CN104009615B - Bridge switch control circuit and its operational approach - Google Patents
Bridge switch control circuit and its operational approach Download PDFInfo
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- CN104009615B CN104009615B CN201310057049.6A CN201310057049A CN104009615B CN 104009615 B CN104009615 B CN 104009615B CN 201310057049 A CN201310057049 A CN 201310057049A CN 104009615 B CN104009615 B CN 104009615B
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Abstract
The invention discloses a kind of bridge switch control circuit and its operational approach, control at least one complementary switch right, comprise the steps of.First, one first drive signal, one second drive signal, one first latch-up signal and one second latch-up signal are provided, wherein this first drive signal and this second drive signal drives this at least one complementary switch right respectively.Then, judge whether this first drive signal is positive edge triggering.If this first drive signal triggers for positive edge, control this first latch-up signal to be high level, control this second latch-up signal to be low level simultaneously.Then, judge whether this second drive signal is positive edge triggering.If this second drive signal triggers for positive edge, control this second latch-up signal to be high level, control this first latch-up signal to be low level simultaneously.
Description
Technical field
About a kind of bridge switch control circuit and its operational approach, espespecially a kind of have staggered handoff functionality to the present invention
Bridge switch control circuit and its operational approach.
Background technology
Additionally, in power switch switching circuit, because power switch has on-delay (turn-on delay) and cuts
Only postpone the non-ideal phenomenon of (turn-off delay), therefore, in fact, power switch can't be after inputting commands to reach
On or off immediately.Situation about being short-circuited under non-fully on or off state in order to avoid two crystal on same arm,
Need stagger in the middle of the conducting of upper underarm crystal with cut-off, postpone a period of time, this time is referred to as Dead Time (dead
Time) or claim short circuit prevent the time.Additionally, it is by the wink ending to conducting by each power switch that short circuit prevents the way of time
Between postpone the time backward, and the time size that this postpones must coordinate the switch speed of switch.
Refer to Figure 1A, be the half bridge circuit framework circuit diagram of prior art.For convenience of explanation, synchronous whole to have
As a example the transducer of flow control.This transducer has a transformator, and the secondary side of this transformator is with two metal-oxides
Semiconductcor field effect transistor (MOSFET) is switch element, respectively one first switch Q1 and a second switch Q2, and wherein, this
One switch Q1 is that complementation replaces switching with this second switch Q2, that is, when this first switch Q1 turns on, this second switch Q2 is then
Cut-off, conversely, when this first switch Q1 is ended, this second switch Q2 then turns on.Cooperation, referring to Figure 1B, is that prior art one is short
Road prevents the time schematic diagram of (dead time).From the above, when switching over control, in order to prevent this first switch Q1
With this second switch Q2 because simultaneously turning on, and short circuit is caused to puncture the situation of (short through), therefore, in two switches
Conducting and cut-off hand over more place all to provide a short circuit to prevent time td.As shown in Figure 1B, time t1 to time t2, time t3 are to the time
T4 and time t5 prevents time td to time t6 for this short circuit.Only, if shortening this short circuit to prevent time td, effective work will be increased
Make the cycle, but be easily equally short-circuited and puncture situation because of the unreasonably characteristic of noise jamming or switch element itself；If conversely,
Increasing this short circuit prevents time td although the probability puncturing situation generation can be improved, but the plurality of switch is in cut out
The ratio that time accounts for the whole switching cycle time increases, and leads to overall transformation efficiency to decline.
Referring to Fig. 1 C, it is the schematic diagram that another short circuit of prior art prevents the time (dead time).In the prior art,
It is simultaneously turn on to be short-circuited with this second switch Q2 with this first switch Q1 to puncture, therefore it was also proposed that protection mechanism
Solution.As shown in Figure 1 C, when time t3 to time t4 occurs noise SnInterference, now, control system can forced closing be somebody's turn to do
One first drive signal S of first switch Q1gl, after noise eliminates, control system can be due to minimum ON time
(minimum on time) mechanism start, send again because front forced closing and do not transmitted this first drive signal Sg1's
Undone turn-on action.Therefore, once complementary replace the one second drive signal S switchingg2Continue conducting when, by occur this first
Switch Q1 and this second switch Q2 simultaneously turns on and causes short-circuit situation about puncturing so that power switch component permanent damage, enters
And allow generation reliability to be greatly reduced.
Therefore, how to design a kind of bridge switch control circuit and its operational approach, can be applicable to semibridge system and full-bridge
The circuit of formula topology framework is so that two power switch loops will cause short circuit to puncture (short because of simultaneously turning on
Through) situation occurs, and improves circuit reliability and noise immunity ability, is to be intended to row by inventor to overcome simultaneously
The big problem solved.
Content of the invention
One purpose of the present invention is to provide a kind of operational approach of bridge switch control circuit, to overcome prior art
Problem.The operational approach of bridge switch control circuit therefore of the present invention comprises the steps of：(a) offer one first drive signal,
One second drive signal, one first latch-up signal and one second latch-up signal, wherein this first drive signal and this second drive
Dynamic signal drives the multiple switch of at least one complementary switch centering respectively；B () judges whether this first drive signal is positive edge
Trigger this at least one complementary switch to a switch；If c () this first drive signal triggers this for positive edge at least one complementary
Switch to this switch, then control this first latch-up signal be high level, control simultaneously this second latch-up signal be low level；
(d) judge this second drive signal be whether positive edge trigger this at least one complementary switch to another switch；And if (e) is somebody's turn to do
Second drive signal for positive edge trigger this at least one complementary switch to this another switch, then control this second latch-up signal to be
High level, controls this first latch-up signal to be low level simultaneously.
Another object of the present invention is to providing a kind of bridge switch control circuit, to overcome problem of the prior art.Cause
This bridge switch control circuit of the present invention comprises a bridge circuit and a control module.It is complementary that this bridge circuit comprises at least one
Switch is right, and this at least one complementary switch is to being controlled by two drive signals respectively.This control module comprise a judging unit with
One latch lock unit.This judging unit according to this at least one complementary switch to voltage across poles size, judge that this is at least one complementary
Formula switch to conducting and cut-off state, and corresponding produce two output signals.This latch lock unit receives this two output signal, and
And provide latch operations according to the level of this two output signal, with corresponding output two latch-up signals.Wherein, if this drive signal is
Positive edge trigger this at least one complementary switch to a switch, then control this corresponding latch-up signal to be high level, same to time control
Make another latch-up signal be low level so that this at least one complementary switch to this switch be conducting state, and another switch
For cut-off state, to prevent this at least one complementary switch from causing short-circuit condition to simultaneously turning on.
In order to be able to be further understood that the present invention is to reach technology, means and effect that predetermined purpose is taken, refer to
Below in connection with detailed description of the invention and accompanying drawing it is believed that the purpose of the present invention, feature and feature, when can thus one deeply and
Specific understanding, but institute's accompanying drawings only provide with reference to and illustrate to use, and are not used for the present invention person of being any limitation as.
Brief description
Figure 1A is the half bridge circuit framework circuit diagram of prior art；
Figure 1B prevents the time schematic diagram of (dead time) for prior art one short circuit；
Fig. 1 C prevents the time schematic diagram of (deadtime) for another short circuit of prior art；
The flow chart that Fig. 2 has the bridge switch control circuit operational approach of staggered handoff functionality for the present invention；
Fig. 3 A has the letter of the bridge switch control circuit operational approach first embodiment of staggered handoff functionality for the present invention
Number waveform diagram；
Fig. 3 B has the letter of the bridge switch control circuit operational approach second embodiment of staggered handoff functionality for the present invention
Number waveform diagram；
Fig. 3 C has the letter of the bridge switch control circuit operational approach 3rd embodiment of staggered handoff functionality for the present invention
Number waveform diagram；
Fig. 3 D has the letter of the bridge switch control circuit operational approach fourth embodiment of staggered handoff functionality for the present invention
Number waveform diagram；
The circuit box that Fig. 4 A has the bridge switch control circuit first embodiment of staggered handoff functionality for the present invention shows
It is intended to；
The circuit box that Fig. 4 B has the bridge switch control circuit second embodiment of staggered handoff functionality for the present invention shows
It is intended to；And
Fig. 5 has the circuit diagram of a latch lock unit of bridge switch control circuit of staggered handoff functionality for the present invention.
Wherein, description of reference numerals is as follows：
Prior art
Sg1First drive signal
Sg2Second drive signal
SnNoise
Q1 first switch
Q2 second switch
Td short circuit prevents the time
T1～t8 time
Vin input voltage
Vout output voltage
The present invention
S10～S22 step
SGD1First drive signal
SGD2Second drive signal
SLH1First latch-up signal
SLH2Second latch-up signal
SnNoise
T1～t8 time
Td short circuit prevents the time
Q1 first switch
Q2 second switch
Q3 the 3rd switchs
Q4 the 4th switchs
Qa1 first switch group
Qa2 second switch group
10 half bridge circuit frameworks
30 full bridge circuit frameworks
20 control modules
2011 first amplification voltage cell
2012 second amplification voltage cell
2021 first comparing units
2022 second comparing units
203 judging units
204 latch lock units
2041 nor gates
2042 nor gates
Vds1 drain-source voltage
Vds2 drain-source voltage
Vds1 ' amplifies drain-source voltage
Vds2 ' amplifies drain-source voltage
Vref1 first reference voltage
Vref2 second reference voltage
S1 first output signal
S2 second output signal
Vin input voltage
Vout output voltage
Specific embodiment
Hereby the technical content and a detailed description for the present invention, cooperation schema is described as follows：
Refer to Fig. 2, be the flow chart of the bridge switch control circuit operational approach that the present invention has staggered handoff functionality.
The operational approach that this has the bridge switch control circuit of staggered handoff functionality comprises the steps of：First, one first drive is provided
Dynamic signal SGD1, one second drive signal SGD2, one first latch-up signal SLH1And one second latch-up signal SLH2, wherein this first
Drive signal SGD1With this second drive signal SGD2Drive at least one complementary switch respectively to (complementary switch
pair)(S10).Then, judge this first drive signal SGD1Whether it is that positive edge triggering (rising-edge triggering) should
At least one complementary switch to one switch (S12).If this first drive signal SGD1Trigger this for positive edge at least one complementary to open
Close to this switch, then control this first latch-up signal SLH1For high level, control this second latch-up signal S simultaneouslyLH2For low electricity
Flat (S14), and maintain this first latch-up signal SLH1With this second latch-up signal SLH2It is respectively high level and low level
(S16).Then, judge this second drive signal SGD2Whether it is that this is at least for positive edge triggering (rising-edge triggering)
One complementary switch to another switch (S18).If this second drive signal SGD2Trigger this at least one complementary switch for positive edge
To this another switch, then control this second latch-up signal SLH2For high level, control this first latch-up signal S simultaneouslyLH1For low
Level (S20), and maintain this second latch-up signal SLH2With this first latch-up signal SLH1It is respectively high level and low level
(S22).In step (S12), if this first drive signal SGD1Non- for positive edge trigger this at least one complementary switch to this open
Close, then execution step (S22), that is, maintain this second latch-up signal SLH2With this first latch-up signal SLH1It is respectively high level
With low level.In step (S18), if this second drive signal SGD2Non- for positive edge trigger this at least one complementary switch to
This another switch, then execution step (S16), that is, maintain this first latch-up signal SLH1With this second latch-up signal SLH2Respectively
For high level and low level.As for the explanation of this bridge switch control circuit operational approach, by there being detailed elaboration hereinafter.
Cooperation, referring to Fig. 3 A, is bridge switch control circuit operational approach first reality that the present invention has staggered handoff functionality
Apply the signal waveform schematic diagram of example.As time t1, this first drive signal SGD1Trigger this at least one complementary switch for positive edge
To a switch, therefore, control this first latch-up signal SLH1It is high level by low transition, control this second breech lock simultaneously
Signal SLH2Low level is converted to by high level.As time t2, this second drive signal SGD2Trigger this for positive edge at least one mutual
Benefit formula switch to another switch, therefore, control this second latch-up signal SLH2It is high level by low transition, control simultaneously
This first latch-up signal SLH1Low level is converted to by high level.Wherein, this at least one complementary switch is to for metal-oxide partly
Conductor field-effect transistor (metal-oxide-semiconductor field effect transistor, MOSFET) or exhausted
Edge grid bipolar transistor (insulated gate bipolar transistor, IGBT), but be not limited.
If additionally, this first drive signal SGD1Non- for positive edge trigger this at least one complementary switch to this switch (also
That is, before time t1 or between time t2 to time t3, this first drive signal SGD1For low level), then maintain this first breech lock
Signal SLH1With this second latch-up signal SLH2It is respectively low level and high level.If this second drive signal SGD2Non- tactile for positive edge
Send out this at least one complementary switch to this another switch (that is, between time t1 to time t2 or after time t3, this second
Drive signal SGD2For low level), then maintain this first latch-up signal SLH1With this second latch-up signal SLH2Be respectively high level with
Low level.
Cooperation, referring to Fig. 3 B, is bridge switch control circuit operational approach second reality that the present invention has staggered handoff functionality
Apply the signal waveform schematic diagram of example.The maximum difference of second embodiment and first embodiment is in second embodiment, more can be
This first drive signal SGD1With the second drive signal SGD2The border of the switching of on or off interaction each time, when adding short circuit to prevent
Between (dead time).Therefore, as shown in Figure 3 B, time t1 to time t2, time t3 are to time t4 and time t5 to time t6
Prevent time td for this short circuit.Similarly, as time t2, this first drive signal SGD1Trigger this at least one complementation for positive edge
Formula switch to a switch, therefore, control this first latch-up signal SLH1Be high level by low transition, control simultaneously this
Two latch-up signal SLH2Low level is converted to by high level.It is worth mentioning, in the present embodiment, during due to adding this short circuit to prevent
Between td, therefore, this second latch-up signal SLH2When time t1, this short circuit prevents time td to be converted into low level after starting.
In other words, if because the unreasonably characteristic of noise jamming or switch element itself leads to this second latch-up signal SLH2Cannot be short in this
When road prevents time td from starting when being converted into low level, will equally can be because of this first drive signal SGD1For positive edge triggering
Control this second latch-up signal S simultaneouslyLH2Low level is converted to by high level.As for noise jamming, this bridge switch is controlled
The explanation of circuit operation method, will have detailed elaboration in (3rd embodiment and fourth embodiment) hereinafter.In the same manner, as time t4
When, this second drive signal SGD2For positive edge trigger this at least one complementary switch to another switch, therefore, control this second
Latch-up signal SLH2It is high level by low transition, control this first latch-up signal S simultaneouslyLH1Low electricity is converted to by high level
Flat.It is worth mentioning, in the present embodiment, due to adding this short circuit to prevent time td, therefore, this first latch-up signal SLH1In
During time t3, this short circuit prevents time td to be converted into low level after starting.In other words, if due to noise jamming or switch element
The unreasonably characteristic of itself leads to this first latch-up signal SLH1Time td cannot be prevented to be converted into low level when starting in this short circuit
When, will equally can be because of this second drive signal SGD2Control this first latch-up signal S for positive edge triggering simultaneouslyLH1By high level
Be converted to low level.As for noise jamming for this bridge switch control circuit operational approach explanation, will be in (the 3rd is real hereinafter
Apply example and fourth embodiment) there is detailed elaboration.
If additionally, this first drive signal SGD1Non- for positive edge trigger this at least one complementary switch to this switch (also
That is, between the front or time t4 to time t5 of time t1, this first drive signal SGD1For low level), then maintain this first breech lock
Signal SLH1With this second latch-up signal SLH2It is respectively low level and high level.Should for positive edge triggering if this second drive signal is non-
At least one complementary switch to this another switch (that is, between time t2 to time t3 or after time t6, this second driving
Signal SGD2For low level), then maintain this first latch-up signal SLH1With this second latch-up signal SLH2It is respectively high level and low electricity
Flat.
Cooperation, referring to Fig. 3 C, is bridge switch control circuit operational approach the 3rd reality that the present invention has staggered handoff functionality
Apply the signal waveform schematic diagram of example.The maximum difference of 3rd embodiment and first embodiment be in the third embodiment, when
Between t2 to time t3 and time t5 have noise S respectively to time t6nInterference.As time t1, this first drive signal SGD1For
Positive edge trigger this at least one complementary switch to a switch, therefore, control this first latch-up signal SLH1By low transition it is
High level, controls this second latch-up signal S simultaneouslyLH2Low level is converted to by high level.As time t2, due to this noise Sn
Interference produces, therefore, this first drive signal SGD1Then force to be converted to low level by high level, but this first latch-up signal
SLH1Still maintain high level.Also due to this first latch-up signal SLH1Still maintain high level, therefore, this first drive signal SGD1Will
By breech lock, and again high level cannot be converted to by positive edge triggering.As time t3, this noise SnInterference eliminates, but due to this
First latch-up signal SLH1Still maintain high level, therefore, this first drive signal SGD1Persistently it is subject to breech lock.Until time t4, should
Second drive signal SGD2For positive edge trigger this at least one complementary switch to another switch, therefore, control this second breech lock believe
Number SLH2It is high level by low transition, control this first latch-up signal S simultaneouslyLH1Low level is converted to by high level.At that time
Between t5 when, due to this noise Sn disturb produce, therefore, this second drive signal SGD2 then forces to be converted to low electricity by high level
Flat, but this second latch-up signal SLH2 still maintains high level.Also due to this second latch-up signal SLH2 still maintains high level, because
This, this second drive signal SGD2 by breech lock, and will cannot be converted to high level by positive edge triggering again.As time t6, should
Noise Sn interference eliminates, but because this second latch-up signal SLH2 still maintains high level, therefore, this second drive signal SGD2 holds
Continue and be subject to breech lock.
Cooperation, referring to Fig. 3 D, is bridge switch control circuit operational approach the 4th reality that the present invention has staggered handoff functionality
Apply the signal waveform schematic diagram of example.The maximum difference of fourth embodiment and 3rd embodiment be in the fourth embodiment, when
Between t2 to time t4 and time t6 to time t8 have respectively noise Sn disturb, and noise Sn interference persistent period longer.
As time t1, this first drive signal SGD1 for positive edge trigger this at least one complementary switch to this switch, therefore, control
This first latch-up signal SLH1 is high level by low transition, controls this second latch-up signal SLH2 to be changed by high level simultaneously
For low level.As time t2, produce because this noise Sn disturbs, therefore, this first drive signal SGD1 then forces by high electricity
Flat turn is changed to low level, but this first latch-up signal SLH1 still maintains high level.Also due to this first latch-up signal SLH1 is still
Maintain high level, therefore, this first drive signal SGD1 by breech lock, and will cannot be converted to high level by positive edge triggering again.
As time t3, this second drive signal SGD2 for positive edge trigger this at least one complementary switch to this another switch, therefore,
Control this second latch-up signal SLH2 to be high level by low transition, control this first latch-up signal SLH1 by high level simultaneously
Be converted to low level.But because this noise Sn disturbs sustainable existence, therefore, after the triggering of this second drive signal SGD2 positive edge at once
Be converted to low level.Also due to this second latch-up signal SLH2 still maintains high level, therefore, this second drive signal SGD2 will be subject to
To breech lock, and again high level cannot be converted to by positive edge triggering.As time t4, this noise Sn interference eliminates, but due to this
Two latch-up signal SLH2 still maintain high level, and therefore, this second drive signal SGD2 is persistently subject to breech lock.
As time t5, this second drive signal SGD2 for positive edge trigger this at least one complementary switch to this another open
Close, therefore, control this second latch-up signal SLH2 to be high level by low transition, control this first latch-up signal SLH1 simultaneously
Low level is converted to by high level.As time t6, produce because this noise Sn disturbs, therefore, this second drive signal SGD2
Then force to be converted to low level by high level, but this second latch-up signal SLH2 still maintains high level.Also due to this second door bolt
Lock signal SLH2 still maintains high level, and therefore, this second drive signal SGD2 by breech lock, and cannot will be turned by positive edge triggering again
It is changed to high level.As time t7, this first drive signal SGD1 for positive edge trigger this at least one complementary switch to this open
Close, therefore, control this first latch-up signal SLH1 to be high level by low transition, control this second latch-up signal SLH2 simultaneously
Low level is converted to by high level.But because this noise Sn disturbs sustainable existence, therefore, this first drive signal SGD1 positive edge is touched
At once low level is converted to after sending out.Also due to this first latch-up signal SLH1 still maintains high level, therefore, this first drive signal
SGD1 by breech lock, and will cannot be converted to high level by positive edge triggering again.As time t8, this noise Sn interference eliminates, but
Because this first latch-up signal SLH1 still maintains high level, therefore, this first drive signal SGD1 is persistently subject to breech lock.
To sum up described in these embodiments, when being triggered for positive edge by this first drive signal SGD1, except controlling homophase to be somebody's turn to do
First latch-up signal SLH1 is high level by low transition, can set outside breech lock to this first drive signal SGD1, also same
When control anti-phase this second latch-up signal SLH2 to be converted to low level by high level, this second drive signal SGD2 can be released
Breech lock.In the same manner, when being triggered for positive edge by this second drive signal SGD2, except control homophase this second latch-up signal SLH2 by
Low transition is high level, and this second drive signal SGD2 can be set outside breech lock, also controls this first door bolt anti-phase simultaneously
Lock signal SLH1 is converted to low level by high level, can release breech lock to this first drive signal SGD1.So, by this first
The positive edge triggering offer homophase of drive signal SGD1 and this second drive signal SGD2 and the setting of anti-phase latch-up signal and solution
Remove, with reach control interlaced with each other (interacting control) once operational approach so that this first drive signal
After the corresponding switch conduction that SGD1 is driven, another switch (being driven by this second drive signal SGD2) is then cut-off shape
State, anti-, after the corresponding switch conduction that this second drive signal SGD2 is driven, another switch (first is driven by this
Signal SGD1 is driven) it is then cut-off state, therefore, this two switch will not occur because simultaneously turning on, and causes short circuit to hit
Situation about wearing.
Hereinafter, cooperation circuit embodiments are illustrated that this has the operation side of the bridge switch control circuit of staggered handoff functionality
Method, but non-be limited with this circuit embodiments.Refer to the bridge switch control electricity that Fig. 4 A has staggered handoff functionality for the present invention
The circuit box schematic diagram of road first embodiment.In the first embodiment, this bridge switch control circuit comprises a semibridge system electricity
Road framework (half-bridge circuit) 10 and a control module 20.This pair complementary switch switchs for two, respectively
One first switch Q1 and a second switch Q2.Wherein, this at least one complementary switch is to brilliant for metal oxide semiconductcor field effect
Body pipe (metal-oxide-semiconductor field effect transistor, MOSFET) or insulated gate bipolar are brilliant
Body pipe (insulated gate bipolar transistor, IGBT), but be not limited.This first drive signal SGD1
Drive this first switch Q1 and this second switch Q2 with this second drive signal SGD2 respectively.This control module 20 comprises one first
Amplify voltage cell 2011, one second and amplify voltage cell 2012, one first comparing unit 2021, one second comparing unit
2022nd, a judging unit 203 and a latch lock unit 204.This first amplification voltage cell 2011 and this second amplification voltage cell
The drain-source voltage Vds2 of the 2012 drain-source voltage Vds1 and this second switch Q2 receiving this first switch Q1 respectively, and should
Two drain-source voltage Vds1, Vds2 amplify, to respectively obtain two amplification drain-source voltage Vds1 ', Vds2 '.Then, this amplification leakage
Source voltage Vdsl ' passes through this first comparing unit 2021 and one first reference voltage Vref 1 comparison voltage size, if this amplification
Drain-source voltage Vds1 ' be more than this first reference voltage Vref 1, then export high level, represent this first switch Q1 by this first
Drive signal SGD1 is triggered and is turned on, conversely, then exporting low level；This amplification drain-source voltage Vds2 ' passes through this second to be compared
Compared with unit 2022 and one second reference voltage Vref 2 comparison voltage size, if this amplification drain-source voltage Vds2 ' more than this second
Reference voltage Vref 2, then export high level, represent that this second switch Q2 is triggered and turned on by this second drive signal SGD2,
Conversely, then exporting low level.
This judging unit 203 receives the output letter of this first comparing unit 2021 and this second comparing unit 2022 respectively
Number, judge conducting and the cut-off state of this first switch Q1 and this second switch Q2, and export one first output signal S1 and one
Second output signal S2.It is worth mentioning, when this first output signal S1 is high level then it represents that this first drive signal SGD1
Trigger this first switch Q1 for positive edge, that is, this first drive signal SGD1 is high level just by low transition；When this second
Output signal S2 is then it represents that this second drive signal SGD2 triggers this second switch Q2 for positive edge during high level, that is, this
Two driving signal SGD2 is high level just by low transition.This latch lock unit 204 receive this first output signal S1 with this
Two output signals S2, and provide latch operations according to the level of this first output signal S1 and this second output signal S2, with defeated
Go out this first latch-up signal SLH1 and this second latch-up signal SLH2.From the above, if this first drive signal SGD1 is high electricity
Flat and when this second drive signal SGD2 is low level, then control this first latch-up signal SLH1 to be high level, control simultaneously
This second latch-up signal SLH2 is low level so that this first switch Q1 turns on and this second switch Q2 cut-off, to prevent this
First switch Q1 and this second switch Q2 simultaneously turn on and cause short-circuit condition.Anti-, if this second drive signal SGD2 is high electricity
Flat and when this first drive signal SGD1 is low level, then control this second latch-up signal SLH2 to be high level, control simultaneously
This first breech lock letter SLH1 is low level so that this second switch Q2 conducting and the cut-off of this first switch Q1, with prevent this
Two switch Q2 are simultaneously turned on this first switch Q1 and cause short-circuit condition.
Refer to the bridge switch control circuit first embodiment and second that Fig. 4 B has staggered handoff functionality for the present invention
The circuit box schematic diagram of embodiment.The second embodiment difference maximum with first embodiment is in a second embodiment, should
Bridge switch control circuit comprises a full bridge circuit framework (full-bridge circuit) 30 and a control module 20.Should
Two pairs complementary to switch and switchs for four, respectively one first switch Q1, a second switch Q2, one the 3rd switch Q3 and 1 the
Four switch Q4.Wherein, first switch group Qa1 that this first switch Q1 simultaneously turns on or ends with the 4th switch Q4 formation,
Second switch group Qa2 that this second switch Q2 simultaneously turns on or ends with the 3rd switch Q3 formation.This first drive signal
SGD1 and this second drive signal SGD2 drives this first switch group Qa1 and this second switch group Qa2 respectively.Below only real with regard to two
The deviation applying example illustrates, and remaining repeats no more, and refers to Fig. 4 A and its explanation.This first amplify voltage cell 2011 with
This second amplification voltage cell 2012 receives this first switch Q1 of this first switch group Qa1 or the leakage of the 4th switch Q4 respectively
The drain-source voltage Vds1 of source voltage Vds2 and this second switch Q2 or the 3rd switch Q3 of this second switch group Qa2, and
By this two drain-source voltage Vds1, Vds2 amplifies, to respectively obtain two amplification drain-source voltage Vds1 ', Vds2 '.Then, this is put
Big drain-source voltage Vds1 ' passes through this first comparing unit 2021 and one first reference voltage Vref 1 comparison voltage size, and this is put
Big drain-source voltage Vds2 ' passes through this second comparing unit 2022 and one second reference voltage Vref 2 comparison voltage size.
This judging unit 203 receives the output letter of this first comparing unit 2021 and this second comparing unit 2022 respectively
Number, judge conducting and the cut-off state of this first switch group Qa1 and this second switch group Qa2, and export one first output signal
S1 and one second output signal S2.It is worth mentioning, when this first output signal S1 is high level then it represents that this first driving is believed
Number SGD1 triggers the 4th switch Q4 for positive edge, that is, this first drive signal SGD1 is high level just by low transition；When
This second output signal S2 is then it represents that this second drive signal SGD2 triggers this second switch Q2 for positive edge, also during high level
I.e. this second drive signal SGD2 is high level just by low transition.This latch lock unit 204 receives this first output signal S1
With this second output signal S2, and provide breech lock behaviour according to the level of this first output signal S1 and this second output signal S2
Make, to export this first latch-up signal SLH1 and this second latch-up signal SLH2.From the above, if this first drive signal SGD1
When being low level for high level and this second drive signal SGD2, then this first latch-up signal SLH1 is controlled to be high level, with
When control this second latch-up signal SLH2 be low level so that the 4th switch Q4 conducting and this second switch Q2 cut-off, with
Prevent the 4th switch Q4 and this second switch Q2 from simultaneously turning on and cause short-circuit condition.Anti-, if this second drive signal SGD2
When being low level for high level and this first drive signal SGD1, then this second latch-up signal SLH2 is controlled to be high level, with
When control this first latch-up signal SLH1 be low level so that this second switch Q2 conducting and the 4th switch Q4 cut-off, with
Prevent this second switch Q2 from simultaneously turning on the 4th switch Q4 and cause short-circuit condition.As for this latch lock unit 204 operational approach
Explanation, by there being detailed elaboration hereinafter.
Refer to Fig. 5, be the electricity of a latch lock unit of the bridge switch control circuit that the present invention has staggered handoff functionality
Lu Tu.From the above, this latch lock unit 204 can be nor gate R-S latch unit (NOR R-S latch), NAND gate R-S latch unit
(NAND R-S latch), D type latch unit (D latch) or the latch circuit being made up of logic gate component.Say for convenience
Bright, in the present embodiment, and coordinate half bridge circuit framework 10 (referring to Fig. 4 A) in addition detailed taking nor gate R-S latch unit as a example
Explanation.This latch lock unit 204 is formed by connecting with two nor gates 2041,2042.When this first drive signal SGD1 touches for positive edge
When sending out this first switch Q1, for high level, this second output signal S2 is low level to this first output signal S1, and therefore, this
One latch-up signal SLH1 is output as high level, and this second latch-up signal SLH2 is then output as low level.When this first drive signal
SGD1 is non-when triggering this first switch Q1 for positive edge, and for low level, this second output signal S2 is still this first output signal S1
During low level, now, the output level of state before this first latch-up signal SLH1 and this second latch-up signal SLH2 maintains.Until working as
When this second drive signal SGD2 triggers this second switch Q2 for positive edge, this is first defeated for high level for this second output signal S2
Going out signal S1 is low level, and therefore, this second latch-up signal SLH2 is output as high level, and this first latch-up signal SLH1 then exports
For low level.When this second drive signal SGD2 is non-trigger this second switch Q2 for positive edge when, this second output signal S2 be low
When level and this first output signal S1 are still low level, now, this second latch-up signal SLH2 and this first latch-up signal
The output level of state before SLH1 maintenance.So, touched by the positive edge of this first drive signal SGD1 and this second drive signal SGD2
Send out the setting that homophase and anti-phase latch-up signal are provided and releasing, to reach control (interacting interlaced with each other
Control operational approach) so that after the conducting of this first switch Q1, this second switch Q2 is then cut-off state, conversely,
After this second switch Q2 conducting, this first switch Q1 is then cut-off state, and therefore, this two switch will not occur because same
When conducting, and cause short circuit situation about puncturing.
In sum, the present invention has following feature and advantage：
1st, bridge switch control circuit and its operational approach of this Interleaved control function are passed through, can be by switch conduction in the cycle
Working time increases so that improving the efficiency of bridge switch control circuit；
2nd, by the operational approach of control interlaced with each other so that two power switch loops will not be made because of simultaneously turning on
Become short circuit to puncture (short through) situation to occur；
3rd, when a certain phase switching circuitry because the unreasonably characteristic of noise jamming or switch element itself occurs extremely, this is abnormal
Switching circuitry can be latched, after unusual condition exclusion, just by unusual switch loop clear-latch, and can enter next cycle
Switching control so that improving circuit reliability and noise immunity ability；
4th, this has staggered handoff functionality bridge switch control circuit and its operational approach, are applicable to bridge-type such as
The circuit application of (comprising semibridge system and full-bridge type framework) topology framework, such as bridge rectifier (bridge
Rectifyingcircuit) it is described class；
5th, pass through bridge switch control circuit and its operational approach of this Interleaved control function, the anti-of additional can be saved
Only short-circuit perimeter circuit, and can reduces cost；And
6th, deisgn product person, under applying this circuit framework, can significantly shorten generation design time-histories, improve exploitation program
The efficiency of planning.
Only, the above, the detailed description of preferred embodiment only of the present invention and schema, only the feature of the present invention is simultaneously
It is not limited to this, and is not used to limit the present invention, all scopes of the present invention should be defined by following right, all conjunctions
In the embodiment of the spirit change similar with it of scope of the invention as claimed, all should be contained in the farmland of the present invention, Ren Heben
Skilled person in the field of the invention, can think easily and change or modify all can cover following this case right will
Seek scope.
Claims (16)
1. a kind of operational approach of bridge switch control circuit, comprises the steps of：
A () provides one first drive signal, one second drive signal, one first latch-up signal and one second latch-up signal, its
In this first drive signal and this second drive signal drive respectively at least one complementary switch to multiple switch；
(b) judge this first drive signal be whether rising edge trigger this at least one complementary switch to a switch；
If (c) this first drive signal for rising edge trigger this at least one complementary switch to this switch, control this first
Latch-up signal is high level, controls this second latch-up signal to be low level simultaneously, if this first drive signal is non-touching for rising edge
Send out this at least one complementary switch to this switch, then maintain this first latch-up signal and this second latch-up signal to be respectively low electricity
Put down and high level；
(d) judge this second drive signal be whether rising edge trigger this at least one complementary switch to another switch；And
If (e) this second drive signal for rising edge trigger this at least one complementary switch to this another switch, control should
Second latch-up signal be high level, control simultaneously this first latch-up signal be low level, if this second drive signal non-for rise
Edge trigger this at least one complementary switch to this another switch, then maintain this first latch-up signal to divide with this second latch-up signal
Wei not high level and low level.
2. bridge switch control circuit operational approach as claimed in claim 1, wherein when this at least one complementary switch to for
Two switch half-bridge formula frameworks, when this two switch is respectively a first switch and a second switch, this first drive signal with this
Two driving signal drives this first switch and this second switch respectively；If wherein this first drive signal be high level and this
When two driving signal is low level, then control this first latch-up signal to be high level, control this second latch-up signal to be low simultaneously
Level is so that this first switch turns on and the cut-off of this second switch, to prevent this first switch from leading with this second switch simultaneously
Lead to and cause short-circuit condition.
3. bridge switch control circuit operational approach as claimed in claim 1, wherein when this at least one complementary switch to for
Two switch half-bridge formula frameworks, when this two switch is respectively a first switch and a second switch, this first drive signal with this
Two driving signal drives this first switch and this second switch respectively；If wherein this second drive signal be high level and this
When one drive signal is low level, then control this second latch-up signal to be high level, control this first latch-up signal to be low simultaneously
Level is so that this second switch turns on and the cut-off of this first switch, to prevent this second switch from leading with this first switch simultaneously
Lead to and cause short-circuit condition.
4. bridge switch control circuit operational approach as claimed in claim 1, wherein when this at least one complementary switch to for
Four switch full formula frameworks, this four switch is respectively a first switch, a second switch, one the 3rd switch and one the 4th switch
When, and this first switch and the 4th switch form the first switch group that simultaneously turns on or end, this second switch with should
3rd switch forms the second switch group simultaneously turning on or ending, and this first drive signal is driven respectively with this second drive signal
Move this first switch group and this second switch group；If wherein this first drive signal is high level and this second drive signal is
During low level, then control this first latch-up signal to be high level, control this second latch-up signal to be low level simultaneously so that this
One switches set conducting and the cut-off of this second switch group, are caused with preventing this first switch group from being simultaneously turned on this second switch group
Short-circuit condition.
5. bridge switch control circuit operational approach as claimed in claim 1, wherein when this at least one complementary switch to for
Four switch full formula frameworks, this four switch is respectively a first switch, a second switch, one the 3rd switch and one the 4th switch
When, and this first switch and the 4th switch form the first switch group that simultaneously turns on or end, this second switch with should
3rd switch forms the second switch group simultaneously turning on or ending, and this first drive signal is driven respectively with this second drive signal
Move this first switch group and this second switch group；If wherein this second drive signal is high level and this first drive signal is
During low level, then control this second latch-up signal to be high level, control this first latch-up signal to be low level simultaneously so that this
Two switches set conductings and the cut-off of this first switch group, are caused with preventing this second switch group from being simultaneously turned on this first switch group
Short-circuit condition.
6. bridge switch control circuit operational approach as claimed in claim 1, wherein this at least one complementary switch is to conducting
Hand over cut-off to get over and locate all to provide a short circuit to prevent the time.
7. bridge switch control circuit operational approach as claimed in claim 1, wherein this at least one complementary switch is to for gold
Belong to MOSFET or igbt.
8. a kind of bridge switch control circuit comprises：
One bridge circuit, comprise at least one complementary switch right, this at least one complementary switch to respectively by two drive signal institutes
Control；And
One control module, comprises：
One judging unit, according to this at least one complementary switch to voltage across poles size, judge this at least one complementary switch
To conducting and cut-off state, and corresponding produce two output signals；And
One latch lock unit, receives this two output signal, and provides latch operations according to the level of this two output signal, with correspondence
Export two latch-up signals；
If wherein this drive signal for rising edge trigger this at least one complementary switch to a switch, control corresponding should
Latch-up signal be high level, control simultaneously another latch-up signal be low level so that this at least one complementary switch to this open
Close as conducting state, and another switch as cut-off state, to prevent this at least one complementary switch from causing short circuit to simultaneously turning on
State；
Two amplification voltage cell, each this amplification voltage cell is corresponding receive this at least one complementary switch to voltage across poles,
And amplify this voltage across poles, to produce an amplification voltage across poles；And
Two comparing units, each this comparing unit is corresponding to receive this amplification voltage across poles and a reference voltage, and compares this and put
Big voltage across poles and the size of this reference voltage, to produce a level signal；If wherein this amplification voltage across poles is more than this reference
Voltage, this level signal is then high level, if this amplification voltage across poles is less than this reference voltage, this level signal is then low electricity
Flat.
9. bridge switch control circuit as claimed in claim 8, wherein this two drive signal are one first drive signal and
Second drive signal, this two latch-up signal is one first latch-up signal and one second latch-up signal；If this first drive signal is
Rising edge trigger this at least one complementary switch to this switch, then control this first latch-up signal be high level, control simultaneously
This second latch-up signal be low level, if this first drive signal non-for rising edge trigger this at least one complementary switch to should
Switch, then maintain this first latch-up signal to be respectively low level and high level with this second latch-up signal；If this second driving letter
Number for rising edge trigger this at least one complementary switch to this another switch, then control this second latch-up signal be high level,
Control this first latch-up signal to be low level, if this second drive signal is non-and triggering this for rising edge and at least one complementary open simultaneously
Close to this another switch, then maintain this first latch-up signal and this second latch-up signal to be respectively high level and low level.
10. bridge switch control circuit as claimed in claim 9, wherein when this at least one complementary switch is to for two switches partly
Bridge-type framework, when this two switch is respectively a first switch and a second switch, this first drive signal second drives letter with this
Number drive this first switch and this second switch respectively；If wherein this first drive signal is high level and this second driving letter
Number for low level when, then control this first latch-up signal be high level, control simultaneously this second latch-up signal be low level so that
The conducting of this first switch and the cut-off of this second switch, cause short circuit to prevent this first switch and this second switch from simultaneously turning on
State.
11. bridge switch control circuits as claimed in claim 9, wherein when this at least one complementary switch is to for two switches partly
Bridge-type framework, when this two switch is respectively a first switch and a second switch, this first drive signal second drives letter with this
Number drive this first switch and this second switch respectively；If wherein this second drive signal is high level and this first driving letter
Number for low level when, then control this second latch-up signal be high level, control simultaneously this first latch-up signal be low level so that
The conducting of this second switch and the cut-off of this first switch, cause short circuit to prevent this second switch and this first switch from simultaneously turning on
State.
12. bridge switch control circuits as claimed in claim 9, wherein when this at least one complementary switch is to complete for four switches
Bridge-type framework, when this four switch is respectively a first switch, a second switch, one the 3rd switch and one the 4th switch, and
This first switch and the 4th switch form the first switch group simultaneously turning on or ending, this second switch and the 3rd switch
Form the second switch group that simultaneously turns on or end, this first drive signal and this second drive signal drive respectively this first
Switches set and this second switch group；If wherein for high level and this second drive signal is low level to this first drive signal
When, then control this first latch-up signal to be high level, control this second latch-up signal to be low level so that this first switch simultaneously
Group conducting and the cut-off of this second switch group, cause short-circuit shape to prevent this first switch group and this second switch group from simultaneously turning on
State.
13. bridge switch control circuits as claimed in claim 9, wherein when this at least one complementary switch is to complete for four switches
Bridge-type framework, when this four switch is respectively a first switch, a second switch, one the 3rd switch and one the 4th switch, and
This first switch and the 4th switch form the first switch group simultaneously turning on or ending, this second switch and the 3rd switch
Form the second switch group that simultaneously turns on or end, this first drive signal and this second drive signal drive respectively this first
Switches set and this second switch group；If wherein for high level and this first drive signal is low level to this second drive signal
When, then control this second latch-up signal to be high level, control this first latch-up signal to be low level so that this second switch simultaneously
Group conducting and the cut-off of this first switch group, cause short-circuit shape to prevent this second switch group and this first switch group from simultaneously turning on
State.
14. bridge switch control circuits as claimed in claim 8, wherein this at least one complementary switch are handed over cut-off to conducting
More place all provides a short circuit to prevent the time.
15. bridge switch control circuits as claimed in claim 8, wherein this at least one complementary switch is to for metal-oxide
Semiconductcor field effect transistor or igbt.
16. bridge switch control circuits as claimed in claim 8, wherein this latch lock unit be nor gate R-S latch unit with non-
Door R-S latch unit or D type latch unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310057049.6A CN104009615B (en) | 2013-02-22 | 2013-02-22 | Bridge switch control circuit and its operational approach |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310057049.6A CN104009615B (en) | 2013-02-22 | 2013-02-22 | Bridge switch control circuit and its operational approach |
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| CN104009615A CN104009615A (en) | 2014-08-27 |
| CN104009615B true CN104009615B (en) | 2017-03-01 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1470968A (en) * | 2002-06-13 | 2004-01-28 | ��ķ�ɷ�����˾ | Switch device driving device and DC/DC current transformer |
| CN202663288U (en) * | 2012-05-22 | 2013-01-09 | 苏州工业园区博百电气电子有限公司 | Single bridge arm drive circuit of inverter and application circuit thereof |
-
2013
- 2013-02-22 CN CN201310057049.6A patent/CN104009615B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1470968A (en) * | 2002-06-13 | 2004-01-28 | ��ķ�ɷ�����˾ | Switch device driving device and DC/DC current transformer |
| CN202663288U (en) * | 2012-05-22 | 2013-01-09 | 苏州工业园区博百电气电子有限公司 | Single bridge arm drive circuit of inverter and application circuit thereof |
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| CN104009615A (en) | 2014-08-27 |
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