CN116613978A - Power supply surge protection circuit - Google Patents
Power supply surge protection circuit Download PDFInfo
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- CN116613978A CN116613978A CN202310513365.3A CN202310513365A CN116613978A CN 116613978 A CN116613978 A CN 116613978A CN 202310513365 A CN202310513365 A CN 202310513365A CN 116613978 A CN116613978 A CN 116613978A
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- 230000001629 suppression Effects 0.000 claims description 20
- 230000001052 transient effect Effects 0.000 claims description 20
- 230000005670 electromagnetic radiation Effects 0.000 claims description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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Abstract
The embodiment of the application provides a power supply surge protection circuit, wherein when a differential mode surge is generated between a positive power supply input end and a negative power supply input end, a second surge protection module is matched with a third surge protection module, and differential mode surge energy is discharged to carry out differential mode surge protection; when a common-mode surge is generated between the positive input end of the power supply and the grounding end, the first surge protection module is matched with the second surge protection module, the common-mode surge energy is discharged to conduct common-mode surge protection, and when a common-mode surge is generated between the negative input end of the power supply and the grounding end, the first surge protection module is matched with the third surge protection module, and the common-mode surge energy is discharged to conduct common-mode surge protection. That is, the power supply surge protection circuit provided by the embodiment of the application utilizes the differential mode surge protection module when common mode surge protection is performed, so that the number of devices and the PCB layout space of the common mode surge protection can be saved, and the discharging path of the common mode surge protection is shorter.
Description
Technical Field
The application relates to the technical field of power supply protection, in particular to a power supply surge protection circuit.
Background
Some terminal devices (such as monitoring devices) used outdoors may be damaged by lightning surges in thunderstorm weather, and the surge is a signal of peak exceeding a stable value instantaneously, and is a spike pulse with high rising speed and short duration, so that the surge possibly suffered is necessary to be protected.
The current surge protection means is generally to add a differential mode surge protection device between positive and negative power lines of a power supply of an apparatus to discharge differential mode surge energy, and in addition, a common mode surge protection device is required to be added between the power line and a ground line to discharge common mode surge energy.
However, the above means for surge protection requires a large number of devices to be laid out on the printed circuit board (Printed Circuit Board, PCB), and occupies a large area, resulting in a small layout space.
Disclosure of Invention
The embodiment of the application provides a power supply surge protection circuit which is used for saving the number of devices for surge protection and the layout space of a PCB.
In a first aspect, an embodiment of the present application provides a power supply surge protection circuit, including: the device comprises a first surge protection module, a second surge protection module, a third surge protection module, a first filtering module and a first residual voltage processing module;
the first end of the third surge protection module is connected with the positive power input end and the first end of the second surge protection module respectively, the second end of the third surge protection module is connected with the negative power input end, the third end of the third surge protection module is connected with the second end of the second surge protection module and the first end of the first surge protection module respectively, and the second end of the first surge protection module is connected with the grounding end; the first end of the first filtering module is connected with the positive input end of the power supply, the second end of the first filtering module is connected with the negative input end of the power supply, the third end of the first filtering module is connected with the first end of the first residual voltage processing module, and the fourth end of the first filtering module is connected with the second end of the first residual voltage processing module;
the first surge protection module is used for being matched with the second surge protection module when a common mode surge is generated between the positive input end of the power supply and the grounding end, conducting a passage between the first end of the second surge protection module and the second end of the first surge protection module, and being matched with the third surge protection module when a common mode surge is generated between the negative input end of the power supply and the grounding end, conducting a passage between the second end of the third surge protection module and the second end of the first surge protection module, and discharging common mode surge energy;
the second surge protection module is used for being matched with the third surge protection module when a differential mode surge is generated between the positive power input end and the negative power input end, conducting a passage between the first end of the second surge protection module and the second end of the third surge protection module, discharging differential mode surge energy and generating residual voltage;
the first filtering module is used for filtering noise;
the first residual pressure processing module is used for reducing the residual pressure.
In some embodiments, the second surge protection module includes a gas discharge tube and a first capacitor connected in parallel, and the third surge protection module includes: m gas discharge tubes and (M-1) first capacitors;
the first end of the gas discharge tube and the first capacitor which are connected in parallel are used as the first end of the second surge protection module, and the second end of the gas discharge tube and the first capacitor which are connected in parallel are used as the second end of the second surge protection module;
the M gas discharge tubes are connected in series between the second end of the second surge protection module and the negative power input end, one end of the gas discharge tube connected with the second end of the second surge protection module is used as the third end of the third surge protection module, one end of the gas discharge tube connected with the negative power input end is used as the second end of the third surge protection module, the first end of the (M-1) first capacitor is used as the first end of the third surge protection module, the second ends of the (M-1) first capacitors are respectively connected with each node, wherein each node is respectively a midpoint of (M-1) of the M gas discharge tubes connected in series, and M is a positive integer greater than or equal to 2.
In some embodiments, the first surge protection module includes: a first varistor;
the first end of the first piezoresistor is used as the first end of the first surge protection module, and the second end of the first piezoresistor is used as the second end of the first surge protection module.
In some embodiments, further comprising: a second varistor;
the other end of the gas discharge tube connected with the negative input end of the power supply is connected with the first end of the second piezoresistor, and the second end of the second piezoresistor is connected with the grounding end.
In some embodiments, the first filtering module comprises: a second capacitance and a common mode inductance;
the first end of the second capacitor is used as the first end of the first filter module and is connected with the first end of the common-mode inductor, the second end of the second capacitor is used as the second end of the first filter module and is connected with the second end of the common-mode inductor, the third end of the common-mode inductor is used as the third end of the first filter module, and the fourth end of the common-mode inductor is used as the fourth end of the first filter module.
In some embodiments, the first residual voltage processing module includes a first bidirectional transient suppression diode;
the first end of the first bidirectional transient suppression diode is used as the first end of the first residual voltage processing module, and the second end of the first bidirectional transient suppression diode is used as the second end of the first residual voltage processing module.
In some embodiments, further comprising: the second filtering module and the second residual voltage processing module;
the first end of the second filtering module is connected with the first end of the first residual voltage processing module, the second end of the second filtering module is connected with the second end of the first residual voltage processing module, the third end of the second filtering module is connected with the first end of the second residual voltage processing module, and the fourth end of the second filtering module is connected with the second end of the second residual voltage processing module;
the second filtering module is used for reducing electromagnetic radiation;
and the second residual pressure processing module is used for reducing the residual pressure again.
In some embodiments, the second filtering module comprises: the third capacitor, the fourth capacitor and the differential mode inductor;
the first end of the third capacitor is used as the first end of the second filter module and is connected with the first end of the differential mode inductor, the second end of the third capacitor is used as the second end of the second filter module, the first end of the fourth capacitor is used as the third end of the second filter module and is connected with the second end of the differential mode inductor, and the second end of the fourth capacitor is used as the fourth end of the second filter module and is connected with the second end of the third capacitor.
In some embodiments, the second residual voltage processing module includes a second bidirectional transient suppression diode;
the first end of the second bidirectional transient suppression diode is used as the first end of the second residual voltage processing module, and the second end of the second bidirectional transient suppression diode is used as the second end of the second residual voltage processing module.
In some embodiments, further comprising a first fuse and a second fuse;
the first end of the first filtering module is connected with the positive power input end through the first fuse, and the second end of the first filtering module is connected with the negative power input end through the second fuse.
According to the power supply surge protection circuit provided by the embodiment of the application, when a differential mode surge is generated between the positive input end and the negative input end of the power supply, the second surge protection module is matched with the third surge protection module, and differential mode surge energy is discharged to carry out differential mode surge protection; when a common-mode surge is generated between the positive input end of the power supply and the grounding end, the first surge protection module is matched with the second surge protection module, the common-mode surge energy is discharged to conduct common-mode surge protection, and when a common-mode surge is generated between the negative input end of the power supply and the grounding end, the first surge protection module is matched with the third surge protection module, and the common-mode surge energy is discharged to conduct common-mode surge protection. That is, the power supply surge protection circuit provided by the embodiment of the application utilizes the differential mode surge protection module when common mode surge protection is performed, so that the number of devices and the PCB layout space of the common mode surge protection can be saved, and the discharging path of the common mode surge protection is shorter.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the embodiments will be briefly described 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 structural diagram of a power surge protection circuit according to an embodiment of the present application;
fig. 2a is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application;
fig. 2b is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another power surge protection circuit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
With the development of intelligent operation and maintenance services, the spherical camera holder is increasingly installed in high-altitude scenes of iron towers due to the service demands of telecommunication, electric power, farmland protection and the like. Most of iron towers are built in mountains, suburban areas, unmanned areas and other terrains, global climate is warmed in recent years, thunderstorm weather is increased, equipment on the iron towers is easily damaged by lightning surges, and if on-site construction wiring protection is improper, the equipment is more easily damaged by the lightning surges.
Because the current surge protection of the equipment power supply adopts more protection devices, the layout space on the PCB is smaller, the embodiment of the application provides a power supply surge protection circuit which is used for saving the PCB layout space for power supply surge protection.
As shown in fig. 1, a power supply surge protection circuit according to an embodiment of the present application includes: a first surge protection module 101, a second surge protection module 102, a third surge protection module 103, a first filtering module 104, and a first residual voltage processing module 105;
the first end of the third surge protection module 103 is connected with the positive power input end VIN_IN and the first end of the second surge protection module 102 respectively, the second end of the third surge protection module 103 is connected with the negative power input end VIN_GND, the third end of the third surge protection module 103 is connected with the second end of the second surge protection module 102 and the first end of the first surge protection module 101 respectively, and the second end of the first surge protection module 101 is connected with the grounding end PE; the first end of the first filtering module 104 is connected with the positive power input end VIN_IN, the second end of the first filtering module 104 is connected with the negative power input end VIN_GND, the third end of the first filtering module 104 is connected with the first end of the first residual voltage processing module 105, and the fourth end of the first filtering module 104 is connected with the second end of the first residual voltage processing module 105;
the first surge protection module 101 is configured to cooperate with the second surge protection module 102 when a common mode surge is generated between the positive power input terminal vin_in and the ground terminal PE, conduct a path between the first end of the second surge protection module 102 and the second end of the first surge protection module 101, and cooperate with the third surge protection module 103 when a common mode surge is generated between the negative power input terminal vin_gnd and the ground terminal PE, conduct a path between the second end of the third surge protection module 103 and the second end of the first surge protection module 101, and discharge the common mode surge energy;
the second surge protection module 102 is configured to, when a differential mode surge is generated between the positive power input terminal vin_in and the negative power input terminal vin_gnd, cooperate with the third surge protection module 103, conduct a path between the first end of the second surge protection module 102 and the second end of the third surge protection module 103, discharge differential mode surge energy, and generate residual voltage;
a first filtering module 104, configured to filter noise;
the first residual pressure processing module 105 is used for reducing residual pressure.
According to the power supply surge protection circuit provided by the embodiment of the application, when a differential mode surge is generated between the positive input end and the negative input end of the power supply, the second surge protection module is matched with the third surge protection module, and differential mode surge energy is discharged to carry out differential mode surge protection; when a common-mode surge is generated between the positive input end of the power supply and the grounding end, the first surge protection module is matched with the second surge protection module, the common-mode surge energy is discharged to conduct common-mode surge protection, and when a common-mode surge is generated between the negative input end of the power supply and the grounding end, the first surge protection module is matched with the third surge protection module, and the common-mode surge energy is discharged to conduct common-mode surge protection. That is, the power supply surge protection circuit provided by the embodiment of the application utilizes the differential mode surge protection module when common mode surge protection is performed, so that the number of devices and the PCB layout space of the common mode surge protection can be saved, and the discharging path of the common mode surge protection is shorter.
In an implementation, the second surge protection module 102 includes a gas discharge tube GDT1 and a first capacitor C1 connected in parallel, and the third surge protection module 103 includes: m gas discharge tubes GDT1 and (M-1) first capacitors C1;
the first ends of the gas discharge tube GDT1 and the first capacitor C1 connected in parallel serve as the first ends of the second surge protection module 102, and the second ends of the gas discharge tube GDT1 and the first capacitor C1 connected in parallel serve as the second ends of the second surge protection module 102;
the M gas discharge tubes GDT1 are connected in series between the second end of the second surge protection module 102 and the negative power input end VIN_GND, one end of the gas discharge tube GDT1 connected with the second end of the second surge protection module 102 is used as the third end of the third surge protection module 103, one end of the gas discharge tube GDT1 connected with the negative power input end VIN_GND is used as the second end of the third surge protection module 103, (M-1) first ends of the first capacitors C1 are used as the first ends of the third surge protection module 103, and the second ends of the (M-1) first capacitors C1 are respectively connected with nodes, wherein each node is respectively a (M-1) midpoint in the M gas discharge tubes GDT1 connected in series, and M is a positive integer greater than or equal to 2.
As an example, when m=2, as shown IN fig. 2a, when a differential mode surge is generated between the positive input terminal vin_in and the negative input terminal vin_gnd, each first capacitor C1 is turned on, and breakdown conduction of each gas discharge tube GDT1 is accelerated, and the breakdown conduction sequence of each gas discharge tube GDT1 is typically IN turn from bottom to top, so that the residual voltage can be reduced as a whole.
In addition, compared with the differential mode surge protection of a single piezoresistor type, the structure is less prone to cause fire disaster due to short circuit, is multiple times of the continuous current maintaining voltage of the single gas discharge tube GDT1 during low-voltage power supply, and does not cause continuous current problems during surge.
In addition, in the embodiment of the application, a plurality of gas discharge tubes GDT1 can be connected in series, or one combined cascade gas discharge can be adopted, and the two effects are equivalent.
In an implementation, as shown in fig. 2a, the first surge protection module 101 may include: a first varistor RV1; the first end of the first varistor RV1 serves as the first end of the first surge protection module 101, and the second end of the first varistor RV1 serves as the second end of the first surge protection module 101.
When a common mode surge is generated between the positive power input terminal vin_in and the ground terminal PE, the surge energy is divided into two flow paths, wherein the first path is through the uppermost gas discharge tube GDT1 (i.e., the gas discharge tube GDT1 connected to the positive power input terminal vin_in) and the first varistor RV1, so as to discharge the common mode surge energy, and the second path is through the uppermost first capacitor C1 and the first varistor RV1, so as to discharge the common mode surge energy. Because the common mode protection also adopts the devices with differential mode protection, on one hand, the cost and the number of the devices can be saved, and on the other hand, the risk of the short circuit failure of the piezoresistor is also solved.
Because the action voltage of the piezoresistor is higher, the action voltage is high when common mode protection is carried out in the embodiment of the application, the lap joint requirement of a power line can be met, and the AC500V insulation voltage-resistant requirement can also be met.
It should be noted that fig. 2a is only an example, and any modification may be performed based on the same inventive concept, for example, the circuit structure shown in fig. 2b may be further configured, where the first varistor RV1 may be further connected to other gas discharge tubes GDT1, and the same circuit functions may be implemented, which will not be further described herein.
In a specific implementation, the method can further include: a second varistor RV2; the other end of the gas discharge tube GDT1 connected with the negative input end VIN_GND of the power supply is connected with the first end of the second piezoresistor RV2, and the second end of the second piezoresistor RV2 is connected with the grounding end PE.
As an example, when m=5, as shown IN fig. 3, when a differential mode surge is generated between the positive power input terminal vin_in and the negative power input terminal vin_gnd, each first capacitor C1 is turned on, breakdown conduction of each gas discharge tube GDT1 is accelerated, and breakdown conduction sequence of each gas discharge tube GDT1 is typically IN turn from bottom to top, so that the residual voltage can be reduced as a whole, so that the post-stage circuit can bear the residual voltage level, and reliability of power surge protection of the device can be improved.
When a common mode surge is generated between the power supply positive input terminal vin_in and the ground terminal PE, the surge energy flows through the uppermost gas discharge tube GDT1 (i.e., the gas discharge tube GDT1 connected to the power supply positive input terminal vin_in) and the first varistor RV1, and flows through the uppermost first capacitor C1 and the first varistor RV1, thereby discharging the surge energy; when a common mode surge is generated between the power negative input terminal vin_gnd and the ground terminal PE, the surge energy flows through the lowermost gas discharge tube GDT1 (i.e., the gas discharge tube GDT1 connected to the power negative input terminal vin_gnd) and the second varistor RV2, thereby discharging the surge energy.
That is, based on the above circuit structure, the common mode surge protection belongs to a symmetrical structure design, and no matter a common mode surge is generated between the positive power input terminal vin_in and the ground terminal PE, or a common mode surge is generated between the negative power input terminal vin_gnd and the ground terminal PE, the surge energy can be effectively discharged, and the surge energy is discharged from the positive power input terminal vin_in to the ground terminal PE, and the surge energy is discharged from the negative power input terminal vin_gnd to the ground terminal PE, and the discharge paths of the two are substantially equal, thereby improving the stability of the surge protection.
In an implementation, as shown in fig. 4, the first filtering module 104 may include: a second capacitor C2 and a common mode inductance FIL1; the first end of the second capacitor C2 is used as the first end of the first filter module 104 and is connected to the first end of the common-mode inductor FIL1, the second end of the second capacitor C2 is used as the second end of the first filter module 104 and is connected to the second end of the common-mode inductor FIL1, the third end of the common-mode inductor FIL1 is used as the third end of the first filter module 104, and the fourth end of the common-mode inductor FIL1 is used as the fourth end of the first filter module 104.
The second capacitor C2 may be an X capacitor, and may perform differential mode filtering, and the common mode inductor FIL1 may filter common mode noise on the one hand, and may further perform decoupling function, and may perform current limiting on lightning stroke overcurrent.
In particular implementations, as shown in fig. 4, the first residual voltage processing module 105 may include a first bidirectional transient suppression diode D1; the first terminal of the first bidirectional transient suppression diode D1 is used as the first terminal of the first residual voltage processing module 105, and the second terminal of the first bidirectional transient suppression diode D1 is used as the second terminal of the first residual voltage processing module 105.
The first bidirectional transient suppression diode D1 may reduce the residual voltage, but other ways of reducing the residual voltage may be selected, for example, a varistor or a semiconductor discharge tube may be used.
In an implementation, as shown in fig. 5, the method may further include: a second filtering module 106 and a second residual voltage processing module 107; the first end of the second filtering module 106 is connected with the first end of the first residual voltage processing module 105, the second end of the second filtering module 106 is connected with the second end of the first residual voltage processing module 105, the third end of the second filtering module 106 is connected with the first end of the second residual voltage processing module 107, and the fourth end of the second filtering module 106 is connected with the second end of the second residual voltage processing module 107; a second filtering module 106 for reducing electromagnetic radiation; and a second residual pressure processing module 107 for reducing residual pressure again.
Specifically, as shown in fig. 6, the second filtering module 106 may include: the third capacitor C3, the fourth capacitor C4 and the differential mode inductor L1;
the first end of the third capacitor C3 is used as the first end of the second filtering module 106 and is connected with the first end of the differential mode inductor L1, the second end of the third capacitor C3 is used as the second end of the second filtering module 106, the first end of the fourth capacitor C4 is used as the third end of the second filtering module 106 and is connected with the second end of the differential mode inductor L1, and the second end of the fourth capacitor C4 is used as the fourth end of the second filtering module and is connected with the second end of the third capacitor C3;
the third capacitor C3 and the fourth capacitor C4 may be ceramic chip capacitors, and a pi filter circuit is formed by the ceramic chip capacitors and the differential mode inductor L1, so as to optimize EMC radiation and conduction problems.
The second residual voltage handling module 107 may include a second bidirectional transient suppression diode D2;
the first end of the second bidirectional transient suppression diode D2 is used as the first end of the second residual voltage processing module 107, and the second end of the second bidirectional transient suppression diode D2 is used as the second end of the second residual voltage processing module 107, however, other ways of reducing residual voltage may be selected, for example, a varistor or a semiconductor discharge tube may be used.
The power supply surge protection circuit provided by the embodiment of the application can at least meet the high-level surge design requirements of the differential mode 10 KA/common mode 10KA, the differential mode 20 KV/common mode 20KV, has relatively small device volume and is friendly to PCB layout.
In an implementation, as shown in fig. 7, a first fuse F1 and a second fuse F2 may be further included; the first end of the first filter module 104 is connected to the positive power input terminal vin_in through a first fuse F1, and the second end of the first filter module 104 is connected to the negative power input terminal vin_gnd through a second fuse F2. The circuit has the function of fusing the fuse when the circuit fails, such as the short-circuit failure of the rear-stage bidirectional transient suppression diode, cutting off the whole circuit and protecting the circuit.
In order to meet the requirements of 1.2/50us (voltage wave) combined wave differential mode 20 KV/common mode 20KV surge test and 8/20us (current wave) combined wave differential mode 10 KA/common mode 10KA surge test design, the device selection needs to be that the gas discharge tube GDT1 and the piezoresistors RV1 and RV2 are selected to at least meet the capability of 8/20us lightning stroke test waveform 10KA through-flow, the peak pulse power of the bidirectional TVS tube D1 and D2 is at least 5000W, and the PCB routes of the first surge protection module, the second surge protection module and the third surge protection module are at least required to meet the requirement of more than 1OZ line width 200mil (2 OZ line width 100 mil).
In order to meet the power line lap joint requirement and the power supply port AC500V insulation withstand voltage requirement, the combined action voltage of the piezoresistors RV1, RV2 and the gas discharge tubes GDT1 is higher than DC707V, for example, the piezoresistor can select 20D821, and the breakdown voltage of each gas discharge tube GDT1 can be 140V-250V.
It should be noted that the above parameters are given as examples, and the present application is not limited thereto.
Various modifications and alterations of this application may be made by those skilled in the art without departing from the spirit and scope of this application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A power supply surge protection circuit, comprising: the device comprises a first surge protection module, a second surge protection module, a third surge protection module, a first filtering module and a first residual voltage processing module;
the first end of the third surge protection module is connected with the positive power input end and the first end of the second surge protection module respectively, the second end of the third surge protection module is connected with the negative power input end, the third end of the third surge protection module is connected with the second end of the second surge protection module and the first end of the first surge protection module respectively, and the second end of the first surge protection module is connected with the grounding end; the first end of the first filtering module is connected with the positive input end of the power supply, the second end of the first filtering module is connected with the negative input end of the power supply, the third end of the first filtering module is connected with the first end of the first residual voltage processing module, and the fourth end of the first filtering module is connected with the second end of the first residual voltage processing module;
the first surge protection module is used for being matched with the second surge protection module when a common mode surge is generated between the positive input end of the power supply and the grounding end, conducting a passage between the first end of the second surge protection module and the second end of the first surge protection module, and being matched with the third surge protection module when a common mode surge is generated between the negative input end of the power supply and the grounding end, conducting a passage between the second end of the third surge protection module and the second end of the first surge protection module, and discharging common mode surge energy;
the second surge protection module is used for being matched with the third surge protection module when a differential mode surge is generated between the positive power input end and the negative power input end, conducting a passage between the first end of the second surge protection module and the second end of the third surge protection module, discharging differential mode surge energy and generating residual voltage;
the first filtering module is used for filtering noise;
the first residual pressure processing module is used for reducing the residual pressure.
2. The power supply surge protection circuit of claim 1 wherein the second surge protection module comprises a gas discharge tube and a first capacitor connected in parallel, the third surge protection module comprising: m gas discharge tubes and (M-1) first capacitors;
the first end of the gas discharge tube and the first capacitor which are connected in parallel are used as the first end of the second surge protection module, and the second end of the gas discharge tube and the first capacitor which are connected in parallel are used as the second end of the second surge protection module;
the M gas discharge tubes are connected in series between the second end of the second surge protection module and the negative power input end, one end of the gas discharge tube connected with the second end of the second surge protection module is used as the third end of the third surge protection module, one end of the gas discharge tube connected with the negative power input end is used as the second end of the third surge protection module, the first end of the (M-1) first capacitor is used as the first end of the third surge protection module, the second ends of the (M-1) first capacitors are respectively connected with each node, wherein each node is respectively a midpoint of (M-1) of the M gas discharge tubes connected in series, and M is a positive integer greater than or equal to 2.
3. The power supply surge protection circuit of claim 2 wherein the first surge protection module comprises: a first varistor;
the first end of the first piezoresistor is used as the first end of the first surge protection module, and the second end of the first piezoresistor is used as the second end of the first surge protection module.
4. The power supply surge protection circuit of claim 3, further comprising: a second varistor;
the other end of the gas discharge tube connected with the negative input end of the power supply is connected with the first end of the second piezoresistor, and the second end of the second piezoresistor is connected with the grounding end.
5. The power supply surge protection circuit of claim 1 wherein the first filtering module comprises: a second capacitance and a common mode inductance;
the first end of the second capacitor is used as the first end of the first filter module and is connected with the first end of the common-mode inductor, the second end of the second capacitor is used as the second end of the first filter module and is connected with the second end of the common-mode inductor, the third end of the common-mode inductor is used as the third end of the first filter module, and the fourth end of the common-mode inductor is used as the fourth end of the first filter module.
6. The power supply surge protection circuit of claim 1 wherein the first residual voltage processing module comprises a first bidirectional transient suppression diode;
the first end of the first bidirectional transient suppression diode is used as the first end of the first residual voltage processing module, and the second end of the first bidirectional transient suppression diode is used as the second end of the first residual voltage processing module.
7. The power supply surge protection circuit of claim 1, further comprising: the second filtering module and the second residual voltage processing module;
the first end of the second filtering module is connected with the first end of the first residual voltage processing module, the second end of the second filtering module is connected with the second end of the first residual voltage processing module, the third end of the second filtering module is connected with the first end of the second residual voltage processing module, and the fourth end of the second filtering module is connected with the second end of the second residual voltage processing module;
the second filtering module is used for reducing electromagnetic radiation;
and the second residual pressure processing module is used for reducing the residual pressure again.
8. The power supply surge protection circuit of claim 7 wherein the second filtering module comprises: the third capacitor, the fourth capacitor and the differential mode inductor;
the first end of the third capacitor is used as the first end of the second filter module and is connected with the first end of the differential mode inductor, the second end of the third capacitor is used as the second end of the second filter module, the first end of the fourth capacitor is used as the third end of the second filter module and is connected with the second end of the differential mode inductor, and the second end of the fourth capacitor is used as the fourth end of the second filter module and is connected with the second end of the third capacitor.
9. The power supply surge protection circuit of claim 7 wherein the second residual voltage processing module comprises a second bidirectional transient suppression diode;
the first end of the second bidirectional transient suppression diode is used as the first end of the second residual voltage processing module, and the second end of the second bidirectional transient suppression diode is used as the second end of the second residual voltage processing module.
10. The power surge protection circuit of any of claims 1-9, further comprising a first fuse and a second fuse;
the first end of the first filtering module is connected with the positive power input end through the first fuse, and the second end of the first filtering module is connected with the negative power input end through the second fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310513365.3A CN116613978A (en) | 2023-05-06 | 2023-05-06 | Power supply surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310513365.3A CN116613978A (en) | 2023-05-06 | 2023-05-06 | Power supply surge protection circuit |
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| Publication Number | Publication Date |
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| CN116613978A true CN116613978A (en) | 2023-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310513365.3A Pending CN116613978A (en) | 2023-05-06 | 2023-05-06 | Power supply surge protection circuit |
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| Country | Link |
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| CN (1) | CN116613978A (en) |
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2023
- 2023-05-06 CN CN202310513365.3A patent/CN116613978A/en active Pending
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