CN102244949B - Method for controlling electromagnetic heating power - Google Patents
Method for controlling electromagnetic heating power Download PDFInfo
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- CN102244949B CN102244949B CN 201110162232 CN201110162232A CN102244949B CN 102244949 B CN102244949 B CN 102244949B CN 201110162232 CN201110162232 CN 201110162232 CN 201110162232 A CN201110162232 A CN 201110162232A CN 102244949 B CN102244949 B CN 102244949B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 45
- 230000009897 systematic effect Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000026676 system process Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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Abstract
The invention discloses a method for controlling electromagnetic heating power. The method comprises a step of pre-setting parameters and a step of controlling power adjusting. The step of controlling the power adjusting comprises an initial stage and a power adjusting stage. In the initial stage, an IGBT (Insulated Gate Bipolar Translator) works according to an initial service time counter value till a system samples for the first time according to a sampling period T. In the power adjusting stage, according to the pre-set parameters and real-time sampled data, the system calculates a new service time counter value of the IGBT before sampling next time, works according to the calculated new service time counter value of the IGBT till the system samples next time according to the sampling period T, repetitively samples, and calculates the adjusted service time counter value of the IGBT till the end. The method for controlling the electromagnetic heating power disclosed by the invention has the advantages of small occupation space, rapid response and accuracy and stability for control.
Description
Technical field
The present invention designs a kind of control method of electromagnetic heating power, is applicable to the product such as electric cooker, electromagnetic oven of Electromagnetic Heating.
Background technology
The method that the constant control of present electromagnetic heating power is mainly taked is: line voltage is carried out classification, according to the line voltage grade that detects input, table look-up and obtain corresponding rated current parameter, adjust IGBT service time Counter Value, guarantee that the current value of output reaches the current parameters of the software set of tabling look-up.Simultaneously, in the constant process of Modulating Power, according to output current value and the difference between the software set target current value of tabling look-up, determine the amplitude that IGBT service time Counter Value increases progressively, successively decreases.
The weak point of this control method is: current data is tabled look-up and need to be taken more software memory space, and software flow is realized complicated, and simultaneously, the control procedure reaction is slow, output of products power consistency and less stable.
Summary of the invention
The invention reside in for above-mentioned deficiency, provide a kind of realize simple, take up room little, reaction fast, the stable electromagnetic heating power control method of precise control.The main goal of the invention of the present invention is when the conversion heating power, can fast and stablize, and shortens the concussion phase, reduces power fluctuation.
Implementation of the present invention is as follows: a kind of control method of electromagnetic heating power may further comprise the steps:
Step 1, parameter are preset: set initial value Icon_0, the proportional control factor Pcon_G of the initial value Pcon_0, the integral control amount Icon that heat target power Pd, systematic sampling cycle T, proportional control amount Pcon and the parameter of integral control coefficient Icon_G;
Step 2, carry out power adjustments control, comprise starting stage and power adjustments stage, in the starting stage, IGBT carries out work with initial service time Counter Value Pulse_0, until system samples first by sampling period T, Pulse_0=Pcon_0+Icon_0 wherein; In the power adjustments stage, system is according to electric current I _ n, the voltage U _ n of setup parameter and real-time sampling, the service time Counter Value Pulse_n of calculating IGBT before next time sampling, and carry out work with the new IGBT service time Counter Value Pulse_n that calculates, until system samples by sampling period T next time, repeat to sample, calculate the IGBT service time Counter Value after the adjustment, until finish.
In the above-mentioned power adjustments stage, the IGBT service time Counter Value Pulse_n of system-computed before next time sampling may further comprise the steps: real-time sampling electric current I _ n, voltage U _ n, calculate real-time power output P_n:P_n=U_n * I_n; Calculate the difference E:E=Pd-P_n of real-time power output P_n and target power Pd; Calculate front new proportional control amount Pcon_n value and the integral control amount Icon_n value of next time sampling: Pcon_n=E/Pcon_G, Icon_n=Icon_(n-1)+E/Icon_G, wherein Icon_(n-1) be the integral control amount before the sampling; Calculate front new IGBT service time Counter Value Pulse_n value: the Pulse_n=Pcon_n+Icon_n of next time sampling.
The above-mentioned power adjustments stage also comprises the auto-compensation of systematic error, system processes in the E/Icon_G process, remainder is preserved in real time, and add up, adjust in the adjustment process of IGBT service time Counter Value Pulse_n=Pcon_n+Icon_n at each, automatically confirm the accumulated value of E/Icon_G remainder and the relation of Icon_G, if accumulated value more than or equal to Icon_G, then adds up 1 to the parameter of Icon_n; If accumulated value then successively decreases 1 to the parameter of Icon_n less than or equal to-Icon_G.
The above-mentioned power adjustments stage also comprises the voltage jump processing, when operating voltage U increases suddenly 3～20 AD values of amplitude of setting, Icon_n is directly reduced 3～60.
Compared to existing technology, the control method of electromagnetic heating power of the present invention, that control software takes up room is little, reaction fast, and precise control is stable, realizes simple.
Description of drawings
Fig. 1 is that the present invention does not carry out the power control curve under the error correction;
Fig. 2 is the power control curve after the present invention carries out error correction.
Embodiment
In one embodiment of the invention, the control method of electromagnetic heating power may further comprise the steps:
One, set initial parameter:
1, the target power Pd of default heating process control.In the heating process, power P=voltage U * electric current I, control system can be passed through voltage sampling circuit, current sampling circuit, automatically the AD value of Gather and input voltage and the AD value of output services electric current.Be 220V such as rated operational voltage, this moment voltage sampling circuit to gather the AD value of voltage U be 0A5H; When reaching rated power 1250W, current sampling circuit gathers the corresponding 7CH of AD value of electric current I, at this moment power P=U * I=0A5H * 7CH=5000H.The AD value of goal-selling power P d is in the present embodiment: Pd=5000H;
2, predetermined system sampling period T: the length of systematic sampling cycle T can affect the stability of power control, if the sampling period is too short, it is too frequent adjustment to occur, and cycle of oscillation is long; If the sampling period is oversize, it is untimely to occur sampling, and causes oscillation amplitude large.The T value is: T=20ms the predetermined system sampling period in the present embodiment.
3, the safe range of default IGBT service time: the service time of IGBT (pwm value) in safe range, the adjustment accuracy of guarantee power.Represent the service time of IGBT in the present embodiment with the corresponding register counts of IGBT service time Counter Value Pulse, Pulse is larger for the register counts, and IGBT service time is longer.Identical IGBT service time, different products, the Pulse value is not identical yet, can obtain according to the detection to product corresponding Pulse value.Rated power is 1250W in the present embodiment, and when magnitude of voltage was safe minimum 200V, the maximum safety value that records IGBT service time Counter Value was Pulse_max=196; When magnitude of voltage was safe peak 275V, the minimum guard value that records IGBT service time Counter Value was Pulse_min=110.In power adjustment procedure, when the calculating parameter of real-time working IGBT service time Counter Value Pulse_n during greater than Pulse_max, the Pulse_n setting parameter is Pulse_max in real time; When the calculating parameter of real-time working IGBT service time Counter Value Pulse_n during less than Pulse_ min, the Pulse_n setting parameter is Pulse_min in real time.
4, the initial value Icon_0 of the initial value Pcon_0 of preset ratio controlled quentity controlled variable Pcon, integral control amount Icon:
Pcon_0＝?0；Icon_0＝?Pulse_min＝?110。
5, preset ratio control coefrficient Pcon_G, integral control coefficient Icon_G: system is in the actual power adjustment process, suitable proportional control factor Pcon_G can guarantee that the speed of system power adjustment reaches requirement substantially, suitable integral control coefficient Icon_G can guarantee the reaction speed of system power adjustment and the stability of the number of oscillation and power output, be used for the value of real-time resize ratio controlled quentity controlled variable Pcon and integral control amount Icon, different products, have different optimum Pcon_G value and Icon_G value, can draw by test adjustment repeatedly.Pcon_G=200 in the present embodiment, Icon_G=1600.
Two, power adjustments control:
1, starting stage: IGBT carries out work with initial service time Counter Value Pulse_0, until system is by sampling period T(20ms) sample first Pulse_0=Pcon_0+Icon_0=0+Pulse_min=0+110=110 wherein.Corresponding power is shown in curve between Fig. 1, Fig. 2 mid point a, the some b.
2, the power adjustments stage:
1) instantaneous value I_n and the U_n of systematic sampling electric current I, voltage U calculate real-time power output P_n value: P_n=U_n * I_n; Wherein n represents the number of times of sampling;
2) the difference E:E=Pd-P_n of more real-time power output P_n and target power Pd;
3) calculate sample front new proportional control amount Pcon_n value and new integral control amount Icon_n value next time:
Pcon_n＝E?/?Pcon_G，Icon_n＝Icon_(n-1)+E?/?Icon_G；
Wherein Icon_ (n-1) was the integral control amount in the upper sampling period;
4) calculate front new IGBT service time Counter Value Pulse_n value: the Pulse_n=Pcon_n+Icon_n of next time sampling, and carry out work with new Pulse_n value, until system is by sampling period T(20ms) carry out next time sampling, repeat to sample, calculate the IGBT service time Counter Value after the adjustment, until finish.
The below with shown in Fig. 1, Fig. 2 for the first time sampled point b data (P_1=U_1 * I_1=0 * 4000H) is elaborated:
At this sampled point first, Icon_ (n-1)=Icon_0=110, the system oscillator frequency is 12MHz, therefore:
E＝Pd－P_1＝0*5000H－0*4000H＝0*1000H；
Pcon_1＝E?/?Pcon_G＝0*1000H?/?200＝20.48≈20；
Icon_1＝Icon_0+E?/?Icon_G＝110?+?0*1000H?/?1600＝?110+2.56≈112；
Pulse_1＝Pcon_1?+Icon_1＝20+112＝132；
So after sampled point first, between the double sampling point, service time=132 of IGBT * 1/(12 * 1000000)=11us.
Namely after constantly first sampling of 20ms, the control IGBT of system is that 11us carries out work with the service time of counter register Pulse_1=132, until constantly again sampling of 40ms.
In the present embodiment, the power adjustments stage, when calculating E/Icon_G=0 * 1000H/1600=2.56, in the single-chip microcomputer processing procedure, remainder 0.56 can be given up, only preserve the merchant, can process to system and bring error this moment, along with the accumulation of time, this error can be amplified gradually, causes the deviation of system to increase.
Therefore, the present invention has also increased the auto-compensation of systematic error, system processes in the E/Icon_G process, remainder is preserved in real time, and add up, adjust in the adjustment process of IGBT service time Counter Value Pulse_n=Pcon_n+Icon_n at each, automatically confirm the relation of accumulated value and the Icon_G of E/Icon_G remainder, if accumulated value is 1600 more than or equal to Icon_G(), then the parameter of Icon_n added up 1; If accumulated value is less than or equal to-IconGain(namely-1600), then the parameter of Icon_n is successively decreased 1, realize the auto-compensation of error with this.
Do not increase this auto-compensation, power control curve can be as shown in Figure 1, and power output can't fast and stable; After increasing this auto-compensation, power control curve can as shown in Figure 2, obtain suitable power stage fast.
In the power adjustments stage, the variation of line voltage unavoidably can appear, especially when line voltage increases suddenly, if system can't fast reaction, because P=U * I can cause power output too high, damage the IGBT of system control circuit.
Therefore, the present invention has also increased the voltage jump processing, when operating voltage U increases suddenly 3～20 AD values of amplitude of setting, Icon_n is directly reduced 3～60.In the present embodiment when operating voltage U increases suddenly the amplitude of setting, AD value such as voltage U increases suddenly above 8 AD values, at this moment, Icon_n is directly reduced certain amplitude, such as 20, can respond fast with the assurance system, the power output rapid adjustment is adjusted to setting power output again behind the safety zone.
With shown in Fig. 1, Fig. 2 first sampled point b data (P_1=U_1 * I_1=0 * 4000H) be elaborated: when operating voltage U suddenly increases 8 AD values,
Icon_1＝Icon_0?+E?/?Icon_G－20＝112－20＝92；
Pulse_1＝?Pcon_1?+Icon_1＝20+92＝112；
After constantly first sampling of 20ms, the control IGBT of system carries out work with the service time that counter register Pulse_1=112 determine, until constantly again sampling of 40ms.
Claims (3)
1. the control method of an electromagnetic heating power is characterized in that may further comprise the steps:
Step 1, default stage of parameter: set initial value Icon_0, the proportional control factor Pcon_G of the initial value Pcon_0, the integral control amount Icon that heat target power Pd, systematic sampling cycle T, proportional control amount Pcon and the parameter of integral control coefficient Icon_G;
Step 2, power adjustments control stage: carry out power adjustments control, comprise starting stage and power adjustments stage, in the starting stage, IGBT carries out work with initial service time Counter Value Pulse_0, until system samples first by sampling period T, Pulse_0=Pcon_0+Icon_0 wherein; In the power adjustments stage, system is according to electric current I _ n, the voltage U _ n of setup parameter and real-time sampling, the service time Counter Value Pulse_n of calculating IGBT before next time sampling, and carry out work with the new IGBT service time Counter Value Pulse_n that calculates, until system samples by sampling period T next time, repeat to sample, calculate the IGBT service time Counter Value after the adjustment, until finish; In the power adjustments stage, the IGBT service time Counter Value Pulse_n of system-computed before next time sampling may further comprise the steps:
Real-time sampling electric current I _ n, voltage U _ n calculate real-time power output P_n:P_n=U_n * I_n; Calculate the difference E:E=Pd-P_n of real-time power output P_n and target power Pd;
Calculate front new proportional control amount Pcon_n value and the integral control amount Icon_n value of next time sampling: Pcon_n=E/Pcon_G, Icon_n=Icon_(n-1)+E/Icon_G, wherein Icon_(n-1) be the integral control amount before the sampling;
Calculate front new IGBT service time Counter Value Pulse_n value: the Pulse_n=Pcon_n+Icon_n of next time sampling.
2. the control method of described electromagnetic heating power according to claim 1, it is characterized in that: the power adjustments stage also comprises the auto-compensation of systematic error, system processes in the E/Icon_G process, remainder is preserved in real time, and add up, adjust in the adjustment process of IGBT service time Counter Value Pulse_n=Pcon_n+Icon_n at each, automatically confirm the relation of accumulated value and the Icon_G of E/Icon_G remainder, if accumulated value more than or equal to Icon_G, then adds up 1 to the parameter of Icon_n; If accumulated value then successively decreases 1 to the parameter of Icon_n less than or equal to-Icon_G.
3. according to claim 1 to the control method of 2 each described electromagnetic heating powers, it is characterized in that: the power adjustments stage, also comprise the voltage jump processing, when operating voltage U increases suddenly 3～20 AD values of amplitude of setting, Icon_n is directly reduced certain amplitude 3～60.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102522969B (en) * | 2011-12-12 | 2013-11-06 | 佛山市顺德区美的电热电器制造有限公司 | Anti-interference method of IGBT (Insulated Gate Bipolar Translator) |
| CN103813557B (en) * | 2014-02-17 | 2016-02-03 | 美的集团股份有限公司 | Electromagnetic heater and Poewr control method thereof and power control system |
| CN106211393B (en) * | 2015-04-30 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Heating power control method and device of electromagnetic heating system |
| CN106572552B (en) * | 2015-10-13 | 2019-09-27 | 佛山市顺德区美的电热电器制造有限公司 | The control method and device of the service time of power switch tube in electromagnetic heating system |
| CN108811212B (en) * | 2017-05-02 | 2021-12-24 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, heating control method and heating control device thereof |
| CN107184171B (en) * | 2017-06-06 | 2019-04-23 | 佛山市顺德区美的洗涤电器制造有限公司 | Heating means and heating device |
| CN107461772A (en) * | 2017-06-14 | 2017-12-12 | 珠海格力电器股份有限公司 | A kind of electromagnetic oven control method, control device and computer-readable recording medium |
| CN109548208B (en) * | 2017-09-22 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker and control method and control device thereof |
| CN109938616B (en) * | 2017-12-21 | 2020-12-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking utensil and output power calculation method thereof |
| CN108273174A (en) * | 2017-12-29 | 2018-07-13 | 北京怡和嘉业医疗科技股份有限公司 | Power regulating method, device and ventilator humidifier |
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| JP3735465B2 (en) * | 1998-06-30 | 2006-01-18 | 株式会社東芝 | microwave |
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|---|---|---|---|---|
| CN1293018A (en) * | 1999-10-16 | 2001-05-02 | Lg电子株式会社 | Device and method for controlling cooker |
| CN1684553A (en) * | 2005-03-10 | 2005-10-19 | 深圳市拓邦电子科技股份有限公司 | Double control electromagnetic heating control system |
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