CN103312152B - Switch type converter and corresponding control methods - Google Patents
Switch type converter and corresponding control methods Download PDFInfo
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Abstract
The invention discloses a kind of switch type converter, comprise input, N number of output, inductance, charge/discharge control unit, energy distribution control unit and logic control element.Input is used for receiving input voltage signal.N number of output is used for exporting N number of output voltage signal.Inductance is used for storing the energy of input voltage.Charge/discharge control unit and energy distribution control unit produce charge/discharge control signal and N number of energy distribution control signal, to control the keying of charge switch and N number of output switch according to N number of output voltage signal respectively.Wherein, i-th energy distribution control signal is relevant to i-th to N number of output voltage signal, 1≤i≤N.Logic control element, according to N number of charge/discharge control signal and energy distribution control signal, produces charge switch control signal and N number of output switch control signal.
Description
Technical field
The present invention relates to a kind of switch type converter and corresponding control methods, particularly relate to a kind of gross energy can monitoring inductance in real time and the switch type converter and the corresponding control methods that flexibly carry out energy distribution.
Background technology
DC-DC converter (DC/DC Converter) is mainly used to regulation voltage level (boosting or step-down), and makes it be stabilized in set voltage value, to provide the operating voltage needed for electronic installation.Wherein, single inductance multi output (Single Inductor Multiple Output, SIMO) switch type converter can provide by the structure of single inductance the output voltage that many groups are different, therefore, be applicable to very much being applied in movable electronic device or system single chip (System on Chip).Please refer to Fig. 1, Fig. 1 is the schematic diagram of a known single inductance multi output switch type converter 10.As shown in Figure 1, inductance 100 can receive an input voltage signal VI to draw energy via an input IN.The keying of charge switch SW0 and output switch SW1 ~ SW4 is controlled by control circuit 102, the energy that inductance 100 can be drawn into is stored to output capacitance CO1 ~ CO4 respectively, to provide output voltage signal VO_1 ~ VO_4 to load Load1 ~ Load4 via output OUT1 ~ OUT4.Namely single inductance multi output switch type converter 10 can provide output voltage signal VO_1 ~ VO_4 to load Load1 ~ Load4 respectively.In brief, single inductance multi output switch type converter 10 can draw energy from single voltage source, and is carried out by energy point being equipped with exporting and organize output voltage signal more.
The running kenel of single inductance multi output switch type converter 10 mainly can be divided into charge/discharge mode and energy distribution pattern.Wherein, charge/discharge mode is the charge or discharge operation representing inductance 100.The energy that energy distribution modal representation draws for inductance 100 carries out energy distribution running.When charge/discharge mode, inductance 100 can carry out the operation of charge or discharge, and the inductive current of inductance 100 also can rise thereupon or decline simultaneously.When energy distribution pattern, various energy distribution runnings can be carried out according to the demand of application.For example, when being applied in high-fall die mould (all buck), energy distribution just can be gone out when inductance 100 charges by single inductance multi output switch type converter 10 simultaneously.Or when being applied in height-rise die mould (all boost), single inductance multi output switch type converter 10 can first charge after a period of time, and began energy distribution to go out when discharge mode.
Due to charge/discharge mode or energy distribution pattern, all need the control by control circuit 102, decide the keying of charge switch SW0 and output switch SW1 ~ SW4, with by inductance 100 be drawn into Energy transmission to each load.In general, control circuit 102 under fixing frequency of operation, can decide the state of each switch by different modulation modes.For example, common FREQUENCY CONTROL technology of determining comprises bang-bang type control (or claiming sluggish type (Hysteresis) to control) and pulse wave width modulation (Pulse Width Modulation, PWM) control technology.Please refer to Fig. 2, Fig. 2 is the schematic diagram of single inductance multi output switch type converter 20 of known use bang-bang type control technology.With Fig. 1, there is unlike, single inductance multi output switch type converter 20 control circuit 202 adopting bang-bang type control technology.Control circuit 202 comprises voltage ratio device (voltage scaler) VS1 ~ VS4, comparator COM1 ~ COM4 and logic control element 204.Voltage ratio device VS1 ~ VS4 is coupled to output OUT1 ~ OUT4, to receive output voltage signal VO_1 ~ VO_4.As shown in Figure 2, the signal that comparator COM1 foundation voltage ratio device VS1 exports and a reference voltage signal Vref, produce a comparison signal SP_1 to logic control element 204, in like manner, comparator COM2 ~ COM4 also the signal that exports of comparative voltage proportioner VS2 ~ VS4 and reference voltage signal Vref respectively, to produce comparison signal SP_2 ~ SP_4 to logic control element 204.Logic control element 204, according to comparison signal SP_1 ~ SP_4, produces the keying that charge switch control signal SC_0 and output switch control signal SC_1 ~ SC_4 controls charge switch SW0 and output switch SW1 ~ SW4.That is, the sequential by controlling charge switch SW0 and output switch SW1 ~ SW4 can determine single charge/discharge of inductance multi output switch type converter 20 and the running of energy distribution.Specifically, control circuit 202 utilizes comparator COM1 ~ COM4 andlogic control unit 204 to judge gross energy on current inductance 100 whether too high or too low (when charge/discharge mode), and by energy distribution to output OUT1 ~ OUT4, to provide output voltage signal VO_1 ~ VO_4 (when energy distribution pattern).Because comparator can be considered the amplifier that a gain is very large, so when load Load1 ~ Load4 has load variations in various degree, the state all may ordering about comparator COM1 ~ COM4 rapidly produces and changes, thus, the control circuit 202 of bang-bang type control technology is adopted will to reflect load condition rapidly.But, after control circuit 202 reflects load condition rapidly, but often can bring the problem such as current ripple is excessive of misoperation, output stage voltage ripple and inductance 100.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of single inductance multi output switch type converter 30 of known use pulse wave width modulation control technology.With Fig. 2 unlike, control circuit 302 arranges an error amplifier EA, pulse wave width modulation device 304 and an electric capacity C, with detect last group output voltage signal assigned by energy, decide the gross energy needed for inductance 100 in charge/discharge mode.The error voltage signal Ve that pulse wave width modulation device 304 exports according to an error amplifier EA and inductive drop signal Vsen, produces a comparison signal SP_5 to logic control element 204.Please refer to Fig. 4, Fig. 4 is the schematic diagram of the pulse wave width modulation device 304 of Fig. 3.Pulse wave width modulation device 304 comprises a comparator COM and an adder 402.One inductive drop signal Vsen is added with a triangular signal Va by adder 402, to produce a ramp signal Vramp.Comparator COM relative error voltage signal Ve and ramp signal Vramp, and produce comparison signal SP_5 according to this.The flywheel switch SW_F being wherein coupled to inductance 100 two ends is used to the continuous conduction mode controlling single inductance multi output switch type converter 50.Please continue to refer to Fig. 3 and Fig. 4, when the energy that output voltage signal VO_4 obtains is on the low side, the error voltage signal Ve that error amplifier institute EA exports will be lifted, thus, the work period (duty ratio) of the comparison signal SP_5 exported by comparator 402 also can become large thereupon.In the case, logic control element 204 can produce relevant control signal according to this, makes inductance 100 draw more energy to produce relevant output voltage signal, and then reaches the effect of voltage stabilizing.That is, in control circuit 302, can the priority of output voltage signal VO_4 be set to minimum, when its energy shortage, then provide corresponding comparison signal SP_5 to logic control element 204 by pulse wave width modulation device 304.Logic control element 204 extends the ON time of corresponding switch according to this, allows the time lengthening that inductance 100 charges, to reach the object controlling charge/discharge mode.
Single inductance multi output switch type converter 30 of Fig. 3 is bang-bang type control technology under energy distribution pattern, and is the gross energy that employing pulse wave width modulation control technology decides in charge/discharge mode needed for inductance 100 in charge/discharge mode.But, because charge/discharge mode determines that (i.e. output voltage signal VO_4) determined by last group energy that priority is minimum, and the minimum output voltage signal VO_4 of priority also can only be assigned to remaining energy, therefore also the output stage that priority is higher cannot be given above, so the inductive current reaction time will be slower current situation real time reaction.
On the other hand, please refer to Fig. 5, Fig. 5 is the schematic diagram of single inductance multi output switch type converter 50 of another use pulse wave width modulation control technology known.With Fig. 3 unlike, each outgoing route connects and adopts pulse wave width modulation control technology, that is, single inductance multi output switch type converter 50 is all adopt pulse wave width modulation control technology under charge/discharge mode and energy distribution pattern.Control circuit 502 comprises step-up error amplifier EA_1 ~ EA_4, electric capacity C1 ~ C4, interrupteur SW _ P1 ~ SW_P4, phase controller 504 and pulse wave width modulation device 506.Single inductance multi output switch type converter 50 realizes the control of time multitask by phase controller 504 control switch SW_P1 ~ SW_P4, control and energy distribution to reach charge/discharge.But, owing to have employed the mode of time multitask, if organize output voltage, then in one-period, just has repeatedly charge/discharge pattern more, in the case, the switching times of switch will increase and cause handoff loss (switching loss) to rise.In addition, all adopt single inductance multi output switch type converter 50 of pulse wave width modulation control technology also can the elasticity that expands of the maximum frequency of operation of limiting circuit and framework.
In brief, provide the switch type converter of the output voltage that many groups are different for the structure by single inductance, how can grasp induction charging opportunity more in real time and the running of more motor-driven energy distribution, be the problem needing solution at present badly.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of switch type converter and corresponding control methods.
According to embodiments of the invention, it discloses a kind of switch type converter, comprises an input, is used for reception one input voltage signal; N number of output, is used for exporting N number of output voltage signal, and wherein, N is a positive integer; One inductance, is coupled to this input, is used for storing the energy of this input voltage; One charge switch, is coupled to this inductance, is used for, according to a charge switch control signal, controlling the charge path of this inductance; N number of output switch, is coupled to this inductance, is used for according to N number of output switch control signal, controls the signal transmission path between this inductance and this N number of output; One charge/discharge control unit, is coupled to this N number of output, is used for, according to an inductor current signal and this N number of output voltage signal, producing a charge/discharge control signal; One energy distribution control unit, be coupled to this N number of output, be used for according to this N number of output voltage signal, produce N number of energy distribution control signal, wherein, one i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal, and wherein 1≤i≤N, i and N is a positive integer; And a logic control element, be used for according to this charge/discharge control signal and this N number of energy distribution control signal, produce this charge switch control signal to control the keying of this charge switch, and produce this N number of output switch control signal to control the keying of this N number of output switch, and then make the energy storage of this input voltage to this inductance and make the energy distribution stored by this inductance to this N number of output.
According to embodiments of the invention, it also discloses a kind of control method, comprise and a switch type converter is provided, this switch type converter comprises an input, N number of output, one inductance, one charge switch and N number of output switch, this input is used for reception one input voltage signal, this N number of output is used for exporting N number of output voltage signal, wherein, N is a positive integer, this inductance is coupled to this input and is used for storing the energy of this input voltage, this charge switch is coupled to this inductance and is used for controlling according to a charge switch control signal charge path of this inductance, this N number of output switch is coupled to this inductance and is used for the signal transmission path controlling between this inductance and this N number of output according to N number of output switch control signal, according to an inductive drop signal and this N number of output voltage signal, produce a charge/discharge control signal, according to this N number of output voltage signal, produce N number of energy distribution control signal, wherein, one i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal, and wherein 1≤i≤N, i is a positive integer, and according to this charge/discharge control signal and this N number of energy distribution control signal, produce this charge switch control signal to control the keying of this charge switch, and produce this N number of output switch control signal to control the keying of this N number of output switch, and then make the energy storage of this input voltage to this inductance and make the energy distribution stored by this inductance to this N number of output.
Coordinate detailed description and claims of following accompanying drawing, embodiment at this, by address after other object of the present invention and advantage be described in detail in.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a known single inductance multiple output DC transducer.
Fig. 2 is the schematic diagram of single inductance multi output switch type converter of known use bang-bang type control technology.
Fig. 3 is the schematic diagram of single inductance multi output switch type converter of known use pulse wave width modulation control technology.
Fig. 4 is the schematic diagram of the pulse wave width modulation device of Fig. 3.
Fig. 5 is the schematic diagram that known another kind uses single inductance multi output switch type converter of pulse wave width modulation control technology.
Fig. 6 is the schematic diagram of the embodiment of the present invention one switch type converter.
Fig. 7 is the charge/discharge control unit of Fig. 6 and the schematic diagram of energy distribution control unit.
Fig. 8 is the schematic diagram of the slope adjustment pulse wave width modulation device of Fig. 7.
Fig. 9 is the coherent signal waveform schematic diagram that the pulse wave width modulation device of Fig. 4 and the slope of Fig. 8 adjust pulse wave width modulation device.
Figure 10 is the charge/discharge control unit of Fig. 7 and another schematic diagram of energy distribution control unit.
Figure 11 is the schematic diagram of a flow process of the embodiment of the present invention.
Wherein, description of reference numerals is as follows:
10,20,30,50 multi output switch type converters
100,600 inductance
102,202,302,502 control circuits
204,606 logic control elements
304,506,702 pulse wave width modulation devices
402 adders
504 phase controllers
60 switch type converters
602 charge/discharge control units
604 energy distribution control units
606 logic control elements
802 DC current source
110 flow processs
1100 ~ 1108 steps
C, C1 ~ C4, CR (i), Csum electric capacity
CO1 ~ CO4 output capacitance
COM, COM1 ~ COM4, COM (i) comparator
EA, E_1 ~ EA_8, EA (i+1) ~ EA (N) error amplifier
I electric current
IN input
Load1 ~ Load4 load
OUT1 ~ OUT4 output
RA_1 ~ RA_4, RA_ (i) slope adjustment pulse wave width modulation device
SC_0 charge switch control signal
SC_1 ~ SC_4 output switch control signal
SC_5 flywheel switch control signal
SD_0 charge/discharge control signal
SD_1 ~ SD_4 energy distribution control signal
SP_1 ~ SP_5 comparison signal
SW0 charge switch
SW1 ~ SW4 output switch
SW_F flywheel switch
SW_P1 ~ SW_P4 switch
SW_R Resetting Switching
Ve, Ve_1 ~ Ve_4, Ve2_1 ~ Ve2_4, error voltage signal
Ve3_(i+1)～Ve3_(N)
VI input voltage signal
VO_1 ~ VO_4, VO_ (i+1) ~ VO_ (N) output voltage signal
Va triangular signal
Vramp, Vra (i) ramp signal
Vref, Vref_1, Vref_2 reference voltage signal
VS1 ~ VS8 voltage ratio device
VS_1 ~ VS_4 proportional voltage signal
Vsen inductive drop signal
Vsum sum voltage signal
Embodiment
Please refer to reference to figure 6, Fig. 6 is the schematic diagram of the embodiment of the present invention one switch type converter 60.Switch type converter 60 comprises an input IN, an inductance 600, output OUT1 ~ OUT4, output capacitance CO1 ~ CO4, charge switch SW0, output switch SW1 ~ SW4, charge/discharge control unit 602, energy distribution control unit 604 and a logic control element 606.Input IN is used for reception one input voltage signal VI.Output OUT1 ~ OUT4 is used for exporting output voltage signal VO_1 ~ VO_4.Inductance 600 is coupled to input IN, is used for storing the energy of input voltage VI.Charge switch SW0 is coupled to inductance 600, is used for according to a charge switch control signal SC_0, controls the charge path of inductance 600.Output switch SW1 ~ SW4 is respectively coupled to output OUT1 ~ OUT4 and inductance 600, is used for according to output switch control signal SC_1 ~ SC_4, controls the signal transmission path between inductance 600 and output OUT1 ~ OUT4.Output capacitance CO1 ~ CO4 is used for storing the energy of inductance 600 to provide output voltage signal VO_1 ~ VO_4 to output OUT1 ~ OUT4.
Charge/discharge control unit 602 is coupled to output OUT1 ~ OUT4 (not being illustrated in Fig. 6) andlogic control unit 606, be used for, according to an output voltage signal VO_1 ~ VO_4 and inductive drop signal Vsen, producing a charge/discharge control signal SD_0 to logic control element 606.Energy distribution control unit 604 couples output OUT1 ~ OUT4 (not being illustrated in Fig. 6) andlogic control unit 606, is used for according to output voltage signal VO_1 ~ VO_4, and produce power distributes control signal SD_1 ~ SD_4.Wherein, i-th energy distribution control signal (i.e. energy distribution control signal SD_i) is relevant to output voltage signal (the i.e. output voltage signal VO_i ~ output voltage signal VO_4) VO4 that i-th outputs voltage signal to afterbody, wherein, 1≤i≤4, i is a positive integer.
In brief, by charge/discharge control unit 602, the present invention judges that whether the energy stored by inductance 600 is sufficient, such as judge the size of the summation of all output voltage signals, then produce charge/discharge control signal SD_0 according to this to logic control element 606.On the other hand, the present invention judges the situation of change of correlation output voltage signal by energy distribution control unit 604, and produce power distributes control signal SD_1 ~ SD_4 to logic control element 606 according to this.That is, energy distribution control unit 604 considers the change of the output voltage signal of rear class, produces corresponding energy distribution control signal to logic control element 606.For example, when energy distribution control unit 604 is when considering how the energy distribution on inductance 600 is produced output voltage signal VO_2 to output OUT2 by this, by observing the situation of current output voltage signal VO_3 and VO_4 to produce corresponding energy distribution control signal, and realize flexible energy distribution under energy distribution pattern.Further, logic control element 606 can according to charge/discharge control signal SD_0 and energy distribution control signal SD_1 ~ SD_4, produce charge switch control signal SC_0 to control the keying of charge switch SW0, and produce output switch control signal SC_1 ~ SC_4 to control the keying of output switch SW1 ~ SW4, and then make the energy storage of input voltage VI to inductance 600 and make energy distribution stored by inductance 600 to output OUT1 ~ OUT4.
Please refer to Fig. 7, Fig. 7 is the charge/discharge control unit 602 of Fig. 6 and the schematic diagram of energy distribution control unit 604.As shown in Figure 7, charge/discharge control unit 602 comprises voltage ratio device VS1 ~ VS4, error amplifier EA1 ~ EA4, electric capacity Csum and pulse wave width modulation device 702.Voltage ratio device VS1 ~ VS4 is respectively coupled to output OUT1 ~ OUT4, is used for according to output voltage signal VO_1 ~ VO_4, export ratio voltage signal VS_1 ~ VS_4.Error amplifier EA1 ~ EA4 is respectively coupled to voltage ratio device VS1 ~ VS4, is used for according to a proportional voltage signal VS_1 ~ VS_4 and reference voltage signal Vref_1, produces error voltage signal Ve_1 ~ Ve_4.Electric capacity Csum is coupled to error amplifier EA1 ~ EA4, is used for according to error voltage signal Ve_1 ~ Ve_4, produces a sum voltage signal Vsum.Pulse wave width modulation device 702 is coupled to error amplifier EA1 ~ EA4 and electric capacity Csum, is used for according to sum voltage signal Vsum, produces charge/discharge control signal SD_0.
Specifically, each the voltage ratio device in charge/discharge control unit 602 can be coupled to an output and according to corresponding output voltage signal, export corresponding proportional voltage signal.Then, each error amplifier in charge/discharge control unit 602 can be respectively coupled to one of them of voltage ratio device VS1 ~ VS4, and according to the first corresponding proportional voltage signal and reference voltage signal Vref_1, produce the first corresponding error voltage signal.Error voltage signal Ve_1 ~ Ve_4 that error amplifier EA1 ~ EA4 produces can charge to electric capacity Csum, and therefore electric capacity Csum can produce a sum voltage signal Vsum to pulse wave width modulation device 702.Pulse wave width modulation device 702, again according to sum voltage signal Vsum and inductive drop signal Vsen, produces charge/discharge control signal SD_0.Wherein, inductive drop signal Vsen can be an induced voltage signal of inductance 600.In the case, for each group output voltage signal, the energy assigned by each output can be reflected by each corresponding error amplifier, namely sum voltage signal Vsum is equivalent to the output signal summation of each error amplifier, also represents the gross energy that switch type converter 60 is required under charge/discharge mode simultaneously.Therefore, when charge/discharge control signal SD_0 represents that gross energy is not enough, being namely equivalent to apprizing system needs more energy to supply output voltage signal, to reach the effect of voltage stabilizing.Logic control element 606 will produce charge switch control signal SC_0 to control charge switch SW0, and the energy making the energy of input voltage VI can continue to be stored to inductance 600 to provide to increase inductance 600, vice versa.
In brief, in the control running of charge/discharge control unit 602, the output summation of the error amplifier of each output voltage signal is relevant to by detecting, whether demand is met with the energy of real-time judge charge/discharge mode, single inductance multi output switch type converter 30 compared to Fig. 3 must be waited until that afterbody exports and just can judge, the present invention fast reaction in real time can go out required energy summation, and not enough situation occurs for energy that more energy can be assigned to each output under avoiding energy distribution pattern in time to allow inductance 600 accumulate.
Please continue to refer to Fig. 7, energy distribution control unit 604 comprises voltage ratio device VS5 ~ VS8, error amplifier EA5 ~ EA8, electric capacity C1 ~ C4 and slope adjustment pulse wave width modulation device RA_1 ~ RA_4.As shown in Figure 7, voltage ratio device VS5 ~ VS8 is respectively coupled to output OUT1 ~ OUT4, is used for according to output voltage signal VO_1 ~ VO_4, export ratio voltage signal VS_5 ~ VS_8.Error amplifier EA5 ~ EA8 is respectively coupled to voltage ratio device VS5 ~ VS8, is used for according to a proportional voltage signal VS_5 ~ VS_8 and reference voltage signal Vref_2, produces error voltage signal Ve2_1 ~ Ve2_4.Slope adjustment pulse wave width modulation device RA_1 ~ RA_4 is respectively coupled to error amplifier EA5 ~ EA8, and be used for according to error voltage signal Ve2_1 ~ Ve2_4, produce power distributes control signal SD_1 ~ SD_4.Wherein, i-th energy distribution control signal (i.e. energy distribution control signal SD_i) is relevant to i-th output voltage signal (i.e. output voltage signal VO_i) to output voltage signal VO4, for example, energy distribution control signal SD_2 can be relevant to output voltage signal VO_2, VO_3 and VO4.
Further illustrate, please refer to Fig. 8, Fig. 8 is the schematic diagram of the slope adjustment pulse wave width modulation device RA_1 ~ RA_4 of Fig. 7.As shown in Figure 8, slope adjustment pulse wave width modulation device RA_ (i) represents i-th slope adjustment pulse wave width modulation device, and 1≤i≤N, i is a positive integer.Because switch type converter 60 provides 4 output voltage signals, therefore, now N=4.Slope adjustment pulse wave width modulation device RA_ (i) comprises (N-i) individual error amplifier (i.e. error amplifier EA (i+1) ~ EA (N)), electric capacity CR (i), comparator COM (i).Error amplifier EA (i+1) ~ EA (N) is respectively coupled to output OUT (i+1) ~ OUT (N), be used for according to output voltage signal VO_ (i+1) ~ VO_ (N), produce error voltage signal Ve3_ (i+1) ~ Ve3_ (N).Error voltage signal Ve3_ (i+1) ~ Ve3_ (N) can charge to electric capacity CR (i), to produce ramp signal Vra (i) to be provided to comparator COM (i).In the case, ramp signal Vra (i) can and the i-th+1 group to output voltage signal to N group output voltage signal (i.e. output voltage signal VO (i+1) ~ VO_ (N)) relevant.Comparator COM (i) is then used for according to error voltage signal Ve2_ (i) and ramp signal Vra (i), produce power distributes control signal SD (i) to logic control element 606, and then makes real-time voltage stabilizing adjustment by logic control element 606.That is, i-th slope adjustment pulse wave width modulation device (i.e. slope adjustment pulse wave width modulation device RA_ (i)) energy information except there being i-th grade (i.e. output OUT (i)) to export, also can obtain the energy information (i.e. the energy that output OUT (i+1) ~ OUT (N) is assigned at present) of several grades thereafter by ramp signal Vra (i).
In the present invention, each slope adjustment pulse wave width modulation device can take into account the change of the output voltage signal of rear class, and the situation that the slope of ramp signal Vra (i) can be interrogated along with the output voltage of rear class and changing to some extent.For example, in slope adjustment pulse wave width modulation device RA_2, except considering the output energy information of output OUT2, also output OUT3 and OUT4 energy assigned at present can be obtained by ramp signal Vra (2).When the output voltage signal of the 2nd grade (i.e. output voltage signal VO_2) is on the low side, charge/discharge control unit 602 can produce charge/discharge control signal SD_0 according to sum voltage signal Vsum, increases with the energy demand of notification logic control unit 606 charge/discharge mode.Now, error voltage signal Ve2_2 also can be lifted, on the low side to notify that slope adjustment pulse wave width modulation device RA_2 current inductance 600 is assigned to the energy of output OUT2.In the case, if when the energy of the output voltage signal VO_3 of output OUT3 is also on the low side, the slope of ramp signal Vra (2) just can increase, the pulse bandwidth exported after being compared with error voltage signal Ve2_2 by ramp signal Vra (2) by comparator COM_2 thus just can be limited, this is equivalent to inform logic control element 606, although the energy being assigned to output OUT2 is not enough, but the output voltage signal VO_3 due to rear class output stage (i.e. output OUT3) has the problem of energy shortage too, so the maximum electricity of the energy being assigned to output OUT2 will be limited.Therefore, when the energy shortage that error voltage signal Ve2_2 display translation end OUT2 is assigned at present, and during ramp signal Vra (2) energy shortage that also display translation end OUT3 and OUT4 is assigned at present, the energy distribution control signal SD_2 at comparator COM_2 will be reacted, in the case, logic control element 606 will reduce the energy being dispensed to output OUT2, output OUT2 is dispensed to avoid the remaining energy of inductance 600 to concentrate, simultaneously, because the energy accumulated that inductance 600 is current must be not enough to produce the demand meeting each output voltage signal, charge/discharge control unit 602 also can control according to this, inductance 600 is made to continue charging to accumulate more energy.In brief, energy distribution control unit 604 of the present invention can by the situation of feedforward (feedforwrd) rear class output stage energy, and can have the control ability of real time reaction rear class energy information and flexibly distribute energy weight under energy distribution pattern.
In fig. 8, slope adjustment pulse wave width modulation device RA_ (i) also comprises a Resetting Switching SW_R, be used for according to the reset control signal CKout of a short pulse wave width, periodically reset process is carried out to ramp signal Vra (i), control to reach periodic pulse wave width modulation.That is, ramp signal Vra (i) of adjustable slope is periodically discharged, reach the effect of fixed-frequency control.In addition, slope adjustment pulse wave width modulation device RA_ (i) also comprises a DC current source 802 and is used to provide an electric current I to electric capacity CR (i), to compensate total system stability.
Please refer to Fig. 9, Fig. 9 is the coherent signal waveform schematic diagram that the pulse wave width modulation device 304 of Fig. 4 and the slope of Fig. 8 adjust pulse wave width modulation device RA (i).Wherein, inductive drop signal Vsen represents the induced voltage signal of inductance 600, and its slope is Si.Triangular signal Va represents the triangular signal Va of Fig. 4, and its slope is Sa.Ramp signal Vramp represents the ramp signal Vramp of Fig. 4, and its slope is (Si+Sa).Ramp signal Vra (i) represents ramp signal Vra (i) of Fig. 8.Reset control signal CKout is the reset control signal CKout of Fig. 8.In general, due to the mode that the meeting of control of traditional pulse wave width modulation produces according to ramp signal Vramp, divide into voltage mode (voltage mode, VM)/current-mode (current mode, CM), if the generation of ramp signal Vramp and inductive current (Vsen) is information-related, then the pulse wave width modulation being considered as current-mode controls; If the generation of ramp signal Vramp is with completely irrelevant with the information of inductive current, then the pulse wave width modulation being considered as voltage mode controls.As shown in Figure 4, in order to the stable consideration of system, the ramp signal Vramp that traditional pulse wave width modulation control can utilize inductor current signal Vsen and the triangular signal Va of fixed slope to be added and produce to make comparisons with corresponding voltage error signal.But when the slope of ramp signal Vramp is larger, in identical voltage error signal level, the pulse bandwidth obtained will be lower.Compare down, in the present invention, because ramp signal Vra (i) is relevant with the situation of rear class output stage energy, therefore, as shown in Figure 9, the slope of ramp signal Vra (i) can be done to change with the situation of change of rear class output voltage signal, and that is, the present invention can have real time reaction rear class energy information and the control ability of flexibly distribute energy weight under energy distribution pattern.
Here, it is noted that aforesaid example is only for application of the present invention is described, be not restrictive condition of the present invention, those skilled in the art work as can do different changes according to this.For example, switch type converter 60 of the present invention is the switch type converters with 4 output voltage signals for example explains, but not as limit, any structure by single inductance can provide the switch type converter of the different output voltage signal of many groups all to realize by the framework of charge/discharge control unit of the present invention, energy distribution control unit and logic control element, and associated component can do suitable change according to the quantity of the output voltage signal that can provide, do not repeat them here.In addition, charge/discharge control unit 602 and energy distribution control unit 604 also can share relevant voltage ratio device, for example, please refer to Figure 10, and Figure 10 is the charge/discharge control unit 602 of Fig. 7 and another schematic diagram of energy distribution control unit 604.Energy distribution control unit 604 can omit the setting of voltage ratio device VS5 ~ VS8, that is, by error amplifier EA5 ~ EA8 is coupled to voltage ratio device VS1 ~ VS4 respectively, carry out proportional voltage signal VS_1 ~ VS_4 that receiver voltage proportioner VS1 ~ VS4 exports, and according to proportional voltage signal VS_1 ~ VS_4 and reference voltage signal Vref_1, produce error voltage signal Ve2_1 ~ Ve2_4.On the other hand, the switch type converter 60 of Fig. 6 also comprises a flywheel switch SW_F, is coupled to the two ends of inductance 600.Logic control element 606 can produce a flywheel switch control signal SC_5 to control the keying of flywheel switch SW_F simultaneously, switch type converter 60 to be switched to a virtual continuous current conducting (pseudo continuous current conduction, PCCM) pattern.Certainly, if system does not need to operate in virtual continuous current conducting, then flywheel switch SW_F and flywheel switch control signal SC_5 also can omit.
Operation about switch type converter 60 can be summarized as a flow process 110, as shown in figure 11.Flow process 110 comprises the following steps:
Step 1100: start.
Step 1102: according to inductive drop signal and N number of output voltage signal, produces charge/discharge control signal.
Step 1104: according to N number of output voltage signal, produces N number of energy distribution control signal, and wherein, i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal.
Step 1106: according to charge/discharge control signal and N number of energy distribution control signal, produce charge switch control signal to control the keying of charge switch, and produce N number of output switch control signal to control the keying of N number of output switch, and then make the energy storage of input voltage to inductance and make the energy distribution stored by inductance to N number of output.
Step 1108: terminate.
The details of flow process 110 with reference to aforementioned explanation, can not repeat them here.
In sum, single inductance multi output switch type converter 30 compared to Fig. 3 must wait until that afterbody exports the situation just judging system capacity, the present invention, by the running of charge/discharge control unit 602, is relevant to the output summation of the error amplifier of each output voltage signal by detecting and whether the energy of energy real-time judge charge/discharge mode meets demand.In other words, the present invention fast reaction in real time can go out required energy summation, and not enough situation occurs for energy that more energy can be assigned to each output under avoiding energy distribution pattern in time to allow inductance accumulate.The more important thing is, the present invention can by the situation of feedforward rear class output stage energy by the running of energy distribution control unit 604, to have the control ability of real time reaction rear class energy information and flexibly and flexibly distribute energy weight under energy distribution pattern.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a switch type converter, comprising:
One input, is used for reception one input voltage signal;
N number of output, is used for exporting N number of output voltage signal, and wherein, N is a positive integer;
One inductance, is coupled to this input, is used for storing the energy of this input voltage;
One charge switch, is coupled to this inductance, is used for, according to a charge switch control signal, controlling the charge path of this inductance;
N number of output switch, is coupled to this inductance, is used for according to N number of output switch control signal, controls the signal transmission path between this inductance and this N number of output;
One charge/discharge control unit, be coupled to this N number of output, be used for according to an inductive drop signal and a sum voltage signal, produce a charge/discharge control signal, wherein this sum voltage signal is the summation of N number of first error voltage signal of this N number of output voltage signal respectively and between one first reference voltage signal;
One energy distribution control unit, be coupled to this N number of output, be used for according to this N number of output voltage signal, produce N number of energy distribution control signal, wherein, i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal, and wherein 1≤i≤N, i is a positive integer; And
One logic control element, be used for according to this charge/discharge control signal and this N number of energy distribution control signal, produce this charge switch control signal to control the keying of this charge switch, and produce this N number of output switch control signal to control the keying of this N number of output switch, and then make the energy storage of this input voltage to this inductance and make the energy distribution stored by this inductance to this N number of output.
2. switch type converter as claimed in claim 1, it is characterized in that, this charge/discharge control unit comprises:
N number of first voltage ratio device, is coupled to this N number of output, is used for, according to this N number of output voltage signal, exporting N number of first proportional voltage signal;
N number of first error amplifier, is coupled to this N number of first voltage ratio device, is used for, according to this N number of first proportional voltage signal and one first reference voltage signal, producing N number of first error voltage signal;
One first electric capacity, is coupled to this N number of first error amplifier, is used for, according to this N number of first error voltage signal, producing a sum voltage signal; And
One pulse wave width modulation device, is coupled to this N number of first error amplifier and this first electric capacity, is used for, according to this sum voltage signal and this inductive drop signal, producing this charge/discharge control signal.
3. switch type converter as claimed in claim 2, it is characterized in that, each the first voltage ratio device is coupled to one of them of this N number of output, and export the first corresponding proportional voltage signal according to corresponding output voltage signal, and each first error amplifier is coupled to this N number of first voltage ratio device one of them, be used for, according to the first corresponding proportional voltage signal and this first reference voltage signal, producing the first corresponding error voltage signal.
4. switch type converter as claimed in claim 1, is characterized in that, when this charge/discharge control signal represents that gross energy is not enough, this logic control element produces this charge switch control signal to control this charge switch, charges to make this inductance.
5. switch type converter as claimed in claim 1, it is characterized in that, this energy distribution control unit comprises:
N number of second voltage ratio device, is coupled to this N number of output, is used for, according to this N number of output voltage signal, exporting N number of second proportional voltage signal;
N number of second error amplifier, is coupled to this N number of second voltage ratio device, is used for, according to this N number of second proportional voltage signal and one second reference voltage signal, producing N number of second error voltage signal;
N number of second electric capacity, is respectively coupled to this N number of second error amplifier; And
N number of slope adjustment pulse wave width modulation device, be coupled to this N number of second error amplifier and this N number of second electric capacity, be used for according to this N number of second error voltage signal, produce this N number of energy distribution control signal, wherein this i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal.
6. switch type converter as claimed in claim 5, is characterized in that, i-th slope adjustment pulse wave width modulation device comprises:
(N-i) individual 3rd error amplifier, be coupled to (i+1) individual output to N number of output, be used for outputing voltage signal to N number of output voltage signal according to (i+1) is individual, produce (N-i) individual 3rd error voltage signal;
One the 3rd electric capacity, be coupled to this (N-i) individual 3rd error amplifier, be used for according to being somebody's turn to do (N-i) individual 3rd error voltage signal, produce a ramp signal, wherein the slope of this ramp signal is relevant to individual this N number of output voltage signal that outputs voltage signal to of this (i+1);
One comparator, is coupled to this i-th second error amplifier and the 3rd electric capacity, is used for according to i-th the second error voltage signal and this ramp signal, produces i-th energy distribution control signal.
7. switch type converter as claimed in claim 6, it is characterized in that, this switch type converter also comprises a Resetting Switching, be coupled to this (N-i) individual 3rd error amplifier and the 3rd electric capacity, be used for, according to a reset control signal, periodically carrying out reset process to this ramp signal.
8. switch type converter as claimed in claim 6, it is characterized in that, this switch type converter also comprises a DC current source, is coupled to this (N-i) individual 3rd error amplifier and the 3rd electric capacity, is used to provide an electric current to the 3rd electric capacity.
9. switch type converter as claimed in claim 5, it is characterized in that, each second voltage ratio device be coupled to this N number of output one of them and according to corresponding output voltage signal, export the second corresponding proportional voltage signal, and each second error amplifier is coupled to this N number of second voltage ratio device one of them, be used for, according to the second corresponding proportional voltage signal and this second reference voltage signal, producing the second corresponding error voltage signal.
10. switch type converter as claimed in claim 1, it is characterized in that, this switch type converter also comprises N number of output capacitance, is respectively coupled to this N number of output switch, and the energy being used for storing this inductance N number ofly outputs voltage signal to this N number of output to provide this.
11. switch type converters as claimed in claim 1, it is characterized in that, this switch type converter also comprises a flywheel switch, be coupled to the two ends of this inductance, it is characterized in that, this logic control element, according to this charge/discharge control signal and this N number of energy distribution control signal, produces a flywheel switch control signal to control the keying of this flywheel switch.
12. 1 kinds of control methods, comprising:
One switch type converter is provided, this switch type converter comprises an input, N number of output, one inductance, one charge switch and N number of output switch, this input is used for reception one input voltage signal, this N number of output is used for exporting N number of output voltage signal, wherein, N is a positive integer, this inductance is coupled to this input and is used for storing the energy of this input voltage, this charge switch is coupled to this inductance and is used for controlling according to a charge switch control signal charge path of this inductance, this N number of output switch is coupled to this inductance and is used for the signal transmission path controlling between this inductance and this N number of output according to N number of output switch control signal,
According to an inductive drop signal and a sum voltage signal, produce a charge/discharge control signal, wherein this sum voltage signal is the summation of N number of first error voltage signal of this N number of output voltage signal respectively and between one first reference voltage signal;
According to this N number of output voltage signal, produce N number of energy distribution control signal, wherein, i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal, and wherein 1≤i≤N, i is a positive integer; And
According to this charge/discharge control signal and this N number of energy distribution control signal, produce this charge switch control signal to control the keying of this charge switch, and produce this N number of output switch control signal to control the keying of this N number of output switch, and then make the energy storage of this input voltage to this inductance and make the energy distribution stored by this inductance to this N number of output.
13. control methods as claimed in claim 12, is characterized in that, according to an inductive drop signal and this N number of output voltage signal, the step producing this charge/discharge control signal comprises:
According to this N number of output voltage signal, export N number of first proportional voltage signal;
According to this N number of first proportional voltage signal and one first reference voltage signal, produce N number of first error voltage signal;
According to this N number of first error voltage signal, produce a sum voltage signal; And
According to this sum voltage signal and this inductive drop signal, produce this charge/discharge control signal.
14. control methods as claimed in claim 12, is characterized in that, when this charge/discharge control signal represents that gross energy is not enough, produce this charge switch control signal to control this charge switch, charge to make this inductance.
15. control methods as claimed in claim 12, is characterized in that, according to this N number of output voltage signal, the step producing this N number of energy distribution control signal comprises:
According to this N number of output voltage signal, export N number of second proportional voltage signal;
According to this N number of second proportional voltage signal and one second reference voltage signal, produce N number of second error voltage signal; And
According to this N number of second error voltage signal, produce this N number of energy distribution control signal, wherein, this i-th energy distribution control signal is relevant to i-th and outputs voltage signal to N number of output voltage signal.
16. control methods as claimed in claim 15, is characterized in that, according to this N number of second error voltage signal, the step producing this N number of energy distribution control signal comprises:
Output voltage signal to N number of output voltage signal according to (i+1) is individual, produce (N-i) individual 3rd error voltage signal;
According to this (N-i) individual 3rd error voltage signal, produce a ramp signal, wherein the slope of this ramp signal is relevant to individual this N number of output voltage signal that outputs voltage signal to of this (i+1);
According to i-th the second error voltage signal and this ramp signal, produce i-th energy distribution control signal.
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| CN105991029B (en) * | 2015-02-05 | 2018-11-30 | 通嘉科技股份有限公司 | Using the single inductor multi-output power converter of adaptability grid bias technology |
| CN104638920B (en) * | 2015-02-11 | 2017-03-01 | 东南大学 | The controllability method of attachment at single inductor multi-output power changer secondary switch tube lining bottom and its circuit |
| US9941790B2 (en) * | 2015-08-19 | 2018-04-10 | Qualcomm Incorporated | DC-to-DC converter |
| US10291126B1 (en) * | 2018-10-18 | 2019-05-14 | BravoTek Electronics Co., Ltd. | Single-inductor multiple-output DC/DC converters with pulse-skipping mode and deadtime switch control |
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| US20040201281A1 (en) * | 2003-01-17 | 2004-10-14 | The Hong Kong University Of Science And Technology | Single-inductor multiple-output switching converters in PCCM with freewheel switching |
| US20080231115A1 (en) * | 2007-03-16 | 2008-09-25 | Gyuha Cho | Multiple-Output DC-DC Converter |
| CN102084581A (en) * | 2008-05-15 | 2011-06-01 | 努吉拉有限公司 | Single inductor multiple output converter |
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| US20040201281A1 (en) * | 2003-01-17 | 2004-10-14 | The Hong Kong University Of Science And Technology | Single-inductor multiple-output switching converters in PCCM with freewheel switching |
| US20080231115A1 (en) * | 2007-03-16 | 2008-09-25 | Gyuha Cho | Multiple-Output DC-DC Converter |
| CN102084581A (en) * | 2008-05-15 | 2011-06-01 | 努吉拉有限公司 | Single inductor multiple output converter |
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