Abnormality detection circuit of a line control circuit and a household appliance
Patent Information
- Application Number
- CN202522516042.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-26
AI Technical Summary
Current household appliances lack fault detection circuits for wired control circuits, which means that when the wired control circuit is damaged, the entire product or main control board needs to be replaced, making the process complicated.
Design an abnormality detection circuit for a wired control circuit, including a first transistor, a second transistor, a third transistor, a controller, a switching circuit, and a diode. The circuit determines the normal and abnormal states of the wired control circuit by detecting the level signal and can identify the cause of the abnormality, such as a short circuit or a diode short circuit.
It enables abnormal detection and cause identification of the wired control circuit, reducing the need to replace the entire unit and improving the efficiency of abnormal handling.
Smart Images
Figure CN224934116U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of home appliance electronic control technology, specifically to an abnormality detection circuit for a wired control circuit and a home appliance. Background Technology
[0002] In related technologies, there is no circuit in household appliances to detect whether the wired control circuit is working properly. When part of the wired control circuit is damaged, the solution is usually to replace the entire product or the main control board, which is a rather complicated method. Utility Model Content
[0003] The present invention aims to solve the technical problems existing in the prior art or related technologies.
[0004] Therefore, the first aspect of this utility model proposes an abnormality detection circuit for a wired control circuit.
[0005] The second aspect of this utility model proposes a household appliance.
[0006] In view of the above, according to the first aspect of this utility model, an abnormality detection circuit for a wired control circuit is proposed, wherein the abnormality detection circuit for the wired control circuit includes: a first transistor, the base of which is connected to a power supply, and the collector of which is connected to an external circuit; a second transistor, the base of which is connected to the collector of which is connected to the first transistor, and the emitter of which is grounded; a third transistor, the base of which is connected to the collector of which is connected to the second transistor, and the emitter of which is grounded; a first controller, including: a first pin and a second pin, the first pin being connected to the collector of which is connected to the third transistor, and the second pin outputting a high-level signal when a low-level signal is detected by the first pin; a switching circuit, the first terminal of which is connected to the second pin, and the switching circuit being in a cut-off state when the second pin outputs a high-level signal, and the second terminal of which is connected to an external circuit; and a diode, the anode of which is connected to the third terminal of which is connected to the switching circuit, and the cathode of which is connected to both the collector of which is connected to the first transistor and the external circuit.
[0007] The fault detection circuit of the wired control circuit provided by this utility model mainly includes: a first transistor, a second transistor, a third transistor, a first controller, a switching circuit, and a diode. The base of the first transistor is connected to a power supply, and the collector of the first transistor is connected to an external circuit. The power supply voltage can be 12V, and the external circuit can be the wired control circuit. The base of the second transistor is connected to the collector of the first transistor, and the emitter of the second transistor is grounded. The collector of the second transistor is connected to the base of the third transistor, and the emitter of the third transistor is grounded. The collector of the third transistor is connected to the first pin of the first controller, and the collectors of both the second and third transistors are also connected to the power output pin of the first controller. The voltage output by the power output pin of the first controller is 3.3V. The first controller also includes a second pin. The first terminal of the switching circuit is connected to the second pin, the second terminal is connected to the external circuit, and the third terminal is connected to the anode of the diode. The cathode of the diode is connected to the collector of the first transistor and the external circuit. The diode can be a TVS (Transient Voltage Suppressor). The first controller can control the switching circuit to turn on and off through the second pin. When the first pin of the first controller detects a high-level signal, it indicates that the external circuit is normal. When the first pin of the first controller detects a low-level signal, it indicates that the external circuit is abnormal. The second pin of the first controller then outputs a high-level signal to put the switching circuit in the off state. If the first pin then detects a low-level signal again, it indicates that the abnormality is caused by a short circuit in the external circuit. If the first pin still detects a high-level signal, it indicates that the abnormality is caused by a short circuit in the diode. This invention realizes the abnormality detection of the wired control circuit and can also determine the cause of the abnormality.
[0008] In some technical solutions, the switching circuit may optionally include: a first switching transistor, the gate of which is connected to a second pin, the source of which is connected to the anode of a diode, and the drain of which is connected to an external circuit.
[0009] In this technical solution, the switching circuit can be a first switching transistor. The gate of the first switching transistor is connected to a second pin, the source of the first switching transistor is connected to the anode of a diode, and the drain of the first switching transistor is connected to an external circuit. Simultaneously, the drain of the first switching transistor is also grounded. When the second pin outputs a low-level signal, the first switching transistor is in a conducting state; when the second pin outputs a high-level signal, the first switching transistor is in a cutoff state. Therefore, the cause of the abnormality can be determined based on the level signal detected by the first pin at this time.
[0010] In some technical solutions, the switching circuit may optionally include: a fourth transistor, the base of which is connected to a second pin, and the emitter of which is connected to an external circuit; a relay, the first terminal of which is connected to the external circuit, and the second terminal of which is connected to the anode of a diode; and a second controller, which is connected to the collector of the fourth transistor and is communicatively connected to the relay. When the second controller detects that the fourth transistor is in a conducting state, the second controller controls the relay to be in a cut-off state.
[0011] In this technical solution, the switching circuit also consists of a fourth transistor, a relay, and a second controller. The base of the fourth transistor is connected to the second pin, the emitter is connected to an external circuit, and the collector is connected to the second controller. The second controller is also communicatively connected to the relay and connected to a power supply. The first terminal of the relay is connected to the external circuit, and the second terminal is connected to the anode of the diode. When the second pin outputs a high-level signal, the fourth transistor is in a conducting state. When the second controller detects that the fourth transistor is in a conducting state, it controls the relay to be in a cut-off state. Therefore, the cause of the abnormality can be determined based on the level signal detected by the first pin at this time.
[0012] In some technical solutions, the switching circuit may optionally include: a fifth transistor, the base of which is connected to the second pin, the emitter of which is connected to the power supply, and the collector of which is connected to the anode of the diode; and a fuse, the first end of which is connected to the collector of the fifth transistor, the second end of which is grounded, and the fuse being in the open state when the fifth transistor is in the conducting state.
[0013] In this technical solution, the switching circuit can also consist of a fifth transistor and a fuse. The base of the fifth transistor is connected to the second pin, the emitter is connected to the power supply, and the collector is connected to the anode of the diode. When the second pin outputs a high-level signal, the fifth transistor is in the conducting state. The first end of the fuse is connected to the collector of the fifth transistor, and the second end is connected to the external circuit and also grounded. When the fifth transistor is in the conducting state, the electrical energy will melt the fuse, causing it to be in the open state. The cause of the abnormality can then be determined based on the level signal detected at the first pin at this time.
[0014] In some technical solutions, the fault detection circuit of the wired control circuit may optionally include: a first resistor, the first end of which is connected to an external circuit, the collector of a first transistor, and the cathode of a diode, respectively, and the second end of which is connected to the base of a second transistor; and a second resistor, the first end of which is connected to the second end of the first resistor and the base of the second transistor, respectively, and the second end of which is grounded.
[0015] In this technical solution, the fault detection circuit of the wired control circuit further includes a first resistor and a second resistor. The first terminal of the first resistor is connected to an external circuit, the collector of the first transistor, and the cathode of the diode. The second terminal of the first resistor is connected to the base of the second transistor and the first terminal of the second resistor. The first terminal of the second resistor is also connected to the base of the second transistor, and the second terminal of the second resistor is grounded. By setting the first and second resistors, the first and second transistors are protected.
[0016] In some technical solutions, the fault detection circuit of the wired control circuit may optionally include: a third resistor, the first end of which is connected to the power output pin of the first controller, and the second end of which is connected to the collector of the second transistor and the base of the third transistor respectively.
[0017] In this technical solution, the fault detection circuit of the wired control circuit also includes a third resistor. The first end of the third resistor is connected to the power output pin of the first controller, and the second end of the third resistor is connected to both the collector and base of the second transistor. By placing the third resistor between the power output pin of the first controller and the second transistor, the second transistor is protected.
[0018] In some technical solutions, the fault detection circuit of the wired control circuit may optionally include: a fourth resistor, the first end of which is connected to the power output pin of the first controller, and the second end of which is connected to the collector of the third transistor and the first pin respectively.
[0019] In this technical solution, the fault detection circuit of the wired control circuit further includes a fourth resistor. The first end of the fourth resistor is connected to the power output pin of the first controller, and the second end of the fourth resistor is connected to both the collector of the third transistor and the first pin of the first controller. By placing the fourth resistor between the first pin and the third transistor, the third transistor is protected.
[0020] In some technical solutions, the fault detection circuit of the wired control circuit may optionally include: a sixth transistor, the emitter of which is connected to the power supply, the base of which is connected to the emitter of the first transistor, and the collector of which is connected to the base of the first transistor; a fifth resistor, the first end of which is connected to the collector of the sixth transistor and is grounded; a sixth resistor, the first end of which is connected to the power supply and the emitter of the sixth transistor; and a seventh resistor, the first end of which is connected to the second end of the sixth resistor, the base of the sixth transistor, and the emitter of the first transistor, and the second end of which is connected to the collector of the sixth transistor and the base of the first transistor.
[0021] In this technical solution, the fault detection circuit of the wired control circuit further includes: a sixth transistor, a fifth resistor, a sixth resistor, and a seventh resistor. The emitter of the sixth transistor is connected to the power supply. The base of the sixth transistor is connected to the emitter of the first transistor, the second terminal of the sixth resistor, and the first terminal of the seventh resistor. The collector of the sixth transistor is connected to the base of the first transistor and the first terminal of the fifth resistor. The second terminal of the fifth resistor is grounded. The first terminal of the sixth resistor is connected to the power supply and the emitter of the sixth transistor. The second terminal of the sixth resistor is connected to the base of the sixth transistor, the first terminal of the seventh resistor, and the emitter of the first transistor. The first terminal of the seventh resistor is connected to the second terminal of the sixth resistor, the base of the sixth transistor, and the emitter of the first transistor. The second terminal of the seventh resistor is connected to the base of the first transistor and the collector of the sixth transistor. By setting up the sixth transistor, the fifth resistor, the sixth resistor, and the seventh resistor, the external circuit and the switching current are protected.
[0022] In some technical solutions, the abnormal detection circuit of the wired control circuit may optionally include: a seventh transistor, the collector of which is connected to the second end of the fifth resistor, and the emitter of which is grounded; an eighth resistor, the first end of which is connected to the power output pin of the first controller, and the second end of which is connected to the third pin of the first controller and the base of the seventh transistor.
[0023] In this technical solution, the fault detection circuit of the wired control circuit further includes a seventh transistor and an eighth resistor. The collector of the seventh transistor is connected to the second terminal of the fifth resistor, the emitter of the seventh transistor is grounded, and the base of the seventh transistor is connected to both the second terminal of the eighth resistor and the third pin of the first controller. The first terminal of the eighth resistor is connected to the power output pin of the first controller, and the second terminal of the eighth resistor is connected to both the third pin of the first controller and the base of the seventh transistor. By using the seventh transistor and the eighth resistor, a protective function is achieved.
[0024] According to a second aspect of the present invention, a household appliance is provided, including an abnormality detection circuit for the wired control circuit as described in any of the above claims.
[0025] The household appliance provided by this utility model includes an abnormality detection circuit for the wired control circuit as described above, which can achieve the technical effects of any of the above technical solutions, and will not be described in detail here.
[0026] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description
[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This diagram illustrates one of the structural schematics of an abnormality detection circuit for a wired control circuit according to an embodiment of the present invention. Figure 2 A flowchart illustrating the execution process of the first controller according to an embodiment of the present invention is shown. Figure 3 The second schematic diagram shows the structure of the fault detection circuit of the wired control circuit according to an embodiment of the present invention; Figure 4 The third schematic diagram shows the structure of the fault detection circuit of the wired control circuit according to an embodiment of the present invention; Figure 5 A structural block diagram of a household appliance according to an embodiment of the present invention is shown; in, Figure 1 , Figures 3 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows: 10. Household appliances, 100. Abnormal detection circuit for wired control circuit, Q1 first transistor, Q2 second transistor, Q3 third transistor, 102 first controller, RX first pin, K1 second pin, 104. Switching circuit, D1 diode, Q4 first switching transistor, Q5 fourth transistor, 106 relay, 108 second controller, Q6 fifth transistor, 110. Fuse, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, Q7 sixth transistor, R5 fifth resistor, R6 sixth resistor, R7 seventh resistor, Q8 seventh transistor, R8 eighth resistor, TX third pin, 20. External circuit. Detailed Implementation
[0028] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.
[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.
[0030] like Figure 1 , Figure 3 as well as Figure 4 As shown, this utility model proposes an abnormality detection circuit 100 for a wired control circuit, wherein the abnormality detection circuit 100 for the wired control circuit includes: a first transistor Q1, a second transistor Q2, a third transistor Q3, a first controller 102, a switching circuit 104, and a diode D1. In this circuit, the base of the first transistor Q1 is connected to the power supply, and the collector of the first transistor Q1 is connected to the external circuit 20; the base of the second transistor Q2 is connected to the collector of the first transistor Q1, and the emitter of the second transistor Q2 is grounded; the base of the third transistor Q3 is connected to the collector of the second transistor Q2, and the emitter of the third transistor Q3 is grounded; the first controller 102 includes a first pin RX and a second pin K1. The first pin RX is connected to the collector of the third transistor Q3, and when the first pin RX detects a low-level signal, the second pin K1 outputs a high-level signal; the first terminal of the switching circuit 104 is connected to the second pin K1. When the second pin K1 outputs a high-level signal, the switching circuit 104 is in the off state, and the second terminal of the switching circuit 104 is connected to the external circuit 20; the anode of the diode D1 is connected to the third terminal of the switching circuit 104, and the cathode of the diode D1 is connected to the collector of the first transistor Q1 and the external circuit 20, respectively.
[0031] The fault detection circuit 100 of the wired control circuit provided by this utility model mainly includes: a first transistor Q1, a second transistor Q2, a third transistor Q3, a first controller 102, a switching circuit 104, and a diode D1. The base of the first transistor Q1 is connected to a power supply, and the collector of the first transistor Q1 is connected to an external circuit 20. The power supply voltage can be 12V, and the external circuit 20 can be a wired control circuit. The type of the first transistor Q1 can be B772 / SOT-89. The base of the second transistor Q2 is connected to the collector of the first transistor Q1, the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is connected to the base of the third transistor Q3. The type of the second transistor Q2 can be S8050. The emitter of the third transistor Q3 is grounded, and its collector is connected to the first pin RX of the first controller 102. Simultaneously, the collector of the second transistor Q2 is also connected to the power output pin of the first controller 102, and the collector of the third transistor Q3 is also connected to the power output pin of the first controller 102. The third transistor Q3 is an S8050, and the voltage output by the power output pin of the first controller 102 is 3.3V. The first controller 102 also includes a second pin K1. The first terminal of the switching circuit 104 is connected to the second pin K1, the second terminal of the switching circuit 104 is connected to the external circuit 20, and the third terminal of the switching circuit 104 is connected to the anode of diode D1. The cathode of diode D1 is connected to both the collector of the first transistor Q1 and the external circuit 20. Diode D1 can be a TVS diode (Transient Voltage Suppressor), and the TVS diode type is 23V / SMB. The first controller 102 can control the switching circuit 104 to turn on and off via the second pin K1. When the first pin RX of the first controller 102 detects a high-level signal, it indicates that the external circuit 20 is normal. When the first pin RX of the first controller 102 detects a low-level signal, it indicates that the external circuit 20 is abnormal. Consequently, the second pin K1 of the first controller 102 outputs a high-level signal to put the switching circuit 104 in the off state. If the first pin RX then detects a low-level signal again, it indicates that the abnormality is caused by a short circuit in the external circuit 20. If the first pin RX still detects a high-level signal, it indicates that the abnormality is caused by a short circuit in diode D1. This invention realizes the abnormality detection of the wired control circuit and can also determine the cause of the abnormality.
[0032] For example, when the external circuit 20 is operating normally, diode D1 is in the off state, and the collector of the first transistor Q1 is at a high level. Since the collector of the first transistor Q1 is connected to the base of the second transistor Q2, the second transistor Q2 is in the on state. Since the collector of the second transistor Q2 is connected to the base of the third transistor Q3 and the power output pin of the first controller 102, the third transistor Q3 is in the off state when the second transistor Q2 is in the on state. Since the collector of the third transistor Q3 is connected to the first pin RX and the power output pin of the first controller 102, the first pin RX will detect a high level signal when the third transistor Q3 is in the off state. Therefore, when the first pin RX detects a high level signal, the first controller 102 can determine that the external circuit 20 is in a normal state.
[0033] For example, when an abnormality occurs in the external circuit 20 causing a short circuit, since the collector of the first transistor Q1 is connected to the external circuit 20, the collector of the first transistor Q1 is at a low level. Since the collector of the first transistor Q1 is connected to the base of the second transistor Q2, the second transistor Q2 is in a cutoff state. Since the collector of the second transistor Q2 is connected to both the base of the third transistor Q3 and the power output pin of the first controller 102, the third transistor Q3 is in a conducting state when the second transistor Q2 is in a cutoff state. Since the collector of the third transistor Q3 is connected to both the first pin RX and the power output pin of the first controller 102, the first pin RX will detect a low level signal when the third transistor Q3 is in a conducting state. Therefore, when the first pin RX detects a low level signal, the first controller 102 can determine that the external circuit 20 is in an abnormal state.
[0034] For example, when the first pin RX detects a low-level signal, the second pin K1 of the first controller 102 outputs a high-level signal, thereby causing the switching circuit 104 to be in the off state. When the switching circuit 104 is in the off state, it is understood that if the fault is a short circuit in diode D1, the collector of the first transistor Q1 will return to a high-level signal, causing the first pin RX to detect a high-level signal again. If the fault is a short circuit in external circuit 20, the collector of the first transistor Q1 will still be a low-level signal, causing the first pin RX to still detect a low-level signal. Therefore, after the second pin K1 of the first controller 102 transmits a high-level signal, if the first pin RX still detects a low-level signal, the first controller 102 determines that the abnormality is a short circuit in external circuit 20; if the first pin RX detects a high-level signal, the first controller 102 determines that the abnormality is a short circuit in diode D1.
[0035] In some embodiments, optionally, such as Figure 1 As shown, the switching circuit 104 includes: a first switching transistor Q4, the gate of the first switching transistor Q4 is connected to the second pin K1, the source of the first switching transistor Q4 is connected to the anode of the diode D1, and the drain of the first switching transistor Q4 is connected to the external circuit 20.
[0036] In this embodiment, the switching circuit 104 can be a first switching transistor Q4. The gate of the first switching transistor Q4 is connected to the second pin K1, the source of the first switching transistor Q4 is connected to the anode of the diode D1, and the drain of the first switching transistor Q4 is connected to the external circuit 20. The drain of the first switching transistor Q4 is also grounded. The first switching transistor Q4 is of type 11N65 and can be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor). When the second pin K1 outputs a low-level signal, the first switching transistor Q4 is in the on state; when the second pin K1 outputs a high-level signal, the first switching transistor Q4 is in the off state. Therefore, the cause of the abnormality can be determined based on the level signal detected by the first pin RX at this time.
[0037] Figure 2 A flowchart illustrating the execution process of a first controller according to an embodiment of the present invention is shown; wherein the execution process of the first controller 102 includes: Step 202: Begin; Step 204: Determine whether the first pin level is connected to a low level. If the result is yes, proceed to step 206; if the result is no, proceed to step 216. Step 206: The second pin outputs a high level; Step 208: MOSFET is turned off; Step 210: Determine whether the level of the first pin is low. If the result is yes, proceed to step 212. If the result is no, proceed to step 214. Step 212: Display the first error code; Step 214: Display the second error code; Step 216: End.
[0038] In this embodiment, the execution process of the first controller 102 is as follows: when the first pin RX of the first controller 102 continuously detects a low-level signal, the second pin K1 of the first controller 102 outputs a high-level signal, thereby turning off the MOS transistor, i.e., the switching circuit 104. Then, the first pin RX detects the level again. If the first pin RX detects a low-level signal, it indicates that the abnormality is caused by a short circuit in the external circuit 20. If the first pin RX detects a high-level signal, it indicates that the abnormality is caused by a short circuit in the TVS transistor, i.e., the diode D1. Exemplarily, the first controller 102 is also connected to a display component. When the first controller 102 determines that the abnormality is caused by a short circuit in the external circuit 20, the display component will display a first error code to remind the user that a short circuit fault has occurred in the external circuit 20. When the first controller 102 determines that the abnormality is caused by a short circuit in the TVS transistor, the display component will display a second error code to remind the user that a short circuit fault has occurred in the TVS transistor. In this invention, when the first pin RX of the first controller 102 is detected to be at a low level, the control switch is short-circuited and cut off. If the first pin RX is still at a low level, the external circuit 20 is short-circuited. If the first pin RX is at a high level, the diode D1 is short-circuited. Finally, a specific code is displayed through the display component to prompt the user and maintenance personnel about the cause of the damage. After the user and maintenance personnel know the cause of the damage through the code, they can take measures such as providing a remote control to handle the problem, avoiding complicated methods such as disassembly and replacement, saving manpower and improving the efficiency of abnormal handling.
[0039] In some embodiments, optionally, such as Figure 3 As shown, the switching circuit 104 includes: a fourth transistor Q5, a relay 106, and a second controller 108. The base of the fourth transistor Q5 is connected to the second pin K1, and the emitter of the fourth transistor Q5 is connected to the external circuit 20. The first terminal of the relay 106 is connected to the external circuit 20, and the second terminal of the relay 106 is connected to the anode of the diode D1. The second controller 108 is connected to the collector of the fourth transistor Q5 and is communicatively connected to the relay 106. When the second controller 108 detects that the fourth transistor Q5 is in a conducting state, the second controller 108 controls the relay 106 to be in a cut-off state.
[0040] In this embodiment, the switching circuit 104 also comprises a fourth transistor Q5, a relay 106, and a second controller 108. The base of the fourth transistor Q5 is connected to the second pin K1, the emitter of the fourth transistor Q5 is connected to the external circuit 20, and the collector of the fourth transistor Q5 is connected to the second controller 108. The fourth transistor Q5 can be of type B772 / SOT-89. The second controller 108 is also communicatively connected to the relay 106 and connected to a power supply. The first terminal of the relay 106 is connected to the external circuit 20, and the second terminal of the relay 106 is connected to the anode of the diode D1. The rated current of the relay 106 can be 5A. When the second pin K1 outputs a high-level signal, the fourth transistor Q5 is in a conducting state. When the second controller 108 detects that the fourth transistor Q5 is in a conducting state, the second controller 108 controls the relay 106 to be in a cut-off state. The cause of the abnormality can then be determined based on the level signal detected by the first pin RX at this time.
[0041] In some embodiments, optionally, such as Figure 4 As shown, the switching circuit 104 includes a fifth transistor Q6 and a fuse 110. The base of the fifth transistor Q6 is connected to the second pin K1, the emitter of the fifth transistor Q6 is connected to the power supply, and the collector of the fifth transistor Q6 is connected to the anode of the diode D1. The first end of the fuse 110 is connected to the collector of the fifth transistor Q6, and the second end of the fuse 110 is grounded. When the fifth transistor Q6 is in the conducting state, the fuse 110 is in the open state.
[0042] In this embodiment, the switching circuit 104 can also be composed of a fifth transistor Q6 and a fuse 110. The base of the fifth transistor Q6 is connected to the second pin K1, the emitter of the fifth transistor Q6 is connected to the power supply, and the collector of the fifth transistor Q6 is connected to the anode of the diode D1. When the second pin K1 outputs a high-level signal, the fifth transistor Q6 is in the conducting state. The first end of the fuse 110 is connected to the collector of the fifth transistor Q6, and the second end of the fuse 110 is connected to the external circuit 20, while also being grounded. When the fifth transistor Q6 is in the conducting state, electrical energy will melt the fuse 110, causing it to be in the open state. The cause of the abnormality can then be determined based on the level signal detected at the first pin RX.
[0043] In some embodiments, optionally, such as Figure 1 , Figure 3 as well as Figure 4As shown, the fault detection circuit 100 of the wired control circuit further includes: a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the external circuit 20, the collector of the first transistor Q1, and the cathode of the diode D1, respectively, and the second end of the first resistor R1 is connected to the base of the second transistor Q2; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the base of the second transistor Q2, respectively, and the second end of the second resistor R2 is grounded.
[0044] In this embodiment, the fault detection circuit 100 of the wired control circuit further includes a first resistor R1 and a second resistor R2. The first terminal of the first resistor R1 is connected to the external circuit 20, the collector of the first transistor Q1, and the cathode of the diode D1. The second terminal of the first resistor R1 is connected to the base of the second transistor Q2 and the first terminal of the second resistor R2. The first resistor R1 can be of type 0805-10K. The first terminal of the second resistor R2 is also connected to the base of the second transistor Q2, and the second terminal of the second resistor R2 is grounded. The second resistor R2 can be of type 0805-1K. By setting the first resistor R1 and the second resistor R2, the first transistor Q1 and the second transistor Q2 are protected.
[0045] In some embodiments, optionally, such as Figure 1 , Figure 3 as well as Figure 4 As shown, the abnormal detection circuit 100 of the wired control circuit also includes: a third resistor R3, the first end of the third resistor R3 is connected to the power output pin of the first controller 102, and the second end of the third resistor R3 is connected to the collector of the second transistor Q2 and the base of the third transistor Q3 respectively.
[0046] In this embodiment, the fault detection circuit 100 of the wired control circuit further includes a third resistor R3. The first end of the third resistor R3 is connected to the power output pin of the first controller 102, and the second end of the third resistor R3 is connected to the collector of the second transistor Q2 and the base of the third transistor Q3. The third resistor R3 can be of type 0805-1K. By placing the third resistor R3 between the power output pin of the first controller 102 and the second transistor Q2, the second transistor Q2 is protected.
[0047] In some embodiments, optionally, such as Figure 1 , Figure 3 as well as Figure 4 As shown, the abnormal detection circuit 100 of the wired control circuit further includes: a fourth resistor R4, the first end of the fourth resistor R4 is connected to the power output pin of the first controller 102, and the second end of the fourth resistor R4 is connected to the collector of the third transistor Q3 and the first pin RX respectively.
[0048] In this embodiment, the fault detection circuit 100 of the wired control circuit further includes a fourth resistor R4. The first end of the fourth resistor R4 is connected to the power output pin of the first controller 102, and the second end of the fourth resistor R4 is connected to the collector of the third transistor Q3 and the first pin RX of the first controller 102. The fourth resistor R4 can be of type 0603-10K. By placing the fourth resistor R4 between the first pin RX and the third transistor Q3, the third transistor Q3 is protected.
[0049] In some embodiments, optionally, such as Figure 1 , Figure 3 as well as Figure 4 As shown, the fault detection circuit 100 of the wired control circuit further includes: a sixth transistor Q7, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The emitter of the sixth transistor Q7 is connected to the power supply, the base of the sixth transistor Q7 is connected to the emitter of the first transistor Q1, and the collector of the sixth transistor Q7 is connected to the base of the first transistor Q1; the first end of the fifth resistor R5 is connected to the collector of the sixth transistor Q7, and the fifth resistor R5 is grounded; the first end of the sixth resistor R6 is connected to the power supply and the emitter of the sixth transistor Q7; the first end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, the base of the sixth transistor Q7, and the emitter of the first transistor Q1, and the second end of the seventh resistor R7 is connected to the collector of the sixth transistor Q7 and the base of the first transistor Q1.
[0050] In this embodiment, the fault detection circuit 100 of the wired control circuit further includes: a sixth transistor Q7, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The emitter of the sixth transistor Q7 is connected to the power supply. The base of the sixth transistor Q7 is connected to the emitter of the first transistor Q1, the second terminal of the sixth resistor R6, and the first terminal of the seventh resistor R7. The collector of the sixth transistor Q7 is connected to the base of the first transistor Q1 and the first terminal of the fifth resistor R5. The type of the sixth transistor Q7 can be S8550-SOT23. The second terminal of the fifth resistor R5 is grounded, and the type of the fifth resistor R5 can be 0805-10K. The first terminal of the sixth resistor R6 is connected to the power supply and the emitter of the sixth transistor Q7. The second terminal of the sixth resistor R6 is connected to the base of the sixth transistor Q7, the first terminal of the seventh resistor R7, and the emitter of the first transistor Q1. The type of the sixth resistor R6 can be 10R / 1206. The first terminal of the seventh resistor R7 is connected to the second terminal of the sixth resistor R6, the base of the sixth transistor Q7, and the emitter of the first transistor Q1. The second terminal of the seventh resistor R7 is connected to the base of the first transistor Q1 and the collector of the sixth transistor Q7. The seventh resistor R7 can be a 10K / 0805 type. By using the sixth transistor Q7, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7, the external circuit 20 is protected, and the switching current is controlled.
[0051] In some embodiments, optionally, such as Figure 1 , Figure 3 as well as Figure 4 As shown, the fault detection circuit 100 of the wired control circuit also includes: a seventh transistor Q8 and an eighth resistor R8. The collector of the seventh transistor Q8 is connected to the second end of the fifth resistor R5, and the emitter of the seventh transistor Q8 is grounded; the first end of the eighth resistor R8 is connected to the power output pin of the first controller 102, and the second end of the eighth resistor R8 is connected to the third pin TX of the first controller 102 and the base of the seventh transistor Q8, respectively.
[0052] In this embodiment, the fault detection circuit 100 of the wired control circuit further includes a seventh transistor Q8 and an eighth resistor R8. The collector of the seventh transistor Q8 is connected to the second terminal of the fifth resistor R5, the emitter of the seventh transistor Q8 is grounded, and the base of the seventh transistor Q8 is connected to the second terminal of the eighth resistor R8 and the third pin TX of the first controller 102. The seventh transistor Q8 can be an S8050. The first terminal of the eighth resistor R8 is connected to the power output pin of the first controller 102, and the second terminal of the eighth resistor R8 is connected to the third pin TX of the first controller 102 and the base of the seventh transistor Q8. The eighth resistor R8 can be a 0805-10K type. By setting the seventh transistor Q8 and the eighth resistor R8, a protective function is achieved.
[0053] like Figure 5 As shown, this utility model proposes a household appliance 10, including an abnormality detection circuit 100 of the wired control circuit as described in any of the above claims.
[0054] The household appliance 10 provided by this utility model includes an abnormality detection circuit 100 of the wired control circuit as described in any of the above embodiments, which can achieve the technical effects of any of the above embodiments, and will not be described again here.
[0055] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, unless otherwise expressly specified and limited. The terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0057] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An anomaly detection circuit for a wired control circuit, characterized in that, include: The first transistor has its base connected to the power supply and its collector connected to an external circuit. The base of the second transistor is connected to the collector of the first transistor, and the emitter of the second transistor is grounded. The third transistor has its base connected to the collector of the second transistor, and its emitter grounded. A first controller, comprising: a first pin and a second pin, wherein the first pin is connected to the collector of the third transistor, and the second pin outputs a high-level signal when the first pin detects a low-level signal; A switching circuit, wherein the first terminal of the switching circuit is connected to the second pin, and the switching circuit is in the off state when the second pin outputs a high-level signal; the second terminal of the switching circuit is connected to the external circuit. A diode, wherein the anode of the diode is connected to the third terminal of the switching circuit, and the cathode of the diode is connected to the collector of the first transistor and the external circuit respectively.
2. The fault detection circuit of the wired control circuit according to claim 1, characterized in that, The switching circuit includes: The first switching transistor has its gate connected to the second pin, its source connected to the anode of the diode, and its drain connected to the external circuit.
3. The fault detection circuit of the wired control circuit according to claim 1, characterized in that, The switching circuit includes: The fourth transistor has its base connected to the second pin and its emitter connected to the external circuit. A relay, wherein the first terminal of the relay is connected to the external circuit, and the second terminal of the relay is connected to the anode of the diode; The second controller is connected to the collector of the fourth transistor and is communicatively connected to the relay. When the second controller detects that the fourth transistor is in a conducting state, the second controller controls the relay to be in a cut-off state.
4. The fault detection circuit of the wired control circuit according to claim 1, characterized in that, The switching circuit includes: The fifth transistor has its base connected to the second pin, its emitter connected to the power supply, and its collector connected to the anode of the diode. The fuse has its first end connected to the collector of the fifth transistor and its second end grounded. When the fifth transistor is in the on state, the fuse is in the off state.
5. The fault detection circuit for the wired control circuit according to any one of claims 1 to 4, characterized in that, The fault detection circuit of the wired control circuit also includes: A first resistor, the first end of which is connected to the external circuit, the collector of the first transistor, and the cathode of the diode, respectively, and the second end of which is connected to the base of the second transistor. The second resistor has its first end connected to the second end of the first resistor and the base of the second transistor, respectively, and its second end is grounded.
6. The fault detection circuit for the wired control circuit according to any one of claims 1 to 4, characterized in that, The fault detection circuit of the wired control circuit also includes: The third resistor has its first end connected to the power output pin of the first controller, and its second end connected to the collector of the second transistor and the base of the third transistor.
7. The fault detection circuit for the wired control circuit according to any one of claims 1 to 4, characterized in that, The fault detection circuit of the wired control circuit also includes: The fourth resistor has its first end connected to the power output pin of the first controller, and its second end connected to the collector of the third transistor and the first pin, respectively.
8. The fault detection circuit for the wired control circuit according to any one of claims 1 to 4, characterized in that, The fault detection circuit of the wired control circuit also includes: The sixth transistor has its emitter connected to the power supply, its base connected to the emitter of the first transistor, and its collector connected to the base of the first transistor. The fifth resistor has its first terminal connected to the collector of the sixth transistor, and its second terminal is grounded. The sixth resistor has its first end connected to both the power supply and the emitter of the sixth transistor. The seventh resistor has its first end connected to the second end of the sixth resistor, the base of the sixth transistor, and the emitter of the first transistor, respectively, and its second end connected to the collector of the sixth transistor and the base of the first transistor, respectively.
9. The fault detection circuit of the wired control circuit according to claim 8, characterized in that, The fault detection circuit of the wired control circuit also includes: The seventh transistor has its collector connected to the second terminal of the fifth resistor, and its emitter is grounded. The eighth resistor has its first end connected to the power output pin of the first controller, and its second end connected to the third pin of the first controller and the base of the seventh transistor.
10. A household appliance, characterized in that, include: An abnormality detection circuit for a wired control circuit as described in any one of claims 1 to 9.