Direct current to alternating current method, diode rectification

You can't think of electrons as too materialistic, they just don't accumulate there, and inversion isn't simply the result of electrons running in the opposite direction. However, it is generally compared to water and water pipes, when the mouth of the pipe is blocked, the water cannot flow, but it does not accumulate at the cut-off. The water pipe and the shut-off valve do not leak because it can withstand this water pressure, just like the pressure of the diode, otherwise it will burst.

That's the second question you ask, and the summary is that you can't be too idealistic.

The first question is the key, and you just understand it. Take a look at the connection below, what you said about "efficiency" is the problem of the rectification method, bridge rectification, full-wave rectification, half-wave rectification, you will understand after reading these three methods.

DC to AC to use the inverter, there is a triode, the circuit design requirements are one of the tubes to the other tube cut-off and keep converting, it becomes AC, similar to the push change amplifier.

When the forward conduction is on, there are electrons flowing through the diode, so that there is an electric current in the loop. When the reverse cut-off, there is no current in the loop, and of course there is no accumulation of electrons.

The function of the rectifier circuit is to convert the alternating current with a lower voltage output by the AC step-down circuit into a one-way pulsating direct current, which is the rectification process of alternating current, and the rectifier circuit is mainly composed of rectifier diodes. The voltage after the rectifier circuit is no longer AC voltage, but a hybrid voltage containing DC voltage and AC voltage. It is customary to call one-way pulsating DC voltage.

Where direct current is needed, it must be changed to direct current.

The rectifier circuit takes advantage of the unidirectional conductivity of the diode. Unidirectional conductivity is the most important characteristic of diodes. The use of unidirectional conductivity can judge the quality of the diode belt tube, the resistance value of the small sail rolls quietly when the positive deviation, the resistance value is large when the reverse deviation, and the diode is damaged when the residual state is not in the negative state.

A rectifier circuit is a circuit that converts alternating current energy into direct current energy. Most rectifier circuits consist of transformers, rectifier main circuits, and filters, among others. It is widely used in the speed regulation of DC motors, the excitation adjustment of generators, electrolysis, electroplating and other fields.

It is generally used in DC circuits for three purposes:

1. It is used to prevent current backfilling.

2. It plays a protective role to prevent the wrong positive and negative electrodes.

3. It can play a role in lowering blood pressure. Silicon rectifier diodes have about a voltage drop of about one each.

Rectifier diodes take advantage of the unidirectional conductivity of the PN junction to convert alternating current into pulsating direct current. The leakage current of the rectifier diode is large, and most of the diodes are modified and packaged with the ridge of the surface contact material. The shape of the rectifier diode is shown in Figure 3.

In addition, the parameters of the rectifier diode also include the maximum rectifier current, which refers to the maximum current that the rectifier diode can tolerate for a long time. It is the main parameter of the rectifier diode, and it is the main basis for the selection of the rectifier diode. Rectifier circuits take advantage of the unidirectional conductivity of diodes.

Unidirectional conduction is the most important characteristic of a diode. Unidirectional conduction can be used to determine the quality of a diode. The resistance value is small when the forward bias is positive, and the resistance value is large when the reverse bias is reversed, otherwise the diode will be damaged.

A rectifier circuit is a circuit that converts AC power into DC power. Most rectifier circuits consist of a transformer, a main rectifier circuit, and a filter. It is widely used in DC motor speed regulation, generator excitation regulation, electrolysis, electroplating and other fields.

A rectifier is an electronic device that can rectify three-phase alternating current into direct current. The basic principle of the rectifier is to obtain two direct currents by rectifying the positive and negative half waves of the three-phase alternating current respectively, and then bridge the two direct currents through semiconductor devices (such as diodes, transistors, etc.) to obtain the final direct current.

The following is the bridge connection circuit of the rectifier:

The three-phase alternating current in the figure is bridged through the semiconductor device of the rectifier, and the resulting direct current is DC.

In the bridge connection circuit of the rectifier, the positive half-wave of the alternating current is rectified by D1 and D3 to obtain positive direct current, and the negative half-wave is rectified by D2 and D4 to obtain reverse direct current. Then, the forward direct current and the reverse direct current are bridged through D5 and D6 to obtain the final DC DC.

The bridge connection circuit of the rectifier can rectify the three-phase alternating current to direct current, but since the direct current is not regulated, the voltage of the direct current fluctuates depending on the load. In order to stabilize the voltage of the direct current, it is usually necessary to set up a regulated power supply behind the rectifier to ensure the voltage stability of the direct current.

The principle of a regulated power supply is to control the output voltage by adjusting the current of the load, so that the output voltage remains stable. There are two commonly used regulated power supplies: feedback power supply and non-feedback power supply.

The feedback power supply keeps the output voltage stable by comparing it with the set voltage and adjusting the current of the load based on the comparison results. The advantage of the feedback power supply is that the output voltage is stable, but the structure is more complex and the production cost is higher.

A feedback-free power supply does not control the output voltage by regulating the current of the load, but rather controls the output voltage by regulating the input voltage. The advantages of non-feedback power supply are simple structure and low production cost, but the output voltage is unstable.

Rectifier and regulated power supply is an important part of the power supply system, through the rectifier to rectify the three-phase alternating current to direct current, and then through the stabilized power supply to make the voltage of direct current stable, can provide a stable power supply for electronic equipment, to ensure its normal operation.