CN105472818A - LED lighting circuit - Google Patents
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- CN105472818A CN105472818A CN201610021008.5A CN201610021008A CN105472818A CN 105472818 A CN105472818 A CN 105472818A CN 201610021008 A CN201610021008 A CN 201610021008A CN 105472818 A CN105472818 A CN 105472818A
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- 239000011324 bead Substances 0.000 claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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Abstract
Description
技术领域technical field
本发明涉及一种电路，尤其涉及一种LED照明电路。The invention relates to a circuit, in particular to an LED lighting circuit.
背景技术Background technique
发光二极管是一种能发光的半导体电子元件。LED具有效率高、寿命长、不易破损、开关速度高、高可靠性等传统光源所不具备的优点，因此LED作为照明光源被广泛应用于各个领域。A light emitting diode is a semiconductor electronic component that emits light. LED has the advantages of high efficiency, long life, not easy to break, high switching speed, high reliability, etc. that traditional light sources do not have, so LED is widely used as a lighting source in various fields.
由于LED的发光特性通常都表述为电流的函数，而不是电压的函数，因此，采用恒流源驱动可以更好地控制LED的亮度。此外LED的正向压降变化范围较大，正向电压的微小变化会引起较大的正向电流变化，从而引起亮度的较大变化。所以，采用恒压源驱动不能保证LED亮度的一致性，并且影响LED的可靠性、寿命和光衰。因此，高亮度LED通常采用恒流源驱动。Since the luminous characteristics of LEDs are usually expressed as a function of current rather than voltage, the brightness of LEDs can be better controlled by driving with a constant current source. In addition, the forward voltage drop of the LED has a large range of changes, and a small change in the forward voltage will cause a large change in the forward current, thereby causing a large change in brightness. Therefore, using a constant voltage source to drive cannot guarantee the consistency of the LED brightness, and affects the reliability, life and light decay of the LED. Therefore, high-brightness LEDs are usually driven by a constant current source.
目前市场上的LED驱动电路，单个灯珠的损坏容易引起整个电路的运行不畅，同时元器件设置的不合理导致工程安装难度增加。In the current LED drive circuit on the market, damage to a single lamp bead can easily cause poor operation of the entire circuit. At the same time, unreasonable component settings increase the difficulty of engineering installation.
发明内容Contents of the invention
本发明的目的是为了解决背景技术中所涉及的技术问题，提供了一种LED照明电路。The object of the present invention is to provide an LED lighting circuit in order to solve the technical problems involved in the background art.
本发明的技术方案为：Technical scheme of the present invention is:
一种LED照明电路，包括整流桥电路、LED灯珠组和线性恒流IC；An LED lighting circuit, including a rectifier bridge circuit, an LED lamp bead group and a linear constant current IC;
所述整流桥电路，用于将来自交流电源的交流电压整流后转化为直流电压；The rectifier bridge circuit is used to rectify the AC voltage from the AC power supply and convert it into a DC voltage;
所述线性恒流IC，用于将来自所述整流桥电路的直流电压转化为恒定大小的直流电流；The linear constant current IC is used to convert the DC voltage from the rectifier bridge circuit into a constant DC current;
所述LED灯珠组设有数个互相串联的灯珠串，每个所述灯珠串设有数个互相并联的LED灯珠。The LED lamp bead group is provided with several lamp bead strings connected in series, and each of the lamp bead strings is provided with several LED lamp beads connected in parallel.
优选地，所述取样反馈电阻和缓冲电容，所述LED灯珠组、取样反馈电阻和线性恒流IC依次串接，所述缓冲电容设有2个，其中一个并联在LED灯珠组、取样反馈电阻和线性恒流IC的串接电路外，另一个并联在线性恒流IC外。Preferably, the sampling feedback resistor and buffer capacitor, the LED lamp bead group, the sampling feedback resistor and the linear constant current IC are sequentially connected in series, and there are two buffer capacitors, one of which is connected in parallel to the LED lamp bead group, sampling Outside the series circuit of the feedback resistor and the linear constant current IC, the other is connected in parallel outside the linear constant current IC.
优选地，所述整流桥电路设有二极管D1、D2、D3和D4，所述二极管D1的负极和二极管D2的负极串接作为供电电路的一极，所述二极管D3的正极和二极管D4的正极串接作为供电电路的另一极，所述二极管D1的正极和二极管D3的负极串接作为交流电源输入的一端，所述二极管D2的正极和二极管D4的负极串接作为交流电源输入的另一端。Preferably, the rectifier bridge circuit is provided with diodes D1, D2, D3 and D4, the cathode of the diode D1 and the cathode of the diode D2 are connected in series as one pole of the power supply circuit, the anode of the diode D3 and the anode of the diode D4 Connect in series as the other pole of the power supply circuit, the anode of the diode D1 and the cathode of the diode D3 are connected in series as one end of the AC power input, and the anode of the diode D2 and the cathode of the diode D4 are connected in series as the other end of the AC power input .
优选地，所述线性恒流IC为SO-8封装或TO252-2封装或SOT89-3封装。Preferably, the linear constant current IC is packaged in SO-8 or TO252-2 or SOT89-3.
优选地，所述线性恒流IC采用CYT1000A芯片或CYT1000AE芯片或SM2082芯片。Preferably, the linear constant current IC adopts CYT1000A chip or CYT1000AE chip or SM2082 chip.
优选地，所述LED照明电路整体设置在电路板上，所述二极管D1和二极管D2位于电路板的一端，所述二极管D3和二极管D4位于电路板的另一端，所述二极管D1的正极和二极管D3的负极通过铜皮相连接，所述二极管D2的正极和二极管D4的负极通过铜皮相连接。Preferably, the LED lighting circuit is integrally arranged on a circuit board, the diode D1 and the diode D2 are located at one end of the circuit board, the diode D3 and the diode D4 are located at the other end of the circuit board, and the anode of the diode D1 and the diode The negative pole of D3 is connected through the copper skin, and the positive pole of the diode D2 and the negative pole of the diode D4 are connected through the copper skin.
优选地，所述二极管D1、D2、D3和D4为IN4007型二极管。Preferably, the diodes D1, D2, D3 and D4 are IN4007 type diodes.
综上所述，本发明有以下优点：In summary, the present invention has the following advantages:
本发明结构紧凑，省去外置恒流驱动，降低了成本，恒流精度高。灯珠串并混排组合可以实现损坏一颗LED灯珠不影响其余LED的正常工作的效果，从而使得灯具影响使用的概率大大降低，从而达到延长使用寿命，减少维护次数及成本的作用。同时得线路板中供电的两根线路的铜皮可以达到最大程度的宽度，从而使此产品可以串接多个，节约了工程施工中布线线头数量，减少施工成本。The invention has compact structure, saves external constant current drive, reduces cost, and has high constant current precision. The combination of lamp bead strings and mixed rows can realize the effect that damaging one LED lamp bead will not affect the normal operation of the rest of the LEDs, so that the probability of affecting the use of the lamp is greatly reduced, thereby extending the service life, reducing maintenance times and costs. At the same time, the copper skins of the two power supply lines in the circuit board can reach the maximum width, so that this product can be connected in series, which saves the number of wiring heads in engineering construction and reduces construction costs.
附图说明Description of drawings
图1为本实施例电路原理图；Fig. 1 is the schematic circuit diagram of the present embodiment;
图2为本实施例的CYT1000A芯片的SO-8封装结构图；Fig. 2 is the SO-8 encapsulation structural diagram of the CYT1000A chip of the present embodiment;
图3为本实施例的TO252-2封装结构图；Fig. 3 is the TO252-2 encapsulation structure diagram of the present embodiment;
图4为本实施例的SOT89-3封装结构图。FIG. 4 is a structural diagram of the SOT89-3 package of this embodiment.
具体实施方式detailed description
如图1-4所示，一种LED照明电路，包括整流桥电路、LED灯珠组和线性恒流IC；As shown in Figure 1-4, an LED lighting circuit includes a rectifier bridge circuit, an LED lamp bead group and a linear constant current IC;
所述整流桥电路，用于将来自交流电源的交流电压整流后转化为直流电压；The rectifier bridge circuit is used to rectify the AC voltage from the AC power supply and convert it into a DC voltage;
所述线性恒流IC，用于将来自所述整流桥电路的直流电压转化为恒定大小的直流电流；The linear constant current IC is used to convert the DC voltage from the rectifier bridge circuit into a constant DC current;
所述LED灯珠组设有数个互相串联的灯珠串，每个所述灯珠串设有数个互相并联的LED灯珠。The LED lamp bead group is provided with several lamp bead strings connected in series, and each of the lamp bead strings is provided with several LED lamp beads connected in parallel.
LED灯珠串并混排组合可以实现损坏一颗LED灯珠不影响其余LED的正常工作的效果，只有在固定位连续相邻的三颗LED全部损坏的时候才会使灯具失去发光作用，从而使得灯具影响使用的概率大大降低，从而达到延长使用寿命，减少维护次数及成本的作用。所述LED串并混排电路中的灯珠数量可以根据灯珠额定电压不同等实际情况调整，也可用电阻或其他元件代替所空缺的灯珠来实现灯珠数量的增减。The combination of LED lamp bead strings and mixed rows can achieve the effect that damaging one LED lamp bead will not affect the normal operation of the rest of the LEDs. Only when the three consecutive adjacent LEDs at the fixed position are all damaged will the lamp lose its luminous effect, thereby The probability of lamps affecting the use is greatly reduced, thereby extending the service life and reducing maintenance times and costs. The number of lamp beads in the LED series-parallel mixed circuit can be adjusted according to the actual situation such as different rated voltages of the lamp beads, and resistors or other components can also be used to replace the vacant lamp beads to realize the increase or decrease of the number of lamp beads.
取样反馈电阻和缓冲电容，所述LED灯珠组、取样反馈电阻和线性恒流IC依次串接，所述缓冲电容设有2个，其中一个并联在LED灯珠组、取样反馈电阻和线性恒流IC的串接电路外，另一个并联在线性恒流IC外。The sampling feedback resistor and the buffer capacitor, the LED lamp bead group, the sampling feedback resistor and the linear constant current IC are sequentially connected in series, and there are two buffer capacitors, one of which is connected in parallel to the LED lamp bead group, the sampling feedback resistor and the linear constant current IC. Outside the series circuit of the current IC, the other is connected in parallel outside the linear constant current IC.
所述整流桥电路设有二极管D1、D2、D3和D4，所述二极管D1的负极和二极管D2的负极串接作为供电电路的一极，所述二极管D3的正极和二极管D4的正极串接作为供电电路的另一极，所述二极管D1的正极和二极管D3的负极串接作为交流电源输入的一端，所述二极管D2的正极和二极管D4的负极串接作为交流电源输入的另一端。The rectifier bridge circuit is provided with diodes D1, D2, D3 and D4, the negative pole of the diode D1 is connected in series with the negative pole of the diode D2 as one pole of the power supply circuit, and the positive pole of the diode D3 is connected in series with the positive pole of the diode D4 as the On the other pole of the power supply circuit, the anode of the diode D1 and the cathode of the diode D3 are connected in series as one end of the AC power input, and the anode of the diode D2 and the cathode of the diode D4 are connected in series as the other end of the AC power input.
所述线性恒流IC为SO-8封装或TO252-2封装或SOT89-3封装。所述线性恒流IC采用CYT1000A芯片或CYT1000AE芯片或SM2082芯片。The linear constant current IC is packaged in SO-8 or TO252-2 or SOT89-3. The linear constant current IC adopts CYT1000A chip or CYT1000AE chip or SM2082 chip.
TO252-2封装包含OUT端、GND端、电流取样反馈端(REXT)。所述芯片利用电流取样端外接电阻设置电流为5mA-60mA，且输出电流不随芯片OUT端口电压而变化。此IC内部集成温度补偿功能，当芯片内部结温超过100℃时将会自动减少输出电流以降低灯具内部温度，从而延长LED灯珠使用寿命。The TO252-2 package includes an OUT terminal, a GND terminal, and a current sampling feedback terminal (REXT). The chip uses an external resistor at the current sampling end to set the current to 5mA-60mA, and the output current does not change with the voltage of the OUT port of the chip. This IC integrates a temperature compensation function. When the internal junction temperature of the chip exceeds 100°C, it will automatically reduce the output current to reduce the internal temperature of the lamp, thereby prolonging the service life of the LED lamp bead.
所述LED照明电路整体设置在电路板上，所述二极管D1和二极管D2位于电路板的一端，所述二极管D3和二极管D4位于电路板的另一端，所述二极管D1的正极和二极管D3的负极通过铜皮相连接，所述二极管D2的正极和二极管D4的负极通过铜皮相连接。所述二极管D1、D2、D3和D4为IN4007型二极管。The LED lighting circuit is integrally arranged on the circuit board, the diode D1 and the diode D2 are located at one end of the circuit board, the diode D3 and the diode D4 are located at the other end of the circuit board, the anode of the diode D1 and the cathode of the diode D3 The anode of the diode D2 and the cathode of the diode D4 are connected through the copper skin. The diodes D1, D2, D3 and D4 are IN4007 type diodes.
这种结构使得线路板中供电的两根线路的铜皮可以达到最大程度的宽度，从而使此产品可以串接25-62个之多，节约了工程施工中布线线头数量，减少施工成本。This structure enables the copper skins of the two power supply lines in the circuit board to reach the maximum width, so that this product can be connected in series as many as 25-62, which saves the number of wiring heads in engineering construction and reduces construction costs.
本实施例的电路设计上除了可以使用市电(220V)供电之外，巧妙的兼容了可以使用低压(AC/DC24V)供电的电路结构。本实施例为6颗LED串接方式，为6串3并。在生产高压供电产品时所用灯珠为单颗36V电压、功率为0.3W-1W的特殊灯珠，配合集成线性恒流IC以及整流二极管即可实现完整功能。若生产成低压(AC/DC24V)供电的产品时，所使用的灯珠为单颗2.0V-3.8V电压、功率为0.05W-1W的灯珠，在此低压供电的产品中将不使用高压线性恒流IC，线路板结构上使用0R电阻等效跳线使其跳过IC部分，此时还需将灯珠中串接的电阻适当调节以分担一个回路中也就是六颗LED所无法承受的多余的供电电压，即24V-6*3.2V＝4.8V，即约4.8V左右的电压将由电路中间所串电阻来分担，其阻值可由欧姆定律计算出。In addition to being able to use commercial power (220V) for power supply, the circuit design of this embodiment is ingeniously compatible with a circuit structure that can be powered by low voltage (AC/DC24V). In this embodiment, 6 LEDs are connected in series, which is 6 strings and 3 parallels. The lamp bead used in the production of high-voltage power supply products is a single 36V voltage and a special lamp bead with a power of 0.3W-1W. It can realize complete functions with integrated linear constant current IC and rectifier diode. If it is produced into a low-voltage (AC/DC24V) powered product, the lamp bead used is a single 2.0V-3.8V voltage and a power of 0.05W-1W, and no high-voltage wire will be used in this low-voltage powered product For permanent constant current IC, 0R resistor equivalent jumper is used on the circuit board structure to make it skip the IC part. At this time, the resistor connected in series in the lamp bead needs to be adjusted properly to share the unbearable burden of six LEDs in one circuit. The redundant power supply voltage, that is, 24V-6*3.2V=4.8V, that is, the voltage of about 4.8V will be shared by the resistor connected in the middle of the circuit, and its resistance value can be calculated by Ohm's law.
以上说明仅仅是对本发明的解释，使得本领域普通技术人员能完整的实施本方案，但并不是对本发明的限制，本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性贡献的修改，这些都是不具有创造性的修改。但只要在本发明的权利要求范围内都受到专利法的保护。The above description is only an explanation of the present invention, so that those of ordinary skill in the art can implement the scheme completely, but it is not a limitation of the present invention. Those skilled in the art can make non-inventive changes to this embodiment as needed after reading this description. Contributed modifications, these are non-inventive modifications. But as long as it is within the scope of the claims of the present invention, it is protected by the patent law.
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| CN111935874A (en) * | 2018-04-20 | 2020-11-13 | 上海路傲电子科技有限公司 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
| CN111935874B (en) * | 2018-04-20 | 2023-09-05 | 上海路傲电子科技有限公司 | Linear constant current driving chip and multi-chip parallel LED lighting circuit |
| US11917737B2 (en) | 2021-08-02 | 2024-02-27 | Bio-Rad Laboratories, Inc. | Circuit for sharing current between parallel LEDs or parallel strings of LEDs |
| CN113709940A (en) * | 2021-09-26 | 2021-11-26 | 中山市文昊照明有限公司 | LED lamp driving-free circuit structure |
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| CN105472818B (en) | 2018-01-23 |
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Effective date of registration: 20180119 Address after: The new Mao Industrial Zone Qinglong road 528478 Guangdong city of Zhongshan province Henglan Town of the third floor of No. 5 Patentee after: Zhongshan Ju win Lighting Technology Co., Ltd. Address before: No. 026, pagazhen ruins, Huarong County, Yueyang, Hunan Patentee before: Li Shiyong |