CN203104844U - Frequency conversion microwave oven power supply - Google Patents
Frequency conversion microwave oven power supply Download PDFInfo
- Publication number
- CN203104844U CN203104844U CN 201320067245 CN201320067245U CN203104844U CN 203104844 U CN203104844 U CN 203104844U CN 201320067245 CN201320067245 CN 201320067245 CN 201320067245 U CN201320067245 U CN 201320067245U CN 203104844 U CN203104844 U CN 203104844U
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Abstract
The utility model discloses a frequency conversion microwave oven power supply which comprises an alternating current input circuit, a frequency conversion power supply, a computer control circuit, an auxiliary power supply and a first oven door switch, wherein the frequency conversion power supply comprises a rectifying and filtering circuit, a power transformation circuit and a control unit; the power supply input end of the control unit is connected with the output end of the auxiliary power supply, and the first oven door switch is serially connected between the power supply input end of the control unit and the power supply end of the control circuit. When an oven door is pulled open, the first oven door switch is switched off, a frequency conversion power supply board control unit is interrupted, and the frequency conversion power supply stops working, thus the frequency conversion microwave oven power supply is safe and reliable; the control unit is low in control current voltage and current, the oven door switch does not adopt a heavy-power travel switch, and the wiring of the oven door switch is simplified; and an alternating current relay can be saved, and thus a control line is simplified and the production cost is lowered.
Description
[technical field]
The utility model relates to the variable frequency microwave stove, relates in particular to a kind of variable frequency microwave stove power supply.
[background technology]
The operation principle of traditional frequency conversion microwave oven supply power as shown in Figure 1.Alternating current is after EMI filtering, and an end is through temperature detect switch (TDS) S0, and stove door switch S1 connects an input of variable frequency power supply, and the other end is connected to another input of variable frequency power supply through relay R L1.Temperature detect switch (TDS) S1 is installed in the top of magnetron M, and automatic disconnection when the temperature of magnetron M or furnace chamber is too high the excess temperature accident can not take place to guarantee microwave oven.
Stove door switch S1 disconnects when oven door opening, connects when fire door closes, and variable frequency power supply does not have the input of AC voltage when oven door opening, has reduced little danger of microwave leakage.Stove door switch S2 and stove door switch S1 link, and are connected in two AC inputs of variable frequency power supply, closure when oven door opening.Open fire door under the situation of stove door switch S1 because of the inefficacy short circuit, the AC input of variable frequency power supply is fallen in stove door switch S2 meeting short circuit, causes the size fusible circuit, breaker on the EMI filter circuit, to avoid the risk of microwave leakage.Stove door switch S3 and stove door switch S1 interlock, stove door switch S3 is connected to computer-controlled circuit, is used for computer-controlled circuit and reads door state information.
When microwave oven is worked with microwave mode, relay R L1 adhesive, the AC input of variable frequency power supply is connected, and through rectifying and wave-filtering, obtains required filament voltage of magnetron work and anode high voltage after Power Conversion and the high-voltage rectifying filtering.The control unit of variable frequency power supply has comprised functional modules such as the generation of PMW signal, IGBT driving, power control, abnormal protection and communication.Variable frequency power supply inside also comprises an auxiliary power supply module, offers the required voltage of each functional module of control unit.
The traditional frequency conversion microwave oven also comprises computer-controlled circuit, computer-controlled circuit receives the operational order that panel sends, and work state information etc. is presented on the panel, the relay of commands for controlling variable frequency power supply, stove lamp and the cooling system that sends according to panel turns on and off simultaneously.
The stove door switch of traditional frequency conversion microwave oven supply power will cut off the Alternating Current Power Supply major loop, needs the travel switch of big electric current, the cost height; Numerous alternating current wires need be connected on the stove door switch, the line complexity of stove door switch.
[summary of the invention]
The technical problems to be solved in the utility model provide a kind of simple in structure, cost is low, the simple variable frequency microwave stove of the line of stove door switch power supply.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of variable frequency microwave stove power supply, comprise ac input circuit, variable frequency power supply, computer-controlled circuit, accessory power supply and first stove door switch, variable frequency power supply comprises current rectifying and wave filtering circuit, power conversion circuit and control unit; The power input of control unit connects the output of accessory power supply, and first stove door switch is serially connected between the feeder ear of the power input of control unit and control unit.
Above-described variable frequency microwave stove power supply, comprise electronic switch and voltage stabilizing circuit, the signal input end of electronic switch connects the power information pulse signal output end of computer-controlled circuit microprocessor, the input termination accessory power supply of electronic switch, the output of electronic switch connects the power input of control unit through first stove door switch.Described voltage stabilizing circuit is connected on the output of electronic switch or the power input of control unit.
Above-described variable frequency microwave stove power supply, electronic switch comprises first optocoupler, PNP triode, NPN triode, capacitance, smoothing capacity, first resistance and diode, the power information pulse signal output end of the input termination computer-controlled circuit microprocessor of first optocoupler, the collector electrode of the first optocoupler phototriode connects the positive pole of auxiliary power output end by first resistance; The emitter of PNP triode connects the positive pole of auxiliary power output end, and collector electrode connects the power input of control unit by first stove door switch, and base stage connects the collector electrode of NPN triode; The grounded emitter of NPN triode, base stage connect the collector electrode of the first optocoupler phototriode by capacitance; The emitter of one termination NPN triode of smoothing capacity, the collector electrode of another termination NPN triode; The anode of diode connects the emitter of NPN triode, and negative electrode connects the base stage of NPN triode.
Above-described variable frequency microwave stove power supply, voltage stabilizing circuit comprises three terminal regulator, the 4th resistance, first electrochemical capacitor and second electrochemical capacitor, the voltage input end of three terminal regulator connects first end of the 4th resistance, and second end of the 4th resistance connects the collector electrode of PNP triode by first stove door switch.The positive pole of control unit high-voltage power supply input connects the voltage input end of three terminal regulator, the voltage output end of LVPS input termination three terminal regulator, earth terminal ground connection; The earth terminal ground connection of three terminal regulator, the positive pole of first electrochemical capacitor connects the voltage input end of three terminal regulator U3, other end ground connection; The positive pole of second electrochemical capacitor connects the voltage output end of three terminal regulator U3, other end ground connection
Above-described variable frequency microwave stove power supply comprises the power information transmitting line, the collector electrode of a termination first optocoupler phototriode of power information transmitting line, another termination control unit power information receiving terminal.
Above-described variable frequency microwave stove power supply, comprise frequency conversion plate feedback information circuit, frequency conversion plate feedback information circuit comprises second optocoupler, the input termination control unit frequency conversion plate information transmitting terminal of second optocoupler, the frequency conversion plate information receiving end of output termination computer-controlled circuit microprocessor.
Above-described variable frequency microwave stove power supply comprises and second stove door switch that comprises the interlock of first stove door switch, the positive pole of the power input of a termination control unit of second stove door switch, other end ground connection.
Above-described variable frequency microwave stove power supply comprises and the 3rd stove door switch that comprises the interlock of first stove door switch that the 3rd stove door switch connects computer-controlled circuit.
Above-described variable frequency microwave stove power supply, the feeder ear of described control unit is the output of accessory power supply, the power input of accessory power supply connects the output of described current rectifying and wave filtering circuit or the output of described ac input circuit.
Above-described variable frequency microwave stove power supply, the power output end of accessory power supply also connects computer-controlled circuit.
When the utility model variable frequency microwave stove power supply drew back fire door, first stove door switch disconnected, variable frequency power supply plate control unit dead electricity, and variable frequency power supply quits work, and is safe and reliable; The Control current voltage of control unit is low, electric current is little, and stove door switch does not need to use powerful travel switch, and the wiring of stove door switch is also simplified; Can also save an AC relay, simplify control circuit, reduce production cost.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the schematic diagram of prior art variable frequency microwave stove power supply.
Fig. 2 is the schematic diagram of the utility model embodiment 1 variable frequency microwave stove power supply.
Fig. 3 is the schematic diagram of the utility model embodiment 2 variable frequency microwave stove power supplys.
Fig. 4 is the schematic diagram of the utility model embodiment 3 variable frequency microwave stove power supplys.
Fig. 5 is the schematic diagram of the utility model embodiment 4 variable frequency microwave stove power supplys.
[embodiment]
The utility model embodiment 1 variable frequency microwave stove power supply comprises single phase alternating current (A.C.) input circuit, variable frequency power supply plate, computer control board and stove door switch as shown in Figure 2.
Stove door switch comprises the first stove door switch S1, the first stove door switch S2 and the first stove door switch S3 of interlock.
The AC voltage of single phase alternating current (A.C.) input circuit termination of output behind filter band is gone into an end of variable frequency power supply plate input, and the other end is connected in the other end of variable frequency power supply plate input behind temperature detect switch (TDS) S1.
The variable frequency power supply plate comprises current rectifying and wave filtering circuit, power conversion circuit and control unit; Control unit comprises functional modules such as the generation of PMW signal, IGBT driving, power control, abnormal protection and communication.
The first stove door switch S1 is serially connected between the auxiliary power supply end Vcc of the power input of control unit and variable frequency power supply plate.
One of variable frequency power supply plate energy operate as normal necessary condition is for IGBT has correct drive signal, if there is not accessory power supply to power to control unit, control unit can't be worked, and does not just have PWM or PFM ripple and produces, and IGBT does not have drive signal yet.
When drawing back fire door, stove door switch S1 disconnects, variable frequency power supply plate control unit dead electricity, thereby the variable frequency power supply plate quits work.
The power input of the termination control unit of the second stove door switch S2, the earth terminal of another termination control unit, be between Vcc and the ground, guarantee that the stove door switch S1 back power Vcc that lost efficacy can not have auxiliary power supply to give the control unit of variable frequency power supply plate because of stove door switch S2 short circuit yet, thereby can not cause microwave leakage when having guaranteed oven door opening.
Microwave oven sends work order by computer control board (computer-controlled circuit) when operate as normal, comprised work in the work order, stop, information such as power grade, after the variable frequency power supply plate is received instruction, by the state work of computer plate requirement.The 3rd stove door switch connects the computer control board, the 3rd stove door switch S3 disconnects when oven door opening, this status signal is detected by the computer control board, send variable frequency power supply plate silence signal immediately, the variable frequency power supply plate receives that this signal also can quit work immediately, and the Shi Buhui that guaranteed from another point of view to open the door causes microwave leakage.
The Vcc of variable frequency power supply plate power supply can be the accessory power supply of variable frequency power supply plate itself, also can be that the accessory power supply that adds comprises by the computer control board and provides auxiliary Vcc to power.
The variable frequency microwave stove power supply of the utility model embodiment 2 as shown in Figure 3, the feeder ear of control unit is the output of the accessory power supply of variable frequency power supply plate own, the power input of accessory power supply connects the output of current rectifying and wave filtering circuit.Accessory power supply has many group outputs, and one group of output offers the control unit work of variable frequency power supply plate, and another part offers the work of computer control board.
The variable frequency microwave stove power supply of the utility model embodiment 3 as shown in Figure 4, the feeder ear of control unit is the output of last accessory power supply, the AC input of accessory power supply and the AC of variable frequency power supply plate input is in parallel.Accessory power supply has many group outputs, and one group of output offers the control unit work of variable frequency power supply plate, and another part offers the work of computer control board.
The principle of the utility model embodiment 4 variable frequency microwave stove power supplys as shown in Figure 5.The variable frequency power supply plate comprises current rectifying and wave filtering circuit, accessory power supply, power conversion circuit, control unit, electronic switch and voltage stabilizing circuit.Control unit comprises functional modules such as the generation of PMW signal, IGBT driving, power control, abnormal protection and communication.The output of the input termination current rectifying and wave filtering circuit of accessory power supply.
The signal input end of electronic switch connects the power information pulse signal output end of computer-controlled circuit microprocessor, and the input termination accessory power supply of electronic switch, the output of electronic switch connect the power input of control unit through the first stove door switch S1.Voltage stabilizing circuit is connected on the output of electronic switch or the power input of control unit.
In the embodiment shown in fig. 5, electronic switch comprises the first optocoupler U1, PNP triode Q1, NPN triode Q2, capacitance C1, smoothing capacity C2, first resistance R 1, second resistance R 2, the 3rd resistance R 3 and diode D1.The power information pulse signal output end of the input termination computer-controlled circuit microprocessor (single-chip microcomputer) of the first optocoupler U1, the collector electrode of the first optocoupler U1 phototriode connect the positive pole of auxiliary power output end by first resistance R 1.The emitter of PNP triode Q1 connects the positive pole of auxiliary power output end, and collector electrode connects the power input of control unit by first stove door switch, and base stage connects the collector electrode of NPN triode Q2 by the 3rd resistance R 3.The grounded emitter of NPN triode Q2, base stage connect the collector electrode of the first optocoupler U1 phototriode by the capacitance C1 and second resistance R 2.The emitter of the termination NPN triode Q2 of smoothing capacity C2, the collector electrode of another termination NPN triode Q2.The anode of diode D1 connects the emitter of NPN triode Q2, and negative electrode connects the base stage of NPN triode Q2.
Voltage stabilizing circuit comprises three terminal regulator U3, the 4th resistance R 4, the first electrochemical capacitor EC1 and the second electrochemical capacitor EC2.The voltage input end of three terminal regulator U3 connects first end of the 4th resistance R 4, and second end of the 4th resistance R 4 connects the collector electrode of PNP triode Q1 by first stove door switch.The positive pole of control unit 15V power input connects the voltage input end of three terminal regulator U3, and the 5V power input connects the voltage output end of three terminal regulator U3, earth terminal ground connection.Three terminal regulator U3 earth terminal ground connection.The positive pole of the first electrochemical capacitor EC1 connects the voltage input end of three terminal regulator U3, other end ground connection, and the positive pole of the second electrochemical capacitor EC2 connects the voltage output end of three terminal regulator U3, other end ground connection.
The second stove door switch S2 and first stove door switch S1 interlock, the second stove door switch S2 is connected between second end and ground of the 4th resistance R 4.
The collector electrode of one termination, the first optocoupler U1 phototriode of power information transmitting line, another termination control unit power information receiving terminal.
Frequency conversion plate feedback information circuit comprises the second optocoupler U2, the input termination control unit frequency conversion plate information transmitting terminal of the second optocoupler U2, the frequency conversion plate information receiving end of output termination computer-controlled circuit microprocessor.
AC voltage offers accessory power supply work behind variable frequency power supply plate rectifying and wave-filtering.Accessory power supply has many group outputs; one group of 15V output voltage through the electronic switch that constitutes by triode Q1, triode Q2 again through supplying with the PWM drive part work of variable frequency power supply plate control unit behind the stove door switch S2; 15V voltage is supplied with the single-chip microcomputer work of control unit after voltage stabilizing chip U3 is depressurized to 5V; to realize that PWM produces power control, protection and communication function.
The electronic switch that is made of triode Q1, triode Q2 is controlled by the signal of communication that computer control board single-chip microcomputer comes, signal of communication from computer control board single-chip microcomputer is a pulse signal, be transferred to the variable frequency power supply plate through optocoupler U1, resistance R 1, on resistance R 1, obtain a pulse signal, pulse signal drives triode Q2 work through capacitor C 1, resistance R 2, D1, the output of triode Q2 also is a pulse signal, works through capacitor C 1 filtering driving switch pipe triode Q1.During microwave oven work, the computer control board sends the pulse signal that has power information, triode Q1 conducting, the variable frequency power supply control unit must be established beginning work by cable, and when stopping microwave oven work, computer control board pulse-free signal sends, variable frequency power supply plate control unit dead electricity quits work.The characteristics of present embodiment are to have only continual pulse signal just can drive electronic switching transistor Q1 work, have further improved the reliability of variable frequency power supply plate control.
Variable frequency power supply plate accessory power supply also provides one tunnel independently 12V voltage supply computer control board work.
The control unit of variable frequency power supply plate comprises PWM or PFM generator.Send with the pwm signal of the different capacity of different duty representative or with the PFM signal of the different capacity of different frequency representative by the microprocessor of computer-controlled circuit, send the control unit of frequency conversion plate power supply to through first optocoupler, control unit is converted to corresponding power information control of conversion power panel by specified power work after receiving PWM or PFM signal.
When the variable frequency power supply plate is working properly, control unit sends a PWM or PFM ripple, pass to the computer-controlled circuit microprocessor through second optocoupler, after the computer-controlled circuit microprocessor is received this signal, be converted into corresponding frequency conversion plate work state information, information such as PWM or PFM Pori face comprise that the work of frequency conversion plate is whether normal, frequency conversion plate temperature and power.
Claims (10)
1. a variable frequency microwave stove power supply comprises ac input circuit, variable frequency power supply, computer-controlled circuit and accessory power supply, and variable frequency power supply comprises current rectifying and wave filtering circuit, power conversion circuit and control unit; The power input of control unit connects the output of accessory power supply, it is characterized in that, comprises first stove door switch, and first stove door switch is serially connected between the feeder ear of the power input of control unit and control unit.
2. variable frequency microwave stove power supply according to claim 1, it is characterized in that, comprise electronic switch and voltage stabilizing circuit, the signal input end of electronic switch connects the power information pulse signal output end of computer-controlled circuit microprocessor, the input termination accessory power supply of electronic switch, the output of electronic switch connects the power input of control unit through first stove door switch; Described voltage stabilizing circuit is connected on the output of electronic switch or the power input of control unit.
3. variable frequency microwave stove power supply according to claim 2, it is characterized in that, electronic switch comprises first optocoupler, PNP triode, NPN triode, capacitance, smoothing capacity, first resistance and diode, the power information pulse signal output end of the input termination computer-controlled circuit microprocessor of first optocoupler, the collector electrode of the first optocoupler phototriode connects the positive pole of auxiliary power output end by first resistance; The emitter of PNP triode connects the positive pole of auxiliary power output end, and collector electrode connects the power input of control unit by first stove door switch, and base stage connects the collector electrode of NPN triode; The grounded emitter of NPN triode, base stage connect the collector electrode of the first optocoupler phototriode by capacitance; The emitter of one termination NPN triode of smoothing capacity, the collector electrode of another termination NPN triode; The anode of diode connects the emitter of NPN triode, and negative electrode connects the base stage of NPN triode.
4. variable frequency microwave stove power supply according to claim 3, it is characterized in that, voltage stabilizing circuit comprises three terminal regulator, the 4th resistance, first electrochemical capacitor and second electrochemical capacitor, the voltage input end of three terminal regulator connects first end of the 4th resistance, and second end of the 4th resistance connects the collector electrode of PNP triode by first stove door switch; The positive pole of control unit high-voltage power supply input connects the voltage input end of three terminal regulator, the voltage output end of LVPS input termination three terminal regulator, earth terminal ground connection; The earth terminal ground connection of three terminal regulator, the positive pole of first electrochemical capacitor connects the voltage input end of three terminal regulator U3, other end ground connection; The positive pole of second electrochemical capacitor connects the voltage output end of three terminal regulator U3, other end ground connection.
5. variable frequency microwave stove power supply according to claim 3 is characterized in that, comprises the power information transmitting line, the collector electrode of a termination first optocoupler phototriode of power information transmitting line, another termination control unit power information receiving terminal.
6. variable frequency microwave stove power supply according to claim 3, it is characterized in that, comprise frequency conversion plate feedback information circuit, frequency conversion plate feedback information circuit comprises second optocoupler, the input termination control unit frequency conversion plate information transmitting terminal of second optocoupler, the frequency conversion plate information receiving end of output termination computer-controlled circuit microprocessor.
7. variable frequency microwave stove power supply according to claim 1 and 2 is characterized in that, comprises and second stove door switch that comprises the interlock of first stove door switch, the positive pole of the power input of a termination control unit of second stove door switch, other end ground connection.
8. variable frequency microwave stove power supply according to claim 1 and 2 is characterized in that, comprises and the 3rd stove door switch that comprises the interlock of first stove door switch that the 3rd stove door switch connects computer-controlled circuit.
9. variable frequency microwave stove power supply according to claim 1 and 2, it is characterized in that, the feeder ear of described control unit is the output of accessory power supply, and the power input of accessory power supply connects the output of described current rectifying and wave filtering circuit or the output of described ac input circuit.
10. variable frequency microwave stove power supply according to claim 9 is characterized in that the power output end of accessory power supply also connects computer-controlled circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320067245 CN203104844U (en) | 2013-02-05 | 2013-02-05 | Frequency conversion microwave oven power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320067245 CN203104844U (en) | 2013-02-05 | 2013-02-05 | Frequency conversion microwave oven power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203104844U true CN203104844U (en) | 2013-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320067245 Expired - Lifetime CN203104844U (en) | 2013-02-05 | 2013-02-05 | Frequency conversion microwave oven power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203104844U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109041316A (en) * | 2018-06-20 | 2018-12-18 | 广东美的厨房电器制造有限公司 | Control method, system and the micro-wave oven of microwave output |
| CN112087159A (en) * | 2020-11-16 | 2020-12-15 | 季华实验室 | Leakage wave detection circuit and method for radio frequency power supply and radio frequency power supply |
-
2013
- 2013-02-05 CN CN 201320067245 patent/CN203104844U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109041316A (en) * | 2018-06-20 | 2018-12-18 | 广东美的厨房电器制造有限公司 | Control method, system and the micro-wave oven of microwave output |
| WO2019242185A1 (en) * | 2018-06-20 | 2019-12-26 | 广东美的厨房电器制造有限公司 | Method and system for controlling microwave output, and microwave oven |
| CN112087159A (en) * | 2020-11-16 | 2020-12-15 | 季华实验室 | Leakage wave detection circuit and method for radio frequency power supply and radio frequency power supply |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130731 |