WO2015192576A1 - 一种led驱动电源启动电路及启动方法 - Google Patents

一种led驱动电源启动电路及启动方法 Download PDF

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WO2015192576A1
WO2015192576A1 PCT/CN2014/089409 CN2014089409W WO2015192576A1 WO 2015192576 A1 WO2015192576 A1 WO 2015192576A1 CN 2014089409 W CN2014089409 W CN 2014089409W WO 2015192576 A1 WO2015192576 A1 WO 2015192576A1
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unit
factor correction
power factor
control signal
power source
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French (fr)
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张显伟
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Opple Lighting Co Ltd
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Opple Lighting Co Ltd
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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]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation

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  • the invention relates to the field of driving power sources, in particular to an LED driving power source starting circuit and a starting method.
  • the driving unit in the LED driving circuit such as the self-oscillation circuit and the power factor correction circuit
  • the driving unit in the LED driving circuit may have a problem of startup timing.
  • the startup time of the self-excited oscillation circuit is usually lower than 100mS; the power factor correction circuit is implemented by means of external resistor-capacitor charging, and there is a problem of delay.
  • the startup time is usually set at about 500mS. Therefore, at the moment of circuit startup, the power factor correction circuit operates significantly behind the self-oscillating circuit. This will cause the bus voltage to change at a low voltage during the start-up, causing a change in the output current, and the LED light source will flash bright and dark. At the same time, it can also cause the LED to be damaged by the impact of the peak current.
  • the invention discloses an LED driving power source starting circuit, comprising a driving unit and a power factor correcting unit; the power factor correcting unit is connected to the driving unit, and the LED driving power source starting circuit further comprises a delay unit connected to the Between the driving unit and the power factor correction unit; the power factor correction unit generates a control signal and sends to the delay unit; the delay unit Processing the control signal and generating a start signal to the driving unit; the driving unit starts after receiving the start signal.
  • the delay unit comprises a diode D1, a resistor R1, a resistor R2 and a capacitor C1.
  • the diode D1 is connected to the power factor correction unit for receiving the control signal; the resistor R2 is connected in parallel with the capacitor C1.
  • An RC circuit is formed; the resistor R1 is connected between the diode D1 and the RC circuit.
  • the power factor correction unit comprises: a capacitor C2, a controller and an auxiliary winding T1; the capacitor C2 is connected to an input end of the controller, and the auxiliary winding T1 is connected to a ZCD end of the controller; The power factor correction unit operates when the capacitor C2 is charged to a startup threshold of the controller.
  • the auxiliary winding T1 generates the control signal.
  • the power correction factor unit further includes a field effect transistor Q1; the FET Q1 is connected to the GD terminal of the controller; and the GD terminal generates the control signal.
  • control signal is a square wave signal.
  • the activation threshold is 12.5V.
  • the driving unit comprises: a self-oscillating circuit or a constant current type driving circuit.
  • the self-excited oscillation circuit comprises a switch tube Q2; the base of the switch tube Q2 is connected to the delay unit, the collector is connected to an external load, and the emitter is grounded.
  • the invention also discloses an LED driving power source starting method, comprising: starting a power factor correction unit; the power factor correction unit sends a control signal to a delay unit; the delay unit processes the control signal and sends a start Signaling to the drive unit; activating the drive unit.
  • the starting of the driving unit is limited by the startup of the power factor correction unit, and due to the action of the delay unit, the starting time of the driving unit is delayed, and the large current impact on the LED of the driving unit alone is avoided. .
  • FIG. 1 is a circuit diagram of a LED driving power source starting circuit in a first embodiment of the present invention
  • FIG. 2 is a circuit diagram of a LED driving power source starting circuit in a second embodiment of the present invention.
  • FIG. 3 is a block diagram of a method for starting an LED driving power supply according to the present invention.
  • the invention discloses an LED driving power source starting circuit, which comprises a driving unit and a power factor correcting unit. After the driving unit receives the start signal, it drives the LED to start the illumination. According to the current standard, when the LED power is greater than a certain value (such as 25w), there is a certain requirement on the power factor. Therefore, a power factor correction unit is added to the LED driving power source starting circuit, and is connected to the above driving unit to compensate for the power factor in the LED driving application with a power greater than a certain value.
  • the LED driving power source starting circuit further includes a delay unit connected between the driving unit and the power factor correcting unit for coordinating the starting timing between the driving unit and the power factor correcting unit.
  • a control signal is sent to the delay unit connected thereto, and the control signal is sent to start the driving unit; after receiving the control signal, the delay unit will process the control signal.
  • the processing described herein includes, but is not limited to, delaying the transmission of the signal, filtering the control signal, and the like.
  • the delay unit After the processing is completed, the delay unit generates a start signal and sends the start signal to the driving unit, and according to the start signal, the driving unit responds to start.
  • the control signal sent by the power factor correction unit is delayed by the delay unit, and the power factor correction unit has been normally started or is about to be normal within the time limit of processing the control signal.
  • the drive unit receives the start signal ready to start, so that the start sequence of the drive unit is after the power factor correction unit, that is, the power factor correction unit is not later than the drive unit starts and the peak current surge is avoided.
  • the delay unit comprises a diode D1, a resistor R1, a resistor R2 and a capacitor C1, wherein the anode of the diode D1 is connected to the power factor correction unit, more specifically to the signal output of the power factor correction unit.
  • the control signal sent by the power factor correction unit is sent to the diode D1.
  • the resistor R1 is connected to the cathode of the diode D1, and then the resistor R2 is connected in parallel with the capacitor C1 to form an RC circuit, and is connected to the resistor R1 such that the resistor R1 is connected between the diode D1 and the RC circuit.
  • the RC circuit filters the control signal received by the diode D1.
  • R1 is used to limit the charging current of C1
  • R2 is used to discharge C1.
  • the resistance of R1 determines the magnitude of the charging current; the charging current is large, the delay time is short, and the charging current is small, and the delay time is long.
  • the resistance of R2 determines the magnitude of the discharge current; the discharge current is large, the delay time is long, and the discharge current is small, and the delay time is short. Therefore, it can play a certain delay effect.
  • the selection of the delay unit is not limited to the solution in the foregoing embodiment.
  • the receiving and transmitting timing of the control signal controlled by the single chip connected between the driving unit and the power factor correcting unit can also achieve the above delay effect. .
  • the power factor correction unit comprises: a capacitor C2, a controller and an auxiliary winding T1.
  • the capacitor C2 is connected to an external power source for receiving power and slowly charging, and is connected to the input terminal Vcc of the controller. Power is forwarded to the controller.
  • the power factor correction unit will start to work only when the capacitor C2 is charged to the startup threshold of the controller. First, the power factor correction unit has a soft start effect.
  • the power factor correction circuit further includes a resistor R2 connected in parallel across the capacitor C2 for limiting the magnitude of the charging current of the capacitor C2 to form another RC circuit for filtering the processed signal, as described above. It can also play a certain delay effect.
  • the startup threshold is 12.5V.
  • the auxiliary winding T1 is connected to the capacitor C2 through a diode, wherein the diode rectifies the current input to the auxiliary winding T1, and the capacitor C2 is used for energy storage and filtering, and the stored energy can supply power to the controller, and then the auxiliary winding T1 is connected ZCD end of the controller (zero-crossing detection terminal), auxiliary winding T1 to the controller pulse control letter No.
  • the specific use mode can be adjusted according to the actual application.
  • the auxiliary winding T1 has different operating states in both embodiments.
  • 1 is a schematic circuit diagram of an LED driving power source starting circuit in a first embodiment of the present invention.
  • an auxiliary winding T1 is used for generating a control signal, which passes through an output terminal (A end in FIG. 1).
  • the external output control signal wherein the output is connected to the ZCD end of the controller and connected to the delay unit.
  • the output control signal is sent to the delay unit and processed by the delay unit.
  • 2 is a schematic circuit diagram of an LED driving power source starting circuit in a second embodiment of the present invention.
  • the auxiliary winding T1 is an application for supplying power to the controller.
  • the control signal is controlled by the controller.
  • the PFC chip is generated, and includes a effect transistor Q1 in the power factor correction unit, and one end of the FET Q1 is connected to the GD end (output end) of the controller, and the other end is connected to the current sampling resistor.
  • the control signal is controlled.
  • the output between the GD terminal of the device and the FET Q1 (B terminal in the figure) is sent to the delay unit.
  • control signal is a signal output by the auxiliary winding T1 or the output end of the controller, specifically a square wave signal.
  • the driving unit comprises a self-oscillating circuit comprising a switching transistor Q2, the base of which is connected to the delay unit, the collector is connected to the external load, and the emitter is grounded.
  • the self-oscillation circuit is an RCC self-oscillation circuit. After receiving the start signal from the delay unit, the switch Q2 is biased to start, thereby changing the start timing of the drive unit and the delay unit.
  • the self-oscillation circuit can also be provided with a plurality of resistors and capacitors to form an RC circuit, and the magnitude of the charge and discharge current of the capacitor is controlled by the resistor, so that each unit circuit in the LED driving power source startup circuit has a soft start. The function is to avoid the damage of the electronic components caused by the spike current.
  • the selection of the driving unit is not limited to the self-oscillation circuit, and other circuits different from the power factor correction unit startup timing such as the constant current type driving circuit can be used in this embodiment.
  • the present invention also discloses a method for starting an LED driving power source.
  • power The factor correction circuit is activated, and then it sends a control signal to a delay unit, and the delay unit performs filtering and delay processing on the control signal, and also has a delay effect.
  • the delay unit sends a start signal to the driving unit, and the driving unit starts to work only after the driving unit receives the start signal.
  • the starting of the driving unit is limited by the startup of the power factor correction unit, and due to the action of the delay unit, the starting time of the driving unit is delayed, and the large current impact on the LED of the driving unit alone is avoided. .

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  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明公开了一种LED驱动电源启动电路及启动方法，包括驱动单元及功率因数校正单元；所述功率因数校正单元与所述驱动单元连接，所述LED驱动电源启动电路还包括一时延单元，连接于所述驱动单元与功率因数校正单元间；所述功率因数校正单元产生一控制信号并发送至所述时延单元；所述时延单元处理所述控制信号，并产生一启动信号至所述驱动单元；所述驱动单元接收到所述启动信号后启动。采用上述技术方案后，可协调功率校正因数电路及驱动电路的启动时序。

Description

一种LED驱动电源启动电路及启动方法 技术领域
本发明涉及驱动电源领域，尤其涉及一种LED驱动电源启动电路及启动方法。
背景技术
在LED驱动领域，越来越多地使用了功率因数校正电路来增加LED驱动应用中的功率因数。但增加后，LED驱动电路中的驱动单元如自激震荡电路和功率因数校正电路两者结合时会存在启动时序的问题。自激震荡电路启动时间通常低于100mS；功率因数校正电路由于采用外接电阻电容充电的方式实现，存在延时的问题，考虑损耗，通常启动时间设在500mS左右。因此，在电路启动瞬间，功率因数校正电路工作明显滞后于自激震荡电路。这样会引起母线电压在启动瞬间产生电压低高变化，导致输出电流产生变化，LED光源产生明暗闪烁。同时，也会造成LED受到峰值电流的冲击而损坏。
因此，需要一种可协调功率因数校正电路及驱动电路的新型LED驱动电路，保护启动时的LED。
发明内容
本发明的目的在于提供一种LED驱动电源启动电路，只有在功率因数校正单元启动后驱动单元才会启动。
本发明公开了一种LED驱动电源启动电路，包括驱动单元及功率因数校正单元；所述功率因数校正单元与所述驱动单元连接，所述LED驱动电源启动电路还包括一时延单元，连接于所述驱动单元与功率因数校正单元间；所述功率因数校正单元产生一控制信号并发送至所述时延单元；所述时延单元 处理所述控制信号，并产生一启动信号至所述驱动单元；所述驱动单元接收到所述启动信号后启动。
优选地，所述时延单元包括二极管D1、电阻R1、电阻R2及电容C1，所述二极管D1与所述功率因数校正单元连接，用于接收所述控制信号；所述电阻R2与电容C1并联形成一RC电路；所述电阻R1连接在所述二极管D1与所述RC电路间。
优选地，所述功率因数校正单元包括：电容C2、控制器及辅助绕组T1；所述电容C2与所述控制器的输入端连接，所述辅助绕组T1与所述控制器的ZCD端连接；当所述电容C2充电至所述控制器的启动阈值时，所述功率因数校正单元工作。
优选地，所述辅助绕组T1产生所述控制信号。
优选地，所述功率校正因数单元还包括一场效应管Q1；所述场效应管Q1与所述控制器的GD端连接；所述GD端产生所述控制信号。
优选地，所述控制信号为方波信号。
优选地，所述启动阈值为12.5V。
优选地，所述驱动单元包括：自激振荡电路或恒流型驱动电路。
优选地，所述自激振荡电路包括开关管Q2；所述开关管Q2的基极与所述时延单元连接，集电极与外部负载连接，发射极接地。
本发明还公开了一种LED驱动电源启动方法，包括：启动功率因数校正单元；所述功率因数校正单元发送控制信号至一时延单元；所述时延单元处理所述控制信号，并发送一启动信号至驱动单元；启动所述驱动单元。
采用上述技术方案后，驱动单元的启动受限于功率因数校正单元的启动，且由于时延单元的作用，延后了驱动单元的启动时间，避免了驱动单元单独启动瞬间对LED的大电流冲击。
附图说明
图1为本发明第一实施例中LED驱动电源启动电路的电路示意图；
图2为本发明第二实施例中LED驱动电源启动电路的电路示意图；
图3为本发明LED驱动电源启动方法框图。
具体实施方式
以下结合附图与具体实施例进一步阐述本发明的优点。
本发明公开了一种LED驱动电源启动电路，包括了驱动单元及功率因数校正单元。驱动单元接收到启动信号后驱动LED启动照明，而根据目前的标准规定，当LED功率大于一定的值(如25w)时，对功率因数有一定的要求。因此，在LED驱动电源启动电路中增加有功率因数校正单元，与上述驱动单元连接，来对功率大于一定值的LED驱动应用中的功率因数进行补偿。为了达到上文提到的目的，LED驱动电源启动电路还包括有一时延单元，连接在驱动单元与功率因数校正单元间，用于协调驱动单元与功率因数校正单元间的启动时序。具体地，功率因数校正单元启动后将发送一控制信号至与其连接的时延单元，发送该控制信号的目的在于驱动单元启动；接收到该控制信号后，时延单元将对该控制信号进行处理，这里所述的处理包括但不限于延迟该信号的发送、对控制信号的滤波等。处理完毕后，时延单元将产生一启动信号，并将该启动信号发送至驱动单元，根据该启动信号，驱动单元响应启动。
从上述启动时序来看，功率因数校正单元先行启动后，其发出的控制信号经过时延单元的延时处理，对该控制信号处理的时限内，功率因数校正单元已正常启动完毕或是即将正常启动完毕，而后驱动单元才收到启动信号准备启动，使得驱动单元的启动顺序均后于功率因数校正单元，即达到功率因数校正单元不会晚于驱动单元启动并避免峰值电流冲击的效果。
一优选实施例中，时延单元包括二极管D1、电阻R1、电阻R2及电容C1，其中，二极管D1的正极与功率因数校正单元连接，更具体地，是与功率因数校正单元的信号输出端连接，使得功率因数校正单元发出的控制信号均发送至该二极管D1。电阻R1与二极管D1的负极连接，而后，电阻R2与电容C1并联形成一RC电路，并与电阻R1连接，使得电阻R1连接在二极管D1与该RC电路间。该RC电路对二极管D1接收到的控制信号进行滤波处理，具体工作原理为：R1用于限制C1的充电电流,R2用于对C1的放电。R1的阻值决定充电电流大小；充电电流大，延时时间短，反之充电电流小，延时时间长。R2的阻值则决定放电电流的大小；放电电流大，延时时间长，反之放电电流小，延时时间短。因此，可起到一定的延时效果。
当然，时延单元的选择并不限于上述实施例中的方案，例如，采用连接在驱动单元与功率因数校正单元间的单片机控制控制信号的接收及发送时序，同样可起到上述的延时效果。
可选地或优选地，功率因数校正单元包括有：电容C2、控制器及辅助绕组T1，电容C2与外部电源连接，用于接收电力并缓慢充电，其与控制器的输入端Vcc连接，将电力转发至控制器。具体工作时，外部交流电源AC输入后，整流后的电压给电容C2充电，由于采用了电容C2的配置，只有当电容C2充电至控制器的启动阈值时，功率因数校正单元才会开始工作，先行对功率因数校正单元起到了软启动的效果。同样地，功率因数校正电路还包括电阻R2，并联在电容C2两端，用于限制电容C2的充电电流的大小，形成另一RC电路，对处理后的信号进行滤波，同时，如上所述的，也可起到一定的延时效果。一实施例中，该启动阈值为12.5V。辅助绕组T1通过二极管与电容C2相连，其中，二极管为输入该辅助绕组T1的电流进行整流，电容C2为储能和滤波作用，其存储的能量可以为控制器提供电能，随后辅助绕组T1连接在控制器的ZCD端(过零检测端)，辅助绕组T1向控制器脉冲控制信 号，其具体使用方式可根据实际应用调节。
参阅图1及图2，两实施例中辅助绕组T1具有不同的工作状态。首先参阅图1，为本发明第一实施例中LED驱动电源启动电路的电路示意图，该实施例中辅助绕组T1为产生控制信号的应用，其通过一输出端(图1中为A端)向外输出控制信号，其中输出端与控制器的ZCD端连接，并与时延单元连接。将输出的控制信号发送至时延单元，由时延单元进行处理。继续参阅图2，为本发明第二实施例中LED驱动电源启动电路的电路示意图，该实施例中辅助绕组T1为向控制器提供电能的应用，在该实施例中，控制信号由控制器内的PFC芯片产生，在功率因数校正单元内还包括一场效应管Q1，该场效应管Q1一端与控制器的GD端(输出端)连接，另一端与电流采样电阻相连.控制信号则通过控制器的GD端与场效应管Q1间的输出端(图中为B端)发至时延单元。上述两实施例中产生控制信号的方式可根据实际情况替换，均可使用。
上述任一实施例中，控制信号为辅助绕组T1或控制器输出端输出的信号，具体为方波信号。
可选地或优选地，驱动单元包括有一自激振荡电路，该自激振荡电路包括一开关管Q2，其基极与时延单元连接，集电极则与外部负载连接，发射极接地。该自激振荡电路为RCC自激振荡电路，收到时延单元发来的启动信号后，开关管Q2偏置启动，从而起到改变驱动单元与时延单元的启动时序的目的。如上文所述，自激振荡电路中也可设置多个电阻与电容形成RC电路，由电阻控制电容的充放电的电流大小，使得该LED驱动电源启动电路中的每一单元电路均具有软启动的功能，避免了尖峰电流对电子元件的破坏。
上述实施例中，驱动单元的选择不仅限于自激振荡电路，其他与功率因数校正单元启动时序不同的电路如恒流型驱动电路均可使用在该实施例中。
参阅图3，本发明还公开了一种LED驱动电源的启动方法，首先，功率 因数校正电路启动，而后其发送一控制信号至一时延单元，交由时延单元对该控制信号进行滤波及延时处理，同时也可起到延时的效果。处理完毕后，时延单元发送启动信号至驱动单元，仅当驱动单元接收到该启动信号后，驱动单元启动工作。
采用上述技术方案后，驱动单元的启动受限于功率因数校正单元的启动，且由于时延单元的作用，延后了驱动单元的启动时间，避免了驱动单元单独启动瞬间对LED的大电流冲击。
应当注意的是，本发明的实施例有较佳的实施性，且并非对本发明作任何形式的限制，任何熟悉该领域的技术人员可能利用上述揭示的技术内容变更或修饰为等同的有效实施例，但凡未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何修改或等同变化及修饰，均仍属于本发明技术方案的范围内。

Claims (10)

  1. 一种LED驱动电源启动电路，包括驱动单元及功率因数校正单元；
    所述功率因数校正单元与所述驱动单元连接，其特征在于：
    所述LED驱动电源启动电路还包括一时延单元，连接于所述驱动单元与功率因数校正单元间；
    所述功率因数校正单元产生一控制信号并发送至所述时延单元；
    所述时延单元处理所述控制信号，并产生一启动信号至所述驱动单元；
    所述驱动单元接收到所述启动信号后启动。
  2. 如权利要求1所述的LED驱动电源启动电路，其特征在于：
    所述时延单元,包括二极管D1、电阻R1、电阻R2及电容C1，
    所述二极管D1与所述功率因数校正单元连接，用于接收所述控制信号；
    所述电阻R2与电容C1并联形成一RC电路；
    所述电阻R1连接在所述二极管D1与所述RC电路间。
  3. 如权利要求1所述的LED驱动电源启动电路，其特征在于：
    所述功率因数校正单元包括：电容C2、控制器及辅助绕组T1；
    所述电容C2与所述控制器的输入端连接，所述辅助绕组T1与所述控制器的ZCD端连接；
    当所述电容C2充电至所述控制器的启动阈值时，所述功率因数校正单 元工作。
  4. 如权利要求3所述的LED驱动电源启动电路，其特征在于：
    所述辅助绕组T1产生所述控制信号。
  5. 如权利要求3所述的LED驱动电源启动电路，其特征在于：
    所述功率校正因数单元还包括一场效应管Q1；
    所述场效应管Q1与所述控制器的GD端连接；
    所述GD端产生所述控制信号。
  6. 如权利要求3-5任一项所述的LED驱动电源启动电路，其特征在于：
    所述控制信号为方波信号。
  7. 如权利要求3-5任一项所述的LED驱动电源启动电路，其特征在于：
    所述启动阈值为12.5V。
  8. 如权利要求1所述的LED驱动电源启动电路，其特征在于：
    所述驱动单元包括：自激振荡电路或恒流型驱动电路。
  9. 如权利要求8所述的LED驱动电源启动电路，其特征在于：
    所述自激振荡电路包括开关管Q2；
    所述开关管Q2的基极与所述时延单元连接，集电极与外部负载连接，发射极接地。
  10. 一种LED驱动电源启动方法，包括：
    启动功率因数校正单元；
    所述功率因数校正单元发送控制信号至一时延单元；
    所述时延单元处理所述控制信号，并发送一启动信号至驱动单元；
    启动所述驱动单元。
PCT/CN2014/089409 2014-06-19 2014-10-24 一种led驱动电源启动电路及启动方法 Ceased WO2015192576A1 (zh)

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