Power supply module for monitoring device

Abstract

A power supply module for a monitoring device comprises a power supply unit, the power supply unit comprises a rectifier, the input end of the rectifier is connected to a three-phase input port, and the three-phase input port is connected with an external power supply; the output end of the rectifier is connected with a power storage circuit and a power supply circuit which are connected in parallel, the power supply circuit is provided with a double-phase output port, and the power storage circuit and the power supply circuit are controlled through an mos tube; the electric power storage circuit comprises a super capacitor, the super capacitor is connected to the non-inverting input end of a comparator through a voltage sensor, the inverting input end of the comparator is connected to a 12V reference power supply, and the output of the comparator is connected to the G pole of the mos tube. Under the condition of normal power-on, the power supply unit can normally supply power to the monitoring unit and charge the super capacitor at the same time, and when accidental power-off occurs, the super capacitor can replace the power supply unit to complete power supply to the monitoring unit.

Description

Technical Field

[0001] The utility model relates to the technical field of power module circuit design, in particular to a power module for a monitoring device. Background Art

[0002] A conventional low-voltage distribution network feeder monitoring device needs to include a communication unit, a power supply module and multiple low-voltage monitoring units. In order to ensure the normal operation of the above-mentioned low-voltage monitoring units, the above-mentioned power supply module needs to be connected to the low-voltage monitoring units and provide them with voltage signals, DC power supply and field bus. Since the power supply module also needs to be powered through a three-phase input port, when a power outage occurs, the above-mentioned power supply module cannot provide voltage signals and DC power supply to the low-voltage monitoring unit, which will cause the low-voltage monitoring unit to be unable to monitor the operating status and equipment status of the low-voltage electrical circuit in a short period of time. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a power module for a monitoring device.

[0004] The technical solution of this utility model is as follows:

[0005] A power supply module for a monitoring device comprises a power supply unit, the power supply unit comprises a rectifier, and an input end of the rectifier is connected to a three-phase input port, and the three-phase input port is connected to an external power supply;

[0006] The output end of the rectifier is connected to a storage circuit and a power supply circuit connected in parallel, the power supply circuit is provided with a two-phase output port, and the storage circuit and the power supply circuit are controlled by a MOS tube;

[0007] The power storage circuit includes a super capacitor, which is connected to the same-direction input terminal of the comparator through a voltage sensor, the reverse input terminal of the comparator is connected to a 12V reference power supply, and the output of the comparator is connected to the G pole of the MOS tube.

[0008] When the power is on normally, the power supply unit can supply power normally. When an unexpected situation occurs, the supercapacitor can replace the power supply unit to complete the power supply to ensure normal operation for a period of time, and the power supply unit can also charge the supercapacitor.

[0009] In order to realize power supply to multiple monitoring units at the same time, the two-phase output port is connected to multiple monitoring units through a splitter.

[0010] The specific structure of the above-mentioned splitter is that the splitter includes a two-phase input port and multiple two-phase output ports, and the two-phase input port is connected to multiple two-phase input ports at the same time.

[0011] In order to facilitate the plugging of the terminals, the plurality of bidirectional output ports are arranged symmetrically.

[0012] As a preferred solution, the splitter can be provided in plurality, so as to connect as many monitoring units as possible on the basis of ensuring normal power supply voltage and current.

[0013] The specific model of the above comparator is, and the model of the comparator is LM393DR.

[0014] As a preferred solution, a grounding port is also provided at the three-phase input port.

[0015] The specific selection of the above-mentioned supercapacitor is that the output voltage of the supercapacitor is not less than 10V, and the output maintenance time is not less than 15 seconds.

[0016] In order to provide a short-circuit protection effect, the power supply circuit is provided with a short-circuit protection function.

[0017] In order to ensure normal load capacity, the output current of the power supply circuit is not less than 400mA.

[0018] The beneficial effect of the utility model is that the utility model is a power supply module for a monitoring device. Different from the existing structure, the power supply module can still provide voltage signals and DC current to the low-voltage monitoring module in the event of a short-term power outage. Therefore, the low-voltage monitoring module will not stop monitoring the operating status of the electrical circuit and the equipment status. The specific method is to add a supercapacitor to the circuit. Under normal circumstances, the three-phase input port can charge the supercapacitor and provide the low-voltage monitoring module with voltage signals and DC current through the power supply circuit of the voltage module. In the event of a power outage, the supercapacitor will use the power supply circuit to provide the low-voltage monitoring module with voltage signals and DC current in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.

[0020] In the attached picture:

[0021] Figure 1 This is a schematic diagram of the circuit structure of the power module of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the utility model splitter (front view);

[0023] Figure 3 This is a schematic diagram of the structure of the utility model splitter (rear view);

[0024] The components represented by the reference numerals in the figure are:

[0025] 1. Current source; 2. Supercapacitor; 3. Voltage sensor; 4. Comparator; 5. MOS tube. DETAILED DESCRIPTION

[0026] A power supply module for a monitoring device, the circuit structure of which is as follows Figure 1 As shown, it includes a power supply unit, which includes a rectifier. The rectifier can convert AC power into DC power that can power the low-voltage monitoring unit. For this purpose, the input end of the rectifier is connected to a three-phase input port, and the three-phase input port is connected to an external AC power supply. For safety considerations, a grounding port is also provided at the three-phase input port.

[0027] Afterwards, the output end of the rectifier is connected to a storage circuit and a power supply circuit connected in parallel, wherein the storage circuit is used to store electricity and can discharge electricity at the same time, and the storage and discharge do not require manual control.

[0028] In the above structure, the power supply circuit is provided with a two-phase output port and is used to output direct current. Moreover, in order to realize the automatic switching of the above storage and discharge, the storage circuit and the power supply circuit are controlled by the MOS tube 5.

[0029] In order to realize power storage and discharge, the power storage circuit includes a super capacitor 2, the super capacitor 2 is connected to the same direction input end of the comparator 4 through the voltage sensor 3, the reverse input end of the comparator 4 is connected to the 12V reference power supply, and the output of the comparator 4 is connected to the G pole of the mos tube 5. Through the setting of the comparator 4, it is possible to control whether to supply power to the super capacitor 2. Moreover, the design of the mos tube 5 can be automatically switched in the circuit, so that after power failure, the power storage circuit can discharge autonomously. Moreover, after power is restored, the mos tube can control the power supply capacitor to charge the super capacitor 2, and the start and stop of charging depends on the comparator 4. Therefore, after using the above circuit, it is only necessary to connect the three-phase input port to the external power supply, and connect the two-phase output port to the low-voltage monitoring unit, and then the low-voltage monitoring unit can be powered. Moreover, even if the external power supply is temporarily powered off, the power supply module can still supply power normally for a period of time to maintain the operation of the voltage monitoring unit, and the above power storage does not require additional circuit settings, and the same set of circuits can be used at the same time. The speed of switching the power on and off is uncontrollable and very fast, so it is impossible to manually switch the storage and discharge. However, the above problem can be effectively solved through the application of comparators and MOS tubes.

[0030] And in the above structure, the specific model of the above comparator 4 is, the model of the comparator 4 is LM393DR.

[0031] Afterwards, the specific selection of the super capacitor 2 is that the output voltage of the super capacitor 2 is not less than 10V, and the output maintenance time is not less than 15 seconds. The specific selection can be based on actual needs.

[0032] In order to provide a short-circuit protection effect, the power supply circuit is provided with a short-circuit protection function.

[0033] In order to ensure normal load capacity, the output current of the power supply circuit is not less than 400mA.

[0034] The above structure can be used to realize that, when the power is normally on, the power supply unit can supply power normally. When an unexpected situation occurs, the supercapacitor 2 can replace the power supply unit to complete the power supply to ensure normal operation for a period of time, and the power supply unit can also charge the supercapacitor 2. The above switching process is not performed by the staff, but the above circuit switches automatically, so no human monitoring is required, and it has important application significance for short-term power outages.

[0035] Since multiple low-voltage monitoring units need to be set up, in order to realize the simultaneous power supply of multiple monitoring units, the two-phase output port is connected to multiple monitoring units through a splitter, and Figure 2-3 As shown, the specific structure of the above splitter is that the splitter includes a two-phase input port and multiple two-phase output ports, and the two-phase input port is connected to multiple two-phase input ports. In the above structure, in order to facilitate the plugging of terminals, the multiple two-way output ports are arranged symmetrically.

[0036] When a single splitter cannot be equipped with a corresponding number of low-voltage monitoring units, cascade diffusion connection can be continued, that is, the splitter can be equipped with multiple ones. On the basis of ensuring normal power supply voltage and current, as many monitoring units as possible can be connected.

Claims

1. A power module for a monitoring device, characterized in that: A power supply unit is included, wherein the power supply unit includes a rectifier, and an input end of the rectifier is connected to a three-phase input port, and the three-phase input port is connected to an external power source; The output end of the rectifier is connected to a storage circuit and a power supply circuit connected in parallel, the power supply circuit is provided with a two-phase output port, and the storage circuit and the power supply circuit are controlled by a MOS tube (5); The power storage circuit comprises a super capacitor (2), the super capacitor (2) is connected to the same direction input end of a comparator (4) through a voltage sensor (3), the reverse input end of the comparator (4) is connected to a 12V reference power supply, and the output of the comparator (4) is connected to the G pole of a MOS tube (5).

2. A power module for a monitoring device according to claim 1, characterized in that: The bi-phase output port is connected to multiple monitoring units through a splitter.

3. A power module for a monitoring device according to claim 2, characterized in that: The splitter includes a bi-phase input port and a plurality of bi-phase output ports, and the bi-phase input port is connected to a plurality of bi-phase input ports at the same time.

4. A power module for a monitoring device according to claim 3, characterized in that: The plurality of dual-phase output ports are arranged symmetrically.

5. A power module for a monitoring device according to claim 2, characterized in that: The line splitter may be provided in plurality.

6. A power module for a monitoring device according to claim 1, characterized in that: The model of the comparator (4) is LM393DR.

7. A power module for a monitoring device according to claim 1, characterized in that: A grounding port is also provided at the three-phase input port.

8. A power module for a monitoring device according to claim 1, characterized in that: The output voltage of the supercapacitor (2) is not less than 10V, and the output maintenance time is not less than 15 seconds.

9. A power module for a monitoring device according to claim 1, characterized in that: The power supply circuit is provided with a short circuit protection function.

10. A power module for a monitoring device according to any one of claims 1 to 9, characterized in that: The output current of the power supply circuit is not less than 400mA.

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