Wireless presenter green laser used by many customers

The discharge circuit is provided for the xenon lamp and high voltage pulsed xenon lamp gas breakdown ionization formation, constitute the conductive channel, the formation of the discharge pulse, the desired pulse shape. Xenon lamp, each time the trigger is used in high-voltage pulse trigger, such a trigger is often caused by electrode sputtering, so that the shortened life expectancy of the xenon lamp. Xenon lamp trigger the high voltage pulse will be the electronic circuit to produce a strong electromagnetic interference, breakdown voltage and the plasma channel by a small change of the conduction current and light irregular cooling, tend to make the discharge pulse amplitude and width have a significant jitter. To eliminate these effects, the precombustion circuit to maintain a low current discharge during the light pulse discharge gap to achieve the pre-ionization, thus eliminating the high-voltage pulse to trigger the negative effects. The emitter of  green laser pointer will send various orders to the receiver.
For a single pulse peak power, the system is often the introduction of Q-circuit Q-circuit is mainly composed by the crystal at high pressure and high-voltage circuit, which is the energy to activate the ions are stored in the energy state of the laser material, open in the Q-switched concentrated within a very short time, released, so that the laser peak power is increased by several orders of magnitude, Q - the emergence of a major breakthrough in the history of the development of laser. In this chapter we will discuss this part works, and its main circuit for further discussion. 2.2 Charging the works of the main circuit and over current protection 2.2.1 Overview of the solid pulse laser power system, the laser pumping work short discharge time, discharge power, most of the laser energy storage network still uses capacitors as energy storage components. Capacitor charging voltage U0, the stored electric field energy: E0 = 0, the CU 1 2 2 where E 0 is the capacitance of the stored energy (J) C is the capacitance of power (F) U-0 for the capacitor terminal voltage. So that the computer can perform the predicted the order and program sent by  green laser pointer .
In charge of the main loop, when the laser discharge electrical energy, the discharge voltage, according to the above equation can determine the energy storage capacitor capacity and pressure value. Compared with other energy storage devices, capacitors store the same energy, the class of volume and price than the inductance component is much smaller in the laser power system in most of the capacitance as a simple storage device, the so-called capacitance library refers to the storage capacitor has a capacitance value. Laser charging a simple circuit shown in Figure 2-1. Capacitance of energy storage devices provided by the high voltage power supply for a given voltage, connected in series between the storage electric capacity C and xenon lamp with a high-power switching elements such as SCR or IGBT - Insulated Gate Bipolar Transistor, when the IGBT is turned off high voltage power supply, charging the capacitor, and charging to a given value, the IGBT turn-capacitor C to discharge xenon lamp. And the projection screen can display various contents the customer wanna present by  green laser pointer .
The system can be achieved by controlling the initial discharge voltage when the IGBT when the Department of conduction, set the single-pulse discharge energy. Tube voltage drop across the IGBT turn-on can be ignored, RC discharge circuit consisting of capacitance C and the xenon lamp resistance R when C is large, in? S ~ ms during the discharge lamp voltage is regarded as the same, but the current decline is relatively flat, the pump energy is not concentrated, often constitute a simulation discharge line circuit in the discharge circuit inductance. As the voltage on the capacitor can not change suddenly. In charge of the initial stage of the UC = 0, the capacitance is equivalent to short-circuit when the voltage charge on the capacitor close to the supply voltage, the capacitor is equivalent to open. Therefore the capacitor as the load is a drastic change in the charge and discharge process parameters, the charging circuit to be able to limit the charging current of the storage network should be able to send to the storage network at a certain frequency a certain energy [2] . The wireless presenter  green laser pointer is really a very useful and practical tool.
Figure 2-1 capacitor charge and discharge schematic charging circuit according to a certain frequency transfer energy to the storage network, reducing the impact of switching losses and switching circuit design of a basic starting point of the charging circuit. Now widely used in most of the charging circuit is a pulse width modulation techniques, namely the PWM modulation technique. In the conventional PWM switching circuit, the switching device is under high pressure conduction through the high-current shutdown, and the whole process is a form of forced switching process is a way to control the duty cycle to achieve power regulation. This control method the advantages mainly in the circuit structure is simple, easy to control, steady-state current gain and the load has nothing to do. While its defects are also very obvious, with the inverter frequency increases the switching losses also increased significantly, to further improve the PWM switching frequency tend to be opened, the turn-off loss to increase the limit. Circuit current changes in the amount of inductive components in the switching device is turned off di / dt is too large. Wireless presenter  green laser     used by many customers.