CN207783190U - Electromagnetic heating system and its heating control apparatus - Google Patents
Electromagnetic heating system and its heating control apparatus Download PDFInfo
- Publication number
- CN207783190U CN207783190U CN201721374567.0U CN201721374567U CN207783190U CN 207783190 U CN207783190 U CN 207783190U CN 201721374567 U CN201721374567 U CN 201721374567U CN 207783190 U CN207783190 U CN 207783190U
- Authority
- CN
- China
- Prior art keywords
- circuit
- heating system
- electromagnetic heating
- control
- capacitance
- Prior art date
- 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.)
- Active
Links
Landscapes
- General Induction Heating (AREA)
Abstract
The utility model discloses a kind of electromagnetic heating system and its heating control apparatus, wherein heating control apparatus includes：Resonance circuit；Power supply circuit；Power switch tube carries out resonant operational to control resonance circuit；Sync detection circuit, by detecting the resonance potential at resonance circuit both ends to generate synchronous detection signal；Correct circuit；Control circuit, it is connected respectively with power switch tube, sync detection circuit and amendment circuit, control circuit generates control signal to control the on or off of power switch tube according to synchronous detection signal, and control amendment circuit is modified the parameter of sync detection circuit when electromagnetic heating system is in low-voltage high-power state.Thus, the device can be modified the parameter of sync detection circuit when electromagnetic heating system is in low-voltage high-power state, phenomenon is connected in lag to slow down power switch tube, avoids power switch tube from temperature occur and rises exceeded phenomenon, improves the reliability of electromagnetic heating system.
Description
Technical field
The utility model is related to technical field of electric appliances, more particularly to the heating control apparatus and one of a kind of electromagnetic heating system
Kind electromagnetic heating system.
Background technology
With the stabilization of IH (Indirect Heating, indirectly heat) heating technique, carried out using electromagnetic heating system
Electric appliance (for example, electromagnetic oven) popularity rate of heating work is higher and higher.
Electromagnetic oven is the reliability for ensureing heating, and general heated current control is in 6A or so.However, in some places,
The supply voltage of power grid is unstable, for example, Yunnan, Guizhou etc. ground, generally small power station generate electricity, load capacity is smaller, with
When electric peak, it is relatively low to may result in supply voltage, even lower than 150V.
When the supply voltage of power grid is 150V, the heating power of electromagnetic oven is about 900W, and heating effect is bad.If this
Shi Tigao heating powers can then lead to power switch tube such as IGBT (the Insulated Gate in electromagnetic heating system
Bipolar Transistor, insulated gate bipolar transistor) lag conducting it is serious, it is exceeded to which IGBT temperature can be caused to rise,
It is easily damaged IGBT, influences the reliability of electromagnetic oven work.But if not improving heating power, the heating work(of 900W or so
The usage experience for seriously affecting user of rate.
Utility model content
The application is made to the understanding of problems with and research based on inventor：
Fig. 1 is the circuit topology figure of electromagnetic heating system in the related technology.As shown in Figure 1, electromagnetic heating system generally wraps
It includes：Protective tube F1, rectifier bridge D1, choke coil L1, resonance coil L, resonant capacitance C, filter capacitor Cr, IGBT and synchronous detection electricity
Road, main control chip IC1, driving unit U3 and other circuit module U2.Wherein, sync detection circuit may include：First to
Three resistance R1-R3, the first capacitance C1 and the second capacitance C2.L represents firewire, and N represents zero curve.
Main control chip IC1 includes comparing unit CMP, and the failing edge of the comparison signal of comparing unit CMP outputs triggers master control
Chip IC 1 sends out PPG (Programme Pulse Generator, PPG programme pulse generator) controls pulse, and (voltage magnitude is about
5V) PPG control pulses are converted to IGBT driving pulses (voltage magnitude is about 18V) to driving unit U3, driving unit U3, with
Drive the conducting of IGBT.Wherein, PPG controls arteries and veins and rushes target power of the width by main control chip IC1 according to electromagnetic heating system
Control.In the case of normal output, in resonance potential zero crossing, main control chip IC1 believes according to the comparison that comparing unit CMP is exported
Number send out PPG pulse signals so that IGBT is connected.In the case of normal voltage, the driving pulse and resonance potential relationship of IGBT are such as
Shown in Fig. 2.
And (input voltage is generally less than 180V and input when electromagnetic heating system is operated in low-voltage high-power state
Electric current is more than 6A, it is believed that is low-voltage high-power state), due to Circuit Parameter's Influence, as shown in figure 3, comparing unit can be caused
The failing edge lag of the comparison signal of CMP outputs, IGBT lag the t times after resonance potential zero crossing and are just connected, this can cause
IGBT temperature liter is exceeded, is easy to burn IGBT, influences the reliability of electromagnetic heating system work.
The utility model is intended to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, this reality
It is to propose that a kind of heating control apparatus of electromagnetic heating system, the device can slow down power switch with a novel purpose
Phenomenon is connected in the lag of pipe, avoids power switch tube from temperature occur and rises exceeded phenomenon, improves the reliability of electromagnetic heating system.
Another purpose of the utility model is to propose a kind of electromagnetic heating system.
In order to achieve the above objectives, the utility model first aspect proposes a kind of heating control apparatus of electromagnetic heating system
Including：Resonance circuit；Power supply circuit, the power supply circuit are connected with the resonance circuit to provide resonance to the resonance circuit
Energy；Power switch tube, the power switch tube carry out resonant operational to control the resonance circuit；Sync detection circuit,
The sync detection circuit is by detecting the resonance potential at the resonance circuit both ends to generate synchronous detection signal；Correct electricity
Road, the amendment circuit are connected with the sync detection circuit；Control circuit, the control circuit respectively with the power switch
Pipe, the sync detection circuit are connected with the amendment circuit, and the control circuit is generated according to the synchronous detection signal and controlled
Signal processed is in low-voltage high-power shape to control the on or off of the power switch tube in the electromagnetic heating system
It controls the amendment circuit when state to be modified the parameter of the sync detection circuit, to slow down the stagnant of the power switch tube
After phenomenon is connected.
The heating control apparatus of electromagnetic heating system according to the present utility model controls resonance circuit by power switch tube
Resonant operational is carried out, sync detection circuit generates synchronous detection signal, control by detecting the resonance potential at resonance circuit both ends
Circuit generates control signal to control the on or off of power switch tube, and in electromagnetic heating system according to synchronous detection signal
Control is corrected circuit and is modified to the parameter of sync detection circuit when in low-voltage high-power state, to slow down power switch
Phenomenon is connected in the lag of pipe.The device can be examined when electromagnetic heating system is in low-voltage high-power state to synchronous as a result,
The parameter of slowdown monitoring circuit is modified, and phenomenon is connected in the lag to slow down power switch tube, and power switch tube is avoided Wen Shengchao occur
Target phenomenon improves the reliability of electromagnetic heating system.
In addition, can also be had according to the heating control apparatus of the utility model electromagnetic heating system set forth above as follows
Additional technical characteristic：
Specifically, the sync detection circuit includes：First resistor, one end of the first resistor and the resonance circuit
First end be connected；Second resistance, one end of the second resistance are connected with the other end of the first resistor and have first
Node, the second resistance the other end ground connection, the first node as the sync detection circuit the first output end with
First synchronous detection signal receiving terminal of the control circuit is connected；First capacitance, first capacitance and the second resistance
It is in parallel；3rd resistor, one end of the 3rd resistor are connected with the second end of the resonance circuit；4th resistance, the described 4th
One end of resistance is connected with the other end of the 3rd resistor and there is second node, the other end of the 4th resistance to be grounded,
The second node is as the second output terminal of the sync detection circuit and the second synchronous detection signal of the control circuit
Receiving terminal is connected.
Specifically, the amendment circuit includes：5th resistance, one end and the second node phase of the 5th resistance
Even, the other end of the 5th resistance is connected with the revise signal output end of the control circuit.
Further, the control circuit passes through described when the electromagnetic heating system is in low-voltage high-power state
Revise signal output end exports low level signal, so that the 5th resistance and the 4th resistor coupled in parallel, the 5th resistance
Access the sync detection circuit.
Specifically, the sync detection circuit further includes the second capacitance, and the amendment circuit includes third capacitance, wherein
One end of second capacitance is connected with the second node, the other end of one end of the third capacitance and second capacitance
It is connected and there is third node, the other end of the third capacitance is grounded after being connected with the other end of the 4th resistance, described
Third node is connected with the revise signal output end of the control circuit.
Further, the control circuit passes through described when the electromagnetic heating system is in low-voltage high-power state
Revise signal output end exports high-impedance state signal, so that electric with the described 4th after second capacitance and third capacitance series connection
Resistance is in parallel, and the third capacitance accesses the sync detection circuit.
Specifically, the control circuit includes main control chip and driving unit, and the main control chip includes comparing unit, institute
The positive input terminal for stating comparing unit is connected with the second node, the negative input end of the comparing unit and the first node phase
Even, the main control chip sends out PPG by the comparison signal that the comparing unit exports and controls pulse to the driving unit, with
The on or off of the power switch tube is driven by the driving unit.
Specifically, the power switch tube is IGBT.
Specifically, the resonant element includes resonance coil and resonant capacitance, and the resonance coil and resonant capacitance are in parallel.
In order to achieve the above objectives, on the other hand the utility model proposes a kind of electromagnetic heating system, including above-mentioned electricity
The heating control apparatus of magnetic heating system.
The electromagnetic heating system of the utility model, can be when in low-voltage high-power state to sync detection circuit
Parameter is modified, and phenomenon is connected in the lag to slow down power switch tube, is avoided power switch tube from temperature occur and is risen exceeded phenomenon,
Improve the reliability of work.
Description of the drawings
The utility model is above-mentioned and/or additional aspect and advantage from the following description of the accompanying drawings of embodiments will
Become apparent and be readily appreciated that, wherein
Fig. 1 is the circuit topology figure of electromagnetic heating system in the related technology；
Fig. 2 is resonance potential, the drive pulse waveform relational graph of comparison signal, IGBT in the case of normal voltage；
Fig. 3 is low-voltage high-power state resonance potential and the drive pulse waveform relational graph of IGBT；
Fig. 4 is illustrated according to the box of the heating control apparatus of the electromagnetic heating system of the utility model one embodiment
Figure；And
Fig. 5 a- Fig. 5 b are the circuits according to the heating control apparatus of the electromagnetic heating system of the utility model one embodiment
Topological diagram.
Specific implementation mode
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
Below in conjunction with the accompanying drawings come describe the utility model embodiment electromagnetic heating system heating control apparatus and electromagnetism
Heating system.
Fig. 4 is illustrated according to the box of the heating control apparatus of the electromagnetic heating system of the utility model one embodiment
Figure.As shown in figure 4, the device includes：Resonance circuit 10, power switch tube 30, sync detection circuit 40, is repaiied power supply circuit 20
Positive circuit 50 and control circuit 60.
Wherein, power supply circuit 20 is connected with resonance circuit 10 to provide resonant energy to resonance circuit 20.Power switch tube
30 carry out resonant operational to control resonance circuit 10.Sync detection circuit 40 is electric by the resonance for detecting 10 both ends of resonance circuit
Pressure is to generate synchronous detection signal.Circuit 50 is corrected with sync detection circuit 40 to be connected.Control circuit 60 respectively with power switch
Pipe 30, sync detection circuit 40 with correct circuit 50 be connected, control circuit 60 according to synchronous detection signal generate control signal with
The on or off of power switch tube 30 is controlled, and electricity is corrected in control when electromagnetic heating system is in low-voltage high-power state
Road 50 is modified the parameter of sync detection circuit 40, and phenomenon is connected in the lag to slow down power switch tube 30.
Specifically, as shown in figure 4, when electromagnetic heating system just starts to start heating work, the output inspection of control circuit 60
Pot pulse makes resonance circuit 10 work to power switch tube 30 as starting of oscillation signal.It is operated in just in electromagnetic heating system
When under normal voltage condition, sync detection circuit 40 generates synchronous detection letter by detecting the resonance potential at 10 both ends of resonance circuit
Number, control circuit 60 generates corresponding control signal according to synchronous detection signal, to control power switch tube 40 in resonance potential
It is connected at zero crossing.
And when electromagnetic heating system is operated in low-voltage high-power state, control circuit 60 by correct circuit 50 into
Row control, is modified the parameter of sync detection circuit 40, the failing edge of synchronizing signal is made to overturn in advance, to make to slow down work(
Phenomenon is connected in the lag of rate switching tube.Thus, it is possible to avoid the power when electromagnetic heating system is in low-voltage high-power state
There is temperature and rises exceeded phenomenon in switching tube, improves the reliability of electromagnetic heating system.
In the embodiments of the present invention, power switch tube 30 can be IGBT.
One embodiment according to the present utility model, as shown in Fig. 5 a-5b, sync detection circuit 40 may include：First
Resistance R1, second resistance R2, the first capacitance C1,3rd resistor R3 and the 4th resistance R4.
Wherein, as shown in Fig. 5 a-5b, one end of first resistor R1 is connected with the first end of resonance circuit 10.Second resistance
One end of R2 is connected with the other end of first resistor R1 and there is first node 1, the other end of second resistance R2 to be grounded, first segment
Point 1 is connected as the first output end of sync detection circuit 40 with the first synchronous detection signal receiving terminal of control circuit 60.The
One capacitance C1 is in parallel with second resistance R2.One end of 3rd resistor R3 is connected with the second end of resonance circuit 10.4th resistance R4
One end be connected with the other end of 3rd resistor R3 and there is second node 2, the other end of the 4th resistance R4 to be grounded, second node
2 are connected as the second output terminal of sync detection circuit 40 with the second synchronous detection signal receiving terminal of control circuit 60.
Further, one embodiment according to the present utility model, the control circuit 60 as shown in Fig. 5 a-5b include master control core
Piece IC1 and driving unit U3, main control chip IC1 include comparing unit CMP, the positive input terminal+and second node of comparing unit CMP
2 are connected, and the negative input end-of comparing unit CMP is connected with first node 1, and main control chip IC1 is exported by comparing unit CMP
Comparison signal sends out PPG and controls pulse to driving unit U3, with by the conducting of driving unit U3 driving powers switching tube 40 or
Shutdown.
Specifically, in the case of normal voltage, as shown in Fig. 2, the variation of resonance potential can make the ratio that comparing unit CMP is exported
It is converted compared with signal, main control chip IC1 sends out PPG according to comparison signal and controls pulse to driving unit U3, to control IGBT
It is connected at resonance potential zero crossing.
Resonant element 10 includes resonance coil L and resonant capacitance Cr, resonance coil L and resonant capacitance Cr in parallel.
Specifically, as shown in Fig. 5 a-5b, power supply circuit 10 may include protective tube F1, rectifier bridge D1 and choke coil L1, whole
An input terminal of stream bridge D1 is connected to the firewire L of AC power by protective tube F1, and another input terminal of rectifier bridge D1 connects
It is connected to the zero curve N of AC power, an output end of rectifier bridge D1 is connected to resonant element 10 by choke coil L1, another is defeated
Outlet is grounded, and resonant energy is provided so that AC rectification is supplied electricity to resonant element 10 as pulsating direct current by choke coil L1.Chokes
Circle L1 can effectively inhibit common mode interference signal (thunderous electrical interference).As shown in Fig. 5 a-5b, the electromagnetism of the utility model embodiment
The heating control apparatus of heating system can also include filter capacitor Cr, to be filtered to Rectified alternating current.
The magnetic field that will produce alternation when resonant element 10 works, if there is a magnetic conductive metal face is positioned over resonance coil
When above L, metal covering will induced current at this time.Because having resistance on metal covering, therefore the electric current incuded will make metal covering
Thermal energy is generated, to be heated to food.
Describe how control circuit 60 in electromagnetic heating system is in low-voltage high-power with reference to specifically embodiment
Control is corrected circuit 50 and is modified to the parameter of sync detection circuit 40 when state, and the lag to slow down power switch tube 40 is led
Logical phenomenon.
As an example, as shown in Figure 5 a, correcting circuit 50 may include：5th resistance R5.The one of 5th resistance R5
End is connected with second node 2, and the other end of the 5th resistance R5 is connected with the revise signal output end P10 of control circuit 60.
Further, pass through revise signal when electromagnetic heating system is in low-voltage high-power state when control circuit 60
Output end P10 exports low level signal, so that the 5th resistance R5 is in parallel with the 4th resistance R4, the synchronous detection of the 5th resistance R5 accesses
Circuit 40.
Specifically, in the case where electromagnetic heating system is in non-low-pressure high-power state, i.e., in the case of normal voltage when, control electricity
Road 60 controls revise signal output end P10 and exports high-impedance state signal, and P10 is equivalent to open circuit, and pull down resistor value is at second node 2
R4.And when electromagnetic heating system is in low-pressure high-power state, it is low that control circuit 60 controls the P10 outputs of revise signal output end
Level signal keeps the 5th resistance R5 in parallel with the 4th resistance R4, and pull down resistor value is (R4*R5)/(R4+R5) at second node 2,
And (R4*R5)/(R4+R5) is less than R4, at this time since the drop-down resistance value of second node 2 is small, voltage declines soon, leads to comparison signal
Failing edge overturning shift to an earlier date, to which the lag turn-on time t of power switch tube 40 can be made to reduce, it might even be possible to reduce to zero.By
This, temperature can occur to avoid power switch tube and rise exceeded phenomenon, improve the reliability of electromagnetic heating system.
As an example, as shown in Figure 5 b, sync detection circuit 40 can also include the second capacitance C2, correct circuit 50
May include third capacitance C3.Wherein, one end of the second capacitance C2 is connected with second node 2, one end of third capacitance C3 and the
The other end of two capacitance C2 is connected and has third node 3, the other end phase of the other end and the 4th resistance R4 of third capacitance C3
It is grounded after even, third node 3 is connected with the revise signal output end P10 of control circuit 60.
Further, control circuit 60 is defeated by revise signal when electromagnetic heating system is in low-voltage high-power state
Outlet P10 exports high-impedance state signal, so that, third electricity in parallel with the 4th resistance R4 after the second capacitance C2 and the C3 series connection of third capacitance
Hold C3 and accesses sync detection circuit 40.
Specifically, in the case where electromagnetic heating system is in non-low-pressure high-power state, i.e., in the case of normal voltage when, control electricity
Road 60 controls revise signal output end P10 and exports low level signal, and the capacitance at second node 23 is C2 at this time；.And in electricity
When magnetic heating system is in low-pressure high-power state, control circuit 60 controls revise signal output end P10 and exports high-impedance state signal,
P10 is equivalent to open circuit, the capacitance at second node 2 be C4*C5/ (C4+C5), and C4*C5/ (C4+C5) be less than C4, at this time by
Small in the capacitance of second node 2, voltage declines causes the failing edge overturning of comparison signal to shift to an earlier date soon, to power be made to hold
The lag turn-on time t for closing pipe 40 is reduced, it might even be possible to be reduced to zero.Thus, it is possible to which power switch tube is avoided Wen Shengchao occur
Target phenomenon improves the reliability of electromagnetic heating system.
It is appreciated that under normal circumstances, the general IGBT that is arranged is connected in advance, and it is zero that IGBT, which lags turn-on time t,.And to protect
The reliability for demonstrate,proving electromagnetic heating system, when low-voltage high-power state, IGBT lags turn-on time t and generally requires to be less than 2us.
In conclusion the heating control apparatus of electromagnetic heating system according to the present utility model, passes through power switch management and control
Resonance circuit processed carries out resonant operational, and sync detection circuit generates synchronous detection by detecting the resonance potential at resonance circuit both ends
Signal, control circuit generate control signal to control the on or off of power switch tube, and in electricity according to synchronous detection signal
Control is corrected circuit and is modified to the parameter of sync detection circuit when magnetic heating system is in low-voltage high-power state, to subtract
Phenomenon is connected in the lag of slow power switch tube.The device can be in low-voltage high-power state in electromagnetic heating system as a result,
When the parameter of sync detection circuit is modified, with slow down power switch tube lag be connected phenomenon, avoid power switch tube
There is temperature and rise exceeded phenomenon, improves the reliability of electromagnetic heating system.
In addition, the utility model embodiment also proposes a kind of electromagnetic heating system, including above-mentioned electromagnetic heating system
Heating control apparatus.
The electromagnetic heating system of the utility model, can be when in low-voltage high-power state to sync detection circuit
Parameter is modified, and phenomenon is connected in the lag to slow down power switch tube, is avoided power switch tube from temperature occur and is risen exceeded phenomenon,
Improve the reliability of work.
In the description of the present invention, it should be understood that term "center", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside",
The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on ... shown in the drawings
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated dress
It sets or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to the utility model
Limitation.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.The meaning of " plurality " is two or two in the description of the present invention,
More than, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be
Mechanical connection can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature is "above" or "below" second feature
Can be that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, first is special
Sign second feature " on ", " top " and " above " can be fisrt feature and be directly above or diagonally above the second feature, or only
Indicate that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is 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 specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combines and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (10)
1. a kind of heating control apparatus of electromagnetic heating system, which is characterized in that including：
Resonance circuit；
Power supply circuit, the power supply circuit are connected with the resonance circuit to provide resonant energy to the resonance circuit；
Power switch tube, the power switch tube carry out resonant operational to control the resonance circuit；
Sync detection circuit, the sync detection circuit is by detecting the resonance potential at the resonance circuit both ends to generate synchronization
Detect signal；
Circuit is corrected, the amendment circuit is connected with the sync detection circuit；
Control circuit, the control circuit respectively with the power switch tube, the sync detection circuit and the amendment circuit
Be connected, the control circuit according to the synchronous detection signal generate control signal with control the power switch tube conducting or
Shutdown, and the amendment circuit is controlled to the synchronous detection when the electromagnetic heating system is in low-voltage high-power state
The parameter of circuit is modified, and phenomenon is connected in the lag to slow down the power switch tube.
2. the heating control apparatus of electromagnetic heating system as described in claim 1, which is characterized in that the sync detection circuit
Including：
First resistor, one end of the first resistor are connected with the first end of the resonance circuit；
Second resistance, one end of the second resistance is connected with the other end of the first resistor and has first node, described
The other end of second resistance is grounded, first output end and control electricity of the first node as the sync detection circuit
The first synchronous detection signal receiving terminal on road is connected；
First capacitance, first capacitance are in parallel with the second resistance；
3rd resistor, one end of the 3rd resistor are connected with the second end of the resonance circuit；
One end of 4th resistance, the 4th resistance is connected with the other end of the 3rd resistor and has second node, described
The other end of 4th resistance is grounded, second output terminal and control electricity of the second node as the sync detection circuit
The second synchronous detection signal receiving terminal on road is connected.
3. the heating control apparatus of electromagnetic heating system as claimed in claim 2, which is characterized in that the amendment circuit packet
It includes：
One end of 5th resistance, the 5th resistance is connected with the second node, the other end of the 5th resistance with it is described
The revise signal output end of control circuit is connected.
4. the heating control apparatus of electromagnetic heating system as claimed in claim 3, which is characterized in that the control circuit is in institute
It states and low level signal is exported by the revise signal output end when electromagnetic heating system is in low-voltage high-power state, so that
5th resistance and the 4th resistor coupled in parallel, the 5th resistance access the sync detection circuit.
5. the heating control apparatus of electromagnetic heating system as claimed in claim 2, which is characterized in that the sync detection circuit
Further include the second capacitance, the amendment circuit includes third capacitance, wherein one end of second capacitance and the second node
It is connected, one end of the third capacitance is connected with the other end of second capacitance and has third node, the third capacitance
The other end be connected with the other end of the 4th resistance after be grounded, the revise signal of the third node and the control circuit
Output end is connected.
6. the heating control apparatus of electromagnetic heating system as claimed in claim 5, which is characterized in that the control circuit is in institute
It states and high-impedance state signal is exported by the revise signal output end when electromagnetic heating system is in low-voltage high-power state, so that
It is examined with the 4th resistor coupled in parallel, the third capacitance access synchronization after second capacitance and third capacitance series connection
Slowdown monitoring circuit.
7. the heating control apparatus of the electromagnetic heating system as described in any one of claim 2-6, which is characterized in that the control
Circuit processed includes main control chip and driving unit, and the main control chip includes comparing unit, the positive input terminal of the comparing unit
It is connected with the second node, the negative input end of the comparing unit is connected with the first node, and the main control chip passes through
The comparison signal of the comparing unit output sends out PPG and controls pulse to the driving unit, to be driven by the driving unit
Move the on or off of the power switch tube.
8. the heating control apparatus of electromagnetic heating system as described in claim 1, which is characterized in that the power switch tube is
IGBT。
9. the heating control apparatus of electromagnetic heating system as described in claim 1, which is characterized in that the resonant element includes
Resonance coil and resonant capacitance, the resonance coil and resonant capacitance are in parallel.
10. a kind of electromagnetic heating system, which is characterized in that including electromagnetic heating system as claimed in any one of claims 1-9 wherein
The heating control apparatus of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721374567.0U CN207783190U (en) | 2017-10-23 | 2017-10-23 | Electromagnetic heating system and its heating control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721374567.0U CN207783190U (en) | 2017-10-23 | 2017-10-23 | Electromagnetic heating system and its heating control apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207783190U true CN207783190U (en) | 2018-08-28 |
Family
ID=63218545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721374567.0U Active CN207783190U (en) | 2017-10-23 | 2017-10-23 | Electromagnetic heating system and its heating control apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207783190U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112839398A (en) * | 2019-11-25 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and dry burning detection method thereof |
| CN114390737A (en) * | 2021-12-17 | 2022-04-22 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
-
2017
- 2017-10-23 CN CN201721374567.0U patent/CN207783190U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112839398A (en) * | 2019-11-25 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and dry burning detection method thereof |
| CN114390737A (en) * | 2021-12-17 | 2022-04-22 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
| CN114390737B (en) * | 2021-12-17 | 2024-06-07 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10638551B2 (en) | Electromagnetic heating control circuit and electromagnetic heating device | |
| CN207783190U (en) | Electromagnetic heating system and its heating control apparatus | |
| CN107155230A (en) | Electromagnetic Heating cooker and its heating control circuit and low-power method for heating and controlling | |
| CN106686786B (en) | Electromagnetic heater and its control method and control circuit | |
| CN102781130B (en) | Large-power electromagnetic cooker circuit based on power electronic technology | |
| CN105745992A (en) | Synchronization circuit for powering cooktop dual induction coil heating zone | |
| CN204442725U (en) | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear | |
| CN203086769U (en) | Commercial induction cooker | |
| CN206835397U (en) | Electromagnetic heater and its heating control circuit | |
| CN203951636U (en) | The motherboard circuit of electromagnetic heater | |
| CN206410183U (en) | A kind of circuit for being used to improve power of variable-frequency microwave oven factor | |
| CN109425777A (en) | Electromagnetic heating apparatus and its power failure detection method and device | |
| CN202998532U (en) | Electromagnetic induction heating control circuit based on digital signal processing | |
| CN204518107U (en) | Electromagnetic Heating control circuit and electromagnetic appliance | |
| JP5482211B2 (en) | Snubber circuit for power converter | |
| CN109982466A (en) | Electromagnetic heating apparatus and its heating control apparatus and method | |
| CN101500350A (en) | Electromagnetic furnace control circuit and electromagnetic furnace using the same | |
| CN105605628B (en) | Surge restraint circuit and micro-wave oven | |
| KR100666509B1 (en) | Harmonic filter | |
| CN204905710U (en) | Prevent condensation cubical switchboard | |
| CN208189366U (en) | Transformer, power supply unit and microwave cooking electric appliance | |
| CN208094830U (en) | For electric installation and microwave cooking electric appliance | |
| CN110446287A (en) | The IGBT control device of electric cooking apparatus and electric cooking apparatus, method | |
| CN207573657U (en) | The resonant heating circuit of electromagnetic cooking appliance and with its electromagnetic cooking appliance | |
| CN107404779A (en) | Electromagnetic Heating cooking system and its heating control apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |