LL42-GS18

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The LL42-GS18 application field and working principle of a single diode rectifier can be best illustrated by considering a simple circuit, depicted in Figure 1.

In the circuit of Figure 1, two power diodes connected in parallel act as a voltage doubler. When the input voltage Vi is greater than the output voltage of the first diode (Vd1), current will flow from the source (Vi) through the upper diode (D1) and into the capacitor C. The return current will flow out of the capacitor and through the lower diode (D2), thus forming a complete loop.

The resulting output voltage Vout is equal to twice the voltage of diode D2, that is, Vout = 2Vd2. The need for a voltage doubler arises whenever it is desirable to achieve a higher output voltage from the source than that provided directly by the source.

The two power diodes in parallel also act as a current doubler. When the input voltage Vi is greater than the output voltage of diode D2, current will flow from the source (Vi) through both the upper diode (D1) and the lower diode (D2), thus forming a complete loop. The resulting output current is equal to the sum of the currents through the two diodes, that is, Iout = Id1 + Id2.

The working principle of a single diode rectifier can also be applied to a common three-phase rectifier. The three-phase rectifier uses three single-phase inverters. These inverters, in turn, use three power diodes connected in series, as illustrated in Figure 2.

Figure 2: Three-phase rectifier

The three-phase rectifier can be modeled as two full-wave rectifiers connected in parallel, as illustrated in Figure 3.

Figure 3: Model of two full-wave rectifiers

In this circuit, each of the three power diodes acts as a single-phase rectifier, and the output current is equal to the sum of the currents through the three diodes, that is, Iout = I1 + I2 + I3.

The LL42-GS18 application field and working principle of a single diode rectifier can be used to construct rectifiers operating in a wide range of applications, including low-frequency rectifiers, DC-DC converters, and AC-DC transformers. A single diode rectifier is a simple and reliable device, and is widely used in a variety of consumer, commercial, and industrial applications.

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