A power carrier acquisition device signal transmission circuit protection method and system

Abstract

The application discloses a power carrier collection equipment signal sending circuit protection method and system, wherein the method comprises the following steps: when the load of a phase or multiple phases of a power grid is heavy, a detection unit compares the feedback voltage of a driving chip with a set threshold voltage, and outputs the comparison result to a main control unit to confirm the working state of the driving chip; the main control unit outputs a control signal to a switch network unit, and the switch network unit controls the working state of the driving chip by controlling the enable of the driving chip respectively. The application can guarantee the normal communication of the equipment as much as possible when the power grid environment is poor, has higher flexibility compared with the prior art, increases the working efficiency of the power collection equipment, and reduces the damage of the equipment caused by the heavy load of the power grid.

Description

Technical Field

[0001] This invention relates to the field of power data acquisition equipment technology, and in particular to a method and system for protecting the signal transmission circuit of a power line carrier acquisition device. Background Technology

[0002] With the widespread adoption of smart meters, more and more meters are no longer limited to metering electricity but also include data transmission capabilities. Power line carrier (PLC) is a leading application in this field due to its low cost, simple deployment, and high efficiency, making it a primary data transmission method in an increasingly larger market. However, due to regional differences and varying power grid quality, power data acquisition equipment often experiences heavy output loads. Most mainstream power data acquisition devices are equipped with overload protection, which temporarily shuts down data transmission to prevent burnout under excessive load when the load is too heavy. It also intermittently attempts to transmit data to monitor the power grid environment. The problem with this is that the power data acquisition equipment can only resume normal operation once the power grid environment improves. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a method and system for protecting the signal transmission circuit of a power line carrier acquisition device. This method effectively prevents the burnout of the driver chip and the inability of the device to communicate normally after triggering self-protection due to excessive load on the three-phase carrier device in the field.

[0004] The technical solution adopted in this invention is as follows:

[0005] A method for protecting the signal transmission circuit of a power line carrier acquisition device includes the following steps:

[0006] S1. When the load on one or more phases of the power grid is heavy, the detection unit compares the feedback voltage of the drive chip with the set threshold voltage, and outputs the comparison result to the main control unit to confirm the working status of the drive chip.

[0007] S2. The main control unit outputs a control signal to the switch network unit, and the switch network unit controls the working state of the driver chip by controlling the enable of the driver chip respectively.

[0008] Further, in step S2, the switch network unit sequentially shuts down the drive chips corresponding to phases A, B, C, AB, AC, and BC through three switch circuits until no new trigger protection event is detected, and sets the current state to the working state.

[0009] Furthermore, the detection unit is provided with a current feedback loop for detecting the current state of the power device. The signal input terminal of the current feedback loop is electrically connected to the driver chip to collect the overcurrent signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send the overcurrent signal.

[0010] Furthermore, the detection unit is equipped with a temperature feedback loop for detecting the current temperature state of the power device. The signal input terminal of the temperature feedback loop is electrically connected to the driver chip to collect an over-temperature signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send an over-temperature signal.

[0011] Furthermore, the main control unit includes an MCU chip.

[0012] A power line carrier acquisition device signal transmission circuit protection system includes:

[0013] The detection unit is used to detect whether the feedback voltage of the driver chip is higher than the set threshold voltage and record the comparison results.

[0014] The main control unit is used to confirm the working state of the driver chip based on the comparison results of the detection unit, and thus determine whether to adjust the working state of the driver chip.

[0015] The switching network unit is used to control the enable of the driver chip according to the control signal output by the main control unit, thereby controlling the working state of the driver chip.

[0016] Furthermore, the switch network unit includes three independent switch circuits. The main control unit can sequentially shut down the drive chips corresponding to phases A, B, C, AB, AC, and BC through the three switch circuits until no new trigger protection event is detected, and then set the current state to the working state.

[0017] Furthermore, the detection unit is provided with a current feedback loop for detecting the current state of the power device. The signal input terminal of the current feedback loop is electrically connected to the driver chip to collect the overcurrent signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send the overcurrent signal.

[0018] Furthermore, the detection unit is equipped with a temperature feedback loop for detecting the current temperature state of the power device. The signal input terminal of the temperature feedback loop is electrically connected to the driver chip to collect an over-temperature signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send an over-temperature signal.

[0019] Furthermore, the main control unit includes an MCU chip.

[0020] The beneficial effects of this invention are as follows:

[0021] Currently, mainstream power line carrier acquisition equipment triggers protection to shut down all outputs when the power grid environment is poor. This means that if even one phase triggers protection, all devices on all phase lines will be unable to communicate normally. This invention, however, can guarantee normal communication of the equipment to the greatest extent possible even in poor power grid environments. Compared with existing technologies, it offers greater flexibility, increases the working efficiency of power acquisition equipment, and reduces equipment damage caused by excessive power grid load. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the signal transmission circuit protection system of the power line carrier acquisition device of the present invention.

[0023] Figure 2 This is a schematic diagram of a detection unit circuit according to the present invention.

[0024] Figure 3 This is a schematic diagram of a switching network unit circuit according to the present invention.

[0025] Figure reference numerals: U13, U15, and U16 are operational amplifiers, and Q20 to Q22 are surface-mount transistors. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments are now described. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] Currently, mainstream power line carrier acquisition devices trigger protection to shut down all outputs when the power grid environment is poor. This means that if even one phase triggers the protection, all devices on all phase lines will be unable to communicate normally. Therefore, this embodiment provides a protection method for the signal transmission circuit of a power line carrier acquisition device, including the following steps:

[0029] S1. When the load on one or more phases of the power grid is heavy, the detection unit compares the feedback voltage of the drive chip with the set threshold voltage, and outputs the comparison result to the main control unit to confirm the working status of the drive chip.

[0030] S2. The main control unit outputs control signals to the switching network unit, which controls the operating state of the driver chip by enabling the driver chip. Specifically, as shown... Figure 1As shown, the switch network unit sequentially shuts down the drive chips corresponding to phases A, B, C, AB, AC, and BC through three switch circuits until no new trigger protection event is detected, and then sets the current state to the working state.

[0031] Preferably, the detection unit is provided with a current feedback loop for detecting the current state of the power device. The signal input terminal of the current feedback loop is electrically connected to the driver chip to collect the overcurrent signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send the overcurrent signal.

[0032] Preferably, the detection unit is provided with a temperature feedback loop for detecting the current temperature status of the power device. The signal input terminal of the temperature feedback loop is electrically connected to the driver chip to collect the over-temperature signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send the over-temperature signal.

[0033] Preferably, the main control unit can be implemented using an MCU chip, such as the ST8500 programmable power line communication modem system-on-chip.

[0034] Preferably, such as Figure 2 The diagram shows a circuit schematic of a detection unit, where U13, U15, and U16 are operational amplifiers. More preferably, U13, U15, and U16 can be SGM8750 operational amplifier chips.

[0035] Preferably, such as Figure 3 The diagram shows a circuit schematic of a switching network unit, where Q20 to Q22 are surface-mount transistors. More preferably, Q20 to Q22 can be SOT23-M packaged transistors.

[0036] Example 2

[0037] This embodiment is based on embodiment 1:

[0038] This embodiment provides a protection system for the signal transmission circuit of a power line carrier acquisition device, such as... Figure 1 As shown, it includes a main control unit, a detection unit, and a switch network unit. The detection unit is used to detect whether the feedback voltage of the driver chip is higher than a set threshold voltage and record the comparison result. The main control unit is used to confirm the working state of the driver chip based on the comparison result of the detection unit, thereby determining whether to adjust the working state of the driver chip. The switch network unit is used to control the enable of the driver chip according to the control signal output by the main control unit, thereby controlling the working state of the driver chip.

[0039] Preferably, the switch network unit includes three independent switch circuits. The main control unit can sequentially shut down the drive chips corresponding to phases A, B, C, AB, AC, and BC through the three switch circuits until no new trigger protection event is detected, and then set the current state to the working state.

[0040] Preferably, the detection unit is provided with a current feedback loop for detecting the current state of the power device. The signal input terminal of the current feedback loop is electrically connected to the driver chip to collect the overcurrent signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send the overcurrent signal.

[0041] Preferably, the detection unit is provided with a temperature feedback loop for detecting the current temperature status of the power device. The signal input terminal of the temperature feedback loop is electrically connected to the driver chip to collect the over-temperature signal, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send the over-temperature signal.

[0042] Preferably, the main control unit can be implemented using an MCU chip, such as the ST8500 programmable power line communication modem system-on-chip.

[0043] Preferably, such as Figure 2 The diagram shows a circuit schematic of a detection unit, where U13, U15, and U16 are operational amplifiers. More preferably, U13, U15, and U16 can be SGM8750 operational amplifier chips.

[0044] Preferably, such as Figure 3 The diagram shows a circuit schematic of a switching network unit, where Q20 to Q22 are surface-mount transistors. More preferably, Q20 to Q22 can be SOT23-M packaged transistors.

[0045] In summary, this invention can ensure normal communication of the equipment to the greatest extent possible when the power grid environment is poor. Compared with the prior art, it is more flexible, increases the working efficiency of power acquisition equipment, and reduces equipment damage caused by excessive power grid load.

[0046] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A protection method for the signal transmission circuit of a power line carrier acquisition device, characterized in that, Includes the following steps: S1. When the load on one or more phases of the power grid is heavy, the detection unit compares the feedback voltage of the drive chip with the set threshold voltage, and outputs the comparison result to the main control unit to confirm the working status of the drive chip. S2. The main control unit outputs a control signal to the switch network unit, and the switch network unit controls the working state of the driver chip by controlling the enable of the driver chip respectively; In step S2, the switch network unit sequentially shuts down the drive chips corresponding to phases A, B, C, AB, AC, and BC through three switch circuits until no new trigger protection event is detected, and sets the current state to the working state. The detection unit is equipped with a current feedback loop for detecting the current state of the power device. The signal input terminal of the current feedback loop is electrically connected to the driver chip to collect overcurrent signals, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send overcurrent signals.

2. The protection method for the signal transmission circuit of a power line carrier acquisition device according to claim 1, characterized in that, The detection unit is equipped with a temperature feedback loop for detecting the current temperature status of the power device. The signal input terminal of the temperature feedback loop is electrically connected to the driver chip to collect over-temperature signals, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send over-temperature signals.

3. The protection method for the signal transmission circuit of the power line carrier acquisition device according to claim 1, characterized in that, The main control unit includes an MCU chip.

4. A protection system for the signal transmission circuit of a power line carrier acquisition device, characterized in that, include: The detection unit is used to detect whether the feedback voltage of the driver chip is higher than the set threshold voltage and record the comparison results. The main control unit is used to confirm the working state of the driver chip based on the comparison results of the detection unit, and thus determine whether to adjust the working state of the driver chip. A switching network unit is used to control the enable of the driver chip according to the control signal output by the main control unit, thereby controlling the working state of the driver chip. The switching network unit includes three independent switching circuits. The main control unit can sequentially shut down the driving chips corresponding to phases A, B, C, AB, AC, and BC through the three switching circuits until no new trigger protection event is detected, and then set the current state to the working state. The detection unit is equipped with a current feedback loop for detecting the current state of the power device. The signal input terminal of the current feedback loop is electrically connected to the driver chip to collect overcurrent signals, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send overcurrent signals.

5. The power line carrier acquisition equipment signal transmission circuit protection system according to claim 4, characterized in that, The detection unit is equipped with a temperature feedback loop for detecting the current temperature status of the power device. The signal input terminal of the temperature feedback loop is electrically connected to the driver chip to collect over-temperature signals, and the signal output terminal is electrically connected to the signal input terminal of the main control unit to send over-temperature signals.

6. The power line carrier acquisition equipment signal transmission circuit protection system according to claim 4, characterized in that, The main control unit includes an MCU chip.

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