CN104052025B - The method of detection three phase electric machine Limiting current persistent period and circuit and washing machine - Google Patents
The method of detection three phase electric machine Limiting current persistent period and circuit and washing machine Download PDFInfo
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- CN104052025B CN104052025B CN201410266790.8A CN201410266790A CN104052025B CN 104052025 B CN104052025 B CN 104052025B CN 201410266790 A CN201410266790 A CN 201410266790A CN 104052025 B CN104052025 B CN 104052025B
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Abstract
nullThe method that the invention discloses the detection three phase electric machine Limiting current persistent period，For electricity field，Solve three phase electric machine and maintain the problem cannot being sensed under Limiting current for a long time，Pass through comparison circuit、Square wave clipper circuit and MCU realize，First preset reference voltage Vref，Then the phase current of arbitrary phase of three phase electric machine is converted to analog voltage Ui，Then pass through comparison circuit to be compared and output voltage comparison signal Uo with reference voltage V ref by analog voltage Ui，Simultaneously by MCU to the square-wave pulse signal Po that the square wave clipper circuit output cycle is Tm，Utilize square wave clipper circuit and Po signal that Uo signal is cut into the Up signal Tong Bu and anti-phase with Po signal，Up signal is fed back to MCU，Edge-triggered times N by MCU record Up signal，Thus estimate the persistent period of Limiting current，Present invention is mainly used for the abnormal operation of detection three phase electric machine such as motor's for washing machine.Additionally present invention also offers should circuit in aforementioned manners and have the washing machine of this circuit.
Description
Technical field
The present invention relates to three phase electric machine operation irregularity detection, particularly a kind of detection three phase electric machine Limiting current is held
The method of continuous time and the circuit of application the method, and there is this circuit carry out detection motor's for washing machine on boundary
The washing machine of threshold currents environment lower persistent period.
Background technology
At present, in the motor control circuit of washing machine, it is typically provided the real-time checking circuit of phase current and overcurrent
Checking circuit.Such as phase current checking circuit is by current detection phase by arbitrary phase current of motor's for washing machine
Resistance Rshunt is converted to analog voltage signal Ui, then feeds back to MCU, MCU by mark through amplifying circuit
Quasi-sampling bit value carrys out the real-time each phase current of monitoring washer motor；Overcurrent checking circuit is then by by electricity
The overcurrent reference voltage Uref that the voltage Ui of stream detection phase resistance Rshunt detection and reference resistance set makees
Relatively, if Ui is ＞ Uref, then comparator output high level feeds back to MCU interruption port to cut off PWM driving
The output of waveform and realize defencive function.Above-mentioned phase current checking circuit is in terms of washing machine abnormal operating detection
There are two drawbacks: 1. when motor's for washing machine low-speed running, owing to loop noise interference ratio is relatively big, cause
Analogue signal port sampling error is bigger than normal, it is impossible to the truth of accurate quantification motor's for washing machine real-time current；
2. in each stroke of washing machine the current value of motor's for washing machine between running current and overcurrent marginal value
Time, we term it Limiting current, electric long lasting for boundary at motor's for washing machine low-speed running and current value
During stream, above-mentioned checking circuit is cannot accurately to make abnormal detection and implement corresponding defencive function.Can
To illustrate, such as washing machine is when Normal Wash, about phase current maximum 3A of motor's for washing machine, when
When stall occurs in bucket, due to belt tension reason, motor's for washing machine not necessarily can be fully latched, but goes out
Existing belt and the belt wheel on motor drive shaft skid friction and overload operating, now phase current continue 6～
7A, this electric current is not reaching to default detection marginal value 10A of overcurrent checking circuit, and motor's for washing machine turns
Speed the most as little as lower limit alarming value, when above-mentioned situation occurs, above-mentioned phase current checking circuit and overcurrent detection
Circuit cannot be made abnormal detection and implement protective measure.Before belt rubs, motor's for washing machine line
Circle and power drive element (such as IGBT) maintain the duty of Limiting current 6～7A always and cannot do
Going out abnormal judgement, the constant temperature of final motor's for washing machine coil and power drive element rises, and may cause
The parts damages such as motor coil, power drive element or generation hidden danger.
Summary of the invention
The purpose that the present invention is to be reached just is to provide the side of a kind of detection three phase electric machine Limiting current persistent period
Method, it is possible to allow MCU judge in time and dispose three phase electric machine abnormal operation under long-time Limiting current.
In order to achieve the above object, the present invention adopts the following technical scheme that detection three phase electric machine Limiting current is held
The method of continuous time, is realized by comparison circuit, square wave clipper circuit and MCU, and step is as follows, the most in advance
If reference voltage V ref of equal value of Limiting current, then the phase current of arbitrary phase of three phase electric machine is converted to reality
Time analog voltage Ui, then pass through comparison circuit and analog voltage Ui compared with reference voltage V ref,
When comparison circuit is configured as Ui ＞ Vref, the voltage comparison signal Uo of output is direct current high level signal,
Simultaneously by MCU to the square-wave pulse signal Po that the square wave clipper circuit output cycle is Tm, utilize square wave cutting electricity
The voltage comparison signal Uo of direct current high level is cut into and square-wave pulse signal by road and square-wave pulse signal Po
Po synchronizes and anti-phase square-wave pulse signal Up, and Up signal feeds back to the edging trigger port of MCU,
After by the edge-triggered times N of the edge-triggered port record square-wave pulse signal Up of MCU, N is for being more than
In the integer of zero, thus estimate persistent period δ T, the δ T ≈ N × Tm of Limiting current.
As preferred scheme, the phase current of arbitrary phase of described three phase electric machine is converted to by Rshunt resistance
Real-time analog voltage Ui.
Present invention also offers should circuit in aforementioned manners, including comparison circuit and square wave clipper circuit,
The phase current of arbitrary phase of three phase electric machine is converted to real-time analog voltage Ui, simulation electricity by Rshunt resistance
Reference voltage V ref of equal value of pressure Ui and Limiting current is input to comparison circuit and compares, and comparison circuit is defeated
Going out voltage comparison signal Uo, square wave clipper circuit is made up of audion, the base stage of audion and the square wave of MCU
Pulse signal output end mouth P0 connects, and the colelctor electrode of audion is connected on the outfan of comparison circuit, three poles
The grounded emitter of pipe, with the edge-triggered of MCU after the colelctor electrode of the outfan connecting triode of comparison circuit
Port IRQ connects.
As preferred scheme, described comparison circuit is made up of comparator, and analog voltage Ui accesses comparator
In-phase input end, Limiting current reference voltage V ref accesses the inverting input of comparator, the output of comparator
End connects after current-limiting resistance and is connected with the colelctor electrode of audion, with the limit of MCU after a filter capacitor the most in parallel
Edge triggers port IRQ and connects.
Further preferred scheme, described three phase electric machine is motor's for washing machine.
Present invention also offers a kind of washing machine, including motor's for washing machine, described motor's for washing machine is three-phase electricity
Machine, washing machine has foregoing circuit for detection motor's for washing machine persistent period under Limiting current environment.
After using technique scheme, present invention have the advantage that and comparison circuit is configured to, work as three-phase
There is Limiting current in motor, and i.e. during Ui >=Vref, the voltage comparison signal Uo of output is direct current high level letter
Number, the cycle of MCU output square-wave pulse signal Po is Tm, utilizes square wave clipper circuit by direct current high level
Voltage comparison signal Uo is cut into square-wave pulse signal Up, the Up signal Tong Bu and anti-phase with Po and feeds back to MCU,
Can (i.e. high level becomes low level time by the edge-triggered times N of MCU record square-wave pulse signal Up
Number), N is the integer more than or equal to zero, thus estimates persistent period δ T, the δ T ≈ N × Tm of Limiting current.
By MCU, δ T can be compared, if δ is T with the restriction Limiting current maximum length in time Tset preset
>=Tset, then send abnormal detection signal and interrupt the driving signal of three phase electric machine, such as should in washing machine
With, it is possible to avoid the components over time such as the coil of motor's for washing machine, power drive element to maintain boundary electricity
Under stream environment, reduce washing machine quality loss, it is ensured that the portions such as the coil of motor's for washing machine, power drive element
The service life of part, it is to avoid some relevant safety issues.
Accompanying drawing explanation
The invention will be further described below in conjunction with the accompanying drawings:
Fig. 1 is the schematic diagram of circuit in the present invention；
Fig. 2 is the logical relation schematic diagram of voltage signal in comparison circuit；
Fig. 3 is the logical relation schematic diagram of voltage signal in square wave clipper circuit.
Detailed description of the invention
Embodiment one:
Present embodiments provide the inspection method of detection three phase electric machine Limiting current persistent period, Limiting current quilt
It is defined as the phase current between running current and overcurrent marginal value in the arbitrary phase of three phase electric machine, on
Stating inspection method to be realized by comparison circuit, square wave clipper circuit and MCU, step is as follows, first presets boundary
Threshold currents reference voltage V ref, is then converted to real-time simulation electricity by the phase current of arbitrary phase of three phase electric machine
Pressure Ui, then passes through comparison circuit and is compared with Limiting current reference voltage V ref by analog voltage Ui,
When comparison circuit is configured as Ui ＞ Vref, the voltage comparison signal Uo of output is direct current high level signal,
Simultaneously by MCU to the square-wave pulse signal Po that the square wave clipper circuit output cycle is Tm, utilize square wave cutting electricity
The voltage comparison signal Uo of direct current high level is cut into and square-wave pulse signal by road and square-wave pulse signal Po
Po synchronizes and anti-phase square-wave pulse signal Up, and Up signal feeds back to the edge triggered interruption port of MCU,
Finally by the edge-triggered times N of MCU record square-wave pulse signal Up, N is the integer more than or equal to zero,
Thus estimate persistent period δ T, the δ T ≈ N × Tm of Limiting current.
Analog voltage Ui can be converted by Rshunt resistance by the phase current of arbitrary phase of three phase electric machine,
This method is very simple, and in real time, accurately.In addition, it would however also be possible to employ other modes obtain mould
Intend voltage Ui.
Limiting current reference voltage V ref is usually set to the phase current I more than three phase electric machine when normally working
Analog voltage corresponding to maximum, such as, the phase current I of three phase electric machine maximum when normal work is
About 3A, then Vref can be set as Rshunt × (4～5) A, and Ui=I × Rshunt.
Embodiment two:
The present embodiment is that the method in Application Example one carrys out detection motor's for washing machine at boundary electricity in washing machine
The circuit of stream environment lower persistent period, specifically includes comparison circuit 1 and square wave clipper circuit 2, such as Fig. 1 institute
Showing, the motor control circuit of washing machine typically has the electric current of the phase current for coordinating detection motor's for washing machine
Detection phase resistance Rshunt, current detection phase resistance Rshunt is in series with the A of motor's for washing machine M, therefore
Real-time analog voltage can be exported between current detection phase resistance Rshunt and the A phase of motor's for washing machine M
Ui, Ui=I × Rshunt, I are the phase current of motor's for washing machine M, and comparison circuit 1 is made up of comparator N,
Connect on the in-phase input end of comparator N a current-limiting resistance R1, and analog voltage Ui accesses the homophase of comparator N
Input, Limiting current reference voltage V ref is connected with the inverting input of comparator N, analog voltage Ui
Compared and output voltage comparison signal Uo by comparator N with Limiting current reference voltage V ref, square wave
Clipper circuit 2 is made up of audion Q, the square wave of base series one divider resistance R3 Yu MCU of audion Q
Pulse signal output end mouth P0 connects, the grounded emitter of audion Q, and the outfan of comparator N connects and divides
After piezoresistance R2, the colelctor electrode with audion Q is connected, with the limit of MCU after a filter capacitor C1 the most in parallel
Edge triggers port IRQ and connects.
When Limiting current occurs in motor's for washing machine, i.e. during Ui >=Vref, the voltage ratio of comparison circuit output is relatively believed
Number Uo is direct current high level signal, and the logical relation of Ui signal correspondence Uo signal is as in figure 2 it is shown, P0 port
The cycle of output square-wave pulse signal Po is Tm, utilizes the switching characteristic of audion, is cut into by Uo signal
Tong Bu with Po signal and anti-phase square-wave pulse signal Up, the logic of Uo signal Up signal corresponding with Po signal
Relation as it is shown on figure 3, the cycle of Up is also Tm, Up signal feed back to MCU edge-triggered port IRQ after,
By the edge-triggered times N of edge-triggered port IRQ record Up signal, thus Limiting current can be estimated
Persistent period δ T, δ T ≈ N × Tm, such as Fig. 3 in, δ T ≈ 3 × Tm.Next MCU can just be passed through
δ T is compared with the restriction Limiting current maximum length in time Tset preset, if δ is T >=and Tset, then send out
Go out abnormal detection signal and interrupt the driving signal of motor's for washing machine, it is to avoid motor coil, power drive element
Maintain under Limiting current environment Deng components over time, reduce washing machine quality loss, it is ensured that motor coil,
The service life of the parts such as power drive element, it is to avoid some relevant safety issues.Motor's for washing machine is just
Often work, i.e. Ui ＜ Vref, then voltage comparison signal Uo remains low level signal, MCU edge-triggered end
The edge-triggered number of times of mouth IRQ record is 0, the situation of erroneous judgement also would not occurs.
The present embodiment can be used for detection motor's for washing machine B phase or the Limiting current persistent period of C phase.And
In addition to motor's for washing machine, it is also possible to apply on other three phase electric machine.
Embodiment three:
The present embodiment provides a kind of washing machine, and including motor's for washing machine, motor's for washing machine is three phase electric machine, washes
Clothing facility have the circuit in embodiment two, it is possible to the method in Application Example one is carried out detection motor's for washing machine and existed
Persistent period under Limiting current environment.
" connection " in the present invention each means electrical connection.In addition to above preferred embodiment, the present invention also also has
Other embodiment, those skilled in the art can be variously modified according to the present invention and deform, as long as
Without departing from the spirit of the present invention, the scope defined in claims of the present invention all should be belonged to.
Claims (6)
1. the method for detection three phase electric machine Limiting current persistent period, it is characterised in that: by comparison circuit,
Square wave clipper circuit and MCU realize, and step is as follows, first reference voltage V ref of equal value of preset bounds electric current,
Then the phase current of arbitrary phase of three phase electric machine is converted to real-time analog voltage Ui, then passes through comparison electric
Analog voltage Ui is compared by road with reference voltage V ref, when comparison circuit is configured as Ui ＞ Vref
The voltage comparison signal Uo of output is direct current high level signal, simultaneously by MCU to square wave clipper circuit output week
Phase is the square-wave pulse signal Po of Tm, utilizes square wave clipper circuit and square-wave pulse signal Po by direct current height electricity
Flat voltage comparison signal Uo is cut into the square-wave pulse signal Up Tong Bu and anti-phase with square-wave pulse signal Po,
Up signal is fed back to the edging trigger port of MCU, finally by the edge-triggered port record square wave arteries and veins of MCU
Rushing the edge-triggered times N of signal Up, N is the integer more than or equal to zero, thus estimates Limiting current
Persistent period δ T, δ T ≈ N × Tm.
Method the most according to claim 1, it is characterised in that: the phase of arbitrary phase of described three phase electric machine
Electric current is converted to real-time analog voltage Ui by Rshunt resistance.
3. the circuit of method described in application claim 2, it is characterised in that: include comparison circuit and square wave
Clipper circuit, the phase current of the arbitrary phase of three phase electric machine is converted to real-time analog voltage Ui by Rshunt resistance,
Reference voltage V ref of equal value of analog voltage Ui and Limiting current is input to comparison circuit and compares, and compares
Circuit output voltage comparison signal Uo, square wave clipper circuit is made up of audion, the base stage of audion and MCU
Square-wave pulse signal output port P0 connect, the colelctor electrode of audion is connected on the outfan of comparison circuit,
The grounded emitter of audion, with the interruption of MCU after the colelctor electrode of the outfan connecting triode of comparison circuit
Port IRQ connects.
Circuit the most according to claim 3, it is characterised in that: described comparison circuit is made up of comparator,
Analog voltage Ui accesses the in-phase input end of comparator, and Limiting current reference voltage V ref accesses comparator
Inverting input, the outfan of comparator is connected with the colelctor electrode of audion, the most also after connecting current-limiting resistance
After joining a filter capacitor, the interruptive port IRQ with MCU is connected.
5. according to the circuit described in claim 3 or 4, it is characterised in that: described three phase electric machine is washing machine
Motor.
6. washing machine, including motor's for washing machine, described motor's for washing machine is three phase electric machine, it is characterised in that:
Washing machine has the circuit described in claim 3 for detection motor's for washing machine holding under Limiting current environment
The continuous time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410266790.8A CN104052025B (en) | 2014-06-16 | 2014-06-16 | The method of detection three phase electric machine Limiting current persistent period and circuit and washing machine |
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| CN201410266790.8A CN104052025B (en) | 2014-06-16 | 2014-06-16 | The method of detection three phase electric machine Limiting current persistent period and circuit and washing machine |
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| KR102295580B1 (en) * | 2017-04-04 | 2021-08-30 | 현대자동차주식회사 | Controlling apparatus and method for senscing ovecurrent of dc motor for vehicle |
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| US20020139338A1 (en) * | 2001-03-30 | 2002-10-03 | Mitsubishi Denki Kabushiki Kaisha | Apparatus and method for preventing overrun of starter for engine |
| CN103022976A (en) * | 2012-12-13 | 2013-04-03 | 广州三晶电气有限公司 | Frequency converter output short circuit protection circuit and protection method |
| CN103457243A (en) * | 2013-09-02 | 2013-12-18 | 深圳市大族激光科技股份有限公司 | Direct current motor protection circuit |
| CN103855687A (en) * | 2014-02-25 | 2014-06-11 | 大洋电机新动力科技有限公司 | Electric vehicle IGBT overcurrent protection method and circuit with method applied |
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2014
- 2014-06-16 CN CN201410266790.8A patent/CN104052025B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020139338A1 (en) * | 2001-03-30 | 2002-10-03 | Mitsubishi Denki Kabushiki Kaisha | Apparatus and method for preventing overrun of starter for engine |
| CN103022976A (en) * | 2012-12-13 | 2013-04-03 | 广州三晶电气有限公司 | Frequency converter output short circuit protection circuit and protection method |
| CN103457243A (en) * | 2013-09-02 | 2013-12-18 | 深圳市大族激光科技股份有限公司 | Direct current motor protection circuit |
| CN103855687A (en) * | 2014-02-25 | 2014-06-11 | 大洋电机新动力科技有限公司 | Electric vehicle IGBT overcurrent protection method and circuit with method applied |
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Effective date of registration: 20210203 Address after: 310018 No.2, Songqiao street, Hangzhou Economic and Technological Development Zone, Hangzhou City, Zhejiang Province Patentee after: PANASONIC HOME APPLIANCES (CHINA) Co.,Ltd. Patentee after: Hangzhou Matsushita Household Appliances Co.,Ltd. Address before: 310018 3-A, No. 6 Songqiao Street, Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: PANASONIC HOME APPLIANCES R&D CENTER (HANGZHOU) Co.,Ltd. Patentee before: Hangzhou Matsushita Household Appliances Co.,Ltd. |
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