Anti-electromagnetic interference circuit for food waste processor

Abstract

The utility model discloses an anti-electromagnetic interference circuit for a food waste processor, which comprises a power supply filter circuit connected to the output end of an alternating current power supply and used for filtering electromagnetic interference of the alternating current power supply; the rectifying circuit is connected to the output end of the power supply filter circuit and is used for converting alternating current into direct current; one end of the motor filter circuit is connected to the output end of the rectifying circuit, and the motor filter circuit is used for filtering electromagnetic interference of an alternating current power supply on the motor; and the other end of the motor filter circuit is connected to the control end of the motor and is used for filtering electromagnetic interference of the motor on the alternating current power supply and the food waste processor switch.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-electromagnetic interference circuits, in particular to an anti-electromagnetic interference circuit for a food waste disposer. Background Art

[0002] A food waste disposer, also known as a kitchen waste processor, is an electrical device installed under the kitchen sink to efficiently process kitchen food waste. By grinding food waste into very small particles and then discharging them through the sewer, it reduces the generation of food waste and helps keep the home kitchen clean and environmentally friendly.

[0003] When food waste is put into the disposer, the grinding mechanism in the disposer (usually including a grinding disc and a fixed grinding ring) will rotate at high speed, grinding the food residue into very small particles through physical shear force. During the grinding process, water needs to flow through the disposer so that the ground fine particles can be washed away with the water flow and discharged through the sewer. The core of the food waste disposer is a motor, which provides power for the grinding system. However, due to the high-speed operation of the motor, it will cause electromagnetic interference to other hardware in the disposer (switches, indicator lights, etc.), causing the hardware function to fail. For example, the motor will cause electromagnetic interference to the processor switch, causing the switch to fail and unable to open and close normally; at the same time, since the processor is directly connected to the AC power supply, the AC power supply will also cause electromagnetic interference to other hardware such as the motor in the processor, affecting its normal operation.

[0004] Furthermore, if the motor is idling for a long time or food waste residue is stuck, it will generate high temperature and then overheat, causing other hardware modules to overload and burn out. Existing food waste disposers generally have a thermal fuse at the connection position between the live wire of the AC power supply and the processor. If an overload occurs, the power supply will be disconnected in time. However, when the processor is not working, it is impossible to directly know whether the failure is caused by overload or other faults. It is necessary to further power off and disassemble the food waste disposer for inspection and maintenance, which increases the workload.

[0005] The purpose of the present invention is to design an anti-electromagnetic interference circuit for a food waste disposer in view of the above-mentioned problems in the prior art. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an anti-electromagnetic interference circuit for a food waste disposer, which can solve the above-mentioned technical problems.

[0007] The utility model provides an anti-electromagnetic interference circuit for a food waste disposer, the food waste disposer comprising: a grinding mechanism, a motor electrically connected to the grinding mechanism;

[0008] The anti-electromagnetic interference circuit comprises:

[0009] A power filter circuit is connected to the AC power output terminal and is used to filter out electromagnetic interference of the AC power;

[0010] A rectifier circuit, connected to the output end of the power filter circuit, for converting AC power into DC power;

[0011] One end of the motor filter circuit is connected to the output end of the rectifier circuit to filter out the electromagnetic interference of the AC power supply to the motor; the other end of the motor filter circuit is connected to the control end of the motor to filter out the electromagnetic interference of the motor to the AC power supply and the food waste disposer switch.

[0012] Furthermore, the input end of the power supply filter circuit is connected to a motor overload indication circuit for indicating power failure of the motor when it is overloaded.

[0013] Furthermore, the motor overload indication circuit comprises:

[0014] A thermal fuse is connected in series to the live wire of the AC power supply to detect the temperature of the line;

[0015] A resistor R1, a diode D1, and a light-emitting diode are connected in series in sequence to form an indication circuit, and the indication circuit is connected in parallel to both ends of the temperature fuse to form a motor overload indication circuit for providing a light-emitting prompt when the temperature fuse is disconnected.

[0016] Furthermore, the temperature fuse is connected in series with a current fuse F1 to prevent fire after the temperature fuse fails.

[0017] Furthermore, the power supply filter circuit includes: a π-type filter circuit, a varistor TVR, a discharge resistor R2, and a Y-type capacitor CY1 and a Y-type capacitor CY2 connected in series in sequence;

[0018] The input end of the π-type filter circuit is connected to the two ends of the AC power supply to filter out electromagnetic interference of the AC power supply;

[0019] The varistor TVR is connected in parallel to both ends of the π-type filter circuit to prevent lightning surges;

[0020] The discharge resistor R2 is connected in parallel to both ends of the π-type filter circuit to prevent electric shock;

[0021] The Y-type capacitor CY1 and the Y-type capacitor CY2, which are sequentially connected in series, are connected in parallel to both ends of the π-type filter circuit to further filter out the electromagnetic interference of the AC power supply.

[0022] Further, the π-type filter circuit includes: an input capacitor C1 connected in parallel between the AC power input terminal and the ground terminal, an output capacitor CX1 connected in parallel between the AC power output terminal and the ground terminal, and an inductor L1 arranged between the input capacitor C1 and the output capacitor CX1;

[0023] The inductor L1 is used to filter out the common mode interference of the AC power supply;

[0024] The input capacitor C1 and the output capacitor CX1 are used to filter out differential mode interference of the AC power supply.

[0025] Furthermore, a magnetic ring is wound around the output line of the AC power supply to filter out external electromagnetic interference to the output line of the AC power supply and electromagnetic interference from the output line of the AC power supply to the food waste disposer.

[0026] Furthermore, the rectifier circuit is a bridge rectifier device B1.

[0027] Further, the motor filter circuit includes: an inductor L2 and an inductor L3;

[0028] The inductor L2 and the inductor L3 are respectively connected in series to the output end of the rectifier circuit, and the inductor L2 and the inductor L3 form an I-shaped inductor for filtering out the electromagnetic interference of the motor to the AC power supply and the food waste disposer switch.

[0029] The utility model has the following advantages:

[0030] First, due to the basic characteristics of AC power supply, its voltage and current change periodically over time, this change leads to the periodic generation and change of electromagnetic field, thus generating radiated or conducted electromagnetic interference. The change of electromagnetic field can affect the nearby electronic circuits, so the power filter circuit is used to filter out this part of interference, ensuring the electromagnetic compatibility of the overall processor.

[0031] Secondly, during the operation of the motor, the electromagnetic induction working principle of the motor, the movement of the commutator and brushes inside the motor, and the wire current of the motor will cause high-frequency electromagnetic interference. Therefore, this part of the electromagnetic interference is filtered out by the motor filter circuit to ensure the electromagnetic compatibility of the overall processor.

[0032] The third is to connect an indicator circuit in parallel at both ends of the temperature fuse. When the temperature fuse is disconnected, the indicator circuit will be turned on and the light-emitting diode will light up as a prompt. The user can start the garbage disposal after power is turned off according to this indicator light to ensure the safe use of the processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is the anti-electromagnetic interference circuit diagram of this embodiment. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is particularly noted that the following embodiments are only used to illustrate the present invention, but do not limit the scope of the present invention. Similarly, the following embodiments are only partial embodiments of the present invention rather than all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, the present solution provides an anti-electromagnetic interference circuit for a food waste disposer, the food waste disposer comprising: a grinding mechanism, a motor electrically connected to the grinding mechanism;

[0037] The anti-electromagnetic interference circuit comprises:

[0038] A power filter circuit is connected to the AC power output terminal and is used to filter out electromagnetic interference of the AC power;

[0039] A rectifier circuit, connected to the output end of the power filter circuit, for converting AC power into DC power;

[0040] One end of the motor filter circuit is connected to the output end of the rectifier circuit to filter out the electromagnetic interference of the AC power supply to the motor; the other end of the motor filter circuit is connected to the control end of the motor to filter out the electromagnetic interference of the motor to the AC power supply and the food waste disposer switch.

[0041] In this embodiment, since the basic characteristic of the AC power supply is that its voltage and current change periodically over time, this change leads to the periodic generation and change of the electromagnetic field, thereby generating radiated or conducted electromagnetic interference. The change of the electromagnetic field can affect the nearby electronic circuits, so this part of the interference is filtered out by the power supply filter circuit; during the operation of the motor, the electromagnetic induction working principle of the motor, the movement of the commutator and brushes inside the motor, and the wire current of the motor will cause high-frequency electromagnetic interference, so this part of the electromagnetic interference is filtered out by the motor filter circuit, ensuring the electromagnetic compatibility of the overall processor.

[0042] It should be noted that the food waste disposer switch in this embodiment can be set at the AC power input end, at the front end of the motor overload indication circuit; an air switch can also be set as the main switch of the food waste disposer; both of these settings will be interfered by the high-frequency signals generated by the AC power supply and the motor when working.

[0043] Furthermore, the input end of the power supply filter circuit is connected to a motor overload indication circuit for indicating power failure of the motor when it is overloaded.

[0044] Specifically, the motor overload indication circuit includes:

[0045] A thermal fuse is connected in series to the live wire of the AC power supply to detect the temperature of the line;

[0046] A resistor R1, a diode D1, and a light-emitting diode are connected in series in sequence to form an indication circuit, and the indication circuit is connected in parallel to both ends of the temperature fuse to form a motor overload indication circuit for providing a light-emitting prompt when the temperature fuse is disconnected.

[0047] Furthermore, the temperature fuse is connected in series with a current fuse F1 to prevent fire after the temperature fuse fails.

[0048] In this embodiment, if the motor is idle for a long time or food waste residue is stuck, it will generate high temperature and then overheat, causing other hardware modules to overload and burn out. Existing food waste disposers generally have a temperature fuse installed at the connection position between the live wire of the AC power supply and the processor. If an overload occurs, the power supply will be disconnected in time. However, when the processor does not work, it is impossible to directly know whether the processor does not work due to overload or other faults. Therefore, the temperature fuse and the indicator circuit are provided. When the temperature fuse is disconnected, the indicator circuit will be turned on and the light-emitting diode will light up to prompt the user. According to this indicator, the garbage disposal will be started after the power is turned off to ensure the safety of the processor. Since the indicator circuit is directly connected to the output end of the AC power supply, the resistor R1 needs to be used for current limiting here to prevent the large current of the AC power supply from impacting the light-emitting diode. The diode D1 is used to cooperate with the unidirectional conduction of the light-emitting diode.

[0049] Furthermore, the power supply filter circuit includes: a π-type filter circuit, a varistor TVR, a discharge resistor R6, and a Y-type capacitor CY1 and a Y-type capacitor CY2 connected in series in sequence;

[0050] The input end of the π-type filter circuit is connected to the two ends of the AC power supply to filter out electromagnetic interference of the AC power supply;

[0051] Further, the π-type filter circuit includes: an input capacitor C1 connected in parallel between the AC power input terminal and the ground terminal, an output capacitor CX1 connected in parallel between the AC power output terminal and the ground terminal, and an inductor L1 arranged between the input capacitor C1 and the output capacitor CX1;

[0052] The inductor L1 is used to filter out the common mode interference of the AC power supply;

[0053] The input capacitor C1 and the output capacitor CX1 are used to filter out differential mode interference of the AC power supply.

[0054] The varistor TVR is connected in parallel to both ends of the π-type filter circuit to prevent lightning surges;

[0055] The discharge resistor R2 is connected in parallel to both ends of the π-type filter circuit to prevent electric shock;

[0056] The Y-type capacitor CY1 and the Y-type capacitor CY2, which are sequentially connected in series, are connected in parallel to both ends of the π-type filter circuit to further filter out the electromagnetic interference of the AC power supply.

[0057] In this embodiment, a low impedance path is provided through the input capacitor C1 to allow the noise to flow to the ground line, thereby reducing the high-frequency interference signal in the input signal, and any additional high-frequency interference that may accumulate during the circuit passing process is cleared through the output capacitor CX1. Inductor L1 has a higher impedance to high-frequency signals, thereby suppressing high-frequency noise passing through inductor L1, but allowing low-frequency or DC signals to pass. The high-frequency differential mode signal is further filtered out by Y-type capacitors CY1 and CY2.

[0058] Furthermore, a magnetic ring is wound around the output line of the AC power supply to filter out electromagnetic interference from the outside to the output line of the AC power supply and electromagnetic interference from the output line of the AC power supply to the food waste disposer.

[0059] In this embodiment, the output lines L, N, and E of the AC power supply respectively represent the live line, the neutral line, and the earth line. When the power line passes around the magnetic ring, it is to reduce the electromagnetic interference (EMI) of the AC power line to the outside and improve the anti-interference ability of the AC power line.

[0060] Furthermore, the rectifier circuit is a bridge rectifier device B1.

[0061] In this embodiment, the bridge rectifier device model used is KBPC808, and the specific working principle of the rectifier circuit is the existing technology and will not be described here.

[0062] Further, the motor filter circuit includes: an inductor L2 and an inductor L3;

[0063] The inductor L2 and the inductor L3 are respectively connected in series to the output end of the rectifier circuit, and the inductor L2 and the inductor L3 form an I-shaped inductor for filtering out the electromagnetic interference of the motor to the AC power supply and the food waste disposer switch.

[0064] In this embodiment, the characteristic of the inductor is to ensure that the current cannot change suddenly, so the inductor L2 and the inductor L3 can be used to form an I-shaped inductor to filter out the high-frequency interference signal of the peak surge of the motor.

[0065] The above descriptions are only some embodiments of the present invention, and do not limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An anti-electromagnetic interference circuit for a food waste disposer, characterized in that: The food waste disposer includes: a grinding mechanism, a motor electrically connected to the grinding mechanism; The anti-electromagnetic interference circuit comprises: A power filter circuit is connected to the AC power output terminal and is used to filter out electromagnetic interference of the AC power; A rectifier circuit, connected to the output end of the power filter circuit, for converting AC power into DC power; One end of the motor filter circuit is connected to the output end of the rectifier circuit to filter out the electromagnetic interference of the AC power supply to the motor; the other end of the motor filter circuit is connected to the control end of the motor to filter out the electromagnetic interference of the motor to the AC power supply and the food waste disposer switch.

2. The anti-electromagnetic interference circuit for a food waste disposer according to claim 1, characterized in that: The input end of the power filter circuit is connected to a motor overload indication circuit for indicating power failure of the motor when it is overloaded.

3. The anti-electromagnetic interference circuit for a food waste disposer according to claim 2, characterized in that: The motor overload indication circuit comprises: A thermal fuse is connected in series to the live wire of the AC power supply to detect the temperature of the line; A resistor R1, a diode D1, and a light-emitting diode are connected in series in sequence to form an indication circuit, and the indication circuit is connected in parallel to both ends of the temperature fuse to form a motor overload indication circuit for providing a light-emitting prompt when the temperature fuse is disconnected.

4. The anti-electromagnetic interference circuit for a food waste disposer according to claim 3, characterized in that: The temperature fuse is connected in series with a current fuse F1 to prevent fire after the temperature fuse fails.

5. The anti-electromagnetic interference circuit for a food waste disposer according to claim 1, characterized in that: The power supply filter circuit comprises: a π-type filter circuit, a varistor TVR, a discharge resistor R2, and a Y-type capacitor CY1 and a Y-type capacitor CY2 connected in series in sequence; The input end of the π-type filter circuit is connected to the two ends of the AC power supply to filter out electromagnetic interference of the AC power supply; The varistor TVR is connected in parallel to both ends of the π-type filter circuit to prevent lightning surges; The discharge resistor R2 is connected in parallel to both ends of the π-type filter circuit to prevent electric shock; The Y-type capacitor CY1 and the Y-type capacitor CY2, which are sequentially connected in series, are connected in parallel to both ends of the π-type filter circuit to further filter out the electromagnetic interference of the AC power supply.

6. The anti-electromagnetic interference circuit for a food waste disposer according to claim 5, characterized in that: The π-type filter circuit comprises: an input capacitor C1 connected in parallel between the input terminal of the AC power supply and the ground terminal, an output capacitor CX1 connected in parallel between the output terminal of the AC power supply and the ground terminal, and an inductor L1 arranged between the input capacitor C1 and the output capacitor CX1; The inductor L1 is used to filter out the common mode interference of the AC power supply; The input capacitor C1 and the output capacitor CX1 are used to filter out differential mode interference of the AC power supply.

7. The anti-electromagnetic interference circuit for a food waste disposer according to claim 1, characterized in that: A magnetic ring is wound around the output line of the AC power supply to filter out external electromagnetic interference to the output line of the AC power supply and electromagnetic interference of the output line of the AC power supply to the food waste disposer.

8. The anti-electromagnetic interference circuit for a food waste disposer according to claim 1, characterized in that: The rectifier circuit is a bridge rectifier device B1.

9. The anti-electromagnetic interference circuit for a food waste disposer according to claim 1, characterized in that: The motor filter circuit includes: an inductor L2 and an inductor L3; The inductor L2 and the inductor L3 are respectively connected in series to the output end of the rectifier circuit, and the inductor L2 and the inductor L3 form an I-shaped inductor for filtering out the electromagnetic interference of the motor to the AC power supply and the food waste disposer switch.

Images