CN114257079A - Power utilization equipment and power supply system - Google Patents
Power utilization equipment and power supply system Download PDFInfo
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- CN114257079A CN114257079A CN202111588057.4A CN202111588057A CN114257079A CN 114257079 A CN114257079 A CN 114257079A CN 202111588057 A CN202111588057 A CN 202111588057A CN 114257079 A CN114257079 A CN 114257079A
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- 238000001914 filtration Methods 0.000 claims abstract description 70
- 238000012545 processing Methods 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 112
- 239000011324 bead Substances 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000012360 testing method Methods 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 description 37
- 238000010586 diagram Methods 0.000 description 11
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- 230000000694 effects Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 3
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- 238000002955 isolation Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Abstract
An electric device and a power supply system are used for reducing the number of interference clutter carried in electric energy received by a load and improving an EMC test result. The electric equipment comprises: the filter circuit comprises a first filter circuit, a second filter circuit, a third filter circuit and a load; the first end of the first filter circuit is connected with the input end of the electric equipment, the second end of the first filter circuit is grounded, and the first filter circuit receives electric energy through the input end of the electric equipment and carries out filtering processing on the received electric energy; the first end of the second filter circuit is connected with the first end of the first filter circuit, the second end of the second filter circuit is connected with the first end of the third filter circuit, and the second filter circuit receives the electric energy filtered by the first filter circuit and carries out filtering processing on the received electric energy; the first end of the third filter circuit is connected with the load, the second end of the third filter circuit is grounded, and the third filter circuit receives the electric energy filtered by the second filter circuit, filters the received electric energy and outputs the electric energy to the load.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to electric equipment and a power supply system.
Background
The transmission line is used as a transmission medium of electric energy and can be connected between a load and a power supply to realize the electric energy transmission between the power supply and the load.
In practical applications, a part of the interference noise is carried by the electric energy output by the power supply, and a series of interference noise is easily generated on the transmission line when the electric energy output by the power supply is transmitted through the transmission line, and the interference noise may reduce the power supply quality of the power supply and may cause an electromagnetic compatibility (EMC) test of the power supply to fail. The conventional method for filtering interference noise is to provide a filter capacitor between the input side of the load and the ground, but the filter capacitor has a low filtering capability for the interference noise generated in the transmission process, so how to reduce the amount of the interference noise received by the load becomes a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides an electric equipment and power supply system, can reduce the interference clutter quantity that carries in the electric energy that the load received, improves EMC test result.
In a first aspect, an embodiment of the present application provides an electric device, which may be connected to a power source through a transmission line and receive electric energy output by the power source through the transmission line. Specifically, the electric device includes: the circuit comprises a first filter circuit, a second filter circuit, a third filter circuit and a load.
The first end of the first filter circuit is connected with the input end of the electric equipment, the output end of the first filter circuit is grounded, and the first filter circuit is used for receiving electric energy output by the power supply through the input end of the electric equipment and filtering the received electric energy; the first end of the second filter circuit is connected with the first end of the first filter circuit, the second end of the second filter circuit is connected with the first end of the third filter circuit, and the second filter circuit is used for receiving the electric energy filtered by the first filter circuit and filtering the received electric energy; the first input end of the third filter circuit is connected with the load, the output end of the third filter circuit is grounded, and the third filter circuit is used for receiving the electric energy filtered by the second filter circuit, filtering the received electric energy, outputting the filtered electric energy to the load and supplying power to the load.
By adopting the electric equipment, the input end of the electric equipment is connected with the transmission line and can receive the electric energy output by the power supply through the transmission line, the first end of the first filter circuit is connected with the transmission line, the first filtering processing can be carried out on the interference clutter carried in the received electric energy, and a part of the interference clutter is transmitted to the ground wire through the second end of the first filtering circuit, the second filtering circuit converts a part of the interference clutter carried in the electric energy after the first filtering processing into heat energy, thereby realizing the second filtering processing of the electric energy, outputting the electric energy for eliminating part of the interference clutter to a third filter circuit, transmitting the residual interference clutter carried in the received electric energy to the ground wire by the third filter circuit, therefore, the final filtering processing of the electric energy is realized, the number of interference clutter carried in the electric energy received by the load is reduced, and an EMC test result is improved.
In one possible embodiment, the first filter circuit comprises at least one first filter capacitor.
The first end of each first filter capacitor is connected with the first end point of the input end of the electric equipment, and the second end of each first filter capacitor is grounded. And a first end point of the input end of the electric equipment is used for being connected with the positive pole of the power supply, and a second end point of the input end of the electric equipment is used for being connected with the negative pole of the power supply.
By adopting the electric equipment, the electric energy received by the electric equipment can be filtered for the first time through the first filter capacitor in the first filter circuit, and part of interference clutter carried in the electric energy is filtered.
In a possible design, if the first filter circuit includes a plurality of first filter capacitors, the capacitance values of the plurality of first filter capacitors are different.
By adopting the electric equipment, the capacitance values of the first filter capacitors in the first filter circuit are different, so that the interference clutter of different frequencies is filtered by each filter capacitor, and the interference clutter filtering effect of the first filter circuit is ensured.
In one possible design, the first target filter capacitor is a filter capacitor with the smallest capacitance value among the plurality of first filter capacitors, the remaining first filter capacitors are filter capacitors except the first target filter capacitor among the plurality of first filter capacitors, and the capacitance value of each of the remaining first filter capacitors is N times that of the first target filter capacitor. N is a natural number divided by ten.
In one possible design, the second filter circuit comprises at least one magnetic bead.
The first end of each magnetic bead is connected with the first end of the first filter capacitor, and the second end of each magnetic bead is connected with the first end of the third filter circuit.
By adopting the electric equipment, when the load in the electric equipment receives the electric energy output by the power supply through the input end of the electric equipment, the magnetic bead arranged between the input end of the electric equipment and the load can carry out secondary filtering on the electric energy after primary filtering processing, and the interference clutter carried in the electric energy after the primary filtering processing is filtered.
In a possible design, the maximum current allowed by the magnetic beads in the second filter circuit is greater than or equal to the operating current value of the power supply.
By adopting the electric equipment, when the load is changed to cause the current output by the power supply to rise, the magnetic beads can normally transmit the electric energy output by the power supply without damage, so that the normal operation of the electric equipment is protected.
In one possible design, the third filtering circuit includes: at least one second filter capacitor.
And the first end of each second filter capacitor is connected with the second end of the second filter circuit, and the second end of each second filter capacitor is grounded.
By adopting the electric equipment, the electric energy after the two filtering processes can be subjected to the third filtering process through the second filtering capacitor in the third filtering circuit, and interference clutter carried in the electric energy after the two filtering processes is filtered.
In a possible design, if the third filter circuit includes a plurality of second filter capacitors, the capacitance values of the plurality of second filter capacitors are different.
By adopting the electric equipment, the capacitance values of the second filter capacitors in the third filter circuit are different, so that the interference clutter of different frequencies is filtered by each second filter capacitor, and the interference clutter filtering effect of the third filter circuit is ensured.
In one possible design, the second target filter capacitor is a filter capacitor with the smallest capacitance value among the plurality of second filter capacitors, the remaining second filter capacitors are filter capacitors except the second target filter capacitor among the plurality of second filter capacitors, and the capacitance value of each of the remaining second filter capacitors is J times of the second target filter capacitor. Where J is a natural number divided by ten.
In one possible design, the consumer further includes a voltage conversion circuit connected between the load and the first end of the third filter circuit.
The voltage conversion circuit is used for performing voltage conversion on the electric energy subjected to filtering processing by the third filter circuit and outputting the electric energy subjected to voltage conversion to the load.
By adopting the electric equipment, the electric energy voltage output by the power supply can be converted into the power supply voltage of the load by using the voltage conversion circuit, so that the requirement of the load on the voltage is met.
In a second aspect, the present application provides a power supply system comprising a power supply and the electrical device of any of the above aspects. The power supply is connected with the electric equipment and supplies power to the electric equipment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a power supply provided in an embodiment of the present application;
fig. 2 is a first schematic structural diagram of an electrical device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an electric device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a first filter circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a second filter circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic equivalent circuit diagram of a magnetic bead according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a third filter circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a power supply system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that "at least one" in the description of the present application means one or more, where a plurality means two or more. In view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present invention. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified. In addition, it is to be understood that the terms first, second, etc. in the description of the present application are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
At present, the application of power supply technology is becoming mature. By power supply, it is meant that a load (e.g., a mobile phone, a tablet computer, etc.) may obtain power from other devices (e.g., a power grid or a storage battery) in a wired/wireless manner. Generally, the power supply is wired, that is, the power transmission is performed by means of a conductive transmission line, so as to realize the power supply of the load device.
Illustratively, as shown in fig. 1, a transmission line 30 is connected between the power source 10 and the load 20, and the transmission line mainly includes an a interface and a B interface. The interface a may be used as a power interface, and the interface B may be used as a load interface. The power source 10 may output power to the a interface, and power received by the a interface of the transmission line 30 is transmitted to the B interface and input to the load 20 through the B interface. And further, the electric energy input by the interface B can be used for supplying power to the load.
In actual use, when the power supply 10 outputs electric energy to the load 20 through the transmission line 30, the electric energy output by the power supply 10 carries interference noise, and the electric energy output by the power supply 10 also generates interference noise in the transmission process through the transmission line 30, and the interference noise is output to the load together to form an interference source of the load, which affects the normal operation of the load and can cause the EMC test of the power supply not to pass.
At present, a filtering capacitor is disposed at an electric energy input side of a load, and the filtering capacitor may filter electric energy received by the load before the electric energy is input to a device in the load. However, the filtering capacity of the filter capacitor for only interfering the noise is limited, and the filtering effect of the filter circuit on the interference noise generated in the electric energy transmission process is poor, so that a large amount of interference noise still exists when the device in the load receives the electric energy, and the EMC test result of the power supply is influenced.
In view of this, the embodiment of the present application provides an electric device and a power supply system, which are used to reduce the number of interference noise carried by electric energy received by a load and improve an EMC test result.
Fig. 2 is a schematic structural diagram of an electric device according to an embodiment of the present application. Referring to fig. 2, an input terminal of the electric device 200 is connected to a power supply through a transmission line, and the electric device 200 includes a first filter circuit 201, a second filter circuit 202, a third filter circuit 203, and a load 204.
A first end of the first filter circuit 201 is connected to an input end of the electric device 200, and a second end of the first filter circuit 201 is grounded. A first terminal of the second filter circuit 202 is connected to a first terminal of the first filter circuit 201, and a second terminal of the second filter circuit is connected to a first terminal of the third filter circuit 203. A first terminal of the third filter circuit 203 is connected to the load 204, and a second terminal of the third filter circuit 203 is grounded.
The first filter circuit 201 is configured to receive electric energy output by a power supply through an input end of the electric device 200, and perform filtering processing on the received electric energy; the second filter circuit 202 is configured to receive the electric energy filtered by the first filter circuit 201, and perform filtering processing on the received electric energy; the third filter circuit 203 is configured to receive the electric energy filtered by the second filter circuit 202, perform filtering processing on the received electric energy, output the filtered electric energy to the load 204, and supply power to the load 204.
Referring to the structure shown in fig. 2, the electric equipment 200 is provided with the first filter circuit 201, the second filter circuit 202 and the third filter circuit 203, when the power supply transmits electric energy to the electric equipment 200 through the transmission line, before the electric energy is received by the load 204 in the electric equipment 200, the three filter circuits in the electric equipment 200 perform three-time filter processing on the received electric energy, most interference noise waves carried in the electric energy are filtered, so that the amount of the interference noise waves carried in the electric energy received by the load 204 is reduced, and the EMC test result of the power supply is ensured.
It should be understood that second filter circuit 202 and first filter circuit 201 and third filter circuit 203 are connected respectively in consumer 200's different position, and the connected mode is different, second filter circuit 202 and first filter circuit 201 and third filter circuit 203 adopt different filtering methods promptly, thereby when single filter device is limited to the filtering ability of target interference clutter, can use another filter circuit to filter the target clutter, thereby realize first filter circuit 201, second filter circuit 202 and third filter circuit 203 can filter the interference clutter of a plurality of types, promote consumer 200's interference clutter filtering effect, reduce the interference clutter quantity that carries in the electric energy that load 204 received. The target interference clutter may be interference clutter carried by electric energy output by the power supply itself, or interference clutter generated by the electric energy output by the power supply in a transmission process.
It should be understood that if the load 204 in the electrical device 200 is directly powered by the electrical energy transmitted by the transmission line, the voltage value of the obtained electrical energy may hardly meet the requirement of the load 204 on the supply voltage, and therefore, the electrical device 200 may further include a voltage conversion circuit 205, where the voltage conversion circuit 205 may perform voltage conversion on the electrical energy obtained on the transmission line, and then send the electrical energy after the voltage conversion to the load 204 to power the load 204, so as to meet the requirement of the load 204 on the supply voltage.
Fig. 3 is a schematic structural diagram of an electric device 200 according to an embodiment of the present disclosure. Referring to fig. 3, the electric device 200 includes: a first filter circuit 201, a second filter circuit 202, a third filter circuit 203, a load 204, and a voltage conversion circuit 205.
In the embodiment of the present application, a first terminal of the first filter circuit 201 is connected to the transmission line through the input terminal of the electric device 200, and a second terminal of the first filter circuit 201 is grounded. The first filtering circuit 201 is configured to perform a first filtering process on the electric energy received by the electric equipment 200.
During the specific use, when the power passes through the transmission line and exports the electric energy to consumer 200, first filter circuit 201 can carry out filtering process for the first time to the input received electric energy to partly interfere clutter output to the ground wire that carries in the electric energy that will consumer 200 input received, accomplish filtering process for the first time of electric energy.
In the present application, the first filter circuit 201 may include at least one first filter capacitor C1.
Specifically, when the first filter circuit 201 includes a plurality of first filter capacitors C1, the plurality of first filter capacitors C1 are connected in parallel. Referring to fig. 4, a first terminal of each first filter capacitor C1 is connected to a first terminal of the input terminals of the powered device 200, and a second terminal of each first filter capacitor C1 is grounded.
The first end point of the input end of the electric equipment 200 is used for being connected with the positive pole of the power supply, and the second end point of the input end of the electric equipment 200 is used for being connected with the negative pole of the power supply.
In actual use, in order to ensure the filtering effect of the first filter circuit 201 on the interference noise, when the first filter circuit 201 includes a plurality of first filter capacitors C1, the capacitance values of the plurality of first filter capacitors are different.
It should be understood that, the capacitance values of the plurality of first filtering capacitors C1 are different, each first filtering capacitor C1 can filter interference noise at different frequencies, so as to ensure the effect of filtering the interference noise by the first filtering circuit 201.
Optionally, the first target filter capacitor is a filter capacitor with a smallest capacitance value among the plurality of first filter capacitors, the remaining first filter capacitors are filter capacitors except the first target filter capacitor among the plurality of first filter capacitors, and the capacitance value of each first filter capacitor among the remaining first filter capacitors is N times of the first target filter capacitor. Where N is a natural number divided by ten. For example, the capacitance of the first target filter capacitor is 10 nanofarads, and the capacitance of the remaining first filter capacitors may be 10 microfarads, 100 microfarads, and the like, respectively.
A first terminal of the second filter circuit 202 is connected to a first terminal of the first filter circuit 201, and a second terminal of the second filter circuit 202 is connected to a first terminal of the third filter circuit 203. The second filter circuit 202 is configured to perform a second filtering process on the electric energy after the first filtering process.
Specifically, when the electric energy subjected to the first filtering processing by the first filter circuit 201 passes through the second filter circuit 202, the second filter circuit 202 converts the high-frequency interference clutter into heat, and the second filtering processing of the electric energy is completed.
In this application, the second filter circuit 202 may include at least one magnetic bead.
Specifically, when the second filter circuit 202 includes a plurality of magnetic beads, the plurality of magnetic beads are connected in parallel. Referring to fig. 5, a first terminal of each magnetic bead is connected to a first terminal of a first filter capacitor C1, and a second terminal of each magnetic bead is connected to a first terminal of a third filter circuit 203.
As can be seen from the above description, when the second filter circuit 202 includes a plurality of magnetic beads, the plurality of magnetic beads are connected in parallel.
When the second filter circuit 202 that this application embodiment provided is adopted to carry out filtering processing to the electric energy after first filter circuit 201 filtering processing, see fig. 6 and show, the magnetic bead equivalence in the second filter circuit 202 is for by the parallelly connected wave filter of resistance and inductance, after the high-frequency interference clutter signal that the electric energy carried passes through the magnetic bead, the magnetic bead presents the high resistance state, the high-frequency interference clutter signal converts into heat energy on the magnetic bead and consumes, can't pass through the second end output of magnetic bead, thereby realize eliminating the high-frequency interference clutter that carries in the received electric energy, accomplish the second filtering processing to the electric energy.
In practical use, the specification of the magnetic beads in the second filter circuit 202 may be set according to interference noise carried in the electric energy transmitted by the power supply through the transmission line. For example, when the electric energy transmitted by the transmission line carries 100 mhz interference noise, the magnetic beads may be selected to have a resistance value of 10-200 ohm.
The number of the magnetic beads included in the second filter circuit 202 may be set according to an electric energy parameter output by the power supply.
In practical applications, when the load 204 changes, the current output by the power supply may change, and in order to prevent the current from increasing beyond the maximum current allowed by the magnetic bead and causing the magnetic bead to fail to operate, the maximum current allowed by the magnetic bead in the second filter circuit 202 is greater than or equal to the operating current value of the power supply.
Optionally, the working current of the magnetic beads in the second filter circuit 202 may be 1.2 to 1.5 times of the working current of the load. For example, when the electric energy current output by the power supply is 5 amperes (ampere, a), and the working current of a single magnetic bead is 3A, 2 magnetic beads can be set in parallel to shunt the received electric energy current, and at this time, the maximum current allowed to pass through by a plurality of magnetic beads is 6A, which is greater than the current output by the power supply, and the magnetic beads can work normally.
It should be understood that, in the process of setting the magnetic beads in the second filter circuit 202, if the cost of a single large-sized magnetic bead is less than the cost of a plurality of small-sized magnetic beads, the single large-sized magnetic bead is preferentially used as the second filter circuit 202 in the present application, so as to reduce the manufacturing cost of the electrical device 200. The working current of the large-specification magnetic beads is larger than or equal to the total working current of the plurality of small-specification magnetic beads, and the resistance value of the large-specification magnetic beads is larger than or equal to the resistance value of the plurality of small-specification magnetic beads.
The configuration of the second filter circuit 202 is merely exemplary, and other configurations of the second filter circuit 202 may be used in actual use. For example, the second filter circuit 202 may be formed by at least one filter inductor, and the filter inductor may convert interference noise carried in the electric energy received by the electric device 200 into heat energy, thereby achieving a filtering effect on the interference noise.
In this application, the first terminal of the third filter circuit 203 is connected to the second terminal of the second filter circuit 202 and the input terminal of the voltage conversion circuit 205, and the second terminal of the third filter circuit 203 is grounded. The third filter circuit 203 is configured to perform a third filtering process on the electric energy received by the electric equipment 200.
When the electric energy is used specifically, when the electric energy subjected to filtering processing by the second filter circuit 202 passes through the first end of the third filter circuit 203, interference clutter carried in the electric energy is filtered to the ground wire through the second end of the third filter circuit 203, so that residual interference clutter in the electric energy is eliminated, and third filtering processing of the received electric energy is completed.
In this application, the third filter circuit 203 may include at least one second filter capacitor C2.
Specifically, if the third filter circuit 203 includes a plurality of second filter capacitors C2, the plurality of second filter capacitors C2 are connected in parallel. Referring to fig. 7, a first terminal of each of the second filter capacitors C2 is connected to a second terminal of the second filter circuit 202, and a second terminal of each of the second filter capacitors C2 is grounded.
In actual use, in order to ensure the filtering effect of the second filter circuit 202 on the interference noise, when the plurality of second filter capacitors C2 in the third filter circuit 203 are connected in parallel, the capacitance values of the plurality of second filter capacitors C2 are different.
It should be understood that the capacitance values of the plurality of second filtering capacitors C2 in the third filtering circuit 203 are different, and each second filtering capacitor C2 can filter interference noise of different frequencies, so as to ensure the effect of the third filtering circuit 203 on filtering the interference noise.
Optionally, the second target filter capacitor is a filter capacitor with a smallest capacitance value among the plurality of second filter capacitors, the remaining second filter capacitors are filter capacitors except the second target filter capacitor among the plurality of second filter capacitors, and the capacitance value of each second filter capacitor among the remaining second filter capacitors is J times of the second target filter capacitor. Where J is a natural number divided by ten. For example, the capacitance of the second target filter capacitor is 10 nanofarads, and the capacitance of the remaining second filter capacitors may be 10 microfarads, 100 microfarads, and the like, respectively.
In this embodiment, the voltage conversion circuit 205 is a circuit for supplying power to the load 204, an input end of the voltage conversion circuit 205 is connected to a first end of the third filtering circuit 203, an output end of the voltage conversion circuit 205 is connected to the load 204, and the voltage conversion circuit 205 may receive electric energy in the form of alternating current or direct current after being filtered for three times, convert the received electric energy into a supply voltage of the load 204, and output the supply voltage to the load 204 for supplying power.
In the embodiment of the present application, when the voltage output by the power supply is higher than the operating voltage of the load 204, the voltage converting circuit 205 is a step-down converting circuit. When the voltage output by the power supply is lower than the operating voltage of the load 204, the voltage conversion circuit 205 is a boost conversion circuit.
In the embodiment of the present application, the voltage converting circuit 205 for performing voltage conversion on the electric energy input by the transmission line may be an isolated voltage converting device. For example, an isolation transformer having a fixed ratio of the number of turns of the primary winding to the number of turns of the secondary winding may be used as the voltage conversion circuit 205, so that the electrical isolation between the power source and the load 204 may be realized while the voltage conversion is performed on the electric energy input by the transmission line, and the safety of the load 204 may be ensured when the power source or the transmission line fails. Or the voltage converting circuit 205 employs a non-isolated voltage converting device. For example, as shown in fig. 8, a conventional H-bridge rectifier circuit is used as the voltage conversion circuit 205 to convert the voltage of the electric power transmitted on the transmission line. In practical implementation, the structure of the voltage converting circuit 205 is not limited in this application.
It can be seen from the above description that the electric equipment provided by the embodiment of the present application is provided with two kinds of filter devices to perform filtering processing three times on the electric energy transmitted by the power supply through the transmission line, so that the problem of poor filtering effect of a single filter device on certain interference clutter is solved, the electric energy quality output to the voltage conversion circuit 205 is ensured, and therefore the influence of the interference clutter carried by the electric energy on the load 204 in the electric equipment is eliminated or weakened. In addition, three filter circuits are adopted to carry out filtering processing on the electric energy output by the electric energy for three times, so that all or most of interference clutter carried in the electric energy transmitted by the electric energy is eliminated, and the EMC test result of the power supply is improved.
Based on the same inventive concept, the embodiment of the application provides a power supply system. Referring to fig. 9, the power supply system 900 includes a power source 901 and the electric device 200.
Optionally, the power supply system 900 further comprises a transmission line 902.
By adopting the power supply system 900 provided by the embodiment of the application, the power supply 901 is connected with the electric equipment 200 through the transmission line 902, and the power supply 901 can transmit electric energy to the electric equipment through the transmission line 902 to supply power to the electric equipment 200.
It should be understood that, because the three filter circuits in the electric equipment 200 perform filtering processing on interference noise carried in the electric energy output by the power supply, the influence of electromagnetic waves generated by the interference noise on electric equipment in the electric equipment 200 is weakened, and the EMC test result of the power supply 901 is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (11)
1. An electrical device, wherein the electrical device is connected to a power source, the electrical device comprising: the filter circuit comprises a first filter circuit, a second filter circuit, a third filter circuit and a load;
the first end of the first filter circuit is connected with the input end of the electric equipment, the second end of the first filter circuit is grounded, and the first filter circuit is used for receiving electric energy output by the power supply through the input end of the electric equipment and filtering the received electric energy;
the first end of the second filter circuit is connected with the first end of the first filter circuit, the second end of the second filter circuit is connected with the first end of the third filter circuit, and the second filter circuit is used for receiving the electric energy filtered by the first filter circuit and filtering the received electric energy;
the first end of the third filter circuit is connected with the load, the second end of the third filter circuit is grounded, and the third filter circuit is used for receiving the electric energy filtered by the second filter circuit, filtering the received electric energy, outputting the filtered electric energy to the load and supplying power to the load.
2. The consumer of claim 1, wherein the first filter circuit comprises at least one first filter capacitor;
the first end of each first filter capacitor is connected with the first end point of the input end of the electric equipment, and the second end of each first filter capacitor is grounded;
and a first end point of the input end of the electric equipment is used for being connected with the positive pole of the power supply, and a second end point of the input end of the electric equipment is used for being connected with the negative pole of the power supply.
3. The electric device according to claim 2, wherein if the first filter circuit comprises a plurality of first filter capacitors, the capacitance values of the plurality of first filter capacitors are different.
4. The electric equipment according to claim 3, wherein the first target filter capacitor is a filter capacitor with a smallest capacitance value among the plurality of first filter capacitors, the remaining first filter capacitors are filter capacitors except the first target filter capacitor among the plurality of first filter capacitors, each of the remaining first filter capacitors has a capacitance value N times that of the first target filter capacitor, and N is a natural number divisible by ten.
5. The powered device of claim 1, wherein the second filter circuit comprises at least one magnetic bead;
the first end of each magnetic bead is connected with the first end of the first filter capacitor, and the second end of each magnetic bead is connected with the first end of the third filter circuit.
6. The powered device of claim 5, wherein a maximum current allowed to pass by a magnetic bead in the second filter circuit is greater than or equal to an operating current value of the power source.
7. The consumer of claim 1, wherein the third filter circuit comprises at least one second filter capacitor;
the first end of each second filter capacitor is connected with the second end of the second filter circuit, and the second end of each second filter capacitor is grounded.
8. The electric device according to claim 7, wherein if the third filter circuit includes a plurality of second filter capacitors, the capacitance values of the plurality of second filter capacitors are different.
9. The electric device according to claim 8, wherein the second target filter capacitor is a filter capacitor having a smallest capacitance value among the plurality of second filter capacitors, the remaining second filter capacitors are filter capacitors except the second target filter capacitor among the plurality of second filter capacitors, and each of the remaining second filter capacitors has a capacitance value J times the second target filter capacitor, where J is a natural number divided by ten.
10. The powered device of claim 1, further comprising a voltage conversion circuit connected between the load and the first end of the third filter circuit;
the voltage conversion circuit is used for performing voltage conversion on the electric energy subjected to filtering processing by the third filter circuit and outputting the electric energy subjected to voltage conversion to the load.
11. A power supply system, characterized in that the power supply system comprises: a power source and the powered device of any one of claims 1-10;
the power supply is connected with the electric equipment and is used for supplying power to the electric equipment.
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| CN202111588057.4A CN114257079A (en) | 2021-12-23 | 2021-12-23 | Power utilization equipment and power supply system |
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