Filter circuit, circuit board and clothes processing equipment

Abstract

The utility model provides a filter circuit, a circuit board and clothes processing equipment, a filter capacitor in the filter circuit is used for being connected between a first power supply line and a second power supply line, and is used for charging under the condition that a voltage difference exists between the first power supply line and the second power supply line; the discharge device and the filter capacitor are arranged in parallel, and the discharge device is configured to enable the filter capacitor to discharge to the discharge device under the condition that the discharge device is connected with the filter capacitor; the control unit is used for cutting off the connection between the discharger and the filter capacitor during power input and conducting the connection between the discharger and the filter capacitor during power failure; the discharge device is connected to the filter capacitor only when the power is cut off, the filter capacitor is discharged, the situation that the discharge device discharges in the energy charging process of the filter capacitor is avoided, and the power consumption of the filter circuit is reduced; and moreover, the filter capacitor can be discharged in time during power failure, so that the risk of electric shock is reduced, and the safety of the filter circuit and the application equipment thereof is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of load driving, and particularly relates to a filter circuit, a circuit board and a clothes processing device. BACKGROUND

[0002] In a circuit for driving a load to work, a filter circuit is usually arranged to filter out interference signals. In particular, in an alternating current power supply circuit, a differential mode capacitor is arranged to filter out differential mode signals between a live wire and a neutral wire.

[0003] In the related art, a resistor is also arranged to discharge the differential mode capacitor in a specific case. However, the pure resistor discharge structure will continuously discharge the differential mode capacitor for a long time without control, which will increase the power consumption of the filter circuit. SUMMARY

[0004] The present application aims to provide a filter circuit, a circuit board and a clothes processing device, and aims to solve the problem of high power consumption of the filter circuit in the prior art.

[0005] A first aspect of the embodiments of the present application provides a filter circuit, which comprises:

[0006] a filter capacitor, which is connected between a first power supply line and a second power supply line, and is configured to be charged in the case of a voltage difference between the first power supply line and the second power supply line;

[0007] a discharge device, which is arranged in parallel with the filter capacitor, and is configured to be discharged by the filter capacitor in the case of being connected to the filter capacitor;

[0008] a control unit, which is configured to disconnect the discharge device and the filter capacitor in the case of the first power supply line and the second power supply line being connected to electric energy, and is configured to connect the discharge device and the filter capacitor in the case of the first power supply line and the second power supply line being disconnected from electric energy.

[0009] In some embodiments of the present application, the first power supply line is a live wire, the second power supply line is a neutral wire, and the discharge device and at least part of the control unit are connected in series between the first power supply line and the second power supply line.

[0010] In some embodiments of the present application, the control unit comprises a switch, which is connected in series with the discharge device, and is configured to be disconnected in the case of the first power supply line and the second power supply line being connected to electric energy, and is configured to be connected in the case of the first power supply line and the second power supply line being disconnected from electric energy.

[0011] In some embodiments of the present application, the control unit further comprises a control chip, the switch element comprises a first end and a second end, the first end is connected to the discharging device, and the second end is connected to the control chip.

[0012] The control chip is configured to output a control signal according to whether the first power supply line and the second power supply line are connected to power, and the switch element is configured to turn off or turn on the first end and the second end according to the control signal.

[0013] In some embodiments of the present application, a voltage dividing resistor is arranged between the first end of the switch element and the control end, and one end of the discharging device away from the power supply line is connected to a connection line between the first end and the voltage dividing resistor.

[0014] In some embodiments of the present application, the number of switch elements is at least two, and the two switch elements are arranged on two sides of the control chip, and the number of discharging devices is at least two.

[0015] One end of one of the at least two discharging devices is connected to one of the two switch elements, and the other end is connected to the first power supply line; one end of the other of the at least two discharging devices is connected to the other of the two switch elements, and the other end is connected to the second power supply line.

[0016] In some embodiments of the present application, the switch element is at least one of a MOS tube and a triode.

[0017] In some embodiments of the present application, the discharging device is a discharging resistor.

[0018] The second aspect of the embodiments of the present application further provides a circuit board, and the filter circuit as described above is integrated on the circuit board.

[0019] The third aspect of the embodiments of the present application further provides a clothes treatment apparatus, and the clothes treatment apparatus comprises the circuit board as described above.

[0020] The beneficial effects of the present application are that: in the filter circuit, the circuit board and the clothes processing equipment, the filter circuit comprises a filter capacitor, a discharge device and a control unit; the filter capacitor is connected between the first power supply line and the second power supply line, and is used to charge in the case of a voltage difference between the first power supply line and the second power supply line; the discharge device is connected in parallel with the filter capacitor, and the discharge device is configured to discharge the filter capacitor when connected to the filter capacitor; the control unit is used to disconnect the connection between the discharge device and the filter capacitor when the first power supply line and the second power supply line are connected to electrical energy, and is used to connect the connection between the discharge device and the filter capacitor when the first power supply line and the second power supply line are disconnected from electrical energy; in the present application, the control unit is used to control the connection between the filter capacitor and the discharge device, and the discharge device is connected to the filter capacitor only when the power is off, and the filter capacitor is discharged, which is beneficial to avoid the discharge of the discharge device during the charging of the filter capacitor, thereby reducing the power consumption of the filter circuit; and the filter capacitor can be discharged in time when the power is off, so as to reduce the risk of electric shock and improve the safety of the filter circuit and the application equipment thereof. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The frame structure schematic diagram of the filter circuit provided by an embodiment of the present application is shown in the figure.

[0022] Figure 2 The frame structure schematic diagram of the filter circuit provided by another embodiment of the present application is shown in the figure.

[0023] Figure 3 The frame structure schematic diagram of the filter circuit provided by another embodiment of the present application is shown in the figure.

[0024] Figure 4 The frame structure schematic diagram of the filter circuit provided by another embodiment of the present application is shown in the figure.

[0025] Figure 5 The frame structure schematic diagram of the filter circuit provided by another embodiment of the present application is shown in the figure.

[0026] Figure 6 The circuit structure schematic diagram of the filter circuit provided by an embodiment of the present application is shown in the figure.

[0027] Specific element symbol explanation: 100-first power supply line, 200-second power supply line, 300-filter capacitor, 400-discharge device, 500-control unit, 510-switching element, 520-control chip, R1-voltage dividing resistor, R2-discharge resistor. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, further detailed descriptions will be given below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0029] It should be noted that when an element is referred to as being "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] In addition, the terms "first", "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] It should be noted that in modern electronic devices, the filter circuit is an important structure to ensure the quality of the power supply and the stability of the device. Especially in the circuit powered by alternating current, the existence of interference signals can have a serious impact on the normal operation of the device. The filter circuit is mainly used to suppress noise and interference signals in the power supply to ensure that the load device can obtain stable power supply. In particular, in the alternating current power supply system, there may be differential mode signals between the live wire and the neutral wire, and these signals will cause the device to malfunction, performance degradation, and even damage if not filtered out.

[0032] Currently, a differential mode capacitor is generally used as a filter element, which can effectively suppress these interference signals and improve the quality of the power supply. The differential mode capacitor is usually connected between the live wire and the neutral wire, and the interference signals are short-circuited to the ground to reduce the noise level in the power supply. However, the differential mode capacitor stores a certain amount of electrical energy during operation, and if it is not discharged in time when the power supply is powered off or switched, not only will it increase the power consumption of the filter circuit, but it may also affect the subsequent circuit, thereby causing the risk of electric shock.

[0033] In related technologies, a discharge resistor is generally provided to discharge the differential mode capacitor. However, due to the presence of the discharge resistor, the differential mode capacitor will continue to discharge in the normal working state, which not only reduces the efficiency of the filter circuit, but also increases the overall power consumption. That is, long-term current through the discharge resistor will cause unnecessary power consumption, which will affect the energy efficiency and long-term stability of the device. And in some cases, the circuit may need to respond quickly, but due to the continuous discharge of the discharge resistor, the filter capacitor may not be able to charge quickly, thereby affecting the dynamic performance of the circuit.

[0034] Based on this, the traditional filter circuit, circuit board and clothes treatment equipment are improved.

[0035] Please refer to Figure 1 , Figure 1 The schematic diagram of the frame structure of the filter circuit provided in the embodiment is shown in the figure; the filter circuit of the embodiment includes a filter capacitor 300, a discharging device 400 and a control unit 500.

[0036] It should be explained that the filter capacitor 300 usually includes an X capacitor and a Y capacitor, the X capacitor is usually connected across the live line and the neutral line to filter out the differential mode signal, and the Y capacitor is usually connected across the AC input line L-PE (live line-protective earth) and N-PE (neutral line-protective earth) respectively to suppress the interference of common mode signal, when there is common mode interference in the circuit, the Y capacitor will bypass the interference signal to the ground wire, thereby reducing the influence of the interference on the circuit. The filter circuit with the core of the X capacitor is mainly improved in the application.

[0037] The filter capacitor 300 of the embodiment is used to be connected between the first power supply line 100 and the second power supply line 200, and the filter capacitor 300 is charged in the case that there is a voltage difference between the first power supply line 100 and the second power supply line 200; the discharging device 400 is connected in parallel with the filter capacitor 300, and the discharging device 400 is configured to discharge the filter capacitor 300 to the discharging device 400 in the case of being connected with the filter capacitor 300; the control unit 500 is used to disconnect the connection between the discharging device 400 and the filter capacitor 300 in the case that the first power supply line 100 and the second power supply line 200 are connected with electric energy, and is used to connect the discharging device 400 and the filter capacitor 300 in the case that the first power supply line 100 and the second power supply line 200 are disconnected with electric energy.

[0038] It can be understood that in the case that the first power supply line 100 and the second power supply line 200 are connected with electric energy, a voltage difference is formed between the first power supply line 100 and the second power supply line 200, so that the differential mode interference between the first power supply line 100 and the second power supply line 200 is filtered out by the filter capacitor 300 in the form of charging. But in the specific case that the first power supply line 100 and the second power supply line 200 are disconnected with electric energy, considering the safety of the user, the discharging device 400 is set to discharge the electric energy of the filter capacitor 300. In order to avoid the discharging device 400 continuing to discharge in other cases (connected with electric energy), which not only does not improve the safety, but also increases the power consumption of the filter circuit. In the embodiment, the control unit 500 is set to connect the discharging device 400 to the filter capacitor 300 to discharge only when the electric energy is disconnected (such as standby, equipment power-off, etc.), so as to ensure the safety of the user, and the connection between the discharging device 400 and the filter capacitor 300 is disconnected when the electric energy is connected, so as to save the power consumption.

[0039] In the related art, the discharging device 400 continuously discharges the filter capacitor 300, resulting in high power consumption of the filter circuit. However, in the present application, the control unit 500 is arranged to control the connection between the filter capacitor 300 and the discharging device 400, and the discharging device 400 is connected to the filter capacitor 300 only when the power is off to discharge the filter capacitor 300, which is beneficial to avoid the situation that the discharging device 400 discharges during the charging process of the filter capacitor 300, thereby reducing the power consumption of the filter circuit; and the filter capacitor 300 can be discharged in time when the power is off to reduce the risk of electric shock and improve the safety of the filter circuit and the application device thereof.

[0040] In some embodiments of the present application, please refer to Figure 2 , Figure 2 The frame structure schematic diagram of the filter circuit provided by the present embodiment is shown; the first power supply line 100 of the present embodiment is the live wire, the second power supply line 200 is the zero line, and the discharging device 400 and at least part of the control unit 500 are connected in series between the first power supply line 100 and the second power supply line 200.

[0041] It can be understood that there is a relatively large voltage difference between the live wire and the zero line, and if the discharging device 400 continuously discharges, it will also consume the power of the alternating current. The control unit 500 and the discharging device 400 in the present embodiment are connected in series between the live wire and the zero line, which not only can disconnect the discharging device 400 and the filter capacitor 300 under certain conditions to reduce the discharge of the filter capacitor 300, but also can disconnect the discharging device 400 and the alternating current to reduce the power loss of the alternating current.

[0042] In some embodiments, the first power supply line 100 and the second power supply line 200 can be any one of the different phase lines and the zero line in the three-phase power supply.

[0043] In some embodiments of the present application, please refer to Figure 3 , Figure 3 The frame structure schematic diagram of the filter circuit provided by the present embodiment is shown; the control unit 500 of the present embodiment includes a switching element 510, the switching element 510 is connected in series with the discharging device 400, and the switching element 510 is configured to be disconnected when the first power supply line 100 and the second power supply line 200 are connected to the power, and is configured to be conductive when the first power supply line 100 and the second power supply line 200 are disconnected from the power.

[0044] It can be understood that after the switching element 510 is conductive, the discharging device 400 is directly connected to the first power supply line 100 and the second power supply line 200, and the discharging device 400 and the filter capacitor 300 form a loop, thereby realizing the rapid discharge of the filter capacitor 300.

[0045] In some embodiments of the present application, please refer toFigure 4 , Figure 4 A schematic diagram of a framework structure of the filter circuit provided by the embodiment is shown; the control unit 500 of the embodiment further comprises a control chip 520, the switch element 510 comprises a first end and a second end, the first end is connected to the discharge device 400, and the second end is connected to the control chip 520; the control chip 520 is configured to output a control signal according to whether the first power supply line 100 and the second power supply line 200 are connected to electric energy, and the switch element 510 is configured to turn off or turn on the first end and the second end according to the control signal.

[0046] It can be understood that, when connected to electric energy, the switch element 510 disconnects the first end and the second end according to the control signal, at this time, the discharge device 400 does not discharge, and when the electric energy is disconnected, the discharge device 400 is directly connected to the control chip 520 to discharge the filter capacitor 300.

[0047] In some embodiments, please refer to Figure 5 , Figure 5 A schematic diagram of a framework structure of the filter circuit provided by the embodiment is shown; the control chip 520 of the embodiment directly connects the second end of the switch element 510 to the second power supply line 200, and the filter capacitor 300 and the switch element constitute a discharge loop.

[0048] In some embodiments of the present application, please refer to Figure 6 , Figure 6 A schematic diagram of a circuit structure of the filter circuit provided by the embodiment is shown; the first end and the control end of the switch element 510 are provided with a voltage dividing resistor R1, and one end of the discharge device 400 away from the power supply line is connected to a connecting line between the first end and the voltage dividing resistor R1.

[0049] It can be understood that the voltage dividing resistor R1 is configured to form a pressure difference between the first end and the control end of the switch element 510, so as to control the conduction of the switch element 510. And as Figure 6 shown, in the case of connecting to electric energy, the control end of at least one side of the switch element 510 will receive a high-level signal, if the switch element 510 is a PMOS tube, the PMOS tube can be ensured to be in a constant-off state in the case of connecting to electric energy, thereby being conducive to improving the switching stability of the switch element 510.

[0050] In some embodiments of the present application, please continue to refer to Figure 6 , Figure 6Q1 is the switch 510, control is the control chip 520, XCAP is the filter capacitor 300, and AC Input is one side of the power input. The number of the switch 510 in the embodiment is at least two, and the two switches 510 are arranged on the two sides of the control chip 520. The number of the discharge device 400 is at least two. One end of one of the at least two discharge devices 400 is connected to one of the two switches 510, and the other end is connected to the first power supply line 100. One end of the other of the at least two discharge devices 400 is connected to the other of the two switches 510, and the other end is connected to the second power supply line 200. In this way, the control stability of the discharge device 400 can be improved.

[0051] In some embodiments of the present application, please refer to Figure 6 , the switch 510 is at least one of a MOS tube and a triode. It can be understood that in Figure 6 the circuit diagram shown, if there is a power input, at least one MOS tube can be ensured to be in a constant-off state (as described in the above embodiment, which will not be repeated here), thereby facilitating the control stability of the discharge device 400.

[0052] In some embodiments, the MOS tube is a high-voltage vertical double-diffused metal oxide semiconductor field effect transistor (VDMOS tube). In this way, the withstand voltage capability of the switch 510 can be improved, and the stress of lightning and surges can be effectively tolerated.

[0053] In some embodiments of the present application, please refer to Figure 6 , the discharge device 400 is a discharge resistor R2.

[0054] In order to better implement the filter circuit in any of the above embodiments, on the basis of the above filter circuit, the present embodiment further provides a circuit board, and the above filter circuit is integrated on the circuit board.

[0055] In some embodiments, the circuit board further integrates a rectifier circuit, and the rectifier circuit is arranged between the filter circuit and the load.

[0056] In order to better implement the circuit board in any of the above embodiments, on the basis of the above circuit board, the present embodiment further provides a clothes treatment apparatus, and the clothes treatment apparatus comprises the above circuit board.

[0057] In some embodiments, the clothes treatment apparatus can be a cleaning apparatus or other household clothes treatment apparatus.

[0058] In some embodiments, the laundry treating apparatus is a washer-dryer, a dryer, or the like.

[0059] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0060] The above has described the basic concept, and it is obvious that the above detailed disclosure is only as an example for the person skilled in the art, and does not constitute a limitation on the present application. Although it is not explicitly stated here, the person skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0061] At the same time, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0062] Similarly, it should be noted that, in order to simplify the expression of the disclosure of the present application and to help understand one or more embodiments of the present application, sometimes multiple features are combined into one embodiment, figure or description thereof in the foregoing description of the embodiments of the present application. However, this disclosure method does not mean that the features required by the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the disclosed single embodiment.

[0063] The above described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A filter circuit of a laundry treating apparatus, characterized by, The filter circuit comprises: a filter capacitor connected between the first power supply line and the second power supply line, and configured to be charged when a voltage difference exists between the first power supply line and the second power supply line; a discharge device connected in parallel with the filter capacitor, and configured to be discharged by the filter capacitor when connected therewith; a control unit configured to disconnect the discharge device from the filter capacitor when the first power supply line and the second power supply line are connected to electrical energy, and configured to connect the discharge device to the filter capacitor when the first power supply line and the second power supply line are disconnected from electrical energy; the control unit comprises a switch connected in series with the discharge device; the control unit further comprises a control chip, the switch comprises a first end and a second end, the first end is connected to the discharge device, and the second end is connected to the control chip; the number of the switches is at least two, and the two switches are arranged on two sides of the control chip, and the number of the discharge devices is at least two; one end of one of the at least two discharge devices is connected to one of the two switches, and the other end is connected to the first power supply line; one end of the other of the at least two discharge devices is connected to the other of the two switches, and the other end is connected to the second power supply line. 2.The filtering circuit of a laundry treating apparatus according to claim 1, characterized in that, The first power supply line is a live wire, the second power supply line is a neutral wire, and the discharge device and at least part of the control unit are connected in series between the first power supply line and the second power supply line. 3.The filtering circuit of a laundry treating apparatus according to claim 2, characterized in that, The switch is configured to be disconnected when the first power supply line and the second power supply line are connected to electrical energy, and configured to be connected when the first power supply line and the second power supply line are disconnected from electrical energy. 4.The filtering circuit of a laundry treating apparatus according to claim 3, characterized in that, The control chip is configured to output a control signal according to whether the first power supply line and the second power supply line are connected to electrical energy, and the switch is configured to be turned off or turned on according to the control signal. 5.The filtering circuit of a laundry treating apparatus according to claim 4, characterized in that, A voltage dividing resistor is arranged between the first end of the switch and the control end, and one end of the discharge device, which is away from the power supply line, is connected to a connection line between the first end and the voltage dividing resistor.

6. The filter circuit of the laundry treating apparatus according to any one of claims 3 to 5, characterized in that, The switch is at least one of a MOS tube and a triode.

7. The filtering circuit of a laundry treating apparatus according to any one of claims from 1 to 5, characterized in that, The discharge device is a discharge resistor.

8. A circuit board, characterized by The filter circuit of the clothes treatment apparatus according to any one of claims 1 to 7 is integrated on the circuit board. 9.A laundry treating apparatus, characterized by, The clothes treatment apparatus comprises the circuit board according to claim 8.

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