CN217508585U - Filtering protection circuit, device and system - Google Patents
Filtering protection circuit, device and system Download PDFInfo
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- CN217508585U CN217508585U CN202220350887.7U CN202220350887U CN217508585U CN 217508585 U CN217508585 U CN 217508585U CN 202220350887 U CN202220350887 U CN 202220350887U CN 217508585 U CN217508585 U CN 217508585U
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Abstract
The utility model provides a filtering protection circuit, device and system, this filtering protection circuit includes: the protection circuit comprises a primary protection circuit, a secondary protection circuit and a common-mode filter circuit; when a power supply is coupled to surge voltage, the primary protection circuit primarily releases the surge in the power supply voltage to obtain initial release power supply voltage, and outputs the initial release power supply voltage to the common mode filter circuit; the common-mode filter circuit performs common-mode noise reduction on the primary released power supply voltage to obtain common-mode filtered power supply voltage, and outputs the common-mode filtered power supply voltage to the secondary protection circuit; and the secondary protection circuit releases residual surge in the common-mode filtered power supply voltage again to obtain standard power supply voltage and outputs the standard power supply voltage. The utility model discloses a set up one-level protection circuit and second grade protection circuit and carry out a lot of release to the surge in the mains voltage, the back level residual voltage that can avoid is too high, and is not enough to the back level protection.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a filtering protection circuit, device and system.
Background
At present, a 24V power supply of a PLC generally adopts a high-voltage-withstanding large-package (package 1812) chip capacitor and a common-mode inductor as a main filter device, and the capacitor with high-voltage-withstanding large package is adopted because strong noise above 2kV needs to be injected into a power supply during EMC test, so that the insulation distance of a bonding pad of the device needs to be large enough, and the requirement on the overcurrent resistance of the device is also high.
Referring to fig. 1, pi-type filtering is adopted in the topology of the existing filtering protection, a group of differential mode capacitors and common mode capacitors are arranged at the front and the back of a 1mH common mode inductor, the two groups of common mode capacitors adopt 1000pF high-voltage-withstanding large-package (package 1812) patch capacitors, the two differential mode capacitors also adopt 100V voltage-withstanding patch capacitors of 0.1uF, and furthermore, pressure-sensitive is used as a protection device, and a fuse is used as a rear-stage short-circuit protection device.
The existing filter only has a first-stage voltage dependent resistor as a protection circuit, so that when surge energy is input into a 24V port, the residual voltage of the rear stage of the filter is higher, and the rear stage is not protected sufficiently; the high-voltage-resistance large-package common-mode capacitor is high in price, large in quantity and not economical.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a filter protection circuit, device and system, which aims to solve the technical problems of the prior art that when surge energy is input, the residual voltage at the rear stage of the filter is high and the protection at the rear stage is not sufficient.
In order to achieve the above object, the utility model provides a filtering protection circuit, filtering protection circuit includes: the protection circuit comprises a primary protection circuit, a secondary protection circuit and a common-mode filter circuit;
the first-stage protection circuit is connected with a power supply and the common-mode filter circuit, and the common-mode filter circuit is connected with the second-stage protection circuit;
the primary protection circuit is used for carrying out primary release on the surge in the power supply voltage to obtain initial release power supply voltage when the power supply is coupled to the surge voltage, and outputting the initial release power supply voltage to the common mode filter circuit;
the common-mode filter circuit is used for performing common-mode noise reduction on the primary released power supply voltage to obtain common-mode filtered power supply voltage, and outputting the common-mode filtered power supply voltage to the secondary protection circuit;
and the secondary protection circuit is used for releasing residual surge in the common-mode filtered power supply voltage again to obtain standard power supply voltage and outputting the standard power supply voltage.
Optionally, the filter protection circuit further comprises: a first differential mode filter circuit and a second differential mode filter circuit;
the first differential mode filter circuit is connected with the first-stage protection circuit and the common mode filter circuit, and the second differential mode filter circuit is respectively connected with the common mode filter circuit and the second-stage protection circuit;
the first differential mode filter circuit is used for filtering the power supply voltage and outputting the noise-reduced power supply voltage to the common mode filter circuit;
the second differential mode filter circuit is used for performing differential mode filtering on the common mode noise-reduced power supply voltage to obtain differential mode power supply voltage and outputting the differential mode power supply voltage to the secondary protection circuit;
and the secondary protection circuit is also used for releasing residual surge in the differential mode power supply voltage again to obtain standard power supply voltage and outputting the standard power supply voltage.
Optionally, the primary protection circuit includes: a voltage dependent resistor;
the first end of the piezoresistor is connected with the anode of the power supply and the common-mode filter circuit respectively, and the second end of the piezoresistor is connected with the cathode of the power supply and the second end of the common-mode filter circuit.
Optionally, the common mode filter circuit comprises: first to fourth capacitances and a common mode inductance;
the first end of the first capacitor and the first end of the second capacitor are connected with the positive electrode of the power supply, the second end of the first capacitor and the second end of the second capacitor are grounded, the first end of the third capacitor and the first end of the fourth capacitor are connected with the negative electrode of the power supply, the second end of the third capacitor and the second end of the fourth capacitor are grounded, the first end of the common-mode inductor is connected with the first end of the piezoresistor, the first end of the first capacitor and the first end of the second capacitor, the second end of the common-mode inductor is connected with the secondary protection circuit, the third end of the common-mode inductor is connected with the first end of the third capacitor, the first end of the fourth capacitor and the second end of the piezoresistor, and the fourth end of the common-mode inductor is connected with the secondary protection circuit.
Optionally, the common mode filter circuit further includes: fifth to eighth capacitors;
the first end of a fifth capacitor is connected with the second end of the first capacitor, the first end of a sixth capacitor is connected with the second end of the second capacitor, the second end of the fifth capacitor and the second end of the sixth capacitor are grounded, the first end of a seventh capacitor is connected with the first end of the third capacitor, the first end of an eighth capacitor is connected with the second end of the fourth capacitor, and the second end of the seventh capacitor and the second end of the eighth capacitor are grounded.
Optionally, the secondary protection circuit includes: a transient diode;
the first end of the transient diode is connected with the second end of the common-mode inductor and the second differential-mode filter circuit, the second end of the transient diode is connected with the fourth end of the common-mode inductor and the second differential-mode filter circuit, and the transient diode is connected in parallel with two ends of a load.
Optionally, the first differential-mode filter circuit includes: a ninth capacitor; the second differential mode filter circuit includes: a tenth capacitance;
the first end of the ninth capacitor is connected to the first end of the voltage dependent resistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the common mode inductor, the second end of the ninth capacitor is connected to the first end of the third capacitor, the first end of the fourth capacitor, the second end of the voltage dependent resistor and the third end of the common mode inductor, the first end of the tenth capacitor is connected to the second end of the common mode inductor and the first end of the transient diode, and the second end of the tenth capacitor is connected to the fourth end of the common mode inductor and the second end of the transient diode.
Optionally, the filter protection circuit further includes: a fuse;
the first end of the fuse is connected with the positive electrode of the power supply, and the second end of the fuse is connected with the first end of the piezoresistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the ninth capacitor.
In order to achieve the above object, the utility model discloses still provide a filtering protector, filtering protector includes filtering protection circuit.
In order to achieve the above object, the utility model discloses still provide a filtering protection system, filtering protection system includes filtering protector.
The utility model provides a filtering protection circuit, device and system, this filtering protection circuit includes: the protection circuit comprises a primary protection circuit, a secondary protection circuit and a common-mode filter circuit; when the power supply is coupled to surge voltage, the primary protection circuit performs primary release on surge in the power supply voltage to obtain initial release power supply voltage, and outputs the initial release power supply voltage to the common mode filter circuit; the common-mode filter circuit performs common-mode noise reduction on the primary released power supply voltage to obtain common-mode filtered power supply voltage, and outputs the common-mode filtered power supply voltage to the secondary protection circuit; and the secondary protection circuit releases the residual surge in the common-mode filtered power supply voltage again to obtain a standard power supply voltage and outputs the standard power supply voltage. The utility model discloses a set up one-level protection circuit and second grade protection circuit and carry out a lot of release to the surge in the mains voltage, the back level residual voltage that can avoid is too high, and is not enough to the back level protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a circuit diagram of a prior art filter protection circuit;
fig. 2 is a schematic structural diagram of a first embodiment of a filter protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of a filter protection circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a second embodiment of a filter protection circuit according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) | |
| 10 | First-stage protection circuit | R1 | Voltage |
|
| 20 | Two-pole protection circuit | C1～C10 | First to |
|
| 30 | Common mode filter circuit | L1 | |
|
| 40 | First differential mode filter circuit | | Transient diode | |
| 50 | Second differential mode filter circuit | N | Negative pole of power supply | |
| PE | Ground connection | L | Power supply anode |
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first embodiment of a filter protection circuit according to an embodiment of the present invention. Based on fig. 2, the utility model discloses the first embodiment of filter protection circuit is proposed.
In this embodiment, the filter protection circuit includes: a primary protection circuit 10, a secondary protection circuit 20 and a common mode filter circuit 30;
the first-stage protection circuit 10 is connected to a power supply and the common mode filter circuit 30, and the common mode filter circuit 30 is connected to the second-stage protection circuit 20.
It should be understood that, a filter usually has a voltage dependent resistor as a filter protection circuit, but when surge energy occurs, the voltage dependent resistor cannot completely filter the surge, so that the surge has a high residual voltage at a rear stage of the filter, and the residual voltage can directly damage a rear stage circuit or a load.
The first protection circuit 10 is a circuit for releasing a surge in the power supply voltage. The primary protection circuit 10 may directly employ a varistor or may employ other surge relief components. The secondary protection circuit 20 is a circuit for releasing a residual voltage having a higher voltage value among the power supply voltages released by the primary protection circuit 10. Wherein, the residual voltage with higher voltage value can be the surge which is not completely released in the power supply voltage. The common mode filter circuit 30 is a circuit for performing common mode filtering on the power supply voltage after the initial surge discharge. The common mode filter circuit 30 can filter out common mode noise in the supply voltage.
In a specific implementation, the primary protection circuit 10 may perform an initial release on a surge in the power supply voltage to obtain an initial release power supply voltage when the power supply is coupled to the surge voltage, and output the initial release power supply voltage to the common mode filter circuit 30; the common mode filter circuit 3 may perform common mode noise reduction on the primary released power supply voltage to obtain a common mode filtered power supply voltage, and output the common mode filtered power supply voltage to the secondary protection circuit 20; the secondary protection circuit 20 may release the residual surge in the common-mode filtered power supply voltage again to obtain a standard power supply voltage, and output the standard power supply voltage.
The initial release power supply voltage refers to the power supply voltage obtained after initial surge release. The common-mode filtered power supply voltage refers to the power supply voltage obtained after common-mode filtering. The standard power supply voltage refers to a power supply voltage free from surge and common mode noise. The standard power supply voltage may be directly input to a subsequent circuit or a subsequent load.
In this embodiment, a filter protection circuit is provided, which includes: the protection circuit comprises a primary protection circuit, a secondary protection circuit and a common-mode filter circuit; when the power supply is coupled to surge voltage, the primary protection circuit primarily releases the surge in the power supply voltage to obtain initial release power supply voltage, and outputs the initial release power supply voltage to the common mode filter circuit; the common-mode filter circuit performs common-mode noise reduction on the primary release power supply voltage to obtain a common-mode filtered power supply voltage, and outputs the common-mode filtered power supply voltage to the secondary protection circuit; and the secondary protection circuit releases the residual surge in the common-mode filtered power supply voltage again to obtain a standard power supply voltage and outputs the standard power supply voltage. In this embodiment, the surge in the power supply voltage is released for many times by setting the primary protection circuit and the secondary protection circuit, so that the secondary residual voltage which can be avoided is too high, and the secondary protection is insufficient.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the filter protection circuit according to the embodiment of the present invention. Based on above-mentioned first embodiment, provide the utility model discloses filtering protection circuit's second embodiment.
The filter protection circuit further comprises: a first differential-mode filter circuit 40 and a second differential-mode filter circuit 50;
the first differential mode filter circuit 40 is connected to the first-stage protection circuit 10 and the common mode filter circuit 30, and the second differential mode filter circuit 50 is connected to the common mode filter circuit 30 and the second-stage protection circuit 20, respectively.
It will be appreciated that not only common mode noise but also differential mode noise needs to be filtered out in the filter. Common mode noise can be filtered by the common mode filter circuit 30, while differential mode noise requires filtering.
It should be noted that the differential mode filter circuit may be a filter element disposed between the power line and the bottom line, and may be configured to filter differential mode noise in the power supply voltage.
In a specific implementation, the first differential-mode filter circuit 40 may perform first differential-mode filtering noise reduction on the power voltage, and output the power voltage obtained after the first differential-mode filtering noise reduction to the common-mode filter circuit 30, the common-mode filter circuit 30 may be directly connected to the second differential-mode filter circuit 50, and output the power voltage after common-mode filtering after performing common-mode filtering on the initial release power voltage subjected to initial surge release to the second differential-mode filter circuit 50, and the second differential-mode filter circuit 50 may perform differential-mode filtering again on the common-mode filtered power voltage, filter differential-out differential-mode noise in the power voltage, obtain differential-mode power voltage, and output the differential-mode power voltage to the secondary protection circuit 20; the secondary protection circuit 20 releases the residual surge in the differential mode power supply voltage again to obtain a standard power supply voltage, and outputs the standard power supply voltage.
In this embodiment, the primary protection circuit 10 includes: a varistor R1;
a first end of the voltage dependent resistor R1 is connected to the positive electrode L of the power supply and a first end of the common mode filter circuit 20, respectively, and a second end of the voltage dependent resistor R1 is connected to the negative electrode N of the power supply and a second end of the common mode filter circuit 20.
It should be noted that the resistance of the varistor R1 is related to the voltage across the varistor R1. When the voltage at the two ends of the piezoresistor R is lower than the threshold voltage of the piezoresistor R1, the piezoresistor is in a high-resistance state at the moment, and only a small part of current flows through the piezoresistor R1; however, when the voltage across the varistor R1 is greater than the threshold voltage, the resistance of the varistor R1 is very small, and a large amount of current can flow through the varistor R1.
It should be understood that, in the present embodiment, when the power supply voltage is a normal power supply voltage in which there is no surge, the resistance of the voltage dependent resistor R1 is large, and the power supply voltage can directly flow into the common mode filter circuit 30. When the power supply voltage is the power supply voltage with surge, when the surge passes through the piezoresistor R1, the voltage value at two ends of the piezoresistor R1 is very large, and at the moment, the large current generated by the surge can directly flow to the cathode N of the power supply through the piezoresistor R1, so that the surge is released for a plurality of times.
In this embodiment, the common mode filter circuit 30 includes: first to fourth capacitances and a common mode inductance; the common mode inductor comprises a first inductor L1 and a second inductor L2;
wherein a first terminal of the first capacitor C1 and a first terminal of the second capacitor C2 are connected with the positive electrode L of the power supply, the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are grounded PE, the first terminal of the third capacitor C1 and the first terminal of the fourth capacitor C4 are connected to the negative N of the power supply, the second terminal of the third capacitor C3 and the second terminal of the fourth capacitor C4 are grounded PE, the first end of the common mode inductor L1 is connected with the first end of the voltage dependent resistor R1, the first end of the first capacitor C1 and the first end of the second capacitor C2, the second end of the common mode inductor L1 is connected to the secondary protection circuit 20, the third end of the common mode inductor L1 is connected to the first end of the third capacitor C3, the first end of the fourth capacitor C4 and the second end of the voltage dependent resistor R1, and the fourth end of the common mode inductor L1 is connected to the secondary protection circuit 20.
It should be understood that in fig. 1, two sets of high voltage large packaged patch capacitors are typically used in the prior art common mode filter circuit, and the cost of the patch capacitors is high, such as the patch capacitors of the package 1812. In the scheme, a high-voltage-withstanding large-package capacitor, such as a capacitor of the package 1206, can be replaced by a high-voltage-withstanding small-package capacitor through an optimized topology.
It should be noted that, both the allowed current and voltage of the high-voltage small package capacitor cannot reach the allowed current or voltage of the high-voltage large package patch capacitor. When the current is large, the allowed current value can be increased by adopting two high-voltage-resistance small packaging capacitors in a parallel shunting manner.
It can be understood that, in the present embodiment, the large capacitors first to second capacitors in fig. 1 of the prior art are replaced by the first to eighth capacitors of fig. 4. For the initial release voltage with larger current, the first capacitor C1 and the second capacitor C2 of the small package are connected in parallel, and the third capacitor C1 and the fourth capacitor C4 of the small package are connected in parallel. And in common-mode filtering, the initial release voltage is subjected to common-mode filtering through the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the common-mode inductor to obtain a common-mode filtered power supply voltage.
In this embodiment, the common mode filter circuit further includes: fifth to eighth capacitors;
a first end of a fifth capacitor C5 is connected to the second end of the first capacitor C1, a first end of a sixth capacitor C6 is connected to the second end of the second capacitor C2, the second end of the fifth capacitor C5 and the second end of the sixth capacitor C6 are grounded PE, a first end of a seventh capacitor C7 is connected to the first end of the third capacitor C3, the first end of the eighth capacitor C8 is connected to the second end of the fourth capacitor C4, and the second ends of the seventh capacitor C7 and the eighth capacitor C8 are grounded PE.
It should be understood that the voltage value allowed to pass by the two capacitors of the small package in parallel is only the voltage value of one capacitor of the small package, and the common mode filtering process of the initial release voltage with larger voltage cannot be solved. Therefore, in this embodiment, the fifth to eighth capacitors are further provided, and the voltage value for performing the common mode filtering process is increased by connecting the first capacitor C1 and the fifth capacitor C5 in series. The second capacitor C2 is connected in series with the sixth capacitor C6, the third capacitor C3 is connected in series with the seventh capacitor C7, and the fourth capacitor C4 is connected in series with the eighth capacitor C8. In addition, through a mode of connecting the double capacitors in series, ignition and discharge between two bonding pads of a 1206 package (small package) with high-intensity noise can be effectively prevented.
In this embodiment, the secondary protection circuit 20 includes: a transient diode TVS;
the first end of the transient diode TVS is connected to the second end of the common mode inductor L1 and the second differential mode filter circuit 50, the second end of the transient diode TVS is connected to the fourth end of the common mode inductor and the second differential mode filter circuit 50, and the transient diode TVS is connected in parallel to two ends of the load.
It should be noted that the transient diode TVS is a high performance protection device. When two poles of the transient diode TVS are impacted by reverse transient high energy, the transient diode TVS can change the high impedance between the two poles into low impedance at the speed of 10 minus 12 times of a second, absorb the surge power of thousands of watts and clamp the voltage between the two poles at a preset value, thereby effectively protecting precise components in an electronic circuit from being damaged by various surge pulses.
It should be understood that when the voltage across the transient diode TVS is at the normal power voltage, the transient diode TVS is in a high impedance state and does not discharge the normal power voltage.
In a specific implementation, the differential mode power voltage obtained through the common mode filtering and the differential mode filtering passes through the first terminal of the transient diode TVS. When the differential mode power voltage does not include a residual voltage with a higher voltage value, the voltage at the two ends of the transient diode TVS does not conduct the transient diode TVS, and the differential mode power voltage can be directly output to the rear stage. When the differential mode power voltage includes a residual voltage with a higher voltage value, the residual voltage is directly applied to two ends of the transient diode TVS to conduct the transient diode TVS, so as to release the residual voltage with the higher voltage value.
It should be noted here that, since the response speed of the transient diode TVS is greater than the response speed of the voltage dependent resistor R1, in order to avoid that the transient diode TVS responds first and the voltage value input to the two ends of the transient diode TVS through the common-mode inductor is reduced, the voltage dependent resistor R1 releases the surge first, and then the transient diode TVS releases the residual voltage with a higher voltage value.
In this embodiment, the first differential-mode filter circuit 40 includes: a ninth capacitance C9; the second differential-mode filter circuit 50 includes: a tenth capacitance C10;
wherein, a first end of the ninth capacitor C9 is connected to the first end of the varistor R1, the first end of the first capacitor C1, the first end of the second capacitor C2 and the first end of the common mode inductor L1, a second end of the ninth capacitor C9 is connected to the first end of the third capacitor C3, the first end of the fourth capacitor C4, the second end of the varistor R1 and the first end of the second inductor L1, a first end of the tenth capacitor C10 is connected to the second end of the common mode inductor L1 and the first end of the transient diode TVS, and a second end of the tenth capacitor C10 is connected to the fourth end of the common mode inductor L1 and the second end of the transient diode TVS.
It should be understood that the ninth capacitor C9 is connected to one end of the common mode inductor, and the tenth capacitor C10 is disposed at the other end of the common mode inductor. The ninth capacitor C9 may filter the supply voltage in differential mode directly, and the tenth capacitor C10 may filter the supply voltage obtained after common mode filtering.
In the present embodiment, the differential mode filtering is performed directly by providing a capacitor between the positive electrode L and the negative electrode N of the power supply voltage. The ninth capacitor C9 and the tenth capacitor C10 can effectively filter out the differential mode noise in the power supply voltage.
In this embodiment, the filter protection circuit further includes: a fuse F1;
a first end of the fuse F1 is connected to the positive electrode L of the power supply, and a second end of the fuse F1 is connected to the first end of the varistor R1, the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the ninth capacitor C9.
It should be understood that, in order to prevent the direct short circuit of the subsequent circuit or the subsequent load, when the fuse F1 is set to be short-circuited at the subsequent stage, the high current output by the power supply voltage can directly blow the fuse F1 to protect the subsequent circuit or the subsequent load.
In this embodiment, a filter protection circuit is provided, which includes: the protection circuit comprises a primary protection circuit, a secondary protection circuit and a common-mode filter circuit; when the power supply is coupled to surge voltage, the primary protection circuit performs primary release on surge in the power supply voltage to obtain initial release power supply voltage, and outputs the initial release power supply voltage to the common mode filter circuit; the common-mode filter circuit performs common-mode noise reduction on the primary released power supply voltage to obtain common-mode filtered power supply voltage, and outputs the common-mode filtered power supply voltage to the secondary protection circuit; and the secondary protection circuit releases the residual surge in the common-mode filtered power supply voltage again to obtain a standard power supply voltage and outputs the standard power supply voltage. In this embodiment, the piezoresistor and the transient diode are respectively arranged at the two ends of the common mode inductor, so that multiple times of high-response release is performed on surge in the power voltage, and residual voltage can be directly released when residual voltage with a higher voltage value occurs, so that a circuit or a load connected at the later stage is protected more accurately.
In order to achieve the above object, the utility model discloses still provide a filtering protector, filtering protector includes as above-mentioned filtering protection circuit. The specific structure of the filter protection circuit refers to the above embodiments, and since the filter protection device adopts all technical solutions of all the above embodiments, all beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated herein.
In order to achieve the above object, the utility model discloses still provide a filtering protection system, filtering protection system includes as above-mentioned filtering protector. The specific structure of the filtering protection device refers to the above embodiments, and since the filtering protection system adopts all technical solutions of all the above embodiments, all beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated herein.
The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the same way in the patent protection scope of the present invention.
Claims (10)
1. A filter protection circuit, wherein the filter protection circuit comprises: the protection circuit comprises a primary protection circuit, a secondary protection circuit and a common-mode filter circuit;
the first-stage protection circuit is connected with a power supply and the common-mode filter circuit, and the common-mode filter circuit is connected with the second-stage protection circuit;
the primary protection circuit is used for primarily releasing the surge in the power supply voltage to obtain an initial release power supply voltage when the power supply is coupled to the surge voltage, and outputting the initial release power supply voltage to the common mode filter circuit;
the common-mode filter circuit is used for performing common-mode noise reduction on the primary released power supply voltage to obtain common-mode filtered power supply voltage, and outputting the common-mode filtered power supply voltage to the secondary protection circuit;
and the secondary protection circuit is used for releasing residual surge in the common-mode filtered power supply voltage again to obtain standard power supply voltage and outputting the standard power supply voltage.
2. The filter protection circuit of claim 1, wherein the filter protection circuit further comprises: a first differential mode filter circuit and a second differential mode filter circuit;
the first differential mode filter circuit is connected with the first-stage protection circuit and the common mode filter circuit, and the second differential mode filter circuit is respectively connected with the common mode filter circuit and the second-stage protection circuit;
the first differential mode filter circuit is used for filtering the power supply voltage and outputting the noise-reduced power supply voltage to the common mode filter circuit for common mode noise reduction;
the second differential mode filter circuit is used for performing differential mode filtering on the common mode noise-reduced power supply voltage to obtain differential mode power supply voltage and outputting the differential mode power supply voltage to the secondary protection circuit;
and the secondary protection circuit is also used for releasing residual surge in the differential mode power supply voltage again to obtain standard power supply voltage and outputting the standard power supply voltage.
3. The filter protection circuit of claim 2, wherein the primary protection circuit comprises: a voltage dependent resistor;
the first end of the piezoresistor is connected with the anode of the power supply and the first end of the common-mode filter circuit respectively, and the second end of the piezoresistor is connected with the cathode of the power supply and the second end of the common-mode filter circuit.
4. The filter protection circuit of claim 3, wherein the common mode filter circuit comprises: first to fourth capacitances and a common mode inductance;
the first end of the first capacitor and the first end of the second capacitor are connected with the positive electrode of the power supply, the second end of the first capacitor and the second end of the second capacitor are grounded, the first end of the third capacitor and the first end of the fourth capacitor are connected with the negative electrode of the power supply, the second end of the third capacitor and the second end of the fourth capacitor are grounded, the first end of the common-mode inductor is connected with the first end of the piezoresistor, the first end of the first capacitor and the first end of the second capacitor, the second end of the common-mode inductor is connected with the secondary protection circuit, the third end of the common-mode inductor is connected with the first end of the third capacitor, the first end of the fourth capacitor and the second end of the piezoresistor, and the fourth end of the common-mode inductor is connected with the secondary protection circuit.
5. The filter protection circuit of claim 4, wherein the common mode filter circuit further comprises: fifth to eighth capacitors;
the first end of a fifth capacitor is connected with the second end of the first capacitor, the first end of a sixth capacitor is connected with the second end of the second capacitor, the second end of the fifth capacitor and the second end of the obtained sixth capacitor are grounded, the first end of a seventh capacitor is connected with the first end of the third capacitor, the first end of an eighth capacitor is connected with the second end of the fourth capacitor, and the second end of the seventh capacitor and the second end of the eighth capacitor are grounded.
6. The filter protection circuit of claim 4, wherein the secondary protection circuit comprises: a transient diode;
the first end of the transient diode is connected with the second end of the common-mode inductor and the second differential-mode filter circuit, the second end of the transient diode is connected with the fourth end of the common-mode inductor and the second differential-mode filter circuit, and the transient diode is connected in parallel with two ends of a load.
7. The filter protection circuit of claim 6, wherein the first differential mode filter circuit comprises: a ninth capacitor; the second differential mode filter circuit includes: a tenth capacitance;
the first end of the ninth capacitor is connected to the first end of the voltage dependent resistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the common mode inductor, the second end of the ninth capacitor is connected to the first end of the third capacitor, the first end of the fourth capacitor, the second end of the voltage dependent resistor and the third end of the common mode inductor, the first end of the tenth capacitor is connected to the second end of the common mode inductor and the first end of the transient diode, and the second end of the tenth capacitor is connected to the fourth end of the common mode inductor and the second end of the transient diode.
8. The filter protection circuit of claim 7, wherein the filter protection circuit further comprises: a fuse;
the first end of the fuse is connected with the positive electrode of the power supply, and the second end of the fuse is connected with the first end of the piezoresistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the ninth capacitor.
9. A filter guard, characterized in that the filter guard comprises a filter guard circuit according to any of claims 1-8.
10. A filter protection system, characterized in that it comprises a filter protection device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350887.7U CN217508585U (en) | 2022-02-21 | 2022-02-21 | Filtering protection circuit, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350887.7U CN217508585U (en) | 2022-02-21 | 2022-02-21 | Filtering protection circuit, device and system |
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| Publication Number | Publication Date |
|---|---|
| CN217508585U true CN217508585U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220350887.7U Active CN217508585U (en) | 2022-02-21 | 2022-02-21 | Filtering protection circuit, device and system |
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| Country | Link |
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| CN (1) | CN217508585U (en) |
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2022
- 2022-02-21 CN CN202220350887.7U patent/CN217508585U/en active Active
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