CN111479345A - Frequency tracking and adjusting system and method for induction heating - Google Patents
Frequency tracking and adjusting system and method for induction heating Download PDFInfo
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Abstract
The embodiment of the invention provides a frequency tracking and adjusting system and method for induction heating, wherein the system comprises the following components: the device comprises a voltage waveform collector, a current waveform collector, an FPGA module, a precision clock, a DSP processor and a PMW control circuit; the voltage waveform collector is used for collecting a voltage switching waveform of the induction heating circuit; the current waveform collector is used for collecting the current waveform of the induction heating circuit; the FPGA module is used for receiving the voltage switching waveform and the current waveform, when the rising edge of T1 of the voltage switching waveform arrives, the FPGA module is provided with a counter and sends a new PMW control frequency omega to the PWM control circuit, the PWM control circuit controls the heating circuit to heat according to the new PMW control frequency omega, and the DSP processor records the new PMW control frequency omega to continuously repeat the steps, so that real-time frequency tracking can be realized, the problem of deviation of a resonance point caused by load change is solved, the efficiency of induction heating is reduced, and efficient induction heating is realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of digital heating, in particular to a frequency tracking and adjusting system and method for induction heating.
Background
Modern induction heating is a method which basically utilizes inductance in a resonant circuit to form an alternating electromagnetic field, then forms eddy current and hysteresis on a workpiece and then generates heat,
However, as heating progresses, the impedance also changes, and how to provide a matched power supply frequency becomes a challenge.
Therefore, the technical problem to be solved by the skilled person is how to provide a frequency tracking and adjusting scheme for induction heating, which can solve the problem of impedance matching along with the progress of heating, and achieve the power frequency acquisition and follow-up response tracking of induction heating.
Disclosure of Invention
Therefore, the embodiment of the invention provides a frequency tracking and adjusting system and method for induction heating, which can solve the problem of impedance matching along with the progress of heating and realize the acquisition of power supply frequency of induction heating and the tracking of follow-up response.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
In a first aspect, an embodiment of the present invention provides a frequency tracking adjustment system for induction heating, including:
The device comprises a voltage waveform collector, a current waveform collector, an FPGA module, a precision clock, a DSP processor and a PMW control circuit;
The voltage waveform collector is used for collecting a voltage switching waveform of the induction heating circuit;
The current waveform collector is used for collecting the current waveform of the induction heating circuit;
the FPGA module is used for receiving the voltage switching waveform and the current waveform, when a rising edge T1 of the voltage switching waveform comes, the FPGA module is provided with a counter which is connected with the precision clock and starts to count pulses till the end of the rising edge T3, when the rising edge T2 comes, the FPGA is internally provided with the counter and starts to insert the counting pulses till the end of the rising edge T3, and the time from T1 to T3 is calculated according to the period of the counting pulses, wherein T1-3 is equal to the period time of the T counting pulse multiplied by n1-3, and the time from the rising edge T2 to the rising edge T3 is T2-3 is equal to the period time of the T counting pulse multiplied by n 2-3;
The rising edge of the T1 is the time when the first voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of the T2 is the time when the second voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of T3 is the time when the first voltage of the current switching waveform changes from low to high when the equipment is powered on;
The DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module;
If t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3At ≦ T0/2, the PMW control period T0 is modified to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2;
And sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor.
Preferably, the induction heating circuit includes: the thyristor comprises a first thyristor, a second thyristor, a third thyristor and a fourth thyristor;
The first thyristor and the second thyristor are connected in series at a point A, and the third thyristor and the fourth thyristor are connected in series at a point B.
Preferably, the point A is connected to the point B through a heater, a compensation capacitor and an equivalent resistor in sequence;
And the input end of the current waveform collector is connected to the connection point of the compensation capacitor and the equivalent capacitor.
Preferably, the point A is connected to the point B through a first resistor R1 and a second resistor R2 in sequence;
The input end of the voltage waveform collector is connected to the connection point of the first resistor R1 and the second resistor R2.
Preferably, when the equipment is powered on, the inductance of the heater and the capacitance of the compensation capacitor are input into the DSP processor through a human-computer interface and are utilized 
L C natural resonant frequency omega is calculated Setting up The DSP processor gives omega of the resonant frequency through the PWM control circuit 0＝75％×ωSetting up The frequency gives the PWM wave period frequency, the period time is T0, or a DSP processor records the original working frequency, so that the inverter works.
In a second aspect, an embodiment of the present invention provides a frequency tracking adjustment method for induction heating, which is applied to the frequency tracking adjustment system according to any one of the above first aspects, and includes:
receiving the voltage switching waveform and the current waveform, when a rising edge of T1 of the voltage switching waveform arrives, the FPGA module is provided with a counter which is connected with the precision clock and starts to count pulses until the rising edge of T3 is finished, when the rising edge of T2 arrives, the FPGA is internally provided with the counter and starts to insert the counting pulses until the rising edge of T3 is finished, and the time from T1 to T3 is calculated according to the period of the counting pulses, wherein T1-3 is equal to the T counting pulse period time × n1-3, and T2 is equal to the time from the rising edge of T3, and T2-3 is equal to the T counting pulse period time × n 2-3;
The rising edge of the T1 is the time when the first voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of the T2 is the time when the second voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of T3 is the time when the first voltage of the current switching waveform changes from low to high when the equipment is powered on;
The DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module;
If t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3At ≦ T0/2, the PMW control period T0 is modified to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2;
And sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor.
the embodiment of the invention provides an induction heating frequency tracking and adjusting system which comprises a voltage waveform collector, a current waveform collector, an FPGA module, a precision clock, a DSP (digital signal processor) and a PMW (programmable pulse width modulation) control circuit, wherein the voltage waveform collector is used for collecting a voltage switching waveform of an induction heating circuit, the current waveform collector is used for collecting a current waveform of the induction heating circuit, the FPGA module is used for receiving the voltage switching waveform and the current waveform, when a T1 rising edge of the voltage switching waveform comes, the FPGA module is provided with a counter which is connected with the precision clock and starts counting pulses till the T3 rising edge ends, when a T2 rising edge comes, the FPGA built-in counter starts to insert counting pulses till the T3 rising edge ends, the time from T1 to T3 according to the period of the counting pulses, T1-3 is the T counting pulse period × n1-3, the time from the T2 rising edge to the T3 rising edge, T2-3 is the time from the T2-3 when the T pulse counting period is multiplied by the T3825-3, wherein the first rising edge of the T73784 voltage switching waveform when the first rising voltage switching waveform comes, the first rising edge of the T3 rising voltage switching waveform is changed from the high voltage, and the second rising voltage is changed from the first rising edge of the second rising edge of the T3, the second rising edge of the second The time of day; the DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module; if t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3At ≦ T0/2, the PMW control period T0 is modified to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2; and sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor. And 10, continuously repeating the steps to realize real-time frequency tracking, solving the deviation of resonance points caused by load change, reducing the efficiency of induction heating and realizing high-efficiency induction heating.
The frequency tracking and adjusting method for induction heating provided by the embodiments of the present invention also has the above beneficial effects, which are not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic structural diagram of a frequency tracking adjustment system for induction heating according to an embodiment of the present invention;
FIG. 2 is a schematic voltage rise diagram of an induction heating frequency tracking regulation system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the current rise of an induction heating frequency tracking regulation system according to an embodiment of the present invention;
Fig. 4 is a schematic diagram illustrating a waveform analysis of a frequency tracking adjustment system for induction heating according to an embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a frequency tracking and adjusting system for induction heating according to an embodiment of the present invention; FIG. 2 is a schematic voltage rise diagram of an induction heating frequency tracking regulation system according to an embodiment of the present invention; FIG. 3 is a schematic diagram of the current rise of an induction heating frequency tracking regulation system according to an embodiment of the present invention; fig. 4 is a schematic diagram illustrating a waveform analysis of a frequency tracking adjustment system for induction heating according to an embodiment of the present invention.
In an embodiment of the present invention, an induction heating frequency tracking adjustment system includes:
The device comprises a voltage waveform collector, a current waveform collector, an FPGA module, a precision clock, a DSP processor and a PMW control circuit;
The voltage waveform collector is used for collecting a voltage switching waveform of the induction heating circuit;
The current waveform collector is used for collecting the current waveform of the induction heating circuit;
the FPGA module is used for receiving the voltage switching waveform and the current waveform, when a rising edge T1 of the voltage switching waveform comes, the FPGA module is provided with a counter which is connected with the precision clock and starts to count pulses till the end of the rising edge T3, when the rising edge T2 comes, the FPGA is internally provided with the counter and starts to insert the counting pulses till the end of the rising edge T3, and the time from T1 to T3 is calculated according to the period of the counting pulses, wherein T1-3 is equal to the period time of the T counting pulse multiplied by n1-3, and the time from the rising edge T2 to the rising edge T3 is T2-3 is equal to the period time of the T counting pulse multiplied by n 2-3;
The rising edge of the T1 is the time when the first voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of the T2 is the time when the second voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of T3 is the time when the first voltage of the current switching waveform changes from low to high when the equipment is powered on;
The DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module;
If t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3At ≦ T0/2, the PMW control period T0 is modified to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2;
And sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor.
Preferably, the induction heating circuit includes: the thyristor comprises a first thyristor, a second thyristor, a third thyristor and a fourth thyristor;
The first thyristor and the second thyristor are connected in series at a point A, and the third thyristor and the fourth thyristor are connected in series at a point B.
Preferably, the point A is connected to the point B through a heater, a compensation capacitor and an equivalent resistor in sequence;
And the input end of the current waveform collector is connected to the connection point of the compensation capacitor and the equivalent capacitor.
Preferably, the point A is connected to the point B through a first resistor R1 and a second resistor R2 in sequence;
The input end of the voltage waveform collector is connected to the connection point of the first resistor R1 and the second resistor R2.
Preferably, when the equipment is powered on, the inductance of the heater and the capacitance of the compensation capacitor are input into the DSP processor through a human-computer interface and are utilized 
L C natural resonant frequency omega is calculated Setting up The DSP processor gives omega of the resonant frequency through the PWM control circuit 0＝75％×ωSetting up The frequency gives the PWM wave period frequency, the period time is T0, or a DSP processor records the original working frequency, so that the inverter works.
That is, the inductance of the heater and the capacitance of the compensation capacitor are predicted and input to the DSP through the human-computer interface, and then utilized 
the method comprises the steps of calculating inherent resonant frequency omega of about L C, enabling a DSP to give PWM wave period frequency through setting frequency of 75% multiplied by omega, giving PWM wave period frequency through a control circuit, enabling the DSP to give PWM wave period frequency with period time of T0, or enabling the DSP to record original working frequency to enable an inverter to work, enabling a voltage waveform collector to collect UAB voltage switching waveforms through resistors R1 and R2 through high-speed optical coupler-voltage and collect rising edge waveforms at T1 and T2, enabling a current waveform collector to collect IAB current waveforms flowing through an L C loop through a high-speed optical coupler-current through a high-frequency current sensor and collect rising edge waveforms at T3, and inputting the IAB current waveforms into an FPGA together.
In another embodiment of the present invention, an embodiment of the present invention provides a frequency tracking adjustment method for induction heating, which is applied to the frequency tracking adjustment system as described in any embodiment of the first aspect, and includes:
receiving the voltage switching waveform and the current waveform, when a rising edge of T1 of the voltage switching waveform arrives, the FPGA module is provided with a counter which is connected with the precision clock and starts to count pulses until the rising edge of T3 is finished, when the rising edge of T2 arrives, the FPGA is internally provided with the counter and starts to insert the counting pulses until the rising edge of T3 is finished, and the time from T1 to T3 is calculated according to the period of the counting pulses, wherein T1-3 is equal to the T counting pulse period time × n1-3, and T2 is equal to the time from the rising edge of T3, and T2-3 is equal to the T counting pulse period time × n 2-3;
The rising edge of the T1 is the time when the first voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of the T2 is the time when the second voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of T3 is the time when the first voltage of the current switching waveform changes from low to high when the equipment is powered on;
The DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module;
If t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3≦T0/2, the PMW control period T0 is corrected to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2;
And sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. An induction heated frequency tracking regulation system, comprising:
The device comprises a voltage waveform collector, a current waveform collector, an FPGA module, a precision clock, a DSP processor and a PMW control circuit;
The voltage waveform collector is used for collecting a voltage switching waveform of the induction heating circuit;
The current waveform collector is used for collecting the current waveform of the induction heating circuit;
the FPGA module is used for receiving the voltage switching waveform and the current waveform, when a rising edge T1 of the voltage switching waveform comes, the FPGA module is provided with a counter which is connected with the precision clock and starts to count pulses till the end of the rising edge T3, when the rising edge T2 comes, the FPGA is internally provided with the counter and starts to insert the counting pulses till the end of the rising edge T3, and the time from T1 to T3 is calculated according to the period of the counting pulses, wherein T1-3 is equal to the period time of the T counting pulse multiplied by n1-3, and the time from the rising edge T2 to the rising edge T3 is T2-3 is equal to the period time of the T counting pulse multiplied by n 2-3;
The rising edge of the T1 is the time when the first voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of the T2 is the time when the second voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of T3 is the time when the first voltage of the current switching waveform changes from low to high when the equipment is powered on;
The DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module; if t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3At ≦ T0/2, the PMW control period T0 is modified to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2;
And sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor.
2. Frequency tracking adjustment system according to claim 1,
The induction heating circuit includes: the thyristor comprises a first thyristor, a second thyristor, a third thyristor and a fourth thyristor;
The first thyristor and the second thyristor are connected in series at a point A, and the third thyristor and the fourth thyristor are connected in series at a point B.
3. Frequency tracking adjustment system according to claim 2,
The point A is connected to the point B through a heater, a compensation capacitor and an equivalent resistor in sequence;
And the input end of the current waveform collector is connected to the connection point of the compensation capacitor and the equivalent capacitor.
4. Frequency tracking adjustment system according to claim 2,
The point A is connected to the point B through a first resistor R1 and a second resistor R2 in sequence;
The input end of the voltage waveform collector is connected to the connection point of the first resistor R1 and the second resistor R2.
5. Frequency tracking adjustment system according to any one of claims 1 to 4,
When the equipment is powered on, the inductance of the heater and the capacitance of the compensating capacitor are input into the DSP processor through the human-computer interface and utilized 
L C natural resonant frequency omega is calculated Setting up The DSP processor gives omega of the resonant frequency through the PWM control circuit 0＝75％×ωSetting up The frequency gives the PWM wave period frequency, the period time is T0, or a DSP processor records the original working frequency, so that the inverter works.
6. A frequency tracking adjustment method of induction heating, applied to the frequency tracking adjustment system according to any one of claims 1 to 5, comprising:
receiving the voltage switching waveform and the current waveform, when a rising edge of T1 of the voltage switching waveform arrives, the FPGA module is provided with a counter which is connected with the precision clock and starts to count pulses until the rising edge of T3 is finished, when the rising edge of T2 arrives, the FPGA is internally provided with the counter and starts to insert the counting pulses until the rising edge of T3 is finished, and the time from T1 to T3 is calculated according to the period of the counting pulses, wherein T1-3 is equal to the T counting pulse period time × n1-3, and T2 is equal to the time from the rising edge of T3, and T2-3 is equal to the T counting pulse period time × n 2-3;
The rising edge of the T1 is the time when the first voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of the T2 is the time when the second voltage of the voltage switching waveform changes from low to high when the equipment is powered on; the rising edge of T3 is the time when the first voltage of the current switching waveform changes from low to high when the equipment is powered on;
The DSP processor is used for receiving the t1-3 and the t2-3 calculated by the FPGA module;
If t 1-3-tDead time of bridge arm ≦t2-3And t is 1-3≧t2-3Then get t 2-3The time of (d);
If t 2-3At ≦ T0/2, the PMW control period T0 is modified to: t is new＝T0+t2-3Giving a new PWM frequency: 
If t 2-3≧ T0/2, the PMW control period T0 is corrected to: t is new＝t2-3Giving a new PWM frequency: 
Giving a new PWM working frequency omega according to omega 1 or omega 2;
And sending a new PMW control frequency omega to the PWM control circuit, controlling the heating circuit to heat by the PWM control circuit according to the new PMW control frequency omega, and recording the new PMW control frequency omega by the DSP processor.
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| 杨宗璞;宋书中;马建伟;朱锦洪;: "感应加热电源频率跟踪控制的研究", 电源技术, no. 12, 20 December 2010 (2010-12-20) * |
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