CN206585782U - A kind of microwave oven supply power circuit and micro-wave oven - Google Patents
A kind of microwave oven supply power circuit and micro-wave oven Download PDFInfo
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- CN206585782U CN206585782U CN201720348204.3U CN201720348204U CN206585782U CN 206585782 U CN206585782 U CN 206585782U CN 201720348204 U CN201720348204 U CN 201720348204U CN 206585782 U CN206585782 U CN 206585782U
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Abstract
The utility model discloses a kind of microwave oven supply power circuit and micro-wave oven, the power circuit includes：Current rectifying and wave filtering circuit, power conversion circuit, voltage monitoring protection circuit and control module, voltage monitoring protection circuit are used for the voltage Vds for obtaining power switch pipe；Voltage Vds is obtained into voltage Vaver after average and partial pressure switch；Voltage Vaver is compared with set threshold voltage Vref, controls power switch pipe to close according to comparative result output control signal.Microwave oven supply power circuit and micro-wave oven disclosed in the utility model, carry out conversion comparison by obtaining power switch tube voltage, control power switch pipe to close according to comparative result, realize output over-voltage protection function；Direct sampling and outputting voltage is not needed to realize output over-voltage protection, it is not necessary to increase photoelectrical coupler, circuit is simple, cost is low, is conducive to the miniaturization of power supply overall dimensions.
Description
Technical field
The utility model is related to microwave oven supply power technical field, more particularly to a kind of microwave oven supply power circuit and micro-wave oven.
Background technology
Micro-wave oven has unique mode of heating, essentially consists in the part magnetron for realizing microwave heating.Magnetron is to work
Make that voltage is extremely sensitive, do not meeting the operating at voltages of specification requirement, fragile magnetron, reduction service life.If work
Make overtension, it is too high to be likely to result in heating chamber for microwave oven temperature, influence heating effect；It is also possible to causing the temperature rise of micro-wave oven
It is too high, fire is likely to cause when serious.Therefore, how to ensure that magnetron works in suitable voltage range, and in abnormal feelings
Magnetron how is protected just to seem particularly significant under condition.
During the utility model is realized, inventor has found that prior art has problems with：Prior art is to micro-
The operating voltage of ripple stove magnetron does not have any monitoring and protection, and is typically direct sampling and outputting voltage in normal power supplies
To realize output over-voltage protection, i.e., sampled voltage is obtained in output one partial pressure sampling resistor of termination, will be sampled by comparator
Voltage is compared with reference voltage and exports a fiducial value, is then exported by photoelectrical coupler to logic controller, so that
Controlling switch pipe realizes output over-voltage protection.Because the voltage that microwave oven supply power is exported is up to 4 kilovolts, therefore in existing scheme
Sampling resistor type selecting is difficult, power attenuation is big, and primary and secondary not altogether, adds photoelectrical coupler, circuit is complex in addition；Also
Need for comparator arrangement primary and secondary isolate accessory power supply, increase accessory power supply not only increase circuit complexity and into
This, under the occasion for having safety pitch requirements, is unfavorable for the miniaturization of power supply overall dimensions.
Utility model content
Main purpose of the present utility model is to propose a kind of microwave oven supply power circuit and micro-wave oven, it is intended to solve existing skill
The problem of art is present.
To achieve the above object, the utility model embodiment first aspect provides a kind of microwave oven supply power circuit, the electricity
Source circuit includes：
Current rectifying and wave filtering circuit, for the backward power conversion circuit of AC-input voltage rectifying and wave-filtering to be powered；
Power conversion circuit, the power conversion circuit includes power switch pipe, transformer and secondary output loop；Institute
The control end for stating power switch pipe is connected with the control module, the input of the power switch pipe and the primary
The second end connection of winding, the first end and the rectification of the output end of the power switch pipe and the primary winding
The output end connection of filter circuit；The transformer secondary output winding is connected with the input of the secondary output loop, described time
The output end of level output loop is used to power to microwave oven magnetic；
Voltage monitoring protection circuit, the input of the voltage monitoring protection circuit and the input of the power switch pipe
Connection；The voltage monitoring protection circuit is used for the voltage Vds for obtaining the power switch pipe；By voltage Vds by average
With voltage Vaver is obtained after partial pressure switch；Voltage Vaver is compared with set threshold voltage Vref, according to comparative result
Output control signal gives the control module；
The control module, for controlling the power switch pipe to close according to the control signal.
Further, the current rectifying and wave filtering circuit includes bridge rectifier and the first electric capacity, first electric capacity and institute
State cathode output end and the cathode output end connection of bridge rectifier；
The cathode output end of the bridge rectifier is connected with the first end of the primary winding；The bridge-type
The output end of the cathode output end of rectification circuit and the power switch pipe and be connected.
Further, the power circuit also includes a resonant capacitance, the resonant capacitance and the primary around
The first end of group and the connection of the second end.
Further, the power switch pipe is insulated gate bipolar transistor or metal oxide semiconductor field-effect
Pipe；
The control end is the grid of insulated gate bipolar transistor, and the input is insulated gate bipolar transistor pipe
Colelctor electrode, the output end be insulated gate bipolar transistor emitter stage；
Or the grid that the control end is metal oxide semiconductor field effect tube, the input is metal oxide
The drain electrode of semiconductor field, the output end is the source electrode of metal oxide semiconductor field effect tube.
Further, the secondary output loop is half-wave rectifying circuit or voltage doubling rectifing circuit.
Further, the voltage monitoring protection circuit includes average circuit, bleeder circuit and comparator；
The input of the average circuit is connected with the input of the power switch pipe, and the average circuit is used to obtain
The voltage Vds of the power switch pipe, and average voltage Vaver1 is obtained after voltage Vds is averagely changed；
The input of the bleeder circuit is connected with the output end of the average circuit, the output end of the bleeder circuit with
The first input end connection of the comparator；The bleeder circuit is used to obtain average voltage Vaver1 progress partial pressure after partial pressure
Voltage Vaver；
Second input of the comparator is used to input threshold voltage Vref, the output end of the comparator and the control
Molding block is connected；The comparator be used for the voltage Vaver after partial pressure and set threshold voltage Vref is compared, according to than
The control module is given compared with result output control signal.
Further, the average circuit includes first resistor and the second electric capacity；The bleeder circuit includes being connected in series
Second resistance and 3rd resistor；
One end of the first resistor is connected with the input of the power switch pipe, the other end of the first resistor with
One end of the second resistance and the connection of one end of second electric capacity, one end of the 3rd resistor and second electric capacity
The other end is connected to ground；The first of the other end of the second resistance and the other end of the 3rd resistor and the comparator is defeated
Enter end connection.
Further, the voltage monitoring protection circuit includes partial pressure average circuit and comparator；
The input of the partial pressure average circuit is connected with the input of the power switch pipe, the partial pressure average circuit
Output end be connected with the first input end of the comparator；The partial pressure average circuit is used to obtain the power switch pipe
Voltage Vds, and voltage Vaver will be obtained after voltage Vds partial pressures and average conversion；
Second input of the comparator is used to input threshold voltage Vref, the output end of the comparator and the control
Molding block is connected；The comparator is used to voltage Vaver being compared with set threshold voltage Vref, defeated according to comparative result
Go out control signal to the control module.
Further, the partial pressure average circuit includes the 3rd electric capacity and the 4th resistance being connected in series and the 5th electricity
Resistance；
One end of 4th resistance is connected with the input of the power switch pipe, the other end of the 4th resistance with
The first input end connection of one end of the 5th resistance, one end of the 3rd electric capacity and the comparator, the described 5th
The other end ground connection of the other end of resistance and the 3rd electric capacity.
In addition, to achieve the above object, the utility model embodiment second aspect provides a kind of micro-wave oven, the micro-wave oven
Including a kind of above-mentioned microwave oven supply power circuit.
Microwave oven supply power circuit and micro-wave oven that the utility model embodiment is provided, are entered by obtaining power switch tube voltage
Row conversion is compared, and is controlled power switch pipe to close according to comparative result, is realized output over-voltage protection function；Need not directly it adopt
Sample output voltage realizes output over-voltage protection, it is not necessary to increase photoelectrical coupler, circuit is simple, cost is low, is conducive to power supply
The miniaturization of overall dimensions.
Brief description of the drawings
Fig. 1 is the microwave oven supply power electrical block diagram of the utility model first embodiment；
Fig. 2 is the microwave oven supply power electrical block diagram of the utility model second embodiment；
Fig. 3 is the microwave oven supply power electrical block diagram of the utility model 3rd embodiment.
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that specific embodiment described herein is not used to limit this only to explain the utility model
Utility model.
Each embodiment of the utility model is realized referring now to accompanying drawing description.In follow-up description, using for
The suffix of such as " module ", " part " or " unit " of element is represented only for being conducive to explanation of the present utility model, itself
Not specific meaning.
It will be further appreciated that, the term that is used in the utility model specification and appended book " and/
Or " refer to any combinations of one or more of the associated item listed and be possible to combination, and including these groups
Close.
The description for being related to " first ", " second " etc. in the utility model is only used for describing purpose, and it is not intended that referring to
Show or imply its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", " are defined
At least one this feature can be expressed or be implicitly included to two " feature.In addition, the technical scheme between each embodiment can
To be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme occurs
It is conflicting or when can not realize it will be understood that the combination of this technical scheme is not present, also not in the guarantor of the utility model requirement
Within the scope of shield.
First embodiment
As shown in figure 1, the utility model first embodiment provides a kind of microwave oven supply power circuit, the power circuit includes：
Current rectifying and wave filtering circuit 10, for will be powered after AC-input voltage rectifying and wave-filtering to power conversion circuit 20.
In the present embodiment, AC-input voltage can be 220V civil powers, from input Vin inputs.
In the present embodiment, current rectifying and wave filtering circuit includes bridge rectifier (shown in the D1-D4 in figure) and the first electric capacity
Cathode output end and the cathode output end connection of C1, the first electric capacity C1 and bridge rectifier；
The cathode output end of bridge rectifier is connected with the first end of transformer T armature windings；Bridge rectifier
Cathode output end and power switch pipe T1 output end and be connected.
Power conversion circuit 20, power conversion circuit 20 includes power switch pipe T1, transformer T and secondary output loop
201。
Power switch pipe T1 control end (in accompanying drawing T1 1 shown in) is connected with control module 40, power switch pipe T1's
Input (in accompanying drawing T1 2 shown in) is connected with the second end of transformer T armature windings, and power switch pipe T1 output end is (attached
Figure T1 in 3 shown in) and the first end of transformer T armature windings be connected with the output end of current rectifying and wave filtering circuit 10；Transformer T times
Level winding is connected with the input of secondary output loop 201, and the output end vo ut of secondary output loop 201 is used for micro-wave oven magnetic
Keyholed back plate (not shown) is powered.
In one embodiment, power switch pipe T1 can be insulated gate bipolar transistor (Insulated Gate
Bipolar Transistor, IGBT)；
Control end is the grid of insulated gate bipolar transistor, and input is the current collection of insulated gate bipolar transistor pipe
Pole, output end is the emitter stage of insulated gate bipolar transistor.
In another embodiment, power switch pipe T1 can be metal oxide semiconductor field effect tube (Metal-
Oxide-Semiconductor Field-Effect Transistor,MOSFET)；
Control end is the grid of metal oxide semiconductor field effect tube, and input is metal oxide semiconductor field-effect
The drain electrode of pipe, output end is the source electrode of metal oxide semiconductor field effect tube.
In the present embodiment, secondary output loop 201 is half-wave rectifying circuit.Half-wave rectifying circuit include diode D5 and
3rd electric capacity C3.
Voltage monitoring protection circuit 30, the input of voltage monitoring protection circuit 30 connects with power switch pipe T1 input
Connect；Voltage monitoring protection circuit 30 is used for the voltage Vds for obtaining power switch pipe T1；Obtained after voltage Vds is averagely changed
Average voltage Vaver1；Average voltage Vaver1 progress partial pressure is obtained into the voltage Vaver after partial pressure；By the voltage after partial pressure
Vaver is compared with set threshold voltage Vref, according to comparative result output control signal to control module 40；Control module
40, for controlling power switch pipe T1 to close according to control signal.
In the present embodiment, voltage monitoring protection circuit 30 includes average circuit 301, bleeder circuit 302 and comparator
303；
In the present embodiment, average circuit 301 includes first resistor R1 and the second electric capacity C2.Bleeder circuit 302 includes string
Join the second resistance R2 and 3rd resistor R3 of connection.
First resistor R1 one end is connected with power switch pipe T1 input；The first resistor R1 other end and partial pressure electricity
The second resistance R2 on road 302 one end and the connection of the second electric capacity C2 one end；3rd resistor R3 one end and the second electric capacity C2's
The other end is connected to ground；The first input end of the second resistance R2 other end and the 3rd resistor R3 other end and comparator connects
Connect.
Average circuit 301 is used to obtaining the voltage Vds of power switch pipe, and is put down after voltage Vds is averagely changed
Equal voltage Vaver1.Specifically, the voltage Vp=Vout*Np/Ns on transformer T armature windings, the voltage Vds of power switch pipe
=Vin+Vp, average voltage Vaver1=Vds*Ton/Ts.Wherein Ton represents power switch pipe T1 ON time, and Ts is represented
Power switch pipe T1 switch periods.From above formula as can be seen that power switch pipe T1 voltage Vds is obtained, equal to indirect
Ground has got output voltage Vout.
Bleeder circuit 302 is used to average voltage Vaver1 progress partial pressure obtaining the average voltage Vaver after partial pressure.
Second input of comparator 303 is used to input threshold voltage Vref, the output end and control module of comparator 303
40 connections；Comparator 303 is used to the voltage Vaver after partial pressure and set threshold voltage Vref being compared, according to comparing knot
Fruit output control signal is to control module 40.
It should be noted that comparator 303 can be with phase comparator or anti-phase comparator.In Fig. 1, after partial pressure
Voltage Vaver be more than set threshold voltage Vref then output control signal to control module 40.In addition, the power supply of comparator 303
End and ground terminal connect power supply and ground respectively, and therefore not to repeat here.
Second embodiment
Refer to shown in Fig. 2, second embodiment from unlike first embodiment：Secondary output loop 201 is times repoussage
Current circuit.Voltage doubling rectifing circuit includes diode D51, D52, electric capacity C32 and C33.
In the present embodiment, (wherein k is the no-load voltage ratio Np/ of transformer to the voltage Vds=Vin+k*Vout/2 of power switch pipe
Ns), Vaver1=Vds*Ton/Ts=D*Vin+D*k*Vout/2 (wherein D=Ton/Ts).
In addition in transformer T two ends parallel connection one resonant capacitance C31, i.e. resonant capacitance C31 and primary winding
First end and the second end connection.
3rd embodiment
Refer to shown in Fig. 3,3rd embodiment from unlike second embodiment：Voltage monitoring protection circuit 30 includes dividing
Press average circuit (301,302) and comparator 303；
In the present embodiment, partial pressure average circuit (301,302) includes the 3rd electric capacity C21 and the be connected in series the 4th
Resistance R21 and the 5th resistance R22；
4th resistance R21 one end is connected with power switch pipe T1 input, the 4th resistance R21 other end and the 5th
The first input end connection of resistance R22 one end, the 3rd electric capacity C21 one end and comparator 303, the 5th resistance R22's is another
One end and the 3rd electric capacity C21 other end ground connection.
Partial pressure average circuit (301,302) is used to obtaining power switch pipe T1 voltage Vds, and by voltage Vds partial pressures
With voltage Vaver is obtained after average conversion；
Comparator 303 is used to voltage Vaver being compared with set threshold voltage Vref, is exported and controlled according to comparative result
Signal processed is to control module 40.
Fourth embodiment
The present embodiment provides a kind of micro-wave oven, and micro-wave oven includes microwave oven supply power circuit, is connected with microwave oven supply power circuit
Microwave oven magnetic.Microwave oven supply power circuit refers to first embodiment and/or second embodiment, and therefore not to repeat here.
Microwave oven supply power circuit and micro-wave oven that the utility model embodiment is provided, are entered by obtaining power switch tube voltage
Row conversion is compared, and is controlled power switch pipe to close according to comparative result, is realized output over-voltage protection function；Need not directly it adopt
Sample output voltage realizes output over-voltage protection, it is not necessary to increase photoelectrical coupler, circuit is simple, cost is low, is conducive to power supply
The miniaturization of overall dimensions.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property is included, so that process, method, article or device including a series of key elements not only include those key elements, and
And also including other key elements being not expressly set out, or also include for this process, method, article or device institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Also there is other identical element in process, method, article or the device of key element.
Preferred embodiment of the present utility model is these are only, the scope of the claims of the present utility model is not thereby limited, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical fields, are similarly included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of microwave oven supply power circuit, the power circuit includes：
Current rectifying and wave filtering circuit, for will be powered after AC-input voltage rectifying and wave-filtering to power conversion circuit；
Power conversion circuit, the power conversion circuit includes power switch pipe, transformer and secondary output loop；The work(
The control end of rate switching tube is connected with the control module, the input of the power switch pipe and the primary winding
The connection of the second end, first end and the rectifying and wave-filtering of the output end of the power switch pipe and the primary winding
The output end connection of circuit；The transformer secondary output winding is connected with the input of the secondary output loop, and the secondary is defeated
Going out the output end in loop is used to power to microwave oven magnetic；
Voltage monitoring protection circuit, the input of the voltage monitoring protection circuit connects with the input of the power switch pipe
Connect；The voltage monitoring protection circuit is used for the voltage Vds for obtaining the power switch pipe；By voltage Vds by average and
Voltage Vaver is obtained after partial pressure switch；Voltage Vaver is compared with set threshold voltage Vref, it is defeated according to comparative result
Go out control signal to the control module；
The control module, for controlling the power switch pipe to close according to the control signal.
2. a kind of microwave oven supply power circuit according to claim 1, it is characterised in that the current rectifying and wave filtering circuit includes bridge
Formula rectification circuit and the first electric capacity, the cathode output end and cathode output end of first electric capacity and the bridge rectifier connect
Connect；
The cathode output end of the bridge rectifier is connected with the first end of the primary winding；The bridge rectifier
The output end of the cathode output end of circuit and the power switch pipe and be connected.
3. a kind of microwave oven supply power circuit according to claim 1, it is characterised in that it is humorous that the power circuit also includes one
Shaken electric capacity, and the resonant capacitance is connected with the first end of the primary winding and the second end.
4. a kind of microwave oven supply power circuit according to claim 1, it is characterised in that the power switch pipe is insulated gate
Bipolar transistor or metal oxide semiconductor field effect tube；
The control end is the grid of insulated gate bipolar transistor, and the input is the current collection of insulated gate bipolar transistor
Pole, the output end is the emitter stage of insulated gate bipolar transistor；
Or the grid that the control end is metal oxide semiconductor field effect tube, the input is that metal oxide is partly led
The drain electrode of body FET, the output end is the source electrode of metal oxide semiconductor field effect tube.
5. a kind of microwave oven supply power circuit according to claim 1, it is characterised in that the secondary output loop is half-wave
Rectification circuit or voltage doubling rectifing circuit.
6. a kind of microwave oven supply power circuit according to claim 1, it is characterised in that the voltage monitoring protection circuit bag
Include average circuit, bleeder circuit and comparator；
The input of the average circuit is connected with the input of the power switch pipe, and the average circuit is used to obtain described
The voltage Vds of power switch pipe, and average voltage Vaver1 is obtained after voltage Vds is averagely changed；
The input of the bleeder circuit is connected with the output end of the average circuit, the output end of the bleeder circuit with it is described
The first input end connection of comparator；The bleeder circuit is used to average voltage Vaver1 progress partial pressure obtaining the electricity after partial pressure
Press Vaver；
Second input of the comparator is used to input threshold voltage Vref, the output end of the comparator and the control mould
Block is connected；The comparator is used to the voltage Vaver after partial pressure and set threshold voltage Vref being compared, according to comparing knot
Fruit output control signal gives the control module.
7. a kind of microwave oven supply power circuit according to claim 6, it is characterised in that the average circuit includes the first electricity
Resistance and the second electric capacity；The bleeder circuit includes the second resistance and 3rd resistor being connected in series；
One end of the first resistor is connected with the input of the power switch pipe, the other end of the first resistor with it is described
One end of second resistance and the connection of one end of second electric capacity, one end of the 3rd resistor and second electric capacity it is another
End is connected to ground；The first input end of the other end of the second resistance and the other end of the 3rd resistor and the comparator
Connection.
8. a kind of microwave oven supply power circuit according to claim 1, it is characterised in that the voltage monitoring protection circuit bag
Include partial pressure average circuit and comparator；
The input of the partial pressure average circuit is connected with the input of the power switch pipe, the partial pressure average circuit it is defeated
Go out end to be connected with the first input end of the comparator；The partial pressure average circuit is used for the voltage for obtaining the power switch pipe
Vds, and voltage Vaver will be obtained after voltage Vds partial pressures and average conversion；
Second input of the comparator is used to input threshold voltage Vref, the output end of the comparator and the control mould
Block is connected；The comparator is used to voltage Vaver being compared with set threshold voltage Vref, is exported and controlled according to comparative result
Signal processed gives the control module.
9. a kind of microwave oven supply power circuit according to claim 8, it is characterised in that the partial pressure average circuit includes the
Three electric capacity and the 4th resistance being connected in series and the 5th resistance；
One end of 4th resistance is connected with the input of the power switch pipe, the other end of the 4th resistance with it is described
The first input end connection of one end of the 5th resistance, one end of the 3rd electric capacity and the comparator, the 5th resistance
The other end and the 3rd electric capacity the other end ground connection.
10. a kind of micro-wave oven, it is characterised in that the micro-wave oven includes a kind of any described micro-wave oven electricity of claim 1-9
Source circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720348204.3U CN206585782U (en) | 2017-04-05 | 2017-04-05 | A kind of microwave oven supply power circuit and micro-wave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720348204.3U CN206585782U (en) | 2017-04-05 | 2017-04-05 | A kind of microwave oven supply power circuit and micro-wave oven |
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| Publication Number | Publication Date |
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| CN206585782U true CN206585782U (en) | 2017-10-24 |
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ID=60092604
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| CN201720348204.3U Active CN206585782U (en) | 2017-04-05 | 2017-04-05 | A kind of microwave oven supply power circuit and micro-wave oven |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106922044A (en) * | 2017-04-05 | 2017-07-04 | 深圳戴普森新能源技术有限公司 | A kind of microwave oven supply power circuit and micro-wave oven |
-
2017
- 2017-04-05 CN CN201720348204.3U patent/CN206585782U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106922044A (en) * | 2017-04-05 | 2017-07-04 | 深圳戴普森新能源技术有限公司 | A kind of microwave oven supply power circuit and micro-wave oven |
| CN106922044B (en) * | 2017-04-05 | 2023-09-01 | 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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