電氣工程及其自動化專業(yè)英語第一章課文翻譯-資料下載頁
2025-04-04 01:27本頁面
【正文】 由箭頭標明Independent sources are usually meant to deliver power to the external circuit and not to absorb it. Thus if u is the voltage across the source and its current i is directed out of the positive terminal, then the source is delivering power, given by p = ui, to the external circuit. Otherwise it is absorbing power. For example, in (a) the battery is delivering 24 W to the external circuit. In (b) the battery is absorbing 24 W, as would be the case when it is being charged. 獨立源通常指的是向外電路釋放功率而非吸收功率，因此如果u是電源兩端的電壓而電流i直接從其正端流出，那么該電源正在向?qū)﹄娐丰尫殴β剩墒絧＝ui算出。否則它就在吸收功率。例如圖1－6（a）中電池正在向外電路釋放功率24w，在圖1－6（b）中，電池就在充電情況，吸收功率24w。Dependent sources An ideal dependent (or controlled) source is an active element in which the source quantity is controlled by another voltage or current. Dependent sources are usually designated by diamondshaped symbols, as shown in the control of the dependent source is achieved by a voltage or current of some other element in the circuit, and the source can be voltage or current, it follows that there are four possible types of dependent sources, namely:（1）A voltagecontrolled voltage source (VCVS).（2）A currentcontrolled voltage source (CCVS).（3）A voltagecontrolled current source (VCCS).（4）A currentcontrolled current source (CCCS). Dependent sources are useful in modeling elements such as transistors, operational amplifiers and integrated circuits. 一個理想的受控源是一個有源元件，它的電源量是由另外一個電壓和電流所控制。受控源通常用菱形符號表明，如圖1－7所示。由于控制受控源的控制量來自于電路中其他元件的電壓或電流，同時由于受控源可以是電壓源或電流源。由此可以推出四種可能的受控源類型，即電壓控制電壓源（VCVS）電流控制電壓源（CCVS）電壓控制電流源（VCCS）電流控制電流源（CCCS）受控源在模擬諸如晶體管、運算放大器以及集成電路這些元件時是很有用的It should be noted that an ideal voltage source (dependent or independent) will produce any current required to ensure that the terminal voltage is as stated, whereas an ideal current source will produce the necessary voltage to ensure the stated current flow. Thus an ideal source could in theory supply an infinite amount of energy. It should also be noted that not only do sources supply power to a circuit, but they can absorb power from a circuit too. For a voltage source, we know the voltage but not the current supplied or drawn by it. By the same token, we know the current supplied by a current source but not the voltage across it. 應(yīng)該注意的是：一個理想電壓源（獨立或受控）可向電路提供以保證其端電壓為規(guī)定值所需的任意電流，而電流源可向電路提供以保證其電流為規(guī)定值所必須的電壓。還應(yīng)當注意的是電源不僅向電路提供功率，他們也可從電路吸收功率。對于一個電壓源來說，我們知道的是由其提供或所獲得的電壓而非電流，同理，我們知道電流源所提供的電流而非電流源兩端的電壓。7
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