CN109302753A - High-frequency heating apparatus - Google Patents
High-frequency heating apparatus Download PDFInfo
- Publication number
- CN109302753A CN109302753A CN201710605716.8A CN201710605716A CN109302753A CN 109302753 A CN109302753 A CN 109302753A CN 201710605716 A CN201710605716 A CN 201710605716A CN 109302753 A CN109302753 A CN 109302753A
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- China
- Prior art keywords
- inverter
- connects
- electric current
- heating apparatus
- frequency heating
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
Abstract
High-frequency heating apparatus of the invention includes a PWM generation device, an electric current-producing device, a switching device and a protective device.PWM generation device is to generate a control signal.Electric current-producing device connects PWM generation device by a transmission path, and exports an operating current a to coil load according to control signal.Switching device connects transmission path.Protective device connects electric current-producing device and switching device, and the feedback signal control switch device according to electric current-producing device, with the transmission path that is turned on or off.In this way, the device open circuit of protective device control switch, switching device can cut off transmission path directly to protect in time to electric current-producing device, and improve the stability of high-frequency heating apparatus.
Description
Technical field
The present invention is related with heating equipment, particularly relates to a kind of high-frequency heating apparatus.
Background technique
The protection circuit for comparing current high-frequency heating apparatus, for overcurrent, overvoltage protection using insurance
Silk or sensing element, then judged by control unit as protection, and the reaction time of this process is all larger than 1ms, for high frequency
For the protection of other elements in heating equipment and power supply device, which still dislikes too slow, therefore in high-frequency heating apparatus
Portion's electronic component still will receive load over-current and power surging harm, and has load short circuits and cause fuse and power supply device
The phenomenon that burning is caused user that must shut down the equipment of power supply and is repaired.
In addition to repairing itself using ancillary cost maintenance cost and time is above needed, if the equipment is production equipment person, also can
Therefore it results in lower production efficiency.
Furthermore protection circuit is usually to send the output signal for protecting circuit to PWM when protecting circuit start and produce at present
Then control signal is closed or do not exported to generating apparatus to inverter in control PWM generation device.But this mode is generated in PWM
Time delay is caused in the running of device, therefore protection can not be provided in time, to avoid the transistor damage of inverter.
Disclosure
(1) technical problems to be solved
In view of the above-mentioned deficiency, the purpose of the present invention is to provide a kind of high-frequency heating apparatus, start in protective device
When, the control signal input of inverter is closed, directly to reduce time delay caused by PWM generation device.
(2) technical solution
To reach above-mentioned purpose, high-frequency heating apparatus of the invention include a PWM generation device, an electric current-producing device,
One switching device and a protective device.PWM generation device is to generate a control signal.Electric current-producing device passes through a transmission road
Diameter connects PWM generation device, and exports an operating current a to coil load according to control signal.Switching device connection transmission road
Diameter.Protective device connects electric current-producing device and switching device, and the feedback signal control switch according to electric current-producing device
Device, with the transmission path that is turned on or off.
In this way, protective device starting can directly cut off transmission path to protect in time to electric current-producing device, with contracting
The time that short protective device is protected, and improve the stability of high-frequency heating apparatus.
Detailed configuration, feature, assembling or usage mode in relation to high-frequency heating apparatus provided by the present invention, will be in subsequent
Embodiment be described in detail in be described by.However, having usually intellectual in field of the present invention should be able to understand, this waits detailed
It describes in detail bright and implements specific embodiment cited by the present invention, be merely to illustrate the present invention, be not intended to limit the invention
Patent claim.
Detailed description of the invention
Fig. 1 is the composition block diagram of high-frequency heating apparatus of the invention.
Fig. 2 be first order current protecting circuit, switching device and the inverter of high-frequency heating apparatus of the invention wherein
The circuit diagram of one IGBT.
Fig. 3 is the block diagram of the temperature protection circuit of protective device.
Fig. 4 is the circuit diagram of the supervision timer of temperature protection circuit.
Fig. 5 is the block diagram of the voltage protection circuit of protective device.
Fig. 6 is the block diagram of the second level current protecting circuit of protective device.
[symbol description]
10 high-frequency heating apparatus 11PWM generation devices
111 transmission path, 13 electric current-producing device
131 inverter, 133 output matching device
135 rectifier, 137 first order current protecting circuit
1371 differential amplifier, 1373 comparator
1375 variable resistance, 1377 capacitor
15 switching device, 151 reverser
153,155,17 protective device of 251MOSFET
171 temperature protection circuit, 173 voltage protection circuit
175 second level current protecting circuit, 19 coil load
21,31,41 amplifier, 23,33,45 comparator
25 supervision timer, 253 timing unit
255 buffer cells 257OR
27,35,47 latch lock unit, 29,37,49 logic unit
43 full-wave rectifier D diodes
NCControl terminal NSPower end
NOOutput end VLLimit voltage
Specific embodiment
Hereinafter, hereby cooperating each attached drawing to enumerate corresponding preferred embodiment carrys out composition structure to high-frequency heating apparatus of the invention
Part and reach effect to explain.Component, size and the appearance of right each attached drawing medium-high frequency heating equipment are only used to illustrate the present invention
Technical characteristic, rather than limit the invention.
As shown in Figure 1, the figure is the block diagram of high-frequency heating apparatus 10 of the invention.High-frequency heating apparatus 10 of the invention wraps
Include a PWM generation device 11, an electric current-producing device 13, a switching device 15, a protective device 17 and a coil load 19.
PWM generation device 11 connects electric current-producing device 13 by a transmission path 111.PWM generation device 11 is to produce
Raw control signal, to control electric current-producing device 13.Switching device 15 connects transmission path 111.Protective device 17 connects electric current
Generation device 13 and switching device 15, and the feedback signal control switch device 15 according to electric current-producing device 13, so as to pass
Defeated path 111 is turned on or off.
Wherein, electric current-producing device 13 includes an inverter (INVERTER) 131, one output matching device 133, a rectifier
135 and multiple first order current protecting circuits 137.Inverter 131 has a control terminal NC, a power end NSAn and output end NO, control
End N processedCConnect transmission path 111, power end NSConnect rectifier 135, output end NOConnect output matching device 133.Output matching
Device 133 connects coil load 19.
Those skilled in the art can understand inverter 131 can be transistor (such as MOSFET or IGBT) composition full-bridge or
Half-bridge structure, in other words, inverter 131 have multiple transistors, then by taking IGBT as an example.Those first order current protecting circuits
137 be all identical structure, and connection type is also identical, therefore, with first order current protecting circuit 137, an inverter in figure
For 131 transistor circuit and switching circuit.First order current protecting circuit 137 connect 131 transistor of inverter and
Switching device 15, and to execute first order current protection, those skilled in the art can understand that first order current protecting circuit 137 is
One-to-one connection transistor and switching device 15.
The control signal of PWM generation device 11 is the one-to-one transistor for being supplied to inverter.Inverter 131 is according to control
Direct current is converted into high-frequency alternating current by signal, grid of the signal to input transistors is controlled, to trigger the crystal of inverter
Pipe.
Output matching device 133 receives the high-frequency alternating current of inverter 131 and output services electric current to coil load 19, so that
Coil load 19 works.Those skilled in the art understand that output matching device 133 includes the members such as transformer, resonant capacitance and resonant inductance
Part can be made of with the structure of coil load the magnetic conduction object of mold or the wound around coil of expects pipe.
As shown in Fig. 2, the figure is wherein the one of first order current protecting circuit 137, switching device 15 and inverter 131
The circuit diagram of IGBT.First order current protecting circuit 137 can power transformation including a differential amplifier 1371, a comparator 1373, one
Resistance 1375 and a capacitor 1377.Differential amplifier 1371 connects the emitter (E) of diode D and IGBT, and is connected in parallel electricity
Container 1377.The collector (C) of diode D connection IGBT.Comparator 1373 connects differential amplifier 1371, variable resistance 1375
And switching device 15.Switching device includes a reverser 151, a P channel MOSFET 153 and a N channel MOSFET 155.Instead
Comparator 1373 is connected to the input terminal of device 151, output end connects the grid (G) of MOSFET 153.The source of MOSFET 153
The drain electrode (D) of pole (S) connection MOSFET 155.The source electrode (S) of drain electrode (D) the connection MOSFET 155 of MOSFET 153, and even
Connect the grid (G) of the IGBT of inverter.
When overcurrent occurs for electric current-producing device 13, the voltage of IGBT and diode D and can increase, it is then, differential to put
Raised voltage value is processed into voltage signal and sends comparator 1373 to by big device 1371,1373 comparison voltage signal of comparator
With the limitation voltage V of comparator 1373L, when voltage signal is more than limitation voltage VLWhen, the output of comparator 1373 is filled with control switch
15 disconnections are set, to cut off the control terminal N of inverter 131CAnd pwm control signal is avoided to export to the power transistor of inverter.
It is cut-off that the disconnection of switching device 15, which represents MOSFET 153 and MOSFET 155 all, to disconnect transmission path 111.
Wherein, the limitation voltage V of comparator 1373LIt is the partial pressure of variable resistance 1375, therefore, adjusts variable resistance 1375
Resistance value can reach change limitation voltage VLPurpose.Differential amplifier 1371 can be isolation or non-isolated.
In first order current protection, when there is overcurrent (such as moment shoves or surging) in electric current-producing device, the
Primary current protection circuit 137 is immediately controlled switching device 15 and disconnects transmission path 111, to protect the IGBT of inverter 131, when
After overcurrent disappears, transmission path 111 is connected in first order current protection meeting driving switch device 15, so that inverter 131 can be just
Often work.Switching device 15 conducting be represent MOSFET 153 and MOSFET 155 all for conducting.
Referring again to Fig. 1, in the present embodiment, it is temperature, voltage and electricity respectively that there are three types of protection mechanisms for protective device 17
Stream, therefore, protective device include a temperature protection circuit 171, a voltage protection circuit 173 and a second level current protecting circuit
175, these three protection mechanisms and corresponding circuits composition are then described in detail.
Feedback signal control switch device 15 of the protective device 17 according to electric current-producing device 13, with the transmission that is turned on or off
Path 111, in this way, the configuration of protective device 17 and switching device 15 can accelerate high-frequency heating apparatus 10 enter guard mode when
Between.
As shown in figure 3, temperature protection circuit 171 includes an amplifier 21, a comparator 23, supervision timer 25, latch
Unit 27 and logic unit 29.Amplifier 21 connects inverter 131 and output matching device 133.Comparator 23 connects amplifier 21
And supervision timer 25.Latch lock unit 27 connects supervision timer 25 and logic unit 29, and the connection of logic unit 29, which spreads, closes dress
Set 15.
Amplifier 21 receives the temperature signal of inverter 131 and output matching device 133, and preliminary treatment temperature signal, just
Step processing is including stabilization signal and filters out noise.
Comparator 23 has a voltage reference value, and the amplified signal that reception amplifier 21 exports, and comparator 23 will amplify
Signal is compared with voltage reference value to export a transition signal.Wherein, one turn is generated when amplified signal is greater than voltage reference value
State signal.If amplified signal does not generate transition signal when being less than voltage reference value.
Supervision timer 25 receives transition signal, and carries out timing according to transition signal, and defeated to ability in the time of timing
A trigger signal out.If no transition signal generates, supervision timer 25 will not be operated.
After latch lock unit 27 receives trigger signal, trigger signal is lockked to avoid protective device reset, and secondary damage is high
Frequency heating equipment.Latch lock unit 27 locks one protection signal of output after trigger signal, and logic unit 29 is according to protection signal triggering
Switching device 15 disconnects, to end the transmission path 111 of PWM generation device 11 Yu inverter 131.
As shown in figure 4, the figure is the circuit diagram of supervision timer 25.Supervision timer 25 includes a MOSFET 251, one
Timing unit 253, a buffer cell 255 and OR door 257.MOSFET 251 is P channel, and its grid (G) connects comparator
23, and receive transition signal.The source electrode (S) of MOSFET 251 connects a DC power supply, and the drain electrode (D) of MOSFET 251 connects meter
The power input of Shi Danyuan 253.The input terminal of the output end connection OR door 257 of timing unit 253.Buffer cell 255 it is defeated
Outlet connects comparator 23, and receives transition signal, the input terminal of the output end connection OR door 257 of buffer cell 255.OR
257 output end connects latch lock unit 27.
MOSFET and buffer cell all conductings when receiving transition signal, and MOSFET triggering timing unit starts to count
When, the present embodiment is timing 3 seconds, and then timing unit then exported low level signal, simultaneous buffering unit at timing 3 seconds
Also low level signal is exported, such goalkeeper OR exports low level, with trigger latch unit.When transition signal belongs to high levle signal
When, MOSFET is off, and such timing unit will not carry out timing.Because when transition signal is needed via timing unit processing
Between, it is therefore, synchronous by the signal of OR two input terminals by buffer cell.
In other words, supervision timer 25 is during timing (in 3 seconds i.e. aforementioned), if comparator 23 exports transition signal
Previous state, previous state is normal condition, indicate supervision timer 25 can stop timing, in this way, reaching the function of monitoring.
Wherein, in the present embodiment, timing unit selects the integrated circuit of 555 timers known to this field.People from this field
Member can understand buffer cell or OR can also using integrated circuit component or transistor composition, more optional NOR gate or its
The combination of his logic gate.In addition, MOSFET can also be using the combination of N channel or N channel and P channel MOSFET.
As shown in figure 5, voltage protection circuit 173 is patrolled including an amplifier 31, a comparator 33, a latch lock unit 35 and one
Collect unit 37.The power end and output end of the connection inverter 131 of amplifier 31.Comparator 33 connects amplifier 31 and latch lock unit
35.Logic unit 37 connects latch lock unit 35 and switching device 15.
Wherein, the effect of the amplifier 31 of voltage protection circuit 173, comparator 33, latch lock unit 35 and logic unit 37
And function is substantially identical as aforementioned temperature protection circuit 171, same section is repeated no more in this.The difference is that voltage is protected
The amplifier 31 of protection circuit 173 is power end voltage and the output end voltage of foundation inverter 131 to do subsequent protection control.
As shown in fig. 6, second level current protecting circuit 175 include an amplifier 41, full-wave rectifier 43, comparator 45,
Latch lock unit 47 and logic unit 49.The power end and output end of the connection inverter 131 of amplifier 41.Full-wave rectifier 43 connects
Amplifier 41 and comparator 45.Latch lock unit 47 connects comparator 45 and logic unit 49.49 connecting switch of logic unit
15。
Wherein, the amplifier 41, comparator 45, latch lock unit 47 and logic unit 49 of second level current protecting circuit 175
Effect and function substantially with aforementioned temperature protection circuit 171 it is identical, same section is repeated no more in this.The difference is that
Full-wave rectifier 45 is to be rectified into direct current for high-frequency alternating current, so that comparator 45 carries out signal processing.Second level electric current
The amplifier 41 of protection circuit 175 is power end electric current and the output end current of foundation inverter 131 to do subsequent protection control
System.
It should be noted that aforementioned first order current protection is can to automatically reset, that is, first order current protecting circuit is not
Overcurrent condition can be lockked, and can be changed and actuation with electric current.The second level is protected then because there is latch lock unit 47, the
Second class protection needs hand-reset.Second level protection then occurs after inverter normal work, can when overcurrent occurs in device
By the second level protect in latch lock unit 47 lock malfunction, cause the secondary damage of device to avoid resetting.
In the present embodiment, the logic unit of above-mentioned three kinds of protections circuit be select there are three input terminal and door or with it is non-
Door, those skilled in the art know that can pass through active member with door or NAND gate forms or select integrated circuit component.Because of choosing
With three input terminals and door or NAND gate, therefore, the logic unit of above-mentioned three kinds of protections circuit is can be integrated into a member
Part.Also, the element of more input terminals can be selected in such logic unit if protective device has other to protect circuit.
In addition, switching circuit other than the structure that Fig. 2 is painted, is also possible to the switch of other circuits composition, therefore not with this
Figure is depicted as limiting.Also, because transmission path be it is multiple, switching circuit is the quantity of corresponding transmission path, therefore not with one
It is limited.
In conclusion the present invention carries out various protection by the way of hardware circuit, for high-frequency heating apparatus, when any
When protecting circuit start, the transmission path of pwm control signal can be directly cut off, can effectively accelerate guard time, increases high frequency and adds
Hot stabilization of equipment performance.
Finally, emphasizing, composition element of the present invention disclosed by preceding taking off in embodiment is not used to by way of example only
The range of this case, the substitution or variation of other equivalence elements are limited, the claim that also should be this case is covered.
Claims (10)
1. a kind of high-frequency heating apparatus, comprising:
One PWM generation device, to generate a control signal；
One electric current-producing device connects the PWM generation device by a transmission path, and according to one work of control signal output
Electric current is to a coil load；
One switching device connects the transmission path；And
One protective device connects the electric current-producing device and the switching device, and the feedback signal according to electric current-producing device
The switching device is controlled, with the transmission path that is turned on or off.
2. high-frequency heating apparatus as described in claim 1, wherein the electric current-producing device includes an inverter and multiple first
Grade current protecting circuit, the inverter have multiple transistors, those first order current protecting circuits connect the switching device and should
The collector and emitter of a little transistors, and receive the collector of those transistors and the feedback signal of emitter.
3. high-frequency heating apparatus as described in claim 1, wherein each first order current protecting circuit includes a differential amplification
Device, a comparator and a variable resistance, the differential amplifier connect the collector and emitter of the transistor, which connects
Connect the differential amplifier, the variable resistance and the switch electric device.
4. high-frequency heating apparatus as described in claim 1, wherein the electric current-producing device includes an inverter and an output
Orchestration, a control terminal of the inverter connect the transmission path, and the output end of the inverter connects the output matching device, the protection
Device includes a temperature protection circuit, which controls this according to the temperature of the inverter and the output matching device
Switching device, the feedback signal are temperature signals.
5. high-frequency heating apparatus as claimed in claim 4, wherein the temperature protection circuit include an amplifier, a comparator,
One supervision timer, a latch lock unit and a logic unit, the amplifier receive the inverter and the temperature of the output matching device
Signal, and the comparator is connected, which connects the comparator and latch lock unit, which connects the latch list
Member and the switching device.
6. high-frequency heating apparatus as described in claim 1, wherein the electric current-producing device includes an inverter, an output
Orchestration and a rectifier, a control terminal of the inverter connect the transmission path, and an output end of the inverter connects the output
One power end of adaptation, the inverter connects the rectifier, which includes a voltage protection circuit, the voltage protection
Circuit controls the switching device according to the power end of the inverter and the voltage of output end, which is voltage signal.
7. high-frequency heating apparatus as claimed in claim 6, wherein the voltage protection circuit include an amplifier, a comparator,
One latch lock unit and a logic unit, the amplifier connect the power end and output end of the inverter, which connects this and put
Big device and the latch lock unit, the latch lock unit connect the comparator and the logic unit, which connects the switching device.
8. the high-frequency heating apparatus as described in right benefit requires 1, wherein the electric current-producing device includes an inverter, an output
Adaptation and a rectifier, a control terminal of the inverter connect the transmission path, and it is defeated that an output end of the inverter connects this
One power end of adaptation out, the inverter connects the rectifier, which includes a second level current protecting circuit, should
Second level current protecting circuit controls the switching device according to the power end of the inverter and the electric current of output end, the feedback letter
It number is current signal.
9. high-frequency heating apparatus as claimed in claim 8, wherein the second level current protecting circuit includes an amplifier, one
Full-wave rectifier, a comparator, a latch lock unit and a logic unit, the amplifier connect power end and the output of the inverter
End, the full-wave rectifier connect the amplifier and the comparator, which connects the comparator and the logic unit, this is patrolled
It collects unit and connects the switching device.
10. high-frequency heating apparatus as claimed in claim 1 or 2, wherein the electric current-producing device includes an inverter, one defeated
Adaptation and a rectifier out, a control terminal of the inverter connect the transmission path, and the output end connection of the inverter should
One power end of output matching device, the inverter connects the rectifier, which includes a temperature protection circuit, a voltage
Protect circuit and a second level current protecting circuit, temperature of the temperature protection circuit according to the inverter and the output matching device
The switching device is controlled, which controls the switch according to the power end of the inverter and the voltage of output end
Device, the second level current protecting circuit control the switching device according to the power end of the inverter and the electric current of output end,
The feedback signal includes temperature signal, voltage signal and current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710605716.8A CN109302753A (en) | 2017-07-24 | 2017-07-24 | High-frequency heating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710605716.8A CN109302753A (en) | 2017-07-24 | 2017-07-24 | High-frequency heating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109302753A true CN109302753A (en) | 2019-02-01 |
Family
ID=65167597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710605716.8A Pending CN109302753A (en) | 2017-07-24 | 2017-07-24 | High-frequency heating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109302753A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781969A (en) * | 2020-07-23 | 2020-10-16 | 上海华力微电子有限公司 | Temperature control circuit, device and chip packaging test system |
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Application publication date: 20190201 |