CN102324845A - Control method for single-inductance double-output DC-DC (direct current) switching power supply and circuit thereof - Google Patents
Control method for single-inductance double-output DC-DC (direct current) switching power supply and circuit thereof Download PDFInfo
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- CN102324845A CN102324845A CN201110285931A CN201110285931A CN102324845A CN 102324845 A CN102324845 A CN 102324845A CN 201110285931 A CN201110285931 A CN 201110285931A CN 201110285931 A CN201110285931 A CN 201110285931A CN 102324845 A CN102324845 A CN 102324845A
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Abstract
The invention relates to a control method for a single-inductance double-output DC-DC (direct current) switching power supply and a circuit thereof. Two DC-DC converters are integrated in one chip to generate outputs of two voltages. Two output branches share one inductance. A time sharing multiplex primary and secondary loop control method is adopted. A time sharing conduction switch is arranged at an output end of each output branch. One clock period is divided into a plurality of units. In each divided unit of the clock period, one path of output is independently controlled. The control method is characterized in that a secondary loop which comprises two comparators and a gating signal generation selection circuit which comprises a digital logic circuit are arranged to control a secondary loop power tube, so that the sizes of load currents of two paths of outputs are random; and in each switching period, control gating signals are sent to the two branches and the two gating signals have opposite phases, so that two secondary switches are respectively turned on and turned off for once in the ascending and descending stages of an inductive current, and thus, the stable outputs of the two branches are realized.
Description
Technical field
The present invention relates to power supply changeover device, particularly, belong to microelectronics technology at the control method and the circuit thereof of a kind of single inductance dual-output DC-DC Switching Power Supply of IC interior.
Background technology
In the integrated circuit fields, in order to reduce the performance that power consumption keeps integrated circuit simultaneously, the multivoltage power supply becomes main flow trend in modern times, can provide two (many) roads of single inductance voltage output DC-DC conversion chip of the different voltages of two-way (and multichannel) to arise at the historic moment.The DC-DC transducer of the single inductance two-way voltage output of tradition; Control method is various; Wherein the single inductance dual-output DC-DC of peak electricity flow pattern has higher transformation efficiency and less voltage ripple because of it; Thereby become the focus of research, existing control circuit (Fig. 1) is that major loop is traditional peak-current mode that works in continuous current pattern (CCM), and the control of inferior loop is still for working in the peak-current mode of continuous current pattern (CCM).This control mode has a defective: as shown in Figure 2; Owing to only control time loop with a comparator; So can only in inductance rise time section, produce a secondary loop control signal, control the loop power tube two times, cause the load current range of two-way output limited.Be embodied in one tunnel load current and must be lower than other one tunnel load current; (being the load current of the load current of first branch road in example shown in Figure 2) less than second branch road otherwise; Single inductance two-way output DC-DC converter system can produce vibration, causes the output voltage ripple greater than normality.
Summary of the invention
The present invention on the basis of existing technology; A kind of control method and circuit thereof of single inductance dual-output DC-DC switch converters are provided; Adopt the major loop control model identical with prior art, add and improved the inferior loop that is made up of two comparators and produced by the gating signal that Digital Logical Circuits constitutes and selected circuit to control time loop power tube, the load current size that can make two-way output arbitrarily; Do not receive above-mentioned restriction, single inductance dual-output DC-DC transducer still keeps stable simultaneously.
Technical scheme of the present invention is: a kind of control method of single inductance dual-output DC-DC Switching Power Supply, integrated two DC-DC converters in chip piece, the output that produces two kinds of voltages; The shared inductance of two output branch roads; Adopt master, the inferior loop control method of time-sharing multiplex, the timesharing actuating switch is set, a clock cycle is divided into a plurality of unit at each output of exporting branch road; In each clock cycle division unit, separately one tunnel output is controlled; Be provided with major loop control circuit, inferior loop control circuit, drive circuit, voltage sampling circuit and power stage circuit; It is characterized in that: inferior loop control circuit that comprises two comparators formations and the gating signal generation that comprises the Digital Logical Circuits formation are set select circuit to control inferior loop power tube; Make the load current size of two-way output any; In each switch periods, all send the control gating signal to two branch roads, and two mutual anti-phases of gating signal; Make two secondary switch rise and open respectively and turn-off once in the decline stage, realize the stable output of two branch roads at inductive current.
Realize the circuit of the control method of above-mentioned single inductance dual-output DC-DC Switching Power Supply; Be provided with major loop control circuit, inferior loop control circuit, drive circuit, voltage sampling circuit and power stage circuit; The output of major loop control circuit connects time loop control circuit, and the major loop control circuit also is connected with drive circuit is two-way, and inferior loop control circuit output connects drive circuit; Drive circuit output connects power stage circuit; Power stage circuit output is connected with major loop control circuit and time loop control circuit respectively through voltage sampling circuit, and power stage circuit output also connects the major loop control circuit, and it is characterized in that: the secondary loop control circuit comprises first voltage comparator and second voltage comparator; The positive input termination reference voltage of first voltage comparator; Negative input end connects the first branch road sampled voltage signal, and the anode input of second voltage comparator connects the second branch road sampled voltage signal, and the negative terminal input connects reference voltage;
A gating signal that is connected between secondary loop control circuit and the drive circuit is set produces and the selection circuit, comprise that the burst pulse that connects successively produces circuit, latch cicuit, selection circuit and shaping circuit; Wherein:
Burst pulse produces circuit and is provided with first～the 66 NAND gate, 2 resistance R 1, R2,2 capacitor C 1, C2 and first, second 2 inverters; Two inputs of first NAND gate all connect the clock signal of oscillator in the major loop control circuit and are connected with an input of second NAND gate; The output of first NAND gate connects an end of resistance R 1; The other end of resistance R 1 connects an end of capacitor C 1 and another input of second NAND gate; The other end ground connection of capacitor C 1, two inputs of the output of second NAND gate and the 3rd NAND gate link together, and the output of the 3rd NAND gate connects the input of first inverter; Two defeated duty cycle signals that all connect digital logic module output in the major loop control circuit of the 4th NAND gate; The output of the 4th NAND gate connects an end of resistance R 2; The other end of resistance R 2 connects an end of capacitor C 2 and an input of the 5th NAND gate; The other end ground connection of capacitor C 2; The duty cycle signals of digital logic module output in another input termination major loop control circuit of the 5th NAND gate, two inputs of the output of the 5th NAND gate and the 6th NAND gate link together, and the output of the 6th NAND gate connects the input of second inverter;
Latch cicuit is provided with 2 first d type flip flop and second d type flip flop and the 3rd, the 4 two inverters with asynchronous resetting function; The data input pin of the input of the 3rd inverter and second d type flip flop all connects the duty cycle signals of digital logic module output in the major loop control circuit; The input of the 4th inverter connects the output of first comparator in the secondary loop control circuit; The data input pin of first d type flip flop connects the output of the 3rd inverter; The input end of clock of first d type flip flop connects the output of second comparator in the secondary loop control circuit; The zero clearing input of first d type flip flop connects the output that burst pulse produces first inverter in the circuit; The input end of clock of second d type flip flop connects the output of the 4th inverter, and the zero clearing input of second d type flip flop connects the output that burst pulse produces second inverter in the circuit;
Select circuit to be provided with first～the 44 alternative data selector; A data input of first data selector connects the output of second d type flip flop in the latch cicuit; The in-phase clock input of first, second two data selectors all connects the duty cycle signals of digital logic module output in the major loop control circuit; The inversion clock input of first, second two data selectors all connects the output of the 3rd inverter in the latch cicuit; The equal ground connection of another data input pin of first, second two data selectors; A data input of second data selector connects the output of first d type flip flop in the latch cicuit; A data input of the 3rd data selector connects the output of first data selector; Three, the in-phase clock input of the 4 two data selector all connects the duty cycle signals of digital logic module output in the major loop control circuit; Three, the inversion clock input of the 4 two data selector all connects the output of the 3rd inverter in the latch cicuit, the equal ground connection of another data input pin of the 3rd, the 4 two data selector, and a data input of the 4th data selector connects the output of second data selector.
Shaping circuit is provided with first, second two NOR gates and the 5th, the 6 two inverter; The output of the 4th data selector in the circuit is selected in an input selecting of first NOR gate; Another input of first NOR gate connects the output of selecting first data selector in the circuit; The output of first NOR gate connects the input of the 5th inverter; An input of second NOR gate connects the output of selecting the 3rd data selector in the circuit; Another input of second NOR gate connects the output of selecting second data selector in the circuit, and the input of hex inverter connects the output of second NOR gate, and the output of the 5th, the 6 two inverter produces the gating control signal of control time loop power tube switch.
Advantage of the present invention and remarkable result:
(1) inferior loop control circuit that comprises two comparators formations and the gating signal generation that comprises the Digital Logical Circuits formation being set selects circuit to control inferior loop power tube; Make the load current size of two-way output any; In each switch periods, all send the control gating signal to two branch roads, and two mutual anti-phases of gating signal; Make two secondary switch rise and open respectively and turn-off once in the decline stage, realize the stable output of two branch roads at inductive current.In one-period, produce two gating signals; Control the conducting and the shutoff of the first branch power pipe and the second branch power pipe respectively; Overcome because single gating signal control simultaneously during two branch power pipes; Can only be by the feedback signal of the big branch road of load current as the control major loop, thus another branch road load current that causes must be less than the shortcoming of this branch road load current.
(2) this control circuit is simple and easy to realize, the secondary loop that only needs two comparators of design to constitute, and the strobe generation circuit that Digital Logic constitutes can be realized above-mentioned functions, and control method is simple and reliable, and circuit is prone to realize, and it is little to improve the shared chip area of circuit.
Description of drawings
Fig. 1 is the electric theory diagram of prior art;
Fig. 2 is the sequential and the inductive current figure of prior art;
Fig. 3 is an electric theory diagram of the present invention;
Fig. 4 is a kind of concrete realization circuit of the present invention;
Fig. 5 selects a kind of implementation of circuit for gating signal in the circuit of the present invention;
Fig. 6 is Fig. 4 circuit control sequential chart (power tube of high level expression signal control is opened).
Embodiment
Like Fig. 3, the present invention is provided with major loop control circuit 1, inferior loop control circuit 2, strobe generation circuit 3, drive circuit 4, voltage sampling circuit 5 and power stage circuit 6.Fig. 1 compares with prior art; Major loop control circuit 1, drive circuit 4, voltage sampling circuit 5 and power stage circuit 6 are identical with the prior art structure; But inferior loop control circuit 2 is different with prior art, and other has increased the strobe generation circuit 3 that is connected between time loop control circuit 2 and the drive circuit 4.
Like Fig. 4, major loop control circuit 1 comprises reference voltage generating circuit, error comparator EA, oscillator and slope equalizer, peak current detection circuit and opposite current detection circuit, PWM modulator, current-limiting circuit, Digital Logic.The inverting input of major loop error amplifier EA connects the end of sampling resistor R5, R6, R7 in the sample circuit, and in-phase input end connects the output voltage of reference voltage generating circuit; The drain electrode of anode, major loop power tube Mp1 and the Mp2 of an input termination inductance L X of opposite current detection circuit, another input end grounding; The drain electrode of anode, major loop power tube Mp1 and the Mp2 of the input termination inductance L X of current detection circuit; The input of slope equalizer connects the output of oscillator; The inverting input of PWM modulator connects the output of major loop error amplifier EA, and in-phase input end connects the output of slope equalizer, current detection circuit; The output of the input termination PWM modulator of Digital Logical Circuits, current detection circuit, slope equalizer, oscillator, the output of Digital Logical Circuits produce control signal SN, the SP of control major loop power tube switch.
The grid of the major loop first power tube Mp1 meets the duty ratio drive signal PD that major loop produces, and the source electrode of Mp1 meets input supply voltage Vin, the drain electrode of Mp1 connect inductance L X anode and the major loop second power tube Mn1 drain electrode in.The grid of the major loop second power tube Mp2 connects the duty ratio drive signal ND that major loop produces, the source ground of Mn1.The negative terminal of inductance L X connects the source electrode of branch power pipe Mp2 and Mp3; The grid of branch power pipe Mp2 and Mp3 is connected gating drive signal D1 and the D2 that the gating secondary drive circuit produces respectively, and the drain electrode of branch power pipe Mp2 and Mp3 is connected the end of the anode of branch road output filter capacitor C1 and C2, load resistance Ro1 and Ro2 and the sampling resistor R1 of sample circuit, the end of R2 respectively.The other end of the sampling resistor R1 of sample circuit connects the end of sampling resistor R3, the inverting input of branch road comparator C MP1 respectively.The other end of the sampling resistor R2 of sample circuit connects the in-phase input end of sampling resistor R4, branch road comparator C MP2 respectively.The other end ground connection of sampling resistor R3, R4.The in-phase input end of the in-phase input end of branch road comparator C MP1, the inverting input of CMP2, error amplifier and the output of reference voltage connect.The output of branch road comparator C MP1 selects circuit to be connected with gating signal.The output of branch road comparator C MP2 selects circuit to be connected with gating signal.The output of oscillator selects circuit, Digital Logical Circuits to be connected with harmonic compensation circuit, gating signal.
Drive circuit 4 comprises driving and dead band control circuit, is the circuit structure of maturation, and its internal structure repeats no more at this.Output signal S1, S2 that the output signal SN that the input termination major loop control circuit of this circuit produces, SP and inferior loop control circuit produce; The output of drive circuit produces drive signal D1, the D2 of drive signal PD, ND and the control time loop power tube switch that drives major loop power tube switch.
Power stage circuit 6 comprises the circuit of synchronous rectification that the first power tube Mp1 and the second power tube Mn1 constitute, inductance L X, and branch power pipe Mp2 and Mp3.The grid of the first power tube Mp1 meets the duty ratio drive signal PD that major loop produces, and the source electrode of Mp1 meets input supply voltage Vin; The grid of the second power tube Mn1 connects the duty ratio drive signal ND that major loop produces, the source ground of Mn1; The grid of branch power pipe Mp2 and Mp3 is connected gating drive signal D1 and the D2 that the gating secondary drive circuit produces respectively; The drain electrode of branch power pipe Mp2 and Mp3 is connected an end and the sampling resistor R1 of sample circuit of anode, load resistance Ro1 and the Ro2 of branch road output filter capacitor C1 and C2, the end of R2 respectively; The drain electrode of the positive termination first power tube Mp1 of inductance L X, the drain electrode of the second power tube Mn1, the negative terminal of inductance L X connects the source electrode of branch power pipe Mp2 and Mp3.
Voltage sampling circuit 5 comprises sampling resistor R1, R2, R3, R4, R5, R6, R7; Annexation is following: the end of sampling resistor R1, R2 connects the end of anode, load resistance Ro1 and Ro2 of drain electrode, branch road output filter capacitor C1 and the C2 of branch power pipe Mp2 and Mp3 respectively, and the other end of sampling resistor R1 connects the end of sampling resistor R3, the inverting input of branch road comparator C MP1 respectively.The other end of the sampling resistor R2 of sample circuit connects the in-phase input end of sampling resistor R4, branch road comparator C MP2 respectively.The other end ground connection of sampling resistor R3, R4; The end of sampling resistor R5, R6, R7 connects the inverting input of major loop error amplifier EA; Another termination first branch road output voltage of R5, another termination second branch road output voltage of R6, the other end ground connection of R7.
Foregoing circuit is the control loop of typical peak-current mode, is mature technology.
Secondary loop control circuit 2 comprises the first branch voltage comparator C MP1 and the second branch road comparator C MP2.The positive input termination reference voltage V ref of CMP1 wherein, negative input end meets the first branch road sampled voltage signal Vo1, when the output voltage VO UT1 of first branch road surpasses set point, exports a trailing edge signal Vcmp1.The anode input of CMP2 meets the second branch road sampled voltage signal Vo2, and the negative terminal input meets reference voltage signal Vref, when the output voltage VO UT2 of second branch road surpasses set point, exports a rising edge signal Vcmp2.
Referring to Fig. 5, gating signal selects circuit 3 to produce the input duty cycle signal S1 and the S2 of one group of driver module.Gating signal selects circuit 3 to comprise that burst pulse produces circuit 7, and latch cicuit 8 is selected circuit 9 and shaping circuit 10, and burst pulse produces circuit 7 by NAND gate nand2, resistance R 1, R2 and capacitor C 1, C2, inverter 1, inverter 2.The shaping circuit that NAND gate nand2 and inverter constitute produces one group of narrow pulse signal CLK_pulse and SP_pulse.Latch cicuit 8 is made up of two effective 2 d type flip flops of rising edge with asynchronous resetting function; Latch the trailing edge of Vcmp1 and the rising edge of Vcmp2, avoid because comparator C MP1 and CMP2 relatively form interference to the switch of branch power pipe because of the mistake that noise or the like reason causes.Select circuit 9 to constitute by 4 alternative data selector MUX1 to MUX4; When wherein MUX1 and MUX2 are created in major loop first power tube Mp1 and the major loop second power tube Mn1 conducting respectively; Gating control signal S1_PD and the S1_ND of the first branch power pipe Mp2; When MUX3 and MUX4 are created in major loop first power tube Mp1 and the major loop second power tube Mn1 conducting respectively, gating control signal S2_PD and the S2_ND of the second branch power pipe Mp3.The gating control signal Si (i=1,2) that shaping circuit 10 is combined into smooth and continuous with the gating control signal Si_PD and the Si_ND (i=1,2) of segmentation.Voltage sampling circuit 5 is in series by the resistance of the different resistances of three groups of groups, chooses suitable resistance, makes sampled voltage Vo1, Vo2 and the K of three sample circuits * (Vo1+Vo2) can compare with same reference voltage V ref.Gating signal selects output signal S1, the S2 of circuit to be connected respectively with the input of drive circuit.
The input that burst pulse produces circuit 7 connects the CLK signal; The data input pin of d type flip flop DFF1, the data-signal input of selection circuit MUXi (i=1,2,3,4) connect in another input of input of burst pulse generation circuit, the latch cicuit 8; Connect the SP signal, the SP signal connects the data input pin of d type flip flop DFF2 in the latch cicuit, the inversion clock signal input part of selection circuit MUXi (i=1,2,3,4) after anti-phase.Two outputs of narrow pulse generator are connected with the data clear terminal of two d type flip flop DFF1, DFF2 in the latch cicuit respectively.The inversion signal of the output signal Vcmp1 of the data input pin of d type flip flop DFF1 and branch road comparator C MP1 is connected in the latch cicuit, and the data input pin of d type flip flop DFF2 is connected with the output of branch road comparator C MP2 in the latch cicuit.The output Q1 of d type flip flop DFF2, DFF1, Q2 are connected with first data input pin (S1) of selecting circuit MUX1, MUX2 respectively in the latch cicuit.First data input pin (S1) of the output MO1 of MUX1 and MUX3, the input of shaping circuit are connected.First data input pin (S2) of the output MO2 of MUX2 and MUX4, the input of shaping circuit are connected.Second input (S2) of MUXi (i=1,2,3,4) is ground connection all.The output MO3 of MUX3 and the input of shaping circuit are connected, and the output MO4 of MUX4 and the input of combinational circuit are connected.
The operation principle of circuit of the present invention: the master, the inferior loop control method that adopt time-sharing multiplex; Output at each output branch road is provided with the timesharing actuating switch; A clock cycle is divided into a plurality of unit, in each clock cycle division unit, separately one tunnel output is controlled.Setting comprises that two comparators inferior loop that constitutes and the gating signal that comprises the Digital Logical Circuits formation produce the selection circuit and control time loop power tube; Make the load current size of two-way output any, in each switch periods, all send the control gating signals to two branch roads; And two mutual anti-phases of gating signal; Make two secondary switch inductive current rise with the decline stage in respectively switch once, each cycle is when beginning, by the clock signal unlatching major loop power tube and the second branch power pipe; Sample respectively and send into the comparison of error amplifier and reference voltage after the output voltage of the first and second output branch roads; Produce first negative-feedback signal, select first negative-feedback signal to compare, produce the drive signal of control major loop power tube switch with triangular signal and sensed current signal; The output voltage of second branch road of sampling is sent into first comparator and reference voltage relatively, produces second negative-feedback signal; The sample output voltage of first branch road is sent into second comparator and reference voltage relatively, produces the 3rd negative-feedback signal; When second negative-feedback signal is higher than reference voltage, produce high level signal, be used to turn-off the second branch power pipe and open the first branch power pipe; When the 3rd negative-feedback signal is higher than reference voltage, produce high level signal, be used to turn-off the first branch power pipe and open the second branch power pipe.
The charging of (1) second branch road:; Each cycle is when beginning; Clock signal of system CLK opens the major loop first power tube Mp1, and CLK produces the burst pulse that circuit produced through burst pulse and will open the second branch power pipe Mp2 simultaneously simultaneously, and input voltage vin provides energy to the second output branch road; The sampled voltage Vo2 that rises to second branch road until the output voltage of second branch road is higher than reference voltage V ref; Secondary control loop will produce the voltage signal Vcmp2 of a rising edge, and the second branch power pipe Mp3 is turn-offed, and the second branch road charging process finishes.
Charging of (2) first branch roads and afterflow: secondary control loop produces the voltage signal Vcmp2 of a rising edge; When the second branch power pipe Mp3 turn-offs; The Vcmp2 of this rising edge also opens the first branch power pipe Mp2 simultaneously, and input voltage vin provides energy for first branch road, and the first branch road output voltage rises; Until peak electricity flow pattern major loop the major loop first power tube Mp1 is turn-offed, and open the major loop second power tube Mp2.The major loop charging process finishes, and inductance gets into the afterflow stage.At this moment; The inductive current first output branch road of flowing through, the first output branch road afterflow, the first branch road output voltage continues to rise; Sampled voltage Vo1 until first branch road is higher than reference voltage V ref; Produce the Vcmp1 signal of a trailing edge, the first branch power pipe Mp2 is turn-offed, the first branch road charging process finishes;
(3) second branch road afterflows: the Vcmp1 signal of trailing edge, when the first branch power pipe Mp2 is turn-offed, open the second branch power pipe Mp3, inductive current finishes until a switch periods through the second branch power pipe Mp3 afterflow;
The process of (1)～(3) is accomplished the work that circuit goes round and begins again like this above repeating.
In each switch periods, all send the control gating signals, and two mutual anti-phases of gating signal to two branch roads, make two secondary switch inductive current rise with the decline stage in distinguish switch once;
Operating process in complete switch periods is following;
Each cycle is opened the main circuit power pipe and the second branch power pipe by clock signal when beginning;
The output voltage of the sampling first and second output branch roads is that K * (Vo1+Vo2) sends into error amplifier afterwards; Compare with reference voltage; Produce first negative-feedback signal; Select first negative-feedback signal, compare, produce the drive signal of control main power tube switch with triangular signal and sensed current signal;
The sample output voltage of second branch road is sent into comparator one, with reference voltage relatively, produce second negative-feedback signal;
The sample output voltage of first branch road is sent into comparator two, and reference voltage relatively produces the 3rd negative-feedback signal;
When second negative-feedback signal is higher than reference voltage, produce high level signal, be used to turn-off the second branch power pipe and open the first branch power pipe;
When the 3rd negative-feedback signal is higher than reference voltage, produce high level signal, be used to turn-off the first branch power pipe and open the second branch power pipe.
Major loop control circuit 1; The circuit of drive circuit 4 and power stage 6 circuit constitutes and working method can be with reference to prior art; Skip over here and do not show, below will mainly describe the main body circuit of the present invention and the course of work, be i.e. the formation and the course of work of secondary loop and branch road strobe generation circuit.
Realize that the secondary loop control circuit 2 of the switch converters of above-mentioned control mode controls based on comparator; Positive input terminal connects the first branch road sampled voltage; Negative terminal connects the first branch voltage comparator of reference voltage; Positive input terminal connects the second branch road sampled voltage, and negative terminal connects the second branch voltage comparator of reference voltage, and the output Vcmp1 of two comparators, Vcmp2 connect strobe generation circuit circuit 3.
Produce gating signal S1, the S2 that controls branch power pipe switch by strobe generation circuit 3, these two signals produce through driver module 4 backs and drive branch power pipe Mp2, the drive signal D1 of Mp3, D2;
Sample circuit 5 passes through electric resistance partial pressure; Produce one group can with relatively sampled voltage K of reference voltage * (Vo1+Vo2) (K < 1), Vo1, Vo2; Through selecting different resistance; Make sampled voltage K * (Vo1+Vo2), Vo1, Vo2 can with same reference voltage V ref relatively, make whole switch converters only use a reference voltage, save the area of reference voltage generating circuit;
Inferior loop control circuit 2 compares sampled voltage Vo2 and reference voltage V ref; When the sampled voltage Vo2 of second branch road is lower than reference voltage V ref; The Vcmp2 of the second branch voltage comparator C MP2 output low level; When the sampled voltage Vo2 of second branch road is higher than reference voltage V ref, the Vcmp2 of second branch voltage comparator C MP2 output high level;
Inferior loop control circuit 2 compares sampled voltage Vo1 and reference voltage V ref; When the sampled voltage Vo1 of first branch road is lower than reference voltage V ref; The Vcmp1 of first branch voltage comparator C MP1 output high level; When the sampled voltage Vo1 of first branch road is higher than reference voltage V ref, the Vcmp1 of the first branch voltage comparator C MP1 output low level;
Gating signal selects circuit 3 with the output signal latch of comparator and produce the gating signal of one group of control branch power pipe conducting and shutoff: when the major loop first power tube Mp1 conducting and Vcmp2 are high level by low transition; Produce a triggering signal, this triggering signal is closed the second branch power pipe Mp3 and is opened the first branch power pipe Mp2 simultaneously; After the major loop second power tube Mn1 conducting and Vcmp1 are low level by the high level saltus step, produce a triggering signal, this signal at stop first branch power pipe Mp2 also opens the second branch power pipe Mp3 simultaneously.Like this, in a switch periods, there are two signal S1 and S2 to control the first branch power pipe and the second branch power pipe;
Referring to Fig. 6; Relatively more visible with the sequential of prior art; This programme in one-period, the gating signal S1 of generation and S2 can so that the first branch power pipe and the second branch power pipe in each clock cycle, in induction charging process and the inductive discharge process; All open and turn-off once, thereby avoided the electric current of particular branches to limit.
Claims (2)
1. the control method of a single inductance dual-output DC-DC Switching Power Supply, integrated two DC-DC converters in chip piece, the output that produces two kinds of voltages; The shared inductance of two output branch roads; Adopt master, the inferior loop control method of time-sharing multiplex, the timesharing actuating switch is set, a clock cycle is divided into a plurality of unit at each output of exporting branch road; In each clock cycle division unit, separately one tunnel output is controlled; Be provided with major loop control circuit, inferior loop control circuit, drive circuit, voltage sampling circuit and power stage circuit; It is characterized in that: inferior loop control circuit that comprises two comparators formations and the gating signal generation that comprises the Digital Logical Circuits formation are set select circuit to control inferior loop power tube; Make the load current size of two-way output any; In each switch periods, all send the control gating signal to two branch roads, and two mutual anti-phases of gating signal; Make two secondary switch rise and open respectively and turn-off once in the decline stage, realize the stable output of two branch roads at inductive current.
2. circuit of realizing the control method of the said single inductance dual-output DC-DC Switching Power Supply of claim 1; Be provided with major loop control circuit, inferior loop control circuit, drive circuit, voltage sampling circuit and power stage circuit; The output of major loop control circuit connects time loop control circuit, and the major loop control circuit also is connected with drive circuit is two-way, and inferior loop control circuit output connects drive circuit; Drive circuit output connects power stage circuit; Power stage circuit output is connected with major loop control circuit and time loop control circuit respectively through voltage sampling circuit, and power stage circuit output also connects the major loop control circuit, and it is characterized in that: the secondary loop control circuit comprises first voltage comparator and second voltage comparator; The positive input termination reference voltage of first voltage comparator; Negative input end connects the first branch road sampled voltage signal, and the anode input of second voltage comparator connects the second branch road sampled voltage signal, and the negative terminal input connects reference voltage;
A gating signal that is connected between secondary loop control circuit and the drive circuit is set produces and the selection circuit, comprise that the burst pulse that connects successively produces circuit, latch cicuit, selection circuit and shaping circuit; Wherein:
Burst pulse produces circuit and is provided with first～the 66 NAND gate, 2 resistance R 1, R2,2 capacitor C 1, C2 and first, second 2 inverters; Two inputs of first NAND gate all connect the clock signal of oscillator in the major loop control circuit and are connected with an input of second NAND gate; The output of first NAND gate connects an end of resistance R 1; The other end of resistance R 1 connects an end of capacitor C 1 and another input of second NAND gate; The other end ground connection of capacitor C 1, two inputs of the output of second NAND gate and the 3rd NAND gate link together, and the output of the 3rd NAND gate connects the input of first inverter; Two defeated duty cycle signals that all connect digital logic module output in the major loop control circuit of the 4th NAND gate; The output of the 4th NAND gate connects an end of resistance R 2; The other end of resistance R 2 connects an end of capacitor C 2 and an input of the 5th NAND gate; The other end ground connection of capacitor C 2; The duty cycle signals of digital logic module output in another input termination major loop control circuit of the 5th NAND gate, two inputs of the output of the 5th NAND gate and the 6th NAND gate link together, and the output of the 6th NAND gate connects the input of second inverter;
Latch cicuit is provided with 2 first d type flip flop and second d type flip flop and the 3rd, the 4 two inverters with asynchronous resetting function; The data input pin of the input of the 3rd inverter and second d type flip flop all connects the duty cycle signals of digital logic module output in the major loop control circuit; The input of the 4th inverter connects the output of first comparator in the secondary loop control circuit; The data input pin of first d type flip flop connects the output of the 3rd inverter; The input end of clock of first d type flip flop connects the output of second comparator in the secondary loop control circuit; The zero clearing input of first d type flip flop connects the output that burst pulse produces first inverter in the circuit; The input end of clock of second d type flip flop connects the output of the 4th inverter, and the zero clearing input of second d type flip flop connects the output that burst pulse produces second inverter in the circuit;
Select circuit to be provided with first～the 44 alternative data selector; A data input of first data selector connects the output of second d type flip flop in the latch cicuit; The in-phase clock input of first, second two data selectors all connects the duty cycle signals of digital logic module output in the major loop control circuit; The inversion clock input of first, second two data selectors all connects the output of the 3rd inverter in the latch cicuit; The equal ground connection of another data input pin of first, second two data selectors; A data input of second data selector connects the output of first d type flip flop in the latch cicuit; A data input of the 3rd data selector connects the output of first data selector; Three, the in-phase clock input of the 4 two data selector all connects the duty cycle signals of digital logic module output in the major loop control circuit; Three, the inversion clock input of the 4 two data selector all connects the output of the 3rd inverter in the latch cicuit, the equal ground connection of another data input pin of the 3rd, the 4 two data selector, and a data input of the 4th data selector connects the output of second data selector; Shaping circuit is provided with first, second two NOR gates and the 5th, the 6 two inverter; The output of the 4th data selector in the circuit is selected in an input selecting of first NOR gate; Another input of first NOR gate connects the output of selecting first data selector in the circuit; The output of first NOR gate connects the input of the 5th inverter; An input of second NOR gate connects the output of selecting the 3rd data selector in the circuit; Another input of second NOR gate connects the output of selecting second data selector in the circuit, and the input of hex inverter connects the output of second NOR gate, and the output of the 5th, the 6 two inverter produces the gating control signal of control time loop power tube switch.
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