CN100539768C - A kind of electromagnetic oven synchronisation control means and circuit thereof - Google Patents

A kind of electromagnetic oven synchronisation control means and circuit thereof Download PDF

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Publication number
CN100539768C
CN100539768C CNB2007101243104A CN200710124310A CN100539768C CN 100539768 C CN100539768 C CN 100539768C CN B2007101243104 A CNB2007101243104 A CN B2007101243104A CN 200710124310 A CN200710124310 A CN 200710124310A CN 100539768 C CN100539768 C CN 100539768C
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China
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circuit
signal
output
control unit
mcu
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CNB2007101243104A
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Chinese (zh)
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CN101159998A (en
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伍炎军
曾佳
刘建伟
吴健红
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深圳和而泰智能控制股份有限公司
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Publication of CN101159998A publication Critical patent/CN101159998A/en
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Abstract

The invention discloses a kind of electromagnetic oven synchronisation control means and circuit thereof.Circuit comprises current rectifying and wave filtering circuit, resonant circuit, switching device, drive circuit, synchronous signal circuit and MCU control unit.Synchronisation control means is: synchronous signal circuit detects the resonance potential of resonant circuit; After resonance potential reduced the arrival set point, synchronous signal circuit produced the sync break pulse signal; The MCU control unit detects the sync break pulse signal, and the high level continuity signal of output specific width is given drive circuit, drive circuit control switch break-over of device; After high level continuity signal finishes, switching device by, resonant circuit produces a resonance; Repeat said process.The present invention adopts MCU control unit output high level continuity signal to give the conducting of the direct control switch device of drive circuit and end, and has brought into play the stable advantage of MCU operating frequency, improves the accuracy of synchronizing process; Make circuit simple, debugging is convenient, and cost reduces.

Description

A kind of electromagnetic oven synchronisation control means and circuit thereof
Technical field
The present invention relates to synchronisation control means and circuit, especially relate to a kind of electromagnetic oven synchronisation control means and circuit thereof.
Background technology
The general circuit principle of electromagnetic oven is: civil power is transformed to direct current through bridge rectifier filter circuit, is transformed to high-frequency alternating current through the voltage resonance converter again.The voltage resonance converter is generally power switch pipe, such as IGBT pipe, by controller by drive circuit control its conducting with by.Synchronous control unit is one of circuit unit crucial in the electromagnetic oven circuit, and it mainly acts on is to obtain synchronizing signal from the LC oscillation circuit, and produces synchronous sawtooth waveforms, for the conducting of IGBT pipe provides correct ON time.
In the prior art, the Synchronization Control of electromagnetic oven is to utilize hardware synchronization signal controlling oscillating circuit, and its principle as shown in Figure 1.The signal that synchronous circuit outputs to the backward end of comparator U1 is a sawtooth waveforms.Synchronizing signal is produced by comparator UC1, and its signal is taken from the voltage at capacitor C 8 two ends of the LC oscillating circuit of being made up of capacitor C 8 and drum inductance XL, signal is input to the backward end and the forward end of comparator after resistance R 2, R5, R1, R3, R4 and R6 dividing potential drop.Electromagnetic oven is after the plug-in start, single-chip microcomputer sends the probe signal TEST of several microsecond high level, be added to comparator UC1 backward end by capacitor C 11, comparator UC1 backward end is higher than forward end, the upset output low level takes place in comparator UC1, makes the backward end of comparator U1 obtain a negative pulse by capacitor C 5.The forward end of comparator U1 is higher than backward end, and the output high level makes switching tube IGBT start conducting.Collector electrode approaches 0V voltage after the switching tube IGBT conducting, after resistance R 2, R5, R1, R3, R4 and R6 dividing potential drop comparator UC1 backward end dividing potential drop greater than comparator forward end dividing potential drop, comparator UC1 output low level, 18V voltage through resistance R 9 to capacitor C 5 charging.When the rising of capacitor C 5 voltages, when the backward end voltage of comparator U1 surpasses forward end voltage, comparator U1 output low level, switching tube IGBT ends, and the energy that stores among the coil inductance XL gives capacitor C 8 chargings, and the LC oscillation circuit produces and vibrates.Only otherwise cut off the power supply of whole oscillating circuit, so whole oscillation circuit will go down with the mode work of damped oscillation.
When pot, Single-chip Controlling is soundd out pulse signal TEST output high level signal, and export suitable PWM duty cycle signals, switching tube IGBT conducting, switching tube IGBT collector electrode approaches 0V voltage, comparator UC1 output low level makes the backward end of comparator U1 obtain a negative pulse by capacitor C 5, and 18V voltage charges to capacitor C 5 through resistance R 9.When the rising of capacitor C 5 voltages, when the backward end voltage of comparator U1 surpasses forward end voltage, comparator U1 output low level, switching tube IGBT ends, and drum inductance XL charges to capacitor C 8.After capacitor C 8 was charged to the voltage peak, 8 pairs of drum inductance of capacitor C XL discharged.When the forward end voltage of comparator UC1 was lower than backward end voltage, comparator UC1 output low level made comparator U1 backward end produce a negative pulse by capacitor C 5, and comparator U1 exports high level, switching tube IGBT conducting once more.Repeat this process electromagnetic oven and get final product work, the pwm signal of single-chip microcomputer output will determine the power of electromagnetic oven.
The major defect of prior art is: utilize hardware circuit to realize Synchronization Control, and the circuit complexity, cost is higher; The circuit debugging complexity is damaged switching tube IGBT easily; For a long time make hardware synchronous circuit depart from the resonance frequency of LC oscillation circuit.
Summary of the invention
Technical problem to be solved by this invention is to remedy above-mentioned defective, proposes a kind of electromagnetic oven synchronisation control means and circuit thereof.
Technical problem of the present invention is solved by the following technical programs.
This electromagnetic oven synchronization control circuit, comprise current rectifying and wave filtering circuit, resonant circuit, switching device, drive circuit, the input of resonant circuit is connected with the output of current rectifying and wave filtering circuit, one output of resonant circuit is connected with the input of switching device, and the output of drive circuit is connected with the control end of switching device.
The characteristics of this electromagnetic oven synchronization control circuit are: also comprise synchronous signal circuit and MCU control unit, the input of described synchronous signal circuit is connected with an output of resonant circuit, the output of described synchronous signal circuit is connected with an input of MCU control unit, and an input of described drive circuit is connected with an output of MCU control unit; Described synchronous signal circuit is a comparator circuit.
The characteristics of this electromagnetic oven synchronisation control means are may further comprise the steps:
(a): synchronous signal circuit detects the resonance potential of resonant circuit;
(b): after resonance potential reduced the arrival set point, synchronous signal circuit produced the sync break pulse signal;
(c): the MCU control unit detects the sync break pulse signal, and the high level continuity signal of output specific width is given drive circuit, drive circuit control switch break-over of device;
(d): after high level continuity signal finished, switching device ended, and resonant circuit produces a resonance;
(e): repeating step (a);
The high level continuity signal of the MCU control unit output in the described step (c) lags behind the sync break pulse signal and exports.
The beneficial effect that technical scheme of the present invention compared with prior art has is: employing MCU control unit output high level continuity signal is given the conducting of the direct control switch device of drive circuit and is ended, bring into play the stable advantage of MCU operating frequency, improved the accuracy of synchronizing process; Make circuit simple, debugging is convenient, and cost reduces.
Description of drawings
Fig. 1 is existing electromagnetic oven synchronization control circuit figure;
Fig. 2 is the circuit diagram of the specific embodiment of the invention.
Embodiment
A kind of electromagnetic oven synchronization control circuit as shown in Figure 2 comprises current rectifying and wave filtering circuit 1, resonant circuit 2, drive circuit 3, synchronous signal circuit 4, MCU control module and switching device IGBT pipe.
Current rectifying and wave filtering circuit 1 comprises rectifier bridge heap F, inductance L 1 and capacitor C 7.Resonant circuit 2 comprises capacitor C 8 and drum inductance XL.Drive circuit 3 comprises triode Q1, triode Q2, resistance R 12, resistance R 13 and resistance R 14.Synchronous circuit 4 comprises comparator UC1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and resistance R 6.
The course of work of above circuit is: IGBT IN signal of MCU control control unit output, this signal is to have the high level signal of setting width, after drive circuit 3 is accepted this signal, drive the conducting of IGBT pipe, line voltage charges to drum inductance XL by behind the current rectifying and wave filtering circuit.When the IGBTIN signal ended, the IGBT pipe ends, and drum inductance XL charges to capacitor C 8.After capacitor C 8 was charged to the voltage peak, 8 pairs of drum inductance of capacitor C XL discharged, and finishes resonant process one time.When above-mentioned resonant process was in capacitor C 8 discharge and finishes soon, the backward end dividing potential drop of comparator UC1 was greater than the forward end dividing potential drop, and the upset output low level takes place comparator UC1, and this synchronizing signal is input to the interruptive port of MCU control unit as the MCU interrupt signal.MCU interrupt to adopt trailing edge to trigger, detect the trailing edge of synchronizing signal when the MCU control unit after, this interrupt signal of software priority treatment, MCU control unit output IGBT IN signal drives the conducting of IGBT pipe once more.Because the lead of synchronizing signal, so the IGBT IN signal several microseconds of synchronizing signal that are set to lag behind in the MCU control unit with several microseconds.
In the said process, the IGBT IN signal high level of MCU control unit output directly drives the conducting of IGBT pipe through drive circuit 3.The width of IGBT IN signal high level is by the size decision of power.
For guaranteeing the fast reaction of synchronizing process, need in the Control Software structure of MCU control unit, be set to limit priority by the sync break signal, make the MCU control unit in time handle synchronizing signal.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (2)

1. electromagnetic oven synchronization control circuit, comprise current rectifying and wave filtering circuit, resonant circuit, switching device, drive circuit, the input of resonant circuit is connected with the output of current rectifying and wave filtering circuit, one output of resonant circuit is connected with the input of switching device, the output of drive circuit is connected with the control end of switching device, it is characterized in that:
Also comprise synchronous signal circuit and MCU control unit, the input of described synchronous signal circuit is connected with an output of resonant circuit, the output of described synchronous signal circuit is connected with an input of control MCU unit, and an input of described drive circuit is connected with an output of MCU control unit; Described synchronous signal circuit is a comparator circuit.
2. an electromagnetic oven synchronisation control means is characterized in that, may further comprise the steps:
(a): synchronous signal circuit detects the resonance potential of resonant circuit;
(b): after resonance potential reduced the arrival set point, synchronous signal circuit produced the sync break pulse signal;
(c): the MCU control unit detects the sync break pulse signal, and the high level continuity signal of output specific width is given drive circuit, drive circuit control switch break-over of device;
(d): after high level continuity signal finished, switching device ended, and resonant circuit produces a resonance;
(e): repeating step (a);
The high level continuity signal of the MCU control unit output in the described step (c) lags behind the sync break pulse signal and exports.
CNB2007101243104A 2007-10-30 2007-10-30 A kind of electromagnetic oven synchronisation control means and circuit thereof CN100539768C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2007101243104A CN100539768C (en) 2007-10-30 2007-10-30 A kind of electromagnetic oven synchronisation control means and circuit thereof

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Application Number Priority Date Filing Date Title
CNB2007101243104A CN100539768C (en) 2007-10-30 2007-10-30 A kind of electromagnetic oven synchronisation control means and circuit thereof

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CN100539768C true CN100539768C (en) 2009-09-09

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CN101848567B (en) * 2010-03-25 2012-12-12 马国坤 Multichannel electromagnetic oscillation synchronous generating method and circuit thereof
CN102281658A (en) * 2011-07-25 2011-12-14 深圳和而泰智能控制股份有限公司 Synchronous signal acquiring circuit and control device for induction cooker and induction cooker
CN102361524A (en) * 2011-10-14 2012-02-22 刘俊 Method for increasing power of electromagnetic oven and circuit thereof
CN103237375A (en) * 2013-04-07 2013-08-07 广东鼎燊科技有限公司 Synchronous width modulation type induction heating device
CN104540258B (en) * 2014-12-27 2016-01-13 佛山市顺德区海明晖电子有限公司 Commercial formula electromagnetic oven circuit
CN105246182B (en) * 2015-10-23 2018-05-25 深圳市鑫汇科股份有限公司 Electromagnetic induction heater and its multi-resonant circuit
CN105468065B (en) * 2015-11-23 2018-01-19 珠海格力电器股份有限公司 Household electrical appliance back-pressure control method and device and household electrical appliance
CN108419318B (en) * 2017-02-10 2020-12-22 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating device, electromagnetic heating system and control method thereof
CN108966395B (en) * 2017-05-22 2021-03-19 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system, IGBT drive control circuit and fault detection method thereof
CN108966396B (en) * 2017-05-22 2021-03-19 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system, IGBT drive control circuit and fault detection method thereof
CN108934095A (en) * 2017-05-22 2018-12-04 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system, IGBT drive control circuit and its fault detection method
CN108966394B (en) * 2017-05-22 2021-03-19 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system, IGBT drive control circuit and fault detection method thereof
CN109104781A (en) * 2017-06-20 2018-12-28 佛山市顺德区美的电热电器制造有限公司 Electric cooking pot and its heating control apparatus and method
CN107318183B (en) * 2017-06-30 2020-09-08 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven

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CN2842966Y (en) * 2005-09-20 2006-11-29 广州擎天实业有限公司 Electro magnetic rice-cooker controller
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CN2735415Y (en) * 2004-09-27 2005-10-19 广州擎天实业有限公司 Electromagnetic cooker controller
US20070012684A1 (en) * 2005-07-12 2007-01-18 Holtek Semiconductor Inc. Power control apparatus and method for electric cookers
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