CN101309529B - Intelligent control apparatus and method for high-power energy saving electromagnetic stove - Google Patents
Intelligent control apparatus and method for high-power energy saving electromagnetic stove Download PDFInfo
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- CN101309529B CN101309529B CN2008100482032A CN200810048203A CN101309529B CN 101309529 B CN101309529 B CN 101309529B CN 2008100482032 A CN2008100482032 A CN 2008100482032A CN 200810048203 A CN200810048203 A CN 200810048203A CN 101309529 B CN101309529 B CN 101309529B
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Abstract
The invention relates to an intelligent control device of a high power energy saving electromagnetic stove, and the method thereof, The intelligent control device comprises a controllable rectifying and filtering module, a contravariant module and a microcomputer controlling module, which is characterized in that a three-phase alternating current power supply is rectified into an adjustable direct current power supply through the controllable rectifying and filtering module ; the direct current power supply is inverted into a high frequency alternating current power supply through the contravariant module, and then the electric energy is converted into electromagnetic energy to be radiated to the bottom of a cookware, and vortex flow is generated, and the cookware can be heated because of the thermal effect of the vortex flow; the microcomputer controlling module is the core of the entire system, which is used for collecting data and transmitting control information to each module; the device adopts a series of advanced control policies, such as the trigger control of the rectifier bridge of an PI regulator, the intelligent self-adaptive constant power control, the intelligent soft-start control, the intelligent cookware detection control, etc., and thereby the working stability and the security of the electromagnetic stove are enhanced. The harmonic pollution of the equipment to the electric network can be reduced to the utmost extent when the electric energy of the electromagnetic stove is saved, and the electromagnetic stove is suitable for various kitchens and dining rooms.
Description
Technical field
The invention belongs to a kind of control device and control method of electromagnetic stove, particularly, is a kind of intelligence controlling device and method of high-power energy saving electromagnetic stove.
Background technology
Along with the generally raising of people's living standard, environmental protection and energy-conservation notion begin to be rooted in the hearts of the people.Electromagnetic stove is as a kind of cleaning, and is energy-conservation, and cooking apparatus easy to use begins to replace traditional kitchen range top and comes into huge numbers of families.And most of electromagnetic stove of selling on the market at present is low power household electromagnetic cooker, and its power mostly below 2000W, because its power is little, is difficult to satisfy school lunch service, factory, hotel, hotel, office, large scale business center to powerful demand.
Present existing high-power induction cooker all adopts the mode of frequency modulation to regulate power output.In power output hour, its operating frequency is away from the resonance point frequency of resonant circuit, and the reactive power that produces on major loop is big, and the power factor (PF) of electromagnetic stove is low, and energy conversion efficiency is low, has wasted a large amount of electric energy.Bigger reactive power also can produce harmonic pollution to electrical network, and bigger reactive current has increased the heating of high-power electronic devices such as IGBT, has reduced job stability, fail safe and the useful life of IGBT and other electronic devices.Present high-power induction cooker also all adopts fixed shelves to decide the control mode of frequency, and when gear one timing, the operating frequency of electromagnetic stove is just certain.The fixed control mode frequently of fixed shelves can not accurately be controlled the power output of each gear, when the variable in distance of voltage ripple of power network, pan size variation, pan changes in material, pan and heater coil disc, there is very big difference in power output under different situations, can not accurately control the power output of electromagnetic stove, the heating firepower instability of each gear, control precision is poor.In addition, electromagnetic stove is in heating process, and after pan was taken away, having or not of pan often can not in time be judged by system, thereby works on, and under the situation of no pan, caused a large amount of electromagnetic leakages and waste of energy, reduced the conversion efficiency of energy.
Summary of the invention
The object of the present invention is to provide the design of a kind of employing microcomputerized control, have energy-efficiently, the intelligence controlling device and the method for clean environment firendly, high safety, high-power energy saving electromagnetic stove that reliability is high are to overcome above-mentioned deficiency.
For achieving the above object.The present invention is made of controlled rectification filtration module, inversion module and microcomputer controlling module, is characterized in:
Controlled rectification filtration module: be integrated with the AC power input interface,, carry out the full-bridge controlled rectification, pass through output interface after the filtering, for inversion module provides DC power supply through the three phase rectifier trigger control circuit as the energy input of whole device;
Inversion module: by series resonant circuit is the AC power of high frequency with the DC power supply inversion, produce the electromagnetic field of alternation through high-frequency ac energy behind the coil panel L4, after placing pan on the coil panel, electromagnetic field radiation to pan bottom produces eddy current, because the thermal effect of eddy current produces Joule heat, thus the heating pan;
Microcomputer controlling module: link to each other by data wire with other each module, detect DC bus-bar voltage, dc bus current, high-frequency ac current, coil panel L4 temperature, movement temperature and gear input signal in real time, and send control command, by microcontroller chip controls PWM unit output single channel pwm signal, the PWM drive signal that obtains the control of two-way band dead band by hardware dead band control circuit is to drive inversion module.
Above-mentioned controlled rectification filtration module disturbs inhibition capacitor C 1～C3, relay, three-phase controlled rectification bridge, three phase rectifier trigger bridge circuit, synchrotrans, pi regulator 1, differential mode inductance L2～L3, filter capacitor C4, dc voltage detector UT and direct current detector IT1 to constitute by common mode inductance L1, protective tube F1～F3, power supply; The voltage signal that dc voltage detector UT detects is divided into two-way, one tunnel voltage feedback signal U as rectifier control circuit
b, another road signal U
dBe connected to the signal conditioning circuit of microcomputer controlling module with the output of direct current detector IT1, together as the feedback signal of the permanent power control of intelligent adaptive.
Above-mentioned inversion module is made of high-power switch tube IGBT1～IGBT2, IGBT isolated drive circuit, resonant capacitance C5～C6, alternating current detector IT2 and coil panel L4; The IGBT drive signal is provided by the pwm signal of the band two-way dead band control that produces through hardware dead band control circuit, through the work of IGBT driver module rear drive power switch pipe; Be serially connected with alternating current detector IT2 on the resonance major loop, the output of IT2 is connected to the signal conditioning circuit of microcomputer controlling module, delivers to microcontroller (MCU) then, detects control and overcurrent protection signal as pan.
Above-mentioned microcomputer controlling module comprises that gear input circuit, cooling fan relay drive circuit, three phase mains relay drive circuit, microcontroller (MCU), power module, signal conditioning circuit, hardware dead band control circuit, safety protective circuit, charactron display circuit, sound light alarming circuit and communication interface circuit constitute; External power source provides power supply through each circuit for microcomputer controlling module behind the power module; Fan and three phase mains relay drive circuit are by the I/O mouth control of MCU, and the output of drive circuit links to each other with the relay group; Signals such as dc voltage detector UT, direct current detector IT1, alternating current detector IT2, Temperature Detector TT1～TT2 and gear input circuit are through flowing to the A/D sampling unit of MCU behind the signal conditioning circuit; The gear input circuit adopts the mode of resistance series connection dividing potential drop, and the corresponding voltage of each gear is through sending the A/D sampling unit of MCU behind voltage follow and the isolating amplifier circuit to, as the given signal of the corresponding power of different gears; The charactron display circuit shows the current work gear of electromagnetic stove, nonserviceables to show failure code down.
Above-mentioned hardware dead band control circuit is made up of logical circuit and resistance, electric capacity, and the input of hardware dead band control circuit links to each other with the PWM unit output pin of microcontroller (MCU); Hardware dead band control circuit at first is divided into the single channel pwm signal signal of two-way complementation by inverter, when signal uprises level by low level, by resistance electric capacity is charged, the time is delayed when making pwm signal uprise level by low level, signal is during by high level step-down level, electric capacity is not delayed time when making pwm signal by high level step-down level by the backward diode repid discharge, thereby obtains the pwm signal of two-way band dead band complementation.
Above-mentioned microcomputer controlling module is integrated with communication interface unit, adopts the RS-485 bus communication protocol, realizes telecommunication; Microcomputer controlling module can connect liquid-crystal controller or through connecting PC behind the RS-485 commentaries on classics RS-232, provide the operating state and the fault message of electromagnetic stove in real time by the RS-485 bus, realizes remote online monitoring and failure diagnosis.
The present invention also provides a kind of high-power energy saving electromagnetic stove intelligence control method, its control device is made of controlled rectification filtration module, inversion module and microcomputer controlling module, its control method is: adopt adaptive constant-power control method, the output voltage by regulating rectifier bridge and the operating frequency of fine setting inversion module reach the purpose of the permanent power output of regulating each gear, wherein:
The controlled rectification filtration module carries out filtering with three-phase alternating-current supply earlier, adopts based on the three phase rectifier triggering control of pi regulator again and carries out full-bridge rectification, obtains stablizing level and smooth direct voltage once more after the filtering, and this voltage is as the input voltage of inversion module;
Inversion module adopts pulse frequency modulated (PFM) method, is AC power by series resonant circuit with the DC power supply inversion, its operating frequency is a little more than the resonance frequency of resonant circuit, control by microcomputer controlling module, make load be perception, ac inverter makes electric energy convert electromagnetic energy to by coil panel L4, and electromagnetic field radiation to pan bottom produces eddy current, because the thermal effect of eddy current produces Joule heat, thus the heating pan;
Microcomputer controlling module detects DC bus-bar voltage, dc bus current, high-frequency ac current, coil panel temperature, movement temperature and gear input signal in real time, after handling as calculated, by microcontroller chip controls PWM unit output single channel pwm signal, the PWM drive signal that obtains the control of two-way band dead band by the hardware dead-zone circuit is to drive inversion module.
Above-mentioned adaptive constant-power control method comprises two parts: when regulating in more high-power scope, adopt and regulate the output of rectifier bridge output voltage adjusting power; When power is regulated, behind the rectifier bridge output voltage stabilization, adopt the mode of frequency modulation Power Regulation in more among a small circle, the operating frequency of fine setting inversion module IGBT, what make the power output intelligent adaptive follows the given power of gear, accurately controls the heating firepower of each gear.
Above-mentioned controllable rectifier module adopts the three-phase commutation bridge of pi regulator to trigger control, provides the given signal U of three-phase commutation bridge output voltage from the gear input circuit
I, given signal U
IFeedback voltage signal U with the dc voltage detector detection
bCompare, obtain voltage deviation Δ U,, regulate the phase shift controlling voltage U of rectification triggering circuit by pi regulator 1
CSize changes the trigger angle of three-phase commutation bridge thyristor, thereby adjusts the output voltage of three-phase controlled rectification bridge, changes the power output of electromagnetic stove.
Above-mentioned electromagnetic stove adopts soft-start method; rectifier and trigger control circuit and constant-power control circuit all adopt the control method of regulating based on PI; when starting up and gear shift; the voltage of rectifier bridge output slowly changes and the power of electromagnetic stove output slowly changes; suppress the sudden change of electric current in the main circuit; accomplish the soft start of high power device, the safety of protection high power device.
Above-mentioned electromagnetic stove adopts the pan of low-power consumption to detect control method, electromagnetic stove is under inspection pot state, adopt intermittent duty to send inspection pot pulse signal, sending stopping period, forbid power switch pipe IGBT work, and, make the upper and lower brachium pontis of IGBT module be in off state simultaneously by microcontroller chip output PWM locking signal.
Because the present invention adopts the mode of controlled rectification to carry out power adjustments output, obviously be different from the control mode of other electromagnetic stove frequency modulation Power Regulation, reactive current is little on the feasible control major loop, reactive power is little, the power factor (PF) height, significantly saved electric energy, also reduced the harmonic pollution of reactive power simultaneously electrical network; The rectifier bridge based on pi regulator that adopts triggers two control of permanent power of control and intelligent adaptive and regulates strategy, has guaranteed that accurately reaching of each gear heating firepower is stable; The fail safe that the intelligent soft starter control technology that adopts has improved circuit; The intelligent pan detection technique that adopts has reduced electromagnetic radiation and electromagnetic pollution, and saves energy; The hardware dead-zone circuit that adopts has strengthened the security and stability of electromagnetic stove work.The present invention has broken through the restriction of traditional electromagnetic stove power output, makes the power output of two-tube semibridge system electromagnetic stove expand to 6000-10000 watt.This electromagnetic stove firepower control is accurate, stable, load circuit power factor (PF) height, and significantly saves energy can make equipment that the harmonic pollution of electrical network is reduced to minimum simultaneously, is fit to various kitchen and dining rooms and uses.
Description of drawings
In order further to understand the present invention, the accompanying drawing of a book part has been indicated embodiments of the invention as an illustration, and the explanation of being done is used to explain principle of the present invention.
Fig. 1 is an overall structure theory diagram of the present invention.
Fig. 2 is hardware of the present invention dead band control circuit figure.
Fig. 3 is the permanent power control principle block diagram of pi regulator rectifier and trigger control of the present invention with intelligent adaptive.
Embodiment
The invention will be further described below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.
Main part of the present invention is formed (as shown in Figure 1) by controlled rectification filtration module (AC-DC module), inversion module (DC-AC module) and microcomputer controlling module (Micro-computer controlmodule) parts; The controlled rectification filtration module is rectified into adjustable direct voltage with three-phase alternating current, pass through inversion module then, convert direct current to high-frequency alternating current, convert electric energy to electromagnetic energy by coil panel L4 and be radiated to the bottom of a pan generation eddy current, because the thermal effect of eddy current is with the heating pan, microcomputer controlling module is the core of whole system, is used for image data and sends control information to each module.
The controlled rectification filtration module is by common mode inductance L1, power supply disturbs and suppresses capacitor C 1, C2, C3, relay, the three-phase controlled rectification bridge, the three phase rectifier trigger bridge circuit, synchrotrans, pi regulator 1, differential mode inductance L2 and L3, dc filter capacitor C4, dc voltage detector UT and direct current detector IT1 form, outside three phase mains is connected to three-phase common mode inductance L1 and capacitor C 1, C2, C3 forms middle line filter, to importing the three phase mains filtering of this device, remove High-frequency Interference, the output of filter links to each other with relay, the output of relay is connected to the three-phase controlled rectification bridge, and be parallel with synchrotrans, export three road synchronizing voltage U
SA, U
SB, U
SCBe connected to the synchronizing voltage input of rectification triggering circuit, start pulse signal is controlled the rectifier bridge thyristor, makes the direct voltage of three-phase controlled rectification bridge output ripple, adopt differential mode inductance L2, L3 and capacitor C 4 filtering after the rectification, make system's output stablize level and smooth direct voltage U
DC, under rated voltage, its output average voltage U
DC=2.34*220cos α, α are trigger angle.Pi regulator 1 is exported phase shift controlling voltage U according to the deviation of given voltage and feedback voltage
C, phase shift controlling voltage is connected to the phase-shifting voltages input of rectifier bridge circuits for triggering module, and the trigger angle α of control trigger impulse presses rectifier bridge output controlled amount and galvanic current.On the dc bus after current rectifying and wave filtering circuit, be connected with dc voltage detector UT and direct current detection IT1, the signal that UT detects is divided into two-way, one the tunnel as voltage feedback signal, with given voltage ratio after, through pi regulator 1 output phase shift controlling voltage, the triggering control signal of phase shift controlling voltage control rectification triggering circuit module output, the output of another road and direct current detector IT1 is connected to the signal conditioning circuit of microcomputer controlling module, link to each other with the AD sampling unit of MCU then, the signal that IT1 and UT detect is as the feedback signal of the permanent power control of intelligent adaptive.
Inversion module is made of isolated drive circuit, coil panel L4, resonant capacitance C5, C6, high-frequency alternating current current sensor IT2 and the pan of half-bridge high-power switch tube IGBT module, IGBT.The isolated drive circuit of IGBT links to each other with the hardware dead band control circuit of microcomputer controlling module, by microcomputer controlling module output driving frequency, the isolated drive circuit of IGBT drives the work of half-bridge IGBT module, stablizes level and smooth direct voltage U with what current rectifying and wave filtering circuit obtained
DCBe reverse into the alternating current of high frequency.The operating frequency of inverter circuit is a little more than the resonance frequency of resonant circuit, and load circuit approaches pure resistive, and reactive power is little, and the power factor (PF) height is little to the harmonic pollution of electrical network, saves energy.Coil panel L4 and resonance capacitor C 5, C6 is connected in series, its resonance point frequency is a little less than the low-limit frequency of power switch pipe work, make to load on and be perception under any operating mode, under the alternating voltage of the high frequency that inverter circuit produces drives, the alternating current that high frequency is arranged on the coil panel L4, the alternating current of high frequency produces the electromagnetic field of alternation, according to inductive heating principle, after coil panel L4 went up and places pan, the bottom of pan produced eddy current heat, convert electric energy to heat energy heating pan, eddy current heat directly acts on the pan bottom, and thermal losses is little, heat efficiency height, effectively improve energy utilization ratio, saves energy.Be connected with high-frequency ac detector IT2 on the resonant circuit major loop, the output of IT2 is connected to the signal conditioning circuit of microcomputer controlling module, delivers to MCU then, detects control, overcurrent protection Control and Feedback to microcomputer controlling module as pan.
Microcomputer controlling module is made of microcontroller MCU, power module, relay drive circuit, hardware dead band control circuit, signal conditioning circuit, gear input circuit, display circuit and communication interface circuit.External power source provides power supply through each circuit for microcomputer controlling module behind the power module.Relay drive circuit is by the I/O mouth control of MCU, and the output of relay drive circuit links to each other with the relay group, control three phase mains relay and radiator fan relay.Dc voltage detector UT, direct current detector IT1, alternating current detector IT2, gear input circuit, Temperature Detector TT1, TT2 are that digital signal is carried out computing through flowing to the A/D sampling unit of MCU behind the signal conditioning circuit with analog signal conversion.The input of hardware dead band control circuit links to each other with the PWM unit output pin of MCU, and the drive signal of hardware dead band control circuit output two-way complementation links to each other power controlling switching tube IGBT operating frequency with the isolated drive circuit of IGBT.The gear input circuit links to each other with the A/D sampling module of MCU behind signal conditioning circuit, import the given power signal of each gear to MCU, MCU is according to detected direct voltage and direct current, the operating frequency of fine setting electromagnetic stove, make power output always follow power given, adaptive permanent power is controlled the heating power of each gear, accurately controls the heating firepower of each gear.The charactron display circuit links to each other with the SPI mouth of MCU, adopt serial mode to transmit data and show that to charactron charactron shows current work gear, nonserviceabling shows failure code down, indicator light circuit links to each other with the I/O mouth of MCU, the various operating states of indication electromagnetic stove.Communication interface adopts the RS-485 bus, realizes the real time on-line monitoring of host computer, convenient debugging and maintenance.
The input of hardware dead band control circuit (as shown in Figure 2) links to each other with the PWM output pin of MCU, the MCU output duty cycle is 1/2 pwm signal, this pwm signal at first is divided into the opposite signal of two-way by inverter, then each road signal is delayed time to high level by low level.When each road signal uprises level by low level; by resistance R ES1 (another road is RES2) capacitor C AP1 (another road is CAP2) is charged; the time is delayed when making pwm signal uprise level by low level; signal is during by high level step-down level; capacitor C AP1 (another road is CAP2) is by backward diode DIODE1 (another road is DIODE2) repid discharge; do not delayed time when making pwm signal by high level step-down level; thereby obtain the pwm signal of two-way band dead band complementation; the length of Dead Time is calculated by the threshold level of the high level input of the zero state response of firstorder circuit and AND circuit; the pwm signal and the overcurrent of the dead band complementation of two-way band; the overvoltage protection signal; the PWM locking signal of the I/O of MCU output with after give IGBT the isolation drive module, drive IGBT and work.
In an embodiment of the present invention, adaptive constant-power control method comprises two parts, when regulating in more high-power scope, adopts the rectifier and trigger control based on pi regulator, the power output of coarse adjustment electromagnetic stove; When power is regulated in more among a small circle, behind the rectifier bridge output voltage stabilization, employing is based on the mode of the frequency modulation Power Regulation of pi regulator, the operating frequency of fine setting inversion module IGBT, what make the power output intelligent adaptive follows the given power of gear, accurately controls the heating firepower (as shown in Figure 3) of each gear.Rectification triggering circuit control strategy based on pi regulator is: pi regulator 1 is exported phase shift controlling voltage U according to the deviation of given voltage and feedback voltage
C, phase shift controlling voltage is connected to the phase-shifting voltages input of rectifier bridge circuits for triggering module, and the trigger angle of control trigger impulse is pressed rectifier bridge output controlled amount and galvanic current, thereby adjusts the power output of electromagnetic stove.Simultaneously, when line voltage raises or reduce, the voltage of rectifier bridge output raises or reduces, and feedback voltage also increases or reduces, with given voltage ratio after, deviation voltage is non-vanishing, thereby change the phase shift controlling voltage of pi regulator 1 output, adjust the trigger angle of rectifier bridge thyristor, change the output voltage of rectifier bridge, make the output voltage of rectifier bridge follow given voltage, effectively suppress the influence of voltage ripple of power network power output.
After dc voltage stability is constant, adopt accurate voltage and current double closed-loop control based on pi regulator, the power output of fine setting electromagnetic stove makes power output follow given power.It is embodied as: from gear input circuit input service gear, import given power P to MCU
ISignal, MCU detects voltage, the size of current of returning according to dc voltage detector UT and direct current detector IT1, calculates actual power output P
O, given power P
IPower output P with reality
ORelatively, obtain power deviation Δ P, pass through the pi regulator 2 of amplitude limit then, PWM unit among the MCU is given in the output of pi regulator 2, the output frequency of fine setting PWM waveform, the purpose of pi regulator 2 amplitude limits is that the low-limit frequency of guaranteeing the output of PWM unit is higher than the resonance dot frequency, makes load be perception.PWM unit output single channel pwm signal links to each other with external hardware dead band control circuit, form the complementary drive signal in two-way band dead band, the complementary drive signal in this two-way band dead band is connected to the driver module of IGBT through isolation, the drive signal of the driver module output of IGBT links to each other with the grid emitter-base bandgap grading of half-bridge IGBT module, drive the work of half-bridge IGBT module, adjust power output, make power output follow given power.The pan material, size, the distance of coil panel L4 and pan is the key factor that differs greatly that influences power output, in installation process, coil panel L4 exists alignment error to cause power output there are differences, the variation of the variation of pan material and pan size also can cause power output to change, the heating firepower there are differences, under the situation of rectifier bridge output voltage stabilization, employing is based on the accurate voltage and current double closed-loop control of pi regulator, the operating frequency of fine setting electromagnetic stove, make power output always follow given power, power deviation and pan size that alignment error causes have effectively been eliminated, the power deviation that changes in material causes, make power output always follow given power, accurately the firepower of control heating.
In an embodiment of the present invention, adopt the intelligent soft starter technology of regulating, suppress chugging, accomplish the soft start of high power device, the safety of protection high power device based on PI.In control structure figure shown in Figure 3, set the proportionality constant of pi regulator 1 less, integration time constant is set greatlyyer, therefore, when starting up and gear switch, less because of proportionality constant, integration time constant is bigger, the integral action of the existence of deviation and pi regulator 1 makes the output phase shift controlling voltage U of pi regulator 1
CChange slowly; the trigger angle of rectification triggering circuit module output slowly changes; thereby the voltage of rectifier bridge output slowly changes; power output can not increase or reduce moment; electric current can not suddenly change; can not cause because the high voltage transient that current break produces damages high power device the safe and reliable operation of protection high-power electronic device.Simultaneously; give microcomputer controlling module with the signal that high-frequency current detector IT2 on the resonant tank detects; through comparing with current comparator behind the signal conditioning circuit; when overcurrent occurring; comparator output overcurrent signal is given hardware dead band control circuit; block drive signal, the high power device overcurrent is protected fast, guarantee the device work safety.
Electromagnetic stove continues to drive IGBT work and then has part magnetic field and leak under no pan situation, and wastes a large amount of electric energy.For reducing electromagnetic leakage and electromagnetic pollution and saves energy, in an embodiment of the present invention, adopted the intelligent pan measuring ability of low-power consumption.The MCU control intermittent output in PWM unit PWM drive signal, the every interval 2s of MCU just sends the PWM drive signal of 50ms, and in At All Other Times, the PWM unit of MCU inside quits work, simultaneously, MCU output locking signal is given hardware dead band control circuit, blocks the complementary drive signal in two-way band dead band simultaneously, makes the upper and lower bridge arm of switching tube be in off state simultaneously.During transmission frequency, detect major loop high-frequency current detector IT2 and go up direct current detector IT1 size of current on size of current and the dc bus, judge whether pot is arranged on the electromagnetic stove, when electric current during greater than a certain set point, the proof pan exists, and electromagnetic stove enters normal power output pan is heated, and when electric current during less than this set point, then being judged as does not have pot, and buzzer provides short cry and the indicator light flash for prompting does not have pot.In normal heating process, after pan is removed, the electric current that direct current detector detects reduces rapidly, when electric current during less than a certain set point, then being judged as does not have pot, enter an inspection pot mode detection pan, has effectively suppressed electromagnetic stove and has not had a large amount of electromagnetic leakages and the electromagnetic pollution that driving frequency that MCU under the pot situation continues output IGBT causes, save electric energy, improved efficient.
Should illustrate that at last enforcement of the present invention only is used to technical scheme is described and is unrestricted.The content that is not described in detail in the specification of the present invention belongs to this professional domain technical staff known prior art.
Claims (9)
1. high-power energy saving electromagnetic stove intelligence controlling device, it comprises controlled rectification filtration module, inversion module and microcomputer controlling module, it is characterized in that:
The controlled rectification filtration module is integrated with the AC power input interface, as the energy input of whole device, carries out the full-bridge controlled rectification through the three phase rectifier trigger control circuit, passes through output interface after the filtering, for inversion module provides DC power supply; Inversion module is the AC power of high frequency by series resonant circuit with the DC power supply inversion, through producing the electromagnetic field of alternation behind the coil panel L4, is radiated to the pan bottom and produces eddy current, utilizes the thermal effect of eddy current to heat pan; Each module of microcomputer controlling module and other links to each other by data wire, detect DC bus-bar voltage in real time, dc bus current, high-frequency ac current, coil panel L4 temperature, movement temperature and gear input signal, and send control command, by microcontroller chip controls PWM unit output single channel pwm signal, the PWM drive signal that obtains the control of two-way band dead band by hardware dead band control circuit is to drive inversion module, wherein: hardware dead band control circuit is by logical circuit and resistance, electric capacity is formed, and the input of hardware dead band control circuit links to each other with the PWM unit output pin of microcontroller (MCU); Hardware dead band control circuit at first is divided into the single channel pwm signal signal of two-way complementation by inverter, when signal uprises level by low level, by resistance electric capacity is charged, the time is delayed when making pwm signal uprise level by low level, signal is during by high level step-down level, electric capacity is not delayed time when making pwm signal by high level step-down level by the backward diode repid discharge, thereby obtains the PWM drive signal of two-way band dead band complementation.
2. a kind of high-power energy saving electromagnetic stove intelligence controlling device as claimed in claim 1, it is characterized in that: the controlled rectification filtration module is by A, B, C input three-phase alternating voltage is through common mode inductance L1, protective tube F1～F3, power supply disturbs and suppresses capacitor C 1～C3, relay, the three-phase controlled rectification bridge, the three phase rectifier trigger bridge circuit, synchrotrans, pi regulator (1), differential mode inductance L2～L3, filter capacitor C4, dc voltage detector UT and direct current detector IT1 constitute, the voltage signal that dc voltage detector UT detects is divided into two-way, one tunnel voltage feedback signal U as rectifier control circuit
b, another road signal U
dBe connected to the signal conditioning circuit of microcomputer controlling module with the output of direct current detector IT1, together as the feedback signal of self-adaption constant power control.
3. a kind of high-power energy saving electromagnetic stove intelligence controlling device as claimed in claim 1 is characterized in that: inversion module is made of high-power switch tube, isolated drive circuit, resonant capacitance C5～C6, alternating current detector IT2 and coil panel L4; The isolated drive circuit drive signal is provided by the PWM drive signal of the band two-way dead band control that produces through hardware dead band control circuit, through the work of isolated drive circuit driver module rear drive power switch pipe; Be serially connected with alternating current detector IT2 on the resonance major loop, the output of IT2 is connected to the signal conditioning circuit of microcomputer controlling module, delivers to microcontroller (MCU) then, detects control and overcurrent protection signal as pan.
4. a kind of high-power energy saving electromagnetic stove intelligence controlling device as claimed in claim 1 is characterized in that: microcomputer controlling module is made of gear input circuit, cooling fan relay drive circuit, three phase mains relay drive circuit, microcontroller (MCU), power module, signal conditioning circuit, hardware dead band control circuit, safety protective circuit, charactron display circuit, sound light alarming circuit and communication interface circuit; External power source provides power supply through each circuit for microcomputer controlling module behind the power module; Fan and three phase mains relay drive circuit are by the I/O mouth control of microcontroller (MCU), and the output of drive circuit links to each other with the relay group; Dc voltage detector UT, direct current detector IT1, alternating current detector IT2, Temperature Detector TT1～TT2 and gear input circuit signal are through inputing to the A/D sampling unit of microcontroller (MCU) behind the signal conditioning circuit; The gear input circuit adopts the mode of resistance series connection dividing potential drop, and the corresponding voltage of each gear is through sending the A/D sampling unit of microcontroller (MCU) to behind voltage follow and the isolating amplifier circuit; The charactron display circuit shows the current work gear of electromagnetic stove, nonserviceables to show failure code down; Module is integrated with communication interface unit, adopts the RS-485 bus communication protocol, realizes remote online monitoring and failure diagnosis.
5. high-power energy saving electromagnetic stove intelligence control method, its control device is by controlled rectification filtration module, inversion module and microcomputer controlling module, its control method is: adopt adaptive constant-power control method, the output voltage by regulating rectifier bridge and the operating frequency of fine setting inversion module reach the purpose of the permanent power output of regulating each gear, wherein:
The controlled rectification filtration module carries out filtering with three-phase alternating-current supply earlier, adopts based on the three phase rectifier triggering control of pi regulator again and carries out full-bridge rectification, obtains stablizing level and smooth direct voltage once more after the filtering, and this voltage is as the input voltage of inversion module;
Inversion module adopts pulse frequency modulated (PFM) method, is AC power by series resonant circuit with the DC power supply inversion, its operating frequency is a little more than the resonance frequency of resonant circuit, control by microcomputer controlling module, make load be perception, ac inverter makes electric energy convert electromagnetic energy to by coil panel L4, and electromagnetic field radiation to pan bottom produces eddy current, because the thermal effect of eddy current produces Joule heat, thus the heating pan;
Microcomputer controlling module detects DC bus-bar voltage, dc bus current, high-frequency ac current, coil panel L4 temperature, movement temperature and gear input signal in real time, after handling as calculated, by microcontroller chip controls PWM unit output single channel pwm signal, the PWM drive signal that obtains the control of two-way band dead band by the hardware dead-zone circuit is to drive inversion module, wherein: hardware dead band control circuit is made up of logical circuit and resistance, electric capacity, and the input of hardware dead band control circuit links to each other with the PWM unit output pin of microcontroller (MCU); Hardware dead band control circuit at first is divided into the single channel pwm signal signal of two-way complementation by inverter, when signal uprises level by low level, by resistance electric capacity is charged, the time is delayed when making pwm signal uprise level by low level, signal is during by high level step-down level, electric capacity is not delayed time when making pwm signal by high level step-down level by the backward diode repid discharge, thereby obtains the PWM drive signal of two-way band dead band complementation.
6. a kind of high-power energy saving electromagnetic stove intelligence control method as claimed in claim 5 is characterized in that: adaptive constant-power control method comprises two parts: when regulating in more high-power scope, adopt and regulate the output of rectifier bridge output voltage adjusting power; When power is regulated in more among a small circle, behind the rectifier bridge output voltage stabilization, adopt the mode of frequency modulation Power Regulation, the operating frequency of isolated drive circuit in the fine setting inversion module, what make the power output intelligent adaptive follows the given power of gear, accurately controls the heating firepower of each gear.
7. a kind of high-power energy saving electromagnetic stove intelligence control method as claimed in claim 5 is characterized in that: controllable rectifier module adopts the three-phase commutation bridge of pi regulator to trigger control, provides the given signal U of three-phase commutation bridge output voltage from the gear input circuit
I, U
IFeedback voltage signal U with the dc voltage detector detection
bCompare, obtain voltage deviation Δ U,, regulate the phase shift controlling voltage U of rectification triggering circuit by pi regulator (1)
CSize changes the trigger angle of three-phase commutation bridge thyristor, thereby adjusts the output voltage of three-phase controlled rectification bridge, changes the power output of electromagnetic stove.
8. a kind of high-power energy saving electromagnetic stove intelligence control method as claimed in claim 5; it is characterized in that: adopt soft-start method: the control strategy of regulating based on PI is all adopted in rectifier and trigger control circuit and the control of permanent power; when starting up and gear shift; the voltage of rectifier bridge output slowly changes and the power of electromagnetic stove output slowly changes; suppress the sudden change of electric current in the main circuit; accomplish the soft start of high power device, the safety of protection high power device.
9. a kind of high-power energy saving electromagnetic stove intelligence control method as claimed in claim 5, it is characterized in that: adopt the pan of low-power consumption to detect control method, electromagnetic stove is under inspection pot state, adopt intermittent duty to send inspection pot pulse signal, sending stopping period, forbid the power switch pipe work in the inversion module, and, make the upper and lower brachium pontis of isolated drive circuit module be in off state simultaneously by microcontroller chip output PWM locking signal.
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| CN2008100482032A CN101309529B (en) | 2008-06-27 | 2008-06-27 | Intelligent control apparatus and method for high-power energy saving electromagnetic stove |
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