CN205481176U - Electromagnetic oven - Google Patents
Electromagnetic oven Download PDFInfo
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- CN205481176U CN205481176U CN201620181739.1U CN201620181739U CN205481176U CN 205481176 U CN205481176 U CN 205481176U CN 201620181739 U CN201620181739 U CN 201620181739U CN 205481176 U CN205481176 U CN 205481176U
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- 238000005070 sampling Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000005669 field effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Control Of Resistance Heating (AREA)
Abstract
The utility model provides an electromagnetic oven, utilize the electric current sampling circuit, implement the electric current in the monitoring electromagnetic oven power circuit, and utilize reference circuit to provide changeable benchmark value for the electric current sampling circuit, make control circuit can be according to the current value and the benchmark value that flow in the electromagnetic oven, confirm the turn-off time of switching element in every switching cycle, and the disconnection of control switching element, thereby make the on-time in every cycle of switching element relevant with the electric current that flows in the electromagnetic oven, the energy of input electromagnetic oven has been improved, the power level and the electric wire netting efficiency of electromagnetic oven have been improved.
Description
Technical field
This utility model relates to circuit structure technical field, particularly relates to a kind of electromagnetic oven.
Background technology
Electromagnetic oven has another name called electromagnetic stove, is the product of modern kitchen revolution, and it heats without naked light or conduction-type and allow heat directly produce in the bottom of a pan, and therefore the thermal efficiency is greatly improved.
Electromagnetic oven is the electric cooking apparatus utilizing electromagnetic inductive heating principle to make.Fig. 1 is usual electromagnetic oven circuit structural representation.As it is shown in figure 1, electromagnetic oven generally by: rectification circuit, filter circuit, resonance circuit, on-off circuit and control circuit form.Wherein, resonance circuit includes resonant capacitance and heating spool rest composition.The alternating current of the 50Hz of input electromagnetic oven, after commutator and filter circuit, becomes the unidirectional current of periodically pulsing.Switching tube in on-off circuit is under control circuit control, with fixing ON time conducting within a unidirectional current cycle, thus resonance circuit forms LC vibration, heating spool rest is formed the electric current of high frequency change, the electric current of change makes again heating spool rest produce the electromagnetic wave of change, and then produce a large amount of eddy current in the bottom of a pan, thus the heat needed for producing culinary art.
But, owing to, within the cycle of whole DC voltage envelope, the ON time of switching tube is identical, when DC voltage is in non-crest location, the energy inputing to heating spool rest is less, thus limits the raising of electromagnetic oven power, also reduces electrical network utilization rate.
Utility model content
In order to solve at least one problem mentioned in background technology, this utility model provides a kind of electromagnetic oven, and the ON time of each turn-on cycle of power circuit breaker in middle device is current related with each harmonic period, adds the power of electromagnetic oven.
This utility model provides a kind of electromagnetic oven, including: power circuit, control circuit, current sampling circuit and reference circuit；
Described power circuit, provides electric current for the heating spool rest for electromagnetic oven；
Described control circuit, for the control signal according to the first outfan output, controls the turn-on and turn-off of power circuit breaker in middle device；
The input of described current sampling circuit is connected with described power circuit, for detecting the electric current in each harmonic period internal power circuit；
The outfan of described current sampling circuit is connected with described control circuit first input end；
Described reference circuit input is connected with described control circuit the second outfan, described reference circuit outfan is connected with described control circuit the second input, so that control circuit is according to first input end input value and the second input input value, controls power circuit breaker in middle device and disconnect.
The electromagnetic oven that this utility model provides, utilize current sampling circuit, implement the electric current in monitoring electromagnetic oven power circuit, and utilize reference circuit to provide transformable reference value for current sampling circuit, make the control circuit can be according to flowing into the current value of electromagnetic oven and reference value, determine the turn-off time of switching device in each switch periods, and control the disconnection of switching device, so that ON time in each cycle of switching device with flow into the current related of electromagnetic oven, improve the energy of input electromagnetic oven, improve power grade and the electrical network efficiency of electromagnetic oven.
Optionally, described current sampling circuit, including: the first resistance, the second resistance and the 3rd resistance；
One end with described power circuit and the second resistance respectively, described first resistance one end is connected, and the other end of described first resistance is connected to ground；
The other end of described second resistance and the first input end of one end of the 3rd resistance and control circuit connect；
The other end of described 3rd resistance is connected with reference power source.
Optionally, described current sampling circuit also includes: the first electric capacity；
One end of described first electric capacity is connected with the other end of described second resistance and one end of the 3rd resistance, and the other end of described first electric capacity is connected to ground.
Optionally, described reference circuit includes: the 4th resistance and the second electric capacity；
Described one end of 4th resistance is connected with the second outfan of described control circuit, and the other end of described 4th resistance is connected with one end of described second electric capacity and the second input of described control circuit；
The other end of described second electric capacity is connected to ground.
Optionally, described control circuit includes: operational amplifier；
The other end of described second resistance and the input of one end of the 3rd resistance and operational amplifier connect.
Optionally, described power circuit includes rectification unit, filter unit, LC resonant element and switch element；
Described rectification unit, filter unit and LC resonant element are sequentially connected with；
The end that controls of described switch element is connected with the first outfan of described control circuit, and the outfan of described switch element is connected with described LC resonant element.
Structure of the present utility model and its other utility model purposes and beneficial effect will by combine accompanying drawing and description of preferred embodiments and become apparent from understandable.
Accompanying drawing explanation
Fig. 1 is usual electromagnetic oven circuit structural representation；
The electromagnetic oven circuit structural representation that Fig. 2 provides for this utility model first embodiment；
The electromagnetic oven circuit structural representation that Fig. 3 provides for this utility model the second embodiment；
The structural representation of the electromagnetic oven circuit that Fig. 4 provides for this utility model the 3rd embodiment；
The structural representation of the electromagnetic oven circuit that Fig. 5 provides for this utility model the 4th embodiment.
Reference:
1-power circuit；11-rectification unit；12-filter unit；
13-LC resonant element；14-switch element；131-the 3rd electric capacity；
132-heating spool rest；2-control circuit；3-current sampling circuit；
31-the first resistance；32-the second resistance；33-the 3rd resistance；
34-the first electric capacity；4-reference circuit；41-the 4th resistance；
42-the second electric capacity；5-voltage sampling circuit.
Detailed description of the invention
First embodiment
The electromagnetic oven circuit structural representation that Fig. 2 provides for this utility model first embodiment.As in figure 2 it is shown, the electromagnetic oven that the present embodiment provides, including: power circuit 1, control circuit 2, current sampling circuit 3 and reference circuit 4.
Wherein, described power circuit 1, provide electric current for the heating spool rest for electromagnetic oven；Described control circuit 2, for the control signal according to the first outfan output, controls the turn-on and turn-off of power circuit 1 breaker in middle device；The input of described current sampling circuit 3 is connected with described power circuit 1, for detecting the electric current in the power circuit 1 in each harmonic period；The outfan of described current sampling circuit 3 is connected with described control circuit 2 first input end；Described reference circuit 4 input is connected with described control circuit 2 second outfan, described reference circuit 4 outfan is connected with described control circuit 2 second input, so that control circuit 2 is according to first input end input value and the second input input value, controls power circuit 1 breaker in middle device and disconnect.
Concrete, as it is shown on figure 3, the electromagnetic oven circuit structural representation that Fig. 3 provides for second embodiment of the invention.As it is shown on figure 3, power circuit 1 includes: include rectification unit 11, filter unit 12, LC resonant element 13 and switch element 14.
Wherein, described rectification unit 11, filter unit 12 and LC resonant element 13 are sequentially connected with；The end that controls of described switch element 14 is connected with the first outfan of described control circuit 2, and the outfan of described switch element 14 is connected with described LC resonant element.
Switching device in switch element 14, can be IGCT (Silicon Controlled Rectifier, be called for short SCR), Metal-Oxide Semiconductor field-effect transistor, it is called for short metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, it is called for short MOSFET) or be insulated gate bipolar transistor (Insulated Gate Bipolar Transistor is called for short IGBT).
Concrete, resonant element 13 includes the 3rd electric capacity 131 and the heating spool rest 132 being connected in parallel.
nullTime actually used，The work process of power circuit is: after the rectified unit of alternating current 11 of input electromagnetic oven and filter unit 12，Become the unidirectional current of periodically pulsing，This unidirectional current is when switch element 14 turns on，Resonance potential is provided for resonant element 13，So that the electric current in heating spool rest 132 is gradually increased，When switch element 14 disconnects，Owing to heating spool rest 132 does not allow current break,Current direction the 3rd electric capacity 131,Energy transfers to the 3rd electric capacity 131，When in heating spool rest 132, electric current is minimized,When namely the energy of heating spool rest 131 all discharges，Switch element 14 backward voltage reaches the highest，3rd electric capacity 131 begins through heating spool rest 132 and discharges afterwards，In heating spool rest 132, electric current is reverse，The energy of the 3rd electric capacity 131 is transferred on heating spool rest 132，When switch element 14 backward voltage is minimum，3rd electric capacity 131 is that the electric current of heating spool rest 132 charging reaches maximum，Now，Switch element 14 is the most open-minded，But the effect due to heating spool rest 132,Do not allow current break，The reverse current in heating spool rest 132 is made to continue to charge until being 0 to the 3rd electric capacity 131.By above-mentioned analysis, in a turn-on cycle of switch element 14, the unidirectional current of pulsation is only when switching means conductive, energy is provided for resonance circuit, therefore the ON time of switch element determines Rectified alternating current and provides the size of energy for resonance circuit, i.e. determines the size of electromagnetic oven power.
This utility model operation principle based on above-mentioned electromagnetic oven power circuit, by using current sampling circuit 3 to monitor the electric current in electromagnetic oven power circuit 1, and by the current feedback of monitoring to control circuit 2, make control circuit 2 according to the size of current in power circuit 1, control to disconnect switching device, thus ensure unidirectional current in the switch periods of each switching device, for resonant element 13 provide energy coincidence.
Concrete, the second outfan exportable low and high level signal of control circuit 2, think that reference circuit 4 provides input.Such as can utilize the PWM module in control circuit 2, the pwm signal of generation is as the input of reference circuit 4.The low and high level signal that control circuit 2 is exported by reference circuit 4 is integrated processing, obtain a transformable analogue signal, input to second input benchmark as current sampling circuit 3 sampled current value of control circuit 2 again, current value and the analogue signal of the input of the second input that first input end is inputted by control circuit 2 compare, so that it is determined that the disconnection moment of switch element 14.
For example, if controlling logic is that switch element 14 disconnects when the analogue signal that the current value of current sampling circuit 3 output exports higher than reference circuit 4.Then when the DC voltage of filter unit 12 output is relatively low, from the beginning of switch element 14 turn-on instant, flow into the electric current in heating spool rest 132 and need to can be only achieved, through the longer moment, the reference value that reference circuit 4 exports, i.e. control circuit 2 is in this case, longer time interval need to be experienced and just can export the control signal turning off switch element 14, control switch element 14 and disconnect.And when the DC voltage of filter unit 12 output is higher, from the beginning of switch element 14 turn-on instant, flow into the electric current in heating spool rest 132 and will soon reach the reference value of reference circuit 4 output, i.e. control circuit 2 is in this case, after relatively short period of time is spaced, the control signal turning off switch element 14 will be exported, control switch element 14 and disconnect.I.e. in the envelope of DC voltage, when DC voltage is less, extend the ON time of switch element, increase DC supply input to heating spool rest energy, thus improve the power of electromagnetic oven and the utilization rate of electrical network.
The electromagnetic oven that the present embodiment provides, utilize current sampling circuit, implement the electric current in monitoring electromagnetic oven power circuit, and utilize reference circuit to provide transformable reference value for current sampling circuit, make the control circuit can be according to flowing into the current value of electromagnetic oven and reference value, determine the turn-off time of switching device in each switch periods, and control the disconnection of switching device, so that ON time in each cycle of switching device with flow into the current related of electromagnetic oven, improve the energy of input electromagnetic oven, improve power grade and the electrical network efficiency of electromagnetic oven.
Additionally, by above-mentioned analysis it can also be seen that, the half period that resonant element 13 freely shakes is the time that crest voltage occurs in switch element 14, also it it is the turn-off time of switch element 14, if crest voltage does not the most disappear, and the pulse of opening controlling switch element 14 arrives, and switch element 14 will be made to be in hard opening state, there will be the biggest immediate current causes switch element 14 breaker in middle device to burn out, it is therefore necessary to ensure that the forward position opening pulse is Tong Bu with crest voltage pulse back edge.Therefore, control circuit 2 also needs to monitor the voltage of resonant element 13, so that it is determined that the service time of switch element 14.
Concrete, voltage sampling circuit 5 can be set in electromagnetic oven with form as shown in Figure 4.The electromagnetic oven circuit structural representation that Fig. 4 provides for this utility model the 3rd embodiment.As shown in Figure 4, two ends with resonant element 13 respectively, the two ends of this voltage sampling circuit 5 are connected, to obtain to obtain the minimum synchronizing signal of the backward voltage of switching device from resonant element 13, and provide prime drive waveforms according to synchronizing signal for switching device, so that while switching device realizes soft opening in each turn-on cycle, select the suitable turn-off time, so that Rectified alternating current all provides the biggest energy for electromagnetic oven in the turn-on cycle of any switching device, thus the raising for electromagnetic oven power grade provides condition, and improve electrical network utilization rate.
The electromagnetic oven circuit structural representation that Fig. 5 provides for this utility model the 4th embodiment.As it is shown in figure 5, above-mentioned current sampling circuit 3, including: the first resistance the 31, second resistance 32 and the 3rd resistance 33；One end with described power circuit 1 and the second resistance 32 respectively, described first resistance 31 one end is connected, and the other end of described first resistance 31 is connected with ground GND；The other end of described second resistance 32 and the first input end of one end of the 3rd resistance 33 and control circuit 2 connect；The other end of described 3rd resistance 33 is connected with reference power source VCC.
Concrete, first resistance the 31, second resistance 32 and the 3rd resistance 33 constitute current sample and potential-divider network, one end of first resistance 31 can be connected with the outfan of the resonant element 13 in power circuit 1, or can also be connected with the outfan of filter unit 12, or, can also be as it is shown in figure 5, be connected with the outfan arranging unit 11, the electric current flow through in the voltage response at the first resistance 31 two ends electromagnetic oven power circuit 1.Wherein, when the first resistance 31 increases, the voltage of corresponding current detecting can improve.
Additionally, by above-mentioned analysis, flow through electric current in heating spool rest 132 and include both direction, therefore, the voltage that the first resistance 31 detects has two kinds of situations of positive and negative, when the first resistance 31 detects voltage for time negative, the normal work of control chip in control circuit 2 can be affected, therefore the other end of the 3rd resistance 33 is connected with reference power source VCC, provides a reference value by VCC for current sampling circuit 3, the magnitude of voltage making current sampling circuit 3 under any circumstance export be all on the occasion of.
Further, owing in power circuit 1, electric current has certain harmonic wave, in order to the magnitude of voltage making current sampling circuit 3 export is stable, above-mentioned current sampling circuit 3 also includes: the first electric capacity 34.
One end of described first electric capacity 34 is connected with the described other end of the second resistance 32 and one end of the 3rd resistance 33, and the other end of described first electric capacity 34 is connected with ground GND.
Concrete, by accessing the first electric capacity 34 in current sampling circuit 3, current sampling circuit 3 is filtered.It addition, it will be appreciated by persons skilled in the art that and can also smooth the voltage at the first resistance 31 two ends by the first resistance 31 two ends shunt capacitance.
Further, in order to reduce the power attenuation that the first resistance 31 brings, the first resistance value is smaller, so that the magnitude of voltage of current sampling circuit 3 output is relatively low, therefore, in control circuit 2, including: operational amplifier.
The other end of described second resistance 32 and the input of one end of the 3rd resistance 33 and operational amplifier connect.
It addition, said reference circuit 4 includes: the 4th resistance 41 and the second electric capacity 42.
One end of described 4th resistance 41 is connected with the second outfan of described control circuit 2, and the other end of described 4th resistance 41 is connected with described one end of second electric capacity 42 and the second input of described control circuit 2；The other end of described second electric capacity 42 is connected with ground GND.
In the present embodiment, using the simple combination of resistance and electric capacity to constitute reference circuit, circuit structure is simple, low cost.
The electromagnetic oven that the present embodiment provides, utilize the current sampling circuit of simple in construction, implement the electric current in monitoring electromagnetic oven power circuit, and utilize the reference circuit of simple in construction to provide transformable reference value for current sampling circuit, make the control circuit can be according to flowing into the current value of electromagnetic oven and reference value, determine the turn-off time of switching device in each switch periods, and control the disconnection of switching device, so that ON time in each cycle of switching device with flow into the current related of electromagnetic oven, improve the energy of input electromagnetic oven, improve power grade and the electrical network efficiency of electromagnetic oven.
Last it is noted that various embodiments above is only in order to illustrate the technical solution of the utility model, it is not intended to limit；Although this utility model being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or the most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of this utility model each embodiment technical scheme.
Claims (6)
1. an electromagnetic oven, it is characterised in that including: power circuit, control circuit, current sampling circuit and reference circuit；
Described power circuit, provides electric current for the heating spool rest for electromagnetic oven；
Described control circuit, for the control signal according to the first outfan output, controls the turn-on and turn-off of power circuit breaker in middle device；
The input of described current sampling circuit is connected with described power circuit, for detecting the electric current in each harmonic period internal power circuit；
The outfan of described current sampling circuit is connected with described control circuit first input end；
Described reference circuit input is connected with described control circuit the second outfan, described reference circuit outfan is connected with described control circuit the second input, so that control circuit is according to first input end input value and the second input input value, controls power circuit breaker in middle device and disconnect.
Electromagnetic oven the most according to claim 1, it is characterised in that described current sampling circuit, including: the first resistance, the second resistance and the 3rd resistance；
One end with described power circuit and the second resistance respectively, described first resistance one end is connected, and the other end of described first resistance is connected to ground；
The other end of described second resistance and the first input end of one end of the 3rd resistance and control circuit connect；
The other end of described 3rd resistance is connected with reference power source.
Electromagnetic oven the most according to claim 2, it is characterised in that described current sampling circuit also includes: the first electric capacity；
One end of described first electric capacity is connected with the other end of described second resistance and one end of the 3rd resistance, and the other end of described first electric capacity is connected to ground.
4. according to the arbitrary described electromagnetic oven of claim 1-3, it is characterised in that described reference circuit includes: the 4th resistance and the second electric capacity；
Described one end of 4th resistance is connected with the second outfan of described control circuit, and the other end of described 4th resistance is connected with one end of described second electric capacity and the second input of described control circuit；
The other end of described second electric capacity is connected to ground.
Electromagnetic oven the most according to claim 4, it is characterised in that described control circuit includes: operational amplifier；
The other end of described second resistance and the input of one end of the 3rd resistance and operational amplifier connect.
Electromagnetic oven the most according to claim 5, it is characterised in that described power circuit includes rectification unit, filter unit, LC resonant element and switch element；
Described rectification unit, filter unit and LC resonant element are sequentially connected with；
The end that controls of described switch element is connected with the first outfan of described control circuit, and the outfan of described switch element is connected with described LC resonant element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620181739.1U CN205481176U (en) | 2016-03-09 | 2016-03-09 | Electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620181739.1U CN205481176U (en) | 2016-03-09 | 2016-03-09 | Electromagnetic oven |
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| Publication Number | Publication Date |
|---|---|
| CN205481176U true CN205481176U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620181739.1U Active CN205481176U (en) | 2016-03-09 | 2016-03-09 | Electromagnetic oven |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111385924A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and control method and device thereof |
| EP3644071A4 (en) * | 2017-07-26 | 2020-07-22 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Ltd. | Sampling current processing circuit, power detection circuit and electromagnetic cooking device |
-
2016
- 2016-03-09 CN CN201620181739.1U patent/CN205481176U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3644071A4 (en) * | 2017-07-26 | 2020-07-22 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Ltd. | Sampling current processing circuit, power detection circuit and electromagnetic cooking device |
| CN111385924A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and control method and device thereof |
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