CN206932181U - Electromagnetic oven - Google Patents
Electromagnetic oven Download PDFInfo
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- CN206932181U CN206932181U CN201720800786.4U CN201720800786U CN206932181U CN 206932181 U CN206932181 U CN 206932181U CN 201720800786 U CN201720800786 U CN 201720800786U CN 206932181 U CN206932181 U CN 206932181U
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Abstract
The utility model provides an induction cooker, including alternating current power supply circuit (10), EMC filter circuit (20), major loop (30), switching power supply circuit (40), controllable switch (50) and on-off control circuit (60), EMC filter circuit (20) include common mode inductance (21) and differential mode inductance circuit (22), controllable switch (50) establish ties between common mode inductance (21) and differential mode inductance circuit (22) to be connected with switching power supply circuit (40); the switch control circuit (60) comprises a controller (61) and a switch driving circuit (62), the switch driving circuit (62) is used for outputting a driving signal to the controllable switch (50) according to a control signal output by the controller (61), and the controllable switch (50) is used for controlling the on-off of a line where the controllable switch (50) is located according to the driving signal. The technical scheme provided by the utility model can reduce the stand-by power consumption of electromagnetism stove.
Description
Technical field
It the utility model is related to an electro-technical field, more particularly to a kind of electromagnetic oven.
Background technology
Electro Magnetic Compatibility (Electro Magnetic Compatibility, EMC) refers in same electromagnetic environment, if
It is standby that there is certain noise immunity to electromagnetic interference present in the environment of place, can not be normal because of the interference effect of other equipment
Work；Simultaneously in normal operation to electromagnetic interference is no more than certain limit value caused by the environment of place, not to other equipment
Have an impact the interference of work.Electromagnetic oven is as conventional heating electrical appliance, it is necessary to meets that the EMC of country forces standard, therefore, needs
To increase EMC filter circuit in the major loop of electromagnetic oven.
Electromagnetic oven generally comprises working condition, holding state and off-mode, and in the standby state, heating major loop stops
Work, but power supply is still in on-state.In order to by requirement of the international standard to electromagnetic oven stand-by power consumption, reduce electromagnetic oven
Stand-by power consumption, conventional method are in the standby state to disconnect major loop.Meanwhile in order to meet EMC requirements, then need opening
Closing power unit also increases EMC filter circuit.For example Patent No. CN205946222U patent discloses a kind of low-power and treated
Electromechanical road and electromagnetic oven, gate-controlled switch circuit is set, positioned at controllable by the upstream of the first EMC filter circuit on major loop
Second EMC filter circuit is set in the switching power circuit of on-off circuit upstream, meets EMC while realizing and reduce stand-by power consumption
It is required that.
But electromagnetic oven it is standby when switching power supply parts independent EMC filter circuit is set, switching power supply parts need to increase
The element added is more, and power consumption when electromagnetic oven is standby is still higher.
Utility model content
In view of this, the utility model provides a kind of electromagnetic oven, for reducing the stand-by power consumption of electromagnetic oven.
To achieve these goals, the utility model provides a kind of electromagnetic oven, including AC power circuit, Electro Magnetic Compatibility
EMC filter circuit, major loop, switching power circuit, gate-controlled switch and ON-OFF control circuit；
EMC filter circuit includes the common mode inductance and differential mode inductance circuit being connected with each other, the input of common mode inductance and friendship
Power circuit connection is flowed, the input of the output end of common mode inductance respectively with differential mode inductance circuit and switching power circuit is connected,
The output end of differential mode inductance circuit is connected with major loop；
Gate-controlled switch is connected on the live wire or zero line between common mode inductance and differential mode inductance circuit, and and switch power supply
The output end connection on road；
ON-OFF control circuit includes controller and switch driving circuit, the input of controller and switching power circuit it is defeated
Go out end connection, the input of the output end of controller and switch driving circuit connects, the output end of switch driving circuit with it is controllable
The input connection of switch；Controller is used to be driven to switch driving circuit output control signal, switch according to the state of electromagnetic oven
Dynamic circuit is used to export drive signal for driving gate-controlled switch to be opened and closed to gate-controlled switch according to control signal, and gate-controlled switch is used
The break-make of circuit where gate-controlled switch is controlled according to drive signal.
By said structure, when electromagnetic oven is standby, the live wire of common mode inductance output end can be cut off by gate-controlled switch
Or a circuit in zero line, to cut off differential mode inductance circuit and major loop so that electromagnetic oven in the standby state, only common mode
Inductance and switching power circuit are in running order, so as to keep relatively low standby power；Meanwhile common mode inductance is combined and opened
Capacitor element inside powered-down source circuit can meet the EMC requirements of switching power circuit part, it is not necessary to switching power circuit
Part sets independent EMC filter circuit, and common mode inductance only consumes faint electric energy, hardly increases stand-by power consumption, therefore
Stand-by power consumption can be effectively reduced.
As a kind of optional embodiment of the utility model, gate-controlled switch is relay, and relay includes the first input
End and the second input；
The output end of switch driving circuit and the first input end of relay connect, the second input and the switch of relay
The output end connection of power circuit.
As a kind of optional embodiment of the utility model, switch driving circuit includes triode, first resistor and the
Two resistance；
The first input end of the colelctor electrode of triode and relay connects, the base stage of triode respectively with first resistor one
The other end ground connection of end, one end connection of second resistance, the emitter stage of triode and second resistance, the other end of first resistor with
The output end connection of controller.
As a kind of optional embodiment of the utility model, differential mode inductance circuit includes：Differential mode inductance, the first electric capacity and
Second electric capacity；
The both ends of first electric capacity and the second electric capacity are connected with live wire and zero line respectively, differential mode inductance be connected on the first electric capacity with
Between second electric capacity.
As a kind of optional embodiment of the utility model, filtering is connected between common mode inductance and switching power circuit
Electric capacity.The EMC filter effects of switching power circuit part can so be improved.
As a kind of optional embodiment of the utility model, X electricity is parallel between common mode inductance and AC power circuit
Hold.It so can further improve the effect for filtering out interference of EMC filter circuit.
As a kind of optional embodiment of the utility model, the input of common mode inductance is connected with Y capacitance.So can be with
Meet grounding requirement while the effect for filtering out interference of EMC filter circuit is further improved.
As a kind of optional embodiment of the utility model, major loop includes：Rectifier bridge, switching power circuit include：
Rectification circuit and Switching Power Supply；
Rectification circuit and the input of Switching Power Supply connect, and rectification circuit is used for when circuit disconnects, and one with rectifier bridge
Half-wave rectifying circuit is mutually formed, when circuit is connected, full-wave rectifying circuit is formed with rectifier bridge.
Realize the rectification of switching power circuit part jointly by the rectifier bridge in rectification circuit and major loop, can be effective
Reduce the rectifier cell of switching power circuit part, so as to reduce electromagnetic oven it is standby when power consumption.
As a kind of optional embodiment of the utility model, rectification circuit includes two commutation diodes；
The positive pole of two commutation diodes is connected with the zero line and live wire of common mode inductance output end respectively, two poles of rectification two
The negative pole of pipe is connected with the input of Switching Power Supply.
As a kind of optional embodiment of the utility model, major loop also includes：Filter circuit, resonance circuit, insulation
Grid bipolar transistor IGBT and IGBT drive circuit；
Filter circuit and IGBT are connected in parallel on two phase output terminals of rectifier bridge, resonance circuit be connected on filter circuit and IGBT it
Between, the input of IGBT drive circuit is connected with ON-OFF control circuit, and the output end of IGBT drive circuit is connected with IGBT.
Construction of the present utility model and its other purpose of utility model and beneficial effect will be in conjunction with the accompanying drawings
Description of preferred embodiments and it is more obvious understandable.
Brief description of the drawings
Fig. 1 is the circuit module schematic diagram of electromagnetic oven provided by the utility model；
Fig. 2 is a kind of circuit theory schematic diagram of electromagnetic oven provided by the utility model；
Fig. 3 is another circuit theory schematic diagram of electromagnetic oven provided by the utility model；
Fig. 4 is another circuit theory schematic diagram of electromagnetic oven provided by the utility model.
Description of reference numerals：
10- AC power circuits；20-EMC filter circuits；
30- major loops；40- switching power circuits；
50- gate-controlled switches；60- ON-OFF control circuits；
21- common mode inductances；22- differential mode inductance circuits；
31- rectifier bridges；32- filter circuits；
33- resonance circuits； 34-IGBT；
35-IGBT drive circuits；
41- rectification circuits；42- Switching Power Supplies；
61- controllers；62- switch driving circuits.
Embodiment
Fig. 1 is the circuit module schematic diagram of electromagnetic oven provided by the utility model, and Fig. 2 is electromagnetism provided by the utility model
A kind of circuit theory schematic diagram of stove, Fig. 3 be electromagnetic oven provided by the utility model another circuit theory schematic diagram, Fig. 4
For another circuit theory schematic diagram of electromagnetic oven provided by the utility model.As Figure 1-Figure 4, the electricity that the present embodiment provides
Magnetic stove includes AC power circuit 10, EMC filter circuit 20, major loop 30, switching power circuit 40, gate-controlled switch 50 and switch
Control circuit 60, EMC filter circuit 20 include the common mode inductance 21 and differential mode inductance circuit 22 being connected with each other, common mode inductance 21
Input is connected with AC power circuit 10, the output end of common mode inductance 21 respectively with differential mode inductance circuit 22 and switch power supply
The input connection on road 40, the output end of differential mode inductance circuit 22 are connected with major loop 30；Gate-controlled switch 50 is connected on common mode electricity
On live wire or zero line between sense 21 and differential mode inductance circuit 22, and it is connected with the output end of switching power circuit 40；Switch control
Circuit 60 processed includes controller 61 and switch driving circuit 62, the input of controller 61 and the output end of switching power circuit 40
Connection, the output end of controller 61 is connected with the input of switch driving circuit 62, the output end of switch driving circuit 62 and can
The input connection of control switch 50；Controller 61 is used to the output control of switch driving circuit 62 be believed according to the state of electromagnetic oven
Number, switch driving circuit 62 is used to export the driving for driving gate-controlled switch 50 to be opened and closed to gate-controlled switch 50 according to control signal
Signal, gate-controlled switch 50 are used for the break-make that the place circuit of gate-controlled switch 50 is controlled according to drive signal.
Specifically, the state of electromagnetic oven generally comprises working condition, holding state and off-mode, in the operating condition,
Electromagnetic oven can heat to pan；In the standby state, the heating major loop 30 of electromagnetic oven is stopped.The present embodiment
In, when electromagnetic oven is standby, one in the live wire or zero line of the output end of common mode inductance 21 can be cut off by gate-controlled switch 50
Circuit, to cut off differential mode inductance circuit 22 and major loop 30 so that electromagnetic oven in the standby state, only common mode inductance 21 and is
The switching power circuit 40 that light current device provides electric energy is in running order, so as to keep relatively low standby power；Meanwhile
The capacitor element that common mode inductance 21 is combined inside switching power circuit 40 can meet that the EMC of the part of switching power circuit 40 will
Ask, it is not necessary to which the part of switching power circuit 40 sets independent EMC filter circuit 20, and the electricity that 21 consumption of common mode inductance are faint
Can, hardly increase stand-by power consumption, therefore stand-by power consumption can be effectively reduced.
In the present embodiment, common mode inductance 21 is mainly used in filtering common mode interference；Differential mode inductance circuit 22 is mainly used in filtering
DM EMI, its specific circuit structure the present embodiment are not particularly limited.
Gate-controlled switch 50 is connected with switching power circuit 40, is powered by switching power circuit 40.ON-OFF control circuit 60 is logical
Cross to gate-controlled switch 50 and send drive signal, driving gate-controlled switch 50 is opened or closed, and then realizes that the institute of gate-controlled switch 50 is online
Road it is open or closed, namely differential mode inductance circuit 22 and major loop 30 is open or closed.
Gate-controlled switch 50 is specifically as follows relay or controllable silicon etc., and lower-cost relay is preferably selected in the present embodiment
Device, and relay implement body can use electromagnetic relay.Controller 61 in ON-OFF control circuit 60 is specifically as follows microcontroller
Unit (Microcontroller Unit, MCU).
When electromagnetic oven is in holding state, MCU can be exported to switch driving circuit 62 for disconnecting gate-controlled switch 50
Control signal, switch driving circuit 62 according to the control signal to relay export for disconnect gate-controlled switch 50 driving believe
Number, driving relay disconnects, then differential mode inductance circuit 22 and major loop 30 disconnect, and common mode inductance 21 combines switching power circuit 40
The EMC filtering of the part of switching power circuit 40 is realized in internal capacitor element.When electromagnetic oven resumes work state, MCU can be with
The control signal for closing gate-controlled switch 50 is exported to switch driving circuit 62, switch driving circuit 62 is according to the control signal
The drive signal for closing gate-controlled switch 50 is exported to relay, driving relay closes, then differential mode inductance circuit 22 and master
Loop 30 is connected, and common mode inductance 21 combines the EMC filtering that differential mode inductance circuit 22 realizes the part of major loop 30.
Major loop 30 mainly realizes the heating function to pan, and its particular circuit configurations the present embodiment is not particularly limited,
It can be the circuit of major loop 30 in existing electromagnetic oven.
Switching power circuit 40 is mainly that light current device provides electric energy, can include rectification circuit in switching power circuit 40
41 and Switching Power Supply 42.The alternating current exported from AC power circuit 10, after first passing around the interference of the filtering common mode of common mode inductance 21,
The capacitor element passed through again in switching power circuit 40 carries out smothing filtering and filters out DM EMI, and passes through switch power supply
Alternating current is converted to direct current by the rectification circuit 41 in road 40, and last DC supply input is into Switching Power Supply 42, Switching Power Supply
42 are converted to high voltage direct current the low-voltage DC of light current device needs, are powered for weakness device.
In terms of rectification, in the prior art, the standby work(of electromagnetic oven is being reduced using the method for disconnecting major loop 30
Time-consuming, the part of switching power circuit 40 of electromagnetic oven is generally also to set independent full-wave rectifying circuit, such as the above-mentioned patent No.
A kind of low power standby circuitry and electromagnetic oven disclosed in patent for CN205946222U, positioned at gate-controlled switch circuit upstream
Switching power circuit in independent bridge rectifier is set, realize the rectification of switching power circuit part.So it is also required to
Increase more element, thus can increase electromagnetic oven it is standby when power consumption.
In the present embodiment, major loop 30 can include：Rectifier bridge 31, switching power circuit 40 include above-mentioned rectification circuit 41
With Switching Power Supply 42；Wherein, rectification circuit 41 is connected with the input of Switching Power Supply 42, and rectification circuit 41 is used to disconnect in circuit
When, half-wave rectifying circuit 41 is formed with a phase of rectifier bridge 31, when circuit is connected, full-wave rectifying circuit is formed with rectifier bridge 31
41。
Electromagnetic oven, it is necessary to be the load supplying on major loop 30, therefore, it is necessary to improves switch power supply in working condition
The load capacity on road 40.In holding state, the load on major loop 30 does not work electromagnetic oven, it is only necessary to provides and maintains electromagnetic oven to treat
The minimum voltage of machine, and it is standby when power consumption it is the smaller the better.It can be exported by different rectification circuits 41 different straight
Flow voltage.
In the present embodiment, the rectifier bridge 31 in rectification circuit 41 and major loop 30 realizes the part of switching power circuit 40 jointly
Rectification.Specifically, when electromagnetic oven is in holding state, the place circuit of gate-controlled switch 50 disconnects, rectification circuit 41 and rectification
One phase of bridge 31 forms half-wave rectifying circuit 41.Under halfwave rectifier mode, generally have between input voltage and output voltage
Certain proportionate relationship, and the proportionality coefficient of output voltage and input voltage is generally smaller.For example, Uout=0.45*Uin, wherein,
UinFor input voltage, UoutFor output voltage.So when electromagnetic oven is in holding state, can be dropped by halfwave rectifier mode
The operating voltage of low electromagnetic oven, therefore power consumption of the electromagnetic oven in holding state can be reduced, while switch electricity can also be reduced
The external Conduction Interference of the part of source circuit 40 and radiation, and then the EMC filter effects of the part of switching power circuit 40 are more preferably.And
And the control circuit provided compared to prior art, the present embodiment, due to passing through the rectification in rectification circuit 41 and major loop 30
Bridge 31 realizes rectification jointly, therefore can effectively reduce increased element, so as to reduce electromagnetic oven it is standby when power consumption.Work as electromagnetism
When stove is in running order, the place circuit of gate-controlled switch 50 is connected, and rectification circuit 41 and rectifier bridge 31 form full-wave rectifying circuit
41.Under way of full-wave rectification, generally there is certain proportionate relationship between input voltage and output voltage, and output voltage with
The proportionality coefficient of input voltage is generally larger, for example, Uout=0.9*Uin.So when electromagnetic oven is in running order, pass through
Way of full-wave rectification can lift rectifier output voltage, and then the load capacity of lifting switch power circuit 40.
Wherein, rectification circuit 41 can specifically include two commutation diodes；The positive pole of two commutation diodes respectively with
The zero line of the output end of common mode inductance 21 connects with live wire, and the negative poles of two commutation diodes connects with the input of Switching Power Supply 42
Connect.
So that gate-controlled switch 50 is arranged on zero line as an example, when electromagnetic oven is in holding state, where gate-controlled switch 50
Live wire disconnects, then a phase of the commutation diode being connected with zero line and rectifier bridge 31 can then form half-wave rectifying circuit 41.When
When electromagnetic oven is in running order, the live wire where gate-controlled switch 50 is connected, then two commutation diodes and the two of rectifier bridge 31
Phase can then form full-wave rectifying circuit 41.
Above-mentioned rectifier bridge 31 is the rectification circuit in major loop 30, as a kind of concrete implementation mode, major loop 30
Filter circuit 32, resonance circuit 33, insulated gate bipolar transistor (Insulated Gate Bipolar can also be included
Transistor, IGBT) 34 and IGBT drive circuit 35；Wherein, filter circuit 32 and IGBT34 are connected in parallel on the two of rectifier bridge 31
Phase output terminal, resonance circuit 33 are connected between filter circuit 32 and IGBT34, the input and switch of IGBT drive circuit 35
Control circuit 60 is connected, and the output end of IGBT drive circuit 35 is connected with IGBT34.Filter circuit 32, resonance circuit 33,
The particular circuit configurations of IGBT34 and IGBT drive circuit 35 can use the corresponding circuits in existing electromagnetic oven, and the present embodiment is not
It is particularly limited.
In order to improve the EMC filter effects of the part of switching power circuit 40, in the present embodiment, can common mode inductance 21 with
Filter capacitor is connected between switching power circuit 40.The filter capacitor can be specifically electrochemical capacitor, and the cost of electrochemical capacitor is low,
Power is small, and in selection, the capacity of electrochemical capacitor and the capacity of Switching Power Supply 42 match.It is of course also possible in common mode inductance 21
Other are connected between switching power circuit 40 includes the filter circuit of differential mode inductance or multiple electric capacity, more preferable to reach
EMC filter effects.
In addition, in the present embodiment, can also between common mode inductance 21 and AC power circuit 10 X electric capacity in parallel, to enter
One step improves the effect for filtering out interference of EMC filter circuit 20.It should be noted that the capacity of X electric capacity can not be too big, such as can
Below 1 μ F, while EMC filter effects are improved, to meet the requirement of stand-by power consumption.
In addition, in the present embodiment, Y capacitance can also be connected in the input of common mode inductance 21, further to improve EMC filters
Wave circuit 20 filters out the effect of interference, while meets grounding requirement.Y capacitance generally all be connection two, the one of two Y capacitances
End is connected with live wire and zero line respectively, and the other end of two Y capacitances is grounded.X electric capacity and Y capacitance can be connected to common mode simultaneously
The upstream of inductance 21.
Particular circuit configurations of the present utility model are described in detail with reference to Fig. 2-Fig. 4.
As shown in Fig. 2 alternating voltage circuit includes AC power AC, fuse FUSE1 and piezo-resistance RZ1, exchange
Power supply AC has live wire L and zero line N.Wherein, fuse FUSE1 is arranged on live wire, and is arranged on the upper of piezo-resistance RZ1
Trip, piezo-resistance RZ1 both ends are connected with live wire and zero line respectively.
EMC filter circuit 20 includes common mode inductance 21 (L1) and differential mode inductance circuit 22, and differential mode inductance circuit 22 includes：Difference
Mould inductance L2, the first electric capacity C1 and the second electric capacity C2；First electric capacity C1 and the second electric capacity C2 both ends respectively with live wire and zero line
Connection, differential mode inductance L2 are connected between the first electric capacity C1 and the second electric capacity C2, form п shape filter circuits.
Gate-controlled switch 50 is relay RLY1, and it can be connected on live wire or zero line, with relay RLY1 connections in Fig. 2
It is illustrative exemplified by zero line.ON-OFF control circuit 60 includes controller 61 (MCU) and switch driving circuit 62, opens
Closing drive circuit 62 includes triode Q1, first resistor R1 and second resistance R2.Triode Q1 colelctor electrode and relay RLY1
First input end connection, one end with first resistor R1, second resistance R2 one end are connected triode Q1 base stage respectively, three
Pole pipe Q1 emitter stage and second resistance R2 other end ground connection, the first resistor R1 other end and MCU output end connect.
Major loop 30 include rectifier bridge 31 (BG1), filter circuit 32 (C3), resonance circuit 33 (L3 and C4), IGBT34 and
IGBT drive circuit 35.Wherein, rectifier bridge 31 (BG1) includes 4 diodes, for alternating current to be transformed into direct current；Filtering
Circuit 32 (C3) is used to carry out smothing filtering to direct current；Resonance circuit 33 is main heating circuit, for produce vibration, drum and
The mutual discharge and recharge of resonant capacitance, magnetic field energy is converted to by electric field energy；IGBT34 causes resonance circuit 33 to vibrate, IGBT
Drive circuit 35 can drive IGBT34 turn-on and turn-off according to the IGBT control signals that MCU is sent.
Switching power circuit 40 includes rectification circuit 41 and Switching Power Supply 42, and rectification circuit 41 includes two commutation diodes
D1 and D2.First power output end VDD of Switching Power Supply 42 is connected with MCU, and second source output end VCC and relay RLY1 connects
Connect.
Connected between rectification circuit 41 and Switching Power Supply 42 electrochemical capacitor EC1, EC1 one end be connected to rectification circuit 41 with
Between Switching Power Supply 42, other end ground connection.
In the present embodiment, when electromagnetic oven is in holding state, MCU sends control signal according to the state of electromagnetic oven,
Switch driving circuit 62 is opened according to control signal control relay RLY1, common mode inductance 21 (L1) and differential mode inductance circuit 22 it
Between zero line disconnect.Now, the EMC filter circuit 20 when common mode inductance L1 and electrochemical capacitor EC1 compositions are standby, switch electricity is realized
The EMC filtering of the part of source circuit 40.Meanwhile commutation diode D1, Switching Power Supply 42, MCU, the diode in the upper left corner of rectifier bridge 31
Path can be formed；And the path that commutation diode D2, Switching Power Supply 42, MCU, the diode in the lower left corner of rectifier bridge 31 are formed,
Because relay RLY1 has cut off the zero line between common mode inductance 21L1 and differential mode inductance circuit 22, cause the paths breaking.
Therefore, when electromagnetic oven is in holding state, commutation diode D1 and rectifier bridge 31 form half-wave rectifying circuit 41.
When electromagnetic oven is in running order, MCU sends control signal, switch driving circuit 62 according to the state of electromagnetic oven
Closed according to control signal control relay RLY1, the zero line between common mode inductance 21 and differential mode inductance circuit 22 is connected.Now,
Common mode inductance 21 and differential mode inductance circuit 22 form the EMC filter circuit 20 of major loop 30, realize the EMC filtering of major loop 30.
Meanwhile commutation diode D1, Switching Power Supply 42, MCU, the diode in the upper left corner of rectifier bridge 31 can form a path, rectification
Diode D2, Switching Power Supply 42, MCU, the diode in the lower left corner of rectifier bridge 31 can form another path.Therefore, electromagnetism is worked as
When stove is in running order, commutation diode D1 and rectifier bridge 31 form full-wave rectifying circuit 41.
Fig. 3 is similar with Fig. 2, is with Fig. 2 difference, in common mode inductance 21L1 and AC power circuit 10 in Fig. 3
Between be parallel with X electric capacity C5.When electromagnetic oven is in holding state, C5, L1, EC1 realize the part of switching power circuit 40 jointly
EMC filtering, when electromagnetic oven is in running order, C5, L1, differential mode inductance circuit realize jointly major loop 30 EMC filtering.
Fig. 4 is also similar with Fig. 2, is with Fig. 2 difference, in common mode inductance 21L1 and AC power circuit in Fig. 4
Y capacitance CY1 and CY2 are parallel between 10.When electromagnetic oven is in holding state, CY1, CY2, L1, EC1 realize switch electricity jointly
The EMC filtering of the part of source circuit 40, when electromagnetic oven is in running order, CY1, CY2, L1, differential mode inductance circuit are realized jointly
The EMC filtering of major loop 30.
Electromagnetic oven provided by the utility model, when electromagnetic oven is standby, it is defeated common mode inductance can be cut off by gate-controlled switch
The circuit gone out in the live wire or zero line at end, to cut off differential mode inductance circuit and major loop so that electromagnetic oven is in holding state
Under, only common mode inductance and switching power circuit is in running order, so as to keep relatively low standby power；Meanwhile altogether
Capacitor element inside mould inductance combination switching power circuit can meet the EMC requirements of switching power circuit part, it is not necessary to
Switching power circuit part sets independent EMC filter circuit, and common mode inductance only consumes faint electric energy, and hardly increase is treated
Machine power consumption, therefore stand-by power consumption can be effectively reduced.
It will be understood by those skilled in the art that the present embodiment this sentence electromagnetic oven exemplified by be illustrated, implementing
During, it is also applied in the device that baking box etc. needs EMC certifications.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of electromagnetic oven, including AC power circuit (10), Electro Magnetic Compatibility EMC filter circuit (20), major loop (30), open
Powered-down source circuit (40), gate-controlled switch (50) and ON-OFF control circuit (60), it is characterised in that：
The EMC filter circuit (20) includes the common mode inductance (21) and differential mode inductance circuit (22) being connected with each other, the common mode
The input of inductance (21) is connected with the AC power circuit (10), the output end of the common mode inductance (21) respectively with differential mode
Inductive circuit (22) connects with the input of the switching power circuit (40), the output end of the differential mode inductance circuit (22) with
Major loop (30) connection；
The gate-controlled switch (50) be connected on live wire between the common mode inductance (21) and the differential mode inductance circuit (22) or
On zero line, and it is connected with the output end of the switching power circuit (40)；
The ON-OFF control circuit (60) includes controller (61) and switch driving circuit (62), the input of the controller (61)
End is connected with the output end of the switching power circuit (40), output end and the switch driving circuit of the controller (61)
(62) input connection, the output end of the switch driving circuit (62) are connected with the input of the gate-controlled switch (50)；
The controller (61) is used for the state according to the electromagnetic oven to the switch driving circuit (62) output control signal, described
Switch driving circuit (62) is used to be exported for driving described controllable open to the gate-controlled switch (50) according to the control signal
The drive signal of (50) opening and closing is closed, the gate-controlled switch (50) is used to control the gate-controlled switch (50) according to the drive signal
The break-make of place circuit.
2. electromagnetic oven according to claim 1, it is characterised in that the gate-controlled switch (50) is relay, the relay
Device includes first input end and the second input；
The output end of the switch driving circuit (62) is connected with the first input end of the relay, and the second of the relay
Input is connected with the output end of the switching power circuit (40).
3. electromagnetic oven according to claim 2, it is characterised in that the switch driving circuit (62) includes triode, the
One resistance and second resistance；
The colelctor electrode of the triode is connected with the first input end of the relay, the base stage of the triode respectively with it is described
One end of first resistor, one end connection of the second resistance, the emitter stage of the triode and the second resistance it is another
End ground connection, the other end of the first resistor are connected with the output end of the controller (61).
4. electromagnetic oven according to claim 1, it is characterised in that the differential mode inductance circuit (22) includes：Differential mode inductance,
First electric capacity and the second electric capacity；
The both ends of first electric capacity and second electric capacity are connected with the live wire and the zero line respectively, the differential mode inductance
It is connected between first electric capacity and second electric capacity.
5. electromagnetic oven according to claim 1, it is characterised in that the common mode inductance (21) and the switching power circuit
(40) filter capacitor is connected between.
6. electromagnetic oven according to claim 1, it is characterised in that the common mode inductance (21) and the AC power circuit
(10) X electric capacity is parallel between.
7. electromagnetic oven according to claim 1, it is characterised in that the input of the common mode inductance (21) is connected with Y electricity
Hold.
8. according to the electromagnetic oven described in claim any one of 1-7, it is characterised in that the major loop (30) includes：Rectifier bridge
(31), the switching power circuit (40) includes：Rectification circuit (41) and Switching Power Supply (42)；
The rectification circuit (41) is connected with the input of the Switching Power Supply (42), and the rectification circuit (41) is used for described
When circuit disconnects, half-wave rectifying circuit (41) is formed with a phase of the rectifier bridge (31), it is and described when the circuit is connected
Rectifier bridge (31) forms full-wave rectifying circuit (41).
9. electromagnetic oven according to claim 8, it is characterised in that the rectification circuit (41) includes two poles of rectification two
Pipe；
The positive pole of described two commutation diodes is connected with the zero line and live wire of the common mode inductance (21) output end respectively, described
Input of the negative pole of two commutation diodes with the Switching Power Supply (42) is connected.
10. electromagnetic oven according to claim 8, it is characterised in that the major loop (30) also includes：Filter circuit
(32), resonance circuit (33), insulated gate bipolar transistor IGBT (34) and IGBT drive circuit (35)；
The filter circuit (32) and the IGBT (34) are connected in parallel on two phase output terminals of the rectifier bridge (31), the resonance electricity
Road (33) is connected between the filter circuit (32) and the IGBT (34), the input of the IGBT drive circuit (35) with
ON-OFF control circuit (60) connection, the output end of the IGBT drive circuit (35) are connected with the IGBT (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720800786.4U CN206932181U (en) | 2017-07-04 | 2017-07-04 | Electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720800786.4U CN206932181U (en) | 2017-07-04 | 2017-07-04 | Electromagnetic oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206932181U true CN206932181U (en) | 2018-01-26 |
Family
ID=61353030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720800786.4U Active CN206932181U (en) | 2017-07-04 | 2017-07-04 | Electromagnetic oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206932181U (en) |
-
2017
- 2017-07-04 CN CN201720800786.4U patent/CN206932181U/en active Active
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