CN219322065U - Residual current circuit breaker - Google Patents

Abstract

The application discloses a residual current circuit breaker, which comprises a step-down module, a single-phase metering conversion module and a control module; the voltage reduction module is used for respectively carrying out voltage reduction treatment on the input three-phase voltage signals to obtain three-phase low-voltage signals corresponding to the three-phase voltage signals and common signals of the three-phase low-voltage signals, and outputting the three-phase low-voltage signals and the common signals to the single-phase metering conversion module respectively; the single-phase metering conversion module is used for obtaining a digital voltage signal according to the three-phase low-voltage signal and the common signal and outputting the digital voltage signal to the control module; the control module is used for carrying out data processing on the digital voltage signals to obtain sampling voltage data. The residual current circuit breaker realizes voltage sampling through the single-phase metering conversion module, so that the measurement cost can be reduced, the measurement accuracy can be ensured, and the application range and the reliability of the residual current circuit breaker are greatly improved.

Description

Residual current circuit breaker

Technical Field

The application relates to the technical field of electronic circuits, in particular to a residual current circuit breaker.

Background

Currently, the residual current operated circuit breaker is widely applied to circuit networks of direct contact electric shock protection and indirect contact electric shock protection, and can automatically break a circuit when a human body touches a charged body or equipment is damaged in insulation to form a grounding fault, thereby playing a role in protection.

In the use process of the residual current operated circuit breaker, the voltage state of the current power grid can be observed by means of external devices such as a measuring instrument, a power indicator lamp and the like, but the existing cabinet body for installing the residual current operated circuit breaker is small in size and limited in installation position, and more components can not be accommodated, so that the residual current operated circuit breaker with a voltage measurement display function is generated.

The residual current operated circuit breaker with the three-phase voltage measurement display function in the related art is used for sampling voltage in two modes, namely, sampling by utilizing the analog-to-digital conversion of a control chip, and sampling by adopting a special three-phase metering chip, wherein the two modes are low in measurement precision or high in measurement cost, and the measurement cost and the measurement precision cannot be simultaneously considered.

Disclosure of Invention

The application provides a residual current circuit breaker, and aims to solve the problem that the sampling mode of the residual current action circuit breaker with a three-phase voltage measurement display function to the power grid voltage in the related technology cannot be considered in both measurement cost and measurement accuracy.

In a first aspect, the present application provides a residual current circuit breaker including a buck module, a single-phase metering conversion module, and a control module;

the voltage reduction module is used for respectively carrying out voltage reduction treatment on the input three-phase voltage signals to obtain three-phase low-voltage signals corresponding to the three-phase voltage signals and common signals of the three-phase low-voltage signals, and respectively outputting the three-phase low-voltage signals and the common signals to the single-phase metering conversion module;

the single-phase metering conversion module is used for obtaining a digital voltage signal according to the three-phase low-voltage signal and the common signal and outputting the digital voltage signal to the control module;

and the control module is used for carrying out data processing on the digital voltage signals to obtain sampling voltage data.

In one possible implementation manner of the present application, the voltage step-down module includes a first voltage step-down unit, a second voltage step-down unit, a third voltage step-down unit, and a fourth voltage step-down unit;

the first voltage reduction unit is used for carrying out voltage reduction treatment on an A-phase voltage signal in the three-phase voltage signals to obtain an A-phase low-voltage signal and outputting the A-phase low-voltage signal to the single-phase metering conversion module;

the second voltage reducing unit is used for reducing the voltage of the B-phase voltage signal in the three-phase voltage signals to obtain the B-phase low-voltage signal and outputting the B-phase low-voltage signal to the single-phase metering conversion module;

the third voltage reducing unit is used for reducing the voltage of the C-phase voltage signal in the three-phase voltage signals to obtain the C-phase low-voltage signal and outputting the C-phase low-voltage signal to the single-phase metering conversion module;

and the fourth voltage reducing unit is used for respectively carrying out voltage reduction treatment on the A-phase low-voltage signal, the B-phase low-voltage signal and the C-phase low-voltage signal to obtain a public signal and outputting the public signal to the single-phase metering conversion module.

In one possible implementation of the present application, the first step-down unit, the second step-down unit, the third step-down unit, and the fourth step-down unit each include at least one step-down resistor.

In one possible implementation of the present application, the single-phase metering conversion module includes a single-phase metering chip that outputs a digital voltage signal to the control module via a high-speed full-duplex synchronous serial communication bus.

In one possible implementation of the present application, the residual current circuit breaker further includes a display module electrically connected to the control module, the display module configured to display the sampled voltage data in response to a display instruction of the control module.

In one possible implementation manner of the application, the residual current circuit breaker further comprises a rectification module electrically connected with the step-down module, wherein the rectification module is used for respectively performing half-wave rectification processing on the three-phase voltage signals to obtain direct-current voltage signals respectively corresponding to the three-phase voltage signals and outputting the direct-current voltage signals to the step-down module.

In one possible implementation manner of the present application, the rectifying module includes a first rectifying unit, a second rectifying unit, and a third rectifying unit;

the first rectifying unit is used for carrying out half-wave rectification treatment on an A-phase voltage signal in the three-phase voltage signals to obtain an A-phase direct current signal and outputting the A-phase direct current signal to the voltage reduction module;

the second rectifying unit is used for carrying out half-wave rectification treatment on a B-phase voltage signal in the three-phase voltage signals to obtain a B-phase direct current signal and outputting the B-phase direct current signal to the voltage reduction module;

and the third rectifying unit is used for carrying out half-wave rectification treatment on the C-phase voltage signals in the three-phase voltage signals to obtain C-phase direct current signals and outputting the C-phase direct current signals to the voltage reduction module.

In one possible implementation manner of the present application, the first rectifying unit, the second rectifying unit and the third rectifying unit respectively include at least one unidirectional conduction device.

In one possible implementation of the present application, the residual current circuit breaker further includes a power module for providing an operating voltage for the single-phase metering conversion module and the control module.

In one possible implementation manner of the present application, the residual current circuit breaker further includes a leakage detection module and an alarm module electrically connected with the control module respectively;

the leakage detection module is used for collecting residual current data in the three-phase voltage signals, amplifying the residual current data and outputting the amplified residual current data to the control module;

the control module is used for outputting an alarm instruction to the alarm module when the amplified residual current data is larger than a preset threshold value;

and the alarm module is configured to respond to the alarm instruction to send out alarm information and control the power supply loop to be disconnected.

From the above, the present application has the following advantages:

in this application, carry out the step-down processing through step-down module to three-phase voltage signal, obtain three-phase low voltage signal and public signal, single-phase measurement conversion module obtains digital voltage signal output to control module according to this three-phase low voltage signal and public signal again, digital voltage signal obtains sampling voltage data after control module handles, compared in the prior art and utilize control chip's analog-to-digital conversion to carry out voltage sampling and lead to measuring accuracy lower, adopt special three-phase measurement chip to carry out voltage sampling and lead to measuring cost higher, the residual current circuit breaker of this application realizes voltage sampling through single-phase measurement conversion module, can enough reduce measuring cost, can ensure measuring accuracy again, residual current circuit breaker's application scope and reliability have been improved greatly.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a residual current circuit breaker provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of a buck module provided in an embodiment of the present application;

FIG. 3 is a schematic circuit diagram of a buck module provided in an embodiment of the present application;

FIG. 4 is a schematic circuit diagram of a single-phase metering conversion module provided in an embodiment of the present application;

fig. 5 is another structural schematic diagram of the residual current circuit breaker provided in the embodiment of the present application;

FIG. 6 is a schematic diagram of a circuit of a rectifying module and a buck module according to an embodiment of the present disclosure;

fig. 7 is a schematic view of still another structure of the residual current circuit breaker provided in the embodiment of the present application;

FIG. 8 is a schematic diagram of a power module provided in an embodiment of the present application;

fig. 9 is a schematic view of still another structure of the residual current circuit breaker provided in the embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

It should be noted that in the embodiments of the present application, "connected" is understood to mean electrically connected, and two electrical components may be connected directly or indirectly between two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.

In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

The present application provides a residual current circuit breaker, which will be described in detail below.

Referring to fig. 1, fig. 1 is a schematic diagram of a functional block diagram of a residual current circuit breaker provided in an embodiment of the present application, the residual current circuit breaker 100 includes a step-down module 110, a single-phase metering conversion module 120 and a control module 130, the input end of the buck module 110 is connected to the external power grid 200, the output end of the buck module 110 is connected to the input end of the single-phase metering conversion module 120, and the output end of the single-phase metering conversion module 120 is connected to the control module 130.

The step-down module 110 may be configured to respectively step down the input three-phase voltage signals, so as to obtain three-phase low-voltage signals corresponding to the three-phase voltage signals and common signals of the three-phase low-voltage signals, and output the three-phase low-voltage signals to the single-phase metering conversion module 120.

The single-phase metering conversion module 120 may be configured to obtain a digital voltage signal from the three-phase low voltage signal and the common signal and output the digital voltage signal to the control module 130.

The control module 130 may be configured to perform data processing on the digital voltage signal to obtain sampled voltage data.

It can be understood that the three-phase voltage signal input to the step-down module 110 may be a three-phase ac voltage signal output by the external power grid 200, or may be a three-phase dc voltage signal obtained by rectifying a three-phase ac voltage signal output by the external power grid 200.

In this embodiment, the step-down module 110 performs step-down processing on the three-phase voltage signals, and may step down the three-phase voltage signals into corresponding three-phase low-voltage signals respectively to output to the single-phase metering conversion module 120, and meanwhile, the step-down module 110 may connect the branches corresponding to the three-phase low-voltage signals to a common point together, so as to obtain a common signal and output to the single-phase metering conversion module 120.

It can be appreciated that the buck module 110 may be implemented by any existing buck device or buck circuit, and specifically may be determined according to the actual application scenario, which is not limited herein.

Because the three-phase ac signal of the external power grid is an analog quantity, that is, an analog signal, the three-phase low-voltage signal is also an analog signal, and in order to facilitate the subsequent processing of the signal, in this embodiment of the present application, after the single-phase metering conversion module 120 receives the three-phase low-voltage signal and the common signal, the corresponding digital voltage signal in the power grid loop may be determined according to the three-phase low-voltage signal and the common signal, and the digital voltage signal may be output to the control module 130.

In this embodiment of the present application, any one of the control modules 130 may be a micro control unit (Micro Controller Unit, MCU), a single-chip microcomputer (Single Chip Microcomputer), or an integrated device such as a single-chip microcomputer, and after the control module 130 receives a digital voltage signal, it may perform data processing on the digital voltage signal according to an existing data processing program stored in advance, so as to obtain sampled voltage data, and a user may know the voltage state of the current power grid in real time according to the sampled voltage data.

In this embodiment, the step-down module 110 is used to step down the three-phase voltage signal to obtain the three 5-phase low-voltage signal and the common signal, the single-phase metering conversion module 120 obtains the digital voltage signal according to the three-phase low-voltage signal and the common signal, and outputs the digital voltage signal to the control module 130, and the digital voltage signal is processed by the control module 130 to obtain the sampled voltage data, which results in lower measurement accuracy compared with the voltage sampling by using the analog-to-digital conversion of the control chip in the related art, and the voltage sampling by using the special three-phase metering chip results in higher measurement cost

In other words, the residual current circuit breaker 100 of the present application realizes voltage sampling through the single-phase metering conversion module 120, which can reduce the measurement cost and ensure the measurement accuracy, and greatly improves the application range and reliability of the residual current circuit breaker 100.

Next, a detailed description of possible implementations of each functional module of the residual current circuit breaker shown in fig. 1 is continued.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a buck module provided in an embodiment of the present application, and in some embodiments of the present application, the buck module includes a first buck unit 111, a second buck unit 112, a third buck unit 113, and a fourth buck unit 114, where:

the first step-down unit 111 may be configured to step down an a-phase voltage signal of the three-phase voltage signals, so as to obtain an a-phase low-voltage signal, and output the a-phase low-voltage signal to the single-phase metering conversion module 120.

The second step-down unit 112 may be configured to step-down the B-phase voltage signal of the three-phase voltage signals by 0, and output the B-phase low-voltage signal to the single-phase metering conversion module 120.

The third step-down unit 113 may be configured to step down a C-phase voltage signal of the three-phase voltage signals, so as to obtain a C-phase low-voltage signal, and output the C-phase low-voltage signal to the single-phase metering conversion module 120.

The fourth step-down unit 114 may be configured to step-down the a-phase low-voltage signal, the B-phase low-voltage signal, and the C-phase low-voltage signal, respectively, to obtain a common signal, and output the common signal to the single-phase metering conversion module 120.

In this embodiment, for each phase of the three-phase voltage signals, a step-down unit is correspondingly provided to step down the three-phase voltage signals, so as to obtain a corresponding low-voltage signal and output the low-voltage signal to the single-phase metering conversion module 120.

For each low-voltage signal, the fourth step-down unit steps down each low-voltage signal and then connects the low-voltage signal and the zero line voltage signal to a common point, and outputs a common signal to the single-phase metering conversion module 120.

In one specific implementation, the first voltage reducing unit 111, the second voltage reducing unit 112, the third voltage reducing unit 113, and the fourth voltage reducing unit 114 respectively include at least one voltage reducing resistor, that is, the first voltage reducing unit 111, the second voltage reducing unit 112, the third voltage reducing unit 113, and the fourth voltage reducing unit 114 perform voltage reducing processing on the corresponding voltage signals in a manner of reducing the voltage by the resistors.

Referring to fig. 3, fig. 3 is a schematic circuit diagram of a voltage step-down module provided in an embodiment of the present application, in some embodiments, a first voltage step-down unit 111 includes a first resistor R1 and a second resistor R2, a second voltage step-down unit 112 includes a third resistor R3 and a fourth resistor R4, a third voltage step-down unit 113 includes a fifth resistor R5 and a sixth resistor R6, a fourth voltage step-down unit 114 includes a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and a specific circuit connection structure is as follows:

the first resistor R1 is connected in series with the second resistor R2, the first resistor R1 is connected with the power grid A phase signal line LA1, receives the A phase voltage signal L11, and the second resistor R2 outputs the A phase low voltage signal L1P to the single-phase metering conversion module 120; the third resistor R3 is connected in series with the fourth resistor R4, the third resistor R3 is connected with the B-phase signal line LB1 of the power grid, receives the B-phase voltage signal L22, and the fourth resistor R4 outputs the B-phase low-voltage signal L2P to the single-phase metering conversion module 120; the fifth resistor R5 is connected in series with the sixth resistor R6, the fifth resistor R5 is connected to the power grid C-phase signal line LC1, receives the C-phase voltage signal L33, and the sixth resistor R6 outputs the C-phase low voltage signal L3P to the single-phase metering conversion module 120.

It will be appreciated that in this scenario, the power grid a-phase voltage signal L11, the power grid B-phase voltage signal L22, and the power grid C-phase voltage signal L33 are all ac voltage signals, and thus, the a-phase low voltage signal L1P, B phase low voltage signal L2P and the C-phase low voltage signal L3P are also ac voltage signals.

The seventh resistor R7 is connected with the second resistor R2 and used for reducing the voltage of the phase A low-voltage signal L1P again; the eighth resistor R8 is connected with the fourth resistor R4 and used for reducing the voltage of the B-phase low-voltage signal L2P again; the ninth resistor R9 is connected to the sixth resistor R6, and steps down the C-phase low voltage signal L3P again, and the a-phase low voltage signal L1P, B phase low voltage signal L2P and the C-phase low voltage signal L3P after the step down again are connected to the common point N together with the zero line voltage signal from the zero line, and the common point N outputs a common signal to the single-phase metering conversion module 120.

It should be noted that, in some other application scenarios, the first voltage reducing unit 111, the second voltage reducing unit 112, and the third voltage reducing unit 113 may include more or less series resistors than those shown in fig. 3, and the fourth voltage reducing unit 114 may include more resistors than those shown in fig. 3, and the number of resistors may be determined according to the actual application scenario, which is not limited herein.

In some embodiments of the present application, the single-phase metering conversion module 120 may include a single-phase metering chip that may output a digital voltage signal to the control module 130 via a high-speed full-duplex synchronous serial communication bus.

In embodiments of the present application, the high-speed full duplex synchronous serial communication bus of the single-phase metering chip may communicate with the control module 130 based on a serial peripheral interface (Serial Peripheral Interface, SPI) communication protocol.

Fig. 4 is a schematic circuit diagram of a single-phase metering conversion module according to an embodiment of the present application, wherein a single-phase metering chip U6 with a model of ATT7053CU is selected as the single-phase metering chip, and a V1N end, i.e. a 9 th pin, of the single-phase metering chip U6 is connected to a common point N through a twenty-second resistor R22 for receiving a common signal; the V1P end, namely the 8 th pin, of the single-phase metering chip U6 is connected with the output end of the first voltage reduction unit 111 through a twenty-third resistor R23 and is used for receiving an A-phase low-voltage signal L1P; the V2P end, namely the 7 th pin, of the single-phase metering chip U6 is connected with the output end of the second voltage reduction unit 112 through a twenty-fourth resistor R24 and is used for receiving a B-phase low-voltage signal L2P; the V3N end, namely the 6 th pin, of the single-phase metering chip U6 is connected with the common point N through a twenty-fifth resistor R25 and is used for receiving common signals; the V3P end, i.e. the 5 th pin, of the single-phase metering chip U6 is connected to the output end of the third voltage reducing unit 113 through a twenty-sixth resistor R26, and is configured to receive the C-phase low voltage signal L3P.

The SPICLK/B0 terminal of the single-phase metering chip U6 receives the clock signal ad_clk from the control module 130 through the forty-first resistor R40, the SPIDI/TX terminal of the single-phase metering chip U6 outputs the digital voltage signal ad_do to the control module 130 through the forty-first resistor R41, the SPIDI/RX terminal of the single-phase metering chip U6 receives the input signal ad_di from the control module 130 through the forty-second resistor R42, and the SPICS/B1 terminal of the single-phase metering chip U6 receives the chip select signal ad_cs from the control module 130 through the forty-third resistor R43 to realize communication between the single-phase metering chip U6 and the control module 130.

Referring to fig. 5, fig. 5 is a schematic diagram of another functional module of the residual current circuit breaker provided in the embodiments of the present application, in some embodiments of the present application, the residual current circuit breaker 100 may further include a rectifying module 140 electrically connected to the step-down module 110, where the rectifying module 140 may be configured to perform half-wave rectification processing on three-phase voltage signals respectively, so as to obtain direct-current voltage signals corresponding to the three-phase voltage signals respectively, and output the direct-current voltage signals to the step-down module 110.

Specifically, the rectifying module 140 may include a first rectifying unit 141, a second rectifying unit 142, and a third rectifying unit 143, wherein:

the first rectifying unit 141 may be configured to perform half-wave rectification processing on the a-phase voltage signal, so as to obtain an a-phase direct current signal, and output the a-phase direct current signal to the step-down module 110;

the second rectifying unit 142 may be configured to perform half-wave rectification on the B-phase voltage signal, so as to obtain a B-phase direct current signal, and output the B-phase direct current signal to the step-down module 110;

the third rectifying unit 143 may be configured to perform half-wave rectification processing on the C-phase voltage signal, so as to obtain a C-phase direct current signal, and output the C-phase direct current signal to the step-down module 110.

In a specific implementation, the first rectifying unit 141, the second rectifying unit 142, and the third rectifying unit 143 may include at least one unidirectional conduction device, respectively, so as to perform half-wave rectification processing on the voltage signal of each phase alternating current through the unidirectional conduction principle of the unidirectional conduction device.

As shown in fig. 6, fig. 6 is a schematic circuit diagram of a rectifying module and a buck module provided in an embodiment of the present application, in some embodiments of the present application, a first rectifying unit 141 includes a first diode D1 and a second diode D2, a second rectifying unit 142 includes a third diode D3 and a fourth diode D4, a third rectifying unit 143 includes a fifth diode D5 and a sixth diode D6, and a specific circuit connection structure is:

the first diode D1 and the second diode D2 are connected in parallel, the anode of the first diode D1 is connected with the power grid A phase signal line LA1 to receive an A phase voltage signal L11, the cathode of the second diode D2 is connected with the first resistor R1 to output an A phase direct current signal L1, the A phase direct current signal L1 is reduced by the first resistor R1 and the second resistor R2 which are connected in series to obtain an A phase low voltage signal L1P, and the A phase low voltage signal L1P is output to the single-phase metering conversion module 120, for example, the A phase voltage signal L11 with the voltage of 230V can be converted into an A phase low voltage signal L1P with the voltage below 0.5V of pulsating direct current;

the third diode D3 and the fourth diode D4 are connected in parallel, the anode of the third diode D3 is connected with the B-phase signal line LB1 of the power grid, and receives the B-phase voltage signal L22, the cathode of the fourth diode D4 is connected with the third resistor R3, and is used for outputting a B-phase direct current signal L2, and the B-phase direct current signal L2 is reduced by the third resistor R3 and the fourth resistor R4 which are connected in series to obtain a B-phase low voltage signal L2P, and then the B-phase low voltage signal L2P is output to the single-phase metering conversion module 120, for example, the B-phase voltage signal L22 with 230V can be converted into a B-phase low voltage signal L2P with a pulse direct current of less than 0.5V;

the fifth diode D5 and the sixth diode D6 are connected in parallel, an anode of the fifth diode D5 is connected to the power grid C-phase signal line LC1, and receives the C-phase voltage signal L33, a cathode of the sixth diode D6 is connected to the fifth resistor R5, and is used for outputting a C-phase direct current signal L3, and the C-phase direct current signal L3 is reduced by the fifth resistor R5 and the sixth resistor R6 which are connected in series to obtain a C-phase low voltage signal L3P, and then is output to the single-phase metering conversion module 120, for example, the C-phase voltage signal L33 with the voltage of 230V can be converted into a C-phase low voltage signal L1P with the voltage of less than 0.5V.

Based on the unidirectional conduction characteristic of the diode, each branch in fig. 6 is conducted when the corresponding power grid voltage signal is located in the positive half cycle of the sine cycle, and is not conducted when the corresponding power grid voltage signal is located in the negative half cycle of the sine cycle, so that half-wave rectification processing of the power grid voltage signal is realized.

In this embodiment, the rectification module 140 performs half-wave rectification on the power grid voltage signal, so that the control module 130 can timely judge the phase failure when a certain phase branch circuit is broken, and electricity safety is ensured.

As shown in fig. 7, fig. 7 is a schematic diagram of another functional module of the residual current circuit breaker provided in the embodiments of the present application, in some embodiments of the present application, the residual current circuit breaker 100 may further include a display module 150 electrically connected to the control module 130, and the display module 150 may be configured to display the sampled voltage data in response to a display instruction of the control module 130.

In the embodiment of the present application, the display module 150 may be any existing display screen, including but not limited to a liquid crystal (Liquid Crystal Display, LCD) display screen, a light emitting diode (Light Emitting Diode, LED) display screen, and the like.

The control module 130 and the display module 150 may also communicate using an SPI protocol, and the control module 130 may output a display instruction to the display module 150 based on the SPI protocol, so as to control the display module 150 to display the measured sampled voltage data.

With continued reference to fig. 7, in some embodiments of the present application, the residual current circuit breaker 100 may further include a power module 160, where the power module 160 may be configured to provide an operating voltage to the single-phase metering conversion module 120 and the control module 130.

In this embodiment, the power module 160 may be connected to the external power grid 200, and convert the three-phase voltage signal output by the external power grid 200 into a voltage signal adapted to the single-phase metering conversion module 120 and the control module 130, so as to provide working voltages for the single-phase metering conversion module 120 and the control module 130.

As shown in fig. 8, fig. 8 is a schematic structural diagram of a power module provided in an embodiment of the present application, in a specific implementation, a power module 160 may include a rectifier bridge 161, a switching power supply unit 162, and a dc conversion unit 163, where the rectifier bridge 161 may be used to rectify a three-phase voltage signal, so as to obtain a dc voltage signal and output the dc voltage signal to the switching power supply unit 162; the switching power supply unit 162 may perform voltage stabilizing processing on the dc voltage signal, and obtain a 12V dc voltage stabilizing signal VCC1, and output the dc voltage stabilizing signal VCC1 to the dc conversion unit 163; the dc conversion unit 163 may step down and stabilize the 12V dc voltage stabilizing signal VCC1 to a 3.3V dc voltage signal VCC2 to obtain a 3.3V operating voltage adapted to the single-phase metering conversion module 120 and the control module 130.

It is understood that the 12V dc voltage stabilizing signal VCC1 output by the switching power supply unit 162 may also be used to power the display module 150.

In the embodiment of the present application, the trimming bridge 161 may be any existing bridge rectifying circuit or full-wave rectifying circuit; the switching power supply unit 162 may be any existing switching power supply module or switching power supply circuit; the DC conversion unit 163 may be any of the existing DC-DC converters including, but not limited to, a buck DC/DC converter, a boost DC/DC converter, and the like.

It can be appreciated that the above-mentioned 12V dc voltage stabilizing signals VCC1 and 3.3V dc voltage signal VCC2 are only an example of the present application, and in other application scenarios, the voltage magnitudes of the dc voltage stabilizing signals VCC1 and VCC2 may also be other values, which may be specifically determined according to the actual application scenario, and are not limited herein.

Referring to fig. 9, fig. 9 is a schematic diagram of still another structure of the residual current circuit breaker provided in the embodiments of the present application, and in some embodiments of the present application, the residual current circuit breaker 100 may further include a leakage detection module 170 and an alarm module 180 electrically connected to the control module 130, respectively.

The leakage detection module 170 may be configured to collect residual current data in the three-phase voltage signal, amplify the residual current data, and output the amplified residual current data to the control module 130.

The control module 130 may be configured to output an alarm command to the alarm module 180 when the amplified residual current data is greater than a preset threshold.

The alarm module 180 may be configured to issue alarm information and control the power supply loop to open in response to an alarm instruction.

In this embodiment, the leakage detection module 170 may include a zero sequence transformer and an operational amplifier, and collect residual current data in the three-phase voltage signal by sensing the zero sequence transformer, input the collected residual current data into the operational amplifier, amplify the residual current data by the operational amplifier, and output the amplified residual current data to the control module 130; the control module 130 compares the received amplified residual current data with a preset threshold value, if the amplified residual current data is smaller than or equal to the preset threshold value, the circuit can be considered to be normally operated at present, if the amplified residual current data is larger than the preset threshold value, the residual current in the current circuit can be determined to be larger, and potential safety hazards exist, at this time, the control module 130 can output an alarm instruction to the alarm module 180, so that the alarm module 180 responds to the alarm instruction to send alarm information and simultaneously control the relay to act, the power supply loop is disconnected, and the power utilization accident is avoided.

In one implementation, the alarm information may be a light alarm information, for example, the alarm module 180 includes an indicator light, and when an alarm instruction is received, the indicator light may be driven to emit light, so as to prompt the user that the current circuit has a potential safety hazard.

In another implementation, the alarm information may be an audible alarm, for example, the alarm module 180 includes a speaker that can be driven to sound when an alarm command is received, thereby prompting the user that a safety hazard exists in the current circuit.

In yet another specific implementation, the alarm information may be an audible and visual alarm, for example, the alarm module 180 includes an indicator light and a speaker, and when receiving an alarm instruction, the indicator light may be driven to emit light and the speaker may be driven to emit sound, so as to prompt the user that the current circuit has a potential safety hazard.

It can be understood that, in addition to providing the single-phase metering conversion module 120 and the control module 130 with the 3.3V operating voltage, the 12V dc voltage stabilizing signal VCC1 output by the switching power supply unit 162 can be used to supply power to the indicator light, the speaker, the relay, etc. of the alarm module 180 by the power supply module 160 in the above embodiment; the 3.3V dc voltage signal VCC2 output by the dc conversion unit 163 may also be used to power an operational amplifier in the leakage detection module 170.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

In the implementation, each unit or structure may be implemented as an independent entity, or may be implemented as the same entity or several entities in any combination, and the implementation of each unit or structure may be referred to the foregoing embodiments and will not be repeated herein.

The foregoing has outlined a detailed description of a residual current circuit breaker provided herein, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above description being only for the purpose of aiding in the understanding of the circuit breaker and its core concept; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.

Claims (10)

1. The residual current circuit breaker is characterized by comprising a step-down module, a single-phase metering conversion module and a control module;

the step-down module is used for respectively carrying out step-down processing on the input three-phase voltage signals to obtain three-phase low-voltage signals corresponding to the three-phase voltage signals and common signals of the three-phase low-voltage signals, and respectively outputting the three-phase low-voltage signals and the common signals to the single-phase metering conversion module;

the single-phase metering conversion module is used for obtaining a digital voltage signal according to the three-phase low-voltage signal and the common signal and outputting the digital voltage signal to the control module;

and the control module is used for carrying out data processing on the digital voltage signals to obtain sampling voltage data.

2. The residual current circuit breaker according to claim 1, wherein the step-down module includes a first step-down unit, a second step-down unit, a third step-down unit, and a fourth step-down unit;

the first voltage reducing unit is used for reducing the voltage of an A-phase voltage signal in the three-phase voltage signals to obtain an A-phase low-voltage signal and outputting the A-phase low-voltage signal to the single-phase metering conversion module;

the second voltage reducing unit is used for reducing the voltage of the B-phase voltage signal in the three-phase voltage signals to obtain a B-phase low-voltage signal and outputting the B-phase low-voltage signal to the single-phase metering conversion module;

the third voltage reducing unit is used for reducing the voltage of the C-phase voltage signal in the three-phase voltage signals to obtain a C-phase low-voltage signal and outputting the C-phase low-voltage signal to the single-phase metering conversion module;

the fourth step-down unit is configured to step down the phase a low-voltage signal, the phase B low-voltage signal, and the phase C low-voltage signal, to obtain the common signal, and output the common signal to the single-phase metering conversion module.

3. The residual current circuit breaker according to claim 2, wherein the first step-down unit, the second step-down unit, the third step-down unit, and the fourth step-down unit each include at least one step-down resistor.

4. The residual current circuit breaker according to claim 1, wherein the single-phase metering conversion module comprises a single-phase metering chip outputting the digital voltage signal to the control module via a high-speed full-duplex synchronous serial communication bus.

5. The residual current circuit breaker according to claim 1, further comprising a display module electrically connected to the control module, the display module configured to display the sampled voltage data in response to a display instruction of the control module.

6. The residual current circuit breaker according to claim 1, further comprising a rectifying module electrically connected to the step-down module, wherein the rectifying module is configured to perform half-wave rectification processing on the three-phase voltage signals, respectively, to obtain direct-current voltage signals corresponding to the three-phase voltage signals, respectively, and output the direct-current voltage signals to the step-down module.

7. The residual current circuit breaker according to claim 6, wherein the rectifying module comprises a first rectifying unit, a second rectifying unit, and a third rectifying unit;

the first rectifying unit is used for carrying out half-wave rectification treatment on an A-phase voltage signal in the three-phase voltage signals to obtain an A-phase direct current signal and outputting the A-phase direct current signal to the voltage reduction module;

the second rectifying unit is used for performing half-wave rectification treatment on a B-phase voltage signal in the three-phase voltage signals to obtain a B-phase direct current signal and outputting the B-phase direct current signal to the voltage reduction module;

and the third rectifying unit is used for carrying out half-wave rectification treatment on the C-phase voltage signals in the three-phase voltage signals to obtain C-phase direct current signals and outputting the C-phase direct current signals to the voltage reduction module.

8. The residual current circuit breaker according to claim 7, wherein the first rectifying unit, the second rectifying unit and the third rectifying unit each comprise at least one unidirectional conducting device.

9. The residual current circuit breaker according to claim 1, further comprising a power module for providing an operating voltage for the single-phase metering conversion module and the control module.

10. The residual current circuit breaker according to claim 1, further comprising a leakage detection module and an alarm module electrically connected with the control module, respectively;

the leakage detection module is used for collecting residual current data in the three-phase voltage signals, amplifying the residual current data and outputting the amplified residual current data to the control module;

the control module is used for outputting an alarm instruction to the alarm module when the amplified residual current data is larger than a preset threshold value;

the alarm module is configured to respond to the alarm instruction to send out alarm information and control the power supply loop to be disconnected.

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