CN215420112U - Filter circuit and frequency converter - Google Patents
Filter circuit and frequency converter Download PDFInfo
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- CN215420112U CN215420112U CN202121420193.8U CN202121420193U CN215420112U CN 215420112 U CN215420112 U CN 215420112U CN 202121420193 U CN202121420193 U CN 202121420193U CN 215420112 U CN215420112 U CN 215420112U
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- 239000003990 capacitor Substances 0.000 claims abstract description 53
- 238000005265 energy consumption Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a filter circuit and a frequency converter, wherein the filter circuit comprises: the current limiting resistor is connected with the filter capacitor; the trigger unit is connected with the filter capacitor and can generate a trigger signal according to the voltage of the filter capacitor; and the removing unit is connected with the current-limiting resistor in parallel, the triggering unit is connected with the control end of the removing unit, and the removing unit can short circuit two ends of the current-limiting resistor. The trigger unit is connected with the filter capacitor, when the trigger unit is powered on, the filter capacitor is charged and lifted to a threshold voltage, the trigger unit generates a trigger signal to be transmitted to the control end of the removal unit, the removal unit is short-circuited at two ends of the current-limiting resistor, current does not pass through the current-limiting resistor, and then the current-limiting resistor is prevented from consuming electric energy after stable operation.
Description
Technical Field
The utility model relates to the field of frequency converters, in particular to a filter circuit and a frequency converter.
Background
The frequency converter generally comprises a rectifying module, a filtering module and an inverting module, wherein the filtering module comprises a filtering capacitor and a current-limiting resistor, and a large impulse current flows through the filtering capacitor due to a short circuit just after the filtering capacitor is electrified, so that the current is limited by the current-limiting resistor to achieve a protection effect in order to avoid the damage of the rectifying module or other elements due to the impulse current.
Therefore, in the prior art, a relay and a controller are generally arranged, the relay is connected with the current-limiting resistor in parallel through a contact of the relay, the controller is connected with a coil of the relay, and after the relay is electrified for a preset time, the coil of the relay is controlled to attract the contact, so that the contact is conducted, the current-limiting resistor is removed, and the power consumption is reduced.
However, the above structure requires a controller for program control, which is complicated and not conducive to simplification of control.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the filter circuit and the frequency converter, the current-limiting resistor can be automatically removed without an additional controller, and the use is more convenient.
The utility model also provides a frequency converter which can realize the frequency conversion function and simultaneously reduce the electric energy loss during working.
A filter circuit according to an embodiment of the first aspect of the present invention includes: the current limiting resistor is connected with the filter capacitor; the trigger unit is connected with the filter capacitor and can generate a trigger signal according to the voltage of the filter capacitor; and the removing unit is connected with the current-limiting resistor in parallel, the triggering unit is connected with the control end of the removing unit, and the removing unit can short circuit two ends of the current-limiting resistor.
The filter circuit and the frequency converter provided by the embodiment of the utility model at least have the following beneficial effects: the current-limiting resistor and the filter capacitor are connected to form a filter circuit, the filter effect can be realized, the filter capacitor is connected with the trigger unit, when the filter capacitor is powered on, the filter capacitor is charged and lifted to a threshold voltage, the trigger unit generates a trigger signal to be transmitted to a control end of a removing unit, the removing unit is used for short-circuiting two ends of the current-limiting resistor, the current does not pass through the current-limiting resistor, the current-limiting resistor is prevented from consuming electric energy after stable operation, the structure can automatically short-circuit two ends of the current-limiting resistor according to the voltage of the filter capacitor, the current-limiting resistor is removed, the additional controller is not needed, and the filter capacitor is favorable for more convenient use.
According to some embodiments of the present invention, the trigger unit includes a switch Q1, an input terminal of a switch Q1 is connected to one end of the current limiting resistor, an output terminal of the switch Q1 is connected to the removing unit, and a control terminal of the switch Q1 is connected to the other end of the current limiting resistor and the filter capacitor, respectively.
According to some embodiments of the present invention, the removing unit is connected to the input terminal of the switching transistor Q1 and the output terminal of the switching transistor Q1, and the removing unit is capable of short-circuiting the input terminal of the switching transistor Q1 and the output terminal of the switching transistor Q1.
According to some embodiments of the present invention, the removing unit includes a contactor KM, one end of a contact of the contactor KM is connected to one end of the current limiting resistor and the input end of the switching tube Q1, the other end of the contact of the contactor KM is connected to the output end of the switching tube Q1 and one end of a coil of the contactor KM, and the other end of the coil of the contactor KM is connected to the other end of the current limiting resistor and the filter capacitor.
According to some embodiments of the utility model, the contactor KM further comprises a freewheeling diode, a cathode of the freewheeling diode is respectively connected with the other end of the contact of the contactor KM, the output end of the switching tube Q1 and one end of the coil of the contactor KM, and an anode of the freewheeling diode is respectively connected with the other end of the coil of the contactor KM and the other end of the current limiting resistor.
According to some embodiments of the utility model, further comprising a freewheeling resistor in series with the freewheeling diode.
According to a second aspect of the present invention, the frequency converter includes the above-mentioned filter circuit, and further includes a rectifying unit, an inverting unit, and a control unit, wherein an output end of the rectifying unit is connected to the current-limiting resistor, the filter capacitor is connected to an input end of the inverting unit, and the control unit is connected to a control end of the inverting unit.
The frequency converter provided by the embodiment of the utility model at least has the following beneficial effects: the alternating current input from the outside is rectified by the rectifying unit to form direct current and is output to the filter circuit, the filter capacitor filters the direct current to enable the direct current to be more stable, then the direct current is transmitted to the inversion unit, and the control unit controls the inversion unit to invert the direct current into alternating current with frequency meeting the use requirement and output the alternating current. In addition, the current limiting resistor in the filter circuit can prevent the current from being overlarge to damage other elements when the filter circuit is just electrified, reliability is improved, and meanwhile the trigger unit and the removing unit can remove the current limiting resistor after the current is stable, so that electric energy loss is reduced, and electric energy is saved.
According to some embodiments of the present invention, the power supply further comprises an energy consumption unit, the filter capacitor is connected to the inverter unit through the energy consumption unit, and the control unit is connected to a control end of the energy consumption unit.
According to some embodiments of the present invention, the energy consumption unit includes an energy consumption resistor R2 and a switch Q5, the energy consumption resistor R2 is connected in series with the switch Q5 to form a series circuit, one end of the series circuit is connected to one end of the filter capacitor and a first input end of the inverter unit, the other end of the series circuit is connected to the other end of the filter capacitor and a second input end of the inverter unit, and the control unit is connected to a control end of the switch Q5.
According to some embodiments of the utility model, further comprising a fuse, the filter capacitor is connected to the inverter unit through the fuse.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit diagram of one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a filter circuit according to an embodiment of the present invention includes: the current limiting resistor 100 is connected with the filter capacitor 200; the trigger unit 300 is connected with the filter capacitor 200, and the trigger unit 300 can generate a trigger signal according to the voltage of the filter capacitor 200; the removing unit 400 is connected in parallel with the current limiting resistor 100, the trigger unit 300 is connected with the control end of the removing unit 400, and the removing unit 400 can short-circuit two ends of the current limiting resistor 100.
Current-limiting resistor 100 and filter capacitor 200 are connected and are formed filter circuit, can realize the effect of filtering, be connected with filter capacitor 200 through trigger unit 300, during the circular telegram, filter capacitor 200 charges and promotes to threshold voltage, trigger unit 300 produces trigger signal and transmits to the control end of removing unit 400, remove unit 400 with current-limiting resistor 100's both ends short circuit, make the electric current not pass through current-limiting resistor 100, and then avoid current-limiting resistor 100 to consume the electric energy after the steady operation, with this structure, can be according to filter capacitor 200's voltage automatic with current-limiting resistor 100's both ends short circuit, realize the effect of removing current-limiting resistor 100, need not extra controller, it is more convenient to be favorable to making the order to use.
Referring to fig. 1, in some embodiments of the present invention, the trigger unit 300 includes a switch Q1, an input terminal of the switch Q1 is connected to one end of the current limiting resistor 100, an output terminal of the switch Q1 is connected to the removing unit 400, and a control terminal of the switch Q1 is respectively connected to the other end of the current limiting resistor 100 and the filter capacitor 200.
When the power is on, the external power supply end charges the filter capacitor 200 through the current-limiting resistor 100, the control end of the switching tube Q1 is connected with the filter capacitor 200, the voltage is increased along with the charging of the filter capacitor 200, the voltage at the control end of the switching tube Q1 is also increased, and when the voltage at the control end of the switching tube Q1 exceeds the conduction threshold value, the switching tube Q1 is conducted to generate a trigger signal and transmit the trigger signal to the withdrawing unit. Therefore, the switch tube Q1 generates the trigger signal, so that the structure is simple and the implementation is convenient.
The switching tube Q1 may be a field effect transistor or an IGBT.
Referring to fig. 1, in some embodiments of the present invention, the removing unit 400 is connected to the input terminal of the switching transistor Q1 and the output terminal of the switching transistor Q1, and the removing unit 400 is capable of short-circuiting the input terminal of the switching transistor Q1 and the output terminal of the switching transistor Q1.
Because the switching tube Q1 generates conduction loss after being turned on, the removing unit 400, after acquiring the trigger signal, shorts the two ends of the current limiting resistor 100 and also shorts the two ends of the switching tube Q1, which is beneficial to reducing the electric energy loss and reducing the heat generation.
Referring to fig. 1, in some embodiments of the present invention, the removing unit 400 includes a contactor KM, a contact of the contactor KM is connected in parallel with the current limiting resistor 100, one end of the contact of the contactor KM is connected to one end of the current limiting resistor 100, the other end of the contact of the contactor KM is connected to an output end of the switching tube Q1 and one end of a coil of the contactor KM, respectively, and the other end of the coil of the contactor KM is connected to the other end of the current limiting resistor 100.
After the switching tube Q1 is conducted, the coil current flowing through the contactor KM is gradually increased, when the current is increased to a coil attraction contact of the contactor KM, and the contact of the contactor KM is closed, because the contact of the contactor KM is connected with the switching tube in parallel, the input end and the output end of the switching tube Q1 are in short circuit, and meanwhile, the two ends of the current-limiting resistor 100 are in short circuit through a branch formed by the contact of the contactor KM and the coil. With the structure, after the switching tube Q1 is conducted, the contactor KM can simultaneously short-circuit the switching tube Q1 and the current-limiting resistor 100, namely, the switching tube Q1 and the current-limiting resistor 100 are removed, so that the conduction loss of the switching tube Q1 and the loss of the current-limiting resistor 100 are avoided, and the loss generated when the contact and the coil of the contactor KM flow through current is very low, thereby being beneficial to saving electric energy.
Referring to fig. 1, in some embodiments of the present invention, a freewheeling diode 500 is further included, a cathode of the freewheeling diode 500 is connected to the other end of the contact of the contactor KM, the output end of the switching tube Q1, and one end of the coil of the contactor KM, respectively, and an anode of the freewheeling diode 500 is connected to the other end of the coil of the contactor KM and the other end of the current limiting resistor 100, respectively.
Because the coil energy storage characteristic of the contactor KM can generate reverse potential after the power failure, in order to protect other elements in the circuit, the fly-wheel diode 500 is connected with the coil in parallel to form a loop, and the coil energy storage of the contactor KM can be consumed in the loop, thereby being beneficial to improving the reliability.
Referring to fig. 1, in some embodiments of the utility model, a freewheeling resistor 510 is also included in series with the freewheeling diode 500.
Through the series connection of the follow current resistor 510 and the follow current diode 500, the follow current resistor 510 can accelerate the consumption of the coil energy storage of the contactor KM, and the improvement of the safety is facilitated.
Referring to fig. 1, the frequency converter according to the second embodiment of the present invention includes the above-mentioned filter circuit, and further includes a rectifying unit 600, an inverting unit 700, and a control unit, wherein an output end of the rectifying unit 600 is connected to the current-limiting resistor 100, the filter capacitor 200 is connected to an input end of the inverting unit 700, and the control unit is connected to a control end of the inverting unit 700.
The rectifying unit 600 rectifies the externally input alternating current to form a direct current, the direct current is output to the filter circuit, the filter capacitor 200 filters the direct current to make the direct current more stable, then the direct current is transmitted to the inverter unit 700, and the control unit controls the inverter unit 700 to invert the direct current into an alternating current with a frequency meeting the use requirement and output the alternating current. In addition, the current limiting resistor 100 in the filter circuit can prevent the current from being too large to damage other elements when the filter circuit is just powered on, so that the reliability is improved, and meanwhile, the trigger unit 300 and the removing unit 400 can remove the current limiting resistor 100 after the current is stable, so that the electric energy loss is reduced, and the electric energy is saved.
The rectifying unit 600 may be a common three-phase rectifying bridge, a three-phase rectifying circuit, or other devices or circuit embodiments. The inverter unit 700 may be an embodiment of a common three-phase inverter circuit or the like. The control unit can be a single chip microcomputer, a PLC or an embedded chip and other devices or modules with control functions.
Referring to fig. 1, in some embodiments of the present invention, an energy consumption unit 800 is further included, the filter capacitor 200 is connected to the inverter unit 700 through the energy consumption unit 800, and the control unit is connected to a control terminal of the energy consumption unit 800.
Under the circumstances that the converter is used with the motor cooperation, when the converter stopped, the motor can produce the back electromotive force input and advance contravariant unit 700 under inertia orders about the rotation, absorbs the back electromotive force that the motor produced through being provided with energy consumption unit 800, is favorable to protecting the component in the contravariant unit 700 and avoids damaging, is favorable to improving the reliability.
Referring to fig. 1, in some embodiments of the present invention, the power consumption unit 800 includes a power consumption resistor R2 and a switching tube Q5, the power consumption resistor R2 is connected in series with the switching tube Q5 to form a series circuit, one end of the series circuit is connected to one end of the filter capacitor 200 and a first input terminal of the inverter unit 700, the other end of the series circuit is connected to the other end of the filter capacitor 200 and a second input terminal of the inverter unit 700, and the control unit is connected to a control terminal of the switching tube Q5.
After the external alternating current input to the rectifying unit 600 is stopped and the inverter unit 700 stops working, the control unit controls the switching tube Q5 to be turned on, so that the reverse electromotive force generated by the external motor is consumed too much through the energy consumption resistor R2.
Referring to fig. 1, in some embodiments of the present invention, a fuse 900 is further included, and the filter capacitor 200 is connected to the inverter unit 700 through the fuse 900.
Through being provided with fuse 900, can be when the fault current too big threshold value that surpasss fuse 900, fuse 900 takes place to melt, avoids inverter unit 700 to damage, is favorable to improving the reliability.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The utility model is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the utility model, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (10)
1. A filter circuit, comprising:
the current limiting resistor (100) and the filter capacitor (200), wherein the current limiting resistor (100) is connected with the filter capacitor (200);
a trigger unit (300) connected to the filter capacitor (200), wherein the trigger unit (300) is capable of generating a trigger signal according to the voltage of the filter capacitor (200);
and the removing unit (400) is connected with the current limiting resistor (100) in parallel, the triggering unit (300) is connected with the control end of the removing unit (400), and the removing unit (400) can short circuit two ends of the current limiting resistor (100).
2. The filter circuit of claim 1, wherein: the trigger unit (300) comprises a switch tube Q1, the input end of a switch tube Q1 is connected with one end of the current limiting resistor (100), the output end of the switch tube Q1 is connected with the removing unit (400), and the control end of the switch tube Q1 is respectively connected with the other end of the current limiting resistor (100) and the filter capacitor (200).
3. The filter circuit of claim 2, wherein: the removing unit (400) is connected with the input end of the switch tube Q1 and the output end of the switch tube Q1, and the removing unit (400) can short-circuit the input end of the switch tube Q1 and the output end of the switch tube Q1.
4. The filter circuit of claim 3, wherein: the removing unit (400) comprises a contactor KM, one end of a contact of the contactor KM is connected with one end of the current-limiting resistor (100) and the input end of the switch tube Q1, the other end of the contact of the contactor KM is connected with the output end of the switch tube Q1 and one end of a coil of the contactor KM, and the other end of the coil of the contactor KM is connected with the other end of the current-limiting resistor (100) and the filter capacitor (200) respectively.
5. The filter circuit of claim 4, wherein: the contactor is characterized by further comprising a freewheeling diode (500), the cathode of the freewheeling diode (500) is connected with the other end of the contact of the contactor KM, the output end of the switch tube Q1 and one end of the coil of the contactor KM, and the anode of the freewheeling diode (500) is connected with the other end of the coil of the contactor KM and the other end of the current limiting resistor (100) respectively.
6. The filter circuit of claim 5, wherein: further comprising a freewheeling resistor (510) in series with the freewheeling diode (500).
7. Converter, its characterized in that: the filter circuit of any one of claims 1 to 6, further comprising a rectifying unit (600), an inverting unit (700), and a control unit, wherein an output terminal of the rectifying unit (600) is connected to the current limiting resistor (100), the filter capacitor (200) is connected to an input terminal of the inverting unit (700), and the control unit is connected to a control terminal of the inverting unit (700).
8. The frequency converter of claim 7, wherein: the power supply system is characterized by further comprising an energy consumption unit (800), the filter capacitor (200) is connected with the inverter unit (700) through the energy consumption unit (800), and the control unit is connected with the control end of the energy consumption unit (800).
9. The frequency converter of claim 8, wherein: the energy consumption unit (800) comprises an energy consumption resistor R2 and a switch tube Q5, the energy consumption resistor R2 is connected with the switch tube Q5 in series to form a series circuit, one end of the series circuit is connected with one end of the filter capacitor (200) and a first input end of the inversion unit (700), the other end of the series circuit is connected with the other end of the filter capacitor (200) and a second input end of the inversion unit (700), and the control unit is connected with a control end of the switch tube Q5.
10. The frequency converter of claim 7, wherein: the filter circuit further comprises a fuse (900), and the filter capacitor (200) is connected with the inverter unit (700) through the fuse (900).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121420193.8U CN215420112U (en) | 2021-06-24 | 2021-06-24 | Filter circuit and frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121420193.8U CN215420112U (en) | 2021-06-24 | 2021-06-24 | Filter circuit and frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215420112U true CN215420112U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121420193.8U Active CN215420112U (en) | 2021-06-24 | 2021-06-24 | Filter circuit and frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215420112U (en) |
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2021
- 2021-06-24 CN CN202121420193.8U patent/CN215420112U/en active Active
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