Electric appliance system

Abstract

The utility model provides an electric appliance system, relates to the technical field of household appliances, and aims to enable the maximum power line current of the household appliances to be kept within the range specified by the national standard. The electric appliance system comprises a first electric device, a second electric device and a power protection device. The power protection device comprises a main control chip, a first protection circuit and a second protection circuit. The input end of the first protection circuit is electrically connected with the first pin of the main control chip, the input end of the second protection circuit is electrically connected with the first pin of the main control chip, the output end of the first protection circuit is electrically connected with the first electric equipment, and the output end of the second protection circuit is electrically connected with the second electric equipment. The first protection circuit is configured to enable the first electric equipment to be powered on under the condition that the first signal is received. And the second protection circuit is configured to electrify the second electric equipment under the condition that the second signal is received.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an electrical system. Background Art

[0002] People cannot do without household appliances in daily life. The national standard stipulates that the maximum power cord current of household appliances is 16A.

[0003] In order to meet the personalized needs of different users, manufacturers often integrate loads with different functions in household appliances. When all these loads are enabled, it is very likely that the power cord current will exceed the 16A stipulated by the national standard.

[0004] In this case, it is very likely to cause a trip, which greatly affects the user experience. Summary of the Utility Model

[0005] An embodiment of the utility model provides an electrical system, aiming to keep the maximum power cord current of household appliances within the range stipulated by the national standard.

[0006] To achieve the above object, the embodiment of the utility model adopts the following technical solutions:

[0007] The electrical system provided by the utility model includes: a first electrical device, a second electrical device, and a power protection device. Among them, the power protection device includes: a main control chip, a first protection circuit, and a second protection circuit. The input end of the first protection circuit is electrically connected to the first pin of the main control chip, the input end of the second protection circuit is electrically connected to the first pin of the main control chip, the output end of the first protection circuit is electrically connected to the first electrical device, and the output end of the second protection circuit is electrically connected to the second electrical device. The first protection circuit is configured to energize the first electrical device when receiving a first signal. The second protection circuit is configured to energize the second electrical device when receiving a second signal.

[0008] The first protection circuit is connected to the first electrical device, and the second protection circuit is connected to the second electrical device. Only when the first protection circuit receives the first signal will the first electrical device work, and only when the second protection circuit receives the second signal will the second electrical device work. The main control chip is connected to the input ends of the first protection circuit and the second protection circuit. Since the main control chip can only output the first signal or the second signal, the situation where the first electrical device and the second electrical device work simultaneously will not occur, which to a certain extent reduces the possibility that the power cord current exceeds the national standard.

[0009] As a possible implementation, the first protection circuit includes a first switching transistor and a first relay. The first relay includes a first coil and a first contact switch. The control electrode of the first switching transistor is electrically connected to the input end of the first protection circuit. The first pole of the first switching transistor is electrically connected to the first end of the first coil. The second end of the first coil is electrically connected to the second voltage terminal. The second pole of the first switching transistor is electrically connected to the first voltage terminal. The first contact switch includes a first contact, a second contact, a third contact, and a first switch paddle. The first end of the first switch paddle is connected to the first contact. The first contact is electrically connected to the third voltage terminal. The second end of the first switch paddle is connected to the second contact. The second contact is electrically connected to the first voltage terminal. The second end of the first switch paddle is electrically connected to the third contact when the first coil is energized. The third contact is electrically connected to the output end of the first protection circuit.

[0010] As a possible implementation, the first protection circuit further includes a first diode. The first pole of the first switching transistor is electrically connected to the anode of the first diode. The cathode of the first diode is electrically connected to the second voltage terminal. The first end of the first coil is electrically connected to the anode of the first diode. The second end of the first coil is electrically connected to the cathode of the first diode.

[0011] As a possible implementation, the second protection circuit further includes a second switching transistor and a second relay. The second relay includes a second coil and a second contact switch. The control electrode of the second switching transistor is electrically connected to the input end of the second protection circuit. The first pole of the second switching transistor is electrically connected to the second voltage terminal. The second pole of the second switching transistor is electrically connected to the first end of the second coil. The second end of the second coil is electrically connected to the first voltage terminal. The second contact switch includes a fourth contact, a fifth contact, a sixth contact, and a second switch paddle. The first end of the second switch paddle is electrically connected to the fourth contact. The fourth contact is electrically connected to the fourth voltage terminal. The second end of the second switch paddle is electrically connected to the fifth contact. The second end of the second switch paddle is electrically connected to the sixth contact when the second coil is energized. The sixth contact is electrically connected to the output end of the second protection circuit.

[0012] As a possible implementation, the second protection circuit further includes a second diode. The second pole of the second switching transistor is electrically connected to the cathode of the second diode. The anode of the second diode is electrically connected to the first voltage terminal. The first end of the second coil is electrically connected to the cathode of the second diode. The second end of the second coil is electrically connected to the anode of the second diode.

[0013] As a possible implementation, the electrical system is an electrical appliance. The first electrical device is at least one electrical functional component in the electrical appliance. The second electrical device is at least one electrical functional component of the electrical appliance. Alternatively, the electrical system is a lumped set of multiple electrical appliances. The first electrical device is at least one electrical appliance in the lumped set of multiple electrical appliances. The second electrical device is at least one electrical appliance in the lumped set of multiple electrical appliances.

[0014] As a possible implementation, the first signal is a high-level signal, the second signal is a low-level signal, the first switching transistor is an NPN-type triode, and the second switching transistor is a PNP-type triode.

[0015] As a possible implementation, the first signal is a positive voltage signal, the second signal is a negative voltage signal, the first switching transistor is an NMOS-type transistor, and the second switching transistor is a PMOS-type transistor.

[0016] As a possible implementation, the first protection circuit further includes a first resistor, a second resistor, and a third resistor. The first end of the first resistor is electrically connected to the input end of the first protection circuit, and the second end of the first resistor is electrically connected to the control electrode of the first switching transistor. The first end of the second resistor is electrically connected to the control electrode of the first switching transistor, and the second end of the second resistor is electrically connected to the first voltage terminal. The first end of the third resistor is electrically connected to the second voltage terminal, and the second end of the third resistor is electrically connected to the cathode of the first diode.

[0017] As a possible implementation, the second protection circuit further includes a fourth resistor, a fifth resistor, and a sixth resistor. The first end of the fourth resistor is electrically connected to the input end of the second protection circuit, and the second end of the fourth resistor is electrically connected to the control electrode of the second switching transistor. The first end of the fifth resistor is electrically connected to the second voltage terminal, and the second end of the fifth resistor is electrically connected to the control electrode of the second switching transistor. The first end of the sixth resistor is electrically connected to the second electrode of the second switching transistor, and the second end of the sixth resistor is electrically connected to the cathode of the second diode. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0019] Figure 1 It is a schematic diagram of the composition of a power protection device provided by an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of the working process of a power protection device provided by an embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of the composition of a first relay provided by an embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the connection of a first protection circuit provided by an embodiment of the present application;

[0023] Figure 5 It is another schematic diagram of the connection of a first protection circuit provided by an embodiment of the present application;

[0024] Figure 6 Schematic diagram of the composition of a second relay provided by an embodiment of the present application;

[0025] Figure 7 Schematic diagram of the connection of a second protection circuit provided by an embodiment of the present application;

[0026] Figure 8 Another schematic diagram of the connection of a second protection circuit provided by an embodiment of the present application;

[0027] Figure 9 Another schematic diagram of the connection of a first protection circuit provided by an embodiment of the present application;

[0028] Figure 10 Another schematic diagram of the connection of a first protection circuit provided by an embodiment of the present application;

[0029] Figure 11 Another schematic diagram of the connection of a first protection circuit provided by an embodiment of the present application;

[0030] Figure 12 Another schematic diagram of the connection of a second protection circuit provided by an embodiment of the present application;

[0031] Figure 13 Another schematic diagram of the connection of a second protection circuit provided by an embodiment of the present application;

[0032] Figure 14 Another schematic diagram of the connection of a second protection circuit provided by an embodiment of the present application. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0036] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, when describing the pipeline, the "connected" and "connection" used in the present utility model have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0037] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0038] Household appliances are indispensable in people's daily life. The copper core wire specified in the national standard GB4706.1-1992 / 1998 has a cross-sectional area of ​​1.5mm 2 In this case, the current allowed to flow for a long time is about 16A, and household appliances usually use wires with a cross-sectional area of ​​1.5mm 2 Copper core wire for connection.

[0039] However, as people's living standards improve, the types and quantities of household appliances are increasing. For example, the living room is equipped with high-definition TVs, projectors, Bluetooth speakers, computers, massage chairs and other electrical appliances. Another example is the kitchen is equipped with dishwashers, electric ovens, refrigerators, air fryers and other electrical appliances.

[0040] In addition, in order to meet the personalized needs of different users, manufacturers often integrate loads with different functions in home appliances. For example, the dishwasher is integrated with the function of a Bluetooth speaker and can act as a music player. For another example, the oven is integrated with the function of taking photos or recording videos, so that users can observe the process of food gradually becoming cooked, and provide materials for users who are willing to share their lives. However, if all functions of the electrical equipment are turned on, the actual power will increase. When the voltage is stable, the current will increase with the increase in the number of functions of the electrical equipment turned on.

[0041] In such a case, it is very likely that the current in the power cord will exceed 16A specified by the national standard, resulting in a tripping, which greatly affects the user experience. In severe cases, it may even cause damage to the circuit and pose a potential threat to the user's health.

[0042] In view of this, an embodiment of the present utility model provides an electrical appliance system, which includes a power protection device, aiming to keep the maximum current in the power cord of household appliances within the range specified by the national standard. Exemplarily, as shown in FIG. 1, Figure 1 shows the composition of the power protection device.

[0043] Referring to Figure 1 , the power protection device 100 includes a main control chip 1. The main control chip 1 is a bridge connecting various electrical devices and also the brain controlling the operation of various electrical devices. The main control chip 1 is configured to issue a first signal or a second signal. Depending on the signal issued by the main control chip 1, the operating electrical devices are different accordingly.

[0044] The power protection device 100 further includes a first protection circuit 2. The input terminal 2-1 of the first protection circuit 2 is electrically connected to the first pin of the main control chip 1, and the output terminal 2-2 of the first protection circuit 2 is electrically connected to the first electrical device 4. The first protection circuit 2 is configured to energize the first electrical device 4 when receiving the first signal.

[0045] The power protection device 100 further includes a second protection circuit 3. The input terminal 3-1 of the second protection circuit 3 is electrically connected to the first pin of the main control chip 1, and the output terminal 3-2 of the second protection circuit 3 is electrically connected to the second electrical device 5. The second protection circuit 3 is configured to energize the second electrical device when receiving the second signal.

[0046] It should be noted that the first electrical device can be a series and / or parallel connection of multiple electrical devices, and the second electrical device can also be a series and / or parallel connection of multiple electrical devices. The first electrical device can be an electrical device that turns on multiple functional loads, and the second electrical device can also be an electrical device that turns on multiple functional loads. The present application does not limit it.

[0047] The working flow chart of the power protection device is as shown in Figure 2 . Referring to Figure 2 and combining with Figure 1It can be seen that the first protection circuit 2 is connected to the first electrical device 4, and the second protection circuit 3 is connected to the second electrical device 5. Only when the first protection circuit 2 receives the first signal will the first electrical device 4 work, and only when the second protection circuit 3 receives the second signal will the second electrical device 5 work. The main control chip 1 is connected to the input terminal 2-1 of the first protection circuit 2 and the input terminal 3-1 of the second protection circuit 3. Since the main control chip 1 can only output the first signal or the second signal, the situation where the first electrical device 4 and the second electrical device 5 work simultaneously will not occur, which to a certain extent reduces the possibility that the power line current exceeds the national standard regulations.

[0048] Further, the first protection circuit includes a first relay, and the composition of the first relay is as Figure 3 shown. Referring to Figure 3 , the first relay 21 includes a first coil 211 and a first contact switch 212. The first contact switch 212 includes a first contact 2121, a second contact 2122, a third contact 2123, and a first switch paddle 2124. When the first coil 211 of the first relay 21 is not energized, both ends of the first switch paddle 2124 are respectively connected to the first contact 2121 and the second contact 2122. When the first coil 211 is energized, the end of the first switch paddle 2124 connected to the second contact 2122 switches to the third contact 2123.

[0049] As a possible implementation, the first protection circuit further includes a switching tube, for example, as Figure 4 shown, Figure 4 shows the connection of the first protection circuit. Referring to Figure 4 , the control electrode of the first switching tube 22 is electrically connected to the input terminal 2-1 of the first protection circuit 2, the first pole of the first switching tube 22 is electrically connected to the first end 211-1 of the first coil 211, the second end 211-2 of the first coil 211 is connected to the second voltage terminal VCC. The second pole of the first switching tube 22 is connected to the first voltage terminal GND. The first end of the first switch paddle 2124 is connected to the first contact 2121, the first contact 2121 is connected to the third voltage terminal VSS, the second end of the first switch paddle 2124 is connected to the second contact 2122, the second contact 2122 is connected to the first voltage terminal GND, and the second end of the first switch paddle 2124 is electrically connected to the third contact 2123 when the first coil 211 is energized, and the third contact 2123 is connected to the output terminal 2-2 of the first protection circuit 2.

[0050] When the first signal is received at the input terminal 2-1 of the first protection circuit 2, the first switching transistor 22 is switched from the cut-off state to the conducting state, and the first coil 211 is thus energized. After the first coil 211 is energized, the second end of the first switch paddle 2124 is switched from the second contact 2122 to the third contact 2123 through electromagnetic induction. Since the third contact 2123 is electrically connected to the output terminal 2-2 of the first protection circuit 2, and the output terminal 2-2 of the first protection circuit 2 is electrically connected to the first electrical device 4, the first electrical device 4 is energized and starts to operate.

[0051] When the first signal is not received at the input terminal 2-1 of the first protection circuit 2, that is, when the second signal is received, the first switching transistor 22 is in the cut-off state and the first coil 211 is not energized. Since the first coil 211 is not energized, the second end of the first switch paddle 2124 remains connected to the second contact 2122, and the first electrical device 4 cannot form a current loop, so it does not enter the working state.

[0052] As a possible implementation, as Figure 5 shown, the first protection circuit 2 further includes a first diode 23. The first pole of the first switching transistor 22 is electrically connected to the anode of the first diode 23, and the cathode of the first diode 23 is electrically connected to the second voltage terminal VCC. The first end 211-1 of the first coil 211 is electrically connected to the anode of the first diode 23, and the second end 211-2 of the first coil 211 is electrically connected to the cathode of the first diode 23.

[0053] Since the diode has the characteristic of unidirectional conduction, that is, the current can only flow from the anode of the diode to the cathode of the diode. When the first signal is received at the input terminal 2-1 of the first protection circuit 2, the first switching transistor 22 is switched from the cut-off state to the conducting state. Due to the unidirectional conduction characteristic of the first diode 23, the current can only flow through the first coil 211, the first switching transistor 22 and then to the first voltage terminal GND. The setting of the first diode 23 can effectively protect the stability of the first protection circuit 2.

[0054] In some embodiments, the second protection circuit includes a second relay, as Figure 6 shown, Figure 6 shows the composition of the second relay. Referring to Figure 6, the second relay 31 includes a second coil 311 and a second contact switch 312. The second contact switch 312 includes a fourth contact 3121, a fifth contact 3122, a sixth contact 3123, and a second switch paddle 3124. When the second coil 311 is not powered on, both ends of the second switch paddle 3124 are respectively connected to the fourth contact 3121 and the fifth contact 3122. After the second coil 311 is powered on, the end of the second switch paddle 3124 connected to the fifth contact 3122 switches to the sixth contact 3123.

[0055] As a possible implementation, as Figure 7 shown, Figure 7 shows the connection of the second protection circuit. Referring to Figure 7 , the second protection circuit 3 further includes a second switching transistor 32. The control electrode of the second switching transistor 32 is electrically connected to the input terminal 3-1 of the second protection circuit 3. The first electrode of the second switching transistor 32 is electrically connected to the second voltage terminal VCC. The second electrode of the second switching transistor 32 is electrically connected to the first end 311-1 of the second coil 311. The second end 311-2 of the second coil 311 is electrically connected to the first voltage terminal GND. The first end of the second switch paddle 3124 is electrically connected to the fourth contact 3121. The fourth contact is electrically connected to the fourth voltage terminal VDD. The second end of the second switch paddle 3124 is electrically connected to the fifth contact 3122. The second end of the second switch paddle 3124 is electrically connected to the sixth contact 3123 when the second coil 311 is powered on. The sixth contact 3123 is electrically connected to the output terminal 3-2 of the second protection circuit 3.

[0056] When the second signal is received at the input terminal 3-1 of the second protection circuit 3, the second switching transistor 32 changes from the cut-off state to the conducting state, and the second coil 311 is thus powered on. After the second coil 311 is powered on, the second end of the second switch paddle 3124 is switched from the fifth contact 3122 to the sixth contact 3123 through electromagnetic induction. Since the sixth contact 3123 is electrically connected to the output terminal 3-2 of the second protection circuit 3, and the output terminal 3-2 of the second protection circuit 3 is electrically connected to the second electrical device 5, the second electrical device 5 is powered on and starts to operate.

[0057] When the second signal is not received at the input terminal 3-1 of the second protection circuit 3, that is, when the first signal is received, the second switching transistor 32 is in the cut-off state, and the second coil 311 is not powered on. Since the second coil 311 is not powered on, the second end of the second switch paddle 3124 remains connected to the fifth contact 3122, and the second electrical device 5 cannot form a current loop, so it does not enter the working state.

[0058] As a possible implementation, as Figure 8As shown, the second protection circuit 3 further includes a second diode 33. The second pole of the second switching transistor 32 is electrically connected to the cathode of the second diode 33, and the anode of the second diode 33 is electrically connected to the first voltage terminal GND. The first end 311-1 of the second coil 311 is electrically connected to the cathode of the second diode 33, and the second end 311-2 of the second coil 311 is electrically connected to the anode of the second diode 33.

[0059] Since the diode has the characteristic of unidirectional conduction, that is, the current can only flow from the anode of the diode to the cathode of the diode. When the second signal is received at the input terminal 3-1 of the second protection circuit 3, the second switching transistor 32 changes from the cut-off state to the conduction state. Due to the unidirectional conduction characteristic of the second diode 33, the current can only flow through the second switching transistor 32 and the second coil 311 and then to the first voltage terminal GND. The setting of the second diode 33 can effectively protect the stability of the second protection circuit 3.

[0060] In some embodiments, the first signal is a high-level signal, the second signal is a low-level signal, the first switching transistor is an NPN-type triode, and the second switching transistor is a PNP-type triode. When the first switching transistor is an NPN-type triode, the control electrode of the first switching transistor is the base of the NPN-type triode, the first pole of the first switching transistor is the collector of the NPN-type triode, and the second pole of the first switching transistor is the emitter of the PNP-type triode. When the second switching transistor is a PNP-type triode, the control electrode of the second switching transistor is the base of the PNP-type triode, the first pole of the second switching transistor is the collector of the PNP-type triode, and the second pole of the second switching transistor is the emitter of the PNP-type triode.

[0061] The NPN-type triode is a common-anode triode, that is, the P junctions of the two PN junctions are connected together as the base, and the remaining two N junctions are respectively used as the collector and the emitter. The PNP-type triode is a common-cathode triode, that is, the N junctions of the two PN junctions are connected together as the base, and the remaining two P junctions are respectively used as the collector and the emitter. Therefore, the conduction conditions of the NPN-type triode and the PNP-type triode are opposite. The NPN-type triode conducts when the input signal is a high level, and the PNP-type triode conducts when the input signal is a low level.

[0062] Therefore, when the control chip inputs the first signal, that is, the high-level signal, the high-level signal is input from the input terminal of the first protection circuit to the first switching transistor. Since the conduction condition of the first switching transistor, that is, the NPN-type triode, is satisfied, the first switching transistor changes from cut-off to conduction. Similarly, the high-level signal is input from the input terminal of the second protection circuit to the second switching transistor. Since the conduction condition of the second switching transistor, that is, the PNP-type triode, is not satisfied, the second switching transistor is cut off.

[0063] In some other embodiments, the first signal is a positive voltage signal, the second signal is a negative voltage signal, the first switching transistor is an NMOS transistor, and the second switching transistor is a PMOS transistor.

[0064] In the embodiments of the present application, the transistor may be a metal-oxide-semiconductor field effect transistor (MOSFET), including an N-type metal-oxide-semiconductor field effect transistor (negative-channel-mental-oxide semiconductor, NMOS) and a P-type metal-oxide-semiconductor field effect transistor (positive-channel-mental-oxide semiconductor, PMOS). Among them, NMOS is also called an N-type transistor, and PMOS is also called a P-type transistor. A transistor includes a source, a drain, and a gate. By controlling the level input to the gate of the transistor, the conduction or cutoff of the transistor can be controlled.

[0065] When the transistor is conducting, the source and the drain are conducting, generating a conduction current. Moreover, when the gate level of the transistor is different, the magnitude of the conduction current generated between the source and the drain is also different; when the transistor is cutoff, the source and the drain are not conducting and no current is generated. In addition, the N-type transistor conducts when the level of the control electrode is high, and the first electrode and the second electrode are conducting, generating a conduction current between the first electrode and the second electrode; the N-type transistor is cutoff when the level of the control terminal is low, and the first electrode and the second electrode are not conducting and no current is generated. The P-type transistor conducts when the level of the control electrode is low, and the first electrode and the second electrode are conducting, generating a conduction current; the P-type transistor is cutoff when the level of the control electrode is high, and the first electrode and the second electrode are not conducting and no current is generated.

[0066] When the first switching transistor is an NMOS transistor, the control electrode of the first switching transistor is the insulated gate of the NMOS transistor, the first electrode of the first switching transistor is the source of the NMOS transistor, and the second electrode of the first switching transistor is the drain of the NMOS transistor. When the second transistor is a PMOS transistor, the control electrode of the second switching transistor is the insulated gate of the PMOS transistor, the first electrode of the second switching transistor is the drain of the PMOS transistor, and the second electrode of the second switching transistor is the source of the PMOS transistor.

[0067] The source of an NMOS transistor is generally connected to a voltage terminal with a low potential, and the conduction condition of the NMOS transistor is that the voltage of the insulated gate is greater than the threshold voltage. Therefore, when the first signal is a positive voltage signal, the NMOS transistor conducts. The source of a PMOS transistor is generally connected to a voltage terminal with a high potential, and the conduction condition of the PMOS transistor is that the voltage of the insulated gate is greater than the threshold voltage. Therefore, when the second signal is a negative voltage, the PMOS transistor conducts.

[0068] As a possible implementation, as Figure 9 shown, the first protection circuit 2 further includes a first resistor 24. The first end of the first resistor 24 is electrically connected to the input terminal 2-1 of the first protection circuit 2, and the second end of the first resistor 24 is electrically connected to the control electrode of the first switching transistor 22.

[0069] As a possible implementation, as Figure 10 shown, the first protection circuit 2 further includes a second resistor 25. The first end of the second resistor 25 is electrically connected to the control electrode of the first switching transistor 22, and the second end of the second resistor 25 is electrically connected to the first voltage terminal GND.

[0070] As a possible implementation, as Figure 11 shown, the first protection circuit 2 further includes a third resistor 26. The first end of the third resistor 26 is electrically connected to the second voltage terminal VCC, and the second end of the third resistor 26 is electrically connected to the cathode of the first diode 23.

[0071] As a possible implementation, as Figure 12 shown, the second protection circuit 3 further includes a fourth resistor 34. The first end of the fourth resistor 34 is electrically connected to the input terminal 3-1 of the second protection circuit 3, and the second end of the fourth resistor 34 is electrically connected to the control electrode of the second switching transistor 32.

[0072] As a possible implementation, as Figure 13 shown, the second protection circuit 3 further includes a fifth resistor 35. The first end of the fifth resistor 35 is electrically connected to the second voltage terminal VCC, and the second end of the fifth resistor 35 is electrically connected to the control electrode of the second switching transistor 32.

[0073] As a possible implementation, as Figure 14 shown, the second protection circuit 3 further includes a sixth resistor 36. The first end of the sixth resistor 36 is electrically connected to the second electrode of the second switching transistor 32, and the second end of the sixth resistor 36 is electrically connected to the cathode of the second switching transistor 32.

[0074] In several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the first protection circuit and the second protection circuit is only a logical function division. In actual implementation, there can be other division methods. For example, multiple components inside the first protection circuit can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the connections or electrical connections shown or discussed with each other can be through some interfaces, such as the connections between the main control chip and the first protection circuit and the second protection circuit. The connections mentioned herein can be electrical, mechanical, or other forms.

[0075] It should be noted that the electrical system in this application can refer to specific household appliances. Household appliances include multiple electrical functional components, and electrical functional components are components in household appliances that require electricity to achieve corresponding functions. Taking a household appliance as an oven as an example, in this case, the oven can achieve functions such as heating food, lighting, and taking pictures. The oven includes components related to the heating function, components related to the lighting function, and components related to the taking pictures function, and these components all need to be powered on to operate.

[0076] The first electrical device is at least one electrical functional component in the electrical appliance, and the second electrical device is at least one electrical functional component of the electrical appliance, and the first electrical device and the second electrical device are not the same. The first electrical device and the second electrical device can be different functional components that require electricity in the oven. For example, the first electrical device is a functional component associated with the lighting function, and the second electrical device is a functional component associated with the camera function.

[0077] The electrical system in this application can also refer to the aggregation of multiple electrical appliances, such as smart home devices. In this case, the first electrical device and the second electrical device can be different household appliances. The first electrical device is at least one electrical appliance in the aggregation of multiple electrical appliances, and the second electrical device is at least one electrical appliance in the aggregation of multiple electrical appliances. For example, the first electrical device is a color TV, and the second electrical device is a refrigerator.

[0078] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present utility model should be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. An electrical system, characterized in that: The electrical system comprises: First electrical equipment; Second electrical equipment; A power protection device, the power protection device comprising: A main control chip, a first protection circuit and a second protection circuit; The input end of the first protection circuit is electrically connected to the first pin of the main control chip, the input end of the second protection circuit is electrically connected to the first pin of the main control chip, the output end of the first protection circuit is electrically connected to the first electrical device, and the output end of the second protection circuit is electrically connected to the second electrical device; The first protection circuit is configured to power on the first powered device when receiving a first signal; The second protection circuit is configured to power on the second powered device upon receiving a second signal.

2. The electrical system according to claim 1, characterized in that: The first protection circuit includes a first switch tube and a first relay; The first relay includes a first coil and a first contact switch; The control electrode of the first switch tube is electrically connected to the input end of the first protection circuit, the first electrode of the first switch tube is electrically connected to the first end of the first coil, and the second end of the first coil is electrically connected to the second voltage end; The second pole of the first switch tube is electrically connected to the first voltage end, the first contact switch includes a first contact, a second contact, a third contact and a first switch paddle, the first end of the first switch paddle is connected to the first contact, the first contact is electrically connected to the third voltage end, the second end of the first switch paddle is connected to the second contact, the second contact is electrically connected to the first voltage end, the second end of the first switch paddle is electrically connected to the third contact when the first coil is energized, and the third contact is electrically connected to the output end of the first protection circuit.

3. The electrical system according to claim 2, characterized in that: The first protection circuit also includes a first diode; The first electrode of the first switch tube is electrically connected to the anode of the first diode, and the cathode of the first diode is electrically connected to the second voltage end; A first end of the first coil is electrically connected to an anode of the first diode, and a second end of the first coil is electrically connected to a cathode of the first diode.

4. The electrical system according to claim 3, characterized in that: The second protection circuit also includes a second switch tube and a second relay; The second relay includes a second coil and a second contact switch; The control electrode of the second switch tube is electrically connected to the input end of the second protection circuit, the first electrode of the second switch tube is electrically connected to the second voltage end, the second electrode of the second switch tube is electrically connected to the first end of the second coil, and the second end of the second coil is electrically connected to the first voltage end; The second contact switch includes a fourth contact, a fifth contact, a sixth contact and a second switch paddle, the first end of the second switch paddle is electrically connected to the fourth contact, the fourth contact is electrically connected to a fourth voltage terminal, the second end of the second switch paddle is electrically connected to the fifth contact, the second end of the second switch paddle is electrically connected to the sixth contact when the second coil is energized, and the sixth contact is electrically connected to the output terminal of the second protection circuit.

5. The electrical system according to claim 4, characterized in that: The second protection circuit also includes a second diode; The second electrode of the second switch tube is electrically connected to the cathode of the second diode, and the anode of the second diode is electrically connected to the first voltage end; A first end of the second coil is electrically connected to a cathode of the second diode, and a second end of the second coil is electrically connected to an anode of the second diode.

6. The electrical system according to claim 1, characterized in that: The electrical system is an electrical appliance, the first electrical device is at least one electrical functional component in the electrical appliance, and the second electrical device is at least one electrical functional component of the electrical appliance; Alternatively, the electrical system is a collection of multiple electrical appliances, the first electrical device is at least one electrical appliance in the collection of multiple electrical appliances, and the second electrical device is at least one electrical appliance in the collection of multiple electrical appliances.

7. The electrical system according to claim 4, characterized in that: The first signal is a high-level signal, the second signal is a low-level signal, the first switch tube is an NPN-type transistor, and the second switch tube is a PNP-type transistor.

8. The electrical system according to claim 4, characterized in that: The first signal is a positive voltage signal, the second signal is a negative voltage signal, the first switch tube is an NMOS transistor, and the second switch tube is a PMOS transistor.

9. The electrical system according to claim 3, characterized in that: The first protection circuit further includes a first resistor, a second resistor and a third resistor; The first end of the first resistor is electrically connected to the input end of the first protection circuit, and the second end of the first resistor is electrically connected to the control electrode of the first switch tube; A first end of the second resistor is electrically connected to the control electrode of the first switch tube, and a second end of the second resistor is electrically connected to the first voltage end; A first end of the third resistor is electrically connected to the second voltage end, and a second end of the third resistor is electrically connected to the cathode of the first diode.

10. The electrical system according to claim 5, characterized in that: The second protection circuit further includes a fourth resistor, a fifth resistor and a sixth resistor; A first end of the fourth resistor is electrically connected to an input end of the second protection circuit, and a second end of the fourth resistor is electrically connected to a control electrode of the second switch tube; A first end of the fifth resistor is electrically connected to the second voltage end, and a second end of the fifth resistor is electrically connected to the control electrode of the second switch tube; The first end of the sixth resistor is electrically connected to the second electrode of the second switch tube, and the second end of the sixth resistor is electrically connected to the cathode of the second diode.

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