CN208046582U - Voltage surge protection circuit and electromagnetic heater - Google Patents
Voltage surge protection circuit and electromagnetic heater Download PDFInfo
- Publication number
- CN208046582U CN208046582U CN201820609095.0U CN201820609095U CN208046582U CN 208046582 U CN208046582 U CN 208046582U CN 201820609095 U CN201820609095 U CN 201820609095U CN 208046582 U CN208046582 U CN 208046582U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- surge
- power supply
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a kind of voltage surge protection circuit and electromagnetic heater, the voltage surge protection circuit include：Sequentially connected rectification circuit (1) and aimed semiconductor power component (2), and, the surge detection circuit (3) being connect with the rectification circuit (1), the voltage surge protection circuit further includes：The power supply capacitor C1 being connect with the aimed semiconductor power component (2), and, it is connected to the power supply capacitor detection circuit (4) of the power supply capacitor C1；The power supply capacitor detection circuit (4) is used for when detection knows that the voltage of the power supply capacitor C1 is more than predetermined threshold value, the surge detection circuit (3) is triggered, and controls the aimed semiconductor power component (2) and is switched on or off.The utility model can reliably and accurately avoid the time lengthening of negative sense surging signal and caused by damage of the voltage surge to power semiconductor component, effectively improve the safety in operation and service life of power semiconductor component.
Description
Technical field
The utility model is related to circuit system protection technique fields, and in particular to a kind of voltage surge protection circuit and electromagnetism
Heating device.
Background technology
In the electromagnetic heating circuit of electromagnetic heater for power conversion power semiconductor component operation power compared with
Greatly, it is therefore desirable to the transient voltage surge mutation generated in circuit be protected, to avoid the semiconductor converted for power
Power component damages.
The voltage surge mode of electromagnetic heater is generally using unidirectional positive surge mode, i.e., when surging signal arrives
When, it is acted on by the instantaneous short circuit of ceramic disc capacitor, moment raises surge detection voltage, and comparator overturning generates interrupt signal.But
Be actual conditions it is not absolute positive surging signal, it is that first will produce a negative sense surge, then generate one to encounter most
A forward impact signal.
In this case, since negative sense surging signal can drag down rapidly surge mouth level, then restore to draw high surge mouth electricity
Pressure, it will generate the delay of a period of time, delay time can reach several harmonic periods, thus can not be in semiconductor power member
It is protected before the surge top of part and fully relies on power semiconductor component itself into horizontal high voltage resistance, to miss most preferably
Voltage surge protection opportunity.
Utility model content
For the problems of the prior art, a kind of voltage surge protection circuit of the utility model offer and electromagnetic heating dress
Set, can reliably and accurately avoid the time lengthening of negative sense surging signal and caused by voltage surge to power semiconductor component
Damage, effectively improve the safety in operation and service life of power semiconductor component.
In order to solve the above technical problems, the utility model provides following technical scheme：
In a first aspect, the utility model provides a kind of voltage surge protection circuit, including sequentially connected rectification circuit and
Aimed semiconductor power component, and, the surge detection circuit being connect with the rectification circuit, the voltage surge protection circuit
Further include：The power supply capacitor C1 being connect with the aimed semiconductor power component, and, it is connected to the confession of the power supply capacitor C1
Electric capacitive detection circuit；
The power supply capacitor detection circuit is used to, when the voltage for detecting the power supply capacitor C1 is more than predetermined threshold value, touch
It sends out surge detection circuit described, and controls the aimed semiconductor power component and be switched on or off.
Further, the voltage surge protection circuit further includes：Push-pull circuit, and it is connected with arteries and veins on the push-pull circuit
Rush sequence generator PPG, wherein the PPG programme pulse generator PPG is arranged with aimed semiconductor power component in same electromagnetism
In heating device；
The output end of the push-pull circuit is connect with the aimed semiconductor power component, the input terminal of the push-pull circuit
It is connect with the power supply capacitor detection circuit；
Corresponding, the power supply capacitor detection circuit is switched on or off in the control aimed semiconductor power component
When, it also controls the push-pull circuit and closes the PPG programme pulse generator PPG.
Further, the power supply capacitor detection circuit includes：Resistance R31, R32 and the R33 being sequentially connected in series, and, the
One branch；
Zener diode ZD2, resistance R34 and diode Q4 have been sequentially connected in series in the first branch；
The resistance R31 is connected to the sides power supply capacitor C1；
The zener diode ZD2 is connected between the resistance R32 and R33；
The collector of the diode Q4 is connect with the input terminal of the push-pull circuit.
Further, the voltage surge protection circuit further includes：It is separately connected the surge detection circuit and the confession
The surge notification circuit of electric capacitive detection circuit, and the surge notification circuit is equipped with one-chip machine port INT；
The surge notification circuit is used to, when the voltage of the power supply capacitor C1 is more than predetermined threshold value, increase the monolithic
Generator terminal mouth INT voltages so that the microcontroller for being connected to the one-chip machine port INT stops power output and removes current operation
Flag bit, and control power output again after a predetermined time elapses；
Wherein, the microcontroller is arranged with aimed semiconductor power component in same electromagnetic heater.
Further, the surge notification circuit includes：
Capacitance C21, resistance R21, R22 and the R23 being sequentially connected in series, and, the second branch；
Resistance R24, zener diode ZD1 and the one-chip machine port INT have been sequentially connected in series in the second branch；
The resistance R21 is connected to the sides power supply capacitor C1；
The resistance R22 is in parallel with capacitance C21；
The resistance R24 is connected between the resistance R22 and R23；
The one-chip machine port INT is connect with the surge detection circuit.
Further, the surge detection circuit is positive surge detection circuit；
The forward direction surge detection circuit is for the direct impulse wave in the line voltage after detecting rectified circuit rectifies
It gushes.
Further, the positive surge detection circuit includes：
Capacitance C11 and C12, resistance R14, and, resistance R11, R12 and the R13 being sequentially connected in series；
The resistance R11 is connected to the rectification circuit；
The capacitance C11 is in parallel with resistance R12；
The primary side of the resistance R14 is connected between the resistance R12 and R13；
Secondary sides of the capacitance C12 in the resistance R14 is in parallel with the R13.
Further, the rectification circuit is bridge rectifier.
Further, the aimed semiconductor power component is the IGBT of electromagnetic heater.
Second aspect, the utility model provide a kind of electromagnetic heater, are equipped in the electromagnetic heater described
Voltage surge protection circuit.
As shown from the above technical solution, a kind of voltage surge protection circuit provided by the utility model and electromagnetic heating dress
It sets, which includes：Sequentially connected rectification circuit and aimed semiconductor power component, and, and it is described
The surge detection circuit 3 of rectification circuit connection, the voltage surge protection circuit further include：With aimed semiconductor power member
The power supply capacitor C1 of part connection, and, it is connected to the power supply capacitor detection circuit of the power supply capacitor C1；The power supply capacitor inspection
Slowdown monitoring circuit is used to, when detection knows that the voltage of the power supply capacitor C1 is more than predetermined threshold value, trigger the surge detection circuit,
And it controls the aimed semiconductor power component and is switched on or off；The time of negative sense surging signal can reliably and accurately be avoided
Extend and caused by damage of the voltage surge to power semiconductor component, effectively improve the safety in operation of power semiconductor component
And service life, power semiconductor component can be controlled in advance before surge top is arrived and be switched on or off, avoid generating wound
The high back-pressure of evil property, and then improve safety in operation and the operation longevity of electromagnetic heater of the band equipped with power semiconductor component
Life improves user experience.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is this
Some embodiments of utility model, for those of ordinary skill in the art, without creative efforts, also
It can be obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of voltage surge protection circuit in the utility model embodiment one；
Fig. 2 be the utility model voltage surge protection circuit in surge detection circuit 3 structural schematic diagram；
Fig. 3 is the structural schematic diagram of the voltage surge protection circuit including push-pull circuit 5 of the utility model；
Fig. 4 be the utility model voltage surge protection circuit in power supply capacitor detection circuit 4 structural schematic diagram；
Fig. 5 be the utility model voltage surge protection circuit in push-pull circuit 5 structural schematic diagram；
Fig. 6 is the structural schematic diagram of the voltage surge protection circuit including surge notification circuit 6 of the utility model；
Fig. 7 be the utility model voltage surge protection circuit in surge notification circuit 6 structural schematic diagram；
Fig. 8 is the structural schematic diagram of the voltage surge protection circuit in the application example of the utility model；
Fig. 9 is a kind of flow structure schematic diagram of voltage surge guard method in the utility model embodiment two；
Wherein, 1- rectification circuits；2- aimed semiconductor power components；3- surge detection circuits；4- power supply capacitors detection electricity
Road；5- push-pull circuits；6- surge notification circuits.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment carries out clear, complete description, it is clear that retouched to the technical scheme in the embodiment of the utility model
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts belong to
The range of the utility model protection.
For the problems of the prior art, a kind of voltage surge protection circuit of the utility model offer and electromagnetic heating dress
It sets.It is understood that the voltage surge protection circuit described in the utility model embodiment is suitable for various electromagnetic heaters,
Electromagnetic heater therein especially electromagnetic oven, insulating pot etc. are also applied for cookware and are integrally disposed in one with heating equipment
Cooking apparatus in entirety, such as electric frying pan etc.；In the operating status of power semiconductor component, the electricity of power semiconductor component
Signal is pressed, resonance is carried out with shutdown according to opening for power semiconductor component, during power semiconductor component turns off, is supplied
The storage energy affect for flowing through coil panel of capacitance, 5uf voltages are bigger, and IGBT service times are longer, and drum energy storage is more,
IGBT collector back-pressures are higher；Power supply capacitor energy storage signal therein releases energy in IGBT shutdown devices, when IGBT is opened
Between store energy, sawtooth like wave charge-discharge energy is presented, unidirectional surge mouth voltage signal becomes with the input size of line voltage
Change and change, when generating positive surge, absolute voltage is more than reference voltage, triggers energizing signal, but arrive it in positive surge
Before, negative sense surge was produced before this, and corresponding more with the foundation of negative sense surging signal, surge mouth voltage will be pulled to very low
Level, then again as positive surging signal is risen, triggering surging signal overturning.However, it was found that really triggering surge
Signal, before stopping power, resonance is to very high voltage by IGBT, in other words, surging signal triggering be
After IGBT collector highest signals, 6~7 harmonic periods of entire surge reaction time delay, it is therefore desirable to apply this reality
It is solved the above problems with novel voltage surge protection circuit；The voltage surge protection circuit of the utility model includes connecting successively
The rectification circuit and aimed semiconductor power component connect, and, the surge detection circuit being connect with the rectification circuit is and described
The power supply capacitor of aimed semiconductor power component parallel connection, and, it is connected to the power supply capacitor detection circuit of the power supply capacitor；Institute
When stating power supply capacitor detection circuit for knowing that the voltage of the power supply capacitor is more than predetermined threshold value in detection, the surge is triggered
Detection circuit, and control the aimed semiconductor power component shutdown；Negative sense surging signal can reliably and accurately be avoided
Time lengthening and caused by damage of the voltage surge to power semiconductor component, effectively improve power semiconductor component operation peace
Full property and service life can control power semiconductor component in advance before surge top is arrived and be switched on or off, avoid producing
The high back-pressure of raw nocuity, and then improve service life, intelligence that band is equipped with the electromagnetic heater 8 of power semiconductor component
Change degree and application security, so that user experience improves.It below will be by first to 3rd embodiment to the utility model
Explanation is explained in detail.
The embodiments of the present invention one provide a kind of specific implementation mode of voltage surge protection circuit, referring to Fig. 1, institute
It states voltage surge protection circuit and specifically includes following content：
Sequentially connected rectification circuit 1 and aimed semiconductor power component 2, and, the wave being connect with the rectification circuit 1
Detection circuit 3 is gushed, the power supply capacitor C1 being connect with the aimed semiconductor power component 2, and, it is connected to the power supply capacitor
The power supply capacitor detection circuit 4 of C1；The power supply capacitor detection circuit 4 is used to know in detection the voltage of the power supply capacitor C1
When more than predetermined threshold value, the surge detection circuit 3 is triggered, and controls the aimed semiconductor power component 2 and is switched on or off.
In the foregoing description, the rectification circuit 1 is bridge rectifier, is responsible for electric main being converted to direct current city
Electricity；The aimed semiconductor power component 2 be used for transformation of electrical energy and electrical energy control circuit in it is high-power (be often referred to electric current be number
Ten to thousands of peaces, and voltage is hundreds of volts or more) electronic device, and half control type device, wholly-controled device and uncontrollable can be divided into
Type device, wherein thyristor are half control type device, bear voltage and current capacity highest in all devices；Power Diode Pumped is
Uncontrollable device, structure and principle are simple, reliable operation；It is further divided into voltage driven type device and current drive-type device,
Wherein GTO, GTR are current drive-type device, and IGBT, power MOSFET are voltage driven type device；The surge detection circuit 3
Pulse surge for detecting line voltage after 1 rectification of rectified circuit, and the input terminal of surge detection circuit 2 and the rectification
Circuit 1 connects, and in the present embodiment, is carried out so that the aimed semiconductor power component 2 is the IGBT of electromagnetic heater 8 as an example
Explanation.
It is understood that the power supply capacitor detection circuit 4 detects the voltage of the power supply capacitor C1, and described in judgement
Whether the voltage of power supply capacitor C1 is more than predetermined threshold value；If so, triggering the surge detection circuit 3, and control the electromagnetism
Aimed semiconductor power component 2 in heating device 8 is switched on or off.
In a kind of concrete example of the surge detection circuit 3, referring to Fig. 2, the surge detection circuit 3 is positive wave
Gush detection circuit 31；And the positive surge detection circuit 31 is in the line voltage after detecting 1 rectification of rectified circuit
Direct impulse surge；The forward direction surge detection circuit 31 specifically includes following content：Capacitance C11 and C12, resistance R14, with
And resistance R11, R12 and R13 being sequentially connected in series；The resistance R11 is connected to the rectification circuit 1；The capacitance C11 and electricity
It is in parallel to hinder R12；The primary side of the resistance R14 is connected between the resistance R12 and R13；The capacitance C12 is in the resistance
The secondary side of R14 is in parallel with the R13.
As can be seen from the above description, the voltage surge protection circuit that the embodiments of the present invention provide, can be reliable and accurate
Really avoid the time lengthening of negative sense surging signal and caused by damage of the voltage surge to power semiconductor component, effectively improve
The safety in operation and service life of power semiconductor component.
In a specific embodiment, it referring to Fig. 3, is additionally provided with and recommends in the voltage surge protection circuit of the utility model
Circuit 5, and PPG programme pulse generator PPG is connected on the push-pull circuit 5, wherein the PPG programme pulse generator PPG and mesh
Power semiconductor component 2 is marked to be arranged in same electromagnetic heater 8；The output end of the push-pull circuit 5 and the target half
Conductor power component 2 connects, and the input terminal of the push-pull circuit 5 is connect with the power supply capacitor detection circuit 4；It is corresponding,
The power supply capacitor detection circuit 4 is also recommended described in control when controlling the aimed semiconductor power component 2 and being switched on or off
Circuit 5 closes the PPG programme pulse generator PPG.
In the foregoing description, referring to Fig. 4, the power supply capacitor detection circuit 4 includes：Resistance R31, the R32 being sequentially connected in series
And R33, and, the first branch；Zener diode ZD2, resistance R34 and diode Q4 have been sequentially connected in series in the first branch；
The resistance R31 is connected to the sides power supply capacitor C1；The zener diode ZD2 is connected between the resistance R32 and R33；Institute
The collector for stating diode Q4 is connect with the input terminal of the push-pull circuit 5.
In the concrete example of the push-pull circuit 5, the push-pull circuit 5 can be arranged as shown in Figure 5, recommend electricity at this
In road 5, including diode Q1, Q2 and Q3, and the emitting stage E of the aimed semiconductor power component 2 and diode Q2 connects
It connects, the emitting stage E of the emitting stage E and diode Q3 of the diode Q2 are connected, the base stage B connections described two of the diode Q2
The base stage B of the collector C, the diode Q1 of pole pipe Q1 are connected to the PPG programme pulse generator PPG, and the diode Q1
The sides collector C be connected with resistance R1, the diode Q3 base stage B be the push-pull circuit 5 input terminal, it is described to recommend electricity
The input terminal on road 5 is connect with the power supply capacitor detection circuit 4.
As can be seen from the above description, the voltage surge protection circuit that the embodiments of the present invention provide, can be in target half
The collector of conductor power component 2 closes PPG programme pulse generator PPG signals, playing prevents because before resonance generation high pressure
The protective effect of voltage surge.
In a specific embodiment, referring to Fig. 6, difference is additionally provided in the voltage surge protection circuit of the utility model
Connect the surge notification circuit 6 of the surge detection circuit 3 and the power supply capacitor detection circuit 4, and surge notification electricity
Road 6 is equipped with one-chip machine port INT；The surge notification circuit 6 is used to be more than default threshold in the voltage of the power supply capacitor C1
When value, the one-chip machine port INT voltages are increased so that the stopping power of microcontroller 7 for being connected to the one-chip machine port INT is defeated
Go out and remove current operation flag position, and controls power output again after a predetermined time elapses；Wherein, the microcontroller
7 are arranged with aimed semiconductor power component 2 in same electromagnetic heater 8.
In the foregoing description, referring to Fig. 7, the surge notification circuit 6 specifically includes：
Capacitance C21, resistance R21, R22 and the R23 being sequentially connected in series, and, the second branch；It is gone here and there successively in the second branch
It is associated with resistance R24, zener diode ZD1 and the one-chip machine port INT；The resistance R21 is connected to the sides power supply capacitor C1；Institute
It is in parallel with capacitance C21 to state resistance R22；The resistance R24 is connected between the resistance R22 and R23；The one-chip machine port
INT is connect with the surge detection circuit 3.
As can be seen from the above description, the voltage surge protection circuit that the embodiments of the present invention provide, can be reliable and accurate
Really avoid the time lengthening of negative sense surging signal and caused by damage of the voltage surge to power semiconductor component, effectively improve
The safety in operation and service life of power semiconductor component can control semiconductor power in advance before surge top is arrived
Element ON or shutdown avoid the high back-pressure for generating nocuity, and then improve electromagnetism of the band equipped with power semiconductor component and add
The safety in operation and service life of thermal improve user experience.
For further instruction this programme, the utility model also provides a kind of application example of voltage surge protection circuit,
Referring to Fig. 8, the voltage surge protection circuit specifically includes following content：
By detecting the absolute voltage of 5 μ F of power supply capacitor, to control switch and the shutdown of IGBT, while surge protection is triggered
Mechanism.PPG is closed in advance before top is arrived, and avoids generating very high back-pressure；Surge protection mechanism is triggered simultaneously, removing has
Pot flag bit, inspection pot heating again after waiting for 3 seconds, avoids high-order open-minded.
Circuit design is divided into three modules：
1：The positive surge detection circuit being made of R11~R14 and C11~C12.This circuit be also at present
Positive surge detection circuit.
But have a problem that, when generating negative sense surge, surge mouth voltage, that is, C12 voltage-to-grounds can be reduced first,
Then the positive surge being generated again improves, trigger voltage surge mechanism.There are problems that the delay protection above stated.
2：It is added to 5uF voltage detectings all the way and acts on IGBT drive circuit, managed by resistance R31~R34, ZD2 and NPN
Q4 is formed.
Wherein resistance R31~R33 forms one group of bleeder circuit, and ZD2 is zener diode, is to be turned up provided with ZD2
Dividing ratios are divided, adjusting is facilitated.The collector of triode Q4 is connected with IGBT push-pull circuit input terminals.Basic functional principle,
When 5uF voltages rise to certain voltage, load R33 voltages are more than the sum of ZD2 and triode BE voltages, thus by push-pull circuit
Low level is moved in input terminal pressure to.Forbid IGBT open-minded, plays the role of protecting at the first time.
3：Simultaneously provided with surging signal announcing circuit all the way.Even if because above-mentioned protection circuit carries out at the first moment
Protection, then 5uF voltages will maintain the high position of certain time, then slowly electric discharge, whole process will close to 800ms to 1S,
IGBT will be released at this time to force to close the limitation of section.But at this time since heating mark is removed not yet, the IGBT to lift restrictions
High-level heating will be carried out with larger width of opening, noise is very big and will produce larger leading voltage.
Physical circuit operation principle is as follows：R21~R24, C21 and ZD1 form surge notification circuit, as voltage raising, C21
Maintain two polygonal voltages constant, the voltage of R23 increases, more than ZD1 voltages.INT port voltages are drawn high to microcontroller, microcontroller carries out
Command response is dynamic, stops output power three seconds, and removes inspection pot flag bit.
As can be seen from the above description, the voltage surge protection circuit of the application example of the utility model, by detecting power supply electricity
Hold the voltage jump situation of C1, monitoring directly acts on the voltage value of IGBT resonant energies, in IGBT collectors because resonance generates
Before high pressure, PPG signals are closed, protection is played the role of.
The embodiments of the present invention two provide the application voltage surge protection side that above-mentioned voltage surge protection circuit is realized
The specific implementation mode of method, referring to Fig. 9, the voltage surge guard method specifically includes following content：
Step 100：The power supply capacitor detection circuit detects the voltage of the power supply capacitor C1；
Step 200：Judge whether the voltage of the power supply capacitor C1 is more than predetermined threshold value；
If so, entering step 300；Otherwise return to step 100 persistently detects.
Step 300：The power supply capacitor detection circuit triggers the surge detection circuit, and controls the electromagnetic heating dress
Aimed semiconductor power component in setting is switched on or off.
In a specific embodiment, the step 300 can specifically be further extended to step 301：
Step 301：The power supply capacitor detection circuit triggers the surge detection circuit, and controls the electromagnetic heating dress
Aimed semiconductor power component in setting is switched on or off, and is also controlled the push-pull circuit and is closed in the electromagnetic heater
PPG programme pulse generator PPG.
In a specific embodiment, the voltage surge guard method further includes：
After judging that the voltage of the power supply capacitor C1 is more than predetermined threshold value in step 200, step 400 is executed；
Step 400：The surge notification circuit increases the one-chip machine port INT voltages so that is connected to the monolithic
Microcontroller in the electromagnetic heater of generator terminal mouth INT stops power output and removes current operation flag position, and is passing through
Again power output is controlled after spending the predetermined time.
As can be seen from the above description, the voltage surge guard method that the embodiments of the present invention provide, can be reliable and accurate
Really avoid the time lengthening of negative sense surging signal and caused by damage of the voltage surge to power semiconductor component, effectively improve
The safety in operation and service life of power semiconductor component can control semiconductor power in advance before surge top is arrived
Element ON or shutdown avoid the high back-pressure for generating nocuity, and then improve electromagnetism of the band equipped with power semiconductor component and add
The safety in operation and service life of thermal improve user experience.
The embodiments of the present invention three provide a kind of specific implementation mode of electromagnetic heater, the electromagnetic heating dress
It sets and specifically includes following content：Voltage surge protection circuit in the utility model embodiment one；The power supply capacitor detection electricity
Detect the voltage of the power supply capacitor C1 in road；Judge whether the voltage of the power supply capacitor C1 is more than predetermined threshold value；If so, institute
It states power supply capacitor detection circuit and triggers the surge detection circuit, and control the IGBT in the electromagnetic heater and open or close
It is disconnected, the PPG programme pulse generator PPG that the push-pull circuit is closed in the electromagnetic heater is also controlled, and, the surge
Announcing circuit increases the one-chip machine port INT voltages so that is connected in the electromagnetic heater of the one-chip machine port INT
Microcontroller stop power output and remove current operation flag position, and control power is defeated again after a predetermined time elapses
Go out.
As can be seen from the above description, the electromagnetic heater that the embodiments of the present invention provide, can be reliably and accurately
Avoid the time lengthening of negative sense surging signal and caused by damage of the voltage surge to power semiconductor component, effectively improve and partly lead
The safety in operation and service life of body power component can control power semiconductor component in advance before surge top is arrived
It is switched on or off, avoids the high back-pressure for generating nocuity, and then improve the electromagnetic heating dress that band is equipped with power semiconductor component
The safety in operation and service life set improve user experience.
In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term "upper", "lower"
To be based on the orientation or positional relationship shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, without referring to
Show or imply that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore cannot manage
Solution is limitations of the present invention.Unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should be done
It broadly understood, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；Can be mechanical connection,
It can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary inside two elements
Connection.For the ordinary skill in the art, above-mentioned term can be understood as the case may be in the present invention
Concrete meaning.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Above example is merely to illustrate the technical solution of the utility model, rather than its limitations；Although with reference to aforementioned reality
Example is applied the utility model is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modifications or substitutions, the spirit and model of various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (10)
1. a kind of voltage surge protection circuit, including sequentially connected rectification circuit (1) and aimed semiconductor power component (2),
And the surge detection circuit (3) being connect with the rectification circuit (1), which is characterized in that the voltage surge protection circuit is also
Including：The power supply capacitor C1 being connect with the aimed semiconductor power component (2), and, it is connected to the power supply capacitor C1's
Power supply capacitor detection circuit (4)；
The power supply capacitor detection circuit (4) is used to, when the voltage for detecting the power supply capacitor C1 is more than predetermined threshold value, touch
It sends out surge detection circuit (3) described, and controls the aimed semiconductor power component (2) and be switched on or off.
2. voltage surge protection circuit according to claim 1, which is characterized in that the voltage surge protection circuit is also wrapped
It includes：Push-pull circuit (5), and it is connected with PPG programme pulse generator PPG on the push-pull circuit (5), wherein the pulse protocol hair
Raw device PPG is arranged with aimed semiconductor power component (2) in same electromagnetic heater；
The output end of the push-pull circuit (5) is connect with the aimed semiconductor power component (2), the push-pull circuit (5)
Input terminal is connect with the power supply capacitor detection circuit (4)；
Corresponding, the power supply capacitor detection circuit (4) is switched on or off in the control aimed semiconductor power component (2)
When, it also controls the push-pull circuit (5) and closes the PPG programme pulse generator PPG.
3. voltage surge protection circuit according to claim 2, which is characterized in that the power supply capacitor detection circuit (4)
Including：Resistance R31, R32 and the R33 being sequentially connected in series, and, the first branch；
Zener diode ZD2, resistance R34 and diode Q4 have been sequentially connected in series in the first branch；
The resistance R31 is connected to the sides power supply capacitor C1；
The zener diode ZD2 is connected between the resistance R32 and R33；
The collector of the diode Q4 is connect with the input terminal of the push-pull circuit (5).
4. voltage surge protection circuit according to claim 1, which is characterized in that the voltage surge protection circuit is also wrapped
It includes：It is separately connected the surge notification circuit (6) of the surge detection circuit (3) and the power supply capacitor detection circuit (4), and institute
It states surge notification circuit (6) and is equipped with one-chip machine port INT；
The surge notification circuit (6) is used to, when the voltage of the power supply capacitor C1 is more than predetermined threshold value, increase the monolithic
Generator terminal mouth INT voltages so that the microcontroller (7) for being connected to the one-chip machine port INT stops power output and removes currently
Operation flag position, and control power output again after a predetermined time elapses；
Wherein, the microcontroller (7) is arranged with aimed semiconductor power component (2) in same electromagnetic heater.
5. voltage surge protection circuit according to claim 4, which is characterized in that the surge notification circuit (6) includes：
Capacitance C21, resistance R21, R22 and the R23 being sequentially connected in series, and, the second branch；
Resistance R24, zener diode ZD1 and the one-chip machine port INT have been sequentially connected in series in the second branch；
The resistance R21 is connected to the sides power supply capacitor C1；
The resistance R22 is in parallel with capacitance C21；
The resistance R24 is connected between the resistance R22 and R23；
The one-chip machine port INT is connect with the surge detection circuit (3).
6. voltage surge protection circuit according to claim 1, which is characterized in that the surge detection circuit (3) is just
To surge detection circuit (31)；
The forward direction surge detection circuit (31) is used to detect the direct impulse in the line voltage after rectified circuit (1) rectification
Surge.
7. voltage surge protection circuit according to claim 6, which is characterized in that the forward direction surge detection circuit (31)
Including：
Capacitance C11 and C12, resistance R14, and, resistance R11, R12 and the R13 being sequentially connected in series；
The resistance R11 is connected to the rectification circuit (1)；
The capacitance C11 is in parallel with resistance R12；
The primary side of the resistance R14 is connected between the resistance R12 and R13；
Secondary sides of the capacitance C12 in the resistance R14 is in parallel with the R13.
8. voltage surge protection circuit according to any one of claims 1 to 7, which is characterized in that the rectification circuit (1) is
Bridge rectifier.
9. voltage surge protection circuit according to any one of claims 1 to 7, which is characterized in that the aimed semiconductor work(
Rate element (2) is the IGBT of electromagnetic heater.
10. a kind of electromagnetic heater, which is characterized in that be equipped with such as any one of claim 1 to 9 in the electromagnetic heater
The voltage surge protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820609095.0U CN208046582U (en) | 2018-04-26 | 2018-04-26 | Voltage surge protection circuit and electromagnetic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820609095.0U CN208046582U (en) | 2018-04-26 | 2018-04-26 | Voltage surge protection circuit and electromagnetic heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208046582U true CN208046582U (en) | 2018-11-02 |
Family
ID=63928360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820609095.0U Active CN208046582U (en) | 2018-04-26 | 2018-04-26 | Voltage surge protection circuit and electromagnetic heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208046582U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417385A (en) * | 2018-04-26 | 2019-11-05 | 佛山市顺德区美的电热电器制造有限公司 | Voltage surge protection circuit and method, electromagnetic heater |
-
2018
- 2018-04-26 CN CN201820609095.0U patent/CN208046582U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417385A (en) * | 2018-04-26 | 2019-11-05 | 佛山市顺德区美的电热电器制造有限公司 | Voltage surge protection circuit and method, electromagnetic heater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102142833B (en) | Silicon controlled trigger circuit | |
| CN104539141B (en) | Switching Power Supply dipulse pulsewidth limiting circuit and its implementation | |
| CN204442725U (en) | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear | |
| CN102781130B (en) | Large-power electromagnetic cooker circuit based on power electronic technology | |
| CN100578901C (en) | Current source coupled type high voltage thyristor valve group triggering unit | |
| CN208046582U (en) | Voltage surge protection circuit and electromagnetic heater | |
| CN104595557A (en) | Resistance-capacitance voltage reduction type power-saving and noise-reducing alternating current electromagnetic valve | |
| CN105485731A (en) | Microwave oven circuit and microwave oven | |
| CN101227139A (en) | Apparatus and method for controlling bidirectional thyristor | |
| CN201985519U (en) | Capacitive pulse-discharging device and capacitive fling-cut switch | |
| CN102332713B (en) | Method for anti-surge circuit for electromagnetic induction heating appliance | |
| CN102447406A (en) | Alternating current (AC)/direct current (DC) converter | |
| CN105517219A (en) | Control method and device of microwave oven circuit and microwave oven | |
| CN103904871B (en) | The control method of high-frequency heating power switching tube protection circuit | |
| CN110417385A (en) | Voltage surge protection circuit and method, electromagnetic heater | |
| CN105207515A (en) | Repetition frequency pulse power current source | |
| CN107528289B (en) | Electromagnetic heating system and protection device thereof | |
| CN208094825U (en) | heating circuit and induction cooker | |
| CN104613219A (en) | Double-threshold-value type power-saving silencing AC electromagnetic valve | |
| CN107172733A (en) | A kind of electromagnetic heating system and its method of work | |
| CN200953667Y (en) | Electromagnetic oven with automatic high voltage and frequency controlled power tube | |
| CN201928186U (en) | Sliding frequency soft startup circuit applied to electromagnetic induction heating power supply | |
| CN102611090A (en) | Capacitance pulse discharging device and capacitance fling-cut switch | |
| CN202111886U (en) | Induction cooker with IGBT (insulated gate bipolar transistor) overvoltage protection function | |
| CN204598427U (en) | A kind of Unisolated switch power circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |