CN107437899B - The sinusoidal single-phase AC-DC conversion circuit of net stream - Google Patents
The sinusoidal single-phase AC-DC conversion circuit of net stream Download PDFInfo
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- CN107437899B CN107437899B CN201710823716.5A CN201710823716A CN107437899B CN 107437899 B CN107437899 B CN 107437899B CN 201710823716 A CN201710823716 A CN 201710823716A CN 107437899 B CN107437899 B CN 107437899B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
Abstract
The present invention provides a kind of single-phase AC-DC conversion circuit that net stream is sinusoidal, including power circuit and control circuit, in which: power conversion of the power circuit to complete single-phase AC-DC；The control circuit is to complete instantaneous detection and AD conversion to output voltage and network voltage, and output voltage and network voltage are handled according to outer voltage control principle, obtain compensated duty ratio, and form PWM driving pulse, control the switch state of power switch in the power circuit, when so that network voltage being distorted, input current remains sinusoidal.The characteristics of input current remains sinusoidal single-phase AC-DC conversion when the present invention realizes network voltage distortion, has and controls simple, response quickly, eliminates power quality pollution.
Description
Technical field
The present invention relates to a kind of single-phase power converters of Technics of Power Electronic Conversion technical field, and in particular, to one kind is
Make network pressure that can also net stream sinusoidal single-phase AC-DC conversion circuit when distorting.
Background technique
In order to cope with Single-phase AC-DC converters work when network voltage be distorted caused by power quality pollution problem,
The harm for reducing harmonic current, inhibits the interference of harmonic current, complies with the relevant criterion of harmonic current, needs using feedback
Modulation technique.The feedback modulation technology of Single-phase AC-DC converters has various control strategy, such as traditional double-closed-loop control.
Inhibit the effect of side harmonics electric current preferable using double-loop control strategy, but control circuit is complicated, modulation system is cumbersome.?
In principle, double-closed-loop control is needed using outer voltage at a slow speed, stablizes output DC voltage with this.Conventional voltage outer ring one
As use voltage error amplifier, the inertia of voltage error amplifier is larger, affects the dynamic of double-closed-loop control to a certain extent
State response speed.
By the retrieval to the Single-phase AC-DC converters prior art using feedback control principle, discovery mainly has following
Representative document:
[1] Li Dong and Ruan Xinbo " efficient BOOST type PFC preconditioner " China electrical engineering
.V24, No.10,2004.10:153-156 are reported, technical characteristics are as follows: using UC3854BN analog controller, two close cycles
Control structure, voltage error amplifier is as outer voltage controller, and pi regulator is as current inner loop controller.
[2] He Zhiyuan and Wei Wei " the PWM rectifier directive overrurrent relay based on Virtual shipyard controls research " Zhejiang University is learned
Report .V38, No.12,2004.11:1619-1622, technical characteristics are as follows: three-phase rectifier, voltage error amplifier are made
For outer voltage controller, but due to using bang-bang control, switching frequency is brought to be mutated but introducing disturbance and noise, reduce
The reliability of system, even more so that the performance of system deteriorates.
In summary, the retrieval of the Single-phase AC-DC converters prior art is found, traditional single-phase AC-DC conversion circuit
Lack the feedback control strategy of preferably reply network voltage distortion, there are the severe phenomenons of harmonic current injection power grid, cause electricity
The contaminated problem of network electric energy quality.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of single-phase AC-DC conversion electricity that net stream is sinusoidal
Road, input current remains sinusoidal single-phase AC-DC conversion when realizing network voltage distortion, has control simple, response is fast
Speed, the advantages of preventing power quality from polluting.
The present invention is achieved by the following technical solutions.
The present invention provides a kind of single-phase AC-DC conversion circuit that net stream is sinusoidal, including power circuit and control circuit,
In:
Power conversion of the power circuit to complete single-phase AC-DC；
The control circuit is to complete to the instantaneous detection of output voltage and network voltage and AD conversion, and according to voltage
Outer loop control principle is handled (including simulation trial, digital operation and logical process) to output voltage and network voltage, is obtained
To compensated duty ratio, and PWM driving pulse is formed, controls the switch state of power switch in the power circuit, so that
When network voltage is distorted, input current remains sinusoidal waveform；Specifically:
The control circuit includes output voltage controlling circuit, power grid voltage detection circuit, voltage lifting circuit and DSP journey
Sequence unit；Wherein:
The output voltage controlling circuit is used to obtain the difference of output voltage signal and reference voltage and by integrator
After pi regulator effect, output voltage control value is obtained, is sent into DSP program unit；
The power grid voltage detection circuit is used to obtain the sampled value of power grid instantaneous voltage and acts on through differential amplifier circuit
Afterwards, it is sent into voltage and is lifted circuit；
The voltage lifting circuit is used to be lifted the sampled value of the power grid instantaneous voltage of input and is sent into DSP program unit；
The DSP program unit is used at sampled value and output voltage detected value to the power grid instantaneous voltage of input
Reason obtains revised duty when modulated switching frequency, forms PWM driving pulse, controls function in the power circuit
The PWM switch state of rate switch.
Preferably, the power circuit includes filter circuit and rectification circuit, in which:
The filter circuit is mainly made of LC filter inductance and LC filter capacitor, wherein a termination electricity of LC filter inductance
The other end of net firewire, LC filter inductance is followed by grid zero line through LC filter capacitor, constitutes LC filter circuit；
The rectification circuit includes one-way commutation bridge, the 9th diode, electrolytic capacitor and partial pressure branch；The one-way commutation
Bridge is mainly made of the first to the 8th diode, first to third power switch, the first inductance and the second inductance, described single-phase whole
The first bridge arm for flowing bridge includes first to fourth diode, the first power switch and the first inductance, wherein the second diode, third
Diode, the first power switch and the second inductance form loop checking installation in bridge arm, and first diode is located at the height of the first bridge arm
End, the 4th diode are located at the low side of the first bridge arm；Second bridge arm of the single-phase rectification bridge include the 5th to the 8th diode,
Second power switch and the second inductance, wherein the 6th diode, the 7th diode, the second power switch and the second inductance are in bridge arm
Middle formation loop checking installation, the 5th diode are located at the high-end of the second bridge arm, and the 8th diode is located at the low side of the second bridge arm；It is described
The third bridge arm of single-phase rectification bridge is made of third power switch；First bridge arm, the high-end common cathode of the second bridge arm are connected,
And output voltage anode is formed after the 9th diode；First bridge arm, the low side common-anode of the second bridge arm are connected, and are formed
Output voltage cathode；First bridge arm, the second bridge arm midpoint be connected with the both ends of the LC filter capacitor；The output electricity
An electrolytic capacitor in parallel between positive pressure pole and cathode；The partial pressure branch includes concatenated three divider resistances, and first point
One end of piezoresistance is connected with output voltage anode, one end phase of the other end of first divider resistance and second divider resistance
Even, the other end of second divider resistance is connected with one end of third divider resistance, the other end of third divider resistance and
Output voltage cathode is connected.
Preferably, the control circuit output voltage controlling circuit, power grid voltage detection circuit, voltage lifting circuit and
DSP program unit, in which:
The input terminal of the output voltage controlling circuit is connected with the output end for dividing branch in power circuit, described defeated
The output end of voltage control circuit is connected with DSP program unit out, the input terminal and power of the power grid voltage detection circuit
The input terminal of circuit is connected, and the output end of the power grid voltage detection circuit is connected with the input terminal of voltage lifting circuit,
The output end of the voltage lifting circuit is connected with DSP program unit.
Preferably, the input terminal of the output voltage controlling circuit and the output end phase that branch is divided in the power circuit
Even, including first resistor, second resistance, the first operational amplifier, first capacitor and the second capacitor, wherein output voltage is through the
The negative-phase input that the first operational amplifier is inputted after one resistance, with reference to voltage input to the positive of the first operational amplifier
Input terminal, first capacitor is in parallel with the second capacitor after connecting with second resistance, whole again later to be connected in parallel on the first operational amplifier
Negative-phase input and output end between, constitute integrator and pi regulator, the difference of output voltage and reference voltage is by accumulating
After dividing device and pi regulator effect, it is sent into DSP program unit (the first ADC module).
Preferably, the input terminal of the power grid voltage detection circuit is connected with the input terminal in the power circuit, including
Third is to eleventh resistor, third capacitor, the 4th capacitor and second operational amplifier, wherein the 7th resistance, 3rd resistor,
Four resistance, the 5th resistance and the 6th resistance bleeder circuit in series, the both ends of bleeder circuit are respectively through third capacitor and the 4th
It is grounded after capacitor, power grid instantaneous voltage is sampled after the effect of the partial pressure of bleeder circuit；The positive of second operational amplifier and
Negative-phase input is connected the 8th resistance and the 9th resistance respectively, between the negative-phase input and output end of second operational amplifier again
Tenth resistance in parallel, and the normal phase input end of second operational amplifier is grounded after eleventh resistor, is constituted differential amplification with this
Circuit, the sampled value of power grid instantaneous voltage are sent into voltage and are lifted circuit after differential amplifier circuit acts on.
Preferably, the resistance value of the 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance is all larger than the 7th resistance
Resistance value, the 8th resistance are equal with the resistance value of the 9th resistance.
Preferably, the input terminal of the voltage lifting circuit is connected with the output end of power grid voltage detection circuit, including the
12 to the 15th resistance, third operational amplifier and the 5th capacitor, wherein additional power source inputs after the 14th resistance
The normal phase input end of three operational amplifiers, one end ground connection of twelfth resistor, the other end and thirteenth resistor of twelfth resistor
It is connected, thirteenth resistor is connected in parallel between the negative-phase input and output end of third operational amplifier, twelfth resistor and 13
Resistance plays the role of partial pressure, the voltage input third operation that twelfth resistor is got to the output end voltage of third operational amplifier
The negative-phase input of amplifier, the 15th resistance are connected on the output end of third operational amplifier, connect again through the 5th capacitor later
Ground, the sampled value of power grid instantaneous voltage are sent into DSP program unit (the second ADC module) after being lifted.
The DSP program unit includes six digital modules: the first ADC module, the second ADC module, phase-locked loop module, reason
Think that module occurs for voltage computing module, instantaneous duty ratio computing module and pwm pulse；Wherein:
The input terminal of first ADC module is connected with the output end of the output voltage controlling circuit, by output voltage
Detected value analog quantity is converted to current duty cycle (digital quantity less than 1), is re-fed into the of the instantaneous duty ratio computing module
One entrance；
The input terminal of second ADC module is connected with the output end of voltage lifting circuit, by the power grid after lifting
The sampled value analog quantity of instantaneous voltage is converted to digital quantity, is re-fed into the phase-locked loop module and the instantaneous duty ratio calculates mould
The third entrance of block；
The input terminal of the phase-locked loop module is connected with the output end of the second ADC module, by the sampling of power grid instantaneous voltage
The phase of value is fixed, and eliminating influences caused by electric network voltage phase drift, is re-fed into the second of the desired voltage computing module
Entrance；
The first entrance of the desired voltage computing module inputs ideal grid voltage amplitude, desired voltage computing module
Second entrance is connected with the output end of the phase-locked loop module, and two entrance input values of desired voltage computing module obtain after being multiplied
The corresponding digital quantity sampled value of ideal network voltage, is re-fed into the second entrance of the instantaneous duty ratio computing module；
The first entrance of the instantaneous duty ratio computing module is connected with the output end of first ADC module, instantaneously accounts for
Sky is connected than the second entrance of computing module with the output end of the desired voltage computing module, instantaneous duty ratio computing module
Third entrance is connected with the output end of second ADC module；Instantaneous duty ratio computing module uses L' Hospital's ruler, to ideal
The ratio of network voltage and current electric grid voltage carries out evolution, obtains modulation duty cycle multiplied by the duty ratio of current driving pulse,
It is re-fed into the first entrance that module occurs for the pwm pulse；
The first entrance that module occurs for the pwm pulse is connected with the output end of the instantaneous duty ratio computing module, uses
In input modulation duty cycle, the second entrance that module occurs for pwm pulse is used to input the period of PWM driving pulse, pwm pulse hair
Two entrance input values of raw module generate modulation (PWM) driving pulse after being multiplied；
The output end of the DSP program unit is connected with the gate pole of power switch in the power circuit.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Switch state is identical when three power switch work normally in power circuit of the present invention, shares outside voltage
The same PWM driving pulse that loop control circuit issues, control strategy is simple, and DCM operating mode, inductance value is smaller, single-phase
AC-DC converter field, the still example without this respect application.
The control circuit that design simulation circuit of the present invention is combined with DSP program, i.e. outer voltage control, without biography
The double -loop control of the current inner loop combination outer voltage of system advantageously reduces the complexity of control circuit, improves calculated result
Precision；Power circuit structure novel of the present invention, operating mode DCM, the switch state of three power switch is identical,
The same PWM driving pulse all the way that control circuit output can be shared, reduces the control difficulty of power switch to a certain extent；Control
Circuit processed is accurately flexible, power circuit novel and high-efficiency, and no matter whether network pressure is distorted, and net side input current is sinusoidal always, has
Effect prevents power quality in AC-DC conversion process contaminated.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is control circuit schematic diagram of the present invention.
Fig. 2 is power circuit schematic diagram of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As depicted in figs. 1 and 2, the present embodiment provides a kind of single-phase AC-DC conversion circuits that net stream is sinusoidal, including control electricity
Road and power circuit, in which: the control circuit to complete to the instantaneous detection of output voltage and network voltage and AD conversion,
And simulation trial, digital operation and logical process are carried out to output voltage and network voltage according to outer voltage control principle, it obtains
To compensated duty ratio and PWM driving pulse is formed, controls the switch state of power switch in the power circuit, so that electric
When net voltage is distorted, input current remains sinusoidal waveform；Power of the power circuit to complete single-phase AC-DC
Transformation；Input current remains sinusoidal single-phase AC-DC conversion when the present embodiment realizes network voltage distortion, has control letter
It is single, response quickly, the characteristics of preventing power quality from polluting.
The sinusoidal single-phase AC-DC conversion circuit of net stream provided in this embodiment, the control circuit is to complete to output
The instantaneous detection of voltage and network voltage, AD conversion, and according to outer voltage control principle carry out simulation trial, digital operation and
Logical process obtains compensated duty ratio and forms PWM driving pulse, controls in the power circuit three power switch
Switch state, so that even if input current remains sinusoidal waveform when network voltage is distorted；Power circuit is to complete
The power conversion of single-phase AC-DC.
The control circuit includes output voltage controlling circuit, power grid voltage detection circuit, voltage lifting circuit and DSP journey
Sequence unit；Wherein:
The output voltage controlling circuit is used to obtain the difference of output voltage and reference voltage and passes through integrator and PI
After controller action, output voltage control value is obtained, is sent into DSP program unit；
The power grid voltage detection circuit is used to obtain the sampled value of power grid instantaneous voltage and acts on through differential amplifier circuit
Afterwards, it is sent into voltage and is lifted circuit；
The voltage lifting circuit is used to be lifted the sampled value of the power grid instantaneous voltage of input and is sent into DSP program unit；
The DSP program unit is used at sampled value and output voltage detected value to the power grid instantaneous voltage of input
Reason obtains revised duty when modulated switching frequency, forms PWM driving pulse, controls function in the power circuit
The PWM switch state of rate switch.
Specifically:
As shown in Fig. 2, the power circuit includes filter circuit and rectification circuit, in which:
The filter circuit is mainly made of LC filter inductance L0 and LC filter capacitor C0, wherein the one of LC filter inductance L0
Power grid firewire is terminated, the other end of LC filter inductance L0 is followed by grid zero line through LC filter capacitor C0, constitutes LC filter circuit；
The rectification circuit includes one-way commutation bridge, the 9th diode, electrolytic capacitor and partial pressure branch；The one-way commutation
Bridge is mainly made of the first to the 8th diode, first to third power switch and the first, second inductance, the single-phase rectification bridge
The first bridge arm include first to fourth diode, the first power switch and the first inductance, wherein the second diode D2, the three or two
Pole pipe D3, the first power switch S1 and the first inductance L1 form loop checking installation in bridge arm, and first diode D1 is located at the first bridge
Arm it is high-end, the 4th diode D4 is located at the low side of the first bridge arm；Second bridge arm of the single-phase rectification bridge includes the 5th to the
Eight diodes, the second power switch and the second inductance, wherein the 6th diode D6, the 7th diode D7, the second power switch S2
And second inductance L2 loop checking installation is formed in bridge arm, the 5th diode D5 is located at the high-end of the second bridge arm, the 8th diode D8
Positioned at the low side of the second bridge arm；The third bridge arm of the single-phase rectification bridge is made of third power switch S3；Described first, second
The high-end common cathode of bridge arm is connected, and output voltage anode is formed after the 9th diode D9；First, second bridge arm it is low
It holds common-anode to be connected, and forms output voltage cathode；The midpoint of first, second bridge arm and the two of the LC filter capacitor C0
End is connected；One electrolytic capacitor E1 of (positive and negative end) parallel connection between the output voltage anode and cathode；The partial pressure branch
Including concatenated three divider resistances RV1, RV2 and RV3, one end and the output voltage anode DCP phase of first divider resistance RV1
Even, the other end of first divider resistance RV1 is connected with one end of second divider resistance RV2, second divider resistance RV2's
The other end is connected with one end of third divider resistance RV3, the other end and output voltage cathode of third divider resistance RV3
DCN is connected.
As shown in Figure 1, the output voltage controlling circuit of the control circuit, power grid voltage detection circuit, voltage lifting electricity
Road and DSP program unit, in which:
The input terminal of the output voltage controlling circuit is connected with the output end for dividing branch in power circuit, described defeated
The output end of voltage control circuit is connected with DSP program unit out, the input terminal and power of the power grid voltage detection circuit
The input terminal of circuit is connected, and the output end of the power grid voltage detection circuit is connected with the input terminal of voltage lifting circuit,
The output end of the voltage lifting circuit is connected with DSP program unit.
Further, the input terminal of the output voltage controlling circuit and the output end that branch is divided in the power circuit
It is connected, including first resistor R1, second resistance R2, the first operational amplifier A1, first capacitor C1 and the second capacitor C2, wherein
Output voltage inputs the negative-phase input of the first operational amplifier after first resistor, with reference to voltage input to the first operation
The normal phase input end of amplifier, first capacitor is in parallel with the second capacitor after connecting with second resistance, whole again later to be connected in parallel on the
Between the negative-phase input and output end of one operational amplifier, integrator and pi regulator, output voltage and reference voltage are constituted
Difference by integrator and pi regulator effect after, be sent into DSP program unit in the first ADC module.
Further, the input terminal of the power grid voltage detection circuit is connected with the input terminal in the power circuit, packet
Third is included to eleventh resistor R3~R11, third capacitor C3, the 4th capacitor C4 and second operational amplifier A2, wherein smaller resistance
The 7th resistance and the 3rd resistor of larger resistance value, the 4th resistance, the 5th resistance, the 6th resistance bleeder circuit in series of value,
The both ends of bleeder circuit are grounded after third capacitor and the 4th capacitor respectively, and power grid instantaneous voltage is made by the partial pressure of bleeder circuit
It is sampled with rear；The positive and negative-phase input of second operational amplifier connect respectively identical 8th resistance of resistance value and the 9th electricity
Resistance, the tenth resistance in parallel again between the negative-phase input and output end of second operational amplifier, and second operational amplifier is just
Phase input terminal is grounded after eleventh resistor, is constituted differential amplifier circuit with this, the sampled value of power grid instantaneous voltage is put through difference
After big circuit function, it is sent into voltage and is lifted circuit input end.
Preferably, the resistance value of the 3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 are all larger than
The resistance value of seven resistance R7, the 8th resistance R8 are equal with the resistance value of the 9th resistance R9.
Preferably, the input terminal of the voltage lifting circuit is connected with the output end of power grid voltage detection circuit, including the
12 to the 15th resistance R12~R15, third operational amplifier A3 and the 5th capacitor C5, wherein additional power source is through the 14th
The normal phase input end of third operational amplifier, one end ground connection of twelfth resistor, the other end of twelfth resistor are inputted after resistance
It is connected with thirteenth resistor, thirteenth resistor is connected in parallel between the negative-phase input and output end of third operational amplifier, and the tenth
Two resistance and 13 resistance play the role of partial pressure, the voltage that twelfth resistor is got to the output end voltage of third operational amplifier
The negative-phase input of third operational amplifier is inputted, the 15th resistance is connected on the output end of third operational amplifier, Zhi Houzai
Through the 5th capacity earth, voltage lifting circuit is constituted with this, the sampled value of power grid instantaneous voltage is sent into DSP program list after being lifted
The second ADC module in member.
The DSP program unit includes six digital modules: the first ADC module B1, the second ADC module B3, locking phase ring moulds
Module B6 occurs for block, desired voltage computing module, instantaneous duty ratio computing module and pwm pulse；Wherein:
The input terminal of first ADC module is connected with the output end of the output voltage controlling circuit, by output voltage
Detected value (analog quantity) is converted to current duty cycle (digital quantity less than 1), is re-fed into the instantaneous duty ratio computing module
First entrance；
The input terminal of second ADC module is connected with the output end of voltage lifting circuit, by the power grid after lifting
The sampled value (analog quantity) of instantaneous voltage is converted to digital quantity, is re-fed into the phase-locked loop module and the instantaneous duty ratio calculates
The third entrance of module；
The input terminal of the phase-locked loop module is connected with the output end of the second ADC module, by the sampling of power grid instantaneous voltage
The phase of value is fixed, and eliminating influences caused by electric network voltage phase drift, is re-fed into the second of the desired voltage computing module
Entrance；
The first entrance of the desired voltage computing module inputs ideal grid voltage amplitude, desired voltage computing module
Second entrance is connected with the output end of the phase-locked loop module, and two entrance input values of desired voltage computing module obtain after being multiplied
The corresponding digital quantity sampled value of ideal network voltage, is re-fed into the second entrance of the instantaneous duty ratio computing module；
The first entrance of the instantaneous duty ratio computing module is connected with the output end of first ADC module, instantaneously accounts for
Sky is connected than the second entrance of computing module with the output end of the desired voltage computing module, instantaneous duty ratio computing module
Third entrance is connected with the output end of second ADC module；Instantaneous duty ratio computing module uses L' Hospital's ruler, to ideal
The ratio of network voltage and current electric grid voltage carries out evolution, obtains modulation duty cycle multiplied by the duty ratio of current driving pulse,
It is re-fed into the first entrance that module occurs for the pwm pulse；
The first entrance that module occurs for the pwm pulse is connected with the output end of the instantaneous duty ratio computing module, uses
In input modulation duty cycle, the second entrance that module occurs for pwm pulse is used to input the period of PWM driving pulse, pwm pulse hair
Two entrance input values of raw module generate modulation (PWM) driving pulse after being multiplied；
The output end of the DSP program unit is connected with the gate pole of power switch in the power circuit.
In Fig. 1, u'o indicates the DC output voltage after partial pressure；UrefIndicate DC output voltage reference；Ua indicates power grid
Voltage or supply voltage；u'aIndicate filtered network voltage or supply voltage；D indicates intermediate duty ratio；D' expression finally accounts for
Empty ratio, wherein
In Fig. 2, iaIndicate power network current；ic0Indicate capacitor C0Electric current；i'aIndicate power network current after filtering；iL1Indicate electricity
Feel L1 electric current；iL2Indicate inductance L2 electric current；iD1Indicate diode D1 electric current；iD5Indicate diode D5 electric current；iD15Indicate two poles
Pipe D1 and D5 resultant current；iD9Indicate diode D9 electric current；Io indicates output electric current；iE1Indicate electrolytic capacitor E1 electric current；Uo is
DC output voltage；U'o is the result after uo partial pressure.
In this example: AC-input voltage wide scope, 85VAC~264VAC, power frequency, nominal input voltage 220VAC, volume
Surely DC voltage average value 50-500VDC is exported, ripple voltage peak-to-peak value is 10V.
Each component parameters may be selected as follows:
Switching frequency: 40kHz -100kHz；
Ac filter inductance L0:1mH, plug-in unit；
Ac filter capacitor C0:275V, 2.2 μ F, plug-in unit；
Reversed fast recovery diode D1-D9:600V, 35A/100 DEG C；
Bridge arm inductance (L1, L2): 0.025mH；
Power device (S1-S3): 600V, 50A/100 DEG C；
The μ of electrolytic capacitor E1:4 × 680 F, two and rear two goes here and there, 400V；
Control circuit operational amplifier (A1, A2, A3): TLC2272；
Pi regulator resistance (R1, R2): 10k Ω；
Pi regulator capacitor (C1, C2): 1 μ F；
Divider resistance (R3, R4, R5, R6): 100k Ω；R7:1k Ω；
Divider resistance (RV1, RV2): 200k Ω；RV3:1k Ω；
Difference amplifier resistance (R8, R9, R10): 1k Ω；
Resistance R12:2k Ω；
R13:12kΩ；
R14:16.5k Ω；
R15:1kΩ；
Ground capacity C5:1nF；
Power vd D:3.3V direct current；
Reference voltage Uref: 5.0V direct current；
Digital signal processor: being used for control module, selects the TMS320F28377 for supporting floating-point operation.
A kind of single-phase AC-DC conversion circuit that net stream is sinusoidal provided in this embodiment, power circuit are single-phase to complete
The power conversion of AC-DC；Its control circuit is pressed to complete to output voltage and the instantaneous detection of network voltage, AD conversion
Simulation trial, digital operation and logical process are carried out according to outer voltage control principle, compensated duty ratio is obtained and forms PWM
Driving pulse controls the switch state of power switch in the power circuit, when so that network voltage being distorted, input current
Remain sinusoidal waveform.Input current remains that sinusoidal single-phase AC-DC becomes when the present embodiment realizes network voltage distortion
It changes, there is the characteristics of control is simple, response quickly, elimination power quality pollution.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (7)
1. a kind of single-phase AC-DC conversion circuit that net stream is sinusoidal, which is characterized in that including power circuit and control circuit, in which:
Power conversion of the power circuit to complete single-phase AC-DC；
The control circuit includes output voltage controlling circuit, power grid voltage detection circuit, voltage lifting circuit and DSP program list
Member；Wherein:
The output voltage controlling circuit is used to obtain the difference of output voltage and reference voltage and adjusts by integrator and PI
After device effect, output voltage control value is obtained, is sent into DSP program unit；
The power grid voltage detection circuit is sent for obtaining the sampled value of power grid instantaneous voltage and after differential amplifier circuit acts on
Enter voltage lifting circuit；
The voltage lifting circuit is used to be lifted the sampled value of the power grid instantaneous voltage of input and is sent into DSP program unit；
The DSP program unit is used to handle the sampled value and output voltage control value of the power grid instantaneous voltage of input,
Revised duty when modulated switching frequency is obtained, PWM driving pulse is formed, controls power in the power circuit and open
The PWM switch state of pass；
The power circuit includes filter circuit and rectification circuit, in which:
The filter circuit is made of LC filter inductance and LC filter capacitor, and wherein one end of LC filter inductance gets access to grid firewire,
The other end of LC filter inductance is followed by grid zero line through LC filter capacitor, constitutes LC filter circuit；
The rectification circuit includes single-phase rectification bridge, the 9th diode, electrolytic capacitor and partial pressure branch；The single-phase rectification bridge by
First to the 8th diode, first to third power switch, the first inductance and the second inductance are constituted, and the of the single-phase rectification bridge
One bridge arm include first to fourth diode, the first power switch and the first inductance, wherein the second diode, third diode,
First power switch and the second inductance form loop checking installation, the cathode of second diode and the three or two pole in bridge arm
The anode connection of pipe, as the midpoint of the first bridge arm, the cathode of the third diode connects the collection of first power switch
Electrode, the emission electrode of first power switch connect one end of first inductance, and the other end of first inductance connects
The anode of second diode is connect, first diode is located at the high-end of the first bridge arm, and the 4th diode is located at the first bridge arm
Low side；Second bridge arm of the single-phase rectification bridge includes the 5th to the 8th diode, the second power switch and the second inductance, wherein
6th diode, the 7th diode, the second power switch and the second inductance, the cathode and the described 7th 2 of the 6th diode
The anode connection of pole pipe, as the midpoint of the second bridge arm, cathode one end of the 7th diode connects the second power switch
Collector, the emission electrode of the second power switch connect one end of the second inductance, and the other end of the second inductance connects the six or two pole
The anode of pipe forms loop checking installation in bridge arm, and the 5th diode is located at the high-end of the second bridge arm, and the 8th diode is located at second
The low side of bridge arm；The third bridge arm of the single-phase rectification bridge is made of third power switch；First bridge arm and the second bridge arm
High-end common cathode be connected, and after the 9th diode formed output voltage anode；First bridge arm and the second bridge arm it is low
It holds common-anode to be connected, and forms output voltage cathode；The midpoint of first bridge arm and the midpoint of the second bridge arm respectively with it is described
The both ends of LC filter capacitor are connected；An electrolytic capacitor in parallel between the output voltage anode and output voltage cathode；It is described
Dividing branch includes concatenated three divider resistances, wherein one end of first divider resistance is connected with output voltage anode, the
The other end of one divider resistance is connected with one end of second divider resistance, and the other end and third of second divider resistance are only
One end of divider resistance is connected, and the other end of third divider resistance is connected with output voltage cathode.
2. the sinusoidal single-phase AC-DC conversion circuit of net stream according to claim 1, which is characterized in that the output voltage
The input terminal of control circuit is connected with the output end of power circuit, the output end and DSP journey of the output voltage controlling circuit
Sequence unit is connected, and the input terminal of the power grid voltage detection circuit is connected with the input terminal of power circuit, the power grid electricity
The output end of detection circuit and the input terminal of voltage lifting circuit is pressed to be connected, the output end and DSP of the voltage lifting circuit
Program unit is connected.
3. the sinusoidal single-phase AC-DC conversion circuit of net stream according to claim 1 or 2, which is characterized in that the output electricity
Pressing control circuit includes first resistor, second resistance, the first operational amplifier, first capacitor and the second capacitor, wherein output electricity
Pressure inputs the negative-phase input of the first operational amplifier after first resistor, with reference to voltage input to the first operational amplifier
Normal phase input end, first capacitor is in parallel with the second capacitor after connecting with second resistance, whole again later to be connected in parallel on the first operation
Between the negative-phase input and output end of amplifier, integrator and pi regulator, the difference of output voltage and reference voltage are constituted
After integrator and pi regulator effect, it is sent into DSP program unit.
4. the sinusoidal single-phase AC-DC conversion circuit of net stream according to claim 1 or 2, which is characterized in that the power grid electricity
Pressure detection circuit includes third to eleventh resistor, third capacitor, the 4th capacitor and second operational amplifier, wherein the 7th electricity
Resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance bleeder circuit in series, the both ends of the 7th resistance pass through respectively
It is grounded after third capacitor and the 4th capacitor, power grid instantaneous voltage is sampled after the effect of the partial pressure of bleeder circuit；Second operation
The positive and negative-phase input of amplifier are connected the 8th resistance and the 9th resistance respectively, the negative-phase input of second operational amplifier
The tenth resistance in parallel again between output end, and the normal phase input end of second operational amplifier is grounded after eleventh resistor, with
This constitutes differential amplifier circuit, and the sampled value of power grid instantaneous voltage is sent into voltage and is lifted circuit after differential amplifier circuit acts on.
5. the sinusoidal single-phase AC-DC conversion circuit of net stream according to claim 4, which is characterized in that the 3rd resistor,
The resistance value of 4th resistance, the 5th resistance and the 6th resistance is all larger than the resistance value of the 7th resistance, the 8th resistance and the 9th resistance
Resistance value it is equal.
6. the sinusoidal single-phase AC-DC conversion circuit of net stream according to claim 1 or 2, which is characterized in that the voltage lift
Rising circuit includes the 12nd to the 15th resistance, third operational amplifier and the 5th capacitor, wherein additional power source is through the 14th
The normal phase input end of third operational amplifier, one end ground connection of twelfth resistor, the other end of twelfth resistor are inputted after resistance
It is connected with thirteenth resistor, thirteenth resistor is connected in parallel between the negative-phase input and output end of third operational amplifier, and the tenth
Two resistance and 13 resistance play the role of partial pressure, the voltage that twelfth resistor is got to the output end voltage of third operational amplifier
The negative-phase input of third operational amplifier is inputted, the 15th resistance is connected on the output end of third operational amplifier, Zhi Houzai
Through the 5th capacity earth, the sampled value of power grid instantaneous voltage is sent into DSP program unit after being lifted.
7. the sinusoidal single-phase AC-DC conversion circuit of net stream according to claim 1 or 2, which is characterized in that the DSP journey
Sequence unit includes six digital modules: the first ADC module, the second ADC module, phase-locked loop module, desired voltage computing module, wink
When duty ratio computing module and pwm pulse occur module；Wherein:
The input terminal of first ADC module is connected with the output end of the output voltage controlling circuit, by output voltage control
Value analog quantity is converted to current duty cycle, is re-fed into the first entrance of the instantaneous duty ratio computing module；
The input terminal of second ADC module is connected with the output end of voltage lifting circuit, and the power grid after lifting is instantaneous
The sampled value analog quantity of voltage is converted to digital quantity, is re-fed into the phase-locked loop module and the instantaneous duty ratio computing module
Third entrance；
The input terminal of the phase-locked loop module is connected with the output end of the second ADC module, by the sampled value of power grid instantaneous voltage
Phase is fixed, and eliminating influences caused by electric network voltage phase drift, is re-fed into the second entrance of the desired voltage computing module；
The ideal grid voltage amplitude of first entrance input of the desired voltage computing module, the second of desired voltage computing module
Entrance is connected with the output end of the phase-locked loop module, and two entrance input values of desired voltage computing module obtain ideal after being multiplied
The corresponding digital quantity sampled value of network voltage is re-fed into the second entrance of the instantaneous duty ratio computing module；
The first entrance of the instantaneous duty ratio computing module is connected with the output end of first ADC module, instantaneous duty ratio
The second entrance of computing module is connected with the output end of the desired voltage computing module, the third of instantaneous duty ratio computing module
Entrance is connected with the output end of second ADC module；Instantaneous duty ratio computing module uses L' Hospital's ruler, to ideal power grid
The ratio of voltage and current electric grid voltage carries out evolution, obtains modulation duty cycle multiplied by the duty ratio of current driving pulse, then send
Enter the first entrance that module occurs for the pwm pulse；
The first entrance that module occurs for the pwm pulse is connected with the output end of the instantaneous duty ratio computing module, for defeated
Enter modulation duty cycle, the second entrance that module occurs for pwm pulse is used to input the period of PWM driving pulse, and mould occurs for pwm pulse
Two entrance input values of block generate modulation (PWM) driving pulse after being multiplied；The output end of the DSP program unit and power electricity
The base stage of power switch is connected in road.
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| CN201710823716.5A CN107437899B (en) | 2017-09-13 | 2017-09-13 | The sinusoidal single-phase AC-DC conversion circuit of net stream |
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| CN201710823716.5A CN107437899B (en) | 2017-09-13 | 2017-09-13 | The sinusoidal single-phase AC-DC conversion circuit of net stream |
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| CN102097929A (en) * | 2011-03-18 | 2011-06-15 | 上海交通大学 | Single-level power factor corrector controlled by complete open loop |
| CN104471816B (en) * | 2012-06-01 | 2019-01-15 | 香港大学 | It inputs AC voltage and controls bi-directional power converter |
| CN103326556B (en) * | 2013-05-14 | 2015-10-28 | 上海交通大学 | The single-phase AC-DC conversion circuit of directive overrurrent relay |
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