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CN115664183B - 一种连续开关机无过冲电路 - Google Patents

一种连续开关机无过冲电路 Download PDF

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CN115664183B
CN115664183B CN202211455103.8A CN202211455103A CN115664183B CN 115664183 B CN115664183 B CN 115664183B CN 202211455103 A CN202211455103 A CN 202211455103A CN 115664183 B CN115664183 B CN 115664183B
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voltage
resistor
grounded
operational amplifier
optical coupler
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CN115664183A (zh
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胡和平
张鸿生
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Guangdong Dongling Power Technology Co ltd
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/32Pulse-control circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0009Devices or circuits for detecting current in a converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007Plural converter units in cascade
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/08Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/37Converter circuits
    • H05B45/3725Switched mode power supply [SMPS]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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

Abstract

一种连续开关机无过冲电路,包括输入端;分压电路;电压基准芯片U5,电压基准芯片U5与光耦U3连接,光耦U3还输入第一电压,光耦U3通过电阻R3接地,还连接在MOS管Q1的栅极上,还通过电阻R2输入第二电压;第二电压通过电阻R4连接在光耦U2上,其还连接在运放U4的输出端上,光耦U2的一端接地,一端通过电阻R1连接有驱动芯片U1;还包括第三电压,第三电压通过电阻R8以及充电电容C2接地,还连接在运放U4的正相端上,充电电容C2还通过MOS管Q1接地;灯具端通过采样电阻R_CS接地,还通过电阻R12连接在运放U4的负相端上。

Description

一种连续开关机无过冲电路
技术领域
本发明涉及LED领域,尤其涉及一种连续开关机无过冲电路。
背景技术
LED照明具有节能环保和寿命长的优点,相应LED电源也在不断发展变化,由于LED主要是通过恒流控制来工作的,如果其工作电流超过其限制最大电流,容易损伤LED,影响LED的寿命,而通常LED电源在连续开关机的时候其输出电流过冲较大,有些电流过冲超过50%,很容易损伤LED,影响LED的寿命。
发明内容
为解决上述问题,本技术方案提供一种连续开关机无过冲电路,采用本发明电路,电源在连续开关机的时候都是软启动,无电流过冲的问题,使LED不会受到损伤,连续开机冲击电流也更小,对电网污染少。
为实现上述目的,本技术方案如下:
一种连续开关机无过冲电路,包括;
输入端;
分压电路,其与所述输入端连接,并且在其输出端上设有电压基准芯片U5,所述电压基准芯片U5连接在光耦U3的发光端上,所述光耦U3的发光端还输入第一电压,所述光耦U3的导通端通过电阻R3接地,还连接在MOS管Q1的栅极上,另一导通端通过电阻R2输入第二电压,所述第二电压还用于为运放U4供电;
所述第二电压通过电阻R4连接在光耦U2的发光端上,其另一发光端连接在所述运放U4的输出端上,所述光耦U2的导通端接地,另一导通端通过电阻R1连接有驱动芯片U1;
还包括第三电压,所述第三电压通过电阻R8以及充电电容C2接地,还连接在所述运放U4的正相端上,所述充电电容C2还通过MOS管Q1接地;
灯具端通过采样电阻R_CS接地,还通过电阻R12连接在所述运放U4的负相端上。
在一些实施例中,所述运放U4的输出端通过电阻R11以及电容C1与负相端连接。
在一些实施例中,还包括连接在所述光耦U3的另一导通端上的稳压二极管ZD1。
在一些实施例中,还包括整流模块BD1,其与所述输入端连接。
在一些实施例中,所述分压电路包括与所述输入端连接的二极管D1以及二极管D2,其输出端设有电阻R9,所述电阻R9与所述电压基准芯片U5连接,还通过电阻R14以及电容C3接地。
本申请有益效果为:
采用上述发明专利,使产品在连续开关机时都进入软启动,不会出现电流过冲的现象,使LED不会受到损伤,连续开机冲击电流也更小,对电网污染少。
附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍。
图1是本发明实施例的结构示意图。
具体实施方式
为了使本发明所解决的技术问题、技术方案及有益效果更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。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。
请参照图1所示,一种连续开关机无过冲电路,包括;
输入端;
分压电路,其与所述输入端连接,并且在其输出端上设有电压基准芯片U5,所述电压基准芯片U5连接在光耦U3的发光端上,所述光耦U3的发光端还输入第一电压,所述光耦U3的导通端通过电阻R3接地,还连接在MOS管Q1的栅极上,另一导通端通过电阻R2输入第二电压,所述第二电压还用于为运放U4供电;
所述第二电压通过电阻R4连接在光耦U2的发光端上,其另一发光端连接在所述运放U4的输出端上,所述光耦U2的导通端接地,另一导通端通过电阻R1连接有驱动芯片U1;
还包括第三电压,所述第三电压通过电阻R8以及充电电容C2接地,还连接在所述运放U4的正相端上,所述充电电容C2还通过MOS管Q1接地;
灯具端通过采样电阻R_CS接地,还通过电阻R12连接在所述运放U4的负相端上。
请参考图1,R_CS电流检测电阻的电压通过R12连接到U4运放LM321的第3脚负向端,2.5V电压通过R8,C2,R6,R7,R5分压连接到U4运放LM321的第1脚正向端,当U4的第3脚电压大于U4的第1脚电压时,U4的4脚输出电压减小,从而光耦U2导通,控制U1驱动芯片来减小输出电流,使输出电流达到恒定,第一次启动时,C2两端的电压是缓慢上升,即经R5,R6,R7电阻分压到U4运放LM321的第1脚正向端的电流基准电压也是缓慢上升,从而使输出电流也是缓慢上升,实现软启动,本发明电路使在电源关机AC_L和AC_N输入电压小于50VAC时,经D1,D2,R9,R14,C3整流分压到U5的TL431的1脚电压迅速小于2.5V,使U5不导通,从而U3光耦导通,进而Q1 MOS管栅极电压大于开启电压,Q1导通,C2被快速放电到接近0V,从而使电源连续再次开机又重新实现软启动,输出电流不会过冲,使LED不会受到损伤,连续开机冲击电流也更小,对电网污染少。
在一些实施例中,所述运放U4的输出端通过电阻R11以及电容C1与负相端连接。
在一些实施例中,还包括连接在所述光耦U3的另一导通端上的稳压二极管ZD1。
在一些实施例中,还包括整流模块BD1,其与所述输入端连接。
在一些实施例中,所述分压电路包括与所述输入端连接的二极管D1以及二极管D2,其输出端设有电阻R9,所述电阻R9与所述电压基准芯片U5连接,还通过电阻R14以及电容C3接地。
以上所述仅为本申请的较佳实施例,并非用来限定本申请实施的范围,其他凡其原理和基本结构与本申请相同或近似的,均在本申请的保护范围之内。

Claims (4)

1.一种连续开关机无过冲电路,其特征在于,包括;
输入端;
分压电路,其与所述输入端连接,并且其输出端连接在电压基准芯片U5的参考极上,所述电压基准芯片U5的阴极连接在光耦U3的发光端阳极上,所述光耦U3的发光端阴极通过稳压二极管ZD1接地,所述电压基准芯片U5的阳极接地,所述光耦U3的发光端阳极还输入第一电压,所述光耦U3的导通端发射极通过电阻R3接地,该导通端发射极还连接在MOS管Q1的栅极上,导通端集电极通过电阻R2输入第二电压,所述第二电压还用于为运放U4供电,所述MOS管Q1的源极接地;
所述第二电压通过电阻R4连接在光耦U2的发光端阳极上,其发光端阴极连接在所述运放U4的输出端上,所述光耦U2的导通端发射极接地,导通端集电极通过电阻R1连接有驱动芯片U1;
还包括第三电压,所述第三电压通过电阻R8以及充电电容C2接地,还连接在所述运放U4的正相端上,所述充电电容C2一端与所述MOS管Q1的漏极连接,另一端接地;
灯具端通过采样电阻R_CS接地,还通过电阻R12连接在所述运放U4的负相端上。
2.根据权利要求1所述的一种连续开关机无过冲电路,其特征在于:所述运放U4的输出端通过电阻R11以及电容C1与负相端连接。
3.根据权利要求1所述的一种连续开关机无过冲电路,其特征在于:还包括整流模块BD1,其与所述输入端连接。
4.根据权利要求3所述的一种连续开关机无过冲电路,其特征在于:所述分压电路包括与所述输入端连接的二极管D1以及二极管D2,二极管D1以及二极管D2的输出端设有电阻R9,所述电阻R9与所述电压基准芯片U5的参考极连接,还通过电阻R14以及电容C3接地。
CN202211455103.8A 2022-11-21 2022-11-21 一种连续开关机无过冲电路 Active CN115664183B (zh)

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CN205693558U (zh) * 2016-05-24 2016-11-16 山东鲁能智能技术有限公司 一种输出过压保护电路及开关电源
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