CN109510460B - Microwave oven power supply circuit and microwave oven - Google Patents
Microwave oven power supply circuit and microwave oven Download PDFInfo
- Publication number
- CN109510460B CN109510460B CN201910027715.9A CN201910027715A CN109510460B CN 109510460 B CN109510460 B CN 109510460B CN 201910027715 A CN201910027715 A CN 201910027715A CN 109510460 B CN109510460 B CN 109510460B
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- 238000001914 filtration Methods 0.000 claims abstract description 38
- 238000002955 isolation Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 15
- 238000005070 sampling Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The application discloses a microwave oven power supply circuit and a microwave oven, wherein the microwave oven power supply circuit comprises a rectifying and filtering circuit, an isolation circuit, a non-isolation voltage doubling circuit and a filtering circuit which are sequentially connected; the rectification filter circuit rectifies and filters the alternating current power supply and outputs the rectified and filtered direct current voltage; the isolation circuit isolates the rectifying and filtering circuit and the non-isolated voltage doubling circuit; the non-isolated voltage doubling circuit boosts the direct-current voltage output by the rectifying and filtering circuit to obtain high-voltage direct-current voltage; the output filter circuit performs isolation filtering on the high-voltage direct-current voltage output by the non-isolation voltage doubling circuit; the isolated and filtered high-voltage direct-current voltage is used for supplying power to a magnetron of the microwave oven. The non-isolation voltage doubling circuit is used for boosting, and a power frequency or high-frequency transformer is not used for boosting and isolating, so that the problems of high cost and large loss of the transformer are avoided, the cost is reduced, and the loss is reduced.
Description
Technical Field
The application relates to the technical field of microwave ovens, in particular to a microwave oven power supply circuit and a microwave oven.
Background
Microwave ovens are becoming popular to many users because of their high energy efficiency and uniform heating per unit time. Compared with the traditional microwave oven power supply, the microwave oven power supply adopts a switching power supply with continuously adjustable power within a certain range to replace a power frequency transformer with output power which cannot be continuously adjusted.
When the microwave oven is in operation, a DC high voltage of about 4200V is required to be supplied to the internal magnetron. The current scheme for generating the direct current high voltage mainly comprises two types of power frequency boosting and high frequency boosting. The power frequency boosting scheme needs to use a power frequency transformer for boosting and mains isolation, and the high frequency boosting scheme needs to use a high frequency transformer for boosting and mains isolation. However, both the power frequency transformer and the high frequency transformer have the defects of high cost and large loss.
Disclosure of Invention
The main aim of the application is to provide a microwave oven power supply circuit and a microwave oven, which aim at solving the problems of high cost and large loss of the existing microwave oven that the existing microwave oven is boosted by using a power frequency transformer or a high frequency transformer and is isolated from commercial power.
In order to achieve the above purpose, an embodiment of the present application provides a power supply circuit of a microwave oven, where the power supply circuit of the microwave oven includes a rectifying and filtering circuit, an isolation circuit, a non-isolation voltage doubling circuit, and a filtering circuit that are sequentially connected;
the rectification filter circuit is used for rectifying and filtering the alternating current power supply and outputting direct current voltage after rectification and filtering;
the isolation circuit is used for isolating the rectifying and filtering circuit and the non-isolated voltage doubling circuit;
the non-isolation voltage doubling circuit is used for boosting the direct-current voltage output by the rectifying and filtering circuit to obtain high-voltage direct-current voltage;
the output filter circuit is used for carrying out isolation filtering on the high-voltage direct-current voltage output by the non-isolation voltage doubling circuit; the isolated and filtered high-voltage direct-current voltage is used for supplying power to a magnetron of the microwave oven.
In addition, in order to achieve the above object, an embodiment of the present application provides a microwave oven including the above microwave oven power supply circuit.
The microwave oven power supply circuit and the microwave oven provided by the embodiment of the application boost through the non-isolation voltage doubling circuit, and do not use the power frequency or high-frequency transformer to boost and isolate, so that the problems of high cost and large loss of the transformer are avoided, the cost is reduced, and the loss is reduced.
Drawings
FIG. 1 is a schematic diagram of a microwave oven power supply main power loop using an industrial frequency boost scheme;
FIG. 2 is a schematic diagram of a main power loop of a microwave oven power supply using a high frequency boost scheme;
FIG. 3 is a schematic diagram of the integral insulation structure associated with a power frequency boost microwave oven;
FIG. 4 is a schematic diagram of the overall insulation structure associated with a high frequency boost microwave oven;
fig. 5 is a schematic diagram of a power circuit of a microwave oven according to a first embodiment of the present application;
fig. 6 is a schematic diagram of another structure of a power circuit of a microwave oven according to a first embodiment of the present application;
fig. 7 is a schematic diagram of an exemplary structure of a power supply circuit of a microwave oven according to an embodiment of the present application;
fig. 8 is a schematic diagram of another exemplary structure of a power supply circuit of a microwave oven according to an embodiment of the present application;
fig. 9 is a schematic diagram of a first structure of a boost circuit of a power supply circuit of a microwave oven according to an embodiment of the present application;
fig. 10 is a schematic diagram of a second structure of a boost circuit of a power supply circuit of a microwave oven according to an embodiment of the present application;
FIG. 11 is a third schematic diagram of a booster circuit of a microwave oven power supply circuit according to an embodiment of the present application;
fig. 12 is a schematic view of a microwave oven according to a second embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Various embodiments for implementing the present application will now be described with reference to the accompanying drawings. In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present application, and are not of specific significance per se.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
First embodiment:
to better illustrate this embodiment, the following description is made with reference to fig. 1-4 for a prior art power frequency boost and high frequency boost scheme:
FIG. 1 is a schematic diagram of a main power loop of a microwave oven power supply using an industrial frequency boost scheme that boosts mains (220V/50 Hz or 110V/60 Hz) to 4200V using an industrial frequency transformer T and a voltage doubler rectifier circuit. In the scheme, the power frequency transformer T is wound by adopting a silicon steel sheet and a lead, and the transformer is large in size and weight (generally more than 2 kg) and high in loss due to low working frequency.
Fig. 2 is a schematic diagram of a main power circuit of a microwave oven power supply using a high frequency boosting scheme, which generates 4200V high voltage using a high frequency transformer T1 and a voltage doubler rectifier circuit, by rectifying and filtering the mains supply, then converting the mains supply into high frequency voltage current through a half bridge or single tube switching circuit of a high frequency switch, and boosting the voltage through the high frequency transformer T1. In the scheme, the switching frequency of the high-frequency switching circuit is usually larger than 20KHz, the high-frequency transformer T1 is generally wound by using a ferrite core and a wire, and the volume and the weight of the transformer are smaller due to low working frequency, but the winding process is complex, the cost is high, the internal loss is large, and the heating is serious.
The power frequency transformer or the high frequency transformer has a boosting function and also has a function of isolating commercial power. Because the metal shell of the magnetron is one of the electrodes and is directly fixed on the microwave oven cavity, and the microwave oven cavity and the metal shell are conductive, if no transformer is isolated, the commercial power sequentially passes through the magnetron power supply circuit, the magnetron shell and the microwave oven cavity to reach the microwave oven shell, and when a person touches the microwave oven, the microwave oven shell and the ground are communicated through the human body to form a loop, so that electric shock accidents occur.
There are two kinds of integral insulation schemes matched with a microwave oven using a transformer for boosting, fig. 3 is a schematic diagram of integral insulation structure matched with a power frequency boosting microwave oven, and fig. 4 is a schematic diagram of integral insulation structure matched with a high frequency boosting microwave oven. As can be seen from fig. 3 and 4, the magnetron metal housing of the conventional microwave oven, the microwave oven metal cavity and the microwave oven housing are electrically connected (in the figures, the conductive connection is a metal connection of various forms), and are connected to the mains supply in a protective manner, and the electrical isolation scheme is mainly implemented by a transformer (shown as T in fig. 3 and 4).
However, both the power frequency transformer and the high frequency transformer have the defects of high cost and large loss.
Based on the defects of the scheme, as shown in fig. 5, the first embodiment of the application provides a microwave oven power supply circuit, which comprises a rectifying and filtering circuit 11, an isolating circuit 12, a non-isolating voltage doubling circuit 13 and an output filtering circuit 14 which are sequentially connected.
The rectifying and filtering circuit 11 is configured to rectify and filter an ac power supply, and output a rectified and filtered dc voltage.
The isolation circuit 12 is configured to isolate the rectifying and filtering circuit 11 from the non-isolated voltage doubling circuit 13.
The non-isolated voltage doubling circuit 13 is configured to boost the dc voltage output by the rectifying and filtering circuit 11 to obtain a high-voltage dc voltage.
In the present embodiment, the non-isolated voltage doubling circuit 13 includes a driving circuit 131 and a plurality of cascaded voltage boosting circuits 132;
the cascaded boost circuits 132 are used for boosting the direct-current voltage output by the rectifying and filtering circuit 11;
the driving circuit 131 is configured to drive the cascaded plurality of boost circuits 132.
The output filter circuit 14 is configured to perform isolation filtering on the high-voltage dc voltage output by the non-isolation voltage doubling circuit 13; the isolated and filtered high-voltage direct-current voltage is used for supplying power to a magnetron of the microwave oven.
Referring to fig. 6, in one embodiment, a bus voltage adjusting circuit 120 is further included between the rectifying and filtering circuit 11 and the isolating circuit 12;
the bus voltage adjustment circuit 120 is configured to adjust the dc voltage output from the rectifying and filtering circuit 11.
For a better illustration of the microwave oven power circuit, the following description is provided in connection with fig. 7-11:
as shown in fig. 7, the rectifying and filtering circuit 11 includes a diode rectifier bridge and a filter capacitor. Filter capacitor->The positive electrode output end and the negative electrode output end of the diode rectifier bridge are connected in parallel. Filter capacitor->Either small capacity capacitors or large capacity capacitors may be employed.
The isolation circuit 12 employs an inductanceIsolating, inductance->And the positive electrode output end of the diode rectifier bridge is connected in series.
A bus voltage adjustment circuit 120 may also be connected between the rectifying and filtering circuit 11 and the isolation circuit 12. The bus voltage adjusting circuit 120 can perform a bus voltage adjusting function, so that the circuit can adapt to wider input voltage, and meanwhile, the amplitude and the waveform of the voltage waveform output by the rectifying and filtering circuit 11 can be adjusted, so that the subsequent boosting operation of the non-isolated voltage doubling circuit 13 is facilitated.
As shown in fig. 8, the bus voltage adjustment circuit 120 includes an inductorPower switch tube->Diode->Capacitance->；
The inductorIs connected to the positive output of the rectifying and filtering circuit 11 (i.e. diode rectifier bridge), the inductance +.>The other end of (2) and the power switch tube +.>Is connected to the input of the diode and the diode>Is connected with the anode of the power switch tube>Is connected to the output of (c) and the capacitor->Is connected to the negative output of the rectifying and filtering circuit 11, i.e. a diode rectifier bridge, said diode +.>Is associated with the capacitor->Is connected with the other end of the power switch tube>The control terminal of (a) is used for receiving the driving signal.
As shown in fig. 7 or 8, in one embodiment, each boost circuit 132 includes a capacitorDiodePower switch tube->Diode->Resistance->(wherein->1, 2..n.,;
the capacitorIs connected with one end of the power switch tube>Is connected to the input of the diode and the diode>Is connected with the anode of the capacitor->Is connected with the other end of the diode->Is connected with the anode of the power switch tube>Through said resistor +.>And the diode->Is connected with the cathode of the power switch tube>The control terminal of (a) is used for receiving the driving signal.
As shown in fig. 9, in one embodiment, each boost circuit 132 includes a power switch tubeDiodeDiode->Capacitance->(wherein->1, 2..n.,;
the power switch tubeIs connected to the input of the diode>Is connected with the anode of the power switch tube>Is associated with the output of the capacitor>Is to be connected to the first terminal of the diode +.>Is connected to the anode of the diode +.>Is associated with the capacitor->Is connected with the other end of the power switch tube>The control terminal of (a) is used for receiving the driving signal.
As shown in fig. 10, in one embodiment, each boost circuit 132 includes a power switch tubeDiode->Inductance->And capacitance->(wherein->1, 2..n.,;
the power switch tubeIs connected to the input of the diode>Is connected to the anode of the diode +.>Is associated with the capacitor->Is connected with one end of the power switch tube>Is associated with the inductance->And the capacitance->Is connected with the other end of the power switch tube>The control terminal of (a) is used for receiving the driving signal.
In another embodiment, as shown in FIG. 11, each boost circuit 132 includes a power switch tubeDiode->Inductance->And capacitance->(wherein->1, 2..n.,;
the power switch tubeIs associated with the inductance->And the capacitance->Is connected with one end of the power switch tube>Is connected to the output of the diode>Is connected with the cathode of the capacitor->Is connected with the other end of the diode->Is connected with the anode of the power switch tube>The control terminal of (a) is used for receiving the driving signal.
Note that, the power switching transistor in each of the above embodiments may be a MOS transistor or an IGBT. As shown in fig. 7 or fig. 8, the power switch tube is a MOS tube, the input end of the power switch tube is the drain electrode of the MOS tube, and the input end of the power switch tube is the source electrode of the MOS tube.
Referring to fig. 7 again, the input end of the driving circuit 131 is used for obtaining a voltage signal and a current signal. The voltage signal comprises、/>、/>，/>By->、/>The sampling circuit is sampled to obtain ∈>By->、/>The sampling circuit is sampled to obtain ∈>Is a voltage signal given by the temperature sensing circuit. The current signal comprises->、/>，/>Through a current sampling resistor->Sampling to get->Through a current sampling resistor->Sampling to obtain the product. Current sampling resistor->Andare illustrative and they may be connected in series at any position where an input current and an output current can be measured. The output end of the driving circuit 131 is used for driving a power switch tube and filament control in the booster circuit 132. Fig. 8 differs from fig. 7 in that the voltage signal at the input of the driving circuit 131 also comprises +.>、/>。/>By->、/>The sampling circuit is sampled to obtain ∈>Is obtained by detecting the electric leakage of an alternating current power supply.
The microwave oven power supply circuit provided by the embodiment boosts through the non-isolation voltage doubling circuit, and does not use a power frequency or high-frequency transformer for boosting and isolation, so that the problems of high cost and large loss of the transformer are avoided, the cost is reduced, and the loss is reduced.
Second embodiment:
a second embodiment of the present application provides a microwave oven, which includes the microwave oven power circuit of the first embodiment.
The microwave oven power circuit may refer to the foregoing, and will not be described herein.
Referring to fig. 12, the metal cavity of the microwave oven is connected with the casing in a non-conductive manner, and the metal cavity of the microwave oven is connected with the ground. Fig. 12 is a new electrical isolation scheme, compared with the schemes of fig. 3 and 4, to ensure electrical safety. The novel electrical isolation scheme has the advantage that the transformer is not needed to be used for isolation in the power circuit, so that the cost of the whole scheme is reduced, and the electricity consumption is reduced.
The microwave oven provided by the embodiment is boosted by the non-isolation voltage doubling circuit, and the power frequency or high-frequency transformer is not used for boosting and isolating, so that the problems of high cost and large loss of the transformer are avoided, the cost is reduced, and the loss is reduced.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (5)
1. The microwave oven power supply circuit is characterized by comprising a rectifying and filtering circuit, an isolating circuit, a non-isolating voltage doubling circuit and an output filtering circuit which are connected in sequence;
the rectification filter circuit is used for rectifying and filtering the alternating current power supply and outputting direct current voltage after rectification and filtering;
the isolation circuit is used for isolating the rectifying and filtering circuit and the non-isolated voltage doubling circuit;
the non-isolation voltage doubling circuit is used for boosting the direct-current voltage output by the rectifying and filtering circuit to obtain high-voltage direct-current voltage;
the output filter circuit is used for carrying out isolation filtering on the high-voltage direct-current voltage output by the non-isolation voltage doubling circuit; the isolated and filtered high-voltage direct-current voltage is used for supplying power to a magnetron of the microwave oven;
the non-isolation voltage doubling circuit comprises a driving circuit and a plurality of cascaded boost circuits;
the cascaded boost circuits are used for boosting the direct-current voltage output by the rectification filter circuit;
the driving circuit is used for driving the cascaded multiple boosting circuits;
each boost circuit comprises a second capacitor, a second diode, a second power switch tube, a third diode and a first resistor; one end of the second capacitor is connected with the input end of the second power switch tube and the anode of the second diode, the other end of the second capacitor is connected with the anode of the third diode, the output end of the second power switch tube is connected with the cathode of the third diode through the first resistor, and the control end of the second power switch tube is used for receiving a driving signal; or,
each boost circuit comprises a third power switch tube, a fourth diode, a fifth diode and a third capacitor; the input end of the third power switch tube is connected with the anode of the fourth diode, the output end of the third power switch tube is connected with one end of the third capacitor and the anode of the fifth diode, the cathode of the fourth diode is connected with the other end of the third capacitor, and the control end of the third power switch tube is used for receiving a driving signal; or,
each boost circuit comprises a fourth power switch tube, a sixth diode, a second inductor and a fourth capacitor; the input end of the fourth power switch tube is connected with the anode of the sixth diode, the cathode of the sixth diode is connected with one end of the fourth capacitor, the output end of the fourth power switch tube is connected with the second inductor and the other end of the fourth capacitor, and the control end of the fourth power switch tube is used for receiving a driving signal; or,
each boost circuit comprises a fifth power switch tube, a seventh diode, a third inductor and a fifth capacitor; the input end of the fifth power switch tube is connected with the third inductor and one end of the fifth capacitor, the output end of the fifth power switch tube is connected with the cathode of the seventh diode, the other end of the fifth capacitor is connected with the anode of the seventh diode, and the control end of the fifth power switch tube is used for receiving a driving signal.
2. The microwave oven power circuit of claim 1, further comprising a bus voltage adjustment circuit between the rectifying and filtering circuit and the isolation circuit;
and the bus voltage adjusting circuit is used for adjusting the direct-current voltage output by the rectifying and filtering circuit.
3. The microwave oven power circuit of claim 2, wherein the bus voltage adjustment circuit comprises a first inductor, a first power switch tube, a first diode, and a first capacitor;
one end of the first inductor is connected with the positive electrode output end of the rectifying and filtering circuit, the other end of the first inductor is connected with the input end of the first power switch tube and the anode of the first diode, the output end of the first power switch tube and one end of the first capacitor are connected with the negative electrode output end of the rectifying and filtering circuit, the cathode of the first diode is connected with the other end of the first capacitor, and the control end of the first power switch tube is used for receiving a driving signal.
4. A microwave oven, characterized in that the microwave oven comprises a microwave oven power circuit as claimed in any one of claims 1-3.
5. The microwave oven of claim 4, wherein the metal cavity of the microwave oven is electrically non-conductive with the housing, and wherein the metal cavity of the microwave oven is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910027715.9A CN109510460B (en) | 2019-01-11 | 2019-01-11 | Microwave oven power supply circuit and microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910027715.9A CN109510460B (en) | 2019-01-11 | 2019-01-11 | Microwave oven power supply circuit and microwave oven |
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| CN109510460A CN109510460A (en) | 2019-03-22 |
| CN109510460B true CN109510460B (en) | 2024-02-09 |
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| Publication number | Publication date |
|---|---|
| CN109510460A (en) | 2019-03-22 |
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