CN201387455Y - High-efficiency electro-magnetic cooker energy-saving burning device - Google Patents
High-efficiency electro-magnetic cooker energy-saving burning device Download PDFInfo
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- CN201387455Y CN201387455Y CN200920051270U CN200920051270U CN201387455Y CN 201387455 Y CN201387455 Y CN 201387455Y CN 200920051270 U CN200920051270 U CN 200920051270U CN 200920051270 U CN200920051270 U CN 200920051270U CN 201387455 Y CN201387455 Y CN 201387455Y
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Abstract
The utility model relates to the technical field of energy-saving electronic products, in particular to a high-efficiency electro-magnetic cooker energy-saving burning device; the device comprises a magnet exciting coil, and a high-frequency filtering circuit, a low-frequency rectifying circuit, a low-frequency PFC converting circuit, a direct voltage synthesis circuit and a DC/AC inversion circuit which are sequentially connected; the device also comprises a high-frequency voltage coupling and rectifying circuit, a high-frequency PFC converting circuit, a DSP control circuit for controlling the DC/AC inversion circuit and the high-frequency PFC converting circuit, the input end of the high-frequency voltage coupling and rectifying circuit is connected with the output end of the magnet exciting coil, the output end of the high-frequency voltage coupling and rectifying circuit is connected with the voltage input end of the high-frequency PFC converting circuit, the output end of the high-frequency PFC converting circuit is connected with the feedback voltage input end of the direct voltage synthesis circuit; the utility model can improve the stability of the direct voltage feedback to the DC/AC inversion circuit, thereby improving the converting efficiency of electromagnetic energy to electrical energy of the whole device.
Description
Technical field:
The utility model relates to the energy-saving electric product technical field, the energy-conservation burn-in device of especially a kind of electromagnetic oven efficiently.
Background technology:
Whether electromagnetic oven must be tested (claim aging test again, generally carried out two hours) through strict burning machine in process of production, normal with electric property and the work of checking out this electromagnetic oven.Produce the manufacturer of electromagnetic oven at present, great majority are to use corresponding electromagnetic oven pan to add water and simulate the test of burning machine, the manufacturer that also has is put in the bulk magnetic holding plate to simulate the test of burning machine on the electromagnetic oven, this dual mode has consumed a large amount of electric energy and water in vain in burning the machine process, make the production firm of electromagnetic oven not only will pay very big electricity charge spending for this reason, and its environment that burns machine testing laboratory can become very moist because of a large amount of water vapours, is unfavorable for the production of electromagnetic oven.
In order to overcome above-mentioned shortcoming, someone has designed the energy-conservation burn-in device of electromagnetic oven, it as the China Patent No. of my previous application 200720061441.8 the energy-conservation burn-in device of electromagnetic oven, it is mainly by field coil, the high frequency booster circuit, rectifier filter circuit, circuit such as DC/AC (direct current commentaries on classics alternating current) inverter circuit constitute, the field coil of the energy-conservation burn-in device of this electromagnetic oven can burn electromagnetic oven the electromagnetic energy that produces in the machine process and be converted into electric energy, after the processing through high frequency booster circuit and rectifier filter circuit, most electric energy is fed back to the alternating current input end of electromagnetic oven by the DC/AC inverter circuit, electric energy is provided promptly for again the burning machine, burn the electric energy that is consumed in the machine process thereby reduce electromagnetic oven, reach the purpose of energy-conservation burning machine.The energy-conservation burn-in device of this kind electromagnetic oven, it has overcome above-mentioned shortcoming to a certain extent, but still the not enough place of existence, the voltage of exporting because of its field coil only passes through high frequency booster circuit and rectifier filter circuit simple process, make that the DC voltage feed back to the DC/AC inverter circuit is stable inadequately, it is lower to cause the electromagnetic energy of whole device to be converted into the conversion efficiency of electric energy.
The utility model content:
The purpose of this utility model is exactly to provide a kind of electromagnetic oven efficiently energy-conservation burn-in device at the deficiency of prior art existence, and it is by the DC voltage of stabilized feedback, thereby the raising electromagnetic energy is converted into the conversion efficiency of electric energy.
To achieve these goals, the technical solution adopted in the utility model is:
It comprises field coil, the high-frequency filter circuit of Lian Jieing successively, the low frequency rectification circuit, low frequency PFC (Power Factor Correction, power factor correction) change-over circuit, the DC voltage combiner circuit, the DC/AC inverter circuit, also comprise HF voltage coupling and rectification circuit, high frequency PFC change-over circuit, DSP (Digital Signal Processor, digital signal processor) control circuit, the input end of described HF voltage coupling and rectification circuit is connected with the output terminal of field coil, the output terminal of HF voltage coupling and rectification circuit is connected with the voltage input end of high frequency PFC change-over circuit, and the output terminal of high frequency PFC change-over circuit is connected with the feedback voltage input end of DC voltage combiner circuit; The control output end of DSP control circuit is connected with the control input end of DC/AC inverter circuit, the control input end of high frequency PFC change-over circuit respectively, is used to control DC/AC inverter circuit and high frequency PFC change-over circuit.
Further comprise the feedback current limit circuit, high-frequency rectification circuit, startup fictitious load and the control circuit that are used to control the feedback size of current, the voltage input end of described feedback current limit circuit is connected with the output terminal of high frequency PFC change-over circuit, and the output terminal of feedback current limit circuit is connected with the feedback voltage input end of DC voltage combiner circuit; The input end of described high-frequency rectification circuit is connected with the output terminal of field coil, and the output terminal of high-frequency rectification circuit is connected with the input end that starts fictitious load and control circuit; The control output end of described DSP control circuit is connected with the control input end of feedback current limit circuit, the control input end that starts fictitious load and control circuit respectively, is used to control feedback current limit circuit and startup fictitious load and control circuit.
Described DSP control circuit comprises the sinusoidal wave inverter circuit of DSP isolation drive, DSP isolation drive current limit circuit, DSP isolation drive start-up circuit, the sinusoidal wave inverter circuit of DSP isolation drive is connected with the control input end of DC/AC inverter circuit, is used to control the DC/AC inverter circuit; DSP isolation drive current limit circuit is connected with the control input end of feedback current limit circuit, is used to control the feedback current limit circuit; DSP isolation drive start-up circuit is connected with the control input end that starts fictitious load and control circuit, is used for control and starts fictitious load and control circuit.
Described HF voltage coupling and rectification circuit are made up of capacitor C 8 and bridge rectifier BD2, the end of C8 is connected with the 1st pin of BD2, the other end is connected with an end of field coil, the other end of field coil is connected with the 3rd pin of BD2, the 2nd pin of BD2 is the cathode voltage output terminal of HF voltage coupling and rectification circuit, and the 4th pin of BD2 is the cathode voltage output terminal of HF voltage coupling and rectification circuit.
Described high frequency PFC change-over circuit comprises the PFC control circuit, field effect transistor Q5, diode D3, inductance L 6, resistance R 2, R3, R4, capacitor C 9, C10, cathode voltage input end, cathode voltage input end; Wherein, the cathode voltage input end is connected with the cathode voltage output terminal with the cathode voltage output terminal of HF voltage coupling and rectification circuit respectively with the cathode voltage input end; C9 is preceding filter capacitor, and it is connected between the cathode voltage input end and cathode voltage input end of high frequency PFC change-over circuit; The end of L6 is connected with the cathode voltage input end, and the other end is connected with the anode of D3, and the negative electrode of D3 is the voltage output end of high frequency PFC change-over circuit; The positive pole of C10 is connected with the negative electrode of D3, and the negative pole of C10 is connected with the 3rd ground connection; The end of R3 is connected with the negative electrode of D3, and the other end is connected with the end of R4, and the other end of R4 is connected with the 3rd ground connection; The 1st pin of field effect transistor Q5 is connected with the anode of D3, and the 2nd pin is connected with the 3rd ground connection, and the 3rd pin is connected with the 2nd pin of PFC control circuit; The 1st pin of PFC control circuit is a power input, and the 3rd pin is connected with contact between R3, the R4, and the 4th pin is connected with the 3rd ground connection, and the 5th pin is connected with the cathode voltage input end; R2 is connected between the 4th pin and the 5th pin of PFC control circuit.
The voltage output end of described low frequency PFC change-over circuit is connected with auxiliary power circuit, and this auxiliary power circuit is used to each circuit that working power is provided.
Described field coil is made up of disc coil and high frequency magnetic stripe, and the disc coil is to be formed by some bursts of enameled wire coilings.
The utility model beneficial effect is:
The energy-conservation burn-in device of electromagnetic oven efficiently that the utility model provides, because the raising power factor of the voltage process HF voltage coupling of field coil output and the capacitive coupling of rectification circuit and rectified action, high frequency PFC change-over circuit, make the dc voltage stability raising feed back to the DC/AC inverter circuit, thereby the electromagnetic energy that improves whole device is converted into the conversion efficiency of electric energy.
Description of drawings:
Fig. 1 is a block diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of the utility model high-frequency filter circuit, low frequency rectification circuit, low frequency PFC change-over circuit, DC voltage combiner circuit, DC/AC inverter circuit, the sinusoidal wave inverter circuit of DSP isolation drive and auxiliary power circuit;
Fig. 3 is the circuit theory diagrams of the utility model field coil, HF voltage coupling and rectification circuit, high frequency PFC change-over circuit, feedback current limit circuit, high-frequency rectification circuit, startup fictitious load and control circuit, DSP isolation drive current limit circuit and DSP isolation drive start-up circuit.
Embodiment:
Below in conjunction with accompanying drawing the utility model is further described, please refer to Fig. 1, the utility model comprises field coil 7, high-frequency filter circuit 1, low frequency rectification circuit 2, low frequency PFC change-over circuit 3, DC voltage combiner circuit 4, DC/AC inverter circuit 5, HF voltage coupling and rectification circuit 8, high frequency PFC change-over circuit 9, DSP control circuit 12, wherein, the input end of high-frequency filter circuit 1 is connected with electrical network, for the utility model provides AC power; High-frequency filter circuit 1, low frequency rectification circuit 2, low frequency PFC change-over circuit 3, DC voltage combiner circuit 4 and DC/AC inverter circuit 5 are for being connected successively, the output terminal that is high-frequency filter circuit 1 is connected with the input end of low frequency rectification circuit 2, the output terminal of low frequency rectification circuit 2 is connected with the input end of low frequency PFC change-over circuit 3, the output terminal of low frequency PFC change-over circuit 3 is connected with the input end of DC voltage combiner circuit 4, the output terminal of DC voltage combiner circuit 4 is connected with the input end of DC/AC inverter circuit 5, like this, the alternating current of electrical network input, filtering through high-frequency filter circuit 1, after the power factor correction of the rectification of low frequency rectification circuit 2 and low frequency PFC change-over circuit 3, become galvanic current, and inputed in the DC voltage combiner circuit 4; The output terminal of DC/AC inverter circuit 5 then is connected with the power input that is burnt machine electromagnetic oven 6, for electromagnetic oven provides the burning machine required electric energy; Simultaneously, in the present embodiment, the input end of described HF voltage coupling and rectification circuit 8 is connected with the output terminal of field coil 7, the output terminal of HF voltage coupling and rectification circuit 8 is connected with the voltage input end of high frequency PFC change-over circuit 9, the output terminal of high frequency PFC change-over circuit 9 is connected with the feedback voltage input end of DC voltage combiner circuit 4, like this, the alternating current of field coil 7 outputs, capacitive coupling and rectified action through HF voltage coupling and rectification circuit 8, after the power factor correction of high frequency PFC change-over circuit 9, become galvanic current, this direct current is as busbar voltage, feed back in the DC voltage combiner circuit 4, by DC voltage combiner circuit 4 electric energy of feedback and the electric energy of electrical network input are synthesized one road direct current again, send into the input end of DC/AC inverter circuit 5, by exporting to of DC/AC inverter circuit 5 by the power input of burning machine electromagnetic oven 6, for electromagnetic oven provides the burning machine required electric energy; The control output end of described DSP control circuit 12 is connected with the control input end of DC/AC inverter circuit 5, the control input end of high frequency PFC change-over circuit 9 respectively, is used to control DC/AC inverter circuit 5 and high frequency PFC change-over circuit 9.
The utility model further comprises feedback current limit circuit 10, high-frequency rectification circuit 13, startup fictitious load and the control circuit 14 that is used to control the feedback size of current, the voltage input end of described feedback current limit circuit 10 is connected with the output terminal of high frequency PFC change-over circuit 9, and the output terminal of feedback current limit circuit 10 is connected with the feedback voltage input end of DC voltage combiner circuit 4; The input end of described high-frequency rectification circuit 13 is connected with the output terminal of field coil 7, and the output terminal of high-frequency rectification circuit 13 is connected with the input end that starts fictitious load and control circuit 14; The control output end of described DSP control circuit 12 is connected with the control input end of feedback current limit circuit 10, the control input end that starts fictitious load and control circuit 14 respectively, is used to control feedback current limit circuit 10 and startup fictitious load and control circuit 14.Wherein, described feedback current limit circuit 10 has current limit function, can guarantee to be burnt the normal startup and the work of machine electromagnetic oven 6, because when the electromagnetic oven operate as normal, if its load is increased suddenly or reduces suddenly, the capital makes electromagnetic oven enter the shutdown guard mode, therefore busbar voltage feeds back to that the electric current of DC/AC inverter circuit 5 will increase gradually, just can not make electromagnetic oven enter the shutdown guard mode, and DSP control circuit 12 can be controlled size of current and the speed that busbar voltage feeds back to DC/AC inverter circuit 5 by control feedback current limit circuit 10, makes electromagnetic oven keep operate as normal; Described startup fictitious load and control circuit 14, can realize loading and unloading to starting fictitious load by the working method of electronic switch, and can realize in various degree loading, because after the output power of electromagnetic oven will reach certain power, the ability operate as normal, so DSP control circuit 12 removes the startup fictitious load, again in order to avoid consume extra electric energy after can starting electromagnetic oven by control startup fictitious load and control circuit 14.
The DSP control circuit 12 of present embodiment, be a kind of fast operation, processing capacity is strong, memory size is big chip microprocessor, collection sampling by electric parameters such as electric current, voltage, temperature, functional switch, time are provided with, be equipped with corresponding software, can drive startup fictitious load and control circuit 14, DC/AC inverter circuit 5 and the work schedule of control high frequency PFC change-over circuit 9, the work schedule that suppresses in-rush current limiting circuit, duty indication, time circuit, warning circuit etc.; In this enforcement, described DSP control circuit 12 comprises the sinusoidal wave inverter circuit 121 of DSP isolation drive, DSP isolation drive current limit circuit 122, DSP isolation drive start-up circuit 123, the sinusoidal wave inverter circuit 121 of DSP isolation drive is connected with the control input end of DC/AC inverter circuit 5, is used to control DC/AC inverter circuit 5; DSP isolation drive current limit circuit 122 is connected with the control input end of feedback current limit circuit 10, is used to control feedback current limit circuit 10; DSP isolation drive start-up circuit 123 is connected with the control input end that starts fictitious load and control circuit 14, is used for control and starts fictitious load and control circuit 14.
" low frequency " in the present embodiment low frequency PFC change-over circuit 3 is meant that the frequency of the dc pulse moving voltage before its conversion process is below 200Hz, " high frequency " in the described high frequency PFC change-over circuit 9 is meant that the frequency of the dc pulse moving voltage before its conversion process is surpassing more than the 10KHz, and " high frequency " in the described high-frequency rectification circuit 13 is that the frequency of alternating voltage is surpassing more than the 10KHz; Described low frequency PFC change-over circuit 3 and high frequency PFC change-over circuit 9 all belong to circuit of power factor correction, it can force the phase differential of input voltage and electric current to approach zero, also promptly to improve power factor and approach 1, the effect of low frequency PFC change-over circuit 3 is the utilization ratios that improve the electrical network electric energy, minimizing is to the pollution of electrical network, the effect of high frequency PFC change-over circuit 9 is the utilization ratios that improve the induction electric energy (being feedback electric energy) of field coil 7 outputs, exchanges stable busbar voltage simultaneously for.
The voltage output end of present embodiment low frequency PFC change-over circuit 3 is connected with auxiliary power circuit 11, and this auxiliary power circuit 11 is used to each circuit that working power is provided.
The field coil 7 of present embodiment is made up of disc coil and high frequency magnetic stripe, the disc coil is to be formed by some bursts of enameled wire coilings, certainly, described field coil 7 is and the coil coupling of being burnt machine electromagnetic oven 6 inside, when the coil that is burnt machine electromagnetic oven 6 inside has electric current to pass through, described field coil 7 can be responded to, and has HF voltage to produce.
The utility model in use, described field coil 7 is to be placed on the ceramic microcrystalline plate that is burnt machine electromagnetic oven 6, the input end of high-frequency filter circuit 1 is connected with electrical network, when being begun burning machine (promptly aging) by burning machine electromagnetic oven 6, described field coil 7 can be responded to the electric current of the coil that is burnt machine electromagnetic oven 6 inside, and generation high-frequency ac voltage, this high-frequency ac voltage is through the capacitive coupling and the rectified action of HF voltage coupling and rectification circuit 8, after the power factor correction of high frequency PFC change-over circuit 9, become galvanic current, this direct current is as busbar voltage, feed back in the DC voltage combiner circuit 4, by DC voltage combiner circuit 4 electric energy of feedback and the electric energy of electrical network input are synthesized one road direct current again, send into the input end of DC/AC inverter circuit 5, by exporting to of DC/AC inverter circuit 5 by the power input of burning machine electromagnetic oven 6, for electromagnetic oven provides the burning machine required electric energy; Because the high-frequency ac voltage of field coil 7 outputs, after the raising power factor of the capacitive coupling of coupling of process HF voltage and rectification circuit 8 and rectified action, high frequency PFC change-over circuit 9, make that the DC voltage that feeds back to DC/AC inverter circuit 5 conversion efficiency stable more, that the utility model electromagnetic energy is converted into electric energy is higher.
Please refer to Fig. 2,3, be physical circuit figure of the present utility model.Described high-frequency filter circuit 1 is made up of R1, C1, C2, C3, C4, C5, L1, L2 etc., and the input end L end of high-frequency filter circuit 1 is connected with the live wire of electrical network, the N end is connected with the zero line of electrical network, the G end is connected with the ground wire of electrical network and form first ground connection (GND1); Low frequency rectification circuit 2 is bridge rectifier BD1, and low frequency PFC change-over circuit 3 is PFC change-over circuit commonly used, the therefore detailed structure of not drawing low frequency PFC change-over circuit 3; DC voltage combiner circuit 4 is made of diode D1 and D2, the anode of D1 is connected with the voltage output end (VBUS1) of low frequency PFC change-over circuit 3, the anode of D2 is connected with the voltage output end (VBUS2) of high frequency PFC change-over circuit 9, the negative pole of D1 is connected with the D2 negative pole, the voltage output end (VBUS3) of forming DC voltage combiner circuit 4, the voltage of high frequency PFC change-over circuit 9 voltage output ends will be higher than more than the voltage 5V of low frequency PFC change-over circuit 3 voltage output ends, can be added to the power input that is burnt machine electromagnetic oven 6 with the electric energy that guarantees feedback; Described DC/AC inverter circuit 5 comprises capacitor C 6, power converter 51 and low-pass filter 52, the output terminal of power converter 51 is connected with the input end of low-pass filter 52, wherein power converter 51 is by power tube Q1, Q2, Q3, Q4 forms, power tube Q1, Q2, Q3, Q4 is subjected to the control end Ua1 of the sinusoidal wave inverter circuit 121 of DSP isolation drive respectively, Ub1, Uc1, Ud1 controls, C6 is a filter capacitor, the positive pole of C6 is connected with the voltage output end of DC voltage combiner circuit 4, the negative pole of C6 is connected with second ground connection, inductance L 3, L4 and capacitor C 7 constitute low-pass filter 52, the output terminal of low-pass filter 52 is connected with the power input that is burnt machine electromagnetic oven 6, for electromagnetic oven provides the burning machine required electric energy; L0 among Fig. 2 is the coil that is burnt machine electromagnetic oven 6 inside.
L5 among Fig. 3 is a field coil 7, when L5 is placed on the ceramic microcrystalline plate that is burnt machine electromagnetic oven 6, is equivalent to L0 and L5 and forms a high-frequency transformer, L0 is equivalent to the elementary of transformer, L5 is equivalent to the secondary of transformer, and when L0 had high-frequency current to pass through, L5 just had HF voltage to produce; Described HF voltage coupling and rectification circuit 8 are made up of capacitor C 8 and bridge rectifier BD2, the end of C8 is connected with the 1st pin of BD2, the other end is connected with the end of field coil L5, the other end of field coil L5 is connected with the 3rd pin of BD2, the 2nd pin of BD2 is the cathode voltage output terminal of HF voltage coupling and rectification circuit 8, the 4th pin of BD2 is the cathode voltage output terminal of HF voltage coupling and rectification circuit 8, C8 is a coupling capacitance, play the effect of impedance matching, to guarantee to be burnt the operate as normal of machine electromagnetic oven 6, because the loaded impedance that this electric energy conversion of electromagnetic oven is presented not is a pure resistor load; Described high frequency PFC change-over circuit 9 comprises PFC control circuit 91, field effect transistor Q5, diode D3, inductance L 6, resistance R 2, R3, R4, capacitor C 9, C10, cathode voltage input end, cathode voltage input end; Wherein, the cathode voltage input end is connected with the cathode voltage output terminal with the cathode voltage output terminal of HF voltage coupling and rectification circuit 8 respectively with the cathode voltage input end; C9 is preceding filter capacitor, and it is connected between the cathode voltage input end and cathode voltage input end of high frequency PFC change-over circuit 9; The end of L6 is connected with the cathode voltage input end, and the other end is connected with the anode of D3, and the negative electrode of D3 is the voltage output end (VBUS2) of high frequency PFC change-over circuit 9; The positive pole of C10 is connected with the negative electrode of D3, and the negative pole of C10 is connected with the 3rd ground connection; The end of R3 is connected with the negative electrode of D3, and the other end is connected with the end of R4, and the other end of R4 is connected with the 3rd ground connection; The 1st pin of field effect transistor Q5 is connected with the anode of D3, and the 2nd pin is connected with the 3rd ground connection, and the 3rd pin is connected with the 2nd pin (GATE) of PFC control circuit 91; The 1st pin (VCC) of PFC control circuit 91 is a power input, VCC is connected with power supply, the 3rd pin (VFB) is connected with contact between R3, the R4, the 4th pin (GND) is connected with the 3rd ground connection, the 5th pin (Isns) is connected with the cathode voltage input end, certainly, described PFC control circuit 91 can be realized by a PFC chip; R2 is connected between the 4th pin and the 5th pin of PFC control circuit 91, the working power VCC of PFC control circuit 91 is provided after isolating conversion by auxiliary power circuit 11, be subjected to the control of DSP control circuit 12 simultaneously, promptly DSP control circuit 12 is controlled high frequency PFC change-over circuit 9 (but not shown in the figures) by Control work power supply VCC; As VBUS2 during greater than VBUS1, the VCC of high frequency PFC change-over circuit 9 could connect, and high frequency PFC change-over circuit 9 is just started working; Described feedback current limit circuit 10 is power tube Q7, and Q7 is subjected to the control of DSP isolation drive current limit circuit 122; Described high-frequency rectification circuit 13 is bridge rectifier BD1, starts fictitious load and control circuit 14 and is made up of resistance R 5 and power tube Q6, and resistance R 5 is for starting fictitious load, and power tube Q6 is subjected to the control of DSP isolation drive start-up circuit 123; As VBUS2 during greater than VBUS1, the VCC of high frequency PFC change-over circuit 9 connects, after high frequency PFC change-over circuit 9 is started working, DSP isolation drive current limit circuit 122 sends merging loaded switches signal controlling Q7 and gradually becomes conducting state from cut-off state, meanwhile, be subjected to the Q6 of DSP isolation drive start-up circuit 123 controls to gradually become cut-off state by conducting state, allow and start fictitious load R5 after finishing the startup electromagnetic oven, remove again and start fictitious load R5, in order to avoid consume extra electric energy, wherein, this merges the dutycycle size and the pace of change of loaded switches signal to DSP isolation drive current limit circuit 122 by control, be the size of current and the speed of may command feedback electric energy, thereby guarantee that being burnt machine electromagnetic oven 6 can stably work in burning the machine process.
Need to prove, before being burnt 6 startups of machine electromagnetic oven, high frequency PFC change-over circuit 9 must quit work earlier, allows the 9 out-of-work actions of high frequency PFC change-over circuit can be the operating voltage that disconnects high frequency PFC change-over circuit 9, apply an inner relevance ratio of the ratio high voltage of Vref (reference voltage) value for VFB (output voltage sampling) pin of PFC control circuit 91, give overvoltage OVP (output over-voltage protection) pin of PFC control circuit 91 apply an inner relevance ratio of ratio reach the high voltage of overvoltage protection operating point or give current detecting Isns (over-current detection) pin of PFC control circuit 91 apply an inner relevance ratio of ratio reach the high absolute value voltage of overcurrent protection operating point; When the output voltage V BUS2 of high frequency PFC change-over circuit 9 is higher than the output voltage V BUS1 of low frequency PFC change-over circuit 3, high frequency PFC change-over circuit 9 is just started working, and the action that allows high frequency PFC change-over circuit 9 start working can be to connect the working power of high frequency PFC change-over circuit 9 or people to apply the function that external voltage forces high frequency PFC change-over circuit 9 to enter guard mode all to remove; After high frequency PFC change-over circuit 9 was started working, feedback current limit circuit 10 was just started working, and the electric current of feedback electric energy is strengthened gradually from minimum; Simultaneously, described startup fictitious load and control circuit 14, in the energy-conservation burning machine of electromagnetic oven start-up course, starting fictitious load R5 elder generation full load connects, when the electric current of feedback electric energy strengthened gradually from minimum, the load that starts fictitious load R5 alleviated gradually, so that unloaded fully, promptly remove and start fictitious load R5, in order to avoid consume extra electric energy.
Certainly, the above only is preferred embodiment of the present utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.
Claims (7)
1, the energy-conservation burn-in device of electromagnetic oven efficiently, it comprises field coil, the high-frequency filter circuit of Lian Jieing successively, the low frequency rectification circuit, low frequency PFC change-over circuit, the DC voltage combiner circuit, the DC/AC inverter circuit, it is characterized in that: it also comprises HF voltage coupling and rectification circuit, high frequency PFC change-over circuit, the DSP control circuit, the input end of described HF voltage coupling and rectification circuit is connected with the output terminal of field coil, the output terminal of HF voltage coupling and rectification circuit is connected with the voltage input end of high frequency PFC change-over circuit, and the output terminal of high frequency PFC change-over circuit is connected with the feedback voltage input end of DC voltage combiner circuit; The control output end of DSP control circuit is connected with the control input end of DC/AC inverter circuit, the control input end of high frequency PFC change-over circuit respectively, is used to control DC/AC inverter circuit and high frequency PFC change-over circuit.
2, the energy-conservation burn-in device of electromagnetic oven efficiently according to claim 1, it is characterized in that: further comprise the feedback current limit circuit, high-frequency rectification circuit, startup fictitious load and the control circuit that are used to control the feedback size of current, the voltage input end of described feedback current limit circuit is connected with the output terminal of high frequency PFC change-over circuit, and the output terminal of feedback current limit circuit is connected with the feedback voltage input end of DC voltage combiner circuit; The input end of described high-frequency rectification circuit is connected with the output terminal of field coil, and the output terminal of high-frequency rectification circuit is connected with the input end that starts fictitious load and control circuit; The control output end of described DSP control circuit is connected with the control input end of feedback current limit circuit, the control input end that starts fictitious load and control circuit respectively, is used to control feedback current limit circuit and startup fictitious load and control circuit.
3, the energy-conservation burn-in device of electromagnetic oven efficiently according to claim 2, it is characterized in that: described DSP control circuit comprises the sinusoidal wave inverter circuit of DSP isolation drive, DSP isolation drive current limit circuit, DSP isolation drive start-up circuit, the sinusoidal wave inverter circuit of DSP isolation drive is connected with the control input end of DC/AC inverter circuit, is used to control the DC/AC inverter circuit; DSP isolation drive current limit circuit is connected with the control input end of feedback current limit circuit, is used to control the feedback current limit circuit; DSP isolation drive start-up circuit is connected with the control input end that starts fictitious load and control circuit, is used for control and starts fictitious load and control circuit.
4, the energy-conservation burn-in device of electromagnetic oven efficiently according to claim 1, it is characterized in that: described HF voltage coupling and rectification circuit are made up of capacitor C 8 and bridge rectifier BD2, the end of C8 is connected with the 1st pin of BD2, the other end is connected with an end of field coil, the other end of field coil is connected with the 3rd pin of BD2, the 2nd pin of BD2 is the cathode voltage output terminal of HF voltage coupling and rectification circuit, and the 4th pin of BD2 is the cathode voltage output terminal of HF voltage coupling and rectification circuit.
5, the energy-conservation burn-in device of electromagnetic oven efficiently according to claim 4, it is characterized in that: described high frequency PFC change-over circuit comprises the PFC control circuit, field effect transistor Q5, diode D3, inductance L 6, resistance R 2, R3, R4, capacitor C 9, C10, cathode voltage input end, cathode voltage input end; Wherein, the cathode voltage input end is connected with the cathode voltage output terminal with the cathode voltage output terminal of HF voltage coupling and rectification circuit respectively with the cathode voltage input end; C9 is preceding filter capacitor, and it is connected between the cathode voltage input end and cathode voltage input end of high frequency PFC change-over circuit; The end of L6 is connected with the cathode voltage input end, and the other end is connected with the anode of D3, and the negative electrode of D3 is the voltage output end of high frequency PFC change-over circuit; The positive pole of C10 is connected with the negative electrode of D3, and the negative pole of C10 is connected with the 3rd ground connection; The end of R3 is connected with the negative electrode of D3, and the other end is connected with the end of R4, and the other end of R4 is connected with the 3rd ground connection; The 1st pin of field effect transistor Q5 is connected with the anode of D3, and the 2nd pin is connected with the 3rd ground connection, and the 3rd pin is connected with the 2nd pin of PFC control circuit; The 1st pin of PFC control circuit is a power input, and the 3rd pin is connected with contact between R3, the R4, and the 4th pin is connected with the 3rd ground connection, and the 5th pin is connected with the cathode voltage input end; R2 is connected between the 4th pin and the 5th pin of PFC control circuit.
6, the energy-conservation burn-in device of electromagnetic oven efficiently according to claim 1, it is characterized in that: the voltage output end of described low frequency PFC change-over circuit is connected with auxiliary power circuit, and this auxiliary power circuit is used to each circuit that working power is provided.
7, the energy-conservation burn-in device of electromagnetic oven efficiently according to claim 1, it is characterized in that: described field coil is made up of disc coil and high frequency magnetic stripe, and the disc coil is to be formed by some bursts of enameled wire coilings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920051270U CN201387455Y (en) | 2009-02-17 | 2009-02-17 | High-efficiency electro-magnetic cooker energy-saving burning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920051270U CN201387455Y (en) | 2009-02-17 | 2009-02-17 | High-efficiency electro-magnetic cooker energy-saving burning device |
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| CN201387455Y true CN201387455Y (en) | 2010-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751791A (en) * | 2011-04-18 | 2012-10-24 | 深圳市金威源科技股份有限公司 | Method and device for induction cooker aging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751791A (en) * | 2011-04-18 | 2012-10-24 | 深圳市金威源科技股份有限公司 | Method and device for induction cooker aging |
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