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WO2016045644A1 - 一种母线电流控制电路、恒流驱动控制器及led光源 - Google Patents

一种母线电流控制电路、恒流驱动控制器及led光源 Download PDF

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Publication number
WO2016045644A1
WO2016045644A1 PCT/CN2015/093425 CN2015093425W WO2016045644A1 WO 2016045644 A1 WO2016045644 A1 WO 2016045644A1 CN 2015093425 W CN2015093425 W CN 2015093425W WO 2016045644 A1 WO2016045644 A1 WO 2016045644A1
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WIPO (PCT)
Prior art keywords
branch
resistor
constant current
voltage
pin
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PCT/CN2015/093425
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English (en)
French (fr)
Inventor
尤建兴
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尤建兴
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Application filed by 尤建兴 filed Critical 尤建兴
Priority to EP15843267.4A priority Critical patent/EP3200563A4/en
Priority to US15/513,898 priority patent/US10085312B2/en
Publication of WO2016045644A1 publication Critical patent/WO2016045644A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/15—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using discharge tubes only
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to an LED driving technology, in particular to a bus current control circuit, a constant current driving controller and an LED light source.
  • the luminous efficiency and luminous intensity of LEDs are increasing, and gradually become a new generation of light sources.
  • the current LED driving is mainly constant current driving, and the constant current driving circuit is realized by a dedicated LED driving chip.
  • a serial digital signal and PWM pulse width
  • the dimming control method is to adjust the pulse duty ratio of the power switch tube in the high frequency inverter by using the PWM wave to realize the adjustment of the LED output power.
  • the principle is as follows: when the power switch tube is turned on, it works in the ZVS (zero voltage switch) state, and the snubber capacitor is used to turn off the ZCS (zero current switch) working state, so that it can enter the ZVS working mode and EMI ( Electromagnetic interference) and the electrical stress of the power switch tube can be significantly reduced.
  • EMI Electromagnetic interference
  • the pulse duty of the PWM wave is too small, so that the drive current is discontinuous, the operating conditions of the ZVS will be lost, resulting in a stroboscopic condition of the LED lamp.
  • generating a PWM wave requires an external waveform generating device, which increases the complexity and cost of the circuit.
  • the invention is directed to the defect of the stroboscopic condition of the LED constant current driving circuit in the prior art, and provides a method for connecting the active branch circuit on the busbar to occupy the voltage drop on the busbar resistance, thereby realizing the busbar current magnitude of the input load.
  • a bus current control circuit characterized in that it comprises a branch resistor, a branch capacitor and a branch current source, wherein the branch resistor and the branch capacitor are connected in parallel to form a branch; one end of the branch is connected to the bus Between the resistor and the load, the other end is connected to the branch current source; the branch current source outputs a current of adjustable magnitude to the branch.
  • the branch capacitance is 0.01 to 0.22 ⁇ F, and the branch resistance is 0.5 to 2 K ⁇ .
  • the branch current source is a constant current source.
  • the constant current source includes a first triode, a second triode, an equivalent voltage input source, and a branch power supply; wherein a certain pin of the variable resistor is connected to the branch power supply, and another fixed pin is connected to the a base of the first transistor, the movable pin is connected to the base of the second transistor; the base of the first transistor is further connected to the base of the second transistor and Between the moving pins, the collector of the first transistor is on its own base, and the emitter is grounded; the collector of the second transistor serves as the output of the constant current source, and the emitter is grounded.
  • the first triode can be replaced with a first diode, wherein a positive pole of the first diode is simultaneously with a base of the other fixed pin and the second triode and the movable lead Connected between the feet, the negative pole of the first diode is grounded, and the equivalent voltage input source is a variable resistor or other variable voltage input circuit.
  • first resistor being coupled between the base of the second transistor and the movable pin; one end of the second resistor being coupled to the first Between the resistor and the base of the second transistor, the other end is connected to the other moving pin.
  • the emitter of the second transistor is grounded through a resistor.
  • the emitter of the second transistor is grounded through a resistor.
  • a constant current driving controller using the bus current control circuit characterized in that it further comprises a constant current control chip, a bus resistance, a second diode and an energy storage inductor, and the constant current control chip includes a voltage measuring pin, a second pressure measuring pin and a switch pin; the two ends of the bus bar resistor are respectively connected to the positive pole of the power supply and the load, and the negative pole of the load is connected to one end of the energy storage inductor, the energy storage inductor The other end of the second diode is connected to the anode of the second diode and the switch pin, the first voltage measuring pin is connected between the busbar resistor and the power supply; the bus current control circuit is One end of the branch circuit in which the branch resistor and the branch capacitor are connected in parallel is connected between the busbar resistor and the load, and the other end of the branch is connected to the second voltage tapping pin; the voltage on the busbar resistor and the branch resistor The sum of the voltages on it remains the same.
  • the first pressure measuring pin and the second pressure measuring pin are used to measure a voltage between the bus bar resistance and the branch resistance.
  • the constant current control chip is a switching constant current driving chip.
  • the first voltage measuring pin is a power input end of the switching constant current driving chip.
  • the constant current control chip, the bus bar resistor, the second diode, and the energy storage inductor are mixed and packaged.
  • An LED light source using the constant current driving controller characterized in that: connected to the constant current driving controller
  • the load is the LED load.
  • a bus current control circuit of the present invention comprises a branch resistor, a branch capacitor and a branch current source, wherein the branch resistor and the branch capacitor are connected in parallel to form a branch, one end of the branch is connected between the busbar resistor and the load, and the other end is connected
  • the branch current source is connected; the branch current source outputs a current of adjustable magnitude to the branch, and the sum of the voltage on the bus resistor and the voltage on the branch resistor remains unchanged.
  • the branch circuit resistor occupies part of the voltage of the busbar resistor, so that the current output on the busbar changes continuously, that is, when the current flowing into the branch increases, the voltage occupied by the branch resistor increases, and the voltage on the busbar resistor decreases. , thereby reducing the bus current. Since the branch current is smoothly adjusted by the branch current source, the adjustment of the output current on the bus is smooth. This avoids the stroboscopic phenomenon caused by the discontinuity of the driving current in the SPWM wave or the dimming switch circuit used in the prior art
  • the branch resistor Since the branch resistor is connected in parallel with a larger branch capacitor, the voltage across the branch resistor tends to be stable regardless of the voltage across the bus resistor, and does not affect the characteristics of the bus circuit itself.
  • the bus current control circuit of the invention can be connected into the busbar when in use, and does not need complicated external circuit and waveform generating circuit, which simplifies the circuit design, reduces the use cost, and is convenient and reliable.
  • the invention can be applied not only to the brightness modulation of the LED light source, but also to other fields such as motors that require constant current driving.
  • the branch current source of the invention is a constant current source, and the constant current source comprises a first triode, a second triode, a variable resistor and a branch power supply; wherein a certain pin of the variable resistor is connected to the branch power supply, Another pin is connected to the base of the first transistor, the moving pin is connected to the base of the second transistor; the collector of the second transistor is the output of the constant current source, and the emitter is grounded.
  • the continuous output of the branch current source is adjusted by a continuous change of the equivalent voltage input source such as a variable resistor (0-10V output for the lamp-controlled variable voltage input), and a continuously varying branch current is output.
  • the present invention connects the first resistor and the second resistor in the constant current source, the voltage between the base and the ground of the second transistor is proportionally attenuated with respect to the output voltage of the variable resistor, which is advantageous for supporting The fine adjustment of the circuit current can accurately set the working current of the LED and prolong the service life of the LED.
  • a constant current driving controller of the present invention connects a bus current control circuit between a busbar resistor and a load for adjusting an input load bus current. This allows the bus current control circuit to be combined with a dedicated constant current control chip, and then mixed and packaged together, which is beneficial to the stability of the component in use.
  • FIG. 1 is a schematic structural view of an LED constant current driving controller of the present invention
  • FIG. 2 is a schematic diagram of the adjustment of the bus bar resistance voltage V Rs by the constant current chip of the present invention
  • FIG. 3 is a schematic diagram of adjustment of the occupied busbar resistance voltage V Rs ' after the access branch of the present invention is accessed.
  • FIG. 4 is a schematic view showing the structure of a preferred embodiment of the branch constant current source of the present invention.
  • the LED constant current driving controller of the present invention mainly comprises a constant current control chip 1, a bus current control circuit, an LED load 3, a bus resistance R s , a diode D 1 , an energy storage inductor L 1 and a power supply VDD. .
  • the constant current control chip 1 as the switching constant current driving chip 6808 as an example, the first voltage measuring pin 11 (power input terminal VIN) and the second voltage measuring pin 12 (voltage) of the first constant current control chip 1 are mainly used.
  • Sample terminal CS) and switch pin 13 switch terminal DIM).
  • VDD power supply end of the output resistor R s is connected to the bus, the other end of the resistor R s is connected to the bus LED load 3 of the positive electrode, the negative electrode of the LED load 3 connected to the inductor L of an end of the accumulator 1, the other end of the energy storage inductor L 1 respectively
  • the anode of the diode D 1 and the switching pin 13 of the constant current control chip 1 are connected, and the cathode of the diode D 1 is connected between the bus resistor R s and the power supply VDD.
  • a bus current control circuit is connected between the bus bar resistance R s and the LED load 3.
  • Bus current control circuit includes a resistance R a bypass capacitor C 1 and the branch formed of the parallel branch, the branch and the branch of the constant current power source 2. .
  • One end of the bus branch connected to the load resistor R s is connected between the LED 3 and the other end connected to a constant current source leg 2, leg 2 is a constant current source power supply branch, branch to branch input current I Ra, in A branch resistance voltage V Ra is generated across the branch resistor R a .
  • the first voltage measuring pin 11 is connected to one end of the bus bar resistance R s close to the power supply VDD, and the second voltage measuring pin 12 is connected to the other end of the branch line away from the bus bar, the first voltage measuring pin 11 and the second pressure measuring pin 12 is used to measure the sum of the occupied busbar resistance voltage V Rs ' and the branch resistance voltage V Ra .
  • Example capacitor branch C is preferably an embodiment is 0.01 ⁇ 0.22 ⁇ F, preferably 0.1 ⁇ F, can 0.001 ⁇ F, high reliability using a common ceramic capacitors; branch resistance R a is 0.5 ⁇ 2K ⁇ , preferably 1K ⁇ .
  • the branch constant current source 2 of the bus current control circuit does not output the branch current I Ra to the branch where the branch resistance R a is located, and the power supply VDD is just inserted into the circuit.
  • the first voltage measuring pin 11 and the second voltage measuring pin 12 detect that the bus bar resistance voltage V Rs is lower than the minimum rated voltage V min , the switch pin 13 is opened, the bus bar resistance voltage V Rs , the LED load 3 , the energy storage inductor L 1.
  • the constant current control chip 1 forms a loop, the busbar resistance voltage V Rs is gradually increased, and the storage inductor L 1 is charged.
  • the switch pin 13 When the first voltage measuring pin 11 and the second voltage measuring pin 12 of the constant current control chip 1 detect that the bus bar resistance voltage V Rs is higher than the maximum rated voltage V max , the switch pin 13 is turned off, and the storage inductor L 1 is discharged. The diode D 1 is turned on, the bus bar resistance voltage V Rs , the LED load 3 , the energy storage inductor L 1 , and the diode D 1 form a loop, and the bus bar resistance voltage V Rs gradually decreases.
  • the switch pin 13 is opened, and the above steps are repeated. After the control of the constant current control chip 1, the current I Rs input to the positive pole of the LED load 3 tends to be constant, and the purpose of driving the LED constant current is achieved.
  • the branch is preferably a constant current source 2 of the present invention consists of a first transistor 21, second transistor 22, a first resistor R 1, a second resistor R 2, the variable resistor R t 4, branched A constant current source formed by the road power source 23.
  • the fixed pin R t is connected to the branch power supply 23, the other pin is connected to the base of the first transistor 21, the movable pin is connected to one end of the first resistor R 1 , and the second resistor R 2 is The terminals are respectively connected to the other end of the first resistor R 1 and the base of the first transistor 21, and the other end of the first resistor R 1 is also connected to the base of the second transistor 22; the first transistor The collector of 21 is at its own base, the emitter is grounded; the collector of the second transistor 22 serves as the output of the branch constant current source 2, and the emitter is grounded through a resistor, which is preferably 20 k ⁇ .
  • the first resistor R 1 in this embodiment is 300 to 600 K ⁇ , preferably 400 K ⁇ ; and the second resistor R 2 is 70 to 150 K ⁇ , preferably 100 K ⁇ .
  • the first transistor 21 can be replaced by a diode, wherein the anode of the diode is connected to another fixed pin of the Rt of the variable resistor, and the anode of the diode is simultaneously connected to the base of the second transistor 22 and the R of the variable resistor. t between the movable pin, negative ground diode.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

本发明涉及一种母线电流控制电路、恒流驱动控制器及LED光源，其中母线电流控制电路包括支路电阻、支路电容和支路电流源，其中支路电阻和支路电容并联构成支路，支路一端连接在母线电阻和负载之间，另一端连接支路电流源；支路电流源向支路输出大小可调的电流，母线电阻上的电压与支路电阻上的电压之和保持不变。其中支路电阻占用了母线电阻的部分电压，使母线上输出的电流大小发生连续变化，即当流入支路的电流加大时，支路电阻占用的电压加大，母线电阻上的电压减小，从而使母线电流减小。由于支路电流是通过支路电流源进行平滑地调节，因此对母线上输出电流的调节也是平滑的。这就避免了现有技术中使用SPWM波或调光开关电路中，因驱动电流不连续而产生的频闪现象。

Description

一种母线电流控制电路、恒流驱动控制器及LED光源 技术领域
本发明涉及一种LED驱动技术，特别是涉及一种母线电流控制电路、恒流驱动控制器及LED光源。
背景技术
新型半导体器件的发明和应用LED(发光二级管)的发光效率和发光强度日益增强，逐渐成为新一代光源。目前的LED的驱动主要是恒流驱动，恒流驱动电路均是通过专用的LED驱动芯片实现，在对LED进行亮度调节时，在LED恒流驱动芯片中加入串行数字信号和PWM(脉冲宽度调制)信号。这种调光控制方法是利用PWM波调节高频逆变器中功率开关管的脉冲占空比，实现LED输出功率的调节。
其原理在于：使功率开关管导通时工作在ZVS(零电压开关)状态，关断瞬间需采用吸收电容以达到ZCS(零电流开关)工作状态，这样既可进入ZVS工作方式，同时EMI(电磁干扰)和功率开关管的电应力可明显降低。但是如果PWM波的脉冲占空比太小，以致于驱动电流不连续，将会失去ZVS的工作条件，导致LED灯出现频闪状况。除此之外，产生PWM波需要一个外接的波形发生装置，加大了电路的复杂度和成本。
发明内容
本发明针对现有技术中LED恒流驱动电路存在频闪状况的缺陷，提供一种通过在母线上连接有源支路，占用母线电阻上的压降，从而实现对输入负载的母线电流大小进行连续调整的母线电流控制电路，使用该电路的恒流驱动控制器，以及使用该恒流驱动控制器的LED光源。
本发明的技术方案如下：
一种母线电流控制电路，其特征在于：它包括支路电阻、支路电容和支路电流源，其中所述支路电阻和支路电容并联构成支路；所述支路的一端连接在母线电阻和负载之间，另一端连接所述支路电流源；所述支路电流源向所述支路输出大小可调的电流。
所述支路电容为0.01～0.22μF，所述支路电阻为0.5～2KΩ。
所述支路电流源为一恒流源。
所述恒流源包括第一三极管、第二三极管、等效电压输入源、支路电源；其中可变电阻的一定引脚连接所述支路电源，另一定引脚连接所述第一三极管的基极，动引脚连接所述第二三极管的基极；所述第一三极管的基极还连接在所述第二三极管的基极和所述动引脚之间，所述第一三极管的集电极在自己的基极上，发射极接地；所述第二三极管的集电极作为所述恒流源的输出，发射极接地。
所述第一三极管可替换为第一二极管，其中所述第一二极管的正极同时与所述另一定引脚和所述第二三极管的基极和所述动引脚之间连接，所述第一二极管的负极接地，所述等效电压输入源为可变电阻或其他可变电压输入电路。
它还包括第一电阻和第二电阻，所述第一电阻连接在所述第二三极管的基极和所述动引脚之间；所述第二电阻的一端连接在所述第一电阻和所述第二三极管的基极之间，另一端连接在所述另一动引脚上。
所述第二三极管的发射极通过一电阻接地。
所述第二三极管的发射极通过一电阻接地。
一种使用所述的母线电流控制电路的恒流驱动控制器，其特征在于：它还包括恒流控制芯片、母线电阻、第二二极管和蓄能电感，所述恒流控制芯片包括第一测压管脚、第二测压管脚和开关管脚；所述母线电阻的两端分别连接供电电源和负载的正极，负载的负极连接所述蓄能电感的一端，所述蓄能电感的另一端连接所述第二二极管的正极和所述开关管脚，所述第一测压管脚连接在所述母线电阻与所述供电电源之间；所述母线电流控制电路中由支路电阻和支路电容并联构成的支路的一端连接在母线电阻和负载之间，支路另一端连接所述第二测压管脚；所述母线电阻上的电压与所述支路电阻上的电压之和保持不变。
所述第一测压管脚、第二测压管脚用于测量所述母线电阻和所述支路电阻之间的电压。
所述恒流控制芯片为开关式恒流驱动芯片。
所述第一测压管脚为所述开关式恒流驱动芯片的电源输入端。
所述恒流控制芯片、母线电阻、第二二极管和蓄能电感进行混合封装。
一种使用所述的恒流驱动控制器的LED光源，其特征在于：与所述恒流驱动控制器连接 的负载为LED负载。
本发明的技术效果如下：
本发明的一种母线电流控制电路包括支路电阻、支路电容和支路电流源，其中支路电阻和支路电容并联构成支路，支路一端连接在母线电阻和负载之间，另一端连接支路电流源；支路电流源向支路输出大小可调的电流，母线电阻上的电压与支路电阻上的电压之和保持不变。其中支路电阻占用了母线电阻的部分电压，使母线上输出的电流大小发生连续变化，即当流入支路的电流加大时，支路电阻占用的电压加大，母线电阻上的电压减小，从而使母线电流减小。由于支路电流是通过支路电流源进行平滑地调节，因此对母线上输出电流的调节也是平滑的。这就避免了现有技术中使用SPWM波或调光开关电路中，因驱动电流不连续而产生的频闪现象。
由于支路电阻和一个较大的支路电容并联，无论母线电阻上的电压如何变化，支路电阻上的电压都趋于稳定，不会对母线电路本身的特性造成影响。
本发明的母线电流控制电路在使用时只要接入母线中即可，无需复杂的外接电路和波形发生电路，简化了电路设计，降低使用成本，且方便可靠。本发明不但可应用于LED光源的亮度调制，还可应用于电机等其他需要进行恒流驱动的领域。
本发明的支路电流源为恒流源，其恒流源包括第一三极管、第二三极管、可变电阻、支路电源；其中可变电阻的一定引脚连接支路电源，另一定引脚连接第一三极管的基极，动引脚连接第二三极管的基极；第二三极管的集电极作为恒流源的输出，发射极接地。通过如可变电阻器这样的等效电压输入源的连续变化(0-10V输出用于灯控可变电压输入)，调整支路电流源的输出电流，输出连续变化的支路电流。由于本发明在上述恒流源中接入第一电阻和第二电阻，使第二三极管的基极与接地点之间的电压相对于可变电阻的输出电压成比例衰减，有利于支路电流的微调，可准确设置LED的工作电流，延长LED的使用寿命。
本发明的一种恒流驱动控制器，在母线电阻和负载之间连接母线电流控制电路，用以对输入负载母线电流进行调节。这样使得母线电流控制电路与专用的恒流控制芯片相结合，之后混合封装在一起，有利于元件在使用中的稳定性。
附图说明
图1是本发明的LED恒流驱动控制器的结构示意图
图2是本发明的恒流芯片对母线电阻电压VRs的调节示意图
图3是本发明接入支路后对占用后母线电阻电压VRs'的调节示意图
图4是本发明的支路恒流源的优选方案结构示意图
具体实施方式
下面结合附图对本发明进行说明。
如图1所示，本发明的LED恒流驱动控制器主要包括恒流控制芯片1、母线电流控制电路、LED负载3、母线电阻Rs、二极管D1、蓄能电感L1和供电电源VDD。以恒流控制芯片1为开关式恒流驱动芯片6808为例，主要使用第一恒流控制芯片1的第一测压管脚11(电源输入端VIN)、第二测压管脚12(电压采样端CS)和开关管脚13(开关端DIM)。供电电源VDD的输出连接母线电阻Rs的一端，母线电阻Rs的另一端连接LED负载3的正极，LED负载3的负极连接蓄能电感L1的一端，蓄能电感L1的另一端分别连接二极管D1的正极和恒流控制芯片1的开关管脚13，二极管D1的负极连接在母线电阻Rs与供电电源VDD之间。
母线电阻Rs和LED负载3之间连接母线电流控制电路。母线电流控制电路包括由支路电阻Ra和支路电容C1并联构成的支路，以及为支路供电的支路恒流源2。。支路的一端连接在母线电阻Rs和LED负载3之间连接，另一端连接支路恒流源2，支路恒流电源2为支路供电，为支路输入支路电流IRa，在支路电阻Ra上产生支路电阻电压VRa。第一测压管脚11连接在母线电阻Rs靠近供电电源VDD的一端，第二测压管脚12连接支路远离母线的另一端，第一测压管脚11和第二测压管脚12用于测量占用后母线电阻电压VRs'与支路电阻电压VRa之和。本实施例中的支路电容C1优选为0.01～0.22μF，优选0.1μF，也可以0.001μF，采用通用高可靠度陶瓷电容；支路电阻Ra为0.5～2KΩ，优选1KΩ。
如图2所示，当母线电流控制电路的支路恒流源2并不向支路电阻Ra所在的支路输出支路电流IRa，且供电电源VDD刚接入电路中时。第一测压管脚11和第二测压管脚12检测到母线电阻电压VRs低于最小额定电压Vmin，开关管脚13打开，母线电阻电压VRs、LED负载3、蓄能电感L1、恒流控制芯片1形成回路，母线电阻电压VRs逐渐升高，蓄能电感L1充电。当恒流控制芯片1的第一测压管脚11和第二测压管脚12检测到母线电阻电压VRs高于最大额定 电压Vmax时，开关管脚13关闭，蓄能电感L1放电，二极管D1导通，母线电阻电压VRs、LED负载3、蓄能电感L1、二极管D1形成回路，母线电阻电压VRs逐渐下降。当恒流控制芯片1的第一测压管脚11和第二测压管脚12检测到母线电阻电压VRs降至最小额定电压Vmin时，开关管脚13打开，重复上述步骤。经过恒流控制芯片1的控制，使输入LED负载3正极的电流IRs趋于恒定，达到对LED恒流驱动的目的。
如图3所示，当母线电流控制电路的支路恒流源2向支路电阻Ra所在的支路输出支路电流IRa，支路电阻Ra占用母线电阻Rs处的母线电阻电压VRs，使占用后母线电阻电压VRs'+支路电阻电压VRa＝母线电阻电压VRs，则在恒流控制芯片1第一测压管脚11和第二测压管脚12之间的测量值不变。当支路恒流源2输出的支路电流IRa大小发生连续变化时，支路电阻电压VRa也随之发生线性变化。当支路电流IRa变大、支路电阻电压VRa变大时，占用后母线电阻电压VRs'变小，从而输入LED负载3正极的母线电流IRs也变小，LED的亮度变低；反之，当支路电流IRa变小，输入LED负载3正极的母线电流IRs变大，将引起LED的亮度变高。以此通过一个简单电路实现对LED亮度的连续、平滑调节，调节后的最大额定电压Vmax随之降为Vmax'，最小额定电压Vmin随之降为Vmin'。
如图4所示，本发明的支路恒流源2优选由第一三极管21、第二三极管22、第一电阻R1、第二电阻R2、可变电阻Rt、支路电源23构成的恒流源。其中可变电阻Rt的一定引脚连接支路电源23，另一定引脚连接第一三极管21的基极，动引脚连接第一电阻R1的一端；第二电阻R2的两端分别与第一电阻R1的另一端和第一三极管21的基极连接，并且第一电阻R1的另一端还与第二三极管22的基极连接；第一三极管21的集电极在自己的基极上，发射极接地；第二三极管22的集电极作为支路恒流源2的输出，发射极通过一个电阻接地，该电阻优选20KΩ。本实施例中的第一电阻R1为300～600KΩ，优选400KΩ；第二电阻R2为70～150KΩ，优选100KΩ。
第一三极管21可替换为一个二极管，其中二极管的正极与可变电阻的Rt另一定引脚连接，二极管的正极同时连接在第二三极管22的基极和可变电阻的Rt动引脚之间，二极管的负极接地。
应当指出，以上所述具体实施方式可以使本领域的技术人员更全面地理解本发明创造，但不以任何方式限制本发明创造。因此，尽管本说明书参照附图和实施例对本发明创造已进行了详细的说明，但是，本领域技术人员应当理解，仍然可以对本发明创造进行修改或者等 同替换，总之，一切不脱离本发明创造的精神和范围的技术方案及其改进，其均应涵盖在本发明创造专利的保护范围当中。

Claims (10)

  1. 一种母线电流控制电路，其特征在于：它包括支路电阻、支路电容和支路电流源，其中所述支路电阻和支路电容并联构成支路；所述支路的一端连接在母线电阻和负载之间，另一端连接所述支路电流源；所述支路电流源向所述支路输出大小可调的电流。
  2. 如权利要求1所述的一种母线电流控制电路，其特征在于：所述支路电容为0.01～0.22μF，所述支路电阻为0.5～2KΩ，所述支路电流源为一恒流源。
  3. 如权利要求1或2所述的一种母线电流控制电路，其特征在于：所述恒流源包括第一三极管、第二三极管、等效电压输入源、支路电源；其中可变电阻的一定引脚连接所述支路电源，另一定引脚连接所述第一三极管的基极，动引脚连接所述第二三极管的基极；所述第一三极管的基极还连接在所述第二三极管的基极和所述动引脚之间，所述第一三极管的集电极在自己的基极上，发射极接地；所述第二三极管的集电极作为所述恒流源的输出，发射极接地。
  4. 如权利要求3所述的一种母线电流控制电路，其特征在于：所述第一三极管可替换为第一二极管，其中所述第一二极管的正极同时与所述另一定引脚和所述第二三极管的基极和所述动引脚之间连接，所述第一二极管的负极接地，所述等效电压输入源为可变电阻或其他可变电压输入电路。
  5. 如权利要求4所述的一种母线电流控制电路，其特征在于：它还包括第一电阻和第二电阻，所述第一电阻连接在所述第二三极管的基极和所述动引脚之间；所述第二电阻的一端连接在所述第一电阻和所述第二三极管的基极之间，另一端连接在所述另一动引脚上；所述第二三极管的发射极通过一电阻接地。
  6. 一种使用如权利要求1～5之一所述的母线电流控制电路的恒流驱动控制器，其特征在于：它还包括恒流控制芯片、母线电阻、第二二极管和蓄能电感，所述恒流控制芯片包括第一测压管脚、第二测压管脚和开关管脚；所述母线电阻的两端分别连接供电电源和负载的正极，负载的负极连接所述蓄能电感的一端，所述蓄能电感的另一端连接所述第二二极管的正极和所述开关管脚，所述第一测压管脚连接在所述母线电阻与所述供电电源之间；所述母线电流控制电路中由支路电阻和支路电容并联构成的支路的一端连接在母线电阻和负载之间，支路另一端连接所述第二测压管脚；所述母线电阻上的电压与所述支路电阻上的电压之和保持不变。
  7. 如权利要求6所述的一种恒流驱动控制器，其特征在于：所述第一测压管脚、第二测压管脚用于测量所述母线电阻和所述支路电阻之间的电压。
  8. 如权利要求6或7所述的一种恒流驱动控制器，其特征在于：所述恒流控制芯片为开关式恒流驱动芯片；所述第一测压管脚为所述开关式恒流驱动芯片的电源输入端。
  9. 如权利要求6或7或8所述的一种恒流驱动控制器，其特征在于：所述恒流控制芯片、母线电阻、第二二极管和蓄能电感进行混合封装。
  10. 一种使用如权利要求6～9之一所述的恒流驱动控制器的LED光源，其特征在于：与所述恒流驱动控制器连接的负载为LED负载。
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