CN204482105U - LED intelligent dimming drive circuit - Google Patents
LED intelligent dimming drive circuit Download PDFInfo
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Abstract
Description
技术领域 technical field
本实用新型涉及一种LED照明灯具控制电路，特别是一种LED智能调光驱动电路。 The utility model relates to an LED lighting lamp control circuit, in particular to an LED intelligent dimming drive circuit.
背景技术 Background technique
技术的发展和人们生活水平的提高，照明领域中，由于LED光源具有发光效率高、低发热、省电和寿命长的优点，因此其应用越来越广泛。随着LED技术的不断发展，LED驱动电路也越来越多，大致可分为三种：阻限流驱动、恒流驱动和恒压驱动。由于使用时经常是单一驱动模式，便会出现调节性能差、颜色保真效果差或调节困难等问题。如授权公告日2010年9月15日，中国专利申请号200920261721.2，名称为《LED驱动电路》的实用新型，其包括滤波电路、整流滤波电路、带PFC校正的PWM控制电路、开关变压器、功率开关、输出整流滤波电路及环路控制电路，通过带PFC校正的PWM控制电路与环路控制电路形成电压环的补偿网络，在一定程度上实现了输出电压的负反馈，但仅仅使用一级驱动的恒压控制，很难保较小误差的恒压，因此，使得驱动器的效率较低。 With the development of technology and the improvement of people's living standards, in the field of lighting, LED light sources are more and more widely used because of their advantages of high luminous efficiency, low heat generation, power saving and long life. With the continuous development of LED technology, there are more and more LED drive circuits, which can be roughly divided into three types: resistance current-limited drive, constant current drive and constant voltage drive. Because it is often used in a single drive mode, problems such as poor adjustment performance, poor color fidelity, or difficult adjustment can occur. For example, the authorized announcement date was September 15, 2010, and the Chinese patent application number 200920261721.2 is a utility model named "LED Drive Circuit", which includes a filter circuit, a rectifier filter circuit, a PWM control circuit with PFC correction, a switching transformer, and a power switch. , Output rectification filter circuit and loop control circuit, through the PWM control circuit with PFC correction and the loop control circuit to form a compensation network of the voltage loop, to a certain extent, the negative feedback of the output voltage is realized, but only one level of drive is used Constant voltage control, it is difficult to maintain a constant voltage with a small error, so the efficiency of the driver is low.
实用新型内容 Utility model content
有鉴于此，有必要提供一种结构简单、驱动效率高的LED智能调光驱动电路。 In view of this, it is necessary to provide an LED intelligent dimming driving circuit with simple structure and high driving efficiency.
一种LED智能调光驱动电路，包括AC/DC整流模块、MCU控制单元、DC/DC变换器以及LED光源，该AC/DC整流模块与该DC/DC变换器连接，该DC/DC变换器的输出端与该LED光源连接，该AC/DC整流模块包括控制器，该MCU控制单元与该DC/DC变换器连接，该MCU控制单元还与该控制器连接，该MCU控制单元中包括电压检测器，该电压检测器用于检测该DC/DC变换器两端的电压，当该电压检测器检测到该DC/DC变换器两端的电压超过预定值后，该MCU控制单元向该控制器发出控制信号，该控制器根据该控制信号调整该AC/DC整流模块输出给该DC/DC变换器的电压，从而确保该DC/DC变换器两端的电压在预定值之内。 An LED intelligent dimming drive circuit includes an AC/DC rectifier module, an MCU control unit, a DC/DC converter and an LED light source, the AC/DC rectifier module is connected to the DC/DC converter, and the DC/DC converter The output end of the LED light source is connected to the LED light source, the AC/DC rectification module includes a controller, the MCU control unit is connected to the DC/DC converter, the MCU control unit is also connected to the controller, and the MCU control unit includes a voltage A detector, the voltage detector is used to detect the voltage across the DC/DC converter, when the voltage detector detects that the voltage across the DC/DC converter exceeds a predetermined value, the MCU control unit sends a control to the controller signal, the controller adjusts the voltage output from the AC/DC rectification module to the DC/DC converter according to the control signal, so as to ensure that the voltage across the DC/DC converter is within a predetermined value.
与现有技术相比，LED智能调光驱动电路通过设置电压检测模块用于实时检测DC/DC变换器两端的电压并进行比较换算后输出控制信号，该控制信号反馈到控制器，控制器根据该控制信号调整AC/DC整流模块的输出电压。使得AC/DC整流模块的输出电压随着该DC/DC变换器两端的电压的变化而变化，将二者的差值恒定在一个很小的预定值之内，保证了驱动器的高效率。 Compared with the existing technology, the LED intelligent dimming drive circuit is used to detect the voltage at both ends of the DC/DC converter in real time by setting a voltage detection module, and then output a control signal after comparison and conversion. The control signal is fed back to the controller, and the controller according to The control signal adjusts the output voltage of the AC/DC rectification module. The output voltage of the AC/DC rectifier module changes with the change of the voltage at both ends of the DC/DC converter, and the difference between the two is kept within a small predetermined value, which ensures the high efficiency of the driver.
附图说明 Description of drawings
图1是本实用新型第一实施例的LED智能调光驱动电路的结构示意图。 FIG. 1 is a schematic structural diagram of an LED intelligent dimming drive circuit according to a first embodiment of the present invention.
具体实施方式 Detailed ways
下面结合附图与具体实施方式对本实用新型作进一步详细描述。 Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.
本实用新型第一实施例的LED智能调光驱动电路100，请参考图1。 Please refer to FIG. 1 for the LED intelligent dimming driving circuit 100 of the first embodiment of the present invention.
请参考图1，该LED智能调光驱动电路100主要包括AC/DC整流模块10、MCU控制单元40、DC/DC变换器20以及LED光源30。该AC/DC整流模块10与该DC/DC变换器20连接，该DC/DC变换器20的输出端与该LED光源30连接，该AC/DC整流模块10包括控制器，该MCU控制单元40与该DC/DC变换器20连接，该MCU控制单元40还与该控制器连接，该MCU控制单元40中包括电压检测器，该电压检测器用于检测该DC/DC变换器20两端的电压，当该电压检测器检测到该DC/DC变换器20两端的电压超过预定值后，该MCU控制单元40向该控制器发出控制信号50，该控制器根据该控制信号50调整该AC/DC整流模块10输出给该DC/DC变换器20的电压，从而确保该DC/DC变换器20两端的电压在预定值之内。 Please refer to FIG. 1 , the LED intelligent dimming driving circuit 100 mainly includes an AC/DC rectification module 10 , an MCU control unit 40 , a DC/DC converter 20 and an LED light source 30 . The AC/DC rectification module 10 is connected to the DC/DC converter 20, the output end of the DC/DC converter 20 is connected to the LED light source 30, the AC/DC rectification module 10 includes a controller, and the MCU control unit 40 Connected with the DC/DC converter 20, the MCU control unit 40 is also connected with the controller, the MCU control unit 40 includes a voltage detector, and the voltage detector is used to detect the voltage at both ends of the DC/DC converter 20, When the voltage detector detects that the voltage across the DC/DC converter 20 exceeds a predetermined value, the MCU control unit 40 sends a control signal 50 to the controller, and the controller adjusts the AC/DC rectifier according to the control signal 50 The voltage output from the module 10 to the DC/DC converter 20 ensures that the voltage across the DC/DC converter 20 is within a predetermined value.
该DC/DC变换器20两端的电压的预定值的范围为1V-3V。该预定值的设置是为了将该DC/DC变换器20两端的电压限定在比较小的范围内，提高电路整体的工作效率。该电压检测器与该DC/DC变换器20并联。包括多个LED光源30，所述LED光源并联连接在该DC/DC变换器20的输出端。 The predetermined value of the voltage across the DC/DC converter 20 is in the range of 1V-3V. The purpose of setting the predetermined value is to limit the voltage across the DC/DC converter 20 to a relatively small range, so as to improve the overall working efficiency of the circuit. The voltage detector is connected in parallel with the DC/DC converter 20 . It includes a plurality of LED light sources 30 connected in parallel to the output end of the DC/DC converter 20 .
该AC/DC整流模块10还包括变压器绕组，该DC/DC变换器20连接在该变压器绕组的次级绕组上。 The AC/DC rectification module 10 also includes a transformer winding, and the DC/DC converter 20 is connected to the secondary winding of the transformer winding.
该控制器用于产生第一PWM调光控制信号，根据该第一PWM调光控制信号，调整AC/DC整流模块10的输出电流的占空比，从而实现对这些LED光源30亮度或其他参数的调节。该MCU控制单元40用于产生第二PWM调光控制信号。该第二PWM调光控制信号为该MCU控制单元40根据所检测到的DC/DC变换器20两端的电压经过换算所产生的信号。该第二PWM调光信号作为电流将直接供给该LED光源30。 The controller is used to generate a first PWM dimming control signal, and adjust the duty cycle of the output current of the AC/DC rectifier module 10 according to the first PWM dimming control signal, so as to realize the brightness or other parameters of these LED light sources 30. adjust. The MCU control unit 40 is used for generating a second PWM dimming control signal. The second PWM dimming control signal is a signal generated by the MCU control unit 40 after conversion according to the detected voltage across the DC/DC converter 20 . The second PWM dimming signal will be directly supplied to the LED light source 30 as current.
该MCU控制单元40根据该电压检测器的检测结果产生第三PWM调光控制信号并将该第三PWM调光控制信号输出给该控制器。该控制器根据该第三PWM调光控制信号与预定值换算后，产生第一PWM调光控制信号。 The MCU control unit 40 generates a third PWM dimming control signal according to the detection result of the voltage detector and outputs the third PWM dimming control signal to the controller. The controller converts the third PWM dimming control signal to a predetermined value to generate a first PWM dimming control signal.
由于该电压检测器实时检测该DC/DC变换器20两端的电压，并且实时的将控制信号50反馈给AC/DC整流模块10，因此AC/DC整流模块10能够实时的调整输出电压，从而保证了AC/DC整流模块10输出电压与负载电压的差值恒定，使得驱动器具有高效率。工作时，如果使用者需要降低该LED光源30的亮度，则可以通过遥控器或开关等改变该第一PWM调光控制信号。这样，该DC/DC变换器20两端的电压就会相应发生变化。该电压检测器检测到这种变化并将信号通过该MCU控制单元40传递给该控制器。从而实现整个电路对DC/DC变换器20两端的电压的实时响应。 Since the voltage detector detects the voltage at both ends of the DC/DC converter 20 in real time, and feeds back the control signal 50 to the AC/DC rectification module 10 in real time, the AC/DC rectification module 10 can adjust the output voltage in real time, thereby ensuring The difference between the output voltage of the AC/DC rectifier module 10 and the load voltage is kept constant, so that the driver has high efficiency. During operation, if the user needs to reduce the brightness of the LED light source 30, the first PWM dimming control signal can be changed through a remote controller or a switch. In this way, the voltage across the DC/DC converter 20 will change accordingly. The voltage detector detects this change and transmits a signal to the controller through the MCU control unit 40 . Thus, the real-time response of the entire circuit to the voltage at both ends of the DC/DC converter 20 is realized.
综上所述，该LED智能调光驱动电路100通过设置电压检测模块用于实时检测DC/DC变换器20两端的电压并进行比较换算后输出控制信号50，该控制信号50反馈到控制器，控制器根据该控制信号调整AC/DC整流模块10的输出电压。使得AC/DC整流模块10的输出电压随着LED光源30的负载电压变化而变化，使得LED光源30的负载电压与AC/DC整流模块10的输出电压的差值恒定在一个很小的值，保证了驱动器的高效率。 To sum up, the LED intelligent dimming drive circuit 100 uses a voltage detection module to detect the voltage at both ends of the DC/DC converter 20 in real time, compare and convert the voltage and output the control signal 50, and the control signal 50 is fed back to the controller. The controller adjusts the output voltage of the AC/DC rectification module 10 according to the control signal. Make the output voltage of the AC/DC rectification module 10 change with the load voltage of the LED light source 30, so that the difference between the load voltage of the LED light source 30 and the output voltage of the AC/DC rectification module 10 is constant at a very small value, The high efficiency of the drive is guaranteed.
以上所述仅为本实用新型的较佳实施例而已，并不用以限制本实用新型，凡在本实用新型的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本实用新型保护的范围之内。 The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present utility model shall include Within the protection scope of the utility model.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684227A (en) * | 2015-03-27 | 2015-06-03 | 立达信绿色照明股份有限公司 | LED intelligent light adjustment driving circuit |
| WO2019100274A1 (en) * | 2017-11-23 | 2019-05-31 | 沈佩军 | Fan527b-based led tunnel lamp driver |
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2015
- 2015-03-27 CN CN201520175830.8U patent/CN204482105U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684227A (en) * | 2015-03-27 | 2015-06-03 | 立达信绿色照明股份有限公司 | LED intelligent light adjustment driving circuit |
| CN104684227B (en) * | 2015-03-27 | 2019-05-17 | 漳州立达信光电子科技有限公司 | LED intelligent dimming drive circuit |
| WO2019100274A1 (en) * | 2017-11-23 | 2019-05-31 | 沈佩军 | Fan527b-based led tunnel lamp driver |
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Effective date of registration: 20170124 Address after: Xingtai Industrial Park Economic Development Zone, Changtai County, Fujian city of Zhangzhou province 363999 Patentee after: ZHANGZHOU LIDAXIN PHOTOELECTRON TECHNOLOGY CO., LTD. Address before: 361010 Fujian city of Zhangzhou province Changtai Xingtai County Development Zone Patentee before: Leedarson Green Lighting Co., Ltd. |