CN101562401B - Three-phase intermediate frequency power supply - Google Patents
Three-phase intermediate frequency power supply Download PDFInfo
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- CN101562401B CN101562401B CN2009101039741A CN200910103974A CN101562401B CN 101562401 B CN101562401 B CN 101562401B CN 2009101039741 A CN2009101039741 A CN 2009101039741A CN 200910103974 A CN200910103974 A CN 200910103974A CN 101562401 B CN101562401 B CN 101562401B
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Abstract
The invention discloses a three-phase intermediate frequency power supply. The standard voltage of a three-phase external electric network with 380V/50Hz is input to an industrial frequency transformer after passing through a three-phase fuse, an input contactor and an anti-electromagnetic interference filter, then is input to a three-phase rectifier after isolation and voltage reduction and then is filtered through a constant K type inverted-L-shaped L second-order low-pass filter and a constant K type inverted-L-shaped C second-order low-pass filter after being rectified by a bridge rectifier to obtain the operating direct-current voltage of a major loop; and the direct-current voltage is transmitted to an IGBT switching tube in a high-power conversion module, an auxiliary power supply is used for supplying power for a control loop to generate intermediate frequency as well as an IGBT pulse width modulation control signal, the IGBT switching tube is driven, the direct-current voltageis converted into three-phase intermediate frequency voltage, isolation, integration and regulation are performed on the three-phase intermediate frequency voltage through an output intermediate freq uency transformer, and filtering is performed through the second-order low-pass filter to obtain the standard three-phase intermediate frequency sinusoidal voltage output. The three-phase intermediatefrequency power supply overcomes the defects of complex control and driving of intermediate frequency power, excessive high power loss, low efficiency, poor wave-shape, unstable frequency and poor re liability as the traditional intermediate frequency power supply adopts serially connected regulating transistors for voltage regulation or adopts a bipolar transistor, an SCR thyristor and a GTO thyristor as the main power tubes.
Description
Technical field
The present invention relates to the intermediate frequency power supply that a kind of industrial circle uses, be specifically related to a kind of high stable three-phase intermediate frequency power supply that is applicable to fields such as Aero-Space, traffic, scientific research, military communication, household electrical appliances electronics, automobile making and health care.
Background technology
Intermediate frequency power supply is widely used in fields such as Aero-Space, traffic, scientific research, military communication, household electrical appliances electronics, automobile making and health care.At present, be widely used in the intermediate frequency power supply of industrial circle, much adopt the mode of intermediate frequency unit, the intermediate frequency unit, equipment is huge, and voltage, frequency instability are safeguarded because of difficulty.And along with the development of technology and the appearance of high power device, traditional intermediate frequency unit has been abandoned by a lot of intermediate frequency power supply systems, adopts advanced high power device, with lower medium frequency inverter FREQUENCY CONTROL switching tube, obtains voltage of intermediate frequency.But in present product, traditional three-phase intermediate frequency power supply mainly contains following two kinds: as shown in Figure 1, a kind of is to adopt bipolar transistor as adjusting pipe, and the series voltage-regulating working method adopts bipolar transistor as main power tube, the shortcoming of its existence is to adjust pipe to must operate at linear zone, power loss is excessive, control, driving complexity, and efficient is not high, waveform is not good, the frequency instability, overload capacity is poor, poor reliability.As shown in Figure 2, be the another kind of three-phase intermediate frequency power supply that uses at present, employing SCR thyristor is as main power tube, and the shortcoming of existence is to adopt thyristor control, exists to drive complexity, and efficient is not high, and waveform is not good, frequency instability, defectives such as poor reliability.And, more than the generation of traditional intermediate frequency power supply IF-FRE, major part will rely on RC oscillator or L, R, C self-resonance vibration to produce, the frequency instability of generation, and be easy to change along with the variation of ambient temperature.
Summary of the invention
Intermediate frequency power supply above shortcomings at prior art, the purpose of this invention is to provide a kind of employing IGBT (Insulated Gate Bipolar Transistor insulated gate bipolar power tube) high-power component, and utilized photoelectricity isolation drive, pwm pulse to transfer a kind of three-phase intermediate frequency power supply wide and design of PID closed-loop adjustment control technology.
The object of the present invention is achieved like this: a kind of three-phase intermediate frequency power supply, its major loop insert the normal voltage of three-phase 380V/50Hz from external power grid; Voltage is through three-phase fuse, input contactor, anti-emi filter, be input to Industrial Frequency Transformer, behind isolated buck, be input to three-phase rectifier, behind bridge rectifier,, obtain the operation DC voltage of major loop by normal K type two elements Γ type L, the filtering of C second-order low-pass filter; This direct voltage is sent into IGBT switching tube in the three-phase bridge medium-frequency transformation module, be the control loop power supply by accessory power supply simultaneously, generate IF-FRE and produce IGBT Pulse Width Modulation Control With signal, driving IGBT is the three-phase voltage of intermediate frequency with dc voltage conversion, by the output intermediate frequency transformer three-phase voltage of intermediate frequency is isolated, integrated and adjusts, through second-order low-pass filter filtering, obtain required standard three-phase intermediate frequency sinusoidal voltage and output again.
Further feature, in control loop, adopted quartz crystal ring oscillator, digital frequency division method, numeral divide phase method, pwm pulse transfer width controlling method, PID closed-loop adjustment control method, photoelectrical coupler and imported, under-voltage delay switching-off and start automatic time delay output circuit.
With respect to prior art, the present invention has following remarkable advantage:
1, adopt insulated gate bipolar transistor IGBT as main power conversion device, utilize the IGBT high-power component to form the bridge-type high-power amplifying circuit, main circuit voltage is carried out the DC/AC conversion, have the advantage that break-make speed is fast, input impedance is high, drive circuit power is little and capacity is big and blocking voltage is high.
2, in major loop, adopt anti-emi filter that electromagnetic interference and the intermediate frequency power supply inside of electrical network to intermediate frequency power supply is isolated the Conducted Electromagnetic Interference of electrical network, utilize the magnetic coupling characteristic of Industrial Frequency Transformer, realize the electrical isolation of externally fed and power supply inside, utilize normal K type two elements Γ type L, the C second-order low-pass filter carries out filtering to the input waveform, the power work main circuit voltage is provided, adopt intermediate frequency transformer that power supply major loop and output loop are realized the magnetic isolation, adopt second-order low-pass filter that the intermediate frequency square wave is filtered into middle frequency sine-wave, by modularized design, make the versatility of product, interchangeability, maintenanceability is strengthened, and has improved the stability of power work, reliability and antijamming capability.
3, in control loop, adopt respectively quartz crystal ring oscillator, digital frequency division method, numeral divide phase method, pwm pulse transfer width controlling method, PID closed-loop adjustment control method, photoelectrical coupler and imported, under-voltage delay switching-off and start automatic time delay output circuit; defencive function to power supply is complete; the power output surplus is very big; the Adjustable Output Voltage wide ranges; output frequency also can be set up as required; versatility is extremely strong; has high stability; power consumption is little, reliability is high, and maintenance cost is low.
Description of drawings
Fig. 1 is the circuit theory diagrams that cast three-phase intermediate frequency power supply is adjusted in existing series connection;
Fig. 2 is the circuit theory diagrams of existing thyristor-type three-phase intermediate frequency power supply;
Fig. 3 is the circuit block diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Fig. 4 is the circuit theory diagrams of a kind of three-phase intermediate frequency power supply of the present invention;
Fig. 5 is the control loop circuit block diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Fig. 6 is the control loop circuit theory diagrams of a kind of three-phase intermediate frequency power supply of the present invention;
Fig. 7 is the quartz crystal oscillator circuits schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Fig. 8 is the digital divider circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Fig. 9 is the digital phase splitter schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 10 is the pwm pulse width adjusting control circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 11 is ratio, integration, differential (PID) the closed loop regulation circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 12 be a kind of three-phase intermediate frequency power supply of the present invention recommend zero passage control circuit schematic diagram;
Figure 13 is the starting impulse lock-in circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 14 is the driving loop circuit block diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 15 is the driving loop circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 16 is the three-phase optical coupling isolated drive circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 17 is the transient pulse current detecting protective circuit schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 18 is the feedback loop circuitry schematic diagram of a kind of three-phase intermediate frequency power supply of the present invention;
Figure 19 is the input of a kind of three-phase intermediate frequency power supply of the present invention, under-voltage delay switching-off and start automatic time delay output circuit schematic diagram.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of three-phase intermediate frequency power supply disclosed by the invention, its circuit block diagram is seen Fig. 3, mainly form by principal voltage loop, pwm pulse width adjusting control loop, driving loop, feedback loop, accessory power supply loop, protection loop six parts, its circuit theory diagrams are seen Fig. 4, major loop part wherein, utilize anti-electromagnetic interference " EMI " filter, electromagnetic interference and the intermediate frequency power supply inside of electrical network to intermediate frequency power supply is isolated the Conducted Electromagnetic Interference of electrical network;
The present invention utilizes the magnetic coupling characteristic of Industrial Frequency Transformer, realizes the electrical isolation of externally fed and power supply inside and finish voltage ratio changing;
Utilize three-phase bridge rectifier that the three-phase 380V/50Hz alternating voltage of input is carried out rectification;
Utilize LC low pass second order filter that the input waveform is carried out filtering, the power work main circuit voltage is provided;
Utilize state-of-the-art now IGBT high-power component to form the three-phase bridge high-power amplifying circuit, main circuit voltage is carried out the DC/AC medium-frequency transformation, traditional three-phase intermediate frequency power supply generally adopts high-power bipolar transistor (BJT), common controllable silicon (SCR), turn-off SCR (GTO), power field effect pipe (MOSFET), above power device has drive circuit or complexity, poor reliability, voltage, it is not enough that electric current holds nargin, input impedance is not high, switching speed is not enough, different many shortcomings that loss is excessive or the like, the igbt (IGBT) that the present invention adopts, it is the hybrid power device of MOSFET and bipolar power transistor, be up-to-date in the world now, state-of-the-art power conversion device, it is fast that it had both had the break-make speed of MOSFET, the input impedance height, drive circuit requires advantages such as power is little, big and the high advantage of blocking voltage of capacity that has high-power bipolar transistor again, extensively replace BJT in the present highly reliable power supply, SCR, GTO, MOSFET is as main power conversion device;
Utilize the three-phase intermediate frequency transformer to realize that power supply major loop and output loop magnetic coupling are isolated and voltage ratio changes;
Utilize the middle frequency sine-wave of three-phase star resonator, offer load the waveform standard of filtering into of medium-frequency transformation.
Referring to Fig. 5, the control loop of the three-phase intermediate frequency power supply that the present invention relates to, mainly by quartz oscillator, cmos digital frequency division, CMOS three-phase ring distributor, the control of pwm pulse width adjusting, PID adjuster, recommend several parts such as zero passage control, starting impulse locking and form.Its control loop circuit theory diagrams are seen Fig. 6, and main the generation according to feedback signal carried out 6 road three-phase pulse control signals that PWM regulates.
Among the present invention, the IF-FRE production method of design is different from RC resistance, electric capacity oscillator method that existing intermediate frequency power supply generally adopts, and R, C oscillator have R, C discrete parameter big, too big with temperature drift, directly influence the significant drawback of the stability of IF-FRE.The method that IF-FRE of the present invention produces is seen Fig. 7, quartz oscillator G1 high by precision, that temperature coefficient is minimum and cmos nand gate N2 looping oscillator, again by the high frequency square wave that produces frequency stabilization after the not gate N3 shaping, whole waveform generation is controlled by not gate N1, there is not the problem of R, C oscillator in quartz oscillator, its frequency stability directly depends on the performance of crystal oscillator, so this intermediate frequency power supply frequency stability is at least 10
-5The order of magnitude.
The digital frequency division method of the present invention design referring to Fig. 8, utilizes special-purpose cmos digital frequency divider U1, U2 to finish 400Hz intermediate frequency frequency division, has simple in structurely, and frequency division is accurate, the precision height, and good stability does not need characteristics such as debugging.This digital dividing method, be different from traditional simulation dividing method, traditional simulation dividing method, the required components and parts of three-phase frequency dividing circuit are numerous, and structure is too complicated, the frequency division precision is inaccurate, the resolution element parameter discrete is big, and temperature is floated seriously, the incompatibility high-precision requirement, it is also very difficult to produce debugging, and maintenance cost is higher.
The numeral of the present invention's design is divided phase method, referring to Fig. 9, adopt special-purpose three-phase pulse ring distributor U3, to the single-phase 400Hz square wave of input, carry out 120 ° of phase-splittings of three-phase, again by buffer N8, N9, N10 buffer compartment from after, the 400Hz intermediate frequency square wave that output three-phase mutual deviation is 120 °, the design's method is simple in structure, the phase-splitting phase place is accurate, the precision height, good stability does not need debugging.The method, be different from traditional simulation three-phase and divide phase method, traditional simulation three-phase divides phase method, adopts discrete device, required components and parts are numerous, complex structure, the phase-splitting precision is inaccurate, and the discrete component parameter discrete is big, temperature is floated seriously, 120 ° of requirements of incompatibility high accuracy phase shift, the production debugging is also very difficult, and maintenance cost is very high.
The pwm pulse width adjusting control method of the present invention's design, referring to Figure 10, from the two closed loop voltages of the three-phase intermediate frequency of output, the current instantaneous value sampling, PID directly feeds back to pwm pulse and transfers wide control assembly N15 after regulating, N17, N18 is by continuous detection output voltage, the variation of electric current, compare with the three-phase 400Hz intermediate frequency square wave of standard, PWM through control assembly regulates the duty ratio of the direct by-pass cock pipe of real-time three synchronised switching pulse square wave, regulated output voltage, circuit is simple, switching tube is operated on off state, and power consumption is little, and required components and parts are few, the power-efficient height, the reliability height, the production debugging cycle is short, and maintenance cost is low.
Aforesaid pwm pulse width adjusting control method is different from the univoltage feedback system that traditional three-phase intermediate frequency power supply adopts.Traditional three-phase intermediate frequency power supply generally only adopts the output voltage feedback sample, adjusts the mode of high-power adjustment transistor or thyristor with reference voltage comparison, amplification, high frequency linearity, regulated output voltage, this kind regulative mode, control circuit is very complicated, drive circuit is also very complicated, and instantaneous regulating power is very poor, and power supply overload capacity is poor, and the adjustment pipe range phase is operated in linear zone, very easily damage, power consumption is big, and thyristor control time of afterflow is long, and waveform is bad, power-efficient is low, reliability is low, and the production debugging cycle is long, and maintenance cost is very high.
Ratio, integration, differential (PID) the closed-loop adjustment control method of the present invention's design, see Figure 11, by output voltage and electric current instantaneous sampling, at first by N21 the feedback superposed signal being carried out integration regulates, signal after by N20 integration being regulated again carries out ratio, differential is regulated, strengthen whole power-supply system closed loop phase place and hold nargin, increase the stability of a system, after the feedback superposed signal is carried out integration, differential, ratio adjusting, determine the voltage stabilizing regulated quantity, the switching pulse duty ratio of control high-power switch tube IGBT, regulated output voltage.And the univoltage feedback operation mode that traditional three-phase intermediate frequency power supply adopts, directly three-phase voltage sampling, error is amplified, with benchmark relatively, control switch pipe switch again, the whole system instability, instantaneous regulating power is poor, dynamic response is slow, inaccurate.
The present invention design recommend the zero passage control method; see Figure 12; when IGBT control waveform zero passage; utilize the U4 device; automatically add a delay time gap; the IGBT high power valve has effectively been protected in not conducting simultaneously or end of the switching tube of IGBT up and down that guarantees to form in the three-phase bridge medium-frequency transformation each bridge.And the push pull mode that traditional three-phase intermediate frequency power supply adopts, during high power valve IGBT control waveform zero passage, the same bridge IGBT of three-phase bridge medium-frequency transformation manages easy while conducting up and down or ends, and causes the damage of IGBT high power valve.
The starting impulse locking means of the present invention's design, see Figure 13, complete machine power initiation moment, control system, the fixed voltage that forms by resistance among the figure, capacitor is recommended the zero passage control signal with three-phase and is synthesized by U5, U6, U7, form the fixed width pulse, being divided into 6 field effect transistor that reach the back mutually by U8 again promotes, output is given through 6 road three-phase pulse control signals of pwm pulse width adjusting and is driven the loop, drive the IGBT switching tube again and be in set duty ratio state of a control, effectively avoided the damage of switching tube.And traditional three-phase intermediate frequency power supply starts moment, because adjustment pipe or switching tube are in off state, will bear too high instantaneous voltage, very easily causes adjustment pipe or switching tube to damage.
The three-phase optical coupling isolation drive loop circuit block diagram of the present invention's design is seen Figure 14, mainly form by three-phase optical coupling isolation high-speed driver, transient state over-current detector, it drives the loop circuit principle referring to Figure 15, mainly 6 road three-phase PWM pulse width modulation control signals of prime are carried out photoelectricity isolation, power amplification, finish the flashlight electrical transmission and the power amplification of control weak current part and high-power conversion strong power part, effectively drive high-power conversion IGBT switching tube.
The three-phase optical coupling isolation drive method of the present invention's design, see Figure 16, adopt extraordinary photoelectricity mixing integrated high-speed drive circuit N22, N23, N24, N25, N26, N27 carries out photoelectricity to 6 road three-phase PWM pulse width modulation control signals of prime to be isolated, power amplification, finish the flashlight electrical transmission and the power amplification of control weak current part and high-power conversion strong power part, the dielectric voltage withstand P-P value of its extraordinary photoelectricity mixing integrated high-speed driver is up to 5000V, circuit has the power drive ability up to 300A simultaneously, it is very big to make whole power-supply system drive allowance, has effectively avoided the main power section forceful electric power that the conventional power source direct drive mode causes and the serious problems of the chain damage of control section light current.And the driving element of traditional three-phase intermediate frequency power supply power tube directly is electrically connected with control section, if power section is damaged, input, output high-pressure section will directly feed back to the prime control section, causing control, weak current part is chain blows up, comprise that the driver of international rectifier IR company all has above problem now, cause whole power-supply system to damage, fault enlarges, and equipment has very big potential safety hazard.
The transient pulse current detecting guard method of the present invention's design; see Figure 17; utilize the transient pulse electric current of fast detector assembly U9, U10, U11, U12, U13, instant online all the IGBT power devices of direct detection of U14; compare with the drive signal of power device simultaneously; surpass the anti-overcurrent of the limit of IGBT power device during the time when detecting transient current; the intermediate frequency power supply power device is in time protected in the soft shutoff of the automatic power controlling device of overcurrent fast detector reliably.And traditional three-phase intermediate frequency power supply often adopts current transformer spare or resistance sampling that the output overcurrent of power supply is detected, feed back to control section then, hard switch-off power device or power input part branch, detection speed is too slow, the dv/dt of power device changes too fast, under a lot of situations, when waiting current control to realize, the power capability device damages already.
Feedback loop is seen Figure 18, and traditional three-phase intermediate frequency power supply feedback loop generally adopts the univoltage feedback system, and feedback speed is too slow, when load current changes, can not in time follow the tracks of the duty cycle of switching of adjusting power tube, causes output voltage to descend or rising.Is connected by the output cable between the traditional three-phase intermediate frequency power supply, power supply and load, if the output distance is far away, then during heavy load work, can produces big pressure drop on the output cable, reality may not reach setting to the magnitude of voltage in the load.
The voltage of the present invention's design, the current double closed-loop instantaneous value is regulated and long-range output voltage compensation is regulated the FEEDBACK CONTROL regulation technology, while applied voltage transducer, current sensor is with this machine output voltage of intermediate frequency power supply, current feedback is to synthesizer U15, U15 simultaneously grows up to be a useful person the change in voltage telepresence bout of intermediate frequency power supply load end, three kinds of feedback signals superpose simultaneously, constitute the closed loop feedback system of whole intermediate frequency power supply, real-time regulated is carried out in output to power supply jointly, has effectively solved the long long-range output voltage problem on the low side that causes of real-time regulated and supply line of intermediate frequency power supply output.
Input, under-voltage delay switching-off and the start automatic time delay output circuit of the present invention's design; referring to Figure 19, special time delayed turn-off function is adopted in the input of design, under-voltage protection; when external power grid voltage surpasses the power settings reference voltage value; U17 delaying time of controller 15s output overvoltage/undervoltage guard signal turn-offs intermediate frequency power supply, if in the stipulated time; it is normal that external power grid voltage recovers; then do not produce the overvoltage/undervoltage guard signal, power supply can operate as normal, does not influence the work of load equipment.Input, under-voltage protection that traditional three-phase intermediate frequency power supply has, often when external power grid one took place, under-voltage, power supply promptly moves shutoff, when external power grid has large-scale miscellaneous equipment open and close machine, the intermediate frequency power supply misoperation of shutting down easily.
Traditional three-phase intermediate frequency power supply does not have start automatic time delay output protection; when intermediate frequency power supply connects load equipment for a long time; when power supply just starts; moment is just connected load equipment in start; voltage to power supply itself establishes influence, and the unstable voltage of start moment output will to after connect load equipment and produce and impact, might damage load equipment; potential safety hazard is arranged, and the erratic current of start moment output will very easily damage the high power device IGBT of power supply.
The start automatic time delay output circuit of the present invention's design, no-output voltage when intermediate frequency power supply is started shooting, after reaching set point 3s, intermediate frequency power supply voltage is set up fully, the automatic time delay output circuit of starting shooting this moment is sent start automatic time delay output signal, intermediate frequency power supply just begins outputting standard intermediate frequency operating voltage, and the unstable voltage that has effectively prevented start moment output has guaranteed that to load equipment and to the impact of power supply self intermediate frequency power supply itself reaches the safe in utilization of load equipment.
Every type approval tests such as a kind of three-phase intermediate frequency power supply of the present invention has passed through that low temperature, high temperature, alternation are damp and hot, vertical vibration, transverse vibration, extensional vibration, top shake, electromagnetic compatibility; its output voltage and output frequency are highly stable; the distortion factor is little; defencive function is complete; the reliability height, the power output surplus is very big, the Adjustable Output Voltage wide ranges; output frequency also can be set up as required, and versatility is extremely strong.
To sum up, a kind of three-phase intermediate frequency power supply of the present invention, it is to utilize the IGBT high-power component, adopts photoelectricity coupling isolation drive, pwm pulse width adjusting and ratio, integration, differential (PIP) adjusting, voltage, current double closed-loop instantaneous value to regulate control technology and develop.It has overcome traditional intermediate frequency power supply and has adopted adjustment pipe series voltage-regulating, perhaps adopt bipolar transistor, SCR, GTO thyristor as main power tube, the intermediate frequency power supply control, the driving that are caused are complicated, power loss is excessive, efficient is not high, waveform is not good, frequency instability, many shortcomings of poor reliability or the like.Emphasis has been strengthened components and parts, choices of raw materials in design, has implemented Allowance Design, design of Reducing Rating and electromagnetism Design of Reinforcement, has improved stability, reliability and the antijamming capability of system works.Important element circuit has adopted modularized design, has improved generalization, interchangeability, the maintainability of product.
A kind of three-phase intermediate frequency power supply of the present invention can be widely used in military, civilian intermediate frequency field, and vast market prospect is arranged.
Claims (7)
1. three-phase intermediate frequency power supply, its major loop insert the normal voltage of three-phase 380V/50Hz from external power grid; It is characterized in that, normal voltage is through three-phase fuse, input contactor, anti-electromagnetic interference electromagnetic interface filter, be input to Industrial Frequency Transformer, behind isolated buck, be input to three-phase rectifier, behind bridge rectifier,, obtain the operation DC voltage of major loop by normal K type two elements Γ type L, the filtering of C second-order low-pass filter; Described direct voltage is sent into IGBT switching tube in the high-power three-phase bridge medium-frequency transformation module, carry out the DC/AC conversion, by the output intermediate frequency transformer three-phase voltage of intermediate frequency is isolated, integrated and adjusts again, through second-order low-pass filter filtering, obtain the three-phase intermediate frequency sinusoidal voltage and the output of required IF-FRE again;
Accessory power supply is the control circuit power supply, and control circuit generates intermediate-freuqncy signal and produces three-phase widened pulse control signal, drives the IGBT switching tube as switch change-over, is the three-phase voltage of intermediate frequency with dc voltage conversion;
In control loop, adopt the quartz crystal ring oscillator to produce the high frequency square wave of high frequency stability; Utilizing the cmos digital frequency divider is required intermediate frequency square wave with the high frequency square wave frequency division.
2. three-phase intermediate frequency power supply according to claim 1 is characterized in that, adopts digital phase splitter in control loop, utilizes the digit pulse ring distributor, the intermediate frequency square wave is divided into three road intermediate frequency square waves of 120 ° of the three-phase mutual deviations of standard.
3. three-phase intermediate frequency power supply according to claim 1, it is characterized in that, in control loop, adopt pwm pulse to transfer wide control circuit,, use PID closed-loop adjustment control circuit by to the output voltage instantaneous sampling, at first feedback signal being carried out I, D regulates, again feedback signal is carried out P and regulate, form the PID conditioning signal, directly feed back to pwm pulse and transfer wide control assembly, in real time, directly three road intermediate frequency square waves are regulated duty ratio synchronously, generation three-phase widened pulse control signal.
4. three-phase intermediate frequency power supply according to claim 1, it is characterized in that, adopt the starting impulse lock-in circuit, utilize trigger to keep a starting-up signal, and compare with three-phase widened pulse control signal, when starting, sets up intermediate frequency power supply the three-phase widened pulse control signal of a fixed duty cycle ripple.
5. three-phase intermediate frequency power supply according to claim 1 is characterized in that, photoelectrical coupler is set in control Driver Circuit, and the widened pulse control signal and the high-power IGBT of three-phase intermediate frequency power supply drive controlling are isolated;
At the inner integrated overcurrent fast detector of photoelectrical coupler, directly at the C of all the IGBT switching tubes utmost point, detect the IGBT saturation voltage drop in real time, when the anti-overcurrent of the limit that surpasses high power device IGBT during the time, can turn-off IGBT rapidly.
6. three-phase intermediate frequency power supply according to claim 1 is characterized in that, utilizes comparator to form window comparator circuit at control loop, to imported, the under-voltage protection of prescribing a time limit;
Switch automatic time delay output circuit is set, utilizes R, C to discharge and recharge, control relay is realized voltage of intermediate frequency time-delay output.
7. three-phase intermediate frequency power supply according to claim 1 is characterized in that, adopts the telepresence line, and the change in voltage with in the load feeds back to intermediate frequency power supply, as the feedback superposed signal of PID closed-loop adjustment control circuit.
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| CN2009101039741A CN101562401B (en) | 2009-05-27 | 2009-05-27 | Three-phase intermediate frequency power supply |
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| CN2009101039741A CN101562401B (en) | 2009-05-27 | 2009-05-27 | Three-phase intermediate frequency power supply |
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| CN101562401B true CN101562401B (en) | 2011-06-22 |
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| CN103312201A (en) * | 2012-03-13 | 2013-09-18 | 永济新时速电机电器有限责任公司 | Auxiliary current transformer |
| CN103024957A (en) * | 2012-12-31 | 2013-04-03 | 山东彼岸电力科技有限公司 | Medium-frequency induction heating power source and control method thereof |
| CN109245500A (en) * | 2017-07-10 | 2019-01-18 | 中兴通讯股份有限公司 | Method of supplying power to, apparatus and system |
| CN109104105A (en) * | 2018-07-30 | 2018-12-28 | 东北电力大学 | One kind being directed to Three-phase PWM Voltage Rectifier and LLC resonant converter cascade system novel stable analysis method |
| CN109104073A (en) * | 2018-08-21 | 2018-12-28 | 山东荣泰感应科技有限公司 | Intermediate frequency furnace thyristor constant current Double-closed-loop control circuit and method |
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