CN104779783B - A kind of power supply circuit and Switching Power Supply - Google Patents
A kind of power supply circuit and Switching Power Supply Download PDFInfo
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- CN104779783B CN104779783B CN201510127220.5A CN201510127220A CN104779783B CN 104779783 B CN104779783 B CN 104779783B CN 201510127220 A CN201510127220 A CN 201510127220A CN 104779783 B CN104779783 B CN 104779783B
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- 239000003990 capacitor Substances 0.000 claims abstract description 72
- 230000005611 electricity Effects 0.000 claims description 13
- 230000015556 catabolic process Effects 0.000 claims description 7
- 230000005669 field effect Effects 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 6
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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Classifications
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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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
This application discloses a kind of power supply circuits and Switching Power Supply in powered-down source.The power supply circuit includes charging circuit and partially installing capacitor, when being input to the DC voltage input end of the power stage circuit of Switching Power Supply in input voltage, the charging circuit charges to the partially installing capacitor, to provide startup voltage for the control circuit for the Switching Power Supply, after control circuit startup, the charging circuit continues as the partially installing capacitor charging, to provide supply voltage for the control circuit.Therefore in the Switching Power Supply of the application power supply circuit, without additionally increasing start-up circuit to provide startup voltage to control circuit, there is lower manufacturing cost and higher integrated level.
Description
Technical field
This application involves system power supply technical fields, more specifically to a kind of power supply circuit and application power supply electricity
The Switching Power Supply on road.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that control switching tube turns on and off maintains defeated
Go out a kind of power supply of voltage stabilization, currently, the circuit structure of more commonly used Switching Power Supply is in addition to including power stage circuit and control
Generally further include a generating circuit of service voltage that circuit is powered in order to control outside circuit processed.
Fig. 1 is the structure chart of Switching Power Supply in the prior art.
Referring to such as Fig. 1, the main circuit of the Switching Power Supply in Fig. 1 uses the isolated form topological structure of inverse-excitation type, in the switch
Power supply includes power supply generation circuit 101 and power stage circuit 102 and control circuit 103, the generating circuit of service voltage 101
Including：Auxiliary winding L3, partially installing capacitor and start-up resistor Rst and diode D, the auxiliary winding L3 are coupled with transformer M,
For the electric energy in received power level circuit 102, charge to partially installing capacitor.It starts to work the moment in the control circuit,
The DC input voitage of the Switching Power Supply charges to the partially installing capacitor by the start-up resistor, described in obtaining
The startup voltage of control circuit so that the control circuit enters operating mode, and hereafter, the auxiliary winding receives the power
Electric energy in grade circuit charges to partially installing capacitor, to provide supply voltage for the normal work of the control circuit.
It is connected directly start-up resistor since above-mentioned power supply circuit needs are used with the input voltage of Switching Power Supply and provides
The startup voltage of control circuit and the starting current for generating a startup control circuit, and the start-up resistor Rst for receiving high pressure is general
It cannot be integrated within Switching Power Supply control chip, and be arranged in external circuit, thus be unfavorable for the integrated of Switching Power Supply,
Cause the problem that the volume of the Switching Power Supply is big, of high cost.
Invention content
In view of this, the application provides a kind of power supply circuit, to solve to need using power supply circuit described in the prior art
Use start-up resistor come starting current is provided and caused by the Switching Power Supply volume is excessive, the higher problem of cost.
To achieve the goals above, it is proposed that scheme it is as follows：
A kind of power supply circuit of Switching Power Supply, the Switching Power Supply include power stage circuit and control circuit, the control
Circuit output switch control signal, to control the on off state of main switch in the power stage circuit, which is characterized in that described
Power supply circuit includes partially installing capacitor and charging circuit, starts voltage and supply voltage to be provided to the control circuit,
When input voltage is input to the DC voltage input end of the power stage circuit, described in the charging circuit reception
Input voltage or the energy for being input to the power stage circuit charge to the partially installing capacitor, to be provided for the control circuit
Start voltage,
After the control circuit starts, the charging circuit continues to the input voltage or is input to the power
The energy of grade circuit, charges to the partially installing capacitor, to provide supply voltage for the control circuit.
Preferably, the charging circuit receives the energy on inductance in the power stage circuit, is filled to the partially installing capacitor
Electricity starts voltage and supply voltage to be provided for the control circuit.
Preferably, the charging circuit includes the first transistor and the first diode,
Wherein, the drain electrode end of the first transistor receives the energy on inductance in the power stage circuit, source terminal with
The anode of first diode is connected, and control terminal is grounded by the partially installing capacitor；
The cathode of first diode is grounded by the partially installing capacitor；
The first transistor is that gate source voltage is equal to the power tube that can be connected when zero.
Preferably, the drain electrode end of the first transistor is connected to the inductance of the power stage circuit and being connected for continued flow tube
Place, source terminal are grounded by the main switch.
Preferably, first diode cathode is connected by first resistor with the partially installing capacitor.
Preferably, the first transistor is N-type depletion MOS field-effect transistor.
Preferably, the power supply circuit further includes：The zener diode being connected in parallel with the partially installing capacitor.
Preferably, the breakdown voltage of the zener diode is the maximum supply power voltage that the control circuit can bear.
A kind of Switching Power Supply, which is characterized in that including the power supply circuit described in above-mentioned any one, with the power supply circuit
Connected control circuit, the power stage circuit being connected with the control circuit, wherein the power supply circuit is the control circuit
It provides and starts voltage and supply voltage.
Preferably, the power stage circuit is booster type circuit or step-down circuit.
It can be seen from the above technical scheme that power supply circuit disclosed in the present application is applied in Switching Power Supply, there is knot
Structure is simple, and without characteristics such as start-up resistors, is conducive to the integrated of the switching power circuit control chip, to reduce
The production cost of the Switching Power Supply.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure chart of Switching Power Supply in the prior art；
Fig. 2 is a kind of structure chart of power supply circuit disclosed in the embodiment of the present application；
Fig. 3 is the structure chart of power supply circuit disclosed in another embodiment of the application；
Fig. 4 is the structure chart of power supply circuit disclosed in the another embodiment of the application；
Fig. 5 is a kind of circuit structure diagram of Switching Power Supply disclosed in the embodiment of the present application；
Fig. 6 is the circuit structure diagram of Switching Power Supply disclosed in another embodiment of the application.
Specific implementation mode
It is directed in the power supply circuit of Switching Power Supply in the prior art, needs to use the startup being connected directly with input voltage
Resistance, and the start-up resistor for receiving high voltage can only be externally arranged in circuit, to cause the volume of the Switching Power Supply it is big,
Problem of high cost, this application provides a kind of power supply circuits of new Switching Power Supply.
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall in the protection scope of this application.
Fig. 2 is the structure chart of power supply circuit disclosed in the present embodiment.
It should be noted that user can according to demand set the application places of the power supply circuit, in this Shen
Please in, the power supply circuit can be applied in Switching Power Supply.
The power supply circuit is made of charging circuit and partially installing capacitor, and charging circuit receives the input that an input power provides
Voltage charges to partially installing capacitor, to form the startup voltage and supply voltage of the control circuit of Switching Power Supply on partially installing capacitor.
Referring to Fig. 2, in the present embodiment, the charging circuit of the power supply circuit includes：The first transistor T1, the first diode D1, institute
It is partially installing capacitor C to state partially installing capacitor, and a kind of specific connection relation of the power supply circuit is as follows：
The drain electrode of the first transistor T1 is connected directly with the ends DC voltage input end VIN for receiving input voltage VIN
Or coupling, such as when the power supply circuit is in Switching Power Supply, the drain electrode of the first transistor T1 can be by Switching Power Supply
Inductance in power stage circuit is connected with the input power.The first transistor T1 grids respectively with first diode
The cathode of D1, one end of partially installing capacitor C are connected, and connected common end, as first node, the first node is as power supply
The output end of circuit, for exporting supply voltage to the feeder ear of supply object (such as control circuit of switching voltage)；
The first diode anode D1 is connected with the source electrode of the first transistor T1, cathode is connect by partially installing capacitor C
Ground；
The wherein described the first transistor T1 is the power tube with the characteristic that can be connected when gate source voltage is zero, that is, is said
It is bright when having input voltage or energy input to the charging circuit, the charging circuit receives the input voltage or energy to institute
Partially installing capacitor charging is stated, so that the voltage on the partially installing capacitor C reaches the startup voltage of supply object, is started in supply object
Afterwards, the charging circuit continues to the input voltage or energy and charges to the partially installing capacitor C, so that the partially installing capacitor
Voltage on C is maintained the required supply voltage of the supply object.
The operation principle of the power supply circuit disclosed in above-described embodiment is：
When DC voltage VIN is input to the DC voltage input end ends VIN, the gate source voltage of the first transistor at this time
Vgs=0, since the first transistor T1 is the power tube with the characteristic that can be connected when gate source voltage is zero, so
The first transistor is in the conduction state, i.e., charging circuit at this time is in the conduction state, therefore input voltage VIN can lead to
The charging circuit for crossing the first transistor and first diode composition charges to the partially installing capacitor, so that described
The output end of power supply circuit provides one to the supply object and starts voltage vcc, starts the supply object.In the power supply pair
After startup, since the first transistor T1 is the power tube with the characteristic that can be connected when gate source voltage is zero, because
This its it is in the conduction state always, to make the first transistor continue to input voltage, pass through the first diode pair institute
It states partially installing capacitor to charge, and then supply voltage is provided for the supply object, the supply object is made to keep normal work.
It can be seen that power supply circuit construction disclosed in the above embodiments of the present application is simple, it is applied in Switching Power Supply when by the circuit
When, since charging circuit successively charges to the partially installing capacitor, startup voltage is provided with the control circuit for the Switching Power Supply
And therefore supply voltage proposes partially installing capacitor charging come circuit in order to control using start-up circuit (such as start-up resistor) without additional
For starting voltage, be conducive to the integrated of the switching power circuit circuit board, and reduce the production of the Switching Power Supply
Cost.
It should be noted that when the power supply circuit is applied in Switching Power Supply, the supply object is institute
State the control circuit of Switching Power Supply.
It should be noted that it can also be to adopt that the power supply circuit can be directly connected when being connected with the power supply
It is connected with coupling form.
Fig. 3 is the structure chart of power supply circuit disclosed in another embodiment of the application.
The charging current of the partially installing capacitor C is excessive in order to prevent, and the supply object is caused to be burned out, referring to Fig. 3,
Above-mentioned power supply circuit can also include：First resistor RS, the first resistor RS are set to the first transistor T1 and described
It is excessive to the charging current I of the partially installing capacitor C to limit charging circuit between partially installing capacitor C, the reason is that, the charging
Electric current I=(Vth-VD)/R, Vth=Vcc-Vs, wherein the R is the resistance value of the first resistor RS, Vth is described first brilliant
The absolute value of the threshold voltage of body pipe, VD are the conduction voltage drop of the first diode D1, and Vs is the source electrode electricity of the first transistor
Pressure, therefore the size of charging current I can be controlled by the way that first resistor RS is arranged.
Fig. 4 is the structure chart of power supply circuit disclosed in the another embodiment of the application.
Since charging circuit constantly gives the partially installing capacitor C to charge, the partially installing capacitor C can be caused to the supply object
The voltage of offer is continuously improved, so occurring the overtension that the partially installing capacitor C is provided to the control object in order to prevent
And the problem of leading to supply object cisco unity malfunction, it is also added to one on the basis of the above embodiments referring to Fig. 4 the application
The cathode of a zener diode D2, the zener diode D2 are connected with the first node, plus earth, i.e., with the biasing
Capacitance C is connected in parallel.When the voltage that the partially installing capacitor C is provided to the feeder ear of the supply object is more than two pole of the voltage stabilizing
When the breakdown voltage of pipe D2, the zener diode D2 is breakdown, and the partially installing capacitor C is discharged by the zener diode 2,
The problem of to prevent the supply object to be too high to normal work because of power input input voltage.
The type of the zener diode D2 in certain above-described embodiment can be set according to user demand, only be needed
Ensure that the breakdown voltage of the zener diode is not more than the maximum supply power voltage of the supply object, such as can select
Take breakdown voltage zener diode identical with the maximum supply power voltage of the supply object.
It is understood that since the power tube by many types can all be connected when gate source voltage is zero, institute
With the application not to selecting what type of the first transistor to carry out considered critical, but applicant has found by numerous studies
When the first transistor is N-type depletion MOS field-effect transistor (depletion type NMOSFET), the confession
The power supply effect of circuit reaches best, so in the preferred technical solution of the application, the first transistor is depletion type
NMOS tube.
Corresponding to above-mentioned power supply circuit, present invention also provides the kind Switching Power Supplies of an application power supply circuit.
The Switching Power Supply includes above-mentioned any one power supply circuit, the control electricity being connected with the power supply circuit
Road, the power stage circuit being connected with the control circuit, the control circuit output switch control signal, to control the power
The on off state of main switch in grade circuit, wherein power supply pair of the control circuit of the Switching Power Supply as the power supply circuit
As the power supply circuit is provided to the control circuit starts voltage and supply voltage.
The power supply circuit includes charging circuit and partially installing capacitor, when input voltage is input to the straight of the power stage circuit
When flowing voltage input end, the charging circuit receives the input voltage or the energy for being input to the power stage circuit, opens
Begin to charge to partially installing capacitor, the voltage on partially installing capacitor is made slowly to increase, starts voltage to give the control circuit to provide, when inclined
When setting the voltage on capacitance and rising to the startup voltage that the control circuit needs, the control circuit starts to start, and works,
Since the need of work of control circuit extracts voltage from partially installing capacitor, after control circuit startup, the charging circuit
It continues to the input voltage or is input to the energy of the power stage circuit, charge to partially installing capacitor, to give the control
Circuit processed provides supply voltage, and shown control circuit is enable to keep working normally.The control circuit and the power stage circuit
It is connected, the break-make for controlling power stage circuit, to the reception for the keeping the power stage circuit intermittent input voltage, and
The input voltage is converted to a stabilization or adjustable output voltage to make load work normally.
When the power supply circuit is used for switch source, the charging circuit of the power supply circuit can directly with it is described straight
It flows voltage input end to be connected, be charged to the partially installing capacitor with receiving the input voltage, also can receive and be input to the power
Energy in grade circuit charges to the partially installing capacitor, such as in the present embodiment, the charging circuit can be described in reception
The energy on inductance in power stage circuit charges to the partially installing capacitor, starts voltage and confession to be provided for the control circuit
Piezoelectric voltage.Therefore, it is opened come the offer of circuit in order to control without the additional start-up circuit that increases using the Switching Power Supply of the power supply circuit
Dynamic voltage, has higher integrated level, and manufacturing cost is low.
Switching Power Supply provided by the invention can be different types of Switching Power Supply, such as step down switching regulator, boost type
Switching Power Supply and Buck-Boost Switching Power Supply etc., therefore, the power stage circuit can be booster type circuit or decompression
Type circuit, naturally it is also possible to be voltage boosting-reducing hybrid circuit, will come by taking voltage-dropping type and booster type as an example in the application further
The power supply circuit in switch source provided by the invention, and the switching voltage with the power supply circuit are described further.
Fig. 5 is a kind of Switching Power Supply using power supply circuit provided by the present application disclosed in the embodiment of the present application.
Referring to Fig. 5, the power stage circuit of the Switching Power Supply disclosed in the present embodiment is step-down circuit, i.e. the present embodiment
The Switching Power Supply is booster switcher power supply.The Switching Power Supply is used to be input to the input electricity of DC voltage input end
Pressure VIN is converted to a stabilization or adjustable output voltage to make load work normally.The Switching Power Supply may include：Power supply
Circuit 501, control circuit 103 and power stage circuit 502, wherein the power supply circuit 501 of the Switching Power Supply can be above-mentioned
It anticipates power supply circuit disclosed in an embodiment, only to facilitate understanding in attached drawing 5, has chosen one of embodiment as attached drawing
Power supply circuit 501 in 5.
The power stage circuit of the Switching Power Supply disclosed in the embodiment of the present application can be step-down circuit or booster type electricity
Road, or buck-boost hybrid circuit, in Switching Power Supply shown in Fig. 5, power stage circuit is with step-down circuit
Example, the power stage circuit 502 include：Main switch SR, the first output capacitance C0, the first inductance L and the second diode Do
(continued flow tube).
The cathode of the second diode Do is connected with the input power of the Switching Power Supply, anode and first inductance
One end of L is connected, and connecting place is second node；The other end of one end of the first output capacitance Co and the first inductance L
It is connected, connecting place ground connection, the other end of the first output capacitance Co is connected with the cathode of the second diode Do；The master
The first end of switching tube SR is grounded, and second end is connected with the second node, and by the second diode Do with it is described defeated
Enter power supply to be connected, the control terminal of the switching tube SR is connected with the pulse signal output end Drv of the control circuit 103；It is described
The feeder ear VCC of control circuit 103 is connected with the output end of the power supply circuit 501.The output switch control of the control circuit 103
Signal processed controls the storing discharging energy state of the first inductance L, to pass through to control the on off operating mode of the switching tube SR
The first inductance L and the first output capacitance C0Filter action, convert surely the input voltage of the input power to
Fixed output voltage powering load.
In the present embodiment, in order to make the high power born on the reduction main switch SR, and make the power supply electricity
The drain electrode of the first transistor T1 on road 501 is connected with the second node, i.e., the drain electrode of the described the first transistor T1 is connected to work(
The connecting place of inductance and continued flow tube in rate grade circuit 502 is exported by the second diode D0 or the first inductance L and first
Capacitance Co is connected with the ends the DC voltage input end VIN, then makes the second end of the main switch SR and the first crystal
The source electrode of pipe T1 is connected, and so that the main switch SR is passed through the first transistor T1 and is connected with the second node, you can makes
The energy of power stage 502 is input to after the first transistor T1 using the main switch SR.Such connection type, makes
In the Switching Power Supply, the first transistor T1 can be made to undertake power together with main switch SR, can only require the in this way
One transistor T1 can bear certain high power, and the requirement for the main switch SR is relatively low, can be resistance to
The more relatively low power tube of high-voltage performance, to save the manufacturing cost of the Switching Power Supply.
The course of work of Switching Power Supply as shown in the figure is：When Switching Power Supply powers on, input voltage VIN is input at this time
The ends DC voltage input end VIN of power stage circuit 502, at this time due to the first transistor T1 is a gate source voltage be zero when just
Power tube in the conduction state, such as N-type depletion MOS field-effect transistor, then the first transistor at this time
T1 is in the conduction state, then input voltage VIN gives the first inductance L storage energies by the first output capacitance Co, due at this point, control
The voltage at the ends feeder ear VCC of circuit 103 processed can't start control circuit 103, then control circuit 103 will not export master at this time
The switch control signal of switching tube SR, i.e. main switch SR are off state at this moment, thus at this time in power supply circuit 501
Charging circuit receives the energy on the first inductance L and charges to partially installing capacitor C, i.e. the first transistor T1 is received on the first inductance L
Energy (being input to the energy in power stage circuit) is charged by the first diode D1 and first resistor RS to partially installing capacitor C.
When the charging circuit charges to partially installing capacitor C so that the voltage on partially installing capacitor C reaches the startup voltage of control circuit 103
When, i.e., partially installing capacitor C provides startup voltage to control circuit 103 so that control circuit 103 starts to start work.Control electricity
After road 103 starts work, meeting output switch control signal controls main switch SR on or off, and the phase is connected in main switch SR
Between, the energy for being input to power stage circuit 502 flows to main switch SR by the first transistor T1, and control circuit 103 also can
From extracting energy on partially installing capacitor C, during main switch SR shutdowns, first crystal can be passed through by flowing to the energy of power stage circuit
The charging circuit that pipe T1, the first diode D1, first resistor RS are formed continues to charge to partially installing capacitor C, with for control circuit 103
Supply voltage is provided, even if voltage stabilization on partially installing capacitor 103 required supply voltage of circuit in order to control, to make control
Circuit 103 can maintain normal working condition.
In the present embodiment, the overtension on partially installing capacitor C in order to prevent, and control circuit 103 is burnt out, usually setting
When setting power supply circuit 501, a zener diode D2 being connected in parallel with partially installing capacitor C can be also set wherein, can usually be made
The breakdown voltage of the zener diode is the ceiling voltage that the control circuit 103 can bear.
It is that partially installing capacitor is charged as with charging circuit therefore in the power supply circuit of Switching Power Supply provided by the invention
Control circuit, which provides, starts voltage, after control circuit startup, so continues to be charged as controlling to partially installing capacitor using the charging circuit
Circuit processed provides supply voltage, realizes the multiplexing function of start-up circuit and power supply circuit.Therefore, the power supply circuit is being applied
Switching Power Supply in, add the start-up circuit such as start-up resistor again without additional startup voltage be provided, reduce manufacture
Cost improves integrated level.
Fig. 6 is the circuit structure diagram of Switching Power Supply disclosed in another embodiment of the application.
Referring to Fig. 6, the power stage circuit of the Switching Power Supply disclosed in the present embodiment is booster type circuit, i.e. this implementation
Switching Power Supply described in example is booster switcher power supply.The power stage circuit 502 of the Switching Power Supply provided by the present application may be used also
Think：Including main switch SR, the second inductance L2, third diode D3 and the second output capacitance C1, wherein the present embodiment discloses
The power stage circuit 502 concrete structure it is as follows：
One end of the second inductance L2 is connected with the input power of the Switching Power Supply, for receiving the input power
The input voltage VIN of output, the other end of the second inductance L2 are connected with the anode of the third diode D3, and connecting place is
Third node；The cathode of the third diode is connected with one end of the second output capacitance C1, second output capacitance
The other end of C1 is grounded；The first end of the switching tube SR is grounded, and second end is connected with the third node, i.e., the described switching tube
SR is connected by the second inductance L2 with the input power of the Switching Power Supply.The control terminal of the switching tube SR and the control
The pulse signal output end Drv of circuit 103 processed is connected；The feeder ear VCC of the control circuit 103 and the power supply circuit 501
Output end be connected.The control circuit 103 controls the break-make of the switching tube SR, that is, control the storage of the second inductance L2/
Exoergic state, to pass through the second inductance L2 and the second output capacitance C1Filter action, by the input power
Input voltage be converted into stable output voltage powering load.
In the present embodiment, in order to make the high power born on the reduction main switch SR, and make the power supply electricity
The drain electrode of the first transistor T1 on road 501 is connected with the third node, i.e., the drain electrode of the described the first transistor T1 is connected to work(
The connecting place of inductance and continued flow tube in rate grade circuit 502, passes through the secondth inductance L2 and the DC voltage input end VIN
End is connected, then the second end of the main switch SR is made to be connected with the source electrode of the first transistor T1, makes the main switch
SR is connected by the first transistor T1 with the third node, you can the energy for being input to power stage 502 is made to pass through first
Using the main switch SR after transistor T1.Such connection type so that in the Switching Power Supply, first can be made
Transistor T1 undertakes power together with main switch SR, can only require that the first transistor T1 can bear certain high power i.e. in this way
Can, and the requirement for the main switch SR is relatively low, can be the more relatively low power tube of high voltage performance, to save
The about manufacturing cost of the Switching Power Supply.
In the above embodiments, the switching tube SR can with but be not limited only to as MOS memory,
When the switching tube SR is N-type MOS memory, the first end is source electrode, and the second end is leakage
Pole, the control terminal are grid；When the switching tube SR is p-type MOS memory, the first end is
Drain electrode, the second end are source electrode, and the control terminal is grid.
In the design process of the power stage circuit, the switching tube SR can choose type and be：When the input of grid
The power tube that voltage is connected when being high level.
The course of work of Switching Power Supply disclosed in Fig. 6 with it is shown in fig. 5 essentially identical, when input voltage VIN is input to
When the DC voltage input end ends VIN, the gate source voltage Vgs=0 of the first transistor T1 at this time, due to the first transistor
T1 is the power tube with the characteristic that can be connected when gate source voltage is zero, so the first transistor T1 is on shape
State, therefore the energy for being input to power stage circuit 502 can pass through the first transistor T1 and first diode
D1 charges to the partially installing capacitor C, at this time power supply of the output end of the power supply circuit 501 to the control circuit 103
VCC is held to export a voltage, when the voltage, which reaches the control circuit 103, starts required minimum voltage (starting voltage),
I.e. partially installing capacitor C provides startup voltage to control circuit 103, and the control circuit 103 is made to start to start work, hereafter, institute
The output end for stating power supply circuit 501 continues the feeder ear VCC output voltages to the control circuit for the control circuit 103
The supply voltage of normal work, the control circuit is in normal work, in its pulse signal output end Drv to the switching tube
The control terminal output pulse signal of SR, it is electric in the power stage circuit 502 to control the switching tube SR break-makes, that is, to control
The storing discharging energy state of sense, to the filter action of inductance and output capacitance by the power stage circuit in 502, by institute
The input voltage for stating input power is converted into stable output voltage powering load.
It should be noted that in Fig. 5 or shown in fig. 6 Switching Power Supplies or applied to its of power supply circuit provided by the invention
In its Switching Power Supply, the charging circuit of power supply circuit can also directly receive input voltage and give partially installing capacitor charging, with for
Control circuit, which provides, starts voltage and supply voltage, in this case, charging circuit directly with the ends DC voltage input end VIN phase
Even, to receive input voltage VIN, and main switch can be selected as a high pressure resistant pipe, may be coupled directly to power stage electricity
The connecting place or main switch of inductance and continued flow tube select a switching tube of less demanding to pressure-resistant performance in road, can
The connecting place of inductance and continued flow tube in power stage circuit is connected to by an additional high pressure resistant pipe.
It can be seen that in Switching Power Supply disclosed in the application Fig. 5 and Fig. 6, is provided for the control circuit and start voltage and holding
The supply voltage needed when normal work can be obtained by the power supply circuit, be come without special one start-up circuit of offer
Startup voltage is provided for the control circuit, it is therefore not necessary to use start-up resistor, is conducive to the switching power circuit circuit board
It is integrated, and reduce the production cost of the Switching Power Supply.And it is described so that the switching tube in power stage circuit is passed through
The first transistor in power supply circuit is connected with the DC voltage input end, makes to undertake on the first transistor most
Voltage, and the high voltage undertaken required for alleviating on the switching tube, in the switching tube and the first transistor
It is that can bear the high-power tube of high voltage, and the switching tube can be selected as barotolerance to require nothing more than the first transistor
The lower power tube of energy, to further reduced the cost of manufacture of the Switching Power Supply.
It is understood that any equipment using Switching Power Supply provided by the present application the protection domain of the application it
Interior, the equipment can be computer, display screen, display, air-conditioning etc., also specially disclose this application a kind of this Shen of application
Please disclosed Switching Power Supply mobile phone.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Term " connection " or " connected " include direct or indirect connection or phase
Even, moreover, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that packet
The process, method, article or equipment for including a series of elements includes not only those elements, but also includes being not explicitly listed
Other element, or further include for elements inherent to such a process, method, article, or device.Do not limiting more
In the case of, the element that is limited by sentence "including a ...", it is not excluded that in the process including the element, method, object
There is also other identical elements in product or equipment.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the application.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or range.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (9)
1. a kind of power supply circuit of Switching Power Supply, the Switching Power Supply includes power stage circuit and control circuit, the control electricity
Road output switch control signal, to control the on off state of main switch in the power stage circuit, which is characterized in that the confession
Circuit includes partially installing capacitor, charging circuit and first resistor, starts voltage and power supply electricity to be provided to the control circuit
Pressure,
When input voltage is input to the DC voltage input end of power stage circuit, the charging circuit receives the input voltage
Or it is input to the energy of the power stage circuit, and it charges to the partially installing capacitor, to provide startup voltage for the control circuit,
After the control circuit starts, the charging circuit continues to the input voltage or is input to the power stage electricity
The energy on road charges to the partially installing capacitor, to provide supply voltage for the control circuit,
The charging circuit includes N-type depletion MOS field-effect transistor, the N-type depletion type metal oxidation
The gate terminal of object semiconductcor field effect transistor is connected with the first end of the partially installing capacitor, at the first end of the partially installing capacitor
Voltage is the supply voltage, and the second end of the partially installing capacitor is grounded；
The first resistor is set to the source electrode of N-type depletion MOS field-effect transistor and the biasing
Between capacitance, for limiting charging current of the charging circuit to the partially installing capacitor.
2. power supply circuit according to claim 1, which is characterized in that the charging circuit receives in the power stage circuit
Energy on inductance charges to the partially installing capacitor, starts voltage and supply voltage to be provided for the control circuit.
3. power supply circuit according to claim 2, which is characterized in that the charging circuit further includes the first diode,
The drain electrode end of N-type depletion MOS field-effect transistor receives in the power stage circuit on inductance
Energy, source terminal is connected with the anode of first diode；
The cathode of first diode is grounded by the partially installing capacitor.
4. power supply circuit according to claim 3, which is characterized in that the N-type depletion MOS
The drain electrode end of effect transistor is connected to the inductance of the power stage circuit and the connecting place of continued flow tube, and source terminal is opened by the master
Close pipe ground connection.
5. according to the power supply circuit in claim 4, which is characterized in that first diode cathode passes through first resistor and institute
Partially installing capacitor is stated to be connected.
6. according to the power supply circuit in claim 3, which is characterized in that further include：
The zener diode being connected in parallel with the partially installing capacitor.
7. according to the power supply circuit in claim 6, which is characterized in that the breakdown voltage of the zener diode is the control
The maximum supply power voltage that circuit can bear.
8. a kind of Switching Power Supply, which is characterized in that including the power supply circuit described in claim 1-7 any one, with the confession
The connected control circuit of circuit, the power stage circuit being connected with the control circuit, wherein the power supply circuit is the control
Circuit processed, which provides, starts voltage and supply voltage.
9. according to the Switching Power Supply in claim 8, which is characterized in that the power stage circuit is booster type circuit or decompression
Type circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510127220.5A CN104779783B (en) | 2014-04-30 | 2015-03-23 | A kind of power supply circuit and Switching Power Supply |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410183966.3A CN103929055A (en) | 2014-04-30 | 2014-04-30 | Power supply circuit and switching power supply |
| CN2014101839663 | 2014-04-30 | ||
| CN201510127220.5A CN104779783B (en) | 2014-04-30 | 2015-03-23 | A kind of power supply circuit and Switching Power Supply |
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| Publication Number | Publication Date |
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| CN104779783A CN104779783A (en) | 2015-07-15 |
| CN104779783B true CN104779783B (en) | 2018-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410183966.3A Pending CN103929055A (en) | 2014-04-30 | 2014-04-30 | Power supply circuit and switching power supply |
| CN201510127220.5A Active CN104779783B (en) | 2014-04-30 | 2015-03-23 | A kind of power supply circuit and Switching Power Supply |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410183966.3A Pending CN103929055A (en) | 2014-04-30 | 2014-04-30 | Power supply circuit and switching power supply |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836421B (en) | 2015-05-19 | 2017-12-05 | 矽力杰半导体技术(杭州)有限公司 | The power supply circuit and method of supplying power to of a kind of Switching Power Supply |
| CN108631565B (en) * | 2017-03-21 | 2020-04-28 | 赤多尼科两合股份有限公司 | Two-stage switch power supply |
| CN206850667U (en) * | 2017-04-21 | 2018-01-05 | 赤多尼科两合股份有限公司 | Start control circuit and Switching Power Supply |
| CN108880296B (en) * | 2018-06-12 | 2021-01-05 | 昂宝电子（上海）有限公司 | Power supply conversion system |
| CN110011279B (en) * | 2019-03-18 | 2021-05-28 | 苏州伟创电气科技股份有限公司 | Switching power supply protection circuit and switching power supply protection method |
| CN113541444B (en) * | 2020-04-15 | 2023-03-24 | 成都中启易联科技有限公司 | Current recovery circuit, switch converter and integrated circuit |
| CN115800756A (en) * | 2022-11-28 | 2023-03-14 | 万洲电气股份有限公司 | A three-phase smart meter power supply circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023298A (en) * | 2013-01-04 | 2013-04-03 | 无锡硅动力微电子股份有限公司 | Self-powered circuit applied to AC-DC (alternating current to digital current) switching mode power converter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000175449A (en) * | 1998-12-07 | 2000-06-23 | Nec Eng Ltd | Switching power source circuit |
| JP5849488B2 (en) * | 2011-07-20 | 2016-01-27 | サンケン電気株式会社 | Switching power supply |
| CN102355134B (en) * | 2011-09-23 | 2013-09-18 | 成都芯源系统有限公司 | Switch conversion circuit and conversion method |
-
2014
- 2014-04-30 CN CN201410183966.3A patent/CN103929055A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023298A (en) * | 2013-01-04 | 2013-04-03 | 无锡硅动力微电子股份有限公司 | Self-powered circuit applied to AC-DC (alternating current to digital current) switching mode power converter |
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| Publication number | Publication date |
|---|---|
| CN104779783A (en) | 2015-07-15 |
| CN103929055A (en) | 2014-07-16 |
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