压电式提花经编机自升压节能控制电路设计

针对提花经编机压电贾卡针（piezo jacquard needle，PJN）的驱动电路存在功耗高、需要额外的高压电源等问题，设计了一种将自升压电路和工作电路集成为具有能量回收功能的新型PJN驱动电路。基于压电陶瓷晶片的压电方程和PJN结构，介绍了PJN的工作原理，详细分析了所提出的PJN驱动电路的工作模态，给出了电路模态转换的脉冲宽度调制（pulse width modulation，PWM）控制策略。新型PJN驱动电路采用储能电感器代替传统驱动电路的限流电阻器，不仅能够限制PJN的正向充电电流，减少能量损耗，而且可以利用从低压电源吸收的能量将PJN的低压供电电源自适应升压至工作状态所需的高压。为了验证电路的自升压过程，进行了仿真分析。仿真结果表明，该新型PJN驱动电路具有自升压功能，无须外接高压工作电源，仅需低压供电电源即可以高压驱动PJN，能有效降低功耗，实现节能环保，具有广阔的工程应用前景。

Design of self-boosting energy-saving control circuit for piezoelectric jacquard warp knitting machine

In view of the problems of high power consumption and extra high-voltage power supply in the piezoelectric jacquard needle (PJN) drive circuit for jacquard warp knitting machine, a novel PJN driver circuit with energy recovery function which integrates the self-boost circuit and working circuit was proposed. Based on the piezoelectric equation of piezoelectric chip and PJN structure, the working principle of PJN was introduced, the working mode of the proposed PJN drive circuit was analyzed in detail, and the pulse width modulation (PWM) control strategy of circuit mode conversion was given. The new PJN drive circuit adopted the energy storage inductor to replace the current-limiting resistor of the traditional drive circuit, which could not only limit PJN's positive charging current and reduce energy loss, but also used the energy absorbed from the low-voltage power supply to boost the low-voltage power supply of PJN to the high voltage required by the working state adaptively. In order to verify the self-boosting process of the circuit, the simulation analysis was carried out. The simulation results showed that the novel PJN drive circuit had a self-boosting function, and no external high-voltage working power supply was needed. Low-voltage power supply is only needed to drive PJN with high voltage, which can effectively reduce power consumption and realize energy-saving, and has a broad prospect of engineering application.