CN107196508A - A kind of Switching Power Supply control method of dynamic response optimization - Google Patents
A kind of Switching Power Supply control method of dynamic response optimization Download PDFInfo
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- CN107196508A CN107196508A CN201710433841.5A CN201710433841A CN107196508A CN 107196508 A CN107196508 A CN 107196508A CN 201710433841 A CN201710433841 A CN 201710433841A CN 107196508 A CN107196508 A CN 107196508A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of Switching Power Supply control method of dynamic response optimization, the control system constituted based on the control circuit including output voltage sampling circuit, amplifier isolation circuit and by core of microcontroller, the control system constitutes closed loop with controlled Switching Power Supply, and control system includes LUT (look-up table), LUT generation modules and index generation module.At the beginning of system worked well, LUT generation modules generate LUT according to pid parameter, after system work, control the generation of variable to be generated according to output voltage by index generation module to index, then directly searched among LUT and draw corresponding controlled quentity controlled variable, the process of calculating is eliminated, while accelerating the processing speed of this flow so that system ensures high-speed figure control performance while using low cost microcontroller.
Description
Technical field
The present invention relates to the Switching Power Supply controlling party of the control method of Switching Power Supply, more particularly to a kind of optimization of dynamic response
Method, belongs to switch power technology field.
Background technology
In field of switch power, dynamic response is an important indicator for assessing Switching Power Supply performance, improves digital power
Control method can improve the dynamic response capability of power supply.Determine a material impact of the dynamic response performance of Switching Power Supply
Factor is exactly the pid control module in Switching Power Supply.Two key factors of pid control module have impact on the dynamic response of system
Performance, one is the parameters of pid control module, including Proportional coefficient K p, integral coefficient Ki and differential coefficient Kd.Two be PID
The implementation of control module.
Traditional PID is achieved in that using the computing unit in microcontroller to realize, i.e., when system is according to operation
The related system data such as output voltage collected, according to the parameters of pid control module, is calculated down according to formula
Controlled quentity controlled variable required for one cycle.But it is due to that digital control there are its distinctive digital rings relative to traditional simulation control
Road postpones.Total digital control loop delay includes ADC samplings and calculates time, PWM outputs delay, crystal with conversion time, PID
Pipe switching time and PID perform speed period sum.Wherein ADC samples and the representative value of conversion time is 500 nanoseconds, PID meters
The representative value of evaluation time is 1 microsecond, and it is 2 microseconds that PID, which performs speed period representative value,.So controlling gauge in pid control module
The process of calculation occupies most of digital control loop control delay.If it is considered that the delay that digital control loop is brought
Influence, be likely to result in it is current calculate controlled quentity controlled variable and be not suitable for the phenomenon of present case, so as to cause the mistake of system
Adjust.So us are accomplished by when using digital control shortens digital control brought loop delay as far as possible.Together
When, the problem of control speed is also there is in digital control, inexpensive microcontroller does not often support floating point arithmetic, so that
Cause the calculating of controlled quentity controlled variable inaccurate, control waveform has digital control distinctive staircase waveform, and the micro-control of low cost
Device processed does not often have floating number computing unit (FPU), and the time-consuming of calculating process is increased significantly, numerically controlled loop is increased
Delay.
In addition, because Switching Power Supply extensive work is in industrial quarters environment, its product consumption is big, for product
Cost is more sensitive.Generally require to be weighed between the cost of product and the dynamic response effect of product for this client.
In order to obtain good dynamic response effect, client generally require using high speed support the microcontroller of floating number to be controlled with
Control speed is improved, while also needing to the microcontroller of high primary frequency to accelerate the calculating process of pid control module, so as to shorten loop
Delay.But these high primary frequencies, the unit cost of microcontroller with floating number computing unit are often higher, undoubtedly improve
The cost of final products.
According to more than market condition and theoretical condition, propose one kind can ensure simultaneously low cost, control speed and
The implementation method of the pid control module of time is just particularly important, and with high market significance.
The content of the invention
The purpose of the present invention is that the deficiency existed for existing technology provides a kind of Switching Power Supply of dynamic response optimization
Control method, can ensure being controlled to Switching Power Supply for inexpensive and high speed simultaneously.
The technical solution used in the present invention is as follows：A kind of Switching Power Supply control method of dynamic response optimization, its feature
It is：Based on the control circuit structure including output voltage sampling circuit, amplifier isolation circuit and by core of microcontroller
Into control system, the control system constitutes closed loop with controlled Switching Power Supply, and output voltage sampling circuit passes through electric resistance partial pressure
The output voltage of sampling switch power supply, the control that microcontroller is control core is given in output after amplifier isolation circuit
Circuit, control circuit by control core of microcontroller include AD conversion module, look-up table LUT modules, index generation module,
Look-up table LUT generation modules and Pulse width modulation module, the input signal of AD conversion module is amplifier isolation circuit
Output signal, AD conversion module transmits the output voltage values after conversion to index generation module, and index generation module is according to adopting
The output voltage values of the switching power circuit that sample is obtained, which are calculated, obtains output voltage error value, output voltage error integrated value and defeated
Go out voltage error differential value, and the index for generating three-dimensional LUT using these three values is used for searching corresponding control in LUT
What is stored in amount, LUT modules is micro- according to different output voltage values, output voltage error integrated value and output voltage error
The controlled quentity controlled variable that the corresponding utilization PID of score value combination calculation formula is calculated, LUT generation modules are in system life's work
Before, travel through all possible output voltage error value, output voltage integrated value, output voltage differential value and be used as PID calculation formula
Parameter, calculate the control variable value corresponding to the combination of this three using PID calculation formula, be stored in the built-in of microcontroller
In Flash or external Flash, when LUT generate and store finish after, system provide metal-oxide-semiconductor in Switching Power Supply driving letter
Number, beginning normal work, the output voltage values of pilot switch power circuit, when the output voltage values are not inconsistent with setting value, AD
The output voltage values are passed to index generation module by modular converter, and index generation module is calculated according to output voltage values
Output voltage error value, output voltage error integrated value, output voltage error differential value, and indexed these values as lookup,
Searched in Flash and draw corresponding control variable value, control variable is finally applied to pulse width modulation generation module
To adjust the output voltage values of Switching Power Supply.
Upon power-up of the system, the control circuit by control core of microcontroller performs the initialization of relevant parameter and its interior
The configuration of portion's correlation module, including pulse width modulation generation module, AD conversion module, while configuring in LUT generation modules
Pid parameter, including Proportional coefficient K p, integral coefficient Ki, differential coefficient Kd, then system in LUT generation modules PID ginseng
Number, travels through all possible output voltage error value, output voltage error integrated value, output voltage error differential value and is used as PID
The parameter of calculation formula, calculates corresponding control variable value, is then store in the built-in Flash or outer of microcontroller
Put in Flash.
The workflow of control circuit by control core of microcontroller comprises the following steps：
1) relevant parameter of system is initialized according to the preset value of system first, including configuration switch power supply is defeated
Go out magnitude of voltage, configuration timer, A/D modular converters and interrupt including related peripherals mode of operation and running parameter, its
Middle timer is used in pulse width modulation generation module, for the switch of the metal-oxide-semiconductor M1 in controlling switch power circuit, configuration
A/D modular converters work configures the interruption of timer to adjust dutycycle using pid control module to control power in DMA mode
Topological output voltage；
2) configuration LUT generation modules in PID calculation formula relevant parameter, including Proportional coefficient K p, integral coefficient Ki,
Differential coefficient Kd；
3) LUT generation modules travel through all possible output voltage error value, output voltage error integrated value, output voltage
The combination of error differential value, and the control variable corresponding to the situation is calculated using calculation formula, then will be with corresponding
Output voltage error value, output voltage error integrated value, output voltage error differential value are as index, and the control calculated becomes
Amount is as a result, be stored in the built-in Flash of microcontroller or in external Flash；
4) wait after foregoing schemes completion, microcontroller provides drive signal so that Switching Power Supply normal work；
5) output voltage of AD sampling modules monitoring switch power supply, if the output voltage values of setting and actual magnitude of voltage are not
It is consistent, then output voltage values is passed into index generation module.Index generation module is calculated simultaneously according to output voltage error value
Output voltage error integrated value, output voltage error differential value, calculating process is, by by output voltage error value and previous meter
The output voltage error integrated value of calculation carries out accumulation calculating, obtains new output voltage error integrated value.By by output voltage
Error amount is differentiated with previous output voltage error value, obtains new output voltage error differential value.While basis
Above three value calculates index value, to search corresponding control variable in LUT；
6) three index values generated according to index generation module, are converted into corresponding address, phase are read in Flash
Corresponding control variable, and the variable is applied to pulse width modulation generation module, the output electricity to adjust Switching Power Supply
Pressure.
7) continue the value of monitoring output voltage, if not being inconsistent with setting value, return to 5) step execution.
The output voltage sampling circuit includes resistance R1 and resistance R2, resistance R1 one end connecting valve power circuit
Output end, resistance the R1 other end connection resistance R2, resistance R2 other end connection output ground terminal, resistance R1 and resistance R2 company
Connect the output end that end is sampled for partial pressure.
The amplifier isolation circuit is operational amplifier k, operational amplifier k negative terminal connection resistance R1 and resistance R2
Connection end, operational amplifier k anode connection output ground terminal.
The controlled Switching Power Supply includes the lifting/voltage reducing topological circuit that PID is adjusted：Boost circuit, Buck circuits and
Buck-Boost circuits etc..
Advantages of the present invention and remarkable result：
1st, the storage result of PID calculation formula is stored using LUT, when system output voltage changes, according to AD
Sampled value, which can be searched directly, draws corresponding control variable, micro- with high-speed floating point number computing unit (FPU) without being equipped with
Controller is so as to reduce the cost of product.
2nd, control variable is stored using LUT, obtains controlling variable relative to calculating using microcontroller, it is middle time-consuming
Greatly shorten, so that digital loop delay is reduced, so as to improve loop stability.
3rd, same make can be reached while the microcontroller using inexpensive low velocity using the product of this control method
With the microcontroller identical effect of high cost high speed.Performance is ensure that while cost is reduced.
Brief description of the drawings
Fig. 1 is overall structure block diagram of the present invention；
Fig. 2 is present system schematic diagram；
Fig. 3 is control program flow chart of the present invention.
Embodiment
Technical scheme is described in detail below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of Switching Power Supply control method of the dynamic response optimization of inexpensive high speed, it is characterised in that bag
Controlled Switching Power Supply, output voltage sampling circuit and its amplifier isolation circuit are included, and is made as with micro-control the control of core
The control system that circuit processed is constituted.Control system is characterised by comprising LUT, LUT generation module and indexes generation module.
At the beginning of system worked well, LUT generation modules generate LUT according to pid parameter, therefore after system work, control variable
Generation is generated according to output voltage by index generation module and indexed, and is then directly searched among LUT and is drawn corresponding controlled quentity controlled variable,
The process of calculating is eliminated, while accelerating the processing speed of this flow.
Fig. 2 is Fig. 1 physical circuit, using Boost boost topology circuits as embodiment.Output voltage sampling circuit passes through
The sampling resistor R of Boost boost topology circuits1,R2Partial pressure is sampled, resistance R1,R2Connection end for output voltage sample output
End, resistance R2The other end connection output ground terminal；
Amplifier isolation circuit is operational amplifier, wherein, operational amplifier k correspondence output voltage sampling circuits, fortune
Calculate amplifier k negative terminal connection output voltage sampled output, operational amplifier k anode connection output ground terminal；
Control circuit by control core of microcontroller includes AD conversion module, LUT, index generation module, LUT generations
Module, Pulse width modulation module, the input signal of AD conversion module are operational amplifier k output signal, AD conversion module
Output voltage values after conversion are transmitted to index generation module, obtained output voltage values of the generation module according to sampling are indexed
Calculating obtains output voltage error value, output voltage error integrated value, output voltage error differential value, then utilizes these three values
Generation three-dimensional LUT index is used for searching corresponding controlled quentity controlled variable in LUT.What is stored in LUT modules is according to different defeated
Go out magnitude of voltage, output voltage error integrated value and the combination of output voltage error differential value, corresponding utilization PID calculating is public
The controlled quentity controlled variable that formula is calculated.LUT generation modules before system life's work, travel through all possible output voltage error value,
Output voltage integrated value, output voltage differential value, and calculate control corresponding to the combination of this three using PID calculation formula and become
Value, then forms LUT by correlated results and is stored in the built-in Flash of microcontroller in either external Flash chip.
Referring to Fig. 3, the workflow of the control circuit by control core of microcontroller comprises the following steps：
1) relevant parameter of system is initialized according to the preset value of system first, includes the output electricity of initialization system
Pressure value, and configuration timer, A/D modular converters, interrupt etc. related peripherals mode of operation and running parameter.Wherein timing
Device is used in pulse width modulation generation module, for controlling the metal-oxide-semiconductor M in Boost boost topology circuits1Switch, configuration
A/D modular converters work configures the interruption of timer to adjust dutycycle using pid control module to control output in DMA mode
Voltage.
2) relevant parameter of the PID calculation formula in configuration LUT generation modules, including Proportional coefficient K p, integral coefficient Ki,
Differential coefficient Kd.
3) LUT generation modules travel through all possible output voltage error value, output voltage error integrated value, output voltage
The combination of error differential value, and calculate using calculation formula the control variable corresponding to the situation.Then will be with corresponding
Output voltage error value, output voltage error integrated value, output voltage error differential value are as index, and the control calculated becomes
Amount is as a result, be stored in the built-in Flash of microcontroller or in external Flash.
4) wait after foregoing schemes completion, microcontroller provides drive signal so that Boost boost topology circuits are normal
Work.
5) output voltage of AD sampling modules monitoring system, if the output voltage values of setting and the magnitude of voltage not phase of reality
Symbol, then pass to index generation module by output voltage values.Index generation module calculates defeated simultaneously according to output voltage error value
Go out voltage error integrated value, output voltage error differential value.Main processes of calculation is to calculate output voltage error value with previous
Output voltage error integrated value carry out accumulation calculating, obtain new output voltage error integrated value.By the way that output voltage is missed
Difference is differentiated with previous output voltage error value, obtains new output voltage error differential value.Simultaneously according to upper
State three values and calculate index value, to search corresponding control variable in LUT.
6) three index values generated according to index generation module, are converted into corresponding address, phase are read in Flash
Corresponding control variable.And the variable is applied to pulse width modulation generation module, the output voltage to regulating system.
7) continue the value of monitoring output voltage, if not being inconsistent with setting value, return to 5) step execution.
The course of work of control system of the present invention is as follows：Upon power-up of the system, using microcontroller as the control of control core
Circuit performs the initialization of relevant parameter, and its internal correlation module configuration, including pulse width modulation generation module, AD turn
Change the mold block.The pid parameter configured simultaneously in LUT generation modules includes Proportional coefficient K p, integral coefficient Ki, differential coefficient Kd.So
Pid parameter of the system in LUT generation modules, travels through all possible output voltage error value, output voltage error product afterwards
Score value, output voltage error differential value calculate corresponding control variable value, then as the parameter of PID calculation formula
It is stored in the built-in Flash of microcontroller or external Flash.When LUT generate and store finish after, system provides MOS
The drive signal of pipe, starts normal work, and the output voltage values of monitoring system, when the output voltage values and setting value of system
When not being inconsistent, output voltage values are passed to index generation module by AD conversion module, and index generation module is according to output voltage values, meter
Calculation draws output voltage error value, output voltage error integrated value, output voltage error differential value, and regard these values as lookup
Index, searches in Flash and draws corresponding control variable value, finally produces control variable applied to pulse width modulation
Module is to adjust output voltage values.
The present invention is also applied for Buck in addition to suitable for above-mentioned Boost circuit topology, and the circuit such as Buck-Boost is opened up
Flutter.These circuits are by that can calculate dutycycle by PID, by dutycycle come the output voltage of regulating system.In Boost
When being applied outside circuit topology in remaining circuit topology, it is only necessary to according to the metal-oxide-semiconductor quantity of topological circuit, pulse width modulation is adjusted
The PWM wave number amounts of module generation.
Claims (6)
1. a kind of Switching Power Supply control method of dynamic response optimization, it is characterised in that：Based on including output voltage sampling circuit,
The control system that amplifier isolation circuit and control circuit by core of microcontroller are constituted, the control system with it is controlled
Switching Power Supply constitutes closed loop, and output voltage sampling circuit is by the output voltage of electric resistance partial pressure sampling switch power supply, through over-sampling
The control circuit that microcontroller is control core is given in output after Amplification and insulation circuit, using microcontroller as the control of control core
Circuit includes AD conversion module, look-up table LUT modules, index generation module, look-up table LUT generation modules and pulse width modulation
Module, the input signal of AD conversion module is the output signal of amplifier isolation circuit, and AD conversion module will be defeated after conversion
Go out magnitude of voltage to transmit to index generation module, the output voltage values for the switching power circuit that index generation module is obtained according to sampling
Calculating obtains output voltage error value, output voltage error integrated value and output voltage error differential value, and utilizes these three values
Generation three-dimensional LUT index is according to different defeated for searching stored in corresponding controlled quentity controlled variable, LUT modules in LUT
The calculating for going out magnitude of voltage, output voltage error integrated value and the corresponding utilization PID of output voltage error differential value combination is public
The controlled quentity controlled variable that formula is calculated, LUT generation modules before system life's work, travel through all possible output voltage error value,
Output voltage integrated value, output voltage differential value calculate this three as the parameter of PID calculation formula using PID calculation formula
Combination corresponding to control variable value, be stored in the built-in Flash of microcontroller or external Flash, when LUT generation simultaneously
After storage is finished, system provides the drive signal of metal-oxide-semiconductor in Switching Power Supply, starts normal work, pilot switch power circuit
Output voltage values, when the output voltage values and setting value are not inconsistent, the output voltage values are passed to index by AD conversion module
Generation module, index generation module calculates output voltage error value, output voltage error integration according to output voltage values
Value, output voltage error differential value, and these values are searched in Flash as index is searched and show that corresponding control becomes
Value, control variable finally be applied to pulse width modulation generation module to adjust the output voltage values of Switching Power Supply.
2. the Switching Power Supply control method of dynamic response optimization according to claim 1, it is characterised in that：When system starts
When, the control circuit by control core of microcontroller performs the initialization of relevant parameter and its configuration of internal correlation module,
Including pulse width modulation generation module, AD conversion module, while the pid parameter in LUT generation modules is configured, including ratio system
Number Kp, integral coefficient Ki, differential coefficient Kd, then pid parameter of the system in LUT generation modules, is traveled through all possible
Output voltage error value, output voltage error integrated value, output voltage error differential value are used as the parameter of PID calculation formula, meter
Calculation draws corresponding control variable value, is then store in the built-in Flash of microcontroller or external Flash.
3. the Switching Power Supply control method of dynamic response optimization according to claim 1 or 2, it is characterised in that：With micro-control
Device processed comprises the following steps for the workflow of the control circuit of control core：
1) relevant parameter of system is initialized according to the preset value of system first, includes the output electricity of configuration switch power supply
The mode of operation and running parameter of related peripherals including pressure value, configuration timer, A/D modular converters and interruption, wherein fixed
When device be used in pulse width modulation generation module, for the switch of the metal-oxide-semiconductor M1 in controlling switch power circuit, to configure A/D
Modular converter work configures the interruption of timer to adjust dutycycle using pid control module to control power topology in DMA mode
Output voltage；
2) relevant parameter of the PID calculation formula in configuration LUT generation modules, including Proportional coefficient K p, integral coefficient Ki, differential
COEFFICIENT K d；
3) LUT generation modules travel through all possible output voltage error value, output voltage error integrated value, output voltage error
The combination of differential value, and the control variable corresponding to the situation is calculated using calculation formula, then will be with corresponding output
Voltage error value, output voltage error integrated value, output voltage error differential value are as index, and the control variable calculated is made
For result, it is stored in the built-in Flash of microcontroller or in external Flash；
4) wait after foregoing schemes completion, microcontroller provides drive signal so that Switching Power Supply normal work；
5) output voltage of AD sampling modules monitoring switch power supply, if the output voltage values of setting and the magnitude of voltage not phase of reality
Symbol, then pass to index generation module by output voltage values.Index generation module calculates defeated simultaneously according to output voltage error value
Go out voltage error integrated value, output voltage error differential value, calculating process is, by the way that output voltage error value is calculated with previous
Output voltage error integrated value carry out accumulation calculating, obtain new output voltage error integrated value.By the way that output voltage is missed
Difference is differentiated with previous output voltage error value, obtains new output voltage error differential value.Simultaneously according to upper
State three values and calculate index value, to search corresponding control variable in LUT；
6) three index values generated according to index generation module, are converted into corresponding address, are read in Flash corresponding
Control variable, and by the variable be applied to pulse width modulation generation module, the output voltage to adjust Switching Power Supply.
7) continue the value of monitoring output voltage, if not being inconsistent with setting value, return to 5) step execution.
4. the Switching Power Supply control method of dynamic response optimization according to claim 1, it is characterised in that：Output voltage is adopted
Sample circuit includes resistance R1 and resistance R2, the output end of resistance R1 one end connecting valve power circuit, the resistance R1 other end
Resistance R2 is connected, resistance R2 other end connection exports ground terminal, and resistance R1 and resistance R2 connection end is the output that partial pressure is sampled
End.
5. the Switching Power Supply control method of the dynamic response optimization according to claim 1 or 4, it is characterised in that：Sampling is put
Big isolation circuit is operational amplifier k, operational amplifier k negative terminal connection resistance R1 and resistance R2 connection end, operation amplifier
Device k anode connection output ground terminal.
6. the Switching Power Supply control method of dynamic response optimization according to claim 1, it is characterised in that：It is described controlled
Switching Power Supply includes the lifting/voltage reducing topological circuit that PID is adjusted：Boost circuit, Buck circuits and Buck-Boost circuits.
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| US20110122660A1 (en) * | 2009-11-26 | 2011-05-26 | Stmicroelectronics S.R.L. | Current mode digital control of the output voltage of a switching power supply |
| US8976543B1 (en) * | 2011-03-15 | 2015-03-10 | Lockheed Martin Corporation | Full bridge power supply with digital feedback |
| CN103051186A (en) * | 2012-12-29 | 2013-04-17 | 东南大学 | Fast transient response digital switch converter and control method of fast transient response digital switch converter |
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