CN201967167U - Induction heating dual-cycle controller - Google Patents
Induction heating dual-cycle controller Download PDFInfo
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- CN201967167U CN201967167U CN201120035598XU CN201120035598U CN201967167U CN 201967167 U CN201967167 U CN 201967167U CN 201120035598X U CN201120035598X U CN 201120035598XU CN 201120035598 U CN201120035598 U CN 201120035598U CN 201967167 U CN201967167 U CN 201967167U
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Abstract
The utility model discloses a current voltage double closed-loop power control and digital frequency tracking control circuit of an induction heating dual-cycle controller, which comprises a main circuit, a current voltage signal detection circuit, a lossless buffer double closed-loop control circuit and a fixed angular frequency tracking control circuit. A lossless buffer soft PWM (Pulse-Width Modulation) chopper and a buffering circuit adopt voltage regulation as an inner ring and adopt current regulation as an outer ring, so that the influence of power grid fluctuation and load variation on an output power is overcome and a constant power output is ensured. The constant power output is ensured by the fixed angular frequency tracking control circuit, so that a power factor angle of an inverter can be ensured to keep constant without changing along with a working frequency and load characteristics of the inverter, and control requirements on the control circuit under the condition with external interference can still be met. Therefore, the current voltage double closed-loop power control and digital frequency tracking control circuit has important significances for improving the thermal efficiency of induction heating and ensuring the heating consistency.
Description
Technical field
The utility model relates to a kind of heating controller, relates in particular to the two cycle controllers of a kind of induction heating.
Background technology
Induction heating power has obtained extensive use at heat treatment industry.The inverter load that it adopts has series resonance and parallel resonance dual mode usually.The former is applicable to high impedance, needs the occasion of Fraquent start; The latter is applicable to Low ESR, the occasion that the load change scope is big.At present, the power output of Parallel Resonant induction heating power is regulated, and mainly is to realize by the input direct voltage mode that changes inverter.Adopt the Thyristor Controlled rectification, realize that the major defect of direct current voltage reulation power adjustments is that power factor is low, serious when controlling deeply to the harmonic pollution of net side.Adopting the hard chopper control Power Regulation of traditional direct current is a reasonable scheme, but the power device general work is in the hard switching state, and switching loss is big, and EMI is serious.In order further to improve power supply capacity and efficient, improve the EMC performance of device, require based on the novel induction heating power of full-control type device not only inverter realize soft switch; And staring blankly stream copped wave power regulation circuit also should be realized soft switch.
Because parallel connection type resonance inversion circuit must have the automatic frequency tracking function.This is one of basic function of inverter, all can constantly change with temperature owing to be heated workpiece its physical property (resistivity, permeability etc.) in heating process, thereby the natural resonance frequency of load circuit also can change thereupon.In order to make the inverter reliably working, inverter control circuit must have the automatic frequency adjustment ability, to adapt to the variation of load.Simultaneously for the trouble free service of parallel-type converter, should guarantee that inverter is operated under the capacitive state, promptly the output current phase place is ahead of the output voltage phase place, and then control circuit must satisfy output and triggers frequency and be higher than the load natural resonance frequency.Triggering for the upper and lower brachium pontis switching device of shunt chopper, must observe the principle of " open earlier, afterwards turn-off ", be between the conducting pulse of upper and lower brachium pontis switching device to be arranged an overlapping time, and in order to make switching device carve turn-on and turn-off when appropriate, overlapping time, size must be along with the variation adjustment of load.In order to make inverter that stronger frequency adaptability and workload-adaptability be arranged, it is constant that the power-factor angle of inverter should keep, and do not follow inverter operating frequency and load characteristic and change.Control circuit has enough strong antijamming capability, and this is the basic demand of control circuit, guarantee that control circuit can reach the control requirement having under the situation of external interference.
The utility model content
The technical problems to be solved in the utility model is to have proposed the two cycle controllers of a kind of induction heating, this induction heating power controller has overcome the influence that power output is subjected to power network fluctuation and load variations, guaranteed permanent power output, the power-factor angle that can guarantee inverter simultaneously keeps constant, do not follow inverter operating frequency and load characteristic and change, can satisfy control circuit and so can reach the control requirement following of the situation that external interference is arranged.
For solving the problems of the technologies described above, the two cycle controllers of the induction heating that the utility model proposes include main circuit, the current and voltage signals testing circuit, and the two closed control circuits of nondestructive buffering are decided the angular frequency follow-up control circuit.It is characterized in that: described main circuit is used for civil power is converted into the high-frequency alternating current of induction heating load needs, and described current and voltage signals testing circuit is used to detect main circuit dc bus current, dc voltage, alternating voltage; The two closed control circuits of described nondestructive buffering are used for the control to direct voltage; Describedly decide the angular frequency follow-up control circuit and be used for high performance of control from motion tracking and invertor operation state to parallel-type converter load frequency.
Induction heating power of the present utility model, by the two closed-loop control strategies of nondestructive buffering with decide angular frequency tracking Control strategy, make induction heating can when input electrical network and load variations, can keep permanent power output, make power-factor angle when reverse frequency and load variations, keep constant, satisfied the high requirement of induction heating power anti-interference.
Description of drawings
The system block diagram of the soft copped wave Power Regulation of Fig. 1 parallel resonance induction heating controller;
Fig. 2 decides angular frequency tracking Control strategy block diagram;
The phase demodulation waveform of Fig. 3 CD4046BE;
The absolute value integrating circuit of Fig. 4 load voltage UH;
Fig. 5 direct current sample circuit;
Fig. 6 CD4046 phase discriminator.
Embodiment
In order to introduce the utility model in further detail, be described in detail below in conjunction with accompanying drawing.
Figure 1 shows that the system block diagram of soft copped wave Power Regulation parallel resonance induction heating controller, include main circuit, the current and voltage signals testing circuit, the two closed control circuits of nondestructive buffering are decided the angular frequency follow-up control circuit.The main circuit principle is that three-phase is not controlled the rectifier bridge rectifier bridge and carried out the direct voltage that rectification obtains pulsing by the phase commercial power, through obtaining level and smooth direct voltage after the Cd filtering; By the soft PWM BUCK of a kind of active buffering converter direct voltage is carried out power adjustments then and obtain adjustable level and smooth direct current; Finally the direct current that prime obtains is carried out the interchange supply load that inversion obtains high frequency by the parallel resonance device; Gather dc bus current by LEM, gather direct voltage, soft PWM chopper of nondestructive buffering and buffer circuit are partly by ring in the voltage-regulation, Current Regulation outer shroud, the assurance power output of knowing clearly does not change under the situation of power network fluctuation and load variations, has guaranteed permanent power output.
As Fig. 2, shown in Figure 3, this control strategy is got the output voltage U of inverter
HAs the feedback signal of frequency loop, obtain and U through the zero passage comparison circuit
HThe square wave of same-phase same frequency, this square wave passes through charge pump phase discriminator (CD4046 phase discriminator 2) [2 π---2 π] department frequency discrimination phase demodulation together with the PWM control impuls of MCU output, obtains the phase difference of the two; Obtain reflecting the direct current of this phase difference size again through low pass filter.
In the moment of induction heating power initial start, the load resonant voltage signal is not set up as yet, then above circuit will be because there not being feedback signal can't the generation effect, therefore except the basic function that realizes frequency-tracking, also must realize start unit that load resonant voltage is set up by software.The utility model main circuit adopts full-control type device IGBT as the shunt chopper power device.Adopt its more satisfactory sharp start mode that changes self-excitation, design has its to swash soft start program.
After load resonant voltage was set up, control program was transformed into the automatic frequency tracking pattern from its energizing mode, and the conversion between two kinds of patterns realizes by the judgement statement in the program, and set up the load voltage signal U of certain amplitude stability
HIt is the criterion of mode switch.In order to make the parallel resonance can the safe change of current when changing greatly at load current, MCU can change the value of dead band register by the sampling direct current, thereby adjusts the output driving pulse size of overlapping time.
Figure 4 shows that the absolute value integrating circuit (or being called precise rectification circuit) of load voltage UH, on the one hand in inverter startup, can judge having or not of load voltage, swash and the foundation of the conversion of self-excitation state as it by the sampled value of this circuit.Starting successfully on the other hand, during the system operation with closed ring, the sampled value of this circuit can be used as the feedback quantity of power controller.
Fig. 5 is the sample circuit of direct current: direct current is sampled into by LEM, gains by the amplifying circuit adjustment.Again by sending into the MCU sampling behind low-pass filtering, the voltage follow.
Figure 6 shows that the CD4046 phase discriminator, load resonant voltage U H passes through dividing potential drop, after the amplification, zero passage comparison circuit by the LM311 formation, obtain synchronous square wave, the output pwm signal of this square wave and MCU is sent into CD4046 together and is made phase demodulation, obtains DC level through low-pass filtering, will send into the MCU sampling after its amplitude adjustment.The Schmidt trigger 74LS14 of two series connection plays time-delay and jamproof effect.
The utility model proposes based on MCU parallel-type converter numerical frequency tracking Control.Characteristics of resources on the sheet that utilizes the ultrafast arithmetic speed of high speed MCU and enrich realizes the high performance of control from motion tracking and invertor operation state to parallel-type converter load frequency.Guarantee no matter load be heavy duty, underloading, or heating process under the natural frequency situation about changing, control circuit can both be adjusted the triggering control signal of being sent automatically, make shunt chopper be operated in little capacitive state, output power factor is a definite value substantially, thereby guarantee the trouble free service of inverter, improve the reliability of power supply.
Above only the act illustrates the utility model with convenience, and in not breaking away from creation spirit category of the present utility model, any any covert modification and distortion that the technical staff did of knowing this technology still belongs to protection category of the present utility model.
Claims (1)
1. the two cycle controllers of induction heating include main circuit, the current and voltage signals testing circuit, and the two closed control circuits of nondestructive buffering are decided the angular frequency follow-up control circuit, and the parallel-type converter load is characterized in that:
Described main circuit is used for civil power is converted into the high-frequency alternating current of induction heating load needs;
Described current and voltage signals testing circuit is used to detect main circuit dc bus current, dc voltage, alternating voltage;
The two closed control circuits of described nondestructive buffering are used for direct voltage is controlled;
Describedly decide the angular frequency follow-up control circuit and be used for high performance of control from motion tracking and invertor operation state to parallel-type converter load frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120035598XU CN201967167U (en) | 2011-01-30 | 2011-01-30 | Induction heating dual-cycle controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120035598XU CN201967167U (en) | 2011-01-30 | 2011-01-30 | Induction heating dual-cycle controller |
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| CN201967167U true CN201967167U (en) | 2011-09-07 |
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| CN201120035598XU Expired - Fee Related CN201967167U (en) | 2011-01-30 | 2011-01-30 | Induction heating dual-cycle controller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388065A (en) * | 2012-05-10 | 2013-11-13 | 宝山钢铁股份有限公司 | Large-diameter support roller integral induction heating system and control method thereof |
| WO2013189242A1 (en) * | 2012-06-18 | 2013-12-27 | 美的集团股份有限公司 | Protective circuit for high frequency heating device and high frequency heating device having same |
| CN108448693A (en) * | 2018-03-13 | 2018-08-24 | 武汉理工大学 | Radio energy transmission system and its control method for AGV |
| CN109379795A (en) * | 2018-11-29 | 2019-02-22 | 洛阳升华感应加热股份有限公司 | The reverse frequency of induction heating power tracks locking phase control system |
| CN114007293A (en) * | 2021-10-20 | 2022-02-01 | 成都利尼科医学技术发展有限公司 | Magnetron filament heating current control system |
-
2011
- 2011-01-30 CN CN201120035598XU patent/CN201967167U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388065A (en) * | 2012-05-10 | 2013-11-13 | 宝山钢铁股份有限公司 | Large-diameter support roller integral induction heating system and control method thereof |
| CN103388065B (en) * | 2012-05-10 | 2014-12-24 | 宝山钢铁股份有限公司 | Large-diameter support roller integral induction heating system and control method thereof |
| WO2013189242A1 (en) * | 2012-06-18 | 2013-12-27 | 美的集团股份有限公司 | Protective circuit for high frequency heating device and high frequency heating device having same |
| RU2608179C2 (en) * | 2012-06-18 | 2017-01-17 | Мидеа Групп Ко., Лтд | High-frequency induction heating device protection circuit and high-frequency induction heating device with protection circuit |
| CN108448693A (en) * | 2018-03-13 | 2018-08-24 | 武汉理工大学 | Radio energy transmission system and its control method for AGV |
| CN108448693B (en) * | 2018-03-13 | 2022-03-18 | 武汉理工大学 | Wireless power transmission system for AGV and control method thereof |
| CN109379795A (en) * | 2018-11-29 | 2019-02-22 | 洛阳升华感应加热股份有限公司 | The reverse frequency of induction heating power tracks locking phase control system |
| CN109379795B (en) * | 2018-11-29 | 2021-08-10 | 洛阳升华感应加热股份有限公司 | Inversion frequency tracking phase-locking control system of induction heating power supply |
| CN114007293A (en) * | 2021-10-20 | 2022-02-01 | 成都利尼科医学技术发展有限公司 | Magnetron filament heating current control system |
| CN114007293B (en) * | 2021-10-20 | 2024-03-29 | 成都利尼科医学技术发展有限公司 | Magnetron filament heating current control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20150130 |
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| EXPY | Termination of patent right or utility model |