CN220857914U - Driving circuit with filtering function - Google Patents
Driving circuit with filtering function Download PDFInfo
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- CN220857914U CN220857914U CN202322180406.XU CN202322180406U CN220857914U CN 220857914 U CN220857914 U CN 220857914U CN 202322180406 U CN202322180406 U CN 202322180406U CN 220857914 U CN220857914 U CN 220857914U
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- 238000001914 filtration Methods 0.000 title claims abstract description 69
- 239000003990 capacitor Substances 0.000 claims description 64
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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 driving circuit with a filtering function, which is used for providing voltage input by a power grid into equipment to be driven, wherein the input end of the driving circuit is coupled with the output end of the power grid, and the output end of the driving circuit is coupled with the input end of the equipment to be driven, so that harmonic interference input from the power grid and electromagnetic interference in the driving circuit are filtered and inhibited, and meanwhile, interference signals of the equipment to be driven to the driving circuit and the power grid are reduced. According to the utility model, by arranging at least one filtering unit, external interference can be effectively restrained from entering the equipment to be driven, and meanwhile, the interference of the driving circuit to the external is restrained. And by adopting step-by-step filtering, differential mode and common mode interference can be filtered in each step of filtering, and the filtering level can be selected according to the actual filtering requirement.
Description
Technical Field
The utility model relates to a driving circuit with a filtering function, and belongs to the technical field of driving circuits.
Background
Since there is a circuit conversion of AC (alternating current) -DC (direct current) -AC (direct current) and a conversion of the high frequency switch in the compressor driving circuit, as little as possible of the interference signal is required in the conversion process, it is necessary to attenuate the interference source (power grid) and effectively suppress the interference signal in the conversion process (high frequency switch). In addition, the harmonic content in the power grid signal is more, and in the conversion process, larger interference can be brought due to the action of the high-frequency switch, and meanwhile, more interference can be brought to the power grid, in order to cut down and restrain interference signals, a reasonable filter is designed, the interference signals are filtered and restrained, the normal operation of the later stage is ensured, and meanwhile, the interference signals of equipment to the outside are reduced.
Disclosure of utility model
The primary technical problem to be solved by the utility model is to provide a driving circuit with a filtering function, which solves the problems of harmonic interference from a power grid and electromagnetic interference caused by a high-frequency switch in a compressor or a clicked driving circuit.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
A driving circuit with a filtering function is used for providing voltage input by a power grid to equipment to be driven, wherein the input end of the driving circuit is coupled with the output end of the power grid, the output end of the driving circuit is coupled with the input end of the equipment to be driven, and the driving circuit is used for filtering and inhibiting harmonic interference input from the power grid and electromagnetic interference in the driving circuit, and meanwhile interference signals of the equipment to be driven to the driving circuit and the power grid are reduced.
Preferably, the driving circuit comprises a first filtering unit, a conversion unit and a second filtering unit,
The input end of the first filtering unit is coupled with the output end of the power grid, and the output end of the first filtering unit is coupled with the input end of the conversion unit;
The input end of the conversion unit is coupled with the output end of the first filtering unit, and the output end of the conversion unit is coupled with the input end of the second filtering unit;
The input end of the second filtering unit is coupled with the output end of the conversion unit, and the output end of the second filtering unit is coupled with the input end of the equipment to be driven.
Wherein preferably the device to be driven is a compressor or a motor.
Preferably, the first filtering unit comprises a first differential mode inductor, a second differential mode inductor, a first differential mode capacitor, a second differential mode capacitor, a third common mode capacitor, a fourth common mode capacitor, a fifth differential mode capacitor, a first common mode inductor and a second common mode inductor,
The input end of the first differential mode inductor is coupled with the positive electrode of the power supply, and the output end of the first differential mode inductor is coupled with one end of the first differential mode capacitor;
the input end of the second differential mode inductor is coupled with the negative electrode of the power supply, and the output end of the second differential mode inductor is coupled with one end of the first differential mode capacitor;
The input end of the first common mode inductor is respectively coupled with two ends of the first differential mode capacitor, and the output end of the first common mode inductor is respectively coupled with two ends of the second differential mode capacitor;
One end of the third common mode capacitor is coupled with one end of the second differential mode capacitor, and the other end of the third common mode capacitor is grounded;
One end of the fourth common mode capacitor is coupled with the other end of the second differential mode capacitor, and the other end of the fourth common mode capacitor is grounded;
one end of the second common mode inductor is respectively coupled with one end of the third common mode capacitor and one end of the fourth common mode capacitor, and the other end of the second common mode inductor is respectively coupled with two ends of the fifth common mode capacitor.
Preferably, the voltage regulator further comprises a first resistor, one end of the first resistor is coupled with one end of the first differential mode capacitor, and the other end of the first resistor is coupled with the other end of the first differential mode capacitor, so that the voltage in the first differential mode capacitor is ensured to be discharged to a safe voltage.
Wherein the filter device preferably further comprises a drive board input path, the input end of the drive board input path is coupled with the output end of the first filter unit, the output end of the power grid is coupled with the input end of the conversion unit, and the power grid is used for filtering common mode and differential mode interference from the power grid to ensure that the conversion equipment is not interfered.
Compared with the prior art, the utility model can effectively inhibit external interference from entering the equipment to be driven by arranging at least one filtering unit, and simultaneously inhibit the interference of the driving circuit to the external. And by adopting step-by-step filtering, differential mode and common mode interference can be filtered in each step of filtering, and the filtering level can be selected according to the actual filtering requirement.
Drawings
Fig. 1 is a connection diagram of a driving circuit with filtering function coupled to a power grid and a device to be driven according to a first embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of the first filter unit of FIG. 1;
Fig. 3 is a connection diagram of a driving circuit 1 with filtering function coupled to a power grid and a device to be driven according to a second embodiment of the present utility model.
Detailed Description
The technical contents of the present utility model will be described in detail with reference to the accompanying drawings and specific examples.
(First embodiment)
As shown in fig. 1, an embodiment of the present utility model provides a driving circuit 1 with a filtering function, an input end of which is coupled to an output end of a power grid, and an output end of which is coupled to an input end of a device to be driven 3. The driving circuit 1 with the filtering function provides the voltage input by the power grid for the equipment 3 to be driven, filters and suppresses harmonic interference input by the power grid 2 and electromagnetic interference brought by high-frequency switches in the driving circuit 1, ensures the normal operation of subsequent equipment, and reduces interference signals of the equipment 3 to be driven to the driving circuit 1 and the power grid 2.
Specifically, the driving circuit 1 with a filtering function provided in the embodiment of the present utility model includes a first filtering unit 11, a converting unit 12, and a second filtering unit 13. The input of the first filter unit 11 is coupled to the output of the power grid 2, and its output is coupled to the input of the conversion unit 12. The input of the conversion unit 12 is coupled to the output of the first filtering unit 11 and its output is coupled to the input of the second filtering unit 13. The input of the second filter unit 13 is coupled to the output of the conversion unit 12 and its output is coupled to the input of the device 3 to be driven. In the embodiment of the present utility model, the device 3 to be driven is a compressor or a motor.
The first filtering unit 11 will filter and suppress the harmonic interference input from the grid 2 while reducing the interference of the interference signal generated by the conversion unit 12 during the conversion to the grid.
Similarly, the second filtering unit 13 will filter and suppress the interference signal generated during the conversion from the converting unit 12, while reducing the interference of the interference signal of the device 3 to be driven to the converting unit 12.
The first filter unit 11 and the second filter unit 13 have the same circuit structure and operation principle. Only the first filtering unit 11 will be described in detail below.
As shown in fig. 2, the first filtering unit 11 includes a first differential-mode inductor L1, a second differential-mode inductor L2, a first differential-mode capacitor C1, a second differential-mode capacitor C2, a third common-mode capacitor C3, a fourth common-mode capacitor C4, a fifth differential-mode capacitor C5, a first common-mode inductor L3, and a second common-mode inductor L4. The input end of the first differential-mode inductor L1 is coupled to the positive electrode of the power supply 2, and the output end thereof is coupled to one end of the first differential-mode capacitor C1. The input end of the second differential-mode inductor L2 is coupled to the negative electrode of the power supply 2, and the output end thereof is coupled to one end of the first differential-mode capacitor C1. The input end of the first common-mode inductor L3 is coupled to two ends of the first differential-mode capacitor C1, and the output end thereof is coupled to two ends of the second differential-mode capacitor C2. One end of the third common-mode capacitor C3 is coupled to one end of the second differential-mode capacitor C2, and the other end is grounded. One end of the fourth common-mode capacitor C4 is coupled to the other end of the second differential-mode capacitor C2, and the other end is grounded. One end of the second common-mode inductor L4 is coupled to one end of the third common-mode capacitor C3 and one end of the fourth common-mode capacitor C4, respectively, and the other end thereof is coupled to two ends of the fifth common-mode capacitor C5, respectively.
The first differential-mode inductance L1 and the second differential-mode inductance L2 are differential-mode inductances for maintaining the current abrupt change, and can suppress differential-mode interference input from the power supply 2, and can suppress differential-mode interference of the conversion unit 12 itself conducted to the outside. The first differential mode capacitor C1, the second differential mode capacitor C2 and the fifth differential mode capacitor C5 are differential mode capacitors for maintaining voltage abrupt change, and can filter differential mode interference. Differential mode interference exists in the respective disturbances on the transmission line, which have equal and opposite magnitudes on the transmission. The first common-mode inductance L3 is a common-mode inductance, and common-mode interference can be suppressed. Common mode interference is the interference that exists between the transmission line and ground and is logically equally sized and oriented. And also to suppress the common mode interference of the switching unit 12 itself from being conducted to the outside. The third common mode capacitor C3 and the fourth common mode capacitor C4 are common mode capacitors, and can filter common mode interference in the circuit.
The driving circuit 1 with the filtering function provided by the embodiment of the utility model further comprises a first resistor R. One end of the first resistor is coupled to one end of the first differential-mode capacitor C1, and the other end of the first resistor is coupled to the other end of the first differential-mode capacitor C1. The first resistor R is used for ensuring electrical safety and safety of the device, namely, after the output is suddenly interrupted, a higher voltage is present in the first differential-mode capacitor C1, and the first resistor R is used for ensuring that the voltage in the first differential-mode capacitor C1 is discharged to a safe voltage. When the parameter selection of the first filtering unit 11 is the limit condition, the first silver bead 111 and the second silver bead 112 can be additionally arranged to better filter out the interference brought by the power grid 2 and meet the test requirement without increasing the number of stages of the first filtering unit 11, thereby reducing the influence of the subsequent stage, and inhibiting the transmission of interference signals. The first silver bead 111 is coupled to one end of the fifth differential mode capacitor C5, and the second silver bead 112 is coupled to the other end of the fifth differential mode capacitor C5.
(Second embodiment)
This embodiment is different from the first embodiment in only a part. Only the different parts will be described in detail, and the parts identical to those of the first embodiment will not be described again.
As shown in fig. 3, a driving circuit 1' with a filtering function according to a second embodiment of the present utility model further includes a driving board input circuit 14. The input end of the driving board input circuit 14 is coupled to the output end of the first filtering unit 11, and the output end thereof is coupled to the input end of the converting unit 12. The drive plate input path 14 is a second stage of filtering to filter out interference from the switching device to the motor or compressor while also suppressing the conduction of the motor or compressor interference to the switching device.
In summary, according to the driving circuit with the filtering function provided by the embodiment of the utility model, by arranging at least one filtering unit, external interference can be effectively restrained from entering the equipment to be driven, and meanwhile, the driving circuit can also restrain the interference to the external. And by adopting step-by-step filtering, differential mode and common mode interference can be filtered in each step of filtering, and the filtering level can be selected according to the actual filtering requirement.
It should be noted that, the embodiments of the present utility model may be combined to form new embodiments, which are all within the scope of the present utility model.
It should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The present utility model has been described in detail. Any obvious modifications to the present utility model, without departing from the spirit thereof, would constitute an infringement of the patent rights of the utility model and would take on corresponding legal liabilities.
Claims (6)
1. A drive circuit with filtering function for providing the voltage input by the power grid to the equipment to be driven, characterized in that: the input end of the driving circuit is coupled with the output end of the power grid, and the output end of the driving circuit is coupled with the input end of the equipment to be driven, so that harmonic interference input from the power grid and electromagnetic interference in the driving circuit are filtered and restrained, and meanwhile interference signals of the equipment to be driven to the driving circuit and the power grid are reduced.
2. The driver circuit with filtering function of claim 1, wherein: the driving circuit comprises a first filtering unit, a conversion unit and a second filtering unit,
The input end of the first filtering unit is coupled with the output end of the power grid, and the output end of the first filtering unit is coupled with the input end of the conversion unit;
the input end of the conversion unit is coupled with the output end of the first filtering unit, and the output end of the conversion unit is coupled with the input end of the second filtering unit;
The input end of the second filtering unit is coupled with the output end of the conversion unit, and the output end of the second filtering unit is coupled with the input end of the equipment to be driven.
3. The driver circuit with filtering function of claim 2, wherein: the equipment to be driven is a compressor or a motor.
4. The driver circuit with filtering function of claim 2, wherein: the first filtering unit comprises a first differential mode inductance, a second differential mode inductance, a first differential mode capacitance, a second differential mode capacitance, a third common mode capacitance, a fourth common mode capacitance, a fifth differential mode capacitance, a first common mode inductance and a second common mode inductance,
The input end of the first differential mode inductor is coupled with the positive electrode of the power supply, and the output end of the first differential mode inductor is coupled with one end of the first differential mode capacitor;
the input end of the second differential mode inductor is coupled with the negative electrode of the power supply, and the output end of the second differential mode inductor is coupled with one end of the first differential mode capacitor;
The input end of the first common mode inductor is respectively coupled with two ends of the first differential mode capacitor, and the output end of the first common mode inductor is respectively coupled with two ends of the second differential mode capacitor;
one end of the third common mode capacitor is coupled with one end of the second differential mode capacitor, and the other end of the third common mode capacitor is grounded;
one end of the fourth common mode capacitor is coupled with the other end of the second differential mode capacitor, and the other end of the fourth common mode capacitor is grounded;
One end of the second common mode inductor is respectively coupled with one end of the third common mode capacitor and one end of the fourth common mode capacitor, and the other end of the second common mode inductor is respectively coupled with two ends of the fifth common mode capacitor.
5. The driver circuit with filtering function of claim 4, wherein: the voltage in the first differential mode capacitor is ensured to be discharged to a safe voltage.
6. The driver circuit with filtering function of claim 2, wherein: the input end of the driving plate input path is coupled with the output end of the first filtering unit, and the output end of the driving plate input path is coupled with the input end of the conversion unit and is used for filtering interference from the conversion equipment to the motor or the compressor and inhibiting the interference of the motor or the compressor from being conducted to the conversion equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322180406.XU CN220857914U (en) | 2023-08-14 | 2023-08-14 | Driving circuit with filtering function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322180406.XU CN220857914U (en) | 2023-08-14 | 2023-08-14 | Driving circuit with filtering function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220857914U true CN220857914U (en) | 2024-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322180406.XU Active CN220857914U (en) | 2023-08-14 | 2023-08-14 | Driving circuit with filtering function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220857914U (en) |
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2023
- 2023-08-14 CN CN202322180406.XU patent/CN220857914U/en active Active
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