TWI345699B - Power source switching device - Google Patents

1345699 ! 100年04月29日按正替换頁 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種電源切換裝置，尤其涉及一種可於外部 接口電源與内部電池電源之間切換之電源切換裝置。 【先前技術】 [0002] 在電腦領域中，通用串行總線設備（USB設備）由於支持熱 插拔、擴展方便及傳輸速度較快等優點而得到越來越廣 泛應用。例如，USB硬盤、USB光驅、USB軟驅、打印機 及數位相機等多種電子設備使用USB作為輔助電源越來越 普及。對於如數位相機，攝影機，投影儀等一些可檇式 電子產品更需要使用雙電源裝置，此類有USB外設之電子 產品USB之電流驅動能力差異很大。 [0003] 目前，一般採用如圖1所示之雙電源電路100，該雙電源 電路100包括一穩壓二極體D1、一電阻R1及一晶體三極體 Q卜 [0004] 所述晶體三極體Q1之發射極與一個電池電源端10相連， 所述晶體三極體Q1之集電極為所述雙電源電路1 0 0之輸出 端11。所述穩壓二極體D1之正極與一個USB輔助電源端 12相連，所述穩壓二極體D1之正極與所述晶體三極體Q1 之基極相連並經電阻R1接地，所述穩壓二極體D1之負極 連接至所述電源切換電路100之輸出端11。所述輸出端11 為負載供電。 [0005] 假設所述電池電源端10接入之電池電源電壓值為U1，所 述USB輔助電源端12接入之USB輔助電源電壓值為U2。當 所述雙電源電路1 00中使用所述USB輔助電源供電給負載 096120767 表單编號 A0101 第 4 頁/共 21 頁 1003150517-0 1345699 100年04月29日按正替換頁1345699 ! October 29, 100, according to the replacement page, the invention description: [Technical field of the invention] [0001] The present invention relates to a power switching device, and more particularly to switching between an external interface power source and an internal battery power source Power switching device. [Prior Art] [0002] In the field of computers, universal serial bus devices (USB devices) have become more and more widely used due to their advantages of hot plugging, convenient expansion, and fast transmission speed. For example, USB devices such as USB hard drives, USB optical drives, USB floppy drives, printers, and digital cameras are becoming more and more popular using USB as an auxiliary power source. For portable electronic products such as digital cameras, cameras, projectors, etc., it is necessary to use dual power supply devices. The USB drive power of such electronic products with USB peripherals varies greatly. [0003] At present, a dual power supply circuit 100 as shown in FIG. 1 is generally used. The dual power supply circuit 100 includes a voltage stabilizing diode D1, a resistor R1, and a crystal triode Q. The emitter of the polar body Q1 is connected to a battery power terminal 10, and the collector of the crystal triode Q1 is the output terminal 11 of the dual power supply circuit 100. The anode of the voltage regulator diode D1 is connected to a USB auxiliary power supply terminal 12, and the anode of the voltage regulator diode D1 is connected to the base of the crystal triode Q1 and grounded via a resistor R1. The cathode of the voltage diode D1 is connected to the output terminal 11 of the power switching circuit 100. The output 11 supplies power to the load. [0005] It is assumed that the battery power supply voltage value of the battery power supply terminal 10 is U1, and the USB auxiliary power supply voltage value of the USB auxiliary power supply terminal 12 is U2. When the dual power supply circuit 100 is used to supply power to the load 096120767 Form No. A0101 Page 4 of 21 1003150517-0 1345699 On April 29, 100, press the replacement page

時，所述穩壓二極體D1於所述USB輔助電源12之作用下導 通，此時所述晶體三極體Q1截止，所述雙電源電路100之 負載於所述USB輔助電源12之作用下工作。然而，當所述 雙電源電路100於所述USB輔助電源12供電給負載之工作 過程中，由於負載之變化或者電壓不穩等原因會出現電 流增大，此時由於所述穩壓二極體D1之穩壓作用，所述 穩壓二極體D1之電壓變化很小。所述晶體三極體Q1無法 立即導通而切換至輔助電源，所述USB輔助電源之電壓值 U2減小而無法滿足電路負載工作時，所述晶體三極體Q1 處於截止狀態而無法及時供電給負載，此時所述雙電源 電路100不能保證負載正常工作甚至所述電池電源及所述 USB輔助電源12被損壞。 [0006] 由以上分析可知，在内部電源與外設電源這種雙電源供 電之情況下，正常情況下外設電源提供給負載穩定之工 作電壓。當電路負載變化，電路中所需要之工作電流也 瞬間增高時，外設電源無法提供工作電流之情況下，如 果不能立即切換至内部電源工作，外設電源容易燒壞， 不能供電給負載正常工作。 【發明内容】 [0007] 有鑒於此，有必要提供一種能於雙電源供電時可以瞬間 切換電源之電源切換裝置。 [0008] 一種電源切換裝置，其包括一選擇單元，一檢測單元與 所述選擇單元相連》—第一電壓源分別與所述檢測單元 及所述選擇單元相連，一第二電壓源與所述選擇單元相 連。所述檢測單元用於判斷所述第一電壓源是否可用， 096120767 表單編號A0101 第5頁/共21頁 1003150517-0 1345699 100年04月29日核正 所述選擇單元狀接收所述_單元之判斷結果，並根 據該結果選擇所述第一電壓源或所述第二 電壓源輸出 [0009] 相對於先前技術，所述電源切換敦置可崎第—電壓源 與第二電壓源之間切換，保證負載變化或者電壓不穩定 之情況下負載能正常工作，也不會影響所述電源切換裝 置之第一電壓源與第二電壓源。 [0010] 【實施方式】 請參閱圖2，其為本發明第—實施例之電源切換裝置200 ’該電源切換裝置200包括—檢測單元24及—選擇單元3〇 °所述檢測單元24包括一檢測端26與一 選擇單元30包括一第一晶體三極體 極體Q12及一第三晶體三極體q13。 控制端28。所述 、一個第二晶體三 [0011] 所述檢測單之檢測端26與—咖輔助電源端22相連 ’所述檢測單元24之控制端28分別與所述第—晶體三極 體Q11之基極及所述第三晶體三極體Q13之基極相連。 [0012] 所述第-晶體三極體(m之集電極與所述第二晶體三極體 Q12之基極相連’所述第—晶體三極體qu之發射極接地 。所述第二晶體三極魏2之發射極與所述輔助電源 知22相連’所述第__日3體二極體㈣之集電極與所述第三 晶體三極_3之集電極相連並共同連至所述電源切換裝 置200輸出鳊32。所述第二晶體三極體Qig之發射極與一 電池電源端2〇相連。 所述檢測單元24之功能係對所述檢測端26輸人之電壓值 與其内。卩預&之檢測電壓值進行比較，所預設之檢測電 096120767 表單編號Α0101 第6頁/共21頁 1003150517-0 [0013] 1100年04月Z9日核正 喳之^取根據工作電路來確定。當檢測端26輸入之電壓 值大於檢剩電壓值時，所述檢測單元24之控制端28之輸 出訊號為阿電平’當檢測端26輸入之電壓值小於檢測電 壓值時’所述檢測單元24之控制端28之輸出訊號為低電 + &述檢測單元24可以為比較器，或者其他具有比較 功能之電路或者元件。 [0014] 入When the voltage regulator diode D1 is turned on by the USB auxiliary power source 12, the crystal triode Q1 is turned off, and the dual power supply circuit 100 is loaded by the USB auxiliary power source 12. Work under. However, when the dual power supply circuit 100 is in the process of supplying power to the load of the USB auxiliary power supply 12, an increase in current may occur due to a change in load or a voltage instability, etc., due to the regulated diode. The voltage regulation of D1, the voltage change of the voltage stabilizing diode D1 is small. The crystal triode Q1 cannot be turned on immediately to switch to the auxiliary power source. When the voltage value U2 of the USB auxiliary power source is reduced to meet the circuit load operation, the crystal triode Q1 is in an off state and cannot be powered in time. The load, at this time, the dual power supply circuit 100 cannot guarantee that the load is working normally, even if the battery power source and the USB auxiliary power source 12 are damaged. [0006] From the above analysis, in the case of dual power supply of internal power supply and peripheral power supply, the peripheral power supply normally supplies a stable working voltage to the load. When the load of the circuit changes and the working current required in the circuit also increases instantaneously, if the peripheral power supply cannot provide the working current, if the internal power supply cannot be switched immediately, the peripheral power supply is easily burned out, and the power supply cannot be supplied to the load. . SUMMARY OF THE INVENTION [0007] In view of the above, it is necessary to provide a power switching device that can instantaneously switch power when dual power is supplied. [0008] A power switching device includes a selection unit, a detection unit is connected to the selection unit ” a first voltage source is respectively connected to the detection unit and the selection unit, and a second voltage source is The selection unit is connected. The detecting unit is configured to determine whether the first voltage source is available, 096120767 Form No. A0101, page 5 / 21 pages, 1003150517-0 1345699, April 29, 100, verifying that the selected unit receives the unit Determining a result, and selecting the first voltage source or the second voltage source output according to the result. [0009] Compared with the prior art, the power switching switch between the voltage source and the second voltage source The load can work normally under the condition that the load is changed or the voltage is unstable, and the first voltage source and the second voltage source of the power switching device are not affected. [Embodiment] Please refer to FIG. 2, which is a power switching device 200 according to a first embodiment of the present invention. The power switching device 200 includes a detecting unit 24 and a selecting unit. The detecting unit 24 includes a detecting unit 24. The detecting end 26 and a selecting unit 30 include a first crystal triode body Q12 and a third crystal triode q13. Control terminal 28. The second crystal transistor is connected to the control terminal 28 of the detecting unit 24 and the base of the third crystal transistor Q11, respectively. The poles are connected to the base of the third crystal triode Q13. [0012] the first crystal transistor (the collector of m is connected to the base of the second crystal triode Q12), the emitter of the first crystal triode qu is grounded. The second crystal The emitter of the triode Wei 2 is connected to the auxiliary power source 22. The collector of the third body diode (4) of the first __ day is connected to the collector of the third crystal transistor _3 and is connected to the same The power switching device 200 outputs a buffer 32. The emitter of the second crystal triode Qig is connected to a battery power terminal 2〇. The function of the detecting unit 24 is to input a voltage value to the detecting terminal 26卩Pre-amplitude detection voltage value is compared, the preset detection power 096120767 Form number Α0101 Page 6 / Total 21 page 1003150517-0 [0013] 1100 April Z9 nuclear check-up ^ according to work The circuit determines that when the voltage value input by the detecting terminal 26 is greater than the residual voltage value, the output signal of the control terminal 28 of the detecting unit 24 is an A level 'When the voltage value input by the detecting terminal 26 is less than the detected voltage value' The output signal of the control terminal 28 of the detecting unit 24 is low power + & Think of a comparator, or other circuit or component with a comparison function. [0014]

[0015] 心衔測單元24對所述USB輔助電源端22輸 之電壓值進行划i J巧斷。當所述USB辅助電源之電壓值大於 所述檢測單元24 <檢測電壓值時，所述檢測單元24之控 制端28之輸出為高電平訊號 ，此時所述USB輔助電源之電 壓值可以滿足外部备共 1貝載之需要。此時所述第一晶體三極 體Q11導通，所述坌a <弟一晶體三極體Q11之導通控制所述第 二晶體三極體q12遂、a 等通°所述控制端28之輸出為高電平訊 號時所述第三晶微λ 15二極體Q13截止，此時所述電源切換裝 置200之輸出為所述咖輔助電源之電壓 ，即所述USB輔 助電源工作而所料池電源不工作。 所述USB輔助電琢工作時，由於負載之變化或者電壓不穩 等原a μ述電源切換裝置㈣之電流升高，所述㈣輔 助電源it $ 下降直至所述膽輔助電源之電壓值無法 滿足外βΡ貞載之需要°此時所述USB輔助電源之電壓值小 於所述m單元24之檢測電壓值，所述檢測單元24之控 電平訊號並控制所述第—晶體三極體 QU截止~~晶體三極體Q11之截止控制所述第二 。所述控制28之輸出為低電平訊號 時控制所述第~~晶體三極體Q13導通。此時所述電源切換 096120767 表單编技A〇101 第7頁/共21頁 1003150517-0 1345699 __ 100年04月29日修正替换頁 裝置200之輸出為所述電池電源之電壓，即所述電池電源 工作而所述USB輔助電源不工作。 [0016] 所述電池電源工作時，由於負載之變化或者電壓不穩等 原因，所述電源切換裝置200之電流降低，所述USB輔助 電源之電壓值升高直至所述檢測單元24之控制端28之輸 出為高電平訊號，所述檢測單元24判斷所述USB辅助電源 可滿足負載工作。此時所述檢測單元24之控制端28輸出 之高電平訊號控制所述第一晶體三極體Q11導通，所述第 一晶體三極體Q11之導通控制所述第二晶體三極體Q1 2導 | 通。所述控制端28之輸出為高電平訊號時控制所述第三 晶體三極體Q13截止。此時所述電源切換裝置200之輸出 為所述USB輔助電源，即所述USB輔助電源工作而所述電 池電源不工作。 [0017] 可以理解，所述第三晶體三極體Q13之基極同時還可通過 一電阻接地，從而可通過調節電阻之值來調整所述第三 晶體三極體Q13之基極電壓，增強所述電源切換裝置200 之靈活性。 _ [0018] 可以理解，所述第二晶體三極體Q12之發射極還可通過一 電容與電感並聯之電路與其基極相連，可以對所述電源 切換裝置200之切換工作起緩衝作用。 [0019] 可以理解，所述晶體三極體Qll、Q12、Q13可以為電晶 體-電晶體邏輯電路器件或互補金屬氧化物半導體器件等 具有開關功能之電子元件及電路。[0015] The heart rate measuring unit 24 performs a smoothing on the voltage value input by the USB auxiliary power source terminal 22. When the voltage value of the USB auxiliary power source is greater than the detection unit 24 < detection voltage value, the output of the control terminal 28 of the detecting unit 24 is a high level signal, and the voltage value of the USB auxiliary power source may be Meet the needs of the external preparation for a total of 1 Bei. At this time, the first crystal triode Q11 is turned on, and the conduction of the 坌a < 一-crystal triode Q11 controls the second crystal triode q12 遂, a, etc., the control terminal 28 When the output is a high level signal, the third crystal micro λ 15 diode Q13 is turned off. At this time, the output of the power switching device 200 is the voltage of the coffee auxiliary power supply, that is, the USB auxiliary power supply works. The pool power does not work. When the USB auxiliary power is operated, the current of the power supply switching device (4) is increased due to a change in load or a voltage instability, and the (four) auxiliary power supply it$ is lowered until the voltage value of the auxiliary power supply cannot be satisfied. The voltage of the USB auxiliary power supply is lower than the detection voltage value of the m unit 24, the control level signal of the detecting unit 24 controls the cut-off of the first crystal triode QU. ~~ The cutoff of the crystal triode Q11 controls the second. When the output of the control 28 is a low level signal, the first to third transistor Q13 is controlled to be turned on. At this time, the power switch 096120767 Form Composer A 〇 101 Page 7 / 21 pages 1003150517-0 1345699 __ On April 29, 100, the output of the replacement page device 200 is corrected to the voltage of the battery power source, that is, the battery The power supply is working and the USB auxiliary power supply is not working. [0016] When the battery power source is working, the current of the power switching device 200 decreases due to a change in load or voltage instability, and the voltage value of the USB auxiliary power source rises until the control end of the detecting unit 24 The output of 28 is a high level signal, and the detecting unit 24 determines that the USB auxiliary power source can satisfy the load operation. At this time, the high level signal outputted by the control terminal 28 of the detecting unit 24 controls the first crystal triode Q11 to be turned on, and the conduction of the first crystal triode Q11 controls the second crystal triode Q1. 2 guide | pass. When the output of the control terminal 28 is a high level signal, the third crystal triode Q13 is controlled to be turned off. At this time, the output of the power switching device 200 is the USB auxiliary power source, that is, the USB auxiliary power source operates and the battery power source does not operate. [0017] It can be understood that the base of the third crystal triode Q13 can also be grounded through a resistor at the same time, so that the base voltage of the third crystal triode Q13 can be adjusted by adjusting the value of the resistor, and the base voltage is increased. The flexibility of the power switching device 200. [0018] It can be understood that the emitter of the second crystal transistor Q12 can also be connected to its base through a circuit in which a capacitor and an inductor are connected in parallel, which can buffer the switching operation of the power switching device 200. [0019] It is to be understood that the crystal triodes Q11, Q12, and Q13 may be electronic components and circuits having a switching function such as an electro-optical-transistor logic circuit device or a complementary metal oxide semiconductor device.

[0020] 本實施例之電源切換裝置200於所述電池電源與所述USB 096120767 表單編號A0101 第8頁/共21頁 1003150517-0 100年04月29日核正替換頁 1345699 輔助電源之間進行切換供電至負載，保證所述電源切換 裝置200由於負載之影響或者電壓不穩定之情況下負載正 常工作，同時不影響所述電池電源與所述USB輔助電源。 [0021] 請參閱圖3，其為本發明第二實施例之電源切換裝置300 ，該電源切換裝置300包括一檢測單元45及一選擇單元60 〇 [0022] 所述檢測單元45包括一檢測端46與一輸出端48。所述選 擇單元60包括一微控制器50、一邏輯與門54、一第一電 • 阻R2、一第二電阻R3、一第一晶體三極體Q21、一第二晶 體三極體Q22及一第三晶體三極體Q23。所述邏輯與門54 包括一第一二極體D3及一第二二極體D4。所述微控制器 50具有一輸入端53、一第一控制端51及一第二控制端52 [0023] 所述檢測單元45之檢測端46與一USB輔助電源端42相連 ，所述檢測單元45之輸出端48分別連至所述第一二極體 D3之正極及所述微控制器50之輸入端53。所述第一電阻 R2之兩端分別連至所述第一二極體D3之負極與所述第一 晶體三極體Q21之基極，所述第二電阻R3之兩端分別連至 所述第一晶體三極體Q21之基極及發射極，所述第一晶體 三極體Q21之發射極接地。所述第一晶體三極體Q21之集 電極與所述第二晶體三極體Q22之基極相連，所述第二晶 體三極體Q22之發射極與所述USB輔助電源端42相連。 [0024] 所述微控制器50之第一控制端51與所述第二二極體D4之 負極相連，所述第二二極體D4之正極與所述第一二極體 096120767 表單編號A0101 第9頁/共21頁 1003150517-0 1345699[0020] The power switching device 200 of the embodiment is performed between the battery power source and the USB 096120767 Form No. A0101, page 8 of 21, 1003150517-0, April 29, 1999, nuclear replacement page 1345699 auxiliary power supply. Switching the power supply to the load ensures that the power switching device 200 operates normally due to the influence of the load or the voltage is unstable, and does not affect the battery power and the USB auxiliary power. [0021] Please refer to FIG. 3, which is a power switching device 300 according to a second embodiment of the present invention. The power switching device 300 includes a detecting unit 45 and a selecting unit 60. [0022] The detecting unit 45 includes a detecting end. 46 and an output 48. The selection unit 60 includes a microcontroller 50, a logic AND gate 54, a first resistor R2, a second resistor R3, a first crystal triode Q21, and a second crystal triode Q22. A third crystal triode Q23. The logic AND gate 54 includes a first diode D3 and a second diode D4. The microcontroller 50 has an input terminal 53 , a first control terminal 51 and a second control terminal 52 . The detection terminal 46 of the detection unit 45 is connected to a USB auxiliary power terminal 42 . The output terminal 48 of the 45 is connected to the anode of the first diode D3 and the input terminal 53 of the microcontroller 50, respectively. The two ends of the first resistor R2 are respectively connected to the anode of the first diode D3 and the base of the first crystal transistor Q21, and the two ends of the second resistor R3 are respectively connected to the The base and the emitter of the first crystal triode Q21, and the emitter of the first crystal triode Q21 is grounded. The collector of the first crystal triode Q21 is connected to the base of the second crystal triode Q22, and the emitter of the second crystal triode Q22 is connected to the USB auxiliary power terminal 42. [0024] The first control end 51 of the microcontroller 50 is connected to the negative pole of the second diode D4, the anode of the second diode D4 and the first diode 096120767 Form No. A0101 Page 9 of 21 page 1003150517-0 1345699

所述微控制器50 D3之負極相連並一同連至第一電阻R2 之第二控制端52與所述第三晶體三極體q23之基極相連。 所述第二晶體二極體Q23之發射極與一電池電源端相連 ，所述第三晶體三極體Q23之集電極與所述第二晶體三極 體Q22之集電極相連並共同連至所述電源切換裝置3〇〇之 輸出端70。 [0025] 所述檢測單元45之功能與本發明第一實施例中之檢測單 元24功能及原理相同。所述微控制器5〇之功能係當輸入 端53之輸入為高電平訊號時，所述第一控制端51及第二 控制端52之輸出均為高電平訊號。此後如果所述微控制 器50之輸入端53之輪入為低電平訊號時，所述第一控制 端51及第二控制端52之訊號均跳變為低電平訊號。跳變 一次後，所述微控制器50之第一控制端51及一個第二控 制端52之輸出均一直為低電平訊號，直到有外部控制單 元如CPU等可發出控制訊號之控制裝置，控制所述微控制 器50重新可以開始進行高低電平訊號轉換。 [0026] 當所述USB輔助電源端42輸入之USB輔助電源之電壓值大 於所述檢測單元45内預設之檢測電壓值時，所述檢測單 元45之輸出端48輸出為高電平訊號，所述第一二極體D3 正極之訊號為南電平，所述第 ——— 極體D3導通。此時’ 所述微控制器50之輸入端53為高電平訊號，所述微控制 器50之第一控制端51與第二控制端52之輸出同時為高電 平訊號，所述第二二極體D4負極之訊號為高電平’所述 第二二極體D4截止。此時所述邏輯與門54之輸出為高電 平訊號並控制所述第一晶體三極體Q21導通’所述第一晶 096120767 表單編號A0101 第10頁/共21頁 1003150517-0 1345699 100年04月29日修正替换頁 體三極體Q21之導通控制所述第二晶體三極體Q22導通， 所述USB輔助電源接至所述電源切換裝置300之輸出端70 。所述第二控制端52之輸出訊號為高電平時所述第三晶 體三極體Q23戴止，此時所述電源切換裝置300之輸出為 所述USB輔助電源之電壓，即所述USB輔助電源工作而所 述電池電源端4 0輸入之電池電源不工作。The second control terminal 52 of the microcontroller 50 D3 connected to the negative terminal and connected to the first resistor R2 is connected to the base of the third crystal transistor q23. The emitter of the second crystal diode Q23 is connected to a battery power terminal, and the collector of the third crystal transistor Q23 is connected to the collector of the second crystal transistor Q22 and connected to the same The output terminal 70 of the power switching device 3 is described. [0025] The function of the detecting unit 45 is the same as the function and principle of the detecting unit 24 in the first embodiment of the present invention. The function of the microcontroller 5 is that when the input of the input terminal 53 is a high level signal, the outputs of the first control terminal 51 and the second control terminal 52 are high level signals. Thereafter, if the input of the input terminal 53 of the micro controller 50 is a low level signal, the signals of the first control terminal 51 and the second control terminal 52 all jump to a low level signal. After the transition, the output of the first control terminal 51 and the second control terminal 52 of the microcontroller 50 is always a low level signal until an external control unit such as a CPU can send a control signal to the control signal. Controlling the microcontroller 50 can resume high and low level signal conversion. [0026] When the voltage value of the USB auxiliary power source input by the USB auxiliary power terminal 42 is greater than the preset detection voltage value in the detecting unit 45, the output terminal 48 of the detecting unit 45 outputs a high level signal. The signal of the positive electrode of the first diode D3 is a south level, and the first body D3 is turned on. At this time, the input terminal 53 of the microcontroller 50 is a high level signal, and the outputs of the first control terminal 51 and the second control terminal 52 of the microcontroller 50 are simultaneously a high level signal, and the second The signal of the negative electrode of the diode D4 is high level 'the second diode D4 is turned off. At this time, the output of the logic AND gate 54 is a high level signal and the first crystal transistor Q21 is turned on. The first crystal 096120767 is formed on the form number A0101. Page 10/21 pages 1003150517-0 1345699 100 years On April 29, the conduction of the replacement page body triode Q21 is controlled to turn on the second crystal triode Q22, and the USB auxiliary power source is connected to the output terminal 70 of the power switching device 300. When the output signal of the second control terminal 52 is at a high level, the third crystal triode Q23 is worn. At this time, the output of the power switching device 300 is the voltage of the USB auxiliary power source, that is, the USB auxiliary. The power supply is working and the battery power input of the battery power terminal 40 is not working.

[0027] 所述USB輔助電源工作時，由於負載之變化或者電壓不穩 等原因，所述電源切換裝置30 0之電流升高，所述USB輔 助電源之電壓值下降。當所述USB輔助電源之電壓值下降 直至不能滿足外部負載之需要時，所輸入之USB輔助電源 之電壓值小於所述檢測單元45之檢測電壓值，所述檢測 單元45之控制端48之輸出為低電平訊號，所述第一二極 體D3正極之訊號為低電平，所述第一二極體D3截止。所 述微控制器50之第一控制端51與所述第二控制端52之輸 出同時為低電平訊號，所述第二二極體D4正極與負極之 訊號均為低電平，所述第二二極體D4截止。此時所述邏 輯與門54之輸出為低電平訊號並控制所述第一晶體三極 體Q21截止，所述第一晶體三極體Q21截止同時控制所述 第二晶體三極體Q22截止。所述第二控制端52之輸出訊號 為低電平時控制所述第三晶體三極體Q23導通。所述電池 電源接至所述電源切換裝置300之輸出端70，此時所述電 源切換裝置300之輸出為電池電源之電壓，即所述電池電 源工作而所述USB輔助電源不工作。 [0028] 同第一實施例，當所述電源切換裝置300之電流降低，所 述USB輔助電源之電壓值升高直至大於所述檢測單元4 5之 096120767 表單編號A0101 第11頁/共21頁 1003150517-0 1345699 100年04月29日修正替换頁[0027] When the USB auxiliary power supply is operating, the current of the power switching device 30 0 increases due to a change in load or voltage instability, and the voltage value of the USB auxiliary power supply decreases. When the voltage value of the USB auxiliary power supply drops until the external load is not satisfied, the voltage value of the input USB auxiliary power source is smaller than the detection voltage value of the detecting unit 45, and the output of the control terminal 48 of the detecting unit 45 For the low level signal, the signal of the positive pole of the first diode D3 is a low level, and the first diode D3 is turned off. The outputs of the first control terminal 51 and the second control terminal 52 of the microcontroller 50 are simultaneously a low level signal, and the signals of the positive and negative electrodes of the second diode D4 are both low levels. The second diode D4 is turned off. At this time, the output of the logic AND gate 54 is a low level signal and the first crystal triode Q21 is turned off, the first crystal triode Q21 is turned off and the second crystal triode Q22 is turned off. . When the output signal of the second control terminal 52 is at a low level, the third crystal triode Q23 is controlled to be turned on. The battery power source is connected to the output terminal 70 of the power switching device 300. At this time, the output of the power switching device 300 is the voltage of the battery power source, that is, the battery power source operates and the USB auxiliary power source does not work. [0028] With the first embodiment, when the current of the power switching device 300 is lowered, the voltage value of the USB auxiliary power source is increased until it is greater than the 096120767 of the detecting unit 45. Form No. A0101 Page 11 of 21 1003150517-0 1345699 Correction replacement page on April 29, 100

檢測電壓值時，所述USB輔助電源可滿足外部負載工作。 所述檢測單元45之控制端48之輸出為高電平訊號，所述 第一二極體D3之正極訊號為高電平，所述第一二極體D3 導通。所述微控制器50之輸入端53之輸入為高電平訊號 ，此時所述微控制器50之第一控制端51與所述第二控制 端52輸出之同時繼續為低電平訊號，所述第二二極體D4 之負極訊號為低電平，其正極訊號為高電平，所述第一 二極體D3與所述第二二極體D4均導通，電流經D3流至D4 。此時所述邏輯與門54之輸出訊號仍然為低電平並控制 所述第一晶體三極體Q21截止，所述第一晶體三極體Q21 之截止控制所述第二晶體三極體Q22截止。所述第二控制 端52之輸出為低電平訊號時控制所述第三晶體三極體Q23 導通。所述電池電源接至所述電源切換裝置300之輸出端 70，此時所述電源切換裝置300之輸出為所述電池電源之 電壓，即所述電池電源工作而所述USB輔助電源不工作。 直至有外部控制單元如CPU等可發出控制訊號之控制裝置 ，控制所述微控制器50重新可以開始進行高低電平訊號 轉換，所述電池電源與所述USB輔助電源可重新進行切換 [0029] 可以理解，所述第三晶體三極體Q23之基極同時還可通過 一電阻接地，從而可通過調節電阻之值來調整所述第三 晶體三極體Q23之基極電壓，增強所述電源切換裝置300 之靈活性。 [0030] 可以理解，所述第二晶體三極體Q22之發射極還可通過一 電容與電感並聯之電路與其基極相連，可以對所述電源 096120767 表單編號A0101 第12頁/共21頁 1003150517-0 U45699 [0031] [0032] [0033] 100年04月29日核正替換頁 刀換裝置3GG之切換王作起到缓衝作用。 理解’所述晶體三極體Q21、Q22、Q23可以為電晶 體-電晶體邏輯電路器件或互補金屬氧化物半導體器件等 具有開關功能之電子元件及電路。 可以理解，所述邏輯與門54可以為二極體、晶體三極體 或互補金屬氧化物半導體。When the voltage value is detected, the USB auxiliary power supply can work for an external load. The output of the control terminal 48 of the detecting unit 45 is a high level signal, the positive signal of the first diode D3 is a high level, and the first diode D3 is turned on. The input of the input terminal 53 of the microcontroller 50 is a high level signal. At this time, the first control terminal 51 of the microcontroller 50 and the output of the second control terminal 52 continue to be a low level signal. The anode signal of the second diode D4 is at a low level, and the positive signal of the second diode D4 is a high level, and the first diode D3 and the second diode D4 are both turned on, and the current flows to the D4 through the D3. . At this time, the output signal of the logic AND gate 54 is still low level and the first crystal triode Q21 is controlled to be turned off, and the cutoff of the first crystal triode Q21 controls the second crystal triode Q22. cutoff. When the output of the second control terminal 52 is a low level signal, the third crystal triode Q23 is controlled to be turned on. The battery power source is connected to the output end 70 of the power switching device 300. At this time, the output of the power switching device 300 is the voltage of the battery power source, that is, the battery power source operates and the USB auxiliary power source does not work. Until the external control unit, such as a CPU, can control the control signal, the microcontroller 50 can be controlled to start high and low level signal conversion, and the battery power and the USB auxiliary power can be switched again [0029] It can be understood that the base of the third crystal triode Q23 can also be grounded through a resistor at the same time, so that the base voltage of the third crystal triode Q23 can be adjusted by adjusting the value of the resistor to enhance the power supply. The flexibility of switching device 300. [0030] It can be understood that the emitter of the second crystal transistor Q22 can also be connected to its base through a circuit in which a capacitor and an inductor are connected in parallel, and the power supply can be 096120767. Form number A0101 Page 12 / 21 pages 1003150517 -0 U45699 [0033] [0033] On April 29th, 100th, the replacement of the knife-changing device 3GG was used as a buffering function. It is understood that the crystal triodes Q21, Q22, and Q23 may be electronic components and circuits having a switching function such as an electro-optical-transistor logic circuit device or a complementary metal oxide semiconductor device. It will be appreciated that the AND gate 54 can be a diode, a crystal triode or a complementary metal oxide semiconductor.

衫施狀電㈣換m⑽貞狀f彡響或者電 疋之情況T可料行—切述USB輔助電源與所述電騎 源之間之切換’保證負載正常工作，同時不影響所 池電源及所述USB辅助電源。此外，所述電源切換裝置 3〇0還包括一微控制器5Q，當所述電源切換裝置_實現 -次切換電源後’所述微控㈣5G不再隨著輸人端為古/ 低電平訊號而跳變為高/低電平訊號，—直到所述 助電源穩定後’再通過外部控制器控制所述電源切換裝 置300切換至所述USB輔助電源工作。以保證在某段時^ 内電壓不穩定時，所述電源切換裝置3〇〇不會出現反復^ 變之情況，避免所述電源切換裝置3〇〇之交替切換影響= 至損壞所述電源切換裝置300 » ' [〇〇34] 综上所述，本發明確已符合發明專利之要件，羑依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，本發明之範圍並不以上述實施方式為限，舉凡熟習 本案技藝之人士援依本發明之精神所作之等效修飾戋變 化，皆應涵蓋於以下申請專利範圍内。【圖式簡單說明】 096120767 表單編號A0101 第13頁/共21頁 ^03150517-0 1345699 100年〇4月29日按正替换再 [0035] 圖1為現有之一種電源切換裝置之電路圖。 [0036] 圖2為本發明第一實施例之電源切換裝置之電路圖。 [0037] 圖3為本發明第二實施例之電源切換裝置之電路圖。 【主要元件符號說明】 [0038] 先前技術： [0039] 雙電源電路：100 [0040] 電池電源端：10 [0041] 輸出端：11 [0042] USB輔助電源端：12 [0043] 電阻：R1 [0044] 穩壓二極體：D1 [0045] 晶體三極體：Q1 [0046] 本發明： [0047] 電源切換裝置：200, 300 [0048] 電池電源端：20, 40 [0049] USB輔助電源端：22, 42 [0050] 檢測單元：24, 45 [0051] 檢測端：2 6，4 6 [0052] 控制端：28 [0053] 選擇單元：30 表單編號A0101The shirt is applied (4) for m (10) 贞 彡 f 或者 or 疋 可 T can be expected to describe - switch between the USB auxiliary power supply and the electric riding source to ensure that the load works normally, while not affecting the pool power and The USB auxiliary power supply. In addition, the power switching device 〇0 further includes a microcontroller 5Q. When the power switching device implements-sub-switching power, the micro-control (4) 5G no longer follows the input terminal for the ancient/low level. The signal jumps to a high/low level signal, until the power supply is stabilized, and then the power switching device 300 is controlled to switch to the USB auxiliary power supply by an external controller. In order to ensure that the voltage switching device 3 does not repeatedly change when the voltage is unstable in a certain period of time, the alternating switching effect of the power switching device 3 is prevented from being affected until the power switching is damaged. Device 300 » ' [〇〇34] In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to change the equivalent modifications and modifications according to the spirit of the present invention. It should be covered by the following patent application. [Simple description of the drawing] 096120767 Form No. A0101 Page 13 of 21 ^03150517-0 1345699 100 years 〇 April 29th is replaced by positive [0035] Fig. 1 is a circuit diagram of a conventional power switching device. 2 is a circuit diagram of a power switching device according to a first embodiment of the present invention. 3 is a circuit diagram of a power switching device according to a second embodiment of the present invention. [Main component symbol description] [0038] Prior art: [0039] Dual power supply circuit: 100 [0040] Battery power supply terminal: 10 [0041] Output terminal: 11 [0042] USB auxiliary power supply terminal: 12 [0043] Resistance: R1 [0044] Stabilizing diode: D1 [0045] Crystal triode: Q1 [0046] The present invention: [0047] Power switching device: 200, 300 [0048] Battery power terminal: 20, 40 [0049] USB assist Power supply: 22, 42 [0050] Detection unit: 24, 45 [0051] Detection terminal: 2 6,4 6 [0052] Control terminal: 28 [0053] Selection unit: 30 Form number A0101

096120767 第14頁/共21頁 1003150517-0 1345699096120767 Page 14 of 21 1003150517-0 1345699

[0054] 輸出端：32, 70 [0055] 第一晶體三極體：Q11 [0056] 第二晶體三極體：Q12 [0057] 第三晶體三極體：Q13 [0058] 輸出端：48 [0059] 微控制器：50 [0060] 第一控制端：51 [0061] 第二控制端：52 [0062] 輸入端：53 [0063] 邏輯與門：54 [0064] 選擇單元：60 [0065] 第一電阻：R2 [0066] 第二電阻：R3 [0067] 第一晶體三極體：Q21 [0068] 第二晶體三極體：Q22 [0069] 第三晶體三極體：Q23 [0070] 第一二極體：D3 [0071] 第二二極體：D4 096120767 表單編號A0101 第15頁/共21頁 100年04月29日核正替换頁 1003150517-0[0054] Output: 32, 70 [0055] First crystal triode: Q11 [0056] Second crystal triode: Q12 [0057] Third crystal triode: Q13 [0058] Output: 48 [ 0059] Microcontroller: 50 [0060] First Control Terminal: 51 [0061] Second Control Terminal: 52 [0062] Input: 53 [0063] Logic AND Gate: 54 [0064] Selection Unit: 60 [0065] First resistance: R2 [0066] Second resistance: R3 [0067] First crystal triode: Q21 [0068] Second crystal triode: Q22 [0069] Third crystal triode: Q23 [0070] One diode: D3 [0071] Second diode: D4 096120767 Form number A0101 Page 15 / Total 21 pages 100 years April 29 nuclear replacement page 1003150517-0