CN208707299U - The overcurrent protective device and electric system and equipment of motor - Google Patents
The overcurrent protective device and electric system and equipment of motor Download PDFInfo
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- CN208707299U CN208707299U CN201821622024.0U CN201821622024U CN208707299U CN 208707299 U CN208707299 U CN 208707299U CN 201821622024 U CN201821622024 U CN 201821622024U CN 208707299 U CN208707299 U CN 208707299U
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Abstract
The utility model discloses the overcurrent protective device of motor and electric system and equipment; wherein; overcurrent protective device includes motor drive module, current acquisition module, control switch and main control module, and motor drive module is for driving motor and stop signal is issued when receiving over-current signal；Current acquisition module includes the first test side, the second test side and output end, and the first test side is connected with motor drive module, and the second test side is connected to the motor, and current acquisition module is used to acquire the operating current of motor；Control switch is connected with motor drive module, for the disconnection when receiving stop signal, so that motor drive module stops the driving to motor；Main control module is used for the output overcurrent signal when the operating current of motor is greater than setting electric current threshold value.The device and electric system and equipment of the utility model, may be implemented the overcurrent protection to motor, avoid overcurrent that driving circuit is caused to damage.
Description
Technical field
The utility model belongs to motor control technology field more particularly to a kind of overcurrent protective device of motor, Yi Ji electricity
Machine system and equipment.
Background technique
Some type of motor such as PG motor has many advantages, such as that structure is simple, speed regulation may be implemented, is at low cost, answers extensively
Temperature protection is carried, but driving circuit does not have for the alternating current generator of the type for field of air conditioning or other fan class fields
There is overcurrent protection, when short circuit occurs for motor, it will driving element is burnt out, under scene of the air-conditioning using inflammable and explosive refrigerant,
Even cause fire.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.
For this purpose, a purpose of the utility model is to propose a kind of overcurrent protective device of motor, overcurrent protection dress
Overcurrent protection can be carried out to motor by setting, and element is avoided to burn.
Second purpose of the utility model is to propose a kind of electric system including the overcurrent protective device.
The third purpose of the utility model is to propose a kind of equipment using the electric system.
In order to achieve the above object, the overcurrent protective device of the motor of the utility model first aspect embodiment includes: electricity
Machine drive module issues stop signal for driving motor and when receiving over-current signal；Current acquisition module, the electric current
Acquisition module includes the first test side, the second test side and output end, wherein first test side and the motor driven mould
Block is connected, and second test side is connected to the motor, and the current acquisition module is used to acquire the operating current of the motor；
Control switch, the control switch are connected with the motor drive module, for the disconnection when receiving the stop signal, with
The motor drive module is set to stop the driving to the motor；Main control module, the main control module are adopted with the electric current respectively
The output end of collection module is connected with the motor drive module, is greater than setting electric current threshold value for the operating current in the motor
When export the over-current signal.
According to the overcurrent protective device of the motor of the utility model embodiment, the work of motor is acquired by current acquisition module
Make electric current, the output state of motor drive module is controlled by control switch, the overcurrent to motor driven part may be implemented
Protection, avoids burning element when overcurrent.
In some embodiments, the motor drive module includes vulnerabilities scan unit and forceful electric power output unit, wherein institute
It states vulnerabilities scan unit to be connected with the control switch and the main control module respectively, for when receiving the over-current signal
Stop signal is issued, the forceful electric power output unit is connected with the control switch and the motor respectively, for driving the electricity
Machine.
In some embodiments, the control switch includes vulnerabilities scan end and heavy-current control end, wherein the light current control
End processed is connected with the vulnerabilities scan unit, and the heavy-current control end is connected with the forceful electric power output unit, the control switch
For the disconnection when receiving the stop signal, so that the forceful electric power output unit stops output.
In some embodiments, the control switch is disconnecting switch, and safety can be improved.
In some embodiments, the vulnerabilities scan end includes the second control terminal of the first control terminal of light current and light current, wherein
Second control terminal of light current is connected with default power supply；The vulnerabilities scan unit includes first resistor, second resistance, third electricity
Resistance and first switch tube, wherein the first end of the first resistor is connected with the main control module, and the second of the first resistor
End is connected with the control terminal of the first end of the second resistance and the first switch tube respectively, the second end of the second resistance
It is connected respectively with the first end of the first switch tube and ground terminal, the second end of the first switch tube and the 3rd resistor
First end is connected, and the second end of the 3rd resistor is connected with first test side of light current.
In some embodiments, the heavy-current control end includes the second control terminal of the first control terminal of forceful electric power and forceful electric power, wherein
First control terminal of forceful electric power is connected with the firewire of motor；The forceful electric power output unit includes the 4th resistance, first capacitor and the
One inductance, wherein the first end of the 4th resistance is connected with the firewire of first control terminal of forceful electric power and the motor respectively,
The second end of 4th resistance is connected with the first end of the first capacitor, and second control terminal of forceful electric power is respectively with described
The second end of one capacitor is connected with the first end of first inductance；The second end of first inductance and the current acquisition mould
First test side of block is connected.
In some embodiments, the current acquisition module includes current sensor and acquisition unit, wherein the acquisition
Unit includes first diode, the 5th resistance, the 6th resistance and the 7th resistance, the first end of the current sensor and described the
The second end of one inductance is connected, and the second end of the current sensor is connected with the motor, the third of the current sensor
End is connected with the first end of the first end of the first diode and the 7th resistance respectively, and the 4th of the current sensor the
End is connected with the second end of the 7th resistance and ground terminal respectively, and the second end of the 7th resistance is connected with ground terminal, and described the
The second end of one diode is connected with the first end of the 5th resistance, the second end of the 5th resistance and the 6th resistance
First end be connected, the second end of the 6th resistance is connected with ground terminal, the second end of the 5th resistance and the described 6th electric
There is first node, the first node is used to acquire the operating current of the motor between the first end of resistance.
In some embodiments, the current acquisition module further includes voltage regulation unit and filter element, wherein the pressure stabilizing
Unit includes the first charging capacitor and the second diode, wherein the first end of first charging capacitor is connected with ground terminal, described
The second end of first charging capacitor is connected with the first end of second diode, the second end of second diode and default
Power supply is connected, and has second node, institute between the second end of first charging capacitor and the first end of second diode
Second node is stated to be connected with the first node；The filter element includes the 8th resistance and the second capacitor, wherein the described 8th
The first end of resistance is connected with the second node, the second end of the 8th resistance respectively with the main control module and described
The first end of two capacitors is connected, and the second end of second capacitor is connected with ground terminal.
In some embodiments, the current sensor includes Hall current sensor.
In order to achieve the above object, the electric system of the utility model second aspect embodiment, including motor and real above
Overcurrent protective device described in example is applied, the motor is connected with the overcurrent protective device.
It, can be with by using the overcurrent protective device of above example according to the electric system of the utility model embodiment
It realizes the overcurrent protection to motor, avoids overcurrent that driving circuit is caused to burn, improve reliability.
In order to achieve the above object, the equipment of the utility model third aspect embodiment, the motor including above example
System.
Motor may be implemented by using the electric system of above example according to the equipment of the utility model embodiment
The overcurrent protection of driving avoids over current of motor and causes fire particularly with the equipment using inflammable and explosive refrigerant.
Detailed description of the invention
Fig. 1 is the block diagram of the overcurrent protective device of the motor of one embodiment according to the present utility model；
Fig. 2 is the block diagram of the overcurrent protective device of the motor of another embodiment according to the present utility model；
Fig. 3 is the circuit diagram of the overcurrent protective device of the motor of one embodiment according to the present utility model；
Fig. 4 is the block diagram of the electric system of one embodiment according to the present utility model；
Fig. 5 is the block diagram of the equipment of one embodiment according to the present utility model.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
The overcurrent protective device of motor according to the utility model first aspect embodiment is described with reference to the accompanying drawings.
Fig. 1 is the block diagram of the overcurrent protective device of the motor of one embodiment according to the present utility model, as shown in Figure 1,
The overcurrent protective device 100 of the motor of the utility model embodiment includes motor drive module 10, current acquisition module 20, control
Switch 30 and main control module 40.
Wherein, motor drive module 10 issues for driving motor M and when receiving over-current signal stop signal；Electric current
Acquisition module 20 includes the first test side, the second test side and output end, wherein the first test side and motor drive module 10
It is connected, the second test side is connected with motor M, and current acquisition module is used to acquire the operating current of motor M；Control switch 30 and electricity
Machine drive module 10 is connected, for the disconnection when receiving stop signal, so that motor drive module 10 stops the drive to motor M
It is dynamic；Main control module 40 is connected with the output end of current acquisition module 20 and motor drive module 10 respectively, for the work in motor M
Output overcurrent signal when making electric current greater than current threshold, and then motor drive module 10 exports stop signal, control switch 30 is disconnected
It opens, motor drive module 10 stops driving motor M.Have the function that overcurrent protection, avoids burning element when short circuit.
According to the overcurrent protective device 100 of the motor of the utility model embodiment, electricity is acquired by current acquisition module 20
The operating current of machine is controlled the output state of motor drive module by the on-off of control switch 30, may be implemented to motor
Overcurrent protection, avoid burning element when overcurrent.
Further, in some embodiments, as shown in Fig. 2, motor drive module 10 includes 11 He of vulnerabilities scan unit
Forceful electric power output unit 12, wherein vulnerabilities scan unit 11 is connected with control switch 30 and main control module 40 respectively, for receiving
Stop signal is issued when to over-current signal, forceful electric power output unit 12 is connected with control switch 30 and motor M respectively, for driving electricity
Machine M.
In some embodiments, control switch 30 include vulnerabilities scan end and heavy-current control end, wherein vulnerabilities scan end with
Vulnerabilities scan unit 11 is connected, and heavy-current control end is connected with forceful electric power output unit 12, and control switch 30 is used to receive stopping
It is disconnected when signal, so that forceful electric power output unit 12 stops output.
Specifically, under normal circumstances, control switch 30 is closed, and forceful electric power output unit 12 controls forceful electric power and exports to motor M, electricity
Machine M is operated normally, and current acquisition module 20 detects the operating current of motor M, and main control module 40 is monitored the operating current,
In the driving short circuit of overcurrent such as motor M, operating current is greater than setting electric current threshold value, and 40 output overcurrent signal of main control module is extremely
Vulnerabilities scan unit 11, vulnerabilities scan unit detect that over-current signal exports stop signal to control switch 30, control switch 30
Stop signal disconnection is received, then cuts off the connection of forceful electric power output unit 12 Yu motor M, motor M is out of service, reaches overcurrent guarantor
The purpose of shield.
In embodiment, control switch 30 can be disconnecting switch, for example including light-operated bidirectional triode thyristor or solid-state relay
Device can also be constituted using discrete device and optocoupler, can be defeated by vulnerabilities scan unit 11 and forceful electric power by setting disconnecting switch
Unit 12 is isolated out, safer.
Modules are further illustrated in embodiment referring to Fig. 3.
It is the circuit diagram of the overcurrent protective device of the motor of one embodiment according to the present utility model, such as Fig. 3 described in Fig. 3
Shown, the vulnerabilities scan end of control switch 30 includes the second control terminal of the first control terminal of light current and light current, wherein light current second is controlled
End processed is connected with default power supply.For example, in Fig. 3 control switch 30 pin 2 and pin 3, be vulnerabilities scan end, pin 2 with
Default power supply connection, pin 3 be connected with vulnerabilities scan unit 11, to when detecting overcurrent the output of vulnerabilities scan unit 11 stop
Stop signal.
As shown in figure 3, vulnerabilities scan unit 11 is opened including first resistor R1, second resistance R2,3rd resistor R3 and first
Close pipe Q1, wherein the first end of first resistor R1 is connected with main control module 40, and the second end of first resistor R1 is electric with second respectively
The first end of resistance R2 is connected with the control terminal of first switch tube Q1, and the second end of second resistance R2 is respectively with first switch tube Q1's
First end is connected with ground terminal, and the second end of first switch tube Q1 is connected with the first end of 3rd resistor R3, and the of 3rd resistor R3
Two ends are connected with the first test side of light current such as pin 3.
Specifically, stop signal is generated when vulnerabilities scan unit 11 receives the over-current signal of main control module 40, and will be stopped
Stop signal is transmitted to the pin 3 of control switch 30, and control switch 30 disconnects, and exports forceful electric power to electricity to cut off forceful electric power output unit 12
Machine M, motor M is out of service, realizes overcurrent protection.
In some embodiments, the heavy-current control end of control switch 30 includes that the first control terminal of forceful electric power and forceful electric power second control
End, for example, in Fig. 3 control switch 30 pin 6 and pin 8, wherein the fire of the first control terminal of forceful electric power such as pin 8 and motor
Line is connected.
Forceful electric power output unit 12 includes the 4th resistance R4, first capacitor C1 and the first inductance L1, wherein the 4th resistance R4's
First end is connected with the first control terminal of forceful electric power such as firewire of pin 8 and motor M respectively, the second end and first of the 4th resistance R4
The first end of capacitor C1 is connected, the second control terminal of forceful electric power first end with the second end of first capacitor C1 and the first inductance L1 respectively
It is connected；The second end of first inductance L1 is connected with the first test side of current acquisition module 20.
Wherein, the pin 6 and pin 8 of control switch 30 constitute forceful electric power switch unit, the 4th resistance R4 and first capacitor C1
Filter circuit in series.When the stop signal that vulnerabilities scan unit 11 transmits when detecting overcurrent of control switch 30, pin 6
The switch being similar in optocoupler is disconnected with pin 8 to disconnect, and cuts off forceful electric power and exports to motor M, motor M and stop, and realizes that excess temperature is protected
Shield.
As shown in figure 3, in embodiment, current acquisition module 20 includes current sensor 21 and acquisition unit 22, wherein
Acquisition unit 22 includes first diode D1, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R6, and the of current sensor 21
One end is connected with the second end of the first inductance L1, and the second end of current sensor 21 is connected with motor M, and the of current sensor 21
Three ends are connected with the first end of the first end of first diode D1 and the 7th resistance R7 respectively, the 4th end point of current sensor 21
It is not connected with the second end of the 7th resistance R7 and ground terminal, the second end of the 7th resistance R7 is connected with ground terminal, first diode D1's
Second end is connected with the first end of the 5th resistance R5, and the second end of the 5th resistance R5 is connected with the first end of the 6th resistance R6, the
The second end of six resistance R6 is connected with ground terminal, has first between the second end of the 5th resistance R5 and the first end of the 6th resistance R6
Node O1, first node O1 are used to acquire the operating current of motor M.Wherein, the electricity of the operating current of motor M and the 7th resistance R7
Pressure value is directly proportional, and the 5th resistance R5 and the 6th resistance R6 are divided, and the work electricity of reflection motor is acquired by first node O1
The voltage value of stream.
In some embodiments, current sampling module 20 can include suddenly using isolation sample circuit, current sensor 21
That current sensor, Hall current sensor can be connected on the forceful electric power output circuit of motor drive module 10, to driving
The electric current of circuit is monitored, wherein the current threshold of setting can store in main control module 40, the overcurrent protection of setting
Current threshold can realize the mistake to circuit drives circuit between protective tube current flow ratings and motor M locked rotor current value
Stream protection.
Further, in some embodiments, current sampling module 20 further includes voltage regulation unit 23 and filter element 24,
In, voltage regulation unit 23 filters interference letter for the filtering to sampled voltage for the pressure stabilizing to sample voltage value, filter element 24
Number.
As shown in figure 3, voltage regulation unit 23 includes the first charging capacitor E1 and the second diode D2, wherein the first charging electricity
The first end for holding E1 is connected with ground terminal, and the second end of the first charging capacitor E1 is connected with the first end of the second diode D2, and second
The second end of diode D2 is connected with default power supply, the first end of the second end of the first charging capacitor E1 and the second diode D2 it
Between have second node O2, second node O2 is connected with first node O1, to obtain voltage sample value.Filter element 24 includes the
Eight resistance R8 and the second capacitor C2, wherein the first end of the 8th resistance R8 is connected with second node O2, and the second of the 8th resistance R8
End is connected with the first end of main control module 40 and the second capacitor C2 respectively, and the second end of the second capacitor C2 is connected with ground terminal.
Specifically, the operating current of Hall current sensor acquisition motor M, and by the sampled signal of the operating current of acquisition
It is transmitted to main control module 40 after carrying out pressure stabilizing and filtering, main control module 40 is when operating current is more than the overcurrent threshold value of setting
Over-current signal is issued, vulnerabilities scan unit 11 detects that over-current signal generates stop signal, and the heavy-current control of control switch 30 is opened
Shutdown is opened, and cutting forceful electric power output unit 12 exports forceful electric power to motor M, and motor M is out of service, realizes overcurrent protection, avoids overcurrent
Burn driving element.
In short, the overcurrent protective device 100 of the motor of the utility model embodiment, when detecting motor M overcurrent,
It cuts off and the forceful electric power of motor M is exported, prevent driving element from burning, avoid that fire occurs.The overcurrent of the utility model embodiment is protected
Protection unit 100, can especially when air-conditioning is using being the refrigerant easily fired suitable for the air-conditioning or other equipment for using motor
To guarantee the reliability of the driving circuit of motor M, unexpected generation is prevented.
The overcurrent protective device of motor based on above example is described with reference to the accompanying drawings according to the utility model second
The electric system of aspect embodiment.
Fig. 4 is the block diagram of the electric system of one embodiment according to the present utility model, as shown in figure 4, the utility model
Electric system 1000 including motor M and above example overcurrent protective device 100, wherein motor M such as PG motor and mistake
It flows protective device 100 to be connected, the structure of overcurrent protective device 100 is referred to the description of above example.
According to the electric system 1000 of the utility model embodiment, by using the overcurrent protective device of above example
100, it may be implemented to avoid overcurrent that driving circuit is caused to burn the overcurrent protection of motor M, improve reliability.
Equipment according to the utility model third aspect embodiment is described with reference to the accompanying drawings.
Fig. 5 is according to the block diagram of the equipment of the utility model embodiment, as shown in figure 5, the utility model embodiment is set
Standby 2000 include the electric system 1000 of above example, such as equipment 2000 may include air-conditioning, and air-conditioning uses PG department of electrical engineering
System, the realization of the overcurrent protection of electric system 1000 are referred to the explanation of above example.
It, can be with by using the electric system 1000 of above example according to the equipment 2000 of the utility model embodiment
It realizes motor driven overcurrent protection, particularly with the equipment using inflammable and explosive refrigerant, overcurrent is avoided to cause fire.
It should be noted that in the description of this specification, reference term " one embodiment ", " is shown " some embodiments "
The description of example ", " specific example " or " some examples " etc. mean specific features described in conjunction with this embodiment or example, structure,
Material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned term
Schematic representation be necessarily directed to identical embodiment or example.Moreover, description specific features, structure, material or
Person's feature may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, in not conflicting feelings
Under condition, those skilled in the art by different embodiments or examples described in this specification and different embodiment or can show
The feature of example is combined.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.The meaning of " plurality " is at least two, such as two in the description of the present invention,
It is a, three etc., unless otherwise specifically defined.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (10)
1. a kind of overcurrent protective device of motor, which is characterized in that the overcurrent protective device includes:
Motor drive module issues stop signal for driving motor and when receiving over-current signal；
Current acquisition module, the current acquisition module include the first test side, the second test side and output end, wherein described
First test side is connected with the motor drive module, and second test side is connected to the motor, the current acquisition module
For acquiring the operating current of the motor；
Control switch, the control switch are connected with the motor drive module, for breaking when receiving the stop signal
It opens, so that the motor drive module stops the driving to the motor；
Main control module, the main control module respectively with the output end of the current acquisition module and the motor drive module phase
Even, the over-current signal is exported when being greater than setting electric current threshold value for the operating current in the motor.
2. the overcurrent protective device of motor according to claim 1, which is characterized in that the motor drive module includes weak
Electric control unit and forceful electric power output unit, wherein the vulnerabilities scan unit respectively with the control switch and the master control mould
Block is connected, for issuing stop signal when receiving the over-current signal, the forceful electric power output unit respectively with the control
Switch is connected with the motor, for driving the motor.
3. the overcurrent protective device of motor according to claim 2, which is characterized in that the control switch includes light current control
End processed and heavy-current control end, wherein the vulnerabilities scan end is connected with the vulnerabilities scan unit, the heavy-current control end and institute
It states forceful electric power output unit to be connected, the control switch is used for the disconnection when receiving the stop signal, so that the forceful electric power
Output unit stops output.
4. the overcurrent protective device of motor according to claim 3, which is characterized in that the control switch is to keep apart
It closes.
5. the overcurrent protective device of motor according to claim 3 or 4, which is characterized in that
The vulnerabilities scan end includes the second control terminal of the first control terminal of light current and light current, wherein second control terminal of light current
It is connected with default power supply；
The vulnerabilities scan unit includes first resistor, second resistance, 3rd resistor and first switch tube, wherein described first
The first end of resistance is connected with the main control module, the second end of the first resistor first end with the second resistance respectively
It is connected with the control terminal of the first switch tube, the second end of the second resistance first end with the first switch tube respectively
It is connected with ground terminal, the second end of the first switch tube is connected with the first end of the 3rd resistor, and the of the 3rd resistor
Two ends are connected with first test side of light current.
6. the overcurrent protective device of motor according to claim 3 or 4, which is characterized in that
The heavy-current control end includes the second control terminal of the first control terminal of forceful electric power and forceful electric power, wherein first control terminal of forceful electric power
It is connected with the firewire of motor；
The forceful electric power output unit includes the 4th resistance, first capacitor and the first inductance, wherein the first end of the 4th resistance
It is connected respectively with the firewire of first control terminal of forceful electric power and the motor, the second end of the 4th resistance and first electricity
The first end of appearance is connected, second control terminal of forceful electric power respectively with the second end of the first capacitor and first inductance the
One end is connected；The second end of first inductance is connected with the first test side of the current acquisition module.
7. the overcurrent protective device of motor according to claim 6, which is characterized in that the current acquisition module includes electricity
Flow sensor and acquisition unit, wherein the acquisition unit includes first diode, the 5th resistance, the 6th resistance and the 7th electricity
Resistance, the first end of the current sensor is connected with the second end of first inductance, the second end of the current sensor and
The motor be connected, the third end of the current sensor respectively with the first end of the first diode and the 7th resistance
First end be connected, the 4th end of the current sensor is connected with the second end of the 7th resistance and ground terminal respectively, described
The second end of 7th resistance is connected with ground terminal, and the second end of the first diode is connected with the first end of the 5th resistance,
The second end of 5th resistance is connected with the first end of the 6th resistance, the second end and ground terminal phase of the 6th resistance
Even, there is first node, the first node is used between the second end of the 5th resistance and the first end of the 6th resistance
In the operating current for acquiring the motor.
8. the overcurrent protective device of motor according to claim 7, which is characterized in that the current acquisition module further includes
Voltage regulation unit and filter element, wherein
The voltage regulation unit include the first charging capacitor and the second diode, wherein the first end of first charging capacitor with
Ground terminal is connected, and the second end of first charging capacitor is connected with the first end of second diode, second diode
Second end be connected with default power supply, have between the second end of first charging capacitor and the first end of second diode
There is second node, the second node is connected with the first node；
The filter element includes the 8th resistance and the second capacitor, wherein the first end of the 8th resistance and second section
Point is connected, and the second end of the 8th resistance is connected with the first end of the main control module and second capacitor respectively, described
The second end of second capacitor is connected with ground terminal.
9. a kind of electric system, which is characterized in that including motor and such as the described in any item overcurrent protection dresses of claim 1-8
It sets, the motor is connected with the overcurrent protective device.
10. a kind of equipment, which is characterized in that the equipment includes electric system as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821622024.0U CN208707299U (en) | 2018-09-30 | 2018-09-30 | The overcurrent protective device and electric system and equipment of motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821622024.0U CN208707299U (en) | 2018-09-30 | 2018-09-30 | The overcurrent protective device and electric system and equipment of motor |
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| CN208707299U true CN208707299U (en) | 2019-04-05 |
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| CN201821622024.0U Active CN208707299U (en) | 2018-09-30 | 2018-09-30 | The overcurrent protective device and electric system and equipment of motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110690685A (en) * | 2019-09-06 | 2020-01-14 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN111740381A (en) * | 2020-07-10 | 2020-10-02 | 广东美芝制冷设备有限公司 | Switching power supply circuit, air conditioning equipment and refrigerator |
-
2018
- 2018-09-30 CN CN201821622024.0U patent/CN208707299U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110690685A (en) * | 2019-09-06 | 2020-01-14 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN110690685B (en) * | 2019-09-06 | 2020-11-24 | 珠海格力电器股份有限公司 | High-precision overcurrent protection circuit and method and motor |
| CN111740381A (en) * | 2020-07-10 | 2020-10-02 | 广东美芝制冷设备有限公司 | Switching power supply circuit, air conditioning equipment and refrigerator |
| CN111740381B (en) * | 2020-07-10 | 2022-08-19 | 广东美芝制冷设备有限公司 | Switching power supply circuit, air conditioning equipment and refrigerator |
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