CN203278665U - Switch power supply and refrigerator having the same - Google Patents
Switch power supply and refrigerator having the same Download PDFInfo
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- CN203278665U CN203278665U CN 201320243479 CN201320243479U CN203278665U CN 203278665 U CN203278665 U CN 203278665U CN 201320243479 CN201320243479 CN 201320243479 CN 201320243479 U CN201320243479 U CN 201320243479U CN 203278665 U CN203278665 U CN 203278665U
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Abstract
The utility model discloses a switch power supply. The switch power supply comprises a rectification circuit, a filter circuit, a switch module, a switch control circuit and a transformer, wherein the rectification circuit converts input AC current into DC current; the filter circuit comprises a first inductor, a second inductor, a first capacitor and a second capacitor; one terminal of the first inductor is connected with the first output terminal of the rectification circuit; one terminal of the second inductor is connected with the second output terminal of the rectification circuit; the first capacitor has one terminal connected with one terminal of the first inductor and the other terminal connected with one terminal of the second inductor; the second capacitor has one terminal connected with the other terminal of the first inductor and the other terminal connected with the other terminal of the second inductor; the first terminal of the switch module is connected with the other terminal of the first inductor; the switch control circuit is used for controlling the switching-on and switching-off of the switch module; and the transformer has a first input terminal connected with the third terminal of the switch module and a second input terminal connected with the other terminal of the second inductor. The switch supply provided by the utility model can not only satisfy EMI and EMC testing requirements but also reduce cost. The utility model also provides a refrigerator.
Description
Technical field
The utility model relates to power technique fields, particularly a kind of Switching Power Supply, and the refrigerator with this Switching Power Supply.
Background technology
Generally, the output voltage that can observe rectification circuit from oscilloscope is not pure direct current, and differs greatly with direct current, contains larger ripple component in waveform, is called ripple.For obtaining more satisfactory direct voltage, need to utilize have the energy storage effect reactive components for example the filter circuit that forms of electric capacity, inductance come ripple component in the filtering Output Voltage in Rectified Circuits to obtain direct voltage.Filter circuit commonly used 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, also is known as electronic filter.The size of the ripple component in direct current represents with ripple factor, and this value is larger, and 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.For example, 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 all-wave and bridge rectifier employing C type filter circuit, and its ripple factor S=1/ (4 (RLC/T-1), wherein, S is ripple factor, and R is resistance value, and L is inductance, and C is electric capacity, T is the cycle.
In addition, as shown in Figure 1,12W switching power circuit commonly used partly comprises at present: 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 R 01 and resistance R 02, R0L is load, civil power 220V/50Hz input switch power supply, Switching Power Supply are output as load R0L power supply.voltage is general direct after rectification carries out filtering with electric capacity, when adopting electric capacity to carry out filtering, need very large capacitance just can satisfy the demands, but, large bulk capacitance is powering up the very large short circuit current of moment existence, this electric current is to rectifier diode, the impact of transformer is very large, and existing 12W Switching Power Supply is satisfying EMI(Electro-Magnetic Interference, electromagnetic interference), EMC(Electro-Magnetic Compatibility, Electro Magnetic Compatibility) under the requirement of test, the cost of the large electrochemical capacitor that the common mode inductance that adopts and filtering are used is higher.in order to reduce the impact to rectifier diode and transformer in household electrical appliances moments of large electric capacity, general way can add a power-type NTC(Negative Temperature Coefficient before rectification circuit, negative temperature coefficient) thermistor is kept balance, resistance is very large at normal temperatures because of the NTC thermistor, power up rear along with temperature raises, resistance value reduces rapidly, can play the effect of soft start, the shortcoming of sort circuit is: after outage, in thermal time constant, the NTC thermistor does not return to zero-power resistance, so be not suitable for frequent starting.In addition, when adopting the LC/LT mode filter to carry out filtering, tend to due to come from not mating of filter terminal impedance cause circuit under a certain frequency with circuit in other elements produce resonance, thereby affect the normal operation of circuit.
The utility model content
The purpose of this utility model is intended to solve at least to a certain extent one of above-mentioned technical problem.
For this reason, a purpose of the present utility model is to propose a kind of Switching Power Supply, and this Switching Power Supply can when satisfying EMI, EMC test request, can reduce costs.
Another purpose of the present utility model is to propose a kind of refrigerator.
For achieving the above object, the utility model proposes a kind of Switching Power Supply, this Switching Power Supply comprises: the alternating current of input is converted into galvanic rectification circuit; Filter circuit, described filter circuit comprises: the first inductance and the second inductance, an end of described the first inductance is connected with the first output of described rectification circuit, and an end of described the second inductance is connected with the second output of described rectification circuit; The first electric capacity, an end of described the first electric capacity is connected with an end of described the first inductance, and the other end of described the first electric capacity is connected with an end of described the second inductance; The second electric capacity, an end of described the second electric capacity is connected with the other end of described the first inductance, and the other end of described the second electric capacity is connected with the other end of described the second inductance; Switch module, the first end of described switch module is connected with the other end of described the first inductance; Be used 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 the 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 the second inductance, and the first output of described transformer is the first output of described Switching Power Supply.
Switching Power Supply according to the utility model embodiment, by the filter circuit that is consisted of by two inductance and two electric capacity, input voltage is carried out filtering, can satisfy the output demand of Switching Power Supply and the requirement that EMI is detected, and do not need common mode inductance, circuit structure is simpler, has reduced cost.
Further, above-mentioned Switching Power Supply also comprises: the X structure capacitive that the input AC electricity is carried out filtering, the first input end of described X structure capacitive is connected with two inputs of alternating current respectively with the second input, the 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, an 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, the 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, described sample circuit comprises: be connected with the 3rd end of the described output filter circuit other end of described the first resistance of the first resistance, an end of described the first resistance is connected with the 3rd end of described feedback control circuit; The second resistance, an end of described the second resistance is connected with the other end of described the first resistance, and the other end of described the second resistance is connected with the first output of described transformer; Wherein, have first node between described the first resistance and described the second resistance, described first node is connected with the 3rd end of described feedback control circuit.
Preferably, described the first electric capacity and described the second electric capacity can calculate acquisition according to the power output of described Switching Power Supply and the ripple current of described filter circuit input.
In addition, described the first inductance can calculate according to the cut-off frequency of described filter circuit and obtain.
Preferably, described switch module can be triode, the emitter of described triode is connected with the other end of described the first inductance, and 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, of the present utility model a kind of refrigerator proposed on the other hand, this refrigerator comprises the Switching Power Supply of above-mentioned proposition.
According to the refrigerator of the utility model embodiment, by adopting above-mentioned Switching Power Supply, can reduce costs when satisfying the requirement of refrigerator master control borad.
The aspect that the utility model is additional and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Description of drawings
Above-mentioned and/or the additional aspect of the utility model and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is the block diagram of structure of the Switching Power Supply of prior art;
Fig. 2 is the block diagram according to the structure of the Switching Power Supply of the utility model embodiment;
Fig. 3 is the block diagram according to the structure of the Switching Power Supply of an embodiment of the present utility model; And
Fig. 4 is the block diagram according to the refrigerator of the utility model embodiment.
Embodiment
The below describes embodiment of the present utility model in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Disclosing hereinafter provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter parts and the setting of specific examples are described.Certainly, they are only example, and purpose does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and purpose clearly, itself not indicate the relation between the various embodiment that discuss of institute and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skills can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.
In description of the present utility model, need to prove, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, can be also the connection of two element internals, can be directly to be connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
With reference to following description and accompanying drawing, with these and other aspects of clear embodiment of the present utility model.In these descriptions and accompanying drawing, specifically disclose some specific implementations in embodiment of the present utility model, represent to implement some modes of the principle of embodiment of the present utility model, but should be appreciated that the scope of embodiment of the present utility model is not limited.On the contrary, embodiment of the present utility model comprises spirit and interior all changes, modification and the equivalent of intension scope that falls into additional claims.
The Switching Power Supply that proposes according to the utility model embodiment 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 utility model embodiment comprises: rectification circuit 201, filter circuit 202, switch module 203, ON-OFF control circuit 204 and transformer 205.Wherein, rectification circuit 201 is converted into direct current with the alternating current of input.Filter circuit 202 carries out filtering with the output voltage of rectification circuit 201.
Further, filter circuit 202 comprises: the first inductance 206, the second inductance 207, the first electric capacity 208 and the second electric capacity 209.Wherein, an end of the first inductance 206 is connected with the first output 53 of rectification circuit 201, and an end of the second inductance 207 is connected with the second output 54 of rectification circuit 201; One end of the first electric capacity 208 is connected with an end of the first inductance 206, and the other end of the first electric capacity 208 is connected with an end of the second inductance 207; One end of the 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 used for conducting and the disconnection of control switch module 203, 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 an embodiment of the present utility model, 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, 301 pairs of input AC electricity of X structure capacitive 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, the 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, the 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 R 1 and the second resistance R 2.Wherein, an end of the first resistance R 1 is connected with the 3rd end 63 of output filter circuit 302, and the other end of the first resistance R 1 is connected with the 3rd end 83 of feedback control circuit 304.One end of the second resistance R 2 is connected with the other end of the first resistance R 1, and the other end of the second resistance R 2 is connected with the first output 33 of transformer 205.Wherein, have first node 9 between the first resistance R 1 and the second resistance R 2, first node 9 is connected with the 3rd end 83 of feedback control circuit 304.Resistance R
LBe load, Switching Power Supply is output as resistance R
LPower supply.
In an embodiment of the present utility model, as shown in Figure 3, switch module 203 can be triode, can also can realize the device of on-off action for metal-oxide-semiconductor or controllable silicon etc.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, carry out filtering through X structure capacitive 301, again by becoming pulsating direct current after rectification circuit 201 rectifications, then by filter circuit 202, pulsating direct current is converted into more smooth direct current, and controls the conducting of triode and end to generate alternating current by ON-OFF control circuit 204, alternating current carries out transformation to obtain the required voltage value through transformer 205, obtain direct voltage through output filter circuit 302 again, be load R
LPower supply, in order to make output voltage stabilization, having adopted sample circuit 303 that error is carried out optical coupling through feedback control circuit 304 amplifies, feed back to ON-OFF control circuit 204, ON-OFF control circuit 203 is controlled conducting and the deadline (being duty ratio) of triode by PWM, so that the output voltage of Switching Power Supply keeps stable.
Normally, end can increase a filter capacitor in " source " or " load " of LC mode filter, to change the impedance of filter input end, namely consist of π type filter circuit, first pass through low-impedance filter capacitor loop from the noise in " source " or " load ", then enter into LC type filter circuit.The filter circuit 202 of the Switching Power Supply of the utility model embodiment consists of π type filter circuit by the first inductance 206, the first electric capacity 208 and the second electric capacity 209, can suppress simultaneously noise and harmonic signal from power supply and circuit side, increased again simultaneously by the second inductance 207, can reduce EMI by the second inductance 207 and disturb, reach the requirement that the Switching Power Supply electromagnetic interference detects.Wherein, the first inductance 206 can calculate according to the cut-off frequency of filter circuit 202 and obtain, the first electric capacity 208 and the second electric capacity 209 can calculate acquisition according to the parameter of designed Switching Power Supply such as the ripple current of power output and filter circuit 202 inputs, wherein, the first inductance 206, the first electric capacity 208 and the second electric capacity 209 be calculated as prior art, here repeat no more.Only need the parameter of the Y electric capacity of the second suitable inductance 207 of selection and transformer 205, the EMI that can suppress circuit disturbs to satisfy the requirement of Switching Power Supply.In addition, filter circuit 202 adopts two electric capacity and two inductance, make its input and output all be 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 that occurs due to the insertion of element or device at the book office of transmission system, and insertion loss can be expressed as this element or device inserts power received in front load and the ratio that inserts power (take decibel as unit) received in same load afterwards.In embodiment of the present utility model, can select suitable filter circuit 202 parameters according to physical circuit, can realize the output demand of Switching Power Supply and the requirement of inhibition EMI.
In sum, according to the Switching Power Supply of the utility model embodiment, by the filter circuit that is consisted of by two inductance and two electric capacity, input voltage is carried out filtering, can satisfy the output demand of Switching Power Supply and the requirement that EMI is detected, and do not need common mode inductance, reduced cost.
Refrigerator according to the utility model embodiment is described with reference to the accompanying drawings.
As shown in Figure 4, the refrigerator 401 of the utility model embodiment comprises the Switching Power Supply 402 of above-described embodiment.
According to the refrigerator of the utility model embodiment, by adopting above-mentioned Switching Power Supply, can reduce costs when satisfying the requirement of refrigerator master control borad.
Each functional unit in each embodiment of the utility model can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that in the situation that do not break away from principle of the present utility model and spirit can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is by claims and be equal to and limit.
Claims (7)
1. a Switching Power Supply, is characterized in that, comprising:
The alternating current of input is converted into galvanic rectification circuit;
Filter circuit, described filter circuit comprises:
The first inductance and the second inductance, an end of described the first inductance is connected with the first output of described rectification circuit, and an end of described the second inductance is connected with the second output of described rectification circuit;
The first electric capacity, an end of described the first electric capacity is connected with an end of described the first inductance, and the other end of described the first electric capacity is connected with an end of described the second inductance;
The second electric capacity, an end of described the second electric capacity is connected with the other end of described the first inductance, and the other end of described the second electric capacity is connected with the other end of described the second inductance;
Switch module, the first end of described switch module is connected with the other end of described the first inductance;
Be used 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 the 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 the second inductance, and the first output of described transformer is the first output of described Switching Power Supply.
2. Switching Power Supply as claimed in claim 1, is characterized in that, also comprises:
The input AC electricity is carried out the X structure capacitive of filtering, the first input end of described X structure capacitive is connected with two inputs of alternating current respectively with the second input, the 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, 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, the 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.
3. Switching Power Supply as claimed in claim 2, is characterized in that, described sample circuit comprises:
The first resistance, an end of described the first resistance is connected with the 3rd end of described output filter circuit, and the other end of described the first resistance is connected with the 3rd end of described feedback control circuit;
The second resistance, an end of described the second resistance is connected with the other end of described the first resistance, and the other end of described the second resistance is connected with the first output of described transformer;
Wherein, have first node between described the first resistance and described the second resistance, described first node is connected with the 3rd end of described feedback control circuit.
4. Switching Power Supply as claimed in claim 1, is characterized in that, described the first electric capacity and described the second electric capacity calculate acquisition according to the power output of described Switching Power Supply and the ripple current of described filter circuit input.
5. Switching Power Supply as claimed in claim 1, is characterized in that, described the first inductance calculates acquisition according to the cut-off frequency of described filter circuit.
6. 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 the 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.
7. a refrigerator, is characterized in that, comprises the described Switching Power Supply of claim 1～6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320243479 CN203278665U (en) | 2013-05-06 | 2013-05-06 | Switch power supply and refrigerator having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320243479 CN203278665U (en) | 2013-05-06 | 2013-05-06 | Switch power supply and refrigerator having the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278665U true CN203278665U (en) | 2013-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320243479 Withdrawn - After Issue CN203278665U (en) | 2013-05-06 | 2013-05-06 | Switch power supply and refrigerator having the same |
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| Country | Link |
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| CN (1) | CN203278665U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219897A (en) * | 2013-05-06 | 2013-07-24 | 合肥美的荣事达电冰箱有限公司 | Switching power supply and refrigerator with same |
-
2013
- 2013-05-06 CN CN 201320243479 patent/CN203278665U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219897A (en) * | 2013-05-06 | 2013-07-24 | 合肥美的荣事达电冰箱有限公司 | Switching power supply and refrigerator with same |
| CN103219897B (en) * | 2013-05-06 | 2015-12-30 | 合肥美的电冰箱有限公司 | A kind of Switching Power Supply and the refrigerator with it |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20151230 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |