CN102573157B - Frequency self-adaptive circuit of parallel resonant induction heating power supply - Google Patents
Frequency self-adaptive circuit of parallel resonant induction heating power supply Download PDFInfo
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- CN102573157B CN102573157B CN201210015296.5A CN201210015296A CN102573157B CN 102573157 B CN102573157 B CN 102573157B CN 201210015296 A CN201210015296 A CN 201210015296A CN 102573157 B CN102573157 B CN 102573157B
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Abstract
The invention belongs to the electric technical field and discloses a frequency self-adaptive circuit of a parallel resonant induction heating power supply. The frequency self-adaptive circuit comprises a swept-frequency start circuit (1), a frequency tracking circuit (2), an overlap area processing circuit (3) and a signal gating circuit (4), wherein the swept-frequency start circuit (1) is used for outputting swept-frequency driving signals which change continuously in frequency, driving an inverter through the signal gating circuit and detecting feedback signals output by the inverter, and when the amplitude of the feedback signals achieves a threshold value, a system is converted from swept-frequency start to frequency tracking, and the frequency tracking circuit is used for tracking the changes of a load in resonance frequency in a real-time manner; and the overlap area processing circuit is used for adjusting an overlap area of two lines of driving signals. The frequency self-adaptive circuit disclosed by the invention can realize reliable start and tracking within a wider load frequency range without artificial adjustment and has the characteristics of simple structure, good adaptability of the load and reliable start.
Description
Technical field
The invention belongs to technical field of electricity, disclose a kind of parallel resonance induction heating power frequency self-adaption circuit.
Background technology
At present, the advantage such as induction heating is high with its efficiency of heating surface, quick heating, controllability are good, is widely used in the fields such as melting, diathermanous, quenching, and induction heating power is one of its key equipment.But, power supply output frequency is determined by geometry and the skin depth of processing work, different workpiece and technological requirement need power supply in wider frequency range, to work, and the problem of difficulty in starting may appear in parallel resonance induction heating power in wider frequency range.In heating process, due to the variation of the factors such as temperature, load natural resonance frequency changes with the variation of load equivalent parameter simultaneously.For power supply can normally be started simultaneously in heating process all the time in resonance or quasi-resonance state under broadband, must proportion adaptive circuit.
The induction heating power of traditional CD4046 analog phase-locked look, has that the frequency range of startup is narrow, to start success rate low, the shortcoming of low-response after Frequency Locking.And digitlization induction heating power is not yet realized system fully digitalization at present, complex interfaces, cost is higher.
The patent No. is the starting of oscillation tracking technique that relates to induction heating power in 200610023406.7 file, but the technology of setting forth in this file tracker when starting is passive tracking starting resistor, when larger variation occurs load resonant frequency, (for example changing technique) needs professional to adjust.
Summary of the invention
For the problem that traditional induction heating power starts and frequency-tracking exists, the object of the invention is to propose a kind of parallel resonance induction heating power frequency self-adaption circuit, make it without artificial adjustment, can in wider load frequency range, realize and reliable start and follow the tracks of, have simple in structure, workload-adaptability good, start reliable feature.
The present invention adopts following technical scheme for completing foregoing invention task:
A kind of parallel resonance induction heating power frequency self-adaption circuit, described parallel resonance induction heating power frequency self-adaption circuit comprises frequency sweep start-up circuit, frequency tracking circuit, overlapping region treatment circuit and signal gating circuit, during power initiation, frequency sweep start-up circuit output frequency continually varying drives signal in order to the frequency sweep that drives inverter, this signal directly drives inverter by signal gating circuit, the comparator consisting of operational amplifier detects the feedback signal of inverter output, when feedback signal amplitude reaches default threshold value, illustrate that current frequency has approached load resonant frequency, self-excitation/its energizing signal level now being generated by comparison circuit changes, control system is converted to frequency-tracking pattern by frequency sweep start-up mode, inverter output frequency is locked on load natural resonance frequency, overlapping region treatment circuit is responsible for adjusting the overlapping region of two-way driving signal.The variation of final frequency tracking circuit real-time tracking load resonant frequency, realizes the self adaptation of output drive signal frequency to load resonant frequency.
Described frequency sweep start-up circuit mainly comprises edge generative circuit, voltage comparator ic 2A, operational amplifier IC2C, emitter voltage follower IC2B, Phase Lock Loop IC 6, capacitor C 17, variable resistor RP5 and peripheral circuit; The output of described voltage comparator ic 2A is connected with operational amplifier IC2C; The output of described operational amplifier IC2C is connected with emitter voltage follower IC2B with resistance R 16, capacitor C 8 and rectifying tube ZD1 its output of proportional integral device forming in parallel in peripheral circuit; The output of described emitter voltage follower IC2B is connected with Phase Lock Loop IC 6, forms frequency sweep start-up circuit, and the output output swept-frequency signal U-OPEN of Phase Lock Loop IC 6 voltage controlled oscillators is sent into signal gating circuit; The edge generative circuit consisting of diode D2, resistance R 18, R19, capacitor C 12 converts external input signal OSC_1 the positive input of being sent into voltage comparator ic 2A afterwards, and the reverse input end of voltage comparator ic 2A sent into dividing potential drop by resistance R 3, R4 formation bleeder circuit simultaneously; After the edge generative circuit shaping that the output of voltage comparator ic 2A forms through diode D1, resistance R 11, R12, send into the reverse input end of operational amplifier IC2C, the positive input ground connection of operational amplifier IC2C; Resistance R 16, capacitor C 8 and rectifying tube ZD1 composition integrator in parallel between output and the reverse input end of operational amplifier IC2C; The in-phase input end of the output access emitter voltage follower IC2B of described proportional integral device, the output of emitter voltage follower IC2B and inverting input are direct-connected and access the input of Phase Lock Loop IC 6 voltage controlled oscillators; The output output swept-frequency signal U-OPEN of voltage controlled oscillator, and swept-frequency signal U-OPEN is sent into signal gating circuit; Phase Lock Loop IC 6, capacitor C 17 and slide rheostat RP5 form open loop oscillator.
Described frequency tracking circuit mainly comprises Phase Lock Loop IC 1, resistance-capacitance network, operational amplifier IC3 and amplifier feedback network; The input input of described Phase Lock Loop IC 1 phase discriminator is from signal I-SF and the U-SF of overlapping region treatment circuit and signal gating circuit 04, and the resistance-capacitance network that the output of Phase Lock Loop IC 1 phase discriminator consists of resistance R 5, R7, R8, R10 and capacitor C 3 is sent into the reverse input end of operational amplifier IC3; The output of operational amplifier IC3 feeds back to back the input of the voltage controlled oscillator of Phase Lock Loop IC 1, forms closed loop feedback, realizes frequency-tracking function, and the output signal VCOUT of Phase Lock Loop IC 1 voltage controlled oscillator is sent into overlapping region treatment circuit; The in-phase input end access threshold level of operational amplifier IC3, its size is obtained by resistance R 9 and slide rheostat RP1 dividing potential drop, and resistance R 13, capacitor C 7 are connected on as the feedback of operational amplifier IC3 between the reverse input end and output of operational amplifier IC3; The output signal of operational amplifier IC3 is passed through the filter consisting of R15 and C9, feeds back to the input of Phase Lock Loop IC 1 voltage controlled oscillator; The output signal VCOUT of described Phase Lock Loop IC 1 voltage controlled oscillator sends into overlapping region treatment circuit; Phase Lock Loop IC 1 forms phase-locked loop with capacitor C 1, resistance R 1, and locking inverter output frequency is in load natural frequency.
Described overlapping region treatment circuit mainly comprises frequency divider and oscillator; Described frequency divider is comprised of frequency divider IC4A, frequency divider IC4B cascade; Described oscillator consists of slide rheostat RP2, capacitor C 10 and IC5A; The high level that frequency divider IC4A exports is sent into the input of oscillator IC5A on the one hand, send on the other hand frequency divider IC4B, the edge generative circuit that the edge generative circuit that the signal D111 that oscillator is exported, output signal Q111, the Q222 of frequency divider IC4B form through R21, R22, D3 respectively and R20, R23, D4 form by signal input Schmidt trigger IC7A, IC7B, IC7C, IC7D carry out waveform and adjust; Schmidt trigger IC7A-D delivers to signal gating circuit by pulse signal Signal1, Signal2 after received signal is processed; After the edge generative circuit that output signal Q111, the Q222 of frequency divider IC4B form through R20, R23, D4 simultaneously and IC7B, output is in order to the gating signal I-SF of gating frequency tracking circuit.
Described signal gating main circuit will comprise limit data selector, comparator IC2D and drive circuit IC12B, IC13; The filter of feedback signal MFV_FB through being formed by resistance R 17, capacitor C 11, the normal phase input end of access comparator IC2D, the reverse input end of comparator IC2D sent into dividing potential drop by resistance R 24, slide rheostat RP3 formation bleeder circuit simultaneously; The output of comparator IC2D generates the selecting side of self-excitation/its energizing signal ZJ-TJ as data selector through processing, and for selecting the input signal of Phase Lock Loop IC 1 phase discriminator, is from feedback signal MFV_FB or swept-frequency signal U-OPEN; Input signal OSC_1 is through sending into the selecting side of data selector after diode D5, resistance R 25, R26 shaping, for select+15V level or from pulse signal Signal1, the Signal2 of overlapping region treatment circuit; While only having OSC_1 to be stabilized in high level, the Driven by inverter signal before generating just can be strobed, and two paths of signals is respectively through chip IC 12B and the IC13A of overdriving, and output is applicable to driving the signal of inverter; Otherwise, data selector output+15V level, this level cannot drive inverter, and inverter is not worked.The Z item of data selector output is simultaneously in order to the gating signal U-SF of gating frequency tracking circuit.
A kind of parallel resonance induction heating power frequency self-adaption circuit that the present invention proposes, for Parallel Resonant induction heating power, start moment because output voltage is not yet set up the starting problem causing, the mode that adopts frequency sweep to start, and utilize the power of feedback voltage to judge whether to carry out follow-up frequency-tracking; Because frequency sweep process is very short but frequency band is very wide, no matter the load requiring for different frequency, be underloading or heavy duty, and the present invention just can reliably start without artificial adjustment, and success rate reaches 100%.Simultaneously, after starting, be switched to frequency-tracking pattern, by phase shift adjusting, dead band processing, phase place locking, make the variation of Driven by inverter signal energy real-time tracking load, guarantee that induction heating power is all the time in resonance or quasi-resonance state, improve active power, have simple in structure, workload-adaptability good, start reliable feature.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of frequency sweep start-up circuit in the present invention.
Fig. 3 is the circuit theory diagrams of medium frequency tracking circuit of the present invention.
Fig. 4 is the circuit theory diagrams of overlapping region treatment circuit in the present invention.
Fig. 5 is the circuit theory diagrams of signal gating circuit in the present invention.
Fig. 6 is inverter output waveforms of the present invention.
Fig. 7 is driving waveform overlapping time of the present invention.
In figure: 1, frequency sweep start-up circuit, 2, frequency tracking circuit, 3, overlapping region treatment circuit, 4, signal gating circuit.
Embodiment
With specific embodiment, the present invention is illustrated by reference to the accompanying drawings;
As shown in Figure 1, a kind of parallel resonance induction heating power frequency self-adaption circuit, described parallel resonance induction heating power frequency self-adaption circuit comprises frequency sweep start-up circuit 1, frequency tracking circuit 2, overlapping region treatment circuit 3 and signal gating circuit 4, during power initiation, frequency sweep start-up circuit 1 output frequency continually varying drives signal in order to the frequency sweep that drives inverter, this signal directly drives inverter by signal gating circuit 4, the comparator consisting of operational amplifier detects the feedback signal of inverter output, when feedback signal amplitude reaches default threshold value, illustrate that current frequency has approached load resonant frequency, self-excitation/its energizing signal level now being generated by comparison circuit changes, control system is converted to frequency-tracking pattern by frequency sweep start-up mode, inverter output frequency is locked on load natural resonance frequency, overlapping region treatment circuit 3 is responsible for adjusting the overlapping region of two-way driving signal.The variation of final frequency tracking circuit 2 real-time tracking load resonant frequencies, realizes the self adaptation of output drive signal frequency to load resonant frequency.
As shown in Figure 2, described frequency sweep start-up circuit 1 mainly comprises edge generative circuit, voltage comparator ic 2A, operational amplifier IC2C, emitter voltage follower IC2B, Phase Lock Loop IC 6 and capacitor C 17, variable resistor RP5; The edge generative circuit consisting of diode D2, resistance R 18, R19, capacitor C 12 converts external input signal OSC_1 the positive input of being sent into voltage comparator ic 2A afterwards, and the reverse input end of voltage comparator ic 2A sent into dividing potential drop by resistance R 3, R4 formation bleeder circuit simultaneously; After the edge generative circuit shaping that the output of voltage comparator ic 2A forms through diode D1, resistance R 11, R12, send into the reverse input end of operational amplifier IC2C, the positive input ground connection of operational amplifier IC2C; Resistance R 16, capacitor C 8 and rectifying tube ZD1 composition integrator in parallel between output and the reverse input end of operational amplifier IC2C; Described proportional integral device is converted to direct current signal the in-phase input end of continually varying ramp signal access emitter follower IC2B, and the output of emitter follower IC2B and inverting input are direct-connected and access the input of Phase Lock Loop IC 6 voltage controlled oscillators; The output output swept-frequency signal U-OPEN of voltage controlled oscillator, and swept-frequency signal U-OPEN is sent into signal gating circuit; Phase Lock Loop IC 6, capacitor C 17 and slide rheostat RP5 form open loop oscillator, and Phase Lock Loop IC 6 is in operate in open loop state state, and output frequency is directly subject to the control of voltage controlled oscillator input terminal voltage, therefore now exports continually varying swept-frequency signal; Described Phase Lock Loop IC 6 adopts simulaed phase locked loop CD4046 of the prior art.
As shown in Figure 3, described frequency tracking circuit 2 mainly comprises Phase Lock Loop IC 1, resistance-capacitance network, operational amplifier IC3 and amplifier feedback circuit; The input input of described Phase Lock Loop IC 1 phase discriminator is from signal I-SF and the U-SF of overlapping region treatment circuit and signal gating circuit 04, the resistance-capacitance network that the output of Phase Lock Loop IC 1 phase discriminator forms through resistance R 5, R7, R8, R10 and capacitor C 3 is received the reverse input end of operational amplifier IC3, the in-phase input end access resistance R 9 of operational amplifier IC3 and the bleeder circuit forming of slide rheostat RP1, resistance R 13, capacitor C 7 are connected on as the feedback of operational amplifier IC3 between the reverse input end and output of operational amplifier IC3; The output signal of operational amplifier IC3 is passed through the filter consisting of R15 and C9, feeds back to the input of Phase Lock Loop IC 1 voltage controlled oscillator, regulates RP1 can finely tune output frequency, thereby changes inverter operating state; The output frequency tracking signal VCOUT of described Phase Lock Loop IC 1 voltage controlled oscillator sends into overlapping region treatment circuit; Phase Lock Loop IC 1 forms phase-locked loop with capacitor C 1, resistance R 1, and described phase-locked loop adopts simulaed phase locked loop CD4046 of the prior art, and locking inverter output frequency is in load natural frequency; Induction heating power duration of work is all the time in resonance or quasi-resonance state, and inverter output waveforms as shown in Figure 6.
As shown in Figure 4, described overlapping region treatment circuit 3 receives the frequency-tracking signal from frequency tracking circuit 02, and increase drives signal to deliver to signal gating circuit two-way inversion after overlapping time; Overlapping region treatment circuit mainly comprises frequency divider, oscillator and logical circuit; Described frequency divider adopts frequency divider CD4013 of the prior art, and described frequency divider is comprised of frequency divider IC4A, frequency divider IC4B cascade; Described oscillator adopts oscillator CD4098 of the prior art, slide rheostat RP2, capacitor C 10 and IC5A, consists of; The high level that frequency divider IC4A exports is sent into the input of IC5A in oscillator on the one hand, send on the other hand frequency divider IC4B, the edge generative circuit that the edge generative circuit that the signal D111 that oscillator is exported, output signal Q111, the Q222 of frequency divider IC4B form through R21, R22, D3 respectively and R20, R23, D4 form by signal input Schmidt trigger IC7A, IC7B, IC7C, IC7D carry out waveform and adjust; After Schmidt trigger IC7A-D processes received signal, production burst signal Signal1, Signal2 deliver to signal gating circuit; The signal D111 that after the edge generative circuit that output signal Q111, the Q222 of frequency divider IC4B form through R20, R23, D4 simultaneously and IC7B, output is exported in order to the gating signal I-SF oscillator of gating frequency tracking circuit is the width that drives overlapping region signal, can change overlapping region width by fine setting RP2, drive the waveform of overlapped signal as shown in Figure 7.
As shown in Figure 5, described signal gating circuit 4 is used the Driven by inverter signal receiving directly to drive inverter, determine self-excitation/its sharp switching time simultaneously, mainly comprise edge generative circuit, data selector, comparator IC2D and drive circuit IC12B, IC13; The filter of feedback signal MFV_FB through being formed by resistance R 17, capacitor C 11, the normal phase input end of access comparator IC2D, the reverse input end of comparator IC2D sent into dividing potential drop by resistance R 24, slide rheostat RP3 formation bleeder circuit simultaneously; The output of comparator IC2D generates the selecting side of self-excitation/its energizing signal ZJ-TJ as data selector through processing, and control system is started and is converted to voluntarily frequency-tracking state by frequency sweep; For selecting the input signal of Phase Lock Loop IC 1 phase discriminator, be from feedback signal MFV_FB or swept-frequency signal U-OPEN; Input signal OSC_1 is through sending into the selecting side of data selector after diode D5, resistance R 25, R26 shaping, for selecting Gao Ping+15V or pulse signal Signal1, Signal2 from overlapping region treatment circuit; While only having OSC_1 to be stabilized in high level, the Driven by inverter signal before generating just can be strobed, and output is for driving the signal of inverter; Otherwise, data selector output+15V level, this signal cannot drive inverter, and inverter is not worked; The output of data selector is in order to the gating signal U-SF of gating frequency tracking circuit simultaneously; Described data selector is data selector CD4053 of the prior art.
Claims (1)
1. a parallel resonance induction heating power frequency self-adaption circuit, it is characterized in that: described parallel resonance induction heating power frequency self-adaption circuit comprises frequency sweep start-up circuit (1), frequency tracking circuit (2), overlapping region treatment circuit (3) and signal gating circuit (4), during power initiation, frequency sweep start-up circuit (1) output frequency continually varying drives signal in order to the frequency sweep that drives inverter, this signal directly drives inverter by signal gating circuit (4), the comparator consisting of operational amplifier detects the feedback signal of inverter output, when feedback signal amplitude reaches default threshold value, illustrate that current frequency has approached load resonant frequency, self-excitation/its energizing signal level that now comparison circuit generates changes, control system is converted to frequency-tracking pattern by frequency sweep start-up mode, inverter output frequency is locked on load natural resonance frequency, overlapping region treatment circuit (3) is responsible for adjusting the overlapping region of two-way driving signal, the variation of final frequency tracking circuit (2) real-time tracking load resonant frequency, realizes the self adaptation of output drive signal frequency to load resonant frequency,
Described frequency sweep start-up circuit includes edge generative circuit, voltage comparator ic 2A, operational amplifier IC2C, emitter voltage follower IC2B, Phase Lock Loop IC 6, capacitor C 17, variable resistor RP5 and peripheral circuit; The output of described voltage comparator ic 2A is connected with operational amplifier IC2C; The output of described operational amplifier IC2C is connected with emitter voltage follower IC2B with resistance R 16, capacitor C 8 and rectifying tube ZD1 its output of proportional integral device forming in parallel in peripheral circuit; The output of described emitter voltage follower IC2B is connected with Phase Lock Loop IC 6, forms frequency sweep start-up circuit, and the output output swept-frequency signal U-OPEN of the voltage controlled oscillator of Phase Lock Loop IC 6 is sent into signal gating circuit; The edge generative circuit consisting of diode D2, resistance R 18, R19, capacitor C 12 converts external input signal OSC_1 the positive input of being sent into voltage comparator ic 2A afterwards, and the reverse input end of voltage comparator ic 2A sent into dividing potential drop by resistance R 3, R4 formation bleeder circuit simultaneously; After the edge generative circuit shaping that the output of voltage comparator ic 2A forms through diode D1, resistance R 11, R12, send into the reverse input end of operational amplifier IC2C, the positive input ground connection of operational amplifier IC2C; Resistance R 16, capacitor C 8 and rectifying tube ZD1 composition integrator in parallel between output and the reverse input end of operational amplifier IC2C; The in-phase input end of the output access emitter voltage follower IC2B of described proportional integral device, the output of emitter voltage follower IC2B and inverting input are direct-connected and access the input of the voltage controlled oscillator of Phase Lock Loop IC 6; The output output swept-frequency signal U-OPEN of the voltage controlled oscillator of Phase Lock Loop IC 6, and swept-frequency signal U-OPEN is sent into signal gating circuit; Phase Lock Loop IC 6, capacitor C 17 and slide rheostat RP5 form open loop oscillator;
Described frequency tracking circuit includes Phase Lock Loop IC 1, resistance-capacitance network, operational amplifier IC3 and amplifier feedback network; The input input of the phase discriminator of described Phase Lock Loop IC 1 is from signal I-SF and the U-SF of overlapping region treatment circuit and signal gating circuit (4), and the resistance-capacitance network that the output of the phase discriminator of Phase Lock Loop IC 1 consists of resistance R 5, R7, R8, R10 and capacitor C 3 is sent into the reverse input end of operational amplifier IC3; The output of operational amplifier IC3 feeds back to back the input of the voltage controlled oscillator of Phase Lock Loop IC 1, forms closed loop feedback, realizes frequency-tracking function, and the output signal VCOUT of the voltage controlled oscillator of Phase Lock Loop IC 1 is sent into overlapping region treatment circuit; The in-phase input end access threshold level of operational amplifier IC3, its size is obtained by resistance R 9 and slide rheostat RP1 dividing potential drop, and resistance R 13, capacitor C 7 are connected on as the feedback of operational amplifier IC3 between the reverse input end and output of operational amplifier IC3; The output signal of operational amplifier IC3 is passed through the filter consisting of R15 and C9, feeds back to the input of the voltage controlled oscillator of Phase Lock Loop IC 1; The output signal VCOUT of the voltage controlled oscillator of described Phase Lock Loop IC 1 sends into overlapping region treatment circuit; Phase Lock Loop IC 1 forms phase-locked loop with capacitor C 1, resistance R 1, and locking inverter output frequency is in load natural frequency;
Described overlapping region treatment circuit includes frequency dividing circuit and oscillating circuit; Described frequency dividing circuit is comprised of frequency divider IC4A, frequency divider IC4B cascade; Described oscillating circuit consists of slide rheostat RP2, capacitor C 10 and oscillator IC5A; The high level that frequency divider IC4A exports is sent into the input of oscillator IC5A on the one hand, send on the other hand frequency divider IC4B, together with the signal D111 exporting with oscillating circuit after the edge generative circuit that the driving signal Q111 of frequency divider IC4B output forms through resistance R 20, resistance R 23, diode D4, sending into Schmidt trigger IC7B carries out waveform and adjusts, obtain the gating signal I-SF in order to gating frequency tracking circuit, gating signal I-SF enters Schmidt trigger
iC7C,schmidt trigger IC7C delivers to signal gating circuit by pulse signal Signal1 after received signal is processed; Together with the signal D111 exporting with oscillating circuit after the edge generative circuit that the driving signal Q222 of frequency divider IC4B output forms through resistance R 21, resistance R 22, diode D3, send into Schmidt trigger IC7A, IC7D and carry out waveform and adjust, the signal that Schmidt trigger IC7A, IC7D will be received is delivered to signal gating circuit by pulse signal Signal2 after processing;
Described signal gating circuit includes data selector, comparator IC2D and drive circuit IC12B, IC13A; By induction heating power, exported the filter of the voltage feedback signal MFV_FB collecting through being formed by resistance R 17, capacitor C 11, the normal phase input end of access comparator IC2D, the reverse input end of comparator IC2D sent into dividing potential drop by resistance R 24, slide rheostat RP3 formation bleeder circuit simultaneously; The output of comparator IC2D generates the selecting side of self-excitation/its energizing signal ZJ-TJ as data selector through processing, and for the input signal of the phase discriminator of selecting Phase Lock Loop IC 1, is from voltage feedback signal MFV_FB or swept-frequency signal U-OPEN; Input signal OSC_1 is through sending into the selecting side of data selector after diode D5, resistance R 25, R26 shaping, for select+15V level or from pulse signal Signal1, the Signal2 of overlapping region treatment circuit; While only having OSC_1 to be stabilized in high level, the Driven by inverter signal before generating, above-mentioned pulse signal Signal1, Signal2 from overlapping region treatment circuit, just can be strobed, two paths of signals is respectively through chip IC 12B and the IC13A of overdriving, and output is applicable to driving the signal of inverter; Otherwise, data selector output+15V level, this signal cannot drive inverter, and inverter is not worked; The output of data selector is in order to the gating signal U-SF of gating frequency tracking circuit simultaneously.
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| CN102781129B (en) * | 2012-07-23 | 2014-05-07 | 淄博助友石油化工有限公司 | Self-adaptive electro-magnetic induction heating controller |
| CN103684431A (en) * | 2013-12-03 | 2014-03-26 | 电子科技大学 | Phase-locked loop capable of being quickly locked and method for locking phase-locked loop |
| US9641113B2 (en) | 2014-02-28 | 2017-05-02 | General Electric Company | System and method for controlling a power generation system based on PLL errors |
| CN104602376B (en) * | 2014-12-29 | 2016-05-11 | 重庆恒锐机电有限公司 | High-power eddy-current heating parallel operation power-supply device |
| CN105472804B (en) * | 2015-12-11 | 2018-10-16 | 洛阳理工学院 | Parallel induction heating power supply inversion feedback circuit and method |
| CN107727927B (en) * | 2017-12-01 | 2023-10-20 | 江苏科技大学 | Frequency converter resonance detection and frequency tracking system of induction heating leveler |
| CN109379795B (en) * | 2018-11-29 | 2021-08-10 | 洛阳升华感应加热股份有限公司 | Inversion frequency tracking phase-locking control system of induction heating power supply |
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| CN87215311U (en) * | 1987-11-09 | 1988-08-24 | 第二汽车制造厂 | Thyristor numeric control inverse change regulator for intermediate-frequency power |
| CN202551390U (en) * | 2012-01-18 | 2012-11-21 | 洛阳升华感应加热有限公司 | Parallel resonance induction heating power frequency adaptive circuit |
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| JPH0880090A (en) * | 1994-09-02 | 1996-03-22 | Sawafuji Electric Co Ltd | Power unit of oscillatory compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87215311U (en) * | 1987-11-09 | 1988-08-24 | 第二汽车制造厂 | Thyristor numeric control inverse change regulator for intermediate-frequency power |
| CN202551390U (en) * | 2012-01-18 | 2012-11-21 | 洛阳升华感应加热有限公司 | Parallel resonance induction heating power frequency adaptive circuit |
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