CN103066811A - Switch converter double-edge constant breakover time modulation voltage type control method and device thereof - Google Patents
Switch converter double-edge constant breakover time modulation voltage type control method and device thereof Download PDFInfo
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- CN103066811A CN103066811A CN2013100051297A CN201310005129A CN103066811A CN 103066811 A CN103066811 A CN 103066811A CN 2013100051297 A CN2013100051297 A CN 2013100051297A CN 201310005129 A CN201310005129 A CN 201310005129A CN 103066811 A CN103066811 A CN 103066811A
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Abstract
The invention discloses a switch converter double-edge constant breakover time modulation voltage type control method and a device thereof. According to relation between output voltages and voltage reference value, the switch converter double-edge constant breakover time modulation voltage type control method and the device thereof use a control time series formed by constant breakover, turn-off and constant breakover or a control time series formed by turn-off, constant breakover and turn-off for controlling breakover and turn-off of the switch converter switch tube. The switch converter double-edge constant breakover time modulation voltage type control method and the device thereof can be used for controlling a plurality of switch converters with a topological structure, such as a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single tube normal shock converter, a double-tube normal shock converter, a push-pull converter, a push-pull normal shock converter, a half-bridge converter and a full-bridge converter. The switch converter double-edge constant breakover time modulation voltage type control method and the device thereof has the advantages of being simple in control, fast in transient response speed, high in voltage stabilization accuracy, and capable of not compensating network.
Description
Technical field
The present invention relates to power electronic equipment, especially a kind of control method of switch converters and device thereof.
Background technology
In recent years, power electronic device technology and electric electronic current change technology development become the focus of application and research as the switch power technology of power electronics key areas.Switching Power Supply mainly is made of switch converters and controller two parts.Switch converters is called again the power main circuit, mainly contains step-down (Buck), the various topological structures such as boost (Boost), buck (Buck-Boost), normal shock, half-bridge, full-bridge.Controller is used for the operating state of monitoring switch converter, and produces control wave control switch pipe, regulates the energy of supply load with stable output.For same switch converters, different control methods is so that converter has different transient states and steady-state behaviour.
The control of traditional pulse width modulation (PWM) voltage-type is the most common switch converters control method, its control thought is: converter output voltage and reference voltage are compared the error signal that obtains and generate control voltage after through the error amplifier compensation, and will control voltage and the fixed frequency sawtooth waveforms compares, obtain pulse control signal, by the turn-on and turn-off of drive circuit control switch pipe, realize the adjusting of switch converters output voltage again.In recent years, increasing application scenario requires its power supply to have fast transient response speed, when switching between standby, dormancy, normal operation such as some microprocessors, transient current speed is up to 130A/us, and this just requires its power supply to have fast transient response speed to satisfy the demand of load.Traditional PWM voltage-type control method realizes simple, but because adopting error amplifier, has the shortcomings such as mapping is poor, COMPENSATION NETWORK DESIGN is complicated, has been difficult to satisfy this demand of load.Traditional constant on-time modulation electric die mould control is one of comparatively common switch converters pulse frequency modulated (PFM) voltage-type control method, and its basic thought is: when each switch periods begins, and the switching tube conducting, the converter output voltage rises; Through behind the constant on-time, switching tube turn-offs, and output voltage descends, and when it dropped to reference voltage, switching tube is conducting again, began a new switch periods.Compare with the control of PWM voltage-type, adopt the switch converters mapping of PFM voltage-type control method good, but bad steady state accuracy.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of switch converters makes it to have simultaneously good mapping and steady-state behaviour, is applicable to the switch converters of various topological structures.
The present invention realizes that the technical scheme that its goal of the invention adopts is: the two edge constant on-time modulation electric die mould control methods of a kind of switch converters, it is characterized in that: detect output voltage in the zero hour of any one sampling pulse signal, output voltage values and voltage reference value are subtracted each other, and multiply by COEFFICIENT K, obtain signal f; Default one or two constant on-time T
1, T
2, and with the ON time addition, multiply by again COEFFICIENT K ',
Obtain signal f '; After signal f and signal f ' addition, generate the variable turn-off time, adopt the control sequential of constant on-time and variable turn-off time composition, conducting and the shutoff of control switch converter switches pipe.
Its concrete technical scheme has two:
1. at the actuating switch pipe zero hour of any one sampling pulse signal, detect simultaneously output voltage, output voltage values and voltage reference value are subtracted each other, and multiply by COEFFICIENT K
1, obtain first signal f
1Default two constant on-times, and with both additions, multiply by again COEFFICIENT K
2, obtain secondary signal f
2With first signal f
1With secondary signal f
2After the addition, generate the variable turn-off time.According to two constant ON time and a variable turn-off time, the control sequential that each cycle adopts constant conducting, shutoff, constant conducting to form successively, conducting and the shutoff of control switch converter switches pipe.
2. at the on-off switching tube zero hour of any one sampling pulse signal, detect simultaneously output voltage, output voltage values and voltage reference value are subtracted each other, and multiply by COEFFICIENT K
3, obtain the 3rd signal f
3Default constant on-time, and multiply by COEFFICIENT K
4, obtain the 4th signal f
4With the 3rd signal f
3With the 4th signal f
4After the addition, generate the variable turn-off time, be broken down into again two turn-off times.According to a constant ON time and two turn-off times, each cycle adopts successively shutoff, constant conducting, turn-offs the control sequential that forms, shutoff and the conducting of control switch converter switches pipe.
Compared with prior art, the invention has the beneficial effects as follows:
One, compares with existing PWM voltage-type switch converters, switch converters of the present invention is when load changes, the variation of output voltage changes the size of turn-off time immediately, thereby the length of quick adjustment switch converters switching tube turn-off time has improved the mapping of converter.
Two, compare with existing PFM voltage-type switch converters, the switch converters precision of voltage regulation of the present invention is high, and steady-state behaviour is good; When the heavy load range, output voltage and inductive current transient state overshoot are little,
The adjusting time is short, and mapping is good.
Three, controller need not error amplifier, has simplified the design of control loop, and control is simple, has strengthened
The stability of a system and transient response ability.
Another object of the present invention provides a kind of device of realizing the two edge constant on-time modulation electric die mould control methods of above-mentioned switch converters, and its concrete scheme adopts:
Formed by voltage detecting circuit VS, turn-off time generator OFG, sawtooth generator SG, pulse modulator PM and drive circuit DR; Described voltage detecting circuit VS, turn-off time generator OFG, sawtooth generator SG, pulse modulator PM, drive circuit DR link to each other successively; Sawtooth generator SG links to each other with voltage detecting circuit VS; Turn-off time generator OFG links to each other with pulse modulator PM.
Under same inventive concept, corresponding to realizing that the two edge constant on-time modulation electric die mould control methods of switch converters have proposed two kinds of concrete implement devices:
1. device is comprised of voltage detecting circuit VS1, turn-off time generator OFG1, sawtooth generator SG1, pulse modulator PM1 and drive circuit DR1, and wherein: voltage detecting circuit VS1, turn-off time generator OFG1, sawtooth generator SG1, pulse modulator PM1, drive circuit DR1 link to each other successively; Sawtooth generator SG1 links to each other with voltage detecting circuit VS1; Turn-off time generator OFG1 links to each other with pulse modulator PM1.Device turn-off time generator OFG1 1. is comprised of subtracter SUB1, multiplier MU1, multiplier MU2, adder ADD1 and adder ADD2, and wherein: subtracter SUB1, multiplier MU1, adder ADD1 link to each other successively; Adder ADD2, multiplier MU2, adder ADD1 link to each other successively.Output voltage values and voltage reference value V
RefBe input to respectively anode and the negative terminal of subtracter SUB1; The output of subtracter SUB1 and COEFFICIENT K
1Input as multiplier MU1; Two constant on-times are as the input of adder ADD2; The output of adder ADD2 and COEFFICIENT K
2Input as multiplier MU2.Device pulse modulator PM1 1. by adder ADD3, subtracter SUB2, subtracter SUB3, comparator C MP1, comparator C MP2 and or a door OR form, wherein: adder ADD3, subtracter SUB2, comparator C MP1 or door OR link to each other successively; Subtracter SUB3, comparator C MP2 or door OR link to each other successively; Outside sawtooth generator SG1 links to each other with subtracter SUB3 with subtracter SUB2 respectively.
2. device is comprised of voltage detecting circuit VS2, turn-off time generator OFG2, sawtooth generator SG2, pulse modulator PM2 and drive circuit DR2, and wherein: voltage detecting circuit VS2, turn-off time generator OFG2, sawtooth generator SG2, pulse modulator PM2, drive circuit DR2 link to each other successively; Sawtooth generator SG2 links to each other with voltage detecting circuit VS2; Turn-off time generator OFG2 links to each other with pulse modulator PM2.Device turn-off time generator OFG2 2. is comprised of subtracter SUB4, subtracter SUB5, multiplier MU3, multiplier MU4, multiplier MU5, adder ADD4 and adder ADD5, and wherein: subtracter SUB4, multiplier MU3, adder ADD4, multiplier MU5, adder ADD5, subtracter SUB5 link to each other successively; Multiplier MU4, adder ADD4, subtracter SUB5 link to each other successively.Output voltage values and voltage reference value V
RefBe input to respectively anode and the negative terminal of subtracter SUB4; The output of subtracter SUB4 and COEFFICIENT K
3Input as multiplier MU3; Constant on-time and COEFFICIENT K
4Input as multiplier MU4; The output of adder ADD4 and COEFFICIENT K
5Input as multiplier MU5; The output of multiplier MU5 and constant C
1Input as adder ADD5; The output of adder ADD4 and adder ADD5 is input to respectively anode and the negative terminal of subtracter SUB5.Device pulse modulator PM2 2. forms by adder ADD6, subtracter SUB6, subtracter SUB7, comparator C MP3, comparator C MP4 and with door AND, wherein: adder ADD6, subtracter SUB6, comparator C MP3, link to each other successively with door AND; Subtracter SUB7, comparator C MP4, link to each other successively with door AND; Outside sawtooth generator SG2 links to each other with subtracter SUB7 with subtracter SUB6 respectively.
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the signal flow graph that the present invention adopts technical scheme.
Fig. 2 is that the embodiment of the invention one adopts technical scheme signal flow graph 1..
Fig. 3 is the signal flow graph of the turn-off time generator OFG1 of the embodiment of the invention one.
Fig. 4 is the signal flow graph of the pulse modulator PM1 of the embodiment of the invention one.
Fig. 5 is the circuit structure block diagram of the embodiment of the invention one.
Fig. 6 is in the embodiment of the invention one, output voltage, voltage reference value, constant on-time, turn-off time, sampling pulse signal and drive the schematic diagram that concerns between the signal.
Fig. 7 is the time-domain-simulation oscillogram of switch converters output voltage under limit of the embodiment of the invention one and the control of traditional constant on-time modulation electric die mould.
Fig. 8 is that the embodiment of the invention one and conventional P WM modulation electric die mould are controlled, the time-domain-simulation oscillogram of switch converters output voltage when load changing of traditional constant on-time modulation electric die mould control.
Fig. 9 is that the embodiment of the invention two adopts technical scheme signal flow graph 2..
Figure 10 is the signal flow graph of the turn-off time generator OFG2 of the embodiment of the invention two.
Figure 11 is the signal flow graph of the pulse modulator PM2 of the embodiment of the invention two.
Figure 12 is in the embodiment of the invention two, output voltage, voltage reference value, constant on-time, turn-off time, sampling pulse signal and drive the schematic diagram that concerns between the signal.
Figure 13 is the circuit structure block diagram of the embodiment of the invention two.
Among Fig. 7: a is the output voltage waveforms of traditional constant on-time modulation electric die mould control switch converter when stable state; B is the output voltage waveforms of the embodiment of the invention one when stable state.
Among Fig. 8: a is the output voltage waveforms of conventional P WM modulation electric die mould control switch converter when load changing; B is the output voltage waveforms of traditional constant on-time modulation electric die mould control switch converter when load changing; C is the output voltage waveforms of the embodiment of the invention one when load changing.
Embodiment
Also by reference to the accompanying drawings the present invention is done further detailed description below by concrete example.
Embodiment one
Adopt technical scheme 1.:
Fig. 2 illustrates, a kind of embodiment of the present invention is: the two edge constant on-time modulation electric die mould control methods of switch converters and device COT1 thereof, its COT1 device mainly is comprised of voltage detecting circuit VS1, turn-off time generator OFG1, sawtooth generator SG1, pulse modulator PM1 and drive circuit DR1.Voltage detecting circuit VS1 is used for obtaining output voltage information, turn-off time, generator OFG1 was for generation of the variable turn-off time, sawtooth generator SG1 is for generation of sawtooth waveforms and the sampling pulse signal of changeable frequency, pulse modulator PM1 is for generation of the control wave of constant conducting, shutoff, constant conducting, via drive circuit DR1, conducting and the shutoff of control switch converter TD switching tube.
Fig. 3 illustrates, and this routine turn-off time generator OFG1 is comprised of subtracter SUB1, multiplier MU1, multiplier MU2, adder ADD1 and adder ADD2.Subtracter SUB1, multiplier MU1, adder ADD1 link to each other successively; Adder ADD2, multiplier MU2, adder ADD1 link to each other successively.Output voltage values and voltage reference value V
RefBe input to respectively anode and the negative terminal of subtracter SUB1; The output of subtracter SUB1 and COEFFICIENT K
1Input as multiplier MU1; Two constant on-time T
ON1And T
ON2Input as adder ADD2; The output of adder ADD2 and COEFFICIENT K
2Input as multiplier MU2; The output of adder ADD1 is variable turn-off time t
Off
Fig. 4 illustrates, this routine pulse modulator PM1 by adder ADD3, subtracter SUB2, subtracter SUB3, comparator C MP1, comparator C MP2 and or a door OR form.Adder ADD3, subtracter SUB2, comparator C MP1 or door OR link to each other successively; Subtracter SUB3, comparator C MP2 or door OR link to each other successively; Outside sawtooth generator SG1 links to each other with subtracter SUB3 with subtracter SUB2 respectively.
This example adopts the device of Fig. 5, can realize easily and quickly above-mentioned control method.Fig. 5 illustrates, and the device of the two edge constant on-time modulation electric die mould control methods of this routine switch converters is comprised of the control device COT1 of converter TD and switching tube S.Fig. 6 is the schematic diagram that concerns between this routine output voltage, voltage reference value, constant on-time, turn-off time, sampling pulse signal and the driving signal.
Its course of work of the device of this example and principle are:
Control device COT1 adopts the course of work and the principle of two edge constant on-time modulation electric die mould controls to be: Fig. 5, Fig. 6 illustrate, at the actuating switch pipe zero hour of any one sampling pulse signal, this sampling pulse signal is produced by sawtooth generator SG1; Simultaneously, voltage detecting circuit VS1 detects the output voltage V of converter TD
O, and and reference voltage V
RefSubtract each other, its result multiply by COEFFICIENT K
1, obtain first signal f
1=K
1(V
O-V
Ref), as the input of adder ADD1.Two constant on-time T
ON1And T
ON2Addition, its result multiply by COEFFICIENT K
2, obtain secondary signal f
2=K
2(T
ON1+ T
ON2), as another input of adder ADD1.Adder ADD1 is output as variable turn-off time t
Off, i.e. t
Off=K
1(V
O-V
Ref)+K
2(T
ON1+ T
ON2).According to two constant on-time T
ON1, T
ON2With a variable turn-off time t
Off, the frequency of control sawtooth generator SG1, the sawtooth waveforms V of generation changeable frequency
SawIn sawtooth generator SG1, with a very little constant and sawtooth waveforms V
SawCompare, produce sampling pulse signal according to comparative result, be used for determining switch periods and sampling and outputting voltage.In pulse modulator PM1, with sawtooth waveforms V
Saw, constant on-time T
ON1, variable turn-off time t
OffCompare, produce the control wave of constant conducting, shutoff, constant conducting according to comparative result, via drive circuit DR1, conducting and the shutoff of control change device TD switching tube S.
In this example, the control impuls of switching tube S produces in pulse modulator PM1, and concrete producing method is: when each cycle began, switching tube S conducting, diode D turn-offed, and inductive current is begun to rise by initial value, and correspondingly output voltage also begins to rise; The constant time T of switching tube S conducting
ON1Rear shutoff, simultaneously diode D conducting, inductive current begins to descend immediately, and correspondingly output voltage also begins to descend.Through turn-off time t
OffAfter, pulse modulator PM1 makes control impuls become high level by low level, and again conducting of switching tube S, diode D turn-off again, the constant time T of switching tube S conducting
ON2Rear current period finishes.Constant on-time T
ON1By T
ON1With sawtooth waveforms V
SawRelatively produce, if V
Saw＜T
ON1, pulse modulator PM1 exports high level, otherwise output low level; Constant on-time T
ON2By T
ON1With t
OffSum is with sawtooth waveforms V
SawRelatively produce, if V
Saw(T
ON1+ t
Off), pulse modulator PM1 exports high level, otherwise output low level.
This routine converter TD is the Buck converter.
With Matlab/Simulink software this routine method is carried out the time-domain-simulation analysis, the result is as follows.
Fig. 7 is for adopting the time-domain-simulation oscillogram of traditional constant on-time modulation electric die mould control and switch converters of the present invention output voltage under limit, and component a, b be corresponding traditional constant on-time modulation electric die mould control and the present invention respectively.In Fig. 7, can find out, adopt the average output voltage of traditional constant on-time modulation electric die mould control (constant on-time is 6us) switch converters to be stabilized in the place greater than 1.5V, and adopt average output voltage of the present invention to be stabilized in 1.5V.As seen adopt the present invention to have the higher precision of voltage regulation, better steady-state behaviour.Simulated conditions: input voltage V
In=5V, output voltage fiducial value V
Ref=1.5V, inductance L=20uH, its equivalent series resistance of capacitor C=1420uF(are 30m Ω), load current I
o=1A, constant on-time T
ON1=T
ON2=3 μ s; COEFFICIENT K
1=4.44*10
-4, COEFFICIENT K
2=7/3.
Fig. 8 is for adopting the time-domain-simulation oscillogram of the control of conventional P WM modulation electric die mould, the control of traditional constant on-time modulation electric die mould and switch converters of the present invention output voltage when load changing, component a, b, the respectively corresponding conventional P WM modulation electric die mould control of c, the control of traditional constant on-time modulation electric die mould and the present invention.Among Fig. 8, load is changed to 10A by the 1A step when 6ms, adopts conventional P WM modulation electric die mould control (switching frequency is 50KHz) just can enter new stable state through behind about 1.82ms, output voltage peak-to-peak value fluctuation 654mV; Adopt traditional constant on-time modulation electric die mould control (constant on-time is 6us) to enter new stable state through behind about 0.4ms, output voltage peak-to-peak value fluctuation 538mV; And adopt switch converters of the present invention can enter rapidly new stable state, the adjustment time is 0.3ms, output voltage peak-to-peak value fluctuation 342mV.As seen switch converters of the present invention has good load transient performance.
Adopt technical scheme 2.:
Fig. 9 illustrates, the present invention adopts technical scheme embodiment 2. to be: the two edge constant on-time modulation electric die mould control methods of switch converters and device COT2 thereof, its COT2 device mainly is comprised of voltage detecting circuit VS2, turn-off time generator OFG2, sawtooth generator SG2, pulse modulator PM2 and drive circuit DR2.Fig. 9 and Fig. 2 are basic identical, and difference is: among Fig. 9 among the function of turn-off time generator OFG2 and pulse modulator PM2 and Fig. 2 the function of turn-off time generator OFG1 and pulse modulator PM1 different.Turn-off time generator OFG2 is for generation of total variable turn-off time, and is broken down into two turn-off times; Pulse modulator PM2 is for generation of the control wave of shutoff, constant conducting, shutoff.
Figure 10 illustrates, and adopts technical scheme turn-off time generator OFG2 2. to be comprised of subtracter SUB4, subtracter SUB5, multiplier MU3, multiplier MU4, multiplier MU5, adder ADD4 and adder ADD5.Subtracter SUB4, multiplier MU3, adder ADD4, multiplier MU5, adder ADD5, subtracter SUB5 link to each other successively; Multiplier MU4, adder ADD4, subtracter SUB5 link to each other successively.Output voltage values and voltage reference value V
RefBe input to respectively anode and the negative terminal of subtracter SUB4; The output of subtracter SUB4 and COEFFICIENT K
3Input as multiplier MU3; Constant on-time T
ONAnd COEFFICIENT K
4Input as multiplier MU4; The output of adder ADD4 is total variable turn-off time t
OffThe output of adder ADD4 and COEFFICIENT K
5Input as multiplier MU5; The output of multiplier MU5 and constant C
1As the input of adder ADD5, the output of adder ADD5 is a turn-off time t
Off2The output of adder ADD4 and adder ADD5 is input to respectively anode and the negative terminal of subtracter SUB5, and the output of subtracter SUB5 is another turn-off time t
Off1
Figure 11 illustrates, and adopts technical scheme pulse modulator PM2 2. to form by adder ADD6, subtracter SUB6, subtracter SUB7, comparator C MP3, comparator C MP4 and with door AND.Adder ADD6, subtracter SUB6, comparator C MP3, link to each other successively with door AND; Subtracter SUB7, comparator C MP4, link to each other successively with door AND; Outside sawtooth generator SG2 links to each other with subtracter SUB7 with subtracter SUB6 respectively.
Figure 12 is the present invention's output voltage, voltage reference value, constant on-time, turn-off time, sampling pulse signal and drive the schematic diagram that concerns between the signal when adopting technical scheme 2..The concrete course of work and principle are: Figure 12 illustrates, and at the on-off switching tube zero hour of any one sampling pulse signal, simultaneously, voltage detecting circuit VS2 detects the converter output voltage V
O, and and reference voltage V
RefSubtract each other, its result multiply by COEFFICIENT K
3, obtain the 3rd signal f
3=K
3(V
O-V
Ref), as the input of adder ADD4.With constant on-time T
ONMultiply by COEFFICIENT K
4, obtain the 4th signal f
4=K
4T
ON, as another input of adder ADD4.Adder ADD4 is output as total variable turn-off time t
Off, i.e. t
Off=K
3(V
O-V
Ref)+K
4T
ONAccording to total variable turn-off time t
Off, COEFFICIENT K is set
5And constant C
1, be broken down into two turn-off time t
Off2=K
5t
Off+ C
1, t
Off1=t
Off-t
Off2According to two turn-off time t
Off1, t
Off2With a constant on-time T
ON, the frequency of control sawtooth generator SG2, the sawtooth waveforms V of generation changeable frequency
Saw, again with sawtooth waveforms V
SawCompare with a very little constant, produce sampling pulse signal, be used for determining switch periods and sampling and outputting voltage.In pulse modulator PM2, with sawtooth waveforms V
Saw, constant on-time T
ON, turn-off time t
Off1Compare, produce the control wave of shutoff, constant conducting, shutoff according to comparative result, via drive circuit DR2, shutoff and the conducting of control change device switching tube.
Embodiment two
Figure 13 illustrates, and the converter TD of this example control is the single tube forward converter, and the control device of switching tube S adopts COT2.Prove by emulation equally, adopt single tube forward converter output voltage stabilization of the present invention, stable state accuracy is high, and the load transient performance is good.
The switch converters of the inventive method in can be used for above embodiment, also can be used for Buck
2The multiple circuit topologies such as converter, two-transistor forward converter, Cuk converter, Zeta converter, push-pull converter, Push-pull Forward Converter, half-bridge converter, full-bridge converter.
Claims (9)
1. two edge constant on-time modulation electric die mould control methods of a switch converters, it is characterized in that: detect output voltage in the zero hour of any one sampling pulse signal, output voltage values and voltage reference value are subtracted each other, and multiply by COEFFICIENT K, obtain signal f; Default one or two constant on-time T
1, T
2, and with the ON time addition, multiply by again COEFFICIENT K ', signal f ' obtained; After signal f and signal f ' addition, generate the variable turn-off time, adopt the control sequential of constant on-time and variable turn-off time composition, conducting and the shutoff of control switch converter switches pipe.
2. two edge constant on-time modulation electric die mould control methods of described switch converters according to claim 1, it is characterized in that: at the actuating switch pipe zero hour of any one sampling pulse signal, detect simultaneously output voltage, output voltage values and voltage reference value are subtracted each other, and multiply by COEFFICIENT K
1, obtain first signal f
1Default two constant on-times, and with both additions, multiply by again COEFFICIENT K
2, obtain secondary signal f
2With first signal f
1With secondary signal f
2After the addition, generate the variable turn-off time; According to two constant ON time and a variable turn-off time, the control sequential that each cycle adopts constant conducting, shutoff, constant conducting to form successively, conducting and the shutoff of control switch converter switches pipe.
3. two edge constant on-time modulation electric die mould control methods of described switch converters according to claim 1, it is characterized in that: at the on-off switching tube zero hour of any one sampling pulse signal, detect simultaneously output voltage, output voltage values and voltage reference value are subtracted each other, and multiply by COEFFICIENT K
3, obtain the 3rd signal f
3Default constant on-time, and multiply by COEFFICIENT K
4, obtain the 4th signal f
4With the 3rd signal f
3With the 4th signal f
4After the addition, generate the variable turn-off time, be broken down into again two turn-off times; According to a constant ON time and two turn-off times, each cycle adopts successively shutoff, constant conducting, turn-offs the control sequential that forms, shutoff and the conducting of control switch converter switches pipe.
4. a device of realizing claim 1 or the two edge constant on-time modulation electric die mould control methods of 2 or 3 described switch converters is characterized in that: be comprised of voltage detecting circuit VS, turn-off time generator OFG, sawtooth generator SG, pulse modulator PM and drive circuit DR; Described voltage detecting circuit VS, turn-off time generator OFG, sawtooth generator SG, pulse modulator PM, drive circuit DR link to each other successively; Sawtooth generator SG links to each other with voltage detecting circuit VS; Turn-off time generator OFG links to each other with pulse modulator PM.
5. device according to claim 4, it is characterized in that: described turn-off time generator OFG is comprised of subtracter SUB1, multiplier MU1, multiplier MU2, adder ADD1 and adder ADD2; Subtracter SUB1, multiplier MU1, adder ADD1 link to each other successively; Adder ADD2, multiplier MU2, adder ADD1 link to each other successively.Output voltage values and voltage reference value V
RefBe input to respectively anode and the negative terminal of subtracter SUB1; The output of subtracter SUB1 and COEFFICIENT K
1Input as multiplier MU1; Two constant on-times are as the input of adder ADD2; The output of adder ADD2 and COEFFICIENT K
2Input as multiplier MU2.
6. device according to claim 4 is characterized in that: described pulse modulator PM by adder ADD3, subtracter SUB2, subtracter SUB3, comparator C MP1, comparator C MP2 and or a door OR form; Adder ADD3, subtracter SUB2, comparator C MP1 or door OR link to each other successively; Subtracter SUB3, comparator C MP2 or door OR link to each other successively; Outside sawtooth generator SG links to each other with subtracter SUB3 with subtracter SUB2 respectively.
7. device according to claim 4, it is characterized in that: described turn-off time generator OFG is comprised of subtracter SUB4, subtracter SUB5, multiplier MU3, multiplier MU4, multiplier MU5, adder ADD4 and adder ADD5; Subtracter SUB4, multiplier MU3, adder ADD4, multiplier MU5, adder ADD5, subtracter SUB5 link to each other successively; Multiplier MU4, adder ADD4, subtracter SUB5 link to each other successively.Output voltage values and voltage reference value V
RefBe input to respectively anode and the negative terminal of subtracter SUB4; The output of subtracter SUB4 and COEFFICIENT K
3Input as multiplier MU3; Constant on-time and COEFFICIENT K
4Input as multiplier MU4; The output of adder ADD4 and COEFFICIENT K
5Input as multiplier MU5; The output of multiplier MU5 and constant C
1Input as adder ADD5; The output of adder ADD4 and adder ADD5 is input to respectively anode and the negative terminal of subtracter SUB5.
8. device COT according to claim 4 is characterized in that: pulse modulator PM forms by adder ADD6, subtracter SUB6, subtracter SUB7, comparator C MP3, comparator C MP4 and with door AND; Adder ADD6, subtracter SUB6, comparator C MP3, link to each other successively with door AND; Subtracter SUB7, comparator C MP4, link to each other successively with door AND; Outside sawtooth generator SG links to each other with subtracter SUB7 with subtracter SUB6 respectively.
9. device according to claim 4, described switch converters is Buck converter, Buck
2The converter of converter, Cuk converter, Zeta converter, single tube forward converter, two-transistor forward converter, push-pull converter, Push-pull Forward Converter, half-bridge converter and full-bridge converter topological structure.
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| CN201310005129.7A CN103066811B (en) | 2013-01-08 | 2013-01-08 | Switch converter double-edge constant breakover time modulation voltage type control method |
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| CN104779793A (en) * | 2015-04-27 | 2015-07-15 | 电子科技大学 | Breakover time generation circuit for BULK converter |
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| CN109787473A (en) * | 2019-02-19 | 2019-05-21 | 西南交通大学 | A kind of double edge modulation output voltage control methods of boost converter and device |
| CN109921625A (en) * | 2019-03-25 | 2019-06-21 | 西南交通大学 | A kind of pfc converter pulse frequency modulated mean value current control method and device |
| CN110118903A (en) * | 2019-04-19 | 2019-08-13 | 清华大学 | The equivalent full power hookup of electric power electric transformer DC port and control method |
| CN110445362A (en) * | 2019-08-19 | 2019-11-12 | 电子科技大学 | A kind of transient state enhancing circuit suitable for Buck converter |
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