CN103973174A - Coil driving circuit - Google Patents
Coil driving circuit Download PDFInfo
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- CN103973174A CN103973174A CN201310039729.5A CN201310039729A CN103973174A CN 103973174 A CN103973174 A CN 103973174A CN 201310039729 A CN201310039729 A CN 201310039729A CN 103973174 A CN103973174 A CN 103973174A
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- electric crystal
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Abstract
A coil driving circuit comprises a first driving unit, a coil unit, a second driving unit, a third driving unit, a fourth driving unit, a first protecting unit and a second protecting unit, wherein the first driving unit, the second driving unit, the third driving unit and the fourth driving unit receive control signals of a control unit; and when signals of a coil driving loop are abnormal, a short-circuiting phenomenon can be prevented by using the first protecting unit and the second protecting unit, and the problem that a transistor is damaged due to over-high current caused by abnormal signals can be solved.
Description
Technical field
The invention relates to that a kind of short circuit prevents circuit, espespecially a kind of coil driver that is applied to motor coil.
Background technology
Press, in recent years along with the development of electronic industry, the performance of electronic component promotes rapidly, calculation process speed is more and more faster, and the arithmetic speed of its internal wafer group constantly promotes, number of wafers also constantly increases, and the also corresponding increase of heat that aforementioned wafer distributes in the time of work, if these heats are not distributed immediately, to greatly affect the performance of electronic component, make the calculation process Speed Reduction of electronic component, and along with the continuous accumulation of heat, also may burn electronic component, therefore heat radiation has become one of important topic of electronic component.
In heat abstractor, taking radiator fan as example, because the heat that radiator fan can absorb radiating fin group is got rid of fast, to make heat radiation circulating effect good, therefore radiator fan has become one of indispensable spare part.
And aforementioned radiator fan is mainly to utilize motor driving to make its running; Generally speaking, DC Brushless Motor (Brushless dc motors, be called for short BLDC) due to good maintenance, controlled good and performance and efficiency excellence, become already the favorite of industrial quarters, wherein low power application is as the motor of Hard Disk Drive and CD-ROM device inside, powerful application is as the motor apparatus of electric motor car, can utilize DC Brushless Motor to obtain the characteristic of high efficiency, stabilization of speed, high torsion, durable, easy maintenance.
Motor be mainly utilize electric current pass through to drive its coil, the type of drive of its coil is to be produced and controlled signal to electric crystal by the control wafer on corresponding circuit board, refer to shown in the 1st figure, for the circuit diagram in current coil drive loop 1, when wherein this contact A and contact D are high potential simultaneously, the first electric crystal Q1 conducting of its correspondence, and then also conducting and its current direction flow to coil (Coil) by the second electric crystal Q2 to make its second electric crystal Q2, flow to the 6th electric crystal Q6 by coil again and complete correct current flowing direction by coil and then drive coil, when again or wherein this contact B and contact C are high potential simultaneously, the 3rd electric crystal Q3 conducting of its correspondence, and then make its 4th electric crystal Q4 also conducting and its current direction flow to coil by the 4th electric crystal Q4, then flow to the 5th electric crystal Q5 by coil and complete correct current flowing direction by coil and then drive coil.
But when the control wafer on circuit board produces abnormal conditions, it is high potential that the control signal that it produces will make its contact A and contact C simultaneously, and its current direction will be flowed directly to the 5th electric crystal Q5 by the second electric crystal Q2, it is equivalent to input and earth point direct short-circuit, and then causes the phenomenon that the second electric crystal Q2 and the 5th electric crystal Q5 damage because electric current is excessive to produce; Again or its contact B and contact D be high potential simultaneously, and its current direction will be flowed directly to the 6th electric crystal Q6 by the 4th electric crystal Q4, it is equivalent to input and earth point direct short-circuit, and then causes the phenomenon that the 4th electric crystal Q4 and the 6th electric crystal Q6 damage because electric current is excessive produce and cause the disappearance that increases cost.
Therefore, how to solve above-mentioned public problem and disappearance, the inventor who is this case desires most ardently to the relevant manufacturer that is engaged in the industry the direction place that research improves.
Summary of the invention
For this reason, for effectively solving the above problems, main purpose of the present invention is providing a kind of coil driver that can avoid signal extremely to cause electric crystal damage that has.
Another object of the present invention is that a kind of cost and coil driver simple in structure saved is being provided.
For reaching above-mentioned purpose; the invention provides a kind of coil driver; comprise one first driver element, a coil unit, one second driver element, one the 3rd driver element, 4 wheel driven moving cell, one first protected location and one second protected location, described first, second, third and fourth driver element respectively has a first input end, the second input, the 3rd input and four-input terminal.
And this first driver element and the second driver element have respectively one first electric crystal and one second electric crystal and one the 3rd electric crystal and one the 4th electric crystal, wherein this first electric crystal connects described first input end and the second electric crystal, the 3rd electric crystal connects described the second input and the 4th electric crystal, and this second electric crystal and the 4th electric crystal are connected to respectively the two ends of coil unit.
Described the 3rd driver element and 4 wheel driven moving cell have respectively interconnective 1 the 3rd input and one the 5th electric crystal and a four-input terminal and one the 6th electric crystal, another the first link and the second electric crystal that connects described coil unit of the 5th electric crystal, and another the second link and the 4th electric crystal that connects described coil unit of this 6th electric crystal.
Described the first protected location and the second protected location have respectively one first switch element and one first impedance component and a second switch element and one second impedance component, this first switch element connects described first group of anti-element and the first electric crystal, and this second switch element connects described second group of anti-element and the 3rd electric crystal; When described coil drive loop signal is abnormal by this, can prevents that short circuit phenomenon from producing via described the first protected location and the second protected location, and then can avoid the effect of electric crystal because of the abnormal current generated excessive damage of signal.
Brief description of the drawings
Fig. 1 is known circuit diagram;
Fig. 2 is the block schematic diagram of preferred embodiment of the present invention;
Fig. 3 is another block schematic diagram of preferred embodiment of the present invention;
Fig. 4 is the circuit diagram of preferred embodiment of the present invention.
Coil driver 2
The first driver element 21
First input end 211
The first electric crystal Q1
The second electric crystal Q2
The 3rd electric crystal Q3
The 4th electric crystal Q4
The 5th electric crystal Q5
The 6th electric crystal Q6
The first resistance R 1
The second resistance R 2
The 3rd resistance R 3
The 4th resistance R 4
The 5th resistance R 5
The 6th resistance R 6
The 7th resistance R 7
The 8th resistance R 8
The 9th resistance R 9
The tenth resistance R 10
The first capacitor C 1
The second capacitor C 2
Coil unit 22
The first link 221
The second link 222
The second driver element 23
The second input 231
The 3rd driver element 24
The 3rd input 241
4 wheel driven moving cell 25
Four-input terminal 251
The first protected location 26
The first switch element 261
First end 2611,2711
The second end 2612,2712
The 3rd end 2613,2713
The first impedance component 262
The second protected location 27
Second switch element 271
The second impedance component 272
Input voltage VIN
Control unit 3
Embodiment
Characteristic in above-mentioned purpose of the present invention and structure thereof and function, will be explained according to appended graphic preferred embodiment.
The invention provides a kind of coil driver, shown in Fig. 2 and Fig. 3, block schematic diagram and another block schematic diagram that shows preferred embodiment of the present invention, wherein said coil driver 2 includes one first driver element 21, one coil unit 22, one second driver element 23, one the 3rd driver element 24, 4 wheel driven moving cell 25, one first protected location 26 and one second protected location 27, and this coil driver 2 is electrically connected with a control unit 3, this control unit 3 produces has the signal of control to described first, two, three, 4 wheel driven moving cell 21, 22, 23, 24.
Wherein said the first driver element 21 has a first input end 211 and one first electric crystal Q1 and one second electric crystal Q2, this first input end 211 connects this first electric crystal Q1, and described the second electric crystal Q2 of the another connection of this first electric crystal Q1, and this coil unit 22 has one first link 221 and the second link 222, this first link 221 connects described the second electric crystal Q2, be connected to described the second driver element 23 with the second link 222, this second driver element 23 has one second input 231 and one the 3rd electric crystal Q3 and one the 4th electric crystal Q4, this second input 231 connects the 3rd electric crystal Q3, and described the 4th electric crystal Q4 of the another connection of the 3rd electric crystal Q3, the 4th electric crystal Q4 connects described the second link 222.
And the 3rd driver element 24 has interconnective 1 the 3rd input 241 and one the 5th electric crystal Q5, another the first link 221 and the second electric crystal Q2 that connects described coil unit 22 of the 5th electric crystal Q5, and this 4 wheel driven moving cell 25 has an interconnective four-input terminal 251 and one the 6th electric crystal Q6, another the second link 222 and the 4th electric crystal Q4 that connects described coil unit 22 of the 6th electric crystal Q6.
Wherein said the first protected location 26 has one first switch element 261 and one first impedance component 262, this first switch element 261 has a first end 2611, one second end 2612 and one the 3rd end 2613, this first impedance component 262 connects the first end 2611 of described the 3rd input 241 and this first switch element 261, and connecting the emitter-base bandgap grading of described the first electric crystal Q1 and the 3rd end 2613 and the first electric crystal Q1, the second end 2612 of this first switch element 261 and the 3rd end 2613 carry out ground connection, and this second protected location 27 has a second switch element 271 and one second impedance component 272, this second switch element 271 has a first end 2711, one second end 2712 and one the 3rd end 2713, this the second impedance component 272 connects the first end 2711 of described four-input terminal 251 and this second switch element 271, and connecting the emitter-base bandgap grading of described the 3rd electric crystal Q3 and the 3rd end 2713 and the 3rd electric crystal Q3, the second end 2712 of this second switch element 271 and the 3rd end 2713 carry out ground connection.
Wherein said in the present embodiment its first electric crystal Q1, the 3rd electric crystal Q3, the first switch element 261 and second switch element 271 are bipolarity junction electric crystal (bipolar iunction transistor, BJT), and this second electric crystal Q2, the 4th electric crystal Q4, the 5th electric crystal Q5 and the 6th electric crystal Q6 are an effect electric crystal (field effect transistor, FET), and in the present embodiment its first, two switch elements 261, 271 first end 2611, 2711 is base stages, its second end 2612, 2712 is collectors, its the 3rd end 2613, 2713 is emitter-base bandgap gradings.
Continuous consulting shown in Fig. 4, it is the circuit diagram that shows preferred embodiment of the present invention, and be aided with and consult the 2nd, 3 diagrams, wherein said the first driver element 21 also has one first resistance R 1, one second resistance R 2 and one the 3rd resistance R 3 and one first capacitor C 1, this the first resistance R 1 one end connects described first input end 211, and the other end connects the base stage of described the first electric crystal Q1 and the second end 2612 of the first switch element 261, these the second resistance R 2 one end connect the collector of described the first electric crystal Q1, and the other end connects the gate of described the 3rd resistance R 3 and first capacitor C 1 one end and the second electric crystal Q2, the 3rd resistance R 3 and first capacitor C 1 other end interconnect and connect source electrode and an input voltage VIN of the second electric crystal Q2, and the source electrode of this second electric crystal Q2 connects described input voltage VIN simultaneously.
And this second driver element 23 has more one the 4th resistance R 4, one the 5th resistance R 5 and one the 6th resistance R 6 and one second capacitor C 2, the 4th resistance R 4 one end connect described the second input 231, and the other end connects the base stage of described the 3rd electric crystal Q3 and the second end 2712 of second switch element 271, the 5th resistance R 5 one end connect the collector of described the 3rd electric crystal Q3, and the other end connects the gate of described the 6th resistance R 6 and second capacitor C 2 one end and the 4th electric crystal Q4, the 6th resistance R 6 and second capacitor C 2 other ends interconnect and connect source electrode and the described input voltage VIN of the 4th electric crystal Q4, and the source electrode of the 4th electric crystal Q4 connects described input voltage VIN simultaneously.
And the 3rd driver element 24 also has one the 7th resistance R 7 and one the 8th resistance R 8, the 7th resistance R 7 one end are connected to the 3rd input 241 and first impedance component 262 one end, and the other end is connected to the gate of the 8th resistance R 8 one end and the 5th electric crystal Q5, ground connection is carried out in the 8th resistance R 8 other ends connections, another this 4 wheel driven moving cell 25 also has one the 9th resistance R 9 and 1 the tenth resistance R 10, the 9th resistance R 9 one end are connected to four-input terminal 251 and second impedance component 272 one end, and the other end is connected to the gate of the tenth resistance R 10 one end and the 6th electric crystal Q6, the collector of ground connection and the 5th electric crystal Q5 is carried out in the tenth resistance R 10 other ends connections and the collector of the 6th electric crystal Q6 is also carried out ground connection.
Therefore, the control signal that described control unit 3 can produce promising high potential in the situation of normal operation is to first input end 211 and four-input terminal 251, and its first input end 211 and four-input terminal 251 are while being high potential, the first electric crystal Q1 of described the first driver element 21, the state that the 6th electric crystal Q6 of the second electric crystal Q2 and 4 wheel driven moving cell 25 is conducting, its current direction is for to flow to the second electric crystal Q2 by input voltage VIN, flow to coil unit 22 by the second electric crystal Q2 again, after flowing to the 6th electric crystal Q6 after coil unit 22, carry out ground connection, again or described control unit 3 in the situation of normal operation, can produce control signal to the second input 231 and the 3rd input 241 of promising high potential, and its second input 231 and the 3rd input 241 are while being high potential, the 3rd electric crystal Q3 of described the second driver element 23, the state that the 5th electric crystal Q5 of the 4th electric crystal Q4 and the 3rd driver element 24 is conducting, its current direction is by input voltage V1N the 4th electric crystal Q4, flow to coil unit 22 by the 4th electric crystal Q4 again, after flowing to the 5th electric crystal Q5 after coil unit 22, carry out ground connection, and then it is normal by the object of electric current to complete coil unit 22.
Otherwise, if the control signal that described control unit 3 can produce promising high potential in the situation of abnormal operation is to first input end 211 and the 3rd input 241, and its first input end 211 and the 3rd input 241 are while being high potential, the first electric crystal Q1 of described the first driver element 21, the state that the second electric crystal Q2 is conducting, its the 3rd input 241 is the first switch element 261 of the first protected location 26 be communicated to the ground connection place of the emitter-base bandgap grading position of the first electric crystal Q1 via the first switch element 261 described in conducting, to avoid its first electric crystal Q1 and the 5th electric crystal Q5 to present conducting simultaneously, and then prevent that its current direction is flowed directly to by the second electric crystal Q2 the phenomenon that the 5th electric crystal Q5 forms short circuit and produces, to reach effect person who avoids extremely causing because of signal electric crystal damage, again or when described control unit 3 can produce control signal to the second input 231 of promising high potential and four-input terminal 251 in the situation of abnormal operation, the 3rd electric crystal Q3 of described the second driver element 23, the state that the 4th electric crystal Q4 is conducting, its four-input terminal 251 is the second switch element 271 of the second protected location 27 be communicated to the ground connection place of the emitter-base bandgap grading position of the 3rd electric crystal Q3 via second switch element 271 described in conducting, to avoid its 4th electric crystal Q4 and the 6th electric crystal Q6 to present conducting simultaneously, and then prevent that its current direction is flowed directly to by the 4th electric crystal Q4 the phenomenon that the 6th electric crystal Q6 forms short circuit and produces, to reach effect person who avoids extremely causing because of signal electric crystal damage.
The above; the second switch element 271 of the first switch element 261, the first impedance component 262 and the second protected location 27 by the first protected location 26 of the present invention, the second impedance component 272 are installed in the design on coil drive loop in conjunction with application; the effect of electric crystal damage be can effectively avoid extremely causing because of signal, and then saving cost and effect simple in structure more effectively reached.
In sum, the present invention has following advantages compared to known technology:
1. can effectively avoid extremely causing electric crystal damage because of signal;
2. save cost and effect simple in structure.
Only the above, be only better feasible embodiment of the present invention, and the variation that above-mentioned method, shape, structure, the device of all the present invention of utilization done, all should be contained in the interest field of this case.
Claims (11)
1. a coil driver, is characterized in that, comprising:
One first driver element, has a first input end and one first electric crystal and one second electric crystal, and this first input end connects this first electric crystal, and described the second electric crystal of the another connection of this first electric crystal;
One coil unit, have one first link and one second link, and this first link connects described the second electric crystal;
One second driver element, has one second input and one the 3rd electric crystal and one the 4th electric crystal, and this second input connects the 3rd electric crystal, and described the 4th electric crystal of the another connection of the 3rd electric crystal, the 4th electric crystal connects described the second link;
One the 3rd driver element, has interconnective 1 the 3rd input and one the 5th electric crystal, another the first link and the second electric crystal that connects described coil unit of the 5th electric crystal;
One 4 wheel driven moving cell, has an interconnective four-input terminal and one the 6th electric crystal, another the second link and the 4th electric crystal that connects described coil unit of the 6th electric crystal;
One first protected location, there is one first switch element and one first impedance component, this first switch element has a first end, one second end and one the 3rd end, this first impedance component connects the first end of described the 3rd input and this first switch element, and the second end of this first switch element and the 3rd end connect described the first electric crystal; And
One second protected location; there is a second switch element and one second impedance component; this second switch element has a first end, one second end and one the 3rd end; this the second impedance component connects the first end of described four-input terminal and this second switch element, and the second end of this second switch element and the 3rd end connect described the 3rd electric crystal.
2. coil driver as claimed in claim 1, is characterized in that, described coil driver is electrically connected with a control unit, and this control unit output control signal is to described first, second, third and fourth driver element.
3. coil driver as claimed in claim 1, is characterized in that, the first end of described the first switch element is a base stage, and its second end is a collector, and its 3rd end is an emitter-base bandgap grading.
4. coil driver as claimed in claim 3, is characterized in that, the first end of described second switch element is a base stage, and its second end is a collector, and its 3rd end is an emitter-base bandgap grading.
5. coil driver as claimed in claim 4, is characterized in that, described the first switch element and second switch element are bipolarity junction electric crystal.
6. coil driver as claimed in claim 1, it is characterized in that, described the first driver element also has one first resistance, one second resistance and one the 3rd resistance and one first electric capacity, this the first resistance one end connects described first input end, and the other end connects the base stage of described the first electric crystal and the second end of the first switch element, this the second resistance one end connects the collector of described the first electric crystal, and the other end connects the gate of described the 3rd resistance and first electric capacity one end and the second electric crystal, the 3rd resistance and the first electric capacity other end interconnect and connect the source electrode of the second electric crystal.
7. coil driver as claimed in claim 6, it is characterized in that, described the second driver element also has one the 4th resistance, one the 5th resistance and the one or six resistance and one second electric capacity, the 4th resistance one end connects described the second input, and the other end connects the base stage of described the 3rd electric crystal and the second end of second switch element, the 5th resistance one end connects the collector of described the 3rd electric crystal, and the other end connects the gate of described the 6th resistance and second electric capacity one end and the 4th electric crystal, the 6th resistance and the second electric capacity other end interconnect and connect the source electrode of the 4th electric crystal.
8. coil driver as claimed in claim 1, it is characterized in that, described the 3rd driver element also has one the 7th resistance and one the 8th resistance, the 7th resistance one end is connected to the 3rd input and first impedance component one end, and the other end is connected to the gate of the 8th resistance one end and the 5th electric crystal.
9. coil driver as claimed in claim 8, it is characterized in that, described 4 wheel driven moving cell has one the 9th resistance and 1 the tenth resistance, and the 9th resistance one end is connected to four-input terminal and second impedance component one end, and the other end is connected to the gate of the tenth resistance one end and the 6th electric crystal.
10. coil driver as claimed in claim 1, is characterized in that, described the first electric crystal, the 3rd electric crystal are bipolarity junction electric crystal.
11. coil drivers as claimed in claim 1, is characterized in that, described the second electric crystal, the 4th electric crystal, the 5th electric crystal and the 6th electric crystal are an effect electric crystal.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200562885U CN203057047U (en) | 2013-01-31 | 2013-01-31 | Coil drive circuit |
| CN201310039729.5A CN103973174A (en) | 2013-01-31 | 2013-01-31 | Coil driving circuit |
| TW102202066U TWM463004U (en) | 2013-01-31 | 2013-01-31 | Coil driving circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200562885U CN203057047U (en) | 2013-01-31 | 2013-01-31 | Coil drive circuit |
| CN201310039729.5A CN103973174A (en) | 2013-01-31 | 2013-01-31 | Coil driving circuit |
| TW102202066U TWM463004U (en) | 2013-01-31 | 2013-01-31 | Coil driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103973174A true CN103973174A (en) | 2014-08-06 |
Family
ID=54365876
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310039729.5A Pending CN103973174A (en) | 2013-01-31 | 2013-01-31 | Coil driving circuit |
| CN2013200562885U Expired - Fee Related CN203057047U (en) | 2013-01-31 | 2013-01-31 | Coil drive circuit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200562885U Expired - Fee Related CN203057047U (en) | 2013-01-31 | 2013-01-31 | Coil drive circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN103973174A (en) |
| TW (1) | TWM463004U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650016A (en) * | 2014-11-21 | 2016-06-08 | 奇鋐科技股份有限公司 | Circuit for outage brake of DC fan |
| CN105987412A (en) * | 2015-02-05 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device, control circuit of electric cooking device and cooking method of electric cooking device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM463004U (en) * | 2013-01-31 | 2013-10-01 | Asia Vital Components Co Ltd | Coil driving circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4136368B2 (en) * | 2001-12-20 | 2008-08-20 | 富士電機機器制御株式会社 | DC brushless motor parallel drive circuit |
| TW200919916A (en) * | 2007-10-19 | 2009-05-01 | Inventec Corp | Voltage converter for avoiding breakdown of synchronous rectifier circuit |
| CN201307840Y (en) * | 2008-10-08 | 2009-09-09 | 潘亚君 | Electric motor controller of screw mandrel drive mechanism |
| CN203057047U (en) * | 2013-01-31 | 2013-07-10 | 奇鋐科技股份有限公司 | Coil drive circuit |
-
2013
- 2013-01-31 TW TW102202066U patent/TWM463004U/en not_active IP Right Cessation
- 2013-01-31 CN CN201310039729.5A patent/CN103973174A/en active Pending
- 2013-01-31 CN CN2013200562885U patent/CN203057047U/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4136368B2 (en) * | 2001-12-20 | 2008-08-20 | 富士電機機器制御株式会社 | DC brushless motor parallel drive circuit |
| TW200919916A (en) * | 2007-10-19 | 2009-05-01 | Inventec Corp | Voltage converter for avoiding breakdown of synchronous rectifier circuit |
| CN201307840Y (en) * | 2008-10-08 | 2009-09-09 | 潘亚君 | Electric motor controller of screw mandrel drive mechanism |
| CN203057047U (en) * | 2013-01-31 | 2013-07-10 | 奇鋐科技股份有限公司 | Coil drive circuit |
Non-Patent Citations (1)
| Title |
|---|
| DONGH821: "H桥驱动马达设计", 《中国电子网技术论坛》, 13 November 2008 (2008-11-13) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650016A (en) * | 2014-11-21 | 2016-06-08 | 奇鋐科技股份有限公司 | Circuit for outage brake of DC fan |
| CN105987412A (en) * | 2015-02-05 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device, control circuit of electric cooking device and cooking method of electric cooking device |
| CN105987412B (en) * | 2015-02-05 | 2017-12-12 | 佛山市顺德区美的电热电器制造有限公司 | The cooking methods of electric cooking pot and its control circuit and electric cooking pot |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM463004U (en) | 2013-10-01 |
| CN203057047U (en) | 2013-07-10 |
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Application publication date: 20140806 |