Overload alarm non-tripping circuit breaker with adjustable current threshold

Abstract

The utility model relates to a circuit breaker, in particular to an overload alarm non-tripping circuit breaker with an adjustable current threshold, which comprises a man-machine interaction module and a circuit breaker module. The man-machine interaction module comprises a rotary encoder and an alarm lamp; the circuit breaker module comprises a current sensor, a current processing assembly, a data processor and a relay; the current sensor is arranged on the load side of the circuit breaker, the current processing assembly is electrically connected to the output end of the current sensor, the data processor is electrically connected to the output end of the current processing assembly, the relay is electrically connected to the output end of the data processor, and the alarm lamp is electrically connected to the output end of the relay. The rotary encoder is electrically connected to the input end of the data processor. Compared with the prior art, the overload alarm non-tripping circuit breaker solves the problem that an overload alarm non-tripping circuit breaker in the prior art can only carry out comparative judgment according to a set current threshold value and cannot be adjusted according to an actual application environment. According to the scheme, the current threshold value is adjusted under the condition that normal use of the circuit breaker is not affected.

Description

Technical Field

[0001] This utility model relates to a circuit breaker, specifically an overload alarm non-tripping circuit breaker with adjustable current threshold. Background Technology

[0002] The overload alarm function of circuit breakers without tripping is widely used in equipment that needs to operate continuously, such as hospitals and data centers. When an overload occurs, it only alarms and does not trip, which can avoid the serious consequences of sudden shutdown.

[0003] For example, CN210606050U discloses an overload alarm non-tripping device for an electronic molded case circuit breaker, including multiple current transformers, an electronic controller, and an overload alarm non-tripping module. The multiple current transformers are respectively connected to the multi-pole connection of the circuit breaker to collect current signals. The multiple current transformers are all connected to the electronic controller for transmitting current signals and providing power to the electronic controller. The electronic controller includes a current signal conditioning module, a current source power supply module, and a central processing unit. The multiple current transformers are connected to the current signal conditioning module and the current source power supply module. The current source power supply module is connected to the current signal conditioning module and the central processing unit. The central processing unit is connected to the current signal conditioning module and outputs a control signal after comparing with the overload alarm threshold to control the overload alarm non-tripping module to issue an alarm.

[0004] For example, CN106249095A discloses a leakage current alarm non-tripping control circuit for a miniature circuit breaker, which includes an input terminal L and an input terminal N. It also includes a power supply circuit, a residual current alarm signal freewheeling delay conversion circuit, a residual current alarm control circuit, and a residual current detection circuit. The residual current alarm signal freewheeling delay conversion circuit is provided with a residual current alarm signal output locking circuit. The residual current alarm signal freewheeling delay conversion circuit includes a tripping relay J1. The residual current alarm signal output locking circuit includes a relay J2. Pin 2 of switch J2-1 is connected to the input terminal L. Pin 1 of switch J2-1 is connected to the coil of relay J2. Pin 3 of switch J2-1 of relay J2 is connected to the power supply circuit. Pins 2 and 1 of switch J2-2 of relay J2 are closed as a signal output terminal.

[0005] However, the alarm current setting of current circuit breakers with overload alarm and non-tripping function is determined solely by the rated current of the circuit breaker, and this setting is not adjustable. When the design parameters of the equipment or current are adjusted, or the operating current of the circuit breaker changes, theoretically, the circuit breaker does not need to be replaced. However, to adjust the current threshold, a suitable miniature circuit breaker must be selected, which increases unnecessary costs. Therefore, there is a need for an overload alarm non-tripping circuit breaker with adjustable current. Utility Model Content

[0006] The purpose of this invention is to provide an overload alarm non-tripping circuit breaker with an adjustable current threshold to solve at least one of the aforementioned problems. This addresses the issue that existing overload alarm non-tripping circuit breakers can only compare and judge based on a set current threshold, and cannot be adjusted according to the actual application environment. This solution, by introducing a rotary encoder into the overload alarm non-tripping circuit breaker, enables adjustment of the current threshold according to the actual operating environment and line load conditions without affecting the normal operation of the circuit breaker.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] An overload alarm non-tripping circuit breaker with adjustable current threshold includes a human-machine interface module and a circuit breaker module.

[0009] The human-computer interaction module includes a rotary encoder and an alarm light;

[0010] The circuit breaker module includes a current sensor, a current processing component, a data processor, and a relay;

[0011] The current sensor is installed on the load side of the circuit breaker, the current processing component is electrically connected to the output terminal of the current sensor, the data processor is electrically connected to the output terminal of the current processing component, the relay is electrically connected to the output terminal of the data processor, and the alarm light is electrically connected to the output terminal of the relay.

[0012] The rotary encoder is electrically connected to the input terminal of the data processor.

[0013] Preferably, the current sensor is a current transformer used to collect current signals.

[0014] Preferably, the current processing component includes a full-wave rectifier unit and a DC-DC converter;

[0015] The full-wave rectifier unit is electrically connected to the output terminal of the current sensor and is used to convert AC power into pulsating DC power.

[0016] The DC-DC converter is electrically connected to the output of the full-wave rectifier unit to convert pulsating DC power into stable low-voltage DC power and supply power to the data processor.

[0017] Preferably, the full-wave rectifier unit is a full-wave rectifier circuit.

[0018] Preferably, the human-computer interaction module further includes a power indicator;

[0019] The power indicator is electrically connected to the output terminal of the DC-DC converter and is used to indicate the power supply status of the DC-DC converter. The DC-DC converter supplies power to the power indicator simultaneously when supplying power to the data processor, so the power indicator can indicate the power supply status of the DC-DC converter by whether it is lit or not.

[0020] Preferably, the data processor includes a first data receiving unit, a second data receiving unit, a data storage unit, a data processing unit, and a signal output unit;

[0021] The input terminal of the first data receiving unit is connected to the current processing component and is used to receive the current measurement signal processed by the current processing component as the current measurement value.

[0022] The input terminal of the second data receiving unit is connected to a rotary encoder and is used to receive the digital signal output by the rotary encoder as a current threshold.

[0023] The input terminals of the data storage unit are respectively connected to the first data receiving unit and the second data receiving unit, and are used to store the current measurement value obtained by the current sensor and the current threshold obtained by the rotary encoder.

[0024] The input terminal of the data processing unit is connected to the data storage unit and is used to compare the current measurement value with the current threshold and output instructions based on the comparison result.

[0025] The input terminal of the signal output unit is connected to the data processing unit and is used to output the instructions processed by the data processing unit.

[0026] Preferably, the data processing unit also integrates a timer for timing during the delayed output of instructions. This allows the system to avoid issuing alarms when a very brief overload occurs on the line that does not affect the normal operation of the circuit breaker, thus reducing the waste of manpower costs. The delay length is set according to the actual application.

[0027] Preferably, the rotary encoder has at least four contacts.

[0028] Preferably, the circuit breaker module further includes an electronic switch;

[0029] The electronic switch is electrically connected between the data processor and the relay and is used to control the on / off state of the relay.

[0030] Preferably, the electronic switch is a MOS field-effect transistor.

[0031] Preferably, the human-computer interaction module further includes an alarm output interface;

[0032] The alarm output interface is electrically connected to the output terminal of the relay and is used to connect multiple external alarm devices to expand its connectable objects.

[0033] The working principle of this utility model is as follows:

[0034] The rotary encoder sends digital signals to the data processor. The data processor determines the current threshold based on the preset correspondence between the digital signal output value of the rotary encoder and the current threshold, and makes a comparison and judgment based on the determined current threshold.

[0035] By adjusting the rotary encoder, the digital signal it outputs to the data processor can be changed. The data processor can then adjust the set current threshold according to a preset correspondence, thereby enabling the current threshold of the overload alarm non-tripping circuit breaker to be adjustable.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This solution designs an overload alarm non-tripping circuit breaker with an adjustable current threshold. Based on the equipment or circuit design parameters and considering environmental factors such as temperature and humidity, the circuit breaker can directly adjust the current threshold via a rotary encoder on the human-machine interface module when the rated current, maximum allowable current, and load operating current requirements change. This ensures the circuit breaker meets normal operating requirements while providing an adjustable overload current threshold and a precise alarm mechanism. Furthermore, the adjustment method adopted by this circuit breaker is intuitive, quick, convenient, and easy to use.

[0038] The circuit breaker in this solution can also be configured with a delayed alarm function as needed, so that no alarm is triggered when a very short-term overload occurs that does not affect the normal use of the circuit breaker, effectively avoiding the waste of manpower costs.

[0039] The circuit breaker in this solution has an additional alarm output interface, which increases the number of alarm output contacts. As a result, the circuit breaker can be further connected to other alarm devices, thus having good scalability. Attached Figure Description

[0040] Figure 1 A schematic diagram of a non-tripping circuit breaker with an adjustable current threshold and overload alarm.

[0041] In the picture:

[0042] 100 - Human-computer interaction module; 200 - Circuit breaker module;

[0043] 11-Power indicator; 12-Rotary encoder; 13-Alarm indicator; 14-Alarm output interface;

[0044] 21-Current sensor; 22-Full-wave rectifier unit; 23-DC-DC converter; 24-Data processor; 25-Electronic switch; 26-Relay. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0046] Unless otherwise specified, all components used in the following description are commercially available products that meet the functional requirements, and all circuits involved can use existing technologies to achieve the corresponding functional effects.

[0047] Example

[0048] An overload alarm non-tripping circuit breaker with adjustable current threshold, such as... Figure 1 As shown, it includes a human-computer interaction module 100 and a circuit breaker module 200;

[0049] The human-computer interaction module 100 includes a rotary encoder 12 and an alarm light 13;

[0050] The circuit breaker module 200 includes a current sensor 21, a current processing component, a data processor 24, and a relay 26;

[0051] The current sensor 21 is disposed on the load side of the circuit breaker, the current processing component is electrically connected to the output terminal of the current sensor 21, the data processor 24 is electrically connected to the output terminal of the current processing component, the relay 26 is electrically connected to the output terminal of the data processor 24, and the alarm light 13 is electrically connected to the output terminal of the relay 26.

[0052] The rotary encoder 12 is electrically connected to the input terminal of the data processor 24.

[0053] More specifically, in this embodiment:

[0054] like Figure 1 As shown, the overload alarm non-tripping circuit breaker with adjustable current threshold consists of two parts: a human-machine interface module 100 and a circuit breaker module 200. The human-machine interface module 100 provides users with a simple operation method and intuitive signal feedback. The circuit breaker module 200 controls the alarm of the circuit breaker based on the input in the human-machine interface module 100. The human-machine interface module 100 further includes a power indicator 11, a rotary encoder 12, an alarm indicator 13, and an alarm output interface 14. The circuit breaker module 200 includes a current sensor 21, a full-wave rectifier unit 22, a DC-DC converter 23, a data processor 24, an electronic switch 25, and a relay 26.

[0055] The current sensor 21, which is a current transformer, is located on the load side of the circuit breaker and connected to the circuit in which the circuit breaker is located, and is used to collect current signals.

[0056] The full-wave rectifier unit 22 adopts a full-wave rectifier circuit and is connected to the output terminal of the current sensor 21. It rectifies the current signal collected by the current sensor 21 and converts the AC power into pulsating DC power. The output terminal of the full-wave rectifier unit 22 is connected to the DC-DC converter 23 and the data processor 24 respectively.

[0057] DC-DC converter 23 regulates the output voltage by turning on and off a transistor, thereby converting a large input DC high voltage into a stable DC low voltage and a pulsating input DC into a stable low-voltage DC output to power its downstream power supply lamp 11, data processor 24 and electronic switch 25.

[0058] The data processor 24 may specifically include a first data receiving unit, a second data receiving unit, a data storage unit, a data processing unit, a signal output unit, and a power supply unit. The first data receiving unit is connected to the output of the full-wave rectifier unit 22 to acquire the rectified current signal as a current measurement value for comparison. The second data receiving unit is connected to the output of the rotary encoder 12 to acquire the digital signal output of the rotary encoder 12 and determine the current threshold for comparison based on a pre-set correspondence between the rotary encoder 12 output value and the current threshold (the data processing unit determines the correspondence). The data storage unit stores the current measurement value acquired by the first data receiving unit and the digital signal acquired by the second data receiving unit for later retrieval. The data processing unit retrieves the current measurement value and the current threshold stored in the data storage unit and compares them. Based on the comparison result, the data processing unit outputs an alarm command. The signal output unit outputs the command from the data processing unit to the electronic switch 25 to control the opening and closing of the electronic switch 25, thereby controlling the alarm. The power supply unit provides power to the remaining units in the data processor 24. The data processor 24 may further include a timer, which can be used to implement a delayed alarm in conjunction with a preset delay duration.

[0059] An electronic switch 25 is connected to the output terminal of the data processor 24 and is controlled to turn on and off according to the instructions of the data processor 24. The electronic switch 25 uses a MOSFET, and the on / off control and the output drain current control are achieved by adjusting the voltage applied to the gate of its input terminal according to the instructions of the data processor 24.

[0060] Relay 26 is connected to the output terminal of electronic switch 25, and is energized by electronic switch 25.

[0061] The power indicator 11 is connected to the output terminal of the DC-DC converter 23, is powered by the DC-DC converter 23, and indicates the power supply status of the DC-DC converter 23.

[0062] The rotary encoder 12, with its output connected to the data processor 24, primarily relies on its internal photoelectric or magnetoelectric sensors to capture the displacement data of the rotating disk and convert it into digital signals for output. The rotary encoder 12 has multiple adjustable contacts, allowing its internal probes to form different arrangements and combinations when the knob is rotated, generating different pulse signals and forming different data codes transmitted to the data processor 24. This provides various adjustable currents to cover all rated current requirements of the circuit breaker frame class. In this embodiment, a 6-contact rotary encoder 12 is preferably used, providing 15 adjustable currents to meet the requirements of the miniature circuit breaker frame class. The digital signals output by the rotary encoder 12 after adjustment correspond to a preset current threshold; therefore, by adjusting the rotary encoder 12, the digital signals it outputs to the data processor 24 can be changed. The data processor 24 can determine the current threshold for that state based on the received digital signals.

[0063] Alarm light 13 is connected to the output terminal of relay 26 and is powered by relay 26; it emits a light alarm after relay 26 is energized.

[0064] The alarm output interface 14 is connected to the output terminal of the relay 26 and can be connected to external alarm devices to further expand the alarm form and alarm range and scale of the overload alarm non-tripping circuit breaker.

[0065] In this embodiment, the data processor 24 may be an integrated PFM controller such as the PN8015; the rotary encoder 12 may be a 6-pin 8421 rotary encoder switch, which can provide 15 adjustable currents, fully covering the rated current of a single frame of a miniature circuit breaker.

[0066] When the circuit breaker is in operation, the current transformer collects the current signal and transmits the circuit breaker current signal to the full-wave rectifier unit 22 for rectification processing, and then transmits it to the data processor 24; at the same time, the full-wave rectifier unit 22 converts the AC power into pulsating DC power, and the DC-DC converter 23 uses the switching on and off of the transistor to adjust the output voltage, thereby converting the large input DC high voltage into stable DC low voltage power, and converting the input pulsating DC power into stable low voltage DC power output to power the power lamp 11, the data processor 24 and the electronic switch 25.

[0067] The data processor 24 determines the current threshold based on the digital signal output by the rotary encoder 12. Specifically, this current threshold is divided into three levels: In, In1, and In2, according to the delay alarm setting. When the measured current value is lower than In, it indicates that the circuit is not overloaded, and the circuit breaker does not operate. When the measured current value is between In and In1, it indicates that the overload is small, and there is a possibility of a very short-term overload that does not require handling; an alarm is triggered after a 5-second delay. When the measured current value is between In1 and In2, it indicates that there is a certain overload, and an alarm is triggered after a 2-second delay. When the measured current value is higher than In2, it indicates that the circuit load is severely overloaded, and an alarm is triggered after a 0.5-second delay. In, In1, and In2 can be set according to actual needs, and the delay duration can also be adjusted.

[0068] The signal (current measurement value) sampled by the current transformer and rectified by full-wave rectification is transmitted to the output processor and compared with the current threshold determined by the data processor 24. When the sampled signal is less than In, the data processor 24 does not issue an output control signal; when the sampled signal is in the range of In to In1, the data processor 24 outputs a control signal after a 5-second delay using an internal delay counter; when the sampled signal is in the range of In1 to In2, the data processor 24 outputs a control signal after a 2-second delay using an internal delay counter; when the sampled signal is greater than In2, the data processor 24 outputs a control signal after a 0.5-second delay using an internal delay counter. When the MOSFET acting as the electronic switch 25 receives the signal output from the data processor 24, the voltage applied to the gate of the MOSFET controls the drain current at the output terminal, quickly and accurately controlling the coil of the relay 26, energizing the relay 26. The alarm light 13 and alarm output interface 14 controlled by the relay 26 also simultaneously issue a warning.

[0069] This solution's overload alarm non-tripping circuit breaker, through the setting of the multi-contact rotary encoder 12, can cover all rated currents under the miniature circuit breaker frame class. Without affecting the normal use of the circuit breaker, the alarm current threshold can be changed by adjusting the dial according to the actual operating environment and line load conditions. At the same time, the expandable alarm methods ensure the reliability of alarm notification, and the delayed alarm function can provide alarm notification in a more user-friendly way.

[0070] This overload alarm non-tripping circuit breaker adds a delayed alarm function under different overload currents. Under different rated preset currents, it has three delay alarm times of 5s, 2s and 0.5s respectively, to reduce unnecessary human intervention. At the same time, an alarm output interface 14 is added. The overload alarm function can not only be indicated by the alarm light 13 of the human-machine interaction module 100, but also by external sound devices such as buzzers connected through the added alarm output interface 14, so that when the circuit breaker current is abnormally triggered, notification and warning are given from multiple aspects such as sound and light.

[0071] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. An overload alarm trip circuit breaker with adjustable current threshold, characterized in that, The utility model relates to a circuit breaker module (200) and a human-computer interaction module (100) are connected, and the human-computer interaction module (100) and the circuit breaker module (200) are connected through the electronic switch (25). The human-computer interaction module (100) comprises a rotary encoder (12) and an alarm lamp (13). The circuit breaker module (200) comprises a current sensor (21), a current processing assembly, a data processor (24) and a relay (26). The current sensor (21) is arranged on the load side of the circuit breaker, the current processing assembly is electrically connected to the output end of the current sensor (21), the data processor (24) is electrically connected to the output end of the current processing assembly, the relay (26) is electrically connected to the output end of the data processor (24), and the alarm lamp (13) is electrically connected to the output end of the relay (26). The rotary encoder (12) is electrically connected to the input end of the data processor (24).

2. The overload alarm trip circuit breaker with adjustable current threshold according to claim 1, characterized in that, The current sensor (21) is a current transformer for collecting current signals.

3. The overload alarm trip circuit breaker with adjustable current threshold according to claim 1, characterized in that, The current processing assembly comprises a full-wave rectification unit (22) and a DC-DC converter (23). The full-wave rectification unit (22) is electrically connected to the output end of the current sensor (21) and is used to convert alternating current into pulsating direct current. The DC-DC converter (23) is electrically connected to the output end of the full-wave rectification unit (22) and is used to convert the pulsating direct current into stable low-voltage direct current and supply power to the data processor (24).

4. The overload alarm trip circuit breaker with adjustable current threshold according to claim 3, characterized in that, The human-computer interaction module (100) further comprises a power supply lamp (11). The power supply lamp (11) is electrically connected to the output end of the DC-DC converter (23) and is used to indicate the power supply state of the DC-DC converter (23).

5. The overload alarm trip circuit breaker with adjustable current threshold according to claim 1, characterized in that, The data processor (24) comprises a first data receiving unit, a second data receiving unit, a data storage unit, a data processing unit and a signal output unit. The input end of the first data receiving unit is connected to the current processing assembly and is used to receive the current measurement signal processed by the current processing assembly as a current measurement value. The input end of the second data receiving unit is connected to the rotary encoder (12) and is used to receive the digital signal output by the rotary encoder (12) as a current threshold value. The input ends of the data storage unit are respectively connected to the first data receiving unit and the second data receiving unit and are used to store the current measurement value obtained by the current sensor (21) and the current threshold value obtained by the rotary encoder (12). The input end of the data processing unit is connected to the data storage unit and is used to compare the size of the current measurement value and the current threshold value and output an instruction according to the comparison result. The input end of the signal output unit is connected to the data processing unit and is used to output the instruction processed by the data processing unit.

6. A current threshold adjustable overload alarm trip circuit breaker according to claim 5, wherein, The data processing unit is further integrated with a timer for timing during the process of delaying the output of the instruction.

7. The overload alarm trip circuit breaker of claim 1 wherein, The rotary encoder (12) has at least four contacts.

8. The overload alarm trip circuit breaker of claim 1 wherein, The circuit breaker module (200) further comprises an electronic switch (25). The electronic switch (25) is electrically connected between the data processor (24) and the relay (26) and is used to control the on-off of the relay (26).

9. A current threshold adjustable overload alarm trip circuit breaker according to claim 8, wherein, The electronic switch (25) is a MOS field effect transistor.

10. The overload alarm trip circuit breaker of claim 1 wherein, The human-computer interaction module (100) further comprises an alarm output interface (14). The alarm output interface (14) is electrically connected to the output end of the relay (26) and is used for connecting external alarm equipment.

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