CN107613611B - AC and DC automatic switching LED lights - Google Patents
AC and DC automatic switching LED lights Download PDFInfo
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Abstract
本发明提供一种交流、直流自动切换LED灯，其包括AC恒流源与DC恒流源，所述AC恒流源与DC恒流源之间设有自动切换电路，所述自动切换电路与LED灯连接，所述自动切换电路包括设置在AC恒流源的一个输出端的钳位电阻RVOP，所述钳位电阻RVOP的另一端则直接与DC恒流源的触发端连接，所述钳位电阻RVOP在所述AC恒流源输出电压时，使得DC恒流源处于睡眠状态，在所述AC恒流源不输出电压时，则使得DC恒流源处于工作状态，通过在AC恒流源与DC恒流源之间设置钳位电阻，实现了AC恒流源与DC恒流源之间的瞬时切换，使得LED灯处于不间断的照明状态。
The invention provides an AC and DC automatic switching LED lamp, which includes an AC constant current source and a DC constant current source. An automatic switching circuit is provided between the AC constant current source and the DC constant current source. The automatic switching circuit is connected to The LED lamp is connected, and the automatic switching circuit includes a clamp resistor RVOP set at one output end of the AC constant current source. The other end of the clamp resistor RVOP is directly connected to the trigger end of the DC constant current source. The clamp The resistor RVOP causes the DC constant current source to be in a sleep state when the AC constant current source outputs a voltage, and causes the DC constant current source to be in a working state when the AC constant current source does not output a voltage. A clamping resistor is set between the LED and the DC constant current source to realize instantaneous switching between the AC constant current source and the DC constant current source, so that the LED lamp is in an uninterrupted lighting state.
Description
技术领域Technical field
本发明涉及照明技术领域，尤其是涉及一种交流、直流自动切换LED灯。The invention relates to the field of lighting technology, and in particular to an AC and DC automatic switching LED lamp.
背景技术Background technique
全球性的能源短缺和环境污染在经济高速发展进程中表现得尤为突出，节能和环保是实现社会经济可持续发展所急需解决的问题。 每年照明电能消耗约占全部电能消耗的 12%~15%，作为能源消耗的大户，必须尽快寻找到办法解决这个难题。目前，有两种方法可以减少社会资源的消耗 ：一是节约能源，减少浪费，即通过科技和生产工艺的发展，生成更加节能型的产品，如较低功率需求、较好驱动特性、较快响应速度、较高抗震能力、较长使用寿命、绿色环保以及不断快速提高的发光效率的 LED 灯 ；二是利用科学技术，如人体动能或太阳能的驱动来点亮光源。Global energy shortages and environmental pollution are particularly prominent in the process of rapid economic development. Energy conservation and environmental protection are urgent issues that need to be solved to achieve sustainable social and economic development. Lighting electricity consumption accounts for about 12% to 15% of all electricity consumption every year. As a major energy consumer, we must find a way to solve this problem as soon as possible. At present, there are two ways to reduce the consumption of social resources: one is to save energy and reduce waste, that is, through the development of science and technology and production processes, more energy-saving products are generated, such as lower power requirements, better driving characteristics, faster LED lights have response speed, high earthquake resistance, long service life, green environmental protection and rapidly improving luminous efficiency; the second is to use science and technology, such as human body kinetic energy or solar energy to drive the light source.
目前，在一般情况下，LED是由交流电源进行供电的，因此，相应的LED驱动电路也主要是针对交流电源进行设计的，而在某些情况下，LED也可通过直流电源进行供电，则相应的LED驱动电流源也是按照直流电源设计的，两者不能兼容。At present, under normal circumstances, LEDs are powered by AC power. Therefore, the corresponding LED drive circuit is mainly designed for AC power. In some cases, LEDs can also be powered by DC power, then The corresponding LED driving current source is also designed according to the DC power supply, and the two are not compatible.
然而在某些特殊场合，如舰船上，LED灯具需要在交流电源出现故障时，改由应急电源进行供电，而应急电源则是直流电源，因此需要设计一种能够自动切换直流和交流供电方式的LED灯，来适应舰船等环境的需求。However, in some special occasions, such as on ships, LED lamps need to be powered by the emergency power supply when the AC power supply fails. The emergency power supply is DC power supply. Therefore, it is necessary to design a power supply that can automatically switch between DC and AC power supply. LED lights to adapt to the needs of ships and other environments.
发明内容Contents of the invention
为了克服以上的技术不足，本发明提供一种交流、直流自动切换LED灯。In order to overcome the above technical deficiencies, the present invention provides an AC and DC automatic switching LED lamp.
本发明提供一种交流、直流自动切换LED灯，其包括AC恒流源与DC恒流源，所述AC恒流源与DC恒流源之间设有自动切换电路，所述自动切换电路与LED灯连接，所述自动切换电路包括设置在AC恒流源的一个输出端的钳位电阻RVOP，所述钳位电阻RVOP的另一端则直接与DC恒流源的触发端连接，所述钳位电阻RVOP在所述AC恒流源输出电压时，使得DC恒流源处于睡眠状态，在所述AC恒流源不输出电压时，则使得DC恒流源处于工作状态。The invention provides an AC and DC automatic switching LED lamp, which includes an AC constant current source and a DC constant current source. An automatic switching circuit is provided between the AC constant current source and the DC constant current source. The automatic switching circuit is connected to The LED lamp is connected, and the automatic switching circuit includes a clamp resistor RVOP set at one output end of the AC constant current source. The other end of the clamp resistor RVOP is directly connected to the trigger end of the DC constant current source. The clamp The resistor RVOP causes the DC constant current source to be in a sleep state when the AC constant current source outputs a voltage, and causes the DC constant current source to be in a working state when the AC constant current source does not output a voltage.
所述DC恒流源包括恒流芯片U2以及直流输入电路，恒流芯片U2的触发端与钳位电阻RVOP连接，恒流芯片U2的控制端与开关电路连接，直流输入电路的输出端有开关电路控制通断，并对恒流芯片U2提供电源。The DC constant current source includes a constant current chip U2 and a DC input circuit. The trigger end of the constant current chip U2 is connected to the clamp resistor RVOP. The control end of the constant current chip U2 is connected to the switch circuit. The output end of the DC input circuit has a switch. The circuit controls on and off and provides power to the constant current chip U2.
直流输入电路包括依次连接的输入端、整流电路、滤波电路，所述滤波电路的输出端串联电感L3后与开关电路连接。The DC input circuit includes an input terminal, a rectifier circuit, and a filter circuit connected in sequence. The output terminal of the filter circuit is connected in series with an inductor L3 and then connected to the switch circuit.
所述开关电路包括场效应管M1，场效应管M1的G极与恒流芯片U2的门端连接，场效应管M1的D极接在电感L3和二极管D10之间，场效应管M1的S极串联电阻R15接地。The switch circuit includes a field effect transistor M1. The G pole of the field effect transistor M1 is connected to the gate end of the constant current chip U2. The D pole of the field effect transistor M1 is connected between the inductor L3 and the diode D10. The S pole of the field effect transistor M1 is connected to the gate terminal of the constant current chip U2. The series resistor R15 is connected to ground.
所述钳位电阻RVOP与恒流芯片U2的触发端之间分别通过电阻R16与二极管D10连接以及电阻R17接地。The clamping resistor RVOP and the trigger end of the constant current chip U2 are respectively connected to the diode D10 through a resistor R16 and connected to the ground through a resistor R17.
所述恒流芯片U2的型号为SN3948。The model of the constant current chip U2 is SN3948.
所述AC恒流源包括恒流芯片U1以及交直流转换电路。The AC constant current source includes a constant current chip U1 and an AC-DC conversion circuit.
所述恒流芯片U1的型号为RED2401。The model of the constant current chip U1 is RED2401.
所述DC恒流源与所述LED灯集成为一体。The DC constant current source is integrated with the LED lamp.
所述AC恒流源可外接。The AC constant current source can be connected externally.
本发明的有益效果：通过在AC恒流源与DC恒流源之间设置钳位电阻，在AC恒流源有输出电压时，则使得DC恒流源进入休眠状态，而在AC恒流源无输出电压时，则该钳位电阻使得DC恒流源得到启动信号，直接切换DC恒流源供电，而在AC恒流源一有输出电压立即停止DC恒流源，实现了AC恒流源与DC恒流源之间的瞬时切换，使得LED灯处于不间断的照明状态。Beneficial effects of the present invention: by setting a clamping resistor between the AC constant current source and the DC constant current source, when the AC constant current source has an output voltage, the DC constant current source enters a dormant state, and when the AC constant current source has an output voltage, When there is no output voltage, the clamping resistor causes the DC constant current source to get a start signal and directly switches the DC constant current source for power supply. When the AC constant current source has an output voltage, it immediately stops the DC constant current source, realizing the AC constant current source. Instantaneous switching between the DC constant current source and the DC constant current source puts the LED lamp in an uninterrupted lighting state.
附图说明Description of the drawings
图1为本发明的AC恒流源的电路原理图。Figure 1 is a schematic circuit diagram of the AC constant current source of the present invention.
图2为本发明的DC恒流源的电路原理图。Figure 2 is a schematic circuit diagram of the DC constant current source of the present invention.
图3为本发明的LED灯的电路原理图。Figure 3 is a schematic circuit diagram of the LED lamp of the present invention.
图4、图5、图6、图7为图1的裁剪后的示意图。Figures 4, 5, 6, and 7 are cropped schematic diagrams of Figure 1.
实施方式Implementation
下面结合附图对本发明实施例作进一步说明：The embodiments of the present invention will be further described below in conjunction with the accompanying drawings:
如图所示，本发明提供一种交流、直流自动切换LED灯，其包括AC恒流源与DC恒流源，所述AC恒流源与DC恒流源之间设有自动切换电路，所述自动切换电路与LED灯连接，所述自动切换电路包括设置在AC恒流源的一个输出端的钳位电阻RVOP，所述钳位电阻RVOP的另一端则直接与DC恒流源的触发端连接，所述钳位电阻RVOP在所述AC恒流源输出电压时，使得DC恒流源处于睡眠状态，在所述AC恒流源不输出电压时，则使得DC恒流源处于工作状态。As shown in the figure, the present invention provides an AC and DC automatic switching LED lamp, which includes an AC constant current source and a DC constant current source. An automatic switching circuit is provided between the AC constant current source and the DC constant current source. The automatic switching circuit is connected to the LED lamp. The automatic switching circuit includes a clamp resistor RVOP set at one output end of the AC constant current source. The other end of the clamp resistor RVOP is directly connected to the trigger end of the DC constant current source. , the clamping resistor RVOP causes the DC constant current source to be in a sleep state when the AC constant current source outputs a voltage, and causes the DC constant current source to be in a working state when the AC constant current source does not output a voltage.
当AC恒流源、DC恒流源均上电时AC恒流源与DC恒流源均开始启动，由于DC恒流源设置RVOP钳位电压，DC恒流源驱动检测到RVOP钳位电压时，DC恒流源处于睡眠状态，DC恒流源驱动无任何输出，LED发光由AC恒流源驱动输出实现。When both the AC constant current source and the DC constant current source are powered on, both the AC constant current source and the DC constant current source start. Since the DC constant current source sets the RVOP clamping voltage, the DC constant current source driver detects the RVOP clamping voltage. , the DC constant current source is in sleep state, the DC constant current source driver has no output, and the LED lighting is realized by the AC constant current source driver output.
当AC恒流源失电压时，DC恒流源得不到RVOP钳位电压，DC恒流源从睡眠状态立刻进入正常工作状态，LED有DC恒流源输出发光。When the AC constant current source loses voltage, the DC constant current source does not get the RVOP clamping voltage, the DC constant current source immediately enters the normal working state from the sleep state, and the LED has the DC constant current source output to emit light.
其特点时当AC恒流源、DC恒流源同时供电时，AC恒流源优先工作有输出，DC恒流源处于睡眠状态无输出。Its characteristic is that when the AC constant current source and DC constant current source are powered at the same time, the AC constant current source works first and has output, and the DC constant current source is in sleep state and has no output.
AC恒流源失电，DC恒流源立刻有输出，LED发光处于不间断状态。When the AC constant current source loses power, the DC constant current source outputs immediately, and the LED light is in an uninterrupted state.
所述DC恒流源包括恒流芯片U2以及直流输入电路，恒流芯片U2的触发端与钳位电阻RVOP连接，恒流芯片U2的控制端与开关电路连接，直流输入电路的输出端有开关电路控制通断，并对恒流芯片U2提供电源。The DC constant current source includes a constant current chip U2 and a DC input circuit. The trigger end of the constant current chip U2 is connected to the clamp resistor RVOP. The control end of the constant current chip U2 is connected to the switch circuit. The output end of the DC input circuit has a switch. The circuit controls on and off and provides power to the constant current chip U2.
直流输入电路包括依次连接的输入端、整流电路、滤波电路，所述滤波电路的输出端串联电感L3后与开关电路连接。The DC input circuit includes an input terminal, a rectifier circuit, and a filter circuit connected in sequence. The output terminal of the filter circuit is connected in series with an inductor L3 and then connected to the switch circuit.
所述开关电路包括场效应管M1，场效应管M1的G极与恒流芯片U2的门端连接，场效应管M1的D极接在电感L3和二极管D10之间，场效应管M1的S极串联电阻R15接地。The switch circuit includes a field effect transistor M1. The G pole of the field effect transistor M1 is connected to the gate end of the constant current chip U2. The D pole of the field effect transistor M1 is connected between the inductor L3 and the diode D10. The S pole of the field effect transistor M1 is connected to the gate terminal of the constant current chip U2. The series resistor R15 is connected to ground.
所述钳位电阻RVOP与恒流芯片U2的触发端之间分别通过电阻R16与二极管D10连接以及电阻R17接地。The clamping resistor RVOP and the trigger end of the constant current chip U2 are respectively connected to the diode D10 through a resistor R16 and connected to the ground through a resistor R17.
所述恒流芯片U2的型号为SN3948。The model of the constant current chip U2 is SN3948.
恒流芯片U2的GATE端接场效应管M1的G极，场效应管M1的S极与恒流芯片U2的CS端连接，并通过电阻R15接地，恒流芯片U2的TOFF端串联电阻R14接地，场效应管M1的D极分别接电感L3的一端和二极管D10的阳极，电感L3的另一端则与整流桥DG的输出端连接，整流桥DG的任意一个输入端串联保险丝FUS2，在整流桥DG的输出端之间并联电解电容C12，恒流芯片U2的VCC端通过电阻R13与电感的L3的另一端连接，并并联电容C13接地，二极管D10的阴极与LED灯的正输入端连接，且依次并联有接地的电解电容C14、接地的串联连接的电阻R16和电阻R17，恒流芯片U2的OVP端串联钳位电阻RVOP后接AC恒流源的输出端，恒流芯片U2的FB端直接接LED灯的负极，LED灯的负极与整流桥DG之间串联有电阻R18。在AC恒流源无输出时，则由DC恒流源输出供电。The GATE terminal of the constant current chip U2 is connected to the G terminal of the field effect transistor M1. The S terminal of the field effect transistor M1 is connected to the CS terminal of the constant current chip U2 and is grounded through the resistor R15. The TOFF terminal of the constant current chip U2 is connected in series with the resistor R14 to the ground. , the D pole of the field effect transistor M1 is connected to one end of the inductor L3 and the anode of the diode D10 respectively. The other end of the inductor L3 is connected to the output end of the rectifier bridge DG. Any input end of the rectifier bridge DG is connected in series with the fuse FUS2. The electrolytic capacitor C12 is connected in parallel between the output terminals of DG, the VCC terminal of the constant current chip U2 is connected to the other terminal of the inductor L3 through the resistor R13, and the parallel capacitor C13 is connected to ground, the cathode of the diode D10 is connected to the positive input terminal of the LED lamp, and The grounded electrolytic capacitor C14, the grounded series-connected resistor R16 and the resistor R17 are connected in parallel in sequence. The OVP terminal of the constant current chip U2 is connected in series with the clamping resistor RVOP and then connected to the output terminal of the AC constant current source. The FB terminal of the constant current chip U2 is directly connected. Connect the negative electrode of the LED lamp. There is a resistor R18 in series between the negative electrode of the LED lamp and the rectifier bridge DG. When the AC constant current source has no output, the DC constant current source output supplies power.
所述AC恒流源包括恒流芯片U1以及交直流转换电路。所述恒流芯片U1的型号为RED2401。The AC constant current source includes a constant current chip U1 and an AC-DC conversion circuit. The model of the constant current chip U1 is RED2401.
220AC输入端，一路依次串联保险丝FUS1、电感L1与构成整流桥的二极管D1、D2、D3和D4的输入端连接，在电感L1的两端分别并联电容C1和电容C2，220AC输入端的另一路则分别通过电容C11后接地以及电容C4后接COM端，整流桥的输出端之间并联电解电容C9，整流桥的正输出端则分别接三极管Q1的集电极以及电阻R7，三极管Q1的基极串联电阻R1后接变压器T1的第一次级绕组的一端，三极管Q1的发射极则分别与变压器T1的第二主绕组的一端以及变压器T1的第一次级绕组的另一端连接，变压器的第二主绕组的一端与电感L2连接，变压器T1的第一次级绕组的另一端与三极管Q2的集电极连接，电感L2与边沿器T2的第一主绕组的一端连接，三极管Q2的基极串联电阻R2接第二次级绕组的一端，三极管Q2的发射极接第二次级绕组的另一端，其中三极管Q1的发射极与集电极之间并联二极管D5，三极管Q2的发射极与集电极之间依次并联电容C8和二极管D6，变压器T2的第二次级绕组的另一端则依次串联电阻R3和电阻R4与COM端连接，且与220AC输入端之间设有电容C3，变压器T1的第一主绕组分别与恒流芯片U1的TX1端和TX2端连接，恒流芯片U1的GS端则与变压器T2的第一主绕组的另一端连接，且分别通过电阻R6和电阻R5接COM端，恒流芯片U1的VFB端则串联电阻R10后与电阻R8连接，并依次通过电阻R12和电容C6接COM端，恒流芯片U1的VDD端串联电阻R9后与电阻R8连接，并依次通过电阻R11和电容C5接COM端，电阻R8与电阻R10之间并联电容C7接COM端，电阻R8与电阻R7串联连接，电感L2与电阻R7和电阻R8之间并联二极管D7。变压器T2的第一次级绕组则与二极管D8的阳极连接，变压器T2的第二次级绕组则与二极管D9的阳极连接，二极管D8和二极管D9的阴极则与钳位电阻RVOP连接，变压器T2的第一次级绕组和第二次级绕组的另一端并在一起接LED灯的负极，且二极管D8的阴极与LED灯的负极之间依次设有电解电容C10和电阻R12后，二极管D8的阴极串联二极管D11后与LED灯的正极连接，由AC恒流源提供供电。At the 220AC input terminal, the fuse FUS1 and the inductor L1 are connected in series to the input terminals of the diodes D1, D2, D3 and D4 that form the rectifier bridge. Capacitors C1 and C2 are connected in parallel at both ends of the inductor L1. The other input terminal of the 220AC is connected in series. The capacitor C11 is connected to the ground and the capacitor C4 is connected to the COM terminal respectively. The output terminals of the rectifier bridge are connected in parallel with the electrolytic capacitor C9. The positive output terminal of the rectifier bridge is connected to the collector of the transistor Q1 and the resistor R7 respectively. The base of the transistor Q1 is connected in series. The resistor R1 is connected to one end of the first secondary winding of the transformer T1, and the emitter of the transistor Q1 is connected to one end of the second main winding of the transformer T1 and the other end of the first secondary winding of the transformer T1 respectively. One end of the main winding is connected to the inductor L2, the other end of the first secondary winding of the transformer T1 is connected to the collector of the transistor Q2, the inductor L2 is connected to one end of the first main winding of the edge device T2, and the base of the transistor Q2 is connected with a series resistor. R2 is connected to one end of the second secondary winding, and the emitter of transistor Q2 is connected to the other end of the second secondary winding. The emitter and collector of transistor Q1 are connected in parallel with diode D5, and the emitter and collector of transistor Q2 are connected in parallel. Capacitor C8 and diode D6 are connected in parallel in sequence. The other end of the second secondary winding of transformer T2 is connected to the COM terminal in series with resistor R3 and resistor R4. Capacitor C3 is set between the input terminal of 220AC and the first primary winding of transformer T1. The windings are connected to the TX1 end and TX2 end of the constant current chip U1 respectively. The GS end of the constant current chip U1 is connected to the other end of the first main winding of the transformer T2, and is connected to the COM end through the resistor R6 and the resistor R5 respectively. The constant current The VFB end of chip U1 is connected in series with resistor R10 and then connected to resistor R8, and is connected to the COM end through resistor R12 and capacitor C6 in turn. The VDD end of constant current chip U1 is connected in series with resistor R9 and then connected to resistor R8, and is connected in turn through resistor R11 and capacitor C6. C5 is connected to the COM terminal, the capacitor C7 is connected in parallel between the resistor R8 and the resistor R10 to the COM terminal, the resistor R8 and the resistor R7 are connected in series, and the diode D7 is connected in parallel between the inductor L2 and the resistor R7 and resistor R8. The first secondary winding of transformer T2 is connected to the anode of diode D8, the second secondary winding of transformer T2 is connected to the anode of diode D9, the cathodes of diode D8 and diode D9 are connected to the clamping resistor RVOP, and the The other ends of the first secondary winding and the second secondary winding are connected together to the cathode of the LED lamp, and there is an electrolytic capacitor C10 and a resistor R12 between the cathode of the diode D8 and the cathode of the LED lamp. The diode D11 is connected in series and connected to the anode of the LED lamp, which is powered by an AC constant current source.
所述LED灯有若干串联的LED并联组成。The LED lamp is composed of several series-connected LEDs connected in parallel.
在两个二极管D8和二极管D9的阴极依次并联点解电容C10和电阻R12。The cathodes of the two diodes D8 and D9 are connected in parallel with the capacitor C10 and the resistor R12.
所述DC恒流源与所述LED灯集成为一体，及两者成一个整体，DC恒流源是设置在LED的同一块铝基板上，节省体积。The DC constant current source and the LED lamp are integrated into one body, and the two are integrated into a whole body. The DC constant current source is arranged on the same aluminum substrate of the LED to save volume.
AC恒流源独立外置其输出+、-，与LED光源连接采用接下端正对插连接。The AC constant current source has independent external outputs + and -, and is connected to the LED light source by plugging in the lower end.
实施例不应视为对本发明的限制，任何基于本发明的精神所作的改进，都应在本发明的保护范围之内。The examples should not be regarded as limiting the present invention, and any improvements based on the spirit of the present invention should be within the protection scope of the present invention.
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| JPH09294373A (en) * | 1996-04-25 | 1997-11-11 | Fuji Electric Co Ltd | Snubber circuit for isolated AC / DC converter |
| JP2013021756A (en) * | 2011-07-07 | 2013-01-31 | Canon Inc | Power supply device |
| KR101229265B1 (en) * | 2011-12-20 | 2013-02-04 | 국방과학연구소 | Integrated transformer and high step-up dc/dc converter using the same |
| CN103957651A (en) * | 2014-05-06 | 2014-07-30 | 复旦大学 | High-frequency HID electronic ballast with self-adaptation circuit and application thereof |
| CN207304996U (en) * | 2017-09-28 | 2018-05-01 | 周安平 | Alternating current and direct current automatic switchover LED light |
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|---|---|---|---|---|
| JPH09294373A (en) * | 1996-04-25 | 1997-11-11 | Fuji Electric Co Ltd | Snubber circuit for isolated AC / DC converter |
| JP2013021756A (en) * | 2011-07-07 | 2013-01-31 | Canon Inc | Power supply device |
| KR101229265B1 (en) * | 2011-12-20 | 2013-02-04 | 국방과학연구소 | Integrated transformer and high step-up dc/dc converter using the same |
| CN103957651A (en) * | 2014-05-06 | 2014-07-30 | 复旦大学 | High-frequency HID electronic ballast with self-adaptation circuit and application thereof |
| CN207304996U (en) * | 2017-09-28 | 2018-05-01 | 周安平 | Alternating current and direct current automatic switchover LED light |
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