CN219164207U - Overvoltage and undervoltage protection circuit and power grid system - Google Patents
Overvoltage and undervoltage protection circuit and power grid system Download PDFInfo
- Publication number
- CN219164207U CN219164207U CN202320061779.2U CN202320061779U CN219164207U CN 219164207 U CN219164207 U CN 219164207U CN 202320061779 U CN202320061779 U CN 202320061779U CN 219164207 U CN219164207 U CN 219164207U
- Authority
- CN
- China
- Prior art keywords
- power supply
- voltage
- resistor
- unit
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Rectifiers (AREA)
Abstract
The embodiment of the application provides an overvoltage and undervoltage protection circuit and a power grid system, wherein the overvoltage and undervoltage protection circuit comprises: the first switch unit, the second switch unit and the third switch unit are respectively arranged on the paths of the three-phase power transmission line; the power supply unit comprises a sequential power supply module, the sequential power supply module comprises a first power supply end, a second power supply end and a third power supply end, the first power supply end is connected with the first switch unit, the second power supply end is connected with the second switch unit, the third power supply end is connected with the third switch unit, and the sequential power supply module is configured to supply power to the first switch unit, the second switch unit and the third switch unit in sequence according to the sequence of the first power supply end, the second power supply end and the third power supply end. By the mode, the circuit structure of the power supply unit can be simplified, and the circuit cost is reduced.
Description
Technical Field
The application relates to the technical field of power supply, in particular to an overvoltage and undervoltage protection circuit and a power grid system.
Background
At present, a magnetic latching relay is generally adopted as an actuating element for switching on or switching off a conventional self-recovery overvoltage and undervoltage protection circuit breaker in the market, and energy required by switching on or switching off a product is provided by an energy storage capacitor in a power supply circuit. The corresponding time of the action of the magnetic latching relay is related to the applied voltage and also related to the parameters of the magnetic latching relay, such as coil impedance, electromagnetic parameters and the like.
In the three-phase self-resetting overvoltage and undervoltage protection circuit breaker, three magnetic latching relays are respectively connected in series with a A, B, C-phase wire inlet end and a A, B, C-phase wire outlet end, the N-phase wire inlet end and the N-phase wire outlet end are directly communicated through wires, and the driving power supplies of coils of A, B, C successive electric appliances are the same power supply. A. When B, C relay response time is different, the whole product executes opening or closing time is prolonged, so that energy on the energy storage capacitor is possibly insufficient, and although a parallel power supply mode is adopted to enable three relay power supplies to independently avoid the mutual influence of the relays, the required components are more, the required layout space is larger, and the required cost is higher.
Disclosure of Invention
The embodiment of the application provides an overvoltage and undervoltage protection circuit and a power grid system, which can simplify the circuit structure of a power supply unit and reduce the circuit cost.
The application provides an undervoltage protection circuit, undervoltage protection circuit includes: the first switch unit, the second switch unit and the third switch unit are respectively arranged on the paths of the three-phase power transmission line; the power supply unit comprises a sequential power supply module, the sequential power supply module comprises a first power supply end, a second power supply end and a third power supply end, the first power supply end is connected with the first switch unit, the second power supply end is connected with the second switch unit, the third power supply end is connected with the third switch unit, and the sequential power supply module is configured to supply power to the first switch unit, the second switch unit and the third switch unit in sequence according to the sequence of the first power supply end, the second power supply end and the third power supply end.
In some embodiments, the power supply unit comprises a rectifying module, and three input ends of the rectifying module are respectively connected with the three-phase power transmission line; the sequential power supply module comprises a first diode, a second diode, a first energy storage capacitor, a second energy storage capacitor and a third energy storage capacitor, wherein the input end of the first diode is connected with the output end of the rectifying module and is connected with the first power supply end; the first end of the first energy storage capacitor is connected with the first power supply end, the first end of the second energy storage capacitor is connected with the second power supply end, the first end of the third energy storage capacitor is connected with the third power supply end, and the second ends of the first energy storage capacitor, the second energy storage capacitor and the third energy storage capacitor are grounded.
In some embodiments, the sequential power supply module further includes a voltage regulator tube, a first end of the voltage regulator tube is connected to the output end of the rectifying module, and a second end of the voltage regulator tube is grounded.
In some embodiments, the power supply unit further includes a low dropout linear voltage regulator module, an input terminal of the low dropout linear voltage regulator module is connected to an output terminal of the second diode, and an output terminal of the low dropout linear voltage regulator module is configured to output a stabilized voltage.
In some embodiments, the rectification module includes: the input end of the first rectifying diode is connected with a first power transmission line of the three-phase power transmission line; the input end of the second rectifying diode is connected with a second power transmission line of the three-phase power transmission line; the input end of the third rectifying diode is connected with a third power transmission line of the three-phase power transmission line; the output ends of the first rectifying diode, the second rectifying diode and the third rectifying diode are connected to be used as the output end of the rectifying module.
In some embodiments, the rectification module further comprises: the first voltage reduction unit comprises a first voltage reduction capacitor and a first discharge resistor, wherein the first end of the first voltage reduction capacitor is connected with the first power transmission line, the second end of the first voltage reduction capacitor is connected with the input end of the first rectifier diode, the first end of the first discharge resistor is connected with the first end of the first voltage reduction capacitor, and the second end of the first discharge resistor is connected with the second end of the first voltage reduction capacitor; the first end of the second discharging resistor is connected with the first end of the second voltage reducing capacitor, and the second end of the second discharging resistor is connected with the second end of the second voltage reducing capacitor; the third voltage reducing unit comprises a third voltage reducing capacitor and a third discharging resistor, wherein the first end of the third voltage reducing capacitor is connected with a third power transmission line, the second end of the third voltage reducing capacitor is connected with the input end of the third rectifier diode, the first end of the third discharging resistor is connected with the first end of the third voltage reducing capacitor, and the second end of the third discharging resistor is connected with the second end of the third voltage reducing capacitor.
In some embodiments, the rectification module further comprises: the first end of the first current limiting resistor is connected with the first power transmission line, and the second end of the first current limiting resistor is connected with the first end of the first buck capacitor; the first end of the second current limiting resistor is connected with the second power transmission line, and the second end of the second current limiting resistor is connected with the first end of the second buck capacitor; the first end of the third current limiting resistor is connected with the third power transmission line, and the second end of the third current limiting resistor is connected with the first end of the third buck capacitor.
In some embodiments, the rectification module further comprises: the first end of the first surge protection resistor is connected with the first power transmission line; the first end of the second surge protection resistor is connected with the second power transmission line; the first end of the third surge protection resistor is connected with a third power transmission line; the first end of the fourth surge protection resistor is connected with the second ends of the first surge protection resistor, the second surge protection resistor and the third surge protection resistor, and the second end of the fourth surge protection resistor is grounded; the first surge protection resistor, the second surge protection resistor, the third surge protection resistor and the fourth surge protection resistor are piezoresistors.
In some embodiments, the over-voltage and under-voltage protection circuit includes: the first phase detection unit, the second phase detection unit and the third phase detection unit are respectively connected with a three-phase power transmission line; the first driving unit is connected with the first switch unit, the second driving unit is connected with the second switch unit, and the third driving unit is connected with the third switch unit; an over-voltage and under-voltage parameter calibration unit; the control unit is connected with the power supply unit, the first phase detection unit, the second phase detection unit, the third phase detection unit, the first driving unit, the second driving unit, the third driving unit and the over-voltage and under-voltage parameter calibration unit; the control unit is configured to compare the phase voltage acquired by a phase detection unit with the calibration voltage after the overvoltage and undervoltage parameter calibration unit enters the calibration state, and control the corresponding driving unit to operate the corresponding switching unit according to the comparison result.
In some embodiments, the phase detection unit comprises: the first end of the first voltage dividing resistor is connected with the power transmission line of the corresponding phase; the input end of the voltage dividing diode is connected with the second end of the first voltage dividing resistor, and the output end of the voltage dividing diode is connected with the control unit; and the first end of the second voltage dividing resistor is connected with the output end of the voltage dividing diode, and the second end of the second voltage dividing resistor is grounded.
In some embodiments, the phase detection unit further includes a voltage stabilizing capacitor, a first end of the voltage stabilizing capacitor is connected to an output end of the voltage dividing diode, and a second end of the voltage stabilizing capacitor is grounded.
In some embodiments, the over-voltage and under-voltage parameter calibration unit includes: the first end of the pull-up resistor is input with a calibration voltage, and the second end of the pull-up resistor is connected with the control unit; the first end of the control switch is connected with the second end of the pull-up resistor, and the second end of the control switch is grounded.
In some embodiments, the over-voltage and under-voltage parameter calibration unit further includes a filter capacitor, a first end of the filter capacitor is connected to a second end of the pull-up resistor, and a second end of the filter capacitor is grounded.
The application also provides a power grid system which comprises the overvoltage and undervoltage protection circuit.
The overvoltage and undervoltage protection circuit provided by the embodiment of the application comprises: the first switch unit, the second switch unit and the third switch unit are respectively arranged on the paths of the three-phase power transmission line; the power supply unit comprises a sequential power supply module, the sequential power supply module comprises a first power supply end, a second power supply end and a third power supply end, the first power supply end is connected with the first switch unit, the second power supply end is connected with the second switch unit, the third power supply end is connected with the third switch unit, and the sequential power supply module is configured to supply power to the first switch unit, the second switch unit and the third switch unit in sequence according to the sequence of the first power supply end, the second power supply end and the third power supply end. Through the mode, when the three relays are closed according to the power supply sequence of VCC1, VCC2 and VCC3 through the three formed power supply ends, the closing of the three relays is not affected. Because of using the three-phase zero crossing point closing technology, ABC three phases have a closing sequence due to the existence of phase difference, the action condition of the used magnetic latching relay is a pulse, no energy is consumed before and after the pulse appears, and the sequence power supply module and the control unit designed according to the characteristic control the three driving units to enable the corresponding relays to be closed and opened in sequence to be matched, so that the relays are not affected each other.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of an over-voltage and under-voltage protection circuit provided in the present application;
fig. 2 is a schematic structural diagram of an embodiment of the power supply unit 40 in fig. 1;
fig. 3 is a schematic structural diagram of another embodiment of the power supply unit 40 in fig. 1;
fig. 4 is a schematic structural diagram of an embodiment of the rectifying module 41 in fig. 2 and 3;
FIG. 5 is a schematic diagram of an embodiment of the phase detection unit in FIG. 1;
FIG. 6 is a schematic diagram illustrating an embodiment of the over-voltage and under-voltage parameter calibration unit 50 in FIG. 1;
fig. 7 is a schematic diagram of the structure of the switching unit in fig. 1;
fig. 8 is a schematic structural diagram of an embodiment of a power grid system provided in the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.
The use of "adapted" or "configured to" in this application is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps. In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.
In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of an over-voltage and under-voltage protection circuit provided in the present application, and the over-voltage and under-voltage protection circuit 100 includes a three-phase switch (a first switch unit 11, a second switch unit 12, and a third switch unit 13), a three-phase drive (a first drive unit 21, a second drive unit 22, and a third drive unit 23), a three-phase detection (a first phase detection unit 31, a second phase detection unit 32, and a third phase detection unit 33), a power supply unit 40, an over-voltage and under-voltage parameter calibration unit 50, and a control unit 60.
The three-phase power transmission line comprises an A-phase power transmission line, a B-phase power transmission line, a C-phase power transmission line and a ground wire N.
The first switching unit 11 is disposed on the path of the a-phase power line, the second switching unit 12 is disposed on the path of the B-phase power line, and the third switching unit 13 is disposed on the path of the C-phase power line.
The first driving unit 21 is connected to the first switch unit 11, the second driving unit 22 is connected to the second switch unit 12, the third driving unit 23 is connected to the third switch unit 13, and the driving units are configured to control the corresponding switch units to be turned on or off.
Wherein the first phase detection unit 31 is connected to the a-phase power line, the second phase detection unit 32 is connected to the B-phase power line, the third phase detection unit 33 is connected to the C-phase power line, and the phase detection units are configured to detect the voltage of the corresponding power line.
Wherein the control unit 60 is connected to the power supply unit 40, the first phase detection unit 31, the second phase detection unit 32, the third phase detection unit 33, the first driving unit 21, the second driving unit 22, the third driving unit 23, and the over-and-under voltage parameter calibration unit 50; the control unit 60 is configured to compare the phase voltage collected by a phase detection unit with the calibration voltage after the over-voltage and under-voltage parameter calibration unit 50 enters the calibration state, and control the corresponding driving unit to operate the corresponding switching unit according to the comparison result.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an embodiment of the power supply unit 40 in fig. 1, where the power supply unit 40 includes a rectifying module 41 and a sequential power supply module 42.
Three input ends of the rectifying module 41 are respectively connected with three-phase power transmission lines (A-phase power transmission line, B-phase power transmission line and C-phase power transmission line); the sequential power supply module 42 is connected to the output end of the rectifying module 41, and the sequential power supply module 42 includes a first power supply end VCC1, a second power supply end VCC2, and a third power supply end VCC3, where the first power supply end VCC1 is connected to the first switching unit 11, the second power supply end VCC2 is connected to the second switching unit 12, the third power supply end VCC3 is connected to the third switching unit 13, and the sequential power supply module 42 is configured to sequentially supply power to the first switching unit 11, the second switching unit 12, and the third switching unit 3 in the order of the first power supply end VCC1, the second power supply end VCC2, and the third power supply end VCC 3.
Specifically, the sequential power supply module 42 includes a first diode D1, a second diode D2, a first energy storage capacitor C1, a second energy storage capacitor C2, and a third energy storage capacitor C3, where an input end of the first diode D1 is connected to an output end of the rectifying module 41 and to the first power supply end VCC1, an input end of the second diode D2 is connected to an output end of the first diode D1 and to the second power supply end VCC2, and an output end of the second diode D2 is connected to the third power supply end VCC3; the first end of the first energy storage capacitor C1 is connected with the first power supply end VCC1, the first end of the second energy storage capacitor C2 is connected with the second power supply end VCC2, the first end of the third energy storage capacitor C3 is connected with the third power supply end VCC3, and the second ends of the first energy storage capacitor C1, the second energy storage capacitor C2 and the third energy storage capacitor C3 are grounded GND.
It can be understood that the first switch unit 11, the second switch unit 12 and the third switch unit 13 are all relays, and the first diode D1 and the second diode D2 are isolated to prevent the current from flowing backwards. Therefore, when the three relays are closed in the power supply sequence of VCC1, VCC2, VCC3, the three relay closures do not affect each other. Because of using three-phase zero crossing point closing technology, ABC three phases have a closing sequence due to the existence of phase difference, and the action condition of the used magnetic latching relay is a pulse, no energy is consumed before and after the pulse appears, and the sequence power supply module 42 and the control unit 60 designed according to the characteristic control the three driving units to enable the corresponding relays to be closed and opened in sequence to be matched, so that the relays are not affected each other.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the power supply unit 40 in fig. 1, where the power supply unit 40 includes a rectifying module 41 and a sequential power supply module 42.
Three input ends of the rectifying module 41 are respectively connected with three-phase power transmission lines (A-phase power transmission line, B-phase power transmission line and C-phase power transmission line); the sequential power supply module 42 comprises a first diode D1, a second diode D2, a first energy storage capacitor C1, a second energy storage capacitor C2 and a third energy storage capacitor C3, wherein an input end of the first diode D1 is connected with an output end of the rectifying module 41 and is connected with a first power supply end VCC1, an input end of the second diode D2 is connected with an output end of the first diode D1 and is connected with a second power supply end VCC2, and an output end of the second diode D2 is connected with a third power supply end VCC3; the first end of the first energy storage capacitor C1 is connected with the first power supply end VCC1, the first end of the second energy storage capacitor C2 is connected with the second power supply end VCC2, the first end of the third energy storage capacitor C3 is connected with the third power supply end VCC3, and the second ends of the first energy storage capacitor C1, the second energy storage capacitor C2 and the third energy storage capacitor C3 are grounded GND.
Further, in the present embodiment, the sequential power supply module 42 further includes a voltage stabilizing tube C0, a first end of the voltage stabilizing tube C0 is connected to the output end of the rectifying module 41, a second end of the voltage stabilizing tube C0 is grounded GND, and the voltage stabilizing tube C0 is configured to keep the voltage output by the rectifying module 41 stable.
Further, in the present embodiment, the power supply unit 40 further includes a low dropout linear voltage regulator module 43, and an input terminal of the low dropout linear voltage regulator module 43 is connected to an output terminal of the second diode D2, and an output terminal of the low dropout linear voltage regulator module 43 is configured to output a stabilized voltage (the power VCC 4). The power supply voltage VCC4 may supply power to other units in the overvoltage/undervoltage protection circuit 100, such as a phase detection unit, a driving unit, an overvoltage/undervoltage parameter calibration unit, a control unit, and the like.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the rectifying module 41 in fig. 2 and 3, where the rectifying module 41 includes a first rectifying diode D3, a second rectifying diode D4, and a third rectifying diode D5.
The input end of the first rectifying diode D3 is connected with an A-phase power line; the input end of the second rectifying diode D4 is connected with a B-phase power line; the input end of the third rectifying diode D5 is connected with a C-phase power line; the output ends of the first rectifying diode D3, the second rectifying diode D4 and the third rectifying diode D5 are connected as output ends of the rectifying module 41 to be connected to the sequential power supply module 42, and the first rectifying diode D3, the second rectifying diode D4 and the third rectifying diode D5 mainly convert alternating current into direct current.
Optionally, in an embodiment, the rectifying module 41 further includes a first step-down unit, a second step-down unit, and a third step-down unit. The first voltage reduction unit comprises a first voltage reduction capacitor C4 and a first discharge resistor R1, wherein a first end of the first voltage reduction capacitor C4 is connected with a first power transmission line (A-phase power transmission line), a second end of the first voltage reduction capacitor C4 is connected with an input end of a first rectifying diode D3, a first end of the first discharge resistor R1 is connected with a first end of the first voltage reduction capacitor C4, and a second end of the first discharge resistor R1 is connected with a second end of the first voltage reduction capacitor C4; the second voltage reduction unit comprises a second voltage reduction capacitor C5 and a second discharge resistor R2, wherein the first end of the second voltage reduction capacitor C5 is connected with a second power transmission line (B-phase power transmission line), the second end of the second voltage reduction capacitor C5 is connected with the input end of a second rectifier diode D4, the first end of the second discharge resistor R2 is connected with the first end of the second voltage reduction capacitor C5, and the second end of the second discharge resistor R2 is connected with the second end of the second voltage reduction capacitor C5; the third step-down unit comprises a third step-down capacitor C6 and a third discharge resistor R3, wherein a first end of the third step-down capacitor C6 is connected with a third power transmission line (C-phase power transmission line), a second end of the third step-down capacitor C6 is connected with an input end of a third rectifier diode D5, a first end of the third discharge resistor R3 is connected with a first end of the third step-down capacitor C6, and a second end of the third discharge resistor R3 is connected with a second end of the third step-down capacitor C6.
It can be understood that the voltage-reducing units are rc voltage-reducing units, and the capacitor in each rc voltage-reducing unit limits the maximum operating current by using the capacitive reactance generated under the ac signal, and the resistor is used for discharging the capacitor.
Optionally, in an embodiment, the rectifying module 41 further includes a first current limiting resistor R4, a second current limiting resistor R5, and a third current limiting resistor R6. The first end of the first current limiting resistor R4 is connected with the first power transmission line, and the second end of the first current limiting resistor R4 is connected with the first end of the first voltage dropping capacitor C4; the first end of the second current limiting resistor R5 is connected with a second power transmission line, and the second end of the second current limiting resistor R5 is connected with the first end of the second voltage dropping capacitor C5; the first end of the third current limiting resistor R6 is connected with a third power transmission line, and the second end of the third current limiting resistor R6 is connected with the first end of the third voltage dropping capacitor C6.
Optionally, in an embodiment, the rectifying module 41 further includes a first surge protection resistor R7, a second surge protection resistor R8, a third surge protection resistor R9, and a fourth surge protection resistor R10, where a first end of the first surge protection resistor R7 is connected to the a-phase power line; the first end of the second surge protection resistor R8 is connected with a B-phase power line; the first end of the third surge protection resistor R9 is connected with a C-phase power line; the first end of the fourth surge protection resistor R10 is connected with the second ends of the first surge protection resistor R7, the second surge protection resistor R8 and the third surge protection resistor R9, and the second end of the fourth surge protection resistor R10 is grounded GND; the first surge protection resistor R7, the second surge protection resistor R8, the third surge protection resistor R9 and the fourth surge protection resistor R10 are piezoresistors and are mainly used for forming three-phase cascading front-end surge protection.
Optionally, in an embodiment, the rectifying module 41 further includes a sixth diode D6, a seventh diode D7, and an eighth diode D8, an input end of the sixth diode D6 is grounded GND, and an output end of the sixth diode D6 is connected to an input end of the first rectifying diode D3; the input end of the seventh diode D7 is grounded GND, and the output end of the seventh diode D7 is connected with the input end of the second rectifying diode D4; the input end of the eighth diode D8 is grounded GND, and the output end of the eighth diode D8 is connected to the input end of the third rectifier diode D5.
The overvoltage and undervoltage protection circuit provided in this embodiment includes: the first switch unit, the second switch unit and the third switch unit are respectively arranged on the paths of the three-phase power transmission line; the power supply unit comprises a sequential power supply module, the sequential power supply module comprises a first power supply end, a second power supply end and a third power supply end, the first power supply end is connected with the first switch unit, the second power supply end is connected with the second switch unit, the third power supply end is connected with the third switch unit, and the sequential power supply module is configured to supply power to the first switch unit, the second switch unit and the third switch unit in sequence according to the sequence of the first power supply end, the second power supply end and the third power supply end. Through the mode, when the three relays are closed according to the power supply sequence of VCC1, VCC2 and VCC3 through the three formed power supply ends, the closing of the three relays is not affected. Because of using the three-phase zero crossing point closing technology, ABC three phases have a closing sequence due to the existence of phase difference, the action condition of the used magnetic latching relay is a pulse, no energy is consumed before and after the pulse appears, and the sequence power supply module and the control unit designed according to the characteristic control the three driving units to enable the corresponding relays to be closed and opened in sequence to be matched, so that the relays are not affected each other.
Referring to fig. 5, fig. 5 is a schematic diagram of an embodiment of the phase detection unit in fig. 1, and the phase detection unit 30 (the first phase detection unit 31, the second phase detection unit 32, and the third phase detection unit 33 in the above embodiment) includes a first voltage dividing resistor R11, a voltage dividing diode D9, and a second resistor R12.
Wherein, the first end of the first voltage dividing resistor R11 is connected to the power lines of the corresponding phases (such as the a-phase power line, the B-phase power line and the C-phase power line in the above embodiment); the input end of the voltage dividing diode D9 is connected with the second end of the first voltage dividing resistor R11, and the output end of the voltage dividing diode D9 is connected with the control unit 60; the first end of the second voltage dividing resistor R12 is connected with the output end of the voltage dividing diode D9, and the second end of the second voltage dividing resistor R12 is grounded GND.
It is understood that the first voltage dividing resistor R11 and the second voltage dividing resistor R12 constitute voltage dividing resistors for voltage sampling, and the voltage dividing diode D9 is turned on unidirectionally so as to generate a forward half-wave signal.
Optionally, in an embodiment, the phase detecting unit 30 further includes a voltage stabilizing capacitor C7, a first end of the voltage stabilizing capacitor C7 is connected to an output end of the voltage dividing diode D9, and a second end of the voltage stabilizing capacitor C7 is grounded GND. The voltage stabilizing capacitor C7 is mainly used for smoothing the half-wave signal.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the over-voltage and under-voltage parameter calibration unit 50 in fig. 1, where the over-voltage and under-voltage parameter calibration unit 50 includes a pull-up resistor R13, a control switch SW and a filter capacitor C8.
Wherein, the first end of the pull-up resistor R13 inputs the calibration voltage VCC5, and the second end of the pull-up resistor R13 is connected to the control unit 60; the first end of the control switch SW is connected with the second end of the pull-up resistor R13, and the second end of the control switch SW is grounded to GND; the first end of the filter capacitor C8 is connected with the second end of the pull-up resistor R13, and the second end of the filter capacitor C8 is grounded to GND.
It will be appreciated that the control unit 60 is configured to detect the voltage at the second end of the pull-up resistor R13, and if the voltage is low, the calibration mode is performed, and if the voltage is high, the operation is normal. The pull-up resistor R13 is a pull-up resistor, and is used for providing a high level, and the filter capacitor C8 is a filter capacitor. Optionally, the control switch SW may be a jump cap, and shorting the two ends of the jump cap pulls the level of the second end of the pull-up resistor R13 to a low level, and enters the calibration state.
Referring to fig. 7, fig. 7 is a schematic structural diagram of the switch unit in fig. 1, and the first switch unit 11, the second switch unit 12, and the third switch unit 13 in this embodiment are relays.
Specifically, the incoming and outgoing terminals of the relay are connected to respective power lines, the VDD pin is connected to respective power supply terminals (VCC 1, VCC2 or VCC 3) of the sequential power supply module 42 in the power supply unit 40, and the INA pin and the INB pin are connected to respective driving units (21, 22 or 23).
Referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a power grid system 200 provided in the present application, where the power grid system 200 includes an overvoltage/undervoltage protection circuit 100 as in the above embodiment.
It will be appreciated that the power grid system 200 is a three-phase power supply system, and the transmission lines may include a-phase transmission line, B-phase transmission line, C-phase transmission line, and ground line, and power supply devices, loads, and the like may be included in the entire power grid system 200.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (14)
1. An over-voltage and under-voltage protection circuit, which is characterized by comprising:
the first switch unit, the second switch unit and the third switch unit are respectively arranged on the paths of the three-phase power transmission line;
the power supply unit comprises a sequential power supply module, the sequential power supply module comprises a first power supply end, a second power supply end and a third power supply end, the first power supply end is connected with the first switch unit, the second power supply end is connected with the second switch unit, the third power supply end is connected with the third switch unit, and the sequential power supply module is configured to supply power to the first switch unit, the second switch unit and the third switch unit in sequence according to the sequence of the first power supply end, the second power supply end and the third power supply end.
2. The overvoltage/undervoltage protection circuit of claim 1, wherein,
the power supply unit comprises a rectifying module, and three input ends of the rectifying module are respectively connected with the three-phase power transmission line;
the sequential power supply module comprises a first diode, a second diode, a first energy storage capacitor, a second energy storage capacitor and a third energy storage capacitor, wherein the input end of the first diode is connected with the output end of the rectifying module and is connected with the first power supply end, the input end of the second diode is connected with the output end of the first diode and is connected with the second power supply end, and the output end of the second diode is connected with the third power supply end; the first end of the first energy storage capacitor is connected with the first power supply end, the first end of the second energy storage capacitor is connected with the second power supply end, the first end of the third energy storage capacitor is connected with the third power supply end, and the second ends of the first energy storage capacitor, the second energy storage capacitor and the third energy storage capacitor are grounded.
3. The overvoltage/undervoltage protection circuit of claim 2, wherein,
the sequential power supply module further comprises a voltage stabilizing tube, a first end of the voltage stabilizing tube is connected with the output end of the rectifying module, and a second end of the voltage stabilizing tube is grounded.
4. The overvoltage/undervoltage protection circuit of claim 2, wherein,
the power supply unit further comprises a low-dropout linear voltage stabilizing module, wherein the input end of the low-dropout linear voltage stabilizing module is connected with the output end of the second diode, and the output end of the low-dropout linear voltage stabilizing module is used for outputting stable voltage.
5. The overvoltage/undervoltage protection circuit of claim 2, wherein,
the rectifying module includes:
the input end of the first rectifying diode is connected with a first power transmission line of the three-phase power transmission line;
the input end of the second rectifying diode is connected with a second power transmission line of the three-phase power transmission line;
the input end of the third rectifying diode is connected with a third power transmission line of the three-phase power transmission line;
the output ends of the first rectifying diode, the second rectifying diode and the third rectifying diode are connected to serve as the output end of the rectifying module.
6. The overvoltage/undervoltage protection circuit of claim 5, wherein,
the rectification module further includes:
the first voltage reduction unit comprises a first voltage reduction capacitor and a first discharge resistor, wherein a first end of the first voltage reduction capacitor is connected with the first power transmission line, a second end of the first voltage reduction capacitor is connected with the input end of the first rectifier diode, a first end of the first discharge resistor is connected with the first end of the first voltage reduction capacitor, and a second end of the first discharge resistor is connected with the second end of the first voltage reduction capacitor;
the first end of the second discharging resistor is connected with the first end of the second voltage reduction capacitor, and the second end of the second discharging resistor is connected with the second end of the second voltage reduction capacitor;
the third voltage reduction unit comprises a third voltage reduction capacitor and a third discharge resistor, wherein the first end of the third voltage reduction capacitor is connected with the third power transmission line, the second end of the third voltage reduction capacitor is connected with the input end of the third rectifier diode, the first end of the third discharge resistor is connected with the first end of the third voltage reduction capacitor, and the second end of the third discharge resistor is connected with the second end of the third voltage reduction capacitor.
7. The overvoltage and undervoltage protection circuit of claim 6, wherein,
the rectification module further includes:
the first end of the first current limiting resistor is connected with the first power transmission line, and the second end of the first current limiting resistor is connected with the first end of the first buck capacitor;
the first end of the second current limiting resistor is connected with the second power transmission line, and the second end of the second current limiting resistor is connected with the first end of the second buck capacitor;
and the first end of the third current limiting resistor is connected with the third power transmission line, and the second end of the third current limiting resistor is connected with the first end of the third buck capacitor.
8. The overvoltage/undervoltage protection circuit of claim 5, wherein,
the rectification module further includes:
the first end of the first surge protection resistor is connected with the first power transmission line;
the first end of the second surge protection resistor is connected with the second power transmission line;
the first end of the third surge protection resistor is connected with the third power transmission line;
the first end of the fourth surge protection resistor is connected with the second ends of the first surge protection resistor, the second surge protection resistor and the third surge protection resistor, and the second end of the fourth surge protection resistor is grounded;
the first surge protection resistor, the second surge protection resistor, the third surge protection resistor and the fourth surge protection resistor are piezoresistors.
9. The overvoltage/undervoltage protection circuit of claim 1, wherein,
the undervoltage protection circuit includes still including:
the first phase detection unit, the second phase detection unit and the third phase detection unit are respectively connected with the three-phase power transmission line;
the first driving unit is connected with the first switch unit, the second driving unit is connected with the second switch unit, and the third driving unit is connected with the third switch unit;
an over-voltage and under-voltage parameter calibration unit;
the control unit is connected with the power supply unit, the first phase detection unit, the second phase detection unit, the third phase detection unit, the first driving unit, the second driving unit, the third driving unit and the over-voltage and under-voltage parameter calibration unit;
the control unit is configured to compare the phase voltage acquired by the phase detection unit with the calibration voltage after the overvoltage and undervoltage parameter calibration unit enters the calibration state, and control the corresponding driving unit to operate the corresponding switching unit according to the comparison result.
10. The overvoltage/undervoltage protection circuit of claim 9, wherein,
the phase detection unit includes:
the first end of the first voltage dividing resistor is connected with a power transmission line of a corresponding phase;
the input end of the voltage dividing diode is connected with the second end of the first voltage dividing resistor, and the output end of the voltage dividing diode is connected with the control unit;
and the first end of the second voltage dividing resistor is connected with the output end of the voltage dividing diode, and the second end of the second voltage dividing resistor is grounded.
11. The overvoltage/undervoltage protection circuit of claim 10, wherein,
the phase detection unit further comprises a voltage stabilizing capacitor, a first end of the voltage stabilizing capacitor is connected with the output end of the voltage dividing diode, and a second end of the voltage stabilizing capacitor is grounded.
12. The overvoltage/undervoltage protection circuit of claim 9, wherein,
the over-voltage and under-voltage parameter calibration unit comprises:
the first end of the pull-up resistor is input with the calibration voltage, and the second end of the pull-up resistor is connected with the control unit;
and the first end of the control switch is connected with the second end of the pull-up resistor, and the second end of the control switch is grounded.
13. The overvoltage/undervoltage protection circuit of claim 12, wherein,
the over-voltage and under-voltage parameter calibration unit further comprises a filter capacitor, wherein a first end of the filter capacitor is connected with a second end of the pull-up resistor, and a second end of the filter capacitor is grounded.
14. A power grid system comprising an overvoltage and undervoltage protection circuit as recited in any one of claims 1-13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320061779.2U CN219164207U (en) | 2023-01-09 | 2023-01-09 | Overvoltage and undervoltage protection circuit and power grid system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320061779.2U CN219164207U (en) | 2023-01-09 | 2023-01-09 | Overvoltage and undervoltage protection circuit and power grid system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219164207U true CN219164207U (en) | 2023-06-09 |
Family
ID=86637874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320061779.2U Active CN219164207U (en) | 2023-01-09 | 2023-01-09 | Overvoltage and undervoltage protection circuit and power grid system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219164207U (en) |
-
2023
- 2023-01-09 CN CN202320061779.2U patent/CN219164207U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103151910B (en) | Undervoltage protection circuit, under-voltage protection method and switching power supply | |
| US11552468B2 (en) | Electrical device with power quality event protection and associated method | |
| JP4845910B2 (en) | Earth leakage breaker | |
| JP5955484B1 (en) | Converter unit system and converter unit | |
| EP3118877B1 (en) | Latching-relay drive circuit | |
| US20140184191A1 (en) | System and device for reducing standby power consumption | |
| US11909308B2 (en) | Power conversion circuit, method for controlling power conversion circuit, and transformer | |
| CN219164207U (en) | Overvoltage and undervoltage protection circuit and power grid system | |
| CN204068191U (en) | AFDD fault electric arc protector | |
| CN102959670B (en) | Impulse current restraining device and control method thereof | |
| CN100442621C (en) | A rectifying circuit start-up protector | |
| CN214069550U (en) | Overcurrent detection protection device for vehicle electrical equipment | |
| CN111181152B (en) | System and method for dynamically switching loads of a current transformer circuit | |
| CN102201743A (en) | Motor device, fan and power circuit | |
| Justin et al. | Protection of a Disturbed Electric Network Using a Solid State Protective Relay | |
| CN216794605U (en) | Over-voltage and under-voltage protection circuit | |
| CN215932000U (en) | Current detection circuit and electrical equipment | |
| CN2269016Y (en) | Separate motor protector without external power | |
| CN220439493U (en) | Control circuit of contactor | |
| CN212231331U (en) | Power supply circuit and over-voltage and under-voltage protector | |
| CN113791348B (en) | Phase signal detection device of alternating current generator | |
| CN218350371U (en) | Terminal with novel hardware residual voltage detection function | |
| CN209982351U (en) | MOS system voltage stabilizer | |
| CN219760876U (en) | DC stabilized power supply device and stabilized voltage equipment | |
| CN114301030A (en) | Over-voltage and under-voltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |