CN206963112U - Electromagnetic oven - Google Patents
Electromagnetic oven Download PDFInfo
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- CN206963112U CN206963112U CN201720801240.0U CN201720801240U CN206963112U CN 206963112 U CN206963112 U CN 206963112U CN 201720801240 U CN201720801240 U CN 201720801240U CN 206963112 U CN206963112 U CN 206963112U
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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); the switch control circuit (60) comprises a controller (61) and a power supply control circuit (62), the power supply control circuit (62) is used for outputting a power supply control signal for controlling a power supply of the controllable switch (50) 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 circuit where the controllable switch (50) is located according to the power supply control 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 be independently arranged EMC filter circuit, switching power supply parts need to increase
Element and circuit it is more, 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；
ON-OFF control circuit includes controller and power control 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 power control circuit connects, the output end of power control circuit with it is controllable
The input connection of switch；Controller is used for according to the state of electromagnetic oven to power control circuit output control signal, power supply control
Circuit processed is used for the power control signal for exporting the power supply for controlling gate-controlled switch to gate-controlled switch according to control signal,
Gate-controlled switch is used for the break-make of the circuit according to where power control signal controls gate-controlled switch.
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 power control circuit and the first input end of relay connect, the second input end grounding of relay.
As a kind of optional embodiment of the utility model, major loop：Including insulated gate bipolar transistor IGBT and
IGBT drive circuit, the output end with controller, the output end of power control circuit connect the input of IGBT drive circuit respectively
Connect, the output end of IGBT drive circuit is connected with IGBT.It so can further reduce the stand-by power consumption of electromagnetic oven.
As a kind of optional embodiment of the utility model, power control circuit includes the first triode, the two or three pole
Pipe, first resistor, second resistance and 3rd resistor；
The base stage of first triode is connected by first resistor and the output end of controller, and the emitter stage of the first triode connects
Ground, the colelctor electrode of the first triode are connected by second resistance with the base stage of the second triode, and 3rd resistor is connected to the two or three
Between the base stage and emitter stage of pole pipe, the emitter stage of the second triode and the output end of switching power circuit connect, the two or three pole
The colelctor electrode of pipe and the first input end of relay connect.
As a kind of optional embodiment of the utility model, the second input of relay passes through the 4th resistance eutral grounding.
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 and resonance circuit；Filtering
Circuit is connected with rectifier bridge and resonance circuit respectively.
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-IGBT；32-IGBT drive circuits；
33- rectifier bridges；34- filter circuits；
35- resonance circuits；
41- rectification circuits；42- Switching Power Supplies；
61- controllers；62- power control 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；ON-OFF control circuit 60 includes controller 61 and power supply electricity
Road 62, the input of controller 61 are connected with the output end of switching power circuit 40, the output end and power supply of controller 61
The input connection of circuit 62, the output end of power control circuit 62 are connected with the input of gate-controlled switch 50；Controller 61 is used
It is used in the state according to electromagnetic oven to the output control signal of power control circuit 62, power control circuit 62 according to control signal
The power control signal of the power supply for controlling gate-controlled switch 50 is exported to gate-controlled switch 50, gate-controlled switch 50 is used for basis
Power control signal controls the break-make of the place circuit of gate-controlled switch 50.
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 power control signal, driving gate-controlled switch 50 is opened or closed, and then realizes the institute of gate-controlled switch 50
In the open or closed of circuit, 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).Relay includes first input end and the second input；Power control circuit
62 output end and the first input end of relay connect, the second input end grounding of relay.Pass through the of control relay
The power supply of one input, you can the opening and closing of control relay.
When electromagnetic oven is in holding state, MCU can be exported to power control circuit 62 for disconnecting gate-controlled switch 50
Control signal, power control circuit 62 according to the control signal to relay export for disconnect gate-controlled switch 50 power supply electricity
Source power control signal (such as：0 level signal), relay disconnects, then differential mode inductance circuit 22 and major loop 30 disconnect, altogether
The EMC filtering of the part of switching power circuit 40 is realized in the capacitor element that mould inductance 21 is combined inside switching power circuit 40.Work as electricity
Magnetic stove resume work state when, MCU can export the control signal for closing gate-controlled switch 50 to power control circuit 62, electricity
Source control circuit 62 exports the power supply of the power supply for connecting gate-controlled switch 50 according to the control signal to relay
Signal (such as：18V high level signal), relay closure, then differential mode inductance circuit 22 is connected with major loop 30, common mode inductance
21 combine 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.
In the present embodiment, major loop 30 can include insulated gate bipolar transistor (Insulated Gate Bipolar
Transistor, IGBT) 31, IGBT drive circuit 32.The input of IGBT drive circuit 32 can respectively with controller 61
Output end, the connection of the output end of power control circuit 62, the output end of IGBT drive circuit 32 are connected with IGBT31.IGBT31 and
The particular circuit configurations of IGBT32 drive circuits can use the corresponding circuits in existing electromagnetic oven, and the present embodiment does not do special limit
System.
That is, IGBT drive circuit 32 also provides power supply by power control signal 62.When electromagnetic oven is in standby shape
During state, power control circuit 62 exports the power supply for disconnecting gate-controlled switch 50 according to the control signal of controller 61 to relay
The power control signal of power supply simultaneously, also exports the power control signal, then IGBT drive circuit 32 to IGBT drive circuit 32
Power supply disconnect, so as to further reduce stand-by power consumption.When electromagnetic oven is in running order, power supply electricity
Road 62 exports the power supply of the power supply for connecting gate-controlled switch 50 according to the control signal of controller 61 to relay
Signal simultaneously, also exports the power control signal to IGBT drive circuit 32, then the power supply of IGBT drive circuit 32 is connected,
IGBT drive circuit 32 starts normal work.
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 light current 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 41, such as above-mentioned patent
Number for CN205946222U patent disclosed in a kind of low power standby circuitry and electromagnetic oven, positioned at the circuit of gate-controlled switch 50
Independent bridge rectifier 41 is set in the switching power circuit 40 of upstream, realizes the rectification of the part of switching power circuit 40.
So be 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 33, 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 33, when circuit is connected, full-wave rectifying circuit is formed with rectifier bridge 33
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 33 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 33 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 33 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 33 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 33 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 33
Phase can then form full-wave rectifying circuit 41.
Above-mentioned rectifier bridge 33 is the rectification circuit in major loop 30, as a kind of concrete implementation mode, major loop 30
Filter circuit 34 and resonance circuit 35 can also be included；Wherein, filter circuit 34 is connected in parallel on two phase output terminals of rectifier bridge 33, humorous
The circuit 35 that shakes is connected between filter circuit 34 and IGBT31.The particular circuit configurations of filter circuit 34 and resonance circuit 35 can adopt
With the corresponding circuits in existing electromagnetic oven, the present embodiment is not 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
Illustrative exemplified by zero line, relay RLY1 the second input is grounded by the 4th resistance R4.Switch control
Circuit 60 includes controller 61 (MCU) and power control circuit 62, and power control circuit 62 includes the first triode Q1, the two or three
Pole pipe Q2, first resistor R1, second resistance R2 and 3rd resistor R3；First triode Q1 base stage passes through first resistor R1 and control
The output end connection of device 61 processed, the first triode Q1 grounded emitter, the first triode Q1 colelctor electrode pass through second resistance
R2 is connected with the second triode Q2 base stage, and 3rd resistor R3 is connected between the second triode Q2 base stage and emitter stage, the
Two triode Q2 emitter stage is connected with the output end VCC1 of Switching Power Supply 42, the second triode Q2 colelctor electrode and relay
RLY1 first input end connection.Wherein, the first triode Q1 is NPN type triode, and the second triode Q2 is the pole of positive-negative-positive three
Pipe；The VCC1 that Switching Power Supply 42 exports can be converted into VCC2 by ON-OFF control circuit 60, there is provided give relay RLY1.
Major loop 30 include rectifier bridge 33 (BG1), filter circuit 34 (C3), resonance circuit 35 (L3 and C4), IGBT31 and
IGBT drive circuit 32.Wherein, rectifier bridge BG1 includes 4 diodes, for alternating current to be transformed into direct current；Filter circuit
34 (C3) are used to carry out smothing filtering to direct current；Resonance circuit 35 is main heating circuit, for producing vibration, drum and resonance
The mutual discharge and recharge of electric capacity, magnetic field energy is converted to by electric field energy；IGBT31 causes resonance circuit 35 to vibrate, IGBT drivings
Circuit 32 can drive IGBT31 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,
Power control circuit 62 is opened according to control signal control relay RLY1, between common mode inductance L1 and differential mode inductance circuit 22
Zero line disconnects.Now, the EMC filter circuit 20 when common mode inductance L1 and electrochemical capacitor EC1 compositions are standby, realizes switch power supply
The EMC filtering of the part of road 40.Meanwhile commutation diode D1, Switching Power Supply 42, MCU, the rectifier bridge BG1 upper left corners diode can
To form path；And the path that commutation diode D2, Switching Power Supply 42, MCU, the diode in the lower left corner of rectifier bridge 33 are formed, by
The zero line between common mode inductance 21L1 and differential mode inductance circuit 22 has been cut off in relay RLY1, has caused the paths breaking.Cause
This, when electromagnetic oven is in holding state, commutation diode D1 and rectifier bridge BG1 form half-wave rectifying circuit.
When electromagnetic oven is in running order, MCU sends control signal, power control 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 (L1) and differential mode inductance circuit 22 is connected.
Now, common mode inductance 21 (L1) and differential mode inductance circuit 22 form the EMC filter circuit 20 of major loop 30, realize major loop 30
EMC is filtered.Meanwhile commutation diode D1, Switching Power Supply 42, MCU, the diode in the rectifier bridge BG1 upper left corners can form one
Path, commutation diode D2, Switching Power Supply 42, MCU, the diode in the lower left corner of rectifier bridge 33 can form another path.Cause
This, when electromagnetic oven is in running order, commutation diode D1 and rectifier bridge BG1 form full-wave rectifying circuit.
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 (12)
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；
The ON-OFF control circuit (60) includes controller (61) and power control 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 power control circuit of the controller (61)
(62) input connection, the output end of the power control 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 power control circuit (62) output control signal, described
Power control circuit (62) is used to be exported for controlling described controllable open to the gate-controlled switch (50) according to the control signal
The power control signal of the power supply of (50) is closed, the gate-controlled switch (50) is used to control institute according to the power control signal
The break-make of circuit where stating gate-controlled switch (50).
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 power control circuit (62) is connected with the first input end of the relay, and the second of the relay
Input end grounding.
3. electromagnetic oven according to claim 2, it is characterised in that the major loop：Including insulated gate bipolar transistor
IGBT (31) and IGBT drive circuit (32), the input of the IGBT drive circuit (32) respectively with the controller (61)
Output end, the output end of the power control circuit (62) connection, the output end of the IGBT drive circuit (32) with it is described
IGBT (31) connections.
4. electromagnetic oven according to claim 2, it is characterised in that the power control circuit (62) includes the one or three pole
Pipe, the second triode, first resistor, second resistance and 3rd resistor；
The base stage of first triode is connected by the first resistor with the output end of the controller (61), and described first
The grounded emitter of triode, the colelctor electrode of first triode pass through the second resistance and the base of second triode
Pole is connected, and the 3rd resistor is connected between base stage and the emitter stage of second triode, the hair of second triode
Emitter-base bandgap grading is connected with the output end of the switching power circuit (40), and the of the colelctor electrode of second triode and the relay
One input connects.
5. electromagnetic oven according to claim 2, it is characterised in that the second input of the relay passes through the 4th resistance
Ground connection.
6. 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.
7. 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.
8. 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.
9. 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.
10. according to the electromagnetic oven described in claim any one of 1-9, it is characterised in that the major loop (30) includes：Rectifier bridge
(33), 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 (33), it is and described when the circuit is connected
Rectifier bridge (33) forms full-wave rectifying circuit (41).
11. electromagnetic oven according to claim 10, 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.
12. electromagnetic oven according to claim 10, it is characterised in that the major loop (30) also includes：Filter circuit
And resonance circuit (35) (34)；The filter circuit (34) connects with the rectifier bridge (33) and the resonance circuit (35) respectively
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720801240.0U CN206963112U (en) | 2017-07-04 | 2017-07-04 | Electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720801240.0U CN206963112U (en) | 2017-07-04 | 2017-07-04 | Electromagnetic oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206963112U true CN206963112U (en) | 2018-02-02 |
Family
ID=61384151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720801240.0U Active CN206963112U (en) | 2017-07-04 | 2017-07-04 | Electromagnetic oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206963112U (en) |
-
2017
- 2017-07-04 CN CN201720801240.0U patent/CN206963112U/en active Active
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