CN203801099U - Power circuit and microwave oven - Google Patents
Power circuit and microwave oven Download PDFInfo
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- CN203801099U CN203801099U CN201420167924.6U CN201420167924U CN203801099U CN 203801099 U CN203801099 U CN 203801099U CN 201420167924 U CN201420167924 U CN 201420167924U CN 203801099 U CN203801099 U CN 203801099U
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Abstract
The utility model provides a power circuit and a microwave oven. The power circuit comprises: a frequency conversion circuit, which is connected to a voltage inverter circuit and is used for converting an external direct current into an alternating current and changing the frequency of the alternating current; the voltage inverter circuit, which is connected to a voltage doubling circuit and is used for receiving the alternating current from the frequency conversion circuit and outputting the alternating current to the voltage doubling circuit; and the voltage doubling circuit, which is connected to a magnetron in a heater and is used for boosting the voltage of the alternating current to drive the magnetron. According to the power circuit, the voltage doubling circuit is used for completing boosting processing of a load voltage; and the circuit has the simple structure.
Description
Technical field
The utility model relates to microwave heating technique field, in particular to a kind of power circuit and a kind of microwave oven with this power circuit.
Background technology
On the high-frequency heating apparatus power supply of frequency-conversion microwave oven, in order to drive magnetron output microwave, need to be by more than 20 times of 220 volts of boost in voltage of civil power, be magnetron power supply.
Traditional boosting mode is recently to change output voltage by changing the primary coil of transformer and the bundle number of secondary coil, if need more high voltage, prick number larger, this boosting mode has limitation, therefore need a kind of new power circuit, adopt new boosting mode to improve line voltage to drive magnetron.
Utility model content
The utility model is intended at least solve one of technical problem existing in prior art or correlation technique.
For this reason, an object of the present utility model is to have proposed a kind of power circuit, and the bundle number that can not change transformer drives the required voltage of magnetron than line voltage is risen to.
Another object of the present utility model is to have proposed a kind of microwave oven.
For achieving the above object, according to the embodiment of first aspect of the present utility model, provide a kind of power circuit, for heater, comprise: frequency changer circuit, is connected to voltage inverter circuit, by the converting direct-current power into alternating-current power from outside and change the frequency of described alternating current; Described voltage inverter circuit, is connected to voltage-multiplying circuit, receives the alternating current from described frequency changer circuit, and described alternating current is transferred to described voltage-multiplying circuit; Described voltage-multiplying circuit, is connected to the magnetron in described heater, promotes the voltage of described alternating current, to drive described magnetron.
This outside direct current can be the direct current that civil power is exported after over commutation, and therefore rectifier filter can not be integrated in this power circuit.In the present embodiment, after voltage inverter circuit, connect a voltage-multiplying circuit, voltage inverter circuit is except for electric energy transmitting, also for promoting the voltage of alternating current, but the voltage of this alternating current can not meet for driving magnetron, utilize the voltage-multiplying circuit increasing to continue to promote the voltage of alternating current, thereby drive magnetron output microwave, the structure of this power circuit is different from the mode of only carrying out voltage lifting by voltage inverter circuit at present, and circuit structure is simple, only increase a voltage-multiplying circuit.
In technique scheme, preferred, described voltage-multiplying circuit is half-wave voltage-multiplying circuit.It will be understood by those skilled in the art that voltage-multiplying circuit can be also full-wave voltage multiplier circuit.
In technique scheme, preferably, described voltage inverter circuit is transformer, and described voltage-multiplying circuit comprises: electric capacity and the first diode, described electric capacity is connected with described the first diode, and the two ends of the first secondary coil of described transformer are connected to respectively described electric capacity and described the first diode.
In technique scheme, preferred, one end of described electric capacity is connected to one end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to the positive pole of the first diode; The negative pole of described the first diode is connected to the other end and described magnetron the ground connection of described the first secondary coil, the positive pole of described the first diode is connected to one end of the second subprime coil of described transformer, wherein, the two ends of the second subprime coil of described transformer are all connected to described magnetron.
In technique scheme, preferred, one end of described electric capacity is connected to one end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to negative pole the ground connection of the first diode; The negative pole of described the first diode is also connected to described magnetron, the positive pole of described the first diode is connected to one end of the other end of described the first secondary coil and the second subprime coil of described transformer, wherein, the two ends of the second subprime coil of described transformer are all connected to described magnetron.
In technique scheme, preferred, described voltage-multiplying circuit can also comprise: the second diode, described the second diode is connected with described the first diode.
In technique scheme, preferred, one end of described electric capacity is connected to the first end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to negative pole the ground connection of described the first diode; The positive pole of described the first diode is connected to the negative pole of described the second diode, and the positive pole of described the second diode is also connected to described magnetron; The negative pole of described the second diode is connected to the other end of described the first secondary coil, and the positive pole of described the second diode is connected to one end of the second subprime coil of described transformer, and wherein, the two ends of described second subprime coil are all connected to described magnetron.
In the present embodiment, voltage-multiplying circuit comprises a high-voltage capacitance and two high-voltage diodes, when the cathode voltage of the first diode is during higher than cathode voltage, and the first diode current flow, transformer is by the first diode to capacitor charging, and now magnetron is not worked; Otherwise, transformer and capacitances in series, form voltage-multiplying circuit, the first diode disconnects, the second diode current flow, this voltage forms loop through magnetron and the second diode, utilizes the voltage stabilizing of magnetron own and one-way conduction characteristic, secondary voltage can be stabilized in 4000 volts, drives magnetron normally to work.
In technique scheme, preferred, one end of described electric capacity is connected to the first end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to the positive pole of described the first diode; The positive pole of described the second diode is connected to the negative pole of the first diode, and the negative pole of described the second diode is connected to described magnetron and ground connection; The negative pole of described the first diode is connected to the other end of described the first secondary coil, and the positive pole of described the first diode is also connected to one end of the second subprime coil of described transformer, and wherein, the two ends of described second subprime coil are all connected to described magnetron.In the present embodiment, voltage-multiplying circuit comprises an electric capacity and a diode, can realize equally a times compression functions, and the components and parts that such voltage-multiplying circuit adopts are few, and the volume taking also diminishes, and cost is corresponding minimizing also.
In technique scheme, preferred, can also comprise: rectification circuit, be connected to described frequency changer circuit, will convert direct current to from outside alternating current, and export described direct current to described frequency changer circuit.
In technique scheme, preferred, described frequency changer circuit comprises: switching circuit, be connected to drive circuit, and receive described direct current, and according to the driving signal conduction of described drive circuit or disconnect the primary return of described power circuit; Described drive circuit, is connected to controller, receives the control signal from described controller, and converts described control signal to described driving signal; Described controller, sends described control signal to described drive circuit.Wherein, described switching circuit is device for power switching.
According to the embodiment of second aspect of the present utility model, a kind of microwave oven is also provided, comprise the power circuit described in above-mentioned arbitrary technical scheme.
Simple in structure due to according to power circuit of the present utility model, volume is little, therefore adopts the volume of the microwave oven of above-mentioned power circuit also relatively to diminish.
Brief description of the drawings
Fig. 1 shows according to the structural representation of the power circuit of an embodiment of the present utility model;
Fig. 2 shows according to the structural representation of the power circuit of another embodiment of the present utility model;
Fig. 3 A shows the schematic diagram of wherein a kind of working method of the power circuit shown in Fig. 2;
Fig. 3 B shows the schematic diagram of the another kind of working method of the power circuit shown in Fig. 2;
Fig. 4 shows according to the structural representation of the power circuit of another embodiment of the present utility model;
Fig. 5 A shows the schematic diagram of wherein a kind of working method of the power circuit shown in Fig. 4;
Fig. 5 B shows the schematic diagram of the another kind of working method of the power circuit shown in Fig. 4;
Fig. 6 shows according to the structural representation of the power circuit of another embodiment of the present utility model;
Fig. 7 A shows the schematic diagram of wherein a kind of working method of the power circuit shown in Fig. 6;
Fig. 7 B shows the schematic diagram of the another kind of working method of the power circuit shown in Fig. 6;
Fig. 8 shows according to the structural representation of the power circuit of an embodiment more of the present utility model;
Fig. 9 A shows the schematic diagram of wherein a kind of working method of the power circuit shown in Fig. 8;
Fig. 9 B shows the schematic diagram of the another kind of working method of the power circuit shown in Fig. 8.
Embodiment
In order more clearly to understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the utility model, but, the utility model can also adopt other to be different from other modes described here and implement, and therefore, the utility model is not limited to the restriction of following public specific embodiment.
Fig. 1 shows according to the structural representation of the power circuit of an embodiment of the present utility model.
As shown in Figure 1, according to the embodiment of first aspect of the present utility model, provide a kind of power circuit, for heater, comprise: frequency changer circuit 104, is connected to voltage inverter circuit 106, by the converting direct-current power into alternating-current power from outside and change the frequency of described alternating current; Described voltage inverter circuit 106, is connected to voltage-multiplying circuit 108, receives the alternating current from described frequency changer circuit, and described alternating current is transferred to described voltage-multiplying circuit 108; Described voltage-multiplying circuit 108, is connected to the magnetron 110 in described heater, promotes the voltage of described alternating current, to drive described magnetron 110.
This outside direct current can be the direct current that civil power is exported after over commutation, and therefore rectifier filter can not be integrated in this power circuit.In the present embodiment, after voltage inverter circuit, connect a voltage-multiplying circuit, voltage inverter circuit is except for electric energy transmitting, also for promoting the voltage of alternating current, but the voltage of this alternating current can not meet for driving magnetron, utilize the voltage-multiplying circuit increasing to continue to promote the voltage of alternating current, thereby drive magnetron output microwave, the structure of this power circuit is different from the mode of only carrying out voltage lifting by voltage inverter circuit at present, and circuit structure is simple, only increase a voltage-multiplying circuit.
In technique scheme, preferred, described voltage-multiplying circuit 108 is half-wave voltage-multiplying circuit.It will be understood by those skilled in the art that voltage-multiplying circuit can be also full-wave voltage multiplier circuit.
In technique scheme, preferably, described voltage inverter circuit 106 is transformer, as shown in Figure 2, described voltage-multiplying circuit 108 comprises: electric capacity, the first diode and the second diode, described electric capacity is connected with described the first diode, and the first diode is connected with the second diode, and the two ends of the first secondary coil of described transformer are connected to respectively described electric capacity and described the first diode.
In technique scheme, preferably, as shown in Figure 3 A and Figure 3 B, described voltage-multiplying circuit 108 comprises: electric capacity (being capacitor C 1), one end of described electric capacity is connected to the first end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to negative pole the ground connection of the first diode (being diode D1); Described the first diode, the positive pole of described the first diode is connected to the negative pole of the second diode (being diode D2), and the positive pole of described the second diode is also connected to described magnetron; Described the second diode, the negative pole of described the second diode is connected to the other end of described the first secondary coil, the positive pole of described the second diode is connected to one end of the second subprime coil of described transformer, and wherein, the two ends of described second subprime coil are all connected to described magnetron 110.
In the present embodiment, a times voltage follower circuit comprises two high-voltage diodes and a high-voltage capacitance, and the secondary one end of high-tension transformer is connected with high-voltage capacitance; The transformer secondary output other end is connected with two high-voltage diodes; The first diode is connected with high-voltage capacitance and receives on ground wire; The second diode cathode is received on magnetron in Filament Winding.
In the time that variable frequency power supply is worked, device for power switching 1042 carries out conducting and closes according to power control information; The primary coil of capacitor C 17 and transformer T1 forms resonant tank circle, and electric current does not present in the same time positive and negative different directions in resonant tank, and then the primary side of T1 will produce positive and negative different voltage.In the time that 4 ends of T1 are forward voltage, the voltage of diode D1 positive pole is higher than the voltage of negative pole, diode D1 conducting, and transformer T1 charges to capacitor C 1 by diode D1, and referring to Fig. 3 A, now magnetron is not worked; In the time that 3 ends of T1 are forward voltage, transformer T1 voltage and capacitor C 1 are connected, form voltage-multiplying circuit, diode D1 disconnects, diode D2 conducting, and this voltage forms loop through magnetron and diode D2, referring to Fig. 3 B, utilize the voltage stabilizing of magnetron own and one-way conduction characteristic, secondary voltage can be stabilized in 4000 volts, drives magnetron normally to work.
In technique scheme, preferably, as shown in Fig. 4, Fig. 5 A and Fig. 5 B, described voltage inverter circuit 106 is transformer, described voltage-multiplying circuit 108 comprises: electric capacity (being capacitor C 1), one end of described electric capacity is connected to the first end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to the positive pole of the first diode; Described the second diode (being diode D1), the positive pole of described the second diode is connected to the negative pole of the first diode, and the negative pole of described the second diode is also connected to described magnetron 110 and ground connection; Described the first diode (being diode D2), the negative pole of described the first diode is connected to the other end of described the first secondary coil, the positive pole of described the first diode is also connected to one end of the second subprime coil of described transformer, wherein, the two ends of described second subprime coil are all connected to described magnetron 110.When work, in the time that 4 ends of T1 are negative voltage, the voltage of D2 positive pole is higher than the voltage of negative pole, D2 conducting, and transformer T1 charges to C2 by D2, and referring to Fig. 5 A, now magnetron is not worked; In the time that 4 ends of T1 are forward voltage, D1 conducting, transformer T1 voltage and C2 series connection, form voltage-multiplying circuit, this voltage exports magnetron to through D1, referring to Fig. 5 B, utilize the voltage stabilizing of magnetron own and one-way conduction characteristic, secondary voltage can be stabilized in 4000 volts, drives magnetron normally to work.
In technique scheme, preferred, described voltage-multiplying circuit 108 comprises: electric capacity and the first diode, and described electric capacity is connected with described the first diode, and the two ends of the first secondary coil of described transformer are connected to respectively described electric capacity and described the first diode
Wherein, preferred, as shown in Fig. 6, Fig. 7 A and Fig. 7 B, described voltage-multiplying circuit 108 comprises: electric capacity (being C1), and one end of described electric capacity is connected to one end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to the positive pole of the first diode; Described the first diode (being diode D1), the negative pole of described the first diode is connected to the other end and described magnetron 110 ground connection of described the first secondary coil, the positive pole of described the first diode is connected to one end of the second subprime coil of described transformer, wherein, the two ends of the second subprime coil of described transformer are all connected to described magnetron 110.In the present embodiment, voltage-multiplying circuit comprises an electric capacity and a diode, can realize equally a times compression functions, and the components and parts that such voltage-multiplying circuit adopts are few, and the volume taking also diminishes, and cost is corresponding minimizing also.
When work, in the time that 3 ends of T1 are forward voltage, the voltage of D2 positive pole is higher than the voltage of negative pole, D2 conducting, and transformer T1 charges to C2 by D2, and referring to Fig. 7 A, now magnetron 110 is not worked; In the time that 4 ends of T1 are forward voltage, transformer T1 voltage and C2 series connection, form voltage-multiplying circuit, this Voltage-output, to magnetron 110, referring to Fig. 7 B, utilizes the voltage stabilizing of magnetron own and one-way conduction characteristic, secondary voltage can be stabilized in 4000 volts, drives magnetron 110 normally to work.
In technique scheme, preferably, as shown in Fig. 8, Fig. 9 A and Fig. 9 B, described voltage-multiplying circuit 108 comprises: electric capacity (being capacitor C 1), one end of described electric capacity is connected to one end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to negative pole the ground connection of the first diode; Described the first diode (being diode D2), the negative pole of described the first diode is also connected to described magnetron 110, the positive pole of described the first diode is connected to one end of the other end of described the first secondary coil and the second subprime coil of described transformer, wherein, the two ends of the second subprime coil of described transformer are all connected to described magnetron 110.
When work, in the time that 4 ends of T1 are forward voltage, the voltage of D1 positive pole is higher than the voltage of negative pole, D1 conducting, and transformer T1 charges to C1 by D1, and referring to Fig. 9 A, now magnetron 110 is not worked; In the time that 3 ends of T1 are forward voltage, transformer T1 voltage and C1 series connection, form voltage-multiplying circuit, this Voltage-output, to magnetron 110, referring to Fig. 9 B, utilizes the voltage stabilizing of magnetron 110 own and one-way conduction characteristic, secondary voltage can be stabilized in 4000 volts, drives magnetron 110 normally to work.
In technique scheme, preferred, continue to get back to Fig. 1 and Fig. 2, power circuit can also comprise: rectification circuit 102, be connected to described frequency changer circuit 104, will convert direct current to from outside alternating current, and export described direct current to described frequency changer circuit 104.
In technique scheme, preferred, get back to Fig. 2, as shown in Figure 2, described frequency changer circuit 104 comprises: switching circuit 1042, is connected to drive circuit 1044, receive described direct current, and according to the driving signal conduction of described drive circuit or disconnect the primary return of described power circuit; Described drive circuit 1044, is connected to controller 1046, receives the control signal from described controller, and converts described control signal to described driving signal; Described controller 1046, sends described control signal to described drive circuit 1044.Wherein, described switching circuit 1042 is device for power switching.
Provide a kind of new boost in voltage mode according to power circuit of the present utility model, increase voltage-multiplying circuit, wherein, preferred, this voltage-multiplying circuit is half-wave voltage-multiplying circuit, circuit structure is simple, and high tension apparatus (high-voltage capacitance and high-voltage diode) quantity is relative less, is meeting equally in the prerequisite of electric clearance and creepage distance, circuit board size can be less, thereby make whole power module less, more general, cost is also lower.
According to the embodiment of second aspect of the present utility model, a kind of microwave oven is also provided, comprise the power circuit described in above-mentioned arbitrary technical scheme.
Simple in structure due to according to power circuit of the present utility model, volume is little, therefore adopts the volume of the microwave oven of above-mentioned power circuit also relatively to diminish.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (11)
1. a power circuit, is characterized in that, for heater, comprising:
Frequency changer circuit, is connected to voltage inverter circuit, by the converting direct-current power into alternating-current power from outside and change the frequency of described alternating current;
Described voltage inverter circuit, is connected to voltage-multiplying circuit, receives the alternating current from described frequency changer circuit, and described alternating current is transferred to described voltage-multiplying circuit;
Described voltage-multiplying circuit, is connected to the magnetron in described heater, promotes the voltage of described alternating current, to drive described magnetron.
2. power circuit according to claim 1, is characterized in that, described voltage-multiplying circuit is half-wave voltage-multiplying circuit.
3. power circuit according to claim 1, it is characterized in that, described voltage inverter circuit is transformer, described voltage-multiplying circuit comprises: electric capacity and the first diode, described electric capacity is connected with described the first diode, and the two ends of the first secondary coil of described transformer are connected to respectively described electric capacity and described the first diode.
4. power circuit according to claim 3, is characterized in that, one end of described electric capacity is connected to one end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to the positive pole of the first diode;
The negative pole of described the first diode is connected to the other end and described magnetron the ground connection of described the first secondary coil, the positive pole of described the first diode is connected to one end of the second subprime coil of described transformer, wherein, the two ends of the second subprime coil of described transformer are all connected to described magnetron.
5. power circuit according to claim 3, is characterized in that, one end of described electric capacity is connected to one end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to negative pole the ground connection of the first diode;
The negative pole of described the first diode is also connected to described magnetron, the positive pole of described the first diode is connected to one end of the other end of described the first secondary coil and the second subprime coil of described transformer, wherein, the two ends of the second subprime coil of described transformer are all connected to described magnetron.
6. power circuit according to claim 3, is characterized in that, described voltage-multiplying circuit also comprises:
The second diode, described the second diode is connected with described the first diode.
7. power circuit according to claim 6, is characterized in that, one end of described electric capacity is connected to the first end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to negative pole the ground connection of described the first diode;
The positive pole of described the first diode is connected to the negative pole of described the second diode, and the positive pole of described the second diode is also connected to described magnetron;
The negative pole of described the second diode is connected to the other end of described the first secondary coil, and the positive pole of described the second diode is connected to one end of the second subprime coil of described transformer, and wherein, the two ends of described second subprime coil are all connected to described magnetron.
8. power circuit according to claim 6, is characterized in that, one end of described electric capacity is connected to the first end of the first secondary coil of described transformer, and the other end of described electric capacity is connected to the positive pole of described the first diode;
The positive pole of described the second diode is connected to the negative pole of the first diode, and the negative pole of described the second diode is connected to described magnetron and ground connection;
The negative pole of described the first diode is connected to the other end of described the first secondary coil, and the positive pole of described the first diode is also connected to one end of the second subprime coil of described transformer, and wherein, the two ends of described second subprime coil are all connected to described magnetron.
9. according to the power circuit described in any one in claim 1 to 8, it is characterized in that, also comprise:
Rectification circuit, is connected to described frequency changer circuit, will convert direct current to from outside alternating current, and exports described direct current to described frequency changer circuit.
10. power circuit according to claim 9, is characterized in that, described frequency changer circuit comprises:
Switching circuit, is connected to drive circuit, receives described direct current, and according to the driving signal conduction of described drive circuit or disconnect the primary return of described power circuit;
Described drive circuit, is connected to controller, receives the control signal from described controller, and converts described control signal to described driving signal;
Described controller, sends described control signal to described drive circuit.
11. 1 kinds of microwave ovens, is characterized in that, comprise the power circuit as described in any one in claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420167924.6U CN203801099U (en) | 2014-04-08 | 2014-04-08 | Power circuit and microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420167924.6U CN203801099U (en) | 2014-04-08 | 2014-04-08 | Power circuit and microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203801099U true CN203801099U (en) | 2014-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420167924.6U Expired - Lifetime CN203801099U (en) | 2014-04-08 | 2014-04-08 | Power circuit and microwave oven |
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| CN (1) | CN203801099U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104936327A (en) * | 2015-07-08 | 2015-09-23 | 王春芳 | Magnetron power supply power transmission and control method used for microwave oven |
| CN114401564A (en) * | 2022-01-12 | 2022-04-26 | 广东美的厨房电器制造有限公司 | Microwave oven and vehicle |
-
2014
- 2014-04-08 CN CN201420167924.6U patent/CN203801099U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104936327A (en) * | 2015-07-08 | 2015-09-23 | 王春芳 | Magnetron power supply power transmission and control method used for microwave oven |
| CN114401564A (en) * | 2022-01-12 | 2022-04-26 | 广东美的厨房电器制造有限公司 | Microwave oven and vehicle |
| CN114401564B (en) * | 2022-01-12 | 2024-05-24 | 广东美的厨房电器制造有限公司 | Microwave oven and vehicle |
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Granted publication date: 20140827 |
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