CN106341038A - Constant voltage output switching power supply device with high power factor and control method thereof - Google Patents
Constant voltage output switching power supply device with high power factor and control method thereof Download PDFInfo
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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
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- 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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- 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
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Abstract
The invention discloses a constant voltage output switching power supply with a high power factor, which is composed of a rectifying and filtering circuit, a power converter, a control circuit, an output voltage feedback circuit, an inductive current zero-crossing feedback circuit and a chip power supply circuit. The constant voltage output switching power supply is characterized in that alternating current is inputted and converted into direct current through the rectifying and filtering circuit, the direct current is inputted into the power converter, the direct current is outputted to a load circuit from the power converter, then detection is carried out on a main power circuit through the output voltage feedback circuit, the inductive current zero-crossing feedback circuit and the chip power supply circuit, an acquired result is inputted into the control circuit so as to enable the control circuit to operate and obtain a control scheme, and output of the control circuit is transmitted to the power converter so as to perform control on the power converter. According to the constant voltage output power supply system with a high power factor, the turn-on time of a power switch tube is controlled to be constant through design of the control circuit and the feedback circuit; constant voltage output can be achieved in a full voltage range, and a high power factor can be ensured.
Description
Technical field
The present invention relates to switch power technology field, particularly to a kind of constant voltage output power supply device and its control circuit.
Technical background
Power factor for the Switching Power Supply of incoming transport electrical network has certain requirement, because if power factor is not, then
Electrical network can be caused with a certain degree of pollution.Iec International Electrotechnical Commission proposes clear and definite harmonic requirement to lighting, that is,
Iec61000-3-2 standard.From the point of view of actual applicable cases, the requirement to power factor is higher than mostly the regulation of standard.
The immediate prior art of the present invention: publication number: cn102290997a, publication date: 2011-12-21, a kind of title: switch
The constant-voltage output control circuit of power-supply controller of electric and Switching Power Supply, provide a kind of constant-voltage output control circuit of switch power controller
And Switching Power Supply, increased Isobarically Control module inside the controller of Switching Power Supply, by by the voltage of controller fb with set
Second reference voltage is compared, and controls the voltage at the vcc end of controller repeatedly to open shutoff, thus controlling switch power output end
Voltage.Publication number: cn102904431a, publication date: 2013-01-30, title: a kind of Switching Power Supply and its constant voltage output
Controller, the present invention pass through in Switching Power Supply using include starting module, voltage comparison module, reference voltage generation module,
The constant voltage output controller of power switch, voltage sample amplification module and pulse width modulation module, simplifies the circuit structure of Switching Power Supply,
Reduce cost, can reliablely and stablely output voltage property performance period of output stage load driving circuits be modulated with to negative simultaneously
Load realizes constant voltage output, solves the stability of a system and complex and high cost the asking of poor reliability, circuit structure of prior art presence
Topic.
, in use, requiring that output voltage output voltage in full voltage range is constant, voltage regulation result is good, has for constant voltage Switching Power Supply
Beneficial to security of system and reliability.The present invention provides a kind of High Power Factor constant voltage output switching electric power source device.
Content of the invention
Technical scheme is as follows:
1. a kind of High Power Factor constant voltage output switch power source, its composition includes: current rectifying and wave filtering circuit, power inverter, control circuit,
Output voltage feedback circuit, inductive current zero passage feedback circuit, chip power supply circuit it is characterised in that: alternating current input after pass through
One current rectifying and wave filtering circuit converts alternating current to direct current, and direct current is then input in power inverter, defeated from power inverter
Go out in load circuit, then pass through output voltage feedback circuit, inductive current zero passage feedback circuit, these three electricity of chip power supply circuit
Road is detected to main power circuit, and the result obtaining is input in control circuit and is allowed to work and draws control program, then by controlling
The output of circuit processed is transferred to power inverter and controls it, as shown in Figure 1.
2. control circuit includes seven input/output terminals, is vcc, gnd, cs, fb, zcd, comp and out, wherein vcc respectively
It is the power end of power supply circuits, gnd is the earth terminal of power supply circuits, cs is power switch pipe current sample input, is used for
Stream protection, fb is feedback voltage signal input, and zcd is inductive current zero passage detection input, and comp controls for ON time
Voltage output end, out is driving signal of power switching tube output end, as shown in Figure 2.
3. Switching Power Supply according to claim 1 it is characterised in that: power inverter (2) using buck circuit topology or changes
Enter buck circuit topology or the flyback circuit topological structure of type.
4. a kind of buck circuit topology of power inverter, a uncontrollable rectifier bridge bd1 and filter capacitor are passed through in exchange input
Cin is converted into direct current, is connected to one afterwards by mosfet switching tube q1, inductance l1, diode d1 and output capacitance cout
In the typical buck circuit of composition, the direct current above inputting is carried out with the step-down conversion of DC-to-DC and realizes power factor
Calibration function；Simultaneously in order to be connected with control, resistance r3, r4, r5, r6, diode d3 and electric capacity c3 constitute output electricity
Pressure feedback circuit, wherein r4 plays metering function, and d3 and c3 constitutes the control circuit of a voltage output, on c3 when stablizing
Voltage swing is equal in magnitude with output voltage, and then can thus produce change feedback output when unstable in the chip of control circuit
Go, output voltage values are then transmitted directly to the input as switch controlling signal in control circuit by r3, then defeated by control circuit
Go out control signal come controlling switch pipe q1 open and turn off to make output voltage stabilization with this, and the power supply of control circuit chips
Circuit is made up of r1, c1, r2 and d2, and wherein r1 provides voltage and current in the circuit start stage to chip for starting resistance,
R2, d2 maintain chip operating voltage electric current when power switch pipe turns off to chip power supply, and c1 is filter capacitor, play stable
The effect of chip power supply voltage；Rcs is then the less resistance of resistance, to carry out for inductive current is converted into magnitude of voltage
Sampling, as shown in Figure 3.
5. a kind of follow-on buck circuit topology of power inverter, a uncontrollable rectifier bridge bd1 and filter are passed through in exchange input
Ripple electric capacity cin is converted into direct current, is connected to one afterwards by inductance l1, diode in mosfet switching tube q1, transformer t1
In the typical buck circuit of d1 and output capacitance cout composition, the step-down carrying out DC-to-DC to the direct current above inputting turns
Change and realize power factor emendation function；Simultaneously in order to be connected with control, resistance r3, r4, r5, r6, diode d3,
Electric capacity c3 and transformer t1 constitutes output voltage feedback circuit, and wherein t1 is used as sampled voltage by converted for output voltage values,
The effect of isolation can be played, r4 plays metering function, and d3 and c3 constitutes the control circuit of a voltage output, on c3 when stablizing
Voltage swing is equal in magnitude with output voltage, and then can thus produce change feedback output when unstable in the chip of control circuit
Go, output voltage values are then transmitted directly to the input as switch controlling signal in control circuit by r3, then defeated by control circuit
Go out control signal come controlling switch pipe q1 open and turn off to make output voltage stabilization with this,；And the confession of control circuit chips
Circuit is made up of r1, c1, r2 and d2, and wherein r1 provides operating voltage electricity in the circuit start stage to chip for starting resistance
Stream, r2, d2 maintain chip operating voltage electric current when power switch pipe turns off to chip power supply, and c1 is filter capacitor, plays
Stablize the effect of chip power supply voltage；Rcs is then the less resistance of resistance, for inductive current is converted into magnitude of voltage
Sampled, as shown in Figure 4.
6. the flyback circuit topology of power inverter, a uncontrollable rectifier bridge bd1 and filter capacitor cin is passed through in exchange input
It is converted into direct current, be connected to one afterwards by mosfet switching tube q1, transformer t1, diode d1 and output capacitance cout
In the flyback circuit of composition, the direct current above inputting is carried out with the step-down conversion of DC-to-DC and realizes power factor
Calibration function；Simultaneously in order to be connected with control, resistance r3, r4, r5, r6, diode d3, electric capacity c3 and transformer t1
Constitute output voltage feedback circuit, wherein t1 by converted for the output voltage values effect being used as sampled voltage, isolation being played,
R4 plays metering function, and d3 and c3 constitutes the control circuit of a voltage output, voltage swing and output voltage on c3 when stablizing
Equal in magnitude, and then can thus produce change feedback output when unstable in the chip of control circuit, r3 is then by output voltage
Value is transmitted directly to the input in control circuit as switch controlling signal, then to be controlled out by control circuit output control signal
Pass pipe q1 opens and turns off to make output voltage stabilization with this,；And the power supply circuits of control circuit chips are by r1, c1, r2
And d2 is constituted, wherein r1 provides voltage and current in the circuit start stage to chip for starting resistance, and r2, d2 open in power
Close when pipe turns off to chip power supply, maintain chip operating voltage electric current, c1 is filter capacitor, plays stable chip power supply voltage
Effect；Rcs is then the less resistance of resistance, is sampled for inductive current is converted into magnitude of voltage, as Fig. 5 institute
Show.
7. the control method of Switching Power Supply is as follows:
1) output voltage feedback signal is input to error signal amplification circuit, produces error with control circuit internal voltage reference after comparing
Signal, to control constant on-time with this, to meet the requirement of constant voltage output and High Power Factor；
2) switching tube is controlled to turn off, when inductor current value quilt when power switch tube current exceedes certain value or ON time reaches required value
Detect and during zero crossing, control switching tube conducting, make system be operated in critical conduction mode；
3) error amplifying circuit reference voltage and inductive current zero passage detection benchmark electricity are produced through reference voltage generating circuit by input voltage
Pressure etc.；
4) shutoff of switching tube and the control of turn-on instant drive external power switch pipe to open and close by power switch driver circuit
Disconnected.
The present invention has a following technical advantage:
High Power Factor constant voltage out-put supply system described in the embodiment of the present invention, by the design of control circuit and feedback circuit, controls
The ON time making described power switch pipe is constant；Can reach constant voltage output and guarantee high power factor in full voltage range.
High Power Factor constant voltage out-put supply system described in the embodiment of the present invention, by the feedback of output voltage, controls output voltage
Constant.Specifically, when output voltage is higher than design voltage, voltage feedback signal increases, and amplifies through the error of control circuit
The control voltage controlling switch pipe ON time producing after circuit declines, and makes output voltage drop to design load；When output voltage is low
When design voltage, voltage feedback signal reduces, and the control voltage producing after the error amplifying circuit of control circuit controls to be opened
Closing pipe ON time increases, and makes output voltage bring up to design load.It is achieved in constant voltage output.
Brief description
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or prior art
In description the accompanying drawing of required use do simple introduce it should be apparent that, drawings in the following description are only during the application records
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is that High Power Factor constant voltage output switching electric power source device forms structured flowchart；
Fig. 2 is the structural representation of the embodiment of the present application control circuit；
Fig. 3 is the circuit topology figure of buck converter；
Fig. 4 is the improved circuit topological diagram of buck converter；
Fig. 5 is the circuit topology figure of flyback converter；
Fig. 6 is the input voltage and input current waveform diagram of buck circuit and modified buck circuit；
Fig. 7 is the input voltage and input current waveform diagram of flyback circuit
Fig. 8 is the key point oscillogram of Switching Power Supply.
Wherein: 1: current rectifying and wave filtering circuit；2: power inverter；3: control circuit；4: output voltage feedback circuit；5: inductance electricity
Flow through zero feedback circuit；6: chip power supply circuit；7: generating circuit from reference voltage；8: error signal amplification circuit；9: switch
Pipe disconnects moment control circuit；10: power switch driver circuit；11: inductive current zero cross detection circuit；12: switching tube is opened
Logical moment control circuit
Specific embodiment
Below according to drawings and Examples, the present invention is described in further details:
As shown in figure 1, a kind of present invention High Power Factor constant voltage output switch power source includes current rectifying and wave filtering circuit, power inverter,
Output voltage feedback circuit, inductive current zero passage feedback circuit, chip power supply circuit and control circuit.
Current rectifying and wave filtering circuit includes rectifier bridge and input filter capacitor, for AC-input voltage is carried out rectification, filtering, rectification
Filtered voltage is half-sinusoid.
Power inverter is used for alternating voltage to be transformed into DC constant voltage output voltage, realizes power factor emendation function simultaneously.
Output voltage feedback circuit is used for sampling and outputting voltage as the voltage feedback signal of control circuit, for constant voltage output control
Control with power switch pipe ON time.
Inductance zero cross detection circuit is used for detecting inductive current zero-acrross ing moment, for controlling opening of power switch pipe in power inverter
In the logical moment, power inverter is made to be operated in critical conduction mode.
Chip power supply circuit is used for providing the operating voltage needing and electric current to control circuit.
Control circuit accepts voltage feedback circuit, the signal of inductive current zero passage feedback circuit, controls power inverter switching tube
Open and turn off to realize the functions such as constant voltage output, High Power Factor, overcurrent protection, open-circuit-protection.
Fig. 2 gives the structural representation of control circuit it is seen that control circuit includes seven input/output terminals, be respectively vcc,
Gnd, cs, fb, zcd, comp and out.Wherein vcc is the power end of power supply circuits；Gnd is the earth terminal of power supply circuits；
Cs is power switch pipe current sample input, for overcurrent protection；Fb is feedback voltage signal input；Zcd is inductance electricity
Flow through zero detection input；Comp is ON time control voltage output end；Out is driving signal of power switching tube output end.
In addition control circuit includes current foldback circuit, error signal amplification circuit, switching tube disconnection moment control circuit, inductance
Current over-zero testing circuit, switching tube open moment control circuit, power switch driver circuit, reference voltage generating circuit.Its
Middle current foldback circuit is used for detecting the electric current of power switch pipe, and when its electric current exceedes certain value, controlling switch pipe turns off, and rises
Effect to overcurrent protection and short-circuit protection；Error signal amplification circuit accepts output voltage feedback signal, inside control circuit
Voltage reference compare after produce error signal, to control constant on-time, with meet constant voltage output and High Power Factor will
Ask；Switching tube disconnects moment control circuit and is detecting that power switch tube current exceedes certain value or ON time reaches required value time control
Switching tube processed turns off；Inductive current zero cross detection circuit is used for detecting inductive current zero-acrross ing moment, opens with switching tube and constantly controls
Circuit cooperation controlling switch pipe is open-minded, makes system be operated in critical conduction mode；Power switch driver circuit is used for driving external work(
Rate switching tube turns on and off.Reference voltage generating circuit is used for producing control circuit internal reference voltage, amplifies electricity including error
Road reference voltage and inductive current zero passage detection reference voltage etc..
Fig. 3 is the specific embodiment that the present invention is applied to buck circuit.
Rectifier bridge bd1 and input filter capacitor cin forms current rectifying and wave filtering circuit.For rectification, filter are carried out to AC-input voltage
Ripple, after rectifying and wave-filtering, voltage waveform is half-sinusoid；Q1, d1, l1 and cout constitute buck converter, for by alternating voltage
It is transformed into DC constant voltage output voltage and realize power factor emendation function；R4, r5, r6, d3 and c3 constitute output voltage feedback electricity
Metering function is played on road, wherein r4, and d3 becomes direct current signal with c3 voltage feedback signal rectifying and wave-filtering, voltage on c3 when stablizing
Size is equal in magnitude with output voltage；R1, c1, r2 and d2 constitute chip power supply circuit, and wherein r1 is to start resistance in circuit
Startup stage provides voltage and current to chip, and r2, d2 maintain chip operation when power switch pipe turns off to chip power supply
Voltage x current, c1 is filter capacitor, plays the effect of stable chip power supply voltage；R3 constitutes inductive current zero passage feedback circuit.
When described power switch pipe is opened, inductive current is linearly increasing.Power switch pipe service time is produced by control circuit
Control voltage is determining.Inductive current peak is given by equation below:
Ipp (t)=(1.414*vin* | sin (2 π ft) |-vo) * ton/l；
Wherein, vin is the virtual value of input ac voltage, and f is the frequency of input ac voltage, and vo is described output voltage values,
L is the inductance value of described inductance, and ton is the ON time of described power switch pipe.
Due to i*l=vo*toff, then toff=ipp (t) * l/vo
The mean value of input current is iavg=ipp (t) * ton/2/ (ton+toff)
Abbreviation obtains iavg=vo*ton* (1-vo/ (1.414*vin*sin (2 π ft)))/2/l, (1.414*vin*sin (2 π
Ft) ＞ vo)
By above formula it can be seen that input current average value, close to sinusoidal, plays the purpose improving power factor.
When described power switch pipe turns off, just, voltage magnitude is vo+vd, and vd is the conducting of d1 on the inductance l1 voltage left negative right side
Pressure drop, electric capacity c3 plays filtering voltage regulation effect, and the voltage after c3 filtering voltage regulation is vo, then through r5, r6 partial pressure
Obtain the Voltage Feedback input that feedback voltage signal is input to control circuit afterwards.Control circuit is produced according to output voltage feedback signal
A raw ON time control voltage, maintains the constant of output voltage.Specific: when output voltage is higher than design voltage, electricity
Pressure feedback signal increases, and the control voltage controlling switch pipe ON time producing after the error amplifying circuit of control circuit declines,
Output voltage is made to drop to design load；When output voltage is less than design voltage, voltage feedback signal reduces, through control circuit
Error amplifying circuit after produce control voltage controlling switch pipe ON time increase, make output voltage bring up to design load.By
This realizes constant voltage output.
Inductive current zero passage feedback circuit need to connect one between the inductive current zero passage detection input of output end and control circuit
Resistance r3, this resistance plays metering function, and when switching tube turns off, inductance l1 electric current reduces, and inductive current zero passage detection is defeated
Entering terminal voltage is high level, and when the electric current flowing through in inductance l1 is reduced to 0, induced voltage thereon is 0.Therefore, when this is defeated
Enter end and voltage is detected when high level is to low level saltus step, represent inductive current zero passage, now make switching tube open-minded.
Fig. 4 is the another specific embodiment that the present invention is applied to buck circuit.
Rectifier bridge bd1 and input filter capacitor cin forms current rectifying and wave filtering circuit.For rectification, filter are carried out to AC-input voltage
Ripple, after rectifying and wave-filtering, voltage waveform is half-sinusoid；Q1, d1, t1 and cout constitute buck converter, for by alternating voltage
It is transformed into DC constant voltage output voltage and realize power factor emendation function；R4, r5, r6, d3 and c3 constitute output voltage feedback electricity
Metering function is played on road, wherein r4, and d3 becomes direct current signal with c3 voltage feedback signal rectifying and wave-filtering, voltage on c3 when stablizing
Size is equal in magnitude with output voltage；R1, c1, r2 and d2 constitute chip power supply circuit, and wherein r1 is to start resistance in circuit
Startup stage provides voltage and current to chip, and r2, d2 maintain chip operation when power switch pipe turns off to chip power supply
Voltage x current, c1 is filter capacitor, plays the effect of stable chip power supply voltage；R3 constitutes inductive current zero passage feedback circuit.
When described power switch pipe is opened, inductive current is linearly increasing.Power switch pipe service time is produced by control circuit
Control voltage is determining.Inductive current peak is given by equation below:
Ipp (t)=(1.414*vin* | sin (2 π ft) |-vo) * ton/l；
Wherein, vin is the virtual value of input ac voltage, and f is the frequency of input ac voltage, and vo is described output voltage values,
L is the former limit inductance value of described transformer t1, and ton is the ON time of described power switch pipe.
Due to i*l=vo*toff, then toff=ipp (t) * l/vo
The mean value of input current is iavg=ipp (t) * ton/2/ (ton+toff)
Abbreviation obtains iavg=vo*ton* (1-vo/ (1.414*vin*sin (2 π ft)))/2/l, (1.414*vin*sin (2 π
Ft) ＞ vo)
By above formula it can be seen that input current average value, close to sinusoidal, plays the purpose improving power factor.
When described power switch pipe turns off, a transformer t1 primary side winding voltage left side is just right negative, and voltage magnitude is vo+vd, and vd is
The conduction voltage drop of d1.Just, electric capacity c3 plays filtering voltage regulation effect, through d3 rectification and c3 on the vice-side winding induced voltage left negative right side
Voltage after filtering voltage regulation is vo/n, and n is the ratio of t1 primary and secondary side umber of turn, then after r5, r6 partial pressure
It is input to the feedback input end of control circuit to feedback voltage signal.Control circuit produces one according to output voltage feedback signal and leads
Logical time control voltage, maintains the constant of output voltage.Specific: when output voltage is higher than design voltage, Voltage Feedback is believed
Number increase, after the error amplifying circuit of control circuit produce control voltage controlling switch pipe ON time decline, make output
Voltage drops to design load；When output voltage is less than design voltage, voltage feedback signal reduces, through the error of control circuit
The control voltage controlling switch pipe ON time producing after amplifying circuit increases, and makes output voltage bring up to design load.It is achieved in
Constant voltage exports.
Inductive current zero passage feedback circuit need to the inductive current zero passage detection input of the auxiliary winding side of t1 and control circuit it
Between connect a resistance r3, this resistance plays metering function, and when switching tube turns off, t1 primary side winding electric current reduces, and inductance is electric
Flowing through zero detection input voltage is high level, and when the electric current flowing through in t1 primary side winding is reduced to 0, induced voltage thereon is
0.Therefore, when this input detect voltage from high level to low level saltus step when, represent inductive current zero passage, now make out
Close pipe open-minded.
Fig. 5 is the specific embodiment that the present invention is applied to flyback circuit.
Rectifier bridge bd1 and input filter capacitor cin forms current rectifying and wave filtering circuit.For rectification, filter are carried out to AC-input voltage
Ripple, after rectifying and wave-filtering, voltage waveform is half-sinusoid；Q1, d1, t1 and cout constitute flyback converter, for exchanging
Voltage transformation becomes DC constant voltage output voltage and realizes power factor emendation function；It is anti-that r4, r5, r6, d3 and c3 constitute output voltage
Current feed circuit, wherein r4 play metering function, and d3 and c3 plays rectifying and wave-filtering effect, and on c3 when stablizing, voltage swing is vo/n, n
The turn ratio for transformer assists winding ns1 and assists winding ns2；R1, c1, r2 and d2 constitute chip power supply circuit, wherein
R1 provides voltage and current in the circuit start stage to chip for starting resistance, and r2, d2 are when power switch pipe turns off to chip
Power supply, maintains chip operating voltage electric current, and c1 is filter capacitor, plays the effect of stable chip power supply voltage；R3 constitutes inductance
Current over-zero feedback circuit.
When described power switch pipe is opened, transformer primary side inductive current is linearly increasing.Power switch pipe service time is by controlling
The control voltage that circuit produces is determining.Inductive current peak is given by equation below:
Ipp (t)=1.414*vin* | sin (2 π ft) |/l*ton；
Wherein, vin is the virtual value of input ac voltage, and f is the frequency of input ac voltage, and vo is described output voltage values,
L is the inductance value of described inductance, and ton is the ON time of described power switch pipe.
Due to i*l=vo*toff, then toff=ipp (t) * l/vo
The mean value of input current is iavg=ipp (t) * ton/2/ (ton+toff)
A cycle internal inductance current maxima is ipeak=1.414*vin*ton/l.
Abbreviation obtains iavg=ipeak/2* | sin (2 π ft) |/((1+1.414*vin* | sin (2 π ft) |/(n*vo))
By above formula it can be seen that input current average value, close to sinusoidal, plays the purpose improving power factor.
When described power switch pipe turns off, a transformer t1 primary side winding voltage left side is just right negative, and voltage magnitude is vo+vd, and vd is
The conduction voltage drop of d1.Just, electric capacity c3 plays filtering voltage regulation effect, through d3 rectification and c3 on the vice-side winding induced voltage left negative right side
Voltage after filtering voltage regulation is vo/n, and n is the ratio of t1 primary and secondary side umber of turn, then after r5, r6 partial pressure
It is input to the feedback input end of control circuit to feedback voltage signal.Control circuit produces one according to output voltage feedback signal and leads
Logical time control voltage, maintains the constant of output voltage.Specific: when output voltage is higher than design voltage, Voltage Feedback is believed
Number increase, after the error amplifying circuit of control circuit produce control voltage controlling switch pipe ON time decline, make output
Voltage drops to design load；When output voltage is less than design voltage, voltage feedback signal reduces, through the error of control circuit
The control voltage controlling switch pipe ON time producing after amplifying circuit increases, and makes output voltage bring up to design load.It is achieved in
Constant voltage exports.
Inductive current zero passage feedback circuit need to be in the inductive current zero passage detection input of the assists winding ns2 end of t1 and control circuit
Between connect a resistance, this resistance plays metering function, and when switching tube turns off, t1 primary side winding electric current reduces, and inductance is electric
Flowing through zero detection input voltage is high level, and when the electric current flowing through in t1 primary side winding is reduced to 0, induced voltage thereon is
0.Therefore, when this input detect voltage from high level to low level saltus step when, represent inductive current zero passage, now make out
Close pipe open-minded.
Fig. 6 gives the waveform diagram of iin and vin being applied to buck converter embodiment as shown in Figure 3, Figure 4, can
To find out iin close to sine wave, and with input voltage same-phase, reached improve power factor purpose.
Fig. 7 gives the waveform diagram of iin and vin being applied to flyback converter embodiment as shown in Figure 5, permissible
Find out iin close to sine wave, and with input voltage same-phase, reached improve power factor purpose.
Fig. 8 gives the waveform of control circuit key point, when switching tube is opened, inductive current linear rise, when closed between
During the time reaching control voltage control, switching tube turns off, inductive current linear decline.When inductive current zero passage, zcd signal
Low level is transformed into by high level, now power switch pipe is open-minded, so goes round and begins again.When system be operated in critical conduction mode
And ON time is constant, to improve power factor.
Claims (7)
1. a kind of High Power Factor constant voltage output switch power source, its composition includes: current rectifying and wave filtering circuit (1), power inverter (2),
Control circuit (3), output voltage feedback circuit (4), inductive current zero passage feedback circuit (5), chip power supply circuit (6), its
It is characterised by: after alternating current input, direct current is converted alternating current to by a current rectifying and wave filtering circuit (1), direct current is then defeated
Enter in power inverter (2), export load circuit from power inverter (2), then pass through output voltage feedback circuit
(4), inductive current zero passage feedback circuit (5), chip power supply circuit (6) these three circuit detect to main power circuit, obtain
To result be input in control circuit (3) and be allowed to work and draw control program, then the output transmission by control circuit (3)
Control it to power inverter (2).
2. Switching Power Supply according to claim 1 it is characterised in that: control circuit (3) includes seven input/output terminals, respectively
It is vcc, gnd, cs, fb, zcd, comp and out, wherein vcc is the power end of power supply circuits, gnd is power supply circuits
Earth terminal, cs is power switch pipe current sample input, and for overcurrent protection, fb is feedback voltage signal input, zcd
For inductive current zero passage detection input, comp is ON time control voltage output end, and out is driving signal of power switching tube
Output end.
3. Switching Power Supply according to claim 1 it is characterised in that: power inverter (2) using buck circuit topology or changes
Enter buck circuit topology or the flyback circuit topological structure of type.
4. Switching Power Supply according to claim 3 it is characterised in that: a kind of buck circuit topology knot of power inverter (2)
Structure, exchange input is converted into direct current by a uncontrollable rectifier bridge bd1 and filter capacitor cin, is connected to one afterwards
In the typical buck circuit being made up of mosfet switching tube q1, inductance l1, diode d1 and output capacitance cout, to above
The direct current of input carries out the step-down conversion of DC-to-DC and realizes power factor emendation function；Simultaneously in order to be connected with controlling
Connect, resistance r3, r4, r5, r6, diode d3 and electric capacity c3 constitute output voltage feedback circuit, wherein r4 plays current limliting and makees
With, d3 and c3 constitutes the control circuit of a voltage output, and on c3 when stablizing, voltage swing is equal in magnitude with output voltage,
And then can thus produce change feedback output when unstable in the chip of control circuit, output voltage values are then directly transmitted by r3
The input as switch controlling signal in control circuit, then carrys out opening of controlling switch pipe q1 by control circuit output control signal
Logical with turning off, output voltage stabilization is made with this, and the power supply circuits of control circuit chips are by r1, and c1, r2 and d2 are constituted,
Wherein r1 provides voltage and current in the circuit start stage to chip for starting resistance, and r2, d2 are when power switch pipe turns off
To chip power supply, maintain chip operating voltage electric current, c1 is filter capacitor, plays the effect of stable chip power supply voltage；rcs
It is then the less resistance of resistance, sampled for inductive current is converted into magnitude of voltage.
5. Switching Power Supply according to claim 3 it is characterised in that: a kind of follow-on buck electricity of power inverter (2)
Road topology, exchange input is converted into direct current by a uncontrollable rectifier bridge bd1 and filter capacitor cin, is connected to afterwards
One typical buck being made up of inductance l1, diode d1 in mosfet switching tube q1, transformer t1 and output capacitance cout
In circuit, the direct current above inputting is carried out with the step-down conversion of DC-to-DC and realizes power factor emendation function；Simultaneously
In order to be connected with control, it is anti-that resistance r3, r4, r5, r6, diode d3, electric capacity c3 and transformer t1 constitute output voltage
Converted for the output voltage values effect being used as sampled voltage, playing isolation, r4 are played metering function by current feed circuit, wherein t1,
D3 and c3 constitutes the control circuit of a voltage output, and on c3 when stablizing, voltage swing is equal in magnitude with output voltage, and not
Change feedback output then can be thus produced in the chip of control circuit, output voltage values then are transmitted directly to control by r3 when stablizing
As the input of switch controlling signal in circuit processed, then by control circuit output control signal come controlling switch pipe q1 open with
Turn off to make output voltage stabilization with this,；And the power supply circuits of control circuit chips are by r1, c1, r2 and d2 are constituted, wherein
R1 provides voltage and current in the circuit start stage to chip for starting resistance, and r2, d2 are when power switch pipe turns off to chip
Power supply, maintains chip operating voltage electric current, and c1 is filter capacitor, plays the effect of stable chip power supply voltage；Rcs is then one
The less resistance of individual resistance, is sampled for inductive current is converted into magnitude of voltage.
6. Switching Power Supply according to claim 3 it is characterised in that: the flyback circuit topology of power inverter (2), will
Exchange input is converted into direct current by a uncontrollable rectifier bridge bd1 and filter capacitor cin, is connected to one afterwards by mosfet
In the flyback circuit of switching tube q1, transformer t1, diode d1 and output capacitance cout composition, straight to above input
Stream electricity carries out the step-down conversion of DC-to-DC and realizes power factor emendation function；Simultaneously in order to be connected with control, resistance
R3, r4, r5, r6, diode d3, electric capacity c3 and transformer t1 constitute output voltage feedback circuit, and wherein t1 will export
Magnitude of voltage is converted to be used as sampled voltage, can play the effect of isolation, and r4 plays metering function, and d3 and c3 constitutes an electricity
The control circuit of pressure output, on c3 when stablizing, voltage swing is equal in magnitude with output voltage, and then can thus produce change when unstable
Change feedback output in the chip of control circuit, r3 then output voltage values is transmitted directly in control circuit as switch control rule
The input of signal, then by control circuit output control signal come controlling switch pipe q1 open and turn off to make output voltage with this
It is stable,；And the power supply circuits of control circuit chips are by r1, c1, r2 and d2 are constituted, and wherein r1 is to start resistance in circuit
Startup stage provides voltage and current to chip, and r2, d2 maintain chip operation when power switch pipe turns off to chip power supply
Voltage x current, c1 is filter capacitor, plays the effect of stable chip power supply voltage；Rcs is then the less resistance of resistance,
Sampled for inductive current is converted into magnitude of voltage.
7. according to claim 1-3 any claim Switching Power Supply control method it is characterised in that:
1) output voltage feedback signal is input to error signal amplification circuit, produces error with control circuit internal voltage reference after comparing
Signal, to control constant on-time with this, to meet the requirement of constant voltage output and High Power Factor；
2) switching tube is controlled to turn off, when inductor current value quilt when power switch tube current exceedes certain value or ON time reaches required value
Detect and during zero crossing, control switching tube conducting, make system be operated in critical conduction mode；
3) error amplifying circuit reference voltage and inductive current zero passage detection benchmark electricity are produced through reference voltage generating circuit by input voltage
Pressure etc.；
4) shutoff of switching tube and the control of turn-on instant drive external power switch pipe to open and close by power switch driver circuit
Disconnected.
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| CN107171553A (en) * | 2017-07-02 | 2017-09-15 | 中国航空工业集团公司雷华电子技术研究所 | A kind of BUCK converter circuits |
| CN107911897A (en) * | 2017-10-12 | 2018-04-13 | 宁波宜胜照明有限公司 | A kind of high-power full voltage input driving circuit and method suitable for LED |
| CN108365738A (en) * | 2018-03-14 | 2018-08-03 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit, control circuit and switching power circuit |
| CN110018413A (en) * | 2019-01-12 | 2019-07-16 | 广东省民防协会 | A kind of multifunctional electric ability meter |
| CN111446853A (en) * | 2020-05-26 | 2020-07-24 | 杭州必易微电子有限公司 | Constant voltage circuit, constant voltage control circuit and constant voltage control method |
| CN111669870A (en) * | 2020-04-29 | 2020-09-15 | 杭州涂鸦信息技术有限公司 | Constant current control chip and constant current control device |
| CN114123759A (en) * | 2021-11-30 | 2022-03-01 | 上海南芯半导体科技股份有限公司 | Alternating current-direct current converter and control method thereof |
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| CN116454079A (en) * | 2023-03-27 | 2023-07-18 | 天航长鹰(江苏)科技有限公司 | High-performance load point power supply |
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| CN107171553A (en) * | 2017-07-02 | 2017-09-15 | 中国航空工业集团公司雷华电子技术研究所 | A kind of BUCK converter circuits |
| CN107911897B (en) * | 2017-10-12 | 2023-11-24 | 宁波宜胜照明有限公司 | High-power full-voltage input driving circuit and method suitable for LED |
| CN107911897A (en) * | 2017-10-12 | 2018-04-13 | 宁波宜胜照明有限公司 | A kind of high-power full voltage input driving circuit and method suitable for LED |
| CN108365738A (en) * | 2018-03-14 | 2018-08-03 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit, control circuit and switching power circuit |
| CN108365738B (en) * | 2018-03-14 | 2024-03-22 | 杰华特微电子股份有限公司 | Control method and control circuit of switching circuit and switching power supply circuit |
| CN110018413A (en) * | 2019-01-12 | 2019-07-16 | 广东省民防协会 | A kind of multifunctional electric ability meter |
| CN110018413B (en) * | 2019-01-12 | 2024-06-11 | 广东人防工程质量检测有限公司 | Multifunctional electrical performance tester |
| CN111669870A (en) * | 2020-04-29 | 2020-09-15 | 杭州涂鸦信息技术有限公司 | Constant current control chip and constant current control device |
| CN111446853A (en) * | 2020-05-26 | 2020-07-24 | 杭州必易微电子有限公司 | Constant voltage circuit, constant voltage control circuit and constant voltage control method |
| CN114123759A (en) * | 2021-11-30 | 2022-03-01 | 上海南芯半导体科技股份有限公司 | Alternating current-direct current converter and control method thereof |
| CN114123759B (en) * | 2021-11-30 | 2024-01-26 | 上海南芯半导体科技股份有限公司 | AC-DC converter and control method thereof |
| TWI802319B (en) * | 2022-03-14 | 2023-05-11 | 晶豪科技股份有限公司 | Constant on time converter control circuit and constant on time converter |
| CN116454079A (en) * | 2023-03-27 | 2023-07-18 | 天航长鹰(江苏)科技有限公司 | High-performance load point power supply |
| CN116454079B (en) * | 2023-03-27 | 2023-12-26 | 天航长鹰(江苏)科技有限公司 | High-performance load point power supply |
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