CN115208201A - 反激式电源转换器的操作方法 - Google Patents
反激式电源转换器的操作方法 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies 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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Abstract
本发明公开了一种反激式电源转换器的操作方法。所述操作方法包含一电压检测引脚检测所述反激式电源转换器的一次侧的功率开关的导通时间,一回授引脚检测所述反激式电源转换器的二次侧的同步开关的导通时间,所述回授引脚检测所述反激式电源转换器操作于一非连续导通模式时的电感电容谐振波谷数,以及一高压检测引脚检测输入至所述反激式电源转换器的输入电压;及当所述电感电容谐振波谷数大于一预定数、所述反激式电源转换器的操作频率小于一预定频率和所述输入电压小于一预定电压时,应用于所述反激式电源转换器的控制器使所述反激式电源转换器操作在一准谐振模式。因此,相较于现有技术,本发明可使所述反激式电源转换器的效率较佳。
Description
技术领域
本发明涉及一种反激式电源转换器的操作方法,尤其涉及一种可控制反激式电源转换器在准谐振模式(quasi-resonant mode)和零电压切换模式(zero voltageswitching mode)之间切换以使所述反激式电源转换器的效率较佳的操作方法。
背景技术
在现有技术中,当反激式电源转换器被设计操作在零电压切换模式时,所述反激式电源转换器具有其一次侧的功率开关的切换损失趋近于零的优点。虽然所述反激式电源转换器具有所述功率开关的切换损失趋近于零的优点,但当输入至所述反激式电源转换器的输入电压低于预定电压或耦接于所述反激式电源转换器的二次侧的负载是轻载时,操作在所述零电压切换模式下的所述反激式电源转换器的效率反而变差。此时如果使所述反激式电源转换器操作在准谐振模式(quasi-resonant mode),则所述反激式电源转换器的效率会变佳。因为所述反激式电源转换器无法根据所述输入电压和所述负载决定操作在所述零电压切换模式或所述准谐振模式,所以所述反激式电源转换器的效率不一定是最佳。因此,如何设计一个可根据所述输入电压和所述负载决定操作在所述零电压切换模式或所述准谐振模式的反激式电源转换器已成为一项重要课题。
发明内容
本发明的一实施例公开一种反激式电源转换器(flyback power converter)的操作方法。所述操作方法包含一电压检测引脚检测所述反激式电源转换器的一次侧的功率开关的导通时间,一回授引脚检测所述反激式电源转换器的二次侧的同步开关的导通时间,所述回授引脚检测所述反激式电源转换器操作于一非连续导通模式(discontinuousconduction mode,DCM)时的电感电容谐振波谷数,以及一高压检测引脚检测输入至所述反激式电源转换器的输入电压;及当所述电感电容谐振波谷数大于一预定数、所述反激式电源转换器的操作频率小于一预定频率和所述输入电压小于一预定电压时,应用于所述反激式电源转换器的控制器使所述反激式电源转换器操作在一准谐振模式(quasi-resonantmode)。
本发明公开一种反激式电源转换器的操作方法。所述操作方法是根据一初级控制器的电压检测引脚检测所述反激式电源转换器的一次侧的功率开关的导通时间,所述初级控制器的回授引脚检测所述反激式电源转换器的二次侧的同步开关的导通时间,所述初级控制器的回授引脚检测所述反激式电源转换器操作于一非连续导通模式时的电感电容谐振波谷数,以及所述初级控制器的高压检测引脚检测输入至所述反激式电源转换器的输入电压,控制所述反激式电源转换器在一准谐振模式和一零电压切换模式之间切换。因此,相较于现有技术,因为本发明可控制所述反激式电源转换器在所述准谐振模式和所述零电压切换模式之间切换,所以本发明可使所述反激式电源转换器的效率较佳。
附图说明
图1是本发明的第一实施例所公开的一种反激式电源转换器(flyback powerconverter)的操作方法的流程图。
图2是说明反激式电源转换器、初级控制器和次级控制器的示意图。
图3-7是说明反激式电源转换器操作在所述零电压切换模式的示意图。
图8是说明当反激式电源转换器操作不同的操作频率时,反激式电源转换器对应所述零电压切换模式的损耗相对于反激式电源转换器对应所述准谐振模式的损耗的示意图。
图9是说明当反激式电源转换器操作不同的输入电压时,反激式电源转换器对应所述零电压切换模式的损耗相对于反激式电源转换器对应所述准谐振模式的损耗的示意图。
图10是说明反激式电源转换器和初级控制器的示意图。
其中,附图标记说明如下:
200 反激式电源转换器
202 初级控制器
204 次级控制器
206 功率开关
208 同步开关
210 一次侧绕组
212 二次侧绕组
214 传递电路
1000 主动箝位反激式电源转换器
1002 光耦合器
1004 开关
1006 箝位电容
FSW 操作频率
GND1、GND2 地电平
IDSSR、IDSSW 电流
PRI 一次侧
PF 预定频率
PV 预定电压
PQR、PZVS 损耗
SEC 二次侧
T0-T4 时间
VGSSW、VGSSR 栅极控制信号
VDSSW、VDSSR 跨压
VIN 输入电压
VOUT 输出电压
具体实施方式
请参照图1,图1是本发明的第一实施例所公开的一种反激式电源转换器(flybackpower converter)的操作方法的流程图,其中图1的操作方法是利用图2的反激式电源转换器200、初级控制器202和次级控制器204说明,详细步骤如下:
步骤100:开始;
步骤102:初级控制器202的电压检测引脚检测反激式电源转换器200的一次侧PRI的功率开关206的导通时间TON,初级控制器202的回授引脚检测反激式电源转换器200的二次侧SEC的同步开关208的导通时间TDIS,初级控制器202的回授引脚检测反激式电源转换器200操作于一非连续导通模式(discontinuous conduction mode,DCM)时的电感电容谐振波谷数LCRVN,以及初级控制器202的高压检测引脚检测输入至反激式电源转换器200的输入电压VIN;
步骤104:电感电容谐振波谷数LCRVN是否大于一预定数,如果是,进行步骤106;如果否,跳至步骤112;
步骤106:反激式电源转换器200的操作频率是否小于一预定频率PF,如果是,进行步骤108;如果否,跳至步骤112;
步骤108:输入电压VIN是否小于一预定电压PV,如果是,进行步骤110;如果否,跳至步骤112;
步骤110:初级控制器202使反激式电源转换器200操作在一准谐振模式(quasi-resonant mode),跳回步骤102;
步骤112:初级控制器202使反激式电源转换器200操作在一零电压切换模式(zerovoltage switching mode),跳回步骤102。
在说明图1的操作方法之前,请先参照图3-9,其中图3-7是说明反激式电源转换器200操作在所述零电压切换模式的示意图,图8是说明当反激式电源转换器200操作不同的操作频率时,反激式电源转换器200对应所述零电压切换模式的损耗PZVS相对于反激式电源转换器200对应所述准谐振模式的损耗PQR的示意图,以及图9是说明当反激式电源转换器200操作不同的输入电压时,反激式电源转换器200对应所述零电压切换模式的损耗PZVS相对于反激式电源转换器200对应所述准谐振模式的损耗PQR的示意图。另外,如图2所示,反激式电源转换器200是一二次侧调节(secondary side regulation)反激式电源转换器,反激式电源转换器200的一次侧绕组210和反激式电源转换器200的二次侧绕组212的匝数比为N,N为一实数,初级控制器202和次级控制器204通过一传递电路214沟通,传递电路214将反激式电源转换器200的一次侧PRI与反激式电源转换器200的二次侧SEC隔开,以及反激式电源转换器200的一次侧PRI的地电平GND1与反激式电源转换器200的二次侧SEC的地电平GND2不可相同。另外,初级控制器202具有6引脚(未绘示于图2),其中所述6引脚包含所述电压检测引脚、所述回授引脚、所述高压检测引脚、一供电电压引脚、一栅极控制信号引脚和一接地引脚,所述供电电压引脚是用以接收一供电电压,以及所述栅极控制信号引脚是用以输出初级控制器202所产生的栅极控制信号至功率开关206。
如图3、4所示,在一时间T0和一时间T1之间,因为次级控制器204启动一栅极控制信号VGSSR给同步开关208,所以同步开关208的跨压VDSSR为零,其中反激式电源转换器200的二次侧SEC的电流IDSSR的方向请参照图3。另外,因为反激式电源转换器200的一次侧PRI与反激式电源转换器200的二次侧SEC不会同时操作,所以此时初级控制器202关闭给功率开关206的栅极控制信号VGSSW且反激式电源转换器200的一次侧PRI的电流IDSSW为零,其中功率开关206的跨压VDSSW是由式(1)决定:
VDSSW=VIN+N*(VOUT) (1)
其中如式(1)所示,VOUT为反激式电源转换器200的二次侧SEC的输出电压。另外,在时间T0和时间T1之间,反激式电源转换器200可将反激式电源转换器200的一次侧绕组210上的能量传递至反激式电源转换器200的二次侧SEC。
如图4、5所示,在时间T1和一时间T2之间,虽然初级控制器202没有启动栅极控制信号VGSSW给功率开关206,但此时一次侧PRI的电流IDSSW可流经功率开关206的寄生二极体(未绘示于图5),所以功率开关206的跨压VDSSW逐渐降为零以及同步开关208的跨压VDSSR开始逐渐增加直至(VIN/N)+VOUT,其中一次侧PRI的电流IDSSW的方向请参照图5。另外,如图4、5所示,在时间T1和时间T2之间,反激式电源转换器200可将反激式电源转换器200的一次侧绕组210上的能量回收至耦接反激式电源转换器200的一次侧PRI的一接地电容(未绘示于图5)。
如图4、6所示,在时间T2和一时间T3之间,初级控制器202启动栅极控制信号VGSSW给功率开关206,此时一次侧PRI的电流IDSSW可流经功率开关206,所以功率开关206的跨压VDSSW为零以及同步开关208的跨压VDSSR为(VIN/N)+VOUT,其中一次侧PRI的电流IDSSW的方向请参照图6。另外,因为反激式电源转换器200的一次侧PRI与反激式电源转换器200的二次侧SEC不会同时操作,所以此时次级控制器204关闭给同步开关208的栅极控制信号栅极控制信号VGSSR。另外,在时间T2和时间T3之间,反激式电源转换器200可将反激式电源转换器200的一次侧绕组210上的能量传递至反激式电源转换器200的二次侧绕组212。
如图4、7所示,在时间T3和一时间T4之间,次级控制器204启动一栅极控制信号VGSSR给同步开关208,此时二次侧SEC的电流IDSSR可流经同步开关208,所以同步开关208的跨压VDSSR为零以及功率开关206的跨压VDSSW为VIN+(N*VOUT),其中二次侧SEC的电流IDSSR的方向请参照图7。另外,因为反激式电源转换器200的一次侧PRI与反激式电源转换器200的二次侧SEC不会同时操作,所以此时初级控制器202关闭栅极控制信号VGSSW。另外,在时间T3和时间T4之间,反激式电源转换器200可将反激式电源转换器200的二次侧绕组212上的能量传递至耦接于反激式电源转换器200的二次侧SEC的负载(未绘示于图7)。
另外,功率开关206的切换损耗(switching loss)PSW和传导损耗(conductionloss)PCON分别由式(2)和式(3)决定:
PCON=RDSSW(ON)×IDSSW(RMS)2 (3)
如式(2)所示,COSS为功率开关206的寄生电容,跨压VDSSW在所述准谐振模式时为VINMAX-N*(VOUT+VF),VINMAX为输入电压VIN的最大值,VF为同步开关208的寄生二极体的跨压,跨压VDSSW在所述零电压切换模式时为零,以及FSW为反激式电源转换器200的操作频率。另外,因为跨压VDSSW在所述零电压切换模式时为零,所以由式(2)可知,功率开关206的切换损耗PSW在所述零电压切换模式时为零。另外,如式(3)所示,RDSSW为功率开关206的导通电阻,以及IDSSW(RMS)为一次侧PRI的电流IDSSW的有效值。
另外,同步开关208在所述零电压切换模式时的切换损耗(switching loss)PSWSRAUX和传导损耗(conduction loss)PCONSRAUX分别由式(4)和式(5)决定:
如式(4)所示,COSSSR为同步开关208的寄生电容,跨压VDSSR介于0~2*VOUT。另外,如式(5)所示,RDSSR(ON)为同步开关208的导通电阻,IDSSRMAX为二次侧SEC的电流IDSSR的最大值,以及DAUX为同步开关208的导通时间。
如图8所示,在输入电压VIN为264V以及操作频率FSW介于20kHz~100kHz的条件下,可根据式(2)~式(5)计算出反激式电源转换器200在所述零电压切换模式时的损耗PZVS和反激式电源转换器200在所述准谐振模式时的损耗PQR,其中当反激式电源转换器200的操作频率FSW大于预定频率PF(例如25kHz)时,反激式电源转换器200应操作在所述零电压切换模式以使反激式电源转换器200的效率较佳。
如图9所示,在输入电压VIN大于预定电压PV(例如150V)后,反激式电源转换器200在所述零电压切换模式时的损耗PZVS将小于反激式电源转换器200在所述准谐振模式时的损耗PQR。因此,当输入电压VIN大于预定电压PV后,反激式电源转换器200应操作在所述零电压切换模式以使反激式电源转换器200的效率较佳。
在步骤104中,如果电感电容谐振波谷数LCRVN大于所述预定数时,则意味着耦接于反激式电源转换器200的二次侧SEC的负载是一轻载。在步骤106中,初级控制器202可根据导通时间TON、导通时间TDIS和对应电感电容谐振波谷数LCRVN的电感电容谐振时间,得出反激式电源转换器200的操作频率。因此,在步骤104至步骤108中,由图8、9很明显地可知,当电感电容谐振波谷数LCRVN大于所述预定数,所述操作频率小于预定频率PF(也意味着耦接于反激式电源转换器200的二次侧SEC的负载是轻载),以及输入电压VIN小于预定电压PV时,初级控制器202可控制反激式电源转换器200操作在所述准谐振模式以使反激式电源转换器200的效率较佳。
另外,在步骤104至步骤108中,由图8、9也很明显地可知,当电感电容谐振波谷数LCRVN小于所述预定数(意味着耦接于反激式电源转换器200的二次侧SEC的负载是一重载),或反激式电源转换器200的操作频率大于预定频率PF(也意味着耦接于反激式电源转换器200的二次侧SEC的负载是重载),或输入电压VIN大于预定电压PV时,初级控制器202可控制反激式电源转换器200操作在所述零电压切换模式以使反激式电源转换器200的效率较佳。
另外,在本发明的另一实施例中,图1的操作方法也适用于一主动箝位(activeclamp)反激式电源转换器1000(如图10所示),其中如图10所示,一光耦合器1002将主动箝位反激式电源转换器1000的一次侧PRI与主动箝位反激式电源转换器1000的二次侧SEC隔开。另外,如图10所示,一开关1004的功能可类比为反激式电源转换器200的同步开关208的功能,且一箝位电容1006的功能可类比为反激式电源转换器200的箝位电路的功能。另外,主动箝位反激式电源转换器1000的操作原理是本发明领域具有熟知技艺者所熟知,在此不再赘述。
综上所述,本发明所公开的反激式电源转换器的操作方法是根据所述初级控制器的电压检测引脚检测所述反激式电源转换器的一次侧的功率开关的导通时间,所述初级控制器的回授引脚检测所述反激式电源转换器的二次侧的同步开关的导通时间,所述初级控制器的回授引脚检测所述反激式电源转换器操作于所述非连续导通模式时的电感电容谐振波谷数,以及所述初级控制器的高压检测引脚检测输入至所述反激式电源转换器的输入电压,控制所述反激式电源转换器在所述准谐振模式和所述零电压切换模式之间切换。因此,相较于现有技术,因为本发明可控制所述反激式电源转换器在所述准谐振模式和所述零电压切换模式之间切换,所以本发明可使所述反激式电源转换器的效率较佳。
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (7)
1.一种反激式电源转换器的操作方法,其特征在于包含:
一电压检测引脚检测所述反激式电源转换器的一次侧的功率开关的导通时间,一回授引脚检测所述反激式电源转换器的二次侧的同步开关的导通时间,所述回授引脚检测所述反激式电源转换器操作于一非连续导通模式时的电感电容谐振波谷数,以及一高压检测引脚检测输入至所述反激式电源转换器的输入电压;及
当所述电感电容谐振波谷数大于一预定数、所述反激式电源转换器的操作频率小于一预定频率和所述输入电压小于一预定电压时,应用于所述反激式电源转换器的控制器使所述反激式电源转换器操作在一准谐振模式。
2.如权利要求1所述的操作方法,其特征在于当所述电感电容谐振波谷数小于所述预定数时,所述控制器使所述反激式电源转换器操作在一零电压切换模式。
3.如权利要求1所述的操作方法,其特征在于当所述反激式电源转换器的操作频率大于所述预定频率时,所述控制器使所述反激式电源转换器操作在一零电压切换模式。
4.如权利要求1所述的操作方法,其特征在于当所述输入电压大于所述预定电压时,所述控制器使所述反激式电源转换器操作在一零电压切换模式。
5.如权利要求1所述的操作方法,其特征在于所述反激式电源转换器是一二次侧调节反激式电源转换器。
6.如权利要求1所述的操作方法,其特征在于所述反激式电源转换器是一主动箝位反激式电源转换器。
7.如权利要求1所述的操作方法,其特征在于所述控制器具有6引脚,且
所述6引脚至少包含所述电压检测引脚、所述回授引脚和所述高压检测引脚。
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