CN103326556B - The single-phase AC-DC conversion circuit of directive overrurrent relay - Google Patents
The single-phase AC-DC conversion circuit of directive overrurrent relay Download PDFInfo
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- CN103326556B CN103326556B CN201310178941.XA CN201310178941A CN103326556B CN 103326556 B CN103326556 B CN 103326556B CN 201310178941 A CN201310178941 A CN 201310178941A CN 103326556 B CN103326556 B CN 103326556B
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Abstract
The invention provides a kind of single-phase AC-DC conversion circuit of directive overrurrent relay, comprise power circuit, auxiliary circuit and control module, described power circuit is in order to complete the power conversion of single-phase AC-DC; Various detected value in order to complete the instantaneous detection of input voltage, input current, output voltage and the driving to original pwm pulse, and is exported to described control module by described auxiliary circuit; After described control module accepts the various detected value of described auxiliary circuit, digital operation and logical process is carried out according to Direct Power and double-loop control principle, and obtain final original driving pulse, described power circuit is transported to after overdriving, control the break-make rule of power device, described power circuit is made to complete power factor correction, and the direct voltage of stable output.The present invention realizes the single-phase AC-DC conversion of netting side unity power factor, has fast response time, and antijamming capability is strong, adapts to relative broad range load variations, and has power follower characteristic.
Description
Technical field
The present invention relates to a kind of single-phase power factor correcting device (PFC) of Technics of Power Electronic Conversion technical field, particularly, relate to a kind of single-phase AC-DC conversion circuit of directive overrurrent relay.
Background technology
In order to improve the net side power factor of the Single-phase AC-DC converters adopting rectifier bridge, reducing the harm of harmonic current, reducing harmonic current interference, making it meet the relevant criterion of harmonic current, need to adopt single-phase active power factor correction (PFC) technology.Single-phase active power factor correction technology has various control strategy, as traditional double-closed-loop control, obtains good calibration result.Adopt the single-phase active PFC of double-closed-loop control, power factor correction is effective, but dynamic response is slow, and robustness is poor.In principle, double-closed-loop control needs to adopt outer voltage at a slow speed, carrys out stable output dc voltage with this.Conventional voltage outer shroud generally adopts voltage error amplifier, and does not adopt PID adjuster.The inertia of voltage error amplifier is comparatively large, have impact on the dynamic responding speed of double-closed-loop control, the application scenario of inapplicable Fast Load change.
Directive overrurrent relay control is a kind of change of power according to demand, carry out bang-bang control, obtain in the converters field of the FACTS categories such as Three-Phase PWM Rectifier, three-phase active power filter and three-way tide current controller and study widely, have and respond advantage fast.In single-phase active PFC field, still there is no the example that this respect is applied.
Through the retrieval of the single-phase active power factor corrector prior art to employing double-closed-loop control principle, find to mainly contain following representative document:
[1] Li Dong and Ruan Xinbo. " high efficiency BOOST type power factor correction preconditioner ". Proceedings of the CSEE .V24, No.10,2004.10:153-156, its technical characteristics is as follows: adopt UC3854BN analog controller, voltage error amplifier is as outer voltage, and response speed is affected.
[2] He Zhiyuan and Wei Wei. " controlling research based on the PWM rectifier directive overrurrent relay of Virtual shipyard ". journal of Zhejiang university .V38, No.12,2004.11:1619-1622, its technical characteristics is as follows: three-phase rectifier, fast response time, but owing to adopting bang-bang control, bring switching frequency to suddenly change but introduce disturbance and noise, the reliability of reduction system, even makes the performance of system worsen.
More than comprehensive, the retrieval of single-phase active power factor corrector prior art is found, directive overrurrent relay controls to have the fast advantage of response, and traditional directive overrurrent relay control switch frequency acute variation brings the latent instability problem of system, and outer voltage limits the response speed of traditional double closed-loop control.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of single-phase AC-DC conversion circuit of directive overrurrent relay, realize the AC-DC converter of unit input power factor, be applicable to wide load applications, there is the advantages such as circuit is simple, control is convenient simultaneously.
The invention provides a kind of single-phase AC-DC conversion circuit of directive overrurrent relay, comprise power circuit, auxiliary circuit and control module, wherein: described power circuit is in order to complete the power conversion of single-phase AC-DC; Various detected value in order to complete the instantaneous detection of input voltage, input current, output voltage and the driving to original pwm pulse, and is exported to described control module by described auxiliary circuit; After described control module accepts the various detected value of described auxiliary circuit, digital operation and logical process is carried out according to Direct Power and double-loop control principle, and obtain final original driving pulse, described power circuit is transported to after overdriving, control the break-make rule of power device, described power circuit is made to complete power factor correction, and the direct voltage of stable output.
Preferably, described power circuit comprises rectification circuit, booster circuit, shunt circuit and bleeder circuit, wherein:
Described rectification circuit comprise be parallel to net side ac capacitor and by first, second, 3rd, the single-phase rectification bridge that 4th diode is formed, the two ends of described ac capacitor are parallel to alternating current net side, first brachium pontis of described single-phase rectification bridge comprises the first diode and second diode of series connection, second brachium pontis of described single-phase rectification bridge comprises the 3rd diode and the 4th diode of series connection, described first, the high-end common cathode of the second brachium pontis is connected to form positive pole, described first, the low side common anode pole of the second brachium pontis is connected to form negative pole, described first, the mid point of the second brachium pontis is connected with the two ends of described ac capacitor,
Described booster circuit comprises boost inductance, oppositely fast recovery diode, chopped power device and electrochemical capacitor, one end of described boost inductance is connected with the described single-phase rectification bridge positive pole in described rectification circuit, the other end is connected with the anode of described reverse fast recovery diode, the collector electrode of described chopped power device, the negative electrode of described reverse fast recovery diode is connected with the positive pole of described electrochemical capacitor and forms direct current output cathode afterwards, and the emission electrode of described chopped power device is connected with the negative pole of described electrochemical capacitor and forms direct current output negative pole afterwards;
Described shunt circuit is a shunt resistance, one end of described shunt resistance is connected with the negative pole of the described single-phase rectification bridge in described rectification circuit, and the other end is connected with the emission electrode of described chopped power device in described booster circuit, the negative pole of described electrochemical capacitor;
Described bleeder circuit comprises middle bleeder circuit and exports bleeder circuit, the second resistance of rectification circuit output end, the 3rd resistance is parallel to after described middle bleeder circuit comprises series connection, one end of described second resistance is connected with the positive pole of the described single-phase rectification bridge in described rectification circuit, the other end is connected with one end of described 3rd resistance, and the described other end of the 3rd resistance is connected with one end of the described shunt resistance in the negative pole of the described single-phase rectification bridge in described rectification circuit, described shunt circuit; The 4th resistance of DC output end, the 5th resistance is parallel to after described output bleeder circuit comprises series connection, one end of described 4th resistance is connected with described direct current output cathode, the other end is connected with one end of described 5th resistance, the other end of described 5th resistance is connected with described direct current output negative pole, and namely the negative pole of the other end of described shunt resistance, the emission electrode of described chopped power device, described electrochemical capacitor is connected.
Preferably, described auxiliary circuit comprises input voltage detection circuit, input electric cur-rent measure circuit, output voltage detecting circuit and driving pulse amplifying circuit, wherein:
The input of described input voltage detection circuit is connected with the described middle bleeder circuit mid point in described power circuit, described input electric cur-rent measure circuit is connected with the described shunt resistance one end in described power circuit, described output voltage detecting circuit is connected with the described output bleeder circuit mid point in described power circuit, and the output of described driving pulse amplifying circuit is connected with the gate pole of the described chopped power device in described power circuit.
Preferably, described control module has comprised eight digital modules of control algolithm, is divided into voltage squared to control outer shroud module and Current Control inner ring module, wherein:
Described voltage squared controls outer shroud module and comprises a digital module, i.e. voltage squared PI adjustment module, and the first entrance of described voltage squared PI adjustment module is connected with the described output voltage detecting circuit output in described auxiliary circuit; Second entrance is given voltage squared, exports and is connected with the second entrance of the input power requirements computing module in described Current Control inner ring module.
Described Current Control inner ring module comprises seven digital modules, namely input voltage effective value computing module, input current effective value computing module, input power mean value calculation module, input power requirements computing module, input current reference value computing module, current PI adjustment module and driving pulse form module, wherein:
The entrance of described input voltage effective value computing module is connected with the described input voltage detection circuit output in described auxiliary circuit, exports and is connected with the first entrance of described input power mean value calculation module;
The entrance of described input current effective value computing module is connected with the described input electric cur-rent measure circuit output end in described auxiliary circuit, exports and is connected with the second entrance of described input power mean value calculation module;
The outlet of described input power mean value calculation module is connected with the first entrance of described input power requirements computing module;
The outlet of described input power requirements computing module is connected with the first entrance of described input current reference value computing module;
Second entrance of described input current reference value computing module is connected with the described input voltage detection circuit output in described auxiliary circuit, exports and is connected with the second entrance of described current PI adjustment module;
First entrance of described current PI adjustment module is connected with the described input electric cur-rent measure circuit output end in described auxiliary circuit, exports the entrance forming module with described driving pulse and is connected;
Described driving pulse forms the outlet of module and is connected with the input of the described driving pulse amplifying circuit in described auxiliary circuit.
Operation principle of the present invention is the repertoire adopting power circuit, auxiliary circuit and control module to realize the single-phase AC-DC conversion circuit of directive overrurrent relay, described control module is in order to realize the direct net side power control algorithm of single-phase power factor correcting device, concrete:
Described voltage squared PI adjustment module belongs to voltage squared and controls outer shroud module, be responsible for the VD instantaneous value obtained according to described output voltage detecting circuit measurement, it is asked square, what then given voltage squared is deducted output voltage instantaneous value square obtains the difference of two squares, then proportional integral adjustment is carried out to the difference of two squares, obtain the controlled quentity controlled variable of control voltage square, the controlled quentity controlled variable of this controlled quentity controlled variable reflection power output changes in demand amount is also maintain the constant controlled quentity controlled variable of output voltage stabilization simultaneously;
Described input voltage effective value computing module is responsible for the input voltage instantaneous value obtained according to described input voltage detection circuit measurement, adopt the input voltage instantaneous value of method process half power cycle of sliding window, calculate the input voltage effective value that real-time is higher;
Described input current effective value computing module is responsible for the input current instantaneous value obtained according to described input electric cur-rent measure circuit measuring, the i.e. terminal voltage of described shunt resistance, reflect the instantaneous value of the electric current of described boost inductance, adopt the input current instantaneous value of method process half power cycle of sliding window, calculate the input current effective value that real-time is higher;
The input current effective value that the input voltage effective value that described input voltage effective value computing module calculates by described input power mean value calculation module in charge and described input current effective value computing module calculate is multiplied, and obtains the current actual input power that real-time is stronger;
The controlled quentity controlled variable that described input power requirements computing module is responsible for the reflection power output changes in demand amount of current actual input power and the described voltage squared PI adjustment module output described input power mean value calculation module obtained is added, obtain the overall power requirement that current needs obtain from electrical network, i.e. DC quantity;
Described input current reference value computing module is the overall power requirement obtained from electrical network by above-mentioned current needs, divided by input voltage instantaneous value, obtain the instantaneous value of input current, i.e. the reference current of current inner loop, this reference current is admitted to described current PI adjustment module;
Above-mentioned reference current is deducted input electric cur-rent measure value by described current PI adjustment module, obtains offset current, then carries out proportional integral adjustment, obtains finally similar sinusoidal wave duty cycle functions, sends into described driving pulse and form module;
Described driving pulse forms module in charge and duty cycle functions obtained above is converted to original PWM signals, and this signal sends into the described driving pulse amplifying circuit in described auxiliary circuit;
Described driving pulse amplifying circuit exports the pwm pulse with driving force, sends into described power circuit, drives the break-make of described chopped power device to run, finally complete the function of PFC.
Compared with prior art, the present invention has following beneficial effect:
Directive overrurrent relay organically controls to combine with double-loop control by the present invention, the control module of design single-phase active PFC, utilizes and directly controls the fast feature design voltage of power dynamic response square control outer shroud module, adapt to load variations fast, but do not adopt bang-bang control, switching frequency is constant; Adopt directive overrurrent relay to control outer shroud, also help the power following feature realizing single-phase active PFC, when heavier loads, output dc voltage on average declines, otherwise increases, and result is conducive to improving the design difficulty of boost inductance in power circuit; The design of control module is more flexible and efficient, and dynamic and static state performance is promoted, and can adapt to the change at random of load, and no matter heavy duty or underloading, can obtain higher power factor correction effect.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the schematic diagram of the single-phase AC-DC conversion circuit of directive overrurrent relay of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
As shown in Figure 1, the present embodiment provides a kind of single-phase AC-DC conversion circuit of directive overrurrent relay, comprise power circuit 1, auxiliary circuit 2 and control module 3, wherein: described power circuit 1 completes the power conversion of single-phase AC-DC, described auxiliary circuit 2 completes input voltage, input current, the instantaneous detection of output voltage and the driving to original pwm pulse, after described control module 3 accepts the various detection electricity of described auxiliary circuit 2, digital operation and logical process is carried out according to directive overrurrent relay control and double-closed-loop control principle, and obtain original driving pulse, finally complete power factor correction by described power circuit 1, and the direct voltage of stable output.
Described in the present embodiment, power circuit 1 comprises rectification circuit, booster circuit, shunt circuit and bleeder circuit,
Described rectification circuit comprise be parallel to net side ac capacitor C1 and by the first diode D1, second diode D2, 3rd diode D3, the single-phase rectification bridge B1 that 4th diode D4 is formed, wherein: the two ends of described ac capacitor C1 are parallel to alternating current net side, first brachium pontis of described single-phase rectification bridge B1 comprises the first diode D1 and the second diode D2 of series connection, second brachium pontis of described first single-phase rectification bridge B1 comprises the 3rd diode D3 and the 4th diode D4 of series connection, described first, the high-end common cathode of the second brachium pontis is connected to form positive pole, described first, the low side common anode pole of the second brachium pontis is connected to form negative pole, described first, the mid point of the second brachium pontis is connected with the two ends of described ac capacitor C1,
Described booster circuit comprises boost inductance L1, reverse fast recovery diode FRD1, chopped power device S1 and electrochemical capacitor E1, wherein: one end of described boost inductance L1 is connected with described single-phase rectification bridge B1 positive pole, the anode of the other end and described reverse fast recovery diode FRD1, the collector electrode of described chopped power device S1 is connected, the negative electrode of described reverse fast recovery diode FRD1 is connected with the positive pole of described electrochemical capacitor E1 and forms direct current output cathode afterwards, the emission electrode of described chopped power device S1 is connected with the negative pole of described electrochemical capacitor E1 and forms direct current output negative pole afterwards,
Described shunt circuit comprises a shunt resistance R1, and one end of described shunt resistance R1 is connected with the negative pole of described single-phase rectification bridge B1, and the other end is connected with the emission electrode of described chopped power device S1, the negative pole of described electrochemical capacitor E1;
Described bleeder circuit comprises middle bleeder circuit and exports bleeder circuit, wherein: after described middle bleeder circuit comprises series connection, be parallel to the second resistance R2 of rectification circuit output end, the 3rd resistance R3, one end of described second resistance R2 is connected with the positive pole of described single-phase rectification bridge B1, the other end is connected with one end of described 3rd resistance R3, and the other end of described 3rd resistance R3 is connected with one end of the negative pole of described single-phase rectification bridge B1, described shunt resistance R1; The 4th resistance R4 of DC output end, the 5th resistance R5 is parallel to after described output bleeder circuit comprises series connection, R4 one end of described 4th resistance is connected with the positive pole of described single-phase rectification bridge B1, the other end is connected with one end of described 5th resistance R5, and the other end of described 5th resistance R5 is connected with the other end of described shunt resistance R1, the emitter of described chopped power device S1, the negative pole of described electrochemical capacitor E1;
Preferably, described auxiliary circuit 2 comprises input voltage detection circuit P1, input electric cur-rent measure circuit P2, output voltage detecting circuit P3 and driving pulse amplifying circuit P4, wherein: the input of described input voltage detection circuit P1 is connected with the described middle bleeder circuit mid point in described power circuit 1, described input electric cur-rent measure circuit P2 is connected with the described shunt resistance R1 one end in described power circuit 1, described output voltage detecting circuit P3 is connected with the described output bleeder circuit mid point in described power circuit 1, the output of described driving pulse amplifying circuit P4 is connected with the gate pole of the described chopped power device S1 in described power circuit 1.
Preferably, described control module 3 has comprised eight digital modules of control algolithm, is divided into voltage squared to control outer shroud module and Current Control inner ring module, wherein:
Described voltage squared controls outer shroud module and comprises a digital module, i.e. voltage squared PI adjustment module U5, and first entrance of described voltage squared PI adjustment module U5 is connected with the described output voltage detecting circuit P3 output in described auxiliary circuit 2; Second entrance is given voltage squared, exports and is connected with second entrance of the input power requirements computing module U4 in described Current Control inner ring module.
Described Current Control inner ring module comprises seven digital modules, namely input voltage effective value computing module U1, input current effective value computing module U2, input power mean value calculation module U3, input power requirements computing module U4, input current reference value computing module U6, current PI adjustment module U7 and driving pulse form module U8, wherein:
The entrance of described input voltage effective value computing module U1 is connected with the described input voltage detection circuit P1 output in described auxiliary circuit 2, exports and is connected with first entrance of described input power mean value calculation module U3;
The entrance of described input current effective value computing module U2 is connected with the described input electric cur-rent measure circuit P2 output in described auxiliary circuit 2, exports and is connected with second entrance of described input power mean value calculation module U3;
The outlet of described input power mean value calculation module U3 is connected with first entrance of described input power requirements computing module U4;
The outlet of described input power requirements computing module U4 is connected with first entrance of described input current reference value computing module U6;
Second entrance of described input current reference value computing module U6 is connected with the described input voltage detection circuit P1 output in described auxiliary circuit 2, exports and is connected with second entrance of described current PI adjustment module U7;
First entrance of described current PI adjustment module U7 is connected with the described input electric cur-rent measure circuit P2 output in described auxiliary circuit 2, exports the entrance forming module U8 with described driving pulse and is connected;
Described driving pulse forms the outlet of module U8 and is connected with the input of the described driving pulse amplifying circuit P4 in described auxiliary circuit 2.
The present embodiment adopts described power circuit 1, described auxiliary circuit 2 and described control module 3 realize the repertoire of the single-phase AC-DC conversion circuit of directive overrurrent relay, described power circuit 1 is the power circuit of traditional single-phase active PFC, described auxiliary circuit 2 also comprises the various testing circuit of necessary electricity and the drive circuit of power device in conventional power circuit, difference have employed directly towards netting the control algolithm of side power to realize the function of single-phase active PFC, described control module 3 is core, be used for realizing the direct net side power control algorithm of single-phase power factor correcting device, concrete:
Described voltage squared PI adjustment module U5 is responsible for the VD instantaneous value obtained according to described output voltage detecting circuit P3 measurement, it is asked square, what then given voltage squared (the actual given voltage for obtaining after square) is deducted output voltage instantaneous value square obtains the difference of two squares, then proportional integral adjustment (PI) is carried out to the difference of two squares, obtain the controlled quentity controlled variable of control voltage square, the controlled quentity controlled variable of this controlled quentity controlled variable reflection power output changes in demand amount is also maintain the constant controlled quentity controlled variable of output voltage stabilization simultaneously;
Described input voltage effective value computing module U1 is responsible for the input voltage instantaneous value obtained according to described input voltage detection circuit P1 measurement, adopt the input voltage instantaneous value of method process half power cycle of sliding window, calculate the input voltage effective value that real-time is higher;
Described input current effective value computing module U2 is responsible for the input current instantaneous value obtained according to described input electric cur-rent measure circuit P2 measurement, the i.e. terminal voltage of described shunt resistance R1, reflect the current instantaneous value of described boost inductance L1, adopt the input current instantaneous value of method process half power cycle of sliding window, calculate the input current effective value that real-time is higher;
The input voltage effective value that described input power mean value calculation module U3 is responsible for described input voltage effective value computing module U1 to calculate is multiplied with the input current effective value that described input current effective value computing module U2 calculates, and obtains the current actual input power that real-time is stronger;
The controlled quentity controlled variable that described input power requirements computing module U4 is responsible for the reflection power output changes in demand amount of current actual input power and the described voltage PI adjustment module U5 output obtained by described input power mean value calculation module U3 is added, obtain the overall power requirement that current needs obtain from electrical network, i.e. DC quantity;
The overall power requirement that the current needs that described input power requirements computing module U4 obtains obtain from electrical network by described input current reference value computing module U6, divided by input voltage instantaneous value, obtain the instantaneous value of input current, the i.e. reference current of current inner loop, this reference current is admitted to described current PI adjustment module U7;
The reference current that described input current reference value computing module U6 obtains is deducted input electric cur-rent measure value by described current PI adjustment module U7, obtain offset current, carry out proportional integral adjustment again, obtain finally similar sinusoidal wave duty cycle functions, send into described driving pulse and form module U8;
The duty cycle functions that described driving pulse formation module U8 is responsible for described current PI adjustment module U7 obtains is converted to original PWM signals, and this signal sends into the described driving pulse amplifying circuit P4 of described auxiliary circuit 2;
Described driving pulse amplifying circuit P4 exports the pwm pulse with driving force, sends into described power circuit 1, drives the break-make of described chopped power device S1 to run, finally complete the function of PFC.
In this example: AC-input voltage wide region, 85VAC ~ 264VAC, power frequency, nominal input voltage 220VAC, specified output dc voltage mean value 385VDC, ripple voltage peak-to-peak value is 10V, rated output power 3.5kW, and power base value is 3.5kW.
Switching frequency: 35kHz;
Ac capacitor C1:275V, 1.0 μ F ~ 2.2 μ F, plug-in unit;
Single-phase rectification bridge B1(D1 ~ D4): 600V, 25A/100 ° of C, flat bridge, plug-in unit;
Boost inductance L1:350 μ H, plug-in unit;
Chopped power device S1:600V, 50A/100 ° of C;
Reverse fast recovery diode FRD1:600V, 35A/100 ° C;
Electrochemical capacitor E1:4x680 μ F, 400V;
Shunt resistance R1:15m Ω, 2W;
Divider resistance R2:150k Ω, 1/2W, plug-in unit;
Divider resistance R3:1k Ω, 1/2W, plug-in unit;
Divider resistance R4:200k Ω, 1/2W, plug-in unit;
Divider resistance R5:1k Ω, 1/2W, plug-in unit;
Reference voltage square Uref:2.0V
2;
Auxiliary circuit: conventional filter circuit and drive circuit;
Digital signal processor: for control module, selects the TMS320F28355 supporting floating-point operation.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (5)
1. a single-phase AC-DC conversion circuit for directive overrurrent relay, is characterized in that comprising power circuit, auxiliary circuit and control module, wherein: described power circuit is in order to complete the power conversion of single-phase AC-DC conversion circuit; Various detected value in order to complete the instantaneous detection of input voltage, input current, output voltage and the driving to original pwm pulse, and is exported to described control module by described auxiliary circuit; After described control module accepts the various detected values of described auxiliary circuit output, digital operation and logical process is carried out according to Direct Power and double-loop control principle, and obtain final original driving pulse, described power circuit is transported to after overdriving, control the break-make of power device, described power circuit is made to complete power factor correction, and the direct voltage of stable output;
Described control module comprises voltage squared and controls outer shroud module and Current Control inner ring module, and described voltage squared controls outer shroud module and comprises voltage squared PI adjustment module; Described Current Control inner ring module comprises input voltage effective value computing module, input current effective value computing module, input power mean value calculation module, input power requirements computing module, input current reference value computing module, current PI adjustment module and driving pulse and forms module, wherein:
Described voltage squared PI adjustment module, be responsible for the VD instantaneous value obtained according to the output voltage detecting circuit measurement in described auxiliary circuit, it is asked square, what then given voltage squared is deducted output voltage instantaneous value square obtains the difference of two squares, then proportional integral adjustment is carried out to the difference of two squares, obtain the controlled quentity controlled variable of control voltage square, the controlled quentity controlled variable of this controlled quentity controlled variable reflection power output changes in demand amount is also maintain the constant controlled quentity controlled variable of output voltage stabilization simultaneously;
Described input voltage effective value computing module is responsible for the input voltage instantaneous value obtained according to the input voltage detection circuit measurement in described auxiliary circuit, adopt the input voltage instantaneous value of method process half power cycle of sliding window, calculate input voltage effective value;
Described input current effective value computing module is responsible for the input current instantaneous value obtained according to the input electric cur-rent measure circuit measuring in described auxiliary circuit, the terminal voltage of the shunt resistance namely in described power circuit, reflect the instantaneous value of the electric current of the boost inductance in described power circuit, adopt the input current instantaneous value of method process half power cycle of sliding window, calculate input current effective value;
The input current effective value that the input voltage effective value that described input voltage effective value computing module calculates by described input power mean value calculation module in charge and described input current effective value computing module calculate is multiplied, and obtains current actual input power;
The controlled quentity controlled variable that described input power requirements computing module is responsible for the reflection power output changes in demand amount of current actual input power and the described voltage squared PI adjustment module output described input power mean value calculation module obtained is added, obtaining the overall power requirement that current needs obtain from electrical network, is DC quantity;
Described input current reference value computing module is the overall power requirement obtained from electrical network by above-mentioned current needs, divided by input voltage instantaneous value, obtain the instantaneous value of input current, i.e. the reference current of current inner loop, this reference current is admitted to described current PI adjustment module;
Above-mentioned reference current is deducted input electric cur-rent measure value by described current PI adjustment module, obtains offset current, then carries out proportional integral adjustment, obtains final sinusoidal wave duty cycle functions, sends into described driving pulse and forms module;
Described driving pulse forms module in charge and duty cycle functions obtained above is converted to original PWM signals, and this signal sends into the driving pulse amplifying circuit of described auxiliary circuit;
Described driving pulse amplifying circuit exports the pwm pulse with driving force, sends into described power circuit, drives the break-make of chopped power device to run, finally completes the function of PFC.
2. the single-phase AC-DC conversion circuit of a kind of directive overrurrent relay according to claim 1, is characterized in that, described power circuit comprises rectification circuit, booster circuit, shunt circuit and bleeder circuit, wherein:
Described rectification circuit comprise be parallel to net side ac capacitor and by first, second, 3rd, the single-phase rectification bridge that 4th diode is formed, the two ends of described ac capacitor are parallel to alternating current net side, first brachium pontis of described single-phase rectification bridge comprises the first diode and second diode of series connection, second brachium pontis of described single-phase rectification bridge comprises the 3rd diode and the 4th diode of series connection, described first, the high-end common cathode of the second brachium pontis is connected to form positive pole, described first, the low side common anode pole of the second brachium pontis is connected to form negative pole, described first, the mid point of the second brachium pontis is connected with the two ends of described ac capacitor,
Described booster circuit comprises boost inductance, oppositely fast recovery diode, chopped power device and electrochemical capacitor, one end of described boost inductance is connected with the described single-phase rectification bridge positive pole in described rectification circuit, the other end is connected with the anode of described reverse fast recovery diode, the collector electrode of described chopped power device, the negative electrode of described reverse fast recovery diode is connected with the positive pole of described electrochemical capacitor and forms direct current output cathode afterwards, and the emission electrode of described chopped power device is connected with the negative pole of described electrochemical capacitor and forms direct current output negative pole afterwards;
Described shunt circuit is a shunt resistance, one end of described shunt resistance is connected with the negative pole of the described single-phase rectification bridge in described rectification circuit, and the other end is connected with the emission electrode of described chopped power device in described booster circuit, the negative pole of described electrochemical capacitor;
Described bleeder circuit comprises middle bleeder circuit and exports bleeder circuit, the second resistance of rectification circuit output end, the 3rd resistance is parallel to after described middle bleeder circuit comprises series connection, one end of described second resistance is connected with the positive pole of the described single-phase rectification bridge in described rectification circuit, the other end is connected with one end of described 3rd resistance, and the described other end of the 3rd resistance is connected with one end of the described shunt resistance in the negative pole of the described single-phase rectification bridge in described rectification circuit, described shunt circuit; The 4th resistance of DC output end, the 5th resistance is parallel to after described output bleeder circuit comprises series connection, one end of described 4th resistance is connected with described direct current output cathode, the other end is connected with one end of described 5th resistance, the other end of described 5th resistance is connected with described direct current output negative pole, and namely the negative pole of the other end of described shunt resistance, the emission electrode of described chopped power device, described electrochemical capacitor is connected.
3. the single-phase AC-DC conversion circuit of a kind of directive overrurrent relay according to claim 2, is characterized in that, described auxiliary circuit comprises input voltage detection circuit, input electric cur-rent measure circuit, output voltage detecting circuit and driving pulse amplifying circuit, wherein:
The input of described input voltage detection circuit is connected with the described middle bleeder circuit mid point in described power circuit, described input electric cur-rent measure circuit is connected with the described shunt resistance one end in described power circuit, described output voltage detecting circuit is connected with the described output bleeder circuit mid point in described power circuit, and the output of described driving pulse amplifying circuit is connected with the gate pole of the described chopped power device in described power circuit.
4. the single-phase AC-DC conversion circuit of a kind of directive overrurrent relay according to any one of claim 1-3, it is characterized in that, described voltage squared controls outer shroud module and comprises voltage squared PI adjustment module, and the first entrance of described voltage squared PI adjustment module is connected with the output voltage detecting circuit output of described auxiliary circuit; Second entrance is given voltage squared, exports and is connected with the second entrance of the input power requirements computing module of described Current Control inner ring module.
5. the single-phase AC-DC conversion circuit of a kind of directive overrurrent relay according to any one of claim 1-3, it is characterized in that, described Current Control inner ring module comprises input voltage effective value computing module, input current effective value computing module, input power mean value calculation module, input power requirements computing module, input current reference value computing module, current PI adjustment module and driving pulse and forms module, wherein:
The entrance of described input voltage effective value computing module is connected with the described input voltage detection circuit output of described auxiliary circuit, exports and is connected with the first entrance of described input power mean value calculation module;
The entrance of described input current effective value computing module is connected with the described input electric cur-rent measure circuit output end in described auxiliary circuit, exports and is connected with the second entrance of described input power mean value calculation module;
The outlet of described input power mean value calculation module is connected with the first entrance of described input power requirements computing module;
The outlet of described input power requirements computing module is connected with the first entrance of described input current reference value computing module;
Second entrance of described input current reference value computing module is connected with the described input voltage detection circuit output in described auxiliary circuit, exports and is connected with the second entrance of described current PI adjustment module;
First entrance of described current PI adjustment module is connected with the described input electric cur-rent measure circuit output end in described auxiliary circuit, exports the entrance forming module with described driving pulse and is connected;
Described driving pulse forms the outlet of module and is connected with the input of the described driving pulse amplifying circuit in described auxiliary circuit.
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| DE112015003619T5 (en) * | 2014-08-05 | 2017-04-27 | Murata Manufacturing Co., Ltd. | POWER SUPPLY |
| CN104330616B (en) * | 2014-11-05 | 2017-06-06 | 中国科学院电工研究所 | A kind of power network alternating current virtual value real-time detection method |
| CN105006975B (en) * | 2015-08-07 | 2017-11-14 | 西南交通大学 | LLC resonant converter method for controlling frequency conversion and its device |
| CN107979278A (en) * | 2016-10-24 | 2018-05-01 | 南京理工大学 | A kind of width load step-up type power factor correcting converter |
| CN107437899B (en) * | 2017-09-13 | 2019-08-23 | 上海交通大学 | The sinusoidal single-phase AC-DC conversion circuit of net stream |
| CN109831187B (en) * | 2019-03-28 | 2021-01-05 | 上海交通大学 | Variable-frequency triangular carrier generation circuit |
| TWI700962B (en) * | 2019-07-19 | 2020-08-01 | 峒鑫科技股份有限公司 | Lighting device |
| CN113726170B (en) * | 2021-07-14 | 2023-07-14 | 合肥工业大学 | LLC resonant circuit control method based on current feedback |
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