CN102857109A - High-power LLC (logical link control) resonant full-bridge converter based on DSP (digital signal processor) - Google Patents
High-power LLC (logical link control) resonant full-bridge converter based on DSP (digital signal processor) Download PDFInfo
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Abstract
The invention discloses a high-power LLC (logical link control) resonant full-bridge converter based on a DSP (digital signal processor). The high-power LLC resonant full-bridge converter comprises a main circuit and a control circuit, wherein the main circuit comprises a primary side rectification filter circuit, a MOSFET (metal-oxide-semiconductor field effect transistor) full-bridge conversion circuit, an LLC resonant network, a power conversion module and a secondary side rectification filter circuit which are connected in sequence; the power conversion module is composed of two power transformers; one end of the MOSFET full-bridge conversion circuit is connected with the primary side rectification filter circuit; the other end of the MOSFET full-bridge conversion circuit is connected with a resonant network; the resonant network is connected with the power conversion module; one end of the second side rectification filter circuit is connected with the power conversion module and the other end of the second side rectification filter circuit is connected with a load; the control circuit comprises a voltage sampling detection circuit, a current sampling detection circuit, a DSP digital control system and a MOSFET full-bridge drive circuit; one end of the voltage sampling detection circuit is connected with output of a power source; the current sampling detection circuit is connected in a loop of the secondary side rectification filter circuit in series; the DSP digital control system is connected with the MOSFET full-bridge drive circuit; and the MOSFET full-bridge conversion circuit is driven by the MOSFET full-bridge drive circuit. The high-power LLC resonant full-bridge converter based on the DSP has the advantages of simple operation, easiness in implementation of intelligentization and suitability for high-power output occasions.
Description
Technical field
The present invention relates to LLC resonant circuit technology, particularly a kind of high-power LLC resonance full-bridge converter based on DSP.
Background technology
Along with developing rapidly of switch power technology, high power density and high efficiency have become its development trend, and in this case, soft switch technique has obtained developing widely and using.The circuit topology that soft switch technique adopts is mainly by resonance type soft switch topological sum PWM type soft switch topology, and the resonance type soft switch technology since the advantages such as its efficient and high power density in the switch power technology application, obtained studying more widely and paying close attention to, LLC resonance full-bridge converter is as a kind of special circuit topology, can either satisfy the requirement of high frequency, can reach very high conversion efficiency again, it is constant by the Dead Time that keeps the upper and lower bridge arm switching tube, by-pass cock frequency is come regulation output voltage, realizes FR soft switch conversion.
Compare with other soft switch technique, LLC resonance full-bridge converter not only has primary side switching tube ZVS(no-voltage) open characteristic, can realize simultaneously the ZCS(zero current of secondary side rectifier diode) turn on and off and low requirement of withstand voltage, and its power down characteristic of holding time is relatively good, loss is low, and conversion efficiency is high.
But with regard at present for regard to the achievement in research of LLC resonance full-bridge converter, the problem that also has many preferential treatments to solve, particularly for the digital control resonant transformation core technology in the system, the problems such as the reliability of system, intellectuality and high power density output are all given preferential treatment to further solution.Prior art mainly has following defective:
(1) power output is little, and efficient is low, is difficult to realize high power density output.
(2) reliability is low, and control precision is low.
(3) integrated level is low, and consistency is poor, is difficult to realize standardization.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of prior art, the LLC resonance that a kind of precision based on the DSP Digital Control is higher, power stage is larger full-bridge converter is provided.This converter is by the quick computing of DSP total digitalization, realize the power conversion adjusting of high-speed, high precision, so that system stability and have good dynamic characteristic adopts the power transformer of two armature windings series connection secondary winding parallel connection to obtain more powerful output.
Purpose of the present invention is achieved through the following technical solutions: a kind of high-power LLC resonance full-bridge converter based on DSP is characterized in that: comprise main circuit and control circuit; Described main circuit is connected to form successively by primary side current rectifying and wave filtering circuit, MOSFET full-bridge circuit, LLC resonant network, power conversion module, secondary side current rectifying and wave filtering circuit, wherein, the power conversion module is comprised of two power transformers, two the former limit of transformer adopting windings in series, the mode of secondary winding parallel is shared through-put power, can obtain more powerful output.MOSFET full-bridge circuit one end is connected with the primary side current rectifying and wave filtering circuit, the other end is connected with resonant network, resonant network is connected with the power conversion module, and secondary side current rectifying and wave filtering circuit one end is connected with the power conversion module, and the other end is connected with load; Control circuit is comprised of electric current and voltage sample circuit, DSP Digitizing And Control Unit, MOSFET full bridge driving circuit, wherein, voltage sampling circuit is connected with the output of power supply, the other end is connected with the analog-to-digital conversion passage ADCIN0 of DSP, current sampling circuit is serially connected in the loop of secondary side current rectifying and wave filtering circuit, detection signal is connected with the analog-to-digital conversion passage ADCIN1 of DSP through the other end behind the differential amplification, the DSP Digitizing And Control Unit is connected with the MOSFET full bridge driving circuit, and the MOSFET full bridge driving circuit is connected with the MOSFET full-bridge circuit.
Above-mentioned LLC resonance full-bridge converter, described primary side rectification circuit is the full-bridge type current rectifying and wave filtering circuit.
Above-mentioned LLC resonance full-bridge converter, described MOSFET full-bridge circuit mainly is comprised of single-phase electricity die mould bridge conversion circuit.
Above-mentioned LLC resonance full-bridge converter, described power conversion module refers to the converter with two isolating transformers, the former limit of transformer adopting windings in series, the mode of secondary winding parallel.
Above-mentioned LLC resonance full-bridge converter, the resonant inductance of described LLC resonant circuit is added the leakage inductance sum of two isolating transformers for external resonant inductance independently, and magnetizing inductance is the magnetizing inductance sum of two isolating transformers.
Above-mentioned LLC resonance full-bridge converter, described secondary side current rectifying and wave filtering circuit refers to diode rectification and C filter circuit.
Above-mentioned LLC resonance full-bridge converter, described DSP Digitizing And Control Unit mainly is comprised of TMS320LF2407A chip and peripheral circuit thereof.
Above-mentioned LLC resonance full-bridge converter, described MOSFET full bridge driving circuit are mainly interconnected and are formed by pulsed drive transformer, MOSFET formula totem pushing structure.
Above-mentioned LLC resonance full-bridge converter, described voltage sampling circuit adopts non-isolated electric resistance partial pressure sampling, the voltage signal that sampling obtains carries out analog-to-digital conversion through the analog-to-digital conversion passage ADCIN0 that connects DSP control chip TMS320LF2407A after the filtering, DSP carries out the PI computing to the digital quantity that obtains, then control output respective drive pulse; Current sampling circuit employing serial connection shunt mode in power supply output major loop is sampled, the sampled signal that obtains is amplified through differential amplifier again and is carried out analog-to-digital conversion through the analog-to-digital conversion passage ADCIN1 that connects control chip TMS320LF2407A behind the electric resistance partial pressure, DSP carries out the PI computing to the digital quantity that obtains, then the frequency of respective drive pulse is exported in control, thereby realizes the constant voltage and current limiting pattern control to converter.
With respect to prior art, major advantage of the present invention is:
1, the present invention adopts the LLC resonance full-bridge converter of DSP total digitalization High-speed Control, and reliability is high, quick, accurate, efficient is high, simple in structure, volume is little, cost is low.
2, control core of the present invention adopts the totally digitilized harmonic technology of DSP control, and system upgrade is convenient, control circuit integrated level height, high conformity, is easy to standardization, intelligent degree height.
3, the present invention has adopted the digital Control Technology of feedback of voltage and current, and the dynamic characteristic of system is good, control precision is high, reliable and stable.
4, power conversion module of the present invention has adopted two power transformers, adopts former limit windings in series between the power transformer, and the mode of secondary winding parallel is exported more high-power, thereby obtains higher power density.
Description of drawings
Fig. 1 is overall structure block diagram of the present invention.
Fig. 2 is high-power LLC resonance full-bridge converter schematic diagram of the present invention.
Fig. 3 is MOSFET full bridge driving circuit schematic diagram of the present invention.
Fig. 4 is converter output voltage current sampling circuit schematic diagram of the present invention.
Fig. 5 is DSP control system modular structure block diagram of the present invention.
Fig. 6 is DSP control system schematic diagram of the present invention.
Fig. 7 is DSP control system program flow diagram of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
As shown in Figure 1, a kind of high-power LLC resonance full-bridge converter based on DSP comprises main circuit and control circuit.Main circuit is by primary side current rectifying and wave filtering circuit, MOSFET full-bridge circuit, LLC resonant network, former limit windings in series, power conversion module, secondary side current rectifying and wave filtering circuit that two power transformers of secondary winding parallel form connect to form successively, wherein, MOSFET full-bridge circuit one end is connected with the primary side current rectifying and wave filtering circuit, the other end is connected with resonant network, resonant network is connected with the power conversion module, secondary side current rectifying and wave filtering circuit one end is connected with the power conversion module, and the other end is connected with load; Control circuit is comprised of electric current and voltage sample circuit, DSP Digitizing And Control Unit, MOSFET full bridge driving circuit, wherein, voltage sampling circuit is connected with the output of power supply, the other end is connected with the analog-to-digital conversion passage ADCIN0 of DSP, current sampling circuit is serially connected in the loop of secondary side current rectifying and wave filtering circuit, detection signal is connected with the analog-to-digital conversion passage ADCIN1 of DSP through the other end behind the differential amplification, the DSP Digitizing And Control Unit is connected with the MOSFET full bridge driving circuit, and the MOSFET full bridge driving circuit is connected with the MOSFET full-bridge circuit.180 ° of the two-way phase phasic differences that the MOSFET full bridge driving circuit produces the DSP control system, duty ratio are fixedly amplified the high-voltage MOSFET of rear drive full bridge inverter system is carried out the control of output voltage electric current near 50% driving pulse PWM_1, PWM_2.The voltage and current signal of output feeds back to the DSP control system through behind the corresponding testing circuit, and control is to satisfy stability of a system requirement in real time.Wherein, the power conversion module is comprised of two isolated power transformers, C filtering is adopted in output, voltage sample detects and adopts non-isolation resistance dividing potential drop sampling, and the shunt (model is FLQ62-50A50mV) that current sample then adopts Yongming, Shanxi Electronics Co., Ltd. to produce is serially connected in and carries out current sample in the bus.
As shown in Figure 2, be the high-power LLC resonance full-bridge converter schematic diagram among the present invention, can see the direct voltage Vin that filter capacitor C1a is arranged after converter is input as rectification; The full-bridge that bridge inverter main circuit adopts high-voltage MOSFET V1a～V4a to form is used for driving rear class LLC resonant circuit; Resonant circuit comprises series resonance capacitor C r, series resonance inductor Lr(has comprised the leakage inductance sum of transformer T1a and the T2a of former limit windings in series) and magnetizing inductance Lm(comprise the magnetizing inductance sum of transformer T1a and the T2a of former limit windings in series), this moment, there were two resonance frequencys in resonant circuit, one is by resonant capacitance Cr, the first resonance frequency that resonant inductance Lr consists of
Another is by resonant capacitance Cr, resonant inductance Lr, the second resonance frequency that magnetizing inductance Lm consists of
Former limit drives signal and controls simultaneously respectively turning on and off of high-voltage MOSFET V1a, V4a and V2a, V3a, so that the staggered conducting of V1a, V4a and V2a, V3a, work in the PFM(frequency modulation(FM) in constant dead band) pattern, realize that the ZVS of high-voltage MOSFET V1a, V4a and V2a, V3a is open-minded; Circuit for power conversion adopts two former limit windings in series, isolating transformer T1a and the T2a of secondary winding parallel, and the parameter of these two transformers is consistent, when realizing the converter conversion and obtain more powerful output; Secondary employing fast recovery rectifier diode D1a, D2a and filter capacitor C2a carry out rectifying and wave-filtering, so that output obtains stable direct current output; Series connection shunt F1a samples to output current on the output bus of converter, and the current signal that sampling obtains is delivered to the DSP control system and carried out calculation process, and the real-time debug resonance frequency realizes the control of converter output current limiting.
As shown in Figure 3, be MOSFET full bridge driving circuit schematic diagram among the present invention.The totem pillar pushing structure that the former limit of drive circuit has adopted high speed MOSFET N1b～N4b to form can realize switching fast and strengthening driving power to driving pulse PWM_1 and the PWM_2 that the DSP control system sends over.The drive circuit secondary has adopted voltage-stabiliser tube D9b～D10b, D16b～D17b, D23b～D24b, D30b～D31b that driving pulse is carried out the voltage stabilizing clamper, with the too high damage converter of the driving pulse amplitude former limit translation circuit high-voltage MOSFET V1a～V4a that guarantees that process driving transformer T1b and T2b are converted to; Capacitor C 7b～C10b accelerates to drive to high-voltage MOSFET V1a～V4a, with eliminate as far as possible open that MOSFET the Miller effect constantly brings open the time-delay adverse effect; The repid discharge loop of D13b and V1b, D20b and V2b, D27b and V3b, D34b and V4b composition can along turn-off after the acceleration pulse of driving pulse turn-off time, be eliminated and turn-off the secondary conducting that moment MOSFET the Miller effect causes.
As shown in Figure 4, be converter output voltage current sampling circuit schematic diagram of the present invention.Voltage sampling circuit adopts non-isolation resistance R1c, the sampling of R2c dividing potential drop, and introduced a closed-loop zero network that is formed by R3c, C2c, increased dynamic responding speed, through being input to the ADCIN0 mouth of DSP control chip after the direct current signal process voltage-stabiliser tube D1c clamper of 3.3V that is less than or equal to 3.3V that obtains after the dividing potential drop, realize the A/D conversion by corresponding software again.The current sampling circuit utilization is connected on that series connection shunt F1a carries out the current signal sampling to output current on the output bus of converter, obtain comparatively clean, level and smooth direct current signal behind the small-signal process differential amplifier N1c that obtains on the shunt, and then its direct current signal carried out after the dividing potential drop filtering realizing the A/D conversion by corresponding software more again through being input to the ADCIN1 mouth of DSP control chip after the voltage-stabiliser tube D2c clamper of 3.3V.The feedback closed-loop control circuit that above-mentioned link consists of just can be realized the control of converter constant voltage and current limiting pattern.
As shown in Figure 5, be DSP control system modular structure block diagram of the present invention.This system has selected TMS320LF2407A as the DSP control chip, and its basic structure comprises driving pulse generation module, RS232/485 and CAN2.0B communication module, LCD LCD Display Interface Module, memory module RAM and Flash, digital I/O mouth, AD analog input.The analog signal that A/D samples is into delivered to the A/D ALT-CH alternate channel of DSP, and system realizes the A/D conversion by software algorithm, and output two-way PWM_1 and PWM_2 driving pulse carry out frequency modulation(FM) to main circuit.Control system also shows converter output voltage electric current in real time by the external LCD LCD MODULE, be connected with the outer monitoring system with host computer, CAN 2.0B by bus RS232/485, realize the communication between DSP control system and host computer and the outer monitoring system.
As shown in Figure 6, be DSP control system schematic diagram of the present invention.The inside comprises power transfer module TPS7333Q, the active crystal oscillator of system control chip TMS320LF2407A, 30MHz, storage chip IS61LV12816, RS232 bus driver MAX232ACPE and CAN bus driver PCA82C250.Wherein, power transfer module TPS7333Q with externally fed power supply+5V level conversion become system control chip TMS320LF2407A+the 3.3V level; TMS320LF2407A realizes that mainly the electric current and voltage of sampling is carried out A/D changes the row operation of going forward side by side, and the driving pulse according to operation values output corresponding frequencies drives the main circuit power MOSFET again, realizes frequency modulation control; The active crystal oscillator of 30MHz provides fundamental frequency for control chip, and chip internal obtains the 40MHz dominant frequency after through 1.33 times of frequencys multiplication; Storage chip IS61LV12816 mainly realizes LCD LCD MODULE data storage; Control system is carried out communication by bus driver MAX232ACPE and PCA82C250 and host computer and outer monitoring system, and is connected with outside LCD MODULE by IDE standard interface CN2, shows in real time the electric current and voltage of converter output.The core control strategy of control system is as follows, and the electric current and voltage sampled signal is delivered to inner A/D ALT-CH alternate channel by ADCIN0 and the ADCIN1 mouth of DSP control chip, carries out corresponding A/D conversion by software.The present invention has adopted digitlization PI control strategy, adopts the RTDX module of the software platform CCS2000 Integrated Development Environment of TI controller to carry out the adjustment of PI parameter.The value of obtaining was Vo after the average voltage Vout of filter output sampled through voltage sampling circuit, compare with built-in voltage set-point Vref again, again the voltage error signal that obtains is sent into driving pulse frequency adjustment link by voltage regulator, the driving pulse that obtains is adjusted the switching frequency of main circuit power MOSFET again, thus the output voltage of regulating system.The current signal that the shunt sampling obtains is Io through the value of obtaining behind the current sampling circuit, compare with built-in current set-point Iref again, enter compute mode as long as detect current regulator, control system enters constant current mode with regard to judging so, this moment, voltage-regulation was in open loop situations, and converter output enters constant current mode.The DSP algorithm of above-mentioned control strategy, adopted sliding-mode control, namely utilized the discontinuity of control action, so that system is switched between two control laws, system mode is slided along sliding-mode surface, thereby produce a kind of and original system without the new motion-sliding block of direct relation.According to the controller of this algorithm design, control system has good antijamming capability, satisfy the followability of converter voltage output, and workload-adaptability is strong, and the dynamic characteristic of system and static characteristic are all relatively good.
As shown in Figure 7, be DSP control system program flow diagram of the present invention.The software of design mainly is the control with output voltage and electric current of reading that realizes the AD transformation result, realizes that namely the fixing driving pulse of duty ratio produces, frequency modulation(FM), Waveform Control and the error protection of driving pulse.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation; can not assert that implementation of the present invention is confined to these explanations; the substitute mode that anyly do not deviate from the change done under Spirit Essence of the present invention and the principle, modification, substitute, combination, simplification etc. all should be equivalence all should be considered as belonging to the protection range that the present invention is determined by claims of submitting to.
Claims (9)
1. the high-power LLC resonance full-bridge converter based on DSP is characterized in that: comprise main circuit and control circuit; Described main circuit comprises primary side current rectifying and wave filtering circuit, MOSFET full-bridge circuit, LLC resonant network, power conversion module, the secondary side current rectifying and wave filtering circuit that connects successively, described MOSFET full-bridge circuit one end is connected with the primary side current rectifying and wave filtering circuit, the other end is connected with resonant network, resonant network is connected with the power conversion module, secondary side current rectifying and wave filtering circuit one end is connected with the power conversion module, and the other end is connected with load; Control circuit comprises voltage sampling circuit, current sampling circuit, DSP Digitizing And Control Unit and MOSFET full bridge driving circuit, described voltage sampling circuit is connected with the output of secondary side current rectifying and wave filtering circuit, the other end is connected with the DSP Digitizing And Control Unit, current sampling circuit is connected with the secondary side current rectifying and wave filtering circuit, described DSP Digitizing And Control Unit is connected with the MOSFET full bridge driving circuit, and described MOSFET full bridge driving circuit is connected with the MOSFET full-bridge circuit.
2. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: described primary side current rectifying and wave filtering circuit is the full-bridge type current rectifying and wave filtering circuit.
3. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: described MOSFET full-bridge circuit mainly is comprised of single-phase electricity die mould bridge inverter main circuit.
4. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: described power conversion module is the converter with two isolating transformers, described power conversion module comprises transformer, the former limit of described transformer adopting windings in series, the mode of secondary winding parallel.
5. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: the resonant inductance of described LLC resonant circuit is added the leakage inductance sum of two isolating transformers for external resonant inductance independently, and magnetizing inductance is the magnetizing inductance sum of two isolating transformers.
6. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: described secondary side current rectifying and wave filtering circuit refers to diode rectification and C filter circuit.
7. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: described DSP Digitizing And Control Unit comprises the TMS320LF2407A chip.
8. the high-power LLC resonance full-bridge converter based on DSP according to claim 1, it is characterized in that: described MOSFET full bridge driving circuit comprises interconnective pulsed drive transformer and MOSFET totem pushing structure.
9. the high-power LLC resonance full-bridge converter based on DSP according to claim 7, it is characterized in that: described voltage sampling circuit adopts non-isolated electric resistance partial pressure sampling, the voltage signal that sampling obtains carries out analog-to-digital conversion through input TMS320LF2407A chip after the filtering, DSP carries out the PI computing to the digital quantity that obtains, the frequency of control output respective drive pulse; Current sampling circuit employing serial connection shunt mode in power supply output major loop is sampled, the sampled signal that obtains is amplified through differential amplifier again and is carried out analog-to-digital conversion through input TMS320LF2407A chip behind the electric resistance partial pressure, DSP carries out the PI computing to the digital quantity that obtains, then the frequency of control output respective drive pulse.
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| CN103078524A (en) * | 2013-01-12 | 2013-05-01 | 华南理工大学 | Switching working frequency variable direct current power supply and control method for same |
| CN104914812A (en) * | 2015-04-13 | 2015-09-16 | 安徽师范大学 | Acquisition control method for LLC circuit |
| CN106329940A (en) * | 2016-11-07 | 2017-01-11 | 江南大学 | Double-transformer serial and parallel structure full-bridge LLC (logical link control) resonant converter |
| CN106452093A (en) * | 2016-12-15 | 2017-02-22 | 深圳市英威腾电气股份有限公司 | DC/DC converter |
| CN108274096A (en) * | 2018-03-20 | 2018-07-13 | 华南理工大学 | A kind of parallel great power welding power source system based on LLC resonant converter |
| CN108667336A (en) * | 2018-06-01 | 2018-10-16 | 南京国电环保科技有限公司 | bipolar pulse generator |
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Effective date of registration: 20170117 Address after: Pu Nan Cang Whampoa District of Guangzhou City, Guangdong Province, 510530 joint industrial park, Road No. 1, 3rd floor of building C Patentee after: Guangdong easy Power Technology Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: Huana Science and Engineering Univ. |