CN102222966A - Uninterrupted power supply - Google Patents
Uninterrupted power supply Download PDFInfo
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- CN102222966A CN102222966A CN2011101783611A CN201110178361A CN102222966A CN 102222966 A CN102222966 A CN 102222966A CN 2011101783611 A CN2011101783611 A CN 2011101783611A CN 201110178361 A CN201110178361 A CN 201110178361A CN 102222966 A CN102222966 A CN 102222966A
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Abstract
The invention provides an uninterrupted power supply, comprising an AC (alternating current)/DC (direct current) inverter, an isolated AC/DC inverter, an accumulator device, a DC/DC inverter, an inverter and a switch device, wherein the AC/DC inverter and the isolated AC/DC inverter are connected with the commercial electricity; the accumulator device is connected with the isolated AC/DC inverter; the DC/DC inverter is connected with the isolated AC/DC inverter and the accumulator device respectively; and the inverter is connected with the AC/DC inverter and the DC/DC inverter respectively. The switch device is connected with the inverter and the commercial electricity respectively. In the invention, the uninterrupted power supply adopts a commercial electricity voltage compensation mode, can be used in the commercial electricity situation with large voltage fluctuation, and has the advantages of simple structure, low cost, high whole efficiency and safe use.
Description
Technical field
The present invention relates to the converters technical field, particularly a kind of uninterrupted power supply.
Background technology
Uninterrupted power supply (Uniterruptible Power Supply UPS) is a kind of AC power supply, its can be when civil power be undesired moment provide stable alternating current for load.
See also Fig. 6, it is existing a kind of UPS structure chart, when civil power is just often only directly linked output through relay 45 with civil power by filter 44, use for the load that is connected the UPS output, when civil power is undesired (overtension or low excessively etc.), the battery 41 that UPS is inner with it, convert high direct voltage to through DC-DC converter 42 (DC/DC converter) earlier, utilize inverter 43 converting direct-current voltage into alternating-current voltage that this is high to switch output through relay 45 more again.
But this UPS of Fig. 6 can only be used in the less place of mains fluctuation scope, and the output of its alternating voltage is a kind of square wave form, and for inductive load (as transformer, motor), the output of this kind square wave will cause load to damage easily.
See also Fig. 7, it is existing another kind of UPS structure chart, when civil power just often, civil power input is switched through Industrial Frequency Transformers 53 through relay 52 and is directly exported through behind the filter 51, when line voltage low excessively, via the tapping of relay 52 switching Industrial Frequency Transformers 53, improve voltage output, when having a power failure, the battery 55 that UPS is inner with it produces alternating voltage output through inverter 54 and Industrial Frequency Transformer 53.
But, this UPS of Fig. 7, its alternating voltage output also is a kind of square wave form, equally easily inductive load is caused damage, and, it adopts relay 52 directly to switch Industrial Frequency Transformer 53 tappings, can produce sharp wave voltage influence power supply quality during switching, and the adjuster online at any time loss power of this line voltage.
See also Fig. 8, it is existing another kind of UPS structure chart, when civil power just often is converted to DC power supply behind the civil power process full-wave rectifying circuit 61, is to stablize alternating voltage through inverter 63 inversions again, through change over switch 64 outputs.When having a power failure, provide direct current for inverter 63 continued powers by cell apparatus 62.
Though this UPS of Fig. 8 can sine wave output, it can't be useful in the bigger place of mains fluctuation scope, and its inverter 63 used four switching tubes, thereby causes the power consumption in the use bigger, causes overall efficiency low, the cost height.
In sum, the existing UPS problem that has that power consumption is big, cost is high, can not use in the big occasion of mains fluctuation.
Summary of the invention
The purpose of this invention is to provide a kind of uninterrupted power supply, the problem that existing uninterrupted power supply power consumption is big, cost is high to solve, can not use in the big occasion of mains fluctuation.
The present invention proposes a kind of uninterrupted power supply, comprises the ac/dc converter, isolates ac/dc converter, accumulator plant, DC to DC converter, inverter and switching device.The ac/dc converter links to each other with civil power, is used for civil power is carried out rectification, and the sine voltage of output two-way positive-negative half-cycle.Isolate the ac/dc converter and link to each other, be used for the line voltage isolation rectification is become direct voltage, so that the energy of line voltage compensation to be provided with civil power.Accumulator plant links to each other with isolation ac/dc converter, is used for stored energy source and direct voltage is provided.DC to DC converter links to each other with accumulator plant with isolation ac/dc converter respectively, the direct voltage that is used for isolating the output of ac/dc converter is converted to the dc high voltage as the harmonic wave shape of city's electronic compensating, and perhaps the direct voltage of accumulator plant output being boosted is sinusoidal pulse wave width modulation voltage.Inverter links to each other with ac/dc converter and DC to DC converter respectively, is used for the voltage transitions of ac/dc converter and DC to DC converter output is become to exchange sine voltage output.Switching device links to each other with inverter and civil power respectively, is used to switch the control of supply of electric power in civil power output or DC-to-AC converter output.
According to the described uninterrupted power supply of preferred embodiment of the present invention, DC to DC converter comprises first switching tube, second switch pipe, transformer and full-wave rectifying circuit.Transformer is made of the first former limit winding, the second former limit winding, the first secondary winding, the second secondary winding.Full-wave rectifying circuit is made up of first diode, second diode, the 3rd diode and the 4th diode.The end of the same name of the different name end of the first former limit winding and the second former limit winding is connected the forward input, the end of the same name of the first former limit winding links to each other with an end of first switching tube, the different name end of the second former limit winding links to each other with an end of second switch pipe, the other end of first switching tube and second switch pipe is connected to reverse input, the end of the same name of the different name end of the first secondary winding and the second secondary winding is connected to zero line, the end of the same name of the first secondary winding links to each other with the negative pole anodal and second diode of first diode, the different name end of the second secondary winding links to each other with the negative pole anodal and the 4th diode of the 3rd diode, the negative pole of first diode and the 3rd diode is connected forward output, and the positive pole of second diode and the 4th diode is connected to reverse output.
According to the described uninterrupted power supply of preferred embodiment of the present invention, the ac/dc converter comprises the 5th diode, the 6th diode, first electric capacity and second electric capacity.The negative pole of anodal and the 6th diode of the 5th diode connects live wire, the negative pole of the 5th diode links to each other with an end of first electric capacity, and connection forward output, the positive pole of the 6th diode links to each other with an end of second electric capacity, and connecting oppositely output, first electric capacity is connected zero line with the other end of second electric capacity.
According to the described uninterrupted power supply of preferred embodiment of the present invention, isolate the ac/dc converter and comprise Industrial Frequency Transformer, full-wave rectifying circuit and the 3rd electric capacity.Full-wave rectifying circuit is made up of the 7th diode, the 8th diode, the 9th diode and the tenth diode.The two ends of the former limit of Industrial Frequency Transformer winding link to each other with live wire and zero line respectively, one end of Industrial Frequency Transformer secondary winding is connected to the negative pole of anodal and the tenth diode of the 9th diode, the other end of Industrial Frequency Transformer secondary winding is connected to the negative pole of anodal and the 8th diode of the 7th diode, the negative pole of the 7th diode and the 9th diode links to each other with an end of the 3rd electric capacity, and export as forward, the 8th diode links to each other with the other end of the 3rd electric capacity with the positive pole of the tenth diode, and as oppositely output.
According to the described uninterrupted power supply of preferred embodiment of the present invention, inverter comprises the 3rd switching tube, the 4th switching tube, inductance and the 4th electric capacity, one end of the 3rd switching tube connects the forward input, one end of the 4th switching tube connects oppositely input, the other end of the 3rd switching tube and the 4th switching tube all links to each other with an end of inductance, the other end of inductance links to each other with an end of the 4th electric capacity, and as the output of inverter, the other end of the 4th electric capacity connects zero line.
With respect to prior art, the invention has the beneficial effects as follows:
1, the present invention has adopted the mode of line voltage compensation, have and revise the function that line voltage reaches the output voltage stabilizing, thereby uninterrupted power supply not only can be used under the situation of civil power outage, can also use in the big occasion of mains fluctuation, can effectively avoid spread of voltage infringement that subscriber equipment brought.
2, inverter of the present invention adopts low frequency commutation effective operation, in use can not produce sharp wave voltage, has guaranteed the safety of power supply quality and load.
3, uninterrupted power supply output of the present invention is the voltage of sinusoidal wave form, can not cause damage to inductive load.
4, the present invention is simple in structure, with low cost, has very high complete machine operational efficiency, and low in energy consumption, has the advantage of energy-saving and emission-reduction, the reduction electricity charge.
Description of drawings
Fig. 1 is a kind of example structure schematic diagram of uninterrupted power supply of the present invention;
Fig. 2 is a kind of embodiment circuit diagram of ac/dc converter of the present invention;
Fig. 3 isolates a kind of embodiment circuit diagram of ac/dc converter for the present invention;
Fig. 4 is a kind of embodiment circuit diagram of DC to DC converter for the present invention;
Fig. 5 is a kind of embodiment circuit diagram of inverter for the present invention;
Fig. 6 is first kind of existing UPS structure chart;
Fig. 7 is second kind of existing UPS structure chart;
Fig. 8 is the third existing UPS structure chart.
Embodiment
Main thought of the present invention is the mode that has adopted the line voltage compensation, revises the function that line voltage reaches the output voltage stabilizing, thereby uninterrupted power supply not only can be used under the situation of civil power outage, can also use in the big occasion of mains fluctuation.
Below in conjunction with accompanying drawing, specify the present invention.
See also Fig. 1, it is a kind of example structure schematic diagram of uninterrupted power supply of the present invention, and it comprises ac/dc converter 11, isolates ac/dc converter 12, accumulator plant 13, DC to DC converter 14, inverter 15 and switching device 16.Ac/dc converter 11 links to each other with civil power, and exports positive negative zero three tunnel outputs.Isolate ac/dc converter 12 and link to each other, and export positive and negative two-way output with civil power.Accumulator plant 13 links to each other with isolation ac/dc converter 12.DC to DC converter 14 links to each other with accumulator plant 13 with isolation ac/dc converter 12 respectively, positive negative zero three tunnel outputs of its output and the common input as inverter 15 of three tunnel outputs of ac/dc converter 11.Switching device 16 links to each other with inverter 15 and civil power respectively.
Civil power just often, switching device 16 switches and is communicated with civil powers, make civil power through switching device 16 directly output supply with subscriber equipmenies and use.
Line voltage is crossed when low or too high, and switching device 16 will forbid that civil power directly exports power supply and give subscriber equipment, and inverter 15 and output are supplied with subscriber equipment as AC power.At this moment, civil power is rectified into the sinewave output of positive-negative half-cycle to inverter 15 via ac/dc converter 11.Civil power also is filtered into direct voltage after isolating 12 full-wave rectifications of ac/dc converter in addition, after converting direct voltage to higher harmonics compensation correction voltage through DC to DC converter 14 then, together be input to inverter 15 with the sine wave of ac/dc converter 11 outputs, after the two-way voltage of DC to DC converter 14 and 11 outputs of ac/dc converter synthesizes specified civil power sine voltage waveform, supply with subscriber equipment by obtaining stable AC power after the inverter 15 power frequency commutation filtering.Therefore, under the bigger situation of mains fluctuation scope, can revise the voltage of exporting to subscriber equipment, and then reach the effect of voltage stabilizing, also effectively avoid spread of voltage infringement that subscriber equipment brought by uninterrupted power supply of the present invention.
When mains failure, provide the energy by accumulator plant 13, the direct current of its output is through DC to DC converter 14, adopt sinusoidal pulse wave width modulation technology, be sinusoidal pulse wave width modulation voltage waveform with boosting after the direct voltage isolation, be converted to stable alternating voltage output for inverter 15 power frequency commutations, subscriber equipment is given in power supply.
Each parts to uninterrupted power supply among Fig. 1 are elaborated below.
See also Fig. 2, it is a kind of embodiment circuit diagram of ac/dc converter 11, and it comprises the 5th diode 111, the 6th diode 112, first electric capacity 113 and second electric capacity 114.The negative pole of anodal and the 6th diode 112 of the 5th diode 111 connects live wire, the negative pole of the 5th diode 111 links to each other with an end of first electric capacity 113, and connection forward output, the positive pole of the 6th diode 112 links to each other with an end of second electric capacity 114, and connecting oppositely output, the other end of first electric capacity 113 and second electric capacity 114 is connected zero line.
After the half-bridge rectification of civil power via the 5th diode 111 and the 6th diode 112 compositions, through first electric capacity 113 and second electric capacity, 114 filtering high-frequency harmonics, output plus terminal is the sinusoidal wave power-frequency voltage of positive half cycle, the output negative terminal is the sinusoidal wave power-frequency voltage of negative half period, and output zero end is city's electrical neutral axis.
See also Fig. 3, it is for isolating a kind of embodiment circuit diagram of ac/dc converter 12, and it comprises Industrial Frequency Transformer 121, forms full-wave rectifying circuit and the 3rd electric capacity 123 by the 7th diode 124, the 8th diode 125, the 9th diode 122 and the tenth diode 126.The two ends of Industrial Frequency Transformer 121 former limit windings link to each other with live wire and zero line respectively, one end of Industrial Frequency Transformer 121 secondary windings is connected to the negative pole of anodal and the tenth diode 126 of the 9th diode 122, the other end of Industrial Frequency Transformer secondary winding is connected to the negative pole of anodal and the 8th diode 125 of the 7th diode 124, the negative pole of the 7th diode 124 and the 9th diode 122 links to each other with an end of the 3rd electric capacity 123, and the 8th diode 125 links to each other with the other end of the 3rd electric capacity 123 with the positive pole of the tenth diode 126.
Civil power is behind Industrial Frequency Transformer 121 isolated bucks, and the full-wave rectifying circuit rectification of forming through four diodes is a direct voltage, is filtered into direct voltage output through the 3rd electric capacity 123 again.
See also Fig. 4, it is a kind of embodiment circuit diagram of DC to DC converter 14, and it comprises the 5th electric capacity 141, first switching tube 142, second switch pipe 143, transformer 145 and forms full-wave rectifying circuit by first diode 147, second diode 148, the 3rd diode 146 and the 4th diode 149.The 5th electric capacity 141 is connected between two inputs.Transformer 145 is made of the first former limit winding, 1451, the second former limit winding 1452, the first secondary winding 1453, the second secondary winding 1454.The end of the same name of the different name end of the first former limit winding 1451 and the second former limit winding 1452 is connected the forward input, the end of the same name of the first former limit winding 1451 links to each other with an end of first switching tube 142, the different name end of the second former limit winding 1452 links to each other with an end of second switch pipe 143, and the other end of first switching tube 142 and second switch pipe 143 is connected to reverse input.The end of the same name of the different name end of the first secondary winding 1453 and the second secondary winding 1454 is connected to zero line, the end of the same name of the first secondary winding 1453 links to each other with the negative pole anodal and second diode 148 of first diode 147, the different name end of the second secondary winding 1454 links to each other with the negative pole anodal and the 4th diode 149 of the 3rd diode 146, the negative pole of first diode 147 and the 3rd diode 146 is connected forward output, and the positive pole of second diode 148 and the 4th diode 149 is connected to reverse output.
Wherein, the on off state of first switching tube 142 and second switch pipe 143 can be controlled by microcontroller.When not having civil power, the input voltage of DC to DC converter 14 is provided by accumulator plant 13, the first former limit winding, the 1451 and second former limit winding 1452 of transformer 145 is formed push-pull type (Push-pull) circuit structure, control first switching tube 142 and second switch pipe 143, after adopting sinusoidal pulse wave width modulation technology that input voltage is isolated, become positive negative zero three ends output by the full-wave rectification of boosting of the first secondary winding 1453, the second secondary winding 1454 and 4 diodes, the voltage of output is sinusoidal pulse wave width modulation voltage waveform.If when having civil power and line voltage too high or too low, control first switching tube 142 and second switch pipe 143, adopt the compensation of line voltage difference to revise the harmonic voltage of output civil power and specified sine voltage difference.This shows that described DC to DC converter is the DC device of a mix operation.
See also Fig. 5, it is a kind of embodiment circuit diagram of inverter 15, and it comprises the 3rd switching tube 151, the 4th switching tube 152, inductance 153 and the 4th electric capacity 154.One end of the 3rd switching tube 151 connects the forward input, one end of the 4th switching tube 152 connects oppositely input, the other end of the 3rd switching tube 151 and the 4th switching tube 152 all links to each other with an end of inductance 153, the other end of inductance 153 links to each other with an end of the 4th electric capacity 154, and as the output of inverter, the other end of the 4th electric capacity 154 connects zero line.
During mains failure, the input voltage of inverter 15 is provided separately by DC to DC converter 14; When civil power and line voltage were too high or too low, the input of inverter 15 was to provide after the output voltage by ac/dc converter 11 and DC to DC converter 14 merges.The direct current anode is exported the positive half cycle sine voltage of power frequency behind the 3rd switching tube 151, inductance 153, the 4th electric capacity 154, return direct current zero end again; The direct current negative terminal returns direct current zero end again through the 4th switching tube 152, inductance 153, the 4th electric capacity 154 output power frequency negative half period sine voltages.This inverter 15 only is provided with two pipes that open the light, and by controlling the 3rd switching tube 151 and the 4th switching tube 152 has been realized the power frequency commutation, switching loss is extremely low, has also realized energy-saving and emission-reduction when having guaranteed overall efficiency and has reduced the electricity charge.
Uninterrupted power supply of the present invention adopts the mode of line voltage compensation, has to revise the function that line voltage reaches the output voltage stabilizing, has realized high efficiency online uninterrupted power supply.And, uninterrupted power supply of the present invention utilizes simple circuit configuration, can be used on the bigger place of mains fluctuation scope, when forming low-voltage compensation or high voltage decay, line voltage do not produce sharp wave voltage, can improve input power factor, reduce the total harmonic current of input, very high complete machine operational efficiency is arranged, realize energy-saving and emission-reduction and reduce the electricity charge.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, only otherwise exceed the described scope of appended claims, all should drop in protection scope of the present invention.
Claims (5)
1. a uninterrupted power supply is characterized in that, comprising:
One ac/dc converter links to each other with civil power, is used for civil power is carried out rectification, and the sine voltage of output two-way positive-negative half-cycle;
One isolates the ac/dc converter, links to each other with civil power, is used for the line voltage isolation rectification is become direct voltage, so that the energy of line voltage compensation to be provided;
One accumulator plant links to each other with this isolation ac/dc converter, is used for stored energy source and direct voltage is provided;
One DC to DC converter, link to each other with this accumulator plant with this isolation ac/dc converter respectively, the direct voltage that is used for isolating the output of ac/dc converter is converted to the dc high voltage as the harmonic wave shape of city's electronic compensating, and perhaps the direct voltage of this accumulator plant output being boosted is sinusoidal pulse wave width modulation voltage;
One inverter links to each other with this ac/dc converter and this DC to DC converter respectively, is used for the voltage transitions of this ac/dc converter and the output of this DC to DC converter is become to exchange sine voltage output;
One switching device links to each other with this inverter and civil power respectively, is used to switch the control of supply of electric power in civil power output or DC-to-AC converter output.
2. uninterrupted power supply as claimed in claim 1, it is characterized in that, this DC to DC converter comprises one first switching tube, one second switch pipe, by one first former limit winding, one second former limit winding, one first secondary winding, the transformer that one second secondary winding constitutes, by one first diode, one second diode, the full-wave rectifying circuit that one the 3rd diode and one the 4th diode are formed, the end of the same name of the different name end of this first former limit winding and this second former limit winding is connected the forward input, the end of the same name of this first former limit winding links to each other with an end of this first switching tube, the different name end of this second former limit winding links to each other with an end of this second switch pipe, the other end of this first switching tube and this second switch pipe is connected to reverse input, the end of the same name of the different name end of this first secondary winding and this second secondary winding is connected to zero line, the end of the same name of this first secondary winding links to each other with the negative pole anodal and this second diode of this first diode, the different name end of this second secondary winding links to each other with the negative pole anodal and the 4th diode of the 3rd diode, the negative pole of this first diode and the 3rd diode is connected forward output, and the positive pole of this second diode and the 4th diode is connected to reverse output.
3. uninterrupted power supply as claimed in claim 1, it is characterized in that, this ac/dc converter comprises one the 5th diode, one the 6th diode, one first electric capacity and one second electric capacity, the negative pole of anodal and the 6th diode of the 5th diode connects live wire, the negative pole of the 5th diode links to each other with an end of this first electric capacity, and connection forward output, the positive pole of the 6th diode links to each other with an end of this second electric capacity, and connecting oppositely output, the other end of this first electric capacity and this second electric capacity is connected zero line.
4. uninterrupted power supply as claimed in claim 1, it is characterized in that, this isolation ac/dc converter comprises an Industrial Frequency Transformer, by one the 7th diode, one the 8th diode, a full-wave rectifying circuit and one the 3rd electric capacity that one the 9th diode and 1 the tenth diode are formed, the two ends of the former limit of this Industrial Frequency Transformer winding link to each other with live wire and zero line respectively, one end of this Industrial Frequency Transformer secondary winding is connected to the negative pole of anodal and the tenth diode of the 9th diode, the other end of this Industrial Frequency Transformer secondary winding is connected to the negative pole of anodal and the 8th diode of the 7th diode, the negative pole of the 7th diode and the 9th diode links to each other with an end of the 3rd electric capacity, and export as forward, the 8th diode links to each other with the other end of the 3rd electric capacity with the positive pole of the tenth diode, and as oppositely output.
5. uninterrupted power supply as claimed in claim 1, it is characterized in that, this inverter comprises one the 3rd switching tube, one the 4th switching tube, an inductance and one the 4th electric capacity, one end of the 3rd switching tube connects the forward input, one end of the 4th switching tube connects oppositely input, the other end of the 3rd switching tube and the 4th switching tube all links to each other with an end of this inductance, the other end of this inductance links to each other with an end of the 4th electric capacity, and as the output of this inverter, the other end of the 4th electric capacity connects zero line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101783611A CN102222966A (en) | 2011-06-29 | 2011-06-29 | Uninterrupted power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101783611A CN102222966A (en) | 2011-06-29 | 2011-06-29 | Uninterrupted power supply |
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| CN102222966A true CN102222966A (en) | 2011-10-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101783611A Pending CN102222966A (en) | 2011-06-29 | 2011-06-29 | Uninterrupted power supply |
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| CN (1) | CN102222966A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102664414A (en) * | 2012-05-04 | 2012-09-12 | 深圳市理工新能源有限公司 | Dynamic voltage compensator |
| CN106972599A (en) * | 2017-04-14 | 2017-07-21 | 武汉中原电子集团有限公司 | A kind of novel flexible Intelligent charging station and charging method |
| CN108336814A (en) * | 2018-02-09 | 2018-07-27 | 漳州科华技术有限责任公司 | A kind of off-line UPS |
| CN110429595A (en) * | 2019-08-27 | 2019-11-08 | 广东美的厨房电器制造有限公司 | Circuit structure and household electrical appliance |
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| CN101521392A (en) * | 2008-02-28 | 2009-09-02 | 德观电子(上海)有限公司 | Off-line uninterrupted power supply device |
| US20110115295A1 (en) * | 2009-11-19 | 2011-05-19 | Chong-Sop Moon | Energy management system and grid-connected energy storage system including the energy management system |
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| CN1653670A (en) * | 2002-05-16 | 2005-08-10 | 皇家飞利浦电子股份有限公司 | Single stage power converter for contact-less energy transfer |
| CN201038795Y (en) * | 2007-01-18 | 2008-03-19 | 秦江超 | High-frequency emergency power supply unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102664414A (en) * | 2012-05-04 | 2012-09-12 | 深圳市理工新能源有限公司 | Dynamic voltage compensator |
| CN106972599A (en) * | 2017-04-14 | 2017-07-21 | 武汉中原电子集团有限公司 | A kind of novel flexible Intelligent charging station and charging method |
| CN106972599B (en) * | 2017-04-14 | 2019-10-08 | 武汉中原电子集团有限公司 | A kind of flexible intelligent charging station and charging method |
| CN108336814A (en) * | 2018-02-09 | 2018-07-27 | 漳州科华技术有限责任公司 | A kind of off-line UPS |
| CN110429595A (en) * | 2019-08-27 | 2019-11-08 | 广东美的厨房电器制造有限公司 | Circuit structure and household electrical appliance |
| CN110429595B (en) * | 2019-08-27 | 2021-02-23 | 广东美的厨房电器制造有限公司 | Circuit structure and household appliance |
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Application publication date: 20111019 |