CN107026639A - The pulsewidth limiting circuit and electromagnetic heater of IGBT drive signals - Google Patents
The pulsewidth limiting circuit and electromagnetic heater of IGBT drive signals Download PDFInfo
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- CN107026639A CN107026639A CN201610070076.0A CN201610070076A CN107026639A CN 107026639 A CN107026639 A CN 107026639A CN 201610070076 A CN201610070076 A CN 201610070076A CN 107026639 A CN107026639 A CN 107026639A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of pulsewidth limiting circuit of IGBT drive signals and electromagnetic heater, the circuit includes IGBT drive signal input circuits, when IGBT drive signals for being inputted in IGBT drive signals input circuit are in trailing edge, export the trailing edge triggers circuit of trailing edge pulse signal, for receiving trailing edge pulse signal, and carry out energy storage and electric discharge, when discharge voltage is higher than preset voltage value, export the first control signal, when discharge voltage is less than preset voltage value, export the delay control circuit of the second control signal, for when receiving the first control signal, stopping exports IGBT drive signals to IGBT, IGBT drive signals are controlled to export to IGBT analog switching circuit when receiving the second control signal.The present invention can avoid the problem of IGBT is opened and damaged during being in high pressure in LC oscillatory processes, improve the security of IGBT work.
Description
Technical field
The present invention relates to the pulsewidth limitation electricity in electric-heating technology field, more particularly to a kind of IGBT drive signals
Road and electromagnetic heater.
Background technology
IGBT is a kind of switching device for high voltage control.In LC oscillating circuits, IGBT current collection
Pole is connected with LC, and IGBT grounded emitter, IGBT grid is connected with drive circuit.
When LC is powered, vibration is produced due to the mutual discharge and recharges of LC, make LC voltages high pressure and low pressure it
Between back and forth switch.Wherein, by drive circuit export IGBT drive signals, control IGBT accordingly open or
Person closes, and to avoid LC voltages from being in balance, and stops oscillation.
When drive circuit exports high level signal, IGBT is opened, and control LC oscillating circuits discharge over the ground,
Realize and reset, now, the current potential of IGBT colelctor electrodes is in low-voltage.
When drive circuit exports low level signal, IGBT is closed, and LC starts discharge and recharge, during this
LC voltages are toggled between high pressure conditions and low-pressure state, accordingly, and IGBT collector potential exists
Toggled between high pressure conditions and low-pressure state, if opening IGBT during LC high pressures, it is likely that
Because its collector voltage is too high, and IGBT is caused damage.
The content of the invention
It is a primary object of the present invention to provide a kind of pulsewidth limiting circuit of IGBT drive signals, purport is avoided
The problem of IGBT is opened and damaged during being in high pressure in LC oscillatory processes, improves IGBT work
Security.
To achieve the above object, the present invention proposes a kind of pulsewidth limiting circuit of IGBT drive signals, should
The pulsewidth limiting circuit of IGBT drive signals includes the IGBT driving letters for being used to input IGBT drive signals
Number input circuit, trailing edge triggers circuit, delay control circuit, analog switching circuit, the trailing edge
The input of triggers circuit is connected with the output end of the IGBT drive signals input circuit, the trailing edge
The output end of triggers circuit is connected with the input of the delay control circuit, the delay control circuit
Output end is connected with the controlled end of the analog switching circuit, the input of the analog switching circuit and institute
State IGBT drive signal input circuits output end connection, the output end of the analog switching circuit with
IGBT driven moved end connection；
The trailing edge triggers circuit, for the IGBT inputted in the IGBT drive signals input circuit
When drive signal is in trailing edge, trailing edge pulse signal is exported；
The delay control circuit, for receiving the trailing edge pulse signal, and carries out energy storage and electric discharge,
When discharge voltage is higher than preset voltage value, the first control signal is exported, in discharge voltage less than described pre-
If during magnitude of voltage, exporting the second control signal；
The analog switching circuit, for when receiving first control signal, controlling its input
Disconnected with output end, stopping exports the IGBT drive signals to IGBT, is receiving described second
Control its input and output end to connect during control signal, by the IGBT drive signals export to
IGBT。
Preferably, the trailing edge triggers circuit includes trailing edge detection module, switching output module and steady
Die block, the test side of the trailing edge detection module is the input of the trailing edge triggers circuit, institute
The output end for stating trailing edge detection module is connected with the controlled end of the switching output module, and the switch is defeated
The output end for going out module is connected with the input of the Voltage stabilizing module, and the output end of the Voltage stabilizing module is institute
State the output end of trailing edge triggers circuit；
Wherein, the trailing edge detection module, for detecting the IGBT drive signals input circuit
When the IGBT drive signals of input are in trailing edge, the switching output module is controlled to open；
The switching output module, for when opening, exporting first voltage signal；
The Voltage stabilizing module, the amplitude of the first voltage signal for being exported to the switching output module is entered
Row is limited, to export the trailing edge pulse signal.
Preferably, the trailing edge detection module include the first diode, first resistor, second resistance,
First electric capacity and first comparator；The anode of first diode is the inspection of the trailing edge detection module
End is surveyed, the negative electrode of first diode is connected with the first end of the first resistor, the first resistor
The second end first end, first end of first electric capacity and described first respectively with the second resistance
Second end of the positive input connection of comparator, the second end of the second resistance and first electric capacity
Ground connection；The reverse input end input first voltage reference signal of the first comparator, described first compares
The output end of device is the output end of the trailing edge detection module.
Preferably, the switching output module includes first switch pipe, 3rd resistor, the 4th resistance and the
One power supply, the emitter stage of the first switch pipe is through the 3rd resistor and first power supply
Connection, one end that the emitter stage of the first switch pipe is connected with the 3rd resistor is the switch output
The controlled end of module, the colelctor electrode of the first switch pipe is connected with one end of the 4th resistance, described
The second end ground connection of 4th resistance, the first switch pipe and one end of the 4th resistive interconnections are described
The output end of switching output module, the base stage of the first switch pipe inputs electricity with the IGBT drive signals
The output end connection on road.
Preferably, the Voltage stabilizing module includes clamp supply, the second diode and the 3rd diode, described
The anode of second diode be the Voltage stabilizing module input, the negative electrode of second diode with it is described
The anode connection of 3rd diode, the negative electrode of the 3rd diode is connected with the clamp supply, described
Second diode and the output end that one end that the 3rd diode is interconnected is the Voltage stabilizing module.
Preferably, the IGBT drive signals input circuit includes the letter for being used to input IGBT drive signals
Number input, the 5th resistance and voltage-stabiliser tube, first end and the signal input part of the 5th resistance connect
Connect, the second end of the 5th resistance and the negative electrode of the voltage-stabiliser tube, the base stage of the first switch pipe and
The first end of the first resistor is connected respectively, the plus earth of the voltage-stabiliser tube；5th resistance
One end that the negative electrode of second end and the voltage-stabiliser tube is interconnected is the output end of IGBT drive signal input circuits.
Preferably, the delay control circuit includes charge-discharge modules and comparison module, the discharge and recharge mould
The input of block is the input of delay control circuit, and the output end of the charge-discharge modules is compared with described
The positive input connection of module；The reverse input end of the comparison module inputs the second reference voltage signal,
The output end of the comparison module is the output end of the delay control circuit.
Preferably, the charge-discharge modules include the 8th resistance and the second electric capacity in parallel, and string
The 9th resistance and the 3rd electric capacity of connection, one of public connecting end of the 8th resistance and the second electric capacity
For the input of the charge-discharge modules, and it is connected with the free connection end of the 9th resistance, described
The free connection end of another public connecting end and the 3rd electric capacity of eight resistance and the second electric capacity connects simultaneously
Ground, the public connecting end of the 9th resistance and the 3rd electric capacity is the output end of the charge-discharge modules.
Preferably, the comparison module includes the second power supply, and the second comparator is connected on described the
The tenth resistance and the 11st resistance between two power supplies and ground connection, and it is connected to second power supply
The 12nd resistance between power supply and the second comparator output terminal；Tenth resistance and the 11st resistance it
Between reverse input end from public connecting end to the comparison module input the second reference voltage signal；It is described
The positive input of second comparator is the positive input of the comparison module, second comparator
Output end is the output end of the comparison module.
Preferably, the analog switching circuit includes the 3rd power supply, simulant electronic switch and the 13rd
Resistance, the simulant electronic switch includes supply pin, the first input pin, the first output pin, control first
The the first controlled pin and grounding leg for connecting or cutting off between input pin and the first output pin, the simulation electricity
The supply pin of sub switch is connected with the 3rd power supply, the first end of the 13rd resistance with it is described
The first input pin connection of simulant electronic switch, the second end of the 13rd resistance is the analog switch
The input of circuit, the first output pin of the simulant electronic switch is the output of the analog switching circuit
End, the first controlled pin of the simulant electronic switch is the controlled end of the analog switching circuit, the mould
Intend the grounding leg ground connection of electronic switch.
The present invention also provides a kind of electromagnetic heater, and the electromagnetic heater includes IGBT as described above
The pulsewidth limiting circuit of drive signal, the pulsewidth limiting circuit of the IGBT drive signals includes being used to input
The IGBT drive signals input circuits of IGBT drive signals, trailing edge triggers circuit, delay control circuit,
Analog switching circuit, the input of the trailing edge triggers circuit and the IGBT drive signals input circuit
Output end connection, the output end of the trailing edge triggers circuit and the input of the delay control circuit
Connection, the output end of the delay control circuit is connected with the controlled end of the analog switching circuit, described
The input of analog switching circuit is connected with the output end of the IGBT drive signals input circuit, the mould
Intend the output end of on-off circuit and IGBT driven moved end is connected；The trailing edge triggers circuit, for
When the IGBT drive signals of the IGBT drive signals input circuit input are in trailing edge, output declines
Along pulse signal；The delay control circuit, for receiving the trailing edge pulse signal, and is stored up
It and can discharge, when discharge voltage is higher than preset voltage value, the first control signal exported, in discharge voltage
During less than the preset voltage value, the second control signal is exported；The analog switching circuit, for connecing
When receiving first control signal, its input is controlled to be disconnected with output end, the IGBT is driven in stopping
Dynamic signal output controls its input to be terminated with output to IGBT when receiving second control signal
It is logical, the IGBT drive signals are exported to IGBT.
Between the present invention is determined at the beginning of IGBT drive signal trailing edges by trailing edge triggers circuit, and
When the IGBT drive signals of IGBT drive signals input circuit input are in trailing edge, pass through delays time to control
The energy storage of circuit and discharge process carry out delays time to control to it, to increase the control of drive signal low-level pulse width
Time processed, ensure that LC is entered behind low pressure interval in oscillatory process by high pressure interval with this, just control simulation
On-off circuit exports the IGBT drive signals of low-level pulse width to IGBT, it is ensured that IGBT is not in LC
Oscillating circuit is opened and damaged during being in high pressure, so as to improve the security of IGBT work.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to reality
The accompanying drawing used required for applying in example or description of the prior art is briefly described, it should be apparent that, below
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it can also obtain other according to the structure shown in these accompanying drawings
Accompanying drawing.
Fig. 1 is the circuit block diagram of the pulsewidth limiting circuit preferred embodiment of IGBT drive signals of the present invention；
Fig. 2 is the electrical block diagram of the pulsewidth limiting circuit of the IGBT drive signals shown in Fig. 1；
Fig. 3 is the IGBT drive signals of input through IGBT drive signals input circuit and trailing edge detection module
Waveform diagram after processing；
Fig. 4 is for the signal waveform curve through the output of first switch pipe and through the second electric capacity, the 3rd capacitor charge and discharge
Signal waveform curve afterwards；
Fig. 5 is to the wavy curve after the second power supply VCC2 partial pressures through the tenth resistance and the 11st resistance
And the signal waveform curve exported through the second comparator U2；
Fig. 6 is wavy curve when IGBT drive signals input pulsewidth exception；
Fig. 7 is wavy curve when IGBT drive signals input pulsewidth is normal；
Fig. 8 is that IGBT drive signals exception occur and to the ripple after abnormal handle with IGBT oscillator signals
Shape comparison diagram.
Drawing reference numeral explanation：
The realization, functional characteristics and advantage of the object of the invention will be done further referring to the drawings in conjunction with the embodiments
Explanation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, the scope of protection of the invention is belonged to.
It is to be appreciated that in the embodiment of the present invention institute it is directional indicate (such as upper and lower, left and right, it is preceding,
It is only used for explaining the relative position under a certain particular pose (as shown in drawings) between each part afterwards ...)
Relation, motion conditions etc. are put, if the particular pose changes, directionality indicates also corresponding
Ground changes therewith.
In addition, the description for being related to " first ", " second " etc. in the present invention is only used for describing purpose, and can not
It is interpreted as indicating or implies its relative importance or the implicit quantity for indicating indicated technical characteristic.By
This, defines " first ", at least one this feature can be expressed or be implicitly included to the feature of " second ".
In addition, the technical scheme between each embodiment can be combined with each other, but must be common with this area
Technical staff can be implemented as basis, should when the combination appearance of technical scheme is conflicting or can not realize
When the combination for thinking this technical scheme is not present, also not within the protection domain of application claims.
The present invention proposes a kind of pulsewidth limiting circuit of IGBT drive signals, for IGBT drive circuit
The low-level pulse width of the drive signal of output carries out minimum interval limitation, to avoid IGBT from being shaken in LC
Open and damage during being in high pressure during swinging.
Reference picture 1 and Fig. 2, in embodiments of the present invention, the pulsewidth limiting circuit of the IGBT drive signals
Including IGBT drive signals input circuit 5, trailing edge triggers circuit 10, delay control circuit 20 and mould
Intend on-off circuit 30.
Specifically, the input of the trailing edge triggers circuit 10 and IGBT drive signals input circuit 5
Output end connection, the output end of the trailing edge triggers circuit 10 and the delay control circuit 20
Input is connected, and the output end of the delay control circuit 20 is controlled with the analog switching circuit 30
End connection, the input of the analog switching circuit 30 and the IGBT drive signals input circuit 5
Output end is connected, and the output end of the analog switching circuit 30 and IGBT driven moved end are connected.
In the present embodiment, IGBT drive signals input circuit 5 is used to input IGBT drive signals；Decline
The IGBT drive signals for being used to input in the IGBT drive signals input circuit 5 along triggers circuit 10
During in trailing edge, trailing edge pulse signal is exported；Delay control circuit 20 is used to receive the trailing edge
Pulse signal, and energy storage and electric discharge are carried out, when discharge voltage is higher than preset voltage value, output first is controlled
Signal processed, when discharge voltage is less than the preset voltage value, exports the second control signal；Analog switch
Circuit 30 is used for when receiving first control signal, controls its input to be disconnected with output end, stops
Only the IGBT drive signals are exported to IGBT, it is controlled when receiving second control signal
Input is connected with output end, and the IGBT drive signals are exported to IGBT.Wherein, delay control
The discharge time of circuit 20 processed can be configured according to the electricity of its storage, you can with suitable by selection
The length of time t when the delay control circuit 20 of reserve of electricity is discharged to preset voltage value to determine it, should
Discharge time t is the control time of IGBT drive signal low-level pulse widths.It should be appreciated that the time
T is adds the t3 times on the basis of original I GBT drive signal low-level pulse widths t1, such as Fig. 3 institutes
Show.Wherein, the t3 times specifically can adjust putting for delay control circuit 20 by selecting suitable device
The electric time is determined.Time t3 as protect IGBT not in LC oscillatory processes be in high pressure during
The time opened and damaged.It is general to set delay control circuit 20 to fill in order to protect IGBT without damage
The time t that electricity is reduced to predeterminated voltage to its discharge voltage is equal toShouldFor input L and C
Harmonic period.
When the IGBT drive signals inputted in IGBT drive signals input circuit 5 have just enter into trailing edge, no
Control IGBT conductings immediately, but delays time to control is carried out to it by delay control circuit 20, with warp
Cross after one section of guard time (delay), it is ensured that it is interval that LC enters low pressure in oscillatory process by high pressure interval
Just control analog switching circuit 30 is opened afterwards, and turns on IGBT, avoids IGBT from vibrating electricity in LC with this
Open and damage during being in high pressure in road.And then when the drive signal controls analog switching circuit 30, protect
Demonstrate,prove during IGBT is in high pressure not in LC oscillatory processes and open and damage, so as to improve IGBT works
The security of work.
In above-described embodiment, the IGBT drive signals input circuit includes being used to input IGBT driving letters
Number signal input part PWM-IN, the 5th resistance R5 and voltage-stabiliser tube Z1, the of the 5th resistance R5
One end is connected with the signal input part PWM-IN, the second end of the 5th resistance R5 with it is described steady
The first end of pressure pipe Z1 negative electrode, the base stage of the first switch pipe Q1 and the first resistor R1 point
Do not connect, the plus earth of the voltage-stabiliser tube Z1；The second end of the 5th resistance R5 and the voltage stabilizing
One end of pipe Z1 negative electrode interconnection is the output end of IGBT drive signal input circuits.Wherein, the 5th electricity
The IGBT that resistance R5 and voltage-stabiliser tube Z1 composition mu balanced circuits are inputted to IGBT drive signals input circuit 5
Drive signal carries out voltage stabilizing.The purpose of the present embodiment is the incoming level amplitude of each circuit module of unified rear class.
In above-described embodiment, trailing edge triggers circuit 10 can be real using any logic circuit for realizing its function
Existing, in one is preferable to carry out, trailing edge triggers circuit 10 includes trailing edge detection module 11, switch output
Triggered for the trailing edge module 12 and Voltage stabilizing module 13, the test side of the trailing edge detection module 11
The input of circuit 10, the output end of the trailing edge detection module 11 and the switching output module 12
Controlled end connection, the input of the output end of the switching output module 12 and the Voltage stabilizing module 13
Connection, the output end of the Voltage stabilizing module 13 is the output end of the trailing edge triggers circuit 10.
Wherein, the trailing edge detection module 11 is used to detect the IGBT drive signals input electricity
When the IGBT drive signals that road 5 is inputted are in trailing edge, the switching output module 12 is controlled to open；
The switching output module 12 is used to, when opening, export first voltage signal；The Voltage stabilizing module 13,
The amplitude of first voltage signal for being exported to the switching output module 12 is defined, to export
State trailing edge pulse signal.
Preferably, above-mentioned trailing edge detection module 11 includes the first diode D1, first resistor R1, the
Two resistance R2, the first electric capacity C1 and first comparator D1；The anode of the first diode D1 is institute
State the test side of trailing edge detection module 11, negative electrode and the first resistor of the first diode D1
R1 first end connection, the second end of the first resistor R1 respectively with the second resistance R2 first
The positive input connection at end, the first end of the first electric capacity C1 and the first comparator D1, institute
State second resistance R2 the second end and the second end ground connection of the first electric capacity C1；The first comparator
D1 reverse input end input first voltage reference signal, the output end of the first comparator D1 is institute
State the output end of trailing edge detection module 11.I.e. first resistor R1 connects with second resistance R2, the second electricity
Hinder R2 in parallel with the first electric capacity C1, first resistor R1, second resistance R2 and the first electric capacity C1 public affairs
Common connection end and first comparator D1 positive input；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 includes first switch pipe Q1,3rd resistor R3, the 4th
Resistance R4 and the first power supply VCC1, wherein, first switch pipe Q1 is preferably PNP triode.
The emitter stage of the first switch pipe Q1 is connected with the first end of the 3rd resistor R3, the 3rd electricity
Resistance R3 the second end is connected with the first power supply VCC1, the transmitting of the first switch pipe Q1
One end that pole is connected with the 3rd resistor R3 is the controlled end of the switching output module 12, described the
One switching tube Q1 colelctor electrode is connected with one end of the 4th resistance R4, the 4th resistance R4's
Second end is grounded, and one end that the first switch pipe Q1 and the 4th resistance R4 is interconnected is the switch
The output end of output module (12), base stage and the IGBT drive signals of the first switch pipe Q1
The output end connection of input circuit 5.
Preferably, above-mentioned Voltage stabilizing module 13 includes clamp supply VDD, the second diode D2 and the three or two
Pole pipe D3, the second diode D2 anode are the input of the Voltage stabilizing module, the described 2nd 2
Pole pipe D2 negative electrode is connected with the anode of the 3rd diode D3, the moon of the 3rd diode D3
Pole is connected with the clamp supply VDD, and the second diode D2 and the 3rd diode D3 are mutual
One end even is the output end of the Voltage stabilizing module.Wherein, clamp supply VDD and the 3rd diode D3
Clamp circuit is constituted, clamper is carried out to the power supply signal exported through the second diode D2, and be clamped to one
Fixed voltage value is exported, and the trailing edge pulse signal exported as trailing edge triggers circuit 10.This implementation
The purpose of example is the high level amplitude for making delay control circuit 20 with the high level of trailing edge triggers circuit 10
Amplitude is consistent, improves the accuracy of control, it is to avoid due to switch the parasitic capacitance charging interval not for the moment,
It is inconsistent by the voltage signal for switching output, and delay control circuit 20 is there is control deviation.Wherein
Clamp supply VDD can be using 5 volts of power supplys.
With reference to the specific reality of above-mentioned trailing edge detection module 11, switching output module 12 and Voltage stabilizing module 13
Circuit is applied, the circuit theory to three is described in detail, in the high pulse width phase of IGBT drive signals
Between, first switch pipe Q1 controlled end receives the level letter of the input of IGBT drive signals input circuit 5
Number for also high level, while first comparator D1 positive input voltage is more than the base of its reverse input end
Quasi- voltage, first comparator D1 output high level signals, now, first switch pipe Q1 shut-offs.In IGBT
During drive signal trailing edge arriving (jumping to low-level pulse width by high pulse width), first switch pipe Q1
Controlled end receive IGBT drive signals input circuit 5 input level signal be low level, now,
Because the first electric capacity C1 IGBT drive signals for receiving the input of IGBT drive signals input circuit 5 are carried out
Energy storage, to enter line delay to the high pulse width inputted to first comparator D1 so that first causes IGBT
The moment of drive signal trailing edge arriving (jumping to low-level pulse width by high pulse width), first compares
Device D1 reference voltage of the positive input voltage still above its reverse input end, makes first comparator
D1 outputs high level, i.e. first switch pipe Q1 emitter stage level are high level, now, first switch
Pipe Q1 is opened, and the power supply signal that the first power supply VCC1 is exported is exported；Through first switch pipe Q1
Colelctor electrode output the second diode D2 rectifications (logical positive filter for passing through in Voltage stabilizing module 13 of power supply signal
It is negative) after, output to the 3rd diode D3, control the 3rd diode D3 conductings, after conducting, the three or two
Pole pipe D3 anode voltage is clamped, and its anode voltage is that the voltage that clamp supply VDD is exported adds two
Signal after the pressure drop of pole pipe, clamper is the trailing edge pulse signal as above-mentioned trailing edge triggers circuit 10.
In addition, a biasing resistor R15 and voltage-stabiliser tube Z1 negative electrode can be set in first switch pipe Q1 base stage
Connection, to provide bias voltage to first switch pipe Q1.
Based on above-described embodiment, it is necessary to illustrate, in the specific embodiment of the trailing edge triggers circuit 10
In, it may further be provided the 6th resistance R6 and the 7th resistance R7, the 6th resistance R6 first end and the
One power supply VCC1 connections, the second end and the 7th resistance R7 first end, first voltage comparator
Reverse input end is interconnected, the 7th resistance R7 the second end ground connection.6th resistance R6 and the 7th resistance R7
Partial pressure is carried out to the first power supply VCC1 and first voltage reference signal is constituted.
In above-described embodiment, delay control circuit 20 can be realized using any logic circuit for realizing its function,
In one is preferable to carry out, delay control circuit 20 includes charge-discharge modules 21 and comparison module 22.Specifically
Ground, the input of the charge-discharge modules 21 is the input of delay control circuit 20, the discharge and recharge
The output end of module 21 is connected with the positive input of the comparison module 22；The comparison module 22
Reverse input end inputs the second reference voltage signal, and the output end of the comparison module 22 is the delay control
The output end of circuit 20 processed.Wherein, comparison module 22 does not receive trailing edge in charge-discharge modules 21 and touched
During the trailing edge pulse signal that Power Generation Road 10 is exported, control analog switching circuit 30 is opened；In discharge and recharge
When module 21 receives the trailing edge pulse signal of the output of trailing edge triggers circuit 10, charging energy-storing is carried out,
And when charging voltage is higher than preset voltage value, control analog switching circuit 30 is closed；Work as charge-discharge modules
21 discharge electric energy after filling, and the comparison signal exported by discharge process to output comparison module 22 is carried out
Delay.It is understood that the voltage of the positive input of comparison module 22 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
Height is output as compared with module 22, analog switching circuit 30 is not turned on；When the discharge voltage of charge-discharge modules 21
Less than its reverse input end the second reference voltage when, comparison module 22 is output as low, analog switching circuit
30 conductings, now, drive signal is exported to IGBT, makes its work.It should be noted that discharge and recharge mould
It is IGBT after pulsewidth limitation that block 21, which starts to be discharged to its discharge voltage less than the period of reference voltage,
The low-level pulse width time, because the low-level pulse width time of the time more initial IGBT drive signals increases,
So as to ensure that just control IGBT is opened, and is kept away in LC oscillatory processes behind the interval interval into low pressure of high pressure
Exempt to open and damage during IGBT is in high pressure in LC oscillatory processes.
Preferably, above-mentioned charge-discharge modules 21 include the 8th resistance R8 and the second electric capacity C2 in parallel,
And the 9th resistance R9 and the 3rd electric capacity C3 of series connection, the 8th resistance R8's and the second electric capacity C2
One of public connecting end be the charge-discharge modules 21 input, and with the 9th resistance R9
Free connection end connection, another public connecting end of the 8th resistance R8 and the second electric capacity C2 and
The free connection end of the 3rd electric capacity C3 is grounded simultaneously, the 9th resistance R9 and the 3rd electric capacity
C3 public connecting end is the output end of the charge-discharge modules 21.In the present embodiment, the second electric capacity C2
Prime charge-discharge circuit, the 3rd electric capacity C3 and the 9th resistance R9 composition rear classes are constituted with the 8th resistance R8
Charge-discharge circuit, when trailing edge triggers circuit exports 5V power supplys, the second electric capacity C2 charges first, the
Discharged and after the 9th resistance R9 current limlitings to the 3rd electricity by the 8th resistance R8 after two electric capacity C2 are fully charged
Hold C3 chargings, after the 3rd electric capacity C3 is fully charged, discharged by the 9th resistance R9, the 3rd electric capacity C3
Charging interval it is very fast, can be ignored, therefore, the full electricity of the 3rd electric capacity C3 to discharge voltage is less than
This of preset voltage value is for a period of time the IGBT low-level pulse width times after pulsewidth limitation.Wherein, second
Electric capacity C2 should select capacitance to be more than the 3rd electric capacity C3.On the one hand second electric capacity C2 can give the 3rd electric capacity
C3 provides more power supplys, has on the other hand been isolation filter effect, it is to avoid when the 3rd electric capacity C3 charges
Influenceed by first switch pipe Q1 and the 3rd diode D3 voltage pulsations.
Preferably, above-mentioned comparison module 22 second power supply VCC2, the second comparator U2, are connected on
The tenth resistance R10 and the 11st resistance R11 between the second power supply VCC2 and ground connection, with
And it is connected to the 12nd resistance between the second power supply VCC2 and the second comparator U2 output ends
R12；Public connecting end between the 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 positive input of the second comparator U2
Hold as the positive input of the comparison module 22, the output end of the second comparator U2 is the ratio
Compared with the output end of module 22.Wherein, the tenth resistance R10 and the 11st resistance R11 are to the second power supply
The voltage of VCC2 outputs carries out partial pressure, to constitute the second comparator U2 reverse reference voltage (correspondence the
Two reference voltage signals), the size of the reverse reference voltage is according to the resonant frequencies of LC oscillating circuitsSize carries out relative set.In order to protect IGBT without damage, charge-discharge modules are 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 be realized using any logic circuit for realizing its function,
In one is preferable to carry out, above-mentioned analog switching circuit 30 includes the 3rd power supply VCC3, simulation electronic
Switch K1 and the 13rd resistance R13.Specifically, the simulant electronic switch K1 include supply pin vdd,
Connect between first input pin s1, the first output pin da, control the first input pin s1 and the first output pin da
Logical or cut-out the first controlled pin (a0 pin and a1 pin) and grounding leg (gnd pin and vss pin), the simulation
Electronic switch K1 supply pin vdd is connected with the 3rd power supply VCC3, and the simulation electronic is opened
The the first input pin s1 for closing K1 is the input of the analog switching circuit 30, the 13rd resistance
R13 first end is connected with the first input pin s1 of the simulant electronic switch K1, the 13rd electricity
The second end for hindering R13 is the output end of the analog switching circuit 30, the simulant electronic switch K1's
First controlled pin is the controlled end of the analog switching circuit 30, the ground connection of the simulant electronic switch K1
Pin (gnd pin and vss pin) is grounded.Wherein, the first controlled pin includes a0 pin and a1 pin, and simulation electronic is opened
When the a0 pin and the input of a1 pin for closing K1 are all high level, simulant electronic switch K1 the first input pin
S1's and the first output pin da is separated, when a0 pin and a1 pin input all be low level when, the simulation electricity
Connected between sub switch K1 the first input pin s1 and the first output pin da.
Based on the embodiment, above-mentioned analog switching circuit 30, which still further comprises to push away, exempts from output circuit 31, institute
State and push away the input for exempting from output circuit 31 and be connected with the output end of analog switching circuit 30, described push away is exempted from
The output end of output circuit 31 is connected with the driven moved end of the IGBT.Analog switching circuit 30 is by pushing away
Exempt from output circuit 31 push away exempt from export IGBT drive signals, drive IGBT, switching loss can be reduced,
Improve switch efficiency.
Specifically, push away and exempt from output circuit 31 including second switch pipe Q2, the 3rd switching tube Q3 and the 14th
Resistance R14, the base stage of the second switch pipe Q2 and the 3rd switching tube Q3 base stage respectively with the mould
Intend electronic switch K1 the first output pin s1 connections, the colelctor electrode of the first switch pipe Q1 is through described the
14 resistance R14 are connected with the 3rd power supply VCC3, the transmitting of the first switch pipe Q1
Pole and second switch pipe Q2 emitter stage interconnection, and one end of the interconnection is the analog switching circuit 30
Output end, for connecting IGBT；Wherein, the 3rd switching tube Q3 grounded collector.
Based on above-mentioned all embodiments, IGBT of the present invention is driven below in conjunction with accompanying drawing 1, Fig. 2 and Fig. 3
The circuit theory of the pulsewidth limiting circuit of signal is described in detail：
The pulsewidth limiting circuit of IGBT drive signals of the present invention is defeated by IGBT drive signals input circuit 5
Enter IGBT drive signals and export, the IGBT drive signals pass through the 5th resistance R5 and voltage-stabiliser tube Z1
After the mu balanced circuit voltage stabilizing of composition, 5 volts are stabilized to.5 volts of IGBT drive signals are divided into three tunnels, first
Road is delivered to simulant electronic switch K1 the first input pin s1, and the second tunnel is delivered to first switch pipe Q1's
Base stage, the 3rd tunnel is delivered to first comparator D1 positive input, and first comparator D1's is reverse defeated
Enter end input to believe the voltage of the first power supply VCC1 partial pressures by the 6th resistance R6 and the 7th resistance R7
Number, using the reverse reference voltage as first comparator D1.Wherein, the first power supply VCC1 electricity
Press as 8 volts, clamp supply VDD voltage is 5 volts, the second power supply VCC2 voltage is 8 volts,
3rd power supply VCC3 voltage is 18 volts.
From the foregoing, it will be observed that during the high pulse width of IGBT drive signals, first switch pipe Q1's is controlled
The level signal that end then receives the output of IGBT drive signals input circuit 5 is also high level, while first
Comparator D1 positive input voltage is more than the reference voltage of its reverse input end, first comparator D1
High level signal is exported, now, first switch pipe Q1 shut-offs.Arrive in IGBT drive signals trailing edge
When (jumping to low-level pulse width by high pulse width), first switch pipe Q1 controlled end receives IGBT
The level signal that drive signal input circuit 5 is exported is low level, now, because the first electric capacity C1 is received
The IGBT drive signals that IGBT drive signals input circuit 5 is exported carry out energy storage, with to inputting to first
Comparator D1 high pulse width enters line delay so that first causes IGBT drive signals trailing edge to arrive
The moment of (low-level pulse width is jumped to by high pulse width), first comparator D1 positive input electricity
The reference voltage still above its reverse input end is pressed, first comparator D1 is exported high level, i.e., first
Switching tube Q1 emitter stage level is high level.Wherein, the IGBT drive signals of input drive through IGBT
Waveform diagram after dynamic signal input circuit 5 and trailing edge detection module 11 are handled is as shown in Figure 3；Its
In, A1 is wavy curve of the input to the IGBT drive signals of IGBT drive signals input circuit 5；
A2 is through Z1 voltage stabilizings, first resistor R1 and second resistance R2 current limlitings, after the first electric capacity C1 discharge and recharges
IGBT drive signals wavy curve；A3 is that the 6th resistance and the 7th resistance are defeated to the first power supply
The signal gone out carries out the wavy curve after partial pressure；A4 is to believe through the first comparator D1 comparisons for postponing output
Number wavy curve；A5 is cursor interval, represents the comparison signal of first comparator D1 outputs and through IGBT
The time difference for the IGBT drive signal trailing edges that drive signal input circuit 5 is exported.
When first switch pipe Q1 emitter stage level is high level, first switch pipe Q1 is opened, and first
The power supply signal of power supply VCC1 outputs passes through after the second diode D2 rectifications (logical just every negative),
5 volts of voltages are clamped to by clamp supply VDD and the 3rd diode D3, to ensure front stage circuit
Level magnitudes it is consistent.5 volts of voltages are given before the 8th resistance R8 and the second electric capacity C2 are constituted after clamper
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,
Discharged again after being full of.Wherein, through the first switch pipe Q1 signal waveform curves exported and through the second electricity
Hold C2, the signal waveform curve after the 3rd electric capacity C3 discharge and recharges as shown in figure 4, A6 is through the in Fig. 4
A7 is after the second electric capacity C2 discharge and recharges in the signal waveform curve of one switching tube Q1 outputs, Fig. 4
Signal waveform curve.
During electric discharge, the voltage of the second comparator U2 positive input is with discharge voltage by up to
Low change, in the voltage that reverse input end of the discharge voltage higher than the second comparator U2 is inputted, the second ratio
High level is exported compared with device U2, simulant electronic switch K1 the first input pin s1 and the first output pin da are not
Conducting, IGBT does not work；Wherein, the voltage of the second comparator U2 reverse input end input is by the tenth
Resistance R10 and the 11st resistance R11 partial pressures are obtained；When discharge voltage is less than the voltage of its reverse input end
When, the second comparator U2 is output as low, the outputs of simulant electronic switch K1 the first input pin s1 and first
Pin da is turned on, and now, drive signal is exported to IGBT, makes its work.Wherein, through the tenth resistance R10
With the 11st resistance R11 to the wavy curve after the second power supply VCC2 partial pressures and through the second comparator
The signal waveform curve of U2 outputs is as shown in figure 5, A6 is through the tenth resistance R10 and the 11st in Fig. 5
Resistance R11 is to the wavy curve after the second power supply VCC2 partial pressures；A9 is through the 9th electricity in Fig. 5
Hinder the signal waveform curve after R9 current limlitings, the 3rd electric capacity C3 discharge and recharges；A10 is through the second ratio in Fig. 5
The signal waveform curve exported compared with device U2, the wherein low-level pulse width shown in A10 wavy curves are to need
The low-level pulse width safety value wanted, such as 10 microseconds, as long as ensureing to carry out pulsewidth through the pulsewidth limiting circuit
The low-level pulse width of IGBT drive signals after limitation processing is more than or equal to low-level pulse width safety
Value, it is ensured that being entered in LC oscillatory processes by high pressure interval behind low pressure interval, just controls IGBT to open.
It is understood that being reduced to electric discharge to its discharge voltage since after the 3rd electric capacity C3 is fully charged
The time period t of second comparator U2 reverse reference voltage is the IGBT low level arteries and veins after pulsewidth limitation
The wide time, due to the growth of the time so that the low-level pulse width extension of drive signal, LC is ensured with this
Entered in oscillatory process by high pressure interval behind low pressure interval, just control IGBT to open, so as to avoid IGBT
Open and damage during LC oscillating circuits are in high pressure.
Wherein, Fig. 6 is wavy curve when IGBT drive signals input pulsewidth exception, and Fig. 7 is IGBT
Wavy curve when drive signal input pulsewidth is normal.Wherein, A11 is cursor, represents IGBT driving letters
Number low-level pulse width be more than low-level pulse width safety value, after the pulsewidth limiting circuit, its waveform
Curve is A12；A13 is cursor, represents that the low-level pulse width of IGBT drive signals is less than low-level pulse width
Safety value, after being adjusted by the pulsewidth limiting circuit, its wavy curve is A14.
In addition, can with further reference to shown in Fig. 8, in Fig. 8 A and B be IGBT drive signals and
The comparison of wave shape figure of IGBT oscillator signals, wherein A represents that the low-level pulse width of IGBT drive signals occurs
When abnormal (narrow), IGBT has been turned on during the high pressure in LC oscillatory processes；B represents to pass through
The pulsewidth limiting circuit of IGBT drive signals carries out low-level pulse width to IGBT drive signals in A and prolonged
Waveform after length.N1 represents IGBT waveforms in Fig. 8；N2 represents IGBT drive signals；T1 tables
Show normal low-level pulse width；T2 represents abnormal low-level pulse width；M1 is represented due to IGBT drive signals
Low-level pulse width is abnormal, and IGBT is opened during the high pressure in LC oscillatory processes；M2 is represented in exception
IGBT is opened after the t3 times are extended in low-level pulse width.The B in Fig. 8, due in abnormal IGBT
The t3 times are added on the low-level pulse width t2 of drive signal so that IGBT locates in LC oscillatory processes
Just it is opened during low pressure, thus avoids IGBT collector voltage too high and damage IGBT, is realized
IGBT protected.
The present invention also provides a kind of electromagnetic heater, and the electromagnetic heater can be electric cooker, electromagnetism
The electric equipments such as stove, electric pressure cooking saucepan.In one embodiment, the electromagnetic heater drives including above-mentioned IGBT
The pulsewidth limiting circuit of dynamic signal；It is understood that above-mentioned due to having been used in electromagnetic heater
The pulsewidth limiting circuit of IGBT drive signals, therefore, the embodiment of the electromagnetic heater is including above-mentioned
Whole technical schemes of the pulsewidth limiting circuit whole embodiments of IGBT drive signals, and the technology reached
Effect is also identical, will not be repeated here.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention,
It is every the present invention inventive concept under, the equivalent structure made using description of the invention and accompanying drawing content
Conversion, or directly/the patent protection model that other related technical fields are included in the present invention is used in indirectly
In enclosing.
Claims (11)
1. a kind of pulsewidth limiting circuit of IGBT drive signals, it is characterised in that including for inputting
The IGBT drive signals input circuits of IGBT drive signals, trailing edge triggers circuit, delay control circuit,
Analog switching circuit, the input of the trailing edge triggers circuit inputs electricity with the IGBT drive signals
The output end connection on road, the output end of the trailing edge triggers circuit and the input of the delay control circuit
End connection, the output end of the delay control circuit is connected with the controlled end of the analog switching circuit, institute
The input for stating analog switching circuit is connected with the output end of the IGBT drive signals input circuit, institute
State the output end of analog switching circuit and IGBT driven moved end is connected；
The trailing edge triggers circuit, for the IGBT inputted in the IGBT drive signals input circuit
When drive signal is in trailing edge, trailing edge pulse signal is exported；
The delay control circuit, for receiving the trailing edge pulse signal, and carries out energy storage and electric discharge,
When discharge voltage is higher than preset voltage value, the first control signal is exported, in discharge voltage less than described pre-
If during magnitude of voltage, exporting the second control signal；
The analog switching circuit, for when receiving first control signal, controlling its input
Disconnected with output end, stopping exports the IGBT drive signals to IGBT, is receiving described second
Control its input and output end to connect during control signal, by the IGBT drive signals export to
IGBT。
2. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 1, it is characterised in that
The trailing edge triggers circuit includes trailing edge detection module, switching output module and Voltage stabilizing module, described
The test side of trailing edge detection module is the input of the trailing edge triggers circuit, the trailing edge detection
The output end of module is connected with the controlled end of the switching output module, the output of the switching output module
End is connected with the input of the Voltage stabilizing module, and the output end of the Voltage stabilizing module triggers for the trailing edge
The output end of circuit；
Wherein, the trailing edge detection module, for detecting the IGBT drive signals input electricity
When the IGBT drive signals of road input are in trailing edge, the switching output module is controlled to open；
The switching output module, for when opening, exporting first voltage signal；
The Voltage stabilizing module, the amplitude of the first voltage signal for being exported to the switching output module is entered
Row is limited, to export the trailing edge pulse signal.
3. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 2, it is characterised in that
The trailing edge detection module includes the first diode, first resistor, second resistance, the first electric capacity and the
One comparator；The anode of first diode is the test side of the trailing edge detection module, described the
The negative electrode of one diode is connected with the first end of the first resistor, the second end difference of the first resistor
The forward direction of first end, the first end of first electric capacity and the first comparator with the second resistance
Input is connected, the second end ground connection of the second end of the second resistance and first electric capacity；Described
The reverse input end of one comparator inputs first voltage reference signal, and the output end of the first comparator is
The output end of the trailing edge detection module.
4. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 2, it is characterised in that
The switching output module includes first switch pipe, 3rd resistor, the 4th resistance and the first power supply,
The emitter stage of the first switch pipe is connected through the 3rd resistor with first power supply, and described
One end that the emitter stage of one switching tube is connected with the 3rd resistor is controlled for the switching output module
End, the colelctor electrode of the first switch pipe is connected with one end of the 4th resistance, the 4th resistance
Second end is grounded, and one end of the first switch pipe and the 4th resistive interconnections is the switch output mould
The output end of block, the base stage of the first switch pipe and the output of the IGBT drive signals input circuit
End connection.
5. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 2, it is characterised in that
The Voltage stabilizing module includes clamp supply, the second diode and the 3rd diode, second diode
Anode is the input of the Voltage stabilizing module, the negative electrode of second diode and the 3rd diode
Anode is connected, and the negative electrode of the 3rd diode is connected with the clamp supply, second diode and
One end of the 3rd diode interconnection is the output end of the Voltage stabilizing module.
6. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 1, it is characterised in that
The IGBT drive signals input circuit include be used for input IGBT drive signals signal input part,
5th resistance and voltage-stabiliser tube, the first end of the 5th resistance are connected with the signal input part, and described
Second end of five resistance and the negative electrode of the voltage-stabiliser tube, the base stage of the first switch pipe and first electricity
The first end of resistance is connected respectively, the plus earth of the voltage-stabiliser tube；Second end of the 5th resistance and institute
The one end for stating the negative electrode interconnection of voltage-stabiliser tube is the output end of IGBT drive signal input circuits.
7. the pulsewidth limiting circuit of the IGBT drive signals as described in claim 1 to 6 any one,
Characterized in that, the delay control circuit includes charge-discharge modules and comparison module, the discharge and recharge mould
The input of block is the input of delay control circuit, and the output end of the charge-discharge modules is compared with described
The positive input connection of module；The reverse input end of the comparison module inputs the second reference voltage signal,
The output end of the comparison module is the output end of the delay control circuit.
8. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 7, it is characterised in that
The charge-discharge modules include the 8th resistance and the second electric capacity in parallel, and the 9th resistance connected
With the 3rd electric capacity, one of public connecting end of the 8th resistance and the second electric capacity is the discharge and recharge
The input of module, and be connected with the free connection end of the 9th resistance, the 8th resistance and second
The free connection end of another public connecting end of electric capacity and the 3rd electric capacity is grounded simultaneously, and the described 9th
The public connecting end of resistance and the 3rd electric capacity is the output end of the charge-discharge modules.
9. the pulsewidth limiting circuit of IGBT drive signals as claimed in claim 7, it is characterised in that
The comparison module include the second power supply, the second comparator, be connected on second power supply and
The tenth resistance and the 11st resistance between ground connection, and it is connected to second power supply and the second ratio
Compared with the 12nd resistance between device output end；It is commonly connected between tenth resistance and the 11st resistance
Hold to the reverse input end of the comparison module and input the second reference voltage signal；Second comparator
Positive input is the positive input of the comparison module, and the output end of second comparator is described
The output end of comparison module.
10. the pulsewidth limiting circuit of the IGBT drive signals as described in claim 1 to 6 any one,
Characterized in that, the analog switching circuit includes the 3rd power supply, simulant electronic switch and the 13rd
Resistance, the simulant electronic switch includes supply pin, the first input pin, the first output pin, control first
The the first controlled pin and grounding leg for connecting or cutting off between input pin and the first output pin, the simulation electricity
The supply pin of sub switch is connected with the 3rd power supply, the first end of the 13rd resistance with it is described
The first input pin connection of simulant electronic switch, the second end of the 13rd resistance is the analog switch
The input of circuit, the first output pin of the simulant electronic switch is the output of the analog switching circuit
End, the first controlled pin of the simulant electronic switch is the controlled end of the analog switching circuit, the mould
Intend the grounding leg ground connection of electronic switch.
11. a kind of electromagnetic heater, it is characterised in that including such as claim 1 to 10 any one
The pulsewidth limiting circuit of described IGBT drive signals.
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| CN201610070076.0A CN107026639B (en) | 2016-01-29 | 2016-01-29 | Pulse width limiting circuit of IGBT driving signal and electromagnetic heating device |
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| CN201610070076.0A CN107026639B (en) | 2016-01-29 | 2016-01-29 | Pulse width limiting circuit of IGBT driving signal and electromagnetic heating device |
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| CN107026639B CN107026639B (en) | 2023-04-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110557014A (en) * | 2019-10-16 | 2019-12-10 | 上海沪工焊接集团股份有限公司 | Wide voltage power factor correction circuit |
| CN112152593A (en) * | 2020-09-18 | 2020-12-29 | 深圳瑞波光电子有限公司 | Drive circuit and laser device |
| CN112952927A (en) * | 2019-12-11 | 2021-06-11 | 台达电子工业股份有限公司 | Duty cycle limiting circuit, power supply with same and operation method of power supply |
| CN114571720A (en) * | 2022-01-25 | 2022-06-03 | 深圳市纵维立方科技有限公司 | Photocuring printer |
| CN112152593B (en) * | 2020-09-18 | 2024-05-10 | 深圳瑞波光电子有限公司 | Driving circuit and laser device |
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| JP2001157443A (en) * | 2000-11-21 | 2001-06-08 | Taiyo Yuden Co Ltd | Pulse control circuit and synchronous rectifying circuit |
| CN101651421A (en) * | 2009-09-28 | 2010-02-17 | 江苏技术师范学院 | Power supply driving circuit |
| CN103840642A (en) * | 2012-11-27 | 2014-06-04 | 美的集团股份有限公司 | Electromagnetic heating device and drive circuit thereof |
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| JP2001157443A (en) * | 2000-11-21 | 2001-06-08 | Taiyo Yuden Co Ltd | Pulse control circuit and synchronous rectifying circuit |
| CN101651421A (en) * | 2009-09-28 | 2010-02-17 | 江苏技术师范学院 | Power supply driving circuit |
| CN103840642A (en) * | 2012-11-27 | 2014-06-04 | 美的集团股份有限公司 | Electromagnetic heating device and drive circuit thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557014A (en) * | 2019-10-16 | 2019-12-10 | 上海沪工焊接集团股份有限公司 | Wide voltage power factor correction circuit |
| CN112952927A (en) * | 2019-12-11 | 2021-06-11 | 台达电子工业股份有限公司 | Duty cycle limiting circuit, power supply with same and operation method of power supply |
| CN112952927B (en) * | 2019-12-11 | 2024-02-13 | 台达电子工业股份有限公司 | Duty cycle limiting circuit, power supply with same and operation method thereof |
| CN112152593A (en) * | 2020-09-18 | 2020-12-29 | 深圳瑞波光电子有限公司 | Drive circuit and laser device |
| CN112152593B (en) * | 2020-09-18 | 2024-05-10 | 深圳瑞波光电子有限公司 | Driving circuit and laser device |
| CN114571720A (en) * | 2022-01-25 | 2022-06-03 | 深圳市纵维立方科技有限公司 | Photocuring printer |
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| Publication number | Publication date |
|---|---|
| CN107026639B (en) | 2023-04-25 |
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