CN102361524A - Method for increasing power of electromagnetic oven and circuit thereof - Google Patents
Method for increasing power of electromagnetic oven and circuit thereof Download PDFInfo
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- CN102361524A CN102361524A CN2011103113154A CN201110311315A CN102361524A CN 102361524 A CN102361524 A CN 102361524A CN 2011103113154 A CN2011103113154 A CN 2011103113154A CN 201110311315 A CN201110311315 A CN 201110311315A CN 102361524 A CN102361524 A CN 102361524A
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Abstract
The invention relates to a method for increasing the power of an electromagnetic oven. The method comprises the following steps that: a resonance voltage and current detection circuit collects resonance voltage and transmits the resonance voltage to a CPU (Central Processing Unit) of a micro-processor to be detected, and the CPU calculates the conduction current of an IGBT (Insulated Gate Bipolar Translator) by measuring the resonance voltage; the CPU monitors the conduction current of the IGBT in real time, when the CPU detects that the conduction current of the IGBT is less than a set value, the CPU increases the driving pulse width of a driving control circuit, and the IGBT is driven under the wider pulse width; when the CPU detects that the conduction current of the IGBT is up to the set value, the CPU instantly turns off the IGBT by controlling the driving circuit, furthermore, when the IGBT is turned on during the next pulse by the CPU, the turn-on time of the IGBT is reduced, and the IGBT cannot be in over-current. On the premise of not increasing the resonance voltage, the general power of the electromagnetic oven is increased by increasing the driving power of the IGBT in the link with low voltage in the alternating current period.
Description
Technical field
The present invention relates to the electromagentic furnace technology field, particularly a kind of method and realization circuit thereof that improves electromagnetic oven power.
Background technology
The power of present electromagnetic oven generally is about 2KW, if power continues to increase, the resonance potential of IGBT is increased, and surpasses the safe voltage of IGBT, causes damaging.
Under the prior art condition, if under the prerequisite that does not increase resonance potential, improving electromagnetic oven power has two kinds of methods; The one, increase resonant capacitance, the 2nd, reduce the inductance value of electromagnetic oven wire coil, but these two kinds of methods; The capital reduces the quality factor of resonant tank, causes electromagnetic oven can only be operated under the more high-power situation, slightly small-power; Be easy to generate the situation that to accomplish resonance, cisco unity malfunction.
Therefore, designing a kind ofly can not increase the electromagnetic oven resonance potential, and the method that does not change raising electromagnetic oven power under the situation of existing electromagnetic oven resonant capacitance and drum electromagnetic quantities is problems of needing solution badly of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of method that improves electromagnetic oven power; Adopt scheme of the present invention not increasing the electromagnetic oven resonance potential; Do not change under the situation of existing electromagnetic oven resonant capacitance and drum electromagnetic quantities, only depend on and adopt different driving methods, just can power be improved about 20%.
Technical scheme of the present invention is:
A kind of method that improves electromagnetic oven power comprises the steps:
(1) gather resonance potential by the resonance potential current detection circuit and send into the microprocessor CPU detection, CPU is through measuring the conducting electric current of resonance potential and then calculating IGBT;
(2) CPU monitors the conducting electric current of IGBT in real time, and the conducting electric current that detects IGBT as CPU is less than set point, and CPU just increases the driving pulse width of Drive and Control Circuit, and IGBT drives under the pulse duration of broad;
(3) the conducting electric current that detects IGBT as CPU reaches set point, and CPU turn-offs IGBT immediately through the controlling and driving control circuit, and CPU is controlled at next pulse when opening IGBT, the service time of reducing IGBT, guarantees that IGBT can overcurrent.
Realize the circuit of the raising electromagnetic oven power of said method; Comprise: rectification circuit BD, electromagnetic oven wire coil L1, resonant capacitance C1, filter capacitor C2, resonance potential current detection circuit, IGBT and Drive and Control Circuit thereof; The output of electromagnetic oven wire coil L1 one termination rectification circuit, the other end is connected L1 parallel resonance capacitor C 1 with the C utmost point, the resonance potential current detection circuit of IGBT; The resonance potential current detection circuit connects Drive and Control Circuit, and Drive and Control Circuit is connected with the G utmost point of IGBT.
Characteristic of the present invention is that also said resonance potential current detection circuit comprises divider resistance R1, R2 and microprocessor CPU; The output of said electromagnetic oven wire coil L1 one termination rectification circuit; Divider resistance R1, R2 are connected between L1 output and the ground; The common port of R1, R2 is connected with CPU, and CPU connects Drive and Control Circuit.
Characteristic of the present invention is that also said Drive and Control Circuit comprises triode Q1 and Q2; The base stage of Q1 is connected with the base stage of Q2; The common port of Q1, Q2 collector electrode is connected with CPU, the grounded collector of Q2, and the emitter of Q1 is connected with the G utmost point of IGBT with common port after the emitter of Q2 is connected.
Characteristic of the present invention is that also said rectification circuit BD is the bridge rectifier that four diodes are formed.
The IGBT pulsewidth of carrying out of the present invention makes the duty ratio of the train of impulses arrange by the rule opposite with sinusoidal rule when driving.When sine value was maximum, the width of IGBT driving pulse was minimum, otherwise; When sine value hour, the width of IGBT driving pulse is bigger, such potential pulse series can make at power supply during sine wave changes; When sinusoidal wave low spot, enough conducting IGBT obtains higher resonant energy; And when sinusoidal wave height point, adopting less IGBT conducting width, the restriction resonance potential is too high.
The present invention can not increase the electromagnetic oven resonance potential, does not change under the situation of existing electromagnetic oven resonant capacitance and drum electromagnetic quantities, only depends on and adopts different driving methods, just can power be improved about 20%.And can guarantee IGBT when any pulse, can both be operated in maximum power output state, and can not produce the behavior that exceeds safe current or safe voltage.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the physical circuit figure of the embodiment of the invention 1.
Embodiment
According to accompanying drawing, the present invention is carried out detailed narration.
Accompanying drawing 2 is circuit diagrams of the specific embodiment of the invention 1; A kind of circuit that improves electromagnetic oven power of present embodiment comprises: rectification circuit BD, electromagnetic oven wire coil L1, resonant capacitance C1, filter capacitor C2, resonance potential current detection circuit, IGBT and Drive and Control Circuit thereof.Said resonance potential current detection circuit comprises divider resistance R1, R2 and microprocessor CPU, and said Drive and Control Circuit comprises triode Q1 and Q2.
As shown in Figure 1; Filter capacitor C2 is connected between the output and ground of rectification circuit, the output of electromagnetic oven wire coil L1 one termination rectification circuit, and the other end is connected with the C utmost point, the divider resistance R1 of IGBT; L1 parallel resonance capacitor C 1 is connected divider resistance R1, R2 between L1 output and the ground, and the common port of R1, R2 is connected with CPU; CPU connects the IGBT Drive and Control Circuit, and the base stage of Q1 is connected with the base stage of Q2, and the collector electrode of Q1 is connected with CPU; The grounded collector of Q2; The emitter of Q1 is connected with the emitter of Q2, and the emitter of Q1 is connected with the G utmost point of IGBT, and diode D1 is connected in parallel between the C utmost point and the E utmost point of IGBT.
Wherein R1 and R2 form bleeder circuit, after the resonance potential dividing potential drop, send into CPU and measure, and calculate resonance potential.
Operation principle of the present invention is that CPU drives the IGBT conducting through Drive and Control Circuit, during the IGBT conducting; Can produce pressure drop at the CE of IGBT knot, CPU can detect, calculate this pressure drop through the bleeder circuit of R1 and R2; Because the current characteristics of IGBT, electric current is big more, and the pressure drop that produces at the CE knot will be big more; Because the consistency of IGBT is fine, can pass through these characteristics, detect the conducting electric current of IGBT.
After the conducting electric current of IGBT reaches the setting electric current, turn-off IGBT, IGBT closes and has no progeny; L1 and C1 produce resonance, and CPU is through the dividing potential drop of R1 and R2, monitor whether resonance potential reaches or near set point; If resonance potential reaches or near set point, so, when opening IGBT next time; CPU will reduce the ON time of IGBT, to prevent resonance overvoltage next time.In fact, in the course of the work, be no more than safe current as long as guarantee resonance current, resonance potential just can not surpass safe voltage yet.
The variation foundation of variable impulse width is achieved in that CPU passes through Drive and Control Circuit and drives the IGBT conducting, in the driving process; The conducting electric current is measured in CE knot pressure drop through detecting IGBT; In the driving process, if detected IGBT conducting electric current less than set point, CPU controlling and driving control circuit drives IGBT according to the driving pulsewidth of broad; Like this, will export higher power.
When the conducting electric current that detects IGBT reaches set point, CPU controlling and driving control circuit turn-offs IGBT immediately, like this; Just can guarantee that IGBT can overcurrent; Because the conducting maximum current is limited, its resonant energy also has been limited, and resonance potential is determined by resonant energy; Like this, resonance potential also just has been limited.But as safeguard, when resonance, still need detect resonance potential, prevent zero load or pan not to the time, resonance current is in safe range, and resonance potential surpasses the situation of set point and takes place.
No matter reach set point at resonance current, or resonance potential reaches set point, CPU will be controlled at next pulse IGBT when opening, and reduce the service time of IGBT, guarantee that IGBT can overcurrent.
That is to say; Each IGBT that drives, CPU can drive IGBT according to the ON time of maximum, when detecting the conducting electric current and reach set point; Just turn-off IGBT immediately through the controlling and driving control circuit; And when next pulse IGBT opens, reduce the service time of IGBT, guarantee that IGBT can overcurrent.
In this way, just can guarantee IGBT when any pulse, can both be operated in maximum power output state, and can not produce the behavior that exceeds safe current or safe voltage.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (5)
1. a method that improves electromagnetic oven power is characterized in that comprising the steps:
(1) gather resonance potential by the resonance potential current detection circuit and send into the microprocessor CPU detection, CPU is through measuring the conducting electric current of resonance potential and then calculating IGBT;
(2) CPU monitors the conducting electric current of IGBT in real time, and the conducting electric current that detects IGBT as CPU is less than set point, and CPU just increases the driving pulse width of Drive and Control Circuit, and IGBT drives under the pulse duration of broad;
(3) the conducting electric current that detects IGBT as CPU reaches set point, and CPU turn-offs IGBT immediately through control Driver Circuit, and CPU is controlled at next pulse when opening IGBT, the service time of reducing IGBT, guarantees that IGBT can overcurrent.
2. circuit of realizing the raising electromagnetic oven power of the said method of claim 1; It is characterized in that comprising: rectification circuit BD, electromagnetic oven wire coil L1, resonant capacitance C1, filter capacitor C2, resonance potential current detection circuit, IGBT and Drive and Control Circuit thereof; The output of electromagnetic oven wire coil L1 one termination rectification circuit; The other end is connected with the C utmost point, the resonance potential current detection circuit of IGBT; L1 parallel resonance capacitor C 1, the resonance potential current detection circuit connects Drive and Control Circuit, and Drive and Control Circuit is connected with the G utmost point of IGBT.
3. a kind of circuit that improves electromagnetic oven power according to claim 2; It is characterized in that: said resonance potential current detection circuit comprises divider resistance R1, R2 and microprocessor CPU; The output of said electromagnetic oven wire coil L1 one termination rectification circuit; Divider resistance R1, R2 are connected between L1 output and the ground, and the common port of R1, R2 is connected with CPU, and CPU connects Drive and Control Circuit.
4. according to claim 2 or 3 described a kind of circuit that improve electromagnetic oven power; It is characterized in that: said Drive and Control Circuit comprises triode Q1 and Q2; The base stage of Q1 is connected with the base stage of Q2; The common port of Q1, Q2 collector electrode is connected with CPU, the grounded collector of Q2, and the emitter of Q1 is connected with the G utmost point of IGBT with common port after the emitter of Q2 is connected.
5. a kind of circuit that improves electromagnetic oven power according to claim 4 is characterized in that: said rectification circuit BD is the bridge rectifier that four diodes are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103113154A CN102361524A (en) | 2011-10-14 | 2011-10-14 | Method for increasing power of electromagnetic oven and circuit thereof |
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| CN2011103113154A CN102361524A (en) | 2011-10-14 | 2011-10-14 | Method for increasing power of electromagnetic oven and circuit thereof |
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| CN2011103113154A Pending CN102361524A (en) | 2011-10-14 | 2011-10-14 | Method for increasing power of electromagnetic oven and circuit thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039032A (en) * | 2014-05-28 | 2014-09-10 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating circuit and control method and control device thereof |
| CN104244481A (en) * | 2013-06-14 | 2014-12-24 | 美的集团股份有限公司 | Electromagnetic induction heating device and heating control method thereof |
| CN104302028A (en) * | 2013-07-17 | 2015-01-21 | 广东美的厨房电器制造有限公司 | High-frequency heating equipment, power supply control method thereof, and power supply control device |
| CN104883762A (en) * | 2015-06-10 | 2015-09-02 | 容小明 | Induction cooker control method and control apparatus, and induction cooker apparatus |
| CN107087321A (en) * | 2017-05-19 | 2017-08-22 | 浙江绍兴苏泊尔生活电器有限公司 | Method for adjusting hard turn-on voltage of IGBT (insulated Gate Bipolar transistor) and induction cooker |
| CN107484284A (en) * | 2017-08-16 | 2017-12-15 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic oven |
| CN108523626A (en) * | 2017-03-02 | 2018-09-14 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device and its inspection Pot devices and method |
| CN109699095A (en) * | 2017-10-23 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus and its method for heating and controlling and device |
| CN113923812A (en) * | 2021-10-29 | 2022-01-11 | 广东美的厨房电器制造有限公司 | Microwave heating device, control method and storage medium |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244481A (en) * | 2013-06-14 | 2014-12-24 | 美的集团股份有限公司 | Electromagnetic induction heating device and heating control method thereof |
| CN104244481B (en) * | 2013-06-14 | 2016-02-10 | 美的集团股份有限公司 | The method for heating and controlling of electromagnetic induction heater and electromagnetic induction heater |
| CN104302028A (en) * | 2013-07-17 | 2015-01-21 | 广东美的厨房电器制造有限公司 | High-frequency heating equipment, power supply control method thereof, and power supply control device |
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| EP3024299A4 (en) * | 2013-07-17 | 2017-03-29 | Midea Group Co., Ltd. | High-frequency heating device and power supply control method and power supply control apparatus for same |
| US10257889B2 (en) | 2013-07-17 | 2019-04-09 | Midea Group Co., Ltd. | High-frequency heating device and method and apparatus for controlling power supply of the same |
| CN104039032B (en) * | 2014-05-28 | 2016-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating circuit and control method thereof and control device |
| CN104039032A (en) * | 2014-05-28 | 2014-09-10 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating circuit and control method and control device thereof |
| CN104883762A (en) * | 2015-06-10 | 2015-09-02 | 容小明 | Induction cooker control method and control apparatus, and induction cooker apparatus |
| CN108523626A (en) * | 2017-03-02 | 2018-09-14 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device and its inspection Pot devices and method |
| CN107087321A (en) * | 2017-05-19 | 2017-08-22 | 浙江绍兴苏泊尔生活电器有限公司 | Method for adjusting hard turn-on voltage of IGBT (insulated Gate Bipolar transistor) and induction cooker |
| CN107087321B (en) * | 2017-05-19 | 2023-06-27 | 浙江绍兴苏泊尔生活电器有限公司 | Method for adjusting hard turn-on voltage of IGBT and induction cooker |
| CN107484284A (en) * | 2017-08-16 | 2017-12-15 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic oven |
| CN107484284B (en) * | 2017-08-16 | 2020-07-28 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic oven |
| CN109699095A (en) * | 2017-10-23 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus and its method for heating and controlling and device |
| CN109699095B (en) * | 2017-10-23 | 2021-06-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment and heating control method and device thereof |
| CN113923812A (en) * | 2021-10-29 | 2022-01-11 | 广东美的厨房电器制造有限公司 | Microwave heating device, control method and storage medium |
| CN113923812B (en) * | 2021-10-29 | 2024-05-31 | 广东美的厨房电器制造有限公司 | Microwave heating apparatus, control method, and storage medium |
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Application publication date: 20120222 |