WO2018054135A1 - 发光二极管装置 - Google Patents

发光二极管装置 Download PDF

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Publication number
WO2018054135A1
WO2018054135A1 PCT/CN2017/092394 CN2017092394W WO2018054135A1 WO 2018054135 A1 WO2018054135 A1 WO 2018054135A1 CN 2017092394 W CN2017092394 W CN 2017092394W WO 2018054135 A1 WO2018054135 A1 WO 2018054135A1
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voltage
control unit
led
input signal
led string
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PCT/CN2017/092394
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English (en)
French (fr)
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高延增
吴明浩
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漳洲立达信光电子科技有限公司
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Publication of WO2018054135A1 publication Critical patent/WO2018054135A1/zh

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    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • 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
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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]
    • 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
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the invention relates to the field of illumination, and in particular to the field of light emitting diode (LED) devices.
  • LED light emitting diode
  • LED light sources have the advantages of high luminous efficiency, low heat generation, power saving and long life, so their applications are becoming more and more extensive. LED lamps will gradually replace traditional lighting fixtures such as incandescent and halogen lamps. With the development of LED lamps, the trend of LED lamps towards miniaturization of the structure has been driven. At present, the common LED lamp driving circuit on the market uses an electrolytic capacitor to filter after rectifying the input voltage. Inductors and transformers are also required in the circuit.
  • the electrolytic capacitor is bulky and takes up a large space of the drive circuit, it is difficult to further miniaturize the drive circuit. Moreover, the life of the electrolytic capacitor is greatly affected by the ambient temperature of the driving circuit space, which causes the electrolytic capacitor to fail prematurely, resulting in a shortened life of the entire lamp. Larger inductors and transformer volumes also make it difficult to miniaturize the drive structure.
  • One of the objects of the present invention is to provide a power saving LED device.
  • Another object of the present invention is to provide an LED device which can avoid peak heat generation when both the input voltage value and the drive current are high.
  • an LED device comprises a first LED string, a second LED string, a rectifier module and a control unit.
  • the rectifier module receives the input signal.
  • the control unit is coupled to the first LED string and the second LED string.
  • the control unit is connected to the rectifier module.
  • the control unit outputs an output current.
  • the output current includes a drive current flowing through the first LED string and the second LED string.
  • the control unit When the input signal is between the threshold voltage and the sum voltage, the control unit cuts off the drive current.
  • the sum voltage is at least the sum of the turn-on voltage of the first LED string and the turn-on voltage of the second LED string.
  • a control unit for an LED driving circuit drives a plurality of LED strings.
  • the control unit includes an input voltage detecting unit, a switch combination, and an adjustment module.
  • the input voltage detecting unit detects the voltage value of the input signal to generate a detection output.
  • the switch combination is connected to the input voltage detection unit. When the input voltage detecting unit determines that the voltage value of the input signal is lower than a preset value, the switch combination connects the LED strings in parallel. When the input voltage detecting unit determines that the voltage value of the input signal is higher than a preset value, the switch combination connects the LED strings in series.
  • the adjustment module generates a drive current for the LED string.
  • the drive current is interrupted while the switch combination switches the LED string between the parallel connection and the series connection.
  • an LED device comprises a set of LED strings, a rectifier module and a control unit.
  • the rectifier module rectifies the input signal.
  • the control unit is connected to the rectifier module.
  • the control unit outputs the drive current of the set of LED strings.
  • the control unit intercepts this drive current for a period of time.
  • the drive current has a first current value before the drive current is cut off.
  • the drive current has a second current value after the drive current is cut off to reopened.
  • the first current value is different from the second current value.
  • An embodiment of an LED device is illustrated.
  • control unit An embodiment of the control unit will be described.
  • Figure 1 illustrates an embodiment of an LED device.
  • Figure 2 illustrates the waveform of the input signal and output current.
  • Figure 3 illustrates an embodiment of a control unit.
  • Figure 4 illustrates an embodiment of an adjustment module and its corresponding adjustment switch.
  • Figure 5 illustrates three examples of regulators.
  • Figure 6 illustrates three other examples of regulators.
  • an LED device 100 includes a plurality of LED strings 20, a rectifier module 10, and a control unit 30, in accordance with an embodiment.
  • the LED string 20 includes a first LED string 21 and a second LED string 22.
  • the rectifier module 10 performs full-wave rectification of the AC input.
  • the resistor 40 can be placed on the path of the output current of the control unit 30. One end of the resistor 40 is grounded. Resistor 40 can also be used to regulate the output current. Although only two LED strings are used in this example, more than two LED strings can be used for the LED device 30.
  • the first LED string 21 has a first turn-on voltage.
  • the second LED string 21 has a second turn-on voltage.
  • the rectifier module 10 receives the input signal Uin.
  • the control unit 30 is connected to the first LED string 21 and the second LED string 22.
  • the control unit 30 is connected to the rectifier module 10.
  • the control unit 30 outputs an output current Iout.
  • the output current Iout includes a drive current flowing through the first LED string 21 and the second LED string 22.
  • the drive current is used to drive the LED string 20.
  • the first light string 21 may include a plurality of light emitting diodes.
  • the second string 22 can include a plurality of light emitting diodes.
  • control unit 30 further includes a switch combination 31.
  • the switch combination 31 When the voltage value of the input signal Uin is higher than the first preset voltage value U1 but lower than the second preset voltage value U2, the switch combination 31 is connected in parallel to the first LED string 21 and the second LED string 22.
  • the switch combination 31 When the voltage value of the input signal Uin is higher than the second preset voltage value U2, the switch combination 31 is connected in series to the first LED string 21 and the second LED string 22.
  • the first preset voltage value U1 is greater than or equal to any of the first turn-on voltage and the second turn-on voltage.
  • the second predetermined voltage value U2 is greater than or equal to the sum of the first turn-on voltage of the first LED string 21 and the second turn-on voltage of the second LED string 22.
  • the switch combination 31 includes a first switch 311, a second switch 312, and a third switch 313.
  • the first switch 311 When the voltage value of the input signal Uin is higher than the first preset voltage value U1 and lower than the second preset voltage value U2, the first switch 311 is connected (closed), the second switch 312 is closed, and the third switch 313 is turned off. (ON), the first LED string 21 and the second LED string 22 are connected in parallel.
  • the first switch 311 is turned on, the second switch 312 is turned on, and the third switch 313 is turned off, so that the first LED string 21 and the second LED string are turned on. 22 connected in series.
  • the first preset voltage value U1 is any one of a first turn-on voltage and a second turn-on voltage. In some embodiments, the first turn-on voltage is the same as the second turn-on voltage. In some embodiments, when the input signal Uin is lower than the first preset voltage value U1, the first switch 311 and the second switch 312 are both turned off (connected), and the third switch 313 is turned on (off).
  • the first LED string 21 and the second LED string 22 are connected in parallel, and a certain current flows through each of the LED strings.
  • the output current Iout is I1, which is the same as the sum of the constant currents flowing through the LED string.
  • the control unit 30 cuts off the drive current.
  • the sum voltage is at least the sum of the first turn-on voltage and the second turn-on voltage. In some embodiments, the sum voltage is a second predetermined voltage value U2.
  • the threshold voltage Uth can be detected by the input detecting unit 502. In some embodiments, detection of the threshold voltage Uth can be performed outside of the control unit 30. In some embodiments, the threshold voltage Uth can be written externally.
  • the control unit 30 cuts off the drive current from being turned back on.
  • the control unit 30 connects the first LED string 21 and the second LED string in series.
  • the drive current which is the output current, is I2.
  • the sum voltage is at least twice the turn-on voltage of any of the LED strings. In some embodiments, the sum voltage is a second predetermined voltage U2.
  • the control unit 30 cuts off the drive current.
  • the control unit 30 connects the first LED string 21 and the second LED string 22 in parallel.
  • the sum voltage is at least twice the turn-on voltage of any of the LED strings. In some embodiments, the sum voltage is a second predetermined voltage value U2.
  • the control unit 30 cuts off the drive current from being turned back on. In this case, the first LED string 21 is still connected in parallel to the second LED string 22.
  • the drive current is turned off.
  • the control unit 30 further includes an adjustment module 504 that generates a constant current to each of the first LED string 21 and the second LED string 22.
  • the rectifier module 10 is a bridge rectifier.
  • the LED device 100 further includes a resistor connected between the rectifier module 10 and the control unit 30.
  • the adjustment module 504 is for providing an appropriate drive current for the LED string.
  • the adjustment module 504 is for providing an appropriate drive current for the LED string.
  • the control unit 30 of an LED drive circuit 100 is disclosed in accordance with another embodiment.
  • the drive circuit 100 drives a plurality of LED strings.
  • the control unit 30 includes an input voltage detecting unit 502, a switch combination 503, and an adjustment module 504.
  • the input voltage detecting unit 502 detects the voltage value of the input signal Uin to generate a detected output signal.
  • the switch combination 503 is connected to the input voltage detecting unit 502. When the input voltage detecting unit 502 determines that the voltage value of the input signal is lower than the preset value, the switch combination 503 is connected in parallel to the at least one LED string subgroup.
  • the LED string subset is a subset of all LED strings.
  • the switch combination 503 is connected in series to the LED string subgroup.
  • the preset value is a voltage value U2.
  • the adjustment module 504 generates a drive current for the subset of LED strings.
  • the drive current is interrupted during the switch combination to switch the subset of the light-emitting diode strings between the parallel connection and the series connection.
  • the adjustment module 504 includes a plurality of regulators (REG 0 604, REG 1 605 and REG 2 606).
  • Corresponding adjustment switches 607, 608, 609 are connected to the regulators (REG0 604, REG 1 605 and REG) 2 606).
  • the adjustable switches 607, 608, and 609 can be turned on or off to provide a suitable LED string current value. If the adjustment switches 607, 608, and 609 are all turned off, all of the drive current can be cut off.
  • a group of LED strings are connected to the regulator REG0 via adjustment switches 607, 608 and 609. 604, REG 1 605 and REG 2 606.
  • the set of LED strings can be divided into a first subset 601 and a second subset 602.
  • the first subset 601 can include a plurality of LED unit light strings 603. In this embodiment, all of the LED unit light strings 603 in the first subset 601 are connected in parallel.
  • the second subset 602 can include a plurality of light emitting diode unit light strings 603.
  • the second subset 602 two strings of LED unit strings 603 are connected in series, and in turn, longer LED strings are connected in parallel. Any possible parallel connection or series connection can be implemented by a combination of switches as long as the appropriate switches are provided plus the correct connections.
  • the third subset and the fourth subset of LED strings 603 can implement different forms of parallel or series connections.
  • adjustment switches 607, 608, and 609 can be implemented within switch combination 504.
  • control unit 30 intercepts the drive current when the input signal Uin is in the rising phase and when the voltage value of the input signal Uin is above the threshold voltage Uth.
  • switch combination 503 includes a set of adjustment switches 607, 608, and 609 for controlling adjustment module 504, and control unit 30 can interrupt the drive current by opening the set of adjustment switches 607, 608, and 609.
  • the conditioning module 504 further includes a plurality of regulators 604, 605, and 606 to provide drive current.
  • the input voltage detecting unit 502 is a comparator that compares the voltage value of the input signal Uin with a preset value.
  • the control unit 30 further includes a logic circuit 505, a switch combination 503, and an adjustment module 504 that control the input voltage detection unit 502.
  • the LED device 100 includes a set of LED strings 21 and 22, a rectifier module 10, and a control unit 30.
  • the rectifier module 10 rectifies the input signal Uin.
  • the control unit 30 is connected to the rectifier module 10.
  • the control unit 30 outputs the drive currents of the LED strings 21, 22.
  • Control unit 30 intercepts the drive current for a period of time.
  • the drive current has a first current value before the drive current is cut off. After the drive current is cut off to re-opened, the drive current has a second current value, and the first current value is different from the second current value.
  • the first current value is I1 and the second current value is I2.
  • the first current value is I2 and the second current value is I1.
  • the control unit 30 intercepts the drive current when the input signal Uin is in the rising phase and when the voltage value of the input signal Uin is above the threshold voltage Uth. In some embodiments, when the input signal Uin is in the rising phase and when the voltage value of the input signal Uin is higher than the sum voltage, the control unit 30 switches the drive current from being turned off to being turned back on.
  • the sum voltage is at least twice the turn-on voltage of any of the LED strings. In some embodiments, the sum voltage is a second predetermined voltage value U2.
  • control unit 30 intercepts the drive current when input signal Uin is in the falling phase and when the voltage value of the input voltage is lower than the sum voltage.
  • the sum voltage is at least twice the turn-on voltage of any of the LED strings.
  • the control unit 30 switches the drive current from being turned off to being turned back on.
  • Figure 5 illustrates three examples of regulators.
  • Figure 6 illustrates three other examples of regulators.
  • Each of the regulators of Figures 5 and 6 can be a design choice for implementing a suitable current source.
  • Each regulator has a corresponding I-V curve that exhibits its characteristics when different voltages and currents are applied.
  • the LED driving circuit of the present invention does not use electrolytic capacitors, inductors and transformers, but uses a newly designed segmented constant current integrated circuit, the series/parallel relationship between each LED string can be flexibly combined and switched. Thereby greatly reducing the footprint.
  • the drive circuit is easy to miniaturize and reduces cost.
  • the LED driver circuit can therefore be used in situations where space is tight and there is a high demand for device size, such as MR16 and candle.
  • the driving circuit of the LED string is cut off at a specific cycle, so that the thermal problem of the integrated circuit caused by the high voltage difference is reduced.
  • the LED device 30 is more power efficient. The LED device 30 can avoid peak heat generation when both the input voltage value and the drive current are high.

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Abstract

一种发光二极管装置（100），该发光二极管装置（100）包括第一发光二极管灯串（21）、第二发光二极管灯串（22）、整流模组（10）及控制单元（30）。控制单元（30）产生流经第一发光二极管灯串（21）及第二发光二极管灯串（22）的驱动电流。当输入信号（Uin）介于阈值电压（Uth）及总和电压之间时，控制单元（30）截断驱动电流。该发光二极管装置（100）不但可以节约电能，而且当输入电压值及驱动电流皆高时可以避免在峰值时的发热。

Description

发光二极管装置
本发明是关于照明领域，且特别是关于发光二极管（LED， Light Emitting Diode）装置的领域。
发光二极管光源具有高发光效率、低发热、省电和寿命长的优点，因此其应用愈来愈广泛。发光二极管灯将逐渐取代如白炽灯和卤素灯等传统照明灯具。随着发光二极管灯的发展，驱使发光二极管灯朝向结构微型化的趋势。目前市场上常见的发光二极管灯驱动电路是在整流输入电压后，使用电解电容来滤波。电路中也需要使用电感和变压器。
因为电解电容体积大，占用了较大的驱动电路空间，驱动电路难以进一步微型化。而且电解电容的寿命受到驱动电路空间的环境温度影响非常大，使得电解电容过早失效，造成整灯的寿命缩短。较大的电感和变压器体积亦造成驱动结构难以微型化。
本发明的其中一个目的是提供一种省电的发光二极管装置。
本发明的另一个目的是提供一种当输入电压值及驱动电流皆高时可以避免峰值发热的发光二极管装置。
根据本发明的一个方面，其揭露了一种发光二极管装置。发光二极管装置包括第一发光二极管灯串、第二发光二极管灯串、整流模块及控制单元。
整流模块接收输入信号。控制单元连接至第一发光二极管灯串以及第二发光二极管灯串。控制单元连接至整流模块。控制单元输出一输出电流。输出电流包括流经第一发光二极管燈串及第二发光二极管灯串的驱动电流。
当输入信号介于阈值电压及总和电压之间时，控制单元截断驱动电流。总和电压至少是第一发光二极管灯串的开启电压及第二发光二极管灯串的开启电压之总和。
根据本发明的另一方面，其揭露了一种发光二极管驱动电路的控制单元。驱动电路驱动多数个发光二极管串。控制单元包括输入电压侦测单元、开关组合及调节模块。
输入电压侦测单元侦测输入信号的电压值以产生一侦测输出。开关组合连接至输入电压侦测单元。当输入电压侦测单元判断输入信号的电压值低于预设值时，开关组合将发光二极管灯串并联连接。当输入电压侦测单元判断输入信号的电压值高于预设值时，开关组合将发光二极管灯串串联连接。
调节模块产生发光二极管灯串的驱动电流。在开关组合将发光二极管灯串于并联连接与串联连接之间作切换的期间，截断驱动电流。
根据本发明的又另一个方面，其揭露了一种发光二极管装置。发光二极管装置包括一组发光二极管灯串、一整流模块以及一控制单元。
整流模块整流输入信号。控制单元连接至整流模块。控制单元输出此组发光二极管灯串的驱动电流。控制单元在一期间内截断此驱动电流。在截断驱动电流前，驱动电流具有第一电流值。在驱动电流从被截断至重新开启后，驱动电流具有第二电流值。第一电流值不同于第二电流值。
 图1
说明一种发光二极管装置的实施例。
图2
说明输入信号及输出电流的波形。
图3
说明控制单元的实施例。
图4
说明调节模块及其对应的调节开关的实施例。
图5
说明调节器的三个示例。
图6
说明调节器的另三个示例。
下面结合附图与具体实施方式对本发明发光二极管装置作进一步描述。
图1说明一种发光二极管装置的实施例。图2说明输入信号及输出电流的波形。图3说明控制单元的实施例。图4说明调节模块及其对应的调节开关的实施例。图5说明调节器的三个示例。图6说明调节器的另三个示例。参考图1及图2，根据一实施例，发光二极管装置100包括多数个发光二极管灯串20、整流模块10以及控制单元30。
发光二极管灯串20包括第一发光二极管灯串21及第二发光二极管灯串22。在一些实施例中，整流模块10对交流输入进行全波整流。电阻40可以放置于控制单元30的输出电流之路径上。电阻40的一端接地。电阻40也可以用来调整输出电流。虽然在此例子中只使用两个发光二极管灯串，两个以上的发光二极管灯串可使用于发光二极管装置30。
第一发光二极管灯串21具有第一开启电压。第二发光二极管灯串21具有第二开启电压。整流模块10接收输入信号Uin。控制单元30连接至第一发光二极管灯串21及第二发光二极管灯串22。控制单元30连接至整流模块10。控制单元30输出输出电流Iout。输出电流Iout包括流经第一发光二极管灯串21及第二发光二极管灯串22的驱动电流。驱动电流用来驱动发光二极管灯串20。第一灯串21可包括多个发光二极体。第二灯串22可包括多个发光二极体。
参考图1及图2，在一些实施例中，控制单元30更包括开关组合31。当输入信号Uin的电压值高于第一预设电压值U1但低于第二预设电压值U2时，开关组合31并联连接第一发光二极管灯串21及第二LED灯串22。当输入信号Uin的电压值高于第二预设电压值U2时，开关组合31串联连接第一发光二极管灯串21及第二发光二极管灯串22。
在一些实施例中，第一预设电压值U1大于或等于第一开启电压及第二开启电压中之任一个。在一些实施例中，第二预设电压值U2大于或等于第一发光二极管灯串21的第一开启电压和第二发光二极管灯串22的第二开启电压的总和。
参考图1，在一些实施例中，开关组合31包括第一开关311、第二开关312及第三开关313。当输入信号Uin的电压值高于第一预设电压值U1且低于第二预设电压值U2时，第一开关311连接上(关上)、第二开关312关上且第三开关313断开(打开)，使得第一发光二极管灯串21及第二发光二极管灯串22并联连接。当输入信号Uin的电压值高于第二预设电压值时，第一开关311打开、第二开关312打开且第三开关313关上，使得第一发光二极管灯串21及第二发光二极管灯串22串联连接。
参考图2，在一些实施例中，当输入信号Uin的电压值低于第一开启电压及第二开启电压中之任一个时，将无驱动电流流经第一发光二极管灯串21或第二发光二极管灯串22。在一些实施例中，第一预设电压值U1是第一开启电压及第二开启电压中的任一个。在一些实施例中，第一开启电压与第二开启电压相同。在一些实施例中，当输入信号Uin低于第一预设电压值U1时，第一开关311及第二开关312皆关上（連接），而第三开关313打开（断开）。
当输入信号Uin上升且超过第一预设电压值U1时，第一发光二极管灯串21及第二发光二极管灯串22并联连接，且有一定电流流经每一个发光二极管灯串。在一些实施例中，输出电流Iout为I1，其与流经发光二极管灯串的定电流的总和相同。
在输入信号Uin的上升相位中，当输入信号Uin的电压值持续上升且变成高于阈值电压Uth但低于总合电压时，控制单元30截断驱动电流。在一些实施例中，总合电压至少是第一开启电压及第二开启电压的总和。在一些实施例中，总合电压是第二预设电压值U2。
如图3所示，在一些实施例中，可以由输入侦测单元502来侦测阈值电压Uth。在一些实施例中，可以在控制单元30之外实施阈值电压Uth的侦测。在一些实施例中，阈值电压Uth可以由外部来编写。
在输入信号Uin的上升相位中，当输入信号Uin的电压值持续上升且变成高于总和电压时，控制单元30将驱动电流由截断至重新开启。控制单元30串联连接第一发光二极管灯串21及第二发光二极管灯串。而驱动电流，也就是输出电流，为I2。总合电压至少是两倍的任一个发光二极管灯串的开启电压。在一些实施例中，总合电压是第二预设电压U2。
当输入信号Uin变成下降相位，且输入信号Uin的电压值低于总合电压时，控制单元30截断驱动电流。控制单元30并联连接第一发光二极管灯串21及第二发光二极管灯串22。总和电压至少是两倍的任一个发光二极管灯串的开启电压。在一些实施例中，总和电压是第二预设电压值U2。
当输入信号Uin的电压值持续下降且变成低于阈值电压，控制单元30将驱动电流由截断至重新开启。在此情况中，第一发光二极管灯串21仍然并联连接第二发光二极管灯串22。当输入信号Uin的电压持续下降且变成低于第一预设电压值U1时，关掉驱动电流。
在一些实施例中，控制单元30更包括产生定电流给每一个第一发光二极管灯串21及第二发光二极管灯串22的调节模块504。在一些实施例中，整流模块10是桥式整流器。在一些实施例中，发光二极管装置100更包括连接于整流模块10与控制单元30之间的的电阻。调节模块504是用来提供发光二极管灯串适当的驱动电流。调节模块504是用来提供发光二极管灯串适当的驱动电流。当控制单元30改变发光二极管灯串20的连接方式时，调节模块504调整驱动电流以确保每个发光二极管灯串具有适当的定电流。换句话说，调节模块504提供每一个发光二极管灯串适当的恒流。
参考图1、图3及图4，根据另一个实施例，揭露了一种发光二极管驱动电路100的控制单元30。驱动电路100驱动多个发光二极管串。控制单元30包括输入电压侦测单元502、开关组合503以及调节模块504。
输入电压侦测单元502侦测输入信号Uin之电压值以产生一侦测的输出的信号。开关组合503连接至输入电压侦测单元502。当输入电压侦测单元502判断输入信号的电压值低于预设值时，开关组合503并联连接至少一个发光二极管灯串子集组。发光二极管灯串子集组是所有发光二极管灯串的一个子集合。当输入电压侦测单元502判断输入信号的电压值高于一预设值时，开关组合503串联连接发光二极管灯串子集组。在一些实施例中，预设值是电压值U2。
调节模块504产生发光二极管灯串子集组的驱动电流。在开关组合将发光二极管灯串子集于并联连接与串联连接之间作切换的期间，截断驱动电流。在一些实施例中，调节模块504包括多个调节器(REG 0 604、REG 1 605及REG 2 606)。对应的调节开关607、608、609连接至调节器（REG0 604、REG 1 605及REG 2 606）。可控制调节开关607、608及609打开或关闭特定的调节器以提供适当的发光二极管灯串电流值。如果将调节开关607、608及609全部关闭，可截断所有的驱动电流。
参考图4，一组发光二极管灯串经由调节开关607、608及609连接至调节器REG0 604、REG 1 605及REG 2 606。此组发光二极管灯串可分为第一子集601及第二子集602。第一子集601可包括多个LED单元灯串603。在此实施例中，所有于第一子集601中的LED单元灯串603并联连接。第二子集602可包括多数个发光二极管单元灯串603。
在第二子集602中，两串发光二极管单位灯串603串联连接，而反过来较长的发光二极管灯串并联连接。只要提供适当的开关加上正确的连接，任何可能的并联连接或串联连接皆可由开关组合实施。在一些实施例中，发光二极管灯串603的第三子集及第四子集可实施不同形式的并联连接或串联连接。在一些实施例中，调节开关607、608及609可实施于开关组合504之内。
在一些实施例中，当输入信号Uin于上升相位中且当输入信号Uin的电压值高于阈值电压Uth时，控制单元30截断驱动电流。在一些实施例中，开关组合503包括一组用来控制调节模块504的调节开关607、608及609，而控制单元30可借由断开此组调节开关607、608及609来截断驱动电流。
在一些实施例中，调节模块504更包括多个调节器604、605及606以提供驱动电流。在一些实施例中，输入电压侦测单元502是以一预设值来比较输入信号Uin的电压值的比较器。在一些实施例中，控制单元30更包括控制输入电压侦测单元502的逻辑电路505、开关组合503及调节模块504。
参考图1及图3，根据另一个实施例，发光二极管装置100包括一组发光二极管灯串21及22、整流模块10及控制单元30。整流模块10整流输入信号Uin。
控制单元30连接至整流模块10。控制单元30输出发光二极管灯串21、22的驱动电流。控制单元30在一期间内截断驱动电流。在截断驱动电流前，驱动电流具有第一电流值。在驱动电流从被截断至重新开启后，驱动电流具有第二电流值，而第一电流值不同于第二电流值。参考图2，在一些输入信号Uin于上升相位的实施例中，第一电流值是I1，第二电流值是I2。在输入信号Uin的下降相位中，第一电流值是I2，第二电流值是I1。
在一些实施例中，当输入信号Uin于上升相位中且当输入信号Uin的电压值高于阈值电压Uth时，控制单元30截断驱动电流。在一些实施例中，当输入信号Uin于上升相位中且当输入信号Uin的电压值高于总和电压时，控制单元30将驱动电流由截断至重新开启。总和电压至少是两倍的任一个发光二极管灯串之开启电压。在一些实施例中，总和电压是第二预设电压值U2。
在一些实施例中，当输入信号Uin于下降相位中且当输入电压的电压值低于总和电压时，控制单元30截断驱动电流。总和电压至少是两倍的任一个发光二极管灯串的开启电压。在一些实施例中，当输入信号Uin于下降相位中且当输入电压的电压值低于阈值电压Uth时，控制单元30将驱动电流由截断至重新开启。
图5说明调节器的三个示例。图6说明调节器的另三个示例。每一个图5及图6中的调节器可以是实施适当电流源的设计选择。每一个调节器皆具有当运用不同的电压和电流时，显示其特性之对应的I-V曲线。
由于本发明的发光二极管驱动电路不使用电解电容、电感及变压器，而是使用新设计的分段恒流集成电路，使得每个发光二极管灯串之间的串／并联关系可以灵活组合和切换，从而大大缩小了占用空间。驱动电路易于微型化且降低了成本。
由于电路中不存在电解电容，消除了由于电解电容过早失效而造成之整灯寿命缩短的隐患。发光二极管驱动电路因此可用于空间紧凑而对装置体积有较高需求的情况下，像是MR16和candle的场合。除此之外，发光二极管灯串的驱动电路在特定的周期被截断，使得由高电压差造成的集成电路热问题得以减少。发光二极管装置30更为省电。发光二极管装置30可避免当输入电压值及驱动电流皆高时的峰值发热。
以上仅为本发明较佳实施例而已，并不用以限制本发明，凡在本发明精神和原则之内，所做的任何修改、同等替换、改进等，均应包含在本发明保护的范围之内。

Claims (20)

  1. 一种发光二极管装置，其特征在于，包括：第一发光二极管灯串，所述第一发光二极管灯串具有第一开启电压；第二发光二极管灯串，所述第二发光二极管灯串具有第二开启电压；整流模块，供接收输入信号；以及控制单元，所述控制单元连接至第一发光二极管灯串及第二发光二极管灯串，所述控制单元连接至整流模组，所述控制单元输出一输出电流，所述输出电流包括一流经所述第一发光二极管灯串及所述第二发光二极管灯串的驱动电流；其中当所述输入信号介于一阈值电压及一总和电压时，所述控制单元截断所述驱动电流，所述总和电压至少是所述第一开启电压及所述第二开启电压总和，所述阈值电压大于所述第一开启电压。
  2. 如权利要求1所述的发光二极管装置，其特征在于，其中所述控制单元更包括一开关组合，当所述输入信号的一电压值高于一第一预设电压值且低于一第二预设电压值时，所述开关组合并联连接所述第一发光二极管灯串及所述第二发光二极管灯串，当所述输入信号的所述电压值高于所述第二预设电压值时，所述开关组合串联连接所述第一发光二极管灯串及所述第二发光二极管灯串。
  3. 如权利要求2所述的发光二极管装置，其特征在于，其中所述第一预设电压值大于所述第一开启电压及所述第二开启电压中的任何一个。
  4. 如权利要求2所述的发光二极管装置，其特征在于，其中所述第二预设电压值大于所述第一开启电压及第二开启电压的总和。
  5. 如权利要求2所述的发光二极管装置，其特征在于，其中所述开关组合包括第一开关、第二开关以及第三开关，当所述输入信号的所述电压值高于所述第一预设电压值且低于所述第二预设电压值时，所述第一开关连接，所述第二开关连接，且所述第三开关断开，使得所述第一发光二极管灯串及所述第二发光二极管灯串并联连接，且当所述输入信号的所述电压值高于所述第二预设电压值时，所述第一开关断开，所述第二开关断开，且所述第三开关连接，使得所述第一发光二极管灯串及所述第二发光二极管灯串串联连接。
  6. 如权利要求1所述的发光二极管装置，其特征在于，其中当所述输入信号的所述电压值低于所述第一开启电压及所述第二开启电压当中的任何一个时，无驱动电流流经所述第一发光二极管灯串及所述第二发光二极管灯串。
  7. 如权利要求1所述的发光二极管装置，其特征在于，其中所述控制单元更包括一调节模块，供产生一定电流给每一个所述第一发光二极管灯串及所述第二发光二极管灯串。
  8. 如权利要求1所述的发光二极管装置，其特征在于，其中所述整流模块是一桥式整流器。
  9. 如权利要求1所述的发光二极管装置，其特征在于，还包括一电阻，所述电阻连接于所述整流模块及所述控制单元之间。
  10. 一种控制单元，供控制发光二极管驱动电路，所述发光二极管驱动电路驱动多个发光二极管灯串，其特征在于，所述控制单元包括：输入电压侦测单元，所述输入电压侦测单元侦测一输入信号的电压值以产生侦测输出；开关组合，所述开关组合连接至所述输入电压侦测单元，当所述输入电压侦测单元判断所述输入信号的电压值低于一预设值时，所述开关组合并联连接所述发光二极管灯串，当所述输入电压侦测单元判断所述输入信号的电压值高于于所述预设值时，所述开关组合串联连接所述发光二极管灯串；以及调节模块，产生所述发光二极管灯串的一驱动电流，其中在所述开关组合将所述发光二极管灯串于并联连接与串联连接之间作切换的期间，截断所述驱动电流。
  11. 如权利要求10所述的控制单元，其特征在于，其中当所述输入信号于上升相位中且当所述输入信号的所述电压值高于一阈值电压时，所述控制单元截断所述驱动电流。
  12. 如权利要求10所述的控制单元，其特征在于，其中所述开关组合更包括用以控制所述调节模块的一组调节开关，所述控制单元借由断开所述条街开关以截断所述驱动电流。
  13. 如权利要求10所述的控制单元，其特征在于，其中所述调节模组更包括提供所述驱动电流的多个调节器。
  14. 如权利要求10所述的控制单元，其特征在于，其中所述输入电压侦测单元是一个比较器，用以比较所述输入信号的所述电压值及所述预设值。
  15. 如权利要求10所述的控制单元，其特征在于，其中还包括一逻辑电路，用以控制所述输入电压侦测单元、所述开关组合及所述调节模块。
  16. 一种发光二极管装置，其特征在于，所述发光二极管装置包括：一组发光二极管灯串；整流模组，用以整流输入信号；以及控制单元，所述控制单元连接至所述整流模组，所述控制单元产生所述一组发光二极管灯串的一驱动电流，所述控制单元在一段时间内截断所述驱动电流，其中在所述驱动电流被截断前，所述驱动电流具有第一电流值，在所述驱动电流从被截断至重新开启后所述驱动电流具有第二电流值，所述第一电流值不同于所述第二电流值。
  17. 如权利要求16所述的发光二极管装置，其特征在于，其中当所述输入信号于上升相位中且当所述输入信号的一电压值高于一阈值电压时，所述控制单元截断所述驱动电流。
  18. 如权利要求16所述的发光二极管装置，其特征在于，其中当所述输入信号于上升相位中且当所述输入信号的一电压值高于一总合电压时，所述控制单元将所述驱动电流由截断至重新开启，所述总和电压是至少两倍的任一个所述发光二极管灯串的一开启电压。
  19. 如权利要求16所述的发光二极管装置，其特征在于，其中当所述输入信号于下降相位中且当所述输入电压的一电压值低于一总和电压时，所述控制单元截断所述驱动电流，所述总和电压至少是两倍的任一个所述发光二极管灯串的一开启电压。
  20. 如权利要求16所述的发光二极管装置，其特征在于，其中当所述输入信号于下降相位中且当所述输入电压的一电压值低于一阈值电压时，所述控制单元将所述驱动电流由截断至重新开启。
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