CN104779783A - Power supply circuit and switching power supply - Google Patents
Power supply circuit and switching power supply Download PDFInfo
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- CN104779783A CN104779783A CN201510127220.5A CN201510127220A CN104779783A CN 104779783 A CN104779783 A CN 104779783A CN 201510127220 A CN201510127220 A CN 201510127220A CN 104779783 A CN104779783 A CN 104779783A
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- power supply
- circuit
- voltage
- control circuit
- power
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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
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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
- 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
The application of the invention discloses a switching power supply and a power supply circuit thereof. The power supply circuit comprises a charging circuit and a biased capacitor, when an input voltage is input to a direct-current voltage input end of a power-level circuit of the switching power supply, the charging circuit charges the biased capacitor so as to provide a starting voltage for a control circuit of the switching power supply, and after the control circuit is started, the charging circuit continues to charge the biased capacitor so as to provide a power supply voltage for the control circuit. Therefore, in the switching power supply adopting the power supply circuit, no starting circuit is additionally increased to provide the starting voltage for the control circuit, and the relatively low manufacturing cost and relatively high integration level are achieved.
Description
Technical field
The application relates to system power supply technical field, more particularly, relates to a kind of power supply circuits and applies the Switching Power Supply of these power supply circuits.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, maintain a kind of power supply of output voltage stabilization, at present, the circuit structure of relatively more conventional Switching Power Supply, except comprising power stage circuit and control circuit, generally also comprises a generating circuit of service voltage of powering for control circuit.
Fig. 1 is the structure chart of Switching Power Supply of the prior art.
See such as Fig. 1, the main circuit of the Switching Power Supply in Fig. 1 adopts the isolated form topological structure of inverse-excitation type, comprise power supply in this Switching Power Supply and produce circuit 101 and power stage circuit 102 and control circuit 103, described generating circuit of service voltage 101 comprises: auxiliary winding L 3, partially installing capacitor and starting resistance Rst and diode D, described auxiliary winding L 3 is coupled with transformer M, for the electric energy in received power level circuit 102, partially installing capacitor is charged.Start working the moment at described control circuit, the DC input voitage of described Switching Power Supply is charged to described partially installing capacitor by described starting resistance, thus obtain the starting resistor of described control circuit, described control circuit is made to enter mode of operation, after this, the electric energy that described auxiliary winding receives in described power stage circuit charges to partially installing capacitor, thus provides supply power voltage for the normal work of described control circuit.
Because above-mentioned power supply circuits need to use the starting resistance that to be directly connected with the input voltage of Switching Power Supply to produce startup control circuit starting current to provide the starting resistor of control circuit, and the starting resistance Rst receiving high pressure generally can not be integrated within Switching Power Supply control chip, but be arranged in external circuit, thus be unfavorable for the integrated of Switching Power Supply, cause the problem that the volume of described Switching Power Supply is large, cost is high.
Summary of the invention
In view of this, the application provides a kind of power supply circuits, adopts power supply circuits described in prior art to need to use the problem that volume is excessive, cost is higher of the described Switching Power Supply that starting resistance causes to provide starting current to solve.
To achieve these goals, the existing scheme proposed is as follows:
A kind of power supply circuits of Switching Power Supply, described Switching Power Supply comprises power stage circuit and control circuit, described control circuit output switch control signal, to control the on off state of main switch in described power stage circuit, it is characterized in that, described power supply circuits comprise partially installing capacitor and charging circuit, in order to provide starting resistor and supply power voltage to described control circuit
When input voltage inputs to the DC voltage input end of described power stage circuit, described charging circuit receives described input voltage or inputs to the energy of described power stage circuit, charges to described partially installing capacitor, thinks that described control circuit provides starting resistor,
After described control circuit starts, described charging circuit continues the energy receiving described input voltage or input to described power stage circuit, charges, think that described control circuit provides supply power voltage to described partially installing capacitor.
Preferably, described charging circuit receives the energy in described power stage circuit on inductance, charges to described partially installing capacitor, thinks that described control circuit provides starting resistor and supply power voltage.
Preferably, described charging circuit comprises the first transistor and the first diode,
Wherein, the drain electrode end of described the first transistor receives the energy in described power stage circuit on inductance, and source terminal is connected with the anode of described first diode, and control end is by described partially installing capacitor ground connection;
The negative electrode of described first diode is by described partially installing capacitor ground connection;
Described the first transistor is that gate source voltage can the power tube of conducting when equalling zero.
Preferably, the drain electrode end of described the first transistor is connected to the inductance of described power stage circuit and the connecting place of continued flow tube, and source terminal is by described main switch ground connection.
Preferably, described first diode cathode is connected with described partially installing capacitor by the first resistance.
Preferably, described the first transistor is N-type depletion MOS field-effect transistor.
Preferably, described power supply circuits also comprise: the voltage stabilizing didoe be connected in parallel with described partially installing capacitor.
Preferably, the puncture voltage of described voltage stabilizing didoe is the maximum supply power voltage that described control circuit can bear.
A kind of Switching Power Supply, is characterized in that, comprise the power supply circuits described in above-mentioned any one, the control circuit be connected with described power supply circuits, the power stage circuit be connected with described control circuit, wherein, described power supply circuits provide starting resistor and supply power voltage for described control circuit.
Preferably, described power stage circuit is booster type circuit or step-down circuit.
As can be seen from above-mentioned technical scheme, power supply circuits disclosed in the present application are applied in Switching Power Supply, have structure simple, and without the need to characteristics such as starting resistances, be conducive to the integrated of described switching power circuit control chip, thus reduce the production cost of described Switching Power Supply.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart of Switching Power Supply of the prior art;
The structure chart of Fig. 2 a kind of power supply circuits disclosed in the embodiment of the present application;
The structure chart of Fig. 3 power supply circuits disclosed in another embodiment of the application;
The structure chart of Fig. 4 power supply circuits disclosed in the another embodiment of the application;
The circuit structure diagram of Fig. 5 a kind of Switching Power Supply disclosed in the embodiment of the present application;
The circuit structure diagram of Fig. 6 Switching Power Supply disclosed in another embodiment of the application.
Embodiment
Be directed in the power supply circuits of prior art breaker in middle power supply, need to use the starting resistance be directly connected with input voltage, and receive high-tension starting resistance and can only be arranged in external circuit, thus cause the problem that the volume of described Switching Power Supply is large, cost is high, this application provides a kind of power supply circuits of new Switching Power Supply.
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
The structure chart of Fig. 2 power supply circuits disclosed in the present embodiment.
It should be noted that, user can set the application places of described power supply circuits according to demand, and in this application, described power supply circuits can be applied in Switching Power Supply.
Described power supply circuits are made up of charging circuit and partially installing capacitor, and charging circuit receives the input voltage that an input power provides, to partially installing capacitor charging, to form starting resistor and the supply power voltage of the control circuit of Switching Power Supply on partially installing capacitor.See Fig. 2, in the present embodiment, the charging circuit of described power supply circuits comprises: the first transistor T1, the first diode D1, and described partially installing capacitor is partially installing capacitor C, and the concrete annexation of one of described power supply circuits is as follows:
The drain electrode of described the first transistor T1 is held with the DC voltage input end VIN receiving input voltage VIN and is directly connected or couples, such as when described power supply circuits are used in Switching Power Supply, the drain electrode of the first transistor T1 is connected with described input power by the inductance in power stage circuit in Switching Power Supply.Described the first transistor T1 grid is connected with the described negative electrode of the first diode D1, one end of partially installing capacitor C respectively, and the common port be connected is as first node, described first node, as the output of power supply circuits, exports supply power voltage for the feeder ear to power supply object (control circuit of such as switching voltage);
Described first diode anode D1 is connected with the source electrode of described the first transistor T1, negative electrode passes through partially installing capacitor C ground connection;
Wherein said the first transistor T1 is that have when gate source voltage is zero can the power tube of characteristic of conducting, namely illustrate when having input voltage or energy inputs to described charging circuit, described charging circuit receives this input voltage or energy charges to described partially installing capacitor, with the starting resistor making the voltage on described partially installing capacitor C reach power supply object, after power supply object starts, described charging circuit continues the described input voltage of reception or energy charges to described partially installing capacitor C, supply power voltage required for described power supply object is maintained to make the voltage on described partially installing capacitor C.
Disclosed in above-described embodiment, the operation principle of described power supply circuits is:
When direct voltage VIN inputs to DC voltage input end VIN end, the now gate source voltage Vgs=0 of described the first transistor, because described the first transistor T1 is that have when gate source voltage is zero can the power tube of characteristic of conducting, so described the first transistor is in conducting state, namely charging circuit is now in conducting state, therefore input voltage VIN can be charged to described partially installing capacitor by the charging circuit of described the first transistor and described first diode composition, a starting resistor Vcc is provided to described power supply object to make the output of described power supply circuits, start described power supply object.After described power supply object starts, because described the first transistor T1 is that have when gate source voltage is zero can the power tube of characteristic of conducting, therefore it is in conducting state always, thus make described the first transistor continue to receive input voltage, charged by partially installing capacitor described in the first diode pair, and then provide supply power voltage for described power supply object, make described power supply object keep normal work.
Disclosed in visible the above embodiments of the present application, power supply circuit construction is simple, when by this circuit application in Switching Power Supply time, because charging circuit successively charges to described partially installing capacitor, think that the control circuit of described Switching Power Supply provides starting resistor and supply power voltage, therefore, additionally need not use start-up circuit (as starting resistance) to partially installing capacitor charging for control circuit provides starting resistor, be conducive to the integrated of described switching power circuit circuit board, and reduce the production cost of described Switching Power Supply.
It should be noted that at this, when described power supply circuits are applied in Switching Power Supply, described power supply object is the control circuit of described Switching Power Supply.
It should be noted that at this, can be that to be directly connected also can be adopts the form that couples connected when described power supply circuits are connected with described power supply.
The structure chart of Fig. 3 power supply circuits disclosed in another embodiment of the application.
In order to prevent the charging current of described partially installing capacitor C excessive, and cause described power supply object to be burnt, see Fig. 3, above-mentioned power supply circuits can also comprise: the first resistance RS, described first resistance RS is arranged between described the first transistor T1 and described partially installing capacitor C, excessive to limit the charging current I of charging circuit to described partially installing capacitor C, reason is, described charging current I=(Vth-VD)/R, Vth=Vcc-Vs, wherein said R is the resistance of described first resistance RS, Vth is the absolute value of the threshold voltage of described the first transistor, VD is the conduction voltage drop of the first diode D1, Vs is the source voltage of described the first transistor, therefore the size of charging current I can be controlled by arranging the first resistance RS.
The structure chart of Fig. 4 power supply circuits disclosed in the another embodiment of the application.
Because charging circuit charges constantly to described partially installing capacitor C, described partially installing capacitor C can be caused to improve constantly the voltage that described power supply object provides, the problem of object cisco unity malfunction so cause to prevent overtension that described partially installing capacitor C provides to described control object powering, also on the basis of above-described embodiment, a voltage stabilizing didoe D2 is with the addition of see Fig. 4 the application, the negative electrode of described voltage stabilizing didoe D2 is connected with described first node, plus earth, is namely connected in parallel with described partially installing capacitor C.When described partially installing capacitor C exceedes the puncture voltage of described voltage stabilizing didoe D2 to the voltage that the feeder ear of described power supply object provides, described voltage stabilizing didoe D2 is breakdown, described partially installing capacitor C is discharged by described voltage stabilizing didoe 2, thus prevents the problem that described power supply object cannot normally work because power input input voltage is too high.
The type of the described voltage stabilizing didoe D2 in certain above-described embodiment can set according to user's request, only need to ensure that the puncture voltage of described voltage stabilizing didoe is not more than the maximum supply power voltage of described power supply object, such as, can choose the voltage stabilizing didoe that puncture voltage is identical with the maximum supply power voltage of described power supply object.
Be understandable that, because the power tube by many types all can conducting when gate source voltage is zero, so the application is to selecting the first transistor of which kind of type to carry out considered critical, but applicant finds when described the first transistor is N-type depletion MOS field-effect transistor (depletion type NMOSFET) through large quantity research, the power supply effect of described power supply circuits reaches best, so in the preferred technical scheme of the application, described the first transistor is depletion type NMOS tube.
Corresponding to above-mentioned power supply circuits, present invention also provides the kind Switching Power Supply of the described power supply circuits of an application.
Described Switching Power Supply comprises the power supply circuits described in above-mentioned any, the control circuit be connected with described power supply circuits, the power stage circuit be connected with described control circuit, described control circuit output switch control signal, to control the on off state of main switch in described power stage circuit, the control circuit of wherein said Switching Power Supply is as the power supply object of described power supply circuits, and described power supply circuits provide starting resistor and supply power voltage to described control circuit.
Described power supply circuits comprise charging circuit and partially installing capacitor, when input voltage inputs to the DC voltage input end of described power stage circuit, described charging circuit receives described input voltage or inputs to the energy of described power stage circuit, start to charge to partially installing capacitor, the voltage on partially installing capacitor is made slowly to increase, starting resistor is provided to give described control circuit, when the starting resistor that the voltage rise on partially installing capacitor needs to described control circuit, described control circuit starts to start, and work, because the need of work of control circuit extracts voltage from partially installing capacitor, therefore after control circuit starts, described charging circuit continues the energy receiving described input voltage or input to described power stage circuit, partially installing capacitor is charged, supply power voltage is provided to give described control circuit, make shown control circuit can keep normal work.Described control circuit is connected with described power stage circuit, for controlling the break-make of power stage circuit, thus make the described input voltage of the step reception of described power stage circuit, and described input voltage is changed into a stable or adjustable output voltage and normally work to make load.
Described power supply circuits be used for switch source in time, the charging circuit of described power supply circuits can directly be connected with described DC voltage input end, to receive described input voltage, described partially installing capacitor is charged, also can receive the energy inputed in described power stage circuit to charge to described partially installing capacitor, such as in the present embodiment, the energy that described charging circuit can receive on the inductance in described power stage circuit charges to described partially installing capacitor, thinks that described control circuit provides starting resistor and supply power voltage.Therefore, the Switching Power Supply applying described power supply circuits provides starting resistor without the need to additionally increasing start-up circuit for control circuit, has higher integrated level, and low cost of manufacture.
Switching Power Supply provided by the invention can be dissimilar Switching Power Supply, as step down switching regulator, booster switcher power supply and Buck-Boost Switching Power Supply etc., therefore, described power stage circuit can be booster type circuit or step-down circuit, can certainly be voltage boosting-reducing hybrid circuit, come for voltage-dropping type and booster type further to the power supply circuits in switch source provided by the invention in the application, and the switching voltage with these power supply circuits be described further.
The Switching Power Supply of Fig. 5 power supply circuits that a kind of the application of application provides disclosed in the embodiment of the present application.
See Fig. 5, disclosed in the present embodiment, the power stage circuit of described Switching Power Supply is step-down circuit, and the Switching Power Supply namely described in the present embodiment is booster switcher power supply.Described Switching Power Supply is used for the input voltage VIN inputing to DC voltage input end to change into a stable or adjustable output voltage and normally works to make load.Described Switching Power Supply can comprise: power supply circuits 501, control circuit 103 and power stage circuit 502, the power supply circuits 501 of wherein said Switching Power Supply can be power supply circuits disclosed in above-mentioned any embodiment, just for the ease of understanding in accompanying drawing 5, have chosen one of them embodiment as the power supply circuits 501 in accompanying drawing 5.
The power stage circuit of described Switching Power Supply disclosed in the embodiment of the present application can be step-down circuit or booster type circuit, also can be buck-boost hybrid circuit, in the Switching Power Supply shown in Fig. 5, power stage circuit is for step-down circuit, and described power stage circuit 502 comprises: main switch SR, the first output capacitance C
0, the first inductance L and the second diode Do (continued flow tube).
The negative electrode of described second diode Do is connected with the input power of described Switching Power Supply, and anode is connected with one end of described first inductance L, and connecting place is Section Point; One end of described first output capacitance Co is connected with the other end of described first inductance L, connecting place ground connection, and the other end of described first output capacitance Co is connected with the negative electrode of described second diode Do; The first end ground connection of described main switch SR, the second end is connected with described Section Point, and is connected with described input power by described second diode Do, and the control end of described switching tube SR is connected with the pulse signal output end Drv of described control circuit 103; The feeder ear VCC of described control circuit 103 is connected with the output of described power supply circuits 501.Described control circuit 103 output switch control signal, to control the on off operating mode of described switching tube SR, namely controls the storage/exoergic state of described first inductance L, thus by described first inductance L and described first output capacitance C
0filter action, the input voltage of described input power is converted into stable output voltage powering load.
In the present embodiment, in order to make the high power that the described main switch SR of reduction bears, and the drain electrode of the first transistor T1 of described power supply circuits 501 is connected with described Section Point, namely the drain electrode of described the first transistor T1 is connected to the connecting place of inductance and continued flow tube in power stage circuit 502, to be held with described DC voltage input end VIN by described second diode D0 or the first inductance L and the first output capacitance Co and be connected, second end of described main switch SR is made to be connected with the source electrode of described the first transistor T1 again, described main switch SR is connected with described Section Point by described the first transistor T1, the energy that can make to input to power stage 502 after the first transistor T1 again through described main switch SR.Such connected mode, make in described Switching Power Supply, the first transistor T1 can be made together with main switch SR to bear power, can only require that the first transistor T1 can bear certain high power like this, and it is lower for the requirement of described main switch SR, it can be the power tube that high voltage performance is lower, thus has saved the preparation cost of described Switching Power Supply.
The course of work of Switching Power Supply is as shown in the figure: when Switching Power Supply powers on, the DC voltage input end VIN that now input voltage VIN inputs to power stage circuit 502 holds, now owing to being just in the power tube of conducting state when the first transistor T1 be a gate source voltage is zero, as N-type depletion MOS field-effect transistor, then now the first transistor T1 is in conducting state, then input voltage VIN gives the first inductance L stored energy by the first output capacitance Co, due to now, the voltage that the feeder ear VCC of control circuit 103 holds can't start control circuit 103, then control circuit 103 now can not export the switch controlling signal of main switch SR, namely main switch SR is in off state at this moment, thus the energy that the charging circuit now in power supply circuits 501 receives in the first inductance L charges to partially installing capacitor C, namely the energy (inputing to the energy in power stage circuit) that the first transistor T1 receives in the first inductance L is charged to partially installing capacitor C by the first diode D1 and the first resistance RS.When described charging circuit charges to partially installing capacitor C, when making the voltage on partially installing capacitor C reach the starting resistor of control circuit 103, namely partially installing capacitor C provides starting resistor to control circuit 103, makes control circuit 103 start to start work.After control circuit 103 startup work, main switch SR conducting or shutoff can be controlled by output switch control signal, in main switch SR conduction period, the energy inputing to power stage circuit 502 flows to main switch SR by the first transistor T1, and control circuit 103 also can from extracting energy partially installing capacitor C, at main switch SR blocking interval, the energy flowing to power stage circuit can through the first transistor T1, first diode D1, the charging circuit that first resistance RS forms continues to charge to partially installing capacitor C, think that control circuit 103 provides supply power voltage, even if the supply power voltage of the voltage stabilization on partially installing capacitor required for control circuit 103, thus make control circuit 103 can maintain normal operating state.
In the present embodiment, in order to prevent the overtension on partially installing capacitor C, and burn out control circuit 103, usually when arranging power supply circuits 501, a voltage stabilizing didoe D2 be connected in parallel with partially installing capacitor C also can be set wherein, the puncture voltage of this voltage stabilizing didoe usually can be made to be the ceiling voltage that described control circuit 103 can bear.
Therefore, in the power supply circuits of Switching Power Supply provided by the invention, starting resistor is provided for partially installing capacitor is charged as control circuit with charging circuit, after control circuit starts, so utilize this charging circuit to continue to be charged as control circuit to partially installing capacitor and supply power voltage is provided, achieve the multiplexing function of start-up circuit and power supply circuits.Therefore, in the Switching Power Supply of the described power supply circuits of application, provide starting resistor without the need to start-up circuits such as the extra such as starting resistances of interpolation again, reduce manufacturing cost, improve integrated level.
The circuit structure diagram of Fig. 6 Switching Power Supply disclosed in another embodiment of the application.
See Fig. 6, the power stage circuit of described Switching Power Supply disclosed in the present embodiment is for being booster type circuit, and the Switching Power Supply namely described in the present embodiment is booster switcher power supply.The power stage circuit 502 of the described Switching Power Supply that the application provides can also be: comprise main switch SR, the second inductance L 2, the 3rd diode D3 and the second output capacitance C
1, wherein, disclosed in the present embodiment, the concrete structure of described power stage circuit 502 is as follows:
One end of described second inductance L 2 is connected with the input power of described Switching Power Supply, and for receiving the input voltage VIN that described input power exports, the other end of described second inductance L 2 is connected with the anode of described 3rd diode D3, and connecting place is the 3rd node; The negative electrode of described 3rd diode is connected with one end of described second output capacitance C1, the other end ground connection of described second output capacitance C1; The first end ground connection of described switching tube SR, the second end is connected with described 3rd node, and namely described switching tube SR is connected with the input power of described Switching Power Supply by described second inductance L 2.The control end of described switching tube SR is connected with the pulse signal output end Drv of described control circuit 103; The feeder ear VCC of described control circuit 103 is connected with the output of described power supply circuits 501.Described control circuit 103 controls the break-make of described switching tube SR, namely controls the storage/exoergic state of described second inductance L 2, thus by described second inductance L 2 and described second output capacitance C
1filter action, the input voltage of described input power is converted into stable output voltage powering load.
In the present embodiment, in order to make the high power that the described main switch SR of reduction bears, and the drain electrode of the first transistor T1 of described power supply circuits 501 is connected with described 3rd node, namely the drain electrode of described the first transistor T1 is connected to the connecting place of inductance and continued flow tube in power stage circuit 502, to be held with described DC voltage input end VIN by described secondth inductance L 2 and be connected, second end of described main switch SR is made to be connected with the source electrode of described the first transistor T1 again, described main switch SR is connected with described 3rd node by described the first transistor T1, the energy that can make to input to power stage 502 after the first transistor T1 again through described main switch SR.Such connected mode, make in described Switching Power Supply, the first transistor T1 can be made together with main switch SR to bear power, can only require that the first transistor T1 can bear certain high power like this, and it is lower for the requirement of described main switch SR, it can be the power tube that high voltage performance is lower, thus has saved the preparation cost of described Switching Power Supply.
In the various embodiments described above, described switching tube SR can but be not limited only to as MOS (metal-oxide-semiconductor) memory, when described switching tube SR is N-type MOS (metal-oxide-semiconductor) memory, described first end is source electrode, described second end is drain electrode, and described control end is grid; When described switching tube SR is P type MOS (metal-oxide-semiconductor) memory, described first end is drain electrode, and described second end is source electrode, and described control end is grid.
In the design process of described power stage circuit, described switching tube SR can choose type and be: the power tube of the conducting when the input voltage of grid is high level.
The course of work of Switching Power Supply disclosed in Fig. 6 and substantially identical shown in Fig. 5, when input voltage VIN inputs to DC voltage input end VIN end, the now gate source voltage Vgs=0 of described the first transistor T1, because described the first transistor T1 is that have when gate source voltage is zero can the power tube of characteristic of conducting, so described the first transistor T1 is in conducting state, therefore the energy inputing to power stage circuit 502 described in can be charged to described partially installing capacitor C by described the first transistor T1 and described first diode D1, now the output of described power supply circuits 501 exports a voltage to the feeder ear VCC of described control circuit 103, when this voltage reach described control circuit 103 start required minimum voltage (starting resistor) time, namely partially installing capacitor C provides starting resistor to control circuit 103, described control circuit 103 is made to start to start work, after this, the output of described power supply circuits 501 continues the supply power voltage normally worked for described control circuit 103 to the feeder ear VCC output voltage of described control circuit, described control circuit is when normally working, at the control end output pulse signal of its pulse signal output end Drv to described switching tube SR, with thus control described switching tube SR break-make, namely storage/exoergic the state of inductance in described power stage circuit 502 is controlled, thus by the inductance of described power stage circuit in 502 and the filter action of output capacitance, the input voltage of described input power is converted into stable output voltage powering load.
It should be noted that, in the Switching Power Supply shown in Fig. 5 or Fig. 6 or be applied in other Switching Power Supply of power supply circuits provided by the invention, the charging circuit of power supply circuits directly can also receive input voltage to described partially installing capacitor charging, think that control circuit provides starting resistor and supply power voltage, in this case, charging circuit is directly held with DC voltage input end VIN and is connected, to receive input voltage VIN, and main switch can be chosen as a high pressure resistant pipe, it can be directly connected to the connecting place of inductance and continued flow tube in power stage circuit, or main switch selects one to the less demanding switching tube of withstand voltage properties, it is connected to the connecting place of inductance and continued flow tube in power stage circuit by an extra high pressure resistant pipe.
In Switching Power Supply disclosed in visible the application Fig. 5 and Fig. 6, the supply power voltage needed when providing starting resistor for described control circuit and keep normal work all can be obtained by described power supply circuits, a start-up circuit need not be provided specially to provide starting resistor for described control circuit, therefore, without the need to using starting resistance, be conducive to the integrated of described switching power circuit circuit board, and reduce the production cost of described Switching Power Supply.And the switching tube in power stage circuit is connected with described DC voltage input end by the first transistor in described power supply circuits, make described the first transistor bears most voltage, and alleviate the high voltage born required on described switching tube, thus only require that described the first transistor is for can bear high-tension high-power tube in described switching tube and described the first transistor, and described switching tube can be chosen as the lower power tube of high voltage performance, thus reduce further the cost of manufacture of described Switching Power Supply.
Be understandable that; the equipment of the Switching Power Supply that any application the application provides is all within the protection range of the application; described equipment can be computer, display screen, display, air-conditioning etc., also specially discloses a kind of mobile phone applying Switching Power Supply disclosed in the present application to this application.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.Include term " connection " or " being connected " and directly or indirectly connect or be connected, and, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the power supply circuits of a Switching Power Supply, described Switching Power Supply comprises power stage circuit and control circuit, described control circuit output switch control signal, to control the on off state of main switch in described power stage circuit, it is characterized in that, described power supply circuits comprise partially installing capacitor and charging circuit, in order to provide starting resistor and supply power voltage to described control circuit
When input voltage inputs to the DC voltage input end of power stage circuit, described charging circuit receives described input voltage or inputs to the energy of described power stage circuit, charges to described partially installing capacitor, thinks that described control circuit provides starting resistor,
After described control circuit starts, described charging circuit continues the energy receiving described input voltage or input to described power stage circuit, charges, think that described control circuit provides supply power voltage to described partially installing capacitor.
2. power supply circuits according to claim 1, is characterized in that, described charging circuit receives the energy in described power stage circuit on inductance, charge to described partially installing capacitor, think that described control circuit provides starting resistor and supply power voltage.
3. power supply circuits according to claim 2, is characterized in that, described charging circuit comprises the first transistor and the first diode,
Wherein, the drain electrode end of described the first transistor receives the energy in described power stage circuit on inductance, and source terminal is connected with the anode of described first diode, and control end is by described partially installing capacitor ground connection;
The negative electrode of described first diode is by described partially installing capacitor ground connection;
Described the first transistor is that gate source voltage can the power tube of conducting when equalling zero.
4. power supply circuits according to claim 3, is characterized in that, the drain electrode end of described the first transistor is connected to the inductance of described power stage circuit and the connecting place of continued flow tube, and source terminal is by described main switch ground connection.
5. according to the power supply circuits in claim 4, it is characterized in that, described first diode cathode is connected with described partially installing capacitor by the first resistance.
6. according to the power supply circuits in claim 3, it is characterized in that, described the first transistor is N-type depletion MOS field-effect transistor.
7. according to the power supply circuits in claim 6, it is characterized in that, also comprise:
The voltage stabilizing didoe be connected in parallel with described partially installing capacitor.
8. according to the power supply circuits in claim 7, it is characterized in that, the puncture voltage of described voltage stabilizing didoe is the maximum supply power voltage that described control circuit can bear.
9. a Switching Power Supply, is characterized in that, comprises the power supply circuits described in claim 1-7 any one, the control circuit be connected with described power supply circuits, the power stage circuit be connected with described control circuit, wherein, described power supply circuits provide starting resistor and supply power voltage for described control circuit.
10. according to the Switching Power Supply in claim 9, it is characterized in that, described power stage circuit is booster type circuit or step-down 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 |
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| 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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| CN104779783A true CN104779783A (en) | 2015-07-15 |
| CN104779783B CN104779783B (en) | 2018-07-24 |
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| 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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| CN201410183966.3A Pending CN103929055A (en) | 2014-04-30 | 2014-04-30 | Power supply circuit and switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108880296A (en) * | 2018-06-12 | 2018-11-23 | 昂宝电子（上海）有限公司 | power conversion system |
| CN113541444A (en) * | 2020-04-15 | 2021-10-22 | 芯好半导体(成都)有限公司 | Current recovery circuit, switch converter and integrated circuit |
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| 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 |
| 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 |
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| JP2000175449A (en) * | 1998-12-07 | 2000-06-23 | Nec Eng Ltd | Switching power source circuit |
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| CN102355134A (en) * | 2011-09-23 | 2012-02-15 | 成都芯源***有限公司 | Switch conversion circuit and conversion method |
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| CN108880296A (en) * | 2018-06-12 | 2018-11-23 | 昂宝电子（上海）有限公司 | power conversion system |
| CN113541444A (en) * | 2020-04-15 | 2021-10-22 | 芯好半导体(成都)有限公司 | Current recovery circuit, switch converter and integrated circuit |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103929055A (en) | 2014-07-16 |
| CN104779783B (en) | 2018-07-24 |
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