TWI478474B - 切換式電源電路及具有升壓輔助繞組供應器的方法 - Google Patents
切換式電源電路及具有升壓輔助繞組供應器的方法 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
- H02M3/02—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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
-
- 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
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S323/00—Electricity: power supply or regulation systems
- Y10S323/901—Starting circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Description
本發明大致上涉及切換式電源調節器電路,及更特定言之,涉及一切換式電源轉換器,其中一輔助繞組電源供應器包含一升壓電路以增加可用的電壓。
本申請案根據35 U.S.C. §119(e)規定主張2008年1月30日申請的美國臨時專利申請案第61/024,583號及2008年7月25日申請的美國臨時專利申請案第61/083,717號之優先權。
為了供應電力至一切換式電源轉換器的控制電路,有時使用一輔助繞組,尤其是在啟動時當轉換器輸出的電壓還未充分地上升時,或在其中從轉換器的輸出或輸入獲得一內在低電壓「輔助」電源供應器係不切實際或效率極低的實施中,例如,在高壓輸入轉換器中。因為輔助電源供應器典型地不需要獲取許多電流,自輔助電源供應器的輸出移除大的AC變動的濾波電容器或LC電路與轉換器的輸出濾波相比是小的。因此,輔助電源供應器電壓可比轉換器的輸出更加迅速地上升,且比轉換器自身的輸出更早可用作一電壓源用於控制電路。
然而,對於自輔助電源供應器輸出移除大的AC變動的濾波電容器或LC電路,即使一輔助繞組源的電源供應器亦需要時間以充電至一足夠的電壓以操作控制電路。因此,一般需要一啟動滯後時間,在該時間期間轉換器切換式電路必須在控制電路不藉由輔助繞組供電下操作。
因此,希望的是提供一輔助電源供應器電路及方法,該電路與方法在一切換式電源調節器的啟動階段早期,提供用於控制及/或其他電路的操作電壓。
以上所述的在一切換式轉換器的啟動循環之早期,為由一輔助繞組供電的控制及/或其他電路提供操作電壓的目的,在一切換式轉換器及操作該切換式轉換器的一方法中提供。
切換式轉換器有一電感儲存元件,該電感儲存元件包含至少一主要繞組及一輔助繞組。輔助繞組被提供至一升壓電路,該升壓電路藉由主動地切換一電感係數而將輔助繞組的一可用電壓提高至一實質上較高的電壓,藉此在切換式轉換器的啟動階段早期提供用於控制及/或其他電路的操作電壓。升壓電路可使用輔助繞組的漏電感(leakage inductance),該輔助繞組可經繞組以增加漏電感,或可使用一附加電感器以提供用於升壓電路的一電感儲存元件。
升壓電路可以一高於切換式轉換器的一切換速率的速率切換,以便增加操作電壓上升的速率。可使用極性資訊(其可自操作切換式轉換器的控制電路提供)以主動整流輔助繞組的輸出。升壓電路可與切換式轉換器控制電路及視需要與切換式電路整合在一單個晶粒上。
從下文中,更特定言之,從本發明的較佳實施例的描述,如在附圖中說明的,本發明的前述及其他目的、功能及優勢將係顯而易見的。
本發明涵蓋用於提供電力給一切換式電源轉換器內部的控制電路及/或其他電路的電路及方法。該電路自切換式電源轉換器的一輔助繞組操作,並包含一升壓電路以升高自輔助繞組獲得的電壓,因此在切換式電源轉換器的啟動階段早期可取得用於控制電路及/或其他電路的足夠之操作電壓,否則其將自一被動整流器/濾波器輔助電源供應器電路獲得。
現參考圖1,其顯示依照本發明的一實施例的一切換式電源轉換器。一切換式控制器10提供一切換式控制電路CS,該切換式控制電路CS控制藉由一電晶體N1實施的一切換式電路。當電晶體N1為作用中時,藉由跨電感器L1強加輸入電壓VIN
而充電藉由電感器L1供應的一電感儲存元件,引起通過電感器L1的一電流線性地增加。當電晶體N1被撤銷啟動時,通過電感器L1與二極體D1推入電荷至電容器C1,提高在輸出終端OUT的電壓。描繪的轉換器形成一降壓轉換器電路,該降壓轉換器電路可依照通過電阻器R1產生的一回饋電流Iout
,與通過電阻器R2自輸入電壓VIN
提供的一輸入感測電流Iin
而控制提供至輸出終端OUT的電壓。一電流分流器電路13接收電流Iout
及Iin
且也藉由充電電容器C2提供在輔助電源供應器電壓VAUX
下的初始操作電流。
藉由電流分流器電路13供應以充電電容器C2的電流足以操作控制器10,但是在不經由升壓電路12的操作再充電電容器C2下,其不足以對電晶體N1的閘極充電以用於切換。升壓電路12在電晶體N1的初始切換事件期間操作以再充電電容器C2,以便維持一足夠高的電壓以操作控制器10,且最後在許多切換操作已發生後在輔助電源供應器電壓VAUX
下建立全電壓。本發明關注藉由圖1中升壓電路12例示的一輔助電源供應器電路,該輔助電源供應器電路被用於對控制器10供應操作電流,及在電晶體N1的第一切換循環已開始後,供應電流以切換電晶體N1的閘極。電流分流器電路13的操作與構造之細節,被揭示於2008年6月30日由與本申請案相同的發明者申請之名為「對具有感測電路的一電源供應器積體電路供電(POWERING A POWER SUPPLY INTEGRATED CIRCUIT WITH SENSE CIRCUIT)」的美國專利申請案第12/165,547號中,其以引用的方式併入本文中。圖1中說明的例示性降壓轉換器是一切換式電源電路的一實例,其中可併入本發明的升壓電路。然而,應瞭解,存在其他形式的切換式電源電路,且本發明的技術,如在下文中描述的可依照本發明的其他實施例,方便地用在其他形式的切換式電源電路中。
在本發明中,用於操作控制器10的暫時電源(或視需要連續電源)是藉由一升壓電路12供應,該升壓電路12接收自電感器L1的一輔助繞組aux的一信號並產生一輔助電源供應器電壓VAUX
。當電晶體N1為作用中時,由於跨L1的主要繞組施加輸入電壓VIN
,跨輔助繞組aux出現一電壓,如藉由Vin
*Naux
/N所給定,其中Vin
是輸入電壓VIN
的值,Naux
是輔助繞組aux中之匝數及N是電感器L1的主要繞組中之匝數。然而,也在啟動期間,輸入電壓Vin
也上升,且可為非常緩慢地上升。例如,在設計用於自一60Hz AC線操作的一電源供應器中,該線的全波整流版本是一120Hz週期的半正弦波形,其有一慢上升速率。因此,自輔助繞組aux獲得的電壓也緩慢地上升,否則其將延遲電源供應器電壓VAUX
足以對控制器10供電的時間。
在本發明中,藉由將電源供應器電壓VAUX
升壓至比自輔助繞組aux獲得的峰值電壓更高的一電壓,升壓電路12為電源供應器電壓VAUX
足以對控制器10供電提供較早可用性。適合升壓電源供應器電壓VAUX
的多種升壓電路參考特定圖式被進一步詳細描述。依照本發明的實施例的一些升壓電路同時需要控制信號CSA與CSB,而一些不需要。因此,雖然控制器10顯示為包含下文描述的用於操作升壓電路12的某些電路,自下列特定升壓電路的描述顯而易見,控制器10可被實施以僅提供需要的信號。在本發明的一些實施例中,一升壓時脈電路14以實質上高於切換式控制信號CS(例如,4MHz vs. 100kHz)的切換速率的一速率,提供一脈衝升壓信號CSB,以便提供自輔助繞組aux獲得的一相對低電壓的多個「升壓」,以在電源切換式轉換器電路的啟動階段中的一早期點自電源供應器電壓Vaux
產生一需要的電壓位準。另一控制信號CSA,其可與切換式控制信號CS相同,其可用於提供跨繞組aux的電壓的極性的一指示,並在升壓電路12內用於主動地整流藉由輔助繞組aux供應的電壓,其在不指示電感器電流的一必需啟動極性及電感儲存元件的輔助繞組與主要繞組的極性之關係的情況下,可提供一正或負輸出電壓Vaux
的產生。
另外,因為升壓動作可潛在地將電源供應器電壓Vaux
的電壓升壓至高於必需的一位準,如在多個升壓脈衝實施例中,其中脈衝數指示升壓量,可包含一過電壓電路16以藉由升壓時脈14終止信號CSA中升壓脈衝的產生。過電壓電路16被描述為一分路調節器,其也可確保電源供應器電壓Vaux
上的過度電壓發展係藉由因接近/達到一臨限值電壓而將電源供應器電壓Vaux
放電而完全地阻止。最後,因為在某些操作條件諸如空載下,其中叢發在時間上離得很遠,及在低線電壓條件下,其中跨輔助繞組aux的電壓減少,電源供應器電壓Vaux
可下降太低。可提供一欠電壓偵測器18以重新開始升壓電路12內的升壓以恢復電源供應器電壓Vaux
。
一般而言,在本發明的主動升壓實施例中,希望的是設計電感器L1因此可在正常負載條件下,由輔助繞組aux提供的電壓藉由被動整流足以在電源供應器電壓Vaux
下提供必需的電壓。主動升壓動作與選用之主動整流可在啟動的早期階段後終止且如果發生一欠電壓條件則重新開始。
現參考圖2A,其顯示圖1的升壓電路12之細節。輔助繞組aux被耦合至藉由電晶體N4形成、藉由控制信號CSA控制的一升壓切換器,該升壓切換器提供使電感器L1及選用之附加電感器L2的輔助繞組aux短路的升壓脈衝。如果輔助繞組aux的漏電感不足夠高以提供充分的升壓操作,視需要提供電感器L2且其與輔助繞組aux串聯。輔助繞組aux的輸出的主動整流藉由一組電晶體N2與N3提供,該組電晶體N2與N3依照通過輔助繞組aux的電流方向使終端AUX1或AUX2之一短路,因此,在節點VBOOSTA
供應一正電壓。反相器I1使控制信號CSB反相以提供用於控制電晶體N3的適當極性。二極體D3與D4確保耦合至藉由電晶體N4形成的升壓切換器之任一節點的電壓為至多低於接地電位一個二極體壓降(例如,-0.7V)。二極體D1與D2將自正脈衝的能量傳送至提供電源供應器電壓Vaux
的電容器C2中。雖然說明一正電源供應器,應瞭解一負電源供應器可藉由改變元件的極性實施。
現參考圖3A,依照本發明的一實施例說明使用圖2A的升壓電路12的圖1的電路操作。迹線IL
描繪電感器L1的主要繞組中的電流。控制信號CS顯示指示電感器L1中電流方向的切換式控制信號的狀態。控制信號CSA提供三個升壓脈衝,該等升壓脈衝引起電源供應器電壓Vaux
在控制信號CSA的每個脈衝已結束後依照節點VBOOSTA
上電壓量值而逐步升壓。在第三脈衝後,電源供應器電壓Vaux
已超出一過電壓限制Vo1
,引起過電壓偵測器16的輸出ov被確證,此終止控制信號CSA上脈衝的產生。電壓Vu1
說明一電壓,低於該電壓時電源供應器電壓Vaux
將觸發升壓脈衝的重新開始。在升壓脈衝已終止且切換式電源轉換器的操作已穩定後,輔助電源供應器的隨後操作繼續,一般根本不需要升壓操作,例外情況係或許在實質上空載與低線操作條件下,如上文描述的。主動整流在說明的實例中繼續,在節點VBOOSTB
上提供一正電壓與節點VBOOSTA
上的電壓交替,且電源供應器電壓Vaux
中的唯一下降發生在電感器L1中不存在電流的時間間隔期間,其僅當以不連續導通模式(DCM)操作時發生。
現參考圖2B,說明一升壓電路12A,其可替代圖2A的升壓電路12用於圖1的電路中。在升壓電路12A中,一個二極體D5與一升壓切換式電晶體N5串聯連接,該升壓切換式電晶體N5一般僅當一正電壓存在於二極體N5的正極時操作。控制信號CSA用於控制電晶體N5,以當控制信號CSA作用中脈衝時實質上使輔助繞組aux及選用之升壓電感器L2的任一漏電感短路。在控制信號CSA中每個升壓脈衝的結束處,跨輔助繞組aux及視需要跨升壓電感器L2的上升電壓Vx
,通過電容器C3傳遞以產生節點VBOOSTC
上的一電壓,其通過二極體D1提供以充電電容器C2,如上文關於圖2A的升壓電路12之描述。圖2B的升壓電路12A比圖2A的升壓電路12A電路具有需要較少組件的優點,但不包含圖2A的升壓電路12中實施的主動整流,並因此回應於通過輔助繞組aux(及視需要跨升壓電感器L2)的一單個極性電流產生一升壓電源供應器電壓Vaux
。
現參考圖3B,依照本發明的一實施例說明使用圖2B的升壓電路12A的圖1的電路操作。迹線IL
描繪電感器L1的主要繞組中的電流。控制信號CS展現指示電感器L1中電流方向的切換式控制信號的狀態。控制信號CSA提供三個升壓脈衝,該等升壓脈衝引起在控制信號CSA的每個脈衝結束後依照節點VBOOSTA
上的電壓量值而使電源供應器電壓Vaux
逐步升壓。在第三脈衝後,電源供應器電壓Vaux
已超出一過電壓限制Vo1
,引起過電壓偵測器16的輸出ov被確證,此終止控制信號CSA上脈衝的產生。電壓Vu1
說明一電壓,低於該電壓時電源供應器電壓Vaux
將觸發升壓脈衝的重新開始。電源供應器電壓Vaux
中的波紋稍微高於圖2A的升壓電路12,因為電容器C2僅當電流IL
增加時充電,電流IL
增加是在輔助繞組終端AUX1相對於終端AUX2有一正電壓的條件。
在上文描述的實施例中,電感器L1的主要繞組與輔助繞組aux的匝數比率被選擇為一充分低值,因此啟動時在初始升壓脈衝叢發已「加速」電容器C2的充電後,在每個切換式循環中於最大負載條件下將足夠的能量傳送通過輔助繞組aux以充電電容器C2。然而,由於在啟動後跨電容器C2產生對於連接至輔助供應器之電路之操作所需要的更高電壓,這個操作顯著地減少整個電源轉換器的效率,當跨C2的電壓被調節至在控制器10的操作電路中使用的一較低電壓時,此導致能量的一浪費。依照本發明的其他實施例,可提升電感器L1的匝數比率,在啟動後減少跨電容器C2的電壓,在藉由升壓電路提供的啟動電壓增加中有一輕微延遲。
現參考圖4,依照本發明的另一實施例說明使用圖2A的升壓電路12的圖1的電路操作。圖4與圖3A相似,因此在下文中僅描述該等圖之間的差異。此外,雖然在圖4中特定說明輔助升壓電路12的操作,應瞭解下文描述的技術也可應用於圖2B的升壓電路12A。與圖3A中描繪的操作對比,在圖4中,在電源供應器電壓Vaux
升壓至過電壓限制Vo1
及終止控制信號CSA之脈衝的產生之前,控制信號CSA為控制信號CS的幾個循環提供升壓脈衝。在升壓脈衝已終止,且切換式電源轉換器的操作已穩定後,繼續輔助電源供應器的隨後操作,僅間歇地需要升壓操作。
雖然本發明已參考其較佳實施例被特定地顯示並描述,熟悉此項技術者應瞭解,在不脫離本發明的精神與範疇下,可對其在形式及細節上做出前述及其他改變。
10...控制器
12...升壓電路
13...電流分流器
14...升壓時脈電路
16...過電壓電路
18...欠電壓偵測器
AUX1...終端
AUX2...終端
aux...輔助繞組
C1...電容器
C2...電容器
CS...控制電路
CSA...控制信號
CSB...脈衝的升壓信號
D1...二極體
D2...二極體
D3...二極體
D4...二極體
D5...二極體
I1...反相器
Iin
...輸入感測電流
IL
...電流
Iout
...回饋電流
L1...電感器
L2...電感器
N1...電晶體
N2...電晶體
N3...電晶體
N4...電晶體
N5...電晶體
OUT...輸出終端
ov...輸出
R1...電阻器
R2...電阻器
VAUX
...輔助電源供應器電壓
VBOOSTA
...節點
VBOOSTB
...節點
VBOOSTC
...節點
VIN
...輸入電壓
Vol...過電壓限制
Vul...電壓
Vx...電壓
圖1是依照本發明的一實施例,描繪一切換式轉換器的一方塊圖;
圖2A是依照本發明的一實施例,描繪圖1的升壓電路12之細節的一示意圖;
圖2B是依照本發明的另一實施例,描繪可用於替代圖1的升壓電路12的另一升壓電路12A之細節的一示意圖;
圖3A是依照本發明的一實施例,描繪圖2A的升壓電路12之操作細節的一時序圖;
圖3B是依照本發明的一實施例,描繪圖2B的升壓電路12A之操作細節的一時序圖;及
圖4是依照本發明的另一實施例,描繪圖2A的升壓電路12之操作細節的一時序圖。
10...控制器
12...升壓電路
13...電流分流器
14...升壓時脈電路
16...過電壓電路
18...欠電壓偵測器
aux...輔助繞組
C1...電容器
C2...電容器
CS...控制電路
CSA...控制信號
CSB...脈衝的升壓信號
D1...二極體
Iin
...輸入感測電流
Iout
...回饋電流
L1...電感器
L2...電感器
N1...電晶體
OUT...輸出終端
ov...輸出
R1...電阻器
R2...電阻器
VAUX
...輔助電源供應器電壓
VIN
...輸入電壓
Claims (27)
- 一種切換式電源電路,其包括:一電感儲存元件,其用於將該切換式電源電路的一輸入耦合至該切換式電源電路的一輸出,且其具有一主要繞組與一輔助繞組;一切換式電路,其用於控制該電感儲存元件的充電,該充電係自連接至該切換式電源電路的該輸入的一輸入電壓源至該電感儲存元件的該主要繞組;一控制電路,其被耦合至該切換式電路以用於回應於自該切換式電源電路的該輸出提供的一回饋信號,產生用於操作該切換式電路的控制信號;及一升壓電路,其具有耦合至該電感儲存元件的該輔助繞組的一升壓輸入,用於自一升壓輸出供應電力至該控制電路,其中該升壓電路在該升壓輸出提供一升壓輸出電壓,該升壓輸出被升壓至實質上大於至少在該切換式電源電路的啟動期間跨該輔助繞組的一電壓,其係藉由將從該輔助繞組提供之能量以一實質上等於跨該輔助繞組電壓之一電壓儲存於一儲存電感且以該升壓輸出之該實質上較大電壓從該儲存電感釋放能量來達成。
- 如請求項1之切換式電源電路,其中該升壓電路係藉由實質上使該輔助繞組短路一段時間及在該段時間結束後,跨該升壓輸出應用該輔助繞組,使用該輔助繞組的一漏電感作為該儲存電感以升高跨該輔助繞組的一可用電壓。
- 如請求項1之切換式電源電路,其中該儲存電感係與該輔助繞組串聯耦接的一第二電感儲存元件,且其中該升壓電路藉由實質上使該第二電感儲存元件與該輔助繞組的該串聯組合短路一段時間,且在該段時間結束後跨該升壓輸出應用該第二電感儲存元件與該輔助繞組的該串聯組合,升高跨該輔助繞組的一可用電壓。
- 如請求項1之切換式電源電路,其中該升壓電路包含一主動切換器,該主動切換器用於回應於一升壓脈衝信號跨該輔助繞組提供一低阻抗路徑,藉此在該升壓脈衝信號的一脈衝已結束後,跨該輔助繞組的一漏電感或與該輔助繞組串聯的電感器產生一電壓,該電壓實質上高於在跨該輔助繞組可用的一斷路電壓。
- 如請求項4之切換式電源電路,其中該升壓脈衝信號是一重複脈衝信號,其在該切換式電源電路的該切換式電路的一切換速率的一單個週期內有多個週期。
- 如請求項5之切換式電源電路,其進一步包括一第一偵測器,該第一偵測器係用於偵測何時該升壓電路的一輸出的一量值已超過一第一預定電壓,且其中回應於該第一偵測器的一輸出而終止該升壓脈衝信號。
- 如請求項6之切換式電源電路,其進一步包括一第二偵測器,該第二偵測器係用於偵測何時該升壓電路的該輸出的該量值已下降低於一第二預定電壓,且其中回應於該第二偵測器的一輸出而重啟動該升壓脈衝信號。
- 如請求項1之切換式電源電路,其進一步包括至少一主 動整流器切換器,用於相對於該升壓電路的一輸出而交替地顛倒該輔助繞組的一輸出的一極性,藉此可產生該升壓電路的一升壓輸出而同時該電感儲存元件被充電或被放電。
- 如請求項8之切換式電源電路,其中遵照控制該切換式電路的一控制信號而控制該至少一主動整流器切換器。
- 如請求項1之切換式電源電路,其中該升壓電路被選擇性地操作俾使該升壓輸出上電壓之升壓當該切換式電源電路在該切換式電源電路啟動之後操作時至少部分時間被關閉。
- 一種控制一切換式電源電路的方法,其包括:切換跨一電感儲存元件之一主要繞組的一輸入電壓源以傳送電力至該切換式電源電路的一輸出,其中該電感儲存元件具有該主要繞組與一輔助繞組;遵照自該切換式電源電路的該輸出提供的一回饋信號控制該切換的一週期;及升高該電感儲存元件的該輔助繞組的一電壓以用於供應電力至執行該控制的一控制電路,其中該升壓提供一升壓輸出電壓,該升壓輸出電壓實質上大於至少在該切換式電源電路的啟動期間跨該輔助繞組的一電壓,其係藉由將從該輔助繞組提供之能量以一實質上等於跨該輔助繞組電壓之一電壓儲存於一儲存電感且以該實質上較大之升壓輸出電壓從該儲存電感釋放能量來達成。
- 如請求項11之方法,其中該升壓包括實質上使該輔助繞 組短路以在該輔助繞組的漏電感中儲存能量,其中該儲存電感係由該輔助繞組之該漏電感提供,並隨後結束該短路以升高跨該輔助繞組的一可用電壓並跨該升壓輸出應用該輔助繞組。
- 如請求項11之方法,其中該升壓包括實質上使該輔助繞組與另一升壓電感器的一串聯組合短路,以在該升壓電感器中儲存能量,其中該升壓電感器提供該儲存電感,並隨後結束該短路以升高跨該輔助繞組的一可用電壓及跨該升壓輸出應用該輔助繞組。
- 如請求項11之方法,其中該升壓包括:回應於一升壓脈衝信號主動地切換跨該輔助繞組的一低阻抗路徑;回應於該升壓脈衝信號的一結束,撤銷啟動跨該輔助繞組的該低阻抗路徑,其中該儲存電桿係由該輔助繞組之一漏電感提供,藉此跨該輔助繞組的該漏電感或與該輔助繞組串聯的電感器產生一電壓,該電壓實質上高於在跨該輔助繞組可用的一斷路電壓。
- 如請求項14之方法,其中該升壓脈衝信號是一重複脈衝信號,其在該切換的一切換速率的一單個週期內有多個週期。
- 如請求項15之方法,其進一步包括:第一次偵測何時該升壓電路的一輸出的一量值已超過一第一預定電壓;及當該第一次偵測偵測到該升壓電路的該輸出的量值已 超過該第一預定電壓時,停止產生該升壓脈衝信號。
- 如請求項16之方法,其進一步包括:第二次偵測該升壓電路的該輸出的該量值已下降低於已第二預定電壓;及當該第二次偵測偵測到該升壓電路的該輸出的該量值已下降低於該第二預定電壓時,重新繼續產生該升壓脈衝信號。
- 如請求項17之方法,其進一步包括主動整流該輔助繞組的一輸出,藉此可在該電感儲存元件被充電或被放電時執行該升壓。
- 如請求項18之方法,其中回應於控制該切換式電路的一控制信號而執行該主動整流。
- 如請求項11之方法,其進一步包含在該切換式電源電路啟動之後該切換式電源電路操作之至少一部份時間關閉該升壓。
- 一種積體電路,其包括:一切換式控制電路,其用於回應於提供至該積體電路的一回饋信號而控制一切換以用於透過一主要繞組對一外部電感儲存元件充電;及一升壓電路,其有耦合至一升壓輸入終端的一輸入以用於耦合該積體電路至該外部電感儲存元件的一輔助繞組,其中該升壓電路自一升壓輸出供應電力至該切換式控制電路,其中該升壓電路在該升壓輸出提供一電壓,該升壓輸出被升壓至實質上高於至少在該積體電路的啟 動期間跨該輔助繞組的一電壓,其係藉由將從該輔助繞組提供之能量以一實質上等於跨該輔助繞組電壓之一電壓儲存於一儲存電感且以該升壓輸出之該實質上較大電壓從該儲存電感釋放能量來達成,且其中該升壓電路包含一主動切換器,該主動切換器用於回應於一升壓脈衝信號提供跨該輔助繞組的一低阻抗路徑。
- 如請求項21之積體電路,其中該升壓脈衝信號是一重複脈衝信號,其在該切換式電源電路的該切換式電路的一切換速率的一單個週期內有多個週期。
- 如請求項22之積體電路,其進一步包括一第一偵測器,該第一偵測器係用於偵測何時該升壓電路的一輸出的一量值已超過一第一預定電壓,且其中回應於該第一偵測器的一輸出而終止該升壓脈衝信號。
- 如請求項23之積體電路,其進一步包括一第二偵測器,該第二偵測器係用於偵測何時該升壓電路的該輸出的該量值已下降低於一第二預定電壓,且其中回應於該第二偵測器的一輸出而重啟動該升壓脈衝信號。
- 如請求項21之積體電路,其進一步包括至少一主動整流器切換器,用於相對於該升壓電路的一輸出而交替地顛倒該輔助繞組的一輸出的一極性,藉此可在該外部電感儲存元件被充電或被放電時產生該升壓電路的一升壓輸出。
- 如請求項25之積體電路,其中遵照控制該切換式電路的一控制信號而控制該至少一主動整流器切換器。
- 如請求項21之積體電路,其中該升壓電路被選擇性地操作俾使該升壓輸出上電壓之升壓當該積體電路在該積體電路啟動之後操作時至少部分時間被關閉。
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Also Published As
Publication number | Publication date |
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CN101630901B (zh) | 2013-07-03 |
US20090190379A1 (en) | 2009-07-30 |
US8008898B2 (en) | 2011-08-30 |
TW200945746A (en) | 2009-11-01 |
CN101630901A (zh) | 2010-01-20 |
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