AC-AC chopping electronic transformer

Abstract

The utility model discloses an AC-AC chopping electronic transformer, which comprises a bus power supply unit, a chopping unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit and a frequency zero crossing point sampling unit, the bus power supply unit is connected with the chopping unit; the chopping unit is connected with the protection output unit; the current sampling unit and the voltage sampling unit are respectively connected with the protection output unit; the current sampling unit and the voltage sampling unit are respectively connected with the control unit; the bus power supply unit is connected with the frequency zero crossing point sampling unit; the frequency zero crossing point sampling unit is connected with the control unit. By means of the transformer, the control precision can be improved, dynamic real-time monitoring is achieved, and the overload protection capacity is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an AC-AC chopper electronic transformer. Background Technology

[0002] Existing AC / AC converters typically rely on pure hardware circuitry or floating drive schemes to achieve voltage regulation and control. These methods primarily use electronic components with fixed parameters to perform voltage conversion, lacking flexibility and precision. Because their control logic is based on preset hardware configurations, it is difficult to adjust the output voltage in real time according to changes in power grid conditions, resulting in difficulties in maintaining output voltage stability under different load conditions. Furthermore, this design typically does not support real-time monitoring of critical parameters such as input voltage and current, making the system unable to respond promptly to abnormal situations, such as overloads or short circuits, thereby increasing the risk of damage to downstream equipment.

[0003] In contrast, the development of modern power electronics technology emphasizes the importance of digital control. However, traditional AC / AC converters have failed to fully utilize this trend and still face problems such as low control accuracy and slow response speed. Especially when operating in high-voltage environments, if overload occurs without effective protection measures, it can easily damage internal components and even cause electrical safety accidents.

[0004] Therefore, it is necessary to design a new transformer to improve control accuracy, achieve dynamic real-time monitoring, and enhance overload protection capabilities. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an AC-AC chopper electronic transformer.

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is achieved through the following technical solution: An AC-AC chopper electronic transformer is provided, comprising: a bus power supply unit, a chopper unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit, and a frequency zero-crossing sampling unit; the bus power supply unit is connected to the chopper unit; the chopper unit is connected to the protection output unit; the current sampling unit and the voltage sampling unit are respectively connected to the protection output unit; the current sampling unit and the voltage sampling unit are respectively connected to the control unit; the bus power supply unit is connected to the frequency zero-crossing sampling unit; and the frequency zero-crossing sampling unit is connected to the control unit.

[0007] The further technical solution is as follows: the bus power supply unit includes inductor L3, inductor L4, current-limiting resistor RS3, electrolytic capacitor EC5, diode D2, diode D8, diode D1, and voltage-stabilizing capacitor C1; wherein, inductor L4 is connected to inductor L3 through current-limiting resistor RS3; electrolytic capacitor EC5 is connected in parallel with inductor L4; diode D2 is connected to current-limiting resistor RS3; diode D8 is connected to inductor L3; diode D1 is connected to inductor L3; one end of voltage-stabilizing capacitor C1 is connected between diode D1 and inductor L3.

[0008] The further technical solution is as follows: the chopper unit includes a thyristor Q1, and the thyristor Q1 is connected to the diode D1.

[0009] The further technical solution is as follows: the protection output unit includes a relay K1, and the relay K1 is connected to the diode D1.

[0010] The further technical solution is as follows: the voltage sampling unit includes a sampling resistor RS2, a sampling resistor R36, and a filter capacitor C13, wherein the sampling resistor RS2 is connected to the thyristor Q1; the sampling resistor R36 is connected to both the thyristor Q1 and the control unit; and the filter capacitor C13 is connected in parallel with the sampling resistor R36.

[0011] The further technical solution is as follows: the current sampling unit includes a voltage divider resistor R4, a diode D3, a voltage divider resistor R12, and a filter capacitor C4; the voltage divider resistor R4 is connected to the diode D1; the voltage divider resistor R4 is connected to the diode D3; the diode D3 is connected to the filter capacitor C4; the diode D3 is connected to the control unit; the voltage divider resistor R12 is connected in parallel with the filter capacitor C4.

[0012] The further technical solution is as follows: the frequency zero-crossing sampling unit includes a voltage divider resistor R3, a voltage divider resistor R5, and a filter capacitor C5; the voltage divider resistor R3 is connected to the diode D1; the voltage divider resistor R5 is connected to the voltage divider resistor R3; the voltage divider resistor R3 is connected to the filter capacitor C5, which is grounded at one end.

[0013] The further technical solution is as follows: the control unit includes a control chip U1.

[0014] A further technical solution includes a temperature feedback unit, which is connected to the control unit.

[0015] The further technical solution is as follows: the temperature feedback unit includes a thermistor PTC1, a resistor R11 and a resistor R10; the resistor R11 is connected to the control unit; the resistor R10 is connected to the resistor R11; one end of the thermistor PTC1 is connected to the control unit; the other end of the thermistor PTC1 is connected between the resistor R10 and the resistor R11.

[0016] The advantages of this invention compared to existing technologies are as follows: By integrating a bus power supply unit, a chopper unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit, and a frequency zero-crossing sampling unit, this invention achieves dynamic real-time monitoring and precise control of the system. The bus power supply unit provides a stable power supply to the system, ensuring the reliability of the working foundation; the chopper unit works in conjunction with the protection output unit, adjusting the output based on real-time data provided by the current and voltage sampling units, ensuring output stability and response speed; the control unit executes complex algorithms to optimize the chopper process based on this data, and further improves control accuracy by utilizing the precise time reference provided by the frequency zero-crossing sampling unit; in addition, when the system detects an overload, the protection output unit quickly reacts and cuts off the circuit, effectively preventing equipment damage, thereby enhancing the overall overload protection capability; this design not only improves control accuracy and dynamic response performance, but also significantly enhances the safety and stability of the system.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic block diagram of an AC-AC chopper electronic transformer provided for an embodiment of this utility model;

[0020] Figure 2 A specific circuit diagram of an AC-AC chopper electronic transformer provided for an embodiment of this utility model;

[0021] Explanation of the markings in the image:

[0022] 10. Busbar power supply unit; 20. Chopper unit; 30. Protection output unit; 40. Current sampling unit; 50. Voltage sampling unit; 60. Control unit; 70. Frequency zero-crossing sampling unit. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] Most existing AC / AC converters rely on pure hardware circuits with fixed parameters or floating drive schemes for voltage regulation. This approach lacks flexibility and precision, struggles to adapt to changes in grid conditions to stabilize the output voltage in real time, and typically does not support real-time monitoring of critical parameters, increasing the risk of damage to downstream equipment under abnormal conditions. In contrast, modern power electronics technology emphasizes digital control, but traditional AC / AC converters have failed to fully utilize this trend, still facing problems such as low control accuracy and slow response speed. Especially when operating in high-voltage environments, they lack effective protection measures, easily leading to component damage or even electrical safety accidents. Therefore, existing designs urgently need improvement to enhance system safety and reliability.

[0028] Therefore, this utility model provides an AC-AC chopper electronic transformer to improve control accuracy, achieve dynamic real-time monitoring, and enhance overload protection capabilities.

[0029] Specifically, this AC-AC chopper electronic transformer integrates multiple sampling units (current, voltage, and frequency zero-crossing point) and a control unit 60 to achieve dynamic real-time monitoring of input and output parameters, thereby significantly improving the system's control accuracy. The bus power supply unit 10 works in conjunction with the chopper unit 20, utilizing components such as thyristors to achieve efficient voltage conversion. The protection output unit 30, combined with relays, provides a fast-response overload protection mechanism, ensuring rapid power cut-off in abnormal situations to prevent damage. Furthermore, the temperature feedback unit further enhances system safety by monitoring internal temperature changes to adjust operating conditions or trigger protection measures, effectively preventing faults caused by overheating. In summary, this design not only improves system stability and reliability but also significantly strengthens overload protection capabilities, making it adaptable to a wider range of power application environments.

[0030] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0031] Please see Figure 1 An AC-AC chopper electronic transformer includes: a bus power supply unit 10, a chopper unit 20, a protection output unit 30, a current sampling unit 40, a voltage sampling unit 50, a control unit 60, and a frequency zero-crossing sampling unit 70; the bus power supply unit 10 is connected to the chopper unit 20; the chopper unit 20 is connected to the protection output unit 30; the current sampling unit 40 and the voltage sampling unit 50 are respectively connected to the protection output unit 30; the current sampling unit 40 and the voltage sampling unit 50 are respectively connected to the control unit 60; the bus power supply unit 10 is connected to the frequency zero-crossing sampling unit 70; and the frequency zero-crossing sampling unit 70 is connected to the control unit 60.

[0032] In this embodiment, the bus power supply unit 10 is the power input terminal of the entire system, responsible for obtaining electrical energy from the external power grid and supplying it to subsequent circuits. It is directly connected to the chopper unit 20, supplying the latter with the required power.

[0033] After receiving electrical energy from the bus power supply unit 10, the chopper unit 20 uses internal components such as a thyristor (e.g., Q1) to perform voltage conversion, that is, to adjust the output voltage by changing the conduction time. The chopper unit 20 is connected to the protection output unit 30 to transmit the processed power to the load.

[0034] The protection output unit 30 includes a relay (such as K1) to quickly disconnect the circuit upon detection of overload or abnormal conditions, thereby preventing damage to other components. Furthermore, the current sampling unit 40 and the voltage sampling unit 50 are also connected to this unit for real-time monitoring of the output status.

[0035] The current sampling unit 40, composed of voltage divider resistors, diodes, and filter capacitors, is used to measure the current level in the system. Its data is fed back not only to the protection output unit 30 but also directly transmitted to the control unit 60, serving as one of the bases for adjusting parameters.

[0036] The voltage sampling unit 50 is similar to the current sampling unit 40, but is specifically designed for monitoring voltage values. It includes a sampling resistor and a filter capacitor, enabling it to accurately reflect changes in system voltage and transmit the information to the control unit 60 for analysis and processing.

[0037] The control unit 60 includes a control chip (such as U1) that receives data from each sampling unit, makes decisions based on a preset algorithm, and sends instructions to each execution component to maintain the normal operation of the system. Simultaneously, the frequency zero-crossing sampling unit 70 also provides signals to the control unit 60 to help determine the optimal switching time.

[0038] The frequency zero-crossing sampling unit 70 is used to capture the frequency changes of the input AC power, especially the position of the zero-crossing point, which is crucial for optimizing switching operations. This unit is directly connected to the bus power supply unit 10 and transmits the collected information to the control unit 60.

[0039] In summary, this AC-AC chopper electronic transformer, by integrating multiple functional modules, achieves precise control of electrical parameters, enhancing the system's reliability and safety. Each unit has a clearly defined function, and they work closely together to form a complete energy conversion and management system.

[0040] In one embodiment, please refer to Figure 2 The aforementioned bus power supply unit 10 includes inductor L3, inductor L4, current-limiting resistor RS3, electrolytic capacitor EC5, diode D2, diode D8, diode D1, and voltage-stabilizing capacitor C1; wherein, inductor L4 is connected to inductor L3 through current-limiting resistor RS3; electrolytic capacitor EC5 is connected in parallel with inductor L4; diode D2 is connected to current-limiting resistor RS3; diode D8 is connected to inductor L3; diode D1 is connected to inductor L3; and one end of voltage-stabilizing capacitor C1 is connected between diode D1 and inductor L3.

[0041] In this embodiment, inductor L4 is connected to inductor L3 via current-limiting resistor RS3 to smooth the input current and limit excessive instantaneous current. Electrolytic capacitor EC5 is connected in parallel with inductor L4 to filter and ensure voltage stability. Diode D2 is connected to current-limiting resistor RS3, possibly to prevent reverse current. Diodes D8 and D1 are both connected to inductor L3, with D1 also connected to one end of Zener capacitor C1, forming part of the rectifier circuit to ensure the unidirectionality and stability of the output voltage. One end of Zener capacitor C1 is connected between diode D1 and inductor L3, and the other end is grounded to further stabilize the voltage.

[0042] In one embodiment, please refer to Figure 2 The chopper unit 20 mentioned above includes a silicon controlled rectifier (SCR) Q1, which is connected to a diode D1.

[0043] Specifically, the thyristor Q1 is directly connected to the diode D1. By controlling the conduction time of Q1, the output voltage can be adjusted to achieve AC-to-AC conversion.

[0044] In one embodiment, please refer to Figure 2 The aforementioned protection output unit 30 includes a relay K1, which is connected to a diode D1.

[0045] In this embodiment, relay K1 is also connected to diode D1. When an abnormal condition (such as overload or short circuit) is detected, the relay disconnects the circuit to protect other components from damage.

[0046] In one embodiment, please refer to Figure 2 The voltage sampling unit 50 mentioned above includes a sampling resistor RS2, a sampling resistor R36, and a filter capacitor C13. The sampling resistor RS2 is connected to the thyristor Q1; the sampling resistor R36 is connected to both the thyristor Q1 and the control unit 60; and the filter capacitor C13 is connected in parallel with the sampling resistor R36.

[0047] In this embodiment, the sampling resistor RS2 is connected to the silicon controlled rectifier Q1 to monitor the voltage level.

[0048] The sampling resistor R36 is connected to the thyristor Q1 and the control unit 60 respectively, and feeds back the voltage signal to the control unit 60 for processing.

[0049] The filter capacitor C13 is connected in parallel with the sampling resistor R36 to reduce noise interference and improve measurement accuracy.

[0050] In one embodiment, please refer to Figure 2The aforementioned current sampling unit 40 includes a voltage divider resistor R4, a diode D3, a voltage divider resistor R12, and a filter capacitor C4; the voltage divider resistor R4 is connected to the diode D1; the voltage divider resistor R4 is connected to the diode D3; the diode D3 is connected to the filter capacitor C4; the diode D3 is connected to the control unit 60; and the voltage divider resistor R12 is connected in parallel with the filter capacitor C4.

[0051] In this embodiment, the voltage divider resistor R4 is connected to diodes D1 and D3 for preliminary current measurement.

[0052] Diode D3 is connected to filter capacitor C4 and also to control unit 60 to provide current data.

[0053] The voltage divider resistor R12 is connected in parallel with the filter capacitor C4 to help eliminate high-frequency components in the signal, making the current reading more accurate.

[0054] In one embodiment, please refer to Figure 2 The aforementioned frequency zero-crossing sampling unit 70 includes voltage divider resistors R3 and R5 and filter capacitor C5; voltage divider resistor R3 is connected to diode D1; voltage divider resistor R5 is connected to voltage divider resistor R3; voltage divider resistor R3 is connected to filter capacitor C5 with one end grounded.

[0055] In this embodiment, the voltage divider resistor R3 is connected to the diode D1 to capture the waveform of the input AC power.

[0056] Voltage divider resistor R5 and voltage divider resistor R3 are connected in series to share the voltage.

[0057] One end of the filter capacitor C5 is connected to the voltage divider resistor R3, and the other end is grounded. This filters out unwanted signal components and extracts information about the zero-crossing frequency.

[0058] In one embodiment, please refer to Figure 2 The aforementioned control unit 60 includes a control chip U1. The control chip U1 is responsible for receiving data from various sensors and executing corresponding algorithms to determine how to adjust the state of the thyristor Q1, thereby maintaining the normal operation of the system.

[0059] In one embodiment, please refer to Figure 2 The aforementioned AC-AC chopper electronic transformer also includes a temperature feedback unit, which is connected to the control unit 60.

[0060] In one embodiment, please refer to Figure 2The temperature feedback unit mentioned above includes a thermistor PTC1, a resistor R11, and a resistor R10; resistor R11 is connected to the control unit 60; resistor R10 is connected to resistor R11; one end of the thermistor PTC1 is connected to the control unit 60; the other end of the thermistor PTC1 is connected between resistor R10 and resistor R11.

[0061] In this embodiment, a temperature feedback unit is used to monitor the operating temperature of the system. Resistor R11 is connected to control unit 60. Resistor R10 is connected to resistor R11, and the two together form a voltage divider network. One end of thermistor PTC1 is connected to control unit 60, and the other end is located between resistors R10 and R11. The resistance value changes according to temperature changes, thereby affecting the signal strength fed back to control unit 60.

[0062] Please see Figure 2 Alternating current enters the circuit through fuse F1 and is current-limited by resistor R1. Rectifier bridge D2 converts the AC to pulsating DC for use by subsequent circuits. Filter capacitor C10 smooths the rectified voltage, reducing ripple and providing a stable DC voltage. Inductors L3 and L4 store energy and smooth current, preventing sudden current surges from impacting the circuit. Diodes D8 and D1 form part of the rectifier circuit, ensuring unidirectional current flow. Electrolytic capacitor EC5 further filters and stabilizes the voltage. The thyristor Q1 (AT25A-600) acts as a switching element, regulating the output voltage by controlling its conduction time. MOSFET M7 assists the thyristor, improving the circuit's response speed and efficiency. Relay K1 quickly disconnects the circuit upon detecting an abnormal condition, protecting other components. Diodes D10 and A7 prevent reverse current, protecting the relay and other components.

[0063] Voltage divider resistors R4 and R12 measure the current level and transmit it to control unit 60 via diode D3 and filter capacitor C4. Diode D3 prevents reverse signal transmission, protecting control unit 60.

[0064] Sampling resistors RS2 and R36 monitor voltage changes and transmit the data to control unit 60 via filter capacitor C13. Filter capacitor C13 reduces noise interference and improves measurement accuracy.

[0065] Voltage divider resistors R3 and R5 capture the zero-crossing information of the input AC frequency. Filter capacitor C5 filters high-frequency components, extracting a pure zero-crossing signal.

[0066] The control chip U1 receives data from various sensors, executes algorithms to adjust the state of the thyristor Q1, and maintains stable system operation.

[0067] The thermistor PTC1 monitors temperature changes to prevent malfunctions caused by overheating.

[0068] The CVT Relay 20V / 200W triggers a protection mechanism to cut off the circuit when the load exceeds 200W. A SCR1 (Silicon Controlled Rectifier) ​​is used to achieve rapid protection action.

[0069] The entire circuit obtains a stable DC power supply through the bus power supply unit 10. The chopper unit 20 uses a thyristor to regulate the output voltage. The protection output unit 30 cuts off the circuit in case of abnormality. The current and voltage sampling unit 50 monitors electrical parameters in real time and feeds them back to the control unit 60. The frequency zero-crossing sampling unit 70 helps determine the optimal switching time. The control unit 60 comprehensively processes various information and dynamically adjusts the system status. The temperature feedback unit monitors the internal temperature to prevent overheating.

[0070] In this embodiment, the control chip U1 is of type APF200-A, but is not limited to APF200-A, and the chip U2 is of type APF200-A, but is not limited to APF200-A.

[0071] This embodiment achieves precise control of electrical parameters by monitoring current, voltage, and frequency in real time through multiple sampling units and combining this with the intelligent algorithm of the control unit 60. Each sampling unit can promptly report the system status, enabling the control unit 60 to react quickly and maintain stable system operation. Multiple protection mechanisms (such as relays, SCRs, and thermistors) can quickly disconnect the circuit under various abnormal conditions, effectively preventing damage. Optimized circuit design and efficient component selection reduce energy loss and improve overall energy efficiency. It is suitable for various power application scenarios and has broad practical value.

[0072] In summary, this AC-AC chopper electronic transformer is not only complex in structure and comprehensive in function, but also performs excellently in terms of control precision, real-time monitoring and protection capabilities, making it a high-performance power conversion device.

[0073] This embodiment focuses on home and travel applications, aiming to provide a solution capable of stable operation in various global power grid environments. It precisely controls the turn-on time of the thyristor through a combination of analog sampling, digital control, and zero-crossing algorithms, thereby achieving precise regulation of the output voltage amplitude. This ensures that even 110V low-voltage products can maintain a consistent maximum output amplitude across global power grids, enhancing the product's versatility and reliability. Furthermore, to further improve system efficiency and safety, this invention innovatively introduces a bus sampling scheme, achieving low-loss and high-dynamic-response real-time sampling technology, significantly improving the effectiveness of the protection mechanism. Simultaneously, relay supplementary protection measures are added, providing an additional safety barrier for the system and greatly enhancing the overall protection characteristics.

[0074] The bus power supply unit 10 provides a stable auxiliary power supply for the entire system. The inductor and smoothing capacitor in the bus power supply unit 10 are used for energy storage and current smoothing, while the diode ensures unidirectional current flow, and the filter capacitor reduces voltage fluctuations, collectively ensuring stable system operation. Secondly, the current sampling unit 40 realizes real-time acquisition and feedback of the bus current, helping to maintain system stability. Resistors perform current voltage division, and capacitors are used for signal filtering, reducing interference. Then, under normal conditions, the output voltage is controlled by adjusting the conduction time of Q1, while in the event of system overload, the K1 relay quickly cuts off the circuit to prevent damage. This design not only compensates for the limitation that Q1 needs to be turned off at a zero-crossing point but also enhances system safety.

[0075] In addition, the voltage detection unit enables real-time monitoring and feedback of the bus voltage, ensuring voltage stability; the frequency zero-crossing sampling unit 70 captures the AC frequency zero-crossing information, providing an accurate time reference for Q1's conduction and improving control precision; the temperature feedback unit monitors the system temperature in real time, ensuring that Q1's operating temperature remains within the optimal range, preventing performance degradation or damage due to excessive temperature. Finally, U1, as the computing center of the entire system, receives data from various sensors, executes complex control algorithms, and adjusts Q1's state to ensure stable and efficient system operation.

[0076] In addition, please see Figure 2 It also includes a 200W protection circuit, which mainly consists of the following parts:

[0077] Power input and rectification section: Q3 (2N9013) acts as a switching transistor, controlling the power supply's on / off state. D9 (4148) and R21 (1K 1%) form a simple rectifier and filter circuit, providing DC voltage for subsequent circuits.

[0078] Chip U2: This is a core control chip that connects to other components through multiple pins to control the entire circuit. VCC is its power supply terminal, and GND is its ground terminal. The AD pin is used for analog signal input, and the IO pin is used for digital signal input and output.

[0079] Current sampling and overload protection: Point CS is the current sampling point, and current is detected through a network composed of resistors R18, R19, R20 and diode D5 (4148). When the current exceeds the set value, SRC1 is triggered, which in turn controls SCR1 (silicon controlled rectifier) ​​to conduct through chip U2, cutting off the load current and providing overload protection.

[0080] Thyristor Driver and Load Output: RS1 (35mΩ), R13 (10kΩ), R14 (100Ω), and Q2 (AT8A-600) constitute the thyristor driver circuit. When U2 detects an overload or other abnormal condition, it controls SCR1 to cut off the load current, protecting the circuit from damage. RL4 (100K / 3W) is the load resistor, and 200W-Lout and Nout are the load output terminals.

[0081] Indicator lights and status display: The green power-on light and the red protection light are connected to the corresponding pins of U2 via R21 (1kΩ) and R15 (1KΩ) respectively, to indicate the circuit's operating status. During normal operation, the green light is on; in case of overload or fault, the red light is on to alert the user.

[0082] In summary, this circuit ensures stable operation with a power consumption not exceeding 200W through precise current sampling, intelligent control, and a fast-response protection mechanism, and promptly disconnects the load in case of abnormalities to protect equipment safety.

[0083] The transformer in this embodiment not only solves the problem of product adaptability in global power grid environments, but also significantly improves the safety and reliability of the system, making it ideal for home and travel devices requiring global compatibility. These improvements enable the product to perform excellently even under different global power grid conditions, meeting diverse user needs.

[0084] The aforementioned AC-AC chopper electronic transformer integrates a bus power supply unit 10, a chopper unit 20, a protection output unit 30, a current sampling unit 40, a voltage sampling unit 50, a control unit 60, and a frequency zero-crossing sampling unit 70, achieving dynamic real-time monitoring and precise control of the system. The bus power supply unit 10 provides a stable power supply to the system, ensuring the reliability of the operating foundation. The chopper unit 20 works in conjunction with the protection output unit 30, adjusting the output based on real-time data provided by the current and voltage sampling units 50, ensuring output stability and response speed. The control unit 60 executes complex algorithms based on this data to optimize the chopping process and further improves control accuracy using the precise time reference provided by the frequency zero-crossing sampling unit 70. Furthermore, when the system detects an overload, the protection output unit 30 quickly reacts and cuts off the circuit, effectively preventing equipment damage and enhancing the overall overload protection capability. This design not only improves control accuracy and dynamic response performance but also significantly enhances the system's safety and stability.

[0085] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An AC-AC chopper electronic transformer, characterized in that, include: The system includes a bus power supply unit, a chopper unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit, and a frequency zero-crossing sampling unit. The bus power supply unit is connected to the chopper unit. The chopper unit is connected to the protection output unit. The current sampling unit and the voltage sampling unit are respectively connected to the protection output unit. The current sampling unit and the voltage sampling unit are respectively connected to the control unit. The bus power supply unit is connected to the frequency zero-crossing sampling unit. The frequency zero-crossing sampling unit is connected to the control unit.

2. The AC-AC chopper electronic transformer according to claim 1, characterized in that, The bus power supply unit includes inductor L3, inductor L4, current-limiting resistor RS3, electrolytic capacitor EC5, diode D2, diode D8, diode D1, and voltage-stabilizing capacitor C1; wherein, inductor L4 is connected to inductor L3 through current-limiting resistor RS3; electrolytic capacitor EC5 is connected in parallel with inductor L4; diode D2 is connected to current-limiting resistor RS3; diode D8 is connected to inductor L3; diode D1 is connected to inductor L3; one end of voltage-stabilizing capacitor C1 is connected between diode D1 and inductor L3.

3. The AC-AC chopper electronic transformer according to claim 2, characterized in that, The chopper unit includes a silicon controlled rectifier (SCR) Q1, which is connected to the diode D1.

4. An AC-AC chopper electronic transformer according to claim 3, characterized in that, The protection output unit includes a relay K1, which is connected to the diode D1.

5. An AC-AC chopper electronic transformer according to claim 4, characterized in that, The voltage sampling unit includes a sampling resistor RS2, a sampling resistor R36, and a filter capacitor C13. The sampling resistor RS2 is connected to the thyristor Q1; the sampling resistor R36 is connected to both the thyristor Q1 and the control unit; and the filter capacitor C13 is connected in parallel with the sampling resistor R36.

6. An AC-AC chopper electronic transformer according to claim 5, characterized in that, The current sampling unit includes a voltage divider resistor R4, a diode D3, a voltage divider resistor R12, and a filter capacitor C4; the voltage divider resistor R4 is connected to the diode D1; the voltage divider resistor R4 is connected to the diode D3; the diode D3 is connected to the filter capacitor C4; the diode D3 is connected to the control unit; and the voltage divider resistor R12 is connected in parallel with the filter capacitor C4.

7. An AC-AC chopper electronic transformer according to claim 6, characterized in that, The frequency zero-crossing sampling unit includes a voltage divider resistor R3, a voltage divider resistor R5, and a filter capacitor C5; the voltage divider resistor R3 is connected to the diode D1; the voltage divider resistor R5 is connected to the voltage divider resistor R3; and the voltage divider resistor R3 is connected to the filter capacitor C5, which is grounded at one end.

8. An AC-AC chopper electronic transformer according to claim 1, characterized in that, The control unit includes a control chip U1.

9. An AC-AC chopper electronic transformer according to claim 1, characterized in that, It also includes a temperature feedback unit, which is connected to the control unit.

10. An AC-AC chopper electronic transformer according to claim 9, characterized in that, The temperature feedback unit includes a thermistor PTC1, a resistor R11, and a resistor R10; the resistor R11 is connected to the control unit; the resistor R10 is connected to the resistor R11; one end of the thermistor PTC1 is connected to the control unit; and the other end of the thermistor PTC1 is connected between the resistor R10 and the resistor R11.

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