200810329 九、發明說明： 【發明所屬之技術領域】 本發明相關於一種電源轉換器及相關輸出電壓方法，尤 指一種可提供多重輸出電壓之電源轉換器及相關輸出電壓 方法。 【先前技術】 電子裝置通常包含有不同的元件，每一元件所需的操作 電壓可能都不同。因此，在電子裝置中，常常需要透過電 源轉換器（power converter)來達到電壓準位的調節（升壓或 降壓）’並使之穩定在所設定的電壓數值。依不同的電源需 求’電源轉換器包含降壓式電源轉換器（buck/step d〇WJ1 converter)及幵經式電源轉換器（boost/step up converter)。 顧名思義’降壓式電源轉換器可將輸入端的直流電壓下降 至一預設電壓準位，而昇壓式電源轉換器則可提升輸入端 的直流電壓至一預設電壓準位。 【發明内容】 本發明提供一種可提供多重輸出電壓之電源轉換器，其 包含一輸入端，用來接收一輸入電壓；複數個輸出端，用 來提供複數個輸出電壓；一電感，·一第一開關裝置，耦接 於該電感之第一端和一低於該輸入電屬之預定電位之間； 200810329 :第=關裝置’轉接於該輸入端和該電感之第二端之 輸出接於該電感之第一端吻 間；該複數個輸出端中之一第二輸出端之 充電，電/:二置’用來開啟該第一和第二開關裝置以 電感’依據於該第-輸出端所得到之一第一輸出雷 塵及於第二輸出端 J弟輪出電 斷是否需要充電琴第山山弟一輸出電屢之值來分別判 據判斷結果來開啟該第二和第三 並依 第-端來放電該電感並充電該第一輸;端:感， :和第四開關裝置以透過該電感之第—端來放 透過該電感之第二端來放電該第二輸出端。感 發明另提供-種提供多重輸出轉方法，其包含 弟一電源和一低於該第一電源之第二 ’、 第—端和該第-電源之間提供—第—路徑二 —端和該第二電源之間提供一第二路 之弟 第-電源依序透過該第-路徑、該電残和2電流能從該 該第二電源以充電該電感；依據於一第路=流至 —第-輸出電壓來判斷是否需要充&端所件到之 要夯+兮穿认， ^ Μ弟—輸出端；當需 要充电该弟一輸出端時，在該電感之第 ^ 之間提供該第-路徑且在該電感之第〜、一電源 之間提供-_，使得電流能 200810329 二/亥弟一輸出端以充電該第-輸出端；依據於-第二 :而所得到之一第二輸出電塵來判斷是否需要放電該第 端；以及當需要放電該第二輸出端時，在該電感之 而和該第二輸出端之間提供—第四路#且在該電感之 該第二電源之間提供該第二路徑，使得電流能從 輪出端透過該第四路徑流至該電感以放電該第二輸 出端。 【實施方式】 請參考第1圖’第"為本發明第—實施例中一種可提 供多重輸出電壓之電源轉換器1〇之示意圖。電源轉換器 10包含-比較電路12、一邏輯電路14、一電感L、複數個 開關SWH。〜SWHm& SWU)〜SWLn ’以及複數個驅動單元 Dho〜DHm及DL〇〜DLn。電源轉換器1〇包含一輸入端、m個 輸出端〇出〜〇咖和n個輸出端〇Li〜〇Ln，輸入端之電位由 VIN來表示’而輸出端0H1〜0Hm和0l1〜0Ln之電位分別由 VGH丨〜vGHm和VGL1〜vGLn來表示。電感[之兩端透過開關 SWho和SWu^_接於接地電位和電源轉換器之輸入 端’開關swH1〜SWHm分_接於相對應之輸出端n 和電感L n n開關Sn則分職接於 相對應之輸出端〇L1〜〇Ln和電感L之第二端之間。比較電 路12耦接於電源轉換器10之輸出端，可將輸出電壓 vGH丨〜vGHm和VGU〜vGLn之值分別和相對應之預定電位作 8 200810329 比較，邏輯電路14再依據比較結果來控制驅動單元 DH0〜DHm及DL〇〜DLn。驅動单元DH〇〜DHm可分別提供開啟 (短路）或關閉（開路）開關SWH〇〜SWHm所需之控制訊號，而 驅動單元DL()〜DLn可分別提供開啟或關閉開關SWL()〜SWLn 所需之控制訊號。 在本發明第一實施例之電源轉換器10中，輸入電壓VIN 可被提昇至m組輸出電壓200810329 IX. INSTRUCTIONS: FIELD OF THE INVENTION The present invention relates to a power converter and associated output voltage method, and more particularly to a power converter and associated output voltage method that provides multiple output voltages. [Prior Art] Electronic devices usually contain different components, and the operating voltages required for each component may be different. Therefore, in an electronic device, it is often necessary to pass a power converter to achieve voltage level regulation (boost or step down) and stabilize it at a set voltage value. Depending on the power requirements, the power converter includes a buck/step d〇WJ1 converter and a boost/step up converter. As the name implies, the buck power converter can reduce the DC voltage at the input to a preset voltage level, while the boost converter can boost the DC voltage at the input to a preset voltage level. SUMMARY OF THE INVENTION The present invention provides a power converter capable of providing multiple output voltages, including an input terminal for receiving an input voltage, a plurality of output terminals for providing a plurality of output voltages, and an inductor. a switching device coupled between the first end of the inductor and a predetermined potential lower than the input current; 200810329: the first = off device is coupled to the output terminal and the output of the second end of the inductor Between the first end of the inductor; the second output of the plurality of outputs is charged, and the second / second is used to turn on the first and second switching devices to have an inductance based on the first At the output end, one of the first output lightning dust and the second output end of the J-wheel output is required to be recharged. Discharging the inductor according to the first end and charging the first output; the end: sense, and the fourth switching device transmits the second output through the second end of the inductor through the first end of the inductor end. Further, the invention provides a multiple output switching method, which includes a first power supply and a lower than the first power supply, a second end, a first end, and the first power supply. Providing a second path between the second power source, the first power source sequentially transmits the first path through the first path, the residual current, and the current can be charged from the second power source; according to a second path = flow to - The first-output voltage is used to determine whether it is necessary to charge & the end of the device is required to be 夯 兮 兮 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ — — — — — — — — — — — — — — — — The first path and the -_ are provided between the first and the first power sources of the inductor, so that the current can be 200810329 2/Haidi output to charge the first output; according to the second: Dielectric dust is output to determine whether the first end needs to be discharged; and when the second output end needs to be discharged, a fourth path # is provided between the inductance and the second output end, and the first portion of the inductance Providing the second path between the two power sources such that current can pass through the fourth path from the wheel end The inductor to discharge to the second output terminal. [Embodiment] Please refer to Fig. 1 'the' is a schematic diagram of a power converter 1 可 which can provide multiple output voltages in the first embodiment of the present invention. The power converter 10 includes a comparison circuit 12, a logic circuit 14, an inductor L, and a plurality of switches SWH. ~SWHm&SWU)~SWLn' and a plurality of drive units Dho~DHm and DL〇~DLn. The power converter 1 〇 includes an input terminal, m output terminals 〇 〇 〇 和 and n output terminals 〇 Li 〇 〇 Ln, the potential of the input terminal is represented by VIN ' and the output terminals 0H1 ～ 0Hm and 0l1 〜 0Ln The potentials are represented by VGH丨~vGHm and VGL1~vGLn, respectively. Inductance [the two ends of the switch SWho and SWu^_ are connected to the ground potential and the input end of the power converter' switch swH1~SWHm are connected to the corresponding output terminal n and the inductor L nn switch Sn is connected to the phase Corresponding output terminals 〇L1~〇Ln and the second end of the inductor L. The comparison circuit 12 is coupled to the output end of the power converter 10, and compares the values of the output voltages vGH丨~vGHm and VGU~vGLn with the corresponding predetermined potentials as 8200810329, and the logic circuit 14 controls the driving according to the comparison result. Units DH0 to DHm and DL〇~DLn. The driving units DH〇~DHm can respectively provide control signals required to turn on (short-circuit) or turn off (open-circuit) switches SWH〇~SWHm, and the driving units DL()~DLn can respectively provide on/off switches SWL()~SWLn The control signal is required. In the power converter 10 of the first embodiment of the present invention, the input voltage VIN can be boosted to m sets of output voltages.
VghI〜V〇Hm 5 或降低至η組輸出 電壓Vgl 1〜VGLn。亦即’依不同的電源需求’電源轉換器 10可將輸入電壓VIN轉換為（m+n)組不同電壓準位之輸出 電壓。舉例來說，假設此時需要提供兩組輸出電壓VGL1和 VGH1，電源轉換器10之運作由第2圖之流程圖來做說明， 第2圖之流程圖包含下列步驟： 步驟100 : 開始。 步驟110 : 開啟開關SWH〇和SWL〇，關閉開關 SWH广SWHm& SWL1 〜SWLn。 步驟120 : 判斷輸出端0H1之電位是否已經達到 V〇hi ;若輸出端〇Η1電位已經達到 Vghi，執 行步驟140 ;若輸出端0H1電位尚未達到 Vghi ’執行步驟130。 步驟130 : 開啟開關SWL〇和SWH1，關閉開關 swHG、SWH2〜SWHm 及 SWL1〜SWLn，執行步 200810329 驟】】〇 〇 步驟〗40 : . ―輸㈣〇u之電位是否已經達到 I:驟讀出仏1電位已經達到執 步騍150 60 ’右輸出端〇u電位尚未達到 GL1 ’執行步驟15〇。 開啟開關sWh〇和sWli，關閉開關 H-swHm，swL0^swL2.swLn，^t# 鄉 110 〇 步驟160 關閉開關swH0〜swHm及SWu)〜SWi^。 和stIZ，中’當於步驟110中開啟開關swH0 气L。：牛驟:二開關時，此時電源轉換器10會充電電 =田步驟110中判斷輸出端〇Hi之電位尚未達 之輸出電麼VGH1時，此時會執 和SWH1並關閉其它 汗_SWL〇 如此尾/原轉換态Η)可放電電咸 出=輸出：0Η1’直到輸出端0H1之電位達到所需之輸 GH1為止。问理，當步驟14〇中判斷輸出端Ου之 電位尚未達到所需之輸出電壓W寺，此時會執行步驟 B0以開啟開關〜和SWli並關閉其它開關，如此電源 轉換器10可放電電感L並充電輸出端〇Li，直到輸出端'、 0=之電位達到所需之輸出電壓V⑷為止。請參考第3圖 至第5圖’第3圖為執行步，驟110後電源轉換器10之等效 電路圖，第4圖為執行步驟13〇後電源轉換器1〇之等效電 200810329 路圖’第5圖為執行步驟150後電源轉換器i〇之等致電 圖。在第3圖至第5圖中，電流流向由箭頭來表示。 請參考第6圖，第6圖為本發明第二實施例中—種可提 供多重輸出電壓之電源轉換器20之示意圖。電源轉換器 20包含一比較電路22、一邏輯電路24、一電流限制單^ 26、一電感L、複數個開關SWH0〜SWHm及SWu)〜sw[， 以及複數個驅動單元DH〇〜DHm及DL〇〜DLn。電源轉換芎 包含一輸入端、m個輸出端〇Η1〜〇Ηιτ^α n個輸出端 〇Ll〜〇Ln，輸入端之電位由VIN來表示，而輸出端〇Ηι〜〇 和〇Li〜〇Ln之電位分別由vGH1〜VGHm和vGL1〜vGLn來表示。 電感L之第一端透過開關SWh〇耦接於接地電位，而電 之第二端透過開關swL。和電流限制單元26搞接於電源轉 換器20之輸入端。開_ SWhi〜Su別輕接於相對應之 輸出端〇m〜〇Hm和電感L之第—端之間，而開關 ::swLn則分別耦接於相對應之輪出端和電感 之：：端之間。在本發明第二實施例之電源轉換器2〇 中’電竭，】單元26可包含-電阻R，電阻R上之跨壓由 VSENSE來表示。比較雷故99知k ^ 罕乂4珞22耦接於電源轉換器20之輸出 :廡可將輪出電壓…一 n之值分別和相 =之預定電位作比較，邏輯電路24再依據比較結果和跨 ^S:E來控制驅動單元D-〜I及D『DLn。驅動單元 H°如可分別提供開啟開關或關閉SWH0〜SWHin所需之 200810329 控制訊號，而驅動單元DH〇〜DHn可分別提供開啟關閉開關 SWLG〜SWLn所需之控制訊號。 相較於本發明第一實施例之電源轉換器10，本發明第 二實施例之電源轉換器20同樣可將輸入電壓VIN轉換為 (m+n)組不同電壓準位之輸出電壓，不同之處在於電源轉換 器20另包含電流限制單元26。電源轉換器20可依據電流 限制單元26之跨壓VSENSE來控制流經電感L之電流大小。 舉例來說，假設此時需要提供兩組輸出電壓VGU和VGH1， 電源轉換器20之運作由第7圖之流程圖來做說明，第7圖 之流程圖包含下列步驟： 步驟200 : 開始。 步驟205 : 判斷跨壓VSENSE是否超過一預定值；若 跨壓Vsense超過預定值’執行步驟220 ;若 跨壓V SENSE 未超過預定值，執行步驟210。 步驟210 : 開啟開關SWH〇和SWL〇，關閉開關 SWH广SWHm& SWL1〜SWLn，執行步驟 205 〇 步驟220 : 判斷輸出端0H1之電位是否已經達到 V〇hi ;若輸出端〇Η1電位已經達到 Vghi ’ 執 行步驟240 ;若輸出端Oh1電位尚未達到 VGH丨，執行步驟230。 步驟230 : 開啟開關SWL〇和SWH1，關閉開關 12 200810329 swH〇、SWH2〜SWHm& SWL1〜SWLn，執行步 驟 205。 步驟240 : 判斷輸出端0L1之電位是否已經達到VghI~V〇Hm 5 is reduced to the n-group output voltages Vgl 1 to VGLn. That is, the power converter 10 can convert the input voltage VIN into (m+n) sets of output voltages of different voltage levels. For example, assuming that two sets of output voltages VGL1 and VGH1 need to be provided at this time, the operation of the power converter 10 is illustrated by the flowchart of FIG. 2, and the flowchart of FIG. 2 includes the following steps: Step 100: Start. Step 110: Turn on the switches SWH〇 and SWL〇, and turn off the switches SWH wide SWHm& SWL1 to SWLn. Step 120: It is judged whether the potential of the output terminal 0H1 has reached V〇hi; if the output terminal 〇Η1 potential has reached Vghi, step 140 is performed; if the output terminal 0H1 potential has not reached Vghi, step 130 is performed. Step 130: Turn on the switches SWL〇 and SWH1, turn off the switches swHG, SWH2~SWHm, and SWL1~SWLn, and execute step 200810329.] Step 〗40: . ―Whether the potential of the input (four)〇u has reached I: The 仏1 potential has reached the step 骒150 60' right output 〇u potential has not yet reached GL1 'Execute step 15〇. Turn on the switches sWh〇 and sWli, turn off the switch H-swHm, swL0^swL2.swLn,^t# Township 110 〇 Step 160 Turn off the switches swH0~swHm and SWu)~SWi^. And stIZ, 'in the step 110, the switch swH0 gas L is turned on. : Cattle: When the switch is turned on, the power converter 10 will charge at this time. In step 110, it is judged that the output of the output terminal 〇Hi has not yet reached the output power of VGH1. At this time, SWH1 will be executed and other sweats will be turned off. 〇 So tail / original conversion state Η) Dischargeable electric salt out = Output: 0Η1' until the potential of the output terminal 0H1 reaches the desired input GH1. Asked, when it is judged in step 14 that the potential of the output terminal has not reached the required output voltage W, then step B0 is executed to turn on the switches ~ and SWli and turn off the other switches, so that the power converter 10 can discharge the inductor L. And charge the output terminal 〇Li until the output terminal ', 0 = potential reaches the required output voltage V (4). Please refer to Fig. 3 to Fig. 5'. Fig. 3 is the execution circuit, the equivalent circuit diagram of the power converter 10 after step 110, and Fig. 4 is the equivalent circuit of the power converter 1〇 after performing step 13〇. 'Fig. 5 is a call diagram of the power converter i after performing step 150. In Figs. 3 to 5, the current flow direction is indicated by an arrow. Please refer to FIG. 6. FIG. 6 is a schematic diagram of a power converter 20 capable of providing multiple output voltages according to a second embodiment of the present invention. The power converter 20 includes a comparison circuit 22, a logic circuit 24, a current limit unit 26, an inductor L, a plurality of switches SWH0~SWHm and SWu)~sw[, and a plurality of drive units DH〇~DHm and DL. 〇 ~ DLn. The power conversion 芎 includes an input terminal, m output terminals 〇Η1~〇Ηιτ^α n output terminals 〇L1~〇Ln, the potential of the input terminal is represented by VIN, and the output terminals 〇Ηι~〇 and 〇Li~〇 The potential of Ln is represented by vGH1 to VGHm and vGL1 to vGLn, respectively. The first end of the inductor L is coupled to the ground potential through the switch SWh, and the second end of the power is transmitted through the switch swL. The current limiting unit 26 is coupled to the input of the power converter 20. _ SWhi~Su is not connected between the corresponding output terminal 〇m~〇Hm and the first end of the inductor L, and the switch::swLn is respectively coupled to the corresponding wheel terminal and the inductor:: Between the ends. In the power converter 2A of the second embodiment of the present invention, the unit 26 may include a resistor R, and the voltage across the resistor R is represented by VSENSE. The comparison circuit 99 knows that k ^ 乂 4珞22 is coupled to the output of the power converter 20: 庑 can compare the value of the wheel-out voltage...-n with the predetermined potential of the phase=, and the logic circuit 24 according to the comparison result And across the ^S:E to control the drive units D-~I and D『DLn. The drive unit H° can provide the 200810329 control signals required to turn on the switches or turn off the SWH0~SWHin respectively, and the drive units DH〇~DHn can respectively provide the control signals required to turn on the off switches SWLG~SWLn. Compared with the power converter 10 of the first embodiment of the present invention, the power converter 20 of the second embodiment of the present invention can also convert the input voltage VIN into (m+n) sets of output voltages of different voltage levels, which are different. The power converter 20 further includes a current limiting unit 26. The power converter 20 can control the magnitude of the current flowing through the inductor L according to the voltage across the voltage limiting unit VSENSE. For example, assuming that two sets of output voltages VGU and VGH1 need to be provided at this time, the operation of the power converter 20 is illustrated by the flowchart of FIG. 7. The flowchart of FIG. 7 includes the following steps: Step 200: Start. Step 205: Determine whether the voltage across the voltage VSENSE exceeds a predetermined value; if the voltage across the voltage Vsense exceeds the predetermined value, perform step 220; if the voltage across the voltage V SENSE does not exceed the predetermined value, perform step 210. Step 210: Turn on the switches SWH〇 and SWL〇, turn off the switch SWH wide SWHm& SWL1~SWLn, and perform step 205 〇 Step 220: Determine whether the potential of the output terminal 0H1 has reached V〇hi; if the output terminal 〇Η1 potential has reached Vghi 'Execution step 240; If the output Oh1 potential has not reached VGH丨, step 230 is performed. Step 230: Turn on the switches SWL〇 and SWH1, turn off the switches 12 200810329, swH〇, SWH2 to SWHm& SWL1 to SWLn, and execute step 205. Step 240: Determine whether the potential of the output terminal 0L1 has been reached.
Vgli ; 若輸出端〇Ll電位已經達到 Vgli ’ 執 行步驟260 ;若輸出端0L1電位尚未達到 V〇li 5 執行步驟250。 步驟250 : 開啟開關SWH〇和SWL1，關閉開關 SWH1〜SWHm、SWL〇 及 SWL2〜SWLn，執行步 驟 205。 步驟260 : 關閉開關SWH〇〜SWHm及SWL〇〜SWLn 〇 在第7圖之流程圖中，首先於步驟205中判斷電流限制 單元26之跨壓 VsENSE是否超過預定值。若跨壓VsENSE未 超過預定值，此時會執行步驟210以開啟開關SWH〇和SWL0 並關閉其它開關，因此電源轉換器20會充電電感L。若跨 壓 VsENSE 已超過預定值，接著會執行步驟220以判斷輸出 端〇hi之電位是否已經達到所需之輸出電壓VGH1，以及執 行步驟240以判斷判斷輸出端0L1之電位是否已經達到所 需之VGL1。當步驟220中判斷輸出端0H1電位尚未達到所 需之輸出電壓VGH1，此時會執行步驟230以開啟開關SWL0 和SWH1並關閉其它開關，如此電源轉換器20可放電電感 L並充電輸出端0H1，直到輸出端0H1之電位達到所需之輸 出電壓VGH1為止。同理，當步驟240中判斷輸出端0L1之 13 200810329 電位尚未達到所需之輸出電壓Vgli時，此時會執行步驟 250以開啟開關sw則和SWli並關閉其它開關，如此電源 轉換器20可放電電感L並充電輸出端〇L1，直到輸出端 電位達到所需之輸出電壓vGL1為止。請再次參考第 囷至第5圖，第3圖同樣為執行步驟21 〇後電源轉換器 7之等效電路圖’第4圖同樣為執行步驟230後電源轉換 器之等效電路圖’第5圖同樣為執行步驟25〇後電源轉 換态20之等效電路圖。 ，依不同的電源需求’本發明之電源轉換器可將一輸入電 【轉換為减組不同電壓準位之輸出電壓，並依據輸出端 之電位來控制充電及放電’因此能有效地達到降壓或昇壓 的效杲。 直上所述僅為本發明之較佳實施例，凡依本發明申請 ’乾II所做之均等⑽化與修飾，皆應屬本發明之涵蓋範 【圖式簡單說明】 弟1圖為本發明第一實施例φ — Ψ^j中一種可提供多重輸出電壓之 包源轉換器之示意圖。 第2圖為第1圖之電源轉換 ^θ ^ 付俠态運作時之流程圖。 弟圖為電源轉換器之等效電路圖。 200810329 第4圖為電源轉換器之等效電路圖。 第5圖為電源轉換器之等效電路圖。 第6圖為本發明第二實施例中一種可提供多重輸出電壓之 電源轉換器之示意圖。 第7圖為第6圖之電源轉換器運作時之流程圖。 【主要元件符號說明】 10 Λ 20 電源轉換器 12、22 比較電路 14、24 邏輯電路 26 電流限制單元 L 電感 R 電阻 SWh〇〜SWhiti、SWlo〜SWLn 開關 Dho〜DHm、Dlo〜DLn 驅動單元 〇Hl〜〇Hm、〇Ll〜〇Ln 輪出端 100〜160 、 200〜260 步驟 15Vgli ; If the output terminal 〇Ll potential has reached Vgli ’ step 260; if the output terminal 0L1 has not reached V〇li 5, go to step 250. Step 250: Turn on the switches SWH〇 and SWL1, turn off the switches SWH1 to SWHm, SWL〇 and SWL2 to SWLn, and execute step 205. Step 260: Turn off the switches SWH〇~SWHm and SWL〇~SWLn. In the flowchart of Fig. 7, first, in step 205, it is judged whether or not the voltage across the voltage limit unit VsENSE exceeds a predetermined value. If the voltage across the voltage VsENSE does not exceed the predetermined value, step 210 is executed to turn on the switches SWH and SWL0 and turn off the other switches, so the power converter 20 charges the inductor L. If the voltage across the voltage VsENSE has exceeded the predetermined value, step 220 is performed to determine whether the potential of the output terminal 〇hi has reached the required output voltage VGH1, and step 240 is performed to determine whether the potential of the output terminal 0L1 has reached the desired value. VGL1. When it is determined in step 220 that the potential of the output terminal 0H1 has not reached the required output voltage VGH1, step 230 is performed to turn on the switches SWL0 and SWH1 and turn off other switches, so that the power converter 20 can discharge the inductor L and charge the output terminal 0H1. Until the potential of the output terminal 0H1 reaches the desired output voltage VGH1. Similarly, when it is judged in step 240 that the potential of the 2008 200810329 of the output terminal 0L1 has not reached the required output voltage Vgli, step 250 is performed to turn on the switch sw and SWli and turn off the other switches, so that the power converter 20 can discharge. The inductor L charges the output terminal 〇L1 until the output terminal potential reaches the desired output voltage vGL1. Please refer to the second to fifth figures again. The third figure is also the equivalent circuit diagram of the power converter 7 after performing step 21. The fourth figure is also the equivalent circuit diagram of the power converter after performing step 230. In order to perform the equivalent circuit diagram of the power conversion state 20 after step 25. According to different power supply requirements, the power converter of the present invention can convert an input power into an output voltage of different voltage levels and control charging and discharging according to the potential of the output end, so that the voltage can be effectively reduced. Or the effect of boosting. The above description is only a preferred embodiment of the present invention, and the equalization (10) and modification of the application of the invention according to the present invention should belong to the scope of the present invention. A schematic diagram of a packet-source converter that provides multiple output voltages in the first embodiment φ - Ψ^j. Figure 2 is a flow chart of the power conversion of Fig. 1 when the power supply is operated. The figure is the equivalent circuit diagram of the power converter. 200810329 Figure 4 shows the equivalent circuit diagram of the power converter. Figure 5 is an equivalent circuit diagram of the power converter. Figure 6 is a schematic diagram of a power converter capable of providing multiple output voltages in a second embodiment of the present invention. Figure 7 is a flow chart of the operation of the power converter of Figure 6. [Main component symbol description] 10 Λ 20 Power converter 12, 22 Comparison circuit 14, 24 Logic circuit 26 Current limiting unit L Inductance R Resistor SWh〇~SWhiti, SWlo~SWLn Switch Dho~DHm, Dlo~DLn Drive unit 〇Hl ~〇Hm,〇Ll~〇Ln Round out 100~160, 200~260 Step 15