CN104039032A - Electromagnetic heating circuit and control method and control device thereof - Google Patents
Electromagnetic heating circuit and control method and control device thereof Download PDFInfo
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- CN104039032A CN104039032A CN201410232434.4A CN201410232434A CN104039032A CN 104039032 A CN104039032 A CN 104039032A CN 201410232434 A CN201410232434 A CN 201410232434A CN 104039032 A CN104039032 A CN 104039032A
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Abstract
The invention provides an electromagnetic heating circuit and a control method and a control device of the electromagnetic heating circuit. The electromagnetic heating circuit comprises a power supply module for processing mains supply so as to obtain direct current in a predetermined cycle, a resonance circuit, a transistor connected to the second end and the ground of a resonance circuit, a capacitor element and a switch, wherein the first end of the resonance circuit is connected to the output end of the power supply module, the switch is in series connection with the capacitor element and then connected between the first end and the ground of the resonance circuit. By adopting the technical scheme, large pulse current can be prevented from being produced in the circuit when the transistor is connected for the first time, and noise produced by the hysteresis effect can be reduced.
Description
Technical field
The present invention relates to have the technical field of electric appliances of electromagnetic induction, in particular to the control method of a kind of electromagnetic heating circuit, a kind of electromagnetic heating circuit and a kind of control device of electromagnetic heating circuit.
Background technology
The electromagnetic heating circuit proposing in correlation technique as shown in Figure 1, connect with resonant circuit 104 by rectifier circuit 102, and transistor 106 (can be insulated gate bipolar transistor, i.e. IGBT) is connected between resonant circuit 104 and ground.Wherein, the voltage waveform at output 108 places of rectifier circuit 102 as shown in Figure 2, be the voltage max U of civil power after rectifier circuit 102 rectifications are processed, cause within each heating cycle of electromagnetic heating circuit, if transistor 106 is open-minded first, in circuit, can produce tens amperes, even surpass the pulse current of 100 amperes.This Pulse Electric fails to be convened for lack of a quorum to producing certain influence the useful life of transistor 106, is opening moment simultaneously, because the pulse current producing is larger, can be subject to the impact of hysteresis effect, produces larger noise.
Therefore, how to avoid when transistor conducting first, producing larger pulse current, and the noise reducing because of hysteresis effect generation becomes technical problem urgently to be resolved hurrily.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art or correlation technique.
For this reason, one object of the present invention is to have proposed a kind of transistor of can avoiding when conducting first, produces larger pulse current in circuit, and can reduce the electromagnetic heating circuit of the noise producing because of hysteresis effect.
Another object of the present invention has been to propose a kind of control method and control device of electromagnetic heating circuit.
For achieving the above object, embodiment according to a first aspect of the invention, has proposed a kind of electromagnetic heating circuit, comprising: power module, for civil power is processed, to obtain the direct current of predetermined period; Resonant circuit, the first end of described resonant circuit is connected to the output of described power module; Transistor, described transistor is connected between second end and ground of described resonant circuit; Capacity cell; And switch, and described capacity cell is connected between the first end and ground of described resonant circuit after being connected in series.
Electromagnetic heating circuit according to an embodiment of the invention, by being connected between the first end and ground of resonant circuit after capacity cell is connected with switch, make when switch disconnects, the waveform of the output end voltage of power module can keep the galvanic waveform consistent (being the voltage waveform of civil power after full-wave rectification) of processing through rectification circuit rectification with civil power, and then within the heating cycle of electromagnetic heating circuit, can control transistor conducting first when the output end voltage of power module is lower, thereby reduced the pulse current that transistor produces in circuit during conducting first within each heating cycle, avoid larger pulse current to affect transistorized useful life.Meanwhile, because the pulse current producing in circuit is less, therefore effectively reduced the noise that hysteresis effect produces.
In addition, electromagnetic heating circuit according to the above embodiment of the present invention, can also have following additional technical characterictic:
According to one embodiment of present invention, described power module comprises: rectification circuit, is connected to described civil power, for described civil power is carried out to rectification processing, to export described direct current.
Electromagnetic heating circuit according to an embodiment of the invention, rectification circuit can be rectifier circuit, so that civil power is carried out to full-wave rectification.As an alternative embodiment of the invention, power module can also comprise filter circuit, is connected to rectification circuit, for the direct current of rectification circuit output is carried out to filtering processing.
According to the embodiment of second aspect present invention, a kind of control method of electromagnetic heating circuit has also been proposed, for controlling the electromagnetic heating circuit described in above-mentioned any one embodiment, comprising: the output end voltage that detects described power module; Controlling described switch disconnects, within each heating cycle of described electromagnetic heating circuit, if described output end voltage detected first, be less than or equal to predetermined threshold, control described switch closed, and after predetermined time interval, control the action that described transistor is carried out conducting first.
The control method of electromagnetic heating circuit according to an embodiment of the invention, by controlling the switch being connected with capacity cell, disconnect, make the waveform of the output end voltage of power module keep the galvanic waveform consistent (being the voltage waveform of civil power after full-wave rectification) of processing through rectification circuit rectification with civil power, and then within the heating cycle of electromagnetic heating circuit, can control transistor and when the output end voltage of power module is lower, carry out the action of conducting first, thereby reduced the pulse current that transistor produces in circuit during conducting first within each heating cycle, avoid larger pulse current to affect transistorized useful life.Meanwhile, because the pulse current producing in circuit is less, therefore effectively reduced the noise that hysteresis effect produces.Wherein, should guarantee when predetermined time interval is set after the predetermined time interval through setting, the output end voltage of power module does not reach maximum (or threshold value of setting), and predetermined time interval can be 0.
According to one embodiment of present invention, also comprise: within each heating cycle of described electromagnetic heating circuit, if described output end voltage detected for the last time, be less than or equal to described predetermined threshold, control described switch and disconnect, and control described transistor and turn-off.
The control method of electromagnetic heating circuit according to an embodiment of the invention, preferably, predetermined threshold can be 0, i.e. the minimum value of the output end voltage of power module, to guarantee that, when switch disconnects, the capacity cell of connecting with switch can discharge completely.
According to one embodiment of present invention, described predetermined threshold is less than the maximum of described output end voltage.
According to one embodiment of present invention, during the minimum value that is described output end voltage at described predetermined threshold, described predetermined time interval is less than half of described predetermined period.
The control method of electromagnetic heating circuit according to an embodiment of the invention, as a kind of preferred embodiment, predetermined threshold can be 0, within each heating cycle, if the output end voltage of power module being detected is first 0, control switch is closed, simultaneously after predetermined time interval, controls transistor conducting first.Wherein, at predetermined threshold, it is 0 o'clock, predetermined time interval is less than half of galvanic voltage cycle of power module output, to avoid predetermined time interval to equal a half of galvanic voltage cycle, when the output end voltage of power module is controlled transistor conducting first in maximum, in circuit, produce larger pulse current to impacting transistorized useful life.
According to the embodiment of third aspect present invention, a kind of control device of electromagnetic heating circuit has also been proposed, for controlling the electromagnetic heating circuit described in above-mentioned any one embodiment, comprising: detecting unit, for detection of the output end voltage of described power module; Control unit, being used for controlling described switch disconnects, and within each heating cycle of described electromagnetic heating circuit, if detecting described output end voltage first, described detecting unit is less than or equal to predetermined threshold, control described switch closed, and after predetermined time interval, control the action that described transistor is carried out conducting first.
The control device of electromagnetic heating circuit according to an embodiment of the invention, by controlling the switch being connected with capacity cell, disconnect, make the waveform of the output end voltage of power module keep the galvanic waveform consistent (being the voltage waveform of civil power after full-wave rectification) of processing through rectification circuit rectification with civil power, and then within the heating cycle of electromagnetic heating circuit, can control transistor and when the output end voltage of power module is lower, carry out the action of conducting first, thereby reduced the pulse current that transistor produces in circuit during conducting first within each heating cycle, avoid larger pulse current to affect transistorized useful life.Meanwhile, because the pulse current producing in circuit is less, therefore effectively reduced the noise that hysteresis effect produces.Wherein, should guarantee when predetermined time interval is set after the predetermined time interval through setting, the output end voltage of power module does not reach maximum (or threshold value of setting), and predetermined time interval can be 0.
According to one embodiment of present invention, described control unit also for: within each heating cycle of described electromagnetic heating circuit, if detecting described output end voltage for the last time, described detecting unit is less than or equal to described predetermined threshold, control described switch and disconnect, and control described transistor and turn-off.
The control device of electromagnetic heating circuit according to an embodiment of the invention, preferably, predetermined threshold can be 0, i.e. the minimum value of the output end voltage of power module, to guarantee that, when switch disconnects, the capacity cell of connecting with switch can discharge completely.
According to one embodiment of present invention, described predetermined threshold is less than the maximum of described output end voltage.
According to one embodiment of present invention, during the minimum value that is described output end voltage at described predetermined threshold, described predetermined time interval is less than half of described predetermined period.
The control method of electromagnetic heating circuit according to an embodiment of the invention, as a kind of preferred embodiment, predetermined threshold can be 0, within each heating cycle, if the output end voltage of power module being detected is first 0, control switch is closed, simultaneously after predetermined time interval, controls transistor conducting first.Wherein, at predetermined threshold, it is 0 o'clock, predetermined time interval is less than half of galvanic voltage cycle of power module output, to avoid predetermined time interval to equal a half of galvanic voltage cycle, when the output end voltage of power module is controlled transistor conducting first in maximum, in circuit, produce larger pulse current to impacting transistorized useful life.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 shows the structural representation of the electromagnetic heating circuit in correlation technique;
Fig. 2 shows the waveform schematic diagram of the output end voltage of power module in the electromagnetic heating circuit in correlation technique;
Fig. 3 shows the structural representation of electromagnetic heating circuit according to an embodiment of the invention;
Fig. 4 shows the schematic flow diagram of the control method of electromagnetic heating circuit according to an embodiment of the invention;
The oscillogram of the output voltage that Fig. 5 shows power module in electromagnetic heating circuit according to an embodiment of the invention when switch disconnects;
Fig. 6 shows the sequential chart to switch and transistor controls according to an embodiment of the invention;
Fig. 7 shows the schematic block diagram of the control device of electromagnetic heating circuit according to an embodiment of the invention.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the application's embodiment and the feature in embodiment can combine mutually.
A lot of details have been set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 3 shows the structural representation of electromagnetic heating circuit according to an embodiment of the invention.
As shown in Figure 3, electromagnetic heating circuit 300 according to an embodiment of the invention, comprising: power module 302, for civil power is processed, to obtain the direct current of predetermined period; Resonant circuit 304, the first end of described resonant circuit 304 is connected to the output of described power module 302; Transistor 306, described transistor is connected between second end and ground of described resonant circuit 304; Capacity cell 308; And switch 310, and described capacity cell 308 is connected between the first end and ground of described resonant circuit 304 after being connected in series.
By after capacity cell 308 is connected with switch 310, be connected between the first end and ground of resonant circuit 304, make when switch 310 disconnects, the waveform of the output end voltage of power module 302 can keep the galvanic waveform consistent (being the voltage waveform of civil power after full-wave rectification) of processing through rectification circuit 3022 rectifications with civil power, and then within the heating cycle of electromagnetic heating circuit 300, can control transistor 306 conducting first when the output end voltage of power module 302 is lower, thereby reduced the pulse current that transistor 306 produces in circuit during conducting first within each heating cycle, avoid larger pulse current to affect the useful life of transistor 306.Meanwhile, because the pulse current producing in circuit is less, therefore effectively reduced the noise that hysteresis effect produces.Wherein, switch 310 can be mechanical switch, can be also electronic switch, as transistor etc.
In addition, electromagnetic heating circuit 300 according to the above embodiment of the present invention, can also have following additional technical characterictic:
According to one embodiment of present invention, described power module 302 comprises: rectification circuit 3022, is connected to described civil power, for described civil power is carried out to rectification processing, to export described direct current.
Rectification circuit 3022 can be rectifier circuit, so that civil power is carried out to full-wave rectification.As an alternative embodiment of the invention, power module 302 can also comprise filter circuit (not shown), is connected to rectification circuit 3022, for the direct current of rectification circuit 3022 outputs is carried out to filtering processing.
Fig. 4 shows the schematic flow diagram of the control method of electromagnetic heating circuit according to an embodiment of the invention.
As shown in Figure 4, the control method of electromagnetic heating circuit according to an embodiment of the invention, the electromagnetic heating circuit 300 for shown in control chart 3, comprising: step 402, detects the output end voltage of the power module 302 shown in Fig. 3; Step 404, switch 310 shown in control chart 3 disconnects, within each heating cycle of described electromagnetic heating circuit 300, if described output end voltage detected first, be less than or equal to predetermined threshold, control described switch 310 closures, and after predetermined time interval, control the action that described transistor 306 is carried out conducting first.
By controlling the switch 310 being connected with capacity cell 308, disconnect, making the waveform of the output end voltage of power module 302 keep consistent through the galvanic waveform of rectification circuit rectification processing with civil power (is the voltage waveform of civil power after full-wave rectification, as shown in Figure 5), and then within the heating cycle of electromagnetic heating circuit 300, can control transistor 306 and when the output end voltage of power module 302 is lower, carry out the action of conducting first, thereby reduced the pulse current that transistor 306 produces in circuit during conducting first within each heating cycle, avoid larger pulse current to affect the useful life of transistor 306.Meanwhile, because the pulse current producing in circuit is less, therefore effectively reduced the noise that hysteresis effect produces.Wherein, should guarantee when predetermined time interval is set after the predetermined time interval through setting, the output end voltage of power module does not reach maximum (or threshold value of setting), and predetermined time interval can be 0.
According to one embodiment of present invention, also comprise: within each heating cycle of described electromagnetic heating circuit 300, if described output end voltage detected for the last time, be less than or equal to described predetermined threshold, control described switch 310 and disconnect, and control described transistor 306 and turn-off.
Preferably, predetermined threshold can be 0, i.e. the minimum value of the output end voltage of power module 302, to guarantee that the capacity cell 308 of connecting with switch 310 can discharge completely when switch 310 disconnects.
According to one embodiment of present invention, described predetermined threshold is less than the maximum of described output end voltage.
According to one embodiment of present invention, during the minimum value that is described output end voltage at described predetermined threshold, described predetermined time interval is less than half of described predetermined period.
Particularly, when switch 310 disconnects, the output end voltage waveform of power module 302 as shown in Figure 5, as a kind of preferred embodiment, predetermined threshold can be 0, within each heating cycle, if the output end voltage of power module 302 being detected is first 0, control switch 310 closures, simultaneously after predetermined time interval, control transistor 306 conducting first.Wherein, at predetermined threshold, it is 0 o'clock, predetermined time interval is less than half of galvanic voltage cycle of power module 302 output, to avoid predetermined time interval to equal a half of galvanic voltage cycle, when the output end voltage of power module 302 is controlled transistor 306 conducting first in maximum (being the U value in Fig. 5), in circuit, produce larger pulse current to impacting the useful life of transistor 306.
Wherein, above-mentioned according to the concrete sequential chart of the output end voltage control switch 310 of power module 302 and transistor 306 with reference to shown in Fig. 6.
Fig. 6 shows the sequential chart to switch and transistor controls according to an embodiment of the invention.
Wherein, in Fig. 6, take and switch 310 is controlled as example and described as 0 o'clock at the output end voltage that power module 302 detected.
As shown in Figure 6, oscillogram 602 is when switch 310 disconnects, the oscillogram of the output end voltage of power module 302, it should be noted that, when switch 310 switches to closure by disconnection change, the output end voltage of power module 302 can gradually become waveform as shown in Figure 2 by the waveform after full-wave rectification by civil power; And switched to while disconnecting by closure at switch 310, the output end voltage of power module 302 can become by civil power the waveform after full-wave rectification from waveform as shown in Figure 2.But, in the present embodiment, in oscillogram 602, omitted the part of waveform transformation.
Waveform 608 is the heating sequential chart of electromagnetic heating circuit 300, in heating cycle, in T, heats, at t
1in time, do not heat.
Oscillogram 604 is the control sequential chart of switch 310, in a heating cycle T of electromagnetic heating circuit 300, if the output end voltage of power module 302 reaches minimum value (0) first, control switch 310 closures, and in a heating cycle T, when the output end voltage that power module 302 detected for the last time reaches minimum value (0), control switch 310 disconnects, in figure at t
2closed in time, the time period t not heating at electromagnetic heating circuit 300
1interior switch 310 disconnects.
Oscillogram 606 is the control sequential chart of transistor 306, in a heating cycle T of electromagnetic heating circuit 300, if the output end voltage of power module 302 reaches minimum value (0) first, and through predetermined time interval t
3after, to transistor 306, send the signal 6062 of conducting first; In a heating cycle T, when the output end voltage that power module 302 detected for the last time reaches minimum value (0), control transistor 306 and turn-off.T wherein
3be less than a half period of oscillogram 602.
Fig. 7 shows the schematic block diagram of the control device of electromagnetic heating circuit according to an embodiment of the invention.
As shown in Figure 7, the control device 700 of electromagnetic heating circuit according to an embodiment of the invention, the electromagnetic heating circuit 300 for shown in control chart 3, comprising: detecting unit 702, for detection of the output end voltage of the power module 302 shown in Fig. 3; Control unit 704, for the switch 310 shown in control chart 3, disconnect, and within each heating cycle of described electromagnetic heating circuit 300, if detecting described output end voltage first, described detecting unit 702 is less than or equal to predetermined threshold, control described switch 310 closures, and after predetermined time interval, control the action that described transistor 306 is carried out conducting first.
By controlling the switch 310 being connected with capacity cell 308, disconnect, making the waveform of the output end voltage of power module 302 keep consistent through the galvanic waveform of rectification circuit rectification processing with civil power (is the voltage waveform of civil power after full-wave rectification, as shown in Figure 5), and then within the heating cycle of electromagnetic heating circuit 300, can control transistor 306 and when the output end voltage of power module 302 is lower, carry out the action of conducting first, thereby reduced the pulse current that transistor 306 produces in circuit during conducting first within each heating cycle, avoid larger pulse current to affect the useful life of transistor 306.Meanwhile, because the pulse current producing in circuit is less, therefore effectively reduced the noise that hysteresis effect produces.Wherein, should guarantee when predetermined time interval is set after the predetermined time interval through setting, the output end voltage of power module does not reach maximum (or threshold value of setting), and predetermined time interval can be 0.
According to one embodiment of present invention, described control unit 704 also for: within each heating cycle of described electromagnetic heating circuit 300, if detecting described output end voltage for the last time, described detecting unit 702 is less than or equal to described predetermined threshold, control described switch 310 and disconnect, and control described transistor 306 and turn-off.
Preferably, predetermined threshold can be 0, i.e. the minimum value of the output end voltage of power module 302, to guarantee that the capacity cell 308 of connecting with switch 310 can discharge completely when switch 310 disconnects.
According to one embodiment of present invention, described predetermined threshold is less than the maximum of described output end voltage.
According to one embodiment of present invention, during the minimum value that is described output end voltage at described predetermined threshold, described predetermined time interval is less than half of described predetermined period.
Particularly, when switch 310 disconnects, the output end voltage waveform of power module 302 as shown in Figure 5, as a kind of preferred embodiment, predetermined threshold can be 0, within each heating cycle, if the output end voltage of power module 302 being detected is first 0, control switch 310 closures, simultaneously after predetermined time interval, control transistor 306 conducting first.Wherein, at predetermined threshold, it is 0 o'clock, predetermined time interval is less than half of galvanic voltage cycle of power module 302 output, to avoid predetermined time interval to equal a half of galvanic voltage cycle, when the output end voltage of power module 302 is controlled transistor 306 conducting first in maximum (being the U value in Fig. 5), in circuit, produce larger pulse current to impacting the useful life of transistor 306.
More than be described with reference to the accompanying drawings technical scheme of the present invention, consider in correlation technique, transistor in electromagnetic heating circuit is within each heating cycle during conducting first, in circuit, can produce larger impulse circuit, affect transistorized useful life, simultaneously can be because hysteresis effect produces larger noise.Therefore, the present invention proposes a kind of new electromagnetic heating circuit, and corresponding control program, can avoid transistor when conducting first, in circuit, produce larger pulse current, and can reduce the noise producing because of hysteresis effect.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an electromagnetic heating circuit, is characterized in that, comprising:
Power module, for civil power is processed, to obtain the direct current of predetermined period;
Resonant circuit, the first end of described resonant circuit is connected to the output of described power module;
Transistor, described transistor is connected between second end and ground of described resonant circuit;
Capacity cell; And
Switch, and described capacity cell is connected between the first end and ground of described resonant circuit after being connected in series.
2. electromagnetic heating circuit according to claim 1, is characterized in that, described power module comprises:
Rectification circuit, is connected to described civil power, for described civil power is carried out to rectification processing, to export described direct current.
3. a control method for electromagnetic heating circuit, is characterized in that, for controlling electromagnetic heating circuit as claimed in claim 1 or 2, comprising:
Detect the output end voltage of described power module;
Controlling described switch disconnects, within each heating cycle of described electromagnetic heating circuit, if described output end voltage detected first, be less than or equal to predetermined threshold, control described switch closed, and after predetermined time interval, control the action that described transistor is carried out conducting first.
4. the control method of electromagnetic heating circuit according to claim 3, is characterized in that, also comprises:
Within each heating cycle of described electromagnetic heating circuit, if described output end voltage detected for the last time, be less than or equal to described predetermined threshold, control described switch and disconnect, and control described transistor and turn-off.
5. according to the control method of the electromagnetic heating circuit described in claim 3 or 4, it is characterized in that, described predetermined threshold is less than the maximum of described output end voltage.
6. the control method of electromagnetic heating circuit according to claim 5, is characterized in that, during the minimum value that is described output end voltage at described predetermined threshold, described predetermined time interval is less than half of described predetermined period.
7. a control device for electromagnetic heating circuit, is characterized in that, for controlling electromagnetic heating circuit as claimed in claim 1 or 2, comprising:
Detecting unit, for detection of the output end voltage of described power module;
Control unit, being used for controlling described switch disconnects, and within each heating cycle of described electromagnetic heating circuit, if detecting described output end voltage first, described detecting unit is less than or equal to predetermined threshold, control described switch closed, and after predetermined time interval, control the action that described transistor is carried out conducting first.
8. the control device of electromagnetic heating circuit according to claim 7, is characterized in that, described control unit also for:
Within each heating cycle of described electromagnetic heating circuit, if detecting described output end voltage for the last time, described detecting unit is less than or equal to described predetermined threshold, control described switch and disconnect, and control described transistor and turn-off.
9. according to the control device of the electromagnetic heating circuit described in claim 7 or 8, it is characterized in that, described predetermined threshold is less than the maximum of described output end voltage.
10. the control device of electromagnetic heating circuit according to claim 9, is characterized in that, during the minimum value that is described output end voltage at described predetermined threshold, described predetermined time interval is less than half of described predetermined period.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410232434.4A CN104039032B (en) | 2014-05-28 | 2014-05-28 | Electromagnetic heating circuit and control method thereof and control device |
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| CN201410232434.4A CN104039032B (en) | 2014-05-28 | 2014-05-28 | Electromagnetic heating circuit and control method thereof and control device |
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| CN104039032A true CN104039032A (en) | 2014-09-10 |
| CN104039032B CN104039032B (en) | 2016-06-29 |
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| CN104039032B (en) | 2016-06-29 |
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