CN206225996U - The overcurrent protective device and household electrical appliance of power factor corrector - Google Patents

The overcurrent protective device and household electrical appliance of power factor corrector Download PDF

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Publication number
CN206225996U
CN206225996U CN201621165034.7U CN201621165034U CN206225996U CN 206225996 U CN206225996 U CN 206225996U CN 201621165034 U CN201621165034 U CN 201621165034U CN 206225996 U CN206225996 U CN 206225996U
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circuit
current
hardware
driver
power switch
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黄招彬
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea Refrigeration Equipment Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The utility model discloses the overcurrent protective device and household electrical appliance of a kind of power factor corrector, the overcurrent protective device includes:Current sampling circuit, is used to sample to obtain current sampling data the electric current of inductance, wherein, current sampling circuit is arranged on the positive DC side end of rectifier bridge or the drain electrode end of power switch pipe;Driver element, driver element is connected with power switch pipe;Hardware current foldback circuit; hardware current foldback circuit is connected with current sampling circuit and driver element respectively; hardware current foldback circuit is to the output hardware overcurrent protection signal when current sampling data is more than hardware overcurrent protection threshold value to driver element; control power switch pipe to be off state with by driver element, overcurrent damage occurs so as to be prevented effectively from power switch pipe.

Description

The overcurrent protective device and household electrical appliance of power factor corrector
Technical field
The utility model is related to Alternating Current Power Supply technical field, the overcurrent protection dress of more particularly to a kind of power factor corrector Put and a kind of household electrical appliance with the device.
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.After single-phase AC voltage is through 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 need most protection Be power switch pipe, to prevent power switch pipe overcurrent damage.
Utility model content
The utility model is intended at least solve to a certain extent one of technical problem in correlation technique.Therefore, this reality It is to propose a kind of overcurrent protective device of power factor corrector with a new purpose, by the current sample in inductance When value is more than hardware overcurrent protection threshold value, control power switch pipe is off state, so as to be prevented effectively from power switch pipe hair Raw overcurrent damage.
Another purpose of the present utility model is to propose a kind of household electrical appliance.
To achieve the above object, on the one hand the utility model 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, be used to sample the electric current of the inductance with Current sampling data is obtained, wherein, the current sampling circuit is arranged on the positive DC side end or the power of the rectifier bridge The drain electrode end of switching tube;Driver element, the driver element is connected with the power switch pipe;Hardware current foldback circuit, institute State hardware current foldback circuit to be connected with the current sampling circuit and the driver element respectively, the hardware overcurrent protection electricity Road is used to the output hardware overcurrent protection signal when the current sampling data is more than hardware overcurrent protection threshold value and drives list to described Unit, controls the power switch pipe to be off state with by the driver element.
According to the overcurrent protective device of power factor corrector of the present utility model, by by current sampling circuit to electricity The electric current of sense is sampled to obtain current sampling data, and then hardware current foldback circuit is more than hardware excessively stream in current sampling data Output hardware overcurrent protection signal controls power switch pipe to be off to driver element with by driver element during rotection thresholds , there is overcurrent damage so as to be prevented effectively from power switch pipe in state.
Specifically, when the current sampling circuit is arranged on the positive DC side end or the power switch of the rectifier bridge During the drain electrode end of pipe, the current sampling circuit is resistance sampling circuit, transformer, voltage-type Hall current sensor and electric current One kind in type Hall current sensor.
Specifically, the hardware current foldback circuit includes:Comparison circuit, one end of the comparison circuit and the electric current Sample circuit is connected, and the other end of the comparison circuit is connected with the driver element and the controller respectively, the comparing Circuit is used to export the hardware overcurrent protection signal, institute when the current sampling data is more than the hardware overcurrent protection threshold value Stating comparison circuit includes voltage comparator or hysteresis comparator.
Further, the hardware current foldback circuit also includes:Signal conditioning circuit, the one of the signal conditioning circuit End is connected with the current sampling circuit, and the other end of the signal conditioning circuit is connected with one end of the comparison circuit, institute State signal conditioning circuit to be used to pre-process the current sampling data, the signal conditioning circuit is RC filter circuits, fortune Calculate the one kind in amplifying circuit and differential amplifier circuit.
Further, the hardware current foldback circuit also includes:Signal latch circuit, the one of the signal latch circuit End is connected with the other end of the comparison circuit, the other end of the signal latch circuit respectively with the driver element and described Controller is connected, and the signal latch circuit is used to latch the hardware overcurrent protection signal, the signal latch electricity Road includes rest-set flip-flop.
Specifically, the driver element includes that dual input list is exported and logic circuit.
Further, dual input list output and 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 logic circuit, tri-state gate circuit and digital switch chip in one kind.
To achieve the above object, on the other hand the utility model proposes a kind of household electrical appliance, and it includes above-mentioned power The overcurrent protective device of factor corrector.
Household electrical appliance of the present utility model, by the overcurrent protective device of above-mentioned power factor corrector, can be in electricity The current sampling data of sense is more than hardware overcurrent protection threshold value, output hardware overcurrent protection signal to driver element, with by driving Unit control power switch pipe is off state, so as to be prevented effectively from power switch pipe overcurrent damage, and then ensures household electric The safety and reliability of device work.
Brief description of the drawings
Fig. 1 a are to be arranged on rectifier bridge positive DC side end according to the current sampling circuit of the utility model one embodiment The circuit topology figure of power factor corrector.
Fig. 1 b are the drain electrode ends that power switch pipe is arranged on according to the current sampling circuit of the utility model one embodiment Power factor corrector circuit topology figure.
Fig. 1 c are the source terminals that power switch pipe is arranged on according to the current sampling circuit of the utility model one embodiment Power factor corrector circuit topology figure.
Fig. 1 d are the work(of the AC that rectifier bridge is arranged on according to the current sampling circuit of the utility model one embodiment The circuit topology figure of rate factor corrector.
Fig. 1 e are the power of the input that inductance is arranged on according to the current sampling circuit of the utility model one embodiment The circuit topology figure of factor corrector.
Fig. 1 f are the power of the output end that inductance is arranged on according to the current sampling circuit of the utility model one embodiment The circuit topology figure of factor corrector.
Fig. 2 is the circuit diagram of the current sampling circuit according to the utility model embodiment.
Fig. 3 is the structural representation of the hardware current foldback circuit according to the utility model embodiment.
Circuit diagrams of the Fig. 4 according to the comparison circuit of the utility model embodiment.
Fig. 5 is the circuit diagram of the signal conditioning circuit according to the utility model embodiment.
Fig. 6 is the circuit diagram of the signal latch circuit according to the utility model embodiment.
Fig. 7 is the circuit diagram of the driver element according to the utility model embodiment.
Fig. 8 is the flow chart of the over-current protection method of the power factor corrector according to the utility model embodiment.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng The embodiment for examining Description of Drawings is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model Limitation.
Describe the overcurrent protective device of the power factor corrector of the utility model embodiment, have with reference to the accompanying drawings The household electrical appliance of the overcurrent protective device and the over-current protection method of power factor corrector.
In embodiment of the present utility model, power factor corrector includes rectifier bridge 100, pfc circuit and electrochemical capacitor EC, wherein, 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 for flowing 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 with inductive current detection circuit 320 and driver element 330 respectively, 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 to driver element 330 is exported, work(is controlled with 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, resistance sampling can be used and isolation transmission is entered 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 according to shown in Fig. 1 c- Fig. 1 f position set when, it is necessary to Using isolation sample mode, i.e. need using the sample mode shown in similar Fig. 2 b- Fig. 2 e.Say, in reality of the present utility model In applying example, when current sampling circuit 310 be arranged on rectifier bridge 100 positive DC side end or power switch pipe Q drain electrode end when, Current sampling circuit 310 is resistance sampling circuit (including Fig. 2 a and Fig. 2 b), transformer, voltage-type Hall current sensor and electricity One kind in flow pattern Hall current sensor;When current sampling circuit 310 is arranged on source terminal, the rectifier bridge of power switch pipe Q During the output end of 100 AC, the input of inductance L or inductance L, current sampling circuit 310 is by sampling resistor and line Property the optocoupler sample circuit, transformer, voltage-type Hall current sensor and the current mode Hall current sensor that constitute in one Kind.
As shown in Fig. 1 a- Fig. 1 f, when power factor corrector works on power, can be by 310 pairs of electricity of current sampling circuit The electric current for feeling 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, drive Unit 330 carries out switch control 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, current value of the controller 340 also to inductance L judge, 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, controls power switch pipe Q to be off state, so as to realize to power switch pipe with by driver element 330 Protection, is prevented effectively from when the current value of inductance is excessive in time, and now still controls power switch pipe in the conduction state so that stream The electric current of overpower switching tube it is excessive and cause power switch pipe occur overcurrent damage.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 the power factor corrector according to the utility model embodiment, when the electric current of inductance When value is more than software overcurrent protection threshold value, directly control power switch pipe is off state, so as to be realized using software mode Timely protection to power switch pipe, is prevented effectively from power switch pipe overcurrent damage.
Further, according to one embodiment of the present utility model, controller 340 is additionally operable to obtain the current value of inductance L Time and number of times more than software overcurrent protection threshold value, the very first time and first number are designated as respectively, and judge that the very first time is It is no to be more than the first Preset Time, and judge first number whether more than the first preset times.If the very first time is more than first Preset Time, or first number is more than the first preset times, and controller 340 then exports the second control signal to driver element 330, close pfc circuit with by driver element 330.Wherein, the first Preset Time and the first preset times can be answered according to actual With the abnormal disturbed condition of AC power AC 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, is controlled with 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, it refers to lasting output switch-off power switch to close pfc circuit The control signal of pipe Q so that power switch pipe Q is constantly in off state, cannot now 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 Export the second control signal (such as persistently low level signal) and to driver element 330, power switch is controlled with by driver element 330 Pipe Q is constantly in off state, so as to be prevented effectively from the case of AC power unusual fluctuations, the situation that pfc circuit is closed by mistake, together When can be prevented effectively from for a long time and cross high frequency time to the impact of the excessively stream of power switch pipe.
Therefore, the overcurrent protective device of the power factor corrector according to the utility model embodiment, when the electric current of inductance When value is more than software overcurrent protection threshold value, control power switch pipe shut-off, so that the timely protection to power switch pipe is realized, and And, when the current value of inductance meets pre-conditioned more than the time of software overcurrent protection threshold value or the frequency, control pfc circuit is closed Close, 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 It is prevented effectively from for a 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 is mainly using software mode reality It is existing, and in other embodiment of the present utility model, the overcurrent protection to power switch pipe can be also realized using hardware circuit.
According to one embodiment of the present utility model, as shown in Fig. 1 a- Fig. 1 f, the excessively stream of above-mentioned power factor corrector Protection device may also include:Hardware current foldback circuit 350, hardware current foldback circuit 350 respectively with current sampling circuit 310 It is connected with driver element 330.Hardware current foldback circuit 350 is used for defeated when current sampling data is more than hardware overcurrent protection threshold value Go out hardware overcurrent protection signal to driver element 330, control power switch pipe Q to be off state with by driver element 330. Wherein, 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 current value and DC bus-bar voltage according to inductance L carry out PWM controls to power switch pipe Q, 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 control power switch pipe Q to close according to the hardware overcurrent protection signal It is disconnected, protected in time with 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 soft or hard combination.It is new as this practicality One specific example of type, is carried out according to the current value and DC bus-bar voltage of inductance L in controller 340 to power switch pipe Q During PWM is controlled, whether controller 340 also judges the current value of inductance L more than software overcurrent protection threshold value, and in inductance The current value of L exports the first control signal to driver element 330 when being more than software protection threshold value, meanwhile, hardware overcurrent protection electricity Road 350 also when the current sampling data for collecting is more than hardware overcurrent protection threshold value output hardware overcurrent protection signal to driving list Unit 330.When driver element 330 receives the either signal in the first control signal and hardware overcurrent protection signal, drive single Unit 330 all turns off control power switch pipe Q, is protected in time with to power switch pipe.
Further, as another specific example of the present utility model, controller 340 according to the current value of inductance L and During DC bus-bar voltage carries out PWM controls to power switch pipe Q, controller 340 also judge inductance L current value whether More than software overcurrent protection threshold value, and the first control signal to drive is exported when the current value of inductance L is more than software protection threshold value Moving cell 330, and controller 340 also determine whether the current value of inductance L more than the time of software overcurrent protection threshold value and It is pre-conditioned whether the frequency reaches, and when having one to reach condition set in advance in time and the frequency, output second is controlled Signal is to driver element 330.Meanwhile, hardware current foldback circuit 350 is also more than hardware excessively stream in the current sampling data for collecting Output hardware overcurrent protection signal is to driver element 330 during rotection thresholds.When driver element 330 receive the first control signal and During either signal in hardware overcurrent protection signal, driver element 330 will control power switch pipe Q shut-offs, with to power switch Pipe is protected in time, and when driver element 330 receives the second control signal, the control power switch of driver element 330 Pipe Q is constantly in closed mode, to close pfc circuit.So as to realize the multiple protective to power switch pipe so that power switch Pipe can obtain more effective, more reliable protection.
That is, when by the way of soft or hard combination, 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 to turn on, 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 the present utility model, as shown in Figure 3 a, hardware current foldback circuit 350 may include that comparing is electric Road 351, one end of comparison circuit 351 is connected with current sampling circuit 310, and the other end of comparison circuit 351 is single with driving respectively Unit 330 is connected with controller 340, and it is hard that comparison circuit 351 is used for the output when current sampling data is more than hardware overcurrent protection threshold value Part overcurrent protection signal.Further, as shown in figure 4, comparison circuit 351 may include voltage comparator or hysteresis comparator (hysteresis comparator).
According to another embodiment of the present utility model, as shown in Figure 3 b, hardware current foldback circuit 350 may also include letter Number modulate circuit 352, one end of signal conditioning circuit 352 is connected with current sampling circuit 310, signal conditioning circuit 352 it is another One end is connected with one end of comparison circuit 351, and signal conditioning circuit 352 is used to pre-process current sampling data, for example, right Current sampling data is filtered treatment or amplifies.Further, as shown in figure 5, signal conditioning circuit 352 can be filtered for RC One kind in circuit, operational amplification circuit and differential amplifier circuit.
According to another embodiment of the present utility model, as shown in Figure 3 c, hardware current foldback circuit 350 may also include letter Number latch cicuit 353, one end of signal latch circuit 353 is connected with the other end of comparison circuit 351, signal latch circuit 353 The other end be connected with driver element 330 and controller 340 respectively, signal latch circuit 353 be used for hardware overcurrent protection believe Number 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 with The rest-set flip-flop constituted for rest-set flip-flop chip or by NAND gate.
It is understood that hardware current foldback circuit 350 can also use other implementations, do not limit here specifically System.
Therefore, the overcurrent protective device of the power factor corrector according to the utility model embodiment, can not only pass through Software mode realizes the timely protection to power switch pipe, and the timely guarantor to power switch pipe can be realized using hardware mode Shield, when two ways is used simultaneously, is capable of achieving the multiple protective to power switch pipe so that power switch pipe can be obtained more Effectively, more reliable protection.
Further, according to one embodiment of the present utility model, as shown in Fig. 1 a- Fig. 1 f, hardware current foldback circuit 350 are also connected with controller 340, and controller 340 is additionally operable to obtain time and the number of times of hardware overcurrent protection signal, is designated as respectively Second time and second number, and whether judged for the second time more than the second Preset Time, and judge whether second number be big In the second preset times.If the second time was more than the second Preset Time, or second number is more than the second preset times, control Device 340 then exports the 3rd control signal to driver element 330, and pfc circuit is closed with by driver element 330.
Specifically, power switch pipe Q is carried out according to the current value and DC bus-bar voltage of inductance L in controller 340 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 and the frequency for protecting signal 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, controls power switch pipe Q to be constantly in off state, so as to be prevented effectively from AC power with by driver element 330 In the case of unusual fluctuations, the situation that pfc circuit is closed by mistake, while can be prevented effectively from for a long time and cross high frequency time to power switch pipe Excessively stream impact.
Further, in another specific example of the present utility model, controller 340 also detects the current value of inductance L During whether more than software overcurrent protection threshold value, if it does, controller 340 then exports the first control signal to driver element 330. When driver element 330 receives the either signal in the first control signal and hardware overcurrent protection signal, driver element 330 will The Q shut-offs of control power switch pipe, are protected in time with to power switch pipe, and when driver element 330 receives the 3rd control During signal processed, the control of driver element 330 power switch pipe Q is constantly in closed mode, to close pfc circuit.It is right so as to realize The multiple protective of power switch pipe so that power switch pipe can obtain more effective, more reliable protection.
Yet further, in another specific example of the present utility model, controller 340 is yet further still according to inductance L's Current value judges whether to need to close pfc circuit more than the time of software overcurrent protection threshold value and the frequency, if it is desired, controller 340 will export the second control signal to driver element 330.When driver element 330 receives the first control signal and hardware excessively stream During either signal in protection signal, driver element 330 will control power switch pipe Q shut-offs, carrying out to power switch pipe and When protect, and when driver element 330 receives the either signal in the second control signal and the 3rd control signal, drive single Unit 330 controls power switch pipe Q to be constantly in closed mode, to close pfc circuit.So as to realize to the multiple of power switch pipe Protection 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 utility model embodiment can be realized opening power Four kinds of protections of pipe are closed, including:When current value is more than software overcurrent protection threshold value, controller 340 exports 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 is more than software overcurrent protection threshold When the time of value or the frequency meet pre-conditioned, controller 340 exports the second control signal so that power switch pipe Q is constantly in Off state;When current sampling data is more than hardware overcurrent protection threshold value, the output hardware excessively stream of hardware current foldback circuit 350 is protected Shield signal is so that power switch pipe Q is turned off;When current sampling data is more than hardware overcurrent protection threshold value, and current sampling data is more than When the time of hardware overcurrent protection threshold value or the frequency meet pre-conditioned, controller 340 exports the 3rd control signal so that power Switching tube Q is constantly in off state.The protected mode for specifically being used 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 required when opening power switch pipe Q simultaneously, and driver element 330 is just exported to be opened power and open Close the drive signal of pipe Q;Otherwise, the drive signal of output switch-off power switching tube Q.Wherein, driver element 330 can be used and patrolled Collect to realize.
According to one embodiment of the present utility model, driver element 330 may include the output of dual input list and logic circuit.Such as Shown in Fig. 7, dual input list output with logic circuit can be with gate circuit, be made up of NAND gate and not gate with logic circuit, Be made up of two NAND gates with logic circuit, tri-state gate circuit and digital switch chip in one kind.
In sum, the overcurrent protective device of the power factor corrector according to the utility model embodiment, can realize To the timely protection on the software and hardware of power switch pipe, it is to avoid power switch pipe occurs overcurrent damage, and exchange is avoided that again The pfc circuit caused when abnormity of power supply is closed by mistake, influences the problem of systematic function, while can avoid for a long time and high again The frequency is impacted to the excessively stream of power switch pipe.
In addition, embodiment of the present utility model also proposed a kind of household electrical appliance, it includes above-mentioned PFC The overcurrent protective device of device.
According to the household electrical appliance of the utility model embodiment, filled by the overcurrent protection of above-mentioned power factor corrector Put, power switch pipe overcurrent damage can be prevented effectively from, and then ensure the safety and reliability of household electric appliance operation.
Fig. 8 is the flow chart of the over-current protection method of the power factor corrector according to the utility model embodiment.At this In the embodiment of utility model, power factor corrector includes rectifier bridge, pfc circuit and electrochemical capacitor, wherein, pfc circuit bag Include inductance, power switch pipe and diode.
As shown in figure 8, the over-current protection method of the power factor corrector may include following steps:
S1, the electric current to inductance is sampled to obtain current sampling data, and the electricity of inductance is obtained 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 the power factor corrector according to the utility model embodiment, when the electric current of inductance When value is more than software overcurrent protection threshold value, directly control power switch pipe is off state, so as to realize to power switch pipe Timely protection, be prevented effectively from power switch pipe overcurrent damage.
According to one embodiment of the present utility model, the over-current protection method of above-mentioned power factor corrector also includes: Time of the current value more than software overcurrent protection threshold value and the number of times of inductance are obtained, the very first time and first number are designated as respectively, And whether the very first time is judged more than the first Preset Time, and judge first number whether more than the first preset times;If The very 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 root Pfc circuit is closed according to the second control signal.
Therefore, the over-current protection method of the power factor corrector according to the utility model embodiment, when the electric current of inductance When value is more than software overcurrent protection threshold value, control power switch pipe shut-off, so that the timely protection to power switch pipe is realized, together When, when the current value of inductance meets pre-conditioned more than the time of software overcurrent protection threshold value or the frequency, control pfc circuit is closed Close, 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 It is prevented effectively from for a long time and crosses excessively stream impact of the high frequency time to power switch pipe.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " suitable The orientation or position relationship of the instruction such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on orientation shown in the drawings Or position relationship, be for only for ease of description the utility model and simplify and describe, rather than indicate or imply signified device or Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model System.
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 description of the present utility model, " multiple " is meant that at least two, such as two It is individual, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally;Can be Mechanically connect, or electrically connect;Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two The connection of element internal or two interaction relationships of element, unless otherwise clearly restriction.For the common skill of this area For art personnel, concrete meaning of the above-mentioned term in the utility model can be as the case may be understood.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score Can be the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, first is special Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with Be fisrt feature immediately below second feature or obliquely downward, or be 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 utility model or example.In this manual, to the schematic table of above-mentioned term State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be with Combined in an appropriate manner in any one or more embodiments or example.Additionally, in the case of not conflicting, this area Technical staff the feature of the different embodiments or example described in this specification and different embodiment or example can be entered Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model It is interior above-described embodiment to be changed, changed, replaced and modification.

Claims (8)

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 include inductance, power switch pipe and diode, the overcurrent protective device Including:
Current sampling circuit, is used to sample to obtain current sampling data the electric current of the inductance, wherein, the electric current is adopted Sample circuit is arranged on the positive DC side end of the rectifier bridge or the drain electrode end of the power switch pipe;
Driver element, the driver element is connected with the power switch pipe;
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 to the output hardware mistake when the current sampling data is more than hardware overcurrent protection threshold value Stream protection signal controls the power switch pipe to be off state to the driver element with by the driver element.
2. the overcurrent protective device of power factor corrector as claimed in claim 1, it is characterised in that when the current sample Circuit be arranged on the rectifier bridge positive DC side end or the power switch pipe drain electrode end when, the current sampling circuit It is the one kind in resistance sampling circuit, transformer, voltage-type Hall current sensor and current mode Hall current sensor.
3. the overcurrent protective device of power factor corrector as claimed in claim 1 or 2, it is characterised in that the hardware mistake Stream 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 controller, the comparison circuit is used to be more than the hardware excessively stream in the current sampling data The hardware overcurrent protection signal is exported during rotection thresholds, the comparison circuit includes voltage comparator or hysteresis comparator.
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 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 used to carry out the current sampling data pre- Treatment, the signal conditioning circuit is the one kind in RC filter circuits, operational amplification circuit and differential amplifier circuit.
5. the overcurrent protective device of power factor corrector as claimed in claim 4, 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 with the driver element and the controller respectively, and the signal latch circuit is used to described hard Part overcurrent protection signal is latched, and the signal latch circuit includes rest-set flip-flop.
6. 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.
7. the overcurrent protective device of power factor corrector as claimed in claim 6, it is characterised in that the dual input list is defeated Go out 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 patrol Collect the one kind in circuit, tri-state gate circuit and digital switch chip.
8. a kind of household electrical appliance, it is characterised in that including the power factor corrector as any one of claim 1-7 Overcurrent protective device.
CN201621165034.7U 2016-10-31 2016-10-31 The overcurrent protective device and household electrical appliance of power factor corrector Active CN206225996U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106655102A (en) * 2016-10-31 2017-05-10 广东美的制冷设备有限公司 Power factor corrector over-current protection device and home appliance
CN107332213A (en) * 2017-07-18 2017-11-07 深圳市华星光电半导体显示技术有限公司 Current foldback circuit
CN108923377A (en) * 2018-08-28 2018-11-30 海信(山东)空调有限公司 A kind of the IGBT overcurrent protective device and method of pfc circuit
CN111391611A (en) * 2020-03-25 2020-07-10 广州华凌制冷设备有限公司 Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106655102A (en) * 2016-10-31 2017-05-10 广东美的制冷设备有限公司 Power factor corrector over-current protection device and home appliance
CN107332213A (en) * 2017-07-18 2017-11-07 深圳市华星光电半导体显示技术有限公司 Current foldback circuit
CN108923377A (en) * 2018-08-28 2018-11-30 海信(山东)空调有限公司 A kind of the IGBT overcurrent protective device and method of pfc circuit
CN111391611A (en) * 2020-03-25 2020-07-10 广州华凌制冷设备有限公司 Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium

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