CN203135692U - Dual-flange constant turn-off time modulation voltage type controlling device for switching converter - Google Patents
Dual-flange constant turn-off time modulation voltage type controlling device for switching converter Download PDFInfo
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- CN203135692U CN203135692U CN 201320006804 CN201320006804U CN203135692U CN 203135692 U CN203135692 U CN 203135692U CN 201320006804 CN201320006804 CN 201320006804 CN 201320006804 U CN201320006804 U CN 201320006804U CN 203135692 U CN203135692 U CN 203135692U
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Abstract
Disclosed in the utility model is a dual-flange constant turn-off time modulation voltage type controlling device for a switching converter. According to the relation between an output voltage and a voltage reference value, a controlling timing sequence formed by constant turning off, conduction, and constant turning off or a controlling timing sequence formed by conduction, constant turning off, and conduction is employed, thereby controlling the turning off and conduction of a switch tube of the switching converter. According to the utility model, the controlling device can be used for controlling switching converters that has various including topological structures and include a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single-tube forward converter, a double-tube forward converter, a push-pull converter, a push-pull forward converter, a half-bridge converter, and a full-bridge converter and the like. And the controlling device has the advantages of compensation network-free performance, simple controlling, fast transient response speed, and high voltage stabilization precision.
Description
Technical field
The utility model relates to a kind of control device of switch converters.
Background technology
In recent years, power electronic device technology and electric electronic current change technology constantly develop, and 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 the power main circuit again, mainly contain step-down (Buck), boost (Boost), buck (Buck-Boost), normal shock, instead swash, various topological structures such as half-bridge, full-bridge.Controller is used for the operating state of monitoring switch converters, and produces control wave control switch pipe, regulates the energy of supply load with stable output.For same switch converters, different control methods makes converter have 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 process error amplifier compensation back generation control voltage that obtains, and the sawtooth waveforms that will control voltage and fixed frequency 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 transient response speed fast, when switching between standby, dormancy, normal operation 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 shortcomings such as mapping is poor, COMPENSATION NETWORK DESIGN complexity, has been difficult to satisfy this demand of load.Traditional constant turn-off 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 began, switching tube turn-offed, and the converter output voltage descends; Through after the constant turn-off time, the switching tube conducting, output voltage rises, and when it rose to reference voltage, switching tube turn-offed 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.
The utility model content
The purpose of this utility model provides the two modulation electric die mould control device of constant turn-off time of edge of a kind of switch converters, makes it to have simultaneously transient response speed and higher steady precision fast, is applicable to the switch converters of various topological structures.
The two modulation electric die mould control device CFT of constant turn-off time of edge of a kind of switch converters are made up of voltage detecting circuit VS, ON time generator ONG, sawtooth generator SG, pulse modulator PM and drive circuit DR; Described voltage detecting circuit VS, ON time generator ONG, sawtooth generator (also claiming outside 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; ON time generator ONG links to each other with pulse modulator PM.
Under same utility model design, turn-off ON time modulation electric die mould control device for the two edge of switch converters and proposed two kinds of concrete implement devices:
Device ON time generator ONG 1. is made up 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.Voltage reference value V
RefBe input to anode and the negative terminal of subtracter SUB1 respectively with output voltage values; The output of subtracter SUB1 and COEFFICIENT K
1Input as multiplier MU1; Two constant turn-off times are as the input of adder ADD2; The output of adder ADD2 and COEFFICIENT K
2Input as multiplier MU2.Device pulse modulator PM 1. forms by adder ADD3, subtracter SUB2, subtracter SUB3, comparator C MP1, comparator C MP2 and with door AG, wherein: adder ADD3, subtracter SUB2, comparator C MP1, link to each other successively with door AG; Subtracter SUB3, comparator C MP2, link to each other successively with door AG; Outside sawtooth generator SG links to each other with subtracter SUB3 with subtracter SUB2 respectively.
Device ON time generator ONG 2. is made up 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.Voltage reference value V
RefBe input to anode and the negative terminal of subtracter SUB4 respectively with output voltage values; The output of subtracter SUB4 and COEFFICIENT K
3Input as multiplier MU3; Constant turn-off 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 anode and the negative terminal of subtracter SUB5 respectively.Device pulse modulator PM 2. by adder ADD6, subtracter SUB6, subtracter SUB7, comparator C MP3, comparator C MP4 and or a door OR forms, wherein: adder ADD6, subtracter SUB6, comparator C MP3 or door OR are continuous successively; Subtracter SUB7, comparator C MP4 or door OR link to each other successively; Outside sawtooth generator SG links to each other with subtracter SUB7 with subtracter SUB6 respectively.
Compared with prior art, the beneficial effects of the utility model are:
One, compares with prior PWM voltage-type switch converters, switch converters of the present utility model is when load changes, the variation of output voltage changes the size of ON time immediately, thereby the length of quick adjustment switch converters switching tube ON time has improved the mapping of converter.
Two, compare with existing P FM voltage-type switch converters, switch converters precision of voltage regulation height of the present utility model, steady-state behaviour is good; When the heavy load range, output voltage and inductive current transient state overshoot are little, and 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.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Description of drawings
Fig. 1 adopts the signal flow graph of technical scheme for the utility model.
Fig. 2 is that the utility model embodiment one adopts technical scheme signal flow graph 1..
Fig. 3 is the signal flow graph of the ON time generator ONG1 of the utility model embodiment one.
Fig. 4 is the signal flow graph of the pulse modulator PM1 of the utility model embodiment one.
Fig. 5 is the circuit structure block diagram of the utility model embodiment one.
Fig. 6 is among the utility model embodiment one, concerns schematic diagram between output voltage, voltage reference value, constant turn-off time, ON time, sampling pulse signal and the driving signal.
Fig. 7 is the time-domain-simulation oscillogram of switch converters output voltage under limit of the utility model embodiment one and traditional constant turn-off time modulation electric die mould control.
Fig. 8 is that the utility model embodiment 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 turn-off time modulation electric die mould control.
Fig. 9 is that the utility model embodiment two adopts technical scheme signal flow graph 2..
Figure 10 is the signal flow graph of the ON time generator ONG2 of the utility model embodiment two.
Figure 11 is the signal flow graph of the pulse modulator PM2 of the utility model embodiment two.
Figure 12 is among the utility model embodiment two, output voltage, voltage reference value, constant turn-off time, conducting, sampling pulse signal and drive the schematic diagram that concerns between the signal.
Figure 13 is the circuit structure block diagram of the utility model embodiment two.
Among Fig. 7: a is the output voltage waveforms of traditional constant turn-off time modulation electric die mould control switch converter when stable state; B is the output voltage waveforms of the utility model embodiment 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 turn-off time modulation electric die mould control switch converter when load changing; C is the output voltage waveforms of the utility model embodiment one when load changing.
Embodiment
Also by reference to the accompanying drawings the utility model 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 utility model is: the two modulation electric die mould control device CFT1 of constant turn-off time of edge of switch converters, its CFT1 device mainly is made up of voltage detecting circuit VS1, ON time generator ONG1, sawtooth generator SG1, pulse modulator PM1 and drive circuit DR1.Voltage detecting circuit VS1 is used for obtaining output voltage information, ON time generator OFG1 is for generation of variable ON 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 shutoff, conducting, constant shutoff, via drive circuit DR1, shutoff and the conducting of control switch converter TD switching tube.
Fig. 3 illustrates, and this routine ON time generator ONG1 is made up 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.Voltage reference value V
RefBe input to anode and the negative terminal of subtracter SUB1 respectively with output voltage values; The output of subtracter SUB1 and COEFFICIENT K
1As the input of multiplier MU1, multiplier MU1 is output as signal y
1Two constant turn-off time T
OFF1And T
OFF2Input as adder ADD2; The output of adder ADD2 and COEFFICIENT K
2As the input of multiplier MU2, multiplier MU2 is output as signal y
2The output of adder ADD1 is variable ON time t
On=y
1+ y
2
Fig. 4 illustrates, and this routine pulse modulator PM1 forms by adder ADD3, subtracter SUB2, subtracter SUB3, comparator C MP1, comparator C MP2 and with door AG.Adder ADD3, subtracter SUB2, comparator C MP1, link to each other successively with door AG; Subtracter SUB3, comparator C MP2, link to each other successively with door AG; 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 above-mentioned control method easily and quickly.Fig. 5 illustrates, and the two modulation electric die mould control device of constant turn-off time of edge of this routine switch converters are made up of the control device CFT1 of converter TD and switching tube S.Fig. 6 is the schematic diagram that concerns between this routine output voltage, voltage reference value, constant turn-off time, ON time, sampling pulse signal and the driving signal.
Its course of work of the device of this example and principle are:
Control device CFT1 adopts the course of work and the principle of two modulation electric die mould controls of constant turn-off time of edge to be: Fig. 5, Fig. 6 illustrate, at the on-off switching tube 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
0, with reference voltage V
RefWith output voltage V
0Subtract each other, its result multiply by COEFFICIENT K
1, obtain signal y
1=K
1(V
Ref-V
0), as the input of adder ADD1.Two constant turn-off time T
OFF1And T
OFF2Addition, its result multiply by COEFFICIENT K
2, obtain signal y
2=K
2(T
OFF1+ T
OFF2), as another input of adder ADD1.Adder ADD1 is output as variable ON time t
On, i.e. t
On=y
1+ y
2According to two constant turn-off time T
OFF1, T
OFF2With a variable turn-off time t
On, 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 turn-off time T
OFF1, variable ON time t
OnCompare, produce the control wave of constant shutoff, conducting, constant shutoff according to comparative result, via drive circuit DR1, shutoff and the conducting 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 turn-offed, diode D conducting, and inductive current is begun to descend by initial value, and correspondingly output voltage also begins to descend; Switching tube S turn-offs constant time T
OFF1Back conducting, diode D turn-offs simultaneously, and inductive current begins to rise immediately, and correspondingly output voltage also begins to rise.Through ON time t
OnAfter, pulse modulator PM1 makes control impuls become low level by high level, and switching tube S turn-offs again, diode D conducting again, and switching tube S turn-offs constant time T
OFF2Back current period finishes.Constant turn-off time T
OFF1By T
OFF1With sawtooth waveforms V
SawRelatively produce, if V
Saw＜T
OFF1, pulse modulator PM1 output low level, otherwise output high level; Constant turn-off time T
OFF2By T
OFF1With t
OnSum is with sawtooth waveforms V
SawRelatively produce, if V
Saw＞(T
OFF1+ t
On), pulse modulator PM1 output low level, otherwise output high 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 turn-off time modulation electric die mould control and switch converters of the present utility model output voltage under limit, and component a, b be corresponding traditional constant turn-off time modulation electric die mould control and the utility model respectively.In Fig. 7, as can be seen, adopt the average output voltage of traditional constant turn-off time modulation electric die mould control (the constant turn-off time is 14us) switch converters to be stabilized in the place less than 1.5V, and adopt average output voltage of the present utility model to be stabilized in 1.5V.As seen adopt and the utlity model has 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, capacitor C=1420uF (its equivalent series resistance is 30m Ω), load current I
o=1A, constant turn-off time T
OFF1=T
OFF2=7 μ s; COEFFICIENT K
1=1.905*10
-4, COEFFICIENT K
2=3/7.
Fig. 8 is for adopting the time-domain-simulation oscillogram of the control of conventional P WM modulation electric die mould, traditional constant turn-off time modulation electric die mould control and switch converters of the present utility model output voltage when load changing, component a, b, the respectively corresponding conventional P WM modulation electric die mould control of c, traditional constant turn-off time modulation electric die mould control and the utility model.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 turn-off time modulation electric die mould control (the constant turn-off time is 14us) to enter new stable state through behind about 0.57ms, output voltage peak-to-peak value fluctuation 757mV; And adopt switch converters of the present utility model can enter new stable state rapidly, the adjustment time is 0.46ms, output voltage peak-to-peak value fluctuation 604mV.As seen switch converters of the present utility model has good load transient performance.Adopt technical scheme 2.:
Fig. 9 illustrates, the utility model adopts technical scheme embodiment 2. to be: the two modulation electric die mould control device CFT2 of constant turn-off time of edge of switch converters, its CFT2 device mainly is made up of voltage detecting circuit VS2, ON time generator ONG2, 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 ON time generator ONG2 and pulse modulator PM2 and Fig. 2 the function of ON time generator ONG1 and pulse modulator PM1 different.ON time generator ONG2 is for generation of total variable ON time, and is broken down into two ON time; Pulse modulator PM2 is for generation of the control wave of conducting, constant shutoff, conducting.
Figure 10 illustrates, and adopts technical scheme ON time generator ONG2 2. to be made up 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.Voltage reference value V
RefBe input to anode and the negative terminal of subtracter SUB4 respectively with output voltage values; The output of subtracter SUB4 and COEFFICIENT K
3Input as multiplier MU3; Constant turn-off time T
OFFAnd COEFFICIENT K
4Input as multiplier MU4; The output of adder ADD4 is total variable ON time t
OnThe 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 an ON time t
On2The output of adder ADD4 and adder ADD5 is input to anode and the negative terminal of subtracter SUB5 respectively, and the output of subtracter SUB5 is another ON time t
On1
Figure 11 illustrates, adopt technical scheme pulse modulator PM2 2. by adder ADD6, subtracter SUB6, subtracter SUB7, comparator C MP3, comparator C MP4 and or a door OR form.Adder ADD6, subtracter SUB6, comparator C MP3 or door OR link to each other successively; Subtracter SUB7, comparator C MP4 or door OR link to each other successively; Outside sawtooth generator SG2 links to each other with subtracter SUB7 with subtracter SUB6 respectively.
Output voltage, voltage reference value, constant turn-off time, ON time, sampling pulse signal and drive the schematic diagram that concerns between the signal when 2. Figure 12 adopts technical scheme for the utility model.The concrete course of work and principle are: Figure 12 illustrates, and at the actuating switch pipe zero hour of any one sampling pulse signal, simultaneously, voltage detecting circuit VS2 detects the converter output voltage V
0, with reference voltage V
RefWith output voltage V
0Subtract each other, its result multiply by COEFFICIENT K
3, obtain signal y
3=K
3(V
Ref-V
0), as the input of adder ADD4.With constant turn-off time T
OFFMultiply by COEFFICIENT K
4, obtain signal y
4=K
4T
OFF, as another input of adder ADD4.Adder ADD4 is output as total variable ON time t
On, i.e. t
On=y
3+ y
4According to total variable ON time t
On, COEFFICIENT K is set
5And constant C
1, be broken down into two ON time t
On2=K
5t
On+ C
1, t
On1=t
On-t
On2According to two ON time t
On1, t
On2With a constant turn-off time T
OFF, 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 turn-off time T
OFF, ON time t
On1Compare, produce the control wave of conducting, constant shutoff, conducting according to comparative result, via drive circuit DR2, conducting and the shutoff 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 CFT2.Prove by emulation equally, adopt single tube forward converter output voltage stabilization of the present utility model, the stable state accuracy height, the load transient performance is good.
The switch converters of the utility model in can be used for above embodiment, also can be used for Buck
2Multiple circuit topologies such as converter, two-transistor forward converter, Cuk converter, Zeta converter, push-pull converter, push-pull ortho-exciting converter, half-bridge converter, full-bridge converter.
Claims (6)
1. the two modulation electric die mould control device of constant turn-off time of edge of switch converters is characterized in that: be made up of voltage detecting circuit VS, ON time generator ONG, sawtooth generator SG, pulse modulator PM and drive circuit DR; Described voltage detecting circuit VS, ON time generator ONG, 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; ON time generator ONG links to each other with pulse modulator PM.
2. two modulation electric die mould control device of constant turn-off time of edge of a kind of switch converters according to claim 1, it is characterized in that: ON time generator ONG is made up 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.
3. two modulation electric die mould control device of constant turn-off time of edge of a kind of switch converters according to claim 1 is characterized in that: pulse modulator PM forms by adder ADD3, subtracter SUB2, subtracter SUB3, comparator C MP1, comparator C MP2 and with door AG; Adder ADD3, subtracter SUB2, comparator C MP1, link to each other successively with door AG; Subtracter SUB3, comparator C MP2, link to each other successively with door AG; Sawtooth generator SG links to each other with subtracter SUB3 with subtracter SUB2 respectively.
4. two modulation electric die mould control device of constant turn-off time of edge of a kind of switch converters according to claim 1, it is characterized in that: ON time generator ONG is made up 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.
5. two modulation electric die mould control device of constant turn-off time of edge of a kind of switch converters according to claim 1 is characterized in that: pulse modulator PM by adder ADD6, subtracter SUB6, subtracter SUB7, comparator C MP3, comparator C MP4 and or a door OR form; Adder ADD6, subtracter SUB6, comparator C MP3 or door OR link to each other successively; Subtracter SUB7, comparator C MP4 or door OR link to each other successively; Sawtooth generator SG links to each other with subtracter SUB7 with subtracter SUB6 respectively.
6. two modulation electric die mould control device of constant turn-off time of edge of a kind of switch converters as claimed in claim 1, it is characterized in that: switch converters can be the converter of various topological structures, is one of following converter: Buck converter, Buck
2Converter, Cuk converter, Zeta converter, single tube forward converter, two-transistor forward converter, push-pull converter, push-pull ortho-exciting converter, half-bridge converter and full-bridge converter.
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|---|---|---|---|
| CN 201320006804 CN203135692U (en) | 2013-01-08 | 2013-01-08 | Dual-flange constant turn-off time modulation voltage type controlling device for switching converter |
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|---|---|---|---|
| CN 201320006804 CN203135692U (en) | 2013-01-08 | 2013-01-08 | Dual-flange constant turn-off time modulation voltage type controlling device for switching converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617315A (en) * | 2013-11-20 | 2014-03-05 | 合肥工业大学 | Modeling method on basis of effective duty cycle for phase-shifted full-bridge ZVS (zero voltage switching) converter |
-
2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617315A (en) * | 2013-11-20 | 2014-03-05 | 合肥工业大学 | Modeling method on basis of effective duty cycle for phase-shifted full-bridge ZVS (zero voltage switching) converter |
| CN103617315B (en) * | 2013-11-20 | 2016-08-17 | 合肥工业大学 | A kind of phase shifted full bridge ZVS converter modeling method based on effective duty cycle |
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Granted publication date: 20130814 Termination date: 20160108 |