CN202721845U - Energy-saving type high-power IGBT series resonance type forging induction heating furnace - Google Patents
Energy-saving type high-power IGBT series resonance type forging induction heating furnace Download PDFInfo
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- CN202721845U CN202721845U CN 201220294570 CN201220294570U CN202721845U CN 202721845 U CN202721845 U CN 202721845U CN 201220294570 CN201220294570 CN 201220294570 CN 201220294570 U CN201220294570 U CN 201220294570U CN 202721845 U CN202721845 U CN 202721845U
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Abstract
The utility model discloses an energy-saving type high-power IGBT series resonance type forging induction heating furnace. The energy-saving type high-power IGBT series resonance type forging induction heating furnace comprises a rectifying main circuit, an inverter circuit, a control circuit and a driving circuit. The three-phase power-frequency alternating current is rectified through the rectifying main circuit and then is connected to the inverter circuit. The output of the inverter circuit is connected to the furnace body and is sampled through a mutual inductor so as to be fed back to the control circuit. The control circuit is connected with the driving circuit. The driving circuit is connected with a power module IGBT to form a closed circuit. The output end of the power module IGBT is connected to a serially-connected resonance capacitor to from an oscillating circuit on the furnace body. According to the forging induction heating furnace of the utility model, the cost in the forging industry is greatly reduced, the efficiency is improved, the product competitiveness is improved, and the energy consumption is greatly reduced at the same time, so the national call of energy-saving and emission reduction is well implemented.
Description
Technical field
The utility model relates to a kind of induction heater that is applied to Forging Heat Equipment of the IGBT of employing series resonant circuit.
Background technology
In recent years, China's forging industry is flourish.Forge furnace is one of capital equipment that forges processing, and the heating process cost of forging accounts for the total cost of production significant proportion.China is because a variety of causes such as energy resource structure, the industrial structure, industry distribution have forge furnace enormous amount, producer's dispersion now, and developed regions quantity is more.These forge furnaces are because highly energy-consuming, high pollution, are the severely afflicated area of environmental protection, also are the key object of saving energy and reduce the cost.Heating process has occupied leading position by the Medium Frequency Induction Heating Furnace of traditional employing controllable silicon antiresonant circuit at present before the forging of forging industry. and parallel resonance is called again current resonance, because resonance current is Q times (Q is the quality factor of resonant circuit) of direct current, electric current is very large, loss power P=I2*R*T, in resistance R, electric current I increases circuit loss is increased greatly in the constant situation of time T, be the half control device because of controllable silicon again, its switching loss is very large again, thereby has wasted mass energy.The efficiency of energy utilization that therefore will improve induction heating power just can only be from 1. minimizing electric current, so 2 use full control device. the controllable silicon antiresonant circuit is because the solid of its circuit determined that with pattern its electric current under certain power cannot reduce, and controllable silicon is the half control device, is difficult to raise the efficiency.
The utility model content
The utility model purpose is to provide a kind of energy-saving high-power IGBT serial-resonant induction heater for the defective that prior art exists, and its circuit is not only simple in structure, and can effectively solve the problem of the switching loss of circuit own loss and device.
The utility model adopts following technical scheme for achieving the above object: a kind of energy-saving high-power IGBT serial-resonant forges induction heater, comprises body of heater, also comprises rectification main circuit, inverter circuit master, control circuit and drive circuit; The three-phase main-frequency alternating current connects inverter circuit after by the rectification main circuit rectification, and described inverter circuit output connects body of heater and feeds back to control circuit by the instrument transformer sampling; Described control circuit is connected with drive circuit, and drive circuit and power model IGBT are connected to form a closed circuit; Described power model IGBT output is received on the resonant capacitance of serial connection and the body of heater and is formed oscillating circuit.
Further, described control circuit comprises PFM impulse controller, power regulation circuit and protective circuit, the mutual inductor sample signal divides two the tunnel, the one tunnel to follow the tracks of the power circuit oscillation frequency change to phase-locked loop chip, and another road is through the computing of making comparisons of the set-point of operational amplifier and power regulation circuit; Described operational amplifier output terminal connects the 9th pin of phase-locked loop chip, serial-resonant is forged the power output of induction heating power device and regulates; The 4th pin output frequency of described phase-locked loop chip is divided into two paths of signals behind the two-divider and receives OR circuit and form dead-zone circuit with the RC circuit.
Further, described drive circuit input is electrically connected with logical circuit by the electromagnetic coupler that is provided with the control circuit output, and described logical circuit is electrically connected with switching circuit.
Preferably, described switching circuit is comprised of pliotron.
The beneficial effects of the utility model: IGBT serial-resonant full-bridge circuit intermediate frequency induction heating power supply is used for forging front diathermanous equipment, its effective output reaches more than 90%, than traditional controllable silicon parallel resonance formula power supply energy-conservation 20%, obtained breakthrough, this circuit and traditional resonant capacitance and body of heater parallel connection or resonant capacitance and output transformer are connected in series these two kinds of circuits and have compared to improve the lower voltage electric current and reduced the electrical loss on the body of heater.Greatly save cost for forging industry, improved efficient, improved the competitiveness of product, greatly saved the energy simultaneously, well implemented the call that national energy-saving reduces discharging.
Description of drawings
Fig. 1 main circuit diagram of the present utility model;
Fig. 2 control circuit figure of the present utility model;
Fig. 3 drive circuit figure of the present utility model.
Embodiment
In the utility model, diathermic furnace is by body of heater, and bus-bar, converter plant, cooling device and control part five parts of grading form.Be the known technology of common commissioning staff in the industry except outer other four parts of converter plant in above-mentioned five parts, therefore not one by one narration in the utility model.
As shown in Figure 1, converter plant comprises rectification main circuit, inverter circuit master, control circuit and drive circuit in the utility model.Wherein, connect inverter circuit after the rectification, inversion output connects body of heater, and feeds back to control circuit by the instrument transformer sampling, and control circuit and drive circuit link, and drive circuit and power model IGBT link and form a closed circuit.
The three-phase main-frequency alternating current is exported dc pulse moving voltage after by full-bridge rectifier; In order to obtain the galvanic current source, make load terminal voltage constant, the impact that not changed by load impedance; Therefore behind rectifier, add a large capacitor C 1.Although because traditional electrochemical capacitor capacity is large, the ability of its energy-absorbing ripple current is too little, withstand voltage low again, cannot bear back-pressure, need a plurality of electric capacity strings and etc. shortcoming.. thereby adopt novel thin-film capacitor, and its power factor (PF) is improved, have resonance current increase, withstand voltage high characteristics.
It is that control circuit and drive circuit directly do not connect so that control circuit is more safe and reliable high-pressure section and low-pressure section in electric the isolation that above-mentioned drive circuit adopts high-frequency electromagnetic coupler and control circuit to link as shown in Figure 3, and then the circuit between high pressure and the low pressure is isolated, improve circuit and do the interference performance.Use electromagnetic coupler to avoid the photoelectrical coupler output-consistence poor, the large shortcoming of output discreteness.Inverter main circuit is connected with overcurrent protection, overvoltage protection, open-phase protection, and above-mentioned various protective circuit all is connected with warning circuit, and warning circuit is connected with control circuit.
When the bearing power factor was not 1, the reactive current of load need to flow through switching device, and in order to provide path to reactive current, therefore fast diode of reverse parallel connection on each IGBT makes IGBT can not be subjected to the impact of bearing power factor.
Wherein, damage because of the short circuit current of large capacitor C 1 for fear of switching device IGBT, in switching device IGBT commutation process, the upper and lower IGBT module of same brachium pontis must be closed first and be had no progeny open-mindedly, namely should leave certain Dead Time.The whole course of work is: the three-phase main-frequency alternating current becomes dc pulse moving voltage after by full-bridge rectifier, through pressing for IGBT provides galvanic current after capacitor C 1 filtering.Tank capacitance C9 and the upper oscillating circuit that forms of body of heater L of serial connection received in IGBT (Q1, Q2, Q3, Q4) output.
As shown in Figure 2, control circuit comprises PFM impulse controller, power regulation circuit and protective circuit; The mutual inductor sample signal is divided into two paths of signals, the one tunnel to IC5 (CD4046) phase-locked loop in order to follow the tracks of the L shaped resonant circuit frequency of oscillation variation that becomes of capacitor C 9 and body of heater.Another road compares computing through the set-point of operational amplifier IC1B and power adjustments, the 9th pin of operational amplifier IC1B output termination voltage controlled oscillator IC5 (CD4046), with control Phase Lock Loop IC 5(CD4046) output frequency, thereby the adjusting of the power output of finishing equipment.Foregoing circuit makes body of heater in the situation that the few material of many material can both keep constant power output.The 4th pin output frequency of voltage controlled oscillator IC5 is divided into two road signals behind the two-divider IC8 to be received OR circuit IC7 and forms dead-zone circuit with the RC circuit, and then outputs to drive plate.Wherein, the IC5 model is that CD4046 is a kind of phase-locked loop chip that carries voltage controlled oscillator, also is that order is worked as the most frequently used phase-locked loop chip, its steady quality, reliably, buying is convenient, for phase-locked loop or the voltage controlled oscillator of conveniently understanding in the present embodiment all refers to IC5 CD4046 chip.
As shown in Figure 3, drive circuit input and control circuit output carry out electrical isolation with electromagnetic coupler, are connected with logical circuit again, and logical circuit is connected with switching circuit, and wherein, switching circuit mainly is comprised of pliotron.
In addition, in the utility model, protective circuit mainly is made of comparator and amplifier.Be industry technology that the practitioner knows.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. an energy-saving high-power IGBT serial-resonant forges induction heater, comprises body of heater, also comprises rectification main circuit, inverter circuit master, control circuit and drive circuit; It is characterized in that, the three-phase main-frequency alternating current connects inverter circuit after by the rectification main circuit rectification, and described inverter circuit output connects body of heater and feeds back to control circuit by the instrument transformer sampling; Described control circuit is connected with drive circuit, and drive circuit and power model IGBT are connected to form a closed circuit; Described power model IGBT output is received the resonant capacitance (C9) and the upper oscillating circuit that forms of body of heater (L) of serial connection.
2. a kind of energy-saving high-power IGBT serial-resonant according to claim 1 forges induction heater, it is characterized in that, described control circuit comprises PFM impulse controller, power regulation circuit and protective circuit, the mutual inductor sample signal divides two the tunnel, one the tunnel follows the tracks of the power circuit oscillation frequency change to phase-locked loop chip (IC5), and another road is through the computing of making comparisons of operational amplifier (IC1B) and the set-point of power regulation circuit; The 9th pin of described operational amplifier (IC1B) output termination phase-locked loop chip (IC5) forges the power output of induction heating power device and regulates to serial-resonant; The 4th pin output frequency of described phase-locked loop chip (IC5) is divided into two paths of signals behind the two-divider (IC8) and receives OR circuit (IC7) and form dead-zone circuit with the RC circuit.
3. a kind of energy-saving high-power IGBT serial-resonant according to claim 1 forges induction heater, it is characterized in that, described drive circuit input is electrically connected with logical circuit by the electromagnetic coupler that is provided with the control circuit output, and described logical circuit is electrically connected with switching circuit.
4. a kind of energy-saving high-power IGBT serial-resonant according to claim 3 forges induction heater, it is characterized in that, described switching circuit is comprised of pliotron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220294570 CN202721845U (en) | 2012-06-20 | 2012-06-20 | Energy-saving type high-power IGBT series resonance type forging induction heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220294570 CN202721845U (en) | 2012-06-20 | 2012-06-20 | Energy-saving type high-power IGBT series resonance type forging induction heating furnace |
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| Publication Number | Publication Date |
|---|---|
| CN202721845U true CN202721845U (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220294570 Expired - Fee Related CN202721845U (en) | 2012-06-20 | 2012-06-20 | Energy-saving type high-power IGBT series resonance type forging induction heating furnace |
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| Country | Link |
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| CN (1) | CN202721845U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI678859B (en) * | 2019-05-13 | 2019-12-01 | 鴻齡科技股份有限公司 | Power supply device |
-
2012
- 2012-06-20 CN CN 201220294570 patent/CN202721845U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI678859B (en) * | 2019-05-13 | 2019-12-01 | 鴻齡科技股份有限公司 | Power supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20140620 |
|
| EXPY | Termination of patent right or utility model |