CN105811791B - PFC pfc circuit and its inductance discrimination method and device - Google Patents
PFC pfc circuit and its inductance discrimination method and device Download PDFInfo
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- CN105811791B CN105811791B CN201610373963.5A CN201610373963A CN105811791B CN 105811791 B CN105811791 B CN 105811791B CN 201610373963 A CN201610373963 A CN 201610373963A CN 105811791 B CN105811791 B CN 105811791B
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- switch tube
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a kind of PFC pfc circuit and its inductance discrimination methods and device, the described method comprises the following steps：Test voltage is injected to inductance, and controls power switch tube and is operated in constant conduction state or pulsewidth modulation state；The input voltage of pfc circuit is detected, and detects the input current of pfc circuit, and detects the output voltage of pfc circuit；The voltage at inductance both ends is calculated according to input voltage and output voltage；And inductance is recognized according to the Flux consumption of voltage and the variable quantity of input current at inductance both ends to obtain the inductance value of inductance.This method is by injecting test voltage, and power switch tube is made to be operated in constant conduction state or pulsewidth modulation state, then, the inductance value of inductance is calculated according to the variable quantity of the Flux consumption of test voltage effect and input current, to judge whether the inductance is damaged according to inductance value.
Description
Technical field
The present invention relates to power factor correction technology field, more particularly to a kind of PFC (Power Factor
Correction, PFC) circuit and its inductance discrimination method and device.
Background technology
Most household electrical appliance use following circuit topology：Direct current of the single phase alternating current power supply Jing Guo uncontrollable rectification output ripple
Voltage adjusts output steady dc voltage using power factor corrector, is then connected to the electrolytic capacitor of large capacity, finally
Internal switch power supply and basic load is given to power again.Wherein, power factor corrector often uses Boost type pfc circuit, i.e., by electricity
Sense, power switch tube and diode composition.
During household electrical appliance production and transport, the inductance of pfc circuit easy tos produce magnetic core fracture or fragmentation so that electricity
The sensibility reciprocal of sense seriously becomes smaller, to cause power factor emendation function abnormal.If household electrical appliance long-term work is in power factor
In the state of calibration function exception, then the service life of household electrical appliance will be influenced, and local power net can be polluted, even result in house
Electrical appliance can not work normally.
For this purpose, being highly desirable to carry out the inductance self-test of product before product export, prevent defective product from coming into the market.Together
When, the sensibility reciprocal of inductance has positive effect to optimization PFC control parameters.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
First purpose is to propose that a kind of inductance discrimination method of pfc circuit, this method make power open by injecting test voltage
It closes pipe and is operated in constant conduction state or pulsewidth modulation state, then, according to the Flux consumption of test voltage effect and input electricity
The variable quantity of stream calculates the inductance value of inductance, to judge whether the inductance is damaged according to inductance value.
Second object of the present invention is to propose a kind of inductance device for identifying of pfc circuit.
Third object of the present invention is to propose a kind of pfc circuit.
To achieve the above object, first aspect present invention embodiment proposes a kind of inductance discrimination method of pfc circuit, institute
It includes inductance, power switch tube and diode to state pfc circuit, be the described method comprises the following steps：It injects and tests to the inductance
Voltage, and control the power switch tube and be operated in constant conduction state or pulsewidth modulation state；Detect the pfc circuit
Input voltage, and the input current of the pfc circuit is detected, and detect the output voltage of the pfc circuit；According to described defeated
Enter voltage and the output voltage calculates the voltage at the inductance both ends；And the Flux consumption of the voltage according to the inductance both ends
The inductance is recognized with the variable quantity of the input current to obtain the inductance value of the inductance.
The inductance discrimination method of pfc circuit according to the ... of the embodiment of the present invention by injecting test voltage to inductance, and controls
Power switch tube is operated in constant conduction state or pulsewidth modulation state, then by detecting inductive current, and according to test
The Flux consumption of voltage effect and the variable quantity of inductive current calculate the inductance value of inductance, to judge the inductance according to inductance value
Whether it is damaged, is replaced in time if damage, to effectively avoids the pfc circuit power factor school caused by inductance damages
The problem of orthofunction exception, and then ensure that the Related product with pfc circuit can work normally, ensure the reliability of product,
Improve user experience.
According to one embodiment of present invention, it is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VindFor the voltage at the inductance both ends, t1And t2The respectively described test
Voltage is carved at the beginning of injecting and finish time, Iind(t1) and Iind(t2) it is respectively the test voltage injection start time
The input current of input current and test voltage injection finish time.
According to one embodiment of present invention, it is calculated by the following formula the voltage at the inductance both ends：
Wherein, VindFor the voltage at the inductance both ends, VbdFor the input voltage, VIGBTFor the power switch tube
Conduction voltage drop, VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage.
According to one embodiment of present invention, when injecting test voltage to the inductance, and the power switch tube is controlled
When being operated in constant conduction state, it is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conducting of the power switch tube
Pressure drop, TPWMFor the work period of the power switch tube, Iind(0) and Iind(N) when being respectively that test voltage injection starts
The input current of the input current at quarter and test voltage injection finish time.
According to one embodiment of present invention, it when injecting the test voltage to the inductance, and controls the power and opens
When pass pipe is operated in pulsewidth modulation state, it is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conducting of the power switch tube
Pressure drop, VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage, TPWMFor the work week of the power switch tube
Phase, D are the conducting dutycycle of the power switch tube, Iind(0) and Iind(N) it is respectively the test voltage injection start time
Input current and the test voltage injection finish time input current.
According to one embodiment of present invention, the conducting dutycycle of the power switch tube meets following formula：
Wherein, D is the conducting dutycycle of the power switch tube, VbdFor the input voltage, VdcFor output electricity
Pressure, L0For the inductance value under the inductance normal condition, IthFor the maximum current value that the power switch tube allows, TPWMFor institute
State the work period of power switch tube.
To achieve the above object, second aspect of the present invention embodiment proposes a kind of electricity of PFC pfc circuit
Feel device for identifying, the pfc circuit includes inductance, power switch tube and diode, and described device includes：Injection module, it is described
Injection module is used to inject test voltage to the inductance；Voltage detection module, the voltage detection module are described for detecting
The output voltage of the input voltage of pfc circuit and the pfc circuit；Current detection module, the current detection module is for examining
Survey the input current of the pfc circuit；Recognize module, the identification module respectively with the injection module, the voltage detecting
Module is connected with the current detection module, and the identification module is operated in constant conduction shape for controlling the power switch tube
State or pulsewidth modulation state, and the voltage at the inductance both ends is calculated according to the input voltage and the output voltage, with
And the inductance is recognized to obtain according to the Flux consumption of voltage and the variable quantity of the input current at the inductance both ends
Take the inductance value of the inductance.
The inductance device for identifying of pfc circuit according to the ... of the embodiment of the present invention by injecting test voltage to inductance, and controls
Power switch tube is operated in constant conduction state or pulsewidth modulation state, then by detecting inductive current, and according to test
The Flux consumption of voltage effect and the variable quantity of inductive current calculate the inductance value of inductance, to judge the inductance according to inductance value
Whether it is damaged, is replaced in time if damage, to effectively avoids the pfc circuit power factor school caused by inductance damages
The problem of orthofunction exception, and then ensure that the Related product with pfc circuit can work normally, ensure the reliability of product,
Improve user experience.
According to one embodiment of present invention, the identification module is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VindFor the voltage at the inductance both ends, t1And t2The respectively described test
Voltage is carved at the beginning of injecting and finish time, Iind(t1) and Iind(t2) it is respectively the test voltage injection start time
The input current of input current and test voltage injection finish time.
According to one embodiment of present invention, the identification module is calculated by the following formula the electricity at the inductance both ends
Pressure：
Wherein, VindFor the voltage at the inductance both ends, VbdFor the input voltage, VIGBTFor the power switch tube
Conduction voltage drop, VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage.
According to one embodiment of present invention, it when the injection module injects test voltage to the inductance, and described distinguishes
When the knowledge module control power switch tube is operated in constant conduction state, the identification module is obtained by the following formula described
The inductance value of inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conducting of the power switch tube
Pressure drop, TPWMFor the work period of the power switch tube, Iind(0) and Iind(N) when being respectively that test voltage injection starts
The input current of the input current at quarter and test voltage injection finish time.
According to one embodiment of present invention, when the injection module injects the test voltage, and institute to the inductance
When stating identification module and controlling the power switch tube and be operated in pulsewidth modulation state, the identification module is obtained by the following formula
The inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conducting of the power switch tube
Pressure drop, VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage, TPWMFor the work week of the power switch tube
Phase, D are the conducting dutycycle of the power switch tube, Iind(0) and Iind(N) it is respectively the test voltage injection start time
Input current and the test voltage injection finish time input current.
According to one embodiment of present invention, the conducting dutycycle of the power switch tube meets following formula：
Wherein, D is the conducting dutycycle of the power switch tube, VbdFor the input voltage, VdcFor output electricity
Pressure, L0For the inductance value under the inductance normal condition, IthFor the maximum current value that the power switch tube allows, TPWMFor institute
State the work period of power switch tube.
To achieve the above object, third aspect present invention embodiment proposes a kind of pfc circuit comprising above-mentioned inductance
Device for identifying.
The pfc circuit of the embodiment of the present invention can effectively judge whether inductance is sent out by above-mentioned inductance device for identifying
Raw damage, is replaced in time if damaging, to effectively avoid the power factor emendation function exception caused by inductance damages
Problem, and then ensure that Related product can work normally, ensure the reliability of product, improves user experience.
Description of the drawings
Fig. 1 is the topological diagram of pfc circuit according to an embodiment of the invention；
Fig. 2 is the flow chart of the inductance discrimination method of pfc circuit according to the ... of the embodiment of the present invention；
Fig. 3 is the inductance identification schematic diagram of continuous voltage injection method according to an embodiment of the invention；
Fig. 4 is the inductance identification schematic diagram of modulation voltage injection method according to an embodiment of the invention；
Fig. 5 is the block diagram of the inductance device for identifying of pfc circuit according to the ... of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The pfc circuit proposed according to embodiments of the present invention and its inductance discrimination method and dress described with reference to the accompanying drawings
It sets.
In an embodiment of the present invention, as shown in Figure 1, the circuit of power factor correction of single phase ac input includes control core
Piece, main circuit and detection circuit, main circuit include rectifier bridge, filter capacitor, pfc circuit and big capacity electrolyte capacitor and bear
It carries, pfc circuit includes inductance, power switch tube and diode, wherein power switch tube can be IGBT (Insulated
Gate Bipolar Transistor, insulated gate bipolar transistor) and MOSFET (Metal-Oxide-Semiconductor
Field-Effect Transistor, Metal-Oxide Semiconductor field-effect transistor), diode can be two poles of fast recovery
Pipe.
When power switch tube is opened, input voltage VbdIt is applied on inductance and power switch tube, electric current is from rectifier bridge
Anode exports, and flows through inductance, power switch tube and sampling resistor, returns to the negative terminal of rectifier bridge.Inductive current linearly rises,
Variation relation meets：
Wherein, VbdFor input voltage, L is the inductance value of inductance, IindFor input current, VIGBTFor leading for power switch tube
Logical pressure drop.
When power switch tube turns off, input voltage VbdIt is applied on inductance and diode, anode of the electric current from rectifier bridge
Output, flows through inductance, diode enters electrolytic capacitor and load, and the negative terminal of rectifier bridge is returned to using sampling resistor.It is inputting
Voltage VbdHigher than output voltage VdcWhen, inductive current continues to rise, otherwise electric current declines, and curent change relationship meets：
Wherein, VFRDFor the conduction voltage drop of diode, VdcFor output voltage.
It controls chip and passes through DC voltage (the i.e. input voltage V of pfc circuit after detecting rectifier bridge rectificationbd), inductance electricity
Flow (the i.e. input current I of pfc circuitind) and DC bus-bar voltage (i.e. the voltage namely pfc circuit at electrolytic capacitor both ends is defeated
Go out voltage Vdc) carry out pfc circuit control and inductance identification.Wherein, input current IindResistance sampling method or logical can be used
Cross Hall current sensor detection, input voltage VbdWith output voltage VdcThe detection of electric resistance partial pressure method can be used.
As shown in Fig. 2, the inductance discrimination method of the pfc circuit includes the following steps：
S1 injects test voltage to inductance, and controls power switch tube and be operated in constant conduction state or pulsewidth modulation
State.
Specifically, when needing the inductance to pfc circuit to recognize, test can be injected to inductance by controlling chip
Voltage, while controlling power switch tube and being operated in constant conduction state or pulsewidth modulation state.
S2, detects the input voltage of pfc circuit, and detects the input current of pfc circuit, and detects the defeated of pfc circuit
Go out voltage.
S3 calculates the voltage at inductance both ends according to input voltage and output voltage.
S4 recognizes to obtain electricity inductance according to the variable quantity of the Flux consumption of the voltage at inductance both ends and input current
The inductance value of sense.
Specifically, when being recognized to inductance, control chip injects test voltage to inductance, while controlling power switch
Pipe is operated in constant conduction state or pulsewidth modulation state, and the input of pfc circuit is then detected by the methods of sampling resistor
Electric current Iind, and according to the Flux consumption and input current I of test voltage effectindVariable quantity inductance is recognized, to obtain
Obtain Flux consumption/input current I of inductance value=injection test voltage effect of inductanceindVariable quantity, that is, pass through following formula
(3) inductance value of inductance is obtained：
Wherein, t1And t2Quarter and finish time, I respectively at the beginning of test voltage injectionind(t1) and Iind(t2) respectively
The input current of the input current and test voltage injection finish time of start time, V are injected for test voltageindFor inductance two
The voltage (also referred to as with the counter electromotive force of voltage or inductance generation on inductance) at end, in an embodiment of the present invention, can
The voltage at inductance both ends is calculated by following formula (4)：
Therefore, the inductance discrimination method of the pfc circuit of the embodiment of the present invention by injecting test voltage to inductance, and is controlled
Power switch tube processed is operated in constant conduction state or pulsewidth modulation state, then by detecting inductive current, and according to survey
The variable quantity of Flux consumption and inductive current that voltage acts on is tried to calculate the inductance value of inductance, to judge the electricity according to inductance value
Whether sense is damaged, and is replaced in time if damage, to effectively avoid the pfc circuit power factor caused by inductance damages
The problem of calibration function exception, and then ensure that the Related product with pfc circuit can work normally, ensure the reliable of product
Property, improve user experience.
Further, according to one embodiment of present invention, it when injecting test voltage to inductance, and controls the power and opens
When pass pipe is operated in constant conduction state, the inductance value that following formula (5) obtain inductance can be passed through：
Wherein, TPWMFor the work period of power switch tube, Iind(0) and Iind(N) be respectively test voltage injection start when
The input current of input current and test voltage the injection finish time at quarter.
Specifically, as shown in figure 3, when using continuous voltage injection method, that is, power switch tube is allowed to be operated in persistently open-minded
State, the duty ratio for being equivalent to N number of PWM (Pulse Width Modulation, pulse width modulation) periods is 100%,
V at this timeind=Vbd-VIGBT, then according in N number of PWM cycle test voltage act on Flux consumption and input current variable quantity come
The inductance value of inductance is calculated, i.e., calculates the inductance value of inductance by above-mentioned formula (5).
It should be noted that during being recognized to inductance using continuous voltage injection method, due to input voltage
VbdChanging always, therefore, at least in each PWM cycle to input voltage VbdIt is once sampled, to ensure the essence of identification
Degree.
According to one embodiment of present invention, it when injecting test voltage to inductance, and controls power switch tube and is operated in arteries and veins
When wide modulation condition, the inductance value of inductance can be obtained by following formula (6)：
Wherein, D is the conducting dutycycle of power switch tube, Iind(0) and Iind(N) be respectively test voltage injection start when
The input current of input current and test voltage the injection finish time at quarter.
Specifically, as shown in figure 4, when using modulation voltage injection method, that is, power switch tube is allowed to be operated in pulsewidth modulation
When state, the duty ratio for being equivalent to N number of PWM cycle is adjustable in 0-100% ranges, at this point, the voltage at inductance both endsThen it is acted on according to test voltage in N number of PWM cycle
Flux consumption and the variable quantity of input current calculate the inductance value of inductance, that is, pass through the inductance that above-mentioned formula (6) calculates inductance
Value.
It should be noted that using modulation voltage injection method when, the setting of the conducting dutycycle of power switch tube with it is defeated
Enter voltage Vbd, output voltage Vdc, maximum current value that inductance value and the power switch tube of inductance allow it is related.
If duty ratio is excessive, in input voltage VbdWhen larger, in first PWM cycle, during power switch tube is connected,
It can make input current IindMore than the overcurrent protection threshold value of power switch tube, power switch tube overcurrent is caused.For this purpose, power switch
The conducting dutycycle of pipe needs to meetThat is, in the item for the conduction voltage drop for ignoring power switch tube
Under part, the conducting dutycycle of power switch tube meetsWherein, D is the conducting dutycycle of power switch tube, L0
For the inductance value under inductance normal condition, IthThe maximum current value allowed for power switch tube.
And if duty ratio is too small, in input voltage VbdWhen smaller, input current I can be madeindThere are interrupted feelings
Condition causes inductance value calculation mistake (due to the single-phase on state characteristic of diode, as input current IindWhen decaying to zero, input electricity
Flow IindIt will be unable to continue to reduce and maintain zero, and input current IindIn this period for being zero, voltage-second balance condition is discontented
Foot, therefore discontinuous current can cause weber accumulating error), for this purpose, the conducting dutycycle of power switch tube also needs to meet (Vbd-
VIGBT)·D+(Vbd-VFRD-Vdc)·(1-D)>0, i.e., under conditions of ignoring the conduction voltage drop of power switch tube and diode, work(
The conducting dutycycle of rate switching tube meets
Therefore, it when recognizing the inductance of pfc circuit using modulation voltage injection method, needs to ensure that inductance is operated in
Continuous current mode, the i.e. conducting dutycycle of power switch tube need to meet following formula (7)：
In addition, during being recognized to inductance using modulation voltage injection method, due to input voltage VbdAnd output
Voltage VdcChanging always, therefore, at least in each PWM cycle to input voltage VbdWith output voltage VdcOnce sampled,
To ensure the precision of identification.
It should be noted that in an embodiment of the present invention, when inductance value is less thanWhen, modulation voltage need to be used
Injection method carries out inductance identification, and no it will cause overcurrents；When inductance is not less thanWhen, continuous voltage injection method and modulation
Voltage injection method may serve to carry out inductance identification.In addition, in identification process, PWM frequency, electric current and electricity are improved as far as possible
The detection frequency of pressure helps to improve the precision of inductance identification.
In conclusion the inductance discrimination method of the pfc circuit of the embodiment of the present invention, by injecting test voltage to inductance,
And control power switch tube and be operated in constant conduction state or pulsewidth modulation state, the weber then acted on according to test voltage
It counts and calculates the inductance value of inductance with the variable quantity of inductive current, to judge whether the inductance is damaged according to inductance value,
It is replaced in time if damaging, to effectively avoid the pfc circuit power factor emendation function exception caused by inductance damages
Problem, and then ensure that the Related product with pfc circuit can work normally, ensure the reliability of product, improves user experience.
Fig. 5 is the block diagram of the inductance device for identifying of pfc circuit according to the ... of the embodiment of the present invention.
In an embodiment of the present invention, as shown in Figure 1, pfc circuit includes inductance L1, power switch tube Q and diode
FRD, particular circuit configurations and operation principle are already described above, and which is not described herein again.
As shown in figure 4, the inductance device for identifying of the pfc circuit includes：Injection module 10, voltage detection module 20, electric current
Detection module 30 and identification module 40.
Wherein, injection module 10 is used to inject test voltage to inductance L1.Voltage detection module 20 is for detecting pfc circuit
Input voltage VbdWith the output voltage V of pfc circuitdc.Current detection module 30 is used to detect the input current of pfc circuit
Iind.Identification module 40 is connected with injection module 10, voltage detection module 20 and current detection module 30 respectively, recognizes module 40
It is operated in constant conduction state or pulsewidth modulation state for controlling power switch tube Q, and according to input voltage VbdAnd output
Voltage VdcCalculate the voltage at inductance L1 both ends, and the voltage according to the both ends inductance L1 Flux consumption and input current IindChange
Change amount recognizes inductance L1 to obtain the inductance value of inductance.
Specifically, injection module 10 and identification module 40 can integrate in control chip in Fig. 1.When needing to PFC
When the inductance L1 of circuit is recognized, test voltage can be injected to inductance L1 by injection module 10, while by recognizing mould
Block 40 controls power switch tube Q and is operated in constant conduction state or pulsewidth modulation state, and then, identification module 40 is according to injection
Test voltage effect Flux consumption and input current IindVariable quantity inductance L1 is recognized, to obtain inductance L1's
Flux consumption/input current I of inductance value=injection test voltage effectindVariable quantity, that is, pass through above-mentioned formula (3) obtain electricity
Feel the inductance value of L1.
Therefore, the inductance device for identifying of the pfc circuit of the embodiment of the present invention by injecting test voltage to inductance, and is controlled
Power switch tube processed is operated in constant conduction state or pulsewidth modulation state, then by detecting inductive current, and according to survey
The variable quantity of Flux consumption and inductive current that voltage acts on is tried to calculate the inductance value of inductance, to judge the electricity according to inductance value
Whether sense is damaged, and is replaced in time if damage, to effectively avoid the pfc circuit power factor caused by inductance damages
The problem of calibration function exception, and then ensure that the Related product with pfc circuit can work normally, ensure the reliable of product
Property, improve user experience.
Further, when injection module 10 injects test voltage, and the identification control power switch tube of module 40 Q to inductance L1
When being operated in constant conduction state, the inductance value of inductance can be obtained by above-mentioned formula (5).
Specifically, as shown in figure 3, when using continuous voltage injection method, that is, power switch tube Q is allowed to be operated in persistently open-minded
State, the duty ratio for being equivalent to N number of PWM cycle are 100%, at this time Vind=Vbd-VIGBT, module 40 is then recognized according to N number of
The variable quantity of test voltage acts in PWM cycle Flux consumption and input current calculates the inductance value of inductance, i.e., by above-mentioned
Formula (5) calculates the inductance value of inductance.
It should be noted that during being recognized to inductance using continuous voltage injection method, due to input voltage
VbdChanging always, therefore, voltage detection module 20 is at least in each PWM cycle to input voltage VbdOnce sampled, with
Ensure the precision of identification.
According to one embodiment of present invention, when injection module 10 injects test voltage, and the identification control of module 40 to inductance
When power switch tube Q processed is operated in pulsewidth modulation state, the inductance value of inductance can be obtained by above-mentioned formula (6).
Specifically, as shown in figure 4, when using modulation voltage injection method, that is, power switch tube Q is allowed to be operated in pulsewidth modulation
When state, the duty ratio for being equivalent to N number of PWM cycle is adjustable in 0-100% ranges, at this point, the voltage at the both ends inductance L1Then, identification module 40 in N number of PWM cycle according to surveying
The variable quantity of Flux consumption and input current that voltage acts on is tried to calculate the inductance value of inductance, that is, passes through above-mentioned formula (6) and calculates
The inductance value of inductance.
It should be noted that using modulation voltage injection method when, the setting of the conducting dutycycle of power switch tube with it is defeated
Enter voltage Vbd, output voltage Vdc, maximum current value that inductance value and the power switch tube of inductance allow it is related.
If duty ratio is excessive, in input voltage VbdWhen larger, in first PWM cycle, the phase is connected in power switch tube Q
Between, input current I can be madeindOvercurrent protection threshold value more than power switch tube Q causes power switch tube Q overcurrents.For this purpose, power
The conducting dutycycle of switching tube needs to meetThat is, in the conduction voltage drop for ignoring power switch tube Q
Under conditions of, the conducting dutycycle of power switch tube meetsWherein, D is the conducting duty of power switch tube
Than L0For the inductance value under inductance normal condition, IthThe maximum current value allowed for power switch tube.
And if duty ratio is too small, in input voltage VbdWhen smaller, input current I can be madeindThere are interrupted feelings
Condition causes inductance value calculation mistake (due to the single-phase on state characteristic of diode FRD, as input current IindIt is defeated when decaying to zero
Enter electric current IindIt will be unable to continue to reduce and maintain zero, and input current IindIn this period for being zero, voltage-second balance condition
It is unsatisfactory for, therefore discontinuous current can cause weber accumulating error), for this purpose, the conducting dutycycle of power switch tube also needs to meet
(Vbd-VIGBT)·D+(Vbd-VFRD-Vdc)·(1-D)>0, that is, ignoring the conduction voltage drop of power switch tube Q and diode FRD
Under the conditions of, the conducting dutycycle of power switch tube meets
Therefore, it when recognizing the inductance of pfc circuit using modulation voltage injection method, needs to ensure that inductance is operated in
Continuous current mode, the i.e. conducting dutycycle of power switch tube need to meet above-mentioned formula (7).In addition, being noted using modulation voltage
Enter during method recognizes inductance, due to input voltage VbdWith output voltage VdcChanging always, therefore, voltage inspection
Module 20 is surveyed at least in each PWM cycle to input voltage VbdWith output voltage VdcIt is once sampled, to ensure the essence of identification
Degree.
It should be noted that in an embodiment of the present invention, when inductance value is less thanWhen, modulation voltage need to be used
Injection method carries out inductance identification, and no it will cause overcurrents；When inductance is not less thanWhen, continuous voltage injection method and modulation
Voltage injection method may serve to carry out inductance identification.In addition, in identification process, PWM frequency, electric current and electricity are improved as far as possible
The detection frequency of pressure helps to improve the precision of inductance identification.
The inductance device for identifying of pfc circuit according to the ... of the embodiment of the present invention by injecting test voltage to inductance, and controls
Power switch tube operation duration conducting state or pulsewidth modulation state, then by detecting inductive current, and according to test electricity
The Flux consumption of pressure effect and the variable quantity of inductive current calculate the inductance value of inductance, to be to judge the inductance according to inductance value
It is no to be damaged, it is replaced in time if damage, to effectively avoid the pfc circuit PFC caused by inductance damages
The problem of dysfunction, and then ensure that the Related product with pfc circuit can work normally, ensure the reliability of product, carries
High user experience.
In addition, the embodiment of the present invention also proposed a kind of pfc circuit comprising above-mentioned inductance device for identifying.
The pfc circuit of the embodiment of the present invention can effectively judge whether inductance is sent out by above-mentioned inductance device for identifying
Raw damage, is replaced in time if damaging, to effectively avoid the power factor emendation function exception caused by inductance damages
Problem, and then ensure that Related product can work normally, ensure the reliability of product, improves user experience.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implies relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (9)
1. a kind of inductance discrimination method of PFC pfc circuit, which is characterized in that the pfc circuit includes inductance, work(
Rate switching tube and diode, the described method comprises the following steps：
Test voltage is injected to the inductance, and controls the power switch tube and is operated in constant conduction state or pulsewidth modulation
State；
The input voltage of the pfc circuit is detected, and detects the input current of the pfc circuit, and the detection pfc circuit
Output voltage；
The voltage at the inductance both ends is calculated according to the input voltage and the output voltage；And
According to the variable quantity of the Flux consumption of the voltage at the inductance both ends and the input current to the inductance recognized with
Obtain the inductance value of the inductance, wherein when injecting the test voltage to the inductance, and control the power switch plumber
Make in pulsewidth modulation state, is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conduction voltage drop of the power switch tube,
VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage, TPWMFor the work period of the power switch tube, D is
The conducting dutycycle of the power switch tube, Iind(0) and Iind(N) be respectively test voltage injection start time input
The conducting dutycycle of the input current of electric current and test voltage injection finish time, the power switch tube meets following public affairs
Formula：
Wherein, D is the conducting dutycycle of the power switch tube, VbdFor the input voltage, VdcFor the output voltage, L0For
Inductance value under the inductance normal condition, IthFor the maximum current value that the power switch tube allows, TPWMIt is opened for the power
Close the work period of pipe.
2. the inductance discrimination method of pfc circuit according to claim 1, which is characterized in that be obtained by the following formula institute
State the inductance value of inductance：
Wherein, L is the inductance value of the inductance, VindFor the voltage at the inductance both ends, t1And t2The respectively described test voltage
Quarter and finish time, I at the beginning of injectionind(t1) and Iind(t2) it is respectively the input that the test voltage injects start time
The input current of electric current and test voltage injection finish time.
3. the inductance discrimination method of pfc circuit according to claim 2, which is characterized in that be calculated by the following formula institute
State the voltage at inductance both ends：
Wherein, VindFor the voltage at the inductance both ends, VbdFor the input voltage, VIGBTFor the conducting of the power switch tube
Pressure drop, VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage.
4. the inductance discrimination method of pfc circuit according to any one of claim 1-3, which is characterized in that when to described
Inductance injects test voltage, and when controlling the power switch tube and being operated in constant conduction state, is obtained by the following formula institute
State the inductance value of inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conduction voltage drop of the power switch tube,
TPWMFor the work period of the power switch tube, Iind(0) and Iind(N) it is respectively the test voltage injection start time
The input current of input current and test voltage injection finish time.
5. a kind of inductance device for identifying of PFC pfc circuit, which is characterized in that the pfc circuit includes inductance, work(
Rate switching tube and diode, described device include：
Injection module, the injection module are used to inject test voltage to the inductance；
Voltage detection module, input voltage and the pfc circuit of the voltage detection module for detecting the pfc circuit
Output voltage；
Current detection module, the current detection module are used to detect the input current of the pfc circuit；
Recognize module, the identification module respectively with the injection module, the voltage detection module and the current detecting mould
Block is connected, and the identification module is operated in constant conduction state or pulsewidth modulation state for controlling the power switch tube,
And the voltage at the inductance both ends is calculated according to the input voltage and the output voltage, and according to the inductance both ends
The variable quantity of the Flux consumption of voltage and the input current recognizes to obtain the inductance value of the inductance inductance,
In, when the injection module injects the test voltage, and the identification module control power switch tube to the inductance
When being operated in pulsewidth modulation state, the identification module is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conduction voltage drop of the power switch tube,
VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage, TPWMFor the work period of the power switch tube, D is
The conducting dutycycle of the power switch tube, Iind(0) and Iind(N) be respectively test voltage injection start time input
The conducting dutycycle of the input current of electric current and test voltage injection finish time, the power switch tube meets following public affairs
Formula：
Wherein, D is the conducting dutycycle of the power switch tube, VbdFor the input voltage, VdcFor the output voltage, L0For
Inductance value under the inductance normal condition, IthFor the maximum current value that the power switch tube allows, TPWMIt is opened for the power
Close the work period of pipe.
6. the inductance device for identifying of pfc circuit according to claim 5, which is characterized in that the identification module by with
Lower formula obtains the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VindFor the voltage at the inductance both ends, t1And t2The respectively described test voltage
Quarter and finish time, I at the beginning of injectionind(t1) and Iind(t2) it is respectively the input that the test voltage injects start time
The input current of electric current and test voltage injection finish time.
7. the inductance device for identifying of pfc circuit according to claim 6, which is characterized in that the identification module by with
Lower formula calculates the voltage at the inductance both ends：
Wherein, VindFor the voltage at the inductance both ends, VbdFor the input voltage, VIGBTFor the conducting of the power switch tube
Pressure drop, VFRDFor the conduction voltage drop of the diode, VdcFor the output voltage.
8. the inductance device for identifying of the pfc circuit according to any one of claim 5-7, which is characterized in that when the note
Enter module and inject test voltage to the inductance, and the identification module controls the power switch tube and is operated in constant conduction shape
When state, the identification module is obtained by the following formula the inductance value of the inductance：
Wherein, L is the inductance value of the inductance, VbdFor the input voltage, VIGBTFor the conduction voltage drop of the power switch tube,
TPWMFor the work period of the power switch tube, Iind(0) and Iind(N) it is respectively the test voltage injection start time
The input current of input current and test voltage injection finish time.
9. a kind of PFC pfc circuit, which is characterized in that include the electricity according to any one of claim 5-8
Feel device for identifying.
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| CN113191033B (en) * | 2021-04-21 | 2023-03-28 | 上海工程技术大学 | Inductance simulation method for BOOST circuit inductance device |
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| US6847195B2 (en) * | 2002-08-07 | 2005-01-25 | Skynet Electronic Co., Ltd. | Auxiliary circuit for power factor corrector having self-power supplying and zero current detection mechanisms |
| CN102497700A (en) * | 2011-12-05 | 2012-06-13 | 北方工业大学 | Power factor correction method for LED (light-emitting diode) lighting |
| CN105242118A (en) * | 2015-10-26 | 2016-01-13 | 广东美的制冷设备有限公司 | Inductance detection method for power factor correction PFC circuit and device |
| CN105429451A (en) * | 2015-12-08 | 2016-03-23 | 广东美的制冷设备有限公司 | PFC inductor saturation suppression circuit and method and power equipment |
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2016
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6847195B2 (en) * | 2002-08-07 | 2005-01-25 | Skynet Electronic Co., Ltd. | Auxiliary circuit for power factor corrector having self-power supplying and zero current detection mechanisms |
| CN102497700A (en) * | 2011-12-05 | 2012-06-13 | 北方工业大学 | Power factor correction method for LED (light-emitting diode) lighting |
| CN105242118A (en) * | 2015-10-26 | 2016-01-13 | 广东美的制冷设备有限公司 | Inductance detection method for power factor correction PFC circuit and device |
| CN105429451A (en) * | 2015-12-08 | 2016-03-23 | 广东美的制冷设备有限公司 | PFC inductor saturation suppression circuit and method and power equipment |
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