CN110492729A - A kind of circuit and Switching Power Supply optimizing Switching Power Supply PF value and THDI - Google Patents
A kind of circuit and Switching Power Supply optimizing Switching Power Supply PF value and THDI Download PDFInfo
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- CN110492729A CN110492729A CN201910712917.7A CN201910712917A CN110492729A CN 110492729 A CN110492729 A CN 110492729A CN 201910712917 A CN201910712917 A CN 201910712917A CN 110492729 A CN110492729 A CN 110492729A
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
The present invention relates to a kind of circuits and Switching Power Supply for optimizing Switching Power Supply PF value and THDI, comprising: receives rectifying and wave-filtering signal and generates the PFC boost circuit of PFC voltage signal and zero cross signal according to rectifying and wave-filtering signal；With PFC boost circuit connection, receive zero cross signal and to zero cross signal carry out detection processing, with export correction thermal compensation signal detecting circuit；It is connect with detecting circuit, the thermal compensation signal that generates with PFC control circuit of thermal compensation signal will be corrected be overlapped, to export the plural compensation circuit of superposed signal；And PFC control circuit；PFC control circuit is connect with PFC boost circuit and plural compensation circuit, for receiving PFC voltage signal, zero cross signal and superposed signal, and according to the output of PFC voltage signal, zero cross signal and superposed signal for the PF value of regulating switch power supply and the driving signal of THDI.The present invention can effectively optimize the PF value and THDI of Switching Power Supply, be applicable to different Switching Power Supply products, applied widely, practical.
Description
Technical field
The present invention relates to the technical field of Switching Power Supply, more specifically to a kind of optimization Switching Power Supply PF value and
The circuit and Switching Power Supply of THDI.
Background technique
The advantages of Switching Power Supply is with its high conversion efficiency small size, more and more electronic products are all made using Switching Power Supply
Power grid energy is maximally utilized in order to reduce the pollution to power grid for power supply unit, reduces reactive loss, professional standard is more next
It is higher, wherein the requirement to power factor (PF value) and current harmonics (THDI) is higher and higher.
Switch power supply power factor correction route substantially passes through following development process interim several times:
1, reactive factor corrects line switching power supply, and network voltage supplies Switching Power Supply conversion circuit after directly rectifying,
Due to the presence of smothing filtering capacitor, cause power factor very low (general 0.5-0.6), the high (total harmonic distortion of current harmonics
General 100% or more), input current peak value is than very big (generally arriving 3-4), and serious to electric network pollution, reactive loss is big；
2, passive type power factor correction line switching power supply, relatively common inductance type or capacitor valley fill type route,
Power factor can be optimized to 0.9 or more, and current total harmonic content to 30% or so, input current peak value ratio is generally to 2 or so；
3, active power factor correction line switching power supply detects input voltage waveform, core using active control chip
Piece control passive device (switching tube and inductance, diode etc.) makes input current waveform follow voltage waveform, using active
Power factor correction route control mode can make product power factor be increased to 0.95 or more, and current total harmonic content can drop to
Within 20%, input current peak value ratio can be accomplished within 1.5.Active power factor correction line work mode is according to output
PFC circuit output voltage can be divided into booster type, voltage-dropping type, buck-boost type, wherein the most universal with booster type route；Working method
It can be divided into continuous type (being generally used for 500 watts or more power stages) according to inductive current operating mode, critical type and interrupted type are (general
For 500 watts or less power sections), wherein critical type becomes mainstream to utilization rate and the transfer efficiency highest of circuit element with it
Route.Divided according to electric appliance quantity, wherein the Switching Power Supply of 500 watts or less power sections probably account for the 90% of city field ionization source sum with
On.So advanced optimizing for critical type PFC boost route has very big market value.
Conventional critical type control model route, due to depositing for the filter capacitor after the electromagnetic interface filter of input terminal and rectification
Phase shift to a certain extent can be being generated to output voltage signal, and input current waveform is caused to produce at ac zero-crossing point
Raw distortion, leads to PF value and THDI deterioration parameter.
Therefore, Yao Gaishan PF value and THDI are it is necessary to try every possible means to reduce or eliminate phase shift, when improving ac zero-crossing point
Input current abnormality.Method 1 is to reduce or remove X capacitor in EMI filter circuit and the filter capacitor after rectification (or electricity
Appearance group), in actual product research and development, this method improves the problem of bringing route Conduction Interference after PF value and THDI, institute
Not have market value.Method is second is that controlling below to compensating at zero crossing in route, to reduce front filter as far as possible
Capacitor bring negatively affects in swash road.
Partially there is THDI optimization function in existing PFC control chip, principle is that portion increases exchanges zero crossing in the chip
When driving service time compensate electric current platform when zero crossing to promote input current when ac zero-crossing point, to improve
THDI characteristic, but since chip interior compensating parameter is fixed, and each Switching Power Supply product external input terminals capacitance is not united
One, input voltage range also disunity causes this compensation way effect limited, ideal effect is not achieved.It is, thus, sought for
A kind of optimization route, to achieve the effect that effectively to optimize PF value and THDI.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of optimization switch electricity
The circuit and Switching Power Supply of source PF value and THDI.
The technical solution adopted by the present invention to solve the technical problems is: providing a kind of optimization Switching Power Supply PF value and THDI
Circuit, comprising:
It receives rectifying and wave-filtering signal and generates the PFC of PFC voltage signal and zero cross signal according to the rectifying and wave-filtering signal
Booster circuit；
With the PFC boost circuit connection, receive the zero cross signal and detection processing carried out to the zero cross signal, with
The detecting circuit of output correction thermal compensation signal；
It connect with the detecting circuit, carry out the thermal compensation signal that the correction thermal compensation signal and PFC control circuit generate
Superposition, to export the plural compensation circuit of superposed signal；And the PFC control circuit；
The PFC control circuit is connect with the PFC boost circuit and the plural compensation circuit, described for receiving
PFC voltage signal, the zero cross signal and the superposed signal, and according to the PFC voltage signal, the zero cross signal and institute
Superposed signal output is stated for the PF value of regulating switch power supply and the driving signal of THDI.
In one embodiment, the PFC boost circuit includes: PFC boost inductance and PFC diode；
The first end of the PFC boost inductance receives the rectifying and wave-filtering signal, and the second end of the PFC boost inductance connects
Connect the anode of the PFC diode, the third end ground connection of the PFC boost inductance, the 4th end connection of the PFC boost inductance
The input terminal of the detecting circuit and the PFC control circuit cross reset terminal, described in the cathode connection of the PFC diode
The test side PFC of PFC control circuit, and the PFC voltage signal is exported by the cathode of the PFC diode.
In one embodiment, further includes: the first output end and the PFC that the PFC boost circuit is arranged in control
Bleeder circuit between the test side PFC of circuit；
The bleeder circuit for carrying out voltage division processing to the PFC voltage signal, and exports voltage division signal to described
The test side PFC of PFC control circuit.
In one embodiment, the bleeder circuit includes: second resistance and 3rd resistor；
The first end of the second resistance connects the cathode of the PFC diode, the second end connection of the second resistance
The first end of the 3rd resistor, the second end ground connection of the 3rd resistor, the second end of the second resistance and the third
The connecting pin of the first end of resistance is also connected with the test side PFC of the PFC control circuit；
The connecting pin of the first end of the second end of the second resistance and the 3rd resistor exports the voltage division signal.
In one embodiment, the detecting circuit includes: detector diode and detection capacitor；
The anode of the detector diode connects the second output terminal of the PFC boost circuit, the detector diode
Cathode connects the first end of the detection capacitor, the second end ground connection of the detection capacitor；
The connecting pin of the first end of the cathode of the detector diode and the detection capacitor is additionally coupled to the compound benefit
Repay the input terminal of circuit；
The connecting pin of the first end of the cathode of the detector diode and the detection capacitor exports the correction compensation letter
Number.
In one embodiment, the plural compensation circuit includes: the 6th capacitor, the 6th resistance, the 4th resistance, third electricity
Hold and the 5th capacitor；
The first end of 6th capacitor connects the defeated of the detecting circuit as the input terminal of the plural compensation circuit
Outlet, the second end of the 6th capacitor connect the first end of the 6th resistance, and the second end of the 6th resistance connects institute
State the first end, the first end of the 5th capacitor and the thermal compensation signal test side of the PFC control circuit of the 4th resistance；
The second end of 4th resistance connects the first end of the third capacitor, the second end of the third capacitor and institute
State the second end ground connection of the 5th capacitor.
In one embodiment, the plural compensation circuit includes: the 6th capacitor, the 4th resistance, third capacitor and the 5th
Capacitor；
The first end of 6th capacitor connects the defeated of the detecting circuit as the input terminal of the plural compensation circuit
Outlet, the second end of the 6th capacitor connect the first end of the 4th resistance, the first end of the 5th capacitor and institute
State the thermal compensation signal test side of PFC control circuit；
The second end of 4th resistance connects the first end of the third capacitor, the second end of the third capacitor and institute
State the second end ground connection of the 5th capacitor.
In one embodiment, the plural compensation circuit includes: the 6th resistance, the 4th resistance, third capacitor and the 5th
Capacitor；
The first end of 6th resistance connects the defeated of the detecting circuit as the input terminal of the plural compensation circuit
Outlet, the second end of the 6th resistance connect the first end of the 4th resistance, the first end of the 5th capacitor and institute
State the thermal compensation signal test side of PFC control circuit；
The second end of 4th resistance connects the first end of the third capacitor, the second end of the third capacitor and institute
State the second end ground connection of the 5th capacitor.
In one embodiment, further includes: driving tube and pull down resistor；
The control terminal of the driving tube connects the driving signal output end of the PFC control circuit, and the of the driving tube
One end connects the anode of the PFC diode, and the second end of the driving tube is grounded by the pull down resistor；
The control terminal of the driving tube receives the driving signal of the PFC control circuit output, and is believed according to the driving
Number adjust the PF value and THDI of the Switching Power Supply.
The present invention also provides a kind of Switching Power Supplies, comprising: current rectifying and wave filtering circuit and above-described optimization Switching Power Supply
The circuit of PF value and THDI；
The input terminal of the current rectifying and wave filtering circuit receives AC signal, the output end of the current rectifying and wave filtering circuit with it is described excellent
Switching power PF value is connected with the input terminal of the circuit of THDI, for carrying out rectifying and wave-filtering processing to the AC signal, and
Output rectification filter signal to it is described optimization Switching Power Supply PF value and THDI circuit；The optimization Switching Power Supply PF value and THDI
Circuit according to the rectifying and wave-filtering signal output drive signal with the PF value and THDI of regulating switch power supply.
The circuit for implementing optimization Switching Power Supply PF value and THDI of the invention has the advantages that the optimization switchs
The circuit of power PF value and THDI include: receive rectifying and wave-filtering signal and according to rectifying and wave-filtering signal generate PFC voltage signal and
The PFC boost circuit of zero cross signal；With PFC boost circuit connection, receive zero cross signal and to zero cross signal carry out detection processing,
To export the detecting circuit of correction thermal compensation signal；It connect with detecting circuit, will correct what thermal compensation signal was generated with PFC control circuit
Thermal compensation signal is overlapped, to export the plural compensation circuit of superposed signal；And PFC control circuit；PFC control circuit with
PFC boost circuit is connected with plural compensation circuit, for receiving PFC voltage signal, zero cross signal and superposed signal, and according to
PFC voltage signal, zero cross signal and superposed signal output are for the PF value of regulating switch power supply and the driving signal of THDI.This hair
The bright PF value that can effectively optimize Switching Power Supply and THDI are applicable to different Switching Power Supply products, applied widely, practical
Property is strong.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the functional block diagram of optimization Switching Power Supply PF value provided in an embodiment of the present invention and the circuit of THDI；
Fig. 2 is the circuit diagram of optimization Switching Power Supply PF value provided in an embodiment of the present invention and the circuit of THDI；
Fig. 3 is the waveform diagram of rectifying and wave-filtering signal and driving signal of the present invention；
Fig. 4 is the waveform diagram of zero cross signal of the present invention；
Fig. 5 is the waveform diagram of rectified signal of the present invention；
Fig. 6 is the input voltage and current waveform figure before not improving；
Fig. 7 is the thermal compensation signal overlaid waveforms schematic diagram that present invention correction thermal compensation signal and PFC control circuit generate；
Fig. 8 is the waveform diagram of the input voltage and electric current after the present invention improves.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to solve the problems, such as that the present invention provides a kind of optimization Switching Power Supply PF existing for existing critical type control route
The circuit of value and THDI, the circuit can be compensated by working method of the external circuit to chip, to reach optimization switch
The PF value of power supply and the purpose of THDI.Wherein, the circuit of the optimization Switching Power Supply PF value and THDI can be applied to different type
Switching Power Supply, optimizing PF value and when THDI, not by the input end capacitor amount of different type Switching Power Supply and input voltage model
The influence enclosed can achieve good effect of optimization, applied widely.Further, the present invention optimize Switching Power Supply PF value and
The Switching Power Supply that the circuit of THDI is applicable in includes but is not limited to the power supply of the household electrical appliance such as LED drive power.
Specifically, with reference to Fig. 1, for the principle of optimization Switching Power Supply PF value provided in an embodiment of the present invention and the circuit of THDI
Block diagram.
As shown in Figure 1, the circuit of the optimization Switching Power Supply PF value and THDI include: to receive rectifying and wave-filtering signal and basis
The PFC boost circuit 11 of rectifying and wave-filtering signal generation PFC voltage signal and zero cross signal；It connect, receive with PFC boost circuit 11
Zero cross signal simultaneously carries out detection processing to zero cross signal, to export the detecting circuit 12 of correction thermal compensation signal；With detecting circuit 12
Connection will correct the thermal compensation signal that generates with PFC control circuit 14 of thermal compensation signal and be overlapped, to export the compound of superposed signal
Compensation circuit 13；And PFC control circuit 14；PFC control circuit 14 and PFC boost circuit 11 and plural compensation circuit 13 connect
It connects, believes for receiving PFC voltage signal, zero cross signal and superposed signal, and according to PFC voltage signal, zero cross signal and superposition
Number output for regulating switch power supply PF value and THDI driving signal.It is to be appreciated that passing through PFC voltage signal, zero passage
Signal and superposed signal can achieve the purpose of the control model of correction PFC control circuit 14, to control PFC control circuit
The driving signal of 14 outputs improves the purpose of PF value and THDI to reach optimization input current signal distortion distortion and phase shift.
Further, in the embodiment of the present invention, the circuit of the optimization Switching Power Supply PF value and THDI can also include: setting
Bleeder circuit 15 between the first output end of PFC boost circuit 11 and the test side PFC of PFC control circuit 14.Wherein, should
Bleeder circuit 15, for carrying out voltage division processing to PFC voltage signal, and the PFC for exporting voltage division signal to PFC control circuit 14 is examined
Survey end.
It is to be appreciated that since the PFC voltage signal that PFC boost circuit 11 is exported is up to volt or more more than 300, and
Chip in PFC control circuit 14 is unaffordable for such high pressure, so, when PFC control circuit 14 is needed to PFC liter
It when the PFC voltage signal that volt circuit 11 is exported is detected, needs first to carry out decompression processing, therefore, by the way that the partial pressure is arranged
Circuit 15 can achieve to PFC voltage signal carry out decompression processing purpose, and then by the voltage drop of PFC voltage signal down to
After the acceptable range of PFC control circuit 14, it is resent to the test side PFC of PFC control circuit 14.
Optionally, in the embodiment of the present invention, which can be realized by resistance, and due to PFC voltage signal
Voltage it is higher, therefore, used resistance is relatively high, to achieve the effect that really to reduce voltage.It is to be appreciated that
The particular number and resistance value of resistance used by the bleeder circuit 15 can require determination according to the partial pressure of actual circuit, and the present invention is not
Make specific limit.
It is illustrated below with circuit of the specific embodiment to optimization Switching Power Supply PF value and THDI of the invention.
As shown in Fig. 2, for the circuit theory of present invention optimization Switching Power Supply PF value and one preferred embodiment of circuit of THDI
Figure.
Specifically, as shown in Fig. 2, PFC boost circuit 11 includes: bis- pole PFC boost inductance L1 and PFC in the embodiment
Pipe D5.
The first end of PFC boost inductance L1 receives rectifying and wave-filtering signal, and the second end of PFC boost inductance L1 connects PFC bis-
The anode of pole pipe D5, the third end ground connection of PFC boost inductance L1, the 4th end connection detecting circuit 12 of PFC boost inductance L1
The reset terminal excessively of input terminal and PFC control circuit 14, the PFC detection of the cathode connection PFC control circuit 14 of PFC diode D5
End, and PFC voltage signal is exported by the cathode of PFC diode D5.
In the embodiment, bleeder circuit 15 includes: second resistance R2 and 3rd resistor R3.
The cathode of the first end connection PFC diode D5 of second resistance R2, the second end connection third electricity of second resistance R2
The first end of R3 is hindered, the second end of 3rd resistor R3 is grounded, the first end of the second end and 3rd resistor R3 of second resistance R2
Connecting pin is also connected with the test side PFC of PFC control circuit 14.Wherein, the of the second end of second resistance R2 and 3rd resistor R3
The connecting pin of one end exports voltage division signal.
Further, in the embodiment, detecting circuit 12 includes: detector diode D6 and detection capacitor C7.
The second output terminal of the anode connection PFC boost circuit 11 of detector diode D6, the cathode of detector diode D6 connect
Connect the first end of detection capacitor C7, the second end ground connection of detection capacitor C7；The cathode of detector diode D6 and detection capacitor C7's
The connecting pin of first end is additionally coupled to the input terminal of plural compensation circuit 13.Wherein, the cathode of detector diode D6 and detection electricity
Hold the connecting pin output correction thermal compensation signal of the first end of C7.
Further, as shown in Fig. 2, in the first embodiment, plural compensation circuit 13 includes: the 6th capacitor C6, the 6th electricity
Hinder R6, the 4th resistance R4, third capacitor C4 and the 5th capacitor C5.
Output end of the first end of 6th capacitor C6 as the input terminal connection detecting circuit 12 of plural compensation circuit 13, the
The second end of six capacitor C6 connects the first end of the 6th resistance R6, and the second end of the 6th resistance R6 connects the first of the 4th resistance R4
It holds, the thermal compensation signal test side of the first end of the 5th capacitor C5 and PFC control circuit 14.The second end of 4th resistance R4 connects
The first end of third capacitor C4, the second end of third capacitor C4 and the second end ground connection of the 5th capacitor C5.
It will of course be understood that ground, in some other embodiment, plural compensation circuit 13 may include: the 6th capacitor C6,
4th resistance R4, third capacitor C4 and the 5th capacitor C5.
Output end of the first end of 6th capacitor C6 as the input terminal connection detecting circuit 12 of plural compensation circuit 13, the
The second end of six capacitor C6 connects the first end of the 4th resistance R4, the first end of the 5th capacitor C5 and PFC control circuit 14
Thermal compensation signal test side；4th resistance R4 second end connection third capacitor C4 first end, the second end of third capacitor C4 and
The second end of 5th capacitor C5 is grounded.
Alternatively, plural compensation circuit 13 includes: the 6th resistance R6, the 4th resistance R4, third in some other embodiment
Capacitor C4 and the 5th capacitor C5.
Output end of the first end of 6th resistance R6 as the input terminal connection detecting circuit 12 of plural compensation circuit 13, the
The second end of six resistance R6 connects the first end of the 4th resistance R4, the first end of the 5th capacitor C5 and PFC control circuit 14
Thermal compensation signal test side；4th resistance R4 second end connection third capacitor C4 first end, the second end of third capacitor C4 and
The second end of 5th capacitor C5 is grounded.
I.e. in the embodiment of the present invention, the 6th capacitor C6 and the 6th resistance R6 in plural compensation circuit 13 can be deposited simultaneously
It can also increase and decrease according to actual needs adjustment only with one of them.
Further, as shown in Fig. 2, the circuit of optimization the Switching Power Supply PF value and THDI further include: driving tube M1 is under
Pull-up resistor R1.
The driving signal output end of the control terminal connection PFC control circuit 14 of driving tube M1, the first end of driving tube M1 connect
The anode of PFC diode D5 is connect, the second end of driving tube M1 is grounded by pull down resistor R1；The control terminal of driving tube M1 receives
The driving signal that PFC control circuit 14 exports, and according to the PF value and THDI of driving signal regulating switch power supply.
Further, PFC control circuit 14 includes that PFC controls chip, and it includes error amplifier that PFC, which controls chip, wherein
The test side PFC of PFC control circuit 14 is the FB pin of the error amplifier of the PFC control chip in Fig. 2, PFC control circuit
The 14 ZCD pin for crossing the error amplifier that reset terminal is the PFC control chip in Fig. 2, the compensation letter of PFC control circuit 14
Number test side is the COMP pin for the error amplifier that PFC in Fig. 2 controls chip, and the driving signal of PFC control circuit 14 is defeated
Outlet is the PFC-DRIVE pin of the error amplifier of the PFC control chip in Fig. 2.
As shown in Fig. 2, AC signal (alternating current) generates rectifying and wave-filtering letter after rectifier bridge rectifies, at the both ends of capacitor C1
Number, which is pulsating volage, which increases voltage after PFC inductance L1 and PFC diode D5
To preset electrical voltage point (i.e. PFC voltage signal), and pass through control driving tube M1's by the driving signal of PFC control chip output
Switch motion is inductive energy storage, wherein the waveform of driving signal and rectifying and wave-filtering signal is as shown in Figure 3.
In Fig. 3, dotted line is the pulsating volage that alternating current exports after over commutation, and solid line is according to alternating current input condition at one
The driving signal of driving tube M1 in ac cycle, the driving signal by PFC control chip according to zero cross signal (ZCD signal),
Voltage division signal and superposed signal determine.Meanwhile being synchronized in the auxiliary winding of PFC boost inductance L1 and generating zero cross signal all the way,
The zero cross signal is conveyed directly to the reset terminal excessively of PFC control chip, for detecting the afterflow situation of PFC boost inductance L1,
The zero cross signal has flyback characteristic, and specific waveform is as shown in Figure 4.
The characteristic that zero cross signal has envelope tendency synchronous with mains input voltage it can be seen from the waveform diagram of Fig. 4, because
Zero cross signal is passed through detector diode D6 using the envelope tendency of the zero cross signal characteristic synchronous with mains input voltage by this
With detection capacitor C7 detection, restores all the way with the fluctuating signal of rectifying and wave-filtering signal inversion (i.e. correction thermal compensation signal), have
Bulk wave shape is as shown in figure 5, the correction thermal compensation signal can be used for correcting the control model of compensation PFC control chip, to optimize input
Current signal distortion distortion and phase shift achieve the purpose that improve PF value and THDI.
In the embodiment, optimize the concrete operating principle of Switching Power Supply PF value and the circuit of THDI are as follows: zero cross signal passes through
The correction thermal compensation signal exported after detector diode D6 and detection capacitor C7 detection is by the 6th capacitor C6 and the 6th resistance R6 coupling
The COMP pin (compensation pin) of the error amplifier of PFC control chip is closed, which is that PFC controls chip interior
The output end of error amplifier, for meeting third capacitor C3, the 4th resistance R4 and the 5th capacitor C5, to improve error amplifier
Bandwidth of operation and phase compensation, to improve the stability of circuit, the thermal compensation signal of compensation pin output is a direct current signal
It is superimposed slight fluctuating signal, ripple frequency is 2 times that alternating current inputs frequency, with the pulsating volage frequency phase behind commercial power rectification
It can reflect charged bringing onto load situation Deng, the flip-flop in the thermal compensation signal, load more raw, then voltage is higher, while PFC
The duty ratio for controlling the driving signal of chip output is also higher.
Further, the correction thermal compensation signal after detection is coupled to PFC control by the 6th capacitor C6 and the 6th resistance R6
The COMP pin of the error amplifier of chip is superimposed with the thermal compensation signal of PFC control chip output, the electricity of the 6th capacitor C6 and the 6th
The plural compensation circuit 13 that R6 and third capacitor C3, the 4th resistance R4 and the 5th capacitor C5 are formed is hindered, in alternating current zero crossing part
The highest point of corresponding thermal compensation signal, combining superimposed superposed signal causes the thermal compensation signal test side of PFC control chip in city
Electric zero passage point moment has a control signal more higher than original signal, so that the driving signal of PFC control chip output
Duty ratio further increases, so that input current waveform be made also to have certain electric current input in zero crossing, improves input electricity
It flows through zero and narrows platform, to optimize THDI.
Further, correction thermal compensation signal can compensating phase shift to a certain extent, and due to the multiple capacitors of input terminal
In the presence of, cause entirely to load inclined capacitive, makes the slight leading voltage waveform of current waveform, and the addition of new zero cross signal, so that
After passing through alternating current zero crossing, as input signal sine rises, the correction thermal compensation signal opposite direction sine after detection declines,
This decline tendency can be added to PFC control chip error amplifier COMP pin, control input current in advance climb away
Gesture is then compensated to opposite direction after sinusoidal an angle of 90 degrees；As input signal sine declines, the correction thermal compensation signal after detection
Opposite direction sine rise, this ascending tendency can be added to PFC control chip error amplifier COMP pin, control input electricity
The advanced decline tendency of stream, it is comprehensive so that advanced current signal is pushed through smaller phase shift angle, so as to improve PF value.
With reference to Fig. 6, Fig. 7 and Fig. 8, dotted line is input current (AC-I) waveform, solid line input voltage (AC-V) wave in Fig. 6
Shape；In Fig. 7, dotted line is correction thermal compensation signal (COMP1), and solid line is the compensation for the error amplifier output that PFC is controlled in chip
Signal (COMP)；In Fig. 8, dotted line is input current (AC-I) waveform, solid line input voltage (AC-V) waveform.By can be in Fig. 8
Find out, the present invention pass through combined compensation after can effective compensation zero crossing when electric current platform, improve the THDI characteristic of input current.
Further, the present invention extracts instead from the flyback sinusoidal envelope signal of the auxiliary winding of PFC boost inductance L1
The mutually zero cross signal of the rectifying and wave-filtering signal behind commercial power rectification, the zero cross signal export correction thermal compensation signal after detection,
The correction thermal compensation signal be added to by way of capacitance-resistance PFC control chip error amplifier COMP pin, pass through promotion
The method of the driving signal signal dutyfactor of driving tube M1, reaches and improves PF value and reduction input current when exchange input zero crossing
The purpose of harmonic content, and dynamic regulation PFC controls the COMP of the error amplifier of chip by way of reverse phase sine amplitude sample
The method of the signal of pin improves the mode of AC input current and voltage difference, improves PF value and reduction Harmonics of Input contains
Amount.
Further, the present invention also provides a kind of Switching Power Supply, which includes: current rectifying and wave filtering circuit and this hair
The circuit of the disclosed optimization Switching Power Supply PF value and THDI of bright embodiment.
The input terminal of the current rectifying and wave filtering circuit receives AC signal, the output end of the current rectifying and wave filtering circuit with it is described excellent
Switching power PF value is connected with the input terminal of the circuit of THDI, for carrying out rectifying and wave-filtering processing to the AC signal, and
Output rectification filter signal to it is described optimization Switching Power Supply PF value and THDI circuit；The optimization Switching Power Supply PF value and THDI
Circuit according to the rectifying and wave-filtering signal output drive signal with the PF value and THDI of regulating switch power supply.
Specifically, current rectifying and wave filtering circuit is as shown in Figure 2, comprising: diode D1, diode D2, diode D3 and two poles
The rectifier bridge and filter capacitor C1 of pipe D4 composition.AC signal (alternating current) is after rectifier bridge rectifies, filter capacitor C1's
Both ends generate rectifying and wave-filtering signal, the rectifying and wave-filtering signal by PFC boost inductance L1 be input to optimization Switching Power Supply PF value and
The circuit of THDI.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of circuit for optimizing Switching Power Supply PF value and THDI characterized by comprising
It receives rectifying and wave-filtering signal and generates the PFC boost of PFC voltage signal and zero cross signal according to the rectifying and wave-filtering signal
Circuit；
With the PFC boost circuit connection, receive the zero cross signal and detection processing carried out to the zero cross signal, with output
Correct the detecting circuit of thermal compensation signal；
It connect with the detecting circuit, be overlapped the thermal compensation signal that the correction thermal compensation signal is generated with PFC control circuit,
To export the plural compensation circuit of superposed signal；And the PFC control circuit；
The PFC control circuit is connect with the PFC boost circuit and the plural compensation circuit, for receiving the PFC electricity
Press signal, the zero cross signal and the superposed signal, and according to the PFC voltage signal, the zero cross signal and described folded
Plus signal output is for the PF value of regulating switch power supply and the driving signal of THDI.
2. the circuit of optimization Switching Power Supply PF value and THDI according to claim 1, which is characterized in that the PFC boost
Circuit includes: PFC boost inductance and PFC diode；
The first end of the PFC boost inductance receives the rectifying and wave-filtering signal, and the second end of the PFC boost inductance connects institute
The anode of PFC diode is stated, the third end of the PFC boost inductance is grounded, described in the 4th end connection of the PFC boost inductance
The reset terminal excessively of the input terminal of detecting circuit and the PFC control circuit, the cathode of the PFC diode connect the PFC
The test side PFC of control circuit, and the PFC voltage signal is exported by the cathode of the PFC diode.
3. the circuit of optimization Switching Power Supply PF value and THDI according to claim 2, which is characterized in that further include: setting
Bleeder circuit between the first output end of the PFC boost circuit and the test side PFC of the PFC control circuit；
The bleeder circuit for carrying out voltage division processing to the PFC voltage signal, and exports voltage division signal and controls to the PFC
The test side PFC of circuit processed.
4. the circuit of optimization Switching Power Supply PF value and THDI according to claim 3, which is characterized in that the bleeder circuit
It include: second resistance and 3rd resistor；
The first end of the second resistance connects the cathode of the PFC diode, described in the second end connection of the second resistance
The first end of 3rd resistor, the second end ground connection of the 3rd resistor, the second end of the second resistance and the 3rd resistor
The connecting pin of first end be also connected with the test side PFC of the PFC control circuit；
The connecting pin of the first end of the second end of the second resistance and the 3rd resistor exports the voltage division signal.
5. the circuit of optimization Switching Power Supply PF value and THDI according to claim 1, which is characterized in that the detecting circuit
It include: detector diode and detection capacitor；
The anode of the detector diode connects the second output terminal of the PFC boost circuit, the cathode of the detector diode
Connect the first end of the detection capacitor, the second end ground connection of the detection capacitor；
The connecting pin of the first end of the cathode of the detector diode and the detection capacitor is additionally coupled to the combined compensation electricity
The input terminal on road；
The connecting pin of the first end of the cathode of the detector diode and the detection capacitor exports the correction thermal compensation signal.
6. the circuit of optimization Switching Power Supply PF value and THDI according to claim 1, which is characterized in that the combined compensation
Circuit includes: the 6th capacitor, the 6th resistance, the 4th resistance, third capacitor and the 5th capacitor；
The first end of 6th capacitor connects the output end of the detecting circuit as the input terminal of the plural compensation circuit,
The second end of 6th capacitor connects the first end of the 6th resistance, the second end connection the described 4th of the 6th resistance
The thermal compensation signal test side of the first end of resistance, the first end of the 5th capacitor and the PFC control circuit；
The second end of 4th resistance connects the first end of the third capacitor, the second end of the third capacitor and described
The second end of five capacitors is grounded.
7. the circuit of optimization Switching Power Supply PF value and THDI according to claim 1, which is characterized in that the combined compensation
Circuit includes: the 6th capacitor, the 4th resistance, third capacitor and the 5th capacitor；
The first end of 6th capacitor connects the output end of the detecting circuit as the input terminal of the plural compensation circuit,
The second end of 6th capacitor connects the first end of the 4th resistance, the first end of the 5th capacitor and the PFC
The thermal compensation signal test side of control circuit；
The second end of 4th resistance connects the first end of the third capacitor, the second end of the third capacitor and described
The second end of five capacitors is grounded.
8. the circuit of optimization Switching Power Supply PF value and THDI according to claim 1, which is characterized in that the combined compensation
Circuit includes: the 6th resistance, the 4th resistance, third capacitor and the 5th capacitor；
The first end of 6th resistance connects the output end of the detecting circuit as the input terminal of the plural compensation circuit,
The second end of 6th resistance connects the first end of the 4th resistance, the first end of the 5th capacitor and the PFC
The thermal compensation signal test side of control circuit；
The second end of 4th resistance connects the first end of the third capacitor, the second end of the third capacitor and described
The second end of five capacitors is grounded.
9. the circuit of optimization Switching Power Supply PF value and THDI according to claim 2, which is characterized in that further include: driving
Pipe and pull down resistor；
The control terminal of the driving tube connects the driving signal output end of the PFC control circuit, the first end of the driving tube
The anode of the PFC diode is connected, the second end of the driving tube is grounded by the pull down resistor；
The control terminal of the driving tube receives the driving signal of the PFC control circuit output, and according to the driving signal tune
Save the PF value and THDI of the Switching Power Supply.
10. a kind of Switching Power Supply characterized by comprising current rectifying and wave filtering circuit and claim 1-9 are described in any item excellent
The circuit of Switching power PF value and THDI；
The input terminal of the current rectifying and wave filtering circuit receives AC signal, and the output end of the current rectifying and wave filtering circuit is opened with the optimization
It closes power PF value to connect with the input terminal of the circuit of THDI, for carrying out rectifying and wave-filtering processing to the AC signal, and export
Rectifying and wave-filtering signal to it is described optimization Switching Power Supply PF value and THDI circuit；The electricity of optimization the Switching Power Supply PF value and THDI
Road is according to the rectifying and wave-filtering signal output drive signal with the PF value and THDI of regulating switch power supply.
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| CN113872430A (en) * | 2021-09-13 | 2021-12-31 | 珠海格力电器股份有限公司 | Power factor correction circuit, current zero-crossing distortion suppression method thereof and air conditioner |
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