TWI553437B - Cable drop compensation circuit and power circuit using the same - Google Patents
Cable drop compensation circuit and power circuit using the same Download PDFInfo
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本發明係關於一種線損補償電路及具線損補償的直流輸出電。 The invention relates to a line loss compensation circuit and a DC output power with line loss compensation.
一般而言，電源供應器輸出至負載的電壓會因為連接電源供應器及負載之間的電源線的線阻而有壓降在電源線上。而壓降的大小與負載的電流成正比。當壓降過大時，會使負載所接收的負載電壓低於負載正常運作的所容許的電壓範圍，因而造成負載無法正常運作的問題 In general, the voltage output from the power supply to the load will drop on the power line due to the line resistance of the power line connecting the power supply and the load. The magnitude of the voltage drop is proportional to the current of the load. When the voltage drop is too large, the load voltage received by the load will be lower than the allowable voltage range of the normal operation of the load, thus causing the load to fail to operate normally.
為了補償電源線的壓降，傳統的電源供應器根據負載電流進行補償，使負載所接收的負載電壓穩定在預定的負載電壓上。請參見圖1，為美國專利公開號US20130027987所揭露的具有線損補償的電源轉換電路。電源轉換電路包含一變壓器10、功率電晶體20及75、一脈寬控制器30、一光耦合器60、一同步整流控制器70以及一穩壓電路100，用以將一輸入電壓Vin轉換成一輸出電壓Vo。功率電晶 體20耦接變壓器10的一初次側線圈Np及接地，用以切換變壓器10。脈寬控制器30根據一迴授訊號VFB產生一切換訊號Spwm切換功率電晶體20，以調整輸出電壓Vo。一輸出電容45耦接變壓器10的一次級側線圈Ns，以穩壓輸出電壓Vo。光耦合器60透過一電阻62耦接次級側線圈Ns，並根據輸出電壓Vo產生迴授訊號VFB至脈寬控制器30。變壓器10的次級側線圈Ns透過一電源線耦接至負載以提供輸出電壓Vo，而一負載電流Io流經電源線。 In order to compensate for the voltage drop of the power line, the conventional power supply compensates according to the load current, so that the load voltage received by the load is stabilized at a predetermined load voltage. Referring to Fig. 1, a power conversion circuit with line loss compensation disclosed in U.S. Patent Publication No. US20130027987. The power conversion circuit includes a transformer 10, power transistors 20 and 75, a pulse width controller 30, an optocoupler 60, a synchronous rectification controller 70, and a voltage stabilizing circuit 100 for converting an input voltage Vin into a Output voltage Vo. Power cell The body 20 is coupled to a primary side coil Np of the transformer 10 and a ground for switching the transformer 10. The pulse width controller 30 generates a switching signal Spwm to switch the power transistor 20 according to a feedback signal VFB to adjust the output voltage Vo. An output capacitor 45 is coupled to the primary-stage side coil Ns of the transformer 10 to regulate the output voltage Vo. The photocoupler 60 is coupled to the secondary side coil Ns through a resistor 62, and generates a feedback signal VFB to the pulse width controller 30 according to the output voltage Vo. The secondary side coil Ns of the transformer 10 is coupled to the load through a power supply line to provide an output voltage Vo, and a load current Io flows through the power supply line.
電源轉換電路具有一同步整流電路，以改善電源轉換電路的轉換效率。同步整流電路包含同步整流控制器70以及功率電晶體75，而功率電晶體75具有一寄生二極體76。功率電晶體75用來取代傳統的二極體來進行整流，其中，汲極耦接次級側線圈Ns，而寄生二極體76耦接於汲極及源極之間。同步整流控制器70產生一同步整流訊號Ssr至功率電晶體75的閘極，以截止/導通功率電晶體75。 The power conversion circuit has a synchronous rectification circuit to improve the conversion efficiency of the power conversion circuit. The synchronous rectification circuit includes a synchronous rectification controller 70 and a power transistor 75, and the power transistor 75 has a parasitic diode 76. The power transistor 75 is used to replace the conventional diode for rectification, wherein the drain is coupled to the secondary side coil Ns, and the parasitic diode 76 is coupled between the drain and the source. The synchronous rectification controller 70 generates a synchronous rectification signal Ssr to the gate of the power transistor 75 to turn off/on the power transistor 75.
穩壓電路100接收同步整流訊號Ssr及一分壓訊號VA以產生一訊號VF至光耦合器60。分壓訊號VA由電阻51及52所組成的分壓器根據輸出電壓Vo所產生。因此，迴授訊號VFB係根據輸出電壓Vo所產生。再者，一電阻115耦接穩壓電路100的一端點Rp。同步整流訊號Ssr與輸出電流Io有關，而電阻115用以程式化補償量。藉此，輸出電壓Vo的壓降根據同步整流訊號Ssr及電阻115，可以補償掉電源線的壓降。 The voltage stabilizing circuit 100 receives the synchronous rectification signal Ssr and a voltage division signal VA to generate a signal VF to the optical coupler 60. The voltage dividing signal VA is formed by a voltage divider composed of resistors 51 and 52 according to the output voltage Vo. Therefore, the feedback signal VFB is generated based on the output voltage Vo. Furthermore, a resistor 115 is coupled to an end point Rp of the voltage stabilizing circuit 100. The synchronous rectification signal Ssr is related to the output current Io, and the resistor 115 is used to program the compensation amount. Thereby, the voltage drop of the output voltage Vo can compensate for the voltage drop of the power line according to the synchronous rectification signal Ssr and the resistor 115.
然而，這樣的電路架構不僅穩壓電路100的電路設計複雜，而且對於多個負載而有不同的電源線壓降也並未提出解決的對策。 However, such a circuit architecture not only has complicated circuit design of the voltage stabilizing circuit 100, but also has different power line voltage drops for a plurality of loads.
鑑於先前技術中的電路設計複雜及未提出多負載之線損補償之解決方案，本發明則僅在負載電流大於預定值後，才進行線損補償，不僅電路相對簡單，而且應用於多負載之情況，可以達到可接收的線損補償效果。 In view of the complicated circuit design in the prior art and the solution of the line loss compensation without multiple loads, the present invention performs line loss compensation only after the load current is greater than a predetermined value, and the circuit is relatively simple, and is applied to multiple loads. In this case, the acceptable line loss compensation effect can be achieved.
為達上述目的，本發明提供了一種線損補償電路，包含一電流偵測電路、一補償判斷電路以及一補償電路。電流偵測電路偵測一直流輸出電路提供至一負載之一負載電流，並據此產生一電流偵測訊號。補償判斷電路接收電流偵測訊號並判斷負載電流大於一預定補償值時，產生一判斷訊號。補償電路於接收判斷訊號時，產生一補償訊號。直流輸出電路對應補償訊號，提高所輸出的一輸出電壓一電壓補償值。 To achieve the above object, the present invention provides a line loss compensation circuit including a current detecting circuit, a compensation determining circuit and a compensation circuit. The current detecting circuit detects that the DC output circuit supplies a load current to a load, and generates a current detecting signal accordingly. When the compensation judgment circuit receives the current detection signal and determines that the load current is greater than a predetermined compensation value, a determination signal is generated. The compensation circuit generates a compensation signal when receiving the determination signal. The DC output circuit corresponds to the compensation signal, and increases an output voltage-voltage compensation value of the output.
本發明也提供了一種具線損補償的電源電路，包含一直流輸出電路及至少二線損補償電路。直流輸出電路係用以提供一輸出電壓，根據代表一迴授訊號調整輸出電壓。至少二線損補償電路分別耦接直流輸出電路及對應的一負載之間。每一線損補償電路包含一電流偵測電路、一補償判斷電路以及一補償電路。電流偵測電路偵測對應負載之一負載電流，並據此產生一電流偵測訊號。補償判斷電路接收電流偵測訊號，並判斷負載電流 大於一預定補償值時，產生一判斷訊號。補償電路，於接收判斷訊號時產生一補償訊號。直流輸出電路對應這些補償訊號之至少其中之一提高輸出電壓一電壓補償值。 The invention also provides a power supply circuit with line loss compensation, comprising a DC output circuit and at least a two-line loss compensation circuit. The DC output circuit is used to provide an output voltage, and the output voltage is adjusted according to a feedback signal. The at least two line loss compensation circuits are respectively coupled between the DC output circuit and a corresponding one of the loads. Each line loss compensation circuit includes a current detection circuit, a compensation determination circuit, and a compensation circuit. The current detecting circuit detects one of the load currents of the corresponding load and generates a current detecting signal accordingly. The compensation judgment circuit receives the current detection signal and determines the load current When it is greater than a predetermined compensation value, a determination signal is generated. The compensation circuit generates a compensation signal when receiving the determination signal. The DC output circuit increases the output voltage-voltage compensation value corresponding to at least one of the compensation signals.
再者，本發明的線損補償電路及具線損補償的直流輸出電路也可以額外增加保護電路，於應用環境超過預設的操作範圍時，進行保護以避免任何電路毀損之可能。 Furthermore, the line loss compensation circuit of the present invention and the DC output circuit with line loss compensation can additionally add a protection circuit to protect against any damage of the circuit when the application environment exceeds a preset operating range.
以上的概述與接下來的詳細說明皆為示範性質，是為了進一步說明本發明的申請專利範圍。而有關本發明的其他目的與優點，將在後續的說明與圖示加以闡述。 The above summary and the following detailed description are exemplary in order to further illustrate the scope of the claims. Other objects and advantages of the present invention will be described in the following description and drawings.
先前技術： Prior art:
10‧‧‧變壓器 10‧‧‧Transformers
20、75‧‧‧功率電晶體 20, 75‧‧‧ power transistors
30‧‧‧脈寬控制器 30‧‧‧ Pulse Width Controller
51、52‧‧‧電阻 51, 52‧‧‧ resistance
60‧‧‧光耦合器 60‧‧‧Optocoupler
62‧‧‧電阻 62‧‧‧resistance
70‧‧‧同步整流控制器 70‧‧‧Synchronous Rectifier Controller
76‧‧‧寄生二極體 76‧‧‧ Parasitic diode
100‧‧‧穩壓電路 100‧‧‧Variable circuit
115‧‧‧電阻 115‧‧‧resistance
Io‧‧‧負載電流 Io‧‧‧Load current
Np‧‧‧初次側線圈 Np‧‧‧First side coil
Ns‧‧‧次級側線圈 Ns‧‧‧ secondary side coil
Rp‧‧‧端點 Rp‧‧‧ endpoint
Spwm‧‧‧切換訊號 Spwm‧‧‧Switch signal
Ssr‧‧‧同步整流訊號 Ssr‧‧‧Synchronous Rectifier Signal
VA‧‧‧分壓訊號 VA‧‧‧ partial pressure signal
VF‧‧‧訊號 VF‧‧‧ signal
VFB‧‧‧迴授訊號 VFB‧‧‧ feedback signal
Vin‧‧‧輸入電壓 Vin‧‧‧Input voltage
Vo‧‧‧輸出電壓 Vo‧‧‧ output voltage
本發明： this invention:
200、300‧‧‧線損補償電路 200, 300‧‧‧Line loss compensation circuit
210、310‧‧‧驅動電路 210, 310‧‧‧ drive circuit
220、320‧‧‧閉鎖電路 220, 320‧‧‧ latching circuit
225、325‧‧‧比較器 225, 325‧‧‧ comparator
230‧‧‧開關 230‧‧‧ switch
235、335、345‧‧‧放大器 235, 335, 345‧ ‧ amplifier
240‧‧‧開關 240‧‧‧ switch
245‧‧‧比較器 245‧‧‧ Comparator
250‧‧‧直流輸出電路 250‧‧‧DC output circuit
315‧‧‧誤差放大器 315‧‧‧Error amplifier
330、336‧‧‧電晶體 330, 336‧‧‧Optoelectronics
340‧‧‧電流偵測電路 340‧‧‧ Current detection circuit
Co、Co1、Co2、Co3‧‧‧輸出電容 Co, Co1, Co2, Co3‧‧‧ output capacitor
D‧‧‧二極體 D‧‧‧ diode
FB‧‧‧迴授端 FB‧‧‧reporting end
I、I1、I2‧‧‧電流源 I, I1, I2‧‧‧ current source
IL‧‧‧負載電流 IL‧‧‧load current
R1、R2、R1’、R2’‧‧‧電阻 R1, R2, R1', R2'‧‧‧ resistance
Rc、Rc1、Rc2、Rc3、Rco‧‧‧補償電阻 Rc, Rc1, Rc2, Rc3, Rco‧‧‧ compensation resistors
Rcs、Rcs1、Rcs2、Rcs3‧‧‧補償參考電阻 Rcs, Rcs1, Rcs2, Rcs3‧‧‧ compensation reference resistor
Rcd‧‧‧電流偵測電阻 Rcd‧‧‧ current detecting resistor
RL、RL1、RL2、RL3、RL3‧‧‧負載 RL, RL1, RL2, RL3, RL3‧‧‧ load
Sc‧‧‧電流偵測訊號 Sc‧‧‧ current detection signal
Sj‧‧‧判斷訊號 Sj‧‧‧judging signal
Sp‧‧‧保護訊號 Sp‧‧‧protection signal
Vo‧‧‧輸出電壓 Vo‧‧‧ output voltage
Vo’‧‧‧補償輸出電壓 Vo’‧‧‧Compensated output voltage
Vout‧‧‧輸出端 Vout‧‧‧ output
Vrcs‧‧‧補償參考電壓 Vrcs‧‧‧compensated reference voltage
Vroc、Roc1、Roc2、Roc3‧‧‧過流參考電壓 Vroc, Roc1, Roc2, Roc3‧‧‧ overcurrent reference voltage
圖1為美國專利公開號US20130027987所揭露的具有線損補償的電源轉換電路。 Figure 1 is a power conversion circuit with line loss compensation as disclosed in U.S. Patent Publication No. US20130027987.
圖2為根據本發明之一第一較佳實施例之線損補償電路之電路示意圖。 2 is a circuit diagram of a line loss compensation circuit in accordance with a first preferred embodiment of the present invention.
圖3為應用本發明之一第二較佳實施例之線損補償電路的直流輸出電路之電路示意圖。 3 is a circuit diagram of a DC output circuit to which a line loss compensation circuit according to a second preferred embodiment of the present invention is applied.
圖4為應用本發明之線損補償電路的另一電源電路之電路示意圖。 4 is a circuit diagram of another power supply circuit to which the line loss compensation circuit of the present invention is applied.
圖5為應用本發明之線損補償電路的再一電源電路之電路示意圖。 Fig. 5 is a circuit diagram showing still another power supply circuit to which the line loss compensation circuit of the present invention is applied.
圖6為根據本發明之一第三較佳實施例之線損補償電路之 電路示意圖。 6 is a line loss compensation circuit according to a third preferred embodiment of the present invention; Circuit diagram.
圖2為根據本發明之一第一較佳實施例之線損補償電路之電路示意圖。線損補償電路耦接於一直流輸出電路250及一負載RL之間，而線損補償電路與負載RL之間透過一電源線連接。直流輸出電路250於一輸出端Vout提供一-輸出電壓Vo。一輸出電容Co耦接輸出端Vout，以對輸出電壓Vo進行穩壓。電阻R1和R2串聯於輸出端Vout及共同電位(接地電位)之間，其串聯接點耦接一迴授端FB，以提供代表輸出電壓Vo的一迴授訊號。直流輸出電路250根據迴授訊號穩定輸出電壓Vo。 2 is a circuit diagram of a line loss compensation circuit in accordance with a first preferred embodiment of the present invention. The line loss compensation circuit is coupled between the DC output circuit 250 and a load RL, and the line loss compensation circuit is connected to the load RL through a power line. The DC output circuit 250 provides an output voltage Vo at an output terminal Vout. An output capacitor Co is coupled to the output terminal Vout to regulate the output voltage Vo. The resistors R1 and R2 are connected in series between the output terminal Vout and the common potential (ground potential), and the series contacts are coupled to a feedback terminal FB to provide a feedback signal representative of the output voltage Vo. The DC output circuit 250 stabilizes the output voltage Vo according to the feedback signal.
線損補償電路包含一電流偵測電路、一補償判斷電路以及一補償電路。電流偵測電路包含一放大器235，根據一電流偵測電阻Rcd的兩端電壓差產生一電流偵測訊號Sc。由於電流偵測電阻Rcd的兩端電壓差也正比於流經其上的電流，也就是直流輸出電路250所提供至負載RL之一負載電流IL。因此，電流偵測訊號Sc可代表負載電流IL。補償判斷電路包含一比較器245。比較器245的一非反相端接收電流偵測訊號Sc，一反相端接收一補償參考電壓Vrcs。當電流偵測訊號Sc大於補償參考電壓Vrcs時，也就是負載電流IL大於一預定補償值時，比較器245輸出一判斷訊號Sj。補償電路包含串聯的一開關240以及一補償電阻Rc。補償電阻Rc耦接至電阻R1及 R2的串聯點。當負載電流IL小於預定補償值時，開關240為截止。此時，線損補償電路未進行補償，直流輸出電路250的輸出電壓Vo穩定於預定輸出電壓值。然而，當負載電流IL大於預定補償值時，補償判斷電路輸出判斷訊號Sj以導通開關240。當開關240為截止時，電阻R1和R2的分壓比為r2/(r1+r2)，其中r1和r2為電阻R1和R2的阻值。此時迴授訊號與輸出電壓Vo的比例即為r2/(r1+r2)。當開關240為導通時，因補償電阻Rc與電阻R2並聯，故迴授訊號與輸出電壓Vo的比例降低至r/(r1+r)，而r=r2*rc/(r2+rc)，其中rc為電阻Rc的阻值。 直流輸出電路250將會調整輸出電壓Vo，使迴授訊號回升至與補償前的相同。因為阻值r1、r2及rc為固定值，故輸出電壓所提高的電壓補償值為輸出電壓的一固定比例值。在輸出電壓被穩定於一預定輸出電壓值之情況下，電壓補償值即為一定值。 The line loss compensation circuit comprises a current detecting circuit, a compensation determining circuit and a compensation circuit. The current detecting circuit includes an amplifier 235 for generating a current detecting signal Sc according to a voltage difference between the two ends of the current detecting resistor Rcd. Since the voltage difference across the current detecting resistor Rcd is also proportional to the current flowing therethrough, that is, the load current IL supplied from the DC output circuit 250 to the load RL. Therefore, the current detection signal Sc can represent the load current IL. The compensation decision circuit includes a comparator 245. A non-inverting terminal of the comparator 245 receives the current detecting signal Sc, and an inverting terminal receives a compensation reference voltage Vrcs. When the current detection signal Sc is greater than the compensation reference voltage Vrcs, that is, when the load current IL is greater than a predetermined compensation value, the comparator 245 outputs a determination signal Sj. The compensation circuit includes a switch 240 connected in series and a compensation resistor Rc. The compensation resistor Rc is coupled to the resistor R1 and The tandem point of R2. When the load current IL is less than the predetermined compensation value, the switch 240 is off. At this time, the line loss compensation circuit is not compensated, and the output voltage Vo of the DC output circuit 250 is stabilized at a predetermined output voltage value. However, when the load current IL is greater than the predetermined compensation value, the compensation determination circuit outputs the determination signal Sj to turn on the switch 240. When the switch 240 is off, the voltage dividing ratio of the resistors R1 and R2 is r2 / (r1 + r2), where r1 and r2 are the resistance values of the resistors R1 and R2. At this time, the ratio of the feedback signal to the output voltage Vo is r2/(r1+r2). When the switch 240 is turned on, since the compensation resistor Rc is connected in parallel with the resistor R2, the ratio of the feedback signal to the output voltage Vo is reduced to r/(r1+r), and r=r2*rc/(r2+rc), wherein Rc is the resistance of the resistor Rc. The DC output circuit 250 will adjust the output voltage Vo to cause the feedback signal to rise back to the same level as before the compensation. Since the resistance values r1, r2, and rc are fixed values, the voltage compensation value that the output voltage is increased is a fixed ratio of the output voltage. In the case where the output voltage is stabilized at a predetermined output voltage value, the voltage compensation value is a certain value.
舉例來說，直流輸出電路為萬用串列匯流排(Universal Serial Bus，以下簡稱USB)電壓源，且輸出電壓的規範為5V±0.25V，以及額定輸出電流為1A。本發明的線損補償電路可以根據其規範設置預定補償值及電壓補償值。 例如：預定補償值設為額定輸出電流的1A而電壓補償值設為輸出電壓的最大容許偏移值的0.25V。因此，當負載電流1A時，原則上，負載上所接收的電壓可能低於4.75V。若是，則線損補償電路啟動補償，而使輸出電壓回升至5V以確保負載 電壓可以維持在規範之內。當然，根據應用電路的規範設置預定補償值及電壓補償值，能確保電路操作在規範之內，但其設定值不必須是規範所容許的最大偏移值或額定值。例如，在上述的例子中，預定補償值及電壓補償值可設定為，例如：0.5A及0.25V、1A及0.125V或0.5A及0.125V等。 For example, the DC output circuit is a universal serial bus (USB) voltage source, and the output voltage is specified as 5V±0.25V, and the rated output current is 1A. The line loss compensation circuit of the present invention can set a predetermined compensation value and a voltage compensation value according to its specification. For example, the predetermined compensation value is set to 1A of the rated output current and the voltage compensation value is set to 0.25V of the maximum allowable offset value of the output voltage. Therefore, when the load current is 1A, in principle, the voltage received on the load may be lower than 4.75V. If so, the line loss compensation circuit starts compensation, and the output voltage rises back to 5V to ensure the load. The voltage can be maintained within specifications. Of course, setting the predetermined compensation value and voltage compensation value according to the specification of the application circuit can ensure that the circuit operation is within the specification, but the set value does not have to be the maximum offset value or rated value allowed by the specification. For example, in the above example, the predetermined compensation value and the voltage compensation value may be set to, for example, 0.5A and 0.25V, 1A and 0.125V or 0.5A and 0.125V, and the like.
如上述，本發明的線損補償電路於負載電流超過預定補償值時，才進行線損補償，因此電路的設計相當簡單，而且也可確保系統操作於規範之內。而且電流偵測電路、補償判斷電路及補償電路可以被封裝於單一封裝體，使線損補償電路成為單一積體電路。電阻Rc可以為外接的設定元件，透過封裝體之一腳位耦接補償判斷電路。藉此，使用者可以調整電阻Rc來達到調整電壓補償值的大小，使線損補償電路的應用更有彈性。 As described above, the line loss compensating circuit of the present invention performs line loss compensation when the load current exceeds a predetermined compensation value, so that the circuit design is relatively simple, and the system operation is also ensured. Moreover, the current detecting circuit, the compensation judging circuit and the compensating circuit can be packaged in a single package, so that the line loss compensating circuit becomes a single integrated circuit. The resistor Rc can be an external setting component, and is coupled to the compensation judging circuit through one of the pins of the package. Thereby, the user can adjust the resistance Rc to adjust the magnitude of the voltage compensation value, so that the application of the line loss compensation circuit is more flexible.
本發明之線損補償電路可以額外包含一保護電路，以更進一步地提供保護之功能。請再參見圖2，保護電路主要包含一開關230及一過流判斷電路。開關230耦接於直流輸出電路250及負載RL之間。過流判斷電路於負載電流IL高於一過流保護值時，截止開關230以停止供應負載電流IL提供至負載RL。在本實施例，過流判斷電路包含一比較器225以及一驅動電路210。比較器225之一非反相端接收電流偵測訊號Sc，一反相端接收一過流參考電壓Vroc。當電流偵測訊號Sc高於過流參考電壓Vroc時，也就是，負載電流IL大於一 過流保護值時，比較器225輸出一保護訊號Sp至驅動電路210，使驅動電路210截止開關230以停止負載電流IL提供至負載RL。其中，過流保護值大於預定補償值，一般而言大於或等於額定輸出電流。 The line loss compensation circuit of the present invention may additionally include a protection circuit to further provide a protection function. Referring again to FIG. 2, the protection circuit mainly includes a switch 230 and an overcurrent determination circuit. The switch 230 is coupled between the DC output circuit 250 and the load RL. The overcurrent judging circuit supplies the off load switch IL to the load RL to stop supplying the load current IL when the load current IL is higher than an overcurrent protection value. In this embodiment, the overcurrent determination circuit includes a comparator 225 and a drive circuit 210. One non-inverting terminal of the comparator 225 receives the current detecting signal Sc, and an inverting terminal receives an overcurrent reference voltage Vroc. When the current detection signal Sc is higher than the overcurrent reference voltage Vroc, that is, the load current IL is greater than one When the overcurrent protection value is exceeded, the comparator 225 outputs a protection signal Sp to the driving circuit 210, causing the driving circuit 210 to turn off the switch 230 to stop the supply of the load current IL to the load RL. Wherein, the overcurrent protection value is greater than a predetermined compensation value, and is generally greater than or equal to the rated output current.
當然，保護電路也可以同時被封裝在單一封裝體之內，使得本發明的線損補償電路達到積體電路化。 Of course, the protection circuit can also be packaged in a single package at the same time, so that the line loss compensation circuit of the present invention reaches the integrated circuit.
圖3為應用本發明之一第二較佳實施例之線損補償電路的電源電路之電路示意圖。具線損補償的電源電路，包含一直流輸出電路250及至少二線損補償電路200。在本實施例以兩個線損補償電路200為例來說明。直流輸出電路係用以於一輸出端Vout提供一輸出電壓Vo，於一迴授端FB接收代表一迴授訊號，並據此調整輸出電壓Vo。每一線損補償電路200均為一積體電路，之分別耦接直流輸出電路250及負載RL1及RL2中對應的一負載之間。每一線損補償電路200包含一電流偵測電路、一補償判斷電路以及一補償電路。電流偵測電路偵測對應負載之一負載電流，並據此產生一電流偵測訊號。補償判斷電路接收電流偵測訊號，並判斷負載電流大於一預定補償值時，產生一判斷訊號。補償電路於接收判斷訊號時產生一補償訊號。直流輸出電路250對應這些補償訊號提高輸出電壓Vo一電壓補償值。線損補償電路200可以是圖2所示的線損補償電路。而在本實施例，線損補償電路200相較於圖2所示的線損補償電路有部分的差異。以下僅就差異部 分說明。 3 is a circuit diagram of a power supply circuit to which a line loss compensation circuit according to a second preferred embodiment of the present invention is applied. The power line circuit with line loss compensation includes a DC output circuit 250 and at least a two line loss compensation circuit 200. In the present embodiment, two line loss compensation circuits 200 are taken as an example for explanation. The DC output circuit is configured to provide an output voltage Vo at an output terminal Vout, receive a feedback signal at a feedback terminal FB, and adjust the output voltage Vo accordingly. Each line loss compensation circuit 200 is an integrated circuit coupled between the DC output circuit 250 and a corresponding one of the loads RL1 and RL2. Each line loss compensation circuit 200 includes a current detection circuit, a compensation determination circuit, and a compensation circuit. The current detecting circuit detects one of the load currents of the corresponding load and generates a current detecting signal accordingly. The compensation determining circuit receives the current detecting signal and determines that the load current is greater than a predetermined compensation value to generate a determining signal. The compensation circuit generates a compensation signal when receiving the determination signal. The DC output circuit 250 increases the output voltage Vo to a voltage compensation value corresponding to the compensation signals. The line loss compensation circuit 200 may be the line loss compensation circuit shown in FIG. 2. In the present embodiment, the line loss compensation circuit 200 is partially different from the line loss compensation circuit shown in FIG. The following is only the difference Divided into instructions.
電流偵測電路的放大器235偵測保護電路中的開關230的兩端，藉由開關230的一等效阻抗作為電流偵測電阻以偵測流經其上的負載電流。因此，可以省略圖2的電流偵測電阻Rcd。 The amplifier 235 of the current detecting circuit detects both ends of the switch 230 in the protection circuit, and uses an equivalent impedance of the switch 230 as a current detecting resistor to detect a load current flowing therethrough. Therefore, the current detecting resistor Rcd of FIG. 2 can be omitted.
補償參考電壓由一電流源I1流經一補償參考電阻所產生，並提供至補償判斷電路的比較器245的反相端。補償參考電阻可以是一外接電阻，透過線損補償電路200的一腳位耦接至補償判斷電路。線損補償電路200的補償參考電阻可以相同或不相同，如本實施例的線損補償電路200分別耦接補償參考電阻Rcs1及Rcs2，以對應不同的應用環境或負載做較佳的電路設置。 The compensation reference voltage is generated by a current source I1 flowing through a compensation reference resistor and provided to the inverting terminal of the comparator 245 of the compensation judging circuit. The compensation reference resistor may be an external resistor coupled to the compensation determination circuit through a pin of the line loss compensation circuit 200. The compensation reference resistance of the line loss compensation circuit 200 may be the same or different. For example, the line loss compensation circuit 200 of the embodiment is coupled to the compensation reference resistors Rcs1 and Rcs2 to perform better circuit settings corresponding to different application environments or loads.
過流參考電壓Vroc由一電流源I2流經一過流參考電阻所產生，並提供至保護電路的比較器225的反相端。補償參考電阻可以是一外接電阻，透過線損補償電路200的一腳位耦接至保護電路。線損補償電路200的過流參考電阻可以相同或不相同，如本實施例的線損補償電路200分別耦接過流參考電阻Roc1及Roc2，以對應不同的應用環境或負載做較佳的電路設置。保護電路可以額外增加一閉鎖電路220，耦接比較器225。當發生過流時，閉鎖電路220則進行閉鎖保護，使得驅動電路210持續截止開關230，直至電路重啟為止。在過流的原因無法單純以暫停輸出負載電流而解除情況下，這樣的設 計可以避免開關230持續的於導通、截止之間切換之問題。 The overcurrent reference voltage Vroc is generated by a current source I2 flowing through an overcurrent reference resistor and provided to the inverting terminal of the comparator 225 of the protection circuit. The compensation reference resistor can be an external resistor coupled to the protection circuit through a pin of the line loss compensation circuit 200. The overcurrent reference resistors of the line loss compensation circuit 200 may be the same or different. For example, the line loss compensation circuit 200 of the embodiment is coupled to the overcurrent reference resistors Roc1 and Roc2 respectively to make a better circuit for different application environments or loads. Settings. The protection circuit can additionally add a latching circuit 220 coupled to the comparator 225. When an overcurrent occurs, the latching circuit 220 performs latching protection such that the driver circuit 210 continues to turn off the switch 230 until the circuit is restarted. In the case where the overcurrent cannot be simply cancelled by suspending the output load current, such a setting It is possible to avoid the problem that the switch 230 continues to switch between on and off.
另外，在圖2的輸出電容Co設置於直流輸出電路250與線損補償電路之間，而本實施例則以輸出電容Co1及Co2分別設置於對應的線損補償電路200及負載之間。如此，輸出電容Co1及Co2的電容值可以根據負載RI1及RL2進行較佳的配置。 In addition, the output capacitor Co of FIG. 2 is disposed between the DC output circuit 250 and the line loss compensation circuit. In the present embodiment, the output capacitors Co1 and Co2 are respectively disposed between the corresponding line loss compensation circuit 200 and the load. Thus, the capacitance values of the output capacitors Co1 and Co2 can be better configured according to the loads RI1 and RL2.
兩個線損補償電路200中補償電路的開關240分別透過補償電阻Rc1及Rc2耦接至電阻R1及R2的串聯點，藉由調整電阻R1及R2的原來分壓比例而達到補償的效果。當然，補償電阻Rc1及Rc2的阻值可以不同，以提供彈性的電路設置。而為了理解方便，以下以補償電阻Rc1及Rc2具有相同阻值為例進行說明。 The switch 240 of the compensation circuit of the two line loss compensation circuits 200 is coupled to the series connection point of the resistors R1 and R2 through the compensation resistors Rc1 and Rc2, respectively, and the compensation effect is achieved by adjusting the original voltage division ratio of the resistors R1 and R2. Of course, the resistance values of the compensation resistors Rc1 and Rc2 can be different to provide a flexible circuit arrangement. For the sake of understanding, the following description will be given by taking the same resistance values of the compensation resistors Rc1 and Rc2.
各負載的額定電流均為2A，而負載電壓的範圍為5V±0.25V。當線損補償電路200之任一的負載電流達到額定電流時，線損補償電路200進行補償以使輸出電壓Vo上升0.125V；而當兩線損補償電路200均進行補償時，可使輸出電壓Vo上升0.125V+0.125V=0.25V。實際上，補償電阻Rc1及Rc2具有相同阻值時，第二次電壓補償值會略小於第一次電壓補償值，在此我們忽略此小差異。 The rated current of each load is 2A, and the load voltage ranges from 5V ± 0.25V. When the load current of any one of the line loss compensation circuits 200 reaches the rated current, the line loss compensation circuit 200 compensates to increase the output voltage Vo by 0.125V; and when both line loss compensation circuits 200 compensate, the output voltage can be made. Vo rises by 0.125V + 0.125V = 0.25V. In fact, when the compensation resistors Rc1 and Rc2 have the same resistance value, the second voltage compensation value will be slightly smaller than the first voltage compensation value, and we ignore this small difference here.
透過圖3所示實施例的共同線損補償，輸出電壓Vo的電壓補償值對應線損補償電路所產生的補償訊號之數量以階梯方式增加，而且每次階梯增加的電壓補償值相當接 近。另外，同圖2的說明，圖3的實施例的預定補償值、電壓補償值及過流保護值可以根據應用電路的規範所容許的最大偏移值或額定值來決定，但不須一定為其額定值或最大容許偏移值。例如，在上述的例子中，預定補償值及電壓補償值可以設定為1A及0.125V、2A及0.25V、1A及0.25V等均可。而較佳的電壓補償值為輸出電壓的最大容許偏移值除以線損補償電路的數量。 Through the common line loss compensation of the embodiment shown in FIG. 3, the voltage compensation value of the output voltage Vo is increased in a stepwise manner corresponding to the number of compensation signals generated by the line loss compensation circuit, and the voltage compensation value added every time step is equivalent. near. In addition, with the description of FIG. 2, the predetermined compensation value, the voltage compensation value, and the overcurrent protection value of the embodiment of FIG. 3 may be determined according to the maximum offset value or rated value allowed by the specification of the application circuit, but not necessarily Its rating or maximum allowable offset value. For example, in the above example, the predetermined compensation value and the voltage compensation value may be set to 1A and 0.125V, 2A and 0.25V, 1A, 0.25V, or the like. The preferred voltage compensation value is the maximum allowable offset of the output voltage divided by the number of line loss compensation circuits.
圖4為應用本發明之線損補償電路的另一電源電路之電路示意圖。本實施例以三個線損補償電路為例進行說明。三個線損補償電路200均為積體電路，分別耦接於直流輸出電路250及對應負載RL1、RL2及RL3之間。線損補償電路200根據外接的補償電阻Rc1、Rc2及Rc3分別設置電壓補償值。線損補償電路200根據外接的補償參考電阻Rcs1、Rcs2及Rcs3分別設置預定補償值。線損補償電路200根據外接的過流參考電阻Roc1、Roc2及Roc3分別設置過流保護值。 4 is a circuit diagram of another power supply circuit to which the line loss compensation circuit of the present invention is applied. In this embodiment, three line loss compensation circuits are taken as an example for description. The three line loss compensation circuits 200 are integrated circuits, and are respectively coupled between the DC output circuit 250 and the corresponding loads RL1, RL2 and RL3. The line loss compensation circuit 200 sets a voltage compensation value according to the external compensation resistors Rc1, Rc2, and Rc3, respectively. The line loss compensation circuit 200 sets a predetermined compensation value according to the external compensation reference resistors Rcs1, Rcs2, and Rcs3, respectively. The line loss compensation circuit 200 sets an overcurrent protection value according to the external overcurrent reference resistors Roc1, Roc2, and Roc3, respectively.
另外，在線損補償電路200與各自的補償電阻Rc1、Rc2及Rc3之間均額外加入二極體D，其中，二極體D的正端耦接補償電阻Rc1、Rc2及Rc3中對應的補償電阻，負端耦接線損補償電路200。二極體D的加入，使得線損補償電路200的補償由共同補償變為選擇補償。當線損補償電路200之任一進行線損補償時，則電壓補償值則由此線損補償電路200為主被決定。換句話說，當三個線損補償電路200最早進行補償 者，將決定電壓補償值並進行一次性的補償，而非圖3所示實施例般的階梯式補償。因此，本實施例的補償電阻Rc1、Rc2及Rc3是可以設定各自的電壓補償值，以配合實際的電路應用達到較佳的補償效果。當然，假設實際應用環境無法具體確定時，較佳的電壓補償值應該根據輸出電壓最大容許偏移量，例如：0.25V，來設置，是一個較佳的作法。 In addition, a diode D is additionally added between the line loss compensation circuit 200 and the respective compensation resistors Rc1, Rc2, and Rc3, wherein the positive terminal of the diode D is coupled to the corresponding compensation resistors of the compensation resistors Rc1, Rc2, and Rc3. The negative terminal is coupled to the wiring loss compensation circuit 200. The addition of the diode D causes the compensation of the line loss compensation circuit 200 to change from the common compensation to the selection compensation. When any of the line loss compensation circuits 200 performs line loss compensation, the voltage compensation value is determined mainly by the line loss compensation circuit 200. In other words, when the three line loss compensation circuits 200 are compensated at the earliest The voltage compensation value will be determined and compensated once, instead of the stepped compensation as in the embodiment shown in FIG. Therefore, the compensation resistors Rc1, Rc2, and Rc3 of the present embodiment can set respective voltage compensation values to achieve a better compensation effect in accordance with actual circuit applications. Of course, if the actual application environment cannot be specifically determined, the preferred voltage compensation value should be set according to the maximum allowable offset of the output voltage, for example, 0.25V, which is a preferred method.
圖5為應用本發明之線損補償電路的再一電源電路之電路示意圖。相較於圖4所示的實施例，主要差異點在於輸出電容Co的設置，以及補償電阻的共用。圖5除了於線損補償電路200與負載RL1、RL2及RL3之間分別設置輸出電容Co1、Co2及Co3外，也於直流輸出電路250及線損補償電路200之間設置輸出電容Co。如此，可以達到更佳的穩壓效果。而二極體D透過單一補償電阻Rc耦接至電阻R1及R2的串聯點，不僅節省補償電阻的數量而達到降低成本之優點，並可以將各自設定電壓補償值簡化成單一電壓補償值。 Fig. 5 is a circuit diagram showing still another power supply circuit to which the line loss compensation circuit of the present invention is applied. Compared to the embodiment shown in Figure 4, the main difference is the setting of the output capacitance Co and the sharing of the compensation resistors. 5, in addition to the output capacitances Co1, Co2, and Co3, respectively, between the line loss compensation circuit 200 and the loads RL1, RL2, and RL3, the output capacitance Co is also provided between the DC output circuit 250 and the line loss compensation circuit 200. In this way, a better voltage regulation effect can be achieved. The diode D is coupled to the series connection point of the resistors R1 and R2 through a single compensation resistor Rc, which not only saves the number of compensation resistors, but also reduces the cost, and can simplify the respective set voltage compensation values into a single voltage compensation value.
圖6為根據本發明之一第三較佳實施例之線損補償電路之電路示意圖。線損補償電路300耦接於一直流輸出電路(未繪出)之一輸出電壓Vo及一負載RL之間，而線損補償電路與負載RL之間透過一電源線連接。一輸出電容Co耦接線損補償電路的輸出端，以穩定提供給負載RL之一補償輸出電壓Vo’。線損補償電路300包含一電流偵測電路340、一迴授控制電路以及一補償電路。電流偵測電路包含一放大器 335、一電流偵測電阻Rcd、一電晶體336及一電流鏡，以偵測一負載電流之電流大小。放大器335之一反相端透過電流偵測電阻Rcd耦接一電晶體330之一端，而一非反相端耦接電晶體330之另一端。放大器335的一輸出端耦接電晶體336，並根據非反相端及反相端的訊號控制電晶體336的等效阻抗，使非反相端及反相端的訊號的準位一致。如此，流經電流偵測電阻Rcd及電晶體336的電流會正比於流經電晶體330的負載電流。電流鏡複製流經電流偵測電阻Rcd的電流做為一電流偵測訊號，並提供至補償電路。在本實施例，電流之方向為由補償電路流入至電流鏡。 6 is a circuit diagram of a line loss compensation circuit in accordance with a third preferred embodiment of the present invention. The line loss compensation circuit 300 is coupled between an output voltage Vo of a DC output circuit (not shown) and a load RL, and the line loss compensation circuit is connected to the load RL through a power line. An output capacitor Co coupled to the output of the line loss compensation circuit to provide a stable output voltage Vo' to one of the loads RL. The line loss compensation circuit 300 includes a current detection circuit 340, a feedback control circuit, and a compensation circuit. Current detecting circuit includes an amplifier 335. A current detecting resistor Rcd, a transistor 336 and a current mirror to detect a current of a load current. An inverting terminal of one of the amplifiers 335 is coupled to one end of a transistor 330 through a current detecting resistor Rcd, and a non-inverting terminal is coupled to the other end of the transistor 330. An output of the amplifier 335 is coupled to the transistor 336, and controls the equivalent impedance of the transistor 336 according to the signals of the non-inverting terminal and the inverting terminal to make the signals of the non-inverting terminal and the inverting terminal coincide. As such, the current flowing through the current detecting resistor Rcd and the transistor 336 is proportional to the load current flowing through the transistor 330. The current mirror replicates the current flowing through the current detecting resistor Rcd as a current detecting signal and supplies it to the compensation circuit. In this embodiment, the direction of the current flows from the compensation circuit to the current mirror.
補償電路包含一補償電阻Rco、一放大器345、一電流源I及一補償參考電阻Rcs。補償參考電阻Rcs耦接放大器345的一非反相端及一輸出端，而電流偵測電路340的電流鏡所提供的電流流經補償參考電阻Rcs，因此補償參考電阻Rcs的跨壓正比於負載電流。電流源I的提供電流流經電流偵測電阻Rcd，並產生一補償參考電壓Vrcs至放大器345的一反相端。放大器345的反相端及非反相之電位為等電位，因此放大器345輸出端所輸出的一補償訊號之電位為補償參考電壓Vrcs加上補償參考電阻Rcs的跨壓。所以，補償訊號之電位隨負載電壓(電流偵測訊號)變化。在本實施例，當負載電流越大時，補償訊號之電位也隨之提高。 The compensation circuit includes a compensation resistor Rco, an amplifier 345, a current source I, and a compensation reference resistor Rcs. The compensation reference resistor Rcs is coupled to a non-inverting terminal and an output terminal of the amplifier 345, and the current supplied by the current mirror of the current detecting circuit 340 flows through the compensation reference resistor Rcs, so the cross-voltage of the compensation reference resistor Rcs is proportional to the load. Current. The current supplied from the current source I flows through the current detecting resistor Rcd and generates a compensation reference voltage Vrcs to an inverting terminal of the amplifier 345. The inverting terminal of the amplifier 345 and the non-inverting potential are equipotential, so the potential of a compensation signal outputted from the output of the amplifier 345 is the compensation reference voltage Vrcs plus the crossover voltage of the compensation reference resistor Rcs. Therefore, the potential of the compensation signal varies with the load voltage (current detection signal). In this embodiment, when the load current is larger, the potential of the compensation signal is also increased.
迴授控制電路包含一誤差放大器315及一驅 動電路310。誤差放大器315的一非反相端耦接放大器345的輸出端，一反相端接收代表補償輸出電壓Vo’之一迴授訊號。在本實施例，迴授訊號係由一分壓器偵測補償輸出電壓Vo’而產生，分壓器包含串聯之電阻R1’及R2’。誤差放大器根據反相端及非反相端之訊號電位透過驅動電路310控制電晶體330上之一跨壓。當負載電流變大時，電晶體330之跨壓變小使補償輸出電壓Vo’上升；當負載電流變小時，電晶體330之跨壓變大使補償輸出電壓Vo’下降。透過電晶體330之跨壓的調整，而達到補償線損補償電路與負載RL之間的電源線之線損。 The feedback control circuit includes an error amplifier 315 and a drive The circuit 310. A non-inverting terminal of the error amplifier 315 is coupled to the output of the amplifier 345, and an inverting terminal receives a feedback signal representative of the compensated output voltage Vo'. In this embodiment, the feedback signal is generated by a voltage divider detecting the compensated output voltage Vo', and the voltage divider includes series resistors R1' and R2'. The error amplifier controls one of the voltage across the transistor 330 through the driving circuit 310 according to the signal potential of the inverting terminal and the non-inverting terminal. When the load current becomes large, the voltage across the transistor 330 becomes smaller, causing the compensation output voltage Vo' to rise; when the load current becomes smaller, the voltage across the transistor 330 becomes larger, causing the compensation output voltage Vo' to decrease. Through the adjustment of the voltage across the transistor 330, the line loss of the power line between the line loss compensation circuit and the load RL is compensated.
線損補償電路300可以為積體電路，電流偵測電路340、一迴授控制電路以及一補償電路封裝於單一封裝體之內，並透過一腳位耦接一補償設定元件，即補償參考電阻Rcs。使用者可調整補償參考電阻Rcs而達到調整線損補償電路300之補償量之效果。 The line loss compensation circuit 300 can be an integrated circuit. The current detection circuit 340, a feedback control circuit, and a compensation circuit are packaged in a single package, and coupled to a compensation setting component through a pin, that is, a compensation reference resistor. Rcs. The user can adjust the compensation reference resistance Rcs to achieve the effect of adjusting the compensation amount of the line loss compensation circuit 300.
在本實施例，線損補償電路300可額外包含一保護電路。保護電路包含一閉鎖電路320、一過流判斷電路、一電流源I及一過流參考電阻Roc。過流判斷電路包含一比較器325。電流源I提供一電流流經過流參考電阻Roc以產生一過流參考電壓Vroc至比較器325的一反相端。比較器325的一非反相端耦接電晶體330的一端，以偵測補償輸出電壓Vo’。當補償輸出電壓Vo’高於過流參考電壓Vroc時，代表負載電流高於一過流保護值，比較器325輸出一保護訊號Sp至閉鎖電路 320。此時，閉鎖電路320進行閉鎖保護，使驅動電路310截止電晶體330以停止負載電流IL提供至負載RL直至電路重啟為止。其中，過流保護值大於預定補償值，一般而言大於或等於線損補償電路300的一額定輸出電流。 In this embodiment, the line loss compensation circuit 300 may additionally include a protection circuit. The protection circuit includes a latching circuit 320, an overcurrent determining circuit, a current source I, and an overcurrent reference resistor Roc. The overcurrent determination circuit includes a comparator 325. Current source I provides a current flow through current reference resistor Roc to generate an overcurrent reference voltage Vroc to an inverting terminal of comparator 325. A non-inverting terminal of the comparator 325 is coupled to one end of the transistor 330 to detect the compensated output voltage Vo'. When the compensated output voltage Vo' is higher than the overcurrent reference voltage Vroc, the representative load current is higher than an overcurrent protection value, and the comparator 325 outputs a protection signal Sp to the latch circuit. 320. At this time, the latch circuit 320 performs latching protection to cause the drive circuit 310 to turn off the transistor 330 to stop the load current IL from being supplied to the load RL until the circuit is restarted. The overcurrent protection value is greater than a predetermined compensation value, and is generally greater than or equal to a rated output current of the line loss compensation circuit 300.
當然，保護電路也可以同時被封裝在單一封裝體之內，使得本發明的線損補償電路達到積體電路化。而一過流設定元件(即過流參考電阻Roc)可以為透過一腳位外接，在積體電路化之同時，能保有電路之適應性。 Of course, the protection circuit can also be packaged in a single package at the same time, so that the line loss compensation circuit of the present invention reaches the integrated circuit. An overcurrent setting component (ie, the overcurrent reference resistor Roc) can be externally connected through a pin, and the circuit can be circuitized while maintaining the adaptability of the circuit.
如上所述，本發明完全符合專利三要件：新穎性、進步性和產業上的利用性。本發明在上文中已以實施例揭露，然熟習本項技術者應理解的是，該實施例僅用於描繪本發明，而不應解讀為限制本發明之範圍。應注意的是，舉凡與該實施例等效之變化與置換，均應設為涵蓋於本發明之範疇內。因此，本發明之保護範圍當以下文之申請專利範圍所界定者為準。 As described above, the present invention fully complies with the three requirements of the patent: novelty, advancement, and industrial applicability. The present invention has been disclosed in the foregoing, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the present invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of the invention is defined by the scope of the following claims.
210‧‧‧驅動電路 210‧‧‧Drive circuit
225‧‧‧比較器 225‧‧‧ comparator
230‧‧‧開關 230‧‧‧ switch
235‧‧‧放大器 235‧‧Amplifier
240‧‧‧開關 240‧‧‧ switch
245‧‧‧比較器 245‧‧‧ Comparator
250‧‧‧直流輸出電路 250‧‧‧DC output circuit
Co‧‧‧輸出電容 Co‧‧‧ output capacitor
FB‧‧‧迴授端 FB‧‧‧reporting end
IL‧‧‧負載電流 IL‧‧‧load current
R1、R2‧‧‧電阻 R1, R2‧‧‧ resistance
Rc‧‧‧補償電阻 Rc‧‧‧compensation resistor
Rcd‧‧‧電流偵測電阻 Rcd‧‧‧ current detecting resistor
RL‧‧‧負載 RL‧‧ load
Sc‧‧‧電流偵測訊號 Sc‧‧‧ current detection signal
Sj‧‧‧判斷訊號 Sj‧‧‧judging signal
Sp‧‧‧保護訊號 Sp‧‧‧protection signal
Vo‧‧‧輸出電壓 Vo‧‧‧ output voltage
Vout‧‧‧輸出端 Vout‧‧‧ output
Vrcs‧‧‧補償參考電壓 Vrcs‧‧‧compensated reference voltage
Vroc‧‧‧過流參考電壓 Vroc‧‧‧Overcurrent reference voltage
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| JPS5899812A (en) * | 1981-12-09 | 1983-06-14 | Fuji Electric Co Ltd | Voltage controller of electric power supply unit |
| EP1278284A1 (en) * | 2001-07-16 | 2003-01-22 | Axa Power A/S | Cable voltage drop compensation in an electric power supply system |
| US8035254B2 (en) * | 2007-04-06 | 2011-10-11 | Power Integrations, Inc. | Method and apparatus for integrated cable drop compensation of a power converter |
| TW201212504A (en) * | 2010-09-15 | 2012-03-16 | Analog Vision Technology Inc | Active wire compensation circuit and controller with the same |
| CN103605395A (en) * | 2013-10-30 | 2014-02-26 | 徐州市恒源电器有限公司 | Self-compensating line loss circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5899812A (en) * | 1981-12-09 | 1983-06-14 | Fuji Electric Co Ltd | Voltage controller of electric power supply unit |
| EP1278284A1 (en) * | 2001-07-16 | 2003-01-22 | Axa Power A/S | Cable voltage drop compensation in an electric power supply system |
| US8035254B2 (en) * | 2007-04-06 | 2011-10-11 | Power Integrations, Inc. | Method and apparatus for integrated cable drop compensation of a power converter |
| TW201212504A (en) * | 2010-09-15 | 2012-03-16 | Analog Vision Technology Inc | Active wire compensation circuit and controller with the same |
| CN103605395A (en) * | 2013-10-30 | 2014-02-26 | 徐州市恒源电器有限公司 | Self-compensating line loss circuit |
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