Power supply circuit and residual current circuit breaker
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG TENGEN ELECTRIC
- Filing Date
- 2025-07-03
- Publication Date
- 2026-07-21
Smart Images
Figure CN224538059U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of residual current circuit breaker technology, and more particularly to a power supply circuit and a residual current circuit breaker. Background Technology
[0002] Circuit breakers, as an important circuit protection device, are widely used in power systems, industrial automation, building electrical systems, and other fields. With the diversification and complexity of electrical equipment, circuit breakers need to undertake more protection functions, such as short-circuit protection, overload protection, and leakage protection.
[0003] In existing technologies, circuit breaker power supply circuits typically employ simple power supply designs, such as using rectifier circuits or switching power supplies to provide operating voltage to the circuit breaker's control unit and tripping mechanism. While such power supply circuits can meet basic operating requirements under normal load conditions, they may lack sufficient load-carrying capacity when faced with different types of circuit breakers and their diverse operating requirements, failing to provide adequate power support for specific functional modules. This limitation restricts the application range of circuit breakers to some extent and potentially impacts their overall performance. Utility Model Content
[0004] In view of this, the present application provides a power supply circuit and a leakage circuit breaker, which can effectively solve the problem that existing power supply circuits may have insufficient load-carrying capacity and cannot provide sufficient power support for specific functional modules, thereby overcoming this limitation to a certain extent the limitation of the application scope of the circuit breaker and the potential impact on its overall performance.
[0005] In a first aspect, embodiments of this application provide a power supply circuit, including: a pre-stage conversion step-down module and a post-stage voltage regulation output module connected in series, wherein the input terminal of the pre-stage conversion step-down module is used to connect to an AC power supply;
[0006] The subsequent voltage regulation output module includes a first voltage regulation unit and a second voltage regulation unit connected in parallel; wherein, the first voltage regulation unit includes a multimode primary voltage regulator, and the second voltage regulation unit includes a non-isolated AC-DC converter;
[0007] The first voltage regulator unit processes the output voltage of the pre-conversion buck module to provide a first regulated signal required by the load connected to the power supply circuit, and the second voltage regulator unit processes the output voltage to provide a second regulated signal required by the load.
[0008] In some embodiments, the second voltage regulating unit further includes: a voltage regulator;
[0009] The input terminal of the non-isolated AC / DC converter is electrically connected to the pre-stage conversion buck module, and the output terminal of the non-isolated AC / DC converter is electrically connected to the input terminal of the voltage regulator. The output terminal of the voltage regulator is used to provide the second regulated signal to the load.
[0010] In some embodiments, the non-isolated AC / DC converter includes a wide output range non-isolated AC / DC converter chip.
[0011] In some embodiments, the pre-conversion step-down module includes a rectifier unit and a step-down unit. The input terminal of the rectifier unit is connected to the AC power supply, the output terminal of the rectifier unit is connected to the input terminal of the step-down unit, and the output terminal of the step-down unit is electrically connected to the post-stage voltage regulation output module.
[0012] In some embodiments, the step-down unit includes: a switching subunit, a voltage divider subunit, and a voltage regulator subunit;
[0013] The input terminal of the voltage divider subunit is connected to the output terminal of the rectifier unit. The first and second output terminals of the voltage divider subunit are respectively connected to the first signal terminal and the control terminal of the switch subunit. The control terminal of the switch subunit is electrically connected to the voltage regulator subunit. The second signal terminal of the switch subunit is electrically connected to the subsequent voltage regulator output module.
[0014] In some embodiments, the pre-conversion step-down module further includes: a first surge protection unit and a second surge protection unit, wherein the first surge protection unit is disposed between the AC power supply and the rectifier unit, and the second surge protection unit is disposed at the output terminal of the rectifier unit.
[0015] In some embodiments, the AC power supply is a single-phase AC power supply, and the rectifier unit includes a full-bridge rectifier subunit electrically connected to the single-phase AC power supply.
[0016] The first surge protection unit includes a varistor, the two ends of which are connected in parallel between the single-phase AC power supply.
[0017] In some embodiments, the AC power supply is a three-phase AC power supply, and the rectifier unit includes a three-phase bridge fully controlled rectifier subunit electrically connected to the three-phase AC power supply.
[0018] The first surge protection unit includes at least three varistors, with the two ends of each varistor connected in parallel between the phase conductors of the three-phase AC power supply.
[0019] In some embodiments, the power supply circuit further includes an isolation module, the input of which is connected to the output of the pre-conversion buck module, and the output of which is connected to the input of the post-regulator output module.
[0020] Secondly, embodiments of this application provide a residual current circuit breaker, the residual current circuit breaker comprising at least one power supply circuit as described in the first aspect above.
[0021] The embodiments of this application have the following beneficial effects:
[0022] The power supply circuit of this application includes a pre-stage conversion buck module and a post-stage regulated output module connected in series. The input terminal of the pre-stage conversion buck module is used to connect to an AC power source. The post-stage regulated output module includes a first voltage regulator unit and a second voltage regulator unit connected in parallel. The first voltage regulator unit includes a multi-mode primary regulator, and the second voltage regulator unit includes a non-isolated AC-DC converter. The first voltage regulator unit processes the output voltage of the pre-stage conversion buck module to provide a first regulated voltage signal required by the load connected to the power supply circuit. The second voltage regulator unit processes the output voltage to provide a second regulated voltage signal required by the load. This application utilizes a non-isolated AC-DC converter to improve the load-carrying capacity of the power supply circuit and utilizes a multi-mode primary regulator to improve the execution speed of the residual current circuit breaker's leakage protection, meeting the requirement of five times the maximum breaking time of the residual current in relevant regulations. While meeting the requirements of different circuit breakers, it provides a reliable guarantee for the overall safety of the system. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 A first structural schematic diagram of the power supply circuit according to an embodiment of this application is shown;
[0025] Figure 2 A circuit diagram of the post-stage voltage regulator output module according to an embodiment of this application is shown;
[0026] Figure 3 A second structural schematic diagram of the power supply circuit according to an embodiment of this application is shown;
[0027] Figure 4 A schematic diagram of the pre-conversion buck module circuit of an embodiment of this application is shown.
[0028] Explanation of key component symbols:
[0029] 10: Pre-amplifier step-down module; 11: Rectifier unit; 12: Step-down unit; 13: First surge protection unit; 14: Second surge protection unit; 20: Post-amplifier voltage regulation output module; 21: First voltage regulation unit; 22: Second voltage regulation unit; 30: Isolation module. Detailed Implementation
[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0031] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0032] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.
[0033] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.
[0034] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0035] Considering that existing power supply circuits may have insufficient load-carrying capacity and be unable to provide sufficient power support for specific functional modules, this application provides a power supply circuit and a residual current circuit breaker. This application utilizes a non-isolated AC / DC converter to improve the load-carrying capacity of the power supply circuit and a multi-mode primary voltage regulator to improve the execution speed of the residual current protection of the residual current circuit breaker, meeting the requirement of five times the maximum breaking time of the residual current in relevant regulations. While satisfying the requirements of different circuit breakers, it provides a reliable guarantee for the overall safety of the system.
[0036] The power supply circuit will be described below with reference to some specific embodiments.
[0037] Figure 1 A schematic diagram of a power supply circuit according to an embodiment of this application is shown. Exemplarily, the load connected to the power supply circuit in this embodiment is a residual current circuit breaker (RCCB). The power supply circuit in this embodiment is used to supply power to the RCCB. The RCCB in this embodiment can be any type of circuit breaker; exemplary, the RCCB is a molded case RCCB.
[0038] Exemplarily, the power supply circuit includes a pre-stage conversion step-down module 10 and a post-stage regulated output module 20 connected in series. The input terminal of the pre-stage conversion step-down module 10 is used to connect to an AC power source. Exemplarily, the AC voltage provided by the AC power source is represented by VAC. It is understood that the AC power source can be a single-phase AC power source or a three-phase AC power source, depending on the actual application.
[0039] The post-stage voltage regulation output module 20 includes a first voltage regulation unit 21 and a second voltage regulation unit 22 connected in parallel. The first voltage regulation unit 21 includes a multi-mode primary voltage regulator, and the second voltage regulation unit 22 includes a non-isolated AC / DC converter. The first voltage regulation unit 21 regulates the output voltage of the pre-stage conversion buck module 10 to provide the required first regulated voltage signal for the residual current circuit breaker (RCCB). The second voltage regulation unit 22 regulates the output voltage of the pre-stage conversion buck module 10 to provide the required second regulated voltage signal for the RCCB. Exemplarily, the first regulated voltage signal is represented by VDD1, and the second regulated voltage signal is represented by VDD2.
[0040] like Figure 2 As shown, the first voltage regulator unit 21 includes a multi-mode primary voltage regulator U5 and a capacitor C29 that are electrically connected. The multi-mode primary voltage regulator U5 has the characteristics of low power consumption and high efficiency, and can quickly establish power supply when the system is powered on or when the power supply is restored, so as to supply power to the leakage circuit breaker.
[0041] Furthermore, the circuit breaker's leakage current protection function relies on the internal detection circuit's rapid response to residual current. Because the multi-mode primary voltage regulator U5 can quickly establish and stabilize the output voltage, it avoids the impact of power supply fluctuations on the detection, improving the circuit breaker's leakage current protection execution time and enabling the circuit breaker's detection circuit to trigger the protection action in a timely manner. This meets the requirement of five times the maximum breaking time of the residual current in relevant regulations.
[0042] Furthermore, such as Figure 2 As shown, exemplarily, the non-isolated AC / DC converter is a wide-output-range non-isolated AC / DC converter chip U2. The second voltage regulator unit 22 also includes a voltage regulator U1. The input terminal of the wide-output-range non-isolated AC / DC converter chip U2 is electrically connected to the front-stage conversion buck module 10, and the output terminal of the wide-output-range non-isolated AC / DC converter chip U2 is electrically connected to the input terminal of the voltage regulator U1. The output terminal of the voltage regulator U1 is used to provide a second voltage regulation signal for the residual current circuit breaker.
[0043] Specifically, such as Figure 2 As shown, resistors, capacitors, and other components can be connected to the wide-output-range non-isolated AC / DC converter chip U2 or the voltage regulator U1 according to the actual application to improve system stability. For example, capacitor C23 can smooth voltage fluctuations, improving circuit reliability and anti-interference capability. The wide output range of the wide-output-range non-isolated AC / DC converter chip U2 makes it compatible with various input voltage scenarios, improving the load-carrying capacity of the power supply circuit and meeting different load requirements. Furthermore, by placing the voltage regulator U1 at the output terminal of the wide-output-range non-isolated AC / DC converter chip U2, the output voltage of the chip can be stabilized, ensuring that the circuit breaker receives a constant and compliant operating voltage. This prevents circuit breaker performance instability or failure due to voltage fluctuations, thus improving the reliability of the circuit breaker power supply.
[0044] The pre-conversion step-down module 10 can be equipped with a rectifier unit and a step-down unit to process the power signal, as an optional solution. Figure 3 The diagram shown is a schematic of another power supply circuit structure.
[0045] In one embodiment, such as Figure 3 As shown, the pre-conversion step-down module 10 includes a rectifier unit 11 and a step-down unit 12. The input terminal of the rectifier unit 11 is used to connect to an AC power supply, the output terminal of the rectifier unit 11 is connected to the input terminal of the step-down unit 12, and the output terminal of the step-down unit 12 is electrically connected to the subsequent voltage regulation output module 20.
[0046] Understandably, the rectifier unit 11 can be any type of rectifier circuit. When the AC power supply is a single-phase AC power supply, the rectifier unit 11 is a full-bridge rectifier sub-unit. By rectifying the single-phase AC power supply through the full-bridge rectifier sub-unit, the single-phase AC power supply can be converted into DC power, making the output waveform more stable and improving the power supply utilization rate.
[0047] When the AC power supply is a three-phase AC power supply, the rectifier unit 11 is a three-phase bridge fully controlled rectifier subunit, as exemplarily, such as Figure 4 As shown, the rectifier unit 11 is a three-phase bridge fully controlled rectifier subunit. The input terminal of the three-phase bridge fully controlled rectifier subunit is used to connect to the AC power supply, and the output terminal of the three-phase bridge fully controlled rectifier subunit is connected to the input terminal of the step-down unit 12.
[0048] Specifically, such as Figure 4 As shown, the three-phase bridge fully controlled rectifier subunit includes diodes D3, D4, D5, D6, D7, and D8. Each diode is connected in series in pairs and then in parallel to form the three-phase bridge fully controlled rectifier subunit. Using the three-phase bridge fully controlled rectifier subunit for rectification can significantly improve the power factor of the system and reduce reactive power loss. Furthermore, the three-phase bridge fully controlled rectifier subunit can operate normally within a wide input voltage range, improving the applicability and reliability of the system and making it suitable for various voltage environments.
[0049] It is understood that the step-down unit 12 can be a resistor-capacitor step-down unit, or a resistor step-down unit, etc. Exemplarily, the step-down unit 12 includes: a switching subunit, a voltage divider subunit, and a voltage regulator subunit; the input terminal of the voltage divider subunit is connected to the output terminal of the rectifier unit 11, the first and second output terminals of the voltage divider subunit are respectively connected to the first signal terminal and the control terminal of the switching subunit, the control terminal of the switching subunit is electrically connected to the voltage regulator subunit, and the second signal terminal of the switching subunit is electrically connected to the subsequent voltage regulator output module 20.
[0050] Specifically, such as Figure 4 As shown, the switching subunit is the switching transistor Q2, the voltage divider subunit includes resistors R1 and R2, and the voltage regulator subunit includes the Zener diode D81. When the signal from the three-phase bridge fully controlled rectifier subunit flows to the step-down unit 12, the switching transistor Q2 can disperse the current, preventing damage to the components in the voltage divider subunit, improving the operating voltage range, and protecting the components of the voltage divider subunit.
[0051] Furthermore, the power supply circuit also includes a first surge protection unit 13 and a second surge protection unit 14, wherein the first surge protection unit 13 is disposed between the AC power supply and the rectifier unit 11, and the second surge protection unit 14 is disposed at the output end of the rectifier unit 11.
[0052] Understandably, the first surge protection unit 13 can be configured according to the actual application. When the AC power supply is single-phase, the first surge protection unit 13 includes one varistor, with its two ends connected in parallel between the single-phase AC power supply components for surge protection. When the AC power supply is three-phase, the first surge protection unit 13 includes at least three varistors, with the two ends of each varistor connected in parallel between the phase conductors of the three-phase AC power supply for surge protection. Understandably, if the three-phase AC power supply is a three-phase three-wire system, the first surge protection unit 13 can be equipped with three varistors, with the two ends of each varistor connected in parallel between the phase conductors of the three-phase AC power supply for surge protection. If the three-phase AC power supply is a three-phase four-wire system, the first surge protection unit 13 can be equipped with six varistors, with the two ends of each varistor connected in parallel between the phase conductors of the three-phase AC power supply for surge protection.
[0053] Exemplary, such as Figure 4 As shown, the AC power supply in this embodiment is a three-phase three-wire AC power supply. Surge protection is achieved using varistors MYR1, MYR2, and MYR3, which are disposed between the phase conductors of the first surge protection unit 13. This effectively absorbs overvoltages caused by lightning strikes, power grid fluctuations, or other transient interferences. This prevents overvoltages from damaging downstream circuits and improves system reliability. It also improves the system's electromagnetic compatibility and reduces interference to downstream circuits. Furthermore, placing each varistor between the phase conductors allows for adaptation to different power supplies, improving the circuit's versatility.
[0054] Exemplary, such as Figure 4 As shown, the second surge protection unit 14 includes a varistor MYR4, which is connected in parallel between the output terminals of the rectifier unit 11. The varistor MYR4 at the output terminal of the rectifier circuit can further suppress overvoltage, forming a dual protection mechanism and further improving the safety and stability of the system.
[0055] Furthermore, the power supply circuit also includes an isolation module 30. The input terminal of the isolation module 30 is connected to the output terminal of the pre-stage conversion buck module 10, and the output terminal of the isolation module 30 is connected to the input terminal of the post-stage voltage regulator output module 20. Exemplarily, the isolation module 30 is a diode, which can protect the buck unit 12 and improve system stability.
[0056] This application also provides a residual current circuit breaker, which, by way of example, includes the power supply circuit described above.
[0057] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.
[0058] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.
[0059] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.
[0060] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.
Claims
1. A power supply circuit, characterized in that, include: A pre-stage conversion step-down module and a post-stage voltage regulator output module are connected in series. The input terminal of the pre-stage conversion step-down module is used to connect to an AC power supply. The subsequent voltage regulation output module includes a first voltage regulation unit and a second voltage regulation unit connected in parallel; wherein, the first voltage regulation unit includes a multimode primary voltage regulator, and the second voltage regulation unit includes a non-isolated AC-DC converter; The first voltage regulator unit processes the output voltage of the pre-conversion buck module to provide a first regulated signal required by the load connected to the power supply circuit, and the second voltage regulator unit processes the output voltage to provide a second regulated signal required by the load.
2. The power supply circuit according to claim 1, characterized in that, The second voltage regulator unit further includes: a voltage regulator; The input terminal of the non-isolated AC / DC converter is electrically connected to the pre-stage conversion buck module, and the output terminal of the non-isolated AC / DC converter is electrically connected to the input terminal of the voltage regulator. The output terminal of the voltage regulator is used to provide the second regulated signal to the load.
3. The power supply circuit according to claim 1, characterized in that, The non-isolated AC / DC converter includes a wide output range non-isolated AC / DC converter chip.
4. The power supply circuit according to claim 1, characterized in that, The pre-stage conversion step-down module includes a rectifier unit and a step-down unit. The input terminal of the rectifier unit is connected to the AC power supply, the output terminal of the rectifier unit is connected to the input terminal of the step-down unit, and the output terminal of the step-down unit is electrically connected to the post-stage voltage regulation output module.
5. The power supply circuit according to claim 4, characterized in that, The step-down unit includes: a switching subunit, a voltage divider subunit, and a voltage regulator subunit; The input terminal of the voltage divider subunit is connected to the output terminal of the rectifier unit. The first and second output terminals of the voltage divider subunit are respectively connected to the first signal terminal and the control terminal of the switch subunit. The control terminal of the switch subunit is electrically connected to the voltage regulator subunit. The second signal terminal of the switch subunit is electrically connected to the subsequent voltage regulator output module.
6. The power supply circuit according to claim 4, characterized in that, The pre-conversion step-down module further includes: a first surge protection unit and a second surge protection unit, wherein the first surge protection unit is disposed between the AC power supply and the rectifier unit, and the second surge protection unit is disposed at the output end of the rectifier unit.
7. The power supply circuit according to claim 6, characterized in that, The AC power supply is a single-phase AC power supply, and the rectifier unit includes a full-bridge rectifier subunit electrically connected to the single-phase AC power supply; The first surge protection unit includes a varistor, the two ends of which are connected in parallel between the single-phase AC power supply.
8. The power supply circuit according to claim 6, characterized in that, The AC power supply is a three-phase AC power supply, and the rectifier unit includes a three-phase bridge fully controlled rectifier subunit electrically connected to the three-phase AC power supply; The first surge protection unit includes at least three varistors, with the two ends of each varistor connected in parallel between the phase conductors of the three-phase AC power supply.
9. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes an isolation module, the input of which is connected to the output of the pre-conversion buck module, and the output of which is connected to the input of the post-regulator output module.
10. A residual current circuit breaker, characterized in that, The residual current circuit breaker includes: a power supply circuit as described in any one of claims 1-9.