CN109905941A - Unipolar Multimode Wide Range Input Voltage Electrolytic Capacitorless LED Driver - Google Patents

Unipolar Multimode Wide Range Input Voltage Electrolytic Capacitorless LED Driver Download PDF

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CN109905941A
CN109905941A CN201910170219.9A CN201910170219A CN109905941A CN 109905941 A CN109905941 A CN 109905941A CN 201910170219 A CN201910170219 A CN 201910170219A CN 109905941 A CN109905941 A CN 109905941A
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voltage
diode
capacitor
anode
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CN109905941B (en
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曾君
刘锋
刘俊峰
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South China University of Technology SCUT
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Abstract

本发明公开了一种单极式多模态宽范围输入电压无电解电容LED驱动器，包括交流电源、滤波电感、滤波电容、4个整流二极管、4个开关管、2个输入电容、2个升压二极管、升压电感、2个输出二极管、2个LED负载、输出电感、2个输出电容，其中2个开关管构成双向开关。当输入电压为220V时，双向开关断开，LED驱动器工作于半压输入模式，可以实现低的母线电压和高效率；当输入电压为110V时，双向开关导通，LED驱动器工作于全压输入模式，降低了桥式整流二极管和另外2个开关管的导通损耗，提高了系统在低输入电压情况下的效率。本发明具有高效率、可工作于宽范围电压输入、母线电压低、无电解电容等优点。

The invention discloses a unipolar multi-mode wide-range input voltage non-electrolytic capacitor LED driver, comprising an AC power supply, a filter inductor, a filter capacitor, 4 rectifier diodes, 4 switch tubes, 2 input capacitors, 2 Voltage diodes, boost inductors, 2 output diodes, 2 LED loads, output inductors, and 2 output capacitors, of which 2 switches constitute a bidirectional switch. When the input voltage is 220V, the bidirectional switch is turned off, and the LED driver works in half-voltage input mode, which can achieve low bus voltage and high efficiency; when the input voltage is 110V, the bidirectional switch is turned on, and the LED driver works in full-voltage input mode, reduces the conduction loss of the bridge rectifier diode and the other two switches, and improves the efficiency of the system under low input voltage conditions. The invention has the advantages of high efficiency, wide range of voltage input, low bus voltage, no electrolytic capacitor and the like.

Description

The multi-modal wide-range input voltage LED driver without electrolytic capacitors of acyclic type
Technical field
The present invention relates to the technical field of LED driving, refer in particular to a kind of multi-modal wide-range input voltage of acyclic type without Electrolytic capacitor LED driver.
Background technique
Traditional LED driver topology is made of two-level configuration: PFC (PFC) grade and half-bridge DC/DC transformation Device grade.Although the independence of two-level configuration simplifies design, control complexity and system cost are increase accordingly.Simultaneously as More control circuits and switching device are needed, it is relatively inefficient.It is thereby achieved that control circuit and switching device shared Acyclic type LED driver is widely used.Traditional monopole has efficient, high without bridge boost PFC LED driver The advantages that power factor, but due to working in DCM mode, cause busbar voltage excessively high, under normal conditions VBus>2Vin(VinIt is defeated Enter voltage magnitude).This not only proposes requirements at the higher level to the pressure resistance of bus capacitor, but also so that switching tube is born bigger voltage and answer Power.When input voltage virtual value is 220V, VBus600V or more can be reached.Therefore monopole is normal without bridge boost PFC LED driver For low input occasion, limit its scope of application.Although bridge-type boost PFC LED driver can effectively reduce bus Voltage, but it includes full-bridge rectification structures, and higher conduction loss can be caused in low input, and system effectiveness is low.
Summary of the invention
It is an object of the invention to overcome conventional LED driver that cannot take into account high input voltage and low input applied field The shortcomings that conjunction, proposes a kind of electroless electricity of multi-modal wide-range input voltage of the acyclic type for being operable with wide-range input voltage Hold LED driver, the busbar voltage of high efficiency and optimization may be implemented.
To achieve the above object, technical solution provided by the present invention are as follows: the multi-modal wide-range input voltage of acyclic type without Electrolytic capacitor LED driver, the LED driver include AC power source, filter inductance, filter capacitor, the first rectifier diode, Second rectifier diode, third rectifier diode, the 4th rectifier diode, first switch tube, second switch, the first input electricity Appearance, the second input capacitance, the first booster diode, the second booster diode, boost inductance, third switching tube, the 4th switching tube, First output diode, the second output diode, the first LED load, the second LED load, outputting inductance, the first output capacitance, Second output capacitance；One end of the AC power source and the anode of the first rectification diode, the cathode of the second rectification diode, filter One end of wave capacitor is connected, and the other end is connected with one end of filter inductance；The other end and third of the filter inductance rectify The drain electrode of the anode of diode, the cathode of the 4th rectifier diode, the other end of filter capacitor, first switch tube is connected；It is described The source electrode of first switch tube is connected with the source electrode of second switch, constitutes two-way switch；The drain electrode of the second switch and the The cathode of one input capacitance, the anode of the second input capacitance, one end of boost inductance are connected；The anode of first input capacitance It is connected with the anode of the cathode of the first rectifier diode, the cathode of third rectifier diode, the first booster diode；Described second The anode of the cathode of input capacitance and the second rectifier diode, the anode of the 4th rectifier diode, the second booster diode yin Extremely it is connected；The other end and the source electrode of third switching tube, the drain electrode of the 4th switching tube, the first output diode of the boost inductance Anode, the second LED load cathode be connected；The third switching tube drains and the cathode of the first booster diode, first The anode of output capacitance is connected；The anode of the source electrode of 4th switching tube and the second booster diode, the second output capacitance Cathode is connected；The cathode of first output diode is connected with the anode of the first LED load；The sun of second LED load Pole is connected with the cathode of the second output diode；Anode, the output of the cathode and the second output diode of first LED load One end of inductance is connected；The other end of the outputting inductance and the cathode of the first output capacitance, the positive phase of the second output capacitance Even.
The LED driver passes through the conducting of first switch tube and second switch in different input voltages With disconnection, different mode is worked in obtain high efficiency and low busbar voltage；When input voltage is in the range of 220-240Vrms When interior, first switch tube and second switch shutdown, which works in half pressure input pattern, to obtain low bus Voltage reduces the switch stress of device, and half presses the high input voltage in input pattern by the first input capacitance and the second input electricity Appearance is divided equally, and boost inductance works in critical conduction mode；When input voltage is in the range of 100-120Vrms, first Switching tube and second switch conducting, the LED driver work in total pressure input pattern, reduce diode current flow loss, mention High system effectiveness, in total pressure input pattern, because the voltage of the first input capacitance and the second input capacitance is non-negative, third Rectifier diode and the shutdown of the 4th rectifier diode, in the positive half period of input voltage, the voltage of the first input capacitance is equal to The voltage of input voltage, the second input capacitance remains zero, in the negative half-cycle of input voltage, the voltage of the second input capacitance Equal to input voltage, the voltage of the first input capacitance remains zero.
Compared with prior art, the present invention have the following advantages that with the utility model has the advantages that
1, in high input voltage, busbar voltage is reduced by shutdown first switch tube and second switch, is reduced The voltage stress of bus capacitor and switching device.
2, in low input, reduce rectifier diode by opening first switch tube and second switch and open Light pipe loss, improves system effectiveness.
3, no electrolytic capacitor, service life are long.
In short, the present invention can be realized according to the different operating of input voltage in different modes in high input voltage Low busbar voltage realizes high efficiency in low input, and structure is simple, and control flexibly, has a good application prospect, and is worth It promotes.
Detailed description of the invention
Fig. 1 is the multi-modal wide-range input voltage LED driver without electrolytic capacitors circuit diagram of acyclic type of the invention.
Fig. 2 a is the equivalent circuit diagram when present invention works in half pressure input pattern.
Fig. 2 b is the equivalent circuit diagram when present invention works in total pressure input pattern.
Specific embodiment
Below with reference to specific implementation case, the invention will be further described.
As shown in Figure 1, the multi-modal wide-range input voltage no electrolytic capacitor LED driving of acyclic type provided by the present embodiment Device, including AC power source Vin, filter inductance Lf, filter capacitor Cf, the first rectifier diode D1, the second rectifier diode D2, third Rectifier diode D3, the 4th rectifier diode D4, first switch tube S1, second switch S2, the first input capacitance C1, second input Capacitor C2, the first booster diode D5, the second booster diode D6, boost inductance Lb, third switching tube S3, the 4th switching tube S4、 First output diode D7, the second output diode D8, the first LED load LED1, the second LED load LED2, outputting inductance Lr, One output capacitance Cb1, the second output capacitance Cb2；The AC power source VinOne end with first rectification diode D1Anode, Two rectification diode D2Cathode, filter capacitor CfOne end be connected, the other end and filter inductance LfOne end be connected；It is described Filter inductance LfThe other end and third rectifier diode D3Anode, the 4th rectifier diode D4Cathode, filter capacitor Cf's The other end, first switch tube S1Drain electrode be connected；The first switch tube S1Source electrode and second switch S2Source electrode be connected, Constitute two-way switch；The second switch S2Drain electrode and the first input capacitance C1Cathode, the second input capacitance C2Just Pole, boost inductance LbOne end be connected；The first input capacitance C1Anode with the first rectifier diode D1Cathode, third Rectifier diode D3Cathode, the first booster diode D5Anode be connected；The second input capacitance C2Cathode and second whole Flow diode D2Anode, the 4th rectifier diode D4Anode, the second booster diode D6Cathode be connected；The boosting electricity Feel LbThe other end and third switching tube S3Source electrode, the 4th switching tube S4Drain electrode, the first output diode D7Anode, Two LED load LED2Cathode be connected；The third switching tube S3Drain electrode and the first booster diode D5Cathode, first defeated Capacitor C outb1Anode be connected；The 4th switching tube S4Source electrode and the second booster diode D6Anode, second output electricity Hold Cb2Cathode be connected；The first output diode D7Cathode and the first LED load LED1Anode be connected；Described second LED load LED2Anode and the second output diode D8Cathode be connected；The first LED load LED1Cathode and second Output diode D8Anode, outputting inductance LrOne end be connected；The outputting inductance LrThe other end and the first output capacitance Cb1 Cathode, the second output capacitance Cb2Anode be connected.
The working principle of the multi-modal wide-range input voltage LED driver without electrolytic capacitors of the above-mentioned acyclic type of the present embodiment Are as follows: as input voltage VinWhen in the range of 220-240Vrms, first switch tube S1With second switch S2It turns off, at this time institute The LED driver of proposition works in half pressure input pattern, and equivalent circuit is as shown in Figure 2 a.In half pressure input pattern, height input electricity Pressure is by the first input capacitance C1With the second input capacitance C2Respectively, low busbar voltage is realized.Furthermore boost inductance LrIt works in and faces Boundary's conduction mode, to realize high power factor.As input voltage VinWhen in the range of 100-120Vrms, first switch tube S1With second switch S2Conducting, LED driver work in total pressure input pattern.In total pressure input pattern, because of the first input Capacitor C1With the second input capacitance C2Voltage be non-negative, third rectifier diode D3With the 4th rectifier diode D4Shutdown, etc. It is as shown in Figure 2 b to imitate circuit.In the positive half period of input voltage, the first input capacitance C1Voltage be equal to input voltage, second Input capacitance C2Voltage remain zero；In the negative half-cycle of input voltage, the second input capacitance C2Voltage be equal to input electricity Pressure, the first input capacitance C1Voltage remain zero.Total pressure input pattern reduces the loss of diode and switching device, improves System effectiveness.Furthermore boost inductance LrDiscontinuous conduction mode is worked in, to ensure high power factor.
In conclusion the multi-modal wide-range input voltage LED driver without electrolytic capacitors of acyclic type of the invention, realize Optimize busbar voltage, effectively reduces the voltage stress of bus capacitor and switching device in the case of high input voltage, and reduce Loss of the system in low input, improves system effectiveness.In addition, LED driver of the invention realizes nothing Electrolytic capacitor effectively increases lifetime of system and reliability.
The examples of implementation of the above are only the preferred embodiments of the invention, and implementation model of the invention is not limited with this It encloses, therefore all shapes according to the present invention, changes made by principle, should all be included within the scope of protection of the present invention.

Claims (2)

1.单极式多模态宽范围输入电压无电解电容LED驱动器，其特征在于：所述LED驱动器包括交流电源、滤波电感、滤波电容、第一整流二极管、第二整流二极管、第三整流二极管、第四整流二极管、第一开关管、第二开关管、第一输入电容、第二输入电容、第一升压二极管、第二升压二极管、升压电感、第三开关管、第四开关管、第一输出二极管、第二输出二极管、第一LED负载、第二LED负载、输出电感、第一输出电容、第二输出电容；所述交流电源的一端与第一整流二级管的阳极、第二整流二级管的阴极、滤波电容的一端相连，其另一端与滤波电感的一端相连；所述滤波电感的另一端与第三整流二极管的阳极、第四整流二极管的阴极、滤波电容的另一端、第一开关管的漏极相连；所述第一开关管的源极与第二开关管的源极相连，构成双向开关；所述第二开关管的漏极与第一输入电容的负极、第二输入电容的正极、升压电感的一端相连；所述第一输入电容的正极与第一整流二极管的阴极、第三整流二极管的阴极、第一升压二极管的阳极相连；所述第二输入电容的负极与第二整流二极管的阳极、第四整流二极管的阳极、第二升压二极管的阴极相连；所述升压电感的另一端与第三开关管的源极、第四开关管的漏极、第一输出二极管的阳极、第二LED负载的阴极相连；所述第三开关管的漏极与第一升压二极管的阴极、第一输出电容的正极相连；所述第四开关管的源极与第二升压二极管的阳极、第二输出电容的负极相连；所述第一输出二极管的阴极与第一LED负载的阳极相连；所述第二LED负载的阳极与第二输出二极管的阴极相连；所述第一LED负载的阴极与第二输出二极管的阳极、输出电感的一端相连；所述输出电感的另一端与第一输出电容的负极、第二输出电容的正极相连。1. A unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitors, characterized in that: the LED driver includes an AC power supply, a filter inductor, a filter capacitor, a first rectifier diode, a second rectifier diode, and a third rectifier diode. , the fourth rectifier diode, the first switch tube, the second switch tube, the first input capacitor, the second input capacitor, the first boost diode, the second boost diode, the boost inductor, the third switch tube, the fourth switch tube, a first output diode, a second output diode, a first LED load, a second LED load, an output inductor, a first output capacitor, and a second output capacitor; one end of the AC power supply is connected to the anode of the first rectifier diode , The cathode of the second rectifier diode and one end of the filter capacitor are connected, and the other end is connected to one end of the filter inductor; the other end of the filter inductor is connected to the anode of the third rectifier diode, the cathode of the fourth rectifier diode, and the filter capacitor. The other end of the switch is connected to the drain of the first switch; the source of the first switch is connected to the source of the second switch to form a bidirectional switch; the drain of the second switch is connected to the first input capacitor The cathode of the second input capacitor, the anode of the second input capacitor, and one end of the boost inductor are connected; the anode of the first input capacitor is connected to the cathode of the first rectifier diode, the cathode of the third rectifier diode, and the anode of the first boost diode; so The cathode of the second input capacitor is connected to the anode of the second rectifier diode, the anode of the fourth rectifier diode, and the cathode of the second boost diode; the other end of the boost inductor is connected to the source of the third switch tube, the fourth The drain of the switch tube, the anode of the first output diode, and the cathode of the second LED load are connected; the drain of the third switch tube is connected to the cathode of the first boost diode and the anode of the first output capacitor; the The source of the four-switch tube is connected to the anode of the second boost diode and the cathode of the second output capacitor; the cathode of the first output diode is connected to the anode of the first LED load; the anode of the second LED load is connected to the first LED load. The cathodes of the two output diodes are connected; the cathode of the first LED load is connected to the anode of the second output diode and one end of the output inductor; the other end of the output inductor is connected to the cathode of the first output capacitor and the anode of the second output capacitor connected. 2.根据权利要求1所述的单极式多模态宽范围输入电压无电解电容LED驱动器，其特征在于：所述LED驱动器在不同的输入电压情况下，通过第一开关管和第二开关管的导通与断开，工作于不同的模态以获得高效率与低母线电压；当输入电压在220-240Vrms的范围内时，第一开关管和第二开关管关断，该LED驱动器工作于半压输入模式，以获得低的母线电压，减小器件的开关应力，半压输入模式中的高输入电压由第一输入电容和第二输入电容均分，并且升压电感工作于临界导通模式；当输入电压在100-120Vrms的范围内时，第一开关管和第二开关管导通，该LED驱动器工作于全压输入模式，减小了二极管导通损耗，提高系统效率，在全压输入模式中，因为第一输入电容和第二输入电容的电压是非负的，第三整流二极管和第四整流二极管关断，在输入电压的正半周期中，第一输入电容的电压等于输入电压，第二输入电容的电压保持为零，在输入电压的负半周期中，第二输入电容的电压等于输入电压，第一输入电容的电压保持为零。2. The unipolar multi-mode wide-range input voltage LED driver without electrolytic capacitors according to claim 1, characterized in that: the LED driver passes the first switch tube and the second switch under different input voltage conditions. The conduction and disconnection of the tube work in different modes to obtain high efficiency and low bus voltage; when the input voltage is in the range of 220-240Vrms, the first switch tube and the second switch tube are turned off, and the LED driver Working in half-voltage input mode to obtain low bus voltage and reduce switching stress of the device, the high input voltage in half-voltage input mode is equally divided by the first input capacitor and the second input capacitor, and the boost inductor works at the critical Conduction mode; when the input voltage is in the range of 100-120Vrms, the first switch tube and the second switch tube are turned on, the LED driver works in full voltage input mode, which reduces the conduction loss of the diode and improves the system efficiency. In the full voltage input mode, since the voltages of the first input capacitor and the second input capacitor are non-negative, the third rectifier diode and the fourth rectifier diode are turned off, and during the positive half cycle of the input voltage, the voltage of the first input capacitor equal to the input voltage, the voltage of the second input capacitor remains zero, and in the negative half cycle of the input voltage, the voltage of the second input capacitor is equal to the input voltage, and the voltage of the first input capacitor remains zero.
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