1311700 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種逆向電壓保護 輸"輪出電源之間的電源電晶體，令= ::: :接至-高電壓信號—向電壓所引發::： 【先前技術】 在大多數的電子產品或積體電路的設 :始終是不可或缺的一部分，尤其是 ：；電 式電子產品’例…放機、數位式錄放影=可， =!;其中的電源電路設計-般會採取較為嚴格心 路丰一以避免因突發的電源意外狀況而損害整體電 請簽閱第二圖所示，在電源電路的設計备印， 用到的元件即是電源切換開關，-般是利用；M0S :常使 構成而連接在輸入電源CViN)與輸出電源(v =曰曰曰體 晶體的基體端（咖）一端係必須維持在—相對二_/、中電 準位’因此是與輪人電源（VIN)連接。 仏兩的電壓 +惟在前述架構之下’當逆向電壓一旦產生 電流而損壞到其餘電路。所謂的逆向電壓是漏 源（W的狀態或是輸入電壓（VIN)低於輸出u‘(、'輪入電 位，由於此時輸入至PM0S電晶體基體端非一才土 〇)的準 電壓，因此輸出電源（V。）將產生漏電流經過該 ^的 而回流至輸入電源端，在嚴重的狀況下 心晶體 兒々丨L極有可能 4 1311700 損害輸入電源這-側的其餘 無法正常運作。同理 $ a致子裝置 A X Μ - glI , 子於以難os電晶體構成的電路中， 其基“則必須連接在一相對 : 此條件，則逆向電壓所引 右無滿足 的漏電流同樣會發生。 【發明内容】1311700 IX. Description of the invention: [Technical field of the invention] The present invention relates to a reverse voltage protection transmission " power supply transistor between the power supply, so that =::: is connected to - high voltage signal - to the voltage Trigger::: [Prior Art] In most electronic products or integrated circuit design: always an indispensable part, especially:; electric electronic products 'examples... radio, digital recordings = OK, =!; Among them, the design of the power supply circuit will generally take a stricter approach to avoid damage to the overall power due to unexpected power supply accidents. Please sign the second picture, the design of the power supply circuit is ready for printing. The component is the power switch, generally used; M0S: often connected to the input power CViN) and the output power (v = the base end of the body crystal (coffee) must be maintained at the same time - /, the Chinese power level 'is therefore connected to the wheel power supply (VIN). 电压 Two voltages + only under the aforementioned structure 'When the reverse voltage generates current, it damages the rest of the circuit. The so-called reverse voltage is the drain source ( The state of W or The input voltage (VIN) is lower than the quasi-voltage of the output u' (, 'round-in potential, because the input to the base of the PM0S transistor is not the same), so the output power (V.) will generate leakage current. ^ While returning to the input power terminal, in severe conditions, the heart crystal is very likely to be 4 1311700. Damage to the input power supply. The rest of the side does not work properly. Similarly, the device AA Μ - glI, sub In a circuit composed of a hard-to-os transistor, the base "must be connected in a relative: under this condition, the leakage current that is not satisfied by the reverse voltage is also generated. [Content of the invention]
惩於現有技術之中，阳φ B ^ ^ η %, 口電日日體的基體始終連接在一固 疋電尾準位而有可能引發 u 逆向電麼保護電路以防止漏電流的產生。 以、種 本發明之主要目的在於提供 就以PM0S電晶體構成 m蔓電路， 何變動，可δ，無論輸人/輸出電壓如 了 ㈣該電晶體的基體端至—相對 壓準位，確保該咖電晶體不會有漏電流的產生。 j達成前述目的，本發明之技術手段包含： '源極端連接至電 源輸出端之間； 电 ^山」麼比較電路’係比較前述該輸入電源端及輪出電 源而兩者之電愿準位，據此產生一基 切換信號； 疵及閘極 電曰:基體切換電路，利用前述基體切換信號而控制電源 沪4:之基體’使基體能連接至具有較高電壓的電源輪入 鸲或電源輪出端；及 及灵：開極電位提升開關，係連接於該電源電晶體之間極 」體之間’當逆向„存在時可切換間極連接至基體， 7电源電晶體保持在截止狀態。In the prior art, Yang φ B ^ ^ η %, the base body of the electric day and the solar body is always connected to a solid electric tail level, which may cause u reverse power to protect the circuit to prevent leakage current. The main purpose of the present invention is to provide a m vine circuit with a PM0S transistor, and how it varies, δ, regardless of the input/output voltage, such as (4) the base end of the transistor to the relative pressure level, ensuring The coffee crystal does not have leakage current. To achieve the foregoing objectives, the technical means of the present invention include: 'the source terminal is connected to the output terminal of the power supply; the comparison circuit of the electric mountain is comparing the aforementioned input power terminal and the power source of the wheel and the electric power level of both. According to this, a base switching signal is generated; 疵 and gate electric 曰: a base switching circuit, which uses the aforementioned base switching signal to control the base of the power supply Shanghai 4: enables the base body to be connected to a power supply wheel or power supply having a higher voltage The wheel-out terminal; and the spirit: the open-potential lift switch is connected between the poles of the power supply transistor. When the reverse direction exists, the switchable pole is connected to the base, and the 7-power transistor remains in the off state. .