Self-protection circuit based on overcurrent detection and clothing handling device

Abstract

This invention provides a self-protection circuit and a clothing handling device based on overcurrent detection. The self-protection circuit includes a current detection module and a protection trigger signal output terminal. The current detection module includes a first sampling resistor R1 and a second sampling resistor R2, which are connected in series to the inverter output terminal of the intelligent power module. The protection trigger signal output terminal is located between the first sampling resistor R1 and the second sampling resistor R2 and connected to the overcurrent detection input terminal of the intelligent power module. This invention utilizes the overvoltage self-cutoff protection logic of the intelligent power module. By setting two sampling resistors, overcurrent detection of the motor drive circuit can be achieved, improving the response speed of the trigger protection and ensuring the operational reliability of the motor drive.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, and in particular to a self-protection circuit based on overcurrent detection and a clothing handling device. Background Technology

[0002] In motor drive systems, the intelligent power module, as a core power device, directly determines the system's reliability through its safe operation. When abnormal conditions such as sudden load changes, stalling, or short circuits occur during motor operation, the current in the motor drive circuit will increase sharply. If the drive signal is not cut off in time, the excessive current will cause the intelligent power module to overheat and be damaged.

[0003] In existing technologies, overcurrent protection for intelligent power modules is mostly achieved by setting a shunt resistor R3 and a comparator. First, the current sampling characteristics of the shunt resistor R3 connected in series in the output circuit of the intelligent power module are used to convert the circuit current into a voltage signal. Then, the comparator compares the voltage signal with a preset threshold voltage in real time. When the sampled voltage exceeds the threshold voltage, the comparator outputs a low-level signal to the motor driver chip. The driver chip immediately stops outputting drive signals to the intelligent power module, thereby cutting off the power circuit and achieving protection.

[0004] When implementing overcurrent protection using this method of setting shunt resistor R3 and comparators, corresponding comparators need to be equipped for all three phases (UVW) of the motor. In this case, the constructed protection circuit involves comparators for all three phases, shunt resistor R3, motor driver chip, and intelligent power chip. The signal transmission path is lengthy and the structure is relatively complex. This results in a long response time for triggering protection during overcurrent protection. Under sudden large current surges, the intelligent power module is easily damaged, and the operational reliability of the intelligent power module cannot be guaranteed. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies that use shunt resistor R3 and comparators to implement overcurrent protection for intelligent power modules. These technologies have lengthy signal transmission paths, complex structures, long response times for triggering protection, and are unable to cope with sudden large currents, which can easily damage the intelligent power module. This invention provides a self-protection circuit and clothing handling device based on overcurrent detection. By utilizing the overvoltage self-cutoff protection logic of the intelligent power module, overcurrent detection of the motor drive circuit can be achieved by setting the first sampling resistor R1 and the second sampling resistor R2. This simplifies the protection circuit structure, improves the response speed of triggering protection, and effectively improves the operational reliability of the intelligent power module.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A self-protection circuit based on overcurrent detection is connected to the intelligent power module in the motor drive circuit, including a current detection module and a protection trigger signal output terminal.

[0008] The current detection module includes a first sampling resistor R1 and a second sampling resistor R2, which are connected in series and connected to the inverter output terminal of the intelligent power module.

[0009] The protection trigger signal output terminal is located between the first sampling resistor R1 and the second sampling resistor R2 and connected to the overcurrent detection input terminal of the intelligent power module.

[0010] By setting two sampling resistors to convert the motor current in the motor drive circuit into node voltages, and then cooperating with the overvoltage self-cutoff protection logic of the intelligent power module, overcurrent detection in the motor drive circuit can be achieved. No additional comparator is needed for threshold judgment, eliminating the voltage divider network and logic control structures found in traditional overcurrent protection methods. This effectively reduces the number of components in the protection circuit, simplifies the protection circuit structure, and lowers the corresponding costs. Furthermore, this structure, which directly uses resistors and the intelligent power module's internal trigger protection, effectively shortens the signal path for triggering overcurrent protection, improves the response speed of overcurrent protection, adapts to self-protection scenarios with sudden large current inrushes, and effectively improves the operational reliability of the intelligent power module.

[0011] Furthermore, the self-protection circuit also includes:

[0012] The shunt resistor R3 is connected in parallel across the current detection module and connected to the inverter output terminal of the intelligent power module.

[0013] A shunt resistor R3 is introduced to flexibly adjust the sampling range of the current detection module. By adjusting the resistance ratio of the shunt resistor R3 to the first sampling resistor R1 and the second sampling resistor R2, it can be ensured that the current flowing through the sampling resistor is always within its rated range, which protects the core sampling component and ensures the accuracy of overcurrent signal detection.

[0014] Furthermore, the self-protection circuit also includes:

[0015] The motor current detection resistor is connected in series between the inverter output terminal of the intelligent power module and the current detection module.

[0016] Furthermore, the motor current detection resistor includes:

[0017] The first detection resistor R4 is connected in series between the inverter output terminal U-phase output of the intelligent power module and the current detection module.

[0018] The second detection resistor R5 is connected in series between the inverter output terminal V-phase output of the intelligent power module and the current detection module.

[0019] By setting a motor current detection resistor, the output voltage at the inverter output terminal of the intelligent power module is converted to obtain the motor current in the motor drive circuit, providing a data basis for subsequent overcurrent detection. Furthermore, corresponding detection resistors are set only for the U-phase and V-phase outputs of the intelligent power module's inverter output terminal, simplifying the circuit design while achieving full-phase current monitoring of the motor drive circuit.

[0020] Furthermore, the self-protection circuit also includes:

[0021] An adjustable resistor RP is connected in parallel across the first sampling resistor R1.

[0022] An adjustable resistor RP is introduced to make the overcurrent detection threshold dynamically adjustable, so that the same self-protection circuit can be adapted to motors with different power and load characteristics. It can meet diverse protection needs without replacing the sampling resistor, thus improving the scenario adaptability of the self-protection circuit.

[0023] Furthermore, the overcurrent detection input terminal of the intelligent power module is also equipped with a cutoff voltage threshold that triggers the intelligent power module to self-turn off.

[0024] By using the cutoff voltage threshold at the overcurrent detection input of the intelligent power module, the intelligent power module can be directly triggered to cut off through internal hardware logic, which can effectively improve the response speed for overcurrent protection.

[0025] Furthermore, the self-protection circuit also includes:

[0026] The filtering module is connected between the protection trigger signal output terminal and the overcurrent input terminal of the intelligent power module.

[0027] The high-frequency noise in the protection trigger signal is filtered out by the filtering module to avoid false triggering of the protection and improve the operational reliability of the self-protection circuit.

[0028] Clothing handling device, including:

[0029] Self-protection circuits as described in any of the above items.

[0030] Furthermore, the garment handling device is a washing machine, a dryer, or a washer-dryer combo.

[0031] The beneficial effects of this utility model are:

[0032] (1) By setting two sampling resistors to convert the motor current in the motor drive circuit into node voltage, and then cooperating with the overvoltage self-cutoff protection logic of the intelligent power module, overcurrent detection of the motor drive circuit can be realized without the need for an additional comparator for threshold judgment. This eliminates the need for voltage divider networks and logic control structures in traditional overcurrent protection methods, effectively reducing the number of components in the protection circuit, simplifying the protection circuit structure, and reducing the corresponding costs. Moreover, this structure, which directly uses resistors and the internal trigger protection of the intelligent power module, can also effectively shorten the signal path for triggering overcurrent protection, improve the response speed of overcurrent protection, adapt to self-protection scenarios with sudden large currents, and effectively improve the operational reliability of the intelligent power module.

[0033] (2) A shunt resistor R3 is further added to flexibly adjust the sampling range of the current detection module, ensuring the accuracy of overcurrent signal detection while protecting the core sampling components. A motor current detection resistor is also provided, enabling full-phase current monitoring of the motor drive circuit through the inverter output of the intelligent power module, simplifying the circuit design of the self-protection circuit and reducing costs.

[0034] (3) An adjustable resistor RP is also provided to make the overcurrent detection threshold dynamically adjustable, which can be adapted to motors with different power and load characteristics. It can meet diverse protection needs without replacing the sampling resistor, thus improving the scenario adaptability of the self-protection circuit. The self-protection process can also be associated with the real-time operating status of the motor. During the overcurrent detection process, the resistance value of the adjustable resistor RP can be adjusted accordingly to effectively broaden the adaptability of overcurrent protection during motor operation.

[0035] (4) The self-cutoff of the intelligent power module does not require the intervention of external driver chips or controllers. Its overcurrent detection input terminal is set with a corresponding cutoff voltage threshold. The intelligent power module can be directly triggered to cut off through internal hardware logic, which effectively reduces the risk of protection failure caused by external factors such as communication failure. While improving the response speed of overcurrent protection, it also ensures the accuracy of overcurrent protection. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a self-protection circuit provided in the first embodiment of this utility model;

[0037] Figure 2 This is a circuit diagram of a self-protection circuit provided in the first embodiment of this utility model;

[0038] Figure 3 This is a circuit diagram of a self-protection circuit provided in the second embodiment of this utility model;

[0039] Figure 4This is a circuit diagram of a self-protection circuit provided in the third embodiment of this utility model.

[0040] The components are: 1. Intelligent power module, 11. Inverter output terminal, 12. Overcurrent detection input terminal, 2. Motor chip, 3. Motor load, 4. Current detection module, 5. Protection trigger signal output terminal, and 6. Motor current detection resistor. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] In the motor drive circuit built on the basis of the intelligent power module, the intelligent power module 1 integrates a three-phase inverter bridge composed of power devices such as IGBTs or MOSFETs, a drive circuit, overcurrent / overheat protection logic and signal interface, and is responsible for converting DC power such as lithium battery and rectified mains power into three-phase AC power to drive the motor.

[0043] In addition, the motor drive circuit also includes a motor drive chip 4 and a motor load 5. The motor drive chip, as the control core of the intelligent power module, can control the switching sequence of the power circuit within the intelligent power module via PWM signals, thereby adjusting the frequency and amplitude of its output voltage and realizing functions such as motor speed regulation and forward / reverse rotation. The motor load is typically a three-phase asynchronous motor or a permanent magnet synchronous motor, which can be connected to the inverter output terminal of the intelligent power module via the UVW three-phase lines to receive alternating current and generate a rotating magnetic field.

[0044] Under abnormal operating conditions such as motor stall, sudden load change, and winding short circuit, the UVW phase current will surge instantaneously. However, the power devices inside the intelligent power module have limited current and heat resistance. If the overcurrent continues for a certain period of time, the power devices will burn out due to Joule heat accumulation, causing the entire drive circuit to fail. Therefore, it is necessary to monitor the overcurrent situation in the motor drive circuit in real time and take corresponding protective measures to ensure the operational reliability of the intelligent power module and the operational safety of the motor drive circuit.

[0045] Intelligent power modules typically also have a CIN pin. The intelligent power module can determine whether there is an overcurrent or short circuit based on the input voltage of the CIN pin. If the input voltage exceeds the threshold and continues for a certain period of time, it will trigger a protection mechanism to shut down the corresponding power device.

[0046] Based on the overvoltage cutoff protection logic of the intelligent power module, such as Figure 1 As shown, in the first embodiment of this utility model, a self-protection circuit based on overcurrent detection is provided, which is connected to the intelligent power module in the motor drive circuit, including a current detection module 2 and a protection trigger signal output terminal 3.

[0047] The current detection module includes a first sampling resistor R1 and a second sampling resistor R2, which are connected in series and connected to the inverter output terminal 11 of the intelligent power module.

[0048] The protection trigger signal output terminal is located between the first sampling resistor R1 and the second sampling resistor R2 and connected to the overcurrent detection input terminal 12 of the intelligent power module.

[0049] The current detection module specifically uses a first sampling resistor R1 and a second sampling resistor R2 to sample the motor current. The first sampling resistor R1 and the second sampling resistor R2 are connected in series according to a specific resistance ratio based on actual needs. The series circuit is then directly connected to the inverter output terminal of the intelligent power module to form a series relationship with the motor drive circuit, thereby sensing the changes in motor current in the circuit in real time.

[0050] Specifically, the protection trigger signal output terminal, which provides feedback on the motor current changes in the motor drive circuit, is located at the connection node of the first sampling resistor R1 and the second sampling resistor R2. When the motor drive circuit is operating normally, the motor drive current flows through the series-connected first sampling resistor R1 and the second sampling resistor R2. According to Ohm's law, this generates a voltage drop across both resistors. Since the first sampling resistor R1 and the second sampling resistor R2 are connected in series, the current flowing through them is the same. Therefore, the voltage at the node between the first sampling resistor R1 and the second sampling resistor R2, i.e., the output voltage of the protection trigger signal output terminal, is directly proportional to the current in the motor drive circuit. Based on this, this voltage signal is used as the protection trigger signal input to the overcurrent detection input terminal of the intelligent power module, forming the transmission path for the protection signal. Combined with the overvoltage cutoff protection logic of the intelligent power module, the corresponding overcurrent detection and protection measures can be automatically activated.

[0051] When the motor experiences abnormal conditions such as overload or stall, these abnormalities cause the current in the motor drive circuit to exceed the normal range. The motor current flowing through the first sampling resistor R1 and the second sampling resistor R2 will also increase, causing the output voltage at the protection trigger signal output terminal to rise. When this output voltage exceeds the cutoff voltage threshold set internally at the overcurrent detection input terminal of the intelligent power module, the intelligent power module will immediately trigger its overvoltage cutoff protection mechanism, stopping the output of the drive signal to the motor, thereby cutting off the circuit current and protecting the intelligent power module and the motor from overcurrent damage.

[0052] This embodiment constructs a complete overcurrent detection and protection triggering link using only two sampling resistors and a protection trigger signal output terminal, greatly simplifying the protection circuit structure. The protection trigger signal can be transmitted to the overcurrent detection input terminal of the intelligent power module via the shortest path, eliminating the signal processing time of intermediate links such as comparators in traditional solutions. When an overcurrent occurs, the intelligent power module can quickly perform a self-cutoff response. This fast response characteristic can effectively cope with sudden large currents, cutting off the circuit before causing substantial damage to the intelligent power module and motor, significantly improving the timeliness and effectiveness of protection.

[0053] Furthermore, since the protection trigger signal comes directly from the voltage division of the sampling resistor, it can effectively avoid interference and distortion of the signal by intermediate links. This allows the intelligent power module to accurately receive the protection trigger signal that reflects the actual current situation, reducing false protection and leakage protection caused by inaccurate detection signals. This improves the reliability of the self-protection circuit and ensures that the intelligent power module and the motor can operate stably within a safe current range.

[0054] Preferably, in the first embodiment of this utility model, the self-protection circuit further includes:

[0055] The shunt resistor R3 is connected in parallel across the current detection module and connected to the inverter output terminal of the intelligent power module.

[0056] When a motor experiences a short circuit or other fault, a large current is generated. If detection is performed solely through the series circuit of the first sampling resistor R1 and the second sampling resistor R2, the small-value sampling resistor may burn out due to excessive power. Therefore, a smaller shunt resistor R3 is connected in parallel across the current detection module. Based on the characteristics of parallel circuits—equal voltage and current splitting—the total current output from the intelligent power module is divided into two paths: one flows through the shunt resistor R3, and the other flows through the current detection module. The shunt resistor R3 can divert most of the large current, keeping the current flowing through the first sampling resistor R1 and the second sampling resistor R2 within a certain range. This prevents the sampling resistors from being subjected to overcurrent surges and improves the operational safety of the current detection module.

[0057] Furthermore, if the series circuit of the first sampling resistor R1 and the second sampling resistor R2 is used directly for detection, the maximum withstand current of the first sampling resistor R1 and the second sampling resistor R2 will limit the total current range that the self-protection circuit can detect. After connecting the shunt resistor R3, the overcurrent detection range can be effectively broadened, adapting to the overcurrent detection of motors with higher power and meeting their self-protection requirements.

[0058] When setting the shunt resistor R3, the resistance value can also be set according to actual needs.

[0059] With the shunt resistor R3 set, the output voltage at the protection trigger signal output terminal is:

[0060]

[0061] Among them, V CIN To protect the output voltage of the trigger signal output terminal, i.e. to protect the trigger signal, R1 is the resistance value of the first sampling resistor R1, R2 is the resistance value of the second sampling resistor R2, and I is the motor current in the motor drive circuit.

[0062] Preferably, in the first embodiment of this utility model, the self-protection circuit further includes:

[0063] The motor current detection resistor 6 is connected in series between the inverter output terminal of the intelligent power module and the current detection module.

[0064] The voltage signal at the inverter output of the intelligent power module is often high-frequency alternating or pulsating, making it difficult to directly determine the magnitude of the motor current. Therefore, based on the original self-protection circuit that includes a current detection module and a protection trigger signal output, a motor current detection resistor is added. The motor current detection resistor converts the voltage at the inverter output of the intelligent power module into a specific current signal, which then works with the current detection module to achieve the corresponding overcurrent detection.

[0065] Furthermore, in order to achieve motor drive, the inverter output voltage of the intelligent power module is usually high. The first sampling resistor R1 and the second sampling resistor R2 in the current detection module, as well as the overcurrent detection input of the intelligent power module, are low-voltage sensitive circuits. The motor current detection circuit, as a component connected in series between the high-voltage end and the low-voltage sensitive circuit, can use its resistance characteristics to limit the impact of abnormal high voltage on the downstream circuit and improve the overall safety of the circuit.

[0066] Furthermore, the motor current detection resistor includes:

[0067] The first detection resistor R4 is connected in series between the inverter output terminal U-phase output of the intelligent power module and the current detection module.

[0068] The second detection resistor R5 is connected in series between the inverter output terminal V-phase output of the intelligent power module and the current detection module.

[0069] Common faults in industrial motors often manifest as abnormal current in one or two phases. These abnormal signals can be quickly captured by the detection resistors at the U-phase and V-phase outputs of the inverter of the intelligent power module, meeting the overcurrent protection requirements in most scenarios.

[0070] Furthermore, according to Kirchhoff's current law, for a three-phase balanced system, the algebraic sum of the instantaneous values ​​of the three-phase currents is zero. Therefore, by setting the detection current on the U-phase output and V-phase output, the monitoring of the full-phase current of the motor drive circuit can be realized.

[0071] This method, which covers the monitoring needs of three-phase current through two-phase detection, can achieve accurate fault diagnosis and protection, while avoiding the redundant design of three-phase detection. It simplifies circuit design and saves the cost of the overall self-protection circuit while realizing full-phase current monitoring of the motor drive circuit.

[0072] Preferably, in the first embodiment of this utility model, the overcurrent detection input terminal of the intelligent power module is further provided with a cutoff voltage threshold that triggers the intelligent power module to self-cut off.

[0073] In the first embodiment, the cutoff voltage threshold set in the overcurrent detection input terminal of the intelligent power module is 0.5V. This cutoff voltage threshold can also be adjusted according to the selection of the intelligent power module or the overcurrent protection requirements.

[0074] The overall circuit diagram of the self-protection circuit described in the first embodiment of this utility model is as follows: Figure 2 As shown, Figure 2 It also includes the IPM chip corresponding to the intelligent power module.

[0075] The second embodiment of this utility model is a further preferred embodiment based on the first embodiment. In the second embodiment of this utility model, the self-protection circuit further includes:

[0076] An adjustable resistor RP is connected in parallel across the first sampling resistor R1.

[0077] The adjustable resistor RP can be a potentiometer, a digital adjustable resistor RP, or other resistors with adjustable resistance values. By changing the resistance value of the adjustable resistor RP, the ratio between the output voltage of the protection trigger signal output terminal and the motor current can be dynamically adjusted, that is, the trigger threshold of the overcurrent protection can be adjusted.

[0078] The maximum allowable current of a motor varies depending on the operating scenario. For example, it needs to withstand a short-term high current during startup, while the threshold needs to be lower during normal operation. Motors with different load characteristics also have different overcurrent protection requirements.

[0079] Therefore, by adjusting the resistance value of the adjustable resistor RP, the self-protection circuit can be adapted to motors with different load characteristics as well as to different operating stages of the same motor, without the need to replace hardware such as the first sampling resistor R1 and the second sampling resistor R2, which can effectively improve the versatility of the self-protection circuit.

[0080] Furthermore, the adjustable resistor RP is connected in parallel across the first sampling resistor R1. When the first sampling resistor R1 is burned out due to overcurrent or short circuit, it can also serve as a backup resistor to maintain the basic function of the self-protection circuit and improve the operational reliability of the self-protection circuit.

[0081] The overall circuit diagram of the self-protection circuit described in the second embodiment of this utility model is as follows: Figure 3 As shown.

[0082] The third embodiment of this utility model is a further preferred embodiment based on the second embodiment. In the third embodiment of this utility model, the self-protection circuit further includes:

[0083] The filtering module is connected between the protection trigger signal output terminal and the overcurrent input terminal of the intelligent power module.

[0084] The filtering module can be an RC filter circuit composed of capacitors and capacitor banks, or an LC filter circuit or an active filter circuit can be selected according to actual needs. Taking a common RC filter as an example, its resistor is connected in series between the protection trigger signal output terminal and the overcurrent input terminal of the intelligent power module, one end of the capacitor is connected to the node between its resistor and the overcurrent input terminal of the intelligent power module, and the other end is grounded.

[0085] During transmission, the protection trigger signal may be affected by high-frequency switching noise generated at the inverter output of the intelligent power module, electromagnetic interference during motor operation, and noise from other components in the circuit, resulting in unnecessary high-frequency components mixed in with the signal. The configured filtering module can effectively filter out this high-frequency noise, making the protection trigger signal smoother and more stable, accurately reflecting the true state of the motor current, reducing the probability of false triggering, and ensuring the continuous and stable operation of the motor drive system.

[0086] The overall circuit diagram of the self-protection circuit described in the third embodiment of this utility model is as follows: Figure 4 As shown, it also includes resistor R6 and capacitor C1 of the filter module.

[0087] The working principle of the self-protection circuit in each embodiment of this utility model is as follows:

[0088] The current detection module is connected to the motor drive main circuit through the inverter output terminal of the intelligent power module. When the motor is running, current flows out from the inverter output terminal of the intelligent power module, passes through the sampling resistor of the current detection module, and forms a closed loop. According to Ohm's law, the current generates a voltage drop across the sampling resistor that is proportional to the magnitude of the current. By detecting this voltage drop, the current detection module can indirectly sample the motor current.

[0089] The current detection module samples the motor current in the form of node voltage. At this time, this voltage signal is sent as a protection trigger signal to the overcurrent detection input of the intelligent power module through the protection trigger signal output terminal. When the protection trigger signal received at the overcurrent detection input of the intelligent power module exceeds the cutoff voltage threshold, the intelligent power module is triggered to self-cut off.

[0090] In the fourth embodiment of this utility model, a clothing processing device is also provided, including the self-protection circuit described in any of the above embodiments, and the clothing processing device can be a washing machine, a dryer, or a washer-dryer combo.

[0091] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A self-protection circuit based on overcurrent detection, connected to an intelligent power module in a motor drive circuit, characterized in that, Includes a current detection module and a protection trigger signal output terminal; The current detection module includes a first sampling resistor R1 and a second sampling resistor R2, which are connected in series and connected to the inverter output terminal of the intelligent power module. The protection trigger signal output terminal is located between the first sampling resistor R1 and the second sampling resistor R2 and connected to the overcurrent detection input terminal of the intelligent power module.

2. The self-protection circuit based on overcurrent detection according to claim 1, characterized in that, Also includes: The shunt resistor R3 is connected in parallel across the current detection module and connected to the inverter output terminal of the intelligent power module.

3. The self-protection circuit based on overcurrent detection according to claim 1, characterized in that, Also includes: The motor current detection resistor is connected in series between the inverter output terminal of the intelligent power module and the current detection module.

4. The self-protection circuit based on overcurrent detection according to claim 3, characterized in that, The motor current detection resistor includes: The first detection resistor R4 is connected in series between the inverter output terminal U-phase output of the intelligent power module and the current detection module. The second detection resistor R5 is connected in series between the inverter output terminal V-phase output of the intelligent power module and the current detection module.

5. The self-protection circuit based on overcurrent detection according to claim 1, characterized in that, Also includes: An adjustable resistor RP is connected in parallel across the first sampling resistor R1.

6. The self-protection circuit based on overcurrent detection according to claim 1, characterized in that, The overcurrent detection input terminal of the intelligent power module is also equipped with a cutoff voltage threshold that triggers the intelligent power module to self-turn off.

7. The self-protection circuit based on overcurrent detection according to claim 1, characterized in that, Also includes: The filtering module is connected between the protection trigger signal output terminal and the overcurrent input terminal of the intelligent power module.

8. A garment handling device, characterized in that, include: The self-protection circuit as described in any one of claims 1 to 7.

9. The garment processing apparatus according to claim 8, characterized in that, The garment processing device is a washing machine, a dryer, or a washer-dryer combo.

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