CN218771262U - Overcurrent protection circuit, motor drive device and electrical device - Google Patents
Overcurrent protection circuit, motor drive device and electrical device Download PDFInfo
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- CN218771262U CN218771262U CN202220747132.0U CN202220747132U CN218771262U CN 218771262 U CN218771262 U CN 218771262U CN 202220747132 U CN202220747132 U CN 202220747132U CN 218771262 U CN218771262 U CN 218771262U
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Abstract
The application relates to the field of electronic circuits, in particular to an overcurrent protection circuit, motor driving equipment and electrical equipment. The overcurrent protection circuit comprises a control module and a detection module; the detection module is respectively connected with the load and the control module and is used for detecting the current flowing through the load and sending a stop signal to the control module when the average value of the current flowing through the load is greater than a preset safe average value and lasts for a first preset time period or when the instantaneous value of the current flowing through the load is greater than a preset safe instantaneous value and lasts for a second preset time period; the control module is respectively connected with the load and the power supply, and controls the load to stop working when receiving the stop signal. The protection circuit solves the technical problems that the traditional overcurrent protection circuit is single in protection mode and incomplete in protection, improves the safety of load work, and is simple in circuit structure and easy to realize.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to an overcurrent protection circuit, a motor driving device and an electrical device.
Background
The application scenes of the motor are very wide, and the motor is applied to a plurality of automatic devices, for example, a wire feeding motor on the existing welding and cutting device realizes the accurate control of wire feeding speed, wire feeding process and the like by the drive control of the motor. In order to prevent the motor from generating circuit safety accidents caused by the failure, an overcurrent protection circuit is arranged for the motor, and when the motor fails, the output current of the motor is limited not to be too large, so that the motor and related components are protected. The current limiting protection circuit of the existing motor can only trigger current limiting protection when the motor is abnormal, the limiting current is overlarge, the motor or components and parts can still be damaged when the motor works for a long time under the larger limiting current, and the motor can also be damaged when the current of the motor is larger than the safe working current but smaller than the limiting current due to the motor abnormality, and the motor works in an overload mode for a long time.
Therefore, the existing motor overcurrent protection circuit has the technical problems of single protection mode and incomplete protection.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present application provides an overcurrent protection circuit, a motor driving device, and an electrical device, and aims to solve the technical problems that a traditional overcurrent protection circuit has a single protection mode and is not comprehensive in protection.
A first aspect of an embodiment of the present application provides an overcurrent protection circuit, including a control module and a detection module;
the detection module is respectively connected with the load and the control module and is used for detecting the current flowing through the load and sending a stop signal to the control module when the average value of the current flowing through the load is greater than a preset safe average value and lasts for a first preset time length or when the instantaneous value of the current flowing through the load is greater than a preset safe instantaneous value and lasts for a second preset time length;
the control module is respectively connected with a load and a power supply, and is used for connecting the power supply to the load and controlling the working state of the load; and the control module controls the load to stop working when receiving the stop signal.
In one embodiment, the control module comprises a control unit and a load adjusting unit, wherein the control unit is connected with the power supply, and the load adjusting unit is connected with the control unit, the power supply and the load;
the control unit is used for controlling the load to stop working through the load adjusting unit when the stop signal is received;
the control unit is also used for sending a starting signal, a braking signal and a speed change signal to the load adjusting unit so as to respectively control the load to start, brake and change speed.
In one embodiment, the detection module comprises a current detection unit and a judgment unit;
the current detection unit is connected with the load and used for converting the current flowing through the load into a voltage signal and sending the voltage signal to the judgment unit;
the judging unit is connected with the control module and used for judging whether the average value of the current flowing through the load and the average value of the current flowing through the load are larger than a preset value and last for a preset time according to the voltage signal.
In one embodiment, the current detection unit comprises a sampling resistor, a voltage division branch and a signal amplification branch;
one end of the sampling resistor is connected with the load, the other end of the sampling resistor is grounded, and the sampling resistor is used for converting the current flowing through the load into the voltage signal;
one end of the voltage division branch is connected with one end of the sampling resistor, and the other end of the voltage division branch is grounded;
the signal amplification branch is connected with the sampling resistor and the voltage division branch and used for outputting the voltage signal to the judgment unit after in-phase amplification.
In one embodiment, the signal amplification branch comprises an amplifier, a first filter resistor, a second filter resistor, a first filter capacitor, a second filter capacitor, a first limiting diode and a second limiting diode;
the first end of the first filter resistor is connected with the output end of the amplifier, the second end of the first filter resistor is connected with the first end of the first filter capacitor, the cathode of the first limiting diode and the anode of the second limiting diode together and connected to the judging unit, the second end of the first filter capacitor is grounded, the anode of the first limiting diode is grounded, and the cathode of the second limiting diode is connected with a voltage source;
the first end of the second filter resistor is connected with the voltage dividing branch, the second end of the second filter resistor is connected with the first end of the second filter capacitor and the non-inverting input end of the amplifier, and the second end of the second filter capacitor is grounded.
In one embodiment, the voltage dividing branch comprises a first voltage dividing resistor, a first end of the first voltage dividing resistor is connected with a first end of the second filter resistor and is connected with the load, and a second end of the first voltage dividing resistor is grounded.
In one embodiment, the device further comprises a current limiting protection module;
the current-limiting protection module is respectively connected with the load and the control module and is used for sending a current-limiting signal to the control module when detecting that the current flowing through the load is greater than a preset current-limiting value;
the control module is also used for limiting the output current of the load to be a set value when the current limiting signal is received.
In one embodiment, the current-limiting protection module comprises a comparator, a third filter resistor, a third filter capacitor and a second voltage-dividing resistor;
one end of the second voltage-dividing resistor is connected with the load and is connected with one end of the third filter resistor, the other end of the second voltage-dividing resistor is grounded, the other end of the third filter resistor is connected with one end of the third filter capacitor and is connected with the comparator, and the other end of the third filter capacitor is grounded;
the comparator is also connected with a voltage stabilizing source and used for comparing the voltage of the voltage stabilizing source with the sampling voltage at one end of the second voltage dividing resistor.
A second aspect of the embodiments of the present application provides a motor driving apparatus including the overcurrent protection circuit in any one of the embodiments.
A third aspect of the embodiments of the present application provides an electric apparatus including the motor drive apparatus and the motor provided by the second aspect of the embodiments of the present application.
The overcurrent protection circuit in this application passes through detection module detects the electric current that flows through the load, appears when unusual the electric current that leads to flowing through the load and surpasss preset safe current average value or safe electric current instantaneous value at the load, sends stop signal and gives control module, control module is receiving control during the stop signal load stop work prevents that load work from causing components and parts to damage under the heavy current condition, improves the security of motor work, and circuit structure is simple and easily realizes.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of an overcurrent protection circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of an overcurrent protection circuit according to another embodiment of the present application;
fig. 3 is a schematic diagram of an overcurrent protection circuit according to another embodiment of the present application;
fig. 4 is a schematic diagram of an overcurrent protection circuit according to another embodiment of the present application;
fig. 5 is a schematic circuit diagram of a detection module in an overcurrent protection circuit according to an embodiment of the present application;
fig. 6 is a schematic circuit diagram of an overcurrent protection circuit including a current-limiting protection module according to another embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in operation as a limitation of the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
As shown in fig. 1, a first aspect of the present application provides an overcurrent protection circuit, which includes a control module 100 and a detection module 200.
The detection module 200 is connected to the load M and the control module 100, respectively, and the detection module 200 is configured to detect a current flowing through the load M, and send a stop signal to the control module 100 when a current average value flowing through the load M is greater than a preset safe average value and lasts for a first preset time period, or when a current instantaneous value flowing through the load M is greater than a preset safe instantaneous value and lasts for a second preset time period.
The control module 100 is respectively connected to the load M and the power source Vin, the control module 100 is configured to connect the power source Vin to the load M and control a working state of the load M, and the control module 100 controls the load M to stop working when receiving a stop signal from the detection module 200. The preset safe current average value here is, for example, a safe current value flowing through the load M when the load M is continuously operated, and the current value may cause a safety problem to the load M after being continuously operated for a certain time period, that is, after being continuously operated for a first preset time period. The preset safety current instantaneous value here is, for example, a safety current value flowing through the load M in a short time when the load M is in operation, and the safety problem of the load M may occur after the current value lasts for a short time period, that is, a second preset time period. The first preset time period is, for example, 5 seconds, 10 seconds, 20 seconds, etc., and the second preset time period is, for example, 10 milliseconds, 50 milliseconds, 100 milliseconds, etc.
In the overcurrent protection circuit provided by the first aspect of the embodiment of the present application, the detection module 200 sends a stop signal to the control module 100 when the current flowing through the load M triggers the safety current average value protection or the safety current instantaneous value protection, and the control module 100 controls the load M to stop working when receiving the stop signal, so as to protect the load M and components in the circuit. When the load M is abnormal under various conditions, the overcurrent protection can be well triggered, the damage of components and parts caused by the work of the load M under the condition of large current is prevented, the work safety of the load M is improved, and the circuit is simple in structure and easy to realize.
Referring to fig. 2, in an embodiment, the control module 100 includes a control unit 110 and a load adjusting unit 120, the control unit 110 is connected to the power source Vin, and the load adjusting unit 120 is connected to the control unit 110, the power source Vin and the load M. The control unit 110 is configured to control the load to stop operating through the load adjusting unit 120 when receiving the stop signal. It is understood that the load adjusting unit 120 is connected to the positive terminal of the load M. The control unit 110 is further configured to send a start signal, a brake signal, and a speed change signal to the load adjusting unit 120, so as to control the load start, the brake, and the speed change, respectively. In one embodiment, the load M is a motor, the load adjusting unit 120 is a motor adjusting unit, and the control unit 110 can control the motor to start, brake, and shift, so as to adjust the operating state of the motor.
Referring to fig. 3, in an embodiment, the detecting module 200 includes a current detecting unit 220 and a determining unit 210, and the current detecting unit 220 is connected to the load M and is configured to convert a current flowing through the load M into a voltage signal and send the voltage signal to the determining unit 210. It is understood that the current detection unit 220 is connected to the negative terminal of the load M to detect the magnitude of the current flowing through the load M and convert the current into a corresponding voltage signal to be input to the determination unit 210. The determining unit 210 is connected to the control module 100, and configured to determine whether the average value and the average value of the current flowing through the load M are greater than a preset value and last for a preset time period according to the voltage signal. The determining unit 210 is, for example, built based on a voltage comparator or an integrated logic circuit, and when the average value of the current flowing through the load M is greater than a preset safe average value and lasts for a first preset time, or when the instantaneous value of the current flowing through the load M is greater than a preset safe instantaneous value and lasts for a second preset time, the determining unit 210 sends a stop signal to the control module 100.
Referring to fig. 4, in an embodiment, the current detecting unit 220 includes a sampling resistor Rg, a voltage dividing branch 221, and a signal amplifying branch 222. One end of the sampling resistor Rg is connected with the load M, the other end of the sampling resistor Rg is grounded, and the sampling resistor Rg is used for converting current flowing through the load M into a voltage signal. One end of the voltage dividing branch 221 is connected with one end of the sampling resistor Rg, the other end of the voltage dividing branch 221 is grounded, and the voltage dividing branch 221 is used for improving the voltage level, so that the voltage signal sampled by one end of the sampling resistor Rg is more stable and accurate. In some embodiments, voltage divider branch 221 may be omitted. The signal amplifying branch 222 is connected to one end of the sampling resistor Rg and the voltage dividing branch 221, and is configured to amplify, in phase, the voltage signal sampled at the end of the sampling resistor Rg and output the amplified voltage signal to the determining unit 210.
Referring to fig. 5, in an embodiment, the signal amplifying branch 222 includes an amplifier a, a first filter resistor R1, a second filter resistor R2, a first filter capacitor C1, a second filter capacitor C2, a first limiting diode D1, and a second limiting diode D2. The first end of the first filter resistor R1 is connected to the output end of the amplifier, the second end of the first filter resistor R1 is connected to the first end of the first filter capacitor C1, the cathode of the first limiting diode D1, and the anode of the second limiting diode D2, and is connected to the determining unit 210, the second end of the first filter capacitor C1 is grounded, the anode of the first limiting diode D1 is grounded, and the cathode of the second limiting diode D2 is connected to the voltage source Vdd. A first end of the second filter resistor R2 is connected to the voltage dividing branch 221, a second end of the second filter resistor R2 is connected to a first end of the second filter capacitor C2 and a non-inverting input terminal of the amplifier a, and a second end of the second filter capacitor C2 is grounded.
The first limiting diode D1 and the second limiting diode D2 play a limiting role, the first filter resistor R1 and the first filter capacitor C1 form a filter circuit to filter a signal output by the amplifier A, and the second filter resistor R2 and the second filter capacitor C2 form a filter circuit to filter an input voltage signal at the non-inverting input end of the amplifier A. Further, referring to fig. 5, one end of the resistor R4 is connected to the output terminal of the amplifier a, the other end of the resistor R4 is connected to the inverting input terminal of the amplifier a, one end of the resistor R5 is connected to the inverting input terminal of the amplifier a, the other end of the resistor R5 is grounded, and the resistor R4 and the resistor R5 serve as feedback and regulation resistors of the amplifier a.
Referring to fig. 5, in an embodiment, the voltage dividing branch 221 includes a first voltage dividing resistor R3, a first end of the first voltage dividing resistor R3 is connected to a first end of the second filter resistor R2 and to the load M, and a second end of the first voltage dividing resistor R3 is grounded. The first voltage dividing resistor R3 is used for improving the voltage level, so that a voltage signal sampled by one end of the sampling resistor Rg is more stable and accurate.
In one embodiment, referring to fig. 6, the overcurrent protection circuit further includes a current limiting protection module 300, the current limiting protection module 300 is connected to the load M and the control module 100, and referring to fig. 6, the current limiting protection module 300 is connected to the load adjusting unit 120 of the control module 100. The current limiting protection module 300 is configured to send a current limiting signal to the control module 100 when detecting that the current flowing through the load M is greater than a preset current limiting value, and the control module 100 is further configured to limit the output current of the load M to a set value when receiving the current limiting signal. The preset limit current value is, for example, a current value at which the load M can operate but the load M can be burned out due to long-time operation under the limit current value, and the limit current value is set so as to set a basic overcurrent protection point, so that the current of the load M is limited to operate under a relatively safe current value, and the load M is prevented from being burned out due to long-time operation under a large current. The current limiting protection of the current limiting protection module 300 and the overcurrent protection of the detection module 200 provide more comprehensive overcurrent protection for the load M.
Referring to fig. 6, in an embodiment, the current limiting protection module 300 includes a comparator 121, a third filter resistor R6, a third filter capacitor C3, and a second voltage dividing resistor Rg, one end of the second voltage dividing resistor Rg is connected to the load M and one end of the third filter resistor R6, the other end of the second voltage dividing resistor Rg is grounded, the other end of the third filter resistor R6 is connected to one end of the third filter capacitor C3 and connected to the comparator 121, the other end of the third filter capacitor C3 is grounded, and the comparator 121 is further connected to a 5V regulator for comparing a voltage of the 5V regulator with a sampling voltage at one end of the second voltage dividing resistor Rg. It can be understood that, in the present embodiment, the second voltage dividing resistor Rg and the sampling resistor Rg are the same resistor.
In some embodiments, the comparator 121 may be provided in the control module. Referring to fig. 6, in an embodiment, the comparator 121 is located in the load adjusting unit 120, and a first input terminal of the comparator 121 is connected to the 5V regulator through a resistor R8, specifically, one end of the resistor R8 of the resistor R7 is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the 5V regulator. The 5V regulated voltage source provides a reference voltage for the comparator 121 after being divided by the resistors R8 and R7. The second input end of the comparator 121 is connected to one end of the third filter capacitor C3, one end of the third filter capacitor C3 is connected to the load M and is connected to one end of the second voltage divider resistor Rg, the other end of the third filter resistor R6 is connected to the second input end of the comparator 121, and the other end of the second voltage divider resistor Rg is grounded. The second voltage dividing resistor Rg is configured to convert a current signal flowing through the load M into a voltage signal, the third filter capacitor C3 and the third filter resistor R6 form a filter circuit, and the voltage signal sampled at one end of the second voltage dividing resistor Rg is filtered and then sent to the second input end of the comparator 121. The comparator 121 compares the voltages at the two input terminals, and when the load M triggers the current limiting protection point, sends a limiting signal to the control unit 110, and the control unit 110 limits the operating current of the load M to a safe set value through the load adjusting unit 120, so as to prevent the load M from being burnt out due to long-time operation under a large current. In some embodiments, the second voltage dividing resistor Rg may not be the same resistor as the sampling resistor Rg, that is, the detection module 200 and the current limiting protection module 300 do not share the resistor Rg.
In the overcurrent protection circuit provided in the first aspect of the embodiment of the present application, the detection module 200 sends a stop signal to the control module 100 when the current flowing through the load M triggers the safety current average value protection or the safety current instantaneous value protection, and the control module 100 controls the load M to stop working when receiving the stop signal, so as to protect the load M and components in the circuit. When the load M is abnormal under various conditions, the overcurrent protection can be well triggered, the damage of components and parts caused by the work of the load M under the condition of large current is prevented, the work safety of the load M is improved, and the circuit is simple in structure and easy to realize.
To better explain the working principle of the overcurrent protection circuit in the embodiment of the present application, referring to fig. 6, a load M is, for example, a motor, when the motor works, the current flowing through the motor is collected by a resistor Rg and converted into a voltage signal, and a comparator 121 obtains the voltage signal through R6 and C3 filtering, and compares the voltage signal with the voltage provided at the current limiting protection point, that is, the connection node of resistors R7 and R8. When the motor works abnormally, the current limiting protection module 300 triggers a current limiting protection point, and the control module 100 limits the working current of the motor to a safe set value.
Further, the detection module 200 provides a second protection for the motor, the sampling resistor Rg collects the current flowing through the motor and converts the current into a voltage signal, the voltage signal is filtered by R2 and C2, the voltage signal is amplified in phase by the amplifier a and then sent to the judgment unit 210 for judgment, when the motor is abnormal, if an average comparison point is triggered, that is, the average value of the current flowing through the motor is greater than a preset safe average value and the duration is greater than a first preset duration, the judgment unit 210 judges that the motor is in an overcurrent state, and sends a stop signal to the control unit 110, and the control unit 110 controls the motor to stop working through the load adjustment unit 120, thereby protecting the motor and a driving circuit thereof.
Further, when the motor is abnormal, if the trigger instantaneous value comparison point is that the instantaneous value of the current flowing through the motor is greater than the preset safe instantaneous value and the duration time is greater than the second preset duration time, the determining unit 210 determines that the motor is in an overcurrent state, and sends a stop signal to the control unit 110, and the control unit 110 controls the motor to stop working through the load adjusting unit 120, so as to protect the motor and the driving circuit thereof.
A second aspect of the embodiments of the present application provides a motor driving device, including the overcurrent protection circuit provided in the first aspect of the embodiments of the present application, wherein the load is a motor.
A third aspect of the embodiments of the present application provides an electric apparatus including the motor drive apparatus provided by the second aspect of the embodiments of the present application, and a motor.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.
Claims (10)
1. The overcurrent protection circuit is characterized by comprising a control module and a detection module;
the detection module is respectively connected with the load and the control module and is used for detecting the current flowing through the load and sending a stop signal to the control module when the average value of the current flowing through the load is greater than a preset safe average value and lasts for a first preset time length or when the instantaneous value of the current flowing through the load is greater than a preset safe instantaneous value and lasts for a second preset time length;
the control module is respectively connected with a load and a power supply, and is used for connecting the power supply to the load and controlling the working state of the load; and the control module controls the load to stop working when receiving the stop signal.
2. The overcurrent protection circuit as set forth in claim 1, wherein said control module comprises a control unit and a load regulation unit, said control unit being connected to said power supply and said load regulation unit being connected to said control unit and said power supply and said load;
the control unit is used for controlling the load to stop working through the load adjusting unit when the stop signal is received;
the control unit is also used for sending a starting signal, a braking signal and a speed change signal to the load adjusting unit so as to respectively control the load to start, brake and change speed.
3. The overcurrent protection circuit as set forth in claim 1, wherein said detection module includes a current detection unit and a judgment unit;
the current detection unit is connected with the load and used for converting the current flowing through the load into a voltage signal and sending the voltage signal to the judgment unit;
the judging unit is connected with the control module and used for judging whether the average value of the current flowing through the load and the average value of the current flowing through the load are larger than a preset value and last for a preset time according to the voltage signal.
4. The overcurrent protection circuit as set forth in claim 3, wherein said current detection unit comprises a sampling resistor, a voltage dividing branch and a signal amplifying branch;
one end of the sampling resistor is connected with the load, the other end of the sampling resistor is grounded, and the sampling resistor is used for converting the current flowing through the load into the voltage signal;
one end of the voltage division branch is connected with one end of the sampling resistor, and the other end of the voltage division branch is grounded;
the signal amplification branch is connected with the sampling resistor and the voltage division branch and used for outputting the voltage signal to the judgment unit after in-phase amplification.
5. The overcurrent protection circuit as set forth in claim 4, wherein said signal amplification branch comprises an amplifier, a first filter resistor, a second filter resistor, a first filter capacitor, a second filter capacitor, a first clipping diode and a second clipping diode;
the first end of the first filter resistor is connected with the output end of the amplifier, the second end of the first filter resistor is connected with the first end of the first filter capacitor, the cathode of the first limiting diode and the anode of the second limiting diode together and connected to the judging unit, the second end of the first filter capacitor is grounded, the anode of the first limiting diode is grounded, and the cathode of the second limiting diode is connected with a voltage source;
the first end of the second filter resistor is connected with the voltage dividing branch, the second end of the second filter resistor is connected with the first end of the second filter capacitor and the non-inverting input end of the amplifier, and the second end of the second filter capacitor is grounded.
6. The overcurrent protection circuit as recited in claim 5, wherein said voltage dividing branch comprises a first voltage dividing resistor, a first terminal of said first voltage dividing resistor is connected to a first terminal of said second filter resistor and to said load, and a second terminal of said first voltage dividing resistor is connected to ground.
7. The overcurrent protection circuit of any one of claims 1 to 6, further comprising a current limiting protection module;
the current-limiting protection module is respectively connected with the load and the control module and is used for sending a current-limiting signal to the control module when detecting that the current flowing through the load is greater than a preset current-limiting value;
the control module is also used for limiting the output current of the load to be a set value when the current limiting signal is received.
8. The overcurrent protection circuit of claim 7, wherein said current limiting protection module comprises a comparator, a third filter resistor, a third filter capacitor and a second divider resistor;
one end of the second voltage-dividing resistor is connected with the load and is connected with one end of the third filter resistor, the other end of the second voltage-dividing resistor is grounded, the other end of the third filter resistor is connected with one end of the third filter capacitor and is connected with the comparator, and the other end of the third filter capacitor is grounded;
the comparator is also connected with a voltage stabilizing source and used for comparing the voltage of the voltage stabilizing source with the sampling voltage at one end of the second voltage dividing resistor.
9. A motor drive apparatus comprising the overcurrent protection circuit as set forth in any one of claims 1 to 8, wherein the load is a motor.
10. An electric apparatus, characterized by comprising the motor drive apparatus and the motor of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220747132.0U CN218771262U (en) | 2022-03-31 | 2022-03-31 | Overcurrent protection circuit, motor drive device and electrical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220747132.0U CN218771262U (en) | 2022-03-31 | 2022-03-31 | Overcurrent protection circuit, motor drive device and electrical device |
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| Publication Number | Publication Date |
|---|---|
| CN218771262U true CN218771262U (en) | 2023-03-28 |
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| CN202220747132.0U Active CN218771262U (en) | 2022-03-31 | 2022-03-31 | Overcurrent protection circuit, motor drive device and electrical device |
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- 2022-03-31 CN CN202220747132.0U patent/CN218771262U/en active Active
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