Driving detection circuit

Abstract

The utility model relates to a driving detection circuit which is used for being connected with a laser, a driving voltage control circuit in the driving detection circuit is used for outputting driving voltage, and a voltage driving circuit is used for performing operational amplification on the driving voltage output by the driving voltage control circuit and then outputting the driving voltage; the pumping source driving circuit comprises a switching tube, the input end of the switching tube is connected with a pumping source of the laser, the control end of the switching tube is connected with the output end of the voltage driving circuit, and the output end of the switching tube is grounded; the current sampling circuit is connected with the output end of the switching tube and is used for sampling the current of the pumping source; the current detection circuit is used for detecting the sampling current output by the current sampling circuit, and the current detection circuit is further connected with the driving voltage control circuit and used for providing the sampling current for the driving voltage control circuit. Therefore, the current detection function of the pumping source can be added in the driving circuit of the laser, the driving voltage of the laser is further controlled based on the detection result, and the pumping source can effectively output stable power.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and in particular to a driving detection circuit. Background Art

[0002] With the development of laser technology, lasers have been widely used. For example, they are used in communications, energy, military industry, imaging technology, detection and detection technology, etc. During the use of lasers, the pump source needs to be driven by a driving circuit.

[0003] The driving circuit of a conventional laser drives the pump source of the laser according to a driving voltage of a fixed voltage value, resulting in instability in the output power of the pump source of the laser. Utility Model Content

[0004] Based on this, it is necessary to provide a driving detection circuit for connecting to the laser to address the above technical problems, which can add a current detection function of the pump source in the driving circuit of the laser, and then control the driving voltage of the laser based on the detection result, which can effectively make the pump source output stable power.

[0005] A driving detection circuit for a laser comprises: a driving voltage control circuit for outputting a driving voltage; a voltage driving circuit connected to the driving voltage control circuit for performing operational amplification on the driving voltage output by the driving voltage control circuit and then outputting a pump source driving circuit, wherein the pump source driving circuit comprises a switch tube, wherein the input end of the switch tube is connected to a pump source of the laser, the control end of the switch tube is connected to the output end of the voltage driving circuit, and the output end of the switch tube is grounded; a current sampling circuit connected to the output end of the switch tube for sampling the current of the pump source; a current detection circuit connected to the current sampling circuit for detecting a sampling current output by the current sampling circuit, and the current detection circuit is also connected to the driving voltage control circuit for providing a sampling current to the driving voltage control circuit, so that the driving voltage control circuit outputs a driving voltage based on the sampling current.

[0006] In one embodiment, the driving voltage control circuit includes a microcontroller chip and a voltage output chip. The microcontroller chip is integrated with a voltage control circuit, the voltage control circuit is used to output a voltage control value of the driving voltage, and the voltage output chip is used to output the driving voltage; the voltage control circuit in the microcontroller chip is connected to the voltage output chip; and the voltage output chip is connected to the voltage driving circuit.

[0007] In one of the embodiments, the driving voltage control circuit further includes a voltage reference chip, which is connected to the voltage output chip and is used to provide a reference voltage for the voltage output chip.

[0008] In one of the embodiments, a sampling current detection circuit is also integrated in the microcontroller chip; the current detection circuit includes the sampling current detection circuit in the microcontroller chip, and the sampling current detection circuit in the microcontroller chip is connected to the current sampling circuit.

[0009] In one embodiment, the voltage driving circuit includes a first operational amplifier, the non-inverting input terminal of the first operational amplifier is connected to the output terminal of the driving voltage control circuit, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is also connected to the control terminal of the switching tube.

[0010] In one embodiment, the voltage driving circuit further includes a first resistor, and the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier through the first resistor; and / or, the voltage driving circuit further includes a first capacitor, and the first capacitor is connected in parallel with the first resistor.

[0011] In one embodiment, the pump source driving circuit also includes a second operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the output terminal of the voltage driving circuit, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is also connected to the control terminal of the switching tube.

[0012] In one embodiment, the pump source driving circuit further includes a second resistor, and the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier through the second resistor; and / or, the pump source driving circuit further includes a second capacitor, and the second capacitor is connected in parallel with the second resistor.

[0013] In one embodiment, the current sampling circuit includes a sampling resistor, one end of the sampling resistor is connected to the output end of the switch tube, and the other end of the sampling resistor is grounded.

[0014] In one embodiment, the current sampling circuit also includes a third operational amplifier and a fourth operational amplifier; the non-inverting input terminal of the third operational amplifier is connected to one end of the sampling resistor, and the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier; the output terminal of the third operational amplifier is connected to the non-inverting input terminal of the fourth operational amplifier; the inverting input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier, and the output terminal of the fourth operational amplifier is also connected to the current detection circuit.

[0015] The above-mentioned driving detection circuit is used to connect with the laser, including: a driving voltage control circuit for outputting a driving voltage; a voltage driving circuit connected to the driving voltage control circuit for outputting the driving voltage output by the driving voltage control circuit after operational amplification; a pump source driving circuit, the pump source driving circuit including a switch tube, the input end of the switch tube is connected to the pump source of the laser, the control end of the switch tube is connected to the output end of the voltage driving circuit, and the output end of the switch tube is used for grounding; a current sampling circuit connected to the output end of the switch tube for detecting the sampling current output by the current sampling circuit, and the current detection circuit is also connected to the driving voltage control circuit for providing a sampling current to the driving voltage control circuit, so that the driving voltage control circuit outputs a driving voltage based on the sampling current. Therefore, the current detection function of the pump source can be added to the driving circuit of the laser, and then the driving voltage of the laser can be controlled based on the detection result, which can effectively make the pump source output stable power. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural block diagram of a driving detection circuit of the present application in one embodiment;

[0017] Figure 2 A schematic diagram of a microcontroller chip of the present application in one embodiment;

[0018] Figure 3 A schematic diagram of a voltage output chip of the present application in one embodiment;

[0019] Figure 4 A schematic diagram of a voltage reference chip of the present application in one embodiment;

[0020] Figure 5 is a circuit diagram of a voltage driving circuit of the present application in one embodiment;

[0021] Figure 6 A circuit diagram of a pump source driving circuit of the present application in one embodiment;

[0022] Figure 7 is a first partial circuit diagram of a current sampling circuit of the present application in one embodiment;

[0023] Figure 8 FIG. 1 is a second partial circuit diagram of the current sampling circuit of the present application in one embodiment. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] The present application provides a driving detection circuit for connecting to a laser. In one embodiment, Figure 1 As shown, a driving detection circuit includes a driving voltage control circuit 102, a voltage driving circuit 104, a pump source driving circuit 106, a current sampling circuit 108 and a current detection circuit 110 which are connected in sequence with electrical signals. Specifically, as Figure 1 As shown, the driving voltage control circuit 102 is used to output the driving voltage to the voltage driving circuit 104. The voltage driving circuit 104 performs an operational amplifier on the driving voltage and then outputs it to the pump source driving circuit 106. Figure 1 As shown, the pump source driving circuit 106 includes a switch tube, the input end of the switch tube is connected to the pump source of the laser, the control end of the switch tube is connected to the output end of the voltage driving circuit 104, and the output end of the switch tube is used for grounding. That is, the driving voltage output after the operational amplifier of the voltage driving circuit 104 is used to drive the switch tube to turn on and off. When the control end of the switch tube is turned on, the switch tube is turned on. The conduction current of the switch tube is controlled by the driving voltage connected to the control end of the switch tube. Therefore, the pump source of the laser can be driven by the voltage driving circuit 104.

[0026] like Figure 1 As shown, the current sampling circuit 108 is connected to the output end of the switch tube for sampling the current of the pump source. The current detection circuit 110 is used to detect the sampling current output by the current sampling circuit 108 and provide the sampling current to the driving voltage control circuit 102, so that the driving voltage control circuit 102 outputs the driving voltage based on the sampling current. Therefore, it is possible to add a detection circuit to the driving circuit of the pump source of the laser, and adjust the output driving voltage based on the detected current control of the pump source, so that the output power of the pump source tends to be stable.

[0027] Specifically, the switch tube can be a MOS tube. The drain of the MOS tube is connected to the pump source of the laser, the gate of the MOS tube is connected to the output end of the voltage driving circuit, and the source of the MOS tube is used for grounding; the current sampling circuit is connected to the source of the MOS tube for sampling the current of the pump source.

[0028] Those skilled in the art can understand that although the switch tube in this embodiment can be a MOS tube, this is only exemplary. For example, the switch tube in this embodiment can also be at least one of a BJT tube and an IGBT tube.

[0029] In one embodiment, the driving voltage control circuit includes a microcontroller chip and a voltage output chip. The microcontroller chip is integrated with a voltage control circuit. The voltage control circuit in the microcontroller chip is used to output a voltage control value of the driving voltage. The voltage output chip is used to output the driving voltage. The voltage control circuit in the microcontroller chip is connected to the voltage output chip. The voltage output chip is connected to the voltage driving circuit. The driving voltage control circuit also includes a voltage reference chip. The voltage reference chip is connected to the voltage output chip and is used to provide a reference voltage for the voltage output chip.

[0030] In this embodiment, the microcontroller chip is Figure 2 The U4A chip shown is S1M32F103VE16. The voltage output chip is Figure 3 The U41 chip shown is DAC8554. Figure 2 and Figure 3 As shown in FIG. 1 , the PA4 pin, PA5 pin, PA6 pin and PA7 pin corresponding to the MCU control part of the U4A chip are respectively connected to the DIN pin, SCLK pin, SYNC pin and ENABLE pin of the corresponding U41 chip. Therefore, the U4A chip can control the voltage value of the driving voltage output by the U41 chip. The voltage reference chip is as follows Figure 4 The U39 chip shown is model number REFO2CSZ-REEL7. Figure 3 and Figure 4 As shown, the VOUT pin in the U39 chip is connected to the VREFH pin and the AVDD pin of the U41 chip. Therefore, the U39 chip can provide a stable reference voltage for the U41 chip.

[0031] Specifically, the U4A chip controls the output drive voltage of the U41 chip through the SPI bus. The model of the U41 chip is DAC8554, and its parameters include:

[0032] Resolution: 16 bits; relative accuracy: ±4LSB; output impedance: 1Ω; power supply voltage (AVDD): 2.7V~5.5V; reference voltage (VREF): 0~AVDD; output voltage: 0~VREF.

[0033] The accuracy of the drive voltage is closely related to the accuracy of the output power, and the 16-bit resolution and ±4LSB accuracy of the DAC8554 chip play a key role. In order to ensure the accuracy of the output drive voltage, the reference voltage of the DAC8554 chip is crucial. The REF02CSZ-REEL7 chip is a precision voltage reference chip that can be used in precision data systems and high-resolution converter applications. It can provide a stable 5V output and has minimal response to changes in power supply voltage, ambient temperature or load conditions. Therefore, the REF02CSZ-REEL7 chip can provide a stable reference voltage for the DAC8554 chip. The REF02CSZ-REEL7 chip also provides a TRIM terminal for fine-tuning the output voltage.

[0034] In one embodiment, a sampling current detection circuit is also integrated in the microcontroller chip; the current detection circuit includes the sampling current detection circuit in the microcontroller chip; the sampling current detection circuit in the microcontroller chip is connected to the current sampling circuit.

[0035] In this embodiment, a voltage control circuit and a detection circuit for sampling current are integrated in the microcontroller chip. The voltage control circuit is used to perform the function of outputting a voltage control value to the voltage output chip to control the voltage output chip to output a driving voltage corresponding to the voltage control value. The detection circuit is used to perform the detection function of the sampling current of the current sampling circuit. The two perform different functions, but are both integrated in the microcontroller chip. That is, the microcontroller chip simultaneously realizes the two functions of controlling the driving voltage and detecting the current of the sampling current.

[0036] Specifically, the U4A chip also integrates the current detection function. Figure 2 As shown, the PC0 pin, PC1 pin, PC2 pin and PC3 pin corresponding to the MCU detection part are used to access the external sampling current. For example, they are connected to the current sampling circuit. Therefore, the voltage value of the driving voltage can be controlled based on the sampling current.

[0037] In one embodiment, the voltage driving circuit includes a first operational amplifier, the non-inverting input terminal of the first operational amplifier is connected to the output terminal of the driving voltage control circuit, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is also connected to the control terminal of the switch tube. Wherein, the voltage driving circuit also includes a first resistor, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier through the first resistor; and / or, the voltage driving circuit also includes a first capacitor, and the first capacitor is connected in parallel with the first resistor.

[0038] Specifically, Figure 5As shown, the model of the first operational amplifier is HT1561ARTZ. The first resistor is resistor R66, and the first capacitor is capacitor C131. The first operational amplifier adopts negative feedback, and the first capacitor can achieve phase compensation, prevent oscillation, and suppress high-frequency noise. The first resistor is used to suppress the amplification factor of the first operational amplifier, thereby controlling the output of the first operational amplifier. Among them, the DAC_VOTA terminal of the first operational amplifier is connected to Figure 3 The DAC_VOTA terminal of the U41 chip is connected to input the driving voltage. The voltage driving circuit uses the operational amplifier of the HT1561ARTZ chip to enhance the driving ability of the circuit.

[0039] In one embodiment, the pump source driving circuit further includes a second operational amplifier, the in-phase input terminal of the second operational amplifier is connected to the output terminal of the voltage driving circuit, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is also connected to the control terminal of the switch tube. Wherein, the pump source driving circuit further includes a second resistor, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier through the second resistor; and / or, the pump source driving circuit further includes a second capacitor, and the second capacitor is connected in parallel with the second resistor.

[0040] Specifically, the switch tube is a MOS tube. Figure 6 As shown, the MOS tube is a switch tube Q1, and the model of the switch tube Q1 is AUIRFP4568. The model of the second operational amplifier is TLC082A. The second resistor is a resistor R13, and the second capacitor is a capacitor C11. The +ULD terminal is connected to the output terminal of the current of the pump source. The second operational amplifier adopts negative feedback, and the second capacitor can achieve phase compensation, prevent oscillation, and suppress high-frequency noise. The second resistor is used to suppress the amplification factor of the first operational amplifier, thereby controlling the output of the second operational amplifier. Therefore, by adjusting the GS voltage of the switch tube Q1, the DS current of the switch tube Q1, that is, the current of the pump source, is controlled.

[0041] In one embodiment, the current sampling circuit includes a sampling resistor, one end of the sampling resistor is connected to the output end of the switch tube, and the other end of the sampling resistor is grounded. The current sampling circuit also includes a third operational amplifier and a fourth operational amplifier; the non-inverting input end of the third operational amplifier is connected to one end of the sampling resistor, and the inverting input end of the third operational amplifier is connected to the output end of the third operational amplifier; the output end of the third operational amplifier is connected to the non-inverting input end of the fourth operational amplifier; the inverting input end of the fourth operational amplifier is connected to the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is also connected to the current detection circuit.

[0042] Specifically, Figure 7As shown, the sampling resistor is resistor R27, and the model of the third operational amplifier is AD8616. Figure 8 As shown, the model of the fourth operational amplifier is HT1561ARTZ. Figure 7 The ILD1 terminal of the third operational amplifier is connected to Figure 8 The ILD1 terminal of the fourth operational amplifier is connected. Figure 8 The ILD ADC1 terminal of the fourth operational amplifier is connected to Figure 2 Therefore, the current sampling circuit converts the current into voltage through the resistor R27, and transmits the voltage to the operational amplifier circuit of the third operational amplifier and the fourth operational amplifier. Figure 2 The ADC circuit inside the U4A chip shown adjusts the voltage of the pump source driving circuit according to the sampling voltage corresponding to the sampling current, thereby ensuring the stable output power of the pump source.

[0043] Those skilled in the art will understand that the models of the electronic components (e.g., microcontroller chip, voltage output chip, switch tube Q1, first operational amplifier, second operational amplifier, third operational amplifier, fourth operational amplifier) ​​shown in this embodiment are merely exemplary and do not limit the scope of the present invention.

[0044] The driving detection circuit of each of the above embodiments has high circuit stability and accuracy, and can effectively control the stable output power of the pump source.

[0045] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A drive detection circuit, used to connect with a laser, characterized in that: The drive detection circuit comprises: A driving voltage control circuit, used for outputting a driving voltage; A voltage driving circuit, connected to the driving voltage control circuit, and used for performing an operational amplifier on the driving voltage output by the driving voltage control circuit and then outputting the driving voltage; A pump source driving circuit, wherein the pump source driving circuit comprises a switch tube, wherein an input end of the switch tube is connected to a pump source of the laser, a control end of the switch tube is connected to an output end of the voltage driving circuit, and an output end of the switch tube is used for grounding; A current sampling circuit, connected to the output end of the switch tube, for sampling the current of the pump source; A current detection circuit is connected to the current sampling circuit and is used to detect the sampling current output by the current sampling circuit. The current detection circuit is also connected to the drive voltage control circuit and is used to provide the sampling current to the drive voltage control circuit so that the drive voltage control circuit outputs the drive voltage based on the sampling current.

2. The drive detection circuit according to claim 1, characterized in that: The driving voltage control circuit comprises a microcontroller chip and a voltage output chip, wherein the microcontroller chip is integrated with a voltage control circuit, the voltage control circuit is used to output a voltage control value of the driving voltage, and the voltage output chip is used to output the driving voltage; The voltage control circuit in the microcontroller chip is connected to the voltage output chip; The voltage output chip is connected to the voltage driving circuit.

3. The drive detection circuit according to claim 2, characterized in that: The driving voltage control circuit further includes a voltage reference chip, which is connected to the voltage output chip and is used to provide a reference voltage for the voltage output chip.

4. The drive detection circuit according to claim 2, characterized in that: The microcontroller chip is also integrated with the detection circuit of the sampling current; the current detection circuit includes the detection circuit of the sampling current in the microcontroller chip; The sampling current detection circuit in the microcontroller chip is connected to the current sampling circuit.

5. The drive detection circuit according to claim 1, characterized in that: The voltage driving circuit includes a first operational amplifier, the non-inverting input terminal of the first operational amplifier is connected to the output terminal of the driving voltage control circuit, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is also connected to the control terminal of the switching tube.

6. The drive detection circuit according to claim 5, characterized in that: The voltage driving circuit further includes a first resistor, and the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier through the first resistor; and / or, The voltage driving circuit further includes a first capacitor, which is connected in parallel with the first resistor.

7. The drive detection circuit according to claim 1, characterized in that: The pump source driving circuit also includes a second operational amplifier, a non-inverting input terminal of the second operational amplifier is connected to the output terminal of the voltage driving circuit, an inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is also connected to the control terminal of the switching tube.

8. The drive detection circuit according to claim 7, characterized in that: The pump source driving circuit further includes a second resistor, and the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier through the second resistor; and / or, The pump source driving circuit further includes a second capacitor, and the second capacitor is connected in parallel with the second resistor.

9. The drive detection circuit according to claim 1, characterized in that: The current sampling circuit comprises a sampling resistor, one end of the sampling resistor is connected to the output end of the switch tube, and the other end of the sampling resistor is grounded.

10. The drive detection circuit according to claim 9, characterized in that: The current sampling circuit also includes a third operational amplifier and a fourth operational amplifier; The non-inverting input terminal of the third operational amplifier is connected to one end of the sampling resistor, and the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier; The output terminal of the third operational amplifier is connected to the non-inverting input terminal of the fourth operational amplifier; The inverting input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier, and the output terminal of the fourth operational amplifier is also connected to the current detection circuit.

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