Isolation electrical device of laser

Abstract

The invention discloses an isolation electrical device of a laser, and belongs to the technical field of lasers, the isolation electrical device comprises a hand tool shell, a sensor, a line isolation plate, a communication line and a host, and the sensor, the line isolation plate and the communication line are all arranged in the hand tool shell; an analog signal isolation module and an isolation power supply are arranged on the line isolation board, the sensor is electrically connected with the input end of the signal amplification unit through a communication line, and the output end of the signal amplification unit is electrically connected with the first end of the input side of the linear analog photoelectric coupler through the PNP triode. The second end of the input side of the linear analog photoelectric coupler is electrically connected with the isolation power supply, and the first end of the first output side of the linear analog photoelectric coupler is electrically connected with the analog signal input end of the MCU arranged on the host through an operational amplifier by adopting a communication line. The isolation electrical device of the laser solves the problem that when a host of an existing laser generates high voltage abnormally, the high voltage is transmitted to a sensor through a communication line, and the sensor is burnt out.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and in particular to an isolation electrical device for lasers. Background Technology

[0002] A semiconductor laser is a miniature laser that uses semiconductor materials as its working medium and generates coherent laser light using the principle of stimulated emission. It achieves population inversion through electrical injection, and then amplifies the light using a micrometer-scale resonant cavity before emitting it. It has penetrated into almost all fields that require light, such as communications, industry, medicine, and consumer electronics.

[0003] Currently, semiconductor lasers have sensors mounted on their lenses. The sensor's signal output needs to be connected via a communication line to a host computer located outside the laser. The host computer then controls the corresponding laser unit via a bus. However, if the host computer generates abnormal high voltage, it may transmit this voltage through the communication line to the sensor, potentially burning it out. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides an isolation electrical device for a laser to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an isolation electrical device for a laser, comprising a handpiece housing, a sensor, a circuit isolation board, a communication line and a host, wherein the sensor, the circuit isolation board and the communication line are all disposed inside the handpiece housing; The circuit isolation board is equipped with an analog signal isolation module and an isolation power supply. The circuit corresponding to the analog signal isolation module includes a signal amplification unit, a PNP transistor Q1, a linear analog optocoupler, and an operational amplifier U3B. The signal output terminal NTC_IN of the sensor is electrically connected to the input terminal of the signal amplification unit through a communication line. The output terminal of the signal amplification unit is electrically connected to the base of the PNP transistor Q1. The collector of the PNP transistor Q1 is grounded. The emitter of the PNP transistor Q1 is electrically connected to the first terminal of the input side of the linear analog optocoupler. The second terminal of the input side of the linear analog optocoupler is electrically connected to the 5V interface of the isolation power supply. The first terminal of the first output side of the linear analog optocoupler is electrically connected to the non-inverting input terminal of the operational amplifier U3B and ground, respectively. The second terminal of the first output side of the linear analog optocoupler is electrically connected to the inverting input terminal of the operational amplifier U3B. The output terminal of the operational amplifier U3B is electrically connected to the analog signal input terminal NTC2 of the MCU located on the host computer through a communication line.

[0006] Preferably, the signal amplification unit includes an operational amplifier U2B. The non-inverting input terminal of the operational amplifier U2B is electrically connected to the signal output terminal NTC_IN of the sensor via a communication line. The inverting input terminal of the operational amplifier U2B is electrically connected to the output terminal of the operational amplifier U2B via a resistor R3. The output terminal of the operational amplifier U2B is electrically connected to the base of the PNP transistor Q1.

[0007] Optionally, the signal amplification unit further includes operational amplifier U2A. The inverting input terminal of operational amplifier U2A is electrically connected to the output terminal of operational amplifier U2B and the first terminal of the second output side of the linear analog optocoupler, respectively. The non-inverting input terminal of operational amplifier U2A is electrically connected to ground and the second terminal of the second output side of the linear analog optocoupler, respectively. The output terminal of operational amplifier U2A is electrically connected to the base of the PNP transistor Q1.

[0008] Specifically, the isolated power supply includes a DC-DC power module U7. The positive input terminal +VIN of the DC-DC power module U7 is grounded through a capacitor, and the positive input terminal +VIN of the DC-DC power module U7 is also electrically connected to the external power supply input VCC. The negative input terminal -VIN of the DC-DC power module U7 is grounded. The negative output terminal -VOUT of the DC-DC power module U7 is grounded. The positive output terminal +VOUT of the DC-DC power module U7 is grounded through a capacitor, and the positive output terminal +VOUT of the DC-DC power module U7 is electrically connected as a 5V interface to the second terminal of the input side of the linear analog optocoupler.

[0009] It is worth noting that the isolated power supply also includes a voltage regulator U8. The input terminal VI of the voltage regulator U8 is electrically connected to the positive output terminal +VOUT of the DC-DC power module U7. The ground terminal GND of the voltage regulator U8 is grounded. The output terminal of the voltage regulator U8 is grounded through a capacitor. The input terminal of the voltage regulator U8 is electrically connected to the non-inverting input terminal of the operational amplifier U2B as a 3.3V interface.

[0010] Specifically, the circuit isolation board is also equipped with a digital signal isolation module, which includes a transistor output type optocoupler. The first end of the input side of the transistor output type optocoupler is electrically connected to the 5V interface of the isolation power supply. The second end of the input side of the transistor output type optocoupler is electrically connected to a switch via a communication line. The switch is used to control the working state of the laser bar. The first end of the output side of the transistor output type optocoupler is grounded, and the second end of the output side of the transistor output type optocoupler is electrically connected to the digital signal input terminal of the MCU of the host.

[0011] It is worth noting that the second terminal on the input side of the transistor output optocoupler is grounded through a capacitor.

[0012] Preferably, the second terminal of the input side of the transistor output optocoupler is grounded through a diode, wherein the negative terminal of the diode is electrically connected to the second terminal of the input side of the transistor output optocoupler, and the positive terminal of the diode is grounded.

[0013] The beneficial effects of this invention are as follows: In the isolation electrical device of the laser, within the handpiece housing, a circuit isolation board with an analog signal isolation module and an isolation power supply is installed. Since the analog signal output by the sensor is continuously changing, it is easily affected by noise and interference. By using a linear analog optocoupler, the circuit on the output side of the linear analog optocoupler is isolated from the circuit on the input side. The output side circuit of the linear analog optocoupler is electrically connected to the host, and the input side circuit is electrically connected to the sensor. During the transmission of analog electrical signals from the sensor to the host, the isolation mechanism of the linear analog optocoupler isolates the analog signal from other circuit parts, avoiding mutual interference between the analog signal and other line signals. If the host abnormally generates high voltage, it can prevent the high-voltage signal from being transmitted to the sensor through the communication line, thereby ensuring the safety of the sensor. Attached Figure Description

[0014] Figure 1 This is a circuit diagram of an analog signal isolation module in one embodiment of the present invention; Figure 2 This is a circuit diagram of an isolated power supply in one embodiment of the present invention; Figure 3 This is a circuit diagram of a digital signal isolation module in one embodiment of the present invention; Figure 4 This is a circuit diagram of the wiring terminals of the MCU in one embodiment of the present invention; Figure 5 This is a schematic diagram of the laser structure in one embodiment of the present invention; In the diagram: 1. Sensor; 2. Handpiece housing; 3. Circuit isolation board; 4. Communication cable. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0016] like Figure 1-5As shown, an isolation electrical device for a laser includes a handpiece housing 2, a sensor 1, a circuit isolation board 3, a communication line 4, and a host, wherein the sensor 1, the circuit isolation board 3, and the communication line 4 are all disposed inside the handpiece housing 2; The circuit isolation board 3 is equipped with an analog signal isolation module and an isolation power supply. The circuit corresponding to the analog signal isolation module includes a signal amplification unit, a PNP transistor Q1, a linear analog optocoupler, and an operational amplifier U3B. The signal output terminal NTC_IN of the sensor 1 is electrically connected to the input terminal of the signal amplification unit via a communication line 4. The output terminal of the signal amplification unit is electrically connected to the base of the PNP transistor Q1. The collector of the PNP transistor Q1 is grounded. The emitter of the PNP transistor Q1 is electrically connected to the first terminal of the input side of the linear analog optocoupler (i.e., port 1 of the output side U1A of the linear analog optocoupler in the circuit diagram). The second terminal of the input side of the electro-coupler (i.e., port 2 of the output side U1A of the linear analog optocoupler in the circuit diagram) is electrically connected to the 5V interface of the isolation power supply. The first terminal of the first output side of the linear analog optocoupler (i.e., port 5 of the output side U1C of the linear analog optocoupler in the circuit diagram) is connected to the non-inverting input terminal of the operational amplifier U3B and ground, respectively. The second terminal of the first output side of the linear analog optocoupler (i.e., port 6 of the output side U1C of the linear analog optocoupler in the circuit diagram) is electrically connected to the inverting input terminal of the operational amplifier U3B. The output terminal of the operational amplifier U3B is electrically connected to the analog signal input terminal NTC2 of the MCU located on the host through the communication line 4.

[0017] In the isolation electrical device of the laser, within the handpiece housing 2, a line isolation board 3 with an analog signal isolation module and an isolation power supply is installed. Since the analog signal output by sensor 1 is continuously changing, it is easily affected by noise and interference. A linear analog optocoupler is used to isolate the circuit on the output side of the linear analog optocoupler from the circuit on the input side. The output side circuit of the linear analog optocoupler is electrically connected to the host, and the input side circuit is electrically connected to sensor 1. During the transmission of the analog electrical signal from sensor 1 to the host, the isolation mechanism of the linear analog optocoupler isolates the analog signal from other circuit parts, avoiding mutual interference between the analog signal and other line signals. If the host abnormally generates high voltage, it can prevent the high-voltage signal from being transmitted to sensor 1 through communication line 4, thereby ensuring the safety of sensor 1. In this embodiment, sensor 1 is a temperature sensor.

[0018] Preferably, the signal amplification unit includes an operational amplifier U2B. The non-inverting input terminal of the operational amplifier U2B is electrically connected to the signal output terminal NTC_IN of the sensor 1 via communication line 4. The inverting input terminal of the operational amplifier U2B is electrically connected to the output terminal of the operational amplifier U2B via resistor R3. The output terminal of the operational amplifier U2B is electrically connected to the base of the PNP transistor Q1.

[0019] The operational amplifier U2B in the signal amplification unit amplifies, buffers, and conditions the analog signal. During operation, the analog signal first passes through the operational amplifier U2B in the signal amplification unit, where it amplifies and processes the signal to meet the input requirements of subsequent circuits.

[0020] Optionally, the signal amplification unit further includes operational amplifier U2A. The inverting input terminal of operational amplifier U2A is electrically connected to the output terminal of operational amplifier U2B and the first terminal of the second output side of the linear analog optocoupler (i.e., port 3 of the output side U1B of the linear analog optocoupler in the circuit diagram). The non-inverting input terminal of operational amplifier U2A is electrically connected to ground and the second terminal of the second output side of the linear analog optocoupler (i.e., port 2 of the output side U1B of the linear analog optocoupler in the circuit diagram). The output terminal of operational amplifier U2A is electrically connected to the base of the PNP transistor Q1.

[0021] Specifically, the isolated power supply includes a DC-DC power module U7. The positive input terminal +VIN of the DC-DC power module U7 is grounded through a capacitor, and the positive input terminal +VIN of the DC-DC power module U7 is also electrically connected to the external power supply input VCC. The negative input terminal -VIN of the DC-DC power module U7 is grounded. The negative output terminal -VOUT of the DC-DC power module U7 is grounded. The positive output terminal +VOUT of the DC-DC power module U7 is grounded through a capacitor, and the positive output terminal +VOUT of the DC-DC power module U7 is electrically connected as a 5V interface to the second terminal of the input side of the linear analog optocoupler.

[0022] The DC-DC power module U7 provides an independent power supply for the isolated circuit section, further ensuring the stability and reliability of digital signal transmission. The model number of the DC-DC power module U7 is B0505S. In this embodiment, the positive output terminal +VOUT of the DC-DC power module U7 is grounded through a capacitor, serving a filtering purpose.

[0023] It is worth noting that the isolated power supply also includes a voltage regulator U8. The input terminal VI of the voltage regulator U8 is electrically connected to the positive output terminal +VOUT of the DC-DC power module U7. The ground terminal GND of the voltage regulator U8 is grounded. The output terminal of the voltage regulator U8 is grounded through a capacitor. The input terminal of the voltage regulator U8 is electrically connected to the non-inverting input terminal of the operational amplifier U2B as a 3.3V interface.

[0024] The voltage regulator U8 maintains a stable output voltage at 3.3V when the input voltage fluctuates or the load changes through a dynamic adjustment mechanism, thereby protecting the electronic equipment and ensuring its normal operation.

[0025] It is worth noting that the circuit isolation board 3 is also equipped with a digital signal isolation module. This module includes transistor output optocouplers (i.e., optocouplers U4, U5, and U6 in the circuit diagram). The first input end of the transistor output optocoupler (i.e., port 1 of optocouplers U4, U5, and U6 in the circuit diagram) is electrically connected to the 5V interface of the isolation power supply. The second input end of the transistor output optocoupler (i.e., port 2 of optocouplers U4, U5, and U6 in the circuit diagram) is electrically connected to a switch via communication line 4. The switch is used to control the operating state of the laser bars. Each bar corresponds to a transistor output optocoupler; for example, bar a corresponds to optocoupler U4, bar b corresponds to optocoupler U5, and bar c corresponds to optocoupler U6. Figure 3 In the circuit diagram, for panel J1, port 5 is electrically connected to the switch corresponding to bar a, port 4 is electrically connected to the switch corresponding to bar b, and port 3 is electrically connected to the switch corresponding to bar c. This allows the switch's opening and closing status to be determined by acquiring the corresponding switch levels of the control bars through different optocouplers. For example, a high level indicates the switch is closed, and a low level indicates the switch is open. In this embodiment, the bar is a semiconductor laser chip. The first end of the output side of the transistor output optocoupler (i.e., port 3 in optocouplers U4, U5, and U6 in the circuit diagram) is grounded, and the second end of the output side of the transistor output optocoupler (i.e., port 4 in optocouplers U4, U5, and U6 in the circuit diagram) is electrically connected to the digital signal input terminal of the host's MCU (i.e., ports IN1, IN2, and IN3 of the MCU in the circuit diagram).

[0026] In digital signal processing, transistor output optocouplers can transmit signals using light as a medium, completely isolating the circuits on the input and output sides electrically and avoiding electrical interference during digital signal transmission. Preferably, the second terminal on the input side of the transistor output optocoupler is grounded via a capacitor. This achieves the purpose of filtering.

[0027] Specifically, the second terminal of the input side of the transistor output optocoupler is grounded through a diode, wherein the negative terminal of the diode is electrically connected to the second terminal of the input side of the transistor output optocoupler, and the positive terminal of the diode is grounded. This configuration protects the second terminal of the input side of the transistor output optocoupler and prevents it from being directly grounded.

[0028] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. An isolation electrical device for a laser, characterized in that: It includes a handpiece housing, a sensor, a circuit isolation board, a communication line, and a main unit, wherein the sensor, the circuit isolation board, and the communication line are all housed inside the handpiece housing; The circuit isolation board is equipped with an analog signal isolation module and an isolation power supply. The circuit corresponding to the analog signal isolation module includes a signal amplification unit, a PNP transistor Q1, a linear analog optocoupler, and an operational amplifier U3B. The signal output terminal NTC_IN of the sensor is electrically connected to the input terminal of the signal amplification unit through a communication line. The output terminal of the signal amplification unit is electrically connected to the base of the PNP transistor Q1. The collector of the PNP transistor Q1 is grounded. The emitter of the PNP transistor Q1 is electrically connected to the first terminal of the input side of the linear analog optocoupler. The second terminal of the input side of the linear analog optocoupler is electrically connected to the 5V interface of the isolation power supply. The first terminal of the first output side of the linear analog optocoupler is electrically connected to the non-inverting input terminal of the operational amplifier U3B and ground, respectively. The second terminal of the first output side of the linear analog optocoupler is electrically connected to the inverting input terminal of the operational amplifier U3B. The output terminal of the operational amplifier U3B is electrically connected to the analog signal input terminal NTC2 of the MCU located on the host computer through a communication line.

2. The isolation electrical device for a laser according to claim 1, characterized in that: The signal amplification unit includes an operational amplifier U2B. The non-inverting input terminal of the operational amplifier U2B is electrically connected to the signal output terminal NTC_IN of the sensor via a communication line. The inverting input terminal of the operational amplifier U2B is electrically connected to the output terminal of the operational amplifier U2B via a resistor R3. The output terminal of the operational amplifier U2B is electrically connected to the base of the PNP transistor Q1.

3. The isolation electrical device for a laser according to claim 2, characterized in that: The signal amplification unit further includes operational amplifier U2A. The inverting input terminal of operational amplifier U2A is electrically connected to the output terminal of operational amplifier U2B and the first terminal of the second output side of the linear analog optocoupler, respectively. The non-inverting input terminal of operational amplifier U2A is electrically connected to ground and the second terminal of the second output side of the linear analog optocoupler, respectively. The output terminal of operational amplifier U2A is electrically connected to the base of the PNP transistor Q1.

4. The isolation electrical device for a laser according to claim 2, characterized in that: The isolated power supply includes a DC-DC power module U7. The positive input terminal +VIN of the DC-DC power module U7 is grounded through a capacitor. The positive input terminal +VIN of the DC-DC power module U7 is also electrically connected to the external power supply input VCC. The negative input terminal -VIN of the DC-DC power module U7 is grounded. The negative output terminal -VOUT of the DC-DC power module U7 is grounded; the positive output terminal +VOUT of the DC-DC power module U7 is grounded through a capacitor, and the positive output terminal +VOUT of the DC-DC power module U7 is electrically connected to the second terminal of the input side of the linear analog optocoupler as a 5V interface.

5. The isolation electrical device for a laser according to claim 4, characterized in that: The isolated power supply also includes a voltage regulator U8. The input terminal VI of the voltage regulator U8 is electrically connected to the positive output terminal +VOUT of the DC-DC power module U7. The ground terminal GND of the voltage regulator U8 is grounded. The output terminal of the voltage regulator U8 is grounded through a capacitor. The input terminal of the voltage regulator U8 is electrically connected to the non-inverting input terminal of the operational amplifier U2B as a 3.3V interface.

6. The isolation electrical device for a laser according to claim 1, characterized in that: The circuit isolation board is also equipped with a digital signal isolation module, which includes a transistor output type optocoupler. The first end of the input side of the transistor output type optocoupler is electrically connected to the 5V interface of the isolation power supply. The second end of the input side of the transistor output type optocoupler is electrically connected to a switch via a communication line. The switch is used to control the working state of the laser bar. The first end of the output side of the transistor output type optocoupler is grounded, and the second end of the output side of the transistor output type optocoupler is electrically connected to the digital signal input terminal of the MCU of the host.

7. The isolation electrical device for a laser according to claim 6, characterized in that: The second terminal of the input side of the transistor output optocoupler is grounded through a capacitor.

8. The isolation electrical device for a laser according to claim 6, characterized in that: The second terminal of the input side of the transistor output optocoupler is grounded through a diode, wherein the negative terminal of the diode is electrically connected to the second terminal of the input side of the transistor output optocoupler, and the positive terminal of the diode is grounded.

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