Relay switching-on and switching-off device of single-phase intelligent meter for recovering magnetic field interference

Abstract

The utility model discloses a relay switching-on and switching-off device of a single-phase intelligent meter for recovering magnetic field interference, relates to the technical field of intelligent electric meters, and aims to solve the problems that the internal push lever of a relay in a current intelligent electric meter is easily influenced by an external magnetic field, so that illegal switching-on and switching-off actions are caused, and after the external magnetic field is moved away, the switching-on and switching-off actions are influenced. The utility model solves the technical problem that the relay in the intelligent electric meter is still in an illegal state, and comprises a Hall sensor MU1 arranged in the relay in the intelligent electric meter, and the Hall sensor MU1 is provided with a third pin OUT end which is used for being influenced by an external magnetic field to convert and output a high level and a low level. And after the magnetic field is moved away, the relay is driven again, so that the relay is recovered to a switching-off or switching-on state before being interfered by the external magnetic field, and the influence of the external magnetic field on the relay is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of smart electric meters, and more specifically to a relay closing and closing device for recovering a single-phase smart meter disturbed by a magnetic field. Background Art

[0002] Smart meters are one of the basic devices for data collection in smart grids (especially smart distribution networks). They are responsible for collecting, measuring and transmitting raw power data, and are the basis for information integration, analysis optimization and information presentation. In addition to the basic electricity consumption metering function of traditional energy meters, smart meters also have two-way multi-rate metering functions, user-side control functions, two-way data communication functions in multiple data transmission modes, and anti-electricity theft functions in order to adapt to the use of smart grids and new energy. At present, built-in relays have become standard for smart meters, which are used for flexible load control and the realization of prepayment functions.

[0003] However, due to the functional characteristics of the relay itself, the current flows through the internal coil of the relay to generate a magnetic field to drive the internal pusher of the relay, thereby realizing the opening or closing of the relay. Therefore, the relay itself has a defect, that is, the internal pusher of the relay is also susceptible to the external magnetic field, which leads to illegal opening or closing actions. Even if the external magnetic field is removed, the relay of the meter is still in an illegal state. Especially in overseas markets, where electricity theft is more serious, the external magnetic field can change the state of the relay without leaving any traces of illegal operation after the operation is interfered by the operation. This defect has a great impact on the function of smart meters. For example, a family user has a power outage due to arrears. At this time, the relay in the meter is in a closed state. However, the user can illegally close the relay by interfering with the outside of the meter with a magnet to achieve the effect of continuing to use electricity. In view of this, we propose a relay opening and closing device for restoring a single-phase smart meter interfered by a magnetic field. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art, meet the actual needs, and provide a relay opening and closing device for restoring a single-phase smart meter disturbed by a magnetic field, so as to solve the technical problem that the internal push and pull of the relay in the current smart meter is easily affected by the external magnetic field, resulting in illegal opening and closing actions, and after the external magnetic field is removed, the relay in the smart meter is still in an illegal state.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a relay closing and closing device for recovering a single-phase smart meter disturbed by a magnetic field, comprising a Hall sensor MU1 built into a relay in the smart meter;

[0006] The Hall sensor MU1 has a third pin OUT end for changing the output high and low levels under the influence of an external magnetic field, and the third pin OUT end of the Hall sensor MU1 is electrically connected to the LVD end of the MCU, and the third pin OUT end of the Hall sensor MU1 is connected in parallel with a resistor MR1 and a capacitor MC2.

[0007] The utility model adds a Hall sensor MU1 on the main board of the smart meter at the relay to detect the application and removal of the external magnetic field conditions of the smart meter, and outputs a feedback level to the LVD end through the OUT end of the third pin of the Hall sensor MU1, and then collects the feedback level of the LVD end through the MCU in the smart meter to judge the application and removal of the magnetic field outside the smart meter. After the magnetic field is removed, the relay is re-driven to restore it to the open or closed state before being disturbed by the external magnetic field, so as to reduce the influence of the external magnetic field on it.

[0008] Preferably, the VDD terminal of the first pin of the Hall sensor MU1 is electrically connected to the VMAG terminal.

[0009] Preferably, the VDD end of the first pin of the Hall sensor MU1 is further connected to a capacitor MC3, and the other end of the capacitor MC3 is connected to the ground electrode.

[0010] Preferably, the GND end of the second pin of the Hall sensor MU1 is connected to the ground electrode.

[0011] Preferably, the other end of the resistor MR1 is electrically connected to the VMAG end, and the other end of the capacitor MC2 is connected to the ground electrode.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model adds a Hall sensor MU1 on the main board of the smart meter at the relay to detect the application and removal of the external magnetic field conditions of the smart meter, and outputs a feedback level to the LVD end through the OUT end of the third pin of the Hall sensor MU1, and then collects the feedback level of the LVD end through the MCU in the smart meter to determine the application and removal of the magnetic field outside the smart meter. After the magnetic field is removed, the relay is re-driven to restore it to the open or closed state before being disturbed by the external magnetic field, so as to reduce the influence of the external magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the circuit principle diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the process of the automatic recovery function in the utility model. DETAILED DESCRIPTION

[0016] like Figure 1 , Figure 2 As shown, the utility model relates to a relay closing and closing device for recovering a single-phase smart meter disturbed by a magnetic field, comprising a Hall sensor MU1 built into a relay in the smart meter;

[0017] In an embodiment of the utility model, the Hall sensor MU1 has a third pin OUT end for changing the output high and low levels under the influence of an external magnetic field, and the third pin OUT end of the Hall sensor MU1 is electrically connected to the LVD end of the MCU, and the third pin OUT end of the Hall sensor MU1 is connected in parallel with a resistor MR1 and a capacitor MC2, the other end of the resistor MR1 is electrically connected to the VMAG end, and the other end of the capacitor MC2 is connected to the ground electrode. By adding a Hall sensor MU1 to the main board of the smart meter at the relay to detect the application and removal of the external magnetic field conditions of the smart meter, and outputting a feedback level to the LVD end through the third pin OUT end of the Hall sensor MU1, and then collecting the feedback level of the LVD end through the MCU in the smart meter, the application and removal of the magnetic field outside the smart meter are judged. After the magnetic field is removed, the relay is re-driven to restore it to the open or closed state before being disturbed by the external magnetic field, so as to reduce its influence by the external magnetic field.

[0018] In the embodiment of the present invention, the first pin VDD end of the Hall sensor MU1 is electrically connected to the VMAG end, the first pin VDD end of the Hall sensor MU1 is also connected to a capacitor MC3, and the other end of the capacitor MC3 is connected to the ground electrode.

[0019] In the embodiment of the present utility model, the GND end of the second pin of the Hall sensor MU1 is connected to the ground electrode.

[0020] Working principle: This embodiment provides a relay closing device for recovering a single-phase smart meter disturbed by a magnetic field, such as Figure 2 , combined with the feedback level output by the Hall sensor MU1 to the LVD end, the feedback level of the LVD end is collected in real time through the MCU in the smart meter to realize the automatic recovery function process of relay d1:

[0021] In stage A, the Status value of the original relay status is recorded and maintained through the RAM of the smart meter main MCU;

[0022] (1) 0x00 represents the relay closing state;

[0023] (2) 0x5A represents the relay disconnection state;

[0024] In stage B, the main MCU of the smart meter detects the feedback level changes of the LVD end in real time;

[0025] When there is no external magnetic field interference, the meter is always in stage B, and the LVD level is always high;

[0026] If the LVD terminal detects a low level due to interference from an external magnetic field, it means that the relay state is interfered with and illegally operates, and the detection enters stage C.

[0027] In stage C, the main MCU of the smart meter detects in real time whether the feedback level of the LVD end becomes high level;

[0028] If the main MCU of the smart meter detects that the feedback level of the LVD terminal becomes high, it means that the current external magnetic field interference has been removed and enters the D stage;

[0029] In stage D, the relay operation is re-executed according to the original relay status value stored in the RAM of the main MCU of the smart meter in stage A;

[0030] If Status=0x00, re-execute the closing operation;

[0031] If Status = 0x5A, the switch-off operation is performed again, so that the relay state automatically returns to the state of stage A.

[0032] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A relay closing device for recovering a single-phase smart meter disturbed by a magnetic field, characterized in that: It includes a Hall sensor MU1 built into the relay of the smart meter; The Hall sensor MU1 has a third pin OUT end for changing the output high and low levels under the influence of an external magnetic field, and the third pin OUT end of the Hall sensor MU1 is electrically connected to the LVD end of the MCU, and the third pin OUT end of the Hall sensor MU1 is connected in parallel with a resistor MR1 and a capacitor MC2.

2. A relay closing device for recovering a single-phase smart meter disturbed by a magnetic field according to claim 1, characterized in that: The VDD terminal of the first pin of the Hall sensor MU1 is electrically connected to the VMAG terminal.

3. A relay closing and closing device for recovering a single-phase smart meter disturbed by a magnetic field according to claim 2, characterized in that: The VDD end of the first pin of the Hall sensor MU1 is also connected to a capacitor MC3, and the other end of the capacitor MC3 is connected to the ground electrode.

4. A relay closing and closing device for recovering a single-phase smart meter disturbed by a magnetic field according to claim 1, characterized in that: The GND end of the second pin of the Hall sensor MU1 is connected to the ground electrode.

5. A relay closing and closing device for recovering a single-phase smart meter disturbed by a magnetic field according to claim 1, characterized in that: The other end of the resistor MR1 is electrically connected to the VMAG terminal, and the other end of the capacitor MC2 is connected to the ground electrode.

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