CN206452314U - A kind of Switching Power Supply - Google Patents
A kind of Switching Power Supply Download PDFInfo
- Publication number
- CN206452314U CN206452314U CN201720107409.2U CN201720107409U CN206452314U CN 206452314 U CN206452314 U CN 206452314U CN 201720107409 U CN201720107409 U CN 201720107409U CN 206452314 U CN206452314 U CN 206452314U
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- transformer
- switching power
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The utility model embodiment discloses a kind of Switching Power Supply, and the Switching Power Supply includes filter circuit, rectification circuit and transformer, in addition to：PFC chip.The filter circuit is used to be filtered the ac signal of input, the electromagnetic interference in suppression circuit；The input of the rectification circuit is connected with the output end of the filter circuit, for being d. c. voltage signal by the ac signal rectification after filtering process；The PFC chip is connected with the input of the transformer, and the d. c. voltage signal for the input to the transformer carries out PFC and adjustment, to improve the power factor of power supply, while so that the transformer exports constant voltage.It by using above-mentioned Switching Power Supply, may be such that the power of power network is fully utilized, can also reach reduction power volume, cost-effective effect.
Description
Technical field
The utility model embodiment is related to power technique fields, more particularly to a kind of Switching Power Supply.
Background technology
As global energy is more and more nervous, energy-saving and emission-reduction have turned into the target that people pursue jointly.Improve Switching Power Supply
Utilization ratio be particularly important.
For the Switching Power Supply that power output is more than 75W, its power factor value of national requirements is more than 0.9, therefore, in order to
The power of national grid is set to be fully utilized, it is necessary to increase PFC (Power Factor Correction, PFC)
Circuit, i.e., the voltage signal after rectification is exported carries out copped wave so that voltage and current in phase position.Then by the voltage after copped wave
Signal is exported to transformer again after the filtering process of high-voltage electrolytic capacitor, then through the electricity in control Transformer Winding
Press signal so that transformer has stable output (said process may be summarized to be traditional Switching Power Supply topological structure).However,
Because power supply employs this topological structure, this increases the cost for causing power supply (such as：Need to be using the more expensive big electrolysis electricity of high pressure
Hold), while will also cause PCB (Printed Circuit Board, printed circuit board) area increase.Simultaneously as existing
Circuit of power factor correction in typically use external metal-oxide-semiconductor, and existing MOS is present that switching speed is slow, loss is big and temperature
The features such as rise, also the power output for causing Switching Power Supply is reduced.
And for the electronic product that power output is below 75W, country is to its power factor no requirement (NR), in the original of transformer
While being also required to electrochemical capacitor to be filtered processing to the voltage signal after rectification, filtered voltage signal is output to transformation
After device, transformer produces output voltage.However, the use of electrochemical capacitor can also reduce the power output of power supply in the prior art.
So, presence for these reasons, the factor of the power of existing Switching Power Supply is low so that grid power is not obtained
To making full use of, while the volume of existing Switching Power Supply is big, cost is high.
Utility model content
The utility model embodiment provides a kind of Switching Power Supply, low with the power factor for solving existing Switching Power Supply, together
The problem of volume of Shi Xianyou Switching Power Supplies is greatly and cost is high.
The utility model embodiment provides a kind of Switching Power Supply, including filter circuit, rectification circuit and transformer, described
Switching Power Supply also includes：PFC chip；Wherein,
The filter circuit is used to be filtered the ac signal of input, the electromagnetic interference in suppression circuit；
The input of the rectification circuit is connected with the output end of the filter circuit, for by the exchange after filtering process
Electric signal rectification is d. c. voltage signal；
The PFC chip is connected with the input of the transformer, for the input to the transformer
D. c. voltage signal carry out PFC and adjustment, to improve the power factor of power supply, while so that the transformer
Export constant voltage.
Further, the transformer includes armature winding, assists winding and secondary windings；Wherein,
The armature winding is connected with the output end of the rectification circuit, for providing input voltage signal；
The secondary windings is connected with load, for exporting supply voltage according to the input voltage signal, is supplied to load
Electricity；
The assists winding is set with the armature winding homonymy, for converting the supply voltage by transformer turns ratio
For auxiliary voltage signal.
Further, the Switching Power Supply also includes：
Start-up circuit, is connected with the rectification circuit, and voltage letter is started for according to the electric signal after rectification, producing
Number；
Sample circuit, is connected with the assists winding of the transformer, for being detected to the boost voltage signal, and
Sampled voltage signal output is produced to the PFC chip.
Further, the Switching Power Supply also includes：
Secondary commutation filter circuit, is connected with the secondary windings of the transformer, whole for being carried out to the supply voltage
Stream obtains direct current signal powering load.
Further, the Switching Power Supply also includes the first diode and the first electric capacity；Wherein,
The positive terminal of first diode is connected with the assists winding of the transformer, the negative pole of first diode
End is connected with the PFC chip, and the voltage signal for the assists winding to the transformer carries out rectification, defeated
Go out d. c. voltage signal to charge to first electric capacity；
First capacitance connection is between the negative pole end and ground wire of the first diode, for the PFC
Chip power supply.
Further, the PFC chip includes Voltage stabilizing module, the PWM generator being sequentially connected, Schmidt
Trigger, buffer and metal-oxide-semiconductor；Wherein,
The input of the Voltage stabilizing module is connected with the assists winding of the transformer, and output end is sent out with the PWM respectively
Raw device, the Schmidt trigger are connected with the buffer, for the PWM generator, the Schmidt trigger and
The buffer is powered；
The PWM generator is connected with the assists winding of the transformer, in the direct current to the primary winding
While voltage carries out PFC, pass through the sampled voltage signal output pulse signal according to the sample circuit to institute
State Schmidt trigger；
The Schmidt trigger, for being adjusted to the pulse signal that the PWM generator is exported, exports square wave
Signal is to the buffer；
The buffer, the turn-on and turn-off for controlling the metal-oxide-semiconductor according to the square-wave signal；
The metal-oxide-semiconductor is connected with the armature winding of the transformer, for controlling oscillating transformers, exports constant voltage.
Further, the metal-oxide-semiconductor is the metal-oxide-semiconductor of GaN material.
Further, the PFC chip also includes：First resistor, comparator and current limliting setup module；Its
In,
The first resistor is connected between the source class of the metal-oxide-semiconductor and ground wire, the first resistor and the metal-oxide-semiconductor
Tie point is connected to the in-phase end of the comparator, for inputting comparison voltage as comparison point；
The current limliting setup module is connected with the end of oppisite phase of the comparator, for input reference voltage；
The output end of the comparator is connected with the PWM generator, for according to the comparison voltage and the benchmark
Voltage output control voltage, to control the PWM generator to work.
Further, the rectification circuit is full-wave rectifying circuit.
Further, the start-up circuit includes the second resistance and 3rd resistor being sequentially connected in series；Wherein,
The output end and ground that are electrically connected to the rectification circuit after the second resistance and 3rd resistor series connection
Between line；
Tie point between the second resistance and 3rd resistor obtains starting voltage as point is started, and the startup point connects
The PFC chip is connected to, for driving the PFC chip operation according to the startup voltage.
Further, the sample circuit includes the 4th resistance and the 5th resistance being sequentially connected in series；Wherein,
Circuit in parallel after 4th resistance and the 5th resistant series the transformer assists winding two
End；
Tie point between 4th resistance and the 5th resistance is connected to the PFC core as sampled point
Piece, for obtaining sampled voltage signal from the sampled point.
Further, the secondary commutation filter circuit includes the second diode, the second electric capacity and the 3rd electric capacity；Wherein,
The positive terminal of second diode is connected with the secondary windings of the transformer, the negative pole of second diode
End is connected with the positive terminal of second electric capacity；
The negative pole termination secondary ground of second electric capacity；
3rd electric capacity is connected in parallel on the two ends of second electric capacity.
The utility model embodiment provide a kind of Switching Power Supply, the Switching Power Supply include filter circuit, rectification circuit and
Transformer, in addition to PFC chip.By filter circuit, the ac signal of input can be filtered, suppressed
Electromagnetic interference in circuit；It is connected by the input of rectification circuit with the output end of filter circuit, can be by after filtering process
Ac signal rectification is d. c. voltage signal；It is connected by PFC chip with the input of transformer, can be to becoming
The d. c. voltage signal of the input of depressor carries out PFC and adjustment, is improving the same of the power factor of power supply
When so that transformer exports constant voltage.The application of the power factor chip, may be such that the power of power network is fully utilized,
Reduction power volume, cost-effective effect can be reached.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart for Switching Power Supply that the utility model embodiment one is provided；
A kind of structural representation for Switching Power Supply that Fig. 2 is provided by the utility model embodiment two；
Fig. 3 is a kind of circuit diagram for preferred Switching Power Supply that the utility model embodiment two is provided；
Fig. 4 is a kind of circuit diagram for preferred Switching Power Supply that the utility model embodiment two is provided.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than limits of the present utility model.Further need exist for
It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.
Embodiment one
Fig. 1 is a kind of structured flowchart for Switching Power Supply that the utility model embodiment one is provided.The Switching Power Supply can be used in
In TV, adapter, liquid crystal display, projecting apparatus, medicine equipment or army's industrial equipment.As shown in figure 1, the Switching Power Supply
100 include filter circuit 110, rectification circuit 120, transformer 130 and PFC chip 140.Wherein,
Filter circuit 110 is used to be filtered the ac signal of input, the electromagnetic interference in suppression circuit.
It is exemplary, the filter circuit in the present embodiment be preferably EMI (Electromagnetic Interference,
Electromagnetic interference) filter circuit, for filtering out DM EMI and common mode disturbances in ac signal.
The input of rectification circuit 120 is connected with the output end of filter circuit 110, for by the alternating current after filtering process
Signal rectification is d. c. voltage signal.
It is preferred that, rectification circuit is full-wave rectifying circuit.
PFC chip 140 is connected with the input of transformer 130, for the input to transformer 130
D. c. voltage signal carries out PFC and adjustment, to improve the power factor of power supply, while so that transformer 130 is exported
Constant voltage.
It should be noted that the PFC chip that the utility model embodiment is provided can be by the electricity after rectification
Pressure signal is directly connected to transformer, then PFC is carried out by power factor chip, to improve electronic product
Power factor value.Completed because the process of PFC can be integrated into PFC chip internal, therefore, power
Filtering after factor correcting can also be performed in PFC chip simultaneously, i.e., by using the utility model
The Switching Power Supply provided, can save the high-voltage electrolytic capacitor of power supply primary side, improve electrical source power factor value.So, by inciting somebody to action
The implementation procedure of peripheral circuit is integrated into power factor chip internal, can not only complete the correction of power factor, improves power supply
To the utilization rate of power network, while the volume of Switching Power Supply can also be reduced, cost is reduced.Again, due to PFC core
Piece can also realize the adjustment to transformer output voltage, therefore, transformer can be caused defeated by PFC chip
Go out constant voltage.
Specifically, transformer 130 preferably includes armature winding, assists winding and secondary windings；Wherein, armature winding with
The output end of rectification circuit is connected, for providing input voltage signal；Secondary windings is connected with load, for according to input voltage
Signal output supply voltage, powering load；Assists winding is set with armature winding homonymy, for that will be powered by transformer turns ratio
Photovoltaic conversion is auxiliary voltage signal.Boost voltage signal can be used for being sampled or other aid in treatment functions.
Between the primary and secondary that Switching Power Supply is in due to transformer, therefore isolation primary high pressure and secondary can be played
The effect of low pressure.
A kind of Switching Power Supply is present embodiments provided, the Switching Power Supply includes filter circuit, rectification circuit, transformer and work(
Rate factor correcting chip.By filter circuit, the ac signal of input can be filtered, the electromagnetism in suppression circuit is done
Disturb；It is connected by the input of rectification circuit with the output end of filter circuit, can be by the ac signal rectification after filtering process
For d. c. voltage signal；It is connected by PFC chip with the input of transformer, can be to the input of transformer
D. c. voltage signal carries out PFC and adjustment, the power factor of power supply is being improved, to cause grid power abundant
While utilization, it also may be such that transformer exports constant voltage.The application of the power factor chip, can also reach reduction power source body
Long-pending, cost-effective effect.
Embodiment two
A kind of structural representation for Switching Power Supply that Fig. 2 is provided by the utility model embodiment two, the present embodiment is upper
State and further refinement has been carried out to PFC chip on the basis of embodiment, while also add start-up circuit, sampling
Circuit and secondary commutation filter circuit.As shown in Fig. 2 the Switching Power Supply 200 includes filter circuit 210, rectification circuit 220, opened
Dynamic circuit 230, transformer 240, sample circuit 250, PFC chip 260 and secondary commutation filter circuit 270.Fig. 3
A kind of circuit diagram of the preferred Switching Power Supply provided for the utility model embodiment two.With reference to Fig. 3, first below to work(
All parts and its annexation and operation principle are specifically described in rate factor correcting chip 260, then respectively to each
Circuit is specifically described：
1st, PFC chip is illustrated：
PFC chip 260 may include that Voltage stabilizing module 261, the PWM generator being sequentially connected 262, Schmidt touch
Send out device 263, buffer 264 and metal-oxide-semiconductor 265；Wherein,
The input of Voltage stabilizing module 261 is connected with the assists winding of transformer 240, output end respectively with PWM generator
262nd, Schmidt trigger 263 is connected with buffer 264, for PWM generator 262, Schmidt trigger 263 and buffer
264 power supplies.
Specifically, in the utility model embodiment, the output end 1 and 2 of Voltage stabilizing module 261 is given respectively by positive voltage is exported
PWM generator 262 and Schmidt trigger 263 are powered.Output end 3 exports negative voltage and powered to buffer 264.
PWM generator 262 is connected with the assists winding of transformer 240, in the DC voltage to the armature winding of transformer 240
While carrying out PFC, pass through the sampled voltage signal output pulse signal according to sample circuit 250 to Schmidt
Trigger 263.
Therefore, PFC is carried out to the voltage of primary winding by PWM generator 262 so that civil power
Voltage is powered with current in phase position, improves power factor, saves the actual electric energy of civil power.
Schmidt trigger 263, for being adjusted to the pulse signal that PWM generator 262 is exported, output square wave letter
Number arrive buffer 264.
It should be noted that due to the rectangular pulse that is obtained from PWM generator 262 through transmit it is latter as to occur waveform abnormal
Become.For example, when the electric capacity on transmission line is larger, the rising edge of waveform will substantially slow down；When transmission line is longer, and receiving terminal
During the impedance mismatch of impedance and transmission line, oscillatory occurences will be produced in the rising edge and trailing edge of waveform；Or when other arteries and veins
Rush signal by the distribution capacity or public power wire between wire be added to rectangular pulse signal when, will appear from signal additional
Noise.Presence for these reasons, the switch efficiency of metal-oxide-semiconductor is easily interfered so that the working condition of metal-oxide-semiconductor is unstable
It is fixed.Edge is changed slow cyclical signal by using Schmidt trigger and is transformed to the steeper rectangular pulse signal in edge,
More satisfactory rectangular pulse waveform is can obtain, effective control to metal-oxide-semiconductor is realized.
Buffer 264, the turn-on and turn-off for controlling metal-oxide-semiconductor 265 according to square-wave signal.
Specifically, because the output end 3 of Voltage stabilizing module 261 is that buffer 264 provides negative voltage, therefore, buffer
264 outputs are also negative voltage.
Metal-oxide-semiconductor 265, is connected with the armature winding of transformer, for controlling oscillating transformers, exports constant voltage.
It is preferred that, the metal-oxide-semiconductor in the utility model embodiment is gallium nitride (GaN) metal-oxide-semiconductor.Due to gallium nitride metal-oxide-semiconductor tool
The features such as having small volume, low low in energy consumption, temperature rise, conduction loss and small switching loss, therefore, work(is integrated into by gallium nitride metal-oxide-semiconductor
Rate factor correcting chip internal can improve the working frequency of Switching Power Supply, improve the antijamming capability of metal-oxide-semiconductor, and further subtract
The volume of small Switching Power Supply, reduces cost.
Specifically, because the driving voltage of gallium nitride metal-oxide-semiconductor is negative voltage, therefore, the negative voltage exported by buffer
Effectively metal-oxide-semiconductor can be driven.
Further, PFC chip 260 also includes：First resistor R1, comparator 266 and current limliting setup module
267；Wherein, first resistor R1 is connected between the source class of metal-oxide-semiconductor 265 and ground wire, by first resistor R1 and metal-oxide-semiconductor 265 company
Contact is connected to the in-phase end of comparator 266, for inputting comparison voltage as comparison point；Current limliting sets 267 modules with being compared
The end of oppisite phase of device 266 is connected, for input reference voltage；The output end of comparator 266 is connected with PWM generator 262, for root
According to the comparison voltage and the reference voltage output control voltage, to control PWM generator 262 to work.
In specific implementation process, current limliting setup module 267 will produce reference voltage and the sampled voltage of transformer enters
Row compares.And first resistor R1 is connected with metal-oxide-semiconductor 265, the electric current of metal-oxide-semiconductor can be obtained, change can be got by sample rate current
The voltage of depressor armature winding is compared as comparison voltage and with reference voltage.When comparison voltage is less than reference voltage, than
Compared with the output control signal of device 266, control PWM generator 262 works.When comparison voltage is more than reference voltage, comparator 266 is turned over
Control information is transferred out, control PWM generator is stopped.Therefore, can by first resistor, comparator and current limliting setup module
Effectively control PWM generator work.
Further, resistance R7 can be connected between current limliting setup module 267 and ground as overcurrent protection resistance, for making
Obtain current limliting setup module and produce certain reference voltage.
2nd, start-up circuit 230, sample circuit 250 and secondary commutation filter circuit 270 are specifically described separately below：
(1) start-up circuit 230, are connected with rectification circuit 220, for according to the electric signal after rectification, producing and starting electricity
Press signal；
Exemplary, as shown in figure 3, start-up circuit 230 includes second resistance R2 and 3rd resistor R3；Wherein, the second electricity
Being electrically connected between the output end of rectification circuit 220 and ground wire after resistance R2 and 3rd resistor R3 series connection；Second resistance R2 and
Tie point between 3rd resistor R3 obtains starting voltage as point is started, and will start point and is connected to PFC chip
260, for being worked according to startup voltage driving power factor correcting chip 260.
(2) sample circuit 250, are connected with the assists winding of transformer, for being detected to the boost voltage signal,
And sampled voltage signal output is produced to PFC chip 260.
Specifically, as shown in figure 3, sample circuit 250 includes the 4th resistance R4 and the 5th resistance R5 being sequentially connected in series；Its
In, the 4th resistance R4 and the 5th resistance R5 series connection after circuit in parallel transformer 240 assists winding two ends；4th resistance
Tie point between R4 and the 5th resistance R5 is connected to PFC chip 260 as sampled point, for being obtained from sampled point
Take sampled voltage signal.
Further, Switching Power Supply 200 also includes the first diode D1 and the first electric capacity C1；Wherein, the first diode D1
Positive terminal be connected with the assists winding of transformer 240, the first diode D1 negative pole end and the phase of PFC chip 260
Even, the voltage signal for the assists winding to transformer 240 carries out rectification, exports d. c. voltage signal and is filled to the first electric capacity C1
Electricity；First electric capacity C1 is connected between the first diode D1 negative pole end and ground wire, for being supplied to PFC chip 260
Electricity.
(3) secondary commutation filter circuit 270, is connected with the secondary windings of transformer 240, for what is exported to secondary windings
Supply voltage carries out rectification and obtains direct current signal powering load.
Specifically, secondary commutation filter circuit 270 includes, the second diode D2, the second electric capacity C2 and the 3rd electric capacity C3；Its
In, the second diode D2 positive terminal is connected with the secondary windings of transformer, the second diode C2 negative pole end and the second electric capacity
C2 positive terminal is connected；Second electric capacity C2 negative pole termination secondary ground；3rd electric capacity C3 is connected in parallel on the second electric capacity C2 two ends.
Further, due to eliminating high-voltage electrolytic capacitor in secondary commutation filter circuit, output ripple voltage will be larger.
Therefore, linear voltage stabilization module 271 can be increased and filters out ripple voltage.
Specifically, Fig. 4 is a kind of circuit diagram for preferred Switching Power Supply that the utility model embodiment two is provided, ginseng
Examine Fig. 4, above-described embodiment and on the basis of, with reference to start-up circuit, sample circuit and secondary commutation filter circuit pair
The operation principle of Switching Power Supply is specifically described：
After the high-voltage signal after rectifier circuit rectifies is by second resistance R2 and 3rd resistor R3, R2 and R3 detections
Electric on to Switching Power Supply, now PWM generator is started working.Meanwhile, the voltage after rectification passes through the pin of transformer the 1st, then from 3
With PFC chip (being the D pins of chip in the drain electrode of the actual metal-oxide-semiconductor with core Embedded, figure) phase after pin output
Even, while 4 pin of transformer are connected with the feeder ear of chip.
In PFC chip course of normal operation, PFC core is given by the assists winding of transformer
Piece is powered.Detailed process is：The voltage of transformer assists winding is charged by the first diode D1 to the first electric capacity C1, when C1's
Voltage is increased to after the cut-in voltage of PFC chip, and chip starts to drive whole switch power supply system to work.Simultaneously
The d. c. voltage signal of primary winding can also be carried out PFC by PFC chip, i.e., believe voltage
Number it is chopped into square-wave signal (being specially PWM generator work in chip) so that electric current and voltage in phase, and then improves power supply
Power factor so that grid power is maximally utilized within the maximum rate constraints.
Switching Power Supply is provided with sample circuit, and is connected with the assists winding of transformer.As shown in figure 4, the 4th resistance R4
It is connected with the 5th resistance R5 as sampling resistor with auxiliary group of winding of transformer, due to assists winding and secondary windings turn ratio pass
System, there is also proportionate relationship for the voltage of assists winding and the voltage of secondary windings.Therefore, can by obtaining the voltage of assists winding
Reflect the output voltage of secondary windings.So, using R4 and R5 tie point as sampled point, sampling can be got from sampled point
Voltage is to reflect the output voltage of secondary windings., can be by transformation by the way that the sampled point is connected with power factor chip circuit
The output voltage of device secondary windings feeds back to PFC chip in the form of sampled voltage, and then output voltage is carried out
Adjustment.For example, when the low voltage that transformer secondary output winding is exported, the sampled voltage obtained by R4 and R5 is also corresponding inclined
It is low.Now, by increasing the dutycycle for the pulse signal that PWM generator is exported, the time increase of metal-oxide-semiconductor conducting is may be such that, with
Increase the primary winding charging interval, and then cause the output voltage increase of transformer.Based on same as described above
Principle, when the output voltage of transformer is higher, by reducing the dutycycle of pulse signal, may be such that transformer output electricity
Pressure drop is low.Therefore, by sample circuit, it may be such that transformer has stable output voltage.
It should be noted that when metal-oxide-semiconductor is turned on, the armature winding storage energy of transformer, secondary passes through the second electric capacity
Discharged with the 3rd electric capacity and provide voltage to load；When metal-oxide-semiconductor is turned off, the armature winding of transformer releases energy, while secondary
Winding is by output voltage powering load.Therefore, by controlling the turn-on and turn-off of metal-oxide-semiconductor to may be such that oscillating transformers, export
Constant voltage.
It should be noted that the voltage that secondary commutation filter circuit can sense transformer secondary output winding is by the two or two
After pole pipe D2 rectifications, then the DC voltage of smooth steady is can obtain after electric capacity (C2 and C3) filtering process, be end product
Supplied using the electric energy for providing high-accuracy stable.
A kind of Switching Power Supply is present embodiments provided, the present embodiment is on the basis of above-described embodiment, by by metal-oxide-semiconductor collection
Into to power factor core inner, it can further reduce the volume of Switching Power Supply while power factor value is improved, reduce cost.
Start-up circuit, sample circuit and secondary pole current rectifying and wave filtering circuit and PFC chip and above-described embodiment are carried simultaneously
Rectification circuit, filter circuit and the transformer of confession are combined, the Voltage Feedback that transformer secondary output winding can be exported to power because
Number correcting chip, adjusts dutycycle to control the turn-on and turn-off time of internal metal-oxide-semiconductor by PFC chip, and then
The output voltage stabilization of transformer can be caused.Therefore, the switching power circuit that this implementation new embodiment is provided not only work
Working frequency is high, output power, while small volume and cost is low.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from protection domain of the present utility model.Therefore, although pass through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and scope of the present utility model is by appended
Right determine.
Claims (10)
1. a kind of Switching Power Supply, including filter circuit, rectification circuit and transformer, it is characterised in that the Switching Power Supply is also wrapped
Include：PFC chip；Wherein,
The filter circuit is used to be filtered the ac signal of input, the electromagnetic interference in suppression circuit；
The input of the rectification circuit is connected with the output end of the filter circuit, for by the exchange telecommunications after filtering process
Number rectification is d. c. voltage signal；
The PFC chip is connected with the input of the transformer, for the straight of the input to the transformer
Flow voltage signal and carry out PFC and adjustment, to improve the power factor of power supply, while so that the transformer is exported
Constant voltage.
2. Switching Power Supply according to claim 1, it is characterised in that the transformer includes armature winding, assists winding
And secondary windings；Wherein,
The armature winding is connected with the output end of the rectification circuit, for providing input voltage signal；
The secondary windings is connected with load, for exporting supply voltage, powering load according to the input voltage signal；
The assists winding and the armature winding homonymy are set, supplemented by by transformer turns ratio, the supply voltage is converted
Help voltage signal.
3. Switching Power Supply according to claim 2, it is characterised in that the Switching Power Supply also includes：
Start-up circuit, is connected with the rectification circuit, for according to the electric signal after rectification, producing and starting voltage signal；
Sample circuit, is connected with the assists winding of the transformer, for being detected to the boost voltage signal, and produces
Sampled voltage signal output is to the PFC chip.
4. Switching Power Supply according to claim 3, it is characterised in that the Switching Power Supply also includes：
Secondary commutation filter circuit, is connected with the secondary windings of the transformer, is obtained for carrying out rectification to the supply voltage
To direct current signal powering load.
5. Switching Power Supply according to claim 3, it is characterised in that the Switching Power Supply also includes the first diode and the
One electric capacity；Wherein,
The positive terminal of first diode is connected with the assists winding of the transformer, the negative pole end of first diode with
The PFC chip is connected, and the voltage signal for the assists winding to the transformer carries out rectification, and output is straight
Voltage signal is flowed to charge to first electric capacity；
First capacitance connection is between the negative pole end and ground wire of the first diode, for the PFC chip
Power supply.
6. Switching Power Supply according to claim 3, it is characterised in that the PFC chip includes voltage stabilizing mould
Block, the PWM generator being sequentially connected, Schmidt trigger, buffer and metal-oxide-semiconductor；Wherein,
The input of the Voltage stabilizing module is connected with the assists winding of the transformer, output end respectively with the PWM generator,
The Schmidt trigger is connected with the buffer, for the PWM generator, the Schmidt trigger and described slow
Device is rushed to power；
The PWM generator is connected with the assists winding of the transformer, in the DC voltage to the primary winding
While carrying out PFC, applied by the sampled voltage signal output pulse signal according to the sample circuit described in
Schmitt trigger；
The Schmidt trigger, for being adjusted to the pulse signal that the PWM generator is exported, exports square-wave signal
To the buffer；
The buffer, the turn-on and turn-off for controlling the metal-oxide-semiconductor according to the square-wave signal；
The metal-oxide-semiconductor is connected with the armature winding of the transformer, for controlling oscillating transformers, exports constant voltage.
7. Switching Power Supply according to claim 6, it is characterised in that the metal-oxide-semiconductor is the metal-oxide-semiconductor of GaN material.
8. Switching Power Supply according to claim 6, it is characterised in that：The PFC chip also includes：First
Resistance, comparator and current limliting setup module；Wherein,
The first resistor is connected between the source class of the metal-oxide-semiconductor and ground wire, the first resistor and the connection of the metal-oxide-semiconductor
Point is connected to the in-phase end of the comparator, for inputting comparison voltage as comparison point；
The current limliting setup module is connected with the end of oppisite phase of the comparator, for input reference voltage；
The output end of the comparator is connected with the PWM generator, for according to the comparison voltage and the reference voltage
Output control voltage, to control the PWM generator to work.
9. Switching Power Supply according to claim 3, it is characterised in that：The start-up circuit includes the second electricity being sequentially connected in series
Resistance and 3rd resistor；Wherein,
The second resistance and the 3rd resistor series connection after the output end and ground wire that are electrically connected to the rectification circuit it
Between；
Tie point between the second resistance and 3rd resistor is obtained starting voltage as point is started, and the startup point is connected to
The PFC chip, for driving the PFC chip operation according to the startup voltage.
10. Switching Power Supply according to claim 3, it is characterised in that：The sample circuit includes the 4th be sequentially connected in series
Resistance and the 5th resistance；Wherein,
The two ends of assists winding of the circuit in parallel in the transformer after 4th resistance and the 5th resistant series；
Tie point between 4th resistance and the 5th resistance is connected to the PFC chip as sampled point,
For obtaining sampled voltage signal from the sampled point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720107409.2U CN206452314U (en) | 2017-01-25 | 2017-01-25 | A kind of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720107409.2U CN206452314U (en) | 2017-01-25 | 2017-01-25 | A kind of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206452314U true CN206452314U (en) | 2017-08-29 |
Family
ID=59668041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720107409.2U Active CN206452314U (en) | 2017-01-25 | 2017-01-25 | A kind of Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206452314U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994784A (en) * | 2017-12-29 | 2018-05-04 | 重庆希诺达通信有限公司 | A kind of ultrathin high-power ACDC Switching Power Supplies |
| CN111987911A (en) * | 2020-06-08 | 2020-11-24 | 江苏理工学院 | DCDC converter based on gallium nitride |
-
2017
- 2017-01-25 CN CN201720107409.2U patent/CN206452314U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994784A (en) * | 2017-12-29 | 2018-05-04 | 重庆希诺达通信有限公司 | A kind of ultrathin high-power ACDC Switching Power Supplies |
| CN111987911A (en) * | 2020-06-08 | 2020-11-24 | 江苏理工学院 | DCDC converter based on gallium nitride |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101860237B (en) | High-power factor constant-current circuit and power source | |
| CN106533152B (en) | A kind of device and method improving Boost three-level converter PF | |
| CN102510222B (en) | High voltage switch power supply circuit having power factor correcting function | |
| CN109525132A (en) | A kind of interleaved PFC constant voltage drive circuit, driving power and television set | |
| CN103813595A (en) | Efficient power source capable of supplying electricity in constant voltage and constant current alternation mode | |
| CN202334313U (en) | High-voltage switch power supply circuit with power-factor correction function | |
| CN206452314U (en) | A kind of Switching Power Supply | |
| US20230208279A1 (en) | Active diode circuit and ac/dc power conversion circuit | |
| CN206422703U (en) | A kind of single-phase AC DC converters corrected based on high power factor | |
| CN204858973U (en) | Isolation feedback supply circuit of LLC resonant transformation ware | |
| CN201199672Y (en) | Flyback converting device with single-stage power factor calibrating circuit | |
| CN203301387U (en) | Large-power high-frequency and high-voltage power supply | |
| CN202906742U (en) | Fly-back power source with power factor correction function | |
| CN203801099U (en) | Power circuit and microwave oven | |
| CN209250492U (en) | A kind of switch power module | |
| CN204947628U (en) | There is the charger of multiple USB output port | |
| CN204967611U (en) | Compound high -efficient power factor correction circuit | |
| CN209516748U (en) | A kind of output modulation circuit of wireless power transmission systems receiving side | |
| CN106329939B (en) | A kind of switching power converters | |
| CN110336458A (en) | Harmonic wave control circuit, power supply with the circuit and air conditioner | |
| CN204835959U (en) | High -power power of liquid cooling | |
| CN202334310U (en) | High-power switch power supply main circuit with high power factor and low harmonic current | |
| CN204835962U (en) | Voltage doubler rectifier circuit | |
| CN109391163A (en) | A kind of LLC Switching Power Supply and display device | |
| CN204271919U (en) | A kind of power adapter of IFD purifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |