Circuit breaker

Abstract

The invention discloses a circuit breaker, and relates to the field of circuit break protection, in the scheme, the circuit breaker comprises a main control module, an acquisition module, a gate position operation module and a control line module, the acquisition module can acquire the current voltage and current of a power grid, and the control line module can receive a control signal transmitted by an electric energy meter through a control line; and a corresponding voltage protection threshold and / or current protection threshold are / is decoded, so that the main control module correspondingly controls whether the brake position operation module carries out opening operation or not according to the voltage protection threshold and / or current protection threshold and the current voltage and current of the power grid. According to the scheme, the voltage protection threshold value and / or the current protection threshold value of the circuit breaker can be flexibly adjusted according to the control signal transmitted by the electric energy meter, so that opening and closing of the brake position operation module are controlled to adapt to various application environments.

Description

Technical Field

[0001] The invention relates to the field of circuit breaker protection, and in particular to a circuit breaker. Background Art

[0002] As a terminal device of the power grid, the electric energy meter has now fully entered our lives. The external circuit breaker is a key component that cooperates with the electric energy meter to realize protection, fee control and other functions. However, in the existing external circuit breaker solution, the circuit breaker can only perform corresponding opening and closing operations according to the rated protection voltage and rated protection current. The protection voltage and protection current cannot be flexibly set according to the usage scenario, that is, the substation where the electric energy meter is located, resulting in fewer application scenarios for the circuit breaker. Summary of the invention

[0003] The object of the present invention is to provide a circuit breaker, which can flexibly adjust the voltage protection threshold and / or current protection threshold of the circuit breaker according to the control signal transmitted by the electric energy meter, and then control the opening and closing of the gate position operation module to adapt to various application environments.

[0004] In order to solve the above technical problems, the present invention provides a circuit breaker, comprising: a main control module, a collection module, a gate position operation module, and a control line module;

[0005] The input end of the acquisition module is connected to the power grid, and the output end is connected to the first input end of the main control module, and is used to collect the current voltage and current of the power grid;

[0006] The input end of the gate position operation module is connected to the power grid, the output end is connected to the load, and the control end is connected to the first output end of the main control module;

[0007] The input end of the control line module is connected to the output end of the electric energy meter through the control line, and the output end is connected to the second input end of the main control module, and is used to decode the control signal transmitted by the electric energy meter into a corresponding voltage protection threshold and / or current protection threshold;

[0008] The main control module is used to control whether the gate position operation module performs a gate opening operation based on the voltage protection threshold and the current voltage and / or the current protection threshold and the current current.

[0009] Optionally, the control line module includes: a control line interface and decoding module;

[0010] The input end of the control line interface is connected to the output end of the electric energy meter through the control line, and the output end is connected to the input end of the decoding module, and is used to receive the control signal transmitted by the electric energy meter through the control line;

[0011] The output end of the decoding module is connected to the second input end of the main control module, and is used to decode the control signal into a corresponding voltage protection threshold and / or current protection threshold.

[0012] Optionally, also include:

[0013] A feedback line module, wherein the input end of the feedback line module is connected to the second output end of the main control module, and the output end is connected to the input end of the electric energy meter through a feedback line, and is used to encrypt the opening and closing status of the gate position operation module transmitted by the main control module into a feedback signal and transmit it to the electric energy meter.

[0014] Optionally, the feedback line module includes: a feedback line interface and an encryption module;

[0015] The input end of the encryption module is connected to the second output end of the main control module, and is used to encrypt the opening and closing conditions of the gate position operation module transmitted by the main control module into the feedback signal;

[0016] The feedback line interface is connected to the input end of the electric energy meter through the feedback line, and is used to transmit the feedback signal to the electric energy meter through the feedback line.

[0017] Optionally, the electric energy meter includes: a zero-crossing detection circuit, a processor, a switch control circuit, and a voltage acquisition circuit;

[0018] The input end of the zero-crossing detection circuit is connected to the power grid, and the output end is connected to the input end of the processor, and is used to send a positive half-cycle zero-crossing point trigger signal and a negative half-cycle zero-crossing point trigger signal to the processor respectively when a positive half-cycle zero-crossing point and a negative half-cycle zero-crossing point of the AC signal of the power grid are detected;

[0019] The output end of the processor is connected to the control end of the switch control circuit, and is used to control the switch control circuit to be turned on and off based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, so as to transmit the control signal to the circuit breaker through the switch control circuit and the control line, and determine the opening and closing status of the gate position operation module according to the feedback signal;

[0020] The output end of the switch control circuit is connected to the control line;

[0021] The voltage collection circuit is connected to the feedback line and is used to receive the feedback signal.

[0022] Optionally, the processor is specifically configured to:

[0023] Control the switch control circuit to start within a preset period, and transmit N preset start signals to the control line, wherein the preset start signal is a voltage signal having two positive half cycles within a unit period, and N is a positive integer not less than 1;

[0024] When the positive half-cycle zero-crossing trigger signal is received, the switch control circuit is controlled to be turned on, so that the switch control module outputs a positive half-cycle AC signal;

[0025] When the negative half-cycle zero-crossing trigger signal is received, the switch control circuit is controlled to be turned on or off. If the switch control circuit is controlled to be turned off, the output end of the switch control circuit is controlled to be connected to the ground line, so that the negative half-cycle amplitude of the positive half-cycle AC signal is zero; if the switch control circuit is controlled to be turned on, the output end of the switch control circuit is controlled to be connected to the inverting circuit, so that the negative half-cycle of the positive half-cycle AC signal is a positive half-wave;

[0026] The positive half-cycle AC signal with a negative half-cycle amplitude of zero or the positive half-cycle AC signal with a negative half-cycle of a positive half wave is transmitted to the circuit breaker through the switch control module and the control line as the control signal, and the transmission of the control signal is stopped until N preset end signals are transmitted to the control line, and the opening and closing status of the gate position operation module is determined according to the feedback signal, and the amplitude of the preset end signal within a unit cycle is zero.

[0027] Optionally, the control line module is specifically used for:

[0028] Determining whether N preset start signals are received;

[0029] If the receiving state is entered after receiving N of the preset start signals, the control signal transmitted by the electric energy meter is decoded into the corresponding voltage protection threshold and / or current protection threshold, and the decoding is stopped until N of the preset end signals are received.

[0030] Optionally, the processor is specifically configured to:

[0031] Controlling the switch control circuit to turn on and off based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, so as to transmit the control signal to the control line through the switch control circuit;

[0032] Determining the effective value of the voltage of the AC signal;

[0033] The opening and closing status of the gate position operation module is determined according to the magnitude relationship between the instantaneous value of the voltage in the positive half cycle of the feedback signal and the effective value of the voltage.

[0034] Optionally, also include:

[0035] A power supply module, wherein the power supply module is respectively connected to the power supply end of the acquisition module, the power supply end of the control line module, the power supply end of the feedback line module and the power supply end of the main control module, and is used to respectively output the DC voltage required for the acquisition module, the control line module, the feedback line module and the main control module to work.

[0036] Optionally, the main control module is specifically used to:

[0037] Determine whether the current voltage is greater than the voltage protection threshold and / or whether the current current is greater than the current protection threshold;

[0038] If the current voltage is greater than the voltage protection threshold or the current current is greater than the current protection threshold, controlling the gate position operation module to perform a gate opening operation;

[0039] If the current voltage is not greater than the voltage protection threshold and the current current is not greater than the current protection threshold, the gate position operation module is controlled not to perform a gate opening operation.

[0040] The object of the present invention is to provide a circuit breaker. In the present solution, the circuit breaker includes a main control module, a collection module, a gate position operation module, and a control line module, wherein the control line module can receive a control signal transmitted by an electric energy meter through a control line, and decode a corresponding voltage protection threshold and / or current protection threshold, so that the main control module can control whether the gate position operation module performs a gate opening operation according to the voltage protection threshold and / or current protection threshold, the current voltage and current current of the power grid. That is, the present solution can flexibly adjust the voltage protection threshold and / or current protection threshold of the circuit breaker according to the control signal transmitted by the electric energy meter, and then control the opening and closing of the gate position operation module to adapt to a variety of application environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0042] Figure 1 A schematic structural diagram of a circuit breaker provided by the present invention;

[0043] Figure 2 A schematic diagram of a closing signal provided by the present invention;

[0044] Figure 3 A schematic diagram of a gate opening signal provided by the present invention;

[0045] Figure 4 A schematic diagram of two logic 0 signals provided by the present invention;

[0046] Figure 5 A schematic diagram of two logic 1 signals provided by the present invention;

[0047] Figure 6 A schematic diagram of a signal for starting communication between an electric energy meter and a circuit breaker provided by the present invention;

[0048] Figure 7 A schematic diagram of a signal indicating the end of communication between an electric energy meter and a circuit breaker provided by the present invention;

[0049] Figure 8 A schematic diagram of the communication process between an electric energy meter and a circuit breaker provided by the present invention;

[0050] Fig. 9 A schematic diagram of the appearance of a circuit breaker provided by the present invention;

[0051] Fig.10 A schematic diagram of a signal sending process of an electric energy meter provided by the present invention;

[0052] Fig.11 A schematic diagram of a signal sending process, sending a start signal, sending a logic 1 signal, and sending a logic 0 signal of an electric energy meter provided by the present invention;

[0053] Fig.12 A schematic diagram of an electric energy meter provided by the present invention sending N data and sending an end signal;

[0054] Fig.13 A schematic diagram of a signal receiving process of an electric energy meter provided by the present invention;

[0055] Fig.14 A schematic diagram of a signal receiving process, a receiving logic signal and a receiving start signal of an electric energy meter provided by the present invention;

[0056] Fig.15 A schematic structural diagram of another circuit breaker provided by the present invention;

[0057] Fig.16 A schematic diagram of the connection between a circuit breaker and an electric energy meter provided by the present invention. DETAILED DESCRIPTION

[0058] The core of the present invention is to provide a circuit breaker. This solution can flexibly adjust the voltage protection threshold and / or current protection threshold of the circuit breaker according to the control signal transmitted by the electric energy meter, and then control the opening and closing of the gate position operation module to adapt to various application environments.

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a circuit breaker provided by the present invention. The circuit breaker comprises: a main control module 1, a collection module 2, a gate position operation module 3, and a control line module 4;

[0061] The input end of the acquisition module 2 is connected to the power grid, and the output end is connected to the first input end of the main control module 1, and is used to collect the current voltage and current of the power grid;

[0062] The input end of the gate position operation module 3 is connected to the power grid, the output end is connected to the load, and the control end is connected to the first output end of the main control module 1;

[0063] The input end of the control line module 4 is connected to the output end of the electric energy meter through the control line, and the output end is connected to the second input end of the main control module 1, and is used to decode the control signal transmitted by the electric energy meter into the corresponding voltage protection threshold and / or current protection threshold;

[0064] The main control module 1 is used to control whether the gate position operation module 3 performs a gate opening operation based on a voltage protection threshold and a current voltage and / or a current protection threshold and a current current.

[0065] In the present invention, considering that in the solution of the electric energy meter externally connected to the circuit breaker in the prior art, the voltage protection threshold and the current protection threshold of the circuit breaker are fixed and cannot be changed according to the change of the substation where the electric energy meter is located, resulting in the inability to be applied to multiple scenarios, the structure of the circuit breaker is improved in the present application, and a main control module 1, an acquisition module 2, a gate position operation module 3 and a control line module 4 are set inside the circuit breaker, wherein the control line module 4 can receive the control signal transmitted by the electric energy meter through the control line, and decode it into the corresponding voltage protection threshold and / or current protection threshold, the acquisition module 2 collects the current voltage and current current of the power grid, and the main control module 1 controls whether the gate position operation module 3 performs a gate opening operation according to the voltage protection threshold and the current voltage and / or current protection threshold and the current current. Because the electric energy meter can flexibly adjust the voltage protection threshold and / or current protection threshold of the circuit breaker, the circuit breaker can adapt to a variety of application environments.

[0066] It should be noted that this scheme designs a small circuit breaker as an external circuit breaker of the electric energy meter, which realizes control line control, feedback line feedback, communication through control line and feedback line, and protection functions. It has the functions of opening and closing the switch through the control line, and adds communication function through the existing control line and feedback line to realize communication, parameter setting and other functions.

[0067] It should also be noted that, in actual applications, the main control module 1 includes a microprocessor unit and a storage unit. The microprocessor unit stores a computer program that can execute the stored instructions to realize all the functions of the miniature circuit breaker; the storage unit includes an EEPROM memory for storing working parameters such as addresses, protection parameters, current specifications, etc.

[0068] The present embodiment provides a circuit breaker, wherein the circuit breaker in the present solution comprises a main control module 1, an acquisition module 2, a gate position operation module 3, and a control line module 4, wherein the control line module 4 can receive a control signal transmitted by an electric energy meter through a control line, and decode a corresponding voltage protection threshold and / or current protection threshold, so that the main control module 1 can control whether the gate position operation module 3 performs an opening operation according to the voltage protection threshold and / or current protection threshold, the current voltage and current current of the power grid, that is, the present solution can flexibly adjust the voltage protection threshold and / or current protection threshold of the circuit breaker according to the control signal transmitted by the electric energy meter, and then control the opening and closing of the gate position operation module 3 to adapt to a variety of application environments.

[0069] Based on the above embodiments:

[0070] As an optional embodiment, the control line module 4 includes: a control line interface and decoding module;

[0071] The input end of the control line interface is connected to the output end of the electric energy meter through the control line, and the output end is connected to the input end of the decoding module, and is used to receive the control signal transmitted by the electric energy meter through the control line;

[0072] The output end of the decoding module is connected to the second input end of the main control module 1, and is used to decode the control signal into a corresponding voltage protection threshold and / or current protection threshold.

[0073] In the present invention, because the control line module 4 needs to receive the control signal transmitted by the electric energy meter through the control line and perform corresponding decoding, the control line module 4 needs to include a control line interface and a decoding module, and the control line interface can receive the control signal transmitted by the electric energy meter through the control line, and the decoding module will decode the control signal into the corresponding voltage protection threshold and / or current protection threshold. The integrity of the function of the control line module 4 is guaranteed.

[0074] As an optional embodiment, it also includes:

[0075] Feedback line module 5, the input end of the feedback line module 5 is connected to the second output end of the main control module 1, and the output end is connected to the input end of the electric energy meter through the feedback line, which is used to encrypt the opening and closing status of the gate position operation module 3 transmitted by the main control module 1 into a feedback signal and transmit it to the electric energy meter.

[0076] In the present invention, considering that the fundamental purpose of the electric energy meter transmitting the control signal to the circuit breaker is to control the opening and closing status of the gate position operation module 3 in the circuit breaker, in order to enable the electric energy meter to obtain the opening and closing status of the gate position operation module 3 in time, a feedback line module 5 is additionally provided in this scheme, and the feedback line module 5 can encrypt the opening and closing status of the gate position operation module 3 transmitted by the main control module 1 into a feedback signal and transmit it to the electric energy meter, so that the electric energy meter can obtain the opening and closing status of the gate position operation module 3 in time. If the opening and closing status is inaccurate, the electric energy meter can also adjust the voltage protection threshold and / or current protection threshold corresponding to the control signal in time, and even issue a corresponding alarm to prompt the user that there is a corresponding fault in the circuit breaker.

[0077] As an optional embodiment, the feedback line module 5 includes: a feedback line interface and an encryption module;

[0078] The input end of the encryption module is connected to the second output end of the main control module 1, and is used to encrypt the opening and closing conditions of the gate position operation module 3 transmitted by the main control module 1 into a feedback signal;

[0079] The feedback line interface is connected to the input end of the electric energy meter through the feedback line, and is used to transmit the feedback signal to the electric energy meter through the feedback line.

[0080] In the present invention, because the feedback line module 5 needs to encrypt the opening and closing status of the gate position operation module 3 and transmit the encrypted feedback signal to the electric energy meter, the feedback line module 5 in this solution needs to include a feedback line interface and an encryption module, wherein the encryption module can encrypt the opening and closing status of the gate position operation module 3 transmitted by the main control module 1 into a feedback signal, and the feedback line interface can transmit the feedback signal to the electric energy meter through the feedback line, thereby ensuring the functional integrity of the feedback line module 5.

[0081] As an optional embodiment, an electric energy meter includes: a zero-crossing detection circuit, a processor, a switch control circuit, and a voltage acquisition circuit;

[0082] The input end of the zero-crossing detection circuit is connected to the power grid, and the output end is connected to the input end of the processor, and is used to send a positive half-cycle zero-crossing point trigger signal and a negative half-cycle zero-crossing point trigger signal to the processor respectively when the positive half-cycle zero-crossing point and the negative half-cycle zero-crossing point of the AC signal of the power grid are detected;

[0083] The output end of the processor is connected to the control end of the switch control circuit, and is used to control the switch control circuit to turn on and off based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, so as to transmit the control signal to the circuit breaker through the switch control circuit and the control line, and determine the opening and closing status of the gate position operation module 3 according to the feedback signal;

[0084] The output end of the switch control circuit is connected to the control line;

[0085] The voltage collection circuit is connected to the feedback line and is used to receive the feedback signal.

[0086] In the present invention, the electric energy meter is provided with a zero-crossing detection circuit, a processor, a switch control circuit, and a voltage acquisition circuit. Because the electric energy meter can generate a corresponding control signal based on the substation in which it is located and receive a feedback signal transmitted by the circuit breaker, this scheme requires a detailed description of the internal structure of the electric energy meter, that is, the zero-crossing detection circuit can send a positive half-cycle zero-crossing trigger signal and a negative half-cycle zero-crossing trigger signal to the processor respectively when detecting the positive half-cycle zero-crossing point and the negative half-cycle zero-crossing point of the AC signal of the power grid, and the voltage acquisition module 2 can receive the feedback signal. The processor controls the switch control circuit to open and close based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, so as to transmit the control signal to the control line through the switch control circuit, and can determine the opening and closing status of the gate position operation module 3 according to the feedback signal. The process and conditions of sending the control signal by the electric energy meter are accurately described to ensure the integrity of the electric energy meter function.

[0087] As an optional embodiment, the processor is specifically configured to:

[0088] Control the switch control circuit to turn on within a preset period, and transmit N preset start signals to the control line, the preset start signal is a voltage signal with two positive half cycles within a unit period, and N is a positive integer not less than 1;

[0089] When a positive half-cycle zero-crossing trigger signal is received, the switch control circuit is controlled to be turned on, so that the switch control module outputs a positive half-cycle AC signal;

[0090] When a negative half-cycle zero-crossing trigger signal is received, the control switch control circuit is turned on or off. If the control switch control circuit is turned off, the output end of the control switch control circuit is connected to the ground wire, so that the negative half-cycle amplitude of the positive half-cycle AC signal is zero; if the control switch control circuit is turned on, the output end of the control switch control circuit is connected to the inverting circuit, so that the negative half-cycle of the positive half-cycle AC signal is a positive half-wave;

[0091] A positive half-cycle AC signal with a negative half-cycle amplitude of zero or a positive half-cycle AC signal with a negative half-cycle amplitude of a positive half-wave is transmitted to the circuit breaker through the switch control module and the control line as a control signal, and the control signal is stopped when N preset end signals are transmitted to the control line, and the opening and closing status of the gate position operation module 3 is determined according to the feedback signal, and the amplitude of the preset end signal within the unit cycle is zero.

[0092] In the present invention, considering that when the electric energy meter and the circuit breaker communicate, they are limited by the reaction speed of the electric energy meter and the circuit breaker of the present application. When they suddenly receive a signal, they may not immediately enter into actions such as decoding and encryption. Therefore, before sending a control signal, the electric energy meter needs to control the switch control circuit to turn on within a preset period, and transmit N preset start signals to the control line, and control the switch control circuit to turn on when receiving a positive half-cycle zero-crossing trigger signal, so that the switch control module outputs a positive half-cycle AC signal, and controls the switch control circuit to turn on or off when receiving a negative half-cycle zero-crossing trigger signal. If the switch control circuit is turned off, the output end of the control switch control circuit is connected to the ground wire, so that the negative half-cycle amplitude of the positive half-cycle AC signal is zero; conversely, if the switch control circuit is turned on, the output end of the control switch control circuit needs to be connected to an inverting circuit, so that the negative half-cycle of the positive half-cycle AC signal is a positive half-wave. The positive half-cycle AC signal with a negative half-cycle amplitude of zero or the positive half-cycle AC signal with a negative half-cycle amplitude of a positive half-wave is used as a control signal, and then the control signal is transmitted to the control line through the switch control module until N preset end signals are transmitted to the control line, and the control signal transmission is stopped, and the opening and closing status of the gate position operation module 3 is determined according to the feedback signal, thereby ensuring the integrity and accuracy of the control signal transmission process.

[0093] It should be noted that the control signal transmitted by the control line is a 220V AC signal provided by the energy meter. The periodic signal contains positive and negative half cycles. If it continues for n cycles (n>=2), it means the closing signal is as follows: Figure 2 For example, the feedback line will also output a 220V AC signal. Figure 2 The signal in the example indicates that the gate is in the closed state. If there is no AC signal output on the control line for n cycles (n>=2), it means that the gate is disconnected. Figure 3 For example, at this time, the feedback line also has no signal output. Figure 3 When the AC signal input by the control line has two positive half cycles within the period range, it indicates logic 0. Figure 4 The example represents two logic 0s, and only a single positive half-cycle output represents a logic 1. Figure 5 The example shows two logic 1s. At this time, the feedback signal line still reflects the actual gate state. The control line receives n signals (n>=1) representing logic 0, indicating that the communication starts. Figure 6As shown in the figure, receiving a logic 0 signal at 0.4ms indicates the start of data transmission. From 0.06ms onwards, each cycle signal represents data. If there is no signal output for more than 3 cycles, it means the communication is over. Figure 7 As shown in the figure, after 0.04ms, there are three consecutive cycles without signal output, indicating that the communication is over. The signals indicating logic 1 and logic 0 are decoded and transmitted to the main control module 1. The main control module 1 processes the received data to complete parameter setting and other functions. If the main control module 1 needs to respond, the main control module 1 outputs data to the feedback line.

[0094] It should also be noted that after the feedback line module 5 receives the data from the main control unit, the logic 0 indicates that there are two positive half cycles in the full cycle of the AC signal. Figure 4 , logic 1 means that there is only a single positive half cycle in the entire cycle of the AC signal. Figure 5 Signal encoding. The signal is transmitted to the energy meter through the feedback line. When sending, n (n>=1) logic 0 signals are first sent and then the data signal is transmitted. After the data transmission is completed, there is no signal output for n (n>=3) cycles, which means the transmission is finished. Figure 7 As shown, there is no signal output for three cycles. The data communication process is as follows Figure 8 shown.

[0095] It should also be noted that if Fig. 9 As shown, the gate position operation module 3 includes a phase line interface and a gate position trigger, wherein the phase line interface is connected to the power grid, and the gate position trigger is used to connect the power grid and the load or disconnect the power grid and the load.

[0096] It should also be noted that if Fig.10 As shown, when the control line is used for communication, the zero-crossing detection circuit of the electric energy meter detects the input AC signal and outputs a trigger signal to the single-chip microcomputer of the main control module 1 when the AC signal crosses zero. After receiving the zero-crossing trigger signal, if there is data to be sent, the single-chip microcomputer controls the switch circuit to turn on and off and outputs a logic signal to the control line. The sending process of the logic signal 0 and 1 is shown in FIG. Fig.11 and Fig.12 As shown. The voltage acquisition circuit receives the signal of the feedback line to control the gate position and receive data. After the sending process starts, the start signal is first output to enable the receiver to enter the receiving state, and then the data is sent. Each time a logic 0 or logic 1 is sent, it must start at the zero point of the input AC signal. After the data is sent, the end signal is sent. The end is when there is no signal output for n consecutive times (n>=3).

[0097] It should also be noted that when using the feedback line for signal reception, the signal transmission diagram at the receiving end is as follows: Fig.13 As shown, and as Fig.14As shown, judging whether to enter the receiving state is based on the signal on the feedback line. If the received signal is logical 0 for n (n>=1) consecutive cycles, the reception starts. The signal received from the control line is judged to be logical 0 or logical 1. When the gate-off signal is received for n (n>=3) consecutive cycles, it means that the data transmission is finished. In the way of judging the received signal as a logical signal, for example: judging the signal of the standard sine wave 220V effective value 50Hz frequency, the judgment is made within 20ms after the zero point of the positive half cycle, that is, within the signal cycle, and n (n>=8) points are selected within 10ms of the positive half cycle to judge whether there are >=50% of these points with an instantaneous value greater than n times (-1<=n<=1) the voltage effective value. For example, a value greater than 0.5 times the effective value is selected to judge as signal code 1, a value -0.5 times the effective value is selected to judge as signal code 0, and if all are 0, it is judged as signal code 2. If the combination of the positive half cycle and the negative half cycle is 11, it is a logic 0, if it is 12, it is a logic 1, if it is 22, it is an opening signal, and if it is 10, it is a closing signal.

[0098] As an optional embodiment, the control line module 4 is specifically used for:

[0099] Determine whether N preset start signals are received;

[0100] If the receiving state is entered after receiving N preset start signals, the control signal transmitted by the electric energy meter is decoded into the corresponding voltage protection threshold and / or current protection threshold, and the decoding is stopped until N preset end signals are received.

[0101] In the present invention, in order to ensure that the circuit breaker can perform corresponding decoding, opening and closing operations according to the control signal in time, the electric energy meter will send N preset start signals within a preset period before sending the control signal to remind the circuit breaker that corresponding parameter adjustments need to be made. Therefore, the control line module 4 in this scheme needs to first determine whether N preset start signals are received. If N preset start signals are received, it enters the receiving state and decodes the control signal transmitted by the electric energy meter into the corresponding voltage protection threshold and / or current protection threshold until N preset end signals are received to stop decoding, thereby ensuring the accuracy and reliability of the decoding process of the control line module 4.

[0102] As an optional embodiment, the processor is specifically configured to:

[0103] Based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, the switch control circuit is controlled to be turned on and off, so as to transmit the control signal to the control line through the switch control circuit;

[0104] Determine the voltage RMS value of an AC signal;

[0105] The opening and closing status of the gate position operation module 3 is determined according to the magnitude relationship between the instantaneous value of the voltage and the effective value of the voltage in the positive half cycle of the feedback signal.

[0106] In the present invention, considering that the processor in the electric energy meter can not only output the corresponding control signal to the circuit breaker, but also needs to determine the opening and closing status of the gate position operation module 3 according to the feedback signal, so it is necessary to determine the actual process of the processor analyzing the feedback signal, and because there is a corresponding relationship between the instantaneous value of the voltage in the positive half-cycle of the feedback signal and the effective value of the voltage of the AC signal of the power grid, the processor in this scheme first determines the effective value of the voltage of the AC signal, and then determines the opening and closing status of the gate position operation module 3 according to the relationship between the instantaneous value of the voltage in the positive half-cycle of the feedback signal and the effective value of the voltage, thereby ensuring the accuracy of the opening and closing status determination process.

[0107] As an optional embodiment, it also includes:

[0108] The power supply module 6 is respectively connected to the power supply end of the acquisition module 2, the power supply end of the control line module 4, the power supply end of the feedback line module 5 and the power supply end of the main control module 1, and is used to output the DC voltage required for the acquisition module 2, the control line module 4, the feedback line module 5 and the main control module 1 to work.

[0109] In the present invention, Fig.15 As shown, considering that a plurality of modules are arranged in the circuit breaker and the operation of each module requires a corresponding DC voltage supply, in order to improve the convenience of the circuit breaker, the present solution arranges a power module 6 inside the circuit breaker, and transmits the DC voltage required for the operation to the acquisition module 2, the control line module 4, the feedback line module 5 and the main control module 1 through the power module 6, thereby greatly improving the portability of the circuit breaker.

[0110] It should be noted that the small circuit breaker is installed at the rear end of the smart energy meter, receives the control signal of the smart energy meter to open or close the gate position, and reliably feeds back the gate position signal to the smart energy meter on the feedback line. The communication function can be realized by encoding data on the control line and the feedback line. The input unit decodes the data and transmits it to the main control module 1 to realize the function of configuring the protection parameters through the main control module 1. The schematic diagram of the connection between the energy meter and the circuit breaker is shown in Fig.16 shown.

[0111] As an optional embodiment, the main control module 1 is specifically used for:

[0112] Determine whether the current voltage is greater than a voltage protection threshold and / or whether the current current is greater than a current protection threshold;

[0113] If the current voltage is greater than the voltage protection threshold or the current current is greater than the current protection threshold, the gate position operation module 3 is controlled to perform a gate opening operation;

[0114] If the current voltage is not greater than the voltage protection threshold and the current current is not greater than the current protection threshold, the gate position operation module 3 is controlled not to perform the opening operation.

[0115] In the present invention, considering that the principle of the circuit breaker is to disconnect the circuit when overvoltage or overcurrent occurs in the circuit, the main control module 1 needs to determine whether the current voltage is greater than the voltage protection threshold and / or whether the current current is greater than the current protection threshold, that is, to determine whether the circuit has an overvoltage and / or overcurrent condition. If the current voltage is greater than the voltage protection threshold or the current current is greater than the current protection threshold, that is, as long as the circuit has an overvoltage or overcurrent condition, it is necessary to control the gate position operation module 3 to perform a gate opening operation; conversely, if the current voltage is not greater than the voltage protection threshold and the current current is not greater than the current protection threshold, that is, the circuit has no overvoltage or overcurrent condition, then the gate position operation module 3 is controlled not to perform a gate opening operation, thereby ensuring the accuracy of the circuit breaker's opening and closing process.

[0116] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0117] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circuit breaker, characterized in that: include: Main control module, acquisition module, gate position operation module, control line module; The input end of the acquisition module is connected to the power grid, and the output end is connected to the first input end of the main control module, and is used to collect the current voltage and current of the power grid; The input end of the gate position operation module is connected to the power grid, the output end is connected to the load, and the control end is connected to the first output end of the main control module; The input end of the control line module is connected to the output end of the electric energy meter through the control line, and the output end is connected to the second input end of the main control module, and is used to decode the control signal transmitted by the electric energy meter into a corresponding voltage protection threshold and / or current protection threshold; The main control module is used to control whether the gate position operation module performs a gate opening operation based on the voltage protection threshold and the current voltage and / or the current protection threshold and the current current.

2. The circuit breaker according to claim 1, characterized in that The control line module includes: a control line interface and a decoding module; The input end of the control line interface is connected to the output end of the electric energy meter through the control line, and the output end is connected to the input end of the decoding module, and is used to receive the control signal transmitted by the electric energy meter through the control line; The output end of the decoding module is connected to the second input end of the main control module, and is used to decode the control signal into a corresponding voltage protection threshold and / or current protection threshold.

3. The circuit breaker according to claim 1, characterized in that: Also includes: A feedback line module, wherein the input end of the feedback line module is connected to the second output end of the main control module, and the output end is connected to the input end of the electric energy meter through a feedback line, and is used to encrypt the opening and closing status of the gate position operation module transmitted by the main control module into a feedback signal and transmit it to the electric energy meter.

4. The circuit breaker according to claim 3, characterized in that The feedback line module includes: a feedback line interface and an encryption module; The input end of the encryption module is connected to the second output end of the main control module, and is used to encrypt the opening and closing conditions of the gate position operation module transmitted by the main control module into the feedback signal; The feedback line interface is connected to the input end of the electric energy meter through the feedback line, and is used to transmit the feedback signal to the electric energy meter through the feedback line.

5. The circuit breaker according to claim 1, characterized in that: The electric energy meter comprises: a zero-crossing detection circuit, a processor, a switch control circuit, and a voltage acquisition circuit; The input end of the zero-crossing detection circuit is connected to the control signal output end of the electric energy meter, and the output end is connected to the input end of the processor, and is used to send a positive half-cycle zero-crossing point trigger signal and a negative half-cycle zero-crossing point trigger signal to the processor respectively when the positive half-cycle zero-crossing point and the negative half-cycle zero-crossing point of the AC signal of the power grid are detected; The output end of the processor is connected to the control end of the switch control circuit, and is used to control the switch control circuit to be turned on and off based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, so as to transmit the control signal to the circuit breaker through the switch control circuit and the control line, and determine the opening and closing status of the gate position operation module according to the feedback signal; The output end of the switch control circuit is connected to the control line; The voltage collection circuit is connected to the feedback line and is used to receive the feedback signal.

6. The circuit breaker according to claim 5, characterized in that The processor is specifically used for: Control the switch control circuit to start within a preset period, and transmit N preset start signals to the control line, wherein the preset start signal is a voltage signal having two positive half cycles within a unit period, and N is a positive integer not less than 1; When the positive half-cycle zero-crossing trigger signal is received, the switch control circuit is controlled to be turned on, so that the switch control module outputs a positive half-cycle AC signal; When the negative half-cycle zero-crossing trigger signal is received, the switch control circuit is controlled to be turned on or off. If the switch control circuit is controlled to be turned off, the output end of the switch control circuit is controlled to be connected to the ground line, so that the negative half-cycle amplitude of the positive half-cycle AC signal is zero; if the switch control circuit is controlled to be turned on, the output end of the switch control circuit is controlled to be connected to the inverting circuit, so that the negative half-cycle of the positive half-cycle AC signal is a positive half-wave; The positive half-cycle AC signal with a negative half-cycle amplitude of zero or the positive half-cycle AC signal with a negative half-cycle of a positive half wave is transmitted to the circuit breaker through the switch control module and the control line as the control signal, and the transmission of the control signal is stopped until N preset end signals are transmitted to the control line, and the opening and closing status of the gate position operation module is determined according to the feedback signal, and the amplitude of the preset end signal within a unit cycle is zero.

7. The circuit breaker according to claim 6, characterized in that The control line module is specifically used for: Determining whether N preset start signals are received; If the receiving state is entered after receiving N of the preset start signals, the control signal transmitted by the electric energy meter is decoded into the corresponding voltage protection threshold and / or current protection threshold, and the decoding is stopped until N of the preset end signals are received.

8. The circuit breaker according to claim 5, characterized in that The processor is specifically used for: Controlling the switch control circuit to turn on and off based on the positive half-cycle zero-crossing trigger signal and the negative half-cycle zero-crossing trigger signal, so as to transmit the control signal to the control line through the switch control circuit; Determining the effective value of the voltage of the AC signal; The opening and closing status of the gate position operation module is determined according to the magnitude relationship between the instantaneous value of the voltage in the positive half cycle of the feedback signal and the effective value of the voltage.

9. The circuit breaker according to claim 3, characterized in that: Also includes: A power supply module, wherein the power supply module is respectively connected to the power supply end of the acquisition module, the power supply end of the control line module, the power supply end of the feedback line module and the power supply end of the main control module, and is used to respectively output the DC voltage required for the acquisition module, the control line module, the feedback line module and the main control module to work.

10. The circuit breaker according to any one of claims 1 to 9, characterized in that: The main control module is specifically used for: Determine whether the current voltage is greater than the voltage protection threshold and / or whether the current current is greater than the current protection threshold; If the current voltage is greater than the voltage protection threshold or the current current is greater than the current protection threshold, controlling the gate position operation module to perform a gate opening operation; If the current voltage is not greater than the voltage protection threshold and the current current is not greater than the current protection threshold, the gate position operation module is controlled not to perform a gate opening operation.

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