CN203153384U - Rice cooker and motor driving device used for same - Google Patents
Rice cooker and motor driving device used for same Download PDFInfo
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- CN203153384U CN203153384U CN2012207499407U CN201220749940U CN203153384U CN 203153384 U CN203153384 U CN 203153384U CN 2012207499407 U CN2012207499407 U CN 2012207499407U CN 201220749940 U CN201220749940 U CN 201220749940U CN 203153384 U CN203153384 U CN 203153384U
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Abstract
The utility model discloses a motor driving device used for a rice cooker, which comprises a detection module, a feedback module, a driver module and a control module, wherein the detection module outputs a detection signal according to the rotational speed of a motor; the feedback module is connected with the detection module; the driver module is connected with the motor and drives the motor; and the control module is connected with the feedback module and the driver module respectively, determines the rotational speed of the motor according to the detection signal fed back by the feedback module, and adjusts the output control signal according to the rotational speed of the motor so as to control the rotational speed of the motor. The motor driving device used for the rice cooker is simple in structure, few in components, low in cost and capable of achieving the driving control of the rotational speed of the motor. The utility model further discloses the rice cooker provided with the motor driving device.
Description
Technical field
The utility model relates to household electrical appliance technical field, particularly a kind of motor driver and a kind of electric cooker with this motor driver for electric cooker.
Background technology
At present, direct current generator is used for realizing that as the important component part of electric cooker system actuator intelligent electric cooker is cooked fast and the control of speed.The direct service behaviour of cooking that influences of variable-speed DC motor-drive circuit, therefore good drive circuit is to realize stable, the reliable important leverage of product.Wherein, motor is commonly called as " motor ", refers to realize electric energy conversion or a kind of calutron that transmits according to the law of electromagnetic induction.Direct current generator refers to define the electric rotating machine of exporting or being input as direct current energy.Brshless DC motor is a kind of small-power direct current generator with electronic commutation, and it is to replace mechanical commutator in the general direct current generator with the semiconductor inverter, and formation does not have the direct current generator of commutator.
In the prior art, it is to utilize CMOS(ComplementaryMetal Oxide Semiconductor that a kind of direct current motor drive circuit is arranged, complementary metal oxide semiconductors (CMOS)) type H bridge drive circuit, PWM(Pulse Width Modulation, pulse width modulation) drives that solid-state relay or relay circuit function realize.But this direct current motor drive circuit need drive with 4 CMOS pipes, and circuit complexity, components and parts are many, cause the increase of cost, and software program is controlled also more complicated simultaneously, and direct current generator does not have feedback processing, can not carry out variable speed drive control.
In addition, also have a kind of direct current motor drive circuit, it adopts dual power supply, one the road supplies with the digital circuit part, artificial circuit part is supplied with on another road, and digital circuit and analog circuit are realized the signal transmission by optocoupler U1, U2, guarantees the operation of CMOS type H bridge drive circuit.Yet this drive circuit need adopt dual power supply design, a plurality of resistance, triode to form NAND gate 4 CMOS pipes are driven, and circuit complexity, components and parts are many, cause the increase of cost.Simultaneously, software program is controlled also more complicated, and direct current generator does not have feedback processing equally, can not carry out variable speed drive.
Therefore, the shortcoming that prior art exists is, drive circuit complexity, components and parts are many, the cost height.Simultaneously, software program is controlled also more complicated, and direct current generator does not have feedback processing, can not carry out variable speed drive.
The utility model content
The purpose of this utility model is intended to solve at least one of above-mentioned technological deficiency.
For this reason, a purpose of the present utility model is to propose the motor driver that is used for electric cooker that a kind of circuit structure is simple, components and parts are few, cost is low, realizes the control of motor speed.
Another purpose of the present utility model is also to propose a kind of electric cooker, comprises above-mentioned motor driver.
For achieving the above object, a kind of motor driver for electric cooker that the utility model proposes on the one hand comprises: detection module, and described detection module is according to the rotating speed of motor output detection signal; Feedback module, described feedback module links to each other with described detection module; Driver module, described driver module links to each other with described motor, and described driver module drives described motor; And control module, described control module links to each other with described driver module with described feedback module respectively, described control module is judged described rotating speed of motor according to the detection signal of described feedback module feedback, and exports control signal to control described rotating speed of motor according to described rotating speed of motor adjustment.
According to the motor driver that is used for electric cooker that the utility model proposes, the detection signal that control module feeds back according to feedback module is realized the judgement to rotating speed of motor, control the virtual value of electric moter voltage by adjusting control signal then, thereby reach the purpose of real-time control motor speed, make rotating speed of motor controlled.And this motor driver circuit structure is simple, the reliability height.
Wherein, described control signal is the pulse width modulation (PWM) signal.
And during greater than preset rotation speed, described control module reduces the dutycycle of described pwm signal in described rotating speed of motor.During less than described preset rotation speed, described control module increases the dutycycle of described pwm signal in described rotating speed of motor.Realize adjusting the virtual value of electric moter voltage by the dutycycle of adjusting pwm signal.
Particularly, described detection module comprises: Hall element, described Hall element link to each other with second coil with first coil of described motor respectively; First resistance, an end of described first resistance link to each other with described second coil with described Hall element respectively; First triode, the base stage of described first triode links to each other with the other end of described first resistance, the grounded emitter of described first triode; Second resistance, an end of described second resistance link to each other the other end ground connection of described second resistance with the base stage of described first triode and the other end of described first resistance respectively.
Particularly, described feedback module comprises: connect the 3rd resistance and first electric capacity, node between described the 3rd resistance and described first electric capacity links to each other with the colelctor electrode of described first triode, and an end of described the 3rd resistance links to each other with first power supply, an end ground connection of described first electric capacity; The 4th resistance, an end of described the 4th resistance links to each other with node between described the 3rd resistance and described first electric capacity, and the other end of described the 4th resistance links to each other with described control module.
Particularly, described driver module comprises: diode connected in parallel, second electric capacity and the 3rd electric capacity, one end of the anode of described diode, second electric capacity and the negative pole end ground connection of described the 3rd electric capacity, the other end of the negative electrode of described diode, second electric capacity all links to each other with described second coil with described first coil respectively with the positive terminal of described the 3rd electric capacity; Second triode, the emitter stage of described second triode links to each other respectively with the other end of the negative electrode of described diode, second electric capacity and the positive terminal of described the 3rd electric capacity, and the colelctor electrode of described second triode links to each other with second source; The 5th resistance, an end of described the 5th resistance links to each other with the colelctor electrode of described second triode, and the other end of described the 5th resistance links to each other with the base stage of described second triode; The 6th resistance, an end of described the 6th resistance links to each other with an end of described the 5th resistance; The 3rd triode, the colelctor electrode of described the 3rd triode links to each other with the other end of described the 6th resistance, the grounded emitter of described the 3rd triode; The 7th resistance, an end of described the 7th resistance links to each other with the base stage of described the 3rd triode, the other end ground connection of described the 7th resistance; The 8th resistance, an end of described the 8th resistance links to each other with the base stage of described the 3rd triode, and the other end of described the 8th resistance links to each other with described control module.
The motor driver that is used for electric cooker that the utility model proposes all adopts components and parts such as resistance, electric capacity, triode, and circuit structure is simple, components and parts are few, greatly reduces cost, and circuit performance is stable, the reliability height.
The utility model has also proposed a kind of electric cooker, comprises the above-mentioned motor driver that is used for electric cooker.
The aspect that the utility model is additional and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Description of drawings
Above-mentioned and/or the additional aspect of the utility model and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the block diagram according to the motor driver that is used for electric cooker of an embodiment of the utility model; And
Fig. 2 is the circuit diagram according to the motor driver that is used for electric cooker of an embodiment of the utility model.
Reference numeral:
Detection module 10, feedback module 20, driver module 30 and control module 40, motor 50; Interrupting input end mouth INT1 and output port PWM1, Hall element IC1, first resistance R 1, the first triode Q1 and second resistance R 2, the 3rd resistance R 3, first capacitor C 1 and the 4th resistance R 4, diode D1, second capacitor C 2, the 3rd capacitor C 3, the second triode Q2, the 5th resistance R 5, the 6th resistance R 6, the 3rd triode Q3, the 7th resistance R 7 and the 8th resistance R 8.
The specific embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein identical or similar label is represented identical or similar elements or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Disclosing hereinafter provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter parts and the setting to specific examples is described.Certainly, they only are example, and purpose does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and purpose clearly, itself not indicate the relation between the various embodiment that discuss of institute and/or the setting.In addition, various specific technology and examples of material that the utility model provides, but those of ordinary skills can recognize the property of can be applicable to of other technologies and/or the use of other materials.In addition, first feature described below second feature it " on " structure can comprise that first and second features form the embodiment of direct contact, can comprise that also additional features is formed on the embodiment between first and second features, such first and second features may not be direct contacts.
In description of the present utility model, need to prove, unless otherwise prescribed and limit, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly to link to each other, and also can link to each other indirectly by intermediary, for the ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be.
With reference to following description and accompanying drawing, with these and other aspects of clear embodiment of the present utility model.In these descriptions and accompanying drawing, some specific implementations among the embodiment of the present utility model are specifically disclosed, represent to implement some modes of the principle of embodiment of the present utility model, but should be appreciated that the scope of embodiment of the present utility model is not limited.On the contrary, embodiment of the present utility model comprises spirit and interior all changes, modification and the equivalent of intension scope that falls into institute's additional claims.
Describe with reference to the accompanying drawings according to the motor driver that is used for electric cooker that the utility model proposes.
Fig. 1 is the block diagram according to the motor driver that is used for electric cooker of an embodiment proposition of the utility model.As shown in Figure 1, should comprise detection module 10, feedback module 20, driver module 30 and control module 40 for the motor driver 100 of electric cooker.
Wherein, detection module 10 is according to the rotating speed output detection signal of motor 50.That is to say that motor 50 whenever circles, detection module 10 is just exported a for example detection signal of pulse square wave, says that namely the rotating speed of motor 50 is more high, and the frequency of pulse square wave is more big.
As shown in Figure 1, feedback module 20 links to each other with detection module 10, and 20 pairs of detection signals of the feedback module for example waveform of pulse square wave carry out filtering, current limliting.Driver module 30 links to each other with motor 50, and driver module 30 is used for output drive signal and comes drive motors 50.Control module 40 links to each other with driver module 30 with feedback module 20 respectively, and the detection signal that control module 40 is fed back according to feedback module 20 is judged the rotating speed of motor 50, and exports control signal with the rotating speed of control motor 50 according to the rotating speed adjustment of motor 50.
In an embodiment of the present utility model, as shown in Figure 2, control module 40 comprises interrupting input end mouth INT1 and output port PWM1.Wherein, interrupting input end mouth INT1 is connected with the output of feedback module 20, and output port PWM1 is connected with the input of driver module 30, and the control signal of control module 40 outputs is pwm signal.In an example of the present utility model, control module 40 can be single-chip microcomputer, and motor 50 is brshless DC motor.An I/O output port control dc brushless motor of single-chip microcomputer, another I/O input port of single-chip microcomputer carries out DC brushless motor speed and detects, and realizes the control of motor speed.
Further, during greater than preset rotation speed, control module 40 reduces the dutycycle of pwm signal, to reduce the virtual value of electric moter voltage, makes the motor speed step-down at the rotating speed of motor 50.During less than preset rotation speed, control module 40 increases the dutycycle of pwm signals, to improve the virtual value of electric moter voltage, motor speed is increased at the rotating speed of motor 50.Therefore, the dutycycle of the pwm signal by adjusting control module 40 outputs realizes adjusting the virtual value of electric moter voltage, and then realizes the adjustment to motor speed.Wherein, the preset rotation speed of motor can be demarcated according to actual conditions.
Particularly, in an embodiment of the present utility model, as shown in Figure 2, detection module 10 comprises Hall element IC1, first resistance R 1, the first triode Q1 and second resistance R 2.Wherein, Hall element IC1 comprises power pin VCC, pin DO, pin DOB and ground pin GND, Hall element IC1 links to each other with the second coil L2 with the first coil L1 of motor 50 respectively, namely the end of the first coil L1 links to each other with the DO pin of Hall element IC1, the other end of the first coil L1 links to each other with the power pin VCC of Hall element IC1, the end of the second coil L2 links to each other with the pin DOB of Hall element IC1, the other end of the second coil L2 also links to each other with the power pin VCC of Hall element IC1, the ground pin GND ground connection of Hall element IC1.One end of first resistance R 1 links to each other with the pin DOB of Hall element IC1 and the end of the second coil L2 respectively.The base stage b of the first triode Q1 links to each other with the other end of first resistance R 1, the emitter e ground connection of the first triode Q1, one end of second resistance R 2 links to each other the other end ground connection of second resistance R 2 with the base stage b of the first triode Q1 and the other end of first resistance R 1 respectively.Wherein, the first triode Q1 is the signal detection switch, and resistance R 1 mainly plays metering function, reduces by the power consumption of the first triode Q1, and resistance R 2 is reliably ended the first triode Q1.
In the present embodiment, as shown in Figure 2, feedback module 20 comprises the 3rd resistance R 3, first capacitor C 1 and the 4th resistance R 4.Wherein, the 3rd resistance R 3 and first capacitor C 1 are connected in series, and the node between the 3rd resistance R 3 and first capacitor C 1 links to each other with the colelctor electrode c of the first triode Q1, and an end of the 3rd resistance R 3 links to each other with the first power vd D, an end ground connection of first capacitor C 1.One end of the 4th resistance R 4 links to each other with node between the 3rd resistance R 3 and first capacitor C 1, and the other end of the 4th resistance R 4 links to each other with the interrupting input end mouth INT1 of control module 40.
In the present embodiment, as shown in Figure 2, driver module 30 comprises diode D1, second capacitor C 2, the 3rd capacitor C 3, the second triode Q2, the 5th resistance R 5, the 6th resistance R 6, the 3rd triode Q3, the 7th resistance R 7 and the 8th resistance R 8.Diode D1, second capacitor C 2 and the 3rd capacitor C 3 are connected in parallel, and the negative pole end ground connection of an end of the anode of diode D1, second capacitor C 2 and the 3rd capacitor C 3, the other end of the negative electrode of diode D1, second capacitor C 2 all links to each other with the other end of the first coil L1 and the other end of the second coil L2 respectively with the positive terminal of the 3rd capacitor C 3.The emitter e of the second triode Q2 links to each other respectively with the negative electrode of diode D1, the other end of second capacitor C 2 and the positive terminal of the 3rd capacitor C 3, and the colelctor electrode c of the second triode Q2 and second source the VPP(for example voltage of second source VPP are the rated voltage of motor) link to each other.One end of the 5th resistance R 5 links to each other with the colelctor electrode c of the second triode Q2, and the other end of the 5th resistance R 5 links to each other with the base stage b of the second triode Q2, and an end of the 6th resistance R 6 links to each other with an end of the 5th resistance R 5.The colelctor electrode c of the 3rd triode Q3 links to each other with the other end of the 6th resistance R 6, the emitter e ground connection of the 3rd triode Q3, one end of the 7th resistance R 7 links to each other with the base stage b of the 3rd triode Q3, the other end ground connection of the 7th resistance R 7, one end of the 8th resistance R 8 links to each other with the base stage b of the 3rd triode Q3, and the other end of the 8th resistance R 8 links to each other with the output port PWM1 of control module 40.
Wherein, the second triode Q2 and the 3rd triode Q3 form push-pull circuit.The 3rd triode Q3 is gauge tap, the resistance R 8 main metering functions that rise, and the power consumption of reduction triode Q3, resistance R 7 is reliably ended triode Q3.Similarly, the second triode Q2 also is gauge tap, the resistance R 6 main metering functions that rise, and the power consumption of reduction triode Q2, resistance R 5 is reliably ended triode Q2.When motor 50 stops; the reverse afterflow of diode D1 can discharge the self-induced e.m.f that motor coil produces; suppress backward voltage and protect the driving triode effectively, and the 3rd capacitor C 3 second source VPP when the second triode Q2 conducting charges to it, for electric moter voltage work provides energy.
The motor driver 100 that is used for electric cooker that the utility model proposes all adopts components and parts such as resistance, electric capacity, triode, and circuit structure is simple, components and parts are few, greatly reduces cost, and circuit performance is stable, the reliability height.
That is to say that in embodiment of the present utility model, the pin DOB output voltage of the Hall element IC1 by detection module 10 when the base voltage of triode Q1 during greater than certain value, triode Q1 conducting, forms low level at the colelctor electrode of triode Q1; When the base voltage of triode Q1 drops to when being lower than certain value again, triode Q1 ends, and the colelctor electrode of triode Q1 forms high level by pull-up resistor R3.Like this, conducting repeatedly by triode Q1, end, motor 50 whenever circles, just export the detection signal of a pulse square wave, the pulse square wave waveform of output is by capacitor C 1 filtering in the feedback module 20, again by being input to the input port INT1 of control module 40 after resistance R 3 current limlitings in the feedback module 20.The pulse square wave frequency of 40 pairs of inputs of control module detects, and judges the rotating speed of motor 50.If the rotating speed of motor 50 is lower than preset rotation speed, 40 dutycycles that strengthen the output of control signal pwm signal of control module, the virtual value of raising electric moter voltage increases the rotating speed of motor 50; If the rotating speed of motor 50 is higher than preset rotation speed, 40 of control modules reduce the dutycycle of control signal pwm signal output, reduce the virtual value of electric moter voltage, make the rotating speed step-down of motor 50, thereby realize the adjusting control to motor speed.
The motor driver 100 that is used for electric cooker according to the utility model embodiment, the detection signal that control module 40 feeds back according to feedback module 20 is realized the judgement to the rotating speed of motor 50, control the virtual value of electric moter voltage by adjusting control signal then, thereby reach the purpose of real-time control motor speed, make rotating speed of motor controlled.And the circuit structure of this motor driver 100 is simple, and the reliability height has also reduced components and parts simultaneously, greatly reduces cost,
In addition, another embodiment of the present utility model has also proposed a kind of electric cooker, and it comprises the above-mentioned motor driver 100 that is used for electric cooker.This electric cooker is controlled more intelligent, hommization, satisfies people's living needs.
In the description of this specification, concrete feature, structure, material or characteristics that the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example description are contained at least one embodiment of the present utility model or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete feature, structure, material or the characteristics of description can be with the suitable manner combination in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that under the situation that does not break away from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present utility model is by claims and be equal to and limit.
Claims (8)
1. a motor driver that is used for electric cooker is characterized in that, comprising:
Detection module, described detection module is according to the rotating speed of motor output detection signal;
Feedback module, described feedback module links to each other with described detection module;
Driver module, described driver module links to each other with described motor, and described driver module drives described motor; And
Control module, described control module links to each other with described driver module with described feedback module respectively, described control module is judged described rotating speed of motor according to the detection signal of described feedback module feedback, and exports control signal to control described rotating speed of motor according to described rotating speed of motor adjustment.
2. the motor driver for electric cooker as claimed in claim 1, it is characterized in that: described control signal is the pulse width modulation (PWM) signal.
3. the motor driver for electric cooker as claimed in claim 2 is characterized in that: during greater than preset rotation speed, described control module reduces the dutycycle of described pwm signal in described rotating speed of motor.
4. the motor driver for electric cooker as claimed in claim 3 is characterized in that: during less than described preset rotation speed, described control module increases the dutycycle of described pwm signal in described rotating speed of motor.
5. the motor driver for electric cooker as claimed in claim 1 is characterized in that, described detection module comprises:
Hall element, described Hall element link to each other with second coil with first coil of described motor respectively;
First resistance, an end of described first resistance link to each other with described second coil with described Hall element respectively;
First triode, the base stage of described first triode links to each other with the other end of described first resistance, the grounded emitter of described first triode;
Second resistance, an end of described second resistance link to each other the other end ground connection of described second resistance with the base stage of described first triode and the other end of described first resistance respectively.
6. the motor driver for electric cooker as claimed in claim 5 is characterized in that, described feedback module comprises:
Connect the 3rd resistance and first electric capacity, the node between described the 3rd resistance and described first electric capacity links to each other with the colelctor electrode of described first triode, and an end of described the 3rd resistance links to each other with first power supply, an end ground connection of described first electric capacity;
The 4th resistance, an end of described the 4th resistance links to each other with node between described the 3rd resistance and described first electric capacity, and the other end of described the 4th resistance links to each other with described control module.
7. the motor driver for electric cooker as claimed in claim 5 is characterized in that, described driver module comprises:
Diode connected in parallel, second electric capacity and the 3rd electric capacity, one end of the anode of described diode, second electric capacity and the negative pole end ground connection of described the 3rd electric capacity, the positive terminal of the other end of the negative electrode of described diode, second electric capacity and described the 3rd electric capacity links to each other with described first coil respectively, and the negative electrode of described diode, the other end of second electric capacity and the positive terminal of described the 3rd electric capacity also link to each other with described second coil respectively;
Second triode, the emitter stage of described second triode links to each other respectively with the other end of the negative electrode of described diode, second electric capacity and the positive terminal of described the 3rd electric capacity, and the colelctor electrode of described second triode links to each other with second source;
The 5th resistance, an end of described the 5th resistance links to each other with the colelctor electrode of described second triode, and the other end of described the 5th resistance links to each other with the base stage of described second triode;
The 6th resistance, an end of described the 6th resistance links to each other with an end of described the 5th resistance;
The 3rd triode, the colelctor electrode of described the 3rd triode links to each other with the other end of described the 6th resistance, the grounded emitter of described the 3rd triode;
The 7th resistance, an end of described the 7th resistance links to each other with the base stage of described the 3rd triode, the other end ground connection of described the 7th resistance;
The 8th resistance, an end of described the 8th resistance links to each other with the base stage of described the 3rd triode, and the other end of described the 8th resistance links to each other with described control module.
8. an electric cooker is characterized in that, comprises each described motor driver for electric cooker as claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207499407U CN203153384U (en) | 2012-12-31 | 2012-12-31 | Rice cooker and motor driving device used for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207499407U CN203153384U (en) | 2012-12-31 | 2012-12-31 | Rice cooker and motor driving device used for same |
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| Publication Number | Publication Date |
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| CN203153384U true CN203153384U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012207499407U Expired - Fee Related CN203153384U (en) | 2012-12-31 | 2012-12-31 | Rice cooker and motor driving device used for same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104068739A (en) * | 2014-06-20 | 2014-10-01 | 郭裴哲 | Intelligent electric rice cooker control system and method |
| CN105785846A (en) * | 2014-12-25 | 2016-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker control method |
-
2012
- 2012-12-31 CN CN2012207499407U patent/CN203153384U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104068739A (en) * | 2014-06-20 | 2014-10-01 | 郭裴哲 | Intelligent electric rice cooker control system and method |
| CN105785846A (en) * | 2014-12-25 | 2016-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker control method |
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