CN105450054B - Circuit of power factor correction carries auxiliary power circuit and its control method and device - Google Patents
Circuit of power factor correction carries auxiliary power circuit and its control method and device Download PDFInfo
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- CN105450054B CN105450054B CN201410298516.9A CN201410298516A CN105450054B CN 105450054 B CN105450054 B CN 105450054B CN 201410298516 A CN201410298516 A CN 201410298516A CN 105450054 B CN105450054 B CN 105450054B
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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
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- 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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Abstract
A kind of included auxiliary power circuit of pfc circuit, including：Pfc circuit receives the AC-input voltage from AC power source, and generates load required DC output voltage and accessory power supply voltage output；PFC payload size decision circuitry, receives the output electric current from pfc circuit, and according to the output electric current judge pfc circuit load be it is high or low, when judge that pfc circuit loads high, to alternating current instantaneous voltage detetion circuit output shielded signal；Alternating current instantaneous voltage detetion circuit receives the AC-input voltage from AC power source, detects to the instantaneous value of AC-input voltage, generates the pulse signal synchronous with AC-input voltage, and by the enable end of the output of pulse signal to PFC control circuit；PFC control circuit is in off working state when its enable end receives low level pulse signal according to normal operation mode control pfc circuit work when its enable end receives the pulse signal of high level.
Description
Technical field
The present invention relates to PFC (power factor correction, PFC) technical fields, more specifically
It says, is related to a kind of pfc circuit and carries auxiliary power circuit and its control method and control device.
Background technique
Fig. 1 is that existing pfc circuit carries auxiliary power circuit.
As described in Figure 1, the included auxiliary power circuit of pfc circuit includes：Rectifier bridge DB1-DB4 receives AC-input voltage,
And AC-input voltage is rectified into DC input voitage；Input capacitor CBB2 is parallel between rectifier bridge DB1-DB4, right
Rectification bridge output signal is filtered；PFC Switching Power Supply including inductance L2, switching tube Q1 and diode D1, with input capacitance
Device CBB2 is in parallel, for direct current output needed for generating load.
Fig. 2 is that the existing pfc circuit comprising PFC control circuit carries auxiliary power circuit.
PFC control circuit controls the work of PFC Switching Power Supply by output drive signal.
Fig. 1 and two kinds of PFC inductance auxiliary winding shown in Fig. 2 can be used as accessory power supply and supply to control route
Electricity, they have a feature be exactly PFC very gently load or it is unloaded when energy can hardly be provided, in this case in entire electricity
Source very gently load or standby mode under, stable accessory power supply cannot be provided.
Fig. 3 and Fig. 4 shows the electricity in the PFC at light load included auxiliary power circuit of existing pfc circuit on inductance L2
Stream flow direction.
In the case where PFC underloading, within a power frequency period PFC control circuit may only issue a string it is small number of
Driving pulse (namely driving pulse is interrupted, for example only 10ms PFC control circuit is driven in hair in a power frequency period 50ms
Moving pulse, often load lighter, the time scale of work is shorter) carry out driving switch pipe Q1.The main winding of inductance L2 and auxiliary
Helping winding is coupling, and when having electric current flowing, main winding and auxiliary winding all induce the voltage of corresponding ratio.
As shown in figure 3, if pulse is sending when instantaneous AC input voltage is high, after pulse-off,
Inductance L2 main winding two sides voltage difference is smaller, i.e. voltage drop is small, and the electric current on inductance L2 can be defeated along the direction of PFC main circuit
Out.
As shown in figure 4, if pulse is sending when instantaneous AC input voltage is low, inductance when pulse-off
The two sides L2 voltage difference is bigger, i.e. pressure drop is high, because the voltage i.e. input voltage at 2 end of inductance L2 main winding are low, and 3 ends
Voltage i.e. output voltage substantially constant, so pressure drop is bigger, inductance L2 main winding pressure drop is big, inductance L2 auxiliary winding
Also bigger voltage can be induced, the current direction in inductance L2 auxiliary winding is as shown in Figure 4.
The present invention is based on what the phenomenon in Fig. 3 and Fig. 4 obtained.
Summary of the invention
Additional aspects of the present invention and advantage part will be set forth in the description that follows, and there are also parts can be from description obviously
Ground is found out, or can obtain in the practice of the invention.
The application is a kind of novel auxiliary power circuit based on pfc circuit, is existed using in PFC control circuit at light load
It is connected when AC-input voltage is low, that is, PFC control circuit works normally when the instantaneous value absolute value of alternating voltage is low, so that PFC
Control circuit is pressed through in alternating current and is worked near 0, so that output can be stablized at light load by realizing.
This application discloses a kind of pfc circuits to carry auxiliary power circuit, including：Pfc circuit receives and comes from AC power source
AC-input voltage, and generate load needed for DC output voltage and accessory power supply voltage output；PFC payload size is sentenced
Deenergizing, receive the output electric current from pfc circuit, and according to the output electric current judge pfc circuit load be height or it is low,
When judging that pfc circuit load is high, shielded signal is exported to alternating current instantaneous voltage detetion circuit；Alternating current transient fault voltage detection
Circuit receives the AC-input voltage from AC power source, detects to the instantaneous value of AC-input voltage, generate and exchange
The synchronous pulse signal of input voltage, and by the enable end of the output of pulse signal to PFC control circuit；PFC control circuit, when
When its enable end receives the pulse signal of high level, according to normal operation mode control pfc circuit work, when its enabled termination
When receiving low level pulse signal, it is in off working state.
Disclosed herein as well is the control devices that a kind of pfc circuit carries auxiliary power circuit, and the pfc circuit is according to PFC
The control of control circuit works, which includes：PFC payload size decision circuitry is received from the defeated of pfc circuit
Electric current out, and according to the output electric current judge pfc circuit load be it is high or low, when judge that pfc circuit loads high, to friendship
Galvanic electricity instantaneous voltage detetion circuit exports shielded signal；Alternating current instantaneous voltage detetion circuit receives the friendship from AC power source
Input voltage is flowed, the instantaneous value of AC-input voltage is detected, generates the pulse signal synchronous with AC-input voltage, and
By the enable end of the output of pulse signal to PFC control circuit.
Disclosed herein as well is the control methods that a kind of pfc circuit carries auxiliary power circuit, and the pfc circuit is according to PFC
The control of control circuit works, which includes：The load of detection pfc circuit is high or low；When detecting PFC
When the load of circuit is low, AC-input voltage is detected；The pulse signal synchronous with AC-input voltage is generated, and is output to
PFC control circuit；Pulse signal control PFC control circuit is in running order or off working state.
Detailed description of the invention
The preferred embodiment of the present invention is described in detail in conjunction with the accompanying drawings, above and other purpose of the invention,
Characteristics and advantages will become apparent, wherein identical label specifies mutually isostructural unit, and wherein：
Fig. 1 is that existing pfc circuit carries auxiliary power circuit.
Fig. 2 is that the existing pfc circuit comprising PFC control circuit carries auxiliary power circuit.
Fig. 3 and Fig. 4 shows the electricity in the PFC at light load included auxiliary power circuit of existing pfc circuit on inductance L2
Stream flow direction.
Fig. 5 shows the block diagram that pfc circuit according to an embodiment of the present invention carries auxiliary power circuit.
Fig. 6 shows the physical circuit schematic diagram of alternating current instantaneous voltage detetion circuit according to an embodiment of the present invention.
Fig. 7 A and 7B are the pulse signals pair exported according to embodiments of the present invention by alternating current instantaneous voltage detetion circuit
The mode that PFC control circuit is controlled.
Fig. 8 shows the control method flow chart that pfc circuit according to an embodiment of the present invention carries auxiliary power circuit.
Specific embodiment
The present invention is fully described below with reference to the attached drawing for showing the embodiment of the present invention.However, the present invention can be with many
Different forms is realized, and should not be assumed that be limited to the embodiments described herein.On the contrary, thesing embodiments are provided so that this public affairs
It opens thorough and complete, and the scope of the present invention will be given full expression to those skilled in the art.In the accompanying drawings, for the sake of clarity
It is exaggerated component.
It should be appreciated that when title " element " " being connected to " or when " coupled " to another element, it, which can be, is directly connected to or coupling
It is connected to another element or there may be intermediary elements.On the contrary, when claiming element " being directly connected to " or " being directly coupled to " another
When element, intermediary element is not present.Identical appended drawing reference indicates identical element.Term "and/or" used herein includes
Any and all combinations for the project that one or more correlations are listed.
It will be appreciated that though term first, second, third, etc., which may be used herein, describes each element, component and/or portion
Point, but these elements, component and/or part should not be limited by these terms.These terms are used only for element, component or part
Mutually distinguish.Therefore, first element discussed below, component or part can be under the premise of imparting knowledge to students without departing substantially from the present invention
Referred to as second element, component or part.
Unless otherwise defined, all terms (including technical and scientific term) used herein have leads with belonging to the present invention
The identical meanings that the those of ordinary skill in domain is commonly understood by.It is also understood that those of definition term such as in usual dictionary
The meaning consistent with their meanings in the context of the relevant technologies should be interpreted as having, without application idealization or
The meaning of extremely formalization explains, unless being clearly defined herein.
Of the invention is mainly technically characterized by, by additional control circuit, so that pfc circuit is unloaded or extremely light negative
When load, it is the sending of low potential moment that the interrupted driving pulse that PFC control circuit issues, which is entirely in input AC electricity, and is controlled
PFC control circuit does not work when input AC electricity is high potential, this makes it possible to guarantee that there is biggish voltage difference at inductance both ends,
To guarantee the auxiliary winding voltage output of the inductance as accessory power supply.
Fig. 5 shows the block diagram that pfc circuit according to an embodiment of the present invention carries auxiliary power circuit.
As shown in figure 5, the included auxiliary power circuit of pfc circuit includes：Pfc circuit 501, PFC control circuit 503 and
Control device.The control device includes alternating current instantaneous voltage detetion circuit 502 and PFC payload size decision circuitry 504.
Pfc circuit 501 receive the AC-input voltage from AC power source, and generate load needed for direct current output and
Accessory power supply voltage output.
PFC payload size decision circuitry 504 receives the direct current output from pfc circuit 501, and is sentenced according to the direct current output
The load of disconnected pfc circuit 501 is high or low.When PFC payload size decision circuitry 504 judges that pfc circuit 501 loads height (completely
Carry) when, shield alternating current instantaneous voltage detetion circuit 502.At this point, pfc circuit 501 and the plug-in accessory power supply work of tradition PFC
State is identical.PFC payload size decision circuitry 504 is used to shield alternating current instantaneous voltage in 501 high load of pfc circuit
Detection circuit 502, and shielded signal is not exported to alternating current instantaneous voltage detetion circuit 502 in 501 low-load of pfc circuit.
Although showing PFC payload size decision circuitry 504 in Fig. 5 to be judged according to the direct current output from pfc circuit 501
The height of the load of pfc circuit 501, it will be understood by those skilled in the art that PFC payload size decision circuitry 504 can be with
The height of the load of pfc circuit 501 is judged according to other signals.Turn for example, being usually further connected with DC-DC behind pfc circuit
Parallel operation, PFC payload size decision circuitry 504 also can receive the enable signal or output power of the DC-DC converter, and according to
This height to judge the load of pfc circuit 501.
Alternating current instantaneous voltage detetion circuit 502 is receiving the shielded signal from PFC payload size decision circuitry 504
When, do not work (shielded signal is, for example, long high level).And it does not receive from PFC payload size decision circuitry 504
When shielded signal, namely in the underloading of pfc circuit 501 or zero load, alternating current instantaneous voltage detetion circuit 502 works.
Alternating current instantaneous voltage detetion circuit 502 receives the AC-input voltage from AC power source, to exchange input electricity
The instantaneous value of pressure is detected, and obtains pulse signal synchronous with AC-input voltage (such as AC-input voltage
The pulse signal is high level when instant absolute value is lower than predetermined threshold, and is higher than in the instant absolute value of AC-input voltage pre-
When determining threshold value, which is low level), then by the output of pulse signal to the enable end of PFC control circuit 503.
The enable end return pulse signal of PFC control circuit 503.When pulse signal is high level, PFC control circuit
503 are enabled, and to work according to normal operation mode control pfc circuit 502, i.e. switching tube Q1 is according to from PFC control electricity
The driving voltage on road 503 and on or off, and allow input current waveform floating voltage waveform, while the inductance of pfc circuit 502
The auxiliary winding of L2 induces voltage as accessory power supply output voltage.When pulse signal is low level, PFC control circuit
503 are prohibited work.
Using the present invention, only alternating current instantaneous voltage detetion circuit can be made when ac input signal is low
502 are possible to issue high level signal, to force PFC control circuit 503 in running order, to guarantee that PFC inductance is auxiliary
Help winding output voltage for height.
It should be appreciated by those skilled in the art that pfc circuit 501 and PFC control circuit 503 can be using such as Fig. 1 and Fig. 2 institutes
The existing pfc circuit and its control circuit stated can also use other suitable pfc circuits and its control circuit.
Fig. 6 shows the physical circuit schematic diagram of alternating current instantaneous voltage detetion circuit 502 according to an embodiment of the present invention.
As shown in fig. 6, alternating current instantaneous voltage detetion circuit 502 includes the first and second diode D8 and D9, pressure stabilizing two
Pole pipe ZD3 and triode Q4.The anode of first diode D8 and the anode of the second diode D9 are as alternating current instantaneous voltage
The input terminal of detection circuit 502 receives the input from AC power source.The anode of first diode D8 is coupled to AC power source
The anode at the end firewire L, the second diode D9 is coupled to the zero curve N-terminal of AC power source, the cathode of first diode D8 and the two or two
The cathode of pole pipe D9 is commonly coupled to the cathode of zener diode ZD3, and the anode of zener diode ZD3 is coupled to triode Q4's
Base stage, output end of the collector of triode Q4 as alternating current instantaneous voltage detetion circuit 502, the emitter of triode Q4 connect
Ground.
Alternating current instantaneous voltage detetion circuit 502 further includes first to fourth resistor R37, R38, R39, R14.First to
3rd resistor device R37-R39 is connected to tie point and the pressure stabilizing of the cathode of first diode D8 and the cathode of the second diode D9
Between the cathode of diode ZD3, the collector of triode Q4 is connected to power supply Vcc by the 4th resistor R14.
Alternating current instantaneous voltage detetion circuit 502 detects the received exchange from AC power source of its input terminal and inputs electricity
Pressure, when detecting the instant absolute value of input voltage lower than predetermined threshold, alternating current instantaneous voltage detetion circuit 502 passes through it
Output end exports high level pulse signal to PFC control circuit 503, to enable the normal work of PFC control circuit 503.Work as detection
To input voltage instant absolute value be higher than predetermined threshold when, alternating current instantaneous voltage detetion circuit 502 by its output end it is defeated
Low level pulse signal out, PFC control circuit 503 are prohibited work.
It should be appreciated by those skilled in the art that alternating current instantaneous voltage detetion circuit 502 is not limited to electricity shown in fig. 6
Road, Fig. 6 are only one of the implementation of alternating current instantaneous voltage detetion circuit 502.It is instantaneous to can be realized alternating current of the present invention
Any circuit of the function of voltage detecting circuit 502 is all within the scope of the present invention.
Fig. 7 A and 7B are the pulse signals exported according to embodiments of the present invention by alternating current instantaneous voltage detetion circuit 502
The mode that PFC control circuit 503 is controlled.
PFC control circuit 503 shown in Fig. 7 A and 7B is existing L6562PFC controller.
As shown in Figure 7 A, the pulse signal that alternating current instantaneous voltage detetion circuit 502 exports can be directly output to PFC
Zero current detector in control circuit 503, to enable the current zero-crossing point detection part of L6562PFC controller.Alternatively, such as
Shown in Fig. 7 B, the pulse signal that alternating current instantaneous voltage detetion circuit 502 exports can be directly output to PFC control circuit
Driver in 503, with directly enabled PFC pulse output par, c.PFC can be forced by applying enable signal by both modes
Control circuit 503 does not work when AC-input voltage is high, and is lower than predetermined threshold in the instant absolute value of AC-input voltage
When work normally.
That is, PFC control circuit 503 is not mentioned to the switching tube Q1 inside pfc circuit 501 when AC-input voltage is high
For driving voltage；And when the instant absolute value of AC-input voltage is lower than predetermined threshold, PFC control circuit 503 is to pfc circuit
Switching tube Q1 inside 501 provides driving voltage.
It should be appreciated by those skilled in the art that PFC control circuit 503 is not limited to L6562PFC controller shown in Fig. 7,
Therefore, mode shown in Fig. 7 is also not necessarily limited to the mode of PFC control circuit 503 plus enable signal.It can be realized of the invention
Any circuit of 503 function of PFC control circuit and to the various modes of the PFC control circuit 503 plus enable signal all at this
In the protection scope of invention.
Fig. 8 shows the control method flow chart that pfc circuit according to an embodiment of the present invention carries auxiliary power circuit.
In step 801, it is high or low for detecting the load of pfc circuit.
In step 802, when the load of pfc circuit is low, AC-input voltage is detected.
In step 803, the pulse signal synchronous with AC-input voltage is generated, and is output to PFC control circuit, wherein
When the instant absolute value of AC-input voltage is lower than predetermined threshold, the pulse signal is high level；Work as AC-input voltage
Instant absolute value be higher than predetermined threshold when, the pulse signal be low level.
In step 804, the pulse signal control PFC control circuit is in running order or off working state, that is, works as
Normal work when PFC control circuit receives high level pulse signal does not work when receiving low level pulse signal.
The improved control device that pfc circuit according to an embodiment of the present invention carries auxiliary power circuit has exchange input
Instantaneous voltage detection circuit, and the output signal of alternating voltage instantaneous value detection circuit is output in PFC control circuit,
And under underloading, when AC-input voltage is low, which exports high level pulse, and in weight
Under load, this function of the alternating voltage instantaneous value detection circuit is shielded.
Improved control method according to an embodiment of the present invention is suitable for using the auxiliary winding of pfc circuit as auxiliary electricity
Source, and require that pfc circuit pole is lightly loaded or this unloaded lower accessory power supply can also export that (standby mode has control circuit work
Make).For example, the driving circuit of lamps and lanterns, which has, controls and receives module, and when lamps and lanterns close (main output is closed), control circuit
Also to receive remote signal.
The above is the description of the invention, and is not considered as limitation ot it.Notwithstanding of the invention several
Exemplary embodiment, but those skilled in the art will readily appreciate that, before without departing substantially from teaching and advantage of the invention
Many modifications can be carried out to exemplary embodiment by putting.Therefore, all such modifications are intended to be included in claims institute
In the scope of the invention of restriction.It should be appreciated that being the description of the invention above, and it should not be considered limited to disclosed spy
Determine embodiment, and the model in the appended claims is intended to encompass to the modification of the disclosed embodiments and other embodiments
In enclosing.The present invention is limited by claims and its equivalent.
Claims (12)
1. a kind of pfc circuit carries auxiliary power circuit, including：
Pfc circuit receives the AC-input voltage from AC power source, and DC output voltage and auxiliary needed for generating load
Supply voltage is helped to export；
PFC payload size decision circuitry receives the direct current output from pfc circuit, and judges pfc circuit according to the direct current output
Load be it is high or low, when judge that pfc circuit load is high, to alternating current instantaneous voltage detetion circuit output shielded signal；
Alternating current instantaneous voltage detetion circuit receives the AC-input voltage from AC power source, to the wink of AC-input voltage
Duration is detected, and generates the pulse signal synchronous with AC-input voltage, and by the output of pulse signal to PFC control circuit
Enable end；
PFC control circuit, when its enable end receives the pulse signal of high level, according to normal operation mode control PFC electricity
Road work is in off working state when its enable end receives low level pulse signal,
Wherein, the alternating current instantaneous voltage detetion circuit includes：
First and second diodes, the anode of first diode and the anode of the second diode are as alternating current transient fault voltage detection
The input terminal of circuit receives the input from AC power source, and the anode of first diode is coupled to the end firewire L of AC power source,
The anode of second diode is coupled to the zero curve N-terminal of AC power source,
Zener diode, the connection of the negative couplings of zener diode to the cathode of first diode and the cathode of the second diode
Point,
Triode, the base stage of triode are coupled to the anode of zener diode, and the collector of triode is instantaneously electric as alternating current
The output end of detection circuit is pressed, the emitter of triode is grounded,
The instantaneous value to AC-input voltage detects, and generates the pulse signal synchronous with AC-input voltage and includes：
When the instant absolute value for the AC-input voltage that the input terminal of alternating current instantaneous voltage detetion circuit receives is lower than predetermined threshold
When, the pulse signal of the output end output high level of alternating current instantaneous voltage detetion circuit, and work as alternating current transient fault voltage detection
When the instant absolute value for the AC-input voltage that the input terminal of circuit receives is higher than predetermined threshold, alternating current transient fault voltage detection
The output end of circuit exports low level pulse signal.
2. pfc circuit as described in claim 1 carries auxiliary power circuit, alternating current instantaneous voltage detetion circuit further includes：
First, to 3rd resistor device, is connected to tie point and the pressure stabilizing of the cathode of first diode and the cathode of the second diode
Between the cathode of diode；
The collector of 4th resistor, triode is connected to power supply by the 4th resistor.
3. pfc circuit as claimed in claim 2 carries auxiliary power circuit, wherein loaded in the pfc circuit and PFC
It further include DC-DC converter between size decision circuitry, PFC payload size decision circuitry receives the enabled of the DC-DC converter
Signal perhaps output power and judges that the load of pfc circuit is high or low according to the enable signal or output power.
4. pfc circuit as claimed in claim 3 carries auxiliary power circuit, alternating current instantaneous voltage detetion circuit believes pulse
The driver number being directly output in PFC control circuit, with directly enabled PFC pulse output par, c.
5. a kind of pfc circuit carries the control device of auxiliary power circuit, the pfc circuit according to the control of PFC control circuit into
Row work, the control device include：
PFC payload size decision circuitry receives the direct current output from pfc circuit, and judges pfc circuit according to the direct current output
Load be it is high or low, when judge that pfc circuit load is high, to alternating current instantaneous voltage detetion circuit output shielded signal；
Alternating current instantaneous voltage detetion circuit receives the AC-input voltage from AC power source, to the wink of AC-input voltage
Duration is detected, and generates the pulse signal synchronous with AC-input voltage, and by the output of pulse signal to PFC control circuit
Enable end,
Wherein, the alternating current instantaneous voltage detetion circuit includes：
First and second diodes, the anode of first diode and the anode of the second diode are as alternating current transient fault voltage detection
The input terminal of circuit receives the input from AC power source, and the anode of first diode is coupled to the end firewire L of AC power source,
The anode of second diode is coupled to the zero curve N-terminal of AC power source,
Zener diode, the connection of the negative couplings of zener diode to the cathode of first diode and the cathode of the second diode
Point,
Triode, the base stage of triode are coupled to the anode of zener diode, and the collector of triode is instantaneously electric as alternating current
The output end of detection circuit is pressed, the emitter of triode is grounded,
The instantaneous value to AC-input voltage detects, and generates the pulse signal synchronous with AC-input voltage and includes：
When the instant absolute value for the AC-input voltage that the input terminal of alternating current instantaneous voltage detetion circuit receives is lower than predetermined threshold
When, the pulse signal of the output end output high level of alternating current instantaneous voltage detetion circuit, and work as alternating current transient fault voltage detection
When the instant absolute value for the AC-input voltage that the input terminal of circuit receives is higher than predetermined threshold, alternating current transient fault voltage detection
The output end of circuit exports low level pulse signal.
6. control device as claimed in claim 5, wherein when the pulse of alternating current instantaneous voltage detetion circuit output high level
When signal, PFC control circuit is enabled according to normal operation mode control pfc circuit work, when alternating current transient fault voltage detection electricity
When road exports low level pulse signal, PFC control circuit is forbidden to work.
7. control device as claimed in claim 6, alternating current instantaneous voltage detetion circuit further include：
First, to 3rd resistor device, is connected to tie point and the pressure stabilizing of the cathode of first diode and the cathode of the second diode
Between the cathode of diode；
The collector of 4th resistor, triode is connected to power supply by the 4th resistor.
8. control device as claimed in claim 7, wherein between the pfc circuit and PFC payload size decision circuitry
It further include DC-DC converter, PFC payload size decision circuitry receives the enable signal or output power of the DC-DC converter,
And judge that the load of pfc circuit is high or low according to the enable signal or output power.
9. control device as claimed in claim 7, pulse signal is directly output to PFC by alternating current instantaneous voltage detetion circuit
Driver in control circuit, with directly enabled PFC pulse output par, c.
10. a kind of pfc circuit for as described in claim 1-4 is any carries the control method of auxiliary power circuit, the PFC
Circuit works according to the control of PFC control circuit, which includes：
The load of detection pfc circuit is high or low；
When the load for detecting pfc circuit is low, AC-input voltage is detected；
The pulse signal synchronous with AC-input voltage is generated, and is output to PFC control circuit；
Pulse signal control PFC control circuit is in running order or off working state.
11. control method as claimed in claim 10, wherein when the instant absolute value of AC-input voltage is lower than predetermined threshold
When, the pulse signal is high level；When the instant absolute value of AC-input voltage is higher than predetermined threshold, the pulse signal
For low level.
12. control method as claimed in claim 11, wherein when receiving high level pulse signal, PFC control circuit is being just
Often work, forbids PFC control circuit to work when receiving low level pulse signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298516.9A CN105450054B (en) | 2014-06-26 | 2014-06-26 | Circuit of power factor correction carries auxiliary power circuit and its control method and device |
| PCT/CN2014/089410 WO2015196672A1 (en) | 2014-06-26 | 2014-10-24 | Auxiliary power source circuit with power factor correction circuit, and control method and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298516.9A CN105450054B (en) | 2014-06-26 | 2014-06-26 | Circuit of power factor correction carries auxiliary power circuit and its control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105450054A CN105450054A (en) | 2016-03-30 |
| CN105450054B true CN105450054B (en) | 2018-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410298516.9A Active CN105450054B (en) | 2014-06-26 | 2014-06-26 | Circuit of power factor correction carries auxiliary power circuit and its control method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105450054B (en) |
| WO (1) | WO2015196672A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395013A (en) * | 2016-05-17 | 2017-11-24 | 亚荣源科技（深圳）有限公司 | Power generation circuit and its operating method |
| CN106714382B (en) * | 2017-01-11 | 2018-05-04 | 福州华芯电子有限公司 | Quantization PFC based on the detection of full voltage wave crest |
| CN107134922B (en) * | 2017-07-05 | 2023-10-31 | 郑州工业应用技术学院 | Conversion circuit of power supply for instrument |
| CN110086328B (en) * | 2019-06-19 | 2024-05-07 | 深圳莱福德科技股份有限公司 | Power-on time sequence control circuit |
| CN113394964B (en) * | 2021-06-15 | 2023-06-09 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and PFC circuit applying same |
| CN115912584B (en) * | 2022-11-22 | 2023-10-27 | 湖南炬神电子有限公司 | Circuit for reducing PFC loss of high-power charger |
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| CN204465369U (en) * | 2014-06-26 | 2015-07-08 | 欧普照明股份有限公司 | Circuit of power factor correction carries auxiliary power circuit and control device thereof |
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| CN101742188A (en) * | 2009-12-31 | 2010-06-16 | 深圳创维－Rgb电子有限公司 | LCD (Liquid Crystal Display)-TV power supply voltage detection circuit |
| EP2713489A1 (en) * | 2012-09-27 | 2014-04-02 | Siemens Aktiengesellschaft | Method for low power operation of an active PFC converters using window modulation with open-loop width control |
| CN204465369U (en) * | 2014-06-26 | 2015-07-08 | 欧普照明股份有限公司 | Circuit of power factor correction carries auxiliary power circuit and control device thereof |
Also Published As
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|---|---|
| WO2015196672A1 (en) | 2015-12-30 |
| CN105450054A (en) | 2016-03-30 |
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