Molded case circuit breaker

Abstract

This utility model discloses a molded case circuit breaker, including a housing and a control handle disposed on the housing panel. The housing houses a main control module, a local program upgrade module, and a remote program upgrade module. The local program upgrade module includes a Type-C interface, a voltage regulator circuit, and a first isolation circuit. The Type-C interface is located on the housing panel. The power supply terminal of the Type-C interface is connected to the power supply terminal of the main control module through the voltage regulator circuit, and the data terminal of the Type-C interface is connected to the communication terminal of the main control module through the first isolation circuit. This utility model achieves plug-and-play local offline program upgrades through the Type-C interface. Combined with the remote program upgrade module, the circuit breaker can achieve more convenient and diverse program upgrades, and the program upgrade structure has stronger anti-interference capabilities, with stable and efficient data transmission.

Description

Technical Field

[0001] This utility model relates to a molded case circuit breaker, and more particularly to its program upgrade module and voltage information acquisition module. Background Technology

[0002] The utility model disclosure CN207441619U discloses a molded case circuit breaker controller, including a central processing unit (CPU), a current sampling circuit, a signal amplification circuit, an ADC conversion circuit, a BJ signal input module, an HZ signal output module, an FZ signal output module, a TTL conversion circuit, an RS485 communication circuit, a power amplification circuit, a tripping output circuit, a working state circuit, a power supply circuit, peripheral circuits of the CPU, and a function setting module. The current sampling circuit is connected to the input terminal of the ADC conversion circuit via the signal amplification circuit, and the output terminal of the ADC conversion circuit is connected to the current signal input terminal of the CPU. Although an electronic control module is provided and a program is set, program upgrades cannot be achieved through data input, which is not conducive to localized adjustments or adaptive program upgrades to keep pace with technological advancements. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a molded case circuit breaker that can realize local offline and remote prior program upgrades, has stronger electrical safety and anti-interference capabilities, and stable and efficient data transmission.

[0004] To achieve the above objectives, this utility model provides a molded case circuit breaker, including a housing and a control handle disposed on the housing panel. The housing houses a main control module, a local program upgrade module, and a remote program upgrade module. The local program upgrade module includes a Type-C interface, a voltage regulator circuit, and a first isolation circuit. The Type-C interface is disposed on the housing panel; the power supply terminal of the Type-C interface is connected to the power supply terminal of the main control module through the voltage regulator circuit, and the data terminal of the Type-C interface is connected to the communication terminal of the main control module through the first isolation circuit. The remote program upgrade module includes an RS-485 communication circuit, a surge protection filter circuit, and a second isolation circuit; the RS-485 communication circuit is connected to the main control module through the second isolation circuit, and the surge protection filter circuit is located at the signal input terminal of the RS-485 communication circuit; the main control module is configured to receive upgrade data through the local program upgrade module or the remote program upgrade module, and update its own firmware.

[0005] Preferably, the first isolation circuit includes an isolation optocoupler, the input of which is connected to the data transmitting and receiving ends of the Type-C interface, and the output of which is connected to the serial port pin of the main control module, for realizing electrical isolation between the host computer and the main control module.

[0006] Preferably, the surge protection filter circuit includes a TVS diode and an RC filter network; the RS-485 communication circuit includes an RS-485 transceiver chip, which is connected to the main control module through a high-speed optocoupler in the second isolation circuit, and is used to convert the differential signal into a TTL level signal for transmission to the main control module.

[0007] Preferably, the housing also includes a voltage sampling circuit. The input terminal of the voltage sampling circuit is used to connect to the three-phase AC input voltage, and the output terminal is connected to the analog-to-digital converter (ADC) pin of the main control module. The voltage sampling circuit includes a rectification unit, a voltage divider sampling unit, and a signal conditioning unit. After the three-phase AC input voltage is rectified by the rectification unit, it is attenuated by the voltage divider sampling unit, and then filtered and amplified by the signal conditioning unit before being input to the main control module.

[0008] Preferably, the signal conditioning unit includes an operational amplifier and an RC low-pass filter network; the operational amplifier is configured as a non-inverting amplifier circuit, used to adjust the voltage signal after voltage division to the sampling range of the ADC of the main control module; the RC low-pass filter network is used to filter out high-frequency harmonic interference.

[0009] Preferably, the ADC pins of the main control module include a first ADC pin, a second ADC pin, and a third ADC pin, which are respectively connected to the sampling signal paths of the three-phase AC input voltage. The main control module is configured to collect the voltage values ​​of each phase and calculate the effective voltage value to determine overvoltage, undervoltage, or phase loss faults.

[0010] Preferably, the housing panel is further provided with a human-machine interaction module, which includes a running status indicator, a communication status indicator, and a fault indicator; each of the indicator lights is connected to the general-purpose input / output (IO) pin of the main control module through a current-limiting resistor.

[0011] Preferably, the housing panel has a functional area slot, and the Type-C interface, the running status indicator, the communication status indicator and the fault indicator are all located in the functional area slot; a flip cover for covering the functional area slot is hinged to the functional area slot.

[0012] This utility model has the following significant advantages over the prior art: 1. Significantly improves electrical safety and anti-interference capability: The patented technical solution is equipped with a first isolation circuit (isolation optocoupler) and a second isolation circuit (high-speed optocoupler). Through the optocoupler isolation design, a reliable electrical isolation barrier is established between the local Type-C upgrade interface and the remote RS-485 communication interface and the main control module. This effectively blocks interference signals such as static electricity and surges from the host computer or external communication bus from entering the high-voltage control circuit inside the circuit breaker, avoiding MCU crashes or malfunctions caused by communication interference, and greatly improving the operational stability and safety of the equipment in complex industrial environments.

[0013] 2. Achieving Efficient and Flexible Firmware Iteration and Maintenance: The collaborative configuration of the "local program upgrade module" and the "remote program upgrade module" in this patent breaks through the limitations of traditional molded case circuit breaker firmware upgrades. On the one hand, field maintenance personnel can quickly perform local offline upgrades via the Type-C interface on the panel without disassembling the device; on the other hand, remote online upgrades are supported via the RS-485 bus. This dual-channel upgrade architecture enables the device to flexibly adapt to different maintenance scenarios, significantly reducing the later maintenance costs and downtime of the device.

[0014] 3. Enhanced robustness of communication links and equipment lifespan: The RS-485 communication interface in this patent is equipped with a TVS and RC filter network at the front end, which can effectively absorb and discharge transient high-voltage energy such as lightning surges and power fluctuations commonly seen in industrial environments, and filter out high-frequency noise. This not only prevents the communication chip from being damaged by breakdown, but also ensures the data integrity of long-distance bus communication, significantly extending the service life of the equipment under harsh operating conditions.

[0015] 4. Achieving High-Precision Power Grid Status Monitoring and Fault Early Warning: This patent incorporates a voltage sampling circuit (rectification, voltage division, signal conditioning, and RC low-pass filtering). Through precise voltage division sampling and in-phase proportional amplification circuits, high-voltage AC power is accurately converted into a safe low-voltage signal recognizable by the MCU. Combined with an RC low-pass filter network, high-frequency harmonic interference in the power grid is effectively filtered out. This enables the main control module to acquire the effective values ​​of the three-phase voltage with high precision, thereby achieving rapid and accurate judgment of power grid faults such as overvoltage, undervoltage, and phase loss, improving the intelligent protection level of the circuit breaker.

[0016] 5. Optimized Human-Machine Interaction and Interface Protection: This patent utilizes three independent indicator lights for operation, communication, and fault, enabling intuitive visualization of the device status and facilitating quick troubleshooting by on-site personnel. Simultaneously, the Type-C interface and indicator lights are centrally located within a functional area slot, and combined with a hinged flip-top design, effectively preventing the intrusion of dust, moisture, and other foreign objects when not in use. This solves the problem of exposed interfaces being susceptible to contamination and damage, improving the overall protection level of the product and the user experience. Attached Figure Description

[0017] The present invention includes the following figures: Figure 1 This is a schematic diagram of the structure of the molded case circuit breaker provided by this utility model.

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of a molded case circuit breaker after the cover has been removed.

[0019] Figure 3 The circuit diagram of the molded case circuit breaker provided by this utility model. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] Reference Figure 1-3 As shown, this utility model provides a molded case circuit breaker, including a housing 1 and a control handle 2 disposed on the panel of the housing 1. The housing 1 houses a main control module, a local program upgrade module, and a remote program upgrade module. The local program upgrade module includes a Type-C interface 3, a voltage regulator circuit, and a first isolation circuit. The Type-C interface 3 is disposed on the panel of the housing. The power supply terminal of the Type-C interface 3 is connected to the power supply terminal of the main control module through the voltage regulator circuit. The data terminal of the Type-C interface 3 is connected to the communication terminal of the main control module through the first isolation circuit. The first isolation circuit includes an isolation optocoupler. The input terminal of the isolation optocoupler is connected to the data transmitting and receiving terminals of the Type-C interface 3, and the output terminal of the isolation optocoupler is connected to the serial port pin of the main control module, for achieving electrical isolation between the host computer and the main control module. The remote program upgrade module includes an RS-485 communication circuit, a surge protection filter circuit, and a second isolation circuit; the RS-485 communication circuit is connected to the main control module through the second isolation circuit, and the surge protection filter circuit is located at the signal input terminal of the RS-485 communication circuit; the main control module is configured to receive upgrade data through the local program upgrade module or the remote program upgrade module, and update its own firmware.

[0022] The local program upgrade module and the remote program upgrade module mentioned above, and their working methods are as follows: The local program upgrade module, also known as the Type-C program upgrade module (USB-Type-C circuit area).

[0023] Work style: 1. The Type-C port connects to the host computer's USB 5V power supply, which is then regulated by the HT7039 to output a stable 3.3V to the MCU unit. 2. The Type-C D+ / D- signals are electrically isolated through the isolation optocoupler OP1, which transmits the host computer serial port upgrade data to the STM32F103CBT6 microcontroller and connects to the microcontroller's ICE_CLK and ICE_DAT download pins. 3. Isolate the host computer from the field power ground using an optical coupler to avoid communication interference; Fourth, the host computer directly programs the MCU Flash via a serial port download protocol, enabling local offline upgrades.

[0024] The remote program upgrade module, also known as the 485 communication remote program upgrade module, includes three sets of optocoupler isolation (OP3 / OP4 / OP5), three AT3H7B-Cu-S 485 transceiver chips, VP3082, RS485TXD / RXD, and RFRX / RFTX pull-up / pull-down resistors on the entire circuit.

[0025] Work style: 1. The remote control room sends upgrade data packets via a twisted-pair 485 bus; 2. The bus signal is protected against surges by TVS and RC filtering, and then strong and weak current isolation is achieved by high-speed optocouplers OP3 / OP4 / OP5 to isolate the 380V strong current interference on site; III. The AT3H7B 485 chip completes differential 485 level control. The MCU uses a single-ended TTL level converter to send remote upgrade commands and firmware packages to the MCU's serial port. IV. After receiving the complete firmware, the MCU verifies the CRC. If the verification is successful, the original program is erased and the new firmware is written, enabling remote online upgrades without disassembling the device.

[0026] The main control module has three ADC pins: a first ADC pin, a second ADC pin, and a third ADC pin, which are respectively connected to the sampling signal paths of the three-phase AC input voltage. The main control module is configured to collect the voltage values ​​of each phase and calculate the effective voltage value to determine overvoltage, undervoltage, or phase loss faults.

[0027] Reference Figure 2-3 As shown, the surge protection filter circuit includes a TVS diode and an RC filter network; the RS-485 communication circuit includes an RS-485 transceiver chip, which is connected to the main control module through a high-speed optocoupler in the second isolation circuit, and is used to convert the differential signal into a TTL level signal for transmission to the main control module.

[0028] Reference Figure 2-3 As shown, a voltage sampling circuit is also provided inside the housing. The input terminal of the voltage sampling circuit is used to receive the three-phase AC input voltage, and the output terminal is connected to the analog-to-digital converter (ADC) pin of the main control module. The voltage sampling circuit includes a rectification unit, a voltage divider sampling unit, and a signal conditioning unit. After the three-phase AC input voltage is rectified by the rectification unit, it is attenuated by the voltage divider sampling unit, and then filtered and amplified by the signal conditioning unit before being input to the main control module. The signal conditioning unit includes an operational amplifier and an RC low-pass filter network. The operational amplifier is configured as a non-inverting proportional amplifier circuit to adjust the voltage signal after voltage division to the sampling range of the ADC of the main control module. The RC low-pass filter network is used to filter out high-frequency harmonic interference.

[0029] The voltage sampling circuit described above uses IA_IN / IB_IN / IC_IN three-phase inputs, HD06 three-phase rectifier bridge, RWI sampling resistor, U1A / U1B / U2C operational amplifiers, RA / RC filter network, and IA_ADC / IB_ADC / IC_ADC connected to the MCU PA0 / PA1 / PA2 ADC pins.

[0030] Work style: 1. The three-phase AC voltages IA_IN, IB_IN, and IC_IN are converted into unidirectional pulsating DC by the HD06 single-phase rectifier bridge. 2. The RW1 precision resistor is used for voltage division sampling to attenuate the high-voltage AC signal to a low-voltage range that the op-amp can handle; 3. U1A / U1B / U2C form a non-inverting proportional amplifier circuit. The RA resistor configures the amplification factor and matches the 0~3.3V ADC sampling range of the MCU. The CA1 / CA2 / CA22 capacitors form an RC low-pass filter to filter out high-frequency harmonic interference from the power grid. IV. The amplified and filtered DC sampling voltage is fed into the built-in 12-bit ADC of HC32L130 PA0 / PA1 / PA2; 5. The MCU periodically acquires ADC values, and the software converts and restores the three-phase real-time AC voltage, calculates the effective voltage value, and judges overvoltage / undervoltage and phase loss faults.

[0031] Reference Figure 1-3As shown, a human-machine interface module is also provided on the housing panel. The human-machine interface module includes a running status indicator, a communication status indicator, and a fault indicator. Each of the indicator lights is connected to the general-purpose input / output (IO) pin of the main control module through a current-limiting resistor. A functional area slot 4 is provided on the housing panel, and the Type-C interface 3, as well as the running status indicator, communication status indicator, and fault indicator, are all located in the functional area slot 4. A flip cover 5 is hinged to the functional area slot 4 to cover it.

[0032] The aforementioned human-machine interaction module includes LED1 (work running light), LED2 (act communication transceiver light), LED3 (err fault light), and is equipped with RL5 / RL6 current limiting resistors, IO driver PB13 / PB14 / PB15, and pull-up resistor RP7 as part of the complete circuit.

[0033] Work style: The negative terminal of the LED is connected to 3.3V, and the positive terminal is connected to the MCU PB13 / PB14 / PB15 IO port via a current-limiting resistor RL. When the MCU IO output is low, the corresponding LED forms a current loop and lights up; when the IO output is high, it turns off.

[0034] LED1 Work: Controlled by PB13, a solid LED on when the system is powered on indicates that the main controller is operating normally; LED2 act: Controlled by PB14, it flashes rapidly when transmitting and receiving data on the 485 bus; LED3 err: Controlled by PB15, stays on when there is a communication error or equipment failure.

[0035] Synchronize the switch status between the main control room and the field: I. Communication Link Status: ACT LED flashing = Normal 485 bus data interaction; constantly off = Bus disconnection, short circuit, no slave response; II. Equipment Operating Status: Work indicator light is always on = the field switch motherboard is powered and the MCU is working normally; off = the equipment is powered off / the hardware is frozen; III. Fault Alarm Status: err constantly lit = communication timeout, voltage acquisition abnormality, switch opening / closing fault; off = equipment has no fault; IV. Real-time synchronization of opening and closing: The 485 transmits the current open / closed position of the switch to the main control room. The ACTI light flashes along with the message, and the main control interface updates the switch position synchronously. The indicator light intuitively assists maintenance personnel in quickly locating communication disconnection, equipment crash, and on-site faults.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. The above preferred embodiments of the present utility model are not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of the present utility model. Any simple modifications, equivalent changes and alterations made by the technical essence of the present utility model to the above embodiments shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A molded case circuit breaker, comprising a housing and a control handle disposed on the panel of the housing, characterized in that, The housing contains a main control module, a local program upgrade module, and a remote program upgrade module. The local program upgrade module includes a Type-C interface, a voltage regulator circuit, and a first isolation circuit. The Type-C interface is located on the housing panel. The power supply terminal of the Type-C interface is connected to the power supply terminal of the main control module through the voltage regulator circuit, and the data terminal of the Type-C interface is connected to the communication terminal of the main control module through the first isolation circuit. The remote program upgrade module includes an RS-485 communication circuit, a surge protection filter circuit, and a second isolation circuit; the RS-485 communication circuit is connected to the main control module through the second isolation circuit, and the surge protection filter circuit is located at the signal input terminal of the RS-485 communication circuit; the main control module is configured to receive upgrade data through the local program upgrade module or the remote program upgrade module, and update its own firmware.

2. A molded case circuit breaker according to claim 1, characterized in that, The first isolation circuit includes an isolation optocoupler. The input terminal of the isolation optocoupler is connected to the data transmitting and receiving terminals of the Type-C interface, and the output terminal of the isolation optocoupler is connected to the serial port pin of the main control module, so as to realize electrical isolation between the host computer and the main control module.

3. A molded case circuit breaker according to claim 1, characterized in that, The surge protection filter circuit includes a TVS diode and an RC filter network; the RS-485 communication circuit includes an RS-485 transceiver chip, which is connected to the main control module through a high-speed optocoupler in the second isolation circuit, and is used to convert the differential signal into a TTL level signal for transmission to the main control module.

4. A molded case circuit breaker according to claim 1, 2, or 3, characterized in that, The housing also includes a voltage sampling circuit. The input terminal of the voltage sampling circuit is used to receive the three-phase AC input voltage, and the output terminal is connected to the analog-to-digital converter (ADC) pin of the main control module. The voltage sampling circuit includes a rectification unit, a voltage divider sampling unit, and a signal conditioning unit. After the three-phase AC input voltage is rectified by the rectification unit, it is attenuated by the voltage divider sampling unit, and then filtered and amplified by the signal conditioning unit before being input to the main control module.

5. A molded case circuit breaker according to claim 4, characterized in that, The signal conditioning unit includes an operational amplifier and an RC low-pass filter network; the operational amplifier is configured as a non-inverting amplifier circuit, used to adjust the voltage signal after voltage division to the sampling range of the ADC of the main control module; the RC low-pass filter network is used to filter out high-frequency harmonic interference.

6. A molded case circuit breaker according to claim 4, characterized in that, The main control module has three ADC pins: a first ADC pin, a second ADC pin, and a third ADC pin, which are respectively connected to the sampling signal paths of the three-phase AC input voltage. The main control module is configured to collect the voltage values ​​of each phase and calculate the effective voltage value to determine overvoltage, undervoltage, or phase loss faults.

7. A molded case circuit breaker according to claim 1, 2, or 3, characterized in that, The housing panel is also provided with a human-machine interaction module, which includes a running status indicator, a communication status indicator, and a fault indicator; each of the indicator lights is connected to the general-purpose input / output (IO) pin of the main control module through a current-limiting resistor.

8. A molded case circuit breaker according to claim 7, characterized in that, The housing panel has a functional area slot, and the Type-C interface, as well as the running status indicator, communication status indicator and fault indicator, are all located in the functional area slot; a flip cover for covering the functional area slot is hinged to the functional area slot.

Images