forward bias

简明释义

正向偏置

英英释义

例句

1.Applying a forward bias (正向偏置) to the LED allows it to emit light.

对LED施加forward bias（正向偏置）使其发光。

2.In a diode, the current flows easily when there is a forward bias (正向偏置).

在二极管中，当存在一个forward bias（正向偏置）时，电流会很容易流动。

3.The forward bias (正向偏置) helps in reducing the barrier potential in semiconductor devices.

在半导体器件中，forward bias（正向偏置）有助于降低势垒电位。

4.When the voltage exceeds the threshold, the transistor enters a forward bias (正向偏置) state.

当电压超过阈值时，晶体管进入forward bias（正向偏置）状态。

5.A forward bias (正向偏置) condition is essential for the operation of solar cells.

对于太阳能电池的工作，forward bias（正向偏置）条件是必不可少的。

作文

In the realm of electronics and semiconductor physics, the concept of forward bias plays a crucial role in the functionality of diodes and transistors. To understand this term better, we must first delve into the basic principles of how these components operate. A diode, for instance, is a semiconductor device that allows current to flow in one direction while blocking it in the opposite direction. This unidirectional flow is primarily achieved through the application of forward bias (正向偏置), which occurs when the positive terminal of a voltage source is connected to the anode and the negative terminal to the cathode of the diode.When a diode is subjected to forward bias, it reduces the potential barrier at the junction of the p-type and n-type materials within the diode. This reduction in barrier enables charge carriers—holes from the p-side and electrons from the n-side—to recombine more easily, resulting in a significant increase in current flow. The relationship between the applied voltage and the resulting current is not linear; rather, it follows an exponential curve, illustrating how sensitive a diode can be to changes in voltage under forward bias conditions.The practical applications of forward bias are vast and varied. For example, in rectifiers, which convert alternating current (AC) to direct current (DC), diodes are utilized in forward bias mode to allow current to pass through during the positive half-cycle of the AC waveform while blocking it during the negative half-cycle. This property is essential for power supplies and various electronic devices that require stable DC voltages.Furthermore, forward bias is not limited to diodes; it is also fundamental in the operation of bipolar junction transistors (BJTs). In BJTs, the base-emitter junction is typically forward-biased to allow current to flow from the emitter to the collector. This action amplifies the input signal, making BJTs vital components in amplification circuits and switches. The ability to control the flow of current through forward bias is what makes these devices so valuable in modern electronics.However, it's important to note that while forward bias enhances conductivity, excessive forward voltage can lead to thermal runaway or damage to the semiconductor material. Therefore, engineers must carefully design circuits to ensure that the operating conditions remain within safe limits.In conclusion, the concept of forward bias (正向偏置) is integral to understanding the behavior of diodes and transistors within electronic circuits. It facilitates the controlled flow of current, enabling a myriad of applications that form the backbone of modern electronics. Without the principle of forward bias, many of the devices we rely on today would not function effectively, highlighting its importance in both theoretical and practical aspects of electrical engineering.

在电子和半导体物理领域，forward bias（正向偏置）的概念在二极管和晶体管的功能中起着至关重要的作用。要更好地理解这个术语，我们首先必须深入了解这些组件的基本原理。例如，二极管是一种半导体器件，它允许电流单向流动，同时阻止其反向流动。这种单向流动主要通过施加forward bias（正向偏置）来实现，即将电压源的正极连接到二极管的阳极，负极连接到阴极。当二极管受到forward bias时，它减少了二极管内p型和n型材料交界处的势垒。这种势垒的降低使得电荷载流子——来自p侧的孔和来自n侧的电子——更容易复合，从而导致电流流动显著增加。施加电压与产生的电流之间的关系并不是线性的；相反，它遵循指数曲线，说明在forward bias条件下二极管对电压变化的敏感性。forward bias的实际应用广泛而多样。例如，在整流器中，将交流电（AC）转换为直流电（DC），在正半周的交流波形中以forward bias模式使用二极管，使电流通过，而在负半周时则阻止电流。这种特性对于需要稳定直流电压的电源和各种电子设备至关重要。此外，forward bias不仅限于二极管；它在双极结晶体管（BJT）的操作中也是基础。在BJT中，基极-发射极结通常是正向偏置的，以允许电流从发射极流向集电极。这一过程放大了输入信号，使BJT成为放大电路和开关中的重要组件。通过forward bias控制电流流动的能力使这些器件在现代电子产品中具有如此重要的价值。然而，值得注意的是，尽管forward bias增强了导电性，但过高的正向电压可能会导致热失控或损坏半导体材料。因此，工程师必须仔细设计电路，以确保操作条件保持在安全范围内。总之，forward bias（正向偏置）的概念对于理解电子电路中二极管和晶体管的行为至关重要。它促进了电流的受控流动，使得形成现代电子产品基础的无数应用成为可能。如果没有forward bias原理，我们今天依赖的许多设备将无法有效工作，这突显了它在电气工程理论和实践方面的重要性。