TWI710202B - 開關調節器 - Google Patents

開關調節器 Download PDF

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TWI710202B
TWI710202B TW106101761A TW106101761A TWI710202B TW I710202 B TWI710202 B TW I710202B TW 106101761 A TW106101761 A TW 106101761A TW 106101761 A TW106101761 A TW 106101761A TW I710202 B TWI710202 B TW I710202B
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comparator
circuit
switching regulator
signal
output
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TW201729525A (zh
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河野明大
後藤克也
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日商艾普凌科有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)

Abstract

本發明提供一種不會犧牲效率而消耗電流少的開關調節器。本發明採用下述結構，即，其具備計時器電路，在輕負載模式的情況下，藉由計時器電路來削減比較器的動作電流。

Description

開關調節器
本發明是有關於一種開關調節器(switching regulator)，尤其是有關於一種在輕負載時削減消耗電流的技術。
電子機器要求低功耗。尤其，智慧型手機(smartphone)、行動機器、可穿戴式(wearable)機器等為電池(battery)驅動，因此更強烈要求低耗電。開關調節器被用作各種電子機器的電壓供給源。對於開關調節器有下述要求，即，即使從輸出端子供給至負載的電流由低電流大幅變化至大電流，亦將維持高效率。
圖6是習知的開關調節器的電路圖。習知的開關調節器600包含反饋(feedback)電阻7及反饋電阻8、基準電壓電路6、比較器60、R-S正反器(flip-flop)電路62、導通時間控制電路61、輸出控制電路63、驅動器(driver)電路64、功率(power)FET(Field Effect Transistor，場效電晶體)2、電感器(inductor)3、肖特基二極體(Schottky diode)4以及電容器(condenser)5(例如參照專利文獻1)。
在負載電流從輸出端子OUT連續流動的重負載模式的情況下，功率FET2與肖特基二極體4交替地反覆導通與斷開以使輸出電壓VOUT和電源電壓VIN之比一致。該重負載模式下，功 率FET2與肖特基二極體4在開關調節器600中成為主要消耗電力的部分。
因而，開關調節器600藉由減小功率FET2的導通電阻，並減小肖特基二極體4的正向(forward)電壓Vf，從而可實現低耗電及高效率。
[現有技術文獻]
[專利文獻]
專利文獻1：美國專利第8476887號說明書
然而，在負載電流從輸出端子OUT不連續地流動的輕負載模式的情況下，比較器60的電力消耗成為主要的電力損失。
一般而言，比較器60通常消耗數μA級(order)至數十μA級的電流。因而，在從輸出端子OUT流動的負載電流為1μA以下或數μA的輕負載模式的情況下，難以維持高效率。
而且，若減小比較器60的消耗電流，則延遲將變大，因此存在輸出電壓VOUT的紋波電壓(ripple voltage)變大的問題。
為了解決習知的問題，本發明的開關調節器採用了如下所述的結構。
一種開關調節器，其特徵在於包括：比較器，對基準電壓與反饋電壓進行比較； 導通時間控制電路，控制功率FET的導通時間；R-S正反器電路，根據所述比較器的信號與所述導通時間控制電路的信號，輸出對所述功率FET進行控制的信號；以及計時器(timer)電路，接受對所述功率FET進行控制的信號而對規定時間進行計數，所述計時器電路在所述功率FET導通時開始計數，在經過所述規定時間後輸出計數完畢(count up)信號，所述比較器接受所述計數完畢信號而將動作電流切換為低消耗電流模式。
根據本發明的開關調節器，具備計時器電路，在輕負載模式的情況下，藉由計時器電路來削減比較器的動作電流，因此可削減消耗電流而不會犧牲效率。
2、32:功率FET
3:電感器
4:肖特基二極體
5:電容器
6:基準電壓電路
7、8:反饋電阻
10、20、21、60:比較器
11、61:導通時間控制電路
12、62:R-S正反器電路
13、33、63:輸出控制電路
14、34、64:驅動器電路
15:計時器電路
22:開關電路
30:反向電流檢測電路
100、200、300:開關調節器
600:習知的開關調節器
IN:輸入端子
OUT:輸出端子
Q:輸出端子
R:重置端子
S:設置端子
SW:節點
T1、T2:時機
VFB:反饋電壓
VREF:基準電壓
圖1是表示本發明的第一實施形態的開關調節器的一例的電路圖。
圖2是表示本發明的第一實施形態的開關調節器的另一例的電路圖。
圖3是表示本發明的第二實施形態的開關調節器的一例的電路圖。
圖4是表示本發明的開關調節器的輕負載模式時的節點 (node)SW的電壓與計時器電路的輸出信號的時序圖(timing chart)。
圖5是表示本發明的開關調節器的重負載模式時的節點SW的電壓與計時器電路的輸出信號的時序圖。
圖6是習知的開關調節器的電路圖的一例。
圖1是表示本發明的第一實施形態的開關調節器的一例的電路圖。
本實施形態的開關調節器100具備功率FET2、電感器3、肖特基二極體4、電容器5、基準電壓電路6、反饋電阻7及反饋電阻8、比較器10、導通時間控制電路11、R-S正反器電路12、輸出控制電路13、驅動器電路14及計時器電路15。
反饋電阻7及反饋電阻8連接於輸出端子OUT與接地(ground，GND)端子之間。比較器10的輸入端子連接於反饋電阻7及反饋電阻8的輸出端子與基準電壓電路6。R-S正反器電路12的設置(set)端子S輸入有比較器10的輸出電壓，重置(reset)端子R連接有導通時間控制電路11的輸出端子，輸出端子Q連接於導通時間控制電路11的輸入端子與輸出控制電路13的輸入端子。驅動器電路14的輸入端子連接有輸出控制電路13的輸出端子，輸出端子連接於功率FET2的閘極(gate)。功率FET2的源極(source)連接於輸入端子IN，汲極(drain)連接於電感器3的其中一個端子與肖特基二極體4的陰極(cathode)。輸出端子OUT 連接於電感器3的另一個端子與電容器5的其中一個端子。肖特基二極體4的另一個端子連接於GND端子。電容器5的另一個端子連接於GND端子。
接下來，對本實施形態的開關調節器100的動作進行說明。
當對輸入端子IN輸入電壓時，開關調節器100將輸出電壓VOUT從輸出端子OUT輸出。反饋電阻7及反饋電阻8對輸出電壓VOUT進行分壓，並輸出反饋電壓VFB。基準電壓電路6輸出基準電壓VREF。比較器10輸出對反饋電壓VFB與基準電壓VREF的電壓進行比較的信號。導通時間控制電路11根據R-S正反器電路12的輸出信號，輸出決定功率FET2的導通時間的信號。R-S正反器電路12及輸出控制電路13根據比較器10的輸出信號與導通時間控制電路11的輸出信號而生成高側(high side)的功率FET2的驅動(drive)信號，並經由驅動器電路14而輸出至功率FET2的閘極。
當輸出電壓VOUT下降而反饋電壓VFB低於基準電壓VREF時，比較器10向R-S正反器電路12的設置端子S輸出設置信號。R-S正反器電路12向輸出端子Q輸出高位準的信號。輸出控制電路13輸出低位準的信號，並經由驅動器電路14來控制功率FET2的閘極以使其導通。導通時間控制電路11接受R-S正反器電路12的輸出端子Q的高位準的信號，從而在規定時間後向R-S正反器電路12的重置端子R輸出高位準的重置信號。R-S正 反器電路12向輸出端子Q輸出低位準的信號。輸出控制電路13輸出高位準的信號，並經由驅動器電路14來控制功率FET2的閘極以使其斷開。
開關調節器100反覆進行該動作，從而自輸出端子OUT輸出所需的輸出電壓VOUT。
計時器電路15接受導通功率FET2的輸出控制電路13的低位準的信號而開始計數。並且，計時器電路15在經過規定時間後計數完畢時，向比較器10輸出信號。比較器10在收到計時器電路15的信號時，轉變至低消耗電流動作。計時器電路15若在經過規定時間前收到輸出控制電路13的低位準的信號，則將計數器重置，再次開始計數。因而，比較器10不會轉變為低消耗電流動作，而是繼續通常的電流動作。
本實施形態的開關調節器100具備以上述方式進行動作的計時器電路15，因此在重負載等通常動作中，比較器10以作為高速動作狀態的通常電流進行動作，當成為輕負載的動作時，比較器10以低消耗電流進行動作。因而，本實施形態的開關調節器100可削減消耗電流而不會犧牲效率。
另外，計時器電路15只要以功率FET2導通的時機來開始計數即可，所輸入的信號並不限定於輸出控制電路13的信號。
圖2是表示本發明的第一實施形態的開關調節器的另一例的電路圖。
在圖1中，比較器10採用了根據計時器電路15輸出的信號 來切換通常電流與低消耗電流的動作的結構。本實施形態的開關調節器200取代比較器10而具備以通常電流進行動作的比較器20、以低消耗電流進行動作的比較器21以及開關電路22。
比較器20在計時器電路15未計數完畢且開關調節器200為重負載等通常動作時進行動作。此時，比較器21停止動作，開關電路22將比較器20的輸出端子與R-S正反器電路12的設置端子S予以連接。
當計時器電路15在經過規定時間後輸出計數完畢信號時，停止比較器20的動作，開始比較器21的動作，開關電路22將比較器21的輸出端子與R-S正反器電路12的設置端子S予以連接。
如此般構成的本實施形態的開關調節器200與開關調節器100同樣，可削減消耗電流而不會犧牲效率。
進而，開關調節器200獨立地具備以通常電流進行動作的比較器20與以低消耗電流進行動作的比較器21，因此具有即使加大通常電流與低消耗電流之差，比較器的設計亦容易的效果。
另外，以上的說明中，在通常的動作中，比較器21停止動作，但比較器21亦可始終進行動作。如此，不需要用於使比較器21動作的時間，因此可由通常動作快速切換為低消耗電流動作。而且，在通常的動作中，由於比較器21的消耗電流非常小，因此不會對電路整體的消耗電流造成影響。
因而，本實施形態的開關調節器200可削減消耗電流而 不會犧牲效率。
另外，本實施形態的開關調節器的計時器電路15即使適用於同步整流型開關調節器，亦起到同樣的效果。
圖3是表示本發明的第二實施形態的開關調節器的一例的電路圖。
本實施形態的開關調節器300為同步整流型。
開關調節器300新具備輸出控制電路33、驅動器電路34、低側(low side)的功率FET32以及反向電流檢測電路30。反向電流檢測電路30監控節點SW的電壓，對在輕負載時流經電感器3的電流成為與重負載時相反方向的電流的情況進行偵測，並將檢測信號輸出至輸出控制電路33。反向電流檢測電路30進而輸入有計時器電路15的計數完畢信號，以控制動作電流。
開關調節器300的動作與普通的同步整流型開關調節器相同，因此予以省略。
當計時器電路15根據輸出控制電路33輸出的信號開始計數動作時，反向電流檢測電路30接受該信號而將動作電流設為通常的動作電流，從而進行反向檢測動作。並且，當計時器電路15輸出計數完畢信號時，此時由於不需要反向檢測動作，因此減小動作電流或將其設為零。
由於具備如此般構成的反向電流檢測電路30，因此開關調節器300可進一步削減消耗電流。
圖4是表示輕負載模式時的節點SW的電壓與計時器電 路的輸出信號的時序圖。
計時器電路15在功率FET2導通的時機T1開始計數，並以規定的時間(T2-T1)計數完畢，輸出成為低位準。
圖5是表示重負載模式時的節點SW的電壓與計時器電路的輸出信號的時序圖。
計時器電路15在功率FET2導通的時機T1開始計數，且在以規定的時間(T2-T1)計數完畢之前被重置，因此未計數完畢，輸出維持高位準。
如以上所說明般，根據本發明的開關調節器，具備計時器電路，在輕負載模式的情況下，藉由計時器電路來削減比較器的動作電流，因此可削減消耗電流而不會犧牲效率。
2‧‧‧功率FET
3‧‧‧電感器
4‧‧‧肖特基二極體
5‧‧‧電容器
6‧‧‧基準電壓電路
7、8‧‧‧反饋電阻
10‧‧‧比較器
11‧‧‧導通時間控制電路
12‧‧‧R-S正反器電路
13‧‧‧輸出控制電路
14‧‧‧驅動器電路
15‧‧‧計時器電路
100‧‧‧開關調節器
IN‧‧‧輸入端子
OUT‧‧‧輸出端子
Q‧‧‧輸出端子
R‧‧‧重置端子
S‧‧‧設置端子
SW‧‧‧節點
VFB‧‧‧反饋電壓
VREF‧‧‧基準電壓

Claims (3)

  1. 一種開關調節器，其特徵在於包括：比較器，對基準電壓與反饋電壓進行比較；導通時間控制電路，控制功率場效電晶體的導通時間；R-S正反器電路，根據所述比較器的信號與所述導通時間控制電路的信號，輸出對所述功率場效電晶體進行控制的信號；以及計時器電路，接受對所述功率場效電晶體進行控制的信號而對規定時間開始進行計數，所述計時器電路開始計數後至經過所述規定時間前，在所述功率場效電晶體導通時重置計數器並再次開始計數，所述計時器電路在開始計數後至經過所述規定時間前未重置所述計數器的情況下，經過所述規定時間後輸出計數完畢信號，所述比較器接受所述計數完畢信號而將動作電流切換為低消耗電流模式。
  2. 如申請專利範圍第1項所述的開關調節器，其中所述比較器包括：第一比較器，以通常的動作電流而驅動；第二比較器，以比所述通常的動作電流小的動作電流而驅動；以及開關電路，將所述第一比較器的輸出端子與所述第二比較器的輸出端子切換而連接至所述R-S正反器電路的輸入端子， 收到所述計數完畢信號後，停止所述第一比較器動作電流的供給，所述開關電路將所述第二比較器的輸出端子連接於所述R-S正反器電路的輸入端子。
  3. 如申請專利範圍第1項所述的開關調節器，其中所述開關調節器為具備反向電流檢測電路的同步整流型，所述反向電流檢測電路接受所述計數完畢信號而停止動作電流的供給。
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