The quality and performance of laser pointer can be improved

The quality and performance of laser pointer can be improved
Analysis of the Bode diagram of the existing system can be seen that the existing system is stable, but not good enough. Low frequency approximation of the existing system in a straight line, the low-frequency gain is obvious enough. Frequency area is too wide, but in general the bandwidth of the switching power supply is located in the switching frequency of 1/10 ~ 1/20, poor high-frequency anti-jamming capability. Therefore need to design a controller to correct the Bode diagram of the entire system. Can be seen from the Bode diagram of the system can only use an integral part of, or the phase angle will be drastically reduced to -180, resulting in system instability. Only an integral part of the low-frequency gain slope is not steep, but to ensure the stability. Set at 100Hz at a low frequency zero. The five laser caps can be attached to the blue laser, green laser and red laser of laser pointer .
Because the grid voltage after bridge rectifier to 100Hz sinusoidal half-wave into the 100Hz pulsating DC smoothing filter in the input filter capacitor, this pulsating current control system input voltage.This means that the gain of the 100Hz signal 2, which can effectively resist such input voltage fluctuations. The entertainmental effect created by the blue laser pointer is good enough.
At 1KHz, the phase decreases rapidly to compensate for this phase, a zero increase in phase. The corner frequency set to 1000Hz, the transfer function is set to 0.001s +1, can provide about 45 of the phase advance. The figure shows that the crossover frequency is not in the frequency area, the crossover frequency is set at about 1/10 of the switching frequency, need to gain to enhance the overall 44dB, then take K = 150. Income Bode diagram in Figure 47 as shown. This chapter briefly describes the structure and design ideas for the entire software system. For real-time requirements for different tasks, how to make reasonable arrangements. Digital controller to do a detailed study, a detailed record of the model derivation, the controller design process. Discussed in this paper is to reflect the true of my bachelor's degree are engaged during the DSP fully digital laser power development projects. The aluminum case is convenient for the customer to hold all parts and components of laser pointer .