CN107846140A - A kind of power supply circuit of accessory power supply - Google Patents
A kind of power supply circuit of accessory power supply Download PDFInfo
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- CN107846140A CN107846140A CN201610836158.1A CN201610836158A CN107846140A CN 107846140 A CN107846140 A CN 107846140A CN 201610836158 A CN201610836158 A CN 201610836158A CN 107846140 A CN107846140 A CN 107846140A
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- power supply
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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
Abstract
A kind of power supply circuit of accessory power supply, it can be determined to be powered the working condition of unit by control unit, and, in the startup stage for being powered unit, Continuity signal is inputted to switch element so that switching means conductive, the first source current are that boosting unit charging driving is powered unit by current limiting unit；After unit normal work is powered, pick-off signal is inputted to switch element, so that switch element disconnects, so as to reduce the loss of the soft starting circuit of accessory power supply on the basis of not influenceing Switching Power Supply and normally starting, the loss of current limiting unit especially in soft starting circuit, and then improve the power density and conversion efficiency of Switching Power Supply.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of power supply circuit of accessory power supply.
Background technology
General Switching Power Supply can all have an accessory power supply, for providing the functions such as control, protection, driving.Switching Power Supply
Startup, accessory power supply need to be started first, the power output of accessory power supply is all consumed, it is impossible to participate in energy transmission,
Therefore, accessory power supply directly affects the conversion efficiency of Switching Power Supply.
As shown in figure 1, the structure chart of the power supply circuit for accessory power supply, accessory power supply passes through soft starting circuit and switch electricity
The main circuit bus in source is connected, and by booting, power supply circuit is connected with main circuit output.During start, main circuit busbar voltage passes through
Start resistance R to charge for electric capacity C, when electric capacity C charges to the specified startup voltage of control chip, control chip starts；Control
After chip operation, its output pin starts to export pulsed drive power metal-oxide semiconductor field effect transistor
(Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), the main circuit of Switching Power Supply is defeated
Go out to start output and feedback voltage, control chip starts the power voltage supply exported by main circuit.That is, work as Switching Power Supply just
Often after work, the control chip of accessory power supply is powered without soft starting circuit to it, now the work(of soft starting circuit
Consumption may result in the waste of power, and then reduce the power density and conversion efficiency of Switching Power Supply.
The content of the invention
The embodiments of the invention provide a kind of power supply circuit of accessory power supply, to solve the power supply of existing accessory power supply
Circuit power consumption it is higher so as to cause the power density of Switching Power Supply and relatively low conversion ratio the problem of.
The embodiments of the invention provide a kind of power supply circuit of accessory power supply, including bootstrapping power supply circuit and soft start electricity
Road, wherein, unit normal work stage is being powered, main circuit output voltage is supplied by the bootstrapping power supply circuit to be described
Electric unit is powered；In the startup stage for being powered unit, the first source current passes through described in soft starting circuit driving
Unit is powered, the soft starting circuit includes control unit, switch element, current limiting unit and boosting unit, wherein：
Described control unit, for being powered the working condition of unit described in determination, and it is powered according to determination
The working condition of unit is to the switch element output control signal；Wherein, in the startup stage for being powered unit to institute
Switch element output Continuity signal is stated, and, cut in the unit normal work stage that is powered to switch element output
Stop signal；
The switch element, for being turned on when receiving the Continuity signal, and, when receiving the pick-off signal
When disconnect；
The current limiting unit, in the switching means conductive, limiting the electric current for flowing through the current limiting unit
Stream；
The boosting unit, for charging to the nominal drive electricity for being powered unit in the switching means conductive
Press, unit is powered described in driving.
The present invention has the beneficial effect that：
The power supply circuit of accessory power supply provided in an embodiment of the present invention, it can be determined to be powered the work of unit by control unit
State, and, in the startup stage for being powered unit, input Continuity signal to switch element so that switching means conductive, first
Source current is that boosting unit charging driving is powered unit by current limiting unit；After unit normal work is powered, to
Switch element inputs pick-off signal so that switch element disconnects, so as on the basis of not influenceing Switching Power Supply and normally starting
The loss of the loss, the especially current limiting unit in soft starting circuit of the soft starting circuit of accessory power supply is reduced, and then improves and opens
The power density and conversion efficiency in powered-down source.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing.
Fig. 1 show the structure chart of the power supply circuit of the accessory power supply of prior art；
Fig. 2 show the structure chart of the power supply circuit of accessory power supply provided in an embodiment of the present invention；
Fig. 3 show the detailed structure view of the power supply circuit of the accessory power supply of the offer of the embodiment of the present invention one；
Fig. 4 show the detailed structure view of the power supply circuit of the accessory power supply of the offer of the embodiment of the present invention two.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
The embodiments of the invention provide a kind of power supply circuit of accessory power supply, specifically, as shown in Fig. 2 it is the present invention
The structure chart of the power supply circuit of accessory power supply described in embodiment, including bootstrapping power supply circuit and soft starting circuit, wherein, in quilt
Power supply unit normal work stage, main circuit output voltage are powered by the bootstrapping power supply circuit for the unit that is powered；
In the startup stage for being powered unit, the first source current by the soft starting circuit drive described in be powered unit,
The soft starting circuit may include control unit 21, switch element 22, current limiting unit 23 and boosting unit 24, wherein：
Described control unit 21, for being powered the working condition of unit 25 described in determination, and according to the quilt of determination
The working condition of power supply unit 25 is to the output control signal of switch element 22；Wherein, it is powered opening for unit 25 described
The dynamic stage exports Continuity signal to the switch element 22, and, in the normal work stage of unit 25 that is powered to described
Switch element 22 exports pick-off signal；
The switch element 22, for being turned on when receiving the Continuity signal, and, believe when receiving the cut-off
Number when disconnect；
The current limiting unit 23, for when the switch element 22 turns on, the electric current to flowing through the current limiting unit 23
Carry out current limliting；
The boosting unit 24, described the specified of unit 25 is powered for being charged to when the switch element 22 turns on
Driving voltage, unit 25 is powered described in driving.
That is, the power supply circuit of accessory power supply provided in an embodiment of the present invention, can be determined to be powered by control unit
The working condition of unit, and, in the startup stage for being powered unit, input Continuity signal to switch element so that switch is single
Member conducting, the first source current are that boosting unit charging driving is powered unit by current limiting unit；It is normal being powered unit
After work, pick-off signal is inputted to switch element so that switch element disconnects, so as to normally open not influenceing Switching Power Supply
The loss of the loss, the especially current limiting unit in soft starting circuit of the soft starting circuit of accessory power supply is reduced on the basis of dynamic,
And then improve the power density and conversion efficiency of Switching Power Supply.
Alternatively, first power supply can be its of independent power supply or the Switching Power Supply where the accessory power supply
Its electric energy output end mouth, to realize that power supply mode is more flexible；Preferably, first power supply can be main circuit busbar, also
It is to say, in the startup stage for being powered unit 25, is driven using main circuit bus current by the soft starting circuit
Described to be powered unit 25, here is omitted.
Wherein, described control unit 21 may particularly include sampling unit 211 and execution unit 212, wherein：
The sampling unit 211, for being powered the working condition of unit 25 described in determination；And when it is determined that the quilt
When power supply unit 25 is in startup stage, the first signal is exported to the execution unit 212, when it is determined that described be powered unit 25
During in normal work stage, secondary signal is exported to the execution unit 212；
The execution unit 212, for when receiving first signal, conducting letter to be exported to the switch element 22
Number, and, when receiving the secondary signal, pick-off signal is exported to the switch element 22.
Alternatively, the sampling unit 211, can be specifically used for sampling the main circuit output voltage；And when
When the main circuit output voltage according to actual conditions less than magnitude of voltage (can flexibly the setting) set, it is determined that described be powered list
Member 25 is in startup stage, when the main circuit output voltage is not less than the magnitude of voltage of the setting, it is determined that described be powered
Unit 25 is in normal work stage.
Still optionally further, the sampling unit 211 can be by DSP (Digital Signal Processor, data signal
Processor) module realization, it can also be realized by sample circuit.When voltage of the voltage that the main circuit of Switching Power Supply exports less than setting
During value, then illustrate the also non-normal work of Switching Power Supply, the control signal that sampling unit 211 exports is the first signal；When switch electricity
When the voltage of the main circuit output in source is not less than the magnitude of voltage set, then illustrate Switching Power Supply normal work, sampling unit 211
The control signal of output is secondary signal, and here is omitted.
Alternatively, first signal is low level signal, and the secondary signal is high level signal；The Continuity signal
For high level signal, the pick-off signal is low level signal.Certainly, according to the difference of the specific implementation of circuit, also may be used
First signal is high level signal, and secondary signal is low level signal, or, Continuity signal is low level signal, pick-off signal
For high level signal, the present embodiment is not limited in any way herein.
Specifically, in the power supply circuit for the accessory power supply that the embodiment of the present invention shown in Fig. 2 is provided, current limiting unit 23
One end 2301 be the first supply terminals, the other end 2302 is connected with the first end 2201 of the switch element 22, described to open
The second end 2202 for closing unit 22 is connected with the first end 2401 of the boosting unit 24, the second end of the boosting unit 24
2402 are connected with the first end 2501 for being powered unit 25, the 3rd end 2403 of the boosting unit 24 and described are powered
Second end 2502 of unit 25 is terminals altogether；
The first end 2101 of described control unit 21 is main circuit output terminals, and the second end 2102 is second source wiring
End, the 3rd end 2103 are connected with the 3rd end 2203 of the switch element 22, and the 4th end 2104 is terminals altogether.
It should be noted that the second source is used to provide upper pull-up voltage for described control unit 21, it is alternatively, described
Second source can be other electric energy output end mouths of the Switching Power Supply where independent power supply or the accessory power supply, with reality
Existing power supply mode is more flexible；Preferably, to simplify circuit structure, the second source can be main circuit busbar, herein no longer
Repeat.
Alternatively, described control unit 21 may include sampling unit 211 and execution unit 212, wherein, the sampling unit
First end 2101 of 211 first end 2111 as described control unit 21, the second end 2112 and the first end of execution unit 212
2121 are connected；Second end 2102 of second end 2122 of the execution unit 212 as described control unit 21, the 3rd end 2123
As the 3rd end 2103 of described control unit 21, fourth end 2104 of the 4th end 2124 as described control unit 21.
Still optionally further, the execution unit 212 may include first resistor, second resistance, 3rd resistor, the first electricity
Appearance, the first NPN type triode and voltage-regulator diode, wherein：
First end 2121 of the one end of the first resistor as the execution unit 212；
One end of the other end of the first resistor and the second resistance, one end of first electric capacity and described
The first end of one NPN type triode is connected；
Second end 2122 of the one end of the 3rd resistor as the execution unit 212, the other end and the first NPN
Second end of type triode, the negative pole of the voltage-regulator diode are connected, and as the 3rd end 2123 of the execution unit 212；
The other end of the other end of the second resistance and first electric capacity, the 3rd of first NPN type triode the
The positive pole of end and the voltage-regulator diode is connected, and as the 4th end 2124 of the execution unit 212；
Wherein, the base stage of first NPN type triode be first NPN type triode first end, described first
Second end of extremely described first NPN type triode of the current collection of NPN type triode, the emitter stage of first NPN type triode
For the 3rd end of first NPN type triode.
Wherein, the boosting unit 24 may include diode and the second electric capacity, wherein：
First end 2401 of the positive pole of the diode as the boosting unit 24, negative pole and the one of second electric capacity
End is connected, and as the second end 2402 of the boosting unit 24；
Threeth end 2403 of the other end of second electric capacity as the boosting unit 24.
Alternatively, concretely transistor, the first end of the transistor are single as the switch for the switch element 22
The first end 2201 of member 22, the second end 2202 of the second end of the transistor as the switch element 22, the transistor
Threeth end 2203 of the 3rd end as the switch element 22.
Still optionally further, the transistor concretely electric power field-effect transistor, the electric power field-effect transistor
First end of the drain electrode as the transistor, the source electrode of the electric power field-effect transistor as the transistor second
End, the 3rd end of the grid of the electric power field-effect transistor as the transistor.
Still optionally further, the transistor can also be specifically the second NPN type triode, second NPN type triode
First end of the colelctor electrode as the transistor, the emitter stage of second NPN type triode as the transistor
Two ends, the 3rd end of the base stage of second NPN type triode as the transistor.
That is, each functional unit in the power supply circuit of the accessory power supply can use discrete component, therefore, institute
Stating power supply circuit also has the advantages of compatibility is high, cost is cheap.
Below for the different implementations of switch element, sampling unit, exemplified by being powered unit and be control chip, use
Above-mentioned power supply circuit is described in detail specific embodiment.
Embodiment one：
The embodiment of the present invention one provides a kind of power supply circuit of accessory power supply, including bootstrapping power supply circuit and soft start electricity
Road, wherein, unit normal work stage is being powered, main circuit output voltage is supplied by the bootstrapping power supply circuit to be described
Electric unit is powered；In the startup stage for being powered unit, the first source current passes through described in soft starting circuit driving
Unit is powered, the soft starting circuit includes control unit 21, switch element 22, current limiting unit 23 and boosting unit 24, its
In：
Described control unit 21, for being powered the working condition of unit 25 described in determination, and according to the quilt of determination
The working condition of power supply unit 25 is to the output control signal of switch element 22；Wherein, it is powered opening for unit 25 described
The dynamic stage exports Continuity signal to the switch element 22, and, in the normal work stage of unit 25 that is powered to described
Switch element 22 exports pick-off signal；
The switch element 22, for being turned on when receiving the Continuity signal, and, believe when receiving the cut-off
Number when disconnect；
The current limiting unit 23, for when the switch element 22 turns on, the electric current to flowing through the current limiting unit 23
Carry out current limliting；
The boosting unit 24, described the specified of unit 25 is powered for being charged to when the switch element 22 turns on
Driving voltage, unit 25 is powered described in driving.
The detailed construction of the power supply circuit for the accessory power supply that the embodiment of the present invention one provides is as shown in Figure 3.
It is control chip to be powered unit.
One end 2301 of current limiting unit 23 is the first supply terminals, the first of the other end 2302 and the switch element 22
End 2201 is connected, and the second end 2202 of the switch element 22 is connected with the first end 2401 of the boosting unit 24, the liter
Second end 2402 of pressure unit 24 is connected with the first end 2501 of control chip, the 3rd end 2403 of the boosting unit 24 and control
Second end 2502 of coremaking piece is terminals altogether；
The first end of described control unit 21 is main circuit output terminals, and the second end is second source terminals, the 3rd
End is connected with the 3rd end 2203 of the switch element 22, and the 4th end is terminals altogether.
Still optionally further, control unit 21 may include sampling unit and execution unit 212, wherein, the sampling unit
First end of the first end 2111 as described control unit 21, the second end 2112 and the phase of first end 2121 of execution unit 212
Even；Second end of second end 2122 of the execution unit 212 as described control unit 21, the 3rd end 2123 are used as the control
3rd end of unit 21 processed, fourth end of the 4th end 2124 as described control unit 21.Wherein, the sampling unit can be by
DSP module is realized (not shown in other terminals Fig. 3 of DSP module and control chip).
Execution unit 212 may include first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1, the first NPN
Type triode T1 and voltage-regulator diode D1, wherein：
First end 2121 of the one end of the first resistor R1 as the execution unit 212；
The other end of the first resistor R1 and the second resistance R2 one end, the first electric capacity C1 one end and
The first end of the first NPN type triode T1 is connected；
Second end 2122 of the one end of the 3rd resistor R3 as the execution unit 212, the other end and described first
NPN type triode T1 the second end, the negative pole of the voltage-regulator diode D1 are connected, and as the 3rd of the execution unit 212 the
End 2123；
The other end, the first NPN type triode T1 of the other end of the second resistance R2 and the first electric capacity C1
The 3rd end and the positive pole of the voltage-regulator diode D1 be connected, and as the 4th end 2124 of the execution unit 212；
Wherein, the base stage b of the first NPN type triode T1 is the first end of the first NPN type triode T1, described
First NPN type triode T1 colelctor electrode c be the first NPN type triode T1 the second end, first NPN type triode
T1 emitter e is the 3rd end of the first NPN type triode T1.
Wherein, the boosting unit 24 may include diode D2 and the second electric capacity C2, wherein：
First end 2401 of the positive pole of the diode D2 as the boosting unit 24, negative pole and the second electric capacity C2
One end be connected, and as the second end 2402 of the boosting unit 24；
Threeth end 2403 of the other end of the second electric capacity C2 as the boosting unit 24.
The switch element 22 concretely transistor, the first end of the transistor as the switch element 22
One end 2201, the second end 2202 of the second end of the transistor as the switch element 22, the 3rd end of the transistor
The 3rd end 2203 as the switch element 22.
Still optionally further, the transistor concretely electric power field-effect transistor Q1, the electric power field effect transistor
First ends of the pipe Q1 drain electrode d as the transistor, the source electrode s of the electric power field-effect transistor Q1 is as the transistor
The second end, the 3rd end of the grid g of the electric power field-effect transistor Q1 as the transistor.
Alternatively, first signal is low level signal, and the secondary signal is high level signal；The Continuity signal
For high level signal, the pick-off signal is low level signal.
In order to further illustrate the start-up circuit of the offer of the embodiment of the present invention one, its operation principle is explained in detail below
State.
When Switching Power Supply starts, DSP module detects magnitude of voltage of the voltage less than setting of main circuit output, output the
One signal low level signal, the first NPN type triode T1 shut-offs, the electricity between electric power field-effect transistor Q1 grid and source electrode
Press as high level, electric power field-effect transistor Q1 is in the conduction state, and the first source current passes through the (limit here of current limiting unit 23
Stream unit is resistance) it is after the second electric capacity C2 charges to the specified startup voltage of control chip, to drive the control chip；When opening
After powered-down source normal work, DSP module detects magnitude of voltage of the voltage not less than setting of main circuit output, the letter of output second
Number high level signal, the first NPN type triode T1 conductings, the voltage between electric power field-effect transistor Q1 grid and source electrode are
Low level, electric power field-effect transistor Q1 are in cut-off state, and control chip is passed through by the main circuit output voltage of Switching Power Supply
Power supply circuit of booting is powered.
In summary, the power supply circuit of accessory power supply provided in an embodiment of the present invention, can determine to be powered by control unit
The working condition of unit, and, in the startup stage for being powered unit, input Continuity signal to switch element so that switch is single
Member conducting, the first source current are that boosting unit charging driving is powered unit by current limiting unit；It is normal being powered unit
After work, pick-off signal is inputted to switch element so that switch element disconnects, so as to normally open not influenceing Switching Power Supply
The loss of the loss, the especially current limiting unit in soft starting circuit of the soft starting circuit of accessory power supply is reduced on the basis of dynamic,
And then improve the power density and conversion efficiency of Switching Power Supply.Further, since each functional unit in the power supply circuit
Using discrete component, therefore, also there is the advantages of compatibility is high, cost is cheap.
Embodiment two：
The embodiment of the present invention two provides a kind of power supply circuit of accessory power supply, including bootstrapping power supply circuit and soft start electricity
Road, wherein, unit normal work stage is being powered, main circuit output voltage is supplied by the bootstrapping power supply circuit to be described
Electric unit is powered；In the startup stage for being powered unit, the first source current passes through described in soft starting circuit driving
Unit is powered, the soft starting circuit includes control unit 21, switch element 22, current limiting unit 23 and boosting unit 24, its
In：
Described control unit 21, for being powered the working condition of unit 25 described in determination, and according to the quilt of determination
The working condition of power supply unit 25 is to the output control signal of switch element 22；Wherein, it is powered opening for unit 25 described
The dynamic stage exports Continuity signal to the switch element 22, and, in the normal work stage of unit 25 that is powered to described
Switch element 22 exports pick-off signal；
The switch element 22, for being turned on when receiving the Continuity signal, and, believe when receiving the cut-off
Number when disconnect；
The current limiting unit 23, for when the switch element 22 turns on, the electric current to flowing through the current limiting unit 23
Carry out current limliting；
The boosting unit 24, described the specified of unit 25 is powered for being charged to when the switch element 22 turns on
Driving voltage, unit 25 is powered described in driving.
The detailed construction of the power supply circuit for the accessory power supply that the embodiment of the present invention two provides is as shown in Figure 4.
It is control chip to be powered unit.
One end 2301 of current limiting unit 23 is the first supply terminals, the first of the other end 2302 and the switch element 22
End 2201 is connected, and the second end 2202 of the switch element 22 is connected with the first end 2401 of the boosting unit 24, the liter
Second end 2402 of pressure unit 24 is connected with the first end 2501 of control chip, the 3rd end 2403 of the boosting unit 24 and control
Second end 2502 of coremaking piece is terminals altogether；
The first end of described control unit 21 is main circuit output terminals, and the second end is second source terminals, the 3rd
End is connected with the 3rd end 2203 of the switch element 22, and the 4th end is terminals altogether.
Still optionally further, control unit 21 may include sampling unit and execution unit 212, wherein, the sampling unit
First end of the first end 2111 as described control unit 21, the second end 2112 and the phase of first end 2121 of execution unit 212
Even；Second end of second end 2122 of the execution unit 212 as described control unit 21, the 3rd end 2123 are used as the control
3rd end of unit 21 processed, fourth end of the 4th end 2124 as described control unit 21.Wherein, the sampling unit can be by adopting
Sample circuit realiration (particular circuit configurations of the sample circuit and other terminals Fig. 4 of control chip not shown in).
Execution unit 212 may include first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1, the first NPN
Type triode T1 and voltage-regulator diode D1, wherein：
First end 2121 of the one end of the first resistor R1 as the execution unit 212；
The other end of the first resistor R1 and the second resistance R2 one end, the first electric capacity C1 one end and
The first end of the first NPN type triode T1 is connected；
Second end 2122 of the one end of the 3rd resistor R3 as the execution unit 212, the other end and described first
NPN type triode T1 the second end, the negative pole of the voltage-regulator diode D1 are connected, and as the 3rd of the execution unit 212 the
End 2123；
The other end, the first NPN type triode T1 of the other end of the second resistance R2 and the first electric capacity C1
The 3rd end and the positive pole of the voltage-regulator diode D1 be connected, and as the 4th end 2124 of the execution unit 212；
Wherein, the base stage b of the first NPN type triode T1 is the first end of the first NPN type triode T1, described
First NPN type triode T1 colelctor electrode c be the first NPN type triode T1 the second end, first NPN type triode
T1 emitter e is the 3rd end of the first NPN type triode T1.
Wherein, the boosting unit 24 may include diode D2 and the second electric capacity C2, wherein：
First end 2401 of the positive pole of the diode D2 as the boosting unit 24, negative pole and the second electric capacity C2
One end be connected, and as the second end 2402 of the boosting unit 24；
Threeth end 2403 of the other end of the second electric capacity C2 as the boosting unit 24.
The switch element 22 concretely transistor, the first end of the transistor as the switch element 22
One end 2201, the second end 2202 of the second end of the transistor as the switch element 22, the 3rd end of the transistor
The 3rd end 2203 as the switch element 22.
The transistor concretely the second NPN type triode T2, the second NPN type triode T2 colelctor electrode c make
For the first end of the transistor, the second end of the emitter e of the second NPN type triode T2 as the transistor, institute
State the second NPN type triode T2 threeth ends of the base stage b as the transistor.
Alternatively, first signal is low level signal, and the secondary signal is high level signal；The Continuity signal
For high level signal, the pick-off signal is low level signal.
The operation principle for the start-up circuit that the embodiment of the present invention two provides is similar with above-described embodiment one, no longer superfluous herein
State.
In summary, the power supply circuit of accessory power supply provided in an embodiment of the present invention, can determine to be powered by control unit
The working condition of unit, and, in the startup stage for being powered unit, input Continuity signal to switch element so that switch is single
Member conducting, the first source current are that boosting unit charging driving is powered unit by current limiting unit；It is normal being powered unit
After work, pick-off signal is inputted to switch element so that switch element disconnects, so as to normally open not influenceing Switching Power Supply
The loss of the loss, the especially current limiting unit in soft starting circuit of the soft starting circuit of accessory power supply is reduced on the basis of dynamic,
And then improve the power density and conversion efficiency of Switching Power Supply.Further, since each functional unit in the power supply circuit
Using discrete component, therefore, also there is the advantages of compatibility is high, cost is cheap.
It should be noted that being not limited to the scheme that embodiment one, two is provided, the power supply circuit of the accessory power supply is opened
Other switching devices can also be used by closing unit, and the present embodiment is not intended to be limited in any herein.
In addition, any number of elements in drawing and description is used to example and unrestricted, and any name is all only
For distinguishing, without any restrictions implication.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, apparatus (equipment) or computer journey
Sequence product.Therefore, in terms of the present invention can use complete hardware embodiment, complete software embodiment or combine software and hardware
The form of embodiment.Moreover, the present invention can use the calculating for wherein including computer usable program code in one or more
The computer program that machine usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow chart with reference to method, apparatus (equipment) and computer program product according to embodiments of the present invention
And/or block diagram describes.It should be understood that can be by each flow in computer program instructions implementation process figure and/or block diagram
And/or square frame and the flow in flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided to refer to
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is made to produce
One machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for realizing
The device for the function of being specified in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of power supply circuit of accessory power supply, including bootstrapping power supply circuit and soft starting circuit, wherein, it is being powered unit just
Normal working stage, main circuit output voltage are powered by the bootstrapping power supply circuit for the unit that is powered；Supplied described
The startup stage of electric unit, the first source current described in soft starting circuit driving by being powered unit, it is characterised in that
The soft starting circuit includes control unit, switch element, current limiting unit and boosting unit, wherein：
Described control unit, for being powered the working condition of unit described in determination, and unit is powered according to determination
Working condition to the switch element output control signal；Wherein, opened in the startup stage for being powered unit to described
Unit output Continuity signal is closed, and, export cut-off letter to the switch element in the unit normal work stage that is powered
Number；
The switch element, for being turned on when receiving the Continuity signal, and, break when receiving the pick-off signal
Open；
The current limiting unit, in the switching means conductive, current limliting to be carried out to the electric current for flowing through the current limiting unit；
The boosting unit, for charging to the nominal operational voltage for being powered unit in the switching means conductive,
Unit is powered described in driving.
2. circuit as claimed in claim 1, it is characterised in that
One end of the current limiting unit is the first supply terminals, and the other end is connected with the first end of the switch element, described
Second end of switch element is connected with the first end of the boosting unit, and the second end of the boosting unit is powered list with described
The first end of member is connected, and the 3rd end of the boosting unit and second end for being powered unit are terminals altogether；
The first end of described control unit is main circuit output terminals, and the second end is second source terminals, the 3rd end and institute
The 3rd end for stating switch element is connected, and the 4th end is terminals altogether.
3. circuit as claimed in claim 1, it is characterised in that described control unit specifically includes sampling unit and performs list
Member, wherein：
The sampling unit, for being powered the working condition of unit described in determination；And when it is determined that described be powered at unit
When startup stage, the first signal is exported to the execution unit, when it is determined that the unit that is powered is in normal work stage
When, export secondary signal to the execution unit；
The execution unit, for when receiving first signal, Continuity signal to be exported to the switch element, and,
When receiving the secondary signal, pick-off signal is exported to the switch element.
4. circuit as claimed in claim 3, it is characterised in that
The sampling unit, specifically for being sampled to the main circuit output voltage；And when the main circuit exports electricity
Force down when the magnitude of voltage of setting, it is determined that the unit that is powered is in startup stage, when the main circuit output voltage is not low
When the magnitude of voltage of the setting, it is determined that the unit that is powered is in normal work stage.
5. circuit as claimed in claim 3, it is characterised in that
First signal is low level signal, and the secondary signal is high level signal；
The Continuity signal is high level signal, and the pick-off signal is low level signal.
6. circuit as claimed in claim 3, it is characterised in that
First end of the first end of the sampling unit as described control unit, the second end and the first end of the execution unit
It is connected；
Second end of second end of the execution unit as described control unit, the 3rd end as described control unit the 3rd
End, fourth end of the 4th end as described control unit.
7. circuit as claimed in claim 6, it is characterised in that the execution unit includes first resistor, second resistance, the 3rd
Resistance, the first electric capacity, the first NPN type triode and voltage-regulator diode, wherein：
First end of the one end of the first resistor as the execution unit；
One end of the other end of the first resistor and the second resistance, one end and described first of first electric capacity
The first end of NPN type triode is connected；
Second end of the one end of the 3rd resistor as the execution unit, the other end and first NPN type triode
Second end, the negative pole of the voltage-regulator diode are connected, and as the 3rd end of the execution unit；
The other end of the other end of the second resistance and first electric capacity, the 3rd end of first NPN type triode with
And the positive pole of the voltage-regulator diode is connected, and as the 4th end of the execution unit；
Wherein, the base stage of first NPN type triode be first NPN type triode first end, first NPN type
Second end of extremely described first NPN type triode of the current collection of triode, the transmitting of first NPN type triode are extremely described
3rd end of the first NPN type triode.
8. circuit as claimed in claim 1, it is characterised in that the boosting unit includes diode and the second electric capacity, wherein：
First end of the positive pole of the diode as the boosting unit, negative pole are connected with one end of second electric capacity, and
The second end as the boosting unit；
Threeth end of the other end of second electric capacity as the boosting unit.
9. circuit as claimed in claim 1, it is characterised in that the switch element is transistor, wherein：
First end of the first end of the transistor as the switch element, the second end of the transistor is as the switch
Second end of unit, the 3rd end of the 3rd end of the transistor as the switch element.
10. circuit as claimed in claim 9, it is characterised in that
The transistor is specially electric power field-effect transistor, and the drain electrode of the electric power field-effect transistor is as the transistor
First end, the second end of the source electrode of the electric power field-effect transistor as the transistor, the electric power field effect transistor
Threeth end of the grid of pipe as the transistor；Or,
The transistor is specially the second NPN type triode, and the colelctor electrode of second NPN type triode is as the transistor
First end, the second end of the emitter stage of second NPN type triode as the transistor, the pole of the second NPN type three
Threeth end of the base stage of pipe as the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610836158.1A CN107846140B (en) | 2016-09-20 | 2016-09-20 | Power supply circuit of auxiliary power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610836158.1A CN107846140B (en) | 2016-09-20 | 2016-09-20 | Power supply circuit of auxiliary power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107846140A true CN107846140A (en) | 2018-03-27 |
| CN107846140B CN107846140B (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610836158.1A Active CN107846140B (en) | 2016-09-20 | 2016-09-20 | Power supply circuit of auxiliary power supply |
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| CN (1) | CN107846140B (en) |
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| US20060087302A1 (en) * | 2001-08-22 | 2006-04-27 | Anadigics, Inc. | MMIC DC-to-DC converter |
| US20080106243A1 (en) * | 2006-10-31 | 2008-05-08 | Samsung Electro-Mechanics Co., Ltd. | Control circuit of dc-dc converter |
| CN101414748A (en) * | 2007-10-19 | 2009-04-22 | 深圳迈瑞生物医疗电子股份有限公司 | Method for starting control circuit and protecting power supply control chip |
| CN103475206A (en) * | 2013-09-23 | 2013-12-25 | 深圳科士达科技股份有限公司 | Starting circuit of PWM chip of wide-voltage auxiliary power source |
| CN204442165U (en) * | 2015-03-20 | 2015-07-01 | 北京益弘泰科技发展有限责任公司 | A kind of low power consumption switch power starting circuit |
| CN205142002U (en) * | 2015-09-30 | 2016-04-06 | 广州金升阳科技有限公司 | Switching power supply from supply circuit |
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2016
- 2016-09-20 CN CN201610836158.1A patent/CN107846140B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060087302A1 (en) * | 2001-08-22 | 2006-04-27 | Anadigics, Inc. | MMIC DC-to-DC converter |
| US20080106243A1 (en) * | 2006-10-31 | 2008-05-08 | Samsung Electro-Mechanics Co., Ltd. | Control circuit of dc-dc converter |
| CN101414748A (en) * | 2007-10-19 | 2009-04-22 | 深圳迈瑞生物医疗电子股份有限公司 | Method for starting control circuit and protecting power supply control chip |
| CN103475206A (en) * | 2013-09-23 | 2013-12-25 | 深圳科士达科技股份有限公司 | Starting circuit of PWM chip of wide-voltage auxiliary power source |
| CN204442165U (en) * | 2015-03-20 | 2015-07-01 | 北京益弘泰科技发展有限责任公司 | A kind of low power consumption switch power starting circuit |
| CN205142002U (en) * | 2015-09-30 | 2016-04-06 | 广州金升阳科技有限公司 | Switching power supply from supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107846140B (en) | 2020-07-28 |
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