CN103219897B - A kind of Switching Power Supply and the refrigerator with it - Google Patents
A kind of Switching Power Supply and the refrigerator with it Download PDFInfo
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- CN103219897B CN103219897B CN201310163658.XA CN201310163658A CN103219897B CN 103219897 B CN103219897 B CN 103219897B CN 201310163658 A CN201310163658 A CN 201310163658A CN 103219897 B CN103219897 B CN 103219897B
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Abstract
The invention discloses a kind of Switching Power Supply, comprising: be galvanic rectification circuit by the AC conversion of input; Filter circuit, comprise: the first inductance, the second inductance, the first electric capacity and the second electric capacity, one end of first inductance is connected with the first output of rectification circuit, one end of second inductance is connected with the second output of rectification circuit, one end of first electric capacity is connected with one end of the first inductance, the other end is connected with one end of the second inductance, and one end of the second electric capacity is connected with the other end of the first inductance, and the other end is connected with the other end of the second inductance; The first end of switch module is connected with the other end of the first inductance; For the conducting of control switch module and the ON-OFF control circuit of disconnection; The first input end of transformer is connected with the 3rd end of switch module, and the second input is connected with the other end of the second inductance.Switching Power Supply of the present invention, while meeting EMI, EMC test request, can reduce costs.The present invention proposes a kind of refrigerator simultaneously.
Description
Technical field
The present invention relates to power technique fields, particularly a kind of Switching Power Supply, and there is the refrigerator of this Switching Power Supply.
Background technology
Generally, the output voltage can observing rectification circuit from oscilloscope is not pure direct current, and differs greatly with direct current, containing larger ripple component in waveform, is called ripple.For obtaining more satisfactory direct voltage, need to utilize the filter circuit of reactive components such as electric capacity, the inductance composition with energy storage effect to carry out ripple component in filtering Output Voltage in Rectified Circuits to obtain direct voltage.Conventional filter circuit has passive filtering and the large class of active power filtering two.The principal mode of passive filtering has capacitor filtering, inductor filter and compound filtering, and wherein compound filtering can comprise inverted L shape, LC filtering, LC π type filtering and the filtering of RC π type etc.The principal mode of active power filtering is Active RC filtering, is also referred to as electronic filter.The size of the ripple component in direct current represents with ripple factor, and ripple factor is larger, then the filter effect of filter is poorer.The DC component of the first-harmonic maximum/output voltage of ripple factor (S)=output voltage alternating current component.Such as, the ripple factor of halfwave rectifier output voltage is S=1.57, and the ripple factor S ≈ of the output voltage of full-wave rectification and bridge rectifier O.67.After adopting C type filter circuit for all-wave and bridge rectifier, (4 (RLC/T-1), wherein, S is ripple factor to its ripple factor S=1/, and R is resistance value, and L is inductance, and C is electric capacity, and T is the cycle.
In addition, as shown in Figure 1,12W switching power circuit part conventional at present comprises: X structure capacitive 101, common mode inductance 102, entire filter wave current circuit 103, switch module 104, PWM controlling and driving circuits 105, transformer 106, output filtering 107, Sampling and feedback control circuit 108 and sample circuit 109, wherein sample circuit 109 comprises resistance R01 and resistance R02, R0L is load, civil power 220V/50Hz input switch power supply, the output of Switching Power Supply is that load R0L powers.Voltage after rectification generally direct electric capacity carry out filtering, when adopting electric capacity to carry out filtering, need very large capacitance just can satisfy the demands, but, there is very large short circuit current instantaneously powering up in large bulk capacitance, this electric current is to rectifier diode, the impact of transformer is very large, and existing 12W Switching Power Supply is meeting EMI(Electro-MagneticInterference, electromagnetic interference), EMC(Electro-MagneticCompatibility, Electro Magnetic Compatibility) under the requirement tested, the cost of the common mode inductance adopted and filtering large electrochemical capacitor used is higher.In order to reduce bulky capacitor at household electrical appliances instantaneously to the impact of rectifier diode and transformer, general way can add a power-type NTC(NegativeTemperatureCoefficient before rectification circuit, negative temperature coefficient) thermistor maintains balance, because of NTC thermistor, resistance is very large at normal temperatures, along with temperature raises after powering up, resistance value reduces rapidly, the effect of soft start can be played, the shortcoming of this circuit is: after power-off, in thermal time constant, NTC thermistor does not return to zero-power resistance, so be not suitable for frequent starting.In addition, when adopting LC/LT mode filter to carry out filtering, often cause circuit to produce resonance with other elements in circuit under a certain frequency owing to coming from not mating of filter terminal impedance, thus affect the normal work of circuit.
Summary of the invention
Object of the present invention is intended to solve one of above-mentioned technical problem at least to a certain extent.
For this reason, one object of the present invention is to propose a kind of Switching Power Supply, and this Switching Power Supply while meeting EMI, EMC test request, can be able to reduce costs.
Another object of the present invention is to propose a kind of refrigerator.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of Switching Power Supply, and this Switching Power Supply comprises: be galvanic rectification circuit by the AC conversion of input; Filter circuit, described filter circuit comprises: the first inductance and the second inductance, and one end of described first inductance is connected with the first output of described rectification circuit, and one end of described second inductance is connected with the second output of described rectification circuit; First electric capacity, one end of described first electric capacity is connected with one end of described first inductance, and the other end of described first electric capacity is connected with one end of described second inductance; Second electric capacity, one end of described second electric capacity is connected with the other end of described first inductance, and the other end of described second electric capacity is connected with the other end of described second inductance; Switch module, the first end of described switch module is connected with the other end of described first inductance; For the conducting of control switch module and the ON-OFF control circuit of disconnection, the first end of described ON-OFF control circuit is connected with the second end of described switch module, and the second end of described ON-OFF control circuit is connected with the other end of described second inductance; Transformer, the first input end of described transformer is connected with the 3rd end of described switch module, and the second input of described transformer is connected with the other end of described second inductance, and the first output of described transformer is the first output of described Switching Power Supply.
According to the Switching Power Supply of the embodiment of the present invention, by the filter circuit be made up of two inductance and two electric capacity, filtering is carried out to input voltage, the output demand that can meet Switching Power Supply and the requirement that EMI is detected, and do not need common mode inductance, circuit structure is more simple, reduces cost.
Further, in one embodiment of the invention, above-mentioned Switching Power Supply also comprises: X structure capacitive input AC electricity being carried out to filtering, the first input end of described X structure capacitive is connected with two inputs of alternating current respectively with the second double input end, first output of described X structure capacitive is connected with the first input end of described rectification circuit, and the second output of described X structure capacitive is connected with the second input of described rectification circuit; Output filter circuit, one end of described output filter circuit is connected with the second output of described transformer, and the second end of described output circuit is connected with the first output of described transformer; Sample circuit, the first end of described sample circuit is connected with the 3rd end of described output filter circuit, and the second end of described sample circuit is connected with the first output of described transformer; Feedback control circuit, the first end of described feedback control circuit is connected with the 3rd end of described ON-OFF control circuit, second end of described feedback control circuit is connected with the first output of described transformer, and the 3rd end of described feedback control circuit is connected with the 3rd end of described sample circuit.
Further, in one embodiment of the invention, described sample circuit comprises: the first resistance, and one end of described first resistance other end of described first resistance that is connected with the 3rd end of described output filter circuit is connected with the 3rd end of described feedback control circuit; Second resistance, one end of described second resistance is connected with the other end of described first resistance, and the other end of described second resistance is connected with the first output of described transformer; Wherein, have first node between described first resistance and described second resistance, described first node is connected with the 3rd end of described feedback control circuit.
In some embodiments of the invention, described first electric capacity and described second electric capacity can calculate acquisition according to the ripple current of the power output of described Switching Power Supply and the input of described filter circuit.
In addition, described first inductance can calculate according to the cut-off frequency of described filter circuit and obtain.
In one particular embodiment of the present invention, described switch module can be triode, the emitter of described triode is connected with the other end of described first inductance, the base stage of described triode is connected with the first end of described ON-OFF control circuit, and the collector electrode of described triode is connected with the first input end of described transformer.
For achieving the above object, another aspect of the present invention embodiment proposes a kind of refrigerator, and this refrigerator comprises the Switching Power Supply that above-described embodiment proposes.
According to the refrigerator of the embodiment of the present invention, by adopting above-mentioned Switching Power Supply, can reduce costs while meeting the requirement of refrigerator master control borad.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the block diagram of the structure of the Switching Power Supply of prior art;
Fig. 2 is the block diagram of the structure of Switching Power Supply according to the embodiment of the present invention;
Fig. 3 is the block diagram of the structure of Switching Power Supply according to an embodiment of the invention; And
Fig. 4 is the block diagram of the refrigerator according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
With reference to description below and accompanying drawing, these and other aspects of embodiments of the invention will be known.Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
The Switching Power Supply proposed according to the embodiment of the present invention and the refrigerator with this Switching Power Supply are described with reference to the accompanying drawings.
As shown in Figure 2, the Switching Power Supply of the embodiment of the present invention comprises: rectification circuit 201, filter circuit 202, switch module 203, ON-OFF control circuit 204 and transformer 205.Wherein, the AC conversion of input is direct current by rectification circuit 201.The output voltage of rectification circuit 201 is carried out filtering by filter circuit 202.
Further, filter circuit 202 comprises: the first inductance 206, second inductance 207, first electric capacity 208 and the second electric capacity 209.Wherein, one end of the first inductance 206 is connected with the first output 53 of rectification circuit 201, and one end of the second inductance 207 is connected with the second output 54 of rectification circuit 201; One end of first electric capacity 208 is connected with one end of the first inductance 206, and the other end of the first electric capacity 208 is connected with one end of the second inductance 207; One end of second electric capacity 209 is connected with the other end of the first inductance 206, and the other end of the second electric capacity 209 is connected with the other end of the second inductance 207.
As shown in Figure 2, the first end 1 of switch module 203 is connected with the other end of the first inductance 206.ON-OFF control circuit 204 is for the conducting of control switch module 203 and disconnection, and the first end 21 of ON-OFF control circuit 204 is connected with the second end 2 of switch module 203, and the second end 22 of ON-OFF control circuit 204 is connected with the other end of the second inductance 207.The first input end 31 of transformer 205 is connected with the 3rd end 3 of switch module 203, and the second input 32 of transformer 205 is connected with the other end of the second inductance 207, and the first output 33 of transformer 205 is the first output of Switching Power Supply.
Further, in one embodiment of the invention, as shown in Figure 3, above-mentioned Switching Power Supply also comprises: X structure capacitive 301, output filter circuit 302, sample circuit 303 and feedback control circuit 304.Wherein, X structure capacitive 301 pairs of input AC electricity carry out filtering, the first input end 41 of X structure capacitive 301 is connected with two inputs of alternating current respectively with the second input 42, first output 43 of X structure capacitive 301 is connected with the first input end 51 of rectification circuit 201, and the second output 44 of X structure capacitive 301 is connected with the second input 52 of rectification circuit 201.The first end 61 of output filter circuit 302 is connected with the second output 34 of transformer 205, and the second end 62 of output filter circuit 302 is connected with the first output 33 of transformer 205.The first end 71 of sample circuit 303 is connected with the 3rd end 63 of output filter circuit 302, and the second end 72 of sample circuit 303 is connected with the first output 33 of transformer 205.The first end 81 of feedback control circuit 304 is connected with the 3rd end 23 of ON-OFF control circuit 204, second end 82 of feedback control circuit 304 is connected with the first output 33 of transformer 205, and the 3rd end 83 of feedback control circuit 304 is connected with the 3rd end 73 of sample circuit 303.
Further, as shown in Figure 3, sample circuit 303 can comprise: the first resistance R1 and the second resistance R2.Wherein, one end of the first resistance R1 is connected with the 3rd end 63 of output filter circuit 302, and the other end of the first resistance R1 is connected with the 3rd end 83 of feedback control circuit 304.One end of second resistance R2 is connected with the other end of the first resistance R1, and the other end of the second resistance R2 is connected with the first output 33 of transformer 205.Wherein, have first node 9 between the first resistance R1 and the second resistance R2, first node 9 is connected with the 3rd end 83 of feedback control circuit 304.Resistance R
lfor load, the output of Switching Power Supply is resistance R
lpower supply.
In one embodiment of the invention, as shown in Figure 3, switch module 203 can be triode, can also be the device that metal-oxide-semiconductor or controllable silicon etc. can realize on-off action.Wherein, the emitter of triode is connected with the other end of the first inductance, and the base stage of triode is connected with the first end of described ON-OFF control circuit, and the collector electrode of triode is connected with the first input end of described transformer.
As shown in Figure 3, be input as the alternating current of 220v/50Hz, filtering is carried out through X structure capacitive 301, pulsating direct current is become again after rectification circuit 201 rectification, then by filter circuit 202, pulsating direct current is converted into more smooth direct current, and controls the conducting of triode by ON-OFF control circuit 204 and end to generate alternating current, alternating current carries out transformation to obtain required voltage value through transformer 205, obtaining direct voltage through output filter circuit 302 again, is load R
lpower supply, in order to make output voltage stabilization, have employed sample circuit 303 and error is carried out optical coupling amplification through feedback control circuit 304, feed back to ON-OFF control circuit 204, ON-OFF control circuit 203 controls conducting and the deadline (i.e. duty ratio) of triode by PWM, keeps stable to make the output voltage of Switching Power Supply.
Normally, in " source " or " load " of LC mode filter, end can increase a filter capacitor, to change the impedance of filter input end, namely π type filter circuit is formed, then from the noise in " source " or " load " first through low-impedance filter capacitor loop, then enter into LC type filter circuit.The filter circuit 202 of the Switching Power Supply of the embodiment of the present invention forms π type filter circuit by the first inductance 206, first electric capacity 208 and the second electric capacity 209, the noise from power supply and circuit side and harmonic signal can be suppressed simultaneously, turn increase the second inductance 207 simultaneously, EMI interference can be reduced by the second inductance 207, reach the requirement that Switching Power Supply electromagnetic interference detects.Wherein, first inductance 206 can calculate according to the cut-off frequency of filter circuit 202 and obtain, first electric capacity 208 and the second electric capacity 209 can calculate according to the ripple current of the parameter of designed Switching Power Supply as power output and filter circuit 202 input and obtain, wherein, first inductance 206, first electric capacity 208 and the second electric capacity 209 be calculated as prior art, here repeat no more.Then only need select the parameter of the Y capacitance of the second suitable inductance 207 and transformer 205, namely the EMI interference of circuit capable of inhibiting is with the requirement meeting Switching Power Supply.In addition, filter circuit 202 adopts two electric capacity and two inductance, its input and output are made to be all Low ESR, the insertion loss characteristic of filter circuit 202 is due to C type and LC type, wherein, insertion loss refers to the loss of the bearing power occurred due to the insertion of element or device at the book office of transmission system, insertion loss can be expressed as this element or device insert before power received in load with insert after the ratio of power (in units of decibel) received in same load.In an embodiment of the present invention, suitable filter circuit 202 parameter can be selected according to physical circuit, the output demand of Switching Power Supply can be realized and suppress the requirement of EMI.
In sum, according to the Switching Power Supply of the embodiment of the present invention, by the filter circuit be made up of two inductance and two electric capacity, filtering is carried out to input voltage, the output demand that can meet Switching Power Supply and the requirement that EMI is detected, and do not need common mode inductance, reduce cost.
Refrigerator according to the embodiment of the present invention is described with reference to the accompanying drawings.
As shown in Figure 4, the refrigerator 401 of the embodiment of the present invention comprises the Switching Power Supply 402 of above-described embodiment.
According to the refrigerator of the embodiment of the present invention, by adopting above-mentioned Switching Power Supply, can reduce costs while meeting the requirement of refrigerator master control borad.
Each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (6)
1. a Switching Power Supply, is characterized in that, comprising:
Input AC electricity is carried out to the X electric capacity of filtering, the first input end of described X electric capacity is connected with two inputs of alternating current respectively with the second input;
Be galvanic rectification circuit by the AC conversion of input, the first output of described X electric capacity is connected with the first input end of described rectification circuit, and the second output of described X electric capacity is connected with the second input of described rectification circuit;
Filter circuit, described filter circuit comprises:
First inductance and the second inductance, one end of described first inductance is connected with the first output of described rectification circuit, and one end of described second inductance is connected with the second output of described rectification circuit;
First electric capacity, one end of described first electric capacity is connected with one end of described first inductance, and the other end of described first electric capacity is connected with one end of described second inductance;
Second electric capacity, one end of described second electric capacity is connected with the other end of described first inductance, and the other end of described second electric capacity is connected with the other end of described second inductance;
Switch module, the first end of described switch module is connected with the other end of described first inductance;
For the conducting of control switch module and the ON-OFF control circuit of disconnection, the first end of described ON-OFF control circuit is connected with the second end of described switch module, and the second end of described ON-OFF control circuit is connected with the other end of described second inductance;
Transformer, the first input end of described transformer is connected with the 3rd end of described switch module, and the second input of described transformer is connected with the other end of described second inductance, and the first output of described transformer is the first output of described Switching Power Supply;
Output filter circuit, the first end of described output filter circuit is connected with the second output of described transformer, and the second end of described output filter circuit is connected with the first output of described transformer;
Sample circuit, the first end of described sample circuit is connected with the 3rd end of described output filter circuit, and the second end of described sample circuit is connected with the first output of described transformer;
Feedback control circuit, the first end of described feedback control circuit is connected with the 3rd end of described ON-OFF control circuit, second end of described feedback control circuit is connected with the first output of described transformer, and the 3rd end of described feedback control circuit is connected with the 3rd end of described sample circuit.
2. Switching Power Supply as claimed in claim 1, it is characterized in that, described sample circuit comprises:
First resistance, one end of described first resistance is connected with the 3rd end of described output filter circuit, and the other end of described first resistance is connected with the 3rd end of described feedback control circuit;
Second resistance, one end of described second resistance is connected with the other end of described first resistance, and the other end of described second resistance is connected with the first output of described transformer;
Wherein, have first node between described first resistance and described second resistance, described first node is connected with the 3rd end of described feedback control circuit.
3. Switching Power Supply as claimed in claim 1, is characterized in that, described first electric capacity and described second electric capacity calculate acquisition according to the ripple current of the power output of described Switching Power Supply and the input of described filter circuit.
4. Switching Power Supply as claimed in claim 1, is characterized in that, described first inductance calculates according to the cut-off frequency of described filter circuit and obtains.
5. Switching Power Supply as claimed in claim 1, it is characterized in that, described switch module is triode, the emitter of described triode is connected with the other end of described first inductance, the base stage of described triode is connected with the first end of described ON-OFF control circuit, and the collector electrode of described triode is connected with the first input end of described transformer.
6. a refrigerator, is characterized in that, comprises the Switching Power Supply described in any one of Claims 1 to 5.
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| CN201310163658.XA CN103219897B (en) | 2013-05-06 | 2013-05-06 | A kind of Switching Power Supply and the refrigerator with it |
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| CN201310163658.XA CN103219897B (en) | 2013-05-06 | 2013-05-06 | A kind of Switching Power Supply and the refrigerator with it |
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| CN106856374A (en) | 2017-03-08 | 2017-06-16 | 浙江驰力科技股份有限公司 | Low-frequency alternating electric field generation device and system, Signal Regulation method |
| CN106712532A (en) | 2017-03-08 | 2017-05-24 | 余铭 | Low-frequency alternating electric field generating apparatus and system, and signal conditioning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201203636Y (en) * | 2008-05-07 | 2009-03-04 | 张益民 | A meter output device |
| CN202004649U (en) * | 2011-02-17 | 2011-10-05 | 昂宝电子（上海）有限公司 | Switching power supply circuit with flyback structure |
| CN203278665U (en) * | 2013-05-06 | 2013-11-06 | 合肥美的电冰箱有限公司 | Switch power supply and refrigerator having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003152491A (en) * | 2001-11-14 | 2003-05-23 | Tamura Seisakusho Co Ltd | Cell type noise filter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201203636Y (en) * | 2008-05-07 | 2009-03-04 | 张益民 | A meter output device |
| CN202004649U (en) * | 2011-02-17 | 2011-10-05 | 昂宝电子（上海）有限公司 | Switching power supply circuit with flyback structure |
| CN203278665U (en) * | 2013-05-06 | 2013-11-06 | 合肥美的电冰箱有限公司 | Switch power supply and refrigerator having the same |
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Address after: 230601 Hefei Changjiang Road, Anhui, No. 669 Applicant after: Hefei Midea Refrigerator Co., Ltd. Address before: 230601 Hefei Changjiang Road, Anhui, No. 669 Applicant before: Hefei Media Rongshida Refrigerator Co., Ltd. |
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