TWM284921U

TWM284921U - Linear voltage regulator with improved responses to source transients

Info

Publication number: TWM284921U
Application number: TW94214948U
Authority: TW
Inventors: Ya-Der Tain; Yung-Chih Chen
Original assignee: Aimtron Technology Corp
Priority date: 2005-08-30
Filing date: 2005-08-30
Publication date: 2006-01-01

Description

M284921 八、新型說明：【新型所屬之技術領域】本新型係關於一種線性電壓調節器，尤其關於一種在輸入源發生瞬間變化時仍可有效控制輸出電壓之線性電壓調節器。【先前技術】M284921 VIII. New Description: [New Technology Field] This new type is about a linear voltage regulator, especially a linear voltage regulator that can effectively control the output voltage when the input source changes instantaneously. [Prior Art]

圖1(A)顯示習知的線性電壓調節器1〇之電路圖。線性電壓調節器1 〇主要係由一調節電晶體丨丨、一電壓回授電路12、與一誤差放大電路13所構成的一回授控制迴路。電壓回授電路12典型上係藉由串聯電阻R1與R2所形成的分壓電路來實施，用以產生一回授信號Vfb，作為輸出電壓vcut之代表。基於回授信號Vfb與一預定的參考電壓 Vref間之比較，誤差放大電路13產生一誤差信號Verr。隨後，誤差k唬verr施加至調節電晶體丨丨之控制電極。調節電S日體1 1之第_通道電極接收_輸人電壓源，而第一通道電極提供一輸出電壓至負冑14。藉由誤差信號 Ve=適田地控制调節電晶體i i之電流通道導通狀態，故能有效地維持輸出電壓v_於所期望的調節值並供應所需要 a不幸地，當輸入電壓源Vin發生瞬間變化時，調節電 :體11之操作狀態亦發生劇烈地變動，導致輸出電壓偏離調節值且造成震湯战農羞現象。參照圖1(B)，假設在時間夺輸入電壓源Vin瞬間變大，則因為調節電晶體11 M284921 之源極係連接於輸入電壓源Vin，所、極與問極間之電位差Vsg隨而同步畴電曰:體源源極問極間電位差Vsg迅速提高了調體的度，因而引起流經調節電晶體η :通程種多餘料道電Μ將轉而對於輸暴增^ 輸出電壓U上升。雖然藉由誤差放大電二3充之電口：致制’輸出電壓VDut終究會恢復：控 ==出電壓V-之劇烈變化與長時間的震 …、沄兩足4多應用規格之要求。則調I;電：“又在時間T2時’輸入電壓源Vin瞬間變小，變小。突:變=源極與間極間之電壓Vsg隨而同步瞬間Fig. 1(A) shows a circuit diagram of a conventional linear voltage regulator 1〇. The linear voltage regulator 1 〇 is mainly composed of a regulating transistor 丨丨, a voltage feedback circuit 12, and a feedback amplifying circuit 13 to form a feedback control loop. The voltage feedback circuit 12 is typically implemented by a voltage divider circuit formed by series resistors R1 and R2 for generating a feedback signal Vfb as representative of the output voltage vcut. Based on the comparison between the feedback signal Vfb and a predetermined reference voltage Vref, the error amplifying circuit 13 generates an error signal Verr. The error k唬verr is then applied to the control electrode that regulates the transistor. The first channel electrode of the sigmoidal body 1 receives the input voltage source, and the first channel electrode provides an output voltage to the negative 胄14. By controlling the current channel conduction state of the adjustment transistor ii by the error signal Ve=field, it is possible to effectively maintain the output voltage v_ at the desired adjustment value and supply the required a. Unfortunately, when the input voltage source Vin changes instantaneously At the time of adjustment, the operating state of the body 11 also fluctuates drastically, causing the output voltage to deviate from the adjustment value and causing a shocking phenomenon. Referring to FIG. 1(B), assuming that the input voltage source Vin becomes instantaneously large at the time, since the source of the adjustment transistor 11 M284921 is connected to the input voltage source Vin, the potential difference Vsg between the pole and the pole is synchronized. Domain electric field: The potential difference Vsg between the source and the source rapidly increases the degree of the modulation, thus causing the flow through the adjustment transistor η: the excess material of the pass type will turn to increase the output voltage U for the transmission. Although the electric port is amplified by the error amplifier 2: The output voltage VDut will eventually recover: control == the drastic change of the voltage V- and the long-term shock ..., the two-footed application requirements of more than four applications. Then adjust I; electricity: "At time T2" input voltage source Vin instantly becomes smaller and smaller. sudden: change = voltage between the source and the interpole Vsg and then synchronize

vsg^PflJ7^ft3M 出電壓 V — — — ^ 所八、°ut終究會恢復至所設定的調節值，例如時間T3 :，然而輸出電壓ν_之劇烈變化與長時間的震盪 .，、占均無法滿足許多應^規格之要求、曰曰濟度’甚至完全關閉電流通道而造成流經調節電電六Γ <通道電流Iq迅速降低至零。在此情況下，輸出壓ζ _必須放電以便補足負載電流之需求，導致輪出電出電::降。雖然猎由誤差放大電路13之回授控制，輸 V〇Ut終* A上> 乂釭一… 【新型内容】入、、，t新型之目的在於提供一種線性電壓調節器，可在輸變:發生瞬間變化時避免調節電晶體之操作狀態劇烈地因而有效地改善輸出電壓之調節穩定度。 6 M284921 於該回授信號與一預定的參考電壓間之比較，誤差放大電路產生-誤差信號，用以控制該控制電極。事件偵測電路耦合於該輸入電壓源，用以產生一事件信號，其指示該輸入電壓源之一瞬間變化事件。回應於該事件信號，賦能控制電路產生一賦能信號。回應於該賦能信號，電壓限制電路限制該第一通道電極與該控制電極間之一電位差。依據本新型之線性電壓調節器包括一調節電晶體、一回授電路、一誤差放大電路、一事件谓測電路、：賦能：制電路、以及一電壓限制電路。調節電晶體具有一控制^ 極、-第-通道電極m道電極。第—通道電極係連接於一輸入電壓源而該第二通道電極係提供一輸出電壓。回授電路產纟一回授㈣，其π表該輸出電壓。基Vsg^PflJ7^ft3M Output voltage V — — — ^ 八 , ° ut will eventually return to the set adjustment value, such as time T3 :, however, the output voltage ν _ dramatic changes and long-term oscillations. Can not meet the requirements of many specifications, the degree of economical 'even the current channel is completely closed, causing the flow through the regulated electric power six Γ < channel current Iq quickly reduced to zero. In this case, the output voltage _ must be discharged to compensate for the load current demand, resulting in a battery output:: drop. Although the hunting is controlled by the feedback of the error amplifying circuit 13, the input V〇Ut terminal*A> 乂釭一... [New content] The new purpose of the input, the, and t is to provide a linear voltage regulator that can be converted : Avoiding adjustment of the operating state of the transistor when an instantaneous change occurs is violently and thus effectively improving the regulation stability of the output voltage. 6 M284921 A comparison between the feedback signal and a predetermined reference voltage, the error amplification circuit generates an error signal for controlling the control electrode. An event detection circuit is coupled to the input voltage source for generating an event signal indicative of an instantaneous change event of the input voltage source. In response to the event signal, the enable control circuit generates an enable signal. In response to the enable signal, the voltage limiting circuit limits a potential difference between the first channel electrode and the control electrode. The linear voltage regulator according to the present invention comprises an adjustment transistor, a feedback circuit, an error amplification circuit, an event prediction circuit, an energization: a circuit, and a voltage limiting circuit. The adjustment transistor has a control electrode, a - channel electrode, and an m-channel electrode. The first channel electrode is coupled to an input voltage source and the second channel electrode provides an output voltage. The feedback circuit produces a feedback (four), and its π represents the output voltage. base

【實施方式】下文中之說明與附圖將使本新型之前述與其他目的、特徵、與優點更明顯。茲將參照圖式詳細說明依據本新型之較佳實施例。圖2(A)顯不依據本新型之線性電壓調節器2〇之電路圖。線性電壓調節器20主要係由一調節電晶體21、一電壓回授電路22、一誤差放大電路23所構成的一回授控制迴路。電壓回授電路22典型上係藉由串聯電阻R1與R2 所形成的分壓電路來實施，用以產生一回授信號Vfb，作為輸出電壓vQUt之代表。基於回授信號Vfb與一預定的參考電壓vref間之比較，誤差放大電路23產生一誤差信號 7 M284921 verr。隨後，誤差信號Verr施加至調節電晶體η之控制電極。調節電晶體21之第一通道雷、逼私極接收一輸入電壓源The foregoing and other objects, features, and advantages of the invention will be apparent from the description and drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment in accordance with the present invention will be described in detail with reference to the drawings. Fig. 2(A) shows a circuit diagram of the linear voltage regulator 2〇 according to the present invention. The linear voltage regulator 20 is mainly composed of a regulating transistor 21, a voltage feedback circuit 22, and an error amplifying circuit 23. The voltage feedback circuit 22 is typically implemented by a voltage divider circuit formed by series resistors R1 and R2 for generating a feedback signal Vfb as representative of the output voltage vQUt. Based on the comparison between the feedback signal Vfb and a predetermined reference voltage vref, the error amplifying circuit 23 generates an error signal 7 M284921 verr. Subsequently, an error signal Verr is applied to the control electrode of the adjustment transistor η. Adjusting the first channel of the transistor 21 and receiving an input voltage source

Vin，而第二通道電極提供一輸出 δ 奸 out至負載24。猎由誤差信號乂…適當地控制調節即也日日體21之電流通道導通狀悲，故能有效地維持輸出電壓v 並供應所需要的負載電流。 _於所期望的調節值 :了降低輸入電壓源、Vin發生瞬間變化時對於調節電日日體21所造成之衝擊，依據本机醤古^ ^ ^ I之線陸電壓調節器20 ::有-事件偵測電路25、一賦能控制電路％、以及一電壓限制電路27。事件偵測電路25用以偵測 Vin之瞬間變化事件，並產生一 ' i源信號DT，賦能控制電路26 牛 ^ ^ ^ .. „ ㈣此h旎S 1與第- 賦此k唬S2,用以決定電壓限制電路27 、弟一由於給入雷段、® Λ/ t效操作時間。源極閘極間電位差v ，妨^接"^调即電晶體2丨之位差vsg，故電虔限制電路2 :内使調節電晶體之源極__電位差㈣時疋的限制電壓内，防止調節電晶 ^又'";預變動。之刼作狀態劇烈地具體而言’事件侦測電路25得由 ^源II、以及一充電電流源12所構成。電容：：知係連接於輸人電㈣Vin。放電電流源 s，- Μ與-電阻R而連接於：由-電流鏡則並聯於電容Cs。春#Αφ；5_弟一鳊。充電電流源12 5爾輸入電壓源發生瞬間變^ 於跨於電容cs兩端之』欠化時，由 …位差無法發生不連續的變化，故電 M284921Vin, while the second channel electrode provides an output δ out to the load 24. Hunting is properly controlled by the error signal 乂... That is, the current channel of the Japanese body 21 is inductive, so that the output voltage v can be effectively maintained and the required load current can be supplied. _ In the desired adjustment value: the impact of the adjustment of the input voltage source and the instantaneous change of Vin for the adjustment of the electric day 21, according to the line of the local ^ ^ ^ I line voltage regulator 20 :: Yes An event detecting circuit 25, an enabling control circuit %, and a voltage limiting circuit 27. The event detecting circuit 25 is configured to detect the instantaneous change event of the Vin and generate an 'i source signal DT, and the enabling control circuit 26 牛 ^ ^ ^ .. „ (4) The h旎S 1 and the first - assign the k唬S2 , used to determine the voltage limit circuit 27, the first one due to the feeding of the thunder, the Λ / t effect operation time. The potential difference between the source gates v, the connection ^ quot; ^ is the difference between the transistor 2 v vsg, Therefore, the power limiting circuit 2: within the limiting voltage of the source __potential difference (4) of the adjusting transistor, prevents the adjustment of the electro-crystal and the '"; pre-variation. The state of the violently specific event The detecting circuit 25 is composed of a source II and a charging current source 12. The capacitor: is connected to the input power (four) Vin. The discharge current source s, - Μ and - resistor R are connected to: by - current mirror Then parallel to the capacitor Cs. Spring #Αφ; 5_弟一鳊. The charging current source 12 5 er input voltage source instantaneously changes ^ across the two ends of the capacitor c s under normalization, by ... the difference can not occur discontinuous Change, so the electricity M284921

容cs之第二端的電位亦隨同第一端之輸入電壓源vin發生瞬間變化。因此，從電容Cs之第二端可以取出所期望的事件信號DT。在電容cs之第二端的電壓瞬間變大後，放電電流源11可使第二端之電壓逐漸下降而回復至一預定的基本穩態值BV。在電容Cs之第二端的電位瞬間變小後，充電電流源12可使第二端之電位逐漸上升而回復至該預定的基本穩態值BV。在一實施例中，放電電流源^所提供的電流係設計成充電電流源12之兩倍大。賦能控制電路26具有第一比較器26a π早父 26b。基於事件信號DT與一預定的第一觸發電壓間之比較，第一比較器26a產生第一賦能信號S1。基於事件信號DT與一預定的第二觸發電壓Vts間之比較，第二比較 26b產生第一賦能信號S2。第一觸發電壓、係設計成大於該預定的基本穩態值BV，而第二觸發電壓〜則設計The potential of the second end of the capacitor cs also changes instantaneously with the input voltage source vin of the first terminal. Therefore, the desired event signal DT can be taken out from the second end of the capacitor Cs. After the voltage at the second end of the capacitor cs becomes instantaneously large, the discharge current source 11 causes the voltage at the second terminal to gradually decrease to return to a predetermined basic steady state value BV. After the potential at the second end of the capacitor Cs becomes instantaneously small, the charging current source 12 can gradually increase the potential of the second terminal to return to the predetermined basic steady state value BV. In one embodiment, the current supplied by the discharge current source is designed to be twice as large as the charge current source 12. The enable control circuit 26 has a first comparator 26a π early parent 26b. Based on a comparison between the event signal DT and a predetermined first trigger voltage, the first comparator 26a generates a first enable signal S1. Based on the comparison between the event signal DT and a predetermined second trigger voltage Vts, the second comparison 26b produces a first enable signal S2. The first trigger voltage is designed to be greater than the predetermined basic steady state value BV, and the second trigger voltage is designed

成小於該預定的基本穩態值BV。因此，當輸人電壓源V 比較器施可受到觸發而產生第-賦能n 可2到觸發：：人電壓源I瞬間變小時，第二比較器26b 了又到觸發而產生第二賦能信號S2。電壓限制電路27胃+ f ^ pp . 7具有一上側限制單元27a與一下側It is smaller than the predetermined basic steady state value BV. Therefore, when the input voltage source V comparator can be triggered to generate the first-energy n can be 2 to the trigger: the human voltage source I instantaneously becomes small, the second comparator 26b is triggered again to generate the second energization Signal S2. The voltage limiting circuit 27 has a stomach + f ^ pp. 7 with an upper side limiting unit 27a and a lower side

限制早7L 27b。第一睡处於吐卜W 有效操作時門 "§唬S1決定上侧限制單元27a之 27b之有效操作時間。^ S2則心下側限制單元圖2(B)顯示依據本新型之口圖。參照圖2(B)，上如限制早兀27a之電路 ⑻上側限制單元27a主要包含一開關單元 M284921Limit 7L 27b early. The first sleep is in the time of the effective operation of the door "§唬S1 determines the effective operation time of the upper side restriction unit 27a 27b. ^ S2 is the lower side restriction unit. Fig. 2(B) shows the mouth diagram according to the present invention. Referring to Fig. 2(B), the circuit such as the upper limit 27a is limited. (8) The upper side restriction unit 27a mainly includes a switch unit M284921.

G1，可由電晶體或傳輸閘所構成，以及一限制單元，可由電晶f Q1所構成。開關單元G1係由第一比較器26a所產生的第一賦能信號S1決定導通與否。當開關單元G1尚未導通而處於斷路狀態時，調節電晶體21之閘極僅受到誤差放大器23所產生之誤差信號所控制，亦即此時上側限制早το 27a對其並無影響。然而當第一賦能信號w 導通開關單元G1時’輸入電壓源Vin將經由電晶體Q1而耦合至調節電晶體21之閘極。由於電晶體…係耦合成— 個二極體，亦即其閘極與汲極相互連接於一起，故電晶體 Q1之作用如同-電壓限制器’可將輸入電壓源vin心節電晶體之閘極間之電位差限制在一個二極體之順向導通壓降内（倘若忽略開關單元G!之微小的導通電阻）。因此既然調節電晶體21之源極電壓係等於輸人電 i田今々 j in :即 21之源極與閘極間之電位差Vsg即限制於一個一極體之順向導通壓降内。圖2(C)顯示依據本新型之下側限制單元27b之圖。參照圖2(C)’下側限制單元2几主要包含一開關單元 :2，可由電晶體或傳輸閘所構成，以及一限制單元，由電晶體Q2、Q3、與Q4所構成。開關單元G2係由第二比較器26b所產生的笛―站的弟一賦此信號S2決定導通與否。電 …共同形成一電流鏡。電晶體⑴之没極經由1 =源二連接於地面電位，並且電晶體Q3之源 =曰體Q4而連接於輪人電壓源Vin。電晶體Q4#輕合成固一極體，亦即其閑極與汲極相互連接於一起。當開關 10 M284921 單元G2尚未導通而處力斷路狀態時，調節電晶^ 2i之問極僅受到誤差放大器23所產生之誤差㈣U所控制，亦即此時下侧限制單元27b對其並無影響。然而當第二賦 ^言號S2導通開關單以2時，輸人電壓源^將經由電曰曰體Q4以及電流鏡Q2肖q3而麵合至調節電晶體^之閘極。基於電流鏡Q2肖q3之對稱性電路特徵，電晶體 Q2之源極電壓實質上等於電晶體如之源極電壓。因此，輸入電壓源、Vin與電晶體Q2之源極電壓間之電位差係限制在-個二極體之順向導通壓降内。既然調節電晶體Η 之源極電壓係等於輸入電壓源Vin，則調節電晶體η之源極與閑極間之電位I、即限制於_個二極體之順向導通壓降内（倘若忽略開關單元G2之微小的導通電阻）。圖3顯不依據本新型之線性電壓調節器之操作波形時序圖。假設在時間TO時，輸入電壓源Vin瞬間變大，使得事件偵測電路25之事件信號DT於同—時間突缺上升而超過第一觸發電壓Vtl，因而觸發賦能控制電路^之第 -比較器26a。在此瞬間上升事件後，事件㈣町即逐漸下降以便恢復至基本穩態值BV，尤其在時間τι時變成低於第-觸發電壓Vtl。因此’第一比較器2“所產生的第一賦能信號S1係一脈衝信號，用以在時間τ〇至時間 T1内賦能上側限制單元27a。從時間τ〇至上側限制單…有效操作時間，於此期間中調it 體2丨不會過度導通而飽和，顯著地改善電晶體電流、與輸出電壓乂_之反應。 q M284921 Z樣地，假設在時間T2時，輸入電壓源、Vin瞬間變小， =事件㈣電路25之事件信號DT於同—時間突然下降而低於第二觸發電壓Vi2，因而觸發賦能路二比較器26b。在此瞬間下降事件後，拿杜^ & 肀什俊事件信號DT即逐漸上升以便恢復至基本穩態值心，尤其在時間τ3時變成超過第二觸發電壓Vt2。因此’第二比較器㈣所產生的第二職能信號S2係一脈衝信號’用以在時間τ2至時間G1 may be composed of a transistor or a transfer gate, and a limiting unit may be formed by an electro-crystal f Q1. The switching unit G1 determines whether the first enabling signal S1 generated by the first comparator 26a is turned on or not. When the switching unit G1 is not turned on and is in the open state, the gate of the regulating transistor 21 is only controlled by the error signal generated by the error amplifier 23, that is, the upper side restriction το 27a has no influence thereon. However, when the first enable signal w turns on the switching unit G1, the input voltage source Vin will be coupled to the gate of the regulating transistor 21 via the transistor Q1. Since the transistor... is coupled into a diode, that is, the gate and the drain are connected to each other, the transistor Q1 functions as a voltage limiter, and the gate of the input voltage source vin is saved. The potential difference between the two is limited to the forward voltage drop of a diode (if the tiny on-resistance of the switching unit G! is ignored). Therefore, since the source voltage of the adjustment transistor 21 is equal to the input power, the potential difference Vsg between the source and the gate of 21 is limited to the forward voltage drop of a single pole. Fig. 2(C) shows a diagram of the lower side restricting unit 27b according to the present invention. Referring to Fig. 2(C), the lower limiting unit 2 mainly includes a switching unit: 2, which may be constituted by a transistor or a transmission gate, and a limiting unit composed of transistors Q2, Q3, and Q4. The switching unit G2 determines whether the signal is determined to be on or off by the second channel of the flute station generated by the second comparator 26b. Electric ... together form a current mirror. The pole of the transistor (1) is connected to the ground potential via 1 = source 2, and the source of the transistor Q3 = the body Q4 is connected to the wheel voltage source Vin. The transistor Q4# is lightly synthesized and solidified, that is, its idle pole and the drain are connected to each other. When the switch 10 M284921 unit G2 has not been turned on and is in the state of disconnection, the polarity of the adjustment transistor 2 is only controlled by the error (4) U generated by the error amplifier 23, that is, the lower limit unit 27b has no influence thereon. . However, when the second switch S2 turns on the switch by 2, the input voltage source ^ will be connected to the gate of the adjustment transistor via the body Q4 and the current mirror Q2. Based on the symmetrical circuit characteristics of the current mirror Q2, the source voltage of the transistor Q2 is substantially equal to the source voltage of the transistor. Therefore, the potential difference between the input voltage source, the source voltage of Vin and the transistor Q2 is limited to the forward voltage drop of the two diodes. Since the source voltage of the adjustment transistor 等于 is equal to the input voltage source Vin, the potential I between the source and the idle pole of the transistor η is adjusted, that is, limited to the forward voltage drop of the _ diodes (if ignored) A small on-resistance of the switching unit G2). Figure 3 shows an operational waveform timing diagram for a linear voltage regulator in accordance with the present invention. It is assumed that at time TO, the input voltage source Vin becomes instantaneously large, so that the event signal DT of the event detecting circuit 25 rises at the same time and exceeds the first trigger voltage Vtl, thus triggering the first comparison of the energization control circuit ^ 26a. After this momentary rise event, the event (4) is gradually lowered to return to the basic steady state value BV, especially below the first trigger voltage Vtl at time τι. Therefore, the first enable signal S1 generated by the 'first comparator 2' is a pulse signal for energizing the upper limiting unit 27a from time τ〇 to time T1. From time τ〇 to the upper limit order... effective operation Time, during which the intermediate body 2 is not over-conducted and saturated, significantly improving the transistor current and reacting with the output voltage 乂_ q M284921 Z-like ground, assuming the input voltage source, Vin at time T2 Instantly becomes smaller, the event signal DT of the event (4) circuit 25 suddenly drops below the second trigger voltage Vi2 at the same time, thus triggering the energizing path two comparator 26b. After this momentary falling event, take Du & The Kush Jun event signal DT gradually rises to return to the basic steady state value center, especially when the time τ3 becomes the second trigger voltage Vt2. Therefore, the second function signal S2 generated by the second comparator (4) is a pulse signal. 'Used at time τ2 to time

Τ3内賦能下側限制單元27b。從時間丁2至時間τ3可視為下側限制單元27b之有效操作時間，於此期間内調節電晶體Η不會過度導通而飽和，有效地改善電晶體電流^與輸出電壓Vout2反應。雖然前述實施例係同時使用第一與第二比較器26a與 26b以及上侧與下側限制單元27a與27b，因而對於輸二電壓源Vin之瞬間變大與瞬間變小均可達成有效的改善，但本新型亦得應用於只須改善單一瞬間變化方向之情況。具體而言，倘若只想改善對於輸入電壓源Vin之瞬間變大之反應，則可僅使用第一比較器26a與上侧限制單元 27a。另一方面，倘若只想改善對於輸入電壓源之瞬間變小之反應，則可僅使用第二比較器26b與下侧限制單元 27b 〇雖然本新型業已藉由較佳實施例作為例示加以說明，應瞭解者為：本新型不限於此被揭露的實施例。相反地，本新型意欲涵蓋對於熟習此項技藝之人士而言係明顯的各種修改與相似配置。因此，申請專利範圍之範圍應根 12 M284921 據最廣的詮釋，以包容所有此類修改與相似配置【圖式簡單說明】圖1(A)顯示習知的線性電壓調節器之電路回。時序圖UB)顯示習知的線性電壓調節器之操作圖波形 =(:示依Γ新型之線性電遷調節器之電路圖。 ;(B)顯不依據本新型之上側限制單元之電路圖。序圖咖口㈣料元之電路圖。 ^ 之線性電㈣節ϋ之操作波形時〇【主要元件符號說明】 i〇, 20 線性電壓調節器 "，21 調節電晶體 !2? 22 電壓回授電路 !3? 23 誤差放大電路 !49 24 負載 25 事件偵測電路 26 賦能控制電路 26a 第一比較器 26b 第二比較器 27 電壓限制電路 13 M284921 27a 上側限制單元 27b 下側限制單元 Rl， R2, R 電阻 cout，cs 電容 Vin 輸入電壓源 V〇ut 輸出電壓The lower side restriction unit 27b is energized in the crucible 3. The time □2 to the time τ3 can be regarded as the effective operation time of the lower side limiting unit 27b, during which the adjustment of the transistor Η is not excessively turned on and saturated, effectively improving the transistor current and reacting with the output voltage Vout2. Although the foregoing embodiment uses the first and second comparators 26a and 26b and the upper and lower side limiting units 27a and 27b at the same time, an effective improvement can be achieved in the case where the instantaneous voltage source Vin becomes large and instantaneously small. However, this novel also has to be applied to situations where it is only necessary to improve the direction of a single momentary change. Specifically, if only the reaction to increase the instantaneous input voltage source Vin is desired, only the first comparator 26a and the upper limiting unit 27a can be used. On the other hand, if only the reaction to the transient reduction of the input voltage source is to be improved, only the second comparator 26b and the lower limiting unit 27b can be used, although the present invention has been exemplified by the preferred embodiment. It should be understood that the present invention is not limited to the disclosed embodiments. On the contrary, the present invention is intended to cover various modifications and similar arrangements that are obvious to those skilled in the art. Therefore, the scope of the patent application should be based on the most extensive interpretation of 12 M284921 to accommodate all such modifications and similar configurations. [Simplified Schematic] Figure 1 (A) shows the circuit return of a conventional linear voltage regulator. Timing diagram UB) shows the operation diagram waveform of the conventional linear voltage regulator = (: shows the circuit diagram of the new linear current regulator); (B) shows the circuit diagram of the upper side limiting unit according to the present invention. Coffee circuit (four) circuit diagram of the material element ^ ^ Linear electric (four) throttling operation waveform 〇 [main component symbol description] i〇, 20 linear voltage regulator ", 21 adjustment transistor! 2? 22 voltage feedback circuit! 3? 23 error amplifier circuit! 49 24 load 25 event detection circuit 26 enable control circuit 26a first comparator 26b second comparator 27 voltage limit circuit 13 M284921 27a upper side limiting unit 27b lower side limiting unit Rl, R2, R Resistor cout, cs capacitor Vin input voltage source V〇ut output voltage

vfb 回授信號 vref 參考電壓 Verr 誤差信號 Vsg 源極閘極間電位差 vtl，Vt2 觸發電壓 BV 基本穩態值 Iq 電晶體電流 11 放電電流源 12 充電電流源 DT 事件信號 si， S2 賦能信號 M 電流鏡 Q1 〜Q4 電晶體 G1 〜G2 開關單元 14Vfb feedback signal vref reference voltage Verr error signal Vsg source gate potential difference vtl, Vt2 trigger voltage BV basic steady state value Iq transistor current 11 discharge current source 12 charge current source DT event signal si, S2 enable signal M current Mirror Q1 ~ Q4 transistor G1 ~ G2 switch unit 14

Claims

M284921 九、申請專利範圍·· 種線性電壓調節器，包含：调卽電晶體，且古知n ^ 具有一控制電極第通道電極、輪入電壓與一第二通道電極，該第—通道％„逆源而該第二通道電極係提供—輸出電壓；一回授電路，用丨、；太止壓·’ '以產生-回授信號，其代表該輪出電 -誤差放大電路，基於該回授信號與壓間之比較而產生一誤罢疋的參考電 U #差仏#,，用以控制該控一事们貞測電路1合於該輸人電壓源1^“ 事件信號’其指示該輸入電壓源之一瞬間變化事件生-號;::能控制電路，回應於該事件信號而產生—賦能信 -電壓限制電路，回應於該賦能信號道電極與該控制電極間之一電位差。制4苐一通 2. 如申請專利範圍第！項之線性㈣調節器，其中：該賦能信號係決定該電壓限制電路之—有效使得在該有效操作時間内’該第—通道電極與該控電極間之該電位差受到限制。 μ 3. 如申請專利範圍第i項之線性電壓調節器，其中·· :電：限制電路使該第一通道電極與該控制電極間之該電位差限制於-個二極體之順向導㈣降内。 15 M284921 4·如申請專利範圍第該事件偵測電路 1項之線性電壓調節器包含：，其中：一電容，連接於該輸入電壓信號，以及具有一第一端與一第二端，該第一端係源，该第二端係提供一電壓作為該事件M284921 IX. Patent Application Range · A linear voltage regulator, comprising: a tuning transistor, and the conventional n ^ has a control electrode channel electrode, a wheeling voltage and a second channel electrode, the first channel % „ Inverting the source and the second channel electrode provides an output voltage; a feedback circuit, using 丨,; too stop voltage '' to generate a feedback signal, which represents the wheel output-error amplification circuit, based on the A comparison between the signal and the voltage is generated, and a reference power U #差仏# is generated, and the control circuit 1 is used to control the input voltage source 1^ "event signal" indicating the One of the input voltage sources instantaneously changes the event-number;:: the control circuit generates a response-signal-voltage limiting circuit in response to the event signal, in response to a potential difference between the energizing signal electrode and the control electrode . System 4 苐 one pass 2. If you apply for patent scope! The linear (four) regulator of the item, wherein: the energizing signal determines that the voltage limiting circuit is active such that the potential difference between the first channel electrode and the control electrode is limited during the effective operating time. μ 3. As in the linear voltage regulator of the scope of claim i, wherein: the electricity: the limiting circuit limits the potential difference between the first channel electrode and the control electrode to a diode (four) drop Inside. 15 M284921 4. The linear voltage regulator of the event detecting circuit 1 includes: wherein: a capacitor connected to the input voltage signal, and having a first end and a second end, the first One end is a source, and the second end provides a voltage as the event

一電流源，用以允許該第復至一預定的基本穩態值。二端所提供的該電壓恢 5·如申請專利範圍第4項之線性電壓調節器，其中：該電流源包含：放電電流源，用以允許該第二端所提供的該電壓下降至該基本穩態值，以及一充電電流源，用以允許該第二端所提供的該電壓上升至該基本穩態值。 6·如申請專利範圍第丨項之線性電壓調節器，其中：該電壓限制電路包含：一開關單元，由該賦能信號決定其導通與否，以及一限制單元，用以於該開關單元導通時限制該第一通道電極與該控制電極間之該電位差。 7 ·如申請專利範圍第6項之線性電壓調節器，其中： M284921 該限制單元係由一耦合成— 體的電晶體所實施並且串如於該輸入電壓源與該開關單元間。 8·如申睛專利範圍第6項之線性電壓調節器，其中·· /限制單元係由一耦合成二極體的電晶體盥一電流鏡所實施，使得該麵合成二極體的電晶體係連接：該輸入電壓源與该電流鏡間，且該開關單元係連接於該控制電極與該電流鏡間。 9.如申請專利範圍第1項之線性電壓調節器，其中：該賦能信號包含一第一賦能信號與一第二賦能俨號，並且 β 該賦能控制電路包含：一第一比較器，用以基於該事件信號與一預定的第一觸發電壓間之比較而產生該第一賦能信號，以及一第二比較器，用以基於該事件信號與一預定的第二觸發電壓間之比較而產生該第二賦能信號，其中：該第一觸發電壓係設計成大於該第二觸發電壓。 1 0 ·如申請專利範圍第1項之線性電壓調節器，其中· 該電壓限制電路包含：一上側限制單元，耦合於該輸入電壓源與該控制電極間，用以於該輸入電壓源瞬間變大時， — 市J該第一通 17 M284921 道電極與該控制電極間之該電位差，以及一下側限制單元，耦合於該控制電極與一地面電位間，用以於該輸入電壓源瞬間變小時，限制該第一通道電極與該控制電極間之該電位差。A current source for allowing the first to settle to a predetermined substantially steady state value. The voltage provided by the two ends is recovered as in the linear voltage regulator of claim 4, wherein: the current source comprises: a discharge current source for allowing the voltage provided by the second terminal to drop to the basic A steady state value, and a source of charging current, to allow the voltage provided by the second terminal to rise to the substantially steady state value. 6. The linear voltage regulator of claim </ RTI> wherein: the voltage limiting circuit comprises: a switching unit, the conduction signal is determined by the enabling signal, and a limiting unit for conducting the switching unit The potential difference between the first channel electrode and the control electrode is limited. 7. A linear voltage regulator according to claim 6 wherein: M284921 the limiting unit is implemented by a coupled transistor and is interposed between the input voltage source and the switching unit. 8. The linear voltage regulator of claim 6, wherein the / / limiting unit is implemented by a transistor coupled to a diode, such that the surface of the diode is formed by a current mirror. System connection: the input voltage source is connected to the current mirror, and the switch unit is connected between the control electrode and the current mirror. 9. The linear voltage regulator of claim 1, wherein: the enable signal comprises a first enable signal and a second enable signal, and the enable control circuit comprises: a first comparison The first enabler signal is generated based on the comparison between the event signal and a predetermined first trigger voltage, and a second comparator is configured to be based on the event signal and a predetermined second trigger voltage. The second enable signal is generated by comparing, wherein: the first trigger voltage is designed to be greater than the second trigger voltage. 1 0. The linear voltage regulator of claim 1, wherein the voltage limiting circuit comprises: an upper limiting unit coupled between the input voltage source and the control electrode for instantaneously changing the input voltage source When the time is large, the potential difference between the first electrode 17 M284921 electrode and the control electrode, and the lower side limiting unit are coupled between the control electrode and a ground potential for instantaneously decreasing the input voltage source. Limiting the potential difference between the first channel electrode and the control electrode.

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