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  • Daily Electronics Knowledge Lesson 22-Laser driver

    A laser driver is an electronic device used to control and drive the operation of a laser. It can excite the laser by providing a current or voltage signal, causing it to generate a unique laser beam.


    The working principle of a laser driver is typically based on the operation mechanism of a laser diode (LD) or a solid-state laser. For a laser diode, the laser driver provides a current signal to generate laser emission by exciting the semiconductor material. For a solid-state laser, the laser driver uses a high-voltage pulse driving circuit to excite the laser medium, causing it to generate laser emission.

    Advantages of laser drivers include:


    1. Precise control: Laser drivers can provide precise current or voltage signals, enabling precise control of the laser. They can adjust parameters such as output power, frequency, and wavelength of the laser.


    2. High efficiency: Laser drivers can provide high-efficiency driving signals, converting electrical energy into laser energy, thereby enhancing the efficiency and output capability of the laser.


    3. Reliability: Laser drivers are designed with precision, using high-quality components and stable driving circuits. They have strong anti-interference ability and the ability to work stably for long periods of time.


    Common combinations of laser drivers include laser diodes and solid-state lasers. The laser driver paired with a laser diode is typically a constant current source, which allows for precise control of the laser diode's current. The laser driver paired with a solid-state laser is usually a pulse drive source, which uses high-voltage pulse signals to excite the laser medium and generate pulsed laser output.


    Laser drivers are widely used in many industries, including:


    1. Laser processing: Laser drivers play a crucial role in laser cutting, laser marking, laser welding, and other laser processing applications.


    2. Medical aesthetics: Laser drivers are used in medical aesthetic devices such as laser hair removal, laser freckle removal, laser tattoo removal, etc., providing precise laser outputs for selective destruction of skin lesions.


    3. Communication and fiber optic transmission: Laser drivers are used in optical communication and fiber optic transmission systems to drive optical communication devices such as optical modulators, laser amplifiers, etc., providing stable laser output signals.


    4. Scientific research experiments: Laser drivers are used in scientific research experiments to excite laser light sources and generate lasers of specific wavelengths and powers for various research fields, including physics experiments and biological experiments.


    In summary, a laser driver is an electronic device used to control and drive lasers, by providing current or voltage signals to excite the lasers. It has advantages such as precise control, high efficiency, and reliability. Common combinations include laser diodes and solid-state lasers, which are commonly used in industries such as laser processing, medical aesthetics, communication and fiber optics, and scientific research experiments.

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  • Daily Electronics Knowledge Lesson 20-Half-bridge driver.

    The full-bridge driver is a commonly used circuit for driving motors or other loads. It consists of two complementary parallel transistors, known as the upper bridge arm and the lower bridge arm. When the upper bridge arm is conducting, the load is connected to the positive power supply, and the load current flows through the upper bridge arm and the load itself. When the lower bridge arm is conducting, the load is connected to the negative power supply, and the load current flows through the lower bridge arm and the load itself. Typically, the conduction and non-conduction of the upper and lower bridge arms are controlled by PWM levels.

    The advantages of full-bridge driver include:

    1. All-directional and bidirectional control: The full-bridge driver can control the motor's forward, reverse, and stop motion. It can flexibly control the movement direction of the load.

    2. High voltage efficiency: The full-bridge driver can efficiently drive the load using the input power supply's voltage, reducing energy losses.

    3. Strong controllability: By adjusting the duty cycle of the PWM signal, the size of the load current can be accurately controlled, achieving precise control of the load.


    The disadvantages of a full-bridge driver include:

    1. High complexity: The design and control of a full-bridge driver are relatively complex, requiring proper control of the on and off states of the upper and lower bridge arms.

    2. High cost: Due to the need for two transistors and PWM control circuits, a full-bridge driver has a higher cost.


    Common applications of full-bridge drivers include single-phase DC motors, stepper motors, and DC brushless motors. Full-bridge drivers are widely used in embedded systems for industrial automation, robotic control, electric vehicles, aerospace, and other fields.

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  • Daily Electronics Knowledge Lesson 20-UARTs

    UARTs are the abbreviation for Universal Asynchronous Receiver/Transmitter, which is a communication protocol used for serial communication between computers and external devices.


    The working principle of UART is to communicate through transmitting binary data. It converts the data to be transmitted into serial data, which is then transmitted through a wire, and then restored to parallel data at the receiving end. UART communicates data transmission through two communication lines, TX (transmit) and RX (receive). The transmitting end converts the data into serial data and sends it, while the receiving end converts the received serial data into parallel data.

    The advantages of UART include:

    1. Fast communication speed, reaching several tens of Mbps.

    2. Simple hardware circuit with lower cost.

    3. Supports baud rate adaptation to accommodate different communication speeds.

    4. Simple to use, does not require complex protocols.


    The disadvantages of UART include:

    1. Can only perform point-to-point communication and does not support simultaneous communication with multiple devices.

    2. Short transmission distance, typically not exceeding several tens of meters.

    3. Easily susceptible to interference, sensitive to electromagnetic interference and signal attenuation.



    Common combinations of UART include:

    1. Communication between microcontrollers and sensors or peripherals.

    2. Communication between computers and external devices such as printers or modems.


    UART is widely used in various industries, including:

    1. Electronics manufacturing industry: in areas such as mobile phones, computers, automotive electronics, etc.

    2. Industrial automation: used for communication between control systems, sensors, actuators, and other devices.

    3. Communication field: used for transmitting data, voice, and other information.

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  • Daily Electronics Knowledge Lesson 19-OR controller and ideal diode

    The OR controller is a logic circuit used to perform logical operations on multiple input signals and generate an output signal. Its principle is that when any input signal is 1, the output signal is also 1, and the output signal is only 0 when all input signals are 0.


    1. Simple and clear: The principle of the OR controller is simple, and it only needs to determine whether there is an input signal of 1 to determine the output signal.

    2. Versatile: The OR controller can be applied to various logic circuits and can meet different needs.

    3. Strong scalability: More input signals can be added as needed to make it suitable for more complex logical operations.


    Common scenarios:

    1. Logic gate circuits: OR controllers can be used for the design and implementation of logic gate circuits.

    2. Automatic control systems: OR controllers can be applied to logic judgment and control operations in automatic control systems.

    3. State transition: OR controllers can be used to convert multiple signals of different states into one output signal.


    Industry usage:

    OR controllers are widely used in fields such as electronic circuit design, automatic control systems, and computer science.


    Principle of Ideal Diode:

    The ideal diode is a type of nonlinear electronic component, and its principle is based on the forward conduction and reverse cutoff characteristics of the PN junction. When the forward voltage of the diode is higher than a certain threshold (forward voltage drop), current can flow from the P region to the N region, forming forward conduction; whereas under reverse voltage, when the voltage is lower than the threshold, the diode is in the cutoff state, and current cannot pass through.


    1. Low cost and high reliability: Diodes are very simple electronic components, with relatively low manufacturing costs and high reliability.

    2. Fast switching characteristics: Diodes have fast response times and can be used as fast-switching devices.

    3. Replacement for vacuum tubes: Diodes are substitutes for vacuum tubes, with small size, durability, and low power consumption.


    Common applications:

    1. Rectifiers: Diodes are commonly used in rectifier circuits for electrical energy conversion, converting alternating current to direct current.

    2. Energy conversion: Diodes are used in the field of energy conversion, such as using diodes in solar panels to prevent reverse current.

    3. Software protection: Diodes can be used as devices to protect other electronic components from overvoltage or overcurrent.



    Industry Usage:

    Diodes are widely used in industries such as electronics, communications, and energy. Common applications include power supplies, circuit protection, LED lighting, wireless communications, etc. In electronic devices, diodes are used for signal processing, power management, circuit protection, and more. In communication devices, diodes can be used in circuits such as RF amplifiers, receivers, modems, etc. In the energy industry, diodes play an important role in devices such as solar panels and electric vehicle chargers.


    In certain scenarios, ideal diodes and OR controllers can be combined to achieve specific functions. For example, an OR controller can be used to control the switch of an ideal diode. When at least one input signal of the OR controller is high, the output of the OR controller is high, allowing the ideal diode to be in the conducting state and allowing current to pass. Conversely, if all input signals are low, the output of the OR controller is low, similar to placing the ideal diode in the off state, preventing current flow.


    Therefore, by combining ideal diodes and OR controllers, effective control and management of current can be achieved, meeting the requirements of circuit design.

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  • Daily Electronics Knowledge Lesson 18-parity generator

    The parity generator is a circuit or algorithm used to calculate the number of 1s in the data to be transmitted and add an additional bit (parity bit) to the data based on the result (odd parity or even parity). The main purpose of the parity generator is to detect and correct errors during data transmission.


    The importance of the parity generator lies in providing reliability in data transmission. By adding a parity bit in the data, the sender can detect errors during transmission, and the receiver can use the parity bit to correct the erroneous data.



    1. Easy to implement: Parity check generator can be implemented through simple circuit design or software algorithms.

    2. Error detection: Parity check generator can detect errors during data transmission, improving the reliability of data transmission.



    1. Unable to correct errors: Parity check generator can only detect the presence of errors, but cannot correct erroneous data.

    2. Not suitable for large-scale data transmission: Parity check generator is suitable for small-scale data transmission. For large-scale data transmission, other more complex error-checking methods are more suitable.


    The parity check generator is widely used in industries such as communication, computer networks, and data storage.


    Common applications include:


    1. Communication industry: Before transmitting data, a parity check generator is used to verify the data to be sent, ensuring the accuracy of data transmission.


    2. Computer network industry: In network communication, a parity check generator can be used to detect errors in data transmission and take appropriate corrective measures to ensure reliable data transmission.


    3. Data storage industry: In storage devices such as hard drives and solid-state drives, a parity check generator can be used to detect and correct errors in stored data, improving data reliability and integrity.


    In short, parity check generators play an important role in data communication and storage, helping to detect and correct errors in the data transmission process, and improve the reliability of data transmission. However, for large-scale data transmission and high error correction requirements, other more complex check methods may be needed.

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  • Daily Electronics Knowledge Lesson 17 -LGH cable

    The LGH cable is a cable used for power supply and signal transmission, its full name is Low Smoke Zero Halogen Cable, which means low smoke zero halogen cable.


    The main purpose of the LGH cable is to provide power and signal transmission in environments such as buildings, industries, and ships. It is commonly used in areas such as power supply equipment, power tools, lighting systems, communication equipment, and data transmission systems.

    The importance of the LGH cable lies in its special low smoke zero halogen material, which can reduce the release of toxic gases and smoke during a fire to protect the safety of personnel. At the same time, the LGH cable has excellent wear resistance and tensile strength, and can work continuously and stably in various harsh environments.


    The advantages of LGH cables include:


    1. Low smoke zero halogen materials: LGH cables produce less smoke and harmful gases during a fire, reducing the threat to personnel.

    2. Wear resistance: LGH cables have good wear resistance and can withstand heavy pressure and friction for a long time.

    3. Tensile strength: LGH cables have high tensile strength and can meet the tensile requirements of different occasions.

    4. Reliability: Due to its special materials and structural design, LGH cables have high reliability and can work stably for a long time.


    The disadvantages of LGH cables include:


    1. Higher cost: Compared to traditional cables, LGH cables have more complex materials and manufacturing processes, resulting in higher prices.

    2. High installation requirements: Due to the special materials and structural design of LGH cables, installation requires certain professional knowledge and skills, increasing the difficulty of construction.


    LGH cables are commonly used in industries such as construction, industrial, and maritime, among others. Its low smoke zero halogen characteristics make it particularly suitable for use in places with high personnel density and strict environmental requirements. Common industry applications include:


    1. Construction industry: LGH cables can be used for power supply and lighting systems in buildings, providing safe and reliable electrical equipment.

    2. Industrial industry: LGH cables can be used for power supply and signal transmission in industrial equipment, such as machinery and automation systems.

    3. Maritime industry: The low smoke zero halogen characteristics of LGH cables make them widely used in maritime power and communication systems to ensure safety and reliability on board.

    4. Data centers: Due to the characteristics of low smoke zero halogen materials, LGH cables are also commonly used for power supply and data transmission in data centers to ensure stable operation of equipment.

    5. Medical industry: LGH cables are widely used in medical equipment and places with high health and environmental requirements to ensure safety and hygiene.


    Overall, LGH cables have significant application value in environments that require high safety and stability due to their low smoke zero halogen, wear resistance, and tensile strength characteristics.


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