Power supply Rectifier load characteristics are different
The battery in the engine room (lead-acid battery) is the only source of electricity for the car, from the lights, air-conditioning, sound ... to the electronic ignition devices are provided by the battery power, these cars are used to connect the electrical In the positive and negative terminals of the battery.
These appliances used in the car, such as home appliances are generally "parallel" use, but the load characteristics of each kind of electrical appliances are not the same, these battery-powered Rectifier in the start, the load characteristics will be different from each other Different voltage stabilization results.
In the case of an electronic ignition device, if the engine's engine speed is 3600 RPM, the conversion can be 60RPS, that is, at 3600 RPM speed, the battery must provide 30 times the electronic ignition current per second, in the four-cylinder engine, the battery every Second must provide 120 times the electronic ignition current, at the same time, other electrical appliances such as sound also need power, it will cause the actual sound voltage instability.
In the two basic types of Rectifiers based on high power diodes or thyristors, the high voltage AC power of the grid is converted to DC power by the transformer. Other types of Rectifiers that refer to future (near or far away): choppers, choppers DC / DC converters or current source inverters, based on uncontrollable diode-walled products. Obviously, this latest type of Rectifier technically contains more to develop content, but it can show advantages, for example, it is very small harmonic interference and 1 power factor loaded on the grid.
Rectifier is the direction of the size of the ever-changing AC, into the same direction, the size of the change in the one-way pulse power. And then through the filter circuit, the regulator circuit, the pulsating power into the same size of the DC.
PWM plating Rectifier can not only control the AC / DC converter performance, but also can achieve the network side of the unit power factor and sine wave current control, and even make two-way power transmission , it is widely used in power factor compensation, high performance Rectifier, Feedback, active filtering and other fields. The input of the electroplated Rectifier is from the three-phase power supply of the grid. The phase sequence a, b, c is only a relative amount under the premise of ensuring the phase difference of 120 °, and the phase sequence of the three-phase power supply in the electroplating Rectifier algorithm involves a large number of mathematical transformations And the output of the PWM wave must be defined at the input. So if the input wiring error, you can not achieve the algorithm function.
Therefore, in a different grid environment, you must first use the instrument to measure the phase sequence, let the Rectifier work, this process cumbersome and prone to error. In this paper, a new three-phase power supply phase sequence adjustment method is proposed to solve the above problems effectively.
In the electronic circuit, we will use the Rectifier! Rectifier is a Rectifier device, simply that is the exchange of DC into the device, it has two main functions, the application of the surface is also very wide! In the current conversion process , We have an important role! Here, we together with the electrical engineering network experts together to see the Rectifier is mainly used in what aspects!
The rectifying device is used to provide the voltage for the fixed polarity required for welding. The output current of this circuit sometimes needs to be controlled. At this time, the diode in the bridge Rectifier is replaced by a thyristor (a thyristor), and the voltage output is adjusted by the phase control trigger. The same time as
The main application of the Rectifier is to convert the AC power to DC power supply. Because all electronic devices need to use DC, but the power company's power supply is AC, so unless the use of batteries, or all electronic devices within the power supply are less than the Rectifier. The same time as
As for the DC power supply voltage conversion is much more complex. One way to convert DC-DC conversion is to first convert the power supply to AC (using a device called an anti-converter), then use the transformer to change the AC voltage and finally rectify it back to the DC power supply.