CN102355131A - Hybrid control method and device of four-switch Buck-Boost converter - Google Patents
Hybrid control method and device of four-switch Buck-Boost converter Download PDFInfo
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- CN102355131A CN102355131A CN2011103112109A CN201110311210A CN102355131A CN 102355131 A CN102355131 A CN 102355131A CN 2011103112109 A CN2011103112109 A CN 2011103112109A CN 201110311210 A CN201110311210 A CN 201110311210A CN 102355131 A CN102355131 A CN 102355131A
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Abstract
The invention discloses a hybrid control method and device of a four-switch Buck-Boost converter. The hybrid control method comprises a digital control mode and an analog control mode and comprises the following steps of: respectively obtaining a digital control signal and an analog control signal according to an output voltage error signal in the working process; then generating a hybrid control signal according to the analog control signal and the digital control signal; when the load at the output end of the converter does not jump, adopting the hybrid control signal to control the switch motions of switch tubes in the converter so as to keep the output voltage at a constant value; and when the load at the output end of the converter jumps, adopting the hybrid control signal to control the switch motions of the switch tubes in the converter so as to rapidly restore the output voltage to the constant value. The hybrid control method and device have the characteristics of simple control scheme, high dynamic response speed and high steady state accuracy.
Description
Technical field
The invention belongs to electric and electronic technical field, what be specifically related to is a kind of mixing control method and device of four switch Buck-Boost converters.
Background technology
Four switch Buck-boost converters also become the focus of current research because its input and output homophase, switching loss are low, but output voltage can rise the degradation advantage and all receive people's attention always to the Optimal Control Strategy of its circuit.At present; Controlling schemes to sort circuit in the domestic research is mainly analog control mode; Wherein analog control mode comprises two kinds of voltage mode and current-modes again: voltage mode is fairly simple; Mainly comprise an error amplifier and logical circuit; Error amplifier two inputs receive an output voltage sampled signal and a reference signal respectively; The signal of its output and a sawtooth signal are relatively; Produce switch controlling signal through logical circuit then; But sort circuit need increase complicated compensating circuit, and dynamic response is very slow; Current-mode then is widely used relatively; It mainly comprises error amplifier and current comparator; Error amplifier receives an output voltage sampled signal and a reference signal; The signal of its output is as the benchmark input of current comparator; The other end input inductance current signal of current comparator; Through relatively generation one switch controlling signal of current comparator, this mode changes output voltage through changing input current, and its dynamic responding speed is still slower.Domestic also have some researchs on based on current-mode; Like the patent No.: 200910095890.8 disclose a kind of through current-mode and non-linear four switch dc-dc converters that combine; It improves dynamic responding speed through methods such as a plurality of comparators and design compensation circuit; But its control procedure is very complicated; The peripheral circuit components and parts are various, and circuit loss is bigger.
Abroad the digital control strategy to four switch Buck-boost converters has carried out some researchs; Realize the fast dynamic response of circuit as having introduced the digital control approach that combines through linear loop circuit and non-linear loop circuit in the document " A Dual-loop Digital Controller for Switching DC-DC Converters "; When the output load generation saltus step of converter, non-linear loop can quick adjustment converter work duty ratio and make output voltage quickly recover to stationary value.But the situation when this pure digi-tal control mode weak point is not take into account the circuit stable state; Because there is the problem of quantified precision in digital control circuit; System also little disturbance may occur during stable state; Do not reach the thresholding of digital quantization like the amplitude of disturbance; Numerical control system will not produce action this moment, keep constant to such an extent as to can't guarantee output voltage.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; A kind of mixing control method and device of four switch Buck-Boost converters are provided; Said mixing control method comprises digital control approach and analog control mode; And produce a digital controlled signal and an analog control signal respectively according to the output voltage error signal; Then both stacks are obtained one and mix control signal; Under the stable state; The switch motion of switching tube is a steady state value to keep output voltage in the said mixing control signal energy control change device; When load generation saltus step, the switch motion of switching tube is so that the converter output voltage quickly recovers to steady state value in the said mixing control signal energy control change device.It is the transient changing of response transform device fast not only, improves the stable state accuracy, and circuit control is simple.
Mixing control method according to a kind of four switch Buck-Boost converters of the present invention comprises:
Detect the output voltage of the output of said converter;
According to a said output voltage and a reference voltage, produce an output voltage error signal;
According to said output voltage error signal, produce an analog control signal and a digital controlled signal respectively;
According to said analog control signal and said digital controlled signal, produce one and mix control signal;
When said converter output terminal load saltus step did not take place, said mixing control signal was controlled the switch motion of switching tube in the said converter, was a steady state value to keep said output voltage;
When said converter output terminal load generation saltus step, said mixing control signal is controlled the switch motion of switching tube in the said converter, so that said output voltage returns to said steady state value fast.
Further, the mixing control method of described four switch Buck-Boost converters also comprises:
According to said output voltage error signal, produce first digital controlled signal and second digital controlled signal respectively;
Detect the input voltage of the input of said converter;
When said input voltage during, select said first digital controlled signal as said digital controlled signal, to produce the said control signal of mixing with said analog control signal greater than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Buck pattern;
When said input voltage during, select said second digital controlled signal as said digital controlled signal, to produce the said control signal of mixing with said analog control signal less than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Boost pattern.
Further, the mixing control method of described four switch Buck-Boost converters also comprises:
Detect the input voltage of the input of said converter;
When said input voltage during,, produce first digital controlled signal with as said digital controlled signal, to produce the said control signal of mixing with said analog control signal according to said output voltage error signal greater than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Buck pattern;
When said input voltage during,, produce second digital controlled signal with as said digital controlled signal, to produce the said control signal of mixing with said analog control signal according to said output voltage error signal less than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Boost pattern.
Preferably, adopt PID control to produce said first digital controlled signal; Adopt the 2nd PID control to produce said second digital controlled signal.
Preferably; In preset input voltage range; The gain parameter of controlling said PID control is followed the variation of said input voltage; So that said converter is when carrying out the switching of Buck and Boost mode of operation, the gain parameter of said PID control equates with the gain parameter of the 2nd PID control.
According to a kind of mixed control apparatus of realizing the mixing control method of four switch Buck-Boost converters of the present invention, said mixed control apparatus comprises output voltage feedback circuit, digital control loop, analog control loop and an add circuit; Wherein,
Said output voltage feedback circuit is connected with the output of said Buck-Boost converter, in order to receiving the output voltage of said converter, and carries out the error computing to produce an output voltage error signal with a reference voltage;
Said digital control loop is connected with said output voltage feedback circuit, receives said output voltage error signal and produces a digital controlled signal;
Said analog control loop is connected with said output voltage feedback circuit, receives said output voltage error signal and produces an analog control signal;
Said add circuit is connected with said analog control loop with said digital control loop, in order to receiving said digital controlled signal and said analog control signal, and both additions are obtained one mixes control signal;
When said converter output terminal load saltus step did not take place, said mixing control signal was controlled the switch motion of switching tube in the said converter, was a steady state value to keep said output voltage;
When said converter output terminal load generation saltus step, said mixing control signal is controlled the switch motion of switching tube in the said converter, so that said output voltage returns to said steady state value fast.
Further, said output voltage feedback circuit comprises an error amplifier, and said output voltage and said reference voltage that it will receive carry out the error computing, and exports said output voltage error signal.
Further, said digital control loop comprises an ADC change-over circuit, bimodulus selection circuit, Buck digital control circuit, Boost digital control circuit and DAC change-over circuit,
Said ADC change-over circuit receives the output voltage error signal of said output voltage feedback circuit, and is translated into corresponding with it digital signal;
The input of said Buck digital control circuit input and Boost digital control circuit all is connected with said ADC change-over circuit; Convert the output voltage error signal of numeral in order to reception, and produce first digital controlled signal and second digital controlled signal in view of the above respectively;
Said bimodulus selects circuit to receive the input voltage of the input of said converter;
When said input voltage during greater than said output voltage, said Buck digital control circuit output is connected to said DAC change-over circuit, to select said first digital controlled signal as said digital controlled signal;
When said input voltage during less than said output voltage, said Boost digital control circuit output is connected to said DAC change-over circuit, to select said second digital controlled signal as said digital controlled signal;
Said DAC change-over circuit receives said digital controlled signal, and is converted into corresponding simulating signal with it, with the analog control signal addition that realizes producing with analog control loop.
Further, said digital control loop comprises an ADC change-over circuit, bimodulus selection circuit, Buck digital control circuit, Boost digital control circuit and DAC change-over circuit,
Said ADC change-over circuit receives the output voltage error signal of said output voltage feedback circuit, and is translated into corresponding with it digital signal;
Said bimodulus selects circuit to receive the input voltage of the input of said converter;
When said input voltage during greater than said output voltage, said Buck digital control circuit receives said output voltage error signal, produces first digital controlled signal with as said digital controlled signal;
When said input voltage during less than said output voltage, said Boost digital control circuit receives said output voltage error signal, produces second digital controlled signal with as said digital controlled signal;
Said DAC change-over circuit; All be connected with the output of said Buck digital control circuit and said Boost digital control circuit; Receive said digital controlled signal, and be converted into corresponding simulating signal with it, with the analog control signal addition that realizes producing with analog control loop.
Preferably, said Buck digital control circuit adopts PID control, to produce first digital controlled signal; Said Boost digital control circuit adopts the 2nd PID control, to produce second digital controlled signal.
Further; Said digital control loop further comprises the PID gain control circuit; Said PID gain control circuit input receives input voltage signal; Output is connected with said Buck digital control circuit; In preset input voltage range; The gain parameter of controlling said PID control is followed the variation of said input voltage; So that said converter is when carrying out the switching of Buck and Boost mode of operation, the gain parameter of the gain parameter of said PID control and the 2nd PID control equates.
Further; Said mixed control apparatus also comprises switch control signal generating circuit; Said switch control signal generating circuit is connected with said add circuit, receives said mixing control signal and produces the four-way switch control signal respectively in order to control the switch motion of switching tube in the said converter.
The present invention controls through simulation and digital control coefficient method has solved the dynamic response problem of four switch Buck-Boost converters when the load saltus step; The response speed of raising system; The recovery time of output voltage is fast; Simultaneously; Also guarantee when stable state; Can both detect control even if small sample perturbations appears in system, improve the stable state accuracy of system.In addition; The present invention carries out the switching of system works pattern through the variation of monitoring input voltage; And control PID gain parameter is along with input voltage changes; Can be so that in the process that circuit working state switches; Output voltage is constant basically, has reduced the output voltage fluctuation, and system only is operated in Buck pattern or Boost pattern; There is not the Buck-Boost pattern, reduced the conducting and the drive loss of switch.It is simple that mixed control apparatus of the present invention has control, and response speed is fast, characteristics such as stable state accuracy height.
Description of drawings
Shown in Figure 1 is the circuit block diagram of mixed control apparatus one preferred embodiment of foundation four switch Buck-Boost converters of the present invention.
Shown in Figure 2 is the working waveform figure of foundation circuit shown in Figure 1.
Shown in Figure 3 for switch the sketch map of a preferred embodiment according to Buck of the present invention and Boost mode of operation.
Shown in Figure 4 is the circuit block diagram of another preferred embodiment of mixed control apparatus of foundation four switch Buck-Boost converters of the present invention.
Shown in Figure 5 be according to mixing control method one preferred embodiment of four switch Buck-Boost converters of the present invention flow chart.
Embodiment
Below in conjunction with accompanying drawing several preferred embodiments of the present invention is described in detail, but the present invention is not restricted to these embodiment.The present invention contain any on marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.Understand for the public is had completely the present invention, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention fully for a person skilled in the art.
With reference to figure 1; Be depicted as circuit block diagram according to mixed control apparatus one preferred embodiment of four switch Buck-Boost converters of the present invention; Four switch Buck-Boost converters comprise four switch Buck-Boost topological sum mixed control apparatus; Wherein, Four switch Buck-Boost topologys comprise switching tube S1; Switching tube S2; Switching tube S3; Switching tube S4; Inductance L 1; Input capacitance Cin and output capacitance Cout; Mixed control apparatus described in the present invention comprises digital control loop 11; Analog control loop 12; Output voltage feedback circuit 13; Add circuit 14 and switch control signal generating circuit 15, wherein, said digital control loop 11 comprises an ADC change-over circuit 111; Bimodulus is selected circuit 112; Buck digital control circuit 113; Boost digital control circuit 114 and DAC change-over circuit 115.
Said output voltage feedback circuit 13 is connected with the output of said Buck-Boost converter, in order to receiving the output voltage of said Buck-Boost converter, and carries out the error computing to export an output voltage error signal with a reference voltage.Here, said output voltage feedback circuit 13 specifically comprises an error amplifier, and under the stable situation, said reference voltage equates with said output voltage; When load generation saltus step, output voltage meeting transition rising or transition descend, and this moment, the output voltage error signal value will become big.Those skilled in the art can know other technologies or element such as subtracter, comparator etc. by inference in view of the above as long as can realize the feedback of output voltage all can be applicable to the output voltage feedback circuit in the present embodiment.
The output voltage error signal that said ADC change-over circuit 111 receives said output voltage feedback circuit 13, and be translated into corresponding with it digital signal.
The input of said Buck digital control circuit 113 inputs and Boost digital control circuit 114 all is connected with said ADC change-over circuit 111; Convert the output voltage error signal of numeral in order to reception, and produce first digital controlled signal and second digital controlled signal respectively.Here, said Buck digital control circuit 113 adopts PID control, and said Boost digital control circuit adopts the 2nd PID control, to obtain above-mentioned first digital controlled signal and second digital controlled signal.
The input voltage that said bimodulus selects circuit 112 to receive the input of said converter; And judge that according to the size variation of input voltage said converter works in Buck or Boost mode of operation, selects to connect said Buck digital control circuit 113 or Boost digital control circuit 114 with this.Be specially: when said input voltage during greater than said output voltage; Converter is operated in the Buck pattern; Connect said Buck digital control circuit 113 this moment; Be about to said Buck digital control circuit 113 outputs and be connected to said DAC change-over circuit 111, to select said first digital controlled signal as said digital controlled signal; When said input voltage during less than said output voltage; Converter is operated in the Boost pattern; Connect said Boost digital control circuit 114 this moment; Be about to said Boost digital control circuit 114 outputs and be connected to said DAC change-over circuit 111, to select said second digital controlled signal as said digital controlled signal.
Said DAC change-over circuit 115 receives above-mentioned digital controlled signal, and is converted into corresponding simulating signal with it, with the analog control signal addition that realizes producing with analog control loop.
Said add circuit 14 is connected with said analog control loop with said digital control loop, in order to receiving said digital controlled signal and said analog control signal, and both additions are obtained one mixes control signal; Said switch control signal generating circuit 15 is connected with said add circuit 14, receives said mixing control signal and produces the four-way switch control signal respectively in order to control the switch motion of four switching tubes in the said converter.
When said converter output terminal load saltus step did not take place, said mixing control signal was controlled the switch motion of switching tube in the said converter, was a steady state value to keep said output voltage.In the steady operation process; As big disturbance occurring; Digital control loop 11 can detect the output voltage error signal simultaneously with analog control loop 12; Produce digital controlled signal and analog control signal respectively; And mix through add circuit 14 and to obtain mixing control signal and come the action of control switch pipe, to regulate output voltage stabilization at steady state value; As when small sample perturbations occurring; Analog control loop 12 can detect this small output voltage error signal; And come disturbance suppression through analog control loop 12; Guarantee that said converter output is constant; This moment is owing to the reason of digital ADC transducer quantified precision; If the amplitude of disturbance possibly not reach the thresholding that ADC quantizes, digital control loop 11 parts will not produce action.Therefore, when steady-state process, the play a major role switch motion of control switch pipe of the analog control signal that produces by analog control circuit, it is constant to keep output voltage, improves the stable state accuracy.
When said converter output terminal load generation saltus step, said mixing control signal is controlled the switch motion of switching tube in the said converter, so that said output voltage returns to said steady state value fast.As judge that current converter is operated in the Buck pattern, and switching tube S4 is often open-minded, and switching tube S3 often turn-offs, and realizes step-down control by switching tube S1 and switching tube S2 alternation switch.When load is downloaded to heavily loaded saltus step on the lenient side; Output voltage can descend in transition; The output voltage error signal of error amplifier 131 outputs this moment becomes big; Buck digital control circuit 113 in the digital control circuit 11 carries out the regulating and controlling effect after detecting the output voltage error signal; The duty ratio of control switch pipe S1 increases fast, output voltage can be risen rapidly and reaches stationary value.In like manner, when load during from heavy duty to the underloading saltus step, output voltage can rise in transition, and the duty ratio of Buck digital control circuit 113 control switch pipe S1 reduces fast, output voltage can be descended rapidly and reaches stationary value.
As judge current circuit working under the Boost pattern, and switching tube S1 is often open-minded, and switching tube S3 often turn-offs, and realizes boosting control by switching tube S3 and switching tube S4 alternation switch.When load is downloaded to heavily loaded saltus step on the lenient side; Output voltage can descend in transition; The output voltage error signal of error amplifier 131 outputs becomes big; Boost digital control circuit 114 in the digital control circuit 11 carries out the regulating and controlling effect after detecting the output voltage error signal; The duty ratio of control switch pipe S3 increases, and output voltage is risen rapidly reach stationary value.In like manner, when load during from heavy duty to the underloading saltus step, output voltage can rise in transition, and the duty ratio of Boost digital control circuit 114 control switch pipe S3 reduces, and output voltage is descended rapidly reach stationary value.
When load generation saltus step; Analog control loop also receives said output voltage error signal simultaneously; Produce the duty ratio of an analog control signal in order to the by-pass cock pipe; But in this process; Because the speed of digital controlled signal response is much faster than the speed of analog control signal response; Therefore in this process; The play a major role switch motion of control switch pipe of the digital controlled signal that produces by digital control circuit; Thereby also realized quick response, made output voltage return to steady state value fast transient changing.
With reference to shown in Figure 2; Fig. 2 is the working waveform figure according to circuit shown in Figure 1; From Fig. 2 a, can find out; When the heavy duty sudden change takes place to be downloaded on the lenient side in load; It is bigger that the variation (dotted line among Fig. 2 a) of mixing control signal Vcomp in the mixing controlling schemes changes (solid line among Fig. 2 a) when controlling than simple simulation; The speed of its by-pass cock pipe duty ratio also can be faster accordingly like this, so can regulate output voltage values quickly.Therefore, can learn from Fig. 2 b that adopt mixing controlling schemes output voltage recovery time (t2-t1) also will lack much recovery time than simple simulation control (t3-t1) output voltage, promptly dynamic response is fast.
Further; Said digital control loop 11 also comprises PID gain control circuit 116; Said PID gain control circuit 116 inputs receive input voltage; Output is connected with said Buck digital control circuit 113; In preset input voltage range; The gain parameter of the said PID control of PID gain control circuit 116 controls is followed the variation of said input voltage; So that said converter is when carrying out the switching of Buck and Boost mode of operation, the gain parameter of the gain parameter of said PID control and the 2nd PID control equates.Can guarantee converter like this in carrying out Buck and Boost work-mode switching process, the output voltage fluctuation is little.Concrete PID gain parameter for said PID gain control circuit 116 control Buck digital control circuits 113 is along with input voltage (rising) descend (rising) that descend in the present embodiment; To regulate the gain parameter of PID control, make the gain parameter of PID control when the converter mode of operation is switched equate with the gain parameter of the 2nd PID control.
With reference to figure 3; Be depicted as the sketch map that switches a preferred embodiment according to Buck of the present invention and Boost mode of operation; Its concrete course of work is: the PID gain of PID gain control circuit 116 control Buck digital control circuits 113 is along with the decline of input voltage descends; During greater than V1, converter is operated in the Buck pattern in input voltage vin; When Vin ≤V1 and Vin >=V2, the gain parameter G of Buck PID control circuit descends and descends along with Vin, and this moment, said converter still was operated in the Buck pattern; When input voltage vin drops to V2; Bimodulus selects circuit 112 control change devices to get into the Boost mode of operation; And the PID gain parameter of said PID gain control circuit 116 control Buck digital control circuits dropped to the PID gain parameter of Boost digital control circuit and equated this moment; After this; When input voltage vin during less than V2, said converter still is operated in the Boost pattern.Equate that in gain place's control switching makes that the transition of converter from the Buck pattern to the Boost pattern is very mild, therefore can guarantee output voltage stabilization, output voltage can not occur than great fluctuation process.And; Kong Zhi Buck-Boost converter only is operated in Buck state or Boost state in this way; There is not the Buck-Boost state; Promptly in each switch periods, have only two switching tube work all the time; Avoid four situation that switching tube is worked simultaneously, reduced the conducting and the drive loss of switching tube.Same; When input voltage from small to large in the change procedure; When reaching preset magnitude of voltage; When being V2 like input voltage; The PID gain parameter of Boost digital control circuit equates with the PID gain parameter of Buck digital control circuit; Bimodulus selects circuit 12 control change devices to switch to the Buck mode of operation from the Boost mode of operation; Simultaneously; In preset voltage range; Like input voltage V2 in the V1 scope; The PID gain parameter G of PID gain control circuit 116 control Buck digital control circuits 113 rises and rises along with input voltage vin, so that converter works in the Buck pattern, improves the converter dynamic response.
With reference to figure 4; Be depicted as circuit block diagram according to another preferred embodiment of mixed control apparatus of four switch Buck-Boost converters of the present invention; Present embodiment is identical with the circuit elements device of a last embodiment; Difference is, said digital control loop 11 comprises that an ADC change-over circuit 411, bimodulus select circuit 412, Buck digital control circuit 413, Boost digital control circuit 414 and DAC change-over circuit 415.
The output voltage error signal that said ADC change-over circuit 411 receives said output voltage feedback circuit, and be translated into corresponding with it digital signal.
The input voltage that said bimodulus selects circuit 412 to receive the input of said converter; Judge that according to the size variation of input voltage said converter works in Buck or Boost mode of operation, selects to connect said Buck digital control circuit 113 or Boost digital control circuit 114 with this.Be specially: when said input voltage during greater than said output voltage; Converter works in the Buck pattern; Connect said Buck digital control circuit 413 this moment; Be that said Buck digital control circuit 413 receives said output voltage error signals, produce first digital controlled signal with as said digital controlled signal; When said input voltage during less than said output voltage; Converter works in the Boost pattern; Connect said Boost digital control circuit 414 this moment; Be that said Boost digital control circuit 414 receives said output voltage error signals, produce second digital controlled signal with as said digital controlled signal;
Said DAC change-over circuit 415; All be connected with the output of said Buck digital control circuit 413 and said Boost digital control circuit 414; Receive said digital controlled signal; And be converted into corresponding simulating signal with it, with the analog control signal addition that realizes producing with analog control loop.
Analog control loop 12 in the present embodiment, output voltage feedback circuit 13, add circuit 14, switch control signal generating circuit 15 and PID gain control circuit 416 courses of work are identical with a last embodiment, repeat no more at this.The same mode of mixing control that adopts in the present embodiment, under stable situation, the switch motion of the mixing control signal control switch pipe that is superposeed by digital controlled signal and analog control signal is a steady state value to keep output voltage; When load is undergone mutation, by the switch motion of the mixing control signal control switch pipe of digital controlled signal and analog control signal stack, so that output voltage quickly recovers to said steady state value.But in the present embodiment, converter is operated in the next Buck of the having only digital control circuit of Buck pattern and produces action, and this moment, the Boost digital control circuit was failure to actuate; Converter is operated in the next Boost of the having only digital control circuit of Boost pattern and produces action, and this moment, the Buck digital control circuit was failure to actuate, and had reduced the loss of circuit.
Below to being elaborated according to the mixing control method of four switch Buck-Boost converters of the present invention.With reference to figure 5, be depicted as flow chart according to mixing control method one preferred embodiment of four switch Buck-Boost converters of the present invention, it may further comprise the steps:
S501: the output voltage that detects said converter output terminal;
S502: receive a said output voltage and a reference voltage, produce an output voltage error signal;
S503:, produce an analog control signal and a digital controlled signal respectively according to said output voltage error signal;
S504:, produce one and mix control signal according to said analog control signal and digital controlled signal;
S505: when said converter output terminal load saltus step did not take place, said mixing control signal was controlled the switch motion of switching tube in the said converter, was a steady state value to keep said output voltage;
When said converter output terminal load generation saltus step, said mixing control signal is controlled the switch motion of switching tube in the said converter, so that said output voltage returns to said steady state value fast.
In above-mentioned steps S503, further comprise: according to said output voltage error signal; Produce first digital controlled signal and second digital controlled signal respectively; Detect the input voltage of the input of said converter; When said input voltage during greater than said output voltage; Select said first digital controlled signal as said digital controlled signal; To produce the said control signal of mixing with said analog control signal; Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Buck pattern; When said input voltage during less than said output voltage; Select said second digital controlled signal as said digital controlled signal; To produce the said control signal of mixing with said analog control signal; Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Boost pattern.
In above-mentioned steps S503, further comprise: the input voltage that detects the input of said converter; When said input voltage during greater than said output voltage; According to said output voltage error signal; Produce first digital controlled signal with as said digital controlled signal; To produce the said control signal of mixing with said analog control signal; Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Buck pattern; When said input voltage during less than said output voltage; According to said output voltage error signal; Produce second digital controlled signal with as said digital controlled signal with as said digital controlled signal; To produce the said control signal of mixing with said analog control signal; Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Boost pattern.
Mixing control method described in the present embodiment adopts PID control and the 2nd PID control to produce said first digital controlled signal and said second digital controlled signal.In preset input voltage range; The gain parameter of controlling said PID control is followed the variation of said input voltage; So that said converter is when carrying out the switching of Buck and Boost mode of operation; The gain parameter of the gain parameter of said PID control and the 2nd PID control equates; Guarantee to carry out in the process of Buck or the switching of Boost mode of operation the output voltage substantially constant at converter.
Those skilled in the art can know that digital control circuit described in the present invention is not limited to above-mentioned PID control technology, can be the control technology that can realize digital control scheme of any suitable form.PID control among the present invention is controlled to be identical control technology with the 2nd PID; Therefore equally also can control the size of the 2nd PID gain parameter; Making it follow input voltage changes; Converter the 2nd PID gain parameter in Buck and Boost handoff procedure is equated with a PID gain parameter; Its control principle and process and above-mentioned control the one PID gain parameter are similar, equally also can realize the technique effect that above-mentioned mode of operation takes over seamlessly.
In sum; Mixed control apparatus of the present invention had both solved the dynamic response slow problem of Buck-Boost converter when the load saltus step; Solved the appearance output voltage fluctuation problem of system when stable state again, guaranteed that said Buck-Boost converter output voltage can fast quick-recovery stationary value and stable state accuracy height under the sudden change situation.Mixed control apparatus of the present invention can be realized taking over seamlessly of Buck or Boost mode of operation simultaneously, has further reduced the fluctuation of output voltage.
As indicated above according to embodiments of the invention, these embodiment do not have all details of detailed descriptionthe, do not limit this invention yet and only are described specific embodiment.Obviously, according to above description, can do a lot of modifications and variation.Embodiment is chosen and specifically described to this specification, is in order to explain principle of the present invention and practical application better, thereby person skilled can utilize the present invention and the modification on basis of the present invention to use well under making.The present invention only is subjected to the restriction of claims and four corner and equivalent.
Claims (12)
1. the mixing control method of a switch Buck-Boost converter is characterized in that, this method comprises:
Detect the output voltage of the output of said converter;
According to a said output voltage and a reference voltage, produce an output voltage error signal;
According to said output voltage error signal, produce an analog control signal and a digital controlled signal respectively;
According to said analog control signal and said digital controlled signal, produce one and mix control signal;
When said converter output terminal load saltus step did not take place, said mixing control signal was controlled the switch motion of switching tube in the said converter, was a steady state value to keep said output voltage;
When said converter output terminal load generation saltus step, said mixing control signal is controlled the switch motion of switching tube in the said converter, so that said output voltage returns to said steady state value fast.
2. the mixing control method of four switch Buck-Boost converters according to claim 1 is characterized in that, this method also comprises:
According to said output voltage error signal, produce first digital controlled signal and second digital controlled signal respectively;
Detect the input voltage of the input of said converter;
When said input voltage during, select said first digital controlled signal as said digital controlled signal, to produce the said control signal of mixing with said analog control signal greater than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Buck pattern;
When said input voltage during, select said second digital controlled signal as said digital controlled signal, to produce the said control signal of mixing with said analog control signal less than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Boost pattern.
3. the mixing control method of four switch Buck-Boost converters according to claim 1 is characterized in that, this method also comprises:
Detect the input voltage of the input of said converter;
When said input voltage during,, produce first digital controlled signal with as said digital controlled signal, to produce the said control signal of mixing with said analog control signal according to said output voltage error signal greater than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Buck pattern;
When said input voltage during,, produce second digital controlled signal with as said digital controlled signal, to produce the said control signal of mixing with said analog control signal according to said output voltage error signal less than said output voltage;
Said mixing control signal is controlled the switch motion of the switching tube of said converter, so that said converter works in the Boost pattern.
4. according to the mixing control method of claim 2 or 3 described four switch Buck-Boost converters, it is characterized in that this method also further comprises:
Adopt PID control to produce said first digital controlled signal;
Adopt the 2nd PID control to produce said second digital controlled signal.
5. the mixing control method of four switch Buck-Boost converters according to claim 4; It is characterized in that; In preset input voltage range; The gain parameter of controlling said PID control is followed the variation of said input voltage; So that said converter is when carrying out the switching of Buck and Boost mode of operation, the gain parameter of said PID control equates with the gain parameter of the 2nd PID control.
6. a realization is like the mixed control apparatus of the mixing control method of four switch Buck-Boost converters as described in claim 1 or 2 or 3 or 4 or 5; It is characterized in that; Said mixed control apparatus comprises output voltage feedback circuit, digital control loop, analog control loop and an add circuit; Wherein
Said output voltage feedback circuit is connected with the output of said Buck-Boost converter, in order to receiving the output voltage of said converter, and carries out the error computing to produce an output voltage error signal with a reference voltage;
Said digital control loop is connected with said output voltage feedback circuit, receives said output voltage error signal and produces a digital controlled signal;
Said analog control loop is connected with said output voltage feedback circuit, receives said output voltage error signal and produces an analog control signal;
Said add circuit is connected with said analog control loop with said digital control loop, in order to receiving said digital controlled signal and said analog control signal, and both additions are obtained one mixes control signal;
When said converter output terminal load saltus step did not take place, said mixing control signal was controlled the switch motion of switching tube in the said converter, was a steady state value to keep said output voltage;
When said converter output terminal load generation saltus step, said mixing control signal is controlled the switch motion of switching tube in the said converter, so that said output voltage returns to said steady state value fast.
7. mixed control apparatus according to claim 6; It is characterized in that; Said output voltage feedback circuit comprises an error amplifier, and said output voltage and said reference voltage that it will receive carry out the error computing, and exports said output voltage error signal.
8. mixed control apparatus according to claim 6 is characterized in that, said digital control loop comprises an ADC change-over circuit, bimodulus selection circuit, Buck digital control circuit, Boost digital control circuit and DAC change-over circuit,
Said ADC change-over circuit receives the output voltage error signal of said output voltage feedback circuit, and is translated into corresponding with it digital signal;
The input of said Buck digital control circuit input and Boost digital control circuit all is connected with said ADC change-over circuit; Convert the output voltage error signal of numeral in order to reception, and produce first digital controlled signal and second digital controlled signal in view of the above respectively;
Said bimodulus selects circuit to receive the input voltage of the input of said converter;
When said input voltage during greater than said output voltage, said Buck digital control circuit output is connected to said DAC change-over circuit, to select said first digital controlled signal as said digital controlled signal;
When said input voltage during less than said output voltage, said Boost digital control circuit output is connected to said DAC change-over circuit, to select said second digital controlled signal as said digital controlled signal;
Said DAC change-over circuit receives said digital controlled signal, and is converted into corresponding simulating signal with it, with the analog control signal addition that realizes producing with analog control loop.
9. mixed control apparatus according to claim 6 is characterized in that, said digital control loop comprises an ADC change-over circuit, bimodulus selection circuit, Buck digital control circuit, Boost digital control circuit and DAC change-over circuit,
Said ADC change-over circuit receives the output voltage error signal of said output voltage feedback circuit, and is translated into corresponding with it digital signal;
Said bimodulus selects circuit to receive the input voltage of the input of said converter;
When said input voltage during greater than said output voltage, said Buck digital control circuit receives said output voltage error signal, produces first digital controlled signal with as said digital controlled signal;
When said input voltage during less than said output voltage, said Boost digital control circuit receives said output voltage error signal, produces second digital controlled signal with as said digital controlled signal;
Said DAC change-over circuit; All be connected with the output of said Buck digital control circuit and said Boost digital control circuit; Receive said digital controlled signal, and be converted into corresponding simulating signal with it, with the analog control signal addition that realizes producing with analog control loop.
10. according to Claim 8 or 9 described mixed control apparatus, it is characterized in that,
Said Buck digital control circuit adopts PID control, to produce first digital controlled signal;
Said Boost digital control circuit adopts the 2nd PID control, to produce second digital controlled signal.
11. according to Claim 8 or 9 described mixed control apparatus, it is characterized in that said digital control loop further comprises the PID gain control circuit,
Said PID gain control circuit input receives input voltage signal; Output is connected with said Buck digital control circuit; In preset input voltage range; The gain parameter of controlling said PID control is followed the variation of said input voltage; So that said converter is when carrying out the switching of Buck and Boost mode of operation, the gain parameter of the gain parameter of said PID control and the 2nd PID control equates.
12. mixed control apparatus according to claim 6; It is characterized in that said mixed control apparatus further comprises switch control signal generating circuit; Said switch control signal generating circuit is connected with said add circuit, receives said mixing control signal and produces the four-way switch control signal respectively in order to control the switch motion of switching tube in the said converter.
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