TWI663824B - Power conversion device - Google Patents
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- TWI663824B TWI663824B TW106139742A TW106139742A TWI663824B TW I663824 B TWI663824 B TW I663824B TW 106139742 A TW106139742 A TW 106139742A TW 106139742 A TW106139742 A TW 106139742A TW I663824 B TWI663824 B TW I663824B
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Abstract
一種電源轉換裝置,包括轉換電路、切換電路、儲能元件與偵測電路。轉換電路包括變壓器、輸出電容與輸出端。變壓器的一次側接收輸入電壓,且輸出電容電性連接在輸出端與接地端之間。切換電路與儲能元件串聯在輸出端與接地端之間。當輸入電壓被供應時,轉換電路轉換輸入電壓並透過輸出電容產生電源電壓,且偵測電路不導通切換電路並對儲能元件進行充電。當輸入電壓不被供應時,偵測電路導通切換電路,且輸出電容與儲能元件供應電源電壓一維持時間。A power conversion device includes a conversion circuit, a switching circuit, an energy storage element, and a detection circuit. The conversion circuit includes a transformer, an output capacitor, and an output terminal. The primary side of the transformer receives the input voltage, and the output capacitor is electrically connected between the output terminal and the ground terminal. The switching circuit and the energy storage element are connected in series between the output terminal and the ground terminal. When the input voltage is supplied, the conversion circuit converts the input voltage and generates a power supply voltage through the output capacitor, and the detection circuit does not conduct the switching circuit and charges the energy storage element. When the input voltage is not supplied, the detection circuit turns on the switching circuit, and the output capacitor and the power supply voltage of the energy storage element provide a hold time.
Description
本發明是有關於一種電源轉換技術,且特別是有關於一種電源轉換裝置。 The present invention relates to a power conversion technology, and more particularly, to a power conversion device.
一般而言,電子設備設有電源轉換裝置,以藉此供應穩定的電源電壓。此外,當電源轉換裝置突然被斷電時,電源轉換裝置可在一維持時間(hold-up time)內持續地輸出電源電壓,以避免瞬間斷電對電子設備所造成的影響。然而,在長時間處於高溫的情況下,電源轉換裝置中之輸出電容所儲存的能量也跟著降低。隨著輸出電容之儲存能量的降低,電源轉換裝置的維持時間也相對應地縮短。因此,現有的電源轉換裝置往往具有維持時間不足的問題,進而降低電子設備的穩定性。 Generally speaking, electronic equipment is provided with a power conversion device to supply a stable power supply voltage. In addition, when the power conversion device is suddenly powered off, the power conversion device can continuously output the power supply voltage for a hold-up time to avoid the impact of the instant power failure on the electronic equipment. However, under high temperature for a long time, the energy stored in the output capacitor of the power conversion device also decreases. As the stored energy of the output capacitor is reduced, the holding time of the power conversion device is correspondingly shortened. Therefore, the conventional power conversion device often has a problem of insufficient holding time, thereby reducing the stability of the electronic equipment.
本發明提供一種電源轉換裝置,可改善維持時間不足的問題。 The invention provides a power conversion device, which can improve the problem of insufficient maintenance time.
本發明的電源轉換裝置,包括轉換電路、切換電路、儲 能元件與偵測電路。轉換電路包括變壓器、輸出電容與輸出端。變壓器的一次側接收輸入電壓,且輸出電容電性連接在輸出端與接地端之間。切換電路與儲能元件串聯在輸出端與接地端之間。偵測電路電性連接變壓器的二次側、切換電路與儲能元件。當輸入電壓被供應時,轉換電路轉換輸入電壓並透過輸出電容產生電源電壓,且偵測電路不導通切換電路並對儲能元件進行充電。當輸入電壓不被供應時,偵測電路導通切換電路,且輸出電容與儲能元件在維持時間內供應電源電壓。 The power conversion device of the present invention includes a conversion circuit, a switching circuit, and a storage circuit. Functional components and detection circuits. The conversion circuit includes a transformer, an output capacitor, and an output terminal. The primary side of the transformer receives the input voltage, and the output capacitor is electrically connected between the output terminal and the ground terminal. The switching circuit and the energy storage element are connected in series between the output terminal and the ground terminal. The detection circuit is electrically connected to the secondary side of the transformer, the switching circuit and the energy storage element. When the input voltage is supplied, the conversion circuit converts the input voltage and generates a power supply voltage through the output capacitor, and the detection circuit does not conduct the switching circuit and charges the energy storage element. When the input voltage is not supplied, the detection circuit turns on the switching circuit, and the output capacitor and the energy storage element supply the power voltage during the maintenance time.
在本發明的一實施例中,上述的轉換電路更包括第一開關、第一二極體與第一電阻。第一開關電性連接變壓器的一次側。第一二極體的陽極電性連接變壓器的二次側。第一電阻電性連接在第一二極體的陰極與輸出端之間。 In an embodiment of the present invention, the conversion circuit further includes a first switch, a first diode, and a first resistor. The first switch is electrically connected to the primary side of the transformer. The anode of the first diode is electrically connected to the secondary side of the transformer. The first resistor is electrically connected between the cathode of the first diode and the output terminal.
在本發明的一實施例中,上述的切換電路包括第二二極體與第二開關。第二二極體的陰極電性連接輸出端。第二開關電性連接在第二二極體的陽極與儲能元件之間。 In an embodiment of the present invention, the switching circuit includes a second diode and a second switch. The cathode of the second diode is electrically connected to the output terminal. The second switch is electrically connected between the anode of the second diode and the energy storage element.
基於上述,本發明的電源轉換裝置可在輸入電壓被供應時對儲能元件進行充電。此外,當輸入電壓不被供應時,電源轉換裝置可透過輸出電容與儲能元件供應電源電壓。藉此,將可延長電源轉換裝置的維持時間。 Based on the above, the power conversion device of the present invention can charge the energy storage element when an input voltage is supplied. In addition, when the input voltage is not supplied, the power conversion device can supply the power voltage through the output capacitor and the energy storage element. Thereby, the maintenance time of the power conversion device can be extended.
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 features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.
100、200‧‧‧電源轉換裝置 100, 200‧‧‧ power conversion device
110‧‧‧轉換電路 110‧‧‧ conversion circuit
111‧‧‧輸入端 111‧‧‧input
112‧‧‧輸出端 112‧‧‧output
SW1‧‧‧第一開關 SW1‧‧‧The first switch
T1‧‧‧變壓器 T1‧‧‧Transformer
D1‧‧‧第一二極體 D1‧‧‧First Diode
R1‧‧‧第一電阻 R1‧‧‧first resistor
C1‧‧‧輸出電容 C1‧‧‧ output capacitor
S1‧‧‧控制訊號 S1‧‧‧Control signal
120、220‧‧‧切換電路 120, 220‧‧‧switching circuit
D2‧‧‧第二二極體 D2‧‧‧Second Diode
SW2‧‧‧第二開關 SW2‧‧‧Second switch
130‧‧‧儲能元件 130‧‧‧energy storage element
C2‧‧‧輔助電容 C2‧‧‧ auxiliary capacitor
140、240‧‧‧偵測電路 140, 240‧‧‧ detection circuit
141‧‧‧比較器 141‧‧‧ Comparator
D3‧‧‧第三二極體 D3‧‧‧ third diode
VI‧‧‧輸入電壓 VI‧‧‧Input voltage
VO‧‧‧電源電壓 VO‧‧‧ Power supply voltage
101‧‧‧負載 101‧‧‧load
241‧‧‧放大電路 241‧‧‧amplification circuit
R2‧‧‧第二電阻 R2‧‧‧Second resistor
R3‧‧‧第三電阻 R3‧‧‧Third resistor
圖1是依照本發明一實施例的電源轉換裝置的示意圖。 FIG. 1 is a schematic diagram of a power conversion device according to an embodiment of the invention.
圖2是依照本發明另一實施例的電源轉換裝置的示意圖。 FIG. 2 is a schematic diagram of a power conversion device according to another embodiment of the present invention.
圖1是依照本發明一實施例的電源轉換裝置的示意圖。如圖1所示,電源轉換裝置100包括轉換電路110、切換電路120、儲能元件130與偵測電路140。其中,轉換電路110具有輸入端111與輸出端112,並包括變壓器T1與輸出電容C1。變壓器T1的一次側電性連接轉換電路110的輸入端111,以接收輸入電壓VI。輸出電容C1電性連接在轉換電路110的輸出端112與接地端之間,並可用以產生電源電壓VO。 FIG. 1 is a schematic diagram of a power conversion device according to an embodiment of the invention. As shown in FIG. 1, the power conversion device 100 includes a conversion circuit 110, a switching circuit 120, an energy storage element 130, and a detection circuit 140. The conversion circuit 110 has an input terminal 111 and an output terminal 112, and includes a transformer T1 and an output capacitor C1. The primary side of the transformer T1 is electrically connected to the input terminal 111 of the conversion circuit 110 to receive the input voltage VI. The output capacitor C1 is electrically connected between the output terminal 112 and the ground terminal of the conversion circuit 110 and can be used to generate a power supply voltage VO.
切換電路120與儲能元件130串聯在轉換電路110的輸出端112與接地端之間。偵測電路140電性連接變壓器T1的二次側、切換電路120與儲能元件130。在操作上,當輸入電壓VI被供應時,亦即當轉換電路110可接收到輸入電壓VI時,轉換電路110可轉換輸入電壓VI並可透過輸出電容C1產生電源電壓VO,且偵測電路140可不導通切換電路120並對儲能元件130進行充電。當輸入電壓VI不被供應時,亦即當轉換電路110無法接收到輸入電壓VI時,偵測電路140可導通切換電路120,且輸出電容C1與儲能元件130可在維持時間(hold-up time)內供應電源電壓 VO。 The switching circuit 120 and the energy storage element 130 are connected in series between the output terminal 112 and the ground terminal of the conversion circuit 110. The detection circuit 140 is electrically connected to the secondary side of the transformer T1, the switching circuit 120, and the energy storage element 130. In operation, when the input voltage VI is supplied, that is, when the conversion circuit 110 can receive the input voltage VI, the conversion circuit 110 can convert the input voltage VI and generate the power supply voltage VO through the output capacitor C1, and the detection circuit 140 The switching circuit 120 may not be turned on and the energy storage element 130 may be charged. When the input voltage VI is not supplied, that is, when the conversion circuit 110 cannot receive the input voltage VI, the detection circuit 140 can turn on the switching circuit 120, and the output capacitor C1 and the energy storage element 130 can be held-up time) supply voltage VO.
換言之,當外部電源正常供電至電源轉換裝置100時,電源轉換裝置100可將能量預先儲存在儲能元件130中。當電源轉換裝置100突然被斷電時,電源轉換裝置100可透過輸出電容C1與儲能元件130持續地提供電源電壓VO長達一維持時間。值得一提的是,現有的電源轉換裝置僅能在斷電時利用輸出電容持續地輸出電源電壓。因此,與現有的電源轉換裝置相較之下,電源轉換裝置100可利用預先儲存在儲能元件130的能量來有效地延長維持時間,從而有助於提升設有電源轉換裝置100之電子設備的穩定性。 In other words, when an external power source normally supplies power to the power conversion device 100, the power conversion device 100 may store energy in the energy storage element 130 in advance. When the power conversion device 100 is suddenly powered off, the power conversion device 100 can continuously provide the power supply voltage VO through the output capacitor C1 and the energy storage element 130 for a maintenance time. It is worth mentioning that the existing power conversion device can only continuously output the power supply voltage by using the output capacitor when the power is turned off. Therefore, compared with the existing power conversion device, the power conversion device 100 can use the energy stored in the energy storage element 130 in advance to effectively extend the maintenance time, thereby helping to improve the performance of electronic equipment provided with the power conversion device 100. stability.
請繼續參照圖1,轉換電路110可例如是返馳式轉換器(flyback converter),且轉換電路110更包括第一開關SW1、第一二極體D1與第一電阻R1。其中,第一開關SW1電性連接變壓器T1的一次側。第一二極體D1的陽極電性連接變壓器T1的二次側。第一電阻R1電性連接在第一二極體D1的陰極與轉換電路110的輸出端112之間。第一開關SW1受控於控制訊號S1,以被切換至導通或是不導通的狀態。隨著第一開關SW1之狀態的改變,流經變壓器T1的電流將產生相對地改變,進而致使輸出電容C1可進行充電與放電。藉此,轉換電路110將可響應於第一開關SW1的切換而將輸入電壓VI轉換成電源電壓VO。 Please continue to refer to FIG. 1, the conversion circuit 110 may be, for example, a flyback converter, and the conversion circuit 110 further includes a first switch SW1, a first diode D1, and a first resistor R1. The first switch SW1 is electrically connected to the primary side of the transformer T1. The anode of the first diode D1 is electrically connected to the secondary side of the transformer T1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the output terminal 112 of the conversion circuit 110. The first switch SW1 is controlled by the control signal S1 to be switched to a conductive or non-conductive state. As the state of the first switch SW1 changes, the current flowing through the transformer T1 will be relatively changed, thereby causing the output capacitor C1 to be charged and discharged. Thereby, the conversion circuit 110 can convert the input voltage VI into the power supply voltage VO in response to the switching of the first switch SW1.
切換電路120包括第二二極體D2與第二開關SW2。其中,第二二極體D2的陰極電性連接轉換電路110的輸出端112。 第二開關SW2電性連接在第二二極體D2的陽極與儲能元件130之間。偵測電路140包括比較器141與第三二極體D3。其中,比較器141的反相輸入端電性連接第一電阻R1的第一端與第一二極體D1的陰極,比較器141的正相輸入端電性連接第一電阻R1的第二端,且比較器141的輸出端電性連接第二開關SW2的控制端。第三二極體D3的陽極電性連接變壓器T1的二次側,且第三二極體D3的陰極電性連接儲能元件130。此外,儲能元件130可由輔助電容C2所構成。其中,輔助電容C2的第一端電性連接第二開關SW2與第三二極體D3的陰極,且輔助電容C2的第二端電性連接至接地端。 The switching circuit 120 includes a second diode D2 and a second switch SW2. The cathode of the second diode D2 is electrically connected to the output terminal 112 of the conversion circuit 110. The second switch SW2 is electrically connected between the anode of the second diode D2 and the energy storage element 130. The detection circuit 140 includes a comparator 141 and a third diode D3. The inverting input terminal of the comparator 141 is electrically connected to the first terminal of the first resistor R1 and the cathode of the first diode D1, and the non-inverting input terminal of the comparator 141 is electrically connected to the second terminal of the first resistor R1. The output terminal of the comparator 141 is electrically connected to the control terminal of the second switch SW2. The anode of the third diode D3 is electrically connected to the secondary side of the transformer T1, and the cathode of the third diode D3 is electrically connected to the energy storage element 130. In addition, the energy storage element 130 may be composed of an auxiliary capacitor C2. The first terminal of the auxiliary capacitor C2 is electrically connected to the cathode of the second switch SW2 and the third diode D3, and the second terminal of the auxiliary capacitor C2 is electrically connected to the ground terminal.
在操作上,當輸入電壓VI供應至轉換電路110,且轉換電路110依據控制訊號S1導通第一開關SW1時,第一二極體D1處於逆向偏壓而不被導通,且輸出電容C1對負載101進行放電。此外,切換電路120與偵測電路140停止操作。 In operation, when the input voltage VI is supplied to the conversion circuit 110 and the conversion circuit 110 turns on the first switch SW1 according to the control signal S1, the first diode D1 is in a reverse bias and is not turned on, and the output capacitor C1 is connected to the load 101 is discharged. In addition, the switching circuit 120 and the detection circuit 140 stop operating.
當輸入電壓VI供應至轉換電路110,且轉換電路110依據控制訊號S1不導通第一開關SW1時,第一二極體D1處於順向偏壓而被導通,進而致使變壓器T1之二次側的電流可對輸出電容C1進行充電並提供能量至負載101。此外,第三二極體D3處於順向偏壓而被導通,進而致使偵測電路140可對儲能元件130(例如,輔助電容C2)進行充電。再者,比較器141之正相輸入端的電壓小於其反相輸入端的電壓,因此比較器141可產生低準位電壓,進而可不導通第二開關SW2。換言之,當輸入電壓VI被供應,且第 一開關SW1不導通時,偵測電路140不導通第二開關SW2,並可對儲能元件130進行充電。 When the input voltage VI is supplied to the conversion circuit 110 and the conversion circuit 110 does not turn on the first switch SW1 according to the control signal S1, the first diode D1 is turned on in a forward bias voltage, thereby causing the secondary side of the transformer T1 The current can charge the output capacitor C1 and provide energy to the load 101. In addition, the third diode D3 is turned on under a forward bias, thereby causing the detection circuit 140 to charge the energy storage element 130 (for example, the auxiliary capacitor C2). Furthermore, the voltage at the non-inverting input terminal of the comparator 141 is smaller than the voltage at its inverting input terminal. Therefore, the comparator 141 can generate a low level voltage, and thus the second switch SW2 cannot be turned on. In other words, when the input voltage VI is supplied and the first When one switch SW1 is not turned on, the detection circuit 140 does not turn on the second switch SW2 and can charge the energy storage element 130.
當輸入電壓VI停止供應至轉換電路110時,亦即當電源轉換裝置100突然被斷電時,儲存在變壓器T1的剩餘能量以及轉換電路110中的寄生電容可致使比較器141的反相輸入端維持在較低的電壓準位。此時,比較器141之正相輸入端的電壓將大於其反相輸入端的電壓,故比較器141可產生高準位電壓,進而可導通第二開關SW2。換言之,當輸入電壓VI不被供應時,偵測電路140可在維持時間內導通第二開關SW2。隨著第二開關SW2的導通,儲能元件130所儲存的能量將可透過第二開關SW2與第二二極體D2傳送至負載101。藉此,在電源轉換裝置100被斷電後的維持時間內,輸出電容C1與儲能元件130將可持續地供應電源電壓VO至負載101。 When the input voltage VI stops being supplied to the conversion circuit 110, that is, when the power conversion device 100 is suddenly powered off, the residual energy stored in the transformer T1 and the parasitic capacitance in the conversion circuit 110 may cause the inverting input terminal of the comparator 141 Maintained at a lower voltage level. At this time, the voltage at the non-inverting input terminal of the comparator 141 will be greater than the voltage at its inverting input terminal, so the comparator 141 can generate a high-level voltage, and then the second switch SW2 can be turned on. In other words, when the input voltage VI is not supplied, the detection circuit 140 may turn on the second switch SW2 during the sustaining time. As the second switch SW2 is turned on, the energy stored in the energy storage element 130 can be transmitted to the load 101 through the second switch SW2 and the second diode D2. Thereby, during the maintaining time after the power conversion device 100 is powered off, the output capacitor C1 and the energy storage element 130 will continuously supply the power supply voltage VO to the load 101.
圖2是依照本發明另一實施例的電源轉換裝置的示意圖。與圖1實施例相較之下,圖2之電源轉換裝置200中的切換電路220更包括第二電阻R2,且電源轉換裝置200中的偵測電路240更包括放大電路241與第三電阻R3。 FIG. 2 is a schematic diagram of a power conversion device according to another embodiment of the present invention. Compared with the embodiment of FIG. 1, the switching circuit 220 in the power conversion device 200 of FIG. 2 further includes a second resistor R2, and the detection circuit 240 in the power conversion device 200 further includes an amplifier circuit 241 and a third resistor R3 .
具體而言,第二電阻R2與第二二極體D2串聯在轉換電路110的輸出端112與第二開關SW2之間,以藉此降低流經第二二極體D2的電流。放大電路241電性連接在比較器141的輸出端與第二開關SW2的控制端之間,以藉此放大比較器141的輸出電壓。第三電阻R3電性連接在放大電路241與第二開關SW2的控 制端之間,以藉此降低傳送至第二開關SW2之控制端的電流。 Specifically, the second resistor R2 and the second diode D2 are connected in series between the output terminal 112 of the conversion circuit 110 and the second switch SW2, so as to reduce the current flowing through the second diode D2. The amplifier circuit 241 is electrically connected between the output terminal of the comparator 141 and the control terminal of the second switch SW2, so as to amplify the output voltage of the comparator 141. The third resistor R3 is electrically connected to the control circuit of the amplifier circuit 241 and the second switch SW2. Control terminals to reduce the current transmitted to the control terminal of the second switch SW2.
與圖1實施例相似地,當輸入電壓VI被供應,且第一開關SW1導通時,輸出電容C1可對負載101進行放電,且切換電路220與偵測電路240停止操作。當輸入電壓VI被供應,且第一開關SW1不導通時,輸出電容C1與儲能元件130可進行充電,且偵測電路240不導通切換電路220中的第二開關SW2。當輸入電壓VI不被供應時,比較器141可產生高準位電壓,且放大電路241可放大高準位電壓。此外,放大後的高準位電壓可透過第三電阻R3傳送至第二開關SW2的控制端,以藉此導通第二開關SW2。此外,隨著第二開關SW2的導通,儲能元件130所儲存的能量將可透過第二開關SW2、第二二極體D2與第二電阻R2傳送至負載101。藉此,在電源轉換裝置200被斷電後的維持時間內,輸出電容C1與儲能元件130將可持續地供應電源電壓VO至負載101。至於圖2實施例中各元件的細部配置與操作已包含在圖1實施例中,故在此不予贅述。 Similar to the embodiment of FIG. 1, when the input voltage VI is supplied and the first switch SW1 is turned on, the output capacitor C1 can discharge the load 101, and the switching circuit 220 and the detection circuit 240 stop operating. When the input voltage VI is supplied and the first switch SW1 is not turned on, the output capacitor C1 and the energy storage element 130 can be charged, and the detection circuit 240 does not turn on the second switch SW2 in the switching circuit 220. When the input voltage VI is not supplied, the comparator 141 can generate a high-level voltage, and the amplifier circuit 241 can amplify the high-level voltage. In addition, the amplified high-level voltage can be transmitted to the control terminal of the second switch SW2 through the third resistor R3 to thereby turn on the second switch SW2. In addition, as the second switch SW2 is turned on, the energy stored in the energy storage element 130 can be transmitted to the load 101 through the second switch SW2, the second diode D2, and the second resistor R2. Thereby, the output capacitor C1 and the energy storage element 130 will continuously supply the power supply voltage VO to the load 101 during the sustaining time after the power conversion device 200 is powered off. As for the detailed configuration and operation of each element in the embodiment of FIG. 2, it is included in the embodiment of FIG. 1, so it will not be repeated here.
綜上所述,本發明的電源轉換裝置可在輸入電壓被供應時對儲能元件進行充電,且電源轉換裝置可在輸入電壓不被供應時,透過輸出電容與儲能元件在維持時間內供應電源電壓。換言之,電源轉換裝置可將能量預先儲存在儲能元件中。藉此,當電源轉換裝置突然被斷電時,電源轉換裝置可利用預先儲存在儲能元件的能量來有效地延長維持時間,從而有助於提升設有電源轉換裝置之電子設備的穩定性。 In summary, the power conversion device of the present invention can charge the energy storage element when the input voltage is supplied, and the power conversion device can supply the output capacitor and the energy storage element during the maintenance time when the input voltage is not supplied. voltage. In other words, the power conversion device can store energy in the energy storage element in advance. Therefore, when the power conversion device is suddenly powered off, the power conversion device can use the energy stored in the energy storage element to extend the maintenance time effectively, thereby helping to improve the stability of the electronic equipment provided with the power conversion device.
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 as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.
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US20100182808A1 (en) * | 2007-06-15 | 2010-07-22 | Sanken Electric Co., Ltd. | Switching power source device |
TW201201493A (en) * | 2010-06-21 | 2012-01-01 | Niko Semiconductor Co Ltd | Flyback power converter with multi-output and a secondary side post regulator thereof |
US20140078789A1 (en) * | 2012-09-20 | 2014-03-20 | Iwatt Inc. | Switching power converter with secondary-side dynamic load detection and primary-side feedback and control |
CN104254970A (en) * | 2012-04-27 | 2014-12-31 | 三菱电机株式会社 | Dc/dc converter, on-board unit and charging device |
TW201517492A (en) * | 2013-10-30 | 2015-05-01 | Novatek Microelectronics Corp | AC-DC converting apparatus and operating method thereof |
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US20100182808A1 (en) * | 2007-06-15 | 2010-07-22 | Sanken Electric Co., Ltd. | Switching power source device |
TW201201493A (en) * | 2010-06-21 | 2012-01-01 | Niko Semiconductor Co Ltd | Flyback power converter with multi-output and a secondary side post regulator thereof |
CN104254970A (en) * | 2012-04-27 | 2014-12-31 | 三菱电机株式会社 | Dc/dc converter, on-board unit and charging device |
US20140078789A1 (en) * | 2012-09-20 | 2014-03-20 | Iwatt Inc. | Switching power converter with secondary-side dynamic load detection and primary-side feedback and control |
TW201517492A (en) * | 2013-10-30 | 2015-05-01 | Novatek Microelectronics Corp | AC-DC converting apparatus and operating method thereof |
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