Molded case circuit breaker with built-in communication module and built-in electric operator

Abstract

The utility model discloses a molded case circuit breaker with a built-in communication module and an electric operator, which comprises a molded case circuit breaker body and an electric operator communication assembly arranged on an upper cover of the molded case circuit breaker body, and the electric operator communication assembly comprises an electric operator shell, a communication control module and an electric operator transmission module. A concentrator, a communication port and a health state indicating lamp are arranged on the electric operation shell, and the concentrator is arranged on one side, facing the molded case circuit breaker body, of the electric operation communication assembly and used for taking electricity from the molded case circuit breaker body to obtain the closing and opening states of the molded case circuit breaker; in the assembling state, the concentrator cannot be touched; the communication control module is connected with the electric operation transmission module and executes electric operation closing and opening driving; communication connection with external equipment is realized through the communication port; and driving the health state indicator lamp. The molded case circuit breaker has the advantages of communication capability, simple structure, electric operation self-power supply, self-driving, self-power-off and the like, and is more convenient for a user to use; meanwhile, the safety is high, and electricity larceny is prevented.

Description

Technical Field

[0001] The utility model relates to the field of molded case circuit breakers, in particular to a molded case circuit breaker with a built-in communication module and an electric operating mechanism. Background Art

[0002] The electric operating mechanism of a circuit breaker is an accessory used to control the closing and opening of the circuit breaker, hereinafter referred to as the electric operator for short. The traditional electric operator is installed outside the molded case circuit breaker and uses open and closed contacts for control.

[0003] The traditional electric operator is generally used to locally control the closing and opening of the circuit breaker, that is, the circuit breaker and the electric operator are installed in the cabinet or the drawer cabinet, and the control part is installed on the cabinet door. If remote control is to be achieved, the circuit breaker needs to be upgraded to an electronic circuit breaker with communication function, and then a communication module with relay output is added. The control center communicates with the electronic circuit breaker, and the electronic circuit breaker sends a control command to the communication module. The communication module controls the electric operator through the relay contacts, and the process is very cumbersome. When the traditional electric operator and the circuit breaker are used in the fee control circuit, due to its simple working principle, others can privately control the closing of the electric operator to steal electricity, and it does not have the function of preventing electricity theft.

[0004] The wiring of the traditional electric operator is complex: 1. The user needs to externally connect an AC220V or AC380V power supply to the electric operator to drive the internal motor; 2. The user needs to externally connect a wire to the control interface of the electric operator and use the open and closed contact method for conduction control; 3. After the electric operator closes / opens the circuit breaker in place, the power supply of the electric operator needs to be disconnected to prevent the motor from overheating and burning due to continuous power supply. The user needs to use another set of accessories of the circuit breaker, the auxiliary contact output, to cut off the power supply of the electric operator. The wiring work amount is large. Content of the Utility Model

[0005] The utility model aims to provide a molded case circuit breaker with a built-in communication module and an electric operator to solve at least one of the above technical problems. The technical solutions are as follows:

[0006] A molded case circuit breaker with a built-in communication module and an electric operator includes a molded case circuit breaker body and an electric operator communication component arranged on its upper cover.

[0007] The electric operator communication component includes an electric operator housing, and a communication control module and an electric operator drive module arranged in the electric operator housing.

[0008] One hub, one communication port and one health status indicator are arranged on the electric operator housing.

[0009] The hub is arranged on the side of the electric operator communication component facing the molded case circuit breaker body, used to obtain power from the molded case circuit breaker body and acquire the closing and opening states of the molded case circuit breaker; in the assembled state, the hub is not accessible.

[0010] The communication control module is connected to the electric operation drive module to perform electric operation closing and opening drive; communicate with external devices through the communication port; and drive the health status indicator lamp.

[0011] Furthermore, the communication control module includes a power supply circuit, a microprocessor, a motor drive circuit, a circuit breaker status feedback circuit, a health status detection circuit, and a communication circuit connected to the microprocessor;

[0012] The power supply circuit draws power from the molded case circuit breaker body through the hub and supplies power to the entire communication control module;

[0013] The communication circuit is used to communicate with external devices;

[0014] The health status detection circuit is used to detect the grid voltage and drive the health status indicator lamp to display the grid voltage status;

[0015] The circuit breaker status feedback circuit is connected to the circuit breaker auxiliary contact through the hub to monitor the circuit breaker status and the electric operation drive module status;

[0016] The motor drive circuit is connected to the electric operation drive module and is used to drive the electric operation drive module to perform closing and opening actions.

[0017] Furthermore, the communication circuit adopts an RS485 transceiver circuit.

[0018] Furthermore, the motor drive circuit includes a first relay and a second relay. The first relay is a normally open type relay, including a normally open contact and a common terminal; the second relay is a changeover type relay, including a normally open contact, a normally closed contact, and a common terminal connection; the common terminal of the first relay is connected to the normally closed contact of the second relay; the normally open contact and the common terminal of the first relay, and the normally closed contact and the common terminal of the second relay are connected in series in the closing drive circuit; the normally open contact and the common terminal of the second relay are connected in series in the opening drive circuit.

[0019] Furthermore, the health status detection circuit includes: a rectifier circuit, a first voltage stabilizing circuit, a second voltage stabilizing circuit, a voltage sampling circuit, a comparator, a switching device, and the health status indicator lamp;

[0020] The rectifier circuit is connected to an external power supply and is used to output a first power supply;

[0021] The first voltage stabilizing circuit is used to draw power from the first power supply to generate a second power supply;

[0022] The second voltage stabilizing circuit is connected across the first power supply and the ground and is used to generate a reference voltage signal;

[0023] The voltage sampling circuit is connected across the first power supply and ground, and is used to output a voltage sampling signal of the first power supply;

[0024] For the comparator, its positive input terminal inputs the voltage sampling signal, its negative input terminal inputs the reference voltage signal, and its output terminal is connected to the health status indicator through the main circuit of the switching device, and the other end of the health status indicator is grounded;

[0025] The control circuit of the switching device is connected to an external control signal; the health status indicator is only lit when the main circuit of the switching device is turned on and the output of the comparator is at a high level.

[0026] Further, the rectification circuit is a half-bridge rectification circuit.

[0027] Further, the switching device is one of a relay, an optocoupler, a triode, and a MOS transistor.

[0028] Further, the main circuit of the switching device is set to a normally closed state.

[0029] The utility model achieves the following technical effects:

[0030] Adopting a compact design, the electric operation and communication control modules are combined and built into the molded case circuit breaker to form an integrated unit. The overall height is lower than the traditional design, the wiring is internalized, and only one communication line is reserved for external wiring. It has the advantages of simple structure, self-powered electric operation, self-driving, and self-power-off, making it more convenient for users; at the same time, it has high safety and anti-stealing of electricity. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of the molded case circuit breaker of the utility model;

[0032] Figure 2 is a schematic structural diagram of the electric operation of the utility model;

[0033] Figure 3 is a schematic diagram of the installation position of the hub of the utility model;

[0034] Figure 4 is a partially enlarged schematic diagram of the hub of the utility model;

[0035] Figure 5 is a functional block diagram of the communication control module;

[0036] Figure 6 is a circuit diagram of the closing and opening circuit;

[0037] Figure 7 is a circuit schematic diagram of the health detection circuit. Detailed Embodiments

[0038] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0039] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0040] like Figures 1 to 4 As shown, the utility model provides a molded case circuit breaker with built-in communication module and electric control, including a molded case circuit breaker body 10 and an electric control communication component 40 arranged at its upper cover, and the electric control communication component 40 is composed of an electric control housing 401, a communication control module 20, an electric control transmission module 30 and a hub 50. The electric control communication component 40 and the molded case circuit breaker body 10 are electrically connected through the hub 50, and the power supply and circuit breaker status signal are obtained from the molded case circuit breaker body 10. At the same time, a health status indicator light 402 is provided on the panel 401 of the electric control communication component 40 to provide an alarm indication function. The electric control communication component 40 is connected to the outside through a communication line 403. The molded case circuit breaker adopts a compact design, combining the electric control and communication control modules together and built into the molded case circuit breaker to make it an integrated type. The overall height is lower than the traditional design, the wiring is built-in, and only one communication line is retained for external wiring. It is more convenient for users to use.

[0041] The hub 50 is installed on the side of the electric control communication component 40 facing the molded case circuit breaker body 10. In the assembled state, the hub 50 is shielded by the electric control communication component 40 and cannot be touched, which can prevent electricity theft. The hub 50 brings together all the connection leads of the electric control communication component 40 and the molded case circuit breaker body 10, and has a high degree of integration. The hub 50 includes electrical terminals such as power input interfaces 501, 502, power output interfaces 503, 504, circuit breaker auxiliary contact input interfaces 505, 506, 507 and circuit breaker auxiliary contact output interfaces 508, 509, 510. Among them, the power input interfaces 501, 502 are connected to the A and B terminals of the circuit breaker body 10 to access the power grid, and the power output interfaces 503, 504 are connected to the electric control transmission module 30 to power the motor; at the same time, the power output interfaces 503, 504 are connected to the communication control module 20 to achieve self-power supply. The circuit breaker auxiliary contact input interfaces 505, 506, and 507 are used to connect to the closing and opening accessories and alarm accessories of the molded case circuit breaker, and receive the closing and opening status signals of the molded case circuit breaker. The circuit breaker auxiliary contact output interfaces 508, 509, and 510 are connected to the communication control module 20, and the communication control module 20 processes the uploaded circuit breaker status feedback.

[0042] As Figure 4 shown, the communication control module 20 is the control core of the electric operation communication component 40, and is composed of modules such as a processor unit 201, an RS485 transceiver circuit 202, a motor drive circuit 204, a breaker status feedback circuit 205, a health status detection circuit 206, a storage unit 207, and a power supply circuit 208. Among them, the RS485 transceiver circuit 202 uses an RJ45 interface as a communication interface for communicating with external devices such as a control center and a host computer, and communicates with the control center or the host computer via a communication line 403. The RS485 transceiver circuit 202 is connected to the processor unit 201 to convert the RS485 differential signal into a TTL signal for the processor unit 201 to process and analyze. The control center can directly communicate with the communication control module 20 through the communication line 403, and the electric operation directly responds to the instructions of the communication control module 20 to perform closing and opening operations. This not only simplifies the process, reduces equipment investment for users, and reduces the installation space in the cabinet, but also uses a communication method for the control mode, which cannot be tampered with at will by others, and has the advantages of high security and anti-stealing electricity.

[0043] The motor drive circuit 204 receives the electric operation control instruction from the processor unit 201, and the output end (i.e., the relay contact) of the motor drive circuit 204 is connected to the motor to drive the motor to rotate.

[0044] In this embodiment, the motor drive circuit 204 adopts a design combining two relays and is composed of resistors R15, R16, triodes Q1, Q2, diodes D1, D2, and relays K1, K2, etc. Among them, relay K1 is a normally open relay, and relay K2 is a changeover relay; the common terminal of relay K1 is connected to the normally closed contact of relay K2 and is marked as MO_COM1; the normally open contact MO_ON of relay K1, the common terminal MO_COM1, the normally closed contact MO_COM1 of relay K2, and the common terminal MO_COM are connected in series in the closing drive circuit (specifically, the normally open contact MO_ON of relay K1 is connected to a control terminal of the closing motor, the other control terminal of the closing motor is connected to the alternating current AC220-L, the common terminal MO_COM1 of relay K1 is connected to the common terminal MO_COM1 of relay K2, and the common terminal MO-COM of relay K2 is connected to the alternating current AC220-N); the normally open contact MO_OFF of relay K2 and the common terminal MO_COM are connected in series in the opening drive circuit (specifically, the common terminal MO-COM is connected to the alternating current AC220-N, the normally open contact MO_OFF is connected to a control terminal of the opening motor, and the other control terminal of the opening motor is connected to the alternating current AC220-L). After the electric operating mechanism closes / open the circuit breaker in place, it is necessary to disconnect the power supply of the electric operating mechanism to prevent the motor from overheating and burning due to continuous power supply. When the electric operating mechanism closes, it will output a closing control signal CON_ON to relay K1 to control the closing relay K1 to conduct and supply power to the closing motor. When the electric operating mechanism opens, it will output an opening control signal CON_OFF to relay K2 to control the opening relay K2 to conduct and switch the power supply of the electric operating mechanism to the off state. The advantage of this circuit is that after the closing or opening action of the electric operating mechanism is in place, the relay can be powered off and does not need to work with long-term power supply, which maximally extends the service life of the relay and improves reliability.

[0045] After the grid voltage is connected to the hub 50, one of the circuits supplies power to the electric operating mechanism motor, and the other circuit supplies power to the communication control module 20. The grid voltage value is detected by the health status detection circuit 206 of the communication control module 20. Generally, the rated control voltage of the motor is between 85% and 110%. When it is detected that the grid voltage cannot be satisfied, an alarm message will be sent to prevent the electric operating mechanism from working when the voltage is insufficient and unable to reliably close / open the circuit breaker. There are two ways to output the alarm message: 1. The health status indicator light on the panel; 2. Communicate and upload a report of the alarm fault to the control center. This alarm function is implemented by the health status detection circuit 206.

[0046] In the present utility model, an embodiment of a health status detection circuit is given. This circuit is composed of a rectifier circuit, a first voltage stabilizing circuit, a second voltage stabilizing circuit, a voltage sampling circuit, a comparator, a switching device, an indicating circuit, an abnormal alarm circuit, and other parts. Among them:

[0047] The rectifier circuit includes a half-bridge rectifier circuit composed of diodes D6 and D8, which rectifies the input alternating current VS1 / VS2 into a DC power supply. It has the characteristics of simple structure and low cost.

[0048] The first voltage stabilizing circuit consists of resistors R30, R39, R38, capacitor C15, and voltage stabilizing diode D4, etc. Capacitor C15 is a filtering capacitor. The first voltage stabilizing circuit takes power from the DC power supply, and outputs the power supply +5V after passing through resistors R30, R39, R38, and voltage stabilizing diode D4.

[0049] The second voltage stabilizing circuit consists of resistors R31, R32, capacitor C20, and voltage stabilizing diode D10. Capacitor C20 is a filtering capacitor. The second voltage stabilizing circuit takes power from power supply V+, and then outputs the reference voltage VREF.

[0050] The voltage sampling circuit consists of resistors R33, R34, capacitor C16, and voltage stabilizing diode D7, etc. Among them, capacitor C16 is a filtering capacitor. Resistors R33 and R34 form a voltage dividing circuit, and voltage stabilizing diode D7 plays an overvoltage protection role, limiting the maximum voltage value output by the voltage sampling circuit.

[0051] Comparator U8A is powered by power supply +5V. Its negative input terminal is connected to signal VREF, and its positive input terminal is connected to the output of the voltage sampling circuit. When the voltage sampling signal is higher than VREF, it outputs a high level; otherwise, it outputs a low level. In specific implementation, by designing the resistance value and voltage stabilizing value of the ratio resistors, when the input grid voltage is greater than 200V (i.e., 85% of the grid voltage), the reference voltage at the positive input of the comparator is greater than the reference voltage at the negative input of the comparator, and the comparator outputs a high level.

[0052] The abnormal alarm circuit includes resistor R35, triode Q6, relay K3, and protection diode D9. The switch state of relay K3 is normally closed. The abnormal alarm signal MO_Mal is sent by the processor 201, which can indicate abnormal alarms such as communication line disconnection and electric operation refusal to operate alarms.

[0053] The indication circuit includes resistor R36 and the health status indicator LED (i.e., the health status indicator 402). The indication circuit is connected to the output terminal of comparator U8A through the switch of relay K3. The health status indicator LED is controlled by both the output level of comparator U8A and relay K3, and is only lit when the output of comparator U8A is high level and relay K3 is conducting.

[0054] When the health status detection circuit 206 detects that the grid voltage is abnormal or receives an alarm signal sent by the processor unit 201, the health status detection circuit will drive the health status indicator light 402 to go out to indicate the current health status of the circuit breaker. In addition to indicating the grid voltage status, this health status indicator light also indicates whether the electrical operation is normal. When it is detected that the electrical operation does not act according to the control requirements, a refusal-to-operate alarm will be issued.

[0055] Specifically, when the alarm signal MO_Mal is at a low level, the relay is in a normally closed state, and the indication circuit reflects the grid voltage status; when the alarm signal MO_Mal is at a high level, the relay K3 changes from the normally closed state to the open state, and the LED indicator light LED loses power. At this time, if the output of the comparator U8A is at a high level, the LED indicator light LED lights up, indicating that the input voltage of the molded case circuit breaker is normal; otherwise, it indicates that the input voltage of the molded case circuit breaker cannot meet the minimum voltage requirement for the normal operation of the electrical operation.

[0056] In specific applications, the relay K3 can also be replaced with switching devices such as optocouplers, triodes, and MOS transistors. The drive control circuits of these switching devices can adopt conventional circuit designs and will not be elaborated in detail here.

[0057] The parameters of each device in the circuit can be selected according to functional requirements and are not limited here.

[0058] The input end of the circuit breaker status feedback circuit 205 includes multiple input interfaces, which are connected to the electrical operation manual / automatic feedback line, the lock feedback line, and the hub 50, and the output end is connected to the processor unit 201 to monitor the circuit breaker status, the electrical operation control module, and the lock status in real time. The circuit breaker status feedback circuit 205 adopts a conventional circuit design and will not be elaborated in detail here.

[0059] In summary, the molded case circuit breaker of the present invention has the following beneficial effects:

[0060] This molded case circuit breaker adopts internalized wiring. It connects the molded case circuit breaker and the electrical operation communication component through a hub, provides power for the electrical operation communication component to realize self-power supply for the electrical operation, and also provides the circuit breaker closing / opening status signal for the communication control module. The circuit breaker closing / opening status signal is taken from the auxiliary contact of the circuit breaker, connected to the hub through a wire, and then provided to the communication control module by the hub to judge the current status of the circuit breaker and realize automatic power-off after closing. It has the advantages of simple structure, self-power supply for the electrical operation, self-driving, and self-power-off.

[0061] Although the present invention has been specifically shown and described in combination with the preferred implementation embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all of them are within the protection scope of the present invention.

Claims

1. A molded case circuit breaker with a built-in communication module and an electric operation, characterized in that: It includes the main body of a molded case circuit breaker and an electric operation communication component arranged on its upper cover; The electric operation communication component includes an electric operation housing, and a communication control module and an electric operation drive module arranged in the electric operation housing; One hub, one communication port and one health status indicator are arranged on the electric operation housing; The hub is arranged on the side of the electric operation communication component facing the main body of the molded case circuit breaker, for taking power from the main body of the molded case circuit breaker and obtaining the closing and opening status of the molded case circuit breaker; In the assembled state, the hub is not accessible; The communication control module is connected to the electric operation drive module to execute electric operation closing and opening drive; is communicatively connected to an external device through the communication port; and drives the health status indicator.

2. The molded case circuit breaker according to claim 1, wherein: The communication control module includes a power supply circuit, a microprocessor, and a motor drive circuit, a circuit breaker status feedback circuit, a health status detection circuit and a communication circuit connected to the microprocessor; The power supply circuit takes power from the main body of the molded case circuit breaker through the hub and supplies power to the entire communication control module; The communication circuit is used for communicatively connecting to an external device; The health status detection circuit is used for detecting the grid voltage and driving the health status indicator to display the grid voltage status; The circuit breaker status feedback circuit is connected to the auxiliary contacts of the circuit breaker through the hub to monitor the status of the circuit breaker and the status of the electric operation drive module; The motor drive circuit is connected to the electric operation drive module and is used for driving the electric operation drive module to execute closing and opening actions.

3. The molded case circuit breaker according to claim 2, characterized in that: The communication circuit adopts an RS485 transceiver circuit.

4. The molded case circuit breaker according to claim 2, characterized in that: The motor drive circuit includes a first relay and a second relay. The first relay is a normally open type relay, including a normally open contact and a common terminal; the second relay is a changeover type relay, including a normally open contact, a normally closed contact and a common terminal connection; the common terminal of the first relay is connected to the normally closed contact of the second relay; the normally open contact and the common terminal of the first relay and the normally closed contact and the common terminal of the second relay are connected in series in the closing drive circuit, and the normally open contact and the common terminal of the second relay are connected in series in the opening drive circuit.

5. The molded case circuit breaker according to claim 2, characterized in that: The health status detection circuit includes: a rectifier circuit, a first voltage stabilizing circuit, a second voltage stabilizing circuit, a voltage sampling circuit, a comparator, a switching device and the health status indicator; The rectifier circuit is connected to an external power supply and is used for outputting a first power supply; The first voltage stabilizing circuit is used for taking power from the first power supply to generate a second power supply; The second voltage stabilizing circuit is connected across the first power supply and the ground and is used for generating a reference voltage signal; The voltage sampling circuit is connected across the first power supply and the ground and is used for outputting a voltage sampling signal of the first power supply; For the comparator, its positive input terminal inputs the voltage sampling signal, its negative input terminal inputs the reference voltage signal, and its output terminal is connected to the health status indicator through the main circuit of the switching device, and the other end of the health status indicator is grounded; The control circuit of the switching device is connected to an external control signal; the health status indicator is only lit when the main circuit of the switching device is turned on and the output of the comparator is at a high level.

6. The molded case circuit breaker according to claim 5, characterized in that: The rectifier circuit is a half-bridge rectifier circuit.

7. The molded case circuit breaker according to claim 5, characterized in that: The switching device is one of a relay, an optocoupler, a triode, and a MOS transistor.

8. The molded case circuit breaker according to claim 5, characterized in that: The main circuit of the switching device is set to a normally closed state.

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