CN201315678Y

CN201315678Y - Electromagnetic variable frequency energy-saving controller for heating system

Info

Publication number: CN201315678Y
Application number: CNU2008201891836U
Authority: CN
Inventors: 颜晓英; 张元�
Original assignee: Dongguan Woomi Power Tech Co Ltd
Current assignee: Dongguan Woomi Power Tech Co Ltd
Priority date: 2008-08-27
Filing date: 2008-08-27
Publication date: 2009-09-23
Anticipated expiration: 2018-08-27

Abstract

The utility model relates to an electromagnetic variable frequency energy-saving controller for a heating system, which comprises an inverter power source main circuit, an auxiliary circuit and a master control circuit. The inverter power source main circuit is formed in following mode: after being filtered by an EMI filter, three phase (or single-phase) AC city electricity is rectified by a rectifier bridge module U, and then is filtered by a capacitance, and at last is added to the bridge inverter circuit which consists of IGBT. The DC high voltage is inverted into a high-frequency impulse wave by the inverter circuit, wherein the impulse width of the high-frequency impulse wave varies according to the sine wave regulation. Then high-frequency harmonic is filtered by an output filter to obtain a mid frequency sine wave. Finally the mid frequency sine wave is separated and transformed by a transformer, and then is provided to a load. The controller has the advantages of long service life, quick heating rate, no maintenance and the like, and shortens maintenance time and reduces cost. Now the electromagnetic variable frequency energy-saving controller for the heating system can be used by vast plastics enterprises, thereby greatly reducing the production cost of the enterprises.

Description

Heating system electromagnetism energy-saving and frequency-variable controller

Technical field

The utility model relates to heating system electromagnetism frequency conversion control technique, relates in particular to heating system electromagnetism energy-saving and frequency-variable controller.

Background technology

In our life and activity in production, many times all to use heating.Electric heating is the most general mode, and comparatively general with the resistance wire heating in this mode of electric heating.But the resistance wire heating, its heat efficiency is very low, and has many other shortcomings concurrently.At present, the production equipment of manufacturing enterprises such as domestic plastic products, plastic film, plastic granulating, wire drawing injection moulding, tubing all is to adopt electric heating coil that barrel and die head are heated more than 90 percent, injection molding, stretching again after the plastic raw materials fusion is plastified, extrusion molding is a product.With various heating plates, the circle that resistance wire is made, there is the problem of following several respects by the contact conduction pattern:

1. thermal loss is big: the mode of heating that existing enterprise adopts is by the resistance wire coiling, the inside and outside two-sided heating of circle, and the heat conduction of its inner face (being close to the barrel part) is to barrel, and the heat major part of outside is lost in the air, causes the loss and waste of electric energy.

2. ambient temperature rises: because heat scatters and disappears in a large number, ambient temperature is very big to the production environment influence in rising, especially summer, and the work on the spot temperature has all surpassed 45 ℃, and some enterprise has to adopt air-conditioning to reduce temperature, and this causes the secondary waste of the energy again.

3. useful life is short, maintenance capacity is big: adopt the resistance wire heating, when its heating-up temperature reached 800 ℃, resistance wire can Yin Gaowen and blow, and therefore, the workload of maintenance is relatively large about about half a year useful life for electric heating coil commonly used.

4. it is exactly that power density is low that other resistance wire heating also has a shortcoming, needs the higher heating occasion of temperature just can't adapt at some.

The utility model content

The utility model provides a kind of heating system electromagnetism energy-saving and frequency-variable controller at the above-mentioned defective of prior art, to save the energy.

Make metal barrel self-heating by electromagnetic induction principle, and can so just significantly reduce scattering and disappearing of heat as the case may be at the certain thickness heat-insulation and heat-preservation material of barrel outer wrap, improve the heat efficiency, therefore power savings is very remarkable, can reach 30%～75%.Because the electromagnetism heating collar itself does not generate heat, and be to adopt insulating material and high-temperature cable manufacturing, so do not exist resistance wire oxidation and problem of reduction of service life under the condition of high temperature of the former electric heating coil of picture, have long service life, heating rate fast, advantage such as need not keep in repair, reduce maintenance time, reduced cost.Now used by manufacturing enterprises such as vast domestic plastic products, plastic film, plastic granulating, wire drawing injection moulding, tubing, reduced the production cost of enterprise greatly.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

Heating system electromagnetism energy-saving and frequency-variable controller comprises inverter main circuit, auxiliary circuit, governor circuit composition; Described inverter main circuit be with electric main after electromagnetic interface filter filtering, by rectifier bridge module U rectification, again through capacitor filtering, add to the bridge inverter main circuit that constitutes by IGBT, this high direct voltage is the high-frequency impulse ripple that pulsewidth changes by sinusoidal wave rule through the inverter circuit inversion, filter high-frequency harmonic by output filter again, obtain middle frequency sine-wave, at last by offering load after transformer isolation, the transformation; Main control circuit produces and according to exporting the width that feedback voltage and feedback current change impulse wave, guarantees the stable of output voltage; The control signal that described auxiliary circuit sends according to governor circuit guarantees main circuit according to correct sequence power on, and feedback voltage, electric current are carried out monitoring, alarming.

Preferably, described bridge inverter main circuit V1, V2, V3, V4 are made up of 4 IGBT modules.

Preferably, governor circuit by 16 single-chip microcomputer 87C196MC as control core.

As can be seen from the above technical solutions, the utility model produces the Supersonic high frequency magnetic field by advanced Circuits System in heated metal inside, high frequency magnetic field produces the high frequency electric knife collision according to the high-frequency induction principle in heated metal inside, thereby producing heat rises the metal barrel temperature rapidly, owing to be the high-frequency induction principle, the high frequency coil discord is heated metal and directly contacts, so the thermal radiation temperature of system own is near ambient temperature, have only below 50 ℃, human body can touch fully.It with heat imitate high, heating is fast, important effect is being brought into play in power and energy saving, plurality of advantages such as safe and reliable in our daily life,

Description of drawings

Fig. 1 is the whole block diagram of the utility model;

Fig. 2 is the utility model schematic diagram;

Fig. 3 is the utility model main control circuit schematic diagram.

Embodiment

Below in conjunction with embodiment the utility model is described in further detail.

Shown in Fig. 1,2,3, the utility model forms 3 by inverter main circuit 1, auxiliary circuit 2, governor circuit; Described inverter main circuit 1, K1 are air switch, and L is an electromagnetic interface filter, in order to filter the interference in the electrical network and to eliminate the interference of inverter to electrical network; K2; K3; K4 is a contactor; the effect of K2 is an energized when system start-up; when fault, cut off main power source; its auxiliary contact K2-1 is used for shutting down or the energy of storing on filter capacitor C1 and the C2 being bled off fast during the protective circuit action by resistance R 2, so that maintenance or the energy built up among capacitor C 1 and the C2 when avoiding power down have not also been put, damages because of uncertain the generations while conducting of driving pulse level with the main up and down power IGBT of brachium pontis in the inverter bridge.Contactor K3 and resistance R 1 constitute soft starting circuit, its effect is when system start-up, lentamente capacitor C 1 and C2 are charged by resistance R 1, when preventing from directly to start because capacitor C1 and C2 go up initial voltage is zero, cause the rectifier bridge module to bear excessive rush of current and damage, when the voltage on capacitor C 1 and the C2 is charged to certain value, contactor K3 action, its contact is with resistance R 1 short circuit.K4 is used for power supply output is separated with load, load is connected after the system start-up success, to guarantee that power-supply system starts smoothly and the protection power consumption equipment again.Filter capacitor C1 and C2 are used for the voltage after the rectification is carried out filtering, and the voltage that offers inverter bridge with assurance is straight direct voltage.R3 and R4 be respectively and in C1 and C2 two ends, respectively bears half of direct voltage in the main circuit to guarantee C1 and C2; S is a Hall current sensor, leading directly to of inverter is reached short-circuit protection a sampled signal is provided; V1～V4 is 4 IGBT, constitutes bridge inverter main circuit.C3 and C4 are used for suppressing in the IGBT make and break process peaking voltage Ldi/dt that the existence because of inductance in the circuit causes, guarantee that primary power switch device IGBT is not because of bearing too high peaking voltage punch through damage.L1, L2, C5 constitutes output filter, the high-frequency impulse ripple by sinusoidal wave rule variation pulsewidth of inverter bridge output is reduced into the intermediate frequency sinewave output, and the voltage of suitable amplitude is provided for load after transformer T1 isolates.

Described auxiliary circuit 2 comprises that auxiliary control circuit, display screen reach by key control, power supply, drive circuit composition; Described auxiliary control circuit is the control signal of sending according to governor circuit, control contactor K2 successively, and K3, the adhesive of K4 and disjunction guarantee main circuit according to correct sequence power on, the power supply of cut-out main circuit when protective circuit work.It is under the control of governor circuit that described display screen reaches by key control, the operating state of display system, as voltage, electric current, frequency etc., and can (the change scope be rated output voltage and frequency output voltage by the key change amplitude of output voltage, when system breaks down, fault is shown and reports to the police that alarm signal comprises overcurrent, overload, short circuit, overheated, input over-and under-voltage, drive and report to the police etc.Described power supply provides working power for main control circuit and peripheral circuit.Described drive circuit provides driving voltage for the grid of IGBT, and the performance of drive circuit not only is directly connected to the service behaviour and the security of operation of IGBT device itself, and has influence on the performance and the safety of whole system.

Described governor circuit forms 3, and it adopts 16 single-chip microcomputer 87C196MC of INTEL Corp. as the control core.This single-chip microcomputer is mainly used in control and data processing, and has the pulse-width signal output port.On control algolithm, adopt FUZZY ALGORITHMS FOR CONTROL.It is the SPWM pulse signal of 20kHz that single-chip microcomputer produces carrier frequency, export by the pulse-width signal output port, be added to the grid of IGBT by drive circuit, the control inverter circuit is correctly worked, simultaneously, adjust the pulsewidth of SPWM pulse signal to keep the stable of amplitude output signal according to the value of feedback of voltage and current.Move reliably in order to guarantee system safety, give full play to the powerful controlled function of single-chip microcomputer, by Primary Component and the key parameter of main control circuit to system, for example overvoltage, under-voltage, overcurrent, overload, output short-circuit, overheated etc. monitored in real time, realizes carrying out corresponding sound and light alarm to the self diagnosis of working state of system and to fault.Owing to adopted the control core of 16 single-chip microcomputers as system, control quick and precisely, it is fast to make system have a response, stable, reliable characteristics.

Preferably, formation bridge inverter main circuit V1, V2, V3, V4 are made up of 4 IGBT modules in the described inverter main circuit.

The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims

1, heating system electromagnetism energy-saving and frequency-variable controller, it is characterized in that: comprise inverter main circuit, auxiliary circuit, governor circuit, inverter main circuit, auxiliary circuit are connected with governor circuit respectively, auxiliary circuit is connected with the inverter main circuit again, and described inverter main circuit provides power supply for governor circuit and load; Governor circuit sends instruction to auxiliary circuit, and auxiliary circuit is regulated control according to the control command that governor circuit sends to the inverter main circuit; The inverter main circuit is connected and composed successively by electromagnetic interface filter, filter capacitor, bridge inverter main circuit, output filter, transformer.

2, according to the heating system electromagnetism energy-saving and frequency-variable controller shown in the claim 1, it is characterized in that: governor circuit by 16 single-chip microcomputer 87C196MC as control core.