A soft start device and soft start method for a high-power transmitter

Abstract

The invention discloses a soft start device for a high-power transmitter and a soft start method thereof. The soft start device of the high-power transmitter adopts a programmable industrial controller PLC, a digital-to-analog converter D / A, a soft start control circuit, and a phase-controlled AC module. PLC sets the initial level of soft start control and the digital signal of the rising rate of the control level rise and change. After D / A conversion, it forms an analog control level, and then it is amplified by the soft start control circuit and sent to the corresponding phase. Control the control terminal of the AC module, start conduction according to the set conduction angle, and increase the conduction angle according to the set change rate until it is completely conducted. The present invention has the characteristics of flexible control and wide adaptability, can adjust the initial level of soft start and the rising rate of change, and realizes a stable and reliable soft start process; especially when the soft start process is long or out of control, it will not be as traditional In the soft start circuit, the resistance will burn out due to overheating. The invention also discloses a soft start method of the device.

Description

technical field [0001] The invention relates to a power supply in the field of radar and electronic countermeasures, a transmitter soft start device and a soft start method thereof, in particular to a high-power transmitter soft start device and a soft start method thereof. Background technique [0002] With the increase of radar power, the improvement of electronic countermeasure effect, and the increase of transmitter (or microwave amplifier) ​​power requirements in large scientific projects, the demand for high-power transmitters has been constant. These high-power devices not only require more Large power, and at the moment it is put into work, it often has a large load pull on the power grid or power station, which is easy to cause instantaneous interference to the power station and power grid, causing tripping and power failure. On the other hand, since the filter inductance in a high-power transmitter is generally not too large, its choke effect often cannot hinder th...

AI Technical Summary

Problems solved by technology

First, when the soft-start time is too long, especially when the AC contactor is out of control and the resistor cannot be short-circuited in time, the resistor will overheat or burn out due to excessive power consumption, and eventually lose the soft-start function; secondly, this soft-start method is not flexible enough , when the high-voltage power supply is divided into multiple gears, the soft-start circuit can only act once, and the soft-start control cannot be performed for each high-voltage gear; again, the length of the soft-start process cannot be adjusted according to needs

Images