CN202918189U - Digital boost switching mode power supply device based on DSP - Google Patents
Digital boost switching mode power supply device based on DSP Download PDFInfo
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- CN202918189U CN202918189U CN 201220604101 CN201220604101U CN202918189U CN 202918189 U CN202918189 U CN 202918189U CN 201220604101 CN201220604101 CN 201220604101 CN 201220604101 U CN201220604101 U CN 201220604101U CN 202918189 U CN202918189 U CN 202918189U
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Abstract
The utility model relates to a switching mode power supply device, in particular to a digital boost switching mode power supply device based on a DSP. The switching mode power supply device comprises the DSP, a driving amplifier circuit, a Boost circuit, a sampling circuit, a signal conditioning circuit, a protective circuit and a button display circuit. The output quantity of the Boost circuit is collected by the sampling circuit and is amplified by the signal conditioning circuit and then enters the DSP, and the DSP generates PWM signals to drive a switch tube of the Boost circuit. When the output quantity of the switching mode power supply device exceeds the set value of the protective circuit, a feedback signal of the protective circuit commands the DSP to stop outputting PWM signals and then the system stops working. The switching mode power supply device adopts the DSP to control the output voltage and current on the basis of ADC sampling and PWM technologies in combination with PI algorithms, and the switching mode power supply device has the advantages of simple structure, quick response and high accuracy.
Description
Technical field
The utility model relates to a kind of switching power unit, especially a kind of digital step-up switching power supply based on dsp processor.
Background technology
The development experience of power supply linear stabilized power supply and two stages of Switching Power Supply.Linear stabilized power supply, the history that its development has been passed by decades, its designing technique are very ripe, and product stability is high, and ripple is little, and the interference and the noise that do not have Switching Power Supply to have.This power supply satisfies the requirement of many application scenarios, but a lot of shortcomings are arranged:
Bulky, weight is large, expends metal material; Efficient is very low, and the linear stabilized power supply efficient of general design only has about 85%, and the waste mass energy deviates from mutually with the theory of building a conservation-minded society; Because its operating frequency is power frequency, so filter capacitor need to be chosen very large capacity.
Linear stabilized power supply has so distinct shortcoming, efficient is low, volume greatly, heavy, along with the development of society more and more can not be satisfied people's demand, this just needs a kind of conversion efficiency high, the new device of small portable.
Because the DC/DC Switching Power Supply has high efficiency, the advantages such as high power density and high reliability are applied to the fields such as communication, computer, industrial equipment and household electrical appliance more and more widely.Switch power controller has experienced analog controller, Single-chip Controlling, and these controls have the limitation of frequency.And can overcome these defectives based on the switch power controller of DSP, and reach stable, high frequency, high-precision requirement, be the trend of current switch power controller development.
Analog control system has used the analogue devices such as operational amplifier, comparator, resistance, electric capacity in a large number, and cost is lower, but these devices in time with the variation of temperature, very easily produce temperature float, easily aging, thereby caused the unstable of system.Simultaneously owing to a large amount of these analogue devices that use, so that such control system has the shortcomings such as volume is large, power consumption is high.And such Control System Design just is difficult for change after finishing, and is unadjustable, causes it portable poor, can not realize multiple regulative mode.In a word, there are many shortcomings such as control precision is low, dynamic response is slow, parameter tuning is inconvenient, temperature drift is serious, wear out easily in actual applications in analog control circuit.
Single-chip Controlling is owing to used a plurality of control chips, and circuit more complicated, and the conversion of process multiple signal have increased signal delay, have limited the further raising of control precision and stability.The single-chip microcomputer operating frequency is lower simultaneously, and this also becomes switch power supply system to the bottleneck of high frequency, high accuracy future development.
The utility model content
Technical problem to be solved in the utility model is the deficiency for the above-mentioned background technology, and a kind of digital step-up switching power supply based on dsp processor is provided.
The utility model adopts following technical scheme for solving the problems of the technologies described above:
A kind of digital step-up switching power supply based on dsp processor comprises: dsp processor, drive amplification circuit, Boost circuit, sample circuit, signal conditioning circuit, protective circuit, button display circuit; Wherein:
The input termination dsp processor of described drive amplification circuit, the input of output termination Boost circuit;
The output of the input termination Boost circuit of described sample circuit;
The output of the input termination sample circuit of described protective circuit, output termination dsp processor;
The output of the input termination sample circuit of described signal conditioning circuit, output termination dsp processor;
Described button and display circuit connect dsp processor.
In described a kind of digital step-up switching power supply based on dsp processor, dsp processor is the TMS320F2806 chip.
In described a kind of digital step-up switching power supply based on dsp processor, the two-supply circuit power supply that the TMS320F2806 chip is comprised of TPS70151 chip and peripheral circuit thereof.
The utility model adopts technique scheme, has following beneficial effect: dsp processor takes full advantage of its inner powerful resource, output voltage, electric current is done PI control, has simplified circuit structure, and system responses is rapid, and control precision is high.
Description of drawings
Fig. 1 is the digital switch power supply hardware circuit diagram based on dsp processor.
Fig. 2 is each inside modules main element interface distribution map of digital switch power supply.
Fig. 3 is TMS320F2806 processor chips external power source module circuit diagram.
Fig. 4 is digital switch power supply half-bridge driven chip I R2104S peripheral circuit.
Fig. 5 is that voltage is 25V, scale parameter Kp=0.075, and voltage PI adjusts step response figure during integral parameter Ki=0.20625.
Fig. 6 is by the PWM moment signal acquisition of PI adjusting and the output voltage signal schematic diagram of load two ends oscilloscope AC coupled.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated:
A kind of digital step-up switching power supply based on dsp processor as shown in Figure 1 comprises: dsp processor, drive amplification circuit, Boost circuit, sample circuit, signal conditioning circuit, protective circuit, button display circuit.
The input termination dsp processor of drive amplification circuit, the input of output termination Boost circuit; The output of the input termination Boost circuit of sample circuit; The output of the input termination sample circuit of protective circuit, output termination dsp processor; The output of the input termination sample circuit of signal conditioning circuit, output termination dsp processor; Button and display circuit connect dsp processor.
In the digital step-up switching power supply based on dsp processor as shown in Figure 1, dsp processor has been selected the TMS320F2806 chip, display is 12864LCD, key circuit is 4 * 4 matrix keyboards, sample circuit has been selected the low resistance resistance of 0.04 ohm in DALE company, 3W, %1 precision, it is 25 amplifier AD620 that signal conditioning circuit has been selected gain, the drive amplification circuit is comprised of half-bridge driven chip I R2104S and peripheral circuit thereof, and the switching tube in the booster circuit has been selected IRF540N.
Each inside modules main element interface distribution map of digital switch power supply is as shown in Figure 2: the TMS320F2806 chip comprises ADC sampling module, PWM generation module, general purpose I/O interface, clock circuit and power circuit are the peripheral circuit of TMS320F2806 chip, and keyboard circuit and display are connected with the TMS320F2806 chip by the I/O interface.PWM obtains the driving signal of switching tube IGBT as the input signal of half-bridge driven chip, is worked when the gate pole of switching tube IGBT has the signal of driving by the Boost circuit that switching tube IGBT, energy storage inductor L, filter capacitor C, sustained diode form.The direct voltage of the input signal of booster circuit for processing through the pre-filtering circuit filtering, output end signal enters load circuit through the post-filtering circuit.Sample circuit has been selected low resistance resistance, gathers the voltage and current signal of load circuit output; Signal conditioning circuit sends the ADC sampling module to after the output signal of Acquisition Circuit is amplified.After output analog quantity after the ADC sampling module will amplify is converted to digital quantity, the digital quantity of electric current and voltage error is done PI control obtain new pwm signal.Protective circuit is in system's overvoltage, under-voltage, and output feedback signal is to the TMS320F2806 chip when overcurrent, undercurrent, and the TMS320F2806 chip produces interrupt signal, closes ePWM module output pwm signal, until voltage, electric current recover normal.
When setting input voltage V
InBe 12 ~ 18V, output voltage V
oBe 24-36V, output current I
oBe 50mA ~ 2A, circuit efficiency 90%, during output ripple 50mv, energy storage inductor L utilizes formula (1) to determine value.Boost inductance is according to the design of Limited Current pulsation minimum principle.Consider worst condition, power output is maximum, and input voltage is minimum.This moment, input current was maximum, and ripple is also maximum.
Wherein: D=1-V
In/ V
oSwitching tube operating frequency f
s=50kHz, I
o=2A.The parameter substitution is calculated, L 〉=45uH.Consider the input fluctuation and reduce magnetic hysteresis loss, get L=60uH.
By ripple, the maximum duty cycle of output voltage, output current, selecting filter capacitor C according to formula (2) is 550uF.
TMS320F2806 processor cores voltage 1.8V, I/O voltage 3.3V.
Power circuit adopts TPS70151 duplicate supply chip to realize as shown in Figure 3.Input voltage+5V, and input and output pin adopted 0.1 μ F capacitor filtering, eliminate power supply noise.Switching tube is selected IRF540N.IRF540N rated voltage and rated current reach respectively 100V and 33A, and conducting resistance only has 0.04 ohm, and the temperature of power shell itself is lower.Adopt special-purpose half-bridge driven chip I R2104S to drive.
Half-bridge driven chip I R2104S peripheral circuit is as shown in Figure 4: operating voltage selection+14V, bootstrap capacitor 0.1uF ceramic condenser.After TMS320F2806 did digital PI control to feedback voltage and electric current, output variable was adjusted the 2 pin input of IR2104S.3 pin SD signal Low level effectives, high-low pressure signal Ho, Lo forbade output when overvoltage, overcurrent or the system failure were provided.
The TMS320F2806 chip that Texas Instruments produces provides enhancement mode peripheral module ePWM module, can take the pulse output that produces complexity in the very little cpu resource situation, can be according to concrete application programming setting.12 ADC sampling modules have 16 passages in the sheet, analog input voltage 0 ~ 3V, and the sampling bandwidth can reach 12.5MSPS.Numerous GPIO pins with multiplexing function can come the option and installment concrete function by the GPIOMUX register.Clock frequency is produced by outside 10MHz crystal and be operated in 100MHz behind inner frequency multiplication of phase locked loop.
The GPIO10-GPIO13 of TMS320F2806 chip, GPIO30-GPIO33 totally 8 IO complexing pins as the LCD line D0 ~ D7 that reads and writes data, definition LCD_BUS structure and D0 ~ D7 member variable.Here 12864 adopt the ST7290 controller.GPIO14, GPIO15, GPIO27 control as the LCD read-write sequence.4 * 4 keyboards pass through KeyColumnScan(Void by GPIO20-23, GPIO8-9, GPIO16-17 control), KeyRowScan (void) function identifies key value.GPIO19 is as the buzzer input control, and sound is pointed out when having button to press.For satisfying AD converter requirement in the TMS320F2806 sheet, current sampling resistor uses that 0.04 ohm in DALE company, 3W, voltage ratio are 1/15, precision is the low resistance resistance of %1, flows through the 1A electric current and can produce the 40mV pressure drop.Signal conditioning circuit adopts and does 25 times of amplifications with instrument amplifier AD620, obtains 1V/1A current sampling relation, such 0 ~ 3A output current correspondence, 0 ~ 3V sampling output voltage.
To do the test of voltage adjustment test and adjustment of load based on the digital booster switcher power supply material object of dsp processor, it is as shown in table 1 that digital boosted switch supply voltage is adjusted test result, and it is as shown in table 2 that digital boosted switch power source loads is adjusted test result.Select the equipment such as Tektronix TDS1012B-SC oscilloscope, GPS4303C power supply, capacitor and inductor table, millivoltmeter to the test of Boost numeral boosted switch power control system.Adjust input voltage and between 18 ~ 24V, change, record different input voltages and output setting voltage Relations Among.Power system voltage regulating characteristic when table 1 has provided setting 30V output.As can be seen from Table 1, along with input voltage increases, actual output voltage and setting voltage error progressively reduce.When input voltage 18V, the output error 170mV of system; When 21V voltage was inputted, system's output tended towards stability near 30V, and error is in 40mV.In whole permission input voltage range, voltage regulation is 0.5%, here load set 2A.Table 2 has provided voltage constant output 30V, load characteristic result when load current changes between 0.2 ~ 2A.Adopt the test of 250W-10 ohm porcelain dish slide-wire rheostat, be connected in series ammeter in the loop, millivoltmeter connects the load two ends.Rotation porcelain dish rheostat handle, the output of record different loads system.As can be seen from Table 2, load current is when 0.5 ~ 1.45A, and output voltage error is less than 60mV, and when load approached fully loaded 2A, error added about 350mV.Load regulation 1.1%.
Table 1
Table 2
The PI control strategy PI control of adopting integration to separate based on the output voltage of the digital booster switcher power supply of dsp processor and Current Control.Scale parameter is very large on the system dynamic characteristic impact.Fig. 5 has provided voltage setting 25V under the CCS2.2 translation and compiling environment, scale parameter Kp=0.075, and voltage PI adjusts step response during integral parameter Ki=0.20625.Because limited space in the F2806 sheet, during the ram in slice debugging, then front 256 sampled voltage values of feedback that the definition space storage voltage is adjusted in RAML1 observe in graph.Abscissa record unit is sample among the figure, and each switch periods record once.Press switching frequency 50kHz and calculate, dynamically the adjustment time is approximately 73 sampled points, about 1.46ms in system.Maximum overshoot 29.4V output appears about 0.7ms.Fig. 6 has recorded PWM moment signal acquisition that a route PI of F2806 processor ePWM2 output regulates and the output voltage signal of load two ends oscilloscope AC coupled.At the rising edge of each switch, obvious switching noise has all appearred in pwm signal and output voltage AC coupled signal.Open oscilloscope 20MHz limit bandwidth.Probe switches to * and 1 grade, and the electric capacity of 10uF and 0.1uF is to output voltage ripple test, in the input/output bound that system allows, output voltage ripple is less than 35mV.
In sum, the utility model adopts dsp processor, and based on ADC sampling and PI control algolithm, digital step-up switching power supply design has been finished in real-time adjustment step-up switching power supply output.Test result shows: system's man-machine interface is friendly, and easy to operate, control precision is higher, and dynamic response is fast.Have good technology and unexpectedly strive advantage, cost is low and antijamming capability is strong.
Claims (3)
1. the digital step-up switching power supply based on dsp processor is characterized in that: comprise dsp processor, drive amplification circuit, Boost circuit, sample circuit, signal conditioning circuit, protective circuit, button display circuit; Wherein:
The input termination dsp processor of described drive amplification circuit, the input of output termination Boost circuit;
The output of the input termination Boost circuit of described sample circuit;
The output of the input termination sample circuit of described protective circuit, output termination dsp processor;
The output of the input termination sample circuit of described signal conditioning circuit, output termination dsp processor;
Described button and display circuit connect dsp processor.
2. a kind of digital step-up switching power supply based on dsp processor according to claim 1 is characterized in that described dsp processor is the TMS320F2806 chip.
3. a kind of digital step-up switching power supply based on dsp processor according to claim 2 is characterized in that the two-supply circuit power supply that described TMS320F2806 chip is comprised of TPS70151 chip and peripheral circuit thereof.
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| CN 201220604101 CN202918189U (en) | 2012-11-15 | 2012-11-15 | Digital boost switching mode power supply device based on DSP |
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| CN 201220604101 CN202918189U (en) | 2012-11-15 | 2012-11-15 | Digital boost switching mode power supply device based on DSP |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946191A (en) * | 2012-11-15 | 2013-02-27 | 无锡商业职业技术学院 | Digital boost switching mode power supply device based on DSP (digital signal processor) |
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2012
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946191A (en) * | 2012-11-15 | 2013-02-27 | 无锡商业职业技术学院 | Digital boost switching mode power supply device based on DSP (digital signal processor) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20141115 |
|
| EXPY | Termination of patent right or utility model |