Abnormal self-correction circuit and electric appliance

Abstract

The utility model discloses an abnormity self-error correction circuit and an electric appliance, the abnormity self-error correction circuit comprises a to-be-controlled member, and also comprises a control circuit which is connected with the to-be-controlled member and is used for controlling the working state of the to-be-controlled member; the monitoring circuit is connected with the control circuit and used for monitoring whether the control circuit operates abnormally or not; and the error correction circuit is connected with the control circuit and is used for controlling the working state of the to-be-controlled piece when the control circuit operates abnormally. Compared with the prior art, whether the control circuit operates abnormally or not can be monitored, and when the control circuit operates abnormally, a piece to be controlled can be normally controlled to work, so that the operation reliability of an electric appliance is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrical fault control, and in particular to an abnormal self-correcting circuit and electrical appliance. Background Technology

[0002] Electric heaters are common components in electrical appliances. Conventional electric heaters are usually controlled by relays on a control panel to turn on and off. However, relays have a limited lifespan. If a relay becomes stuck and cannot disconnect or close, it will be unable to effectively control the electric heater, which may lead to a fire hazard or poor heating performance.

[0003] Therefore, how to design an abnormal self-correcting circuit and electrical appliance that can control the electric heater normally when the relay is abnormal is a technical problem that the industry urgently needs to solve. Utility Model Content

[0004] To address the problem that relay malfunctions cannot be effectively controlled in existing technologies, this utility model proposes an malfunction self-correcting circuit and electrical appliance.

[0005] The technical solution of this utility model is to propose an anomaly self-correction circuit, including a component to be controlled, and further comprising:

[0006] A control circuit, which is connected to the device to be controlled, is used to control the working state of the device to be controlled;

[0007] A monitoring circuit, which is connected to the control circuit, is used to monitor whether the control circuit is operating abnormally;

[0008] An error correction circuit, connected to the control circuit, is used to control the working state of the device to be controlled when the control circuit malfunctions.

[0009] Furthermore, the anomaly self-correction circuit also includes: a main control unit and a signal conditioning unit;

[0010] The main control unit is connected to the control circuit and the signal conditioning unit respectively, and is used to provide the same control signal to the control circuit and the signal conditioning unit;

[0011] The signal conditioning unit has at least two input terminals connected to the main control unit and the monitoring circuit, and two output terminals connected to the error correction circuit. The signal conditioning unit can output different feedback signals according to the control signal issued by the main control unit and the monitoring signal issued by the monitoring circuit. The feedback signals are used to control the working state of the error correction circuit.

[0012] Furthermore, the control circuit includes: a normally open relay K1;

[0013] The control terminal of the normally open relay K1 is connected to the main control unit. One end of the controlled terminal of the normally open relay K1 is connected to the first terminal of the power supply. The other end of the controlled terminal of the normally open relay K1 is connected to the first input terminal of the device to be controlled. The second input terminal of the device to be controlled is connected to the second terminal of the power supply.

[0014] Furthermore, the error correction circuit includes: normally open relay K2 and normally closed relay K3;

[0015] The control terminal of the normally closed relay K3 is connected to the first output terminal of the signal conditioning unit, and the controlled terminal of the normally closed relay K3 is connected in series between the controlled terminal of the normally open relay K1 and the first input terminal of the device to be controlled.

[0016] The control terminal of the normally open relay K2 is connected to the fourth output terminal of the signal conditioning unit. One end of the controlled terminal of the normally open relay K2 is connected between the controlled terminal of the normally open relay K1 and the first terminal of the power supply. The other end of the controlled terminal of the normally open relay K2 is connected between the controlled terminal of the normally closed relay K3 and the second input terminal of the device to be controlled.

[0017] Furthermore, the monitoring circuit includes: resistors R1, R2, R3, and R4; capacitor C1; diode D1; diode D2; and optocoupler U1.

[0018] The positive terminal of diode D1 is connected to the first input terminal of the device to be controlled, the negative terminal of diode D1 is connected to the first terminal of optocoupler U1, one end of resistor R1 is connected to the second input terminal of the device to be controlled, the other end of resistor R1 is connected to the second terminal of the device to be controlled, the negative terminal of diode D2 is connected between the negative terminal of diode D1 and the first terminal of optocoupler U1, and the positive terminal of diode D2 is connected between resistor R1 and the second terminal of optocoupler U1.

[0019] One end of resistor R2 is connected to the fourth terminal of optocoupler U1, and the other end of resistor R2 is connected to the first input terminal of the signal conditioning unit. One end of resistor R4 is connected to the third terminal of optocoupler U1, and the other end of resistor R4 is connected between resistor R2 and the first input terminal of the signal conditioning unit. One end of resistor R3 is connected between resistor R2 and the first input terminal of the signal conditioning unit, and the other end of resistor R3 is grounded. One end of capacitor C1 is connected between resistor R2 and the first input terminal of the signal conditioning unit, and the other end of capacitor C1 is grounded. An input power supply is also connected between resistor R4 and the third terminal of optocoupler U1.

[0020] Furthermore, the signal conditioning unit has four output modes, and the output modes of the signal conditioning unit are adjusted according to the received control signal and the monitoring signal. The feedback signal is different in different output modes.

[0021] Furthermore, the signal conditioning unit has a first input terminal for receiving the monitoring signal and a second input terminal for receiving the control signal;

[0022] When both the first input terminal and the second input terminal are input with low-level signals, the signal conditioning unit is in the first output mode;

[0023] When a low-level signal is input to the first input terminal and a high-level signal is input to the second input terminal, the signal conditioning unit is in the second output mode;

[0024] When a high-level signal is input to the first input terminal and a low-level signal is input to the second input terminal, the signal conditioning unit is in the third output mode;

[0025] When both the first input terminal and the second input terminal are input with a high-level signal, the signal conditioning unit is in the fourth output mode.

[0026] Furthermore, the signal conditioning unit has a first output terminal connected to the control terminal of the normally closed relay K3, a fourth output terminal connected to the control terminal of the normally open relay K2, and a third and fourth output terminals that are unused.

[0027] When the signal conditioning unit is in the first output mode, the first output terminal outputs a high-level signal, and the second output terminal, the third output terminal, and the fourth output terminal all output low-level signals.

[0028] When the signal conditioning unit is in the second output mode, the second output terminal outputs a high-level signal, and the first output terminal, the third output terminal, and the fourth output terminal all output low-level signals.

[0029] When the signal conditioning unit is in the third output mode, the third output terminal outputs a high-level signal, and the first output terminal, the second output terminal, and the fourth output terminal all output low-level signals.

[0030] When the signal conditioning unit is in the fourth output mode, the fourth output terminal outputs a high-level signal, and the first output terminal, the second output terminal, and the third output terminal all output low-level signals.

[0031] Furthermore, the signal conditioning unit is a binary decoder, and the component to be controlled is an electric heater.

[0032] This utility model also proposes an electrical appliance having the above-mentioned fault self-correction circuit.

[0033] Furthermore, the electrical appliance can be any one of an air conditioner, a water heater, or a washing machine.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] This invention includes a monitoring circuit that can monitor the control circuit for abnormalities in real time. If an abnormality occurs, a correction circuit ensures the control components function normally. When applied to the control of an electric heater, the correction circuit prevents problems such as the heater catching fire or failing to heat effectively. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is the circuit topology diagram of the fault self-correction circuit of this utility model;

[0038] Figure 2 This is a schematic diagram of the abnormal self-correction circuit of this utility model;

[0039] Figure 3 This is a schematic diagram of the output mode of the signal conditioning unit of this utility model. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0041] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0042] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0043] Currently, relays are widely used in electrical appliances. When a relay fails to function properly, such as failing to disconnect or close, it poses a significant safety hazard.

[0044] To address the above problems, this utility model proposes an anomaly self-correction circuit, which includes: a component to be controlled, and further includes:

[0045] A control circuit, which is connected to the device to be controlled, is used to control the working state of the device to be controlled;

[0046] The monitoring circuit, which is connected to the control circuit, is used to monitor whether the control circuit is operating abnormally.

[0047] Error correction circuit, which is connected to control circuit, is used to control the working state of the controlled component when the control circuit malfunctions.

[0048] The control circuit here is also the control circuit of the relay for the controlled component, which can be an electric heater. To solve the problems existing in the background technology of this utility model, based on the above circuit, the design idea of ​​this utility model is to determine whether the control circuit (i.e., whether the relay is malfunctioning) through the monitoring circuit. If the relay malfunctions, that is, it cannot disconnect or cannot close, then the error correction circuit assists in controlling the working state of the controlled component, thereby avoiding the problem of the controlled component malfunctioning and causing safety hazards.

[0049] As can be seen from the circuit design described above, this invention can monitor the control circuit for abnormalities in real time, and when an abnormality occurs, it ensures the normal operation of the controlled components through an error correction circuit. When applied to the control of electric heaters, the error correction circuit can prevent problems such as the electric heater catching fire and poor heating effect.

[0050] Furthermore, the anomaly self-correction circuit proposed in this utility model also includes:

[0051] Main control unit and signal conditioning unit;

[0052] The main control unit is connected to both the control circuit and the signal conditioning unit, and is used to provide the same control signal to both the control circuit and the signal conditioning unit.

[0053] The signal conditioning unit has at least two input terminals connected to the main control unit and the monitoring circuit, and two output terminals connected to the error correction circuit. The signal conditioning unit can output different feedback signals according to the control signals issued by the main control unit and the monitoring signals issued by the monitoring circuit. The feedback signals are used to control the working state of the error correction circuit.

[0054] Specifically, relays generally exhibit two abnormal states: inability to close and inability to open. Both abnormal states affect the operation of the controlled component, posing safety hazards. While the monitoring circuit in this invention can detect these two abnormal states and issue corresponding monitoring signals, different control methods are required for different abnormal states to ensure the normal operation of the controlled component. Therefore, this invention requires a corresponding signal conditioning unit to output different feedback signals based on the monitoring signals and the control signals issued by the main control unit. This enables different control states for the error correction circuit, ensuring normal control of the controlled component even when the relay fails to open or close.

[0055] For details, please see Figure 2 The circuit components of this utility model include the following parts: control circuit, control component (the control component here is also the component to be controlled mentioned above), error correction circuit, monitoring circuit, and MCU (the MCU here is also the main control unit mentioned above).

[0056] From the above appendix Figure 2 It is quite obvious that the error correction circuit receives signals from both the monitoring circuit and the MCU, which correspond to the control signal and monitoring signal mentioned above, respectively. The signal conditioning unit is located at the error correction circuit and can provide different feedback signals to the error correction circuit according to the monitoring signal and the control signal.

[0057] Further from the appendix Figure 2 As can be seen from this, the control section is simultaneously controlled by the control circuit and the error correction circuit, and from this... Figure 2 It is quite clear from the diagram that the control circuit controls the control component when the control circuit is functioning normally, while the error correction circuit controls the control component when the control circuit malfunctions. (This is in conjunction with the attached diagram.) Figure 2 From the signal flow, it is quite clear that the working principle of this utility model is as follows:

[0058] When the control circuit is normal, it controls the control components. At the same time, the monitoring circuit monitors the control circuit in real time to see if it is malfunctioning. The monitoring signal is sent together with the control signal sent by the MCU to the signal conditioning unit in the error correction circuit. The signal conditioning unit can send a feedback signal to the error correction circuit to control the control components to work when the control circuit is malfunctioning.

[0059] As can be clearly seen from the above working principle, the monitoring circuit in this invention can monitor the control circuit for abnormalities in real time, and when an abnormality occurs in the control circuit, the error correction circuit ensures the normal operation of the controlled component. When applied to the control of an electric heater, the error correction circuit can prevent problems such as the electric heater catching fire and poor heating effect.

[0060] The following is in conjunction with the appendix Figure 1 The specific circuit of this utility model will be analyzed and explained:

[0061] Please see Figure 1 The control circuit in this utility model includes: a normally open relay K1;

[0062] The control terminal of normally open relay K1 is connected to the main control unit. One end of the controlled terminal of normally open relay K1 is connected to the first terminal of the power supply. The other end of the controlled terminal of normally open relay K1 is connected to the first input terminal of the device to be controlled. The second input terminal of the device to be controlled is connected to the second terminal of the power supply.

[0063] Normally open relays are in the open state by default. When a normally open relay is energized, it will be in the closed state. The power supply in this invention is AC power (mainly for electrical appliances) by default, which has a live wire L and a neutral wire N. Power is applied only when the live wire L is connected to the component to be controlled (i.e., the accessory). Figure 1 When the electric heater in the middle is turned on, the control component can work normally, as described in the above appendix. Figure 1 It can be clearly seen that the controlled terminal of the normally open relay K1 of this utility model is connected in series between the first terminal of the power supply (i.e., the live wire L) and the device to be controlled. Therefore, the other terminal of the device to be controlled is directly connected to the second terminal of the power supply (i.e., the neutral wire N). Thus, the working state of the entire device to be controlled is completely controlled by the controlled terminal of the normally open relay K1. When the controlled terminal of the normally open relay K1 is closed, the device to be controlled is powered on and starts to work. Conversely, when the controlled terminal of the normally open relay K1 is open, the device to be controlled is powered off and stops working.

[0064] In other words, the design of the control circuit described above in this utility model can control the operation of the controlled component when the normally open relay K1 is in normal working order.

[0065] However, the normally open relay K1 may have problems such as failing to open or failing to close. Here, "failing to open" and "failing to close" both refer to the controlled end of the normally open relay K1. (See attached diagram.) Figure 1As can be seen, when the normally open relay K1 fails to close, the live wire L and the device to be controlled will remain disconnected, resulting in the device failing to function. Conversely, when the normally open relay K1 fails to open, the live wire L and the device to be controlled will remain connected, leading to the fire problem mentioned earlier.

[0066] The monitoring circuit and error correction circuit in this invention are included to solve the above-mentioned problems. For further details, please refer to [link to relevant documentation]. Figure 1 The error correction circuit in this utility model includes: normally open relay K2 and normally closed relay K3;

[0067] The control terminal of normally closed relay K3 is connected to the first output terminal of the signal conditioning unit, and the controlled terminal of normally closed relay K3 is connected in series between the controlled terminal of normally open relay K1 and the first input terminal of the device to be controlled.

[0068] The control terminal of normally open relay K2 is connected to the fourth output terminal of the signal conditioning unit. One end of the controlled terminal of normally open relay K2 is connected between the controlled terminal of normally open relay K1 and the first terminal of the power supply. The other end of the controlled terminal of normally open relay K2 is connected between the controlled terminal of normally closed relay K3 and the second input terminal of the device to be controlled.

[0069] From the above appendix Figure 1 It can be seen that the error correction circuit in this utility model actually adds two relays, namely normally open relay K2 and normally closed relay K3. (From the attached...) Figure 1 It can be seen that the controlled terminal of normally closed relay K3 is connected in series between the controlled terminal of normally open relay K1 and the first input terminal of the device to be controlled. In this configuration, for the device to be controlled to obtain power from the live wire L, it is necessary to simultaneously close the controlled terminals of normally open relay K1 and normally closed relay K3. For normally closed relay K3, its default state is closed. Thus, when normally open relay K1 is working normally, the controlled terminal of normally closed relay K3 is in the default state, which is closed. Therefore, the configuration of normally closed relay K3 will not affect the normal operation of normally open relay K1. When the normally open relay K1 fails to disconnect, and the controlled terminal of the normally open relay K1 cannot be disconnected, the controlled terminal of the normally closed relay K3 can be disconnected through the control of the main control unit and the signal conditioning unit. Since it is connected in series with the controlled terminal of the normally open relay K1, when the controlled terminal of the normally closed relay K3 is disconnected, it will also disconnect the connection between the live wire L and the first input terminal of the device to be controlled, thereby realizing the power-off control of the device to be controlled. That is, the normally closed relay K3 in this utility model can solve the problem that the normally open relay K1 cannot disconnect normally.

[0070] In addition, from the appendix Figure 1It can also be seen that the normally open relay K2 here is equivalent to adding a power supply line between the live wire L and the device to be controlled. When this power supply line is connected, it will also power on the device to be controlled. However, the default state of the normally open relay K2 is the open state, that is, the controlled end of the normally open relay K2 is in the open state by default. When the normally open relay K1 can be used normally, if it is not controlled, the power supply line cannot be connected, so it will not affect the normal control of the device to be controlled by the normally open relay K1. When the normally open relay K1 has a problem of not being able to close, it is impossible to supply power to the device to be controlled through the normally open relay K1. At this time, the normally open relay K2 can be controlled to close through the main control unit and the signal conditioning unit. At this time, the newly added power supply line at the normally open relay K2 is connected, and the live wire L can supply power to the device to be controlled normally, thereby ensuring the normal operation of the device to be controlled. That is, the normally open relay K2 in this utility model can solve the problem of the normally open relay K1 not being able to close.

[0071] In summary, by setting up the above-mentioned error correction circuit, this utility model can achieve normal control of the controlled component when the normally open relay K1 fails to disconnect or close, thus avoiding the problems pointed out in the prior art.

[0072] As mentioned above, in order to achieve the above control, the error correction circuit needs to energize the control terminal of the normally open relay K2 when the normally open relay K1 fails to close, thereby controlling the controlled terminal of the normally open relay K2 to close. When the normally open relay K1 fails to open, it needs to energize the control terminal of the normally closed relay K3, thereby controlling the controlled terminal of the normally closed relay K3 to open. Therefore, the signal conditioning unit in this invention is particularly important for the feedback signal issued by the error correction circuit.

[0073] Specifically, the signal conditioning unit in this invention has four output modes, and the output mode of the signal conditioning unit is adjusted according to the received control signal and monitoring signal. The feedback signal is different in different output modes.

[0074] The signal conditioning unit in this invention has multiple output modes to adapt to the different feedback signals output to normally open relay K2 and normally closed relay K3 when normally open relay K1 is in different abnormal states. With this setting, the control signals required by normally open relay K2 and normally closed relay K3 only need to be mapped to different output modes to meet the control logic of the error correction circuit, thereby solving the problem caused by the abnormality of normally open relay K1.

[0075] Please see Figure 1 The signal conditioning unit has a first input terminal for receiving monitoring signals and a second input terminal for receiving control signals;

[0076] When both the first input terminal and the second input terminal are input with a low-level signal, the signal conditioning unit is in the first output mode;

[0077] When a low-level signal is input to the first input terminal and a high-level signal is input to the second input terminal, the signal conditioning unit is in the second output mode;

[0078] When a high-level signal is input to the first input terminal and a low-level signal is input to the second input terminal, the signal conditioning unit is in the third output mode.

[0079] When both the first and second input terminals are input with high-level signals, the signal conditioning unit is in the fourth output mode.

[0080] The signal conditioning unit has a first output terminal connected to the control terminal of normally closed relay K3, a fourth output terminal connected to the control terminal of normally open relay K2, and a third and fourth output terminals that are unused.

[0081] When the signal conditioning unit is in the first output mode, the first output terminal outputs a high-level signal, and the second, third, and fourth output terminals all output low-level signals.

[0082] When the signal conditioning unit is in the second output mode, the second output terminal outputs a high-level signal, and the first output terminal, the third output terminal, and the fourth output terminal all output low-level signals.

[0083] When the signal conditioning unit is in the third output mode, the third output terminal outputs a high-level signal, and the first output terminal, the second output terminal, and the fourth output terminal all output low-level signals.

[0084] When the signal conditioning unit is in the fourth output mode, the fourth output terminal outputs a high-level signal, while the first, second, and third output terminals all output low-level signals.

[0085] Please see Figure 1 In this utility model, the first input terminal of the signal conditioning unit is Vin1, the second input terminal is Vin2, the first output terminal is Vout1, the second output terminal is Vout2, the third output terminal is Vout3, and the fourth output terminal is Vout4. The first output terminal is connected to the control terminal of the normally closed relay K3, and the fourth output terminal is connected to the control terminal of the normally open relay K2.

[0086] Please see Figure 3 It is the truth table corresponding to the above four output modes. In the first output mode, Vin1, Vin2, Vout2, Vout3, and Vout4 are 0, which is low level, and Vout1 is 1, which is high level.

[0087] In the second output mode, Vin1, Vout1, Vout3, and Vout4 are 0, which is low level, while Vin2 and Vout1 are 1, which is high level.

[0088] In the third output mode, Vin2, Vout1, Vout2, and Vout4 are 0, which is low level, while Vin1 and Vout3 are 1, which is high level.

[0089] In the fourth output mode, Vout1, Vout3, and Vout4 are 0, which is low level, and Vin1, Vin2, and Vout4 are 1, which is high level.

[0090] As described in the control logic above, to solve the problem of normally open relay K1 failing to close, it is necessary to energize the control terminal of normally open relay K2 when K1 fails to close. Since the control terminal of normally open relay K2 is connected to the fourth output terminal of the signal conditioning unit, in this case, the fourth output terminal of the signal conditioning unit needs to output a high-level signal. (This is in conjunction with the attached...) Figure 3 It can be seen that only the fourth output mode can match this situation. Therefore, when the normally open relay K1 fails to close, the signal conditioning unit needs to be in the fourth output mode.

[0091] Similarly, when normally open relay K1 fails to disconnect, the control terminal of normally closed relay K3 needs to be energized. Simultaneously, to completely disconnect the controlled component, the controlled terminal of normally open relay K2 also needs to be in an open state (closing the controlled terminal of normally open relay K2 will also energize the controlled component). That is, in this situation, the first output terminal of the signal conditioning unit needs to output a high-level new signal, and the fourth output terminal needs to output a low-level signal, in conjunction with the attached... Figure 3 It can be seen that only the first output mode can match this situation. Therefore, when the normally open relay K1 fails to disconnect, the signal conditioning unit needs to be in the first output mode.

[0092] In other words, by setting the four output modes of the above-mentioned signal conditioning unit, the present invention can meet the control of the error correction circuit, so that when the normally open relay K1 fails to close, the error correction circuit can normally supply power to the device under control, and when the normally open relay K1 fails to open, it can disconnect the power supply to the device under control, thereby avoiding the problems existing in the prior art.

[0093] Combined with the appendix of this utility model Figure 3It is known that in order for the signal conditioning unit to be in the first output mode, both the first and second input terminals of the signal conditioning unit need to receive low-level signals. Since the second input terminal of the signal conditioning unit is connected to the main control unit, and the control signal received by the second input terminal is exactly the same as the control signal received by the control terminal of the normally open relay K1, and precisely when the normally open relay K1 fails to disconnect, the main control unit will provide a low-level signal to the normally open relay K1 to disconnect the controlled terminal of the normally open relay K1, which also precisely matches the signal that the second input terminal needs to receive in the first output mode.

[0094] Similarly, when the normally open relay K1 fails to close, the main control unit will provide a high-level signal to the normally open relay K1 to close the controlled terminal of the normally open relay K1, which is exactly the signal that the second input terminal needs to receive in the fourth output mode.

[0095] In other words, this utility model adopts the above connection method for the signal conditioning unit, so that the main control unit can provide the same control signal for the control circuit and the signal conditioning unit. When adjusting the output mode of the signal conditioning unit, the influence of the control signal output by the main control unit can be avoided, and only the monitoring signal provided by the monitoring circuit needs to be considered, which simplifies the control logic of the signal conditioning unit.

[0096] Please see Figure 3 In order for the signal conditioning unit to be in the first output mode, the first input terminal of the signal conditioning unit also needs to be low level. That is, when the normally open relay K1 fails to disconnect, the monitoring circuit needs to send a low level signal to the signal conditioning unit.

[0097] Similarly, in order for the signal conditioning unit to be in the fourth output mode, the first input terminal of the signal conditioning unit needs to be high level. That is, when the normally open relay K1 fails to close, the monitoring circuit needs to send a high level signal to the signal conditioning unit.

[0098] To implement the above control logic, please refer to [link / reference]. Figure 1 The monitoring circuit in this utility model includes: resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, diode D1, diode D2, and optocoupler U1;

[0099] The positive terminal of diode D1 is connected to the first input terminal of the device to be controlled, the negative terminal of diode D1 is connected to the first terminal of optocoupler U1, one end of resistor R1 is connected to the second input terminal of the device to be controlled, the other end of resistor R1 is connected to the second terminal of the device to be controlled, the negative terminal of diode D2 is connected between the negative terminal of diode D1 and the first terminal of optocoupler U1, and the positive terminal of diode D2 is connected between resistor R1 and the second terminal of optocoupler U1.

[0100] One end of resistor R2 is connected to the fourth terminal of optocoupler U1, and the other end of resistor R2 is connected to the first input terminal of the signal conditioning unit. One end of resistor R4 is connected to the third terminal of optocoupler U1, and the other end of resistor R4 is connected between resistor R2 and the first input terminal of the signal conditioning unit. One end of resistor R3 is connected between resistor R2 and the first input terminal of the signal conditioning unit, and the other end of resistor R3 is grounded. One end of capacitor C1 is connected between resistor R2 and the first input terminal of the signal conditioning unit, and the other end of capacitor C1 is grounded. An input power supply is also connected between resistor R4 and the third terminal of optocoupler U1.

[0101] Here, resistors R2 and R4 are actually in parallel. When optocoupler U1 is turned on, the input power supply Vcc reaches the first input terminal after being divided by resistors R2 and R4. The level of the output to the first output terminal mainly depends on the relationship between the values ​​of resistors R2 and R4. Therefore, in this invention, the values ​​of circuit R2 and resistor R4 need to be set to ensure that when resistors R2 and R4 reach the first input terminal, they meet the low voltage recognition range of the signal conditioning unit.

[0102] By setting the resistance values ​​of resistors R2 and R4 as described above, this invention can achieve the following: when the signal conditioning unit needs to be in the first output mode, the monitoring circuit provides a low level to the first input terminal of the signal conditioning unit; when the signal conditioning unit needs to be in the fourth output mode, the monitoring circuit provides a high level to the first input terminal of the signal conditioning unit. Under this setting, the output mode required by the error correction circuit can be met, thereby realizing the control of the error correction circuit when the normally open relay K1 is abnormal.

[0103] Specifically, the signal conditioning unit in this invention uses a binary decoder, which has fewer input terminals and fewer output modes, but can still meet the requirements of the error correction circuit in this invention. Compared with other types of decoders, it has lower cost, simpler control logic, and can still meet the requirements of this invention.

[0104] Please see Figure 1 The specific operating process of this utility model is as follows (taking an electric heater as an example of the component to be controlled):

[0105] 1. When the control circuit is normal (i.e., normally open relay K1 is normal) and the electric heating device needs to be turned on, the MCU outputs a high-level signal, and the second input terminal Vin2 is also at a high level. At this time, the controlled terminal of normally open relay K1 is turned on, and the live wire L reaches the electric heater through the controlled terminal of normally open relay K3, and the electric heating starts to run. At this time, the live wire L reaches the first terminal of optocoupler U1 through diode D1 and forms a voltage difference with the second terminal, so the third terminal to the fourth terminal is turned on. The input power supply VCC flows to the resistor R2 and reaches the first input terminal Vin1 at a low level after voltage division. At this time, the second output terminal Vout2 outputs a high level, and the other pins output a low level. The error correction circuit does not perform any action.

[0106] 2. When the control circuit is normal and the heating device needs to be turned off, the MCU outputs a low-level signal, and the second input terminal Vin2 is also at a low level. At this time, the controlled terminal of the normally open relay K1 and the optocoupler U1 are not conducting. When the input power supply VCC reaches the first input terminal Vin1, it is at a high level. At this time, the third output terminal Vout3 outputs a high level, and the other pins output a low level. The error correction circuit does not perform any action.

[0107] 3. When the control circuit malfunctions (when the normally open relay K1 cannot close), but the electric heater needs to be turned on, the MCU outputs a high-level signal, and the second input terminal Vin2 is also at a high level. However, the controlled terminal of the normally open relay K1 is malfunctioning and cannot conduct, and the optocoupler U1 is also not conducting. When the input power supply VCC reaches the first input terminal Vin1, it is at a high level. At this time, the fourth output terminal Vout4 outputs a high level, which reaches the normally open relay K2 and turns on its controlled terminal. The live wire L can reach the electric heater through the controlled terminal of the normally open relay K2, allowing the electric heater to be turned on normally.

[0108] 4. When the control circuit malfunctions (when the normally open relay K1 fails to close) but it is necessary to turn off the heating device, there is no impact;

[0109] 5. When the control circuit malfunctions (when the normally open relay K1 fails to disconnect) but the electric heating device needs to be turned on, there is no impact;

[0110] 6. When the control circuit malfunctions (when the normally open relay K1 cannot be disconnected) but the electric heater needs to be turned off, the MCU outputs a low-level signal, and the second input terminal Vin2 is also at a low level. However, the normally open relay K1 is malfunctioning and the controlled terminal cannot be disconnected. At this time, the live wire L reaches the electric heater through the controlled terminal of the normally open relay K3, and the electric heater starts to run. At this time, the live wire L reaches the first terminal of the optocoupler U1 through the diode D1, forming a voltage difference with the second terminal. Then the third terminal to the fourth terminal is connected. The input power supply VCC flows to the resistor R2 and reaches the first input terminal Vin1 at a low level after voltage division. At this time, the first output terminal Vout1 outputs a high level, which reaches the normally closed relay K3 to disconnect its controlled terminal, allowing the electric heater to be turned off normally.

[0111] In summary, this invention can monitor the control circuit for abnormalities in real time, and when an abnormality occurs, it ensures the normal operation of the controlled components through a correction circuit. When applied to the control of electric heaters, the correction circuit can prevent problems such as fires and poor heating effects.

[0112] Furthermore, this utility model also proposes an electrical appliance having the aforementioned abnormal self-correction circuit.

[0113] The aforementioned electrical appliances can be any one of air conditioners, water heaters, or washing machines.

[0114] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An anomaly self-correcting circuit, comprising a component to be controlled, characterized in that, Also includes: A control circuit, which is connected to the device to be controlled, is used to control the working state of the device to be controlled; A monitoring circuit, which is connected to the control circuit, is used to monitor whether the control circuit is operating abnormally; An error correction circuit, connected to the control circuit, is used to control the working state of the device to be controlled when the control circuit malfunctions.

2. The anomaly self-correction circuit according to claim 1, characterized in that, The anomaly self-correction circuit also includes: a main control unit and a signal conditioning unit; The main control unit is connected to the control circuit and the signal conditioning unit respectively, and is used to provide the same control signal to the control circuit and the signal conditioning unit; The signal conditioning unit has at least two input terminals connected to the main control unit and the monitoring circuit, and two output terminals connected to the error correction circuit. The signal conditioning unit can output different feedback signals according to the control signal issued by the main control unit and the monitoring signal issued by the monitoring circuit. The feedback signals are used to control the working state of the error correction circuit.

3. The anomaly self-correction circuit according to claim 2, characterized in that, The control circuit includes: a normally open relay K1; The control terminal of the normally open relay K1 is connected to the main control unit. One end of the controlled terminal of the normally open relay K1 is connected to the first terminal of the power supply. The other end of the controlled terminal of the normally open relay K1 is connected to the first input terminal of the device to be controlled. The second input terminal of the device to be controlled is connected to the second terminal of the power supply.

4. The anomaly self-correction circuit according to claim 3, characterized in that, The error correction circuit includes: normally open relay K2 and normally closed relay K3; The control terminal of the normally closed relay K3 is connected to the first output terminal of the signal conditioning unit, and the controlled terminal of the normally closed relay K3 is connected in series between the controlled terminal of the normally open relay K1 and the first input terminal of the device to be controlled. The control terminal of the normally open relay K2 is connected to the fourth output terminal of the signal conditioning unit. One end of the controlled terminal of the normally open relay K2 is connected between the controlled terminal of the normally open relay K1 and the first terminal of the power supply. The other end of the controlled terminal of the normally open relay K2 is connected between the controlled terminal of the normally closed relay K3 and the second input terminal of the device to be controlled.

5. The anomaly self-correction circuit according to claim 2, characterized in that, The monitoring circuit includes: resistors R1, R2, R3, and R4; capacitor C1; diode D1; diode D2; and optocoupler U1. The positive terminal of diode D1 is connected to the first input terminal of the device to be controlled, the negative terminal of diode D1 is connected to the first terminal of optocoupler U1, one end of resistor R1 is connected to the second input terminal of the device to be controlled, the other end of resistor R1 is connected to the second terminal of the device to be controlled, the negative terminal of diode D2 is connected between the negative terminal of diode D1 and the first terminal of optocoupler U1, and the positive terminal of diode D2 is connected between resistor R1 and the second terminal of optocoupler U1. One end of resistor R2 is connected to the fourth terminal of optocoupler U1, and the other end of resistor R2 is connected to the first input terminal of the signal conditioning unit. One end of resistor R4 is connected to the third terminal of optocoupler U1, and the other end of resistor R4 is connected between resistor R2 and the first input terminal of the signal conditioning unit. One end of resistor R3 is connected between resistor R2 and the first input terminal of the signal conditioning unit, and the other end of resistor R3 is grounded. One end of capacitor C1 is connected between resistor R2 and the first input terminal of the signal conditioning unit, and the other end of capacitor C1 is grounded. An input power supply is also connected between resistor R4 and the third terminal of optocoupler U1.

6. The anomaly self-correction circuit according to claim 2, characterized in that, The signal conditioning unit has four output modes, and the output mode of the signal conditioning unit is adjusted according to the received control signal and the monitoring signal. The feedback signal is different in different output modes.

7. The anomaly self-correction circuit according to claim 6, characterized in that, The signal conditioning unit has a first input terminal for receiving the monitoring signal and a second input terminal for receiving the control signal; When both the first input terminal and the second input terminal are input with low-level signals, the signal conditioning unit is in the first output mode; When a low-level signal is input to the first input terminal and a high-level signal is input to the second input terminal, the signal conditioning unit is in the second output mode; When a high-level signal is input to the first input terminal and a low-level signal is input to the second input terminal, the signal conditioning unit is in the third output mode; When both the first input terminal and the second input terminal are input with a high-level signal, the signal conditioning unit is in the fourth output mode.

8. The anomaly self-correction circuit according to claim 7, characterized in that, The signal conditioning unit has a first output terminal connected to the control terminal of normally closed relay K3, a fourth output terminal connected to the control terminal of normally open relay K2, and a third and second output terminal that are unused. When the signal conditioning unit is in the first output mode, the first output terminal outputs a high-level signal, and the second output terminal, the third output terminal, and the fourth output terminal all output low-level signals. When the signal conditioning unit is in the second output mode, the second output terminal outputs a high-level signal, and the first output terminal, the third output terminal, and the fourth output terminal all output low-level signals. When the signal conditioning unit is in the third output mode, the third output terminal outputs a high-level signal, and the first output terminal, the second output terminal, and the fourth output terminal all output low-level signals. When the signal conditioning unit is in the fourth output mode, the fourth output terminal outputs a high-level signal, and the first output terminal, the second output terminal, and the third output terminal all output low-level signals.

9. The anomaly self-correction circuit according to claim 2, characterized in that, The signal conditioning unit is a binary decoder, and the component to be controlled is an electric heater.

10. An electrical appliance, characterized in that, The electrical appliance has an error self-correction circuit as described in any one of claims 1 to 9.

11. The electrical appliance according to claim 10, characterized in that, The electrical appliance can be any one of an air conditioner, a water heater, or a washing machine.

Images