TWI469487B - 諧振切換功率電路、在一諧振切換功率電路中之低功率操作方法及積體電路控制器 - Google Patents

諧振切換功率電路、在一諧振切換功率電路中之低功率操作方法及積體電路控制器 Download PDF

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TWI469487B
TWI469487B TW98124453A TW98124453A TWI469487B TW I469487 B TWI469487 B TW I469487B TW 98124453 A TW98124453 A TW 98124453A TW 98124453 A TW98124453 A TW 98124453A TW I469487 B TWI469487 B TW I469487B
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bursts
pulses
circuit
switching power
resonant
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TW201012040A (en
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John L Melanson
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Cirrus Logic Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
    • H01F38/023—Adaptations of transformers or inductances for specific applications or functions for non-linear operation of inductances
    • H01F2038/026—Adaptations of transformers or inductances for specific applications or functions for non-linear operation of inductances non-linear inductive arrangements for converters, e.g. with additional windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • 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
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • 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

Description

諧振切換功率電路、在一諧振切換功率電路中之低功率操作方法及積體電路控制器
本發明大體上涉及切換功率調節器電路，且更明確言之，本發明涉及一諧振切換功率轉換器，其中叢發模式脈衝型樣在叢發之間被改變。
本申請案根據35 U.S.C. §119(e)規定主張2008年7月25日申請之美國臨時專利申請案第61/083,717號的優先權。
本美國專利申請案係關於名為「具有叢發模式轉移成形之諧振切換功率轉換器(RESONANT SWITCHING POWER CONVERTER WITH BURST MODE TRANSITION SHAPING)」之美國專利申請案第12/XXX,XXX號，本案藉由相同發明者在同時期申請且已讓與給相同之受讓人。上述參考美國專利申請案之揭示的內容以引用的方式併入本文中。
在諧振切換功率轉換器中，隨著輸出電流需求下降，切換頻率升高以減少功率輸出。然而，當遇到低或零負載狀況時，所需之切換頻率可能變得不切實際且通常將在效率上產生一顯著下降，其歸因於聯合在輸出功率之相對下降對比與在普通切換操作之功率消耗的切換損耗之升高。由於上述原因，一低功率「叢發」模式通常使用在低或零輸出電流需求週期，在該週期該輸出電壓藉由發出脈衝之叢發而被保持以重新開始在足夠向該諧振切換功率轉換器之該輸出電容器重充電之一位準振動該諧振電路。在該等叢發之間，該輸出電容器向該負載提供電力。
然而，因為叢發足夠稀少而落入可聽範圍，典型的叢發操作造成可聽雜訊。歸因於磁電機限制性性能，感應器及變壓器之核心將引起歸因於藉由該等叢發產生之該等暫態之可聽振動。
因此，期望提供具有一低功率操作模式之一諧振切換功率轉換器，該模式具有降低的可聽振動。
上文陳述之提供一低功率操作模式用於具有降低的可聽振動之一諧振切換功率轉換器的目的係於一諧振切換功率轉換器及其操作方法中達成。
該諧振切換功率轉換器包含一諧振槽電路、一切換電路用於從一輸入電壓源向該諧振槽電路傳輸能量，及一變壓器用於耦接該諧振槽電路至該切換功率轉換器之輸出。在一低功率模式之操作中，該切換電路發出在該等叢發之間具有一改變的型樣或持續時間之脈衝叢發，其跨該可聽頻譜擴展該可聽雜訊，在該音訊頻譜中降低峰值能量，且降低該雜訊之感知心理聲學響度。
若在該等叢發內之脈衝的型樣被改變，該變動可為脈衝的數量、該初始脈衝之極性。另一選擇為或以組合形式，脈衝持續時間可在一叢發內均勻地、隨機地被改變或根據儲存在記憶體中的表格藉由從許多組型樣中選擇而被改變。
從下文中，更特定言之，從如附圖中所說明的本發明之較佳實施例的描述中，本發明之前述及其他目的、特徵及優點將變得顯而易見。
本發明涵蓋用於降低在低功率叢發模式操作之諧振切換功率轉換器的感應器及輸出變壓器內的可聽振動之電路及方法。在該叢發及/或脈衝結構中之變動在叢發之間作出以加寬引起該可聽振動的暫態之音訊頻譜。
現參考圖1，其繪示根據本發明之一實施例的一諧振切換功率轉換器電路。一切換控制電路10控制藉由電晶體N1及N2實施之一切換電路。一串聯諧振槽電路藉由一電感及一電容形成且藉由電晶體N1及N2之切換動作被通電。一變壓器T1從該諧振槽電路耦接能量至一整流橋BR1，其提供經整流電流用於充電輸出電容器C3。輸出電壓VOUT 可被在叢發模式藉由向切換控制電路10提供一回饋信號之一回饋電路12而保持在一預定電壓。或者，該叢發模式可為「無約束的(free-wheeling)」，使得足夠供給負載電流足夠低以觸發叢發模式操作之叢發可被預定且在無回饋控制下供給。切換控制電路10包含邏輯及/或演算法以產生該等叢發，其中叢發間之變動循環以加寬由電晶體N1及N2在對該諧振槽電路充電之操作產生的該等暫態之音訊頻譜。
在圖1中，該諧振槽電路之電感被說明為一感應器L1加變壓器T1之主要繞組之任何洩漏電感。然而，應瞭解該諧振槽電路之電感可完全藉由變壓器T1之該洩漏電感供給且因此感應器L1在本發明之一些實施例中將不存在。該諧振槽電路之電容藉由該槽之總串聯電容供給，其如所說明包含電容器C1及C2之並聯組合、該寄生繞組電容CT 與任何在變壓器T1之該主要繞組的反射電容並聯，且當電晶體N1及N2均不啟動時為電晶體N1及N2之該等寄生電容(CpN1 及CpN2 )之並聯組合。
在低負載或開放電路狀況下，切換控制電路10操作在一叢發模式，以在該狀況下保持該諧振切換功率轉換器電路之效率。因藉由切換控制電路10產生之該切換頻率通常非常高且隨著該負載電流減少，該切換頻率被升高遠離該串聯諧振槽電路之該諧振頻率，歸因於操作切換電晶體N1及N2之損耗亦通常較高且隨下降之負載而升高。因此，為保持輸出電壓VOUT 在所需位準，更有效的是在輸出電壓VOUT 偵測下降及產生來自切換控制電路10之脈衝之一叢發，該切換控制電路向該諧振槽傳輸能量以對輸出電容器C3充電，達到一總數足以確保在叢發之間的時間將非常長。或者，如上文所提及，該等叢發可根據按輸出電壓VOUT 之一給定最小值供給電流至一負載所需的最小叢發尺寸及叢發間隔在預定間隔產生。
現參考圖2，其根據本發明之一實施例在一時序圖中說明圖1之該諧振切換功率轉換器電路之叢發模式操作。在時間T1，一叢發開始且包含六個正脈衝及六個負脈衝。控制信號CA控制電晶體N1以產生在藉由該切換電路(舉例而言，圖1之電晶體N1及N2)向該諧振槽電路供給之電壓VS 所觀測之該等正脈衝。控制信號CB控制電晶體N2以產生在電壓VS 所觀測之該等負脈衝。如所說明，該等脈衝不為均勻持續時間，其對本發明不為一必要條件，但提供在降低全部暫態能量上的優點，如在上文合併之美國專利申請案「具有叢發模式轉移成形之諧振切換功率轉換器(RESONANT SWITCHING POWER CONVERTER WITH BURST MODE TRANSITION SHAPING)」中所描述。該等叢發之最先兩個及最後兩個脈衝被縮短至該等剩餘脈衝持續時間之持續時間之二分之一，其將在下文進一步詳細描述。在時間T2，該第一叢發結束且電壓VS 不再藉由電晶體N1及N2強迫為該輸入電壓位準，但係藉由該諧振槽電路之「振盪」而產生的。
為放寬藉由該等叢發產生之該音訊頻譜，其在特定頻率降低該可聽振動之能量，藉此降低響度的該心理聲學感知，切換控制10可使用若干技術之一。在圖2中說明兩個可能的技術，且該等技術可被個別地或組合應用。該第一技術係改變在時間T1與T3之間的時間間隔的值，該時間間隔為叢發重複時期TBURST ，其係藉由改變叢發之間的時間(時間T3至時間T2)而同等地執行的。該結果係在該等叢發內之該等脈衝不被修改，但該等叢發之基本重複率被改變，其係設定在可聽範圍聽取的基本頻率的主要因素。所說明之該第二技術係改變在該等叢發內的脈衝數n。在圖2中，該第一叢發具有n=6之脈衝且該第二叢發具有n=8。改變脈衝的數量將影響該頻譜之線寬且改變脈衝的數量擴展在頻譜中之線，產生在該可聽頻率範圍擴展能量之所期望的效果。
現參考圖3，其根據本發明之另一實施例進一步說明本發明之該諧振切換功率轉換器之該叢發模式操作的細節。在所說明之實施例中，該最初脈衝極性在叢發間被改變，其改變了該暫態能量之可聽頻譜，且係說明在圖3中的唯一的此技術，因為否則該等叢發在重複率及脈衝型樣上為同樣的。兩個脈衝可相對於在該叢發中間之脈衝的該額定脈衝時間(時間Td 至時間TC )而被縮短。縮短兩個或多個脈衝提供了兩個優點：1)在該叢發開始及結束之該暫態性能被緩和；及2)效率可被進一步改良且切換暫態藉由在切換事件開始下一脈衝叢發方向中的該諧振槽電路之「振盪」端改變VS 之靜態值而下降。為獲得該第二優點，每個叢發之該第一脈衝(及最後脈衝)之極性被如圖所示地交替，其可藉由交換如所說明在每個叢發之間的該控制信號CA及CB之控制型樣而執行。
經過感應器L1之感應器電流IL (或經過任何向該諧振槽電路提供串聯電感之電感的電流)在時間Tb 升高至一峰值。隨後，藉由該控制信號CB的動作產生之負脈衝及藉由該控制信號CA的動作產生之正脈衝繼續引起在感應器電流IL 中的充分相同及相反的極性，且具有比該等開始脈衝更長的持續時間，如在時間TC 及時間Td 之間的持續時間所說明。若該叢發之該第一脈衝被產生具有一全額定脈衝時間(也就是，與該叢發中間之脈衝的持續時間相同的持續時間)，則在感應器電流IL 中的第一峰值將為圖中峰值的兩倍，產生一暫態，其將在切換電晶體N1及N2中以及變壓器T1及其他與該變壓器T1之主要繞組串聯的組件中引起壓力，及在變壓器T1及感應器L1中引起歸因於磁電機限制的可聽雜訊。所形成之該暫態亦將引起輸出電容器C3的更快充電，歸因於在輸出電容器充電電流IOC 之更大峰值，引起在電容器C3及整流橋BR1之升高的壓力。
在時間Tb 與時間Tb' 之間，該叢發之一第二脈衝係產生具有一持續時間，其與開始在該叢發之開始處的半持續時間脈衝及該叢發中間之該全持續時間(舉例而言，持續時間)均不同，且類似地在時間Te' 及時間Te 之間，提供一相反極性及相等持續時間之脈衝以保持淨零平均值感應器電流IL 。然而，雖然感應器電流係保持在一淨零位準，電壓VS 係在該等叢發之間不保持在一零額定位準。在該第一叢發之結束，在時間Tf ，一偏移電壓-Voff 保留在該切換電路之輸出(舉例而言，在圖1之電晶體N1及N2之寄生電容CpN1 及CpN2 的共同連接)。藉由交替該等叢發之極性(藉由交換控制信號CA及CB之控制型樣)，在時間Ta '開始下一叢發之脈衝具有與該最後叢發之結束脈衝極性相同之極性，且該切換電路必須產生之該電壓變化藉此被降低偏移電壓Voff 的值，其降低了切換電晶體N1及N2之壓力及降低線暫態。在該第二叢發之結束，在時間Tf' ，一電壓+Voff 保留在電壓VS 之該靜態值，該電壓VS 將匹配將產生在下一叢發開始之該正脈衝之極性。
藉由用降低的持續時間脈衝開始而不是一全持續時間脈衝，在每個叢發之開始的該暫態電流被消除。此外，在每個叢發的結束，相反極性(在該說明中係負極)之縮短持續時間脈衝產生在時間Te' 及Tf 之間，以避免在該等叢發之結束產生相似暫態及匹配在一相反極性電流內注入該諧振槽電路之該電流。在時間Tg ，該諧振槽之振盪動作說明在感應器電流IL 及電壓VS 之間之九十(90)度的相對相位。一偶數個正及負脈衝(舉例而言，正及負的四個全持續時間脈衝，兩個縮短持續時間正脈衝及兩個縮短時間負脈衝)被強迫對該叢發保持該感應器電流IL 在一淨零平均值，使得一零感應器電流出發點對每個叢發產生一零感應器電流終點。該上述動作確保該感應器電流IL 不藉由在該等叢發開始及結束之電晶體N1及N2之該接通及斷開而被充分切斷，進一步降低暫態壓力及可聽效果。
現參考圖4A，其根據本發明之另一實施例繪示圖1之該諧振切換電路中之一叢發模式。在圖4A中說明之該叢發模式與在圖2及圖3中說明之叢發模式類似，因此下文將僅描述它們之間的區別，且為明確起見僅說明控制信號CA及CB。在圖4A之該叢發模式中，如持續時間TB1 及TB2 所說明，捨棄調整如圖2中在該等叢發之間的比率或該等叢發中之脈衝的數量，轉而改變該叢發持續時間TB 。因為該等脈衝之相對持續時間決定感應器電流IL 波形之形狀，若全部叢發係相對於時間按比例調整，則該等電流峰值將被降低或升高，但該等叢發之該淨零感應器電流性能連同殘餘電壓偏移性能被保持，其可藉由保持該叢發(未繪示)之該兩個最初及終端脈衝的寬度而被保持，或根據叢發持續時間TB 之變動允許細微改變。
現參考圖4B，其根據本發明之另一實施例繪示圖1之該諧振切換電路中的一叢發模式。在圖4B中說明的該叢發模式根據一偽隨機數字生成器(PRNG)在每個叢發內改變該等脈衝的持續時間。因為感應器電流IL 必須仍被保持在一淨零值，每個正脈衝藉由一相等持續時間負脈衝跟隨，其對於本發明不為一限制，但提供一簡單技術用於確保該等脈衝之隨機持續時間變動可在不破壞該淨零感應器電流IL 之平衡下被應用。如所說明，該第一叢發與該第二叢發大體上不同，其引起藉由該等叢發產生之該可聽頻譜(假設該隨機變動繼續)被廣泛地擴展在該音訊頻率範圍。為保持以上電壓偏移操作在電壓VS 且若該等第一脈衝係隨機地被設定到一長的持續時間，為避免產生一大的初始暫態，該最初兩個及最後兩個脈衝的固定脈衝時間被保持，且僅該叢發之該中間脈衝在持續時間上被改變。然而，該性能不為本發明之一需求。
現參考圖4C，其根據本發明之另一實施例繪示圖1之諧振切換電路中的一叢發模式。說明在圖4C中之該叢發模式根據從儲存中檢索到的脈衝寬度型樣的一預定表格在每個叢發內改變該等脈衝之持續時間。因為該等型樣不為隨機產生的，但為預定的，每個脈衝可為不同持續時間，且一淨零感應器電流IL 平衡藉由預計算該持續時間而被保持以產生該淨零性能。同樣地，該初始兩個脈衝及最終兩個脈衝之持續時間可為該等型樣而被調整，以提供所期望之電壓VS 的(若干)偏移值。可按一循環旋轉(有系統地)或隨機地選擇該等型樣。
現參考圖5，其根據本發明之一實施例繪示說明可被用於產生在圖4C中說明之該叢發模式操作之一切換控制電路10A。一計數器或PRNG 50向含有該脈衝型樣表格之一非揮發性(NV)儲存器52提供一選擇位址。脈衝型樣對被供應至移位暫存器54A及54B，其在每個叢發期間藉由叢發時鐘56被記錄時間以產生控制信號CA及CB。
雖然本發明已參考其較佳實施例被明確地繪示及描述，熟悉此項技術者應瞭解前述及其他在形式及細節上之改變可在不脫離本發明之範圍及精神下作出。
10．．．切換控制電路
10A．．．切換控制電路
12．．．回饋電路
50．．．計數器或PRNG
52．．．非揮發性(NV)儲存器
54A．．．暫存器
54B．．．暫存器
56．．．叢發時鐘
BR1．．．整流橋
C1．．．電容器
C2．．．電容器
C3．．．輸出電容器
CA．．．控制信號
CB．．．控制信號
CpN1 ．．．寄生電容
CpN2 ．．．寄生電容
CT ．．．寄生繞組電容
IL ．．．感應器電流
IOC ．．．充電電流
L1．．．感應器
N1．．．電晶體
N2．．．電晶體
T1．．．時間
T1．．．變壓器
T2．．．時間
T3．．．時間
Ta ．．．時間
Ta '．．．時間
TBURST ．．．叢發重複時間
Tb ．．．時間
Tb' ．．．時間
TC ．．．時間
Td ．．．時間
Te ．．．時間
Te' ．．．時間
Tf ．．．時間
Tf' ．．．時間
Tg ．．．時間
+Voff ．．．偏移電壓
-Voff ．．．偏移電壓
VOUT ．．．輸出電壓
VS ．．．電壓
圖1係一簡化示意圖，其根據本發明之一實施例描述一諧振切換功率轉換器；
圖2係一時序圖，其根據本發明之一實施例描述圖1之該切換功率轉換器之叢發模式操作；
圖3係一時序圖，其根據本發明之另一實施例描述圖1之切換功率轉換器之叢發模式操作的細節；
圖4A至4C係時序圖，其等根據本發明之多種實施例描述圖1之切換功率轉換器內之叢發模式操作的細節；及
圖5係一方塊圖，其根據本發明之一替代實施例描述可被運用在圖1之該諧振切換功率轉換器內之一控制電路10A。
10．．．切換控制電路
12．．．回饋電路
BR1．．．整流橋
C1．．．電容器
C2．．．電容器
C3．．．輸出電容器
CA．．．控制信號
CB．．．控制信號
CpN1 ．．．寄生電容
CpN2 ．．．寄生電容
CT ．．．寄生繞組電容
L1．．．感應器
N1．．．電晶體
N2．．．電晶體
T1．．．變壓器
VOUT ．．．輸出電壓
VS ．．．電壓

Claims (21)

  1. 一種諧振切換功率電路，其包括：一諧振電路，其包含至少一電感及至少一電容用於傳輸能量至該諧振切換功率電路之一輸出；一切換電路，其被耦接至該諧振電路以從一輸入電壓源傳輸能量至該諧振電路；及一控制電路，其具有一叢發模式用於在各低能量需求狀況期間控制該切換電路，其中以間歇性叢發產生許多脈衝，且其中該等叢發按一方式改變，其降低該等叢發之一平均音訊頻譜的峰值振幅超過具有一大體上固定的脈衝型樣及叢發重複率之一叢發的峰值振幅。
  2. 如請求項1之諧振切換功率電路，其中在該等叢發內之該等脈衝之若干型樣被改變以加寬該等叢發之該平均音訊頻譜。
  3. 如請求項2之諧振切換功率電路，其中該等叢發之至少一開始或結束脈衝具有一預定持續時間，該預定持續時間與該等叢發之一中間的脈衝週期不同。
  4. 如請求項2之諧振切換功率電路，其中該等脈衝之若干持續時間被隨機改變以加寬該等叢發之該平均音訊頻譜。
  5. 如請求項2之諧振切換功率電路，其中在該等叢發內之該等脈衝之該等型樣被變化，其係藉由交替地從多組預定脈衝型樣之間選擇以在開始每個脈衝前從該等預定脈衝型樣之一選擇下一型樣。
  6. 如請求項5之諧振切換功率電路，其進一步包括一儲存器，該儲存器用於儲存一查找表，該查找表具有決定多組預定脈衝型樣的兩組或多組項目，且其中該控制電路交替地選擇及讀取該等項目組以根據該等所選擇的項目組產生該等叢發。
  7. 如請求項2之諧振切換功率電路，其中在該等叢發內之該等脈衝之該等型樣藉由改變該等叢發內之該等脈衝的各持續時間而改變。
  8. 如請求項2之諧振切換功率電路，其中在該等叢發內之該等脈衝之該等型樣藉由改變該等叢發內之脈衝數量而改變。
  9. 如請求項2之諧振切換功率電路，其中在該等叢發內之該等脈衝的該等型樣藉由改變該等叢發內之一初始脈衝之極性而改變。
  10. 如請求項1之諧振切換功率電路，其中在該等叢發之間之諸時間間隔被改變以加寬該等叢發之平均音訊頻譜。
  11. 一種在一諧振切換功率電路中之低功率操作方法，該方法包括：從一諧振槽電路傳輸能量至該諧振切換功率電路之一輸出；藉由操作一切換電路從一輸入電壓源傳輸能量至該諧振槽電路；及在一叢發模式操作該切換電路，其中叢發地產生許多脈衝以在當該諧振切換功率電路之該輸出處的能量需求 低時，間歇地向該諧振切換功率電路之該輸出提供該能量，且其中該等叢發按一方式改變，其降低該等叢發之一平均音訊頻譜的峰值振幅超過具有一大體上固定的脈衝型樣及叢發重複率之一叢發的峰值振幅。
  12. 如請求項11之方法，其中在該等叢發內之該等脈衝之諸型樣被改變以加寬該等叢發之該平均音訊頻譜。
  13. 如請求項12之方法，其中該等叢發之至少一開始或結束脈衝具有一預定持續時間，其與該等叢發之一中間的脈衝之一週期不同。
  14. 如請求項12之方法，其中該等脈衝之諸持續時間被隨機改變以加寬該等叢發之該平均音訊頻譜。
  15. 如請求項12之方法，其中在該等叢發內之該等脈衝之該等型樣被改變，其係藉由交替地從多組預定脈衝型樣之間選擇以在開始每個脈衝前從該等預定脈衝型樣之一選擇下一型樣。
  16. 如請求項15之方法，其進一步包括從含有一查找表之一儲存器讀取該下一型樣，該查找表具有決定該多組預定脈衝型樣的兩組或多組項目，且其中該選擇交替地從該儲存器選擇及讀取該等項目組以根據該等所選擇的項目組產生該等叢發。
  17. 如請求項12之方法，其中在該等叢發內之該等脈衝之該等型樣藉由改變在該等叢發內之該等脈衝之各持續時間而改變。
  18. 如請求項12之方法，其中在該等叢發內之該等脈衝之該 等型樣藉由改變在該等叢發內之脈衝數量而改變。
  19. 如請求項12之方法，其中在該等叢發內之該等脈衝之該等型樣藉由改變在該等叢發內之一初始脈衝之極性而改變。
  20. 如請求項11之方法，其中在該等叢發之間之各時間間隔被改變以加寬該等叢發之該平均音訊頻譜。
  21. 一種積體電路控制器，其係被整合於一單晶粒上用於控制一諧振切換功率轉換器，其中該積體電路控制器向具有一低功率叢發模式之一切換電路提供若干控制信號，在該低功率叢發模式中，當該諧振切換功率轉換器之一輸出處的能量需求低時叢發地產生許多脈衝，且其中該等叢發按一方式改變，其降低該等叢發之一平均音訊頻譜的峰值振幅超過具有一大體上固定的脈衝型樣及叢發重複率之一叢發的峰值振幅。
TW98124453A 2008-07-25 2009-07-20 諧振切換功率電路、在一諧振切換功率電路中之低功率操作方法及積體電路控制器 TWI469487B (zh)

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