CN221328674U - Continuous power supply circuit for fault wave recording and power grid fault diagnosis system - Google Patents
Continuous power supply circuit for fault wave recording and power grid fault diagnosis system Download PDFInfo
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- CN221328674U CN221328674U CN202322992205.XU CN202322992205U CN221328674U CN 221328674 U CN221328674 U CN 221328674U CN 202322992205 U CN202322992205 U CN 202322992205U CN 221328674 U CN221328674 U CN 221328674U
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 33
- 238000004146 energy storage Methods 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 80
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
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Abstract
The application discloses a continuous power supply circuit for fault recording and a power grid fault diagnosis system, wherein the power supply circuit comprises an input power supply, a bypass circuit, a charging circuit, a discharging circuit, a storage circuit, a voltage equalizing circuit and a load, and the input end and the output end of the bypass circuit are respectively connected with the input power supply and the load; the charging circuit and the discharging circuit are connected in series and then connected in parallel to two ends of the bypass circuit, the input end of the charging circuit is connected with the input power supply, and the output end of the discharging circuit is connected with the load; the energy storage circuit comprises an electric energy storage unit, one end of the energy storage circuit is connected to the charging circuit and the discharging circuit respectively, and the other end of the energy storage circuit is connected to the load; the voltage equalizing circuit is connected with the energy storage circuit in parallel; the charging circuit and the discharging circuit with different paths are arranged, so that the load can be continuously powered, the voltage equalizing circuit can automatically withdraw when the power supply is in power failure, and the loss caused by the voltage equalizing resistor can be reduced to the greatest extent.
Description
Technical Field
The application belongs to the technical field of digital power supplies, and particularly relates to a continuous power supply circuit for fault recording and a power grid fault diagnosis system.
Background
The fault recorder is used for power electronic equipment or a system, and can automatically and accurately record the change condition of various electric quantities before and after the fault when the system is in fault. The electric quantity can be analyzed and compared to further process the accident, so that the fault record has important functions in the aspects of analyzing and processing the accident, judging whether the protection device acts correctly, improving the safe operation level of the electric power system and the like. At present, a button battery is generally used for continuously providing electric energy for important equipment after the system is powered off, but because the battery outputs electric power outwards in a unidirectional way, when the electric power of the battery is exhausted, the fault recorder loses the function of the fault recorder, so that the record of a chip is lost, and the change condition of electric quantity before and after the power supply is powered off can not be recorded when the system is in fault.
The patent application document with the application number of CN202123260234.4 provides a super capacitor-based continuous power supply circuit after power failure, which comprises a main circuit power supply, a super-electric charging circuit, a super-electric discharging circuit, a main circuit and super-electric intersection circuit and a main power supply circuit; the output end of the main circuit power supply is respectively connected to the input end of the super-electric charging circuit and the input end of the main circuit and super-electric junction circuit; the output end of the super-electric charging circuit is connected to the input end of the super-electric discharging circuit; the output end of the super-electric discharge circuit is electrically connected with the input end of the super-electric intersection circuit; the output end of the super-electric junction circuit is connected to the input end of the main power supply circuit; the output end of the main power circuit outputs load voltage; the super-electric charging circuit and the super-electric discharging circuit are used as slave circuits; the main power supply is used as a power supply main circuit. However, the circuit is too complex in implementation mode, a boosting DC/DC circuit is used, the circuit cost is high, the voltage equalizing problem of the super capacitor is not well solved by the circuit, and when the capacity of one capacitor is reduced, overvoltage damage of the other capacitor is easily caused.
Disclosure of Invention
The application aims to provide a continuous power supply circuit for a fault wave recording executive device, which overcomes the defect of limited charge and discharge life of a battery, and simultaneously effectively improves the follow current capability through voltage equalizing design.
In view of this, a first aspect of the present application provides a continuous power supply circuit for fault logging, comprising: the device comprises an input power supply, a bypass circuit, a charging circuit, a discharging circuit, an energy storage circuit, a voltage equalizing circuit and a load, wherein the input end of the bypass circuit is connected with the input power supply, and the output end of the bypass circuit is connected with the load; the charging circuit and the discharging circuit are connected in series and then connected in parallel to two ends of the bypass circuit, the input end of the charging circuit is connected with the input power supply, and the output end of the discharging circuit is connected with the load; the energy storage circuit comprises at least one electric energy storage unit, one end of the energy storage circuit is connected to the charging circuit and the discharging circuit respectively, and the other end of the energy storage circuit is connected to the load; the voltage equalizing circuit is connected with the energy storage circuit in parallel; the load is an executive device for fault wave recording;
Preferably, the input power supply is a single-phase power supply VCC, the bypass circuit is a rectifier diode D1, and the single-phase power supply VCC supplies power to the load through the rectifier diode D1;
Preferably, the electric energy storage unit is a super capacitor, the super capacitor comprises a super capacitor C1 and a super capacitor C2, and the super capacitor C1 and the super capacitor C2 are connected in series;
preferably, the charging circuit comprises a rectifying diode D2 and a current limiting resistor R1 connected in series; the discharging circuit is a rectifying diode D3; the single-phase power supply VCC charges the super capacitor through a rectifying diode D2 and a current limiting resistor R1, and the super capacitor continuously supplies power to the load through a rectifying diode D3;
Preferably, when the number of the electric energy storage units is multiple, the number of the voltage equalizing circuits is adapted to the number of the super capacitors, the voltage equalizing circuit 1 of the super capacitor C1 comprises a voltage equalizing resistor R2, a switching tube Q1 and a voltage equalizing resistor R3 which are sequentially connected in series, the voltage equalizing circuit 2 of the super capacitor C2 comprises a voltage equalizing resistor R5, a switching tube Q2 and a voltage equalizing resistor R7 which are sequentially connected in series, the voltage equalizing circuit further comprises a pull-down resistor R6, and the pull-down resistor R6 is connected with the gates of the switching tube Q1 and the switching tube Q2;
Preferably, when the input power VCC is the only power for the load and the power is a BUCK circuit or a BOOST circuit, the power supply circuit removes the bypass circuit, the charging circuit is a charging resistor R1, the discharging circuit is a discharging diode D2, the energy storage circuit includes a super capacitor C1 and a super capacitor C2 connected in series, the voltage equalizing circuit 1 of the super capacitor 1 is a voltage equalizing resistor R2, the voltage equalizing resistor R2 is connected in parallel with the super capacitor C1, the voltage equalizing circuit 2 of the super capacitor C2 is a voltage equalizing resistor R4, and the voltage equalizing resistor R4 is connected in parallel with the super capacitor C2;
Preferably, the voltage equalizing circuit may further be implemented by a double-blade relay, and includes a voltage equalizing resistor R2, a double-blade relay K1, and a voltage equalizing resistor R2, where the voltage equalizing resistor R2 is connected with the first switch of the double-blade relay and is parallel to the super capacitor C1, and the voltage equalizing resistor R4 is connected with the second switch of the double-blade relay and is parallel to the super capacitor C2.
Another aspect of the present application provides a power grid fault diagnosis system, which adopts the continuous power supply circuit provided in the first aspect; the power grid fault diagnosis system can record the change condition of the electric quantity in the process before and after the power system breaks down.
The beneficial effects are that:
the utility model adopts different charging circuits and discharging circuits, and can continuously supply power to the load when the power supply fails;
The bypass circuit and the discharge circuit are provided with diodes which are conducted unidirectionally, so that unidirectional power transmission to a load can be realized;
The voltage-sharing resistor is connected with the switch tube in series, so that energy loss caused by the voltage-sharing resistor can be reduced in the continuous power supply process of the super capacitor, and when the power supply loses power, the voltage-sharing circuit can automatically withdraw, so that loss caused by the voltage-sharing resistor can be reduced to the greatest extent.
Drawings
FIG. 1 is a schematic diagram of a continuous power supply circuit for fault recording according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a continuous power supply circuit for fault logging according to embodiment 1 of the present application;
FIG. 3 is a schematic diagram of a continuous power supply circuit for fault logging according to embodiment 2 of the present application;
fig. 4 is a schematic diagram of a continuous power supply circuit for fault recording according to embodiment 3 of the present application.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it should be noted that: in the description of embodiments of the present utility model, the terms "first," "second," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying a degree of importance.
Example 1
As shown in FIG. 1, a continuous power supply circuit for fault recording comprises an input power supply, a bypass circuit, a charging circuit, a discharging circuit, a storage circuit, a voltage equalizing circuit and a load.
The input end of the bypass circuit is connected with the input power supply, and the output end of the bypass circuit is connected with the load; the charging circuit and the discharging circuit are connected in series and then connected in parallel to two ends of the bypass circuit, the input end of the charging circuit is connected with the input power supply, and the output end of the discharging circuit is connected with the load; the energy storage circuit comprises at least one electric energy storage unit, one end of the energy storage circuit is connected to the charging circuit and the discharging circuit respectively, and the other end of the energy storage circuit is connected to the load; the voltage equalizing circuit is connected with the energy storage circuit in parallel; the load is an executive device for fault wave recording.
Specifically, as shown in fig. 2, the input power source is a single-phase power source VCC, and is used for providing electric energy for the power supply circuit;
The bypass circuit is a rectifier diode D1, and the power supply VCC supplies power to the load through the rectifier diode D1 under the condition that the power supply VCC is electrified.
The electric energy storage unit is super capacitor, super capacitor is the capacity that reaches farad level, has very high capacity, but because super capacitor monomer voltage is low, if directly be used for backup power supply obviously can't reach the required voltage range of chip, consequently need to establish ties a plurality of super capacitors and make up into super capacitor module and use when practical application, just can satisfy the requirement of equipment, in this embodiment, super capacitor quantity is 2, super capacitor C1 and super capacitor C2 series connection, optionally, electric energy storage unit also can be two sections lithium ion battery.
The charging circuit comprises a rectifying diode D2 and a current limiting resistor R1 which are connected in series; the discharging circuit comprises a rectifying diode D3; the current limiting resistor R1 is connected with the positive electrode of the super capacitor C1, and charges the super capacitor through the charging circuit when the power supply VCC is electrified to supply power to the load, so that the functions of automatic storage of electric energy and automatic power supply through the bypass circuit are realized; the positive electrode of the super capacitor C1 is also connected with the positive electrode of the rectifier diode D3, and the super capacitor continuously supplies power to the load through the discharging circuit under the condition that the power supply VCC loses power.
Due to the dispersion of the parameters of the super capacitor, the working voltage of the super capacitor is unbalanced in the charging and discharging process, so that the overvoltage condition of part of the super capacitor is caused, the output characteristic and the service life of the super capacitor are seriously influenced, even faults are caused, and the safe operation of the series capacitor bank is influenced, therefore, a voltage equalizing circuit is necessary to eliminate the influence of the uneven voltage of the super capacitor in the charging and discharging process, when the number of the super capacitors is multiple, the number of the voltage equalizing circuits is adaptive to the number of the super capacitors, the voltage equalizing circuit 1 of the super capacitor C1 comprises a voltage equalizing resistor R2, a switching tube Q1 and a voltage equalizing resistor R3 which are sequentially connected in series, and the voltage equalizing circuit 2 of the super capacitor C2 comprises a voltage equalizing resistor R5, a switching tube Q2 and a voltage equalizing resistor R7 which are sequentially connected in series; the energy loss caused by the voltage equalizing resistor can be reduced in the continuous power supply process of the super capacitor by connecting the voltage equalizing resistor in series with the switching tube; and, under the condition that the power VCC has electricity, the voltage-sharing circuit automatically works, and under the condition that the power VCC loses electricity, the voltage-sharing circuit can withdraw automatically, the loss brought by the voltage-sharing resistor can be reduced to the greatest extent, the super capacitor supplies power to the load to the greatest extent, but because the switching tube has the junction capacitance, the switching tube can still be in a conducting state for a long time after the power failure, and the situation that the switching tube cannot be turned off occurs, therefore, a pull-down resistor is connected to the grid electrode of the switching tube, and the rapid release of the junction capacitance can be realized through the pull-down resistor, so that the switching tube is turned off rapidly.
The rectifier diode D1, the rectifier diode D2 and the rectifier diode D3 are conducted only when forward bias is conducted, the super capacitor can be prevented from reversely supplying power to the power source VCC and other loads after the power source VCC is powered down, and the current of the capacitor can be rapidly increased in the charging process, so that the charging current is limited by connecting the current limiting resistor R1 in series, and damage to a circuit caused by overlarge current is prevented.
Example 2
On the basis of embodiment 1, the power supply circuit can be simplified, when the input power VCC is the only power supply of the load, and the power supply is a BUCK circuit or a BOOST circuit, as shown in fig. 3, the power supply circuit removes the bypass circuit, directly supplies power to the load through the power supply, the charging circuit is simplified into a charging resistor R1, the discharging circuit is simplified into a discharging diode D2, the energy storage circuit comprises a super capacitor C1 and a super capacitor C2 connected in series, the voltage equalizing circuit 1 of the super capacitor 1 is a voltage equalizing resistor R2, the voltage equalizing resistor R2 is connected in parallel with the super capacitor C1, the voltage equalizing circuit 2 of the super capacitor C2 is a voltage equalizing resistor R4, and the voltage equalizing resistor R4 is connected in parallel with the super capacitor C2.
Example 3
The voltage equalizing circuit has another preferred scheme, can adopt the mode of double-knife relay to realize, on the basis of embodiment 1, input power supply, bypass circuit, charging circuit, discharge circuit, tank circuit and load connection mode are unchangeable, voltage equalizing circuit includes voltage-sharing resistance R2, double-knife relay K1 and voltage-sharing resistance R2, voltage-sharing resistance R2 with double-knife relay first switch is connected, and with super capacitor C1 connects in parallel, voltage-sharing resistance R4 with double-knife relay second switch is connected, and with super capacitor C2 connects in parallel, when double-knife relay first switch and second switch are closed respectively, voltage-sharing resistance R2 with voltage-sharing resistance R4 inserts respectively super capacitor C1 with super capacitor C2 to balance super capacitor's voltage.
Example 4
A power grid fault diagnosis system adopts a continuous power supply circuit described in embodiments 1-3, which is used for recording the change condition of various electric quantities before and after the power system is in fault, and can overcome the problems that when the power of a battery is exhausted, a fault wave recording executive device cannot exert the function due to the loss of the power supply, so that the record of a chip is lost, the system is in fault, and the change condition of the electric quantity before and after the power supply is in power failure can not be recorded.
It is apparent that the described embodiments of the application are only some embodiments of the application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (8)
1. A continuous power supply circuit for fault recording, characterized in that: the power supply comprises an input power supply, a bypass circuit, a charging circuit, a discharging circuit, an energy storage circuit, a voltage equalizing circuit and a load, wherein the input end of the bypass circuit is connected with the input power supply, and the output end of the bypass circuit is connected with the load; the charging circuit and the discharging circuit are connected in series and then connected in parallel to two ends of the bypass circuit, the input end of the charging circuit is connected with the input power supply, and the output end of the discharging circuit is connected with the load; the energy storage circuit comprises at least one electric energy storage unit, one end of the energy storage circuit is connected to the charging circuit and the discharging circuit respectively, and the other end of the energy storage circuit is connected to the load; the voltage equalizing circuit is connected with the energy storage circuit in parallel; the load is an executive device for fault wave recording.
2. A continuous power supply circuit for fault logging as in claim 1, wherein: the input power supply is a single-phase power supply VCC, the bypass circuit is a rectifier diode D1, and the single-phase power supply VCC supplies power to the load through the rectifier diode D1.
3. A continuous power supply circuit for fault logging as claimed in claim 2, wherein: the electric energy storage unit is a super capacitor, the super capacitor comprises a super capacitor C1 and a super capacitor C2, and the super capacitor C1 and the super capacitor C2 are connected in series.
4. A continuous power supply circuit for fault logging as claimed in claim 3, wherein: the charging circuit comprises a rectifying diode D2 and a current limiting resistor R1 which are connected in series; the discharging circuit is a rectifying diode D3; the single-phase power supply VCC charges the super capacitor through a rectifying diode D2 and a current limiting resistor R1, and the super capacitor continuously supplies power to the load through a rectifying diode D3.
5. A continuous power supply circuit for fault logging as claimed in claim 3, wherein: the voltage equalizing circuit quantity is adaptive to the super capacitor quantity, the voltage equalizing circuit 1 of the super capacitor C1 comprises a voltage equalizing resistor R2, a switching tube Q1 and a voltage equalizing resistor R3 which are sequentially connected in series, the voltage equalizing circuit 2 of the super capacitor C2 comprises a voltage equalizing resistor R5, a switching tube Q2 and a voltage equalizing resistor R7 which are sequentially connected in series, the voltage equalizing circuit further comprises a pull-down resistor R6, and the pull-down resistor R6 is connected with the switching tube Q1 and the grid electrode of the switching tube Q2.
6. A continuous power supply circuit for fault logging as in claim 1, wherein: when the input power supply VCC is the only power supply of the load and the power supply is a BUCK circuit or a BOOST circuit, the bypass circuit can be removed by the power supply circuit, the charging circuit is a charging resistor R1, the discharging circuit is a discharging diode D2, the energy storage circuit comprises a super capacitor C1 and a super capacitor C2 which are connected in series, the voltage equalizing circuit 1 of the super capacitor 1 is a voltage equalizing resistor R2, the voltage equalizing resistor R2 is connected in parallel with the super capacitor C1, the voltage equalizing circuit 2 of the super capacitor C2 is a voltage equalizing resistor R4, and the voltage equalizing resistor R4 is connected in parallel with the super capacitor C2.
7. A continuous power supply circuit for fault logging as claimed in claim 3, wherein: the voltage equalizing circuit can be realized by adopting a double-blade relay and comprises a voltage equalizing resistor R2, a double-blade relay K1 and a voltage equalizing resistor R2, wherein the voltage equalizing resistor R2 is connected with a first switch of the double-blade relay and is connected with a super capacitor C1 in parallel, and the voltage equalizing resistor R4 is connected with a second switch of the double-blade relay and is connected with the super capacitor C2 in parallel.
8. A power grid fault diagnosis system, characterized in that: use of a continuous power supply circuit according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322992205.XU CN221328674U (en) | 2023-11-07 | 2023-11-07 | Continuous power supply circuit for fault wave recording and power grid fault diagnosis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322992205.XU CN221328674U (en) | 2023-11-07 | 2023-11-07 | Continuous power supply circuit for fault wave recording and power grid fault diagnosis system |
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| Publication Number | Publication Date |
|---|---|
| CN221328674U true CN221328674U (en) | 2024-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322992205.XU Active CN221328674U (en) | 2023-11-07 | 2023-11-07 | Continuous power supply circuit for fault wave recording and power grid fault diagnosis system |
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| Country | Link |
|---|---|
| CN (1) | CN221328674U (en) |
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2023
- 2023-11-07 CN CN202322992205.XU patent/CN221328674U/en active Active
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