CN103378716A - Method for regulating variation of output voltage of switching power supply - Google Patents
Method for regulating variation of output voltage of switching power supply Download PDFInfo
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- CN103378716A CN103378716A CN2012101224956A CN201210122495A CN103378716A CN 103378716 A CN103378716 A CN 103378716A CN 2012101224956 A CN2012101224956 A CN 2012101224956A CN 201210122495 A CN201210122495 A CN 201210122495A CN 103378716 A CN103378716 A CN 103378716A
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Abstract
The invention relates to a digital-control switching power supply, in particular to a method for regulating variation of output voltage of the switching power supply. When the output voltage of the switching power supply is regulated to increase or decrease, the speed of the increase or decrease of the output voltage is reduced through a digital method, and therefore an impact current caused by regulation of the output voltage is reduced. Due to the adoption of the digital method, the impact current can be regulated within an acceptable range according to the actual needs, and meanwhile the speed regulation is taken into account. The method for regulating the variation of the output voltage of the switching power supply has the advantages of effectively reducing the large impact current generated in the regulation process of the output voltage of the switching power supply, largely reducing the damage to related elements, and guaranteeing the power supply not to trip out caused by large current in the working process and not to affect work. The method for regulating the variation of the output voltage of the switching power supply is suitable for digital-control switching power supplies, particularly large-power switching power supplies with the power of more than 1kW.
Description
(1) technical field
The present invention relates to a kind of Switching Power Supply of digital control, relate in particular to a kind of method of adjustment of switch power source output voltage change.
(2) technical background
The basic structure of Switching Power Supply as shown in Figure 1, its control section can be analogue system, also can be digital system.Traditional Switching Power Supply generally all adopts analog control system, and its control assembly mainly is analog discrete components and integrated transporting discharging.This Switching Power Supply cost is lower, but because discrete component is more, and its performance is easily influenced by ambient temperature and change, and such closed-loop control stability is bad.Analog control system is difficult for realizing the higher meticulous control of complexity, for Switching Power Supply, is difficult to guarantee the stability of output when load and output voltage acute variation.
Along with the appearance of the development of Digital Electronic Technique, particularly High Performance SCM, DSP and FPGA, the control system of Switching Power Supply begins to the digitlization future development.Because the cost of digital device is in continuous decline, the cost of Switching Power Supply numerical control system is also in continuous decline.Adopt the Switching Power Supply of numerical control system also to be the digital switch power supply.The core devices of digital switch power control system is single-chip microcomputer, DSP or FPGA.Several common combinations of the basic hardware structure of digital switch power control system as shown in Figure 2.Compare with analog switched power supply, digital switch power supply not only hardware configuration is simple, and reliability is strong, can also carry out real-time accurate control to the output of Switching Power Supply, guarantees in the situation of load or output voltage acute variation the stability of output voltage or electric current.What the present invention is directed to is in the situation of output voltage acute variation, guarantees the stability of output current.
Although current Switching Power Supply numerical control system performance commonly used is higher than analog control system, and the stability of output voltage has had significantly raising in the situation of load acute variation, but generally all do not have to consider in the situation of output voltage acute variation, how to guarantee the stability of output current.And when high power switching power supply during for the production of the power devices of line, this situation is often to occur.For example, the aging process of product, the aging voltage of requirement can progressively reduce along with the time, therefore needed aging power supply that output voltage is regularly carried out falling in wink.According to electrotechnics fundamental formular i=Cdu/dt, rise in voltage wink or when falling in wink, du/dt can be very large, thereby i also can be very large.Rise or can produce when falling in wink the reason of very large impulse current in Here it is switch power source output voltage wink.
(3) summary of the invention
The enormous impact electric current that the object of the present invention is to provide a kind of output voltage that can effectively reduce Switching Power Supply to be in course of adjustment and to cause, significantly reduce the damage to relevant components and parts, and guarantee can not trip because impulse current is excessive in the Power Operating Process, thereby affect the method for adjustment of a kind of switch power source output voltage change of work.
The present invention is directed to Switching Power Supply produces large impulse current when output voltage wink rises or falls in wink situation, reduce the rate of change du/dt of output voltage by digital control approach, reduce impulse current, thereby the normal operation of the equipment of assurance reduces the damage to power supply and the relevant components and parts of other equipment.For the climbing speed of the digitized output voltage that reduces to take because of the impulse current that the electric power output voltage adjustment causes and the method for adjustment of fall off rate are:
(1) numerical control system of Switching Power Supply, every certain time interval T the goal-setting value of output voltage is carried out front and back relatively, when the absolute value of the poor Vdlt of default definite value and previous default definite value is greater than a certain prior set point V0 after the elapsed time interval T, start climbing speed or the fall off rate adjustment programme of output voltage;
(2) to the climbing speed of adjusting output voltage and the relevant parameters that fall off rate will be used, in the built-in static memory of the DSP of control circuit or FPGA, carry out pre-stored;
(3) in the adjustment programme of the climbing speed of switch power source output voltage or fall off rate, real-time value according to Vdlt, by loop up table, according to the relevant corresponding parameter of the pre-stored of searching, decide the climbing speed of the output voltage that will adopt or fall off rate;
(4) in the adjustment programme of the climbing speed of switch power source output voltage or fall off rate, between the adjustment period of output voltage, according to the mode that increases progressively one by one or successively decrease one by one, change the default definite value of output voltage, finally reach required value, progressively carry out proportional plus integral control.
For the information that can in time obtain requiring output voltage to change, the numerical control system of Switching Power Supply carries out front and back relatively every certain time interval T to the output voltage goal-setting that samples, and obtains the poor Vdlt of goal-setting value and previous goal-setting value behind the time interval T.Vdlt obtains a value every time interval T, may be on the occasion of, may be negative value, also may be zero.Preset the threshold value V0 of a Vdlt, when the absolute value of Vdlt is not more than V0, can think that the amplitude of variation of voltage is enough little, thereby voltage changing rate is also enough little, be not enough to cause larger impulse current, therefore this situation need not enter climbing speed or the fall off rate adjustment programme of output voltage.When the absolute value of Vdlt during greater than V0, think that then the climbing speed of output voltage or fall off rate have surpassed the tolerance limit, caused impulse current must reduce.At this moment, the numerical control system of Switching Power Supply will enter climbing speed or the fall off rate adjustment programme of output voltage.
After entering the climbing speed or fall off rate adjustment programme of output voltage, because varying in size of the impulse current that different Vdlt causes, and the power work environment (such as product line etc.) different to the time requirement of electric power output voltage transition, the amplitude that climbing speed or the fall off rate of output voltage are adjusted also can be different.Therefore, program is subject to the impact that Vdlt and transition require time T r (being the delay time of transition, irrelevant with T) to the amplitude of the climbing speed of output voltage or fall off rate adjustment.The value of Tr can be arranged by the user in advance.Different Vdlt makes up corresponding different transition speed with Tr.Therefore, in the nominal operational parameters scope of Switching Power Supply, we preset the combination of abundant Vdlt and Tr, the corresponding transition speed of each group combination.For for simplicity, only need to consider increase or the reduction of Fixed Time Interval voltage, it can represent transition speed, i.e. transition increment set point, making it is Vdt, can be the plus or minus value.In single adjustment process, Vdt is constant, namely processes like this voltage transient: will require transition time Tr to be divided into the N section, every section is Trd.From the zero-time of Tr, every time T rd, the output variable of voltage changes Vdt on the basis of last time output variable, until the Tr time finishes, at this moment total change amount of output voltage is NVdt, i.e. Vdlt.Can both the passing ratio integral operation reach output voltage stabilization in order to ensure each Trd time period, Trd must long enough, should be 10 times of the Switching Power Supply switch periods or more than.For example, the operating frequency of Switching Power Supply is 25KHz, and then its switch periods is 40us, and Trd should be not less than 400us so
Above-mentioned Vdlt and Tr make up corresponding Vdt and can find out by look-up table, set look-up table, just must be first Vdlt and Tr combination be stored first with the corresponding relation of Vdt, the present invention is stored in this corresponding relation in the built-in static memory of the DSP of control circuit or FPGA.Concrete storage means is: the address of Vdlt and Tr combination corresponding stored device, the cell stores of this address be the Vdt of this combination correspondence.Address setting is 8 10 systems, and high 4 are the Vdlt value, and unit is V; Low 4 are the Tr value, and unit is ms.The Vdt unit of storage is V.For example, work as Vdlt=100V, during Tr=20ms, corresponding Vdt is 2V, and access unit address corresponding to this combination is 00100020, and the content of storage is 2.When tabling look-up, control circuit receives Vdlt and the Tr value of user's input, and through relevant software computing, finding out corresponding memory unit address is 00100020, thereby reads the content 2 of memory cell.
The invention has the advantages that the enormous impact electric current that the output voltage that can effectively reduce Switching Power Supply is in course of adjustment and causes, significantly reduce the damage to relevant components and parts, and guarantee can not trip because impulse current is excessive in the Power Operating Process, thereby affect work.The present invention is applicable to adopt the above high power switching power supply of the Switching Power Supply of digital control, particularly 1KW to use.
(4) description of drawings
Fig. 1 is the basic structure of high power switching power supply;
Fig. 2 is several common combinations of the basic hardware structure of Switching Power Supply numerical control system;
Fig. 3 is the implementation process signal of switch power source output voltage transition of the present invention;
Fig. 4 is relevant parameters storage means signal of the present invention;
Fig. 5 is the software architecture of switching power source control circuit of the present invention.
(5) embodiment
Below in conjunction with embodiment the present invention is described in further detail:
The present invention is directed to Switching Power Supply produces large impulse current when output voltage wink rises or falls in wink situation, reduce the rate of change du/dt of output voltage by digital control approach, reduce impulse current, thereby the normal operation of the equipment of assurance reduces the damage to power supply and the relevant components and parts of other equipment.For the climbing speed of the digitized output voltage that reduces to take because of the impulse current that the electric power output voltage adjustment causes and the method for adjustment of fall off rate are:
(1) numerical control system of Switching Power Supply, every certain time interval T the goal-setting value of output voltage is carried out front and back relatively, when the absolute value of the poor Vdlt of default definite value and previous default definite value is greater than a certain prior set point V0 after the elapsed time interval T, start climbing speed or the fall off rate adjustment programme of output voltage.
(2) to the climbing speed of adjusting output voltage and the relevant parameters that fall off rate will be used, in the built-in static memory of the DSP of control circuit or FPGA, carry out pre-stored.
(3) in the adjustment programme of the climbing speed of switch power source output voltage or fall off rate, real-time value according to Vdlt, by loop up table, according to the relevant corresponding parameter of the pre-stored of searching, decide climbing speed or the fall off rate of the output voltage that will adopt.
(4) in the adjustment programme of the climbing speed of switch power source output voltage or fall off rate, between the adjustment period of output voltage, according to the mode that increases progressively one by one or successively decrease one by one, change the default definite value of output voltage, finally reach required value, progressively carry out the method for proportional plus integral control.
For the information that can in time obtain requiring output voltage to change, the numerical control system of Switching Power Supply carries out front and back relatively every certain time interval T to the output voltage goal-setting value that samples, and obtains the poor Vdlt of default definite value and previous default definite value behind the time interval T.Vdlt obtains a value every time interval T, may be on the occasion of, may be negative value, also may be zero.Preset the threshold value V0 of a Vdlt, when the absolute value of Vdlt is not more than V0, can think that the amplitude of variation of voltage is enough little, thereby voltage changing rate is also enough little, be not enough to cause larger impulse current, therefore this situation need not enter climbing speed or the fall off rate adjustment programme of output voltage.When the absolute value of Vdlt during greater than V0, think that then the climbing speed of output voltage or fall off rate have surpassed the tolerance limit, caused impulse current must reduce.At this moment, the numerical control system of Switching Power Supply will enter climbing speed or the fall off rate adjustment programme of output voltage.
After entering the climbing speed or fall off rate adjustment programme of output voltage, because varying in size of the impulse current that different Vdlt causes, and power work environment (such as product line etc.) to the time requirement of electric power output voltage transition different (do not require in this respect, but some special occasions has certain requirement), the amplitude that climbing speed or the fall off rate of output voltage are adjusted also can be different.Therefore, program is subject to the impact that Vdlt and transition require time T r (being the delay time of transition, irrelevant with T) to the amplitude of the climbing speed of output voltage or fall off rate adjustment.The value of Tr can be arranged by the user in advance.Different Vdlt makes up corresponding different transition speed with Tr.Therefore, in the nominal operational parameters scope of Switching Power Supply, we preset the combination of abundant Vdlt and Tr, the corresponding transition speed of each group combination.For for simplicity, only need to consider increase or the reduction of Fixed Time Interval voltage, it can represent transition speed, i.e. transition increment set point, making it is Vdt, can be the plus or minus value.In single adjustment process, Vdt is constant, namely processes like this voltage transient: as shown in Figure 3, will require transition time Tr to be divided into the N section, every section is Trd.From the zero-time of Tr, every time T rd, the output variable of voltage changes Vdt on the basis of last time output variable, until the Tr time finishes, at this moment total change amount of output voltage is NVdt, i.e. Vdlt.Can both the passing ratio integral operation reach output voltage stabilization in order to ensure each Trd time period, Trd must long enough, should be 10 times of the Switching Power Supply switch periods or more than.For example, the operating frequency of Switching Power Supply is 25KHz, and then its switch periods is 40us, and Trd should be not less than 400us so
Above-mentioned Vdlt and Tr make up corresponding Vdt and can find out by look-up table, set look-up table, just must be first Vdlt and Tr combination be stored first with the corresponding relation of Vdt, the present invention is stored in this corresponding relation in the built-in static memory of the DSP of control circuit or FPGA.As shown in Figure 4, concrete storage means is: the address of Vdlt and Tr combination corresponding stored device, the cell stores of this address be the Vdt of this combination correspondence.Address setting is 8 10 systems, and high 4 are the Vdlt value, and unit is V; Low 4 are the Tr value, and unit is ms.The Vdt unit of storage is V.For example, work as Vdlt=100V, during Tr=20ms, corresponding Vdt is 2V, and access unit address corresponding to this combination is 00100020, and the content of storage is 2.When tabling look-up, control circuit receives Vdlt and the Tr value of user's input, and through relevant software computing, finding out corresponding memory unit address is 00100020, thereby reads the content 2 of memory cell.
The high power switching power supply circuit structure that the present invention relates to is present general switching power circuit basic structure, basic circuit structure as shown in Figure 1.Power supply is for adopting the PWM control mode of IGBT module.The major loop of power supply can after the rectifier bridge module rectification, adopt phase whole-bridging circuit for single-phase or three-phase alternating current input, realizes PWM, after the transformer transformation, in secondary commutation filtering, exports desired direct voltage.The transformer adopting amorphous alloy transformer can effectively reduce the volume of power supply.At welding terminal, output voltage, electric current are sampled.The voltage and current value of sampling enters FEEDBACK CONTROL and protective circuit.
Content of the present invention comprises the hardware and software framework on control and protective circuit.Control mode is Digital Way.Several combinations of the digital control circuit hardware configuration of Switching Power Supply as shown in Figure 2, the present invention can adopt wherein any one.In order to realize the A/D conversion to sampled voltage and electric current, generally must use single-chip microcomputer or the DSP with A/D translation function, and FPGA do not possess the A/D translation function at present.The algorithm of the proportional integral algorithm of closed-loop control and control impulse current is generally realized with DSP or FPGA.According to the actual functional capability of numerical control system, its core devices is generally the combination of single-chip microcomputer and DSP, or the combination of single-chip microcomputer and FPGA, also can be three's combination.
The numerically controlled core of Switching Power Supply is software, and single-chip microcomputer, DSP and FPGA are the carriers of software, and software is finished function by these devices.Therefore, digital control Switching Power Supply is actually a kind of program control switch power supply.The relevant parameters that will adopt look-up table to search among the present invention is stored in the internal memory of DSP or FPGA.Fig. 3 is the implementation process signal of Switching Power Supply output waveform of the present invention transition, and Fig. 4 is relevant parameters storage means signal of the present invention, and the software architecture of realization as shown in Figure 5.
Claims (3)
1. the method for adjustment of switch power source output voltage change, it is characterized in that: be the impulse current that reduces to cause because of the electric power output voltage adjustment, adopt digital form, adjust climbing speed and the fall off rate of output voltage according to actual conditions and actual needs.
2. the method for adjustment of a kind of switch power source output voltage change according to claim 1 is characterized in that describedly reducing the climbing speed of the digitized output voltage taked because of the impulse current that the electric power output voltage adjustment causes and the method for adjustment of fall off rate is:
(1) every the time interval T goal-setting value of output voltage is carried out front and back relatively, when the absolute value of rear value and front value difference Vdlt during greater than a certain prior set point V0, start climbing speed or the fall off rate adjustment programme of output voltage, the adjustment speed of the pwm pulse width by changing control circuit output, remove to control the switch of power switching devices, thus climbing speed or the fall off rate of control output voltage;
(2) adjust the climbing speed of output voltage and the pre-stored method of the relevant parameters that fall off rate will be used;
(3) in real time according to the value of Vdlt, by loop up table, according to the relevant corresponding parameter of the pre-stored of searching, decide the climbing speed of the output voltage that will adopt or the method for fall off rate;
(4) between the adjustment period of output voltage, according to the mode that increases progressively one by one or successively decrease one by one, change the default definite value of output voltage, finally reach required value, progressively carry out the method for proportional plus integral control.
3. according to claim 1 or the method for adjustment of a kind of switch power source output voltage claimed in claim 2 change, its basic ideas are for realizing adjusting climbing speed and the fall off rate of output voltage, the adjustment speed of the pwm pulse width by changing control circuit output, remove to control the switch of power switching devices, thus the climbing speed of control output voltage or the method for fall off rate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105005221A (en) * | 2015-06-04 | 2015-10-28 | 中国科学院等离子体物理研究所 | Feedback control method for PSM high voltage power supply |
| CN112426222A (en) * | 2020-11-19 | 2021-03-02 | 重庆金山医疗器械有限公司 | Voltage output method, device, equipment, medium and high-frequency electrotome |
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| JP2006158141A (en) * | 2004-12-01 | 2006-06-15 | Matsushita Electric Ind Co Ltd | Motor driving device and air-conditioner |
| CN2842514Y (en) * | 2005-11-11 | 2006-11-29 | 东莞市友美电源设备有限公司 | The electricity-saving appliance of the slow slope of a kind of usefulness lifting pressure regulation |
| CN101257222A (en) * | 2008-04-07 | 2008-09-03 | 南阳宜和城市保障专用车辆研究所 | Mobile area burst stop current failure emergency electric power safeguard system |
| CN101391336A (en) * | 2008-10-24 | 2009-03-25 | 广东火电工程总公司 | Embedded digitization controlled tube-plate all-position automatic welding inverter |
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2012
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006158141A (en) * | 2004-12-01 | 2006-06-15 | Matsushita Electric Ind Co Ltd | Motor driving device and air-conditioner |
| CN2842514Y (en) * | 2005-11-11 | 2006-11-29 | 东莞市友美电源设备有限公司 | The electricity-saving appliance of the slow slope of a kind of usefulness lifting pressure regulation |
| CN101257222A (en) * | 2008-04-07 | 2008-09-03 | 南阳宜和城市保障专用车辆研究所 | Mobile area burst stop current failure emergency electric power safeguard system |
| CN101391336A (en) * | 2008-10-24 | 2009-03-25 | 广东火电工程总公司 | Embedded digitization controlled tube-plate all-position automatic welding inverter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005221A (en) * | 2015-06-04 | 2015-10-28 | 中国科学院等离子体物理研究所 | Feedback control method for PSM high voltage power supply |
| CN112426222A (en) * | 2020-11-19 | 2021-03-02 | 重庆金山医疗器械有限公司 | Voltage output method, device, equipment, medium and high-frequency electrotome |
| CN112426222B (en) * | 2020-11-19 | 2022-09-20 | 重庆金山医疗技术研究院有限公司 | Voltage output method, device, equipment, medium and high-frequency electrotome |
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Application publication date: 20131030 |