CN101945510B - Progressive frequency constant power control circuit of induction cooker - Google Patents
Progressive frequency constant power control circuit of induction cooker Download PDFInfo
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- CN101945510B CN101945510B CN 201010249103 CN201010249103A CN101945510B CN 101945510 B CN101945510 B CN 101945510B CN 201010249103 CN201010249103 CN 201010249103 CN 201010249103 A CN201010249103 A CN 201010249103A CN 101945510 B CN101945510 B CN 101945510B
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- 230000006698 induction Effects 0.000 title abstract description 3
- 230000000750 progressive effect Effects 0.000 title 1
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The invention relates to a frequency-by-frequency constant power control circuit of an induction cooker, which comprises an LC resonance circuit, a high-frequency current sampling circuit, a full-wave rectifying circuit and a logic driving circuit, wherein the output end of the LC resonance circuit is connected with the input end of the high-frequency current sampling circuit, the output end of the high-frequency current sampling circuit is connected with the input end of the full-wave rectifying circuit, and the output end of the logic driving circuit is connected with the input end of the LC resonance circuit. The invention has the advantages that the frequency-by-frequency feedback control circuit is added in the subsequent circuit of the rectification circuit, the PWM integral voltage can be adjusted in real time according to the actual change of the voltage of the power grid, and the high-frequency current is automatically controlled in a closed loop manner, so that the aim of keeping constant power is fulfilled, the overcurrent of power devices such as a rectifier bridge, an IGBT (insulated gate bipolar transistor) or an MOS (metal oxide semiconductor) transistor is effectively prevented, and the safety and the reliability of key components are improved.
Description
Technical field
The present invention relates to a kind of frequently constant power control circuit that pursues of electromagnetic oven, belong to real-time guard and the control technology field of electromagnetic oven circuit.
Background technology
Electromagnetic oven is along with the rising of line voltage, power and voltage are quadratic relationship sharply to be increased: when voltage raises 20% the time, power can increase approximately about 44%, if do not carry out constant to power, can cause the overcurrent of rectifier bridge and IGBT, very large on the unfailing performance impact of product.The permanent merit scheme of existing realization generally is by scm software detection of grid voltage, low-frequency current, again by PWM (pulse width modulation) integral voltage regulating power, exist sample rate slow, actual change that can not the real-time tracking high-frequency current, the problems such as obvious hysteresis are arranged between the variation of permanent merit adjusting and line voltage, can't reach by the frequently requirement of permanent merit.
Summary of the invention
The object of the invention is to consider the problems referred to above and a kind of actual change according to line voltage is provided, can realize the dynamically constant in real time of power, effectively prevent rectifier bridge, IGBT or metal-oxide-semiconductor constant power device overcurrent, improve the fail safe of key components and reliability electromagnetic oven by constant power control circuit frequently.
Technical scheme of the present invention is: a kind of electromagnetic oven by constant power control circuit frequently, comprise the LC resonant circuit, the high-frequency current sample circuit, full-wave rectifying circuit and logic drive circuit, wherein said LC resonant circuit output links to each other with the input of high-frequency current sample circuit, the output of high-frequency current sample circuit links to each other with the input of full-wave rectifying circuit, the output of logic drive circuit links to each other with the input of LC resonant circuit, characterized by further comprising by the frequency feedback control circuit, input by the frequency feedback control circuit links to each other with the output of full-wave rectifying circuit, and its output links to each other with the input of logic drive circuit.
The described frequency feedback control circuit that pursues comprises comparator IC4A, adjustable resistance VER41, resistance R 41, resistance R 42, resistance R 43, capacitor C 41, triode Q41, voltage stabilizing didoe ZD41, diode D41, the negative input end of comparator IC4A connects the output of full-wave rectifying circuit, the positive input terminal of comparator IC4A connects the centre cap of adjustable resistance VER41, the output of comparator IC4A is connected with the B utmost point of resistance R 42, capacitor C 41, triode Q41 respectively, adjustable resistance VER41 one end connects power supply U2, other end contact resistance R41; The anode of resistance R 41, capacitor C 41, voltage stabilizing didoe ZD41 and the E utmost point of triode Q41 connect public connecting end VSS, the negative electrode of the C utmost point of triode Q41 and resistance R 43, voltage stabilizing didoe ZD41, the anodic bonding of diode D41, the negative electrode of diode D41 is connected with the PWM integral voltage end of logic drive circuit, another termination power U1 of resistance R 42, resistance R 43.
Described full-wave rectifying circuit is the all-wave precise rectification circuit, and its internal amplifier IC3A and IC3B are high speed amplifier.
The operation principle of circuit of the present invention is: can produce high-frequency current during the work of LC resonant circuit, behind high-frequency current sample circuit and full-wave rectifying circuit, form doubly the frequency domain dc pulse signal of LC resonance frequency, the dc pulse signal signal compares with the baseline signal value of pursuing in the frequency feedback control circuit: when voltage rises, power raises, high-frequency current rises thereupon, when closing on or surpass the signal criterion value, comparative result is fed back to the integral voltage of PWM by the frequency feedback circuit, change power by the integral voltage that changes PWM thereupon; After power reduced, high-frequency current reduced thereupon, and feedback signal finishes, and it is normal that the PWM integral voltage recovers.So repeatedly realize the dynamically constant in real time of power.
The invention has the beneficial effects as follows, in the subsequent conditioning circuit of rectification circuit, increased by the frequency feedback control circuit, can be according to the actual change of line voltage, adjust in real time the PWM integral voltage, automated closed-loop control high-frequency current, thereby reach the purpose of firm power, effectively prevent rectifier bridge, IGBT or metal-oxide-semiconductor constant power device overcurrent, improve fail safe and the reliability of key components.
Description of drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit diagram of the present invention.
Embodiment
The present invention is further described below in conjunction with embodiment and accompanying drawing.
As shown in Figure 1, electromagnetic oven of the present invention by constant power control circuit frequently, comprise LC resonant circuit 1, high-frequency current sample circuit 2, full-wave rectifying circuit 3, by frequency feedback control circuit 4 and logic drive circuit 5, wherein LC resonant circuit 1 output links to each other with the input of high-frequency current sample circuit 2, the output of high-frequency current sample circuit 2 links to each other with the input of full-wave rectifying circuit 3, the input of feedback control circuit 4 links to each other the output of full-wave rectifying circuit 3 with pursuing frequently, output by frequency feedback control circuit 4 links to each other with the input of logic drive circuit 5, and the output of logic drive circuit 5 links to each other with the input of LC resonant circuit 1.
In the present embodiment, described LC resonant circuit 1 comprises IGBT11, IGBT12, IGBT13, IGBT14, coil panel inductance L 11, resonant capacitance C11, the emitter of IGBR11 connects respectively IGBT12 collector electrode, coil panel inductance L 11 1 ends, coil panel inductance L 11 other ends connect resonant capacitance C11 one end, and the other end of resonant capacitance C11 connects respectively IGBT13 collector electrode and IGBT14 emitter; The IGBT11 collector electrode links to each other with power supply PVCC with the IGBT14 collector electrode, the IGBT12 emitter links to each other with public connecting end PGND with the IGBT13 emitter, and the grid of IGBT11, IGBT12, IGBT13, IGBT14 is connected respectively IGBT11-GE, IGBT12-GE, IGBT13-GE, the IGBT14-GE end in the logic drive circuit 5.
Described high frequency sampling circuit 2 comprises Current Transmit 21 and resistance R 21, and Current Transmit 21 1 ends are connected with resistance R 31 1 ends in resistance R 21 and the full-wave rectifying circuit 3, and the other end of Current Transmit 21, resistance R 21 connects public connecting end VSS.
Described full-wave rectifying circuit 3 comprises resistance R 31, resistance R 32, resistance R 33, resistance R 34, resistance R 35, capacitor C 31, diode D31, diode D32, amplifier IC3A, amplifier IC3B, capacitor C 31 1 ends are connected with resistance R 21 1 ends in resistance R 31, resistance R 32 and the high frequency sampling circuit 2, and the other end connects public connecting end VSS; The other end of resistance R 31 is connected with the negative input end of amplifier IC3A, the negative electrode of diode D31, an end of resistance R 33 respectively, the output of the anodic bonding amplifier IC3A of diode D31 and the negative electrode of diode D32, resistance R 33 other ends connect the anode of diode D32, an end of resistance R 34; The other end of the negative input end contact resistance R32 of amplifier IC3B, resistance R 34, resistance R 35, an end of resistance R 35 connects the output of comparator IC3B; The positive input terminal of amplifier IC3A, amplifier IC3B connects public connecting end VSS.
The described frequency feedback control circuit 4 that pursues comprises comparator IC4A, adjustable resistance VER41, resistance R 41, resistance R 42, resistance R 43, capacitor C 41, triode Q41, voltage stabilizing didoe ZD41, diode D41, the negative input end of comparator IC4A connects amplifier IC3B output and the resistance 35 in the full-wave rectifying circuit 3, the positive input terminal of comparator IC4A connects the centre cap of adjustable resistance VER41, the output of comparator IC4A respectively with resistance R 42, capacitor C 41, the B utmost point of triode Q41 connects, adjustable resistance VER41 one end connects power supply U2, other end contact resistance R41; The anode of resistance R 41, capacitor C 41, voltage stabilizing didoe ZD41 and the E utmost point of triode Q41 connect public connecting end VSS, the negative electrode of the C utmost point of triode Q41 and resistance R 43, voltage stabilizing didoe ZD41, the anodic bonding of diode D41, the negative electrode of diode D41 is connected with the PWM integral voltage end of logic drive circuit 5, another termination power U1 of resistance R 42, resistance R 43.
Described logic drive circuit 5 comprises single-chip microprocessor MCU, resistance R 51, resistance R 52, resistance R 53, resistance R 54, capacitor C 51, amplifier IC5A, amplifier IC5B, logic chip UCC3895, drives chip UA, UB, UC, UD, resistance R 51 1 ends connect the PWM end of MCU, the other end connects respectively capacitor C 51 1 ends and amplifier IC5A positive input terminal, and capacitor C 51 other ends connect public connecting end VSS; The negative input end of amplifier IC5A is connected with the IC5A output, and resistance R 52 is series between amplifier IC5B negative input end and the IC5A output; Resistance R 54 is parallel between amplifier IC5B negative input end and the IC5B output; Resistance R 53 1 ends connect amplifier IC5B positive input terminal, another termination 5V power supply; Resistance R 55 1 ends connect amplifier IC5B positive input terminal, another termination common port VSS; Amplifier IC5B output connects 20 pin of logic chip UCC3895, and 1 pin of logic chip UCC3895 links to each other with 2 pin.The OUTA of logic chip UCC3895, OUTB, OUTC, OUTD end are connected respectively OUTA, OUTB, OUTC, the OUTD end that drives among chip UA, UB, UC, the UD; IGBT11-GE, the IGBT12-GE, IGBT13-GE, the IGBT14-GE end that drive chip UA, UB, UC, UD are connected respectively IGBT11, the IGBT12 in the LC resonant capacitance 1, the grid of IGBT13, IGBT14.
In the present embodiment, during for the assurance voltage ripple of power network, power limited sensitivity, accuracy, all-wave precise rectification circuit 3 internal amplifier IC3A and IC3B all select high speed amplifier TL082 in the present embodiment.Logic drive circuit 5 is based on the Phase control IC UCC3895 of Unichode company and the driving chip TX-K841 of Beijing Luo Muyuan company is the circuit of core technology, single-chip microprocessor MCU adopts the single-chip microcomputer uPD78F9234 of NEC Corporation, the related peripheral circuit can with reference to the supporting technical specification of producer, not repeat them here.
The principle of circuit of the present invention is:
The PWM of LC resonant circuit receive logic drive circuit output drives signal, produce high-frequency current, change high-frequency voltage signal Ux into through isolation, decay sampling, high-frequency voltage signal Ux is converted to dc pulse signal Uy through the full-wave rectifying circuit amplification, and the signal criterion value Uset that dc pulse signal Uy and adjustable resistance VER41 set compares:
When line voltage be 245～265V (± 3V) time, Uy＞Uset, the output of comparator IC4A becomes low level by high level, capacitor C 41 repid discharges are to the 0V, triode Q41 forces to enter cut-off region by the saturation region, U1 makes voltage stabilizing didoe ZD41 reverse breakdown by resistance R 43, diode D41 forward conduction, PWM integral voltage=ZD41
Reverse breakdown voltage-D41
Forward conduction voltage drop, thereby rise to maximum, thus high-frequency current and power reduced.
When line voltage be 228～244V (± 3V) time, Uy ≈ Uset, the output of comparator IC4A becomes low level by high level, capacitor C 41 is discharged at a slow speed about 0.6～0.7V, triode Q41 enters the amplification region by the saturation region, between C, the E utmost point, form artifical resistance Rce, voltage stabilizing didoe ZD41 virtual voltage equals voltage between C, the E utmost point, but be lower than the reverse breakdown voltage of voltage stabilizing didoe ZD41, diode D41 forward conduction, this moment PWM integral voltage=(U1*Rce)/(Rce+R43)-D41
Forward conduction voltage drop, so the lifting amplitude is little, has moderately reduced high-frequency current and power.
When line voltage be lower than 228V (± 3V) time, Uy＜Uset, the output of IC4A becomes high level by low level, and U1 charges to C41 by R42, and triode Q41 enters the saturation region by cut-off region, voltage stabilizing didoe ZD41 both end voltage equals voltage between triode Q41C, the E utmost point, near 0V, diode D41 oppositely ends, and this moment, the PWM integral voltage no longer was subjected to control by the permanent merit circuit of frequency, but determined by the pwm signal that MCU sends, high-frequency current and power change with the PWM integral voltage.
Capacitor C 41 and voltage stabilizing didoe ZD41 select suitable parameter, can realize highly stable permanent effect fruit.
Claims (2)
1. an electromagnetic oven by constant power control circuit frequently, comprise LC resonant circuit (1), high-frequency current sample circuit (2), full-wave rectifying circuit (3), by frequency feedback control circuit (4) and logic drive circuit (5), wherein said LC resonant circuit (1) output links to each other with the input of high-frequency current sample circuit (2), the output of high-frequency current sample circuit (2) links to each other with the input of full-wave rectifying circuit (3), the output of logic drive circuit (5) links to each other with the input of LC resonant circuit (1), input by frequency feedback control circuit (4) links to each other with the output of full-wave rectifying circuit (3), and its output links to each other with the input of logic drive circuit (5);
Described LC resonant circuit (1) comprises IGBT11, IGBT12, IGBT13, IGBT14, coil panel inductance L 11, resonant capacitance C11, the emitter of IGBR11 connects respectively IGBT12 collector electrode, coil panel inductance L 11 1 ends, coil panel inductance L 11 other ends connect resonant capacitance C11 one end, and the other end of resonant capacitance C11 connects respectively IGBT13 collector electrode and IGBT14 emitter; The IGBT11 collector electrode links to each other with power supply PVCC with the IGBT14 collector electrode, the IGBT12 emitter links to each other with public connecting end PGND with the IGBT13 emitter, and the grid of IGBT11, IGBT12, IGBT13, IGBT14 is connected respectively IGBT11-GE, IGBT12-GE, IGBT13-GE, the IGBT14-GE end in the logic drive circuit (5);
Described high frequency sampling circuit (2) comprises Current Transmit 21 and resistance R 21, Current Transmit 21 1 ends are connected with resistance R 31 1 ends in resistance R 21 and the full-wave rectifying circuit (3), and the other end of Current Transmit 21, resistance R 21 connects public connecting end VSS;
Described full-wave rectifying circuit (3) comprises resistance R 31, resistance R 32, resistance R 33, resistance R 34, resistance R 35, capacitor C 31, diode D31, diode D32, amplifier IC3A, amplifier IC3B, capacitor C 31 1 ends are connected with resistance R 21 1 ends in resistance R 31, resistance R 32 and the high frequency sampling circuit 2, and the other end connects public connecting end VSS; The other end of resistance R 31 is connected with the negative input end of amplifier IC3A, the negative electrode of diode D31, an end of resistance R 33 respectively, the output of the anodic bonding amplifier IC3A of diode D31 and the negative electrode of diode D32, resistance R 33 other ends connect the anode of diode D32, an end of resistance R 34; The other end of the negative input end contact resistance R32 of amplifier IC3B, resistance R 34, resistance R 35, an end of resistance R 35 connects the output of comparator IC3B; The positive input terminal of amplifier IC3A, amplifier IC3B connects public connecting end VSS;
The described frequency feedback control circuit (4) that pursues comprises comparator IC4A, adjustable resistance VER41, resistance R 41, resistance R 42, resistance R 43, capacitor C 41, triode Q41, voltage stabilizing didoe ZD41, diode D41, the negative input end of comparator IC4A connects amplifier IC3B output and the resistance 35 in the full-wave rectifying circuit (3), the positive input terminal of comparator IC4A connects the centre cap of adjustable resistance VER41, the output of comparator IC4A respectively with resistance R 42, capacitor C 41, the B utmost point of triode Q41 connects, adjustable resistance VER41 one end connects power supply U2, other end contact resistance R41; The anode of resistance R 41, capacitor C 41, voltage stabilizing didoe ZD41 and the E utmost point of triode Q41 connect public connecting end VSS, the negative electrode of the C utmost point of triode Q41 and resistance R 43, voltage stabilizing didoe ZD41, the anodic bonding of diode D41, the negative electrode of diode D41 is connected with the PWM integral voltage end of logic drive circuit (5), another termination power U1 of resistance R 42, resistance R 43;
Described logic drive circuit (5) comprises single-chip microprocessor MCU, resistance R 51, resistance R 52, resistance R 53, resistance R 54, capacitor C 51, amplifier IC5A, amplifier IC5B, logic chip UCC3895, drives chip UA, UB, UC, UD, resistance R 51 1 ends connect the PWM end of MCU, the other end connects respectively capacitor C 51 1 ends and amplifier IC5A positive input terminal, and capacitor C 51 other ends connect public connecting end VSS; The negative input end of amplifier IC5A is connected with the IC5A output, and resistance R 52 is series between amplifier IC5B negative input end and the IC5A output; Resistance R 54 is parallel between amplifier IC5B negative input end and the IC5B output; Resistance R 53 1 ends connect amplifier IC5B positive input terminal, another termination 5V power supply; Resistance R 55 1 ends connect amplifier IC5B positive input terminal, another termination common port VSS; Amplifier IC5B output connects 20 pin of logic chip UCC3895, and 1 pin of logic chip UCC3895 links to each other with 2 pin; The OUTA of logic chip UCC3895, OUTB, OUTC, OUTD end are connected respectively OUTA, OUTB, OUTC, the OUTD end that drives among chip UA, UB, UC, the UD; IGBT11-GE, the IGBT12-GE, IGBT13-GE, the IGBT14-GE end that drive chip UA, UB, UC, UD are connected respectively IGBT11, the IGBT12 in the LC resonant capacitance 1, the grid of IGBT13, IGBT14.
Electromagnetic oven according to claim 1 by constant power control circuit frequently, it is characterized in that described amplifier IC3A and IC3B are high speed amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010249103 CN101945510B (en) | 2010-08-02 | 2010-08-02 | Progressive frequency constant power control circuit of induction cooker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010249103 CN101945510B (en) | 2010-08-02 | 2010-08-02 | Progressive frequency constant power control circuit of induction cooker |
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| CN101945510A CN101945510A (en) | 2011-01-12 |
| CN101945510B true CN101945510B (en) | 2013-01-09 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102711298B (en) * | 2012-05-23 | 2014-01-01 | 美的集团股份有限公司 | Heating control device of induction cooker and control method |
| CN107295707B (en) * | 2016-04-11 | 2023-10-24 | 佛山市顺德区美的电热电器制造有限公司 | Driving circuit, electromagnetic heating device and driving method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764652A (en) * | 1986-04-23 | 1988-08-16 | Gold Star Co., Ltd. | Power control device for high-frequency induced heating cooker |
| CN201000124Y (en) * | 2007-01-17 | 2008-01-02 | 陈华新 | Electromagnetic furnace function controlling device |
| CN201310962Y (en) * | 2008-10-13 | 2009-09-16 | 周卫国 | IGBT (Insulated Gate Bipolar Transistor) protection device of induction cooker |
| CN201355875Y (en) * | 2008-12-12 | 2009-12-02 | 深圳市鑫汇科科技有限公司 | Electromagnetic oven circuit based on SoC chip |
| CN201750580U (en) * | 2010-08-02 | 2011-02-16 | 美的集团有限公司 | Progressive frequency constant power control circuit of induction cooker |
-
2010
- 2010-08-02 CN CN 201010249103 patent/CN101945510B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764652A (en) * | 1986-04-23 | 1988-08-16 | Gold Star Co., Ltd. | Power control device for high-frequency induced heating cooker |
| CN201000124Y (en) * | 2007-01-17 | 2008-01-02 | 陈华新 | Electromagnetic furnace function controlling device |
| CN201310962Y (en) * | 2008-10-13 | 2009-09-16 | 周卫国 | IGBT (Insulated Gate Bipolar Transistor) protection device of induction cooker |
| CN201355875Y (en) * | 2008-12-12 | 2009-12-02 | 深圳市鑫汇科科技有限公司 | Electromagnetic oven circuit based on SoC chip |
| CN201750580U (en) * | 2010-08-02 | 2011-02-16 | 美的集团有限公司 | Progressive frequency constant power control circuit of induction cooker |
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