source:power adapter Popular:adapter release time:2021-10-15 09:45:34 Article author:sznbone
Power adapter rectification technology
1. Constant power rectifier technology
Constant power rectifier, its outstanding feature is that it can provide constant power within the specified AC input voltage and DC output voltage range? This new intelligent high-frequency power adapter system with constant power design is a leap in the concept of power adapters , Is also the best choice for modern power adapter equipment?
In ordinary current-limiting rectifiers, its output characteristics can be divided into two categories, namely constant current and constant voltage characteristics. In constant-current ordinary current-limiting rectifiers, the output current remains unchanged; in constant-voltage ordinary current-limiting rectifiers In the constant current ordinary current-limiting rectifier, if the load current exceeds the current limit value, the output voltage of the rectifier will drop rapidly as the current increases, until the rectifier is over-current and shuts down? Its rated current? Limit current and overcurrent value are very close
The difference between a constant power rectifier and a current limiting rectifier is that a constant power stage is inserted between the constant voltage and constant current stages. This is the so-called constant power rectifier. The rectifier works in three different output stages, namely constant voltage? Constant power and constant current stages? The working conditions of constant voltage and constant current stages are exactly the same as those of current-limiting rectifiers. The difference is that in the constant power stage, the output power of the rectifier remains the same? For example, the output voltage of the constant power rectifier can be from 60V As the current increases, it linearly decreases to 43V. At this time, the system is still in normal working condition. Therefore, a power adapter system designed with a constant power rectifier generally only needs to consider the maximum load of the electronic equipment and the redundancy of the rectifier. Can the rated output power of the power system be determined? Compared with the current-limiting power adapter system, the required rectifier power and the number of rectifier modules can be reduced by at least 33%, which greatly saves investment?
2, current doubler rectifier technology
Usually the DC/DC converter is a full-bridge power converter, and full-wave rectification technology is often used in the secondary of the high-frequency transformer? Therefore, in the ordinary rectifier, the secondary winding of the high-frequency transformer must have a center tap and be in line with the circuit reference voltage (Ground) connected? The center tap divides the secondary winding of the high-frequency transformer into two inductors?
The current doubler rectifier consists of a secondary winding of a high-frequency transformer without a center tap? Two inductors with equal inductance and the same winding on the same core? Two rectifier diodes and an output capacitor?
The most prominent feature of the current doubler rectifier is that the secondary winding of the high-frequency transformer does not have a center tap, and the current flowing through the transformer coil and filter inductor is only half of the output load current? Therefore, the structure of the high-frequency transformer and filter inductor is greatly simplified Design? But need to add a filter inductor in the circuit? The total inductance of the two filter inductors can be equal to or slightly smaller than the inductance value of the choke coil of the ordinary full-wave rectifier, because the operating frequency of the current flowing through the two filter inductors And the speed of change is low? The output current of the current doubler rectifier is the sum of the currents of the two filter inductors, and the pulsating currents of the two filter inductors are canceled. Therefore, the DC output pulsating current is also lower?
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