CN108012385B - A non-isolated multi-channel current-sharing full-bridge LED drive circuit - Google Patents
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Abstract
本发明涉及一种非隔离多路均流全桥LED驱动电路。包括全桥恒流网络、均流网络和LED灯负载电路。所述全桥恒流网络由全桥开关网络和谐振网络组成，该全桥恒流网络具有恒流特性，所述均流网络通过电容均流实现4路LED灯均流工作。本发明所提出的恒流和均流电路，可为4路相同或不同个数的LED灯负载提供恒流和均流输出；具有拓扑结构简单、元件数目少、恒流和均流特性好和易于实现等特点。
The invention relates to a non-isolated multi-channel current-sharing full-bridge LED driving circuit. Including full bridge constant current network, current sharing network and LED lamp load circuit. The full-bridge constant-current network is composed of a full-bridge switch network and a resonant network. The full-bridge constant-current network has a constant-current characteristic, and the current-balancing network implements current-balancing work of four LED lamps through capacitive current-balancing. The constant current and current equalization circuit proposed by the present invention can provide constant current and current equalization output for 4 LED lamp loads with the same or different numbers; it has simple topology, less number of components, good constant current and current equalization characteristics and Ease of implementation and other features.
Description
技术领域technical field
本发明涉及一种非隔离多路均流全桥LED驱动电路。The invention relates to a non-isolated multi-channel current-sharing full-bridge LED driving circuit.
背景技术Background technique
LED作为一种新型的照明光源具有寿命长、节能环保等优点逐步受到人们的青睐，成为了照明领域的关注焦点。LED伏安特性符合指数关系，即电压的微小变化会造成电流的显著变化，而且导通压降受温度影响很大，因此LED采用恒流驱动已逐渐形成共识。LED灯的亮度、光通量和发光效率等光度学性能与LED驱动电流直接相关，高效可靠的LED驱动电源是LED照明快速发展的关键。As a new type of lighting source, LED has the advantages of long life, energy saving and environmental protection, and is gradually favored by people, and has become the focus of attention in the lighting field. The volt-ampere characteristic of LED conforms to the exponential relationship, that is, a small change in voltage will cause a significant change in current, and the conduction voltage drop is greatly affected by temperature. Therefore, a consensus has gradually been formed on the use of constant current drive for LEDs. The photometric properties of LED lamps such as brightness, luminous flux and luminous efficiency are directly related to the LED driving current. Efficient and reliable LED driving power is the key to the rapid development of LED lighting.
为满足亮度均匀要求，需保证流过每只LED的电流相等。最简单的方法是将多个LED灯串联连接，但过多的LED串联会使驱动电压过高、可靠性降低。实际应用中，大功率LED照明均需采用LED串并联相结合的方式连接，当多个LED支路并联于同一电压源时，由于导通电压存在差异，每个LED支路中的电流并不完全相等，电流大的支路的LED灯易发生光衰、老化，降低了LED灯的寿命和可靠性。为保证LED输出达到亮度、色度－致性等要求，需要采用均流措施才能保证各串LED的正向电流相等。In order to meet the requirement of uniform brightness, it is necessary to ensure that the current flowing through each LED is equal. The easiest way is to connect multiple LED lights in series, but too many LEDs in series will make the driving voltage too high and the reliability will be reduced. In practical applications, high-power LED lighting needs to be connected in a series-parallel combination of LEDs. When multiple LED branches are connected in parallel to the same voltage source, due to the difference in conduction voltage, the current in each LED branch does not vary. It is completely equal, and the LED lamp of the branch circuit with large current is prone to light decay and aging, which reduces the life and reliability of the LED lamp. In order to ensure that the LED output meets the requirements of brightness and chromaticity-consistency, it is necessary to adopt current equalization measures to ensure that the forward current of each string of LEDs is equal.
发明内容Contents of the invention
本发明的目的在于提供一种非隔离多路均流全桥LED驱动电路，可为4路相同或不同个数的LED灯负载提供恒流和均流输出；具有拓扑结构简单、元件数目少、恒流和均流特性好和易于实现等特点。The purpose of the present invention is to provide a non-isolated multi-channel current-sharing full-bridge LED drive circuit, which can provide constant current and current-sharing output for 4 LED lamp loads with the same or different numbers; it has simple topology, small number of components, The characteristics of constant current and current sharing are good and easy to realize.
为实现上述目的，本发明的技术方案是：一种非隔离多路均流全桥LED驱动电路，包括全桥恒流网络、均流网络和LED灯负载电路，所述全桥恒流网络由全桥开关网络和谐振网络组成；所述全桥开关网络包括第1至第4开关管，所述谐振网络包括第1电感、第2电感、谐振电容，所述均流网络包括第1至第3均流电容、第1至第4整流二极管，所述LED灯负载电路包括4路LED灯负载；第1开关管的漏极与电源正极、第3均流电容的一端、第3开关管的漏极连接，第1开关管的源极与第2开关管的漏极、第1电感的一端连接，第2开关管的源极与电源负极、谐振电容的一端、第4开关管的源极连接，第3开关管的源极与第2电感的一端、第4开关管的漏极连接，第1电感的另一端分别与第1至第2均流电容的一端连接，第1均流电容的另一端分别与第1整流二极管的阳极、第2整流二极管的阴极连接，第1整流二极管的阴极经第1路LED灯负载、第4路LED灯负载与第4整流二极管的阳极连接，第1路LED灯负载和第4路LED灯负载的连接点与第3均流电容的另一端连接，第2均流电容的另一端分别与第3整流二极管的阳极、第4整流二极管的阴极连接，第3整流二极管的阴极经第3路LED灯负载、第2路LED灯负载与第2整流二极管的阳极连接，第2路LED灯负载和第3路LED灯负载的连接点与谐振电容的另一端、第2电感的另一端连接。In order to achieve the above object, the technical solution of the present invention is: a non-isolated multi-channel current-sharing full-bridge LED drive circuit, including a full-bridge constant current network, a current-sharing network and an LED lamp load circuit, and the full-bridge constant current network consists of Composed of a full bridge switch network and a resonant network; the full bridge switch network includes the first to fourth switch tubes, the resonant network includes the first inductance, the second inductance, and the resonant capacitor, and the current sharing network includes the first to the fourth 3 current sharing capacitors, the first to fourth rectifier diodes, the LED lamp load circuit includes 4 LED lamp loads; the drain of the first switching tube and the positive pole of the power supply, one end of the third current sharing capacitor, and the third switching tube The drain is connected, the source of the first switching tube is connected to the drain of the second switching tube, one end of the first inductor, the source of the second switching tube is connected to the negative pole of the power supply, one end of the resonant capacitor, and the source of the fourth switching tube connected, the source of the third switching tube is connected to one end of the second inductor and the drain of the fourth switching tube, the other end of the first inductor is respectively connected to one end of the first to second current sharing capacitors, and the first current sharing capacitor The other end of the rectifier diode is respectively connected to the anode of the first rectifier diode and the cathode of the second rectifier diode. The cathode of the first rectifier diode is connected to the anode of the fourth rectifier diode through the load of the first LED lamp and the load of the fourth LED lamp. The connection point of the 1st LED lamp load and the 4th LED lamp load is connected to the other end of the third current sharing capacitor, and the other end of the second current sharing capacitor is respectively connected to the anode of the third rectifier diode and the cathode of the fourth rectifier diode , the cathode of the third rectifier diode is connected to the anode of the second rectifier diode through the third LED lamp load, the second LED lamp load, and the connection point of the second LED lamp load and the third LED lamp load and the resonant capacitor The other end is connected to the other end of the second inductor.
在本发明一实施例中，所述均流网络还包括第1至第4滤波电容，所述第1至第4滤波电容分别并联于第1至第4路LED灯负载的两端。In an embodiment of the present invention, the current sharing network further includes first to fourth filter capacitors, and the first to fourth filter capacitors are respectively connected in parallel to both ends of the first to fourth LED lamp loads.
在本发明一实施例中，所述LED灯负载电路的每一路LED灯负载均由串联连接的多个LED灯组成。In an embodiment of the present invention, each LED lamp load of the LED lamp load circuit is composed of a plurality of LED lamps connected in series.
在本发明一实施例中，所述每一路LED灯负载的LED灯个数相同或不同。In an embodiment of the present invention, the number of LED lamps loaded by each LED lamp is the same or different.
在本发明一实施例中，第1开关管和第2开关管、第3开关管和第4开关管均为互补工作，第1开关管和第4开关管同时通断，第2开关管和第3开关管同时通断。In one embodiment of the present invention, the first switch tube and the second switch tube, the third switch tube and the fourth switch tube are complementary, the first switch tube and the fourth switch tube are switched on and off at the same time, the second switch tube and the The third switch tube is turned on and off at the same time.
相较于现有技术，本发明具有以下有益效果：本发明电路可为4路相同或不同个数的LED灯负载提供恒流和均流输出；具有拓扑结构简单、元件数目少、恒流和均流特性好和易于实现等特点。Compared with the prior art, the present invention has the following beneficial effects: the circuit of the present invention can provide constant current and current equalization output for 4 LED lamp loads with the same or different numbers; it has simple topology, less number of components, constant current and It has the characteristics of good current sharing characteristics and easy realization.
附图说明Description of drawings
图1为本发明非隔离多路均流全桥LED驱动电路原理图。FIG. 1 is a schematic diagram of a non-isolated multi-channel current-sharing full-bridge LED drive circuit of the present invention.
图2为四路负载电阻分别为10欧、50欧、80欧和100欧时电流仿真波形。Figure 2 shows the current simulation waveforms when the four load resistances are 10 ohms, 50 ohms, 80 ohms and 100 ohms respectively.
图3为四路负载电阻都是10欧时电流仿真波形。Figure 3 is the simulation waveform of the current when the four load resistances are all 10 ohms.
图4为四路负载电阻都是80欧时电流仿真波形。Figure 4 is the current simulation waveform when the four load resistances are all 80 ohms.
具体实施方式Detailed ways
下面结合附图，对本发明的技术方案进行具体说明。The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
本发明的一种非隔离多路均流全桥LED驱动电路，包括全桥恒流网络、均流网络和LED灯负载电路，所述全桥恒流网络由全桥开关网络和谐振网络组成；所述全桥开关网络包括第1至第4开关管，所述谐振网络包括第1电感、第2电感、谐振电容，所述均流网络包括第1至第3均流电容、第1至第4整流二极管，所述LED灯负载电路包括4路LED灯负载；第1开关管的漏极与电源正极、第3均流电容的一端、第3开关管的漏极连接，第1开关管的源极与第2开关管的漏极、第1电感的一端连接，第2开关管的源极与电源负极、谐振电容的一端、第4开关管的源极连接，第3开关管的源极与第2电感的一端、第4开关管的漏极连接，第1电感的另一端分别与第1至第2均流电容的一端连接，第1均流电容的另一端分别与第1整流二极管的阳极、第2整流二极管的阴极连接，第1整流二极管的阴极经第1路LED灯负载、第4路LED灯负载与第4整流二极管的阳极连接，第1路LED灯负载和第4路LED灯负载的连接点与第3均流电容的另一端连接，第2均流电容的另一端分别与第3整流二极管的阳极、第4整流二极管的阴极连接，第3整流二极管的阴极经第3路LED灯负载、第2路LED灯负载与第2整流二极管的阳极连接，第2路LED灯负载和第3路LED灯负载的连接点与谐振电容的另一端、第2电感的另一端连接。所述均流网络还包括第1至第4滤波电容，所述第1至第4滤波电容分别并联于第1至第4路LED灯负载的两端。A non-isolated multi-channel current-sharing full-bridge LED drive circuit of the present invention includes a full-bridge constant current network, a current-sharing network and an LED lamp load circuit, and the full-bridge constant current network is composed of a full-bridge switch network and a resonant network; The full-bridge switch network includes first to fourth switch tubes, the resonant network includes a first inductance, a second inductance, and a resonant capacitor, and the current sharing network includes first to third current sharing capacitors, first to third 4 rectifier diodes, the LED lamp load circuit includes 4 LED lamp loads; the drain of the first switch tube is connected to the positive pole of the power supply, one end of the third current sharing capacitor, and the drain of the third switch tube, and the drain of the first switch tube The source is connected to the drain of the second switching tube and one end of the first inductor, the source of the second switching tube is connected to the negative pole of the power supply, one end of the resonant capacitor, and the source of the fourth switching tube, and the source of the third switching tube It is connected to one end of the second inductor and the drain of the fourth switch tube, the other end of the first inductor is respectively connected to one end of the first to second current sharing capacitors, and the other end of the first current sharing capacitor is respectively connected to the first rectifier diode The anode of the 2nd rectifier diode is connected to the cathode of the 2nd rectifier diode, the cathode of the 1st rectifier diode is connected to the anode of the 4th rectifier diode through the 1st LED lamp load, the 4th LED lamp load, and the 1st LED lamp load and the 4th LED lamp load The connection point of the LED lamp load is connected to the other end of the third current sharing capacitor, and the other end of the second current sharing capacitor is respectively connected to the anode of the third rectifier diode and the cathode of the fourth rectifier diode. The 3 LED light loads, the 2nd LED light load are connected to the anode of the 2nd rectifier diode, the connection point of the 2nd LED light load and the 3rd LED light load and the other end of the resonant capacitor, and the other end of the second inductance connect. The current sharing network further includes first to fourth filter capacitors, and the first to fourth filter capacitors are respectively connected in parallel to both ends of the first to fourth LED lamp loads.
所述LED灯负载电路的每一路LED灯负载均由串联连接的多个LED灯组成。所述每一路LED灯负载的LED灯个数相同或不同。Each LED lamp load of the LED lamp load circuit is composed of multiple LED lamps connected in series. The number of LED lamps loaded by each LED lamp is the same or different.
第1开关管和第2开关管、第3开关管和第4开关管均为互补工作，第1开关管和第4开关管同时通断，第2开关管和第3开关管同时通断。The first switch tube and the second switch tube, the third switch tube and the fourth switch tube all work complementary, the first switch tube and the fourth switch tube are turned on and off at the same time, and the second switch tube and the third switch tube are turned on and off at the same time.
以下为本发明的一具体实施例。The following is a specific embodiment of the present invention.
如图1所示，非隔离多路均流全桥LED驱动电路，由全桥开关网络、谐振网络、均流网络和LED负载电路组成。开关管Q1、Q2、Q3和Q4构成全桥开关网络，其中Q1和Q2、Q3和Q4均为互补工作，Q1和Q4同时通断，Q2和Q3同时通断。As shown in Figure 1, the non-isolated multi-channel current-sharing full-bridge LED drive circuit consists of a full-bridge switch network, a resonant network, a current-sharing network and an LED load circuit. The switching tubes Q1, Q2, Q3 and Q4 constitute a full-bridge switching network, in which Q1 and Q2, Q3 and Q4 are complementary, Q1 and Q4 are turned on and off at the same time, and Q2 and Q3 are turned on and off at the same time.
由整流滤波和LED灯串构成的四路LED负载，第一路LED负载由整流二极管D1、滤波电容C10和灯串LED11，…LED1n组成；第二路LED负载由整流二极管D2、滤波电容C20和灯串LED21，…LED2n组成；第三路LED负载由整流二极管D3、滤波电容C30和灯串LED31，…LED3n组成；第四路LED负载由整流二极管D4、滤波电容C40和灯串LED41，…LED4n组成。第一路和第三路LED负载在Q1、Q4同时导通时工作；第二路和第四路LED负载在Q2、Q3同时导通时工作。Four-way LED load composed of rectification filter and LED light string, the first LED load is composed of rectifier diode D1, filter capacitor C10 and light string LED11, ... LED1n; the second LED load is composed of rectifier diode D2, filter capacitor C20 and Light string LED21, ... LED2n; the third LED load is composed of rectifier diode D3, filter capacitor C30 and light string LED31, ... LED3n; the fourth LED load is composed of rectifier diode D4, filter capacitor C40 and light string LED41, ... LED4n composition. The first and third LED loads work when Q1 and Q4 are turned on at the same time; the second and fourth LED loads work when Q2 and Q3 are turned on at the same time.
由开关管Q1、Q2、Q3、Q4、第一谐振电感L1、第二谐振电感L2和谐振电容C4组成全桥恒流谐振网络，实现第二路LED负载和第三路LED负载总电流恒定，谐振网络输出通过第一均流电容C1、第二均流电容C2与四路LED负载相连，全桥恒流网络工作在恒流谐振频率下产生恒定的交流信号，通过第一均流电容C1、第二均流电容C2给四路LED负载供电。第一均流电容C1实现第一路和第二路LED负载的均流，第二均流电容C2实现第三路和第四路LED负载的均流，第三均流电容C3实现第一路和第四路LED负载的均流。由于四路LED电路是均流的，因此每一路LED灯串均为恒流工作；The full-bridge constant current resonant network is composed of switching tubes Q1, Q2, Q3, Q4, first resonant inductor L1, second resonant inductor L2 and resonant capacitor C4 to realize the constant total current of the second LED load and the third LED load. The output of the resonant network is connected to four LED loads through the first current sharing capacitor C1 and the second current sharing capacitor C2. The full bridge constant current network works at the constant current resonance frequency to generate a constant AC signal. The second current equalizing capacitor C2 supplies power to the four LED loads. The first current sharing capacitor C1 realizes the current sharing of the first and second LED loads, the second current sharing capacitor C2 realizes the current sharing of the third and fourth LED loads, and the third current sharing capacitor C3 realizes the first and the current sharing of the fourth LED load. Since the four-way LED circuits are current-sharing, each LED light string works at a constant current;
第二路和第三路LED负载一端分别与第一均流电容C1和第二均流电容C2相连，另一端两者相连后与谐振网络相连；第一路和第四路LED负载一端分别与第一均流电容C1和第二均流电容C2相连，另一端两者相连后通过第三均流电容C3与电路输入电源正极相连接，使得4路LED灯电流的总和是恒流网络输出电流的两倍,在同等输出功率下具有开关管电流应力小、输出纹波小等优点。One end of the second and third LED loads is respectively connected to the first current sharing capacitor C1 and the second current sharing capacitor C2, and the other end is connected to the resonant network after the two are connected; one end of the first and fourth LED loads is respectively connected to The first current-balancing capacitor C1 is connected to the second current-balancing capacitor C2, and the other end is connected to the positive pole of the circuit input power supply through the third current-balancing capacitor C3, so that the sum of the currents of the four LED lamps is the output current of the constant current network It has the advantages of small switch tube current stress and small output ripple under the same output power.
图2为四路负载电阻分别为10欧、50欧、80欧和100欧时电流波形。图3为四路负载电阻都是10欧时电流波形。图4为四路负载电阻都是80欧时电流波形。不同负载电阻分别表示不同个数的LED灯串。从图2至图4中可以看出，当四路负载电阻相同或不同时，稳态下流过四路LED灯串的电流基本相等，因此实现了四路LED灯串的恒流和均流工作。Figure 2 shows the current waveforms when the four load resistances are 10 ohms, 50 ohms, 80 ohms and 100 ohms respectively. Figure 3 shows the current waveforms when the four load resistors are all 10 ohms. Figure 4 shows the current waveforms when the four load resistances are all 80 ohms. Different load resistors respectively represent different numbers of LED light strings. It can be seen from Figure 2 to Figure 4 that when the four load resistances are the same or different, the currents flowing through the four LED light strings in the steady state are basically equal, so the constant current and current sharing work of the four LED light strings are realized .
以上是本发明的较佳实施例，凡依本发明技术方案所作的改变，所产生的功能作用未超出本发明技术方案的范围时，均属于本发明的保护范围。The above are the preferred embodiments of the present invention, and all changes made according to the technical solution of the present invention, when the functional effect produced does not exceed the scope of the technical solution of the present invention, all belong to the protection scope of the present invention.
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