CN219477658U - Uninterrupted power supply circuit - Google Patents
Uninterrupted power supply circuit Download PDFInfo
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- CN219477658U CN219477658U CN202223212386.1U CN202223212386U CN219477658U CN 219477658 U CN219477658 U CN 219477658U CN 202223212386 U CN202223212386 U CN 202223212386U CN 219477658 U CN219477658 U CN 219477658U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model provides a circuit for uninterrupted power supply, which comprises a first port, a second port, a third port and a fourth port; the first port and the second port are connected with an energy storage battery; the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube form a bidirectional DC-DC circuit; the first input end of the control chip is connected with the first port, the second input end of the control chip is connected with one end of the inductor, the other end of the inductor is connected with one end of the thermistor, and the other end of the thermistor is connected with the third interface; the positive electrode of the energy storage capacitor is connected with the second input end of the control chip, and the negative electrode of the energy storage capacitor is grounded; the drain electrode of the fifth MOS tube is connected with the fourth port, the source electrode of the fifth MOS tube is grounded, and the grid electrode of the fifth MOS tube is connected with the third port; by the technical scheme, on the premise of a direct current power supply system in the equipment disengaging station, long-time stable electric energy can be provided for the equipment disengaging station.
Description
Technical Field
The utility model relates to the technical field of current measurement of power systems, in particular to a circuit for uninterrupted power supply.
Background
Relay protection (secondary equipment) is used as a first defense line of a power grid, bears an important task of rapidly cutting off and isolating faults, and is a '360 safety guard' of a power system. The direct current system in the transformer substation is an important system for supplying power to the relay protection device, the control loop and the outlet loop of the relay protection device, and influences the correctness of the protection action, so that the direct current system is an important system for influencing the stable operation of the power grid. Overall, the problem of the dc system directly affects the stability and safety of the overall operation of the grid.
The direct current system is used as an important system for supplying power to a control loop, a relay protection device and an outlet loop of the transformer substation, and in large and medium transformer substations, the direct current system is used as an 'aorta and capillary vessel' in the transformer substation and is distributed throughout all corners in the transformer substation. However, when an abnormal problem occurs in the direct current system in the station, on-site maintenance personnel often need to disconnect corresponding direct current switches one by one so as to find accurate fault points, which can lead to forced power failure of part of the direct current feeder lines which normally operate in the process of finding the fault points, lead to short-time power failure of related important secondary equipment, and seriously influence the safe and stable operation of the power system.
Disclosure of Invention
In view of the above, an object of the present utility model is to provide a circuit for uninterruptible power supply, which can provide stable electric energy for a long time on the premise of disengaging a dc power supply system in a station.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a circuit for uninterrupted power supply comprises a first port, a second port, a third port and a fourth port; the first port and the second port are connected with an energy storage battery; the device also comprises a control chip, an inductor, a thermistor, an energy storage capacitor, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and a fifth MOS tube; the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube form a bidirectional DC-DC circuit; the first input end of the control chip is connected with the first port, the second input end of the control chip is connected with one end of the inductor, the other end of the inductor is connected with one end of the thermistor, and the other end of the thermistor is connected with the third port; the positive electrode of the energy storage capacitor is connected with the second input end of the control chip, and the negative electrode of the energy storage capacitor is grounded; the drain electrode of the fifth MOS tube is connected with the fourth port, the source electrode of the fifth MOS tube is grounded, and the grid electrode of the fifth MOS tube is connected with the third port.
In a preferred embodiment, the gate of the first MOS transistor is connected to one end of the first resistor, the other end of the first resistor is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, one end of the third resistor is grounded, and the source electrode of the first MOS transistor is grounded.
In a preferred embodiment, the gate of the second MOS transistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the negative electrode of the second diode, the positive electrode of the second diode is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is grounded, and the source of the second MOS transistor is grounded.
In a preferred embodiment, a gate of the third MOS transistor is connected to one end of the seventh resistor, one end of the eighth resistor, and one end of the ninth resistor, and the other end of the seventh resistor and a source of the third MOS transistor are connected to a drain of the first MOS transistor; the other end of the eighth resistor is connected with the cathode of the third diode, and the other end of the ninth resistor is connected with the anode of the third diode; and the drain electrode of the third MOS tube is connected with one end of the thermistor.
In a preferred embodiment, the gate of the fourth MOS transistor is connected to one end of the tenth resistor, one end of the eleventh resistor, and one end of the twelfth resistor; the other end of the tenth resistor and the source electrode of the fourth MOS tube are connected with the drain electrode of the first MOS tube, the other end of the eleventh resistor is connected with the cathode of the fourth diode, and the other end of the twelfth resistor is connected with the anode of the fourth diode; and the drain electrode of the fourth MOS tube is connected with one end of the thermistor.
In a preferred embodiment, the third port and the fourth port are connected to the internal dc power supply in the station when in the normal charging mode; and the fifth MOS tube enables the loop to be conducted, after the electric energy provided by direct current in the station passes through the thermistor=, one part charges the high-density energy storage electric energy, and the other part charges the lithium battery pack connected with the first port and the second port through the bidirectional DC-DC circuit.
In a preferred embodiment, in the reverse charging mode, i.e. the positive and negative poles of the third port and the fourth port are reversed, the fifth MOS transistor is in a reverse off state and cannot be turned on, and the circuit is disconnected from the dc power supply in the station.
In a preferred embodiment, in the short-time power supply mode, the third port and the fourth port are connected to the load in the station, and the energy storage capacitor supplies power to the direct current load in the station through the fifth MOS transistor when the direct current power supply in the station is lost.
In a preferred embodiment, in the long-time power supply mode, the third port and the fourth port are connected with the in-station load, the energy storage capacitor supplies power for the in-station direct current load through the fifth MOS tube, and when the voltage of the energy storage capacitor drops to a set threshold value, the electric energy in the lithium battery pack on the third port and the fourth port supplies power for the energy storage capacitor and the in-station direct current load through the bidirectional DC-DC circuit.
Compared with the prior art, the utility model has the following beneficial effects: the device can provide stable electric energy for the device for a long time on the premise of separating the device from a direct current power supply system in the station.
Drawings
FIG. 1 is a main circuit diagram of an uninterruptible power supply in accordance with a preferred embodiment of the utility model;
FIG. 2 is a schematic diagram of a man-machine interaction circuit for driving a corresponding indicator light according to a preferred embodiment of the present utility model;
fig. 3 is a series of operational amplifier circuits in accordance with a preferred embodiment of the present utility model.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application; as used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Referring to fig. 1, an uninterruptible power supply circuit includes a first port P1, a second port P2, a third port P3, and a fourth port P4; the first port P1 and the second port P2 are connected with an energy storage battery; the device also comprises a control chip, an inductor, a thermistor NTC1, an energy storage capacitor, a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4 and a fifth MOS tube Q5; the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3 and the fourth MOS tube Q4 form a bidirectional DC-DC circuit; the first input end IP-of the control chip is connected with the first port, the second input end IP+ of the control chip is connected with one end of an inductor, the other end of the inductor is connected with one end of the thermistor NTC1, and the other end of the thermistor NTC1 is connected with the third port P3; the positive electrode of the energy storage capacitor is connected with the second input end of the control chip, and a diode is connected between the positive electrode of the energy storage capacitor and the second input end of the control chip; the negative electrode of the energy storage capacitor is grounded; the drain electrode of the fifth MOS tube Q5 is connected with the fourth port P4, the source electrode of the fifth MOS tube Q5 is grounded, and the grid electrode of the fifth MOS tube Q5 is connected with the third port P3.
The grid electrode of the first MOS tube Q1 is connected with one end of a first resistor R9, the other end of the first resistor R9 is connected with the negative electrode of a first diode D1, the positive electrode of the first diode D1 is connected with one end of a second resistor R5, the other end of the second resistor R5 is connected with one end of a third resistor R1, one end of the third resistor R1 is grounded, and the source electrode of the first MOS tube Q1 is grounded.
The grid electrode of the second MOS tube Q2 is connected with one end of a fourth resistor R10, the other end of the fourth resistor R10 is connected with the negative electrode of a second diode D2, the positive electrode of the second diode D2 is connected with one end of a fifth resistor R6, the other end of the fifth resistor R6 is connected with one end of a sixth resistor R2, the other end of the sixth resistor R2 is grounded, and the source electrode of the second MOS tube Q2 is grounded.
The grid electrode of the third MOS tube Q3 is connected with one end of a seventh resistor R3, one end of an eighth resistor R7 and one end of a ninth resistor R11, and the other end of the seventh resistor R3 and the source electrode of the third MOS tube Q3 are connected with the drain electrode of the first MOS tube Q1; the other end of the eighth resistor R7 is connected with the cathode of the third diode D4, and the other end of the ninth resistor R11 is connected with the anode of the third diode D4; and the drain electrode of the third MOS tube Q3 is connected with one end of the thermistor NTC 1.
The grid electrode of the fourth MOS tube Q4 is connected with one end of a tenth resistor R12, one end of an eleventh resistor R8 and one end of a twelfth resistor R4; the other end of the tenth resistor R12 and the source electrode of the fourth MOS transistor Q4 are connected with the drain electrode of the first MOS transistor Q1, the other end of the eleventh resistor R8 is connected with the cathode of the fourth diode D3, and the other end of the twelfth resistor R4 is connected with the anode of the fourth diode D3; and the drain electrode of the fourth MOS tube Q4 is connected with one end of the thermistor NTC 1.
There are four modes of operation, namely a normal charging mode, a reverse charging mode, a short-time power supply mode and a long-time power supply mode. The four modes correspond to the following four cases respectively:
(1) when the device works in a normal charging mode, the circuit is conducted through the fifth MOS switch Q5, after electric energy provided by direct current in the station passes through the thermistor NTC1, one part of the electric energy charges high-density energy storage electric energy, and the other part charges a lithium battery pack connected with the first port P1 and the second port P2 through a bidirectional DC-DC circuit formed by the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3 and the fourth MOS tube Q4, wherein the thermistor NTC1 is designed to limit short-circuit current when a later-stage circuit fails.
(2) When the device is in the charging reverse connection mode, namely the positive and negative poles of the third port P3 and the fourth port P4 are reversely connected. At this time, the fifth MOS transistor Q5 is in a reverse off state and cannot be turned on, and the circuit is disconnected from the in-station dc power supply. The design protects the safety of the direct current system in the station and the personal safety of a user using equipment.
(3) When the equipment works in the short-time power supply mode, under the condition that a direct-current power supply in the station is lost, the energy storage capacitor can provide power for a direct-current load in the station through the fifth MOS tube Q5, and the electrodeless switching is realized between the power supply mode and the charging mode due to the characteristic of the energy storage capacitor.
(4) When the equipment works in a long-time power supply mode, the energy storage capacitor supplies power for the direct current load in the station through the fifth MOS tube Q5, and when the voltage of the energy storage capacitor is reduced to a set threshold value, electric energy in the lithium battery pack on the third port P3 and the fourth port P4 supplies power for the energy storage capacitor and the direct current load in the station through a bidirectional DC-DC circuit formed by the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3 and the fourth MOS tube Q4. At this time, the energy storage capacitor also plays a role in suppressing the start voltage pulse.
The first port P1 and the second port P2 of the uninterrupted power supply circuit for the transformer substation are connected into the energy storage lithium battery pack and are used for providing stable power supply for equipment in the transformer substation for a long time. When the device works in a charging mode, the third port P3 and the fourth port P4 are connected with a direct current power supply in the station, so that the device is charged; when the device works in the power supply mode, the third port P3 and the fourth port P4 are connected with corresponding loads in the station.
The circuit is mainly used by field overhauling staff in the process of searching for direct current faults in the transformer substation, so the patent designs a man-machine interaction circuit as shown in fig. 2, which is used for driving corresponding indicator lamps and reacting to the working state of the circuit, thereby better utilizing the circuit to work.
The circuit is an uninterrupted power supply circuit used in a transformer substation, equipment in the transformer substation is important equipment, the requirement on power supply quality is high, and 220V direct current power supply is mostly adopted, so that the circuit has more strict requirement on power supply stability, and a series of operational amplifier circuits shown in fig. 3 are designed and applied for realizing the function of providing a stable 220V direct current power supply for the operational amplifier circuits.
Claims (9)
1. The uninterrupted power supply circuit is characterized by comprising a first port, a second port, a third port and a fourth port; the first port and the second port are connected with an energy storage battery; the device also comprises a control chip, an inductor, a thermistor, an energy storage capacitor, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and a fifth MOS tube; the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube form a bidirectional DC-DC circuit; the first input end of the control chip is connected with the first port, the second input end of the control chip is connected with one end of the inductor, the other end of the inductor is connected with one end of the thermistor, and the other end of the thermistor is connected with the third port; the positive electrode of the energy storage capacitor is connected with the second input end of the control chip, and the negative electrode of the energy storage capacitor is grounded; the drain electrode of the fifth MOS tube is connected with the fourth port, the source electrode of the fifth MOS tube is grounded, and the grid electrode of the fifth MOS tube is connected with the third port.
2. The uninterruptible power supply circuit according to claim 1, wherein a gate of the first MOS transistor is connected to one end of the first resistor, the other end of the first resistor is connected to a negative electrode of the first diode, a positive electrode of the first diode is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, one end of the third resistor is grounded, and a source electrode of the first MOS transistor is grounded.
3. The uninterruptible power supply circuit according to claim 2, wherein a gate of the second MOS transistor is connected to one end of a fourth resistor, the other end of the fourth resistor is connected to a negative electrode of the second diode, a positive electrode of the second diode is connected to one end of a fifth resistor, the other end of the fifth resistor is connected to one end of a sixth resistor, the other end of the sixth resistor is grounded, and a source electrode of the second MOS transistor is grounded.
4. The uninterruptible power supply circuit according to claim 3, wherein a gate of the third MOS transistor is connected to one end of a seventh resistor, one end of an eighth resistor, and one end of a ninth resistor, and the other end of the seventh resistor and a source of the third MOS transistor are connected to a drain of the first MOS transistor; the other end of the eighth resistor is connected with the cathode of the third diode, and the other end of the ninth resistor is connected with the anode of the third diode; and the drain electrode of the third MOS tube is connected with one end of the thermistor.
5. The uninterruptible power supply circuit according to claim 4, wherein a gate of the fourth MOS transistor is connected to one end of the tenth resistor, one end of the eleventh resistor, and one end of the twelfth resistor; the other end of the tenth resistor and the source electrode of the fourth MOS tube are connected with the drain electrode of the first MOS tube, the other end of the eleventh resistor is connected with the cathode of the fourth diode, and the other end of the twelfth resistor is connected with the anode of the fourth diode; and the drain electrode of the fourth MOS tube is connected with one end of the thermistor.
6. The uninterruptible power supply of claim 5, wherein the third port and the fourth port are connected to a direct current power supply in the station when in a normal charging mode; and the fifth MOS tube enables the loop to be conducted, after the electric energy provided by direct current in the station passes through the thermistor=, one part charges the high-density energy storage electric energy, and the other part charges the lithium battery pack connected with the first port and the second port through the bidirectional DC-DC circuit.
7. The circuit for uninterruptible power supply according to claim 5, wherein in the reverse charging mode, the positive and negative electrodes of the third port and the fourth port are reversed, the fifth MOS transistor is in a reverse off state and cannot be turned on, and the circuit is disconnected from the in-station dc power supply.
8. The uninterruptible power supply circuit according to claim 5, wherein the third port and the fourth port are connected to the in-station load in the short-time power supply mode, and the energy storage capacitor supplies power to the in-station dc load through the fifth MOS transistor when the in-station dc power supply is lost.
9. The circuit for uninterruptible power supply according to claim 5, wherein the third port and the fourth port are connected to the in-station load in the long-time power supply mode, the storage capacitor supplies power to the in-station DC load through the fifth MOS transistor, and when the voltage of the storage capacitor drops to a set threshold value, the electric power in the lithium battery pack on the third port and the fourth port supplies power to the storage capacitor and the in-station DC load through the bidirectional DC-DC circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223212386.1U CN219477658U (en) | 2022-11-30 | 2022-11-30 | Uninterrupted power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223212386.1U CN219477658U (en) | 2022-11-30 | 2022-11-30 | Uninterrupted power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219477658U true CN219477658U (en) | 2023-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223212386.1U Active CN219477658U (en) | 2022-11-30 | 2022-11-30 | Uninterrupted power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219477658U (en) |
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2022
- 2022-11-30 CN CN202223212386.1U patent/CN219477658U/en active Active
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