CN104423415A - High-power parallel and serial connection type resonance medium-frequency power source monitoring system - Google Patents
High-power parallel and serial connection type resonance medium-frequency power source monitoring system Download PDFInfo
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- CN104423415A CN104423415A CN201310405666.0A CN201310405666A CN104423415A CN 104423415 A CN104423415 A CN 104423415A CN 201310405666 A CN201310405666 A CN 201310405666A CN 104423415 A CN104423415 A CN 104423415A
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Abstract
The invention discloses a high-power parallel and serial connection type resonance medium-frequency power source monitoring system. The high-power parallel and serial connection type resonance medium-frequency power source monitoring system is characterized in that a PLC (programmable logic controller) control cabinet is connected with an HMI (human machine interface) of a touch screen, and is connected with a medium-frequency power source through an I/O (input/output) module, the PLC control cabinet is used for converting a signal by a D/A (digital/analog) module, and inputting into the medium-frequency power source by an amplifying driving circuit, the medium-frequency power source is connected with an induction furnace body A and an induction furnace body B, the medium-frequency power source is connected with a current sensor, a voltage sensor, a frequency sensor, a temperature sensor and a pressure sensor, and the signal is converted by the A/D module and then is inputted into the PLC control cabinet. The high-power parallel and serial connection type resonance medium-frequency power source monitoring system has the advantages that the operation is simple, the labor intensity of workers is decreased, the automation degree of smelting processing is improved, the control on load power of a melting furnace is realized, the service life of the furnace bodies is obviously prolonged, the metal smelting quality is obviously improved, and the dynamic and steady-state properties of the smelting process are improved.
Description
Technical field
The present invention relates to a kind of high-power parallel connection, series resonance intermediate frequency power supply supervisory system.
Background technology
High-power induction heating power has that firing rate is fast, workpiece is added evenly, adopts non-contact thermal, the easy plurality of advantages such as the automatic control of realization, have a wide range of applications in the industry, as being used for quenching, diathermanous, melting, insulation, soldering and sintering etc. at manufacturing industry and Metallurgy Industry.Along with the development of theories of induction heating and induction heating apparatus, its application also expands thereupon, and range of application is more and more wider.But existing technology, because Dynamic System is inconvenient, unstable properties, automatization level is low, cannot ensure the Melting Quality of metal.
Summary of the invention
For solving above-mentioned existing shortcoming, fundamental purpose of the present invention is the high-power parallel connection, the series resonance intermediate frequency power supply supervisory system that provide a kind of practicality, Dynamic System is simple, alleviate labor strength, improve the automatization level of melting processing, achieve the control to smelting furnace bearing power, the life-span of body of heater and the Melting Quality of metal are increased significantly, enhance the dynamic of fusion process and steady-state behaviour.
For reaching above-described object, following technical scheme is taked in the high-power parallel connection of one of the present invention, series resonance intermediate frequency power supply supervisory system:
A kind of high-power parallel connection, series resonance intermediate frequency power supply supervisory system, comprise induction body of heater A, induction body of heater B, intermediate frequency power supply, PLC control cabinet and touch-screen HMI, it is characterized in that, described PLC control cabinet is connected with touch-screen HMI, PLC control cabinet is connected with intermediate frequency power supply by I/O module, PLC control cabinet inputs intermediate frequency power supply through amplification driving circuit after signal is passed through D/A module converts, described intermediate frequency power supply and induction body of heater A and respond to body of heater B and be connected, intermediate frequency power supply and current sensor, voltage sensor, frequency sensor, temperature sensor is connected with pressure transducer, and input PLC control cabinet after being changed by signal by A/D module.
Described induction body of heater A and induction body of heater B is crucible, adopts fire resistive material to build up, the spiral inductive coil of outer surface cover one deck.
Described intermediate frequency power supply is powered for responding to body of heater by the mode of " AC-DC-AC ", and its electric current of intermediate frequency frequency exported is between 300Hz ~ 20KHz.
Adopt the present invention of as above technical scheme, there is following beneficial effect:
Dynamic System is simple, alleviates labor strength, improves the automatization level of melting processing, achieves the control to smelting furnace bearing power, increase significantly to the life-span of body of heater and the Melting Quality of metal, enhances the dynamic of fusion process and steady-state behaviour.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
Embodiment
In order to further illustrate the present invention, be described further below in conjunction with accompanying drawing:
As shown in Figure 1, the high-power parallel connection of one of the present invention, series resonance intermediate frequency power supply supervisory system, comprise induction body of heater A, induction body of heater B, intermediate frequency power supply, PLC control cabinet and touch-screen HMI, touch-screen HMI is connected with PLC control cabinet, PLC control cabinet is connected with intermediate frequency power supply by I/O module, PLC control cabinet inputs intermediate frequency power supply through amplification driving circuit after signal is passed through D/A module converts, intermediate frequency power supply and induction body of heater A and respond to body of heater B and be connected, intermediate frequency power supply and current sensor, voltage sensor, frequency sensor, temperature sensor is connected with pressure transducer, and input PLC control cabinet after being changed by signal by A/D module.Induction body of heater A and induction body of heater B is crucible, employing fire resistive material builds up, the spiral inductive coil of outer surface cover one deck, metal charge fusion is placed in crucible, when the logical upper alternating current of coil, the inside of metal charge produces eddy effect and magnetic hysteresis loss and causes thermal effect under the effect of alternating magnetic field, thus reaches the object adding hot smelting.Intermediate frequency power supply is by the mode of " AC-DC-AC " for induction body of heater is powered, and its electric current of intermediate frequency frequency exported is between 300Hz ~ 20KHz, and it is the main chief component of heating system, is main monitored object.PLC is the core cell of whole system, and its function gathers and completes the process of all analog quantitys and digital quantity, is responsible for the temperature acquisition of body of heater, the power of intermediate frequency power supply and heating process and controls, and realizes the communication with host computer touch-screen HMI.Touch-screen HMI is the monitor terminal of system man-machine interaction, both can the running status of display system real-time and accurately, can the running parameter of system be revised by touch-button and action command be assigned to equipment again, can also automatically by the warning message of system, historical record and tendency information stored in self-defining database.Induction heating power is generally made up of main circuit, control circuit and protection circuit thereof.Wherein main circuit comprises rectification circuit, filtering circuit, inverter circuit, load circuit composition.Three-phase main-frequency electric current, through rectifier rectification, after filter filtering, becomes straight DC current and gives inverter, then be converted to the electric current of intermediate frequency required for load circuit by inverter.The output of inverter circuit directly provides the energy for load.Electric current of intermediate frequency by inductive coil to workpiece heat time, can be equivalent to an inductance and resistance, load, in perception, in order to improve the output frequency of power factor and inverter, general adopts the method adding building-out capacitor, compensation back loading is operated in resonance frequency.According to the difference of building-out capacitor and load coil connected mode, power inverse transformation circuit can be divided into parallel resonance formula and serial-resonant two kinds of forms.Series-resonant inverting circuit, it is using the load as inverter bridge after building-out capacitor and induction coil (substitutional resistance and inductance) series connection.Because building-out capacitor value is comparatively large, can be similar to and thinks that inverter input terminal voltage immobilizes.The controllable devices alternately turned on and off on inverter just can obtain the square-wave voltage of alternation at the output terminal of inverter.During owing to adopting suitable working method when series inverter, switching loss is less, thus can have the frequency of operation of relative broad range.Just because of this reason, at present in semiconductor high-frequency induction heating power, series inverter scheme is subject to more attention.In heating and melting metal charge process, because of factors such as temperature variation and furnace charge dissolve, load equivalent parameter and natural resonance frequency are changed.In order to improve power-efficient should make series inverter always work in power factor close to or equal 1 quasi-resonance state, this will ask the output frequency of inverter can follow the change of load natural frequency, to realize Zero Current Switch or the zero voltage switch of inversion device.The voltage current waveform of PWM frequency tracking to load that the present invention adopts is sampled, the phase differential between voltage and current is obtained according to the position of zero crossing, the power factor that the system that obtains is real-time, regulates the frequency of operation of inverter with this, promote the power factor of induction furnace.
Claims (3)
1. a high-power parallel connection, series resonance intermediate frequency power supply supervisory system, comprise induction body of heater A, induction body of heater B, intermediate frequency power supply, PLC control cabinet and touch-screen HMI, it is characterized in that, described PLC control cabinet is connected with touch-screen HMI, PLC control cabinet is connected with intermediate frequency power supply by I/O module, PLC control cabinet inputs intermediate frequency power supply through amplification driving circuit after signal is passed through D/A module converts, described intermediate frequency power supply and induction body of heater A and respond to body of heater B and be connected, intermediate frequency power supply and current sensor, voltage sensor, frequency sensor, temperature sensor is connected with pressure transducer, and input PLC control cabinet after being changed by signal by A/D module.
2. the high-power parallel connection of one according to claim 1, series resonance intermediate frequency power supply supervisory system, is characterized in that, described induction body of heater A and induction body of heater B is crucible, adopts fire resistive material to build up, the spiral inductive coil of outer surface cover one deck.
3. the high-power parallel connection of one according to claim 1, series resonance intermediate frequency power supply supervisory system, it is characterized in that, described intermediate frequency power supply is powered for responding to body of heater by the mode of " AC-DC-AC ", and its electric current of intermediate frequency frequency exported is between 300Hz ~ 20KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310405666.0A CN104423415A (en) | 2013-09-09 | 2013-09-09 | High-power parallel and serial connection type resonance medium-frequency power source monitoring system |
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| CN201310405666.0A CN104423415A (en) | 2013-09-09 | 2013-09-09 | High-power parallel and serial connection type resonance medium-frequency power source monitoring system |
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| CN104423415A true CN104423415A (en) | 2015-03-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292521A (en) * | 2016-10-08 | 2017-01-04 | 南京三乐微波技术发展有限公司 | A kind of high power single-tube microwave power supply ageing behavior monitoring arrangement |
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2013
- 2013-09-09 CN CN201310405666.0A patent/CN104423415A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292521A (en) * | 2016-10-08 | 2017-01-04 | 南京三乐微波技术发展有限公司 | A kind of high power single-tube microwave power supply ageing behavior monitoring arrangement |
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Application publication date: 20150318 |