A control circuit

Abstract

The application discloses a control circuit, and belongs to the electrical technical field. The control circuit is applied to a primary and secondary fusion circuit breaker. The primary and secondary fusion circuit breaker comprises a circuit breaker and a power distribution terminal. The circuit breaker comprises a operating mechanism, and the operating mechanism comprises a coil. The coil generates a magnetic field according to the working current connected thereto to drive the operating mechanism to act. The power distribution terminal comprises a main control module. The control circuit comprises the main control module and a closing and opening control module. The main control module is used for controlling the on-off of the working current flowing through the coil. The closing and opening control module is connected with the coil and the main control module respectively, and is used for cutting off the working current flowing through the coil when the operating mechanism completes the action. The closing control unit in the closing and opening control module responds to the actual opening action completion state of the operating mechanism, the opening control unit responds to the actual closing action completion state of the operating mechanism, the working current connected to the coil is actively cut off, and the energization duration of the coil is reduced.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and more particularly to a control circuit. Background Technology

[0002] Permanent magnet and magnetically controlled circuit breakers are widely used in power distribution systems for on / off control and fault protection due to their advantages of simple structure, high reliability, and rapid operation. Currently, the opening and closing control of permanent magnet and magnetically controlled circuit breakers in the industry mostly adopts a fixed pulse width output mode, which drives the coil to complete the opening and closing actions based on the control signal with a fixed pulse width.

[0003] Current circuit breaker control systems typically reserve a large pulse width margin to avoid operational failures. However, an excessively large fixed pulse width leads to prolonged coil energization, resulting in excess input energy to the coil. This can cause contact bounce and false closing / opening issues during circuit breaker opening, reducing the stability of the power grid. Furthermore, prolonged coil energization causes significant heat generation, which accelerates coil insulation aging and electrolytic capacitor losses, shortening the lifespan of the devices. Summary of the Invention

[0004] This application provides a control circuit designed to solve the above-mentioned problems.

[0005] In a first aspect, this application provides a control circuit applied to a primary and secondary integrated circuit breaker, the primary and secondary integrated circuit breaker including a circuit breaker and a distribution terminal; the circuit breaker includes an operating mechanism, the operating mechanism including a coil, the coil generating a magnetic field according to the incoming operating current to drive the operating mechanism to operate; the distribution terminal includes a main control module; the control circuit includes: a main control module and a tripping / closing control module; the main control module is used to control the on / off state of the operating current flowing through the coil; the tripping / closing control module is connected to the coil and the main control module respectively, and the tripping / closing control module includes at least one of a closing control unit and a tripping control unit; its In the circuit breaker, the closing control unit includes a first unidirectional conducting device and a first switching device connected in parallel. The conducting direction of the first unidirectional conducting device is opposite to the direction of the operating current when the operating mechanism performs the opening action. The first switching device is disconnected when the operating mechanism completes the opening action to cut off the operating current flowing through the coil. The opening control unit includes a second unidirectional conducting device and a second switching device connected in parallel. The conducting direction of the second unidirectional conducting device is opposite to the direction of the operating current when the operating mechanism performs the closing action. The second switching device is disconnected when the operating mechanism completes the closing action to cut off the operating current flowing through the coil.

[0006] In some possible implementations, the first switching device includes a first moving contact and a first stationary contact, and the second switching device includes a second moving contact and a second stationary contact. The first and second switching devices are mechanically linked to the operating mechanism via a linkage. When the operating mechanism completes the opening action, the linkage drives the first moving contact and the first stationary contact to separate, and drives the second moving contact to engage with the second stationary contact. When the operating mechanism completes the closing action, the linkage drives the first moving contact and the first stationary contact to engage, and drives the second moving contact to separate from the second stationary contact.

[0007] In some possible implementations, the first unidirectional conducting device and the second unidirectional conducting device are diodes.

[0008] In some possible implementations, the main control module includes a first power switch, a second power switch, a third power switch, and a fourth power switch, and the closing / opening control module includes a closing control unit and a opening control unit; wherein, one end of the first power switch is connected to the closing voltage, and the other end is grounded through the second power switch, one end of the fourth power switch is connected to the opening voltage, and the other end is grounded through the third power switch, the first power switch and the second power switch are connected to a first node, the third power switch and the fourth power switch are connected to a second node, and the coil is connected between the first node and the second node; the closing control unit and the opening control unit are respectively connected in series at both ends of the coil.

[0009] In some possible implementations, the main control module includes a first power switch, and the opening and closing control module includes an opening control unit; wherein, one end of the first power switch is connected to the closing voltage, and the other end is connected to a coil, which is grounded; the opening control unit is connected in series with the coil.

[0010] In some possible implementations, the main control module includes a fourth power switch, and the opening and closing control module includes a closing control unit; wherein, one end of the fourth power switch is connected to the opening voltage, and the other end is connected to a coil, which is grounded; the closing control unit is connected in series with the coil.

[0011] In some possible implementations, the control circuit further includes a first grounding resistor and a second grounding resistor, with one end of the coil grounded through the first grounding resistor and the other end of the coil grounded through the second grounding resistor.

[0012] In some possible implementations, the control circuit also includes a test voltage source and a current detection module; the test voltage source, the current detection module, the circuit breaker control module, and the coil constitute a test circuit, the test voltage source is used to provide a test voltage to the test circuit, and the current detection module is used to detect the circuit current value of the test circuit.

[0013] In some possible implementations, the current detection module may employ any one of a Hall sensor, a fluxgate sensor, or a sampling resistor.

[0014] In some possible implementations, the control circuit further includes a tripping and closing interlocking module, which includes a tripping switch unit and a closing switch unit that operate synchronously. The tripping switch unit is connected to the main control module and is used to respond to tripping and closing control signals, using a preset tripping control signal as the control signal, and outputting the control signal to the main control module. The closing switch unit is also connected to the main control module and is used to respond to tripping and closing control signals, using a preset closing control signal as the control signal, and outputting the control signal to the main control module.

[0015] The above solution controls the operating current of the coil by the main control module. The closing control unit and the opening control unit in the opening and closing control module respond to the actual opening action completion status and the actual closing action completion status of the operating mechanism, respectively, and actively cut off the operating current of the coil. As a result, the coil operating current can be cut off immediately after the operating mechanism completes its action, reducing the coil energization time, thereby reducing the heat generation caused by prolonged coil energization and improving the service life of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 The principle of the control circuit provided in the embodiments of this application Figure 1 ; Figure 2 The principle of the control circuit provided in the embodiments of this application Figure 2 ; Figure 3 The circuit of the single-coil bistable control circuit provided in the embodiments of this application Figure 1 ; Figure 4 The circuit of the single-coil bistable control circuit provided in the embodiments of this application Figure 2 ; Figure 5 The circuit of the dual-coil monostable control circuit provided in the embodiments of this application Figure 1 ; Figure 6 The circuit of the dual-coil monostable control circuit provided in the embodiments of this application Figure 2 ; Figure 7 The control circuit for adding a test voltage source and current detection module provided in the embodiments of this application. Figure 1 ; Figure 8 The control circuit for adding a test voltage source and current detection module provided in the embodiments of this application. Figure 2 ; Figure 9 This is a schematic diagram of the control circuit for an electrolytic capacitor provided in an embodiment of this application; Figure 10 A schematic diagram of the control circuit for adding a closing and opening interlocking module provided in an embodiment of this application; Figure 11 This is a schematic diagram of the control circuit for the opening and closing interlocking module provided in an embodiment of this application; Figure 12 A flowchart illustrating the operation of the control circuit provided in the embodiments of this application.

[0018] The realization of the objectives, functional features and advantages of the embodiments of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] In the embodiments of this application, it should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0021] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes that element.

[0022] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0023] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0024] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0025] First, before introducing the control circuit provided in the embodiments of this application, related technologies will be introduced so that those skilled in the art can fully understand the content of the embodiments of this application.

[0026] In related technologies, the opening and closing control of permanent magnet and magnetically controlled circuit breakers generally adopts a fixed pulse width output mode. Based on the control signal with a fixed pulse width, the coil is driven to perform opening and closing actions. At the same time, a simple circuit detection mechanism is provided to monitor the on / off status of the control circuit in real time, thereby ensuring the stability of the circuit breaker's routine opening and closing operations.

[0027] The aforementioned control schemes have several shortcomings and are difficult to adapt to complex operating environments. Firstly, to avoid operational failures, the control signals in related technologies typically have a large pulse width margin. Excessive pulse width margin can lead to excess input energy to the coil, easily causing contact bounce and false closing / opening during tripping, reducing the stability of the power grid. Furthermore, prolonged coil energization during closing causes severe heating, accelerating coil insulation aging and electrolytic capacitor wear, shortening the lifespan of core components. Secondly, the fixed pulse width used in related technologies cannot adapt to changes in equipment parameters. Affected by coil aging, parameter drift, and the decay and characteristic fluctuations of electrolytic capacitors, the fixed pulse width easily deviates from the optimal operating range, resulting in insufficient driving force for tripping and closing, failing to meet the reliable tripping and closing requirements of the circuit breaker. Thirdly, the control circuit disconnection detection logic in related technologies is simplistic, only able to determine the circuit's on / off state, unable to accurately locate the circuit fault type or distinguish abnormal operating conditions, making accurate monitoring of the control circuit difficult, resulting in poor equipment reliability and fault tolerance.

[0028] Based on this, this application provides a control circuit that, by setting a tripping control module to immediately cut off the operating current in the control circuit after the coil operating mechanism has reached its position, shortens the coil energization time and thus avoids problems such as contact bounce and incomplete closing / opening caused by excess power. By setting a current detection module and a test voltage source, data references are provided for adjusting the pulse width modulation coefficient of the control signal, thereby outputting a control signal adapted to the actual condition of the circuit components and meeting the reliable tripping and closing requirements of the circuit breaker. Furthermore, the current detection module monitors the circuit status in real time and judges the health status of the components to ensure stable circuit operation.

[0029] Firstly, embodiments of this application provide a control circuit, such as... Figure 1 As shown. The control circuit is applied to a primary and secondary integrated circuit breaker, which includes a circuit breaker and a distribution terminal, connected by a cable. The circuit breaker includes an operating mechanism, which includes a coil. The coil generates a magnetic field based on the applied operating current to drive the operating mechanism. The distribution terminal includes a main control module.

[0030] The control circuit includes a main control module and a tripping / closing control module. The main control module is connected to the coil via the tripping / closing control module and is used to control the on / off state of the working current flowing through the coil. The tripping / closing control module is connected to both the coil and the main control module, and includes at least one of a closing control unit and a tripping control unit. The closing control unit is used to cut off the working current flowing through the coil when the operating mechanism completes the tripping action. The tripping control unit is used to cut off the working current flowing through the coil when the operating mechanism completes the closing action.

[0031] The aforementioned control circuit controls the operating current of the coil via the main control module, and actively cuts off the operating current of the coil by responding to the actual opening action completion status of the operating mechanism via the closing control unit in the opening and closing control module, and by responding to the actual closing action completion status of the operating mechanism via the opening control unit. This avoids the passive control mode that relies solely on a fixed pulse width control signal. Therefore, the coil operating current can be cut off immediately after the operating mechanism completes its action, solving the problem of prolonged coil energization. On the one hand, this avoids continuous coil heating during the closing process, effectively protecting the coil and the drive electrolytic capacitor, and extending the service life of the components. On the other hand, it eliminates abnormal operating conditions such as opening rebound, false closing, and false opening caused by excessive control signal pulse width redundancy, improving the accuracy and operational stability of the circuit breaker's opening and closing actions.

[0032] The various parts of the control circuit will be described in detail below so that those skilled in the art can fully understand the various parts of the control circuit provided in the embodiments of this application.

[0033] In some possible implementations, such as Figure 2 As shown. The closing control unit includes a first unidirectional conducting device and a first switching device, which are connected in parallel. The conduction direction of the first unidirectional conducting device is opposite to the direction of the operating current when the operating mechanism performs the opening action. The first switching device is disconnected when the operating mechanism completes the opening action. The opening control unit includes a second unidirectional conducting device and a second switching device, which are connected in parallel. The conduction direction of the second unidirectional conducting device is opposite to the direction of the operating current when the operating mechanism performs the closing action. The second switching device is disconnected when the operating mechanism completes the closing action.

[0034] As an example, the first unidirectional conducting device and the second unidirectional conducting device may be diodes, and the first switching device and the second switching device may be mechanically linked switching devices.

[0035] In this embodiment, the electrical connections between the main control module, the closing / opening control module, and the coil form a control loop. The control loop includes a closing control loop and a opening control loop; the control signals include a closing control signal and an opening control signal; and the operating current includes an opening operating current and a closing operating current. The main control module activates the closing control loop in response to the closing control signal, thereby connecting the closing operating current to the coil. The main control module also activates the opening control loop in response to the opening control signal, thereby connecting the closing / opening operating current to the coil.

[0036] When performing the tripping action: The main control module responds to the tripping control signal and activates the tripping control circuit, allowing the tripping operating current to flow through the coil along the circuit. At this time, the direction of the tripping operating current is opposite to the conduction direction of the first unidirectional conducting device, which is then turned off. All the tripping operating current flows through the first switching device, ensuring the complete conduction of the tripping control circuit. The coil responds to the tripping operating current and drives the operating mechanism to perform the tripping action. When the operating mechanism completes the tripping action, the first switching device disconnects, directly cutting off the tripping control circuit. Therefore, even with a large pulse width margin in the tripping control signal, it ensures that the coil quickly stops receiving the tripping operating current after the tripping action is completed.

[0037] When performing the closing action: The main control module responds to the closing control signal and activates the closing control circuit, allowing the closing current to flow through the coil along the closing control circuit. At this time, the direction of the closing current is opposite to the conduction direction of the second unidirectional conducting device, which is turned off. The entire closing current is transmitted through the second switching device, which is in the conducting state, ensuring the complete conduction of the closing control circuit. The coil responds to the closing current and drives the operating mechanism to perform the closing action. When the operating mechanism completes the closing action, the second switching device is turned off, directly cutting off the closing control circuit. Therefore, even if the closing control signal has a large pulse width margin, it can ensure that the coil quickly stops receiving the closing current after the closing action is completed.

[0038] As a further possible implementation, such as Figure 3 As shown. The first switching device includes a first moving contact a and a first stationary contact b, and the second switching device includes a second moving contact c and a second stationary contact d. The transmission contacts of the first and second switching devices are mechanically linked to the operating mechanism via a connecting rod. When the operating mechanism completes the opening action, the connecting rod drives the first moving contact a and the first stationary contact b to separate, and drives the second moving contact c and the second stationary contact d to engage. When the operating mechanism completes the closing action, the connecting rod drives the first moving contact a and the first stationary contact b to engage, and drives the second moving contact c and the second stationary contact d to separate.

[0039] In this embodiment, the first moving contact a and the first stationary contact b constitute the tripping node, and the second moving contact c and the second stationary contact d constitute the closing node. The transmission contacts of the first and second switching devices can be connected to the transmission contacts of the operating mechanism through the same or different links, thereby enabling the first and second switching devices to be mechanically linked with the operating mechanism. The first and second switching devices can synchronously switch on and off states following the physical displacement of the operating mechanism.

[0040] When the operating mechanism is in the closed position, the linkage keeps the first moving contact a and the first stationary contact b in contact, while keeping the second moving contact c and the second stationary contact d separate, thus disconnecting the closing control circuit and preparing for the subsequent opening control circuit. When the operating mechanism is in the open position, the linkage keeps the first moving contact a and the first stationary contact b separate, while keeping the second moving contact c and the second stationary contact d in contact, thus disconnecting the opening control circuit and preparing for the subsequent closing control circuit. Therefore, the first and second switching devices, through a mechanical linkage structure, follow the actual physical position of the operating mechanism to switch on and off, requiring no additional signal sampling and responding rapidly.

[0041] The aforementioned opening and closing control unit, through a unidirectional conducting device and a first and second switching device mechanically linked to the operating mechanism, follows the actual physical position of the operating mechanism and cuts off the operating current of the corresponding control circuit the instant the operating mechanism is in position. This achieves adaptive disconnection of the control circuit, preventing the coil from overheating even with a large pulse width margin in the control signal, while also eliminating excessive contact bounce and incomplete closing defects caused by an excessively large pulse width margin.

[0042] In some possible implementations, the control circuit may employ a single-coil bistable structure. For example... Figure 3 and Figure 4 As shown, the main control module includes a first power switch G1, a second power switch G2, a third power switch G3, and a fourth power switch G4. The closing and tripping control module includes a closing control unit and a tripping control unit. One end of the first power switch G1 is connected to the closing voltage VH_HZ, and the other end is grounded through the second power switch G2. One end of the fourth power switch G4 is connected to the tripping voltage VH_FZ, and the other end is grounded through the third power switch G3. The first power switch G1 and the second power switch G2 are connected to the first node, and the third power switch G3 and the fourth power switch G4 are connected to the second node. The coil Coil is connected between the first node and the second node. The closing control unit and the tripping control unit are connected in series across the two ends of the coil Coil.

[0043] In this embodiment, the first power switch G1, the second power switch G2, the third power switch G3, and the fourth power switch G4 constitute a bistable full-bridge drive circuit for the coil. The closing voltage VH_HZ is connected to the first power switch G1, and the opening voltage VH_FZ is connected to the fourth power switch G4.

[0044] like Figure 3As shown, the closing control unit can be connected in series between the first power switch G1 and the coil. The closing control unit includes a first switching device K1 and a first diode D1 connected in parallel. The anode of the first diode D1 is connected to the side of the first power switch G1, and the cathode is connected to the side of the coil. The opening control unit can be connected in series between the coil and the third power switch G3. The opening control unit includes a second switching device K2 and a second diode D2 connected in parallel. The anode of the second diode D2 is connected to the side of the third power switch G3, and the cathode is connected to the side of the coil.

[0045] like Figure 4 As shown, the closing control unit can be connected in series between the coil (Coil) and the third power switch (G3). Internally, it contains a first switching device K1 and a first diode D1 connected in parallel. The anode of the first diode D1 is connected to the coil side, and the cathode is connected to the third power switch G3 side. The opening control unit can be connected in series between the first power switch G1 and the coil (Coil). Internally, it contains a second switching device K2 and a second diode D2 connected in parallel. The anode of the second diode D2 is connected to the coil side, and the cathode is connected to the first power switch G1 side.

[0046] by Figure 3 Taking the circuit shown as an example, when the operating mechanism is in the opening preparation state, the first switching device K1 is open and the second switching device K2 is on. After the closing control signal YKHZ' is output, the first power switch G1 and the third power switch G3 are simultaneously turned on. The closing voltage VH_HZ passes through the first power switch G1, the first diode D1, the coil Coil, the on-state second switching device K2, and the third power switch G3 in sequence to form a complete closing control circuit. The coil drives the operating mechanism to perform the closing action according to the applied closing working current. When the operating mechanism completes the closing action, it drives the first switching device K1 to close and the second switching device K2 to open, directly cutting off the closing control circuit. Even if the closing control signal YKHZ' continues to be output and the first power switch G1 and the third power switch G3 remain on, the coil will immediately lose the closing working current. After the tripping control signal YKFZ' is output, the second power switch G2 and the fourth power switch G4 are simultaneously turned on. The tripping voltage VH_FZ forms a complete tripping control circuit through the fourth power switch G4, the second diode D2, the coil Coil, the turned-on first switching device K1, and the fourth power switch G4. The coil drives the operating mechanism to perform the tripping action according to the applied tripping working current. When the operating mechanism completes the tripping action, it drives the first switching device K1 to open and the second switching device K2 to close, directly switching the tripping control circuit. Even if the tripping control signal YKFZ' is continuously output and the second power switch G2 and the fourth power switch G4 remain on, the coil will immediately lose the tripping working current.

[0047] In some possible implementations, the control circuit may employ a dual-coil monostable structure. For example... Figure 5 As shown, the main control module includes a first power switch, and the opening and closing control module includes an opening control unit; wherein, one end of the first power switch is connected to the closing voltage, and the other end is connected to a coil, which is grounded; the opening control unit is connected in series with the coil.

[0048] In this embodiment, the first power switch G1 constitutes the monostable drive circuit of the coil. The first power switch G1 and the coil Coil are connected in series to form a closing control circuit, and the opening control unit is connected in series within the closing control circuit. The opening control unit includes a second switching device K2 and a second diode D2 connected in parallel. After the closing control signal YKHZ' is output, the first power switch G1 is turned on, and the closing voltage VH_HZ passes through the first power switch G1, the coil Coil, and the second switching device K2 in sequence to turn on the closing control circuit. The coil drives the operating mechanism to perform the closing action according to the applied closing working current. When the operating mechanism completes the closing action, it drives the second switching device K2 to turn off, directly cutting off the closing control circuit. Even if the closing control signal YKHZ' is continuously output and the first power switch G1 remains on, the coil will immediately lose the closing working current.

[0049] In some possible implementations, the control circuit may employ a dual-coil monostable structure. For example... Figure 6 As shown, the main control module includes a fourth power switch G4, and the opening and closing control module includes a closing control unit; wherein, one end of the fourth power switch G4 is connected to the opening voltage VH_FZ, and the other end is connected to the coil Coil, which is grounded; the closing control unit is connected in series with the coil Coil.

[0050] In this embodiment, the fourth power switch G4 constitutes the monostable drive circuit of the coil. The fourth power switch G4 and the coil Coil are connected in series to form a tripping control circuit, and the closing control unit is connected in series within the tripping control circuit. The closing control unit includes a first switching device K1 and a first diode D1 connected in parallel. After the tripping control signal YKFZ' is output, the fourth power switch G4 is turned on, and the tripping voltage VH_FZ passes through the fourth power switch G4, the first switching device K1, and the coil Coil in sequence to turn on the tripping control circuit. The coil drives the operating mechanism to perform the tripping action according to the applied tripping operating current. When the operating mechanism completes the tripping action, it drives the first switching device K1 to turn off, directly cutting off the tripping control circuit. Even if the tripping control signal YKFZ' is continuously output and the fourth power switch G4 remains on, the coil will immediately lose the tripping operating current.

[0051] In the above embodiments, by connecting a tripping control unit and a closing control unit with switching devices and unidirectional conduction devices in series in the bistable full-bridge drive circuit or monostable drive circuit of the coil, the hardware-level control circuit is cut off when the operating mechanism completes its action through the switching devices that are mechanically linked with the circuit breaker operating mechanism. Therefore, the control circuit is not limited by the reserved pulse width margin of the control signal, and directly cuts off the operating current when the operating mechanism reaches its position, achieving adaptive shutdown of the tripping and closing control signals, and adapting to the coil control of permanent magnet / magnetically controlled operating mechanisms of single-coil bistable and dual-coil monostable circuit breakers.

[0052] In some possible implementations, such as Figures 3-6 As shown. The control circuit also includes a first grounding resistor R2 and a second grounding resistor R3. One end of the coil is grounded through the first grounding resistor R2, and the other end of the coil is grounded through the second grounding resistor R3.

[0053] In this embodiment, the resistance values ​​of the first grounding resistor R2 and the second grounding resistor R3 are both much greater than the resistance value of the coil itself. The coil is an inductive load. When the first switching device K1 and the second switching device K2 are disconnected at the moment the operating mechanism moves to its position, the coil generates a reverse induced voltage. The reverse induced voltage is released to the ground through the first grounding resistor R2 and the second grounding resistor R3, providing a release path for the induced electromotive force of the coil and forming a stable freewheeling circuit.

[0054] In the above embodiments, by connecting a large-value grounding resistor across the coil, the reverse induced voltage is quickly absorbed and eliminated at the moment the control circuit is cut off, thereby achieving overvoltage protection for the components in the control circuit, suppressing the risk of device breakdown and aging caused by impulse voltage, and improving the overall operational reliability of the control circuit.

[0055] In some possible implementations, to monitor abnormal states of the control circuit, such as Figure 7 and Figure 8 As shown. The control circuit also includes a test voltage source and a current detection module; the test voltage source, current detection module, circuit breaker control module, and coil constitute a test circuit. The test voltage source is used to provide the test voltage to the test circuit, and the current detection module is used to detect the circuit current value of the test circuit.

[0056] In this embodiment, the current detection module can employ any one of a Hall sensor, a fluxgate sensor, or a sampling resistor to achieve loop current detection. The test voltage source can provide either an AC test voltage (ACV) or a DC test voltage (DCV). The AC test voltage (ACV) or DC test voltage (DCV) can be provided by a digital-to-analog converter or an inverter circuit; this application does not impose specific limitations.

[0057] like Figure 7As shown, the test voltage source can provide an AC test voltage ACV. The test voltage source can be connected between the first node A and the second node B through a current-limiting resistor R1. When the circuit breaker is in the open and stationary state and the control signal has not yet been output, the first power switch G1, the second power switch G2, the third power switch G3, and the fourth power switch G4 are in the off state. At this time, the test voltage source, the current-limiting resistor R1, the Hall sensor U1, the first diode D1, the coil Coil, and the conducting second switching device K2 are connected to form a test circuit.

[0058] like Figure 8 As shown, the test voltage source can provide a DC test voltage DCV, and the test voltage source can be connected to the circuit where the coil is located through the current-limiting resistor R1. When the circuit breaker is in the open and stationary state and the control signal has not yet been output, the first power switch G1 is in the off state. At this time, the test voltage source, the current-limiting resistor R1, the Hall sensor U1, the coil Coil, and the conducting second switching device K2 are connected to form a test circuit.

[0059] Based on the above test circuit, Hall sensor U1 can acquire the circuit current value ICoil in real time. Combined with the known AC test voltage ACV, the static resistance value of the coil can be approximately calculated. By outputting a sinusoidal test waveform at a specified frequency f through a digital-to-analog converter and acquiring the effective value of the AC current through a Hall sensor, the coil impedance ZL can be calculated, and the coil inductive reactance XL can be derived. From this, the coil inductance can be calculated. The coil's static resistance RCoil, coil impedance ZL, coil reactance XL, and coil inductance LCoil are used as the coil's static electrical parameters.

[0060] The operating status of the control circuit can be determined by the static electrical parameters of the coil obtained from the above test circuit. When the control circuit is in a normal state, the main control module is allowed to connect to the control signal; otherwise, the main control module is prohibited from connecting to the control signal to avoid the circuit breaker performing opening and closing control with a fault.

[0061] Furthermore, the current detection module can dynamically adjust the pulse width modulation coefficient K of the control signal based on the circuit current value and the static electrical parameters of the coil. Therefore, by modulating the control signal using the pulse width adjustment coefficient K, precise control of opening and closing can be achieved, reducing the pulse width margin while weakening the rebound amplitude of the opening contact, thus achieving a zero-bounce contact effect.

[0062] As an example, when driving the operating mechanism, the pulse width modulation coefficient K can be configured in segments to control the output energy in stages: 0-5ms pulse width modulation coefficient K is 0.8-1.0, relying on a high duty cycle to quickly start the mechanism; 5-20ms pulse width modulation coefficient K is 0.4-0.6, driving at a constant speed with a medium duty cycle; 20-40ms pulse width modulation coefficient K is 0.1-0.3, completing soft deceleration through a low duty cycle. The pulse width modulation coefficient K for each of the above segments can be dynamically adjusted by software.

[0063] In some possible implementations, such as Figure 9 As shown. The closing voltage VH_HZ and opening voltage VH_FZ can be provided by electrolytic capacitors. The closing electrolytic capacitor C_HZ can be connected to the opening electrolytic capacitor C_FZ via the third diode D3, allowing the closing electrolytic capacitor C_HZ to provide unidirectional supplementary power to the opening electrolytic capacitor C_FZ. Simultaneously, the current detection module can monitor the capacitance health of the electrolytic capacitors by collecting the loop current values ​​of the opening and closing control circuits, along with the coil static electrical parameters, the capacitance value of the electrolytic capacitors, and the voltage across the electrolytic capacitors. It should be noted that when the current detection module collects the loop current values ​​of the opening and closing control circuits, the analog-to-digital converter controller must stop providing the AC test voltage ACV to avoid affecting the current acquisition.

[0064] In the above embodiments, by integrating a test voltage source and a current detection module into the control circuit, circuit status monitoring can be achieved. Based on the collected test circuit current, closing control circuit current, and opening control circuit current, the control circuit can be monitored for abnormalities and the electrolytic capacitors can be checked for health. On the other hand, the pulse width modulation coefficient of the control signal can be adjusted to achieve graded controllable output of drive energy, thereby reducing the contact rebound amplitude and suppressing the coil energization time.

[0065] In some possible implementations, the control signal can be transmitted to the main control module via the opening and closing interlocking module, such as... Figure 10 As shown. The control circuit also includes a tripping and closing interlocking module, which includes a tripping switch unit and a closing switch unit that operate synchronously. The tripping switch unit is connected to the main control module and is used to respond to tripping and closing control signals, using a preset tripping control signal as the control signal, and outputting the control signal to the main control module. The closing switch unit is also connected to the main control module and is used to respond to tripping and closing control signals, using a preset closing control signal as the control signal, and outputting the control signal to the main control module.

[0066] In this embodiment, as Figure 11As shown. The closing switch unit includes a closing switch device K3, and the opening switch unit includes an opening switch device K4. The closing switch device K3 and the opening switch device K4 can be mechanically linked by a linkage. They respond to the same opening / closing control signal FHZ_control and switch on and off synchronously. Their on / off states are mutually exclusive and cannot be turned on simultaneously. The preset closing control signal YKHZ is placed on one side of the closing switch device K3. When the closing switch device K3 is turned on, the opening / closing interlocking module outputs the closing control signal YKHZ'. The preset opening control signal YKFZ is placed on one side of the opening switch device K4. When the opening switch device K4 is turned on, the opening / closing interlocking module outputs the opening control signal YKFZ'.

[0067] In the above embodiments, the closing and opening control signals are mutually exclusive output through the opening and closing interlocking module, thereby achieving hardware interlocking of the opening and closing signals, preventing the bridge arm from being short-circuited due to the synchronous output of the two control signals, and improving the safety of the control circuit.

[0068] The above provides a detailed introduction to each part of the control circuit. The following section will combine... Figure 12 The working process of the control circuit is explained.

[0069] When the control circuit is working, it can first provide test voltage to the test circuit through the test voltage source, measure the loop current value of the test circuit through the current detection module, and determine the operating state of the coil's operating mechanism based on the loop current value. When the operating mechanism is in the closed state, the output channel of the closing control signal is locked and the output channel of the opening control signal is opened. The opening control signal is preset and the test voltage is stopped, so that the main control module responds to the opening control signal to drive the operating mechanism of the coil to perform the opening action. When the opening action is completed, the working current flowing through the coil is cut off through the closing control unit to complete the opening control. When the operating mechanism is in the open state, the output channel of the open control signal is locked and the output channel of the close control signal is opened. The static electrical parameters of the coil are calculated based on the circuit current value and the pulse width modulation coefficient is determined. The working state of the circuit where the coil is located is judged based on the static electrical parameters of the coil. When the circuit where the coil is located is in a normal state, the close control signal is preset and the test voltage is stopped. The close control signal is modulated based on the pulse width modulation coefficient to obtain a pulse width modulation signal, so that the main control module responds to the pulse width modulation signal to drive the operating mechanism of the coil to perform the close action. When the close action is completed, the working current flowing through the coil is cut off through the open control unit to complete the close control.

[0070] In addition, the peak circuit current when the operating mechanism performs opening and closing actions is collected by the current detection module. Combined with the static electrical parameters of the coil and the circuit resistance impedance value, the capacitance health status of the electrolytic capacitor is determined.

[0071] The control circuit described above firstly cuts off the operating current in the control circuit immediately after the coil operating mechanism reaches its position via the opening and closing control module. This avoids problems such as contact bounce and incomplete opening / closing caused by excess power, ensuring stable grid operation. Simultaneously, it prevents the closing coil from overheating due to prolonged energization, slowing down the aging and wear of the coil insulation and drive electrolytic capacitor, and extending the lifespan of the components. Secondly, the current detection module can collect the loop current value of the test circuit in real time, providing a reference for adjusting the pulse width modulation coefficient. This adapts to parameter changes caused by coil aging and electrolytic capacitor decay, matching the optimal drive energy and ensuring sufficient and reliable opening and closing drive energy for the operating mechanism. Thirdly, the loop current value collected by the current detection module enables real-time monitoring of the circuit status, ensuring stable circuit operation.

[0072] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A control circuit, characterized in that, This is applied to a primary and secondary integrated circuit breaker, which includes a circuit breaker and a distribution terminal; the circuit breaker includes an operating mechanism, which includes a coil, and the coil generates a magnetic field according to the incoming operating current to drive the operating mechanism to operate; the distribution terminal includes a main control module; The control circuit includes: The main control module is used to control the on / off state of the working current flowing through the coil; The circuit breaker control module is connected to the coil and the main control module respectively. The circuit breaker control module includes at least one of a closing control unit and a opening control unit. The closing control unit includes a first unidirectional conducting device and a first switching device arranged in parallel. The conducting direction of the first unidirectional conducting device is opposite to the direction of the working current when the operating mechanism performs the opening action. The first switching device is disconnected when the operating mechanism completes the opening action to cut off the working current flowing through the coil. The tripping control unit includes a second unidirectional conducting device and a second switching device arranged in parallel. The conducting direction of the second unidirectional conducting device is opposite to the direction of the working current when the operating mechanism performs the closing action. The second switching device is disconnected when the operating mechanism completes the closing action to cut off the working current flowing through the coil.

2. The control circuit according to claim 1, characterized in that, The first switching device includes a first moving contact and a first stationary contact, and the second switching device includes a second moving contact and a second stationary contact. The first switching device and the second switching device are mechanically linked to the operating mechanism via a connecting rod. When the operating mechanism completes the opening action, the linkage drives the first moving contact and the first stationary contact to separate, and drives the second moving contact to engage with the second stationary contact; When the operating mechanism completes the closing action, the linkage drives the first moving contact and the first stationary contact to engage, and drives the second moving contact to separate from the second stationary contact.

3. The control circuit according to claim 1, characterized in that, Both the first unidirectional conducting device and the second unidirectional conducting device are diodes.

4. The control circuit according to claim 1, characterized in that, The main control module includes a first power switch, a second power switch, a third power switch, and a fourth power switch; the opening and closing control module includes the closing control unit and the opening control unit. Wherein, one end of the first power switch is connected to the closing voltage, and the other end is grounded through the second power switch; one end of the fourth power switch is connected to the opening voltage, and the other end is grounded through the third power switch; the first power switch and the second power switch are connected to the first node; the third power switch and the fourth power switch are connected to the second node; and the coil is connected between the first node and the second node. The closing control unit and the opening control unit are connected in series at both ends of the coil.

5. The control circuit according to claim 1, characterized in that, The main control module includes a first power switch, and the opening and closing control module includes the opening control unit; Wherein, one end of the first power switch is connected to the closing voltage, and the other end is connected to the coil, and the coil is grounded; The trip control unit is connected in series with the coil.

6. The control circuit according to claim 1, characterized in that, The main control module includes a fourth power switch, and the opening and closing control module includes the closing control unit; Wherein, one end of the fourth power switch is connected to the trip voltage, and the other end is connected to the coil, and the coil is grounded; The closing control unit is connected in series with the coil.

7. The control circuit according to claim 1, characterized in that, The control circuit also includes a first grounding resistor and a second grounding resistor. One end of the coil is grounded through the first grounding resistor, and the other end of the coil is grounded through the second grounding resistor.

8. The control circuit according to claim 1, characterized in that, The control circuit also includes a test voltage source and a current detection module; The test voltage source, the current detection module, the circuit breaker control module, and the coil constitute a test circuit. The test voltage source is used to provide a test voltage for the test circuit, and the current detection module is used to detect the circuit current value of the test circuit.

9. The control circuit according to claim 8, characterized in that, The current detection module uses any one of a Hall sensor, a fluxgate sensor, or a sampling resistor.

10. The control circuit according to claim 1, characterized in that, The control circuit also includes a circuit breaker interlocking module, which includes a circuit breaker opening switch unit and a circuit breaker closing switch unit that operate synchronously. The tripping switch unit is connected to the main control module and is used to respond to the tripping and closing control signals, take the preset tripping control signal as the control signal, and output the control signal to the main control module. The closing switch unit is connected to the main control module and is used to respond to the opening and closing control signals, take the preset closing control signal as the control signal, and output the control signal to the main control module.

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