CN205490469U - IGBT drive signal's pulse width limiting circuit and electromagnetic heating device - Google Patents
IGBT drive signal's pulse width limiting circuit and electromagnetic heating device Download PDFInfo
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- CN205490469U CN205490469U CN201620097414.5U CN201620097414U CN205490469U CN 205490469 U CN205490469 U CN 205490469U CN 201620097414 U CN201620097414 U CN 201620097414U CN 205490469 U CN205490469 U CN 205490469U
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Abstract
The utility model discloses a IGBT drive signal's pulse width limiting circuit and electromagnetic heating device, this circuit include falling edge trigger circuit, when the IGBT drive signal of IGBT drive signal input circuit input is in the falling edge, and output falling edge pulse signal, time -delay control circuit receives falling edge pulse signal to carry out the energy storage and discharge, when discharge voltage is higher than the presupposition voltage value, export a control signal, when discharge voltage is less than the presupposition voltage value, export the 2nd control signal, analog switch circuit when receiving a control signal, controls its input and output disconnection, stops to export IGBT drive signal to IGBT, controls its input and output switch -on when receiving the 2nd control signal to export IGBT drive signal to IGBT. The utility model discloses the problem of having avoided IGBT to open during the high pressure in the LC oscillatory process and having damaged has improved the security that IGBT worked.
Description
Technical field
This utility model relates to electric-heating technology field, particularly relates to a kind of IGBT and drives the pulsewidth limit of signal
Circuit processed and electromagnetic heater.
Background technology
IGBT is a kind of switching device for high voltage control.In LC oscillating circuit, the current collection of IGBT
Pole is connected with LC, the grounded emitter of IGBT, and the grid of IGBT is connected with drive circuit.
When LC is energized, produce vibration due to the mutual discharge and recharge of LC, make LC voltage high pressure and low pressure it
Between back and forth switch.Wherein, by drive circuit output IGBT drive signal, control IGBT open accordingly or
Person closes, and to avoid LC voltage to be in balance, and stops oscillation.
When drive circuit output high level signal, IGBT opens, and controls LC oscillating circuit and discharges over the ground,
Realizing resetting, now, the current potential of IGBT colelctor electrode is in low-voltage.
When drive circuit output low level signal, IGBT closes, and LC starts discharge and recharge, during this
LC voltage toggles between high pressure conditions and low-pressure state, and accordingly, the collector potential of IGBT exists
Toggle between high pressure conditions and low-pressure state, if opening IGBT during LC high pressure, it is likely that
Because its collector voltage is too high, and IGBT is caused damage.
Utility model content
Main purpose of the present utility model is the pulsewidth limiting circuit providing a kind of IGBT to drive signal, purport
The problem avoiding IGBT to open during being in high pressure in LC oscillatory process and to damage, improves IGBT work
The safety made.
For achieving the above object, the utility model proposes a kind of IGBT and drive the pulsewidth limiting circuit of signal,
This IGBT drives the pulsewidth limiting circuit of signal to include, and trailing edge triggers circuit, delay control circuit, simulation
On-off circuit, described trailing edge triggers the input of circuit and drives the defeated of signal input circuit with described IGBT
Going out end to connect, described trailing edge triggers the outfan of circuit and is connected with the input of described delay control circuit,
The outfan of described delay control circuit is connected with the controlled end of described analog switching circuit, and described simulation is opened
The input closing circuit drives the outfan of signal input circuit to be connected with described IGBT, described analog switch
The outfan of circuit is connected with the driven moved end of IGBT；
Described trailing edge triggers circuit, for driving the IGBT of signal input circuit input at described IGBT
When driving signal to be in trailing edge, export trailing edge pulse signal；
Described delay control circuit, is used for receiving described trailing edge pulse signal, and carries out energy storage and electric discharge,
When discharge voltage is higher than preset voltage value, export the first control signal, at discharge voltage less than described pre-
If during magnitude of voltage, export the second control signal；
Described analog switching circuit, for when receiving described first control signal, controls its input
Disconnect with outfan, stop driving signal to export to IGBT described IGBT, receiving described second
Control its input during control signal to connect with outfan, to drive signal to export extremely described IGBT
IGBT。
Preferably, described trailing edge triggers circuit and includes trailing edge detection module, switching output module and steady
Die block, the test side of described trailing edge detection module is the input that described trailing edge triggers circuit, institute
The controlled end of the outfan and described switching output module of stating trailing edge detection module is connected, and described switch is defeated
The input of the outfan and described Voltage stabilizing module that go out module is connected, and the outfan of described Voltage stabilizing module is institute
State trailing edge and trigger the outfan of circuit；
Wherein, described trailing edge detection module, for detecting that described IGBT drives signal input circuit
When the IGBT of input drives signal to be in trailing edge, control described switching output module and open；
Described switching output module, for when opening, exporting the first voltage signal；
Described Voltage stabilizing module, the amplitude of the first voltage signal for exporting described switching output module is entered
Row limits, to export described trailing edge pulse signal.
Preferably, described trailing edge detection module include the first diode, the first resistance, the second resistance,
First electric capacity and the first comparator；The anode of described first diode is the inspection of described trailing edge detection module
Surveying end, the negative electrode of described first diode is connected with the first end of described first resistance, described first resistance
The second end respectively with the first end of described second resistance, the first end of described first electric capacity and described first
The positive input of comparator connects, the second end of described second resistance and the second end of described first electric capacity
Ground connection；The reverse input end of described first comparator inputs the first voltage reference signal, and described first compares
The outfan of device is the outfan of described trailing edge detection module.
Preferably, described switching output module includes the first switching tube, the 3rd resistance, the 4th resistance and
One power supply, the emitter stage of described first switching tube is through described 3rd resistance and described first power supply
Connecting, one end that the emitter stage of described first switching tube is connected with described 3rd resistance is described switch output
The controlled end of module, the colelctor electrode of described first switching tube is connected with one end of described 4th resistance, described
Second end ground connection of the 4th resistance, described first switching tube is described with one end of described 4th resistive interconnections
The outfan of switching output module, the base stage of described first switching tube and described IGBT drive signal input electricity
The outfan on road connects.
Preferably, described Voltage stabilizing module includes clamp supply, the second diode and the 3rd diode, described
The anode of the second diode is the input of described Voltage stabilizing module, and the negative electrode of described second diode is with described
The anode of the 3rd diode connects, and the negative electrode of described 3rd diode is connected with described clamp supply, described
The outfan that one end is described Voltage stabilizing module that second diode interconnects with described 3rd diode.
Preferably, described IGBT drives signal input circuit to include driving the letter of signal for inputting IGBT
Number input, the 5th resistance and stabilivolt, the first end of described 5th resistance is with described signal input part even
Connect, the second end of described 5th resistance and the negative electrode of described stabilivolt, the base stage of described first switching tube and
First end of described first resistance connects respectively, the plus earth of described stabilivolt；Described 5th resistance
Second end is the outfan that IGBT drives signal input circuit with one end of the negative electrode interconnection of described stabilivolt.
Preferably, described delay control circuit includes charge-discharge modules and comparison module, described discharge and recharge mould
The input of block is the input of delay control circuit, and the outfan of described charge-discharge modules compares with described
The positive input of module connects；The reverse input end of described comparison module inputs the second reference voltage signal,
The outfan of described comparison module is the outfan of described delay control circuit.
Preferably, described charge-discharge modules includes described 8th resistance and second electric capacity of parallel connection, and string
9th resistance of connection and the 3rd electric capacity, described 8th resistance and one of them public connecting end of the second electric capacity
For the input of described charge-discharge modules, and connect with the end that is freely connected of described 9th resistance, described the
Another public connecting end of eight resistance and the second electric capacity and the end that freely connects of described 3rd electric capacity connect simultaneously
Ground, described 9th resistance and the outfan that public connecting end is described charge-discharge modules of described 3rd electric capacity.
Preferably, described comparison module includes the second power supply, the second comparator, is connected on described
The tenth resistance between two power supplies and ground connection and the 11st resistance, and it is connected to described second power supply
The 12nd resistance between power supply and the second comparator output terminal；Described tenth resistance and the 11st resistance it
Between public connecting end input the second reference voltage signal to the reverse input end of described comparison module；Described
The positive input of the second comparator is the positive input of described comparison module, described second comparator
Outfan is the outfan of described comparison module.
Preferably, described analog switching circuit includes the 3rd power supply, simulant electronic switch and the 13rd
Resistance, described simulant electronic switch includes supply pin, the first input pin, the first output pin, controls first
The first controlled foot and the grounding leg connecting between input pin and the first output pin or cutting off, described simulation electricity
The supply pin of son switch is connected with described 3rd power supply, and the first end of described 13rd resistance is with described
First input pin of simulant electronic switch connects, and the second end of described 13rd resistance is described analog switch
The input of circuit, the output that the first output pin is described analog switching circuit of described simulant electronic switch
End, the controlled end that the first controlled foot is described analog switching circuit of described simulant electronic switch, described mould
Intend the grounding leg ground connection of electrical switch.
This utility model also provides for a kind of electromagnetic heater, and this electromagnetic heater includes as above
IGBT drives the pulsewidth limiting circuit of signal, and this IGBT drives the pulsewidth limiting circuit of signal to include declining
Along triggering circuit, delay control circuit, analog switching circuit, described trailing edge triggers the input of circuit
The outfan driving signal input circuit with described IGBT is connected, and described trailing edge triggers the outfan of circuit
It is connected with the input of described delay control circuit, the outfan of described delay control circuit and described simulation
The controlled end of on-off circuit connects, and the input of described analog switching circuit and described IGBT drive signal defeated
The outfan entering circuit connects, and the outfan of described analog switching circuit is connected with the driven moved end of IGBT；
Described trailing edge triggers circuit, for driving the IGBT of signal input circuit input to drive at described IGBT
When signal is in trailing edge, export trailing edge pulse signal；Described delay control circuit, is used for receiving institute
State trailing edge pulse signal, and carry out energy storage and electric discharge, when discharge voltage is higher than preset voltage value, defeated
Go out the first control signal, when discharge voltage is less than described preset voltage value, export the second control signal；
Described analog switching circuit, for when receiving described first control signal, controls its input with defeated
Go out end to disconnect, stop described IGBT drives signal output to IGBT, control receiving described second
Control its input during signal to connect with outfan, to drive signal to export to IGBT described IGBT.
This utility model triggers circuit by trailing edge and determines that IGBT drives the time started of signal trailing edge,
And when IGBT drives the IGBT of signal input circuit input to drive signal to be in trailing edge, pass through time delay
Energy storage and the discharge process of control circuit carry out delays time to control to it, to increase driving signal low-level pulse width
The control time, ensure that LC is entered behind low pressure interval by high pressure interval in oscillatory process with this, just control
The IGBT of low-level pulse width is driven signal to export to IGBT by analog switching circuit, it is ensured that IGBT does not exists
LC oscillating circuit is opened during being in high pressure and is damaged, thus improves the safety of IGBT work.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that,
Accompanying drawing in describing below is only embodiments more of the present utility model, for ordinary skill people
From the point of view of Yuan, on the premise of not paying creative work, it is also possible to obtain according to the structure shown in these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is the circuit block diagram that this utility model IGBT drives the pulsewidth limiting circuit preferred embodiment of signal；
Fig. 2 is the electrical block diagram that the IGBT shown in Fig. 1 drives the pulsewidth limiting circuit of signal；
Fig. 3 is that the IGBT of input drives signal to drive signal input circuit and trailing edge detection module through IGBT
Waveform diagram after process；
Fig. 4 is through the signal waveform curve of the first switching tube output with through the second electric capacity, the 3rd capacitor charge and discharge
After signal waveform curve；
Fig. 5 is to the wavy curve after the second power supply dividing potential drop and warp through the tenth resistance and the 11st resistance
The signal waveform curve of the second comparator output；
Fig. 6 is wavy curve during IGBT driving signal input pulsewidth exception；
Fig. 7 be IGBT drive signal input pulsewidth normal time wavy curve；
Fig. 8 is that IGBT drives signal and IGBT oscillator signal to occur extremely and to the ripple after abnormal process
Shape comparison diagram.
Drawing reference numeral illustrates:
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings into
One step explanation.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment
Scheme is clearly and completely described, it is clear that described embodiment is only of the present utility model one
Section Example rather than whole embodiments.Based on the embodiment in this utility model, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise, broadly falls into
The scope of this utility model protection.
It is to be appreciated that directional instruction in this utility model embodiment (such as upper and lower, left and right,
It is forward and backward ...) it is only used for explanation phase under a certain particular pose (as shown in drawings) between each parts
To position relationship, motion conditions etc., if this particular pose changes, then directionality indicates also
Change the most therewith.
It addition, the description relating to " first ", " second " etc. in this utility model is only used for describing purpose, and
It is not intended that indicate or imply its relative importance or the implicit number indicating indicated technical characteristic
Amount.Thus, define " first ", the feature of " second " can express or implicitly include at least one should
Feature.It addition, the technical scheme between each embodiment can be combined with each other, but must be with ability
Based on territory those of ordinary skill is capable of, when the combination of technical scheme occurs conflicting or cannot be real
Will be understood that the combination of this technical scheme does not exists now, the protection model not required at this utility model
Within enclosing.
The utility model proposes a kind of IGBT and drive the pulsewidth limiting circuit of signal, for IGBT is driven
The low-level pulse width driving signal of circuit output carries out minimum interval restriction, to avoid IGBT to exist
Open during LC oscillatory process is in high pressure and damage.
With reference to Fig. 1 and Fig. 2, in this utility model embodiment, this IGBT drives the pulsewidth of signal to limit
Circuit includes that trailing edge triggers circuit 10, delay control circuit 20 and analog switching circuit 30.
Specifically, described trailing edge triggers input and the IGBT driving signal input circuit 5 of circuit 10
Outfan connect, described trailing edge triggers outfan and the described delay control circuit 20 of circuit 10
Input connects, and the outfan of described delay control circuit 20 is controlled with described analog switching circuit 30
End connects, and the input of described analog switching circuit 30 drives signal input circuit 5 with described IGBT
Outfan connects, and the outfan of described analog switching circuit 30 is connected with the driven moved end of IGBT.
In the present embodiment, IGBT drives signal input circuit 5 to be used for inputting IGBT and drives signal；Decline
Along triggering circuit 10 for driving the IGBT of signal input circuit 5 input to drive signal at described IGBT
When being in trailing edge, export trailing edge pulse signal；Delay control circuit 20 is used for receiving described trailing edge
Pulse signal, and carry out energy storage and electric discharge, when discharge voltage is higher than preset voltage value, output the first control
Signal processed, when discharge voltage is less than described preset voltage value, exports the second control signal；Analog switch
Circuit 30, for when receiving described first control signal, controls its input and disconnects with outfan, stop
Only drive signal to export to IGBT described IGBT, control it when receiving described second control signal
Input is connected with outfan, to drive signal to export to IGBT described IGBT.Wherein, time delay control
The discharge time of circuit 20 processed can be configured according to its electricity stored, i.e. can be suitable by selecting
The delay control circuit 20 of reserve of electricity determines the length of time t when it is discharged to preset voltage value, should
Discharge time, t was the control time that IGBT drives signal low-level pulse width.It should be appreciated that this time
T is for adding the t3 time, such as Fig. 3 institute on the basis of driving signal low-level pulse width t1 in original I GBT
Show.Wherein, this t3 time specifically can adjust putting of delay control circuit 20 by selecting suitable device
The electricity time is determined.During this time t3 is not in high pressure as protection IGBT in LC oscillatory process
The time opened and damage.In order to protect IGBT without damage, delay control circuit 20 is typically set and fills
Electricity to its discharge voltage is reduced to the time t of predeterminated voltage and is equal toShouldFor input L and C
Harmonic period.
When IGBT drives the IGBT of signal input circuit 5 input to drive signal to have just enter into trailing edge, no
Control IGBT conducting immediately, but it is carried out delays time to control, with at warp by delay control circuit 20
Cross after one section of guard time (time delay), it is ensured that it is interval that LC is entered low pressure by high pressure interval in oscillatory process
The rear analog switching circuit 30 that just controls is opened, and turns on IGBT, avoids IGBT at LC vibration electricity with this
Road is opened during being in high pressure and is damaged.And then when this driving signal controls analog switching circuit 30, protect
Card IGBT opens during not being in high pressure in LC oscillatory process and damages, thus improves IGBT work
The safety made.
In above-described embodiment, described IGBT drives signal input circuit to include for inputting IGBT driving letter
Number signal input part PWM-IN, the 5th resistance R5 and stabilivolt Z1, the of described 5th resistance R5
One end is connected with described signal input part PWM-IN, second end of described 5th resistance R5 with described surely
First end of the negative electrode of pressure pipe Z1, the base stage of described first switching tube Q1 and described first resistance R1 divides
Do not connect, the plus earth of described stabilivolt Z1；Second end of described 5th resistance R5 and described voltage stabilizing
One end of the negative electrode interconnection of pipe Z1 is the outfan that IGBT drives signal input circuit.Wherein, the 5th electricity
Resistance R5 and stabilivolt Z1 composition mu balanced circuit drives the IGBT of signal input circuit 5 input to IGBT
Signal is driven to carry out voltage stabilizing.The purpose of the present embodiment is the incoming level amplitude of the unified each circuit module of rear class.
In above-described embodiment, trailing edge triggers circuit 10 and the logic circuit arbitrarily realizing its function can be used real
Existing, in being preferable to carry out one, trailing edge triggers circuit 10 and includes trailing edge detection module 11, switch output
Module 12 and Voltage stabilizing module 13, the test side of described trailing edge detection module 11 is that described trailing edge triggers
The input of circuit 10, the outfan of described trailing edge detection module 11 and described switching output module 12
Controlled end connect, the input of the outfan of described switching output module 12 and described Voltage stabilizing module 13
Connecting, the outfan of described Voltage stabilizing module 13 is the outfan that described trailing edge triggers circuit 10.
Wherein, described trailing edge detection module 11 is for detecting that described IGBT drives signal input electricity
When the IGBT of road 5 input drives signal to be in trailing edge, control described switching output module 12 and open；
Described switching output module 12 is for when opening, exporting the first voltage signal；Described Voltage stabilizing module 13,
For the amplitude of the first voltage signal that described switching output module 12 exports is defined, to export
State trailing edge pulse signal.
Preferably, above-mentioned trailing edge detection module 11 include the first diode D1, the first resistance R1,
Two resistance R2, the first electric capacity C1 and the first comparator D1；The anode of described first diode D1 is institute
State the test side of trailing edge detection module 11, the negative electrode of described first diode D1 and described first resistance
R1 first end connect, second end of described first resistance R1 respectively with the first of described second resistance R2
The positive input of end, first end of described first electric capacity C1 and described first comparator D1 connects, institute
State the second end and the second end ground connection of described first electric capacity C1 of the second resistance R2；Described first comparator
The reverse input end of D1 inputs the first voltage reference signal, and the outfan of described first comparator D1 is institute
State the outfan of trailing edge detection module 11.I.e. first resistance R1 and the second resistance R2 series connection, the second electricity
Resistance R2 and the first electric capacity C1 is in parallel, the first resistance R1, the second resistance R2 and the public affairs of the first electric capacity C1
Connect end and the positive input of the first comparator D1 altogether；Second resistance R2's and the first electric capacity C1 is another
One public connecting end ground connection.
Preferably, above-mentioned switching output module 12 include the first switching tube Q1, the 3rd resistance R3, the 4th
Resistance R4 and the first power supply VCC1, wherein, the first switching tube Q1 is preferably PNP triode.
The emitter stage of described first switching tube Q1 is connected with first end of described 3rd resistance R3, described 3rd electricity
Second end of resistance R3 is connected with described first power supply VCC1, the transmitting of described first switching tube Q1
The controlled end that one end is described switching output module 12 that pole is connected with described 3rd resistance R3, described
The colelctor electrode of one switching tube Q1 is connected with one end of described 4th resistance R4, described 4th resistance R4's
Second end ground connection, described first switching tube Q1 is described switch with one end of described 4th resistance R4 interconnection
The outfan of output module (12), the base stage of described first switching tube Q1 drives signal with described IGBT
The outfan of input circuit 5 connects.
Preferably, above-mentioned Voltage stabilizing module 13 includes clamp supply VDD, the second diode D2 and the three or two
Pole pipe D3, the input that anode is described Voltage stabilizing module of described second diode D2, the described 2nd 2
The negative electrode of pole pipe D2 is connected with the anode of described 3rd diode D3, the moon of described 3rd diode D3
Pole is connected with described clamp supply VDD, and described second diode D2 is mutual with described 3rd diode D3
The outfan that one end is described Voltage stabilizing module even.Wherein, clamp supply VDD and the 3rd diode D3
Composition clamp circuit, carries out clamper to the power supply signal through the second diode D2 output, and is clamped to one
Fixed voltage value exports, and triggers the trailing edge pulse signal of circuit 10 output as trailing edge.This enforcement
The purpose of example is the high level that the high level amplitude making delay control circuit 20 and trailing edge trigger circuit 10
Amplitude is consistent, improves the accuracy controlled, it is to avoid due to switch the parasitic capacitance charging interval the most for the moment,
The voltage signal exported by switch is inconsistent, and makes delay control circuit 20 there is control deviation.Wherein
Clamp supply VDD can use 5 volts of power supplys.
Concrete reality in conjunction with above-mentioned trailing edge detection module 11, switching output module 12 and Voltage stabilizing module 13
Execute circuit, the circuit theory of three is described in detail, drive the high level pulsewidth phase of signal at IGBT
Between, the controlled end of the first switching tube Q1 receives IGBT and drives the level letter of signal input circuit 5 input
Number being also high level, the positive input voltage of the first comparator D1 is more than the base of its reverse input end simultaneously
Quasi-voltage, the first comparator D1 exports high level signal, and now, the first switching tube Q1 turns off.At IGBT
When driving signal trailing edge arriving (being jumped to low-level pulse width by high level pulsewidth), the first switching tube Q1
Controlled end receive IGBT drive signal input circuit 5 input level signal be low level, now,
The IGBT of signal input circuit 5 input is driven to drive signal to carry out owing to the first electric capacity C1 receives IGBT
Energy storage, carries out time delay with the high level pulsewidth to input to the first comparator D1 so that first makes IGBT
Driving the moment of signal trailing edge arriving (being jumped to low-level pulse width by high level pulsewidth), first compares
The positive input voltage of device D1, still above the reference voltage of its reverse input end, makes the first comparator
D1 exports high level, and the emitter stage level of the i.e. first switching tube Q1 is high level, now, and the first switch
Pipe Q1 opens, by the power supply signal output of the first power supply VCC1 output；Through the first switching tube Q1
The power supply signal second diode D2 rectification in Voltage stabilizing module 13 of colelctor electrode output (logical just filter
Negative) after, export to the 3rd diode D3, control the 3rd diode D3 conducting, after conducting, the three or two
The anode voltage of pole pipe D3 is clamped, and its anode voltage is that the voltage of clamp supply VDD output is plus two
The pressure drop of pole pipe, the signal after clamper i.e. triggers the trailing edge pulse signal of circuit 10 as above-mentioned trailing edge.
Additionally, the base stage of the first switching tube Q1 can arrange the negative electrode of a biasing resistor R15 and stabilivolt Z1
Connect, to provide bias voltage to the first switching tube Q1.
Based on above-described embodiment, it should be noted that trigger the specific embodiment of circuit 10 at this trailing edge
In, sixth resistance R6 and seventh resistance R7 be may further be provided, first end of the 6th resistance R6 and
One power supply VCC1 connects, the second end and first end of the 7th resistance R7, the first voltage comparator
Reverse input end interconnects, the second end ground connection of the 7th resistance R7.6th resistance R6 and the 7th resistance R7
First power supply VCC1 is carried out dividing potential drop and constitutes the first voltage reference signal.
In above-described embodiment, delay control circuit 20 can use the logic circuit arbitrarily realizing its function to realize,
In being preferable to carry out one, delay control circuit 20 includes charge-discharge modules 21 and comparison module 22.Specifically
Ground, the input that input is delay control circuit 20 of described charge-discharge modules 21, described discharge and recharge
The outfan of module 21 is connected with the positive input of described comparison module 22；Described comparison module 22
Reverse input end inputs the second reference voltage signal, and the outfan of described comparison module 22 is described time delay control
The outfan of circuit 20 processed.Wherein, comparison module 22 charge-discharge modules 21 do not receive trailing edge touch
During the trailing edge pulse signal that Power Generation Road 10 exports, control analog switching circuit 30 and open；In discharge and recharge
When module 21 receives the trailing edge pulse signal that trailing edge triggers circuit 10 output, it is charged energy storage,
And when charging voltage is higher than preset voltage value, controls analog switching circuit 30 and close；Work as charge-discharge modules
21 discharge electric energy after filling, are carried out the comparison signal of output comparison module 22 output by discharge process
Time delay.It is understood that the voltage of comparison module 22 positive input is charge-discharge modules 21
Discharge voltage, when the discharge voltage of charge-discharge modules 21 is higher than the reference voltage of its reverse input end, than
Relatively module 22 is output as height, and analog switching circuit 30 is not turned on；Discharge voltage when charge-discharge modules 21
During less than the second reference voltage of its reverse input end, comparison module 22 is output as low, analog switching circuit
30 conductings, now, drive signal to export to IGBT so that it is work.It should be noted that discharge and recharge mould
Block 21 starts to be discharged to its discharge voltage and is the IGBT after pulsewidth limits less than the time period of reference voltage
The low-level pulse width time, owing to this time more initial IGBT drives the low-level pulse width time of signal to increase,
Thus after ensureing LC oscillatory process is entered low pressure interval by high pressure interval, just control IGBT and open, keep away
Exempt to open during IGBT is in high pressure in LC oscillatory process and damage.
Preferably, above-mentioned charge-discharge modules 21 includes the described 8th resistance R8 and the second electric capacity C2 of parallel connection,
And the 9th resistance R9 and the 3rd electric capacity C3 of series connection, described 8th resistance R8's and the second electric capacity C2
One of them public connecting end is the input of described charge-discharge modules 21, and with described 9th resistance R9
Freely connect end connect, another public connecting end of described 8th resistance R8 and the second electric capacity C2 and
Described 3rd electric capacity C3 freely connects end ground connection, described 9th resistance R9 and described 3rd electric capacity simultaneously
The public connecting end of C3 is the outfan of described charge-discharge modules 21.In the present embodiment, the second electric capacity C2
Form prime charge-discharge circuit, the 3rd electric capacity C3 and the 9th resistance R9 with the 8th resistance R8 and form rear class
Charge-discharge circuit, when trailing edge triggers circuit output 5V power supply, first the second electric capacity C2 charges, the
Discharged by the 8th resistance R8 after two electric capacity C2 are fully charged and to the 3rd electricity after the 9th resistance R9 current limliting
Hold C3 charging, after the 3rd electric capacity C3 is fully charged, discharged by the 9th resistance R9, the 3rd electric capacity C3
Charging interval very fast, be negligible, therefore, the full electricity of the 3rd electric capacity C3 is less than to discharge voltage
This period of time of preset voltage value is the IGBT low-level pulse width time after pulsewidth limits.Wherein, second
Electric capacity C2 should select capacitance to be more than the 3rd electric capacity C3.This second electric capacity C2 mono-aspect can give the 3rd electric capacity
C3 provides more power supply, has been on the other hand isolation filter effect, it is to avoid during the 3rd electric capacity C3 charging
Affected by the first switching tube Q1 and the 3rd diode D3 voltage pulsation.
Preferably, above-mentioned comparison module 22 second power supply VCC2, the second comparator U2, it is connected on
The tenth resistance R10 between described second power supply VCC2 and ground connection and the 11st resistance R11, with
And it is connected to the 12nd resistance between described second power supply VCC2 and the second comparator U2 outfan
R12；Public connecting end between described tenth resistance R10 and the 11st resistance R11 compares mould to described
The reverse input end of block 22 inputs the second reference voltage signal；The forward input of described second comparator U2
End is the positive input of described comparison module 22, and the outfan of described second comparator U2 is described ratio
The relatively outfan of module 22.Wherein, the tenth resistance R10 and the 11st resistance R11 is to the second power supply
The voltage of VCC2 output carries out dividing potential drop, to constitute the reverse reference voltage (corresponding the of the second comparator U2
Two reference voltage signals), the size of this reverse reference voltage is according to the resonant frequency of LC oscillating circuitSize carries out relative set.In order to protect IGBT without damage, charge-discharge modules is typically set
21 charge to its electric discharge from it is reduced to the time t of reference voltage and is equal to
In above-described embodiment, analog switching circuit 30 can use the logic circuit arbitrarily realizing its function to realize,
In being preferable to carry out one, above-mentioned analog switching circuit 30 includes the 3rd power supply VCC3, simulation electronic
Switch K1 and the 13rd resistance R13.Specifically, described simulant electronic switch K1 include supply pin vdd,
First input pin s1, the first output pin da, control to connect between the first input pin s1 and the first output pin da
The the first controlled foot (a0 foot and a1 foot) led to or cut off and grounding leg (gnd foot and vss foot), described simulation
The supply pin vdd of electrical switch K1 is connected with described 3rd power supply VCC3, and described simulation electronic is opened
Close the input that the first input pin s1 is described analog switching circuit 30 of K1, described 13rd resistance
First end of R13 is connected with the first input pin s1 of described simulant electronic switch K1, described 13rd electricity
The outfan that second end is described analog switching circuit 30 of resistance R13, described simulant electronic switch K1's
First controlled foot is the controlled end of described analog switching circuit 30, the ground connection of described simulant electronic switch K1
Foot (gnd foot and vss foot) ground connection.Wherein, the first controlled foot includes a0 foot and a1 foot, and simulation electronic is opened
The a0 foot and the a1 foot that close K1 input when being all high level, first input pin of this simulant electronic switch K1
S1's and the first output pin da is separated, when a0 foot and the input of a1 foot are all low level, and this simulation electricity
Connect between the first input pin s1 and the first output pin da of son switch K1.
Based on this embodiment, above-mentioned analog switching circuit 30 still further comprises to push away exempts from output circuit 31, institute
State and push away the input exempting from output circuit 31 and be connected with described analog switching circuit 30 outfan, described in push away and exempt from
The outfan of output circuit 31 is connected with the driven moved end of described IGBT.Analog switching circuit 30 is by pushing away
Exempt from output circuit 31 push away exempt from export IGBT drive signal, drive IGBT, switching loss can be reduced,
Improve switch efficiency.
Specifically, push away and exempt from output circuit 31 and include second switch pipe Q2, the 3rd switching tube Q3 and the 14th
Resistance R14, the base stage of described second switch pipe Q2 and the base stage of the 3rd switching tube Q3 respectively with described mould
The the first output pin s1 intending electrical switch K1 connects, and the colelctor electrode of described first switching tube Q1 is through described the
14 resistance R14 are connected with described 3rd power supply VCC3, the transmitting of described first switching tube Q1
The emitter stage of pole and second switch pipe Q2 interconnects, and one end of this interconnection is described analog switching circuit 30
Outfan, be used for connecting IGBT；Wherein, the grounded collector of the 3rd switching tube Q3.
Based on above-mentioned all embodiments, below in conjunction with accompanying drawing 1, Fig. 2 and Fig. 3 to this utility model IGBT
The circuit theory driving the pulsewidth limiting circuit of signal is described in detail:
This utility model IGBT drives the pulsewidth limiting circuit of signal to drive signal input circuit by IGBT
5 input IGBT drive signal and export, and this IGBT drives signal through the 5th resistance R5 and stabilivolt
After the mu balanced circuit voltage stabilizing of Z1 composition, stabilize to 5 volts.These 5 volts of IGBT drive signal to be divided into three tunnels,
The first via is delivered to the first input pin s1 of simulant electronic switch K1, and the second tunnel is delivered to the first switching tube
The base stage of Q1, the 3rd tunnel is delivered to the positive input of the first comparator D1, the first comparator D1's
Reverse input end inputs by the 6th resistance R6 and the 7th resistance R7 the first power supply VCC1 dividing potential drop
Voltage signal, using the reverse reference voltage as the first comparator D1.Wherein, the first power supply VCC1
Voltage be 8 volts, the voltage of clamp supply VDD is 5 volts, and the voltage of the second power supply VCC2 is
8 volts, the voltage of the 3rd power supply VCC3 is 18 volts.
From the foregoing, it will be observed that during IGBT drives the high level pulsewidth of signal, the first switching tube Q1's is controlled
End then receive IGBT drive the level signal of signal input circuit 5 output also for high level, simultaneously first
The positive input voltage of comparator D1 is more than the reference voltage of its reverse input end, the first comparator D1
Output high level signal, now, the first switching tube Q1 turns off.Signal trailing edge is driven to arrive at IGBT
Time (being jumped to low-level pulse width by high level pulsewidth), the controlled end of the first switching tube Q1 receives IGBT
The level signal driving signal input circuit 5 output is low level, now, owing to the first electric capacity C1 receives
IGBT drives the IGBT of signal input circuit 5 output to drive signal to carry out energy storage, with to inputting to first
The high level pulsewidth of comparator D1 carries out time delay so that first makes IGBT drive signal trailing edge to arrive
The moment of (being jumped to low-level pulse width by high level pulsewidth), the positive input electricity of the first comparator D1
Press still above the reference voltage of its reverse input end, make the first comparator D1 export high level, i.e. first
The emitter stage level of switching tube Q1 is high level.Wherein, the IGBT of input drives signal to drive through IGBT
Waveform diagram after dynamic signal input circuit 5 and trailing edge detection module 11 process is as shown in Figure 3；Its
In, A1 is the wavy curve inputting the IGBT driving signal driving signal input circuit 5 to IGBT；
A2 is through Z1 voltage stabilizing, the first resistance R1 and the second resistance R2 current limliting, after the first electric capacity C1 discharge and recharge
IGBT drive signal wavy curve；A3 be the 6th resistance and the 7th resistance defeated to the first power supply
The signal gone out carries out the wavy curve after dividing potential drop；A4 is the comparison letter postponing output through the first comparator D1
Number wavy curve；A5 is cursor interval, represents the comparison signal of the first comparator D1 output and through IGBT
The IGBT driving signal input circuit 5 output drives the time difference of signal trailing edge.
When the emitter stage level of the first switching tube Q1 is high level, the first switching tube Q1 opens, and first
The power supply signal of power supply VCC1 output after the second diode D2 rectification (logical just every negative),
It is clamped to 5 volts of voltages, to ensure front stage circuit by clamp supply VDD and the 3rd diode D3
Level magnitudes consistent.Before after clamper, 5 volts of voltages are given and are made up of the 8th resistance R8 and the second electric capacity C2
The rear class charge-discharge circuit of level charge-discharge circuit and the 3rd electric capacity C3 and the 9th resistance R9 composition is charged,
Discharge again after Chong Maning.Wherein, through the signal waveform curve of the first switching tube Q1 output with through the second electricity
Holding the signal waveform curve after C2, the 3rd electric capacity C3 discharge and recharge as shown in Figure 4, in Fig. 4, A6 is through the
The signal waveform curve of one switching tube Q1 output, in Fig. 4, A7 is after the second electric capacity C2 discharge and recharge
Signal waveform curve.
Electric discharge during, the voltage of the positive input of the second comparator U2 with discharge voltage by up to
Low change, when the voltage of the discharge voltage reverse input end input higher than the second comparator U2, the second ratio
Relatively device U2 exports high level, and the first input pin s1 and the first output pin da of simulant electronic switch K1 are not
Conducting, IGBT does not works；Wherein, the voltage of the reverse input end input of the second comparator U2 is by the tenth
Resistance R10 and the 11st resistance R11 dividing potential drop obtain；When discharge voltage is less than the voltage of its reverse input end
Time, the second comparator U2 is output as low, the first input pin s1 of simulant electronic switch K1 and first output
Foot da turns on, and now, drives signal to export to IGBT so that it is work.Wherein, through the tenth resistance R10
With the 11st resistance R11 to the wavy curve after the second power supply VCC2 dividing potential drop and through the second comparator
U2 output signal waveform curve as it is shown in figure 5, in Fig. 5 A6 be through the tenth resistance R10 and the 11st
Resistance R11 is to the wavy curve after the second power supply VCC2 dividing potential drop；In Fig. 5, A9 is through the 9th electricity
Signal waveform curve after resistance R9 current limliting, the 3rd electric capacity C3 discharge and recharge；In Fig. 5, A10 is through the second ratio
The signal waveform curve of relatively device U2 output, wherein the low-level pulse width shown in A10 wavy curve is needs
The low-level pulse width safety value wanted, such as 10 microseconds, as long as ensureing to carry out pulsewidth through this pulsewidth limiting circuit
IGBT after restriction processes drives the low-level pulse width of signal more than or equal to this low-level pulse width safety
Value, it is ensured that after being entered low pressure interval by high pressure interval in LC oscillatory process, just control IGBT and open.
It is understood that be reduced to its discharge voltage starting electric discharge after the 3rd electric capacity C3 is fully charged
The time period t of the reverse reference voltage of the second comparator U2 is the IGBT low level arteries and veins after pulsewidth limits
The wide time, due to the growth of this time so that drives the low-level pulse width of signal to extend, ensures LC with this
After oscillatory process is entered low pressure interval by high pressure interval, just control IGBT and open, thus avoid IGBT
Open during LC oscillating circuit is in high pressure and damage.
Wherein, Fig. 6 is wavy curve during IGBT driving signal input pulsewidth exception, and Fig. 7 is IGBT
Wavy curve when driving signal input pulsewidth normal.Wherein, A11 is cursor, represents that IGBT drives letter
Number low-level pulse width more than low-level pulse width safety value, after this pulsewidth limiting circuit, its waveform
Curve is A12；A13 is cursor, represents that IGBT drives the low-level pulse width of signal less than low-level pulse width
Safety value, after being adjusted by this pulsewidth limiting circuit, its wavy curve is A14.
Additionally, can with further reference to shown in Fig. 8, in Fig. 8 A and B be IGBT drive signal and
The comparison of wave shape figure of IGBT oscillator signal, wherein A represents that IGBT drives the low-level pulse width of signal to occur
Time abnormal (narrow), during the high pressure in LC oscillatory process, turn on IGBT；B represents and passes through
The pulsewidth limiting circuit of IGBT driving signal carries out low-level pulse width to IGBT driving signal in A and prolongs
Waveform after length.In Fig. 8, n1 represents IGBT waveform；N2 represents that IGBT drives signal；T1 table
Show normal low-level pulse width；T2 represents abnormal low-level pulse width；M1 represents owing to IGBT drives signal
Low-level pulse width is abnormal, opens IGBT during the high pressure in LC oscillatory process；M2 represents in exception
IGBT is opened after extending the t3 time in low-level pulse width.From B in Fig. 8, due at abnormal IGBT
Drive and add the t3 time in low-level pulse width t2 of signal so that IGBT locates in LC oscillatory process
Just being opened during low pressure, the collector voltage thus avoiding IGBT is too high and damages IGBT, it is achieved
IGBT protected.
This utility model also provides for a kind of electromagnetic heater, this electromagnetic heater can be electric cooker,
The electric equipment such as electromagnetic oven, electric pressure cooking saucepan.In one embodiment, this electromagnetic heater includes above-mentioned IGBT
Drive the pulsewidth limiting circuit of signal；It is understood that owing to employing in electromagnetic heater
Stating IGBT and drive the pulsewidth limiting circuit of signal, therefore, the embodiment of this electromagnetic heater includes above-mentioned
IGBT drives whole technical schemes of the whole embodiment of pulsewidth limiting circuit of signal, and the technology reached
Effect is the most identical, does not repeats them here.
The foregoing is only preferred embodiment of the present utility model, not thereby limit of the present utility model specially
Profit scope, every under utility model of the present utility model is conceived, utilize this utility model description and attached
The equivalent structure transformation that figure content is made, or directly/be indirectly used in other relevant technical fields and all include
In scope of patent protection of the present utility model.
Claims (11)
1. the pulsewidth limiting circuit of an IGBT driving signal, it is characterized in that, circuit is triggered including trailing edge, delay control circuit, analog switching circuit, described trailing edge triggers the input of circuit and drives the outfan of signal input circuit to be connected with described IGBT, described trailing edge triggers the outfan of circuit and is connected with the input of described delay control circuit, the outfan of described delay control circuit is connected with the controlled end of described analog switching circuit, the input of described analog switching circuit drives the outfan of signal input circuit to be connected with described IGBT, the outfan of described analog switching circuit is connected with the driven moved end of IGBT；
Described trailing edge triggers circuit, during for driving the IGBT of signal input circuit input to drive signal to be in trailing edge at described IGBT, exports trailing edge pulse signal；
Described delay control circuit, is used for receiving described trailing edge pulse signal, and carries out energy storage and electric discharge, when discharge voltage is higher than preset voltage value, exports the first control signal, when discharge voltage is less than described preset voltage value, exports the second control signal；
Described analog switching circuit, for when receiving described first control signal, control its input to disconnect with outfan, stop described IGBT drives signal export to IGBT, control its input to connect with outfan when receiving described second control signal, to drive signal to export to IGBT described IGBT.
2. IGBT as claimed in claim 1 drives the pulsewidth limiting circuit of signal, it is characterized in that, described trailing edge triggers circuit and includes trailing edge detection module, switching output module and Voltage stabilizing module, the test side of described trailing edge detection module is the input that described trailing edge triggers circuit, the outfan of described trailing edge detection module is connected with the controlled end of described switching output module, the outfan of described switching output module is connected with the input of described Voltage stabilizing module, and the outfan of described Voltage stabilizing module is the outfan that described trailing edge triggers circuit；
Wherein, described trailing edge detection module, for when detecting that described IGBT drives the IGBT of signal input circuit input to drive signal to be in trailing edge, controlling described switching output module and open；
Described switching output module, for when opening, exporting the first voltage signal；
Described Voltage stabilizing module, the amplitude of the first voltage signal for exporting described switching output module is defined, to export described trailing edge pulse signal.
3. IGBT as claimed in claim 2 drives the pulsewidth limiting circuit of signal, it is characterised in that described trailing edge detection module includes the first diode, the first resistance, the second resistance, the first electric capacity and the first comparator；The anode of described first diode is the test side of described trailing edge detection module, the negative electrode of described first diode is connected with the first end of described first resistance, second end of described first resistance positive input with the first end of described second resistance, the first end of described first electric capacity and described first comparator respectively is connected, the second end of described second resistance and the second end ground connection of described first electric capacity；The reverse input end of described first comparator inputs the first voltage reference signal, and the outfan of described first comparator is the outfan of described trailing edge detection module.
4. IGBT as claimed in claim 3 drives the pulsewidth limiting circuit of signal, it is characterized in that, described switching output module includes the first switching tube, 3rd resistance, 4th resistance and the first power supply, the emitter stage of described first switching tube is connected with described first power supply through described 3rd resistance, the controlled end that one end is described switching output module that the emitter stage of described first switching tube is connected with described 3rd resistance, the colelctor electrode of described first switching tube is connected with one end of described 4th resistance, second end ground connection of described 4th resistance, described first switching tube and the outfan that one end is described switching output module of described 4th resistive interconnections, the base stage of described first switching tube drives the outfan of signal input circuit to be connected with described IGBT.
5. IGBT as claimed in claim 2 drives the pulsewidth limiting circuit of signal, it is characterized in that, described Voltage stabilizing module includes clamp supply, the second diode and the 3rd diode, the input that anode is described Voltage stabilizing module of described second diode, the negative electrode of described second diode is connected with the anode of described 3rd diode, the negative electrode of described 3rd diode is connected with described clamp supply, the outfan that one end is described Voltage stabilizing module that described second diode interconnects with described 3rd diode.
6. IGBT as claimed in claim 4 drives the pulsewidth limiting circuit of signal, it is characterized in that, described IGBT drives signal input circuit to include for inputting IGBT the driving signal input part of signal, the 5th resistance and stabilivolt, first end of described 5th resistance is connected with described signal input part, second end of described 5th resistance is connected respectively with the first end of the negative electrode of described stabilivolt, the base stage of described first switching tube and described first resistance, the plus earth of described stabilivolt；Second end of described 5th resistance is the outfan that IGBT drives signal input circuit with one end of the negative electrode interconnection of described stabilivolt.
7. the IGBT as described in claim 1 to 6 any one drives the pulsewidth limiting circuit of signal, it is characterized in that, described delay control circuit includes charge-discharge modules and comparison module, the input of described charge-discharge modules is the input of delay control circuit, and the outfan of described charge-discharge modules is connected with the positive input of described comparison module；The reverse input end of described comparison module inputs the second reference voltage signal, and the outfan of described comparison module is the outfan of described delay control circuit.
8. IGBT as claimed in claim 7 drives the pulsewidth limiting circuit of signal, it is characterized in that, described charge-discharge modules includes the 8th resistance and second electric capacity of parallel connection, and series connection the 9th resistance and the 3rd electric capacity, described 8th resistance and the input that one of them public connecting end is described charge-discharge modules of the second electric capacity, and connect with the end that is freely connected of described 9th resistance, described 8th resistance and another public connecting end of the second electric capacity and described 3rd electric capacity freely connect end ground connection simultaneously, described 9th resistance and the outfan that public connecting end is described charge-discharge modules of described 3rd electric capacity.
9. IGBT as claimed in claim 7 drives the pulsewidth limiting circuit of signal, it is characterized in that, described comparison module includes the second power supply, second comparator, it is connected on the tenth resistance between described second power supply and ground connection and the 11st resistance, and is connected to the 12nd resistance between described second power supply and the second comparator output terminal；Public connecting end between described tenth resistance and the 11st resistance inputs the second reference voltage signal to the reverse input end of described comparison module；The positive input that positive input is described comparison module of described second comparator, the outfan that outfan is described comparison module of described second comparator.
null10. the IGBT as described in claim 1 to 6 any one drives the pulsewidth limiting circuit of signal，It is characterized in that，Described analog switching circuit includes the 3rd power supply、Simulant electronic switch and the 13rd resistance，Described simulant electronic switch includes supply pin、First input pin、First output pin，Control the first controlled foot and the grounding leg connecting between the first input pin and the first output pin or cutting off，The supply pin of described simulant electronic switch is connected with described 3rd power supply，Described first end of the 13rd resistance is connected with the first input pin of described simulant electronic switch，The input that second end is described analog switching circuit of described 13rd resistance，The outfan that first output pin is described analog switching circuit of described simulant electronic switch，The controlled end that first controlled foot is described analog switching circuit of described simulant electronic switch，The grounding leg ground connection of described simulant electronic switch.
11. 1 kinds of electromagnetic heaters, it is characterised in that include that the IGBT as described in claim 1 to 10 any one drives the pulsewidth limiting circuit of signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620097414.5U CN205490469U (en) | 2016-01-29 | 2016-01-29 | IGBT drive signal's pulse width limiting circuit and electromagnetic heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620097414.5U CN205490469U (en) | 2016-01-29 | 2016-01-29 | IGBT drive signal's pulse width limiting circuit and electromagnetic heating device |
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| CN205490469U true CN205490469U (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108882422A (en) * | 2017-05-12 | 2018-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control circuit, method and electromagnetic heating apparatus |
-
2016
- 2016-01-29 CN CN201620097414.5U patent/CN205490469U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108882422A (en) * | 2017-05-12 | 2018-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control circuit, method and electromagnetic heating apparatus |
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