TWI420275B - Switching capacitor voltage regulator - Google Patents
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Description
本發明係有關於一種穩壓器，特別是指一種切換式電容穩壓器。
The present invention relates to a voltage regulator, and more particularly to a switched capacitor voltage regulator.
現今隨著科技的進步，進而發展出許多電子產品，以因應民眾的需求，該些電子產品的功能越來越為強大，而帶給現今民眾在生活上許多便利。現今電子產品發展越來越為精密，也因為如此，在精密的電子產品中，電源管理方面顯得越來越為重要，在多樣性的電子產品應用中，都需要穩定的內建電壓源。
以切換電容為基礎的電荷幫浦(即切換式電容穩壓器)，因其具有較低之電磁干擾(EMI/EMC)，因而廣泛地應用於各種電子產品，尤其是手持式電子產品，例如個人數位助理(PDA)與行動電話。然而隨著手持式電子產品的發展，各種功能陸續整合成單一晶片(SOC)，晶片內部所需的供給電源之電壓位準也隨之多樣化。手持式電子產品之電池通常僅提供2.7V左右之單一電壓Vsup，但因應電子產品功能上的需求，需藉由電荷幫浦將此2.7V左右之電壓轉換為各種電壓。例如藉由電荷幫浦進行兩倍壓之電壓轉換，即產生2*Vsup之電壓 (約4.5V~5.4V左右，視負載電流大小而定)，與進行負一倍壓之電壓轉換，即產生-1*Vsup之電壓(約-2V~-2.7V左右，視負載電流大小而定)。當然亦可能同時存在更高倍數之正與負倍壓電路，例如:在小尺寸的液晶顯示驅動電路中即需要正七、正八倍壓電路與負五、負六倍壓電路。
由上述說明可知，切換式電容穩壓器大都應用於一晶片，當晶片之外部提供的電壓低於內部需求時，就必須透過切換式電容穩壓器依據外部提供電壓產生高於外部提供電壓的電壓，以提供晶片所需的電源。現有切換式電容穩壓器皆具有一回授電路，其用於限制切換式電容穩壓器之輸出電壓，以避免輸出電壓高於一安全電壓，而造成晶片之內部電路發生損壞。此外，當切換式電容穩壓器提供輸出電壓給負載時，負載電流會使切換式電容穩壓器之穩壓電容的電荷減少，使輸出電壓下降且低於目標電壓，此時回授電路會控制切換式電容穩壓器提高輸出電壓，以符合目標電壓。然而，回授電路於控制切換式電容穩壓器提高輸出電壓之過程，係會造成輸出電壓過高之情形，而造成輸出電壓會產生明顯的抖動，如此即會影響切換式電容穩壓器提供輸出電壓的穩定性，進而影響切換式電容穩壓器之效能。
因此，本發明即在針對上述問題而提出一種切換式電容穩壓器，係可改善上述習用缺點，使可解決上述問題。
Nowadays, with the advancement of technology, many electronic products have been developed to meet the needs of the people. The functions of these electronic products are becoming more and more powerful, and bring convenience to the people today. Nowadays, the development of electronic products is becoming more and more sophisticated. Because of this, in the precision electronic products, power management is becoming more and more important. In the application of diverse electronic products, stable built-in voltage sources are needed.
Switched capacitor-based charge pumps (switched capacitor regulators), because of their low electromagnetic interference (EMI/EMC), are widely used in a variety of electronic products, especially handheld electronic products, such as Personal digital assistant (PDA) and mobile phone. However, with the development of handheld electronic products, various functions are gradually integrated into a single chip (SOC), and the voltage level of the power supply required inside the chip is also diversified. The battery of the handheld electronic product usually only provides a single voltage Vsup of about 2.7V, but in response to the functional requirements of the electronic product, the voltage of about 2.7V is converted into various voltages by the charge pump. For example, by a charge pump to perform voltage conversion of twice the voltage, that is, a voltage of 2*Vsup (about 4.5V~5.4V, depending on the magnitude of the load current) is generated, and a voltage conversion of a negative voltage is generated, that is, a voltage is generated. -1*Vsup voltage (about -2V~-2.7V, depending on the load current). Of course, it is also possible to have higher and higher multiple positive and negative voltage doubler circuits. For example, in a small size liquid crystal display driving circuit, a positive seven, a positive eight voltage circuit and a negative five and a negative six voltage circuit are required.
As can be seen from the above description, switched capacitor regulators are mostly applied to a chip. When the voltage supplied from the outside of the chip is lower than the internal demand, it is necessary to generate a voltage higher than the externally supplied voltage through the switched capacitor regulator according to the externally supplied voltage. Voltage to provide the power required by the wafer. The existing switched capacitor regulators each have a feedback circuit for limiting the output voltage of the switched capacitor regulator to prevent the output voltage from being higher than a safe voltage and causing damage to the internal circuitry of the chip. In addition, when the switched capacitor regulator provides the output voltage to the load, the load current will reduce the charge of the Zener capacitor of the switched capacitor regulator, causing the output voltage to drop below the target voltage. Control the switched capacitor regulator to increase the output voltage to match the target voltage. However, the feedback circuit in the process of controlling the switching capacitor regulator to increase the output voltage causes the output voltage to be too high, which causes the output voltage to produce significant jitter, which will affect the switching capacitor regulator. The stability of the output voltage, which in turn affects the performance of the switched capacitor regulator.
Therefore, the present invention has been directed to a switching capacitor regulator in view of the above problems, which can improve the above-mentioned conventional disadvantages and solve the above problems.
本發明之主要目的，在於提供一種切換式電容穩壓器，其藉由切換式電容穩壓器中之切換式電容電路產生一輸出電壓，並藉由一控制電路控制回授電路，而控制切換式電容電路產生穩定的輸出電壓，以達到提供良好、穩定與不抖動之輸出電壓的目的。
本發明之次要目的，在於提供一種切換式電容穩壓器，其可提高回授迴路之相位邊限與頻寬，進而提高切換式電容穩壓器的效能。
本發明切換式電容穩壓器，其包含有一切換式電容電路，切換式電容電路依據一輸入電壓產生一輸出電壓；一感測元件感測切換式電容電路之一電壓產生一回授電壓；一回授電路依據回授電壓產生一回授訊號，回授訊號控制切換式電容電路，而調整切換式電容電路輸出電壓；一控制電路耦接於感測元件與回授電路之間，且控制電路在輸入電壓充電切換式電容電路時，則會截止傳輸回授電壓至回授電路，以截止回授電路依據回授電壓調整輸出電壓。如此，本發明經由控制電路控制切換式電容電路產生輸出電壓，以達到可提供具良好、穩定與不抖動之輸出電壓的目的。
The main purpose of the present invention is to provide a switched capacitor regulator that generates an output voltage by a switched capacitor circuit in a switched capacitor regulator and controls the switching circuit by a control circuit to control the switching. The capacitive circuit produces a stable output voltage for the purpose of providing a good, stable and non-jittering output voltage.
A secondary object of the present invention is to provide a switched capacitor regulator that can increase the phase margin and bandwidth of the feedback loop, thereby improving the performance of the switched capacitor regulator.
The switched capacitor regulator of the present invention comprises a switched capacitor circuit, wherein the switched capacitor circuit generates an output voltage according to an input voltage; and a sensing component senses a voltage of the switched capacitor circuit to generate a feedback voltage; The feedback circuit generates a feedback signal according to the feedback voltage, the feedback signal controls the switched capacitor circuit, and adjusts the output voltage of the switched capacitor circuit; a control circuit is coupled between the sensing component and the feedback circuit, and the control circuit When the input voltage is charged to the switched capacitor circuit, the feedback feedback voltage is turned off to the feedback circuit, and the output feedback voltage is adjusted according to the feedback voltage. Thus, the present invention controls the switching capacitor circuit to generate an output voltage via the control circuit to achieve the purpose of providing a good, stable and non-jittering output voltage.
茲為使 貴審查委員對本發明之技術特徵及所達成之功效更有進一步之瞭解與認識，謹佐以較佳之實施例圖及配合詳細之說明，說明如後：
首先，請參閱第一圖，係本發明之一較佳實施例之切換式電容穩壓器的電路圖。如圖所示，本發明之切換式電容穩器包含一切換式電容電路10、一感測元件RFB
、一控制電路20與一回授電路30。切換式電容電路10接收一輸入電壓VIN
，並依據輸入電壓VIN
而產生一輸出電壓VOUT
，切換式電容電路10 為一電荷幫浦，感測元件RFB
感測切換式電容電路10之一電壓，而產生一回授電壓VFB
。於此實施例中，感測元件RFB
係感測切換式電容電路10之輸出電壓VOUT
，而產生回授電壓VFB
。回授電路30依據回授電壓VFB
而產生一回授訊號，以控制切換式電容電路10，使切換式電容電路10調整輸出電壓VOUT
，而穩定切換式電容穩壓器的輸出電壓VOUT
。
承接上述，控制電路20耦接於感測元件RFB
與回授電路30之間，控制電路20於輸入電壓VIN
充電切換式電容電路10時，係會截止傳輸回授電壓VFB
至回授電路30，以截止回授電路30依據回授電壓VFB
調整切換式電容電路10之輸出電壓VOUT
，而是傳輸一第一參考電壓VREF1
至回授電路30，以供回授電路30依據第一參考電壓VREF1
產生回授訊號，而控制切換式電容電路10調整輸出電壓VOUT
。如此可避免回授電路30於控制切換式電容電路10而調整輸出電壓VOUT
之過程，過度提高輸出電壓VOUT
而產生抖動之情形，所以本發明之切換式電容穩壓器可提供具良好、穩定與不抖動之輸出電壓VOUT
，而提高切換式電容穩壓器之效能。
請復參閱第一圖，以下係配合第一圖詳細說明本發明之切換式電容穩壓器。如圖所式，切換式電容電路10包含一第一開關11、一第一電容CFL
、一第二開關13與一第二電容CL
，第一開關11具有一第一端與一第二端，第一端接收輸入電壓VIN
，第一開關11接收一反相控制訊號CKB
，而受控於反相控制訊號CKB
。第一電容CFL
耦接至第一開關11之第二端與回授電路30之間，且輸入電壓VIN
經過第一開關11對第一電容CFL
充電，第一電容CFL
之一較佳實施例為一飛馳電容（Flying Capacitor）。第二開關13具有一第一端與一第二端，第一端耦接於第一電容CFL
與第一開關11之第二端，第二電容CL
耦接於第二開關13之第二端與接地端之間，第二開關13接收一控制訊號CK，而受控於控制訊號CK，控制訊號CK導通第二開關13時，第一電容CFL
之電壓會經第二開關13而對第二電容CL
充電，以產生輸出電壓VOUT
。第二電容CL
之一較佳實施例為一穩壓電容，第一開關11和第二開關13之一較佳實施例為一場效電晶體。
承接上述，反相控制訊號CKB
係反相於控制訊號CK，即反相控制訊號CKB
控制第一開關11導通，而讓輸入電壓VIN
對第一電容CFL
進行充電時，控制訊號CK會控制第二開關13截止。之後，控制訊號CK會控制第二開關13導通，而反相控制訊號CKB
控制第一開關11截止，使第一電容CFL
於第一開關11導通時所儲存之電荷透過第二開關13，而傳送至第二電容CL
，即對第二電容CL
進行充電，以產生切換式電容穩壓器之輸出電壓VOUT
。
此外，於第一圖之實施例中，感測元件RFB
耦接於第二電容CL
與接地端之間，以感測切換式電容電路10之第二電容CL
之電壓，即感測切換式電容電路10所產生的輸出電壓VOUT
，而產生回授電壓VFB
。一電流源ILOAD
耦接於切換式電容電路10之第二電容CL
與接地端之間，即電流源ILOAD
相當於切換式電容穩壓器耦接一負載時，該負載所需之電流。其中，感測元件RFB
之一較佳實施例為一感測電阻。
請復參閱第一圖，控制電路20包含一第一開關22與一第二開關24。第一開關22耦接於感測元件RFB
與回授電路30之間，且接收反相控制訊號CKB
與控制訊號CK，而受控於反相控制訊號CKB
與控制訊號CK。當反相控制訊號CKB
為高位準而截止第一開關11，且控制訊號CK為低位準而導通第二開關13時，控制電路20之第一開關22會被導通，以傳送回授電壓VFB
至回授電路30，以供回授電路30依據回授電壓VFB
產生回授訊號，而控制切換式電容電路10，以調整輸出電壓VOUT
。控制電路20之第一開關22之一較佳實施例為一傳輸閘。
第二開關24耦接於一第一參考電壓VREF1
與回授電路30之間，即第二開關24之一端耦接於第一開關22與回授電路30，第二開關24之另一端耦接於第一參考電壓VREF1
，第二開關24且接收反相控制訊號CKB
而受控於反相控制訊號CKB
。當反相控制訊號CKB
為低位準而導通第一開關11，且控制訊號CK為高位準而截止第二開關13時，控制電路20之第一開關22會被截止，以停止傳輸回授電壓VFB
至回授電路30，而第二開關24會被導通，以傳輸第一參考電壓VREF1
至回授電路30。第二開關24之一較佳實施例為一場效電晶體。
當切換式電容電路10之第一開關11導通，而第二開關13截止時，若電流源ILOAD
提供大電流至負載，而使輸出電壓VOUT
下降時，感測元件RFB
感測輸出電壓VOUT
而產生之回授電壓VFB
的位準即會下降，如此回授電路30即會依據回授電壓VFB
控制切換式電容電路10提高輸出電壓VOUT
。然而，由於切換式電容電路10之第二開關13為截止狀態，所以回授迴路為開迴路狀態，而無法調整輸出電壓VOUT
。一旦，第一開關11截止而第二開關13導通時，切換式電容電路10即會依據回授電路30之回授訊號而過度提高輸出電壓VOUT
之位準，而造成輸出電壓發生VOUT
抖動的現象。
承接上述，由於本發明之控制電路20會在切換式電容電路10之第一開關11導通而第二開關13截止時，停止傳輸回授電壓VFB
至回授電路30，即控制電路20會在切換式電容電路10之第一開關11導通，而輸入電壓VIN
充電切換式電容電路10之第一電容CFL
時，停止傳輸回授電壓VFB
至回授電路30，以截止回授電路30於此狀態下，依據回授電壓VFB
產生回授訊號，而調整切換式電容穩壓器之輸出電壓VOUT
，以避免之後第二開關13導通時，切換式電容電路10過度提升輸出電壓VOUT
，而發生輸出電壓VOUT
具有抖動的現象。
由於在輸入電壓VIN
對切換式電容電路10之第一電容CFL
進行充電時，控制電路20之第一開關22係會隔開回授電路30與感測元件RFB
，以避免輸出電壓VOUT
具有抖動情形。此時，回授電路30仍需接收電壓，以維持切換式電容穩壓器正常運作，所以輸入電壓VIN
對切換式電容電路10之第一電容CFL
進行充電時，控制電路20之第二開關24係會導通，以傳送第一參考電壓VREF1
至回授電路30，第一參考電壓VREF1
大於輸入電壓VIN
充電切換式電容電路10之第一電容CFL
時而感測元件RFB
所產生之回授電壓VFB
，回授電路30依據第一參考電壓VREF1
產生回授訊號，以控制切換式電容電路10維持穩定輸出電壓VOUT
。
承接上述，之後切換式電容電路10之第一開關11截止且第二開關13導通時，由於回授迴路即為閉迴路，所以控制電路20之第一開關22即會導通，以傳輸回授電壓VFB
至回授電路30，以供回授電路30依據回授電壓VFB
產生回授訊號，而控制切換式電容電路10， 以調整輸出電壓VOUT
，以穩定切換式電容穩壓器之輸出電壓VOUT
。此外，控制電路20之第二開關24會截止，而停止傳輸第一參考電壓VREF1
至回授電路30。
請復參閱第一圖，回授電路30包含一反相器32、一可調整阻抗元件36與一差動放大器34。反相器32之一輸入端接收一輸入訊號，於此實施例中，輸入訊號為控制訊號CK，且反相器32之輸出端耦接切換式電容電路10之第一電容CFL
，反相器32依據控制訊號CK，而產生一輸出訊號，以控制切換式電容電路10。可調整阻抗元件36具有一第一端與一第二端，可調整阻抗元件36之第一端耦接於一供應電壓VCC
，可調整阻抗元件36之第二端耦接於反相器32，以調整反相器32之輸出訊號，可調整阻抗元件36於此實施例中為一場效電晶體，其亦可為一可變電阻。阻抗元件36之阻抗降低時，反相器32之輸出訊號即會控制切換式電容電路10提升輸出電壓VOUT
。
承接上述，差動放大器34之一正輸入端接收回授電壓VFB
，而一負輸入端接收一第二參考電壓VREF2
，差動放大器34依據回授電壓VFB
與第二參考電壓VREF2
而產生回授訊號，即差動放大器34比較回授電壓VFB
與第二參考電壓VREF2
而產生回授訊號，以調整可調整阻抗元件36之阻抗，而控制調整反相器32之輸出訊號，進而調整切換式電容穩壓器之輸出電壓VOUT
，所以回授訊號即用於調整阻抗元件36之阻抗，而控制切換式電容電路10，以調整輸出電壓VOUT
。此外，控制電路20停止傳輸回授電壓VFB
至回授電路30時，控制電路20會依據控制電路20所提供之第一參考電壓VREF1
至回授電路30，以產生回授訊號，由於第一參考電壓VREF1
之位準會高於第二參考電壓VREF2
，所以回授訊號並不會降低可調整阻抗元件36之阻抗，所以可避免切換式電容電路10過度提高輸出電壓VOUT
，而產生抖動之情形。
請參閱第二圖，係為本發明之另一較佳實施例之切換式電容穩器的電路圖。請一併參閱第一圖，如圖所示，此實施例不同於第一圖實施例之處，在於本實施之感測元件RFB
耦接切換式電容電路10之第一電容CFL
，以感測第一電容CFL
之電壓而產生回授電壓VFB
，第一電容CFL
之電壓係關聯於輸出電壓VOUT
，所以感測元件RFB
感測第一電容CFL
之電壓所產生之回授電壓VFB
，仍可表示輸出電壓VOUT
之狀態。此外，本實施例之第二開關13導通時，第二開關13的等效電阻係會增加第二電容CL
的等效串聯電阻(Equivalent Series Resistance，ESR)，如此回授迴路會具有較佳的相位邊限（Phase Margin）以及頻寬，如此可增加切換式電容穩壓器的穩定度，進而提高切換式電容穩壓器的效能。
綜上所述，本發明之切換式電容穩壓器包含切換式電容電路、感測元件、回授電路與控制電路，切換式電容電路依據輸入電壓產生輸出電壓，感測元件感測切換式電容電路之電壓，而產生回授電壓，回授電路依據感測元件所產生的回授電壓產生回授訊號，切換式電容電路依據回授訊號而調整輸出電壓，控制電路耦接於感測元件與回授電路之間，且在輸入電壓充電切換式電容電路時，則會截止回授電路依據回授電壓而調整輸出電壓，以提供具有良好、穩定、不抖動的輸出電壓，以增進切換式電容穩壓器之效能。
故本發明實為一具有新穎性、進步性及可供產業上利用者，應符合我國專利法專利申請要件無疑，爰依法提出發明專利申請，祈鈞局早日賜准專利，至感為禱 。
惟以上所述者，僅為本發明一較佳實施例而已，並非用來限定本發明實施之範圍，故舉凡依本發明申請專利範圍所述之形狀、構造、特徵及精神所為之均等變化與修飾，均應包括於本發明之申請專利範圍內。
In order to give your reviewers a better understanding and understanding of the technical features of the present invention and the efficacies achieved, please refer to the preferred embodiment diagrams and detailed descriptions to illustrate:
First, please refer to the first figure, which is a circuit diagram of a switched capacitor regulator according to a preferred embodiment of the present invention. As shown, the switched capacitive resonator of the present invention includes a switched capacitor circuit 10, a sensing component R FB , a control circuit 20 and a feedback circuit 30. The switched capacitor circuit 10 receives an input voltage V IN and generates an output voltage V OUT according to the input voltage V IN . The switched capacitor circuit 10 is a charge pump, and the sensing element R FB senses the switched capacitor circuit 10 . A voltage is generated to generate a feedback voltage V FB . In this embodiment, the sensing element R FB senses the output voltage V OUT of the switched capacitor circuit 10 to generate a feedback voltage V FB . The feedback circuit 30 generates a feedback signal according to the feedback voltage V FB to control the switched capacitor circuit 10, so that the switched capacitor circuit 10 adjusts the output voltage V OUT , and stabilizes the output voltage of the switched capacitor regulator V OUT .
In the above, the control circuit 20 is coupled between the sensing element R FB and the feedback circuit 30. When the input voltage V IN is charged to the switched capacitor circuit 10, the feedback voltage V FB is turned off to feedback. The circuit 30 adjusts the output voltage V OUT of the switched capacitor circuit 10 according to the feedback voltage V FB by the cutoff feedback circuit 30, and transmits a first reference voltage V REF1 to the feedback circuit 30 for use by the feedback circuit 30. The first reference voltage V REF1 generates a feedback signal, and the control switching capacitor circuit 10 adjusts the output voltage V OUT . This avoids the feedback circuit 30 to control the switching circuit 10 to adjust the capacitor voltage V OUT of the output process, the output voltage V OUT increases excessively generated jitter of the case, the switching regulator capacitor of the present invention may be provided with good, Stable and non-jittering output voltage V OUT improves the performance of switched capacitor regulators.
Please refer to the first figure. The following is a detailed description of the switched capacitor regulator of the present invention in conjunction with the first figure. As shown in the figure, the switched capacitor circuit 10 includes a first switch 11, a first capacitor C FL , a second switch 13 and a second capacitor C L . The first switch 11 has a first end and a second switch The first terminal receives the input voltage V IN , and the first switch 11 receives an inverted control signal CK B and is controlled by the inverted control signal CK B . The first capacitor C FL is coupled between the second end of the first switch 11 and the feedback circuit 30 , and the input voltage V IN is charged to the first capacitor C FL through the first switch 11 , and one of the first capacitors C FL is compared A preferred embodiment is a Flying Capacitor. The second switch 13 has a first end and a second end. The first end is coupled to the second end of the first capacitor C FL and the first switch 11 , and the second capacitor C L is coupled to the second switch 13 . Between the two ends and the ground, the second switch 13 receives a control signal CK, and is controlled by the control signal CK. When the control signal CK turns on the second switch 13, the voltage of the first capacitor C FL passes through the second switch 13 The second capacitor C L is charged to generate an output voltage V OUT . A preferred embodiment of the second capacitor C L is a voltage stabilizing capacitor. A preferred embodiment of the first switch 11 and the second switch 13 is a field effect transistor.
In response to the above, the inverted control signal CK B is inverted to the control signal CK, that is, the inverted control signal CK B controls the first switch 11 to be turned on, and when the input voltage V IN charges the first capacitor C FL , the control signal CK The second switch 13 is controlled to be turned off. After that, the control signal CK controls the second switch 13 to be turned on, and the inverted control signal CK B controls the first switch 11 to be turned off, so that the charge stored by the first capacitor C FL when the first switch 11 is turned on passes through the second switch 13 . And transmitting to the second capacitor C L , that is, charging the second capacitor C L to generate the output voltage V OUT of the switched capacitor regulator.
In addition, in the embodiment of the first embodiment, the sensing component R FB is coupled between the second capacitor C L and the ground to sense the voltage of the second capacitor C L of the switched capacitor circuit 10, that is, sensing. The output voltage V OUT generated by the switched capacitor circuit 10 generates a feedback voltage V FB . A current source I LOAD is coupled between the second capacitor C L of the switched capacitor circuit 10 and the ground, that is, the current source I LOAD is equivalent to the current required by the load when the switched capacitor regulator is coupled to a load. . One of the preferred embodiments of the sensing element R FB is a sensing resistor.
Referring to the first figure, the control circuit 20 includes a first switch 22 and a second switch 24. The first switch 22 is coupled between the sensing element R FB and the feedback circuit 30, and receives the inverted control signal CK B and the control signal CK, and is controlled by the inverted control signal CK B and the control signal CK. When the inversion control signal CK B is at a high level and the first switch 11 is turned off, and the control signal CK is at a low level and the second switch 13 is turned on, the first switch 22 of the control circuit 20 is turned on to transmit the feedback voltage V. The FB is sent to the feedback circuit 30 for the feedback circuit 30 to generate a feedback signal according to the feedback voltage V FB , and the switched capacitor circuit 10 is controlled to adjust the output voltage V OUT . A preferred embodiment of the first switch 22 of the control circuit 20 is a transfer gate.
The second switch 24 is coupled between a first reference voltage V REF1 and the feedback circuit 30, that is, one end of the second switch 24 is coupled to the first switch 22 and the feedback circuit 30, and the other end of the second switch 24 is coupled. Connected to the first reference voltage V REF1 , the second switch 24 receives the inverted control signal CK B and is controlled by the inverted control signal CK B . When the inversion control signal CK B is at a low level and the first switch 11 is turned on, and the control signal CK is at a high level and the second switch 13 is turned off, the first switch 22 of the control circuit 20 is turned off to stop transmitting the feedback voltage. V FB to feedback circuit 30, and second switch 24 is turned on to transmit first reference voltage V REF1 to feedback circuit 30. A preferred embodiment of the second switch 24 is a field effect transistor.
When the first switch 11 of the switched capacitor circuit 10 is turned on and the second switch 13 is turned off, if the current source I LOAD supplies a large current to the load, and the output voltage V OUT decreases, the sensing element R FB senses the output voltage. The level of the feedback voltage V FB generated by V OUT is lowered, so that the feedback circuit 30 controls the switching capacitor circuit 10 to increase the output voltage V OUT according to the feedback voltage V FB . However, since the second switch 13 of the switched capacitor circuit 10 is in an off state, the feedback loop is in an open loop state, and the output voltage V OUT cannot be adjusted. Once the first switch 11 is turned off and the second switch 13 is turned on, the switched capacitor circuit 10 excessively raises the level of the output voltage V OUT according to the feedback signal of the feedback circuit 30, causing V OUT jitter of the output voltage. The phenomenon.
In the above, the control circuit 20 of the present invention stops transmitting the feedback voltage V FB to the feedback circuit 30 when the first switch 11 of the switched capacitor circuit 10 is turned on and the second switch 13 is turned off, that is, the control circuit 20 is The first switch 11 of the switched capacitor circuit 10 is turned on, and when the input voltage V IN charges the first capacitor C FL of the switched capacitor circuit 10, the transmission of the feedback voltage V FB to the feedback circuit 30 is stopped to turn off the feedback circuit 30. In this state, the feedback voltage is generated according to the feedback voltage V FB , and the output voltage V OUT of the switched capacitor regulator is adjusted to avoid the switching capacitor circuit 10 excessively raising the output voltage V when the second switch 13 is turned on later. OUT , and the output voltage V OUT has a jitter phenomenon.
Since the first capacitor C FL of the switched capacitor circuit 10 is charged at the input voltage V IN , the first switch 22 of the control circuit 20 separates the feedback circuit 30 from the sensing element R FB to avoid the output voltage V. OUT has a jitter situation. At this time, the feedback circuit 30 still needs to receive the voltage to maintain the normal operation of the switched capacitor regulator, so when the input voltage V IN charges the first capacitor C FL of the switched capacitor circuit 10, the second of the control circuit 20 The switch 24 is turned on to transmit the first reference voltage V REF1 to the feedback circuit 30. The first reference voltage V REF1 is greater than the input voltage V IN of the first capacitor C FL of the charge switching capacitor circuit 10 and the sensing element R FB The feedback voltage V FB is generated, and the feedback circuit 30 generates a feedback signal according to the first reference voltage V REF1 to control the switched capacitor circuit 10 to maintain the stable output voltage V OUT .
After receiving the above, after the first switch 11 of the switched capacitor circuit 10 is turned off and the second switch 13 is turned on, since the feedback loop is a closed loop, the first switch 22 of the control circuit 20 is turned on to transmit the feedback voltage. The V FB is sent to the feedback circuit 30 for the feedback circuit 30 to generate a feedback signal according to the feedback voltage V FB , and the switched capacitor circuit 10 is controlled to adjust the output voltage V OUT to stabilize the output of the switched capacitor regulator Voltage V OUT . In addition, the second switch 24 of the control circuit 20 is turned off, and the transmission of the first reference voltage V REF1 to the feedback circuit 30 is stopped.
Referring to the first figure, the feedback circuit 30 includes an inverter 32, an adjustable impedance element 36 and a differential amplifier 34. An input terminal of the inverter 32 receives an input signal. In this embodiment, the input signal is the control signal CK, and the output end of the inverter 32 is coupled to the first capacitor C FL of the switched capacitor circuit 10, and is inverted. The device 32 generates an output signal according to the control signal CK to control the switched capacitor circuit 10. The adjustable impedance component 36 has a first end and a second end. The first end of the adjustable impedance component 36 is coupled to a supply voltage V CC , and the second end of the adjustable impedance component 36 is coupled to the inverter 32 . In order to adjust the output signal of the inverter 32, the adjustable impedance element 36 is a field effect transistor in this embodiment, which may also be a variable resistor. When the impedance of the impedance element 36 decreases, the output signal of the inverter 32 controls the switched capacitor circuit 10 to boost the output voltage V OUT .
In response to the above, one positive input terminal of the differential amplifier 34 receives the feedback voltage V FB , and a negative input terminal receives a second reference voltage V REF2 . The differential amplifier 34 is based on the feedback voltage V FB and the second reference voltage V REF2 . The feedback signal is generated, that is, the differential amplifier 34 compares the feedback voltage V FB with the second reference voltage V REF2 to generate a feedback signal to adjust the impedance of the adjustable impedance component 36, and controls the output signal of the adjustment inverter 32. Then, the output voltage V OUT of the switched capacitor regulator is adjusted, so the feedback signal is used to adjust the impedance of the impedance element 36, and the switched capacitor circuit 10 is controlled to adjust the output voltage V OUT . In addition, when the control circuit 20 stops transmitting the feedback voltage V FB to the feedback circuit 30, the control circuit 20 generates a feedback signal according to the first reference voltage V REF1 provided by the control circuit 20 to the feedback circuit 30. The reference voltage V REF1 is higher than the second reference voltage V REF2 , so the feedback signal does not lower the impedance of the adjustable impedance element 36, so that the switched capacitor circuit 10 can be prevented from excessively increasing the output voltage V OUT . The situation of jitter.
Please refer to the second figure, which is a circuit diagram of a switched capacitor stabilizer according to another preferred embodiment of the present invention. Referring to the first figure, as shown in the figure, the embodiment is different from the first embodiment in that the sensing component R FB of the present embodiment is coupled to the first capacitor C FL of the switched capacitor circuit 10 to Sensing the voltage of the first capacitor C FL to generate the feedback voltage V FB , the voltage of the first capacitor C FL is related to the output voltage V OUT , so the sensing element R FB senses the voltage of the first capacitor C FL The feedback voltage V FB can still indicate the state of the output voltage V OUT . In addition, when the second switch 13 of the embodiment is turned on, the equivalent resistance of the second switch 13 increases the Equivalent Series Resistance (ESR) of the second capacitor C L , so that the feedback loop is better. The phase margin (Phase Margin) and bandwidth, which increase the stability of the switched capacitor regulator, thereby improving the performance of the switched capacitor regulator.
In summary, the switched capacitor regulator of the present invention comprises a switched capacitor circuit, a sensing component, a feedback circuit and a control circuit, the switched capacitor circuit generates an output voltage according to an input voltage, and the sensing component senses a switched capacitor. The voltage of the circuit generates a feedback voltage, and the feedback circuit generates a feedback signal according to the feedback voltage generated by the sensing component, and the switched capacitor circuit adjusts the output voltage according to the feedback signal, and the control circuit is coupled to the sensing component and Between the feedback circuits, and when the input voltage is charged to switch the capacitor circuit, the feedback circuit is turned off according to the feedback voltage to provide a good, stable, non-jittering output voltage to improve the switching capacitor. The performance of the regulator.
Therefore, the present invention is a novelty, progressive and available for industrial use. It should be in accordance with the patent application requirements of the patent law of China. Undoubtedly, the invention patent application is filed according to law, and the prayer bureau will grant the patent as soon as possible.
However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that the shapes, structures, features, and spirits described in the claims of the present invention are equally changed. Modifications are intended to be included in the scope of the patent application of the present invention.
10‧‧‧切換式電容電路10‧‧‧Switching capacitor circuit
11‧‧‧第一開關11‧‧‧First switch
13‧‧‧第二開關13‧‧‧Second switch
20‧‧‧控制電路20‧‧‧Control circuit
22‧‧‧第一開關22‧‧‧First switch
24‧‧‧第二開關24‧‧‧second switch
30‧‧‧回授電路30‧‧‧Return circuit
32‧‧‧反相器32‧‧‧Inverter
34‧‧‧差動放大器34‧‧‧Differential Amplifier
CK‧‧‧控制訊號CK‧‧‧ control signal
CKB‧‧‧反相控制訊號CK B ‧‧‧Inverted Control Signal
CFL‧‧‧第一電容C FL ‧‧‧first capacitor
CL‧‧‧第二電容C L ‧‧‧second capacitor
ILOAD‧‧‧電流源I LOAD ‧‧‧current source
RFB‧‧‧感測元件R FB ‧‧‧Sensor components
36‧‧‧可調整阻抗元件36‧‧‧Adjustable impedance components
VCC‧‧‧供應電壓V CC ‧‧‧ supply voltage
VFB‧‧‧回授電壓V FB ‧‧‧Responsive voltage
VIN‧‧‧輸入電壓V IN ‧‧‧ input voltage
VOUT‧‧‧輸出電壓V OUT ‧‧‧ output voltage
VREF1‧‧‧第一參考電壓V REF1 ‧‧‧First reference voltage
VREF2‧‧‧第二參考電壓V REF2 ‧‧‧second reference voltage
第一圖係本發明之一較佳實施例之切換式電容穩壓器的電路圖；以及
第二圖係本發明之另一較佳實施例之切換式電容穩壓器的電路圖。
1 is a circuit diagram of a switched capacitor regulator in accordance with a preferred embodiment of the present invention; and a second diagram is a circuit diagram of a switched capacitor regulator in accordance with another preferred embodiment of the present invention.
10‧‧‧切換式電容電路 10‧‧‧Switching capacitor circuit
11‧‧‧第一開關 11‧‧‧First switch
13‧‧‧第二開關 13‧‧‧Second switch
20‧‧‧控制電路 20‧‧‧Control circuit
22‧‧‧第一開關 22‧‧‧First switch
24‧‧‧第二開關 24‧‧‧second switch
30‧‧‧回授電路 30‧‧‧Return circuit
32‧‧‧反相器 32‧‧‧Inverter
34‧‧‧差動放大器 34‧‧‧Differential Amplifier
36‧‧‧可調整阻抗元件 36‧‧‧Adjustable impedance components
CK‧‧‧控制訊號 CK‧‧‧ control signal
CKB‧‧‧反相控制訊號 CK B ‧‧‧Inverted Control Signal
CFL‧‧‧第一電容 C FL ‧‧‧first capacitor
CL‧‧‧第二電容 C L ‧‧‧second capacitor
ILOAD‧‧‧電流源 I LOAD ‧‧‧current source
RFB‧‧‧感測元件 R FB ‧‧‧Sensor components
VCC‧‧‧供應電壓 V CC ‧‧‧ supply voltage
VFB‧‧‧回授電壓 V FB ‧‧‧Responsive voltage
VIN‧‧‧輸入電壓 V IN ‧‧‧ input voltage
VOUT‧‧‧輸出電壓 V OUT ‧‧‧ output voltage
VREF1‧‧‧第一參考電壓 V REF1 ‧‧‧First reference voltage
VREF2‧‧‧第二參考電壓 V REF2 ‧‧‧second reference voltage
Claims (15)
一切換式電容電路，依據一輸入電壓產生一輸出電壓；
一感測元件，感測該切換式電容電路之一電壓產生一回授電壓；
一回授電路，依據該回授電壓產生一回授訊號，以控制該切換式電容電路，而調整該輸出電壓；以及
一控制電路，耦接於該感測元件與該回授電路之間，該控制電路於該輸入電壓充電該切換式電容電路時，截止傳輸該回授電壓至該回授電路，而截止該回授電路依據該回授電壓調整該輸出電壓。A switched capacitor regulator comprising:
a switching capacitor circuit for generating an output voltage according to an input voltage;
a sensing component sensing a voltage of the switched capacitor circuit to generate a feedback voltage;
a feedback circuit, a feedback signal is generated according to the feedback voltage to control the switched capacitor circuit, and the output voltage is adjusted; and a control circuit is coupled between the sensing component and the feedback circuit, The control circuit turns off the feedback voltage to the feedback circuit when the input voltage is charged to the switching capacitor circuit, and the feedback circuit adjusts the output voltage according to the feedback voltage.
一第一開關，耦接於該感測元件與該回授電路之間，並傳送該回授電壓至該回授電路，該輸入電壓充電該切換式電容電路時，該第一開關截止；以及
一第二開關，耦接於一參考電壓與該回授電路之間，該輸入電壓充電該切換式電容電路時，該第二開關導通以傳送該參考電壓至該回授電路，該回授電路依據該參考電壓產生該回授訊號，以控制該切換式電容電路。The switching capacitor regulator according to claim 1, wherein the control circuit further comprises:
a first switch coupled between the sensing component and the feedback circuit, and transmitting the feedback voltage to the feedback circuit, wherein the first switch is turned off when the input voltage charges the switched capacitor circuit; a second switch coupled between a reference voltage and the feedback circuit, wherein when the input voltage charges the switched capacitor circuit, the second switch is turned on to transmit the reference voltage to the feedback circuit, the feedback circuit The feedback signal is generated according to the reference voltage to control the switched capacitor circuit.
一第一開關，具有一第一端與一第二端，該第一端接收該輸入電壓；
一第一電容，耦接於該第一開關之該第二端，該輸入電壓經該第一開關對該第一電容充電；
一第二開關，具有一第一端與一第二端，該第二開關之該第一端耦接於該第一電容；以及
一第二電容，耦接於該第二開關之該第二端，該第一電容之一電壓經該第二開關對該第二電容充電，以產生該輸出電壓。The switching capacitor regulator according to claim 1, wherein the switching capacitor circuit further comprises:
a first switch having a first end and a second end, the first end receiving the input voltage;
a first capacitor coupled to the second end of the first switch, the input voltage charging the first capacitor via the first switch;
a second switch having a first end and a second end, the first end of the second switch being coupled to the first capacitor, and a second capacitor coupled to the second end of the second switch End, the voltage of one of the first capacitors charges the second capacitor via the second switch to generate the output voltage.
一反相器，其一輸入端接收一輸入訊號，且一輸出端耦接該切換式電容電路，並依據該輸入訊號產生一輸出訊號，以控制該切換式電容電路；
一可調整阻抗元件，具有一第一端與一第二端，該第一端耦接於一供應電壓，該第二端耦接於該反相器，以調整該反相器之該輸出訊號；以及
一差動放大器，依據該回授電壓與一參考電壓產生該回授訊號，以調整該可調整阻抗元件之阻抗，而調整該反相器之該輸出訊號。The switching capacitor regulator according to claim 1, wherein the feedback circuit further comprises:
An inverter, an input terminal receives an input signal, and an output terminal is coupled to the switched capacitor circuit, and generates an output signal according to the input signal to control the switched capacitor circuit;
An adjustable impedance component has a first end and a second end, the first end is coupled to a supply voltage, and the second end is coupled to the inverter to adjust the output signal of the inverter And a differential amplifier that generates the feedback signal according to the feedback voltage and a reference voltage to adjust the impedance of the adjustable impedance component to adjust the output signal of the inverter.
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| TW99123050A TWI420275B (en) | 2010-07-13 | 2010-07-13 | Switching capacitor voltage regulator |
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|---|---|---|---|
| TW99123050A TWI420275B (en) | 2010-07-13 | 2010-07-13 | Switching capacitor voltage regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI662390B (en) * | 2018-03-01 | 2019-06-11 | 新唐科技股份有限公司 | Digital control system for voltage regulation and method thereof |
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| TWI508420B (en) | 2013-03-15 | 2015-11-11 | Silicon Motion Inc | Switching-capacitor regulator with charge injection mode for high loading current |
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| US20080212347A1 (en) * | 2005-01-24 | 2008-09-04 | The Hong Kong University Of Science And Technology | Switched-capacitor regulators |
| TW200937155A (en) * | 2008-02-22 | 2009-09-01 | Anwell Semiconductor Corp | Control circuit architecture for dynamically adjusting switching frequency of constant voltage regulator |
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| US6501253B2 (en) * | 2000-04-12 | 2002-12-31 | Stmicroelectronics S.A. | Low electrical consumption voltage regulator |
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| US20080212347A1 (en) * | 2005-01-24 | 2008-09-04 | The Hong Kong University Of Science And Technology | Switched-capacitor regulators |
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| TW200937155A (en) * | 2008-02-22 | 2009-09-01 | Anwell Semiconductor Corp | Control circuit architecture for dynamically adjusting switching frequency of constant voltage regulator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI662390B (en) * | 2018-03-01 | 2019-06-11 | 新唐科技股份有限公司 | Digital control system for voltage regulation and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201202884A (en) | 2012-01-16 |
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