CN112416105B - 一种多路tfx结构电源 - Google Patents

一种多路tfx结构电源 Download PDF

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CN112416105B
CN112416105B CN202110082613.4A CN202110082613A CN112416105B CN 112416105 B CN112416105 B CN 112416105B CN 202110082613 A CN202110082613 A CN 202110082613A CN 112416105 B CN112416105 B CN 112416105B
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CN112416105A (zh
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袁凌飞
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Beijing Zhongxin Lvjing Technology Co ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/30Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1252Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1257Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
    • 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
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • 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
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost 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
    • 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
    • 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
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal 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
    • 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

Abstract

本发明提出了一种多路TFX结构电源,包括:稳压电路控制部分、正负压驱动电路部分、整流电路部分和功率因素校正电路部分;多路TFX结构电源尺寸小巧,不但可应用于小机箱电脑内,同时能够提供稳定的正负12V,正负5V,3.3V电压输出,以适应国产CPU及主板的供电需求。

Description

一种多路TFX结构电源
技术领域
本发明涉及一种多路电源结构,具体涉及一种多路TFX结构电源。
背景技术
现有技术中Intel、AMD X86架构CPU以及配套的主板技术和工艺较先进,电脑配套电源无需一定使用多路电源(正负12V,正负5V,3.3V),主流一般使用TFX结构单路电源(仅12V输出),配套机箱也能做到体积小巧。TFX结构单路电源输出的12V供给X86架构电脑主板,再由主板转换成各路低电压供给其他设备。而对于信创项目中基于国产MIPS架构龙芯CPU、ARM架构飞腾CPU的小机箱电脑(15升机箱),ATX多路电源无法放入,又由于国产CPU电脑主板电源信号稳定性的原因而不能使用TFX单路12V电源。
发明内容
为了解决上述技术问题,本发明提出了一种多路TFX结构电源,包括:稳压电路控制部分、正负压驱动电路部分、整流电路部分和功率因素校正电路部分;
所述稳压电路控制部分,包括控制芯片、引脚保护元件、多个滤波电容、充电电容、比例反馈电阻、检流电阻、交流电源、基准电压、耦合器元件和供电电压,控制芯片控制稳压电路部分的供电电压输出正负电压±12V和±5V;比例反馈电阻使供电电压按照一定的比例进行反馈,检流电阻用于当电路电流过大时保护电路,交流电源为控制芯片提供电源;引脚保护元件用于保护引脚不被电压击穿;控制芯片的引脚一连接基准电压VREF,取两个输出电压12V和5V作为反馈电压,输出反馈电压经过耦合器元件,输入到控制芯片的引脚六,进而控制占空比;
所述正负压驱动电路部分,用于实现多路稳压,包括两个晶体管电子开关、变压器、两个继电器、两个整流器和两个电流抑制器;两个电流抑制器均由二极管和电阻并联构成,当继电器产生的反向电流通过电流抑制器时,电流抑制器呈开路状态,将电流切断,两个晶体管电子开关构成MOS管驱动,与变压器的次级的两端连接,它将220V的交流电降为合适的交流电后再经两个整流器转换成直流;
所述整流电路部分,包括整流桥、两个共模电感、金属氧化物压敏电阻器及聚合物正温度系数保护元件;共模电感二的端口二和端口四分别连接整流桥的左右两端,整流桥采用四个二极管桥式整流,共模电感二的端口一和端口三之间连接有串联的两个电容CY1和CY2,电容CY1和CY2串联后与电容CX2并联;共模电感一的端口一和端口三之间连接有并联的电容CX1和金属氧化物压敏电阻器,两个共模电感之间连接有聚合物正温度系数保护元件;
所述功率因素校正电路部分,采用boost电路实现,包括抗干扰器件、MOS器件、谐振电感和电容C1,抗干扰器件包括并联的二极管和电容C10、抗干扰器件连接谐振电感,抗干扰器件与谐振电感之间分支出MOS器件,电容C1和MOS器件Q8组成了半桥电路,对直流电压进行滤波。
进一步地,控制芯片的引脚三串联检流电阻,当引脚三的输入电压超过阈值时,控制芯片停止输出脉冲,从而截断电路。
进一步地,控制芯片的引脚九通过电阻的电压来判断交流输入电压是否降低到芯片不能正常工作的电压,当引脚九检测到电压低于阈值时,会触发控制芯片自动关机。
进一步地,电源具有过压保护:+5V输出过压点最大为7V,+12V输出过压点最大为15.6V,+3.3V输出过压点最大为5.1V。
进一步地,电源具有短路保护:+5V输出、+12V输出、+3.3V输出短路保护且锁死,需复位或市电重启才能开机。
进一步地,电源具有过功率保护:在输入电压230Vac,输出功率达到220~320W的情况下,主路输出会保护且锁死。
进一步地,电源在市电断开后,在掉出3.3伏或5伏电压范围之前,电压保持至少16毫秒不掉电。
进一步地,电源散热方式为强制风冷,电源根据温度来调节风扇转数。
本发明提供的TFX结构电源尺寸小巧,不但可应用于小机箱电脑内,同时能够提供稳定的正负12V,正负5V,3.3V电压输出,以适应国产CPU及主板的供电需求。
发明所到达的技术效果:
1、在市电断开后,PWR_OK保持至少16毫秒不掉电;保持时间能保护系统及时退出工作,不会崩溃。
2、在环境温度为25℃、75%负载状态下,平均无故障时间(MTBF)>10万小时。
3、具有过流保护、过压保护、短路保护和功率保护功能。
附图说明
附图1为多路TFX结构电源的稳压控制电路部分的电路图;
附图2为多路TFX结构电源的正负压驱动电路部分的电路图;
附图3为多路TFX结构电源的整流电路部分的电路图;
附图4为多路TFX结构电源的功率因素校正电路部分的电路图;
附图5为多路TFX结构电源的时序图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
多路TFX结构电源包括:稳压电路控制部分100、正负压驱动电路部分200、整流电路部分300和功率因素校正电路部分400。
参考附图1,稳压控制电路部分100,包括控制芯片IC4,引脚保护元件,多个滤波电容C3、C27、C7,充电电容C14,比例反馈电阻R18、R28,检流电阻R16、R47-R50,380V交流电源,基准电压VREF和供电电压Vcc等。
控制芯片IC4能够控制稳压电路部分100输出正负电压±12V和±5V,正负电压的输出可以采用三端固定式集成稳压器实现,也可以将三端可调式集成稳压器构成固定电压输出的电路实现。控制芯片IC4具有过电流保护功能,可以通过引脚三3来实现,在引脚三3的连接电路中串联一个检流电阻R16,当引脚三3的输入电压超过lV时,控制芯片IC4停止输出脉冲,从而截断电路,起到保护电路的作用。控制芯片IC4的引脚一1连接一个基准电压VREF,为了保证稳定输出直流电压,取两个输出电压12V和5V作为反馈电压。
引脚保护元件包括串联的电容C15和电阻R12及与其并联的电容C16;电路正常工作时,输出反馈电压经过耦合器元件,输入到控制芯片IC4的引脚六6,进而控制占空比,保持输出电压稳定。控制芯片IC4引脚七7、引脚六6分别经过R13、R14连接到基准电压VREF;控制芯片IC4的引脚九9通过电阻R19的电压来判断交流输入电压是否降低到芯片不能正常工作的电压。当引脚九9检测到电压低于1V时,会触发控制芯片自动关机。
电路正常工作时,控制芯片IC4需要一个最小为1.0mA的连续电流流入输出引脚,R47-50为限流电阻,当电路电流过大时,控制芯片IC4停止输出,以起到保护电路的作用,C14通常选为lOuF,作为控制芯片IC4的充电电容,为控制芯片IC4提供Vcc。
在优选实施例中,为了很好地改善控制芯片IC4输出端的交叉调整性能,可以通过检测多个输出电压来实现,多输出检测是通过电阻分压器的上臂用并联电阻实现电压检测,并联电阻的上端分别接到不同的输出端上,R18、R28是比例反馈电阻,使供电电压按照一定的比例进行反馈。
参考附图2,正负压驱动电路部分200,由于TFX结构电源体积小,仅为175*85*65mm,稳压电路需要正负压驱动电路部分200实现多路稳压,正负压驱动电路部分200包括晶体管电子开关Q11和Q12、变压器T2、继电器TR3和TR5C、整流器D18、 D19,电流抑制器D9、R35和D12、R37。
电流抑制器起过载自动保护作用,当继电器TR3和TR5C产生的反向电流通过电流抑制器时,电流抑制器呈开路状态,立即将电流切断,起到保护作用。一旦过流故障被排除时,电流抑制器又恢复成连通状态,即可在低压导通与高压断开之间相互转换而无须更换;
晶体管电子开关Q11和Q12构成MOS管驱动,其与变压器T2的次级的两端连接,它将220V的交流电降为合适的交流电后再经整流器D18、D19转换成直流。因要实现同时输出的正压和负压的稳压电源,故变压器T2的次级应带中心抽头。
变压器T2的保护采用可自恢复保险实现,额定工作电流为1A,过流则很瞬时断开,若故障解除,则30s内可自行恢复导电功能。
参考附图3,整流电路部分300,包括整流桥BD1、共模电感一LF1和共模电感二LF2、金属氧化物压敏电阻器MOV1及聚合物正温度系数保护元件RT1;
共模电感二LF2的端口二2和端口四4分别连接整流桥BD1的左右两端,整流桥BD1采用四个二极管桥式整流, 可以防止输入端电压波动,导致输出电压大于输入电压时引起稳压器损坏;
共模电感二LF2的端口一1和端口三3之间连接有串联的电容CY1和CY2,电容CY1和CY2串联后与电容CX2并联;
共模电感一LF1的端口一1和端口三3之间连接有并联的电容CX1和金属氧化物压敏电阻器MOV1,金属氧化物压敏电阻器MOV1为陶瓷元件,是由氧化锌微粒组成的多晶半导体过电压抑制器件,其能够将冲击电压限制在一定范围内,能承受较大的电流冲击,响应速度快;
共模电感一LF1和共模电感二LF2之间连接有聚合物正温度系数保护元件RT1,聚合物正温度系数保护元件RT1能在电流浪涌过大、温度过高时对电路起保护作用。在正常情况下,其阻值很小,损耗也很小,不影响电路正常工作;但若有过流(如短路)发生,其温度升高,它的阻值随之急剧升高,达到限制电流的作用,避免损坏电路中的元器件。当故障排除后,聚合物正温度系数保护元件RT1器件的温度自动下降,又恢复到低阻状态,因此选择聚合物正温度系数保护元件RT1是为了发挥它过流保护、自动复原双重功能。
参考附图4,功率因素校正电路部分400,功率因素校正电路采用boost电路实现,具体包括抗干扰器件、MOS器件Q8、谐振电感L1和充电电容C1,抗干扰器件包括并联的二极管D8和电容C10、抗干扰器件连接谐振电感L1,抗干扰器件与谐振电感L1之间分支出MOS器件Q8,电流一路经由抗干扰器件流进谐振电感L1,一路经由抗干扰器件流进MOS器件Q8,电容C1和MOS器件Q8组成了半桥电路,对直流电压进行滤波。C1通常选为lOuF,作为充电电容。
由上述四部分电路结构构成的多路TFX结构电源具有如下参数特性:
1、输入特征:输入电压范围最大为266.2V,最小为178.2V,通常介于
198-242V之间;正常输入频率为49 到51 赫兹;最大输入电流为4 安培;在输入电压范围浪涌电流低于关键器件的额定值,在电源满载和正常交流输入情况下能效最低为70%;待机时,正常输入电压下电源带载为+5VSb/0.3A,输入功率不超过3W;谐波电流符合IEC61000-3-2 class D 标准要求。
2、输出特征:稳态输出条件如下表1所示:
Figure 384899DEST_PATH_IMAGE001
交叉调整率如下表2所示:
Figure 629936DEST_PATH_IMAGE002
动态负载测试条件如下表3所示,动态负载测试条件下满足电压调整率要求;
电源能在规定的调节限值下通电和运行,直流输出端同时具有不同电容。
Figure DEST_PATH_IMAGE004
3、保护:
过压保护:+5V输出过压点最大7V,+12V输出过压点最大15.6V,+3.3V输出过压点最大5.1V;
短路保护:+5V输出、+12V输出、+3.3V输出短路保护且锁死,需PS_ON复位或市电重启才能开机。
过功率保护:在输入电压230Vac,输出功率达到220~320W的情况下,主路输出会保护且锁死。
4、时序:
如附图5所示,开机时间定义为从PS_ON置低电平到输出电压达到正常电压范围内,且时间小于500ms;输出电压需在20ms时间内从10%上升至正常电压范围内,且上升时间不小于0.1ms。从+3.3V和+5V输出电压达到正常范围起,电源需在100ms到500ms之间输出PWR_OK信号。PWR_OK信号上升时间(从电压10%到90%测量)小于10毫秒。在市电断开后,PWR_OK保持至少16毫秒不掉电,并应在+3.3伏或+5伏掉出其电压范围之前。在市电关机后,PWR_OK信号需在+5V或+3.3V电压掉出电压范围前掉电,且间隔时间不少于1毫秒。电源会提供一个表示电源正常的信号,即PWR_OK,来控制系统逻辑,在输出电压掉出范围会提前告警系统。PS_ON是一个低电压有效的+5V耐受TTL信号,允许主板远程控制电源。一旦向电源施加交流输入电压,电源内的内部上拉电阻器应提供TTL高输出逻辑电平。
5、5V辅助电源输出:
当电源输入额定工作范围内的电压时,PS_ON信号不会影响到+5V辅助电源输出。
6、散热与风速:
电源散热方式为强制风冷,电源可以根据温度来调节风扇转数。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。

Claims (6)

1.一种多路TFX结构电源,其特征在于,包括:稳压电路控制部分、正负压驱动电路部分、整流电路部分和功率因素校正电路部分;
所述稳压电路控制部分,包括控制芯片、引脚保护元件、多个滤波电容、充电电容、比例反馈电阻、检流电阻、交流电源、基准电压、耦合器元件和供电电压,控制芯片控制稳压电路部分的供电电压输出正负电压±12V和±5V;比例反馈电阻使供电电压按比例进行反馈,检流电阻用于当电路电流过大时保护电路,交流电源为控制芯片提供电源;引脚保护元件用于保护引脚不被电压击穿;控制芯片的引脚一连接基准电压VREF,取两个输出电压12V和5V作为反馈电压,输出反馈电压经过耦合器元件,输入到控制芯片的引脚六,进而控制占空比;控制芯片的引脚三串联检流电阻,当引脚三的输入电压超过阈值时,控制芯片停止输出脉冲,从而截断电路;控制芯片的引脚九通过电阻的电压来判断交流输入电压是否降低到芯片不能正常工作的电压,当引脚九检测到电压低于阈值时,会触发控制芯片自动关机;
所述正负压驱动电路部分,用于实现多路稳压,包括两个晶体管电子开关、变压器、两个继电器、两个整流器和两个电流抑制器;两个电流抑制器均由二极管和电阻并联构成,当继电器产生的反向电流通过电流抑制器时,电流抑制器呈开路状态,将电流切断,两个晶体管电子开关构成MOS管驱动,与变压器的次级的两端连接,它将220V的交流电降压后再经两个整流器转换成直流;
所述整流电路部分,包括整流桥、两个共模电感、金属氧化物压敏电阻器及聚合物正温度系数保护元件;共模电感二的端口二和端口四分别连接整流桥的左右两端,整流桥采用四个二极管桥式整流,共模电感二的端口一和端口三之间连接有串联的两个电容CY1和CY2,电容CY1和CY2串联后与电容CX2并联;共模电感一的端口一和端口三之间连接有并联的电容CX1和金属氧化物压敏电阻器,两个共模电感之间连接有聚合物正温度系数保护元件;
所述功率因素校正电路部分,采用boost电路实现,包括抗干扰器件、MOS器件、谐振电感和电容C1,抗干扰器件包括并联的二极管和电容C10、抗干扰器件连接谐振电感,抗干扰器件与谐振电感之间分支出MOS器件,电容C1和MOS器件Q8组成了半桥电路,对直流电压进行滤波。
2.权利要求1的多路TFX结构电源,其特征在于,电源具有过压保护:+5V输出过压点最大为7V,+12V输出过压点最大为15.6V,+3.3V输出过压点最大为5.1V。
3.权利要求1的多路TFX结构电源,其特征在于,电源具有短路保护:+5V输出、+12V输出、+3.3V输出短路保护且锁死,需复位或市电重启才能开机。
4.权利要求1的多路TFX结构电源,其特征在于,电源具有过功率保护:在输入电压230Vac,输出功率达到220~320W的情况下,主路输出会保护且锁死。
5.权利要求1的多路TFX结构电源,其特征在于,电源在市电断开后,在掉出3.3伏电压范围之前,电压保持至少16毫秒不掉电。
6.权利要求1的多路TFX结构电源,其特征在于,电源散热方式为强制风冷,电源根据温度来调节风扇转数。
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