CN204741418U - Two level four -quadrant converters - Google Patents
Two level four -quadrant converters Download PDFInfo
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- CN204741418U CN204741418U CN201520564024.XU CN201520564024U CN204741418U CN 204741418 U CN204741418 U CN 204741418U CN 201520564024 U CN201520564024 U CN 201520564024U CN 204741418 U CN204741418 U CN 204741418U
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Abstract
The utility model provides a two level four -quadrant converters, it relates to a converter. The utility model discloses a solve the problem of the two -way flow that the energy can not be realized to present converter, the poor stability of system. The utility model discloses an input termination that electricity voltage on line side gathered the modulate circuit is between electric wire netting and first reactance, the input termination of motor side voltage acquisition modulate circuit is between second reactance and motor, the input termination that electricity current on line side gathered the modulate circuit is between first reactance and three -phase rectifier circuit, the input termination that the modulate circuit was gathered to motor side electric current is between three -phase inverter circuit and second reactance, the input termination of direct current voltage acquisition modulate circuit is at the both ends of electric capacity, electricity voltage on line side gathers the modulate circuit, motor side voltage acquisition modulate circuit, electricity current on line side gathers the modulate circuit, the equal connection control circuit of output of modulate circuit and direct current voltage acquisition modulate circuit is gathered to motor side electric current. The utility model discloses realize the two -way flow of energy, eliminated the electric wire netting harmonic.
Description
Technical field
The utility model relates to a kind of frequency converter, is specifically related to a kind of two level four-quadrant frequency converters, belongs to Frequency Converter Control technical field.
Background technology
Along with the raising day by day of people's living standard, energy-saving low-carbon more and more becomes the emphasis that people pay close attention to, in order to improve capacity usage ratio, for reducing the harmonic wave of net side generation and improving power factor, the utility model proposes four-quadrant circuit topological structure, and adopt two pwm circuit topology, utilize PWM rectifier to realize the two-way flow of energy.
So-called dual PWM-VSI technology, be made up of PWM rectifier and PWM inverter, without the need to increasing any adjunct circuit, just can ensure that system works is under unity power factor, elimination side harmonics pollutes, and energy in bidirectional flow, facilitates motor four quadrant running, dynamic response time is short, and improves the stability of system.
Utility model content
The purpose of this utility model is the two-way flow that frequency converter in order to solve prior art can not realize energy, and the response time is long, the problem of the poor stability of system.
The technical solution of the utility model is: a kind of two level four-quadrant frequency converters, comprise the first reactance, rectified three-phase circuit, electric capacity, three-phase inverting circuit, second reactance, motor, control circuit and acquisition and conditioning circuit, described acquisition and conditioning circuit comprises grid side voltage acquisition modulate circuit, motor side voltage acquisition modulate circuit, grid side current acquisition modulate circuit, motor side current acquisition modulate circuit and direct voltage acquisition and conditioning circuit, electrical network connects rectified three-phase circuit by the first reactance, rectified three-phase circuit connects three-phase inverting circuit by electric capacity, three-phase inverting circuit connects motor by the second reactance, the input of grid side voltage acquisition modulate circuit is connected between electrical network and the first reactance, the input of motor side voltage acquisition modulate circuit is connected between the second reactance and motor, the input of grid side current acquisition modulate circuit is connected between the first reactance and rectified three-phase circuit, the input of motor side current acquisition modulate circuit is connected between three-phase inverting circuit and the second reactance, the two ends entering to terminate at electric capacity of direct voltage acquisition and conditioning circuit, described grid side voltage acquisition modulate circuit, motor side voltage acquisition modulate circuit, grid side current acquisition modulate circuit, the output of motor side current acquisition modulate circuit and direct voltage acquisition and conditioning circuit all connects with control circuit.
Described rectified three-phase circuit comprises the first rectifying bridge arm, the second rectifying bridge arm, the 3rd rectifying bridge arm and the 4th rectifying bridge arm that are connected in parallel, first rectifying bridge arm, the second rectifying bridge arm are identical with the structure of the 3rd rectifying bridge arm, first rectifying bridge arm comprises two power tubes, first reactance connects the mid point of the first rectifying bridge arm, the second rectifying bridge arm and the 3rd rectifying bridge arm respectively, and the 4th rectifying bridge arm comprises energy consumption resistance.Power device is adopted to do PWM rectifier and PWM inverter, the two-way flow that can not only realize energy achieves the four quadrant running of motor, improve the power factor of grid side simultaneously, decrease the generation of side harmonics, reach the object improving the electrical network quality of power supply and energy savings.
Described current detecting modulate circuit comprises current sensor, sampling resistor, follow circuit, anti-phase add circuit and anti-phase ratio circuit, the output of current sensor connects the input of anti-phase add circuit by follow circuit, the output of anti-phase add circuit connects anti-phase ratio circuit, the output connection control circuit of anti-phase ratio circuit, one end of described sampling resistor is connected between current sensor and follow circuit, the other end ground connection of sampling resistor.
Described anti-phase add circuit comprises operational amplifier, the first resistance, the second resistance and the 3rd resistance, follow circuit output is by the inverting input of the first resistance access operational amplifier, 3rd resistance is attempted by between the output of operational amplifier and inverting input, one end of the second resistance is connected on the inverting input of operational amplifier, and the other end of the second resistance is feeder ear.
Described first resistance, the second resistance are identical with the resistance of the 3rd resistance.
Described a kind of two level four-quadrant frequency converters comprise ten No. two drive circuits, the input of described drive circuit all connects with control circuit, wherein the output of No. six drive circuits connects rectified three-phase circuit, the output remaining No. six drive circuits connects three-phase inverting circuit, described drive circuit comprises the optocoupler and back-pressure circuit that are connected in series, the output of optocoupler is the input of drive circuit, and the output of back-pressure circuit is the output of drive circuit.
Described a kind of two level four-quadrant frequency converters comprise synchronization signal detection circuit, described synchronization signal detection circuit comprises transformer, filter circuit, first voltage comparator, inverter and the 4th resistance, the input of transformer connects the output of electrical network, the output of transformer connects the in-phase input end of the first voltage comparator by filter circuit, the reverse inter-input-ing ending grounding of the first voltage comparator, the output of the first voltage comparator connects the input of inverter, the output connection control circuit of inverter, one end of the 4th resistance is connected on the output of inverter, the other end of the 4th resistance is feeder ear.
Described a kind of two level four-quadrant frequency converters comprise some current foldback circuits; described current foldback circuit comprises the second voltage comparator and clamp circuit; the inverting input of the second voltage comparator is the input of current foldback circuit, and the output of the second voltage comparator is through the mid point connection control circuit of clamp circuit.
Described control circuit comprises TMS320F2812 chip, DSP2812 highest frequency can reach 150MHz, this chip peripheral hardware comprises 12,16 tunnel Precision A/D C, 2 road SCI and two event manager module EVA, EVB, and each event manager module comprises 6 tunnels and entirely compares PWM/CMP, 2 road QEP and 3 road CAP.
The utility model compared with prior art has following effect: the two level four-quadrant frequency converters that the utility model adopts, compared with two quadrant frequency converters, the two-way flow of energy can be realized, eliminate mains by harmonics, system is run under unity power factor, improves the utilance of grid power.The utility model can directly control current on line side, reduces current on line side generation ofharmonic, improves power factor.
Accompanying drawing explanation
Fig. 1, structured flowchart of the present utility model;
Fig. 2, the circuit diagram of the utility model reactance, rectified three-phase circuit, electric capacity, three-phase inverting circuit and motor;
Fig. 3, the utility model current detecting modulate circuit figure;
Fig. 4, the utility model drive circuit figure;
Fig. 5, the utility model synchronization signal detection circuit;
Fig. 6, the utility model current foldback circuit.
Embodiment
Accompanying drawings embodiment of the present utility model, the one two level four-quadrant frequency converter of present embodiment, comprise the first reactance Lm, rectified three-phase circuit 1, electric capacity C, three-phase inverting circuit 2, second reactance Ln, threephase asynchronous machine M, control circuit 3 and acquisition and conditioning circuit, described acquisition and conditioning circuit comprises grid side voltage acquisition modulate circuit 4, motor side voltage acquisition modulate circuit 5, grid side current acquisition modulate circuit 6, motor side current acquisition modulate circuit 7 and direct voltage acquisition and conditioning circuit 8, electrical network K connects rectified three-phase circuit 1 by the first reactance Lm, rectified three-phase circuit 1 connects three-phase inverting circuit 2 by electric capacity C, three-phase inverting circuit 2 connects threephase asynchronous machine M by the second reactance Ln, the input of grid side voltage acquisition modulate circuit 4 is connected between electrical network K and the first reactance Lm, the input of motor side voltage acquisition modulate circuit 5 is connected between the second reactance Ln and threephase asynchronous machine M, the input of grid side current acquisition modulate circuit 6 is connected between the first reactance Lm and rectified three-phase circuit 1, the input of motor side current acquisition modulate circuit 7 is connected between three-phase inverting circuit 2 and the second reactance Ln, the input of direct voltage acquisition and conditioning circuit 8 is connected on the two ends of electric capacity C, described grid side voltage acquisition modulate circuit 4, motor side voltage acquisition modulate circuit 5, grid side current acquisition modulate circuit 6, the output of motor side current acquisition modulate circuit 7 and direct voltage acquisition and conditioning circuit 8 all connects with control circuit 3.
Described rectified three-phase circuit 1 comprises the first rectifying bridge arm be connected in parallel, second rectifying bridge arm, 3rd rectifying bridge arm and the 4th rectifying bridge arm, first rectifying bridge arm, second rectifying bridge arm is identical with the structure of the 3rd rectifying bridge arm, first rectifying bridge arm comprises two Series power pipe VT1 and VT2, second rectifying bridge arm comprises two Series power pipe VT3 and VT4, 3rd rectifying bridge arm comprises two Series power pipe VT5 and VT6, first reactance Lm connects the first rectifying bridge arm respectively, the mid point of the second rectifying bridge arm and the 3rd rectifying bridge arm, 4th rectifying bridge arm comprises energy consumption resistance R
l.
Described three-phase inverting circuit 2 comprises the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge leg that are connected in parallel, first inverter bridge leg, the second inverter bridge leg are identical with the structure of the 3rd inverter bridge leg, first inverter bridge leg comprises two Series power pipe VT7 and VT8, second inverter bridge leg comprises two Series power pipe VT9 and VT10,3rd inverter bridge leg comprises two Series power pipe VT11 and VT12, and the second reactance Ln connects the mid point of the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge leg respectively.
Described current detecting modulate circuit comprises current sensor 9, sampling resistor R
m, follow circuit 10, anti-phase add circuit 11 and anti-phase ratio circuit 12, the output of current sensor 9 connects the input of anti-phase add circuit 11 by follow circuit 10, the output of anti-phase add circuit 11 connects anti-phase ratio circuit, the output connection control circuit 3 of anti-phase ratio circuit, described sampling resistor R
man end be connected between current sensor 9 and follow circuit 10, sampling resistor R
mother end ground connection.The current sensor 9 of present embodiment is Hall current sensor.
Described anti-phase add circuit 11 comprises operational amplifier 13, first resistance R1, the second resistance R2 and the 3rd resistance R3, follow circuit 10 output accesses the inverting input of operational amplifier 13 by the first resistance R1, between the output that 3rd resistance R3 is attempted by operational amplifier 13 and inverting input, one end of the second resistance R2 is connected on the inverting input of operational amplifier 13, and the other end of the second resistance R2 is feeder ear.
Described first resistance R1, the second resistance R2 are identical with the resistance of the 3rd resistance R3.Tested electric current is received the former limit of Hall current sensor 9, the current signal that transducer exports is by sampling resistor R
mbe converted to voltage signal.Because the voltage range of the inner A/D sampling of DSP2812 is 0V to 3V, therefore bias voltage elects 1.5V as, voltage corresponding to sample rate current maximum elects 2.5V as, and voltage corresponding to sample rate current minimum value elects 0.5V as, namely the amplitude of voltage is set to 1V, namely sampling resistor R
mon voltage magnitude be 1V.
Described a kind of two level four-quadrant frequency converters comprise ten No. two drive circuits, the input of described drive circuit all connects with control circuit 3, wherein the output of No. six drive circuit Q1 connects the power tube of rectified three-phase circuit 1, the output remaining No. six drive circuit Q2 connects the power tube of three-phase inverting circuit 2 respectively, described drive circuit comprises the optocoupler 14 and back-pressure circuit 15 that are connected in series, the output of optocoupler 14 is the input of drive circuit, the output of back-pressure circuit 15 is the output of drive circuit, the optocoupler TLP250 that present embodiment adopts is as system drive control chip, optocoupler is used to drive the isolation that can realize strong and weak electricity signal, reduce system power unit to the interference of key control unit.Meanwhile, optocoupler output connect back-pressure circuit 15 can the reliable turn-off of guaranteed output switching tube, prevent from misleading and cause device for power switching to damage, improve system reliability.
Described a kind of two level four-quadrant frequency converters comprise synchronization signal detection circuit, described synchronization signal detection circuit comprises transformer T, RC filter circuit 16, first voltage comparator 17, inverter 18 and the 4th resistance R4, the input of transformer T connects the output of electrical network K, the output of transformer T connects the in-phase input end of the first voltage comparator 17 by RC filter circuit 16, the reverse inter-input-ing ending grounding of the first voltage comparator 17, the output of the first voltage comparator 17 connects the input of inverter 18, the output connection control circuit 3 of inverter 18, one end of the 4th resistance R4 is connected on the output of inverter 18, the other end of the 4th resistance R4 is feeder ear.Be that the step-down transformer T of 220:6 carries out step-down process to electrical network K voltage by no-load voltage ratio, to obtain effective value be about 6V and electrical network K with the sinusoidal signal of homophase frequently.This signal accesses the in-phase input end of voltage comparator LM339 after RC filtering, end of oppisite phase ground connection.Present embodiment first voltage comparator 17 adopt be LM339, inverter 18 be 74HC06, when line voltage is greater than zero, LM339 output+5V high level; When line voltage is less than zero, LM339 exports the low level of 0V.Signal is now the square-wave signal of 50% duty ratio, and the square-wave signal of+5V, through 74HC06 inverter 18 shaping, is become the square-wave signal of+3.3V from+3.3V power supply and pull-up resistor R4 by this signal, to meet the voltage range requirement of DSP2812 to input signal,
Described a kind of two level four-quadrant frequency converters comprise some current foldback circuits; described current foldback circuit comprises the second voltage comparator 19 and clamp circuit 20; the inverting input of the second voltage comparator 19 is the input of current foldback circuit, and the output of the second voltage comparator 19 is through the mid point connection control circuit 3 of clamp circuit 20.Second voltage comparator 19 of present embodiment is LM393, and current signal connects the inverting input of voltage comparator LM393.When in circuit, electric current is in normal range (NR), LM393 exports+5V high level, through+3.3V and diode clamp, and final output+3.3V high level.When in circuit, electric current is excessive, LM393 exports 0V low level, and circuit finally exports as 0V.
Described control circuit 3 comprises TMS320F2812 chip.TMS320F2812 chip has the advantages such as high performance-price ratio, multi-functional, high-performance, is one of the most influential processor at present at control field.The highest 150MHz of dominant frequency of F2812 digital signal processor, operational precision reaches 32, fast response time, and precision is high and have pwm pulse output function.The internal storage of this chip includes the flash storage of 128kB × 16, the ROM of 128kB × 16, and the OTP ROM etc. of 1kB × 16, and the flexibility of application is improved greatly.High-performance 12 ADC 80ns the fastest change-over time of 2 × 8 passages, and there are two sampling hold circuits, can binary channels synchronized sampling be carried out.
Utility model works process is: when threephase asynchronous machine M is operated in motoring condition.Energy flows to threephase asynchronous machine M from electrical network via commutating circuit and inversion circuit, and frequency converter is operated in first, third quadrant.When motor is operated in generating state time, the energy that threephase asynchronous machine M produces feeds back to DC bus by the diode of inverter side, when DC bus-bar voltage exceedes certain value, rectification side energy feedback control section starts, DC inversion being become to exchange, by controlling inverter voltage phase place and amplitude by energy feedback to electrical network, reaching energy-conservation effect, now energy flows to electrical network by threephase asynchronous machine M by inverter side, rectification side, and frequency converter is operated in two, four-quadrant.
Claims (8)
1. a level four-quadrant frequency converter, comprise the first reactance, rectified three-phase circuit, electric capacity, three-phase inverting circuit, second reactance, motor, control circuit and acquisition and conditioning circuit, it is characterized in that: described acquisition and conditioning circuit comprises grid side voltage acquisition modulate circuit, motor side voltage acquisition modulate circuit, grid side current acquisition modulate circuit, motor side current acquisition modulate circuit and direct voltage acquisition and conditioning circuit, electrical network connects rectified three-phase circuit by the first reactance, rectified three-phase circuit connects three-phase inverting circuit by electric capacity, three-phase inverting circuit connects motor by the second reactance, the input of grid side voltage acquisition modulate circuit is connected between electrical network and the first reactance, the input of motor side voltage acquisition modulate circuit is connected between the second reactance and motor, the input of grid side current acquisition modulate circuit is connected between the first reactance and rectified three-phase circuit, the input of motor side current acquisition modulate circuit is connected between three-phase inverting circuit and the second reactance, the two ends entering to terminate at electric capacity of direct voltage acquisition and conditioning circuit, described grid side voltage acquisition modulate circuit, motor side voltage acquisition modulate circuit, grid side current acquisition modulate circuit, the output of motor side current acquisition modulate circuit and direct voltage acquisition and conditioning circuit all connects with control circuit.
2. a kind of two level four-quadrant frequency converters according to claim 1, it is characterized in that: described rectified three-phase circuit comprises the first rectifying bridge arm, the second rectifying bridge arm, the 3rd rectifying bridge arm and the 4th rectifying bridge arm that are connected in parallel, first rectifying bridge arm, the second rectifying bridge arm are identical with the structure of the 3rd rectifying bridge arm, first rectifying bridge arm comprises the power tube of two series connection, first reactance connects the mid point of the first rectifying bridge arm, the second rectifying bridge arm and the 3rd rectifying bridge arm respectively, and the 4th rectifying bridge arm comprises energy consumption resistance.
3. a kind of two level four-quadrant frequency converters according to claim 1, it is characterized in that: described current detecting modulate circuit comprises current sensor, sampling resistor, follow circuit, anti-phase add circuit and anti-phase ratio circuit, the output of current sensor connects the input of anti-phase add circuit by follow circuit, the output of anti-phase add circuit connects anti-phase ratio circuit, the output connection control circuit of anti-phase ratio circuit, one end of described sampling resistor is connected between current sensor and follow circuit, the other end ground connection of sampling resistor.
4. a kind of two level four-quadrant frequency converters according to claim 3, it is characterized in that: described anti-phase add circuit comprises operational amplifier, the first resistance, the second resistance and the 3rd resistance, follow circuit output is by the inverting input of the first resistance access operational amplifier, 3rd resistance is attempted by between the output of operational amplifier and inverting input, one end of the second resistance is connected on the inverting input of operational amplifier, and the other end of the second resistance is feeder ear.
5. a kind of two level four-quadrant frequency converters according to claim 1, it is characterized in that: described a kind of two level four-quadrant frequency converters comprise ten No. two drive circuits, the input of described drive circuit all connects with control circuit, wherein the output of No. six drive circuits connects rectified three-phase circuit, the output remaining No. six drive circuits connects three-phase inverting circuit, described drive circuit comprises the optocoupler and back-pressure circuit that are connected in series, the output of optocoupler is the input of drive circuit, and the output of back-pressure circuit is the output of drive circuit.
6. a kind of two level four-quadrant frequency converters according to claim 1, it is characterized in that: described a kind of two level four-quadrant frequency converters comprise synchronization signal detection circuit, described synchronization signal detection circuit comprises transformer, filter circuit, first voltage comparator, inverter and the 4th resistance, the input of transformer connects the output of electrical network, the output of transformer connects the in-phase input end of the first voltage comparator by filter circuit, the reverse inter-input-ing ending grounding of the first voltage comparator, the output of the first voltage comparator connects the input of inverter, the output connection control circuit of inverter, one end of the 4th resistance is connected on the output of inverter, the other end of the 4th resistance is feeder ear.
7. a kind of two level four-quadrant frequency converters according to claim 1; it is characterized in that: described a kind of two level four-quadrant frequency converters comprise some current foldback circuits; described current foldback circuit comprises the second voltage comparator and clamp circuit; the inverting input of the second voltage comparator is the input of current foldback circuit, and the output of the second voltage comparator is through the mid point connection control circuit of clamp circuit.
8. a kind of two level four-quadrant frequency converters according to claim 1, is characterized in that: described control circuit comprises TMS320F2812 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520564024.XU CN204741418U (en) | 2015-07-30 | 2015-07-30 | Two level four -quadrant converters |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520564024.XU CN204741418U (en) | 2015-07-30 | 2015-07-30 | Two level four -quadrant converters |
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| CN204741418U true CN204741418U (en) | 2015-11-04 |
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| CN201520564024.XU Expired - Fee Related CN204741418U (en) | 2015-07-30 | 2015-07-30 | Two level four -quadrant converters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841763A (en) * | 2016-12-16 | 2017-06-13 | 大禹电气科技股份有限公司 | A kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method |
| CN109980950A (en) * | 2019-04-12 | 2019-07-05 | 山东华特磁电科技股份有限公司 | Double PWM variable-frequency power sources feedback energy processing units and method |
-
2015
- 2015-07-30 CN CN201520564024.XU patent/CN204741418U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841763A (en) * | 2016-12-16 | 2017-06-13 | 大禹电气科技股份有限公司 | A kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method |
| CN106841763B (en) * | 2016-12-16 | 2023-11-24 | 大禹电气科技股份有限公司 | Voltage detection circuit and voltage detection method for medium-voltage and high-voltage variable-frequency speed regulation device |
| CN109980950A (en) * | 2019-04-12 | 2019-07-05 | 山东华特磁电科技股份有限公司 | Double PWM variable-frequency power sources feedback energy processing units and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151104 Termination date: 20160730 |