold color LED load is connected between the first output end LED + and the third output end LEDC-.

Specifically, the first constant current module 310 is connected to a warm LED lamp bead, and the second constant current module 320 is connected to a cold LED lamp bead. The first constant current module 310 and the second constant current module 320 are in a parallel relationship, the first constant current module 310 and the second constant current module 320 are in a common anode relationship, and the LEDs + of the first constant current module 310 and the second constant current module 320 are the positive terminals connected to the CV voltage of the previous stage at the same time. The PWMW of the PWM signals of the first constant current module 310 and the second constant current module 320 is connected to the dimming port DIM pin of the first constant current module 310, the output current of the second control chip U2 of the first constant current module 310 can be adjusted through the PWMW signals, the PWMC is connected to the dimming port DIM pin of the second constant current module 320, and the output current of the third control chip U3 of the second constant current module 320 can be adjusted through the PWMC signals. The different currents of the first constant current module 310 and the second constant current module 320 cause different currents of two paths of LED lamp beads, and the two paths of LED lamp beads have different luminous intensities, and the cold color lamp beads and the warm color lamp beads of the LEDs of the first constant current module 310 and the second constant current module 320 can obtain different color temperatures by mixing.

In practical applications, the first constant current module 310 and the second constant current module 320 convert the first direct current into a second direct current for the LEDs to work, and the first constant current module 310 and the second constant current module 320 include PWM dimming signal ports, which can adjust the output currents of the first constant current module 310 and the second constant current module 320 according to the current adjustment signal, that is, the PWM signal. The first constant current module 310 and the second constant current module 320 have a PWM dimming function, and can adjust output LED operating current according to an input PWM signal. In this embodiment, the second control chip U2 and the third control chip U3 are both control chips of mingming microelectronics ltd, and the model is SM32108E. The chip is a voltage reduction type LED driving chip applied to DC-DC constant output current, and various functional modules such as LED constant current control, PWM dimming, over-temperature protection and the like are integrated in the chip. However, it should be noted that the above-mentioned chips are not used to limit the present application, and any equivalent replacement of the present application by a control chip with the same function is included in the protection scope of the present application by way of example only. That is, the chip is not limited to the present application as long as the chip has the PWM dimming port, and the output current can be adjusted according to the PWM, and any equivalent replacement of the control chip, the topology, and the like with the same function is included in the protection scope of the present application. In this embodiment, the current adjusting signal is a square wave signal of thousands of HZ, and the second control chip U2 and the third control chip U3 enter the second control chip U2 and the third control chip U3 through the first pin DIM of the second control chip U2 and the third control chip U3, and the second control chip U2 and the third control chip U3 determine the magnitude of the output current according to the PWM signal, so as to control the magnitude of the current value of the output current.

Further, as shown in fig. 4, in one embodiment, the first control chip U1 of the constant voltage driving module 100 may use HFC0100HS, a low PF secondary side feedback isolation constant voltage scheme; the second and third control chips U2 and U3 of the first and second constant

current modules

310 and 320 may use H5112A, a BUCK DC-DC constant current dimming scheme, of the semiconductor limited, boon, guan.

Further, fig. 5 is a schematic circuit diagram of an LED driving circuit according to another embodiment of the present application, and the embodiment shown in fig. 5 is explained below. As shown in fig. 5, the present application provides an LED driving circuit, which can realize color adjustment of LED loads, the constant current module 300 may further include a first constant current module 310, a second constant current module 320, and a third constant current module 330, where the first constant current module 310 is connected to a red LED load, the second constant current module 320 is connected to a green LED load, and the third constant current module 330 is connected to a blue LED load.

The first constant current module 310 includes: the control circuit comprises a second control chip U2, a sixth resistor R6, a third capacitor C3, a fourth diode D4, a second inductor L2 and a second electrolytic capacitor EC2; a first pin DIM of the second control chip is connected to a fifth pin PWM0 of the fourth control chip U4 of the current regulation signal generation module 200, a second pin VDD of the second control chip is connected to a first end of the third capacitor C3, and a second end of the third capacitor C3 is connected to a fourth pin GND of the second control chip U2 and grounded; a fifth pin CS of the second control chip U2 is connected to a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is grounded; a seventh pin Drain of the second control chip U2 is connected to the first end of the fourth diode D4 and the first end of the second inductor L2, the second end of the fourth diode D4 is connected to the first end of the second electrolytic capacitor EC2 and the first output end LED +, and the second end of the second electrolytic capacitor EC2 is connected to the second end of the second inductor and the second output end LEDR-. And a third pin NC and a sixth pin NC of the second control chip U2 are suspended. And a red LED load is connected between the first output end LED + and the second output end LEDR-.

The second constant current module 320 includes: a third control chip U3, a ninth capacitor C9, a tenth resistor C10, a fifth diode D5, a third inductor L3, and a fourth electrolytic capacitor EC4; a first pin DIM of the third control chip is connected to a sixth pin PWM2 of the fourth control chip U4 of the current regulation signal generation module 200, a second pin VDD of the third control chip U3 is connected to a first end of the ninth capacitor C9, and a second end of the ninth capacitor C9 is connected to a fourth pin GND of the third control chip U3 and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin Drain of the third control chip U3 is connected to the first end of the fifth diode D5 and the first end of the third inductor L3, the second end of the fifth diode D5 is connected to the first end of the fourth electrolytic capacitor EC4 and the first output end LED +, and the second end of the fourth electrolytic capacitor EC4 is connected to the second end of the third inductor L3 and the third output end LEDG-. And a third pin NC and a sixth pin NC of the third control chip U3 are suspended. And a green LED load is connected between the first output end LED + and the third output end LEDG-.

Further, the third constant current module 330 includes a fifth control chip U5, a tenth capacitor C10, an eleventh resistor R11, a sixth diode D6, a fourth inductor L4, and a fifth electrolytic capacitor EC5; a first pin DIM of the fifth control chip U5 is connected to a seventh pin PWMC of the fourth control chip U4 of the current regulation signal generation module 200, a second pin VDD of the fifth control chip U5 is connected to a first end of the tenth capacitor C10, and a second end of the tenth capacitor C10 is connected to a fourth pin GND of the fifth control chip U5 and grounded; a fifth pin CS of the fifth control chip U5 is connected to a first end of the eleventh resistor R11, and a second end of the eleventh resistor R11 is grounded; a seventh pin Drain of the fifth control chip U5 is connected to the first end of the sixth diode D6 and the first end of the fourth inductor L4, the second end of the sixth diode D6 is connected to the first end of the fifth electrolytic capacitor EC5 and the first output end LED +, and the second end of the fifth electrolytic capacitor EC5 is connected to the second end of the fourth inductor L4 and the fourth output end LEDB-. And a third pin NC and a sixth pin NC of the fifth control chip U5 are suspended. And a blue LED load is connected between the first output end LED + and the fourth output end LEDB-.

Specifically, the first constant current module 310 is connected to a red LED lamp bead, the second constant current module 320 is connected to a green LED lamp bead, and the third constant current module 330 is connected to a green LED lamp bead. The first constant current module 310, the second constant current module 320, and the third constant current module 330 are in a parallel relationship, and the first constant current module 310, the second constant current module 320, and the third constant current module 330 are in a common anode relationship. The different currents of the first constant current module 310, the second constant current module 320 and the third constant current module 330 cause the three paths of LED lamp beads to have different currents and have different luminous intensities, and the three colors of the red lamp bead of the first constant current module 310, the green lamp bead of the second constant current module 320 and the blue lamp bead of the third constant current module 330 are mixed to obtain different colors.

In practical applications, the first constant current module 310, the second constant current module 320, and the third constant current module 330 convert a first direct current into a second direct current for the LEDs to work, and the first constant current module 310, the second constant current module 320, and the third constant current module 330 include PWM dimming signal ports, which can adjust the output currents of the first constant current module 310, the second constant current module 320, and the third constant current module 330 according to the current adjustment signal, that is, the PWM signal. The first constant current module 310, the second constant current module 320, and the third constant current module 330 have a PWM dimming function, and can adjust and output an LED operating current according to an input PWM signal. In this embodiment, the second control chip U2, the third control chip U3, and the fifth control chip U5 are all control chips of mingming microelectronics ltd, and the model is SM32108E. The chip is a voltage reduction type LED driving chip applied to DC-DC constant output current, and various functional modules such as LED constant current control, PWM dimming, over-temperature protection and the like are integrated in the chip. However, it should be noted that the above chip is not used to limit the present application, and any equivalent replacement of the present application by a control chip with the same function is included in the protection scope of the present application by way of example only. That is, the chip is not limited to the present application as long as the chip has the PWM dimming port, and the output current can be adjusted according to the PWM, and any equivalent replacement of the control chip, the topology, and the like with the same function is included in the protection scope of the present application. In this embodiment, the current adjusting signal is a square wave signal of thousands of HZ, and through the second control chip U2, the first pin DIM of the third control chip U3 and the fifth control chip U5 enters the second control chip U2, the third control chip U3, the fifth control chip U5, the second control chip U2, the third control chip U3, and the fifth control chip U5 determine the magnitude of the output current according to the PWM signal, so that the control of the magnitude of the current value of the output current is realized, the magnitude of the second direct current is adjusted by receiving the adjusting signal, and the requirements of different lamps on colors can be flexibly met without providing driving circuits of various types, so that the required material types are few, the production cost is reduced, the production flow is simplified, large-scale production is facilitated, and the production efficiency is improved.

In summary, the present application provides an LED driving circuit, which includes a constant voltage driving module, a current adjusting signal generating module, and a constant current module; the constant voltage driving module is connected with the external alternating current, receives the input of the external alternating current and converts the input of the external alternating current into a first direct current for output; the current adjusting signal generating module is connected with the constant voltage driving module and the constant current module, receives current adjusting setting information from the outside and outputs a current adjusting signal to the constant current module according to the current adjusting setting information; the constant current module is connected with the constant voltage driving module and the current adjusting signal generating module, and converts the first direct current into a second direct current with voltage lower than that of the first direct current according to the current adjusting signal output by the current adjusting signal generating module to supply the second direct current to the LED load. This application can export different electric currents according to the current regulation signal and give different LED loads, need not be equipped with multiple drive circuit just can satisfy the demand of different lamps and lanterns in a flexible way, and consequently required material kind is few, has reduced the cost of production, has simplified the production procedure, is favorable to carrying out large-scale production, has improved production efficiency.

The LED driving circuit provided by the present application is described in detail above, and the principle and the implementation of the present application are described herein by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An LED drive circuit is characterized by comprising a constant voltage drive module, a current regulation signal generation module and a constant current module;

the current adjusting signal generating module is connected with the constant current module, receives current adjusting setting information from the outside and outputs a current adjusting signal to the constant current module according to the current adjusting setting information;

2. The LED driving circuit according to claim 1, wherein the constant voltage driving module comprises an input rectifying unit, a constant voltage unit, and a first voltage dropping unit, the input rectifying unit comprising: the rectifier bridge, the second capacitor, the first input end and the second input end; the first input end is connected with the second end of the rectifier bridge, the second input end is connected with the third end of the rectifier bridge, the fourth end of the rectifier bridge is grounded, the first end of the rectifier bridge is connected with the first end of the second capacitor and the constant voltage unit, and the second end of the second capacitor is grounded.

3. The LED driving circuit according to claim 2, wherein the constant voltage unit comprises a first control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, an eighth resistor, a first capacitor, a sixth capacitor, a seventh capacitor, a first MOS transistor, a second diode, a third diode, and a third electrolytic capacitor; a first pin of the first control chip is connected with a gate of the first MOS transistor, a drain of the first MOS transistor is connected with a first end of the second diode and the first voltage-dropping unit, a second end of the second diode is connected with a first end of the first capacitor and a first end of the first resistor, a second end of the first capacitor is connected with a second end of the second resistor and the first voltage-dropping unit, a source of the first MOS transistor is connected with a first end of the eighth resistor and a second end of the fifth resistor, and a second end of the eighth resistor is grounded; a second pin of the first control chip is grounded; a third pin of the first control chip is connected with a first end of the seventh capacitor and a first end of the fifth resistor, a second end of the seventh capacitor is grounded, and a second end of the fifth resistor is connected with a first end of the eighth resistor; a fourth pin of the first control chip is connected with a first end of the second resistor and a first end of the sixth capacitor, a second end of the second resistor is connected with the input rectifying unit, and a second end of the sixth capacitor is grounded; the fifth pin of the first control chip is connected with the first end of the fourth resistor and the first end of the seventh resistor, the second end of the seventh resistor is grounded, the second end of the fourth resistor is connected with the first end of the third diode and the first voltage reduction unit, the second end of the third diode is connected with the first end of the third electrolytic capacitor, the first end of the third resistor and the sixth pin of the first control chip, the second end of the third electrolytic capacitor is grounded, and the second end of the third resistor is connected with the second end of the second resistor, the second end of the first capacitor and the first voltage reduction unit.

4. The LED driving circuit according to claim 3, wherein the first voltage reduction unit comprises a first transformer, a first electrolytic capacitor, a first diode; a first pin, a fourth pin and a sixth pin of the first transformer are connected with the constant voltage unit, and a fifth pin of the first transformer is grounded; a ninth pin of the first transformer is connected with a first end of the first diode, and a second end of the first diode is connected with a first end of the first electrolytic capacitor and the constant current module; the second end of the first electrolytic capacitor is grounded.

5. The LED driving circuit according to claim 1, wherein the current adjusting signal generating module comprises a fourth control chip, a fourth capacitor, a fifth capacitor, an eighth capacitor, a ninth resistor, a near field communication antenna; a first pin of the fourth control chip is connected with a first end of the ninth resistor, a second end of the ninth resistor is connected with the constant current module, and a second pin of the fourth control chip is connected with a first end of the fourth capacitor, a first end of the fifth capacitor and a first end of the near field communication antenna; a third pin of the fourth control chip is connected with a second end of the fourth capacitor, a second end of the fifth capacitor and a second end of the near field communication antenna; a fourth pin of the fourth control chip is grounded; a fifth pin of the fourth control chip is connected with the constant current module; a sixth pin of the fourth control chip is connected with the constant current module; and an eighth pin of the fourth control chip is connected with a first end of the eighth capacitor, and a second end of the eighth capacitor is grounded.

6. The LED driving circuit according to claim 1, wherein the constant current module comprises a third control chip, a ninth capacitor, a tenth resistor, a fifth diode, a third inductor and a fourth electrolytic capacitor; a first pin of the third control chip is connected with the current regulation signal generation module, a second pin of the third control chip is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with a fourth pin of the third control chip and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin of the third control chip is connected to the first end of the fifth diode and the first end of the third inductor, the second end of the fifth diode is connected to the first end of the fourth electrolytic capacitor, and the second end of the fourth electrolytic capacitor is connected to the second end of the third inductor.

7. The LED driving circuit according to claim 1, wherein the constant current modules comprise a first constant current module and a second constant current module, the first constant current module is connected to a warm LED load, and the second constant current module is connected to a cool LED load.

8. The LED driving circuit according to claim 7, wherein the first constant current module comprises: the second control chip, a sixth resistor, a third capacitor, a fourth diode, a second inductor and a second electrolytic capacitor; a first pin of the second control chip is connected with the current regulation signal generation module, a second pin of the second control chip is connected with a first end of the third capacitor, and a second end of the third capacitor is connected with a fourth pin of the second control chip and grounded; a fifth pin of the second control chip is connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded; a seventh pin of the second control chip is connected to a first end of the fourth diode and a first end of the second inductor, a second end of the fourth diode is connected to a first end of the second electrolytic capacitor, and a second end of the second electrolytic capacitor is connected to a second end of the second inductor;

the second constant current module comprises: the third control chip, a ninth capacitor, a tenth resistor, a fifth diode, a third inductor and a fourth electrolytic capacitor; a first pin of the third control chip is connected with the current regulation signal generation module, a second pin of the third control chip is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with a fourth pin of the third control chip and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin of the third control chip is connected to the first end of the fifth diode and the first end of the third inductor, the second end of the fifth diode is connected to the first end of the fourth electrolytic capacitor, and the second end of the fourth electrolytic capacitor is connected to the second end of the third inductor.

9. The LED driving circuit according to claim 1, wherein the constant current modules further comprise a first constant current module, a second constant current module and a third constant current module, the first constant current module is connected to a red LED load, the second constant current module is connected to a green LED load, and the third constant current module is connected to a blue LED load.

10. The LED driving circuit according to claim 9, wherein the first constant current module comprises: the second control chip, a sixth resistor, a third capacitor, a fourth diode, a second inductor and a second electrolytic capacitor; a first pin of the second control chip is connected with the current regulation signal generation module, a second pin of the second control chip is connected with a first end of the third capacitor, and a second end of the third capacitor is connected with a fourth pin of the second control chip and grounded; a fifth pin of the second control chip is connected with a first end of the sixth resistor, and a second end of the sixth resistor is grounded; a seventh pin of the second control chip is connected to a first end of the fourth diode and a first end of the second inductor, a second end of the fourth diode is connected to a first end of the second electrolytic capacitor, and a second end of the second electrolytic capacitor is connected to a second end of the second inductor;

the second constant current module comprises: the third control chip, the ninth capacitor, the tenth resistor, the fifth diode, the third inductor and the fourth electrolytic capacitor; a first pin of the third control chip is connected with the current regulation signal generation module, a second pin of the third control chip is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with a fourth pin of the third control chip and grounded; a fifth pin of the third control chip is connected with a first end of the tenth resistor, and a second end of the tenth resistor is grounded; a seventh pin of the third control chip is connected to a first end of the fifth diode and a first end of the third inductor, a second end of the fifth diode is connected to a first end of the fourth electrolytic capacitor, and a second end of the fourth electrolytic capacitor is connected to a second end of the third inductor;

the third constant current module comprises: the third control chip, the tenth capacitor, the eleventh resistor, the sixth diode, the fourth inductor and the fifth electrolytic capacitor are connected in series; a first pin of the fifth control chip is connected with the current regulation signal generation module, a second pin of the fifth control chip is connected with a first end of the tenth capacitor, and a second end of the tenth capacitor is connected with a fourth pin of the fifth control chip and grounded; a fifth pin of the fifth control chip is connected with a first end of the eleventh resistor, and a second end of the eleventh resistor is grounded; a seventh pin of the fifth control chip is connected to the first end of the sixth diode and the first end of the fourth inductor, the second end of the sixth diode is connected to the first end of the fifth electrolytic capacitor, and the second end of the fifth electrolytic capacitor is connected to the second end of the fourth inductor.