TWI817460B - Power supply device - Google Patents
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Description
本發明是有關於一種電源供應裝置,且特別是有關於一種能夠在低負載條件下符合節能要求的電源供應裝置。The present invention relates to a power supply device, and in particular, to a power supply device that can meet energy saving requirements under low load conditions.
為了在降低耗能產品對環境的衝擊及影響,歐盟執行委員會節能化設計指令(2005/32/EC)制訂了一規範以規定住宅、第三級產業及工業界耗能產品的節能要求。In order to reduce the impact and impact of energy-consuming products on the environment, the European Commission's Energy-Saving Design Directive (2005/32/EC) has formulated a specification to stipulate energy-saving requirements for energy-consuming products in residential, tertiary industries and industrial sectors.
關於電源供應裝置,為了能在低負載狀態(如,閒置狀態或極輕載狀態)下達到降低損耗並節能的目的,電源供應裝置採用降頻方式(如,突衝模式(Burst mode))以降低在低負載條件下的切換損失。然而,在輸出功率較大的機種,仍會因能量較大而有著損耗下降之極限。也就是說,在低負載條件下,輸出功率在具有下降限制下,輸出功率較大的機種仍無法符合歐盟執行委員會節能化設計指令的節能要求(如Lot 7外接式電源供應器EC 278/2009)。Regarding the power supply device, in order to reduce losses and save energy in a low load state (such as idle state or very light load state), the power supply device adopts a frequency reduction method (such as burst mode) to Reduce switching losses under low load conditions. However, in models with larger output power, there is still a limit to the loss reduction due to the larger energy. That is to say, under low load conditions, the output power has a reduction limit, and models with larger output power still cannot meet the energy saving requirements of the European Commission's Energy Saving Design Directive (such as Lot 7 external power supplies EC 278/2009 ).
本發明提供一種電源供應裝置,能夠在低負載條件下符合節能要求。The invention provides a power supply device that can meet energy saving requirements under low load conditions.
本發明的電源供應裝置包括電源轉換器、控制器以及回授與補償電路。電源轉換器包括初級側電路以及次級側電路。次級側電路依據輸出電流值產生感測電壓值。控制器耦接於初級側電路。回授與補償電路耦接於次級側電路以及控制器。回授與補償電路提供回路增益。當感測電壓值大於或等於參考值時,回授與補償電路使控制器來控制初級側電路,從而使次級側電路提供輸出電壓。當感測電壓值小於參考值時,回授與補償電路使控制器對初級側電路進行降頻操作,降低回路增益以降低輸出電壓的電壓值。The power supply device of the present invention includes a power converter, a controller, and a feedback and compensation circuit. The power converter includes a primary side circuit and a secondary side circuit. The secondary side circuit generates a sensing voltage value based on the output current value. The controller is coupled to the primary side circuit. The feedback and compensation circuit is coupled to the secondary side circuit and the controller. Feedback and compensation circuitry provide loop gain. When the sensed voltage value is greater than or equal to the reference value, the feedback and compensation circuit enables the controller to control the primary side circuit, thereby causing the secondary side circuit to provide an output voltage. When the sensed voltage value is less than the reference value, the feedback and compensation circuit causes the controller to perform a frequency reduction operation on the primary side circuit, reducing the loop gain to reduce the voltage value of the output voltage.
基於上述,當感測電壓值小於參考值時,回授與補償電路降低電源供應裝置的回路增益以降低輸出電壓的電壓值。因此,輸出功率能夠被下降。如此一來,在低負載條件下,電源供應裝置能夠符合滿足現行規範的節能要求。Based on the above, when the sensed voltage value is less than the reference value, the feedback and compensation circuit reduces the loop gain of the power supply device to reduce the voltage value of the output voltage. Therefore, the output power can be reduced. In this way, under low load conditions, the power supply device can meet the energy saving requirements of current regulations.
為讓本發明的上述特徵和優點能更明顯易懂,下文特舉實施例,並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.
本發明的部份實施例接下來將會配合附圖來詳細描述,以下的描述所引用的元件符號,當不同附圖出現相同的元件符號將視為相同或相似的元件。這些實施例只是本發明的一部份,並未揭示所有本發明的可實施方式。更確切的說,這些實施例只是本發明的專利申請範圍中的範例。Some embodiments of the present invention will be described in detail with reference to the accompanying drawings. The component symbols cited in the following description will be regarded as the same or similar components when the same component symbols appear in different drawings. These embodiments are only part of the present invention and do not disclose all possible implementations of the present invention. Rather, these embodiments are only examples within the scope of the patent application of the invention.
請參考圖1,圖1是依據本發明第一實施例所繪示的電源供應裝置的示意圖。在本實施例中,電源供應裝置100包括電源轉換器CR、控制器130以及回授與補償電路140。電源轉換器CR至少包括初級側電路110、次級側電路120。控制器130耦接於初級側電路110。控制器130對初級側電路110進行控制,使得次級側電路120提供輸出電壓VO。在本實施例中,電源轉換器CR還包括變壓器TR。因此,基於控制器130的控制,變壓器TR、初級側電路110以及次級側電路120共同對輸入電壓VI進行轉換以產生輸出電壓VO。輸入電壓VI可以是被整流的電壓訊號。在本實施例中,次級側電路120還依據輸出電流值IO產生感測電壓值VS。輸出電流值IO正相關於感測電壓值VS。Please refer to FIG. 1 , which is a schematic diagram of a power supply device according to a first embodiment of the present invention. In this embodiment, the
在本實施例中,回授與補償電路140耦接於次級側電路120以及控制器130。回授與補償電路140提供回路增益LG。回授與補償電路140會接收來自於次級側電路120的感測電壓值VS,並且對感測電壓值VS進行判斷。當感測電壓值VS大於或等於參考值VR時,這表示輸出電流值IO高於一電流值準位。電源供應裝置100正在對一負載進行常規的供電。也就是說,電源供應裝置100處於供電狀態。因此,回授與補償電路140使控制器130來控制初級側電路110,從而使次級側電路120提供輸出電壓VO。In this embodiment, the feedback and
在另一方面,當感測電壓值VS小於參考值VR時,這表示輸出電流值IO低於電流值準位。電源供應裝置100停止對負載進行常規的供電。也就是說,電源供應裝置100處於低負載狀態。低負載狀態可以是閒置狀態或極輕載狀態。因此,回授與補償電路140會使控制器130對初級側電路110進行降頻操作(如,進入突衝模式)。因此,初級側電路110的切換功耗能夠被下降。此外,回授與補償電路140還降低回路增益LG以降低輸出電壓VO的電壓值。On the other hand, when the sensed voltage value VS is less than the reference value VR, it means that the output current value IO is lower than the current value level. The
在此值得一提的是,當感測電壓值VS小於參考值VR時,回授與補償電路140降低電源供應裝置100的回路增益LG以降低輸出電壓VO的電壓值。因此,輸出功率能夠大幅被下降。如此一來,在低負載狀態下,電源供應裝置100能夠符合滿足現行規範的節能要求(如Lot 7外接式電源供應器EC 278/2009)。It is worth mentioning here that when the sensed voltage value VS is less than the reference value VR, the feedback and
以本實施例為例,變壓器TR具有初級側繞組NP以及次級側繞組NS。初級側電路110耦接於初級側繞組NP。次級側電路120耦接於次級側繞組NS。初級側電路110包括激磁電感器LM以及功率開關Q1。激磁電感器LM與初級側繞組NP彼此並聯耦接。激磁電感器LM的第一端接收輸入電壓VI。功率開關Q1的第一端耦接於激磁電感器LM的第二端。功率開關Q1的第二端耦接於接地端GND1。功率開關Q1的控制端耦接於控制器130。功率開關Q1的控制端接收控制器130所提供的切換控制訊號GD。次級側電路120包括輸出二極體DO、輸出電容器CO以及感測電阻器RS。輸出二極體DO的陽極耦接於次級側繞組NS的第一端。輸出二極體DO的陰極作為次級側電路120的輸出端。輸出電容器CO的第一端耦接於輸出二極體DO的陰極。感測電阻器RS耦接於輸出電容器CO的第二端與接地端GND2之間。次級側電路120會將流經感測電阻器RS的輸出電流的輸出電流值IO轉換為感測電壓值VS。Taking this embodiment as an example, the transformer TR has a primary side winding NP and a secondary side winding NS. The
本實施例的電源轉換器CR以具有變壓器TR的反馳式(flyback)轉換器,然本發明並不以此為限。在一些實施例中,電源轉換器CR可以是LLC轉換器。在一些實施例中,電源轉換器CR可以是非隔離式轉換器,如Buck-Boost轉換器。The power converter CR in this embodiment is a flyback converter with a transformer TR, but the invention is not limited thereto. In some embodiments, power converter CR may be an LLC converter. In some embodiments, the power converter CR may be a non-isolated converter, such as a Buck-Boost converter.
請參考圖2,圖2是依據本發明第二實施例所繪示的電源供應裝置的示意圖。在本實施例中,電源供應裝置200包括電源轉換器CR、控制器130以及回授與補償電路240。電源供應裝置100包括電源轉換器CR、控制器130以及回授與補償電路240。電源轉換器CR至少包括變壓器TR、初級側電路110、次級側電路120。回授與補償電路240包括回授電路241與判斷電路242。回授電路241依據輸出電壓VO的電壓值來提供回授訊號SFB。控制器130依據回授訊號SFB調節控制訊號GD的頻率。因此,在供電狀態中,輸出電壓VO的電壓值得以被穩定。Please refer to FIG. 2 , which is a schematic diagram of a power supply device according to a second embodiment of the present invention. In this embodiment, the
判斷電路242對感測電壓值VS與參考值VR進行比較,當感測電壓值VS大於或等於參考值VR時,判斷電路242並不會降低回授與補償電路240內部的回路增益(如圖1所示的回路增益LG)。此外,輸出電壓VO的電壓值會被穩定。The
在另一方面,當感測電壓值VS小於參考值VR時,判斷電路242會降低回授與補償電路240內部的回路增益。因此,輸出電壓VO會被降低。此外,當感測電壓值VS小於參考值VR時,判斷電路242還指示控制器130對初級側電路110進行降頻操作。On the other hand, when the sensed voltage value VS is less than the reference value VR, the
在本實施例中,回授電路241包括耦合電路2411、穩壓器2412、電阻器R1、分壓電阻器RB以及第一補償電路2413。耦合電路2411耦接於控制器130與次級側電路120之間。穩壓器2412的第一端耦接於耦合電路2411。穩壓器2412的第二端耦接於次級側電路120的參考低電壓(例如是接地端GND2)。穩壓器2412的參考端用以提供參考值VR。穩壓器2412依據輸出電壓VO的變化使耦合電路2411提供對應的回授訊號SFB。電阻器R1耦接於次級側電路120的輸出端與穩壓器2412的參考端之間。分壓電阻器RB耦接於穩壓器2412的參考端與穩壓器2412的第二端之間。In this embodiment, the
在本實施例中,耦合電路2411可以是由光耦合器(如,元件PC817)來實現。穩壓器2412可以是由元件TL431來實現。耦合電路2411包括發光二極體以及耦合電晶體。發光二極體的陽極耦接於輸出電壓VO。發光二極體的陰極耦接於穩壓器2412的第一端。耦合電晶體耦接於控制器130與接地端GND1之間。在本實施例中,電阻器R1以及分壓電阻器RB會對輸出電壓VO的電壓值進行分壓以獲得輸出電壓VO的分壓值。穩壓器2412會接收分壓值並且將分壓值與參考值VR進行比較。當分壓值與參考值VR不相同時,穩壓器2412的第一端的電壓值會發生變化,進而影響發光二極體的發光結果。因此,耦合電晶體所產生的回授訊號SFB也會發生改變。舉例來說,當輸出電壓VO的電壓值上升時,穩壓器2412所接收到的分壓值會上升。因此,穩壓器2412的第一端的電壓值會被對應地降低。發光二極體的亮度會上升。因此,耦合電晶體所提供的回授訊號SFB的電流值會上升。進而影像回授與補償電路240內的電容器CB的充電結果。控制器130會依據電容器CB的充電結果來降低切換控制訊號GD的工作週期。因此,輸出電壓VO的電壓值會被下降。相似地,當輸出電壓VO的電壓值下降時,控制器130會上升切換控制訊號GD的工作週期。因此,輸出電壓VO的電壓值會被上升。因此,在供電狀態中,輸出電壓VO的電壓值能夠被穩定。In this embodiment, the
在本實施例中,第一補償電路2413耦接於穩壓器2412的第一端與穩壓器2412的參考端之間。在本實施例中,第一補償電路2413與電阻器R1決定出第一極點。此外,第一補償電路2413獨自決定出第二極點以及第一零點。應注意的是,在供電狀態中,第一補償電路2413增加了頻寬以及相位裕度(phase margin)。In this embodiment, the
在本實施例中,判斷電路242會對感測電壓值VS進行判斷。當感測電壓值VS大於或等於參考值VR時,判斷電路242會獲知電源供應裝置200處於供電狀態。因此,在供電狀態中,判斷電路242並不會建立第二補償電路。在另一方面,當感測電壓值VS小於參考值VR時,判斷電路242會獲知電源供應裝置200處於低負載狀態。因此,判斷電路242會建立第二補償電路。In this embodiment, the
應注意的是,第二補償電路與電阻器R1決定出第二零點。第二補償電路獨自決定出第三極點。因此,在低負載狀態中,第一補償電路2413與第二補償電路共同提供了3個極點以及2零點。第一補償電路2413與第二補償電路進一步增加了頻寬。此外,第一補償電路2413與第二補償電路還能夠降低回路增益。It should be noted that the second compensation circuit and resistor R1 determine the second zero point. The second compensation circuit alone determines the third pole. Therefore, in the low load state, the
請同時參考圖2、圖3、圖4以及圖5,圖3是依據本發明一實施例所繪示的切換控制訊號以及輸出電壓的波形圖。圖4是依據本發明一實施例所繪示的供電狀態的回路增益示意圖。圖5是依據本發明一實施例所繪示的低負載狀態的回路增益示意圖。在本實施例中,第一補償電路2413包括電容器C1、C2以及電阻器R2。電容器C1耦接於穩壓器2412的第一端與穩壓器2412的參考端之間。電容器C2與電阻器R2串聯耦接於穩壓器2412的第一端與穩壓器2412的參考端之間。基於公式(1)、公式(2)以及公式(3),電容器C1的電容值與電阻器R1的電阻值決定出第一極點f0。電容器C2的電容值與電阻器R2的電阻值決定出第一零點f1。電容器C1的電容值與電阻器R2的電阻值決定出第二極點f2。Please refer to FIG. 2 , FIG. 3 , FIG. 4 and FIG. 5 at the same time. FIG. 3 is a waveform diagram of a switching control signal and an output voltage according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a loop gain in a power supply state according to an embodiment of the present invention. FIG. 5 is a schematic diagram of the loop gain in a low load state according to an embodiment of the present invention. In this embodiment, the
………….……公式(1) ………….……Formula 1)
………….……公式(2) ………….……Formula (2)
………….……公式(3) ………….……Formula (3)
rR1是電阻器R1的電阻值。rR2是電阻器R2的電阻值。cC1是電容器C1的電容值。cC2是電容器C2的電容值。在本實施例中,第一零點f1的頻率被設計以大於第一極點f0的頻率。第二極點f2的頻率被設計以大於第一零點f1的頻率。rR1 is the resistance value of resistor R1. rR2 is the resistance value of resistor R2. cC1 is the capacitance value of capacitor C1. cC2 is the capacitance value of capacitor C2. In this embodiment, the frequency of the first zero point f1 is designed to be greater than the frequency of the first pole f0. The frequency of the second pole f2 is designed to be greater than the frequency of the first zero point f1.
判斷電路242包括比較器CP、開關Q2、Q3、輔助電阻器R3以及輔助電容器C3。比較器CP的非反相輸入端耦接於穩壓器2412的參考端。比較器CP的非反相輸入端接收感測電壓值VS。開關Q2的第一端耦接於次級側電路120的輸出端。開關Q2的控制端耦接於比較器CP的輸出端。輔助電阻器R3耦接於穩壓器2412的參考端與開關Q2的第二端之間。開關Q3的第一端耦接於次級側電路120的輸出端。開關Q3的控制端耦接於比較器CP的輸出端。輔助電容器C3耦接於穩壓器2412的參考端與開關Q3的第二端之間。The
在本實施例中,在供電狀態ST1,控制器130會提供具有一操作頻率範圍的切換控制訊號GD。為了穩定輸出電壓VO的電壓值,切換控制訊號GD的切換頻率被調整於操作頻率範圍中。在供電狀態ST1,輸出電流值IO會較高。因此,感測電壓值VS會大於或等於參考值VR。當感測電壓值VS大於或等於參考值VR時,比較器CP會提供低電壓訊號以斷開開關Q2、Q3。因此,回授與補償電路240會提供回路增益LG1。輸出電壓VO的電壓值會基於回路增益LG1的增益值AV1被增益。增益值AV1大致上等於電阻器R2的電阻值除以電阻器R1的電阻值所獲得的第一商。In this embodiment, in the power supply state ST1, the
在低負載狀態ST2中,輸出電流值IO會下降。因此,感測電壓值VS會小於參考值VR。當感測電壓值VS小於參考值VR時,比較器CP會提供高電壓訊號以使控制器130對初級側電路110進行降頻操作。因此,切換控制訊號GD的切換頻率會被降低。在低負載狀態ST2中,切換控制訊號GD的切換頻率會低於操作頻率範圍中的最低頻率。In the low load state ST2, the output current value IO will decrease. Therefore, the sensing voltage value VS will be smaller than the reference value VR. When the sensed voltage value VS is less than the reference value VR, the comparator CP provides a high voltage signal so that the
此外,比較器CP還利用高電壓訊號以導通開關Q2、Q3。因此,比較器CP使輔助電阻器R3與輔助電容器C3被建立為第二補償電路。In addition, the comparator CP also uses the high voltage signal to turn on the switches Q2 and Q3. Therefore, the comparator CP causes the auxiliary resistor R3 and the auxiliary capacitor C3 to be established as the second compensation circuit.
基於公式(4)以及公式(5),輔助電容器C3的電容值與第一電阻器R1的電阻值決定第二零點f3。輔助電阻器R3的電阻值與輔助電容器C3的電容值決定第三極點f4。Based on formula (4) and formula (5), the capacitance value of the auxiliary capacitor C3 and the resistance value of the first resistor R1 determine the second zero point f3. The resistance value of the auxiliary resistor R3 and the capacitance value of the auxiliary capacitor C3 determine the third pole f4.
………….……公式(4) ………….……Formula (4)
………….……公式(5) ………….……Formula (5)
cC3是輔助電容器C3的電容值。rR3是輔助電阻器R3的電阻值。在本實施例中,第二零點f3的頻率被設計以大於第二極點f2的頻率。第三極點f4的頻率被設計以大於第二零點f3的頻率。因此,在低負載狀態ST2中,回授與補償電路240會提供回路增益LG2。回路增益LG2的增益值AV2低於增益值AV1。因此,輸出電壓VO的電壓值會基於回路增益LG2的增益值AV2被降低。在本實施例中,增益值AV2大致上等於輔助電容器C3的電容值除以電容器C2的電容值所獲得的第二商。cC3 is the capacitance value of auxiliary capacitor C3. rR3 is the resistance value of auxiliary resistor R3. In this embodiment, the frequency of the second zero point f3 is designed to be greater than the frequency of the second pole f2. The frequency of the third pole f4 is designed to be greater than the frequency of the second zero point f3. Therefore, in the low load state ST2, the feedback and
舉例來說,電源供應裝置200應用於筆記型電腦,在供電狀態ST1,輸出電壓VO的電壓值約為19伏特。輸出電流值IO約為4.74安培。在低負載狀態ST2中,輸出電流值IO低於1安培,使得關聯於輸出電流值IO的感測電壓值VS小於參考值VR。控制器130對初級側電路110進行降頻操作。因此,初級側電路110的切換功耗能夠被下降。此外,第二補償電路被建立以降低回路增益。輸出電壓VO的電壓值被降低10伏特。因此,電源供應裝置200的輸出功率能夠大幅被下降。當電源供應裝置200回到供電狀態ST1時,感測電壓值VS會大於或等於參考值VR。因此,控制器130停止對初級側電路110進行降頻操作。此外,第二補償電路不會被建立。輸出電壓VO的電壓值則會回到19伏特。For example, the
綜上所述,當感測電壓值小於參考值時,電源供應裝置的回路增益被降低,輸出電壓的電壓值被降低。因此,輸出功率能夠被大幅下降。如此一來,在低負載條件下,電源供應裝置能夠符合滿足現行規範的節能要求。In summary, when the sensed voltage value is less than the reference value, the loop gain of the power supply device is reduced and the voltage value of the output voltage is reduced. Therefore, the output power can be significantly reduced. In this way, under low load conditions, the power supply device can meet the energy saving requirements of current regulations.
雖然本發明已以實施例揭露如上,然其並非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明的精神和範圍內,當可作些許的更動與潤飾,故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the appended patent application scope.
100、200:電源供應裝置100, 200: Power supply device
110:初級側電路110: Primary side circuit
120:次級側電路120:Secondary side circuit
130:控制器130:Controller
140、240:回授與補償電路140, 240: Feedback and compensation circuit
241:回授電路241:Feedback circuit
2411:耦合電路2411: Coupling circuit
2412:穩壓器2412: Voltage regulator
2413:第一補償電路2413: First compensation circuit
242:判斷電路242:Judgement circuit
AV1、AV2:增益值AV1, AV2: gain value
C1、C2、CB:電容器C1, C2, CB: capacitor
CO:輸出電容器CO: output capacitor
C3:輔助電容器C3: Auxiliary capacitor
CP:比較器CP: Comparator
CR:電源轉換器CR: power converter
DO:輸出二極體DO: output diode
f0:第一極點f0: first pole
f1:第一零點f1: first zero point
f2:第二極點f2: second pole
f3:第二零點f3: second zero point
f4:第三極點f4: third pole
GD:切換控制訊號GD: switching control signal
GND1、GND2:接地端GND1, GND2: ground terminal
IO:輸出電流值IO: output current value
LG、LG1、LG2:回路增益LG, LG1, LG2: loop gain
LM:激磁電感器LM: Magnetizing inductor
NP:初級側繞組NP: primary side winding
NS:次級側繞組NS: secondary side winding
Q1:功率開關Q1: Power switch
Q2、Q3:開關Q2, Q3: switch
R1、R2:電阻器R1, R2: resistor
R3:輔助電阻器R3: Auxiliary resistor
RB:分壓電阻器RB: voltage dividing resistor
RS:感測電阻器RS: sensing resistor
SFB:回授訊號SFB: feedback signal
ST1:供電狀態ST1: power supply status
ST2:低負載狀態ST2: low load state
t:時間t: time
TR:變壓器TR: Transformer
VI:輸入電壓VI: input voltage
VO:輸出電壓VO: output voltage
VS:感測電壓值VS: sensing voltage value
VR:參考值VR: reference value
圖1是依據本發明第一實施例所繪示的電源供應裝置的示意圖。 圖2是依據本發明第二實施例所繪示的電源供應裝置的示意圖。 圖3是依據本發明一實施例所繪示的切換控制訊號以及輸出電壓的波形圖。 圖4是依據本發明一實施例所繪示的供電狀態的回路增益示意圖。 圖5是依據本發明一實施例所繪示的低負載狀態的回路增益示意圖。 FIG. 1 is a schematic diagram of a power supply device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of a power supply device according to a second embodiment of the present invention. FIG. 3 is a waveform diagram of a switching control signal and an output voltage according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a loop gain in a power supply state according to an embodiment of the present invention. FIG. 5 is a schematic diagram of the loop gain in a low load state according to an embodiment of the present invention.
100:電源供應裝置 100:Power supply device
110:初級側電路 110: Primary side circuit
120:次級側電路 120:Secondary side circuit
130:控制器 130:Controller
140:回授與補償電路 140: Feedback and compensation circuit
CO:輸出電容器 CO: output capacitor
CR:電源轉換器 CR: power converter
DO:輸出二極體 DO: output diode
GD:切換控制訊號 GD: switching control signal
GND1、GND2:接地端 GND1, GND2: ground terminal
IO:輸出電流值 IO: output current value
LG:回路增益 LG: loop gain
LM:激磁電感器 LM: Magnetizing inductor
NP:初級側繞組 NP: primary side winding
NS:次級側繞組 NS: secondary side winding
Q1:功率開關 Q1: Power switch
RS:感測電阻器 RS: sensing resistor
TR:變壓器 TR: Transformer
VI:輸入電壓 VI: input voltage
VO:輸出電壓 VO: output voltage
VS:感測電壓值 VS: sensing voltage value
VR:參考值 VR: reference value
Claims (10)
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Citations (5)
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US20150381054A1 (en) * | 2014-06-26 | 2015-12-31 | Hong Kong Applied Science & Technology Research Institute Company Limited | LED Driver with Small Output Ripple Without Requiring a High-Voltage Primary-Side Electrolytic Capacitor |
TWI610526B (en) * | 2015-03-27 | 2018-01-01 | 通嘉科技股份有限公司 | Controller of a power converter and operation method thereof |
US20190326811A1 (en) * | 2018-04-24 | 2019-10-24 | Shanghai Tuituo Technology Co., Ltd | Dual-rectification full bridge interleaved single stage pfc converter circuit and control methods thereof |
CN112290810A (en) * | 2020-10-19 | 2021-01-29 | 苏州浪潮智能科技有限公司 | Circuit for realizing power saving of power supply and power supply method |
CN109478846B (en) * | 2016-05-13 | 2021-02-02 | 斯兰纳亚洲有限公司 | Power converter with robust stable feedback |
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US20150381054A1 (en) * | 2014-06-26 | 2015-12-31 | Hong Kong Applied Science & Technology Research Institute Company Limited | LED Driver with Small Output Ripple Without Requiring a High-Voltage Primary-Side Electrolytic Capacitor |
TWI610526B (en) * | 2015-03-27 | 2018-01-01 | 通嘉科技股份有限公司 | Controller of a power converter and operation method thereof |
CN109478846B (en) * | 2016-05-13 | 2021-02-02 | 斯兰纳亚洲有限公司 | Power converter with robust stable feedback |
US20190326811A1 (en) * | 2018-04-24 | 2019-10-24 | Shanghai Tuituo Technology Co., Ltd | Dual-rectification full bridge interleaved single stage pfc converter circuit and control methods thereof |
CN112290810A (en) * | 2020-10-19 | 2021-01-29 | 苏州浪潮智能科技有限公司 | Circuit for realizing power saving of power supply and power supply method |
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