CN101552549B - Control method and control device of buck single-inductor dual-output branch switch converter - Google Patents
Control method and control device of buck single-inductor dual-output branch switch converter Download PDFInfo
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- CN101552549B CN101552549B CN2009100952390A CN200910095239A CN101552549B CN 101552549 B CN101552549 B CN 101552549B CN 2009100952390 A CN2009100952390 A CN 2009100952390A CN 200910095239 A CN200910095239 A CN 200910095239A CN 101552549 B CN101552549 B CN 101552549B
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Abstract
The present invention discloses control method and control device of buck single-inductor dual-output switch converter. The invention provided control method can real-time regulate power ratio of a first output branch and a second output branch effectively to make output power distribution of the dual-output branch more reasonable, by regulating and controlling high level clock cycle number and low level clock cycle number in strobe signal sequence. The invention provided buck single-inductor dual-output branch switch converter implements output power dynamic distribution of the first output branch and the second output branch, and under the premise of priority satisfy load power supply, charging the battery is also assured, and total of two parts of power is controlled is a stable range, comparing with the prior art, even if power rating inputted is small can also ensure normal operation of the first output branch load.
Description
Technical field
The present invention relates to a kind of control method and control device of buck single-inductor dual output switch converters.
Background technology
Single inductance dual output switch converters has benefited from using less power element and less wiring board area occupied, is widely used in the portable electric appts.Must be equipped with accumulator in the portable decision device, be generally chargeable lithium battery; And applied environment determines when being battery charge, and equipment is also necessary can operate as normal.As in portable player, switch converters needs to produce a 4.2V direct voltage by input direct voltage and is used for charging the battery, and produces a 3.3V direct voltage simultaneously to decoding chip and other circuit.
Generally; If input power is restriction not, the component parameters of circuit is like inductance, power tube, switching frequency etc.; Can design according to the required maximum power of power circuit, therefore common single inductance dual output control strategy is enough to achieve the goal as alternately controlling.
Paper " Single-Inductor Dual-Input Dual-Output SwitchingConverter for Integrated Battery Charging and Power Regulation " discloses a kind of controller (source: Circuits and Systems of single inductance dual output; 2003.ISCAS ' 03.Proceedings of the 2003 International Symposium on; Publish day: 25-28 day in May, 2003; III-447-III-450 vol.3); Connect load at this controller one output branch road, when another output branch road connect rechargeable battery, it was metastable that controller provides the time of output to the two-way branch road; Generally be to every road output branch road output to be provided successively, respectively account for half the on the time.Because the output time that provides to every road branch road is stable; In charging process; The energy that offers the battery branch road can reduce with the rising of cell voltage; And the energy consumption of load changes at any time, so sort controller must consider extreme case, promptly transports to all maximum situation of energy of load and battery.With the foundation of all maximum situation of the energy of transporting to load and battery as the design transformation device; Such shortcoming is when cell voltage rises; The energy of transporting to battery reduces; Converter still keeps the half the time and charges the battery, and no current in the actual this moment inductance, the most of the time is wasted.
Along with the lifting of photovoltaic conversion efficiency, increasing portable set begins to select solar cell as power supply unit.If still design according to the required maximum power of circuit, the solar cell board size that meets the requirements may exceed basic portable requirement; And the variation of intensity of illumination, also can increase the uncertainty of design.
Summary of the invention
The invention provides a kind of control method of buck single-inductor dual output switch converters, according to the power output ratio of loading condition through control gating signal adjustment rationally two output branch roads.
The present invention also provides a kind of buck single-inductor dual output switch converters of realizing said method, realizes the power output ratio of adjustment two output branch roads through negative-feedback circuit and finite state machine.
The control method of buck single-inductor dual-output branch switch converter of the present invention is:
Send the control gating signal to two output branch roads, described control gating signal comprises a plurality of sequences, and each sequence was made up of high level clock cycle more than 1 and the low level clock cycle more than 1;
Sample the respectively output voltage of two output branch roads and relatively produce first negative-feedback signal and second negative-feedback signal with reference voltage is selected first negative-feedback signal or second negative-feedback signal to compare with the triangle wave voltage signal and is produced the drive signal that is used to adjust inductance input power;
Detect the electric current of inductance simultaneously; When inductive current is not making zero or in week in the end of term when the time that electric current is arranged in the inductance is shorter than 0.7 times of cycle; The clock periodicity and the low level clock periodicity of high level in the adjustment sequence, the power output ratio of two output branch roads of change.
High level corresponding selection first negative-feedback signal or second negative-feedback signal in the above-mentioned control gating signal are compared with the triangle wave voltage signal, and another negative-feedback signal of low level corresponding selection is compared with the triangle wave voltage signal.
High level in the above-mentioned control gating signal is controlled the conducting and second of the first output branch road and is exported ending of branch road, and the conducting of exporting branch road with second that ends of branch road is exported in low level control first.
When inductive current did not make zero in clock cycle end, each sequence increases by the high level of 1 clock cycle or reduces the low level of 1 clock cycle in the control gating signal; In inductance, have time of electric current to be shorter than 0.7 times of cycle, each sequence reduces the high level of 1 clock cycle or increases by the low level of 1 clock cycle in the control gating signal.
For the ease of control,, the low level clock periodicity M that controls each sequence in the gating signal is stabilized to 1 as preferred embodiment.When inductive current did not make zero in clock cycle end, control the high level of each sequence 1 clock cycle of increase in the gating signal; In inductance, have time of electric current to be shorter than 0.7 times of cycle, each sequence reduces the high level of 1 clock cycle in the control gating signal, and the clock periodicity of high level is 1 in each sequence.
Because sequence signal may cause the instability that converter is temporary transient after changing once, thereby makes detection signal inaccurate, stablize several cycles so can after the control gating signal changes, keep.
Excessive for the peak current that prevents the second output branch road, the peak current of the second output branch road is carried out electric current restriction.
Excessive for the peak current that prevents the second output branch road, in the time of can being chosen in the control gating signal conducting second output branch road, the peak current of inductance is limited.
A kind of switch converters of realizing above-mentioned control method, comprise the first field effect transistor switch pipe and the inductance that is connected the first field effect transistor switch pipe, connect this inductance output end the first output branch road of forming by the second field effect transistor switch pipe, connect inductance output end second export branch road by what the 3rd field effect transistor switch pipe was formed; The first output branch road and the second output branch road are provided with feedback circuit, and feedback circuit is sampled to the output voltage of the first output branch road and the second output branch road respectively;
Comprise that also a current detection module connects inductance one end, the detection signal and the clock signal of finite state machine received current detection module, output control gating signal;
The grid of the second field effect transistor switch pipe and the 3rd field effect transistor switch pipe receives the control gating signal of the power output ratio that is used to adjust the first output branch road and second branch road through anti-crossover driver;
Be provided with the gate of selecting the output first output branch road negative-feedback signal or the second output branch road negative-feedback signal according to the control gating signal in the feedback circuit;
One comparator receives the negative-feedback signal and the triangle wave voltage signal of gate, and output drive signal;
The grid of the first field effect transistor switch pipe receives drive signal through driver, adjusts the power output of the first field effect transistor switch pipe.
For peak current is limited, be connected with the peak current limit module that is used to export the branch road current limliting at voltage input end, described driver receives the signal of peak current limit module and the control gating signal of finite state machine.
Advantage of the present invention is:
Control method of the present invention is through high level clock periodicity and low level clock periodicity in the adjustment control gating signal sequence; But adjust to high-efficiency real-time the power ratio of the first output branch road and the second output branch road, make the power output distribution of two output branch roads more reasonable.
Buck single-inductor dual output switch converters of the present invention is to the power output dynamic assignment of the first output branch road and the second output branch road; Make under the prerequisite that preferentially satisfies electric; Still can guarantee battery charge, and the summation of this two-part power can be controlled in the more stable scope, compares prior art; Even input rated power is less, also can satisfy the operate as normal of the first output branch road load.
Description of drawings
Fig. 1 is the view of finite state machine of the present invention;
Fig. 2 is the circuit diagram of control device of the present invention;
Fig. 3 is the circuit diagram of anti-crossover driver of the present invention;
Fig. 4 is the circuit diagram of driver of the present invention;
Fig. 5 a is the current diagram of the first output branch road;
Fig. 5 b is the current diagram of input branch road inductance;
Fig. 5 c is a control gating signal sketch map.
Embodiment
Single inductance dual output switch converters of present embodiment is applied to the power circuit in the portable equipment; Comprise the first field effect transistor switch pipe 1 and the inductance that is connected the first field effect transistor switch pipe 12, connect these inductance 2 outputs the first output branch road of forming by the second field effect transistor switch pipe 3, connect this inductance output end second export branch road by what the 3rd field effect transistor switch pipe 4 was formed; Wherein the second output branch road is a charging circuit, and output connects rechargeable battery.The first output branch road and the second output branch road are provided with feedback circuit; Feedback circuit is sampled to the output voltage of the first output branch road and the second output branch road respectively, and sampled voltage and reference voltage 8 are produced first negative-feedback signal and second negative-feedback signal more respectively.At the input of switch converters and the output cross-over connection of the second output branch road rechargeable battery powered branch road is arranged.After outside input power supply was removed, detection of power loss module automatic switchover rechargeable battery continued as the first output branch road power supply as the input power supply, closes the second output branch road simultaneously.
The control method of present embodiment is:
When initial, send the control gating signal to two output branch roads, described control gating signal comprises a plurality of sequences, and each sequence is made up of high level and the low level of 1 clock cycle of 1 clock cycle.High level in the control gating signal is controlled the conducting and second of the first output branch road and is exported ending of branch road, and low level is controlled the conducting of exporting branch road with second that ends of the first output branch road.
Sample the respectively output voltage of two output branch roads and relatively produce first negative-feedback signal and second negative-feedback signal with reference voltage.High level through the control gating signal selects first negative-feedback signal to compare with the triangle wave voltage signal, and low level corresponding selection second negative-feedback signal is compared with the triangle wave voltage signal.Relatively the back produces drive signal, the power of adjustment inductance input.
Detect the electric current of inductance simultaneously,, control the high level of each sequence 1 clock cycle of increase in the gating signal when inductive current did not make zero in clock cycle end; In inductance, have time of electric current to be shorter than 0.7 times of cycle, each sequence reduces the high level of 1 clock cycle in the control gating signal, and the clock periodicity of high level is 1 in each sequence.
Because sequence signal may cause the instability that converter is temporary transient after changing once, thereby makes detection signal inaccurate,, the detection signal that foundation is new again behind the system stability is changed so after sequence signal changes once, just wait for several cycles.Usually change the back at sequence signal and wait for 16 cycles.
Each state of the finite state machine of generation control gating signal as shown in Figure 1.The detection signal and the clock signal of finite state machine receiving inductance current detection module, output control gating signal.Finite state machine has one of four states:
State 1: output control gating signal, control gating signal comprise the high level of one or more clock cycle and the sequence that the low level of 1 clock cycle is formed;
State 2: each sequence increases by the high level of 1 clock cycle in the control gating signal;
State 3: each sequence reduces the high level of 1 clock cycle in the control gating signal;
State 4: shielding " UP " signal and 16 clock cycle of " DOWN " signal, waiting system is stable.
When the control gating signal does not satisfy the change condition, the control gating signal of circulation output state 1.After limited state machine receives reset signal, can the high level in each sequence be adjusted into 1 clock periodicity.
When inductive current did not make zero in clock cycle end, finite state machine receives " UP " signal, gets the hang of 2 from state 1, and each sequence increases by the high level of 1 clock cycle in the control gating signal.Get the hang of 4 then, after the control gating signal is stablized 16 clock cycle, get the hang of 1.
When the time that electric current is arranged in the inductance is shorter than 0.7 times of cycle; Finite state machine receives " DOWN " signal; More than 1, get the hang of 3 from state 1 like the clock periodicity of high level in the infructescence, each sequence reduces the high level of 1 clock cycle in the control gating signal.Get the hang of 4 then, the control gating signal is stablized 16 all after dates, gets the hang of 1.
The load of the second output branch road is generally lithium ion battery.By the battery behavior decision, under the store electrical energy condition of different, its voltage can change between 2.7-4.2V.If directly use constant voltage charge, when cell voltage was low, charging current can be excessive, gently then damages battery, heavy then initiation potential; So during to the second output branch road output, inductive current is done peak-limitation.Like this when cell voltage is low, converter produces the charging current of an approximately constant (concrete size according to peak limit value and sequence signal different and decide) at the second output branch road, avoids large current charge.
The control device of present embodiment as shown in Figure 2 comprises above-mentioned single inductance dual output switch converters.Current detection module is connected inductance 2 one ends, detects inductive current, and detection signal is sent to finite state machine.Do not get back to zero current condition at all end of term inductive currents, this current detection module output " UP " signal, the expression converter has broken away from discontinuous current pattern (DCM), gets into continuous current mode (CCM); If this module detects the time that electric current is arranged in the inductance and is shorter than 0.7 times of cycle, output " DOWN " signal shows that load has become lighter.
The grid of the second field effect transistor switch pipe 3 and the 3rd field effect transistor switch pipe 4 receives the control gating signal of the power output ratio that is used to adjust the first output branch road and second branch road through anti-crossover driver.The electrical block diagram of anti-crossover driver as shown in Figure 3 is after the input of control gating signal, through NAND gate 15 and the grid output of time-delay door 16 backs to the second field effect transistor switch pipe 3 and the 3rd field effect transistor switch pipe 4.
Be provided with the gate 5 that is used to select to export the first output branch road negative-feedback signal or the second output branch road negative-feedback signal in the feedback circuit, this gate 5 receives the control gating signal and selects the corresponding negative-feedback signal of output.Negative-feedback signal and triangle wave voltage signal that comparator 6 receives through gate 5 outputs, and output drive signal.The grid of the first field effect transistor switch pipe 1 is adjusted the first field effect transistor switch pipe, 1 power output through the drive signal of driver reception comparator.
Connect the peak current limit module that is used for the second output branch road current limliting at voltage input end 7; Above-mentioned driver receives the signal of peak current limit module and the control gating signal of finite state machine; When the 3rd field effect transistor switch pipe conducting second output branch road, the electric current of inductance 2 is carried out peak-limitation.
Driver circuit structure sketch map as shown in Figure 4, two inputs of driver 14 receive the signal of peak current limit module and the control gating signal 10 of finite state machine with door 9.The control gating signal 10 of finite state machine also can shield the signal of peak current limit module when the conducting first output branch road.Two inputs or door receive the output signal and the drive signal of comparator 6 of two inputs and door 9, and two inputs or door 11 are to RS latch 12 transmission signals.RS latch 12 connects the grid of the first field effect transistor switch pipe 1 through three buffers 13.
Shown in Figure 5 is load rising step response sketch map.Wherein, Fig. 5 a is the first output branch current sketch map; Fig. 5 b is the inductive current sketch map; Fig. 5 c is control gating signal sketch map.
Before time shaft 1.1ms, circuit working is alternately exported electric energy in underload from the sequence signal control first output branch road and the second output branch road.
At the 1.1ms place, the electric current of the first output branch road is elevated to 180mA from 30mA, because this moment, interrupted inductive current was not enough to offer the enough electric energy of load A, controlled by loop, and inductive current will get into continuous mode so that more electric energy to be provided; And this can cause the intermodulation between the two output voltage.For avoiding this situation, the high level number increases in the control gating signal sequence.
After the control gating signal changed at every turn, finite state machine was through shielding " UP " or " DOWN " signal in 16 cycles, and the wait converter is stable.Avoid sequence control gating signal to change once more too early, cause that entire system is unstable.
Claims (9)
1. the control method of a buck single-inductor dual-output branch switch converter is controlled the output of two output branch roads through controlling gating signal, it is characterized in that:
Described control gating signal comprises a plurality of sequences, and each sequence was made up of high level clock cycle more than 1 and the low level clock cycle more than 1;
Sample the respectively output voltage of two output branch roads and relatively produce first negative-feedback signal and second negative-feedback signal with reference voltage is selected first negative-feedback signal or second negative-feedback signal to compare with the triangle wave voltage signal and is produced the drive signal that is used to adjust inductance input power;
Detect the electric current of inductance in the input branch road simultaneously; When inductive current is not making zero or in week in the end of term when the time that electric current is arranged in the inductance is shorter than 0.7 times of cycle; The clock periodicity and the low level clock periodicity of high level in the adjustment control gating signal sequence, the power output ratio of two output branch roads of change;
High level corresponding selection first negative-feedback signal or second negative-feedback signal in the described control gating signal are compared with the triangle wave voltage signal, and another negative-feedback signal of low level corresponding selection is compared with the triangle wave voltage signal.
2. control method according to claim 1 is characterized in that: high level is controlled first and is exported the conducting of branch road and ending of the second output branch road in the said control gating signal, and the conducting of the ending of branch road and the second output branch road is exported in low level control first.
3. control method according to claim 1 is characterized in that: when inductive current did not make zero in clock cycle end, each sequence increases by the high level of 1 clock cycle or reduces the low level of 1 clock cycle in the control gating signal; In inductance, have time of electric current to be shorter than 0.7 times of cycle, each sequence reduces the high level of 1 clock cycle or increases by the low level of 1 clock cycle in the control gating signal.
4. control method according to claim 3 is characterized in that: the low level clock periodicity of each sequence stabilizes to 1 in the said control gating signal.
5. according to the arbitrary described control method of claim 1-4, it is characterized in that: keep after described control gating signal changes and stablize constant several clock cycle.
6. control method according to claim 5 is characterized in that: the peak current to the second output branch road carries out the electric current restriction.
7. control method according to claim 5 is characterized in that: when the control gating signal conducting second output branch road, the peak current of inductance is limited.
8. switch converters of realizing the said control method of claim 1, comprise the first field effect transistor switch pipe and the inductance that is connected the first field effect transistor switch pipe, connect this inductance output end the first output branch road of forming by the second field effect transistor switch pipe, connect inductance output end second export branch road by what the 3rd field effect transistor switch pipe was formed; The first output branch road and the second output branch road are provided with feedback circuit, and feedback circuit to the output voltage sampling of the first output branch road and the second output branch road, is characterized in that respectively:
One current detection module connects inductance one end, the detection signal and the clock signal of finite state machine received current detection module, output control gating signal;
The grid of the second field effect transistor switch pipe and the 3rd field effect transistor switch pipe receives the control gating signal of the power output ratio that is used to adjust the first output branch road and second branch road through anti-crossover driver;
Be provided with the gate of selecting the output first output branch road negative-feedback signal or the second output branch road negative-feedback signal according to the control gating signal in the feedback circuit;
One comparator receives the negative-feedback signal and the triangle wave voltage signal of gate, and output drive signal;
The grid of the first field effect transistor switch pipe receives drive signal through driver, adjusts the power output of the first field effect transistor switch pipe.
9. switch converters according to claim 8; It is characterized in that: be connected with the peak current limit module that is used to export the branch road current limliting at voltage input end, described driver receives the signal of peak current limit module and the control gating signal of finite state machine.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8947059B2 (en) * | 2010-09-10 | 2015-02-03 | St-Ericsson Sa | Symmetrical output switch-mode power supply |
| CN102710127B (en) * | 2011-01-11 | 2015-05-20 | 瑞昱半导体股份有限公司 | Single-inductance double-output power converter and driving method thereof |
| TWI514738B (en) | 2011-07-07 | 2015-12-21 | Sitronix Technology Corp | Voltage converter |
| JP5866920B2 (en) * | 2011-09-22 | 2016-02-24 | セイコーエプソン株式会社 | Switching device and control method thereof |
| CN104660033B (en) * | 2015-02-10 | 2017-03-01 | 西南交通大学 | Continuous conduction mode single-inductance double-output switch converters method for controlling frequency conversion and its device |
| CN106374745B (en) * | 2016-09-21 | 2019-05-17 | 西安电子科技大学 | The single inductance doubleway output DC-DC boost converter inhibited based on voltage intermodulation |
| JP6757697B2 (en) * | 2017-04-28 | 2020-09-23 | 株式会社日立製作所 | Control controller and control method |
| CN108988626A (en) * | 2018-07-11 | 2018-12-11 | 南京理工大学 | A kind of single-inductor dual-output converter and its working method merging PFC |
| CN111106758B (en) * | 2018-10-26 | 2021-03-30 | 立锜科技股份有限公司 | Power supply device, master power supply circuit, slave power supply circuit and control method thereof |
| CN109660124B (en) * | 2019-01-21 | 2019-07-26 | 华南理工大学 | A kind of single-inductance double-output lifting/voltage reducing DC-DC converter of hysteresis current control |
| TWI765419B (en) * | 2020-11-19 | 2022-05-21 | 國立中山大學 | Single inductor dual output buck converter |
| CN115633394B (en) * | 2022-02-23 | 2023-09-05 | 荣耀终端有限公司 | Power control method and related equipment |
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