WO2017128532A1 - 一种应用于固定负载的电源电路及led照明装置 - Google Patents

一种应用于固定负载的电源电路及led照明装置 Download PDF

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WO2017128532A1
WO2017128532A1 PCT/CN2016/079764 CN2016079764W WO2017128532A1 WO 2017128532 A1 WO2017128532 A1 WO 2017128532A1 CN 2016079764 W CN2016079764 W CN 2016079764W WO 2017128532 A1 WO2017128532 A1 WO 2017128532A1
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load
circuit
transformer
power supply
resistor
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PCT/CN2016/079764
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English (en)
French (fr)
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章宗星
王海勇
吴俊旺
唐波
黄冬青
侯潇
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深圳和而泰照明科技有限公司
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Publication of WO2017128532A1 publication Critical patent/WO2017128532A1/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

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  • the present invention relates to the field of power supplies, and more particularly to a power supply circuit and an LED lighting device applied to a fixed load.
  • LED fluorescent lamp Light Emitting Diode, LED
  • LED fluorescent lamp can save more than 80% of electricity, and its life span is more than 10 times that of ordinary lamp. It has high safety, strong heat dissipation, low light decay, and resistance to attack. It is almost maintenance-free. There is no need to change the lamp and inductor ballast frequently. The problem of the device and the starter can be exchanged for the cost saved in about half a year. LED lamps will enter thousands of households, and replacing traditional fluorescent lamps will be an inevitable trend.
  • the prior art LED power supply uses a RC capacitor, a chip switching power supply scheme, a chip constant current diode, and a chip high voltage IC chip scheme.
  • the existing technology has a short service life of the buck-boosting voltage, and is required to be capacitive, and has a disadvantage that the circuit power factor is low.
  • the main object of the present invention is to provide a power supply circuit and an LED lighting device for a fixed load, and to solve the technical problem of low power factor of a power supply output applied to a fixed load.
  • the present invention provides a power supply circuit for a fixed load, comprising:
  • the rectifier circuit, the filter circuit, the self-oscillation circuit and the load circuit are sequentially connected; the self-oscillation circuit is configured to input the filtered electric energy to the load circuit after self-oscillation and voltage and current adjustment.
  • the self-oscillating circuit comprises a transformer, a first resistor, a second resistor and a triode, the transformer comprising a first input end of the same name end, a first output end, and a second input end of the same name end, a second output end, the first resistor and the second resistor are arranged in series between the first output end of the transformer and the base of the three poles, and the emitter of the triode is grounded by a resistor, and the collector of the triode Connected to a second output of the transformer;
  • the input end of the transformer is connected to the first resistor and the second resistor connection line via a first capacitor; the output end of the filter circuit is connected to a connection line between the first resistor and the first output end of the transformer.
  • a first input end of the load is connected to a first output end of the transformer
  • a second input end of the load is connected to a second output end of the transformer via a rectifier diode
  • the rectifier diode is An anode is coupled to the second output of the transformer.
  • the first input end of the load is grounded, the second input end of the load is connected to the second output end of the transformer via a rectifier diode, and the anode of the rectifier diode and the second output of the transformer End connection.
  • a resistor and a capacitor are disposed in parallel between the first input end of the load and the second input end of the load.
  • the present invention also provides an LED lighting device comprising the power supply circuit applied to a fixed load according to any of the above.
  • the self-excited oscillation circuit is configured to self-oscillate the filtered electric energy and perform voltage and current adjustment input.
  • the power factor provided to the load circuit is high and the harmonic distortion is small.
  • the power supply circuit and the LED lighting device applied to the fixed load according to the embodiment of the present invention have The output power factor is high and the harmonic distortion is small.
  • FIG. 1 is a schematic structural view of a protection circuit of an LED light source according to a preferred embodiment of the present invention.
  • FIG. 1 is a schematic structural view of a power supply circuit applied to a fixed load according to a preferred embodiment of the present invention.
  • the power supply circuit applied to a fixed load includes: a rectifier circuit 10, a filter circuit 20, a self-oscillation circuit 30, and a load circuit 40 connected in sequence; the self-oscillation circuit 30 is configured to pass the filtered power through The oscillation is performed and the voltage and current are adjusted, and then input to the load circuit 40.
  • the rectifier circuit 10 and the filter circuit 20 may be provided as a conventional rectifier circuit.
  • the self-oscillation circuit 30 includes a transformer T1, a first resistor R1, a second resistor R2, and a transistor Q1.
  • the transformer T1 includes a first input terminal T10, a first output terminal T20, and a mutual
  • the second input terminal T11 and the second output terminal T21 of the same name are connected in series between the first output terminal T20 of the transformer T1 and the base B of the transistor Q1.
  • the emitter E of the transistor Q1 is grounded via a resistor, and the collector C of the transistor Q1 is connected to the second output terminal T21 of the transformer T1; the first input terminal 41 of the load circuit 40 and the second input terminal 42 of the load circuit 40
  • resistors and capacitors connected in parallel.
  • the first input terminal T10 of the transformer T1 is connected to the first resistor R1 and the second resistor R2 through a first capacitor C1; the output terminal 21 of the filter circuit 20 is connected to the first resistor R1 and the transformer The connection line of the first output terminal T10 of T1.
  • first input end 41 of the load circuit 40 is connected to the first output end T10 of the transformer T1, and the second input end 42 of the load circuit 40 passes through a rectifying diode D1 and a second output of the transformer T1.
  • the terminal T21 is connected, and the anode of the rectifier diode D is connected to the second output terminal T21 of the transformer T1.
  • the first input end of the load circuit may be grounded, the second input end of the load circuit is connected to the second output end of the transformer via a rectifier diode, and the rectifier diode The anode is connected to the second output of the transformer.
  • the working principle of the power supply circuit applied to the fixed load is as follows: the power supply circuit is subjected to the rectification circuit 10 and the filter circuit 20 to rectify the wave to obtain the pulsating DC, and the first resistor R1 for starting and the second resistor R2 are provided for the transistor Q1.
  • the base current, the transformer T1 senses the induced electromotive force of the first output terminal 8 of the transformer and the negative output of the second output terminal 7 of the transformer, and simultaneously induces the auxiliary input winding, the first input terminal T10 of the transformer is positive, and the second input terminal T11 of the transformer is negative.
  • the induced electromotive force further strengthens the conduction of the transistor Q1 through the first capacitor C1 (the first capacitor C1 is equivalent to the short circuit), and the transistor Q1 quickly enters the saturation conduction.
  • the first capacitor C1 As the first capacitor C1 is continuously charged, it is supplied to The base current of the transistor Q1 drops. When it falls to the saturation of the transistor Q1 and enters the amplification region, the collector current cannot increase linearly.
  • the induced electromotive force will be reversed to form a transformer first output terminal 8 negative, transformer
  • the second output terminal 7 is positively induced by the electromotive force, and the auxiliary winding forms a transformer.
  • the first input terminal T10 is negative, and the transformer is second.
  • the input terminal T11 is a positive induced electromotive force
  • the first input terminal T10 of the transformer is negative
  • the positive input electromotive force of the second input terminal T11 of the transformer further aggravates the triode Q1 to be turned off, and the first capacitor C1 is discharged.
  • the transistor T1 after the triode Q1 is turned off The stored energy is released. The above cycle is repeated when the energy release is completed.
  • the parameters of the first resistor R1, the second resistor R2, the transformer T1, and the first capacitor C1 can be generally adjusted to obtain a current required by the load, and the load circuit is The power supply factor of 40 is higher and the harmonic distortion is small.
  • the self-excited oscillation circuit 30 is provided for self-oscillation and voltage and current adjustment.
  • the latter is input to the load circuit 40 such that the power factor provided to the load circuit 40 is high and the harmonic distortion is small.
  • the present invention also provides an LED lighting device comprising the above-described power supply circuit applied to a fixed load.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

本发明提供一种应用于固定负载的电源电路及LED照明装置，应用于固定负载的电源电路包括依次连接的整流电路、滤波电路、自激振荡电路和负载电路；所述自激振荡电路用于将滤波后的电能经自激振荡且进行电压和电流调节后输入至负载电路。本发明实施例的应用于固定负载的电源电路及LED照明装置具有输出功率因素高且谐波失真小的优点。

Description

一种应用于固定负载的电源电路及LED照明装置 技术领域
本发明涉及电源领域，尤其涉及一种应用于固定负载的电源电路及LED照明装置。
背景技术
当前绿色能源，节能环保，低碳生活是当今时代人们谈论最多的话题。这是对科学技术发展的实际检验，同时也反映了人们对新生活更高品质的要求。当太阳能、风能都被作为绿色能源推广的时候，LED(Light Emitting Diode,LED)产品也以节能环保新能源跻身于广大市场。其中占主导的还是LED日光灯。LED日光灯节电高达80％以上，寿命为普通灯管的10倍以上，安全度高，散热性强，光衰低，耐抗击，几乎是免维护，不存在要经常更换灯管、电感镇流器、启辉器的问题，约半年下来节省的费用就可以换回成本。LED灯管走进千家万户，替换传统荧光灯将是一种必然趋势。
然而，现有技术的LED电源使用阻容降压，使用芯片开关电源方案，芯片恒流二极管，以及芯片高压IC等芯片方案。现有的技术阻容降压的使用寿命短，并且对电容要求苛刻，存在电路功率因素值低的缺点。
如何设计出一种使用寿命长且输出功率因素值高的电源电路为业界亟需解决的课题。
发明内容
本发明的主要目的在于提供种应用于固定负载的电源电路及LED照明装置，旨在解决应用于固定负载的供电电源输出的功率因素低的技术问题。
为实现上述目的，本发明提供一种应用于固定负载的电源电路，其包括：
依次连接的整流电路、滤波电路、自激振荡电路和负载电路；所述自激振荡电路用于将滤波后的电能经自激振荡且进行电压和电流调节后输入至负载电路。
优选地，所述自激振荡电路包括变压器、第一电阻、第二电阻和三极管，所述变压器包括互为同名端的第一输入端、第一输出端，以及互为同名端的第二输入端、第二输出端，所述第一电阻、第二电阻串联设置在所述变压器的第一输出端与三极这的基极之间，所述三极管的发射极以一电阻接地，三极管的集电极与变压器的第二输出端连接；
所述变压器的输入端经第一电容连接至所述第一电阻和第二电阻连接线上；所述滤波电路输出端连接在所述第一电阻与变压器第一输出端的连接线上。
优选地，，所述负载的第一输入端与所述变压器的第一输出端连接，负载的第二输入端经一整流二极管与所述变压器的第二输出端连接，且所述整流二极管的阳极与所述变压器的第二输出端连接。
优选地，，所述负载的第一输入端接地，负载的第二输入端经一整流二极管与所述变压器的第二输出端连接，且所述整流二极管的阳极与所述变压器的第二输出端连接。
优选地，，所述负载的第一输入端，负载的第二输入端之间并联设置有电阻和电容。
本发明还提供一种LED照明装置，其包括上述任一项所述的应用于固定负载的电源电路。
相较于现有技术，本发明实施例的应用于固定负载的电源电路及LED照明装置中，通过设置自激振荡电路用于将滤波后的电能经自激振荡且进行电压和电流调节后输入至负载电路，使得对负载电路提供的功率因素高且谐波失真小。
因此，本发明实施例的应用于固定负载的电源电路及LED照明装置具有 输出功率因素高且谐波失真小的优点。
附图说明
图1是本发明一优先实施例的LED光源的保护电路的结构示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
参照图1，图1是本发明一优先实施例的应用于固定负载的电源电路的结构示意图。
所述应用于固定负载的电源电路,其包括：依次连接的整流电路10、滤波电路20、自激振荡电路30和负载电路40；所述自激振荡电路30用于将滤波后的电能经自激振荡且进行电压和电流调节后输入至负载电路40。所述整流电路10和滤波电路20可设置为常规的整流电路即可。
具体地，所述自激振荡电路30包括变压器T1、第一电阻R1、第二电阻R2和三极管Q1，所述变压器T1包括互为同名端的第一输入端T10、第一输出端T20，以及互为同名端的第二输入端T11、第二输出端T21，所述第一电阻R1、第二电阻R2串联设置在所述变压器T1的第一输出端T20与三极管Q1的基极B之间，所述三极管Q1的发射极E经一电阻接地，三极管Q1的集电极C与变压器T1的第二输出端T21连接；所述负载电路40的第一输入端41，负载电路40的第二输入端42之间并联设置有电阻和电容.
所述变压器T1的第一输入端T10经第一电容C1连接至所述第一电阻R1和第二电阻R2连接线上；所述滤波电路20输出端21连接在所述第一电阻R1与变压器T1第一输出端T10的连接线上。
进一步的，所述负载电路40的第一输入端41与所述变压器T1的第一输出端T10连接，负载电路40的第二输入端42经一整流二极管D1与所述变压器T1的第二输出端T21连接，且所述整流二极管D的阳极与所述变压器T1的第二输出端T21连接。
进一步的，在其它实施例中，还可以将所述负载电路的第一输入端接地，负载电路的第二输入端经一整流二极管与所述变压器的第二输出端连接，且所述整流二极管的阳极与所述变压器的第二输出端连接。
上述应用于固定负载的电源电路的工作原理：供电电路经过前面的整流电路10、滤波电路20整流虑波得到脉动直流，通过用于启动的电阻第一电阻R1,第二电阻R2给三极管Q1提供基极电流，变压器T1感应一个变压器第一输出端8正、变压器第二输出端7负的感应电动势，同时感应到辅助绕组一个变压器第一输入端T10为正，变压器第二输入端T11为负的感应电动势，此电动势通过第一电容C1(刚开始第一电容C1相当于短路)进一步加强三极管Q1导通，三极管Q1很快进入饱和导通.随着第一电容C1不断充电，提供给到三极管Q1的基极电流下降.当下降到不能维持三极管Q1饱和导通而进入放大区，集射电流不能线性增加，此时感应电动势将发生翻转，形成一个变压器第一输出端8负、变压器第二输出端7正的感应电动势，辅助绕组形成一个变压器第一输入端T10为负，变压器第二输入端T11为正的感应电动势，变压器第一输入端T10为负，变压器第二输入端T11为正的感应电动势进一步加剧三极管Q1关断，第一电容C1进行放电.三极管Q1关断后变压器T1储存的能量释放出来.当能量释放完成又重复以上的周期。
本发明的实施例中，在负载电路40的负载固定时，通常可以调节第一电阻R1、第二电阻R2、变压器T1以及第一电容C1的参数即可得到负载需要的电流，且对负载电路40的供电功率因素值较高，且谐波失真小。
相较于现有技术，本发明实施例的应用于固定负载的电源电路中，通过设置自激振荡电路30用于将滤波后的电能经自激振荡且进行电压和电流调节 后输入至负载电路40，使得对负载电路40提供的功率因素高且谐波失真小。
本发明还提供一种LED照明装置，其包括上述的应用于固定负载的电源电路。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (6)

  1. 一种应用于固定负载的电源电路，其特征在于，其包括：
    依次连接的整流电路、滤波电路、自激振荡电路和负载电路；所述自激振荡电路用于将滤波后的电能经自激振荡且进行电压和电流调节后输入至负载电路。
  2. 根据权利要求1所述的应用于固定负载的电源电路，其特征在于，所述自激振荡电路包括变压器、第一电阻、第二电阻和三极管，所述变压器包括互为同名端的第一输入端、第一输出端，以及互为同名端的第二输入端、第二输出端，所述第一电阻、第二电阻串联设置在所述变压器的第一输出端与三极这的基极之间，所述三极管的发射极以一电阻接地，三极管的集电极与变压器的第二输出端连接；
    所述变压器的输入端经第一电容连接至所述第一电阻和第二电阻连接线上；所述滤波电路输出端连接在所述第一电阻与变压器第一输出端的连接线上。
  3. 根据权利要求2所述的应用于固定负载的电源电路，其特征在于，所述负载的第一输入端与所述变压器的第一输出端连接，负载的第二输入端经一整流二极管与所述变压器的第二输出端连接，且所述整流二极管的阳极与所述变压器的第二输出端连接。
  4. 根据权利要求2所述的应用于固定负载的电源电路，其特征在于，所述负载的第一输入端接地，负载的第二输入端经一整流二极管与所述变压器的第二输出端连接，且所述整流二极管的阳极与所述变压器的第二输出端连接。
  5. 根据权利要求1所述的应用于固定负载的电源电路，其特征在于，所述负载的第一输入端，负载的第二输入端之间并联设置有电阻和电容。
  6. 一种LED照明装置，其包括上述权利要求1至5中任一项所述的应用 于固定负载的电源电路。
PCT/CN2016/079764 2016-01-29 2016-04-20 一种应用于固定负载的电源电路及led照明装置 WO2017128532A1 (zh)

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