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CN203562953U - Adaptive compensation ramp generator - Google Patents

Adaptive compensation ramp generator Download PDF

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Publication number
CN203562953U
CN203562953U CN201320749436.1U CN201320749436U CN203562953U CN 203562953 U CN203562953 U CN 203562953U CN 201320749436 U CN201320749436 U CN 201320749436U CN 203562953 U CN203562953 U CN 203562953U
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China
Prior art keywords
voltage
equal
less
produces
switching regulator
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Chinese (zh)
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不公告发明人
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Suzhou Baker Microelectronics Co Ltd
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Suzhou Baker Microelectronics Co Ltd
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Abstract

An adaptive compensation ramp generator is used in a DC-DC converter. The adaptive compensation ramp generator is characterized in that a switching regulator is sensitive to unregulated input voltage and provides adjusted output voltage, a compensation ramp generating circuit in the switching regulator is provided with a controlled switching element and a detection resistor, the resistor provides a signal which is in direct proportion to current flowing through the switching element and is used for controlling operation of the switching regulator, and a device used for storing energy and including an inductor is arranged.

Description

A kind of adaptive equalization ramp generator
Technical field
The present invention relates to a compensation slope, more specifically, the present invention is relevant for adaptive equalization ramp generator, for direct current pattern to DC converter.
Background technology
When reference voltage and current detection voltage intersect, compensation slope changes gradient.The DC-to-DC of traditional Controlled in Current Mode and Based (DC/DC) converter is operated in higher than 50% duty ratio, need a compensation ramp signal being superimposed upon on current detection signal, this signal is used as controlling parameter, avoids " open-loop unstable " or " subharmonic oscillation ".
For fear of subharmonic oscillation, when conducting, the gradient of current detection voltage
Figure 2013207494361100002DEST_PATH_IMAGE002
must be greater than the gradient of reflection
Figure 2013207494361100002DEST_PATH_IMAGE004
, reflection gradient is the variation of end amplitude He its beginning amplitude when next cycle starts of current detection voltage, divided by opening time,
Figure 51586DEST_PATH_IMAGE002
conventionally be less than
Figure 591896DEST_PATH_IMAGE004
one is greater than 50% duty ratio.Therefore in order to make
Figure 433950DEST_PATH_IMAGE002
be greater than
Figure 891476DEST_PATH_IMAGE004
, a ramp signal with extra gradient is added on this current detection signal.
In the past, compensation ramp signal passes through the oscillator timing signal of expanding system, and it is added on current detection voltage or it and is removed from the output voltage of error amplifier.The necessary gradient of compensation ramp signal depends on the value of input and output voltage with the inductor using of DC to DC converter.In transformer coupled system, this necessary gradient also depends on the turn ratio of transformer.
The gradient that legacy system arranges ramp signal adapts to the condition under worst case: maximum output voltage (only at variable voltage output system) and minimum input voltage.The condition that adapts to worst case by design gradient, in normal working conditions, the amplitude on this gradient and slope is higher than required amplitude.For example, in wide input range system, this amplitude conventionally than for the required amplitude of stability high two or three times.
Compensation ramp signal has excessive gradient two main shortcomings.The first, system maximum available output power is restricted; Slope is steeper, under current restriction, just has lower effective current amount.The second, the phase margin of amplitude control loop reduces.
The invention provides a circuit, this circuit in the switching regulator of this type, produce one compensation ramp signal, switching regulator to unadjusted input voltage (
Figure 2013207494361100002DEST_PATH_IMAGE006
) sensitivity, and provide an output voltage regulating (
Figure 2013207494361100002DEST_PATH_IMAGE008
).This circuit comprise one detect resistance ( ), this resistance provides a signal, and this signal is proportional with the electric current that flows through switching regulator; The energy storage equipment that contains an inductance (L); The amplifying device with predetermined gain (A), is used for amplifying the signal from detecting resistance.This signal is used to the operation of control switch pressurizer.
This compensation ramp circuit comprises, produces the device of a compensation ramp voltage signal, this signal have gradient (
Figure DEST_PATH_IMAGE012
), this gradient meets equation
Figure 147926DEST_PATH_IMAGE012
>(A*
Figure 596487DEST_PATH_IMAGE008
-B*
Figure 925837DEST_PATH_IMAGE006
) * C, A≤1 wherein, B≤1, C is a constant, it depends on R, L and the magnetic coupling parameter relevant to energy storage equipment.Circuit comprises device, and this device is the compensation ramp voltage stack fool who produces from detecting on the signal of resistance, and like this, the stability of switching regulator can be guaranteed.
Parameter A, B, C chooses according to the type of switching regulator.At preferred version, for generation of thering is gradient
Figure 187054DEST_PATH_IMAGE012
the device of compensation ramp signal comprise, the device to output voltage sensitivity, provides first signal, this signal and the output voltage result after divided by the first preset value equates; Device to input voltage sensitivity, provides secondary signal, and this signal and the input voltage result after divided by the second preset value equates; Also have a device, its produces a proportional signal of difference to the first secondary signal.
Summary of the invention
Amplitude and gradient that a main purpose of the present invention is Optimization Compensation ramp signal, under limiting condition, can obtain maximum effective current.
Another object of the present invention is to provide an adaptive equalization ramp generator, and it has an outside spreading resistance, in the whole input and output voltage scope of DC to DC converter and the frequency range of adjustable frequency system, produces necessary slope.
Another object of the present invention is to adopt the fixing spreading resistance in inside in fixed frequency system and applicable inductor in limited range.
Technical solution of the present invention:
In the declarative procedure of following preferred version of the present invention, these objects and further object, and advantage of the present invention will get across.
Contrast patent documentation: CN200956562Y phase compensator 200620131372.9 for AC induction motor controller
Accompanying drawing explanation:
Fig. 1 is the theory diagram of conventional buck DC to DC converter, and this converter has a compensation ramp generator;
Fig. 2 is the sequential chart of circuit diagram in corresponding diagram 1;
Fig. 3 is the circuit diagram of buck converter in Fig. 1, the compensation ramp generator circuit that it contains a traditional fixed elevation;
Fig. 4 is the circuit diagram of ramp generator of the present invention;
Fig. 5 is another circuit diagram for the ramp generator of dc/dc boost converter of the present invention;
Fig. 6 a is another circuit diagram for the ramp generator of DC-DC buck converter of the present invention;
Fig. 6 b is the circuit diagram of another DC-DC buck converter, similar to Fig. 6 a, and Fig. 6 b has shown an error voltage source;
Fig. 7 is the block diagram of the DC-DC flyback converter that contains ramp generator of the present invention;
Fig. 8 is the block diagram of the DC-DC buck-boost converter that contains ramp generator of the present invention;
Fig. 9 is the block diagram of the DC-DC forward converter that contains ramp generator of the present invention;
Figure 10 is also the circuit diagram of another ramp generator of the present invention.
Embodiment:
About Fig. 1 and Fig. 2, Fig. 1 is the theory diagram of current-mode step-down (or progressively reducing) DC to DC converter 10, and this converter is operated in and surpasses 50% duty ratio, and contains a compensation ramp generator 12.Fig. 2 is the sequential chart corresponding with circuit 10 in Fig. 1.Fig. 2 c has illustrated and has passed through resistance
Figure 918250DEST_PATH_IMAGE010
the gradient of current detection signal
Figure 597099DEST_PATH_IMAGE002
gradient with reflection
Figure 413746DEST_PATH_IMAGE004
,
Figure 839173DEST_PATH_IMAGE010
both end voltage is
Figure DEST_PATH_IMAGE014
.A DC to DC converter has the signal of specific DC level to be transformed into another DC level one.Buck converter 10 comprises a mains switch 14, and it can be a field-effect transistor; Detect resistance be connected to input voltage source
Figure 557783DEST_PATH_IMAGE006
and between mains switch 14; A slope spreading resistance
Figure DEST_PATH_IMAGE016
, be connected to resistance
Figure 425508DEST_PATH_IMAGE010
and between switch 14, voltage
Figure DEST_PATH_IMAGE018
resistance
Figure 762948DEST_PATH_IMAGE016
the voltage drop at two ends,
Figure 468736DEST_PATH_IMAGE006
there is gradient
Figure 866219DEST_PATH_IMAGE012
; Current amplifier
Figure DEST_PATH_IMAGE020
,
Figure 155993DEST_PATH_IMAGE006
and voltage
Figure 297124DEST_PATH_IMAGE018
it is its input; Filter assemblies 16, is connected to mains switch and load
Figure DEST_PATH_IMAGE022
between.Filter assemblies 16 comprises capacitor
Figure DEST_PATH_IMAGE024
, inductance L and diode D.Output voltage
Figure 919735DEST_PATH_IMAGE008
an input at error amplifier 11 is provided.Error amplifier 11 is by an amplifier
Figure DEST_PATH_IMAGE026
form amplifier
Figure 268119DEST_PATH_IMAGE008
with reference voltage
Figure DEST_PATH_IMAGE028
relatively.
Flow through the electric current of mains switch 14
Figure DEST_PATH_IMAGE030
(Fig. 2 b) is by resistance detect.The electric current detecting is used to disconnecting power switch 14.Resistance measurement has gradient compensation ramp voltage
Figure DEST_PATH_IMAGE034
, and much larger than detect resistance ( ).
System clock 18 or oscillator, provide a clock pulse (Fig. 2 a) gives master flip-flop FF40, within each cycle, actuating switch 14.Picture Fig. 2 a, 2b, what in 2c, illustrate is the same, clock pulse
Figure DEST_PATH_IMAGE038
make switch 14 conductings, cause electric current to flow through switch
Figure 323953DEST_PATH_IMAGE030
and resistance
Figure 325669DEST_PATH_IMAGE010
.Voltage
Figure 746286DEST_PATH_IMAGE014
waveform and the waveform of source current mirror image each other.
Compensation ramp generator 12 is the timing signal of receiving system clock 18 also
Figure DEST_PATH_IMAGE040
and voltage
Figure 343490DEST_PATH_IMAGE006
with
Figure 519256DEST_PATH_IMAGE008
.Compensation ramp generator 12 produces a compensation ramp signal 21, and this signal has voltage
Figure DEST_PATH_IMAGE042
(Fig. 2 d) and gradient are
Figure DEST_PATH_IMAGE044
=
Figure DEST_PATH_IMAGE046
, wherein
Figure DEST_PATH_IMAGE048
it is the mutual conductance of voltage current transducer 42.
Figure DEST_PATH_IMAGE050
adjust ramp signal 21 and start transient voltages, voltage current transducer 42 moves horizontally compensation ramp signal until the voltage levvl of input voltage, and produces a compensation ramp signal 43 after moving horizontally.
The voltage of the compensation ramp signal 43 after moving horizontally is
Figure 192289DEST_PATH_IMAGE034
,
Figure 416597DEST_PATH_IMAGE034
it is slope spreading resistance
Figure 41876DEST_PATH_IMAGE016
the voltage drop at two ends.Compensation ramp generator 12 also can use ,
Figure 863387DEST_PATH_IMAGE008
,
Figure DEST_PATH_IMAGE052
, the output signal of trigger 40 and direct current threshold voltage
Figure DEST_PATH_IMAGE054
produce compensation ramp signal 21, depend on the structure of the compensation ramp generator circuit 12 of employing.
The output signal 15 of error amplifier 11, is input to comparator 13, in comparator 13, and this output signal and amplifying signal 23(Fig. 2 g) compare.Amplifying signal 23 is that switching current detects voltage
Figure 508696DEST_PATH_IMAGE014
with
Figure 752595DEST_PATH_IMAGE034
(Fig. 2 f) after amplifying and
Figure DEST_PATH_IMAGE056
.When improved current detection signal 23 equals the output signal 15 of error amplifier 11, comparison signal 17(Fig. 2 h of comparator 13 outputs).Comparison signal 17 is input to trigger 40 and replacement trigger 40.
Drive control signal 40(Fig. 2 i of trigger 40 outputs), this signal is by driving 19 cut-off switch 16.Mention especially Fig. 2 h and Fig. 2 i, when comparison signal 17 is very high, the signal 41 in trigger 44 declines, and switch 14 is just disconnected.Trigger output signal 41 keeps low state until receive next clock pulse
Figure 66902DEST_PATH_IMAGE038
.Thereby the maximum available output power of error amplifier 11 has limited the obtainable maximum current of switch 14 (that is to say, maximum effectively limiting voltage has served as current limit).In most systems, the maximum output voltage of error amplifier is internal limitations, for current limit being set to required value
The condition of the power stability of tradition DC to DC converter is:
≥
Figure 158934DEST_PATH_IMAGE004
-
Figure DEST_PATH_IMAGE058
1
Wherein
Figure 585236DEST_PATH_IMAGE012
the compensation ramp voltage signal that equals to move horizontally
Figure 506662DEST_PATH_IMAGE034
gradient,
Figure 956098DEST_PATH_IMAGE058
current detection voltage while equaling conducting
Figure 388217DEST_PATH_IMAGE014
gradient,
Figure 341129DEST_PATH_IMAGE004
equal to reflect gradient (during namely conducting, the variation when end amplitude of current detection voltage and next turn-on cycle start between its beginning amplitude, divided by the value obtaining opening time).
Converter to the current-mode of a step-down DC-DC, in gradient formula 1
Figure DEST_PATH_IMAGE060
be defined as follows:
=
Figure DEST_PATH_IMAGE062
*
Figure 435435DEST_PATH_IMAGE010
， 2
Figure 671245DEST_PATH_IMAGE004
= ， 3
Wherein
Figure DEST_PATH_IMAGE066
the saturation voltage of power field effect pipe,
Figure DEST_PATH_IMAGE068
the voltage of forward biased diode.
Utilize formula 1, the condition of the stability of compensation slope gradient is:
Figure 435588DEST_PATH_IMAGE012
≥
Figure 967326DEST_PATH_IMAGE004
-
Figure 125775DEST_PATH_IMAGE058
=
Figure DEST_PATH_IMAGE070
（
Figure 522865DEST_PATH_IMAGE008
-
Figure DEST_PATH_IMAGE072
+
Figure DEST_PATH_IMAGE074
）。4
In the high system of frequency,
Figure DEST_PATH_IMAGE076
, therefore,
Figure DEST_PATH_IMAGE078
negligible.So just become:
Figure 339959DEST_PATH_IMAGE012
>（A*
Figure 985704DEST_PATH_IMAGE008
-B*
Figure 297737DEST_PATH_IMAGE006
）*C 5
A≤1 wherein, B≤1, C is a constant, depends on
Figure 861440DEST_PATH_IMAGE010
, L, n(n=
Figure DEST_PATH_IMAGE080
/
Figure DEST_PATH_IMAGE082
turn ratio) and
Figure DEST_PATH_IMAGE084
(primary inductance of the transformer adopting in switching circuit).
Compensation ramp signal 43(Fig. 1 after moving horizontally) required minimal slope in, for the DC to DC converter type of most of Controlled in Current Mode and Based, this gradient can be expressed with the form of formula 5.Especially, for buck converter, booster converter, flyback converter, forward converter and buck-boost converter, the first-selected parameter of formula 5 is summarized as follows:
Figure DEST_PATH_IMAGE086
The gradient on compensation slope
Figure DEST_PATH_IMAGE087
only have when it is positive number or zero just meaningful.
About Fig. 3, decompression converter circuit 31 and traditional compensation ramp generator circuit 33 are illustrated.The principle of other similar embodiments, refers to and has identical parameters/title.Transistor Q12 and resistance realize and in Fig. 1, compensate ramp circuit piece 12 and voltage to power pack 42.In circuit 31,
Figure DEST_PATH_IMAGE090
/
Figure 924861DEST_PATH_IMAGE089
timing signal with oscillator
Figure DEST_PATH_IMAGE092
gradient, be provided with compensation ramp voltage
Figure DEST_PATH_IMAGE093
gradient, compensation ramp voltage there is gradient
Figure 182536DEST_PATH_IMAGE087
.Except the compensation ramp voltage producing
Figure 235943DEST_PATH_IMAGE093
have this shortcoming of fixing gradient, circuit 31 has sensitive, because base stage-emitter voltage of transistor Q12 has the temperature coefficient of approximately-0.3%/° K.
About Fig. 4, together with 1, one of form, be used for producing a compensation ramp voltage signal
Figure DEST_PATH_IMAGE094
adaptive circuit 20, there is minimal slope
Figure DEST_PATH_IMAGE095
, = , for the type of most of DC to DC converter, this circuit is illustrated.Circuit 20 has produced the best minimal slope that has compensation ramp signal 21, for the DC to DC converter of particular type, according to form 1, choose constant A, B, C.As long as choose A and B, they can be diversified, like this
Figure 160408DEST_PATH_IMAGE087
just be more than or equal to the required gradient obtaining according to form 1.(namely in order to guarantee the stability of system) C is also diversified and be greater than the value in table 1.But the preferred value that the value of A and B departs from table 1 is far away, the slope of generation is just higher, and the effective current under current limliting is just less, because the maximum output voltage of error amplifier is constant.
Adaptive equalization slope generating circuit 20 comprises two voltage dividers 22,24.First voltage divider 22 dividing potential drop input voltages
Figure DEST_PATH_IMAGE097
second voltage divider pressure-dividing output voltage
Figure DEST_PATH_IMAGE098
.For example,, for booster converter
Figure 204456DEST_PATH_IMAGE097
≤
Figure 898743DEST_PATH_IMAGE098
, to buck converter
Figure DEST_PATH_IMAGE100
.
Input voltage by the first voltage divider 22 dividing potential drops, voltage divider 22 has the resistance 26,28 of two series connection: first resistance 26 resistances are (1/B-1) * R ohm, and the second resistance 28 resistances are R ohm, and like this, the dividing potential drop on B point is
Figure 275247DEST_PATH_IMAGE097
* B, output voltage
Figure 732773DEST_PATH_IMAGE098
by the second voltage divider 24 dividing potential drops, voltage divider 24 has the resistance 29,30 of two series connection, and first resistance 29 resistances are (1/A-1) * R ohm, and the second resistance 30 resistances are R ohm, and like this, the dividing potential drop on A point is
Figure 281566DEST_PATH_IMAGE098
* A.Dividing potential drop b*
Figure 995706DEST_PATH_IMAGE097
as two inputs of voltage-controlled current source 32, this voltage-controlled current source has two inputs and an output 38.
Voltage-controlled current source 32 comprises a buffer amplifier 34, and this amplifier is connected to spreading resistance with a feedback loop operation amplifier 36, this amplifier is connected to spreading resistance
Figure 523957DEST_PATH_IMAGE089
, between transistor Q and diode D1.Because operational amplifier 36 is feedback loop amplifiers, ideal situation, it is current sinking not, so flow through spreading resistance electric current be
Figure DEST_PATH_IMAGE104
=
Figure DEST_PATH_IMAGE106
.6
The output of current source 38 is connected to capacitor
Figure DEST_PATH_IMAGE108
, capacitor voltage compensation ramp signal gradient
Figure 934002DEST_PATH_IMAGE095
become
Figure DEST_PATH_IMAGE112
, electric capacity
Figure 314430DEST_PATH_IMAGE110
by the collector current of transistor Q
Figure DEST_PATH_IMAGE114
charging.If transistor Q has very high β, so
Figure 113759DEST_PATH_IMAGE114
=
Figure DEST_PATH_IMAGE116
= (for example β is approximately 100 or higher).Resistance
Figure 761778DEST_PATH_IMAGE089
control capacitance the growth rate of middle voltage (the namely charge rate of electric capacity).The voltage that the gradient of compensation ramp signal 21 has
Figure 820650DEST_PATH_IMAGE112
be:
Figure 859014DEST_PATH_IMAGE095
= =
Figure DEST_PATH_IMAGE124
=
Figure DEST_PATH_IMAGE126
(A*
Figure 88132DEST_PATH_IMAGE098
-B*
Figure 731603DEST_PATH_IMAGE097
) 7
Wherein the constant C in formula 5=
Figure DEST_PATH_IMAGE128
* .
When each end cycle, electric capacity
Figure DEST_PATH_IMAGE130
switch S discharge capacity
Figure 481177DEST_PATH_IMAGE110
.Switch S in conducting state until the beginning (when main switch 14 conducting again) of next clock cycle or almost arrive the next clock cycle and go over half.
Electric capacity
Figure 622308DEST_PATH_IMAGE110
, resistance
Figure 182602DEST_PATH_IMAGE089
,
Figure DEST_PATH_IMAGE132
be worth, obtained the essential value of constant C in formula 5.
In formula 7, constant must be more than or equal to according to the value of the constant C of converter in form 1.For example, booster converter,
Figure DEST_PATH_IMAGE134
>
Figure DEST_PATH_IMAGE135
8
Therefore, <
Figure DEST_PATH_IMAGE137
About Fig. 5 and table 1, to DC to DC converter, A or B are 1.Therefore, circuit 20 can abbreviation, by removing buffer amplifier 34 and operational amplifier 36, and with single-transistor Q2 replacement amplifier 36.Compensation slope generating circuit 40 for booster converter is explained at Fig. 5.The ramp generator circuit 40 that boosts depends on the general compensation ramp generator circuit 20 of improved in Fig. 4, and general circuit 20 has been modified, to reflect booster converter A, and B, the preferred value of C.
At this preferred version, for boost converter circuit 40, A approximates 0.5, B and approximates 1, C and approximate 2 / L.Booster converter ramp generator circuit 40 contains a voltage-controlled current source 42, and this current source is by two bipolar transistor Q1, and Q2 forms.Transistor Q1 is to output voltage sensitivity, transistor Q2 is to input voltage responsive.At this preferred version, transistor Q1 is PNP transistor, and it is used as an emitter follower.The base stage of transistor Q1 is connected to the first voltage divider 44, and this voltage divider has first resistance
Figure DEST_PATH_IMAGE142
, its resistance is R ohm,
Figure 178873DEST_PATH_IMAGE142
with the second resistance
Figure DEST_PATH_IMAGE144
series connection,
Figure 655990DEST_PATH_IMAGE144
resistance is R ohm, and like this, the dividing potential drop that A is ordered is exactly 0.5 .
The emitter of transistor Q1 passes through resistance
Figure DEST_PATH_IMAGE146
be biased into the first electromotive force ,
Figure 145506DEST_PATH_IMAGE146
resistance is R ohm, guarantees that transistor Q1 is operated in linear work district.The collector electrode of transistor Q1 is connected to ground.
At this preferred version, transistor seconds Q2 is a disjoint set electrode PNP transistor.Two transistorized base stages and emitter link together and also can replace this disjoint set electrode PNP transistor.40 pairs, circuit flows through many collector electrode C1 of transistor Q2, the sensitive of the electric current of C2.The emitter of transistor Q2 is connected to the emitter of transistor Q1, and like this, the base voltage of transistor Q2 is also 0.5
Figure DEST_PATH_IMAGE148
.A collector electrode of transistor Q2 is connected to its base stage and spreading resistance
Figure 742709DEST_PATH_IMAGE089
.
Transistor Q2 is as a current mirror job, because flow through resistance electric current
Figure 76662DEST_PATH_IMAGE114
be mirror image and output to electric capacity
Figure 363287DEST_PATH_IMAGE110
.Electric capacity by switch S, discharge and recharge, produce compensation ramp voltage
Figure 37031DEST_PATH_IMAGE112
.
At booster converter, due to B approximate 1, the second voltage divider voltage ratio be 1(namely, voltage divider is unnecessary (not existing)).So voltage
Figure 511874DEST_PATH_IMAGE097
until be supplied to resistance
Figure 274294DEST_PATH_IMAGE089
just by dividing potential drop.Voltage
Figure 19659DEST_PATH_IMAGE097
pass through resistance
Figure 537228DEST_PATH_IMAGE089
be connected to transistor Q2.Resistance
Figure 437050DEST_PATH_IMAGE089
, electric capacity
Figure 65478DEST_PATH_IMAGE110
the split ratio of two PNP collector electrodes, together with
Figure DEST_PATH_IMAGE149
with , obtain the constant C in formula 5.
About Fig. 6 a, illustrated a compensation slope circuit for generating for buck converter 50.In circuit for generating 50 functions of voltage-dropping type compensation slope, be equivalent to the general indemnity ramp circuit 20 in Fig. 4, still, voltage-dropping type compensation ramp circuit object is preferred parameter definite in instruction card 1.Shown in picture table 1, for buck convertor, A approximates 1, B and approximately due to 0.5, C, approximates 2
Figure DEST_PATH_IMAGE151
.
Buck converter slope circuit for generating 50 is similar to booster converter compensation ramp circuit 40, is that voltage-dropping type slope circuit for generating 50 also has a voltage divider 52, and two bipolar transistor Q3, Q4, an electric capacity
Figure 419066DEST_PATH_IMAGE110
and spreading resistance
Figure 868501DEST_PATH_IMAGE089
.But at voltage-dropping type compensation slope circuit for generating 50, the emitter of transistor Q3 is connected to collector electrode and the base stage of transistor Q4.
Voltage divider 52 has the first resistance
Figure 972724DEST_PATH_IMAGE142
with the second resistance
Figure 191215DEST_PATH_IMAGE144
, resistance
Figure DEST_PATH_IMAGE153
series connection, each resistance is R ohm.The first voltage divider 52 is connected to the first electromotive force
Figure 552052DEST_PATH_IMAGE097
, the voltage that B is ordered is like this 0.5
Figure DEST_PATH_IMAGE155
.Therefore, the base voltage of transistor Q3 is 0.5* .The collector electrode of transistor Q3 is connected to
Figure 459014DEST_PATH_IMAGE097
.Resistance
Figure 532012DEST_PATH_IMAGE146
resistance is R ohm, and it guarantees that transistor Q3 is operated in linear work district.In buck converter, A approximates 1, so
Figure DEST_PATH_IMAGE157
be directly connected to transistor Q4.
At this preferred version, transistor Q4 is disjoint set electrode PNP transistor, and its a collector electrode C2 is connected to the emitter of transistor Q3 and its base stage.As previously mentioned, two transistors also can replace separated collector transistor.Another collector electrode C1 is connected to electric capacity
Figure 123137DEST_PATH_IMAGE110
.The emitter of transistor Q4 is connected to resistance
Figure 219269DEST_PATH_IMAGE089
, the emitter of transistor Q3 arranges resistance
Figure 727611DEST_PATH_IMAGE089
and the voltage between the Base-Emitter of transistor Q4.
Transistor Q4, as a diode operation, looks like a shunt in function.It is divided into two equal parts its emitter current
Figure DEST_PATH_IMAGE159
with
Figure 484477DEST_PATH_IMAGE114
(if C1, the split ratio of C2 is 1/2 to 1/2), resistance
Figure 623334DEST_PATH_IMAGE089
,
Figure 269079DEST_PATH_IMAGE098
be provided with this emitter current with the emitter voltage of transistor Q3.
Figure 581111DEST_PATH_IMAGE159
changed electric capacity
Figure 566385DEST_PATH_IMAGE110
.In this way, owing to flowing through resistance
Figure DEST_PATH_IMAGE161
by C1, be provided with electric capacity
Figure 493453DEST_PATH_IMAGE110
in electric current.About Fig. 6 b, another is for the compensation slope circuit for generating 100 of buck converter, similar to Fig. 6 a.But the reduction voltage circuit 100 of replacing, explained in equation 4, propose before ignore aspect.Especially, the reduction voltage circuit 100 of replacement comprises error voltage
Figure DEST_PATH_IMAGE164
, wherein
Figure 688811DEST_PATH_IMAGE164
=
Figure DEST_PATH_IMAGE166
.Error voltage source
Figure 804535DEST_PATH_IMAGE164
can be by using the metal-oxide-semiconductor field effect transistor realization of connecting with a forward biased diode.
Fig. 7 has illustrated a reverse DC/DC converter 70, and this circuit has a compensation ramp generator 20 of the present invention.Filter assemblies 16 in backward current 70 comprises a transformer 72.This transformer has the number of turn to be
Figure DEST_PATH_IMAGE168
primary coil and the number of turn be
Figure DEST_PATH_IMAGE169
secondary coil, n= (turn ratio of transformer).In addition, detect resistance
Figure DEST_PATH_IMAGE173
refer to ground, the drain electrode of switch 14 is connected to primary inductance, and the source electrode of switch 14 passes through resistance
Figure 395047DEST_PATH_IMAGE173
be connected to ground.As shown in table 1, the compensation slope circuit for generating 20 in flyback converter, during n>1, A approximates 1/n, and when B approximates 1, n<1, A approximates 1, B and approximates n.Circuit 20 can improve for these preferred parameters.
Fig. 8 has illustrated buck DC/DC converter 80, and this circuit contains compensation ramp generator 20 of the present invention.Step-up/step-down circuit 80 is similar to the traditional decompression converter circuit 10 in Fig. 1, but in step-up/step-down circuit 80, inductance and diode transposition.As shown in table 1, for the slope circuit for generating 20 for buck-boost converter, A approximates 1, B and approximates 1, C and approximate
Figure 436559DEST_PATH_IMAGE138
/ L.For these preferred parameters, slope circuit for generating can improve again.
Fig. 9, has illustrated forward dc/DC converter circuit 90, and this circuit contains compensation ramp generator 20 of the present invention.Forward converter circuit 90 is similar to the circuit of Fig. 7, but the filter assemblies 16 of forward circuit 90 is except transformer 92, further comprises that is denoted as an inductance L of 94, and an extra diode D3.At forward circuit 90, detect resistance
Figure 729000DEST_PATH_IMAGE173
be connected to ground, the drain electrode of mains switch 14 is connected to transformer 92.The source electrode of switch 14 also passes through resistance
Figure 648415DEST_PATH_IMAGE173
be connected to ground.Transformer turn ratio is n=
Figure 405018DEST_PATH_IMAGE169
/
Figure 118896DEST_PATH_IMAGE168
.As shown in table 1, for the compensation slope circuit for generating 20 of forward dc/DC converter, during n>2, A approximates 2/n, and B approximates 1, C and approximates
Figure DEST_PATH_IMAGE175
*
Figure 727994DEST_PATH_IMAGE138
/ L, during n<2, A approximates 1, B and approximates n/2, and C approximates 2*n*
Figure 185520DEST_PATH_IMAGE138
/ L.
Figure 10 has illustrated the circuit diagram of another compensation ramp generator circuit 60, and this circuit has the ramp voltage signal 68 of a multiplier and a fixed elevation.The ramp voltage signal 68 of this fixed elevation is produced by oscillator 18, and this oscillator 18 is present in switching regulator circuit 10 together with accumulation of energy timing element, and this accumulation of energy timing element is an electric capacity in preferred version
Figure DEST_PATH_IMAGE177
.
Multiplier 62 is a difference input multiplier in this preferred version, and it has two difference inputs to (x1, x2) and (y1, y2), output voltage
Figure 796630DEST_PATH_IMAGE112
.Input y1 is equivalent to the ramp voltage signal 65 of this fixed elevation.The gain coefficient D=of multiplier 62 , wherein
Figure DEST_PATH_IMAGE181
it is the gradient of the ramp voltage signal 68 of fixed elevation in accumulation of energy timing element.C is the constant C in formula 5.
First pair of multiplier input (x1, x2) is connected respectively to the first voltage divider and the second voltage divider 64,66.First voltage divider 64 dividing potential drop the first current potentials
Figure 576017DEST_PATH_IMAGE098
, it has the resistance of two series connection, and resistance is respectively (1/A-1) * R and R.The dividing potential drop that A is ordered
Figure 843051DEST_PATH_IMAGE098
with x2, indicate.
The second voltage divider 66, have two resistance (1/B-1) * R and
Figure 838688DEST_PATH_IMAGE144
, for dividing potential drop the second current potential
Figure 569884DEST_PATH_IMAGE097
.Resistance
Figure 828827DEST_PATH_IMAGE142
with
Figure 881359DEST_PATH_IMAGE144
there is substantially equal resistance R ohm.Dividing potential drop on B point
Figure 946267DEST_PATH_IMAGE097
with x1, indicate.
The y1 of the second input centering of multiplier is connected to oscillator 18 and the electric capacity in switching regulator circuit 10
Figure 469652DEST_PATH_IMAGE177
.Just as previously discussed,
Figure 696234DEST_PATH_IMAGE177
produce constant ramp voltage
Figure DEST_PATH_IMAGE182
68.Another y2 of the second input centering of multiplier is connected to a DC reference voltage
Figure DEST_PATH_IMAGE184
, it produces a threshold voltage
Figure DEST_PATH_IMAGE186
.Along with voltage
Figure DEST_PATH_IMAGE188
, instantaneous can being conditioned of beginning on compensation slope.
Figure 685662DEST_PATH_IMAGE184
value be less than or equal substantially the ramp voltage of multiplier output
Figure 226365DEST_PATH_IMAGE110
mean value.
Resistance
Figure 666574DEST_PATH_IMAGE089
be the gain adjusting resistance of multiplier 62, constant C be set to suitable value.Multiplier 62 is got the poor of the difference of (x1, x2) input and (y1, y2) input, and they is multiplied by gain coefficient D, produces a compensation ramp signal
Figure 831101DEST_PATH_IMAGE112
.
Multiplier is only all that timing is just worked at difference input voltage (x1, x2) (y1, y2).Otherwise voltage
Figure 294443DEST_PATH_IMAGE112
be approximately 0.If input is negative to there being a differential voltage in (x1, x2) (y1, y2), so voltage
Figure 701154DEST_PATH_IMAGE112
be about 0.
When duty ratio d≤0.5, just do not need to compensate slope.This means
Figure 261448DEST_PATH_IMAGE188
can be set to threshold voltage
Figure 829833DEST_PATH_IMAGE188
≤ (
Figure DEST_PATH_IMAGE190
-
Figure DEST_PATH_IMAGE192
)/2 or lower.
Figure 686798DEST_PATH_IMAGE190
it is the maximum of this voltage
Figure DEST_PATH_IMAGE194
it is the minimum value of this voltage.
Description of the invention, is recognized that, those people consummate in this technical field can make various improvement, or increase the preferred version of selecting in the present invention, and do not depart from the present invention, do not contribute the spirit and scope to this technical field.Therefore, it is to be understood that, provide the prosecution requirement at this should be considered to extend to the purport of claiming, and all equivalents within the scope of the present invention.

Claims (8)

1. an adaptive equalization ramp generator, is characterized in that: switching regulator is to unadjusted input voltage
Figure 720158DEST_PATH_IMAGE001
sensitivity, and the output voltage regulating is provided , the circuit on the generation compensation slope in switching regulator, has a controlled switch element and detects resistance , this resistance provides a signal, and this signal is proportional to the electric current that flows through switch element, this signal is used for the operation of control switch pressurizer, also have a device that is used for storage power and contains an inductance, compensation ramp circuit comprises: produce the device of compensation ramp voltage, it has a gradient , this gradient is in accordance with following equation ≤ (A*
Figure 806056DEST_PATH_IMAGE005
-B*
Figure 956415DEST_PATH_IMAGE001
) * C, A≤1 wherein, B≤1, C is a constant, depends on
Figure 223448DEST_PATH_IMAGE003
, L and the magnetic coupling parameter relevant with energy storage equipment; With a device, this device is used for detecting the compensation ramp signal that on ohmically signal, stack generates, and relies on this device, can maintain the stability of switching regulator; A, B, C chooses according to the model of following switching regulator:
Switching regulator A B C Voltage-dropping type 1
Figure 484665DEST_PATH_IMAGE006
.5 2
Figure 448817DEST_PATH_IMAGE003
/L Booster type
Figure 707760DEST_PATH_IMAGE007
.5 1 2
Figure 524406DEST_PATH_IMAGE003
/L Buck-boost type 1
Figure 323735DEST_PATH_IMAGE006
1
Figure 909437DEST_PATH_IMAGE003
/L
Switching regulator have an error voltage (
Figure 339281DEST_PATH_IMAGE008
with an associated saturation voltage (
Figure 879109DEST_PATH_IMAGE009
), comprise a diode, it provides a paths, when switch element disconnects, for emitting energy that energy storage device stores to an external loading, wherein diode have an associated forward biased diode voltage (
Figure 482129DEST_PATH_IMAGE010
), error voltage with
Figure 125600DEST_PATH_IMAGE010
with
Figure 523083DEST_PATH_IMAGE009
relevant, compensate like this ramp voltage and be exactly
Figure 314322DEST_PATH_IMAGE004
=(A*
Figure 959848DEST_PATH_IMAGE005
-B*(
Figure 457825DEST_PATH_IMAGE001
-
Figure 26210DEST_PATH_IMAGE011
)) * C; Error voltage
Figure 304744DEST_PATH_IMAGE012
according to the type setting of following switching regulator:
Switching regulator
Figure DEST_PATH_IMAGE013
 Voltage-dropping type ≈【
Figure 249567DEST_PATH_IMAGE010
+
Figure 165832DEST_PATH_IMAGE009
】 Booster type ≈【
Figure 170697DEST_PATH_IMAGE010
+ 】 Buck-boost type ≈【
Figure 91566DEST_PATH_IMAGE010
+
Figure 626452DEST_PATH_IMAGE009
】 Flyback type (n > 1; N < 1) ≈【 /n+
Figure 960405DEST_PATH_IMAGE009
】 Forward type (n > 2; N < 2) ≈【2
Figure 247030DEST_PATH_IMAGE010
/n+
Figure 636423DEST_PATH_IMAGE009
】
Energy storage equipment is a transformer, and it contains a number of turn and is
Figure 983091DEST_PATH_IMAGE014
armature winding and the number of turn be
Figure 959400DEST_PATH_IMAGE015
secondary winding, turn ratio is n, wherein n=
Figure 784136DEST_PATH_IMAGE016
, the inductance coefficent of energy storage equipment is
Figure 28036DEST_PATH_IMAGE017
, A wherein, B, C chooses according to following switching regulator:
。
2. a kind of adaptive equalization ramp generator according to claim 1, is characterized in that: wherein switching regulator is a flyback converter, and n is greater than 1, and A is greater than 1/n like this, and B is less than or equal to 1, C and is more than or equal to R s/ L p; N is less than 1, and A is less than or equal to 1, B and is less than n like this, and C is more than or equal to R s/ (n*L p); Switching regulator is a forward converter, and n is greater than 2, and A is greater than 2/n like this, and B is less than or equal to 1, C and is more than or equal to
Figure DEST_PATH_IMAGE019
/ L; N is greater than 2, and A is less than or equal to 1, B and is less than n/2 like this, and C is more than or equal to
Figure 23858DEST_PATH_IMAGE020
/ L; Switching regulator is buck-boost converter, and A is less than or equal to 1, B and is less than 1, C and is more than or equal to
Figure 652285DEST_PATH_IMAGE021
/ L; Switching regulator is buck converter, and A is less than or equal to 1, B and is less than 0.5, C and is more than or equal to 2*
Figure 688374DEST_PATH_IMAGE021
/ L; Switching regulator is booster converter, and A is less than 0.5, B and is less than or equal to 1, C and is more than or equal to 2* / L.
3. a kind of adaptive equalization ramp generator according to claim 1, is characterized in that: the compensation ramp signal in the switching regulator of the type has a gradient
Figure 826280DEST_PATH_IMAGE022
, switching regulator is to unadjusted input voltage (V iN) responsive and provide an output voltage regulating (
Figure 930503DEST_PATH_IMAGE023
), it have one detect resistance (
Figure 650459DEST_PATH_IMAGE021
), this resistance provides a signal, this signal is proportional to the electric current that flows through controlled switch element, operation for control switch pressurizer, also have an energy storage equipment that contains inductance (L), the method that produces compensation ramp signal comprises step: (A) produce first voltage proportional to output voltage; (B) produce a second voltage proportional to input voltage, wherein the proportionality coefficient of the first voltage and second voltage is chosen according to the type of switching circuit; (C) get the poor of the first voltage and second voltage, and itself and a factor multiplied each other, this factor by
Figure 509831DEST_PATH_IMAGE021
, L and the magnetic coupling parameter decision relevant to energy storage equipment, produce a gradient compensation ramp voltage, and this magnitude of voltage approximates the product of voltage difference and factor; (D) the compensation ramp voltage of generation is added to from detecting on the signal of resistance, this strengthens the stability of switching regulator; Energy storage equipment is a transformer, and it contains a number of turn and is armature winding and the number of turn be
Figure 354476DEST_PATH_IMAGE025
secondary winding, turn ratio is n, wherein n= , the inductance coefficent of energy storage equipment is , switching regulator is a flyback converter, and n is greater than 1, and so the first voltage producing is greater than 1/n, the second voltage that produces in step B and arrange is less than or equal to 1, and step C comprises the step that factor is set, it is more than or equal to
Figure 52414DEST_PATH_IMAGE021
/
Figure 560756DEST_PATH_IMAGE027
; N is less than 1, so the first voltage that produces in steps A and arrange is less than or equal to 1, the second voltage that produces in step B and arrange is less than n, and step C comprises the step that factor is set, and it is more than or equal to
Figure 753840DEST_PATH_IMAGE021
/ (n*
Figure 955014DEST_PATH_IMAGE027
); Energy storage equipment is an inductor that is connected to switch element by transformer, and it contains a number of turn and is
Figure 538442DEST_PATH_IMAGE024
armature winding and the number of turn be secondary winding, turn ratio is n, wherein n=
Figure 399530DEST_PATH_IMAGE026
, switching regulator is a forward converter, and n is greater than 2, and the first voltage that produces in steps A and arrange is greater than 2/n, and the second voltage that produces in step B and arrange is less than or equal to 1, and step C comprises the step that factor is set, and it is more than or equal to *
Figure 842330DEST_PATH_IMAGE021
/ L; N is less than 2, and the first voltage that steps A produces and arranges is less than or equal to 1, and the second voltage that produces in step B and arrange is less than n/2, and step C comprises the step that factor is set, and it is more than or equal to 2*n* / L; Switching regulator is a buck-boost converter, and the first voltage that produces in steps A and arrange is less than or equal to 1, and the second voltage that produces in step B and arrange is less than 1, and step C comprises the step that factor is set, and it is more than or equal to / L.
4. a kind of adaptive equalization ramp generator according to claim 3, is characterized in that: switching regulator have an error voltage ( ) and an associated saturation voltage
Figure 199963DEST_PATH_IMAGE030
, further comprising a diode, it provides a paths, when switch element disconnects, is used for emitting the energy that is stored in energy storage equipment to external loading, and diode wherein has an associated forward biased diode voltage (V d), error voltage with
Figure 119377DEST_PATH_IMAGE031
with
Figure 875981DEST_PATH_IMAGE030
relevant, the step that produces second voltage in step B comprises: from input voltage, deduct error voltage, produce the voltage of a correction, like this, second voltage is just proportional with corrected voltage; The step that produces corrected voltage comprises, according to the type step-up error voltage of following switching regulator:
Switching regulator
Figure 527542DEST_PATH_IMAGE013
 Voltage-dropping type ≈【
Figure 136640DEST_PATH_IMAGE031
+
Figure 594166DEST_PATH_IMAGE030
】 Booster type ≈【
Figure 205276DEST_PATH_IMAGE031
+
Figure 293318DEST_PATH_IMAGE030
】 Buck-boost type ≈【 +
Figure 116841DEST_PATH_IMAGE030
】 Flyback type (n > 1; N < 1) ≈【
Figure 785720DEST_PATH_IMAGE031
/n+
Figure 106979DEST_PATH_IMAGE030
】 Forward type (n > 2; N < 2) ≈【2
Figure 658047DEST_PATH_IMAGE031
/n+ 】
Switching regulator is a booster converter, and the first voltage that produces in steps A and arrange is less than 0.5, and the second voltage that produces in step B and arrange is less than or equal to 1, and step C comprises the step that factor is set, and it is more than or equal to 2*
Figure 246340DEST_PATH_IMAGE021
/ L; Switching regulator is a buck converter, and the first voltage that produces in steps A and arrange is less than or equal to input voltage, and the second voltage that produces in step B and arrange is less than half of output voltage, and step C comprises the step that factor is set, and it is more than or equal to 2*
Figure 974387DEST_PATH_IMAGE021
/ L.
5. a kind of adaptive equalization ramp generator according to claim 1, is characterized in that: in DC to DC converter, for generation of the circuit of compensation ramp signal, DC to DC converter receives an input voltage, and an output voltage is provided; Contain one detect resistance (
Figure 278329DEST_PATH_IMAGE021
), this resistance provides a signal, and this signal is proportional with the electric current that flows through controlled switch element; Also have a device that is used for storage power and contains an inductance (L), circuit wherein comprises: the device to output voltage sensitivity, be used to provide first signal, and this signal and the output voltage numerical value after divided by first preset value equates; Device to input voltage sensitivity, is used to provide secondary signal, and this signal and the input voltage numerical value after divided by the second preset value equates; The device that produces a charging current, the difference of this electric current and first signal and secondary signal is proportional; Device to charging current sensitivity, is used for producing a ramp signal with gradient, and this gradient is chosen according to DC to DC converter; Wherein, the device that produces an electric current comprises: the first transistor, and its base stage is connected to bleeder mechanism, and bleeder mechanism is connected to output voltage, and the emitter of the first transistor is connected to output voltage by the second bleeder mechanism; Transistor seconds, have two collector electrodes at least, its the first collector electrode is connected to its base stage and input voltage by a spreading resistance, its emitter is connected to the emitter of output voltage and the first transistor, another voltage divider is selected, so input voltage does not change, the second collector electrode provides proportional electric current to the device to this electric current sensitivity, is used for producing ramp signal; The collector electrode of the first transistor is biased to the first current potential, and its emitter is biased to the second current potential, and the emitter base node of the first transistor is forward biased like this; Transistor seconds has two collector electrodes at least, wherein the first collector electrode is connected to its base stage and the emitter of the first transistor, the emitter of transistor seconds is connected to the 3rd current potential by a spreading resistance, the second collector electrode provides proportional electric current to the device to this electric current sensitivity, is used for producing ramp signal; The device that produces an electric current comprises: the first transistor, and its base stage is connected to bleeder mechanism, and this bleeder mechanism is connected to input voltage, and the collector electrode of the first transistor is connected to input voltage; Transistor seconds, it at least contains two collector electrodes, the first collector electrode is connected to its base stage and the emitter of the first transistor, the emitter of transistor seconds is connected to another bleeder mechanism, this bleeder mechanism is connected to output voltage by a spreading resistance, and another voltage divider is selected, and output voltage does not change like this, the second collector electrode provides a proportional electric current to the device to this circuit sensitive, is used for producing ramp signal.
6. a kind of adaptive equalization ramp generator according to claim 5, is characterized in that: foregoing circuit, wherein: the emitter of transistor seconds is connected to output voltage by spreading resistance; The device that produces ramp signal comprises a device, and this device has an electric capacity, this electric capacity be L and
Figure 881349DEST_PATH_IMAGE021
function; When this proportional electric current is used to capacitor charging, ramp signal is exactly the voltage that the device two ends of containing electric capacity produce; The device that produces an electric current comprises: the first transistor, its base stage is connected to a bleeder mechanism, its emitter is biased to the first current potential, collector electrode is connected to the second current potential, the emitter base node of the first transistor is exactly forward biased like this, and collector base junction point is back-biased; Transistor seconds has at least two collector electrodes, wherein the first collector electrode is connected to its base stage, its emitter is connected to the emitter of the first transistor, the first collector electrode is connected to another bleeder mechanism by spreading resistance, the second collector electrode provides proportional electric current to the device to this electric current sensitivity, is used for producing ramp signal; Wherein, the first preset value is less than or equal to 1, the second preset value and is also less than or equal to 1; Current device is wherein voltage-controlled current source; Device to electric current sensitivity comprises capacity cell, and capacitance is
Figure 321557DEST_PATH_IMAGE021
function with L.
7. a kind of adaptive equalization ramp generator according to claim 1, is characterized in that: the switching regulator of this type, to unadjusted input voltage (
Figure 922303DEST_PATH_IMAGE032
) responsive and provide regulate output voltage later (
Figure 940638DEST_PATH_IMAGE023
), it have one detect resistance (
Figure 347348DEST_PATH_IMAGE021
), this resistance provides a signal, and this signal is proportional with the electric current flowing through, and this signal is used to the operation of control switch pressurizer, also has an energy storage equipment that contains inductance (L), and design has gradient
Figure 907643DEST_PATH_IMAGE022
the method of compensation ramp signal, comprise step: (A) produce first voltage proportional to output voltage; (B) produce a second voltage proportional to input voltage, wherein the proportionality coefficient of the first voltage and second voltage is chosen according to the type of switching circuit; (C) get the poor of the first voltage and second voltage, and itself and a factor multiplied each other, this factor by , L and the magnetic coupling parameter decision relevant to energy storage equipment, produce a gradient compensation ramp voltage, and this magnitude of voltage approximates the product of voltage difference and factor; (D) the compensation ramp voltage of generation is added to from detecting on the signal of resistance, this strengthens the stability of switching regulator; Energy storage equipment is a transformer, and it contains a number of turn and is
Figure 256027DEST_PATH_IMAGE024
armature winding and the number of turn be secondary winding, turn ratio is n, wherein n= , the inductance coefficent of energy storage equipment is
Figure 292619DEST_PATH_IMAGE027
, switching regulator is a flyback converter, and n is less than 1, and the first voltage that produces in steps A and arrange is less than or equal to 1, and the second voltage that produces in step B and arrange is less than n, and step C comprises the step that factor is set, and its value is more than or equal to
Figure 730553DEST_PATH_IMAGE021
/ (n*
Figure 479067DEST_PATH_IMAGE027
); Energy storage equipment is an inductance, and it is connected to switch element by a transformer, and this transformer has a number of turn to be
Figure 246909DEST_PATH_IMAGE024
armature winding and the number of turn be
Figure 422675DEST_PATH_IMAGE025
secondary winding, turn ratio is n, wherein n=
Figure 347906DEST_PATH_IMAGE026
, switching regulator is a forward converter, and n is less than 2, and the first voltage that produces in steps A and arrange is less than or equal to 1, and the second voltage that produces in step B and arrange is less than n/2, and step C comprises the step that factor is set, and it is more than or equal to 2*n*
Figure 634531DEST_PATH_IMAGE021
/ L; Wherein step B comprises the step that second voltage is set, and this voltage is less than 1, and step C comprises the step that factor is set, and this factor is more than or equal to
Figure 23924DEST_PATH_IMAGE021
/ L; Wherein energy storage equipment is a transformer, and it contains a number of turn and is
Figure 308275DEST_PATH_IMAGE024
armature winding and the number of turn be secondary winding, turn ratio is n, wherein n=
Figure 109320DEST_PATH_IMAGE026
, the inductance coefficent of energy storage equipment is , switching regulator is a flyback converter, and n is greater than 1, and the first voltage that produces in steps A and arrange is greater than 1/n, and the second voltage that produces in step B and arrange is less than or equal to 1, and step C comprises the step that factor is set, and this factor is more than or equal to
Figure 808472DEST_PATH_IMAGE021
/
Figure 770611DEST_PATH_IMAGE027
; Switching regulator is a booster converter, and the first voltage that produces in steps A and arrange is less than 0.5, and the second voltage that produces in step B and arrange is less than or equal to 1, and step C comprises the step that factor is set, and this factor is more than or equal to 2*
Figure 903433DEST_PATH_IMAGE021
/ L; Switching regulator is a buck converter, and the first voltage that produces in steps A and arrange is less than or equal to input voltage, and the second voltage that produces in step B and arrange is less than half of output voltage, and step C comprises the step that factor is set, and this factor at least equals 2* / L.
8. a kind of adaptive equalization ramp generator according to claim 1, it is characterized in that: a circuit produces a compensation ramp voltage in DC to DC converter, this circuit receives the output voltage of an input voltage and a converter, and circuit wherein comprises: the device output voltage divided by the first preset value; Device input voltage divided by the second preset value; Produce the device of an electric current, this electric current is proportional with the difference of removing input voltage afterwards and output voltage; The difference of the input voltage after removing and output voltage is multiplied by the ramp voltage of a fixed elevation, is used for producing compensation ramp signal.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762842A (en) * 2013-11-25 2014-04-30 苏州贝克微电子有限公司 Adaptive compensation ramp generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762842A (en) * 2013-11-25 2014-04-30 苏州贝克微电子有限公司 Adaptive compensation ramp generator

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