CN205543671U - Soft switch laser drive circuit - Google Patents

Abstract

The utility model provides a soft switch laser drive circuit, wherein C1 is direct current filter capacitance, and C2, C3 are resonant capacitor, and with MOS1, MOS2, inductance L1, transformer T1 constitutes the soft switch circuit of half -bridge together, diode D1, D2, D3, D4, L2, electric capacity cd are output Rectifier filter circuit, and resistance R1, R2 are driving resistance, and transformer T2 is driving transformer.

Description

A kind of Sofe Switch drive circuit for laser

Technical field

This utility model relates to the drive circuit of a kind of laser instrument, belongs to photoelectron technical field.

Background technology

The kind of laser instrument has a variety of, as solid state laser, gas laser, semiconductor laser, light Fibre laser etc..In the middle of these laser instrument, in addition to part semiconductor laser instrument belongs to Direct Current pumping, Remaining laser instrument is essentially all and carries out pumping by pumping source, especially for powerful laser instrument, needs Use powerful drive circuit that pumping source is driven, thus produce powerful pump light, but existing Having in technology and generally be directed to the drive circuit that different laser instrument designs is different, general drive circuit is the most logical Cross simple change can be adapted on other laser instrument.Further, for the drive circuit of high power laser, Superpower laser it is generally required to driving voltage the highest, now, transformator be difficult to design, major embodiment Bad in insulation, greatly, in the problems such as leakage inductance is big, furthermore such circuit, the secondary devices of transformator is or not parasitic capacitance Easily choose.This utility model puts forward for the problems referred to above just.

Utility model content

According to an embodiment of the present utility model, it is provided that a kind of laser instrument Sofe Switch drive circuit, including input End, wherein input includes that positive input terminal vin1+ and negative input end vin1-, positive input terminal vin1+ connect respectively One end of electric capacity C1, one end of electric capacity C2 and the drain electrode of field effect transistor MOS1, negative input end vin1- Connect the other end of electric capacity C1, one end of electric capacity C3 and the source electrode of field effect transistor MOS2, electric capacity respectively The other end of C2 connects the other end of electric capacity C3 one end of connection inductance L1 jointly, another of inductance L1 End connects source electrode and the drain electrode of field effect transistor MOS2, the secondary of transformator T2 of field effect transistor MOS1 respectively Including two coils, two different name ends in two coils connect field effect transistor respectively through resistance R1 and R2 MOS1 and the grid of field effect transistor MOS2, two other different name end then distinguishes connection value field effect transistor MOS1 With the source electrode of field effect transistor MOS2, two inputs of the primary coil of transformator T2 connect driving letter respectively Number two outfans, transformator T1 primary coil is in parallel with inductance L1, the two of transformator T1 secondary coil In individual outfan one connects negative electrode and the anode of diode D2 of diode D1 respectively, and another one is divided Not Lian Jie the negative electrode of diode D3 and the anode of diode D4, the anode of diode D1 is with diode D3's Anode is common one end connecting electric capacity Cd respectively after connecting, one end of resistance R and one end of load, and two The negative electrode of pole pipe D2 is common one end connecting inductance L2, inductance L2 after being connected with the negative electrode of diode D4 Other end connect the other end of electric capacity Cd, the other end of resistance R and IGCT THY respectively Anode, the negative electrode of IGCT THY connects the other end of load, output voltage detecting circuit and resistance R Parallel connection, the output of output voltage detecting circuit connects an input of comparator, and the outfan of comparator connects The input of frequency adjustment circuit, the outfan of frequency adjustment circuit connects the input of drive circuit, comparator The another one input given voltage of input.

Accompanying drawing explanation

Accompanying drawing 1 is the schematic diagram of drive circuit for laser of the present utility model.

Detailed description of the invention

Drive circuit for laser of the present utility model will be described below in detail on the basis of combining accompanying drawing.This practicality Novel drive circuit for laser particular make-up is as follows:

Including input, wherein input includes positive input terminal vin1+ and negative input end vin1-, positive input terminal Vin1+ connects one end of electric capacity C1, one end of electric capacity C2 and the drain electrode of field effect transistor MOS1 respectively, negative Input vin1-connects the other end of electric capacity C1 respectively, one end of electric capacity C3 and field effect transistor MOS2 Source electrode, the other end of electric capacity C2 connects the other end of electric capacity C3 and jointly connects one end of inductance L1, inductance The other end of L1 connects the source electrode of field effect transistor MOS1 and the drain electrode of field effect transistor MOS2, transformator respectively The secondary of T2 includes two coils, and two different name ends in two coils connect respectively through resistance R1 and R2 Field effect transistor MOS1 and the grid of field effect transistor MOS2, two other different name end then distinguishes connection value field effect Should pipe MOS1 and the source electrode of field effect transistor MOS2, two inputs of the primary coil of transformator T2 are respectively Connecting two outfans driving signal, transformator T1 primary coil is in parallel with inductance L1, transformator T1 time A negative electrode connecting diode D1 respectively in two outfans of level coil and the anode of diode D2, Another one connects negative electrode and the anode of diode D4 of diode D3 respectively, the anode of diode D1 with The anode of diode D3 is common one end connecting electric capacity Cd the most respectively after connecting, one end of resistance R and negative The one end carried, the negative electrode of diode D2 is common after being connected with the negative electrode of diode D4 connects the one of inductance L2 End, the other end of inductance L2 connects the other end of electric capacity Cd respectively, the other end of resistance R and The anode of IGCT THY, the negative electrode of IGCT THY connects the other end of load, and output voltage detects Circuit is in parallel with resistance R, and the output of output voltage detecting circuit connects an input of comparator, compares The input of the outfan rate of connections regulation circuit of device, the outfan of frequency adjustment circuit connects drive circuit Input, the given voltage of another one input input of comparator.

The circuit of above-mentioned driving of the present utility model is a kind of soft switch circuit.Wherein C1 is DC filter capacitor, C2, C3 are resonant capacitance, and with MOS1, MOS2, inductance L1, it is soft that transformator T1 forms half-bridge together On-off circuit, diode D1, D2, D3, D4, L2, electric capacity Cd is output rectifier and filter, resistance R1, R2 are for driving resistance, and transformator T2 is driving transformer.

Working method is as follows, MOS1 turn on, turn off afterwards, rear MOS2 turn on, after turn off again, so follow Ring.Wherein MOS1, identical with the ON time of MOS2, respectively account for the half of same switch periods, alternately lead Logical frequency is determined by the output voltage needed, during the output voltage height of needs, and the driving of MOS1 and MOS2 Frequency becomes big, and when the output voltage of needs is low, the driving frequency of MOS1 and MOS2 diminishes, and is driven by regulation The size of dynamic frequency reaches to control the purpose of output voltage, when driving frequency reaches the resonance of L1 Yu C1+C2 During frequency, there is the highest output voltage.In whole work process, MOS1, MOS2 are soft open-minded, soft Turn off.

General laser instrument is all that input voltage is relatively low but output voltage is the highest.The primary and secondary no-load voltage ratio of transformator compares Greatly, it is not easy to design.This circuit is voltage resonant circuit, and during resonance, L1 can be that several times of input voltage arrive Tens times, then the boosting again through transformator, with the transformator of smaller no-load voltage ratio, i.e. can reach and want Output voltage.

Claims (1)

1. a laser instrument Sofe Switch drive circuit, including input, wherein input includes positive input terminal vin1+ One end of electric capacity C1, one end of electric capacity C2 is connected respectively with negative input end vin1-, positive input terminal vin1+ And the drain electrode of field effect transistor MOS1, negative input end vin1-connects the other end of electric capacity C1 respectively, electricity Holding one end and the source electrode of field effect transistor MOS2 of C3, the other end of electric capacity C2 connects electric capacity C3's One end of the other end jointly connection inductance L1, the other end of inductance L1 connects field effect transistor MOS1 respectively Source electrode and the drain electrode of field effect transistor MOS2, the secondary of transformator T2 includes two coils, two lines Two different name ends in circle connect field effect transistor MOS1 and field effect transistor respectively through resistance R1 and R2 The grid of MOS2, two inputs of the primary coil of transformator T2 connect two of driving signal respectively Outfan, transformator T1 primary coil is in parallel with inductance L1, and two of transformator T1 secondary coil defeated Going out negative electrode and the anode of diode D2 that in end connects diode D1 respectively, another one is respectively Connect negative electrode and the anode of diode D4 of diode D3, the anode of diode D1 and diode D3 Anode connect after common one end connecting electric capacity Cd the most respectively, one end of resistance R and the one of load End, the negative electrode of diode D2 is common one end connecting inductance L2 after being connected with the negative electrode of diode D4, The other end of inductance L2 connects the other end of electric capacity Cd, the other end of resistance R and crystalline substance respectively The anode of brake tube THY, the negative electrode of IGCT THY connects the other end of load, and output voltage detects Circuit is in parallel with resistance R, and the output of output voltage detecting circuit connects an input of comparator, than The input of the outfan rate of connections regulation circuit of relatively device, the outfan of frequency adjustment circuit connects driving The input of circuit.