CN116093893B - Constant-current driving protection circuit, laser pumping system and constant-current driving protection method - Google Patents

Constant-current driving protection circuit, laser pumping system and constant-current driving protection method Download PDF

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Publication number
CN116093893B
CN116093893B CN202310365093.7A CN202310365093A CN116093893B CN 116093893 B CN116093893 B CN 116093893B CN 202310365093 A CN202310365093 A CN 202310365093A CN 116093893 B CN116093893 B CN 116093893B
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resistor
linear
tube
constant current
operational amplifier
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CN116093893A (en
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王建廷
康海震
杨俊锋
张振伟
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Shenzhen Lianming Power Supply Co ltd
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Shenzhen Lianming Power Co ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Protection Of Static Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a constant current drive protection circuit, a laser pumping system and a constant current drive protection method. The overcurrent protection module obtains a second electric parameter reflecting the current flowing through the linear regulating tube, and controls the cutting-off and the conducting of the input current of the linear regulating tube according to the second electric parameter, so that the overcurrent protection of the linear regulating tube is realized. Through this kind of setting, can realize carrying out overcurrent protection and power protection simultaneously to linear regulation pipe, avoid linear regulation pipe overcurrent damage or power too big damage.

Description

Constant-current driving protection circuit, laser pumping system and constant-current driving protection method
Technical Field
The invention relates to the technical field of power supplies, in particular to a constant current driving protection circuit, a laser pumping system and a constant current driving protection method.
Background
Because of the self attribute of the LED, the pumping source and other devices, constant current driving is needed to ensure safe and reliable work, and therefore, a constant current regulating device for constant current regulation is arranged in a main circuit where the LED, the pumping source and other devices are positioned. The linear regulating tube is a commonly adopted constant current regulating device, the linear regulating tube in the main circuit is generally connected with devices such as an LED or a pumping source, and constant current regulation is realized by regulating a driving signal of the linear regulating tube.
The traditional constant current driving protection scheme is to collect an electric parameter reflecting the magnitude of current flowing through the linear regulating tube, and when the electric parameter reflects the excessive current flowing through the linear regulating tube, the power supply of the main circuit is turned off, so that a loop of the main circuit is disconnected, and the linear regulating tube is subjected to overcurrent protection. Since the linear regulator is used in a specific device (e.g., pump source), the maximum power loss of the linear regulator is not at a point where the self-current flow is at a maximum.
Therefore, there are situations that the linear regulator tube is damaged due to excessive power when the linear regulator tube is not protected by overcurrent, and the conventional constant current driving protection scheme can only provide single overcurrent protection at present and cannot provide power protection for the linear regulator tube.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the constant current driving protection circuit, the laser pumping system and the constant current driving protection method are provided to solve the problem that the existing constant current driving protection scheme cannot provide overcurrent protection and power protection for the constant current driving circuit at the same time.
In order to solve the technical problems, the invention adopts the following technical scheme:
a constant current drive protection circuit comprising:
a linear adjusting tube;
the power protection module is connected with the linear regulating tube and used for obtaining a first electric parameter reflecting the power of the linear regulating tube and controlling the on-off of the linear regulating tube according to the first electric parameter; and
and the overcurrent protection module is connected with the linear regulation tube and is used for acquiring a second electric parameter reflecting the current of the linear regulation tube and cutting off or conducting the input current of the linear regulation tube according to the second electric parameter.
Further, the power protection module includes:
one end of the sampling resistor is connected with the source electrode of the linear regulating tube, and the other end of the sampling resistor is grounded;
the anode of the controllable silicon element is connected with the grid electrode of the linear adjusting tube, and the cathode of the controllable silicon element is grounded;
the first differential amplifying unit is connected with the sampling resistor and used for obtaining the voltages at two ends of the sampling resistor and taking the voltages as a first reference voltage after differential amplification;
the voltage acquisition unit is connected with the drain electrode of the linear regulation tube and used for acquiring the voltage between the drain electrode and the source electrode of the linear regulation tube and taking the voltage as a second reference voltage;
the first operation unit is electrically connected with the first differential amplifying unit and the voltage acquisition unit respectively and is used for acquiring the first reference voltage and the second reference voltage and multiplying the first reference voltage and the second reference voltage to acquire the first electric parameter; and
the second operation unit is respectively connected with the first operation unit and the grid electrode of the controllable silicon element, and is used for comparing the first electrical parameter with a first preset voltage threshold value and controlling the on-off of the controllable silicon element according to a comparison result.
Further, the first differential amplifying unit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier;
one end of the first resistor is connected with one end of the sampling resistor, and the other end of the first resistor is connected with the negative input end of the first operational amplifier;
one end of the second resistor is grounded, and the other end of the second resistor is connected with the positive input end of the first operational amplifier;
one end of the third resistor is connected with the positive input end of the first operational amplifier, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with the negative input end of the first operational amplifier, and the other end of the fourth resistor is connected with the output end of the first operational amplifier.
Further, the voltage acquisition unit comprises a fifth resistor, one end of the fifth resistor is connected with the drain electrode of the linear adjusting tube, and the other end of the fifth resistor is connected with the first operation unit.
Further, the first operation unit comprises a multiplier, a first input end of the multiplier is connected with the voltage acquisition unit, a second input end of the multiplier is connected with the first differential amplification unit, and an output end of the multiplier is connected with the second operation unit.
Further, the second operation unit comprises a first comparator, the negative input end of the first comparator is connected with a first preset voltage threshold, the positive input end of the first comparator is connected with the first operation unit, and the output end of the first comparator is connected with the grid electrode of the silicon controlled element.
Further, the overcurrent protection module includes:
the drain electrode of the first field effect tube is connected with a power supply current, and the source electrode of the first field effect tube is connected with the drain electrode of the linear regulating tube;
the second differential amplification unit is connected with the sampling resistor and is used for collecting the voltages at two ends of the sampling resistor and carrying out differential amplification so as to obtain the second electrical parameter;
the third operation unit is connected with the second differential amplification unit and is used for comparing the second electric parameter with a second preset voltage threshold value and outputting a comparison result; and
and the optical coupling isolation unit is respectively connected with the third operation unit and the grid electrode of the first field effect transistor and is used for controlling the on-off of the first field effect transistor according to the comparison result of the third operation unit.
Further, the second differential amplifying unit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a second operational amplifier, the third operational unit comprises a second comparator and a tenth resistor, and the optocoupler isolation unit comprises an optocoupler isolator, an eleventh resistor and a twelfth resistor;
one end of the sixth resistor is connected with one end of the sampling resistor, and the other end of the sixth resistor is connected with the negative input end of the second operational amplifier;
one end of the seventh resistor is connected with the positive input end of the second operational amplifier, and the other end of the seventh resistor is grounded;
one end of the eighth resistor is connected with the positive input end of the second operational amplifier, and the other end of the eighth resistor is grounded;
one end of the ninth resistor is connected with the negative input end of the second operational amplifier, and the other end of the ninth resistor is connected with the output end of the second operational amplifier;
one end of the tenth resistor is connected with the negative input end of the second comparator, and the other end of the tenth resistor is connected with the output end of the second operational amplifier;
the positive input end of the second comparator is connected with the second preset voltage threshold value, and the output end of the second comparator is connected with the positive electrode of the opto-coupler isolator;
the negative electrode of the optocoupler isolator is connected with one end of the eleventh resistor, the other end of the eleventh resistor is grounded, the collector electrode of the optocoupler isolator is connected with auxiliary voltage, the emitter electrode of the optocoupler isolator is connected with the grid electrode of the first field effect transistor, one end of the twelfth resistor is connected with the emitter electrode of the optocoupler isolator, and the other end of the twelfth resistor is grounded.
A laser pumping system comprising a main circuit and a constant current drive protection circuit as claimed in any one of the preceding claims;
the main circuit is provided with a pumping source, the positive electrode of the pumping source is connected with the overcurrent protection module, the power supply current is accessed through the overcurrent protection module, and the negative electrode of the pumping source is connected with the linear regulating tube.
A constant current drive protection method applied to the constant current drive protection circuit according to any one of the above, the constant current drive protection method comprising the steps of:
acquiring a first electric parameter reflecting the power of the linear regulating tube;
comparing the first electrical parameter with a first preset voltage threshold value, and controlling the on-off of the linear regulating tube according to a comparison result;
acquiring a second electrical parameter reflecting the current of the linear regulating tube;
and comparing the second electric parameter with a second preset voltage threshold value, and cutting off or conducting the input current of the linear regulating tube according to a comparison result.
The invention has the beneficial effects that: the application provides a constant current driving protection circuit and a constant current driving protection method, wherein the constant current driving protection circuit is provided with a power protection module and an overcurrent protection module, and the overcurrent protection module obtains a second electric parameter reflecting the current of a linear regulation tube and cuts off or conducts the input current of the linear regulation tube according to the second electric parameter so as to realize the overcurrent protection of the linear regulation tube. Meanwhile, the power protection module acquires a first electric parameter reflecting the power of the linear regulating tube, and controls the on-off of the linear regulating tube according to the first electric parameter so as to realize the power protection of the linear regulating tube. Therefore, the constant current drive protection circuit is beneficial to realizing the over-current protection and the power protection of the constant current regulating device (linear regulating tube) at the same time.
Drawings
FIG. 1 is a schematic block diagram of a constant current drive protection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a laser pumping system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the V-I characteristic of a laser pump source;
FIG. 4 is a schematic diagram of the loss versus current characteristic of a linear regulator tube;
FIG. 5 is a schematic diagram of a constant current drive protection circuit according to an embodiment of the present invention;
FIG. 6 is a first flow chart of a constant current driving protection method according to an embodiment of the present invention;
fig. 7 is a second flowchart of a constant current driving protection method according to an embodiment of the present invention.
Description of the reference numerals:
10. a main circuit; 20. a constant current drive protection circuit; 200. an overcurrent protection module; 210. a second differential amplifying unit; 220. a third operation unit; 230. an optical coupling isolation unit; 300. a power protection module; 310. a first differential amplifying unit; 320. a voltage acquisition unit; 330. a first arithmetic unit; 340. and a second arithmetic unit.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Examples
Referring to fig. 1, 2 and 5, the present embodiment provides a constant current driving protection circuit 20 to protect a linear regulator Q2.
Referring to fig. 1, the constant current driving protection circuit includes a linear regulator Q2, a power protection module 300, and an overcurrent protection module 200. The power protection module 300 is connected with the linear adjusting tube Q2, and is configured to obtain a first electrical parameter reflecting the power of the linear adjusting tube Q2, and control on-off of the linear adjusting tube Q2 according to the first electrical parameter. The overcurrent protection module 200 is connected to the linear regulator Q2, and is configured to obtain a second electrical parameter reflecting the current of the linear regulator Q2, and cut off or conduct the input current of the linear regulator Q2 according to the second electrical parameter.
The working principle of the constant current driving protection circuit 20 of the present embodiment is as follows: the power protection module 300 obtains a first electric parameter reflecting the power of the linear regulating tube Q2, when the first electric parameter reaches or exceeds a numerical value in a normal state, the current power of the linear regulating tube Q2 is judged to be too high, and the power protection module 300 enables the linear regulating tube Q2 to be closed by adjusting a driving signal of a grid electrode of the linear regulating tube Q2, so that the linear regulating tube Q2 is prevented from being damaged due to too high power consumption. The overcurrent protection module 200 obtains a second electrical parameter reflecting the magnitude of the current flowing through the linear adjusting tube Q2, and when the second electrical parameter reaches or exceeds a value in a normal state, the current flowing through the linear adjusting tube Q2 is judged to be too high, and the overcurrent protection module 200 cuts off the input current of the linear adjusting tube Q2, so that the damage caused by the too large current flowing through the linear adjusting tube Q2 is avoided.
Referring to fig. 2 and 5, the linear regulator Q2 of the present embodiment is illustratively applied to a laser pumping system, in which a pumping source is connected to a linear regulator in a main circuit 10. The linear regulating tube Q2 is connected with an external driving signal and responds to the driving signal to perform constant current regulation on the main circuit.
Referring to fig. 3, fig. 3 shows a V-I characteristic of a pump source, and it can be seen that the voltage requirements of the pump source are different when different currents are output from the pump source. The main function of the linear constant current source is to control the linear regulating tube Q2 to work in a linear region so as to meet the requirement of providing constant current for the pumping source of the laser. Since the voltage v+ at the input of the main circuit is fixed, the voltage drop imposed on the linear regulator tube is also different at different current outputs.
Referring to fig. 4, fig. 4 is a schematic diagram of the current and the loss on the linear regulator Q2, wherein the triangle curve is a schematic curve of the current, and the parabola-like curve is a schematic curve of the loss of the linear regulator Q2. As can be seen from fig. 4, the loss of Q2 on the linear regulator tube is a parabolic change trend during the increase of the output current, and the loss of Q2 on the linear regulator tube is maximum when the output current is maximum, but not when the output current is maximum, but when the output current is nearly half, which is also caused by the self characteristics of the laser pumping source.
It can be appreciated that the constant current driving protection circuit of the present embodiment realizes the overcurrent protection and the power protection of the linear regulator Q2 at the same time by providing the overcurrent protection module 200 and the power protection module 300, so as to avoid the overcurrent damage or the power overload damage of the linear regulator Q2. In other embodiments, the constant current driving protection circuit may be applied to other circuits or systems that require constant current regulation devices, which are not limited herein.
Referring to fig. 2 and 5, the power protection module 300 includes a sampling resistor RS1, a first differential amplifying unit 310, a voltage collecting unit 320, a thyristor S1A, a first computing unit 330 and a second computing unit 340.
One end of the sampling resistor RS1 is connected with the source electrode of the linear regulating tube Q2, and the other end of the sampling resistor RS1 is grounded. The anode of the silicon controlled element S1A is connected with the grid electrode of the linear adjusting tube Q2, and the cathode of the silicon controlled element S1A is grounded. The first differential sampling unit is connected with the sampling resistor RS1 and is used for acquiring voltages at two ends of the sampling resistor RS1 and taking the voltages as a first reference voltage after differential amplification. The voltage acquisition unit 320 is connected to the drain of the linear regulator Q2, and is configured to acquire a voltage between the drain and the source of the linear regulator Q2 and serve as a second reference voltage. The first operation unit 330 is electrically connected to the first differential amplifying unit 310 and the voltage collecting unit 320, and is configured to obtain the first reference voltage and the second reference voltage, and multiply the first reference voltage and the second reference voltage to obtain the first electrical parameter. The second operation unit 340 is respectively connected to the first operation unit 330 and the gate of the scr element S1A, and is configured to compare the first electrical parameter with a first preset voltage threshold, and control on-off of the scr element S1A according to a comparison result.
It can be understood that the sampling resistor RS1 is a current sampling resistor RS1 of the linear regulator Q2, and the first differential sampling unit obtains voltages at two ends of the sampling resistor RS1 and performs differential amplification to obtain a first reference voltage, where the first reference voltage is an electrical parameter reflecting the magnitude of the current flowing through the sampling resistor RS1, that is, an electrical parameter reflecting the magnitude of the current flowing through the source electrode of the linear regulator Q2. The voltage acquisition unit 320 acquires the voltage of the drain-gate of the linear regulator Q2 as a second reference voltage, and the first operation unit 330 obtains a first electrical parameter reflecting the power of the linear regulator Q2 by multiplying or dividing the first reference voltage and the second reference voltage. The second operation unit 340 obtains the first electrical parameter, and compares the first electrical parameter with a first preset voltage threshold, and outputs a comparison result to the gate of the scr element S1A to control on/off of the scr element S1A.
For example, the first preset voltage threshold may be set to a value corresponding to the rated power or the maximum power of the linear-adjusting tube Q2, without limitation. The silicon controlled element S1A is a high-power electrical element, also called a thyristor, and has the advantages of small volume, high efficiency, long service life and the like. As another example, when the first electrical parameter reaches or exceeds the first preset voltage threshold, the second operation unit 340 outputs the comparison result to the thyristor S1A, so that the thyristor S1A is turned on, and the gate voltage of the linear regulator Q2 is pulled down, so that the linear regulator Q2 exits the linear region, enters the turn-off region, and stops working, thereby realizing the power protection of the linear regulator Q2.
Referring to fig. 5, the first differential amplifying unit 310 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first operational amplifier U1. One end of the first resistor R1 is connected to one end of the sampling resistor RS1, and the other end of the first resistor R1 is connected to the negative input end of the first operational amplifier U1. One end of the second resistor R2 is grounded, and the other end of the second resistor R2 is connected with the positive input end of the first operational amplifier U1. One end of the third resistor R3 is connected with the positive input end of the first operational amplifier U1, and the other end of the third resistor R3 is grounded. One end of the fourth resistor R4 is connected to the negative input end of the first operational amplifier U1, and the other end of the fourth resistor R4 is connected to the output end of the first operational amplifier U1.
It can be understood that the first operational amplifier U1 differentially amplifies the voltages at both ends of the sampling resistor RS1 to obtain the first reference voltage Vf1.
Illustratively, the voltage collecting unit 320 includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the drain of the linear regulator Q2, and the other end of the fifth resistor R5 is connected to the first operation unit 330.
As can be appreciated, the fifth resistor R5 is a voltage dividing resistor, and the drain-source voltage of the linear regulator Q2 is collected as the second reference voltage Vf2 through the fifth resistor R5, and the second reference voltage Vf2 is sent to the first operation unit 330.
Illustratively, the first operation unit 330 includes a multiplier U2, a first input terminal of the multiplier U2 is connected to the voltage acquisition unit 320, a second input terminal of the multiplier U2 is connected to the first differential amplification unit 310, and an output terminal of the multiplier U2 is connected to the second operation unit 340. The other end of the fifth resistor R5 is connected to the first input end of the multiplier U2, the second input end of the multiplier U2 is connected to the first differential amplifier, and the multiplier U2 multiplies the first reference voltage Vf1 and the second reference voltage Vf2 to obtain the first electrical parameter.
The second operation unit 340 includes a first comparator U3, a negative input end of the first comparator U3 is connected to a first preset voltage threshold, a positive input end of the first comparator U3 is connected to the first operation unit 330, and an output end of the first comparator U3 is connected to the gate of the thyristor S1A. The positive input end of the first comparator U3 is connected with the output end of the multiplier U2.
Referring to fig. 2, the over-current protection module 200 includes a first fet Q1, a second differential amplifying unit 210, a third operational amplifying unit, and an optocoupler isolation unit 230. The drain electrode of the first field effect tube Q1 is connected with a power supply current, and the source electrode of the first field effect tube Q1 is connected with the drain electrode of the linear regulating tube Q2. The second differential amplifying unit is connected with the sampling resistor RS1 and is used for collecting voltages at two ends of the sampling resistor RS1 and performing differential amplification so as to obtain the second electrical parameter. The third operation unit 220 is connected to the second differential amplifying unit 210, and is configured to compare the second electrical parameter with a second preset voltage threshold, and output a comparison result. The optocoupler isolation unit 230 is respectively connected to the third operation unit 220 and the gate of the first fet Q1, and is configured to control on/off of the first fet Q1 according to a comparison result of the third operation unit 220.
It can be understood that the second differential amplifying unit 210 collects the voltages at two ends of the sampling resistor RS1 and obtains a second electrical parameter after differential amplifying, where the second electrical parameter is an electrical parameter reflecting the magnitude of the current flowing through the sampling resistor RS1, that is, an electrical parameter reflecting the magnitude of the source current of the linear regulator Q2. In other embodiments, the overcurrent protection module 200 and the power protection module 300 may use only the same differential amplifying unit, which is not limited herein. In this embodiment, the third operation unit 220 obtains the second electrical parameter, and compares the second electrical parameter with a second preset voltage threshold, and outputs the comparison result to the optocoupler isolation unit 230. The optocoupler isolation unit 230 adjusts the driving signal of the first fet Q1 in response to the comparison result of the third operation unit 220.
For example, the second preset voltage threshold may be set to a value corresponding to the rated current or the maximum current of the linear regulator Q2, without limitation. Also illustratively, when the second electrical parameter reaches or exceeds the second preset voltage threshold, it is determined that the linear regulator Q2 is over-current, and the third operation unit 220 outputs the comparison result to the optocoupler isolation unit 230, and the optocoupler isolation unit 230 controls the first field effect transistor Q1 to be turned off, so as to implement over-current protection of the linear regulator Q2. The power protection module 300 and the overcurrent protection module 200 of the present embodiment jointly use a single sampling resistor RS1, so that the number of sampling resistors RS1 can be reduced, and the cost of the constant current driving protection circuit 20 can be reduced.
With continued reference to fig. 5, the second differential amplifying unit 210 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a second operational amplifier U4, the third operational unit 220 includes a second comparator U5 and a tenth resistor R10, and the optocoupler isolation unit 230 includes an optocoupler OP1, an eleventh resistor R11, and a twelfth resistor R12.
One end of the sixth resistor R6 is connected to one end of the sampling resistor RS1, and the other end of the sixth resistor R6 is connected to the negative input end of the second operational amplifier U4. One end of the seventh resistor R7 is connected with the positive input end of the second operational amplifier U4, and the other end of the seventh resistor R7 is grounded. One end of the eighth resistor R8 is connected to the positive input end of the second operational amplifier U4, and the other end of the eighth resistor R8 is grounded. One end of the ninth resistor R9 is connected to the negative input end of the second operational amplifier U4, and the other end of the ninth resistor R9 is connected to the output end of the second operational amplifier U4. One end of the tenth resistor R10 is connected to the negative input end of the second comparator U5, and the other end of the tenth resistor R10 is connected to the output end of the second operational amplifier U4. The positive input end of the second comparator U5 is connected to the second preset voltage threshold Vref2, and the output end of the second comparator U5 is connected to the positive electrode of the optocoupler isolator OP 1. The negative electrode of the optocoupler isolator OP1 is connected with one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is grounded, the collector electrode of the optocoupler isolator OP1 is connected with an auxiliary voltage VA+, the emitter electrode of the optocoupler isolator OP1 is connected with the grid electrode of the first field effect transistor Q1, one end of the twelfth resistor R12 is connected with the emitter electrode of the optocoupler isolator OP1, and the other end of the twelfth resistor R12 is grounded. The auxiliary voltage va+ connected to the collector of the optocoupler isolator OP1 may be provided by the power supply of the main circuit 10.
It can be understood that the voltage values at two ends of the sampling resistor RS1 are differentially amplified by the second operational amplifier U4 and then output to the second comparator U5, and compared with the second preset voltage threshold Vref2 by the second comparator U5, when the voltage output by the second operational amplifier U4 reaches or exceeds the second voltage preset threshold, the second comparator U5 outputs a low level to the optocoupler isolator OP1, so that the optocoupler isolator OP1 is turned off, and the gate voltage of the first field effect transistor Q1 is pulled down, so that the first field effect transistor Q1 is turned off, thereby enabling the main circuit 10 to disconnect the loop and realizing the overcurrent protection of the linear regulator Q2.
Illustratively, the constant current driving protection circuit 20 further includes a Microcontroller (MCU) electrically connected to the first two units and the third operation unit 220, respectively, for providing the first preset voltage threshold Vref1 to the second operation unit 340 and the second preset voltage threshold Vref2 to the third operation unit 220. The microcontroller can perform variable adjustment on the first preset voltage threshold Vref1 according to linear constant current sources of different power sections and linear adjustment Q2 pipes of different heat dissipation powers, so that the flexibility of constant current driving protection is improved.
In this embodiment, specific circuits of the overcurrent protection module 200 and the power protection module 300 may be adjusted according to actual requirements, and are not limited to the implementation manner of this embodiment.
Examples
Referring to fig. 2, the present embodiment provides a laser pumping system, which includes a main circuit 10 and a constant current driving protection circuit 20 as described in embodiment one.
The main circuit 10 is provided with a pump source LD1, wherein the positive electrode of the pump source LD1 is connected with the overcurrent protection module 200, and is connected with a power supply current through the overcurrent protection module 200, and the negative electrode of the pump source LD1 is connected with the linear regulating tube Q2.
It can be understood that the linear regulator Q2 performs constant current regulation on the main circuit 10, and meanwhile, the constant current driving protection circuit 20 performs power protection and overcurrent protection on the linear regulator Q2 through the power protection module 300 and the overcurrent protection module 200, so as to improve the stability of the main circuit 10, thereby making the laser pumping system safer and more reliable.
Examples
Referring to fig. 6 and 7, the present embodiment provides a constant current driving protection method, which is applied to the constant current driving protection circuit in the laser pumping system of the first embodiment.
Referring to fig. 6, the constant current driving protection method includes the steps of:
s10, acquiring a first electric parameter reflecting the power of the linear regulating tube;
s20, comparing the first electrical parameter with a first preset voltage threshold value, and controlling the on-off of the linear regulating tube according to a comparison result;
s30, obtaining a second electric parameter reflecting the current of the linear regulating tube;
s40, comparing the second electric parameter with a second preset voltage threshold value, and cutting off or conducting the input current of the linear regulating tube according to a comparison result.
Wherein, step 10 and step 30 may be real-time parallel steps, which is not limited herein.
Specifically, step S10 includes:
s11, providing a sampling resistor, wherein the source electrode of the linear regulating tube is grounded through the sampling resistor;
s12, collecting voltages at two ends of the sampling resistor, and performing differential amplification to obtain a first reference voltage;
s13, collecting the voltage between the drain electrode and the source electrode of the linear regulating tube as a second reference voltage;
s14, calculating the first reference voltage and the second reference voltage to obtain a first electric parameter reflecting the power of the linear regulating tube.
It can be understood that in the constant current driving protection method of this embodiment, an electrical parameter reflecting the magnitude of the current flowing through the linear regulator tube is obtained through the sampling resistor, and the electrical parameter is differentially amplified to obtain the first reference voltage. Meanwhile, the drain electrode-source electrode voltage of the linear regulating tube is obtained to serve as a second reference voltage, and the first reference voltage and the second reference voltage are calculated to obtain a first electric parameter reflecting the power of the linear regulating tube. Providing a first preset voltage threshold, comparing the first electric parameter with the first preset voltage threshold, and controlling the on-off of the linear regulating tube according to the comparison result.
In an exemplary embodiment, when the first electrical parameter reaches or exceeds a first preset voltage threshold, it is determined that the power of the linear regulator tube is too high, and the linear regulator tube is controlled to be turned off, so as to achieve power protection of the linear regulator tube.
The constant current driving protection method of the embodiment further comprises the steps of obtaining a second electrical parameter reflecting the magnitude of the current flowing through the linear adjusting tube, comparing the second electrical parameter with a second preset voltage threshold value, and controlling the on-off of the first field effect tube according to a comparison result.
In an exemplary embodiment, when the second electrical parameter reaches or exceeds the second preset voltage threshold, the linear regulator tube is judged to be over-current, and the first field effect tube is controlled to be turned off, so that the loop is disconnected, and over-current protection of the linear regulator tube is realized.
In summary, the constant current driving protection circuit, the laser pumping system and the constant current driving protection method provided by the invention are provided with the power protection module and the overcurrent protection module, wherein the overcurrent protection module obtains the second electric parameter reflecting the current of the linear regulating tube, and controls the on-off of the first field effect tube according to the first electric parameter so as to realize the overcurrent protection of the linear regulating tube. Meanwhile, the power protection module acquires a first electric parameter reflecting the power of the linear regulating tube, and controls the on-off of the linear regulating tube according to the first electric parameter so as to realize the power protection of the linear regulating tube. Therefore, the constant current drive protection circuit is beneficial to realizing the over-current protection and the power protection of the constant current regulating device (linear regulating tube) at the same time.
In addition, the first preset voltage threshold value can be adjusted, and the flexibility of constant current driving protection is improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant technical field, are included in the scope of the present invention.

Claims (9)

1. A constant current drive protection circuit, characterized by comprising:
the linear regulating tube is used for being connected with the pumping source;
the power protection module is connected with the linear regulating tube and used for obtaining a first electric parameter reflecting the power of the linear regulating tube and controlling the on-off of the linear regulating tube according to the first electric parameter; and
the overcurrent protection module is connected with the linear regulation tube and used for acquiring a second electric parameter reflecting the current of the linear regulation tube and cutting off or conducting the input current of the linear regulation tube according to the second electric parameter;
the power protection module includes:
one end of the sampling resistor is connected with the source electrode of the linear regulating tube, and the other end of the sampling resistor is grounded;
the anode of the controllable silicon element is connected with the grid electrode of the linear adjusting tube, and the cathode of the controllable silicon element is grounded;
the first differential amplifying unit is connected with the sampling resistor and used for obtaining the voltages at two ends of the sampling resistor and taking the voltages as a first reference voltage after differential amplification; wherein the first reference voltage reflects the parameter of the source current of the linear regulating tube;
the voltage acquisition unit is connected with the drain electrode of the linear regulation tube and used for acquiring the voltage between the drain electrode and the source electrode of the linear regulation tube and taking the voltage as a second reference voltage;
the first operation unit is electrically connected with the first differential amplifying unit and the voltage acquisition unit respectively and is used for acquiring the first reference voltage and the second reference voltage and multiplying the first reference voltage and the second reference voltage to acquire the first electric parameter; and
the second operation unit is respectively connected with the first operation unit and the grid electrode of the controllable silicon element, and is used for comparing the first electrical parameter with a first preset voltage threshold value and controlling the on-off of the controllable silicon element according to a comparison result; when the first electrical parameter reaches or exceeds a first preset voltage threshold, the second operation unit controls the controllable silicon element to be conducted so as to control the linear regulating tube to stop working.
2. The constant current drive protection circuit according to claim 1, wherein the first differential amplifying unit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier;
one end of the first resistor is connected with one end of the sampling resistor, and the other end of the first resistor is connected with the negative input end of the first operational amplifier;
one end of the second resistor is grounded, and the other end of the second resistor is connected with the positive input end of the first operational amplifier;
one end of the third resistor is connected with the positive input end of the first operational amplifier, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with the negative input end of the first operational amplifier, and the other end of the fourth resistor is connected with the output end of the first operational amplifier.
3. The constant current drive protection circuit according to claim 1, wherein the voltage acquisition unit includes a fifth resistor, one end of the fifth resistor is connected to the drain of the linear regulator tube, and the other end of the fifth resistor is connected to the first arithmetic unit.
4. The constant current drive protection circuit according to claim 1, wherein the first operation unit includes a multiplier, a first input terminal of the multiplier is connected to the voltage acquisition unit, a second input terminal of the multiplier is connected to the first differential amplification unit, and an output terminal of the multiplier is connected to the second operation unit.
5. The constant current drive protection circuit according to claim 1, wherein the second operation unit comprises a first comparator, a negative input end of the first comparator is connected to a first preset voltage threshold, a positive input end of the first comparator is connected to the first operation unit, and an output end of the first comparator is connected to a gate of the silicon controlled element.
6. The constant current drive protection circuit according to claim 1, wherein the overcurrent protection module includes:
the drain electrode of the first field effect tube is connected with a power supply current, and the source electrode of the first field effect tube is connected with the drain electrode of the linear regulating tube;
the second differential amplification unit is connected with the sampling resistor and is used for collecting the voltages at two ends of the sampling resistor and carrying out differential amplification so as to obtain the second electrical parameter;
the third operation unit is connected with the second differential amplification unit and is used for comparing the second electric parameter with a second preset voltage threshold value and outputting a comparison result; and
and the optical coupling isolation unit is respectively connected with the third operation unit and the grid electrode of the first field effect transistor and is used for controlling the on-off of the first field effect transistor according to the comparison result of the third operation unit.
7. The constant current drive protection circuit according to claim 6, wherein the second differential amplifying unit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a second operational amplifier, the third operational unit includes a second comparator and a tenth resistor, and the optocoupler isolation unit includes an optocoupler isolator, an eleventh resistor, and a twelfth resistor;
one end of the sixth resistor is connected with one end of the sampling resistor, and the other end of the sixth resistor is connected with the negative input end of the second operational amplifier;
one end of the seventh resistor is connected with the positive input end of the second operational amplifier, and the other end of the seventh resistor is grounded;
one end of the eighth resistor is connected with the positive input end of the second operational amplifier, and the other end of the eighth resistor is grounded;
one end of the ninth resistor is connected with the negative input end of the second operational amplifier, and the other end of the ninth resistor is connected with the output end of the second operational amplifier;
one end of the tenth resistor is connected with the negative input end of the second comparator, and the other end of the tenth resistor is connected with the output end of the second operational amplifier;
the positive input end of the second comparator is connected with the second preset voltage threshold value, and the output end of the second comparator is connected with the positive electrode of the opto-coupler isolator;
the negative electrode of the optocoupler isolator is connected with one end of the eleventh resistor, the other end of the eleventh resistor is grounded, the collector electrode of the optocoupler isolator is connected with auxiliary voltage, the emitter electrode of the optocoupler isolator is connected with the grid electrode of the first field effect transistor, one end of the twelfth resistor is connected with the emitter electrode of the optocoupler isolator, and the other end of the twelfth resistor is grounded.
8. A laser pumping system comprising a main circuit and a constant current drive protection circuit as claimed in any one of claims 1 to 7;
the main circuit is provided with a pumping source, the positive electrode of the pumping source is connected with the overcurrent protection module, the power supply current is accessed through the overcurrent protection module, and the negative electrode of the pumping source is connected with the linear regulating tube.
9. A constant current drive protection method, characterized by being applied to the constant current drive protection circuit according to any one of claims 1 to 7, comprising the steps of:
acquiring a first electric parameter reflecting the power of the linear regulating tube;
comparing the first electrical parameter with a first preset voltage threshold value, and controlling the on-off of the linear regulating tube according to a comparison result;
acquiring a second electrical parameter reflecting the current of the linear regulating tube;
and comparing the second electric parameter with a second preset voltage threshold value, and cutting off or conducting the input current of the linear regulating tube according to a comparison result.
CN202310365093.7A 2023-04-07 2023-04-07 Constant-current driving protection circuit, laser pumping system and constant-current driving protection method Active CN116093893B (en)

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