CN105242118A - Inductance detection method for power factor correction PFC circuit and device - Google Patents
Inductance detection method for power factor correction PFC circuit and device Download PDFInfo
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- CN105242118A CN105242118A CN201510705587.0A CN201510705587A CN105242118A CN 105242118 A CN105242118 A CN 105242118A CN 201510705587 A CN201510705587 A CN 201510705587A CN 105242118 A CN105242118 A CN 105242118A
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Abstract
The invention discloses an inductance detection method for a power factor correction PFC circuit and a device. The PFC circuit comprises an inductor, a power switch tube and a diode. The inductor detection method comprises steps of detecting voltage inputted into the PFC circuit in order to obtain an input voltage instantaneous value, controlling the power switch tube to be conducted when the input voltage instantaneous value is within the preset voltage range, detecting current flowing through the inductor during the conduction period of the power switch tube, calculating the inductor current rate of change according to the detected current flowing through the inductor, and calculating the inductance value of the inductor according to the inductor current rate of change and the input voltage instantaneous value when the power switch tube is conducted so as to realize the effective detection of the inductor parameter and so as to find the inductor abnormality early and find a protection measure.
Description
Technical field
The present invention relates to power factor correction technology field, particularly a kind of inductance detection method of power factor correction pfc circuit and a kind of inductance detection device of power factor correction pfc circuit.
Background technology
In order to reduce current harmonics and reactive power that consumer produces to the pollution of electrical network, China has promulgated the national standard of brownout device current harmonic wave, can come into the market just consumer only meets corresponding harmonic standard.For making consumer meet harmonic standard, power factor correction (PFC, PowerFactorCorrection) need be carried out to it.
For improving the power factor of consumer and reducing current harmonics, correlation technique proposes a kind of power factor corrector carrying out copped wave at AC, this corrector is by detecting voltage over zero, and after zero crossing being detected, carry out the action of several times boosted switch at every turn, reach and increase electric current turn-on angle and the object reducing Harmonics of Input.Correlation technique also proposed a kind of power factor corrector of high-speed switch.
The power factor corrector that correlation technique proposes all can, while raising consumer power factor, make Harmonics of Input meet national standard.But, its shortcoming existed is, power factor corrector is in transport, manufacture or the course of work in, obvious change may be there is in the characteristic of its inductance, such as, the inductance being magnetic core with iron sial may produce the crackle on magnetic core under physical shock, thus cause inductance verification to decay, take siliconized plate as the inductance of magnetic core, when enameled wire leaks electricity, also the abnormal conditions that sensibility reciprocal declines to a great extent may be there are, when there is relatively large deviation in the inductance parameters of power factor corrector, its input current more will can produce more serious harmonic wave, or there is the phenomenon of momentary excess current, easily cause circuit malfunction.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.For this reason, one object of the present invention is a kind of inductance detection method proposing power factor correction pfc circuit.
Another object of the present invention is the inductance detection device proposing a kind of power factor correction pfc circuit.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of inductance detection method of power factor correction pfc circuit, described pfc circuit comprises inductance, power switch pipe and diode, described inductance detection method comprises the following steps: detection is input to the voltage of described pfc circuit to obtain input voltage instantaneous value, and it is open-minded to control described power switch pipe when described input voltage instantaneous value is in predeterminated voltage interval; Open period at described power switch pipe, detect the electric current flowing through described inductance; According to the Current calculation inductive current rate of change flowing through inductance described in detecting, and input voltage instantaneous value when opening according to described inductive current rate of change and described power switch pipe calculates the inductance value of described inductance.
According to the inductance detection method of the pfc circuit that the embodiment of the present invention proposes, detection is input to the voltage of pfc circuit to obtain input voltage instantaneous value, and control power switch pipe when input voltage instantaneous value is in predeterminated voltage interval open-minded, period is opened at power switch pipe, detect the electric current flowing through inductance, and according to the Current calculation inductive current rate of change flowing through inductance detected, and input voltage instantaneous value when opening according to inductive current rate of change and power switch pipe calculates the inductance value of inductance, thus effective detection of inductance parameters can be realized, thus inductance exception can be found in advance and take corresponding safeguard measure.
According to some embodiments of the present invention, according to the Current calculation inductive current rate of change flowing through inductance described in detecting, specifically comprise: obtain the first inductor current value and the second inductor current value at default sampling time interval; Described inductive current rate of change is calculated according to described first inductor current value and the second inductor current value, described default sampling time interval.
According to some embodiments of the present invention, inductance value according to following formulae discovery:
Wherein, L
estfor described inductance value, V
infor input voltage instantaneous value when described power switch pipe is opened, I
2for described second inductor current value, I
1for described first inductor current value, T
rfor described default sampling time interval.
According to some embodiments of the present invention, the inductance detection method of described power factor correction pfc circuit also comprises: after described power switch pipe opens Preset Time, control described power switch pipe close.
According to some embodiments of the present invention, the inductance detection method of described power factor correction pfc circuit also comprises: when described inductance value is less than default inductance value, protect described pfc circuit according to default Preservation tactics.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of inductance detection device of power factor correction pfc circuit, described pfc circuit comprises inductance, power switch pipe and diode, described inductance detection device comprises: voltage detection module, for detect be input to described pfc circuit voltage to obtain input voltage instantaneous value; Current detection module, for detecting the electric current flowing through described inductance; Control module, open-minded for controlling described power switch pipe when described input voltage instantaneous value is in predeterminated voltage interval; Inductance computing module, the electric current flowing through described inductance is detected by described current detection module for opening period at described power switch pipe, and according to flowing through the Current calculation inductive current rate of change of inductance described in detecting, and input voltage instantaneous value when opening according to described inductive current rate of change and described power switch pipe calculates the inductance value of described inductance.
According to the inductance detection device of the pfc circuit that the embodiment of the present invention proposes, the voltage of pfc circuit is input to obtain input voltage instantaneous value by voltage detection module detection, and control module control power switch pipe is open-minded when input voltage instantaneous value is in predeterminated voltage interval, period is opened at power switch pipe, the electric current flowing through inductance is detected by electric six detection modules, inductance computing module is according to the Current calculation inductive current rate of change flowing through inductance detected, and input voltage instantaneous value when opening according to inductive current rate of change and power switch pipe calculates the inductance value of inductance, thus effective detection of inductance parameters can be realized, thus inductance exception can be found in advance and take corresponding safeguard measure.
According to some embodiments of the present invention, described inductance computing module specifically for, obtain the first inductor current value and the second inductor current value at default sampling time interval, and calculate described inductive current rate of change according to described first inductor current value and the second inductor current value, described default sampling time interval.
According to some embodiments of the present invention, described inductance computing module inductance value according to following formulae discovery:
Wherein, L
estfor described inductance value, V
infor input voltage instantaneous value when described power switch pipe is opened, I
2for described second inductor current value, I
1for described first inductor current value, T
rfor described default sampling time interval.
According to some embodiments of the present invention, described control module also for, control after described power switch pipe opens Preset Time described power switch pipe close.
According to some embodiments of the present invention, described control module also for, when described inductance value is less than default inductance value, according to default Preservation tactics, described pfc circuit is protected.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inductance detection method of power factor correction pfc circuit according to the embodiment of the present invention;
Fig. 2 is the principle schematic of the inductance detection method of power factor correction pfc circuit according to the embodiment of the present invention;
Fig. 3 is the process flow diagram of the inductance detection method of power factor correction pfc circuit according to an embodiment of the invention;
Fig. 4 is the block diagram of the inductance detection device of power factor correction pfc circuit according to the embodiment of the present invention; And
Fig. 5 is the schematic diagram of the inductance computing module of power factor correction pfc circuit according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings inductance detection method and the device of the power factor correction pfc circuit that the embodiment of the present invention proposes are described.
Wherein, power factor correction pfc circuit can be connected in the electric supply installation of convertible frequency air-conditioner.As shown in Figure 4, the electric supply installation of convertible frequency air-conditioner can comprise rectification circuit 10, PFC (PowerFactorCorrection, power factor correction) circuit 20 and electrochemical capacitor E1.Wherein, the input end of rectification circuit 10 is connected with single phase alternating current power supply AC, and rectification circuit 10 carries out rectification to obtain the direct current after rectification for the single-phase alternating current provided by single phase alternating current power supply AC; Pfc circuit 20 is connected between the output terminal of rectification circuit 10 and electrochemical capacitor E1, and pfc circuit 20 is for carrying out power factor correction to power supply; Electrochemical capacitor E1 is in parallel with load 30.Wherein, load 30 can be preferably compressor M, and load 30 also can be internal switch power supply, DC fan etc.
That is, single phase alternating current power supply AC, through the uncontrollable full-wave rectification of rectification circuit 10, then through pfc circuit 20, exports and receives jumbo electrochemical capacitor E1, and then powers to load 30.
More specifically, pfc circuit 20 can adopt the pfc circuit with boost function, also can adopt the pfc circuit without boost function.As shown in Figure 4, pfc circuit 20 can adopt the Boost type pfc circuit with boost function, Boost type pfc circuit can comprise inductance L 1, power switch tube S 1 and diode D1, wherein, one end of inductance L 1 is connected with the first output terminal of rectification circuit 10, the other end of inductance L 1 is connected with the anode of diode D1, has first node between inductance L 1 and diode D1; The negative electrode of diode D1 is connected with the positive terminal of electrochemical capacitor E1; The collector of power switch tube S 1 is connected with first node, and the emitter of power switch tube S 1 is connected with the negative pole end of electrochemical capacitor E1 with the second output terminal of rectification circuit 10 respectively, and the grid of power switch tube S 1 is used for reception control signal.
The pfc circuit of composition graphs 4, one aspect of the present invention embodiment proposes a kind of inductance detection method of power factor correction pfc circuit.
Fig. 1 is the process flow diagram of the inductance detection method of power factor correction pfc circuit according to the embodiment of the present invention.Pfc circuit comprises inductance, power switch pipe and diode.As shown in Figure 1, the inductance detection method of this power factor correction pfc circuit comprises the following steps:
S1: detection is input to the voltage of pfc circuit to obtain input voltage instantaneous value, and control power switch pipe when input voltage instantaneous value is in predeterminated voltage interval open-minded.
Wherein, the voltage being input to pfc circuit is the voltage after rectification.According to a concrete example of the present invention, detect the voltage being input to pfc circuit by divider resistance R1 and R2 shown in Fig. 4.
According to a concrete example of the present invention, as shown in Figure 2, predeterminated voltage interval can be (Vtl, Vth), judge input voltage instantaneous value whether in predeterminated voltage interval like this, be and judge whether input voltage instantaneous value is greater than Vtl and is less than Vth, when input voltage instantaneous value is greater than Vtl and is less than Vth, illustrate that input voltage instantaneous value is in predeterminated voltage interval, now control power switch pipe open-minded, as the example of Fig. 2, when input voltage instantaneous value reaches Vtl, switch controlling signal becomes high level, and power switch pipe is open-minded.
It should be noted that, Vtl and Vth can between the 30%-60% of AC-input voltage peak value value, and ensure Vtl<Vth.Such as, when inputting for 220V AC value, input voltage peak value is 310V, then Vtl and Vth can between 93V to 182V value.
S2: open period at power switch pipe, detects the electric current flowing through inductance.
According to one embodiment of present invention, the inductance detection method of pfc circuit also comprises: after power switch pipe opens Preset Time, control power switch pipe close.Wherein, the desirable Microsecond grade of Preset Time, such as can be 5-30us.
Specifically, open or close under the switch controlling signal that power switch pipe can export in control module controls.As the example of Fig. 2, when switch controlling signal is high level, power switch pipe is open-minded, electric current will be had to flow through inductance, and the electric current that the example as Fig. 2 flows through inductance raises rapidly, produces measurable inductive current.After the high level of lasting output preset time T, switch controlling signal becomes low level, power switch pipe is closed, namely control to close after power switch pipe continues to open preset time T, Preset Time is the lasting service time of power switch pipe, thus, because of Preset Time very short (Microsecond grade), power switch pipe is equivalent under pulse voltage effect open-minded.
Particularly, as shown in Figure 3, the inductance detection method of the embodiment of the present invention comprises the following steps:
S101: judge whether to receive inductance detection instruction.If so, then step S102 is performed; If not, then step S101 is returned.
S102: detection is input to the voltage of pfc circuit to obtain input voltage instantaneous value.
S103: judge whether input voltage instantaneous value is greater than Vtl and is less than Vth.If so, then step S104 is performed; If not, then step S103 is returned.
S104: control power switch pipe open-minded.
S105: after power switch pipe continues to open preset time T, controls power switch pipe and closes.
Wherein, the electric current after the electric current flowing through inductance is rectification or for being input to PFC electric current.According to a concrete example of the present invention, detect the electric current flowing through inductance by the noninductive resistance R3 shown in Fig. 4.In practical application, alternate manner also can be utilized to realize inductive current and to detect, such as Hall element.
S3: according to the Current calculation inductive current rate of change flowing through inductance detected, and input voltage instantaneous value when opening according to inductive current rate of change and power switch pipe calculates the inductance value of inductance.
That is, the inductance detection method of the embodiment of the present invention, by detecting the inductive current rate of change under pulse voltage effect, determines the inductance value of inductance.
It should be noted that, from embodiment above, the service time of power switch pipe is very short, reach Microsecond grade, like this power switch pipe open period, the voltage being input to pfc circuit remains unchanged substantially, and input voltage instantaneous value when therefore can open according to power switch pipe calculates the inductance value of inductance.
Specifically, in embodiments of the present invention, first can detect the input voltage instantaneous value of pfc circuit, and judge input voltage instantaneous value whether in predeterminated voltage interval, when input voltage instantaneous value is in predeterminated voltage interval, open the power switch pipe of connecting with inductance, and control power switch pipe in preset time T, keep open-minded, rise gradually to make the electric current flowing through inductance, and calculate inductive current rate of change in this process, and according to inductive current rate of change and input voltage instantaneous value, calculate the estimated value of inductance value.
Thus, the inductance detection method of the embodiment of the present invention can realize effective detection of inductance parameters, thus can find inductance exception in advance and take corresponding safeguard measure.In addition, power factor corrector mostly has the power switch pipe of connecting with inductance and the current detection module for detecting inductive current, and therefore, this method is without the need to increasing extra hardware cost.
According to a specific embodiment of the present invention, according to the Current calculation inductive current rate of change flowing through inductance detected, specifically comprise: obtain the first inductor current value and the second inductor current value at default sampling time interval; According to the first inductor current value and the second inductor current value, preset sampling time interval calculating inductive current rate of change.
Particularly, can according to following formulae discovery inductance value:
Wherein, L
estfor inductance value, V
infor input voltage instantaneous value when power switch pipe is opened, I
2be second inductor current value, I
1be first inductor current value, T
rfor default sampling time interval.
Specifically, in power switch pipe opening process, double sampling can be carried out to the electric current flowing through inductance, as the example of Fig. 2, carry out first time sampling to obtain first inductor current value I at sampling instant T1
1, carry out second time sampling to obtain second inductor current value I at sampling instant T2
2.Thus, at acquisition I
1and I
2after, the difference between sampling instant T2 and employing moment T1 is default sampling time interval T
r, and then inductive current rate of change can be calculated, and input voltage instantaneous value V when opening according to current changing rate and power switch pipe
incalculate inductance value L
est.That is, at first inductor current value I
1, second inductor current value I
2, preset sampling time interval T
rwith input voltage instantaneous value V
inwhen all known, can according to formulae discovery
the estimated value L of inductance value
est.
Wherein, sampling time interval T is preset
r=T2-T1, T1 and T2 are respectively the sampling instant that power switch pipe continues in service time T.Preset sampling time interval T
rreasonable setting, in T1 to T2 time interval, need ensure that inductive current has enough large rate of change, guarantees that inductive current can not be excessive again, in order to avoid cause overcurrent fault simultaneously.
Provide T below
r, T1 and T2 exploitation example: suppose that inductance value nominal value is L0=400uH, Vtl is taken as 150V, Vth is taken as 160V, for guaranteeing that total rate of change of inductive current is near dI=10A, and desirable lasting service time T=2*L0*dI/ (Vtl+Vth)=25.8us.In order to ensure the ringing that current sample point is avoided power switch pipe action and caused, desirable T1=10%T, T2=90%T, therefore, T
r=T2-T1=20.6us.
In addition, the inductance detection method of power factor correction pfc circuit also comprises: when inductance value is less than default inductance value, protects pfc circuit according to default Preservation tactics.That is, when inductance value is less than default inductance value, illustrate that inductance is in abnormality, safeguard measure can be taked in advance, such as, control power factor correction pfc circuit not enable, or utilize communication interface to send the cue etc. of sensibility reciprocal exception.
In addition, it should be noted that, because the inductance detection method of the embodiment of the present invention may cause certain current spike in the course of work, normally carrying out of power factor correction pfc circuit may be affected, therefore, the inductance detection method of the embodiment of the present invention need be performed before pfc circuit normally works.
In sum, according to the inductance detection method of the pfc circuit that the embodiment of the present invention proposes, detection is input to the voltage of pfc circuit to obtain input voltage instantaneous value, and control power switch pipe when input voltage instantaneous value is in predeterminated voltage interval open-minded, period is opened at power switch pipe, detect the electric current flowing through inductance, and according to the Current calculation inductive current rate of change flowing through inductance detected, and input voltage instantaneous value when opening according to inductive current rate of change and power switch pipe calculates the inductance value of inductance, thus effective detection of inductance parameters can be realized, thus inductance exception can be found in advance and take corresponding safeguard measure.
The present invention on the other hand embodiment also proposed a kind of inductance detection device of power factor correction pfc circuit.
Fig. 4 is the schematic diagram of the inductance detection device of power factor correction pfc circuit according to the embodiment of the present invention.As shown in Figure 4, pfc circuit comprises inductance L 1, power switch tube S 1 and diode D1, and inductance detection device 100 comprises: voltage detection module 101, current detection module 102, control module 103 and inductance computing module 104.
Wherein, voltage detection module 101 for detect be input to pfc circuit 10 voltage to obtain input voltage instantaneous value.Wherein, the voltage being input to pfc circuit 10 is the voltage after rectification.Specifically, voltage detection module 101 can comprise voltage detection unit and voltage signal processing unit, wherein, voltage signal processing unit can be single-chip microcomputer (MCU) or digital signal processor (DSP), voltage detection unit for detect be input to pfc circuit 10 voltage with voltage sense signal; The voltage detection signal that voltage signal processing unit is used for voltage detection unit exports processes to obtain input voltage instantaneous value, namely says that voltage detection module 101 is by single-chip microcomputer (MCU) or digital signal processor (DSP) and in conjunction with voltage detection unit acquisition input voltage instantaneous value.According to a concrete example of the present invention, voltage detection unit comprises divider resistance R1 and R2 shown in Fig. 4.
Current detection module 102 flows through the electric current of inductance L 1 for detecting.Wherein, the electric current after the electric current flowing through inductance is rectification or for being input to PFC electric current.Specifically, current detection module 102 can comprise current detecting unit and current signal processing unit, wherein, current signal processing unit can be single-chip microcomputer (MCU) or digital signal processor (DSP), current detecting unit for detect flow through inductance L 1 electric current with output electric current measure signal; The current detection signal that current signal processing unit is used for current detecting unit exports processes to obtain inductor current value, namely says that current detection module 102 is by single-chip microcomputer (MCU) or digital signal processor (DSP) and in conjunction with current detecting unit acquisition inductor current value.According to a concrete example of the present invention, current detecting unit comprises the noninductive resistance R3 shown in Fig. 4.In practical application, alternate manner also can be utilized to realize inductive current and to detect, such as Hall element.
Control module 103 is open-minded for controlling power switch pipe Q1 when input voltage instantaneous value is in predeterminated voltage interval.
According to one embodiment of present invention, control module 103 also for: after power switch pipe Q1 open Preset Time, control power switch pipe Q1 close.Wherein, the desirable Microsecond grade of Preset Time, such as can be 5-30us.
Specifically, open or close under the switch controlling signal that power switch pipe Q1 can export in control module 103 controls.As the example of Fig. 2, when switch controlling signal is high level, power switch pipe Q1 is open-minded, electric current will be had to flow through inductance, and the electric current that the example as Fig. 2 flows through inductance raises rapidly, produces measurable inductive current.After the high level of lasting output preset time T, switch controlling signal becomes low level, power switch pipe Q1 closes, namely control module 103 controls to close after power switch pipe Q1 continues to open preset time T, Preset Time is the lasting service time of power switch pipe, thus, because of Preset Time very short (Microsecond grade), power switch pipe Q1 is equivalent under pulse voltage effect open-minded.
Inductance computing module 104 detects for opening period at power switch pipe the electric current flowing through inductance by current detection module 102, and according to the Current calculation inductive current rate of change flowing through inductance detected, and input voltage instantaneous value when opening according to inductive current rate of change and power switch pipe calculates the inductance value of inductance, wherein, control module 103 and inductance computing module 104 can be single-chip microcomputer (MCU) or digital signal processor (DSP).That is, inductance computing module 104, by detecting the inductive current rate of change under pulse voltage effect, determines the inductance value of inductance L 1.
It should be noted that, from embodiment above, the service time of power switch pipe is very short, reach Microsecond grade, like this power switch pipe open period, the voltage being input to pfc circuit remains unchanged substantially, and input voltage instantaneous value when therefore can open according to power switch pipe calculates the inductance value of inductance.
Specifically, in embodiments of the present invention, the input voltage instantaneous value of pfc circuit 20 first can be detected by voltage detection module 101, then, control module 103 judges input voltage instantaneous value whether in predeterminated voltage interval, when input voltage instantaneous value is in predeterminated voltage interval, control module 103 controls power switch pipe Q1 in preset time T, keeps open-minded, rise gradually to make the electric current flowing through inductance L 1, inductance computing module 104 can calculate inductive current rate of change in this process, and according to inductive current rate of change and input voltage instantaneous value, calculate the estimated value of inductance value.
Thus, the inductance detection device of the embodiment of the present invention can realize effective detection of inductance parameters, thus can find inductance exception in advance and take corresponding safeguard measure.In addition, power factor corrector mostly has the power switch pipe of connecting with inductance and the current detection module for detecting inductive current, and therefore, this method is without the need to increasing extra hardware cost.
According to a concrete example of the present invention, as shown in Figure 2, predeterminated voltage interval can be (Vtl, Vth), such control module 103 can judge that whether input voltage instantaneous value is at predeterminated voltage interval (Vtl, Vth) in, be and judge whether input voltage instantaneous value is greater than Vtl and is less than Vth, when input voltage instantaneous value is greater than Vtl and is less than Vth, illustrate that input voltage instantaneous value is in predeterminated voltage interval, now to control power switch pipe open-minded for control module 103, as the example of Fig. 2, when input voltage instantaneous value reaches Vtl, switch controlling signal becomes high level, power switch pipe Q1 is open-minded.
It should be noted that, Vtl and Vth can between the 30%-60% of AC-input voltage peak value value, and ensure Vtl<Vth.Such as, when inputting for 220V AC value, input voltage peak value is 310V, then Vtl and Vth can between 93V to 182V value.
According to a specific embodiment of the present invention, inductance computing module 104 specifically for, obtain the first inductor current value and the second inductor current value at default sampling time interval, and calculate inductive current rate of change according to the first inductor current value and the second inductor current value, default sampling time interval.
Particularly, inductance computing module 104 can according to following formulae discovery inductance value:
Wherein, L
estfor inductance value, V
infor input voltage instantaneous value when power switch pipe is opened, I
2be second inductor current value, I
1be first inductor current value, T
rfor default sampling time interval.
Specifically, in power switch pipe Q1 opening process, by current detection module 102, double sampling is carried out to the electric current flowing through inductance L, as the example of Fig. 2, carry out first time sampling to obtain first inductor current value I at sampling instant T1
1, carry out second time sampling to obtain second inductor current value I at sampling instant T2
2.Thus, inductance computing module 104 is at acquisition I
1and I
2after, the difference between sampling instant T2 and employing moment T1 is default sampling time interval T
r, and then inductive current rate of change can be calculated, and input voltage instantaneous value V when opening according to current changing rate and power switch pipe Q1
incalculate inductance value L
est.That is, as shown in Figure 5, at first inductor current value I
1, second inductor current value I
2, preset sampling time interval T
rwith input voltage instantaneous value V
inwhen all known, inductance computing module 104 can according to formulae discovery
the estimated value L of inductance value
est.
Wherein, sampling time interval T is preset
r=T2-T1, T1 and T2 are respectively the sampling instant that power switch pipe Q1 continues in service time T.Preset sampling time interval T
rreasonable setting, in T1 to T2 time interval, need ensure that inductive current has enough large rate of change, guarantees that inductive current can not be excessive again, in order to avoid cause overcurrent fault simultaneously.
Provide T below
r, T1 and T2 exploitation example: suppose that inductance value nominal value is L0=400uH, Vtl is taken as 150V, Vth is taken as 160V, for guaranteeing that total rate of change of inductive current is near dI=10A, and desirable lasting service time T=2*L0*dI/ (Vtl+Vth)=25.8us.In order to ensure the ringing that current sample point is avoided power switch pipe action and caused, desirable T1=10%T, T2=90%T, therefore, T
r=T2-T1=20.6us.
In addition, control module 103 also for when inductance value is less than default inductance value, is protected pfc circuit 20 according to default Preservation tactics.That is; when inductance value is less than default inductance value, illustrate that inductance is in abnormality, control module 103 can take safeguard measure in advance; such as control power factor correction pfc circuit 20 not enable, or utilize communication interface to send the cue etc. of sensibility reciprocal exception.
In addition, it should be noted that, because the inductance detection device busy process of the embodiment of the present invention may cause certain current spike, normally carrying out of power factor correction pfc circuit may be affected, therefore, inductance detection need be carried out before pfc circuit normally works.
In sum, according to the inductance detection device of the pfc circuit that the embodiment of the present invention proposes, the voltage of pfc circuit is input to obtain input voltage instantaneous value by voltage detection module detection, and control module control power switch pipe is open-minded when input voltage instantaneous value is in predeterminated voltage interval, period is opened at power switch pipe, the electric current flowing through inductance is detected by electric six detection modules, inductance computing module is according to the Current calculation inductive current rate of change flowing through inductance detected, and input voltage instantaneous value when opening according to inductive current rate of change and power switch pipe calculates the inductance value of inductance, thus effective detection of inductance parameters can be realized, thus inductance exception can be found in advance and take corresponding safeguard measure.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this instructions or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. an inductance detection method for power factor correction pfc circuit, is characterized in that, described pfc circuit comprises inductance, power switch pipe and diode, and described inductance detection method comprises the following steps:
Detection is input to the voltage of described pfc circuit to obtain input voltage instantaneous value, and it is open-minded to control described power switch pipe when described input voltage instantaneous value is in predeterminated voltage interval;
Open period at described power switch pipe, detect the electric current flowing through described inductance;
According to the Current calculation inductive current rate of change flowing through inductance described in detecting, and input voltage instantaneous value when opening according to described inductive current rate of change and described power switch pipe calculates the inductance value of described inductance.
2. the inductance detection method of power factor correction pfc circuit according to claim 1, is characterized in that, according to the Current calculation inductive current rate of change flowing through inductance described in detecting, specifically comprises:
The first inductor current value and the second inductor current value is obtained at default sampling time interval;
Described inductive current rate of change is calculated according to described first inductor current value and the second inductor current value, described default sampling time interval.
3. the inductance detection method of power factor correction pfc circuit according to claim 3, is characterized in that, inductance value according to following formulae discovery:
Wherein, L
estfor described inductance value, V
infor input voltage instantaneous value when described power switch pipe is opened, I
2for described second inductor current value, I
1for described first inductor current value, T
rfor described default sampling time interval.
4. the inductance detection method of power factor correction pfc circuit according to claim 1, is characterized in that, also comprise:
After described power switch pipe opens Preset Time, control described power switch pipe close.
5. the inductance detection method of the power factor correction pfc circuit according to any one of claim 1-4, is characterized in that, also comprise:
When described inductance value is less than default inductance value, according to default Preservation tactics, described pfc circuit is protected.
6. an inductance detection device for power factor correction pfc circuit, is characterized in that, described pfc circuit comprises inductance, power switch pipe and diode, and described inductance detection device comprises:
Voltage detection module, for detect be input to described pfc circuit voltage to obtain input voltage instantaneous value;
Current detection module, for detecting the electric current flowing through described inductance;
Control module, open-minded for controlling described power switch pipe when described input voltage instantaneous value is in predeterminated voltage interval;
Inductance computing module, the electric current flowing through described inductance is detected by described current detection module for opening period at described power switch pipe, and according to flowing through the Current calculation inductive current rate of change of inductance described in detecting, and input voltage instantaneous value when opening according to described inductive current rate of change and described power switch pipe calculates the inductance value of described inductance.
7. the inductance detection device of power factor correction pfc circuit according to claim 6, is characterized in that, described inductance computing module specifically for,
Obtain the first inductor current value and the second inductor current value at default sampling time interval, and calculate described inductive current rate of change according to described first inductor current value and the second inductor current value, described default sampling time interval.
8. the inductance detection device of power factor correction pfc circuit according to claim 7, is characterized in that, described inductance computing module inductance value according to following formulae discovery:
Wherein, L
estfor described inductance value, V
infor input voltage instantaneous value when described power switch pipe is opened, I
2for described second inductor current value, I
1for described first inductor current value, T
rfor described default sampling time interval.
9. the inductance detection device of power factor correction pfc circuit according to claim 6, is characterized in that, described control module also for, control after described power switch pipe opens Preset Time described power switch pipe close.
10. the inductance detection device of the power factor correction pfc circuit according to any one of claim 6-9; it is characterized in that; described control module also for, when described inductance value is less than default inductance value, according to default Preservation tactics, described pfc circuit is protected.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790616A (en) * | 2016-05-27 | 2016-07-20 | 广东美的制冷设备有限公司 | Power factor correction (PFC) circuit and method and device for identifying electric inductor thereof |
| CN105811791A (en) * | 2016-05-27 | 2016-07-27 | 广东美的制冷设备有限公司 | PFC (power factor correction) circuit and method and device for inductor identification of PFC circuit |
| CN105871235A (en) * | 2016-05-27 | 2016-08-17 | 广东美的制冷设备有限公司 | Power-factor correction (PFC) circuit and inductor identification method and device thereof |
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| CN115754484A (en) * | 2022-11-07 | 2023-03-07 | 上能电气股份有限公司 | Online monitoring method and device for inductance of optical storage system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1338800A (en) * | 2000-08-14 | 2002-03-06 | 诚洲股份有限公司 | Power factor corrector with switching function and its method |
| CN101427451A (en) * | 2006-04-21 | 2009-05-06 | 赤多尼科阿特可两合股份有限公司 | Boost power factor correction circuit (boost PFC) |
| CN103178705A (en) * | 2011-12-26 | 2013-06-26 | 比亚迪股份有限公司 | Method and device for controlling power-factor correction circuit |
| EP2624425A1 (en) * | 2012-01-31 | 2013-08-07 | Whirlpool Corporation | A power supply device for a household appliance and an operating method thereof |
| CN103809007A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | Device and method for inductive current sampling of bridge-free PFC circuit |
-
2015
- 2015-10-26 CN CN201510705587.0A patent/CN105242118B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1338800A (en) * | 2000-08-14 | 2002-03-06 | 诚洲股份有限公司 | Power factor corrector with switching function and its method |
| CN101427451A (en) * | 2006-04-21 | 2009-05-06 | 赤多尼科阿特可两合股份有限公司 | Boost power factor correction circuit (boost PFC) |
| CN103178705A (en) * | 2011-12-26 | 2013-06-26 | 比亚迪股份有限公司 | Method and device for controlling power-factor correction circuit |
| EP2624425A1 (en) * | 2012-01-31 | 2013-08-07 | Whirlpool Corporation | A power supply device for a household appliance and an operating method thereof |
| CN103809007A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | Device and method for inductive current sampling of bridge-free PFC circuit |
Non-Patent Citations (2)
| Title |
|---|
| 严开沁 等: "基于 PFC 变换器的非线性电感的设计研究", 《电工电能新技术》 * |
| 曾敏 等: "变频空调中功率因数校正电感的设计", 《华南理工大学学报 ( 自然科学版 )》 * |
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| CN113156219A (en) * | 2021-05-10 | 2021-07-23 | 郑州大学 | Method and device for monitoring capacitance value and degradation state of output capacitor of Boost PFC converter |
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