Switch rectifier starting control method and device
A rectifier and switch technology, which is applied in the field of start-up control methods and devices of switching rectifiers
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Embodiment 1
[0083] The LLC resonant DC / DC converter has the following characteristics: (1) Since the resonant element works in a sinusoidal resonance state, the voltage on the switch tube naturally crosses zero, and the zero-voltage turn-on of the primary side switch tube can be realized within the frequency conversion range and turn off, the power loss is very small; (2) Due to the small loss, the operating frequency can be made relatively high, which can effectively reduce the size and cost of the converter and increase the power density; (3) The secondary side diode is naturally turned off, eliminating The secondary side voltage spike is reduced and the turn-off loss is reduced. Therefore, the LLC resonant converter has outstanding advantages in terms of conversion efficiency and power density, so it is favored by many switching power supply industry personnel. At present, the DC-DC part of the latest communication switching rectifier mostly uses the topology of the LLC resonant conver...
Embodiment 2
[0089] The communication power supply system is generally equipped with oil generators in outdoor base stations, and oil generators of different power levels will be used according to the load conditions. For example, three-phase 10KW oil generators are often used in small outdoor base stations. The problem with this kind of oil generator is that when its three-phase load is unbalanced, the AC input voltage of one or two phases with less load will become very high, so that the rectifier powered by it will trigger protection due to input overvoltage. Therefore, the three-phase engine is required to be able to balance the load among its three phases. This requires that the rectifiers carried between the three phases can be load-balanced. However, during the start-up process of the oil generator with rectifier, due to the differences between the hardware, it is difficult to ensure that the rectifiers of the three phases of the oil generator can start at the same time and keep the...
Embodiment 3
[0095] At present, the market requires that the switching rectifier can work normally under low temperature conditions, or after a period of storage at low temperature, it can be directly turned on and started with full load. . However, the performance of some devices in the switching rectifier will drop sharply under low temperature conditions, which will cause the switching rectifier to fail to start normally with full load. Usually, it will trigger some protection actions inside the rectifier, making the soft start fail.
[0096] The soft start of the switching rectifier with full load can be successfully completed by modifying the soft start strategy. By setting the current soft-start and voltage soft-start curves reasonably, the switching rectifier can change the soft-start strategy according to the ambient temperature, and successfully complete the soft-start with full load on the premise of ensuring that some protection actions inside the rectifier are not triggered. ...
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