Built-in circuit and microwave oven

Abstract

The utility model provides a built-in circuit and a microwave oven, the circuit comprises a noise filter, a temperature controller, a master control module, a numerical control circuit and a transformer, one end of the noise filter is connected with a mains supply through a plug, and the other end of the noise filter is respectively connected with the master control module, the numerical control circuit and one end of an oven lamp L1 in the microwave oven through the temperature controller; the other end of the numerical control circuit and the other end of the furnace lamp L1 are connected with the main control module. The main control module is connected with the magnetron through the transformer. According to the built-in circuit and the microwave oven provided by the utility model, the arrangement of the circuit structure is simplified, the safety and reliability of the circuit are improved, the cost of the circuit is reduced, the probability that the circuit fuse is burnt is reduced, and the stability of the circuit is improved under the condition that UL and CUL standards are met at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of microwave oven, specifically, relate to a built-in circuit and microwave oven. BACKGROUND

[0002] The built-in electrical connection circuit in the microwave oven exported to America needs to meet UL and CUL standards. Because the UL and CUL standards are different, the setting of the electrical connection circuit in the microwave oven often cannot meet the CUL standard when meeting the UL standard, and the setting of the circuit cannot meet the UL standard when meeting the CUL standard. At present, in order to meet the UL and CUL standards at the same time, the electrical connection circuit of the microwave oven often needs to increase additional switches, such as relays, which easily causes the increase of the cost of the microwave oven. In addition, another problem of the traditional electrical connection circuit is that the probability of burning the fuse during the opening and closing of the microwave oven is large. Therefore, it is of great significance to study how to reduce the cost of the circuit in the microwave oven, improve the reliability of the circuit, and avoid the burning of the fuse.

[0003] In the patent publication No. CN101581530A, a starting circuit and control mode of a microwave oven and refrigerator combination machine are mentioned, which includes a microwave oven magnetron, a refrigerator compressor sharing a power plug, and a computer control board IC provided with a logic control unit. The magnetron and the compressor are connected with the power supply through the normally open contact and the normally closed contact of the power supply relay switch K1 respectively, and the power supply relay coil KA1 is connected with the computer control board. It can avoid the simultaneous starting of the two high-power electrical components, the magnetron and the compressor, and reduce the phenomenon of the electric brake jumping in the user circuit caused by the simultaneous starting. However, because the circuit is used to realize the starting of the microwave oven and refrigerator combination machine, it cannot solve the demand of the electrical connection circuit of the single microwave oven, and using the circuit in the single microwave oven easily increases the cost of the circuit and improves the complexity of the circuit. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims at providing a built-in circuit and microwave oven to solve the problems of the electrical connection circuit in the prior art, such as meeting the UL and CUL standards, having a relatively complex structure, being relatively high in cost, and easily increasing the probability of burning the fuse during the opening process of the microwave oven. Thus, the setting of the circuit structure is simplified, the safety and reliability of the circuit are improved under the condition of meeting the UL and CUL standards, the cost of the circuit is reduced, the probability of burning the fuse of the circuit is reduced, and the stability of the circuit is improved.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The utility model relates to a kind of built-in circuit and microwave oven, the built-in circuit includes noise filter, temperature controller, main control module, numerical control circuit and transformer, one end of noise filter is connected with commercial power through plug, the other end of noise filter is connected with main control module, numerical control circuit, the one end of stove lamp L1 in microwave oven respectively through temperature controller, numerical control circuit, the other end of stove lamp L1 are all connected with main control module, main control module is connected with magnetron through transformer.

[0007] Further, the plug is a triangular power plug.

[0008] Further, the fire line L of commercial power, zero line N are connected with noise filter respectively through the pin 1,2 of triangular power plug, the ground wire E of commercial power is grounded through the pin 3 of triangular power plug.

[0009] Further, noise filter includes fuse FUSE, one end of fuse FUSE is connected with the pin 1 of plug, the other end of fuse FUSE is connected with main control module, numerical control circuit, stove lamp L1 respectively through temperature controller.

[0010] Further, main control module includes first interlock switch, first relay and second relay;One end of first interlock switch is connected with temperature controller, one end of stove lamp L1 respectively, the other end of first interlock switch is connected with fan motor FM, one end of turntable motor TM, coil of first relay, transformer respectively through contact of first relay, the other end of stove lamp L1, fan motor FM, turntable motor TM is connected with numerical control circuit through second relay;The coil of first relay is arranged on numerical control circuit.

[0011] Further, the contact of second relay is connected with coil, the contact of second relay is arranged in main control module, the coil of second relay is arranged on numerical control circuit.

[0012] Further, main control module further includes thermal protector, one end of thermal protector is connected with one end of turntable motor TM close to first relay, the other end of thermal protector is connected with one end of transformer input side, the other end of transformer input side is connected with second relay, numerical control circuit, noise filter respectively.

[0013] Further, main control module further includes monitoring switch and second interlock switch;One end of monitoring switch is connected with the contact of first relay away from one end of first interlock switch, the other end of monitoring switch is arranged between the contact of second relay and transformer;Monitoring switch is connected with second interlock switch, second interlock switch is arranged on numerical control circuit.

[0014] Further, the numerical control circuit comprises a power supply and a numerical control circuit board, the power supply, coils of the first and second relays and the second interlocking switch are arranged on the numerical control circuit board; one end of the power supply is arranged between the temperature controller and the first interlocking switch, and the other end of the power supply is arranged between the noise filter and the contact of the second relay.

[0015] A microwave oven comprises the built-in circuit.

[0016] Compared with the prior art, the built-in circuit and the microwave oven have the following beneficial effects:

[0017] Through the arrangement of the built-in circuit, the circuit structure can be simplified, the safety and reliability of the circuit can be improved, the cost of the circuit can be reduced, the probability of burning of the circuit fuse can be reduced, and the stability of the circuit can be improved under the condition of meeting the UL and CUL standards. BRIEF DESCRIPTION OF DRAWINGS

[0018] Some of the figures included in the present application are intended to provide a further understanding of the present application, and the exemplary embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 It is a schematic diagram of the built-in circuit.

[0020] Reference signs: 1, noise filter; 2, temperature controller; 3, main control module; 31, first interlocking switch; 32, first relay; 33, second relay; 34, thermal protector; 35, monitoring switch; 36, second interlocking switch; 4, numerical control circuit; 5, transformer. DETAILED DESCRIPTION

[0021] The utility model concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the substance of their work to other skilled persons in the art. However, these utility model concepts can be embodied in many different forms, and therefore should not be considered limited to the embodiments described herein.

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0023] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] The present embodiment is directed to a microwave oven, which is the same as a conventional microwave oven in that the overall structure is composed of a door, a cavity and a magnetron.

[0025] In order to solve the problems of the prior art, such as the electrical connection circuit satisfying the UL and CUL standards simultaneously, the structure is relatively complex, the cost is relatively high, and the probability of burning the fuse of the microwave oven during the door opening process is increased; the embodiment provides an internal circuit and a microwave oven, the internal circuit comprises a noise filter 1, a temperature controller 2, a main control module 3, a numerical control circuit 4 and a transformer 5, one end of the noise filter 1 is connected with the mains through a plug, the other end of the noise filter 1 is connected with the main control module 3, the numerical control circuit 4 and one end of a lamp L1 in the microwave oven through the temperature controller 2 respectively, the other end of the numerical control circuit 4 and the other end of the lamp L1 are connected with the main control module 3, and the main control module 3 is connected with a magnetron through the transformer 5. The plug is a triangular power plug, the live wire L and the neutral wire N of the mains are connected with the noise filter 1 through the pins 1 and 2 of the triangular power plug respectively, and the ground wire E of the mains is grounded through the pin 3 of the triangular power plug. The noise filter 1 is a filter module.

[0026] Through the setting of the circuit, the circuit structure can be effectively simplified, the safety and reliability of the circuit can be improved, the cost of the circuit can be reduced, the probability of burning the fuse of the circuit can be reduced, and the stability of the circuit can be improved. In addition, for the UL standard, the microwave cannot be started in the zero fire line normal state and the zero fire line reverse polarity state, and the circuit can meet the requirements. For the CUL standard, the controlled loop cannot have a switch, and the application can also meet the requirements. Therefore, it can be seen that the application can satisfy the UL and CUL standards, is also beneficial to save the use of relays, reduce the cost consumption of the circuit, and is more beneficial to greatly reduce the probability of burning the fuse of the whole machine.

[0027] The noise filter 1 comprises a fuse FUSE, one end of the fuse FUSE is connected with the pin 1 of the plug, and the other end of the fuse FUSE is connected with the main control module 3, the numerical control circuit 4 and the lamp L1 through the temperature controller 2.

[0028] Through the setting of the fuse FUSE in the noise filter 1, the protection of the circuit is improved, the influence of interference on the circuit is avoided, and the safety of the circuit is improved.

[0029] The main control module 3 comprises a first interlocking switch 31, a first relay 32 and a second relay 33. One end of the first interlocking switch 31 is connected with the temperature controller 2 and one end of the lamp L1 respectively, and the other end of the first interlocking switch 31 is connected with the fan motor FM, one end of the turntable motor TM, the coil of the first relay 32 and the transformer 5 through the contact of the first relay 32 respectively, and the other end of the lamp L1, the fan motor FM and the turntable motor TM is connected with the numerical control circuit 4 through the second relay 33; the coil of the first relay 32 is arranged on the numerical control circuit 4. The contact of the second relay 33 is connected with the coil, the contact of the second relay 33 is arranged in the main control module 3, and the coil of the second relay 33 is arranged on the numerical control circuit 4. Specifically, one end of the contact of the second relay 33 is connected with the end of the lamp L1 away from the temperature controller 2, and the other end of the contact of the second relay 33 is connected with the pin 2 of the plug through the noise filter 1.

[0030] Through the cooperation of the first interlocking switch 31, the first relay 32 and the second relay 33, the precision of the circuit control load operation can be improved, and the flexible regulation and control of the circuit to the fan and the turntable switch can be effectively realized, and the safety and reliability of the load in the microwave oven can be improved.

[0031] The main control module 3 further comprises a thermal protector 34, one end of the thermal protector 34 is connected with one end of the turntable motor TM close to the first relay 32, and the other end of the thermal protector 34 is connected with one end of the input side of the transformer 5, and the other end of the input side of the transformer 5 is connected with the second relay 33, the numerical control circuit 4 and the noise filter 1 respectively. One end of the output side of the transformer 5 is connected with the pin F of the magnetron, and the other end of the output side of the transformer 5 is grounded.

[0032] Through the setting of the thermal protector 34, the safety and reliability of the circuit can be further ensured, the phenomenon of the whole machine circuit fuse being burned can be avoided, and the opening or closing operation can be performed in time according to the high or low temperature of the circuit, so that the stable operation of the circuit can be ensured.

[0033] The main control module 3 further comprises a monitoring switch 35 and a second interlocking switch 36. One end of the monitoring switch 35 is connected with the contact of the first relay 32 away from one end of the first interlocking switch 31, and the other end of the monitoring switch 35 is arranged between the contact of the second relay 33 and the transformer 5. The monitoring switch 35 is connected with the second interlocking switch 36, and the second interlocking switch 36 is arranged on the numerical control circuit 4.

[0034] Through the setting of the monitoring switch 35 and the second interlocking switch 36, the real-time monitoring of the working state of the circuit can be realized, and the stable operation of the circuit can be ensured.

[0035] The numerical control circuit 4 comprises a power supply and a numerical control circuit board, and the power supply, the coils of the first relay 32 and the second relay 33 and the second interlocking switch 36 are arranged on the numerical control circuit board.

[0036] Through the arrangement of the power supply in the numerical control circuit 4, the alternating current can be converted into direct current to supply power to the circuit on the numerical control circuit board of the numerical control circuit 4, and the power supply can be charged under normal power supply.

[0037] The circuit further comprises a capacitor and a diode, the capacitor is arranged between the output side of the transformer 5 and the pin F of the magnetron, the positive electrode of the diode is connected to the end of the capacitor close to the magnetron, and the negative electrode of the diode is grounded.

[0038] Through the arrangement of the capacitor and the diode, the safety and reliability of the circuit can be effectively improved, the safety of the circuit is ensured, and the service life of the circuit is prolonged.

[0039] Working principle: the live wire L of the power supply is input into the built-in circuit, and forms a complete loop through the filtering module, i.e. the noise filter 1, the temperature controller 2, the first interlocking switch 31, the first relay 32, the transformer 5 and the zero line N, wherein one end of the furnace lamp L1 is connected to one side of the first interlocking switch 31, the other end of the furnace lamp L1 is connected to one end of the second relay 33, the two ends of the fan motor FM and the turntable motor TM connected in parallel are connected to one end of the first relay 32 and one end of the second relay 33 respectively, the other end of the second relay 33 is connected to the zero line, one end of the monitoring switch 35 is connected to one end of the first relay 32, and the other end of the monitoring switch 35 is connected to the zero line.

[0040] A microwave oven comprises the built-in circuit.

[0041] In the utility model, for any microwave oven, the built-in circuit and the microwave oven structure can be included, and the microwave oven further comprises conventional components such as a furnace door, a furnace cavity and a magnetron on the basis of the related structure and assembly relationship of the power supply and the temperature controller 2 provided in the embodiment.

[0042] The above merely describes preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An in-circuit, characterized in that, The utility model relates to a microwave oven, which comprises a noise filter (1), a temperature controller (2), a main control module (3), a numerical control circuit (4) and a transformer (5), one end of the noise filter (1) is connected with the mains through a plug, the other end of the noise filter (1) is connected with the main control module (3), the numerical control circuit (4) and one end of a lamp L1 in the microwave oven through the temperature controller (2), the numerical control circuit (4) and the other end of the lamp L1 are both connected with the main control module (3), and the main control module (3) is connected with a magnetron through the transformer (5).

2. An internal circuit according to claim 1, wherein The plug is a triangular power plug.

3. An internal circuit according to claim 2, wherein The live wire L and the zero wire N of the mains are connected with the noise filter (1) through the pins 1 and 2 of the triangular power plug respectively, and the ground wire E of the mains is grounded through the pin 3 of the triangular power plug.

4. An internal circuit according to claim 3, wherein The noise filter (1) comprises a fuse FUSE, one end of the fuse FUSE is connected with the pin 1 of the plug, and the other end of the fuse FUSE is connected with the main control module (3), the numerical control circuit (4) and the lamp L1 through the temperature controller (2).

5. An internal circuit according to claim 1, wherein The main control module (3) comprises a first interlocking switch (31), a first relay (32) and a second relay (33), one end of the first interlocking switch (31) is connected with the temperature controller (2) and one end of the lamp L1 respectively, the other end of the first interlocking switch (31) is connected with a fan motor FM, one end of a turntable motor TM, a coil of the first relay (32) and the transformer (5) through the contact of the first relay (32) respectively, the other end of the lamp L1, the fan motor FM and the turntable motor TM are connected with the numerical control circuit (4) through the second relay (33), and the coil of the first relay (32) is arranged on the numerical control circuit (4).

6. An internal circuit according to claim 5, wherein The contact of the second relay (33) is connected with the coil, the contact of the second relay (33) is arranged in the main control module (3), and the coil of the second relay (33) is arranged on the numerical control circuit (4).

7. An internal circuit according to claim 5, wherein The main control module (3) further comprises a thermal protector (34), one end of the thermal protector (34) is connected with one end of the turntable motor TM close to the first relay (32), the other end of the thermal protector (34) is connected with one end of an input side of the transformer (5), the other end of the input side of the transformer (5) is connected with the second relay (33), the numerical control circuit (4) and the noise filter (1) respectively.

8. An internal circuit according to claim 5, wherein The main control module (3) further comprises a monitoring switch (35) and a second interlocking switch (36), one end of the monitoring switch (35) is connected with the contact of the first relay (32) away from one end of the first interlocking switch (31), the other end of the monitoring switch (35) is arranged between the contact of the second relay (33) and the transformer (5), the monitoring switch (35) is connected with the second interlocking switch (36), and the second interlocking switch (36) is arranged on the numerical control circuit (4).

9. An internal circuit according to claim 8, wherein The numerical control circuit (4) comprises a power supply and a numerical control circuit board, the power supply, the coils of the first relay (32) and the second relay (33) and the second interlocking switch (36) are arranged on the numerical control circuit board; one end of the power supply is arranged between the temperature controller (2) and the first interlocking switch (31), and the other end of the power supply is arranged between the noise filter (1) and the contact of the second relay (33).

10. A microwave oven characterized by comprising: The microwave oven comprises a built-in circuit according to any one of claims 1-9, and the circuit is arranged in the microwave oven.

Images