CN104682688B - Power circuit - Google Patents
Power circuit Download PDFInfo
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- CN104682688B CN104682688B CN201510101731.XA CN201510101731A CN104682688B CN 104682688 B CN104682688 B CN 104682688B CN 201510101731 A CN201510101731 A CN 201510101731A CN 104682688 B CN104682688 B CN 104682688B
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- Prior art keywords
- conversion chip
- power conversion
- electric loading
- equations
- electricity consumption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of improve starting up when power supply stability method and power circuit, in the power supply control for two class electric loadings, and the starting current of first kind electric loading less than Equations of The Second Kind electric loading starting current；When needing to start two described class electric loading, control two-way power conversion chip is Equations of The Second Kind electricity consumption load supplying jointly first, control Equations of The Second Kind electric loading elder generation startup optimization, after Equations of The Second Kind electricity consumption load running is stable, control the first via power conversion chip in the two-way power conversion chip to stop to Equations of The Second Kind electricity consumption load supplying, then to first kind electricity consumption load supplying, to control first kind electric loading startup optimization.The present invention is controlled by the boot sequence of the two class electric loadings different to starting current, and two-way power conversion chip is controlled in the big use electric loading startup optimization of starting current for such electricity consumption load supplying, the load capacity of power circuit is thereby increased, the stability of power circuit is improve.
Description
Technical field
The invention belongs to power supply circuits technical field, specifically, is to be related to one kind starting shooting for improving electronic equipment
The method of supplying power to of power supply stability and circuit design during startup.
Background technology
In current a lot of electronic products, inside which, need integrated use electric loading more and more, and many electricity consumptions are negative
Supply voltage needed for carrying is not quite similar.In order to meet unequally loaded need for electricity, need to design multichannel in electronic product
DC-DC_1, DC-DC_2 in power conversion chip, such as Fig. 1, will be converted into multichannel difference amplitude by direct-current input power supplying VIN all the way
DC output power V1, V2, be different electricity consumption load supplyings, for example load LOAD1, LOAD2.
In the electronic product for being built-in with multiple power supplies conversion chip, due to the electricity consumption that different power conversion chips connects
Load is different, power conversion chip DC-DC_1 connections load LOAD1 in such as Fig. 1, power conversion chip DC-DC_2 connection loads
LOAD2.Illustrated as a example by loading LOAD2 when using electric loading than larger when having one in system, in load LOAD2
The moment of electrifying startup, one can be produced than larger starting current, this starting current can cause power conversion chip DC-
The out-put supply V2 of DC_2 fluctuates.When the power conversion chip DC-DC_2 out-put supply V2 fluctuation larger, beyond
During the voltage output range allowed by power conversion chip DC-DC_2, power conversion chip DC-DC_2 input sides will be caused
Direct-current input power supplying VIN changes.As direct-current input power supplying VIN is simultaneously as other power conversion chip DC-DC_ all the way
1 power supply, therefore, when there is fluctuation in direct-current input power supplying VIN, in addition power conversion chip DC-DC_1 conversions all the way
The DC output power V1 of output will produce fluctuation, so as to affect which to the normal power supply for loading LOAD1, can cause to bear when serious
Carry LOAD1 cannot normal work, have influence on then the normal operation of whole system.
Content of the invention
It is an object of the invention to provide a kind of method and circuit design for improving power supply stability during starting up,
To solve, the supply voltage that causes because starting current is excessive in heavy load startup optimization of existing power supply circuit is unstable to ask
Topic.
For solving above-mentioned technical problem, the present invention is employed the following technical solutions and is achieved：
A kind of method for improving power supply stability during starting up, in the power supply control for two class electric loadings,
And the starting current of first kind electric loading is less than the starting current of Equations of The Second Kind electric loading；Needing to start described two classes use
During electric loading, control two-way power conversion chip is Equations of The Second Kind electricity consumption load supplying jointly first, controls Equations of The Second Kind electric loading
First startup optimization, after Equations of The Second Kind electricity consumption load running is stable, controls the first via power supply in the two-way power conversion chip
Conversion chip stops to Equations of The Second Kind electricity consumption load supplying, then to first kind electricity consumption load supplying, is born with controlling first kind electricity consumption
Carry startup optimization.
Further, when the Equations of The Second Kind is controlled with electric loading startup optimization, Equations of The Second Kind electric loading institute is first according to
The supply voltage for needing adjusts the output voltage of the first via power conversion chip；Then, bear in the control first kind electricity consumption
When carrying startup optimization, according to the output that the supply voltage needed for first kind electric loading adjusts the first via power conversion chip
Voltage；The output voltage of the second road power conversion chip is fixed according to the supply voltage needed for Equations of The Second Kind electric loading matches somebody with somebody
Put.
Preferably, described two-way power conversion chip is received with input power all the way.
Based on the above-mentioned method for improving power supply stability during starting up, the invention allows for a kind of be used for improving
The power circuit of power supply stability during starting up, for for two different class electricity consumption load supplyings of starting current, including first
Road power conversion chip and the second road power conversion chip；When needing to start two described class electric loading, the first via
Power conversion chip and the second road power conversion chip are powered jointly to the big Equations of The Second Kind electric loading of starting current first, control
Equations of The Second Kind electricity consumption loads first startup optimization, after Equations of The Second Kind electricity consumption load running is stable, the first via power conversion chip
Stop to Equations of The Second Kind electricity consumption load supplying, then to the little first kind electricity consumption load supplying of starting current, control first kind electricity consumption
It is supported on rear startup optimization.
Further, the first via power conversion chip exports Equations of The Second Kind when Equations of The Second Kind is with electric loading startup optimization
Supply voltage needed for electric loading；When the first kind is with electric loading startup optimization, the confession needed for first kind electric loading is exported
Piezoelectric voltage；Second road power conversion chip keeps the supply voltage needed for output Equations of The Second Kind electric loading, is continuously second
Class electricity consumption load supplying, it is ensured that Equations of The Second Kind electricity consumption load can continue normal operation upon actuation.
In order to adjust the amplitude of the supply voltage exported by first via power conversion chip, to meet difference electric loading
Power demands, the first via power conversion chip according to the feedback voltage level that its feedback end is received adjust its export confession
Piezoelectric voltage, the feedback end connect the outfan of first via power conversion chip by the adjustable bleeder circuit of a resistance, pass through
Change is connected to the divider resistance regulation of the feedback end and transmits to the magnitude of voltage of the feedback end.
Used as a kind of preferred electrical architecture design of the bleeder circuit, the present invention is provided with two in the bleeder circuit
Individual switch element and three divider resistances, wherein, the second divider resistance be connected to the outfan of first via power conversion chip with
Between feedback end, the feedback end of the first via power conversion chip leads up to the switch ways connection the of first switch element
One divider resistance, and be grounded by the first divider resistance, the switch ways for separately leading up to second switch element connect the 3rd point
Piezoresistance, and be grounded by the 3rd divider resistance；The control end of the first switch element receives first and enables signal, and second opens
The control end for closing element receives the 3rd enable signal.
In order to ensure that the supply current exported by two-way power conversion chip can be passed exactly to two class electric loadings
Defeated, when the supply voltage needed for the first kind electric loading is less than the supply voltage needed for Equations of The Second Kind electric loading, design
The outfan of the first via power conversion chip connects the output of the second road power conversion chip by an anti-back biased diode
End；The first via power conversion chip is matched somebody with somebody when being Equations of The Second Kind electricity consumption load supplying with the second road power conversion chip jointly
Put the supply voltage V=V2+Va+V of the first via power conversion chip outputD；Wherein, V2 is the second road power conversion chip
The supply voltage of output；Va is the permission undulating value of the output voltage of the second road power conversion chip；VDIt is described anti-reverse-biased two
The conduction voltage drop of pole pipe, to ensure two-way power conversion chip in Equations of The Second Kind electric loading startup optimization, can be the simultaneously
Two class electricity consumption load supplyings.When the first via power conversion chip is first kind electricity consumption load supplying, first via power supply turns
Change the supply voltage V≤V2-Va+V of chip outputD, to avoid the output voltage of the second road power conversion chip to first via electricity
The supply voltage V of source conversion chip output causes clamped impact, affects then the normal operation of first kind electric loading.
In order to be controlled to the working condition of two-way power conversion chip in order, the present invention is set in the power circuit
Put the control circuit that the control first via power conversion chip and the second road power conversion chip enable operation, the control
Circuit generates the first enable signal when first kind electric loading needs startup optimization, is transmitted to first by a switching diode
The Enable Pin of road power conversion chip, generates second and enables signal transmission to the when Equations of The Second Kind electric loading needs startup optimization
The Enable Pin of two road power conversion chips；The second enable signal is in Equations of The Second Kind electric loading from starting to the stable phase
In transmit to first via power conversion chip, control first via power conversion chip enables operation, is Equations of The Second Kind electric loading
Power supply.
Further, the second enable signal is transmitted under the gating control of first switch circuit and is turned to first via power supply
Change the Enable Pin of chip, the control circuit Equations of The Second Kind electric loading from start to stable in a period of output effectively
3rd enables signal, controls the Enable Pin that the first switch circuit communication second enables signal and first via power conversion chip
Between signal transmission pathway.
Used as a kind of preferred electrical architecture design of the first switch circuit, the present invention is in the first switch circuit
A NPN type triode and a PMOS is provided with, the source electrode of the PMOS receives the second described enable signal, drain electrode connection
The Enable Pin of first via power conversion chip, the grid of the PMOS connect the source of the PMOS by a configuration resistance
Pole, and be connected with the colelctor electrode of the NPN type triode, the grounded emitter of the NPN type triode, base stage receive described
The 3rd enable signal.
In order to be controlled with the startup optimization of electric loading exactly to the first kind, the first via Power convert core
The outfan of piece connects first kind electric loading by second switch circuit, and the second switch circuit receives the control circuit
First enable signal of output, when the described first enable signal is effective, connection first via power conversion chip is used with the first kind
Current supply circuit between electric loading, is first kind electricity consumption load supplying.
Used as a kind of preferred electrical architecture design of the second switch circuit, the present invention is in the second switch circuit
It is provided with another NPN type triode and another PMOS, the source electrode connection first via power conversion chip of another PMOS
Outfan, drain electrode connection first kind electric loading, source electrode of the grid by another configuration resistance connection another PMOS,
And be connected with the colelctor electrode of another NPN type triode, the grounded emitter of another NPN type triode, base stage connect
Receive the first described enable signal.
Compared with prior art, advantages of the present invention and good effect are：The present invention is by different to starting current two
The startup optimization order of class electric loading is controlled, and the control two-way electricity in starting current big use electric loading startup optimization
Source conversion chip is such electricity consumption load supplying simultaneously, it is possible thereby to increase the load capacity of power circuit, prevents because of load
Starting current fluctuates larger and causes the voltage pulsation of the outlet side of power conversion chip to exceed what power conversion chip was allowed
Voltage output range, avoids power circuit then when heavy load starts, the supply voltage caused because starting current is excessive
Unstable phenomenon, improves the stability of power circuit and the reliability of load running.
After the detailed description of embodiment of the present invention is read in conjunction with the accompanying, the other features and advantages of the invention will become more
Plus it is clear.
Description of the drawings
Fig. 1 is a kind of circuit theory diagrams of embodiment of existing power supply circuit；
Fig. 2 is a kind of circuit theory diagrams of embodiment of power circuit proposed by the invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in more detail.
The present embodiment in order to solve existing power supply circuit in system boot because some with electric loading starting current larger and
Affect the problem of power supply output stability, it is proposed that a kind of brand-new method of supplying power to and circuit design, opened with improving system boot
The stability of power supply output when dynamic.
First the design philosophy of the power supply method for controlling power supply of the present embodiment is specifically addressed.
The power supply method for controlling power supply of the present embodiment is supported on start mainly for two different class electricity consumptions of starting current and opens
Powerup issue when dynamic and propose.For two class electric loadings, the present embodiment design two-way power conversion chip is two class institutes
The electricity consumption load supplying that states.Assume the starting current of the starting current less than Equations of The Second Kind electric loading of first kind electric loading,
When needing to start two described class electric loading, in order to improve the stability of power supply during starting up, the present embodiment is controlled first
Two-way power conversion chip is the Equations of The Second Kind electricity consumption load supplying that starting current is big jointly, and control Equations of The Second Kind electric loading first starts
Operation.As the current fluctuation scope that two-way power conversion chip can bear is much larger than the outlet side of power conversion chip all the way
Current carrying capability, therefore, even Equations of The Second Kind electric loading starting current fluctuation larger, which is in two-way Power convert core
The voltage output range also allowed without departing from power conversion chip by voltage pulsation peak value caused by the outlet side of piece, thus
The input power for being connected to the power conversion chip will not be impacted, improve then the stability of power circuit.
After described Equations of The Second Kind electricity consumption load running is stable, the first via electricity in the two-way power conversion chip is controlled
Source conversion chip stops to Equations of The Second Kind electricity consumption load supplying, then to first kind electricity consumption load supplying, to control first kind electricity consumption
Load startup optimization.As the starting current fluctuation of first kind electric loading is less, which is defeated first via power conversion chip
Go out the voltage output range allowed by the voltage pulsation for causing side without departing from first via power conversion chip, therefore in the first kind
During with electric loading startup optimization, also the input power for connecting first via power conversion chip will not be impacted, thus just may be used
Ensure stability of the whole system power supply when starting up is loaded.
In the present embodiment, described two-way power conversion chip can connect with input power all the way, by described
Input power carries out the conversion of voltage magnitude, to generate the supply voltage needed for two class electric loadings, is that two classes are supplied with electric loading
Electricity.
In the present embodiment, the supply voltage needed for two described class electric loadings can be the same or different, every
One can only be included in one class electric loading and use electric loading, it is also possible to be born including the difference electricity consumption of multiple supply voltage identicals
Carry.When the supply voltage needed for two described class electric loadings is different, when Equations of The Second Kind is controlled with electric loading startup optimization, need
Supply voltage needed for Equations of The Second Kind electric loading to be first according to adjusts the output voltage of the first via power conversion chip, makes
The voltage exported by first via power conversion chip meets the power demands of Equations of The Second Kind electric loading.Then, treat that Equations of The Second Kind is used
After electric loading is stable, the first via power conversion chip is adjusted according to the supply voltage needed for first kind electric loading
Output voltage, makes the voltage exported by first via power conversion chip meet the power demands of first kind electric loading, then
Control first kind electric loading startup optimization.Now, the supply voltage needed for Equations of The Second Kind electric loading is only turned by the second road power supply
Chip offer is provided, keeps the operation of Equations of The Second Kind electricity consumption load continuous.Due to the electricity by the second road power conversion chip conversion output
Pressure is only used for as Equations of The Second Kind electricity consumption load supplying, therefore can be in advance according to the supply voltage needed for Equations of The Second Kind electric loading to the
The output voltage of two road power conversion chips is fixed configuration.
Above-mentioned design philosophy is based on, the present embodiment proposes power circuit design as shown in Figure 2.
In Fig. 2, U1 is first via power conversion chip, and U2 is the second road power conversion chip, and described two-way power supply turns
Change chip U1, U2 to receive with direct-current input power supplying VIN all the way by its input IN, electric capacity CIN1, CIN2 are used for described
Direct-current input power supplying VIN is filtered process, to improve the direct-current input power supplying for being input to two-way power conversion chip U1, U2
The stability of VIN.
The anode that the outfan OUT of first via power conversion chip U1 is connected an anti-back biased diode D2, will be anti-reverse-biased
The negative electrode of diode D2 is connected to the outfan OUT of the second road power conversion chip U2, the second road power conversion chip U2
Outfan OUT connection Equations of The Second Kind electric loading LOAD2, the supply voltage V2 for needed for providing which with electric loading LOAD2.In order to
The working condition of two-way power conversion chip U1, U2 is controlled, the present embodiment generates three tunnels by a control circuit and enables
Signal EN1, EN2, EN3, realize that the enable to two-way power conversion chip U1, U2 is controlled.In the present embodiment, the control electricity
Road can be built using discrete device, it is also possible to directly simplify electricity using integrated chips such as MCU, CPU as controller
Design on road.The present embodiment preferably generates described enable signal EN1, EN2, EN3 using MCU, the enable signal EN1,
EN2, EN3 can be the on-off models of high/low level.
Exported by MCU first enable signal EN1 is transmitted to first via Power convert core by switching diode D1
Enable Pin EN of piece U1, for when needing to control the operation of first kind electric loading LOAD1, controlling first via power conversion chip
U1 enables operation.Exported by MCU second enable signal EN2 is transmitted to the Enable Pin of the second road power conversion chip U2
EN, for when needing to control the operation of Equations of The Second Kind electric loading LOAD2, the second road of control power conversion chip U2 enables operation.
It is Equations of The Second Kind together in order to two-way power conversion chip U1, U2 when Equations of The Second Kind is with electric loading LOAD2 startup optimization, can be controlled
Powered with electric loading LOAD2.Described second enable signal EN2 is simultaneously transmit to first switch circuit by the present embodiment, and is utilized
3rd enable signal EN3 control first switch circuits of MCU outputs are stable from starting in Equations of The Second Kind electric loading LOAD2
In a period of turn on, to connect the signal between the second enable signal EN2 and Enable Pin EN of first via power conversion chip U1
Transmission channel, enables signal EN2 control first via power conversion chip U1 in Equations of The Second Kind electric loading LOAD2 using second then
Power for Equations of The Second Kind electric loading LOAD2 during startup optimization.
Used as a kind of preferred design of the present embodiment, the first switch circuit can be matched somebody with somebody using PMOS Q5
Unification NPN type triode Q6 is formed by connecting, as shown in Figure 2.By the source electrode connection MCU of PMOS Q5, MCU outputs are received
Second enable signal EN2, and by configure resistance R4 connect PMOS Q5 grid.The drain electrode of PMOS Q5 is connected
To Enable Pin EN of first via power conversion chip U1, grid connects the colelctor electrode of NPN type triode Q6.The NPN type
The grounded emitter of audion Q6, base stage receive the 3rd enable signal EN3 of MCU outputs.
Due to two classes with electric loading LOAD1, LOAD2 needed for supply voltage may be different, in the present embodiment, described the
Supply voltage V1 of one class needed for electric loading LOAD1 is less than supply voltage V2 of the Equations of The Second Kind needed for electric loading LOAD2, therefore
In order to meet the power demands of two class electric loadings LOAD1, LOAD2, the electricity exported by first via power conversion chip U1 is needed
Pressure is adjusted.For this purpose, the present embodiment connects the adjustable partial pressure of a resistance in the feedback end FB of first via power conversion chip U1
Circuit, by changing the divider resistance for being connected to the feedback end FB come the output voltage of regulation power supply conversion chip U1.
Used as a kind of preferred electrical architecture design of the bleeder circuit, the present embodiment is provided with the bleeder circuit
Two switch elements Q1, Q2 and three divider resistances R1, R2, R5, as shown in Figure 2.Wherein, described two switch element Q1,
Q2 can select the components and parts with on-off action such as NPN type triode, metal-oxide-semiconductor or controllable silicon to carry out circuit design, this reality
Apply example to illustrate by taking NPN type triode as an example.The colelctor electrode of two NPN type triodes Q1, Q2 is respectively connecting to the first via
The feedback end FB of power conversion chip U1, and the output of first via power conversion chip U1 is connected to by the second divider resistance R2
End OUT.By NPN type triode Q1（First switch element）Emitter stage by series connection the first divider resistance R1 ground connection, NPN type
The base stage of audion Q1 receives the first described enable signal EN1.By NPN type triode Q2（Second switch element）Emitter stage
By the 3rd divider resistance R5 ground connection that connects, the base stage of NPN type triode Q2 receives the 3rd described enable signal EN3.
After system boot, input power VIN sets up, and is transmitted separately to first via power conversion chip U1 and second
The input IN of road power conversion chip U2, is that two-way power conversion chip U1, U2 power.Can using the input power VIN
Think that MCU powers, MCU is started and is entered steady operational status.After MCU stable operations, the first invalid enable signal is exported
EN1（Such as low level）Signal EN2 and the 3rd is enabled with effective second and enables signal EN3（Such as high level）.Now, due to
Second enables signal EN2 for high level, and therefore the second road power conversion chip U2 enables operation, is connected to the second tunnel by configuring
The resistance of divider resistance R7, R6 of the feedback end FB and outfan OUT of power conversion chip U2, can control the second road power supply and turn
Change supply voltage V2 of the output voltage of chip U2 for needed for Equations of The Second Kind electric loading LOAD2.Simultaneously as the 3rd enables signal
EN3 is high level, therefore NPN type triode saturation conduction, drags down the grid potential of PMOS Q5, and control PMOS Q5 saturation is led
Logical, make the second of high level to enable signal EN2 and transmit to Enable Pin EN of first via power conversion chip U1, control first via electricity
Source conversion chip U1 enables operation.Now, as first enables signal EN1 and be low level, the 3rd enable signal EN3 for high electricity
Flat, therefore audion Q1 cut-offs, audion Q2 saturation conductions are linked into the feedback end FB's of first via power conversion chip U1
Divider resistance is R2 and R5, by reasonably configuring the resistance of divider resistance R2 and R5, makes by first via power conversion chip
The supply voltage V=V2+Va+V of U1 outputsD；Wherein, V2 is the supply voltage of the second road power conversion chip U2 outputs；Va is
The permission undulating value of the output voltage of two road power conversion chip U2；VDIt is the conduction voltage drop of the anti-back biased diode D2.By
This can ensure that two-way power conversion chip U1, U2 in Equations of The Second Kind electric loading LOAD2 startup optimization, can be second simultaneously
Class electric loading LOAD2 is powered, it is achieved that when Equations of The Second Kind electric loading LOAD2 starts by two-way power conversion chip be simultaneously
The purpose that heavy load is powered, enhances the load capacity of power supply, it is ensured that supply voltage V2 is loading stablizing when LOAD2 starts
Property.
After Equations of The Second Kind is stable with electric loading LOAD2, MCU puts the first enable signal EN1 and second and enables signal EN2
For effective status（Such as high level）, it is disarmed state that juxtaposition the 3rd enables signal EN3（Such as low level）.Now, the second tunnel
Power conversion chip U2 keeps enabling running status, continues as Equations of The Second Kind electric loading LOAD2 and powers, it is ensured that Equations of The Second Kind electricity consumption is born
Carry LOAD2 continuous services.At the same time, as the 3rd enables signal EN3 for low level, end audion Q6, PMOS Q5
Off state is proceeded to as its grid voltage is equal to its source voltage, so that the second enable signal EN2 is cut off to first via electricity
The transmission of source conversion chip U1, the second enable signal EN2 now are only used for controlling the second road power conversion chip U2 enable fortune
OK.After Equations of The Second Kind is stable with electric loading LOAD2, the running status of first via power conversion chip U1 is enabled by first to be believed
Number EN1 control, i.e. the first enable signal EN1 of MCU output high level are transmitted to first via power supply turn by switching diode D1
Enable Pin EN of chip U1 is changed, control first via power conversion chip U1 is in Equations of The Second Kind with electric loading LOAD2 startup optimization to surely
Operation is enabled after determining state, is that first kind electric loading LOAD1 is powered.Now, due to first enable signal EN1 be high level,
3rd enables signal EN3 for low level, and the audion Q1 for being connected thus to the feedback end FB of first via power conversion chip U1 satisfies
And conducting, audion Q2 cut-offs, that is, the divider resistance for being linked into the feedback end FB of first via power conversion chip U1 are R2 and R1,
By reasonably configuring the resistance of divider resistance R2 and R1, the supply voltage V=exported by first via power conversion chip U1 is made
V1, to meet the power demands of first kind electric loading LOAD1, controls first kind electric loading LOAD1 startup optimization.In this reality
Apply in example, PMOS Q3 that conducting resistance should be adopted as far as possible little, to reduce the conduction voltage drop in PMOS Q3.As the first kind is used
The starting current fluctuation of electric loading LOAD1 is less, without departing from the tolerance range of power conversion chip U1, therefore will not be to power supply
The output of circuit is impacted, it is ensured that the stability of power circuit output voltage.
When first via power conversion chip U1 powers for first kind electric loading LOAD1, the first via power supply is limited
Supply voltage V≤the V2-Va+V of conversion chip U1 outputsD.Because once there is ripple in the voltage of the second road power supply chip U2 outputs
When dynamic, minimum is V2-Va, if the then supply voltage V of first via power conversion chip U1 outputs>V2-Va+VD, then the second tunnel
The confession that the output voltage of power conversion chip U2 will be exported to first via power conversion chip U1 by anti-back biased diode D2
Piezoelectric voltage V-arrangement is into a clamper, it is possible to influence whether the normal work of first kind electric loading LOAD1.So, in order to ensure
Normal operation of the first kind with electric loading LOAD1, the output voltage of first via power conversion chip U1 are less than equal to V2-Va+
VD, and power demands of the first kind with electric loading LOAD1 simultaneously.
In order to ensure first via power conversion chip U1 for Equations of The Second Kind electricity consumption load supplying when, its output voltage will not be arrived
Up to first kind electric loading LOAD1, possible overtension is avoided then to cause damage first kind electric loading LOAD1, this
Embodiment is also associated with second between the outfan OUT of first via power conversion chip U1 and first kind electric loading LOAD1
On-off circuit, as shown in Figure 2.The second switch connecting and disconnecting of the circuit is controlled using the first enable signal EN1 that MCU is exported, to protect
Card is in the output voltage V=V1 of first via power conversion chip U1, then transmits to first kind electric loading LOAD1, is the first kind
Powered with electric loading LOAD1.
Used as a kind of preferred design of the present embodiment, the second switch circuit can adopt NPN type triode Q4
PMOS Q3 is coordinated to be formed by connecting.As shown in Fig. 2 by the source electrode connection first via power conversion chip U1's of PMOS Q3
Outfan OUT, and connect the grid of PMOS Q3 by configuring resistance R3.The drain electrode connection first kind of PMOS Q3 is used
Electric loading LOAD1, grid connect the colelctor electrode of NPN type triode Q4.The grounded emitter of NPN type triode Q4,
Base stage receives the first enable signal EN1 of MCU outputs.
In a period of Equations of The Second Kind is with electric loading LOAD2 startup optimization, due to the first enable signal exported by MCU
EN1 is low level, therefore the cut-off of NPN type triode Q4, and PMOS Q3 is turned off as its grid potential is equal to its source potential,
Avoid the voltage exported by first via power conversion chip U1 from transmitting to first kind electric loading LOAD1, realize to load
The protection of LOAD1.After MCU controls Equations of The Second Kind electric loading LOAD2 startup optimization for a period of time（The time can be according to negative
Carry LOAD2 and determine from the even running actually required time is started to）, MCU puts the first enable signal EN1 for high level, and the 3rd
It is low level to enable signal EN3.Now, NPN type triode Q4 enters saturation conduction state, drags down the grid electricity of PMOS Q3
Position, controls PMOS Q3 saturation conduction, makes the voltage exported by first via power conversion chip U1 be sent to first kind electricity consumption
Load LOAD1, the supply voltage V1 for needed for providing which with electric loading LOAD1, the control first kind start fortune with electric loading LOAD1
OK.
Certainly, the second switch circuit can also be opened using other in addition to NPN type triode Q4 and PMOS Q3
Close element design realize, such as PNP type triode, NMOS tube or controllable silicon, relay etc., the present embodiment be not limited in
Upper citing.
Supply voltage V1, the V2 exported by two-way power conversion chip U1, U2 can further by being connected to power supply
Filter capacitor COUT1, COUT2 of circuit output side be filtered process after, be resent to two class electric loadings LOAD1,
LOAD2, further to improve the stability of load supplying.
In the present embodiment, described two-way power conversion chip U1, U2 can adopt DC-DC conversion chips, it is also possible to
The specific design that power circuit is carried out using LDO voltage stabilizer, the present embodiment do not carry out concrete restriction to this.
The application Power Management Design scheme that proposed of the present embodiment, can avoid than larger load starting current on startup
The excessive and phenomenon of voltage instability that causes, enhances the stability of power circuit.The power circuit is applied and is set in acoustics
In the electronic products such as standby, video playback apparatus, the stability and reliability of electronic product operation can be improved.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, and this technology is led
Change, remodeling, interpolation or replacement that the those of ordinary skill in domain is made in the essential scope of the present invention, should also belong to this
Bright protection domain.
Claims (5)
1. a kind of power circuit, for for two different class electricity consumption load supplyings of starting current, including first via Power convert core
Piece and the second road power conversion chip, it is characterised in that：When needing to start two described class electric loading, the first via electricity
Source conversion chip and the second road power conversion chip are powered jointly to the big Equations of The Second Kind electric loading of starting current first, control the
Two class electricity consumptions load first startup optimization, and after Equations of The Second Kind electricity consumption load running is stable, the first via power conversion chip stops
Only to Equations of The Second Kind electricity consumption load supplying, then to the little first kind electricity consumption load supplying of starting current, the electricity consumption of the control first kind is born
It is loaded in rear startup optimization；
The first via power conversion chip is exported needed for Equations of The Second Kind electric loading when Equations of The Second Kind is with electric loading startup optimization
Supply voltage；When the first kind is with electric loading startup optimization, the supply voltage needed for first kind electric loading is exported；Described second
Road power conversion chip keeps the supply voltage needed for output Equations of The Second Kind electric loading, is continuously Equations of The Second Kind electricity consumption load supplying；
Supply voltage needed for the first kind electric loading less than the supply voltage needed for Equations of The Second Kind electric loading, described first
The outfan of road power conversion chip connects the outfan of the second road power conversion chip by an anti-back biased diode；
The first via power conversion chip when being Equations of The Second Kind electricity consumption load supplying with the second road power conversion chip jointly, the
The supply voltage V=V2+Va+V that power conversion chip is exported all the wayD；
Wherein, V2 is the supply voltage of the second road power conversion chip output；Va is the output electricity of the second road power conversion chip
The permission undulating value of pressure；VD is the conduction voltage drop of the anti-back biased diode；
When the first via power conversion chip is first kind electricity consumption load supplying, the confession of first via power conversion chip output
Piezoelectric voltage V≤V2-Va+VD.
2. power circuit according to claim 1, it is characterised in that：The first via power conversion chip is fed back according to which
The feedback voltage level that termination is received adjusts the supply voltage which exports, and the feedback end is connected by the adjustable bleeder circuit of a resistance
The outfan of first via power conversion chip is connect, is transmitted to described by changing the divider resistance for being connected to the feedback end and adjusting
The magnitude of voltage of feedback end.
3. power circuit according to claim 1 and 2, it is characterised in that：A control is provided with the power circuit
The first via power conversion chip and the second road power conversion chip enable the control circuit of operation, and the control circuit is the
One class electric loading needs to generate the first enable signal during startup optimization, is transmitted by a switching diode and is turned to first via power supply
The Enable Pin of chip is changed, and second is generated when Equations of The Second Kind electric loading needs startup optimization and enables signal transmission to the second road power supply
The Enable Pin of conversion chip；Described second enable signal Equations of The Second Kind electric loading from start to stable in a period of transmit
To first via power conversion chip, control first via power conversion chip enables operation, is Equations of The Second Kind electricity consumption load supplying.
4. power circuit according to claim 3, it is characterised in that：Described second enables signal in first switch circuit
Transmit to the Enable Pin of first via power conversion chip under gating control, the control circuit is in Equations of The Second Kind electric loading from startup
Enable signal to the effective 3rd is exported in a period of stable, control the first switch circuit communication second and enable signal
And the signal transmission pathway between the Enable Pin of first via power conversion chip.
5. power circuit according to claim 3, it is characterised in that：The outfan of the first via power conversion chip leads to
Second switch circuit connection first kind electric loading is crossed, the second switch circuit receives the first of the control circuit output and makes
Energy signal, when the described first enable signal is effective, between connection first via power conversion chip and first kind electric loading
Current supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510101731.XA CN104682688B (en) | 2015-03-09 | 2015-03-09 | Power circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510101731.XA CN104682688B (en) | 2015-03-09 | 2015-03-09 | Power circuit |
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| CN104682688A CN104682688A (en) | 2015-06-03 |
| CN104682688B true CN104682688B (en) | 2017-03-15 |
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| CN106655748B (en) * | 2015-11-02 | 2019-06-07 | 中国船舶重工集团公司第七二三研究所 | A kind of the power-up logic and protection circuit of two-way output DC power supply |
| CN106230235B (en) * | 2016-08-09 | 2019-06-04 | 惠州市德赛西威汽车电子股份有限公司 | A kind of circuit for eliminating abrupt voltage wave |
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| CN1221078C (en) * | 2003-09-25 | 2005-09-28 | 联想(北京)有限公司 | Surge current preventing and time sequence controlling device and method for thermal connect-disceonnect electronic equipment |
| JP5023731B2 (en) * | 2007-02-16 | 2012-09-12 | 富士通セミコンダクター株式会社 | Power supply circuit, power supply control circuit, and power supply control method |
| CN101727080B (en) * | 2008-10-31 | 2011-06-22 | 华为技术有限公司 | Method, device and system for power input control |
| CN101567572A (en) * | 2009-02-19 | 2009-10-28 | 北京航空航天大学 | Mobile robot power supply |
| CN102195271B (en) * | 2010-03-10 | 2016-01-20 | 深圳市朗科科技股份有限公司 | For reducing the device of starting current of electronic equipment |
| CN204442175U (en) * | 2015-03-09 | 2015-07-01 | 青岛歌尔声学科技有限公司 | A kind of power circuit and there is the electronic product of described power circuit |
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