CN209267452U - Microwave oven supply power circuit and micro-wave oven - Google Patents
Microwave oven supply power circuit and micro-wave oven Download PDFInfo
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- CN209267452U CN209267452U CN201920047233.5U CN201920047233U CN209267452U CN 209267452 U CN209267452 U CN 209267452U CN 201920047233 U CN201920047233 U CN 201920047233U CN 209267452 U CN209267452 U CN 209267452U
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Abstract
This application discloses a kind of microwave oven supply power circuit and micro-wave oven, the microwave oven supply power circuit includes sequentially connected current rectifying and wave filtering circuit, isolation circuit, non-isolated voltage-multiplying circuit and filter circuit；The current rectifying and wave filtering circuit is rectified and is filtered to AC power source, the DC voltage after output rectification filter；The current rectifying and wave filtering circuit and the non-isolated voltage-multiplying circuit is isolated in the isolation circuit；The DC voltage that the non-isolated voltage-multiplying circuit exports the current rectifying and wave filtering circuit boosts, and obtains high-voltage dc voltage；The output filter circuit carries out isolation filter to the high-voltage dc voltage of the non-isolated voltage-multiplying circuit output；High-voltage dc voltage after isolation filter is for being powered the magnetron of micro-wave oven.The application is boosted by non-isolated voltage-multiplying circuit, does not use power frequency or high frequency transformer is boosted and is isolated, and problem at high cost so as to avoid transformer, loss is big reduces cost, reduces loss.
Description
Technical field
This application involves micro-wave oven technical field more particularly to a kind of microwave oven supply power circuits and micro-wave oven.
Background technique
Micro-wave oven with its efficiency height, homogeneous heating in the unit time and receive the favor of more and more users.With biography
The microwave oven supply power of system is compared, and the Switching Power Supply that microwave oven supply power is continuously adjusted in a certain range using power is instead of defeated
Power can not continuously adjustable Industrial Frequency Transformer out.
When micro-wave oven works, need to provide the high direct voltage of about 4200V for internal magnetron.The high direct voltage is generated at present
Scheme mainly have power frequency boosting and high frequency boost two kinds.Power frequency boost approach needs to carry out boosting and city using Industrial Frequency Transformer
It is electrically isolated, high frequency boost approach needs to carry out boosting and mains isolation using high frequency transformer.However either Industrial Frequency Transformer
And high frequency transformer, all have the defects that at high cost, loss is big.
Utility model content
The main purpose of the application is to propose a kind of microwave oven supply power circuit and micro-wave oven, it is intended to solve existing microwave
Furnace carries out boosting and mains isolation using Industrial Frequency Transformer or high frequency transformer, there is a problem of that at high cost, loss is big.
To achieve the above object, the embodiment of the present application provides a kind of microwave oven supply power circuit, the microwave oven supply power circuit
Including sequentially connected current rectifying and wave filtering circuit, isolation circuit, non-isolated voltage-multiplying circuit and filter circuit；
The current rectifying and wave filtering circuit, the direct current for being rectified and being filtered to AC power source, after output rectification filter
Pressure；
The isolation circuit, for the current rectifying and wave filtering circuit and the non-isolated voltage-multiplying circuit to be isolated；
The non-isolated voltage-multiplying circuit, the DC voltage for exporting to the current rectifying and wave filtering circuit boost, obtain
High-voltage dc voltage；
The output filter circuit, for carrying out isolation filter to the high-voltage dc voltage of the non-isolated voltage-multiplying circuit output
Wave；High-voltage dc voltage after isolation filter is for being powered the magnetron of micro-wave oven.
In addition, to achieve the above object, the embodiment of the present application provides a kind of micro-wave oven, and the micro-wave oven includes above-mentioned micro-
Wave furnace power circuit.
Microwave oven supply power circuit and micro-wave oven provided by the embodiments of the present application, are risen by non-isolated voltage-multiplying circuit
Pressure, does not use power frequency or high frequency transformer is boosted and is isolated, at high cost so as to avoid transformer, loss is big asks
Topic reduces cost, reduces loss.
Detailed description of the invention
Fig. 1 is the main loop of power circuit schematic diagram of microwave oven supply power using power frequency boost approach；
Fig. 2 is the main loop of power circuit schematic diagram of microwave oven supply power using high frequency boost approach；
Fig. 3 is the matched integral insulation structural schematic diagram with power frequency boosting micro-wave oven；
Fig. 4 is the matched integral insulation structural schematic diagram with high frequency boosting micro-wave oven；
Fig. 5 is the microwave oven supply power electrical block diagram of the application first embodiment；
Fig. 6 is another structural schematic diagram of microwave oven supply power circuit of the application first embodiment；
Fig. 7 is the microwave oven supply power examples of circuits structural schematic diagram of the embodiment of the present application；
Fig. 8 is another exemplary construction schematic diagram of microwave oven supply power circuit of the embodiment of the present application；
Fig. 9 is the booster circuit first structure diagram of the microwave oven supply power circuit of the embodiment of the present application；
Figure 10 is the second structural schematic diagram of booster circuit of the microwave oven supply power circuit of the embodiment of the present application；
Figure 11 is the booster circuit third structural schematic diagram of the microwave oven supply power circuit of the embodiment of the present application；
Figure 12 is the microwave oven schematic diagram of the application second embodiment.
The embodiments will be further described with reference to the accompanying drawings for realization, functional characteristics and the advantage of the application purpose.
Specific embodiment
It should be appreciated that specific embodiment described herein is only used to explain the application, it is not used to limit the application.
The each embodiment of the application is realized in description with reference to the drawings.In subsequent description, using for indicating
The suffix of such as " module ", " component " or " unit " of element is only for being conducive to the explanation of the application, and there is no special for itself
Fixed meaning.
It will be further appreciated that the term "and/or" used in present specification and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
First embodiment:
In order to preferably illustrate the present embodiment, boost below in conjunction with Fig. 1-Fig. 4 to existing power frequency and high frequency boost approach
It is illustrated:
Fig. 1 is the main loop of power circuit schematic diagram of microwave oven supply power using power frequency boost approach, and the program uses power frequency transformation
Alternating current (220V/50Hz or 110V/60Hz) is boosted to 4200V by device T and voltage doubling rectifing circuit.In this scenario, power frequency transformation
Device T generallys use silicon steel sheet and conducting wire coiling, and since working frequency is low, volume of transformer is big, big (generally higher than 2 public affairs of weight
Jin), it is lost also higher.
Fig. 2 is the main loop of power circuit schematic diagram of microwave oven supply power using high frequency boost approach, and the program uses high frequency transformation
Device T1 and voltage doubling rectifing circuit generate 4200V high pressure, and principle is to carry out rectifying and wave-filtering to alternating current first, are then opened by high frequency
The half-bridge or single tube switching circuit of pass are converted to high frequency voltage electric current, are boosted by high frequency transformer T1.In this scenario,
The switching frequency of high-frequency switch circuit is typically larger than 20KHz, and high frequency transformer T1 generally uses FERRITE CORE and conducting wire coiling,
Since working frequency is low, volume of transformer and weight are smaller, but technique for coiling is complicated, and at high cost, internal loss is big, and generate heat ratio
It is more serious.
In addition to playing the role of boosting, there are one be the effect that alternating current is isolated for Industrial Frequency Transformer or high frequency transformer.
Since the metal shell of magnetron is the one of electrode of itself, and it is secured directly on microwave oven cavity, and micro-wave oven
Cavity and metal shell are conductive, so if alternating current will pass sequentially through magnetron power supply circuit, magnetic without transformer isolation
Keyholed back plate shell, microwave oven cavity reach microwave oven shell, when people touches micro-wave oven will by human body be connected to microwave oven shell and
Greatly, forming circuit leads to electric shock accidents.
There are two types of same as the integral insulation scheme of microwave oven matching for using transformer to boost, Fig. 3 is and power frequency
The matched integral insulation structural schematic diagram of boosting micro-wave oven, Fig. 4 are the matched integral insulation knot with high frequency boosting micro-wave oven
Structure schematic diagram.From Fig. 3 and Fig. 4 it is known that the magnetron metal shell of existing micro-wave oven, micro-wave oven metal cavity and micro-wave oven
Shell is being electrically connection (be conductively connected in figure is that various forms of metals connect), and is connected with alternating current protecting field, electricity
Gas isolation scheme is mainly to pass through transformer (shown in the T of Fig. 3 and Fig. 4) realization.
However either Industrial Frequency Transformer and high frequency transformer, all have the defects that at high cost, loss is big.
Based on defect existing for above scheme, as shown in figure 5, the application first embodiment provides a kind of microwave oven supply power electricity
Road, the microwave oven supply power circuit include sequentially connected current rectifying and wave filtering circuit 11, isolation circuit 12, non-isolated voltage-multiplying circuit 13
And output filter circuit 14.
The current rectifying and wave filtering circuit 11, the direct current for being rectified and being filtered to AC power source, after output rectification filter
Voltage.
The isolation circuit 12, for the current rectifying and wave filtering circuit 11 and the non-isolated voltage-multiplying circuit 13 to be isolated.
The non-isolated voltage-multiplying circuit 13, the DC voltage for exporting to the current rectifying and wave filtering circuit 11 boost,
Obtain high-voltage dc voltage.
In the present embodiment, the non-isolated voltage-multiplying circuit 13 includes driving circuit 131 and cascade multiple booster circuits
132；
Cascade multiple booster circuits 132, the DC voltage for exporting to the current rectifying and wave filtering circuit 11 carry out
Boosting；
The driving circuit 131, for driving cascade multiple booster circuits 132.
The output filter circuit 14, the high-voltage dc voltage for being exported to the non-isolated voltage-multiplying circuit 13 carry out every
From filtering；High-voltage dc voltage after isolation filter is for being powered the magnetron of micro-wave oven.
It please refers to shown in Fig. 6, in one embodiment, between the current rectifying and wave filtering circuit 11 and the isolation circuit 12
It further include busbar voltage adjustment circuit 120；
The busbar voltage adjustment circuit 120, the DC voltage for exporting to the current rectifying and wave filtering circuit 11 are adjusted
It is whole.
In order to preferably illustrate microwave oven supply power circuit, it is illustrated below in conjunction with Fig. 7-Figure 11:
As shown in fig. 7, the current rectifying and wave filtering circuit 11 includes diode rectifier bridge and filter capacitor Cs.Filter capacitor CsAnd
It is associated in the positive and negative anodes output end of the diode rectifier bridge.Filter capacitor CsLow capacity capacitor or large bulk capacitance can be used.
The isolation circuit 12 uses inductance LsIt is isolated, inductance LsIt is connected in series in the diode rectifier bridge just
Pole output end.
A busbar voltage adjustment circuit can be also connected between the current rectifying and wave filtering circuit 11 and the isolation circuit 12
120.Busbar voltage adjustment circuit 120 can play busbar voltage corrective action, so that circuit is adapted to broader input voltage, together
When voltage waveform that current rectifying and wave filtering circuit 11 exports can be carried out the adjustment of amplitude and waveform, facilitate subsequent non-isolated times of piezoelectricity
The boosting work on road 13.
As shown in figure 8, the busbar voltage adjustment circuit 120 includes inductance Lb, power switch tube Qb, diode DbAnd
Capacitor Cb；
The inductance LbOne end connect with the cathode output end of the current rectifying and wave filtering circuit 11 (i.e. diode rectifier bridge),
The inductance LbThe other end and the power switch tube QbInput terminal and the diode DbAnode connection, the function
Rate switching tube QbOutput end and the capacitor CbOne end and the current rectifying and wave filtering circuit 11 (i.e. diode rectifier bridge) cathode
Output end connection, the diode DbCathode and the capacitor CbThe other end connection, the power switch tube QbControl terminal
For receiving driving signal.
As shown in Fig. 7 or Fig. 8, in one embodiment, each booster circuit 132 includes capacitor Ck, diode
Dk, power switch tube Qk, diode VkAnd resistance Rk(wherein, k 1,2 ..., n)；
The capacitor CkOne end and the power switch tube QkInput terminal and the diode DkAnode connection,
The capacitor CkThe other end and the diode VkAnode connection, the power switch tube QkOutput end pass through the electricity
Hinder RkWith the diode VkCathode connection, the power switch tube QkControl terminal for receiving driving signal.
As shown in figure 9, in one embodiment, each booster circuit 120 includes power switch tube Sk, diode
Dka, diode DkAnd capacitor Ck(wherein, k 1,2 ..., n)；
The power switch tube SkInput terminal and the diode DkaAnode connection, the power switch tube SkIt is defeated
Outlet and the capacitor CkOne end and the diode DkAnode connection, the diode DkaCathode and the electricity
Hold CkThe other end connection, the power switch tube SkControl terminal for receiving driving signal.
As shown in Figure 10, in one embodiment, each booster circuit 132 includes power switch tube Sk, two poles
Pipe Dk, inductance LkWith capacitor Ck(wherein, k 1,2 ..., n)；
The power switch tube SkInput terminal and the diode DkAnode connection, the diode DkCathode with
The capacitor CkOne end connection, the power switch tube SkOutput end and the inductance LkWith the capacitor CkThe other end
Connection, the power switch tube SkControl terminal for receiving driving signal.
As shown in figure 11, in another embodiment, each booster circuit 132 includes power switch tube Sk, two
Pole pipe Dk, inductance LkWith capacitor Ck(wherein, k 1,2 ..., n)；
The power switch tube SkInput terminal and the inductance LkWith the capacitor CkOne end connection, the power opens
Close pipe SkOutput end and the diode DkCathode connection, the capacitor CkThe other end and the diode DkAnode
Connection, the power switch tube SkControl terminal for receiving driving signal.
It should be noted that the power switch tube of above-mentioned each embodiment can be metal-oxide-semiconductor or IGBT.Such as Fig. 7 or
Shown in person Fig. 8, power switch tube is metal-oxide-semiconductor, and the input terminal of power switch tube is the drain electrode of metal-oxide-semiconductor, the input of power switch tube
End is the source electrode of metal-oxide-semiconductor.
It refer again to shown in Fig. 7, the input terminal of the driving circuit 131 is for obtaining voltage signal and current signal.Electricity
Pressing signal includes Vis、Vos、Vt, VisPass through RVi1、RVi2The sampling circuit samples of composition obtain, VosPass through RVO1、RVO2Composition is adopted
Sample circuit sampling obtains, VtIt is temperature sensing circuit to the voltage signal come out.Current signal includes Iis、Ios, IisPass through electric current
Sampling resistor Rcs1Sampling obtains, IosPass through current sampling resistor Rcs2Sampling obtains.Current sampling resistor Rcs1And Rcs2Position
To be schematic, they can be connected on any position that can measure input current and output electric current.The driving circuit 131
Output end is used to drive power switch tube and filament control in booster circuit 132.Fig. 8 is unlike Fig. 7, the driving
The voltage signal of the input terminal of circuit 131 further includes Vbs、Vp。VbsPass through RVb1、RVb2The sampling circuit samples of composition obtain, VpIt is
The detection of electrical leakage of AC power source is obtained.
Microwave oven supply power circuit provided in this embodiment, is boosted by non-isolated voltage-multiplying circuit, is not used power frequency
Or high frequency transformer is boosted and is isolated, problem at high cost so as to avoid transformer, loss is big reduces cost, reduces
Loss.
Second embodiment:
The application second embodiment provides a kind of micro-wave oven, and micro-wave oven includes the electricity of microwave oven supply power described in first embodiment
Road.
Microwave oven supply power circuit can refer to foregoing teachings, and therefore not to repeat here.
It please refers to shown in Figure 12, is non-conductive connection, the micro-wave oven between the metal cavity and shell of the micro-wave oven
Metal cavity be connected to ground.For Figure 12 compared with the scheme of Fig. 3, Fig. 4, Figure 12 is new electrical isolation scheme, ensures electricity consumption
Safety.Benefit using new electrical isolation scheme is no longer to need to be isolated using transformer in power circuit, to reduce
The cost of overall plan reduces electricity loss.
Micro-wave oven provided in this embodiment is boosted by non-isolated voltage-multiplying circuit, does not use power frequency or high frequency becomes
Depressor is boosted and is isolated, and problem at high cost so as to avoid transformer, loss is big reduces cost, reduces loss.
The above is only preferred embodiment of the present application, are not intended to limit the scope of the patents of the application, all to utilize this Shen
Please equivalent structure or equivalent flow shift made by specification and accompanying drawing content, be applied directly or indirectly in other relevant skills
Art field similarly includes in the scope of patent protection of the application.
Claims (10)
1. a kind of microwave oven supply power circuit, which is characterized in that the microwave oven supply power circuit includes sequentially connected rectifying and wave-filtering
Circuit, isolation circuit, non-isolated voltage-multiplying circuit and output filter circuit；
The current rectifying and wave filtering circuit, the DC voltage for being rectified and being filtered to AC power source, after output rectification filter；
The isolation circuit, for the current rectifying and wave filtering circuit and the non-isolated voltage-multiplying circuit to be isolated；
The non-isolated voltage-multiplying circuit, the DC voltage for exporting to the current rectifying and wave filtering circuit boost, and obtain high pressure
DC voltage；
The output filter circuit, for carrying out isolation filter to the high-voltage dc voltage of the non-isolated voltage-multiplying circuit output；
High-voltage dc voltage after isolation filter is for being powered the magnetron of micro-wave oven.
2. microwave oven supply power circuit according to claim 1, which is characterized in that the current rectifying and wave filtering circuit and the isolation
It further include busbar voltage adjustment circuit between circuit；
The busbar voltage adjustment circuit, the DC voltage for exporting to the current rectifying and wave filtering circuit are adjusted.
3. microwave oven supply power circuit according to claim 2, which is characterized in that the busbar voltage adjustment circuit includes the
One inductance, the first power switch tube, first diode and first capacitor；
One end of first inductance is connect with the cathode output end of the current rectifying and wave filtering circuit, the other end of first inductance
It is connect with the anode of the input terminal of first power switch tube and the first diode, first power switch tube
One end of output end and the first capacitor is connect with the cathode output end of the current rectifying and wave filtering circuit, the first diode
Cathode is connect with the other end of the first capacitor, and the control terminal of first power switch tube is for receiving driving signal.
4. microwave oven supply power circuit according to claim 1, which is characterized in that the non-isolated voltage-multiplying circuit includes driving
Circuit and cascade multiple booster circuits；
Cascade multiple booster circuits, the DC voltage for exporting to the current rectifying and wave filtering circuit boost；
The driving circuit, for driving cascade multiple booster circuits.
5. microwave oven supply power circuit according to claim 4, which is characterized in that each booster circuit includes the second electricity
Appearance, the second diode, the second power switch tube, third diode and first resistor；
The anode of the input terminal and second diode of one end of second capacitor and second power switch tube connects
It connects, the other end of second capacitor is connect with the anode of the third diode, the output end of second power switch tube
It is connect by the first resistor with the cathode of the third diode, the control terminal of second power switch tube is for receiving
Driving signal.
6. microwave oven supply power circuit according to claim 4, which is characterized in that each booster circuit includes third function
Rate switching tube, the 4th diode, the 5th diode and third capacitor；
The input terminal of the third power switch tube is connect with the anode of the 4th diode, the third power switch tube
Output end is connect with the anode of one end of the third capacitor and the 5th diode, the cathode of the 4th diode
It is connect with the other end of the third capacitor, the control terminal of the third power switch tube is for receiving driving signal.
7. microwave oven supply power circuit according to claim 4, which is characterized in that each booster circuit includes the 4th function
Rate switching tube, the 6th diode, the second inductance and the 4th capacitor；
The input terminal of 4th power switch tube is connect with the anode of the 6th diode, the cathode of the 6th diode
It is connect with one end of the 4th capacitor, the output end and second inductance of the 4th power switch tube and the 4th electricity
The other end of appearance connects, and the control terminal of the 4th power switch tube is for receiving driving signal.
8. microwave oven supply power circuit according to claim 4, which is characterized in that each booster circuit includes the 5th function
Rate switching tube, the 7th diode, third inductance and the 5th capacitor；
The input terminal of 5th power switch tube is connect with one end of the third inductance and the 5th capacitor, and the described 5th
The output end of power switch tube is connect with the cathode of the 7th diode, the other end and the described 7th 2 of the 5th capacitor
The anode of pole pipe connects, and the control terminal of the 5th power switch tube is for receiving driving signal.
9. a kind of micro-wave oven, which is characterized in that the micro-wave oven includes any microwave oven supply power electricity of claim 1-8
Road.
10. micro-wave oven according to claim 9, which is characterized in that be between the metal cavity and shell of the micro-wave oven
The metal cavity of non-conductive connection, the micro-wave oven is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920047233.5U CN209267452U (en) | 2019-01-11 | 2019-01-11 | Microwave oven supply power circuit and micro-wave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920047233.5U CN209267452U (en) | 2019-01-11 | 2019-01-11 | Microwave oven supply power circuit and micro-wave oven |
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| Publication Number | Publication Date |
|---|---|
| CN209267452U true CN209267452U (en) | 2019-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920047233.5U Withdrawn - After Issue CN209267452U (en) | 2019-01-11 | 2019-01-11 | Microwave oven supply power circuit and micro-wave oven |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510460A (en) * | 2019-01-11 | 2019-03-22 | 深圳戴普森新能源技术有限公司 | Microwave oven supply power circuit and micro-wave oven |
-
2019
- 2019-01-11 CN CN201920047233.5U patent/CN209267452U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510460A (en) * | 2019-01-11 | 2019-03-22 | 深圳戴普森新能源技术有限公司 | Microwave oven supply power circuit and micro-wave oven |
| CN109510460B (en) * | 2019-01-11 | 2024-02-09 | 深圳戴普森新能源技术有限公司 | Microwave oven power supply circuit and microwave oven |
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