CN112311239B - 电压转换装置 - Google Patents

电压转换装置 Download PDF

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CN112311239B
CN112311239B CN202010238866.1A CN202010238866A CN112311239B CN 112311239 B CN112311239 B CN 112311239B CN 202010238866 A CN202010238866 A CN 202010238866A CN 112311239 B CN112311239 B CN 112311239B
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main switch
leakage inductance
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CN112311239A (zh
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陈佐民
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Power Forest Technology Corp
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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • 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
    • H02M1/34—Snubber circuits
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • 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
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • H02M1/34—Snubber circuits
    • H02M1/342—Active non-dissipative snubbers
    • 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
    • H02M1/34—Snubber circuits
    • H02M1/348—Passive dissipative snubbers
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/1552—Boost converters exploiting the leakage inductance of a transformer or of an alternator as boost inductor
    • 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

Abstract

本发明提供一种电压转换装置。漏感能量回收电路耦接一次侧辅助线圈与控制电路，回收变压器电路的漏感能量以供应控制电路操作电源，下一次主要开关导通前，利用先前回收的漏感能量使主要开关的跨压降低，消除或降低其导通瞬态损失，提升电路整体效率。

Description

电压转换装置
技术领域
本发明涉及一种电子装置，尤其涉及一种电压转换装置。
背景技术
随着社会对于节能减碳的共识，电源转换装置的转换效率的提升已成为一重要指标。然而，在实际应用下，电源转换装置的漏能量往往会造成电源转换装置的转换效率的降低。举例来说，就反驰式电源转换装置而言，其主要是通过变压器来达到能量的转换。然而，变压器本身存在着漏感的问题。因此，反驰式电源转换装置必须承受着漏感所产生的能量耗损，进而导致电源转换装置的转换效率的降低与开关应力的增加。因此，如何改善漏感能量所引发的问题，例如，开关应力的增加、转换效率的降低等，已成电源转换装置在改良上的一重要课题。
发明内容
本发明提供一种电压转换装置，可有效地回收漏感能量，降低电压转换装置的能量损耗。
本发明的电压转换装置包括变压器电路、主要开关、控制电路以及漏感能量回收电路。变压器电路包括一次侧线圈、一次侧辅助线圈和二次侧线圈，变压器电路接收输入电压并输出输出电压至负载。主要开关耦接于一次侧线圈与接地之间。控制电路耦接主要开关，控制主要开关周期性地在导通状态与断开状态间切换，以控制变压器电路的输出。漏感能量回收电路耦接一次侧辅助线圈与控制电路，回收变压器电路的漏感能量以供应控制电路操作电源，并于下一次主要开关导通前，利用漏感能量回收电路回收的漏感能量的能量转换，来降低主要开关的跨压。
在本发明的一实施例中，上述的主要开关处于进入导通状态前的一段跨压储能回收期间提供跨压储能回收路径，以对漏感能量回收电路存储的漏感能量进行能量转换，而使主要开关上的跨压在主要开关由断开状态转为导通状态时低于默认电压。
在本发明的一实施例中，上述的漏感能量回收电路包括第一电容、辅助开关、二极管以及第二电容。第一电容的第一端耦接一次侧辅助线圈。辅助开关耦接于第一电容的第二端与接地之间，辅助开关的控制端耦接控制电路，控制电路于主要开关进入导通状态前的一段跨压储能回收期间导通辅助开关以提供跨压储能回收路径，而使主要开关上的跨压在主要开关由断开状态转为导通状态时低于默认电压。二极管的阳极与阴极分别耦接第一电容的第二端与控制电路。第二电容耦接于二极管的阴极与接地之间。
在本发明的一实施例中，上述的主要开关与辅助开关为晶体管。
在本发明的一实施例中，上述的电压转换装置还包括缓冲电路，其耦接于一次侧线圈的两端之间。
在本发明的一实施例中，上述的缓冲电路包括电容、电阻以及二极管。电容的第一端耦接一次侧线圈的第一端。电阻的第一端耦接一次侧线圈的第一端。二极管的阴极耦接电容与电阻的第二端，二极管的阳极耦接一次侧线圈的第二端。
基于上述，本发明实施例的漏感能量回收电路回收变压器电路的漏感能量以供应控制电路操作电源，并于主要开关处于断开状态的期间，利用先前回收的漏感能量的能量转换在主要开关进入导通状态前进行主要开关的跨压能量回收，而实现零电压切换，并可使变压器电路的漏感能量在下一次主要开关转为断开状态时倾向优先被存储至漏感能量回收电路，而减少缓冲电路的损耗。
为让本发明的上述特征和优点能更明显易懂，下文特举实施例，并配合附图作详细说明如下。
附图说明
图1是依照本发明的实施例的一种电压转换装置的示意图；
图2是依照本发明另一实施例的一种电压转换装置的示意图；
图3是依照本发明的实施例主要开关的控制信号、一次侧线圈的电流、输出电流、主要开关上的跨压以及辅助开关的控制信号的波形示意图。
具体实施方式
图1是依照本发明实施例的一种电压转换装置的示意图，请参照图1。电压转换装置包括变压器电路102、控制电路104、漏感能量回收电路106、缓冲电路108(snubbercircuit)以及主要开关SW1，变压器电路102包括一次侧线圈W1、二次侧线圈W2以及一次侧辅助线圈W3。一次侧线圈W1的第一端接收输入电压Vin，主要开关SW1耦接于一次侧线圈W1的第二端与接地之间，主要开关SW1的控制端耦接控制电路104，在本实施例中主要开关SW1以晶体管来实施，然不以此为限。缓冲电路耦接于一次侧线圈W1的两端之间，漏感能量回收电路106耦接一次侧辅助线圈W3与控制电路104。另外，二次侧线圈W2的一端耦接二极管D1的阳极，二次侧线圈W2的另一端耦接接地，电容C1耦接于二极管D1的阴极与接地之间。二极管D1的阴极与电容C1的共同接点用以产生输出电压Vout给负载RL。
控制电路104可控主要开关SW1周期性地在导通状态与断开状态间切换，以控制变压器电路102的输出。漏感能量回收电路106可于主要开关SW1处于断开状态时回收并存储变压器电路102的漏感能量，所存储的漏感能量可做为操作电源Vcc提供给控制电路104使用。此外，漏感能量回收电路106还可在主要开关SW1处于断开状态的期间提供跨压储能回收路径，以对漏感能量回收电路106所存储的漏感能量进行再转换利用，例如在主要开关SW1快进入导通状态前的一段跨压储能回收期间内，利用先前存储的漏感能量进行能量转换，以回收主要开关SW1上的跨压能量，使主要开关SW1上的跨压在主要开关SW1由断开状态转为导通状态时低于默认电压，而实现零电压切换。且由于漏感能量回收电路106存储的电能在被转移用作主要开关SW1的跨压能量回收而被释放，因此在下一次主要开关SW1转为断开状态时，漏感能量回收电路106将处于重载的状态，而使得变压器电路102的漏感能量优先被存储至漏感能量回收电路106，而后才可能被引导至缓冲电路108，进而可有效地减少缓冲电路108的损耗。
图2是依照本发明另一实施例的一种电压转换装置的示意图，请参照图2。进一步来说，电压转换装置的实施方式可如图2所示，在本实施例中漏感能量回收电路106可包括电容Cs、Cv、辅助开关SW2以及二极管D2，电容Cs的第一端耦接一次侧辅助线圈W3的第一端，一次侧辅助线圈W3的第二端耦接接地，辅助开关SW2耦接于电容Cs的第二端与接地之间，辅助开关SW2的控制端耦接控制电路104，在本实施例中辅助开关SW2为以晶体管来实施，然不以此为限。二极管D2的阳极与阴极分别耦接电容Cs的第二端与控制电路104，电容Cv耦接于二极管D2的阴极与接地之间。此外，缓冲电路108包括电阻R1、电容C2以及二极管D3，电阻R1以及电容C2的第一端耦接一次侧线圈W1的第一端，电阻R1以及电容C2的第二端耦接二极管D2的阴极，二极管D2的阳极耦接一次侧线圈W1的第二端。
如图3所示，在时间点t0～t1的期间，控制电路104输出至主要开关SW1的控制信号Vs1转为高电压水平而使主要开关SW1进入导通状态，另一方面，控制电路104输出至辅助开关SW2的控制信号Vs2为低电压水平，如此将使得一次侧线圈W1的电流Is1线性增加。
在时间点t1～t2的期间，控制电路104输出至主要开关SW1的控制信号Vs1转为低电压水平而使主要开关SW1进入断开状态，存储在变压器电路102的磁性电感(magnetizinginductance)中的能量被传递到二次侧线圈W2，而使得二极管D1导通，输出电流Iout迅速地被抬高而后成线性下降。此外主要开关SW1(在本实施例中其为以晶体管来实施)上的跨压Vds也由低电压水平转换为高电压水平。另外，变压器电路102的漏感能量也在时间点t1～t2的期间传递到漏感能量回收电路106，由于在时间点t1～t2的期间辅助开关SW2为断开状态，传递到漏感能量回收电路106的漏感能量在一次侧辅助线圈W3、辅助开关SW2的寄生二极管(未示出)以及电容Cs构成的回路中形成循环电流，而将漏感能量存储在电容Cs中。其中电容Cs所存储的漏感能量可在下一次主要开关SW1导通时(时间点t4)，通过二极管D1被传送给控制电路104使用。当输出电流Iout线性地下降至0时，二极管D1关闭，变压器电路102的磁性电感与主要开关SW1的寄生电容产生谐振，而使得主要开关SW1上的跨压Vds相应地出现振荡的情形。
此外，漏感能量除了被漏感能量回收电路106所回收外，少部份的漏感能量也可能会被传递至缓冲电路108而被缓冲电路108所吸收。进一步来说，当主要开关SW1进入断开状态时，二极管D3导通，漏感能量对电容C2进行充电，而后二极管D3进入截止状态，存储在电容C2中的电能通过电阻R1进行放电，损耗部分电容C2储能，以维持下一次主要开关SW1断开期间的缓冲效果。
在时间点t2～t3的期间，控制电路104可控制辅助开关SW2进入导通状态，以利用漏感能量回收电路106中存储的漏感能量的能量转换来回收主要开关SW1上的跨压储能，如图3所示，此时主要开关SW1上的跨压Vds也将对应地被提高并迅速地下降至低于默认电压(例如下降至0V，然不以此为限，使用者可依实际需求改变辅助开关SW2的导通时间而进行调整)，而可达到回收主要开关SW1的跨压储能的效果，如此当主要开关SW1在时间点t4被切换至导通状态时，主要开关SW1可进行零电压切换。其中，在时间点t4主要开关SW1导通时，漏感能量回收电路106可进一步将存储在电容Cs中的漏感能量通过二极管D1传送给控制电路104使用。
值得注意的是，由于在时间点t2～t3的期间漏感能量回收电路106中存储的漏感能量可被转移用作主要开关SW1跨压能量回收而被释放，因此当主要开关SW1在时间点t5进入断开状态时，电压器电路102的漏感能量将优先被传递至成为重载的漏感能量回收电路106存储，如此将仅有少部份的漏感能量被缓冲电路108所吸收，因此可有效降低缓冲电路108的损耗，在理想的情形下，甚至可藉由漏感能量回收电路106回收所有的漏感能量，而不会有漏感能量被缓冲电路108吸收。此外，本实施例的辅助开关SW2可以低压开关来实施，并可被整合至集成电路中，相较于现有技术需使用高压开关来实现漏感能量回收的电路，本实施例的电压转换装置可有效地降低制作成本。
综上所述，本发明实施例的漏感能量回收电路回收变压器电路的漏感能量以供应控制电路操作电源，并利用漏感能量回收电路存储的漏感能量的能量转换于主要开关断开期间中准备进入导通前的一段跨压储能回收期间，将主要开关的跨压储能回收，以使主要开关上的跨压在主要开关由断开状态转为导通状态时低于默认电压，而实现零电压切换，并可使变压器电路的漏感能量在下一次主要开关转为断开状态时倾向优先被存储至漏感能量回收电路，而减少缓冲电路的损耗。此外，由于本发明实施例的辅助开关可以低压开关来实施，相较于现有技术需使用高压开关来实现漏感能量回收的电路，本实施例的电压转换装置可有效地降低制作成本。
虽然本发明已以实施例揭示如上，然其并非用以限定本发明，任何所属技术领域中技术人员，在不脱离本发明的精神和范围内，当可作些许的更改与润饰，故本发明的保护范围当视后附的权利要求所界定的为准。

Claims (5)

1.一种电压转换装置，其特征在于，包括：
变压器电路，包括一次侧线圈、一次侧辅助线圈和二次侧线圈，接收输入电压并输出输出电压至负载；
主要开关，耦接于所述一次侧线圈与接地之间；
控制电路，耦接所述主要开关，控制所述主要开关周期性地在导通状态与断开状态间切换，以控制所述变压器电路的输出；以及
漏感能量回收电路，耦接所述一次侧辅助线圈与所述控制电路，
所述漏感能量回收电路包括：
第一电容，其第一端耦接所述一次侧辅助线圈；
辅助开关，耦接于所述第一电容的第二端与所述接地之间，所述辅助开关的控制端耦接所述控制电路，所述控制电路于所述主要开关进入导通状态前的一段跨压储能回收期间导通一次所述辅助开关以提供跨压储能回收路径，而使所述主要开关上的跨压在所述主要开关由断开状态转为导通状态时低于默认电压；
二极管，其阳极与阴极分别耦接所述第一电容的第二端与所述控制电路；以及
第二电容，耦接于所述二极管的阴极与所述接地之间，
所述漏感能量回收电路回收所述变压器电路的漏感能量以供应所述控制电路操作电源，于下一次所述主要开关导通前，利用所述漏感能量回收电路回收的漏感能量的能量转换，来降低所述主要开关的跨压。
2.根据权利要求1所述的电压转换装置，其特征在于，所述主要开关于进入导通状态前的一段跨压储能回收期间提供跨压储能回收路径，以对所述漏感能量回收电路存储的漏感能量进行能量转换，而使所述主要开关上的跨压在所述主要开关由断开状态转为导通状态时低于默认电压。
3.根据权利要求1所述的电压转换装置，其特征在于，所述主要开关与所述辅助开关为晶体管。
4.根据权利要求1所述的电压转换装置，其特征在于，还包括：
缓冲电路，耦接于所述一次侧线圈的两端之间。
5.根据权利要求4所述的电压转换装置，其特征在于，所述缓冲电路包括：
电容，其第一端耦接所述一次侧线圈的第一端；
电阻，其第一端耦接所述一次侧线圈的第一端；以及
二极管，其阴极耦接所述电容与所述电阻的第二端，所述二极管的阳极耦接所述一次侧线圈的第二端。
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