CN108282914A - Microwave oven supply power circuit and micro-wave oven - Google Patents
Microwave oven supply power circuit and micro-wave oven Download PDFInfo
- Publication number
- CN108282914A CN108282914A CN201810235864.XA CN201810235864A CN108282914A CN 108282914 A CN108282914 A CN 108282914A CN 201810235864 A CN201810235864 A CN 201810235864A CN 108282914 A CN108282914 A CN 108282914A
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- resistance
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- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims description 28
- 230000005611 electricity Effects 0.000 claims description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- 230000005669 field effect Effects 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 11
- 238000009730 filament winding Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/664—Aspects related to the power supply of the microwave heating apparatus
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
- H05B6/687—Circuits for monitoring or control for cooking
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention discloses a kind of microwave oven supply power circuit and micro-wave oven, the microwave oven supply power circuit includes sequentially connected input terminal current rectifying and wave filtering circuit, switching circuit, transformer and output end rectification circuit；Microwave oven supply power circuit further includes start-up circuit and compensation circuit；The start-up circuit is for starting main control chip；The compensation circuit is used to compensate the operating current of the main control chip.It is in series with thermistor in start-up circuit of the present invention, the Wen Sheng generated with start-up circuit electric current resistance values after more than certain temperature increase sharply, and then starting current is made to be reduced rapidly；The temperature for reducing start-up resistor achievees the purpose that protect start-up resistor and promotes power supply overall performance.
Description
Technical field
The present invention relates to micro-wave oven technical field more particularly to a kind of microwave oven supply power circuits and micro-wave oven.
Background technology
Micro-wave oven is with its efficiency height, homogeneous heating in the unit interval and the favor for receiving more and more users.With biography
The microwave oven supply power of system is compared, and microwave oven supply power uses Switching Power Supply that power is continuously adjusted in a certain range instead of defeated
Going out power can not continuously adjustable Industrial Frequency Transformer.
In the implementation of the present invention, inventor has found that the prior art has the following problems：Existing micro-wave oven switch electricity
Start-up circuit in source has that start-up resistor temperature is high, power deratng is big, cost is higher and volume is larger, such as transformation
Device is being led often, and the temperature of start-up resistor will increase rapidly, and aging and is burnt rapidly in a short time.
Invention content
The main purpose of the embodiment of the present invention is to propose a kind of microwave oven supply power circuit and micro-wave oven, it is intended to solve existing
The problem of with the presence of technology.
To achieve the above object, the embodiment of the present invention provides a kind of microwave oven supply power circuit, the microwave oven supply power circuit
Including sequentially connected input terminal current rectifying and wave filtering circuit, switching circuit, transformer and output end rectification circuit；
The switching circuit includes the power switch tube being connected in series with and resonant capacitance；
The transformer includes armature winding, auxiliary winding, Filament Winding and high-voltage winding；The armature winding with it is described
Resonant capacitance is connected in parallel, and the Filament Winding is connected with magnetron heater, and the high-voltage winding passes through the output end rectification
Circuit is connect with anode of magnetron；
The microwave oven supply power circuit further includes start-up circuit and compensation circuit；
The start-up circuit is for starting main control chip；One end of the start-up circuit and input terminal rectifying and wave-filtering electricity
The output end on road connects, and the other end of the start-up circuit is connect with the main control chip；The start-up circuit includes the first electricity
Resistance, thermistor and second resistance；The first resistor and the thermistor are connected in series with composition series arm, and described
Two resistance are connected in parallel with the series arm；
One end of the compensation circuit is connect with one end of the auxiliary winding, the other end ground connection of the auxiliary winding,
The other end of the compensation circuit is connect with the main control chip；The compensation circuit is used to compensate the work of the main control chip
Electric current.
Optionally, the first resistor is Chip-R.
Optionally, the compensation circuit includes 3rd resistor, capacitance and diode；
The anode of the diode is connect with one end of the auxiliary winding, the cathode of the diode and third electricity
One end of resistance is connected with one end of the capacitance, and the other end of the 3rd resistor is connect with the main control chip, the auxiliary
The other end of the other end of winding and the capacitance is grounded.
Optionally, the microwave oven supply power circuit further includes discharge circuit；
The discharge circuit includes the 4th resistance, the 5th resistance and the first varistor；5th resistance and described
First varistor is connected in parallel composition parallel branch, an output end of the parallel branch and the output end rectification circuit
It is connected in series with；4th resistor coupled in parallel is connected between two output ends of the output end rectification circuit.
Optionally, the input terminal current rectifying and wave filtering circuit includes bridge rectifier and filter circuit；
The input terminal of the bridge rectifier is connected to AC power, and the filter circuit is connected to the bridge rectifier
The output end of circuit.
Optionally, the microwave oven supply power circuit further includes the second varistor, and second varistor is connected on described
Between two input terminals of input terminal current rectifying and wave filtering circuit.
Optionally, the output end rectification circuit is half-wave rectifying circuit or voltage doubling rectifing circuit.
Optionally, the microwave oven supply power circuit further includes the 6th resistance, the 7th resistance, two pole of the 8th resistance and voltage stabilizing
Pipe；
The control terminal of the power switch tube receives drive signal by the 6th resistance；The power switch tube it is defeated
Enter end to connect with the resonant capacitance；The output end of the power switch tube passes through the 8th resistance eutral grounding；7th electricity
Resistance and the zener diode are connected in parallel between the control terminal and output end of the power switch tube.
Optionally, the power switch tube is insulated gate bipolar transistor or metal oxide semiconductor field-effect
Pipe；
The control terminal is the grid of insulated gate bipolar transistor, and the input terminal is insulated gate bipolar transistor
Collector, the output end are the emitter of insulated gate bipolar transistor；
Or the grid that the control terminal is metal oxide semiconductor field effect tube, the input terminal are metal oxide
The drain electrode of semiconductor field, the output end are the source electrode of metal oxide semiconductor field effect tube.
In addition, to achieve the above object, the embodiment of the present invention provides a kind of micro-wave oven, and the micro-wave oven includes above-mentioned micro-
Wave stove power circuit.
Microwave oven supply power circuit and micro-wave oven provided in an embodiment of the present invention are in series with thermistor in start-up circuit,
The Wen Sheng generated with start-up circuit electric current resistance values after more than certain temperature increase sharply, and then starting current is made to subtract rapidly
It is small；The temperature for reducing start-up resistor achievees the purpose that protect start-up resistor and promotes power supply overall performance.
Description of the drawings
Fig. 1 is the microwave oven supply power electrical block diagram of the embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The each embodiment of the present invention 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 present invention, and there is no special for itself
Fixed meaning.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combinations and all possible combinations of one or more of associated item listed, and includes these combinations.
First embodiment：
As shown in Figure 1, first embodiment of the invention provides a kind of microwave oven supply power circuit, the microwave oven supply power circuit packet
Include sequentially connected input terminal current rectifying and wave filtering circuit, switching circuit, transformer and output end rectification circuit.
In the present embodiment, the input terminal current rectifying and wave filtering circuit includes bridge rectifier (shown in the D1-D4 in figure)
With filter circuit (shown in the filter capacitor C1 and C2 and filter inductance L1 in figure)；
The input terminal of the bridge rectifier is connected to AC power (attached drawing is not shown), and the filter circuit is connected to
The output end of the bridge rectifier.
Filter circuit can be made of filter capacitor and/or filter inductance, and specifically this is not restricted.
In one embodiment, the microwave oven supply power circuit further includes varistor ZR1, the varistor ZR1
It is connected between two input terminals (shown in L, R in figure) of the input terminal current rectifying and wave filtering circuit.
In the present embodiment, the switching circuit includes the power switch tube Q1 being connected in series with and resonant capacitance C3.
The power switch tube Q1 can be insulated gate bipolar transistor or metal oxide semiconductor field effect tube；
If power switch tube Q1 is insulated gate bipolar transistor, control terminal is the grid of insulated gate bipolar transistor
Pole, input terminal are the collector of insulated gate bipolar transistor, and output end is the emitter of insulated gate bipolar transistor；
If power switch tube Q1 is metal oxide semiconductor field effect tube, control terminal is MOS field
The grid of effect pipe, input terminal are the drain electrode of metal oxide semiconductor field effect tube, and output end is metal-oxide semiconductor (MOS)
The source electrode of field-effect tube.
In one embodiment, the microwave oven supply power circuit further includes resistance R6, resistance R7, resistance R8 and voltage stabilizing
Diode ZR4.
The control terminal of the power switch tube receives PWM drive signal by the resistance R6；The power switch tube
Input terminal is connect with the resonant capacitance C3；The output end of the power switch tube is grounded by the resistance R8；The resistance
R7 and the zener diode ZR4 are connected in parallel between the control terminal and output end of the power switch tube.
In the present embodiment, the transformer T1 includes armature winding T11, auxiliary winding T12, Filament Winding T22 and height
Press winding T21；The armature winding T11 is connected in parallel with the resonant capacitance C3, the Filament Winding T22 and magnetron heater
(attached drawing is not shown) is connected, and the high-voltage winding T21 is connected by output end rectification circuit and anode of magnetron (attached drawing is not shown)
It connects.
The output end rectification circuit is half-wave rectifying circuit or voltage doubling rectifing circuit (D6, D7, C4 and C5 in figure
It is shown).
In one embodiment, the microwave oven supply power circuit further includes discharge circuit；
The discharge circuit includes resistance R4, resistance R5 and varistor ZR3；The resistance R5 and the varistor
ZR3 is connected in parallel composition parallel branch, and the parallel branch and an output end of the output end rectification circuit are connected in series with；
The resistance R4 is connected in parallel between two output ends of the output end rectification circuit.
The microwave oven supply power circuit further includes start-up circuit and compensation circuit；
The start-up circuit is for starting main control chip (attached drawing is not shown)；One end of the start-up circuit and the input
The output end connection of current rectifying and wave filtering circuit, the other end VCC of the start-up circuit is held to be connect with the main control chip；
In the present embodiment, the start-up circuit includes resistance R1, thermistor (PTC) ZR2 and resistance R2；The electricity
The resistance R1 and thermistor ZR2 is connected in series with composition series arm, and the resistance R2 is connected in parallel with the series arm；Electricity
It can be Chip-R to hinder R1.
One end of the compensation circuit is connect with one end of the auxiliary winding T12, the other end of the auxiliary winding T12
Ground connection, the other end of the compensation circuit are connect with main control chip (attached drawing is not shown)；The compensation circuit is described for compensating
The operating current of main control chip.
In the present embodiment, the compensation circuit includes resistance R3, capacitance C6 and diode D5；
The anode of the diode D5 is connect with one end of the auxiliary winding T12, the cathode of the diode D5 and institute
The one end for stating resistance R3 is connected with one end of the capacitance C6, and the other end of the resistance R3 is connect with the main control chip, institute
State the other end of auxiliary winding T12 and the other end ground connection of the capacitance C6.
For the ease of understanding the present embodiment, the course of work of microwave oven supply power circuit is illustrated below：
After power supply electrifying, the start-up circuit that is made of R1, R2 and varistor ZR3 by VCC deactivation main control chips,
After transformer T1 starts to work, immediately by the operating current of the timely compensation chips of auxiliary winding T12.Due to being gone here and there in start-up circuit
It is associated with PTC resistor, the Wen Sheng which generates with the electric current of start-up circuit resistance values after more than certain temperature increase sharply
Several times are greatly lowered the temperature of start-up resistor R1 in this way so that starting current is reduced rapidly, and reach protection and start electricity
It hinders R1 and promotes the purpose of power supply overall performance.
When transformer T1 is stopped, the current branch by bypassing R2 makes master control chip work normally.Both ensured
Main control chip, which is normally handled, executes necessary task, in turn ensures that minimum is accomplished in calorific value, can also hardly increase cost.
In a kind of application scenarios, the electric current of start-up resistor R1 is 3.03mA, and surface temperature when work is 75 degrees Celsius.
PTC resistor surface temperature is 95 degrees Celsius.Since the power of R1 reduces, so that it may to use Chip-R, can improve in this way
Processing efficiency can also reduce cost.
Microwave oven supply power circuit provided in this embodiment is in series with thermistor in start-up circuit, with start-up circuit electricity
Raw Wen Sheng resistance values after more than certain temperature of miscarrying increase sharply, and then starting current is made to be reduced rapidly；Reduce startup electricity
The temperature of resistance achievees the purpose that protect start-up resistor and promotes power supply overall performance
Second embodiment：
Second embodiment of the invention provides a kind of micro-wave oven, and micro-wave oven includes the microwave oven supply power electricity described in first embodiment
Road.
Microwave oven supply power circuit can refer to foregoing teachings, and therefore not to repeat here.
Micro-wave oven provided in this embodiment is in series with thermistor in start-up circuit, is generated with start-up circuit electric current
Wen Sheng resistance values after more than certain temperature increase sharply, and then starting current is made to be reduced rapidly；The temperature of start-up resistor is reduced,
Achieve the purpose that protect start-up resistor and promotes power supply overall performance.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of microwave oven supply power circuit, which is characterized in that the microwave oven supply power circuit includes that sequentially connected input terminal is whole
Flow filter circuit, switching circuit, transformer and output end rectification circuit；
The switching circuit includes the power switch tube being connected in series with and resonant capacitance；
The transformer includes armature winding, auxiliary winding, Filament Winding and high-voltage winding；The armature winding and the resonance
Capacitance is connected in parallel, and the Filament Winding is connected with magnetron heater, and the high-voltage winding passes through the output end rectification circuit
It is connect with anode of magnetron；
The microwave oven supply power circuit further includes start-up circuit and compensation circuit；
The start-up circuit is for starting main control chip；One end of the start-up circuit and the input terminal current rectifying and wave filtering circuit
Output end connects, and the other end of the start-up circuit is connect with the main control chip；The start-up circuit includes first resistor, heat
Quick resistance and second resistance；The first resistor and the thermistor are connected in series with composition series arm, second electricity
Resistance is connected in parallel with the series arm；
One end of the compensation circuit is connect with one end of the auxiliary winding, the other end ground connection of the auxiliary winding, described
The other end of compensation circuit is connect with the main control chip；The compensation circuit is used to compensate the work electricity of the main control chip
Stream.
2. microwave oven supply power circuit according to claim 1, which is characterized in that the first resistor is Chip-R.
3. microwave oven supply power circuit according to claim 1, which is characterized in that the compensation circuit include 3rd resistor,
Capacitance and diode；
The anode of the diode is connect with one end of the auxiliary winding, the cathode of the diode and the 3rd resistor
One end is connected with one end of the capacitance, and the other end of the 3rd resistor is connect with the main control chip, the auxiliary winding
The other end and the capacitance the other end ground connection.
4. microwave oven supply power circuit according to claim 1, which is characterized in that the microwave oven supply power circuit further includes putting
Circuit；
The discharge circuit includes the 4th resistance, the 5th resistance and the first varistor；5th resistance and described first
Varistor is connected in parallel composition parallel branch, and the parallel branch is connected with an output end of the output end rectification circuit
Connection；4th resistor coupled in parallel is connected between two output ends of the output end rectification circuit.
5. microwave oven supply power circuit according to claim 1, which is characterized in that the input terminal current rectifying and wave filtering circuit includes
Bridge rectifier and filter circuit；
The input terminal of the bridge rectifier is connected to AC power, and the filter circuit is connected to the bridge rectifier
Output end.
6. microwave oven supply power circuit according to claim 1, which is characterized in that the microwave oven supply power circuit further includes
Two varistors, second varistor are connected between two input terminals of the input terminal current rectifying and wave filtering circuit.
7. microwave oven supply power circuit according to claim 1, which is characterized in that the output end rectification circuit is that half-wave is whole
Current circuit or voltage doubling rectifing circuit.
8. microwave oven supply power circuit according to claim 1, which is characterized in that the microwave oven supply power circuit further includes
Six resistance, the 7th resistance, the 8th resistance and zener diode；
The control terminal of the power switch tube receives drive signal by the 6th resistance；The input terminal of the power switch tube
It is connect with the resonant capacitance；The output end of the power switch tube passes through the 8th resistance eutral grounding；7th resistance and
The zener diode is connected in parallel between the control terminal and output end of the power switch tube.
9. microwave oven supply power circuit according to claim 8, which is characterized in that the power switch tube is insulated gate bipolar
Transistor npn npn or metal oxide semiconductor field effect tube；
The control terminal is the grid of insulated gate bipolar transistor, and the input terminal is the current collection of insulated gate bipolar transistor
Pole, the output end are the emitter of insulated gate bipolar transistor；
Or the grid that the control terminal is metal oxide semiconductor field effect tube, the input terminal are that metal oxide is partly led
The drain electrode of body field-effect tube, the output end are the source electrode of metal oxide semiconductor field effect tube.
10. a kind of micro-wave oven, which is characterized in that the micro-wave oven includes any microwave oven supply power electricity of claim 1-9
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810235864.XA CN108282914B (en) | 2018-03-21 | 2018-03-21 | Microwave oven power supply circuit and microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810235864.XA CN108282914B (en) | 2018-03-21 | 2018-03-21 | Microwave oven power supply circuit and microwave oven |
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| Publication Number | Publication Date |
|---|---|
| CN108282914A true CN108282914A (en) | 2018-07-13 |
| CN108282914B CN108282914B (en) | 2024-06-21 |
Family
ID=62810111
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810235864.XA Active CN108282914B (en) | 2018-03-21 | 2018-03-21 | Microwave oven power supply circuit and microwave oven |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109661056A (en) * | 2018-12-17 | 2019-04-19 | 京信通信系统（中国）有限公司 | A kind of microwave equipment |
| CN111446872A (en) * | 2020-04-01 | 2020-07-24 | 石家庄通合电子科技股份有限公司 | Transformer transformation ratio adjustable wide-range constant power output switching circuit |
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| CN111446872A (en) * | 2020-04-01 | 2020-07-24 | 石家庄通合电子科技股份有限公司 | Transformer transformation ratio adjustable wide-range constant power output switching circuit |
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| Publication number | Publication date |
|---|---|
| CN108282914B (en) | 2024-06-21 |
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