CN206353871U - The switching tube protection circuit and electromagnetic heater of electromagnetic heater - Google Patents
The switching tube protection circuit and electromagnetic heater of electromagnetic heater Download PDFInfo
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- CN206353871U CN206353871U CN201621444111.2U CN201621444111U CN206353871U CN 206353871 U CN206353871 U CN 206353871U CN 201621444111 U CN201621444111 U CN 201621444111U CN 206353871 U CN206353871 U CN 206353871U
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Abstract
The utility model discloses a kind of electromagnetic heater and its switching tube protection circuit, the circuit includes：Voltage surge detection unit, it is connected with AC power, and it detects signal by detecting the surge voltage of AC power to generate surge；Gate-controlled switch, to control the resonant parameter of resonance circuit in electromagnetic heater to be changed；Main control unit; the output end that its protection end is detected with voltage surge is connected; its control signal output is connected with the gate pole of switching tube; it switchs control output end and is connected with the control end of gate-controlled switch; stop outputing control signals to switching tube when it detects that signal judges that surge voltage occurs in AC power according to surge; and by controlling gate-controlled switch to change the resonant parameter of resonance circuit, to reduce the voltage that switching tube is born.Thus, by changing the resonant parameter of resonance circuit while stopping outputing control signals to switching tube, the voltage that switch pipe collector is born can be reduced, the Surge handling capability of circuit is improved.
Description
Technical field
The utility model is related to household electrical appliance technical field, the switch protection of pipe electricity of more particularly to a kind of electromagnetic heater
Road and a kind of electromagnetic heater.
Background technology
In the related art, electromagnetic heater can typically set voltage surge protection circuit, to avoid AC power
Voltage jump causes damage to the resonant element of dynamic action.Detecting after surge occurs in AC power, in correlation technique
Voltage surge protection circuit can trigger the PPG control modules of main control unit so that main control unit stops output PPG pulses letter
Number.But, the protection mechanism in correlation technique has the drawback that, in switching tube service time section (20us or so), if
Voltage surge is produced when switching tube has opened the long period, then due to storing part energy and voltage surge on coil panel
The busbar voltage of the resonant element caused is elevated, even if now stopping output PPG pulse signals to switching tube, resonant element is still
Resonant operational can be so carried out, causes the colelctor electrode of switching tube to bear higher voltage (such as up to 1.5KV voltages), even more than
The pressure voltage of switching tube, causes switching tube punch through damage.
Therefore, correlation technique needs to be improved.
Utility model content
The utility model is intended at least solve one of technical problem in above-mentioned technology to a certain extent.Therefore, this reality
It is to propose a kind of switching tube protection circuit of electromagnetic heater with first new purpose, the protection circuit is defeated in stopping
The voltage that switching tube is born is reduced by changing the resonant parameter of resonance circuit while going out control signal to switching tube, is carried
The Surge handling capability and whole aircraft reliability of high circuit.
Second purpose of the present utility model is to propose a kind of electromagnetic heater.
To reach above-mentioned purpose, a kind of switch protection of pipe electricity for electromagnetic heater that on the one hand the utility model proposes
Road, including：Voltage surge detection unit, the voltage surge detection unit is connected with AC power, the voltage surge detection
Unit detects signal by detecting the surge voltage of the AC power to generate surge；Gate-controlled switch, the gate-controlled switch is used
To control the resonant parameter of resonance circuit in the electromagnetic heater to be changed；Main control unit, the guarantor of the main control unit
Shield end is connected with the output end that the voltage surge is detected, the control signal output of the main control unit and the gate pole of switching tube
Be connected, the switch control output end of the main control unit is connected with the control end of the gate-controlled switch, the main control unit according to
The surge detection signal judges to stop outputing control signals to the switching tube when surge voltage occurs in the AC power, and
By controlling the gate-controlled switch to change the resonant parameter of resonance circuit, to reduce the voltage that the switching tube is born.
According to the utility model proposes electromagnetic heater, pass through voltage surge detection unit detect AC power wave
Voltage is gushed to generate surge detection signal, and control unit is stopped when detecting that signal judges that surge voltage occurs in AC power according to surge
Switching tube is only output control signals to, while changing the resonant parameter of resonance circuit by controlling gate-controlled switch, is opened with reducing
The voltage that pipe is born is closed, occurs that resonance circuit action can be achieved once after surge in the voltage of AC power, and can drop
The magnitude of voltage that low switch pipe is born, switching tube punctures caused by preventing surge voltage, improves the Surge handling capability of circuit, is lifted whole
The reliability of machine.
Further, the voltage surge detection unit includes：First diode, the anode of first diode and institute
The first end for stating AC power is connected；Second diode, the anode of second diode and the second end of the AC power
It is connected, the negative electrode of second diode is connected to constitute first node with the negative electrode of first diode；First resistor,
Two resistance and 3rd resistor, one end of the first resistor are connected with the first node, the first resistor, second electricity
It is connected in series with each other between resistance and the 3rd resistor, there is Section Point between the second resistance and the 3rd resistor,
The 3rd resistor ground connection；First electric capacity, first electric capacity is connected in parallel with the first resistor；4th resistance, described
One end of four resistance is connected with the Section Point；Comparator, the positive input terminal of the comparator is another with the 4th resistance
One end is connected, and the negative input end connection reference voltage of the comparator provides end, and the output end of the comparator is used as the electricity
Press the output end of surge detection unit.
Preferably, first electric capacity can be ceramic disc capacitor.
Further, the voltage surge detection unit also includes：Second electric capacity, one end of second electric capacity with it is described
The positive input terminal of comparator is connected, the other end ground connection of second electric capacity.
Further, the resonance circuit includes：Resonance coil；First resonant capacitance, first resonant capacitance and institute
Resonance coil is stated to be connected in parallel；Second resonant capacitance, second resonant capacitance is connected in series rear and institute with the gate-controlled switch
The first resonant capacitance is stated to be connected in parallel.
Specifically, when the main control unit detects that signal judges that surge voltage occurs in the AC power according to the surge
The gate-controlled switch is controlled to close, second resonant capacitance participates in resonant operational.
Preferably, the switching tube can be IGBT.
To reach above-mentioned purpose, a kind of electromagnetic heater that on the other hand the utility model proposes, including described electricity
The switching tube protection circuit of magnetic heater.
Preferably, the electromagnetic heater can be electromagnetic oven, prevention electromagnetic pressure cooker or electromagnetic rice cooker.
According to the utility model proposes electromagnetic heater, pass through the switch protection of pipe of above-mentioned electromagnetic heater electricity
Road, occurs that resonance circuit action can be achieved once after surge, and can reduce switching tube and bear in the voltage of AC power
Magnitude of voltage, switching tube punctures caused by preventing surge voltage, improve circuit Surge handling capability, lifted complete machine reliability.
Brief description of the drawings
Fig. 1 is that the square frame of the switching tube protection circuit of the electromagnetic heater according to the utility model one embodiment is illustrated
Figure；
Fig. 2 is the circuit theory of the switching tube protection circuit of the electromagnetic heater according to the utility model one embodiment
Figure；And
Fig. 3 is the block diagram of the electromagnetic heater according to the utility model one embodiment.
Reference：
Voltage surge detection unit 10, gate-controlled switch 20 and main control unit 30；
Resonance circuit 40, switching tube 50, AC power 60 and power supply unit 70；
First diode D1, the second diode D2, first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity
C1, the 4th resistance R4, comparator U1 and the second electric capacity C2；
Resonance coil L40, the first resonant capacitance C3 and the second resonant capacitance C4；
Rectification module 701, filtration module 702 and sampling resistor R0；
Filter inductance L0, the first filter capacitor C5 and the second filter capacitor C6.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
With reference to the accompanying drawings come describe according to the utility model embodiment propose electromagnetic heater switch protection of pipe
Circuit and electromagnetic heater.
Fig. 1 is that the square frame of the switching tube protection circuit of the electromagnetic heater according to the utility model one embodiment is illustrated
Figure.As shown in figure 1, the switching tube protection circuit of the electromagnetic heater includes：Voltage surge detection unit 10, gate-controlled switch 20
With main control unit 30.
Wherein, voltage surge detection unit 10 is connected with AC power 60, and voltage surge detection unit 10 is handed over by detecting
The surge voltage of power supply 60 is flowed to generate surge detection signal；Gate-controlled switch 20 is to control resonance circuit in electromagnetic heater
40 resonant parameter is changed；The protection end of main control unit 30 is connected with the output end of voltage surge detection unit 10, master control
The control signal output of unit 30 is connected with the gate pole G of switching tube 50, the switch control output end of main control unit 30 with it is controllable
The control end of switch 20 is connected, and main control unit 30 stops when detecting that signal judges that surge voltage occurs in AC power 60 according to surge
Switching tube 50 is output control signals to, and by controlling gate-controlled switch 20 to change the resonant parameter of resonance circuit 40, to reduce
The voltage that switching tube 50 is born.
Specifically, the resonant parameter such as resonant capacitance value of resonance circuit 40 can be adjusted for gate-controlled switch 20.
In electromagnetic heater normal work, voltage surge detection unit 10 does not generate surge detection signal, and voltage surge detection is single
The output signal of member 10 is low level, and main control unit 30 judges that AC power 60 does not occur surge voltage, and main control unit 30 is exported
Control signal is to switching tube 50, with being switched on or off for controlling switch pipe 60, meanwhile, at the control gate-controlled switch 20 of main control unit 30
In off-state, so that the resonant parameter of resonance circuit 40 keeps the first resonant capacitance value；When the alternating current of electromagnetic heater
Source 60 occur abrupt transients when, voltage surge detection unit 10 generation surge detection signal, voltage surge detection unit 10 it is defeated
It is high level to go out signal from low transition, and main control unit 30 judges that surge voltage occurs in AC power 60, and main control unit 30 stops
Switching tube 50 is only output control signals to, so that switching tube 50 is stopped, meanwhile, the control gate-controlled switch 20 of main control unit 30 is closed
Close, the resonant parameter of resonance circuit 40 is adjusted to the second resonant capacitance value, wherein, it is humorous that the second resonant capacitance value is more than first
Shake capacitance, according to the resonance characteristic of lc circuit, when the resonant capacitance value increase of resonance circuit 40, switching tube 50 can be reduced
The voltage born, to play a part of protection switch pipe 50.
Thus, switching tube protection circuit of the present utility model is after surge detection signal is detected, and control unit stops
Switching tube is output control signals to, while gate-controlled switch is controlled to change the resonant parameter of resonance circuit, so that, in AC power
Voltage occur that resonance circuit action can be achieved once after surge, and the magnitude of voltage that switching tube is born can be reduced, prevented
Switching tube punctures caused by surge voltage, improves the Surge handling capability of circuit, lifts the reliability of complete machine.
According to one embodiment of the present utility model, as shown in Fig. 2 voltage surge detection unit 10 includes：One or two pole
Pipe D1, the second diode D2, first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1, the 4th resistance R4 and ratio
Compared with device U1.
Wherein, the first diode D1 anode is connected with the first end ACL of AC power 60；Second diode D2 anode
It is connected with the second end ACN of AC power 60, the second diode D2 negative electrode is connected to constitute with the first diode D1 negative electrode
First node；First resistor R1 one end is connected with first node, between first resistor R1, second resistance R2 and 3rd resistor R3
It is connected in series with each other, there is Section Point, 3rd resistor R3 ground connection between second resistance R2 and 3rd resistor R3；First electric capacity C1
It is connected in parallel with first resistor R1；4th resistance R4 one end is connected with Section Point；Comparator U1 positive input terminal and the 4th
The resistance R4 other end is connected, and comparator U1 negative input end connection reference voltage provides end, comparator U1 output end conduct
The output end of voltage surge detection unit 10.
According to a specific embodiment of the present utility model, the first electric capacity C1 is ceramic disc capacitor.Wherein, ceramic disc capacitor is at it
Short circuit occurs during the voltage jump at two ends.
According to one embodiment of the present utility model, as shown in Fig. 2 voltage surge detection unit 10 also includes：Second electricity
Hold C2, the second electric capacity C2 one end is connected with comparator U1 positive input terminal, the second electric capacity C2 other end ground connection.
Specifically, in the course of work of electromagnetic heater, voltage surge detection unit 10 is carried to AC power 60
The electric main of confession carries out rectification and sampling, wherein, what the first diode D1 and the second diode D2 provided AC power 60
Electric main rectification is DC voltage Vdc, and first resistor R1, second resistance R2 and 3rd resistor R3 are to the direct current after rectification processing
Voltage carries out resistive-capacitive voltage divider, and the 4th resistance R4 and the second electric capacity C2 are the voltage at 3rd resistor R3 two ends to sampled point A voltage
Handled, and the sampled voltage after processing is exported to comparator U1 positive input terminal.Due to comparator U1 negative input end
The reference voltage received is fixed value, it is assumed that the magnitude of voltage of reference voltage is Vref, in electromagnetic heater normal work,
The magnitude of voltage V1=Vdc*R3/ (R1+R2+R3) of sampled voltage, now, the magnitude of voltage V1 of sampled voltage are less than the electricity of reference voltage
Pressure value Vref, comparator U1 output low level；When the electric main abrupt transients that AC power 60 is provided, first resistor R1 two
Short circuit occurs for the voltage instantaneous mutation at end, the first electric capacity C1, and sampled point A voltage instantaneous is elevated, the magnitude of voltage of sampled voltage
V2=Vdc*R3/ (R2+R3), now, the magnitude of voltage V1 of sampled voltage are higher than the magnitude of voltage Vref of reference voltage, and comparator U1 is defeated
Go out high level.So, when comparator U1 output switching activity signals, triggering surge detection signal, and surge is detected into signal output
To main control unit 30.
It should be noted that first resistor R1, second resistance R2 and 3rd resistor R3 resistive-capacitive voltage divider ratio, and the 4th
Resistance R4 and the second electric capacity C2 parameter selection, influence the voltage surge protection sensitivity of voltage surge detection unit 10.
According to one embodiment of the present utility model, as shown in Fig. 2 resonance circuit 40 includes：Resonance coil L40, first
Resonant capacitance C3 and the second resonant capacitance C4, the first resonant capacitance C3 and resonance coil L40 are connected in parallel；Second resonant capacitance C4
It is connected in parallel after being connected in series with gate-controlled switch 20 with the first resonant capacitance C3.Resonant element 40 is used for the control in switching tube 50
Under convert electrical energy into electromagnetic energy, so as to carry out resonance heating.
Specifically, resonance circuit 40 is the resonance circuit of extension, wherein, resonance circuit 40 is in original LC parallel resonances
On the basis of structure, resonant capacitance is handled.In electromagnetic heater normal work, gate-controlled switch 20, which is in, to be disconnected
State, now, the first resonant capacitance C3 participate individually in resonant operational, and the resonant parameter of resonance circuit 40 keeps the first resonant capacitance
Value c3；When abrupt transients occur for the AC power 60 of electromagnetic heater, gate-controlled switch 20 is in closure, now, in parallel
First resonant capacitance C3 and the second resonant capacitance C4 participates in resonant operational, and the resonant parameter of resonance circuit 40 is adjusted to the second resonance
Capacitance c3+c4.
According to a specific embodiment of the present utility model, as shown in Fig. 2 switching tube 50 can be IGBT (Insulated
Gate Bipolar Transistor, insulated gate bipolar transistor).Wherein, the gate pole G of switching tube 50 and main control unit 30
Control signal output be connected, the colelctor electrode C of switching tube 50 and the one of the first resonant capacitance C3 in parallel and resonance coil L40
End is connected, the emitter E ground connection of switching tube 50.
According to one embodiment of the present utility model, as illustrated in fig. 1 and 2, the protection circuit of electromagnetic heater also includes：
Power supply unit 70, wherein, power supply unit 70 is used to carry out rectification and filtering process to the electric main that AC power 60 is provided, with
Galvanic current is provided for electromagnetic heater.
Wherein, power supply unit 70 include rectification module 701 and filtration module 702, the first input end of rectification module 701 with
The first end ACL of AC power 60 is connected, and the second input of rectification module 701 is connected with the second end ACN of AC power 60；
Filtration module 702 includes filter inductance L0, the first filter capacitor C5 and the second filter capacitor C6, wherein, the one of filter inductance L0
End is connected with the first output end of rectification module 701, between filter inductance L0 one end and the first output end of rectification module 701
With the 3rd node, the filter inductance L0 other end and the first resonant capacitance C3 in parallel and resonance coil L40 other end phase
Even, have the 4th between the filter inductance L0 other end and the first resonant capacitance C3 in parallel and the resonance coil L40 other end
Node；First filter capacitor C5 one end is connected with the 3rd node, the first filter capacitor C5 other end and rectification module 701
Second output end is connected, and has Section five between the first filter capacitor C5 other end and the second output end of rectification module 701
Point；Second filter capacitor C6 one end is connected with fourth node, and the second filter capacitor C6 other end is connected with the 5th node.
Specifically, filter inductance L0, the first filter capacitor C5 and the second filter capacitor C6 constitute pi type filter, the π types
Wave filter has the effect of electromagnetic compatibility, wherein, the second filter capacitor C6 also serves as energy-storage travelling wave tube, and power supply unit 70 participates in resonance
Process, and provide energy for electromagnetic heater.
According to one embodiment of the present utility model, as illustrated in fig. 1 and 2, the protection circuit of electromagnetic heater also includes：
Sampling resistor R0, wherein, sampling resistor R0 one end is connected with the 5th node, sampling resistor R0 other end ground connection.
According to one embodiment of the present utility model, main control unit 30 detects that signal judges that AC power 60 goes out according to surge
Control gate-controlled switch 20 is closed during existing surge voltage, and the second resonant capacitance C4 participates in resonant operational.
According to a specific embodiment of the present utility model, gate-controlled switch 20 can for relay or other there is electric-controlled switch
The component of characteristic.
Specifically, the output signal of the real-time monitoring voltage surge detection unit 10 of main control unit 30, when voltage surge inspection
When the output signal for surveying unit 10 is low level, main control unit 30 does not receive surge detection signal, and judges AC power 60
Do not occur surge voltage, main control unit 30 outputs control signals to switching tube 50, with being switched on or off for controlling switch pipe 60, together
When, the control gate-controlled switch 20 of main control unit 30 is off, so that the resonant parameter of resonance circuit 40 keeps the first resonance
Capacitance c3.When it is high level for example from low transition that the output signal of voltage surge detection unit 10, which is energizing signal,
Main control unit 30 receives surge detection signal, and judges that surge voltage occurs in AC power 60, and surge detection signal can be touched
Send out main control unit 30 and perform two actions, the PPG control modules of one side main control unit 30 stop outputing control signals to switch
Pipe 50, switching tube 50 is stopped, and when the time that switching tube 50 is stopped reaching preset time, main control unit 30 is again defeated
Go out control signal to switching tube 50, so that electromagnetic heater restarts work；On the other hand, main control unit 50 controls controllable
Switch 20, is adjusted to closure state, the second resonant capacitance C4 participates in resonant operational by gate-controlled switch 20 by off-state, will
The resonant parameter of resonance circuit 40 is adjusted to the second resonant capacitance value c3+c4, and the resonant capacitance value of resonance circuit 40 becomes big, works as electricity
When magnetic heater carries out resonance heating, due to resonant capacitance increase, the voltage that switching tube 50 is born can be reduced, to play
The effect of protection switch pipe 50.
To sum up, the electromagnetic heater proposed according to the utility model embodiment, is detected by voltage surge detection unit
The surge voltage of AC power is to generate surge detection signal, and control unit detects that signal judges that AC power occurs according to surge
Stop outputing control signals to switching tube during surge voltage, while changing the resonance ginseng of resonance circuit by controlling gate-controlled switch
Number, to reduce the voltage that switching tube is born, occurs that resonance circuit action can be achieved once after surge in the voltage of AC power,
And the magnitude of voltage that switching tube is born can be reduced, switching tube punctures caused by preventing surge voltage, improve the antisurge of circuit
Ability, lifts the reliability of complete machine.
Fig. 3 is the block diagram of the electromagnetic heater according to the utility model embodiment.As shown in figure 3, the electromagnetism
Heater 100 includes the switching tube protection circuit 200 of electromagnetic heater.
According to a specific embodiment of the present utility model, electromagnetic heater 100 can for electromagnetic oven, prevention electromagnetic pressure cooker or
Electromagnetic rice cooker.
To sum up, the electromagnetic heater proposed according to the utility model embodiment, passes through opening for above-mentioned electromagnetic heater
Tube protective circuit is closed, occurs that resonance circuit action can be achieved once after surge in the voltage of AC power, and can reduce
The magnitude of voltage that switching tube is born, switching tube punctures caused by preventing surge voltage, improves the Surge handling capability of circuit, lifts complete machine
Reliability.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " suitable
The orientation or position relationship of the instruction such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on orientation shown in the drawings
Or position relationship, be for only for ease of description the utility model and simplify and describe, rather than indicate or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
It is individual, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the common skill of this area
For art personnel, concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature
Can be that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered
Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (9)
1. a kind of switching tube protection circuit of electromagnetic heater, it is characterised in that including：
Voltage surge detection unit, the voltage surge detection unit is connected with AC power, the voltage surge detection unit
By detecting the surge voltage of the AC power signal is detected to generate surge；
Gate-controlled switch, the gate-controlled switch is to control the resonant parameter of resonance circuit in the electromagnetic heater to be become
Change；
Main control unit, the output end that the protection end of the main control unit is detected with the voltage surge is connected, the main control unit
Control signal output be connected with the gate pole of switching tube, the switch control output end of the main control unit and the gate-controlled switch
Control end be connected, the main control unit according to the surge detect signal judge that surge voltage occurs in the AC power when stop
The switching tube is only output control signals to, and by controlling the gate-controlled switch to change the resonant parameter of resonance circuit, with
Reduce the voltage that the switching tube is born.
2. the switching tube protection circuit of electromagnetic heater as claimed in claim 1, it is characterised in that the voltage surge inspection
Surveying unit includes：
First diode, the anode of first diode is connected with the first end of the AC power；
Second diode, the anode of second diode is connected with the second end of the AC power, second diode
Negative electrode be connected with the negative electrode of first diode to constitute first node；
First resistor, second resistance and 3rd resistor, one end of the first resistor are connected with the first node, and described first
Be connected in series with each other between resistance, the second resistance and the 3rd resistor, the second resistance and the 3rd resistor it
Between there is Section Point, 3rd resistor ground connection；
First electric capacity, first electric capacity is connected in parallel with the first resistor；
4th resistance, one end of the 4th resistance is connected with the Section Point；
Comparator, the positive input terminal of the comparator is connected with the other end of the 4th resistance, the negative input of the comparator
End connection reference voltage provides end, the output end of the comparator as the voltage surge detection unit output end.
3. the switching tube protection circuit of electromagnetic heater as claimed in claim 2, it is characterised in that first electric capacity is
Ceramic disc capacitor.
4. the switching tube protection circuit of electromagnetic heater as claimed in claim 2, it is characterised in that the voltage surge inspection
Surveying unit also includes：
Second electric capacity, one end of second electric capacity is connected with the positive input terminal of the comparator, second electric capacity it is another
End ground connection.
5. the switching tube protection circuit of the electromagnetic heater as any one of claim 1-4, it is characterised in that described
Resonance circuit includes：
Resonance coil；
First resonant capacitance, first resonant capacitance is connected in parallel with the resonance coil；
Second resonant capacitance, second resonant capacitance is connected in series rear and first resonant capacitance simultaneously with the gate-controlled switch
Connection connection.
6. the switching tube protection circuit of electromagnetic heater as claimed in claim 5, it is characterised in that the main control unit root
The gate-controlled switch is controlled to close when judging that surge voltage occurs in the AC power according to surge detection signal, described second
Resonant capacitance participates in resonant operational.
7. the switching tube protection circuit of electromagnetic heater as claimed in claim 1, it is characterised in that the switching tube is
IGBT。
8. a kind of electromagnetic heater, it is characterised in that including the electromagnetic heater as any one of claim 1-7
Switching tube protection circuit.
9. electromagnetic heater as claimed in claim 8, it is characterised in that the electromagnetic heater is electromagnetic oven, electromagnetism
Pressure cooker or electromagnetic rice cooker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621444111.2U CN206353871U (en) | 2016-12-26 | 2016-12-26 | The switching tube protection circuit and electromagnetic heater of electromagnetic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621444111.2U CN206353871U (en) | 2016-12-26 | 2016-12-26 | The switching tube protection circuit and electromagnetic heater of electromagnetic heater |
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| Publication Number | Publication Date |
|---|---|
| CN206353871U true CN206353871U (en) | 2017-07-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621444111.2U Active CN206353871U (en) | 2016-12-26 | 2016-12-26 | The switching tube protection circuit and electromagnetic heater of electromagnetic heater |
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| CN110225608A (en) * | 2018-03-01 | 2019-09-10 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its starting control device of power switch tube, method |
| CN110289764A (en) * | 2019-05-29 | 2019-09-27 | 中国国家铁路集团有限公司 | Power conversion device |
| CN110972344A (en) * | 2019-09-16 | 2020-04-07 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating circuit, electromagnetic heating appliance and protection method of electromagnetic heating circuit |
| CN111385924A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and control method and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110225608A (en) * | 2018-03-01 | 2019-09-10 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its starting control device of power switch tube, method |
| CN111385924A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and control method and device thereof |
| CN110289764A (en) * | 2019-05-29 | 2019-09-27 | 中国国家铁路集团有限公司 | Power conversion device |
| CN110972344A (en) * | 2019-09-16 | 2020-04-07 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating circuit, electromagnetic heating appliance and protection method of electromagnetic heating circuit |
| CN112564486A (en) * | 2019-09-26 | 2021-03-26 | 海信视像科技股份有限公司 | Display device |
| CN112564486B (en) * | 2019-09-26 | 2022-04-22 | 海信视像科技股份有限公司 | Display device |
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