CN218088728U - Overload protection circuit for preventing overweight - Google Patents
Overload protection circuit for preventing overweight Download PDFInfo
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- CN218088728U CN218088728U CN202220566841.9U CN202220566841U CN218088728U CN 218088728 U CN218088728 U CN 218088728U CN 202220566841 U CN202220566841 U CN 202220566841U CN 218088728 U CN218088728 U CN 218088728U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model discloses an overweight overload protection circuit, which comprises a control module, a motor driving module, a switch module, an overload prompting module, a current detection module and a power supply module; the input end of the switch module is electrically connected with the power supply module, the output end of the switch module and the input end of the current detection module are both electrically connected with a lifting motor of the clothes airing machine, the control end of the switch module is electrically connected with the output end of the motor driving module, and the input end of the motor driving module and the output end of the current detection module are respectively electrically connected with the control module; the power supply terminals of the switch module, the overload prompting module, the current detection module, the control module and the motor driving module are electrically connected with the power supply module, and the control terminal of the overload prompting module is electrically connected with the control module. Adopt the utility model discloses, can solve the problem that the mechanical structure that exists is complicated, the installation is troublesome and the reliability is poor among the prior art.
Description
Technical Field
The utility model relates to a bathroom field especially relates to an overweight overload protection circuit of preventing.
Background
At present, equipment with an overweight overload protection function, such as a clothes airing machine, in the bathroom market is mainly protected by detecting that the weight of clothes hung on the clothes airing machine exceeds the load capacity of the clothes airing machine through a mechanical structure. The mechanical structure of the schemes is complex, the complexity of production and installation is increased, and the product cost is high.
The other scheme is that the signal is amplified by an amplifier through a series resistor and then detected. After the sampling resistor is heated or the sampling resistor is used for a long time, the resistance value is changed due to aging, and the detection result is influenced. The detection signal is easily interfered by the ground wire, and detection errors are easily caused. The scheme has the problems of large temperature drift, easy interference and poor reliability, so a new detection scheme is necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an overweight overload protection circuit is provided, the problem that the mechanical structure that exists is complicated, the installation is troublesome and the reliability is poor among the prior art can be solved.
In order to solve the technical problem, the utility model provides an overweight-prevention overload protection circuit, which comprises a control module, a motor driving module, a switch module, an overload prompting module, a current detection module and a power supply module; the input end of the switch module is electrically connected with the power supply module, the output end of the switch module and the input end of the current detection module are both electrically connected with a lifting motor of the clothes airing machine, the control end of the switch module is electrically connected with the output end of the motor driving module, and the input end of the motor driving module and the output end of the current detection module are respectively electrically connected with the control module; the power supply terminals of the switch module, the overload prompting module, the current detection module, the control module and the motor driving module are electrically connected with the power supply module, the control terminal of the overload prompting module is electrically connected with the control module, and the output terminal of the overload prompting module is grounded.
Preferably, the current detection module includes a current detection unit, a first filtering unit, a second filtering unit and a first current limiting unit; an input pin and a power supply pin of the current detection unit are respectively an input end and a power supply end of the current detection module, one end of the first current limiting unit is an output end of the current detection module and is grounded through the second filtering unit, and the other end of the first current limiting unit is electrically connected with an output pin of the current detection unit; and a filtering pin of the current detection unit is grounded through the first filtering unit.
Preferably, the switch module comprises a first relay unit and a second relay unit; the movable contact pins of the first relay unit and the second relay unit are electrically connected with the power supply module, the normally open pins of the first relay unit and the second relay unit are electrically connected with the input end of the current detection module, the coil input pins of the first relay unit and the second relay unit are electrically connected with the power supply module, the coil output pins of the first relay unit and the second relay unit are respectively electrically connected with the output end of the motor driving module, the normally closed pin of the first relay unit is electrically connected with one end of the lifting motor, and the normally closed pin of the second relay unit is electrically connected with the other end of the lifting motor.
Preferably, the overload prompting module comprises a buzzer unit, a first switch unit and an indicator light unit; the input end of the first switch unit is electrically connected with one end of the buzzer unit, the other end of the buzzer unit is electrically connected with the power supply module, the output end of the first switch unit is grounded, and the control end of the first switch unit is electrically connected with the control module; the indicating lamp unit comprises an LED indicating lamp, a first current-limiting resistor and a second current-limiting resistor, a first pin of the LED indicating lamp is electrically connected with the control module through the first current-limiting resistor, a second pin of the LED indicating lamp is electrically connected with the control module through the second current-limiting resistor, and a third pin of the LED indicating lamp is grounded.
Preferably, the first switching unit includes a first switching tube and a third current limiting resistor; the input end and the output end of the first switch tube are respectively the input end and the output end of the first switch unit; one end of the third current-limiting resistor is the control end of the first switch unit, and the other end of the third current-limiting resistor is electrically connected with the control end of the first switch tube.
Preferably, the power supply module comprises a power supply, a first voltage conversion module and a second voltage conversion module; the input ends of the first voltage conversion module and the switch module are electrically connected with the power supply, the power ends of the switch module and the motor driving module and the input end of the second voltage conversion module are electrically connected with the output end of the first voltage conversion module, and the output end of the second voltage conversion module is electrically connected with the power ends of the control module, the overload prompting module and the current detection module.
Preferably, the first voltage conversion module includes a first buck switching regulator unit, a first input filtering unit, and a first output filtering unit; the input end of the first buck switching regulator unit is the input end of the first voltage conversion module and is grounded through the first input filtering unit; the output end of the first step-down switching regulator unit is the output end of the first voltage conversion module and is grounded through the first output filtering unit.
Preferably, the second voltage conversion module includes a second buck switching regulator unit, a second input filtering unit, and a second output filtering unit; the input end of the second buck switching regulator unit is the input end of the second voltage conversion module and is grounded through the second input filtering unit; the output end of the second step-down switching regulator unit is the output end of the second voltage conversion module and is grounded through the second output filtering unit.
Preferably, the power supply module further includes a voltage detection unit, one end of the voltage detection unit is electrically connected to the power supply, and the other end of the voltage detection unit is electrically connected to the control module.
Preferably, the overweight and overload protection circuit further comprises a wireless communication module, and the wireless communication module is electrically connected with the power supply module and the control module.
Implement the utility model has the advantages that:
the utility model discloses, the input of switch module with power module electric connection, the output of switch module and the input of current detection module all with the elevator motor electric connection of airing machine, the control end of switch module with the output of motor drive module electric connection, the input of motor drive module and the output of current detection module respectively with control module electric connection; the power supply terminals of the switch module, the overload prompting module, the current detection module, the control module and the motor driving module are electrically connected with the power supply module, the control terminal of the overload prompting module is electrically connected with the control module, and the output terminal of the overload prompting module is grounded.
The utility model can solve the problems of complex mechanical structure, troublesome installation and poor reliability existing in the prior art; when the motor runs, a loop generates a current, the magnitude of the current is related to the weight of things pulled by the equipment and the running direction of the motor, and the larger the weight is, the larger the current is generated when the pulling is increased. The current detection module converts a current signal in the loop into a voltage signal which can be measured by the singlechip, and the voltage signal passes through a resistor, is filtered by a capacitor of the filter circuit and then enters an analog input pin of the singlechip. When the motor pulls the clothes hanger to ascend, the main control single chip microcomputer compares the value with the preset value after reading the sampling signal, when the sampling value is larger than the preset value, the clothes airing machine is considered to be overloaded, meanwhile, the motor is controlled to stop running through the output signal, and the load prompt of the clothes airing machine is made through the overload prompt module.
Drawings
Fig. 1 is a schematic block diagram of an overload protection circuit for preventing overload;
fig. 2 is a schematic circuit diagram of a current detection module provided by the present invention;
fig. 3 is a schematic circuit diagram of a switch module provided by the present invention;
fig. 4 is a schematic block diagram of a buzzer unit provided by the present invention;
fig. 5 is a schematic circuit diagram of an indicator light unit provided by the present invention;
fig. 6 is a schematic circuit diagram of a first switch unit provided by the present invention;
fig. 7 is a schematic block diagram of a power supply module provided by the present invention;
fig. 8 is a schematic circuit diagram of a first voltage conversion module provided by the present invention;
fig. 9 is a schematic circuit diagram of a second voltage conversion module provided by the present invention;
fig. 10 is another schematic block diagram of a power supply module provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.
As shown in fig. 1, the present invention provides an overweight overload protection circuit, preferably applied to a clothes drying machine, and in other embodiments, the overweight overload protection circuit can also be used in equipment such as an intelligent towel rack, and the circuit mainly includes a control module 1, a motor driving module 4, a switch module 5, an overload prompting module 2, a current detection module 6, and a power supply module 3; the input end of the switch module 5 is electrically connected with the power supply module 3, the output end of the switch module 5 and the input end of the current detection module 6 are both electrically connected with a lifting motor of a clothes airing machine, the control end of the switch module 5 is electrically connected with the output end of the motor drive module 4, and the input end of the motor drive module 4 and the output end of the current detection module 6 are respectively electrically connected with the control module 1; the power ends of the switch module 5, the overload prompting module 2, the current detection module 6, the control module 1 and the motor driving module 4 are all electrically connected with the power supply module 3, the control end of the overload prompting module 2 is electrically connected with the control module 1, and the output end of the overload prompting module 2 is grounded.
It should be noted that the control module 1 is a single chip microcomputer U1, but is not limited thereto; the singlechip integrates various components such as an arithmetic unit, a controller, a memory, an input/output device and the like, and realizes various functions such as signal processing, data storage and the like. For example, an arithmetic unit includes a large number of comparison circuits, and can perform logical operation processing on a received signal instruction.
The utility model discloses, the input of switch module 5 with power module 3 electric connection, the output of switch module 5 and the input of current detection module 6 all with the elevator motor electric connection of airing machine, the control end of switch module 5 with the output of motor drive module 4 electric connection, the input of motor drive module 4 and the output of current detection module 6 respectively with control module 1 electric connection; the power ends of the switch module 5, the overload prompting module 2, the current detection module 6, the control module 1 and the motor driving module 4 are all electrically connected with the power supply module 3, the control end of the overload prompting module 2 is electrically connected with the control module 1, and the output end of the overload prompting module 2 is grounded. Adopt the utility model discloses, can solve the problem that the mechanical structure that exists is complicated, the installation is troublesome and the reliability is poor among the prior art.
Specifically, when the motor is operated, a loop of the motor generates a current, the magnitude of the current is related to the weight of clothes pulled by the clothes airing machine and the operation direction of the motor, and the larger the traction is, the larger the weight is, the larger the current is generated. The current detection module 6 converts the current signal in the loop into a voltage signal which can be measured by the singlechip, and the voltage signal passes through a resistor, is filtered by a capacitor of a filter circuit and then enters an analog input pin of the singlechip. When the motor pulls the clothes hanger to ascend, the main control single chip microcomputer compares the value with the preset value after reading the sampling signal, when the sampling value is larger than the preset value, the clothes airing machine is considered to be overloaded, meanwhile, the motor is controlled to stop running through the output signal, and the load prompt of the clothes airing machine is made through the overload prompt module 2.
As shown in fig. 2, the current detection module 6 includes a current detection unit IC3, a first filtering unit C1, a second filtering unit C3, and a first current limiting unit R1; an input pin and a power pin of the current detection unit IC3 are respectively an input end and a power end of the current detection module 6, one end of the first current limiting unit R1 is an output end of the current detection module 6 and is grounded through the second filtering unit C3, and the other end of the first current limiting unit R1 is electrically connected with an output pin of the current detection unit IC 3; the filtering pin of the current detection unit IC3 is grounded through the first filtering unit C1.
It should be noted that, in this embodiment, the current detection unit IC3 is used to detect the operating current of the clothes drying machine, and the first filtering unit C1 and the second filtering unit C3 are used to filter noise in the circuit to improve the stability of the circuit, and the first current limiting unit R1 is used to limit the current to avoid burning out the current detection unit IC3. Specifically, the current detection unit comprises a conversion unit, the current detection unit converts a current signal in the loop into a voltage signal which can be measured by the singlechip through the conversion unit, and the voltage signal enters an analog quantity input pin of the singlechip after passing through a resistor and being filtered by a capacitor of the filter circuit.
As shown in fig. 3, the switch module 5 includes a first relay unit REY5 and a second relay unit REY6; the movable contact pins of the first relay unit REY5 and the second relay unit REY6 are electrically connected with the power supply module 3 (+ 24V), the normally open pins of the first relay unit REY5 and the second relay unit REY6 are electrically connected with the input end (Current) of the Current detection module 6, the coil input pins of the first relay unit REY5 and the second relay unit REY6 are electrically connected with the power supply module 3 (+ 12V), the coil output pins of the first relay unit REY5 and the second relay unit REY6 are electrically connected with the output end of the motor driving module IC7, the normally closed pin of the first relay unit REY5 is electrically connected with one end of the lifting motor CN15, and the normally closed pin of the second relay unit REY6 is electrically connected with the other end of the lifting motor CN 15.
It should be noted that in this embodiment, the current is from 24V, then through the contacts of the relay, then through one pole of the motor, then from the other pole, and then back to GND. The relay used in the method is a single-pole double-throw relay, one of the contacts is controlled to be switched on by controlling the switching-on condition of the relay, and the two relays are adopted to control the polarity of a power supply connected with the two poles of the motor, so that the forward and reverse rotation of the motor can be realized. Because the single chip pin can not directly drive the relay, the single chip pin controls the drive chip IC7 to further control the relay.
As shown in fig. 4, the overload prompting module 2 includes a buzzer unit 21, a first switch unit 22, and an indicator light unit (not labeled); the input end of the first switch unit 22 is electrically connected with one end of the buzzer unit 21, the other end of the buzzer unit 21 is electrically connected with the power supply module 3, the output end of the first switch unit 22 is grounded, and the control end of the first switch unit 22 is electrically connected with the control module 1. As shown in fig. 5, the indicator light unit includes an LED indicator light CON3, a first current limiting resistor R44, and a second current limiting resistor R45, wherein a first pin of the LED indicator light CON3 is electrically connected to the control module 1 through the first current limiting resistor R44, a second pin of the LED indicator light CON3 is electrically connected to the control module 1 through the second current limiting resistor R45, and a third pin of the LED indicator light CON3 is grounded.
It should be noted that in this embodiment, the operating state of the buzzer unit or the indicator light unit is controlled by controlling the on-off state of the first switch unit 22, and when the overload of the clothes drying machine is detected, the user is reminded to take away excessive clothes by driving the sound of the droplet of the buzzer for a period of time, so as to avoid damaging the clothes drying machine.
As shown in fig. 6, the first switch unit 22 includes a first switch tube Q2 and a third current limiting resistor R13; the input end and the output end of the first switch tube Q2 are respectively the input end and the output end of the first switch unit 22; one end of the third current limiting resistor R13 is a control end of the first switch unit 22, and the other end is electrically connected to the control end of the first switch tube Q2.
In this embodiment, the on-off state of the first switch unit is controlled by controlling the on-state of the first switch Q2, and the current is limited by the third current limiting resistor R13 to avoid burning out the first switch Q2.
As shown in fig. 7, the power supply module 3 includes a power supply 31, a first voltage conversion module 32, and a second voltage conversion module 33; the input ends of the first voltage conversion module 32 and the switch module 5 are electrically connected to the power supply 31, the power ends of the switch module 5 and the motor driving module 4 and the input end of the second voltage conversion module 33 are electrically connected to the output end of the first voltage conversion module 32, and the output end of the second voltage conversion module 33 is electrically connected to the power ends of the control module 1, the overload prompting module 2 and the current detection module 6.
In this embodiment, the first voltage conversion module 32 and the second voltage conversion module 33 convert the working voltage to obtain a working voltage suitable for each subsequent module, so as to ensure normal power consumption of each module.
As shown in fig. 8, the first voltage conversion module 32 includes a first buck switching regulator unit IC1, a first input filter unit (composed of a capacitor C4), and a first output filter unit (composed of capacitors C3, C7, C9, and EC1, and resistors R10 and R50, and an inductor L2); the input end of the first buck switching regulator unit IC1 is the input end of the first voltage conversion module 32 and is grounded through the first input filter unit; the output end of the first buck switching regulator unit IC1 is the output end of the first voltage conversion module 32 and is grounded through the first output filter unit.
It should be noted that, in this embodiment, the first buck switching regulator unit IC1 performs conversion to obtain an operating voltage suitable for a subsequent module, and the first input filtering unit (composed of a capacitor C4) and the first output filtering unit (composed of capacitors C3, C7, C9, and EC1, resistors R10 and R50, and an inductor L2) filter noise in a circuit to improve stability of power supply.
As shown in fig. 9, the second voltage conversion module 33 includes a second buck switching regulator unit IC2, a second input filter unit (not shown, composed of a filter capacitor), and a second output filter unit (composed of capacitors C19, C25, C26, and EC3, and resistors R51 and R52, and an inductor L4); the input end of the second buck switching regulator unit IC2 is the input end of the second voltage conversion module 33 and is grounded through the second input filter unit; the output end of the second buck switching regulator unit IC2 is the output end of the second voltage conversion module 33 and is grounded through the second output filter unit.
It should be noted that, in this embodiment, the second buck switching regulator unit IC2 converts to obtain a working voltage suitable for a subsequent module, and the second input filter unit (not shown, composed of a filter capacitor) and the second output filter unit (composed of capacitors C19, C25, C26, and EC3, resistors R51 and R52, and an inductor L4) filter noise in a circuit to improve the stability of power supply.
As shown in fig. 10, the power supply module 3 further includes a voltage detection unit 34, one end of the voltage detection unit 34 is electrically connected to the power supply 31, and the other end of the voltage detection unit 34 is electrically connected to the control module 1.
It should be noted that, in this embodiment, the voltage detection unit 34 detects the voltage signal of the power supply in real time and obtains the remaining power amount thereof through the control module, and when the remaining power amount is smaller than the preset power amount, a low power alarm is performed to remind the user of performing maintenance, thereby ensuring normal use of the product.
Preferably, the overload protection circuit further includes a wireless communication module (not labeled), and the wireless communication module is electrically connected to the power supply module and the control module.
It should be noted that, in this embodiment, the user can be at the customer ends such as cell-phone via wireless communication module with control module 1 establishes communication connection, thereby can be long-range right the utility model discloses the product is monitored to can in time handle proruption situation.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. An overweight and overload prevention protection circuit is characterized by comprising a control module, a motor driving module, a switch module, an overload prompting module, a current detection module and a power supply module;
the input end of the switch module is electrically connected with the power supply module, the output end of the switch module and the input end of the current detection module are both electrically connected with a lifting motor of the clothes airing machine, the control end of the switch module is electrically connected with the output end of the motor driving module, and the input end of the motor driving module and the output end of the current detection module are respectively electrically connected with the control module;
the power supply terminals of the switch module, the overload prompting module, the current detection module, the control module and the motor driving module are electrically connected with the power supply module, the control terminal of the overload prompting module is electrically connected with the control module, and the output terminal of the overload prompting module is grounded.
2. The overload protection circuit according to claim 1, wherein the current detection module comprises a current detection unit, a first filtering unit, a second filtering unit and a first current limiting unit;
an input pin and a power supply pin of the current detection unit are respectively an input end and a power supply end of the current detection module, one end of the first current limiting unit is an output end of the current detection module and is grounded through the second filtering unit, and the other end of the first current limiting unit is electrically connected with an output pin of the current detection unit;
and a filtering pin of the current detection unit is grounded through the first filtering unit.
3. The overload protection circuit of claim 1, wherein the switch module includes a first relay unit and a second relay unit;
the movable contact pins of the first relay unit and the second relay unit are electrically connected with the power supply module, the normally open pins of the first relay unit and the second relay unit are electrically connected with the input end of the current detection module, the coil input pins of the first relay unit and the second relay unit are electrically connected with the power supply module, the coil output pins of the first relay unit and the second relay unit are electrically connected with the output end of the motor driving module respectively, the normally closed pin of the first relay unit is electrically connected with one end of the lifting motor, and the normally closed pin of the second relay unit is electrically connected with the other end of the lifting motor.
4. The overload protection circuit according to claim 1, wherein the overload prompting module comprises a buzzer unit, a first switch unit and an indicator light unit;
the input end of the first switch unit is electrically connected with one end of the buzzer unit, the other end of the buzzer unit is electrically connected with the power supply module, the output end of the first switch unit is grounded, and the control end of the first switch unit is electrically connected with the control module;
the indicating lamp unit comprises an LED indicating lamp, a first current-limiting resistor and a second current-limiting resistor, a first pin of the LED indicating lamp is electrically connected with the control module through the first current-limiting resistor, a second pin of the LED indicating lamp is electrically connected with the control module through the second current-limiting resistor, and a third pin of the LED indicating lamp is grounded.
5. The overload protection circuit according to claim 4, wherein the first switching unit comprises a first switching tube and a third current limiting resistor;
the input end and the output end of the first switch tube are respectively the input end and the output end of the first switch unit;
one end of the third current-limiting resistor is the control end of the first switch unit, and the other end of the third current-limiting resistor is electrically connected with the control end of the first switch tube.
6. The overload protection circuit of claim 1, wherein the power supply module comprises a power supply, a first voltage conversion module, and a second voltage conversion module;
the input ends of the first voltage conversion module and the switch module are electrically connected with the power supply, the power ends of the switch module and the motor driving module and the input end of the second voltage conversion module are electrically connected with the output end of the first voltage conversion module, and the output end of the second voltage conversion module is electrically connected with the power ends of the control module, the overload prompting module and the current detection module.
7. The overload protection circuit for preventing overload according to claim 6, wherein the first voltage converting module comprises a first buck switching regulator unit, a first input filtering unit and a first output filtering unit;
the input end of the first buck switching regulator unit is the input end of the first voltage conversion module and is grounded through the first input filtering unit;
the output end of the first step-down switching regulator unit is the output end of the first voltage conversion module and is grounded through the first output filtering unit.
8. The overload protection circuit for preventing overload according to claim 6, wherein the second voltage converting module comprises a second buck switching regulator unit, a second input filtering unit and a second output filtering unit;
the input end of the second buck switching regulator unit is the input end of the second voltage conversion module and is grounded through the second input filtering unit;
the output end of the second step-down switching regulator unit is the output end of the second voltage conversion module and is grounded through the second output filtering unit.
9. The overload protection circuit as claimed in claim 6, wherein the power supply module further comprises a voltage detection unit, one end of the voltage detection unit is electrically connected to the power supply, and the other end of the voltage detection unit is electrically connected to the control module.
10. The overload protection circuit according to any one of claims 1 to 9, further comprising a wireless communication module, wherein the wireless communication module is electrically connected to the power supply module and the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220566841.9U CN218088728U (en) | 2022-03-15 | 2022-03-15 | Overload protection circuit for preventing overweight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220566841.9U CN218088728U (en) | 2022-03-15 | 2022-03-15 | Overload protection circuit for preventing overweight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218088728U true CN218088728U (en) | 2022-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220566841.9U Active CN218088728U (en) | 2022-03-15 | 2022-03-15 | Overload protection circuit for preventing overweight |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218088728U (en) |
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- 2022-03-15 CN CN202220566841.9U patent/CN218088728U/en active Active
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