CN113746335B - Laser power supply control circuit and laser device - Google Patents
Laser power supply control circuit and laser device Download PDFInfo
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- CN113746335B CN113746335B CN202111297013.6A CN202111297013A CN113746335B CN 113746335 B CN113746335 B CN 113746335B CN 202111297013 A CN202111297013 A CN 202111297013A CN 113746335 B CN113746335 B CN 113746335B
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- 238000005070 sampling Methods 0.000 claims abstract description 35
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 56
- 230000005611 electricity Effects 0.000 claims description 27
- 238000001914 filtration Methods 0.000 claims description 15
- 230000002441 reversible effect Effects 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 230000007423 decrease Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention relates to the field of laser driving power supplies, and provides a laser power supply control circuit, which comprises: the pump source, AC/DC constant voltage module, DC/DC linear constant current module includes: the voltage drop sampling circuit is electrically connected with the pole D, S of the MOS tube, the control module is electrically connected with the voltage drop sampling circuit, the D pole of the MOS tube is electrically connected with the AC/DC constant voltage module, and the S pole of the MOS tube is electrically connected with the pumping source; the voltage drop sampling circuit is used for collecting voltage values at two ends of the pole of the MOS tube D, S and feeding the voltage values back to the control module; the control module is used for carrying out logical operation on the voltage drop value to obtain a voltage drop value and feeding the voltage drop value back to the AC/DC constant voltage module, and the AC/DC constant voltage module regulates and controls the magnitude of an output voltage value according to the voltage drop value; compared with the prior art, the problem that the power loss of the power supply control circuit of the laser is large is solved, and the heat dissipation burden of the laser is reduced.
Description
Technical Field
The invention relates to the field of laser driving power supplies, in particular to a laser power supply control circuit and laser equipment.
Background
In the using process of the laser, the output voltage of the pumping source is generally adjusted according to actual requirements to adjust the power required by the laser processing, so that the linear constant current source supplying power to the pumping source is not fully loaded, that is, part of current of the constant current source is supplied to the pumping source to emit pumping light, the other part of current is remained, a large amount of heat can be generated by the remained current, and the heat can bring great damage to the performance of the laser. That is, the power in the power control circuit cannot be fully utilized, and meanwhile, a great burden is also imposed on the heat dissipation management system of the laser, which is directly related to the design of the power control circuit of the existing laser, and please refer to fig. 1, it can be known that the connection relationship between the AC/DC constant voltage module and the DC/DC linear constant current source module in the power control circuit of the existing laser. The design causes the operation efficiency of the laser power supply control circuit to be limited, and meanwhile, the MOS tube in the DC/DC linear constant current source generates larger power loss along with the change of the load (the magnitude of the current) in the actual operation of the power supply control circuit.
Disclosure of Invention
Based on this, in order to solve the problems that the laser power supply control circuit in the prior art is limited in operating efficiency and large in power loss, and the load of the laser heat dissipation management system is increased due to heat generated by power loss, embodiments of the present invention provide a laser power supply control circuit, which can maintain high working efficiency under the condition of different power loads (pump sources), and solve the problem that a DC/DC linear constant current source is large in power loss under the condition of different power loads.
The embodiment of the invention provides a power supply control circuit of a laser, which comprises: the device comprises a pumping source, an AC/DC constant voltage module and a DC/DC linear constant current module electrically connected with the AC/DC constant voltage module, wherein the DC/DC linear constant current module is electrically connected with the pumping source;
the DC/DC linear constant current module comprises: the system comprises an MOS (metal oxide semiconductor) tube, a voltage drop sampling circuit and a control module, wherein the voltage drop sampling circuit is respectively and electrically connected with an electrode D, S of the MOS tube, the control module is electrically connected with the voltage drop sampling circuit, a D electrode of the MOS tube and the control module are both electrically connected with an AC/DC (alternating current/direct current) constant voltage module, and an S electrode of the MOS tube is electrically connected with a pumping source; wherein,
the voltage drop sampling circuit is used for collecting voltage values at two ends of the pole of the MOS tube D, S and feeding the voltage values back to the control module; the control module is used for carrying out logical operation on voltage values at two ends of an MOS tube D, S to obtain a voltage drop value, and feeding the voltage drop value back to the AC/DC constant voltage module, and the AC/DC constant voltage module regulates and controls the magnitude of an output voltage value according to the voltage drop value.
In addition, the invention also provides laser equipment which comprises the laser power supply control circuit.
The invention has the beneficial effects that:
the embodiment of the invention provides a power supply control circuit of a laser, which comprises: the device comprises a pumping source, an AC/DC constant voltage module and a DC/DC linear constant current module electrically connected with the AC/DC constant voltage module, wherein the DC/DC linear constant current module is electrically connected with the pumping source; the DC/DC linear constant current module is internally provided with a voltage drop sampling module, and the voltage values at two ends of the pin D, S of the MOS tube are collected through the voltage drop sampling circuit and are fed back to the control module; furthermore, the control module performs logical operation on voltage values at two ends of the pin D, S of the MOS transistor to obtain a voltage drop value, and feeds the voltage drop value back to the AC/DC constant voltage module, and the voltage drop value of the AC/DC constant voltage module regulates and controls the output voltage value, so that the problem of large power loss in the operation process of the laser power supply control circuit is solved, and the heat dissipation burden of the laser is reduced.
The laser device provided by the embodiment of the invention comprises the laser power supply control circuit, so that the laser device also has the beneficial effect of the laser power supply control circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a power control circuit of a laser in the prior art;
fig. 2 is a block diagram of a power control circuit of a laser according to an embodiment of the present invention;
fig. 3 is a block diagram of a specific structure of a power control circuit of a laser provided in the embodiment of the present invention based on fig. 2;
FIG. 4 is a block diagram based on the specific structure of the DC/DC linear constant current module shown in FIG. 3;
fig. 5 is a schematic circuit diagram of a feedback loop circuit based on the voltage drop sampling module shown in fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "disposed on"/"disposed on" another element, it can be directly on the other element or intervening elements may also be present. In addition, in this specification, the words "first", "second", and "third" do not limit data and execution order, but distinguish substantially the same item or items similar in function and action. The invention performs position definition of a component with reference to the input/output direction of current. For example, in fig. 5, the input current of the D pole of the MOS transistor is input from the input terminal of the resistor R21. It should be noted that "U2" refers to "op-amp IC".
In the prior art, referring to fig. 1, the AC/DC constant voltage module 10 ' is electrically connected to the DC/DC linear constant current source module 20 ', and the DC/DC linear constant current source module 20 ' is electrically connected to a load (a pump source 30 '), wherein the DC/DC linear constant current source module 20 ' includes an MOS transistor, and a constant voltage input by the AC/DC constant voltage module 10 ' is regulated and output by the MOS transistor according to a power requirement of the pump source 30 '. In the process that the MOS transistor is adjusted according to the power required by the load, it is found through practical application that the energy loss of the MOS transistor is small if the power required by the pump source 30 'is full load, and the power loss of the MOS transistor is very large if the power required by the pump source 30' is not full load, such as 50% -70% load. This power loss, while not only wasting electrical energy, also generates significant heat, which places a significant burden on the laser heat dissipation management system. Meanwhile, in order to adapt to different processing materials, the power required by the laser is different, and therefore, it is very important to reduce the power loss of the DC/DC linear constant current source module 20'.
Further, according to experimental verification, when the difference between the input voltage and the output voltage is 0.01V-10V, the DC/DC linear constant current module 20' gradually increases with the power of the load, the voltage difference between the two ends of the D pole and the S pole of the MOS transistor gradually decreases, and the difference between the input power of the D pole of the MOS transistor and the output power of the S pole of the MOS transistor gradually decreases, that is, the power loss gradually decreases. Therefore, according to the actual required power of the pumping source, the voltage value of the input end of the DC/DC linear constant current module 20', that is, the voltage value of the D pole of the MOS transistor, can be adjusted and controlled to effectively reduce the power loss of the MOS transistor.
Accordingly, an embodiment of the present invention provides a power control circuit for a laser, referring to fig. 2, including: the constant current source comprises an AC/DC constant voltage module 10 and a DC/DC linear constant current module 20 electrically connected with the AC/DC constant voltage module 10, wherein the DC/DC linear constant current module 20 is electrically connected with the pumping source 30; wherein, the DC/DC linear constant current module comprises: the system comprises an MOS (metal oxide semiconductor) 201, a voltage drop sampling circuit 202 electrically connected with an MOS D, S pole respectively, and a control module 203 electrically connected with the voltage drop sampling circuit 202, wherein a D pole of the MOS and the control module 203 are both electrically connected with the AC/DC constant voltage module 10, and an S pole of the MOS is electrically connected with the pumping source 30; the voltage drop sampling circuit 202 is configured to collect voltage values at two ends of a pin D, S of the MOS transistor and feed back the voltage values to the control module 203; the control module 203 is configured to perform logical operation on voltage values at two ends of the pin D, S of the MOS transistor to obtain a voltage drop value, and feed the voltage drop value back to the AC/DC constant voltage module 10, where the AC/DC constant voltage module 10 regulates and controls the magnitude of the output voltage value according to the voltage drop value. The control module 203 in the embodiment of the present invention is one of a single chip Microcomputer (MCU), an FPGA, or a CPLD.
Further, referring to fig. 3, in the laser power control circuit according to the embodiment of the present invention, the DC/DC linear constant current module 20 further includes: the laser comprises a second controller 204, a D/A digital-to-analog converter 205, a sampling circuit 206 and an output monitoring terminal 207, wherein the second controller 204 is electrically connected with a G pole of the MOS tube, the second controller 204 is respectively electrically connected with the D/A digital-to-analog converter 205 and the sampling circuit 206, the sampling circuit 206 is electrically connected with the output monitoring terminal 207, and the D/A digital-to-analog converter 205 is used for receiving a standard voltage value required in the laser. In this embodiment, the sampling circuit 206 collects an actual voltage value output from the outside and outputs the actual voltage value to the second controller 204; the D/a dac 205 receives a standard voltage value required by the laser, and the second controller 204 performs a comparison operation on the actual voltage value and the standard voltage value. If the actual voltage value is smaller than the standard voltage value, the second controller 204 increases the G-voltage of the MOS transistor 201; if the actual voltage value is greater than the standard voltage value, the second controller 204 decreases the G-voltage of the MOS transistor. The voltage of the G pole is regulated and controlled by the second controller 204, so as to adjust the on-resistance of the MOS transistor, and control the current passing through the MOS transistor to be constant, that is, the current of the DC/DC linear constant current module 20 to be constant.
In addition, referring to fig. 4, the AC/DC constant voltage module 10 in the laser power control circuit according to the embodiment of the present invention includes: the constant voltage control circuit comprises an input rectifying and filtering circuit 104, an active Power Factor Correction (PFC) circuit 105, a DC/DC converter 106, an output rectifying and filtering circuit 101, a feedback loop circuit 102 and a first controller 103 which are sequentially electrically connected, wherein the first controller 103 is electrically connected with the DC/DC converter 106, the feedback loop circuit 102 is electrically connected with a control module 203, and the output rectifying and filtering circuit 101 is electrically connected with a D pole of an MOS tube, so that the AC/DC constant voltage module 10 realizes the functions of isolation, voltage reduction, voltage stabilization and filtering. The feedback loop circuit 102 is configured to receive the voltage drop value output by the control module 203 and the output voltage value of the output rectifying and filtering circuit 101, and perform comparison operation on the voltage drop value and the output voltage value of the output rectifying and filtering circuit 101, so as to output a feedback voltage value; the first controller 103 is configured to receive the feedback voltage value and output a voltage duty cycle signal according to the feedback voltage value, and the DC/DC converter 106 regulates and controls a voltage duty cycle according to the voltage duty cycle signal.
The first controller 103 and the second controller 204 in the embodiment of the present invention are dsp (digital Signal process) chips.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Referring to fig. 3, a power control circuit of a laser according to an embodiment of the present invention includes: the constant current circuit comprises an AC/DC constant voltage module 10 and a DC/DC linear constant current module 20 electrically connected with the AC/DC constant voltage module 10, wherein the DC/DC linear constant current module 20 is electrically connected with a pumping source 30. Further, with continued reference to fig. 3, the DC/DC linear constant current module 10 includes: the system comprises an MOS (metal oxide semiconductor) 201, a voltage drop sampling circuit 202 electrically connected with an MOS D, S pole respectively, and a control module 203 electrically connected with the voltage drop sampling circuit 202, wherein a D pole of the MOS and the control module 203 are both electrically connected with the AC/DC constant voltage module 10, and an S pole of the MOS is electrically connected with the pumping source 30; the voltage drop sampling circuit 202 is configured to collect voltage values at two terminals of the MOS transistor D, S and feed back the voltage values to the control module 203; the control module 203 is configured to perform logical operation on voltage values at two poles of the MOS transistor D, S to obtain a voltage drop value, and feed the voltage drop value back to the AC/DC constant voltage module 10, where the AC/DC constant voltage module 10 regulates and controls the magnitude of the output voltage value according to the voltage drop value.
Specifically, referring to fig. 4, the AC/DC constant voltage module 10 includes: the laser pumping system comprises an input rectifying and filtering circuit 104, a single-stage active Power Factor Correction (PFC) circuit 105, a DC/DC converter 106, an output rectifying and filtering circuit 101, a feedback loop circuit 102 and a first controller 103 which are sequentially and electrically connected, wherein the output rectifying and filtering circuit 101 is connected with a D pole of an MOS (metal oxide semiconductor) tube and used for supplying power to the laser pumping source 30 after transmitting constant voltage to the DC/DC linear constant current module 20; the feedback loop circuit 102 is electrically connected to the output rectifying and filtering circuit and the control module 203, and is configured to receive the output voltage value of the AC/DC constant voltage module 10 and the voltage drop value output by the control module 203, and compare and operate the output voltage value to output a feedback voltage value; the first controller 103 converts the feedback voltage value into the voltage duty ratio signal according to the feedback voltage value, and the DC/DC converter 106 regulates and controls the magnitude of the output voltage value according to the voltage duty ratio signal.
It should be noted that, in the embodiment of the present invention, the input rectifying and filtering circuit 104, the single-stage active Power Factor Correction (PFC) circuit 105, the DC/DC converter 106, and the output rectifying and filtering circuit 101 are all related art.
Further, the DC/DC linear constant current module 20 further includes: the laser comprises a second controller 204, a D/A digital-to-analog converter 205, a sampling circuit 206 and an output monitoring terminal 207, wherein the second controller 204 is electrically connected with a G pole of the MOS tube, the second controller 204 is respectively electrically connected with the D/A digital-to-analog converter 205 and the sampling circuit 206, the sampling circuit 206 is electrically connected with the output monitoring terminal 207, and the D/A digital-to-analog converter 205 is used for receiving a standard voltage value required in the laser.
In addition, the voltage drop sampling circuit in the embodiment of the present invention includes: a first voltage division circuit (not marked), a first follower circuit (not marked) and a first filter circuit (not marked) which are electrically connected with the MOS transistor D electrode in sequence, wherein the first filter circuit (not marked) is electrically connected with the control module 203; and a second voltage division circuit (not labeled), a second follower circuit (not labeled), and a second filter circuit (not labeled) electrically connected to the S-pole of the MOS transistor in sequence, where the second filter circuit (not labeled) is electrically connected to the control module 203.
Specifically, referring to fig. 5, the first voltage dividing circuit includes: the voltage dividing resistor R11, the voltage dividing resistor R12 and the filter capacitor C11; the input end of the voltage dividing resistor R11 is electrically connected with the S pole output end of the MOS transistor, the input end of the filter capacitor C11 connected with the voltage dividing resistor R12 in parallel is electrically connected with the output end of the voltage dividing resistor R11, and the output end of the filter capacitor C11 connected with the voltage dividing resistor R12 in parallel is grounded; the first follower circuit includes: a first amplifier U2A, a forward end of the first amplifier U2A is electrically connected between an output end of the voltage dividing resistor R11 and input ends of the filter capacitor C11 and the voltage dividing resistor R12, and an inverting end of the first amplifier U2A is connected to an output end of the first amplifier U2A.
The voltage dividing resistors R11 and R12 are used for dividing voltage to protect the first amplifier U2A and the control module 203, and prevent the first amplifier U2A and the control module 203 from being damaged by excessive voltage of the first amplifier U2A and the control module 203.
The first filter circuit includes: the voltage divider resistor R13, the voltage divider resistor R14, the filter capacitor C12, the clamping diode Q11, the clamping diode Q12 and the first power supply; the inverting terminal of the first amplifier U2A is electrically connected with the output terminal thereof and then electrically connected with the input terminal of the voltage dividing resistor R13, the input end of the voltage dividing resistor R14, the input end of the filter capacitor C12 and the negative electrode of the clamping diode Q11 are connected in parallel and then connected with the output end of the voltage dividing resistor R13, the output end of the divider resistor R14, the output end of the filter capacitor C12 and the anode of the clamping diode Q11 are connected in parallel and then grounded, the input end of the voltage dividing resistor R14, the input end of the filter capacitor C12 and the negative electrode of the clamping diode Q11 are connected in parallel and then are connected with the positive electrode of the clamping diode Q12, the negative electrode of the clamping diode Q12 is electrically connected to the first power supply, and the output end of the voltage dividing resistor R13, the input end of the voltage dividing resistor R14, the input end of the filter capacitor C12, the input end of the clamping diode Q11 after being connected in parallel, and the positive electrode of the clamping diode Q12 are commonly connected to the input end of the control module 203.
The voltage dividing resistors R13 and R14 perform voltage dividing function, and can be used to protect the control module 203.
Further, the second voltage dividing circuit includes: the voltage dividing resistor R21, the voltage dividing resistor R22 and the filter capacitor C21; the input end of the voltage dividing resistor R21 is electrically connected with the S pole output end of the MOS transistor, the input end of the filter capacitor C21 connected with the voltage dividing resistor R22 in parallel is electrically connected with the output end of the voltage dividing resistor R21, and the output end of the filter capacitor C21 connected with the voltage dividing resistor R22 in parallel is grounded; the second follower circuit includes: a forward end of the second amplifier U2B is electrically connected between an output end of the voltage dividing resistor R21 and input ends of the filter capacitor C21 and the voltage dividing resistor R22, and an inverting end of the second amplifier U2B is connected to an output end of the second amplifier U2B.
The voltage dividing resistors R21 and R22 are used for dividing voltage, and protecting the second amplifier U2B and the control module 203, so as to prevent the second amplifier U2B and the control module 203 from being damaged by the excessive voltage of the second amplifier U2B and the control module 203.
The second filter circuit includes: the voltage divider resistor R23, the voltage divider resistor R24, the filter capacitor C22, the clamping diode Q21, the clamping diode Q22 and the second power supply; the output end of the second amplifier U2B after the output end and the reverse end are connected is connected with the input end of the divider resistor R23, the input end of the voltage dividing resistor R24, the input end of the filter capacitor C22 and the negative electrode of the clamping diode Q21 are connected in parallel and then connected with the output end of the voltage dividing resistor R23, the output end of the divider resistor R24, the output end of the filter capacitor C22 and the anode of the clamping diode Q21 are connected in parallel and then grounded, the input end of the voltage-dividing resistor R24, the input end of the filter capacitor C22 and the input end after the negative electrode of the clamping diode Q21 is connected in parallel are commonly connected with the positive electrode of the clamping diode Q22, the negative electrode of the clamping diode Q22 is electrically connected to the second power supply, and the output end of the voltage dividing resistor R23, the input end of the voltage dividing resistor R24, the input end of the filter capacitor C22, the input end of the clamping diode Q21 after being connected in parallel, and the positive electrode of the clamping diode Q22 are commonly connected to the input end of the control module 203.
The voltage dividing resistors R23 and R24 perform voltage dividing function, and can be used to protect the control module 203.
Further, the feedback loop circuit 102 includes: third voltage division circuit (not marked), integrator circuit (not marked), third power and opto-coupler 1021, the input of third voltage division circuit with output rectification filter circuit 101 electricity is connected, the output of third voltage division circuit with integrator circuit's reverse end electricity is connected, control module 203 with integrator circuit's forward end electricity is connected, integrator circuit's output with an input electricity of opto-coupler 1021 is connected, another input of opto-coupler 1021 with third power electricity is connected, an output ground connection of opto-coupler 1021, another output of opto-coupler 1021 with first controller 103 electricity is connected.
With continued reference to fig. 5, the third voltage dividing circuit includes: bleeder resistor R32, bleeder resistor R33, bleeder resistor R34, bleeder resistor R32's input with output rectifier filter circuit 101 output electricity is connected, bleeder resistor R32 output and resistance R33 input are established ties, bleeder resistor R33's output electricity is connected ground connection behind the resistance R34, just bleeder resistor R33 with be equipped with first node a between the bleeder resistor R34, integrator circuit's reverse end with first node a electricity is connected.
Further, in order to protect the stability of the feedback loop circuit 102 under the transient loading voltage, in this embodiment, the third voltage dividing circuit may further include: current-limiting resistance R31, divider resistance R35 and instantaneous voltage compensation electric capacity C31, output rectifier filter circuit 101 output with current-limiting resistance R31, instantaneous voltage compensation electric capacity C31 establish ties in proper order, divider resistance R32's input is connected output rectifier filter circuit 101 output with between the current-limiting resistance R31, instantaneous voltage compensation electric capacity C31's output electricity is connected behind the divider resistance R35 with ground connection behind divider resistance R34's the output electricity connection, just instantaneous voltage compensation electric capacity C31 with be equipped with second node b between the divider resistance R35, integrator circuit's reverse end electricity is connected in proper order first node a and second node b. The current limiting resistor R31 is used for prolonging the charging time of the instantaneous voltage compensation capacitor C31.
Further, the integration circuit 102 includes: the integrated circuit comprises an integrator U2C, an integrating capacitor C32 and an integrating capacitor C33, wherein one end of the integrating capacitor C32, which is connected with the integrating capacitor C33 in parallel, is electrically connected with the output end of the integrator U2C, the other end of the integrating capacitor C32 is connected between the reverse end of the integrator U2C and the first node a, and the control module is electrically connected with the forward end of the integrator U2C.
In order to increase the charging time of the integrating capacitor C32, the integrating capacitor C32 may be further connected in series with a current limiting resistor R36, and in order to protect the integrator U2C, the control module 203 may be further electrically connected to the positive end of the integrator U2C through the current limiting resistor R38.
Further, the feedback loop circuit 102 further includes: current-limiting resistor R37, diode Q31, diode Q31's negative pole with integrator U2C's output electricity is connected just resistance R36's output electricity is connected diode Q31 with between integrator U2C's the output, diode Q31's positive pole with the first input (the 1 st pin) electricity of opto-coupler 1021 is connected, the third power with current-limiting resistor R37's input is connected, current-limiting resistor R37's output with the second input (the 2 nd pin) electricity of opto-coupler 1021 is connected, just diode Q31's positive pole electricity is connected current-limiting resistor R37's output and between the second input (the 2 nd pin) of opto-coupler 1021, the first output (the 4 th pin) ground connection of opto-coupler 1021, the second output (the 3 rd pin) of opto-coupler 1021 with first controller 103 electricity is connected.
Further, in order to protect the diode Q31, the feedback loop circuit 102 in this embodiment may further include: a voltage dividing resistor R39, one end of the voltage dividing resistor R39 is electrically connected between the current limiting resistor R37 and the second input end of the optical coupler 1021, and the other end of the voltage dividing resistor R39 is electrically connected between the positive electrode of the diode Q31 and the first input end of the optical coupler 1021.
In this embodiment, the diode Q31, the voltage dividing resistor R39, and the current limiting resistor R37 may all protect the optocoupler 1021 from being burned out.
Specifically, in this embodiment, the optical coupler 1021 includes a light emitting diode (not labeled) and a phototransistor (not labeled), a negative electrode of the light emitting diode is electrically connected to a positive electrode of the Q31 through a 1 st pin, a positive electrode of the light emitting diode is commonly connected to the resistor R37 and the resistor R39 through a 2 nd pin, one end of the phototransistor is electrically connected to the first controller 103 through a 3 rd pin, and the other end of the phototransistor is grounded through a 4 th pin.
In this embodiment, the first power supply, the second power supply, and the third power supply are provided by the power supply control circuit.
The working principle of the embodiment of the invention is as follows:
the AC/DC constant voltage module 10 provides stable voltage to supply power to the DC/DC linear constant current module 20, and the DC/DC linear constant current module 20 supplies power to the pumping source 30 by controlling the voltage; the DC/DC linear constant current module 20 includes an MOS transistor, a D pole of which is electrically connected to the AC/DC constant voltage module 10 for inputting voltage, and an S pole of which is electrically connected to the pump source 30 for outputting voltage. In the process of the laser power control circuit for providing pumping light emitted by the pumping source 30, because the pumping source 30 is not fully loaded in power, voltage drop values exist at the voltage input end and the voltage output end of the MOS transistor, that is, voltage drop values exist at two ends of the D and S poles of the MOS transistor. Therefore, in order to reduce the power loss of the MOS transistor, the voltage drop value across the two terminals of the MOS transistor D and S needs to be adjusted in time to reduce the voltage drop value, so as to reduce the power loss in the laser power control circuit.
Based on this, both ends of the MOS transistor D and the S pole in the DC/DC linear constant current module 20 are respectively electrically connected to the voltage drop sampling circuit 202, and are configured to collect voltage values at both ends of the MOS transistor D and the S pole, and perform logical operation on the voltage values at both ends of the MOS transistor D and the S pole through the control module 203 to obtain the voltage drop value. The voltage drop value is electrically connected with the positive end of the integrator U2C through a resistor R38, and the output rectifying and filtering circuit 101 is electrically connected with the negative end of the integrator U2C through the third voltage division circuit.
If the reverse terminal of the integrator U2C receives a lower voltage value than the forward terminal of the integrator U2C, the voltage outputted from the output terminal of the integrator U2C gradually increases, and at this time, the voltage of the positive electrode of the diode Q31 is still higher than the voltage of the negative electrode, i.e. the diode Q31, is turned on, the light emitting diode in the optocoupler 1021 is turned on, but the current through the light emitting diode gradually decreases, the current of the photo transistor (not labeled) in the optical coupler 1021 decreases, and the voltage value received by the first controller 103 electrically connected to the first output terminal (pin 3) of the optical coupler 1021 increases, and at this time, the voltage duty cycle in the output voltage duty cycle signal of the first controller 103 is decreased, the DC/DC converter 106 regulates the output voltage value to decrease until the positive and negative terminals of the integrator U2C are equal in voltage.
If the voltage value received at the inverting terminal of the integrator U2C is higher than the voltage value received at the forward terminal of the integrator U2C, the voltage outputted from the output terminal of the integrator U2C gradually decreases, at this time, the diode Q31 is turned on, the positive voltage inputted from the third power source is inputted from the second input terminal (pin 2) of the optical coupler 1021 via the current limiting resistor R37, and is output from a first input end (No. 1 pin) of the optical coupler 1021, the current passing through the light emitting diode is increased, the current of a phototransistor (not shown) in the optical coupler 1021 increases, the voltage value received by the first controller 103 electrically connected to the first output terminal (pin 3) of the optical coupler 1021 decreases, the duty ratio of the regulated voltage of the first controller 103 is increased, and the regulated output voltage value of the DC/DC converter 106 is increased until the voltages of the positive terminal and the negative terminal of the integrator U2C are equal.
Compared with the prior art, the embodiment of the invention provides a power control circuit of a laser, which comprises: the constant current source comprises an AC/DC constant voltage module 10 and a DC/DC linear constant current module 20 electrically connected with the AC/DC constant voltage module 10, wherein the DC/DC linear constant current module 20 is electrically connected with the pumping source 30; wherein, the DC/DC linear constant current module comprises: the system comprises an MOS (metal oxide semiconductor) 201, a voltage drop sampling circuit 202 electrically connected with an MOS D, S pole respectively, and a control module 203 electrically connected with the voltage drop sampling circuit 202, wherein a D pole of the MOS and the control module 203 are both electrically connected with the AC/DC constant voltage module 10, and an S pole of the MOS is electrically connected with the pumping source 30; the voltage drop sampling circuit 202 is configured to collect voltage values at two terminals of the MOS transistor D, S and feed back the voltage values to the control module 203; the control module 203 is configured to perform logical operation on voltage values at two ends of the MOS transistor D, S to obtain a voltage drop value, and feed the voltage drop value back to the AC/DC constant voltage module 10, where the AC/DC constant voltage module 10 regulates and controls the magnitude of the output voltage value according to the voltage drop value, thereby solving the problem of large power loss of the power control circuit of the laser and reducing the heat dissipation burden of the laser.
The laser device provided by the embodiment of the invention comprises the laser power supply control circuit, so that the laser device also has the beneficial effect of the laser power supply control circuit.
The above detailed description is provided for a laser power control circuit and a laser device according to the embodiments of the present invention, and the principle and the implementation of the present invention are explained in detail by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A laser power supply control circuit is characterized in that,
the method comprises the following steps: the device comprises a pumping source, an AC/DC constant voltage module and a DC/DC linear constant current module electrically connected with the AC/DC constant voltage module, wherein the DC/DC linear constant current module is electrically connected with the pumping source;
the AC/DC constant voltage module includes: the DC/DC converter, the output rectifying and filtering circuit, the feedback loop circuit and the first controller are electrically connected in sequence, and the first controller is electrically connected with the DC/DC converter;
the DC/DC linear constant current module comprises: the output rectifying filter circuit comprises an MOS (metal oxide semiconductor) tube, a voltage drop sampling circuit and a control module, wherein the voltage drop sampling circuit is respectively and electrically connected with an electrode D, S of the MOS tube, the control module is electrically connected with the voltage drop sampling circuit, a D electrode of the MOS tube is electrically connected with the output rectifying filter circuit, an S electrode of the MOS tube is electrically connected with the pumping source, and the control module is electrically connected with the feedback loop circuit; wherein,
the voltage drop sampling circuit is used for collecting voltage values at two ends of the pole of the MOS tube D, S and feeding the voltage values back to the control module; the control module is used for performing logical operation on voltage values at two ends of the pole of the MOS transistor D, S to obtain a voltage drop value, and feeding the voltage drop value back to the feedback loop circuit, and the feedback loop circuit regulates and controls the magnitude of an output voltage value according to the voltage drop value; the feedback loop circuit includes: a third voltage division circuit, an integrating circuit, a third power supply and an optical coupler,
the input of third voltage division circuit with output rectifier filter circuit electricity is connected, the output of third voltage division circuit with integrator circuit's reverse end electricity is connected, control module with integrator circuit's forward end electricity is connected, integrator circuit's output with an input electricity of opto-coupler is connected, another input of opto-coupler with the third power electricity is connected, an output ground connection of opto-coupler, another output of opto-coupler with first controller electricity is connected.
2. The laser power control circuit of claim 1 wherein the voltage drop sampling circuit comprises:
the first voltage division circuit, the first follower circuit and the first filter circuit are sequentially electrically connected with the S pole of the MOS tube, and the first filter circuit is electrically connected with the control module;
and the second voltage division circuit, the second follower circuit and the second filter circuit are electrically connected with the D pole of the MOS tube in sequence, and the second filter circuit is electrically connected with the control module.
3. The laser power control circuit of claim 2,
the first voltage dividing circuit includes: the voltage dividing resistor R11, the voltage dividing resistor R12 and the filter capacitor C11;
the input end of the voltage dividing resistor R11 is electrically connected with the S pole output end of the MOS transistor, the input end of the filter capacitor C11 connected with the voltage dividing resistor R12 in parallel is electrically connected with the output end of the voltage dividing resistor R11, and the output end of the filter capacitor C11 connected with the voltage dividing resistor R12 in parallel is grounded;
the first follower circuit includes: a first amplifier U2A, wherein the forward end of the first amplifier U2A is electrically connected between the output end of the voltage-dividing resistor R11 and the input end of the filter capacitor C11 and the voltage-dividing resistor R12 which are connected in parallel, and the reverse end of the first amplifier U2A is connected with the output end of the first amplifier U2A;
the first filter circuit includes: the voltage divider resistor R13, the voltage divider resistor R14, the filter capacitor C12, the clamping diode Q11, the clamping diode Q12 and the first power supply;
the inverting terminal of the first amplifier U2A is electrically connected with the output terminal thereof and then electrically connected with the input terminal of the voltage dividing resistor R13, the input end of the voltage dividing resistor R14, the input end of the filter capacitor C12 and the negative electrode of the clamping diode Q11 are connected in parallel and then connected with the output end of the voltage dividing resistor R13, the output end of the divider resistor R14, the output end of the filter capacitor C12 and the anode of the clamping diode Q11 are connected in parallel and then grounded, the input end of the voltage dividing resistor R14, the input end of the filter capacitor C12 and the negative electrode of the clamping diode Q11 are connected in parallel and then are connected with the positive electrode of the clamping diode Q12, the negative electrode of the clamping diode Q12 is electrically connected with the first power supply, and the output end of the voltage dividing resistor R13, the input end of the voltage dividing resistor R14, the input end of the filter capacitor C12, the input end after the negative electrode of the clamping diode Q11 is connected in parallel, and the positive electrode of the clamping diode Q12 are commonly connected with the input end of the control module.
4. The laser power control circuit of claim 3,
the second voltage dividing circuit includes: the voltage dividing resistor R21, the voltage dividing resistor R22 and the filter capacitor C21;
the input end of the voltage dividing resistor R21 is electrically connected with the D pole output end of the MOS transistor, the input end of the filter capacitor C21 connected with the voltage dividing resistor R22 in parallel is electrically connected with the output end of the voltage dividing resistor R21, and the output end of the filter capacitor C21 connected with the voltage dividing resistor R22 in parallel is grounded;
the second follower circuit includes: a second amplifier U2B, wherein a forward end of the second amplifier U2B is electrically connected between an output end of the voltage dividing resistor R21 and input ends of the filter capacitor C21 and the voltage dividing resistor R22 which are connected in parallel, and a reverse end of the second amplifier U2B is connected with an output end of the second amplifier U2B;
the second filter circuit includes: the voltage divider resistor R23, the voltage divider resistor R24, the filter capacitor C22, the clamping diode Q21, the clamping diode Q22 and the second power supply;
the output end of the second amplifier U2B after the output end and the reverse end are connected is connected with the input end of the divider resistor R23, the input end of the voltage dividing resistor R24, the input end of the filter capacitor C22 and the negative electrode of the clamping diode Q21 are connected in parallel and then connected with the output end of the resistor R23, the output end of the divider resistor R24, the output end of the filter capacitor C22 and the anode of the clamping diode Q21 are connected in parallel and then grounded, the input end of the voltage dividing resistor R24, the input end of the filter capacitor C22 and the negative electrode of the clamping diode Q21 are connected in parallel and then are connected with the positive electrode of the clamping diode Q22, the negative electrode of the clamping diode Q22 is electrically connected with the second power supply, and the output end of the voltage dividing resistor R23, the input end of the voltage dividing resistor R24, the input end of the filter capacitor C22, the input end after the negative electrode of the clamping diode Q21 is connected in parallel, and the positive electrode of the clamping diode Q22 are commonly connected with the input end of the control module.
5. The laser power control circuit of claim 1,
the AC/DC constant voltage module further includes: the input rectifying filter circuit and the active Power Factor Correction (PFC) circuit are electrically connected in sequence, and the active Power Factor Correction (PFC) circuit is electrically connected with the DC/DC converter.
6. The laser power control circuit of claim 5,
the third voltage dividing circuit includes: a voltage dividing resistor R32, a voltage dividing resistor R33, a voltage dividing resistor R34,
the input end of the voltage-dividing resistor R32 is electrically connected with the output end of the output rectifying and filtering circuit, the output end of the voltage-dividing resistor R32 is connected with the input end of the voltage-dividing resistor R33 in series, the output end of the voltage-dividing resistor R33 is electrically connected with the voltage-dividing resistor R34 and then grounded, a first node a is arranged between the output end of the voltage-dividing resistor R33 and the input end of the voltage-dividing resistor R34, and the reverse end of the integrating circuit is electrically connected with the first node a;
the integration circuit includes: the control module comprises an integrator U2C, an integrating capacitor C32 and an integrating capacitor C33, wherein one end of the integrating capacitor C32, which is connected with the integrating capacitor C33 in parallel, is electrically connected with the output end of the integrator U2C, the other end of the integrating capacitor C32 is connected between the reverse end of the integrator U2C and the first node a, and the control module is electrically connected with the forward end of the integrator U2C;
the feedback loop circuit further comprises: the negative electrode of the diode Q31 is electrically connected with the output end of the integrator U2C, one end of the integration capacitor C32, which is connected with the integration capacitor C33 in parallel, is electrically connected between the negative electrode of the diode Q31 and the output end of the integrator U2C, the positive electrode of the diode Q31 is electrically connected with the first input end of the optocoupler, the third power supply is connected with the input end of the current-limiting resistor R37, the output end of the current-limiting resistor R37 is electrically connected with the second input end of the optocoupler, the positive electrode of the diode Q31 is electrically connected between the output end of the current-limiting resistor R37 and the second input end of the optocoupler, the first output end of the optocoupler is grounded, and the second output end of the optocoupler is electrically connected with the first controller.
7. The laser power control circuit of claim 6,
the third voltage dividing circuit further includes: a current-limiting resistor R31, a voltage-dividing resistor R35 and an instantaneous voltage compensation capacitor C31, wherein an output end of the output rectifying filter circuit is sequentially connected in series with the current-limiting resistor R31 and the instantaneous voltage compensation capacitor C31, an input end of the voltage-dividing resistor R32 is connected between the output end of the output rectifying filter circuit and the current-limiting resistor R31, an output end of the instantaneous voltage compensation capacitor C31 is connected to be electrically connected to an input end of the voltage-dividing resistor R35, an output end of the voltage-dividing resistor R35 is electrically connected to an output end of the voltage-dividing resistor R34 and then grounded, a second node b is arranged between the instantaneous voltage compensation capacitor C31 and the input end of the voltage-dividing resistor R35, and an inverting end of the integrator U2C is sequentially electrically connected to the first node a and the second node b;
the feedback loop circuit further comprises: current-limiting resistor R36, current-limiting resistor R38, divider resistor R39, current-limiting resistor R36 with integral capacitor C32 connects in series, control module passes through current-limiting resistor R38 with integrator U2C's forward end electricity is connected, divider resistor R39 one end electricity is connected current-limiting resistor R37's output with between the opto-coupler second input, the other end electricity of divider resistor R39 is connected diode Q31's positive pole and between the opto-coupler first input.
8. The laser power control circuit of any of claims 1-7, wherein the DC/DC linear constant current module comprises: the second controller is electrically connected with the G pole of the MOS tube, the second controller is respectively electrically connected with the D/A digital-to-analog converter and the sampling circuit, and the sampling circuit is electrically connected with the output monitoring terminal.
9. A laser device comprising a laser power control circuit as claimed in any one of claims 1 to 8.
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| CN117595067B (en) * | 2024-01-18 | 2024-04-02 | 深圳市吉斯迪科技有限公司 | Constant-current power supply circuit of capacitor energy-storage pulse laser |
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