CN108495395B - All-digital induction heating power supply control system and control method - Google Patents
All-digital induction heating power supply control system and control method Download PDFInfo
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- CN108495395B CN108495395B CN201810298198.4A CN201810298198A CN108495395B CN 108495395 B CN108495395 B CN 108495395B CN 201810298198 A CN201810298198 A CN 201810298198A CN 108495395 B CN108495395 B CN 108495395B
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- 230000006698 induction Effects 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
The invention discloses a full digital induction heating power supply control system and a control method, wherein the full digital induction heating power supply control system comprises a rectifying and filtering circuit, a full bridge inverter circuit, an induction coil and a load module which are connected in sequence, and further comprises a digital signal processing unit and a microcontroller processing unit which are connected with each other; the digital signal processing unit is connected with an operation panel, a display module and a communication module; the microcontroller processing unit is connected with a temperature sensor module, an analog quantity control module and a soft start and automatic preheating control module. The invention has the advantages of flexibility, controllability, wide application range, low failure rate, stable performance and the like.
Description
Technical Field
The invention relates to a power supply control system, in particular to a full digital induction heating power supply control system and a control method.
Background
The traditional induction heating power supply control system based on analog chip control adopts analog chips to complete core actions such as phase locking of working frequency and the like due to waveform generation, so that the control chip in the control system only plays the peripheral roles of start-stop control, simple protection, display screen display and the like. For example, a typical induction heating power supply based on analog technology is taken as an example, a CD4046 hardware phase-locked loop is used for locking the working frequency and SG3525 is adopted for generating waveforms required by work, and since the CD4046 only can output a phase locking signal, the deviation of phase locking cannot be known, and the deviation angle of active phase locking cannot be controlled flexibly like software control, so that the purposes of flexibly adjusting the working frequency and protecting the power supply according to actual conditions are achieved. Particularly, under the use condition of different loads, the single-function analog phase lock can not be flexibly applied; similarly, the waveform output by SG3525 is not as flexible as software due to hardware limitation, for example, free and flexible adjustment of pulse width, and arbitrary control of output frequency. One of the drawbacks that it has is therefore: the phase lock and the frequency generation are completed by using different analog chips, and the communication between the two chips is also a simple level relation, so that more information exchange cannot be completed.
Generally, the application scope of the conventional induction heating power supply based on the analog chip technology is generally limited to a specific application in certain industries, and the application scope is narrow. When the load dynamic range is large (the load characteristic is relatively large along with the temperature change), the stability of the induction heating power supply cannot be ensured at all because the defects of generally higher fault rate, relatively unstable performance and the like exist.
Disclosure of Invention
In order to overcome the defects and the existing problems in the prior art, the invention provides an all-digital induction heating power supply control system and a control method, which have the advantages of flexibility, controllability, wide application range, low failure rate, stable performance and the like.
The invention is realized by the following technical scheme: the full digital induction heating power supply control system comprises a rectifying and filtering circuit, a full bridge inverter circuit, an induction coil and a load module which are sequentially connected, wherein the rectifying and filtering circuit is used for being connected with the power supply module, the full digital induction heating power supply control system further comprises a digital signal processing unit and a microcontroller processing unit which are mutually connected, voltage signals and current signals at the output end of the rectifying and filtering circuit are fed back to the digital signal processing unit, and current signals at the output end of the full bridge inverter circuit are fed back to the digital signal processing unit;
the digital signal processing unit is connected with an operation panel, a display module and a communication module; the microcontroller processing unit is connected with a temperature sensor module, an analog quantity control module and a soft start and automatic preheating control module.
Further, the microcontroller processing unit is also connected with a fan and a fault alarm output module.
Further, the microcontroller processing unit is also connected with a buzzer and an expansion display.
Preferably, the full-bridge inverter circuit is an IGBT H-bridge full-bridge inverter circuit; the temperature sensor module is a thermistor temperature sensor.
Preferably, the communication module is a 485 communication module.
The invention also provides a control method applied to the all-digital induction heating power supply control system, which comprises the following steps:
s1, powering up the system, and loading system data after the system completes hardware initialization;
s2, after the data is loaded successfully, after the system enters a standby state, updating various display contents required for a human-computer interface;
s3, acquiring communication information in the operation panel and the communication module;
s4, controlling peripheral equipment of the system;
s5, performing protection detection on system equipment;
s6, judging whether a command of the control system is effective or not, if so, selecting and entering a corresponding working mode for working, and if not, returning to a state;
s7, detecting whether the load is normal, entering an equipment running state if the load is normal, and returning to a standby state if the load is not normal;
s8, after the system enters the equipment running state, tracking the resonance frequency of the load in real time by using an all-digital phase locking technology, and enabling the working frequency of the system to be always controlled on the resonance frequency of the load, so that the system is ensured to run in the efficient working state.
Further, the step S8 further includes: carrying out parameter identification on the induction coil and the induction coil in the load module by utilizing a dynamic inductance value identification technology so as to search out the working frequency which can enable the system to work in an efficient running state; the system also utilizes a dynamic inductance value identification technology, and the heating state of the system is automatically adjusted according to the identified material by identifying the material of the load so that the system works in an efficient running state.
Preferably, the step S8 further includes: in the running state of the system, a fuzzy control technology is adopted, and the voltage, the current and the power of the system are pre-calculated in a closed loop in real time by simultaneously acting based on PWM+PFM pulse width modulation and frequency modulation, so that the system is in a running state with constant output power.
According to the full-digital induction heating power supply control system and the full-digital induction heating power supply control method, the resonant frequency of the load is tracked in real time by utilizing the full-digital phase locking technology, so that the working frequency of the system can be always controlled on the resonant frequency of the load, and the system is ensured to operate in a high-efficiency working state; the system utilizes a dynamic inductance value identification technology to identify parameters of the induction coil and the induction coil in the load module so as to search out the working frequency which can enable the system to work in an efficient running state; the system also utilizes a dynamic inductance value identification technology, identifies the material of the load, and automatically adjusts the heating state of the system according to the identified material so that the system works in an efficient running state; in addition, the system also adopts a fuzzy control technology, and performs closed-loop pre-operation on the voltage, current and power of the system in real time by simultaneously acting based on PWM+PFM pulse width modulation and frequency modulation, so that the system is in a running state with constant output power.
Compared with the prior art, the full-digital induction heating power supply control system provided by the invention has the advantages of flexibility, controllability, wide application range, low failure rate, stable performance and the like.
Drawings
Fig. 1 is a schematic block diagram of an all-digital induction heating power control system according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a method flow of the control method in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and specific embodiments for the understanding of those skilled in the art.
As shown in fig. 1, the full digital induction heating power supply control system comprises a rectifying and filtering circuit, a full bridge inverter circuit, an induction coil and a load module which are sequentially connected, wherein the rectifying and filtering circuit is used for being connected with the power supply module, the full digital induction heating power supply control system further comprises a digital signal processing unit and a microcontroller processing unit which are mutually connected, a voltage signal and a current signal at the output end of the rectifying and filtering circuit are fed back to the digital signal processing unit, and a current signal at the output end of the full bridge inverter circuit is fed back to the digital signal processing unit; the digital signal processing unit is connected with an operation panel, a display module and a communication module; the microcontroller processing unit is connected with a temperature sensor module, an analog quantity control module and a soft start and automatic preheating control module.
As a preferred embodiment, the microcontroller processing unit is also connected with a fan and a fault alarm output module; and the microcontroller processing unit is also connected with a buzzer and an expansion display.
As a preferred embodiment, the full-bridge inverter circuit is preferably an IGBT H-bridge full-bridge inverter circuit; the temperature sensor module is preferably a thermistor temperature sensor; the communication module is preferably a 485 communication module.
The embodiment of the invention also provides a control method applied to the all-digital induction heating power supply control system, which comprises the following steps:
s1, powering up the system, and loading system data after the system completes hardware initialization; the hardware initialization of the system comprises storage initialization, hardware external equipment initialization, all preparation before system operation and the like;
s2, after the data is loaded successfully, after the system enters a standby state, updating various display contents required for a human-computer interface;
s3, acquiring communication information in the operation panel and the communication module;
s4, controlling peripheral equipment of the system, wherein the peripheral equipment comprises a fan, an alarm output module, a buzzer, an external expansion display and the like;
s5, performing protection detection on system equipment, wherein in the embodiment, the equipment protection detection comprises overvoltage detection, undervoltage detection, bus overcurrent detection, output current limiting detection, overcurrent protection detection and the like;
s6, judging whether a command of the control system is effective or not, if so, selecting and entering a corresponding working mode for working, and if not, returning to a state; in the embodiment of the invention, the working modules of the system comprise an undervoltage unit operation mode, an overvoltage current limiting operation mode, a constant power operation mode, an output current limiting operation mode and the like; the working modes of the system are automatically adjusted according to the working state, the load and the condition of the power grid of the current equipment;
s7, detecting whether the load is normal, entering an equipment running state if the load is normal, and returning to a standby state if the load is not normal;
s8, after the system enters the equipment running state, tracking the resonance frequency of the load in real time by using an all-digital phase locking technology, and enabling the working frequency of the system to be always controlled on the resonance frequency of the load, so that the system is ensured to run in the efficient working state. The full digital phase locking technology is utilized to ensure that the system operates in a high-efficiency state of the soft switch, and the resonant frequency of the load can be automatically tracked in real time, so that the working frequency of the system always works on the resonant frequency of the load (namely, the working frequency of the system is the same or basically the same as the working frequency of the load), and the full digital phase locking technology is utilized to automatically track the resonant frequency of the load in real time.
The specific flowchart of the control method according to the embodiment of the present invention may refer to fig. 2.
As a preferred embodiment, the step S8 further includes: carrying out parameter identification on the induction coil and the induction coil in the load module by utilizing a dynamic inductance value identification technology so as to search out the working frequency which can enable the system to work in an efficient running state; the system also utilizes a dynamic inductance value identification technology, identifies the material of the load, and automatically adjusts the heating state of the system according to the identified material (such as iron, stainless steel or aluminum material) so as to enable the system to work in an efficient running state. By utilizing the dynamic inductance value identification technology, the most efficient working frequency of the system can be accurately and intelligently searched.
In addition, preferably, in the embodiment of the present invention, the step S8 further includes: in the running state of the system, a fuzzy control technology is adopted, and the voltage, the current and the power of the system are pre-calculated in a closed loop in real time by simultaneously acting based on PWM+PFM pulse width modulation and frequency modulation, so that the system is in a running state with constant output power.
According to the full-digital induction heating power supply control system and the full-digital induction heating power supply control method, the resonant frequency of the load is tracked in real time by utilizing the full-digital phase locking technology, so that the working frequency of the system can be always controlled on the resonant frequency of the load, and the system is ensured to operate in a high-efficiency working state; the system utilizes a dynamic inductance value identification technology to identify parameters of the induction coil and the induction coil in the load module so as to search out the working frequency which can enable the system to work in an efficient running state; the system also utilizes a dynamic inductance value identification technology, identifies the material of the load, and automatically adjusts the heating state of the system according to the identified material so that the system works in an efficient running state; in addition, the system also adopts a fuzzy control technology, and performs closed-loop pre-operation on the voltage, current and power of the system in real time by simultaneously acting based on PWM+PFM pulse width modulation and frequency modulation, so that the system is in a running state with constant output power.
The above embodiments are preferred embodiments of the present invention, and are not intended to limit the present invention, and any obvious substitutions are within the scope of the present invention without departing from the inventive concept of the present invention.
Claims (10)
1. The utility model provides a full digital induction heating power control system which characterized in that: the system comprises a rectifying and filtering circuit, a full-bridge inverter circuit, an induction coil and a load module which are sequentially connected, wherein the rectifying and filtering circuit is used for being connected with a power supply module, the system further comprises a digital signal processing unit and a microcontroller processing unit which are mutually connected, a voltage signal and a current signal of an output end of the rectifying and filtering circuit are fed back to the digital signal processing unit, and a current signal of an output end of the full-bridge inverter circuit is fed back to the digital signal processing unit; the digital signal processing unit is connected with an operation panel, a display module and a communication module; the microcontroller processing unit is connected with a temperature sensor module, an analog quantity control module and a soft start and automatic preheating control module.
2. The all-digital induction heating power control system of claim 1, wherein: and the microcontroller processing unit is also connected with a fan and a fault alarm output module.
3. The all-digital induction heating power control system of claim 2, wherein: and the microcontroller processing unit is also connected with a buzzer and an expansion display.
4. The all-digital induction heating power control system of claim 1, wherein: the full-bridge inverter circuit is an IGBTH bridge full-bridge inverter circuit.
5. The all-digital induction heating power control system according to any one of claims 1 to 4, characterized in that: the temperature sensor module is a thermistor temperature sensor.
6. The all-digital induction heating power control system of claim 5, wherein: the communication module is a 485 communication module.
7. A control method of an all-digital induction heating power supply control system, characterized in that the control method is applied to the all-digital induction heating power supply control system according to any one of claims 1 to 6, and the control method steps include: s1, powering up the system, and loading system data after the system completes hardware initialization; s2, after the data is loaded successfully, after the system enters a standby state, updating various display contents required for a human-computer interface; s3, acquiring communication information in the operation panel and the communication module; s4, controlling peripheral equipment of the system; s5, performing protection detection on system equipment; s6, judging whether a command of the control system is effective or not, if so, selecting and entering a corresponding working mode for working, and if not, returning to a state; s7, detecting whether the load is normal, entering an equipment running state if the load is normal, and returning to a standby state if the load is not normal; s8, after the system enters the equipment running state, tracking the resonance frequency of the load in real time by using an all-digital phase locking technology, and enabling the working frequency of the system to be always controlled on the resonance frequency of the load, so that the system is ensured to run in the efficient working state.
8. The control method according to claim 7, characterized in that said step S8 further comprises: and carrying out parameter identification on the induction coils and the induction coils in the load module by utilizing a dynamic inductance value identification technology so as to search out the working frequency which can enable the system to work in an efficient running state.
9. The control method according to claim 8, characterized in that said step S8 further comprises: the system utilizes a dynamic inductance value identification technology, identifies the material of the load, and automatically adjusts the heating state of the system according to the identified material, so that the system works in an efficient running state.
10. The control method according to any one of claims 7 to 9, characterized in that the step S8 further includes: in the running state of the system, a fuzzy control technology is adopted, and the voltage, the current and the power of the system are pre-calculated in a closed loop in real time by simultaneously acting based on PWM+PFM pulse width modulation and frequency modulation, so that the system is in a running state with constant output power.
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| CN201810298198.4A CN108495395B (en) | 2018-04-04 | 2018-04-04 | All-digital induction heating power supply control system and control method |
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| CN201810298198.4A CN108495395B (en) | 2018-04-04 | 2018-04-04 | All-digital induction heating power supply control system and control method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7308460A (en) * | 1972-06-16 | 1973-12-18 | ||
| JPH05213505A (en) * | 1992-02-04 | 1993-08-24 | Yaskawa Electric Corp | Roller drive control method |
| CN201584935U (en) * | 2009-07-02 | 2010-09-15 | 陕西科技大学 | High-voltage motor soft-start device based on PLC |
| CN101965072A (en) * | 2009-07-22 | 2011-02-02 | 深圳市阿尔法变频技术有限公司 | Full digital electromagnetic heater |
| CN107135564A (en) * | 2017-07-02 | 2017-09-05 | 中国计量大学 | A kind of pulsed induction heating power of the digital frequency-tracking of modified |
| CN208572475U (en) * | 2018-04-04 | 2019-03-01 | 东莞合拓电子科技有限公司 | A kind of digital induction heating power control system |
-
2018
- 2018-04-04 CN CN201810298198.4A patent/CN108495395B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7308460A (en) * | 1972-06-16 | 1973-12-18 | ||
| JPH05213505A (en) * | 1992-02-04 | 1993-08-24 | Yaskawa Electric Corp | Roller drive control method |
| CN201584935U (en) * | 2009-07-02 | 2010-09-15 | 陕西科技大学 | High-voltage motor soft-start device based on PLC |
| CN101965072A (en) * | 2009-07-22 | 2011-02-02 | 深圳市阿尔法变频技术有限公司 | Full digital electromagnetic heater |
| CN107135564A (en) * | 2017-07-02 | 2017-09-05 | 中国计量大学 | A kind of pulsed induction heating power of the digital frequency-tracking of modified |
| CN208572475U (en) * | 2018-04-04 | 2019-03-01 | 东莞合拓电子科技有限公司 | A kind of digital induction heating power control system |
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| CN108495395A (en) | 2018-09-04 |
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