CN117686779A - Measuring device, circuit breaker and measuring method - Google Patents

Abstract

The application provides a measuring device, a circuit breaker and a measuring method, and relates to the technical field of piezoelectric devices. The auxiliary power supply circuit is used for converting the main loop voltage into a first target voltage and supplying power for the processing unit; the power supply circuit is used for converting the output current of the current transformer and supplying power to the processing unit when the switch circuit is in an off state; the processing unit is used for detecting the voltage value of the first target voltage, outputting a first control signal to the switching circuit if the voltage value is determined to be larger than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit; the switching circuit is used for switching to a conducting state according to the first control signal to discharge the output current of the current transformer, so that the power can be supplied to the processing unit only through the auxiliary power supply circuit, the influence of the power change of the processing unit on the output current of the current transformer is avoided, the measuring circuit is ensured to work under a constant working condition, and the accuracy of a measuring result is improved.

Description

Measuring device, circuit breaker and measuring method

Technical Field

The application relates to the technical field of piezoelectric devices, in particular to a measuring device, a circuit breaker and a measuring method.

Background

A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time.

In the prior art, based on the requirement of current self-power supply, a breaker adopts two schemes to realize the functions of current transformer power supply and measurement, one is a mode of adopting a hollow transformer and a fast saturation transformer, wherein the power supply function is realized based on the fast saturation transformer, and the measurement function is realized based on the hollow transformer; the other is to adopt an iron core transformer, and the power supply function and the measurement function are realized based on the iron core transformer.

Aiming at the implementation mode, when power is supplied based on the iron core transformer, a processing unit is always arranged in the circuit breaker, and the power change of the processing unit can influence a measuring circuit, so that the existing circuit breaker has the problem of low current measuring precision of the transformer.

Disclosure of Invention

The present application aims to provide a measuring device, a circuit breaker and a measuring method, which can improve the measuring accuracy of the current of a transformer, aiming at the defects in the prior art.

In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

in a first aspect, the invention provides a measuring device, comprising a current transformer, a processing unit, a power supply circuit, a measuring circuit, a switching circuit and an auxiliary power supply circuit, wherein the auxiliary power supply circuit supplies power through the voltage of a main loop where a circuit breaker is positioned;

one end of the current transformer is electrically connected with one end of the switching circuit, the other end of the switching circuit is electrically connected with one end of the power supply circuit, and a first output end of the power supply circuit is electrically connected with a first power supply end of the processing unit;

the other end of the current transformer is electrically connected with one end of the measuring circuit, the first control end of the processing unit is electrically connected with the control end of the switching circuit, and the first measuring end of the processing unit is electrically connected with the other end of the measuring circuit;

the first power supply output end of the auxiliary power supply circuit is electrically connected with the second power supply end of the processing unit, and the auxiliary power supply circuit is used for converting the main loop voltage into a first target voltage and supplying power to the processing unit through the first target voltage;

the power supply circuit is used for converting the output current of the current transformer when the switch circuit is in an off state, obtaining a second target voltage and supplying power to the processing unit;

the processing unit is used for detecting the voltage value of the first target voltage based on the second power supply end, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is determined to be greater than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit;

the switching circuit is used for switching to a conducting state according to the first control signal so as to discharge the output current of the current transformer.

In an optional embodiment, the processing unit is further configured to detect a voltage value of the first target voltage, and if it is determined that the voltage value of the first target voltage is less than a preset voltage threshold, output a second control signal to the switching circuit;

the switching circuit is further configured to switch from the on state to the off state according to the second control signal, so that power is supplied to the processing unit through the power supply circuit.

In an alternative embodiment, the second control signal is a pulse width modulated signal; the processing unit is specifically configured to obtain a second output current parameter of the current transformer through the measurement circuit, and determine a target duty cycle of the pulse width modulation signal according to the second output current parameter and a preset duty cycle mapping relationship; and determining the second control signal according to the target duty ratio of the pulse width modulation signal.

In an alternative embodiment, the measuring device further comprises: the current transformer is connected with one end of the switch circuit, and the other end of the switch circuit is connected with the other end of the current transformer;

the rectification circuit is used for converting the alternating current signal output by the current transformer into a direct current signal.

In an alternative embodiment, the measuring device further comprises: the first power end of the load circuit is electrically connected with the second output end of the power circuit, the second power end of the load circuit is electrically connected with the second power supply output end of the auxiliary power circuit, and the control end of the load circuit is electrically connected with the second control end of the processing unit;

the power supply circuit is further used for converting the output current of the current transformer when the switching circuit is in an off state, obtaining a third target voltage and supplying power to the load circuit;

the auxiliary power supply circuit is further configured to convert the main loop voltage into a fourth target voltage, and supply power to the load circuit through the fourth target voltage.

In an alternative embodiment, the load circuit includes: a communication circuit;

the processing unit is further configured to send the first output current parameter to a user terminal through the communication circuit.

In an alternative embodiment, the load circuit further comprises: an alarm circuit;

the processing unit is further configured to output a first alarm signal through the alarm circuit if the first output current parameter does not meet a preset requirement.

In an optional implementation manner, the processing unit is further configured to generate a second alarm signal if the first output current parameter does not meet a preset requirement, and send the second alarm signal to the user terminal through the communication circuit.

In an alternative embodiment, the switching circuit includes: at least one of metal oxide semiconductor field effect transistor and semiconductor triode.

In an optional implementation manner, the processing unit is specifically configured to obtain, through the communication circuit, a first control instruction sent by the user terminal; and detecting the voltage value of the first target voltage according to the first control instruction, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is larger than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit.

In an alternative embodiment, the current transformer comprises a core transformer.

In a second aspect, the present invention provides a circuit breaker comprising a circuit breaker body and a measuring device as described in any of the previous embodiments, the measuring device being disposed within the circuit breaker body.

In a third aspect, the present invention provides a measurement method applied to the processing unit in the measurement device according to any one of the foregoing embodiments, the method including:

detecting a voltage value of a first target voltage, and outputting a first control signal to a switching circuit if the voltage value of the first target voltage is determined to be larger than a preset voltage threshold, wherein the first control signal is used for switching the switching circuit into a conducting state so as to drain the output current of the current transformer;

a first output current parameter of the current transformer is obtained through a measuring circuit.

The beneficial effects of this application are:

in the measurement device provided by the embodiment of the application, the auxiliary power supply circuit is used for converting the main loop voltage into the first target voltage and supplying power for the processing unit through the first target voltage; the power supply circuit is used for converting the output current of the current transformer when the switch circuit is in an off state, obtaining a second target voltage and supplying power to the processing unit; the processing unit is used for detecting the voltage value of the first target voltage, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is larger than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit; the switching circuit is used for switching to the conducting state according to the first control signal to discharge the output current of the current transformer, and by applying the embodiment of the application, the power supply can be realized for the processing unit only through the auxiliary power supply circuit, the influence of the power change of the processing unit on the output current of the current transformer is avoided, so that the measuring circuit can be ensured to work under a constant working condition, the measuring precision of the measuring circuit can be improved, and the accuracy of the measuring result is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic functional block diagram of a measurement device according to an embodiment of the present application;

FIG. 2 is a schematic functional block diagram of another measurement device according to an embodiment of the present disclosure;

FIG. 3 is a schematic functional block diagram of another measurement device according to an embodiment of the present disclosure;

FIG. 4 is a schematic functional block diagram of another measurement device according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a measurement method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the prior art, based on the requirement of current self-power supply, when the circuit breaker realizes both a power supply function and a measurement function based on the iron core transformer, the transformer current of the iron core transformer is generally measured by means of a measurement circuit in the circuit breaker, a processing unit is often arranged in the circuit breaker, and the power change of the processing unit affects the measurement circuit, so that the existing circuit breaker has the problem of lower current measurement precision of the transformer.

In view of this, the embodiment of the present application provides a measuring device, which can improve the measurement accuracy of the current of the transformer.

Fig. 1 is a schematic functional block diagram of a measurement device according to an embodiment of the present application, as shown in fig. 1, the measurement device may include a current transformer 110, a processing unit 120, a power supply circuit 130, a measurement circuit 140, a switching circuit 150, and an auxiliary power supply circuit 160, and optionally, the processing unit 120, the power supply circuit 130, the measurement circuit 140, the switching circuit 150, and the auxiliary power supply circuit 160 may be disposed on a circuit board in the measurement device; the auxiliary power circuit 160 is powered by the main circuit voltage at which the circuit breaker is located, i.e. the grid voltage.

One end of the current transformer 110 is electrically connected to one end of the switch circuit 150, the other end of the switch circuit 150 is electrically connected to one end of the power circuit 130, a first output end of the power circuit 130 is electrically connected to a first power end of the processing unit 120, a first control end of the processing unit 120 is electrically connected to a control end of the switch circuit 150, the other end of the current transformer is electrically connected to one end of the measurement circuit, and a first measurement end of the processing unit 120 is electrically connected to the other end of the measurement circuit 140.

The processing unit 120 is configured to output an on signal or an off signal to the switching circuit 150, and the switching circuit 150 controls the switching circuit to be in an on state or an off state according to the on signal or the off signal output by the processing unit 120.

The power supply circuit 130 is configured to convert an output current of the current transformer 110 to obtain a second target voltage and supply power to the processing unit 120 when the switch circuit 150 is in an off state, where the current transformer 110 may convert a primary side large current into a secondary side small current according to an electromagnetic induction principle, that is, the secondary side small current may supply power to the processing unit 120 after being converted into the second target voltage by the power supply circuit 130, where the primary side large current is a main loop current where the circuit breaker is located. The voltage converted by the power supply circuit 130 may be used to supply power to the measurement circuit 140 or the like according to the actual application, and is not limited herein. Alternatively, the second target voltage may be 3.3V, 5V, 12V, 24V, etc., which is not limited herein, and may be different according to actual application scenarios.

The first power supply output terminal of the auxiliary power supply circuit 160 is electrically connected to the second power supply terminal of the processing unit 120, and the auxiliary power supply circuit is configured to convert the main loop voltage into a first target voltage, and supply power to the processing unit 120 through the first target voltage. Alternatively, the first target voltage may be 3.3V, 5V, 12V, 24V, etc., which is not limited herein, and may be different according to actual application scenarios.

The processing unit 120 may perform power supply based on the second power supply terminal, and may further measure a voltage value of the first target voltage based on the second power supply terminal, if it is determined that the voltage value of the first target voltage is greater than a preset voltage threshold, output a first control signal to the switching circuit 150, and obtain, based on the first measurement terminal, a first output current parameter of the current transformer 110 through the measurement circuit 140, where the switching circuit 150 is configured to switch to a conductive state according to the first control signal to drain an output current of the current transformer 110. Alternatively, the first control signal may be a high level signal.

It should be noted that the first target voltage and the second target voltage may be the same or different, and are not limited herein, for example, in some embodiments, when the switch circuit is in an off state, the power circuit 130 may convert the output current of the current transformer 110 to obtain the second target voltage and supply power to the processing unit 120; meanwhile, the auxiliary power circuit 160 may convert the main loop voltage into the first target voltage, and then supply power to the processing unit 120 through the second power end of the processing unit 120, so as to realize dual power supply to the processing unit 120, and further improve the reliability of the operation of the processing unit 120.

When the switch circuit 150 is in a conducting state, the current transformer 110 and the switch circuit 150 form a loop, so that the output current of the current transformer 110 is discharged, and then the output current of the current transformer 110 cannot be used for supplying power to the processing unit 120, so that the influence of the power change of the processing unit 120 on the output current of the current transformer 110 can be avoided, the measurement circuit 140 is ensured to work under a constant working condition, and further, a more accurate measurement result can be obtained and the measurement precision is improved when the first output current parameter of the current transformer 110 is acquired based on the measurement circuit 140.

In summary, an embodiment of the present application provides a measurement device, where one end of a current transformer is electrically connected to one end of a switching circuit, the other end of the switching circuit is electrically connected to one end of a power supply circuit, and a first output end of the power supply circuit is electrically connected to a first power supply end of a processing unit; the other end of the current transformer is electrically connected with one end of the measuring circuit, the first control end of the processing unit is electrically connected with the control end of the switching circuit, and the first measuring end of the processing unit is electrically connected with the other end of the measuring circuit; the first power supply output end of the auxiliary power supply circuit is electrically connected with the second power supply end of the processing unit, and the auxiliary power supply circuit is used for converting the main loop voltage into a first target voltage and supplying power for the processing unit through the first target voltage; the power supply circuit is used for converting the output current of the current transformer when the switch circuit is in an off state, obtaining a second target voltage and supplying power to the processing unit; the processing unit is used for detecting the voltage value of the first target voltage, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is larger than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit; the switching circuit is used for switching to the conducting state according to the first control signal to discharge the output current of the current transformer, and by applying the embodiment of the application, the power supply can be realized for the processing unit only through the auxiliary power supply circuit, the influence of the power change of the processing unit on the output current of the current transformer is avoided, so that the measuring circuit can be ensured to work under a constant working condition, the measuring precision of the measuring circuit can be improved, and the accuracy of the measuring result is improved.

Optionally, the processing unit 120 is further configured to detect a voltage value of the first target voltage, and if it is determined that the voltage value of the first target voltage is less than the preset voltage threshold, output a second control signal to the switch circuit 150; the switch circuit 150 is further configured to switch from an on state to an off state according to the second control signal, so that power is supplied to the processing unit 120 through the power supply circuit 130.

It can be understood that, if the processing unit 120 detects that the voltage value of the first target voltage of the auxiliary power supply circuit 160 is smaller than the preset voltage threshold, which indicates that the voltage value of the first target voltage of the auxiliary power supply circuit 160 does not meet the power supply requirement of the processing unit 120, in this case, the processing unit 120 may output the second control signal to the switch circuit 150, and then the switch circuit 150 may be switched to the off state, where when the switch circuit 150 is in the off state, the output current of the current transformer 110 may be converted by the power supply circuit 130 to supply power to the processing unit 120, that is, the processing unit 120 may be powered by the second target voltage converted by the power supply circuit 130 and the first target voltage of the auxiliary power supply circuit 160, so that the normal operation of the processing unit 120 may be ensured, and the reliability of the measuring device may be improved.

Optionally, the second control signal is a pulse width modulation signal; the processing unit 120 is specifically configured to obtain a second output current parameter of the current transformer 110 through the measurement circuit 140, and determine a target duty cycle of the pwm signal according to the second output current parameter and a preset duty cycle mapping relationship; the second control signal is determined based on a target duty cycle of the pulse width modulated signal.

Optionally, the second control signal may include control parameters such as a conduction duration, a start conduction time, an end conduction time, and the like of the switch circuit, which are not limited herein. The target duty cycle of the pwm signal may represent the on-time of the switching circuit in the second control signal, i.e. the on-time of the switching circuit in the second control signal may be determined according to the target duty cycle.

The preset duty ratio mapping relationship may include: the mapping relation between the output current parameter of the current transformer and the duty ratio of the pulse width modulation signal, wherein the larger the output current parameter of the current transformer is, the larger the duty ratio of the corresponding pulse width modulation signal is, the larger the duty ratio of the pulse width modulation signal is, the longer the on-time of the switch circuit is, and the more the discharge current is.

Based on the above description, after the second output current parameter of the current transformer 110 is obtained, the target duty ratio of the pwm signal corresponding to the second output current parameter may be determined based on the preset duty ratio mapping relationship. It should be noted that, if the second control signal is a pwm signal, alternatively, the switch circuit 150 may be in an on state during a high level phase of the pwm signal, and the switch circuit 150 may be in an off state during a low level phase of the pwm signal. The switch circuit 150 may be in a conducting state, and thus, the method described above may be referred to as obtaining a more accurate measurement result based on the measurement circuit 140 when obtaining the first output current parameter of the current transformer 110, thereby improving the measurement accuracy.

Fig. 2 is a schematic functional block diagram of another measurement device according to an embodiment of the present application. Optionally, as shown in fig. 2, the measuring device further includes: a rectifier circuit 180, one end of the current transformer 110 is electrically connected to one end of the rectifier circuit 180, and the other end of the rectifier circuit 180 is electrically connected to one end of the switch circuit 150;

the rectifying circuit 180 is configured to convert an ac current signal output by the current transformer 110 into a dc current signal.

It will be appreciated that, for the current transformer 110, the secondary side small current after the conversion of the current transformer 110 is an ac current signal, so it is necessary to convert the ac current signal into a dc current signal through the rectifying circuit 180, and further, the dc current signal can be converted into a second target voltage through the power circuit 130, and the processing unit 120 is powered through the second target voltage.

Fig. 3 is a schematic functional block diagram of another measurement device according to an embodiment of the present application. Optionally, as shown in fig. 3, the measurement device further includes: the first power end of the load circuit 170 is electrically connected with the second output end of the power circuit 130, the second power end of the load circuit 170 is electrically connected with the second power supply output end of the auxiliary power circuit 160, and the control end of the load circuit 170 is electrically connected with the second control end of the processing unit;

the power supply circuit 130 is further configured to convert an output current of the current transformer 110 when the switch circuit is in an off state, obtain a third target voltage, and supply power to the load circuit 170; the auxiliary power circuit 160 is further configured to convert the main loop voltage into a fourth target voltage, and supply power to the load circuit 170 through the fourth target voltage.

The third target voltage and the fourth target voltage may be the same or different, and are not limited herein. In some embodiments, when the switch circuit is in an off state, the power circuit 130 may convert the output current of the current transformer 110 to obtain a third target voltage and supply power to the load circuit 170; meanwhile, the auxiliary power circuit 160 may convert the main loop voltage into a fourth target voltage, and supply power to the load circuit 170 through the fourth target voltage based on the second power supply output end, so as to realize dual power supply to the load circuit 170, and improve the reliability of the operation of the load circuit 170 in the measuring device.

In addition, it should be noted that, when specifically electrically connected, the second control end of the processing unit 120 may be electrically connected to the control end of the load circuit 170, so as to output a second control instruction to the load circuit 170 based on the second control end according to an actual application scenario; an input of the processing unit 120 may be electrically connected to an output of the load circuit 170, for receiving a measurement parameter or the like sent by the load circuit 170 based on the input, which is not limited herein. In addition, the third target voltage is taken as an example for explanation, the present application is not limited to the magnitude relation between the third target voltage and the first target voltage and the second target voltage, and the third target voltage may be the same as or different from the first target voltage and the second target voltage according to the actual application scenario.

Fig. 4 is a schematic functional block diagram of another measurement device according to an embodiment of the present application. Optionally, as shown in fig. 4, the load circuit 170 includes: a communication circuit 171; the processing unit 120 is further configured to send the first output current parameter to the user terminal via the communication circuit 171.

In some embodiments, the communication circuit may be a wireless communication circuit, such as a WiFi communication circuit, a bluetooth communication circuit, etc., which are not limited herein, and may be different according to actual application scenarios.

Based on the above description, the processing unit 120 obtains the first output current parameter of the current transformer through the measurement circuit 140, and according to an actual application scenario, the first output current parameter may also be sent to the user terminal through the communication circuit 171, so that it may be ensured that the user may obtain the first output current parameter of the current transformer 110 in real time through the user terminal, and further may monitor the working state of the current transformer 110 according to the first output current parameter, or may calculate the current parameter of the primary side according to the first output current parameter and the setting parameter of the current transformer 110, so as to improve the applicability of the measurement device.

Optionally, the load circuit 170 may further include: and the processing unit is also used for outputting a first alarm signal through the alarm circuit if the first output current parameter does not meet the preset requirement.

The first alarm signal may be an audio alarm signal, a light alarm signal, etc., which is not limited herein, and may be flexibly selected according to an actual application scenario. The alarm circuit may also be a circuit unit that outputs the first alarm signal, and may be different according to the first alarm signal.

Optionally, the preset requirement may include a preset current threshold range, and if the first output current parameter does not exceed the preset current threshold range, it is indicated that the first output current parameter meets the preset requirement; otherwise, the first output current parameter is not in accordance with the preset requirement, and then the first alarm signal can be output through the alarm circuit.

Based on the above description, when the measuring device provided by the embodiment of the application is applied to the circuit breaker, the working state of the circuit breaker can be timely reminded of a worker through the first alarm signal, so that the circuit breaker can be timely maintained or replaced, and the reliability of the circuit breaker can be improved.

It should be noted that, the load circuit 170 may further include other functional circuits in addition to the communication circuit 171 and the alarm circuit according to the actual application scenario, which is not limited herein, and may be different according to the actual application scenario.

Optionally, the processing unit 120 is further configured to generate a second alarm signal if the first output current parameter does not meet the preset requirement, and send the second alarm signal to the user terminal through the communication circuit 171.

Of course, in some embodiments, if the first output current parameter does not meet the preset requirement, the processing unit 120 may further generate a second alarm signal, and send the second alarm information to the user terminal through the above communication circuit, so as to implement remote alarm and improve the applicability of the circuit breaker.

Optionally, the second alarm signal may be sent to the user terminal in a form of mail, short message, etc., where the representation form of the second alarm signal is not limited, and may be different according to the actual application scenario.

Optionally, the switching circuit 150 includes: at least one of Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and a semiconductor triode.

The metal oxide semiconductor field effect transistor may be an NMOSFET or a PMOSFET, which is not limited herein, and may be flexibly selected according to an actual application scenario.

Optionally, the processing unit 120 is specifically configured to obtain, through the communication circuit 171, a first control instruction sent by the user terminal; according to the first control instruction, detecting a voltage value of a first target voltage, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is larger than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit.

In some embodiments, according to an actual application scenario, the user terminal may also send a first control instruction to the communication circuit 171 at any time, and the processing unit 120 may obtain the first control instruction according to the communication circuit 171, and may detect whether the voltage value of the first target voltage is greater than a preset voltage threshold according to the first control instruction, and if so, may output a first control signal to the switching circuit according to the foregoing related content, and obtain a first output current parameter of the current transformer through the measurement circuit. By applying the embodiment of the application, the user terminal can actively request to acquire the first output current parameter of the current transformer according to the actual application scene, and the applicability of the circuit breaker can be improved.

It should be noted that, the specific circuit configuration diagrams of the processing unit, the power supply circuit, the measurement circuit, the switching circuit, the auxiliary power supply circuit, and the load circuit are not limited herein, and the specific arrangement mode is based on the principle of implementing the functions of each circuit.

Alternatively, the current transformer 110 includes a core transformer. Of course, it should be noted that the current transformer may be any current transformer having the same working principle as the core transformer, which is not limited herein, and may be different according to actual application scenarios.

Optionally, this application embodiment still provides a circuit breaker, this circuit breaker can include circuit breaker body and above-mentioned measuring device, and this measuring device can set up in circuit breaker is internal, uses this application embodiment, can supply power for processing unit through auxiliary power circuit, avoids processing unit power variation to current transformer output current's influence, so can guarantee that measuring circuit work under a invariable operating mode, and then can improve the measurement accuracy of transformer current in the circuit breaker, improves measuring result's accuracy.

Fig. 5 is a schematic flow chart of a measurement method according to an embodiment of the present application, where the measurement method may be applied to the processing unit in the measurement device, and optionally, as shown in fig. 5, the measurement method may include:

s101, detecting a voltage value of a first target voltage, and outputting a first control signal to a switching circuit if the voltage value of the first target voltage is determined to be larger than a preset voltage threshold.

The first control signal is used for switching the switching circuit into a conducting state to discharge the output current of the current transformer.

S102, acquiring a first output current parameter of the current transformer through a measuring circuit.

Referring to the related content of the foregoing measurement apparatus, the processing unit may not only supply power based on the second power supply terminal, but also measure the voltage value of the first target voltage based on the second power supply terminal, where if it is determined that the voltage value of the first target voltage is greater than the preset voltage threshold, it is indicated that the converted first target voltage of the auxiliary power supply circuit may completely meet the power supply requirement of the processing unit, and in this case, the processing unit may be powered only by the auxiliary power supply circuit, so as to avoid the influence of the power change of the processing unit on the output current of the current transformer, so that the measurement circuit may be ensured to operate under a constant working condition, and further, the measurement accuracy of the measurement circuit may be improved, and the accuracy of the measurement result may be improved.

Optionally, the method further comprises:

and detecting the voltage value of the first target voltage, and if the voltage value of the first target voltage is smaller than the preset voltage threshold value, outputting a second control signal to the switching circuit so that the switching circuit is switched from the on state to the off state according to the second control signal, and supplying power to the processing unit through the power supply circuit.

If it is determined that the voltage value of the first target voltage is smaller than the preset voltage threshold, it is indicated that the first target voltage converted by the auxiliary power supply circuit cannot meet the power supply requirement of the processing unit alone, then a second control signal can be output to the switch circuit, the second switch circuit can be switched from a conducting state to a disconnecting state according to the second control signal, based on the foregoing description, it can be understood that in the disconnecting state, the power supply circuit can convert the output current of the current transformer to obtain the second target voltage and supply power to the processing unit, and it can be seen that the processing unit can be powered by the first target voltage and the second target voltage at this time, so that the phenomenon of insufficient power supply of the processing unit is avoided, and the applicability of the method is improved.

Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application, where the electronic device may be integrated into a circuit breaker. As shown in fig. 6, the electronic device may include: processor 210, storage medium 220, and bus 230, storage medium 220 storing machine-readable instructions executable by processor 210, processor 210 executing machine-readable instructions to perform steps of the method embodiments described above when the electronic device is operating, processor 210 communicating with storage medium 220 via bus 230. The specific implementation manner and the technical effect are similar, and are not repeated here.

Optionally, the present application further provides a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method embodiments. The specific implementation manner and the technical effect are similar, and are not repeated here.

The above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASICs), or one or more microprocessors, or one or more field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGAs), etc. For another example, when a module above is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke the program code. For another example, the modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (13)

1. The measuring device is characterized by comprising a current transformer, a processing unit, a power supply circuit, a measuring circuit, a switching circuit and an auxiliary power supply circuit, wherein the auxiliary power supply circuit supplies power through the main circuit voltage of a circuit breaker;

one end of the current transformer is electrically connected with one end of the switching circuit, the other end of the switching circuit is electrically connected with one end of the power supply circuit, and a first output end of the power supply circuit is electrically connected with a first power supply end of the processing unit;

the other end of the current transformer is electrically connected with one end of the measuring circuit, the first control end of the processing unit is electrically connected with the control end of the switching circuit, and the first measuring end of the processing unit is electrically connected with the other end of the measuring circuit;

the first power supply output end of the auxiliary power supply circuit is electrically connected with the second power supply end of the processing unit, and the auxiliary power supply circuit is used for converting the main loop voltage into a first target voltage and supplying power to the processing unit through the first target voltage;

the power supply circuit is used for converting the output current of the current transformer when the switch circuit is in an off state, obtaining a second target voltage and supplying power to the processing unit;

the processing unit is used for detecting the voltage value of the first target voltage based on the second power supply end, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is determined to be greater than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit;

the switching circuit is used for switching to a conducting state according to the first control signal so as to discharge the output current of the current transformer.

2. The measurement device of claim 1, wherein the processing unit is further configured to detect a voltage value of the first target voltage, and output a second control signal to the switching circuit if it is determined that the voltage value of the first target voltage is less than a preset voltage threshold;

the switching circuit is further configured to switch from the on state to the off state according to the second control signal, so that power is supplied to the processing unit through the power supply circuit.

3. The measurement device of claim 2, wherein the second control signal is a pulse width modulated signal; the processing unit is specifically configured to obtain a second output current parameter of the current transformer through the measurement circuit, and determine a target duty cycle of the pulse width modulation signal according to the second output current parameter and a preset duty cycle mapping relationship; and determining the second control signal according to the target duty ratio of the pulse width modulation signal.

4. The measurement device of claim 2, wherein the measurement device further comprises: the current transformer is connected with one end of the switch circuit, and the other end of the switch circuit is connected with the other end of the current transformer;

the rectification circuit is used for converting the alternating current signal output by the current transformer into a direct current signal.

5. The measurement device of claim 1, wherein the measurement device further comprises: the first power end of the load circuit is electrically connected with the second output end of the power circuit, the second power end of the load circuit is electrically connected with the second power supply output end of the auxiliary power circuit, and the control end of the load circuit is electrically connected with the second control end of the processing unit;

the power supply circuit is further used for converting the output current of the current transformer when the switching circuit is in an off state, obtaining a third target voltage and supplying power to the load circuit;

the auxiliary power supply circuit is further configured to convert the main loop voltage into a fourth target voltage, and supply power to the load circuit through the fourth target voltage.

6. The measurement device of claim 5, wherein the load circuit comprises: a communication circuit;

the processing unit is further configured to send the first output current parameter to a user terminal through the communication circuit.

7. The measurement device of claim 5, wherein the load circuit further comprises: an alarm circuit;

the processing unit is further configured to output a first alarm signal through the alarm circuit if the first output current parameter does not meet a preset requirement.

8. The measurement device of claim 6, wherein the processing unit is further configured to generate a second alert signal if the first output current parameter does not meet a preset requirement, and send the second alert signal to a user terminal through the communication circuit.

9. The measurement device of claim 1, wherein the switching circuit comprises: at least one of metal oxide semiconductor field effect transistor and semiconductor triode.

10. The measurement device according to claim 6, wherein the processing unit is specifically configured to obtain, through the communication circuit, a first control instruction sent by a user terminal; and detecting the voltage value of the first target voltage according to the first control instruction, outputting a first control signal to the switching circuit if the voltage value of the first target voltage is larger than a preset voltage threshold value, and acquiring a first output current parameter of the current transformer through the measuring circuit.

11. The measurement device of any one of claims 1-10, wherein the current transformer comprises a core transformer.

12. A circuit breaker comprising a circuit breaker body and a measuring device according to any of claims 1-11, said measuring device being arranged in said circuit breaker body.

13. A measuring method, characterized by a processing unit applied in a measuring device according to any of claims 1-11, the method comprising:

detecting a voltage value of a first target voltage, and outputting a first control signal to a switching circuit if the voltage value of the first target voltage is determined to be larger than a preset voltage threshold, wherein the first control signal is used for switching the switching circuit into a conducting state so as to drain the output current of the current transformer;

a first output current parameter of the current transformer is obtained through a measuring circuit.