CN105006805B - The overcurrent protective device and method of PFC pfc circuit - Google Patents
The overcurrent protective device and method of PFC pfc circuit Download PDFInfo
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- CN105006805B CN105006805B CN201510540227.XA CN201510540227A CN105006805B CN 105006805 B CN105006805 B CN 105006805B CN 201510540227 A CN201510540227 A CN 201510540227A CN 105006805 B CN105006805 B CN 105006805B
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Abstract
The invention discloses a kind of overcurrent protective device of pfc circuit and method, described device includes：First voltage detection module, the input voltage for detecting pfc circuit；Current detection module, the input current for detecting pfc circuit；Second voltage detection module, the output voltage for detecting pfc circuit；Overcurrent protection module generates the first protection signal when input current is less than or equal to default maximum allowed current and input voltage is less than or equal to output voltage；PFC control module calculates dutycycle of the pfc circuit in next switch periods when receiving the first protection signal; and calculating is controlled in the maximum allowable dutycycle of next switch periods, and according to the dutycycle in next switch periods and maximum allowable dutycycle to pfc circuit.The device can be predicted to over current fault in advance, effectively increase the excessively stream response speed of pfc circuit, so as to effectively improve the reliability of pfc circuit.
Description
Technical field
The present invention relates to household electrical appliance technical field, more particularly to a kind of PFC (Power Factor Correction, work(
Rate factor correcting) circuit overcurrent protective device and a kind of over-current protection method of pfc circuit.
Background technology
At present, many white domestic appliances such as convertible frequency air-conditioners, refrigerator etc. with energy-saving effect are required for direct current supply, therefore need
The rectified circuit conversion of single-phase or three-phase alternating current that power network is provided is direct current.And in order to reduce electrical equipment generation
Current harmonics and reactive power, improve the power network quality of power supply, and pfc circuit turns into an essential link.
In home appliance, pfc circuit is usually Boost type pfc circuit, and the circuit mainly includes inductance, recovers two soon
Pole pipe and IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), wherein, IGBT is
The important devices of boost function and power factor emendation function are realized, and IGBT is expensive, in excessively stream or the situation of overvoltage
Under be easily damaged, it is therefore particularly important to IGBT protection.
Generally, the protection to IGBT is broadly divided into hardware protection and software protection.Wherein, hardware protection mainly by than
Compared with circuit, it will be compared by IGBT current flow with current threshold (the maximum allowable current value passed through), if currently
Electric current exceedes current threshold, then comparison circuit output protection signal is to turn off pfc circuit.Software protection is the PFC by sampling
The input current of circuit is compared with the maximum current value set, when the present input current of sampling exceedes maximum current value
When, turn off pfc circuit by setting IGBT conducting dutycycle to be zero.
But the above method has two, one is not distinguish whether electric current flows to pass through IGBT, as long as that is, current input
Electric current exceedes current threshold (maximum current value that generally IGBT is allowed to flow through) with regard to being protected, but actually in pfc circuit
The rated current of other components is not necessarily required to be protected more than the current threshold when IGBT is off state
Shield；Secondly, it is typically just to be protected when the electric current of pfc circuit has met or exceeded current threshold when pfc circuit is opened
Shield, therefore there is necessarily delayed, it is possible to IGBT has occurred and that damage is just protected.Accordingly, it would be desirable to the protection to IGBT
Method is improved.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose that one kind can improve overcurrent protection response speed, and then improve the pfc circuit of pfc circuit reliability
Overcurrent protective device.
It is another object of the present invention to propose a kind of over-current protection method of pfc circuit.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of overcurrent protective device of pfc circuit, bag
Include：First voltage detection module, the first voltage detection module is used for the input voltage for detecting the pfc circuit；Electric current is examined
Module is surveyed, the current detection module is used for the input current for detecting the pfc circuit；Second voltage detection module, described
Two voltage detection modules are used for the output voltage for detecting the pfc circuit；Overcurrent protection module, the overcurrent protection
Module is connected with the first voltage detection module, the current detection module and the second voltage detection module respectively, institute
State overcurrent protection module and be less than or equal to the default maximum allowed current and input voltage is small in the input current
The first protection signal is generated when the output voltage；PFC control module, the PFC control module and the electric current
Overcurrent protection module is connected, and the PFC control module is receiving first guarantor that the overcurrent protection module is sent
Dutycycle of the pfc circuit in next switch periods is calculated during shield signal, and calculates the pfc circuit in next switch
The maximum allowable dutycycle in cycle, and according to the pfc circuit in the dutycycle of next switch periods and described maximum allowable
Dutycycle is controlled to the pfc circuit.
The overcurrent protective device of pfc circuit according to embodiments of the present invention, PFC electricity is detected by first voltage detection module
The input voltage on road, and by the input current of current detection module detection pfc circuit, and pass through second voltage detection module
The output voltage of pfc circuit is detected, overcurrent protection module is less than or equal to default maximum allowed current in input current
And input voltage generates the first protection signal when being less than or equal to output voltage, PFC control module is protected receiving overcurrent
Dutycycle of the pfc circuit in next switch periods is calculated during the first protection signal for protecting module transmission, and calculates pfc circuit under
The maximum allowable dutycycle of one switch periods, and according to pfc circuit is in the dutycycle of next switch periods and maximum allowable accounts for
Sky compares pfc circuit and is controlled.Therefore, the overcurrent protective device of the pfc circuit of the embodiment of the present invention passes through in pfc circuit
Switching tube is predicted in the maximum allowable dutycycle of next switch periods and limited with the dutycycle of switch tube, it is to avoid
Switching tube overcurrent damage, so as to improve the response speed of overcurrent protection, and then improves the reliability of pfc circuit.
According to one embodiment of present invention, the PFC control module calculates the pfc circuit under according to below equation
The dutycycle of one switch periods：
Wherein, Δ IinFor the PFC in the input current of the pfc circuit in current switch period and next switch periods
The difference of the target input current of circuit, d is dutycycle of the pfc circuit in next switch periods, and f is the pfc circuit
Switching frequency, L is PFC inductance values, VinFor the input voltage of the pfc circuit.
According to one embodiment of present invention, the PFC control module calculates described maximum allowable account for according to below equation
Sky ratio：
Wherein, dmaxFor the maximum allowable dutycycle, ImaxFor the default maximum allowed current, min { } is small to take
Value, Δ IcFor default maximum current increment, f is the switching frequency of the pfc circuit, and L is PFC inductance values, VinFor the PFC
The input voltage of circuit, IinFor the input current of the pfc circuit in current switch period.
According to one embodiment of present invention, the PFC control module according to the pfc circuit in next switch periods
When dutycycle and the maximum allowable dutycycle are controlled to the pfc circuit, wherein, when the pfc circuit is opened next
When the dutycycle in pass cycle is more than or equal to the maximum allowable dutycycle, the PFC control module is according to described maximum allowable
Dutycycle is controlled to the switching tube in the pfc circuit；When the pfc circuit is less than in the dutycycle of next switch periods
During the maximum allowable dutycycle, the PFC control module according to the pfc circuit next switch periods dutycycle to institute
The switching tube stated in pfc circuit is controlled.
According to one embodiment of present invention, when the input current is more than the default maximum allowed current or described
When input voltage is more than the output voltage, overcurrent protection module second protection signal of output to the PFC is controlled
Module, so that the dutycycle that the PFC control module is output to the pfc circuit is 0.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of over-current protection method of pfc circuit, bag
Include following steps：The input voltage and input current of the pfc circuit are detected, and detects the output voltage of the pfc circuit；When
The input current is less than or equal to default maximum allowed current and the input voltage is less than or equal to the output voltage
When, overcurrent protection module exports the first protection signal to PFC control module；The PFC control module receive it is described
Duty of the pfc circuit in next switch periods is calculated during first protection signal that overcurrent protection module is sent
Than, and maximum allowable dutycycle of the pfc circuit in next switch periods is calculated, and existed according to the pfc circuit
The dutycycle of next switch periods and the maximum allowable dutycycle are controlled to the pfc circuit.
The input voltage, defeated of the over-current protection method of pfc circuit according to embodiments of the present invention, in real time detection pfc circuit
Enter electric current and output voltage, when input current be less than or equal to default maximum allowed current and input voltage be less than or equal to it is defeated
When going out voltage, overcurrent protection module exports the first protection signal to PFC control module, and PFC control module is receiving electricity
Dutycycle of the pfc circuit in next switch periods is calculated during the first protection signal for flowing overcurrent protection module transmission, and calculates PFC
Circuit next switch periods maximum allowable dutycycle, and according to pfc circuit next switch periods dutycycle and most
It is big to allow dutycycle to be controlled pfc circuit.Therefore, the over-current protection method of the pfc circuit of the embodiment of the present invention passes through right
Switching tube is predicted the dutycycle progress with switch tube in the maximum allowable dutycycle of next switch periods in pfc circuit
Limitation, it is to avoid switching tube overcurrent damage, so as to improve the response speed of overcurrent protection, and then improves the reliable of pfc circuit
Property.
According to one embodiment of present invention, pfc circuit the accounting in next switch periods is calculated according to below equation
Sky ratio：
Wherein, Δ IinFor the PFC in the input current of the pfc circuit in current switch period and next switch periods
The difference of the target input current of circuit, d is dutycycle of the pfc circuit in next switch periods, and f is the pfc circuit
Switching frequency, L is PFC inductance values, VinFor the input voltage of the pfc circuit.
According to one embodiment of present invention, the maximum allowable dutycycle is calculated according to below equation：
Wherein, dmaxFor the maximum allowable dutycycle, ImaxFor the default maximum allowed current, min { } is small to take
Value, Δ IcFor default maximum current increment, f is the switching frequency of the pfc circuit, and L is PFC inductance values, VinFor the PFC
The input voltage of circuit, IinFor the input current of the pfc circuit in current switch period.
According to one embodiment of present invention, the PFC control module according to the pfc circuit in next switch periods
Dutycycle and the maximum allowable dutycycle are controlled to the pfc circuit, are specifically included：When the pfc circuit is next
When the dutycycle of switch periods is more than or equal to the maximum allowable dutycycle, the PFC control module is according to described maximum fair
Perhaps dutycycle is controlled to the switching tube in the pfc circuit；When the pfc circuit is small in the dutycycle of next switch periods
When the maximum allowable dutycycle, the PFC control module according to the pfc circuit next switch periods dutycycle pair
Switching tube in the pfc circuit is controlled.
According to one embodiment of present invention, the over-current protection method of above-mentioned pfc circuit, in addition to：When the input
When electric current is more than the default maximum allowed current or the input voltage more than the output voltage, the overcurrent is protected
Protect module and export the second protection signal to the PFC control module, so that the PFC control module is output to the pfc circuit
Dutycycle be 0.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the overcurrent protective device of pfc circuit according to an embodiment of the invention.
Equivalent circuit diagram when Fig. 2 is switching tube IGBT conductings according to an embodiment of the invention.
Equivalent circuit diagram when Fig. 3 is switching tube IGBT shut-offs according to an embodiment of the invention.
Fig. 4 is defeated in one switch periods when input voltage according to an embodiment of the invention is less than output voltage
Enter the oscillogram of electric current.
Fig. 5 is the current increment signal in the next switch periods of normal condition according to an embodiment of the invention
Figure.
Fig. 6 is the flow chart that pfc circuit according to an embodiment of the invention carries out overcurrent protection.
Fig. 7 is the flow chart of the over-current protection method of pfc circuit according to embodiments of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The overcurrent protective device and PFC of the pfc circuit that propose according to embodiments of the present invention described with reference to the accompanying drawings
The over-current protection method of circuit.
Fig. 1 is the electrical block diagram of the overcurrent protective device of pfc circuit according to an embodiment of the invention.As schemed
Shown in 1, the overcurrent protective device of the pfc circuit includes：First voltage detection module 10, current detection module 20, second voltage
Detection module 30, overcurrent protection module 40 and PFC control module 50.
Wherein, first voltage detection module 10 is used for the input voltage for detecting pfc circuit, and current detection module 20 is used to examine
The input current of pfc circuit is surveyed, second voltage detection module 30 is used for the output voltage for detecting pfc circuit, overcurrent protection
Module 40 is connected with first voltage detection module 10, current detection module 20 and second voltage detection module 30 respectively, electric current mistake
Stream protection module 40 is less than or equal to default maximum allowed current in input current and input voltage is less than or equal to output electricity
The first protection signal is generated during pressure, PFC control module 50 is connected with overcurrent protection module 40, and PFC control module 50 is connecing
Dutycycle of the pfc circuit in next switch periods is calculated during the first protection signal for receiving the transmission of overcurrent protection module 40,
And calculate maximum allowable dutycycle of the pfc circuit in next switch periods, and the accounting in next switch periods according to pfc circuit
Sky with maximum allowable dutycycle to pfc circuit than being controlled.
In an embodiment of the present invention, default maximum allowed current can be allowed the maximum electricity passed through by switching tube
Stream.
Specifically, the Boost type pfc circuit shown in Fig. 1 mainly includes inductance L1, fast recovery diode D, switching tube IGBT
With electrochemical capacitor EC.When switching tube IGBT is in the conduction state, its equivalent circuit is as shown in Fig. 2 the voltage on inductance L1 is
The voltage that AC power is exported after diode rectifier bridge rectification, i.e. first voltage detection module 10 detection pfc circuit it is defeated
Enter voltage Vin.Due to input voltage VinIt is more than zero always, therefore, the electric current for flowing through inductance L1 is gradually increasing, i.e. current detecting mould
The input current I for the pfc circuit that block 20 is detectedinGradually increase；When switching tube IGBT is off state, its equivalent circuit is such as
Shown in Fig. 3, the voltage on inductance L1 is the input voltage V of pfc circuitinWith output voltage VoutDifference.Due to Boost type PFC electricity
Road only has boost function, therefore, under normal operating conditions, the input voltage V of pfc circuitinLess than output voltage Vout, inductance
Voltage reversal on L1, now, flowing through inductance L1 electric current will be gradually reduced, i.e., the input current that current detection module 20 is detected
IinIt is gradually reduced.Therefore, in a switching tube IGBT switch periods, input current IinWaveform as shown in figure 4, when opening
When closing pipe IGBT conductings, input current IinThe rate of rise be tan α=Vin/L；When switching tube IGBT is turned off, input current
IinDescending slope be tan β=(Vout-Vin)/L, wherein, L be PFC inductance values be inductance L1 inductance value.
And it is some in particular cases, for example, when being flown up when AC power such as line voltage is unstable, due to electricity
Solve electric capacity EC presence so that output voltage VoutIt can not immediately rise to stationary value, and be probably after sluggish a period of time in
Stationary value is risen to, therefore, during this period of time, input voltage VinIt is likely to exceed output voltage Vout, now, even if control is opened
Pipe IGBT shut-offs are closed, but due to the voltage (V on inductance L1in-Vout) it is more than zero, the electric current for flowing through inductance L1 still may proceed to rise,
So as to cause over-current phenomenon avoidance.Therefore, in order to avoid over-current phenomenon avoidance occurs, it is necessary to ensure that switching tube IGBT is turned off, to avoid
Input current IinRising is too fast, while in order to ensure to flow through without high current in switching tube IBGT, in an embodiment of the present invention, when
Input voltage VinLess than or equal to output voltage Vout, and input current IinLess than or equal to default maximum allowed current
ImaxWhen i.e. switching tube IGBT allows the maximum current passed through, overcurrent protection module 40 sends the first protection signal to PFC
Control module 50, PFC control module 50 is after the first protection signal of the transmission of overcurrent protection module 40 is received, according to control
Target processed calculates dutycycle of the pfc circuit in next switch periods, while the maximum for calculating pfc circuit in next switch periods permits
Perhaps dutycycle, and according to the dutycycle and maximum allowable dutycycle of next switch periods of calculating to the switching tube in pfc circuit
IGBT is controlled.
According to one embodiment of present invention, PFC control module 50 calculates pfc circuit next according to following formula (1)
The dutycycle of switch periods：
Wherein, Δ IinFor the mesh of the input current and pfc circuit in next switch periods of pfc circuit in current switch period
The difference of input current is marked, d is dutycycle of the pfc circuit in next switch periods, and f is the switching frequency of pfc circuit, and L is PFC electricity
Inductance value, VinFor the input voltage of pfc circuit.
According to one embodiment of present invention, PFC control module 50 calculates maximum allowable duty according to following formula (2)
Than：
Wherein, dmaxFor maximum allowable dutycycle, ImaxFor default maximum allowed current, min { } is gets the small value, Δ IcFor
Default maximum current increment, IinFor the input current of pfc circuit in current switch period.
Specifically, I is worked asin≤ImaxAnd Vin≤VoutWhen, current input current I can be passed throughinAnd Boost type PFC electricity
Whether the current increment in the next switch periods of Predicting Performance Characteristics on road can make input of the pfc circuit in next switch periods
Electric current exceedes maximum allowed current.
Assuming that the pfc circuit that is calculated according to control targe of PFC control module 50 is d in the dutycycle of next switch periods,
The switching frequency of pfc circuit is f, then the input current increment in switching tube IGBT ON times, i.e., in current switch period
In the input current of pfc circuit and next switch periods shown in for example above-mentioned formula (1) of the difference of the target input current of pfc circuit.
In order to prevent the input current increment in a switch periods excessive, maximum current increment can be set as Δ Ic,
Then dutycycle d of the corresponding pfc circuit in next switch periodscAs shown in following formula (3)：
In addition, in order to ensure input current IinNo more than default maximum allowed current Imax, also need according to maximum allowable electricity
Difference (the I of stream and input currentmax-Iin) calculate dutycycle d of the pfc circuit in next switch periodsm, such as following formula (4) institute
Show：
Therefore, in order to ensure current increment of the pfc circuit in next switch periods both be no more than maximum current increment Delta
Ic, also no more than maximum allowed current and the difference (I of input currentmax-Iin), pfc circuit is maximum allowable next switch periods
Dutycycle dmaxThe dutycycle d that above-mentioned formula (2), i.e. pfc circuit need to be met in next switch periods is accounted for no more than maximum allowable
Sky compares dmax.Wherein, under normal operating conditions, in current switch period in the input current of pfc circuit and next switch periods
The difference Δ I of the target input current of pfc circuitin, maximum current increment Delta IcAnd the difference of maximum allowed current and input current
(Imax-Iin) relation between three is as shown in Figure 5.
According to one embodiment of present invention, PFC control module 50 according to pfc circuit next switch periods dutycycle
When being controlled with maximum allowable dutycycle to pfc circuit, wherein, when pfc circuit is more than in the dutycycle of next switch periods
Or during equal to maximum allowable dutycycle, PFC control module 50 is carried out according to maximum allowable dutycycle to the switching tube in pfc circuit
Control；When pfc circuit is less than maximum allowable dutycycle in the dutycycle of next switch periods, PFC control module 50 is according to PFC
Circuit is controlled in the dutycycle of next switch periods to the switching tube in pfc circuit.
That is, as d >=dmaxWhen,PFC control module
50 are controlled according to maximum allowable dutycycle to the switching tube IGBT in pfc circuit；As d ＜ dmaxWhen, according to control targe meter
The dutycycle d in next switch periods calculated keeps constant, and PFC control module 50 is according to pfc circuit in next switch periods
Dutycycle is controlled to the switching tube IGBT in pfc circuit.
According to one embodiment of present invention, when input current is more than default maximum allowed current or input voltage is more than
During output voltage, overcurrent protection module 40 exports the second protection signal to PFC control module 50, so that PFC control module
50 dutycycles for being output to pfc circuit are 0.
Specifically, as shown in figure 1, detecting current input voltage V in real time by first voltage detection module 10in, and lead to
Overcurrent detection module 20 detects current input current I in real timein, and detection is worked as in real time by second voltage detection module 30
Preceding output voltage Vout.The current input current I of 40 pairs of detections of overcurrent protection moduleinWith default maximum allowable electricity
Flow ImaxIt is compared, while to the current input voltage V of detectioninWith output voltage VoutIt is compared.Work as Iin＞ ImaxOr
Person Vin＞ VoutWhen, overcurrent protection module 40 exports the second protection signal to PFC control module 50, and PFC control module 50 exists
Receive after the second protection signal, the dutycycle for controlling the switching tube IGBT in pfc circuit is 0；Work as Iin≤ImaxAnd Vin≤Vout
When, overcurrent protection module 40 exports the first protection signal to PFC control module 50, and PFC control module 50 is receiving the
After one protection signal, dutycycle ds of the switching tube IGBT in next switch periods is calculated according to control targe first, and according to above-mentioned
Formula (2) calculates the maximum allowable dutycycle d of next switch periodsmax, and to the dutycycle d and maximum of next switch periods
Allow dutycycle dmaxIt is compared.As d >=dmaxWhen, d=dmax, PFC control module 50 is according to maximum allowable dutycycle dmaxIt is right
Switching tube IGBT in pfc circuit is controlled；As d ＜ dmaxWhen, the dutycycle d of next switch periods keeps constant, PFC controls
Dutycycle d of the molding block 50 according to pfc circuit in next switch periods is controlled to the switching tube IGBT in pfc circuit.From
And the input voltage V for passing through pfc circuitin, input current IinAnd output voltage VoutCarry out limit switch pipe IGBT dutycycle,
To reach the purpose of prevention switching tube IGBT over-current phenomenon avoidance generations.
Further, as shown in fig. 6, the overcurrent protection process of pfc circuit comprises the following steps：
S101, detects the input current I of pfc circuitin, input voltage Vin, output voltage Vout。
S102, judges whether Iin＞ ImaxOr Vin＞ Vout.If it is, performing step S104；If not, performing step
S103。
S103, calculates switching tube IGBT dutycycle d.
S104, switching tube IGBT dutycycle d=0.
S105, calculates maximum allowable dutycycle
S106, judges whether d >=dmax.If it is, performing step S107；If not, performing step S108.
S107, d=dmax。
S108, d are constant.
The overcurrent protective device of pfc circuit according to embodiments of the present invention, PFC electricity is detected by first voltage detection module
The input voltage on road, and by the input current of current detection module detection pfc circuit, and pass through second voltage detection module
The output voltage of pfc circuit is detected, overcurrent protection module is less than or equal to default maximum allowed current in input current
And input voltage generates the first protection signal when being less than or equal to output voltage, PFC control module is protected receiving overcurrent
Dutycycle of the pfc circuit in next switch periods is calculated during the first protection signal for protecting module transmission, and calculates pfc circuit under
The maximum allowable dutycycle of one switch periods, and according to pfc circuit is in the dutycycle of next switch periods and maximum allowable accounts for
Sky compares pfc circuit and is controlled, so that by the input current, input voltage and output voltage of pfc circuit, and combine PFC
The physical characteristic of circuit comes whether input current of the monitoring switch pipe in next switch periods exceedes maximum allowed current, and
When over-current phenomenon avoidance may occur, the dutycycle of limit switch pipe, so as to limit the rising of input current, is prevented effectively from switching tube
Overcurrent damage, so as to improve the response speed of overcurrent protection, and then improves the reliability of pfc circuit.
Fig. 7 is the flow chart of the over-current protection method of pfc circuit according to embodiments of the present invention.As shown in fig. 7, the PFC
The over-current protection method of circuit comprises the following steps：
S1, detects the input voltage and input current of pfc circuit, and detects the output voltage of pfc circuit.
S2, when input current is less than or equal to default maximum allowed current and input voltage is less than or equal to output voltage
When, overcurrent protection module exports the first protection signal to PFC control module.Wherein, default maximum allowed current can be with
The maximum current for allowing to pass through by switching tube in pfc circuit.
S3, PFC control module calculates pfc circuit when receiving the first protection signal of overcurrent protection module transmission
In the dutycycle of next switch periods, and calculate maximum allowable dutycycle of the pfc circuit in next switch periods, and according to
Pfc circuit is controlled in the dutycycle and maximum allowable dutycycle of next switch periods to pfc circuit.
Specifically, the Boost type pfc circuit shown in Fig. 1 mainly includes inductance, fast recovery diode, switching tube and electrolysis
Electric capacity.When switching tube is in the conduction state, its equivalent circuit is as shown in Fig. 2 voltage on inductance is AC power through two poles
The input voltage V of the pfc circuit of the voltage exported after pipe rectifier bridge rectification, i.e. first voltage detection module detectionin.Due to input
Voltage VinIt is more than zero always, therefore, the electric current for flowing through inductance is gradually increasing, i.e., the pfc circuit of current detection module detection is defeated
Enter electric current IinGradually increase；When switching tube is off state, its equivalent circuit is as shown in figure 3, the voltage on inductance is PFC
The input voltage V of circuitinWith output voltage VoutDifference.Because Boost type pfc circuit only has boost function, therefore, normally
Under working condition, the input voltage V of pfc circuitinLess than output voltage Vout, the voltage reversal on inductance now, flows through inductance
Electric current will be gradually reduced, i.e., current detection module detection input current IinIt is gradually reduced.Therefore, opened at one of switching tube
In the cycle of pass, input current IinWaveform as shown in figure 4, when switching tube is turned on, input current IinThe rate of rise be tan α
=Vin/L；When switching tube is turned off, input current IinDescending slope be tan β=(Vout-Vin)/L, wherein, L is PFC inductance
Value is the inductance value of inductance.
And it is some in particular cases, for example, when being flown up when AC power such as line voltage is unstable, due to electricity
Solve the presence of electric capacity so that output voltage VoutIt can not immediately rise to stationary value, and be probably just to rise after sluggish a period of time
To stationary value, therefore, during this period of time, input voltage VinIt is likely to exceed output voltage Vout, now, even if controlling switch
Pipe is turned off, but due to the voltage (V on inductancein-Vout) it is more than zero, the electric current for flowing through inductance still may proceed to rise, so as to cause
Flow phenomenon occurs.Therefore, in order to avoid over-current phenomenon avoidance occurs, it is necessary to ensure that switching tube is turned off, to avoid input current IinRise
It is too fast, while in order to ensure in switching tube to flow through without high current, in an embodiment of the present invention, as input voltage VinIt is less than or waits
In output voltage Vout, and input current IinLess than or equal to default maximum allowed current ImaxI.e. switching tube allows to pass through
Maximum current when, overcurrent protection module sends the first protection signal to PFC control module, and PFC control module is being received
After the first protection signal sent to overcurrent protection module, pfc circuit is calculated in next switch periods according to control targe
Dutycycle, while calculate maximum allowable dutycycle of the pfc circuit in next switch periods, and according to next switch of calculating week
The dutycycle of phase and maximum allowable dutycycle are controlled to the switching tube in pfc circuit.
According to one embodiment of present invention, duty of the pfc circuit in next switch periods is calculated according to above-mentioned formula (1)
Than.
According to one embodiment of present invention, maximum allowable dutycycle is calculated according to above-mentioned formula (2).
Specifically, I is worked asin≤ImaxAnd Vin≤VoutWhen, current input current I can be passed throughinAnd Boost type PFC electricity
Whether the current increment in the next switch periods of Predicting Performance Characteristics on road can make input of the pfc circuit in next switch periods
Electric current exceedes maximum allowed current.
Assuming that the pfc circuit that is calculated according to control targe of PFC control module is d, PFC in the dutycycle of next switch periods
The switching frequency of circuit is f, then the input current increment in switching tube ON time, i.e. pfc circuit in current switch period
Input current and next switch periods in pfc circuit target input current for example above-mentioned formula (1) of difference shown in.
In order to prevent the input current increment in a switch periods excessive, maximum current increment can be set as Δ Ic,
Then dutycycle d of the corresponding pfc circuit in next switch periodscAs shown in above-mentioned formula (3).In addition, in order to ensure input electricity
Flow IinNo more than default maximum allowed current Imax, also need the difference (I according to maximum allowed current and input currentmax-Iin) come
Calculate dutycycle d of the pfc circuit in next switch periodsm, such as shown in above-mentioned formula (4).
Therefore, in order to ensure current increment of the pfc circuit in next switch periods both be no more than maximum current increment Delta
Ic, also no more than maximum allowed current and the difference (I of input currentmax-Iin), pfc circuit is maximum allowable next switch periods
Dutycycle dmaxThe dutycycle d that above-mentioned formula (2), i.e. pfc circuit need to be met in next switch periods is accounted for no more than maximum allowable
Sky compares dmax.Wherein, under normal operating conditions, in current switch period in the input current of pfc circuit and next switch periods
The difference Δ I of the target input current of pfc circuitin, maximum current increment Delta IcAnd the difference of maximum allowed current and input current
(Imax-Iin) relation between three is as shown in Figure 5.
According to one embodiment of present invention, PFC control module according to pfc circuit next switch periods dutycycle and
Maximum allowable dutycycle is controlled to pfc circuit, is specifically included：When pfc circuit is more than in the dutycycle of next switch periods
Or during equal to maximum allowable dutycycle, PFC control module is controlled according to maximum allowable dutycycle to the switching tube in pfc circuit
System；When pfc circuit is less than maximum allowable dutycycle in the dutycycle of next switch periods, PFC control module is according to pfc circuit
The switching tube in pfc circuit is controlled in the dutycycle of next switch periods.
That is, as d >=dmaxWhen,PFC control module
The switching tube in pfc circuit is controlled according to maximum allowable dutycycle；As d ＜ dmaxWhen, according to control targe calculate
The dutycycle d of next switch periods keeps constant, PFC control module according to pfc circuit next switch periods dutycycle pair
Switching tube in pfc circuit is controlled.
According to one embodiment of present invention, the over-current protection method of above-mentioned pfc circuit also includes：When input current is big
When default maximum allowed current or input voltage are more than output voltage, overcurrent protection module exports the second protection signal
To PFC control module, so that the dutycycle that PFC control module is output to pfc circuit is 0.
Specifically, as shown in figure 1, detecting current input voltage V in real time by first voltage detection modulein, and pass through
Current detection module detects current input current I in real timein, and pass through current defeated of second voltage detection module detection in real time
Go out voltage Vout.Current input current I of the overcurrent protection module to detectioninWith default maximum allowed current ImaxCarry out
Compare, while to the current input voltage V of detectioninWith output voltage VoutIt is compared.Work as Iin＞ ImaxOr Vin＞ Vout
When, overcurrent protection module exports the second protection signal to PFC control module, and PFC control module is receiving the second protection
After signal, the dutycycle for controlling the switching tube in pfc circuit is 0；Work as Iin≤ImaxAnd Vin≤VoutWhen, overcurrent protection mould
Block exports the first protection signal to PFC control module, and PFC control module is after the first protection signal is received, first according to control
Target processed calculates dutycycle d of the switching tube in next switch periods, and calculates next switch periods most according to above-mentioned formula (2)
It is big to allow dutycycle dmax, and dutycycle d and maximum allowable dutycycle d to next switch periodsmaxIt is compared.When d >=
dmaxWhen, d=dmax, PFC control module is according to maximum allowable dutycycle dmaxSwitching tube in pfc circuit is controlled；Work as d
＜ dmaxWhen, the dutycycle d of next switch periods keeps constant, and PFC control module is according to pfc circuit in next switch periods
Dutycycle d is controlled to the switching tube in pfc circuit.So as to pass through the input voltage V of pfc circuitin, input current IinWith
And output voltage VoutCarry out the dutycycle of limit switch pipe, to reach the purpose of prevention switching tube over-current phenomenon avoidance generation.
Further, the overcurrent protection process of pfc circuit as shown in fig. 6, be just not described in detail here.
The input voltage, defeated of the over-current protection method of pfc circuit according to embodiments of the present invention, in real time detection pfc circuit
Enter electric current and output voltage, when input current be less than or equal to default maximum allowed current and input voltage be less than or equal to it is defeated
When going out voltage, overcurrent protection module exports the first protection signal to PFC control module, and PFC control module is receiving electricity
Dutycycle of the pfc circuit in next switch periods is calculated during the first protection signal for flowing overcurrent protection module transmission, and calculates PFC
Circuit next switch periods maximum allowable dutycycle, and according to pfc circuit next switch periods dutycycle and most
It is big to allow dutycycle to be controlled pfc circuit, so that by the input current, input voltage and output voltage of pfc circuit, and
Whether carry out input current of the monitoring switch pipe in next switch periods more than maximum allowable with reference to the physical characteristic of pfc circuit
Electric current, and when over-current phenomenon avoidance may occur, the dutycycle of limit switch pipe, so as to limit the rising of input current, is effectively kept away
Exempt from switching tube overcurrent damage, so as to improve the response speed of overcurrent protection, and then improve the reliability of pfc circuit.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (10)
1. a kind of overcurrent protective device of PFC pfc circuit, including：First voltage detection module, first electricity
Pressure detection module is used for the input voltage for detecting the pfc circuit；Current detection module, the current detection module is used to detect
The input current of the pfc circuit；Second voltage detection module, the second voltage detection module is used to detect the PFC electricity
The output voltage on road；Characterized in that, also including：
Overcurrent protection module, the overcurrent protection module respectively with the first voltage detection module, the electric current
Detection module is connected with the second voltage detection module, and the overcurrent protection module is less than or waited in the input current
The first protection signal is generated when default maximum allowed current and the input voltage are less than or equal to the output voltage；
PFC control module, the PFC control module is connected with the overcurrent protection module, and the PFC control module is connecing
The pfc circuit is calculated in next switch periods during first protection signal for receiving the overcurrent protection module transmission
Dutycycle, and calculate maximum allowable dutycycle of the pfc circuit in next switch periods, and according to the PFC
Circuit is controlled in the dutycycle and the maximum allowable dutycycle of next switch periods to the pfc circuit.
2. the overcurrent protective device of pfc circuit as claimed in claim 1, it is characterised in that the PFC control module according to
Lower formula calculates dutycycle of the pfc circuit in next switch periods：
<mrow>
<msub>
<mi>&Delta;I</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mrow>
<mi>f</mi>
<mi>L</mi>
</mrow>
</mfrac>
<mi>d</mi>
</mrow>
Wherein, Δ IinFor the pfc circuit in the input current of the pfc circuit in current switch period and next switch periods
Target input current difference, d be the pfc circuit next switch periods dutycycle, f be the pfc circuit switch
Frequency, L is PFC inductance values, VinFor the input voltage of the pfc circuit.
3. the overcurrent protective device of pfc circuit as claimed in claim 1 or 2, it is characterised in that the PFC control module root
The maximum allowable dutycycle is calculated according to below equation：
<mrow>
<msub>
<mi>d</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<mo>=</mo>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mo>{</mo>
<mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>I</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>)</mo>
<mi>f</mi>
<mi>L</mi>
</mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
</mfrac>
<mo>,</mo>
<mfrac>
<mrow>
<msub>
<mi>&Delta;I</mi>
<mi>c</mi>
</msub>
<mi>f</mi>
<mi>L</mi>
</mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
</mfrac>
<mo>}</mo>
</mrow>
Wherein, dmaxFor the maximum allowable dutycycle, ImaxFor the default maximum allowed current, min { } is gets the small value, Δ
IcFor default maximum current increment, f is the switching frequency of the pfc circuit, and L is PFC inductance values, VinFor the pfc circuit
Input voltage, IinFor the input current of the pfc circuit in current switch period.
4. the overcurrent protective device of pfc circuit as claimed in claim 1, it is characterised in that the PFC control module is according to institute
Pfc circuit is stated when the dutycycle and the maximum allowable dutycycle of next switch periods are controlled to the pfc circuit, its
In,
When the pfc circuit is more than or equal to the maximum allowable dutycycle in the dutycycle of next switch periods, the PFC
Control module is controlled according to the maximum allowable dutycycle to the switching tube in the pfc circuit；
When the pfc circuit is less than the maximum allowable dutycycle in the dutycycle of next switch periods, the PFC controls mould
Dutycycle of the root tuber according to the pfc circuit in next switch periods is controlled to the switching tube in the pfc circuit.
5. the overcurrent protective device of pfc circuit as claimed in claim 1, it is characterised in that when the input current is more than institute
When stating default maximum allowed current or the input voltage more than the output voltage, the overcurrent protection module output
Second protection signal is to the PFC control module, so that the dutycycle that the PFC control module is output to the pfc circuit is
0。
6. a kind of over-current protection method of PFC pfc circuit, including：Detect the pfc circuit input voltage and
Input current, and detect the output voltage of the pfc circuit；Characterized in that, further comprising the steps of：
When the input current be less than or equal to default maximum allowed current and the input voltage be less than or equal to it is described defeated
When going out voltage, overcurrent protection module exports the first protection signal to PFC control module；
The PFC control module calculates institute when receiving first protection signal that the overcurrent protection module is sent
Dutycycle of the pfc circuit in next switch periods is stated, and calculates the pfc circuit in the maximum allowable of next switch periods
Dutycycle, and according to the pfc circuit next switch periods dutycycle and the maximum allowable dutycycle to the PFC
Circuit is controlled.
7. the over-current protection method of pfc circuit as claimed in claim 6, it is characterised in that according to being calculated below equation
Dutycycle of the pfc circuit in next switch periods：
<mrow>
<msub>
<mi>&Delta;I</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mrow>
<mi>f</mi>
<mi>L</mi>
</mrow>
</mfrac>
<mi>d</mi>
</mrow>
Wherein, Δ IinFor the pfc circuit in the input current of the pfc circuit in current switch period and next switch periods
Target input current difference, d be the pfc circuit next switch periods dutycycle, f be the pfc circuit switch
Frequency, L is PFC inductance values, VinFor the input voltage of the pfc circuit.
8. the over-current protection method of pfc circuit as claimed in claims 6 or 7, it is characterised in that institute is calculated according to below equation
State maximum allowable dutycycle：
<mrow>
<msub>
<mi>d</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<mo>=</mo>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mo>{</mo>
<mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>I</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>)</mo>
<mi>f</mi>
<mi>L</mi>
</mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
</mfrac>
<mo>,</mo>
<mfrac>
<mrow>
<msub>
<mi>&Delta;I</mi>
<mi>c</mi>
</msub>
<mi>f</mi>
<mi>L</mi>
</mrow>
<msub>
<mi>L</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
</mfrac>
<mo>}</mo>
</mrow>
Wherein, dmaxFor the maximum allowable dutycycle, ImaxFor the default maximum allowed current, min { } is gets the small value, Δ
IcFor default maximum current increment, f is the switching frequency of the pfc circuit, and L is PFC inductance values, VinFor the pfc circuit
Input voltage, IinFor the input current of the pfc circuit in current switch period.
9. the over-current protection method of pfc circuit as claimed in claim 6, it is characterised in that the PFC control module is according to institute
The dutycycle and the maximum allowable dutycycle that pfc circuit is stated in next switch periods are controlled to the pfc circuit, specifically
Including：
When the pfc circuit is more than or equal to the maximum allowable dutycycle in the dutycycle of next switch periods, the PFC
Control module is controlled according to the maximum allowable dutycycle to the switching tube in the pfc circuit；
When the pfc circuit is less than the maximum allowable dutycycle in the dutycycle of next switch periods, the PFC controls mould
Dutycycle of the root tuber according to the pfc circuit in next switch periods is controlled to the switching tube in the pfc circuit.
10. the over-current protection method of pfc circuit as claimed in claim 6, it is characterised in that also include：
When the input current is more than the default maximum allowed current or the input voltage is more than the output voltage,
The overcurrent protection module exports the second protection signal to the PFC control module, so that the PFC control module is exported
Dutycycle to the pfc circuit is 0.
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| CN105762767B (en) * | 2016-05-20 | 2018-09-21 | 杭州先途电子有限公司 | Hardware protection circuit based on APFC |
| CN108448883B (en) * | 2018-04-08 | 2020-07-07 | 阳光电源股份有限公司 | Control method of inverter and inverter |
| CN108899893B (en) * | 2018-06-08 | 2021-01-01 | 科华恒盛股份有限公司 | Protection system of energy-feedback traction power supply device and rail transit power supply system |
| CN108923377B (en) * | 2018-08-28 | 2020-01-24 | 海信（山东）空调有限公司 | IGBT (insulated Gate Bipolar transistor) overcurrent protection device and method of PFC (Power factor correction) circuit |
| CN112019015B (en) * | 2019-05-31 | 2021-11-12 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN110445102B (en) * | 2019-08-14 | 2021-11-26 | 上海英恒电子有限公司 | Electronic relay device and protection method |
| CN111600476B (en) * | 2020-06-08 | 2023-11-07 | 深圳威迈斯新能源股份有限公司 | PFC circuit control signal adjusting system and method |
| CN113258760B (en) * | 2021-05-14 | 2022-11-11 | 珠海格力电器股份有限公司 | Circuit control method and device, electronic equipment and storage medium |
| CN114006524B (en) * | 2021-11-05 | 2023-06-27 | 上海儒竞智控技术有限公司 | Method, medium, control circuit and Boost PFC control system for inhibiting overcurrent |
| CN113991995B (en) * | 2021-12-27 | 2022-03-18 | 深圳市永联科技股份有限公司 | Overcurrent protection control method, circuit, switch and storage medium |
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