CN110556787A - motor protection circuit and protection control method - Google Patents
motor protection circuit and protection control method Download PDFInfo
- Publication number
- CN110556787A CN110556787A CN201810565933.3A CN201810565933A CN110556787A CN 110556787 A CN110556787 A CN 110556787A CN 201810565933 A CN201810565933 A CN 201810565933A CN 110556787 A CN110556787 A CN 110556787A
- Authority
- CN
- China
- Prior art keywords
- circuit
- motor
- signal
- sampling
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 80
- 238000010586 diagram Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
Abstract
The invention discloses a motor protection circuit and a protection control method, wherein the motor protection circuit comprises a main control module, a power supply circuit and a motor drive circuit, the main control module generates a control signal and sends the control signal to the motor drive circuit, the motor drive circuit receives the control of the main control module, generates a drive signal and inputs the drive signal to a motor, the drive signal output end of the motor drive circuit is connected with a sampling circuit, the sampling circuit feeds back the sampling signal to the motor drive circuit or the main control module, the main control module generates a power supply control signal to the power supply circuit according to the output condition of the control signal and the sampling signal, and the power supply circuit receives the control of the main control module and inputs power supply voltage to the motor drive circuit or cuts off the input of the power. The motor protection circuit can judge whether the motor driving circuit has faults or not, and can control the power supply voltage of the motor driving circuit to be disconnected when the faults are judged, so that the motor and the driving circuit are protected from the source.
Description
Technical Field
The invention relates to a protection circuit, in particular to a motor protection circuit and a protection control method.
Background
At present, the washing machine is divided into a wave wheel type and a rotary drum type, and the rotation of the inner drum of the washing machine is driven by a motor. The motor is bad, and the maintenance cost is high, and the motor occupies a certain proportion in the bad after-sale of the washing machine. There are many reasons for motor failure, among which there are situations where the drive circuit on the drive plate fails, resulting in motor damage. The motor needs current drive when working, the current values that different motors can bear are different, and the motor can be damaged when the current value exceeds the tolerance value of the motor for a certain time. The existing protection scheme for the motor only has hardware overcurrent protection, and when the current value exceeds the overcurrent value set by the hardware, the hardware within 2us stops current output by switching off 6 paths of IGBTs so as to protect the motor and a driving circuit. When a motor driving circuit is damaged, for example, an IGBT is damaged, a current cannot be completely cut off by simply passing through 6 waveforms, and the motor still has the possibility of being damaged, so that the motor and the driving circuit cannot be completely protected in the prior art.
disclosure of Invention
the invention provides a motor protection circuit, which aims to solve the technical problem that a motor is damaged due to the fact that a driving circuit fault cannot be detected in the prior art, and can be used for solving the problem.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a motor protection circuit, includes host system, power supply circuit and motor drive circuit, motor drive circuit accepts host system's control produces drive signal and inputs to the motor, motor drive circuit's drive signal output is connected with sampling circuit, sampling circuit feeds back sampling signal extremely motor drive circuit or host system, host system generates power control signal extremely according to control signal output situation and sampling signal power supply circuit, power supply circuit accepts host system's control to motor drive circuit input supply voltage or disconnection to motor drive circuit input supply voltage.
furthermore, the input end of the power circuit is connected with a mains supply through a socket, the output end of the power circuit outputs power supply voltage to the motor driving circuit, a fusing resistor is connected in series in a power supply voltage output path of the power circuit, two ends of the fusing resistor are connected in parallel with control switches, and the control switches receive the control switching on-off state of the main control module.
Furthermore, the power circuit comprises a first filter circuit and a rectifier circuit, the input end of the first filter circuit is connected with the socket, the output end of the first filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit outputs power supply voltage to the motor drive circuit, and the fusing resistor is connected between the first filter circuit and the rectifier circuit.
Furthermore, the control switch is a relay, the normally open contact of the relay is connected in parallel with two ends of the fusing resistor, and the control signal input end of the relay is connected with one of the control signal output ends of the main control module.
Furthermore, the motor driving circuit generates three driving signals and inputs the three driving signals to the motor, the sampling circuit comprises three sampling resistors, the three sampling resistors are connected between the three driving signal output ends and the ground in a one-to-one correspondence manner, and the sampling circuit feeds current sampling signals acquired by the three sampling resistors back to the motor driving circuit.
further, the sampling circuit further comprises a second filter circuit, and the second filter circuit is connected in parallel with the sampling resistor.
furthermore, an operational amplifier circuit is connected between the output end of the sampling circuit and the motor driving circuit.
The invention also provides a motor protection control method, which comprises the following steps:
The main control module generates a control signal and sends the control signal to the motor driving circuit, and the control signal is used for controlling the motor driving circuit to send a driving signal to the motor;
The motor driving circuit is controlled by the main control module and is used for generating a driving signal and sending the driving signal to the motor,
The sampling circuit samples a driving signal output end of the motor driving circuit and feeds a sampling signal back to the motor driving circuit or the main control module;
The power supply circuit is used for receiving the control of the main control module to switch on or switch off the input of power supply voltage to the motor driving circuit;
when the main control module does not detect that the control signal is output and the sampling signal exceeds a preset threshold value, the main control module generates a power control signal to the power circuit, and the power circuit receives the control disconnection of the main control module and inputs power supply voltage to the motor driving circuit.
Further, when the sampling circuit feeds back the sampling signal to the motor driving circuit, the motor driving circuit compares and judges the sampling signal, generates a comparison signal and sends the comparison signal to the main control module, and the main control module generates a power supply control signal according to whether the control signal is output and the comparison signal.
furthermore, the input end of the power circuit is connected with a mains supply through a socket, the output end outputs a power supply voltage to the motor driving circuit, a fusing resistor is connected in series in a power supply voltage output path of the power circuit, two ends of the fusing resistor are connected with control switches in parallel, the on-off state of the control switches is controlled by the power supply control signal, when the control switches are disconnected, current flows through the fusing resistor, the current exceeds the rated power of the fusing resistor, then the fusing resistor is burned out, and the power supply voltage entering the motor driving circuit is cut off.
compared with the prior art, the invention has the advantages and positive effects that: the motor protection circuit can judge whether the motor driving circuit has faults or not, can control the power supply voltage of the motor driving circuit to be disconnected when the faults are judged, protects the motor and the driving circuit from the source, meets the safety requirements better, avoids the damage to the motor caused by the faults of the motor driving circuit, and further can avoid the occurrence of the conditions of fire and the like caused by continuous power supply in the shutdown state of the motor.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of an embodiment of a motor protection circuit according to the present invention;
FIG. 2 is a power circuit diagram of an embodiment of the motor protection circuit of the present invention;
FIG. 3 is a pin diagram of a motor driving circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a sampling circuit of an embodiment of the proposed motor protection circuit;
Fig. 5 is an operational amplifier circuit diagram of an embodiment of the motor protection circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
the embodiment one, this embodiment provides a motor protection circuit, as shown in fig. 1, including a main control module, a power supply circuit and a motor drive circuit, the main control module generates a control signal and sends to the motor drive circuit, the motor drive circuit accepts the control of the main control module, generates a drive signal and inputs the drive signal to a motor, a drive signal output end of the motor drive circuit is connected with a sampling circuit, the sampling circuit samples the drive signal, and feeds the sampling signal back to the motor drive circuit or the main control module, the main control module generates a power supply control signal to the power supply circuit according to a control signal output condition and the sampling signal, the power supply circuit accepts the control of the main control module to the motor drive circuit inputs a supply voltage or disconnects the motor drive circuit inputs a supply voltage. The protection principle of the motor protection circuit is as follows: the main control module can obtain the state of a driving signal applied to the motor through a sampling signal obtained by a sampling circuit on one hand, and can monitor the condition of a control signal sent by the main control module on the other hand, when the control signal controls the motor to stop and detects that the sampling signal exceeds a set threshold value, the motor driving circuit breaks down, the motor driving circuit is protected from being damaged by adopting a mode of disconnecting the motor driving circuit from the power supply voltage input by the motor driving circuit, and only a power supply circuit needs to be maintained or replaced when the motor driving circuit is maintained, so that the maintenance cost can be reduced.
As shown in fig. 2, the input end of the power circuit is connected to the mains supply through a socket CN1, the output end outputs the supply voltage VBus to the motor driving circuit, a fuse resistor R3 is connected in series in the supply voltage output path of the power circuit, two ends of the fuse resistor R3 are connected in parallel with a control switch K1, and the control switch K1 is controlled by the main control module to switch the on-off state. The protection principle of the power supply circuit of the embodiment is as follows: control switch K1 is normally open switch, when putting through socket CN1 and commercial power, the commercial power is behind power supply circuit's processing circuit, fusing resistance R3 flows through, and change output supply voltage VBus, supply voltage VBus can be for the power supply of host system, host system is last to send control signal to control switch K1, control switch is closed, short circuit fusing resistance R3, therefore, the converting output supply voltage VBus that power supply circuit can last, for the power supply of rear end load. The time that current flows through the fuse resistor R3 is short, so the fuse resistor R3 cannot fuse, when the control signal is detected to control the motor to stop and the sampling signal is detected to exceed a set threshold value, the motor driving circuit is indicated to break down, the main control module sends a control signal to the control switch K1 at the moment, the control switch is disconnected, the mains supply flows through the fuse resistor R3 after passing through a processing circuit of the power circuit and is converted to output the power supply voltage VBus, the fuse resistor R3 is blown out after exceeding the rated power of the fuse resistor, the power supply voltage output of the power circuit is cut off, the voltage entering the motor driving circuit is cut off, and the purpose of protecting the motor driving circuit and the motor from damage or secondary damage is achieved.
As a preferred embodiment, as shown in fig. 2, the power supply circuit includes a first filter circuit and a rectifier circuit, the input end of the first filter circuit is connected to the socket, the output end of the first filter circuit is connected to the input end of the rectifier circuit, the output end of the rectifier circuit outputs the supply voltage to the motor drive circuit, and the fuse resistor is connected between the first filter circuit and the rectifier circuit. The first filter circuit is used for filtering out interference signals in the commercial power, the filter circuit can be realized by adopting electric elements such as a capacitor CX1 and an inductor L1 in fig. 2, filtered current signals are transmitted to the rectifier circuit through the control switch K1, and the rectifier circuit is used for rectifying alternating current signals into direct current signals to be output. The rectifying circuit in this embodiment may be implemented using a rectifying bridge circuit DB1 as shown in fig. 2.
in this embodiment, the control switch K1 may be implemented by a relay, the normally open contacts 3 and 4 of the relay are connected in parallel at two ends of the fuse resistor R3, the control signal input end RS of the relay is connected with one of the control signal output ends of the main control module, and the on-state of the normally open contact is controlled by the main control module.
As shown in fig. 3, the motor driving circuit generates three driving signals (MTR _ CURRENT _ U, MTR _ CURRENT _ V, MTR _ CURRENT _ W, respectively) and inputs the signals to the motor, the sampling circuit includes three sampling resistors R153, R154, and R155, the three sampling resistors R153, R154, and R155 are connected between the three driving signal output terminals and the ground in a one-to-one correspondence manner, and the sampling circuit feeds the CURRENT sampling signals acquired by the three sampling resistors back to the motor driving circuit.
As shown in fig. 3, the motor driving circuit in this embodiment is implemented by using a chip IC 6.
As shown in fig. 4, the sampling circuit further includes current-limiting resistors R241, R242, and R243 respectively connected to the three-way driving signal output terminals, and diodes D241, D242, and D243 which are unidirectionally turned on are respectively connected to rear ends of the three current-limiting resistors.
preferably, the sampling circuit further includes a second filter circuit for filtering out an interference signal in the sampling signal, and the second filter circuit is connected in parallel with the sampling resistor. As shown in fig. 4, the second filter circuit in this embodiment includes a resistor R244 and a capacitor C241 connected in parallel.
as shown in fig. 3, when the main control module controls the motor to normally stop, the main control module sends control signals CPWMUH, CPWMUL, CPWMVH, CPWMVL, CPWMWH, and CPWMWL to the motor driving circuit IC6, and 6 waveforms in total shut off 6 IGBTs (insulated gate bipolar transistors) in the IC6, so as to normally shut off the current output of the motor driving circuit, and if the motor driving circuit is in a normal state, the sampling circuit should not detect that a driving signal is output to the motor.
The sampling signal ITRIP can be sent to the motor driving circuit, also can directly send to the host control module, carry out comparison and judgment by the host control module, sampling circuit sends sampling signal ITRIP to the 15 th terminal of motor driving circuit IC6 in this embodiment, the comparison and judgment of sampling signal is accomplished by motor driving circuit IC6, the 14 th terminal of motor driving circuit IC6 is connected with the host control module, 14 th terminal output low level of IC6 reaches the host control module when the voltage value is greater than the settlement threshold value, whether control motor shut down by the host control module combination is present, and confirm whether send power control signal to power supply circuit thereby the disconnection to motor driving circuit input supply voltage.
An operational amplifier circuit is further connected between the output end of the sampling circuit and the motor driving circuit, and is used for amplifying the sampling signal, as shown in fig. 5, taking one path of signal as an example, the signals MTR _ CURRENT _ V and MTR _ ISENSE _ V sampled from the sampling resistor R154 enter an operational amplifier device IC7 with two-path operational amplifier in a differential wiring manner, for example, the two sampling signals are amplified by N times by adding and subtracting the operational amplifier circuit, and simultaneously, one level is superimposed, and finally, the two sampling signals enter a control chip for processing. Of course, the operational amplifier circuit in this patent is not limited to the above example.
In a second embodiment, the present invention provides a motor protection control method, including the following steps:
The main control module generates a control signal and sends the control signal to the motor driving circuit, and the control signal is used for controlling the motor driving circuit to send a driving signal to the motor;
the motor driving circuit is controlled by the main control module and is used for generating a driving signal and sending the driving signal to the motor,
The sampling circuit samples a driving signal output end of the motor driving circuit and feeds a sampling signal back to the motor driving circuit or the main control module;
The power supply circuit is used for receiving the control of the main control module to switch on or switch off the input of power supply voltage to the motor driving circuit;
when the main control module does not detect that the control signal is output and the sampling signal exceeds the preset threshold value, the main control module generates a power supply control signal to the power supply circuit, and the power supply circuit receives the control disconnection of the main control module and inputs power supply voltage to the motor driving circuit.
the motor protection control method of the embodiment can judge whether the motor driving circuit has faults or not, can control the power supply voltage of the motor driving circuit to be disconnected when the faults are judged, protects the motor and the driving circuit from the source, better meets the safety requirements, avoids the damage to the motor caused by the faults of the motor driving circuit, and further can avoid the situations of fire and the like caused by continuous power supply under the shutdown state of the motor.
the protection circuit adopted in the motor protection control method of this embodiment may be referred to in the first embodiment, and is not described herein again.
The sampling signal can be sent to the motor driving circuit, also can directly send to the main control module, is compared and judged by the main control module, and the sampling circuit sends the sampling signal to the motor driving circuit in this embodiment and compares and judges.
When the sampling circuit feeds back the sampling signal to the motor driving circuit, the motor driving circuit compares and judges the sampling signal, generates a comparison signal and sends the comparison signal to the main control module, and the main control module generates a power supply control signal according to whether the control signal is output and the comparison signal.
The input end of the power circuit is connected with a mains supply through a socket, the output end of the power circuit outputs a power supply voltage to the motor driving circuit, a fusing resistor is connected in series in a power supply voltage output path of the power circuit, two ends of the fusing resistor are connected with a control switch in parallel, the on-off state of the control switch is controlled by a power supply control signal, when the control switch is switched off, current flows through the fusing resistor, the current is blown out after the rated power of the fusing resistor is exceeded, and the power supply voltage entering the motor driving circuit is cut off.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a motor protection circuit, includes host system, power supply circuit and motor drive circuit, its characterized in that, host system produces control signal and sends to motor drive circuit, motor drive circuit accepts host system's control produces drive signal and inputs to the motor, motor drive circuit's drive signal output is connected with sampling circuit, sampling circuit feeds back sampling signal extremely motor drive circuit or host system, host system generates power control signal extremely according to control signal output situation and sampling signal power supply circuit, power supply circuit accepts host system's control to motor drive circuit input supply voltage or disconnection to motor drive circuit input supply voltage.
2. The motor protection circuit according to claim 1, wherein an input end of the power circuit is connected to a mains supply through a socket, an output end of the power circuit outputs a supply voltage to the motor driving circuit, a fusing resistor is connected in series in a supply voltage output path of the power circuit, two ends of the fusing resistor are connected in parallel with a control switch, and the control switch receives control of the main control module to switch an on-off state.
3. The motor protection circuit according to claim 2, wherein the power supply circuit includes a first filter circuit and a rectifier circuit, an input terminal of the first filter circuit is connected to a socket, an output terminal of the first filter circuit is connected to an input terminal of the rectifier circuit, an output terminal of the rectifier circuit outputs a supply voltage to the motor drive circuit, and a fuse resistor is connected between the first filter circuit and the rectifier circuit.
4. The motor protection circuit according to claim 2, wherein the control switch is a relay, a normally open contact of the relay is connected in parallel to two ends of the fusing resistor, and a control signal input end of the relay is connected with one of the control signal output ends of the main control module.
5. The motor protection circuit of claim 1, wherein the motor driving circuit generates three driving signals and inputs the three driving signals to the motor, the sampling circuit comprises three sampling resistors, the three sampling resistors are connected between the three driving signal output terminals and the ground in a one-to-one correspondence, and the sampling circuit feeds back current sampling signals obtained by the three sampling resistors to the motor driving circuit.
6. The motor protection circuit of claim 5 wherein the sampling circuit further comprises a second filter circuit connected in parallel with the sampling resistor.
7. The motor protection circuit according to any one of claims 1-6, wherein an operational amplifier circuit is further connected between the output end of the sampling circuit and the motor driving circuit.
8. A motor protection control method is characterized by comprising the following steps:
The main control module generates a control signal and sends the control signal to the motor driving circuit, and the control signal is used for controlling the motor driving circuit to send a driving signal to the motor;
the motor driving circuit is controlled by the main control module and is used for generating a driving signal and sending the driving signal to the motor,
The sampling circuit samples a driving signal output end of the motor driving circuit and feeds a sampling signal back to the motor driving circuit or the main control module;
the power supply circuit is used for receiving the control of the main control module to switch on or switch off the input of power supply voltage to the motor driving circuit;
When the main control module does not detect that the control signal is output and the sampling signal exceeds a preset threshold value, the main control module generates a power control signal to the power circuit, and the power circuit receives the control disconnection of the main control module and inputs power supply voltage to the motor driving circuit.
9. The motor protection control method according to claim 8, wherein when the sampling circuit feeds back the sampling signal to the motor driving circuit, the motor driving circuit compares and judges the sampling signal, generates a comparison signal and sends the comparison signal to the main control module, and the main control module generates a power control signal according to whether a control signal is output and the comparison signal.
10. The motor protection control method according to claim 8, wherein an input end of the power circuit is connected to a commercial power through a socket, an output end of the power circuit outputs a supply voltage to the motor drive circuit, a fusing resistor is connected in series in a supply voltage output path of the power circuit, two ends of the fusing resistor are connected in parallel with a control switch, an on-off state of the control switch is controlled by the power control signal, when the control switch is turned off, a current flows through the fusing resistor, the fusing resistor is blown out after the rated power of the fusing resistor is exceeded, and the supply voltage entering the motor drive circuit is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565933.3A CN110556787A (en) | 2018-06-04 | 2018-06-04 | motor protection circuit and protection control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565933.3A CN110556787A (en) | 2018-06-04 | 2018-06-04 | motor protection circuit and protection control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110556787A true CN110556787A (en) | 2019-12-10 |
Family
ID=68736089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810565933.3A Pending CN110556787A (en) | 2018-06-04 | 2018-06-04 | motor protection circuit and protection control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110556787A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083221A (en) * | 2020-10-15 | 2020-12-15 | 珠海格力电器股份有限公司 | Fault detection method and device and electrical equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769120A (en) * | 2004-09-07 | 2006-05-10 | 三菱电机株式会社 | Electric power steering controller |
| CN106640691A (en) * | 2016-12-13 | 2017-05-10 | 杭州信多达电器有限公司 | Device and method for water pump fault testing and protecting |
| CN208226558U (en) * | 2018-06-04 | 2018-12-11 | 青岛海尔智能电子有限公司 | A kind of motor protective circuit |
-
2018
- 2018-06-04 CN CN201810565933.3A patent/CN110556787A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769120A (en) * | 2004-09-07 | 2006-05-10 | 三菱电机株式会社 | Electric power steering controller |
| CN106640691A (en) * | 2016-12-13 | 2017-05-10 | 杭州信多达电器有限公司 | Device and method for water pump fault testing and protecting |
| CN208226558U (en) * | 2018-06-04 | 2018-12-11 | 青岛海尔智能电子有限公司 | A kind of motor protective circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083221A (en) * | 2020-10-15 | 2020-12-15 | 珠海格力电器股份有限公司 | Fault detection method and device and electrical equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10541646B2 (en) | Disconnection apparatus for a photovoltaic string, solar installation and operating method for a solar installation with a photovoltaic string | |
| US9865411B2 (en) | Safety device for a photovoltaic system | |
| US7586770B2 (en) | Interconnection inverter device | |
| CN106066450B (en) | Insulation monitoring device with voltage monitoring and method based on same | |
| US9998060B2 (en) | System and method for capacitor fault energy interruption in adjustable speed drives | |
| EP2608341A1 (en) | Grounding device | |
| CN106953304B (en) | Jack-up unit drilling well frequency conversion drive DC distribution Over Current Protection System and method | |
| CN108134378B (en) | Direct current protection system and direct current protection implementation method | |
| CN104953546A (en) | Protection detection device for photovoltaic assembly or power system as well as control method of protection detection device | |
| US10666043B2 (en) | Disconnection apparatus for a photovoltaic string, solar installation and operating method for a solar installation with a photovoltaic string | |
| CN113541122B (en) | Protection device and method for servo driver and servo motor | |
| CN109617021B (en) | Grounding detection protection method for traction converter of railway vehicle | |
| CN105591362A (en) | Safety protection circuit of blade electric vehicle motor | |
| CN112103922B (en) | Power supply protection device, method and driver | |
| CN110556787A (en) | motor protection circuit and protection control method | |
| JP7145011B2 (en) | power conditioner | |
| CN208226558U (en) | A kind of motor protective circuit | |
| CN204835513U (en) | Voltage type arc light protection device | |
| CN209963830U (en) | DC uninterrupted power system | |
| KR20210027325A (en) | Electronic protective circuit | |
| CN113162009B (en) | Over-energy protection circuit, residual current device, electronic equipment and distribution box | |
| CN210693443U (en) | Short-circuit protection device for bus of frequency converter | |
| JP4766241B2 (en) | DC voltage step-down circuit and power converter | |
| CN112152188A (en) | Protection device and method for IGBT module in frequency converter and motor system | |
| CN108574427B (en) | Frequency converter brake unit and frequency converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |