CN219576863U

CN219576863U - Filter circuit, filter, power supply circuit and electronic equipment

Info

Publication number: CN219576863U
Application number: CN202320234728.5U
Authority: CN
Inventors: 徐跃迅; 王庆丰; 仇彭成
Original assignee: Huichuan New Energy Vehicle Technology Shenzhen Co ltd
Current assignee: Huichuan New Energy Vehicle Technology Shenzhen Co ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-08-22
Anticipated expiration: 2033-02-06

Abstract

The utility model discloses a filter circuit, a filter, a power supply circuit and electronic equipment, wherein the filter circuit comprises: the input interface unit comprises a plurality of power input ends and is used for being connected with a power supply; the phase-cutting unit comprises at least two phase-cutting input ends, and the two phase-cutting input ends are respectively connected with the two power input ends in a one-to-one correspondence manner; the filtering unit comprises a plurality of filtering input ends, wherein one filtering input end is connected with the output end of the phase-cut unit, and the filtering unit is used for filtering the accessed power supply and outputting the power supply; the phase-cutting unit can control any one of the two power input ends to be connected with the filtering unit so that the filtering unit and the connected power supply form a filtering loop, wherein the two power input ends are respectively connected with the two phase-cutting input ends in a one-to-one correspondence manner. The utility model can solve the problem of low power density of the filter compatible with single and multi-phase inputs.

Description

Filter circuit, filter, power supply circuit and electronic equipment

Technical Field

The present utility model relates to the field of power supply products, and in particular, to a filter circuit, a filter, a power supply circuit, and an electronic device.

Background

Switching power supplies are generally compatible with single-phase and multi-phase inputs, and EMI filtering is typically required before the power supply is input to the switching power supply. In the existing filtering scheme, in order to match the single-phase and multi-phase inputs of the switching power supply, a plurality of filtering devices are generally integrated in the filtering unit, so that the filtering unit can filter the connected single-phase power supply or multi-phase power supply and output the filtered single-phase power supply or multi-phase power supply. However, in order to meet the requirement of compatibility of single-phase and multi-phase input, the conventional filtering scheme designs a large number of filtering devices, so that the size of the filter is larger, the power density of the filter is reduced, and meanwhile, the filtering capability is weak and the design requirement on a main power switch circuit is high under the same size.

Disclosure of Invention

The utility model mainly aims to provide a filter circuit which aims to solve the problem of low power density of a filter compatible with single-phase and multi-phase input.

In order to achieve the above object, the present utility model provides a filter circuit, comprising:

the input interface unit comprises a plurality of power input ends and is used for being connected with a power supply;

the phase-cutting unit comprises at least two phase-cutting input ends, and the two phase-cutting input ends are respectively connected with the two power input ends in a one-to-one correspondence manner;

the filtering unit comprises a plurality of filtering input ends, wherein one filtering input end is connected with the output end of the phase-cut unit, and the filtering unit is used for filtering the accessed power supply and outputting the power supply;

the phase-cutting unit can control any one of the two power input ends to be connected with the filtering unit so that the filtering unit and the connected power supply form a filtering loop, wherein the two power input ends are respectively connected with the two phase-cutting input ends in a one-to-one correspondence manner.

Optionally, the filtering circuit further includes:

the control unit is used for outputting a corresponding phase-cutting control signal to the phase-cutting unit when receiving the phase-cutting signal, so as to instruct the phase-cutting unit to control any one of the two power input ends to be connected with the filtering unit according to the phase-cutting control signal, wherein the two power input ends are respectively connected with the two phase-cutting input ends in a one-to-one correspondence manner.

Optionally, the filtering circuit further includes:

the detection end of the electric signal detection unit is connected with at least one of the two power input ends, the output end of the electric signal detection unit is connected with the receiving end of the control unit, the electric signal detection unit is used for detecting an input electric signal of the power input end and outputting a corresponding phase-cutting signal to the control unit according to a detection result so as to instruct the control unit to output the corresponding phase-cutting control signal to the phase-cutting unit according to the phase-cutting signal.

Optionally, the filtering unit includes at least a first filtering branch and a second filtering branch, the first filtering branch is connected with a first power input end of the input interface unit, the first power input end is different from two power input ends respectively connected with two phase-cutting input ends in a one-to-one correspondence manner, and the second filtering branch is connected with an output end of the phase-cutting unit.

Optionally, the second filtering branch includes at least a third inductor, a fourth inductor, a third capacitor and a fourth capacitor, where a first end of the third inductor is connected to the output end of the phase-cutting unit, a second end of the third inductor is connected to a first end of the fourth inductor, a first end of the third capacitor is connected to a connection intersection point between the third inductor and the fourth inductor, a second end of the third capacitor is grounded, a first end of the fourth capacitor is connected to a second end of the fourth inductor, and a second end of the fourth capacitor is grounded.

Optionally, the first filtering branch circuit at least includes a first inductor, a second inductor, a first capacitor and a second capacitor, a first end of the first inductor is connected to the first power input end, a second end of the first inductor is connected to a first end of the second inductor, a first end of the first capacitor is connected to a connection intersection point between the first inductor and the second inductor, a second end of the first capacitor is grounded, a first end of the second capacitor is connected to a second end of the second inductor, and a second end of the second capacitor is grounded.

Optionally, the filter unit further includes at least a fifth capacitor and a sixth capacitor, two ends of the fifth capacitor are respectively connected to the first end of the first inductor and the first end of the third inductor, and two ends of the sixth capacitor are respectively connected to the first end of the second inductor and the first end of the fourth inductor.

Optionally, the phase-cutting unit is a selection switch, the selection switch at least includes two selection ends, two selection ends are used as the phase-cutting input ends and are respectively connected with two power input ends in a one-to-one correspondence manner, the selection switch at least includes a public end, and the public end is used as the output end of the phase-cutting unit and is connected with one of the filtering input ends of the filtering unit.

The utility model also provides a filter, which comprises the filter circuit.

The utility model also provides a power supply circuit which comprises the filter circuit.

The utility model also provides electronic equipment, which comprises a switching power supply and the filter; or alternatively, the process may be performed,

comprising the power supply circuit.

According to the utility model, by arranging the input interface unit, the phase-cut unit and the filtering unit, the phase-cut unit can control one of at least two power input ends to be electrically connected with the filtering unit, so that compared with the mode that a filtering device is required to be added on a wire corresponding to each power input end for filtering in the prior art, the utility model only needs to select one of the two power input ends to be connected with the filtering unit for filtering, and the filtering device is not required to be independently added on the wire corresponding to each power input end for filtering, so that the number of the filtering devices is reduced by the filtering unit in the utility model, the wiring design of a filtering PCB is optimized, the overall size of the filter is reduced, the volume required by EMC filtering is reduced, the production cost of the filter is reduced, and the power density and the practicability of the filter are improved. The utility model can also be applied to single-phase input electronic equipment, so that the original electronic equipment can also work by using a double-phase power supply in a compatible way, thereby improving the power of the electronic equipment.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art filter circuit;

FIG. 2 is a schematic diagram of a functional module of an embodiment of a filter circuit according to the present utility model;

FIG. 3 is a schematic diagram of a functional module of another embodiment of the filtering circuit of the present utility model;

fig. 4 is a schematic circuit diagram of a filtering circuit according to an embodiment of the utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Input interface unit	N	Zero line input end
20	Phase cutting unit	PE	Ground terminal
				30	Filtering unit	L1～L4	First to fourth inductors
40	Voltage detection control unit	C1～C6	First to sixth capacitors
				P1、P2	Phase line input end

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Currently, in the existing filtering scheme, in order to match the single-phase and double-phase input of the switching power supply, a plurality of filtering devices are generally integrated in the filtering unit, so that the filtering unit can filter the connected single-phase power supply or double-phase power supply and output the filtered single-phase or double-phase power supply. The circuit structure of the conventional filtering unit compatible with single-dual phase input is shown in fig. 1, fig. 1 is a schematic circuit structure diagram of the filtering unit compatible with single-dual phase input in the prior art, and as shown in fig. 1, the filtering unit has the following problems: a filter device is added on a corresponding lead of each power input end for filtering, namely three windings are needed for the common-mode inductor of each stage of filtering, and the size of the inductor is larger under the requirement of the same inductance; and each stage of filtering needs two differential mode capacitors, more capacitor devices and difficult filtering wiring; three common-mode capacitors are needed for each stage of filtering, the number of filtering devices is large, the single-stage capacitance is low, and the contact current needs to be controlled; the filtering capability is weak and the design requirement on the main power switch circuit is high under the same size.

In order to solve the above-mentioned problems, the present utility model provides a filter circuit, referring to fig. 1 to 4, in an embodiment, the filter circuit includes:

the input interface unit 10, the input interface unit 10 includes a plurality of power input terminals, the input interface unit 10 is used for switching on the power;

the phase-cutting unit 20, the phase-cutting unit 20 comprises at least two phase-cutting input ends, and the two phase-cutting input ends are respectively connected with the two power input ends in a one-to-one correspondence manner;

the filtering unit 30, the filtering unit 30 includes a plurality of filtering input ends, one of which is connected with the output end of the phase-cut unit 20, the filtering unit 30 is used for filtering the connected power supply and outputting;

the phase-cutting unit 20 can control any one of two power input ends to be connected with the filtering unit 30, so that the filtering unit 30 and an accessed power supply form a filtering loop, wherein the two power input ends are respectively connected with the two phase-cutting input ends in a one-to-one correspondence manner.

In this embodiment, the input interface unit 10 has a phase input terminal P1, a phase input terminal P2, and a neutral input terminal N for connecting a first live wire, a second live wire, and a neutral wire, respectively. When the input interface unit 10 is connected to the single-phase power supply, the phase line input end P1 and the neutral line input end N of the input interface unit 10 are respectively connected with the first live line and the neutral line in the single-phase power supply in a one-to-one correspondence manner. When the input interface unit 10 is connected to the dual-phase power supply, the phase line input end P1 and the phase line input end P2 of the input interface unit 10 are respectively connected with the first live wire and the second live wire in the dual-phase power supply in a one-to-one correspondence manner.

The switching circuit with a relay, a single-pole double-throw switch, a single-pole triple-throw switch and other switches can be selected for the phase-cutting unit 20 to realize the switching of the power input end, and since the phase-cutting unit 20 is arranged between the input interface unit and the filtering unit and the phase-cutting unit 20 can realize the switching of the power input end, the filtering unit 30 in this embodiment can be realized by a single-phase filtering circuit, at least two phase-cutting input ends of the phase-cutting unit 20 are respectively connected with the phase line input end P2 and the zero line input end N in a one-to-one correspondence manner, the first input end of the filtering unit 30 is connected with the phase line input end P1 of the input interface unit 10, and the second input end of the filtering unit 30 is connected with the output end of the phase-cutting unit 20. So set up, when single-phase power is inputed, phase cut unit 20 control zero line input N is connected with the second input of filter unit 30 for filter unit 30's first input access first live wire, filter unit 30's second input access zero line, thereby make filter unit 30 carry out filtering process to single-phase power. When the dual-phase power supply is input, the phase-cut unit 20 controls the phase line input end P2 to be connected with the filtering unit 30, so that the first input end of the filtering unit 30 is connected with the first live wire, and the second input end of the filtering unit 30 is connected with the second live wire, and the filtering unit 30 performs filtering processing on the dual-phase input power supply. Therefore, by arranging the phase-cut unit 20, the power supply connected to the second input end of the filter unit 30 can be changed, so that the phase-cut input of the input power supply is realized, and compared with the prior art that the filter devices are required to be added on the corresponding leads of each power supply input end for filtering, namely, the filter unit in the prior art adopts a two-phase filter circuit, the filter unit 30 in the utility model can realize the filter functions of single-phase power supply input and two-phase power supply input in a compatible way only by adopting the single-phase filter circuit, thereby greatly reducing the number of filter devices in the filter unit 30, reducing the size of the filter and improving the power density.

It will be appreciated that the phase-cut unit 20 may be implemented by a manually controlled mechanical switch, so that the user may manually switch the power input filtering mode depending on the power being switched on. Or, an electrical signal detection unit and a controller may be additionally arranged in the filtering circuit, the electrical signal detection unit is used to detect the voltage of the phase line input end P2 and/or the zero line input end N, that is, when the electrical signal detection unit detects that the voltage of the phase line input end P2 is greater than zero, the electrical signal detection unit is used to input a dual-phase power supply, the controller controls the phase switching unit 20 to switch to the power supply access filtering unit 30 of the phase line input end P2, otherwise, the controller controls the phase switching unit 20 to switch to the power supply access filtering unit 30 of the zero line input end N, and the electrical signal detection unit and the controller are used to realize automatic switching of the power supply input filtering mode.

According to the utility model, by arranging the input interface unit 10, the phase-cutting unit 20 and the filtering unit 30, when the phase-cutting unit 20 controls the phase line input end P2 to be electrically connected with the filtering unit 30, the filtering unit 30 can filter the connected two-phase input power supply, and when the phase-cutting unit 20 controls the zero line input end N to be electrically connected with the filtering unit 30, the filtering unit 30 can filter the connected single-phase input power supply, so that a user can switch the power input modes by controlling the phase-cutting unit 20, and the power connected to the power input end corresponding to each power input mode is independently filtered by the filtering unit 30, and the filtering function of single-phase power supply input and two-phase power supply input can be compatible by the single-phase filtering unit 30 without arranging a filtering device on a wire corresponding to each power input end. According to the utility model, the phase-cut unit 20 is arranged, so that the filtering unit 30 can select the single-phase filtering unit 30 to realize the filtering treatment of the dual-phase power supply, therefore, the number of filtering devices is greatly reduced by the filtering unit 30, the wiring design of a filtering PCB is optimized, the size of the filter is reduced, the volume required by EMC filtering is reduced, the production cost of the filter is reduced, and the power density and the practicability of the filter are improved. The utility model can also be applied to single-phase input electronic equipment, so that the original electronic equipment can also work by using a double-phase power supply in a compatible way, thereby improving the power of the electronic equipment.

In another embodiment, the input interface unit 10 may include more than three input interfaces, for example, the input interface unit 10 has a phase line input end P1, a phase line input end P2, a phase line input end P3, and a zero line input end N, the phase-cutting unit 20 has three phase-cutting input ends and two output ends, the three phase-cutting input ends are respectively connected with the phase line input end P2, the phase line input end P3, and the zero line input end N in a one-to-one correspondence manner, the two output ends are respectively connected with two input ends of the filtering unit 30, and thus, when the single-phase power is input, the phase-cutting unit 20 controls the zero line input end N to be connected with one input end of the filtering unit 30, and when the three-phase power is input, the phase-cutting unit 20 controls the phase line input end P2 and the phase line input end P3 to be respectively connected with the two input ends of the filtering unit 30, so that the filtering unit 30 can select the two-phase filtering unit 30 to implement the filtering treatment of the three-phase power. Alternatively, the phase-cutting unit 20 may select a switching circuit having a switch such as a double pole double throw switch to implement switching of the power input terminal.

Referring to fig. 1 to 4, in an embodiment, the filter circuit further includes:

the control unit, the control end of the control unit is connected with the controlled end of the phase-cutting unit 20, and the control unit is used for outputting a corresponding phase-cutting control signal to the phase-cutting unit 20 when receiving the phase-cutting signal, so as to instruct the phase-cutting unit 20 to control any one of two power input ends to be connected with the filtering unit 30 according to the phase-cutting control signal, wherein the two power input ends are respectively connected with the two phase-cutting input ends in a one-to-one correspondence manner.

In an embodiment, the control unit may be implemented by using a CPLD, an MCU, an FPGA, or other microprocessors, and the control unit may output a corresponding phase-cutting control signal to the phase-cutting unit 20 when receiving a phase-cutting signal issued by a user or other modules, so as to control the phase-cutting unit 20 to perform phase cutting, where the phase-cutting signal may be issued by the user through an additionally provided input component such as a button or a touch screen, or may be issued by an additionally provided electrical signal detection unit and a comparison circuit, and after voltage detection, when an input voltage of the phase line input terminal P2 is greater than a preset voltage threshold, the phase-cutting signal is output by the comparison circuit. The arrangement is such that the control unit can output a corresponding phase-cut control signal to the phase-cut unit 20 according to the received phase-cut signal, so that the phase-cut unit 20 controls the corresponding power input to be connected to the filtering unit according to the phase-cut signal, and the filtering unit 30 filters the connected single-phase power supply or the two-phase power supply.

Optionally, the filtering circuit further comprises:

the detection end of the electric signal detection unit is connected with at least one of the two power input ends, the output end of the electric signal detection unit is connected with the receiving end of the control unit, and the electric signal detection unit is used for detecting an input electric signal of the power input end and outputting a corresponding phase-cutting signal to the control unit according to the detection result so as to instruct the control unit to output a corresponding phase-cutting control signal to the phase-cutting unit 20 according to the phase-cutting signal.

In this embodiment, the electrical signal detecting unit may select a voltage sensor or a voltage dividing resistor connected in series to obtain the input voltage data of the power input end connected to the input end of the phase-cutting unit 20 in a one-to-one correspondence manner, and output the input voltage data to the control unit. The control unit can judge whether the connected power supply is single-phase power supply input or double-phase power supply input according to the voltage detection signal output by the electric signal detection unit, for example, the electric signal detection unit can acquire input voltage data of the phase line input end P2, or acquire input voltage data of the zero line input end N, or acquire input voltage data of the phase line input end P2 and the zero line input end N at the same time, and judge whether the connected power supply is single-phase power supply input or double-phase power supply input. When the accessed power is input by the single-phase power, the control unit controls the zero line input end N to be connected with the second input end of the filtering unit 30, so that the filtering unit 30 performs filtering processing on the accessed single-phase power. When the connected power is input by the dual-phase power, the control unit controls the phase line input terminal P2 to be connected with the second input terminal of the filtering unit 30, so that the filtering unit 30 performs filtering processing on the connected dual-phase power. The utility model can identify the type of the connected power supply and automatically switch to the corresponding filtering mode by arranging the voltage detection control unit 40, thereby realizing the single-double-phase compatible filtering function and improving the intellectualization and practicability of the filtering unit 30.

Referring to fig. 1 to 4, in an embodiment, the filtering unit 30 includes at least a first filtering branch and a second filtering branch, the first filtering branch is connected to a first power input terminal of the input interface unit, the first power input terminal is different from two power input terminals respectively connected to two phase-cut input terminals in one-to-one correspondence, and the second filtering branch is connected to an output terminal of the phase-cut unit 20.

Optionally, the second filtering branch includes at least a third inductor L3, a fourth inductor L4, a third capacitor C3 and a fourth capacitor C4, where a first end of the third inductor L3 is connected to the output end of the phase-cutting unit 20, a second end of the third inductor L3 is connected to a first end of the fourth inductor L4, a first end of the third capacitor C3 is connected to a connection intersection point between the third inductor L3 and the fourth inductor L4, a second end of the third capacitor C3 is grounded, a first end of the fourth capacitor C4 is connected to a second end of the fourth inductor L4, and a second end of the fourth capacitor C4 is grounded.

The first filtering branch circuit at least comprises a first inductor L1, a second inductor L2, a first capacitor C1 and a second capacitor C2, wherein a first end of the first inductor L1 is connected to a first power input end, a second end of the first inductor L1 is connected to a first end of the second inductor L2, a first end of the first capacitor C1 is connected to a connection intersection point between the first inductor L1 and the second inductor L2, a second end of the first capacitor C1 is grounded, a first end of the second capacitor C2 is connected to a second end of the second inductor L2, and a second end of the second capacitor C2 is grounded.

The filter unit further comprises a fifth capacitor C5 and a sixth capacitor C6, wherein two ends of the fifth capacitor C5 are respectively connected to the first end of the first inductor L1 and the first end of the third inductor L3, and two ends of the sixth capacitor C6 are respectively connected to the first end of the second inductor L2 and the first end of the fourth inductor L4.

Referring to fig. 4, fig. 4 is a schematic circuit diagram of an embodiment of the filtering unit 30, in which the filtering unit 30 is composed of a multi-stage single-phase filtering unit 30, wherein the fifth capacitor C5 and the sixth capacitor C6 are differential mode capacitors, the first inductor L1 and the third inductor L3, and the second inductor L2 and the fourth inductor L4 are two sets of common mode inductors, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are common mode capacitors, and the ground terminal PE of the input interface unit 10 corresponds to the ground in the dual-phase power supply. It can be understood that, in order to meet the national security requirement, since the differential mode capacitance in the filtering unit 30 is reduced from two in the prior art to one, a capacitance with a larger withstand voltage value needs to be selected as the differential mode capacitance in the present utility model, so as to prevent the differential mode capacitance from being damaged due to the power input. The number of stages of the single-phase filtering unit 30 can be set according to practical application requirements so as to meet the application requirements of different products and meet national security standards. It should be noted that, compared with the two-phase filtering unit 30 in the prior art for compatibility of single-phase input and two-phase input, the single-phase filtering unit 30 in this embodiment reduces the number of common-mode inductances, differential-mode capacitances and common-mode capacitances, that is, the number of filtering devices, optimizes the routing design of the filtering PCB, and reduces the size of the filter, thereby reducing the volume required by EMC filtering, reducing the production cost of the filter, and improving the power density and practicality of the filter.

In an embodiment, the phase-cutting unit 20 is a selection switch, and the selection switch includes at least two selection terminals, the two selection terminals are used as phase-cutting input terminals and are respectively connected with the two power input terminals in a one-to-one correspondence manner, and the selection switch includes at least one common terminal, and the common terminal is used as an output terminal of the phase-cutting unit and is connected with one of the filtering input terminals of the filtering unit 30.

In one embodiment, the phase-cutting unit 20 is a relay, two moving contacts of the relay are respectively connected to the neutral input terminal N and the phase input terminal P2 of the input interface unit 10, and a stationary contact of the relay is connected to the second input terminal of the filtering unit 30. So configured, when the relay is not energized, the relay control neutral line input N communicates with the second input of the filter unit 30 in a single phase power input filter mode. When the relay is electrically connected, the phase line input terminal P2 is controlled to be connected to the second input terminal of the filtering unit 30, and the two-phase power supply is input into the filtering mode. Similarly, the phase-cutting unit 20 may be other electronic switches, and is controlled by a controller, so as to realize selective communication of corresponding input ends.

In another embodiment, the phase-cutting unit 20 is a mechanical switch, such as a single pole double throw switch, so that a user can manually control the phase-cutting unit 20 to control any one of the neutral input terminal N and the phase input terminal P2 of the input interface unit 10 to be electrically connected with the filtering unit 30 according to the type of the connected power source, so as to implement manual power input filtering switching, thereby enabling the filtering unit 30 to filter the connected power source.

The utility model also provides a filter, which comprises the filter circuit, and the specific structure of the filter circuit refers to the embodiment, and because the filter adopts all the technical schemes of all the embodiments, the filter at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here.

The utility model also provides a power supply circuit, which comprises the filter circuit, and the specific structure of the filter circuit refers to the embodiment, and because the filter adopts all the technical schemes of all the embodiments, the filter has at least all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here.

The utility model also provides electronic equipment which comprises a switching power supply and the filter; or the power supply circuit is included, the electronic device may be a device such as an automobile charging gun or an automobile charger, and the specific structure of the filter and the power supply circuit refers to the above embodiments.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A filter circuit, comprising:

2. The filter circuit of claim 1, wherein the filter circuit further comprises:

3. The filter circuit of claim 2, wherein the filter circuit further comprises:

4. The filter circuit of claim 1, wherein the filter unit includes at least a first filter branch and a second filter branch, the first filter branch is connected to a first power input terminal of the input interface unit, the first power input terminal is different from two power input terminals respectively connected to two phase-cut input terminals in one-to-one correspondence, and the second filter branch is connected to an output terminal of the phase-cut unit.

5. The filter circuit of claim 4, wherein the second filter branch comprises at least a third inductor, a fourth inductor, a third capacitor and a fourth capacitor, a first end of the third inductor is connected to the output end of the phase-cut unit, a second end of the third inductor is connected to the first end of the fourth inductor, a first end of the third capacitor is connected to a connection intersection point between the third inductor and the fourth inductor, a second end of the third capacitor is grounded, a first end of the fourth capacitor is connected to the second end of the fourth inductor, and a second end of the fourth capacitor is grounded.

6. The filter circuit of claim 5, wherein the first filter branch comprises at least a first inductor, a second inductor, a first capacitor, and a second capacitor, a first end of the first inductor is connected to the first power input terminal, a second end of the first inductor is connected to a first end of the second inductor, a first end of the first capacitor is connected to a connection intersection between the first inductor and the second inductor, a second end of the first capacitor is grounded, a first end of the second capacitor is connected to a second end of the second inductor, and a second end of the second capacitor is grounded.

7. The filter circuit of claim 6, wherein the filter unit further comprises a fifth capacitor and a sixth capacitor, both ends of the fifth capacitor are respectively connected to the first end of the first inductor and the first end of the third inductor, and both ends of the sixth capacitor are respectively connected to the first end of the second inductor and the first end of the fourth inductor.

8. The filter circuit according to any one of claims 1-7, wherein the phase-cut unit is a selection switch, the selection switch comprises at least two selection terminals, the two selection terminals are used as the phase-cut input terminals and are respectively connected with the two power input terminals in a one-to-one correspondence manner, the selection switch comprises at least one common terminal, and the common terminal is used as an output terminal of the phase-cut unit and is connected with one of the filter input terminals of the filter unit.

9. A filter comprising a filter circuit as claimed in any one of claims 1 to 8.

10. A power supply circuit comprising a filter circuit as claimed in any one of claims 1 to 8.

11. An electronic device comprising the filter of claim 9; or alternatively, the process may be performed,

comprising the power supply circuit of claim 10.