CN206674225U - The circuit system and cooking apparatus of protection circuit - Google Patents
The circuit system and cooking apparatus of protection circuit Download PDFInfo
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- CN206674225U CN206674225U CN201720458670.7U CN201720458670U CN206674225U CN 206674225 U CN206674225 U CN 206674225U CN 201720458670 U CN201720458670 U CN 201720458670U CN 206674225 U CN206674225 U CN 206674225U
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- circuit
- power tube
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- circuit system
- voltage
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Abstract
The utility model provides the circuit system and cooking apparatus of a kind of protection circuit, and the circuit system is used for IH heaters, including：Drive circuit, maximum ON time is determined for detecting the voltage of power tube, and according to the voltage；Comparison circuit, for comparing current flow and default maximum current；The drive circuit, it is additionally operable to when duration reaches the maximum ON time, or, when the comparison circuit determines that the current flow is more than the maximum current, the power tube is closed.As can be seen here, in the utility model, according to maximum ON time and default maximum current, the shut-off of power tube is controlled by drive circuit, realizes and more accurately controls, be effectively protected power tube.
Description
Technical field
It the utility model is related to the circuit system and cooking apparatus of a kind of protection circuit.
Background technology
Existing cooking apparatus uses sensing heating (Induction Heating, IH) mode of heating, and IH mode of heatings are
It is basic under invariable power that pulse width manner is determined come driving power pipe using fixed frequency so that electric current by coil panel, and then coil panel with
Resonant capacitance resonance produces alternating magnetic field and carries out acting heating to irony pan.However, when fixed frequency is determined by the way of pulsewidth
Some instantaneous voltages are too high (surge voltage), can cause permanently to damage by the electric current constantly increase power tube of power tube
It is bad, so cause complete machine can not also be continuing with, shorten the life-span of complete machine.
Utility model content
A series of concept of reduced forms is introduced in utility model content part, this will be in specific embodiment part
It is further described.Utility model content part of the present utility model is not meant to attempt to limit claimed
The key feature and essential features of technical scheme, do not mean that the protection for attempting to determine technical scheme claimed more
Scope.
In order to solve the above problems at least in part, the utility model provides a kind of circuit system of protection circuit, institute
State circuit system and be used for IH heaters, including：
Drive circuit, maximum ON time is determined for detecting the voltage of power tube, and according to the voltage；
Comparison circuit, for comparing current flow and default maximum current；
The drive circuit, it is additionally operable to when duration reaches the maximum ON time, or, is determined in the comparison circuit
When the current flow is more than the maximum current, the power tube is closed.
Exemplarily, the drive circuit, is specifically used for：When duration reaches the maximum ON time, or, described
When comparison circuit determines that the current flow is more than or equal to the maximum current, by the way that the gate-drive of the power tube is set
The power tube is closed for low level.
Exemplarily, the comparison circuit, is specifically used for：At the resistance for comparing the emitter stage for being serially connected with the power tube
Current flow and the default maximum current.
Exemplarily, the comparison circuit, is specifically used for：Partial pressure and default maximum electricity by the resistance
Pressure, come current flow described in comparison and the default maximum current, wherein, the default maximum voltage with it is described default
The ratio of maximum current is equal to the size of the resistance.
Exemplarily, the resistance for being serially connected with the emitter stage of the power tube is constantan wire.
Exemplarily, the voltage for the power tube that the drive circuit detects is bigger, then sets the maximum conducting
Time is shorter.
Exemplarily, the circuit system also includes synchronous circuit, the drive circuit, is additionally operable to：In the synchronous electricity
When road overturns voltage, the power tube is turned on.
Exemplarily, the power tube is insulated gate bipolar transistor IGBT.
The utility model additionally provides a kind of cooking apparatus, including foregoing circuit system.
As can be seen here, in the utility model, according to maximum ON time and default maximum current, controlled by drive circuit
The shut-off of power tube, realizes and more accurately controls, and is effectively protected power tube.
Brief description of the drawings
, below will be to this practicality in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in new embodiment, it should be apparent that, drawings described below is only one
A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these
Accompanying drawing obtains other accompanying drawings.In the accompanying drawings, identical reference typically represents same or analogous part.
Fig. 1 is a schematic block diagram of the circuit system of protection circuit of the present utility model；
Fig. 2 is a schematic diagram of the circuit system of protection circuit of the present utility model；
Fig. 3 is a schematic block diagram of cooking apparatus of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that described embodiment is part of the embodiment of the present utility model, rather than is all implemented
Example.Based on the embodiment in the utility model, those of ordinary skill in the art institute on the premise of creative work is not made
The every other embodiment obtained, it should all belong to the scope of the utility model protection.
IH is a kind of electromagnetic heating technique, for example, domestic cooking appliance can use IH, in the bottom of cooking apparatus and week
Enclose and carry electromagnet heating element so that the food materials in cooking apparatus can thermally equivalent, therefore, IH is referred to as stereoscopic electric
Magnetic heats.The IH heaters of the present embodiment can be the heater in the cooking apparatus such as electric cooker, electric pressure cooking saucepan, electric cooking pot
Part.
Fig. 1 is the circuit system of protection circuit of the present utility model, and the circuit system is used for IH heaters, the circuit system
System 10 includes drive circuit 12 and comparison circuit 16.
Drive circuit 12, maximum ON time is determined for detecting the voltage of power tube 20, and according to the voltage；
Comparison circuit 16, for comparing current flow and default maximum current；
The drive circuit 12, it is additionally operable to when duration reaches the maximum ON time, or, it is true in the comparison circuit
When the fixed current flow is more than or equal to the maximum current, the power tube 20 is closed.
Power tube 20 can be insulated gate bipolar transistor (Insulated Gate Bipolar Transistor,
IGBT), power tube Q1 as shown in Figure 2.IGBT has gate pole (G), colelctor electrode (C) and emitter stage (E), wherein, gate pole (G)
Grid (G) is properly termed as, colelctor electrode (C) is referred to as source electrode (D), and emitter stage (E) is referred to as draining (S).It is understood that
Power tube 20 can also be the other kinds of power tube outside IGBT, originally new that this is not limited.
Reference picture 2, the driving generator shown in Fig. 2 are the drive circuit 12 in Fig. 1, the comparator shown in Fig. 2
U1C is the comparison circuit 16 in Fig. 1.Wherein, it can be that integrated form drives generator or discrete driving hair to drive generator
Raw device, integrated form drive generator to be made up of the logic digital circuits and analog circuit being integrated in single-chip microcomputer, and discrete is driven
Dynamic generator is made up of voltage comparator.
After filtering of the civil power by safety electric capacity C1 after rectification, power tube Q1 by drive generator export high level and
Begin to turn on.
After power tube Q1 conductings, drive circuit 12 can detect power tube Q1 voltage, and be set according to the voltage
Maximum ON time.When power tube Q1 conducting duration reaches the maximum ON time, drive circuit 12 closes power tube.
Specifically, power tube Q1 gate pole (G) voltage can be set to low level so as to which power tube Q1 be closed by drive circuit 12.
During power tube Q1 is on (not up to maximum ON time), comparison circuit 16 can be relatively more current
Electric current and default maximum current.
Exemplarily, comparison circuit 16 can compare current flow at the resistance for the emitter stage for being serially connected with power tube with it is pre-
If maximum current.Reference picture 2, current flow are the electric current at the resistance R3 concatenated with power tube Q1 emitter stage (E).It is default
Maximum current can be understood as allowing the maximum current by power tube Q1, can be entered according to power tube Q1 performance requirement
Row setting.If comparison circuit 16 determines that current flow is more than default maximum current, the output pin of comparison circuit 16 is defeated
Go out low level, and the low level through the output is sent into drive circuit 12, and then drive circuit 12 can close power tube.Specifically
Power tube Q1 gate pole (G) voltage can be set to low level so as to which power tube Q1 be closed by ground, drive circuit 12.
Exemplarily, the partial pressure and default maximum voltage that comparison circuit 16 can be by comparison resistance R3, work as to compare
Preceding electric current and default maximum current.Wherein, the ratio of the default maximum voltage and the default maximum current is equal to
The size of the resistance R3.Reference picture 2, default maximum voltage are referred to as reference voltage, are expressed as VREF.Comparator
U1C pin 8 can detect resistance R3 partial pressure, by it compared with the VREF of pin 9.If the resistance at pin 8
R3 partial pressure is more than the VREF at pin 9, then comparator U1C pin 14 exports low level, and low level is sent into driving electricity
Road 12 (driving generator), drive circuit 12 by its internal logic circuit by power tube Q1 gate pole G be set to low level from
And close power tube Q1.
Wherein, resistance R3 can be constantan wire, or can also be other kinds of power resistor, and this is new unlimited to this
It is fixed.
As can be seen here, in the present embodiment, when condition 1：Power tube conducting duration reaches maximum ON time；With condition 2：When
Preceding electric current reaches predetermined maximum current or resistance R3 partial pressure reaches predetermined maximum voltage；When one of them meets, driving
The gate voltage of power tube is set to low level to close the power tube by circuit 12.
Further, the circuit system 10 also includes synchronous circuit, and drive circuit 12 can be also used for：In the synchronous electricity
When road overturns voltage, the power tube is turned on.Specifically, resonant capacitance C2 and coil panel L1 resonance can be waited, and
Start the conducting of next round after synchronous circuit upset.
In the utility model, it is referred to as a cycle before power tube Q1 can be once conducting to conducting next time.At one
In cycle, power tube Q1 is begun to turn on after synchronous circuit upset, can then be based on maximum ON time T and default maximum
Electric current is controlled power tube Q1 shut-off by drive circuit 12, so as to be in the protection within each cycle to power tube Q1,
Reliability is high and Surge handling capability is strong.
Exemplarily, the voltage for the power tube that drive circuit 12 detects is bigger, then when setting the maximum conducting
Between it is shorter.For example, the cycle for there was only positive voltage is formed, a cycle is divided into some after over commutation in exchange cycle
Part, voltage is V1, V2 ..., Vn respectively.In V1 voltages, it is assumed that maximum ON time is T1.So, when power tube Q1 is turned on
When duration reaches T1, drive circuit 12 closes power tube Q1；Or when not arriving T1, when reaching VREF by resistance R3 partial pressure,
Power tube will be closed；Then wait for conducting power pipe Q1 again after resonant capacitance C2 and the upset of coil panel L1 resonance synchronous circuit.
It is also such working method in voltage V2 ..., Vn, but voltage is higher, maximum ON time also will be shorter.If for example,
V2>V1, the then maximum ON time T2 in V2 voltages<T1.Because voltage is higher, the electric current by resistance R3 is bigger,
It is faster that resistance R3 partial pressures reach VREF.Therefore be directed to different voltage, power tube Q1 maximum ON time not exclusively, this
Sample just forms variable frequency work mode.
As can be seen here, in the utility model, according to maximum ON time and default maximum current, controlled by drive circuit
The shut-off of power tube, realizes and more accurately controls, and is effectively protected power tube.Meanwhile different voltage settings is different
Maximum ON time forms variable frequency work mode, to Electro Magnetic Compatibility (Electromagnetic Compatibility,
EMC) there is extraordinary improvement.
Fig. 3 is a schematic block diagram of cooking apparatus of the present utility model.Cooking apparatus 30 shown in Fig. 3 can include
Circuit system 10, the circuit system 10 is as shown in the previous embodiment.
Wherein, cooking apparatus 30 can be electric cooker, electric pressure cooking saucepan, cooking machine, soy bean milk making machine, electric cooking pot or other electrical heating
Utensil, the utility model are not limited this.
It is understood that other household electrical appliances that the circuit system 10 shown in Fig. 1 or Fig. 2 can also be applied to outside cooking apparatus are set
It is standby, it is originally new that this is not limited.
In the utility model, according to maximum ON time and default maximum current, power tube is controlled by drive circuit
Shut-off, realizes and more accurately controls, be effectively protected power tube, so that the home appliance using the power tube
Life-span it is longer.
It will be understood to those skilled in the art that described above, only specific embodiment of the present utility model, but this reality
It is not limited thereto with new protection domain, the skill that any one skilled in the art discloses in the utility model
In the range of art, change or replacement can be readily occurred in, should all be covered within the scope of protection of the utility model.Therefore, this practicality
New protection domain should be defined by scope of the claims.
Claims (9)
1. a kind of circuit system of protection circuit, it is characterised in that the circuit system is used for sensing heating IH heaters, bag
Include：
Drive circuit, maximum ON time is determined for detecting the voltage of power tube, and according to the voltage；
Comparison circuit, for comparing current flow and default maximum current；
The drive circuit, it is additionally operable to when duration reaches the maximum ON time, or, described in comparison circuit determination
When current flow is more than the maximum current, the power tube is closed.
2. circuit system as claimed in claim 1, it is characterised in that the drive circuit, be specifically used for：Reach institute in duration
When stating maximum ON time, or, when the comparison circuit determines that the current flow is more than or equal to the maximum current, lead to
Cross and the gate-drive of the power tube is set to low level and closes the power tube.
3. circuit system as claimed in claim 1, it is characterised in that the comparison circuit, be specifically used for：Compare and be serially connected with institute
State the current flow at the resistance of the emitter stage of power tube and the default maximum current.
4. circuit system as claimed in claim 3, it is characterised in that the comparison circuit, be specifically used for：By described in comparison
The partial pressure of resistance and default maximum voltage, come current flow described in comparison and the default maximum current, wherein, it is described pre-
If the ratio of maximum voltage and the default maximum current be equal to the size of the resistance.
5. the circuit system as described in claim 3 or 4, it is characterised in that be serially connected with the described of the emitter stage of the power tube
Resistance is constantan wire.
6. circuit system as claimed in claim 1, it is characterised in that the electricity for the power tube that the drive circuit detects
Pressure is bigger, then sets the maximum ON time shorter.
7. circuit system as claimed in claim 1, it is characterised in that the circuit system also includes synchronous circuit, the drive
Dynamic circuit, is additionally operable to：When the synchronous circuit overturns voltage, the power tube is turned on.
8. circuit system as claimed in claim 1, it is characterised in that the power tube is insulated gate bipolar transistor
IGBT。
9. a kind of cooking apparatus, it is characterised in that including the circuit system any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720458670.7U CN206674225U (en) | 2017-04-27 | 2017-04-27 | The circuit system and cooking apparatus of protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720458670.7U CN206674225U (en) | 2017-04-27 | 2017-04-27 | The circuit system and cooking apparatus of protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206674225U true CN206674225U (en) | 2017-11-24 |
Family
ID=60371112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720458670.7U Active CN206674225U (en) | 2017-04-27 | 2017-04-27 | The circuit system and cooking apparatus of protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206674225U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111743424A (en) * | 2019-03-29 | 2020-10-09 | 佛山市顺德区美的电热电器制造有限公司 | Insulation board, control device, control method and electronic cooking appliance |
-
2017
- 2017-04-27 CN CN201720458670.7U patent/CN206674225U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111743424A (en) * | 2019-03-29 | 2020-10-09 | 佛山市顺德区美的电热电器制造有限公司 | Insulation board, control device, control method and electronic cooking appliance |
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