CN102681453A - Electric heating controller and control method thereof - Google Patents
Electric heating controller and control method thereof Download PDFInfo
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- CN102681453A CN102681453A CN2012101574288A CN201210157428A CN102681453A CN 102681453 A CN102681453 A CN 102681453A CN 2012101574288 A CN2012101574288 A CN 2012101574288A CN 201210157428 A CN201210157428 A CN 201210157428A CN 102681453 A CN102681453 A CN 102681453A
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Abstract
The invention relates to an electric heating controller and a control method thereof. The electric heating controller comprises an electric heating part, a switch circuit and a drive circuit, and is characterized by further comprising a low-voltage detection circuit and a main control chip MCU (microprogrammed control unit), wherein the switch circuit is used for controlling switching on-off of an alternating current power supply, the drive circuit is arranged on the switch circuit, and the main control chip MCU is at least provided with a timer. The control method of the electric heating controller comprises the following steps of: quickly carrying out switching on-off control of an electric heating part during a shorter period to realize regulation of heating power of the electric heating part; and simultaneously, preventing a flicker effect of a lighting device caused by instant and quick change of power of the electric heating part by utilizing a soft-start and soft-switching-off gradual-change power regulating method in an initial stage and a finishing stage for controlling the switching on-off, and also avoiding uncomfortableness of a user on light change. According to the invention, infinite power regulation can be realized, the comfortable experience of the user is improved, dissipation power of heating of the switch circuit is less compared with that in a chopping scheme, simultaneously a flicker problem is effectively avoided by utilizing soft starting and soft switching-off, and practical application effect is good.
Description
Technical field
The present invention relates to a kind of electric heating control device and control method thereof, belong to the control technology of the electric heating device in domestic air conditioner field.
Background technology
The electric auxiliary heating control technology in existing domestic air conditioner field; The main control method that adopts is: 1. use relay that electric heating device is carried out break-make control; Because relay can not be realized break-make control fast, cause leaving air temp very inhomogeneous so be used as when the variable power of realizing electric heater is controlled, leaving air temp is very high when opening; Descend again much but break off the back temperature, make the comfortableness variation.2. simply use electronic switch such as controllable silicon to carry out electrodeless electric power and regulate, in the semiperiod of each civil power, carry out copped wave control, though effectively electric power can realize electrodeless adjusting; Comfortableness has improved; But the electromagnetic interference (EMI) to electrical network has increased the weight of, and power factor has also descended simultaneously, owing to constantly carry out break-make copped wave; The dynamic switch loss of electronic switch parts is also very big, brings more serious heat dissipation problem.3. use electronic switch such as controllable silicon to carry out the break-make control that civil power is striden the cycle; Such as opening 1s; Turn-off 1s,, reach a kilowatt rank because the power of the electric heating device of general air conditioner is bigger; Make the flicker problem to occur when carrying out opening or turn-offing faster, the illumination to the user when domestic. applications produces serious influence.Therefore, be necessary to do further improvement.
Summary of the invention
The object of the invention aim to provide a kind of rational in infrastructure, control is convenient, use comfortable electric heating control device and control method thereof, to overcome weak point of the prior art.
A kind of electric heating control device by this purpose design; Comprise electrical heating portion, the on-off circuit of control AC power break-make, the driving circuit of on-off circuit; Its architectural feature is also to comprise low-voltage detection circuit and main control chip MCU, is provided with a timer among the main control chip MCU at least.
The input of said voltage detecting circuit is parallelly connected with the two ends of AC power, and output is connected to main control chip MCU, and main control chip MCU connects with driving circuit, on-off circuit.
A kind of electric heating controlling method is characterized in that controlling according to following method:
1) break-make of main control chip MCU through driving circuit CS circuit carried out break-make control to electrical heating portion, service time T1 with trip time T2 confirm by main control chip MCU, for the 50Hz civil power, satisfied: 20ms≤T1≤600s, 20ms≤T2≤600s; For the 60Hz civil power, satisfy: 15ms≤T1≤600s, 15ms≤T2≤600s;
2) use soft Starting Technology at the initial period of opening; Soft Starting Technology be exactly half period with the free period of civil power be control cycle; For 50Hz civil power control cycle is 10ms; For 60Hz civil power control cycle is 1/120ms, makes that the voltage effective value in each semiperiod progressively increases, up to reaching maximum effective value;
3) use soft shutoff technology in the ending phase of opening; The soft technology of turn-offing be exactly half period with the free period of civil power be control cycle; For 50Hz civil power control cycle is 10ms; For 60Hz civil power control cycle is 1/120ms, makes that the voltage effective value in each semiperiod gradually reduces, up to turn-offing fully.
Detect the time point that the instantaneous absolute value of AC supply voltage is lower than a certain magnitude of voltage V1 through the control low-voltage detection circuit; V1 is greater than 0V but less than the magnitude of voltage of 300V; The voltage of AC power begins to raise gradually when reaching the V1 value as triggering x1 constantly from 0V; The instantaneous value of line voltage raises gradually and reaches that beginning descends gradually behind the mxm., when dropping to V1 value as triggering moment x2.
In semiperiod, trigger RP constantly, timer timing Td at least one civil power in x1 conduct constantly; Td=x2-x1 triggers and opens electrical heating portion after being timed to, turn-off during for 0V up to the line voltage instantaneous value; In follow-up control, the Td time is reduced gradually, electrical heating portion constantly shifts to an earlier date in the triggering and opening of each half civil power in the cycle gradually like this; Making the forward voltage effective value of electrical heating portion increase gradually, so repeatedly, is 0 up to the timing Td of timer; In the x1 time trigger and open electrical heating portion; Accomplish the soft function of opening, beginning electrical heating portion in the semiperiod of next civil power will be open-minded always, up to getting into soft off-phases.
In semiperiod, trigger RP constantly, timer timing Td at least one civil power in x1 conduct constantly; Td=0 triggers and opens electrical heating portion after being timed to, turn-off during for 0V up to the line voltage instantaneous value; In follow-up control, the Td time is increased gradually, like this electrical heating portion each half civil power in the cycle triggering and open and constantly delay gradually; Make the forward voltage effective value of electrical heating portion reduce gradually, so repeatedly, up to the timing Td=x2-x1 of timer; In the x2 time trigger and open electrical heating portion; Accomplish soft turn-off function, beginning electrical heating portion in the semiperiod of next civil power will turn-off always, up to getting into soft opening the stage.
Said triggering RP constantly is the x1 moment, or x2 constantly, or two moment all participate in as triggering RP constantly.
Said low-voltage detection circuit can also be a zero cross detection circuit, and the rising edge of the zero cross fired pulse that zero cross detection circuit produces or negative edge just become triggering RP constantly.
The foundation that above-mentioned service time T1 and trip time, T2 confirmed is: make when the break-make control of carrying out electrical heating portion; The air outlet temperature variation of air conditioner is not more than some predetermined values; Be generally and be no more than 2 ℃; Also can adjust as required, carry out confirming of T1 and T2 on this basis.In general; Electric heating element all is the material that certain thermal capacity is arranged; No matter be heating wire and support material or PTC and propping material thereof, all comprised a certain amount of thermal content after itself being heated to uniform temperature, the heat content of the material that specific heat is big more is big relatively more.Turn-offing the later heating of electrical heating portion mainly is exactly the thermal content of having utilized electroheat member.
Using the purpose of this programme is exactly to guarantee opening or blocking interval at electronic switch; It is complete civil power half period; Avoid civil power is carried out copped wave control; Effectively reduce the electromagnetic interference (EMI) that civil power copped wave is produced, reduce turning on and off the dynamic switch loss that moment electronic switch produces fast, reduce the heating of electronic switch.On the other hand, this programme has adopted opening and has constantly used soft Starting Technology, has used soft shutoffs technological constantly turn-offing, and has effectively avoided the generation of scintillation, has avoided the influence of illumination effect, makes the illumination of subscriber household normally to use.
The present invention can realize electrodeless power adjustments, improves user's comfortableness and experiences, and the heating of on-off circuit is more much smaller than dissipation power with the copped wave scheme, and the flicker problem has effectively been avoided in the use of soft start and soft shutoff simultaneously, and practical application effect is good.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the control timing figure of one embodiment of the invention;
Fig. 3 is the copped wave sequential chart of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Referring to Fig. 1-Fig. 3; A kind of electric heating control device; Comprise electrical heating portion 1, the on-off circuit 2 of control AC power break-make, the driving circuit 4 of on-off circuit 2, also comprise low-voltage detection circuit 3 and main control chip MCU5, be provided with a timer 51 among the main control chip MCU5 at least.Low-voltage detection circuit 3 inputs are parallelly connected with the two ends of AC power, and output is connected to main control chip MCU5, and main control chip MCU5 connects with driving circuit 4, on-off circuit 2.
Main control MCU 5 is carried out break-make control through the break-make of driving circuit 4 CS circuit 2 to electrical heating portion 1, service time T1 with trip time T2 confirm satisfied by main control MCU 5: 0s≤T1≤30s, 0s≤T2≤30s, T1+T2=30s.
Wherein 0～t1 time period is the soft start stage, time 1s, and t2～t3 time period is soft off-phases, and time 1s, T1 are service time, and T2 is the turn-off time.Adjustment T1 and T2 just can regulate the heating power of electric heater, and low-voltage detection circuit 3 detects the time point that AC supply voltage instantaneous voltage value absolute value is lower than 50V.The voltage of AC power begins to raise gradually when reaching 50V as triggering x1 constantly from 0V, and beginning descended gradually after the instantaneous value of line voltage raise gradually and reaches mxm., when dropping to 50V as triggering x2 constantly.
The method of soft start is: the time interval of in the preceding half period that starts first, detecting between x1 and the x2 with timer 51.In the semiperiod of the civil power after startup; Constantly as triggering RP constantly, timer 51 timing Td trigger and open electrical heating portion 1 after being timed to x1; Turn-off during up to the line voltage instantaneous value for 0V; In follow-up control, the Td time is reduced according to fixing stepping time δ ms gradually: δ=0.09ms, the number of steps N of adjustment is: N=(x2-x1)/δ.
Timing with x1 timer 51 begins the trigger point, and timing Td is:
Td＝n×δ，n＝1、2、……、N。
First is opened among the timing Td of timer 51 of half period and gets n=N, begins to trigger and open electrical heating portion 1 after being timed to, and reaches 0V electrical heating portion up to the instantaneous voltage of this half period and turn-offs, and gets into next adjustment cycle; In next adjustment cycle, successively the n among the timing Td is subtracted 1, make the cycle of opening increase gradually, up to n=0.Get into the T1 timing stage afterwards, on-off circuit 2 is open-minded fully.If N less than 100, then adjusts the δ value, the N value that makes approximates 100 in the reality test.
The method of soft shutoff is: the time interval of in the preceding half period that starts first, detecting between x1 and the x2 with timer 51.In semiperiod, trigger RP constantly, timer 51 timing Td at a civil power in x1 conduct constantly; Td=0; Trigger and open electrical heating portion 1 after being timed to, turn-off during up to the line voltage instantaneous value, in follow-up control for 0V; The Td time is increased according to fixing stepping time δ ms gradually: δ=0.09ms, the number of steps N of adjustment is: N=(x2-x1)/δ.
Timing with x1 timer 51 begins the trigger point, and timing Td is:
Td＝n×δ，n＝1、2、……、N。
First is opened among the timing Td of timer 51 of half period and gets n=0, begins to trigger and open electrical heating portion 1 after being timed to, and reaches 0V electrical heating portion up to the instantaneous voltage of this half period and turn-offs, and gets into next adjustment cycle; In next adjustment cycle, successively the n among the timing Td is added 1, make the cycle of opening increase gradually, up to n=N.If N less than 100, then adjusts the δ value, the N value that makes approximates 100 in the reality test.Get into the T2 timing stage afterwards, on-off circuit 2 turn-offs fully.
In the foregoing description, trigger constantly RP and be x1 constantly, also can be x2 constantly or two moment all participate in as triggering RP constantly.If use x2 constantly as triggering RP constantly, then on controlling schemes, adjust slightly, also be easy to realize as the slip-stick artist in the industry; Exactly the moment x2 in this cycle is controlled the break-make of next civil power in the cycle as the trigger point: such as, timer 51 in the x2 time trigger, timing Td=10ms; Be timed to and open on-off circuit 2; Td gradually reduces subsequently, when Td=x2+x1, finishes soft start control, gets into the logical control of standard-sized sheet.The method as triggering moment RP is similar with above-mentioned method constantly to use two, is not repeating.
Low-voltage detection circuit 3 can also be a zero cross detection circuit; The general low-voltage detection circuit 3 with the civil power instantaneous value of the topological structure of zero cross detection circuit is the same; But being provided with of circuit parameter tangible difference is arranged, general as far as possible little with the width of zero-crossing pulse, more little zero crossing is accurate more.Use the rising edge or the negative edge of the zero cross fired pulse of zero cross detection circuit generation just to become triggering RP constantly.
The above is merely exemplary embodiments of the present invention; Be not limited to the present invention; For a person skilled in the art, the present invention can have multiple change and variation, and is all within spirit of the present invention and principle; Any modification of being made, improve or be equal to replacement, all should be included within the claim scope of the present invention.
Claims (8)
1. electric heating control device; Comprise electrical heating portion (1), the on-off circuit (2) of control AC power break-make, the driving circuit (4) of on-off circuit; It is characterized in that also comprising low-voltage detection circuit (3) and main control chip MCU (5), be provided with a timer (51) among the main control chip MCU at least.
2. electric heating control device according to claim 1; The input that it is characterized in that said low-voltage detection circuit (3) is parallelly connected with the two ends of AC power; Output is connected to main control chip MCU (5), and main control chip MCU (5) connects with driving circuit (4), on-off circuit (2).
3. control method according to the said electric heating control device of claim 2 is characterized in that controlling according to following method:
1) main control chip MCU (5) is through the break-make of driving circuit (4) CS circuit (2); Electrical heating portion (1) is carried out break-make control; Service time T1 and trip time T2 confirm by main control chip MCU (5); For the 50Hz civil power, satisfy: 20ms≤T1≤600s, 20ms≤T2≤600s; For the 60Hz civil power, satisfy: 15ms≤T1≤600s, 15ms≤T2≤600s;
2) use soft Starting Technology at the initial period of opening; Soft Starting Technology be exactly half period with the free period of civil power be control cycle; For 50Hz civil power control cycle is 10ms; For 60Hz civil power control cycle is 1/120ms, makes that the voltage effective value in each semiperiod progressively increases, up to reaching maximum effective value;
3) use soft shutoff technology in the ending phase of opening; The soft technology of turn-offing be exactly half period with the free period of civil power be control cycle; For 50Hz civil power control cycle is 10ms; For 60Hz civil power control cycle is 1/120ms, makes that the voltage effective value in each semiperiod gradually reduces, up to turn-offing fully.
4. according to the control method of the said electric heating control device of claim 3; It is characterized in that detecting the time point that the instantaneous absolute value of AC supply voltage is lower than a certain magnitude of voltage V1 through control low-voltage detection circuit (3); V1 is greater than 0V but less than the magnitude of voltage of 300V; The voltage of AC power begins to raise gradually when reaching the V1 value as triggering x1 constantly from 0V, and beginning descended gradually after the instantaneous value of line voltage raise gradually and reaches mxm., when dropping to V1 value as triggering moment x2.
5. according to the control method of the said electric heating control device of claim 4, it is characterized in that at least one civil power in the semiperiod, trigger RP constantly in x1 conduct constantly; Timer (51) timing Td, Td=x2-x1 triggers and opens electrical heating portion (1) after being timed to; Turn-off during up to the line voltage instantaneous value, in follow-up control, the Td time is reduced gradually for 0V; Constantly shifting to an earlier date gradually in the triggering and opening of each half civil power in the cycle of electrical heating portion makes the forward voltage effective value of electrical heating portion increase gradually, so repeatedly like this; Up to the timing Td of timer is 0, in the x1 time trigger and open electrical heating portion (1), accomplishes the soft function of opening; Beginning electrical heating portion (1) in the semiperiod of next civil power will be open-minded always, up to getting into soft off-phases.
6. according to the control method of the said electric heating control device of claim 4, it is characterized in that at least one civil power in the semiperiod, trigger RP constantly in x1 conduct constantly; Timer (51) timing Td, Td=0 triggers and opens electrical heating portion (1) after being timed to; Turn-off during up to the line voltage instantaneous value, in follow-up control, the Td time is increased gradually for 0V; Like this electrical heating portion each half civil power in the cycle triggering and open and constantly delay gradually, make the forward voltage effective value of electrical heating portion reduce gradually, so repeatedly; Up to the timing Td=x2-x1 of timer, in the x2 time trigger and open electrical heating portion, accomplish soft turn-off function; Beginning electrical heating portion in the semiperiod of next civil power will turn-off always, up to getting into soft opening the stage.
7. according to the control method of each said electric heating control device of claim 4-6, it is characterized in that said triggering moment RP is the x1 moment, or x2 constantly, or all participate in as triggering moment RP two moment.
8. according to the control method of the said electric heating control device of claim 7; It is characterized in that said low-voltage detection circuit (3) can also be a zero cross detection circuit, the rising edge of the zero cross fired pulse that zero cross detection circuit produces or negative edge just become triggering RP constantly.
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| CN103327239A (en) * | 2013-05-31 | 2013-09-25 | Tcl通讯（宁波）有限公司 | Camera data processing method based on mobile terminal and mobile terminal |
| CN105266598A (en) * | 2014-06-24 | 2016-01-27 | 佛山市顺德区美的电热电器制造有限公司 | Control method for cooking device, and cooking device |
| CN105276824A (en) * | 2015-11-24 | 2016-01-27 | 阿里斯顿热能产品(中国)有限公司 | Heating control method for rapid electric water heater compatible with EMC |
| CN105299819A (en) * | 2014-07-08 | 2016-02-03 | 美的集团武汉制冷设备有限公司 | Heating control device of air conditioner and power control method for heating control device |
| CN110873359A (en) * | 2018-08-31 | 2020-03-10 | 广东美的环境电器制造有限公司 | Control circuit, method and temperature control equipment |
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| CN110873359A (en) * | 2018-08-31 | 2020-03-10 | 广东美的环境电器制造有限公司 | Control circuit, method and temperature control equipment |
| CN110873359B (en) * | 2018-08-31 | 2022-03-11 | 广东美的环境电器制造有限公司 | Control circuit, method and temperature control equipment |
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