CN105517217B - A kind of microcontroller control high-frequency induction heating power - Google Patents
A kind of microcontroller control high-frequency induction heating power Download PDFInfo
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- CN105517217B CN105517217B CN201610061061.8A CN201610061061A CN105517217B CN 105517217 B CN105517217 B CN 105517217B CN 201610061061 A CN201610061061 A CN 201610061061A CN 105517217 B CN105517217 B CN 105517217B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/08—Control, e.g. of temperature, of power using compensating or balancing arrangements
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- General Induction Heating (AREA)
Abstract
A kind of microcontroller control high-frequency induction heating power, including electromagnetic interference filter circuit, industrial frequency rectifying circuit, power frequency filter circuit, chopper circuit, copped wave filter circuit, inverter circuit, resonance circuit, phase monitor circuit, loop filter circuit, Power arithmetic circuit, phase shortage checks circuit, Type of Switch Stabilivolt Source Circuit and single chip control unit.The power supply realizes power regulation using microcontroller control, circuit is simple, it is maintainable good, and the power regulation linearity is good and accuracy is high, and reverse frequency can be made to always work near the intrinsic frequency of resonance circuit, the zero voltage switch that inverter switching device pipe can be achieved, reduces the loss of inverter switching device pipe, improves inversion efficiency.
Description
Technical field
The invention mainly relates to high-frequency induction heating power technical fields, refer in particular to a kind of microcontroller control high-frequency induction
Heating power supply.
Background technology
In paper substrate liquid germ-free loading production process, needs to carry out sealing processing to packaging material, form it into fixed shape
The closed container of shape, to facilitate the storage and transport of liquid, the mouth-sealing method used at present is to pass through high-frequency induction heating power
Paperbased packaging material sealing part is heated, heat is conducted to paperbased packaging material sealing part by high-frequency induction heating power
PE film layers allow it to melt, while applying pressure in sealing part so that PE film layers mutually merge, and form sealing.Utilize electromagnetism
When high-frequency induction heating power seals paperbased packaging material, by selecting suitable output high frequency power, high frequency lasting
Time (i.e. heating time) and sealing pressure and other parameters, can obtain good sealing seal and production efficiency.High-frequency induction
Heating power supply provides for paperbased packaging material sealing processing quickly with accurately heating power supply, and performance is fine or not, directly affects paper
The quality and production efficiency of base packing material sealing.
High-frequency induction heating power generally use metal oxide film insulated gate electrode currently used for paperbased packaging material sealing
The devices such as transistor (MOSFET) and capacitance and inductance form resonant mode inverter main circuit, are main device by integrated operational amplifier
Part forms analog controller, and the adjusting and control of reverse frequency and output power are carried out to resonant mode inverter main circuit, main
The problem is that consistency and stability are poor, it is more by the precision of other components of circuit, the temperature of working environment etc.
The influence of kind factor, easy tos produce operating point drift, it is therefore desirable to take a large amount of compensation circuit to inhibit to drift about, to increase
Circuit complexity, it is maintainable poor.And current high-frequency induction heating power is operated in frequency conversion single stage power regulative mode, when
When need to change the output power of inverter main circuit, be directly by change reverse frequency off-resonance circuit solid frequency it is remote,
Recently change inverter main circuit output voltage and electric current amplitude and phase difference it is large and small, to change inverter main circuit
Output power, and changing reverse frequency can cause to change while two output quantities of amplitude and phase difference of voltage and electric current,
Therefore, the working method power regulation curve linear is poor (being in nonlinear state), the intrinsic frequency of reverse frequency off-resonance circuit
The problems such as rate works, and inverter switching device pipe can not achieve zero voltage switch, therefore power consumption is caused to increase, and inversion efficiency reduces.
Invention content
The invention mainly relates to a kind of microcontrollers to control high-frequency induction heating power, which is realized using microcontroller control
Power regulation, circuit is simple, maintainable good, and the power regulation linearity is good and accuracy is high, and can make reverse frequency always
The intrinsic frequency of resonance circuit is operated in nearby, it can be achieved that the zero voltage switch of inverter switching device pipe, reduces inverter switching device
The loss of pipe, improves inversion efficiency.
The technical solution adopted in the present invention is：
A kind of microcontroller control high-frequency induction heating power, including sequentially connected electromagnetic interference filter circuit, power frequency are whole
Current circuit, power frequency filter circuit, chopper circuit, copped wave filter circuit, inverter circuit, resonance circuit and heating load circuit,
The input terminal of the electromagnetic interference filter circuit accesses power grid three phase mains, further includes phase monitor circuit, loop filter circuit, work(
Rate computing circuit and single chip control unit, the single chip control unit include that voltage and current sampling ADC, comparator, power are adopted
Sample ADC, power compensator, voltage compensator, voltage adjustment DPWM, phase sample ADC, phase compensator, phase adjustment DPWM,
Wherein, the first current sampling device, first voltage sampling apparatus, first electric current are equipped in the output end of the copped wave filter circuit
Sampling apparatus, first voltage sampling apparatus are connect with the input terminal of the voltage and current sampling ADC, the voltage and current sampling ADC,
Comparator, voltage adjustment DPWM, chopper circuit are sequentially connected, the voltage and current sampling ADC, voltage compensator, voltage adjustment
DPWM, chopper circuit are sequentially connected, and the second current sampling device, second voltage sampling cartridge are equipped in the output end of resonance circuit
It sets, second current sampling device, second voltage sampling apparatus are connect with the input terminal of the Power arithmetic circuit, power fortune
Circuit, power samples ADC, power compensator, voltage compensator is calculated to be sequentially connected；And second current sampling device, the second electricity
Pressure sampling apparatus is connect with the input terminal of the phase monitor circuit, phase monitor circuit, loop filter circuit, the phase sample
ADC, phase compensator, phase adjustment DPWM, inverter circuit are sequentially connected.
Monolithic processor controlled high-frequency induction heating power provided by the invention, by the second current sampling device, second voltage
Sampling apparatus carries out signal sampling to the output voltage and output current of resonance circuit, and the signal after sampling is through phase monitor circuit
Phase signal is calculated, by loop filter circuit smoothing processing, digital quantity is quantified as via phase sample ADC, through phase
Compensator carries out digital operation, calculates the inversion needed for the phase difference for the output voltage and output current that reduce resonance circuit
The operating frequency value in a circuit lower period, is as a result exported by phase adjustment DPWM, and inverter circuit is driven to work, and forms resonance electricity
Road Phase Tracking closed-loop control realizes Phase Tracking control function, to make high-frequency induction heating power all-the-time stable in resonance
Near the intrinsic frequency of circuit, the stability of work is substantially increased；In addition, being adopted by the second current sampling device, second voltage
The output voltage of the collected resonance circuit of sampling device, output current are believed by being converted into corresponding power after Power arithmetic circuit
Number, which carries out digital quantization, fortune of the quantized result digital power value as power compensator via power samples ADC
Foundation is calculated, power adjustment is calculated, voltage compensator is sent into and carries out operation, and the first current sampling device, first voltage are adopted
Sampling device carries out signal sampling to the output voltage and output current of chopper circuit, and the signal after sampling is sampled by voltage and current
ADC carries out digital quantization, and carries out over-voltage over-current protection through comparator, voltage adjustment DPWM, and through voltage and current sampling ADC number
The chopper circuit output voltage signal digital quantization value of word is sent into voltage compensator and carries out operation, and voltage compensator is according to power
Adjusted value and chopper circuit output voltage signal digital quantization value calculate the conduction ratio of next period chopper circuit switching tube, i.e.,
Pulse width is exported by voltage adjustment DPWM, and chopper circuit is driven to work, by adjusting voltage to realize to power regulation,
The digital newspaper industry for realizing output power, to obtain the good power regulation linearity and accuracy.The present invention uses
Determine the two stage power adjustment mode of frequency tune voltage, it is to make inverter circuit always work in resonance circuit intrinsic frequency attached
Closely, the loss for reducing inverter switching device pipe, improves inversion efficiency.
Copped wave filter circuit includes the first inductance L1 and the first capacitance C1 being serially connected, wherein inverter circuit and copped wave
The tie point of filter circuit is arranged at the both ends of the first capacitance C1；Resonance circuit includes the second inductance L2, the second capacitance C2, third
Capacitance C3 and isolating transformer T, wherein second inductance L2, the second capacitance C2, third capacitance C3 are in series, the isolation transformation
One end of device T is in parallel with the third capacitance C3, and the other end of isolating transformer T is connect with heating load circuit.
First voltage sampling apparatus includes first resistor R1 and second resistance R2, one end of first resistor R1 and second resistance
One end of R2 connects, and the other end of first resistor R1, the other end of second resistance R2 are connected with the both ends of the first capacitance C1 respectively
It connects, the voltage sampling port of the voltage and current sampling ADC is arranged between first resistor R1 and second resistance R2, the first current sample
Device is the current transformer CT1 being located between the first capacitance C1 and second resistance R2.
Second current sampling device is the current transformer CT2 being located between inverter circuit and third capacitance C3, the second electricity
It includes the 3rd resistor R3 and winding being in parallel to press sampling apparatus, which connect with isolating transformer T, 3rd resistor R3's
One end is grounded, and the other end of 3rd resistor R3 is the output end of second voltage sampling apparatus.
It is equipped with phase shortage between the output end and single chip control unit of electromagnetic interference filter circuit and checks circuit.The phase shortage
Circuit detection is checked by electromagnetic interference filter circuit treated power grid three phase mains, the control of testing result feed-in microcontroller is single
Member, when any phase voltage phase shortage in three-phase input, it is single that phase shortage checks that circuit output phase shortage alarm signal is controlled to microcontroller
Member, single chip control unit correspondence makes corresponding processing, to ensure circuit safety.
It is circumscribed with+24V power supplys in single chip control unit, is somebody's turn to do+24V power supplys and passes through Type of Switch Stabilivolt Source Circuit and monolithic
Machine control unit connects.Type of Switch Stabilivolt Source Circuit is depressured externally input+24V power supplys, voltage stabilizing, is filtered, from
And provide stable supply voltage for single chip control unit and other functional circuits.
Communication interface is equipped in single chip control unit.Single chip control unit passes through communication interface and other controllers
It is contacted, more controls and monitoring function is realized, such as the setting of running parameter, reading of working condition etc..
It is had the beneficial effect that caused by the present invention：
1, the present invention realizes the phase number Closed loop track control of resonance circuit by single chip control unit, to make
Induction heating power output frequency all-the-time stable substantially increases the stability of work near the intrinsic frequency of resonance circuit；
2, the present invention realizes the digital newspaper industry of output power by single chip control unit, good to obtain
The power regulation linearity and accuracy；
3, the present invention is using the two stage power adjustment mode for determining frequency tune voltage, to make reverse frequency all-the-time stable humorous
Near the intrinsic frequency of circuit of shaking, reduce the loss of inverter switching device pipe, improves the efficiency of high-frequency induction voltage, improve
The power factor of heating load circuit；
4, the configuration of the present invention is simple, control is effective, can be good at the impedance for adapting to different heating load circuit automatically and
The variation of intrinsic frequency improves the seal quality and production efficiency of paperbased packaging material.
Description of the drawings
Fig. 1 is the system principle diagram of the embodiment of the present invention；
Attachment marks：
1, electromagnetic interference filter circuit；2, industrial frequency rectifying circuit；3, power frequency filter circuit；4, chopper circuit；5, inversion electricity
Road；6, heating load circuit；7, phase shortage checks circuit；8, voltage adjusts DPWM；9, comparator；10, voltage and current sampling ADC,
11, phase adjustment DPWM；12, phase compensator；13, phase sample ADC；14, loop filter circuit；15, phase monitor circuit；
16, Power arithmetic circuit；17, power samples ADC；18, power compensator；19, voltage compensator；20, communication interface；21, it opens
Close voltage-stabilized power supply circuit；22, single chip control unit.
Specific implementation mode
A kind of microcontroller control high-frequency induction heating power, including sequentially connected electromagnetic interference filter circuit 1, power frequency are whole
Current circuit 2, power frequency filter circuit 3, chopper circuit 4, copped wave filter circuit, inverter circuit 5, resonance circuit and heating load electricity
The input terminal on road 6, the electromagnetic interference filter circuit 1 accesses power grid three phase mains ABC, further includes phase monitor circuit 15, loop
Filter circuit 14, Power arithmetic circuit 16 and single chip control unit 22, the single chip control unit 22 are adopted including voltage and current
Sample ADC10, comparator 9, power samples ADC17, power compensator 18, voltage compensator 19, voltage adjustment DPWM8, phase are adopted
Sample ADC13, phase compensator 12, phase adjustment DPWM11, wherein be equipped with the first electric current in the output end of the copped wave filter circuit
Sampling apparatus, first voltage sampling apparatus, first current sampling device, first voltage sampling apparatus are adopted with the voltage and current
The input terminal of sample ADC10 connects, and the voltage and current sampling ADC 10, comparator 9, voltage adjustment DPWM8, chopper circuit 4 connect successively
It connects, the voltage and current sampling ADC 10, voltage compensator 19, voltage adjustment DPWM8, chopper circuit 4 are sequentially connected, in resonance electricity
The output end on road is equipped with the second current sampling device, second voltage sampling apparatus, and second current sampling device, second voltage are adopted
Sampling device is connect with the input terminal of the Power arithmetic circuit 16, and the Power arithmetic circuit 16, power samples ADC17, power are mended
Repay device 18, voltage compensator 19 is sequentially connected；And second current sampling device, second voltage sampling apparatus are supervised with the phase
The input terminal of slowdown monitoring circuit 15 connects, the phase monitor circuit 15, loop filter circuit 14, phase sample ADC13, phase compensator
12, phase adjustment DPWM11, inverter circuit 5 are sequentially connected.
Electromagnetic interference filter circuit 1 is isolated by various electromagnetic interference signals with power grid three phase mains ABC.By isolation processing
Power grid three phase mains A ' B ' C ' be converted to smooth high-voltage dc voltage through industrial frequency rectifying circuit 2 and power frequency filter circuit 3, supply
To subsequent conditioning circuits such as chopper circuit 4 and inverter circuits 5.
Monolithic processor controlled high-frequency induction heating power provided by the invention, by the second current sampling device, second voltage
Output voltage u of the sampling apparatus to resonance circuitOWith output current iOSignal sampling is carried out, the signal after sampling is through phase monitor
Circuit 15 calculates phase signal, and by 14 smoothing processing of loop filter circuit, number is quantified as via phase sample ADC13
Amount carries out digital operation through phase compensator 12, calculates the phase of the output voltage and output current to reduce resonance circuit
The operating frequency value in a poor required 5 lower period of inverter circuit, is as a result exported by phase adjustment DPWM11, and drive inverter circuit
5 work, form resonance circuit Phase Tracking closed-loop control, Phase Tracking control function are realized, to make high-frequency induction heat electric
Source all-the-time stable substantially increases the stability of work near the intrinsic frequency of resonance circuit；In addition, by the second current sample
The output voltage u of device, the collected resonance circuit of second voltage sampling apparatusP, output current iPPass through Power arithmetic circuit 16
After be converted into corresponding power signal, which carries out digital quantization, quantized result number work(via power samples ADC17
Operation foundation of the rate value as power compensator 18, calculates power adjustment, is sent into voltage compensator 19 and carries out operation, and the
One current sampling device, first voltage sampling apparatus carry out signal sampling to the output voltage and output current of chopper circuit 4, adopt
Signal after sample carries out digital quantization by voltage and current sampling ADC 10, and is pressed through through comparator 9, voltage adjustment DPWM8
Stream protection, and be sent into voltage through 10 digitized chopper circuit of voltage and current sampling ADC, 4 output voltage signal digital quantization value and mend
It repays device 19 and carries out operation, voltage compensator 19 is according to 4 output voltage signal digital quantization value meter of power adjustment and chopper circuit
The conduction ratio of next 4 switching tube of period chopper circuit, i.e. pulse width are calculated, is exported by voltage adjustment DPWM8, and drive
Chopper circuit 4 works, and by adjusting voltage to realize to power regulation, the digital newspaper industry of output power is realized, to obtain
The good power regulation linearity and accuracy.Present invention employs the two stage power adjustment modes for determining frequency tune voltage, thus
So that inverter circuit 5 is always worked near resonance circuit intrinsic frequency, reduces the loss of inverter switching device pipe, improve inversion
Efficiency.
Copped wave filter circuit includes the first inductance L1 and the first capacitance C1 being serially connected, wherein inverter circuit 5 and copped wave
The tie point of filter circuit is arranged at the both ends of the first capacitance C1；Resonance circuit includes the second inductance L2, the second capacitance C2, third
Capacitance C3 and isolating transformer T, wherein second inductance L2, the second capacitance C2, third capacitance C3 are in series, the isolation transformation
One end of device T is in parallel with the third capacitance C3, and the other end of isolating transformer T is connect with heating load circuit 6.
First voltage sampling apparatus includes first resistor R1 and second resistance R2, one end of first resistor R1 and second resistance
One end of R2 connects, and the other end of first resistor R1, the other end of second resistance R2 are connected with the both ends of the first capacitance C1 respectively
It connects, the voltage sampling port of the voltage and current sampling ADC 10 is arranged between first resistor R1 and second resistance R2, and the first electric current is adopted
Sampling device is the current transformer CT1 being located between the first capacitance C1 and second resistance R2.
Second current sampling device is the current transformer CT2 being located between inverter circuit 5 and third capacitance C3, the second electricity
It includes the 3rd resistor R3 and winding being in parallel to press sampling apparatus, which connect with isolating transformer T, 3rd resistor R3's
One end is grounded, and the other end of 3rd resistor R3 is the output end of second voltage sampling apparatus.
It is equipped with phase shortage between the output end and single chip control unit 22 of electromagnetic interference filter circuit 1 and checks circuit 7.It should
Phase shortage checks that the detection of circuit 7 passes through treated power grid three phase mains A ' B ' C ', the testing result feed-in of electromagnetic interference filter circuit 1
Single chip control unit 22, when any phase voltage phase shortage in three-phase input, phase shortage checks that circuit 7 exports phase shortage alarm signal
To single chip control unit 22, the single chip control unit 22 correspondence makes corresponding processing, to ensure circuit safety.
+ 24V power supplys are circumscribed in single chip control unit 22, should+24V power supplys by Type of Switch Stabilivolt Source Circuit 21 with
Single chip control unit 22 connects.Type of Switch Stabilivolt Source Circuit 21 is depressured externally input+24V power supplys, voltage stabilizing, filtering
Processing, to provide stable supply voltage for single chip control unit 22 and other functional circuits.
Communication interface 20 is equipped in single chip control unit 22.Single chip control unit 22 passes through communication interface 20 and its
He contacts controller, more controls and monitoring function is realized, such as the setting of running parameter, reading of working condition etc..
Above-listed detailed description is illustrating for one of present invention possible embodiments, which is not to limit
The scope of the claims of the present invention, all equivalence enforcements or change without departing from carried out by the present invention are intended to be limited solely by the scope of the claims of this case
In.
Claims (7)
1. a kind of microcontroller controls high-frequency induction heating power, including sequentially connected electromagnetic interference filter circuit, industrial frequency rectifying
Circuit, power frequency filter circuit, chopper circuit, copped wave filter circuit, inverter circuit, resonance circuit and heating load circuit, should
The input terminal of electromagnetic interference filter circuit accesses power grid three phase mains, further includes phase monitor circuit, loop filter circuit, power
Computing circuit and single chip control unit, the single chip control unit include voltage and current sampling ADC, comparator, power samples
ADC, power compensator, voltage compensator, voltage adjustment DPWM, phase sample ADC, phase compensator, phase adjustment DPWM,
In, it is equipped with the first current sampling device, first voltage sampling apparatus in the output end of the copped wave filter circuit, which adopts
Sampling device, first voltage sampling apparatus are connect with the input terminal of the voltage and current sampling ADC, the voltage and current sampling ADC, ratio
Be sequentially connected compared with device, voltage adjustment DPWM, chopper circuit, the voltage and current sampling ADC, voltage compensator, voltage adjustment DPWM,
Chopper circuit is sequentially connected, and is equipped with the second current sampling device, second voltage sampling apparatus in the output end of resonance circuit, this
Two current sampling devices, second voltage sampling apparatus are connect with the input terminal of the Power arithmetic circuit, the Power arithmetic circuit,
Power samples ADC, power compensator, voltage compensator are sequentially connected；And second current sampling device, second voltage sampling cartridge
It sets and is connect with the input terminal of the phase monitor circuit, the phase monitor circuit, loop filter circuit, phase sample ADC, phase
Compensator, phase adjustment DPWM, inverter circuit are sequentially connected.
2. a kind of microcontroller according to claim 1 controls high-frequency induction heating power, it is characterised in that：The copped wave filter
Wave circuit includes the first inductance L1 and the first capacitance C1 being serially connected, wherein the inverter circuit and the copped wave filtered electrical
The tie point on road is arranged at the both ends of the first capacitance C1；The resonance circuit includes the second inductance L2, the second capacitance C2, third electricity
Hold C3 and isolating transformer T, wherein second inductance L2, the second capacitance C2, third capacitance C3 are in series, isolating transformer T
One end it is in parallel with the third capacitance C3, the other end of isolating transformer T is connect with the heating load circuit.
3. a kind of microcontroller according to claim 2 controls high-frequency induction heating power, it is characterised in that：First electricity
It includes first resistor R1 and second resistance R2 to press sampling apparatus, and one end of first resistor R1 is connect with one end of second resistance R2,
The other end of first resistor R1, the other end of second resistance R2 are connected with the both ends of the first capacitance C1 respectively, the voltage
The voltage sampling port of current sample ADC is arranged between first resistor R1 and second resistance R2, first current sampling device
For the current transformer CT1 being located between the first capacitance C1 and second resistance R2.
4. a kind of microcontroller according to claim 2 or 3 controls high-frequency induction heating power, it is characterised in that：Described
Two current sampling devices are the current transformer CT2 being located between the inverter circuit and the third capacitance C3, described second
Voltage sampling apparatus includes the 3rd resistor R3 and winding being in parallel, which connect with the isolating transformer T, third electricity
One end ground connection of R3 is hindered, the other end of 3rd resistor R3 is the output end of the second voltage sampling apparatus.
5. a kind of microcontroller according to claim 1 controls high-frequency induction heating power, it is characterised in that：In the electromagnetism
It is equipped with phase shortage between the output end of interference filter circuit and the single chip control unit and checks circuit.
6. a kind of microcontroller according to claim 1 controls high-frequency induction heating power, it is characterised in that：In the monolithic
It is circumscribed with+24V power supplys in machine control unit, is somebody's turn to do+24V power supplys and passes through Type of Switch Stabilivolt Source Circuit and the single chip control unit
Connection.
7. a kind of microcontroller according to claim 1 controls high-frequency induction heating power, it is characterised in that：In the monolithic
Machine control unit is equipped with communication interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610061061.8A CN105517217B (en) | 2016-01-28 | 2016-01-28 | A kind of microcontroller control high-frequency induction heating power |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610061061.8A CN105517217B (en) | 2016-01-28 | 2016-01-28 | A kind of microcontroller control high-frequency induction heating power |
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| CN105517217A CN105517217A (en) | 2016-04-20 |
| CN105517217B true CN105517217B (en) | 2018-11-06 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106708164B (en) * | 2017-02-10 | 2018-11-02 | 珠海凌达压缩机有限公司 | Circuit of power factor correction structure, control method and electric appliance |
| KR102125026B1 (en) * | 2018-05-17 | 2020-06-19 | 주식회사 뉴파워 프라즈마 | Resonant network For Plasma Power And Power Supply Apparatus For Plasma Generator |
| CN110752745B (en) * | 2019-10-30 | 2021-05-14 | 渤海大学 | Composite power control system of impedance self-matching type induction heating inverter power supply |
| CN111163543B (en) * | 2019-12-30 | 2022-04-08 | 亿夫曼（北京）科技有限公司 | Induction heating control method and device based on load characteristics |
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| US6271508B1 (en) * | 1998-07-10 | 2001-08-07 | Ameritherm, Inc. | System and method for providing RF power to a load |
| CN201088625Y (en) * | 2007-11-09 | 2008-07-23 | 上海沪通电子有限公司 | Double closed loops controlling system of high frequency electrotome |
| CN104811055A (en) * | 2015-04-22 | 2015-07-29 | 华南理工大学 | High power wideband ultrasonic power supply based on silicon carbide device and control method thereof |
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| EP0556116B1 (en) * | 1992-02-11 | 1996-09-25 | Lg Electronics Inc. | Circuit for compensating for output of high frequency induction heating cooker |
| US6271508B1 (en) * | 1998-07-10 | 2001-08-07 | Ameritherm, Inc. | System and method for providing RF power to a load |
| CN201088625Y (en) * | 2007-11-09 | 2008-07-23 | 上海沪通电子有限公司 | Double closed loops controlling system of high frequency electrotome |
| CN104811055A (en) * | 2015-04-22 | 2015-07-29 | 华南理工大学 | High power wideband ultrasonic power supply based on silicon carbide device and control method thereof |
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