CN217824272U - Filter protection circuit and equipment - Google Patents
Filter protection circuit and equipment Download PDFInfo
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- CN217824272U CN217824272U CN202221097459.4U CN202221097459U CN217824272U CN 217824272 U CN217824272 U CN 217824272U CN 202221097459 U CN202221097459 U CN 202221097459U CN 217824272 U CN217824272 U CN 217824272U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to the technical field of, in particular to filter protection circuit and equipment. The utility model provides a filter protection circuit, which comprises an active filter module and a passive filter module connected with a three-phase alternating current circuit; the passive filtering module comprises a first passive filtering circuit and a second passive filtering circuit, wherein one of the first passive filtering circuit and the second passive filtering circuit is an RC filter, and the other one of the first passive filtering circuit and the second passive filtering circuit is an LC filter; the active filter module comprises a load sampling circuit, an active filter circuit and a control circuit, wherein the active filter circuit comprises a switch circuit, the load sampling circuit detects load alternating current state information of the output end of the three-phase alternating current circuit and sends the load alternating current state information to the control circuit, and the control circuit controls the working mode of the switch circuit according to the load alternating current state information in a preset control mode so as to filter the three-phase alternating current circuit. The utility model provides a filter protection circuit and equipment compensation precision is high, the response is quick and stable.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a power electronic equipment technical field, its in particular to filter protection circuit and equipment.
[ background ] A method for producing a semiconductor device
With the development of power systems and power electronic devices, more and more nonlinear devices are incorporated into the power grid, so the harmonic injection amount in the power grid is extremely large. The filter is used for reducing the influence of harmonic waves on a power grid and other electric equipment, but the existing filter has the problem of low compensation precision.
[ Utility model ] content
For solving the technical problem that current wave filter compensation precision is low, the utility model provides a filtering protection circuit and equipment.
The utility model provides a solution to the technical problem to provide a filter protection circuit for three-phase alternating current circuit, the filter protection circuit includes active filter module and passive filter module connected to three-phase alternating current circuit; the passive filter module comprises a first passive filter circuit and a second passive filter circuit, wherein one of the first passive filter circuit and the second passive filter circuit is an RC filter, and the other one of the first passive filter circuit and the second passive filter circuit is an LC filter; the active filter module comprises a load sampling circuit, an active filter circuit and a control circuit, the active filter circuit comprises a switch circuit, the load sampling circuit detects load alternating current state information of an output end of the three-phase alternating current circuit and sends the load alternating current state information to the control circuit, and the control circuit controls a working mode of the switch circuit according to the load alternating current state information in a preset control mode so as to filter the three-phase alternating current circuit.
Preferably, the number of the first passive filter circuits is three, and the first passive filter circuits are connected in parallel with each phase circuit of the three-phase alternating-current circuit in a one-to-one correspondence manner; the first passive filter circuit comprises a first filter resistor and a first filter capacitor which are connected in series.
Preferably, the number of the second passive filter circuits is three, and the second passive filter circuits are respectively connected with each phase circuit of the three-phase alternating-current circuit in a one-to-one correspondence manner; each second passive filter circuit comprises a filter inductor and a second filter capacitor, the filter inductor is connected in the three-phase alternating current circuit in series, the first end of the filter inductor is connected with the first passive filter circuit, the second end of the filter inductor is connected with the second filter capacitor, the first end of the second filter capacitor is connected with each phase circuit of the three-phase alternating current circuit in a one-to-one correspondence mode, and the second ends of the second filter capacitors are connected with each other.
Preferably, each of the second passive filter circuits further includes a third filter capacitor, a first end of the third filter capacitor is connected to the second end of the filter inductor, and a second end of the third filter capacitor is grounded.
Preferably, the active filter circuit further includes a feedback sampling circuit, the feedback sampling circuit detects compensation alternating current state information of an output end of the active filter circuit and sends the compensation alternating current state information to the control circuit, and the control circuit controls the switch circuit according to the compensation alternating current state information and the load alternating current state information.
Preferably, the number of the active filter circuits is three, the first end of each active filter circuit is connected with each phase circuit of the three-phase alternating current circuit in a one-to-one correspondence manner, and the second end of each active filter circuit is connected with a zero line.
Preferably, the active filter circuit further comprises a compensation circuit connected in series with the switch circuit, and the compensation circuit comprises a first compensation branch, a second compensation branch and a third compensation branch which are connected in parallel; the first compensation branch comprises a first compensation capacitor, the second compensation branch comprises a second compensation capacitor and a second compensation resistor which are connected in parallel, and the third compensation branch comprises a third compensation capacitor and a third compensation resistor which are connected in parallel.
Preferably, the active filter circuit further includes a first reactor, a second reactor, a pre-charge circuit and a protection circuit connected in series; the first end of the first reactor is connected with a zero line, the second end of the first reactor is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the first end of each compensation branch, the second end of each compensation branch is connected with the first end of the protection circuit, the second end of the protection circuit is connected with the first end of the pre-charging circuit, the second end of the pre-charging circuit is connected with the first end of the second reactor, and the second end of the second reactor is connected with one of the three-phase alternating-current circuits.
Preferably, the switch circuit is a MOS transistor full bridge rectifier circuit.
Another solution to the technical problem of the present invention is to provide a filter protection device for a three-phase ac circuit, wherein the filter protection device includes a main body and a circuit component disposed on the main body, and the circuit component is the filter protection circuit according to any one of claims 1 to 9.
Compared with the prior art, the utility model provides a pair of filtering protection circuit and equipment has following advantage:
1. the embodiment of the utility model provides a filter protection circuit through the design that passive filter module and active filter module combine for higher stability and maintainability can be guaranteed to filter protection circuit, higher response speed and compensation precision can be guaranteed again. The start and stop of large-scale nonlinear equipment in the three-phase alternating current circuit easily generates large impact on a power transmission network to generate overhigh harmonic, and the passive filtering module can effectively and stably perform reactive compensation to improve the stability of the power transmission network, so that the power loss is reduced. In addition, one of the first passive filter circuit and the second passive filter circuit is an RC filter, and the other one is an LC filter, so that the passive filter module has a better filtering effect on low-frequency harmonic waves and high-frequency harmonic waves, and the stable effect of the filter protection circuit on the three-phase alternating current circuit can be further ensured. In addition, to three-phase alternating current circuit's fluctuation, active filter module can detect through load sampling circuit fast to control circuit can change fluctuation control switching power supply ground mode in time, and then carry out accurate reactive compensation to the transmission network through active filter circuit, thereby further improve filter protection circuit to three-phase alternating current circuit's stable effect.
2. The embodiment of the utility model provides a filter protection circuit, first passive filter circuit are for connecting in parallel in three-phase alternating current circuit's RC wave filter to the better low frequency performance of filter protection circuit has been guaranteed.
3. The embodiment of the utility model provides a filter protection circuit, second passive filter circuit are including establishing ties in three-phase alternating current circuit's filter inductance and cross over the second filter capacitance design between double-phase circuit for filter protection circuit's high frequency performance is better, thereby has further improved filter protection circuit to the filter effect of high frequency harmonic. In addition, the third filter capacitor is designed to provide a path for the high-frequency harmonic, so that the high-frequency harmonic can be conducted to the ground through the third filter capacitor, the influence on a load or other elements in a circuit is avoided, and the protection performance and the stability effect of the filter protection circuit are further improved.
4. The embodiment of the utility model provides a filter protection circuit detects compensation alternating current state information and transmits to control circuit's design through feedback sampling circuit for control circuit can in time detect active filter circuit's actual compensation parameter, and control circuit can combine compensation alternating current state information and load alternating current state information in time to control switch circuit's mode of operation to reach anticipated stability in order to guarantee load alternating current state information, thereby further improved active filter circuit's accuracy nature, validity and corresponding speed.
5. The embodiment of the utility model provides a filter protection circuit, active filter circuit include the design of a plurality of parallel connection's compensation branch road, have improved active filter circuit's filter effect and reactive compensation's accuracy greatly, have also further improved filter protection circuit's reactive compensation and active compensation performance.
6. The embodiment of the utility model provides a filter protection circuit through first reactor, second reactor and compensating circuit's cooperation for active power compensation and reactive compensation can be carried out to three-phase alternating current circuit to active filter module, thereby with the harmonic neutralization of three-phase alternating current circuit, and then guarantee the stability of three-phase alternating current circuit. The pre-charging circuit and the protection circuit play a role in protecting the compensation circuit and the switching circuit, and can effectively reduce adverse effects of high-frequency harmonic waves on elements in the switching circuit and the compensation circuit, so that the service life and the safety of the switching circuit and the compensation circuit are improved, and the service life and the safety of the filter protection circuit are further improved.
7. The embodiment of the utility model provides a filter protection circuit is MOS pipe full bridge rectifier circuit's design through switch circuit, can effectively improve active filter circuit's filtering channel width to further guaranteed active filter circuit to the filtering capability of higher harmonic and multiple harmonic, also further improved filter protection circuit's filtering capability.
8. The embodiment of the utility model provides a pair of filtering protection equipment has the same beneficial effect with above-mentioned a filtering protection circuit, no longer gives unnecessary details here.
[ description of the drawings ]
Fig. 1 is a block diagram of a circuit structure of a filter protection circuit according to a first embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a passive filter module of a filter protection circuit according to a first embodiment of the present invention.
Fig. 3 is a block diagram of a circuit structure of an active filter module of a filter protection circuit according to a first embodiment of the present invention.
Fig. 4 is a block diagram of a circuit structure of an active filter circuit of a filter protection circuit according to a first embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of an active filter circuit of a filter protection circuit according to a first embodiment of the present invention.
The attached drawings indicate the following:
1. a filter protection circuit; 2. a filter protection device;
11. a passive filtering module; 12. an active filtering module;
111. a first passive filter circuit; 112. a second passive filter circuit; 121. a load sampling circuit; 122. an active filter circuit; 123. a control circuit; 124. an interaction module; 125. a signal lamp; 126. a detection circuit; 127. a feedback sampling circuit;
1221. a compensation circuit; 1222. a precharge circuit; 1223. a protection circuit; 1224. a switching circuit;
12211. a first compensation branch; 12212. a second compensation branch; 12213. and a third compensation branch.
[ detailed description ] A
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a first embodiment of the present invention provides a filter protection circuit 1 for a three-phase ac circuit, where the filter protection circuit 1 includes an active filter module 12 and a passive filter module 11 connected to the three-phase ac circuit.
Understandably, by the design of combining the passive filter module 11 and the active filter module 12, the filter protection circuit 1 can ensure high stability and maintainability, and can also ensure high response speed and compensation precision. The start and stop of large-scale nonlinear equipment in the three-phase alternating current circuit easily generates large impact on the power transmission network so as to generate overhigh harmonic, and the passive filter module 11 can effectively and stably perform reactive compensation to improve the stability of the power transmission network, so that the power loss is reduced.
Further, the passive filter module 11 includes a first passive filter circuit 111 and a second passive filter circuit 112, one of the first passive filter circuit 111 and the second passive filter circuit 112 is an RC filter, and the other is an LC filter.
It can be understood that one of the first passive filter circuit 111 and the second passive filter circuit 112 is an RC filter and the other is an LC filter, so that the passive filter module 11 has a better filtering effect on both low-frequency harmonics and high-frequency harmonics, thereby further ensuring the stabilizing effect of the filter protection circuit 1 on the three-phase ac circuit.
Further, the first passive filter circuits 111 are RC filters and the number is three, and the first passive filter circuits 111 are connected in parallel with each phase circuit of the three-phase ac circuit in a one-to-one correspondence manner. The first passive filter circuit 111 includes a first filter resistor R1 and a first filter capacitor C1 connected in series.
It can be understood that the first passive filter circuit 111 is an RC filter connected in parallel to the three-phase ac circuit, thereby ensuring better low-frequency performance of the filter protection circuit 1.
Further, the number of the second passive filter circuits 112 is three and the second passive filter circuits are respectively connected to each phase circuit of the three-phase alternating current circuit in a one-to-one correspondence manner. Each second passive filter circuit 112 includes a filter inductor L1 and a second filter capacitor C2, the filter inductor L1 is connected in series in the three-phase ac circuit, a first end of the filter inductor L1 is connected to the first passive filter circuit 111, a second end of the filter inductor L1 is connected to the second filter capacitor C2, a first end of each second filter capacitor C2 is connected to each phase circuit of the three-phase ac circuit in a one-to-one correspondence manner, and second ends of the three second filter capacitors C2 are connected to each other.
It can be understood that the second passive filter circuit 112 includes a filter inductor L1 connected in series to the three-phase ac circuit and a second filter capacitor C2 connected across the two-phase circuit, so that the high-frequency performance of the filter protection circuit 1 is better, and the filtering effect of the filter protection circuit 1 on the high-frequency harmonic is further improved.
Furthermore, each second passive filter circuit 112 further includes a third filter capacitor C3, a first end of the third filter capacitor C3 is connected to the second end of the filter inductor L1, and a second end of the third filter capacitor C3 is grounded.
Understandably, the third filter capacitor C3 is designed to provide a path for the high-frequency harmonics, so that the high-frequency harmonics can be conducted to the ground through the third filter capacitor C3, thereby avoiding the influence on the load or other elements in the circuit, and further improving the protection performance and the stabilization effect of the filter protection circuit 1.
Further, the active filter module 12 includes a load sampling circuit 121, an active filter circuit 122 and a control circuit 123, the active filter circuit 122 includes a switch circuit 1224, the load sampling circuit 121 detects load ac status information of an output end of the three-phase ac circuit and sends the load ac status information to the control circuit 123, and the control circuit 123 controls a working mode of the switch circuit 1224 according to the load ac status information in a preset control manner to filter the three-phase ac circuit.
It can be understood that, for the fluctuation of the three-phase ac circuit, the active filter module 12 can rapidly detect through the load sampling circuit 121, so that the control circuit 123 can control the operation mode of the switching power supply in time for the change of the fluctuation, and then perform accurate reactive compensation on the power transmission network through the active filter circuit 122, thereby further improving the stabilizing effect of the filter protection circuit 1 on the three-phase ac circuit.
Further, the active filtering module 12 further includes an interaction module 124 for displaying content and/or receiving control signals, and the control circuit 123 is in signal connection with the interaction module 124. Specifically, in the embodiment of the present invention, the control circuit 123 controls the active filter circuit 122 to be connected or disconnected according to the control signal received by the interaction module 124, and the control circuit 123 further controls the interaction module 124 to display the corresponding content information.
Understandably, the design of the interaction module 124 improves the visibility and the control convenience of the filter protection circuit 1, and a user can intuitively know the working condition, the working parameters, the parameters of the three-phase alternating current circuit and the like of each module of the filter protection circuit 1 according to the display content of the interaction module 124. In addition, the user can also control the active filter circuit 122 through the interaction module 124, which improves the practicability and convenience of the filter protection circuit 1.
Optionally, the interaction module 124 is a display screen with touch function or a combination of the display screen and the keys. Specifically, in the embodiment of the present invention, the interaction module 124 is a display screen with a touch function.
Further, the interactive module 124 further includes signal lamps 125 in signal connection with the control circuit 123, and the control circuit 123 controls one or more combinations of on/off, color or brightness of the corresponding signal lamps 125 according to the operating state of the active filter circuit 122.
Further, the active filter circuit 122 further includes a main circuit breaker CB1 in signal connection with the control circuit 123, and the control circuit 123 controls connection and disconnection of the corresponding active filter circuit 122 by controlling switching of the main circuit breaker CB 1.
Further, the active filter circuit 122 further includes a circuit breaker switch K1 in signal connection with the main circuit breaker CB1, and the control circuit 123 is connected with the main circuit breaker CB1 through the circuit breaker switch K1 and controls connection and disconnection of the main circuit breaker CB 1.
Further, the active filter module 12 further includes a detection circuit 126, the detection circuit 126 detects a working state of the active filter circuit 122 and sends the working state to the control circuit 123, and the control circuit 123 controls the display screen to display a switching condition of the active filter circuit 122 according to the working state of the active filter circuit 122.
Further, the active filter module 12 further includes a feedback sampling circuit 127, the feedback sampling circuit 127 detects the compensation ac state information at the output end of the active filter circuit 122 and sends the compensation ac state information to the control circuit 123, and the control circuit 123 controls the switch circuit 1224 according to the compensation ac state information and the load ac state information.
It can be understood that, through the design that the feedback sampling circuit 127 detects the compensation ac status information at the output terminal of the active filter circuit 122 and transmits the compensation ac status information to the control circuit 123, the control circuit 123 can detect the actual compensation parameter of the active filter circuit 122 in time, and the control circuit 123 can combine the compensation ac status information and the load ac status information to control the working mode of the switch circuit 1224 in time to ensure that the load ac status information reaches the expected stability, thereby further improving the accuracy, effectiveness and corresponding speed of the active filter circuit 122.
Further, the number of the active filter circuits 122 is three, the first end of each active filter circuit 122 is connected to each phase circuit of the three-phase ac circuit in a one-to-one correspondence manner, and the second end of each active filter circuit 122 is connected to the neutral line N.
Further, the active filter circuit 122 further includes a compensation circuit 1221 connected in series with the switch circuit 1224, and the compensation circuit 1221 includes a first compensation branch 12211, a second compensation branch 12212, and a third compensation branch 12213 connected in parallel.
Further, the first compensation branch 12211 includes a first compensation capacitor C4, the second compensation branch 12212 includes a second compensation capacitor C5 and a second compensation resistor R2 connected in parallel, and the third compensation branch 12213 includes a third compensation capacitor C6 and a third compensation resistor R3 connected in parallel.
It can be understood that, the design that the active filter circuit 122 includes a plurality of compensation branches connected in parallel greatly improves the filtering effect and the accuracy of reactive compensation of the active filter circuit 122, that is, further improves the reactive compensation and the active compensation performance of the filter protection circuit 1.
Furthermore, the second compensation capacitor C5 and the third compensation capacitor C6 are both active capacitors.
Further, the active filter circuit 122 further includes a first reactor L4, a second reactor L5, a precharge circuit 1222, and a protection circuit 1223 connected in series. A first end of the first reactor L4 is connected to the neutral line N, a second end of the first reactor L4 is connected to an input end of the switch circuit 1224, an output end of the switch circuit 1224 is connected to a first end of each compensation branch, second ends of the compensation branches are connected to a first end of the protection circuit 1223, a second end of the protection circuit 1223 is connected to a first end of the precharge circuit 1222, a second end of the precharge circuit 1222 is connected to a first end of the second reactor L5, and a second end of the second reactor L5 is connected to one of the three-phase ac circuits.
It can be understood that, through cooperation of first reactor L4, second reactor L5 and compensation circuit 1221, active filter module 12 is enabled to perform active compensation and reactive compensation on the three-phase ac circuit, so as to neutralize harmonics of the three-phase ac circuit, thereby ensuring stability of the three-phase ac circuit. The pre-charge circuit 1222 and the protection circuit 1223 function to protect the compensation circuit 1221 and the switch circuit 1224, and can effectively reduce the adverse effect of the high frequency harmonics on the components of the switch circuit 1224 and the compensation circuit 1221, thereby improving the service life and safety of the switch circuit 1224 and the compensation circuit 1221, and further improving the service life and safety of the filter protection circuit 1.
Further, the switch circuit 1224 is a MOS full bridge rectifier circuit.
Understandably, the design that the switch circuit 1224 is an MOS transistor full-bridge rectifier circuit can effectively improve the width of the filtering channel of the active filter circuit 122, and further ensure the filtering performance of the active filter circuit 122 for higher harmonics and multiple harmonics, that is, further improve the filtering performance of the filter protection circuit 1.
Further, the precharge circuit 1222 includes a precharge resistor R2 and a precharge switch K2 connected in parallel with the precharge resistor R2. The design of the pre-charging resistor R2 and the pre-charging switch K2 can effectively prevent the damage of the excessive instantaneous current to the compensation circuit 1221, thereby effectively improving the safety of the filter protection circuit 1.
Further, the protection circuit 1223 includes a fuse F1 and a diode D1, an anode of the diode D1 is connected to the fuse F1, and a cathode of the diode D1 is connected to an input terminal of the pre-charge circuit.
It can be understood that the protection circuit 1223 can be blown out in time when the current in the active filter circuit 122 is too large, so as to protect the whole active filter circuit 122 and prevent the components from being damaged by the too large current.
The utility model discloses the second embodiment provides a filtering protection equipment 2 for three-phase alternating current circuit, and filtering protection equipment includes main part 21 and sets up the circuit module 22 on main part 21, and circuit module 22 is the filtering protection circuit 1 in the first embodiment.
It can be understood that the filter protection device 2 has the same beneficial effects as the filter protection circuit 1 in the first embodiment, and the details are not described herein.
Compared with the prior art, the utility model provides a pair of filter protection circuit and equipment has following advantage:
1. the embodiment of the utility model provides a filter protection circuit through the design that passive filter module and active filter module combine for higher stability and maintainability can be guaranteed to filter protection circuit, higher response speed and compensation precision can be guaranteed again. The start and stop of large-scale nonlinear equipment in the three-phase alternating current circuit easily generates large impact on a power transmission network to generate overhigh harmonic, and the passive filtering module can effectively and stably perform reactive compensation to improve the stability of the power transmission network, so that the power loss is reduced. In addition, one of the first passive filter circuit and the second passive filter circuit is an RC filter, and the other one is an LC filter, so that the passive filter module has a better filtering effect on low-frequency harmonic waves and high-frequency harmonic waves, and the stable effect of the filter protection circuit on the three-phase alternating current circuit can be further ensured. In addition, to three-phase alternating current circuit's fluctuation, active filter module can detect through load sampling circuit fast to control circuit can change fluctuation control switching power supply ground mode in time, and then carry out accurate reactive compensation to the transmission network through active filter circuit, thereby further improve filter protection circuit to three-phase alternating current circuit's stable effect.
2. The embodiment of the utility model provides a filter protection circuit, first passive filter circuit are for connecting in parallel in three-phase alternating current circuit's RC wave filter to the better low frequency performance of filter protection circuit has been guaranteed.
3. The embodiment of the utility model provides a filter protection circuit, second passive filter circuit are including establishing ties in three-phase alternating current circuit's filter inductance and cross over the second filter capacitance design between double-phase circuit for filter protection circuit's high frequency performance is better, thereby has further improved filter protection circuit to the filter effect of high frequency harmonic. In addition, the third filter capacitor is designed to provide a path for the high-frequency harmonic, so that the high-frequency harmonic can be conducted to the ground through the third filter capacitor, the influence on a load or other elements in a circuit is avoided, and the protection performance and the stability effect of the filter protection circuit are further improved.
4. The embodiment of the utility model provides a filter protection circuit, detect compensation AC state information and transmit to control circuit's design through feedback sampling circuit, make control circuit can in time detect active filter circuit's actual compensation parameter, and control circuit can combine compensation AC state information and load AC state information in time to control switch circuit's mode of operation to reach anticipated stability in order to guarantee load AC state information, thereby active filter circuit's accuracy nature, validity and corresponding speed have further been improved.
5. The embodiment of the utility model provides a filter protection circuit, active filter circuit include the design of a plurality of parallel connection's compensation branch road, have improved active filter circuit's filter effect and reactive compensation's accuracy greatly, have also further improved filter protection circuit's reactive compensation and active compensation performance.
6. The embodiment of the utility model provides a filter protection circuit through first reactor, second reactor and compensating circuit's cooperation for active power compensation and reactive compensation can be carried out to three-phase alternating current circuit to active filter module, thereby with the harmonic neutralization of three-phase alternating current circuit, and then guarantee the stability of three-phase alternating current circuit. The pre-charging circuit and the protection circuit play a role in protecting the compensation circuit and the switching circuit, and can effectively reduce adverse effects of high-frequency harmonic waves on elements in the switching circuit and the compensation circuit, so that the service life and the safety of the switching circuit and the compensation circuit are improved, and the service life and the safety of the filter protection circuit are further improved.
7. The embodiment of the utility model provides a filter protection circuit is MOS pipe full bridge rectifier circuit's design through switch circuit, can effectively improve active filter circuit's filtering channel width to further guaranteed active filter circuit to the filtering capability of higher harmonic and multiple harmonic, also further improved filter protection circuit's filtering capability.
8. The embodiment of the utility model provides a pair of filtering protection equipment has the same beneficial effect with above-mentioned a filtering protection circuit, no longer gives unnecessary details here.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A filter protection circuit, characterized by: the filter protection circuit comprises an active filter module and a passive filter module which are connected to a three-phase alternating current circuit;
the passive filter module comprises a first passive filter circuit and a second passive filter circuit, wherein one of the first passive filter circuit and the second passive filter circuit is an RC filter, and the other one of the first passive filter circuit and the second passive filter circuit is an LC filter;
the active filter module comprises a load sampling circuit, an active filter circuit and a control circuit, wherein the active filter circuit comprises a switch circuit, the load sampling circuit detects load alternating current state information of an output end of the three-phase alternating current circuit and sends the load alternating current state information to the control circuit, and the control circuit controls a working mode of the switch circuit according to the load alternating current state information in a preset control mode so as to filter the three-phase alternating current circuit.
2. The filter protection circuit of claim 1, wherein: the number of the first passive filter circuits is three, and the first passive filter circuits are connected with each phase circuit of the three-phase alternating current circuit in parallel in a one-to-one correspondence manner;
the first passive filter circuit comprises a first filter resistor and a first filter capacitor which are connected in series.
3. The filter protection circuit of claim 2, wherein: the number of the second passive filter circuits is three, and the second passive filter circuits are respectively connected with each phase circuit of the three-phase alternating current circuit in a one-to-one correspondence manner;
each second passive filter circuit comprises a filter inductor and a second filter capacitor, the filter inductor is connected in the three-phase alternating current circuit in series, the first end of the filter inductor is connected with the first passive filter circuit, the second end of the filter inductor is connected with the second filter capacitor, the first end of the second filter capacitor is connected with each phase circuit of the three-phase alternating current circuit in a one-to-one correspondence mode, and the second ends of the second filter capacitors are connected with each other.
4. The filter protection circuit of claim 3, wherein: each second passive filter circuit further comprises a third filter capacitor, a first end of the third filter capacitor is connected with a second end of the filter inductor, and a second end of the third filter capacitor is grounded.
5. The filter protection circuit of claim 1, wherein: the active filter circuit further comprises a feedback sampling circuit, the feedback sampling circuit detects compensation alternating current state information of the output end of the active filter circuit and sends the compensation alternating current state information to the control circuit, and the control circuit controls the switch circuit according to the compensation alternating current state information and the load alternating current state information.
6. The filter protection circuit of claim 1, wherein: the number of the active filter circuits is three, the first end of each active filter circuit is connected with each phase circuit of the three-phase alternating current circuit in a one-to-one correspondence mode, and the second end of each active filter circuit is connected with a zero line.
7. The filter protection circuit of claim 1, wherein: the active filter circuit further comprises a compensation circuit connected with the switch circuit in series, and the compensation circuit comprises a first compensation branch, a second compensation branch and a third compensation branch which are connected in parallel;
the first compensation branch comprises a first compensation capacitor, the second compensation branch comprises a second compensation capacitor and a second compensation resistor which are connected in parallel, and the third compensation branch comprises a third compensation capacitor and a third compensation resistor which are connected in parallel.
8. The filter protection circuit of claim 7, wherein: the active filter circuit also comprises a first reactor, a second reactor, a pre-charging circuit and a protection circuit which are connected in series;
the first end of the first reactor is connected with a zero line, the second end of the first reactor is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the first end of each compensation branch, the second end of each compensation branch is connected with the first end of the protection circuit, the second end of the protection circuit is connected with the first end of the pre-charging circuit, the second end of the pre-charging circuit is connected with the first end of the second reactor, and the second end of the second reactor is connected with one of the three-phase alternating-current circuits.
9. The filter protection circuit of claim 7, wherein: the switching circuit is an MOS tube full-bridge rectification circuit.
10. A filter protection device for a three-phase alternating current circuit, characterized by: the filter protection device comprises a main body and a circuit component arranged on the main body, wherein the circuit component is the filter protection circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221097459.4U CN217824272U (en) | 2022-05-07 | 2022-05-07 | Filter protection circuit and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221097459.4U CN217824272U (en) | 2022-05-07 | 2022-05-07 | Filter protection circuit and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217824272U true CN217824272U (en) | 2022-11-15 |
Family
ID=83983892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221097459.4U Active CN217824272U (en) | 2022-05-07 | 2022-05-07 | Filter protection circuit and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217824272U (en) |
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2022
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