CN109921384A - A kind of brushless electric machine starting short-circuit detecting circuit and detection method - Google Patents
A kind of brushless electric machine starting short-circuit detecting circuit and detection method Download PDFInfo
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Abstract
The present invention relates to brushless motor control field, a kind of brushless electric machine starting short-circuit detecting circuit and detection method, including power supply unit, voltage regulator circuit, MCU control chip, half-bridge drive circuit, bus current detection circuit and motor are specifically disclosed；The voltage regulator circuit, bus current detection circuit and half-bridge drive circuit are separately connected MCU control chip, and the power supply unit and half-bridge drive circuit are separately connected voltage regulator circuit, and the half-bridge drive circuit connects inverter circuit, and the inverter circuit connects motor；Sampling unit is connected between the inverter circuit and bus current detection circuit; the present invention can be before electric motor starting; effective detection phase fault; quick response simultaneously; realize software or hardware short circuit delay; peripheral hardware can be used to accurately control for short circuit current, and improve detection accuracy, realize that high-precision is protected.
Description
Technical field
The present invention relates to brushless motor control field more particularly to a kind of brushless electric machine starting short-circuit detecting circuit and detections
Method.
Background technique
Brshless DC motor had both had that the structure of alternating current generator is simple, series of advantages reliable for operation and easy to maintain etc.,
But also with direct current generator operational efficiency height, good speed adjustment features, larger detent torque the features such as, in Aeronautics and Astronautics, household electrical appliances and friendship
It is logical that numerous areas is waited all to be widely used.
Brshless DC motor is made of motor body and driver, is a kind of typical electromechanical integrated product, electronic
The stator winding of machine is made into three-phase symmetrical star connection more, quite similar with threephase asynchronous.It is glued on the rotor of motor
There is the permanent magnet to have magnetized, under the work of cooperation driver, has efficiency is high, noise is low, torsion is big etc. than conventional asynchronous motor
Deng feature.
But people have found in application process, the phase fault of brushless motor damages greatly driver, if driving
The short-circuit protection of device is not in time, it is likely that causes burning for plank, the generation of fire is resulted even in when serious.Existing
It is main to be used to judge electric motor short circuit problem using triode or exclusive use amplifier amplification electric current in technology, but there are readings
The defect that obtaining current accuracy is not good enough and protection delay can not accurately control.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of brushless electric machine starting short-circuit detecting circuit and detection method,
Phase fault, while quick response can be effectively detected before electric motor starting, realize software or hardware short circuit delay, short circuit
Peripheral hardware can be used to accurately control for electric current, and improve detection accuracy, realize that high-precision is protected.
In order to solve the above technical problem, the present invention provides concrete scheme it is as follows:
A kind of brushless electric machine starting short-circuit detecting circuit, including power supply unit, voltage regulator circuit, MCU control chip, half-bridge driven electricity
Road, bus current detection circuit and motor；
The voltage regulator circuit, bus current detection circuit and half-bridge drive circuit are separately connected MCU control chip, the power supply list
Member and half-bridge drive circuit are separately connected voltage regulator circuit, and the half-bridge drive circuit connects inverter circuit, and the inverter circuit connects
Connect motor；
Sampling unit is connected between the inverter circuit and bus current detection circuit.
Optionally, capacitor C1 is also connected between the power supply unit and voltage regulator circuit.
Optionally, the sampling unit includes resistance R5.
Optionally, the inverter circuit includes power device Q1, Q2, Q3, Q4, Q5 and Q6, the power device Q1 and Q4
Series connection, the power device Q2 and Q5 series connection, the power device Q3 and Q6 series connection.
Optionally, the bus current detection circuit include voltage comparator U1, operational amplifier U2, resistance R1, R2,
R3, R4, R6, R7 and R8, capacitor C2, C3 and C4；
The first pin connection MCU of the voltage comparator U1 controls chip, and the second pin of voltage comparator U1 is separately connected
It is grounded after capacitor C2, resistance R1 and resistance R2, the resistance R2 and capacitor C2 are in parallel, the other end of the resistance R1 connects electricity
Source, the third pin of voltage comparator U1 are separately connected the first pin of operational amplifier U2, resistance R8 and capacitor C4, the electricity
Common end after resistance R8 is in parallel with capacitor C4 connects the second pin of operational amplifier U2, and the second pin of operational amplifier U2 connects
Connecting resistance R6, the other end of the resistance R6 are separately connected resistance R7 and capacitor C3, and the other end of the capacitor C3 is separately connected
Resistance R3 and R4, the third pin of the other end connection operational amplifier U2 of the resistance R3, the other end of the resistance R4 connect
Connecting resistance R5, the other end of the resistance R5 are separately connected resistance R7 and ground connection.
Optionally, the sampling unit includes resistance R011, R012 and the R013 being connected in parallel.
Optionally, the bus current detection circuit include voltage comparator U1, operational amplifier U2, resistance R01, R02,
R03, R04, R05, R06, R08, R09 and R10, capacitor C2, C3 and C4；
The first pin connection MCU of the voltage comparator U1 controls chip, and the second pin of voltage comparator U1 is separately connected
It is grounded after capacitor C2, resistance R01 and resistance R02, the resistance R02 and capacitor C2 are in parallel, the other end connection of the resistance R01
The third pin of power supply, voltage comparator U1 is separately connected the first pin of operational amplifier U2, resistance R08 and capacitor C4, institute
State resistance R08 it is in parallel with capacitor C4 after common end connect the second pin of operational amplifier U2, the second of operational amplifier U2
Pin connects resistance R05, and the other end of the resistance R05 is separately connected resistance R06 and capacitor C3, the other end of the capacitor C3
It is separately connected resistance R03, R04, R09 and R10, the third pin of the other end connection operational amplifier U2 of the resistance R03, institute
The other end for stating the other end connection resistance R011, the resistance R09 of resistance R04 connects resistance R012, and the resistance R10's is another
One end connects resistance R013.
Optionally, described resistance R04, R09 are identical with the resistance value of R010；The resistance value of described resistance R011, R012 and R013
It is identical.
The present invention also provides one kind to be applied to brushless electric machine starting method for detecting short circuit as described in claim 1, packet
Include following steps:
After MCU control chip receives electric motor starting signal, successively each corresponding power device in inverter circuit is opened in control
Part, each opening time are T1；
Whether bus current size when successively each corresponding power device is opened in detection reaches default short circuit current protection threshold
Value, a length of T2 when detection, the T1 are greater than T2 every time；
When above-mentioned any one-time detection reaches default short circuit current protection threshold value to bus current size, then MCU controls chip and closes
All power devices in disconnected inverter circuit, and it is determined as phase fault.
Optionally, the detection method further include:
If above-mentioned all detection median generatrix size of current not up to preset short circuit current protection threshold value, MCU controls chip and closes
All power devices in disconnected inverter circuit, start rotor forces location step.
Compared with prior art, the beneficial effects of the present invention are: the present invention can be effective to detect before electric motor starting
Phase fault, while quick response realize that peripheral hardware can be used to do accurate control for software or hardware short circuit delay, short circuit current
System improves detection accuracy, realizes that high-precision is protected.
Detailed description of the invention
Fig. 1 is one of embodiment of the present invention brushless motor short-circuit detecting circuit brief block diagram.
Fig. 2 is the bus current detection circuit figure in the embodiment of the present invention.
Fig. 3 is the circuit brief block diagram in another embodiment of the present invention.
Fig. 4 is the bus current detection circuit figure in another embodiment of the present invention.
Fig. 5 is one of embodiment of the present invention brushless electric machine starting method for detecting short circuit flow chart.
Fig. 6 is the short-circuit protection hardware logic relational graph in the embodiment of the present invention.
Specific embodiment
For the technical solution that the present invention will be described in detail, below in conjunction with the attached drawing of the embodiment of the present invention, to of the invention real
The technical solution for applying example carries out clear, complete description.Obviously, described embodiment is a part of the embodiments of the present invention,
Instead of all the embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art are without creativeness
Every other embodiment obtained, shall fall within the protection scope of the present invention under the premise of labour.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff it is identical.Term used herein is intended merely to description specific embodiment
Purpose, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more relevant listed items
Any and all combinations.
For example, a kind of brushless electric machine starting short-circuit detecting circuit, including power supply unit, voltage regulator circuit, MCU control chip,
Half-bridge drive circuit, bus current detection circuit and motor；The voltage regulator circuit, bus current detection circuit and half-bridge driven electricity
Road is separately connected MCU control chip, and the power supply unit and half-bridge drive circuit are separately connected voltage regulator circuit, the half-bridge driven
Circuit connection inverter circuit, the inverter circuit connect motor；It is connected between the inverter circuit and bus current detection circuit
There is sampling unit.
The present embodiment can effectively detect phase fault, while quick response before electric motor starting, reach expected short
Road protection setting improves the service life of brushless motor.
In some embodiments, as shown in Figure 1, providing a kind of brushless electric machine starting short-circuit detecting circuit, including power supply list
Member, voltage regulator circuit, MCU control chip, half-bridge drive circuit, bus current detection circuit and motor；Wherein, voltage regulator circuit, mother
Line current detection circuit and half-bridge drive circuit are separately connected MCU control chip, and power supply unit and half-bridge drive circuit connect respectively
Voltage regulator circuit is connect, half-bridge drive circuit connects inverter circuit, and inverter circuit connects motor；Inverter circuit and bus current detection electricity
Sampling unit is connected between road.
Specifically, battery can be used for power supply unit or AC turns DC power supply and provides power supply, voltage regulator circuit changes in load
Become or be still able to maintain output voltage when inputting voltage ripple of power network and be basically unchanged, prevents voltage fluctuation from causing electric appliance abnormal or event
Barrier, stable working voltage is provided to entire circuit system, it is ensured that stability in use, half-bridge drive circuit connect MCU and control core
Piece, MCU control chip and export control half-bridge drive circuit by signal, and half-bridge drive circuit connects inverter circuit, for controlling
The power device in inverter circuit is opened and closed, inverter circuit includes power device Q1, Q2, Q3, Q4, Q5 and Q6, power device
Part Q1 and Q4 series connection, power device Q2 and Q5 series connection, power device Q3 and Q6 series connection, inverter circuit connect motor, to motor into
Row driving.Bus current detection circuit acquires the pressure drop of sampling unit, and obtains bus current size by conversion, if motor
State in short circuit, then bus current is up to preset short circuit current protection threshold value, bus current detection circuit can be anti-
It presents a level signal and controls chip to MCU, so that triggering MCU control chip turns off all power devices, and short circuit is indicated
1 is set, to reach protective effect.
In some embodiments, capacitor C1 is also connected between power supply unit and voltage regulator circuit, the both ends of capacitor C1 are divided equally
It is not connect with power supply unit, voltage regulator circuit, capacitor C1 is used for burning voltage, provides stable power supply.
In some embodiments, as shown in Fig. 2, sampling unit includes resistance R5, bus current detection circuit includes voltage
Comparator U1, operational amplifier U2, resistance R1, R2, R3, R4, R6, R7 and R8, capacitor C2, C3 and C4；Voltage comparator U1's
First pin connects MCU and controls chip, and the second pin of voltage comparator U1 is separately connected capacitor C2, resistance R1 and resistance R2,
It is grounded after resistance R2 and capacitor C2 are in parallel, the other end of resistance R1 connects power supply, and the third pin of voltage comparator U1 connects respectively
The first pin, resistance R8 and capacitor C4 of operational amplifier U2 are connect, the common end after resistance R8 is in parallel with capacitor C4 connects operation
The second pin of the second pin of amplifier U2, operational amplifier U2 connects resistance R6, and the other end of resistance R6 is separately connected electricity
R7 and capacitor C3 is hindered, the other end of capacitor C3 is separately connected resistance R3 and R4, and the other end of resistance R3 connects operational amplifier U2
Third pin, the other end of resistance R4 connects resistance R5, and the other end of resistance R5 is separately connected resistance R7 and ground connection.
The pressure drop of bus current detection circuit sampling resistor R5, converses bus current size by the resistance value of resistance R5,
By operational amplifier U2, the in-phase end of voltage comparator U1 will be output to after current signal amplification (1+ (R3+R4)/R8) times
On, comparator reverse side is preset short-circuit protection electrical voltage point, is divided and is provided by R1/R2.Specific short circuit current Id calculation formula
Are as follows: Id=((VCC*R1/ (R1+R2))/(((1+R8/ (R3+R4)) * R5).Wherein, capacitor C3 can be used for adjusting short circuit input and make an uproar
The filtering of sound, capacitor C4 is for high-pass filtering and prevents self-oscillation, this kind short circuit identification circuit is generally applicable to FOC vector
Control and BLDC square wave control program.
In some embodiments, as shown in Figure 3 and Figure 4, sampling unit include resistance R011, the R012 being connected in parallel and
R013, bus current detection circuit include voltage comparator U1, operational amplifier U2, resistance R01, R02, R03, R04, R05,
R06, R08, R09 and R10, capacitor C2, C3 and C4；The first pin connection MCU of voltage comparator U1 controls chip, and voltage compares
The second pin of device U1 is separately connected capacitor C2, resistance R01 and resistance R02, is grounded after resistance R02 and capacitor C2 parallel connection, resistance
The other end of R01 connects power supply, and the third pin of voltage comparator U1 is separately connected the first pin, the resistance of operational amplifier U2
Common end after R08 and capacitor C4, resistance R08 are in parallel with capacitor C4 connects the second pin of operational amplifier U2, operation amplifier
The second pin of device U2 connects resistance R05, and the other end of resistance R05 is separately connected resistance R06 and capacitor C3, and capacitor C3's is another
End is separately connected resistance R03, R04, R09 and R10, the third pin of the other end connection operational amplifier U2 of resistance R03, resistance
The other end of R04 connects resistance R011, and the other end of resistance R09 connects resistance R012, and the other end of resistance R10 connects resistance
R013.Wherein, the resistance value of resistance R04, R09 and R010 is identical；Described resistance R011, R012 are identical with the resistance value of R013.
Circuit passes through inverter circuit driving motor, wherein R04=R09=R010, R011=R012=R013, bus current inspection
Slowdown monitoring circuit acquires the pressure drop of resistance R011, R012 and R013, converses bus electricity by the resistance value of resistance R011, R012 and R013
Size is flowed, after resistance R04, R09 and R010 partial pressure, then through operational amplifier U2, current signal is amplified into (1+R08/ (R05
+ R06)) times after be output on the in-phase end of voltage comparator U1, voltage comparator U1 reverse side be preset short-circuit protection voltage
Point is divided by R5/R6 and is provided.
Specific short circuit current Id calculation formula is following (by taking UV phase short circuit as an example): Id=((VCC*R1/ (R1+R2))/(((1
+R8/(R3+R4))*R5)。
Wherein, capacitor C3 can be used for adjusting the filtering of short circuit input noise, and capacitor C4 is for high-pass filtering and from exciting
It swings.This kind short circuit identification circuit is generally applicable to FOC vector controlled and BLDC square wave control program.
In some embodiments, as shown in figure 5, providing a kind of brushless electric machine starting method for detecting short circuit, including following step
It is rapid:
After MCU control chip receives electric motor starting signal, successively each corresponding power device in inverter circuit is opened in control
Part, each opening time are T1；
Whether bus current size when successively each corresponding power device is opened in detection reaches default short circuit current protection threshold
Value, a length of T2 when detection, the T1 are greater than T2 every time；
When above-mentioned any one-time detection reaches default short circuit current protection threshold value to bus current size, then MCU controls chip and closes
All power devices in disconnected inverter circuit, and it is determined as phase fault.
In the control system of brushless direct current motor sensorless, the starting and operating of motor are generally divided into three steps
Rapid: rotor forces location pushes away by force acceleration and closed-loop control.During rotor forces location, controller passes through conducting motor
Two-phase therein, it is compulsory that rotor dragging is attracted onto a fixed position.At this point, MCU control chip controls are opened
It wherein one group in power device, so that motivating machine winding to generate the permanent magnet on magnetic field and rotor generates actuation, finally drags
Turn is fixed to specific position.And then start to push away acceleration by force by specific conducting step, drive rotor rotation.But
In actual application process, during rotor forces location is transformed into and pushes away acceleration by force, frequent occurrence caused by phase fault
Bad phenomenon, it is serious to burn out switching device.Problem above derives from during starting, in order to keep start-up course smooth
Smooth with accelerator, pulse duty cycle high level time when starting is often shorter than short-circuit detecting delay time, in phase
Between even if short circuit starting when bus current detection route detect the electric current more than short-circuit detecting, be also not achieved protection delay when
Between, so that power device and sampling unit can be burned under the accumulation of heat of each power device switch.
Before three steps of the present embodiment in the control system of brushless direct current motor sensorless, one step of addition is opened
Dynamic short-circuit detecting, detailed process is as follows:
After MCU control chip receives electric motor starting signal, power device Q1 and Q5 are opened in control, i.e. UV is conducted, when unlatching
Long T1 is greater than short-circuit detecting duration T2, and opening time is controlled in microsecond rank, avoided since opening time is too long by the present embodiment
And operating efficiency is influenced, machine winding generates electric current after being motivated, bus current detection circuit acquires the pressure drop of sampling unit, meter
Calculation obtains bus current size at this time, if bus current size reaches default short circuit current protection threshold value at this time, illustrates
Motor is in the state of short circuit, and bus current detection circuit can feed back a level signal to MCU control chip to trigger MCU
It controls chip and turns off all power devices, and short-circuit protection mark is set 1, to reach protective effect.
If the not up to default short circuit current protection threshold of the bus current size detected when opening power device Q1 and Q5
When value, then power device Q1 and Q5 are closed, open power device Q1 and Q6, is i.e. UW is conducted, and opening time T1 is greater than short circuit inspection
Duration T2 is surveyed, machine winding generates electric current after being motivated, bus current detection circuit acquires the pressure drop of sampling unit, is calculated
Bus current size at this time illustrates at motor if bus current size reaches default short circuit current protection threshold value at this time
In the state of short circuit, bus current detection circuit can feed back a level signal to MCU control chip to trigger MCU control core
Piece turns off all power devices, and short-circuit protection mark is set 1, to reach protective effect.
If the not up to default short circuit current protection threshold of the bus current size detected when opening power device Q1 and Q6
When value, then power device Q1 and Q6 are closed, open power device Q2 and Q6, is i.e. VW is conducted, and opening time T1 is greater than short circuit inspection
Duration T2 is surveyed, machine winding generates electric current after being motivated, bus current detection circuit acquires the pressure drop of sampling unit, is calculated
Bus current size at this time illustrates at motor if bus current size reaches default short circuit current protection threshold value at this time
In the state of short circuit, bus current detection circuit can feed back a level signal to MCU control chip to trigger MCU control core
Piece turns off all power devices, and short-circuit protection mark is set 1, to reach protective effect.
In some embodiments, the detection method further include: if above-mentioned all detection median generatrix size of current do not reach
When to default short circuit current protection threshold value, MCU controls all power devices in chip shutdown inverter circuit, starts rotor and forces
Positioning step.
Specifically, if in successively detection process, bus current size not up to default short circuit current protection threshold value when,
Then illustrate that short-circuit state does not occur for circuit, then MCU controls all power devices in chip shutdown inverter circuit, starts rotor
Forces location step, reconvert push away accelerating step and closed-loop control step to strong.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Therefore it cannot understand limitations on the scope of the patent of the present invention.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range, therefore, protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of brushless electric machine starting short-circuit detecting circuit, which is characterized in that control core including power supply unit, voltage regulator circuit, MCU
Piece, half-bridge drive circuit, bus current detection circuit and motor；
The voltage regulator circuit, bus current detection circuit and half-bridge drive circuit are separately connected MCU control chip, the power supply list
Member and half-bridge drive circuit are separately connected voltage regulator circuit, and the half-bridge drive circuit connects inverter circuit, and the inverter circuit connects
Connect motor；
Sampling unit is connected between the inverter circuit and bus current detection circuit.
2. brushless electric machine starting short-circuit detecting circuit according to claim 1, which is characterized in that the power supply unit and steady
Capacitor C1 is also connected between volt circuit.
3. brushless electric machine starting short-circuit detecting circuit according to claim 1, which is characterized in that the sampling unit includes
Resistance R5.
4. brushless electric machine starting short-circuit detecting circuit according to claim 1, which is characterized in that the inverter circuit includes
Power device Q1, Q2, Q3, Q4, Q5 and Q6, the power device Q1 and Q4 series connection, the power device Q2 and Q5 series connection, it is described
Power device Q3 and Q6 series connection.
5. brushless electric machine starting short-circuit detecting circuit according to claim 3, which is characterized in that the bus current detection
Circuit includes voltage comparator U1, operational amplifier U2, resistance R1, R2, R3, R4, R6, R7 and R8, capacitor C2, C3 and C4；
The first pin connection MCU of the voltage comparator U1 controls chip, and the second pin of voltage comparator U1 is separately connected
It is grounded after capacitor C2, resistance R1 and resistance R2, the resistance R2 and capacitor C2 are in parallel, the other end of the resistance R1 connects electricity
Source, the third pin of voltage comparator U1 are separately connected the first pin of operational amplifier U2, resistance R8 and capacitor C4, the electricity
Common end after resistance R8 is in parallel with capacitor C4 connects the second pin of operational amplifier U2, and the second pin of operational amplifier U2 connects
Connecting resistance R6, the other end of the resistance R6 are separately connected resistance R7 and capacitor C3, and the other end of the capacitor C3 is separately connected
Resistance R3 and R4, the third pin of the other end connection operational amplifier U2 of the resistance R3, the other end of the resistance R4 connect
Connecting resistance R5, the other end of the resistance R5 are separately connected resistance R7 and ground connection.
6. brushless electric machine starting short-circuit detecting circuit according to claim 1, which is characterized in that the sampling unit includes
Resistance R011, R012 and the R013 being connected in parallel.
7. brushless electric machine starting short-circuit detecting circuit according to claim 6, which is characterized in that the bus current detection
Circuit includes voltage comparator U1, operational amplifier U2, resistance R01, R02, R03, R04, R05, R06, R08, R09 and R10, electricity
Hold C2, C3 and C4；
The first pin connection MCU of the voltage comparator U1 controls chip, and the second pin of voltage comparator U1 is separately connected
It is grounded after capacitor C2, resistance R01 and resistance R02, the resistance R02 and capacitor C2 are in parallel, the other end connection of the resistance R01
The third pin of power supply, voltage comparator U1 is separately connected the first pin of operational amplifier U2, resistance R08 and capacitor C4, institute
State resistance R08 it is in parallel with capacitor C4 after common end connect the second pin of operational amplifier U2, the second of operational amplifier U2
Pin connects resistance R05, and the other end of the resistance R05 is separately connected resistance R06 and capacitor C3, the other end of the capacitor C3
It is separately connected resistance R03, R04, R09 and R10, the third pin of the other end connection operational amplifier U2 of the resistance R03, institute
The other end for stating the other end connection resistance R011, the resistance R09 of resistance R04 connects resistance R012, and the resistance R10's is another
One end connects resistance R013.
8. brushless electric machine starting short-circuit detecting circuit according to claim 7, which is characterized in that described resistance R04, R09
It is identical with the resistance value of R010；Described resistance R011, R012 are identical with the resistance value of R013.
9. one kind is applied to brushless electric machine starting method for detecting short circuit as described in claim 1, which is characterized in that including following
Step:
After MCU control chip receives electric motor starting signal, successively each corresponding power device in inverter circuit is opened in control
Part, each opening time are T1；
Whether bus current size when successively each corresponding power device is opened in detection reaches default short circuit current protection threshold
Value, a length of T2 when detection, the T1 are greater than T2 every time；
When above-mentioned any one-time detection reaches default short circuit current protection threshold value to bus current size, then MCU controls chip and closes
All power devices in disconnected inverter circuit, and it is determined as phase fault.
10. brushless electric machine starting method for detecting short circuit according to claim 9, which is characterized in that the detection method is also
Include:
If above-mentioned all detection median generatrix size of current not up to preset short circuit current protection threshold value, MCU controls chip and closes
All power devices in disconnected inverter circuit, start rotor forces location step.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416326A (en) * | 2020-04-20 | 2020-07-14 | 小熊电器股份有限公司 | Motor overcurrent protection circuit and method and household appliance |
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| CN102158100A (en) * | 2011-03-01 | 2011-08-17 | 山东沃森电源设备有限公司 | Triphase variable-frequency power supply with high power and operating method thereof |
| CN108540006A (en) * | 2017-03-06 | 2018-09-14 | 株式会社丰田自动织机 | Motor inverter |
| CN208241641U (en) * | 2018-06-21 | 2018-12-14 | 中国矿业大学 | Blower variable-pitch is away from magneto phase current sensing and current foldback circuit |
| CN108964572A (en) * | 2018-06-28 | 2018-12-07 | 同济大学 | A kind of method and system for motor active fault control |
| CN209728135U (en) * | 2019-03-21 | 2019-12-03 | 惠州市蓝微电子有限公司 | A kind of brushless electric machine starting short-circuit detecting circuit |
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| CN111416326A (en) * | 2020-04-20 | 2020-07-14 | 小熊电器股份有限公司 | Motor overcurrent protection circuit and method and household appliance |
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