CN102802290A - Supersonic frequency modulation frequency electromagnetic induction heating control module based on CPLD (complex programmable logic device) - Google Patents

Abstract

The invention discloses a supersonic frequency modulation frequency electromagnetic induction heating control module based on a CPLD (complex programmable logic device). The hardware comprises a CPLD chip, a power regulation potentiometer, a 85 DEG C temperature switch, a hearth coil temperature sensor, a CT coil and a circuit, a 25 MHz crystal oscillator and an LED (light-emitting diode) indicating lamp, wherein the CPLD chip is the core of the whole module and can control the other parts to operate; the overflowing, undervoltage and overvoltage, IGBT (insulated gate bipolar translator) collection sending voltage detection, an IGBT and hearth coil overtemperature protection as well as PWM(pulse-width modulation) generation and output control are realized through the design of the interior of the chip in a logistic manner, and the manual power subtle adjustment can be realized by an adjustable potentiomete. The logic function modules are concentrated in the CPLD chip, is connected with an exterior circuit through an I/O port of the CPLD in a physical manner, the interior of the CPLD chip is divided into three relative independent sub-modules, the three sub-modules are subjected to ordered physical connection and logical combination in the chip, and are used for the control of a complicated electromagnetic heating sequential logic and a combinatorial logic.

Description

A kind of superaudio frequency modulation electromagnetic induction heating control module based on CPLD

Technical field

The present invention relates to a kind of electromagnetism heating power control technology or electronic information field, mainly is a kind of superaudio frequency modulation electromagnetic induction heating control module based on CPLD that is applied to the electromagnetic induction heating industry.

Background technology

Even to this day, electromagnetic heating technique is with its low radiation, and is pollution-free, cleaning, and numerous advantages such as environmental protection and being widelyd popularize in energy industry rapidly, and substitute traditional heating mode gradually and flood the market.But the control core of electromagnetic heating technique adopts single-chip microcomputer or general dsp chip in decades always in a large number, and this has become an insurmountable barrier really for strong electromagnetic and the electromagnetism of the speed response of seeking quickness again heating industry.Along with the reduction of the manufacturing cost of single-chip microcomputer and dsp chip, people tend to select them more, and have ignored the stable more and programmable logic device at a high speed of performance, CLPD for example, FPGA etc.Although CPLD and FPGA are widely used in the current communications field; But the successful case that is used for electromagnetism heating industry seldom; This situation has not only caused the master control borad failure rate of electromagnetism heating industry high, more makes the double rising of operation cost of enterprise, the result; Even quite a lot of a little technological improvements all are difficult to, caused the inner vicious circle of industry.

Summary of the invention

The present invention is for solving the problems of the technologies described above; A kind of superaudio frequency modulation electromagnetic induction heating control module based on CPLD is provided; It takes the lead in having adopted the high density CPLD device based on product term in this module electromagnetism heating industry; Through circuit optimization design and in-circuit emulation and debugging; Control program and protection input and output logic and state indication etc. that this module is required with all electromagnetism heating, set and piece of CPLD chip internal are through the adjusting of this module to the induction heating external circuit; Can guarantee that protection IGBT avoids damage and makes the electromagnetic induction heating load run on optimum resonant state all the time in the shortest time, for the user has practiced thrift mass energy.

To achieve these goals, the present invention adopts following technical scheme.

Superaudio frequency modulation electromagnetic induction heating control module based on CPLD of the present invention, inside modules is divided into three sub-function modules, and each sub-function module is:

Submodule 1: be used for IGBT, stone or metal plate for standing a stove on as a precaution against fire, the input of power adjustments potentiometer, and with delivering to other submodules or LED demonstration after the signal processing completion; This module is nursed one's health the clock source of the 100Hz square-wave signal of back generation as submodule 1 with the 50Hz AC signal of electrical network simultaneously, and gives the clock source of submodule 2 as submodule 2 through a three frequency division circuit with the 33Hz signal that produces; The real-time detection that this module has realized IGBT collection radio is pressed simultaneously and to the LED indication output of various malfunctions so that IGBT and control main board are protected, and is indicated the user to operate or is investigated fault through four LED lights.

Submodule 2: be used for the CT current mutual inductor coil is responded to; And the load overclocking or the over-current signal that produce through frequency or current detection circuit respectively detect; Regulate with the resonance frequency that realizes load through frequency adjustment, thus regulating load power, through detecting load current; Can handle timely the fault of load, avoid IGBT constant power components from being damaged; This module has realized the multi-system counter be made up of controllable frequency divider simultaneously, be used to coordinate between three sub-module the data interaction sequential with carry out logic control.

Submodule 3: be used for the PWM waveform and generate, power output control and to the input fault Signal Processing, and close PWM output signal and associated components thereof rapidly; Wherein, the signal source of PWM waveform is seen off by the voltage-frequency conversion chip, handles the back through internal digital and generates the complementary PWM ripple of two waveforms, and insert circuit through the dead band, has inserted the Dead Time of 2 microseconds respectively; Then, through the I/O mouth of two CPLD, after pwm signal sent into the post processing electric circuit waveform and amplify, drive the IGBT operation.

Realize that hardware of the present invention comprises: CPLD chip, power adjustments potentiometer, 85 degree celsius temperature switches, furnace bottom coil temperature transducer, CT coil and circuit thereof, 25MHz crystal oscillator and LED light; Wherein:

The CPLD chip is used for the work of outside each parts of control module; The model of CPLD chip is EPM7128SLC84-15;

Power adjustments potentiometer employing WX110 (010) 10K precision is 5% potentiometer, takies the I/O line of a CPLD, is used for power adjustments;

85 normally closed warm in nature degree centigrade of switches take the I/O line of a CPLD, realize the temperature detection of IGBT;

The semistor temperature sensor takies the I/O line of a CPLD, realizes the stone or metal plate for standing a stove on as a precaution against fire temperature detection;

CT coil and accessory circuit thereof take the I/O line of two CPLD, and wherein one is used for frequency detecting, and another root is realized over-current detection;

The 25MHz crystal oscillator takies the I/O line of a CPLD, as total clock input of chip;

LED light takies the I/O line of four CPLD, is used for module operation indication and fault alarm;

During beneficial effect of the present invention; At first be to be the control core with CPLD; And take the lead in having adopted high density programmable logic array CPLD, in the inside of CPLD chip, built the function sub-modules of three relatively independent organic connections again, through the co-ordination of three function sub-modules in electromagnetism heating industry; Accomplished to signals sampling the control of output and overall logic jointly; Because the predictability of CPLD internal digital logical sequence; The temporal characteristics of the digital circuit that can make up the CPLD chip internal carries out comprehensive assessment; Thereby make the sequential stability of circuit operation be able to ensure, and then make the CPLD chip can respond the input fault signal fast, and after in time handling; Close the output of PWM waveform in short time at the utmost point, thereby protection equipment is avoided damage.Secondly, the present invention can be used as the control core of full-bridge or half bridge series resonance power supply as a standard module.

Description of drawings

Fig. 1 is based on the superaudio electromagnetic induction heating external control module composition diagram of CPLD.

Fig. 2 is each functional module composition diagram of CPLD chip internal.

Fig. 3 is CT coil and accessory circuit figure thereof.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Module of the present invention mainly comprises following a few part:

The CPLD chip: be the core devices of whole module, by the operation of its other peripheral circuit of control, the CPLD chip that the present invention adopts is 84 pin chips of the MAX7000S of U.S. altera corp series, and its model is EPM7128SLC84-15.This chip is based on the CPLD of product term structure, is specially adapted to accomplish complicated combination, sequential logic.The device door number of EPM7128SLC84-15 is 5000,128 of macrocells, and the user can use 64 of I/O pins.Above resource can satisfy the requirement of this modular design fully.

Power adjustments potentiometer employing WX110 (010) 10K precision is 5% potentiometer, takies the I/O line of a CPLD, is used for power adjustments.The power adjustments potentiometer is delivered to three function sub-modules in the CPLD chip then together respectively through LM339 chip two comparator output levels comparison signal and under-voltage protection signal;

85 normally closed warm in nature degree centigrade of switches take the I/O line of a CPLD, realize the temperature detection of IGBT; When the IGBT heatsink temperature reaches 85 degrees centigrade,, deliver to the function sub-modules 1 of CPLD chip internal through the signal conditioning circuit output alarm pulse that TLC272 and LM339 form.

The semistor temperature sensor takies the I/O line of a CPLD, realizes the stone or metal plate for standing a stove on as a precaution against fire temperature detection;

CT coil and accessory circuit thereof take the I/O line of two CPLD, and wherein one is used for frequency detecting, and another root is realized over-current detection, and the alarm signal of generation is delivered to CPLD inner function sub-modules 3 and function sub-modules 1 respectively;

The 25MHz crystal oscillator takies the I/O line of a CPLD, as total clock input of chip;

LED light takies the I/O line of four CPLD, is used for module operation indication and fault alarm;

As shown in Figure 1, the present invention is based on the superaudio frequency modulation electromagnetic induction heating control module of CPLD, comprises the CPLD chip; The power adjustments potentiometer, 85 degree celsius temperature switches, furnace bottom coil temperature transducer; CT coil and circuit thereof, 25MHz crystal oscillator and LED light.Each parts annexation of this module is:

Power adjustments potentiometer employing WX110 (010) 10K precision is 5% potentiometer, takies the I/O line of a CPLD, is used for power adjustments;

85 normally closed warm in nature degree centigrade of switches take the I/O line of a CPLD, realize the temperature detection of IGBT;

The semistor temperature sensor takies the I/O line of a CPLD, realizes the stone or metal plate for standing a stove on as a precaution against fire temperature detection;

CT coil and accessory circuit thereof take the I/O line of two CPLD, and wherein one is used for frequency detecting, and another root is realized over-current detection;

The 25MHz crystal oscillator takies the I/O line of a CPLD, as total clock input of chip;

LED light takies the I/O line of four CPLD, is used for module operation indication and fault alarm;

Three function sub-modules graphs of a relation of CPLD chip internal of the present invention are as shown in Figure 2.

Wherein, three function sub-modules and external circuit interface definition are following:

U1-CP is the 100Hz clock input signal of CPLD function sub-modules 1;

U1-CR-DET presses detection signal for collection radio;

U1-C is an IGBT high temperature protection input signal;

U1-D is a stone or metal plate for standing a stove on as a precaution against fire coil high temperature protection input signal;

U1-14 is unusual indication LED 2

U1-15 blocks input signal for protection;

U1-16 is a stone or metal plate for standing a stove on as a precaution against fire coil high temperature protection indication LED 3;

U1-17 is an IGBT high temperature protection indication LED 4;

U2-D is inspection pot signal lag output signal;

U2-E is for passing through the detected overcurrent protection input signal of CT current transformer over-current detection circuit;

U2-H and U1-H are power fine setting input signal, from the power trimmer potentiometer;

U2-I is after abnormality is eliminated, Reflector erase pulse signal;

U3-CP is the power output signal source;

U3-C inserts for dying and uses the 2us pulse input signal;

U3-D is the power detection signal, is inspection pot signal;

U3-13 is the NE555 start pulse signal;

U3-14 is a power output indication LED 1, and when LED1 was bright, expression had power output, otherwise got into exception handles;

U3-16 is the output of inspection pot signal;

U3-18 and U3-19 are the complementary Centered PWM output signal of two-way;

Below be that the function of three function sub-modules is carried out basic description:

Submodule 1: be used for IGBT, stone or metal plate for standing a stove on as a precaution against fire, the input of power adjustments potentiometer, and with delivering to other submodules or LED demonstration after the signal processing completion.This module is nursed one's health the clock source of the 100Hz square-wave signal of back generation as submodule 1 with the 50Hz AC signal of electrical network simultaneously, and gives the clock source of submodule 2 as submodule 2 through a three frequency division circuit with the 33Hz signal that produces.This module has realized exporting to the supper-fast detection of IGBT collection radio pressure with to the LED indication of various malfunctions simultaneously; So that in the shortest time, IGBT and control main board are protected, and indicate the user to operate or investigate fault through four LED lights.

Submodule 2: be used for the CT current mutual inductor coil is responded to; And the load overclocking or the over-current signal that produce through frequency or current detection circuit respectively detect; Regulate with the resonance frequency that realizes load through frequency adjustment, thus regulating load power, through detecting load current; Can handle timely the fault of load, avoid IGBT constant power components from being damaged.This module has realized the multi-system counter be made up of controllable frequency divider simultaneously, be used to coordinate between three sub-module the data interaction sequential with carry out logic control.

Submodule 3: be used for the PWM waveform and generate, power output control and to the input fault Signal Processing, and close PWM output signal and associated components thereof rapidly.Wherein, the signal source of PWM waveform is seen off by 3 pin of voltage-frequency conversion chip LM331, handles the back through internal digital and generates the complementary PWM ripple of two waveforms, and insert circuit through the dead band, has inserted the Dead Time of 2 microseconds respectively.Then, through the I/O mouth of two CPLD, after pwm signal sent into the post processing electric circuit waveform and amplify, drive the IGBT operation.

Though the above-mentioned accompanying drawing specific embodiments of the invention that combines is described; But be not restriction to protection range of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (1)

1. the superaudio frequency modulation electromagnetic induction heating control module based on CPLD is characterized in that inside modules is divided into three sub-function modules, and each sub-function module is:

Submodule 1: be used for IGBT, stone or metal plate for standing a stove on as a precaution against fire, the input of power adjustments potentiometer, and with delivering to other submodules or LED demonstration after the signal processing completion; This module is nursed one's health the clock source of the 100Hz square-wave signal of back generation as submodule 1 with the 50Hz AC signal of electrical network simultaneously, and gives the clock source of submodule 2 as submodule 2 through a three frequency division circuit with the 33Hz signal that produces; This module has realized exporting to the supper-fast detection of IGBT collection radio pressure with to the LED indication of various malfunctions simultaneously; So that in the shortest time, IGBT and control main board are protected, and indicate the user to operate or investigate fault through four LED lights;

Submodule 2: be used for the CT current mutual inductor coil is responded to; And the load overclocking or the over-current signal that produce through frequency or current detection circuit respectively detect; Regulate with the resonance frequency that realizes load through frequency adjustment; Thereby regulating load power, this module have been realized the multi-system counter be made up of controllable frequency divider simultaneously, be used to coordinate between three sub-module the data interaction sequential with carry out logic control;

Submodule 3: be used for the PWM waveform and generate, power output control and to the input fault Signal Processing, and close PWM output signal and associated components thereof rapidly; Wherein, the signal source of PWM waveform is seen off by the voltage-frequency conversion chip, handles the back through internal digital and generates the complementary PWM ripple of two waveforms, and insert circuit through the dead band, has inserted the Dead Time of 2 microseconds respectively; Then, through the I/O mouth of two CPLD, after pwm signal sent into the post processing electric circuit waveform and amplify, drive the IGBT operation.

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