CN102769376B - Power factor correction device, AC/DC converter and power factor correction method - Google Patents

Power factor correction device, AC/DC converter and power factor correction method Download PDF

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Publication number
CN102769376B
CN102769376B CN201210275208.5A CN201210275208A CN102769376B CN 102769376 B CN102769376 B CN 102769376B CN 201210275208 A CN201210275208 A CN 201210275208A CN 102769376 B CN102769376 B CN 102769376B
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electric energy
description value
value
input
output
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CN102769376A (en
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朱樟明
马强
许刚颖
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Chengdu Qi Chen electronic Limited by Share Ltd
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CHENGDU CHIP-RAIL MICROELECTRONIC Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a power factor correction device, an AC/DC converter and a power factor correction method. In order to fit the running environments with different loads, input electrical energy and load feedback electrical energy codetermine electrical energy generated on a primary winding, wherein electrical energy sampled on the primary winding is determined based on a reference electrical energy generated by the input electrical energy and the load feedback electrical energy; in order to fit the application situation of load change, an electrical energy environment on the primary winding can be self-adaptively adjusted so that the electrical energy acquired on the primary winding and the input energy are ensured to be the same phase; therefore, the invention effectively reduces the power consumption of the AC/DC inverter, reduces the pollution of a power grid and improves the power efficiency.

Description

Power factor correction device, AC-DC converter and power factor correction method
Technical field
The present invention relates to electronic circuit technology field, relate in particular to a kind of power factor correction device, AC-DC converter and power factor correction method.
Background technology
The high speed development of integrated circuit, makes chip integration more and more higher, and area is more and more less.The conventional power supply of integrated circuit is AC/DC (AC/DC) converter.The development of integrated circuit has also promoted the development of power technology, and power technology also seems more and more important to the impact of whole chip performance.
Conventionally, AC/DC converter can reduce power factor and produce power loss, wherein, power loss is mainly manifested in: the input voltage/electric current of AC/DC converter is for sinusoidal wave, after the rectification of AC/DC converter, cause in AC/DC converter, the voltage/current producing on armature winding is non-sinusoidal waveform; Or although the voltage/current producing on armature winding is sine wave, phase place is different from input voltage/electric current; Or the electric current producing on armature winding has harmonic wave.For improving power-efficient, reduce electric network pollution, conventionally adopt power factor correction (PFC) technology, reduce the power loss of AC/DC converter.
Existing PFC technology adopts the means that add capacitor filtering after bridge rectifier conventionally, reduces source power loss.Inventor finds through practice and research:
Prior art, in the situation that load changes, is difficult to obtain and the synchronous power factor correction effect of input electric energy.And, in prior art, owing to adopting the way that connects large filter capacitor after rectifier to reduce the power loss of AC/DC converter, cause AC/DC converter to take relatively large chip area, and oneself power consumption is large.
Summary of the invention
The invention provides a kind of power factor correction device, AC-DC converter and power factor correction method, solve prior art exist in the situation that load changes, the electric energy producing on armature winding is different from input electric energy same-phase, causes the larger technical problem of power loss of AC/DC converter.
In the present invention, a kind of power factor correction device, is arranged on AC/DC AC/DC converter, comprising: the first acquisition module, the second acquisition module, computing module, startup control module, sampling module and the first comparator;
Described the first acquisition module, for obtaining the description value of input electric energy, exports the description value of described input electric energy;
Described the second acquisition module, for obtaining the load feedback electric energy description value of load state on the described AC/DC converter of reflection, exports described load feedback electric energy description value;
Described computing module, access described the first acquisition module and described the second acquisition module, for utilizing description value and the described load feedback electric energy description value of the described input electric energy receiving, calculate with described input electric energy synchronously with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description;
Described startup control module, connects the input of described sampling module, controls instruction for exporting to open, and described unlatching control instruction is used for controlling described sampling module and starts working;
Described sampling module, input connects the armature winding on the transformer of described AC/DC converter, the output of described startup control module, output connects the input of described the first comparator, embodies the actual power description value of power status on described armature winding for sampling;
Described the first comparator, input accesses the output of described computing module and described sampling module, output connects the input of described sampling module, for more described actual power description value and described with reference to electric energy description value, obtaining described actual power description value with described while being worth with reference to electric energy description the comparative result equating, output stops controlling instruction; Describedly stop controlling instruction and be used to indicate described sampling module and quit work, obtain with the description of the synchronous output electric energy of described input electric energy and be worth by described armature winding; Afterwards, described startup control module is exported described unlatching control instruction, again starts described sampling module.
Preferably, described computing module comprises: description value processing module and calculator;
Described description value processing module, accesses described the second acquisition module, for according to load feedback electric energy description value, produces output valve, and in described load constant timing, described output valve is firm power energy description value; In the time that described load changes, described output valve is to embody the error electric energy description value of described variation;
Described calculator, access described description value processing module and described the first acquisition module, for utilizing the described output valve of described description value processing module output, and the description value of described input electric energy, calculate describedly with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description.
Preferably, described description value processing module comprises: the second comparator and subtracter;
Described calculator is analog multiplier;
Described the second comparator, accesses described the second acquisition module, for described load feedback electric energy description value and default first reference value are made comparisons, produces described output valve according to comparative result; If described load feedback electric energy description value equates with described first reference value, export described firm power energy description and be worth to described subtracter; Otherwise, change the embodiment to described load variations according to described load feedback electric energy description value, export the description of described error electric energy and be worth to described subtracter;
Described subtracter, accesses described the second comparator, for the described output valve receiving being deducted to default the second fiducial value, obtains subtrahend, exports described subtrahend to described analog multiplier;
Described analog multiplier, accesses described subtracter and described the first acquisition module, for according to pre-designed formula, calculates describedly with reference to electric energy description value, exports and is describedly worth to described the first comparator with reference to electric energy description;
Remember that described output valve is Vcomp; Remember that described the second fiducial value is Vref2; Remembering described is Vth1 with reference to electric energy description value, and the description value of remembering described input electric energy is Vmult, and described calculating formula is:
Vth1=K*(Vcomp-Vref2)*Vmult+B
Wherein, K is multiplier coefficients, and B is total harmonic distortion THD offset.
Preferably, described device also comprises:
Protection selector, for the protection of described device, connects the output of described computing module the input of described the first comparator by this protection selector; Comprise: compare with reference to electric energy description value and default the 3rd fiducial value described, be greater than described the 3rd fiducial value if described with reference to electric energy description value, export described the 3rd fiducial value to described the first comparator; Otherwise, export and be describedly worth to described the first comparator with reference to electric energy description.
Preferably, described startup control module is zero current detecting circuit, input connects the auxiliary winding on described transformer, output connects the input of described sampling module, for by detecting the power storage situation on described auxiliary winding, detects the electric energy release conditions of described armature winding, comprise: power on initial, detect that detection electric energy description value on described auxiliary winding is lower than default the 4th fiducial value, produce described unlatching control instruction, trigger described sampling module and start working; Or, after described sampling module quits work, described armature winding obtains described output electric energy description value and discharges the electric energy of storage, detect that detection electric energy description value on described auxiliary winding is lower than described the 4th fiducial value, produce described unlatching control instruction, trigger described sampling module and start working.
Preferably, the external sample circuit of described sampling module and controlled switch;
Described sample circuit, connects described armature winding by described controlled switch, for the described actual power description value of sampling;
Described controlled switch, one end connects described armature winding, and the other end connects described sample circuit, is subject to control key to connect the output of described startup control module and the output of described the first comparator, be used for receiving described unlatching control instruction, control described sample circuit and start working; Or, stop described in reception controlling instruction, control described employing circuit and quit work.
Preferably, described device also comprises: lead-edge-blanking circuit, NAND gate circuit, trigger and drive circuit;
Described the first comparator, is connected described sampling module by described NAND gate circuit, described trigger and described drive circuit, stops controlling instruction and be transferred to described sampling module described in inciting somebody to action; Described zero current detecting circuit, is connected described sampling module by described trigger with described drive circuit, and described unlatching control instruction is transferred to described sampling module; Comprise:
An input of described NAND gate circuit connects the output of described the first comparator, and the output of described NAND gate circuit connects an input of described trigger;
Another input of described trigger connects the output of described zero current detecting circuit, and the output of described trigger connects the input of described drive circuit, and the output of described drive circuit connects the input of described sampling module;
Described lead-edge-blanking circuit, input connects the output of described trigger, and output connects another input of described NAND gate circuit;
Described drive circuit, for the protection of described controlled switch, and transmits to open or stop control and indicates;
Described trigger, for receiving after described unlatching control instruction, triggers described lead-edge-blanking circuit working; Described in receiving, stopping controlling after instruction, stopping controlling instruction described in transmission;
Described lead-edge-blanking circuit, for after triggered by described trigger, by described NAND gate circuit, in the output of the first comparator described in default duration inner shield.
In the present invention, a kind of AC/DC converter, comprising: power factor correction device, and described device comprises: the first acquisition module, the second acquisition module, computing module, startup control module, sampling module and the first comparator;
Described the first acquisition module, for obtaining the description value of input electric energy, exports the description value of described input electric energy;
Described the second acquisition module, for obtaining the load feedback electric energy description value of load state on the described AC/DC converter of reflection, exports described load feedback electric energy description value;
Described computing module, access described the first acquisition module and described the second acquisition module, for utilizing description value and the described load feedback electric energy description value of the described input electric energy receiving, calculate with described input electric energy synchronously with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description;
Described startup control module, connects the input of described sampling module, controls instruction for exporting to open, and described unlatching control instruction is used for controlling described sampling module and starts working;
Described sampling module, input connects the armature winding on the transformer of described AC/DC converter, the output of described startup control module, output connects the input of described the first comparator, embodies the actual power description value of power status on described armature winding for sampling;
Described the first comparator, input accesses the output of described computing module and described sampling module, output connects the input of described sampling module, for more described actual power description value and described with reference to electric energy description value, obtaining described actual power description value with described while being worth with reference to electric energy description the comparative result equating, output stops controlling instruction; Describedly stop controlling instruction and be used to indicate described sampling module and quit work, obtain with the description of the synchronous output electric energy of described input electric energy and be worth by described armature winding; Afterwards, described startup control module is exported described unlatching control instruction, again starts described sampling module.
In the present invention, a kind of power factor correction method, is applied on AC/DC converter, comprising:
Step a, described AC/DC converter obtain the description value of input electric energy, obtain the load feedback electric energy description value of load state on the described AC/DC converter of reflection;
Step b, the description value of utilizing described input electric energy and described load feedback electric energy description value, calculate with described input electric energy synchronous with reference to electric energy description value;
Step c, startup sampling operation, described sampling operation comprises: the actual power description value of the armature winding power status on the transformer of the described AC/DC converter of sampling embodiment;
Steps d, more described actual power description value and described with reference to electric energy description value, to obtain comparative result be described actual power description value with described while equating with reference to electric energy description value, execution step e;
Step e, stop described sampling operation, obtain with the description of the synchronous output electric energy of described input electric energy and be worth by described armature winding; Return to execution step c.
Preferably, described step b comprises:
Step b1, process described load feedback electric energy description value, generate output valve, comprising: in described load constant timing, generating described output valve is default firm power energy description value; In the time that described load changes, generating described output valve is the error electric energy description value that embodies described variation;
Step b2, utilize described output valve, and the description value of described input electric energy, calculate described with reference to electric energy description value.
Preferably, described step b1 comprises:
Described load feedback electric energy description value and default first reference value are made comparisons, generate described output valve according to comparative result, comprising: if described load feedback electric energy description value equate with described first reference value, generate described firm power energy description value; Otherwise, change the embodiment to described load variations according to described load feedback electric energy description value, generate described error electric energy description value.
Preferably, described step b2 comprises:
Described output valve is deducted to default the second fiducial value, obtain subtrahend;
According to pre-designed formula, calculate described with reference to electric energy description value;
Remember that described output valve is Vcomp; Remember that described the second fiducial value is Vref2; Remembering described is Vth1 with reference to electric energy description value, and the description value of remembering described input electric energy is Vmult, and described calculating formula is:
Vth1=K*(Vcomp-Vref2)*Vmult+B
Wherein, K is multiplier coefficients, and B is THD offset.
Preferably, before described steps d, also comprise:
Protect described AC/DC converter, comprise: compare with reference to electric energy description value and default the 3rd fiducial value described, if be greater than described the 3rd fiducial value described with reference to electric energy description value, described steps d utilizes described the 3rd fiducial value and described actual power description value to make comparisons; Otherwise, utilize and describedly make comparisons with reference to electric energy description value and described actual power description value.
Preferably, the startup sampling operation of described step c comprises:
By detecting the stored energy situation on the auxiliary winding of described transformer, detect the energy release conditions of described armature winding, comprise: power on initial, detect that detected energy description value on described auxiliary winding, lower than default the 4th fiducial value, starts described sampling operation; Or after described sampling operation stops, described armature winding obtains described output electric energy description value and discharges the energy of storage, detects that detection electric energy description value on described auxiliary winding, lower than described the 4th fiducial value, starts described sampling operation.
Power factor correction device provided by the invention, AC-DC converter and power factor correction method, for adapting to unequally loaded running environment, determine by input electric energy and load feedback electric energy the electric energy producing on armature winding jointly.Wherein, utilize the reference electric energy producing based on inputting electric energy and load feedback electric energy, determine the electric energy on the armature winding obtaining by sampling, adapt to the application scenarios of load variations, can adjust adaptively the electric energy environment on armature winding, guarantee the electric energy and input electric energy same-phase that on armature winding, obtain, thereby, the power consumption that effectively reduces AC/DC converter, reduces electric network pollution, improves power-efficient.
Brief description of the drawings
Fig. 1 represents the structural representation of power factor correction device in the present invention;
Fig. 2 represents that in the present invention, armature winding obtains and the waveform schematic diagram of inputting the synchronous output electric energy of electric energy;
Fig. 3 represents the structural representation of computing module 103 in the present invention;
Fig. 4 represents power factor correction method flow diagram in the present invention;
Fig. 5 represents the exemplary construction schematic diagram of power factor correction device in the present invention;
Fig. 6 represents the circuit diagram of AC/DC converter in embodiments of the invention.
Embodiment
Describe specific implementation of the present invention in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, Fig. 1 is the structural representation of power factor correction device in the present invention, and this device can be arranged on AC/DC AC/DC converter.In Fig. 1, power factor correction device can comprise: the first acquisition module 101, the second acquisition module 102, computing module 103, startup control module 104, sampling module 105 and the first comparator 106;
The first acquisition module 101, for obtaining the description value of input electric energy, the description value of output input electric energy;
The second acquisition module 102, for obtaining the load feedback electric energy description value of load state on reflection AC/DC converter, output loading feedback power description value;
Computing module 103, access the first acquisition module 101 and the second acquisition module 102, for utilizing description value and the load feedback electric energy description value of the input electric energy receiving, calculating is synchronous with reference to electric energy description value with input electric energy, and output is worth to the first comparator 106 with reference to electric energy description;
Startup control module 104, the input of connection sampling module 105, controls instruction for exporting to open, and unlatching control instruction is used for controlling sampling module 105 and starts working;
Sampling module 105, the armature winding on the transformer of input connection AC/DC converter, the output of startup control module 104, output connects the input of the first comparator 106, embodies the actual power description value of power status on armature winding for sampling;
The first comparator 106, the output of input access computing module 103 and sampling module 105, output connects the input of sampling module 105, for comparison actual power description value and with reference to electric energy description value, in the time obtaining actual power description value and be worth with reference to electric energy description the comparative result equating, output stops controlling instruction; Stop controlling instruction and be used to indicate sampling module 105 and quit work, obtain with the description of the synchronous output electric energy of input electric energy and be worth by armature winding; Afterwards, start control module 104 outputs and open control instruction, again start sampling module 105.
In the present invention, obtain and input that electric energy is synchronous to be worth with reference to electric energy description by the first acquisition module 101, the second acquisition module 102 and computing module 103; The actual power description of being sampled on armature winding by sampling module 105 is worth; Controlled respectively the Push And Release of sampling module 105 by startup control module 104 and the first comparator 106, and obtaining actual power description value and be worth with reference to electric energy description equate in the situation that by the first comparator 106, controlling sampling module 105 quits work, obtain and input after the synchronous output electric energy of electric energy at armature winding, once adopt and finish, one adopts end cycle in other words, starts control module 104 and restarts sampling module 105, and the next sampling period starts.
In the application, establish electric energy description value and adopt voltage to describe.Referring to Fig. 2, Fig. 2 is that in the present invention, armature winding obtains and the waveform schematic diagram of inputting the synchronous output electric energy of electric energy.Fig. 2 oscillogram is in voltage V-time t figure, and solid line waveform is the corresponding waveform of reference voltage; Each sampled point, as an i, some j, etc., be the output voltage that armature winding obtains.In as independent PFC application, sampled point is very dense, the line of sampled point and input voltage same-phase, and similarity can reach 99.99%.Separately it should be noted that, in Fig. 2, reference voltage is the voltage after over commutation, is half-wave figure, is only the embodiment in specific implementation, in practical application, and also complete sinusoidal figure of the waveform of reference voltage.
In the application, also it should be noted that, connect and be all interpreted as function and connect shown in Fig. 1, in practical application, between two modules that exist function to connect, add the possibility of other modules, these other modules can be transmitted corresponding function, and add for prioritization scheme.
Referring to Fig. 3, Fig. 3 is the structural representation of computing module 103 in the present invention.In Fig. 3, computing module 103 can comprise: description value processing module 301 and calculator 302;
Description value processing module 301, access the second acquisition module 102, for according to load feedback electric energy description value, produces output valve, and in load constant timing, output valve is firm power energy description value; In the time that load changes, output valve is to embody the error electric energy description value of this variation;
Calculator 302, access description value processing module 301 and the first acquisition module 101, for utilizing the description value of input electric energy and the output valve that description value processing module 301 is exported, computing reference electric energy description value, output is worth to the first comparator 106 with reference to electric energy description.
In practical application, description value processing module 301 can comprise: the second comparator 301a and subtracter 301b; Calculator 302 can be specifically analog multiplier;
The second comparator 301a, access the second acquisition module 102, for load feedback electric energy description value and default first reference value are made comparisons, according to comparative result generation output valve; If load feedback electric energy description value equates with first reference value, export firm power energy description and be worth to subtracter 301b; Otherwise, changing the embodiment to load variations according to load feedback electric energy description value, the description of output error electric energy is worth to subtracter 301b;
Subtracter 301b, access the second comparator 301a, for the output valve receiving being deducted to default the second fiducial value Vref2, obtains subtrahend, and output subtrahend is to calculator 302;
Calculator 302, access subtracter 301b and the first acquisition module 101, for according to pre-designed formula, calculate with reference to electric energy description value, and output is worth to the first comparator 106 with reference to electric energy description;
Note output valve is Vcomp; Remember that the second fiducial value is Vref2; Note is Vth1 with reference to electric energy description value, and the description value of note input electric energy is that input voltage is Vmult, and calculating formula is:
Vth1=K*(Vcomp-Vref2)*Vmult+B????????????(1)
Wherein, K is multiplier coefficients, and B is total harmonic distortion (THD) offset.
In concrete application, above-mentioned power factor correction device also can comprise:
Protection selector, for the protection of this device, connects the output of computing module 103 input of the first comparator 106 by this protection selector; Comprise: compare with default the 3rd fiducial value Vref3 with reference to electric energy description value, if be greater than the 3rd fiducial value with reference to electric energy description value, output the 3rd fiducial value is given the first comparator 106; Otherwise output is worth to the first comparator 106 with reference to electric energy description.
In concrete application, starting control module 104 can be zero current detecting circuit, its input connects auxiliary winding, output connects the input of sampling module 105, for the power storage situation on the auxiliary winding by detecting transformer, detect the electric energy release conditions of secondary winding, thereby know the power storage situation on armature winding; Comprise: power on initial, detect that the detection electric energy description value of assisting on Motor Winding Same Name of Ends is lower than default the 4th fiducial value, produce to open and control instruction, triggering sampling module 105 is started working; Or after sampling module 105 quits work, armature winding obtains output electric energy description value and discharges the energy of storage, wherein, output electric energy description value is also armature winding obtainable maximum power description value on sampled point, the maximum storage of corresponding electric energy; Do not have electric current to flow through when detecting on auxiliary group of winding, the Same Name of Ends voltage of auxiliary group of winding is lower than the 4th fiducial value, and the energy on secondary winding is all transferred to load, so, produce to open and control instruction, trigger sampling module 105 and start working.Wherein, the 4th fiducial value is very little.
Sampling module 105 is realized sampling by external sample circuit and controlled switch, wherein,
Sample circuit, connects armature winding by controlled switch, for the actual power description value of sampling;
Controlled switch, one end connects armature winding, and the other end connects sample circuit, connected by control key and starts the output of control module 104 and the output of the first comparator 106, controls instruction for receiving to open, and controls sample circuit and starts working; Or, receive and stop controlling instruction, control and adopt circuit to quit work.
Referring to Fig. 4, Fig. 4 is power factor correction method flow diagram in the present invention, and the method can be applicable to, on AC/DC converter, comprise the following steps:
Step 401, AC/DC converter obtain the description value of input electric energy, obtain the load feedback electric energy description value of load state on reflection AC/DC converter.
Description value and the load feedback electric energy description value of step 402, utilization input electric energy, calculate with input electric energy synchronous with reference to electric energy description value.
This step 402 specifically can comprise:
Step 402a, processing load feedback electric energy description value, generate output valve, comprising: in load constant timing, generating output valve is default firm power energy description value; In the time that load changes, generating output valve is the error electric energy description value that embodies load variations, is specially:
This makes comparisons described load feedback electric energy description value and default first reference value, generates described output valve according to comparative result, comprising: if described load feedback electric energy description value equate with described first reference value, generate described firm power energy description value; Otherwise, change the embodiment to described load variations according to described load feedback electric energy description value, generate described error electric energy description value.
Step 402b, utilize output valve, and the description value of input electric energy, computing reference electric energy description value.
Step 403, startup sampling operation, this sampling operation comprises: the actual power description value of the armature winding power status on the transformer of sampling embodiment AC/DC converter.
The specific implementation of this step 403 can comprise:
By the power storage situation on the auxiliary winding of detection transformer, the electric energy release conditions of detection of primary winding, comprising: power on initial, detect that the detection electric energy description value of assisting on winding, lower than default the 4th fiducial value, starts sampling operation; Or after sampling operation stops, armature winding obtains output electric energy description value and discharges the electric energy of storage, detects that the detection electric energy description value of assisting on winding, lower than the 4th fiducial value, starts sampling operation.
In practical application, can adopt other ways way as conventional in some, start sampling operation.
Step 404, relatively actual power description value with reference to electric energy description value, to obtain comparative result be actual power description value when equating with reference to electric energy description value, perform step 405.
Step 405, stop sampling operation, obtain with the description of the synchronous output electric energy of input electric energy and be worth by armature winding; Return to execution step 403.
In practical application, be protective circuit, operation below also can carrying out before carrying out above-mentioned steps 404:
Compare with reference to electric energy description value and default the 3rd fiducial value, if be greater than the 3rd fiducial value with reference to electric energy description value, step 404 utilizes the 3rd fiducial value and actual power description value to make comparisons; Otherwise, utilize and make comparisons with reference to electric energy description value and actual power description value.
Taking electric energy description value as magnitude of voltage is as example, specific implementation of the present invention is described below.
Referring to Fig. 5, Fig. 5 is the exemplary construction schematic diagram of power factor correction device in the present invention.In Fig. 5, the external sample circuit of sampling module 105 can comprise a resistance R 1, and controlled switch can be a metal oxide semiconductor field-effect (MOS) switching tube M0.Pressure drop Vcs in resistance R 1 embodies the actual power situation on armature winding.Wherein one end contact resistance R1 of switching tube M0, the other end connects the armature winding (not shown in Fig. 5) on AC/DC converter, is subject to control key to connect drive circuit.In practical application, the concrete form of sampling module 105 can be various, and the application does not enumerate.
In Fig. 5, drive circuit arranges for auxiliary, mainly for the protection of switching tube M0, can transmit the control instruction that startup control module 104 or the first comparator 106 are exported.
In Fig. 5, the first acquisition module 101 specifically comprises two series resistances: resistance R 2 and resistance R 3, and input electric energy description value Vmult is:
Vmult = Vin × R 2 R 1 + R 2 - - - ( 2 )
Wherein, Vin is that AC/DC converter carries out to input source voltage wherein the input voltage obtaining after rectification, with source voltage same-phase.
The load feedback electric energy description value that the second acquisition module 102 obtains is specially load condition feedback voltage, is designated as Vfb.The second comparator 301a is specially error comparator COMP21.Load condition feedback voltage Vfb is compared and is obtained output valve Vcomp by error comparator COMP21 and the first reference voltage V ref1.
If in certain several continuous operation cycle of sampling module 105 start and stop work, load changes, in the present embodiment, according to the design feature of load feedback circuit on AC/DC converter, if load condition feedback voltage Vfb reduces, embody load and reduce, voltage Vfb increases, and embodies load and increases; , when voltage Vfb is greater than voltage Vref1, voltage Vcomp is set and declines; When voltage Vfb is less than voltage Vref1, voltage Vcomp is set and rises.In practical application, if on AC/DC converter in the design of load feedback circuit, if voltage Vfb reduces, embody load and increase, voltage Vfb increases, and embodies load and reduces; Can relative set be less than voltage Vref1 as voltage Vfb, voltage Vcomp rises; When voltage Vfb is greater than voltage Vref1, voltage Vcomp declines, and is not limited to the situation that the present embodiment is enumerated.And, can be according to actual interlock circuit setting for the relational expression that embodies voltage Vcomp and voltage Vfb.
In the present invention, when in the situation that load changes, the voltage Vcomp of error comparator COMP21 output is also different, thereby can make the electric current in primary inductance make adjustment adaptively, makes AC/DC converter have good load regulation.
In practical application, in Fig. 5, the effect of subtracter 301b is mainly reflected on arithmetic mean, the Vcomp with bigger numerical is diminished, so that subsequent calculations.In Fig. 5, analog multiplier utilizes above-mentioned calculating formula (1) computing reference electric energy description value, or claims reference voltage Vth1, this reference voltage Vth1 and input voltage same-phase, and its oscillogram is sinusoidal waveform figure.In above-mentioned calculating formula (1), multiplier coefficients K value determines by system applies occasion the scope that arranges, and the internal circuit that can be used for realizing the light-emitting diode (LED driver) of PFC apparatus for correcting by amendment is revised K value; B value is for the bucking voltage of oscillogram zero crossing is provided, with harmonic reduction distortion.
Device as shown in Figure 5, in practical application, above-mentioned protection selector is specially an alternative selector, in two input, the reference voltage Vth1 of input access analog multiplier output, another input is the 3rd fiducial value Vref3 presetting.Comparison reference voltage Vth1 and voltage Vref3, export wherein less one to the first comparator 106, too high in order to prevent reference voltage Vth1, damage circuit.The voltage of remembering this alternative selector output is Vth.
In Fig. 5, the first comparator 106 is crest voltage comparator C OMP22, and for the voltage Vcs in the resistance R 1 of sample circuit relatively and the voltage Vth of alternative selector output, and in the time that voltage Vcs reaches voltage Vth, output stops controlling instruction.Visible, voltage Vref3 is the accessible maximum voltage of voltage Vcs in practical application.
In concrete application, Fig. 5 shown device also can comprise: lead-edge-blanking (LEB) circuit, NAND gate circuit, rest-set flip-flop and above-mentioned drive circuit;
The first comparator 106, is connected sampling module 105 by NAND gate circuit, rest-set flip-flop and drive circuit, will stop controlling instruction and be transferred to sampling module 105; Zero current detecting circuit, is connected sampling module 105 with drive circuit by rest-set flip-flop, unlatching is controlled to instruction and be transferred to sampling module 105.
Wherein, NAND gate circuit is two defeated NAND gate, and an one input connects the output of the first comparator 106, and another input connects the output of lead-edge-blanking circuit; Its output connects an input of rest-set flip-flop.Another input of rest-set flip-flop connects the output of zero current detecting circuit, and output connects the input of drive circuit.The output of drive circuit connects the input of sampling module 105, switching tube M0 be subject to control key.
Rest-set flip-flop, for after receiving that opening control indicates, triggers lead-edge-blanking circuit working; After receiving that stopping control indicating, transmit and stop controlling instruction.
LEB circuit, input connects the output of rest-set flip-flop, and output connects another input of NAND gate circuit, for after triggered by rest-set flip-flop, by NAND gate circuit, in the output of default duration inner shield the first comparator 106.
In practical application, switching tube M0 is opening moment meeting burr electric current formation burr voltage conventionally, and this burr magnitude of voltage is conventionally higher, may exceed the voltage Vth of alternative selector output at that time.Be voltage Vcs for avoiding crest voltage comparator C OMP22 by burr voltage flase drop, cause switching tube M0 just to open, just be closed, can utilize above-mentioned LEB circuit, export to open at zero current detecting circuit at every turn and control instruction while opening switching tube M0, by the shielded signal of one section of default duration of LEB circuit output, by two defeated NAND gate, shield the now output of crest voltage comparator C OMP22, after one section of default duration, by the time circuit is stable, and LEB circuit quits work, and the output of crest voltage comparator C OMP22 is effective.And in embodiments of the invention, zero current detecting circuit makes AC/DC converter be operated in critical continuous conduction mode, in middle low power application scenarios, can make full use of electric energy, reduces to greatest extent electric network pollution, reduce power consumption, raising efficiency.
Above-mentioned rest-set flip-flop is logic switching circuit, is mainly used in integrating the logic function of crest voltage comparator C OMP22, LEB circuit and zero current detecting circuit, transmits to open and controls instruction and stop controlling instruction, to realize the open and close to switching tube M0.
Drive circuit is in practical application, and the logical circuit that provides enough driving forces to arrange for switching tube M0, to avoid switching tube M0 be subject to too large impact and damage in the moment that is unlocked.
In embodiments of the invention, LED driver can adopt floppy drive type of drive, effectively to avoid electromagnetic interference.
Concrete applicating example shown in Fig. 5 as, zero current detecting circuit input ZCD detects that when voltage Vzcd is voltage Vref4 lower than the 4th fiducial value on auxiliary winding, the sampling period starts: zero current detecting circuit output is opened to control and is designated as 1 end of the R to rest-set flip-flop.Rest-set flip-flop transmission is opened and is controlled instruction, output high level 1; LEB circuit is triggered after receiving the high level of rest-set flip-flop output, the defeated NAND gate of low level 0 to two of one section of duration of output; What the two defeated NAND gate no matter output of crest voltage comparator C OMP22 are, all shield the output of crest voltage comparator C OMP22; Drive circuit is received after the high level 1 of rest-set flip-flop output, opening switch pipe M0, and sample circuit is started working, and a sampling period starts.In the time that LEB circuit output switching activity is 1, function of shielding disappears, the output of two defeated NAND gate transmission peak threshold voltage comparator C OMP22; Equate with voltage Vth when crest voltage comparator C OMP22 detects voltage Vcs, output stops controlling instruction high level 1, and now LEB circuit output is also the defeated NAND gate output low level 0 of high level 1, two; Rest-set flip-flop transmits the output of two defeated NAND gate; Drive circuit is received after low level, closing switch pipe M0, and a sampling period finishes.Cited concrete application is only a specific embodiment of the present invention, in practical application, and the meaning that reconfigurable logical value is represented, the application does not enumerate.
By power factor correction application of installation provided by the invention and flyback topology AC/DC converter, concrete application of the present invention is described below, but person of ordinary skill in the field will recognize, the present invention also can be applicable to the AC/DC switch power supply system of other type.
Referring to Fig. 6, Fig. 6 is the circuit diagram of AC/DC converter in embodiments of the invention.Shown in Fig. 6, in circuit, bridge rectifier 601 and capacitor C 0 are for carrying out rectification to the AC power of input AC/DC converter, the voltage Vin of output after rectification; Voltage Vin charges to capacitor C 1 through starting resistance R4, and in the time that the voltage in capacitor C 1 is closed voltage (UVLO_OFF) higher than chip voltage under-voltage locking, LED driver 602 starts; LED driver 602 is the power factor correction device in the present invention, outside connected switch pipe M0 and resistance R 1, the voltage Vcs on pin CS sampling resistor R1; Resistance R 2 and resistance R 3 are that LED driver 602 is external for obtaining the resistance of input voltage Vmult; Resistance R 4 is initially LED driver 602 with capacitor C 1 and powers for powering on; Resistance-capacitance-diode (RCD) clamp circuit 603, for the crest voltage at transformer 604 armature winding Z1 two ends is carried out to clamper, absorbs peak current, protective circuit; Resistance R 5 connects the input ZCD of auxiliary winding Z2 and zero current detecting circuit, for obtaining the voltage Vzcd assisting on winding, and the corresponding power storage situation of knowing on secondary winding Z3, and electric energy release conditions on armature winding Z1; Auxiliary winding Z2 provides energy VDD through rectifier diode D1 to LED driver 602; Secondary winding Z3 and diode D2 change the alternating current on armature winding Z1 into direct current, and can be stored in capacitor C 2; Circuit 605 is included as LED driver 602 provides load feedback circuit and the protective circuit of load feedback voltage Vfb, wherein load feedback circuit comprises: when the positive and negative level of LED two ends connect load, there is electric current to pass through, current flowing in resistance R 6, by the reference voltage of voltage stack producing in resistance R 6, this reference voltage is formed by resistance R 7 and R8 dividing potential drop, will compare through voltage and the error comparator D3 of stack, reaching after preset value conducting optical coupling amplifier 606; Electric current after optical coupling amplifier 606 the amplifies resistance R 9 of flowing through, and after resistance R 10 dividing potential drops, form FB functional pin terminal voltage, i.e. load feedback voltage Vfb; Pin COMP voltage is Vcomp; In foregoing circuit 605, except above-mentioned load feedback circuit, all can be regarded as protective circuit, is common technology, and the application does not repeat.In addition, pin GND is the earth terminal of LED driver 602; Pin GD is for controlling indication output end, for control switch pipe M0.
In Fig. 6, power on initial, switching tube M0 closes, and zero current detecting circuit detects that the voltage Vzcd in resistance R 5 is less, and send to open and control instruction, trigger switch pipe M0 conducting, the sampling period starts; In switching tube M0 conduction period, the electric current that flows through transformer 603 primary inductances flows through resistance R 1 with the controlled rate of rise, and LED driver 602 detects the pressure drop Vcs producing in resistance R 1, and in the time that voltage Vcs reaches Vth, control switch pipe M0 turn-offs; After switching tube M0 turn-offs, the clamped circuit 603 of RCD carries out clamped to the crest voltage at transformer 604 armature winding two ends, transformer 604 secondary winding externally provide energy through output rectifier diode D2, and the auxiliary winding of transformer 604 provides energy through rectifier diode D1 to the supply power voltage VDD of LED driver 602 simultaneously; When zero current detecting circuit detects that ohmically voltage Vzcd hour, again sends to open and controls instruction again, trigger switch pipe M0 conducting, the new sampling period starts.
In sum, in technical scheme provided by the invention, consider that load state, on the impact of correcting, determines by input electric energy and load feedback electric energy the electric energy producing on armature winding jointly.Wherein, utilize the reference electric energy producing based on inputting electric energy and load feedback electric energy, determine the electric energy on the armature winding obtaining by sampling, adapt to the application scenarios of load variations, can adjust adaptively the electric energy environment on armature winding, guarantee the electric energy and input electric energy same-phase that on armature winding, obtain, thereby, the power consumption that effectively reduces AC/DC converter, reduces electric network pollution, improves power-efficient.
And in the present invention, by the energy on current sensor detection at zero point secondary winding, make system works at critical conduction mode, in middle low power application scenarios, can effectively reduce electric network pollution, reduce to greatest extent power consumption, raising efficiency.
In addition, the realization of technical solution of the present invention can effectively reduce the shared chip area of LED driver.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (9)

1. a power factor correction device, is characterized in that, is arranged on AC/DC AC/DC converter, comprising: the first acquisition module, the second acquisition module, computing module, startup control module, sampling module and the first comparator;
Described the first acquisition module, for obtaining the description value of input electric energy, exports the description value of described input electric energy;
Described the second acquisition module, for obtaining the load feedback electric energy description value of load state on the described AC/DC converter of reflection, exports described load feedback electric energy description value;
Described computing module, access described the first acquisition module and described the second acquisition module, for utilizing description value and the described load feedback electric energy description value of the described input electric energy receiving, calculate with described input electric energy synchronously with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description;
Described startup control module, connects the input of described sampling module, controls instruction for exporting to open, and described unlatching control instruction is used for controlling described sampling module and starts working;
Described sampling module, input connects the armature winding on the transformer of described AC/DC converter, the output of described startup control module, output connects the input of described the first comparator, embodies the actual power description value of power status on described armature winding for sampling;
Described the first comparator, input accesses the output of described computing module and described sampling module, output connects the input of described sampling module, for more described actual power description value and described with reference to electric energy description value, obtaining described actual power description value with described while being worth with reference to electric energy description the comparative result equating, output stops controlling instruction; Describedly stop controlling instruction and be used to indicate described sampling module and quit work, obtain with the description of the synchronous output electric energy of described input electric energy and be worth by described armature winding; Afterwards, described startup control module is exported described unlatching control instruction, again starts described sampling module;
Described computing module comprises: description value processing module and calculator;
Described description value processing module, accesses described the second acquisition module, for according to load feedback electric energy description value, produces output valve, and in described load constant timing, described output valve is firm power energy description value; In the time that described load changes, described output valve is to embody the error electric energy description value of described variation;
Described calculator, access described description value processing module and described the first acquisition module, for utilizing the described output valve of described description value processing module output, and the description value of described input electric energy, calculate describedly with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description;
Described description value processing module comprises: the second comparator and subtracter;
Described calculator is analog multiplier;
Described the second comparator, accesses described the second acquisition module, for described load feedback electric energy description value and default first reference value are made comparisons, produces described output valve according to comparative result; If described load feedback electric energy description value equates with described first reference value, export described firm power energy description and be worth to described subtracter; Otherwise, change the embodiment to described load variations according to described load feedback electric energy description value, export the description of described error electric energy and be worth to described subtracter;
Described subtracter, accesses described the second comparator, for the described output valve receiving being deducted to default the second fiducial value, obtains subtrahend, exports described subtrahend to described analog multiplier;
Described analog multiplier, accesses described subtracter and described the first acquisition module, for according to pre-designed formula, calculates describedly with reference to electric energy description value, exports and is describedly worth to described the first comparator with reference to electric energy description;
Remember that described output valve is Vcomp; Remember that described the second fiducial value is Vref2; Remembering described is Vth1 with reference to electric energy description value, and the description value of remembering described input electric energy is Vmult, and described calculating formula is:
Vth1=K*(Vcomp-Vref2)*Vmult+B
Wherein, K is multiplier coefficients, and B is total harmonic distortion THD offset.
2. device as claimed in claim 1, is characterized in that, described device also comprises:
Protection selector, for the protection of described device, connects the output of described computing module the input of described the first comparator by this protection selector; Comprise: compare with reference to electric energy description value and default the 3rd fiducial value described, be greater than described the 3rd fiducial value if described with reference to electric energy description value, export described the 3rd fiducial value to described the first comparator; Otherwise, export and be describedly worth to described the first comparator with reference to electric energy description.
3. the device as described in claim 1 to 2 any one, is characterized in that,
Described startup control module is zero current detecting circuit, input connects the auxiliary winding on described transformer, output connects the input of described sampling module, for passing through to detect the power storage situation on described auxiliary winding, the electric energy release conditions that detects described armature winding, comprising: power on initial, detect that detection electric energy description value on described auxiliary winding is lower than default the 4th fiducial value, produce described unlatching control instruction, trigger described sampling module and start working; Or, after described sampling module quits work, described armature winding obtains described output electric energy description value and discharges the electric energy of storage, detect that detection electric energy description value on described auxiliary winding is lower than described the 4th fiducial value, produce described unlatching control instruction, trigger described sampling module and start working.
4. device as claimed in claim 3, is characterized in that, the external sample circuit of described sampling module and controlled switch;
Described sample circuit, connects described armature winding by described controlled switch, for the described actual power description value of sampling;
Described controlled switch, one end connects described armature winding, and the other end connects described sample circuit, is subject to control key to connect the output of described startup control module and the output of described the first comparator, be used for receiving described unlatching control instruction, control described sample circuit and start working; Or, stop described in reception controlling instruction, control described sample circuit and quit work.
5. device as claimed in claim 4, is characterized in that, described device also comprises: lead-edge-blanking circuit, NAND gate circuit, trigger and drive circuit;
Described the first comparator, is connected described sampling module by described NAND gate circuit, described trigger and described drive circuit, stops controlling instruction and be transferred to described sampling module described in inciting somebody to action; Described zero current detecting circuit, is connected described sampling module by described trigger with described drive circuit, and described unlatching control instruction is transferred to described sampling module; Comprise:
An input of described NAND gate circuit connects the output of described the first comparator, and the output of described NAND gate circuit connects an input of described trigger;
Another input of described trigger connects the output of described zero current detecting circuit, and the output of described trigger connects the input of described drive circuit, and the output of described drive circuit connects the input of described sampling module;
Described lead-edge-blanking circuit, input connects the output of described trigger, and output connects another input of described NAND gate circuit;
Described drive circuit, for the protection of described controlled switch, and transmits and opens or closing control instruction;
Described trigger, for receiving after described unlatching control instruction, triggers described lead-edge-blanking circuit working; Described in receiving, stopping controlling after instruction, stopping controlling instruction described in transmission;
Described lead-edge-blanking circuit, for after triggered by described trigger, by described NAND gate circuit, in the output of the first comparator described in default duration inner shield.
6. an AC/DC converter, is characterized in that, comprising: power factor correction device, and described device comprises: the first acquisition module, the second acquisition module, computing module, startup control module, sampling module and the first comparator;
Described the first acquisition module, for obtaining the description value of input electric energy, exports the description value of described input electric energy;
Described the second acquisition module, for obtaining the load feedback electric energy description value of load state on the described AC/DC converter of reflection, exports described load feedback electric energy description value;
Described computing module, access described the first acquisition module and described the second acquisition module, for utilizing description value and the described load feedback electric energy description value of the described input electric energy receiving, calculate with described input electric energy synchronously with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description;
Described startup control module, connects the input of described sampling module, controls instruction for exporting to open, and described unlatching control instruction is used for controlling described sampling module and starts working;
Described sampling module, input connects the armature winding on the transformer of described AC/DC converter, the output of described startup control module, output connects the input of described the first comparator, embodies the actual power description value of power status on described armature winding for sampling;
Described the first comparator, input accesses the output of described computing module and described sampling module, output connects the input of described sampling module, for more described actual power description value and described with reference to electric energy description value, obtaining described actual power description value with described while being worth with reference to electric energy description the comparative result equating, output stops controlling instruction; Describedly stop controlling instruction and be used to indicate described sampling module and quit work, obtain with the description of the synchronous output electric energy of described input electric energy and be worth by described armature winding; Afterwards, described startup control module is exported described unlatching control instruction, again starts described sampling module;
Described computing module comprises: description value processing module and calculator;
Described description value processing module, accesses described the second acquisition module, for according to load feedback electric energy description value, produces output valve, and in described load constant timing, described output valve is firm power energy description value; In the time that described load changes, described output valve is to embody the error electric energy description value of described variation;
Described calculator, access described description value processing module and described the first acquisition module, for utilizing the described output valve of described description value processing module output, and the description value of described input electric energy, calculate describedly with reference to electric energy description value, export and be describedly worth to described the first comparator with reference to electric energy description;
Described description value processing module comprises: the second comparator and subtracter;
Described calculator is analog multiplier;
Described the second comparator, accesses described the second acquisition module, for described load feedback electric energy description value and default first reference value are made comparisons, produces described output valve according to comparative result; If described load feedback electric energy description value equates with described first reference value, export described firm power energy description and be worth to described subtracter; Otherwise, change the embodiment to described load variations according to described load feedback electric energy description value, export the description of described error electric energy and be worth to described subtracter;
Described subtracter, accesses described the second comparator, for the described output valve receiving being deducted to default the second fiducial value, obtains subtrahend, exports described subtrahend to described analog multiplier;
Described analog multiplier, accesses described subtracter and described the first acquisition module, for according to pre-designed formula, calculates describedly with reference to electric energy description value, exports and is describedly worth to described the first comparator with reference to electric energy description;
Remember that described output valve is Vcomp; Remember that described the second fiducial value is Vref2; Remembering described is Vth1 with reference to electric energy description value, and the description value of remembering described input electric energy is Vmult, and described calculating formula is:
Vth1=K*(Vcomp-Vref2)*Vmult+B
Wherein, K is multiplier coefficients, and B is total harmonic distortion THD offset.
7. a power factor correction method, is characterized in that, is applied on AC/DC converter, comprising:
Step a, described AC/DC converter obtain the description value of input electric energy, obtain the load feedback electric energy description value of load state on the described AC/DC converter of reflection;
Step b, the description value of utilizing described input electric energy and described load feedback electric energy description value, calculate with described input electric energy synchronous with reference to electric energy description value;
Step c, startup sampling operation, described sampling operation comprises: the actual power description value of the armature winding power status on the transformer of the described AC/DC converter of sampling embodiment;
Steps d, more described actual power description value and described with reference to electric energy description value, to obtain comparative result be described actual power description value with described while equating with reference to electric energy description value, execution step e;
Step e, stop described sampling operation, obtain with the description of the synchronous output electric energy of described input electric energy and be worth by described armature winding; Return to execution step c;
Described step b comprises:
Step b1, process described load feedback electric energy description value, generate output valve, comprising: in described load constant timing, generating described output valve is default firm power energy description value; In the time that described load changes, generating described output valve is the error electric energy description value that embodies described variation;
Step b2, utilize described output valve, and the description value of described input electric energy, calculate described with reference to electric energy description value;
Described step b1 comprises:
Described load feedback electric energy description value and default first reference value are made comparisons, generate described output valve according to comparative result, comprising: if described load feedback electric energy description value equate with described first reference value, generate described firm power energy description value; Otherwise, change the embodiment to described load variations according to described load feedback electric energy description value, generate described error electric energy description value;
Described step b2 comprises:
Described output valve is deducted to default the second fiducial value, obtain subtrahend;
According to pre-designed formula, calculate described with reference to electric energy description value;
Remember that described output valve is Vcomp; Remember that described the second fiducial value is Vref2; Remembering described is Vth1 with reference to electric energy description value, and the description value of remembering described input electric energy is Vmult, and described calculating formula is:
Vth1=K*(Vcomp-Vref2)*Vmult+B
Wherein, K is multiplier coefficients, and B is THD offset.
8. method as claimed in claim 7, is characterized in that, before described steps d, also comprises:
Protect described AC/DC converter, comprise: compare with reference to electric energy description value and default the 3rd fiducial value described, if be greater than described the 3rd fiducial value described with reference to electric energy description value, described steps d utilizes described the 3rd fiducial value and described actual power description value to make comparisons; Otherwise, utilize and describedly make comparisons with reference to electric energy description value and described actual power description value.
9. method as claimed in claim 7 or 8, is characterized in that, the startup sampling operation of described step c comprises:
By detecting the stored energy situation on the auxiliary winding of described transformer, detect the energy release conditions of described armature winding, comprise: power on initial, detect that detected energy description value on described auxiliary winding, lower than default the 4th fiducial value, starts described sampling operation; Or after described sampling operation stops, described armature winding obtains described output electric energy description value and discharges the energy of storage, detects that detection electric energy description value on described auxiliary winding, lower than described the 4th fiducial value, starts described sampling operation.
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CN101860194A (en) * 2010-05-14 2010-10-13 北方工业大学 Implementation method and device of multi-mode power factor corrector
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