CN113316278B - A adjustable power induction heating electrical power generating system for graphite reation kettle heats - Google Patents
A adjustable power induction heating electrical power generating system for graphite reation kettle heats Download PDFInfo
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- CN113316278B CN113316278B CN202110567742.2A CN202110567742A CN113316278B CN 113316278 B CN113316278 B CN 113316278B CN 202110567742 A CN202110567742 A CN 202110567742A CN 113316278 B CN113316278 B CN 113316278B
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an adjustable power induction heating power supply system for heating a graphite reaction kettle, which mainly comprises four parts of rectification, inversion, a resonant circuit and a main control board, wherein a direct-current side adopts a three-phase uncontrolled rectification technology, and an inversion side adopts a single-phase full-bridge square wave inversion technology and a power adjustment scheme of frequency shift and power adjustment; the resonant circuit adopts a series resonant topological structure isolated by a self-coupling transformer; the main control board takes a DSP chip as a core to mainly complete four functions, namely 1) an AD acquisition part, current, voltage, temperature and other data acquisition, 2) PWM waveform generation, generation of full-bridge square wave inversion PWM signals with certain frequency, realization of driving of two IGBT modules through an IGBT driving board, realization of the full-bridge square wave inversion function, 3) realization of a control algorithm, realization of a power PID closed-loop control algorithm, a temperature hysteresis comparison algorithm and the like, 4) an interface circuit, and completion of acquisition of panel key actions, control of contactor actions and the like through an IO port.
Description
Technical Field
The invention belongs to the technical field of power supply of power systems, and particularly relates to an adjustable power induction heating power supply system for heating a graphite reaction kettle.
Background
At present, a resistance wire heating power supply is used for heating the graphite reaction kettle. The resistance wire heating power supply mainly makes the resistance wire into a heating plate or a heating ring to enable the resistance wire to be clung to the reaction kettle and transfer heat energy in a heat conduction mode. The resistance heating power supply has the characteristics of low heating efficiency, long preheating time, low constant temperature precision, easy damage of the heating wire and the like, and does not have the large-scale application condition of the industrial field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an adjustable power induction heating power supply system for heating a graphite reaction kettle, which utilizes an electromagnetic induction heating principle, realizes continuous adjustable power supply output power in a certain range through a closed-loop control algorithm of frequency modulation and power adjustment, and utilizes a non-contact infrared temperature sensor and a hysteresis comparison algorithm to accurately control the heating temperature of the graphite reaction kettle by adjusting the power supply output power according to a temperature threshold.
The invention is realized by the following technical scheme:
an adjustable power induction heating power supply system for heating a graphite reaction kettle comprises a three-phase rectifier bridge module, an inversion module, a resonant circuit and a main control board;
the input side of the three-phase rectifier bridge module is connected with three-phase 380V alternating current, the direct current output side is connected with a DC rectifying and filtering capacitor assembly, a contactor is arranged on a connecting circuit between the three-phase rectifier bridge module and the DC rectifying and filtering capacitor assembly and used for controlling the on-off of a circuit, and a bypass with a pre-charging resistor is arranged in parallel on the connecting circuit between the three-phase rectifier bridge module and the DC rectifying and filtering capacitor assembly, and when the contactor is disconnected, the bypass can be conducted;
the output end of the DC rectifying filter capacitor component is connected with the input side of the inversion module, and the inversion output side of the inversion module is connected with the resonant circuit;
the resonant circuit comprises a self-coupling transformer, an AC blocking capacitor assembly, a resonant capacitor assembly and a resonant induction coil, wherein the inversion output side of the inversion module is connected with the input side of the self-coupling transformer, and the AC blocking capacitor assembly is arranged between the inversion module and the self-coupling transformer; the output side of the self-coupling transformer is connected with a resonance induction coil on the barrel-shaped graphite reaction kettle, and a resonance capacitor assembly is arranged between the self-coupling transformer and the resonance induction coil;
the main control board takes a DSP chip as a core, and is provided with a relay output interface, a direct-current voltage acquisition interface, a PWM driving output interface, an intermediate-frequency current acquisition and shaping interface, a temperature detection interface, an RS485 communication port and an IO interface for connecting a panel switch, wherein the relay output interface is connected with a contactor; the direct-current voltage acquisition interface is connected with two output ends of the DC rectifying and filtering capacitor assembly and is used for acquiring the direct-current bus voltages at two ends of the DC rectifying and filtering capacitor assembly; the PWM driving output interface is connected with an IGBT driving plate which is connected to the inversion module; the intermediate frequency current collection and shaping interface is connected with a current sensor at the output side of the inversion module; the temperature detection interface is connected with a temperature detection unit for detecting the temperature of the graphite reaction kettle; and the RS485 communication port is connected with the touch screen, so that man-machine interaction is realized.
In the above technical scheme, the three-phase rectifier bridge module adopts an MDS400A1600V type three-phase rectifier bridge module.
In the technical scheme, the inversion module adopts a single-phase full-bridge inversion assembly consisting of Indeluxe FF450R12KT 4IGBT modules.
In the technical scheme, the model of the DC rectifying filter capacitor component is 9400 mu F/800V.
In the technical scheme, the type of the contactor is CJX2-95.
In the technical scheme, the touch screen model is mcgsTPC7062Ti.
In the technical scheme, the temperature detection unit adopts the DT8012B non-contact infrared temperature sensor and the XMT606 type detection instrument, the DT8012B non-contact infrared temperature sensor is aligned to the middle part of the outer wall of the graphite reaction kettle, detection signals are transmitted to the detection instrument, and the detection instrument is connected with the temperature detection interface of the main control board.
In the technical scheme, the model of the DSP chip on the main control board is TMS320F28335.
In the technical scheme, the inversion module, the resonant capacitor assembly, the resonant induction coil, the autotransformer and other assemblies are cooled by adopting a cooling water circulation system.
The working method of the system is as follows:
when the induction heating power supply is electrified, three-phase 380V alternating current is subjected to three-phase full-bridge rectification by the three-phase rectifier bridge module and is pre-charged for the DC rectifying filter capacitor assembly through a bypass with a pre-charging resistor, so that damage to the three-phase rectifier bridge module caused by excessive charging current in the moment of electrification is prevented, the main control board carries out analog-to-digital conversion through the direct current voltage acquisition interface and the AD conversion module integrated on the DSP main chip, the direct current bus voltage at two ends of the DC rectifying filter capacitor assembly is monitored, the main control board controls the contactor to be attracted through the relay output interface when the bus voltage rises to about 500V, the bus voltage is charged to about 540V, the bus charging is completed, and the electrification process of the induction heating power supply is completed.
After the power-on is finished, the upper limit frequency and the lower limit frequency of the scanning frequency of the induction heating power supply are set through the touch screen, the power output power is set, after the main control board detects the action of the starting button through the IO interface, the main control board outputs four paths of driving control signals to the two IGBT driving boards through the integrated PWM controller on the DSP chip to generate four paths of IGBT driving signals, four IGBT switches of the two IGBT modules in the inversion module are controlled to be sequentially turned on and off to carry out single-phase full-bridge square wave inversion at the upper limit frequency of the scanning frequency, the main control board carries out real-time acquisition on amplitude and phase angle of the square wave inversion output intermediate frequency current and voltage through the integrated ADC module on the intermediate frequency current and voltage acquisition port and the DSP chip and the timer, the output power and the set power difference value are calculated, and the DSP chip controls the driving pulse frequency according to the power difference value, and continuously reduces the output power difference value to enable the output power to be set value.
The power supply heats the graphite reaction kettle with set power, the main control board collects temperature values through the temperature collection interface and an ADC module integrated on the DSP chip, the collected temperature values are compared with set upper temperature limit, when the temperature does not reach the upper limit value, the power supply continuously heats the graphite reaction kettle with set power value, when the collected temperature values are larger than the upper temperature limit value, the DSP chip sets the power set value to 60% of the original set power value, so that the power supply continuously operates with low power, the temperature of the graphite reaction kettle is maintained, when the collected temperature values are lower than the lower temperature limit, the controller sets the power set value to the original set power value, and the power supply continuously operates with high power to heat the graphite reaction kettle.
The invention has the advantages and beneficial effects that:
the invention utilizes the electromagnetic induction heating principle, realizes continuous adjustment of the output power of the power supply within a certain range through a closed-loop control algorithm of frequency modulation and power adjustment, and utilizes a non-contact infrared temperature sensor and a hysteresis comparison algorithm to accurately control the heating temperature of the graphite reaction kettle by adjusting the output power of the power supply according to a temperature threshold. Has the advantages of stability, reliability, high efficiency, convenient industrialized application and the like. The continuous adjustment of the output power of 20 kw-100 kw can be realized; when the output power is set to be 50kw, the effect of heating the graphite reaction kettle to 700 ℃ for 30 minutes can be realized, and the constant temperature is 690 ℃ to 710 ℃.
Drawings
FIG. 1 is a schematic diagram of a system principle;
FIG. 2 is a flow chart of a system control procedure;
FIG. 3 is a flow chart of a temperature control subroutine;
FIG. 4 is a flow chart of a PID power adjustment subroutine.
In the figure:
1 is a three-phase rectifier bridge module;
2 is a precharge resistor;
3 is a contactor;
4 is a DC rectifying filter capacitor component;
5 is an inversion module;
6 is an AC dc blocking capacitor assembly;
7 is a current sensor;
8 is a self-coupling transformer;
9 is an AC resonance capacitor assembly;
10 is a graphite reaction kettle;
11 is a resonance induction coil;
12 is a non-contact infrared temperature sensor;
13 is a detection instrument;
14 is an IGBT driving plate;
15 is a main control board;
16 is a panel switch;
and 17 is a touch screen.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the person skilled in the art better understand the solution of the present invention, the following describes the solution of the present invention with reference to specific embodiments.
Example 1
An adjustable power induction heating power supply system for heating a graphite reaction kettle comprises a three-phase rectifier bridge module, an inversion module, a resonant circuit and a main control board.
The three-phase rectifier bridge module 1 adopts an MDS400A1600V type three-phase rectifier bridge module, the input side of the three-phase rectifier bridge module is connected with three-phase 380V alternating current, the direct current output side of the MDS400A1600V type three-phase rectifier bridge module is connected with a DC rectifying and filtering capacitor assembly 4, a contactor 3 is arranged on a connecting circuit between the three-phase rectifier bridge module and the DC rectifying and filtering capacitor assembly 4 and used for controlling the on-off of a circuit, and a bypass with a precharge resistor 2 is arranged on the connecting circuit between the three-phase rectifier bridge module and the DC rectifying and filtering capacitor assembly 4 in parallel, and when the contactor 3 is disconnected, the bypass can be conducted.
The output end of the DC rectifying filter capacitor component 4 is connected with the input side of the inversion module 5, the inversion module adopts a single-phase full-bridge inversion component formed by Infram FF450R12KT 4IGBT modules, and the output side of the inversion module 5 is connected with a resonant circuit.
The resonant circuit adopts a series resonant topological structure isolated by a self-coupling transformer, and specifically comprises a self-coupling transformer 8 (200 kVA turn ratio is 2:1), an AC blocking capacitor assembly 6, a resonant capacitor assembly 9 and a resonant induction coil 11, wherein the output side of an inverter module 5 is connected with the input side of the self-coupling transformer 8, and the AC blocking capacitor assembly 6 is arranged between the inverter module 5 and the self-coupling transformer 8; the output side of the autotransformer 8 is connected with a resonance induction coil 11 on a barrel-shaped graphite reaction kettle 10, and a resonance capacitor assembly 9 is arranged between the autotransformer 8 and the resonance induction coil 11.
Further, the inverter module, the resonant capacitor assembly, the resonant induction coil, the autotransformer and other assemblies are cooled by adopting a cooling water circulation system.
The main control board 15 takes a DSP chip TMS320F28335 as a core, and is provided with a relay output interface, a direct-current voltage acquisition interface, a PWM driving output interface, an intermediate-frequency current acquisition and shaping interface, a temperature detection interface, an RS485 communication port and an IO interface for connecting a panel switch. Wherein the relay output interface is connected with the contactor 3; the direct-current voltage acquisition interface is connected with two output ends of the DC rectifying and filtering capacitor assembly 4 and is used for acquiring the direct-current bus voltages at two ends of the DC rectifying and filtering capacitor assembly 4; the PWM driving output interface is connected with an IGBT driving plate which is connected to the inversion module 5; the intermediate frequency current collection and shaping interface is connected with a current sensor 7 at the output side of the inversion module 5; the temperature detection interface is connected with a temperature detection unit (see fig. 1, the temperature detection unit adopts a DT8012B non-contact infrared temperature sensor 12 and an XMT606 type detection instrument 13, the DT8012B non-contact infrared temperature sensor 12 is aligned with the middle part of the outer wall of the graphite reaction kettle, a detection signal is transmitted to the detection instrument, and the detection instrument is connected with a temperature detection interface of the main control board 15); and the RS485 communication port is connected with the touch screen, so that man-machine interaction is realized.
The main control board 15 mainly completes four parts of functions: 1) AD acquisition, current, voltage, temperature and other data acquisition, 2) PWM waveform generation, generation of full-bridge square wave inversion PWM signals with certain frequency, realization of driving of two IGBT modules through an IGBT driving board, realization of full-bridge square wave inversion function, 3) realization of a control algorithm, realization of a power PID closed-loop control algorithm, a temperature hysteresis comparison algorithm and the like, 4) an interface circuit, and completion of panel key action acquisition, contactor action control and the like through an IO port.
The working principle of the system is as follows:
when the induction heating power supply is electrified, three-phase 380V alternating current is rectified by the three-phase rectifier bridge module 1 of the MDS400A1600V type, and is precharged by the DC rectifier filter capacitor assembly 4 of 9400 mu F/800V through the precharge resistor 2 of the RXG24-100W-500R type (when the induction heating power supply is precharged, the main control board 15 controls the CJX2-95 type contactor 3 to be in a disconnection state through the relay output interface, so that the bypass with the precharge resistor 2 is conducted), damage to the three-phase rectifier bridge module 1 caused by excessive charging current at the moment of electrification is prevented, the main control board 15 performs analog-to-digital conversion with the AD conversion module integrated on the TMS320F28335 of the DSP main chip through the DC voltage acquisition interface, the DC bus voltage at two ends of the DC rectifier filter capacitor assembly 4 of 9400 mu F/800V is monitored, when the bus voltage rises to about 500V, the main control board 15 controls the CJX2-95 type contactor 3 to be in a disconnection state through the relay output interface, and the charging bus is completed, and the induction heating power supply electrification process is completed.
The induction heating power supply adopts a power regulation mode of frequency modulation and power regulation, after the power on is finished, an upper limit frequency and a lower limit frequency of the scanning frequency of the induction heating power supply are set through the mcgsTPC7062Ti type touch screen 17, the output power of the power supply is set, and after the setting is finished, setting parameters are stored. After confirming that the cooling water circulation of the single-phase full-bridge inversion assembly, the resonance capacitor assembly 9, the 60 mu H resonance induction coil 11, the autotransformer and other assemblies formed by the Infrax FZ400R12KS4IGBT modules is normal and the system is free of other abnormalities, clicking a panel start button, detecting the action of the start button through an IO interface by the main control board 15, outputting four-way driving control signals to two IGBT driving boards through an integrated PWM controller on a DSP main chip TMS320F28335 to generate four-way IGBT driving signals by the main control board 15, controlling four IGBT switches in the two IGBT modules in the single-phase full-bridge inversion assembly 5 formed by the Infrax F450R12KT 4IGBT modules to be sequentially conducted and turned off to perform single-phase full-bridge square wave inversion at the upper limit frequency of scanning frequency, acquiring amplitude and phase angle of the intermediate-frequency inversion output intermediate-frequency current and voltage through an intermediate-frequency current and a timer on the main chip TMS320F28335, calculating the difference value of output power and setting power, and continuously reducing the output power difference value to the setting value by the DSP according to the power difference value.
The power supply heats the graphite reaction kettle with set power; the main control board 15 is connected with the DSP main chip TMS320F28335 through a temperature acquisition interface, an ADC module is integrated on the main chip TMS320F28335 to acquire an XMT606 type detection instrument 13 to output a temperature value, the acquired temperature value is compared with a temperature upper limit, when the temperature does not reach the upper limit value, the power supply continuously heats the graphite reaction kettle at a set power value, when the acquired temperature value is greater than the temperature upper limit value, the controller sets the power set value to 60% of an original set power value, so that the power supply continuously operates at low power to maintain the temperature of the graphite reaction kettle, and when the acquired temperature value is lower than the temperature lower limit, the controller sets the power set value to the original set power value, so that the power supply continuously operates at high power to heat the graphite reaction kettle.
Example two
Fig. 2 is a block diagram of a power closed loop system, in which heating induction output power is acquired in real time through a voltage and current sensor by an AD conversion module of a DSP, and compared with set power after calculation, the DSP controls the IGBT driving pulse frequency according to the power difference value, and continuously reduces the output power difference value to the set value.
FIG. 3 is a flowchart of a system control procedure, which includes the following steps:
s1: start to
S2: after the power is powered on, each peripheral function module of the DSP main control chip is initialized firstly
S3: the CRC check is successful, the configuration parameters of the touch screen transmission system are checked, the integrity of the data is verified, S5 is entered if the check is successful, and S4 is entered if the check is unsuccessful
S4: default parameter configuration and return, system using default parameter configuration
S5: user parameter configuration, configuration system using user-set parameters
S6: detecting whether the DC bus voltage of the system exceeds a threshold value or not by delaying 8 seconds after the DC voltage exceeds the threshold value, entering S7 if the detection passes, and entering S11 if the detection does not pass
S7: closed main loop contactor, which uses rectifier bridge to rectify and charge DC bus
S8: starting and state detection, wherein the system enters a standby state, detects a system starting signal and a system fault code, and enters S9 if the starting signal is detected and no fault code exists, otherwise, enters S8 and is in a standby state
S9: the frequency sweep starts, the system gradually increases the output inversion PWM frequency from the lower limit to the upper limit in the range of the set frequency, and simultaneously detects whether the inversion current exceeds the starting threshold current value, if yes, the system successfully enters S10, otherwise, the system enters S8
S10: changing the set value of the output frequency value, and changing the inversion PWM frequency to the set value of the user after the start is successful
S11: temperature regulation, and system power setting is carried out according to the set temperature
S12: PID power regulation, which changes PWM output frequency according to the power set by temperature regulation to perform power regulation
S13: detecting the stop and the state, detecting a stop signal and a fault code, entering S11 if the stop and the fault are not detected, otherwise entering S8
S14: start to
S15: judging whether the temperature of the graphite reaction kettle exceeds a set upper limit value, if so, entering S16, otherwise, entering S17
S16: setting the system power set value as the preset constant temperature maintaining power value
S17: judging whether the temperature of the graphite reaction kettle is lower than a set lower limit value, if so, entering S18, otherwise, entering S19
S18: setting the system power set point to a preset heating power value
S19: ending
S20: start to
S21: delta u (k) calculation of PID control algorithm increment formula
S22: modifying PWM register value according to calculated value, and changing output inversion PWM frequency
S23: ending
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. A adjustable power induction heating electrical power generating system for graphite reation kettle heats, its characterized in that: the device comprises a three-phase rectifier bridge module, an inversion module, a resonant circuit and a main control board;
the input side of the three-phase rectifier bridge module is connected with three-phase 380V alternating current, the direct current output side is connected with a DC rectifying and filtering capacitor assembly, a contactor is arranged on a connecting circuit between the three-phase rectifier bridge module and the DC rectifying and filtering capacitor assembly and used for controlling the on-off of a circuit, and a bypass with a pre-charging resistor is arranged in parallel on the connecting circuit between the three-phase rectifier bridge module and the DC rectifying and filtering capacitor assembly, and when the contactor is disconnected, the bypass can be conducted;
the output end of the DC rectifying filter capacitor component is connected with the input side of the inversion module, and the inversion output side of the inversion module is connected with the resonant circuit;
the resonant circuit comprises a self-coupling transformer, an AC blocking capacitor assembly, a resonant capacitor assembly and a resonant induction coil, wherein the inversion output side of the inversion module is connected with the input side of the self-coupling transformer, and the AC blocking capacitor assembly is arranged between the inversion module and the self-coupling transformer; the output side of the self-coupling transformer is connected with a resonance induction coil on the barrel-shaped graphite reaction kettle, and a resonance capacitor assembly is arranged between the self-coupling transformer and the resonance induction coil;
the main control board takes a DSP chip as a core, and is provided with a relay output interface, a direct-current voltage acquisition interface, a PWM driving output interface, an intermediate-frequency current acquisition and shaping interface, a temperature detection interface, an RS485 communication port and an IO interface for connecting a panel switch, wherein the relay output interface is connected with a contactor; the direct-current voltage acquisition interface is connected with two output ends of the DC rectifying and filtering capacitor assembly and is used for acquiring the direct-current bus voltages at two ends of the DC rectifying and filtering capacitor assembly; the PWM driving output interface is connected with an IGBT driving plate which is connected to the inversion module; the intermediate frequency current collection and shaping interface is connected with a current sensor at the output side of the inversion module; the temperature detection interface is connected with a temperature detection unit for detecting the temperature of the graphite reaction kettle; the RS485 communication port is connected with the touch screen, so that man-machine interaction is realized;
the operation method of the power-adjustable induction heating power supply system is as follows:
when the induction heating power supply is electrified, three-phase 380V alternating current is subjected to three-phase full-bridge rectification by the three-phase rectifier bridge module, and a bypass with a precharge resistor is used for precharging the DC rectifying filter capacitor assembly, so that damage to the three-phase rectifier bridge module caused by overlarge charging current at the moment of electrification is prevented, a main control board carries out analog-to-digital conversion with an integrated AD conversion module on a DSP main chip through a direct-current voltage acquisition interface, the direct-current bus voltage at two ends of the DC rectifying filter capacitor assembly is monitored, when the bus voltage rises to about 500V, the main control board controls a contactor to be attracted through a relay output interface, and when the bus voltage is charged to about 540V, the bus charging is completed, and the electrification process of the induction heating power supply is completed;
after the power-on is finished, the upper limit frequency and the lower limit frequency of the scanning frequency of the induction heating power supply are set through the touch screen, the power supply output power is set, after the main control board detects the action of the starting button through the IO interface, the main control board outputs four paths of driving control signals to the two IGBT driving boards through the integrated PWM controller on the DSP chip to generate four paths of IGBT driving signals, four IGBT switches of the two IGBT modules in the inversion module are controlled to be sequentially turned on and off so as to carry out single-phase full-bridge square wave inversion at the upper limit frequency of the scanning frequency, the main control board carries out amplitude and phase angle acquisition on the intermediate frequency current and voltage inversion output by the integrated ADC module on the DSP chip and the timer through the intermediate frequency current and voltage acquisition port, the output power and the set power difference value are calculated, and the DSP chip controls the driving pulse frequency according to the power difference value, and continuously reduces the output power difference value to enable the output power to be set value;
the power supply heats the graphite reaction kettle with set power, the main control board collects temperature values through the temperature collection interface and an ADC module integrated on the DSP chip, the collected temperature values are compared with set upper temperature limit, when the temperature does not reach the upper limit, the power supply continuously heats the graphite reaction kettle with set power values, when the collected temperature values are larger than the upper temperature limit, the DSP chip sets the power set values to 50-70% of the original set power values, so that the power supply continuously operates with low power, the temperature of the graphite reaction kettle is maintained, when the collected temperature values are lower than the lower temperature limit, the controller sets the power set values to the original set power values, so that the power supply continuously operates with high power to heat the graphite reaction kettle;
the working method of the adjustable power induction heating power supply system is as follows:
s1: starting;
s2: after the power supply is electrified, each peripheral function module is initialized to the DSP main control chip;
s3: the CRC check is successful, the configuration parameters of the touch screen transmission system are checked, the integrity of the data is verified, if the check is successful, the S5 is entered, and if the check is unsuccessful, the S4 is entered;
s4: default parameter configuration and return, wherein a default parameter configuration system is used;
s5: user parameter configuration, namely configuring a system by using user setting parameters;
s6: detecting whether the DC bus voltage of the system passes a threshold value or not by delaying for 8 seconds when the DC voltage passes the threshold value, entering S7 if the DC bus voltage passes the detection, and entering S11 if the DC bus voltage does not pass the detection;
s7: closing the main loop contactor, rectifying the closed contactor by using a rectifier bridge, and charging the direct current bus;
s8: starting and detecting the state, wherein the system enters a standby state, detects a system starting signal and a system fault code, and enters S9 if the starting signal is detected and the fault code is not available, otherwise, enters S8 and is in a standby state;
s9: the method comprises the steps that the frequency sweep is started, the system gradually increases the output inversion PWM frequency from the low limit to the high limit in a range of the set frequency, and meanwhile, whether the inversion current exceeds a starting threshold current value is detected, if yes, S10 is successfully carried out, and otherwise S8 is carried out;
s10: changing the set value of the output frequency value, and changing the inversion PWM frequency to the set value of the user after the start is successful;
s11: temperature regulation, and setting system power according to the set temperature;
s12: PID power regulation, namely changing PWM output frequency according to the power set by temperature regulation, and performing power regulation;
s13: detecting the shutdown and the state, detecting a shutdown signal and a fault code, entering S11 if the shutdown and the fault are not detected, otherwise entering S8;
s14: starting;
s15: judging whether the temperature of the graphite reaction kettle exceeds a set upper limit value, if so, entering S16, otherwise, entering S17;
s16: setting a system power set value as a preset constant temperature holding power value;
s17: judging whether the temperature of the graphite reaction kettle is lower than a set lower limit value, if so, entering S18, otherwise, entering S19;
s18: setting a system power set value as a preset heating power value;
s19: ending;
s20: starting;
s21: delta u (k) calculation of an increment formula of the PID control algorithm is carried out;
s22: modifying the PWM register value according to the calculated value, and modifying the output inversion PWM frequency;
s23: and (5) ending.
2. The adjustable power induction heating power supply system of claim 1, wherein: the three-phase rectifier bridge module adopts an MDS400A1600V type three-phase rectifier bridge module.
3. The adjustable power induction heating power supply system of claim 1, wherein: the inversion module adopts a single-phase full-bridge inversion assembly formed by an Infrax FF450R12KT 4IGBT module.
4. The adjustable power induction heating power supply system of claim 1, wherein: the DC rectifying filter capacitor component model is 9400 mu F/800V.
5. The adjustable power induction heating power supply system of claim 1, wherein: the type of the contactor is CJX2-95.
6. The adjustable power induction heating power supply system of claim 1, wherein: the touch screen model is mcgsTPC7062Ti.
7. The adjustable power induction heating power supply system of claim 1, wherein: the temperature detection unit adopts a DT8012B non-contact infrared temperature sensor and an XMT606 type detection instrument, the DT8012B non-contact infrared temperature sensor is aligned with the middle part of the outer wall of the graphite reaction kettle, detection signals are transmitted to the detection instrument, and the detection instrument is connected with a temperature detection interface of the main control board.
8. The adjustable power induction heating power supply system of claim 1, wherein: the model of the DSP chip on the main control board is TMS320F28335.
9. The adjustable power induction heating power supply system of claim 1, wherein: the inversion module, the resonance capacitor assembly, the resonance induction coil and the self-coupling transformer assembly adopt a cooling water circulation system for water cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110567742.2A CN113316278B (en) | 2021-05-24 | 2021-05-24 | A adjustable power induction heating electrical power generating system for graphite reation kettle heats |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110567742.2A CN113316278B (en) | 2021-05-24 | 2021-05-24 | A adjustable power induction heating electrical power generating system for graphite reation kettle heats |
Publications (2)
| Publication Number | Publication Date |
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