CN204761769U - A LED control circuit - Google Patents
A LED control circuit Download PDFInfo
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- CN204761769U CN204761769U CN201520372226.4U CN201520372226U CN204761769U CN 204761769 U CN204761769 U CN 204761769U CN 201520372226 U CN201520372226 U CN 201520372226U CN 204761769 U CN204761769 U CN 204761769U
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Abstract
本实用新型公开了一种LED控制电路，包括变压器W、整流桥T、按键K1、电感L1和芯片IC1，所述变压器W的初级绕组N1的两端分别连接220V交流电的两端，变压器W的次级绕组N2的两端分别连接整流桥T的端口1和整流桥T的端口3，整流桥T的端口2连接电容C3、按键K1、电感L1和芯片IC1的引脚VIN。本实用新型LED控制电路采用新型DC/DC转换芯片作为电压控制元件，具有集成度高、控制精准的优点，电路中还设置了开路保护单元，因此电路具有结构简单、性能稳定、功能多样的优点。
The utility model discloses an LED control circuit, which comprises a transformer W, a rectifier bridge T, a button K1, an inductor L1 and a chip IC1. Both ends of the secondary winding N2 are respectively connected to port 1 of the rectifier bridge T and port 3 of the rectifier bridge T, and port 2 of the rectifier bridge T is connected to the capacitor C3, the button K1, the inductor L1 and the pin VIN of the chip IC1. The LED control circuit of the utility model adopts a new type of DC/DC conversion chip as a voltage control element, which has the advantages of high integration and precise control. An open circuit protection unit is also set in the circuit, so the circuit has the advantages of simple structure, stable performance and various functions. .
Description
技术领域 technical field
本实用新型涉及一种LED电路，具体是一种LED控制电路。 The utility model relates to an LED circuit, in particular to an LED control circuit.
背景技术 Background technique
LED灯因为具有耗能低、散热小灯优点被广泛应用于照明设备，而照明是日常生活中最重要的用电方式，由于LED灯具的驱动电压不同，而且对电压的要求较高，容易因过压、欠压等情况而烧毁，因此其驱动控制电路显得尤为重要，目前大部分的LED控制电路均存在结构复杂、输出不稳定的缺陷，而且功能较为单一，因此有待于改进。 LED lamps are widely used in lighting equipment because of their advantages of low energy consumption and small heat dissipation, and lighting is the most important way of using electricity in daily life. Burned due to overvoltage, undervoltage, etc., so its drive control circuit is particularly important. At present, most LED control circuits have defects of complex structure, unstable output, and relatively single function, so they need to be improved.
实用新型内容 Utility model content
本实用新型的目的在于提供一种结构简单、制作成本低的LED控制电路，以解决上述背景技术中提出的问题。 The purpose of this utility model is to provide an LED control circuit with simple structure and low manufacturing cost, so as to solve the problems raised in the above-mentioned background technology.
为实现上述目的，本实用新型提供如下技术方案： In order to achieve the above object, the utility model provides the following technical solutions:
一种LED控制电路，包括变压器W、整流桥T、按键K1、电感L1和芯片IC1，所述变压器W的初级绕组N1的两端分别连接220V交流电的两端，变压器W的次级绕组N2的两端分别连接整流桥T的端口1和整流桥T的端口3，整流桥T的端口2连接电容C3、按键K1、电感L1和芯片IC1的引脚VIN，电容C3的另一端连接电阻R1、电阻R3、电阻R4、电阻R5、电阻R6、电容C2、电容C3的另一端、电容C4、整流桥T的端口4、三极管V1的发射极和芯片IC1的引脚GND，按键K1的另一端连接电阻R1的另一端和芯片IC1的引脚SHDN，芯片IC1的引脚SW连接电感L1的另一端和电容C1，电容C1的另一端连接电感L2、LED灯组H和电容C4，电感L2的另一端接地，芯片IC1的引脚FB连接电容C2的另一端、电阻R2、芯片IC1的引脚4、三极管V1的集电极、芯片IC1的引脚VCC和芯片IC2的引脚4，芯片IC1的引脚1连接LED灯组H的另一端和电阻R6的另一端，三极管V1的基极连接电阻R3的另一端和电阻R4的另一端。 An LED control circuit, including a transformer W, a rectifier bridge T, a button K1, an inductor L1 and a chip IC1, the two ends of the primary winding N1 of the transformer W are respectively connected to the two ends of a 220V alternating current, the secondary winding N2 of the transformer W Both ends are respectively connected to port 1 of rectifier bridge T and port 3 of rectifier bridge T, port 2 of rectifier bridge T is connected to capacitor C3, key K1, inductor L1 and pin VIN of chip IC1, and the other end of capacitor C3 is connected to resistor R1, Resistor R3, resistor R4, resistor R5, resistor R6, capacitor C2, the other end of capacitor C3, capacitor C4, port 4 of rectifier bridge T, emitter of transistor V1 and pin GND of chip IC1, the other end of button K1 is connected The other end of the resistor R1 is connected to the pin SHDN of the chip IC1, the pin SW of the chip IC1 is connected to the other end of the inductor L1 and the capacitor C1, the other end of the capacitor C1 is connected to the inductor L2, the LED lamp group H and the capacitor C4, and the other end of the inductor L2 One end is grounded, the pin FB of the chip IC1 is connected to the other end of the capacitor C2, the resistor R2, the pin 4 of the chip IC1, the collector of the triode V1, the pin VCC of the chip IC1 and the pin 4 of the chip IC2, the lead of the chip IC1 Pin 1 is connected to the other end of the LED lamp group H and the other end of the resistor R6, and the base of the transistor V1 is connected to the other end of the resistor R3 and the other end of the resistor R4.
作为本实用新型的优选方案：所述芯片IC1的型号为LT3436。 As a preferred solution of the utility model: the model of the chip IC1 is LT3436.
作为本实用新型的优选方案：所述芯片IC2的型号为LM321。 As a preferred solution of the utility model: the model of the chip IC2 is LM321.
与现有技术相比，本实用新型的有益效果是：本实用新型LED调光驱动电路采用新型DC/DC转换芯片作为电压控制元件，具有集成度高、控制精准的优点，电路中还设置了开路保护单元，因此电路具有结构简单、性能稳定、功能多样的优点。 Compared with the prior art, the beneficial effect of the utility model is that the utility model LED dimming drive circuit adopts a new type of DC/DC conversion chip as a voltage control element, which has the advantages of high integration and precise control. Open circuit protection unit, so the circuit has the advantages of simple structure, stable performance and multiple functions.
附图说明 Description of drawings
图1为LED控制电路的电路图。 Figure 1 is a circuit diagram of the LED control circuit.
具体实施方式 Detailed ways
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。 The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
请参阅图1，一种LED控制电路，包括变压器W、整流桥T、按键K1、电感L1和芯片IC1，所述变压器W的初级绕组N1的两端分别连接220V交流电的两端，变压器W的次级绕组N2的两端分别连接整流桥T的端口1和整流桥T的端口3，整流桥T的端口2连接电容C3、按键K1、电感L1和芯片IC1的引脚VIN，电容C3的另一端连接电阻R1、电阻R3、电阻R4、电阻R5、电阻R6、电容C2、电容C3的另一端、电容C4、整流桥T的端口4、三极管V1的发射极和芯片IC1的引脚GND，按键K1的另一端连接电阻R1的另一端和芯片IC1的引脚SHDN，芯片IC1的引脚SW连接电感L1的另一端和电容C1，电容C1的另一端连接电感L2、LED灯组H和电容C4，电感L2的另一端接地，芯片IC1的引脚FB连接电容C2的另一端、电阻R2、芯片IC1的引脚4、三极管V1的集电极、芯片IC1的引脚VCC和芯片IC2的引脚4，芯片IC1的引脚1连接LED灯组H的另一端和电阻R6的另一端，三极管V1的基极连接电阻R3的另一端和电阻R4的另一端。 Please refer to Figure 1, an LED control circuit, including a transformer W, a rectifier bridge T, a button K1, an inductor L1 and a chip IC1, the two ends of the primary winding N1 of the transformer W are respectively connected to the two ends of the 220V alternating current, and the two ends of the transformer W The two ends of the secondary winding N2 are respectively connected to the port 1 of the rectifier bridge T and the port 3 of the rectifier bridge T, the port 2 of the rectifier bridge T is connected to the capacitor C3, the button K1, the inductor L1 and the pin VIN of the chip IC1, and the other terminal of the capacitor C3 One end is connected to resistor R1, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C2, the other end of capacitor C3, capacitor C4, port 4 of rectifier bridge T, emitter of transistor V1 and pin GND of chip IC1, press the button The other end of K1 is connected to the other end of the resistor R1 and the pin SHDN of the chip IC1, the pin SW of the chip IC1 is connected to the other end of the inductor L1 and the capacitor C1, and the other end of the capacitor C1 is connected to the inductor L2, the LED lamp group H and the capacitor C4 , the other end of the inductor L2 is grounded, the pin FB of the chip IC1 is connected to the other end of the capacitor C2, the resistor R2, the pin 4 of the chip IC1, the collector of the transistor V1, the pin VCC of the chip IC1 and the pin 4 of the chip IC2 , the pin 1 of the chip IC1 is connected to the other end of the LED lamp group H and the other end of the resistor R6, and the base of the transistor V1 is connected to the other end of the resistor R3 and the other end of the resistor R4.
芯片IC1的型号为LT3436。芯片IC2的型号为LM321。 The model of chip IC1 is LT3436. The model of chip IC2 is LM321.
本实用新型的工作原理是：220V交流电经过变压器W降压、整流桥T整流和电容C3滤波后变成稳定的直流电压给控制电路供电，控制电路采用LT3436构成的宽输入电压SEPIC驱动电路，可为LED灯组H提供700mA的驱动电流。变换器的输出电压为6.8V，即LED灯组H的正向电压。芯片IC1为带有高效、3A电流板载电源开关的散热增强型控制芯片，可简化稳压器设计和布局。它还能给LED驱动器提供足够电流而不过热。芯片IC2将芯片IC1从电流型、恒定输出的电压开关稳压器转换为了检测电阻功率损失最小的电流型恒流源变换器。按住开关K1按钮可点亮LED灯组H，松开开关K1关闭IC1，以限制IC1消耗电池功率，当电路中的LED灯组H出现开路时，电阻R3、电阻R4和三极管V1组成的限压电路有效的限制芯片IC1输出的电压，从而达到开路保护的目的。 The working principle of the utility model is: the 220V AC is stepped down by the transformer W, rectified by the rectifier bridge T and filtered by the capacitor C3, and then becomes a stable DC voltage to supply power to the control circuit. The control circuit adopts a wide input voltage SEPIC drive circuit composed of LT3436, which can Provide a driving current of 700mA for the LED lamp group H. The output voltage of the converter is 6.8V, which is the forward voltage of the LED lamp group H. Chip IC1 is a thermally enhanced control chip with a high-efficiency, 3A current on-board power switch that simplifies regulator design and layout. It can also provide enough current to the LED driver without overheating. Chip IC2 converts chip IC1 from a current-mode, constant-output voltage switching regulator to a current-mode constant-current source converter with minimal power loss in the sense resistor. Press and hold the switch K1 button to light up the LED light group H, and release the switch K1 to turn off IC1 to limit the battery power consumed by IC1. The voltage circuit effectively limits the voltage output by the chip IC1, so as to achieve the purpose of open circuit protection.
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| CN201520372226.4U CN204761769U (en) | 2015-06-02 | 2015-06-02 | A LED control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106369492A (en) * | 2016-10-20 | 2017-02-01 | 桂林大创科技有限公司 | Electronic illuminating device under humid environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106369492A (en) * | 2016-10-20 | 2017-02-01 | 桂林大创科技有限公司 | Electronic illuminating device under humid environment |
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Granted publication date: 20151111 Termination date: 20160602 |
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| CF01 | Termination of patent right due to non-payment of annual fee |