CN205641039U - Surge suppression circuit and microwave oven - Google Patents
Surge suppression circuit and microwave oven Download PDFInfo
- Publication number
- CN205641039U CN205641039U CN201620262277.6U CN201620262277U CN205641039U CN 205641039 U CN205641039 U CN 205641039U CN 201620262277 U CN201620262277 U CN 201620262277U CN 205641039 U CN205641039 U CN 205641039U
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- CN
- China
- Prior art keywords
- rectification
- surge
- protection element
- electric capacity
- restraint circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a surge suppression circuit and microwave oven. Surge suppression circuit includes: rectification portion, filtering portion and protecting component. Rectification portion parcel rectification inlet side and rectified output side, the rectification inlet side is connected with the voltage input end. Filtering portion is connected with the rectified output side. The protecting component setting is in the rectified output side and connect filtering portion, and the protecting component is used for suppressing the overvoltage of rectified output side at the surge in -process. Among the above -mentioned surge suppression circuit, the protecting component can restrain the overvoltage of rectified output side at the surge in -process to improve the reliability of rectification portion and whole microwave oven circuit.
Description
Technical field
This utility model is involved in household appliance technical field, more specifically, relates to a kind of surge restraint circuit
And microwave oven.
Background technology
In the frequency-conversion microwave oven of correlation technique, the power supply circuits powered to magnetron when surge voltage occurs,
Produced by the inductance of filtering part, backward voltage can aggravate surge voltage so that rectification part is easily by over-voltage breakdown
And cause damage.
Utility model content
This utility model is intended at least to solve one of technical problem present in prior art.To this end, this reality
A kind of surge restraint circuit and microwave oven is provided with novel needs.
A kind of surge restraint circuit, including:
Rectification part, described rectification part includes rectification input side and rectification outlet side, described rectification input side with
Voltage input end connects；
Filtering part, described filtering part is connected with described rectification outlet side；And
Protection element, described protection element is arranged on described rectification outlet side and connects described filtering part, institute
State protection element for suppressing described rectification outlet side overvoltage during surge.
In above-mentioned surge restraint circuit, protection element can suppress the most electric during surge of rectification outlet side
Pressure, thus improve rectification part and the circuit reliability of whole microwave oven.
In some embodiments, described rectification outlet side includes two rectification output ends, described filtering part
Including:
Inductance, one end of described inductance is connected with a described rectification output end；And
First electric capacity, one end of described first electric capacity is connected with the other end of described inductance, described first electricity
The other end held is connected with rectification output end another described and ground end；
Described protection element is connected with described inductance in parallel.
In some embodiments, described protection element is the second electric capacity.
In some embodiments, described protection element is discharge tube.
In some embodiments, described rectification outlet side includes two outfans, described protection element with
Said two rectification output end is connected in parallel.
In some embodiments, described protection element is electric capacity.
In some embodiments, described protection element is discharge tube.
In some embodiments, described surge restraint circuit also includes inverting part and voltage multiplying rectifier portion:
Described inverting part is connected with described filtering part, and described inverting part will be for exporting via described filtering part
Unidirectional current be converted to alternating current；
Described voltage multiplying rectifier portion is connected with described inverting part, and described voltage multiplying rectifier portion is used for will be via described inverse
The alternating current of change portion output boosts and is converted to high voltage direct current and is powered output.
In some embodiments, described inverting part includes electric capacity, insulated gate bipolar transistor and transformation
Device:
The two ends of described electric capacity are connected to constitute resonant tank with the primary two ends of described transformator, described
Secondary and the described voltage multiplying rectifier portion of transformator is connected；
One end of described electric capacity also colelctor electrode with described insulated gate bipolar transistor is connected, described electric capacity
The other end be connected with described filtering part, the emitter stage of described insulated gate bipolar transistor by resistance with
Described filtering part connects；
Described insulated gate bipolar transistor is used for controlling described resonant tank to produce high-frequency alternating current
A kind of microwave oven, including the surge restraint circuit described in as above any embodiment.
Being provided with surge restraint circuit in above-mentioned microwave oven, the protection element in circuit can suppress rectification outlet side
Overvoltage during surge, thus improve rectification part and the circuit reliability of whole microwave oven, simultaneously
Also improve Surge handling capability and the reliability of microwave oven complete machine.
Additional aspect of the present utility model and advantage will part be given in the following description, part will under
The description in face becomes obvious, or is recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage are from combining accompanying drawings below to embodiment
Description in will be apparent from easy to understand, wherein:
Fig. 1 is the high-level schematic functional block diagram of the surge restraint circuit of this utility model better embodiment；
Fig. 2 is the circuit diagram of the surge restraint circuit of this utility model better embodiment；
Fig. 3 is the another circuit diagram of the surge restraint circuit of this utility model better embodiment
Fig. 4 is another circuit diagram of the surge restraint circuit of this utility model better embodiment；
Fig. 5 is another circuit diagram of the surge restraint circuit of this utility model better embodiment；
Fig. 6 is another circuit diagram of the surge restraint circuit of this utility model better embodiment；
Fig. 7 is the high-level schematic functional block diagram of the surge restraint circuit of this utility model better embodiment；
Fig. 8 is another circuit diagram of the surge restraint circuit of this utility model better embodiment.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the accompanying drawings
Going out, the most same or similar label represents same or similar element or has identical or class
Element like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining
This utility model, and it is not intended that to restriction of the present utility model.
In description of the present utility model, it is to be understood that term " first ", " second " are only used
In describing purpose, and it is not intended that instruction or hint relative importance or implicit indicate indicated skill
The quantity of art feature.Thus, define " first ", the feature of " second " can be expressed or implicit
Ground includes one or more described features.In description of the present utility model, the implication of " multiple "
It is two or more, unless otherwise expressly limited specifically.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited,
Term " is installed ", " being connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing,
Can also be to removably connect, or be integrally connected；Can be mechanically connected, it is also possible to be electrical connection or
Can be in communication with each other；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of individual element internal or the interaction relationship of two elements.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in this utility model can be understood as the case may be.
Following disclosure provides many different embodiments or example is of the present utility model for realizing
Different structure.In order to simplify disclosure of the present utility model, hereinafter to the parts of specific examples and set into
Line description.Certainly, they are the most merely illustrative, and are not intended to limit this utility model.Additionally,
This utility model can in different examples repeat reference numerals and/or reference letter, this repeat be for
Simplify and clearly purpose, itself do not indicate between discussed various embodiment and/or setting
Relation.Additionally, the various specific technique that provides of this utility model and the example of material, but ability
Territory those of ordinary skill is it can be appreciated that the application of other techniques and/or the use of other materials.
Please join Fig. 1, a kind of surge restraint circuit 100 that this utility model better embodiment provides, bag
Rectification part 10, filtering part 20 and protection element 30.
Surge restraint circuit 100 can be applicable to power for the magnetron of frequency-conversion microwave oven as switch element.
Switch element can produce strong pulse in the moment connected, and that is to say the overvoltage exceeding normal voltage.Cross
Voltage will cause the electronic component in circuit to damage.
Rectification part 10 includes rectification input side and rectification outlet side.Rectification input side is with voltage input end even
Connect, for the civil power (alternating current) of input is converted to unidirectional current.Filtering part 20 and rectification outlet side
Connecting, generally go through the voltage after rectification and still contain alternating component, filtering part 20 is then used for filtering rectification
After voltage, it is thus achieved that the purest unidirectional current.Protection element 30 be arranged on rectification outlet side and with filter
Ripple portion 20 connects, for suppressing rectification outlet side overvoltage during surge.
In above-mentioned surge restraint circuit 100, protection element 30 can suppress rectification outlet side during surge
Overvoltage, thus improve rectification part 10 and the circuit reliability of whole microwave oven.
Specifically, rectification part 10 includes bridge rectifier 12, foot 12b and 12c of bridge rectifier
It is connected with voltage input end, that is to say the rectification input side of rectification part 10, foot 12a and 12d and filtering part
20 connect, and that is to say the rectification outlet side of rectification part 10.Foot 12a and foot 12d can be defeated as two rectifications
Go out end.
In some embodiments, please join Fig. 2, filtering part 20 includes inductance 22 and the first electric capacity 24.
One end of inductance 22 is connected with a rectification output end 12a of rectification part 10, the other end of inductance 22
It is connected with one end of the first electric capacity 24.Another of the other end of the first electric capacity 24 and rectification part 10 is whole
Stream outfan 12d and ground end connect.Protection element 30 is connected in parallel with inductance 22.
Unidirectional current via rectification part 10 output is not pure unidirectional current, still contains alternating component,
Utilize inductance element to lead to the characteristic of direct current resistance exchange, may filter that alternating component via inductance 22, and inductance
22 pairs of alternating currents hinder limited in one's ability, therefore will continue through the first electric capacity 24 after inductance 22 filters
Filter, utilize capacity cell stopping direct current to lead to the characteristic of exchange, AC portion is held with switching to, thus obtains
Obtain the purest unidirectional current.This external inductance 22 is additionally operable to the differential mode interference after suppression is energized between power line.
Owing to inductance 22 can produce reverse induction voltage, backward voltage superposes with surge voltage and will aggravate
Overvoltage, so that the backward voltage of the rectification outlet side of rectification part 10 is too high so that rectification part 10
It is easier to damage, and the rectification outlet side protecting element 30 to be arranged on rectification part 10 can effectively suppress reverse
Voltage, to improve the reliability of rectification part 10.
Please join Fig. 3, in some embodiments, protection element 30 is the second electric capacity 32, the second electric capacity
32 are connected in parallel with inductance 22.So, the second electric capacity 32 can absorb inductance 22 during surge
The reverse induction voltage produced, thus reduce the backward voltage of rectification part 10 outfan.
Please join Fig. 4, in some embodiments, protection element 30 is the first discharge tube 34, and first puts
Fulgurite 34 is connected in parallel with inductance 22.Discharge tube can carry out high voltage protective to object component, works as discharge tube
During the voltage height overprotection specification at two ends, inside will appear from short circuit, and absorb input cross high pressure.Electric discharge
Pipe can be generally gas-discharge tube or semiconductor discharge tube.With the second electric capacity 32 analogously, first
Discharge tube 34 can suppress the reverse induction voltage of the inductance 22 generation during surge, thus reduces whole
The backward voltage of stream portion 10 outfan.
Please join Fig. 5, in some embodiments, protection element 30 is the 3rd electric capacity 33, the 3rd electric capacity
33 are connected in parallel with two outfans 12a, 12d of rectification part 10.It is similar with the second electric capacity 32,
3rd electric capacity 33 can absorb the rectification outlet side of rectification part 10 backward voltage during surge.
Please join Fig. 6, in some embodiments, protection element 30 is the second discharge tube 35, and second puts
Fulgurite 35 is connected in parallel with two outfans 12a, 12d of rectification part 10.With the first discharge tube 34
Similar, the second discharge tube 35 can absorb the rectification outlet side of rectification part 10 reverse electricity during surge
Pressure.
Additionally, protection element 30 can also is that transient voltage diode (Transient Voltage
Suppressor, TVS), similar with capacity cell and discharge tube element, TVS pipe may be used in wink
Between absorb big electric current, and terminal voltage is clamped down on predetermined value to avoid protected element because of transient state high energy
Amount impact and damage.
Please join Fig. 7, in some embodiments, surge restraint circuit also includes inverting part 40 and multiplication of voltage
Rectification part 50.Inverting part 40 is connected with filtering part 20, for the direct current that will export via filtering part 20
Electricity is again converted to alternating current.Voltage multiplying rectifier portion 50 is connected with inverting part 40, and voltage multiplying rectifier portion 50 uses
In the alternating current exported via inverting part being boosted and being converted to high voltage direct current and be powered output.
Specifically, in some embodiments, Fig. 8 please be join, inverting part 40 include the 4th electric capacity 42,
Insulated gate bipolar transistor 44 (Insulated Gate Bipolar Transistor, IGBT, under
Claim IGBT pipe) and transformator 46.Transformator 46 includes primary and secondary, primary two ends and the 4th
The two ends of electric capacity 42 connect and compose resonant tank.The secondary of transformator 46 is connected with voltage multiplying rectifier portion 50.
One end of 4th electric capacity 42 is connected with the colelctor electrode of IGBT pipe 44, the other end of the 4th electric capacity 42
Being connected with filtering part 20, the emitter stage of IGBT pipe 44 is connected with filtering part 20 by resistance 60.
IGBT pipe 44 is as the resonant process of on-off control resonant tank.When unidirectional current is managed by IGBT
When 44, a-c cycle as required controls conducting and closes, thus by unidirectional current according to required frequency
Segmentation, thus can become alternating current by unidirectional current, and commonly required ac frequency is higher, in other words,
IGBT pipe 44 is used for controlling resonant tank to produce high-frequency alternating current.The high-frequency alternating current produced is via change
The primary output of depressor is to secondary.
It should be noted that in the circuit diagram shown in Fig. 8, be to protect element 30 and rectification part 10
Two rectification output ends be connected in parallel as a example by illustrate.
The microwave oven of this utility model embodiment includes the surge restraint circuit of as above any embodiment
100。
Therefore, set in the above-mentioned microwave oven protection element 30 in surge restraint circuit 100 can suppress
Rectification outlet side overvoltage during surge, thus improve rectification part 10 and the circuit of whole microwave oven
Reliability, also improves Surge handling capability and the reliability of complete machine simultaneously.
Specifically, microwave oven is frequency-conversion microwave oven, can be by 50 hertz via above-mentioned surge restraint circuit 100
Household electricity conversion hereby exports to higher frequency, so that frequency-conversion microwave oven is permissible in heating process
Control output, and improve the efficiency of heating surface.
In the description of this specification, reference term " embodiment ", " some embodiments ",
The description of " exemplary embodiment ", " example ", " concrete example " or " some examples " etc.
Mean that the specific features, structure, material or the feature that combine described embodiment or example description are contained in
In at least one embodiment of the present utility model or example.In this manual, above-mentioned term is shown
The statement of meaning property is not necessarily referring to identical embodiment or example.And, the specific features of description, knot
Structure, material or feature can in any one or more embodiments or example in an appropriate manner
In conjunction with.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or
Hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include at least one this feature.In this practicality
In novel description, " multiple " are meant that at least two, such as two, three etc., unless otherwise
Specify concrete restriction.
Although above it has been shown and described that embodiment of the present utility model, it is to be understood that on
It is exemplary for stating embodiment, it is impossible to be interpreted as restriction of the present utility model, the common skill of this area
Above-mentioned embodiment can be changed in the range of this utility model by art personnel, revise, replace and
Modification.
Claims (10)
1. a surge restraint circuit, it is characterised in that including:
Rectification part, described rectification part includes rectification input side and rectification outlet side, described rectification input side with
Voltage input end connects；
Filtering part, described filtering part is connected with described rectification outlet side；And
Protection element, described protection element is arranged on described rectification outlet side and connects described filtering part, institute
State protection element for suppressing described rectification outlet side overvoltage during surge.
2. surge restraint circuit as claimed in claim 1, it is characterised in that described rectification outlet side
Including two rectification output ends, described filtering part includes:
Inductance, one end of described inductance is connected with a described rectification output end；And
First electric capacity, one end of described first electric capacity is connected with the other end of described inductance, described first electricity
The other end held is connected with rectification output end another described and ground end；
Described protection element is connected with described inductance in parallel.
3. surge restraint circuit as claimed in claim 2, it is characterised in that described protection element is
Second electric capacity.
4. surge restraint circuit as claimed in claim 2, it is characterised in that described protection element is
Discharge tube.
5. surge restraint circuit as claimed in claim 1, it is characterised in that described rectification outlet side
Including two rectification output ends, described protection element is connected in parallel with said two rectification output end.
6. surge restraint circuit as claimed in claim 5, it is characterised in that described protection element is
Electric capacity.
7. surge restraint circuit as claimed in claim 5, it is characterised in that described protection element is
Discharge tube.
8. surge restraint circuit as claimed in claim 1, it is characterised in that described Surge suppression electricity
Road also includes inverting part and voltage multiplying rectifier portion:
Described inverting part is connected with described filtering part, and described inverting part will be for exporting via described filtering part
Unidirectional current be converted to alternating current；
Described voltage multiplying rectifier portion is connected with described inverting part, and described voltage multiplying rectifier portion is used for will be via described inverse
The alternating current of change portion output boosts and is converted to high voltage direct current and is powered output.
9. surge restraint circuit as claimed in claim 8, it is characterised in that described inverting part includes
Electric capacity, insulated gate bipolar transistor and transformator:
The two ends of described electric capacity connect and compose resonant tank, described change with the primary two ends of described transformator
Secondary and the described voltage multiplying rectifier portion of depressor is connected；
One end of described electric capacity is connected with the colelctor electrode of described insulated gate bipolar transistor, described electric capacity
The other end is connected with described filtering part, and the emitter stage of described insulated gate bipolar transistor passes through resistance and institute
State filtering part to connect；
Described insulated gate bipolar transistor is used for controlling described resonant tank to produce high-frequency alternating current.
10. a microwave oven, it is characterised in that include the surge as described in any one of claim 1-9
Suppression circuit.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620262277.6U CN205641039U (en) | 2016-03-30 | 2016-03-30 | Surge suppression circuit and microwave oven |
| EP16896218.1A EP3438543A4 (en) | 2016-03-30 | 2016-06-20 | Surge suppression circuit and microwave oven |
| PCT/CN2016/086389 WO2017166445A1 (en) | 2016-03-30 | 2016-06-20 | Surge suppression circuit and microwave oven |
| US16/172,730 US20190131786A1 (en) | 2016-03-30 | 2018-10-27 | Surge suppression circuit and microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620262277.6U CN205641039U (en) | 2016-03-30 | 2016-03-30 | Surge suppression circuit and microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205641039U true CN205641039U (en) | 2016-10-12 |
Family
ID=57066759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620262277.6U Withdrawn - After Issue CN205641039U (en) | 2016-03-30 | 2016-03-30 | Surge suppression circuit and microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205641039U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605628A (en) * | 2016-03-30 | 2016-05-25 | 广东美的厨房电器制造有限公司 | Surge suppression circuit and microwave oven |
-
2016
- 2016-03-30 CN CN201620262277.6U patent/CN205641039U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605628A (en) * | 2016-03-30 | 2016-05-25 | 广东美的厨房电器制造有限公司 | Surge suppression circuit and microwave oven |
| CN105605628B (en) * | 2016-03-30 | 2018-06-19 | 广东美的厨房电器制造有限公司 | Surge restraint circuit and micro-wave oven |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161012 Effective date of abandoning: 20180619 |