So we design new type highfrequencyimpulse LED driving circuit using high-efficiency current-limiting technique, which increase the efficiency of LED driving circuit obviously.
因此设计新型高频脉冲led驱动电路，采用高效率的限流措施，显著提高LED驱动电路的效率。
2
The square wave source is an impulse source in which digital technique is used. It has the advantages of rigid phase, highfrequency stabilization and high antijamming.
方波电源是采用数字技术的脉冲电源，具有相位严格、频率稳定度高，抗干扰能力强等独特的优点。
3
In this paper, a dynamic calibration method using a finite duration impulse excitation source is presented, which can be used to calibrate the frequency response of high-pressure transducers (HPT).