CN102355131B - 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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- CN102355131B CN102355131B CN201110311210.9A CN201110311210A CN102355131B CN 102355131 B CN102355131 B CN 102355131B CN 201110311210 A CN201110311210 A CN 201110311210A CN 102355131 B CN102355131 B CN 102355131B
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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, because its input and output homophase, switching loss are low, output voltage can rise and can degradation advantage all receive people's concern always, also become the focus of current research to the Optimal Control Strategy of its circuit.At present, control program to sort circuit in domestic research is mainly analog control mode, wherein analog control mode comprises again two kinds of voltage mode and current-modes: voltage mode is fairly simple, mainly comprise an error amplifier and logical circuit, error amplifier two inputs receive respectively output voltage sampled signal and a reference signal, the signal of its output and a sawtooth signal comparison, then by logical circuit, produce switch controlling signal, but sort circuit need increase a more complicated compensating circuit, and dynamic response is very slow; Current-mode is widely used relatively, it mainly comprises error amplifier and current comparator, error amplifier receives 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 inductor current signal of current comparator, by relatively generation one switch controlling signal of current comparator, this mode changes output voltage by changing input current, and its dynamic responding speed is still slower.Domestic also have some researchs on based on current-mode, as the patent No.: 200910095890.8 disclose a kind of by current-mode and non-linear four switch dc-dc converters that combine, it improves dynamic responding speed by methods such as a plurality of comparators and design compensation circuit, but its control procedure is very complicated, peripheral circuit components and parts are various, and circuit loss is larger.
The digital control strategy of four switch Buck-boost converters has been carried out to some researchs abroad, as introduced the fast dynamic response that the digital control approach combining by linear loop circuit and non-linear loop circuit is realized circuit in document < < A Dual-loop Digital Controller for Switching DC-DC Converters > >, when the output load generation saltus step of converter, non-linear loop energy quick adjustment converter work duty ratio and make output voltage quickly recover to stationary value.But situation when this pure digi-tal control mode weak point is not take into account circuit stable state, because digital control circuit exists the problem of quantified precision, during stable state also may there is little disturbance in system, as the amplitude of disturbance does not reach the thresholding of digital quantization, now numerical control system will not produce action, to such an extent as to cannot guarantee that output voltage remains constant.
Summary of the invention
The object 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, described mixing control method comprises digital control approach and analog control mode, and produce respectively a digital controlled signal and an analog control signal according to output voltage error signal, then both stacks are obtained to a mixing control signal, under stable state, in described mixing control signal energy control change device, the switch motion of switching tube be take and maintained output voltage as a steady state value, when load generation saltus step, in described mixing control signal energy control change device, the switch motion of switching tube is so that converter output voltage quickly recovers to steady state value.It is the transient changing of response transform device fast not only, improves stable state accuracy, and circuit is controlled simple.
Mixing control method according to a kind of four switch Buck-Boost converters of the present invention, comprising:
Detect the output voltage of the output of described converter;
According to described output voltage and a reference voltage, produce an output voltage error signal;
According to described output voltage error signal, produce respectively an analog control signal and a digital controlled signal;
According to described analog control signal and described digital controlled signal, produce a mixing control signal;
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
Further, the mixing control method of four described switch Buck-Boost converters also comprises:
According to described output voltage error signal, produce respectively the first digital controlled signal and the second digital controlled signal;
Detect the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, select described the first digital controlled signal as described digital controlled signal, to produce the described control signal of mixing with described analog control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Buck pattern;
When described input voltage is less than described output voltage, select described the second digital controlled signal as described digital controlled signal, to produce the described control signal of mixing with described analog control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Boost pattern.
Further, the mixing control method of four described switch Buck-Boost converters also comprises:
Detect the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, according to described output voltage error signal, produces the first digital controlled signal and using as described digital controlled signal, to produce the described control signal of mixing with described analog control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Buck pattern;
When described input voltage is less than described output voltage, according to described output voltage error signal, produces the second digital controlled signal and using as described digital controlled signal, to produce the described control signal of mixing with described analog control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Boost pattern.
Preferably, adopt a PID to control and produce described the first digital controlled signal; Adopt the 2nd PID to control and produce described the second digital controlled signal.
Preferably, in default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost mode of operation, the gain parameter that a described PID controls equates with the gain parameter that the 2nd PID controls.
According to a kind of mixed control apparatus of realizing the mixing control method of four switch Buck-Boost converters of the present invention, described mixed control apparatus comprises output voltage feedback circuit, digital control loop, analog control loop and an add circuit; Wherein,
Described output voltage feedback circuit, is connected with the output of described Buck-Boost converter, in order to receive the output voltage of described converter, and carries out error computing to produce an output voltage error signal with a reference voltage;
Described digital control loop, is connected with described output voltage feedback circuit, receives described output voltage error signal and produces a digital controlled signal;
Described analog control loop, is connected with described output voltage feedback circuit, receives described output voltage error signal and produces an analog control signal;
Described add circuit, is connected with described analog control loop with described digital control loop, in order to receive described digital controlled signal and described analog control signal, and both additions is obtained to a mixing control signal;
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
Further, described output voltage feedback circuit comprises an error amplifier, and it carries out error computing by the described output voltage receiving and described reference voltage, and exports described output voltage error signal.
Further, described 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,
Described ADC change-over circuit receives the output voltage error signal of described output voltage feedback circuit, and is translated into corresponding with it digital signal;
The input of described Buck digital control circuit input and Boost digital control circuit is all connected with described ADC change-over circuit, in order to receive, be converted to digital output voltage error signal, and produce respectively accordingly the first digital controlled signal and the second digital controlled signal;
Described bimodulus selects circuit to receive the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, described Buck digital control circuit output is connected to described DAC change-over circuit, usings and selects described the first digital controlled signal as described digital controlled signal;
When described input voltage is less than described output voltage, described Boost digital control circuit output is connected to described DAC change-over circuit, usings and selects described the second digital controlled signal as described digital controlled signal;
Described DAC change-over circuit, receives described digital controlled signal, and is converted into corresponding with it analog signal, to realize the analog control signal producing with analog control loop, is added.
Further, described 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,
Described ADC change-over circuit receives the output voltage error signal of described output voltage feedback circuit, and is translated into corresponding with it digital signal;
Described bimodulus selects circuit to receive the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, described Buck digital control circuit receives described output voltage error signal, produces the first digital controlled signal and usings as described digital controlled signal;
When described input voltage is less than described output voltage, described Boost digital control circuit receives described output voltage error signal, produces the second digital controlled signal and usings as described digital controlled signal;
Described DAC change-over circuit, all be connected with the output of described Boost digital control circuit with described Buck digital control circuit, receive described digital controlled signal, and be converted into corresponding with it analog signal, to realize the analog control signal producing with analog control loop, be added.
Preferably, described Buck digital control circuit adopts a PID to control, to produce the first digital controlled signal; Described Boost digital control circuit adopts the 2nd PID to control, to produce the second digital controlled signal.
Further, described digital control loop further comprises PID gain control circuit, described PID gain control circuit input receives input voltage signal, output is connected with described Buck digital control circuit, in default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost mode of operation, the gain parameter that the gain parameter that a described PID controls and the 2nd PID control equates.
Further, described mixed control apparatus also comprises switch control signal generating circuit, described switch control signal generating circuit, is connected with described add circuit, receives described mixing control signal and produces four-way switch control signal respectively in order to control the switch motion of switching tube in described converter.
The present invention controls by simulation and digital control coefficient method has solved the dynamic response problem of four switch Buck-Boost converters when load saltus step, the response speed of raising system, the recovery time of output voltage is fast, simultaneously, also guarantee when stable state, even if system occurs small sample perturbations and can detect control, improved the stable state accuracy of system.In addition, the present invention carries out the switching of system works pattern by the variation of monitoring input voltage, and Control PID gain parameter is along with input voltage changes, can be so that in the process of switching at circuit working state, output voltage is substantially constant, has reduced output voltage fluctuation, and system is only operated in Buck pattern or Boost pattern, there is not Buck-Boost pattern, reduced the conducting of switch and driven loss.Mixed control apparatus of the present invention has to be controlled simply, fast response time, stable state accuracy high.
Accompanying drawing explanation
Figure 1 shows that the circuit block diagram according to mixed control apparatus one preferred embodiment of four switch Buck-Boost converters of the present invention.
Figure 2 shows that the working waveform figure according to circuit shown in Fig. 1.
Figure 3 shows that the schematic diagram that switches a preferred embodiment according to Buck of the present invention and Boost mode of operation.
Figure 4 shows that the circuit block diagram according to another preferred embodiment of mixed control apparatus of four switch Buck-Boost converters of the present invention.
Figure 5 shows that 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 are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any in marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.In order to make the public that the present invention is had thoroughly and be understood, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have for a person skilled in the art the description of these details also can understand the present invention completely.
With reference to figure 1, be depicted as the 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, described 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.
Described output voltage feedback circuit 13, is connected with the output of described Buck-Boost converter, in order to receive the output voltage of described Buck-Boost converter, and carries out error computing to export an output voltage error signal with a reference voltage.Here, described output voltage feedback circuit 13 specifically comprises an error amplifier, and under stable situation, described reference voltage equates with described output voltage; When load generation saltus step, output voltage meeting transition rising or transition decline, and now output voltage error signal value will become large.Those skilled in the art can know accordingly other technologies or element by inference and as long as can realize, the feedback of output voltage all be can be applicable to the output voltage feedback circuit in the present embodiment as subtracter, comparator etc.
Described ADC change-over circuit 111 receives the output voltage error signal of described output voltage feedback circuit 13, and is translated into corresponding with it digital signal.
The input of described Buck digital control circuit 113 inputs and Boost digital control circuit 114 is all connected with described ADC change-over circuit 111, in order to receive, be converted to digital output voltage error signal, and produce respectively the first digital controlled signal and the second digital controlled signal.Here, described Buck digital control circuit 113 adopts a PID to control, and described Boost digital control circuit adopts the 2nd PID to control, to obtain above-mentioned the first digital controlled signal and the second digital controlled signal.
Described bimodulus selects circuit 112 to receive the input voltage of the input of described converter, and judge that according to the size variation of input voltage described converter works in Buck or Boost mode of operation, selects to connect described Buck digital control circuit 113 or Boost digital control circuit 114 with this.Be specially: when described input voltage is greater than described output voltage, converter is operated in Buck pattern, now connect described Buck digital control circuit 113, be about to described Buck digital control circuit 113 outputs and be connected to described DAC change-over circuit 111, using and select described the first digital controlled signal as described digital controlled signal; When described input voltage is less than described output voltage, converter is operated in Boost pattern, now connect described Boost digital control circuit 114, be about to described Boost digital control circuit 114 outputs and be connected to described DAC change-over circuit 111, using and select described the second digital controlled signal as described digital controlled signal.
Described DAC change-over circuit 115, receives above-mentioned digital controlled signal, and is converted into corresponding with it analog signal, to realize the analog control signal producing with analog control loop, is added.
Described add circuit 14, is connected with described analog control loop with described digital control loop, in order to receive described digital controlled signal and described analog control signal, and both additions is obtained to a mixing control signal; Described switch control signal generating circuit 15, is connected with described add circuit 14, receives described mixing control signal and produces four-way switch control signal respectively in order to control the switch motion of four switching tubes in described converter.
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value.In steady operation process, as there is larger disturbance, digital control loop 11 and analog control loop 12 can detect output voltage error signal simultaneously, produce respectively digital controlled signal and analog control signal, and by add circuit 14, be mixed to get and mix control signal and come control switch pipe to move, with regulation output voltage stabilization at steady state value; As while there is small sample perturbations, analog control loop 12 can detect this small output voltage error signal, and carry out disturbance suppression by analog control loop 12, guarantee that described converter output is constant, now due to the reason of digital ADC transducer quantified precision, if the amplitude of disturbance may 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 being produced by analog control circuit, maintains output voltage constant, improves stable state accuracy.
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.As judged, Current Transform device is operated in 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 decline in transition, the output voltage error signal of now error amplifier 131 outputs becomes large, Buck digital control circuit 113 in digital control circuit 11 carries out regulating and controlling effect after output voltage error signal being detected, the duty ratio of control switch pipe S1 increases fast, makes output voltage rise rapidly and to reach stationary value.In like manner, when load is during from heavy duty to 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, makes output voltage decline rapidly and to reach stationary value.
As judged, current circuit working is under Boost pattern, and switching tube S1 is often open-minded, and switching tube S3 often turn-offs, and by switching tube S3 and switching tube S4 alternation switch, realizes boosting rectifier control.When load is downloaded to heavily loaded saltus step on the lenient side, output voltage can decline in transition, the output voltage error signal of error amplifier 131 outputs becomes large, Boost digital control circuit 114 in digital control circuit 11 carries out regulating and controlling effect after output voltage error signal being detected, the duty ratio of control switch pipe S3 increases, and makes output voltage rise and reach stationary value rapidly.In like manner, when load is during from heavy duty to 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 makes output voltage decline and reach stationary value rapidly.
When load generation saltus step, analog control loop also receives described output voltage error signal simultaneously, produce an analog control signal in order to the duty ratio of by-pass cock pipe, but in this process, because the speed of digital controlled signal response is more 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 being produced by digital control circuit, thereby also realized the quick response to transient changing, made output voltage return to fast steady state value.
Shown in figure 2, Fig. 2 is the working waveform figure according to circuit shown in Fig. 1, from Fig. 2 a, can find out, when there is to be downloaded on the lenient side heavy duty sudden change in load, it is larger that the variation (dotted line in Fig. 2 a) of mixing control signal Vcomp in mixing control program changes (solid line in Fig. 2 a) while controlling than simple simulation, the speed of its by-pass cock pipe duty ratio also can be faster accordingly like this, so regulation output magnitude of voltage quickly.Therefore, from Fig. 2 b, can learn, adopt mixing control program output voltage recovery time (t2-t1) to control (t3-t1) output voltage than simple simulation and also want short a lot of recovery time, dynamic response is fast.
Further, described digital control loop 11 also comprises PID gain control circuit 116, described PID gain control circuit 116 inputs receive input voltage, output is connected with described Buck digital control circuit 113, in default input voltage range, the gain parameter that the described PID of PID gain control circuit 116 control controls is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost mode of operation, the gain parameter that the gain parameter that a described PID controls and the 2nd PID control equates.Can guarantee that like this converter is in carrying out Buck and Boost work-mode switching process, output voltage fluctuation is little.In the present embodiment, the concrete PID gain parameter of controlling Buck digital control circuits 113 for described PID gain control circuit 116 is along with input voltage (rising) decline (rising) that decline, with the gain parameter that regulates a PID to control, the gain parameter that a PID controls when converter mode of operation is switched is equated with the gain parameter that the 2nd PID controls.
With reference to figure 3, be depicted as the schematic diagram that switches a preferred embodiment according to Buck of the present invention and Boost mode of operation, its specific works process is: the PID gain of PID gain control circuit 116 control Buck digital control circuits 113 is along with the decline of input voltage declines, when input voltage vin is greater than V1, converter is operated in Buck pattern; When Vin<=V1 and Vin>=V2, the gain parameter G of Buck PID control circuit is along with Vin declines and declines, and now described converter is still operated in Buck pattern; When input voltage vin drops to V2, bimodulus selects circuit 112 control change devices to enter Boost mode of operation, and the PID gain parameter that now described PID gain control circuit 116 is controlled Buck digital control circuits drops to the PID gain parameter of Boost digital control circuit and equates, after this, when input voltage vin is less than V2, described converter is still operated in Boost pattern.At the gain place of equating, control switching and make the transition of converter from Buck pattern to Boost pattern very mild, therefore can guarantee output voltage stabilization, output voltage there will not be larger fluctuation.And, the Buck-Boost converter of controlling in this way is only operated in Buck state or Boost state, there is not Buck-Boost state, in each switch periods, only have all the time two switching tube work, avoided four situations that switching tube is worked simultaneously, reduced the conducting of switching tube and driven loss.Same, when input voltage is from small to large in change procedure, when reaching default magnitude of voltage, while being V2 as 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 be switched to Buck mode of operation from Boost mode of operation, simultaneously, in default voltage range, if input voltage V2 is within the scope of V1, PID gain control circuit 116 is controlled the PID gain parameter G of Buck digital control circuit 113 along with input voltage vin rises and rises, so that converter works in Buck pattern, improve converter dynamic response.
With reference to figure 4, be depicted as the circuit block diagram according to another preferred embodiment of mixed control apparatus of four switch Buck-Boost converters of the present invention, the present embodiment is identical with the circuit elements device of a upper embodiment, difference is, described 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.
Described ADC change-over circuit 411 receives the output voltage error signal of described output voltage feedback circuit, and is translated into corresponding with it digital signal.
Described bimodulus selects circuit 412 to receive the input voltage of the input of described converter, according to the size variation of input voltage, judge that described converter works in Buck or Boost mode of operation, selects to connect described Buck digital control circuit 113 or Boost digital control circuit 114 with this.Be specially: when described input voltage is greater than described output voltage, converter works in Buck pattern, now connect described Buck digital control circuit 413, be that described Buck digital control circuit 413 receives described output voltage error signal, produce the first digital controlled signal and using as described digital controlled signal; When described input voltage is less than described output voltage, converter works in Boost pattern, now connect described Boost digital control circuit 414, be that described Boost digital control circuit 414 receives described output voltage error signal, produce the second digital controlled signal and using as described digital controlled signal;
Described DAC change-over circuit 415, all be connected with the output of described Boost digital control circuit 414 with described Buck digital control circuit 413, receive described digital controlled signal, and be converted into corresponding with it analog signal, to realize the analog control signal producing with analog control loop, be added.
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 upper embodiment, do not repeat them here.In the present embodiment, same employing mixed the mode of controlling, and under stable situation, the switch motion of the mixing control signal control switch pipe being superposeed by digital controlled signal and analog control signal, take and maintain output voltage as a steady state value; When load is undergone mutation, the switch motion of the mixing control signal control switch pipe being superposeed by digital controlled signal and analog control signal, so that output voltage quickly recovers to described steady state value.But in the present embodiment, converter is operated in the next Buck of the only having digital control circuit of Buck pattern and produces action, and now Boost digital control circuit is failure to actuate; Converter is operated in the next Boost of the only having digital control circuit of Boost pattern and produces action, and now Buck digital control circuit is failure to actuate, and has reduced the loss of circuit.
Below the mixing control method according to four switch Buck-Boost converters of the present invention is elaborated.With reference to figure 5, be depicted as the flow chart according to mixing control method one preferred embodiment of four switch Buck-Boost converters of the present invention, it comprises the following steps:
S501: the output voltage that detects described converter output terminal;
S502: receive described output voltage and a reference voltage, produce an output voltage error signal;
S503: according to described output voltage error signal, produce respectively an analog control signal and a digital controlled signal;
S504: according to described analog control signal and digital controlled signal, produce a mixing control signal;
S505: when described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintain described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
In above-mentioned steps, S503 further comprises: according to described output voltage error signal, produce respectively the first digital controlled signal and the second digital controlled signal, detect the input voltage of the input of described converter, when described input voltage is greater than described output voltage, select described the first digital controlled signal as described digital controlled signal, to produce the described control signal of mixing with described analog control signal, described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Buck pattern; When described input voltage is less than described output voltage, select described the second digital controlled signal as described digital controlled signal, to produce the described control signal of mixing with described analog control signal, described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Boost pattern.
In above-mentioned steps, S503 further comprises: the input voltage that detects the input of described converter, when described input voltage is greater than described output voltage, according to described output voltage error signal, producing the first digital controlled signal usings as described digital controlled signal, to produce the described control signal of mixing with described analog control signal, described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Buck pattern; When described input voltage is less than described output voltage, according to described output voltage error signal, producing the second digital controlled signal usings and usings as described digital controlled signal as described digital controlled signal, to produce the described control signal of mixing with described analog control signal, described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Boost pattern.
Mixing control method described in the present embodiment adopts a PID to control and the 2nd PID controls described the first digital controlled signal of generation and described the second digital controlled signal.In default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost mode of operation, the gain parameter that the gain parameter that a described PID controls and the 2nd PID control equates, guarantee to carry out in the process of Buck or the switching of Boost mode of operation at converter output voltage substantially constant.
Those skilled in the art are known, and 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.A PID in the present invention controls and the 2nd PID controls as identical control technology, 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 load saltus step, solved again the appearance output voltage fluctuation problem of system when stable state, guaranteed that the fast quick-recovery stationary value of described Buck-Boost converter output voltage energy in sudden change situation and stable state accuracy are high.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.
According to embodiments of the invention as described above, these embodiment do not have all details of detailed descriptionthe, and also not limiting this invention is only described specific embodiment.Obviously, according to above description, can make many modifications and variations.Embodiment is chosen and specifically described to this specification, is in order to explain better principle of the present invention and practical application, thereby under making, technical field technical staff can utilize the present invention and the modification on basis of the present invention to use well.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (6)
1. a mixing control method for four switch Buck-Boost converters, is characterized in that it comprises:
Detect the output voltage of the output of described converter;
According to described output voltage and a reference voltage, produce an output voltage error signal;
According to described output voltage error signal, produce an analog control signal;
Detect the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, according to described output voltage error signal, adopts a PID to control and produce the first digital controlled signal;
According to described analog control signal and described the first digital controlled signal, produce a mixing control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Buck pattern;
When described input voltage is less than described output voltage, according to described output voltage error signal, adopts the 2nd PID to control and produce the second digital controlled signal;
According to described analog control signal and described the second digital controlled signal, produce described mixing control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Boost pattern;
In default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost pattern, the gain parameter that a described PID controls equates with the gain parameter that the 2nd PID controls;
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
2. a mixing control method for four switch Buck-Boost converters, is characterized in that it comprises:
Detect the output voltage of the output of described converter;
According to described output voltage and a reference voltage, produce an output voltage error signal;
According to described output voltage error signal, produce an analog control signal;
According to described output voltage error signal, adopt a PID to control and produce the first digital controlled signal;
According to described output voltage error signal, adopt the 2nd PID to control and produce the second digital controlled signal;
Detect the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, according to described analog control signal and described the first digital controlled signal, produce a mixing control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Buck pattern;
When described input voltage is less than described output voltage, according to described analog control signal and described the second digital controlled signal, produce described mixing control signal;
Described mixing control signal is controlled the switch motion of the switching tube of described converter, so that described converter works in Boost pattern;
In default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost pattern, the gain parameter that a described PID controls equates with the gain parameter that the 2nd PID controls;
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
3. a mixed control apparatus of realizing the mixing control method of four switch Buck-Boost converters as claimed in claim 1 or 2, it is characterized in that described mixed control apparatus comprises output voltage feedback circuit, digital control loop, analog control loop and an add circuit, wherein:
Described output voltage feedback circuit, is connected with the output of described Buck-Boost converter, in order to receive the output voltage of described converter, and carries out error computing to produce an output voltage error signal with a reference voltage;
Described digital control loop is connected with described output voltage feedback circuit, and it comprises an ADC change-over circuit, bimodulus selection circuit, Buck digital control circuit, Boost digital control circuit, DAC change-over circuit and PID gain control circuit;
Described ADC change-over circuit receives described output voltage error signal, and is translated into corresponding with it digital signal;
Described bimodulus selects circuit to receive the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, described Buck digital control circuit receives described digital signal, and adopts a PID to control to produce the first digital controlled signal;
When described input voltage is less than described output voltage, described Boost digital control circuit receives described digital signal, and adopts the 2nd PID to control to produce the second digital controlled signal;
The input of described PID gain control circuit receives described input voltage, output is connected with described Buck digital control circuit, in default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost pattern, the gain parameter that the gain parameter that a described PID controls and the 2nd PID control equates;
Described DAC change-over circuit is all connected with the output of described Boost digital control circuit with described Buck digital control circuit, receives described the first digital controlled signal or the second digital controlled signal, and is converted into corresponding with it analog signal;
Described analog control loop, is connected with described output voltage feedback circuit, receives described output voltage error signal and produces an analog control signal;
Described add circuit, is connected with described analog control loop with described digital control loop, in order to receive described analog signal and described analog control signal, and both additions is obtained to a mixing control signal;
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
4. a mixed control apparatus of realizing the mixing control method of four switch Buck-Boost converters as claimed in claim 1 or 2, it is characterized in that described mixed control apparatus comprises output voltage feedback circuit, digital control loop, analog control loop and an add circuit, wherein:
Described output voltage feedback circuit, is connected with the output of described Buck-Boost converter, in order to receive the output voltage of described converter, and carries out error computing to produce an output voltage error signal with a reference voltage;
Described digital control loop is connected with described output voltage feedback circuit, and it comprises an ADC change-over circuit, bimodulus selection circuit, Buck digital control circuit, Boost digital control circuit, DAC change-over circuit and PID gain control circuit;
Described ADC change-over circuit receives described output voltage error signal, and is translated into corresponding with it digital signal;
The input of described Buck digital control circuit input and Boost digital control circuit is all connected with described ADC change-over circuit, described Buck digital control circuit receives described digital signal, and adopts a PID to control to produce the first digital controlled signal;
Described Boost digital control circuit receives described digital signal, and adopts the 2nd PID to control to produce the second digital controlled signal;
Described bimodulus selects circuit to receive the input voltage of the input of described converter;
When described input voltage is greater than described output voltage, the output of described Buck digital control circuit is connected to described DAC change-over circuit, and described DAC change-over circuit receives the first digital controlled signal, and is converted into corresponding with it analog signal;
When described input voltage is less than described output voltage, the output of described Boost digital control circuit is connected to described DAC change-over circuit, and described DAC change-over circuit receives the second digital controlled signal, and is converted into corresponding with it analog signal;
The input of described PID gain control circuit receives described input voltage, output is connected with described Buck digital control circuit, in default input voltage range, the gain parameter of controlling a described PID control is followed the variation of described input voltage, so that described converter is when carrying out Buck and the switching of Boost pattern, the gain parameter that the gain parameter that a described PID controls and the 2nd PID control equates;
Described analog control loop, is connected with described output voltage feedback circuit, receives described output voltage error signal and produces an analog control signal;
Described add circuit, is connected with described analog control loop with described digital control loop, in order to receive described analog signal and described analog control signal, and both additions is obtained to a mixing control signal;
When described converter output terminal load saltus step does not occur, described mixing control signal is controlled the switch motion of switching tube in described converter, take and maintains described output voltage as a steady state value;
When described converter output terminal load generation saltus step, described mixing control signal is controlled the switch motion of switching tube in described converter, so that described output voltage returns to described steady state value fast.
5. according to the mixed control apparatus described in claim 3 or 4, it is characterized in that described output voltage feedback circuit comprises an error amplifier, it carries out error computing by the described output voltage receiving and described reference voltage, and exports described output voltage error signal.
6. according to the mixed control apparatus described in claim 3 or 4, it is characterized in that described mixed control apparatus further comprises switch control signal generating circuit, described switch control signal generating circuit, be connected with described add circuit, receive described mixing control signal and produce four-way switch control signal respectively in order to control the switch motion of switching tube in described converter.
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| CN107994776A (en) * | 2017-12-28 | 2018-05-04 | 深圳市核达中远通电源技术股份有限公司 | A kind of One Buck-Boost converter body and its free switching control method |
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| CN110912405B (en) * | 2019-10-18 | 2022-12-13 | 杭州东氿科技有限公司 | Four-switch buck-boost converter based on voltage mode control |
| CN116526848B (en) * | 2023-06-30 | 2024-02-20 | 广东高斯宝电气技术有限公司 | Control method for seamless switching of four-switch Buck-Boost converter |
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| US8749213B2 (en) * | 2009-06-09 | 2014-06-10 | Silergy Technology | Mixed mode control for switching regulator with fast transient responses |
| CN101931323B (en) * | 2010-08-05 | 2012-11-28 | 西安交通大学 | Method for enhancing non-uniform variation grid width of light load efficiency of integrated switch DC-DC converter |
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