Green laser pointer needs the manufacturer pay more attention

The power switch of the switching current noise on the environment will inevitably lead to pollution, to reduce the current noise on the human body, select the switching frequency in the ultrasonic frequency band. A full range of protection features: In addition to complete the main task as a product, the number of auxiliary functions can not be ignored. The laser power supply reliability and security is essential. Once the power is a problem, not only result in paralysis of the full set of laser equipment may also be a serious accident tore lamp, quartz protective tube. To join a variety of protective measures. Electrical protection such as slow, soft-start protection, power failure protection, comprehensive quick overvoltage, undervoltage, overcurrent, overtemperature protection. The current display: a good man-machine interface equipment for communication between the people and equipment. It is really serious problem for green laser pointer .
The aircraft in the display panel on the front panel digital display can be time-sharing display current set value and power of the actual output current value. The main circuit topology options. The primary circuit is the circuit of power supply to the laser light source - krypton lamp, the choice of the main circuit is directly related to the performance of the entire power supply. First determine the main circuit must switch circuit switching circuit obvious the advantage of the linear regulator circuit. Then, to determine the choice of the main loop that a topology. According to the requirements of the load, the dynamic resistance of the krypton lamp is very small, and the randomness of fluctuations with the disturbance of the arc discharge, so the power must be the constant current circuit, the maximum that can be adopted by the current of 30A, 30A current krypton lamp The terminal voltage may exceed 200V, the power supply is 220V single-phase electricity.  green laser pointer needs the manufacturer pay more attention to solving it.
After the rectifier filter into a DC voltage of about 300V, even in the grid voltage is reduced by 15%, the rectified voltage 250V. Therefore, using the step-down circuit to meet the requirements of the output voltage. Maximum 6000W output power, means that if the use of high-frequency transformer, you need more transformers in parallel. Transformer magnetic components as a manual winding discreteness of great design complexity and the resulting substantial increase in, we decided that the main circuit topology with transformer. In summary, the use of non-isolated buck Buck circuit as the main circuit topology []. Control mode selection. This is a very difficult choice place. It is the more important measurement of improving the quality and performance of green laser pointer .
There are three options completely analog control and analog PWM chip and MCU hybrid control, complete with the MCU digital control. We first eliminated completely sampling the analog control. The analog control circuit is too complex, the maintenance is also very poor. Because the overall system design to a lot of timing control, as well as key control, display output, these are not the strengths of the analog circuit. In addition, full use of analog circuits is difficult to achieve with the host computer's communication functions. Integrated PWM controller IC and MCU hybrid control. Once we are inclined to this program, but finally gave up. Dedicated integrated PWM control chip to the main circuit, not only low cost, up to a few dollars a chip, and reliable. It is the method of making green laser pointer more suitable to the easy and practical use of the customer.
Determine the basic performance in the PWM chip is selected, without risk. While the MCU 51 microcontroller can be used for timing, keys, display, communications, control, logic control. 51 microcontroller DA output a voltage reference to the PWM control chip to control the PWM chip. The program takes full advantage of the respective advantages of analog circuits and digital circuits, the circuit is simple, to determine the performance, very low risk, but does not meet today's power trends. Fully digital control scheme, we chose the program. The system uses a high-performance MCU as control center, not only the timing, keys, display, control of the communication is more important is to participate in the feedback loop of the main circuit, instead of the feedback loop using a DSP. It is revising the technology of  laser pointer    .