CN203871651U - Laser device constant current source drive circuit - Google Patents
Laser device constant current source drive circuit Download PDFInfo
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- CN203871651U CN203871651U CN201420291006.4U CN201420291006U CN203871651U CN 203871651 U CN203871651 U CN 203871651U CN 201420291006 U CN201420291006 U CN 201420291006U CN 203871651 U CN203871651 U CN 203871651U
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Abstract
The utility model discloses a laser device constant current source drive circuit comprising a power supply module, a constant current source drive module, an over-current protection circuit, an overvoltage protection circuit, an overheating protection circuit, a switch circuit module and a multipoint control module. The laser device constant current source drive circuit supplies a constant current source to a load via the constant current source drive module so as to drive the load, and influence of change of external impedance on output current is small. The laser device constant current source drive circuit is provided with the over-current protection circuit, the overvoltage protection circuit and the overheating protection circuit. A laser device of the load is protected via disconnection of the switch circuit module through control under the situations of oversized output current of the constant current source drive module and overvoltage or overheating of a constant current source drive module power field effect tube so that burnout of the laser device of the load is avoided.
Description
Technical field
The utility model relates to a kind of drive circuit, is specifically related to a kind of laser constant-current source driving circuit.
Background technology
Semiconductor laser precision, costliness very, and very high to the stability requirement of drive current.Therefore, drive circuit just seems particularly important.Semiconductor laser has strict requirement to electric current, voltage, once occur that overvoltage or over-current phenomenon avoidance can cause laser to burn.In order to ensure the use safety of laser, the maximum current of laser and maximum voltage have strict control.In addition, the power field effect pipe in drive circuit is easily breakdown in the time of overvoltage or superheat state, after power field effect pipe is breakdown, can cause supply voltage to be directly loaded into load (semiconductor laser) two ends, thereby moment is burnt laser.
Therefore, prevent that laser from becoming this area technical problem urgently to be resolved hurrily because of drive circuit overcurrent, overvoltage and overheated burning.
Utility model content
The purpose of this utility model is the above-mentioned defect for prior art, proposes a kind of laser constant-current source driving circuit, and in solution prior art, laser is because of drive circuit overcurrent, overvoltage and overheated technical problem of burning.
The technical solution of the utility model comprises a kind of laser constant-current source driving circuit, comprising:
Power module;
Be connected with described power module and according to the constant-current source driver module of the driving voltage control laser drive current of described power module, described constant-current source driver module comprises at least one power field effect pipe;
Detect the current foldback circuit of described constant-current source driver module output current output electric current measure signal;
Detect the power field effect pipe output voltage of described constant-current source driver module the overvoltage crowbar of voltage sense signal;
Detect the power field effect pipe temperature of described constant-current source driver module the overheating protection circuit of output temperature detection signal;
Switching circuit module; And
The multiple spot control module that receives the detection signal of described current foldback circuit, overvoltage crowbar, overheating protection circuit and be communicated with or disconnect according to switching circuit module described in this detection signal control.
Preferably, described constant-current source driver module comprise voltage regulation unit, the voltage follow unit being connected with voltage regulation unit, partial pressure unit, first integral unit, second integral unit, the first power field effect pipe and the second power field effect pipe being connected with voltage follow unit; The output of described partial pressure unit accesses respectively described first integral unit and described second integral unit, and the output of described first integral unit is connected with the grid of the first power field effect pipe; The output of described second integral unit is connected with the grid of the second power field effect pipe.
Preferably, described the first power field effect pipe and described the second power field effect pipe are IRF1405.
Preferably, described power module comprises DC constant voltage source, DC/DC converting unit, filter unit, current limliting unit and power supply chip, and the direct voltage of described DC constant voltage source output is outputting drive voltage after described DC/DC converting unit, filter unit, current limliting unit, power supply chip are processed successively.
Preferably, described current foldback circuit comprises:
For gathering the current sample module of described constant-current source driver module output current;
The low-pass filtering module that is connected with described current sample module, the current signal of current sample module output is carried out to filtering processing;
Be connected with described low-pass filtering module, the current signal of low-pass filtering module output is carried out to amplifying signal amplification module; ;
Be connected, the current signal of signal amplification module output be converted to the modular converter of voltage signal with described signal amplification module;
By described voltage signal and the first reference voltage compare, the first comparison module of output low level signal in the time that this voltage signal exceedes threshold value.
Preferably, described overvoltage crowbar comprises:
For gathering the voltage sample module of described constant-current source driver module power field effect pipe magnitude of voltage;
The the first voltage follow module being connected with voltage sample module;
Be connected and the voltage signal of voltage sample module collection and the second reference voltage compared, in the time that this voltage signal exceedes threshold value, exported the second comparison module of high level signal with the first voltage follow module;
For being gone out to light signal, laser is converted to the level switch module of high level signal;
Two NAND gate logical circuits that input is connected with described level switch module with described the second comparison module respectively.
Preferably, described overheating protection circuit comprises:
For gathering the temperature sampling module of described constant-current source driver module power field effect pipe temperature value;
For the temperature signal of temperature sampling module being converted to the signal processing module of voltage signal;
By described voltage signal and the 3rd reference voltage compare, the 3rd comparison module of output low level signal in the time that this voltage signal exceedes threshold value.
Preferably, described constant-current source driver module also comprises a protected location, comprising:
Be used for the feedback subelement that receives the detection signal of described current foldback circuit, overvoltage crowbar, overheating protection circuit and produce feedback signal;
The switch subelement that is communicated with or disconnects according to power field effect pipe described in this feedback signal control is connected with power field effect pipe.
Compared with prior art, the beneficial effects of the utility model comprise: laser constant-current source driving circuit of the present utility model reaches for load provides constant-current source the object that drives load by constant-current source driver module, and external impedance changes its output current impact little; Laser constant-current source driving circuit of the present utility model has current foldback circuit, overvoltage crowbar and overheating protection circuit;, constant-current source driver module power field effect pipe overvoltage excessive at constant-current source driver module output current or overheated in the situation that; by the disconnection protection load laser of control switch circuit module, avoid it to burn.
Brief description of the drawings
Fig. 1 is the structured flowchart of the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 2 is the concrete structure figure of the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 3 is the partial circuit figure of constant-current source driver module in the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 4 is the partial circuit figure of power module in the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 5 is the partial circuit figure of current foldback circuit in the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 6 is the partial circuit figure of overvoltage crowbar in the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 7 is the partial circuit figure of overheating protection circuit in the laser constant-current source driving circuit of the utility model embodiment 1;
Fig. 8 is the partial circuit figure of switching circuit module in the laser constant-current source driving circuit of the utility model embodiment 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The utility model provides a kind of laser constant-current source driving circuit, comprising:
Power module;
Be connected with described power module and according to the constant-current source driver module of the driving voltage control laser drive current of described power module, described constant-current source driver module comprises at least one power field effect pipe;
Detect the current foldback circuit of described constant-current source driver module output current output electric current measure signal;
Detect the power field effect pipe output voltage of described constant-current source driver module the overvoltage crowbar of voltage sense signal;
Detect the power field effect pipe temperature of described constant-current source driver module the overheating protection circuit of output temperature detection signal;
Switching circuit module; And
The multiple spot control module that receives the detection signal of described current foldback circuit, overvoltage crowbar, overheating protection circuit and be communicated with or disconnect according to switching circuit module described in this detection signal control.
Particularly, laser constant-current source driving circuit of the present utility model reaches for load provides constant-current source the object that drives load by constant-current source driver module, and external impedance changes its output current impact little; Laser constant-current source driving circuit of the present utility model has current foldback circuit, overvoltage crowbar and overheating protection circuit;, constant-current source driver module power field effect pipe overvoltage excessive at constant-current source driver module output current or overheated in the situation that; by the disconnection protection load laser of control switch circuit module, avoid it to burn.
embodiment 1:
Embodiment 1 of the present utility model provides a kind of laser constant-current source driving circuit; refer to shown in Fig. 1 and Fig. 2, this drive circuit comprises: power module 101, constant-current source driver module 102, current foldback circuit 103, overvoltage crowbar 104, overheating protection circuit 105, switching circuit module 106 and multiple spot control module 107.Wherein, power module 101 provides a DC constant voltage; Constant-current source driver module 102 is connected with power module 101, and according to the driving voltage control laser drive current of power module 101, constant-current source driver module 102 comprises at least one power field effect pipe; Current foldback circuit 103 detects output current the output electric current measure signal of constant-current source driver module 102; Overvoltage crowbar 104 detects power field effect pipe output voltage the voltage sense signal of constant-current source driver module 102; Overheating protection circuit 105 detects power field effect pipe temperature the output temperature detection signal of constant-current source driver module 102; Multiple spot control module 107 receives the detection signal of current foldback circuit 103, overvoltage crowbar 104, overheating protection circuit 105 and is communicated with or disconnects according to these detection signal control switch circuit 106 modules.
Further, the constant-current source driver module 102 of the present embodiment has adopted two power field effect pipes in parallel to carry out current-sharing, the size of constant current is adjustable, specifically refer to shown in Fig. 2 and Fig. 3, constant-current source driver module 102 comprises voltage regulation unit 1021, the voltage follow unit 1022 being connected with voltage regulation unit 1021, the partial pressure unit 1023 being connected with voltage follow unit 1022, first integral unit 1024, second integral unit 1025, the first power field effect pipe 1026 and the second power field effect pipe 1027; The output of partial pressure unit 1023 accesses respectively first integral unit 1024 and second integral unit 1025, and the output of first integral unit 1024 is connected with the grid of the first power field effect pipe 1026; The output of second integral unit 1025 is connected with the grid of the second power field effect pipe 1027.
Closer; constant-current source driver module 102 also comprises protected location 1028; comprise: feedback subelement and switch subelement; feedback subelement is for receiving the detection signal of current foldback circuit 103, overvoltage crowbar 104, overheating protection circuit 105 and producing feedback signal, and switch subelement is connected with power field effect pipe and is communicated with or disconnects according to this feedback signal power ratio control field effect transistor.Occurring when overcurrent, overvoltage and overheat condition, protected location 1028 disconnects constant-current source driver module 102, carries out self-protection, also can protect laser when malfunctioning switching circuit module 106 is temporary transient.
The output voltage of power module 101 is inputted through the voltage regulation unit 1021 of R11, R90, R91, TL3 composition, the voltage follow unit 1022 of U3 composition, partial pressure unit 1023 through R9, R15, W1 composition is carried out dividing potential drop, is input to respectively two-way integrating circuit: first integral unit 1024(is made up of U2-A, R4, R7, RS1, C2) and second integral unit 1025(formed by U2-B, R17, R19, RS2, C10).First integral unit 1024 outputs to Q2(the first power field effect pipe 1026 by R8 and R10), second integral unit 1025 outputs to Q3(the second power field effect pipe 1027 by R16 and R18), realize constant current control.
R23, Q4, D2 and K1 composition protected location 1028.When overcurrent, overvoltage or when overheated, MUC (U4) control relay closure, by the control line ground connection of power field effect pipe, thoroughly turn-offs power field effect pipe.Thereby realize the function of protection laser.
In the present embodiment, the first power field effect pipe and the second power field effect pipe are IRF1405.
Refer to shown in Fig. 2 and Fig. 4, power module 101 comprises DC constant voltage source 1011, DC/DC converting unit 1012, filter unit 1013, current limliting unit 1014 and power supply chip 1015, and the direct voltage that export in DC constant voltage source 1011 is outputting drive voltage after described DC/DC converting unit 1012, filter unit 1013, current limliting unit 1014, power supply chip 1015 are processed successively.For example,, from P4 input 12V direct voltage, through U18(DC/DC converting unit 1012) convert to ± 12V direct voltage ,+12V direct voltage is through C28, C29 filtering, then after R80-R83 current limliting through convert to+5V of U11 power supply chip voltage.
Refer to shown in Fig. 2 and Fig. 5, current foldback circuit 103 comprises: current sample module 1031, low-pass filtering module 1032, signal amplification module 1033, modular converter 1034 and the first comparison module 1035, wherein, the electric current that current sample module 1031 is exported for gathering constant-current source driver module 102; Low-pass filtering module 1032 is connected with current sample module 1031 and current signal that current sample module 1031 is exported carries out filtering processing; The current signal that signal amplification module 1033 is connected with low-pass filtering module 1032, low-pass filtering module 1032 is exported amplifies; The current signal that modular converter 1034 is connected with signal amplification module 1033, signal amplification module 1033 is exported is converted to voltage signal; The first comparison module 1035 by this voltage signal and the first reference voltage compare, output low level signal in the time that this voltage signal exceedes threshold value.
Gather the current signal of constant-current source driver module 102 by the accurate shunt of 1 milliohm, through low-pass filter unit 1032 filtering of R27, R30, C50, C51 composition, be input to instrument amplifier U5(signal amplification module 1033), output to voltage comparator U13-A(the first comparison module 1035 through R28) reference voltage that provides with W3 compares.When there is overcurrent, once for example electric current exceedes 100A, voltage comparator U13-A pulls up a horse output low level signal to MCU(U4, multiple spot control module 107).R42 and W2 are for the multiplication factor of regulation meter amplifier U5.
Refer to shown in Fig. 2 and Fig. 6, overvoltage crowbar 104 comprises: voltage sample module 1041, the first voltage follow module 1042, the second comparison module 1043, level switch module 1044 and NAND gate logical circuit 1045, wherein, voltage sample module 1041 is for gathering constant-current source driver module 102 power field effect pipe magnitudes of voltage; The first voltage follow module 1042 is connected with voltage sample module 1041; The second comparison module 1043 voltage signal and the second reference voltage that voltage sample module 1041 is gathered that be connected with the first voltage follow module 1042 compares, in the time that this voltage signal exceedes threshold value, exports high level signal; Level switch module 1044 is converted to high level signal for laser is gone out to light signal; Two inputs of NAND gate logical circuit 1045 are connected with level switch module 1044 with the second comparison module 1043 respectively.
Particularly, voltage on the power field effect pipe collecting is through the first voltage follow module 1042 of R85 and U6 composition, and the reference voltage providing to the second comparison module 1043 and the W4 of U6-B composition through R39 compares and outputs to NAND gate U14(NAND gate logical circuit 1045).Laser output signal outputs to NAND gate U14 through the level switch module 1044 of R2, R3 and Q1 composition.In the time of laser bright dipping, power field effect pipe overvoltage simultaneously, NAND gate U14 just meeting output low level arrives MCU(U4, multiple spot control module 107).
Refer to shown in Fig. 2 and Fig. 7, overheating protection circuit 105 comprises: temperature sampling module 1051, signal processing module 1052 and the 3rd comparison module 1053, wherein, temperature sampling module 1051 is for gathering the power field effect pipe temperature value of constant-current source driver module 102; Signal processing module 1052 is for being converted to voltage signal by the temperature signal of temperature sampling module 1051; The 3rd comparison module 1053 by this voltage signal and the 3rd reference voltage compare, output low level signal in the time that this voltage signal exceedes threshold value.
Particularly, RT1 gathers power field effect pipe temperature, through R46 dividing potential drop, be input to voltage follower U10-A(the 3rd comparison module 1053) reference voltage that provides with W5, in the time that power field effect pipe is overheated, voltage follower U10-A meeting output low level is to MCU(U4, multiple spot control module 107).
Refer to shown in Fig. 8, U7 is by MCU(U4, multiple spot control module 107) control by the voltage follower of R34, U9 composition and output to Switching Power Supply, the output voltage of control switch power supply.When overcurrent, overvoltage or when overheated, stopcock supply voltage at once, thus ensure the safety of laser.The voltage stabilizing circuit of R25, R26, R29, TL1, C14 and C17 composition, for U7 provides reference voltage.
The above embodiment of the present utility model, does not form the restriction to the utility model protection range.Any various other corresponding changes and distortion of making according to technical conceive of the present utility model, all should be included in the protection range of the utility model claim.
Claims (8)
1. a laser constant-current source driving circuit, is characterized in that, comprising:
Power module;
Be connected with described power module and according to the constant-current source driver module of the driving voltage control laser drive current of described power module, described constant-current source driver module comprises at least one power field effect pipe;
Detect the current foldback circuit of described constant-current source driver module output current output electric current measure signal;
Detect the power field effect pipe output voltage of described constant-current source driver module the overvoltage crowbar of voltage sense signal;
Detect the power field effect pipe temperature of described constant-current source driver module the overheating protection circuit of output temperature detection signal;
Switching circuit module; And
The multiple spot control module that receives the detection signal of described current foldback circuit, overvoltage crowbar, overheating protection circuit and be communicated with or disconnect according to switching circuit module described in this detection signal control.
2. laser constant-current source driving circuit according to claim 1, it is characterized in that, described constant-current source driver module comprises voltage regulation unit, the voltage follow unit being connected with voltage regulation unit, partial pressure unit, first integral unit, second integral unit, the first power field effect pipe and the second power field effect pipe being connected with voltage follow unit; The output of described partial pressure unit accesses respectively described first integral unit and described second integral unit, and the output of described first integral unit is connected with the grid of the first power field effect pipe; The output of described second integral unit is connected with the grid of the second power field effect pipe.
3. laser constant-current source driving circuit according to claim 2, is characterized in that, described the first power field effect pipe and described the second power field effect pipe are IRF1405.
4. laser constant-current source driving circuit according to claim 1, it is characterized in that, described power module comprises DC constant voltage source, DC/DC converting unit, filter unit, current limliting unit and power supply chip, and the direct voltage of described DC constant voltage source output is outputting drive voltage after described DC/DC converting unit, filter unit, current limliting unit, power supply chip are processed successively.
5. laser constant-current source driving circuit according to claim 1, is characterized in that, described current foldback circuit comprises:
For gathering the current sample module of described constant-current source driver module output current;
The low-pass filtering module that is connected with described current sample module, the current signal of current sample module output is carried out to filtering processing;
Be connected with described low-pass filtering module, the current signal of low-pass filtering module output is carried out to amplifying signal amplification module;
Be connected, the current signal of signal amplification module output be converted to the modular converter of voltage signal with described signal amplification module;
By described voltage signal and the first reference voltage compare, the first comparison module of output low level signal in the time that this voltage signal exceedes threshold value.
6. laser constant-current source driving circuit according to claim 5, is characterized in that, described overvoltage crowbar comprises:
For gathering the voltage sample module of described constant-current source driver module power field effect pipe magnitude of voltage;
The the first voltage follow module being connected with voltage sample module;
Be connected and the voltage signal of voltage sample module collection and the second reference voltage compared, in the time that this voltage signal exceedes threshold value, exported the second comparison module of high level signal with the first voltage follow module;
For being gone out to light signal, laser is converted to the level switch module of high level signal;
Two NAND gate logical circuits that input is connected with described level switch module with described the second comparison module respectively.
7. laser constant-current source driving circuit according to claim 5, is characterized in that, described overheating protection circuit comprises:
For gathering the temperature sampling module of described constant-current source driver module power field effect pipe temperature value;
For the temperature signal of temperature sampling module being converted to the signal processing module of voltage signal;
By described voltage signal and the 3rd reference voltage compare, the 3rd comparison module of output low level signal in the time that this voltage signal exceedes threshold value.
8. laser constant-current source driving circuit according to claim 3, is characterized in that, described constant-current source driver module also comprises a protected location, comprising:
Be used for the feedback subelement that receives the detection signal of described current foldback circuit, overvoltage crowbar, overheating protection circuit and produce feedback signal;
The switch subelement that is communicated with or disconnects according to power field effect pipe described in this feedback signal control is connected with power field effect pipe.
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| CN109412002A (en) * | 2018-12-26 | 2019-03-01 | 吉林大学 | A kind of high efficiency laser pump (ing) source device |
| CN109412005A (en) * | 2018-12-26 | 2019-03-01 | 吉林大学 | A kind of program control type high efficiency laser pump (ing) source module |
| CN110967993A (en) * | 2019-10-29 | 2020-04-07 | 大族激光科技产业集团股份有限公司 | Closed-loop laser signal driving system |
| CN110994356B (en) * | 2019-12-17 | 2021-04-09 | 无锡锐科光纤激光技术有限责任公司 | Constant current power supply circuit for pulse laser |
| CN110994356A (en) * | 2019-12-17 | 2020-04-10 | 无锡锐科光纤激光技术有限责任公司 | Constant current power supply circuit for pulse laser |
| CN111799648A (en) * | 2020-07-23 | 2020-10-20 | 哈尔滨理工大学 | Low-temperature drift driving circuit of current tuning semiconductor laser |
| RU2750851C1 (en) * | 2020-09-30 | 2021-07-05 | Федеральное государственное бюджетное учреждение науки Институт проблем механики им. А.Ю. Ишлинского Российской академии наук (ИПМех РАН) | Ionization pulse generator |
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