Auxiliary power supply circuit and device of online acquisition system

Abstract

The invention discloses an auxiliary power supply circuit and device of an online acquisition system, relates to the technical field of auxiliary power supply, and solves the problem that the existing acquisition device and electric energy meter cannot guarantee power supply when a three-phase line fails and is powered off. According to the scheme, the system is characterized by comprising a detection circuit, a storage battery, a battery charging circuit, an inverter circuit, a controller circuit and a power switching circuit, the controller circuit is connected with the detection circuit, the battery charging and discharging circuit, the inverter circuit and the power supply switching circuit, the battery charging circuit is connected with the storage battery, the storage battery is connected with the inverter circuit, the inverter circuit is connected with the power supply switching circuit, and the power supply switching circuit is connected with the acquisition device; wherein the power supply switching circuit comprises a normally-closed part and a normally-open part, the normally-closed part is used for conducting three-phase power supply voltage and the acquisition device / electric energy meter, and the normally-open part is used for conducting the inverter circuit and the acquisition device / electric energy meter; a circuit is arranged to monitor line faults and provide auxiliary power supply, and an uninterrupted power supply is provided for the device.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary power supply, and more specifically, to an auxiliary power supply circuit and device of an online acquisition system. Background Art

[0002] At present, data collection devices and electric energy meters are usually powered by three-phase power supply lines. When a three-phase line fails and causes a power outage or there is a planned power outage, the data collection devices and electric energy meters will fail to collect data due to lack of power, making it difficult to ensure 24-hour uninterrupted data collection, which affects the normal operation of the data collection system.

[0003] Therefore, the present application provides an auxiliary power supply circuit and device for an online acquisition system to solve the above problems. Summary of the invention

[0004] The purpose of this application is to provide an auxiliary power supply circuit and device for an online data acquisition system to solve the problem that the existing data acquisition devices and electric energy meters cannot guarantee power supply when a three-phase line fails and a power outage occurs; by setting a detection circuit, a battery, a battery charging circuit, an inverter circuit, a controller circuit and a power switching circuit, line faults are monitored and auxiliary power is provided to provide an uninterrupted power supply for the device.

[0005] The present application first provides an auxiliary power supply circuit for an online acquisition system, comprising: a detection circuit, a battery, a battery charging circuit, an inverter circuit, a controller circuit and a power switching circuit; the controller circuit is connected to the detection circuit, the battery charging and discharging circuit, the inverter circuit and the power switching circuit, the battery charging circuit is connected to the battery, the battery is connected to the inverter circuit, the inverter circuit is connected to the power switching circuit, and the power switching circuit is connected to the acquisition device; the detection circuit is used to detect the three-phase power supply voltage and the inverter output voltage, the battery charging circuit is used to access the three-phase power supply voltage, and the power switching circuit is used to provide auxiliary power for the acquisition device / electric energy meter; wherein the power switching circuit comprises a normally closed part and a normally open part, the normally closed part is used to conduct the three-phase power supply voltage and the acquisition device / electric energy meter, and the normally open part is used to conduct the inverter circuit and the acquisition device / electric energy meter.

[0006] By adopting the above technical solution, when the three-phase power supply voltage is cut off, the inverter circuit starts to work, and after the output voltage of the inverter circuit is normal, the relay of the power switching circuit is controlled to operate, disconnecting the original circuit and connecting the inverter circuit to the output. On the one hand, it can prevent the phenomenon of reverse power supply, and on the other hand, it can ensure that the collection device / electricity meter is online 24 hours a day.

[0007] In one possible implementation, the power switching circuit includes a relay drive circuit and multiple relays; the input end of the relay drive circuit of the normally closed part is connected to the controller circuit, and the output end is connected to the drive end of each relay, the input end of the relay is connected to the three-phase power supply voltage, and the output end is connected to the collection device / electricity meter; the input end of the relay drive circuit of the normally open part is connected to the controller circuit, and the output end is connected to the drive end of each relay, the input end of the relay is connected to the inverter circuit, and the output end is connected to the collection device / electricity meter.

[0008] In a possible implementation, the controller circuit includes a microcontroller U13 and a light-emitting diode OP2, the microcontroller U13 is connected to the light-emitting diode OP2, the light-emitting diode OP2 is used to be constantly lit when the power switching circuit conducts the three-phase power supply voltage and the collection device / electricity meter, to flash slowly when the power switching circuit conducts the inverter circuit and the collection device / electricity meter, and to flash quickly when the detection circuit detects an inverter circuit output fault or a battery undervoltage.

[0009] In a possible implementation, a power supply circuit is further included, and the power supply circuit supplies power to the controller circuit, the detection circuit, the inverter circuit, and the power switching circuit.

[0010] In a possible implementation, the battery charging circuit includes a rectifier bridge BD1 and an AC / DC converter U1, which are used to convert a 220VAC supply voltage into a 12VDC voltage to charge the battery.

[0011] In a possible implementation, the inverter circuit includes a DC-AC control regulator U9 for converting the DC voltage provided by the battery into a 220VAC voltage.

[0012] In a possible implementation manner, the battery is a lead-acid battery.

[0013] The present application also provides an auxiliary power supply device for an online acquisition system, comprising: a housing, input terminals and output terminals disposed on the surface of the housing, the input terminals being used to connect a three-phase power supply line, and the output terminals being used to connect an acquisition device; and an auxiliary power supply circuit for the online acquisition system disposed inside the housing.

[0014] In a possible implementation, the detection circuit, the battery charging circuit, the inverter circuit, the controller circuit and the power switching circuit in the auxiliary power supply circuit are integrated on the same circuit board.

[0015] In a possible implementation, the interior of the shell is divided into two cavities, the circuit board is fixed in any one cavity inside the shell, and the battery is placed in the other cavity fixed inside the shell.

[0016] Compared with the prior art, the present application has the following beneficial effects: when a power outage occurs, the device will invert and output a 220V AC voltage to power the collection device and the electric energy meter, and cut off the original collection signal wiring to prevent reverse power supply; when the line resumes power supply, it will switch back to the original collection signal line and charge the device to ensure that the collection device and the electric energy meter are always in a power supply state, ensuring that the collection device is online 24 hours a day. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0018] Figure 1 It is the circuit schematic diagram of the auxiliary power supply circuit of the online acquisition system;

[0019] Figure 2 It is the control logic diagram of the auxiliary power supply circuit of the online acquisition system;

[0020] Figure 3 Circuit diagram of the controller circuit and wiring terminals;

[0021] Figure 4 Circuit diagram for battery charging circuit;

[0022] Figure 5 is a circuit diagram of a power switching circuit;

[0023] Figure 6 A circuit diagram of a detection circuit;

[0024] Figure 7 is a circuit diagram of an inverter circuit;

[0025] Figure 8 A circuit diagram of the power supply circuit;

[0026] Fig. 9 This is the appearance structure diagram of the auxiliary power supply device of the online acquisition system. DETAILED DESCRIPTION

[0027] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of the function, operation or element applied for, and does not limit the increase of one or more functions, operations or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or the possibility of increasing one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items.

[0028] It should be noted that if it is described that one component element is “connected” to another component element or is “connected to” another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element or is “directly connected to” another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0029] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with examples and drawings. The illustrative implementation scheme of the present application and its description are only used to explain the present application and are not intended to limit the present application.

[0030] See also Figure 1-2 As shown, Figure 1 This is the circuit schematic diagram of the auxiliary power supply circuit of the online acquisition system. Figure 2 The control logic diagram of the auxiliary power supply circuit of the online acquisition system. The auxiliary power supply circuit of the online acquisition system includes: a detection circuit, a battery, a battery charging circuit, an inverter circuit, a controller circuit and a power switching circuit; the controller circuit is connected to the detection circuit, the battery charging and discharging circuit, the inverter circuit and the power switching circuit, the battery charging circuit is connected to the battery, the battery is connected to the inverter circuit, the inverter circuit is connected to the power switching circuit, and the power switching circuit is connected to the acquisition device; the detection circuit is used to detect the three-phase power supply voltage and the inverter output voltage, the battery charging circuit is used to access the three-phase power supply voltage, and the power switching circuit is used to provide auxiliary power for the acquisition device / electric energy meter; wherein the power switching circuit includes a normally closed part and a normally open part, the normally closed part is used to conduct the three-phase power supply voltage and the acquisition device / electric energy meter, and the normally open part is used to conduct the inverter circuit and the acquisition device / electric energy meter.

[0031] Specifically, the power supply voltage of the electric energy meter and the collection device is detected in real time through the detection circuit. When the three-phase power supply voltage can supply power normally, the relay in the power switching circuit remains normally open or normally closed, and the three-phase power supply voltage supplies power to the collection device / electric energy meter. At the same time, the controller controls the battery charging and discharging circuit to charge the battery through the power supply voltage; when the three-phase power supply voltage is all off, the controller controls the inverter circuit to convert the battery power into 220VAC output, and controls the relay in the power switching circuit to operate, and the inverter circuit supplies power to the collection device / electric energy meter; when the three-phase power supply voltage resumes normal power supply, the relay in the power switching circuit resumes normally open or normally closed, and the three-phase power supply voltage continues to supply power to the collection device / electric energy meter.

[0032] The improvement of the present application lies in that when the three-phase power supply voltage is lost, the inverter circuit starts to work, and after the output voltage of the inverter circuit is normal, the relay of the power switching circuit is controlled to operate, the original circuit is disconnected and the inverter circuit is connected to the output at the same time. On the one hand, the phenomenon of reverse power supply can be prevented, and on the other hand, the data collection device / electricity meter can be ensured to be online 24 hours a day.

[0033] See also Figure 3-8 As shown, Figure 3-8 It is the circuit diagram of each module in the auxiliary power supply circuit.

[0034] In one possible implementation, the power switching circuit includes a relay drive circuit and multiple relays; the input end of the relay drive circuit of the normally closed part is connected to the controller circuit, and the output end is connected to the drive end of each relay, the input end of the relay is connected to the three-phase power supply voltage, and the output end is connected to the collection device / electricity meter; the input end of the relay drive circuit of the normally open part is connected to the controller circuit, and the output end is connected to the drive end of each relay, the input end of the relay is connected to the inverter circuit, and the output end is connected to the collection device / electricity meter.

[0035] Specifically, the relay in the power switching circuit is actuated to allow the energy meter and collector to switch seamlessly between the three-phase power supply voltage loop and the inverter circuit loop to ensure that the power supply to the collection device / energy meter is not interrupted.

[0036] In a possible implementation, the controller circuit includes a microcontroller U13 and a light-emitting diode OP2, the microcontroller U13 is connected to the light-emitting diode OP2, the light-emitting diode OP2 is used to be constantly lit when the power switching circuit conducts the three-phase power supply voltage and the collection device / electricity meter, to flash slowly when the power switching circuit conducts the inverter circuit and the collection device / electricity meter, and to flash quickly when the detection circuit detects an inverter circuit output fault or a battery undervoltage.

[0037] Specifically, the operator can quickly understand the power supply status of the external device by observing the state of the light-emitting diode OP2. When the power switching circuit conducts the three-phase power supply voltage and the collection device / electricity meter, the light-emitting diode OP2 is always on, indicating that the three-phase power supply voltage is supplying normally; when the power switching circuit conducts the inverter circuit and the collection device / electricity meter, the light-emitting diode OP2 flashes slowly, indicating that the external device is using the auxiliary power supply (battery) for power supply; when the detection circuit detects a fault in the inverter circuit output, the light-emitting diode OP2 flashes quickly, indicating that the device itself is faulty, and the inverter circuit cannot output 220VAC voltage, which needs to be checked immediately. In addition, the microcontroller U13 can use ARM's STM32 microcontroller, which has high-performance processing capabilities and can meet the use requirements of the device.

[0038] In a possible implementation, a power supply circuit is further included, and the power supply circuit supplies power to the controller circuit, the detection circuit, the inverter circuit, and the power switching circuit.

[0039] Specifically, the power supply circuit converts the device power supply voltage into 5V and 3.3V voltages to provide power support for various chips and devices in the device.

[0040] In a possible implementation, the battery charging circuit includes a rectifier bridge BD1 and an AC / DC converter U1, which are used to convert a 220VAC supply voltage into a 12VDC voltage to charge the battery.

[0041] Specifically, the battery charging circuit converts the 380V AC power provided by the three-phase power supply voltage line into a stable 220V DC power to charge the battery, ensuring that the battery has sufficient power. In addition, charging overcurrent, overvoltage, undervoltage, and overcharge protection functions can also be set.

[0042] In a possible implementation, the inverter circuit includes a DC-AC control regulator U9 for converting the DC voltage provided by the battery into a 220VAC voltage.

[0043] Specifically, when the three-phase power supply circuit fails (such as a power outage), the inverter circuit can invert the battery power and output an AC 220V voltage to power the collection device / electricity meter, thereby ensuring the normal operation of the collection device and the electricity meter.

[0044] In a possible implementation manner, the battery is a lead-acid battery.

[0045] Specifically, lead-acid batteries are used as energy storage units to provide auxiliary power support when the three-phase power supply circuit fails (such as a power outage). Lead-acid batteries have stable power, are resistant to high temperatures, are not prone to spontaneous combustion during operation, have high reliability and safety, and meet the safety requirements of the site. After the battery power decays, the battery power can be restored by adding sulfuric acid, which is convenient for long-term maintenance.

[0046] It can be understood that the device is composed of a detection circuit, a battery, a battery charging circuit, an inverter circuit, a controller circuit, a power switching circuit and a power supply circuit; the battery can mainly provide external power support when the three-phase power supply voltage fails (power outage); the battery charging circuit charges the battery when the power supply is restored to ensure that the battery is fully charged; the inverter circuit inverts the power of the battery during a power outage, and outputs an AC 220-volt voltage to power the collection device and the electric energy meter, ensuring the normal operation of the collection device and the electric energy meter; the processor circuit performs real-time online monitoring of the power supply voltage of the electric energy meter and the collection device. When the three-phase power supply voltage is simultaneously powered off, the inverter circuit is controlled to start working, and after the output voltage of the inverter circuit is normal, the relay in the power switching circuit is controlled to switch the circuit, connecting the inverter circuit and the output, and the control relay cuts off the original circuit to prevent the phenomenon of reverse power supply; when the city power voltage is restored to normal, the inverter circuit is controlled to stop working, and the control relay switches the power supply circuit of the electric energy meter and the collection device back to the original circuit, ensuring that the electric energy meter and the collector are online 24 hours a day.

[0047] See also Fig. 9 As shown, Fig. 9 The external structure diagram of the auxiliary power supply device of the online acquisition system. The auxiliary power supply device of the online acquisition system includes: a shell, input terminals and output terminals placed on the surface of the shell, the input terminals are used to connect the three-phase power supply line, and the output terminals are used to connect the acquisition device; and an auxiliary power supply circuit of the online acquisition system placed inside the shell.

[0048] When the device is in use, when the device is turned off, connect the three-phase power supply line to the input terminal, connect the power supply end of the acquisition device to the output terminal, check that the line is reliably and safely connected, and then turn on the device. The installation is simple and convenient. When the line is out of power, the device will invert and output 220V AC voltage to power the acquisition device and the electric energy meter, and cut off the original acquisition signal wiring to prevent reverse power supply. When the line resumes power supply, switch back to the original acquisition signal line and charge the device to ensure that the acquisition device and the electric energy meter are always in a power supply state, ensuring that the acquisition device is online 24 hours a day.

[0049] In a possible implementation, the detection circuit, battery charging circuit, inverter circuit, controller circuit and power switching circuit in the auxiliary power supply circuit are integrated into the same circuit board. The integrated circuit board can save space; in addition, the circuit board is treated with a three-proof coating process to prevent water fog, acid and salt, and prevent the circuit board and electronic components from corrosion and damage, thereby ensuring the service life and safe and stable operation of the device.

[0050] Furthermore, the inside of the shell is divided into two cavities, the circuit board is fixed in one cavity inside the shell, and the battery is placed in the other cavity fixed inside the shell. The circuit board and the battery are placed separately for easy daily management and maintenance; in addition, the shell can be made of flame-retardant ABS material, which is light and has high hardness and strength, protecting the battery and the circuit board from damage. Considering that the device is mostly used outdoors, the device shell can also be designed with a fully enclosed structure.

[0051] It should be noted that the device provided in this application can operate in low-power mode, is compact and portable, easy to install, adopts a high reliability and safety design, and can be maintenance-free for a long time; after mass production and commissioning, it can provide auxiliary power supply for the collection device and the electric energy meter to ensure 24-hour online operation.

[0052] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An auxiliary power supply circuit for an online acquisition system, characterized in that: include: Detection circuit, battery, battery charging circuit, inverter circuit, controller circuit and power switching circuit; The controller circuit is connected to the detection circuit, the battery charging and discharging circuit, the inverter circuit and the power switching circuit, the battery charging circuit is connected to the battery, the battery is connected to the inverter circuit, the inverter circuit is connected to the power switching circuit, and the power switching circuit is connected to the acquisition device; The detection circuit is used to detect the three-phase power supply voltage and the inverter output voltage, the battery charging circuit is used to access the three-phase power supply voltage, and the power switching circuit is used to provide auxiliary power supply for the collection device / electric energy meter; Among them, the power switching circuit includes a normally closed part and a normally open part, the normally closed part is used to conduct the three-phase power supply voltage and the collection device / electric energy meter, and the normally open part is used to conduct the inverter circuit and the collection device / electric energy meter.

2. The auxiliary power supply device of the online acquisition system according to claim 1, characterized in that: The power switching circuit includes a relay driving circuit and a plurality of relays; The input end of the relay drive circuit of the normally closed part is connected to the controller circuit, and the output end is connected to the drive end of each relay. The input end of the relay is connected to the three-phase power supply voltage, and the output end is connected to the collection device / electric energy meter; The input end of the relay drive circuit of the normally open part is connected to the controller circuit, and the output end is connected to the drive end of each relay. The input end of the relay is connected to the inverter circuit, and the output end is connected to the collection device / electric energy meter.

3. The auxiliary power supply device of an online acquisition system according to claim 1, characterized in that: The controller circuit includes a microcontroller U13 and a light emitting diode OP2. The microcontroller U13 is connected to the light emitting diode OP2. The light emitting diode OP2 is used to be always on when the power switching circuit conducts the three-phase power supply voltage and the collection device / electricity meter, flash slowly when the power switching circuit conducts the inverter circuit and the collection device / electricity meter, and flash quickly when the detection circuit detects an inverter circuit output fault or a battery undervoltage.

4. The auxiliary power supply device of an online acquisition system according to claim 1, characterized in that: It also includes a power supply circuit, which supplies power to the controller circuit, the detection circuit, the inverter circuit, and the power switching circuit.

5. The auxiliary power supply device of the online acquisition system according to claim 1, characterized in that: The battery charging circuit includes a rectifier bridge BD1 and an AC / DC converter U1, which are used to convert a 220VAC supply voltage into a 12VDC voltage for charging the battery.

6. The auxiliary power supply device of an online acquisition system according to claim 1, characterized in that: The inverter circuit includes a DC-AC control regulator U9, which is used to convert the DC voltage provided by the battery into a 220VAC voltage.

7. The auxiliary power supply device of an online acquisition system according to claim 1, characterized in that: The storage battery is a lead-acid storage battery.

8. An auxiliary power supply device for an online acquisition system, characterized in that: include: shell, An input terminal and an output terminal are arranged on the surface of the housing, the input terminal is used to connect a three-phase power supply line, and the output terminal is used to connect a collection device; as well as, An auxiliary power supply circuit of the online acquisition system is placed inside the housing.

9. The auxiliary power supply device of the online acquisition system according to claim 8, characterized in that: The detection circuit, battery charging circuit, inverter circuit, controller circuit and power switching circuit in the auxiliary power supply circuit are integrated on the same circuit board.

10. The auxiliary power supply device of the online acquisition system according to claim 9, characterized in that: The interior of the shell is divided into two cavities, the circuit board is fixed in any one cavity inside the shell, and the storage battery is placed in the other cavity fixed inside the shell. The circuit board and battery are placed separately to facilitate daily management and maintenance.

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