CN202998535U - An intermediate-frequency induction heating power supply - Google Patents
An intermediate-frequency induction heating power supply Download PDFInfo
- Publication number
- CN202998535U CN202998535U CN 201220744267 CN201220744267U CN202998535U CN 202998535 U CN202998535 U CN 202998535U CN 201220744267 CN201220744267 CN 201220744267 CN 201220744267 U CN201220744267 U CN 201220744267U CN 202998535 U CN202998535 U CN 202998535U
- Authority
- CN
- China
- Prior art keywords
- power supply
- signal
- circuit
- induction heating
- frequency induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- General Induction Heating (AREA)
- Inverter Devices (AREA)
Abstract
The utility model discloses an intermediate-frequency induction heating power supply comprising a three-phase power input end, a rectification circuit, an inverter circuit, and an intermediate-frequency transformer which are successively connected by a main circuit. An auxiliary power supply is connected with the main circuit and an IGBT driving circuit. The IGBT driving circuit is connected with the inverter circuit. The auxiliary power supply is also connected with a controller which is connected with a PWM controller, a signal acquiring module, and a man-machine interaction interface. The IGBT driving circuit is connected with the PWM controller. The beneficial effects of the intermediate-frequency induction heating power supply are that the output response of the intermediate-frequency induction heating power supply is fast, and that control of applications with strong current and high voltage and a fast terminal device is safe and fast, the applications such as the IGBT or the like.
Description
Technical field
The utility model relates to a kind of intermediate frequency induction heating power supply.
Background technology
The Frequency Induction Heating principle is to produce the electric current of alternation by rectification inverter circuit, thereby produces the magnetic field of alternation, and the recycling alternating magnetic field produces the effect that eddy current reaches heating.Utilize the amplitude-frequency characteristic of LC oscillating circuit electric current, can change fast the power output of intermediate frequency power supply by the resonance frequency that changes input circuit, thereby change fast workpiece surface temperature.Based on adding " kelvin effect principle " in theory of heat, when frequency is larger, skin depth is more shallow, its AC impedance is larger simultaneously, therefore under the function of current of identical numerical value, the energy that load obtains is also higher, and electric current and line loss correspondingly also can diminish, thereby improved the efficiency of heating surface, also can play simultaneously the purpose of saves energy.Intermediate frequency induction heating power supply just is being based on this principle and is making, and utilizes converter technique, running frequency can be brought up to the several times of power frequency, and heating effect can obviously improve.
Variable frequency heating power supply when work at first with three-phase alternating current through rectification, be filtered into direct current, then become the continuously adjustable single-phase electricity of frequency through inverter circuit, then after the intermediate frequency transformer isolation, be transported to heating cable and heat to workpiece.
At present, general intermediate frequency induction heating power supply is according to the difference of actual power and setting power, and the interval fixed cycle carries out a PID and adjusts.So the response time is longer, reach setting power slower, affected operating efficiency, and Systems balanth is not high.
Summary of the invention
For solving above technical deficiency, the utility model provides a kind of stability high, the intermediate frequency induction heating power supply of fast response time.
The utility model is realized by following measures:
A kind of intermediate frequency induction heating power supply of the present utility model comprises that the three-phase electricity that connects successively by main circuit is defeated
Enter end, rectification circuit, inverter circuit and intermediate frequency transformer, be connected to accessory power supply on main circuit, accessory power supply connects the IGBT drive circuit, the IGBT drive circuit connects inverter circuit, described accessory power supply also is connected to controller, described controller is connected with PWM controller, signal acquisition module and human-computer interaction interface, and described IGBT driver connects the PWM controller;
Described signal acquisition module is for switching value signal and environmentally sensitive signal on the resonance potential signal, resonance current signal and the main circuit that gather the three-phase electricity input;
Described controller is used under environmentally sensitive signal and the normal state of switching value signal, calculate actual power and relatively calculate with setting power according to the resonance potential signal and the resonance current signal that gather, by adjusting the PWM controller, make the power output of main circuit after commutation inversion near setting power.
Above-mentioned signal acquisition module is analog-to-digital conversion ADC module.
The beneficial effects of the utility model are: make the power stage response of intermediate frequency induction heating power supply rapider, and more safe and efficient to the control of the heavy currents such as IGBT, high voltage applications and fast terminal equipment.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Embodiment
A kind of intermediate frequency induction heating power supply of the present utility model comprises that the three-phase electricity that connects successively by main circuit is defeated
Enter end, rectification circuit, inverter circuit and intermediate frequency transformer, be connected to accessory power supply on main circuit, accessory power supply connects the IGBT drive circuit, the IGBT drive circuit connects inverter circuit, accessory power supply also is connected to controller, controller is connected with PWM controller, signal acquisition module and human-computer interaction interface, and the IGBT driver connects the PWM controller.
Signal acquisition module adopts analog-to-digital conversion ADC module, is used for gathering the resonance of three-phase electricity input
Switching value signal on voltage signal, resonance current signal and main circuit and environmentally sensitive signal.
Controller is used under environmentally sensitive signal and the normal state of switching value signal, calculate actual power and relatively calculate with setting power according to the resonance potential signal and the resonance current signal that gather, by adjusting the PWM controller, make the power output of main circuit after commutation inversion near setting power.
Comprise the following steps:
A. gather switching value signal and environmentally sensitive signal on resonance potential signal, resonance current signal and the main circuit of three-phase electricity input;
B. calculate the actual power of three-phase electricity input, and compare with setting power, calculate by increment type PID, calculate the step-length of the PWM load cycle that needs change, and then calculate with it the matching value of corresponding PWM comparator, remain unchanged in the process of frequency sweep with the duty ratio that guarantees the PWM output waveform;
C. the PWM controller flows to the IGBT drive circuit with pulse signal, and the IGBT drive circuit drives inverter circuit, makes the power output of main circuit after commutation inversion near setting power.
The medium-frequency induction heating power-supply system that is used for controlling due to this control technology adopts the series connection rectification inverter circuit, and input current equals output current, thereby the power output of thinking that can be similar to equals the input power of rectification front end.The resonance frequency that obtains by commutation inversion is the closer to the resonance point of resonant capacitance and the common resonant circuit that forms of workpiece, and resonance current is larger, and power output is just higher., move closer in the process of resonance point from reducing greatly gradually in resonance frequency, resonance current increases gradually, thereby power output increases gradually.If resonance frequency infinite approach resonance point, resonance current will be infinitely great so, will produce whole rectification inverter circuit to impact, so must guarantee that resonance frequency can not be unconfined near resonance point.
In the moment of beginning frequency sweep, the difference of actual power and setting power is larger, so the step value of the load cycle that the needs that calculate change is larger, to such an extent as to lower than the phenomenon of resonance point, the step-length maximum that the permission of reply load cycle changes is limited for the output frequency too rapidly that prevents frequency shift.In addition, the output frequency of resonant circuit approaches the process of resonance point from the right side, due to load cycle and the output frequency relation that is inversely proportional to, so when output frequency is smaller, the frequency of identical load cycle step-size change is less, and this has also increased this control system.
Can increase the ON time of rectification inverter circuit due to the duty ratio that increases the PWM output waveform, so for identical rectification inverter circuit, in the situation that resonance frequency remains unchanged, increase the duty specific energy and increase power output.
According to actual conditions, the ratio of increment of adjustment formula PID computing, integration, the corresponding parameter of differentiation element, until within output waveform can be stabilized in certain scope according to setting power, and when the resonance point of resonance inversion circuit changes, can make a response fast.
Common for fear of the inverter upper and lower bridge arm, the change of current must be followed principle that first closing has no progeny opens should keep certain dead band turn-offing and open between pulse.In addition, the duty ratio that increases the PWM output waveform on the basis of said process can reach the purpose that increases power, thereby realizes more powerful output.
The above is only the preferred implementation of this patent; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the art of this patent principle; can also make some improvement and replacement, these improvement and replacement also should be considered as the protection range of this patent.
Claims (2)
1. intermediate frequency induction heating power supply, comprise the three-phase electricity input, rectification circuit, inverter circuit and the intermediate frequency transformer that connect successively by main circuit, be connected to accessory power supply on main circuit, accessory power supply connects the IGBT drive circuit, the IGBT drive circuit connects inverter circuit, it is characterized in that: described accessory power supply also is connected to controller, and described controller is connected with PWM controller, signal acquisition module and human-computer interaction interface, and described IGBT driver connects the PWM controller;
Described signal acquisition module is for switching value signal and environmentally sensitive signal on the resonance potential signal, resonance current signal and the main circuit that gather the three-phase electricity input;
Described controller is used under environmentally sensitive signal and the normal state of switching value signal, calculate actual power and relatively calculate with setting power according to the resonance potential signal and the resonance current signal that gather, by adjusting the PWM controller, make the power output of main circuit after commutation inversion near setting power.
2. intermediate frequency induction heating power supply according to claim 1, it is characterized in that: described signal acquisition module is analog-to-digital conversion ADC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220744267 CN202998535U (en) | 2012-12-31 | 2012-12-31 | An intermediate-frequency induction heating power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220744267 CN202998535U (en) | 2012-12-31 | 2012-12-31 | An intermediate-frequency induction heating power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202998535U true CN202998535U (en) | 2013-06-12 |
Family
ID=48569658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220744267 Expired - Fee Related CN202998535U (en) | 2012-12-31 | 2012-12-31 | An intermediate-frequency induction heating power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202998535U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103024957A (en) * | 2012-12-31 | 2013-04-03 | 山东彼岸电力科技有限公司 | Medium-frequency induction heating power source and control method thereof |
-
2012
- 2012-12-31 CN CN 201220744267 patent/CN202998535U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103024957A (en) * | 2012-12-31 | 2013-04-03 | 山东彼岸电力科技有限公司 | Medium-frequency induction heating power source and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103024957A (en) | Medium-frequency induction heating power source and control method thereof | |
| CN203840210U (en) | AC inverter circuit | |
| CN204216790U (en) | A kind of scanning power supply able to programme | |
| CN105486101A (en) | Controllable inversion high-temperature furnace | |
| CN102377385B (en) | Bypass variable-frequency controller with phase detection | |
| CN103944422A (en) | High-frequency power supply for electrostatic precipitator | |
| KR101738796B1 (en) | Controlling a voltage-adapting electronic module | |
| CN201967167U (en) | Induction heating dual-cycle controller | |
| CN202998535U (en) | An intermediate-frequency induction heating power supply | |
| CN203104294U (en) | Modularized highly efficient DC/DC converter | |
| CN102386800B (en) | Low-voltage heavy-current high-power pulse power supply | |
| CN201928192U (en) | Single-phase AC (alternating current) voltage regulation circuit | |
| CN101969302A (en) | Novel switch resonant power ultrasonic generating circuit | |
| CN204669243U (en) | The soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage | |
| CN205004959U (en) | Industry resistance furnace control by temperature change frequency control device | |
| CN203261240U (en) | High-frequency high-voltage soft stabilizing power supply used for electrostatic dust collector | |
| CN105024396A (en) | Energy feedback frequency converter | |
| CN204014133U (en) | A kind of electromagnetic heating circuit | |
| CN203827208U (en) | Electrostatic dust remover high frequency power supply | |
| CN208571967U (en) | A kind of intelligence control system of excitation chopper | |
| CN201918905U (en) | Three-phase AC voltage regulation circuit with single controllable tube | |
| CN103051169B (en) | A kind of reactive power control method of inversion topological circuit | |
| CN107134932A (en) | A kind of micro-wave oven variable-frequency power sources | |
| CN202617022U (en) | Voltage adjustable circuit of electromagnetic oven | |
| CN201409115Y (en) | Energy-saving control device of speed regulator of single-phase motor |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20211231 |