Power circuit diagram design of semiconductor laser tube LD
Overview: 1 The system consists of an input voltage of 24V and a maximum output current of 20A. Different voltages are output according to the number of series laser tubes. If AC power is used, the front end should use AC/DC for the corresponding conversion. The main part of the device is a synchronous DC/DC converter, and its schematic diagram is shown in Figure 1. Vin is the input voltage, VM1 and VM2 are MOSFETs. The turn-on width of VM1 determines the output voltage. The fast recovery diode and VM2 have a common freewheeling circuit. The conduction loss of the rectifier occupies the most important part, so its choice is very important. In the test, a MOSFET with a very low on-resistance was used. The inductor and capacitor form a filter circuit. After the voltage across the measuring resistor is compared with the given value, the corresponding pulse width is generated by the pulse generator to keep the load current stable. VM1 is turned off, the fast recovery diode works, the fast recovery diode has a large on-state loss, and VM2 then turns on the freewheel to reduce system losses.
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Semiconductor laser tubes (LD) and common diodes use different processes, but the voltage and current characteristics are basically the same. At the operating point, a small voltage change can cause a large change in the laser tube current. In addition, excessive current ripple can also make the laser output unstable. The diode laser has very strict requirements on its driving power supply; the output DC current is high, the current is stable, the ripple factor is low, and the power factor is high. As the output power of the laser continues to increase, a high-performance, high-current, steady-current power supply is required to drive. In order to ensure the normal operation of the semiconductor laser, it is necessary to rationally design its driving power supply. With the development of MOSFET technology with high frequency and low switching impedance, the switching power supply with MOSFET as the core appears, and the problem of excessive ripple is generated when the switching power supply outputs a large current. 
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