Data acquisition device of intelligent circuit breaker and intelligent circuit breaker

Abstract

The data acquisition device comprises a bottom shell and a cover plate, the bottom shell is internally provided with a phase current transformer used for detecting current, the bottom shell is provided with a wire passing through hole used for allowing an outgoing wire or an incoming wire of a circuit breaker body to pass through, the bottom shell is internally provided with a data acquisition board, and the data acquisition board is internally provided with a data processing module. The current transformer is electrically connected with the data acquisition board, the data acquisition board is electrically connected with binding posts in one-to-one correspondence with outgoing line terminals or incoming line terminals of the circuit breaker body, the cover plate is located at the upper end of the data acquisition board and fixedly connected with the bottom shell, and the cover plate is provided with first via holes for the binding posts and outgoing lines or incoming lines to penetrate through. The data acquisition board is provided with a via hole for the outgoing line or the incoming line to pass through. According to the data acquisition device, various kinds of information such as voltage, current, temperature and electric leakage amount in the working process of the circuit breaker are acquired through the micro sensor and the data acquisition board, power utilization faults can be monitored, and life and property safety of users can be protected conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and in particular to a data acquisition device for an intelligent circuit breaker and an intelligent circuit breaker. Background Art

[0002] At present, with the popularization of electrical equipment, electrical safety issues are prominent, such as electrical leakage, electrical burning and fire, and the circuit safety situation is severe. Traditional circuit breakers do not have data collection functions, and the circuit safety protection schemes of traditional circuit breakers are backward, and circuit safety problems cannot be discovered in time. At the same time, in terms of triggering power outages, manual operation is usually required or fuses are blown to achieve power outages. This type of management method cannot accurately and timely cut off power to protect the safety of users' lives and property. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art, and proposes a data acquisition device for an intelligent circuit breaker and an intelligent circuit breaker.

[0004] The technical solution of the utility model is implemented as follows: the utility model discloses a data acquisition device for an intelligent circuit breaker, comprising a bottom shell and a cover plate, wherein a phase current transformer for detecting current is installed in the bottom shell, the bottom shell is provided with a through hole for passing an outgoing line or an incoming line of the circuit breaker body, a data acquisition board is installed in the bottom shell, the current transformer is electrically connected to the data acquisition board, the data acquisition board is electrically connected with a terminal corresponding to the outgoing line terminal or the incoming line terminal of the circuit breaker body, the cover plate is located at the upper end of the data acquisition board and is fixedly connected to the bottom shell, the cover plate is provided with a first through hole for passing the terminal and the outgoing line or the incoming line, and the data acquisition board is provided with a through hole for passing the outgoing line or the incoming line.

[0005] Furthermore, a phase current transformer is installed in the bottom shell, corresponding to the L-phase outgoing line or incoming line, and the phase current transformer surrounds the outside of the line through hole corresponding to the L-phase outgoing line or incoming line;

[0006] or,

[0007] Three phase current transformers are installed in the bottom shell, corresponding to the A, B, C three-phase outgoing or incoming lines respectively, and the three phase current transformers are respectively surrounded by the outside of the line through holes corresponding to the A, B, C three-phase outgoing or incoming lines.

[0008] Furthermore, a zero-sequence current transformer is installed in the bottom shell, the zero-sequence current transformer surrounds the outside of the three-phase current transformers, and the zero-sequence current transformer is electrically connected to the data acquisition board.

[0009] Furthermore, a first accommodating groove for accommodating a phase current transformer is provided on the bottom wall of the bottom shell, and a second accommodating groove for accommodating a zero-sequence current transformer is provided on the bottom wall of the bottom shell.

[0010] Furthermore, a hollow cylinder is provided on the bottom wall of the bottom shell, corresponding one to one with the wire-passing through holes provided on the bottom wall of the bottom shell, and the hollow cylinder is communicated with the corresponding wire-passing through holes.

[0011] Furthermore, a data transmission interface is provided on the data acquisition board, a second through hole for the data transmission interface to pass through is provided on the cover plate, a voltage sampling circuit is provided on the data acquisition board, an input end of the voltage sampling circuit is connected to a corresponding terminal, an output end of the voltage sampling circuit is connected to the data transmission interface, and the current transformer is electrically connected to the data transmission interface provided on the data acquisition board via a connector.

[0012] Further, the voltage sampling circuit includes a resistor R7, a resistor R14 and a resistor R21 and capacitors C1, C2 and C3, the resistor R7 is connected in parallel with the capacitor C1, the resistor R14 is connected in parallel with the capacitor C2, the resistor R21 is connected in parallel with the capacitor C3, the first end of the resistor R7 is electrically connected to the A-phase terminal via a first voltage divider unit, the first end of the resistor R14 is electrically connected to the B-phase terminal via a second voltage divider unit, the first end of the resistor R21 is electrically connected to the C-phase terminal via a third voltage divider unit, the second end of the resistor R7, the second end of the resistor R14 and the second end of the resistor R21 are grounded, the first end of the resistor R7 is the A-phase voltage detection point, the first end of the resistor R14 is the B-phase voltage detection point, the first end of the resistor R21 is the C-phase voltage detection point, and the A-phase voltage detection point, the B-phase voltage detection point and the C-phase voltage detection point are connected to the data transmission interface on the data acquisition board.

[0013] Furthermore, the first resistance unit, the second resistance unit, and the third resistance unit are all formed by at least one resistor connected in series.

[0014] Furthermore, the data acquisition board is provided with a temperature detection circuit for detecting the temperature of the terminal.

[0015] Furthermore, the temperature detection circuit adopts a thermistor.

[0016] Further, the temperature detection circuit includes a thermistor, one end of the thermistor is respectively connected to one end of the resistor R23 and one end of the resistor R24, the other end of the resistor R23 is connected to the power supply voltage VCC, the other end of the resistor R24 ​​is connected to the data transmission interface and one end of the capacitor C4, the other end of the capacitor C4 and the other end of the thermistor are grounded. The other end of the capacitor C4 and the other end of the thermistor are connected to the N terminal.

[0017] The utility model also discloses an intelligent circuit breaker, comprising a circuit breaker body and the data acquisition device as described above, wherein the data acquisition device is detachably connected to the circuit breaker body, and the terminal of the data acquisition device is inserted into the circuit breaker body and electrically connected to the outlet terminal or the inlet terminal of the circuit breaker body.

[0018] Furthermore, the intelligent circuit breaker of the utility model further comprises an electronic module, which is detachably connected to the circuit breaker body and the data acquisition device respectively;

[0019] The electronic module is used to upload the data collected by the data collection device to the external networking device, and to receive and execute the instructions sent by the external networking device to manipulate the circuit breaker body to perform opening and closing operations.

[0020] Compared with the prior art, the utility model has the following beneficial effects: the data acquisition device of the utility model collects various voltage, current, temperature, leakage and other information during the operation of the circuit breaker through micro sensors and data acquisition boards, and is easy to assemble with the circuit breaker body.

[0021] The utility model integrates the above data acquisition device on the circuit breaker body for data acquisition. By real-time monitoring of various voltages, currents, temperatures, leakage currents and other information during the operation of the circuit breaker, power failures can be determined, and the circuit breaker body can be manipulated to perform a tripping operation when a power failure occurs.

[0022] The power usage status of the construction power distribution box can also be monitored in real time through the circuit breaker. When there is a risk of power failure, the management personnel will be alarmed in real time, and the power risk fault points can be found in time for maintenance to eliminate safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an intelligent circuit breaker provided in an embodiment of the utility model;

[0024] Figure 2 A structural schematic diagram of a data acquisition device for an intelligent circuit breaker provided in an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the structure of a bottom shell and a cover plate of a data acquisition device for an intelligent circuit breaker provided in an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of the structure of a bottom shell of a data acquisition device for an intelligent circuit breaker provided by an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of the installation of a phase current transformer and a zero-sequence current transformer provided in an embodiment of the utility model;

[0028] Figure 6 A circuit diagram of a data acquisition board provided by an embodiment of the utility model;

[0029] Figure 7 A circuit diagram of a rectifier board provided in an embodiment of the utility model;

[0030] Figure 8 A circuit diagram of the main control circuit part of the mainboard provided by the embodiment of the utility model;

[0031] Fig. 9 A circuit diagram of the metering chip portion of the mainboard provided by the embodiment of the utility model;

[0032] Fig.10 A circuit diagram of the RS485 communication circuit provided by the embodiment of the utility model;

[0033] Fig.11 A circuit diagram of a trip control circuit provided by an embodiment of the utility model;

[0034] Fig.12 A circuit diagram of a PE loop detection circuit provided by an embodiment of the utility model;

[0035] Fig.13 A circuit diagram of a PE disconnection detection circuit provided by an embodiment of the utility model;

[0036] Fig.14 A circuit diagram of a power supply circuit provided in an embodiment of the utility model;

[0037] Fig.15 A circuit diagram of a display circuit provided by an embodiment of the utility model;

[0038] Fig.16 A circuit diagram of a leakage detection circuit provided in an embodiment of the present invention.

[0039] In the accompanying drawings, 1 is an electronic module, 2 is a data acquisition device, 21 is a bottom shell, 211 is a first accommodating groove, 212 is a second accommodating groove, 213 is a hollow cylinder, 214 is a wire through hole, 215 is a first connecting hole, 22 is a cover plate, 221 is a first through hole, 222 is a second through hole, 223 is a third through hole, 224 is a second connecting hole, 23 is a phase current transformer, 24 is a zero-sequence current transformer, 251 is an A terminal, 252 is a B terminal, 253 is a C terminal, 254 is an N terminal, 255 is a PE terminal, 26 is a data transmission interface, 27 is a power interface, and 3 is a circuit breaker body. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described target changes, the relative positional relationship may also change accordingly.

[0042] In each of the accompanying drawings, identical elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not all drawn to scale. In addition, some well-known parts may not be shown in the drawings.

[0043] Many specific details of the present invention are described below, such as the structure, materials, dimensions, processing technology and techniques of the components, so as to more clearly understand the present invention. However, as those skilled in the art will appreciate, the present invention may be implemented without following these specific details.

[0044] See also Figures 1 to 5 The embodiment of the utility model provides a data acquisition device 2 for an intelligent circuit breaker, comprising a bottom shell 21 and a cover plate 22, wherein a phase current transformer 23 for detecting current is installed in the bottom shell 21, and a through-hole 214 for passing an outgoing line or an incoming line of a circuit breaker body 3 is provided on the bottom shell 21, and a data acquisition board is installed in the bottom shell 21, and the current transformer is electrically connected to the data acquisition board, and the data acquisition board is electrically connected with a terminal corresponding to the outgoing line terminal or the incoming line terminal of the circuit breaker body 3 one by one, the cover plate 22 is located at the upper end of the data acquisition board, and is fixedly connected to the bottom shell 21, and a first through-hole 221 for passing the terminal and the outgoing line or the incoming line is provided on the cover plate 22, and a through-hole for passing the outgoing line or the incoming line is provided on the data acquisition board.

[0045] In some embodiments, the terminal is welded and fixed on the data acquisition board.

[0046] In some embodiments, when the intelligent circuit breaker is a single-phase circuit breaker, the data acquisition board is provided with an L terminal, an N terminal 254 and a PE terminal 255. A phase current transformer 23 is installed in the bottom shell 21, corresponding to the L-phase outgoing or incoming line, and the phase current transformer 23 surrounds the outside of the line through hole 214 corresponding to the L-phase outgoing or incoming line.

[0047] In other embodiments, when the intelligent circuit breaker is a three-phase circuit breaker, the data acquisition board is provided with A terminal 251, B terminal 252, C terminal 253, N terminal 254 and PE terminal 255. Three phase current transformers 23 are installed in the bottom shell 21, corresponding to the A, B, C three-phase outgoing or incoming lines, respectively, and the three phase current transformers 23 are respectively surrounded by the outside of the line through holes 214 corresponding to the A, B, C three-phase outgoing or incoming lines.

[0048] Furthermore, a first accommodating groove 211 for accommodating the phase current transformer 23 is provided on the bottom wall of the bottom shell 21 .

[0049] Further, when the intelligent circuit breaker is a three-phase circuit breaker, a zero-sequence current transformer 24 is also installed in the bottom shell 21, and the zero-sequence current transformer 24 surrounds the outside of the three-phase current transformers 23, and the zero-sequence current transformer 24 is electrically connected to the data acquisition board. The zero-sequence current transformer 24 of this embodiment surrounds the outside of the three-phase lines A, B, and C and the neutral line N. Further, the zero-sequence current transformer surrounds the outside of the three-phase outgoing lines A, B, and C and the neutral line N outgoing line.

[0050] A second accommodating groove 212 for accommodating the zero-sequence current transformer 24 is provided on the bottom wall of the bottom shell 21 .

[0051] Two electric wires are led out from the phase current transformer 23 and the zero sequence current transformer 24, and are electrically connected to the data acquisition board through a matching connector. The data acquisition board is electrically connected to the main board through a data transmission interface 26, namely, a connector P4.

[0052] Furthermore, a hollow cylinder 213 is provided on the bottom wall of the bottom shell 21, corresponding to the wire through holes 214 provided on the bottom wall of the bottom shell 21, and the hollow cylinder 213 is connected to the corresponding wire through holes 214. The aperture of the hollow cylinder 213 is the same as that of the wire through holes 214.

[0053] In some embodiments, the bottom shell 21 includes a bottom wall and a first side wall extending upward from the edge of the bottom wall, the bottom wall and the first side wall are connected to enclose an open receiving cavity, the bottom wall of the bottom shell 21 extends upward with a second side wall, the second side wall is located outside the hollow cylinder 213 corresponding to the A, B, C three-phase outgoing or incoming line or the L-phase outgoing or incoming line, and a receiving groove for accommodating the phase current transformer 23 is formed between the second side wall and the corresponding hollow cylinder 213. The bottom wall of the bottom shell 21 extends upward with a third side wall and a fourth side wall, and a receiving groove for accommodating the zero-sequence current transformer 24 is formed between the third side wall and the fourth side wall.

[0054] Furthermore, the first side wall, the second side wall, the third side wall, the fourth side wall and the bottom wall are integrally formed.

[0055] Furthermore, the bottom shell 21 is provided with a first connection hole 215 , and the cover plate 22 is provided with a second connection hole 224 corresponding to the first connection hole 215 .

[0056] Further, see Figure 6 The data acquisition board is provided with a connector, including a data transmission interface 26, namely a connector P4, and a power interface 27, namely a connector P3. The cover plate 22 is provided with a second through hole 222 for the data transmission interface 26 to pass through, and a third through hole 223 for the power interface 27 to pass through. The data acquisition board is provided with a voltage sampling circuit, the input end of the voltage sampling circuit is connected to the corresponding terminal, and the output end of the voltage sampling circuit is connected to the data transmission interface. The current transformer is electrically connected to the data transmission interface set on the data acquisition board via the connector.

[0057] Further, the voltage sampling circuit includes a resistor R7, a resistor R14 and a resistor R21 and a capacitor C1, a capacitor C2 and a capacitor C3, the resistor R7 is connected in parallel with the capacitor C1, the resistor R14 is connected in parallel with the capacitor C2, the resistor R21 is connected in parallel with the capacitor C3, the first end of the resistor R7 is electrically connected to the A-phase terminal via a first resistor unit, the second end of the resistor R7, the second end of the resistor R14 and the second end of the resistor R21 are grounded, the first end of the resistor R14 is electrically connected to the B-phase terminal via a second resistor unit, the second end of the resistor R14 is electrically connected to the second end of the resistor R7 and the second end of the resistor R21 are grounded, The second end of the resistor R21 is connected, the first end of the resistor R21 is electrically connected to the C-phase terminal via the third resistor unit, the second end of the resistor R21 is connected to the second end of the resistor R7 and the second end of the resistor R14, the first end of the resistor R7 is the A-phase voltage detection point, the first end of the resistor R14 is the B-phase voltage detection point, the first end of the resistor R21 is the C-phase voltage detection point, the A-phase voltage detection point, the B-phase voltage detection point and the C-phase voltage detection point are respectively connected to the data transmission interface 26 set on the data acquisition board, and the current transformer is connected to the data transmission interface 26 set on the data acquisition board.

[0058] Furthermore, the first resistance unit, the second resistance unit, and the third resistance unit are all formed by a plurality of resistors connected in series.

[0059] Furthermore, a temperature detection circuit for detecting temperature is provided on the data acquisition board.

[0060] Furthermore, the data acquisition board is provided with a temperature detection circuit for detecting the temperature of the terminal.

[0061] Furthermore, a thermistor is arranged on the data acquisition board and is located at the back of the terminal for detecting the temperature of the terminal.

[0062] The temperature detection circuit adopts a thermistor. The temperature detection circuit includes a thermistor, one end of the thermistor is respectively connected to one end of a resistor R23 and one end of a resistor R24, the other end of the resistor R23 is connected to a power supply voltage VCC, and the other end of the resistor R24 ​​is connected to a data transmission interface 26, i.e., a connector P4, and the AD sampling port of the main control chip is connected via the connector P4 (the main control chip is the MCU on the main board). The other end of the resistor R24 ​​is connected to one end of a capacitor C4, and the other end of the capacitor C4 and the other end of the thermistor are grounded. The other end of the capacitor C4 and the other end of the thermistor are connected to an N terminal 254.

[0063] Further, see Figure 7 The data acquisition device 2 also includes a rectifier board, on which a rectifier unit is provided, an input end of the rectifier unit is connected to the phase line, an output end of the rectifier unit is connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power interface.

[0064] In some embodiments, the rectifier board is provided with a first rectifier unit, a second rectifier unit, and a third rectifier unit. The first end of the first rectifier unit is electrically connected to the A terminal 251 on the data acquisition board directly or via the connector JP2, the first end of the second rectifier unit is electrically connected to the B terminal 252 on the data acquisition board directly or via the connector JP4, the first end of the third rectifier unit is electrically connected to the C terminal 253 on the data acquisition board directly or via the connector JP5, the second end of the first rectifier unit, the second end of the second rectifier unit, and the second end of the third rectifier unit are all connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power interface.

[0065] The first rectifier unit, the second rectifier unit, and the third rectifier unit are each composed of at least one rectifier diode connected in series, with the positive pole being the first end and the negative pole being the second end.

[0066] A second end of at least one of the first rectifier unit, the second rectifier unit, and the third rectifier unit is connected to one end of the second power resistor, and the other end of the second power resistor is connected to the power interface 27, ie, the connector P3, directly or via the connector JP3.

[0067] The data acquisition board and the rectifier board are electrically connected through a connector, such as the straight pins on the data acquisition board are plugged into the straight pin holes on the rectifier board, or the straight pin holes on the data acquisition board are plugged into the straight pins on the rectifier board, so that the data acquisition board and the rectifier board are fixedly connected and electrically connected.

[0068] The data acquisition board of this embodiment is provided with a straight pin JP1_1, a straight pin JP2_1, a straight pin JP3_1, a straight pin JP4_1 and a straight pin JP5_1, the straight pin JP1_1 is electrically connected to the second end of the test winding, the straight pin JP2_1 is electrically connected to the A terminal 251, the straight pin JP3_1 is electrically connected to the power interface 27, i.e., the connector P3 (for supplying the voltage rectified by the rectifier board to the power interface 27), the straight pin JP4_1 is electrically connected to the B terminal 252, and the straight pin JP5_1 is electrically connected to the C terminal 253.

[0069] The rectifier plate is provided with a straight pin hole JP1, a straight pin hole JP2, a straight pin hole JP3, a straight pin hole JP4 and a straight pin hole JP5. The straight pin JP1_1 is plugged into the straight pin hole JP1, the straight pin JP2_1 is plugged into the straight pin hole JP2, the straight pin JP3_1 is plugged into the straight pin hole JP3, and the straight pin JP4_1 is plugged into the straight pin hole JP4.

[0070] The first end of the first rectifier unit is electrically connected to the straight pin hole JP2 and one end of the first power resistor, respectively, the first end of the second rectifier unit is electrically connected to the straight pin hole JP4, the first end of the third rectifier unit is electrically connected to the straight pin hole JP5, and the second end of the first rectifier unit and the second end of the second rectifier unit and the second end of the third rectifier unit are all connected to one end of the second power resistor. The other end of the first power resistor is electrically connected to the straight pin hole JP1. The second end of the first rectifier unit is connected to one end of the second power resistor, and the other end of the second power resistor is electrically connected to the straight pin hole JP3, and is connected to the power interface 27, i.e., connector P3, through the straight pin hole JP3 and the straight pin JP3-1.

[0071] Of course, the circuit on the rectifier board can also be set on the data acquisition board.

[0072] The data acquisition device 2 of the utility model also includes a test winding, one end of which is connected to one end of the first power resistor, the other end of which is electrically connected to a phase line (such as the A terminal corresponding to the A phase line in this embodiment), and the other end of the test winding is grounded via a test switch device. When the test winding is energized, the zero-sequence current transformer can detect a current signal. When the test switch device is closed, the test winding is energized, at which time the zero-sequence current transformer can detect a current signal and transmit it to the main control circuit, which controls the circuit breaker to trip, so that it can be detected whether the circuit breaker can perform a tripping operation.

[0073] Furthermore, the test winding and the zero-sequence current transformer are wound on the same magnetic ring.

[0074] Embodiment 2

[0075] The embodiment of the utility model also discloses an intelligent circuit breaker, comprising a circuit breaker body 3 and a data acquisition device 2 as described in the first embodiment, wherein the data acquisition device 2 is detachably connected to the circuit breaker body 3, and the terminal of the data acquisition device 2 is inserted into the circuit breaker body 3 and electrically connected to the output terminal or the input terminal of the circuit breaker body 3.

[0076] The incoming and outgoing sides of the circuit breaker body are both provided with screw holes for fixing the wires (wiring). The screw holes on the incoming side of the circuit breaker body correspond one-to-one with the incoming terminals. The screw holes on the outgoing side of the circuit breaker body correspond one-to-one with the outgoing terminals. Loosen the screws in the screw holes to remove the wiring. Tighten the screws in the screw holes on the incoming side of the circuit breaker body to electrically connect the incoming wires on the incoming side of the circuit breaker body to the incoming terminals. Tighten the screws in the screw holes on the outgoing side of the circuit breaker body to electrically connect the outgoing wires on the outgoing side of the circuit breaker body to the outgoing terminals.

[0077] The data acquisition device 2 of this embodiment is detachably connected to the outgoing terminal of the circuit breaker body 3. The terminal of the data acquisition device 2 is inserted into the circuit breaker body 3 and electrically connected to the outgoing terminal of the circuit breaker body 3.

[0078] Furthermore, the intelligent circuit breaker of the present invention further comprises an electronic module 1 , and the electronic module 1 is detachably connected to the circuit breaker body 3 and the data acquisition device 2 .

[0079] The electronic module 1 is used to upload the data collected by the data acquisition device 2 to the external networking device, and receive and execute the instructions issued by the external networking device to operate the circuit breaker body 3 to perform opening and closing operations.

[0080] Further, the electronic module 1 includes an electronic housing, which includes a left housing, a middle housing, and a right housing, which are detachably connected to form an installation cavity in the electronic housing. A mainboard, a power board, and a panel are fixed on the electronic housing. The mainboard, the power board, and the panel can be installed in the installation cavity.

[0081] See also Figure 8 and Fig. 9 The main board is provided with a main control chip, a metering chip, and an RS485 communication circuit, one end of the RS485 communication circuit is electrically connected to the main control chip, and the other end of the RS485 communication circuit is connected to the communication interface. The input end of the metering chip is electrically connected to the voltage detection points (A phase voltage detection point, B phase voltage detection point and C phase voltage detection point) and the phase current transformer 23 (A phase current transformer 23, B phase current transformer 23, C phase current transformer 23) on the data acquisition board, and the output end of the metering chip is connected to the input end of the main control chip.

[0082] The input end of the voltage sampling circuit is used to receive the phase voltage, the output end of the voltage sampling circuit is connected to the voltage measurement signal input end VAP of the metering chip, and the output end of the metering chip is connected to the main control circuit. The voltage measurement signal input end VAN of the metering chip is connected to one end of the resistor R20, the other end of the resistor R20 is grounded, and the two ends of the resistor R20 are connected in parallel with a capacitor C29.

[0083] In some embodiments, taking phase A as an example, one end of the phase current transformer is respectively connected to one end of a resistor R19 and one end of a resistor R23, the other end of the resistor R19 is respectively connected to the current measurement signal input terminal IAP of the metering chip and one end of a capacitor C28, the other end of the resistor R23 and the other end of the capacitor C28 are grounded, the other end of the phase current transformer is respectively connected to one end of a resistor R25 and one end of a resistor R24, the other end of the resistor R25 is respectively connected to the current measurement signal input terminal IAN of the metering chip and one end of a capacitor C32, the other end of the resistor R24 ​​and the other end of the capacitor C32 are grounded, and the output end of the metering chip is connected to the main control circuit.

[0084] Furthermore, the intelligent circuit breaker includes a leakage detection circuit, and the leakage detection circuit includes a zero-sequence current transformer.

[0085] See also Fig.16One end of the zero-sequence current transformer is respectively connected to one end of the resistor R41, one end of the capacitor C44, the input end of the second filter circuit and one end of the second clamping circuit, the other end of the resistor R41 and the other end of the capacitor C44 are grounded, the other end of the second clamping circuit is grounded, the output end of the second filter circuit is connected to the input end of the second amplifier, and the output end of the second amplifier is connected to the input end LeakCurrent of the main control circuit.

[0086] Furthermore, one end of the zero-sequence current transformer is respectively connected to one end of the resistor R41, one end of the capacitor C44, one end of the resistor R37 and the first pole of the dual series switch diode D2, the other end of the resistor R41 and the other end of the capacitor C44 are grounded, the second pole and the third pole of the dual series switch diode D2 are grounded, the other end of the resistor R37 is respectively connected to one end of the capacitor C45 and one end of the resistor R38, the other end of the capacitor C45 is grounded, the other end of the resistor R38 is connected to the input end of the second amplifier, and the output end of the second amplifier is connected to the input end LeakCurrent of the main control circuit.

[0087] Further, one end of the zero-sequence current transformer is respectively connected to one end of the resistor R41, one end of the capacitor C44, one end of the resistor R37 and the first pole of the dual series switch diode D2, the other end of the resistor R41 and the other end of the capacitor C44 are grounded, the second pole and the third pole of the dual series switch diode D2 are grounded, the other end of the resistor R37 is respectively connected to one end of the capacitor C45 and one end of the resistor R38, the other end of the capacitor C45 is grounded, the other end of the resistor R38 is connected to the negative input end of the operational amplifier U2, the negative input end of the operational amplifier U2 is connected to one end of the resistor R34, the other end of the resistor R34 is connected to the output end of the operational amplifier U2, the positive input end of the operational amplifier U2 is grounded, the output end of the operational amplifier U2 is connected to one end of the inductor L2, the other end of the inductor L2 is respectively connected to one end of the resistor R42, one end of the capacitor C46 and the input end LeakCurrent of the main control circuit, the other end of the resistor R42 and the other end of the capacitor C46 are grounded.

[0088] Furthermore, a storage module and a clock module are provided on the main board, and the storage module and the clock module are electrically connected to the main control chip.

[0089] Furthermore, the main control chip adopts a processor.

[0090] Furthermore, the communication circuit includes a wired communication circuit, and the wired communication circuit is connected to the main control circuit. Furthermore, the wired communication circuit is an RS485 communication circuit.

[0091] Further, see Fig.10The RS485 communication circuit includes an isolator chip U6 and an RS485 communication chip. The isolator chip U6 is connected between the RS485 communication chip and the main control chip, and the RS485 communication chip is connected to the communication interface.

[0092] Furthermore, the mainboard is provided with a 485 isolation power supply circuit, which includes an isolation power module MUX1, whose input terminal is connected to a first voltage, and whose output terminal outputs a second voltage for supplying power to the RS485 communication chip.

[0093] Furthermore, the mainboard is provided with a wireless communication interface for connecting to a wireless communication chip (wireless communication board). The wireless communication interface is connected to the main control chip. The mainboard is provided with a power board interface.

[0094] Furthermore, a wireless communication board (Internet of Things module) may be fixed on the electronic housing. In this case, the circuit breaker of the utility model has a wireless communication function.

[0095] A wireless communication chip is arranged on the wireless communication board.

[0096] The Internet of Things module of this embodiment can be but is not limited to using a 4G Internet of Things card.

[0097] When the circuit breaker is not provided with a wireless communication board, the circuit breaker is electrically connected to a device with a wireless communication function (such as a circuit breaker with a wireless communication function or a separate gateway device) through a communication interface.

[0098] Furthermore, the electronic module 1 also includes an electric operation module for operating the circuit breaker body 3 to open and close.

[0099] See also Fig.11 The electronic module 1 of the utility model also includes a trip control circuit, which includes a driving chip U3 and a transistor MOS1. The input end of the driving chip U3 is connected to the output end of the main control circuit, the output end of the driving chip U3 is connected to the control electrode of the transistor MOS1, the first electrode of the transistor MOS1 is grounded, the second electrode of the transistor MOS1 is connected to the second pin of the connector J4 and the positive electrode of the diode D6, and the negative electrode of the diode D6 is connected to the voltage HVDC and the first pin of the connector J4.

[0100] The connector J4 is connected to the electric operation module, and the trip control circuit is used to control the power on or off of the electric operation module, and is used to control the tripping of the intelligent circuit breaker. The electric operation module can be, but is not limited to, an electromagnet.

[0101] Further, see Fig.12The circuit of the intelligent circuit breaker of the present invention also includes a PE loop detection circuit, which includes a current transformer T2 and an operational amplifier OPA. The first input end of the current transformer T2 is connected to the PE outlet side PE_OUT (the PE outlet side PE_OUT is connected to the circuit breaker housing), the second input end of the current transformer T2 is connected to the N line PE_C, the first output end of the current transformer T2 is respectively connected to one end of the resistor R4, one end of the capacitor C2, one end of the resistor R2 and the first pole of the dual series switch diode D1, the other end of the resistor R4 and the other end of the capacitor C2 are grounded, and the dual series switch diode D1 is grounded. The second and third electrodes of the transistor D1 are grounded, the other end of the resistor R2 is connected to one end of the capacitor C3 and one end of the resistor R3 respectively, the other end of the capacitor C3 is grounded, the other end of the resistor R3 is connected to the negative input terminal of the operational amplifier U1, the negative input terminal of the operational amplifier U1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the output terminal of the operational amplifier, the positive input terminal of the operational amplifier U1 is grounded, the output terminal of the operational amplifier U1 is connected to one end of the inductor L1, the other end of the inductor L1 is respectively connected to one end of the resistor R6, one end of the capacitor C5 and the input terminal CheckPE of the main control circuit, the other end of the resistor R6 and the other end of the capacitor C5 are grounded.

[0102] The first clamping circuit includes a dual series switching diode D1. The dual series switching diode D1 functions to clamp the voltage at a set value.

[0103] The resistor R2, the resistor R3 and the capacitor C3 form a filter circuit.

[0104] The PE loop detection circuit of the present invention can be used for monitoring water ingress into a circuit breaker. When water ingress occurs into the circuit breaker, the current transformer T2 can detect a current signal. The PE loop detection circuit of the present invention can also detect leakage.

[0105] Further, see Fig.13 The circuit of the intelligent circuit breaker of the present invention also includes a PE offline detection circuit, which includes an optical coupler UO1, a first input end of the optical coupler UO1 is connected to the first voltage HVDC via a resistor, a second input end of the optical coupler UO1 is connected to PE_IN, a first output end of the optical coupler UO1 is respectively connected to the first input end of the main control circuit, one end of the resistor R11 and one end of the capacitor C8, the other end of the resistor R11 is connected to the voltage VDD, the other end of the capacitor C8 is grounded, the second output end of the optical coupler UO1 is grounded, and PE_IN is connected to the ground.

[0106] The PE drop detection circuit is used to detect whether PE is connected. The principle of the PE drop detection circuit is: HVDC is the voltage after three-phase rectification and filtering, PE_IN is connected to the ground, CheckPE_Leak is the high and low level signal output by the optocoupler, and is sent to the MCU; when PE_IN is well grounded, there is a DC voltage of about 300V between HVDC and PE_IN, the optocoupler is turned on, CheckPE_Leak is a low level, otherwise it is a high level; MCU determines whether PE_IN is connected to the ground by detecting the high and low levels of CheckPE_Leak.

[0107] The power board is provided with a power circuit, and the power circuit is used to supply power to the circuit breaker. Fig.14 As shown. The power supply circuit includes a first power supply unit, a second power supply unit, a third power supply unit and a fourth power supply unit. The input end of the first power supply unit is connected to the power supply interface, and is used to convert the voltage output by the power supply interface (the voltage output by the rectifier board) into the voltage HVDC. The second power supply unit is used to convert the voltage HVDC into a 12V voltage, the third power supply unit is used to convert the 12V voltage into a 5V voltage, and the fourth power supply unit is used to convert the 5V voltage into a 3.3V voltage (such as VDD3.3V).

[0108] The panel is provided with a display circuit, and the panel is electrically connected to the main board. The display circuit includes a display screen, and the display circuit is as follows: Fig.15 shown.

[0109] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A data acquisition device for an intelligent circuit breaker, characterized in that: The invention comprises a bottom shell and a cover plate, wherein a phase current transformer for detecting current is installed in the bottom shell, and a through hole for passing an outgoing line or an incoming line of a circuit breaker body is provided on the bottom shell, and a data acquisition board is installed in the bottom shell, and the current transformer is electrically connected to the data acquisition board, and the data acquisition board is electrically connected with a terminal corresponding to the outgoing line terminal or the incoming line terminal of the circuit breaker body one by one, and the cover plate is located at the upper end of the data acquisition board and is fixedly connected to the bottom shell, and a first through hole for passing the terminal and the outgoing line or the incoming line is provided on the cover plate, and a through hole for passing the outgoing line or the incoming line is provided on the data acquisition board.

2. The data acquisition device according to claim 1, characterized in that: A phase current transformer is installed in the bottom shell, corresponding to the L-phase outgoing line or incoming line, and the phase current transformer surrounds the outside of the line through hole corresponding to the L-phase outgoing line or incoming line; or, Three phase current transformers are installed in the bottom shell, corresponding to the A, B, C three-phase outgoing or incoming lines respectively, and the three phase current transformers are respectively surrounded by the outside of the line through holes corresponding to the A, B, C three-phase outgoing or incoming lines.

3. The data acquisition device according to claim 2, characterized in that: A zero-sequence current transformer is also installed in the bottom shell. The zero-sequence current transformer surrounds the outside of the A, B, C three-phase lines and the neutral line. The zero-sequence current transformer is electrically connected to the data acquisition board.

4. The data acquisition device according to claim 3, characterized in that: A first accommodating groove for accommodating a phase current transformer is provided on the bottom wall of the bottom shell, and a second accommodating groove for accommodating a zero-sequence current transformer is provided on the bottom wall of the bottom shell.

5. The data acquisition device according to any one of claims 1 to 4, characterized in that: A hollow cylinder is provided on the bottom wall of the bottom shell, corresponding one to one with the wire through holes provided on the bottom wall of the bottom shell, and the hollow cylinder is communicated with the corresponding wire through holes.

6. The data acquisition device according to claim 1, characterized in that: A data transmission interface is provided on the data acquisition board, a second through hole for the data transmission interface to pass through is provided on the cover plate, a voltage sampling circuit is provided on the data acquisition board, an input end of the voltage sampling circuit is connected to a corresponding terminal, an output end of the voltage sampling circuit is connected to the data transmission interface, and the current transformer is electrically connected to the data transmission interface provided on the data acquisition board via a connector.

7. The data acquisition device according to claim 6, characterized in that: The voltage sampling circuit includes a resistor R7, a resistor R14 and a resistor R21 and capacitors C1, C2 and C3. The resistor R7 is connected in parallel with the capacitor C1, the resistor R14 is connected in parallel with the capacitor C2, the resistor R21 is connected in parallel with the capacitor C3, the first end of the resistor R7 is electrically connected to the A-phase terminal via a first voltage divider unit, the first end of the resistor R14 is electrically connected to the B-phase terminal via a second voltage divider unit, the first end of the resistor R21 is electrically connected to the C-phase terminal via a third voltage divider unit, the second end of the resistor R7, the second end of the resistor R14 and the second end of the resistor R21 are grounded, the first end of the resistor R7 is the A-phase voltage detection point, the first end of the resistor R14 is the B-phase voltage detection point, the first end of the resistor R21 is the C-phase voltage detection point, and the A-phase voltage detection point, the B-phase voltage detection point and the C-phase voltage detection point are connected to the data transmission interface on the data acquisition board.

8. The data acquisition device according to claim 1, characterized in that: The data acquisition board is provided with a temperature detection circuit for detecting the temperature of the terminal.

9. An intelligent circuit breaker, characterized in that: It comprises a circuit breaker body and a data acquisition device as claimed in any one of claims 1 to 8, wherein the data acquisition device is detachably connected to the circuit breaker body, and the terminal of the data acquisition device is inserted into the circuit breaker body and electrically connected to the output terminal or the input terminal of the circuit breaker body.

10. The intelligent circuit breaker according to claim 9, characterized in that: It also includes an electronic module, which is detachably connected to the circuit breaker body and the data acquisition device respectively; The electronic module is used to upload the data collected by the data collection device to the external networking device, and to receive and execute the instructions sent by the external networking device to manipulate the circuit breaker body to perform opening and closing operations.

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