Ningbo Yong Yuan Science and Technology Co., Ltd.   

PVC welding embossing machine: working frequency is 20KHZ. The utility model has the advantages of high electric conversion efficiency, narrow frequency regulation inductance adjustment range, and poor frequency tracking performance. Another disadvantage is that the power can not do great, the biggest is about 3KW; the other is the Taiwan type machine, universal B class power amplifier, over current protection, bridge feedback. The advantage is that the power can be done relatively large (such as 4.2KW), frequency tracking performance is good, high power cases generally use the 15KHZ operating frequency. The disadvantage is that the efficiency of electric conversion is low, the working frequency of 15KHZ is heard by the human ear, which reflects the great noise;