CN205610492U - Source transformation circuit and drive and control circuit thereof - Google Patents
Source transformation circuit and drive and control circuit thereof Download PDFInfo
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- CN205610492U CN205610492U CN201620468255.5U CN201620468255U CN205610492U CN 205610492 U CN205610492 U CN 205610492U CN 201620468255 U CN201620468255 U CN 201620468255U CN 205610492 U CN205610492 U CN 205610492U
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Abstract
The utility model discloses a source transformation circuit and drive and control circuit thereof, including power stage circuit and drive and control circuit, the power stage circuit for turn over swashing formula circuit or voltage step -up and step -down typed circuit, contain the master power switch pipe in the circuit, drive and control circuit is used for controlling the on off state of master power switch pipe, drive and control circuit carry out the comparison through ramp signal and reference signal for produce the shut -off signal who turn -offs the master power switch pipe, ramp signal lead to constantly at the master power switch piping and rise from zero line nature, reach during reference signal, the master power switch pipe turn -offs, reference signal with the compensation signal of source transformation ware and the ratio of master power switch pipe duty cycle, becomes proportional relationship. The utility model provides a reference signal has considered the change of duty cycle, and in arrival current's calculation, this duty cycle parameter can be offset for input voltage and arrival current are directly proportional, have reached the technological effect of eliminating the total harmonic distortion phenomenon that the duty cycle aroused.
Description
Technical field
This utility model relates to electric and electronic technical field, is specifically related to a kind of power converting circuit and drives
Dynamic control circuit.
Background technology
In ac-dc conversion (AC/DC) circuit, in order to reduce the circuit pollution to electrical network, need it
Input current waveform is sinusoidal, and and accesses line voltage same phase, to reach low total harmonic distortion
(Total Harmonic Distortion) THD and the requirement of High Power Factor (PF).The electricity of this high PF
Road can be described as the circuit of band PFC (PFC).
As a example by inverse-excitation type translation circuit, the inverse-excitation type translation circuit one of High Power Factor critical conduction mode
As use peak value comparison method, or constant on-time (COT) control.Peak current control method
Essence falls within constant on-time control model, illustrates with peak value comparison method below.
Inverse-excitation type translation circuit as shown in Figure 1 includes flyback power level circuit and drives control circuit,
Described driving control circuit, in order to control the conducting state of the MOS of flyback power level circuit, drives
Control circuit is a kind of conventional peak current control circuitry so that inverse-excitation type translation circuit circuit works in and faces
Boundary's conduction mode.After critical conduction mode i.e. transformator or inductive current drop to 0, then control MOS
Conducting.Critical conduction mode can reduce the turn-on consumption of MOS, thus is effectively improved system effectiveness.
Driving control circuit in Fig. 1 uses multiplier to be PFC's method particularly includes: drives and controls electricity
The input sampling circuit sampled input voltage signal on road, simultaneously by input voltage sampled signal and compensation signal
COMP is multiplied, and obtains command signal.Owing to the bandwidth of control system is far below mains frequency, so
The change frequency of COMP is far below input voltage frequency (mains frequency), at a grid cycle (also
It is referred to as power frequency period) in, it is believed that COMP voltage is basically unchanged, and therefore this command signal is sinusoidal,
And and line voltage homophase.Owing to circuit is operated in critical conduction mode, during metal-oxide-semiconductor conducting, its electric current
Rising from 0, metal-oxide-semiconductor electric current is flow through in sampling resistor sampling, when sampled current signals SNP is equal to instruction
During signal, control metal-oxide-semiconductor and turn off.Therefore, the peak I of metal-oxide-semiconductor electric currentPEAKEnvelope be just
String, and and input voltage same phase.
As in figure 2 it is shown, illustrate input voltage vin waveform, fly-wheel diode electric current iDWaveform, MOS
The electric current i of pipe M2MOSWaveform and the waveform of gate pole GATE thereof.The meansigma methods of the electric current of metal-oxide-semiconductor M2
It is input current.The peak point current I of metal-oxide-semiconductor M2PEAKAnd input voltage vin, magnetizing inductance LM
And ON time TONRelation be: Vin=LM*IPEAK/TON.Input average current iinAnd metal-oxide-semiconductor
The peak point current I of M2PEAKWith the relation between dutycycle D is: iin=IPEAK*D/2.Wherein, duty
Compare D=TON/ T, T are switch periods.Therefore, it can obtain input current iinAnd input voltage vin,
Magnetizing inductance LM, ON time TON, the relation between switch periods T is iin=Vin*D*TON/(2*
LM)。TONAccording to sinusoidal wave peak value, T can be derivedON=LM*IPEAK/VPEAK, wherein, VPEAKFor
The peak value of input voltage vin；D=n*Vo/ (Vin+n*Vo), wherein n is the former secondary of transformator TR1
The turn ratio, Vo is output voltage.
In the middle of above prior art, owing to dutycycle is the amount with grid voltage change.Work as input voltage
The when of high, dutycycle D is little, and the when that input voltage being low, dutycycle D is big, so input current
Be not standard sine, therefore input current still suffer from total harmonic distortion (THD), input current
Waveform there is also the space of further optimization.
Utility model content
In view of this, the purpose of this utility model is provide a kind of power converting circuit and drive control
Circuit, in order to solve the technical problem of the harmonic distortion that prior art exists.
Technical solution of the present utility model is to provide the power converting circuit of a kind of following structure, bag
Including power stage circuit and drive control circuit, described power stage circuit is reverse excitation circuit or buck-boost type
Circuit, described reverse excitation circuit or buck-boost type circuit include master power switch pipe, described driving
Control circuit is for controlling the on off state of master power switch pipe；It is characterized in that:
Described driving control circuit is compared with reference signal by ramp signal, in order to produce shutoff
The cut-off signals of master power switch pipe, described ramp signal at master power switch pipe turn-on instant from zero line
Property rise, when reaching described reference signal, master power switch pipe turn off；Described reference signal, with power supply
The ratio compensating signal and master power switch pipe dutycycle of changer, direct proportionality.
Preferably, the described signal that compensates by the output voltage of supply convertor or exports electric current and corresponding base
Calibration signal obtains after amplifier, in order to characterize the error of the two.
Preferably, described driving control circuit includes ramp signal generating circuit, described ramp signal
Producing circuit and include current source, electric capacity and switch, described electric capacity is charged by described current source, described
One of them common end grounding of electric capacity and switch in parallel, described electric capacity and switch, another common port is made
Ramp signal is exported for outfan.
Preferably, described current source is produced by current source change-over circuit, described current source change-over circuit
Receiving a voltage, described voltage, through current source change-over circuit, is translated into described current source；Described
Current source change-over circuit be trsanscondutance amplifier.
Preferably, described driving control circuit also includes reference signal generation circuit, described reference signal
Generation circuit is division circuit, and described reference signal generation circuit receives the letter characterizing described compensation signal
Number and characterize the signal of described dutycycle, through computing, obtain characterizing described compensation signal and described duty
The reference signal of the ratio of ratio.
Preferably, described reference signal generation circuit receive described in compensation signal and in order to control main merit
The pwm signal of rate switching tube on off state, the reference signal described in output.
Preferably, described reference signal generation circuit includes operational amplifier and on-off circuit, described
The compensation signal described in first input end reception of operational amplifier, the second of described operational amplifier is defeated
Enter end and an electric capacity of connecting between its outfan, described on-off circuit include being serially connected the first switch and
Second switch, the other end of described first switch is connected with the outfan of operational amplifier, and described second opens
The other end ground connection closed, the common port of described first switch and second switch is defeated with the second of operational amplifier
Enter the first resistance of connecting between end.
Preferably, the control of the first described switch terminates into described pwm signal, by described PWM
Signal negate after as the control signal of described second switch.
Preferably, described reference signal generation circuit includes that the first current converter circuit, the second electric current turn
Changing circuit and operational amplifier, the first described current converter circuit is defeated with the first of described operational amplifier
Entering end to connect, the second described current converter circuit is connected with the second input of described operational amplifier,
The outfan of operational amplifier is connected with the control end of electric current regulation pipe, and described electric current regulation pipe accesses institute
The first current converter circuit stated, regulates the electricity of the first current converter circuit by controlling electric current regulation pipe
Stream, so that the voltage of the two of described operational amplifier inputs is equal.
Preferably, the first described current converter circuit receives the first current source, the first described current source
With described dutycycle direct proportionality；The second described current converter circuit receives the second current source and
Three current sources, one of them of the second described current source and the 3rd current source just becomes with described compensation signal
Proportionate relationship, then another one is constant-current source.
Preferably, the first described current converter circuit and the second current converter circuit are respectively by two three poles
Pipe is formed by connecting, and the colelctor electrode of said two audion is connected with each other, the base stage of one of them audion with
The emitter stage of another audion connects, and the base stage of this another audion is corresponding to another current converter circuit
The base stage of audion connects；Sending out of first current converter circuit and second two audions of current converter circuit
The common port of emitter-base bandgap grading is respectively connected to two inputs of operational amplifier, the outfan of described operational amplifier
And regulate Guan Lian through electric current between the emitter stage of this another audion described in one of them current converter circuit
Connect.
Another technical solution of the present utility model is to provide the driving of a kind of circuits below structure and controls
Circuit, including ramp signal generating circuit and reference signal generation circuit, described ramp signal produces electricity
Road produces ramp signal, and described reference signal generation circuit produces reference signal, by ramp signal with
Reference signal compares, in order to produce the cut-off signals turning off master power switch pipe, and described slope letter
Number at master power switch pipe turn-on instant from zero linear rising, when reaching described reference signal, main power is opened
Pass pipe turns off；Described reference signal, with compensation signal and the master power switch pipe dutycycle of supply convertor
Ratio, direct proportionality.
Use circuit structure of the present utility model, compared with prior art, have the advantage that due to existing
Have existing for technology because of input voltage change cause change in duty cycle so that input current and input voltage
Phase place inconsistent, cause the phenomenon that there is harmonic distortion；This utility model, in view of above-mentioned condition, is driving
In dynamic control circuit, introducing this parameter of dutycycle in reference signal, i.e. described reference signal is examined
Having considered the change of dutycycle, in the calculating of input current, this duty cycle parameters can be cancelled, and therefore accounts for
The change of empty ratio no longer affects input current so that input voltage is directly proportional to input current, has reached to disappear
Technique effect except the total harmonic distortion phenomenon caused by dutycycle.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the inverse excitation type converter using prior art driving control circuit；
Fig. 2 is the working waveform figure of Fig. 1 prior art；
Fig. 3 is this utility model circuit structure diagram for the driving control circuit of power converting circuit；
Fig. 4 is the structural representation of feedback compensation circuit；
Fig. 5 is the working waveform figure of Fig. 3；
Fig. 6 is the another kind of embodiment of reference signal generation circuit of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, but this utility model
It is not restricted to these embodiments.This utility model is contained any in spirit and scope of the present utility model
On replacement, amendment, equivalent method and the scheme made.
Understand thoroughly to make the public that this utility model to be had, at following this utility model preferred embodiment
In concrete details is described in detail, and there is no the description of these details for a person skilled in the art yet
This utility model can be understood completely.
Referring to the drawings this utility model the most more particularly described below in the following passage.It should be noted that
It is that accompanying drawing all uses the form more simplified and all uses non-ratio accurately, only in order to convenient, distinct
Ground aids in illustrating the purpose of this utility model embodiment.
With reference to shown in Fig. 3, illustrating to drive the physical circuit figure of an embodiment of control circuit, this drives
Dynamic control circuit can be used for inverse-excitation type translation circuit (Flyback), buck-boost type translation circuit
(Buck-Boost) Switching Power Supply of topological structure such as.Although, background technology is with inverse-excitation type translation circuit
Existing technical problem has been made to illustrate, but the act being intended merely to illustrate the needs of technical problem and making
Example explanation, it is impossible to constitute the restriction to this utility model application.
Power converting circuit of the present utility model includes power stage circuit and drives control circuit, described merit
Rate level circuit refers to the Basic Topological of corresponding power conversion, such as, inverse-excitation type, buck-boost type etc..
Described power stage circuit includes master power switch pipe, uses drive control circuit master power switch pipe
Break-make, to realize Power convert.
Of the present utility model it is critical that to drive control circuit improvement.Described driving control circuit
Compared with reference signal Vref by ramp signal Vrp, turn off master power switch pipe in order to produce
Cut-off signals, described ramp signal Vrp, reaches from zero linear rising at master power switch pipe turn-on instant
During to described reference signal, master power switch pipe turns off, and ramp signal instantaneous be down to zero (upper once
It is down to zero before conducting, at this, simply proposes a kind of mode according to figure)；Described reference signal Vref,
With compensation signal COMP and the ratio of master power switch pipe dutycycle D of supply convertor, it is directly proportional
Example relation.
Described compensation signal COMP (is typically passed through by output voltage or the output electric current of supply convertor
Corresponding sampled signal characterizes) obtain after amplifier with corresponding reference signal, in order to characterize the mistake of the two
Difference, the most as shown in Figure 4.
Described driving control circuit includes ramp signal generating circuit and reference signal generation circuit, described
Ramp signal generating circuit include current source, electric capacity Crp and switch SW3, described current source is to institute
Stating electric capacity Crp charging, described electric capacity Crp is in parallel with switch SW3, described electric capacity Crp and switch
One of them common end grounding of SW3, another common port exports ramp signal Vrp as outfan.
Described current source is produced by current source change-over circuit, in the present embodiment, uses trsanscondutance amplifier
U3 is as current source change-over circuit, and the gain of trsanscondutance amplifier U3 is Gm, described trsanscondutance amplifier
U3 receives constant voltage Vst, and described constant voltage Vst, through trsanscondutance amplifier U3, is translated into institute
Stating current source, the electric current of this current source is I=Vst*Gm, Vrp=Vst*Gm*t/Crp.Implementation above
In, the voltage that U3 is received is the situation of non-constant voltage, i.e. this voltage can also be for the voltage of change, equally
Can implement, and reach corresponding technique effect.Reason is, but the speed of this change in voltage is much slower than
Switching speed, for switch, is a fixing voltage.
When Vrp reaches reference signal Vref, the ON time of master power switch pipe terminates and turns off, because of
Vref=k (COMP/D), then have Vst*Gm*Ton/Crp=k (COMP/D), Ton*D=k
Crp*COMP/(Vst*Gm).Driving control circuit of the present utility model to be applied to inverse-excitation type conversion
As a example by device, i.e. the topological structure of power stage circuit is inverse-excitation type, then, iin=Vin*D*Ton/ (2*
LM), Ton*D=Crp*COMP/ (Vst*Gm) is substituted into above-mentioned formula, obtains iin=k Vin*Crp
*COMP/(2*LM*Vst*Gm)。LMMagnetizing inductance for former limit inductance.In above-mentioned expression formula, Vst
Being a fixed voltage, Gm is the mutual conductance that voltage turns current module, is all constant.So, input electricity
Stream iinIt is directly proportional with input voltage vin, when input voltage vin is sine, input current iinAlso just it is
String, is effectively reduced THD, improves PF.
Described reference signal generation circuit from calculate or functionally for, it is believed that be division circuit, i.e.
Achieve the ratio compensating signal COMP with master power switch pipe dutycycle D, the reference signal obtained
Vref introduces parameter dutycycle D.Certainly, it is achieved that this calculating, multiple embodiment can be used,
In Fig. 3, applicant proposed an embodiment,
Described reference signal generation circuit includes operational amplifier U1 and on-off circuit, described computing
The compensation signal COMP described in first input end reception of amplifier U1 (includes characterizing compensation letter
The signal of number COMP), the second input (its voltage Va table of described operational amplifier U1
Show) with the electric capacity C1 that connects between its outfan, described on-off circuit includes being serially connected the first switch
SW1 and second switch SW2, the other end of described first switch SW1 is defeated with operational amplifier U1's
Going out end to connect, the other end ground connection of described second switch SW2, described first switch SW1 and second opens
Close the first resistance R1 that connects between common port and second input of operational amplifier U1 of SW2.Institute
The control of the first switch SW1 stated terminates into described pwm signal, by inverted for described pwm signal
Device U2 negate after as the control signal of described second switch SW2.
Master power switch pipe typically uses metal-oxide-semiconductor, when MOS turns on, i.e. when PWM is high, the
One switch SW1 conducting, second switch SW2 turns off, the first switch and the common port Vb of second switch
Voltage is the output voltage Vref of amplifier U1；When MOS turns off, i.e. when PWM is low, switch
SW2 turns on, and switch SW1 turns off, and Vb voltage is 0.The voltage of amplifier U1 the second input Va is
The meansigma methods of Vb voltage, i.e. Vref*D, wherein D is dutycycle, i.e. Ton/T.Due to Va=COMP,
Then COMP=Vref*D, i.e. Vref=COMP/D.
Use the reference signal generation circuit in above-described embodiment can by reference signal Vref effectively and
Dutycycle associates, in order in the relation of input voltage and input current, eliminates change in duty cycle pair
The impact of the two phase place so that the two is directly proportional.
With reference to shown in Fig. 4, illustrate feedback compensation circuit is embodied as circuit.Described feedback compensation
It is defeated that circuit includes that two inputs of operational amplifier U7, described operational amplifier U7 receive sign respectively
Go out voltage or sampled signal FB of output electric current and reference signal REF, thus be compensated signal
COMP, it is generally the case that also compensation electric capacity can be set at the outfan of operational amplifier U7, in order to
Keep the stability compensating signal COMP.Additionally, for the circuit of feedback compensation circuit, be not limited to
Embodiment in Fig. 4, it is also possible to use the modes such as trsanscondutance amplifier to realize.
With reference to shown in Fig. 5, illustrate ramp signal Vrp and the waveform of master power switch pipe gate pole Gate
Figure, Gate substantially characterizes pwm signal, represents ON time and the information of dutycycle simultaneously.
Understanding in figure, ramp signal Vrp, at master power switch pipe turn-on instant, starts linear rise, when it reaches
During to reference signal Vref, master power switch pipe turns off, and ramp signal voltage is reduced to 0.Such as Fig. 3
Shown in, ramp signal Vrp and reference signal Vref input comparator U4 respectively, comparator export phase
The cut-off signals answered, and input the replacement end of rest-set flip-flop U5, form the trailing edge of pwm signal.
And open-minded for master power switch pipe, essential features the most of the present utility model, can be by master
The drain signal of power tube compares with corresponding signal, thus triggers the conducting of master power switch pipe, but not
It is limited to this kind of form.Rest-set flip-flop U5 output pwm signal, and inputted by drive circuit U6
Control end to master power switch pipe.
Show with reference to Fig. 6, for the another kind of embodiment of this utility model reference signal generation circuit, described
Reference signal generation circuit includes the first current converter circuit, the second current converter circuit and operation amplifier
Device, the first described current converter circuit is connected with the first input end of described operational amplifier, described
Second current converter circuit is connected with the second input of described operational amplifier, the output of operational amplifier
The control end with electric current regulation pipe is held to be connected, described the first electric current conversion described in electric current regulation pipe access
Circuit, regulates the electric current of the first current converter circuit by controlling electric current regulation pipe, so that described computing
The voltage of two inputs of amplifier is equal.
The first described current converter circuit receives the first current source, and the first described current source accounts for described
Sky compares direct proportionality；The second described current converter circuit receives the second current source and the 3rd electric current
Source, one of them of the second described current source and the 3rd current source and described compensation signal pass in direct ratio
System, then another one is constant-current source.
The first described current converter circuit and the second current converter circuit are respectively by two audions connections
Becoming, the colelctor electrode of said two audion is connected with each other, the base stage of one of them audion and another three pole
The emitter stage of pipe connects, the corresponding audion of the base stage of this another audion and another current converter circuit
Base stage connects；The public affairs of the emitter stage of the first current converter circuit and second two audions of current converter circuit
End is respectively connected to two inputs of operational amplifier, the outfan of described operational amplifier and wherein altogether
Connect through electric current regulation pipe between the emitter stage of this another audion described of individual current converter circuit.
As a example by the audion used by side circuit and annexation, the first current converter circuit includes three
Pole pipe Q10 and audion Q11, the electric current flowing through two pipes is respectively i10 and i11, audion Q10
Audion Q11 colelctor electrode interconnects, and receives supply voltage VD, and current source I10 puts at audion Q10
Emitter stage.In like manner, the second current converter circuit includes audion Q12 and audion Q13, flows through two
The electric current of individual pipe is respectively i12 and i13, the colelctor electrode interconnection of audion Q12 and audion Q13,
And receive voltage VD, current source I12 and current source I13 and be arranged on audion Q12 and audion Q13
Emitter stage, be connected to the equal ground connection of described emitter stage of respective current sources.The emitter stage of audion Q10 with
The first input end of operational amplifier U8 connects, the emitter stage of audion Q13 and operational amplifier U8
Second input connect.Electric current regulation pipe M10 is connected on the emitter stage of Q11, and described computing is put
The outfan of big device U8 connects the control end of electric current regulation pipe M10.
Principle in above circuit is as follows, I10*iout=I12*I13.If arranging the size of current source I12
Being proportional to COMP voltage, be COMP/R11, wherein, R11 is to fix equiva lent impedance.I13
Being a fixed current source, the size of current source I10 is proportional to dutycycle D, i.e. D/R12, wherein, and R12
It is to fix equiva lent impedance.Iout=COMP/D* (I13*R12/R11), wherein, I13*R12/R11 is one
Constant, iout is i.e. proportional to COMP/D.Electric current iout flows through resistance R10, obtains voltage Vout, then
Output voltage Vout is proportional to COMP/D.
The size that can also arrange current source I13 is proportional to COMP voltage, and I12 is a fixed current source.
In audion, owing to base current is much smaller than the electric current of collector and emitter, therefore colelctor electrode
Electric current is approximately equal to emitter current.I.e. i10=I10；I11=iout；I12=I12；I13=I13.At audion
In, there is formulaWherein ic is collector current, and VBE is between base stage and emitter stage
Voltage.Therefore,Therefore, as
Really vx=vy, then i10*i11=i12*i13, i.e. I10*iout=I12*I13.Amplifier U10 is managed by adjustment
M10, regulates electric current iout so that vx=vy, and therefore I10*iout=I12*I13 sets up.
Electric current adjusts pipe M10 and is not necessarily intended to be connected to the emitter stage of Q11, can be connected to Q10-Q13
Any one road emitter stage, the electric current arranging other several roads emitter stages is input current.
Embodiments described above, is not intended that the restriction to this technical scheme protection domain.Any
Amendment, equivalent and the improvement etc. made within the spirit of above-mentioned embodiment and principle, all should comprise
Within the protection domain of this technical scheme.
Claims (12)
1. a power converting circuit, including power stage circuit and driving control circuit, described power
Level circuit is in reverse excitation circuit or buck-boost type circuit, described reverse excitation circuit or buck-boost type circuit
Including master power switch pipe, described driving control circuit is for controlling the switch shape of master power switch pipe
State；It is characterized in that:
Described driving control circuit is compared with reference signal by ramp signal, in order to produce shutoff
The cut-off signals of master power switch pipe, described ramp signal at master power switch pipe turn-on instant from zero line
Property rise, when reaching described reference signal, master power switch pipe turn off；Described reference signal, with power supply
The ratio compensating signal and master power switch pipe dutycycle of changer, direct proportionality.
Power converting circuit the most according to claim 1, it is characterised in that: described compensation letter
Number by supply convertor output voltage or output electric current obtain after amplifier with corresponding reference signal, in order to
Characterize the error of the two.
Power converting circuit the most according to claim 2, it is characterised in that: described driving control
Circuit processed includes that ramp signal generating circuit, described ramp signal generating circuit include current source, electric capacity
And switch, described electric capacity is charged by described current source, described electric capacity and switch in parallel, described electric capacity
With one of them common end grounding of switch, another common port exports ramp signal as outfan.
Power converting circuit the most according to claim 3, it is characterised in that: described current source
Being produced by current source change-over circuit, described current source change-over circuit receives a voltage, described voltage warp
Current source change-over circuit, is translated into described current source；Described current source change-over circuit is that mutual conductance is put
Big device.
5. according to the power converting circuit described in Claims 2 or 3, it is characterised in that: described driving
Control circuit also includes that reference signal generation circuit, described reference signal generation circuit are division circuit, institute
The reference signal generation circuit stated receives the signal characterizing described compensation signal and the letter characterizing described dutycycle
Number, through computing, obtain the reference signal characterizing described compensation signal with the ratio of described dutycycle.
Power converting circuit the most according to claim 5, it is characterised in that: described reference letter
Number produce circuit receive described in compensate signal and in order to control the PWM of master power switch pipe on off state
Signal, the reference signal described in output.
Power converting circuit the most according to claim 6, it is characterised in that: described reference letter
Number produce circuit include that operational amplifier and on-off circuit, the first input end of described operational amplifier connect
Compensation signal described in receipts, connects one between the second input of described operational amplifier and its outfan
Electric capacity, described on-off circuit includes being serially connected the first switch and second switch, described first switch
The other end is connected with the outfan of operational amplifier, the other end ground connection of described second switch, and described first
Switch the first resistance of connecting between the common port of second switch and the second input of operational amplifier.
Power converting circuit the most according to claim 7, it is characterised in that: described first opens
The control closed terminates into described pwm signal, opens as described second after being negated by described pwm signal
The control signal closed.
Power converting circuit the most according to claim 5, it is characterised in that: described reference letter
Number produce circuit include the first current converter circuit, the second current converter circuit and operational amplifier, described
The first current converter circuit be connected with the first input end of described operational amplifier, the second described electric current
Change-over circuit is connected with the second input of described operational amplifier, the outfan of operational amplifier and electric current
The control end of regulation pipe connects, described the first current converter circuit described in electric current regulation pipe access, logical
Cross control electric current regulation pipe and regulate the electric current of the first current converter circuit, so that described operational amplifier
The voltage of two inputs is equal.
Power converting circuit the most according to claim 9, it is characterised in that: the first described electricity
Stream change-over circuit receives the first current source, the first described current source and described dutycycle pass in direct ratio
System；The second described current converter circuit receives the second current source and the 3rd current source, the second described electricity
One of them of stream source and the 3rd current source and described compensation signal direct proportionality, then another one is
Constant-current source.
11. power converting circuits according to claim 10, it is characterised in that: described first
Current converter circuit and the second current converter circuit are formed by connecting by two audions respectively, said two three
The colelctor electrode of pole pipe is connected with each other, and the base stage of one of them audion connects with the emitter stage of another audion
Connecing, the base stage of this another audion connects to the base stage of the corresponding audion of another current converter circuit；The
The common port of the emitter stage of one current converter circuit and second two audions of current converter circuit is respectively connected to
Two inputs of operational amplifier, the outfan of described operational amplifier and one of them electric current conversion electricity
Connect through electric current regulation pipe between the emitter stage of this another audion described on road.
12. 1 kinds drive control circuit, it is characterised in that: include ramp signal generating circuit and with reference to letter
Number producing circuit, described ramp signal generating circuit produces ramp signal, and described reference signal produces
Circuit produces reference signal, is compared with reference signal by ramp signal, in order to produce the main merit of shutoff
The cut-off signals of rate switching tube, described ramp signal at master power switch pipe turn-on instant on zero linear
Rising, when reaching described reference signal, master power switch pipe turns off；Described reference signal, with power conversion
The ratio compensating signal and master power switch pipe dutycycle of device, direct proportionality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620468255.5U CN205610492U (en) | 2016-05-20 | 2016-05-20 | Source transformation circuit and drive and control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620468255.5U CN205610492U (en) | 2016-05-20 | 2016-05-20 | Source transformation circuit and drive and control circuit thereof |
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| CN205610492U true CN205610492U (en) | 2016-09-28 |
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| CN201620468255.5U Expired - Fee Related CN205610492U (en) | 2016-05-20 | 2016-05-20 | Source transformation circuit and drive and control circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827123A (en) * | 2016-05-20 | 2016-08-03 | 杰华特微电子（杭州）有限公司 | Power conversion circuit and drive control circuit thereof |
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2016
- 2016-05-20 CN CN201620468255.5U patent/CN205610492U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827123A (en) * | 2016-05-20 | 2016-08-03 | 杰华特微电子（杭州）有限公司 | Power conversion circuit and drive control circuit thereof |
| CN105827123B (en) * | 2016-05-20 | 2018-08-21 | 杰华特微电子（杭州）有限公司 | Power converting circuit and its drive control circuit |
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