CN106655101A - Household electrical appliance and over-current protection device and method of power factor corrector - Google Patents
Household electrical appliance and over-current protection device and method of power factor corrector Download PDFInfo
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- CN106655101A CN106655101A CN201610943134.6A CN201610943134A CN106655101A CN 106655101 A CN106655101 A CN 106655101A CN 201610943134 A CN201610943134 A CN 201610943134A CN 106655101 A CN106655101 A CN 106655101A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a household electrical appliance and an over-current protection device and method of a power factor corrector. The device comprises a current sampling circuit, an inductor current detection circuit, a driving unit and a controller; the current sampling circuit samples a current of an inductor to obtain a current sampling value; the inductor current detection circuit obtains a current value of the inductor according to the current sampling value; and the controller is connected with the inductor current detection circuit and the driving unit, and is used to determine whether the current value is greater than an over-current protection threshold of software, and output a first control signal to a driving unit when the current value is greater than the over-current protection threshold of software, so that the driving unit controls a power switch tube in an OFF-state, and the power switch tube is avoided damage caused by over-current.
Description
Technical field
The present invention relates to Alternating Current Power Supply technical field, more particularly to a kind of overcurrent protective device of power factor corrector,
A kind of household electrical appliance with the device and a kind of over-current protection method of power factor corrector.
Background technology
In the equipment or product of single-phase ac power supply, in order to reduce current harmonics, improve power factor, it will usually adopt
With active PFC (Power Factor Correction, PFC) circuit, typical active PFC circuit is Boost
Type pfc circuit, including inductance, diode and the part of power switch pipe three.Single-phase AC voltage Jing after full-bridge rectification, by PFC
Circuit is connected to big capacity electrolyte capacitor and load, and control chip is controlled by detecting the electric current of inductance to power switch pipe,
To realize the regulation of DC voltage on power factor emendation function and electrochemical capacitor.
Wherein, control chip is to power switch pipe when being controlled, when power switch pipe is turned on, electric current of inductance etc.
In the electric current of power switch pipe；When power switch pipe is turned off, the electric current of inductance is equal to the charging and discharging currents of electrochemical capacitor and bears
Carry electric current sum.Because the impact resistance current capacity of inductance and diode is much bigger compared with power switch pipe, thus protection is needed most
Be power switch pipe, to prevent power switch pipe overcurrent damage.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this purpose, the present invention
One purpose is to propose a kind of overcurrent protective device of power factor corrector, and by the current value in inductance software mistake is more than
During stream rotection thresholds, control power switch pipe is off state, and overcurrent damage occurs so as to be prevented effectively from power switch pipe.
Further object is that proposing a kind of household electrical appliance.
A further object of the present invention is to propose a kind of over-current protection method of power factor corrector.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of overcurrent protection dress of power factor corrector
Put, the power factor corrector includes rectifier bridge, pfc circuit and electrochemical capacitor, the pfc circuit includes that inductance, power are opened
Pipe and diode are closed, the overcurrent protective device includes：Current sampling circuit, for the electric current of the inductance is sampled with
Obtain current sampling data；Inductive current detection circuit, the inductive current detection circuit is connected with the current sampling circuit, institute
Inductive current detection circuit is stated for obtaining the current value of the inductance according to the current sampling data；Driver element, the drive
Moving cell is connected with the power switch pipe；Controller, the controller respectively with the inductive current detection circuit and described
Driver element is connected, and whether the controller is used to judge the current value more than software overcurrent protection threshold value, if the electricity
Flow valuve is more than the software overcurrent protection threshold value, then the first control signal is exported to the driver element, with by the driving
Unit controls the power switch pipe and is off state.
The overcurrent protective device of power factor corrector according to embodiments of the present invention, by current sampling circuit to inductance
Electric current sampled to obtain current sampling data, then inductive current detection circuit according to current sampling data obtain inductance electricity
Whether flow valuve, controller judges current value more than software overcurrent protection threshold value, if current value is more than software overcurrent protection threshold value,
The first control signal is then exported to driver element, state is off to control power switch pipe by driver element, so as to have
Effect avoids power switch pipe that overcurrent damage occurs.
According to one embodiment of present invention, the controller is additionally operable to obtain the current value of the inductance more than described soft
The time of part overcurrent protection threshold value and number of times, are designated as respectively the very first time and first number, and whether judge the very first time
More than the first Preset Time, and first number is judged whether more than the first preset times, wherein, if when described first
Between be more than first Preset Time, or first number is more than first preset times, and the controller then exports
Second control signal closes the pfc circuit to the driver element to pass through the driver element.
According to one embodiment of present invention, the overcurrent protective device of above-mentioned power factor corrector, also includes：Hardware
Current foldback circuit, the hardware current foldback circuit is connected respectively with the current sampling circuit and the driver element, institute
Hardware current foldback circuit is stated for the output hardware overcurrent protection when the current sampling data is more than hardware overcurrent protection threshold value
Signal is off state to the driver element to control the power switch pipe by the driver element.
According to one embodiment of present invention, the hardware current foldback circuit is also connected with the controller, the control
Device processed is additionally operable to obtain time and the number of times of the hardware overcurrent protection signal, and the second time and second number are designated as respectively, and
Whether second time is judged more than the second Preset Time, and judge second number whether more than second default time
Number, wherein, if second time is default more than described second more than second Preset Time, or second number
Number of times, the controller then exports the 3rd control signal to the driver element, to close the PFC by the driver element
Circuit.
According to one embodiment of present invention, when the current sampling circuit is arranged on the positive DC side end of the rectifier bridge
Or the power switch pipe drain electrode end when, the current sampling circuit be resistance sampling circuit, transformer, voltage-type Hall
One kind in current sensor and current mode Hall current sensor；When the current sampling circuit is arranged on the power switch
During the output end of the source terminal of pipe, the AC of the rectifier bridge, the input of the inductance or the inductance, the electric current
Sample circuit is sample circuit, transformer, voltage-type Hall current sensor and the electricity being made up of sampling resistor and linear optical coupling
One kind in flow pattern Hall current sensor.
According to one embodiment of present invention, the hardware current foldback circuit includes：Comparison circuit, the comparison circuit
One end be connected with the current sampling circuit, the other end of the comparison circuit respectively with the driver element and the control
Device is connected, and the comparison circuit is used to export the hardware when the current sampling data is more than the hardware overcurrent protection threshold value
Overcurrent protection signal, the comparison circuit includes voltage comparator or hysteresis comparator.
According to another embodiment of the invention, the hardware current foldback circuit also includes：Signal conditioning circuit, it is described
One end of signal conditioning circuit is connected with the current sampling circuit, and the other end of the signal conditioning circuit compares electric with described
The one end on road is connected, and the signal conditioning circuit is used to pre-process the current sampling data, the signal conditioning circuit
For the one kind in RC filter circuits, operational amplification circuit and differential amplifier circuit.
According to still another embodiment of the invention, the hardware current foldback circuit also includes：Signal latch circuit, it is described
One end of signal latch circuit is connected with the other end of the comparison circuit, the other end of the signal latch circuit respectively with institute
State driver element to be connected with the controller, the signal latch circuit is used to lock the hardware overcurrent protection signal
Deposit, the signal latch circuit includes rest-set flip-flop.
According to one embodiment of present invention, the driver element includes that dual input list is exported and logic circuit.
According to one embodiment of present invention, dual input list output and logic circuit be with gate circuit, by NAND gate
With not gate constitute with logic circuit, be made up of two NAND gates with logic circuit, tri-state gate circuit and digital switch chip
In one kind.
For achieving the above object, another aspect of the present invention embodiment proposes a kind of household electrical appliance, and it includes above-mentioned work(
The overcurrent protective device of rate factor corrector.
The household electrical appliance of the embodiment of the present invention, by the overcurrent protective device of above-mentioned power factor corrector, Neng Gou
The current value of inductance is more than software overcurrent protection threshold value, the first control signal of output to driver element, with by driver element control
Power switch pipe processed is off state, so as to be prevented effectively from power switch pipe overcurrent damage, and then ensures household electric appliance operation
Safety and reliability.
For achieving the above object, another aspect of the invention embodiment proposes a kind of overcurrent protection of power factor corrector
Method, the power factor corrector includes rectifier bridge, pfc circuit and electrochemical capacitor, and the pfc circuit includes inductance, power
Switching tube and diode, the over-current protection method is comprised the following steps：The electric current of the inductance is sampled to obtain electricity
Stream sampled value, and the current value of the inductance is obtained according to the current sampling data；Judge the current value whether more than software
Overcurrent protection threshold value；If the current value is more than the software overcurrent protection threshold value, controls the power switch pipe and be in
Off state.
The over-current protection method of power factor corrector according to embodiments of the present invention, adopts first to the electric current of inductance
Whether then sample, according to current sampling data the current value of inductance is obtained to obtain current sampling data, and judge current value more than soft
Part overcurrent protection threshold value, if current value is more than software overcurrent protection threshold value, control power switch pipe is off state, from
And it is prevented effectively from power switch pipe overcurrent damage.
According to one embodiment of present invention, the over-current protection method of above-mentioned power factor corrector, also includes：Obtain
Time and number of times of the current value of the inductance more than the software overcurrent protection threshold value, the very first time and first time are designated as respectively
Number, and whether the very first time is judged more than the first Preset Time, and judge whether first number be pre- more than first
If number of times；If the very first time is more than first Preset Time, or first number is preset more than described first
Number of times, then export the second control signal, and closes the pfc circuit according to second control signal.
Description of the drawings
Fig. 1 a are the power that current sampling circuit according to an embodiment of the invention is arranged on rectifier bridge positive DC side end
The circuit topology figure of factor corrector.
Fig. 1 b are the work(of the drain electrode end that current sampling circuit according to an embodiment of the invention is arranged on power switch pipe
The circuit topology figure of rate factor corrector.
Fig. 1 c are the work(of the source terminal that current sampling circuit according to an embodiment of the invention is arranged on power switch pipe
The circuit topology figure of rate factor corrector.
Fig. 1 d be the AC that current sampling circuit according to an embodiment of the invention is arranged on rectifier bridge power because
The circuit topology figure of number adjuster.
Fig. 1 e are the power factors of the input that current sampling circuit according to an embodiment of the invention is arranged on inductance
The circuit topology figure of adjuster.
Fig. 1 f are the power factors of the output end that current sampling circuit according to an embodiment of the invention is arranged on inductance
The circuit topology figure of adjuster.
Fig. 2 is the circuit diagram of current sampling circuit according to embodiments of the present invention.
Fig. 3 is the structural representation of hardware current foldback circuit according to embodiments of the present invention.
The circuit diagram of comparison circuit Fig. 4 according to embodiments of the present invention.
Fig. 5 is the circuit diagram of signal conditioning circuit according to embodiments of the present invention.
Fig. 6 is the circuit diagram of signal latch circuit according to embodiments of the present invention.
Fig. 7 is the circuit diagram of driver element according to embodiments of the present invention.
Fig. 8 is the flow chart of the over-current protection method of power factor corrector according to embodiments of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
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.
With reference to the accompanying drawings to describe the overcurrent protective device of the power factor corrector of the embodiment of the present invention, with the mistake
The household electrical appliance of stream protection device and the over-current protection method of power factor corrector.
In an embodiment of the present invention, power factor corrector includes rectifier bridge 100, pfc circuit and electrochemical capacitor EC, its
In, pfc circuit includes inductance L, power switch pipe Q and diode D.
Specifically, as shown in Fig. 1 a- Fig. 1 f, the AC of rectifier bridge 100 is connected with AC power AC, and inductance L's is defeated
Enter end to be connected with the DC side anode of rectifier bridge 100, the output end of inductance L source terminal respectively with power switch pipe Q and two poles
The anode of pipe D is connected, and the negative electrode of diode D is connected with one end of electrochemical capacitor EC, the drain electrode end of power switch pipe Q respectively with it is whole
The positive DC side end of stream bridge 100 is connected with the other end of electrochemical capacitor EC.
As shown in Fig. 1 a- Fig. 1 f, the overcurrent protective device of power factor corrector may include current sampling circuit 310, electricity
Electrification current detection circuit 320, driver element 330 and controller 340.
Wherein, current sampling circuit 310 is used to that the electric current of inductance L to be sampled to obtain current sampling data.Inductance electricity
Current detection circuit 320 is connected with current sampling circuit 310, and inductive current detection circuit 320 is used to be obtained according to current sampling data
The current value of inductance L.Controller 340 is connected respectively with inductive current detection circuit 320 and driver element 330, driver element 330
It is connected with power switch pipe Q, whether controller 340 is used to judge current value more than software overcurrent protection threshold value, if current value
More than software overcurrent protection threshold value, then the first control signal is exported to driver element 330, to control work(by driver element 330
Rate switching tube Q is off state.Wherein, current threshold of the software overcurrent protection threshold value less than power switch pipe Q.
Specifically, in actual applications, the set location of current sampling circuit 310 has various, as shown in Figure 1a, electric current
Sample circuit 310 may be provided at the positive DC side end of rectifier bridge 100；As shown in Figure 1 b, current sampling circuit 310 may be provided at work(
The drain electrode end of rate switching tube Q；As illustrated in figure 1 c, current sampling circuit 310 may be provided at the source terminal of power switch pipe Q；As schemed
Shown in 1d, current sampling circuit 310 may be provided at the AC of rectifier bridge 100；As shown in fig. le, current sampling circuit 310 can
It is arranged on the input of inductance L；As shown in Figure 1 f, current sampling circuit 310 may be provided at the output end of inductance L.
Further, the implementation of current sampling circuit 310 also has various, as shown in Figure 2 a, resistance can be used directly
Carry out current sample；As shown in Figure 2 b, isolation transmission can be entered using resistance sampling and by linear optical coupling；As shown in Figure 2 c, may be used
Current sample is carried out using transformer；As shown in Figure 2 d, current sample can be carried out using voltage-type Hall current sensor；As schemed
Shown in 2e, current sample can be carried out using current mode Hall current sensor.
, wherein it is desired to explanation, when current sampling circuit 310 is arranged according to the position shown in Fig. 1 c- Fig. 1 f, needs
Using isolation sample mode, i.e. need using the sample mode shown in similar Fig. 2 b- Fig. 2 e.Say, in embodiments of the invention
In, when current sampling circuit 310 is arranged on the drain electrode end of the positive DC side end of rectifier bridge 100 or power switch pipe Q, electric current
Sample circuit 310 is resistance sampling circuit (including Fig. 2 a and Fig. 2 b), transformer, voltage-type Hall current sensor and current mode
One kind in Hall current sensor；When current sampling circuit 310 is arranged on the source terminal of power switch pipe Q, rectifier bridge 100
During the output end of AC, the input of inductance L or inductance L, current sampling circuit 310 is by sampling resistor and linear optical coupling
One kind in the sample circuit of composition, transformer, voltage-type Hall current sensor and current mode Hall current sensor.
As shown in Fig. 1 a- Fig. 1 f, when power factor corrector works on power, 310 pairs of electricity of current sampling circuit can be passed through
The electric current of sense L is sampled, and obtains the current value of inductance L in real time by inductive current detection circuit 320, and by direct current
The voltage at the real-time detection inductance capacitance EC two ends of voltage detecting circuit 400, i.e. DC bus-bar voltage.Then, the basis of controller 340
The current value and DC bus-bar voltage of inductance L, by PFC algorithm output pwm signal to driver element 330, drives
Unit 330 carries out switch control rule according to pwm signal to power switch pipe Q, to realize power factor emendation function and female to direct current
The regulation of line voltage.
In the process, controller 340 also judged the current value of inductance L, when the current value of inductance L is more than software
During overcurrent protection threshold value, controller 340 stops output pwm signal, and exports the first control signal (such as low level signal) to drive
Moving cell 330, is off state, so as to realize to power switch pipe to control power switch pipe Q by driver element 330
In time protection, is prevented effectively from when the current value of inductance is excessive, and it is in the conduction state now still to control power switch pipe so that stream
The electric current of overpower switching tube is excessive and cause power switch pipe that overcurrent damage occurs.After the Q shut-offs of control power switch pipe, such as
Fruit detects the current value of inductance L less than or equal to software overcurrent protection threshold value, then be further continued for the current value and direct current according to inductance L
Busbar voltage carries out PWM controls to power switch pipe Q.
Therefore, the overcurrent protective device of power factor corrector according to embodiments of the present invention, when the current value of inductance it is big
When software overcurrent protection threshold value, directly control power switch pipe is off state, so as to be realized to work(using software mode
The timely protection of rate switching tube, is prevented effectively from power switch pipe overcurrent damage.
Further, according to one embodiment of present invention, controller 340 be additionally operable to obtain inductance L current value be more than
The time of software overcurrent protection threshold value and number of times, are designated as respectively the very first time and first number, and judge whether the very first time is big
In the first Preset Time, and judge first number whether more than the first preset times.If the very first time is default more than first
Time, or first number be more than the first preset times, controller 340 then exports the second control signal to driver element 330, with
Pfc circuit is closed by driver element 330.Wherein, the first Preset Time and the first preset times can be according to the friendships of practical application
The abnormal disturbed condition of stream power supply AC is set.
Specifically, as shown in Fig. 1 a- Fig. 1 f, when the current value for detecting inductance L is more than software overcurrent protection threshold value,
Controller 340 stops output pwm signal, and exports the first control signal to driver element 330, to be controlled by driver element 330
Power switch pipe Q shut-offs processed, meanwhile, controller 340 is more than software overcurrent protection threshold value yet further still according to the current value of inductance L
Time and the frequency judge whether to need to close pfc circuit.Wherein, close pfc circuit and refer to persistently output switch-off power switch
The control signal of pipe Q so that power switch pipe Q is constantly in off state, now cannot realize power factor emendation function and
The regulation of DC bus-bar voltage.For example, when there is one to reach condition set in advance in time and the frequency, controller 340 will
The second control signal (such as persistently low level signal) is exported to driver element 330, to control power switch by driver element 330
Pipe Q is constantly in off state, so as to be prevented effectively from AC power unusual fluctuations in the case of, the situation that pfc circuit is closed by mistake, together
When can be prevented effectively from long-time and cross high frequency time the excessively stream of power switch pipe is impacted.
Therefore, the overcurrent protective device of power factor corrector according to embodiments of the present invention, when the current value of inductance it is big
When software overcurrent protection threshold value, control power switch pipe shut-off, so as to realize the timely protection to power switch pipe, also,
When the current value of inductance is more than the time of software overcurrent protection threshold value or the frequency meets pre-conditioned, control pfc circuit is closed,
So as to be prevented effectively from because the extremely caused pfc circuit of AC power is closed by mistake, the problem that pfc circuit function is lost, while can have
Effect avoids long-time and crosses excessively stream impact of the high frequency time to power switch pipe.
It is understood that in the above-described embodiments, the overcurrent protection of power switch pipe mainly adopts software mode reality
It is existing, and in other embodiments of the invention, can also adopt hardware circuit to realize the overcurrent protection to power switch pipe.
According to one embodiment of present invention, as shown in Fig. 1 a- Fig. 1 f, the overcurrent protection of above-mentioned power factor corrector
Device may also include：Hardware current foldback circuit 350, hardware current foldback circuit 350 respectively with current sampling circuit 310 and drive
Moving cell 330 is connected.It is hard that hardware current foldback circuit 350 is used for the output when current sampling data is more than hardware overcurrent protection threshold value
Part overcurrent protection signal is off state to driver element 330 to control power switch pipe Q by driver element 330.Its
In, hardware overcurrent protection threshold value is more than software overcurrent protection threshold value and less than the current threshold of power switch pipe Q.
Specifically, the overcurrent protection of power switch pipe Q can be realized only with hardware mode.For example, in controller 340
During carrying out PWM controls to power switch pipe Q according to the current value and DC bus-bar voltage of inductance L, when current sample electricity
When the current sampling data that road 310 collects is more than hardware overcurrent protection threshold value, hardware current foldback circuit 350 is by output hardware mistake
To driver element 330, now tube controller 340 is not exported to the PWM of driver element 330 stream protection signal (such as low level signal)
Signal is high level or low level, and driver element 330 all will be closed according to hardware overcurrent protection signal control power switch pipe Q
It is disconnected, to be protected in time to power switch pipe, it is prevented effectively from power switch pipe overcurrent damage.
Alternatively, it is also possible to realize the overcurrent protection to power switch pipe Q by the way of combining using soft or hard.As the present invention's
One specific example, PWM controls are carried out in controller 340 according to the current value and DC bus-bar voltage of inductance L to power switch pipe Q
During system, whether controller 340 also judges the current value of inductance L more than software overcurrent protection threshold value, and in the electricity of inductance L
Flow valuve exports the first control signal to driver element 330 when being more than software protection threshold value, meanwhile, hardware current foldback circuit 350
Output hardware overcurrent protection signal is to driver element also when the current sampling data for collecting is more than hardware overcurrent protection threshold value
330.When driver element 330 receives the either signal in the first control signal and hardware overcurrent protection signal, driver element
330 all turn off control power switch pipe Q, to be protected in time to power switch pipe.
Further, as another specific example of the present invention, in controller 340 according to the current value and direct current of inductance L
During busbar voltage carries out PWM controls to power switch pipe Q, controller 340 also judges whether the current value of inductance L is more than
Software overcurrent protection threshold value, and the first control signal is exported when the current value of inductance L is more than software protection threshold value to driving list
Unit 330, and controller 340 also determines whether time and the frequency of the current value of inductance L more than software overcurrent protection threshold value
Whether reach pre-conditioned, and when having one to reach condition set in advance in time and the frequency, export the second control signal
To driver element 330.Meanwhile, hardware current foldback circuit 350 is also more than hardware overcurrent protection in the current sampling data for collecting
Output hardware overcurrent protection signal is to driver element 330 during threshold value.When driver element 330 receives the first control signal and hardware
During either signal in overcurrent protection signal, driver element 330 will control power switch pipe Q shut-offs, to enter to power switch pipe
Row protection in time, and when driver element 330 receives the second control signal, the control power switch pipe of driver element 330 Q mono-
Directly it is closed, to close pfc circuit.So as to realize the multiple protective to power switch pipe so that power switch pipe energy
Access more effective, more reliable protection.
That is, when by the way of being combined using soft or hard, only in hardware current foldback circuit 330 and controller 340
During the signal of output control power switch pipe Q conductings simultaneously, driver element 330 can just control power switch pipe Q conductings, otherwise,
Control power switch pipe Q is off state.
Further it will be understood that because hardware current foldback circuit 350 is realized to power switch by hardware mode
The overcurrent protection of pipe Q, therefore, hardware current foldback circuit 350 can be hardware comparison circuit.
According to one embodiment of present invention, as shown in Figure 3 a, hardware current foldback circuit 350 may include comparison circuit
351, one end of comparison circuit 351 is connected with current sampling circuit 310, the other end of comparison circuit 351 respectively with driver element
330 are connected with controller 340, and comparison circuit 351 is used for the output hardware when current sampling data is more than hardware overcurrent protection threshold value
Overcurrent protection signal.Further, as shown in figure 4, comparison circuit 351 may include that voltage comparator or hysteresis comparator are (stagnant
Ring comparator).
According to another embodiment of the invention, as shown in Figure 3 b, hardware current foldback circuit 350 may also include signal tune
Reason circuit 352, one end of signal conditioning circuit 352 is connected with current sampling circuit 310, the other end of signal conditioning circuit 352
It is connected with one end of comparison circuit 351, signal conditioning circuit 352 is used to pre-process current sampling data, for example, to electric current
Sampled value is filtered process or amplifies.Further, as shown in figure 5, signal conditioning circuit 352 can be RC filtered electricals
One kind in road, operational amplification circuit and differential amplifier circuit.
According to still another embodiment of the invention, as shown in Figure 3 c, hardware current foldback circuit 350 may also include signal lock
Deposit circuit 353, one end of signal latch circuit 353 is connected with the other end of comparison circuit 351, signal latch circuit 353 it is another
One end is connected respectively with driver element 330 and controller 340, and signal latch circuit 353 is used to enter hardware overcurrent protection signal
Row is latched.Further, as shown in fig. 6, signal latch circuit 353 may include rest-set flip-flop, for example, rest-set flip-flop can be RS
Trigger chip or the rest-set flip-flop being made up of NAND gate.
It is understood that hardware current foldback circuit 350 can also adopt other implementations, specifically do not limit here
System.
Therefore, the overcurrent protective device of power factor corrector according to embodiments of the present invention, can not only pass through software
Mode realizes the timely protection to power switch pipe, and hardware mode can be adopted to realize the timely protection to power switch pipe,
When two ways is adopted simultaneously, the multiple protective to power switch pipe is capable of achieving so that power switch pipe can more be had
Effect, more reliable protection.
Further, according to one embodiment of present invention, as shown in Fig. 1 a- Fig. 1 f, hardware current foldback circuit 350 is also
It is connected with controller 340, controller 340 is additionally operable to obtain time and the number of times of hardware overcurrent protection signal, and second is designated as respectively
Time and second number, and judged for the second time whether more than the second Preset Time, and judge whether second number is more than the
Two preset times.If the second time was more than the second Preset Time, or second number is more than the second preset times, controller
340 the 3rd control signals of output close pfc circuit to driver element 330 to pass through driver element 330.
Specifically, in controller 340 power switch pipe Q is carried out according to the current value and DC bus-bar voltage of inductance L
During PWM is controlled, if hardware current foldback circuit 350 detects current sampling data more than hardware overcurrent protection threshold value,
Hardware current foldback circuit 350 is by output hardware overcurrent protection signal to driver element 330 and controller 340, driver element 330
Power switch pipe Q shut-offs will be controlled according to hardware overcurrent protection signal, meanwhile, controller 340 is further protected according to hardware excessively stream
The time of shield signal and the frequency judge whether to need to close pfc circuit.If in the time and the frequency of hardware overcurrent protection signal
There is one to reach condition set in advance, controller 340 then exports the 3rd control signal (such as persistently low level signal) to driving
Unit 330, is constantly in off state, so as to be prevented effectively from AC power to control power switch pipe Q by driver element 330
In the case of unusual fluctuations, the situation that pfc circuit is closed by mistake, while long-time can be prevented effectively from and high frequency time is crossed to power switch pipe
Excessively stream impact.
Further, in another specific example of the present invention, whether controller 340 also detects that the current value of inductance L
During more than software overcurrent protection threshold value, if it does, controller 340 then exports the first control signal to driver element 330.Work as drive
When moving cell 330 receives the either signal in the first control signal and hardware overcurrent protection signal, driver element 330 will be controlled
Power switch pipe Q is turned off, to be protected in time to power switch pipe, and when driver element 330 receives the 3rd control letter
Number when, driver element 330 control power switch pipe Q be constantly in closed mode, to close pfc circuit.So as to realize to power
The multiple protective of switching tube so that power switch pipe can obtain more effective, more reliable protection.
Yet further, in the another specific example of the present invention, electric current of the controller 340 yet further still according to inductance L
Value is more than the time of software overcurrent protection threshold value and the frequency judges whether to need to close pfc circuit, if it is desired, controller 340
The second control signal will be exported to driver element 330.When driver element 330 receives the first control signal and hardware overcurrent protection
During either signal in signal, driver element 330 will control power switch pipe Q shut-offs, to be protected in time to power switch pipe
Shield, and when driver element 330 receives the either signal in the second control signal and the 3rd control signal, driver element
330 control power switch pipe Q are constantly in closed mode, to close pfc circuit.So as to realize the multiple guarantor to power switch pipe
Shield so that power switch pipe can obtain more effective, more reliable protection.
That is, the overcurrent protective device of the power factor corrector of the embodiment of the present invention is capable of achieving to power switch pipe
Four kinds protection, including：When current value be more than software overcurrent protection threshold value when, controller 340 export the first control signal so that
Power switch pipe Q is turned off；When current value is more than software overcurrent protection threshold value, and current value more than software overcurrent protection threshold value
When time or the frequency meet pre-conditioned, controller 340 exports the second control signal so that power switch pipe Q is constantly in shut-off
State；When current sampling data is more than hardware overcurrent protection threshold value, the output hardware overcurrent protection of hardware current foldback circuit 350 letter
Number so that power switch pipe Q shut-off；When current sampling data is more than hardware overcurrent protection threshold value, and current sampling data is more than hardware
When the time of overcurrent protection threshold value or the frequency meet pre-conditioned, controller 340 exports the 3rd control signal so that power switch
Pipe Q is constantly in off state.The protected mode for specifically being adopted can be any combination of these four protections.
In addition, it is necessary to explanation, in order to prevent the conflict between control signal, only when hardware overcurrent protection signal and
The control signal of the output of controller 340 requires to open power switch pipe Q simultaneously when, driver element 330 is just exported to be opened power and opens
Close the drive signal of pipe Q；Otherwise, the drive signal of switch-off power switching tube Q is exported.Wherein, driver element 330 can be adopted and patrolled
Collect to realize.
According to one embodiment of present invention, driver element 330 may include that dual input list is exported and logic circuit.Such as Fig. 7
It is shown, dual input list output with logic circuit can be with gate circuit, be made up of NAND gate and not gate with logic circuit, by two
Individual NAND gate constitute with logic circuit, tri-state gate circuit and digital switch chip in one kind.
In sum, the overcurrent protective device of power factor corrector according to embodiments of the present invention, can realize to work(
Timely protection on the software and hardware of rate switching tube, it is to avoid power switch pipe occurs overcurrent damage, and AC power is avoided that again
The pfc circuit that causes when exception is closed by mistake, affects the problem of systematic function, while and can avoid long-time and high frequency time
The excessively stream of power switch pipe is impacted.
In addition, embodiments of the invention also proposed a kind of household electrical appliance, it includes above-mentioned power factor corrector
Overcurrent protective device.
Household electrical appliance according to embodiments of the present invention, by the overcurrent protective device of above-mentioned power factor corrector, energy
Power switch pipe overcurrent damage is enough prevented effectively from, and then ensures the safety and reliability of household electric appliance operation.
Fig. 8 is the flow chart of the over-current protection method of power factor corrector according to embodiments of the present invention.In the present invention
Embodiment in, power factor corrector include rectifier bridge, pfc circuit and electrochemical capacitor, wherein, pfc circuit include inductance, work(
Rate switching tube and diode.
As shown in figure 8, the over-current protection method of the power factor corrector may include following steps：
S1, is sampled to obtain current sampling data to the electric current of inductance, and obtains the electricity of inductance according to current sampling data
Flow valuve.
Whether S2, judge current value more than software overcurrent protection threshold value.
S3, if current value is more than software overcurrent protection threshold value, control power switch pipe is off state.
Therefore, the over-current protection method of power factor corrector according to embodiments of the present invention, when the current value of inductance it is big
When software overcurrent protection threshold value, directly control power switch pipe is off state, so as to realize to power switch pipe and
When protect, be prevented effectively from power switch pipe overcurrent damage.
According to one embodiment of present invention, the over-current protection method of above-mentioned power factor corrector also includes：Obtain
Time and number of times of the current value of inductance more than software overcurrent protection threshold value, the very first time and first number are designated as respectively, and sentence
Whether whether the disconnected very first time is more than the first Preset Time, and judge first number more than the first preset times；If first
Time is more than the first Preset Time, or first number is more than the first preset times, then export the second control signal, and according to the
Two control signals close pfc circuit.
Therefore, the over-current protection method of power factor corrector according to embodiments of the present invention, when the current value of inductance it is big
When software overcurrent protection threshold value, control power switch pipe shut-off, so as to realize the timely protection to power switch pipe, meanwhile,
When the current value of inductance is more than the time of software overcurrent protection threshold value or the frequency meets pre-conditioned, control pfc circuit is closed,
So as to be prevented effectively from because the extremely caused pfc circuit of AC power is closed by mistake, the problem that pfc circuit function is lost, while can have
Effect avoids long-time and crosses excessively stream impact of the high frequency time to power switch pipe.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " 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 indicates or imply that the device or element of indication must
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, 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 describing the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
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 it is integral；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, 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 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.And, the specific features of description, structure, material or feature can be with office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
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, changes, replacing and modification.
Claims (13)
1. a kind of overcurrent protective device of power factor corrector, it is characterised in that the power factor corrector includes rectification
Bridge, pfc circuit and electrochemical capacitor, the pfc circuit includes inductance, power switch pipe and diode, the overcurrent protective device
Including：
Current sampling circuit, for being sampled to obtain current sampling data to the electric current of the inductance；
Inductive current detection circuit, the inductive current detection circuit is connected with the current sampling circuit, the inductive current
Detection circuit is used to obtain the current value of the inductance according to the current sampling data；
Driver element, the driver element is connected with the power switch pipe；
Controller, the controller is connected respectively with the inductive current detection circuit and the driver element, the controller
For whether judging the current value more than software overcurrent protection threshold value, if the current value is more than the software overcurrent protection
Threshold value, then export the first control signal to the driver element, to control at the power switch pipe by the driver element
In off state.
2. the overcurrent protective device of power factor corrector as claimed in claim 1, it is characterised in that the controller is also used
In time and number of times of the current value of the inductance more than the software overcurrent protection threshold value is obtained, be designated as respectively the very first time and
First number, and whether the very first time is judged more than the first Preset Time, and judge whether first number is more than
First preset times, wherein,
If the very first time is more than first Preset Time, or first number more than described first default time
Number, the controller then exports the second control signal to the driver element, electric to close the PFC by the driver element
Road.
3. the overcurrent protective device of power factor corrector as claimed in claim 1 or 2, it is characterised in that also include：
Hardware current foldback circuit, the hardware current foldback circuit respectively with the current sampling circuit and the driver element
It is connected, the hardware current foldback circuit is used for the output hardware mistake when the current sampling data is more than hardware overcurrent protection threshold value
Stream protection signal is off state to the driver element to control the power switch pipe by the driver element.
4. the overcurrent protective device of power factor corrector as claimed in claim 3, it is characterised in that the hardware excessively stream is protected
Protection circuit is also connected with the controller, the controller be additionally operable to obtain the time of the hardware overcurrent protection signal and time
Number, is designated as respectively the second time and second number, and whether judges second time more than the second Preset Time, and judges
Whether second number is more than the second preset times, wherein,
If second time is more than second Preset Time, or second number more than described second default time
Number, the controller then exports the 3rd control signal to the driver element, electric to close the PFC by the driver element
Road.
5. the overcurrent protective device of power factor corrector as claimed in claim 1, it is characterised in that
When the current sampling circuit is arranged on the drain electrode end of the positive DC side end of the rectifier bridge or the power switch pipe
When, the current sampling circuit is resistance sampling circuit, transformer, voltage-type Hall current sensor and current mode Hall current
One kind in sensor；
When the current sampling circuit is arranged on source terminal, the AC of the rectifier bridge, the electricity of the power switch pipe
During the output end of the input of sense or the inductance, the current sampling circuit is made up of sampling resistor and linear optical coupling
One kind in sample circuit, transformer, voltage-type Hall current sensor and current mode Hall current sensor.
6. the overcurrent protective device of power factor corrector as claimed in claim 3, it is characterised in that the hardware excessively stream is protected
Protection circuit includes：
Comparison circuit, one end of the comparison circuit is connected with the current sampling circuit, the other end point of the comparison circuit
It is not connected with the driver element and the controller, the comparison circuit is used to be more than the hardware in the current sampling data
The hardware overcurrent protection signal is exported during overcurrent protection threshold value, the comparison circuit includes that voltage comparator or sluggishness compare
Device.
7. the overcurrent protective device of power factor corrector as claimed in claim 6, it is characterised in that the hardware excessively stream is protected
Protection circuit also includes：
Signal conditioning circuit, one end of the signal conditioning circuit is connected with the current sampling circuit, the signal condition electricity
The other end on road is connected with one end of the comparison circuit, and the signal conditioning circuit is pre- for carrying out to the current sampling data
Process, the signal conditioning circuit is the one kind in RC filter circuits, operational amplification circuit and differential amplifier circuit.
8. the overcurrent protective device of power factor corrector as claimed in claim 7, it is characterised in that the hardware excessively stream is protected
Protection circuit also includes：
Signal latch circuit, one end of the signal latch circuit is connected with the other end of the comparison circuit, the signal lock
The other end for depositing circuit is connected respectively with the driver element and the controller, and the signal latch circuit is used for described hard
Part overcurrent protection signal is latched, and the signal latch circuit includes rest-set flip-flop.
9. the overcurrent protective device of power factor corrector as claimed in claim 1, it is characterised in that the driver element bag
Include the output of dual input list and logic circuit.
10. the overcurrent protective device of power factor corrector as claimed in claim 11, it is characterised in that the dual input list
Output with logic circuit be with gate circuit, be made up of NAND gate and not gate with logic circuit, be made up of two NAND gates with
One kind in logic circuit, tri-state gate circuit and digital switch chip.
11. a kind of household electrical appliance, it is characterised in that include the power factor corrector as any one of claim 1-10
Overcurrent protective device.
12. a kind of over-current protection methods of power factor corrector, it is characterised in that the power factor corrector includes rectification
Bridge, pfc circuit and electrochemical capacitor, the pfc circuit includes inductance, power switch pipe and diode, the over-current protection method
Comprise the following steps：
The electric current of the inductance is sampled to obtain current sampling data, and the inductance is obtained according to the current sampling data
Current value；
Judge the current value whether more than software overcurrent protection threshold value；
If the current value is more than the software overcurrent protection threshold value, controls the power switch pipe and be off state.
The over-current protection method of 13. power factor correctors as claimed in claim 12, it is characterised in that also include：
Time and number of times of the current value of the inductance more than the software overcurrent protection threshold value is obtained, the very first time is designated as respectively
With first number, and the very first time is judged whether more than the first Preset Time, and judge whether first number be big
In the first preset times；
If the very first time is more than first Preset Time, or first number more than described first default time
Number, then export the second control signal, and closes the pfc circuit according to second control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610943134.6A CN106655101A (en) | 2016-10-31 | 2016-10-31 | Household electrical appliance and over-current protection device and method of power factor corrector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610943134.6A CN106655101A (en) | 2016-10-31 | 2016-10-31 | Household electrical appliance and over-current protection device and method of power factor corrector |
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| CN106655101A true CN106655101A (en) | 2017-05-10 |
Family
ID=58821258
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| CN201610943134.6A Pending CN106655101A (en) | 2016-10-31 | 2016-10-31 | Household electrical appliance and over-current protection device and method of power factor corrector |
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| CN108896899A (en) * | 2018-07-23 | 2018-11-27 | 广东志高暖通设备股份有限公司 | A kind of integrated switch pipe over-current detection circuit |
| CN109525107A (en) * | 2018-12-29 | 2019-03-26 | 浙江鲲悟科技有限公司 | A kind of PFC control and protection circuit |
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| CN112736852A (en) * | 2020-12-29 | 2021-04-30 | 联合汽车电子有限公司 | Overcurrent detection protection circuit |
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| CN114006524A (en) * | 2021-11-05 | 2022-02-01 | 上海儒竞智控技术有限公司 | Method, medium and control circuit for realizing over-current suppression and Boost type PFC control system |
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Application publication date: 20170510 |