CN101800484A - Pulse accuracy control circuit for pulse power supply - Google Patents
Pulse accuracy control circuit for pulse power supply Download PDFInfo
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Abstract
The invention relates to a pulse accuracy control circuit for a pulse power supply, which comprises a DSP control board, a main control board, a key display board and a switching power supply main circuit board, wherein an outer ring control circuit is formed between the DSP control board and the main control board, and the main control board forms an inner ring control circuit by the PWM control technology. The scheme of the invention constructively adopts a digital and analog double closed-loop control circuit to control a pulse basic value and a peak value, thereby achieving higher output accuracy; and the double closed-loop control mode comprises inner ring control and outer ring control. The invention further solves the problems that the control circuit in the prior art has poor accuracy, can not meet the operating requirement, and can not realize intellectualization.
Description
Technical field
The present invention relates to pulse power technical field, relate in particular to a kind of pulse accuracy control circuit for pulse power supply.
Background technology
Along with the ground develop rapidly of current I T industry, required precision to semiconductor element, connector, circuit board improves day by day, the miniaturization of integrated circuit, the miniaturization of end product, this will the seek survival element that produces the littler encapsulation of processing and connector, meticulousr printing circuit board line and via hole, more accurate flexible PCB.These fast-developing electronic products are had higher requirement to the electronics electroplating industry, and rectifier needs it that more accurately controlled electric energy is provided as the main power of Electroplating Production.In the what is more important our times scope consciousness that reduces energy resource consumption has been brought up to unprecedented height, this has high challenge for the Treatment of Metal Surface industry of high energy consumption.And pulse plating has higher efficient for traditional direct current electrode position, under identical energy loss, higher output can be arranged, and experimental results show that precious metal (gold under the pulse plating condition, silver etc.) use can be still less, and the more fine and close coating of acquisition, the consumption that this had both saved energy for this industry, the use of having saved precious metal again.Therefore can predict following Treatment of Metal Surface will be based on pulse plating.
The pulse power has good advantages when precious metal is electroplated, and the second best in quality pulse output waveform plays crucial effects, generally needs to export square wave such as Fig. 1, and amplitude and time precision can guarantee electroplating quality in 1%.Reach high like this precision, accuracy control circuit is absolutely necessary.And still there is not such High Accuracy Control circuit in the prior art.
At present, existing solution is to adopt common 8 or 16 processor of single chip computer to form a pulse generator to come control impuls output, and directly single closed loop control mode of power controlling element output of direct use high-performance processor such as DSP (Digital SignalProcessing digital signal processor) is also arranged.
If adopt pure simulation controlling schemes, in pulse control, very big realization difficulty will be arranged so, because pulse output itself is discrete, and simulation control is continuous, need realize with pure hardware circuit.Like this otherwise hardware circuit very complicated, realize that the controlled function cost is very high, reliability and maintenanceability reduce greatly, or can only realize simple functions control, the control precision of voltage, electric current and impulse waveform is very poor, can not satisfy instructions for use and intelligentized demand.
If adopt the pure digi-tal controlling schemes, the digital processing unit that uses mainly is single-chip microcomputer and DSP at present, and the latter has huge advantage on speed and performance.DSP with the C28XX series of Industries, Inc of Texas Instruments is an example, this processor is special a outstanding processor at Industry Control, work clock with 100MHz, provide switching drive signal by the inner PWM of processor (Pluse Width Moudlation pulse width modulation), the operating frequency of tackling current Switching Power Supply tens KHz has been enough, just can go wrong when still being used for modulating high-frequency switching signal.Experimental results show that how the advanced person can not fine assurance export the waveform and the precision of pulse to algorithm, the phenomenon that occurs pulse-losing sometimes, so the waveform that DSP can't paired pulses carries out in time and control accurately, relies on the control disappearance that digital processing unit can cause whole system fully.
What also have is exactly the mode of digital added analogue, and so basic way is exactly that the PWM drive signal of power supply is realized by simulated mode, and digital circuit partly is responsible for man-machine interface and pulse modulated control.But because the controlling schemes that this scheme is current has only an interior closed-loop control loop at present, this has just caused sometimes can occurring pulse base value and the low phenomenon of peak value precision.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of pulse accuracy control circuit for pulse power supply is provided, can not satisfy instructions for use and realize intelligentized problem with the low precision that solves control circuit in the prior art.
Realize that technical scheme of the present invention is as follows:
A kind of pulse accuracy control circuit for pulse power supply comprises DSP (Digital Signal Processing digital signal processor) control board, master board, button display panel and Switching Power Supply main circuit board; Form the outer shroud control loop between DSP control board and the master board, master board adopts PWM (Pluse WidthMoudlation pulse width modulation) control technology to form interior ring control loop.
Described Switching Power Supply main circuit board provides feedback signal, BLOCK signal and current limliting signal to master board.
Loop control circuit comprises PWM controller, electric current and voltage sampling amplifying circuit CPLD (Complex Programmadle Logic Device CPLD) programmable chip, analog multiplexer and chip for driving in the described master board; Wherein, master board is amplified through operational amplification circuit electric current and voltage feedback signal, signal after the amplification is again through PWM modulation and the shaping of CPLD driving pulse, drive signal is through the transformer coupled power tube of delivering to, and master board is exported adjustment accordingly according to current limliting signal and BLOCK soft-off signal.
Described DSP control board and button display panel, master board and Switching Power Supply main circuit board carry out respectively alternately; Wherein, the interaction content of DSP control board and Switching Power Supply main circuit board comprises the start and stop of the slow startup of controlling main circuit, main circuit fan and speed governing, the exchange of RS-485 communication data, relay signal output, and power amplifier board temperature signal, the primary voltage accepted on the main circuit detect.
The signal flow of described outer shroud control loop comprises, the DSP control board receives voltage, electric current and the anomaly detection signal of master board, and feed back base value setting, peak value setting and pulse-modulated signal, set up being connected of shows signal and control signal between master board and the button display panel simultaneously.
Described outer shroud control loop is finished the base value of voltage, electric current and peak value by comparator and by the comparing element between the feedback signal of A/D sampling processing.
Described comparator link comprises: continuous constant pressure compares, and constant current is compared continuously, and the pulse voltage base value compares, and crest value of impulse voltage compares, and the pulse current base value compares, and pulse current peak relatively.
Three outer increase control signals are controlled in the selected CV/CC control of three groups of analog multiplexers in the described DSP control board, output mode control, pulse modulation, and it is input to interior ring control loop as interior ring setting signal.
Described DSP control board adopts pid control algorithm, and its operating procedure comprises:
A, each peripheral hardware of initialization read operational factor;
Whether b, scanning button display panel have button to press, and handle subprogram and execution in step c if having then enter button event, if not then carry out steps d;
C, according to user's operation, preserve the parameter of change, and enter step e;
Whether d, scanning have knob to regulate, if there is knob to regulate, then enters knob and regulate event handling subprogram and execution in step c; If do not have knob to regulate, then enter step e;
E, judge whether power mode is continuous output; If execution in step f then, if not execution in step g then;
F, to measuring the electric current and voltage effective value after the signal sampling filtering, carry out outer shroud PID control and DA output, and execution in step h;
The base value and the peak value of g, the output of sampling filter power supply, and execution in step h;
H, judged whether that 1/4 second clock interrupts, if do not arrive, then forwards the beginning of main circulating program to; If to 1/4 second time, then add up ampere-hour and carry out the output of Control Node signal, and execution in step i;
I, judge whether power supply is operated in continuous constant current output mode, if then the non-linear section of electric current output is compensated, and output pulse modulation control signal; If not then directly exporting pulse modulation control signal and execution in step j;
J, judge that whether power supply is at continuous output mode, come the control impuls precision if not then calculating PID pulse output outer shroud control signal being set according to pulse, show that output is handled with the I/O mouth,, and so far return and finish major cycle if then directly show and I/O mouth output processing.
The present invention compared with prior art has following advantage:
1, two closed control circuits of the constructive employing digital added analogue of the present invention come control impuls base value and peak value, thereby have reached higher output accuracy.
2, a large amount of control requirement that experimental results show that this control circuit coincidence pulse power supply output accuracy of specific embodiments of the invention process, thus make the pulse power bring into play huge advantage aspect the precious metal plating.
3, because being in different mode of operations, power supply makes that the number of comparators of control circuit can be many, adopted analog multiplexer that signal is selected among the present invention, thereby reduced the quantity of control comparator, and reduced the quantity of simulation control element, effectively prevented the wasting of resources.
Description of drawings
Fig. 1 is the pulse output waveform schematic diagram of pulse accuracy control circuit for pulse power supply of the present invention;
Fig. 2 is a hardware circuit schematic diagram of the present invention;
Fig. 3 is a control loop schematic diagram of the present invention;
Fig. 4 is a master board modular circuit schematic diagram of the present invention;
Fig. 5 is a DSP control board modular circuit schematic diagram of the present invention;
Fig. 6 is a precision Control Software flow chart of the present invention.
Embodiment
Two closed control circuits of the constructive employing digital added analogue of the present invention program come control impuls base value and peak value, thereby have reached higher output accuracy.
A kind of specific embodiment of the present invention has used half-bridge topology and BUCK converter, is input as single-phase 220VAC power supply, output 10V100A.Unidirectional pulse pattern when output pulse width is the narrowest to be 0.5ms, and controlled resolution is 0.1ms, and output waveform is a square wave.
As shown in Figure 2, pulse accuracy control circuit for pulse power supply of the present invention is made up of four parts, it is respectively the DSP control section, the master control part, button display part and Switching Power Supply main body, the corresponding DSP control board of difference, master board, button display panel and four parts of Switching Power Supply main circuit board in hardware block diagram.
Wherein, the Switching Power Supply main circuit provides feedback signal, BLOCK signal and current limliting signal to master board.Master board is amplified through operational amplifier electric current and voltage feedback signal, signal after the amplification passes through PWM (Pluse Width Moudlation pulse width modulation) modulation and the shaping of CPLD driving pulse again, and drive signal is through the transformer coupled power tube of delivering to then.Master board is simultaneously exported adjustment accordingly according to current limliting signal and BLOCK soft-off signal.Master board provides voltage, electric current and anomaly detection signal to the DSP control board, and meanwhile, master board is accepted from base value being set, peak value and pulse-modulated signal are set of DSP control board, and corresponding adjustment is made in output.
The DSP control board carries out the output of control signal corresponding after accepting voltage, electric current and the anomaly detection signal of master board, comprises offering the setting of master control base value, peak value setting and pulse-modulated signal, offers button display panel shows signal simultaneously.The DSP control board is also accepted the push button signalling from the button display panel, then according to these push button signallings, exports to the master board control signal.Between DSP control board and master board, formed an outer shroud control loop like this.The DSP control board is except carrying out alternately with button display panel and master board, also carry out alternately with the Switching Power Supply main circuit board, its mutual content comprises the start and stop of the slow startup of controlling main circuit, main circuit fan and speed governing, the exchange of RS-485 communication data, relay signal output; Simultaneously, the DSP control board receives and opens detection signal from the power amplifier board temperature signal on the Switching Power Supply main circuit board, primary voltage detection signal and general supply sky.
Control loop among the present invention is the core of whole embodiment, affects the normal operation of whole power-supply system and the control of output prograin, ring control and outer shroud control in the double circle controling mode that this programme uses comprises.Its control procedure specifically describes as follows:
As shown in Figure 3, control loop is respectively outer shroud control loop and interior ring control loop.The outer shroud control loop passes through comparator and is compared by the feedback signal after the A/D sampling processing at the base value and the peak value of the voltage of setting by the user under the control of DSP, electric current, have six groups of such comparing elements in the outer shroud control loop, be respectively that continuous constant pressure compares, constant current relatively continuously, the pulse voltage base value relatively, crest value of impulse voltage compares, and the pulse current base value compares, and pulse current peak relatively.Because synchronization is only used one group and is controlled output variable in actual use, and this unique one group control output variable is passed through three groups of analog multiplexers decisions by CV/CC control, output mode control, three outer increase control signals of pulse modulation control.This chosen group control output variable is input in the interior ring control loop as the setting signal of interior ring, PWM controller, voltage sample amplifying circuit, current sample amplifying circuit are arranged in interior ring control loop, itself and power amplification circuit have been formed classical Switching Power Supply control loop, promptly interior ring control loop.
Two closed-loop control hardware circuits that this programme uses are made of two parts: master board module and DSP control board module, and the structural representation of master board module is seen Fig. 4, the structural representation of DSP control board module is seen Fig. 5.
As shown in Figure 4, traditional PWM control technology has been adopted in interior ring control, the main master board module of using, comprising the current and voltage signals formed by the accurate amplifier of the U11A amplifying circuit of sampling, and with reference voltage by high-speed comparator U10A, U10B, U10C compares, the control signal that has appropriate response speed by suitable frequency compensation output, this control signal input pwm chip U3, U3 is modulated to control signal on the PWM drive signal up to 50kHz again, and drive signal carries out the sequential adjustment by CPLD U6 and waveform adjusts after chip for driving U2, U4, U5, U7 is done by isolation drive transformer control half-bridge power plumber.Because being in different mode of operations, power supply makes that the number of comparators of control circuit can be many in addition, and we have adopted analog multiplexer U8 in this programme, U8 is carried out signal and is selected by CV/CC control (CV/CC), output mode control (OUTMOD), pulse modulation control (PLSMOD) three control signals, these three signals are from DSP, and process U6 carries out sequencing control.So just make the control comparator reduce to one, on certain degree, reduced the quantity of simulation control element like this, improved precision and reliability.
As shown in Figure 5, it is the digital PID control mode of core that DSP has been adopted in outer shroud control, mainly uses DSP control board module to realize making output valve to follow the tracks of and sets.Sampled voltage current signal (FV from the master board module, FI) be amplified into U10 (DSP) through amplifier U11A, U11B, U10 is divided into the continuous current signal according to the mode of operation of reality with voltage and current signal, the continuous voltage signal, pulse output voltage base value signal, pulse output voltage peak signal, pulse output current base value signal, pulse output current peak signal, and utilize set point separately to carry out the PID computing, thus calculate the control signal that needs output.Because DSP does not mostly possess DA conversion (digital-to-analogue conversion) function, convert analog signal to by DA transducer U8 and U5 and input to the master board module so be stored in the control signal of DSP inside.U8 and U5 are respectively as the base value of pulse output and the control signal of peak value, the modulation signal of pulse is then realized control output by the PWM of DSP inside, the control signal received of master board just has modulation signal to come high-speed transitions between base value signal and peak signal like this, cooperates to control based on the interior ring of master board module to export final pulse voltage and electric current again.When system was non-linear owing to unpredictable factor produces, DSP can be by manually setting the linearity that an offset improves power supply.
In addition, the enforcement of this programme be unable to do without the support of software systems, and most calculation process and precision control are all finished by software program.The running of software program is as follows:
As shown in Figure 6, behind the hardware circuit electrifying startup, the program in the DSP control board brings into operation.Begin to carry out the program of establishment in the DSP after the program running, at first carry out the initialization of system, system initialization mainly is to read some operational factors and the device and equipment of outside is carried out the initialization setting.
After finishing system initialization, begin to enter the main program circulation, whether in main program, at first will scan has button to press, if there is button to press, then enters button event and handles subprogram, then according to user's operation, preserves the parameter of change.Enter output mode determining program section then.
If there is not button to press, whether have knob regulate, if there is not knob to regulate, then directly carry out downwards if just beginning scanning.If adjusting is arranged, then enter knob and regulate the event handling subprogram, after being finished, preserve data change, enter power mode then and judge that mode of operation mainly contains two kinds: continuous output mode and pulse output mode.
Under continuous output mode, carry out outer shroud PID (ProportionIntegration Differentiation proportion integration differentiation) behind the sampling filter at once and control and carry out DA output.Under the pulse output mode, sampling filter will obtain the base value and the peak value of power supply output, but does not control output this moment.
Next judged whether that 1/4 second clock interrupts, if do not arrive, then forwards the beginning of main circulating program to.If to 1/4 second time, program continues to carry out downwards, begins to add up the output of ampere-hour and Control Node signal.
Program judges whether power supply is operated in continuous constant current output mode afterwards, if then the non-linear section that electric current is exported compensates, exports the pulse modulation control signal then.If not then directly exporting the pulse modulation control signal.
Continue then to judge power mode,, then calculating PID pulse output outer shroud control signal is set and comes the control impuls precision, and show that output is handled with the I/O mouth according to pulse if at pulsed output mode; If at continuous output mode, show directly that then output is handled with the I/O mouth, and so far return and finish major cycle.
This programme software algorithm mainly is based on PID, and the theoretical formula of PID is:
The form that is converted into the C language is: OUT=.P* (E0-E1)+I*E0+D* (E0-2*E1+E2), wherein OUT is that the output of PID is the deviation of controlled quentity controlled variable, P is a scale parameter, I is an integral parameter, D is a differential parameter, and E0, E1, E2 are respectively current sampling instant, a last sampling instant and go up system's departure of a sampling instant again.Program has entered into the mode of operation judgement after finishing the processing of initialization and key-press event, if carry out electric current and voltage A/D sampling at the next horse back of situation of output continuously, outer shroud control PID computing, threaten the safety of power tube for the sudden change that prevents the value of setting causes power to change suddenly, operation result carries out maximum and limits the gradual effect of changing that realizes power output.If power work is when pulse mode, system just carries out the sampling of base value electric current and voltage, the crest voltage current sample, and do not carry out the output of PID s operation control, mainly be because the frequency of pulse is lower, calculation process can make deviation increase at full speed on processor so at a high speed.Be to wait for that the 0.25s clock interrupts afterwards, in the clock break in service, we have finished the processing of ampere-hour meter, things such as nonlinear compensation processing and IO processing, next be exactly the PID output valve of calculation control pulse base value and peak value, why be put into is that this frequency has only the output pulse of 1kHz comparatively suitable for the highest because the computing frequency of this moment is interrupted the consistent 4Hz of being with the time here.
More than be the concise and to the point description of pulse accuracy control circuit for pulse power supply of the present invention and operating software flow process thereof.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. pulse accuracy control circuit for pulse power supply, it is characterized in that: this circuit comprises the DSP control board, master board, button display panel and Switching Power Supply main circuit board; Form the outer shroud control loop between DSP control board and the master board, master board adopts the PWM control technology to form interior ring control loop.
2. circuit as claimed in claim 1 is characterized in that: described Switching Power Supply main circuit board provides feedback signal, BLOCK signal and current limliting signal to master board.
3. circuit as claimed in claim 2 is characterized in that: loop control circuit comprises PWM controller, electric current and voltage sampling amplifying circuit, CPLD programmable chip, analog multiplexer and chip for driving in the described master board; Wherein, electric current and voltage feedback signal amplify through operational amplification circuit, pass through PWM modulation and the shaping of CPLD driving pulse again, drive signal is passed through the transformer coupled power tube of delivering to then, and exports adjustment accordingly according to current limliting signal and BLOCK soft-off signal.
4. the circuit of stating as claim 1, it is characterized in that: described DSP control board and button display panel, master board and Switching Power Supply main circuit board carry out respectively alternately; Wherein, the slow startup of DSP control board control main circuit, the start and stop of main circuit fan and speed governing, the exchange of RS-485 communication data, relay signal output, and power amplifier board temperature signal, the primary voltage accepted on the main circuit detect.
5. circuit as claimed in claim 1, it is characterized in that: the signal flow of described outer shroud control loop comprises, the DSP control board receives voltage, electric current and the anomaly detection signal of master board, and feed back base value setting, peak value setting and pulse-modulated signal, set up being connected of shows signal and control signal between master board and the button display panel simultaneously.
6. circuit as claimed in claim 5 is characterized in that: described outer shroud control loop is finished the base value of voltage, electric current and peak value by comparator and by the comparing element between the feedback signal of A/D sampling processing.
7. circuit as claimed in claim 6 is characterized in that: described comparator link comprises: continuous constant pressure compares, and constant current is compared continuously, and the pulse voltage base value compares, and crest value of impulse voltage compares, and the pulse current base value compares, and pulse current peak relatively.
8. circuit as claimed in claim 5, it is characterized in that: three outer increase control signals are controlled in the selected CV/CC control of three groups of analog multiplexers in the described DSP control board, output mode control, pulse modulation, and it is input to interior ring control loop as interior ring setting signal.
9. circuit as claimed in claim 1 is characterized in that, described DSP control board adopts pid control algorithm, and its operating procedure comprises:
A, each peripheral hardware of initialization read operational factor;
Whether b, scanning button display panel have button to press, and handle subprogram and execution in step c if having then enter button event, if not then carry out steps d;
C, according to user's operation, preserve the parameter of change, and enter step e;
Whether d, scanning have knob to regulate, if there is knob to regulate, then enters knob and regulate event handling subprogram and execution in step c; If do not have knob to regulate, then enter step e;
E, judge whether power mode is continuous output; If execution in step f then, if not execution in step g then;
F, to measuring the electric current and voltage effective value after the signal sampling filtering, carry out outer shroud PID control and DA output, and execution in step h;
The base value and the peak value of g, the output of sampling filter power supply, and execution in step h;
H, judged whether that 1/4 second clock interrupts, if do not arrive, then forwards the beginning of main circulating program to; If to 1/4 second time, then add up ampere-hour and carry out the output of Control Node signal, and execution in step i;
I, judge whether power supply is operated in continuous constant current output mode, if then the non-linear section of electric current output is compensated, and output pulse modulation control signal; If not then directly exporting pulse modulation control signal and execution in step j;
J, judge that whether power supply is at continuous output mode, come the control impuls precision if not then calculating PID pulse output outer shroud control signal being set according to pulse, show that output is handled with the I/O mouth,, and so far return and finish major cycle if then directly show and I/O mouth output processing.
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| CN201010128492A CN101800484A (en) | 2010-03-17 | 2010-03-17 | Pulse accuracy control circuit for pulse power supply |
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| CN201010128492A CN101800484A (en) | 2010-03-17 | 2010-03-17 | Pulse accuracy control circuit for pulse power supply |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436281A (en) * | 2011-11-04 | 2012-05-02 | 崔建勋 | Pulse power supply control system and method |
| CN104750002A (en) * | 2015-03-26 | 2015-07-01 | 中国科学院等离子体物理研究所 | FPGA based multi-way pulse feedback controller for PSM high-voltage power |
| CN105404204A (en) * | 2015-12-05 | 2016-03-16 | 中国航空工业集团公司洛阳电光设备研究所 | Control circuit of starting board of avionic device |
| CN106685377A (en) * | 2017-03-29 | 2017-05-17 | 烟台中正新技术有限公司 | Narrow pulse generation circuit and width-adjustable single pulse generator |
| CN107342675A (en) * | 2017-06-26 | 2017-11-10 | 北京无线电测量研究所 | A kind of digital power control, apparatus and system |
| CN109857037A (en) * | 2019-03-13 | 2019-06-07 | 武汉华中华昌能源电气科技有限公司 | A kind of control extensions for the pulse power |
-
2010
- 2010-03-17 CN CN201010128492A patent/CN101800484A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436281A (en) * | 2011-11-04 | 2012-05-02 | 崔建勋 | Pulse power supply control system and method |
| CN102436281B (en) * | 2011-11-04 | 2013-12-04 | 崔建勋 | System and method for pulse power supply control |
| CN104750002A (en) * | 2015-03-26 | 2015-07-01 | 中国科学院等离子体物理研究所 | FPGA based multi-way pulse feedback controller for PSM high-voltage power |
| CN105404204A (en) * | 2015-12-05 | 2016-03-16 | 中国航空工业集团公司洛阳电光设备研究所 | Control circuit of starting board of avionic device |
| CN106685377A (en) * | 2017-03-29 | 2017-05-17 | 烟台中正新技术有限公司 | Narrow pulse generation circuit and width-adjustable single pulse generator |
| CN106685377B (en) * | 2017-03-29 | 2024-01-26 | 烟台中正新技术有限公司 | Narrow pulse generating circuit and adjustable width single pulse generator |
| CN107342675A (en) * | 2017-06-26 | 2017-11-10 | 北京无线电测量研究所 | A kind of digital power control, apparatus and system |
| CN109857037A (en) * | 2019-03-13 | 2019-06-07 | 武汉华中华昌能源电气科技有限公司 | A kind of control extensions for the pulse power |
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Open date: 20100811 |