Shunt release, power supply and air conditioner

Abstract

The utility model discloses a shunt release, comprising a release mechanism which is movably arranged in the shunt release; the driving coil activates the magnetic field to drive the tripping mechanism to move and break the circuit breaker when being electrified; the auxiliary contact comprises a common contact which is electrically connected with the power supply; one path of the first switching contact is electrically connected with the driving coil, and the other path of the first switching contact is connected with the first detection terminal; the second switching contact is connected with the second detection terminal; when the power supply loop of the driving coil is conducted, the common contact is connected with the first switching contact, so that an opening state detection signal is output through the first detection terminal; and when the power supply loop of the driving coil is not conducted, the common contact is connected with the second switching contact so as to output a closing state detection signal through the second detection terminal. The utility model further discloses a power supply and an air conditioner, clear feedback of opening and closing states can be provided, and the safety and maintainability of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a shunt trip unit, a power supply, and an air conditioner. Background Technology

[0002] A shunt trip unit is a power protection device used for remote control of circuit breakers or other switching equipment in electrical systems. It disconnects the power supply to protect the equipment in the event of overload, short circuit, or other abnormal conditions. From a principle perspective, a shunt trip unit includes a control unit. The control unit receives control signals from a remote control terminal (e.g., a control room or other automation system) and further drives the actuator to convert the electrical signal into mechanical action, causing the circuit breaker contacts to open or close, disconnecting or connecting the power circuit. The actuator can be an electric actuator or a pneumatic actuator.

[0003] However, the feedback mechanism of the shunt trip unit is not perfect, and users may not know the current state of the shunt trip unit.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] To address the issue that the feedback mechanism of the shunt trip unit is imperfect, leaving users unclear about its current state, the first aspect of this application designs and provides a shunt trip unit.

[0006] A shunt trip unit includes: a tripping mechanism movably disposed within the shunt trip unit; a drive coil that, when energized, activates a magnetic field to drive the tripping mechanism to move and disconnect the circuit breaker; and auxiliary contacts including: a common contact electrically connected to a power supply; a first switching contact, one path of which is electrically connected to the drive coil, and the other path connected to a first detection terminal; and a second switching contact connected to a second detection terminal. When the power supply circuit of the drive coil is on, the common contact is connected to the first switching contact to output a tripping status detection signal through the first detection terminal; when the power supply circuit of the drive coil is off, the common contact is connected to the second switching contact to output a closing status detection signal through the second detection terminal.

[0007] The above technical solution has the following advantages or beneficial effects: This application realizes real-time monitoring of the status of the shunt trip unit through the cooperation of auxiliary contacts, the first detection terminal and the second detection terminal. It can automatically switch the detection signal when the power supply status of the drive coil changes, thereby providing clear feedback on the opening and closing status and improving the safety and maintainability of the system.

[0008] In some embodiments of this application, the shunt trip unit further includes: a first terminal block, one end of which is connected to the drive coil and the other end of which is connected to the control unit; and a second terminal block, which is connected to the power supply.

[0009] The above technical solution has the following advantages or beneficial effects: the control unit and the power supply are connected through the first terminal and the second terminal respectively, which facilitates connection with different control components and improves the flexibility of the shunt trip unit.

[0010] In some embodiments of this application, the control unit includes: a relay, one end of a set of normally open contacts of the relay is connected to the drive coil via the first terminal, and the other end is grounded; the control unit receives a circuit breaker control signal, the relay coil of the relay is energized, the normally open contacts of the relay are closed, and the power supply circuit of the drive coil is turned on through the first terminal and the second terminal.

[0011] The above technical solution has the following advantages or beneficial effects: the relay provides electrical isolation between the circuit breaker control signal and the shunt trip unit, preventing high voltage or strong current from directly affecting the control terminal that generates the circuit breaker control signal. The relay can switch quickly, ensuring timely response to detected faults.

[0012] In some embodiments of this application, the control unit further includes: an amplifier circuit, the amplifier circuit including at least one transistor, the control terminal of the transistor receiving the circuit breaker control signal, one end of the switching path of the transistor being connected to the relay coil, and the other end being grounded; when the switching path of the transistor is closed, the relay coil of the relay is energized, the normally open contact of the relay is closed, and the power supply circuit of the drive coil is turned on through the first terminal and the second terminal.

[0013] The above technical solution has the following advantages or beneficial effects: by using an amplifier circuit, low-power control signals can drive high-power relays, thereby improving response speed and reliability.

[0014] In some embodiments of this application, the control unit further includes: a redundancy protection circuit, the output of which is connected to the input of the amplifier circuit. The redundancy protection circuit includes: a first input for inputting a hardware protection signal; and a second input for inputting a software protection signal. The redundancy protection circuit is configured to output the circuit-breaking protection signal to the input of the amplifier circuit when a hardware protection signal is input at the first input or a software protection signal is input at the second input.

[0015] The above technical solution has the following advantages or beneficial effects: the redundant protection circuit integrates the protection mechanism implemented by hardware and the protection mechanism implemented by software logic at the remote control terminal. When either one fails, the relay is triggered, thereby improving system security.

[0016] In some embodiments of this application, the detection unit includes: a first detection circuit electrically connected to the first detection terminal, the first detection circuit being configured to sample the open state detection signal via a first optocoupler.

[0017] The above technical solution has the following advantages or beneficial effects: through the first detection circuit, electrical isolation between input and output is achieved, effectively preventing interference and noise between circuits, and improving the stability of signal detection and transmission.

[0018] In some embodiments of this application, the detection unit includes: a second detection circuit electrically connected to the second detection terminal, the second detection circuit being configured to sample the closed-state detection signal via a second optocoupler.

[0019] The above technical solution has the following advantages or beneficial effects: through the second detection circuit, electrical isolation between input and output is achieved, effectively preventing interference and noise between circuits, and improving the stability of signal detection and transmission.

[0020] In some embodiments of this application, the power supply is a DC power supply or an AC power supply.

[0021] The above technical solution has the following advantages or beneficial effects: the shunt trip unit can be adapted to DC power supply or AC power supply, and has good flexibility.

[0022] A second aspect of this application provides a power supply comprising: a circuit breaker for interrupting current; a shunt trip unit comprising: a tripping mechanism movably disposed within the shunt trip unit; a drive coil that, when energized, activates a magnetic field to drive the tripping mechanism to actuate and disconnect the circuit breaker; the shunt trip unit further comprising: auxiliary contacts comprising: a common contact electrically connected to a power supply; a first switching contact, one path of which is electrically connected to the drive coil and the other path to a first detection terminal; a second switching contact connected to a second detection terminal; a control unit for receiving a circuit breaker control signal to drive the power supply circuit of the drive coil to conduct; and a detection unit for acquiring a tripping status detection signal through the first detection terminal when the power supply circuit of the drive coil is conducting; or acquiring a closing status detection signal through the second detection terminal when the power supply circuit of the drive coil is not conducting.

[0023] The above technical solution has the following advantages or beneficial effects: The power supply system provided in this application integrates circuit breakers, shunt trip units, control units and detection units to realize automated monitoring and precise control of the circuit breaker status. It has the advantages of rapid response and reliable operation. When the drive coil is energized, it can provide real-time feedback on the opening and closing status through auxiliary contacts and detection terminals, thereby improving the safety and operating efficiency of the system.

[0024] A second aspect of this application provides an air conditioner, including a power supply system and a protection device.

[0025] The above technical solution has the following advantages or beneficial effects: the air conditioner provided in this application has a higher power safety level.

[0026] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a shunt trip unit provided in some embodiments of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a shunt trip unit provided in some embodiments of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of a shunt trip unit provided in some embodiments of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of a shunt trip unit provided in some embodiments of the present invention;

[0032] Figure 5 This is a schematic diagram of the interface structure of the shunt trip unit provided in some embodiments of the present invention;

[0033] Figure 6 This is a schematic diagram of the interface structure of the shunt trip unit provided in some embodiments of the present invention;

[0034] Figure 7 Circuit diagrams of the control unit in the shunt trip unit provided in some embodiments of this utility model;

[0035] Figure 8 Circuit diagrams of the control unit in the shunt trip unit provided in some embodiments of this utility model;

[0036] Figure 9 Circuit diagrams of the control unit in the shunt trip unit provided in some embodiments of this utility model;

[0037] Figure 10 A circuit diagram of the first detection circuit in the shunt trip unit provided in some embodiments of this utility model;

[0038] Figure 11 A circuit diagram of the first detection circuit in the shunt trip unit provided in some embodiments of this utility model;

[0039] Figure 12 A circuit diagram of the first detection circuit in the shunt trip unit provided in some embodiments of this utility model;

[0040] Figure 13 A circuit diagram of the second detection circuit in a shunt trip unit provided in some embodiments of this utility model;

[0041] Figure 14 A circuit diagram of the second detection circuit in a shunt trip unit provided in some embodiments of this utility model;

[0042] Figure 15 A circuit diagram of the second detection circuit in a shunt trip unit provided in some embodiments of this utility model;

[0043] Figure 16 A circuit diagram of the first detection circuit in the shunt trip unit provided in some embodiments of this utility model;

[0044] Figure 17 A circuit diagram of the first detection circuit in the shunt trip unit provided in some embodiments of this utility model;

[0045] Figure 18 A circuit diagram of the first detection circuit in the shunt trip unit provided in some embodiments of this utility model;

[0046] Figure 19 A circuit diagram of the second detection circuit in a shunt trip unit provided in some embodiments of this utility model;

[0047] Figure 20 A circuit diagram of the second detection circuit in a shunt trip unit provided in some embodiments of this utility model;

[0048] Figure 21 A circuit diagram of the second detection circuit in a shunt trip unit provided in some embodiments of this utility model;

[0049] Figure 22Schematic block diagrams of the power supply system provided in some embodiments of this utility model;

[0050] Figure 23 This is a schematic block diagram of the structure of an air conditioner provided in some embodiments of the present invention. Detailed Implementation

[0051] 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 some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0057] The first aspect of this application provides a shunt trip device.

[0058] A shunt trip unit is a power protection device used to control circuit breakers or other switching equipment in an electrical system to cut off the power supply in the event of overload, short circuit or other abnormal conditions of the electrical equipment, thereby protecting the safe operation of the equipment.

[0059] From a principle perspective, a shunt trip unit is driven by a control unit; the shunt trip unit internally contains a movable tripping mechanism. The control unit receives control signals from the control terminal and further drives the tripping mechanism to actuate, thereby converting the electrical signal into a mechanical action to disconnect the circuit breaker and cut off the power supply. The control terminal is typically a remote control terminal, such as in a control room or other communication-connected automation system.

[0060] like Figure 1 and Figure 2As shown, the shunt trip unit 10 also includes a drive coil 100. The control unit receives a control signal from the control terminal, energizing the drive coil 100. When the drive coil 100 is energized, it activates a magnetic field, and the resulting electromagnetic force changes the working position of the tripping mechanism (e.g., a push rod or iron core), thus breaking the circuit breaker. When the coil is de-energized, the activated magnetic field disappears, the tripping mechanism returns to its initial position, and the circuit breaker can be automatically reset or manually reset to restore normal circuit operation. In this way, the shunt trip unit 10 can quickly cut off the power supply when the circuit is abnormal and restore normal operation after the fault is repaired.

[0061] In this application, the status of the trip unit itself is detected through an auxiliary contact 101, a first detection terminal 12, and a second detection terminal 14. Specifically, the auxiliary contact 101 includes: a common contact C01, a first switching contact P01, and a second switching contact P02; the common contact C01 is electrically connected to the power supply; one path of the first switching contact P01 is electrically connected to the drive coil 100, and the other path is connected to the first detection terminal 12; the second switching contact P02 is connected to the second detection terminal 14. When the power supply circuit of the drive coil 100 is on, the common contact C01 is connected to the first switching contact P01 to output a trip status detection signal through the first detection terminal 12; when the power supply circuit of the drive coil 100 is not on, the common contact C01 is connected to the second switching contact P02 to output a closing status detection signal through the second detection terminal 14.

[0062] This application achieves real-time monitoring of the status of the shunt trip unit 10 through the cooperation of the auxiliary contact 101, the first detection terminal 12, and the second detection terminal 14. It can automatically switch the detection signal when the power supply status of the drive coil 100 changes, thereby providing clear feedback on the opening and closing status and improving the safety and maintainability of the system.

[0063] In some embodiments of this application, the shunt trip unit 10 further includes a first terminal C1 and a second terminal C2. The first terminal C1, the second terminal C2, the first detection terminal 12, and the second detection terminal 14 can be located at the same interface (e.g., ...). Figure 5 The first interface CN1 or Figure 6 The interface can be set to the second interface CN2 (as shown in the diagram) or on the same interactive interface, or on different interactive interfaces, to facilitate wiring operations. A grounding terminal can also be set on the interface.

[0064] The first terminal C1 is electrically connected to the control unit. The control unit includes a relay RY5. One end of a set of normally open contacts of the relay RY5 is electrically connected to the drive coil 100 via the first terminal C1, and the other end is grounded.

[0065] The second terminal C2 is connected to the power supply. The power supply can be a DC power supply (e.g., +24V, with the ground terminal grounded) or an AC power supply (e.g., the live wire L of the AC power supply, with the ground terminal connected to the neutral wire N of the AC power supply). Correspondingly, the drive coil 100 can be a coil adapted to the DC power supply (e.g., ...). Figure 1 and Figure 2 (as shown in L), or select a coil compatible with the AC power supply (such as...). Figure 3 or Figure 4 (As shown in the middle Y).

[0066] When the control unit receives the circuit breaker control signal RLY5, the coil of relay RY5 is energized, and the normally open contact of relay RY5 closes. Through the first terminal C1 and the second terminal C2, the power supply circuit of drive coil 100 is connected, realizing the shunt trip of the circuit breaker. When the circuit breaker control signal RLY5 is no longer generated or a recovery control signal is received, the coil of relay RY5 is de-energized, the normally open contact of relay RY5 opens, the power supply circuit of drive coil 100 is disconnected, the circuit breaker resets, and the equipment power supply returns to normal operation.

[0067] In some embodiments of this application, the control unit further includes an amplifier circuit comprising active elements. If the output current of the circuit-breaking control signal RLY5 received from the control terminal is insufficient to directly drive the coil of relay RY5, the amplifier circuit amplifies the circuit-breaking control signal RLY5 to provide sufficient current to drive the coil of relay RY5.

[0068] In some embodiments of this application, the active element is a transistor. The transistor can isolate the circuit-breaking control signal RLY5 from the coil of relay RY5, preventing the back electromotive force generated when relay RY5 is energized from damaging other circuit components, thereby protecting the circuit. One end of the transistor's switching path is connected to the coil of relay RY5, and the other end is grounded; when the transistor's switching path is closed, the coil of relay RY5 is energized, the normally open contact of relay RY5 closes, and the power supply circuit of drive coil 100 is turned on through the first terminal C1 and the second terminal C2.

[0069] In some embodiments of this application, such as Figure 7 As shown, an NPN transistor will be used as an example. Of course, other components can also be used for transistors, such as MOS FETs.

[0070] The base of the NPN transistor Q26 is connected to the circuit breaker control signal RLY5, the emitter is grounded, and the collector is connected to one end of the coil of relay RY5. The other end of the coil of relay RY5 is electrically connected to the power supply (+12V).

[0071] A freewheeling diode D4 is connected in parallel across relay RY5. D4 protects the transistor from high-voltage spikes from inductive loads. The base of NPN transistor Q26 is also connected to the power supply (+5V) via pull-up resistor R165C to provide bias current and ensure that Q26 operates in the correct region. When there is no circuit breaker control signal RLY5, Q26 is in the off state.

[0072] When a valid circuit breaker control signal RLY5 (high level signal) is input, NPN transistor Q26 conducts, the coil of relay RY5 is energized, and the normally open contact of relay RY5 closes. When no valid circuit breaker control signal RLY5 is input (low level signal), NPN transistor Q26 is cut off, the coil of relay RY5 is not energized, and the normally open contact of relay RY5 remains open.

[0073] like Figure 8 As shown, in some other embodiments of this application, the amplifier circuit includes a cascaded first NPN transistor Q27 and a second NPN transistor Q26; the base of the first NPN transistor Q27 receives a circuit breaker control signal RLY5, its emitter is grounded, and its collector is connected to the base of the second NPN transistor Q26; the emitter of the second NPN transistor Q26 is grounded, and its collector is connected to one end of the coil of relay RY5, the other end of the coil of relay RY5 is electrically connected to the power supply (+12V). A freewheeling diode D4 is connected in parallel across the two ends of relay RY5. The bases of the first NPN transistor Q27 and the second NPN transistor Q26 are connected to the power supply terminal (+5V) through a first pull-up resistor R164C and a second pull-up resistor R165C, respectively.

[0074] When a valid circuit breaker control signal RLY5 (low level signal) is input, the first NPN transistor Q27 is in the off state, the second NPN transistor Q26 is in the on state, the coil of relay RY5 is energized, and the normally open contact of relay RY5 is closed. When no valid circuit breaker control signal RLY5 is input (high level signal), the first NPN transistor Q27 is in the on state, the second NPN transistor Q26 is in the off state, the coil of relay RY5 is not energized, and the normally open contact of relay RY5 remains open.

[0075] like Figure 9As shown, in some other embodiments of this application, the control unit further includes: a redundancy protection circuit, the output of which is connected to the input of the amplifier circuit. The redundancy protection circuit includes: a first input and a second input. The first input is used to input a hardware protection signal LCP4 Hard; the second input is used to input a software protection signal RLY5. The redundancy protection circuit is configured to output a circuit breaker protection signal to the input of the amplifier circuit when the hardware protection signal LCP4 Hard is input at the first input or the software protection signal RLY5 is input at the second input.

[0076] The hardware protection signal LCP4 Hard is a protection mechanism implemented through physical circuitry. When the circuit state changes, it automatically generates the hardware protection signal LCP4 Hard and outputs it to the control unit. For example, the input terminal of the hardware protection signal LCP4 Hard can be directly connected to components such as pressure switches and temperature switches. When these components detect an abnormal situation, they change their state, for example, from closed to open, and generate a voltage level signal. This signal can then be directly transmitted to the hardware protection signal input terminal, further triggering the relay RY5 to operate.

[0077] The software protection signal RLY5 is a protection mechanism implemented through software logic on the remote control terminal. For example, on the remote control terminal, when an anomaly is detected based on preset condition judgment and execution results, the software protection signal RLY5 is automatically generated and output to the software protection signal input terminal, which further triggers the relay RY5 to operate.

[0078] In some embodiments of this application, both the hardware protection signal LCP4 Hard and the software protection signal RLY5 are active low.

[0079] In some embodiments of this application, the hardware protection signal LCP4 Hard and the software protection signal RLY5 are connected via an OR logic relationship. When either the hardware protection signal LCP4 Hard or the software protection signal RLY5 is detected, the relay RY5 is activated. The control unit includes an OR gate circuit VD28, which includes a first diode and a second diode. The cathodes of the first and second diodes are the two input terminals of the OR gate circuit VD28. For example, the cathode of the first diode receives the hardware protection signal LCP4 Hard, and the cathode of the second diode receives the software protection signal RLY5. The anodes of the first and second diodes are connected to the base of a first NPN transistor Q27, and the anodes of the first and second diodes are the output terminals of the OR gate circuit VD28. When either input terminal is low, the output of the OR gate circuit VD28 is low, i.e., a valid circuit breaker control signal RLY5. When the output of OR gate VD28 is at a low level, the voltage connected to the base of the first NPN transistor Q27 is also low. The base voltage of the first NPN transistor Q27 is insufficient to turn it on, and Q27 remains off. Since the collector voltage of the first NPN transistor Q27 is pulled high to +5V, the base voltage of the second NPN transistor Q26 is sufficiently high, causing Q26 to turn on. This energizes the coil of relay RY5, and the normally open contact of relay RY5 closes.

[0080] When the power supply circuit of the drive coil 100 is turned on, the common contact C01 is electrically connected to the first switching contact P01. The first detection terminal 12 is provided with a first indicator LED10, which lights up when powered on.

[0081] When the power supply circuit of the drive coil 100 is disconnected, the common contact C01 is electrically connected to the second switching contact P02, and the second detection terminal 14 is provided with the second indicator LED11, which lights up when powered on.

[0082] The current status of the shunt trip unit 10 can be obtained through the first indicator LED10 and the second indicator LED11.

[0083] The current state of the shunt trip unit 10 can be acquired by a detection unit. The detection unit includes a first detection circuit and a second detection circuit. The first detection circuit is electrically connected to the first detection terminal 12 and is configured to sample the tripping state detection signal through the first optocoupler PC7. The second detection circuit is electrically connected to the second detection terminal 14 and is configured to sample the closing state detection signal through the second optocoupler.

[0084] The first indicator light LED10 and the second indicator light LED11 are both LEDs.

[0085] In some embodiments of this application, the first optocoupler PC7 includes a first light-emitting diode and a first phototransistor.

[0086] like Figure 10 As shown, the first detection circuit also includes a first protection resistor R33C on the input side, and a first output transistor Q28, a first output pull-up resistor R173C, a first voltage divider resistor R174C, a second voltage divider resistor R175C, and a first capacitor C19 on the output side. One end of the first protection resistor R33C is connected to the first detection terminal 12, and the other end is connected to the anode of the first light-emitting diode. The cathode of the first light-emitting diode is connected to the anode of the first indicator LED10, and the cathode of the first indicator LED10 is grounded. The collector of the first phototransistor is connected to the power supply terminal (+5V) via the first output-side pull-up resistor R173C, and the other path is connected to the base of the first output-side transistor Q28. The collector of the first output-side transistor Q28 is connected to a voltage divider network composed of the first voltage divider resistor R174C and the second voltage divider resistor R175C. Specifically, the collector of the first output-side transistor is connected to the power supply terminal (+5V) via the first voltage divider resistor R174C, and the other path is connected to the output terminal via the second voltage divider resistor R175C. The positive terminal of the first capacitor C19 is connected to the second voltage divider resistor R175C via one path and to the output terminal via the other path. The negative terminal of the first capacitor C19 is grounded. When the drive coil 100 is energized, the power supply circuit through the first detection terminal 12 is turned on, and the current flows through the first protection resistor R33C, the first light-emitting diode, and the first indicator LED10. When the first indicator LED10 illuminates, the first phototransistor inside the first optocoupler PC7 detects the light signal and conducts, causing the base voltage of the first output-side transistor Q28 to decrease and Q28 to turn off. The voltage divider network composed of the first voltage divider resistor R174C and the second voltage divider resistor R175C outputs a high level. The subsequent processor (e.g., an MCU chip) acquires this high-level signal through its output, indicating that the shunt trip unit 10 is in the open state.

[0087] like Figure 11 As shown, in some other embodiments of this application, the first detection circuit can also be used in... Figure 10Based on the simplified circuit diagram, specifically, besides the first optocoupler PC7, the first detection circuit includes a first protection resistor R33C on the input side, and a first output pull-up resistor R173C, a first voltage divider resistor R175C, and a first capacitor C19 on the output side. One end of the first protection resistor R33C is connected to the first detection terminal 12, and the other end is connected to the anode of the first light-emitting diode (LED). The cathode of the first LED is connected to the anode of the first indicator LED10, and the cathode of the first indicator LED10 is grounded. The collector of the first phototransistor is connected to the power supply terminal (+5V) through the first output pull-up resistor R173C, and to the output terminal through the first voltage divider resistor R175C. The positive terminal of the first capacitor C19 is connected to the first voltage divider resistor R175C through one path and to the output terminal through the other path; the negative terminal of the first capacitor C19 is grounded. When the first phototransistor is turned on, the output terminal will also output a corresponding level signal. The subsequent processor collects a valid level signal through the output terminal, indicating that the shunt trip unit 10 is in the open state.

[0088] like Figure 12 As shown, in some embodiments of this application, the first detection circuit can also adopt a simplified structure. Specifically, one end of the first protection resistor R33C is connected to the first detection terminal 12, and the other end is connected to the anode of the first light-emitting diode (LED). The cathode of the first LED is grounded. That is, at the input of the first detection circuit, the first LED in the first optocoupler PC7 is used as an indicator. When the first LED is lit, the first phototransistor inside the first optocoupler PC7 can also conduct. In this way, on the output side, the subsequent processor can collect the corresponding valid level signal to detect the open state of the shunt trip unit 10.

[0089] In some embodiments of this application, the detection unit includes a second detection circuit.

[0090] The second detection circuit includes a second optocoupler PC8, which is used to detect the closing status of the shunt trip unit 10.

[0091] The second optocoupler PC8 includes a second light-emitting diode and a second phototransistor.

[0092] like Figure 13As shown, the second detection circuit also includes a second protection resistor R36C on the input side, and a second output transistor Q29, a second output pull-up resistor R168C, a third voltage divider resistor R169C, a fourth voltage divider resistor R170C, and a second capacitor C21 on the output side. One end of the second protection resistor R36C is connected to the second detection terminal 14, and the other end is connected to the anode of the second light-emitting diode. The cathode of the second light-emitting diode is connected to the anode of the second indicator LED11, and the cathode of the second indicator LED11 is grounded. The collector of the second phototransistor is connected to the power supply terminal (+5V) via the second output-side pull-up resistor R1 68C, and the other path is connected to the base of the second output-side transistor Q29. The collector of the second output-side transistor Q29 is connected to a voltage divider network composed of the third voltage divider resistor R1 69C and the fourth voltage divider resistor R1 70C. Specifically, the collector of the second output-side transistor is connected to the power supply terminal (+5V) via the third voltage divider resistor R1 69C, and the other path is connected to the output terminal via the fourth voltage divider resistor R1 70C. The positive terminal of the second capacitor C21 is connected to the fourth voltage divider resistor R1 70C via one path and to the output terminal via the other path. The negative terminal of the second capacitor C21 is grounded. When the drive coil 100 is energized, the power supply circuit through the second detection terminal 14 is turned on, and the current flows through the second protection resistor R36C, the second light-emitting diode, and the second indicator LED11. When the second indicator LED11 lights up, the second phototransistor inside the second optocoupler PC8 detects the light signal and conducts. The base voltage of the second output transistor Q29 decreases, causing Q29 to turn off. The voltage divider network composed of the third and fourth voltage divider resistors R169C and R170C outputs a high level. The subsequent processor (e.g., an MCU chip) acquires the high-level signal through its output, indicating that the shunt trip unit 10 is in the closed state.

[0093] like Figure 14As shown, in some other embodiments of this application, the second detection circuit can also adopt a simplified structure. Specifically, in addition to the second optocoupler PC8, the second detection circuit also includes a second protection resistor R36C on the input side, and a second output pull-up resistor R168C, a third voltage divider resistor R170C, and a second capacitor C21 on the output side. One end of the second protection resistor R36C is connected to the second detection terminal 14, and the other end is connected to the anode of the second light-emitting diode. The cathode of the second light-emitting diode is connected to the anode of the second indicator LED11, and the cathode of the second indicator LED11 is grounded. One path of the collector of the second phototransistor is connected to the power supply terminal (+5V) through the second output pull-up resistor R168C, and the other path is connected to the output terminal through the third voltage divider resistor R170C. One path of the positive terminal of the second capacitor C21 is connected to the third voltage divider resistor R170C, and the other path is connected to the output terminal. The negative terminal of the second capacitor C21 is grounded. When the second phototransistor is turned on, the output terminal will also output a corresponding level signal. The subsequent processor collects a valid level signal through the output terminal, indicating that the shunt trip unit 10 is in the closed state.

[0094] like Figure 15 As shown, in some other embodiments of this application, the second detection circuit can also adopt a simplified structure. Specifically, one end of the second protection resistor R36C is connected to the second detection terminal 14, and the other end is connected to the anode of the second light-emitting diode, while the cathode of the second light-emitting diode is grounded. That is, at the input end of the second detection circuit, the second light-emitting diode in the second optocoupler PC8 is used as an indicator. When the second light-emitting diode is lit, the second phototransistor inside the second optocoupler PC8 can also conduct. In this way, on the output side, the subsequent processor can collect the corresponding effective level signal to detect the closing state of the shunt trip unit 10.

[0095] like Figure 16As shown, in some embodiments of this application, when the first terminal C1 is connected to an AC power supply, the first detection circuit is designed as follows: The first detection circuit includes a first current-limiting resistor R171 located on the input side. The first end of the first current-limiting resistor R171 is connected to the first detection terminal 12, and the second end is connected to a first protection resistor R172. The second end of the first protection resistor R172 is grounded. The first protection resistor R172 is connected in parallel with the first indicator LED10. The first end of the first protection resistor R172 is connected to the cathode of the first indicator LED10, and the second end of the first protection resistor R172 is connected to the anode of the first indicator LED10. The first indicator LED10 is connected in parallel with the first light-emitting diode in the first optocoupler PC2. The cathode of the first indicator LED10 is connected to the anode of the first light-emitting diode, and the anode of the first indicator LED10 is connected to the cathode of the first light-emitting diode. The first indicator LED10 and the first light-emitting diode are clamped together and will not be damaged due to reverse voltage. The first indicator LED10 can also provide further protection. When the first light-emitting diode is turned on, the first phototransistor is turned on. The output-side circuit design can remain unchanged, choosing either a circuit design with or without the first output-side transistor Q17, such as... Figure 16 and Figure 17 As shown. The subsequent processor acquires a valid level signal through the output terminal, which indicates that the shunt trip unit 10 is in the open state.

[0096] like Figure 18 As shown, in some embodiments of this application, the first detection circuit can also employ a simplified design. The first detection circuit includes a first current-limiting resistor R171 located on the input side. The first end of the first current-limiting resistor R171 is connected to the first detection terminal 12, and the second end is connected to a first protection resistor R172. The second end of the first protection resistor R172 is grounded. The first protection resistor R172 is connected in parallel with the first light-emitting diode in the first optocoupler PC2. The first end of the first protection resistor R172 is connected to the anode of the first light-emitting diode, and the second end of the first protection resistor R172 is connected to the cathode of the first light-emitting diode.

[0097] like Figure 19As shown, in some embodiments of this application, when the second terminal C2 is connected to an AC power supply, the second detection circuit is designed as follows: The second detection circuit includes a second current-limiting resistor R166 located on the input side. The first end of the second current-limiting resistor R166 is connected to the second detection terminal 14, and the second end is connected to a second protection resistor R167. The second end of the second protection resistor R167 is grounded. The second protection resistor R167 is connected in parallel with the second indicator LED11. The first end of the second protection resistor R167 is connected to the cathode of the second indicator LED11, and the second end of the second protection resistor R167 is connected to the anode of the second indicator LED11. The second indicator LED11 is connected in parallel with the second light-emitting diode in the second optocoupler PC1. The cathode of the second indicator LED11 is connected to the anode of the second light-emitting diode, and the anode of the second indicator LED11 is connected to the cathode of the second light-emitting diode. The second indicator LED11 and the second light-emitting diode are clamped together and will not be damaged by reverse voltage. The second indicator LED11 also provides further protection. When the second light-emitting diode is turned on, the second phototransistor is turned on. The output-side circuit design can remain unchanged. You can choose a circuit design with or without the first output-side transistor Q16. The corresponding pull-up resistors R168 and R169 and the voltage divider resistor R180 are similar to the second detection circuit using DC power, and will not be described in detail here. Figure 19 and Figure 20 As shown. The subsequent processor acquires a valid level signal through the output terminal, which indicates that the shunt trip unit 10 is in the open state.

[0098] like Figure 21 As shown, in some embodiments of this application, the second detection circuit can also employ a simplified design. The second detection circuit includes a second current-limiting resistor R166 located on the input side. The first end of the second current-limiting resistor R166 is connected to the second detection terminal 14, and the second end is connected to a second protection resistor R167. The second end of the second protection resistor R167 is grounded. The second protection resistor R167 is connected in parallel with the second light-emitting diode in the second optocoupler PC1. The first end of the second protection resistor R167 is connected to the anode of the second light-emitting diode, and the second end of the second protection resistor R167 is connected to the cathode of the second light-emitting diode.

[0099] like Figure 22 As shown, a second aspect of this application provides a power supply system 2. The power supply system 2 includes a circuit breaker 203, a shunt trip unit 20, a control unit 204, and a detection unit 205. The shunt trip unit 20 includes a tripping mechanism 202 and a drive coil 200. When energized, the drive coil 200 activates a magnetic field to drive the tripping mechanism 202 to actuate and disconnect the circuit breaker 203.

[0100] like Figure 22As shown, the shunt trip unit 20 also includes an auxiliary contact 201. The auxiliary contact 201 includes: a common contact C01, which is electrically connected to the power supply; a first switching contact P01, one of which is electrically connected to the drive coil 200 and the other is connected to the first detection terminal 12; and a second switching contact P02, which is connected to the second detection terminal 14.

[0101] The control unit 204 is used to receive a circuit breaker control signal to drive the power supply circuit of the drive coil 200 to conduct. The detection unit 205 is used to acquire a tripping status detection signal through the first detection terminal 12 when the power supply circuit of the drive coil 200 is conducting; or to acquire a closing status detection signal through the second detection terminal 14 when the power supply circuit of the drive coil 200 is not conducting.

[0102] The power supply system 2 provided in this application integrates a circuit breaker 203, a shunt trip unit 20, a control unit 204, and a detection unit 205 to achieve automated monitoring and precise control of the status of the circuit breaker 203. It has the advantages of rapid response and reliable operation. When the drive coil 200 is energized, it can provide real-time feedback on the opening and closing status through the auxiliary contact 201 and the detection terminal, thereby improving the safety and operating efficiency of the system.

[0103] like Figure 23 As shown, a third aspect of this application provides an air conditioner 3, including a power supply system 2.

[0104] The power supply system 2 includes: a circuit breaker 203, a shunt trip unit 20, a control unit 204, and a detection unit 205. The shunt trip unit 20 includes: a tripping mechanism 202 and a drive coil 200. When energized, the drive coil 200 activates a magnetic field to drive the tripping mechanism 202 to actuate and disconnect the circuit breaker 203.

[0105] like Figure 22 As shown, the shunt trip unit 20 also includes an auxiliary contact 201. The auxiliary contact 201 includes: a common contact C01, which is electrically connected to the power supply; a first switching contact P01, one of which is electrically connected to the drive coil 200 and the other is connected to the first detection terminal 12; and a second switching contact P02, which is connected to the second detection terminal 14.

[0106] The control unit 204 is used to receive a circuit breaker control signal to drive the power supply circuit of the drive coil 200 to conduct. The detection unit 205 is used to acquire a tripping status detection signal through the first detection terminal 12 when the power supply circuit of the drive coil 200 is conducting; or to acquire a closing status detection signal through the second detection terminal 14 when the power supply circuit of the drive coil 200 is not conducting.

[0107] The air conditioner 3 also includes a protection device 4, which generates a circuit breaker control signal. The protection device 4 can be a temperature switch, pressure switch, current monitoring circuit, voltage monitoring circuit, controller, and fault detection module within the air conditioner. The temperature switch, pressure switch, current monitoring circuit, and voltage monitoring circuit can all generate hardware protection signals, while the controller and fault detection module can generate software protection signals. This protects the air conditioner 3, especially large air conditioners 3, by ensuring safe operation when an anomaly or potential risk is detected.

[0108] Air conditioner 3 can be a photovoltaic air conditioner or a DC air conditioner.

[0109] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0110] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included 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. A shunt trip unit, comprising: A tripping mechanism, which is movably disposed in the shunt trip unit; A drive coil, which, when energized, activates a magnetic field to drive the tripping mechanism to move the circuit breaker; Its characteristic is that it further includes: Auxiliary contacts, including: The common contact is electrically connected to the power supply. The first switching contact has one path electrically connected to the drive coil and the other path connected to the first detection terminal. The second switching contact is connected to the second detection terminal; When the power supply circuit of the drive coil is turned on, the common contact is connected to the first switching contact to output a tripping status detection signal through the first detection terminal; when the power supply circuit of the drive coil is not turned on, the common contact is connected to the second switching contact to output a closing status detection signal through the second detection terminal.

2. The shunt trip unit according to claim 1, characterized in that, Also includes: The first terminal has one end connected to the drive coil and the other end connected to the control unit; and The second terminal is connected to the power supply.

3. The shunt trip unit according to claim 2, characterized in that, The control unit includes: A relay, wherein one end of a set of normally open contacts of the relay is connected to the drive coil via the first terminal, and the other end is grounded; The control unit receives a circuit breaker control signal, the relay coil of the relay is energized, the normally open contact of the relay closes, and the power supply circuit of the drive coil is turned on through the first terminal and the second terminal.

4. The shunt trip unit according to claim 3, characterized in that, The control unit further includes: An amplifier circuit, comprising at least one transistor, wherein the control terminal of the transistor receives the circuit breaker control signal, one end of the switching path of the transistor is connected to the relay coil, and the other end is grounded; when the switching path of the transistor is closed, the relay coil of the relay is energized, the normally open contact of the relay is closed, and the power supply circuit of the drive coil is turned on through the first terminal and the second terminal.

5. The shunt trip unit according to claim 4, characterized in that, The control unit further includes: A redundancy protection circuit, the output of which is connected to the input of the amplifier circuit, the redundancy protection circuit comprising: The first input terminal is used to input hardware protection signals; The second input terminal is used to input software protection signals; The redundancy protection circuit is configured to output a circuit breaker protection signal to the input terminal of the amplifier circuit when a hardware protection signal is input at the first input terminal or a software protection signal is input at the second input terminal.

6. The shunt trip unit according to any one of claims 2 to 5, characterized in that, Also includes: The detection unit includes: A first detection circuit is electrically connected to the first detection terminal, and the first detection circuit is configured to sample the open state detection signal through a first optocoupler.

7. The shunt trip unit according to any one of claims 2 to 5, characterized in that, Also includes: The detection unit includes: The second detection circuit is electrically connected to the second detection terminal, and the second detection circuit is configured to sample the closed state detection signal through the second optocoupler.

8. The shunt trip unit according to any one of claims 2 to 5, characterized in that, The power supply is either a DC power supply or an AC power supply.

9. A power supply, comprising: A circuit breaker is used to interrupt current. A shunt trip unit includes: A tripping mechanism, which is movably disposed in the shunt trip unit; A drive coil, when energized, activates a magnetic field to drive the tripping mechanism to disconnect the circuit breaker; The shunt trip unit is characterized in that it further includes: Auxiliary contacts, including: The common contact is electrically connected to the power supply. The first switching contact has one path electrically connected to the drive coil and the other path connected to the first detection terminal. The second switching contact is connected to the second detection terminal; A control unit for receiving a circuit breaker control signal to drive the power supply circuit of the drive coil to conduct; The detection unit is used to acquire a tripping status detection signal through the first detection terminal when the power supply circuit of the drive coil is turned on; or to acquire a closing status detection signal through the second detection terminal when the power supply circuit of the drive coil is not turned on.

10. An air conditioner, characterized in that, include: The power supply as described in claim 9; further comprising: A protection device for generating the circuit breaker control signal.

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