CN217213109U - Abnormity detection circuit and intelligent electric energy meter - Google Patents
Abnormity detection circuit and intelligent electric energy meter Download PDFInfo
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- CN217213109U CN217213109U CN202122019712.6U CN202122019712U CN217213109U CN 217213109 U CN217213109 U CN 217213109U CN 202122019712 U CN202122019712 U CN 202122019712U CN 217213109 U CN217213109 U CN 217213109U
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Abstract
The application discloses anomaly detection circuit and intelligent ammeter relates to electronic design technical field. In an embodiment of the present application, the abnormality detection circuit includes: the power supply circuit is connected with the control circuit sequentially through the voltage amplification circuit and the voltage identification circuit, and the control circuit is connected with the power supply circuit through the switch circuit. The intelligent electric energy meter fault detection method and device can accurately and timely detect the abnormal faults of the intelligent electric energy meter, and then the running state of the power circuit is controlled through the switch circuit, so that the intelligent electric energy meter is guaranteed to work stably.
Description
Technical Field
The utility model relates to an electronic design technical field especially relates to an anomaly detection circuit and intelligent ammeter.
Background
The power consumer electricity consumption information acquisition system is a system for acquiring, processing and monitoring electricity consumption information of power consumers in real time, and realizes automatic acquisition, abnormal metering, electric energy quality monitoring, electricity consumption analysis and management of the electricity consumption information. With the deep construction of the electricity consumption information acquisition system, more requirements are put forward on the non-metering function in the system, for example, when the line is overloaded, the line may be burnt, and abnormal detection needs to be carried out on the conditions of line overload and the like. In addition, when a single user or multiple users in a certain area have power failure due to electric energy meter failure, the power failure information needs to be acquired in time.
In order to keep the work stability of the electric energy meter in the daily practical process in the prior art, the accurate detection is usually needed, including the detection of current, voltage and the like, so as to monitor whether the electric energy meter breaks down or not and check the fault. Therefore, during the operation of the electric energy meter, a corresponding abnormality detection circuit is usually configured to detect the operation state of the electric energy meter.
SUMMERY OF THE UTILITY MODEL
The application provides an anomaly detection circuit and an intelligent electric energy meter, which can solve the technical problem that the anomaly fault of the intelligent electric energy meter cannot be accurately and timely determined in the prior art.
In a first aspect, an embodiment of the present application provides an abnormality detection circuit, where the abnormality detection circuit includes:
the power supply circuit is connected with the control circuit sequentially through the voltage amplification circuit and the voltage identification circuit, and the control circuit is connected with the power supply circuit through the switch circuit;
the power supply circuit is used for providing a voltage input signal;
the voltage amplifying circuit is used for converting the voltage input signal into a voltage output signal after at least two times of voltage amplification and sending the voltage output signal to the voltage identification circuit, wherein the voltage value of the voltage output signal is greater than that of the voltage input signal;
the voltage identification circuit is used for outputting a level signal corresponding to the voltage output signal after receiving the voltage output signal and sending the level signal to the control circuit;
the control circuit is used for receiving the level signal and outputting a control signal when the level signal is a preset level signal, and the control signal is used for controlling the switch circuit to be switched off so as to stop the power supply circuit from running.
In one or more possible embodiments, the voltage amplification circuit includes:
the circuit comprises a first amplifying circuit, a second amplifying circuit and a voltage stabilizing circuit;
the first amplification circuit includes: the circuit comprises a first resistor, a first capacitor and a first operational amplifier;
the second amplification circuit includes: the circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a voltage source and a second operational amplifier;
the voltage stabilizing circuit comprises: a second capacitor and a first diode.
In one or more possible embodiments, the output terminal of the power supply circuit is respectively connected to the first resistor, the first capacitor, and the positive input terminal of the first operational amplifier, the negative input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and the other terminal of the first resistor and the other terminal of the first capacitor are grounded.
In one or more possible embodiments, the negative input terminal of the second operational amplifier is connected to the voltage source through the second resistor, the positive input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier through the third resistor, one end of the fourth resistor is connected to the positive input terminal of the second operational amplifier, the other end of the fourth resistor is grounded, one end of the fifth resistor is connected to the negative input terminal of the second operational amplifier, and the other end of the fifth resistor is connected to the output terminal of the second operational amplifier.
In one or more possible embodiments, the second capacitor is connected to the output terminal of the second operational amplifier and the first diode, and the second capacitor is connected to the other end of the first diode and grounded.
In one or more possible embodiments, the voltage identification circuit includes: the circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, an optocoupler and a second diode.
In one or more possible embodiments, one end of the sixth resistor is connected to the output end of the voltage amplifying circuit, the other end of the sixth resistor is connected to the negative electrode of the second diode and the positive electrode end of the light emitting diode of the optocoupler through the seventh resistor, one end of the eighth resistor is connected to the output end of the power supply circuit, and the other end of the eighth resistor is connected to the positive electrode of the second diode and the negative electrode end of the light emitting diode of the optocoupler through the ninth resistor; and the collector of the triode of the optocoupler is connected with the tenth resistor and the third capacitor, the emitter of the triode of the optocoupler is grounded with the other end of the third capacitor, and the other end of the tenth resistor is connected with the control circuit.
In one or more possible embodiments, the switching circuit includes: the MOS transistor comprises a first MOS transistor, a third diode, an eleventh resistor and a twelfth resistor.
In one or more possible embodiments, one end of the eleventh resistor is connected to the control circuit, the other end of the eleventh resistor is connected to the gate of the first MOS transistor and the first end of the twelfth resistor, respectively, the other end of the twelfth resistor, the source of the first MOS transistor, and the anode of the third diode are grounded, and the drain of the first MOS transistor and the cathode of the third diode are connected to the power supply circuit.
In a second aspect, an embodiment of the present application provides an intelligent electric energy meter, where the intelligent electric energy meter includes the abnormality detection circuit in any one of the above embodiments.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
this application is through being provided with circuits such as power supply circuit, voltage amplification circuit, voltage identification circuit, control circuit and switch electric power, voltage amplification circuit be used for with voltage input signal converts voltage output signal into after two voltage amplification at least, and will voltage output signal sends to voltage identification circuit, voltage identification circuit are used for receiving behind the voltage output signal, export the level signal that voltage output signal corresponds, and will level signal sends and sends control circuit, control circuit are used for receiving level signal, and output control signal when level signal is for predetermineeing level signal, control signal is used for control switch circuit disconnection is so that power supply circuit stop operation. The intelligent electric energy meter fault detection method and device can accurately and timely detect the abnormal faults of the intelligent electric energy meter, and then the running state of the power circuit is controlled through the switch circuit, so that the intelligent electric energy meter is guaranteed to work stably.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an anomaly detection circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a voltage amplifying circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a voltage identification circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a switching circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the features and advantages of the present application more obvious and understandable, the technical solutions in 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 only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of circuits and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In the description of the embodiments of the present application, it is to be understood that "a plurality" means two or more unless otherwise specified in the description of the present application. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Fig. 1 shows a schematic structural diagram of an abnormality detection circuit according to an embodiment of the present application. In an embodiment of the present application, an abnormality detection circuit includes: a power supply circuit 101, a voltage amplification circuit 102, a voltage identification circuit 103, a control circuit 104, and a switch circuit 105. The power supply circuit 101 is connected to the control circuit 104 sequentially through the voltage amplifying circuit 102 and the voltage identifying circuit 103, and the control circuit 104 is connected to the power supply circuit 101 through the switch circuit 105.
A power supply circuit 101 for supplying a voltage input signal in the abnormality detection circuit, and supplying power to the control circuit 104, and the like. In a possible embodiment, the power circuit may refer to ac power from a power plant, and the power circuit supplies power to a user through an intelligent electric energy meter, and the intelligent electric energy meter is used for metering electric energy used by the user and the like. The power supply circuit may refer to a circuit design of a power supply part for supplying power to the electric device, and a used circuit form and characteristics may include an ac power supply and a dc power supply, and the application does not specifically limit the kind and form of the power supply circuit.
The voltage amplifying circuit 102 is configured to convert the voltage input signal into a voltage output signal after at least two voltage amplifications, and send the voltage output signal to the voltage identification circuit, where a voltage value of the voltage output signal is greater than a voltage value of the voltage input signal. A circuit capable of amplifying a weak signal is called an amplification circuit or an amplifier, and the amplifier includes an ac amplifier, a dc amplifier, and the like, and the ac amplifier may be divided into a low frequency, an intermediate frequency, and a high frequency by frequency. The received output signal may be divided into voltage amplification, power amplification, and the like, and an amplifier using an integrated operational amplifier and a special transistor as a device may be used.
And the voltage identification circuit 103 is used for outputting a level signal corresponding to the voltage output signal after receiving the voltage output signal and sending the level signal to the control circuit. The voltage identification circuit may identify the voltage level by converting input signals of different conditions (such as, but not limited to, leakage, overload, power down, etc.) to corresponding level signals, such as: the voltage discrimination circuit may output a high level signal if the power supply voltage is in a leakage condition, a low level signal if the power supply voltage is in an overload condition, and the like.
And the control circuit 104 is configured to receive the level signal and output a control signal when the level signal is a preset level signal, where the control signal is used to control the switch circuit to be turned off so that the power supply circuit stops operating. In a possible embodiment the control electronics may carry a battery backup, by means of which power failure anomalies or the like can be detected when the power supply circuit is open. The control circuit may include one or more processing cores, which are connected to various portions of the overall control circuit using various interfaces and lines, and which perform various functions and process data set in advance by executing or executing instructions, programs, code sets, or instruction sets stored in the control circuit and calling data stored in a memory in the control circuit. Optionally, the control circuit may be implemented in at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA).
A switch circuit 105 for controlling the stop operation of the power supply circuit when the power supply circuit is operating normally. The switching circuit may include one or more of: the single-pole single-throw switch, the MOS tube, the photosensitive diode and the like can change the communication state of the switch circuit and the like by receiving a control signal of the control circuit.
In this embodiment, the voltage amplifying circuit 102 obtains the voltage output signal by amplifying the voltage input signal provided from the power circuit 101 for the abnormality detecting circuit, for example: the voltage amplification circuit 102 may convert the voltage input signal of 0-1.25V to the voltage output signal of 5-10V. Then, the voltage output signal is sent to the voltage identification circuit 103, and the voltage identification circuit 103 outputs a level signal corresponding to the voltage output signal, for example: when the power supply circuit 101 outputs an abnormal voltage, the voltage identification circuit 103 outputs a high level signal. Then, the level signal is sent to the control circuit 104, the control circuit 104 may determine whether the level signal is a preset level signal, if the level signal is the preset level signal, the control circuit 104 may output a control signal, and the control signal may cause the switch circuit 105 to control the power circuit 101 to stop operating when the power circuit 101 operates normally. For example: the control circuit 104 receives that the level signal is a high level signal, and the preset level signal is a high level signal, then the control circuit 104 may output a low level control signal to the switch circuit 105, and if the switch circuit 105 receives the low level control signal, the switch circuit 105 may control the power circuit 101 to stop operating through a switch and other components.
For example, if the normal operating voltage of the power circuit 101 is 10V, if the voltage input signal provided by the power circuit 101 is 12V, the voltage amplification circuit 102 may convert the voltage input signal of 12V into the voltage output signal of 35V, then, the voltage identification circuit 103 determines that the level signal corresponding to the voltage input signal of 35V is a high level signal 1, transmits the high level signal 1 to the control circuit 104, the preset level signal of the control circuit 104 is a high level signal 1, the control circuit 104 may output a control signal of a low level 0 to the switch circuit 105, after the switch circuit 105 receives the control signal of low level 0 from the control circuit 104, the power supply circuit 101 may be controlled to be open, and the operation of the power supply circuit 101 may be controlled to be stopped.
This application is through being provided with circuits such as power supply circuit, voltage amplification circuit, voltage identification circuit, control circuit and switching power, voltage amplification circuit be used for with voltage input signal converts voltage output signal into after two voltage amplification at least, and will voltage output signal sends and gives voltage identification circuit, voltage identification circuit are used for receiving behind the voltage output signal, the output level signal that voltage output signal corresponds, and will level signal sends and gives control circuit, control circuit are used for receiving level signal, and level signal exports control signal when for predetermineeing level signal, control signal is used for control switching circuit disconnection is so that power supply circuit stops to operate. The intelligent electric energy meter fault detection method and device can accurately and timely detect the abnormal faults of the intelligent electric energy meter, and then the running state of the power circuit is controlled through the switch circuit, so that the intelligent electric energy meter is guaranteed to work stably.
Fig. 2 is a schematic structural diagram of a voltage amplifying circuit according to an embodiment of the present disclosure. In an embodiment of the present application, the voltage amplifying circuit includes: a first amplifying circuit 1021, a second amplifying circuit 1022 and a voltage stabilizing circuit 1023; the first amplification circuit 1021 includes: a first resistor R1, a first capacitor C1 and a first operational amplifier F1; the second amplifying circuit 1022 includes: a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a voltage source V and a second operational amplifier F2; the voltage stabilizing circuit 1023 includes: a second capacitor C2 and a first diode D1.
The following is the connection relationship between the elements in the voltage amplifying circuit in the embodiment of the present application:
the output end of the power supply circuit is respectively connected with the positive input ends of the first resistor R1, the first capacitor C1 and the first operational amplifier F1, the negative input end of the first operational amplifier F1 is connected with the output end of the first operational amplifier F1, and the other end of the first resistor R1 and the other end of the first capacitor C1 are grounded. The negative pole input end of second operational amplifier F2 passes through second resistance R2 with voltage source V connects, the positive input end of second operational amplifier F2 passes through third resistance R3 with the output of first operational amplifier F1 is connected, the one end of fourth resistance R4 with the positive input end of second operational amplifier F2 is connected, and the other end ground connection, the one end of fifth resistance R5 with the negative pole input end of second operational amplifier F2 is connected, the other end with the output of second operational amplifier F2 is connected. The second capacitor C2 is connected to the output terminal of the second operational amplifier F2 and the first diode D1, and the other end of the second capacitor C2 and the first diode D1 is grounded.
The following is the working principle of the voltage amplifying circuit provided by the embodiment of the application:
the first amplification circuit 1021 and the second amplification circuit 1022 are configured to amplify a voltage input signal from the power circuit to obtain a voltage output signal, where a voltage value of the voltage output signal is greater than a voltage value of the voltage input signal. The voltage stabilizing circuit 1023 is used for stabilizing the voltage of the voltage signal output by the second amplifying circuit 1022, so as to ensure the stability of the voltage signal.
The voltage output signal from the power circuit may enter the first operational amplifier F1 after being filtered by the filter combined by the first resistor R1 and the first capacitor C1, so as to effectively increase the input impedance and reduce the output impedance, and at the same time, the first amplifying circuit 1021 may play a good role in isolation, but may not change the signal amplitude of the voltage output signal, and the voltage amplifying circuit may also be referred to as an in-phase proportional amplifying circuit, where the input terminal of the first amplifying circuit 1021 may be the voltage input signal collected by the power circuit through the sensor. For example: the first amplification circuit 1021 may convert a voltage signal of 0-1V into an in-phase voltage signal of 1-5V.
The voltage signal may then pass through the second amplifying circuit 1022, and the second amplifying circuit 1022 may amplify the voltage signal for a second time. For example: the second amplifying circuit 1022 may convert a voltage signal of 0-10V into a voltage signal of 12.5-25V, convert a voltage signal of-10-0V into a voltage signal of 0-1.25V, and so on. For example: when the first resistor R1 is 0.5 kohm, the second resistor R2 and the third resistor R3 are 12 kohm, the fourth resistor R4 and the fifth resistor are 1.5 kohm, the first capacitor C1 and the second capacitor C2 are 0.1 μ, and the first diode D1 is 3.0V, and the voltage source is-10V, the second amplifying circuit 1022 may convert a voltage signal of 0-10V into 1.25-2.5V, or convert a voltage signal of-10-0V into a voltage signal of 0-1.25V. The second amplifying circuit 1022 can accurately amplify the voltage signal, thereby ensuring the stability of the voltage signal.
Then, the voltage stabilizing circuit 1023 can obtain a stable voltage output signal after the voltage stabilizing processing is performed on the voltage signal by the voltage stabilizer combined by the second capacitor C2 and the first diode D1, and finally the stable voltage output signal can be sent to the voltage identification circuit, so that the voltage identification circuit can be damaged by spike voltage signals accidentally occurring on the skin surface, wherein the first capacitor C1 and the second capacitor C2 can be filter capacitors, and the first diode D1 can be a zener diode.
Fig. 3 is a schematic structural diagram of a voltage identification circuit according to an embodiment of the present disclosure. In an embodiment of the present application, the voltage identification circuit includes: the LED driving circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, an optical coupler O1 and a second diode D2.
The following is the connection relationship between the elements in the voltage identification circuit in the embodiment of the present application:
one end of the sixth resistor R6 is connected to the output end of the voltage amplifying circuit, the other end of the sixth resistor R6 is connected to the negative electrode of the second diode D2 and the positive electrode of the light emitting diode VD of the optocoupler O1 through the seventh resistor R7, one end of the eighth resistor R8 is connected to the output end of the power supply circuit, and the other end of the eighth resistor R8 is connected to the positive electrode of the second diode D2 and the negative electrode of the light emitting diode VD of the optocoupler O1 through the ninth resistor R9; the collector of the triode Q1 of the optocoupler O1 is connected with the tenth resistor R10 and the third capacitor C3, the emitter of the triode Q1 of the optocoupler O1 is grounded with the other end of the third capacitor C3, and the other end of the tenth resistor R10 is connected with the control circuit.
The following is the working principle of the voltage identification circuit provided by the embodiment of the application:
in the voltage identification circuit, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are right after the voltage output signal output by the voltage amplification circuit is subjected to current limiting, rectification processing can be performed through a second diode D2, the rectified voltage output signal is subjected to isolation control through an optical coupler O1 input end, the output end of the optical coupler O1 performs high-low level detection through a detection signal of the input end, namely, the output end of the optical coupler O1 detects the high-low level on a detection port of the power circuit. For example: the detection when the internal power supply of the intelligent electric energy meter is abnormal is as follows: when the internal power supply of the intelligent electric energy meter is abnormal under the condition of a mains supply, the standby battery of the intelligent electric energy meter works, the detection port of the power circuit outputs a high level and a low level, the output end of the optocoupler 01 is conducted, the detection port of the control circuit is pulled to be a low level, and the internal power supply of the intelligent electric energy meter is judged to be abnormal by the intelligent electric energy meter. Detection when the power supply line is powered off: when no signal is input at the input end of the optical coupler O1 (no commercial power is supplied), the output end of the optical coupler 01 is cut off, the detection port of the control circuit is pulled to be at a high level, and the intelligent electric energy meter judges that a power supply line in the power circuit is powered off and the like. In one possible embodiment, P1 may refer to ac power line access port through the voltage amplifying circuit, P2 may refer to ac neutral access port through the voltage amplifying circuit, and the like.
Fig. 4 is a schematic structural diagram of a switching circuit according to an embodiment of the present disclosure. In an embodiment of the present application, the switching circuit includes: the circuit comprises a first MOS transistor M1, a third diode D3, an eleventh resistor R11 and a twelfth resistor R12.
The following is the connection relationship between the elements in the switch circuit in this embodiment:
one end of the eleventh resistor R11 is connected to the control circuit, the other end of the eleventh resistor R11 is connected to the gate of the first MOS transistor M1 and the first end of the twelfth resistor R12, respectively, the other end of the twelfth resistor R12, the source of the first MOS transistor M1 and the anode of the third diode D3 are grounded, and the drain of the first MOS transistor M1 and the cathode of the third diode D3 are connected to the power circuit.
The following is the working principle of the switching circuit provided by the embodiment of the application:
the switching circuit may be understood as a switching module that switches between an off state and an on state based on a control method such as an instruction, a signaling, or the like of a control circuit. For example: the switching circuit may include one or more of: single-pole single-throw switch, MOS tube, photosensitive diode, etc. When the switching circuit is in a conducting state, a loop is formed through a power supply circuit of the intelligent electric energy meter, and the power supply voltage normally supplies power to the intelligent electric energy meter; when the switching circuit is in a disconnected state, the power supply circuit of the intelligent electric energy meter is disconnected, the power supply voltage stops supplying power to the intelligent electric energy meter, and the intelligent electric energy meter is protected so as to avoid damage of the intelligent electric energy meter and the like. For example: the control signal may be a pulse current, and when the control signal is output when the level signal is analyzed to be a preset level signal, the pulse current is sent to the switching circuit to control the switching circuit to be switched to the off state.
This application is through being provided with circuits such as power supply circuit, voltage amplification circuit, voltage identification circuit, control circuit and switch electric power, voltage amplification circuit be used for with voltage input signal converts voltage output signal into after two voltage amplification at least, and will voltage output signal sends to voltage identification circuit, voltage identification circuit are used for receiving behind the voltage output signal, export the level signal that voltage output signal corresponds, and will level signal sends and sends control circuit, control circuit are used for receiving level signal, and output control signal when level signal is for predetermineeing level signal, control signal is used for control switch circuit disconnection is so that power supply circuit stop operation. The intelligent electric energy meter fault detection method and device can accurately and timely detect the abnormal faults of the intelligent electric energy meter, and then the running state of the power circuit is controlled through the switch circuit, so that the intelligent electric energy meter is guaranteed to work stably.
The embodiment of the present application further provides an intelligent electric energy meter, which includes any one of the abnormality detection circuits in the above embodiments, and the working principle of the abnormality detection circuit in the present application can refer to the above embodiments, which is not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In view of the above description of the anomaly detection circuit and the intelligent electric energy meter provided by the present application, those skilled in the art will recognize that there are variations in the embodiments and applications of the present application.
Claims (10)
1. An abnormality detection circuit, characterized in that the abnormality detection circuit comprises:
the power supply circuit is connected with the control circuit sequentially through the voltage amplification circuit and the voltage identification circuit, and the control circuit is connected with the power supply circuit through the switch circuit;
the power supply circuit is used for providing a voltage input signal;
the voltage amplifying circuit is used for converting the voltage input signal into a voltage output signal after at least two times of voltage amplification and sending the voltage output signal to the voltage identification circuit, wherein the voltage value of the voltage output signal is greater than that of the voltage input signal;
the voltage identification circuit is used for outputting a level signal corresponding to the voltage output signal after receiving the voltage output signal and sending the level signal to the control circuit;
the control circuit is used for receiving the level signal and outputting a control signal when the level signal is a preset level signal, wherein the control signal is used for controlling the switch circuit to be switched off so as to stop the power supply circuit.
2. The abnormality detection circuit according to claim 1, characterized in that the voltage amplification circuit includes:
the circuit comprises a first amplifying circuit, a second amplifying circuit and a voltage stabilizing circuit;
the first amplification circuit includes: the circuit comprises a first resistor, a first capacitor and a first operational amplifier;
the second amplification circuit includes: the circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a voltage source and a second operational amplifier;
the voltage stabilizing circuit includes: a second capacitor and a first diode.
3. The abnormality detection circuit according to claim 2, wherein an output terminal of said power supply circuit is connected to said first resistor, said first capacitor, and a positive input terminal of said first operational amplifier, respectively, a negative input terminal of said first operational amplifier is connected to an output terminal of said first operational amplifier, and the other terminal of said first resistor and the other terminal of said first capacitor are grounded.
4. The abnormality detection circuit according to claim 3, wherein a negative input terminal of said second operational amplifier is connected to said voltage source via said second resistor, a positive input terminal of said second operational amplifier is connected to an output terminal of said first operational amplifier via said third resistor, one end of said fourth resistor is connected to a positive input terminal of said second operational amplifier, and the other end thereof is grounded, one end of said fifth resistor is connected to a negative input terminal of said second operational amplifier, and the other end thereof is connected to an output terminal of said second operational amplifier.
5. The abnormality detection circuit according to claim 4, wherein said second capacitor is connected to an output terminal of said second operational amplifier and said first diode, and said second capacitor is grounded to the other end of said first diode.
6. The abnormality detection circuit according to claim 1, characterized in that the voltage identification circuit includes: the circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, an optocoupler and a second diode.
7. The abnormality detection circuit according to claim 6, wherein one end of said sixth resistor is connected to an output terminal of said voltage amplification circuit, the other end of said sixth resistor is connected to a negative electrode of said second diode and a positive electrode terminal of said light emitting diode of said opto-coupler via said seventh resistor, one end of said eighth resistor is connected to an output terminal of said power supply circuit, and the other end of said eighth resistor is connected to a positive electrode of said second diode and a negative electrode terminal of said light emitting diode of said opto-coupler via said ninth resistor;
and a collector of a triode of the optocoupler is connected with the tenth resistor and the third capacitor, an emitter of the triode of the optocoupler is grounded with the other end of the third capacitor, and the other end of the tenth resistor is connected with the control circuit.
8. The abnormality detection circuit according to claim 1, characterized in that the switch circuit includes: the MOS transistor comprises a first MOS transistor, a third diode, an eleventh resistor and a twelfth resistor.
9. The abnormality detection circuit according to claim 8, wherein one end of said eleventh resistor is connected to said control circuit, the other end of said eleventh resistor is connected to the gate of said first MOS transistor and the first end of said twelfth resistor, respectively, the other end of said twelfth resistor, the source of said first MOS transistor and the anode of said third diode are grounded, and the drain of said first MOS transistor and the cathode of said third diode are connected to said power supply circuit.
10. An intelligent electric energy meter, characterized in that the intelligent electric energy meter comprises an abnormality detection circuit according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117949718A (en) * | 2024-03-25 | 2024-04-30 | 杭州海康威视数字技术股份有限公司 | Voltage detection system, method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949718A (en) * | 2024-03-25 | 2024-04-30 | 杭州海康威视数字技术股份有限公司 | Voltage detection system, method and device |
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