Direct-current arc elimination circuit and household appliance
By integrating motors, DC power supply circuits, forward and reverse switching circuits, and overvoltage protection circuits into home appliances, the problem of electric arc generation was solved, achieving the effects of simplified circuit design and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-27
AI Technical Summary
Existing home appliances are prone to generating electric arcs when switching between forward and reverse functions, which can shorten the lifespan of switch contacts and cause potential short circuits. Current methods for eliminating electric arcs are complex and costly.
The system employs a combination of a motor, DC power supply circuit, forward/reverse switch circuit, resistor circuit, and overvoltage protection circuit. The overvoltage protection circuit and resistor circuit provide overvoltage protection and reduce current when the motor switches operating states, thereby reducing the generation of electric arcs.
It simplifies circuit design, reduces costs, effectively eliminates electric arcs, and improves the reliability and lifespan of the motor.
Smart Images
Figure CN224053896U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electronic circuit field especially relates to a direct current arc elimination circuit and household electrical appliances. BACKGROUND
[0002] Now, some household electrical products have the function of positive and negative rotation, in order to realize the function, need to switch the direct current with switch, the electric field intensity between switch contacts will increase instantaneously in switching process, voltage mutation makes air more easily be broken down, forms spark discharge, produces electric arc, can shorten the service life of switch contact, spark is too big and can even cause switch short circuit, burn out circuit. And in order to avoid this situation, usually need to design the circuit of eliminating electric arc, for example, increase insulating grid, capacitor or other complex circuit to eliminate spark, high cost.
[0003] In addition, the patent with the publication number CN103971964A discloses a kind of direct current contactor arc extinguishing circuit, design control circuit, through control circuit to control triode on-off state mode, to reach direct current arc extinguishing effect, circuit design and logic control are complex, high cost. UTILITY MODEL CONTENTS
[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model provides a kind of direct current arc elimination circuit and household electrical appliances.
[0005] The utility model is realized through the following technical schemes:
[0006] First, a kind of direct current arc elimination circuit, comprising:
[0007] Motor;
[0008] Direct current power supply circuit;
[0009] Positive and negative rotation switch circuit, the positive pole of the direct current power supply circuit, the negative pole of the direct current power supply circuit, the positive pole of the motor and the negative pole of the motor are connected, for switching the working state of motor;
[0010] Resistance circuit, the motor and the direct current power supply circuit are connected in series;
[0011] Overvoltage protection circuit, with the motor is parallelly connected.
[0012] The utility model discloses a direct current arc elimination circuit, through setting up motor, direct current power supply circuit, positive and negative rotation switch circuit, resistance circuit and overvoltage protection circuit, positive and negative rotation switch circuit connects the positive pole of direct current power supply circuit, the negative pole of direct current power supply circuit, the positive pole of motor and the negative pole of motor, resistance circuit series connection motor and direct current power supply circuit, overvoltage protection circuit with the motor is parallel, when the voltage in the circuit exceeds certain value in the process that positive and negative rotation switch circuit switches the working state of motor, realizes overvoltage protection through overvoltage protection circuit, reduces the impact of positive and negative rotation switch circuit, is favorable to eliminating direct current arc, simultaneously through the resistance circuit between series connection motor and direct current power supply circuit reduces the voltage and current when motor working state switches, thereby reduces the possibility of generating direct current arc, realizes direct current arc elimination through resistance circuit and overvoltage protection circuit, and the circuit is simple, and cost reduces.
[0013] The overvoltage protection circuit includes a pressure-sensitive resistor or a bidirectional TVS diode in an embodiment of the technical solution.
[0014] Since the pressure-sensitive resistor has a certain critical value, when the voltage in the circuit exceeds a certain value, i.e., exceeds the critical value, the resistance value of the pressure-sensitive resistor sharply decreases, thereby discharging the voltage peak to the pressure-sensitive resistor and consuming the surge energy of the voltage exceeding the critical value, reducing the impact on the positive and negative rotation switch circuit, avoiding voltage superposition to cause large sparks, and being favorable to eliminating direct current arc. When the bidirectional TVS diode is used, when the voltage across the bidirectional TVS diode exceeds the reverse breakdown voltage, the bidirectional TVS diode rapidly conducts, limits the voltage below the clamping value, and also can realize the overvoltage protection function, reduce the impact on the positive and negative rotation switch circuit, avoid voltage superposition to cause large sparks, and be favorable to eliminating direct current arc.
[0015] The resistance circuit includes a first resistor in an embodiment of the technical solution.
[0016] The first resistor is connected between the direct current power supply circuit and the positive and negative rotation switch circuit or between the positive and negative rotation switch circuit and the motor.
[0017] The setting position of the first resistor is adjustable, which improves the flexibility of circuit design on the basis of reducing the current when the motor is started in positive and negative rotation.
[0018] The setting position of the first resistor is adjustable, which improves the flexibility of circuit design on the basis of reducing the current when the motor is started in positive and negative rotation.
[0019] The first resistor is one of a cement resistor, a thick film resistor, a wire-wound resistor, and a metal foil resistor in an embodiment of the technical solution.
[0020] The resistance type of the first resistance is selected from one of a cement resistance, a thick film resistance, a wire wound resistance and a metal foil resistance, and the first resistance is ensured to have a certain rated power, so as to avoid overheat caused by too low rated power.
[0021] In an embodiment of the above technical solution, the resistance circuit further comprises a second resistance, the second resistance is connected in series with the motor and the direct current power supply circuit, and the second resistance is connected between the direct current power supply circuit and the forward-reverse switch circuit or connected between the forward-reverse switch circuit and the motor.
[0022] On the basis of the first resistance, the second resistance is further provided, which can further strengthen the ability to reduce the current when the motor is started in forward-reverse rotation, and more greatly reduce the possibility of generating direct current arc, and still maintain the flexibility of circuit design.
[0023] In an embodiment of the above technical solution, the forward-reverse switch circuit comprises a forward switch and a reverse switch, the forward switch is connected with the positive pole of the direct current power supply circuit and the positive pole of the motor, and the reverse switch is connected with the negative pole of the direct current power supply circuit and the negative pole of the motor.
[0024] The forward switch and the reverse switch are provided, and the forward switch, the reverse switch, the motor and the direct current power supply circuit are connected, so as to ensure the normal realization of the forward-reverse rotation function.
[0025] In an embodiment of the above technical solution, the common terminal of the forward switch is connected with the positive pole of the motor, the normally closed terminal of the forward switch is connected with the normally closed terminal of the reverse switch and the negative pole of the direct current power supply circuit, the normally open terminal of the forward switch is connected with the normally open terminal of the reverse switch and the positive pole of the direct current power supply circuit, and the common terminal of the reverse switch is connected with the negative pole of the motor.
[0026] The common terminal, the normally closed terminal and the normally open terminal of the forward switch, and the common terminal, the normally closed terminal and the normally open terminal of the reverse switch are connected with the motor and the direct current power supply circuit, so as to ensure the normal realization of the forward-reverse rotation function.
[0027] In an embodiment of the above technical solution, the direct current power supply circuit comprises a rectifier bridge, the first input terminal of the rectifier bridge is used for connecting a live wire, the second input terminal of the rectifier bridge is used for connecting a neutral wire, the positive pole direct current output terminal of the rectifier bridge is connected with the forward switch, and the negative pole direct current output terminal of the rectifier bridge is connected with the reverse switch.
[0028] The rectifier bridge is provided, so as to ensure the effective output of direct current.
[0029] In a second aspect, a household appliance comprises the DC arc elimination circuit as described above.
[0030] The household appliance of the utility model has the advantages that the motor, the DC power supply circuit, the forward-reverse switch circuit, the resistance circuit and the overvoltage protection circuit are arranged, the forward-reverse switch circuit is connected with the positive pole of the DC power supply circuit, the negative pole of the DC power supply circuit, the positive pole of the motor and the negative pole of the motor, the resistance circuit is connected in series with the motor and the DC power supply circuit, and the overvoltage protection circuit is connected in parallel with the motor, when the voltage in the circuit exceeds a certain value in the process of switching the working state of the motor by the forward-reverse switch circuit, overvoltage protection is realized by the overvoltage protection circuit, the impact of the forward-reverse switch circuit is reduced, the DC arc is eliminated, the voltage and the current when the working state of the motor is switched are reduced by the resistance circuit connected between the motor and the DC power supply circuit, the possibility of generating the DC arc is reduced, the DC arc is eliminated by the resistance circuit and the overvoltage protection circuit, the circuit is simple, the cost is reduced, and therefore the manufacturing cost of the household appliance is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0031] Figure 1 is a schematic view of the DC arc elimination circuit when the motor is in the static state.
[0032] Figure 2 is a schematic view of the DC arc elimination circuit when the motor is in the forward rotation state.
[0033] Figure 3 is a block schematic view of the household appliance. DETAILED DESCRIPTION
[0034] In the present specification, the orientation terms such as up, down, left, right, front, back, front face, back face, top, bottom, and the like mentioned or possibly mentioned are defined with respect to the configuration shown in the drawings, and are relative concepts, and thus, can be changed accordingly depending on different positions, different use states, and the like. Therefore, these or other orientation terms should not be interpreted as restrictive terms.
[0035] Please refer to Figure 1 - Figure 3 . Figure 1 is a schematic view of the DC arc elimination circuit 100 when the motor is in the static state, Figure 2 is a schematic view of the DC arc elimination circuit 100 when the motor is in the forward rotation state, Figure 3 is a block schematic view of the household appliance 200.
[0036] In a first aspect, the DC arc elimination circuit 100 of the utility model comprises a motor MOT, a DC power supply circuit 10, a forward-reverse switch circuit 20, a resistance circuit 30 and an overvoltage protection circuit 40.
[0037] In one embodiment, the positive and negative rotation switch circuit 20 connects the positive pole of the direct current power supply circuit 10, the negative pole of the direct current power supply circuit 10, the positive pole of the motor MOT and the negative pole of the motor MOT, the resistance circuit 30 is connected in series with the motor MOT and the direct current power supply circuit 10, and the overvoltage protection circuit 40 is connected in parallel with the motor MOT.
[0038] The direct current arc elimination circuit of the utility model has the advantages that the motor MOT, the direct current power supply circuit 10, the positive and negative rotation switch circuit 20, the resistance circuit 30 and the overvoltage protection circuit 40 are arranged, the positive and negative rotation switch circuit 20 connects the positive pole of the direct current power supply circuit 10, the negative pole of the direct current power supply circuit 10, the positive pole of the motor MOT and the negative pole of the motor MOT, the resistance circuit 30 is connected in series with the motor MOT and the direct current power supply circuit 10, and the overvoltage protection circuit 40 is connected in parallel with the motor MOT, when the voltage in the circuit exceeds a certain value during the process of switching the working state of the motor MOT by the positive and negative rotation switch circuit 20, the overvoltage protection is realized by the overvoltage protection circuit 40, the impact on the positive and negative rotation switch circuit 20 is reduced, the direct current arc is eliminated, the voltage and the current during the switching of the working state of the motor MOT are reduced by the resistance circuit 30 connected in series between the motor MOT and the direct current power supply circuit 10, the possibility of generating the direct current arc is reduced, the direct current arc is eliminated by the resistance circuit 30 and the overvoltage protection circuit 40, the circuit is simple, the reliability is high and the cost is reduced.
[0039] In one embodiment, the overvoltage protection circuit 40 comprises a pressure sensitive resistor RV or a bidirectional TVS diode. Figure 1 and Figure 2 As shown in the utility model, the pressure sensitive resistor RV is taken as an example, because the pressure sensitive resistor RV has a certain critical value, when the voltage in the circuit exceeds a certain value, that is, exceeds the critical value, the resistance value of the pressure sensitive resistor RV sharply decreases, thereby discharging the voltage peak to the pressure sensitive resistor RV and consuming the surge energy of the voltage exceeding the critical value, reducing the impact on the positive and negative rotation switch circuit 20, avoiding the voltage superposition causing large sparks and eliminating the direct current arc. When the bidirectional TVS diode is used, whether the motor realizes the positive rotation function or the reverse rotation function, when the voltage across the bidirectional TVS diode exceeds the reverse breakdown voltage, the bidirectional TVS diode is rapidly turned on, the voltage is limited below the clamping value, overvoltage protection is realized, the impact on the positive and negative rotation switch circuit 20 is reduced, voltage superposition causing large sparks is avoided and the direct current arc is eliminated.
[0040] In an embodiment, the forward-reverse switch circuit 20 is used to switch the working state of the motor MOT, and the working state of the motor MOT includes a forward rotation state, a reverse rotation state and a static state; the forward-reverse switch circuit 20 includes a forward rotation switch SW1 and a reverse rotation switch SW2; the forward rotation switch SW1 is connected to the positive pole of the direct current power supply circuit 10 and the positive pole of the motor MOT, and the reverse rotation switch SW2 is connected to the negative pole of the direct current power supply circuit 10 and the negative pole of the motor MOT.
[0041] In an embodiment, the common terminal (the second pin) of the forward rotation switch SW1 is connected to the positive pole of the motor MOT, the normally closed terminal (the first pin) of the forward rotation switch SW1 is connected to the normally closed terminal (the first pin) of the reverse rotation switch SW2 and the negative pole of the direct current power supply circuit 10, the normally open terminal (the third pin) of the forward rotation switch SW1 is connected to the normally open terminal (the third pin) of the reverse rotation switch SW2 and the positive pole of the direct current power supply circuit 10, and the common terminal (the second pin) of the reverse rotation switch SW2 is connected to the negative pole of the motor MOT. It should be noted that the forward rotation switch SW1 and the reverse rotation switch SW2 can be mechanical switches, when the forward rotation switch SW1 is operated, the motor can be made to rotate forward, at this time, the working state of the motor MOT is the forward rotation state, when the reverse rotation switch SW2 is operated, the motor can be made to rotate reverse, at this time, the working state of the motor MOT is the reverse rotation state, thereby realizing the forward-reverse rotation switching function.
[0042] In an embodiment, the resistance circuit 30 includes a first resistance R1, and the first resistance R1 is connected in series with the motor MOT and the direct current power supply circuit 10.
[0043] Optionally, the setting position of the first resistance R1 can be adjusted based on actual conditions, and the circuit design has high flexibility. In an embodiment, the first resistance R1 can be connected between the forward-reverse switch circuit 20 and the motor MOT, for example, connected between the common terminal (the second pin) of the forward rotation switch SW1 and the positive pole of the motor MOT or connected between the common terminal (the second pin) of the reverse rotation switch SW2 and the negative pole of the motor MOT, thereby realizing that the first resistance R1 is connected in series with the motor MOT and the direct current power supply circuit 10. Alternatively, in another embodiment, the first resistance R1 is connected between the direct current power supply circuit 10 and the forward-reverse switch circuit 20, for example, the first resistance R1 is connected between the direct current power supply circuit 10 and the normally open terminal (the third pin) of the forward rotation switch SW1; or alternatively, the first resistance R1 is connected between the direct current power supply circuit 10 and the normally closed terminal (the first pin) of the reverse rotation switch SW2, and the first resistance R1 can also be connected in series with the motor MOT and the direct current power supply circuit 10.
[0044] It should be noted that the utility model takes Figure 1The method shown, in which the first resistor R1 is connected between the DC power supply circuit 10 and the forward / reverse switch circuit 20, helps to better avoid the situation where the voltage drop generated when the motor MOT starts switching forward and reverse due to the first resistor R1 being connected between the forward / reverse switch circuit 20 and the motor MOT affects the motor MOT and reduces the life of the motor MOT.
[0045] In one embodiment, the first resistor R1 is one of a cement resistor, a thick film resistor, a wire-wound resistor, and a metal foil resistor, ensuring that the first resistor R1 has a certain rated power, which is determined based on the specific situation, such as 4W or more, to avoid overheating due to insufficient rated power; wherein, this utility model takes the use of a cement resistor as an example, as the cement resistor has good heat dissipation performance, further reducing the possibility of overheating.
[0046] In one embodiment, the resistor circuit 30 further includes a second resistor R2, which is connected in series with the motor MOT and the DC power supply circuit 10. Similarly, the position of the second resistor R2 can be adjusted based on actual conditions, further improving the flexibility of the circuit design. In one embodiment, the second resistor R2 can be connected between the forward / reverse switch circuit 20 and the motor MOT, for example, between the common terminal (pin 2) of the forward switch SW1 and the positive terminal of the motor MOT, or between the common terminal (pin 2) of the reverse switch SW2 and the negative terminal of the motor MOT, thereby realizing the second resistor R2 connected in series with the motor MOT and the DC power supply circuit 10. Alternatively, in another embodiment, the second resistor R2 is connected between the DC power supply circuit 10 and the forward / reverse switch circuit 20, for example, between the DC power supply circuit 10 and the normally closed terminal (pin 1) of the reverse switch SW2, such as... Figure 1 The diagram shows the solution adopted in this invention; alternatively, the second resistor R2 can be connected between the DC power supply circuit 10 and the normally open terminal (pin 3) of the forward switch SW1, which also achieves the same effect of connecting the second resistor R2 in series with the motor MOT and the DC power supply circuit 10.
[0047] Similarly, such as Figure 1As shown, connecting the second resistor R2 between the direct current power supply circuit 10 and the forward and reverse switch circuit 20 is beneficial to better avoid the situation that the voltage drop generated when the motor MOT is started by switching the forward and reverse rotation causes the influence on the motor MOT and reduces the service life of the motor MOT. Similarly, the second resistor R2 is one of the cement resistor, the thick film resistor, the wire wound resistor and the metal foil resistor, and the second resistor R2 is ensured to have a certain size of rated power, which is based on specific conditions, for example, 4W or more, to avoid the situation that overheating occurs due to the too low rated power; the second resistor R2 of the utility model also takes the cement resistor as an example.
[0048] In an embodiment, the direct current power supply circuit 10 comprises a rectifier bridge, and the effective output of the direct current is ensured by the arrangement of the rectifier bridge. The rectifier bridge is composed of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, the connection place of the first diode D1 and the third diode D3 is the first input terminal, the connection place of the second diode D2 and the fourth diode D4 is the second input terminal, the connection place of the third diode D3 and the fourth diode D4 is the positive direct current output terminal (equivalent to the positive pole of the direct current power supply circuit 10), and the connection place of the first diode D1 and the second diode D2 is the negative direct current output terminal (equivalent to the negative pole of the direct current power supply circuit 10). The first input terminal is used for connecting the live wire L, the second input terminal of the rectifier bridge is used for connecting the neutral wire N, the positive direct current output terminal of the rectifier bridge is connected with the forward switch SW1, and the negative direct current output terminal of the rectifier bridge is connected with the reverse switch SW2. Figure 1 As shown, the positive direct current output terminal of the rectifier bridge is connected with the normally open end (the third pin) of the forward switch SW1 through the first resistor R1, and the negative direct current output terminal of the rectifier bridge is connected with the normally closed end (the first pin) of the reverse switch SW2 through the second resistor R2.
[0049] In an embodiment, the direct current power supply circuit 10 further comprises a fuse F1, and the fuse F1 is connected with the first input terminal of the rectifier bridge. Specifically, one end of the fuse F1 is connected with the first input terminal of the rectifier bridge, and the other end is used for connecting the live wire L. The fuse F1 is arranged to provide overcurrent protection for the circuit.
[0050] Hereinafter, the direct current arc elimination circuit of Figure 1 is taken as an example to illustrate the principle. The normal realization of the forward and reverse rotation function of the motor MOT can be ensured by the arrangement and connection of the forward switch SW1 and the reverse switch SW2.
[0051] 1、As shown in Figure 2As shown, when the forward rotation switch SW1 is operated, the common terminal (the second pin) of the forward rotation switch SW1 is connected with the normally open terminal (the third pin) of the forward rotation switch SW1 to form a path, at this time, the current flows as follows: the positive pole of the direct current power supply circuit 10→the first resistor R1→the forward rotation switch SW1→the positive pole of the motor MOT→the negative pole of the motor MOT→the reverse rotation switch SW2→the second resistor R2→the negative pole of the direct current power supply circuit 10, so that the motor MOT is in the forward rotation state, thereby realizing the forward rotation function of the motor MOT.
[0052] 2、When the reverse rotation switch SW2 is operated, the normally open terminal (the third pin) of the reverse rotation switch SW2 is connected with the common terminal (the second pin) of the reverse rotation switch SW2 to form a path, at this time, the current flows as follows: the positive pole of the direct current power supply circuit 10→the first resistor R1→the reverse rotation switch SW2→the negative pole of the motor MOT→the positive pole of the motor MOT→the forward rotation switch SW1→the second resistor R2→the negative pole of the direct current power supply circuit 10, so that the motor MOT is in the reverse rotation state, thereby realizing the reverse rotation function of the motor MOT.
[0053] And generally, when the common terminal (the second pin) of the forward rotation switch SW1 is connected with the normally closed terminal (the first pin) of the forward rotation switch SW1 to form a path, and the common terminal (the second pin) of the reverse rotation switch SW2 is connected with the normally closed terminal (the first pin) of the reverse rotation switch SW2 to form a path, the positive pole of the motor MOT is connected with the negative pole of the direct current power supply circuit, and the negative pole of the motor MOT is also connected with the negative pole of the direct current power supply circuit 10, at this time, the motor MOT is in the static state, i.e. the motor MOT stops working.
[0054] Therefore, in the embodiment, the working state of the motor MOT can be switched by operating the forward and reverse rotation switch circuit 20, i.e. the working state of the motor MOT can be switched from the static state to the forward rotation state or the reverse rotation state by operating the forward and reverse rotation switch circuit 20, or from the forward rotation state to the reverse rotation state, or from the reverse rotation state to the forward rotation state.
[0055] Among them, whether it is the realization of the forward rotation function or the reverse rotation function of the motor MOT, the first resistor R1 and the second resistor R2 connected in series with the motor MOT can reduce the current when the motor MOT starts to rotate, thereby reducing the possibility of generating a direct current arc; and the second resistor R2 further arranged on the first resistor R1 works together to further strengthen the ability to reduce the current when the motor MOT starts to rotate, thereby reducing the possibility of generating a direct current arc to a greater extent, achieving better results.
[0056] As shown in the first aspect, a direct current arc elimination circuit 100 is provided. Figure 3
[0057] The household electrical appliance is provided with the motor MOT, the direct current power supply circuit 10, the forward-reverse switch circuit 20, the resistance circuit 30 and the overvoltage protection circuit 40, the forward-reverse switch circuit 20 is connected with the positive pole of the direct current power supply circuit 10, the negative pole of the direct current power supply circuit 10, the positive pole of the motor MOT and the negative pole of the motor MOT, the resistance circuit 30 is connected in series with the motor MOT and the direct current power supply circuit 10, and the overvoltage protection circuit 40 is connected in parallel with the motor MOT, when the voltage in the circuit exceeds a certain value in the process of switching the working state of the motor MOT by the forward-reverse switch circuit 20, overvoltage protection is realized by the overvoltage protection circuit 40, the impact of the forward-reverse switch circuit 20 is reduced, the direct current arc is beneficial to be eliminated, and the voltage and the current when the working state of the motor MOT is switched are reduced by the resistance circuit 30 connected in series between the motor MOT and the direct current power supply circuit 10, so that the possibility of generating the direct current arc is reduced, the direct current arc is eliminated by the resistance circuit 30 and the overvoltage protection circuit 40, the circuit is simple, the reliability is high, and the cost is reduced, and therefore the manufacturing cost of the household electrical appliance 200 is reduced.
[0058] It should be noted that the household electrical appliance 200 of the utility model includes but is not limited to any product using a switch to switch direct current, such as an electric can opener, an electric vegetable cutter and an electric meat grinder, and is not specifically limited,
[0059] The utility model is not limited to the above-mentioned embodiments, and various modifications or deformations of the utility model do not deviate from the spirit and scope of the utility model, and the modifications and deformations belong to the claims and equivalent technical scope of the utility model, so the utility model also intends to include the modifications and deformations.
Claims
1. A direct current arc elimination circuit, characterized by, Comprising: a motor (MOT); a direct current power supply circuit (10); a forward-reverse switch circuit (20) connecting a positive pole of the direct current power supply circuit (10), a negative pole of the direct current power supply circuit (10), a positive pole of the motor (MOT) and a negative pole of the motor (MOT) for switching the working state of the motor (MOT); a resistance circuit (30) connecting the motor (MOT) and the direct current power supply circuit (10) in series; an overvoltage protection circuit (40) connected in parallel with the motor (MOT).
2. The direct current arc elimination circuit of claim 1, wherein: The overvoltage protection circuit (40) comprises a pressure sensitive resistor (RV) or a bidirectional TVS diode.
3. The DC arc elimination circuit of claim 1, wherein: The resistance circuit (30) comprises a first resistor (R1) connecting the motor (MOT) and the direct current power supply circuit (10) in series.
4. The DC arc elimination circuit of claim 3, wherein: The first resistor (R1) is connected between the direct current power supply circuit (10) and the forward-reverse switch circuit (20) or between the forward-reverse switch circuit (20) and the motor (MOT).
5. The DC arc elimination circuit of claim 3, wherein: The first resistor (R1) is one of a cement resistor, a thick film resistor, a wire wound resistor and a metal foil resistor.
6. The DC arc elimination circuit of claim 4, wherein: The resistance circuit (30) further comprises a second resistor (R2) connecting the motor (MOT) and the direct current power supply circuit (10) in series, the second resistor (R2) being connected between the direct current power supply circuit (10) and the forward-reverse switch circuit (20) or between the forward-reverse switch circuit (20) and the motor (MOT).
7. The DC arc elimination circuit according to any one of claims 1 to 6, characterized in that: The forward-reverse switch circuit (20) comprises a forward switch (SW1) and a reverse switch (SW2), the forward switch (SW1) connecting the positive pole of the direct current power supply circuit (10) and the positive pole of the motor (MOT), the reverse switch (SW2) connecting the negative pole of the direct current power supply circuit (10) and the negative pole of the motor (MOT).
8. The DC arc elimination circuit of claim 7, wherein: A common terminal of the forward switch (SW1) is connected to the positive pole of the motor (MOT), a normally closed terminal of the forward switch (SW1) is connected to a normally closed terminal of the reverse switch (SW2) and the negative pole of the direct current power supply circuit (10), a normally open terminal of the forward switch (SW1) is connected to a normally open terminal of the reverse switch (SW2) and the positive pole of the direct current power supply circuit (10), and a common terminal of the reverse switch (SW2) is connected to the negative pole of the motor (MOT).
9. The DC arc elimination circuit of claim 7, wherein: The direct current power supply circuit (10) comprises a rectifier bridge, a first input terminal of the rectifier bridge being used for connecting a live wire (L), a second input terminal of the rectifier bridge being used for connecting a neutral wire (N), a positive DC output terminal of the rectifier bridge being connected to the forward switch (SW1), and a negative DC output terminal of the rectifier bridge being connected to the reverse switch (SW2).
10. An electric home appliance characterized by comprising: Comprising: The direct current arc elimination circuit of any one of claims 1-9.
Citation Information
Patent Citations
Arc extinguishing circuit of direct-current contactor
CN103971964A