TWI469476B - Multi-output switching regulator and multi-output power supply method - Google Patents
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本發明係有關一種多輸出切換式電源供應器及多輸出電源供應方法,特別是指一種可供應多個輸出電流的多輸出切換式電源供應器及多輸出電源供應方法。The invention relates to a multi-output switching power supply and a multi-output power supply method, in particular to a multi-output switching power supply and a multi-output power supply method capable of supplying a plurality of output currents.
第1圖顯示習知多輸出切換式電源供應電路1的示意圖。如第1圖所示,多輸出切換式電源供應電路1中,脈寬調變(pulse width modulation,PWM)訊號產生電路11根據電壓感測電路12與13,感測輸出端點Vout1與Vout2的電壓所產生的反饋訊號FB1與FB2,產生PWM訊號PWM1與PWM2,以操作兩組非同步升壓切換式功率級電路14與15,用以將輸入電壓Vin轉換為輸出端點Vout1與Vout2的電壓。習知的多輸出切換式電源供應電路1需要複數的功率級電路14與15,以將輸入電壓Vin轉換為複數輸出端點Vout1與Vout2的電壓。其中,功率級電路14與15可為同步或非同步之降壓型、升壓型、反壓型、或升降壓型功率級電路,如第2A-2J圖所示。FIG. 1 shows a schematic diagram of a conventional multi-output switching power supply circuit 1. As shown in FIG. 1, in the multi-output switching power supply circuit 1, a pulse width modulation (PWM) signal generating circuit 11 senses the output terminals Vout1 and Vout2 according to the voltage sensing circuits 12 and 13. The feedback signals FB1 and FB2 generated by the voltage generate PWM signals PWM1 and PWM2 to operate two sets of asynchronous boost switching power stage circuits 14 and 15 for converting the input voltage Vin into voltages of the output terminals Vout1 and Vout2. . The conventional multi-output switching power supply circuit 1 requires a plurality of power stage circuits 14 and 15 to convert the input voltage Vin into voltages of the complex output terminals Vout1 and Vout2. The power stage circuits 14 and 15 can be synchronous or asynchronous step-down, step-up, back-pressure, or buck-boost power stage circuits, as shown in FIG. 2A-2J.
上述先前技術需要兩組以上的功率級電路,以提供複數的輸出電流Io1與Io2,在應用上相當不便,製造成本也高。The above prior art requires more than two sets of power stage circuits to provide a plurality of output currents Io1 and Io2, which is quite inconvenient in application and high in manufacturing cost.
有鑑於此,本發明即針對上述先前技術之不足,提出一種多輸出切換式電源供應器及多輸出電源供應方法,可共用一個功率級,即共用同一電感,即可產生複數輸出,且可動態調整電流分配。In view of the above, the present invention is directed to the above-mentioned deficiencies of the prior art, and provides a multi-output switching power supply and a multi-output power supply method, which can share one power level, that is, share the same inductance, and can generate a complex output, and can be dynamic Adjust the current distribution.
本發明目的之一在提供一種多輸出切換式電源供應器。One of the objects of the present invention is to provide a multi-output switching power supply.
本發明另一目的在提供一種多輸出電源供應方法。Another object of the present invention is to provide a multi-output power supply method.
為達上述之目的,就其中一觀點言,本發明提供了一種多輸出切換式電源供應器,包含:一功率級電路,用以根據一脈寬調變(pulse width modulation,PWM)訊號,操作其中至少一功率開關與單一電感,而將一輸入電壓轉換為一轉換電壓;一多輸出電路,接收該轉換電壓,以產生複數輸出電流,供應給複數輸出端點;一電壓感測電路,根據該轉換電壓之電壓,以產生一反饋訊號;以及一PWM訊號產生電路,根據該反饋訊號,以產生該PWM訊號。In order to achieve the above object, in one aspect, the present invention provides a multi-output switching power supply comprising: a power stage circuit for operating according to a pulse width modulation (PWM) signal At least one power switch and a single inductor convert an input voltage into a conversion voltage; a multi-output circuit receives the conversion voltage to generate a complex output current, which is supplied to the complex output terminal; a voltage sensing circuit, according to The voltage of the voltage is converted to generate a feedback signal; and a PWM signal generating circuit is configured to generate the PWM signal according to the feedback signal.
在其中一種實施型態中,該多輸出切換式電源供應器中,當該轉換電壓低於一預設位準時,減少至少一輸出電流。In one embodiment, the multi-output switching power supply reduces at least one output current when the converted voltage is lower than a predetermined level.
在其中一種實施型態中,該多輸出切換式電源供應器可更包含:一電流控制電路,用以分別感測各輸出電流,以產生對應的電流控制訊號,其中,該多輸出電路根據該電流控制訊號,而產生該複數輸出電流。In one embodiment, the multi-output switching power supply may further include: a current control circuit for respectively sensing each output current to generate a corresponding current control signal, wherein the multiple output circuit is configured according to the current output control signal The current control signal generates the complex output current.
在上述實施型態中,該複數輸出電流可設有一總量上限,且該電流控制電路動態分配各輸出電流的上限。In the above embodiment, the complex output current may be provided with a total upper limit, and the current control circuit dynamically allocates an upper limit of each output current.
上述實施型態中,該多輸出電路可包括複數負載開關,分別位於該複數輸出電流的路徑上,且該複數負載開關根據該電流控制訊號而操作,以分別調整該複數輸出電流。In the above implementation manner, the multi-output circuit may include a plurality of load switches respectively located on the path of the complex output current, and the plurality of load switches operate according to the current control signal to respectively adjust the complex output current.
在一種實施型態中,至少一輸出電流設有上限,且該電流控制電路調整該電流控制訊號,當該設有上限之輸出電流不超過該上限時,使對應的負載開關完全導通,但當該對應的負載開關完全導通會使該設有上限之輸出電流超過該上限時,則使該該對應的負載開關部份導通,以使該設有上限之 輸出電流不超過該上限。In an implementation manner, at least one output current is provided with an upper limit, and the current control circuit adjusts the current control signal, and when the output current with the upper limit does not exceed the upper limit, the corresponding load switch is completely turned on, but when When the corresponding load switch is fully turned on, if the output current with the upper limit exceeds the upper limit, the corresponding load switch portion is turned on, so that the upper limit is provided. The output current does not exceed this upper limit.
在一種實施型態中,該複數輸出電流包括一主要輸出電流,對應於一主要負載開關,以及至少一從屬輸出電流,對應於一從屬負載開關,且該電流控制電路調整該電流控制訊號,以優先維持該主要輸出電流於一需求值。In one embodiment, the complex output current includes a primary output current corresponding to a primary load switch, and at least one slave output current corresponding to a slave load switch, and the current control circuit adjusts the current control signal to The primary output current is preferentially maintained at a demand value.
上述實施型態中,該複數輸出電流可設有一總量上限,且當該主要輸出電流維持於一需求值時,該電流控制電路調整該電流控制訊號,以將該總量上限減去該需求值所剩餘的電流量分配給各從屬輸出電流。In the above implementation manner, the complex output current may be provided with a total upper limit, and when the main output current is maintained at a required value, the current control circuit adjusts the current control signal to subtract the total upper limit from the demand. The amount of current remaining in the value is assigned to each slave output current.
在一種實施型態中,該多輸出切換式電源供應器較佳地係一電力銀行(power bank)。In one embodiment, the multi-output switched power supply is preferably a power bank.
就另一觀點言,本發明也提供了一種多輸出電源供應方法,包含:根據一脈寬調變(pulse width modulation,PWM)訊號,操作一功率級電路,而將一輸入電壓轉換為一轉換電壓,並根據該轉換電壓,產生複數輸出電流;以及分別控制該複數輸出電流,以維持該複數輸出電流之電流總量不超過一總量上限。In another aspect, the present invention also provides a multi-output power supply method, comprising: operating a power stage circuit according to a pulse width modulation (PWM) signal, and converting an input voltage into a conversion And generating a plurality of output currents according to the converted voltage; and separately controlling the complex output current to maintain the total current of the complex output current not exceeding a total upper limit.
在一種實施型態中,該方法可更包含:當該轉換電壓低於一預設位準時,減少至少一輸出電流。In an implementation manner, the method may further include: reducing at least one output current when the conversion voltage is lower than a predetermined level.
在一種實施型態中,該複數輸出電流包括一主要輸出電流,以及至少一從屬輸出電流,且該方法更包含:優先維持該主要輸出電流於一需求值。In one embodiment, the complex output current includes a primary output current and at least one slave output current, and the method further includes: preferentially maintaining the primary output current at a demand value.
上述實施型態中,該方法可更包含:當該主要輸出電流維持於一需求值時,將該總量上限減去該需求值所剩餘的電流量分配給各從屬輸出電流。In the above implementation manner, the method may further include: when the main output current is maintained at a demand value, the current amount remaining by subtracting the total value from the upper limit of the total amount is allocated to each of the slave output currents.
在一種實施型態中,該方法可更包含:動態分配各輸出 電流的上限。In an implementation manner, the method may further include: dynamically allocating each output The upper limit of the current.
上述實施型態中,動態分配各輸出電流的上限的步驟可包括:當其中一輸出電流未達其上限時,提高另一輸出電流的上限。In the above embodiment, the step of dynamically allocating the upper limit of each output current may include: increasing an upper limit of the other output current when one of the output currents does not reach the upper limit thereof.
底下藉由具體實施例詳加說明,當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。The purpose, technical content, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments.
請參閱第3圖,顯示本發明第一個實施例。如第3圖所示,多輸出切換式電源供應電路2包含功率級電路21、多輸出電路22、PWM訊號產生電路23、以及電壓感測電路24。在本實施例中,功率級21可以如第2A-2J圖所示,為各種型式的同步或非同步之降壓型、升壓型、反壓型、或升降壓型功率轉換電路。功率級21根據脈寬調變(pulse width modulation,PWM)訊號PWM3,操作其中之功率開關,並共用一電感(未示出,示於後續實施例中),以將輸入電壓Vin轉換為轉換電壓。電壓感測電路24感測轉換電壓,進而產生反饋訊號以輸入PWM訊號產生電路23。PWM訊號產生電路23根據反饋訊號,以產生PWM訊號PWM3。多輸出電路22接收轉換電壓,以產生複數輸出電流,例如但不限於如圖所示之兩輸出電流Io3、Io4,供應給兩輸出端點Vout3、Vout4。複數輸出電流和對應輸出端點的數目不限於為二,而可為更多。Referring to Figure 3, there is shown a first embodiment of the present invention. As shown in FIG. 3, the multi-output switching power supply circuit 2 includes a power stage circuit 21, a multi-output circuit 22, a PWM signal generating circuit 23, and a voltage sensing circuit 24. In the present embodiment, the power stage 21 can be various types of synchronous or non-synchronous step-down, step-up, back-pressure, or buck-boost power conversion circuits as shown in FIGS. 2A-2J. The power stage 21 operates a power switch according to a pulse width modulation (PWM) signal PWM3, and shares an inductance (not shown, shown in subsequent embodiments) to convert the input voltage Vin into a conversion voltage. . The voltage sensing circuit 24 senses the converted voltage, thereby generating a feedback signal for input to the PWM signal generating circuit 23. The PWM signal generating circuit 23 generates a PWM signal PWM3 based on the feedback signal. The multi-output circuit 22 receives the converted voltage to generate a complex output current, such as, but not limited to, two output currents Io3, Io4 as shown, supplied to the two output terminals Vout3, Vout4. The number of complex output currents and corresponding output terminals is not limited to two, but may be more.
上述第一個實施例中,如果兩輸出端點Vout3、Vout4都需要大量的電流,以致兩輸出電流Io3、Io4的總量過大時,將使得轉換電壓的電位下降,有可能超過功率級21的負荷能力。此情況時,根據本發明,可偵測該轉換電壓是否低於一 預設位準,而當轉換電壓低於該預設位準時,可調降兩輸出電流Io3、Io4至少其中之一。偵測的方式例如但不限於可將電壓感測電路24的輸出,前饋至多輸出電路22,與該預設位準比較,以控制兩輸出電流Io3、Io4其中之一或兩者。當然,偵測轉換電壓是否低於預設位準的方式,並不限於經由電壓感測電路24產生前饋訊號,圖示僅是其中一種實施方式。因多輸出電路22本就接收轉換電壓,因此也可在多輸出電路22內部直接將該轉換電壓(或其分壓)與該預設位準(或其分壓)比較,此情況下就可不需要自電壓感測電路24取得前饋訊號。而調降兩輸出電流Io3、Io4,也可以有各種的安排方式,例如兩者同時調降、或是以其中之一為主要的供應電流而優先維持於需求值,並調降另一非主要的輸出電流(以下將非主要的輸出電流稱為「從屬輸出電流」)。以後者為例,假設輸出端點Vout4為優先需要供電的輸出端,則輸出電流Io4為主要的輸出電流,此時若兩輸出電流Io3、Io4的總量過大,不論原因是因為兩輸出電流Io3、Io4何者的需求過高時,都可以優先調降輸出電流Io3但保持輸出電流Io4,以優先保持其中主要的輸出電流(在本例中為輸出電流Io4)。須說明的是,以上所述當轉換電壓的電位下降過低時,調降兩輸出電流至少其中之一的功能,僅是較佳實施方式而並非絕對必要。例如,如果可確定兩輸出端點所需要的電流總量,不會超過功率級21的負荷能力時,當然就可以不需要此功能。In the above first embodiment, if both output terminals Vout3 and Vout4 require a large amount of current, so that the total amount of the two output currents Io3, Io4 is too large, the potential of the conversion voltage is lowered, possibly exceeding the power level 21. Load capacity. In this case, according to the present invention, it can be detected whether the conversion voltage is lower than one The preset level is adjusted, and when the conversion voltage is lower than the preset level, at least one of the two output currents Io3 and Io4 is adjustable. The manner of detection, for example but not limited to, the output of the voltage sensing circuit 24 can be fed forward to the multi-output circuit 22 for comparison with the preset level to control one or both of the two output currents Io3, Io4. Of course, the manner of detecting whether the converted voltage is lower than a preset level is not limited to generating a feedforward signal via the voltage sensing circuit 24, and the illustration is only one of the embodiments. Since the multi-output circuit 22 receives the converted voltage, the converted voltage (or its partial voltage) can also be directly compared with the preset level (or its partial voltage) within the multi-output circuit 22, in which case it is not necessary. The feed forward signal needs to be obtained from the voltage sensing circuit 24. The two output currents Io3 and Io4 can be adjusted, and various arrangements can be made, for example, the two are simultaneously down-regulated, or one of the main supply currents is preferentially maintained at the demand value, and the other non-main The output current (hereinafter, the non-primary output current is referred to as "slave output current"). Taking the latter as an example, if the output terminal Vout4 is the output that needs to be powered first, the output current Io4 is the main output current. If the total output current Io3, Io4 is too large, the reason is because the two output currents Io3 When the demand of Io4 is too high, the output current Io3 can be preferentially adjusted but the output current Io4 is maintained to preferentially maintain the main output current (in this example, the output current Io4). It should be noted that when the potential of the conversion voltage drops too low, the function of reducing at least one of the two output currents is only a preferred embodiment and is not absolutely necessary. For example, if the total amount of current required by the two output terminals can be determined and does not exceed the load capacity of the power stage 21, this function may of course not be required.
第4圖顯示本發明的第二個實施例。如第4圖所示,多輸出切換式電源供應電路3包含功率級電路31、多輸出電路32、PWM訊號產生電路33、電壓感測電路34、與電流控制電路36。與第一個實施例不同的是,本實施例顯示多輸出切 換式電源供應電路3更包含電流控制電路36。電流控制電路36分別感測輸出電流Io5與Io6,以產生對應的電流控制訊號,而多輸出電路32接收轉換電壓,並根據電流控制訊號,而產生複數輸出電流。與前一實施例相似地,可以(但非必須)偵測該轉換電壓是否低於一預設位準,而當轉換電壓低於該預設位準時,可調降兩輸出電流Io5與Io6至少其中之一。偵測的方式例如但不限於由電壓感測電路34將其偵測結果前饋至電流控制電路36,以判斷是否要調降電流。當然,如前所述,亦可由多輸出電路32根據轉換電壓來直接進行判斷與電流調整。Figure 4 shows a second embodiment of the invention. As shown in FIG. 4, the multi-output switching power supply circuit 3 includes a power stage circuit 31, a multi-output circuit 32, a PWM signal generating circuit 33, a voltage sensing circuit 34, and a current control circuit 36. Different from the first embodiment, this embodiment shows multiple output cuts. The switched power supply circuit 3 further includes a current control circuit 36. The current control circuit 36 senses the output currents Io5 and Io6, respectively, to generate corresponding current control signals, and the multi-output circuit 32 receives the converted voltages and generates a plurality of output currents according to the current control signals. Similar to the previous embodiment, it may be (but not necessarily) to detect whether the conversion voltage is lower than a preset level, and when the conversion voltage is lower than the preset level, the two output currents Io5 and Io6 are adjustable at least one of them. The detection method is forward-fed to the current control circuit 36 by, for example, but not limited to, the voltage sensing circuit 34 to determine whether the current is to be adjusted. Of course, as described above, the multi-output circuit 32 can also directly perform the determination and current adjustment based on the converted voltage.
在較佳實施方式中,該複數輸出電流至少其中之一設有電流上限,且電流控制電路36例如但不必須可動態分配或調整該電流上限。電流控制電路36根據電流感測訊號與前述電流上限,調整電流控制訊號,使得複數輸出電流達到最佳化的安排。舉例而言,可根據使用者的需求,設置如以下方式的複數輸出電流控制:In a preferred embodiment, at least one of the plurality of output currents is provided with an upper current limit, and the current control circuit 36, for example but not necessarily, can dynamically allocate or adjust the current upper limit. The current control circuit 36 adjusts the current control signal according to the current sensing signal and the current upper limit to achieve an optimized arrangement of the plurality of output currents. For example, the complex output current control can be set as follows according to the user's needs:
安排方式一:當各輸出電流需求未超過各電流上限時,根據各輸出電流需求提供各輸出電流;以及當其中一輸出電流需求超過其電流上限時,將該輸出電流限制於其電流上限。此安排方式中,各電流上限可為固定、亦可為可調。Arrangement mode 1: When the output current demand does not exceed the upper limit of each current, each output current is provided according to each output current demand; and when one of the output current demands exceeds the upper limit of the current, the output current is limited to the upper limit of the current. In this arrangement, the upper limit of each current can be fixed or adjustable.
安排方式二:當複數輸出電流中,一輸出電流的需求未超過其初始設定之電流上限時,可將另一輸出電流的上限調高。例如,可調降一從屬輸出電流的上限,並調高一主要輸出電流的上限。Arrangement 2: When the demand of one output current does not exceed the initial upper limit of the current in the complex output current, the upper limit of the other output current can be increased. For example, the upper limit of a slave output current can be adjusted down and the upper limit of a primary output current can be increased.
安排方式三:設定複數輸出電流的總量上限,並動態分配各輸出電流的上限。主要輸出電流的需求優先被滿足;當主要輸 出電流的需求滿足後,將總量上限減去該主要輸出電流所餘的電流量,分配給其餘的輸出電流。Arrangement 3: Set the upper limit of the total output current and dynamically allocate the upper limit of each output current. The demand for the main output current is prioritized; when the main lose After the demand for the output current is satisfied, the total amount of current remaining by the main output current is subtracted from the upper limit of the total amount, and is distributed to the remaining output current.
須說明的是:以上三種安排方式並不限於各自獨立使用,亦可互相組合。例如,安排方式一、二中,都可以設定總量上限,以及優先滿足主要輸出電流的需求,等等。It should be noted that the above three arrangements are not limited to their independent use, but can also be combined with each other. For example, in the first and second arrangements, the upper limit can be set, and the demand for the main output current can be preferentially met, and so on.
第5圖顯示本發明的第三個實施例。如第5圖所示,多輸出切換式電源供應電路4包含功率級電路41、多輸出電路42、PWM訊號產生電路43、電壓感測電路44、與電流控制電路46。本實施例顯示多輸出切換式電源供應電路4一種更具體的實施例。其中,功率級電路41例如但不限於如圖所示之同步升壓型功率轉換電路,須注意的是,功率級電路41利用一共同的電感L,藉由多輸出電路42,可產生複數輸出電流Io7、Io8。本實施例中舉例顯示複數輸出電流Io7、Io8的產生與控制方式,多輸出電路42包括複數負載開關Q1與Q2,分別設置於複數輸出電流的路徑上(例如但不限於如圖所示,負載開關Q1與輸出端點Vout7耦接;負載開關Q2與輸出端點Vout8耦接),且負載開關Q1、Q2分別根據電流控制訊號而操作。電流控制訊號控制負載開關Q1、Q2的閘極電壓,以決定負載開關Q1、Q2是否完全導通,例如可以配合前述之安排方式一、二、三之控制實施例。Fig. 5 shows a third embodiment of the present invention. As shown in FIG. 5, the multi-output switching power supply circuit 4 includes a power stage circuit 41, a multi-output circuit 42, a PWM signal generating circuit 43, a voltage sensing circuit 44, and a current control circuit 46. This embodiment shows a more specific embodiment of the multi-output switching power supply circuit 4. The power stage circuit 41 is, for example but not limited to, a synchronous boost type power conversion circuit as shown in the figure. It should be noted that the power stage circuit 41 can generate a complex output by using the common inductor L and the multi-output circuit 42. Current Io7, Io8. In this embodiment, the generation and control modes of the complex output currents Io7 and Io8 are shown by way of example. The multi-output circuit 42 includes a plurality of load switches Q1 and Q2 respectively disposed on the path of the complex output current (for example, but not limited to, as shown in the figure). The switch Q1 is coupled to the output terminal Vout7; the load switch Q2 is coupled to the output terminal Vout8), and the load switches Q1, Q2 are respectively operated according to the current control signal. The current control signal controls the gate voltages of the load switches Q1 and Q2 to determine whether the load switches Q1 and Q2 are fully turned on. For example, the control embodiments of the first, second, and third arrangements may be matched.
舉例而言,若輸出電流Io7設有上限,則當輸出電流Io7不超過該上限時,電流控制訊號使對應的負載開關Q1完全導通,此時輸出電流Io7由輸出端點Vout7所連接的負載電路來控制。但在負載開關Q1完全導通的情況下,若電流偵測訊號顯示,輸出電流Io7會超過該上限時,則電流控制訊號控制負載開關Q1的閘極電壓,使其僅部份導通,此時輸 出電流Io7便為負載開關Q1所控制,以使輸出電流Io7不超過該上限。輸出電流Io8亦可用類似的方式控制。For example, if the output current Io7 has an upper limit, when the output current Io7 does not exceed the upper limit, the current control signal causes the corresponding load switch Q1 to be fully turned on, and the output current Io7 is connected to the load circuit connected to the output terminal Vout7. To control. However, when the load switch Q1 is fully turned on, if the current detection signal is displayed and the output current Io7 exceeds the upper limit, the current control signal controls the gate voltage of the load switch Q1 to be partially turned on. The output current Io7 is controlled by the load switch Q1 so that the output current Io7 does not exceed the upper limit. The output current Io8 can also be controlled in a similar manner.
再舉例而言,假設輸出電流Io8為主要輸出電流而Io7為從屬輸出電流。當輸出電流Io7不超過其初始設定上限時,不僅可使負載開關Q1完全導通,且可調高主要輸出電流Io8的上限。亦即,當主要輸出電流Io8超過其初始設定上限、但未超過其調高後的上限時,則仍使負載開關Q2完全導通。As another example, assume that the output current Io8 is the primary output current and Io7 is the slave output current. When the output current Io7 does not exceed its initial set upper limit, not only the load switch Q1 can be fully turned on, but also the upper limit of the main output current Io8 can be adjusted. That is, when the main output current Io8 exceeds its initial set upper limit but does not exceed its upper limit after the increase, the load switch Q2 is still fully turned on.
再舉例而言,假設輸出電流Io7、Io8的總量設有上限,且輸出電流Io8為主要輸出電流而Io7為從屬輸出電流。負載開關Q2保持完全導通,而電流控制電路46偵測輸出電流Io8並計算該總量上限和輸出電流Io8的差值,將此差值分配給輸出電流Io7。當此差值高於輸出端點Vout7對輸出電流Io7的需求時,負載開關Q1完全導通,此時輸出電流Io7由輸出端點Vout7所連接的負載電路來控制。但當此差值低於輸出端點Vout7對輸出電流Io7的需求時,此差值便成為輸出電流Io7的上限,電流控制訊號控制負載開關Q1的閘極電壓,使其僅部份導通,此時輸出電流Io7便為負載開關Q1所控制,以使輸出電流Io7不超過該上限。For another example, assume that the total amount of the output currents Io7, Io8 has an upper limit, and the output current Io8 is the main output current and Io7 is the slave output current. The load switch Q2 remains fully turned on, and the current control circuit 46 detects the output current Io8 and calculates the difference between the upper limit of the total amount and the output current Io8, and distributes the difference to the output current Io7. When the difference is higher than the demand of the output terminal Iout7 by the output terminal Vout7, the load switch Q1 is fully turned on, and the output current Io7 is controlled by the load circuit connected to the output terminal Vout7. However, when the difference is lower than the output end current Vout7 requires the output current Io7, the difference becomes the upper limit of the output current Io7, and the current control signal controls the gate voltage of the load switch Q1 to make it only partially conductive. The output current Io7 is controlled by the load switch Q1 so that the output current Io7 does not exceed the upper limit.
第6圖顯示本發明的第四個實施例。在本實施例中,多輸出切換式電源供應電路5例如應用於電力銀行(power bank),因此,多輸出切換式電源供應電路5的輸入電壓Vin來自於一電池電路25,如圖所示。本實施例旨在說明,當本發明應用於電力銀行時包含電池,在其他情況則不必然需要包含電池。Fig. 6 shows a fourth embodiment of the present invention. In the present embodiment, the multi-output switching power supply circuit 5 is applied, for example, to a power bank, and therefore, the input voltage Vin of the multi-output switching power supply circuit 5 is derived from a battery circuit 25 as shown. This embodiment is intended to illustrate that the battery is included when the present invention is applied to a power bank, and it is not necessarily required to include a battery in other cases.
以上已針對較佳實施例來說明本發明,唯以上所述者,僅係為使熟悉本技術者易於了解本發明的內容而已,並非用來限定本發明之權利範圍。在本發明之相同精神下,熟悉本 技術者可以思及各種等效變化。例如,在所示各實施例電路中,可插入不影響訊號主要意義的元件,如其他開關等;又例如,本發明亦可以應用於單純限制輸出電流的情況,而不限於必須應用於超出電路所能負荷的情況;又例如,當輸出電壓低於一預設位準時,調整至少一輸出電流之方式,並不限於應用於無電流感測電路的狀況中,亦可以應用於有電流感測電路或/與電流控制電路的情況。凡此種種,皆可根據本發明的教示類推而得,因此,本發明的範圍應涵蓋上述及其他所有等效變化。The present invention has been described with reference to the preferred embodiments thereof, and the present invention is not intended to limit the scope of the present invention. In the same spirit of the present invention, familiar with this The technician can think of various equivalent changes. For example, in the circuit of each embodiment shown, components that do not affect the main meaning of the signal, such as other switches, can be inserted; for example, the present invention can also be applied to the case of simply limiting the output current, and is not limited to being applied to the excess circuit. The load can be applied; for example, when the output voltage is lower than a preset level, the manner of adjusting at least one output current is not limited to the case of applying the currentless sensing circuit, and can also be applied to current sensing. The case of a circuit or / and a current control circuit. All such modifications may be made in accordance with the teachings of the present invention, and the scope of the present invention should be construed to cover the above and other equivalents.
1,2,3,4‧‧‧多輸出切換式電源供應器1,2,3,4‧‧‧Multiple output switching power supply
11,23,33,43‧‧‧PWM訊號產生電路11,23,33,43‧‧‧PWM signal generation circuit
12,13,24,34,44‧‧‧電壓感測電路12,13,24,34,44‧‧‧ voltage sensing circuit
14,15,21,31,41‧‧‧功率級電路14,15,21,31,41‧‧‧Power level circuits
22,32,42‧‧‧多輸出電路22,32,42‧‧‧Multiple output circuits
25‧‧‧電池電路25‧‧‧Battery Circuit
36,46‧‧‧電流控制電路36,46‧‧‧ Current Control Circuit
FB1,FB2‧‧‧反饋訊號FB1, FB2‧‧‧ feedback signal
Io1,Io2,Io3,Io4,Io5,Io6,Io7,Io8‧‧‧輸出電流Io1, Io2, Io3, Io4, Io5, Io6, Io7, Io8‧‧‧ output current
L‧‧‧電感L‧‧‧Inductance
PWM1,PWM2,PWM3‧‧‧PWM訊號(太靠近會誤會)PWM1, PWM2, PWM3‧‧‧PWM signal (too close to misunderstanding)
Q1,Q2‧‧‧負載開關Q1, Q2‧‧‧ load switch
Vin‧‧‧輸入電壓Vin‧‧‧Input voltage
Vout1,Vout2,Vout3,Vout4,Vout5,Vout6,Vout7,Vout8‧‧‧輸出端點Vout1, Vout2, Vout3, Vout4, Vout5, Vout6, Vout7, Vout8‧‧‧ Output Endpoints
第1圖顯示習知多輸出切換式電源供應電路1的示意圖。FIG. 1 shows a schematic diagram of a conventional multi-output switching power supply circuit 1.
第2A-2J圖顯示各種型式的同步或非同步之降壓型、升壓型、反壓型、或升降壓型功率轉換電路。Figure 2A-2J shows various types of synchronous or non-synchronous buck, boost, back-pressure, or buck-boost power conversion circuits.
第3圖,顯示本發明第一個實施例。Fig. 3 shows a first embodiment of the present invention.
第4圖顯示本發明的第二個實施例。Figure 4 shows a second embodiment of the invention.
第5圖顯示本發明的第三個實施例。Fig. 5 shows a third embodiment of the present invention.
第6圖顯示本發明的第四個實施例。Fig. 6 shows a fourth embodiment of the present invention.
2‧‧‧多輸出切換式電源供應器2‧‧‧Multiple output switching power supply
21‧‧‧功率級電路21‧‧‧Power Stage Circuit
22‧‧‧多輸出電路22‧‧‧Multiple output circuits
23‧‧‧PWM訊號產生電路23‧‧‧PWM signal generation circuit
24‧‧‧電壓感測電路24‧‧‧ voltage sensing circuit
Io3,Io4‧‧‧輸出電流Io3, Io4‧‧‧ output current
PWM3‧‧‧PWM訊號PWM3‧‧‧PWM signal
Vin‧‧‧輸入電壓Vin‧‧‧Input voltage
Vout3,Vout4‧‧‧輸出端點Vout3, Vout4‧‧‧ output endpoint
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