CN218567468U - Zero-live line detection electric energy meter of isolation system - Google Patents
Zero-live line detection electric energy meter of isolation system Download PDFInfo
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- CN218567468U CN218567468U CN202222596210.4U CN202222596210U CN218567468U CN 218567468 U CN218567468 U CN 218567468U CN 202222596210 U CN202222596210 U CN 202222596210U CN 218567468 U CN218567468 U CN 218567468U
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000002955 isolation Methods 0.000 title claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 31
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- 239000003990 capacitor Substances 0.000 claims description 22
- 238000012360 testing method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
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Abstract
The utility model discloses a zero line and live wire detection electric energy meter of an isolation system, which comprises an isolation power supply, a first voltage reduction circuit, a second voltage reduction circuit block, a master control module, a display module, an infrared communication module, a carrier communication module, a storage module, a metering module, a replaceable battery and a zero line and live wire detection module, wherein a live wire and a zero line are respectively connected into the isolation power supply, an isolation output end of the isolation power supply is electrically connected with the first voltage reduction circuit, the first voltage reduction circuit is connected with a floating ground, and an output end of the first voltage reduction circuit is respectively electrically connected with an input end of the zero line and live wire detection module, the display module, the infrared communication module, the carrier communication module and the storage module; the second output end of the isolation power supply is electrically connected with a second voltage reduction circuit, the second voltage reduction circuit is connected with a live wire ground, and the second voltage reduction circuit is electrically connected with the metering module; the main control module is electrically connected with the zero line and live wire detection module, the display module, the infrared communication module, the carrier communication module, the storage module, the metering module and the replaceable battery.
Description
Technical Field
The utility model belongs to the technical field of the electric energy meter, concretely relates to isolation system's zero live wire detects electric energy meter.
Background
In ac applications, it is sometimes required that the neutral and live lines are not connected in reverse, otherwise personal safety problems can result. Use test pencil earlier to test and distinguish zero line and live wire, use test pencil to detect zero line and live wire, can't satisfy the demand that equipment automation detected to there is the electric current to flow through the human body when using test pencil, there is the potential safety hazard. Later, the difference in potential between the ground wire and the live wire is detected to distinguish, and the method for detecting the difference in potential between the ground wire and the live wire requires the ground wire to be connected, so that the method cannot be used in the application occasions where the ground wire cannot be connected.
In non-isolated system application (the live wire is system ground or the zero line is system ground), by designing an antenna on a PCB, and using a potential difference signal between the antenna and the live wire or the zero line to detect the zero wire or the live wire, the whole detection system needs to be the zero line ground or the live wire ground, which cannot meet the requirement of system isolation, and because the design of the antenna on the PCB cannot be too far away from the zero line ground or the live wire ground, and the antenna cannot be designed too large, the detection signal is too weak, which is easy to misjudge.
SUMMERY OF THE UTILITY MODEL
In view of the problem that exists above, the utility model provides an isolated system's zero live wire detects electric energy meter does not need the access of ground wire, can realize the isolated system's zero live wire automatically and detect.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a zero line and live line detection electric energy meter of an isolation system comprises an isolation power supply, a first voltage reduction circuit, a second voltage reduction circuit block, a main control module, a display module, an infrared communication module, a carrier communication module, a storage module, a metering module, a replaceable battery and a zero line and live line detection module,
the live wire and the zero wire are respectively connected with an isolation power supply, the isolation output end of the isolation power supply is electrically connected with a first voltage reduction circuit, the first voltage reduction circuit is connected with the floating ground, and the output end of the first voltage reduction circuit is respectively electrically connected with the input ends of the live wire detection module, the display module, the infrared communication module, the carrier communication module and the storage module of the zero wire; the second output end of the isolation power supply is electrically connected with a second voltage reduction circuit, the second voltage reduction circuit is connected with a live wire ground, and the second voltage reduction circuit is electrically connected with the metering module; the main control module is electrically connected with the zero line and live wire detection module, the display module, the infrared communication module, the carrier communication module, the storage module, the metering module and the replaceable battery.
Preferably, the live neutral wire detection module includes: the first capacitor is connected with the live wire or the zero wire, the third resistor is connected with the other end of the first capacitor, the other end of the third resistor is connected with the base of one end of the first diode and the base of the first triode, the other end of the first diode is connected with the floating ground, the collector of the first triode is connected with one end of the first resistor and one end of the second resistor, the emitter of the first triode is connected with the base of the second triode, the collector of the second triode is connected with the other end of the first resistor, the emitter of the second triode is connected with the base of the third triode, the collector of the third triode is connected with the other end of the second resistor and one end of the fourth resistor, the emitter of the third triode is connected with one end of the floating ground and the second capacitor, and the other end of the fourth resistor is connected with the other end of the second capacitor and the main control module.
Preferably, the display module uses a segment code type LCD as a display screen, and a key is provided for switching display contents.
Preferably, the carrier communication module communicates by using a commercial power line.
Preferably, the storage module comprises an EEPROM chip for storing the electrical energy data and the configuration parameters.
Preferably, the storage module comprises a FLASH chip, and the FLASH chip is used for storing the load curve data.
Adopt the utility model discloses following beneficial effect has: the zero line and fire line detection of the isolation system can be automatically realized without the access of a ground wire, and compared with the defect that a too large PCB antenna cannot be designed in a zero line and fire line detection method of a non-isolation system, the antenna is more stable and reliable by using large-area copper paving on the floating ground, and the generated initial signal is stronger.
Drawings
Fig. 1 is a schematic structural diagram of a zero-live line detection electric energy meter of an isolation system according to an embodiment of the present invention;
fig. 2 is the embodiment of the utility model provides an embodiment zero line live wire detection module's circuit schematic diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, it is shown that the utility model discloses a structural schematic diagram of zero live wire detection electric energy meter of isolated system, including isolation power 101, first step-down circuit 102, second step-down circuit block 103, host system 111, display module 105, infrared communication module 106, carrier communication module 107, storage module 108, metering module 110, removable battery 109 and zero line live wire detection module 104, live wire L and zero line N insert isolation power 101 respectively, first step-down circuit 102 is connected to the isolation output electricity of isolation power 101, first step-down circuit 102 connects and floats the ground, zero line live wire detection module 104 is connected to the output electricity of first step-down circuit 102 respectively, display module 105, infrared communication module 106, carrier communication module 107, storage module 108's input; a second output end of the isolation power supply 101 is electrically connected with a second voltage-reducing circuit 103, the second voltage-reducing circuit 103 is connected with a live wire ground, and the second voltage-reducing circuit 103 is electrically connected with the metering module 110; the main control module 111 is electrically connected with the neutral wire and live wire detection module 104, the display module 105, the infrared communication module 106, the carrier communication module 107, the storage module 108, the metering module 110 and the replaceable battery 109. The battery is a backup power supply and is used for maintaining clock data after power failure. In the whole life cycle of the electric energy meter, the service life of the battery is relatively short, and the battery is a weak link in the service life of the whole electric energy meter, so that the service life of the whole electric energy meter can be prolonged by adopting the replaceable battery. The metering module 110 serves as a core module of the metering function of the electric energy meter, and provides electric energy metering information to the main control module, and all metering-related functions of the electric energy meter are realized based on data provided by the metering module. The metering module can use a V9381 chip, and after voltage and current signals sampled are processed, a UART interface is used for providing data processing for the MCU through optical coupling isolation.
In a specific application example, the MCU of the main control module 111 may use a V8530 chip, and mainly implements functions of a real-time clock, electric energy metering, a communication protocol, display data/communication data/storage data interaction, battery voltage detection, and zero-line and live-line detection and judgment.
In a specific application example, the isolated power source 101 may be a switching power source, for example, 8234T is used for a switching power chip. After alternating voltage is rectified and filtered by a rectifier bridge, energy is stored by a high-voltage electrolytic capacitor, a high-voltage MOS is arranged in a switch power supply chip 8234T to control the on and off of the current of a primary coil of the high-frequency transformer, and the energy of the primary coil is output to two secondary coils. The first buck circuit can use LDO LM1117-3.3 to buck, and the second buck circuit can use SGM2203-3.3 to buck.
The utility model discloses an in the embodiment, display module uses segment code formula LCD as the display screen, sets up a button and is used for showing the switching of content. The LCD primarily provides a display of power, voltage, current, power factor, time, date, communication status, and hot and cold wire wiring status.
In an embodiment of the present invention, the infrared communication module utilizes infrared rays as a transmission medium for performing point-to-point meter reading by using a palm computer. The carrier communication module utilizes the commercial power electric wire to communicate, networking can be achieved without extra wiring, and remote meter reading can be achieved more conveniently.
The utility model discloses a storage module includes the EEPROM chip in the embodiment, and the EEPROM chip is used for saving electric energy data and configuration parameter. The storage module comprises a FLASH chip, and the FLASH chip is used for storing load curve data.
In a specific application example, the EEPROM of the storage module may use an AT24C256 chip, and the Flash may use an FM25Q32 chip.
The utility model discloses an in the embodiment, see FIG. 2, zero line live wire detection module includes: the first capacitor C1 is connected with a live wire L or a zero wire N, the other end of the first capacitor C1 is connected with a third resistor R3, the other end of the third resistor R3 is connected with one end of a first diode D1 and the base electrode of the first triode Q1, the other end of the first diode D1 is connected with a floating ground, the collector electrode of the first triode Q1 is connected with one ends of the first resistor R1 and the second resistor R2, the emitter electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, the collector electrode of the second triode Q2 is connected with the other end of the first resistor R1, the emitter electrode of the second triode Q2 is connected with the base electrode of the third triode Q3, the collector electrode of the third triode Q3 is connected with the other end of the second resistor R2 and one end of a fourth resistor R4, the emitter electrode of the third triode Q3 is connected with one end of the floating ground and one end of the second capacitor C2, and the other end of the fourth resistor R4 is connected with the main control module.
Since the detection system is isolated from strong electricity, the system ground is floating, and a large-area copper laying area is needed systematically, and a large and stable parasitic capacitance C can be generated between the large-area copper laying area and the ground. Since the potential difference between the live line and the ground is large, a weak ac path can be formed when J1 is connected to the live line.
The J1 interface of the zero line and live wire detection module is connected with the live wire, the C1 capacitor uses a Y1 safety capacitor and is used for the safety isolation and voltage reduction and current limiting functions of a strong electric system and a floating ground system, the resistor R3 is used for current limiting and interference absorption, and in order to reduce the influence of external interference, the wiring between the capacitor C1 and the triode Q1 needs to be as short as possible; the diode D1 is matched with the emitter junction of the triode Q1, the emitter junction of the triode Q2 and the emitter junction of the triode Q3 to charge and discharge the capacitor C1 and the parasitic capacitor C, so that the capacitor C1 and the parasitic capacitor C are not always in a charging state to cause circuit failure; the triode Q1 and the triode Q2 are used for carrying out current amplification processing on the weak current signal flowing through the capacitor C1 and finally controlling the triode Q3 to output a voltage signal at the collector; the resistor R1 is used for limiting the current of the collector of the triode Q2, and the resistor R2 is used for limiting the current of the collector of the triode Q3; the resistor R4 and the capacitor C2 form an RC filter circuit to absorb interference, and meanwhile, the resistor R2 is matched, so that square wave signals output by the triode Q3 are converted into stable low-level signals through proper parameter selection, MCU detection is facilitated, and program design is simplified.
If the J1 interface is connected with a zero line, no current flows through the C1 capacitor, the triode Q1, the triode Q2 and the triode Q3 are not conducted, and the collector of the triode Q3 outputs a stable high level.
It is to be understood that the exemplary embodiments described herein are illustrative and not restrictive. While one or more embodiments of the present invention have been described in connection with the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (6)
1. A zero line and live line detection electric energy meter of an isolation system is characterized by comprising an isolation power supply, a first voltage reduction circuit, a second voltage reduction circuit block, a main control module, a display module, an infrared communication module, a carrier communication module, a storage module, a metering module, a replaceable battery and a zero line and live line detection module,
the live wire and the zero wire are respectively connected with an isolation power supply, the isolation output end of the isolation power supply is electrically connected with a first voltage reduction circuit, the first voltage reduction circuit is connected with the floating ground, and the output end of the first voltage reduction circuit is respectively electrically connected with the input ends of the live wire detection module, the display module, the infrared communication module, the carrier communication module and the storage module of the zero wire; the second output end of the isolation power supply is electrically connected with a second voltage reduction circuit, the second voltage reduction circuit is connected with a live wire ground, and the second voltage reduction circuit is electrically connected with the metering module; the main control module is electrically connected with the zero line and live wire detection module, the display module, the infrared communication module, the carrier communication module, the storage module, the metering module and the replaceable battery.
2. The zero line detection electric energy meter of the isolation system of claim 1, wherein the zero line and live line detection module comprises: the first capacitor is connected with the live wire or the zero wire, the third resistor is connected with the other end of the first capacitor, the other end of the third resistor is connected with the base of one end of the first diode and the base of the first triode, the other end of the first diode is connected with the floating ground, the collector of the first triode is connected with one end of the first resistor and one end of the second resistor, the emitter of the first triode is connected with the base of the second triode, the collector of the second triode is connected with the other end of the first resistor, the emitter of the second triode is connected with the base of the third triode, the collector of the third triode is connected with the other end of the second resistor and one end of the fourth resistor, the emitter of the third triode is connected with one end of the floating ground and the second capacitor, and the other end of the fourth resistor is connected with the other end of the second capacitor and the main control module.
3. The zero-live line detection electric energy meter of the isolation system as claimed in claim 1, wherein the display module uses a segment code type LCD as a display screen, and a key is provided for switching the display contents.
4. The zero-live line detection electric energy meter of the isolation system of claim 1, wherein the carrier communication module communicates using a mains power line.
5. The zero and live line detection electric energy meter of the isolation system as recited in claim 1, wherein the storage module comprises an EEPROM chip for storing electric energy data and configuration parameters.
6. The zero line and live line detection electric energy meter of the isolation system of claim 1, wherein the storage module comprises a FLASH chip for storing load curve data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222596210.4U CN218567468U (en) | 2022-09-29 | 2022-09-29 | Zero-live line detection electric energy meter of isolation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222596210.4U CN218567468U (en) | 2022-09-29 | 2022-09-29 | Zero-live line detection electric energy meter of isolation system |
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| Publication Number | Publication Date |
|---|---|
| CN218567468U true CN218567468U (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222596210.4U Active CN218567468U (en) | 2022-09-29 | 2022-09-29 | Zero-live line detection electric energy meter of isolation system |
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| CN (1) | CN218567468U (en) |
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- 2022-09-29 CN CN202222596210.4U patent/CN218567468U/en active Active
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