CN110034678A - Single inductance double-polarity control type of voltage step-up/down converter and its control method - Google Patents
Single inductance double-polarity control type of voltage step-up/down converter and its control method Download PDFInfo
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- CN110034678A CN110034678A CN201810029733.6A CN201810029733A CN110034678A CN 110034678 A CN110034678 A CN 110034678A CN 201810029733 A CN201810029733 A CN 201810029733A CN 110034678 A CN110034678 A CN 110034678A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Abstract
The invention discloses a kind of control methods, single inductance double-polarity control (SIBO) type of voltage step-up/down converter of control one, the list inductance double-polarity control type of voltage step-up/down converter includes the first switch being coupled between an input and a first node, the second switch being coupled between the first node and ground terminal, the third switch being coupled between a second node and ground terminal, one the 4th switch being coupled between the second node and one first output node for exporting the positive output, one the 5th switch being coupled between the first node and one second output node for exporting the negative output, and be coupled in this first and the second node between an inductance, the control method include: control this first with the third switch conduction, with the inductance that magnetizes；Control this first with the 4th switch conduction, to generate the positive output；And the third and the 5th switch conduction are controlled, to generate the negative output.
Description
Technical field
The invention relates to a kind of single inductance double-polarity control (SIBO, Single Inductor Bipolar
Output) type of voltage step-up/down converter and its control method.
Background technique
Behavioral system and display need effective long-time battery to use.In addition, display quality is important performance feature
One of, even if but in heavy load current variation, the switching noise for rapidly inputting variation in voltage and DC-to-dc converter, it shows
Show that quality cannot be still sacrificed.
Active-matrix OLED (active matrix OLED, AMOLED) is shown in more and more general in action display application
Time, because the advantages of active-matrix OLED, is high display quality, low power consumption and low material cost.Active-matrix
Oled panel usually requires positive polarity with different voltages and negative polarity power supply is supplied.And positive voltage and negative electricity needed for this
The ripple size of voltage source output is necessarily enough small, is just avoided that the generation of water ripples, destroys panel display quality.Different panels
There may be the demand of different output current and voltage, generally depend on panel size, pixel quantity, display quality etc..
Fig. 1 shows existing single inductance AMOLED power supply unit, is two-stage SIBO converter.As shown in Figure 1, existing
Two-stage SIBO converter 100 includes: synchronization lifting volt circuit (synchronous buck-boost circuit) 120, charge
Pump (charge pump) 140, inductance L11 and capacitor C11-C15.Capacitor C11-C13 is decoupling capacitance.Capacitor C14-C15 is
Go at express speed capacitor (fly capacitor).The existing generation of two-stage SIBO converter 100 positive output Vop drives negative with positive current Iop
160 are carried, and generates negative output Von and negative current Ion to drive load 180.Input terminal provides input voltage vin and input current
Iin。
According to the relativeness condition of input voltage vin and output voltage Vop, synchronization lifting volt circuit 120 can be operated
In decompression, buck and boosting isotype.This input voltage vin is usually provided by lithium battery, the voltage model of input voltage vin
It encloses between 3.0V to 4.5V, and the desirable value of output voltage Vop is then about AMOLED panel size, display brightness and driving
The common representative value of chip, output voltage Vop includes 4.6V, 3.3V, 2.8V and 2.5V etc..
Charge pump 140 is to generate negative output Von from positive output Vop.Charge pump 140 can there are many deferent segment (step),
Such as it but is not only restricted to, -1x and -1.5x.Using the capacitor C14 that goes at express speed, charge pump 140 can realize -1x, that is, Von=Vop* (-
1).Using the capacitor C14 and C15 of going at express speed, charge pump 140 can realize -1.5x, that is, Von=Vop* (- 1.5).Negative output Von can
- 1x~-the 1.5x for being positive output Vop by converter digital interface setting, to meet the high brightness demand of displayer.
As seen from Figure 1, the generation of positive output Vop and negative output Von is independent control.
Fig. 2 shows the energy conversion efficiency figure of two-stage SIBO converter 100.Energy conversion efficiency Eff is defined as follows:
As shown in Fig. 2, when Vop be equal to 2.8 (V) when, existing two-stage SIBO converter 100 Von=Vop* (- 1)=
2.8* (- 1)=- 2.8 (V) or Von=Vop* (- 1.5)=2.8* (- 1.5)=- 4.2 (V) has optimum capacity transfer efficiency.
However, the energy conversion efficiency of existing two-stage SIBO converter 100 is bad when Von is not equal to -2.8 (V) or -4.2 (V).
It is then desired to improve the energy conversion efficiency of existing two-stage SIBO converter.
Summary of the invention
According to one embodiment of this case, a kind of control method, single inductance double-polarity control (SIBO) buck of control one are proposed
For converter to generate a positive output and a negative output, which includes a SIBO up-down voltage power grade, should
SIBO up-down voltage power grade include the first switch being coupled between an input and a first node, be coupled in the first node with
A second switch between ground terminal, is coupled in the second node at the third being coupled between a second node and ground terminal switch
With export the positive output one first output node between one the 4th switch, be coupled in the first node and export the negative output
Between one second output node one the 5th switch, and be coupled in this first and the second node between an inductance, the control
Method include: control this first with the third switch conduction and this second, the 4th with the 5th switch close, to magnetize
The inductance magnetizes in an inductance and operates phase；Control this first with the 4th switch conduction and the second, third and this
Five switches are closed, to generate the positive output in a positive output charging operations phase；And it controls the third and is led with the 5th switch
It is logical and this first, this second closed with the 4th switch, to generate the negative output in a negative output charging operations phase.
According to another embodiment of this case, a kind of single inductance double-polarity control (SIBO) type of voltage step-up/down converter is provided, to generate
One positive output and a negative output, the SIBO type of voltage step-up/down converter include: SIBO lifting pressure controller；An and SIBO buck
Power stage, is coupled to SIBO lifting pressure controller, which includes being coupled in an input and a first segment
A first switch between point, is coupled in a second node and connects the second switch being coupled between the first node and ground terminal
Third switch between ground terminal, one the 4th opening of being coupled between the second node and one first output node for exporting the positive output
It closes, one the 5th switch being coupled between the first node and one second output node for exporting the negative output, and is coupled in this
An inductance between first and the second node.The SIBO lifting pressure controller control this first with the third switch conduction, with
And the second, the 4th and the 5th switch is closed, and is magnetized with the inductance that magnetizes in an inductance and is operated phase.The SIBO buck
Controller control this first with the 4th switch conduction and the second, third and the 5th switch closing, to generate this just
It is output in a positive output charging operations phase.SIBO lifting pressure controller controls the third and the 5th switch conduction, and
This first, this second with the 4th switch close, to generate the negative output in a negative output charging operations phase.
More preferably understand to have to above-mentioned and other aspect of the invention, special embodiment below, and cooperates institute's attached drawing
Detailed description are as follows for formula:
Detailed description of the invention
Fig. 1 (prior art) shows existing two-stage SIBO converter.
Fig. 2 (prior art) shows the energy conversion efficiency figure of the existing two-stage SIBO converter of Fig. 1.
Fig. 3 shows the circuit diagram of the SIBO type of voltage step-up/down converter according to one embodiment of this case.
Fig. 4 shows 4 operation phase P1-P4 of the SIBO type of voltage step-up/down converter of Fig. 3.
Fig. 5 shows the timing diagram of multiple signals of the SIBO type of voltage step-up/down converter of Fig. 3.
Fig. 6 shows embodiment of this case figure compared with the energy conversion efficiency of existing two-stage SIBO converter.
Wherein, appended drawing reference:
100 synchronization lifting volt circuit 120 of two-stage SIBO converter
140 inductance L11 of charge pump
Capacitor C11-C15 positive output Vop
Positive current Iop load 160,180
Negative output Von negative current Ion
Input voltage vin input current Iin
300 SIBO of SIBO type of voltage step-up/down converter goes up and down pressure controller 310
SIBO up-down voltage power grade 350
Waveform generator 312 compensates error amplifier 314 and 316
The buffer of adder 318 and 319 320 and 322
Comparator 324,326 and 328 voltage generators 330
332 PWM logic 334 of PSM circuit
Resistance Rs, R1, R2 and R3
Reference voltage Vref, VCL
Feedback signal Vop_FB, Von_FB
Output signal VEAp, VEAn, VEApn, Vsum, Cp, Cn, Cpn
Inductive current IL
Control signal S1, S2, S3, SP and SN
Inductance L31
Switch SW1, SW2, SW3, SWP and SWN
Capacitor C31, C32 and C33 node N1, N2
It loads 360,380 P1-P5 and operates phase
Specific embodiment
The technical terms of this specification are the idioms referring to the art, are added as this specification has part term
To illustrate or define, the explanation or definition of this specification are subject in the explanation of the part term.Each embodiment of this exposure point
It Ju You not one or more technical characteristics.Under the premise of may implement, the art has usually intellectual optionally
Implement all or part of technical characteristic in any embodiment, or selectively by skill all or part of in these embodiments
Art feature is combined.
Fig. 3 shows single inductance double-polarity control (SIBO, Single Inductor according to one embodiment of this case
Bipolar Output) type of voltage step-up/down converter 300 circuit diagram.SIBO type of voltage step-up/down converter 300 includes: the control of SIBO buck
Device (SIBO buck-boost inverting controller) 310 and SIBO up-down voltage power grade (SIBO buck-boost
inverting power stage)350。
It includes: waveform generator 312 that SIBO, which goes up and down pressure controller 310, compensates error amplifier 314 and 316, adder
318 and 319, buffer 320 and 322, comparator 324,326 and 328, voltage generator 330, PSM (mode is omitted in pulse,
Pulse skipping mode) circuit 332 and PWM (pulse width modulation, pulse width modulation) logic 334.
Waveform generator 312 is coupled to adder 318.Waveform generator 312 generate periodic waveform signal, such as but not by
It is limited to, ramp signal (ramp signal).The periodic waveform signal as caused by waveform generator 312 is input to adder
318。
Compensation error amplifier 314 is coupled to bleeder circuit, which includes resistance R1, R2 and R3.Compensate error
Amplifier 314 receives reference voltage Vref and feedback signal Vop_FB, and feedback signal Vop_FB is about positive output Vop.Compensation
Output signal VEAp is input to buffer 320, comparator 324 and PSM circuit 332 by error amplifier 314.Also that is, compensation misses
Output signal VEAp caused by poor amplifier 314 (the alternatively referred to as first compensation error amplifier output signal) is in response to just
Export Vop.
Similarly, compensation error amplifier 316 is coupled to bleeder circuit, which includes resistance R1, R2 and R3.It mends
It repays error amplifier 316 and receives ground terminal and feedback signal Von_FB, feedback signal Von_FB is about negative output Von.Compensation
Output signal VEAn is input to buffer 322, comparator 328 and PSM circuit 332 by error amplifier 316.Also that is, compensation misses
Output signal VEAn caused by poor amplifier 316 (the alternatively referred to as second compensation error amplifier output signal) is in response to negative
Export Von.
Periodic waveform signal caused by waveform generator 312 is added by adder 318 with voltage IL*Rs, wherein IL generation
The inductive current of table inductance L31.The output signal Vsum (that is, summation signals) of adder 318 is exported to comparator 324,326
With 328.
The output signal VEAp and VEAn of the difference buffer compensation error amplifier 314 and 316 of buffer 320 and 322.Buffering
The output of device 320 and 322 is being input to adder 319.
Adder 319 is added the output signal (that is, VEAp and VEAn) of buffer 320 and 322 to obtain output signal
VEApn (that is, third compensation error amplifier output signal), and comparator 326 is input to (also that is, VEApn=VEAp+
VEAn)。
Comparator 324 is to receive the output signal Vsum exported by adder 318 and compensate 314 institute of error amplifier
The output signal VEAp of output.The output signal Cp (also known as the first comparison signal) of comparator 324 is input to PWM logic 334.
When output signal Vsum is greater than or equal to output signal VEAp, output signal Cp is logically high.
Comparator 326 is exported receiving the output signal Vsum exported by adder 318 with adder 319 defeated
Signal VEApn out.The output signal Cpn (also known as third comparison signal) of comparator 326 is input to PWM logic 334.Work as output
When signal Vsum is greater than or equal to output signal VEApn, output signal Cpn is logically high.
Comparator 328 is to receive the output signal Vsum exported by adder 318 and compensate 316 institute of error amplifier
The output signal VEAn of output.The output signal Cn (also known as the second comparison signal) of comparator 328 is input to PWM logic 334.
When output signal Vsum is greater than or equal to output signal VEAn, output signal Cn is logically high.
Voltage generator 330 to generate reference voltage Vref and VCL, respectively output to compensation error amplifier 314 with
PSM circuit 332.
PSM circuit 332 is put to receive the output signal VEAp as caused by compensation error amplifier 314, compensation error
Output signal VEAn caused by big device 316, and the reference voltage VCL as caused by voltage generator 330.PSM circuit 332
Output be input to PWM logic 334.The details of PSM circuit 332 is omitted herein.
According to voltage IL*RS, output signal Cp, Cpn and Cn (respectively as produced by comparator 324,326 and 328), and
The output signal of PSM circuit 332, PWM logic 334 generate control signal S1, S2, S3, SP and SN.The details of PWM logic 334 exists
This is omitted.
Also that is, according to the inductive current of positive output Vop, negative output Von and inductance L31, SIBO goes up and down pressure controller 310 and produces
Raw control signal S1, S2, S3, SP and SN.
SIBO up-down voltage power grade 350 includes inductance L31, switch SW1, SW2, SW3, SWP and SWN and capacitor C31,
C32 and C33.Capacitor C31, C32 and C33 are decoupling capacitances.
Switch SW1 is controlled by control signal S1.Switch SW2 is controlled by control signal S2.Switch SW3 is by control signal
S3 is controlled.Switch SWP is controlled by control signal SP.Switch SWN is controlled by control signal SN.
Switch SW1 is coupled between input voltage vin and node N1.Switch SW2 is coupled in node N1 and ground terminal
Between GROUND.Switch SW3 is coupled between node N2 and ground terminal GROUND.It is defeated that switch SWP is coupled in node N2 and first
Between egress (to export positive output Vop).Switch SWN be coupled in node N1 and the second output node (to export bear it is defeated
Von out) between.Inductance L31 is coupled between node N1 and N2.Capacitor C31 is coupled in input voltage vin and ground terminal GROUND
Between.Capacitor C32 is coupled between positive output Vop and ground terminal GROUND.Capacitor C33 is coupled in negative output Von and ground terminal
Between GROUND.
Positive output Vop is higher than 0V, results from capacitor C32.Positive output Vop can drive load with positive current Iop
360.Negative output Von is lower than 0V, results from capacitor C33.Negative output Von can drive load 380 with negative current Ion.
Fig. 4 shows 4 operation phase P1-P4 of the SIBO type of voltage step-up/down converter 300 of Fig. 3.Fig. 5 shows the SIBO liter of Fig. 3
The timing diagram of multiple signals (IL, VEAp, VEAn, VEApn and Vsum) of buck converter 300.As shown in figure 5, SIBO is gone up and down
The tool of pressure converter 300 is there are two types of operation mode: continuous conduction mode (continuous conduction mode, CCM) with it is non-
Continuous conduction mode (discontinuous conduction mode, DCM).
In ccm mode, the inductive current IL of inductance L31 is continuous.Under heavy duty, correct feedback control is utilized
System, SIBO type of voltage step-up/down converter 300 enter CCM mode.
On the contrary, using correct feedback control, SIBO type of voltage step-up/down converter 300 enters DCM mode under light load.
Under light load, the average current of inductive current IL is smaller, thereby increases and it is possible to be discharged to 0.When the average current of inductive current IL is close to 0
When, switch SW1, SWP and SWN will be closed, however, this five switches SW1, SW2, SW3, SWP and SWN can be conducting or pass
It closes, moreover, inductance L31 does not absorb energy yet non-released energy, until next clock cycle.This can be by by inductance L31's
One or both ends suspension joint and reach, or the both ends of inductance L31 are electrically short-circuited to each other and are reached.For example, switch SW2, SW3, SWP with
SWN can be closed, and switch SW1 can be connected.Alternatively, switch SW1, SWP and SWN can be closed, and switch SW2 and SW3 can be connected.
Please refer to Fig. 4 and Fig. 5.At the first operation phase P1, switch SW1 is connected with SW3 and switch SW2, SWP and SWN
Then for close, be denoted as in Fig. 4 " P1,13 "." P1,13 " represent, and at the first operation phase P1, switch SW1 and SW3 is led
It is logical.Thus, at the first operation phase P1, inductive current IL passes through inductance L31 and switch SW1, SW3 from input voltage vin
It is flow to ground terminal GROUND, to charge to inductance L31.Therefore, the first operation phase P1 is induction charging operation phase.Inductance fills
The empty accounting (duty cycle) of electrically operated phase (that is, P1) can be controlled in response to feedback signal Von_FB.
At the second operation phase P2, switch SW1 is connected with SWP, and switch SW2, SW3 and SWN are then closing, in Fig. 4
In be denoted as " P2,1P "." P2,1P " are represented, and at the second operation phase P2, switch SW1 is connected with SWP.Thus, in the second behaviour
Make under phase P2, inductive current flows out from inductance L31 and flow to ground terminal GROUND by switch SP and capacitor C32.Inductance
L31 is magnetized, if input voltage vin is higher than output voltage Vop, and inductance L31 releases energy, if input voltage vin is low
In output voltage Vop.Therefore, it charges to capacitor C32, and positive output Vop is resulted from capacitor C32.Therefore, when the second operation
Phase P1 is positive output charging (positive output energizing) operation phase.Positive output charging operations phase (that is,
P2 empty accounting) can be controlled in response to feedback signal Vop_FB and Von_FB.
In the case where third operates phase P3, switch SW2 is connected with SWP, and switch SW1, SW3 and SWN are then closing, in Fig. 4
In be denoted as " P3,2P "." P3,2P " are represented, and in the case where third operates phase P3, switch SW2 is connected with SWP.Thus, third operation
Phase P3 is that inductance releases energy and operates phase, and inductive current is discharged from electric current L31 to capacitor C32.
At the 4th operation phase P4, switch SW3 is connected with SWN and switch SW1, SW2 and SWP are then closing, in Fig. 4
It is denoted as " P4,3N "." P4,3N " are represented, and at the 4th operation phase P4, switch SW3 and SWN are conducting.Thus, in the 4th behaviour
Make under phase P4, inductance L31 discharges the electric energy of institute's energy storage, and inductive current IL passes through switch SN and capacitor C33 from inductance L31
It flow to ground terminal GROUND.Therefore, it charges to capacitor C33, and negative output Von is resulted from capacitor C33.4th operation phase
P4 is negative output charging (negative output energizing) operation phase.
Under the 5th operation phase P5 (Fig. 4 is not shown), at least one end of inductance L31 is the two of suspension joint or inductance L31
End is electrically short-circuited to each other.For example, switch SW1, SWN and SWP are to close, and switch SW2 and SW3 can be on and off.5th behaviour
Making phase P5 is 0 inductor current operation phase.At the 5th operation phase P5, at least one end of inductance L31 is suspension joint, because
And inductance is not electrically charged and is not discharged yet.
Fig. 5 also shows that 5 kinds of operation modes, also that is, operation mode at Vin > Vop and heavy duty (CCM), in Vin
Operation mode under ≈ Vop and heavy duty (CCM), the operation mode at Vin<Vop and heavy duty (CCM), in Vin>Vop and
Operation mode under light load (DCM), and the operation mode at Vin < Vop and light load (DCM).
As shown in figure 5, the operation mode at Vin > Vop and heavy duty (CCM), under the first operation phase P1, switch
SW1 and SW3 is conducting, thus inductive current IL rises.At the second operation phase P2, switch SW1 and SWP are conducting, inductance
Electric current IL rises, moreover, positive output Vop is resulted from capacitor C32.At the 4th operation phase P4, switch SW3 and SWN is led
It is logical, therefore inductive current IL declines.At the 4th operation phase P4, negative output Von is resulted from capacitor C33.
Similarly, the operation mode at Vin ≈ Vop and heavy duty (CCM), under the first operation phase P1, switch SW1
It is conducting with SW3, thus inductive current IL rises.At the second operation phase P2, switch SW1 and SWP are conducting, but inductance is electric
It flows IL to maintain an equal level, moreover, positive output Vop is resulted from capacitor C32.At the 4th operation phase P4, switch SW3 is connected with SWN,
Therefore inductive current IL decline.At the 4th operation phase P4, negative output Von is resulted from capacitor C33.
Similarly, the operation mode at Vin < Vop and heavy duty (CCM), under the first operation phase P1, switch SW1
It is conducting with SW3, thus inductive current IL rises.At the second operation phase P2, switch SW1 and SWP are conducting, but inductance is electric
IL decline is flowed, moreover, positive output Vop is resulted from capacitor C32.At the 4th operation phase P4, switch SW3 is connected with SWN,
Therefore inductive current IL decline.At the 4th operation phase P4, negative output Von is resulted from capacitor C33.
Operation phase P1, P2 and P4 under the operation mode under Vin > Vop and light load (DCM) are similar to Vin > Vop
And operation phase P1, P2 and P4 under the operation mode under heavy duty (CCM).However, after the 4th operation phase P4, inductance
Electric current IL is close to 0.At the 5th operation phase P5, do not magnetize to inductance L31, this can be floated by by least one end of inductance L31
It connects and reaches, or the both ends of inductance L31 are electrically short-circuited to each other and are reached.
Operation phase P1, P2 and P4 under the operation mode under Vin < Vop and light load (DCM) are similar to Vin < Vop
And operation phase P1, P2 and P4 under the operation mode under heavy duty (CCM).However, after the 4th operation phase P4, inductance
Electric current IL is close to 0.At the 5th operation phase P5, do not magnetize to inductance L31, this can be floated by by least one end of inductance L31
It connects and reaches, or the both ends of inductance L31 are electrically short-circuited to each other and are reached.
Thus, in embodiment of this case, by response to two feedback signals (Vop_FB and Von_FB) and inductance electricity
IL is flowed, to control all switch SW1, SW2, SW3, SWP and SWN.
At heavy duty (CCM), control sequence is P1, P2 and P4, wherein the first operation phase P1 starts from each clock pulse week
The beginning of phase, and end at the rising edge of signal Cp (also that is, Vsum is close to VEAp)；Second operation phase P2 starts from first
The end of phase P1 is operated, and ends at the rising edge of signal Cn (also that is, Vsum is close to VEAn)；And when the 4th operation
Phase P4 starts from the end of the second operation phase P2, and ends at the beginning of subsequent clock cycle.
Under gently load (DCM), control sequence is P1, P2, P4 and P5, wherein when the first operation phase P1 starts from each
The beginning in arteries and veins period, and end at the rising edge of signal Cn (also that is, Vsum is close to VEAn)；Second operation phase P2 starts from
The end of first operation phase P1, and end at the rising edge of signal Cpn (also that is, Vsum is close to VEApn)；When the 4th operation
Phase P4 starts from the end of the second operation phase P2, and ends at inductive current IL and be discharged to close to 0；And when the 5th operation
Phase P5 starts from the end of the 4th operation phase P4, and ends at the beginning of subsequent clock cycle.
Now will explanation, input voltage vin example as provided by lithium battery, wherein the initial voltage of input voltage vin is
4.2V, and required positive output Vop is 3.6V.When beginning, input voltage vin is higher than positive output Vop, embodiment of this case
SIBO type of voltage step-up/down converter 300 operates under Vin > Vop and the operation mode of heavy duty (CCM).Then, because lithium electric current provides
Electric power is gradually lower to SIBO type of voltage step-up/down converter 300, input voltage vin (being exported by lithium battery).When input voltage vin by
Gradual change down to almost close to positive output Vop when, the SIBO type of voltage step-up/down converter 300 of embodiment of this case operates in Vin ≈ Vop and again
Under the operation mode for loading (CCM).When input voltage vin is more gradually lower and is lower than positive output Vop, embodiment of this case
SIBO type of voltage step-up/down converter 300 operates under Vin < Vop and the operation mode of heavy duty (CCM).
In short, in the SIBO type of voltage step-up/down converter 300 of embodiment of this case, by an inductance, multiple capacitors with it is multiple
Switch can produce two output voltages (positive output Vop and negative output Von).
Fig. 6 shows embodiment of this case figure compared with the energy conversion efficiency of existing two-stage SIBO converter, this figure is with Vop=
For 2.8V.As shown in fig. 6, the SIBO type of voltage step-up/down converter of embodiment of this case has smooth and high-energy conversion efficiency (almost
Between 85%-88%).Compared to existing two-stage SIBO converter 100 energy conversion efficiency (between 55%-88% it
Between), the SIBO type of voltage step-up/down converter energy conversion efficiency of embodiment of this case obtains significant improvement.
In conclusion although the present invention has been disclosed by way of example above, it is not intended to limit the present invention..Institute of the present invention
Belong in technical field and have usually intellectual, without departing from the spirit and scope of the present invention, when various change and profit can be made
Decorations.Therefore, protection scope of the present invention should be defined by the scope of the appended claims.
Claims (14)
1. a kind of control method, which is characterized in that the single inductance double-polarity control SIBO type of voltage step-up/down converter of control one is to generate one
Positive output and a negative output, the SIBO type of voltage step-up/down converter include a SIBO up-down voltage power grade, the SIBO up-down voltage power grade
Including be coupled between an input and a first node a first switch, be coupled between the first node and ground terminal one second
The third switch, being coupled between a second node and ground terminal switchs, is coupled in the second node and exports the positive output
One the 4th switch between one first output node, is coupled between the first node and one second output node for exporting the negative output
One the 5th switch, and be coupled in this first and the second node between an inductance, which includes:
Control this first with the third switch conduction and this second, the 4th with the 5th switch close, with the inductance that magnetizes
It magnetizes in an inductance and operates phase；
Control this first with the 4th switch conduction and the second, third and the 5th switch closing, it is just defeated to generate this
For a positive output charging operations phase；And
Control the third and the 5th switch conduction and this first, this second closed with the 4th switch, with generate this bear it is defeated
For a negative output charging operations phase.
2. control method as described in claim 1, which is characterized in that further include:
When the inductive current is close to 0, those five switches of the SIBO up-down voltage power grade are controlled, are not also discharged with not charging
The inductance operates phase in a zero inductor current.
3. control method as claimed in claim 2, which is characterized in that further include:
One first feedback signal is generated, the positive output voltage of the SIBO type of voltage step-up/down converter is proportional to；
One second feedback signal is generated, the negative output voltage of the SIBO type of voltage step-up/down converter is proportional to；
The inductance is controlled according to second feedback signal magnetize operate a duty ratio of phase；And
According to this first with second feedback signal and control a duty ratio of the positive output charging operations phase.
4. control method as claimed in claim 3, which is characterized in that further include:
It generates and compensates error amplifier output signal in response to the one first of first feedback signal；
It generates and compensates error amplifier output signal in response to the one second of second feedback signal；And
Be added this first with this second compensation error amplifier output signal, with generate a third compensation error amplifier output letter
Number.
5. control method as claimed in claim 4, which is characterized in that further include:
Generate a periodic waveform signal；And
It is added a voltage of the periodic waveform signal with the inductive current for being relevant to the inductance, to generate a summation signals.
6. control method as claimed in claim 5, which is characterized in that further include:
The first compensation error amplifier output signal and the summation signals are compared to generate one first comparison signal；
The second compensation error amplifier output signal and the summation signals are compared to generate one second comparison signal；And
Third compensation error amplifier output signal and the summation signals are compared to generate a third comparison signal.
7. control method as claimed in claim 6, which is characterized in that further include:
Receive this first with the second compensation error amplifier output signal and one second reference voltage, to generate multiple arteries and veins
Mode output signal is omitted in punching；And
According to this first, this second omit mode output signal with the third comparison signal and those pulses, generate one the
One, one second, a third, one the 4th and one the 5th control signal to control first, second, the third, the 4th respectively
With the 5th switch.
8. a kind of list inductance double-polarity control SIBO type of voltage step-up/down converter, which is characterized in that negative defeated with one positive output of generation and one
Out, which includes:
One SIBO goes up and down pressure controller；And
One SIBO up-down voltage power grade, is coupled to SIBO lifting pressure controller, which includes being coupled in
One input between a first node a first switch, be coupled in the first node between ground terminal a second switch, couple
A third between a second node and ground terminal switchs, is coupled in the second node and exports one first output of the positive output
One the 4th switch between node, one the 5th be coupled between the first node and one second output node for exporting the negative output open
Close, and be coupled in this first and the second node between an inductance,
Wherein,
SIBO lifting pressure controller control this first with the third switch conduction and this second, the 4th opened with the 5th
It closes, is magnetized with the inductance that magnetizes in an inductance and operate phase；
SIBO lifting pressure controller controls this and first opens with the 4th switch conduction and the second, third and the 5th
It closes, to generate the positive output in a positive output charging operations phase；And
SIBO lifting pressure controller control the third and the 5th switch conduction and this first, this second opens with the 4th
It closes, to generate the negative output in a negative output charging operations phase.
9. SIBO type of voltage step-up/down converter as claimed in claim 8, which is characterized in that when the inductive current is close to 0, the SIBO
Lifting pressure controller controls those five switches of the SIBO up-down voltage power grade, does not also discharge the inductance in 1 not charge
Inductor current operation phase.
10. SIBO type of voltage step-up/down converter as claimed in claim 9, which is characterized in that the SIBO buck controller bay is constituted:
One first feedback signal is generated, the positive output voltage of the SIBO type of voltage step-up/down converter is proportional to；
One second feedback signal is generated, the negative output voltage of the SIBO type of voltage step-up/down converter is proportional to；
The inductance is controlled according to second feedback signal magnetize operate a duty ratio of phase；And
According to this first with second feedback signal and control a duty ratio of the positive output charging operations phase.
11. SIBO type of voltage step-up/down converter as claimed in claim 10, which is characterized in that the SIBO goes up and down pressure controller and includes:
One first compensation error amplifier generates the one first compensation error amplifier output letter in response to first feedback signal
Number；
One second compensation error amplifier generates the one second compensation error amplifier output letter in response to second feedback signal
Number；And
One first adder, be added this first with this second compensation error amplifier output signal, with generate a third compensation miss
Poor amplifier output signal.
12. SIBO type of voltage step-up/down converter as claimed in claim 11, which is characterized in that the SIBO goes up and down pressure controller and includes:
One waveform generator generates a periodic waveform signal；And
One second adder is added a voltage of the periodic waveform signal with the inductive current for being relevant to the inductance, to generate
One summation signals.
13. SIBO type of voltage step-up/down converter as claimed in claim 12, which is characterized in that the SIBO goes up and down pressure controller and includes:
One first comparator compares the first compensation error amplifier output signal compared with the summation signals are to generate one first
Signal；
One second comparator compares the second compensation error amplifier output signal compared with the summation signals are to generate one second
Signal；And
One third comparator compares third compensation error amplifier output signal compared with the summation signals are to generate a third
Signal.
14. SIBO type of voltage step-up/down converter as claimed in claim 13, which is characterized in that the SIBO goes up and down pressure controller and includes:
One pulse omit mode circuit, receive this first with this second compensation error amplifier output signal and one second ginseng
Voltage is examined to generate multiple pulses and omit mode output signal；And
One pulse width modulation logic, according to this first, this second omit mode with the third comparison signal and those pulses
Output signal, generate one first, one second, a third, one the 4th with one the 5th control signal with control respectively this first, this
Two, the third, the 4th switch with the 5th.
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| CN201810029733.6A CN110034678A (en) | 2018-01-12 | 2018-01-12 | Single inductance double-polarity control type of voltage step-up/down converter and its control method |
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| CN201810029733.6A CN110034678A (en) | 2018-01-12 | 2018-01-12 | Single inductance double-polarity control type of voltage step-up/down converter and its control method |
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Application publication date: 20190719 |