High-frequency controllable seed light pumping amplification driver and driving circuit

Abstract

The invention discloses a high-frequency controllable seed light pumping amplification driver and a driving circuit, and the driver comprises an interactive touch display module which is used for carrying out the interactive operation with the driver; the numerical control constant current module is used for generating driving current; the pulse modulation module is used for realizing high-frequency controllable and high-resolution pulse modulation; the numerical control compatible module is used for realizing compatibility with amplifiers of different models; the power supply module is used for supplying power to the whole driving system; the temperature control module is used for adjusting the working temperature of the amplifier; the external driving interface is used for connecting an amplifier to be driven; and the main control chip is used for respectively controlling the numerical control constant current module, the pulse modulation module, the numerical control compatible module and the temperature control module. According to the high-frequency controllable seed optical pumping amplification driver and the driving circuit, the problem that the driving current is unstable during high-frequency modulation can be solved, and meanwhile stable amplification is achieved by being compatible with different kinds of seed optical pumping amplifiers in a numerical control mode.

Description

Technical Field

[0001] The invention relates to the technical field of seed light pumping amplification driving technology, and in particular to a high-frequency controllable seed light pumping amplification driver and a driving circuit. Background Art

[0002] In experimental research, seed light pumped amplifiers are widely used in the field of optics, and higher and higher requirements are placed on the amplifier's driving system. Performance such as modulation frequency, driving current, and driving stability have greatly restricted the operability of the experiment. The design schemes of existing products have various problems during use. The existing driving schemes are almost not perfectly compatible with the design requirements of high-frequency modulation and large-current stable driving. Some schemes adopt external modulation but will affect the size of the constant current, which is not suitable for experimental scenarios with high precision requirements. Therefore, how to design a driving system that can achieve high-precision, high-frequency modulation, digitally controlled stable amplification, and is compatible with various seed light pumped amplifiers has become a major challenge. Summary of the invention

[0003] The purpose of the present invention is to provide a high-frequency controllable seed light pumping amplifier driver and driving circuit, which can solve the problem of unstable driving current during high-frequency modulation, and at the same time achieve stable amplification by being compatible with different types of seed light pumping amplifiers through digital control.

[0004] To achieve the above-mentioned purpose, the present invention provides a high-frequency controllable seed light pumped amplifier driver and driving circuit, including an interactive touch display module for displaying and setting the driving current size, pulse modulation frequency, rough estimated internal resistance of the amplifier to be compatible, and constant operating temperature of the amplifier; Digitally controlled constant current module, used to generate driving current; Pulse modulation module, used to achieve high-frequency controllable and high-resolution pulse modulation without changing the driving current; Digital control compatible module, used to achieve compatibility with amplifiers of different models and ensure stable current drive; Power module, used to supply power to the entire drive system; Temperature control module, used to adjust the operating temperature of the amplifier; External drive interface, used to connect the amplifier to be driven; The main control chip is used to control the numerical control constant current module, the pulse modulation module, the numerical control compatible module and the temperature control module respectively according to the setting of the interactive touch display module.

[0005] Preferably, the main control chip is connected to the interactive touch display module, the CNC constant current module, the CNC compatible module, the pulse modulation module, the power module and the temperature control module respectively, and the external drive interface is connected to the pulse modulation module.

[0006] Preferably, the digitally controlled constant current module includes a digital-to-analog conversion circuit and a voltage-controlled constant current circuit, and the main control chip controls the digital-to-analog conversion circuit to generate the required corresponding voltage value, and controls the voltage-controlled constant current circuit to generate a stable constant driving current.

[0007] Preferably, the pulse modulation module is divided into an external modulation part and an internal modulation part, the internal modulation part includes a signal generator and a high-frequency constant current switching circuit, and the external modulation part provides an external signal input interface; the external modulation part and the internal modulation part use jumper caps for function switching.

[0008] Preferably, the CNC compatible module includes a digital potentiometer and a measurement feedback circuit.

[0009] A high-frequency controllable seed light pumping amplification driving circuit comprises a digital-analog output unit, a voltage-controlled constant current unit, a high-frequency constant current modulation unit and a measurement feedback unit which are connected in sequence.

[0010] Preferably, the digital-to-analog output unit includes an operational amplifier U1, a voltage divider resistor R1, a precision resistor R2 and a precision resistor R3; The non-inverting input terminal of the operational amplifier U1 is connected to the voltage output terminal of the DAC through a voltage-dividing resistor R1, the reverse input terminal of the operational amplifier U1 is grounded through a precision resistor R2, the reverse input terminal and the output terminal of the operational amplifier U1 are connected through a precision resistor R3, and the output terminal of the operational amplifier U1 is connected to the voltage-controlled constant current unit.

[0011] Preferably, the voltage-controlled constant current unit includes an operational amplifier U2, an operational amplifier U3, a precision resistor R4, a precision resistor R5, a precision resistor R6 and a precision resistor R7; The non-inverting input terminal of the operational amplifier U2 is connected to the voltage output terminal of the digital-to-analog output unit through a precision resistor R4, and the reverse input terminal of the operational amplifier U2 is grounded through a precision resistor R5; the output terminal of the operational amplifier U2 is connected to the precision resistor R6, and the rear end of the precision resistor R6 is connected to the high-frequency constant current modulation unit, and the rear end node of the precision resistor R6 is also connected to the non-inverting input terminal of the operational amplifier U3; the reverse input terminal and output terminal of the operational amplifier U3 are connected, and are connected to the non-inverting input terminal of the operational amplifier U2 through a precision resistor R7.

[0012] Preferably, the high-frequency constant current modulation unit includes a MOS tube M1, a MOS tube M2, a diode D1, a signal generator and an external signal input interface; The current output end of the voltage-controlled constant current unit is connected to the drain of the MOS tube M1, the gate of the MOS tube M1 is connected to the drain of the MOS tube M2, the gate of the MOS tube M2 is connected to the modulation signal source, the modulation signal source is switched to the signal generator and the external signal input interface respectively by a jumper cap, and the sources of the MOS tube M1 and the MOS tube M2 are both grounded; the current output end of the voltage-controlled constant current unit is connected to the measurement feedback unit through a diode D1.

[0013] Preferably, the measurement feedback unit comprises a digital potentiometer and a potential comparator, and both the digital potentiometer and the potential comparator are connected to the output end of the diode D1.

[0014] Therefore, the beneficial effects of the present invention using the above-mentioned high-frequency controllable seed light pump amplifier driver and driving circuit are as follows: (1) The present invention effectively solves the problem of unstable driving current during high-frequency modulation.

[0015] (2) The present invention can realize high-frequency modulation of the output current while achieving stable output of large current.

[0016] (3) The present invention adopts digital control to achieve large-range and high-precision control of current and modulation frequency.

[0017] (4) The present invention is compatible with different types of seed light pump amplifiers to ensure the driving effect.

[0018] (5) Compared with the commonly used integrated chip solutions and high-frequency MOS solutions, the present invention has better performance, lower cost and can meet higher requirements.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a high-frequency controllable seed light pumping amplifier driver of the present invention; Figure 2 It is a schematic diagram of a high-frequency controllable seed light pumping amplification driving circuit of the present invention; Figure 3 The present invention is a flowchart of a high-frequency controllable seed light pumping amplifier driver. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Embodiment 1 like Figure 1 As shown, the present invention provides a high-frequency controllable seed light pumping amplifier driver, including an interactive touch display module, a digital control constant current module, a pulse modulation module, a digital control compatible module, a power module, a temperature control module, an external drive interface and a main control chip.

[0024] The power module is connected to the main control chip to supply power to the entire drive system. The interactive touch display module is connected to the main control chip to display and set the drive current, pulse modulation frequency, rough internal resistance of the compatible amplifier, constant operating temperature of the amplifier, and control the working state of the drive system. The interactive touch display module can use input display devices such as LCD touch screens, and the main control chip can use chips including but not limited to STM32, FPGA, etc.

[0025] In this embodiment, the digital control constant current module is connected to the main control chip and controlled by the main control chip, including a digital-to-analog conversion circuit and a voltage-controlled constant current circuit, which are used to generate a controllable, stable, wide-range, and high-resolution driving current. The main control chip controls the digital-to-analog conversion circuit to generate the required corresponding voltage value, and controls the voltage-controlled constant current circuit to generate a stable constant driving current. The main control chip controls the digital-to-analog conversion circuit to perform digital-to-analog conversion and voltage conversion according to the driving current set by the above-mentioned interactive touch display module, and generates the required corresponding voltage value. The voltage-controlled constant current circuit generates a corresponding stable constant driving current according to the voltage value generated by the digital-to-analog conversion circuit.

[0026] It should be noted that the main control chip should control the DAC output digital-to-analog conversion circuit to generate a specific analog voltage value according to demand, and generate the voltage value required by the voltage-controlled constant current circuit through the operational amplifier circuit, so as to achieve a one-to-one correspondence between the control voltage and the drive current, thereby achieving precise control of the drive current.

[0027] The pulse modulation module is divided into an external modulation part and an internal modulation part. The internal modulation part includes a signal generator and a high-frequency constant current switching circuit. The external modulation part provides an external signal input interface for realizing high-frequency controllable and high-resolution pulse modulation without changing the driving current.

[0028] The external modulation part and the internal modulation part use jumper caps to switch functions. The signal generator generates a square wave signal of a specific frequency according to the pulse modulation frequency set by the above-mentioned interactive touch display module. The high-frequency constant current switch circuit turns on and off the constant current source according to the square wave signal generated by the signal generator.

[0029] It should be noted that the difference between the external modulation part and the internal modulation part is only the different signal sources of the modulation, and the modulation principle of the signal is the same. The high-frequency constant current switch circuit can ensure that the driving current remains stable under the premise of high-frequency modulation, thereby realizing stable amplification of the seed source. The internal nodes of the high-frequency constant current switch circuit are brought out through the interface for connecting to an external amplifier for driving.

[0030] The CNC compatible module is connected to the main control chip and controlled by the main control chip, including a digital potentiometer and a measurement feedback circuit, which is used to achieve compatibility with amplifiers of different models and ensure stable current drive. The digital potentiometer sets its own resistance value according to the rough estimated internal resistance of the amplifier to be compatible set by the above-mentioned interactive touch display module, and the measurement feedback circuit determines the potential size and feeds back the result to the main control chip to realize fine adjustment of the digital potentiometer.

[0031] It should be noted that the digital potentiometer is configured with resistance by the main control chip through SPI and other methods. The measurement feedback circuit judges the potential of the high voltage end of the digital potentiometer and the preset voltage value, and feeds the result back to the main control chip. The main control chip makes fine adjustments based on the feedback result to match amplifiers with different internal resistances and achieve stable operation of different amplifiers. The configuration of the digital potentiometer only occurs in the initialization stage of changing the amplifier. The main control chip records the setting status and uses the last setting value by default each time it is used.

[0032] The temperature control module is connected to the main control chip and controlled by the main control chip, and is used to adjust the operating temperature of the amplifier. The main control chip sets the temperature control module according to the constant operating temperature of the amplifier set by the above-mentioned interactive touch display module, and controls the temperature of the amplifier. It is worth noting that the temperature control module can also be composed of external modules, which are controlled by the main control chip through a communication interface such as SPI.

[0033] The external drive interface is connected to the pulse modulation module and is used to connect the amplifier to be driven. It is led out from the node in the high-frequency constant current switch circuit and can be connected to the drive base of the external amplifier, such as the butterfly package test fixture of the amplifier, to provide the modulated drive current to the external amplifier.

[0034] like Figure 2 As shown, this embodiment also provides a high-frequency controllable seed light pumping amplifier driving circuit, including a digital-to-analog output unit, a voltage-controlled constant current unit, a high-frequency constant current modulation unit and a measurement feedback unit connected in sequence.

[0035] The digital-to-analog output unit includes an operational amplifier U1, a voltage divider resistor R1, a precision resistor R2, and a precision resistor R3. The same-direction input terminal of the operational amplifier U1 is connected to the voltage output terminal of the DAC through the voltage divider resistor R1, the reverse input terminal of the operational amplifier U1 is grounded through the precision resistor R2, the reverse input terminal and the output terminal of the operational amplifier U1 are connected through the precision resistor R3, and the output terminal of the operational amplifier U1 is connected to the voltage-controlled constant current unit. The operational amplifier U1 cooperates with two precision resistors to amplify the voltage output by the DAC to obtain the required voltage, and the precision resistor is responsible for setting a specific amplification factor.

[0036] The voltage-controlled constant current unit includes an operational amplifier U2, an operational amplifier U3, a precision resistor R4, a precision resistor R5, a precision resistor R6 and a precision resistor R7, and can generate a specific constant current according to the voltage value output by the digital-to-analog output unit for use by the back-end circuit.

[0037] The supply voltage of the operational amplifier U2 and the operational amplifier U3 can determine the maximum range of the output constant current. The same-direction input terminal of the operational amplifier U2 is connected to the voltage output terminal of the digital-to-analog output unit through the precision resistor R4, and the reverse input terminal of the operational amplifier U2 is grounded through the precision resistor R5. The output terminal of the operational amplifier U2 is connected to the precision resistor R6, the rear end of the precision resistor R6 is connected to the high-frequency constant current modulation unit, and the rear end node of the precision resistor R6 is also connected to the same-direction input terminal of the operational amplifier U3. The reverse input terminal of the operational amplifier U3 is connected to the output terminal, and is connected to the same-direction input terminal of the operational amplifier U2 through the precision resistor R7. Through the above connection, a large range, high precision, and high resolution constant current output can be achieved.

[0038] The high-frequency constant current modulation unit includes a MOS tube M1, a MOS tube M2, a diode D1, a signal generator and an external signal input interface. The current output end of the voltage-controlled constant current unit is connected to the drain of the MOS tube M1, the gate of the MOS tube M1 is connected to the drain of the MOS tube M2, the gate of the MOS tube M2 is connected to the modulation signal source, the modulation signal source is switched to the signal generator and the external signal input interface respectively by a jumper cap, the source of the MOS tube M1 and the MOS tube M2 are both grounded, and the current output end of the voltage-controlled constant current unit is connected to the measurement feedback unit through the diode D1.

[0039] Diode D1 is responsible for filtering the reverse current, and a high-frequency diode can be selected. The connection method of the MOS tube solves the problem that the driving current is affected by the discharge of the internal capacitor in the MOS, and achieves the accuracy of the driving current without affecting the high-frequency conditions.

[0040] The measurement feedback unit includes a digital potentiometer and a potentiometer comparator, both of which are connected to the output end of the diode D1. When a new device is connected, the digital potentiometer sets the resistance value according to the rough estimated resistance value, and the potentiometer comparator compares the set voltage value with the measured voltage value, and feeds back the measurement result to the main control chip. The measurement feedback unit can improve the stability of the output current. This ensures that the drive system is compatible with other amplifiers.

[0041] It is worth noting that the potentiometer comparator compares the magnitude between the high voltage end of the digital potentiometer and the preset voltage, which is obtained by specific tests and provided by the voltage division of the power supply circuit.

[0042] like Figure 3 As shown, when the seed light pump amplifier driver in this embodiment is connected to a new device, it enters the initialization configuration state, inputs the rough internal resistance of the seed light amplifier to be driven, waits for the internal digital control compatible module to be automatically compatible, and records the digital potentiometer state, waiting for the next direct call. In the working state of the device, turn on the device, automatically configure the digital potentiometer state, and the touch interface displays the setting interface of the drive current and modulation frequency. After the setting is completed, click output to output current, and click close to close the output.

[0043] Therefore, the present invention adopts the above-mentioned high-frequency controllable seed light pumping amplifier driver and driving circuit, which can solve the problem of unstable driving current during high-frequency modulation, and at the same time, it is compatible with different types of seed light pumping amplifiers through digital control to achieve stable amplification.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A high-frequency controllable seed light pump amplifier driver, characterized in that: It includes an interactive touch display module for displaying and setting the drive current, pulse modulation frequency, rough internal resistance of the amplifier to be compatible, and constant operating temperature of the amplifier; Digital control constant current module, used to generate driving current; Pulse modulation module, used to achieve high-frequency controllable and high-resolution pulse modulation without changing the driving current; Digital control compatible module, used to achieve compatibility with amplifiers of different models and ensure stable current drive; Power module, used to supply power to the entire drive system; Temperature control module, used to adjust the operating temperature of the amplifier; External drive interface, used to connect the amplifier to be driven; The main control chip is used to control the numerical control constant current module, the pulse modulation module, the numerical control compatible module and the temperature control module respectively according to the setting of the interactive touch display module.

2. A high-frequency controllable seed light pump amplifier driver and driving circuit according to claim 1, characterized in that: The main control chip is connected to the interactive touch display module, the numerical control constant current module, the numerical control compatible module, the pulse modulation module, the power module and the temperature control module respectively, and the external drive interface is connected to the pulse modulation module.

3. The high-frequency controllable seed light pump amplifier driver and driving circuit according to claim 1, characterized in that: The digital control constant current module includes a digital-to-analog conversion circuit and a voltage-controlled constant current circuit. The main control chip controls the digital-to-analog conversion circuit to generate the required corresponding voltage value, and controls the voltage-controlled constant current circuit to generate a stable constant driving current.

4. The high-frequency controllable seed light pump amplifier driver and driving circuit according to claim 1, characterized in that: The pulse modulation module is divided into an external modulation part and an internal modulation part. The internal modulation part includes a signal generator and a high-frequency constant current switch circuit. The external modulation part provides an external signal input interface. The external modulation part and the internal modulation part use jumper caps for function switching.

5. The high-frequency controllable seed light pump amplifier driver and driving circuit according to claim 1, characterized in that: The CNC compatible module includes a digital potentiometer and a measurement feedback circuit.

6. A high-frequency controllable seed light pumping amplifier driving circuit, characterized in that: The invention comprises a digital-analog output unit, a voltage-controlled constant current unit, a high-frequency constant current modulation unit and a measurement feedback unit which are connected in sequence.

7. The high-frequency controllable seed light pumping amplification driving circuit according to claim 6, characterized in that: The digital-to-analog output unit includes an operational amplifier U1, a voltage divider resistor R1, a precision resistor R2 and a precision resistor R3; The non-inverting input terminal of the operational amplifier U1 is connected to the voltage output terminal of the DAC through a voltage-dividing resistor R1, the reverse input terminal of the operational amplifier U1 is grounded through a precision resistor R2, the reverse input terminal and the output terminal of the operational amplifier U1 are connected through a precision resistor R3, and the output terminal of the operational amplifier U1 is connected to the voltage-controlled constant current unit.

8. The high-frequency controllable seed light pumping amplification driving circuit according to claim 6, characterized in that: The voltage-controlled constant current unit includes an operational amplifier U2, an operational amplifier U3, a precision resistor R4, a precision resistor R5, a precision resistor R6 and a precision resistor R7; The non-inverting input terminal of the operational amplifier U2 is connected to the voltage output terminal of the digital-to-analog output unit through a precision resistor R4, and the reverse input terminal of the operational amplifier U2 is grounded through a precision resistor R5; the output terminal of the operational amplifier U2 is connected to the precision resistor R6, and the rear end of the precision resistor R6 is connected to the high-frequency constant current modulation unit, and the rear end node of the precision resistor R6 is also connected to the non-inverting input terminal of the operational amplifier U3; the reverse input terminal and output terminal of the operational amplifier U3 are connected, and are connected to the non-inverting input terminal of the operational amplifier U2 through a precision resistor R7.

9. The high-frequency controllable seed light pumping amplification driving circuit according to claim 6, characterized in that: The high-frequency constant current modulation unit includes a MOS tube M1, a MOS tube M2, a diode D1, a signal generator and an external signal input interface; The current output end of the voltage-controlled constant current unit is connected to the drain of the MOS tube M1, the gate of the MOS tube M1 is connected to the drain of the MOS tube M2, the gate of the MOS tube M2 is connected to the modulation signal source, the modulation signal source is switched to the signal generator and the external signal input interface respectively by a jumper cap, and the sources of the MOS tube M1 and the MOS tube M2 are both grounded; the current output end of the voltage-controlled constant current unit is connected to the measurement feedback unit through a diode D1.

10. The high-frequency controllable seed light pumping amplification driving circuit according to claim 9, characterized in that: The measurement feedback unit includes a digital potentiometer and a potential comparator, and both the digital potentiometer and the potential comparator are connected to the output end of the diode D1.

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