CN102858064A - LED (light emitting diode) centralized drive power parallel system - Google Patents

LED (light emitting diode) centralized drive power parallel system Download PDF

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CN102858064A
CN102858064A CN2012103121329A CN201210312132A CN102858064A CN 102858064 A CN102858064 A CN 102858064A CN 2012103121329 A CN2012103121329 A CN 2012103121329A CN 201210312132 A CN201210312132 A CN 201210312132A CN 102858064 A CN102858064 A CN 102858064A
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unit
current
output
power
control
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CN2012103121329A
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Chinese (zh)
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顾永德
苏周
郝建强
徐兵
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茂硕电源科技股份有限公司
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Priority to CN2012103121329A priority Critical patent/CN102858064A/en
Publication of CN102858064A publication Critical patent/CN102858064A/en

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Abstract

The invention discloses an LED (light emitting diode) centralized drive power parallel system which comprises more than one independent power module, more than one LED drive power unit and a monitoring unit, wherein the AC (alternating current) mains supply is converted by the independent power module and converged by a parallel bus and output to each LED drive power unit; the LED drive power unit drives an LED lamp group; and the monitoring unit detects the input current of each LED drive power unit, averages the input current and outputs the average to each independent power module to control the work of each independent power module. The system disclosed by the invention adopts a centralized control system and scattered LED drive control mode, namely that the centralized control increases the system power by use of an AC/DC module N+1 parallel mode, and then the power is scattered to each LED drive to supply power. According to the invention, the duty cycle of the power is adjusted by directly adding current detection to the controlled double closed-loop system so as to realize automatic current equalization of the module; and compared with the traditional current equalizing technology, the system is simple and practical, and the current equalizing effect is good.

Description

—种LED集中驱动电源并机系统 - concentration kinds of LED driving power supply system and

技术领域 FIELD

[0001] 本发明公开一种LED驱动电源系统,特别是一种LED集中驱动电源并机系统。 [0001] The present invention discloses an LED driving power supply system, particularly to a LED drive power and focus system.

背景技术 Background technique

[0002] 随着LED照明技术的发展,LED在人们日常生活的应用越来越广泛,随之而来的,LED驱动电源也得到了很大的发展。 [0002] With the development of LED lighting technology, LED application in people's daily lives more and more widely, the attendant, LED driver power supply has also been a great development. LED路灯通常是采用集中供电的模式,一个电源箱集中通过母线对多组LED进行供电,然而在实际使用中,通常会产生,多组LED驱动模块的电流不均衡等缺点,从而造成LED驱动电源效率低、寿命短、成本高等问题。 LED lights typically centralized power supply mode, a power supply box centralized power a plurality of sets of LED through a bus bar, however, in actual use, typically produce a current plurality of sets of LED drive module unbalanced disadvantages, causing LED drive power low efficiency, short life and high cost.

发明内容 SUMMARY

[0003] 针对上述提到的现有技术中的LED驱动电源效率低、寿命短、成本高等问题,本发明提供一种新的LED集中驱动电源并机系统,其采用集中控制的N+1并机供电来提高系统功率,然后再将功率分散供给各个LED驱动来供电,从而降低成本,延长使用寿命。 [0003] The drive power is low efficiency, short life and high cost, the present invention provides a novel LED driving power and focus system that employs a centralized control N + 1 for the prior art mentioned above and the LED to improve the system power supply unit, and then dispersing and feeding power to each of the LED driving power supply, thereby reducing costs and prolong life.

[0004] 本发明解决其技术问题采用的技术方案是:一种LED集中驱动电源并机系统,该系统包括一个以上的独立电源模块、一个以上的LED驱动电源单元和监控单元,交流市电经独立电源模块转换后,经由并机汇流总线汇流后输出给各个LED驱动电源单元,LED驱动电源单元驱动LED灯组,监控单元检测各个LED驱动电源单元的输入电流,取平均值后输出给各个独立电源模块,控制各个独立电源模块工作。 [0004] The technical solution to solve the technical problems of the present invention is: an LED driving power and focus system, the system comprising one or more separate power supply module, one or more LED driving power supply unit and the monitoring unit, AC power via after independent power conversion modules, the bus and the machine via a bus after outputting drive power to the respective LED unit, the LED driving unit drives the power LED lamp set, to monitor each of the LED driving unit detects the input current of the power unit output to each individual after averaging power modules, controls the individual power modules work.

[0005] 本发明解决其技术问题采用的技术方案进一步还包括: [0005] solve the technical problems further aspect of the present invention further comprises:

所述的独立电源模块包括AC/DC功率变换单元、PWM控制单元、MCU控制单元、输出电流采样单元和电压电流双闭环控制单元,外接交流电经交直流转换后输入PWM控制单元,然后经PWM控制单元转换后,再输出给AC/DC功率变换单元转成直流电后,输出给并机汇流总线,输出电流采样单元采样DC输出单元的输出电流,输出采样信号给监控单元,监控单元输出控制信号给PWM控制单元,控制其工作,电压电流双闭环控制单元分别采样DC输出单元的输出电流和输出电压,经电流调整单元和电压调整单元调整后输出给PWM控制单元,控制其工作。 The power module includes a separate AC / DC power converting unit, a PWM control unit, the MCU control unit, the output current of the voltage sampling unit and current double closed loop control means, the control means external input PWM AC by the AC-DC conversion, and then by the PWM control after the unit conversion, and then output to the AC / DC power converting unit transfected into DC output to and machine side bus, the output current of the output current sampling unit DC output unit outputs a sampling signal to the monitoring unit, the monitoring unit outputs a control signal to the PWM control unit to control its operating voltage and current double closed loop control means are sampled output current and output voltage of the DC output unit, after the current and the voltage adjusting unit adjusting unit adjusts the output to the PWM control means to control its operation.

[0006] 所述的独立电源模块还包括保护继电器,AC/DC功率变换单元输出直流电经保护继电器传输给并机汇流总线,MCU控制单元控制保护继电器工作。 [0006] The independent power module further comprises a protective relay, AC / DC power converting unit via the DC output is transmitted to the protective relay and the bus bar unit, MCU control unit controls the protection relay operates.

[0007] 所述的AC/DC功率变换单元包括全桥变换单元和DC输出单元,PWM控制单元输出交流电经全桥变换单元进行交直流转换,然后再经过DC输出单元输出给并机汇流总线。 [0007] said AC / DC power converting unit includes a full-bridge DC conversion unit and an output unit, the output of the PWM control unit converts the alternating current full-bridge AC-DC converting means, and then output to the output unit via the DC bus and the bus machine.

[0008] 所述的电压电流双闭环控制单元包括电压外环控制环和电流内环控制环,AC/DC功率变换单元输出经电压采样电阻分压后输入电压外环控制环,与MCU控制单元输出的VADJ信号进行比较后,输出给电流内环控制环,AC/DC功率变换单元输出经电流采样电阻进行电流采样后输出给电流内环控制环,电流内环控制环输出控制PWM控制单元工作。 [0008] The voltage-current dual-loop control unit comprises a voltage control loop and outer inner current control loop, AC / DC loop power input voltage conversion unit outputs the voltage control loop sampling resistor divider, and the control unit MCU after the output signal VADJ, and outputs to the inner current control loop, AC / DC power conversion unit outputs a current sampling resistor to the output current is sampled inner current control loop, the control loop output current loop control unit operates the PWM control .

[0009] 所述的电压外环控制环采用运放U1D,采样电压信号和VADJ信号同时输入运放UlD的反相输入端,运放UlD的同相输入端通过电阻R15接地。 Outer voltage [0009] The control loop uses operational amplifier U1D, the sampling voltage signal and the input signal at the same VADJ inverting input of op-amp UlD, the inverting input terminal of op amp UlD same is grounded through a resistor R15. [0010] 所述的电流内环控制环采用运放U1B,采样电流信号和电压外环控制环输出信号同时输入运放UlB的反相输入端,运放UlB的同相输入端通过电阻R7接地。 Current inner [0010] The use of op amp U1B is the control loop, outer loop sampling current signal and a voltage control loop while the output signal of the inverting input of op amp input UlB, the inverting input of operational amplifier UlB same end is grounded through a resistor R7.

[0011] 所述的独立电源模块还包括均流控制环,AC/DC功率变换单元输出经电流采样电阻进行电流采样后输出给均流控制环,与监控单元输出的各个LED驱动电源单元的输入电流平均值进行比较,输出控制PWM控制单元工作。 Is output to the [0011] said power modules further comprises a separate current-control loop, AC / DC power conversion unit outputs a current sampling resistor current is sampled after each flow control loop, the input power to the respective LED unit output from the driver monitoring unit comparing the current average value, the output control unit operates the PWM control.

[0012] 所述的均流控制环采用运放U1C,采样电流信号输入运放UlC的反相输入端,监控单元输出的各个LED驱动电源单元的输入电流平均值输入运放UlC的同相输入端。 [0012] The flow control loops using the average of U1C operational amplifier, the input sample current signal inverting input terminal of op amp UlC, the individual monitoring unit outputs LED drive input current average value of the discharge power supply unit input op-inverting input of UlC .

[0013] 所述的运放UlC同相输入端和反相输入端之间连接有比较电阻R29。 [0013] The operational amplifier non-inverting input of UlC relatively resistor R29 between the terminal and the inverting input is connected.

[0014] 本发明的有益效果是:本发明采用集中控制系统+分散LED驱动控制模式,即集中控制利用AC/DC模块N+1并机来提高系统功率,然后再将功率分散供给各个LED驱动来供电。 [0014] Advantageous effects of the present invention are: the present invention uses centralized control system + LED driving control mode dispersion, i.e. the use of centralized control of AC / DC module unit and N + 1 to increase system power, then the power supplied to each LED driver dispersion powered. 本发明直接在控制的双闭环系统中增加电流检测来调节功率占空比使模块实现自动均流,与传统的均流技术相比,该方法简单实用,均流效果良好。 The present invention is directed to increase the current detection in dual loop control system, the duty cycle is adjusted so that the power module for automatic current, compared with the conventional streaming technology, this method is simple and practical, had good flow effect.

[0015] 下面将结合附图和具体实施方式对本发明做进一步说明。 [0015] The accompanying drawings and the following specific embodiments of the present invention will be further described.

附图说明 BRIEF DESCRIPTION

[0016] 图I为本发明系统方框图。 [0016] Figure I of the present invention is a system block diagram.

[0017] 图2为本发明模块单元方框图。 [0017] Figure 2 a block diagram of the module unit of the present invention.

[0018] 图3为本发明模块电路原理图。 [0018] Fig 3 block circuit diagram of the present invention.

[0019] 图4为本发明模块应用电路原理图。 [0019] Application Module FIG. 4 circuit diagram of the present invention.

[0020] 图5为本发明系统简化电路原理图。 [0020] FIG. 5 is a simplified schematic circuit diagram of the inventive system.

[0021] 图6为本发明应用电路原理图。 [0021] Fig 6 a schematic circuit diagram of the present invention applied.

[0022] 图7为本发明系统电路原理图。 [0022] FIG 7 schematic circuit diagram of the system of the present invention.

具体实施方式 Detailed ways

[0023] 本实施例为本发明优选实施方式,其他凡其原理和基本结构与本实施例相同或近似的,均在本发明保护范围之内。 [0023] Example embodiment of the present invention, the present preferred embodiment, where the other principle and basic structure of the present embodiment, the same or similar, are within the scope of the present invention.

[0024] 请参看附图I本发明主要包括一个以上的独立电源模块、一个以上的LED驱动电源单元和监控单元,一个以上的独立电源模块将外接交流市电转换成直流电后,经并机汇流总线汇流后输出给各个LED驱动电源单元,经LED驱动电源单元各驱动一组LED灯。 [0024] Referring to the drawings the present invention I include one or more separate power supply module, one or more LED driving power supply unit and the monitoring unit, one or more separate external power supply module converts the AC power into DC power, via the bus unit and after a bus drive power outputted to the respective LED unit, the LED driving power supply unit via a set of LED lights each driving. 请参看附图2和附图3,本发明中,独立的电源模块主要包括AC/DC功率变换单元、PWM控制单元、MCU控制单元(图中未画出)、输出电流采样单元、保护继电器、电压电流双闭环控制单元和均流控制单元,本实施例中,AC/DC功率变换单元主要包括全桥变换单元和DC输出单元,外接交流电经交直流转换后输入PWM控制单元,经PWM控制单元转换后,再输出给全桥变换单元进行交直流转换,然后再经过DC输出单元转成直流电后,经保护继电器输出给并机汇流总线,给LED驱动电源单元供电,输出电流采样单元采样DC输出单元的输出电流,输出采样信号给均流控制单元,均流控制单元输出控制信号给PWM控制单元,控制其工作,电压电流双闭环控制单元分别采样DC输出单元的输出电流和输出电压,经电流调整单元和电压调整单元调整后输出给PWM控制单元,控制其工作,MCU See Figures 2 and 3, the present invention, the power module includes a separate AC / DC power converting unit, the PWM control unit, the MCU control unit (not shown), output current sampling unit, protective relay, voltage and current dual-loop control unit and the current-control unit, in this embodiment, AC / DC power conversion unit includes an input PWM control unit after full bridge unit and a DC output unit, an external AC by the AC-DC converter, the PWM control unit after the conversion, and then output to the full bridge unit AC-DC conversion, and then after a DC output unit is converted into DC output to Parallel bus bar by the protective relay, to the LED driving power supply unit, the output current sampling unit DC output output current of the unit outputs a sampling signal to the current-control unit, current-control unit outputs a control signal to the PWM control unit that controls its operation, the voltage and current double output current and output voltage of the DC output unit of the closed-loop control unit are sampled by current and a voltage adjusting unit adjusting unit adjusts the output to the PWM control unit, control its operation, the MCU 制单元保护继电器工作。 Protective relay system work unit. 当母线出现短路时,系统检测到故障信号后立即断开所有独立电源模块的保护继电器,本实施例中,通过监控单元检测采样的电流值,当采样的电流值出现异常时,则判断为出现故障,通过RS-485接口通知有故障的独立电源模块,断开系统;当系统检测到某个模块出现故障,立即将该独立电源模块断开,这样不会影响系统的正常工作,保证了每个模块的安全性。 A short circuit occurs when the bus, the system detects a fault protection relay signal is switched off immediately all independent power modules, in this embodiment, the monitoring unit is detected by the current sampled value, when an abnormal current value of the sample occurs, it is determined that appears fault, fault independent power modules, disconnect the system via RS-485 interface notification; when the system detects that a module fails, the independent power supply module is disconnected immediately, this will not affect the normal operation of the system to ensure that every a security module. 该并联技术只是将实际控制环路稍微加以修改,即可满足系统的均流控制。 The parallel technology actual control loop just slightly be modified to meet the system average flow control. 请结合参看附图3至附图7,本实施例中,以一组独立电源模块为例,对本发明的电路原理进行具体说明,具体实施时,可根据实际需要设置N路独立电源模块,本发明中,独立的系统模块包括AC/DC高频开关电源(主要包括AC/DC功率变换单元和PWM控制单元,此两个单元可采用常规的高频开关电源结构)、输出电流采样电阻R1、采样电阻R2、保护继电器Kl以及电压电流的控制闭环,其中的电阻R5、电阻R3串联连接为电源模块输出电压的分压电阻,VADJ信号为输出电压的给定值(给定值VADJ可根据实际的输出电压确定,通常选取VADJ=5V),本实施例中,VADJ信号由MCU控制单元输出,运放UlD为电压控制环核心元件,电压外环控制环主要运放U1D、电阻R4、电阻R15、电容C3、电容C4和电阻Rl2组成(请参看附图3),VADJ信号和电阻R5、电阻R3的分压信号分别输入运放UlD的反相输入端,运放U Please reference to the drawings in conjunction with the accompanying drawings 3 to 7, in this embodiment, a set of independent power supply module as an example of the present embodiment, the circuit of the principles of the present invention will be described in detail, the specific embodiment, N may be set according to actual needs independent power supply module, the present invention, the system module comprises a separate AC / DC power supply high-frequency switching (including AC / DC power converting unit and a PWM control unit, the two units may be employed conventional frequency switching power supply configuration), the output current sampling resistor R1, sampling resistor R2, the protection control relay Kl and a voltage current loop, wherein the resistor R5, a resistor R3 is connected in series to the voltage dividing resistor the output voltage of the power supply module, VADJ signal for a given value of the output voltage (setpoint VADJ may be based on the actual the output voltage is determined, typically selected VADJ = 5V), the present embodiment, the control unit MCU VADJ signal output by the op-amp UlD voltage control loop core element, a voltage control loop outer main amplifier U1D, resistor R4, resistor R15 , capacitor C3, capacitor C4 and resistor Rl2 composition (see reference 3), VADJ signal and resistor R5, a signal dividing resistor R3 are respectively input to the inverting input terminal of op amp UlD, operational amplifier U lD的同相输入端通过电阻R15接地,电压控制环输出信号送给输出运放U1B,运放UlB为电流控制环核心元件,电流内环控制环主要包括运放U1B、电容Cl、电容C2、电阻R6、电阻R10、电阻Rll和电阻R7组成(请参看附图3),作为电流给定参考值,电压控制环输出信号输出给电流控制环UlB ;采样电阻Rl和采样电阻R2并联连接,通过采样电阻Rl和采样电阻R2采样模块的输出电流,并将米样信号输入给运放UlB的反相输入端和运放UlC的反相输入端,运放UlB的同相输入端通过电阻R7接地,运放UlC的同相输入端连接I_AV信号,运放U1C、电阻R8、电阻R9和电阻R29组成为均流控制环,电阻R29为单个模块输出电流与N个并机模块输出电流的平均值I_AV之间的比较电阻;I_AV信号为N个并机模块的平均电流值,各个独立电源模块的采样电流输入监控单元,经监控单元计算出平均电流值后,输出I_AV信 LD-inverting input terminal of the same is grounded through a resistor R15, the voltage control loop output signal to the output amplifier U1B is, the current control amplifier UlB loop core element, the inner current control loop including op-amp U1B is, capacitor Cl, capacitor C2, a resistor R6, resistor R10, resistor R7 and resistor Rll (see FIG. 3), given as a current reference value, the voltage control loop output signal to the current control loop U1B; resistor Rl and a resistor R2 is connected in parallel sampled samples, by the sampling sampling resistor Rl and resistor R2 sampling module output current, and rice-like signal is input to the inverting input of operational amplifier UlB and the inverting input of op-amp UlC, the operational amplifier inverting input terminal via a resistor R7 to ground UlB, transport inverting input terminal is connected to the discharge UlC I_AV signal of U1C operational amplifier, a resistor R8, resistor R29 and resistor R9 are composed of a flow control loop, the resistor R29 between the output current of a single module with the N and the average value of the output current machine module I_AV comparison of resistance; I_AV signal and the average current value of N unit modules, each sampling current input monitoring unit independently of the power module, the average current value calculated by the monitoring unit, the output channel I_AV ,本实施例中,并机模块(即独立电源模块)输出电流值送到监控单元做平均计算,电流平均值与每个并机模块的输出电流进行比较,如果二者比较电阻值之间的压降为零,说明该模块达到了均流,当二者的比较值电阻上的压降不为零时,说明该模块电流有偏差,将二者的差值叠加到电流输出端,来通过该模块的PWM控制单元调整功率占空比去改变输出电流,使其达到均流。 , In this embodiment, and the machine module (i.e., separate the power module) to the output current value of the monitoring unit averaging the calculated current average value is compared with the current output of each machine module and, if both the comparison between the resistance value drop to zero, indicating that the flow modules are reached, when the voltage drop across the resistance of both the comparison value is not zero, indicating that the current block deviation, the difference between the two superimposed to the current output terminal to by PWM control unit adjusts the power of the module to change the duty ratio of the output current to reach the current sharing. 运放UlC的同相输入端和反相输入端之间连接有电阻R29,电阻R29为模块输出电流与总电流平均值比较电阻,运放UlC为电流比较运算放大器,将电流比较后的值叠加到电流控制输出端,去调节占空比。 UlC operational amplifier non-inverting input terminal between the resistor R29 and the inverting input terminal is connected to the resistor R29 module output current and the total current resistance comparing means, a current comparator op amp UlC operational amplifier, comparing the current value of the superimposed a current control output, to adjust the duty cycle. 本发明中的控制回路采用双闭环控制,其内环为输出电流控制环,夕卜环为输出电压控制环,电压的给定值为实际输出电压给定参考值,且电压的输出控制为电流的参考给定值,这样整个电源系统通过双闭环控制保证了恒定的输出电压和电流。 In the present invention, the control circuit adopts the double-loop control, the inner control loop for the output current, output voltage Xi Bu loop control loop, the actual value of the voltage for a given output voltage given reference value, and the output current control voltage given reference value, so that the entire power supply system ensures constant output voltage and current double closed loop control.

[0025] 本发明的工作原理如下: [0025] The working principle of the present invention is as follows:

双闭环工作原理:单模块输出电压通过采样分压电阻R5、电阻R3的反馈值与电压给定值VADJ比较后通过PI (由电阻R12、电容C3、电容C4组成)控制环来控制输出电压,经过调整后,作为电流内环的给定值与输出电流取样值比较后通过PI (由电阻R6、电容Cl、电容C2组成)控制环来控制输出电流,经过调整后,去调整PWM控制单元,来驱动全桥变换,这样电压电流双闭环保证了恒定的输出电压和电流。 Double loop works: single module output voltage by sampling the voltage dividing resistors R5, a feedback value of the voltage of the resistor R3 for a given value VADJ comparison PI (a resistor R12, capacitor C3, capacitor C4 composition) control loop to control the output voltage, after the adjustment, the inner ring after comparing the current setpoint value and the output current sampling value by PI (a resistor R6, capacitor Cl, capacitor C2) control loop to control the output current, after adjustment, to adjust a PWM control unit, to drive the full bridge, so that the voltage-current double loop ensures constant output voltage and current.

[0026] 均流环工作原理:单模块输出电流通过采样电阻Rl将电流值变为电压值与N个并机模块输出电流的平均值I_AV进行比较,其中比较电阻为电阻R29,当输出电流值与平均值I_AV相等时,比较电阻R29两端的电压值为O,证明该模块均流;当输出电流值与平均值I_AV不相等时,比较电阻R29两端的电压值为不为O,证明该模块不均流,与平均值有一定的误差值,该误差输出直接叠加到电流输出环去调整PWM控制单元,通过PWM控制来调整输出电流的值达到均流的目的。 [0026] The current-loop principle: single module output current value by a current sampling resistor Rl becomes the voltage value of N and the average value of the output current machine module I_AV compared, wherein comparing the resistance is the resistance R29, when the output current value I_AV equal the average, comparing the voltage across resistor R29 is O, show that the flow modules; when the output current value is not equal to the average I_AV voltage comparator across resistor R29 is not is O, prove that the module uneven flow, the average value has a certain error, the error output is added directly to the PWM current output loop to adjust the control unit to adjust the value of the output current by PWM control to achieve the purpose of current sharing.

[0027] 本发明中采用的N+1冗余并机模块(本实施例中,采用N+1路独立电源模块,工作时,只有N个独立电源模块进行工作,余留下来的一个作为备份,当某个独立电源模块有故障时不会影响系统的正常工作)主要针对目前路灯集中控制而设计的,各个并机模块输出电流值采样后送到监控单元做平均计算,计算值与每个并机模块的输出电流进行比较匕如IOl与I_AV),如果二者比较电阻R29之间的压降为零,说明该模块达到了均流,当二者的比较电阻R29上的电压不为零时,说明该模块电流有偏差,将二者的差值叠加到电流输出端,来调整PWM控制电路去改变输出电流值达到均流的作用。 [0027] The present invention is employed in the N + 1 redundancy and modules (in this embodiment, using N + 1 independent power supply module, in operation, only N independent power modules work, you stay as a backup after independent power when a module failure will not affect the normal operation of the system) for the current street is mainly designed for centralized control, each machine module and an output current value to the monitoring unit sampling averaging the calculated results with each and the output current of the machine module dagger as compared with I_AV IOl), if the pressure drop between the two resistors R29 comparator is zero, indicating that the flow modules are reached, when the voltage across resistor R29 comparing both not zero when, indicating that the current block deviation, the difference between the two superimposed to the current output terminal, adjusting the PWM control circuit to change an output current value to the role of both streams. 该系统理论上可以并机N个独立电源模块,给负载集中供电。 The machine and system can theoretically N independent power modules, centralized power supply to the load. [0028] 本发明采用集中控制系统+分散LED驱动控制模式,即集中控制利用AC/DC模块N+1并机来提高系统功率,然后再将功率分散供给各个LED驱动来供电。 [0028] The present invention uses a centralized control system + LED driving control mode dispersion, i.e. the use of centralized control of AC / DC module unit and N + 1 to increase system power, then the power supplied to each LED driver dispersion powered. 本发明直接在控制的双闭环系统中增加电流检测来调节功率占空比使模块实现自动均流,与传统的均流技术相比,该方法简单实用,均流效果良好。 The present invention is directed to increase the current detection in dual loop control system, the duty cycle is adjusted so that the power module for automatic current, compared with the conventional streaming technology, this method is simple and practical, had good flow effect.

Claims (10)

1. 一种LED集中驱动电源并机系统,其特征是:所述的系统包括一个以上的独立电源模块、一个以上的LED驱动电源单元和监控单元,交流市电经独立电源模块转换后,经由并机汇流总线汇流后输出给各个LED驱动电源单元,LED驱动电源单元驱动LED灯组,监控单元检测各个LED驱动电源单元的输入电流,取平均值后输出给各个独立电源模块,控制各个独立电源模块工作。 An LED drive power and centralized system, characterized in that: said system comprises one or more separate power supply module, one or more LED driving power supply unit and the monitoring unit, after AC mains independent power conversion modules, via after the machine bus and a bus is output to the LED driving power supply of each unit, the LED driving unit drives the power LED lamp set, to monitor each of the LED driving unit detects an input current of the power supply unit, the power output to the individual modules after averaging the individual power control module work.
2.根据权利要求I所述的LED集中驱动电源并机系统,其特征是:所述的独立电源模块包括AC/DC功率变换单元、PWM控制单元、MCU控制单元、输出电流采样单元和电压电流双闭环控制单元,外接交流电经交直流转换后输入PWM控制单元,然后经PWM控制单元转换后,再输出给AC/DC功率变换单元转成直流电后,输出给并机汇流总线,输出电流采样单元采样DC输出单元的输出电流,输出采样信号给监控单元,监控单元输出控制信号给PWM控制单元,控制其工作,电压电流双闭环控制单元分别采样DC输出单元的输出电流和输出电压,经电流调整单元和电压调整单元调整后输出给PWM控制单元,控制其工作。 According to claim I of the LED driving power supply and centralized system, wherein: said power module includes a separate AC / DC power converting unit, the PWM control unit, the MCU control unit, the output current and voltage and current sampling unit dual-loop control unit, the external AC power by the DC-AC input PWM control unit, and then after the PWM control unit converter, and then output to the AC / DC power converting unit, converted into DC output to and machine side bus, the output current sampling unit sampling the DC output unit, output current, output sampling signal to the monitoring unit, the monitoring unit outputs a control signal to the PWM control unit that controls its operation, the voltage current double closed loop control means are sampled output current and output voltage of the DC output unit, the current adjustment after the unit and the adjusting unit adjusts the output voltage to the PWM control means to control its operation.
3.根据权利要求2所述的LED集中驱动电源并机系统,其特征是:所述的独立电源模块还包括保护继电器,AC/DC功率变换单元输出直流电经保护继电器传输给并机汇流总线,MCU控制单元控制保护继电器工作。 3. The LED driving power supply of claim 2 and centralized system, as claimed in claim wherein: said power module further comprises a separate protective relay, AC / DC power converting unit via the DC output unit and transmitted to the protective relay bus bar, The control unit MCU controls the protection relay operates.
4.根据权利要求2所述的LED集中驱动电源并机系统,其特征是:所述的AC/DC功率变换单元包括全桥变换单元和DC输出单元,PWM控制单元输出交流电经全桥变换单元进行交直流转换,然后再经过DC输出单元输出给并机汇流总线。 The LED driving power supply of claim 2 and centralized system, as claimed in claim wherein: the AC / DC power converting unit includes a full-bridge DC conversion unit and an output unit, the control unit outputs the PWM AC by the full bridge unit for AC-DC converter, and then output to the output unit via the DC bus and the bus machine.
5.根据权利要求2所述的LED集中驱动电源并机系统,其特征是:所述的电压电流双闭环控制单元包括电压外环控制环和电流内环控制环,AC/DC功率变换单元输出经电压采样电阻分压后输入电压外环控制环,与MCU控制单元输出的VADJ信号进行比较后,输出给电流内环控制环,AC/DC功率变换单元输出经电流采样电阻进行电流采样后输出给电流内环控制环,电流内环控制环输出控制PWM控制单元工作。 5. LED according to claim 2 concentration and power driving system, characterized in that: said voltage-current dual-loop control unit comprises a voltage control loop and outer inner current control loop, AC / DC power conversion unit outputs after the voltage sampling resistor divider input outer voltage control loop, the MCU VADJ compared with the control cell output signal, the output to the inner current control loop, AC / DC power conversion unit outputs the sampled current output current sampling resistor to the inner current control loop, the control loop output current loop control unit operates the PWM control.
6.根据权利要求5所述的LED集中驱动电源并机系统,其特征是:所述的电压外环控制环米用运放UlD,米样电压信号和VADJ信号同时输入运放UlD的反相输入端,运放UlD的同相输入端通过电阻R15接地。 According to claim LED 5 and the focus drive power system, characterized in that: said outer voltage control loop meters ULD op amp, voltage sample signals m and VADJ inverting op amp input signal while the ULD input terminal of op amp UlD noninverting input terminal is grounded through a resistor R15.
7.根据权利要求5所述的LED集中驱动电源并机系统,其特征是:所述的电流内环控制环米用运放UlB,米样电流信号和电压外环控制环输出信号同时输入运放UlB的反相输入端,运放UlB的同相输入端通过电阻R7接地。 The LED 5 to claim power and focus driving system, characterized in that: the inner current control loop with op amp U1B rice, rice-like outer loop control signal and a voltage current loop output signals are simultaneously input op UlB discharge inverting input terminal, the noninverting input of operational amplifier UlB is grounded via a resistor R7.
8.根据权利要求2所述的LED集中驱动电源并机系统,其特征是:所述的独立电源模块还包括均流控制环,AC/DC功率变换单元输出经电流采样电阻进行电流采样后输出给均流控制环,与监控单元输出的各个LED驱动电源单元的输入电流平均值进行比较,输出控制PWM控制单元工作。 The LED driving power supply of claim 2 and centralized system, as claimed in claim wherein: said rear module further comprises a power supply independent current-control loop, AC / DC power conversion unit outputs the sampled current output current sampling resistor a current-control loop, the average value of the input current to the respective LED driving power output from the monitoring unit comparing unit, the output control unit operates the PWM control.
9.根据权利要求8所述的LED集中驱动电源并机系统,其特征是:所述的均流控制环米用运放UlC,米样电流信号输入运放UlC的反相输入端,监控单兀输出的各个LED驱动电源单元的输入电流平均值输入运放UlC的同相输入端。 9. The concentrate of claim 8 LED driving power supply and the computer system, wherein: the average flow meter control loop with op amp ULC, rice-like current signal input operational amplifier inverting input terminal of ULC, mono monitor Wu output of each LED driving unit input current average value of the power supply input of op amp UlC-inverting input.
10.根据权利要求9所述的LED集中驱动电源并机系统,其特征是:所述的运放UlC同相输入端和反相输入端之间连接有比较电阻R29。 10. LED according to claim 9 and centralized power driving system, characterized in that: there is comparison of the resistance R29 between the op amp UlC-inverting input terminal and an inverting input terminal connected.
CN2012103121329A 2012-08-29 2012-08-29 LED (light emitting diode) centralized drive power parallel system CN102858064A (en)

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